Patent Grant
9039251
This disclosure generally relates to lighting, light fixtures and lenses.
There is a continuing need for low cost systems that can improve the light quality of light fixtures.
According to various implementations of the disclosed technology, a light emitting device may be provided. The light emitting device may comprise an enclosure that comprises a back surface, four sides, a top edge surface associated with each of the four sides, and an opening defined by the four sides. The top edge surfaces may be disposed adjacent to the opening. The enclosure may be capable of mounting on a grid frame of a suspended ceiling such that a portion of the top edge surface of at least two of the four sides contacts a portion of the grid frame. The light emitting device may further comprise a light modifying element capable of modifying light from a light source. The light modifying element may be characterized by a substrate with four or more edges, a light-receiving back surface disposed on the entirety of, or a portion of the top edge surface of each of the four sides of the enclosure, and a light-emitting front surface. All or a portion of a periphery of the light-emitting front surface may be capable of contacting, or being disposed in close proximity to the grid frame after the light emitting device is mounted to the grid frame.
According to various implementations of the disclosed technology, a substrate attachment system may be provided. The substrate attachment system may comprise a substrate having a first surface configured with at least one supporting edge truss configured from a corresponding fold in the substrate. The fold may be adjacent to a least one edge of the substrate, wherein the at least one supporting edge truss may be configured at an angle relative to the first surface, and wherein the at least one supporting edge truss may include an outer perimeter edge. The example embodiment of a substrate attachment system may further comprise at least one elongated frame member with a cross section comprising at least two segments, wherein the at least two segments may define at least a first surface and an adjacent second surface. The adjacent second surface may further comprise an edge truss retention feature. The substrate may be capable of being attached to the at least one elongated frame member such that the first surface of the substrate may be disposed on the first surface of the at least two frame segments, and the outer perimeter edge of the edge truss may be engaged by the edge truss retention feature on the adjacent second surface of the at least two frame segments.
According to various implementations of the disclosed technology, a film tensioning system may be provided. The film tensioning system may comprise at least one film piece defining a film plane, and may be characterized by at least one supporting edge truss on two or more opposing edges of the at least one film piece. Each supporting edge truss may be configured from a corresponding fold in the at least one film piece, wherein each supporting edge truss is further configured to assist in the support of the at least one film piece in a substantially planar configuration. The film tensioning system may further comprise a frame comprising at least one film attachment surface on each of two opposing sides of the frame, wherein the film attachment surface may be oriented at an angle relative to the film plane. At least one film tensioning device may engage both a supporting edge truss of the at least one film piece and the at least one film attachment surface of one side of the frame. Another at least one film tensioning device may engage both the opposing supporting edge truss of the at least one film piece and the at least one film attachment surface of the opposing side of the frame. Each film tensioning device may be configured to pull a corresponding supporting edge truss and a film attachment surface closer together to impart tension within the at least one film piece.
According to various implementations of the disclosed technology, a lens assembly may be provided. The lens assembly may comprise an elongated structure comprising at least two opposing attachment features, wherein each of the at least two opposing attachment features may comprise at least a first surface and an adjacent second surface, and wherein the adjacent second surface may further comprise an edge truss retention feature. The lens assembly may further comprise at least one optical film piece defining an aperture plane and may have a first surface configured with at least one supporting edge truss on at least two opposing edges of the optical film piece. The at least one supporting edge truss may be configured from a corresponding fold in the at least one optical film piece, wherein the fold may be adjacent to at least one edge of the at least one optical film piece. The at least one supporting edge truss may be configured at an angle relative to the aperture plane, wherein each supporting edge truss may include an outer perimeter edge. At least one optical film piece may be capable of attachment to the elongated frame member such that a portion of the first surface of the optical film piece may be disposed on the first surfaces of the at least two opposing attachment features, and the outer perimeter edge of each opposing supporting edge truss may be capable of engaging with the corresponding edge truss retention feature wherein the aperture plane may form a curve.
As LED light fixtures become more commonplace in the market and prices decline, manufacturers may seek to cut manufacturing costs to increase profits etc. The largest single cost in a light fixture may be the LED light source. LED strips may be a lower cost alternative to that of LED panel arrays, and therefore more economical. LED strips may typically be commercially available in approximate 11′ or 22′ lengths, and may typically have one or two rows of LEDs on each strip. There term “LED array” will herein be referred to as one or more elongated LED strips, wherein each LED strip comprises one or more rows of LEDs. When LED arrays are used as the light source, the pinpoint high intensity light from the LEDs may create a significant problem with respect to having the individual LEDs visible through a light fixture lens, often referred to as “pixelization”. In addition, excessively bright areas in the vicinity of the LED arrays, and uneven or visually unpleasing light distribution within the light fixture and across the lens may be evident. If LED arrays are mounted flat on the back surface of the light fixture and facing the lens, there may be only a 3″ to 3½″ light source to lens distance in a typical “troffer” light fixture. Accordingly, there may be little that can be done within that distance in order to distribute the light evenly or acceptably within the fixture or across the lens, while retaining reasonable fixture efficiency.
If two LED arrays were center mounted in a fixture as indicated by numeral 3 in
Example embodiments may utilize LED array mounting features configured from metal extrusions to retain linear LED arrays in their required orientations. Metal extrusions may be advantageous due to their low cost.
Example embodiments of LED array mounting features may also comprise profiles similar to those described that utilize extrusions, but utilize folded sheet metal as an alternative. The functionality of example embodiments utilizing folded sheet metal may be very similar to that of extruded example embodiments; the choice of which fabrication method may primarily be based on cost and convenience considerations.
Example embodiments of LED array mounting features have been described as comprising metal. However, example embodiments may also comprise other materials that may have suitable mechanical and thermally conductive properties, just as plastics, composites, or polymers.
In an example embodiment, LED arrays may mount directly on a reflector panel that also functions as a heat sink to dissipate the heat generated by the LED arrays, that may have a lower manufacturing and assembly cost compared to utilizing extrusions as described. Referring to
In an example embodiment, a reflector panel with integral LED array mounting flange may be utilized wherein the panel may have a curved shape already formed into the panel during a manufacturing process such as stamping or extruding.
Example embodiments of light fixtures described may comprise alternate LED mounting angles between vertical and horizontal which may function suitably with a given lens configuration.
In an example implementation of light fixture similar to that as previously described and shown in
Example embodiments of light fixtures with alternate LED mounting angles as described may be utilized with any mounting features as described. For example, extrusions may be created with LED mounting surfaces configured with the desired alternate LED mounting angles.
In an example embodiment as shown in
Example embodiments with back-to-back LED array configurations as described may also be configured in light fixtures without curved reflectors therein, as previously described. For example,
Referring to
In an example embodiment, the single LME or two LME sections may be fabricated by any suitable method, such as injection molding, vacuum forming or extrusion methods for example. An example embodiment of LME may be fabricated with its final shape as shown by the LME 10 in
In example embodiments wherein an LME has enough flexibility such that sufficient access to the inside of the light fixture can be obtained, the LME may be fastened to the LED array mounting features. In an example embodiment as shown in
Example embodiments of LME may be fabricated with a flat flexible substrate as shown in
The example embodiment just described depicts the LME sections 10 being retained in their compressed curved state by enclosure lip flanges 1B. However, any mechanical means may be utilized to retain the shape of the LME sections that may be cost effective and visually acceptable. For example, fasteners, clips, detachable extrusions, folds in the enclosure sheet metal etc. may be utilized. For example, the requirement to have the LME removable once the fixture is installed may dictate the preferred mechanical means of retention of the LME sections 10.
Trim strip 9 may be utilized as an important visual aesthetic feature in the center between each LME 10 as a decorative trim and to hide the joint between each LME 10 section. Perhaps most importantly, the trim strip 9 may be configured with the appropriate size to hide or eliminate the dead zone.
Still referring to
Another feature of an example embodiment as shown in
An example embodiment of lenses with one or more refraction features may now be described. An example embodiment of lens may comprise a substrate defining a plane of incidence and having a first surface. The substrate may comprise a uniform transmittance region and at least one refraction feature pattern or shape region adjacent to the uniform transmittance region and defining a refraction feature pattern or shape region. A refraction feature pattern or shape region may comprise at least one refraction element, and the at least one refraction element may comprise, one or more of:
a height variation of the first surface;
a thickness variation of the substrate;
a refractive index variation of the first surface;
a refractive index variation of the substrate; and
a coating in contact with the first surface.
The at least one refraction element of the at least one refraction feature pattern or shape region may be configured to alter a transmittance angle of at least a portion of light input to the lens at an incidence angle with respect to the plane of incidence.
A refraction feature pattern or shape region may comprise any shape or pattern, for example, a square, a circle, a grouping of parallel linear elements, a rectangle, a shape comprising a gradient, etc. The shape or pattern on a lens, and may be configured to modify light from a light fixture in a more efficient manner than with just the lens, or to create a more visually pleasing light output. For example, the shape or pattern may function to lower pixelization and increase lamp hiding on an LED light fixture. For example, the pattern or shape may function to create a region of higher density diffusion particles disposed over top of an LED light source. The shape or pattern may be also be configured to add a visual aesthetic or an ornamental design feature to an example embodiment of lens. Refraction elements may be formed onto any type of lens, including lenses comprising a clear or translucent substrate that may be either rigid or semi-rigid, or lenses comprising optical film.
Refraction elements may be formed on an example embodiment of lens on either the front or back lens surface, or on both surfaces. They may comprise protuberances or grooves on a lens surface with any type of cross-sectional profile that may enable a desired light refraction characteristic, for example, prismatic, Fresnel, curves etc., that may be formed or molded into the substrate. Refraction elements may comprise variations in a surface configuration of the lens. For example, a lens with a surface coating, for example a diffusion coating, may not have the coating applied to the surface areas of the refraction features. Alternatively the refraction features may have an additional coating applied to those areas. Surface variations as described may be created by etching, printing, or any other method that may achieve suitable characteristics. For example, a lens formed utilizing an injection molding process may have refraction elements formed by different textures created in corresponding areas of the mold cavities. Refraction elements may comprise areas of a lens surface that may have ink or diffusion elements applied utilizing printing techniques or methods such as an inkjet or laser printer for example. Refraction features may be created by a computer-controlled laser that may etch lines, patterns, textures or shapes onto a lens surface, whereby creating a surface texture or depth in those areas that may be different from the rest of the lens surface. Lenses may have one or more optical film overlays wherein the refraction features may be formed on the one or more optical film overlays. Lenses may have one or more optical film overlays wherein the refraction features may comprise only the optical film overlays. On optical film lenses, refraction elements may be laser etched, scored, printed, heated, stamped, embossed etc. on an optical film surface. For example, a stamping die may create score lines or a textured pattern area on a film surface.
Any refraction elements described may also be configured to be opaque or semi-opaque.
An example embodiment of lens with refraction features that may be applied by one or more methods as described may be shown in
In an example embodiment, metallic or white particles may be printed on any surface of a lens with an inkjet printer. For example, a large format printer such as the VersaCAMM VSI series by the Roland Corp. may be configured to print highly reflective silver metallic ink as well as white ink. Solid or gradient refraction features as previously described may be able to be printed in any combination of white and silver. The density of printed refraction features may be varied to obtain the required lamp hiding, diffusion, and luminaire efficiency. Additionally, silver or opalescent colors may function to add a unique aesthetic quality to an example embodiment of lens.
The pattern may be etched onto the lens surface with a laser beam or created in an injection molding process as described.
An example embodiment of lens with refraction features that may be applied by one or more methods as described may be shown in
An example embodiment of lens with refraction features that may be applied by one or more methods as described may be shown in
In the example embodiment shown in
In example embodiments wherein the refraction elements may comprise grooves or protuberances, thin elongated linear shapes may be utilized that may function to increase lamp hiding and to add an appealing visual aesthetic. The refraction features may be oriented parallel to an LED arrays or linear light source, wherein direct light from the linear light source may strike the sides of the refraction elements, which may create more pronounced refraction of the light source. Any other groupings or orientations of linear refraction lines may be utilized that may add the desired visual aesthetics and photometric properties.
In an example embodiment as shown in
As recited in the “Related Applications” section, this application is a continuation-in-part of PCT Patent Application PCT/US2013/039895 entitled “Frameless Light Modifying Element” filed May 7, 2013, and is also a continuation-in-part of PCT Patent Application PCT/US2013/059919 entitled “Frameless Light Modifying Element” filed Sep. 16, 2013. As described, various example embodiments of self-supporting optical film lenses were included which incorporate “edge trusses” on two or more edges of an optical film piece. Each edge truss may include one or more sides configured from a corresponding fold in the optical film, wherein at least one of the one or more sides is configured at an angle relative to the lens plane to impart support to the lens and to resist deflection of each edge truss. In example embodiments, edge trusses may impart sufficient structural rigidity to pieces of optical film to support portions of the optical film in a substantially planar configuration.
Referring to
In an example embodiment as shown in
When the example embodiment of LME is folded and configured similarly to that shown in
Each mounting section 30 of each LME 10 may be placed together along with an optional center trim piece 9 as previously described, and a suitable fastener such as nut and bolt set 31 may be installed through holes 7A configured in the LME mounting sections (also shown by holes 7A on
Alternatively, a pin arrangement may be utilized as a fastener, wherein the pins may snap into reciprocal female mounting slots on the LED array mounting features, thereby allowing the LME assembly to be easily attached and removed from the light fixture. Example embodiments of optical film LMEs may also attach to example embodiments of light fixture by any other method previous described, such as those described for LMEs comprising clear or translucent, rigid or semi-rigid substrates.
Referring to
Refraction elements 11 may be configured onto the optical film, as shown in
Referring to
In an example embodiment as disclosed, no doorframe may be required to support the LME, which may offer significant manufacturing cost savings. There may be many possible methods of attachment of example embodiments of the disclosed technology to any given light fixture, as well as LME dimensions and configurations that may vary depending on the light fixture configuration, the intended application etc. Although a particular method of attachment and general LME size and edge truss configuration has been described with respect to a particular light fixture, this should not in any way limit the general scope of example embodiments.
Example embodiments of optical film LMEs may be attached to light fixtures with magnets, hook and loop fasteners, adhesives, clips, extrusions, springs, or any other method which may be suitable for the application. Protuberances such as rivets, clips etc. may be installed on edge trusses of example embodiments wherein the protuberances may attach to corresponding areas of a light fixture, securing an example embodiment to a light fixture. Example embodiments of LMEs may also mount in a light fixture doorframe without any fasteners. Example embodiments of optical film LMEs may nest in channels formed into a light fixture enclosure. In example embodiments of optical film LMEs, once the LMEs are attached to the LED mounting flanges, the LMEs may subsequently be laterally compressed, and the LME edges may be inserted under two enclosure lip flanges 1B as shown in
In example implementations, the LME(s) may be comprised of diffusion film with light condensing properties as previously described in related applications, or comprised of any kind of light condensing film. Generally, light condensing optical film may direct a portion of light refracting through it more towards the direction of the normal of its surface. Because of this, a greater portion of refracted light may be directed outwards towards the direction of the surface normals than would have otherwise if the LME were comprised of non-light condensing optical film. Accordingly, in the example embodiment of LME as shown in
Referring to
The example implementation as shown in
Example embodiments of LME and example embodiments of light fixtures with LMEs that comprise a curved section and a planar section as described may also comprise LMEs that have much larger curved section and smaller or non-existent planar sections as shown in
In an example implementation, the light fixture without the LME attached as shown in
Referring to
At lamp to lens depths of 3″ to 3½″ as may be typical of commercially available troffer light fixtures, if a flat diffusion lens utilizing the same low diffusion material were used, high pixelization may occur in the vicinity of the LEDs from various viewing angles, the problem area between the lines X and Y may be objectionably bright, and the dead zone directly above the two LED arrays may be visibly objectionable.
The light reflection, refraction and TIR principles of diffusion materials previously described, along with the optical properties of bi planar lenses described in a related application may be utilized to help correct the problems as described. Again referring to
Lens planes 22 may form an inverted bi-planar lens. With the appropriate diffusion material with light condensing properties, and the appropriate angles of lens planes 22 relative to the light fixture aperture plane as indicated by the dotted line FAP, pixelization may be eliminated, and the light intensity in the problem area between lines X and Y may be significantly reduced. The chosen angles of lens planes 22 may need consideration however. As their angles relative to the line FAP are increased, forward brightness may be decreased. However, assuming the intersection points between lens planes 21 and 22 remain fixed, the distance of lens planes 22 to the LED arrays 3 may be simultaneously decreased. Pixelization may be evident if the angles of lens planes 22 are increased too much. Accordingly, a harmonious balance may need to be obtained, perhaps through trial and error. Lens planes 22 may function to create a discrete visual partition of homogenous brightness, which may be visually appealing. In summary, lens planes 22 and 23 may function to turn the disadvantages of the problem area and the dead zone as described into visually striking LME features. In other words, turning that frown upside down .
Prism film strips 13 may be optionally utilized to lower brightness in the problem area as previously described. However, due to low diffusion materials utilized in the LME, unwanted specular reflections on the reflector panels 4 may occur. The size and placement of the prism film strips may need to be modified if said reflections occur, or the prism strips may need to be eliminated altogether.
Angled lens planes 21 may function as previously described, and may have sufficient distance from the LED arrays 3 to achieve acceptably even illumination and no pixelization. In alternate example embodiments, the lens planes 21 may be substantially parallel to line FAP. Luminaire efficiency may decrease somewhat compared to angled lens planes 21 as described.
Another feature of an example embodiment is shown in
Referring to
Similar to previous example embodiments of optical film LMEs, linear refraction features 11 as shown in
Referring to
In an example implementation, the light fixture without the LME attached as shown in
Referring to
In an example embodiment as disclosed, no doorframe may be required to support the LME, which may offer significant manufacturing cost savings. There may be many possible methods of attachment of example embodiments of the disclosed technology to any given light fixture, as well as LME dimensions and configurations which may vary depending on the light fixture configuration, the intended application etc. Although a particular method of attachment and general LME size and edge truss configuration has been described with respect to a particular light fixture, this should not in any way limit the general scope of example embodiments. For example, example embodiments of LME may be attached to doorframes. Example embodiments of LME may nest in a doorframe. Example embodiments of LME may nest in a channels formed into a light fixture enclosure.
Example embodiments of the disclosed technology may be attached to light fixtures or light fixture doorframes with magnets, hook and loop fasteners, adhesives, clips, extrusions, springs, or any other method that may be suitable for the application. Protuberances such as rivets, clips etc. may be installed on edge trusses of example embodiments wherein the protuberances may attach to corresponding areas of a light fixture, securing an example embodiment to a light fixture. Example embodiments of lenses may also mount in a light fixture doorframe without any fasteners.
Referring to
Certain example embodiments of lenses described in this patent application may have been described being associated with, or utilized in conjunction with certain example embodiments of light fixture. This should not however, limit the scope of possible applications that example embodiments of lenses may be used in. Example embodiments of lenses described herein may be utilized with any suitable configuration of light fixture or light emitting device.
When linear LED arrays are used as a light source for a light fixture such as a troffer as previously described, and the LED arrays are mounted on the back surface of the fixture facing the lens, the pinpoint high intensity light from the LEDs may create a significant problem with respect to having excessively bright strips in the vicinity of the LED arrays, and uneven or visually unpleasing light distribution within the light fixture and across the lens. Typically in such a configuration that may utilize a high diffusion flat lens, although pixilation may be eliminated, the lens may still exhibit a bright, relatively thin strip above where the LED arrays are located, and relatively uneven light distribution within the fixture and across the lens. This may create visually unpleasing shadows, especially when viewed from off-axis. This may create an unimpressive and cheap visual impression to viewers. Some or all of these problems may be addressed by example embodiments that may herein be described.
An example embodiment of multi-plane LME with optical film inserts may be shown in
In an example embodiment, the LME 10 may include two raised sections 31, wherein the raised sections 31 may each be substantially centered over LED arrays 3. Referring to FIG. 13B that depicts a side profile view of an example embodiment, the LME 10 may have two raised sections 31 with sides 30B which may form an acute angle relative to the plane defined by the surface of the raised section 31, which may create slots 34. Flat strips of optical film 30 may be configured of an appropriate dimension greater than the width of the raised sections 31 such that when the two opposing major edges are squeezed together and inserted into opposing slots 34, the optical film strips 30 may form a curved shape as shown. The structured surface of the optical film insert 35 is shown facing the LME raised sections 31. The optical film strips 30 may comprise any optical film which may have suitable optical characteristics for an intended application. Two examples may now be described.
The optical filmstrips 30 may comprise prismatic optical film. The structured surface of the prismatic film may preferably be oriented with its structured surface 35 (
When an example embodiment is configured as shown in
The degree of curvature of an optical film strip may be adjusted to optimize light reflection and refraction distribution to suit a given light fixture configuration. Generally, a relatively shallow curve as shown in
In example embodiment as shown in
In an example embodiment, an important visual element may be refraction elements 11 as shown in
An optical film scoring and cutting template for the example embodiment shown in
Example embodiments of LME that include raised sections as described may also be used without an optical film strip. The degree of uniformity of illumination in the LME raised sections as well as inside the light fixture interior may be lower; however, the overall visual results may be acceptable for many applications. Luminaire efficiency may increase as a result, and manufacturing costs may be lower. A degree of the picture box effect as described may still be evident, and if linear refraction features are included, this may increase the apparent illumination uniformity of the raised sections.
An example embodiment may also comprise a flat sheet lens with no raised sections as shown in
In an example embodiment as shown in
Refraction features in any of the example embodiments herein described may be included to increase visual and aesthetic appeal as well as create increased lamp hiding as previously described. Accordingly, inclusion or omission of refraction features or elements, or the specific pattern of any refraction features or elements may be optional or may vary, and the scope of example embodiments should not be limited in any way if refraction features or elements are omitted or modified from those described.
Example implementations have been described that may include LED arrays. However, the scope of possible light sources that may be utilized with example embodiments of the disclosed technology should not be limited in any way, and may include any light source which may be practical which includes, but is not limited to, alternate LED array configurations.
In an example embodiment, a light fixture may comprise an enclosure with four or more sides, an enclosure back surface defining a back surface plane of the enclosure, a center axis that is equidistant and parallel to two of the four or more sides, and an aperture plane defined by outermost edges of the four or more sides. Two or more linear light emitting diode (LED) arrays may be configured to mount within the enclosure, wherein each linear LED array may comprise one or more linear LED strips comprising one or more rows of LEDs. Each LED array may comprise a front light emitting side, and a backside opposite of the front light emitting side. In an example implementation, one or more LED array mounting features may be configured to dissipate heat generated from linear LED arrays, wherein each LED array mounting feature may comprising at least two front elongated planar surfaces configured for attaching to two or more linear LED arrays. In an example embodiment, the one or more LED array mounting features may be disposed parallel and in proximity to the center axis of the enclosure back surface, and each of the at least two front elongated planar surfaces of the one or more linear LED array mounting features may face two opposite sides of the enclosure, and may be oriented at an angle between about 80 degrees and about 135 degrees relative to the back surface plane of the enclosure.
In an example embodiment, each LED array mounting feature may comprise an integral curved light reflecting panel that may include a thermally conductive material with a reflecting surface configured to reflect light. The elongated planar surface may comprises a flange formed along one edge of the reflector panel configured to mount at least one linear LED array.
In an example embodiment, an LED array mounting feature may comprise an integral flat, flexible light reflecting panel that may include a thermally conductive material defining a reflecting surface configured to reflect light. The flexible flat light reflecting panel may form a curved reflecting surface when laterally compressed and installed in a light fixture enclosure. Each LED array mounting feature may comprise an elongated planar surface comprising a flange formed along one edge of the reflector panel configured to mount at least one linear LED array.
In an example embodiment, an LED array mounting feature may comprise a thermally conductive extrusion that includes at least two elongated planar coaxial ribs, wherein an angle between the elongated planar coaxial ribs is between about 80 and about 135 degrees. A first one of the at least two elongated planar coaxial ribs may be configured to mount to an enclosure back surface, and wherein at least one linear LED array may be configured to mount to a second one of the at least two elongated planar coaxial ribs.
In an example embodiment, an LED array mounting feature may comprise a single metal extrusion that includes at least two side ribs and a bottom rib, wherein the at least two side ribs comprise a front elongated planar surface that forms an angle of between about 80 degrees and about 135 degrees with respect to the bottom rib. The bottom rib may be configured to mount on the back surface of an enclosure, and wherein at least one linear LED array may be configured to mount on the front elongated planar surface of each of the at least two side ribs.
In an example embodiment, a lens may comprise a clear or translucent substrate. The clear or translucent substrate may comprise any polymer, glass or optical film, and may be configured to modify light from linear LED arrays. The lens may further comprise two lens halves defining opposing, substantially planar outer portions and curved inner portions; the planar outer portions including outer edges that may be disposed in proximity to opposing edges of an aperture plane of an enclosure, and the outer edges of the two lens halves may be substantially parallel to one other. An axis of symmetry may define the two lens halves, wherein the two lens halves may be substantially similar to one another, and wherein the two lens halves may be configured to intersect or join in proximity to the axis of symmetry. The axis of symmetry may be disposed above, or in proximity to one or more LED array mounting features.
In an example embodiment, a lens may comprise one or more pieces of optical film and may be configured to modify light from linear LED arrays. The lens may further comprise two lens halves defining opposing, substantially planar outer portions and curved inner portions; the planar outer portions including outer edges that may be disposed in proximity to opposing edges of an aperture plane of an enclosure, and the outer edges of the two lens halves may be substantially parallel to one other. An axis of symmetry may define the two lens halves, wherein the two lens halves may be substantially similar to one another, and wherein the two lens halves may be configured to intersect or join in proximity to the axis of symmetry. The axis of symmetry may be disposed above, or in proximity to one or more LED array mounting features. The one or more pieces of optical film may comprise one or more edge trusses, wherein each of the one or more edge trusses may include one or more sides configured from a corresponding fold in the one or more pieces of optical film. At least one of the one or more sides of the one or more edge trusses may be configured at an angle relative to a front light-emitting side of the lens to impart support to the lens and to resist deflection of each edge truss.
In an example embodiment, a lens may comprise a clear or translucent substrate. The clear or translucent substrate may comprise any polymer, glass or optical film, and may be configured to modify light from linear LED arrays. The lens may further comprise two lens halves defining opposing, substantially planar outer portions and curved inner portions; the planar outer portions including outer edges that may be disposed in proximity to opposing edges of an aperture plane of an enclosure, and the outer edges of the two lens halves may be substantially parallel to one other. An axis of symmetry may define the two lens halves, wherein the two lens halves may be substantially similar to one another, and wherein the two lens halves may be configured to intersect or join in proximity to the axis of symmetry. The axis of symmetry may be disposed above, or in proximity to one or more LED array mounting features. The lens may further define a plane of incidence and a first surface, and at least one refraction feature pattern or shape region defining a feature pattern or shape region comprising at least one refraction element. The at least one refraction element may comprise, as applicable, one or more of:
A height variation of the first surface;
A thickness variation of the substrate;
A refractive index variation of the first surface;
A refractive index variation of the substrate;
A coating in contact with the first surface.
The at least one refraction element of the at least one refraction feature pattern or shape region may be configured to alter a transmittance angle of at least a portion of light input to the lens at an incidence angle with respect to the plane of incidence.
In an example embodiment, a lens may comprise a clear or translucent substrate. The clear or translucent substrate may comprise any polymer, glass or optical film, and may be configured to modify light from linear LED arrays. The lens may further comprise two lens halves defining opposing, substantially curved portions, including outer edges that may be disposed in proximity to opposing edges of an aperture plane of an enclosure, and the outer edges of the two lens halves may be substantially parallel to one other. An axis of symmetry may define the two lens halves, wherein the two lens halves may be substantially similar to one another, and wherein the two lens halves may be configured to intersect or join in proximity to the axis of symmetry. The axis of symmetry may be disposed above, or in proximity to one or more LED array mounting features.
In an example embodiment, a lens may comprise one or more pieces of optical film and may be configured to modify light from linear LED arrays. The lens may further comprise two lens halves defining opposing, substantially curved inner portions, including outer edges that may be disposed in proximity to opposing edges of an aperture plane of an enclosure, and the outer edges of the two lens halves may be substantially parallel to one other. An axis of symmetry may define the two lens halves, wherein the two lens halves may be substantially similar to one another, and wherein the two lens halves may be configured to intersect or join in proximity to the axis of symmetry. The axis of symmetry may be disposed above, or in proximity to one or more LED array mounting features. The one or more pieces of optical film may comprise one or more edge trusses, wherein each of the one or more edge trusses may include one or more sides configured from a corresponding fold in the one or more pieces of optical film. At least one of the one or more sides of the one or more edge trusses may be configured at an angle relative to a front light-emitting side of the lens to impart support to the lens and to resist deflection of each edge truss.
In an example embodiment, a lens may comprise a clear or translucent substrate. The clear or translucent substrate may comprise any polymer, glass or optical film, and may be configured to modify light from linear LED arrays. The lens may further comprise two opposing outer lens edges that are substantially parallel to each other, wherein each outer lens edge may be disposed in proximity to opposing edges of the aperture plane of an enclosure. A V-shaped bi-planar center lens section may be disposed over one or more LED array mounting features, and may comprise a peak axis and two base axes, wherein the peak axis may be disposed closer to the aperture plane than the two base axes. A substantially planar middle lens section may be disposed on each side of the V-shaped bi-planar center lens section, wherein each substantially planar middle lens section may include one inner axis that is coaxial with a corresponding base axis of the center lens section and one outer axis that is closer to the aperture plane than the inner axis. The lens may also include two substantially planar outer sections, wherein each substantially planar outer section may include an outer edge that includes one of the two opposing lens edges, and an inner axis that is coaxial with the outer axis of the middle lens section.
In an example embodiment, a lens may be configured to modify light from linear LED arrays. The lens may comprise one or more pieces of optical film having a front light-emitting side and a back light-receiving side, and a V-shaped bi-planar center lens section that may be disposed over one or more LED array mounting features. The V-shaped bi-planar center lens section may comprise a peak axis and two base axes, wherein the peak axis may be disposed closer to an aperture plane of a light fixture than the two base axes, and wherein each axis may be configured from a fold in the one or more pieces of optical film. The lens may further comprise a substantially planar middle lens section on each side of the V-shaped bi-planar center lens section, wherein each substantially planar middle lens section may have one inner axis that is coaxial with a corresponding base axis of the center lens section, and one outer axis that may be closer to the aperture plane than the inner axis, and wherein each axis may be configured from a fold in the one or more pieces of optical film. The lens may further comprise two substantially planar outer sections, wherein each substantially planar outer section may include an outer edge that includes one of the two opposing lens edges, and an inner axis that may be coaxial with the outer axis of the middle lens section. The one or more pieces of optical film may comprise one or more edge trusses, wherein each of the one or more edge trusses may include one or more sides configured from a corresponding fold in the one or more optical films, wherein at least one of the one or more sides of the one or more edge trusses may be configured at an angle relative to the front light-emitting side of the one or more optical film pieces to impart support to the lens and to resist deflection of each edge truss.
In an example embodiment, a lens may be configured to modify light from linear LED arrays, the lens comprising a clear or translucent substrate comprising or one or more pieces of optical film, the lens defining a plane of incidence and having a first surface. The substrate or optical film may comprise two opposing outer lens edges that may be substantially parallel to each other, wherein each outer lens edge may be disposed in proximity to opposing edges of a light fixture aperture plane. The lens may further comprise a V-shaped bi-planar center lens section that may be disposed over one or more LED array mounting features, and may comprise a peak axis and two base axes, wherein the peak axis may be disposed closer to the aperture plane than the two base axes. A substantially planar middle lens section may be disposed on each side of the V-shaped bi-planar center lens section, wherein each substantially planar middle lens section may include one inner axis that is coaxial with a corresponding base axis of the center lens section and one outer axis that is closer to the aperture plane than the inner axis. The lens may also include two substantially planar outer sections, wherein each substantially planar outer section may include an outer edge that includes one of the two opposing lens edges, and an inner axis that is coaxial with the outer axis of the middle lens section. The lens may further comprise at least one refraction feature pattern or shape region defining a feature pattern or shape region comprising at least one refraction element The at least one refraction element may comprise, as applicable, one or more of:
a height variation of the first surface;
a thickness variation of the substrate;
a refractive index variation of the first surface;
a refractive index variation of the substrate;
a coating in contact with the first surface.
At least one refraction element of the at least one refraction feature pattern or shape region may be configured to alter a transmittance angle of at least a portion of light input to the lens at an incidence angle with respect to the plane of incidence.
In an example first implementation, a lens may be configured to modify incident light, and may comprise a top edge, a bottom edge, a left edge and a right edge collectively defining a lens plane, and may further comprise two raised lens sections. Each raised lens section may comprise an elongated rectangular shape that substantially spans between the top and bottom lens edges and may be substantially parallel to the left and right lens edges. The raised lens sections may include a substantially planar face with a light-receiving side and a light-emitting side wherein the substantially planar face may define a raised lens section plane that is elevated at a distance above the lens plane. The raised lens sections may also include two opposing edges disposed at acute angles relative to the light receiving side of the substantially planar face, wherein each edge may form an overlay attachment feature. The lens may further comprise three substantially planar sections comprising a middle planar section disposed between the two raised sections and two outer planar sections disposed on either side of the raised lens sections.
In an example embodiment, the first example implementation may include one or more optical film overlays disposed in a substantially planar configuration over the light receiving side of each raised section. The optical film overlays may comprise a strip of optical film configured to modify light; the strip of optical film comprising two opposing edges, wherein the two opposing edges nest in two opposing overlay mounting features.
In an example embodiment, the first example implementation may include one or more optical film overlays configured to modify light, wherein the one or more optical film overlays may be disposed over the light receiving side of each raised lens section. The optical film overlays may comprise a strip of optical film comprising two opposing edges and a width that is greater than a width of each raised lens section, wherein the optical film strip may configured into a curved shape by the lateral compression of two opposing edges of the optical film strip, and retained in that compressed curved state by nesting in two opposing overlay mounting features.
In an example embodiment, the first example implementation may further comprise one or more pieces of optical film configured to modify light. The one or more pieces of optical film may comprise one or more edge trusses, wherein each of the one or more edge trusses may include one or more sides configured from a corresponding fold in the one or more optical films. At least one of the one or more sides of the one or more edge trusses may be configured at an angle relative to the lens plane to impart support to the lens and to resist deflection of each edge truss. The raised lens sections and the overlay mounting features may be created by folds in the one or more pieces of optical film.
In an example embodiment, the first example implementation, the substantially planar face of each raised section may be further defined by a plane of incidence and having a first surface comprising a uniform transmittance region. Either side of the substantially planar face may be configured with three groupings of parallel and adjacent elongated linear refraction elements comprising a center grouping of elongated linear refraction elements and two outer groupings of elongated linear refraction elements. The spacing between the linear refraction elements in the two outer groupings may be smaller than the spacing between the linear refraction elements in the center grouping, and wherein each elongated linear refraction element may comprise, as applicable, one or more of:
a height variation of the first surface;
a thickness variation of the substrate;
a refractive index variation of the first surface;
a refractive index variation of the substrate;
a coating in contact with the first surface.
The elongated linear refraction elements may be configured to alter a transmittance angle of at least a portion of light input to the lens at an incidence angle with respect to the plane of incidence.
In an example embodiment, the first example implementation, the substantially planar face of each raised section may further be defined by a plane of incidence and having a first surface comprising a uniform transmittance region. Either side of the substantially planar face may be configured with a single grouping of parallel and adjacent elongated linear refraction elements wherein each elongated linear refraction element comprises, as applicable, one or more of:
a height variation of the first surface;
a thickness variation of the substrate;
a refractive index variation of the first surface;
a refractive index variation of the substrate;
a coating in contact with the first surface.
The elongated linear refraction elements may be configured to alter a transmittance angle of at least a portion of light input to the lens at an incidence angle with respect to the plane of incidence.
In an example embodiment, a lens may comprise a substrate defining a plane of incidence and having a first surface The substrate may comprise a uniform transmittance region and at least one refraction feature pattern or shape region adjacent to the uniform transmittance region and defining a feature pattern or shape region that may comprise at least one refraction element. The at least one refraction element may comprise, as applicable, one or more of:
a height variation of the first surface;
a thickness variation of the substrate;
a refractive index variation of the first surface;
a refractive index variation of the substrate;
a coating in contact with the first surface.
At least one refraction element of the at least one refraction feature pattern or shape region may be configured to alter a transmittance angle of at least a portion of light input to the lens at an incidence angle with respect to the plane of incidence.
In an example second implementation, a lens may comprise a substrate defining a plane of incidence and having a first surface. The substrate may comprise a uniform transmittance region, at least one refraction feature pattern or shape region adjacent to the uniform transmittance region and defining a feature pattern or shape region comprising at least one refraction element. The at least one refraction element may comprise, as applicable, one or more of:
a height variation of the first surface;
a thickness variation of the substrate;
a refractive index variation of the first surface;
a refractive index variation of the substrate;
a coating in contact with the first surface.
The at least one refraction element of the at least one refraction feature pattern or shape region may be configured to alter a transmittance angle of at least a portion of light input to the lens at an incidence angle with respect to the plane of incidence.
In an example embodiment of the second implementation, the at least one refraction element may comprise one or more of: an elongated linear groove, an elongated linear protuberance, and elongated linear regions comprising a coating.
In an example embodiment of the second implementation, the at least one refraction element may comprise a printed surface coating.
In an example embodiment of the second implementation, the at least one refraction element may comprise at least one refraction element comprising a refraction gradient.
In an example embodiment of the second implementation, the at least one refraction element may comprise surface variations created by a laser-based device.
In an example embodiment of the second implementation, the lens may be fabricated by an injection molding process utilizing one or more mold cavities, wherein the one or more refraction elements may comprise surface variation in the lens first surface that are created by textures or patterns in corresponding areas of the one or more mold cavities.
This sagging may be corrected to an acceptable degree by utilizing an optical film with a thicker substrate. However, the typical maximum industry standard thickness of substrates for use in optical films (usually polyester such as PETG or polycarbonate) may be applied may be 250 um. Optical films of greater thicknesses may be able to be custom manufactured, but the cost of manufacturing may be significantly higher. Regardless of availability, the overall cost of using significantly thicker substrates for example embodiments of optical film lenses may raise the manufacturing cost significantly.
Example embodiments of a film tensioning systems and methods may subsequently be described that may enable an acceptably low degree of sag of example embodiments of optical film lenses without utilizing a thicker more costly substrate. A “film tensioning system” may be referred to as example embodiments of optical film lenses with one or more edge trusses configured on each edge of an optical film sheet and configured to mount in a frame, combined with one or more film tensioning devices.
The dimensions of the lens 2301 may adjusted which in turn may adjust the amount of tension applied across the lens. Referring to
Example embodiments of film tensioning devices may comprise a somewhat flexible material, wherein after installation, the film tensioning device may flex to some degree, therein functioning as a tensioner. For example, lens tensioning device 2315 in
An example embodiment of a film tensioning device as described may comprise any configuration of mechanical apparatus that may include one or more or all of the following properties:
In consideration of these properties, example embodiments of film tensioning devices for example embodiments of film tensioning systems may be formed into a required profile utilizing flat spring metal strips. Spring metal may have an advantage of having a high strength to thickness ratio, imparting sufficient tension while having a low profile that does not interfere with the functionality of a frame. Spring steel clips may be able to be formed into a required profile shape utilizing automated processes found in the clip manufacturing industry and may be manufactured in large quantities at a relatively low cost. Spring metal may allow parts of the profile to expand to allow installation on frame-members with more complicated profiles.
On doorframe profiles that are simple and do not require much flex to the film tensioning device during installation, the film tensioning device may be fabricated using metal or plastic extrusions. Extrusions may have an advantage of being able to cut to the desired length, wherein they may be able to tension a significant portion of an entire edge truss as shown in
Referring to
In example embodiments of film tensioning systems, one or two or more film tensioning devices on each of the 2′ frame members may be installed as previously described.
One film-tensioning device may be centered and attached as previously described on each 2′ frame member. However, the width of the film tensioning devices may affect the total amount of tension applied to the lens, as well as the distribution of the applied tension. Smaller widths may concentrate the applied tension to a central area of the lens, and not apply enough tension to the side areas, which may cause distortions or rippling of the lens as well as insufficient sag reduction. As the width of an example embodiment of lens tensioning device is increased, the overall applied tension may increase, as well as the tension being more evenly distributed more towards the lens sides. The width of an example embodiment of lens tensioning device that produces acceptable sag and lack of distortions may be determined by trial and error on a given application.
In an example embodiments, a film tensioning device near each end of each 2′ frame member as shown in
In certain example implementations, a film-tensioning device may comprise a film tensioning system comprising one or more individual components. An example embodiment of film tensioning system may be shown in
In example embodiments of film tensioning systems as described in
In example embodiments, a substrate attachment system may be provided. Referring to
Referring
In an example embodiment of substrate attachment system as shown in
Example embodiments of substrate attachment systems may utilize any substrate that maybe sufficiently flexible enough wherein folds may be configured thereon without damaging the substrate. Example substrates may include thin sheet metals, reflection films, various non-optical plastic films, plastics etc. Example embodiments of substrate attachment systems may be used in any application where a substrate may require attachment. For example, plastic sheets or sheet metal may be configured to attach to frame members or channels to form enclosure surfaces etc. Example embodiments of optical film lenses may be attached to a light fixture or light fixture doorframe for example. Banners or other media may be attached to frames for display purposes.
An example embodiment of lens over-mounting, attachment and tensioning system may now be described. Referring to
As shown in
Referring to
Referring to
An example embodiment of lens mounting, attachment and tensioning system may also comprise a single sheet of rigid or semi rigid clear or translucent substrate. Referring to
With the advent of low cost energy saving LED technology, there may be a large market for retrofitting LEDs into commercial linear fluorescent light fixtures. Whether the retrofit is LED strips or LED tubes (such as T8 LED tubes for example), both retrofit examples may typically have an approximate 120 degree beam angle that does not distribute light evenly and adequately within the light fixture as would be distributed with omni-directional fluorescent tubes. This may create a large disadvantage of a relatively dark lens with very bright strips in the area directly over the LED light source, which may be objectionable to many users. An example embodiment of lens assembly and light fixture retrofit assembly may be herein described that may over the disadvantages as described.
An example embodiment of a light fixture retrofit assembly similar to that as shown in
An example embodiment of optical film lens may be shown in
The resultant curved or round lens as shown may have the advantage of distributing light over a very wide range of angles, and creating a large and evenly illuminated apparent light source. Referring to
Another advantageous element of the example embodiment of light fixture retrofit assembly as described may be the mounting system, which includes bracket 2823 and screw 2824 as shown in
Example embodiments of optical film lens strips may subsequently be described that may be suitable for use with light emitting devices, for example, the light fixture shown in
Example embodiments of optical film lens strips may be configured in any shape that may be visually pleasing or that may function to blend or hide the gap between the opposing LED strips. They may include one or more folds that may function to form different shapes. They may include edge trusses on opposing edges that may function to attach the edges to mounting channels as previously described.
In
In
In
Fluorescent troffer light fixtures with parabolic louvers used to be very popular, and may be one of the most common commercial light fixtures installed across the USA. Unfortunately, the light distribution they provide along with the light source being directly visible through the louvers may no longer be popular or desirable. As previously described, linear fluorescent fixtures are being retrofitted with LED tubes and LED strips as an alternative to fixture replacement. Parabolic troffers have no lens, so when they are retrofitted with LED strips, the harsh direct light from the LEDs may be visible, making this a very poor retrofit option. LED tubes with a frosted lens may be a better option, but they still may create thin strips of very bright light that does little to distribute that light within the fixture. An example embodiment of lens retrofit assembly may now be described that may overcome these inherent disadvantages of parabolic troffers.
The frame members 3111 may be joined at the corners with internal connectors (not shown), screws, or other fasteners or fastening methods. A magnet 3144 as shown in
Example embodiments of retrofit lenses may also be configured utilizing other lens mounting methods previously described.
An example embodiment of a method of tensioning film may now be presented. The steps in the method are shown in
a) As represented in block 330, providing at least one film piece characterized by one or more edge trusses disposed at two or more opposing edges of the at least one film piece, wherein the one or more edge trusses may be characterized by one or more folds of at least a portion of at least one of the at least one film piece, and wherein the one or more edge trusses disposed at two or more opposing edges may be further configured to support the at least one film piece in a substantially planar configuration.
As represented in block 331, providing a frame comprising at least one surface oriented at an angle greater than zero degrees relative to the film plane on two opposing sides of the frame.
As represented in block 332, providing two or more film tensioning devices or film tensioning assemblies, wherein at least one film tensioning device or film tensioning assembly may be configured to engage both an edge trusses of the at least one film piece and the at least one surface of one side of the frame, and the other at least one film tensioning device or film tensioning assembly may be configured to engage both the opposing edge truss of the at least one film piece and the at least one surface of the opposing side of the frame. The two or more film tensioning devices or film tensioning assemblies may be further configured to pull the corresponding edge truss and the corresponding at least one frame surface closer together. Tensioning devices and assemblies may include either individually, or combinations of clips, spring clips, extrusions, screws, nuts, bolts, washers, rivets, plastic fasteners, magnets, elongated strips of rigid material etc.
As represented in block 333, install the optical film lens onto the frame wherein the at least two opposing edge trusses may be disposed adjacent to the two corresponding opposing at least one surface of the frame.
As represented in block 334, attach or secure the one or more tensioning devices and or assemblies to the at least two opposing edge trusses of the optical film lens, and further attach the one or more tensioning devices and or assemblies to the corresponding at least one surface of the two opposing frame sides.
An example embodiment of a method of tensioning film may now be presented. The steps in the method may be shown in
As represented in block 340, providing a frame that comprises a surface with an outer perimeter edge, wherein one set of opposing perimeter edges has a width X.
As represented in block 341, providing at least one film piece characterized by one or more edge trusses disposed on each edge of at least two opposing edges. The one or more edge trusses may be characterized by one or more folds of at least a portion of the at least one film piece. Each edge truss may be further configured to support the at least one film piece in a substantially planar configuration. The at least one film piece and edge trusses are further configured wherein the inside distance between at least one set of two opposing edge trusses is slightly less than width X.
As represented in block 342, optionally, apply adhesive to two or more locations on either the surface of the frame that will contact the film piece after installation, or the corresponding film piece surface.
As represented in block 343, install the film piece from step B onto the frame, wherein the opposing edge trusses that were configured with the inside distance between them of slightly less than width X may be disposed adjacent to the corresponding perimeter edges of the frame with the width X.
As represented in block 344, optionally, secure the film piece to the frame with one or more of fasteners, clips, adhesives etc.
An example embodiment of a method of mounting an optical film lens on a frame or enclosure will now be presented. The steps in the method may be shown in
As represented in block 350, providing a frame or enclosure that comprises a surface with an outer perimeter edge, wherein the perimeter edge has a width X and a length Y.
As represented in block 351, providing at least one film piece characterized by one or more edge trusses disposed on each edge of the at least one film piece. The one or more edge trusses may be characterized by one or more folds of at least a portion of at least one of the at least one film piece. Each edge truss may be further configured to support the at least one film piece in a substantially planar configuration. The at least one film piece and edge trusses are further configured wherein the inside distance between one set of two opposing edge trusses is equal to or greater than width X, and the inside distance between the other set of two opposing edge trusses is equal to or greater than length Y.
As represented in block 352, optionally, apply adhesive to two or more locations on either the surface of the frame that will contact the film piece after installation, or the corresponding film piece surface.
As represented in block 353, install the film piece from step B onto the frame, wherein the opposing edge trusses that were configured with the inside distance between them of equal to or greater than than width X may be disposed adjacent to the corresponding perimeter edges of the frame with the width X, and the opposing edge trusses that were configured with the inside distance between them of equal to or greater than width Y may be disposed adjacent to the corresponding perimeter edges of the frame with the width Y.
As represented in block 354, optionally, secure the lens to the frame or enclosure with one or more of fasteners, clips, adhesives etc.
An example embodiment of a method of attaching an edge of optical film lens onto a structure will now be presented. The steps in the method may be shown in
As represented in block 360, providing a structure that comprises a channel, wherein the channel comprises at least a top and a bottom surface. The channel top or bottom may be configured with a protruding edge truss retention feature. The dimensions of the channel and edge truss retention feature may be configured to accommodate the edge of the optical film piece configured in block 361.
As represented in block 361, providing at least one film piece characterized by at least one edge truss disposed on one edge of at least one the at least one film piece. The at least one edge truss may be characterized by a fold of at least a portion of the optical film piece and includes an outer edge. The edge truss may be configured to the appropriate dimensions wherein the outer edge of the edge truss may contact the edge truss retention feature in the channel when fully inserted into the channel.
As represented in block 362, fully insert the edge of the at least one film piece with the configured edge truss into the channel of the structure, wherein the edge truss outer edge is oriented towards the edge truss retention feature in the channel, and wherein the outer edge of the edge truss contacts, and is retained by the edge truss retention feature in the channel.
An example embodiment of lens assembly may now be disclosed wherein an example embodiment of optical film lens may be supported with one or more example embodiments of novel film support devices, wherein the lens assembly when disposed horizontally, may be disposed in a substantially flat configuration without requiring an external frame. Example embodiments of film support devices may also function as light modifying elements.
A film support device may comprise any elongated structure attached to a lens surface that may function to reduce sag of the lenses surface. It may be beneficial that a lens support device be of a length that is about equal to, or somewhat less than the length of the lens it may be attached to. Example embodiments of film support devices that span the full length of a lens may impart greater support to the lens as compared to example embodiments that span less than the full length of the lens. The elongated structure should at least have sufficient elastic modulus to remain in a substantially planar configuration when suspended from each end. Preferably, one or more elongated structures may have sufficient elastic modulus to remain substantially planar when giving support to an example embodiment of optical film lens. An example embodiment of film support device may comprise any material that may have suitable elastic modulus and suitable weight for a given application. It may be preferable to utilize materials that have a high stiffness to weight ratio in order to obtain as thin a profile as possible in order to minimize shadows on the lens surface in example embodiments where the film support device may be mounted on the back light-receiving side of the lens surface. Shadows may be caused by light from one or more light sources within a light fixture that strike the film support device. In example embodiments where the film support device may be mounted on the front light-emitting side of the lens surface, a thin profile may also be preferable so the film support device does not protrude below the ceiling line. The material may comprise opaque, translucent or transparent materials. Transparent materials such as acrylic or polycarbonate my give a better aesthetic appeal as well as increased optical efficiency of the lens. An example of a translucent material that may be suitable may be an acrylic or polycarbonate with diffusion particles deposited on its surface, or embedded in the substrate.
An example embodiment of film support device may comprise any shape or size that may be aesthetically and or optically suitable for a particular application. It may comprise a flat profile, or a flat profile with strengthening ribs for example. For example, it may comprise any Fresnel or other lens profile and function to redistribute or diffuse light from a light source from within a light fixture. It may comprise a profile that may create refraction elements that may form a pattern or design on a lens surface, such as that shown in
An example embodiment of film support device may attach to an optical film lens with an adhesive or lamination. The adhesive or lamination may be applied either to the attachment surface of the film support device, or to the optical film lens, or both. In example embodiments of film support devices that comprise multiple attachment surfaces, it may be preferable to apply the adhesive or lamination to the attachment surfaces of the film support device. The attachment surfaces of the film support device may include a surface texture or pattern that may function to obscure or blend the appearance of the adhesive or lamination visible through the optical film. When an example embodiment of film support device with multiple attachment surfaces may be attached to a lens with adhesives or lamination applied to only some of the attachment surfaces, the contact area between the attachment surfaces of the film support device and the lens surface may look visually differently in the contact areas with adhesives or lamination, as compared to contact areas without adhesives or lamination. This difference may be used to advantage to give a visual accent or differentiation to that area compared to other contact areas without the adhesives or lamination. Alternatively, the adhesives or lamination may be applied evenly to all the attachment surfaces. Example embodiments of film support devices may be attached to optical film lenses using any other suitable method that may be visually suitable. For example, thermo-bonding methods may be utilized if visually acceptable. Fasteners such as screws, clips or rivets may also be utilized, and may be fastened through the lens face or through a lens edge truss.
Any example embodiments of film support devices may also attach to, or support an optical film lens on the front light-emitting side of the lens. In such configurations, attachment to the lens utilizing adhesives or lamination may only require the adhesive or lamination to only be applied near the ends of the film support device since the lens face may be disposed on top of, and supported by the film support devices, wherein gravity may cause the lens surface to sufficiently contact the film support device. This may advantageously lower manufacturing costs and may be visually more appealing in some applications. Alternatively, thin end panels, perhaps utilizing the same substrate as the film support devices, may be glued or fastened to the ends of the film support devices, and to the corresponding sides of the edges trusses of the lens, wherein no adhesives or lamination may be required on the light-emitting lens face. Any other means for fastening the film support devices to the optical film lens may be utilized that may provide acceptably secure attachment and be visually acceptable.
When an example embodiment of film support device 3733 may be attached as described to an example embodiment of optical film lens 3701 as shown in
Example embodiments of film support devices may be configured to be thin and light enough wherein they may provide a small degree of sag that may match the small degree of inherent sag between the film support devices and the edges of the lens. This may provide a smoother visual transition from one edge of the lens to the other with minimal dips or distortions.
Examples embodiments of lens assemblies may include any optical film light modifying elements or example embodiments of optical film lenses described in this application, or described in related applications. For example, example embodiments of frameless optical film lenses as described in related applications may be utilized, wherein the frameless lenses may attach to a light emitting device without a frame, and may be suspended in a substantially planar configuration therein.
An example embodiment of film support device may be shown in
Referring to
An example embodiment of lens assembly with example embodiments of film support devices may be shown in
According to various implementations of the disclosed technology, a light emitting device may be provided. The light emitting device may comprise an enclosure that comprises a back surface, four sides, a top edge surface associated with each of the four sides, and an opening defined by the four sides. The top edge surfaces may be disposed adjacent to the opening. The enclosure may be capable of mounting on a grid frame of a suspended ceiling such that a portion of the top edge surface of at least two of the four sides contacts a portion of the grid frame. The light emitting device may further comprise a light modifying element capable of modifying light from a light source. The light modifying element may be characterized by a substrate with four or more edges, a light-receiving back surface disposed on the entirety of, or a portion of the top edge surface of each of the four sides of the enclosure, and a light-emitting front surface. All or a portion of a periphery of the light-emitting front surface may be capable of contacting, or being disposed in close proximity to the grid frame after the light emitting device is mounted to the grid frame.
In the example implementation, the light modifying element of the light emitting device may be further characterized by at least one film piece with at least one supporting edge truss on at least two opposing edges of the at least one film piece. Each supporting edge truss may be configured from a corresponding fold in the at least one film piece, wherein the supporting edge trusses may be angled towards the light-receiving back surface. The supporting edge trusses on the at least two opposing sides of the light modifying element may be disposed outside the area defined by an outer perimeter of the top edge surfaces of the enclosure sides.
In the example implementation, the light emitting device may be further defined by an outer perimeter edge of each of a first two opposing top edge surfaces of the enclosure sides defining a width W of the enclosure equal to a distance X. The light modifying element may be further defined by at least one film piece with at least one supporting edge truss on at least two opposing edges of the at least one film piece, wherein each edge truss may be configured from a corresponding fold in the at least one film piece. Each supporting edge truss may be angled towards the light-receiving back surface wherein the distance between the at least two opposing edge truss folds may be less than the distance X, therein causing the at least two opposing edge trusses to be forced laterally apart and therein creating tension across the light modifying element.
In the example implementation, the light modifying element may be further characterized by a rigid or semi-rigid clear or translucent substrate.
In the example implementation, the light modifying element may be attached to the top edge surface of one or more sides of the enclosure with an adhesive or fasteners.
In the example implementation, the enclosure may comprise at least a portion of a troffer light fixture.
According to various implementations of the disclosed technology, a substrate attachment system may be provided. The substrate attachment system may comprise a substrate having a first surface configured with at least one supporting edge truss configured from a corresponding fold in the substrate. The fold may be adjacent to a least one edge of the substrate, wherein the at least one supporting edge truss may be configured at an angle relative to the first surface, and wherein the at least one supporting edge truss may include an outer perimeter edge. The example embodiment of a substrate attachment system may further comprise at least one elongated frame member with a cross section comprising at least two segments, wherein the at least two segments may define at least a first surface and an adjacent second surface. The adjacent second surface may further comprise an edge truss retention feature. The substrate may be capable of being attached to the at least one elongated frame member such that the first surface of the substrate may be disposed on the first surface of the at least two frame segments, and the outer perimeter edge of the edge truss may be engaged by the edge truss retention feature on the adjacent second surface of the at least two frame segments.
In the example embodiment, the substrate may comprise an optical film.
In the example embodiment, the substrate may comprise sheet metal.
In the example embodiment, the substrate may comprise a reflective substrate.
According to various implementations of the disclosed technology, a film tensioning system may be provided. The film tensioning system may comprise at least one film piece defining a film plane, and may be characterized by at least one supporting edge truss on two or more opposing edges of the at least one film piece. Each supporting edge truss may be configured from a corresponding fold in the at least one film piece, wherein each supporting edge truss is further configured to assist in the support of the at least one film piece in a substantially planar configuration. The film tensioning system may further comprise a frame comprising at least one film attachment surface on each of two opposing sides of the frame, wherein the film attachment surface may be oriented at an angle relative to the film plane. At least one film tensioning device may engage both a supporting edge truss of the at least one film piece and the at least one film attachment surface of one side of the frame. Another at least one film tensioning device may engage both the opposing supporting edge truss of the at least one film piece and the at least one film attachment surface of the opposing side of the frame. Each film tensioning device may be configured to pull a corresponding supporting edge truss and a film attachment surface closer together to impart tension within the at least one film piece.
In the example embodiment of film tensioning system, each film-tensioning device may comprise one or more of clips, spring clips, extrusions, screws, washers, nuts, bolts, rivets, plastic fasteners, magnets, or one or more elongated strips or extrusions of rigid or semi-rigid material.
In the example embodiment of film-tensioning system, the frame may comprise a light fixture doorframe.
In the example embodiment of film-tensioning system, the at least one film piece may be characterized by an optical film configured to modify light.
The example embodiment of film-tensioning system may further comprise two film-tensioning devices attached to the corresponding supporting edge trusses and film attachment surfaces on each of two opposing sides of the frame.
According to various implementations of the disclosed technology, a lens assembly may be provided. The lens assembly may comprise an elongated structure comprising at least two opposing attachment features, wherein each of the at least two opposing attachment features may comprise at least a first surface and an adjacent second surface, and wherein the adjacent second surface may further comprise an edge truss retention feature. The lens assembly may further comprise at least one optical film piece defining an aperture plane and may have a first surface configured with at least one supporting edge truss on at least two opposing edges of the optical film piece. The at least one supporting edge truss may be configured from a corresponding fold in the at least one optical film piece, wherein the fold may be adjacent to at least one edge of the at least one optical film piece. The at least one supporting edge truss may be configured at an angle relative to the aperture plane, wherein each supporting edge truss may include an outer perimeter edge. At least one optical film piece may be capable of attachment to the elongated frame member such that a portion of the first surface of the optical film piece may be disposed on the first surfaces of the at least two opposing attachment features, and the outer perimeter edge of each opposing supporting edge truss may be capable of engaging with the corresponding edge truss retention feature wherein the aperture plane may form a curve.
The example implementation of lens assembly may further comprise one or more linear LED arrays. In the example implementation of lens assembly, the elongated structure and the at least one optical film piece may be further configured for use with a light emitting device.
The example implementation of lens assembly may further comprise one or more linear LED arrays, wherein the lens assembly may be a retrofit LED lighting module configured to retrofit in a light fixture. In the example implementation of lens assembly, the elongated structure may be capable of dissipating heat from one or more linear LED arrays.
While certain implementations of the disclosed technology have been described in connection with what is presently considered to be the most practical and various implementations, it is to be understood that the disclosed technology is not to be limited to the disclosed implementations, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
This written description uses examples to disclose certain implementations of the disclosed technology, including the best mode, and also to enable any person skilled in the art to practice certain implementations of the disclosed technology, including making and using any devices or systems and performing any incorporated methods. The patentable scope of certain implementations of the disclosed technology is defined in the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal language of the claims.
This application is a Continuation-In-Part of U.S. patent application Ser. No. 14/254,960, (U.S. Patent Publication No. 20140233231) entitled “Light Fixtures and Multi-Plane Light Modifying Elements,” filed Apr. 17, 2014. This application also claims the benefit of the following United States Non-Provisional Patent Applications, the contents of which are incorporated by reference in their entirety as if set forth in full: US Patent Publication No. US20120300471 entitled “Light Diffusion and Condensing Fixture,” filed Jul. 23, 2012; US Patent Publication No. US20140204590 entitled “Frameless Light Modifying Element,” filed Mar. 26, 2014; and US Patent Publication No. US20140211484 entitled “Light Modifying Elements” filed Apr. 1, 2014. This application also claims the benefit of PCT Application No. PCT/US2013/039895, entitled “Frameless Light Modifying Element,” filed May 7, 2013; PCT Application No. PCT/US2013/059919, entitled “Light Modifying Elements,” filed Sep. 16, 2013, the contents of which are also incorporated by reference in their entirety as if set forth in full. This application also claims the benefit of the following United States Provisional Patent Applications, the contents of which are incorporated by reference in their entirety as if set forth in full: U.S. Provisional Patent Application No. 61/958,559, entitled “Hollow Truncated-Pyramid Shaped Light Modifying Element,” filed Jul. 30, 2013; U.S. Provisional Patent Application No. 61/959,641 entitled “Light Modifying Elements,” filed Aug. 27, 2013; U.S. Provisional Patent Application No. 61/963,037, entitled “Light Fixtures and Multi-Plane Light Modifying Elements,” filed Nov. 19, 2013; U.S. Provisional Patent Application No. 61/963,603, entitled “LED Module,” filed Dec. 9, 2013; U.S. Provisional Patent Application No. 61/963,725, entitled “LED Module and Inner Lens System,” filed Dec. 13, 2013; U.S. Provisional Patent Application No. 61/964,060, entitled “LED Luminaire, LED Mounting Method, and Lens Overlay,” filed Dec. 23, 2013; U.S. Provisional Patent Application No. 61/964,422, entitled “LED Light Emitting Device, Lens, and Lens-Partitioning Device,” filed Jan. 6, 2014; and U.S. Provisional Patent Application No. 61/965,710, entitled “Compression Lenses, Compression Reflectors and LED Luminaires Incorporating the Same,” filed Feb. 6, 2014; and U.S. Provisional Patent Application No. 61/999,519, entitled “Optical Film Tensioning, Mounting and Attachment Systems” filed Jul. 30, 2014. This application is also related to US Patent Publication US20140240980 entitled “Optical Film Compression Lenses, Overlays and Assemblies” filed May 2, 2014, the contents of which are incorporated by reference in entirety as if in full.
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| Number | Date | Country | |
|---|---|---|---|
| 20150016108 A1 | Jan 2015 | US |
| Number | Date | Country | |
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| 61959641 | Aug 2013 | US | |
| 61963037 | Nov 2013 | US | |
| 61963603 | Dec 2013 | US | |
| 61963725 | Dec 2013 | US | |
| 61964060 | Dec 2013 | US | |
| 61964422 | Jan 2014 | US | |
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| Parent | 14231819 | Apr 2014 | US |
| Child | 14225546 | US | |
| Parent | PCT/US2013/039895 | May 2013 | US |
| Child | 14231819 | US | |
| Parent | PCT/US2013/059919 | Sep 2013 | US |
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| Child | PCT/US2013/059919 | US |
