1. Field of the Invention
The present invention generally relates to lighting devices, and more particularly to lighting devices for illuminating shelves, displays, and the like.
2. Background
Over the years, improvements in the number and types of lighting devices used for illuminating shelves, displays, and spaces for retail/commercial and/or private applications have been made. Retail/commercial applications may include shelving and displays in various locations, such as supermarkets, drug stores, department stores, warehouse stores, and so forth. Such lighting devices are commonly used to illuminate retail products for easier observation by consumers. They can also be used to create desired lighting effects for retail products, commercial spaces, and the like.
These lighting devices are commonly mounted in shelves or displays so they are able to illuminate retail products or spaces, and it is preferable for them to not be seen or readily noticeable. To effectuate such illumination without the device itself being readily visible, the lighting devices may be substantially low profile such that their length is significantly longer than their height. Such lighting devices may thus be housed in low profile extrusions.
Light emitting diodes (LEDs) mounted on circuit boards may be used within these lighting devices, although other types of light emitting devices may also be used. LEDs are solid state devices that convert electric energy to light, and generally comprise one or more active layers of semiconductor material sandwiched between oppositely doped layers. When a bias is applied across the doped layers, holes and electrons are injected into the active layer where they recombine to generate light. Light is emitted from the active layer and from all surfaces of the LED.
Developments in LED technology have resulted in devices that give off less heat and are brighter, more efficient and more reliable. LEDs are now being used in many applications that were previously the realm of incandescent fluorescent or neon bulbs; some of these include displays, shelf lighting, commercial lighting, and any other application where lighting is desirable or may be required.
It is desirable to have a lighting apparatus mountable in shelving, displays, commercial spaces, and the like for illuminating consumer products and/or providing desired illumination effects while increasing light optimization and decreasing the heat given off and the overall energy required to power the device. Moreover, it is desirable to provide a lighting apparatus that is durable, relatively low profile, and can be customized to fit and be mounted on a variety of different structures. Additionally, it is desirable to provide a lighting apparatus that may be daisy-chained to one or more additional lighting apparatuses and power transfer devices to provide sufficient power for illuminating multiple shelves/displays; the connected lighting devices may be arranged in horizontal and/or vertical layouts.
The present invention provides apparatuses, systems, and methods for lighting devices for use in shelving, displays, and the like with increased light optimization, durability, and customization and decreased energy footprints. One embodiment provides a lighting device comprising an elongated extrusion with a first surface and a second surface proximate the first surface, wherein the second surface is substantially reflective. It further comprises one or more light emitting devices mounted at the first surface of the extrusion. The first surface is angled with respect to the second surface such that at least a portion of the light emitted from the one or more light emitting devices reflects off the second surface.
Another embodiment provides a lighting device comprising an elongated extrusion with a first surface and a second surface proximate the first surface. One or more light emitting devices are also provided, with the light emitting devices mounted at the first surface of the extrusion. A lens between the first and second surface is also provided, with the lens protecting the one or more light emitting devices. The first surface is angled with respect to the second surface such that at least a portion of the light emitted from the one or more light emitting devices reaches the second surface.
Another embodiment provides a lighting system with a plurality of lighting devices, with each lighting device comprising: an elongated extrusion with a first surface and second surface proximate the first surface, and one or more light emitting devices mounted at the first surface of the extrusion. The first surface is angled with respect to the second surface such that at least a portion of the light emitted from the one or more light emitting devices reaches the second surface. The system further provides one or more power transfer devices electrically connecting the lighting devices, and at least one power supply device providing electrical power to the power transfer devices and lighting devices.
Another embodiment provides a method for providing lighting for shelving or a display. The method comprises providing: two or more lighting devices, and one or more power transfer devices. The two or more lighting devices are electrically connected with at least one of the power transfer devices, with the lighting devices connected in one or both of a horizontal or vertical arrangement. Furthermore, at least one power supply device is provided for electrically powering each of the power transfer devices and lighting devices.
These and other further features and advantages of the invention would be apparent to those skilled in the art from the following detailed description, taken together with the accompanying drawings, in which:
a is a perspective view of a plurality of connected lighting devices underneath shelving used in accordance with the present invention;
b is a perspective view looking down on the shelving of
a is a diagram of lighting devices mounted in shelves according to the present invention;
b is a diagram of light emission patterns of the mounted lighting devices of
The following description presents several possible embodiments. This description is not to be taken in a limiting sense but is made merely for the purpose of describing the general principles of the invention, the scope of which is further understood by the appended claims.
The present invention provides apparatuses, systems, and methods for lighting devices, in particular lighting devices used to illuminate shelves, displays, and spaces in retail/commercial and/or private spaces. Some embodiments are particularly applicable in illumination applications for shelf lighting, refrigeration lighting, displays, magazine racks, and any other location where linear lighting may be required. The optoelectronic elements may include one or more circuit boards with light emitting diodes (LEDs), solar cells, photodiodes, laser diodes, and other such optoelectronic elements or combinations of optoelectronic elements. Preferred embodiments of the present invention are generally directed to lighting devices incorporating LEDs, but it is understood that the other light emitting devices discussed may also be used. Some embodiments of the lighting devices are designed, at least in part, to emit light in focused, customized emission paths to most effectively illuminate displays, products, spaces or the like while also reducing the power needed to operate the devices.
The lighting devices comprise an extrusion which is easy to manufacture, low in cost, easy to use and mount, and houses the light emitting device(s) in a precise and aesthetically pleasing manner. The lighting device is also preferably substantially low profile such that the height of its body is short in comparison to the length of its body. Furthermore, the lighting devices are customizable to a variety of different lengths and shapes, and particularly adapted to applications where linear lighting is desired or required in vertical and/or horizontal configurations. It is understood, however, that the lighting devices can be used for many different applications. Exemplary methods for manufacturing the main body of such lighting devices may include, for example, forming extrusions using processes well known in the art. However, it is understood that many other manufacturing methods may be used.
The lighting devices can further comprise at least one end cap to protect the housed components and allow passage of a cable into the housing. The end caps may also allow for rotation of the lighting devices such the angles of the emitted light can be changed as desired. The lighting devices may each generally consist of a hollow center with an inner surface for holding light emitting devices. The inner surface may be particularly adapted for holding printed circuit boards with LEDs, but it understood that many other electronic devices and/or optoelectronic devices may be incorporated in the housing.
The present invention is described herein with reference to certain embodiments but it is understood that the invention can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In particular, the present invention is described below in regards to lighting devices with extrusions having angled surfaces for optimal, focused light emission, but it is understood that lighting devices according to the present invention can be used for emitting light in many different ways/directions.
It is also understood that when an element or feature is referred to as being “on” another element or feature, it can be directly on the other element or feature or intervening elements may also be present. Furthermore, relative terms such as “inner”, “outer”, “upper”, “above”, “lower”, “beneath”, and “below”, and similar terms, may be used herein to describe a relationship of one element or feature to another. It is understood that these terms are intended to encompass different orientations of the housing and its components and contents in addition to the orientation depicted in the figures.
Although the terms first, second, etc. may be used herein to describe various elements, components, features and/or sections, they should not be limited by these terms. These terms are only used to distinguish one element, component, feature or section from another. Thus, a first element, component, feature or section discussed below could be termed a second element, component, feature or section without departing from the teachings of the present invention.
Embodiments of the invention are described herein with reference to illustrations that are schematic illustrations of idealized embodiments of the invention. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances are expected. Embodiments of the invention should not be construed as limited to the particular shapes of the regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. A feature illustrated or described as square or rectangular can have rounded or curved features due to normal manufacturing tolerances. Thus, the features illustrated in the figures are not intended to illustrate the precise shape of a feature and are not intended to limit the scope of the invention.
As can be seen in
The first surface 14 is designed to accept circuit board 20 and LEDs 22. The circuit board 20 and LEDs 22 may be placed on and secured to first surface 14 using adhesives, soldering, posts, screws, or other common bonding means as well known in the art. Alternatively, circuit board 20 with incorporated LEDs 22 may be slid into a groove of first surface 14 sized to securely accept circuit board 20 (see
The extrusion 12 is preferably made from aluminum, although it is understood that other metals or materials such as acrylic or plastic may also be used. The extrusion 12 preferably contains facets to reflect light from the light emitting devices in order to optimize the lighting profile. Accordingly, extrusion 12 may comprise an integrated reflector 17, which is preferably incorporated with second surface 16, but it is understood that portions of first surface 14 may also comprise reflective characteristics. The integrated reflective surface may be achieved by polishing the aluminum of the extrusion; this can be accomplished by anodizing the surface and polishing a mirror-like finish as is well known in the art. Alternatively, the reflective surface may be achieved by providing reflective tape or a reflective insert such as a plastic insert.
The reflector 17 is incorporated for focusing light from the light emitting devices and creating desired illumination patterns. The angle of reflector 17 may be customized to optimize light emission for a variety of different light emitting device viewing angles. The reflector may be used to direct light emission such that products/items in displays and/or shelving may be optimally illuminated. For example, the light may be directed such that it creates light peaks to best highlight products on display in shelves.
The third surface 18, which may be a lens and/or protective cover, is preferably made from a substantially clear material with light diffusive and directive properties such as acrylic or glass, although it is understood that other materials and colors may be used as well. Light diffusants such as scattering particles (e.g. Titanium oxides) or calcium carbonate may be added to the third surface 18 material during the fabrication process. To further maximize the diffusive properties of third surface 18, the surface finish should be as smooth as possible. Possible diffusive properties of the third surface 18 allow the light sources on the circuit board to appear as one, continuous light source when they emit light. Furthermore, the third surface 18 may form a variety of different shapes to change the convergence of emitted light paths such that the light emitted from the lighting device 10 may be further directed as desired.
Circuit board 20 preferably comprises a plurality of LEDs 22 along its length. However, it is understood that other suitable light emitting devices may also be used in accordance with the present invention. LEDs are desirable because they require less energy to operate more efficiently than traditional lighting in linear applications. LEDs 22 may be incorporated to emit any color or combination of colors according to desired emission effects; the colors may also be adapted to change frequently if desired. For example, in applications where the lighting device(s) will be used to illuminate products, white light is likely preferable to best show off the features of the products. In application where the lighting device(s) will be used to illuminate spaces, any color or combination of colors can be used as desired.
Magnet(s) 24 may be provided on the back side of first surface 14 to attach the lighting device 10 to a metal surface such as a shelf. However, it is understood that other attachment means may be provided, such as screws, double-sided adhesive tape, track system, surface bonding, simple placement on a supporting surface, or the like.
As a result of the low profile shape of lighting device 10, the external ends preferably comprise a surface area that is minimized when compared to the surface area along the length of the lighting device 10. This allows the ends to be capped more easily and efficiently than a lighting device with a comparatively larger surface area on its capping/sealing portion. Moreover, the low profile design of the lighting device allows for it to be more easily mounted out of view.
Grooves 28a, 28b may be provided to accept the edges along the length of third surface 18. It is understood that such grooves are not needed when a third surface 18 is co-extruded with first and second surface 14,16. When third surface 18, such as a lens and/or protective cover, is later installed onto extrusion 12, grooves 28a, 28b are sized to fit accept the edges of third surface 18 such that it may be easily slid into place while also securely holding third surface 18 in place. In addition to the secure fit realized by grooves 28a, 28b, adhesives or other bonding means may be used to further secure third surface 18 into place.
Second flanges 32 may be provided to coincide with indentations in an end cap (see, e.g.,
End cap 31 may include internal flanges and indentations (not shown) to correspond and fit with second flanges 32 and indentations in extrusion 12; as such, the end cap may be sized to slide over the end of extrusion 12, with the various flanges and indentations providing a secure fit. End cap 31 is preferably sized to be slightly larger than the external portion of at least one end of extrusion 12 to compensate for any changes in the extrusion 12 caused by manufacturing variations and or thermal expansion. While end cap 31 is depicted as having a generally triangular cross-section to conform with a generally triangular end of extrusion 12, it is understood that the end cap 31 may be configured in any number of relevant shapes, such as a square, rectangle, or oval.
When the end cap 31 is placed on at least one end of the extrusion 12, an adhesive, in addition to the flanges and indentations of cap 31 and extrusion 12, may be used to further secure the end cap 31 to the extrusion 12. While any number of adhesives known in the art can be used, it may be preferable to use an adhesive that is thermally resistive and can seal the interior of the extrusion from environmental conditions such as moisture.
End cap 31 further comprises an extension 33 with a hole 36, a cable hole or power socket 38 and an angle adjustment portion 41. The extension 33 provides an additional surface extending away from the main body of end cap 31, which is used to secure the end cap to an external surface. However, it is understood that there are any number of various extensions, protrusions and the like that may be alternatively used to secure the end cap to an external surface. A screw, nail, post or the like may be passed through hole 36 to connect end cap 31 to an external surface.
Cable hole or power socket 38 is provided in end cap 31 such that a cable (not shown) may be passed through to provide power to the housed light emitting devices; alternatively, power socket 38 is provided to accept a plug from a power supply (not shown). The diameter of hole or socket 38 may be slightly larger than the diameter of the cable or plug such that the cable or plug may be easily fitted through hole 38. Alternative, if an end cap is made of a substantially flexible material such as silicone, the diameter of the hole 38 may be sized slightly smaller than the diameter of a cable such that a seal is created around the cable to prevent environmental conditions from infiltrating the interior of the lighting device 10.
Angle adjustment portion 41 may be provided in end cap 31 to allow for the angle of the extrusion 12 and integrated reflector 17 to be altered to direct the light emitted from lighting device 10 in a preferred manner. The angle adjustment portion 41 can comprise a number of different mechanisms to allow for such angular adjustment, with one simple mechanism comprising a screw or the like that may be loosened such that the extrusion can be tilted; once the extrusion and its integrated reflector 17 are in a desired position for optimized light emission, the screw can be retightened to hold the extrusion in place. The screw of angle adjustment portion 41 may correspond to one or more of the indentations between second flanges 32 of the extrusion, with those indentations moveable with respect to the angle adjustment portion 41. While the above-described mechanism provides one possible embodiment for angular adjustment of the reflector 17, it is understood that additional mechanisms would be contemplated in practicing the present invention. For example, the integrated reflector 17 may comprise a portion that is separate from extrusion 12, such that extrusion 12 itself is not moveable by angle adjustment portion 41, but the angle of reflector 17 alone is moveable by angle adjustment portion 41.
The overhang portion 42 is proximate first surface 14, and provides a further surface for light emitted from light emitting devices at said first surface 14 to reflect off of. In this way, at least some of the light emitted from light emitting devices can emit toward either or both of second surface 16 and overhang portion 42. If either or both second surface 16 and overhang portion 42 comprise reflective surfaces (such as reflector 17 on second surface 16), then light can be reflected off of surface 16 and/or portion 42. Depending on the angles of surface 16 and portion 42, light emitted from first surface 14 can be reflected off surface 16 and portion 42 in any number of reflective paths. In this way, the characteristics of the light emitting from lighting device 10 are customizable and can be directed in any direction for any desired application. The overhang portion 42 may further be added to diminish any haloing effects that may otherwise exist in extrusions without such an overhang portion. Haloing effects may or may not be desirable depending on the intended application and desired effects of a lighting device according to the present invention.
Extrusion 40 further comprises grooves 44a, 44b, which are similar to grooves 28a, 28b described above. The main difference is groove 44b is integral to overhang portion 42, where groove 28b was integral to first surface 14. As with grooves 28a, 28b, grooves 44a, 44b may be provided to accept the edges along the length of third surface 18. It is understood that such grooves are not needed when a third surface 18 is co-extruded with first surface 14, second surface 16, and overhang portion 42. When third surface 18, such as a lens and/or protective cover, is later installed onto extrusion 12, grooves 44a, 44b are sized to accept the edges of third surface 18 such that it may be easily slid into place while also securely holding third surface 18 in place. In addition to the secure fit realized by grooves 44a, 44b, adhesives or other bonding means may be used to further secure third surface 18 into place.
For an extrusion 40, the dimensions may be slightly different, particularly with respect to the angles between: the overhang portion 42 and first surface 14; and second surface 16 and first surface 14. For example, according to one embodiment, the dimensions of the extrusion 40 are particularly adapted for use in shelves that are 18 inches deep and 12 inches apart. The angles of the various surfaces are provided for optimized light emission to showcase the contents of such shelves. However, it is understood that different dimensions and angles would be preferred for shelving/displays with different orientations and spacings. For this example, the angle between the surface of overhang portion 42 proximate the top of first surface 14 is approximately 102.50 degrees. The angle between the top of first surface 14 and the reflective surface of second surface 16 is approximately 120 degrees.
End cap 30 may include internal flanges 34 and indentations between the flanges to correspond and fit with second flanges 32 and indentations in extrusion 12; as such, the end cap may be sized to slide over the end of extrusion 12, with the various flanges and indentations providing a secure fit. Furthermore, end cap 30 may comprise front angled portion 35 and rear portion 37 that, together with a bottom portion are fitted together to slide onto and extend slightly over at least one end of extrusion 12. End cap 30 is preferably sized to be slightly larger than the external portion of at least one end of extrusion 12 to compensate for any changes in the extrusion 12 caused by manufacturing variations and or thermal expansion. Rear portion 37 may additionally comprise holes 39, through which screws, posts, nails, or the like may be passed to further secure the end cap 30 to the end of extrusion 12. While end cap 30 is depicted as having a generally triangular cross-section to conform with a generally triangular end of extrusion 12, it is understood that the end cap 30 may be configured in any number of relevant shapes, such as a square, rectangle, or oval.
When the end cap 30 is placed on at least one end of the extrusion 12, an adhesive, in addition to the flanges and indentations of cap 30 and extrusion 12, may be used to further secure the end cap 30 to the extrusion 12. While any number of adhesives known in the art can be used, it may be preferable to use an adhesive that is thermally resistive and can seal the interior of the extrusion from environmental conditions such as moisture.
End cap 30 further comprises an extension 33 with a hole 36 and a cable hole or power socket 38 similar to those described above with respect to end cap 31. The extension 33 provides an additional surface extending away from the main body of end cap 30, which is used to secure the end cap to an external surface. However, it is understood that there are any number of various extensions, protrusions and the like that may be alternatively used to secure the end cap to an external surface. A screw, nail, post or the like may be passed through hole 36 to connect end cap 30 to an external surface.
Cable hole or power socket 38 is provided in end cap 30 such that a cable or plug (not shown) may be passed through to provide power to the housed light emitting devices. The diameter of hole or socket 38 may be slightly larger than the diameter of the cable or plug such that the cable or plug may be easily fitted through/into hole or socket 38. Flexible flanges or the like may be incorporated to the interior of hole or socket 38 that are angled slightly toward one another to provide traction on a cable or plug such that is more securely held in place in hole or socket 38. Alternative, if an end cap is made of a substantially flexible material such as silicone, the diameter of the hole 38 may be sized slightly smaller than the diameter of the cable such that a seal is created around the cable to prevent environmental conditions from infiltrating the interior of the lighting device 10.
While end caps 30 and 31 are designed to fit over extrusion 12, it is understood that slight modifications to their respective designs can enable them to fit over a different extrusion such as extrusion 40. For example, an end cap can be alternatively shaped to account for the overhang portion 42 of extrusion 40. Furthermore, it is understood that some end caps can be provided without a cable hole 38 for applications when no power cable is needed through one end of an extrusion, such as when a lighting device is the last in a daisy-chain of connected lighting devices.
a, 12b shows a shelving display 50 wherein a plurality of lighting devices 10 are daisy-chained to one another in adjacent shelving gondolas. While there are two adjacent lighting devices 10 connected in this application, it is understood that any number of lighting devices may be connected in numerous configurations. End caps 30 (or 31) are provided on the ends of extrusions 12 to allow wire(s) and/or cables (not shown) to pass through and/or between lighting devices 10 and end caps 30 or 31. A power device (not shown) is connected to the wire/cables to provide power to the connected devices 10. In
a, 13b show a simulation depicting the emission patterns of a lighting device according to the present invention. The lighting simulation was done for shelves 18 inches deep and 12 inches apart, but it is understood that similar simulations may be done for any length and configuration of shelves and/or displays. Furthermore, the lighting devices 10 used in the simulation were 46 inches long and each comprising thirty LEDs, with the extrusion itself being 45.5 inches long and the additional 0.5 inches in length provided by the end caps. It is understood that other lengths for lighting devices are contemplated in practicing the present invention.
In
In
In
Each of modules 82, 92, 94 may comprise a mounting portion with hole 90. A screw, nail, post, or the like may be placed through hole 90 so as to mount the power transfer devices 80 to an external surface such as a shelf, wall, or display. Alternatively, other means of mounting may be used, such as double-sided tape or other bonding means well known in the art.
Power supply 104 supplies power to first module 82, which then supplies power to the first module 92 via cable 88 and a first lighting device (not shown) via left output 85. First module 92 then supplies power to second module 92 via cable 88 and a second lighting device (not shown) via left output 85 and so on until power reaches the last power transfer device 80 in the harness 106. Once power reaches module 94, module 94 will supply power to another lighting device via output 85, but will not supply power to any additional power modules in the harness 106 as it is the last in line.
While
An external power supply 104 is used to power the first lighting device on gondola 112a. The first lighting device then supplies power to a module 92 via leftmost cable 88, which in turn supplies power to a connected second lighting device located on gondola 112b via rightmost cable 88. Second lighting device then supplies power to a second module 92 via leftmost cable 88, which in turn supplies power to a connected third lighting device located on gondola 112c and so on until power reaches the last lighting device in the daisy-chain.
The power supplies 104 supply power to the first module in each harness 106, which then supplies power to the second module via cable 88 and first and second lighting devices (not shown) via left output 85 and right output 87 respectively. Although it is not shown, it is appreciated that lighting devices are mounted on the shelves to both the left and right of each harness 106, such that each harness is providing power to two gondolas at a time. The second module then supplies power to a third module via cable 88 and a third and fourth lighting device (not shown) via left output 85 and right output 87 and so on until power reaches the last power transfer device 80 in the harness 106. Once power reaches the last module, that module will supply power to lighting devices to its left and right via outputs 85 and 87, but will not supply power to any additional power modules in the harness 106 as it is the last in line.
While
In
The dimmer 130 may also comprise a mounting protrusion 140 with a hole for accepting a screw, nail, post, or the like for mounting the dimmer on an external surface. Alternatively, the dimmer 130 may be mounted using double-sided tape, adhesive, or other bonding means well known in the art.
While
Although the present invention has been described in considerable detail with reference to certain preferred configurations thereof, other versions are possible. Accordingly, the spirit and scope of the invention should not be limited to the preferred versions of the invention described above.
This application claims the benefit of provisional application Ser. No. 61/251,216 to Thomas Sloan, et al., which was filed on 13 Oct. 2009.
Number | Date | Country | |
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61251216 | Oct 2009 | US |