WO2013120964A1

WO2013120964A1 - Lighting device having a circuit board and a structural component

Info

Publication number: WO2013120964A1
Application number: PCT/EP2013/053011
Authority: WO
Inventors: Peter Sachsenweger; Guenter Hoetzl
Original assignee: Osram Gmbh
Priority date: 2012-02-16
Filing date: 2013-02-14
Publication date: 2013-08-22
Also published as: DE102012202342A1; DE102012202342B4

Abstract

The lighting device (14) has a circuit board (11) and at least one structural component (13) fastened to the circuit board (11), wherein at least one structural component (13) is fastened to the circuit board (11) in a form-closed manner or in a directly bonded manner.

Description

description

The invention relates to a lighting device, comprising a printed circuit board and at least one structural component attached to the printed circuit board. The lighting device is preferably a lighting module. There are LED modules are known in which a populated with light-emitting circuit board is covered by a housing. The housing is frictionally secured to the circuit board by an interference fit of pins of the housing in a correspondingly narrow bore of the circuit board. It is disadvantageous that the housing can solve at a typically not too high mechanical stress.

In particular, the housing can also be targeted unauthorized removed and replaced without this being practically recognizable.

It is the object of the present invention to overcome the disadvantages of the prior art at least partially and in particular an improved attachment of a

Structural component on a circuit board a

To provide lighting device.

This object is achieved according to the characteristics of the independent

Claims solved. Preferred embodiments are

in particular the dependent claims.

The object is achieved by a lighting device, comprising a printed circuit board and at least one of the

Printed circuit board attached structural component, wherein at least one structural component on the circuit board form-fitting or directly (ie in particular without using a

Adhesive) is firmly bonded. This results in the advantage that the at least one structural component is fastened particularly firmly to the printed circuit board. In addition, an unauthorized decrease of the at least one structural component from the printed circuit board can be more easily detected. An unintentional disconnection of the

Structural component of the circuit board can be avoided.

A structural component is understood in particular to mean a component whose function essentially results from its three-dimensional shape, e.g. in contrast to

electrical components such as resistors, capacitors or integrated circuits or light sources such as LEDs. The structural component can also be understood and referred to as an at least predominantly mechanical ^λ component.

It is an embodiment that the structural component a

Housing part is. This allows a particularly secure protection of covered by the housing part components. The housing part may for example be a complete housing or a circumferential housing wall. The circulating

Housing wall, for example, be a band-shaped circumferential housing wall and be set up, for example, for fastening a translucent cover.

Alternatively, the structural component may be e.g. be a reflector, in particular a shell reflector. In one more

Further development, the structural component may be a holder, e.g. for an appearance.

It is still an embodiment that at least one

Light source, in particular semiconductor source, and / or

at least one electrical component of one

Structural component is laterally surrounded. This allows circumferential protection of the light source and / or the electrical component as well as a wiring (eg of bonding wires). It is a further development that the at least one electrical component represents at least part of a driver for operating the at least one light source. The at least one electrical component may include at least one electronic component such as an integrated

Circuit, SMD resistors or capacitors include.

It is another embodiment that at least one

Structural component is secured to the circuit board by means of at least one rivet connection form fit. The

Rivet connection has the advantage that it is very strong and simple, in particular automated, can be produced. During production, no vibrations occur. In addition, a pressing force between the structural member and the printed circuit board can be adjusted with high accuracy. In addition, damage to the riveted connection is particularly easy to recognize and virtually impossible to hide without tools, so that an unauthorized separation of the structural component of the circuit board is easy to inspect.

An associated rivet is preferably a rivet, which saves weight and material costs and allows easy deformation. It is yet another embodiment that the at least one structural component is a basic body made of plastic

has, of which at least one metallic rivet is positively surrounded. This allows a combination of a lightweight and versatile moldable body with a particularly firmly connecting and simply plastically deformable rivet.

It is an alternative education that the

Structural component is a metallic structural component.

It is also an embodiment that the base body made of plastic is an injection-molded body and the at least one metallic rivet is molded around the base body in a form-fitting manner is. Thus, the body can be handled together with at least one rivet integrated therein, which facilitates assembly with the circuit board and logistics.

For example, the at least one rivet in a

Injection mold are introduced and the body are molded on it. A method for producing a lighting device, comprising a printed circuit board and at least one of the

Printed circuit board attached structural component made of plastic, of which at least one metallic rivet is positively surrounded, wherein at least one structural component on the circuit board positively or directly (ie in particular without the use of a bonding agent) cohesively

is attached, then comprises at least the steps, the structural component by means of an injection molding process

manufacture, wherein introduced into the injection mold, the at least one rivet and the base body is molded on it.

It is an alternative development to that of the

At least one rivet for assembling structural component and printed circuit board is used separately and deformed, so is present as an independent component. In particular, a simple riveted connection between a metallic structural component and the printed circuit board is made possible. A rivet may also be integrated into a metallic structural member, for example as a corresponding, e.g. underside protruding, component area.

It is an embodiment of this that a part of the rivet which is overmolded by the base body has at least one lateral, in particular circumferential, projection. This allows a positive integration of the rivet in the body and a high stability in the longitudinal direction of the rivet. It is also an embodiment that the at least one rivet is arranged in a respective reduction of the printed circuit board. This allows a support of the circuit board,

in particular if the countersink or the return on the side opposite to the structural component

PCB is located. In particular, the at least one structural component may be located on a front side of the printed circuit board

be attached and the at least one reduction on a back of the circuit board in the area are a passage for the rivet.

It is also an embodiment that at least one thermoplastic structural component is attached to a thermoplastic region of the circuit board by means of laser welding directly cohesively. This can be additional

Components are dispensed with. Laser welding is also automatable and there are no vibrations. Apart from the structural component and the printed circuit board, no additional components are required. The laser welding is also particularly inexpensive feasible.

It is an embodiment of that the thermoplastic structural component with at least one tab on the

thermoplastic area of the circuit board by means of

Laser welding is attached. The tab provides a sufficiently large and good for laser welding

accessible contact area ready.

It is an embodiment of the fact that the thermoplastic structural component revolves around at least one sector

is designed component and the at least one tab protrudes inward. As a result, the at least one tab can be covered by the structural component, resulting in a

improved design impression. For example, the at least one tab may protrude inwardly in a circumferentially closed, band-shaped housing part. It is also an embodiment that the lighting device is a lighting module.

The above-described characteristics, features and advantages of this invention as well as the manner in which they are achieved will become clearer and more clearly understood

In connection with the following schematic description of exemplary embodiments that are associated with the

Drawings are explained in more detail. It can to

Clarity identical or equivalent elements must be provided with the same reference numerals.

Fig.l shows a sectional view in an oblique view of a printed circuit board on a, to be fastened by means of a riveted joint structural component of a lighting device.

FIG. 2 shows a section from FIG. 1 in the region of a not yet deformed rivet; FIG.

FIG. 3 shows the detail from FIG. 1 in the region of FIG

deformed rivet;

4 shows a sectional view in an oblique view of an attached to a circuit board, to be fastened by means of a laser welding further

Structural component of a further lighting device; FIG. 5 shows a detail of FIG. 4 in the region of FIG

Laser welding connection.

Fig.l shows a sectional view in an oblique view attached to a circuit board 11, by means of a

Rivet 12 to be attached structural component in the form of a housing part 13 of a lighting device 14. Die

Lighting device 14 may be in particular a lighting module.

The housing part 13 has a base body 24 made of plastic with a circumferential band-shaped or hollow cylindrical

Basic form. The housing part 13 is seated with its lower edge 15 on the circuit board 11. In the region of its upper edge 16, the housing part 13 has on its inner wall 17 a circumferential annular groove 27 for use of a translucent cover (o.Fig.) On.

From the lower edge 15 go at three points, which are rotationally symmetrical about a longitudinal axis of the housing part 13, mounting tabs 18 perpendicular to the outside. In the

Fastening tabs 18 is in each case a vertically standing, downwardly projecting hollow rivet 19 of metal integrated. The hollow rivet 19 may, for example, have been injection-molded in sections from the housing part 13 designed as an injection-molded body.

The printed circuit board 11 has at its front side 20 in a central region a plurality of light sources in the form of

Light-emitting diodes 21 and optionally electrical components,

Contact surfaces, wiring, etc. (above). The

Housing part 13 is also arranged on the front side 20 and surrounds the light emitting diodes 21 laterally. The circuit board 11 has three to the hollow rivets 19 conformally arranged bushings 28, which pass on a rear side 22 of the circuit board 11 in a reduction 23 or return. To assemble the housing part 13 with the

Printed circuit board 11, the housing part 13 is placed vertically on the circuit board 11 that the hollow rivet 19 through the

Bushings 28 are performed and protrude downward, as shown in more detail in Figure 2.

The tubular rivet 19 has in its surrounded by the plastic base body 24 of the housing part 13 section an annular circumferential projection 25, through which the

Hollow rivet 19 is held positively in the base body 24 along its longitudinal extent. On the underside 22 of the printed circuit board 11 is a bonding agent in the form of a double-sided adhesive tape 26, e.g. for attachment to a heat sink (o.Fig.) The

Lighting device 14. As shown in Figure 3, for fixing the housing part 13 to the circuit board 11 of the rivet 19 at its located in the reduction section 23 laterally outwards

bent and thus holds the housing part 13 at the

Printed circuit board 11 positive fit. This is the

Housing part 13 is pressed against the circuit board 11. Due to the fact that the tubular rivet 19 also passes through the bushings 28 with little or no lateral play, the housing part 13 has a relation to the printed circuit board 11

defined, exactly adjustable position.

4 shows a sectional view in oblique view of an attached to a printed circuit board 31, by means of a

Laser welding to be fastened further structural component 32 of a further lighting device 33. Figure 5 shows a detail of Figure 4 in the range of a laser weld.

The lighting device 33 is constructed similarly to the lighting device 14. However, the structural member 32 now has no outwardly projecting fastening tabs with rivets, but two inwardly projecting mounting tabs 34, one of which is shown here. These fastening tabs 34 are advantageously barely visible from the outside.

The fastening tab 34 rests on a corresponding fastening region of the printed circuit board 31 and consists of a thermoplastically deformable plastic. By

Laser welding, the fastening tab 34 can be connected directly to the circuit board cohesively, in particular if the circuit board 31 has at least at its contact area also thermoplastically deformable plastic.

Although the invention is shown in detail by the

Embodiments have been further illustrated and described, the invention is not limited thereto and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention. Thus, the attachment tabs 18 may also be arranged on the inside of the structural component 13. The structural component may be made of metal, etc.

Reference sign list

11 circuit board

12 riveted connection

13 housing part

14 lighting device

15 lower edge

16 upper edge

17 inner wall

18 fixing lug

19 rivet

20 front side

21 LED

22 back side

23 reduction

24 basic body

25 annular projection

26 double-sided adhesive tape

27 ring groove

28 implementation

31 circuit board

32 Structural component

33 lighting device

34 fixing lug

Claims

A lighting device (14; 33), comprising a printed circuit board (11; 31) and at least one structural component (13; 32) attached to the printed circuit board (11; 31), at least one structural component (13; 32) being attached to the printed circuit board (11,31 ) is fixed positively or directly cohesively.

Lighting device (14) according to claim 1, wherein the

Structural component is a housing part (13).

Lighting device (14; 33) according to one of the preceding claims, wherein at least one light source (21) and / or at least one electrical component of a structural component (13; 32) is laterally surrounded.

Lighting device (14) according to one of the preceding claims, wherein at least one structural component (13) on the printed circuit board (11) by means of at least one

Rivet (12) is positively secured.

Lighting device (14) according to one of the preceding claims, wherein the at least one structural component (13) comprises a base body (24) made of plastic, of which at least one metallic rivet (19).

is surrounded positively.

Lighting device (14) according to claim 5, wherein the

Basic body (24) made of plastic is an injection-molded body and the at least one metallic rivet (19)

positively overmolded by the base body (24).

Lighting device (14) according to claim 6, wherein one of the base body (24) encapsulated part of the rivet (19) has at least one lateral, in particular circumferential, projection (25).

8. lighting device (14) according to any one of claims 5 to 7, wherein the at least one rivet (19) in a respective reduction (23) of the printed circuit board (11) is arranged.

9. lighting device (33) according to one of the preceding

Claims, wherein at least one thermoplastic

Structural component (32) is attached directly to a thermoplastic region of the printed circuit board (31) by means of laser welding materially.

10. Lighting device (33) according to claim 9, wherein the

thermoplastic structural member (32) having at least one tab (34) is attached to the thermoplastic region of the printed circuit board (31) by means of laser welding.

11. Lighting device (33) according to claim 10, wherein the

thermoplastic structural component (32) is an at least sectorally circumferentially configured component and the at least one tab (34) projects inwardly.

12. Lighting device (14; 33) according to one of the preceding claims, wherein the lighting device (14; 33) a

Light module is.