DE102011012129A1 - lighting device - Google Patents

Abstract

The present invention relates to a lighting device, in particular in the form of a ceiling spotlight, with a punctiform light source, preferably in the form of an LED, and a lens arrangement assigned to the light source. According to the invention, the lens arrangement has at least two separate, nested lens modules comprising an inner lens seated on the light source and an outer lens in a cup-shaped manner. Due to the stacked or interlocking arrangement of the inner and outer lenses, despite the large number of lenses, an overall small-sized, low-height lens arrangement can be created which, by combining different lens modules, has great variability with regard to the light distribution curves that can be generated. At the same time, a constant external appearance can be maintained, since the light distribution curves that can be generated can also be varied by combining different lens modules without varying the external appearance, since there are greater degrees of freedom with regard to the design of the lens modules.

Description

The present invention relates to a lighting device, in particular in the form of a ceiling spotlight, with a punctiform light source, preferably in the form of an LED and a lens arrangement associated with the light source.

So-called downlights or ceiling spotlights are relatively small-format spotlights that are regularly installed on or in building ceilings or ceiling panels, but may also be mounted suspended or pendulum and should illuminate a limited space as evenly as possible. With such downlights, for example, desks in work rooms can be lighted from above in a targeted and uniform manner, without disturbing the room ambience. On the other hand, such spotlights are not only used to illuminate limited areas such as desks, but often used in larger numbers to illuminate entire rooms, in which case often different areas are illuminated differently.

Due to the diverse uses of such emitters they must often meet quite different requirements in terms of lighting technology and provide different light distribution curves as required. Especially when several such downlights are combined in a uniform arrangement, for example in the form of a ceiling light field, it would be desirable to be able to provide different light distributions for different areas of space, but nonetheless to be able to maintain an overall uniform appearance of the lighting arrangement.

If such spotlights are operated with point-shaped light sources in the form of LEDs, the desired light distributions are controlled by reflectors and / or lens arrangements, which, however, are shaped in terms of their shaping by the light distributions to be achieved and thus lead to different appearances with different light distributions. In addition, such radiators with LEDs, which in themselves use the known advantages of LEDs such as low energy consumption and long lifetime, the heat or cooling problem. Since the LEDs produce relatively much heat and thus require cooling devices, different lighting tasks that require, for example, different services, lead to different sized or differently designed cooling devices, which in turn can affect the uniform appearance of such radiator arrangements.

For example, the shows DE 20 2007 007 046 U1 a recessed ceiling spotlights, for which an LED should be provided as a light source, behind the recessed in the ceiling, a reflector is arranged to selectively emit the light. In addition, over the mounting surface projecting Lichtleitringe are provided, which should divert the light emitted by the LED light not only down, but also laterally along the ceiling. Also a recessed spotlight with an LED as the light source shows the DE 20 2009 005 777 U1 , in which case the LED should be arranged in the focal point of a reflector. A seated on the reflector back heat sink is integrated in the form of a thin plate in the radiator housing, whereby a sufficient cooling capacity is possible only at lower power. Furthermore, the shows KR 100946548 B1 an LED downlight, in the reflector of which the LED is inserted from the rear.

The EP 20 31 296 A1 shows an integrated in a ceiling panel lighting device with an LED as a light source, which is preceded by a lens to completely capture the light emitted by the LED light and to focus on a focal point. As a result, the light exit opening to be provided in the ceiling panel can be made very small, since the light is focussed through. However, this design of the lighting device from the visual appearance no longer corresponds to a classic downlight. In addition, conventional mounting is not possible as with conventional downlights.

The present invention has for its object to provide an improved lighting device of the type mentioned above, which avoids the disadvantages of the prior art and further develops the latter in an advantageous manner. In particular, a small-sized radiator in the form of a downlight is to be created, which in terms of its light distribution curve in a simple manner is adaptable to different tasks and yet preserves a uniform appearance of the radiator despite different light distribution curves.

This object is achieved by a lighting device according to claim 1 and an illumination system according to claim 12. Preferred embodiments of the invention are the subject of the dependent claims.

It is therefore proposed that the lens arrangement associated with the light source can be constructed modularly in order to be able to easily exchange individual lens components and to be able to combine different lens components in a variable manner. According to the invention, the lens arrangement has at least two separate, nested lens modules comprising one on the Light source seated inner lens and a cup the inner lens cup-shaped outer lens. The inner lens does not mean the usual dome-shaped cover or coupling-out of the light source itself, but a separate from the coupling lens of the light source, switched in front of the light source lens. Due to the arrangement of the inner and outer lenses stacked one on top of the other, in spite of the number of lenses a generally small-sized, low-height lens arrangement can be created, which has a large variability with regard to the light distribution curves that can be generated by combining different lens components. At the same time a consistent, external appearance can be maintained, since the combination of different lens components, the producible light distribution curves can also be varied without varying the appearance, since there are greater degrees of freedom in terms of the design of the lens modules.

In a further development of the invention, the outer lens may be formed as a removable module, the releasable, preferably tool-free operable quick-fastening means, in particular latching locking means for locking the lens. As a result, the respective desired outer lens module can be placed in the assembly in a simple manner, but possibly also subsequently the outer lens module removed and replaced by another lens module to achieve a different light distribution curve depending on the installation situation or changing requirements.

Alternatively or additionally, the inner lens can be designed as a removable module and have similar releasable, preferably tool-free manageable quick-fastening means, so that the inner lens can be varied or changed to meet different lighting lighting tasks. Preferably, however, the interchangeability and variability of the outer lens module, since this is easier to assemble or disassemble, since no other system components need to be exchanged in advance. In particular, in production can thus be a consistent pre-assembly assembly comprising the LED and the inner lens use, then depending on the configuration requirements, the appropriate outer lens is placed.

In an advantageous development of the invention, the inner and outer lenses, viewed from their cross-sectional shapes, have different contours. In particular, can be used in one of the outer contour forth angular outer lens from the outer contour ago round, in particular circular inner lens. The meshing of angular and round lenses allows great freedom in the variation of the radiation characteristics, but above all, a favorable Aneinanderetzbarkeit multiple emitters. By a defined by the outer lens angular outer contour, for example, cubic honeycomb or honeycomb, a plurality of radiators more or less directly to each other in the manner of a light bar or light bar can be arranged, which is not the case with conventional radiators with a round outer contour.

However, such an angular outer contour is not mandatory for the outer lens. Other outer contours may also be selected depending on the application, for example free-form contours such as floral or cloverleaf contours, hybrid shapes of angular and circular contour shapes such as D-shaped or mushroom-shaped contours, contours resembling geometric basic shapes such as ovals or ellipses or other regular or irregular shapes , symmetrical or asymmetrical freeform contours. Advantageously, however, the outer lens has a regular, well-contours contour.

In particular, the outer lens has on the circumference an outer contour in the form of a regular polygon, preferably rectangles or hexagons, wherein a light exit surface forming end face, which is formed on its outer contour corresponding polygonal, is provided with a round, preferably rotationally symmetrical lens portion. In this way, despite angular outer contouring, a uniform, harmonious light distribution can be achieved.

In a particularly advantageous embodiment of the invention, the outer lens, the outer contour of a regular prism with flat side surfaces and an outside flat end face, in particular in the form of a cube, have. As a result, a multiplicity of radiators can be placed next to each other in cubes, so that there is a high degree of freedom with regard to the configuration of illumination systems, for example in the form of ceiling radiators. In particular, a plurality of radiators in the form of a row or a plurality of rows can be positioned directly next to each other, so that overall the appearance of a lamp together, wherein in an advantageous embodiment of the invention a plurality of radiators preferably have at least approximately identical outer contours differently radiating lens arrangements to different light distributions to effect. For example, in the case of a single-row line arrangement of a plurality of radiators in a corridor, it is possible for radiators arranged in the region of doors to effect a light distribution illuminating the floor in a spot-like manner in order to prevent dazzling of the persons stepping out of the door, ie radiators arranged between doors, ie Where the corridor is limited by walls, causing an asymmetrical distribution of light to illuminate the walls evenly. If, for example, a three-row ceiling spotlight arrangement is provided, the spotlights arranged in the middle row can spot-illuminate the floor, while the spotlights arranged in the left-hand row and the right-hand row are directed to the right or the left wall side. In spite of such different, symmetrical or asymmetrical emission characteristics of the lenses, the emitters may advantageously have more or less identical outer contours, so that a uniform appearance is ensured and the individual emitters in the switched-off state are not to be regarded as causing different light distributions.

Are in the aforementioned manner no angular, but round or otherwise shaped freeform contours realized on the outside of the lens, the outer contour advantageously forms a corresponding, at least approximately cylindrical body with at least approximately vertical flanks, for example in the form of a in the Cross-hatch-shaped cylinder body, here as well as in the case of the aforementioned prism body a slight oblique employment of the lateral flanks may be provided in the manner of a slight conical or pyramidal shape to act as Entformungsschräge or to simplify installation in the light carrier.

The light exit surface of the outer lens can in this case be formed by the externally flat end face of said prism or cylinder body, wherein the light entry surface of the outer lens formed from the inside of said end face and curved, for example, preferably curved rotationally symmetrical. As a result, a completely smooth, cubic structure is achieved on the outside, which allows a uniform, uniform appearance of composite emitters, on the other hand, but nevertheless achieved the desired lens effect. By varying the said light entry surface of the outer lens, different symmetrical or asymmetrical distribution characteristics can be achieved. Depending on the lighting task, instead of the rotationally symmetric curvature at the light entry surface, free-form surfaces or otherwise shaped, the desired light distribution effecting surface shapes can be realized. Nevertheless, advantageously, the different outer lenses, whose light entry surface varies from one another, have the same outer dimensions and contours, so that the outer appearance of corresponding illumination systems remains uniform, even if the individual radiators provide different light distributions.

Due to the modular design of the radiator and multiple radiator comprehensive radiator arrays or arrangements can be realized, which reduce the glare. Instead of a single radiator, which must provide a corresponding high light intensity, many fuzzier lamps can be used, which reduce the dazzling effect, but nevertheless provide the necessary light intensity in total.

The inner lens may basically have various shapes and shapes. In an advantageous embodiment of the invention, the inner lens - roughly speaking - be a cup-shaped solid material body, the light source side may have a napf- or blind hole-like Lichteintrittsausnehmung that defines a cavity in which the light source is arranged. The entry surfaces of the inner lens formed by the blind-hole-like light entry recess advantageously direct at least a portion of the incoming light onto the outer surface of the lens, which is designed to be totally reflective or mirrored in order to direct the light from the outer surface onto the light exit surface of the lens. The light exit surface is in this case formed by the end face of the inner lens, which is opposite to the aforementioned Lichteintrittsausnehmung.

In order to achieve a good mixing of the light, for example, to avoid light spots or color spots on the surface to be irradiated, the aforementioned Lichteintrittsausnehmung may have a central entrance surface area, which directs the light entering there directly to the light exit surface of the lens, while a to the central entrance surface area adjacent outer entrance surface area directs the light in the aforementioned manner on the lateral surface. Advantageously, in this case the light inlet recess and the lateral surface are configured such that the light beams directed directly onto the light exit surface and the light beams deflected on the lateral surface cross over before reaching the light exit surface. In order to enhance this effect of the mixing, in an advantageous embodiment of the invention, the lateral surface of the lens and / or the aforementioned central entrance surface may be provided with a surface structuring in the form of a faceting comprising a plurality of facets. The facets can advantageously be designed such that the light beams deflected by the lateral surface cross one another before reaching the light exit surface and / or the light beams directed from the entry surface directly to the light exit surface also cross each other before reaching the light exit surface.

The inner lens and / or the outer lens may vary depending on the illumination task to be performed and the light distribution characteristic have different shapes and contours, for example, as a freeform lens, asymmetric radiating freeform lens, be formed.

In order to achieve a simple assembly and configurability with a simultaneously small-sized lens arrangement, a common lens holder for the lens components of the lens arrangement is provided in development of the invention, on which the inner lens and the outer lens are mounted. Preferably, the common lens holder in this case has inner and outer retaining surfaces or elements, so that in an advantageous embodiment of the invention, the outer lens on an outer peripheral surface of the lens holder and the inner lens on an inner peripheral surface or a projecting from the inner peripheral surface surface approach can be stored. The common lens holder thus advantageously extends between the inner lens and the outer lens placed over it and holds the two lenses in exact position with respect to one another. In this way, with a compact arrangement, easy installation and with few components, an exact positioning of the two lens components can be achieved relative to each other.

In an advantageous embodiment of the invention, the lens holder is formed overall sleeve-shaped, wherein it may have on the one hand on its outer peripheral surface latching means, for example in the form of a locking groove or a projecting locking bead for the outer lens and on its inner peripheral surface positioning and / or attachment means for the inner lens.

Advantageously, said lens holder is also used for holding a cooling module provided on the rear side of the LED. For this purpose, the lens holder can comprise a holding section protruding above the light source, preferably likewise sleeve-shaped, for holding the supply and / or cooling module.

In order to ensure a simple assembly, it is advantageous if the lens holder in a further development of the invention has an insertion recess open towards the back of the light source through which the inner lens is pushed from its rear side to its intended desired position within the lens holder can, and further to the front has projecting holding means, preferably in the form of a sleeve-shaped holding portion to attach the outer lens from a front side can.

To summarize a plurality of radiators to a radiator array, easy to assemble and to be able to arrange close to each other, is provided according to a further aspect of the present invention to arrange a plurality of radiators of the type described above on a common carrier in a preferably regular grid. The common carrier in this case advantageously comprises a number of Durchsteckausnehmungen corresponding to the number of radiators, which is adapted in each case to the non-circular, in particular rectangular outer contour of the outer lens. In particular, all Durchsteckausnehmungen are contoured equal, even if emitters are stored with different light distribution characteristics on the same carrier. The different, symmetrical or asymmetrical light distributions are achieved via differently contoured lenses, which nevertheless have the same outer contour to which the passage openings are adapted.

The invention will be explained in more detail with reference to preferred embodiments and associated drawings. In the drawings show:

1 : A top view of grid-mounted ceiling spotlights according to an advantageous embodiment of the invention, wherein the grid-shaped ceiling lights are mounted on a common Trägerpaneel, wherein in the partial view (a) four in-ceiling mounted spotlights and in the partial view (b) nine in one square grid mounted ceiling spotlights are shown

2 : an exploded perspective view of one of the ceiling spotlights 1 showing the two lenses of the lens array, the intermediate lens carrier and the LED,

3 : A side view of the lens assembly 2 in exploded view,

4 FIG. 3 is a sectional view of the lens assembly taken along the line A - A in FIG 3 in which the outer lens has a concavely curved light entry surface on its central inner side,

5 : An exploded view of the lens arrangement of another radiator 1 in a view similar to the one 3 and 4 , wherein the partial view (b) shows a substantially flat light entry surface of the outer lens and in comparison to the 3 and 4 an identically formed outer contour of the outer lens can be seen,

6 : An exploded view of the lens arrangement of another radiator 1 in a view similar to the one 3 and 4 , wherein the partial view (b) shows a substantially slightly concave curved light entry surface of the outer lens and compared to the 3 and 4 an identically formed outer contour of the outer lens can be seen, and

7 : A sectional view through two radiators in the mounted, assembled state.

The embodiment of the lighting device shown in the figures 1 is designed as a downlight or installable Deckenstrahleranordnung that according to partial view (a) in the illustrated embodiment four in series juxtaposed ceiling spotlights or according to partial view (b) includes nine arranged in a square grid ceiling spotlights, each on a common, panel-shaped carrier 21 are stored, which is mounted on the ceiling. As 1 shows, the ceiling spotlights with their visible outer contour are cubic or square in plan view, so that the ceiling spotlights can be arranged close together. The panel-shaped carrier 21 includes four Durchsteckausnehmungen according to the number of ceiling spotlights 22 , which are adapted to the outer contour of the ceiling spotlights, in particular square.

As the 2 to 4 show, each ceiling spotlight includes a light source 2 in the form of an LED, which in a conventional manner have an approximately hemispherical coupling-out lens and can be mounted on a printed circuit board which serves to drive and power the LED.

The light source 2 is a lens arrangement 3 upstream, which consists of two nested lenses. As the 2 and 7 show, an inner lens sits 4 essentially immediately at the light source 2 to the entire light of the light source 2 capture and from the light source 2 directed to radiate or on a second, outer lens 5 to steer, which then finally determines the emission cone of the radiator.

The named inner lens 4 can advantageously - roughly speaking - paraboloidstumpfförmig be formed and arranged with its light entry side sitting directly on the aforementioned circuit board or positioned, wherein the lens 4 Here may also be slightly spaced from the LED supporting circuit board.

The inner lens 4 includes on its light entrance side via the coupling lens of the light source 2 inverted, blind hole-like Lichteintrittsausnehmung 12 that defines a cavity in which the light source 2 is arranged, cf. 7 , The light entry recess 12 can advantageously be divided into two surface areas, wherein a central entrance surface area 14 the bottom of the blind hole-like Lichteintrittsausnehmung 12 forms and is slightly convex curved in the illustrated embodiment.

The edge of the central entrance surface area 14 adjacent outer entrance surface area 15 forms an inner circumferential surface of the Lichteintrittsausnehmung 12 and is slightly conical spread in the illustrated embodiment, so that the Lichteintrittsausnehmung 12 from the light source 2 to the central entrance area 14 rejuvenated.

The said light entry recess 12 opposite, the lens body made of a transparent solid material of the inner lens comprises a light exit surface 13 which is the opposite end of the lens 4 forms and is flat in the illustrated embodiment, but may also be cup-shaped convex or concave. While the said light exit surface 13 is preferably smooth and formed without surface structuring, the lateral surface 16 that is between the light exit surface 13 and the light entrance recess 12 the Lens 4 limited on the periphery, be formed with a surface structuring, for example, a variety of facets. Viewed in cross-section is the said lateral surface 16 slightly convex, cf. 3 ,

The outer lens 5 is cubic or cuboid-shaped from its entire body and comprises four right-angled side flanks, which can be slightly inclined, deviating from an exact cuboid, cf. 3 so that the outer lens 5 to her front 8th slightly rejuvenated.

On her the inner lens 4 facing end face comprises the outer lens 5 an approximately circular recess 23 through which the inner lens passes 4 can be pushed through with its body, so that, cf. 7 , the light exit surface 13 the inner lens 4 inside the cubic body of the outer lens 5 to come to rest.

The outer lens 5 owns it on its outer front side 8th , which is externally contoured rectangular, a central, round lens section 9 , which has a curved light entry surface 11 and a substantially planar light exit surface 10 includes. In the execution after 4 is the aforementioned light entry surface 11 the outer lens 5 relatively strongly concave, wherein the central light entry surface portion is still associated with an outer, annular region. Like the alternative embodiments 5 and 6 can show the outer lens 5 with otherwise unchanged outer contouring and dimensioning but also flat light entry surfaces 11 own, cf. 5 , or even slightly concave light entry surfaces 11 , see. 6 , About the variation of said light entry surface 11 the outer lens 5 the radiation characteristic can be varied without the outer contouring and dimensioning of the lens arrangement 3 to change.

The two lenses 4 and 5 this sit advantageously on a common lens holder 17 , the overall considered - roughly speaking - is sleeve-shaped. At a forward projecting holding section 19 is the outer lens 5 fastened, advantageously the outer lens 5 on an outer peripheral surface of the lens holder 17 sitting. The forward projecting holding section 19 of the lens holder 17 In this case, in the illustrated embodiment, latching projections which engage in a latching groove on the inner peripheral surface of the outer lens 5 can snap in and with these together latch locking means 6 form.

The inner lens 4 is advantageously located on an inner peripheral surface of the lens holder 17 or from there inwardly projecting retaining bar. The inner lens 4 can from a back into the inner recess of the lens holder 17 be inserted, this purpose a rearwardly open Einschubausnehmung 20 which is sized such that the inner lens 4 can be inserted. The rearward projecting holding section 18 of the lens holder 17 can be at the back of the light source 2 pick up arranged blocks, for example cooling blocks or supply modules, cf. 7 , which are in said insertion recess 20 to sit.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 202007007046 U1 [0005]
• DE 202009005777 U1 [0005]
• KR 100946548 B1 [0005]
• EP 2031296 A1 [0006]

Claims (14)

Lighting device, in particular ceiling spotlight, with a punctiform light source ( 2 ) preferably in the form of an LED and one of the light source ( 2 ) associated lens arrangement ( 3 ), characterized in that the lens arrangement ( 3 ) at least two separate, nested lens modules comprising one at the light source ( 2 ) seated inner lens ( 4 ) as well as the inner lens ( 4 ) cup-shaped outer lens ( 5 ) having. Lighting device according to the preceding claim, wherein the outer lens ( 5 ) is designed as a removable module, the releasable quick-fastening means, in particular locking locking means ( 6 ) for locking the lens ( 5 ), having. Lighting device according to one of the preceding claims, wherein the outer lens ( 5 ) a preferably non-circular outer contour ( 7 ) having in cross-sectional shape the cross-sectional shape of the inner lens (FIG. 4 ) deviates. Lighting device according to one of the preceding claims, wherein the outer lens ( 5 ) has an outer contour on the circumference in the form of a regular polygon, in particular a rectangle or hexagon, wherein an end face forming the light exit surface (FIG. 8th ) of the outer lens ( 5 ) with a round, preferably rotationally symmetrical lens section ( 9 ) is provided. Lighting device according to the preceding claim, wherein the outer lens ( 5 ) has the outer contour of a regular prism with flat side surfaces and an outside flat end face, wherein the outside flat end face the light exit surface ( 10 ) of the lens arrangement ( 3 ) and on the inside of said end face ( 8th ) a curved light entry surface ( 11 ) of the outer lens ( 5 ) is provided. Lighting device according to one of the preceding claims, wherein the inner lens ( 4 ) a cup or blind hole-like Lichteintrittsausnehmung ( 12 ) has at least a portion of the incoming light of the light source ( 2 ) on a totally reflective and / or mirrored trained lateral surface ( 12 ) of the inner lens ( 4 ), which in turn direct the light onto a light exit surface ( 13 ) which deflects one of the light entry recesses ( 12 ) opposite end face of the inner lens ( 4 ). Lighting device according to the preceding claim, wherein the light entry recess ( 12 ) of the inner lens ( 4 ) a central entrance surface area ( 14 ), the light entering there directly to the light exit surface ( 13 ) of the inner lens ( 4 ), and an outer entrance surface area ( 15 ), which transmits the light entering there to the totally reflecting and / or mirrored outer surface ( 16 ) of the inner lens ( 4 ) steers. Lighting device according to one of the two preceding claims, wherein the lateral surface ( 16 ) and / or the central entrance surface area ( 14 ) of the inner lens ( 4 ) is provided with a variety of facets. Lighting device according to one of the preceding claims, wherein the inner lens ( 4 ) and the outer lens ( 5 ) on a common, preferably sleeve-shaped, lens holder ( 17 ), the outer lens ( 5 ) with an outer peripheral surface of the lens holder ( 17 ) and the inner lens ( 4 ) with an inner circumferential surface of the lens holder ( 17 ) is engaged. Lighting device according to the preceding claim, wherein the lens holder ( 17 ) a rear side over the light source projecting, preferably sleeve-shaped, holding section ( 18 ) for holding a supply module of the light source ( 2 ). Lighting device according to one of the two preceding claims, wherein the lens holder ( 17 ) one to the back of the light source ( 2 ) open Einschubausnehmung ( 20 ) for inserting the inner lens ( 4 ) has a rear side and to the front projecting holding means, preferably in the form of a sleeve-shaped holding portion ( 19 ), for attaching the outer lens ( 5 ) has from a front side. A lighting system comprising a plurality of lighting devices according to any one of the preceding claims, wherein the plurality of lighting devices ( 1 ) on a common carrier ( 21 ) are arranged in a preferably regular grid. Lighting system according to the preceding claim, wherein the plurality of lighting devices ( 1 ) differently shaped, asymmetrically or symmetrically radiating lens arrangements ( 3 ), in particular differently shaped outer lenses ( 5 ), the outer lenses ( 5 ) have at least approximately mutually identical outer contours. Illumination system according to one of the two preceding claims, wherein the support ( 21 ) is panel-shaped and Durchsteckausnehmungen ( 22 ), which are connected to the non-round, preferably rectangular or hexagonal, outer contour of the outer lenses ( 5 ) is adjusted.

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