Patent Application
20130294074
The invention relates to a lamp having a housing for the reception of a plurality of illuminants, preferably arranged in a plane, as well as possibly having a required ballast, driver and the like; and having a scattered light disc forming a direct light surface at the room side, in particular in the form of a micro prismatic surface or a satin surface or an opaque surface, wherein the scattered light disc is held in a frame which can be coupled to the housing.
Known lamps of this kind are used as installation lamps, mount lamps and possibly as lamps hung with respect to the respective ceiling.
For example, a lamp is known from the EP 2 023 035 A1 in which the illuminants are present in the region of a frame part enclosing a scattered light surface and are directed at a reflection surface arranged between a base part and a frame part. An extending space body is present between the base part and the frame part bounding the scattered light surface at the boundary side. The space body is formed by a base section, an inclined surface section which is adjacent to the base section and which extends at all sides and a one part boundary section adjoining the inclined surface section. The boundary section is configured as a support for the frame part. This space body can totally be of transparent design, so that, on an impingement with light the boundary section made as one part with the inclined surface section is also illuminated in addition to the illuminated inclined surface section. Thereby a circumferential light reflecting region arises which is optically spaced apart with respect to the scattered light surface and which is formed by the boundary section.
It is the object of the invention to configure lamps of the initially named kind, on the one hand, as simple as possible from a construction point of view and in a manner which enables a cost-effective manufacture and, on the other hand, to achieve additional esthetically pleasing characteristic light effects via the direct light surface while simultaneously ensuring a uniform illumination density distribution.
This object is satisfied starting from a lamp defined in the preamble of the main claim which is characterized in that the frame designed in a closed manner, has a surrounding guide limb part which can be received substantially in a form-fitting manner in the housing, and an inwardly directed support limb part extending perpendicular to the guide limb part and in that a light permeable, surrounding strip of predefinable color, in particular differing from the color of the scattered light disc, is arranged in an edge holding fixture formed by the guide limb part and the support limb part; and the scattered light disc, on whose full area light is incident, is supported on this strip.
It is particularly advantageous that the characteristic light effects in the transition from the frame to the direct light surface generally formed by a prismatic disc can be generated by the solution in accordance with the invention. The light effects giving the respective lamp an esthetically particularly pleasing appearance and an appearance that can be matched to the respective use of the lamp.
The light permeable strips, preferably composed of an acrylic glass, is, in particular designed rectangular in cross-section and dimensioned such that it either terminates flush with the free end of the guide limb part or slightly projects over this free end. In the first case only the end face of the strip acting as a color filter can be seen and a soft transition of the light provided by the light strip results, which light is directed inwardly towards the large white light surface surrounded by the frame. Whereas in the second case, this means in the case where a strip slightly projects over the support limb part, the irradiated projecting region makes a slightly stronger appearance, but also in this case a soft transition of the color light into the white main light surface is obtained via the end face of the strip.
With respect to the attainment of pronounced esthetic light effects the thickness of the light permeable strip is larger than the thickness of the scattered light disc, in particular at least twice as large as the thickness of the scattered light disc irradiating the white light into the space.
The surrounding light permeable strip is preferably composed of individual mitered part strips, which are arranged without a mutual connection at the support limb part, which form a closed frame and which are centered via the miter.
In accordance with a particularly preferred embodiment of the invention, the support limb part is formed perforated, in particular regularly perforated, this means that, for example, a round hole pattern, a quadratic hole, an elongate hole or the like can be provided in the support limb part, whereby a predefinable desired transparency of the frame is achieved while using the effect of the irradiation of the color light filter strip.
From the point of view of a particularly cost-effective manufacture, the housing and the frame are preferably manufactured from, in particular lasered, chamfered sheet metal blanks welded together at the abutting edges. In order to ensure a flush alignment between the frame and a surrounding housing boundary strip, which is present in the case of an installation lamp at a respective ceiling, the free end of the guide limb part, preferably formed angled, can cooperate with an abutment in the housing interior, wherein this abutment can be formed by a separately attached strip or a corresponding angled part in the housing side wall. The small gap between the housing and the guide limb part of the frame in connection with the cooperation between the angled free end of the guide limb part and the associated abutment in the housing leads to the formation of a labyrinth seal which ensures that the lamp is practically dust-tight.
In accordance with a further variant of the invention the frame is composed of a sectional frame, in particular an aluminum sectional frame, wherein the support limb part forms a sidewall of a U-section at the light side opening outwardly and with partial light being incident via a perforation of the support limb part, whose open side acts as the lateral light exit gap. In this manner it is possible to irradiate some of the light as a small indirect light portion laterally to the ceiling, wherein the indirect light effect can also be changed and/or predefined from a color point of view through the provision of the color of the strip irradiated by the light via which the light arrives in the U-section.
Instead of the use of a uniform aluminum section it can also be advantageous to merely form the surface visible from the outside, for example, as an L-shaped aluminum section and to connect this aluminum section with the support limb part formed from sheet metal material or the guide limb part formed from sheet metal material and in this manner to form an outwardly opened U-section.
The inner wall of the section opposite the perforated support limb part for the color filter strip is so designed, for example, with reflecting fins and/or inclined surfaces, that light incident into the U-section via the irradiated color filter is guided in a direction of the opening of the U-section.
Preferably illuminants in the form of LED boards or T5 fluorescent lamps are used for the simultaneous illumination of the scattered light disc and/or the prismatic surface generally cooperating with a diffusor film.
Closure springs having run-on chamfers are provided between the housing and the frame, preferably fastened at the inner wall of the housing for the releasable latching, which closure springs engage over the angled end region of the guide limb part. Alternative coupling possibilities of a known kind are, for example, a magnetic means, which coupling possibilities can likewise be used.
It is of practical advantage to use simple tension springs and retaining springs composed of bent spring wire, which are preferably positioned in the edge regions of the frame, for the fixing of the scattered light disc and/or of the components forming the scattered light surface, as well as the light permeable strips in the frame. In this manner it is possible to simply grasp into the frame and in this connection to slightly lift the scattered light disc in the central region such that the frame can be removed against the holding force of the respectively used coupling means for the opening of the lamp.
The tension springs and retaining springs comprise two spaced apart pressing clamps supported on the scattered light disc which are connected to one another by a centering limb engaging behind the end face of the scattered light disc in the gap between frame and scattered light disc and whose free ends are clamped while producing a bias in the angled part of the end region of the guide limb part and are clamped there via the bias. In order to ensure that the frame is held at the housing on an opening of the lamp and in this connection to ensure that the entire internal space of the housing is freely accessible, a pivot and holding hinge made of two end sided angled spring steel wires is provided between the housing and the frame. The spring steel wires, on the one hand, are held in the end region of two guide limbs of the frame arranged opposite one another in longitudinal holes and, on the other hand, are guided by a bore in the abutment surface of the housing associated with the respective guide limb and are angled outwardly. This pivot and holding hinge, particularly simple from a construction point of view, is composed of two simple spring wires angled at two ends and can also be mounted problem-free. This is because the spring wires must merely be threaded into the respective bore for this purpose, whereupon, through a pivoting of the angled end, the winding provided at the oppositely disposed end is introduced into the corresponding elongate hole and an exit from the elongate holes can be locked by a backward pivot process.
A variant of the design of the lamp in accordance with the invention which, in particular can also be referred to as a further development of the invention, is characterized in that the scattered light disc, in particular composed of acrylic glass, is enclosed at its end faces by a frame and wherein a respective plurality of LEDs for the coupling of light into the end faces of the scattered light disc are provided at two opposite end faces between the frame and the scattered light disc: in that the surface opposite the light irradiating surface of the scattered light disc, as well as the two free end faces of the scattered light surface are covered with reflective means, in particular totally reflective means; and in that light permeable color strip which are at least regionally impinged with light and which surround the boundary of the light irradiating side of the scattered light surface of the border side are held by frame systems which preferably are at least partly perforated or which enable an exit light color in predefinable directions.
Further advantageous embodiments and features of the invention are described in connection with the explanation of embodiments with reference to the drawing.
In the drawing there is shown:
In the illustrated embodiment the illuminants 2 are formed by LED boards which are arranged with such a spacing with respect to the frame 3 coupled to the housing that a very uniform illumination of the overall surface of the scattered light disc 4 held in the frame 3 is obtained.
The housing 1 designed as rectangular in the present case and the associated frame 3 are cost-effectively manufactured from lasered, chamfered sheet metal blanks which are welded at the abutting edges, with the housing 1 being provided with a specific housing boundary strip 9 extending over its overall circumference intended for attachment at the ceiling 18 which boundary strip 9 is formed by a U-shaped sheet metal angle.
A surrounding abutment 8 is formed in the lateral housing walls in the housing 1 which determines the final position of the frame 3 in the coupled state, wherein the free end, in particular the free angled end of the guide limb part 5 of the frame abuts at this abutment 8. The hereby resulting narrow gap between the guide limb part 5 and the wall of the housing and/or of the abutment 8 formed by the housing and the angled end region of the guide limb part forms an effective labyrinth seal which ensures that the inner space of the lamp practically remains dust-free.
Beside the guide limb part 5 engaging in the housing, the frame 3 likewise has a surrounding support limb part 6 which is angled inwardly perpendicular with respect to the guide limb part 5 and which also forms the space sided boundary of the frame 3 and, in the state in which it is coupled to the housing 1, extends flush area-wise with the housing boundary strip 9.
A light permeable strip, for example, composed of PMMA material is arranged lying on the support limb part and indeed such that it lies in the edge region between the guide limb part 5 and the support limb part 8 and ends flush with the free end of the support limb part 6.
Preferably, the light permeable strip is composed of four chamfered part strips which are not mutually connected but rather center themselves via the miters also on heating and a corresponding expansion.
A scattered light disc 4 is arranged above the light permeable strip 7 and preferably lying directly on this light permeable strip 7 which scattered light disc 4 forms a large white uniformly illuminated light surface. This light surface is preferably formed by a prismatic surface and a thereon lying diffusor film. The scattered light disc 4 is completely impinged by the light coming from the illuminants 2, this means that in this way also the surrounding light permeable strips 7, supporting the scattered light surface 4, are correspondingly impinged with light and penetrated by radiation. As a consequence thereof characteristic light effects can be generated in the transition region between the frame 3 towards the scattered light disc 4 in dependence on the color and the thickness of the light permeable strips 7, wherein in the case of the embodiments in accordance with
The embodiment in accordance with
The final position of the frame 3 in the coupled state is in turn defined by a surrounding abutment 8 which in the present case is composed of a separate abutment element which is connected to the housing side wall and which cooperates with the angled end region 16 of the guide limb part 5. The already mentioned gap seal for ensuring the dust-free interior of the lamp is likewise provided in this case.
In comparison to the embodiment in accordance with
The embodiment shown in
A further embodiment of the invention is shown in
In the mentioned embodiment, one can possibly also omit the surrounding light permeable strip and it is further possible to design the base wall of the U-section in a perforated manner in order to subsequently realize a different colored soft-light transition adjacent to the U-section towards the scattered light disc which is brought about by a color filter strip.
The releasable latching between the frame 3 and the housing 1 is in this case realized by means of closure springs 15 which are attached at the inner sidewalls of the housing 1 and have leading ends 13, 14 for the closure and opening movement. If the frame 3 is inserted into the housing 1 then the angled end region 16 of the guide limb part 5 glides along at the inclined surface 13 presses the spring inwardly until the inclined surface 14 becomes effective and presses the biased frame against the housing abutment 8 such that the support limb part 6 of the frame lies flush area-wise with respect to the housing boundary strip 9. On an opening of the lamp, this means on withdrawing the frame, the inclined surface 14 initially becomes effective which following its maximum deflection gives the frame free towards the inside.
The part sectional illustration in accordance with
The tension and retaining springs 23 which are expediently provided respectively in the edge regions are composed of bent spring wire and comprise two spaced apart pressing clamps 25 which are supported on the scattered light disc 4 and which are connected by a centering limb 24 which engages behind the end face of the scattered light disc 4 and generally is supported at the light permeable strip 7. The ends of the pressing clamps 25 are in turn angled downwardly approximately parallel to the centering limb 24 and engage below the U-shaped angled end region 16 of the guide limb parts 5 and indeed such that the required bias is set which is required for the pressing and centering function.
Through the arrangement of the tension and retaining springs 23 merely in the edge regions of the frame a simple opening of the lamp is enabled, since the prismatic surface is only suppressed in the edge region by the spring elements in the frame and can be slightly lifted in the central region of the prismatic surface, whereby the frame can be removed from the housing by engaging the rear of the frame.
The support limb part 6 receiving the light permeable strips 7 is provided with round holes in this embodiment which enable the transition of light which irradiates the light permeable strip 7 into the U-section so that this part light of predefinable color can in turn exit laterally. The vertical limb 31 of the aluminum section 30 can likewise be perforated in the region of the light permeable strip 7 or be of shortened design so that also a soft color light transition towards the scattered light disc results.
In a perspective illustration
A bore 33 is provided in the abutment surface 8 on the housing side through which the rectangularly bent end of the spring steel wire 32 is threaded. In the upper wall as well as in the inner lying walls of the U-shaped angled end region 16 of the guide limb part 5 the elongate holes 34 for the reception of the likewise rectangularly angled ends of the spring steel wire are provided. In the functional state illustrated in the drawing the angled wire end 35 of the spring steel wire 32 extends in the direction of the frame interior and can in this manner not exit from the elongate holes 34. The angled end of the spring steel wire 32 extends in parallel to the wall of the guide limb part 3 in the direction of the housing edge at the housing side.
If the frame supporting the scattered light disc is reintroduced into the housing 1 from the pivoted holding position then the two spring steel wires 32 forming the limb are guided at the frame side into the elongate holes 34, are pushed upwardly through the bore 33 so that in the coupled state the spring steel wire 32 extends outside of the bores 33 and in parallel to the housing wall. If a complete release of the frame from the housing should take place then the spring steel wire 32 must merely be rotated by about 90° about its longitudinal axis so that the angled wire end 35 comes to lie in parallel to the elongate holes 34 and in this manner can be released from the frame.
An embodiment of the lamp in accordance with the invention which enables an absolute flat design and even enables the omission of a common housing for illuminant reception is characterized in that a light guiding disc, for example composed of an acrylic glass, is enclosed at its end faces by a frame and with a respective plurality of LEDs for the coupling of light into the end faces of the scattered light disc being provided at two opposite end faces between the frame and the light guiding disc. The light coupled into the disc at the end face distributes itself very uniformly over the entire surface, this means a constantly desired uniform illuminant distribution results over the entire surface, wherein measures can be taken in order to respectively only allow a light exit at desired regions.
In the case of a lamp irradiating one sidedly into a space the surface of the disc lying opposite the irradiating surface is covered with completely reflecting material which is preferably also attached at the free lying end faces so that the entire coupled light can be irradiated over the room-sided surface.
The surrounding boundary region of the light irradiating surface can in turn be combined in the sense of the present invention with light permeable color strips and correspondingly design of frame systems for the obtainment of particular light effects so that light color exits and light color transitions are possible in predefinable directions.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10201220754032 | May 2012 | DE | national |
