EP3578874A1 - Lighting device for a motor vehicle headlamp - Google Patents

Abstract

Lighting device for a motor vehicle headlamp, which lighting device comprises: - several light sources (10) which are set up to emit light beams in a main emission direction, - primary optics (100) with several light guide bodies (110) which light guide bodies (110) in the main emission direction of the light sources (10) are arranged and each have a light entry surface (120) into which the light rays from the light sources can be fed, and a light exit surface (130), the light guide bodies (110) opening into a common light exit surface (130), and a holder ( 200), which is set up to hold the light entry surfaces (120) of the light guide bodies (110) in position with respect to the light sources (10), the holder (200) for fastening the primary optics (100) at least one with a latching lug (220 ) has formed latching element (210), wherein the latching lug (220) is arranged to be assigned in one of the latching lug (220) eten to engage the undercut (140) provided on the primary optics (100).

Description

• mehrere Lichtquellen, welche eingerichtet sind, Lichtstrahlen in eine Hauptabstrahlrichtung zu emittieren,
• eine Primäroptik mit mehreren Lichtleitkörpern, welche Lichtleitkörper in Hauptabstrahlrichtung der Lichtquellen angeordnet sind und jeweils eine Lichteintrittsfläche, in welche die Lichtstrahlen der Lichtquellen einspeisbar ist, sowie eine gemeinsame Lichtaustrittsfläche aufweisen, wobei die Lichtleitkörper in die gemeinsame Lichtaustrittsfläche münden, und
• einen Halter, der eingerichtet ist, die Lichteintrittsflächen der Lichtleitkörper in Bezug auf die Lichtquellen in Position zu halten.

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

• a plurality of light sources configured to emit light beams in a main radiation direction,
• a primary optics with a plurality of light-conducting bodies, which light guide bodies are arranged in the main emission direction of the light sources and each have a light entry surface, into which the light rays of the light sources can be fed, and a common light exit surface, wherein the light guide bodies open into the common light exit surface, and
• a holder adapted to hold the light entry surfaces of the light guide bodies in position with respect to the light sources.

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 the production of primary optics, however, is that such a primary optic does not have the strength like a glass body. From an optical point of view, however, it is advantageous or necessary for the primary optics to have the most stable shape possible with regard to the positioning of its light entry surface or its light entry surfaces with respect to a light source or sources. 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.

CLAIM 1

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

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-locking element is a detent or formed as an undercut.

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" relate to the already mentioned longitudinal axis of the primary optics transversely to the main emission direction of the light sources in the assembled state of the illumination 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.

CLAIM 2

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

CLAIM 3

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

Thermoplastics are better or easier to form compared to thermosets.

CLAIM 4

It is particularly advantageous if the holder of a stray light shading material, ie an opaque material, e.g. is made of black plastic, in particular - for example, black - thermoplastic, so that scattered light is shielded in particular 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 body thus contacts the position holder only in a narrow contact area, for example in a line running around the respective light guide.

CLAIM 5

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.

CLAIM 6

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.

CLAIM 7

It may also be advantageous if the primary optics is made of a poly (organo) siloxane.

CLAIM 8

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

CLAIM 9

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.

CLAIM 10

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.

CLAIM 11

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.

Under "wall" is basically not just a projection in a plane to understand. This term may also mean an association of a plurality of planar walls, which are arranged, for example, at right angles to one another and / or form a kind of open square, ie together form a U-shape.

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.

CLAIM 12

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.

CLAIM 13

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

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

CLAIM 14

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.

CLAIM 15

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

CLAIM 16

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 the light guide, the holder can be pushed only up to a certain point on the light-guiding 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.

CLAIM 17

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 comprises one or more 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 dipped beam and / or a high beam can be generated, for example, the left headlight and the right headlight each comprising a lighting device according to the invention, with 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.

• Fig. 1 zeigt eine beispielhafte Beleuchtungsvorrichtung in einer Explosionsdarstellung mit einem Halter und einer Primäroptik, wobei der Halter zwei Rastelemente zur Fixierung der Primäroptik aufweist,
• Fig. 2 zeigt die Beleuchtungsvorrichtung aus Fig. 1 in einer rückwärtigen Ansicht,
• Fig. 3 zeigt die beispielhafte Beleuchtungsvorrichtung aus den vorherigen Figuren in einem zusammengebauten Zustand,
• Fig. 3a zeigt die Beleuchtungsvorrichtung aus Fig. 3 durch den Schnitt C-C, und
• Fig. 4 ein beispielhaftes Lichtmodul mit einer Beleuchtungsvorrichtung in einer Explosionsdarstellung.

The invention will be explained in more detail with reference to exemplary drawings. This shows

• Fig. 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,
• Fig. 2 shows the lighting device Fig. 1 in a rear view,
• Fig. 3 shows the exemplary lighting device from the previous figures in an assembled state,
• Fig. 3a shows the lighting device Fig. 3 through the cut CC, and
• Fig. 4 an exemplary light module with a lighting device in an exploded view.

Fig. 1 illustrates an exemplary lighting apparatus, which plurality of light sources 10 which are arranged to emit light beams in a main radiation direction, a primary optics 100 are arranged with a plurality of light guide bodies 110 which light guide body 110 in the main emission direction of the light sources 10 and each having a light entry surface 120 as well as a light exit surface 130, and a holder 200 , which holder 200 is set up to hold the light entry surfaces 120 of the light guide bodies 110 in relation to the light sources 10 in position. Furthermore, the light guide bodies 110 open into a common light exit surface 130.

The light sources 10 each comprise one or more light emitting diodes, wherein each light source preferably comprises one or more 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.

The term "main emission direction" is generally understood to mean the direction in which light sources 10 emit most or most of the light 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.

Further, 200, the mount for the primary optics 100, two with a detent 220 formed latching elements 210, wherein the detents are adapted to engage one of the locking lugs respectively associated undercut 140 which undercut is disposed at the primary optics 100 140, but in Fig. 1 due to the view is not visible.

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 are 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.

Furthermore is in Fig. 1 - but improves in Fig. 2 - to see that the holder 200 includes a receiving portion 230 corresponding to the number of the light-conducting body provided openings 231 which which openings 231 are associated with one light guide body 110 and in which the light guide body 110 of the primary optical system 100 can be received and positioned, the holder 200, the Optical fiber 110 receives at its 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 .

Under a "positioning wall" is basically not just a projection in a plane to understand. By this term may also be meant an association of a plurality of planar walls joined together, preferably at their respective lateral end edges, as shown in the example lighting device in the figures. The individual walls are perpendicular to each other and form a kind of open cart or a U-shape, wherein the connecting edge regions can be rounded.

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

The positioning walls 240 generally provide further stability of the primary optics 100 in the assembled state of the illumination device, so 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 arranged 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 in Fig. 1 is shown, 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 delimit the receiving portion 230 .

Fig. 2 shows a rear view of the lighting device Fig. 1 , where in Fig. 2 It can be seen that the light guide bodies 110 are elongated in the illumination device shown, with a greater extent in the main emission direction of the light beams or the x-axis than transversely thereto. In addition, the light guide bodies 110 have a cross section which tapers towards their light entry surfaces 120 . As a result of the cross-sections of the light-conducting bodies 110 which thus increase in the main emission direction or x-direction, the holder 200 can only be pushed onto the light-conducting bodies 110 up to a certain point.

Fig. 3 shows the assembled state of the lighting device from the previous figures, wherein Fig. 3a 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 in Fig. 3a can be seen, or flush with the holder 200 or with the openings 231 complete.

Fig. 4 shows an exemplary light module with a lighting device from the previous figures, wherein the light module additionally a circuit board 11, on which the light sources 10 are arranged, a heat sink 500, which is adapted to dissipate the heat generated during operation of the light sources, a secondary optics 300 and Housing 400, which is intended to receive the remaining components, comprises, wherein the secondary optics is adapted to form the emanating from the light exit surface 130 of the lighting device light beams to obtain a desired light distribution, such as a low beam and / or a high beam distribution, 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. <B> LIST OF REFERENCES </ b> Light sources ... 10 PCB ... 11 Primary optics ... 100 Light guide body ... 110 Light entry surface ... 120 Light-emitting surface ... 130 Undercut ... 140 Holder... 200 Locking element ... 210 Locking lug ... 220 Receiving portion ... 230 Opening... 231 Positioning wall ... 240 Head Start... 241 Secondary optics ... 300 Casing... 400 Heatsink ... 500

Claims (15)

Lighting device for a motor vehicle headlight, the lighting device comprising: a plurality of light sources (10) arranged to emit light beams in a main emission direction, - A primary optics (100) having a plurality of Lichtleitkörpern (110), which Lichtleitkörper (110) in Hauptabstrahlrichtung the light sources (10) are arranged and each have a light entrance surface (120) into which the light rays 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 with respect to the light sources (10); characterized in that
the holder (200) for fastening the primary optics (100) has at least one latching element (210), wherein the latching element (210) is arranged to engage in a latching element (140) assigned to the latching element (210) and provided on the primary optics (100) , 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. Lighting device according to claim 1 or 2, characterized in that the counter-latching element (140) is designed as a latching nose or as an undercut (140). 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). 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. 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. 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). 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 direction positioning wall (240) which is adapted to engage in a provided on the primary optics (110) recess. 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. 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 the at least one projection (241) associated Guide groove in the primary optics (100) engage positively. 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. Lighting device according to one of claims 1 to 11, characterized in that the light guide bodies (110) have a tapered to their light entry surfaces (120) cross-section. 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. Light module with at least one lighting device according to one of claims 1 to 13. Motor vehicle headlight with at least one illumination device according to one of claims 1 to 13 or at least one light module according to claim 14.

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