EP3803195A1

EP3803195A1 - Illumination device for a motor vehicle headlight

Info

Publication number: EP3803195A1
Application number: EP19723421.4A
Authority: EP
Inventors: Lukas Taudt; Nina Brauner; Mathias SCHRAGL; Christoph Längauer; Johann Höfler
Original assignee: ZKW Group GmbH
Current assignee: ZKW Group GmbH
Priority date: 2018-06-04
Filing date: 2019-05-14
Publication date: 2021-04-14
Anticipated expiration: 2039-05-14
Also published as: JP2021525447A; KR20210006953A; WO2019233713A1; CN112166283B; EP3578874A1; US11415289B2; CN112166283A; KR102481253B1; JP7146956B2; US20210231283A1; EP3803195B1

Abstract

The invention relates to an illumination device for a motor vehicle headlight, said illumination device comprising the following: - multiple light sources (10) which are designed to emit light beams in a main emission direction, - a primary optical system (100) having multiple light-guiding elements (110), said light-guiding elements (110) being arranged in the main emission direction of the light sources (10) and each having a light entry face (120) into which the light beams of the light sources can be fed, and a light exit face (130), the light-guiding elements (110) opening into a common light exit face (130), and - a holder (200) which is designed to hold the light entry faces (120) of the light-guiding elements (110) in position in relation to the light sources (10), the holder (200) having at least one latching element (210) formed with a latching tab (220) to fasten the primary optical system (100), the latching tab (220) being designed to engage in an undercut (140) associated with the latching tab (220) and provided on the primary optical system (100).

Description

LIGHTING DEVICE FOR A MOTOR VEHICLE HEADLAMP

The invention relates to a lighting device for a motor vehicle headlight, the lighting device comprising:

- Several light sources, which are arranged, light rays in one

Emit main emission direction,

a primary optic with a plurality of optical waveguides, which optical waveguide in

Main emission of the light sources are arranged and one each

Light entrance surface, in which the light beams of the light sources can be fed, and a common light exit surface, wherein the light guide open into the common light exit surface, and

- A holder which is adapted to hold the light entry surfaces of the light guide with respect to the light sources in position.

The invention also relates to a light module having at least one lighting device according to the invention.

The invention further relates to a motor vehicle headlight with at least one illumination device according to the invention or with at least one light module having at least one illumination device according to the invention.

Usually, lighting devices mentioned above are used in conjunction with light modules or motor vehicle headlights to generate light distributions. For this purpose, primary glass optics are usually used, with which simple geometries for primary optics can be realized. If, on the other hand, more complex geometries are required for primary optics, the use of glass is often unsuitable for this purpose.

It has been found that instead of glass for the production of complex geometries as material transparent, in particular highly transparent, photoconductive and moldable plastics are well suited. Particularly suitable for the production of complex attachment optics Poly (organo) siloxanes, it is particularly advantageous if the primary optic is made of a silicone material.

A disadvantage of the use of such plastics, in particular of silicone for

However, production of primary optics is that such a primary optic does not have the strength like a vitreous body. From an optical point of view, however, it is advantageous or necessary that the primary optics in particular with regard to

Positioning their light entry surface or their light entry surfaces with respect to a light source or sources of light has a stable shape as possible. An offset of the light entry surfaces with respect to the light source or light sources, in particular when using light-emitting diodes as light sources, leads, for example, to undesired light losses.

In turn, an offset of the light exit surfaces of the attachment optics can lead to the fact that the imaged photograph does not meet the desired requirements.

It is an object of the invention to provide an improved lighting device.

This object is achieved in that the holder for fixing the primary optics has at least one latching element, wherein the latching element is arranged in a detent element associated, provided on the primary optics counter-latching element

intervene.

This ensures that for holding the primary optics on the holder no further, additional component is required, as is often used in the prior art.

Preferably, the lighting device is a "pixel light device", the light sources being arranged in rows and columns.

In such a "pixel light device", the light sources can be controlled independently of each other, whereby different light distributions can be generated, in particular an adaptive high beam light distribution.

It can be provided that the at least one latching element has a latching nose or is formed as an undercut. It can also be provided that the counter-latching element a locking lug or as

Undercut is formed.

In a practical embodiment, it can be provided that the at least one latching element has a latching nose and the counter-latching element is designed as an undercut.

Preferably, in a transversely to the main emission of the light sources, elongated primary optics, several undercuts along the longitudinal axis of the primary optics may be arranged. According to the number of undercuts, in this case locking elements are arranged on the holder.

Preferably, at least two locking elements may be provided, each with associated undercut.

In particular, undercuts or corresponding latching elements are arranged above or below the light exit surface or the light sources, wherein

"Above" / "below" on the already mentioned longitudinal axis of the primary optics transverse to the main emission of the light sources in the assembled state of

Refer to lighting device.

The term "main emission direction" is understood to mean the direction in which the light sources radiate the strongest or most of the light as a result of their directivity.

It can also be provided that the latching element is designed as an undercut and the counter-latching element has a latching lug.

Advantageously, it can be provided if the at least one latching element is produced in one piece with the holder.

It can be provided that the holder is made of a thermoplastic.

Thermoplastics are better or easier to form compared to thermosets. It is particularly advantageous if the holder is made of a scattered light shading material, ie an opaque material, for example made of black plastic, in particular - for example, black - thermoplastic, so that stray light is particularly sealed off from adjacent light sources.

A further, alternative or preferably additional measure for avoiding light losses into the position holder is that the position holder is designed such that the contact surface of a light guide body (or the light guide body) with the

Position holder is as low as possible.

The light guide contacted the position holder thus only in a narrow

Contact area, for example in a circulating around the respective light guide line.

Advantageously, the primary optics can be made in one piece from a transparent, photoconductive and moldable plastic.

By "one-piece" is meant a production of primary optics in one piece, preferably by means of an injection molding process.

It should be noted that the primary optics with all their "components", for example the light exit surface, the light guide body, the counter-latching elements and other "components" arranged on the primary optics, have been produced integrally or in one piece in one production process.

In an expedient embodiment, the primary optic may be made of a silicone material.

Because of the elastomeric properties of a silicone material, demolding is possible in the production of primary optics without an additional slider since the primary optic is preferably produced by means of an injection molding process.

It may also be advantageous if the primary optics is made of a poly (organo) siloxane. Advantageously, it can be provided that the holder has a receiving portion with at least one opening in which the light guide can be accommodated and positioned.

Particularly well, the individual light guide can be held in position with respect to the light sources, if the holder for each light guide has an opening in which the associated light guide is accurately recorded and positioned.

The openings are holes or receptacles in the holder, with a precisely adapted cross section for the respective light guide; these will be in the

associated openings inserted and held by the holder in the desired position.

It can be provided that the holder has openings corresponding to the number of light guide bodies, which are each associated with a light guide body.

It may be favorable if the holder receives the light guide body at its end regions facing the light entry surfaces.

The light guide can thereby protrude slightly backwards from the recording or flush with the holder.

It can also be provided that the holder has at least one projecting in the main emission positioning wall, which is adapted to engage in a recess provided on the primary optics.

By "wall" is meant basically not only a projection in a plane.This term may also mean an association of several, planar walls, which are arranged for example at right angles to each other and / or form a kind of open square, ie together a U Form form.

It can be provided that the positioning walls have the same or different heights, in particular, also gradual height differences are possible. The at least one positioning wall generally ensures further stability of the primary optics in the assembled state of the lighting device, so that oscillation transverse to the main emission direction of the light sources can be largely avoided.

It can be provided that at least one positioning wall is arranged in the main emission direction laterally of the receiving section of the holder.

It may be advantageous if at least one projection is arranged on the at least one positioning wall, which extends oblong in the direction of the main radiation and is adapted to engage positively in the primary optics associated with the at least one projection guide groove.

It has been found that the at least one projection causes additional stability in the attached state of the primary optics on the holder.

Furthermore, it can be provided that in each case a material is inserted in the openings between the holder and the light-guiding bodies, which material has a lower refractive index than the material of the light-guiding body.

In particular, it is advantageous if the material with a lower refractive index surrounds the light-conducting bodies in such a way that it does not touch the position holder.

As a result, the limit angle for total reflection is increased, so that no or only small amounts of light leak out of the light guide.

Preferably, the light guide can be formed elongated, with a greater extent in the main emission of the light rays as transverse to it.

It can be provided that the light guide bodies have a cross section that tapers towards their light entry surfaces.

By thus increasing in Hauptabstrahlrichtung cross sections of

Light guide, the holder can be pushed only up to a certain point on the light-conducting bodies. For example, it can be provided that the light guide bodies are frustoconical or trap-shaped.

In principle, all multi-sided truncated pyramids are suitable, e.g. Hexagonal, approximately in the form of wedge-shaped honeycombs. The base shape is closely related to the LED chip arrangements and the desired light entry and exit.

It may be favorable if the light sources each comprise one or more light-emitting diodes.

Preferably, it can be provided that each light source in each case one or more

Includes light-emitting diodes. Preferably, each light source can be controlled separately and switched on and off accordingly, preferably also dimmable. If a light source consists of a plurality of light-emitting diodes, it can also be advantageous if each of the light-emitting diodes can be activated separately.

Likewise, the object is achieved by a light module having at least one illumination device according to the invention.

Furthermore, the object is achieved with a motor vehicle headlight having at least one illumination device according to the invention or a light module having at least one illumination device according to the invention.

With a lighting device according to the invention, for example, a

Low beam and / or a high beam are generated, including, for example, the left

Headlamp and the right headlamp each one according to the invention

Lighting device comprises, with which each of the left and the right part of the light distribution are generated. In the light exit direction in front of the holder while still a secondary optics, usually a lens provided by means of which the respective light distribution can be generated.

The lighting device according to the invention can also be used for a reversing light. The invention will be explained in more detail with reference to exemplary drawings. This shows

1 shows an exemplary lighting device in an exploded view with a holder and a primary optics, wherein the holder has two locking elements for fixing the primary optics,

2 shows the lighting device of FIG. 1 in a rear view,

3 shows the exemplary lighting device from the previous figures in an assembled state,

Fig. 3a shows the illumination device of Fig. 3 through the section C-C, and

4 shows an exemplary spruce module with a lighting device in one

Exploded view.

FIG. 1 shows an exemplary lighting apparatus having a plurality of spruce sources 10 configured to emit spruce beams in a main radiation direction

Primary optics 100 with a plurality Fichtleitkörpern 110, which Fichtleitkörper 110 in

Main emission of the spruce sources 10 are arranged and one each

Fichteintrittsfläche 120 and a spruce exit surface 130, and a holder 200 includes, which holder 200 is arranged to hold the Fichteintrittsflächen 120 of the Fichtleitkörper 110 with respect to the Fichtquellen 10 in position. Furthermore, the result

Fichtleitkörper 110 in a common spruce exit surface 130th

The spruce sources 10 each comprise one or more wet diodes, wherein each spruce source preferably comprises one or more wet diodes each. Preferably, each spruce source is separately controllable and correspondingly switched on and off, preferably also dimmable. If a spruce source consists of several wet diodes, it can also be advantageous if each of the wet diodes can be activated separately.

The term "main radiation direction" is generally understood to mean the direction in which the spruce sources 10 emit most or most of the spruce as a result of their directivity. In the figures shown, the main emission direction corresponds to the x-direction of the coordinate system drawn in each case in the figures.

Furthermore, the holder 200 for attachment of the primary optics 100 has two locking elements 210 formed with a latching nose 220, wherein the latching lugs are arranged to engage the latching lugs in each case to an ordered undercut 140, which undercut 140 is arranged on the primary optics 100, however, in FIG 1 can not be seen because of the view.

However, it may also be possible that more than two latching elements 210 and the associated undercuts 140 are provided on the primary optics 100.

In the example of a lighting device shown in the figures, the

Locking elements 210 made in one piece with the holder 200.

The primary optic 100 is made of a transparent, photoconductive and moldable plastic, preferably of a silicone material or a poly (organo) siloxane.

2, it can be seen that the holder 200 has a receiving section 230 with openings 231 corresponding to the number of light guide bodies, which openings 231 are each associated with a light guide body 110 and in which the light guide bodies 110 the primary optics 100 can be received and positioned, wherein the holder 200 receives the light guide 110 at their the light inlet surfaces 120 facing end portion.

Furthermore, the holder 200 has two positioning walls 240 that protrude in the main emission direction or x-direction and that are set up to engage in a depression provided on the primary optics 100.

In principle, a "positioning wall" is to be understood as meaning not only a projection in a plane, but also an association of a plurality of planar walls which are connected to one another, preferably at their respective lateral end edges, as in the exemplary lighting device The individual walls are at right angles to each other and form one Type open cart or a U-shape, wherein the connecting edge areas can be rounded.

Furthermore, the individual walls of a positioning wall 240 do not have the same height, wherein gradual height differences or courses can be seen in FIG. 1.

The positioning walls 240 generally provide further stability of the primary optics 100 in the assembled state of the illumination device, such that swinging transversely to the main emission direction or oscillation in the y direction

can be largely avoided.

Furthermore, projections 241 may be arranged on the positioning walls 240, which projections 241 extend oblong in the direction of the main emission direction or x-direction and are adapted to engage in a form-locking manner in a guide groove in the primary optics 100 assigned to the projections 241 in each case. Such protrusions 241 provide additional stability in a fixed state of the primary optic 100 to the holder 200.

As shown in Fig. 1, the positioning walls 240 are each arranged laterally or along the y-axis of the receiving portion 230, wherein the open sides of the

Positioning walls 240 are aligned with each other and partially limit the receiving portion 230 or demarcate.

Fig. 2 shows a rear view of the lighting device of Fig. 1, wherein in Fig. 2 it can be seen that the light guide 110 are formed in the illustrated lighting device elongated, with a greater extent in the main emission of the

Light rays or the x-axis as transverse to it. In addition, the light guide bodies 110 have a cross section which tapers towards their light entry surfaces 120. By thus increasing in Hauptabstrahlrichtung or x-direction cross-sections of

Lichtleitkörper 110, the holder 200 only up to a certain point on the

Lichtleitkörpern 110 are pushed.

Fig. 3 shows the assembled state of the lighting device from the previous figures, wherein Fig. 3a is a cross-sectional view along the section CC represents. It can be seen here that the individual light guide bodies 110 are received and positioned accurately in the openings 231.

The openings 231 are holes or receptacles in the holder, with a precisely adapted cross section for the respective light guide body 110; these are inserted into the associated openings 231 and can protrude slightly backwards out of the openings 231, as can be seen in Fig. 3a, or flush with the holder 200 and with the openings 231 complete.

4 shows an exemplary light module with a lighting device from the previous figures, wherein the light module additionally has a printed circuit board 11 on which the light sources 10 are arranged, a heat sink 500 which is set up to dissipate the heat produced during operation of the light sources, a secondary optics 300 and a housing 400 which is provided for receiving the remaining components comprises, wherein the

Secondary optics is set up by the light exit surface 130 of the

Lighting device to form outgoing light rays to obtain a desired light distribution, such as a low beam and / or a

High beam distribution, whereby still other or further light distributions are possible.

In the assembled state of the light module, the printed circuit board 11 having light sources 10 is held between the heat sink 500 and the holder 200, wherein pins arranged on the heat sink pass through the printed circuit boards through openings provided for this purpose.

LIST OF REFERENCE NUMBERS

Light sources ... 10

PCB ... 11

Primary optics ... 100

Fiber optics ... 110

Light entrance surface ... 120

Light exit surface ... 130

Behind cut ... 140

Holder ... 200

Latching element ... 210

Latch ... 220

Receiving section ... 230

Opening ... 231

Positioning wall ... 240

Lead ... 241

Secondary optics ... 300

Housing ... 400

Heat sink ... 500

Claims

1. Lighting device for a motor vehicle headlight, which

Lighting device comprising:

- A plurality of light sources (10), which are arranged, light rays in one

Emit main emission direction,

- A primary optics (100) with a plurality of light guide bodies (110), which light guide body (110) in the main emission of the light sources (10) are arranged and one each

Light entrance surface (120), in which the light beams of the light sources can be fed, and a common light exit surface (130), wherein the light guide (110) open into the common light exit surface (130), and

a holder (200) arranged to hold the light entry surfaces (120) of the light guide bodies (110) in position relative to the light sources (10), characterized in that the holder (200) for fixing the primary optics (100) at least one latching element (210), wherein the latching element (210) is arranged to engage in a detent element (140) assigned to the latching element (210) and provided on the primary optics (100).

2. Lighting device according to claim 1, characterized in that the at least one latching element (210) has a latching nose (220) or is formed as an undercut.

3. Lighting device according to claim 1 or 2, characterized in that the counter-latching element (140) is formed a latching nose or as an undercut (140).

4. Lighting device according to one of claims 1 to 4, characterized in that the at least one latching element (210) is made in one piece with the holder (200).

5. Lighting device according to one of claims 1 to 4, characterized in that the primary optics (100) made of a transparent, photoconductive and moldable plastic is made in one piece.

6. Lighting device according to one of claims 1 to 5, characterized in that the primary optics (100) is made of a silicone material, preferably of a poly (organo) siloxane.

7. Lighting device according to one of claims 1 to 6, characterized in that the holder (200) has a receiving portion (230) with at least one opening (231), in which the light guide body (110) are receivable and positionable, wherein preferably the holder (200) corresponding to the number of light guide (110) has openings (231), each associated with a light guide (110).

8. Lighting device according to one of claims 1 to 7, characterized in that the holder (200) has at least one projecting in the main radiation positioning wall (240) which is adapted to engage in a provided on the primary optics (110) recess.

9. Lighting device according to claim 8, characterized in that in the main emission direction laterally of the receiving portion (230) of the holder (200) in each case at least one positioning wall (240) is arranged.

10. Lighting device according to claim 8 or 9, characterized in that on the at least one positioning wall (240) at least one projection (241) is arranged, which extends longitudinally in the direction of the main radiation and is arranged in a the at least one projection (241 ) associated guide groove in the primary optics (100) engage positively.

11. Lighting device according to one of claims 1 to 10, characterized in that the light guide body (110) are elongated, with a greater extent in the main emission of the light rays as transverse to it.

12. Lighting device according to one of claims 1 to 11, characterized in that the light guide (110) have a to their light entry surfaces (120) towards tapered cross-section.

13. Lighting device according to one of claims 1 to 12, characterized in that the light sources (10) each comprise one or more light-emitting diodes.

14. Light module with at least one lighting device according to one of claims 1 to 13.

15. Motor vehicle headlight with at least one lighting device according to one of claims 1 to 13 or at least one light module according to claim 14.