DE102008052869B4 - Luminaire with LED mounting rail - Google Patents

Abstract

Luminaire (1) with one or more mounting rails (6) for holding at least one LED (4) each, the one or more LEDs (4) each being assigned to a housing (18, 18 ') which is the LED (4) surrounds, and the housing (18, 18 ') is releasably attached to the mounting rail (6), wherein: one of the LEDs (4) or a group of LEDs (4) is arranged on a circuit board (8) or ., The circuit board (8) is arranged between the LED (s) (4) and a contact surface (12) of the mounting rail (6), the housing (18, 18 ') on the circuit board (8) by means of the Housing (18, 18 ') associated LED (4) is held, and / or the housing (18') comprises a device for receiving an optics for the LED assigned to the housing, the optics in different orientations on the housing (18 ' ) can be attached.

Description

The present invention relates to a luminaire with LEDs (light-emitting diodes) as lighting means.

The development of high-intensity LEDs has made it possible to construct both indoor and outdoor luminaires based on LED technology as a light source. By using several LEDs even street lights can be produced.

The disadvantage of the particularly bright LEDs, however, is that they produce a considerable amount of heat during operation, similar to conventional bulbs, which must be dissipated by the light. If the cooling is insufficient, the luminous flux generated by the LED is reduced. With even more heating, the LED may fail or at least prematurely age. Even if sufficient cooling of the LEDs is ensured within the luminaire, it is almost inevitable that the LEDs must be replaced from time to time.

It would therefore be desirable to arrange the LEDs as freely as possible, so that the cooling is ensured by the ambient air and the LEDs are accessible for replacement. However, the arrangement of LEDs on lights are limited by the desired light distribution to be achieved. An LED emits its light approximately like a Lambert radiator. In order to achieve a specific lighting task, it is therefore often necessary to provide light-directing devices on the LED in order to focus or widen the light in relation to the Lambert radiation characteristic.

The Utility Model DE 20 2007 016 530 U1 discloses an electric lamp for increased protection. The luminaire in this case comprises a heat sink on which at least one LED illuminant is mounted. The illuminant is covered with a sealing cap, which includes a base and a transparent cap. The attachment of the sealing hood on the heat sink by means of locking devices, clamps or screws. There is also a seal between the sealing cap and the heat sink.

The Utility Model DE 20 2007 011 385 U1 discloses an LED lamp device comprising a lamp bearing. By deepening inward in the lamp bearing an arcuate lamp pan is formed. In the lamp pan, a plurality of lamp groups are arranged, wherein in each lamp group, a plurality of LEDs is present. The arch shape focuses the light of the luminaire.

Object of the present invention is to provide a lamp of the type mentioned above, which is optimized in terms of cooling of LEDs and the handling of the lamp to replace the LEDs, without having to accept disadvantages in terms of the desired light distribution in purchasing.

The invention achieves the object by the luminaire according to claim 1. Preferred embodiments are described in the subclaims. By arranging the LEDs on one or more mounting rails of the lamp, the heat produced by the operation of the LEDs can be dissipated via the mounting rail. On the other hand, it is possible by the housing directly to the LEDs to attach desired light-directing devices directly to the LED. Since the housings are detachably fastened to the mounting rail, access to the LEDs is ensured for maintenance purposes.

According to a preferred embodiment, the attachment of the housing exerts a force on the housing in the direction of a contact surface of the support rail, in particular while the housing can cause a force on the associated LED in the direction of a contact surface of the support rail. Due to the force, the LED is pressed directly or indirectly onto the contact surface on the support rail, so that the thermal contact between the LED and the support rail is improved.

According to a preferred embodiment, the housing is fastened to the mounting rail by means of a spring clip. In particular, the spring clip may be engaged behind two opposite projections on the mounting rail. The spring clip can exert a force on the housing a direction of the contact surface of the support rail. By this embodiment, the above-mentioned force can be exerted on the LED in the direction of the abutment surface of the support rail to improve the thermal contact. In alternative embodiments, instead of the spring clip, screw connections can also be provided, which press the housing in the direction of the contact surface on the carrier rail.

To improve the thermal contact between the LED, possibly an intermediate element and the contact surface of the support rail, a thermally conductive intermediate material can be used. For example, a thermally conductive insulator such as TIM Sil pad can be used. The insulator may, for example, be in the form of a film and be arranged between the LEDs or the board occupied by LEDs and the contact surface of the mounting rail. As a result, the electrical contacts of the LEDs with respect to the support rail, which is in particular made of metal, insulated, wherein at the same time a thermal connection remains. Alternatively, a thermal compound may be provided at this point.

For the embodiment in which the LED housing is releasably secured to the support rail by means of a spring clip, the spring clip may in particular be designed so that it bears against the housing on two opposite sides transversely to the longitudinal extension of the support rail. As a result, the housing is pressed in the direction of the abutment surface of the mounting rail, so that the mechanical contact between the LED, possibly with an intermediate element and the mounting rail, is distributed uniformly over as large an area as possible. Thus, the thermal contact between the support rail and the LED is further improved, while the mechanical load indirectly exerted by the spring clip on the LED remains at a level that precludes damage to the LED.

According to a preferred embodiment, the spring clip comprises two free ends on one side and a closed end on the opposite side, wherein the two free ends behind a projection on the support rail on one side of the support rail and the closed end behind a projection of the support rail on the opposite Side can be hooked. The two free ends can be moved towards or away from each other, against the elastic force, so that the length of the spring clip decreases to release the spring clip from the protrusions on the mounting rail. This design of the spring clip is particularly simple and allows a tool-free release of the spring clip from the mounting rail.

According to a preferred embodiment, the support rail is made of a material with particularly good thermal conductivity, for. B. made of metal, especially aluminum. This ensures heat dissipation from the LEDs via the DIN rail. There may be heat sink either directly to the mounting rail or to another part of the lamp with which the support rail is in thermal contact, may be provided.

According to one embodiment of the invention, the one LED or a group of LEDs is mounted on a circuit board, wherein the board between the LEDs and the contact surface of the support rail is arranged. The board has the electrical connections to contact the LED (s). The board may be formed of a plastic material that withstands the thermal stress between the LED and the mounting rail which dissipates the heat generated by the LED during operation. In this way it is particularly easy to produce the electrical supply of the LEDs.

In the case of the last-mentioned embodiment, furthermore, the housings on the circuit board can be held by means of the LED assigned to the housing. When replacing an LED, the entire component is replaced by one or more LEDs, the associated housing and the board on which the LEDs are mounted. According to one embodiment, the printed circuit board can be firmly connected to the mounting rail or, according to another embodiment, can only be held indirectly via the housings assigned to the LEDs. A good thermal conductivity between the board and the mounting rail by a flat contact between them is preferred for both embodiments.

According to a preferred embodiment, a plurality of LEDs with their respective associated housings along a longitudinal extent of the support rail are freely positionable. For example, continuous projections may be provided in the form of rails on both sides of the support rail, at which at any point a spring clip of the type described above can be set. This embodiment is particularly advantageous for arranging LEDs along the support rail according to the desired light distribution to be achieved by the luminaire. In the case of mounting rails which have a curvature, it is often desired that the LEDs be arranged at a smaller distance in the outer area of the lamp or at the end of the mounting rail than in the central area. This can be done by the free positioning of the LEDs along the mounting rail readily even in the luminaire assembly on site. If several LEDs are arranged on a common board, the group of LEDs on the board can in each case be arranged variably along the mounting rail. If the LEDs are provided individually on boards, the distances between the LEDs along the mounting rail can be set completely freely.

According to one embodiment, a reflector is provided in the housing of the LED in order to focus or to expand the light of the LED. Additionally or alternatively, an optic may be provided in the housing, such as a lens or a diffuser in front of the LED. In addition, color filters can also be provided on the housing in order to change the color of white LEDs.

According to a preferred embodiment, the optics can be fastened in different orientations to the housing. This embodiment is preferred for optics having an asymmetric light distribution with respect to the optical axis of the Achieve LED. In particular, the optics can be oriented at angular intervals of 180 ° or 90 ° or at other small angular intervals or continuously about the optical axis. As a result, by arranging the same optics differently, the asymmetrical light output can be set in the desired direction. It can always be used the same optics, which is plugged in different orientations on the housing to produce the light deflection in the desired direction.

According to a preferred embodiment, the mounting rail is releasably attached to the lamp. To replace LEDs of a mounting rail, the mounting rail can be removed from the lamp, and then the individual LEDs or groups of LEDs can be replaced on a board with the associated housings on the mounting rail. In this embodiment, it is considered that the support rail relative to the lamp has a good thermal contact to dissipate heat of the LEDs on the mounting rail on the lamp housing and possibly arranged on the lamp housing cooling device.

According to one embodiment of the invention, the mounting rails have a curvature along their longitudinal direction. With a variety of such DIN rails can be a single or multiple curved surface of the lamp equipped with LEDs. The surface is provided in accordance with a desired light distribution of the lamp in different tangential directions and with different radii of curvature. In combination with the aforementioned flexible arrangement of the LEDs along the carrier rail, a large number of desired light distributions can be realized with such a luminaire.

Further features and advantages of the present invention will be explained on the basis of a preferred embodiment in conjunction with the following drawings, which show the following:

1 shows a perspective view of a luminaire of the present invention.

2 shows a plan view of a mounting rail with four LEDs.

three shows a section through the mounting rail of 2 along the line BB.

4 shows a view of the mounting rail 2 of the page.

5 shows a section through the DIN rail along the line AA 4 ,

6 shows a section through the mounting rail along the line DD of 2 ,

7 shows in two different views an LED housing with reflector.

8th shows in two different views of an LED housing, which is set up for the attachment of an optical system.

9 shows in perspective view a spring clip for attaching the LED housing to the mounting rail.

10 shows a perspective view of a lens, which is designed to be plugged onto an LED housing.

11 shows a perspective view of a mounting rail with two alternative embodiments of LED housings on a mounting rail.

An embodiment of the present invention relates to an outdoor light z. B. in the form of a street lamp 1 , in the 1 is shown in perspective view. This is intended for mounting on a lamp post and has to the bottom of a recording 2 for a round light pole. The mast intake 2 goes into a luminaire housing, which has on the side facing the road a double-curved surface within which a plurality of LEDs 4 are arranged. The area within which the LEDs 4 are arranged, is concave in one direction and convexly curved in the direction perpendicular thereto. This curvature allows the LEDs to be arranged in a desired spatial orientation.

The LEDs 4 are along several mounting rails 6 arranged, which extend approximately parallel along the convex curvature of the lamp.

The 2 shows in an enlarged view a plan view of one of the mounting rails 6 with four LEDs attached. three shows the mounting rail 6 and the LEDs 4 in cross-section along the line BB of 2 , and 4 shows the mounting rail 6 as a side supervision.

As in the views below three and 4 can be seen, the support rail has 6 a convex curvature corresponding to the luminaire shape. The radius of curvature of the rail is for the lamp shown 1 different for all mounting rails. Convex curvatures are particularly preferred in sectional planes of the luminaire, in which a relatively wide light distribution, as required for a street lamp, to be generated.

In the illustrated embodiment, a total of four LEDs 4 on a common board 8th arranged in a row. Inside the board 8th is the electrical wiring of the LEDs 4 provided (not shown). The board 8th is via a plug contact 10 electrically connected to the supply lines in the luminaire.

The board 8th has a curvature corresponding to the radius of curvature of the mounting rail 6 on, so that they flat on a Anligefläche 12 the mounting rail 6 rests. For this purpose, the board is formed of a flexible plastic material to the radius of curvature of the contact surface 12 to be able to adapt. In the board 8th are several holes 14 provided by the pins (not shown) can be inserted to the board 8th with corresponding holes 16 the mounting rail 6 to be able to connect. The connection will cause the board to move 8th in the longitudinal direction of the mounting rail 6 prevented. In particular, the pins can only serve as an assembly aid to the board 8th at the contact surface 12 align. After final assembly of the board 8th the pins can be removed again. This will cause mechanical stresses between the board 8th and the mounting rail 6 avoided during heating of the arrangement during operation.

In an alternative embodiment, the board may 8th also with the mounting rail 6 be firmly connected. For example, rivets can pass through the board 8th be provided in the holes 16 intervene to the board 8th on the mounting rail 6 to keep. According to another embodiment, the board 8th with the mounting rail 6 also be glued. In particular, adhesives are preferred which have good thermal conductivity between the board 8th and the mounting rail 6 guarantee.

Every LED 4 on the board 8th is a housing 18 assigned. The housing 18 has an opening in the middle, in which the LED 4 is recorded. At the top, the housing is open so that the light from the LED to the light exit side of the luminaire can escape from the housing. Different forms of housings 18 respectively. 18 ' are exemplary in the 7 and 8th shown as individual parts.

The following is the attachment of the housing 18 the LEDs 4 and the board 8th on the mounting rail 6 explained. Referring to the 5 is the cross section along the mounting rail 6 represented at a location where the housing 18 is cut laterally (along the line AA of 4 ). The mounting rail 6 has in the longitudinal direction on both sides in each case an approximately L-shaped projection 20 on, in the embodiment shown over the entire mounting rail 6 extends on both sides of this consistently. The L-shaped projection 20 defines an inwardly directed nose, with a spring clip on both sides 22 can be locked. The spring clip 22 is as a single element in 9 shown. The spring clip 22 defines on two opposite sides each about a semicircular shape, which depends on the shape of the housing 18 is tuned. Like in the 2 can be seen, lies the spring clip 22 from above on the two sides of the housing, which are transverse to the longitudinal extent of the mounting rail 6 extend to. A closed end 23 of the spring element 22 is under the lead 20 hooked on one longitudinal side of the mounting rail. On the opposite side of the mounting rail 6 are two free ends 24 the spring clip 22 under the mirror-symmetrical projection provided 20 hooked.

The spring clip 22 exercises after hooking under the protrusions 20 a force on the case 18 out, pointing towards the contact surface 12 the mounting rail 6 is directed. This will cause the LED 4 including the board 8th on the contact surface 12 pressed down the support rail. This force ensures a flat concern of the board 8th at the contact surface 12 and thus for a good thermal contact between the LED 4 and the mounting rail 6 , In this way, the in operation of the LED 4 generated heat via the mounting rail 6 , which is made of a thermally conductive material such as aluminum, to be dissipated to the luminaire.

To release the connection between the housing 18 and mounting rail 6 can the free ends 24 the spring clip 22 be slightly pushed apart by hand, so that the spring element of the projection 20 can be removed. After releasing all spring clips 22 from the housings 18 all LEDs 4 can the board 8th with the LEDs 4 and the housings 18 be removed. Alternatively, the board can also be fixed by means of an adhesive to the contact surface. Preferably, this connection is also after the spring clips 22 are removed, again detachable. It can be between the board 8th and the support rail also be provided a thermal grease, which not only improves the thermal connection between the elements, but also fixes the board to the support rail so that the connection can also be solved again.

The housing 18 are on the board 8th even through the mechanical connection of the LED 4 and the board 8th attached. For this purpose, the housing engages 18 positively on the LED 4 on and the LED 4 is with the board 8th firmly connected to form an electrical contact.

In the 7 and 8th are two different embodiments of the housing 18 respectively. 18 ' shown. In the case 18 is a continuous reflection surface 26 provided around the LED. The reflecting surface 26 can be designed to focus the light emitted by the LED light. In particular, rotationsparapoloide reflection surfaces 26 provided at the focal point or in the vicinity of the LED is arranged.

8th shows an alternative embodiment of the housing 18 ' , which is for the use of optics, such as a lens, a prism or a diffuser, is set up. The housing 18 ' has recesses in the area of the LED, in which corresponding optical devices can be engaged.

Furthermore, it can be attached to the housings 18 respectively. 18 ' another light-directing device, such as a diffuser 28 according to 10 , put on. The plug-in mechanism is designed so that the lens 28 in two different positions, ie with a rotation angle of 180 ° with respect to the optical axis of the LED on the housing 18 respectively. 18 ' can be plugged. This embodiment is preferred when the diffuser produces an asymmetric light distribution. As in the 2 and three on the outer left housing 18 ' can be seen, owns the lens 28 several in cross-section triangular elevations at which the light of the LED is broken in a preferred direction. Due to the different orientation of the lens 28 in relation to the housing, the light control can be adjusted in the desired direction. The attachment mechanism between the lens 28 and the housing 18 ' is in 6 shown in cross section. The diffuser has hook-shaped projections on the spring clip 22 or in an alternative embodiment on a projection of the housing 18 ' engage. In alternative embodiments, a lens may also be mounted in four different positions on a housing or on the spring clip or the lens is continuously rotatable.

A particular advantage of the invention is that different housings, optics and lenses for the LEDs 4 can be combined within a mounting rail 6 , It can thereby individually create a desired profile of a light distribution. Further, for varying the generated light distribution, the LEDs 4 also along the mounting rail 6 at different positions by means of the spring clips 22 be attached. In this way, when mounting the luminaire LEDs on each of a single board or groups of LEDs on a common board 8th at different distances along the mounting rail 6 to be ordered.

11 shows alternative embodiments with respect to the spring clips for securing the housing to the mounting rail 6 , According to the two LED housings 18 on the left side of the mounting rail are spring clips 22 ' provided, which under an outwardly directed nose of the projection 20 ' engage the mounting rail. In this embodiment, the projection 20 ' formed in cross-section approximately T-shaped. By elastic bending of the spring clip 22 ' the connection to the mounting rail can be released again. The advantage of this embodiment is that the spring element 22 ' easier to access.

An alternative to attachment by spring clips 22 respectively. 22 ' is for the two housings 18 on the right side of the 11 shown. The housing 18 is in this embodiment by an approximately circular mounting ring 30 held on two opposite sides in each case an elastically resilient hook approach 32 which is on the inside under the projection 20 or 20 ' the mounting rail 6 can engage. To release the connection, the mounting ring 30 opposite the mounting rail 6 something twisted so that the hook-shaped lugs 32 from the lead 20 or 20 ' move off the support rail.

The mounting rails 6 are at the light 1 releasably secured. For this purpose are in the mounting rail 6 several recesses 34 provided (cf. 2 ), where by means of screws the mounting rail 6 at the light 1 is attached. The connection between mounting rail 6 and light 1 is designed so that a sufficient contact surface between the mounting rail 6 and the rest of the luminaire housing, to dissipate the heat from the mounting rail 6 to allow the light. Preferably, at least one of the contact surfaces thermal paste or a thermally conductive foil is provided to improve the thermal contact. On the back of the lamp 1 cooling fins (not shown) may be provided to dissipate the heat to the ambient air. According to an alternative embodiment, cooling fins are also provided directly on the mounting rails, which extend in the direction of the back of the lamp.

Further modifications of the preferred embodiments described above are possible within the scope of the invention. In particular, alternative luminaire shapes and thus different forms of mounting rails are taken into account. For example, a lamp several straight or concave curved mounting rails 6 exhibit.

LIST OF REFERENCE NUMBERS

1

lamp

2

pole diameter

4

LED

6

rail

8th

circuit board

10

plug contact

12

contact surface

14

Hole in circuit board

16

Hole in mounting rail

18, 18 '

casing

20, 20 '

head Start

22, 22 '

spring clip

23

closed end of the spring clip

24

free end of the spring clip

26

reflecting surface

28

diffuser

30

fixing ring

32

hook-shaped elastic approach

34

Recess of the mounting rail

Claims (16)

Lamp ( 1 ) with one or more mounting rails ( 6 ) for holding at least one LED ( 4 ), wherein the one or more LEDs ( 4 ) each a housing ( 18 . 18 ' ) is associated with the LED ( 4 ), and the housing ( 18 . 18 ' ) on the mounting rail ( 6 ) is releasably attached, wherein: one of the LEDs ( 4 ) or a group of LEDs ( 4 ) on a board ( 8th ) is arranged, wherein the board ( 8th ) between the LED (s) ( 4 ) and a contact surface ( 12 ) of the mounting rail ( 6 ), wherein the housing ( 18 . 18 ' ) on the board ( 8th ) by means of the housing ( 18 . 18 ' ) associated LED ( 4 ), and / or the housing ( 18 ' ) comprises means for receiving an optic for the LED associated with the housing, wherein the optics in different orientations on the housing ( 18 ' ) is attachable. Lamp ( 1 ) according to claim 1, wherein the attachment of the housing ( 18 . 18 ' ) a force on the housing in the direction of a contact surface ( 12 ) of the mounting rail ( 6 ) exercises. Lamp ( 1 ) according to one of the preceding claims, wherein the housing by means of a spring clip ( 22 . 22 ' ) on the mounting rail ( 6 ) is attached. Lamp ( 1 ) according to claim 3, wherein the spring clip ( 22 . 22 ' ) behind one or two opposing protrusions ( 20 ) on the mounting rail ( 6 ) is engaged. Lamp ( 1 ) according to claim 3 or 4, wherein the spring clip ( 22 . 22 ' ) a force on the housing ( 18 . 18 ' ) in the direction of a contact surface ( 12 ) of the mounting rail ( 6 ) exercises. Lamp ( 1 ) according to claim 3, 4 or 5, wherein the spring clip ( 22 . 22 ' ) on the housing ( 18 . 18 ' ) on two opposite sides transversely to the longitudinal extent of the mounting rail ( 6 ) is present. Lamp ( 1 ) according to one of claims 3 to 6, wherein the spring clip ( 22 ) has two free ends for releasing the spring clip ( 22 ) from the mounting rail ( 6 ) can be deflected toward or away from each other against an elastic force. Lamp ( 1 ) according to one of the preceding claims, wherein the mounting rail ( 6 ) made of metal, in particular aluminum. Lamp ( 1 ) according to one of the preceding claims, wherein a plurality of LEDs ( 4 ) with their associated housings ( 18 . 18 ' ) along a longitudinal extent of the mounting rail ( 6 ) are freely positionable. Lamp ( 1 ) according to one of the preceding claims, wherein the housing ( 18 ) comprises a reflector. Lamp ( 1 ) according to claim 3 or any claim dependent thereon, wherein the optic means of the spring clip ( 22 . 22 ' ) on the housing ( 18 ' ) is attached. Lamp ( 1 ) according to one of the preceding claims, wherein the mounting rail ( 6 ) detachable on the lamp ( 1 ) is attached. Lamp ( 1 ) according to one of the preceding claims, wherein the support rail has cooling means. Lamp ( 1 ) according to one of the preceding claims, wherein the mounting rail ( 6 ) has a curvature along its longitudinal extent. Lamp ( 1 ) according to one of the preceding claims, wherein the mounting rail ( 6 ) in thermal contact with cooling devices on the luminaire ( 1 ) is arranged. Lamp ( 1 ) according to one of the preceding claims, wherein the optics on the housing ( 18 ' ) at angular intervals of 180 ° or 90 ° or continuously rotatable about an optical axis of the LED ( 4 ) is alignable.

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