EP3426975A1

EP3426975A1 - Luminaire for uniform illumination

Info

Publication number: EP3426975A1
Application number: EP17705587.8A
Authority: EP
Inventors: Norbert Dicken; Marc ROSENBOOM; Tobias Pfaffenbauer
Original assignee: Osram GmbH
Current assignee: Osram GmbH
Priority date: 2016-03-09
Filing date: 2017-02-14
Publication date: 2019-01-16
Anticipated expiration: 2037-02-14
Also published as: WO2017153129A1; US20190093837A1; US10648630B2; DE102016203810A1; EP3426975B1

Abstract

The intention is to provide an LED luminaire having uniform illumination. What is proposed for this purpose is a luminaire having a luminaire rear wall (2) for mounting on a wall or ceiling, a printed circuit board (6), which is populated with a plurality of light-emitting diodes (13) and which has a connection cable (9), as illuminant, and a connecting terminal (10), which is connected to the connection cable (9) and onto which a supply cable (8) can be clamped. In addition, the luminaire has a spacer (11), which is fixedly mounted on the luminaire rear wall (2) and on which the printed circuit board (6) is releasably secured with the formation of a free space (7) between the printed circuit board (6) and the luminaire rear wall (2). The connection cable (9) is arranged entirely or for the most part alongside the connecting terminal (10) in the free space (7).

Description

description

LIGHTING FOR EVEN ILLUMINATION

The present invention relates to a luminaire having a luminaire rear wall for mounting on a wall or ceiling, a printed circuit board which is equipped with a plurality of light-emitting diodes and having a connection cable, as a lighting means, and a connection terminal, which is connected to the connection cable and to which a supply cable can be clamped.

Luminaires are expected to be uniform

Bring illumination. This is desirable not only for the illumination of the respective surfaces, but also desirable for the overall appearance of the luminaire.

This desire for uniform illumination also applies in particular to LED wall luminaires and LED ceiling luminaires. Problematic with regard to any

Shading is the connection wiring, which is often led via the LEDs in the light path. As a result, unwanted shadows and artifacts, for example, on the

Luminaire cover generated.

In typical LED luminaires, the connection cables that come out of the wall, as well as the cables that come from the light source, are placed next to the light source in order to produce as little shading as possible. However, this negatively affects the size of the lamps and the shape of the lamp. In addition, this can not be ruled out that the connecting lines on the

Illustrate luminaire covers. In practice, a solution is also widespread in which a separate ballast is placed between the wall connection cable and the illuminant. This ballast needs space and either leads to shading on the Luminaire cover or dark spots due to missing

Illumination, as the LEDs must be placed around the ballast. Consequently, a lower luminance then results in the area of the ballast, which manifests itself, for example, as a dark zone on the luminaire cover.

The object of the present invention is thus to provide a luminaire whose luminous means has a plurality of LEDs or light emitting diodes and whose illumination is as homogeneous as possible.

According to the invention this object is achieved by a lamp according to claim 1. Advantageous

Further developments of the invention will become apparent from the

Subclaims.

It is therefore provided a luminaire with a luminaire rear wall for mounting on a wall or ceiling. These

Luminaire rear wall is thus prepared for mechanical attachment to a wall, a ceiling or other carrier and has, for example, corresponding holes. In addition, the luminaire rear wall may have a recess, can be passed through the supply lines, for example, from a 230-V supply network. In addition, the luminaire has a printed circuit board with the

equipped with several LEDs and having a connection cable. Typically, the LEDs are evenly distributed on such a circuit board to a homogeneous

To achieve illumination. The power supply of this

Printed circuit board, which serves as a light source with their LEDs, via the connecting cable, which in the

Assembly is connected to the supply cable. Such a supply or connection cable is

typically two- or three-wire. For distribution reasons, several supply cables can be connected to the connection cable. The connection of the connection cable with the supply cable or supply cables is realized with a connection terminal of the lamp. As a connection terminal, for example, a terminal of the company WAGO can be used. In addition to these common components, the LED light is equipped with a spacer, which is attached to the

Lamp back firmly mounted and to which the circuit board is releasably secured to form a space between the circuit board and the lamp back wall. The printed circuit board is therefore not directly on the rear wall of the luminaire

attached, but one or more spacers ensure that a given distance between the

Printed circuit board and the luminaire rear wall is formed by which the said space is defined. If necessary, this free space can also bring about the advantage that air can circulate behind the printed circuit board and cool it accordingly. Advantageously, moreover, the connection cable is arranged wholly or largely and the connection terminal in the space. This means that the connection cable runs at most with its connection region or an insignificant part of its total length on that side of the circuit board on which the light-emitting diodes are arranged. Of the

Main part or the entire free part of the connection cable runs on the side facing away from the light emitting diodes back of the circuit board, ie in the space between the circuit board and

Lights back wall. As a result, the connecting cable as well as the connecting terminal can cause shadowing of the LEDs. Overall, therefore, results in a more homogeneous

Illumination of any provided

Luminaire cover or the illuminated area.

Preferably, a ballast is integrated in the circuit board. In this case, the ballast form a closed unit or it is individual components of the ballast distributed over the circuit board as well as the light-emitting diodes themselves. In the latter case, so

LEDs are placed between the components, so that the area of the ballast does not necessarily have to be dark.

Furthermore, it may be advantageous if in the free space between the circuit board and the lamp rear wall

Ballast of the bulb is arranged in a separate housing. In this embodiment, for example, standard ballasts can be used, whereby, for example, the manufacturing cost of the lamp can be reduced.

In this variant, in which the ballast is arranged in a separate housing between the printed circuit board and the lamp back or lamp back plate, the ballast itself or its housing may be formed as the spacer or the ballast together with the spacer define a distance between the circuit board and the lamp back.

Optionally, the ballast or the housing even single spacer between the lamp rear wall and

PCB. In this way, the ballast receives the additional functionality of the spacer, whereby the assembly cost can be further reduced. Furthermore, the spacer and the circuit board may be secured together by a releasable snap connection. This has the advantage that the printed circuit board only has to be pressed onto the spacer in order to fix it there by means of the snap connection. For disassembly, the snap connection can be released without tools or with tools.

In a special embodiment, the spacer may have a latching hook and the circuit board a recess

have, wherein the latching hook is releasably hooked in the recess. Of course, the arrangement of the

Connecting elements can also be provided in mirror image. In that case, the circuit board would be with a latching hook equipped and the spacer would have a corresponding recess. In these different ways, a snap connection can be realized relatively easier. In a concrete form of realization, the

Spacer on a cylindrical body, which is fixed to the first rear side with the lamp rear wall

connected is. For example, the basic body can be glued or screwed to the rear wall of the lamp. Furthermore, the cylindrical base body but only on the

Luminaire back wall to be infected and hold there by means of indissoluble snap connection. Under the cylindrical shape here is understood to mean any general cylinder and so next to the

Circular cylinder, for example, a prism or cuboid.

In a special embodiment, the latching hook on a pin-shaped first portion of the first end face opposite the second end face of

cylindrical base body projects vertically, and at the distal end of the first portion is a pin-shaped second portion at an acute angle to each other

formed. In addition, a third section is formed at an obtuse angle at the distal end of the second section. This special type of snap hook allows a pure

vertical assembly and disassembly of the PCB from the rear wall of the luminaire. This is particularly advantageous for mounting on walls and ceilings. This results in the

Snap connection in particular in that the first pin-shaped portion of the latching hook is resiliently connected to the second portion of the latching hook. A certain

Spring property may also lie in the connection between the second portion and the third portion of the latching hook. Such a latching hook can be produced for example as an injection molded part. It should be a suitable

Plastic used, which guarantees the spring properties. Optionally, the latching hook is formed integrally even with the main body of the spacer and in particular cast in one piece. According to an alternative embodiment, the

PCB attached to the spacer by a bayonet connector. A corresponding bayonet connection provides a reliable attachment that can be performed quickly and released just as quickly.

According to a further advantageous embodiment, the circuit board is fastened exclusively by the spacer or a plurality of such spacers on the lamp rear wall. This means that no further mounting elements than the spacers themselves or the connecting elements formed thereon are necessary to the

PCB to hold the luminaire rear wall. In particular, then the edge of the circuit board is not supported in some way, for example on the lamp back wall. This lack of further fasteners also results in a more cost effective production,

simplified assembly and improved air circulation between the circuit board and the luminaire rear wall.

The present invention will now be explained in more detail with reference to the accompanying drawings, in which:

1 shows a cross section through a lamp according to an embodiment of the present invention.

Fig. 2 is an exploded view of an inventive

Lamp ;

Fig. 3 is a front view of a circuit board for

a luminaire according to the invention

Light cover;

FIG. 4 is a rear view of the circuit board of FIG. 3; FIG.

and Fig. 5 shows a spacer for a lamp according to the invention. The embodiments described in more detail below represent preferred embodiments of the present invention

It should be noted that the individual features can be realized not only in the formed feature combinations, but also in isolation or in other technically meaningful combinations.

According to one embodiment, it can be ensured that the lighting means, here a printed circuit board with

Light-emitting diodes, adapted to the luminaire to produce a homogeneous, shadow-free illumination. In order to make this possible, wall-side and luminaire-side cables are deposited in such a way that neither shading nor dark zones are caused. In the example of Fig. 1, a lamp is mounted on a ceiling 1. However, such a lamp can also be mounted on a wall or other support. The lamp has a lamp back wall 2, with which it is attached to the ceiling 1 or the other carrier. This attachment can be done for example by means of screws and dowels. The lamp rear wall 2 may be designed plate-shaped, but also, for example, plate-shaped. In one embodiment, the lamp rear wall 2 is circular. But it can also be designed oval, square or in another form. In addition, the luminaire backplane 2 may comprise one or more retaining elements, e.g. Tabs 3, with which a lamp cover 4 can be attached to the lamp rear wall 2. Like the exploded view of FIG. 2

shows more clearly, the light cover 4, for example, have a transparent ring. Fig. 2 further shows that the lamp rear wall 2, for example, a plurality of holes 5, with which the ceiling mounting, wall mounting or the like can be done. The lamp has as a light source a printed circuit board 6 with LEDs (see FIG. 3). In the present

Example, this circuit board is designed around. But it can also have a different geometric shape.

In addition, the circuit board 6 is present

Example dish-shaped. This is only pure

to see as an example. The printed circuit board 6 may for example also be purely planar. Focusing on education

Light radiation, the printed circuit board 6 may optionally be designed as a mirror-like.

The light source, so the circuit board 6 with LEDs, is mounted at a distance from the lamp rear wall 2. This creates a free space 7 between the lamp rear wall 2 and the circuit board 6. In this space wall or ceiling side supply lines, which together form a supply cable 8, and

Lamp side connecting cables, which together form a connecting cable 9, and connector

or connecting terminals 10 deposited.

The number of connection terminals can be one, two, three or more. For example, a connection terminal of the company WAGO can be used. By this dumping of all or most of the connection cable 9 and the one or more connection terminals 10 in the free space 7 they are not in the light path of the LEDs of the circuit board 6. In the example of FIG. 1, the light path extends from the circuit board. 6 down, and the connection cable 9 and the connection terminal 10 are located substantially above the circuit board 6. Because these connection elements are no longer in the light path, they produce no shadowing on any

Luminaire cover or on the surfaces to be illuminated.

The light source or the printed circuit board 6 with the LEDs is so by means of spacers 11 in the lamp positioned that the necessary distance and thus the

Free space 7 is created. The distance should be at least 10 mm, so that one or more connection terminals 10 can be comfortably positioned in the space 7. In a concrete example, 12 mm spacing is maintained.

This is sufficient for a NYM-3xl, 5 mm wiring (supply cable 8), the illuminant connection cables (connection cable 9) as well as several connection terminals 10 (for example WAGO 224-101).

The spacer or spacers 11 are fastened to the side of the luminaire rear wall 2 facing the printed circuit board 6. This can be done for example by screws 12, as indicated in Fig. 2. Alternatively, the spacers 11 may also be glued to the luminaire rear wall or attached, for example, by a non-releasable snap connection.

Fig. 3 shows an embodiment of a luminaire according to the invention without luminaire rear wall in the front view, i. from the luminous side. The lamp has one here

transparent, cup-shaped light cover 4. Behind it, the circular designed circuit board 6 can be seen. On the circuit board 6 numerous LEDs 13 are arranged. As far as possible, the LEDs 13 are evenly distributed on the surface of the circuit board 6, so that a uniform luminance is achieved. in the

Center of the circuit board is the connection cable 9 with two lines to recognize. A strain relief 22 protects the solder joints of the connecting cable 9 from too high a train.

Fig. 4 shows the back of the circuit board 6 of FIG. 3 again. From the center, the connection cable 9 projects with its two lines (for example, for the conductors L and N of FIG

Wall wiring). At the end of the lines of the

Connecting cable 9 are isolated connector or connection terminals 10. The strain relief 22 on the implementation of the circuit board 6 for the connection cable 9 can also be seen from the rear side of the printed circuit board 6 in the present example.

The connection cable 9 is not limited to include exactly two lines. Rather, the connection cable 9 may also have one, three or more cables. It is essential, however, that the largest part of the connecting cable 9 is located on the back of the printed circuit board 6. Only one

insignificant part of the connecting cable 9 is located in the present example on the front, which Fig. 3 shows. The cable bushing of the printed circuit board 6 is thus located in the immediate vicinity of the connection points at which the connection cable 9 is clamped or soldered. The fact that the cable 9 is performed immediately after the connection points on the back of the circuit board 6, are in the present example more than 90 percent of the connecting cable 9 on the back. Preferably, the length of the connecting cable 9 or each

Connecting cable not larger than the average distance of the LEDs in the area of the connection points of the circuit board. 6

The LED lamp usually also has a

Ballast. This ballast is either integrated on the circuit board or accommodated and mounted in the free space 7 between the circuit board 6 and the lamp rear wall 2 in a separate housing. In the example of FIG. 3, the ballast is integrated on the printed circuit board 6. The printed circuit board 6 has corresponding components 14. These components 14 of the ballast are but in their

Dimension so small that they practically do not lead to shadowing. Likewise, they do not protrude via light emitting diodes 13 of the circuit board 6. In the event that a ballast is used with a separate housing, this housing can also as the

Spacer for the circuit board 6 with respect to the Lamp back 2 can be used. Optionally, additional spacers 11 are used.

In the example of Fig. 2, three spacers 11 are used. This is sufficient without overdetermination. The

However, the number of spacers 11 can also be less than or more than three. The spacers should be designed so that the light source, namely the circuit board 6, pulled out of the lamp before mounting and after installation of the lamp rear wall 2 and the connecting lines 9 can be plugged back onto the lamp back wall 2. The

Spacers should therefore provide the user with an easily detachable connection between the luminaire rear wall 2 and

Create circuit board 6. This can at the same time a

complete freedom of form of the bulb arise and optimal illumination can be ensured.

Another variant is that the circuit board 6 is held by a hinge on the lamp rear wall 2 and the circuit board 6 is locked, for example, to a spacer. Own the hinge (s)

preferably the same or a similar distance that cause the spacers between the circuit board and the lamp back wall.

Fig. 5 shows a concrete embodiment of a

Spacer 11. This spacer 11 has a cuboid or cylindrical base body 15. In the present example, it is a cuboid or a rectangular cylinder with rounded edges, a first end face 16 and a second, opposite

Front side 17. From the second end face 17 is a first pin-shaped portion 18 from. This may for example have a length in the order of magnitude of the base body 15. In the mounted state on the luminaire rear wall 2, this first section 18 is aligned perpendicular to the luminaire rear wall 2. At the distal end of the first section 18, a second section 19 is at this at an acute angle formed. Again, at the distal end of the second portion 19, which is also formed pin-shaped, a third portion 20 is formed at an obtuse angle. The three sections 18, 19 and 20 form a latching hook. The first portion 18 and the second portion 19 are elastically connected to each other so that the acute angle between them can be reduced by pressure on the second portion 19. As a result, a snap connection can be realized, for example, by pressing the latching hook into a recess 21 (cf. FIGS. 2 and 4). The third

Section 20 of the latching hook ensures that the

Snap connection is non-destructive solvable again.

The latching hook 11 can be cast, for example, from a plastic. It is particularly advantageous if it is cast in one piece. With regard to the choice of material is to pay attention to the flexibility between the first portion 18 and the second portion 19 of the latching hook. Advantageously, a spacer (spacer) is thus provided in the luminaire according to the invention, by means of which a cavity between the luminaire rear wall 2 and

Bulb or circuit board is created. As a result, the connecting cables can be laid so that no shadow on any luminaire cover is visible. In this case, a detachable connection between the supply cable 8 and connecting cable 9 should be given by one or more connection terminals. As a result, the lamp can be separated from the lamp rear wall 2 and thus the lamp rear wall 2 unhindered be screwed to the ceiling or other carrier. Afterwards both cable ends can be easily connected. In summary, there is the advantage that the light source from the ceiling-mounted lamp is easily removable without any restriction in the photograph. , ^

Reference sign list

1 blanket

2 luminaire rear wall

3 tab

4 light cover

5 hole

6 circuit board

7 free space

8 supply cables

9 connection cables

10 connection terminal

11 spacers

12 screw

13 LED

14 component

15 basic body

16 first end face

17 second end face

18 first section

19 second section

20 third section

21 recess

22 strain relief

Claims

claims

1. Light with

a luminaire rear wall (2) for mounting on a wall or ceiling (1),

- A printed circuit board (6) which is equipped with a plurality of light-emitting diodes (13) and having a connection cable (9), as a lighting means, and

- A connection terminal (10) which is connected to the connection cable (9) and to which a supply cable (8) can be clamped,

marked by

- A spacer (11) fixed to the lamp rear wall (2) and to which the printed circuit board (6) below

Forming a free space (7) between the circuit board (6) and the lamp rear wall (2) is releasably attached, wherein

- the connecting cable (9) completely or mostly and the

Connecting terminal (10) in the free space (7) are arranged.

2. Lamp according to claim 1, wherein in the circuit board (6), a ballast is integrated.

3. Lamp according to claim 1, wherein in the free space (7) between the circuit board (6) and the lamp rear wall (2), a ballast of the lamp is arranged in a separate housing.

4. Lamp according to claim 3, wherein the ballast, in particular its housing, as the spacer (11) is formed or the ballast together with the spacer (11) defining a distance between the circuit board (6) and the lamp rear wall (2).

5. Lamp according to one of the preceding claims, wherein the spacer (11) and the printed circuit board (6) are fastened together by a releasable snap connection.

6. Lamp according to claim 5, wherein the spacer (11) has a latching hook and the circuit board (6) has a recess (21), and the latching hook in the recess (21) is releasably hooked.

7. Lamp according to claim 6, wherein the spacer (11) has a cylindrical base body (15) which is connected to a first end face (16) fixed to the lamp rear wall (2).

8. Lamp according to claim 7, wherein the latch hook a

pin-shaped first portion (18) of the one of the first end face (16) opposite second

Front side (17) of the cylindrical base body (15) protrudes perpendicularly, at the distal end of the first portion (18), a pin-shaped second portion (19) is formed at an acute angle to each other, and at the distal end of the second (19) section, a third section (20) is formed at an obtuse angle.

9. Luminaire according to one of claims 1 to 4, wherein the

Printed circuit board (6) on the spacer (11) by a

Bayonet connector is attached.

10. Lamp according to one of the preceding claims, wherein the circuit board (6) exclusively by the spacer (11) or more such spacers (11) on the

Luminaire rear wall (2) is attached.