DE102011115947A1 - Lamp for fastening to building ceiling, has strip-shaped function optic unit i.e. Fresnel plate, extending over light width of profiled rail in longitudinal direction and inserted into grooves opened to each other - Google Patents

Abstract

The lamp has LEDs staying in heat conductive contact and extending in a longitudinal direction. A rectangular housing (1) has a base plate (2) that exhibits a U-shaped profiled rail (16). The profiled rail is provided with profile walls projecting from a profile bottom such that the profiled rail supports the LEDs. The profile walls comprise module grooves opened to each other. A strip-shaped function optic unit (21) i.e. Fresnel plate, extends over light width of the profiled rail in the longitudinal direction and is inserted into the grooves.

Description

The invention relates to a luminaire having a housing with a bottom plate, with which a plurality of light-emitting diodes arranged in a longitudinal direction are in a heat-conducting contact and having a strip-shaped common functional optics for directing the light emitted by the light-emitting diodes.

The use of light-emitting diodes is constantly increasing because light-emitting diodes are considered to be energy-saving and environmentally friendly due to their high efficiency in the conversion of electrical energy into light energy. In addition, they can be easily switched on and off and in this regard also offer advantages over - also energy-saving - fluorescent tubes. LEDs are therefore increasingly used as a replacement for fluorescent lamps, so for example in the realization of linear luminaires. In this case, the light-emitting diodes are arranged extending in a longitudinal direction. This term covers an arrangement in which light-emitting diodes are arranged one behind the other along a straight line in the longitudinal direction, but also arrangements in which the light-emitting diodes are arranged one behind the other in the longitudinal direction but transversely offset from one another. Furthermore, arrangements are recorded in which the light-emitting diodes are arranged on two or more straight lines one behind the other, wherein the extent of the light-emitting diode arrangement in the longitudinal direction is greater than the extent in the transverse direction. The light-emitting diode arrangement is therefore similar to the dimensions of a fluorescent tube whose length is always substantial (i.e., more than 10 times as large) as the diameter.

Light-emitting diodes are often supplied by the manufacturer with an integrated converging lens. However, for the increase of the efficiency often LEDs are also used, which consist only of the radiating semiconductor chip, so are not equipped with its own convergent lens. Both types of light emitting diodes are useful in the present invention.

For lights of the type mentioned above, it is through EP 2 208 988 A1 known, all extending in the longitudinal direction arranged light-emitting diodes assign a common functional optics, which may consist of a strip-shaped Fresnel plate. This has the function of directing or focusing the light emitted by the light-emitting diodes on a surface to be illuminated. Each light-emitting diode has its own lens with which the light of the relevant light-emitting diode is directed onto the common Fresnel plate.

The present invention has for its object to provide a simple to manufacture and manageable structure of such a lamp.

This object is achieved according to the invention in a lamp of the type mentioned, the bottom plate has a substantially U-shaped rail, which is provided with a profile bottom and two rising from the profile floor profile walls, that the rail carries the light-emitting diodes, and that the profile walls have mutually open insertion grooves, in which over the clear width of the rail in the longitudinal direction extending strip-shaped functional optics is inserted.

The luminaire according to the invention thus provides that the light-emitting diodes are arranged within the profile rail, for example on a common board, which also contains the necessary connection lines, for example in printed form. In addition, the profiled rail has a guide through which mutually facing open insertion grooves into which the strip-shaped functional optics can be inserted. The attachment of the strip-shaped functional optics therefore takes place in a simple manner by the insertion into the rail. Preferably, the grooves and the strip-shaped functional optics are dimensioned so that a dust-proof encapsulation within the profile rail, for example, according to protection IP 65, is achieved. For this purpose, of course, the end faces of the open rail must be closed in a suitable manner by closing elements. The profile rail may have mutually parallel, perpendicular to the profile bottom extending side walls. The side walls can also be arched. The profile rail can be fastened with its profile bottom to the bottom plate. In another embodiment, the base plate is already formed as a profile rail or floor plate and rail are integral. In all cases, the rail may be provided with outwardly projecting profile ribs in order to realize an effective dissipation of the heat generated by en LEDs,

The strip-shaped function optics has the task of influencing the emission characteristics of the luminaire. By using a first functional optics, the luminaire can be set up as narrowly radiating so that a small radiation angle results in a plane perpendicular to the longitudinal direction. By using a different functional optics, the luminaire can be adjusted to a wide beam, so that the beam angle in the mentioned plane is significantly larger. A corresponding narrowing or widening of the emission angle can also be effected by the functional optics in the longitudinal direction of the luminaire. Furthermore, it is possible to make an asymmetrical steering of the light by the functional optics. The functional optics Thus, the light can focus or widen and / or direct to a surface to be illuminated. The individual light-emitting diode can be equipped with or without its own lens.

The change in the emission characteristics of the luminaire is achieved by a mere replacement of the functional optics. If the luminaire has a reflector in a preferred embodiment, it must be changed in order to change the emission characteristic. The advantage of the luminaire according to the invention is therefore that emission characteristics can be adjusted in a simple manner by replacing the functional optics and that the replacement of the functional optics is possible in a simple manner, since they are merely inserted into the rail.

In a preferred embodiment of the invention, the housing with the bottom plate and four side walls of equal height forms a rectangular box which is open on one side and can be closed, preferably sealed, by means of a lid which has a transparent pane and is pivotably mounted on a side wall. In this way, a lamp can be realized, which is dust-proof, for example, according to protection IP 65.

In a further preferred embodiment, at least one plate bent parallel to the longitudinal direction and having a reflective surface as reflector on both sides of the light-emitting diodes is located between the bottom plate and the transparent pane. The reflector can be used in support of the functional optics to increase the light output for the desired lighting purposes.

In addition, a holder can be provided for an across the width of the housing transverse to the longitudinal direction extending optical disc. This optical disk can be, for example, a prismatic screen with which the emitted light can be influenced again. Thus, it is possible by different prismatic disks to realize a symmetrical radiation of the lamp, but to allow by another optical disk, however, an asymmetric radiation with which, for example, a combined wall and floor lighting can be realized. Furthermore, such an optical disc, in particular prismatic disc, serve for all-round glare reduction. The holder may preferably be formed on the reflector, since the optical disk preferably extends over the width of the reflector.

It is useful if the preferably used in the reflector optical disc is located near the transparent writing of the housing, the luminaire according to the invention may thus consist in a preferred embodiment of the light-emitting diodes built without their own lenses whose emitted light bundled only by a common functional optics and being judged. For this purpose, the functional optics is inserted in the form of a strip-shaped disc near the LEDs in the rail. A steering of the emission direction then takes place by means of a common optical disc, which is kept interchangeable near the transparent plate of the lid of the housing in the reflector.

The transparent pane can, in particular at its longitudinal edges, preferably be provided with a glare relief, which prevents the lateral expression of any stray light from the luminaire and, moreover, ensures that from the outside an insight into the interior of the luminaire only in the area of the reflector is possible, so that the existing in the interior of the lamp mechanical and electrical components are not visible.

In a preferred embodiment of the invention, the bottom plate at least partially on the other housing walls increased material thickness, so that the bottom plate also serves as a heat sink for dissipating the heat generated by the LEDs. In this case, the increased material thickness of the bottom plate in a preferred embodiment may have longitudinally extending fastening channels in the longitudinal direction, so that the profile rail is fastened in at least one of the fastening channels.

The present invention is not limited to the use of a single rail. Rather, it is possible to use two or more rails to achieve a higher illuminance. Each profile rail is provided with a common function optics for the light-emitting diodes contained in it. However, the reflector and the optical disk are effective together for all rails.

The invention will be explained in more detail below with reference to an embodiment shown in the drawing. Show it:

1 a perspective view obliquely from below of a lamp according to the invention in a housing, with the lid open;

2 a cross section through the lamp according to 1 ;

3 a perspective view obliquely from below the lamp according to 1 with lid closed;

4 a cross section through the lamp according to 3 ;

5 a schematic longitudinal section through a first embodiment of a functional optics;

6 a schematic cross section through a second embodiment of a functional optics;

7 a schematic longitudinal section through a third embodiment of a functional optics together with a schematic representation of a plan view;

8th a schematic cross section through a designed as a Fresnel lens functional optics.

The in the 1 to 4 illustrated light represents an embodiment of the invention. It has a rectangular housing 1 on, the one, for example, suitable for attachment to a building ceiling suitable base plate 2 , two longitudinal side walls 3 and two end walls 4 having. The side walls 3 . 4 have a same height, so that in the assembled state, a downwardly open square box is formed by a lid 5 is closable. The lid 5 is on a long side wall 3 pivotally hinged and consists of a metallic frame 6 in which a transparent pane 7 is held. The side walls 3 . 4 are with inwardly directed, approximately right-angled bends 8th provided and form to the open side of the box out a peripheral edge, in which a circumferential seal 9 is stored. In the closed state of the housing is the transparent disc 7 on the circumferential seal 9 on, how 4 can be seen.

The transparent pane 7 is at its in the longitudinal direction of the housing (parallel to the longitudinal side walls 3 ) lying edges with a print 10 provided, which serves both for glare with respect to the radiated light and for optical coverage of the interior of the housing at the longitudinal edges.

The metallic frame 6 of the lid 5 has at its free longitudinal edge, which is not pivotally connected to a longitudinal side wall 3 is articulated, a recess 11 in which a Rastabwinkelung 12 with an angled locking hook 13 engages, which is provided with a correspondingly formed locking projection. The Rastabwinkelung is on the longitudinal side wall 3 pivotally mounted, the longitudinal side wall 3 opposite to the lid 5 is articulated. The pivotable storage is located on the longitudinal side wall 3 at the height of the base plate 2 ,

The bottom plate 2 and the side walls 3 . 4 are firmly connected, with the bottom plate 2 with the two longitudinal side walls 3 is designed as an extruded profile, which is the corresponding receptacles for the pivot bearing of the lid 5 and the Rastabwinkelung 12 having. The two front side walls 4 are sealed with the appropriately cut longitudinal side walls 3 screwed.

The bottom plate 2 has a central material thickening 14 on, which thus forms a heat sink. In the material thickening there are screw channels 15 , For example, have the cross-sectional shape of an upside down T, so that in the screw 15 Screw heads of a screw are movable, with bolts from the screw 15 protrude. At the material thickening are in the illustrated embodiment, two in the longitudinal direction of the housing 1 extending profile rails 16 attached. The two profile rails extend in the longitudinal direction symmetrically to a longitudinal center axis of the housing 1 so objects on the bottom plate 2 can hold by a screw connection. The screw channels 15 extend over the longitudinal direction of the housing. With the help of the screw channels 15 are in the area of material thickening 14 the bottom plate 2 two profile rails 15 symmetrical to a longitudinal center axis of the housing 1 attached. The profile rails have the shape of a downwardly open U, formed from a profile bottom 17 and profile walls 18 , When fastened, the outside of the profile floor is located 17 on the surface of the material thickening 14 flat, so that good heat transfer is guaranteed. This is the profile rail 16 preferably made of a metal, in particular aluminum.

The 2 and 4 let recognize that on the profile floor 17 a strip-shaped longitudinally extending board 19 is arranged on the light emitting diodes 20 in the longitudinal direction of the housing 1 are mounted one behind the other. In the presentation of the 2 and 4 the LEDs shine 20 down, so through the open side of the U-shaped rail 16 ,

In the area of the free ends of the profile walls 18 have these inwardly, ie to each other, directed open grooves, into which a flat, extending over the length strip-shaped functional optics 21 is inserted.

The profile rails 16 pointing to the outsides of the profile walls 18 outwardly open grooves 22 on, in the one end one as parallel to Longitudinal axis of the housing 1 beveled sheet formed reflector 23 protrudes. The reflector has one to the rails 16 directed reflective. Surface on. An end piece of the reflector 23 runs parallel to and immediately below the transparent pane 7 in the closed state of the lid 5 ( 4 ). This end is at the fold 8th the side wall 3 attached. Such reflector sheets are located on both sides of the LEDs 20 or profile rails 16 , Between the profile rails 16 is an approximately V-shaped sheet metal as another reflector part 24 with the profile rails 16 in the same way, ie via grooves 22 , connected.

The 2 and 4 Let's recognize that another beveled sheet metal 24 may be provided as an optical cover, if a reflector 23 not used.

The reflector carries in the illustrated embodiment, an optical disc 25 , which may be formed for example as a prismatic disc and in particular serves to direct the emitted light. With the optical disc 25 In particular, a symmetrical or asymmetrical beam angle in a direction perpendicular to the longitudinal axis of the housing 1 standing level. Also the optical disc 25 is easily interchangeable with the reflector 23 held, so that the corresponding radiation characteristic by replacing the optical disc 25 can be easily changed.

In the drawing, the electrical and mechanical components contained in the lamp, such as power supply, terminal, are shown only schematically. They are especially in the area near the side walls 3 housed as this area through the sheet 24 is easily covered and also on the transparent pane 7 through the strip-shaped imprint 10 can be made invisible from the outside.

The aesthetically pleasing appearance of the case 1 the lamp contributes that the Rastabwinkelung 12 over the entire longitudinal side wall 3 extends and thus not recognized with its locking function from the outside. The Rastabwinkelung 12 thus provides a second part of a double longitudinal side wall 3 Through a corrugation of Rastabwinkelung 12 In addition, a special esthetically effective effect may result.

The 5 to 8th show schematically illustrated embodiments for an optical disc 25 or a functional look 21 , which is housed easily replaceable in the lamp according to the invention, in order to be able to form different emission characteristics in a simple manner.

5 shows a disc 25 , one the light emitting diodes 20 facing smooth surface 26 and one of the light emitting diodes 20 remote surface 27 a crease 28 has symmetrical triangles. The crease 28 runs transversely to the longitudinal direction of the housing 1 and results in a glare in the longitudinal direction in a manner known to those skilled in the sequence. The crease 28 causes a constriction of the light cone in the longitudinal plane of the lamp as a result, so that a glare when approaching the housing 1 longitudinally later than without the optical disc 25 with the in 5 shown grooving 28 ,

In the 6 illustrated optical disc 25 also has one of the light emitting diodes 20 facing smooth surface 26 on, on the opposite surface 27 however, an asymmetrical, sawtooth-shaped groove 29 , From the LED to the surface 26 incident light is caused by the scoring 29 in the presentation of the 6 deflected to the left as the light is refracted away from the optical axis as it enters the air (lower refractive index). If the grooves of the grooving 29 extend in the longitudinal direction, thus resulting in a deflection of the light emitted by the light mainly to the left, seen in the longitudinal direction. The symmetrical cone of light radiated from the luminaire due to its symmetrical construction is thus transmitted through the optical disc 25 with the crease 29 deformed into an asymmetrical cone of light, which in the view of the 6 is pivoted to the right. Such an optical disc can therefore for a glare on one side (in 6 on the right), while on the left side there is an increased radiation, for example against a wall to be moistened.

7 again shows an optical disk 25 with one to the light emitting diodes 20 smooth upper side 26 , The opposite surface 27 is with conical prisms 30 formed, for example, with a hexagonal boundary honeycomb-shaped abut each other and the surface 27 completely cover. With these prisms, glare reduction in all directions is possible in a manner known to those skilled in the art, because the conical prisms cause a blinding deflection of the light in all directions. The prisms 30 have a truncated cone shape starting from a hexagonal plan 31 and a flattened top 32 on. Such prismatic disks are known as CDP (Conic De-glaring Prism).

8th shows an example of a functional appearance 21 , one to the light-emitting diodes 20 flat surface 32 has and with lateral approaches 33 for insertion into grooves 22 having. The top 32 opposite surface 34 is as linear Fresnel lens in the longitudinal direction of the housing 1 aligned creases 35 educated.

Such a Fresnel lens acts in particular as a collimator for the light-emitting diodes 20 emitted light.

It is understood that as a functional appearance 21 shown Fresnel lens as an optical disk 25 can be used. Likewise, the embodiments of the optical disk 25 according to the 5 to 7 also as a functional look 21 be used.

The in the 5 to 8th illustrated embodiments of the optical disk 25 or the functional optics 21 are illustrative examples. They can readily be varied by those skilled in the art to produce desired radiation and focusing characteristics. The inventive construction of the lamp, the variations by replacing the functional optics 21 or the optical disk 25 unproblematic and executable without significant interference in the structure of the lights.

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

• EP 2208988 A1 [0004]

Claims (11)

Luminaire with a housing ( 1 ) with a bottom plate ( 2 ), with which a plurality of light emitting diodes ( 20 ) are in a thermally conductive contact, and with a strip-shaped common functional optics ( 21 ) for directing the light emitting diodes ( 20 ) radiated light, characterized in that the bottom plate ( 2 ) a substantially U-shaped profile rail ( 16 ) having a profiled bottom ( 17 ) and two from the bottom of the profile ( 17 ) elevating profile walls ( 18 ) is provided that the profile rail ( 16 ) the light-emitting diodes ( 20 ) and that the profile walls ( 18 ) mutually open insertion grooves ( 22 ), in which the over the clear width of the rail ( 16 ) longitudinally extending strip-shaped functional optics ( 21 ) is inserted. Luminaire according to claim 1, characterized in that the housing ( 1 ) with the bottom plate ( 2 ) and four equally high side walls ( 3 . 4 ) forms a one-sided open rectangular box with a transparent disc ( 7 ), pivotally mounted on a side wall ( 3 ) mounted lids ( 5 ) is closable. Luminaire according to claim 2, characterized in that between the bottom plate ( 2 ) and the transparent pane ( 7 ) at least one folded parallel to the longitudinal direction sheet with a reflective surface on both sides of the light-emitting diodes ( 20 ) as a reflector ( 23 ) is used. Luminaire according to claim 3, characterized in that a holder for a across the width of the housing ( 1 ) extending transversely to the longitudinal direction optical disc ( 25 ) is trained. Luminaire according to claim 4, characterized in that the optical disc ( 25 ) near the transparent pane ( 7 ) of the housing ( 1 ) is arranged. Luminaire according to claim 4 or 5, characterized in that the optical disc ( 25 ) is a prismatic lens for lateral alignment of the light across and / or in the longitudinal direction. Luminaire according to one of claims 1 to 6, characterized in that the functional optics ( 21 ) as a strip-shaped Fresnel disc with longitudinally aligned lens stages. Luminaire according to one of claims 1 to 7, characterized in that the bottom plate ( 2 ) at least partially opposite the other housing walls ( 3 . 4 ) a material thickening ( 14 ), so that the bottom plate ( 2 ) at the same time as a heat sink for the derivation of the light-emitting diodes ( 20 ) generated heat is used. Luminaire according to claim 8, characterized in that in the material thickening ( 14 ) of the bottom plate ( 2 ) extend in the longitudinal direction through continuous mounting channels and that in at least one of the mounting channels ( 15 ) the profile rail ( 16 ) is attached. Luminaire according to one of claims 1 to 9, characterized in that at least two profiled rails ( 16 ) with light-emitting diodes ( 20 ) on the bottom plate ( 2 ) are attached. Luminaire according to one of claims 1 to 10, characterized in that the light-emitting diodes ( 20 ) are constructed without their own lens and that of the light-emitting diodes ( 20 ) radiated light only by a common functional optics ( 21 . 25 ) being affected.

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