EP3830472A1

EP3830472A1 - Optical device for a motor vehicle headlight comprising optical waveguides

Info

Publication number: EP3830472A1
Application number: EP19742151.4A
Authority: EP
Inventors: Lukas Taudt; Rene Kamleithner; Dominik Wanitschek
Original assignee: ZKW Group GmbH
Current assignee: ZKW Group GmbH
Priority date: 2018-08-03
Filing date: 2019-07-12
Publication date: 2021-06-09
Anticipated expiration: 2039-07-12
Also published as: WO2020025291A1; JP6999065B2; JP2021532560A; US20210310627A1; CN112469940A; EP3830472B1; EP3604902A1; KR102506798B1; US11248765B2; KR20210035260A

Abstract

The invention relates to an optical device (1) for a motor vehicle headlight, said device comprising the following: a primary optical element (100) having a main body (101) and a plurality of optical waveguide bodies (110) having a light-receiving surface (120) and a light-emitting surface (130); a holder (200) on which the primary optical element (100) is arranged, wherein the optical waveguide bodies (110) penetrate the holder (200) via an opening region (201) of the holder; and a covering element (300) which is arranged on the holder (200) and comprises openings (310) which receive the optical waveguide bodies (110), wherein the covering element (300) can be connected to the holder by means of a projection (420) comprising an engaging section (421) and an end section (422) and a guide recess (410) having a first region (411) and a second region (412), said second region extending in a slip-on direction (X), wherein the projection (420) can be inserted in the first region (411) such that the second region (412) can be slipped onto the engaging section (421) by means of the movement of the covering element (300) in the slip-on direction (X).

Description

OPTICAL DEVICE FOR A MOTOR VEHICLE HEADLIGHT WITH

LIGHT LADDERS

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

primary optics with a base body and with a plurality of light guide bodies projecting from the base body for forming a desired light distribution from the light from light sources, which light guide bodies each have a light entry surface into which light from light sources can be fed, and a light exit surface,

a holder on which the base body of the primary optics is arranged on a front side of the holder, the light-guiding bodies of the primary optics passing through the holder through an opening area of the holder, and

- A cover element which is arranged on a rear side of the holder facing away from the base body of the primary optics, the cover element having a number corresponding to the number of light guide bodies and openings corresponding to the light guide bodies, which openings are arranged, the light guide bodies

To take up primary optics and to hold them in position, the cover element being connectable to the holder by means of at least one first engagement element arranged on the cover element, which first engagement element engages on at least one second engagement element arranged on the holder.

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

The above-mentioned lighting devices are usually used in connection with light modules or motor vehicle headlights to generate light distributions, preferably a low beam and / or high beam distribution. For this purpose, light from light sources is fed into the respective light entry surfaces of the light-guiding bodies, which light accumulates in the light-guiding bodies by means of reflection and / or total reflection Propagates side walls of the light guide body, the light emerging again via the light exit surfaces of the respective light guide.

For this it is necessary that the primary optics or the light guide bodies of the primary optics are positioned precisely in relation to the corresponding light sources.

For this purpose, for example, a holder can be provided which holds the light guide bodies in position with respect to the light sources, such a holder being able to be made from a plastic. During operation of the lighting device or the light sources, high temperatures can occur due to the heat radiation from the light sources. Since the light guide bodies and therefore also the holder are positioned relatively close and at a short distance from the light sources, undesirable thermal damage or deformation of the holder and thus also a change in the position of the light guide bodies or due to heat conduction can also result in thermal damage due to the heat effect of the Operating light sources occur.

Damage or misalignment of the light guide body, in turn, can result in the light image depicted not meeting the desired requirements.

For this reason, a cover element is arranged between the holder and the light sources, which serves as a kind of heat shield. It should be noted, however, that the distance between the light-guiding bodies and the light sources is not changed and a suitable installation for fixing them to the holder is found, since there is little installation space between the holder and the light sources.

It is an object of the invention to provide an improved optical device for a

To provide motor vehicle headlights.

This object is achieved in that the at least one second engagement element is designed as a projection projecting from the holder with an engagement section which has a height and a width extending from the holder and an end section which has a height and a width, and wherein the at least one first engagement element is designed as a guide recess in the cover element, the guide recess having a first region and a second region which is tapered in comparison to the first region, the second region extending along a sliding direction and one transverse to the

Has width running in the sliding direction, the projection being insertable into the first region of the guide recess and being displaceable within the guide recess in such a way that the second region of the guide recess is by means of a

Movement of the cover element in the slide-on direction can be pushed onto the engagement section of the projection.

The primary optics can advantageously be manufactured in one piece from a transparent, light-conducting and moldable plastic.

“One-piece” is to be understood as meaning that the primary optics are manufactured from one piece, preferably by means of an injection molding process.

In an expedient embodiment, the primary optics can be made from a silicone material.

Due to the elastomeric properties of a silicone material, demolding is possible in the production of the primary optics without an additional slide, since the primary optics are preferably produced by means of an injection molding process.

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

It can advantageously be provided that the holder has an opening area with at least one opening, in which the Fichtleitkörper can be received and positioned.

The individual Fichtleitkörper can be held in their position with respect to the Ficht sources particularly well if the holder and / or the cover element for each Fichtleitkörper has an opening in which the associated Fichtleitkörper is accommodated and positioned accurately. The openings are holes or receptacles in the holder or the cover element, with a precisely adapted cross section for the respective light guide body; these are inserted into the assigned openings and held in the desired position by the holder.

It can be provided that the holder and / or the cover element have openings corresponding to the number of light guide bodies, each of which is assigned to a light guide body.

It can be advantageous if the holder and / or the cover element receive the light guide bodies at their end regions facing the light entry surfaces.

The light guide bodies can protrude slightly to the rear from the receptacle or the openings of the cover element or can be flush.

For example, it can be provided that the light guide bodies are frustoconical or trapezoidal.

In principle, all multi-sided truncated pyramids come into question, e.g. hexagonal, approximately in the form of wedge-shaped honeycombs. The shape of the base area is closely related to the LED chip arrangements and the desired light shaping, whereby the light entry and exit can be essential.

Furthermore, it can be provided if the cover element is designed as a plate or as a sheet, which plate rests on the holder in a pushed-on state. It can be provided that the plate or sheet according to the shape of the holder

Has deformations.

The width of the engagement section can advantageously be smaller than the width of the

End section.

This ensures that the cover element is held positively on the holder in a pushed-on state. It can further be provided that the width of the second region of the

Guide recess corresponds at least to the width of the engagement portion of the projection.

The width of the engagement section should preferably be only slightly smaller than the width of the second region of the guide recess in order to shift the

To prevent cover element transverse to the slide-open direction.

It can also be favorable if the end section of the projection has a taper in the opposite direction to the push-on direction.

This makes it easier to put on and then slide on the cover element or the individual engagement sections of the projections.

It can advantageously be provided that the cover element has a thickness, the height of the engagement section of the projection corresponding at least to the thickness of the cover element, preferably the thickness in the region of the guide recess

Cover element.

The cover element can advantageously have a constant thickness.

In an expedient embodiment, the holder can have at least one stop element, which stop element is set up to limit the displacement of the cover element in the direction of the push-on direction, preferably at least two stop elements being provided.

It can further be provided that at least two first engaging elements and at least two second engaging elements corresponding to the first engaging elements are provided.

At least one first engagement element and a corresponding second engagement element are preferably arranged above and below the openings of the cover element or above and below the opening area of the holder. The terms “above” / “below” refer to the longitudinal axis of the primary optics or of the main body of the primary optics, preferably transverse to the main emission direction of the light sources, in the assembled state of the optical device.

The “main emission direction” is to be understood as the direction in which the light sources emit the most or most of the light due to their directivity.

It can be advantageous if at least one thickening element is on a side of the cover element opposite the cover element when the cover element is pushed open

End portion of the projection or on a side facing the holder

End portion of the projection is arranged, wherein the distance between the holder and the at least one thickening element is less than the height of the engagement portion of the projection, preferably at least two thickening elements on the

End section are arranged.

As a result, the cover element is additionally pressed onto the holder when it is pushed onto the holder, so that the cover element is fixed as firmly as possible on the holder.

It can preferably be provided that the thickening elements are rounded or represent part of a spherical body. This will push on

Cover element relieved again.

It can be provided that at least one latching lug is arranged on the holder, which is set up to snap into a fixing recess corresponding to the latching lug and which is provided on the cover element.

The locking lug and the fixing recess are preferably arranged such that the locking lug only fully engages in the fixing recess when that

Cover element abuts or strikes the stop elements.

This ensures that the cover element against the

Is fixed at _S chieberichtung.

The object is also achieved with an illumination device with at least one optical device and a number of light corresponding to the number of light guide bodies emitting light sources, which light is provided for feeding into the at least one optical device.

The lighting device is preferably 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 one another, as a result of which different light distributions can be generated, in particular an adaptive high beam light distribution.

It can be advantageous if the light sources each comprise one or more light-emitting diodes.

It can preferably be provided that each light source has one or more

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

It can be provided that exactly one or at least one light source is assigned to each light guide body.

The object is also achieved by a light module with at least one lighting device according to the invention.

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

With a lighting device and / or light module according to the invention, for example, a low beam and / or a high beam can be generated, for which purpose

for example the left headlight and the right headlight each one

comprises lighting device according to the invention and / or light module, with each of which the left and the right part of the light distribution are generated. In The light exit direction in front of the holder is a secondary lens, usually a lens, by means of which the respective light distribution can be generated.

The lighting device and / or light module according to the invention can also be used for a reversing light.

The invention is explained in more detail below on the basis of exemplary drawings. Here shows

1 is an exploded view of an exemplary optical device with a holder and a cover element, wherein a projection protruding from the holder is arranged to engage in a guide receptacle of the cover element in order to connect the holder to the cover element,

2A is a schematic detailed view of the guide receptacle and the projection in a plan view,

2B is a cross section of the illustration of FIG. 5A along the section A-A,

2C shows a cross section of the representation from FIG. 5B along the section B-B,

FIG. 3 shows a perspective view of the optical device from FIG. 1 in one

assembled condition,

Fig. 4 is a rear view of the optical device of Fig. 3, and

FIG. 5 shows a side view of the optical device from FIG. 4 with light sources arranged.

1 shows an exemplary optical device 1 in an exploded view, a plurality of light sources 10 being arranged on a rear side of the device 1 and being configured to emit light beams in a main emission direction.

The optical device 1 comprises a primary optic 100 with a base body 101 and with a plurality of light guide bodies 110 projecting from the base body 101, which

1 are arranged in the main emission direction of the light sources and each have a light entry surface 120, into which the light beams of the light sources can be fed, and a light exit surface 130.

Furthermore, the device 1 comprises a holder 200, on which the base body 101 of the primary optics 100 can be arranged or fastened on a front side of the holder 200, the light guide bodies 110 of the primary optics passing through the holder 200 through an opening area 210 of the holder 200.

Furthermore, the device 1 comprises a cover element 300, which on a

Base 101 of the primary optics 100 facing away from the back of the holder 200 is arranged and has a thickness dl, preferably a constant thickness, wherein the

Covering element 300 has a number corresponding to the number of light-guiding bodies 110 and has openings 310 corresponding to the light-guiding bodies 110, which openings 310 are designed to receive and hold the light-guiding bodies 110 of the primary optics 100 in position.

In the example shown, the cover element 300 can be connected to the holder 200 by means of five first engagement elements 410 arranged on the cover element 300, which are each intended to engage on second engagement elements 420 arranged on the holder 200.

In the exemplary embodiment shown in the figures, the second engagement elements 420 are each a projection 420 protruding from the holder 200 and the first

Engagement elements 410 formed as a guide recess 410 in the cover element 300. 2A, 2B and 2C each show detailed views of the connectable engagement elements.

The projections 420 also have, as can be seen more clearly in FIG. 2A, for example, an engagement section 421, which has a height h1 extending from the holder 200 and a width bl, and an end section 422, which has a height h2 and a width b2 and has a length of 12. In the exemplary embodiment shown, the width bl of the engagement section 421 is smaller than the width b2 of the end section 422.

Each guide recess 410 has a first region 411 with a width b4 and a length 14 and a second region 412 which is tapered in comparison to the first region 411, which second region 412 extends along a slide-on direction X and has a width b3 running transversely to the slide-on direction X, as can be seen in FIG. 2A.

A projection 420 or its end section 422 can in each case be passed through the first area 411 of a guide recess 410, so that the second area 412 of the

Guide recess 410 can be pushed onto the engagement section 421 of the projection 420 by means of a displacement of the cover element 300 in the push-on direction X, the width b3 of the second region 412 of the guide recess 410 corresponding at least to the width bl of the engagement section 421 of the projection 420, and wherein the Height hl of the engagement section 421 of the projection 420 corresponds at least to the thickness dl of the cover element 300, preferably the thickness in the region of the

Guide recess 410 of the cover element 300.

Furthermore, the width b2 and the length 12 of the end section 422 of the projection 420 are at least slightly smaller than the width b4 and the length 14 of the first region 411 of the guide recess 410.

FIG. 2A shows an engagement section 421 of a projection 420 that is partially pushed into the second region 412 of the guide recess 410. FIG. 2B shows one

Cross-section from the illustration in FIG. 2A along the section A-A, wherein it can be seen that the end section 422 of the projection 420 has a taper against the push-on direction X with respect to its height h2.

Furthermore, it can be seen in FIG. 2B or in FIG. 2C that two thickening elements 423 on one in the pushed-on state of the covering element 300, the covering element 300

opposite side of the end portion 422 of the protrusion 420 is arranged, wherein a distance h3 between the holder 200 and the at least one thickening element 423 is less than the height hl of the engagement portion 421 of the protrusion 420, which

for example in FIG. 2C, which shows a section from the illustration in FIG. 2A along section B-B.

3 and 4 each show an assembled state of the optical

Device 1, in which the cover element 300 is connected to the holder 200 or is completely pushed onto the holder 200. For this purpose, the holder 200 in the example shown has two stop elements 210, which stop elements 210 are set up to limit the displacement of the cover element 300 in the direction of the push-on direction X. The stop elements 210 are arranged on the holder 200, for example, in such a way that an outer edge region or a terminating edge of the cover element 300 abuts or abuts against the stop elements 210 when the cover element 300 is pushed completely onto it.

Furthermore, a locking lug 220 is arranged on the holder 200, which is set up in a fixing recess 320 corresponding to the locking lug 220, which is arranged on the

Cover element 300 is provided to snap into place.

FIG. 5 shows a side view of the assembled optical device 1, the light sources 10, as already mentioned at the beginning, also being shown.

LIST OF REFERENCE NUMBERS

Optical device ... 1

Light sources ... 10

Primary optics ... 100

Basic body ... 101

Light guide body ... 110

Light entry area ... 120

Light exit surface ... 130

Bracket ... 200

Opening area ... 201

Stop element ... 210

Latch ... 220

Cover element ... 300

Opening ... 310

Fixation recess ... 320

Guide recess ... 410

First area ... 411

Second area ... 412

Head start ... 420

Engagement section ... 421

End section ... 422

Thickening element ... 423

Chieberichtung on _S ... X

Claims

1. An optical device (1) for a motor vehicle headlight, the device comprising:

- A primary optics (100) with a base body (101) and with several of that

Base body projecting light guide bodies (110) for forming a desired

Light distribution from the light from light sources, which light guide each one

Light entry surface (120), into which light from light sources can be fed, and have a light exit surface (130),

- A holder (200), on which the base body (101) of the primary optics (100) is arranged on a front side of the holder (200), the light guide body (110) of the primary optics holding the holder (200) through an opening area (201) of the Enforce holder, and

- A cover element (300) which is arranged on a rear side of the holder (200) facing away from the base body (101) of the primary optics (100), the cover element (300) being a number corresponding to the number of light guide bodies (10)

Has light guide bodies corresponding openings (310), which openings (310) are set up to receive the light guide bodies (110) of the primary optics (100) and hold them in position, wherein the cover element (300) by means of at least one on the

Covering element (300) arranged first engagement element can be connected to the holder, which first engagement element engages at least one second engagement element arranged on the holder (200), characterized in that the at least one second engagement element projects from the holder (200)

Projection (420) having an engaging portion (421) having a height (hl) and a width (bl) extending from the holder (200) and an end portion (422) having a height (h2) and a width ( b2) is formed, and wherein the at least one first engagement element is designed as a guide recess (410) in the cover element (300), the guide recess (410) having a first Region (411) and a second region (412) tapered in comparison to the first region, which second region (412) extends along a slide-on direction (X) and has a width (b3) running transversely to the slide-on direction (X), the Projection (420) can be inserted into the first region (411) of the guide recess (410) and can be displaced within the guide recess (410) such that the second region (412) of the guide recess (410) is displaced by means of a displacement of the

Cover element (300) can be pushed in the push-on direction (X) onto the engagement section (421) of the projection (420).

2. Device (1) according to claim 1, characterized in that the width (bl) of the engagement section (421) is smaller than the width (b2) of the end section (422).

3. Device (1) according to claim 1 or 2, characterized in that the width (b3) of the second region (412) of the guide recess (410) corresponds at least to the width (bl) of the engagement section (421) of the projection (420).

4. Device (1) according to one of claims 1 to 3, characterized in that the end portion (422) of the projection (420) has a taper in terms of its height (h2) against the push-on direction (X).

5. Device (1) according to one of claims 1 to 4, characterized in that the cover element (300) has a thickness (dl), the height (hl) of the engagement section (421) of the projection (420) at least the thickness ( dl) of the cover element (300), preferably corresponds to the thickness in the region of the guide recess (410) of the cover element (300).

6. Device (1) according to one of claims 1 to 5, characterized in that the holder (200) has at least one stop element (210), which stop element (210) is set up, the displacement of the cover element (300) in the direction of

Limit postponement (X), preferably at least two

Stop elements (210) are provided.

7. The device (1) according to any one of claims 1 to 6, characterized in that

at least two first engagement elements (410) and at least two to the first

Engagement elements (410) corresponding second engagement elements (420) are provided.

8. The device (1) according to any one of claims 1 to 7, characterized in that

at least one thickening element (423) is arranged on a side of the end section (422) of the projection (420) facing the holder (200), the distance between the holder (200) and the at least one thickening element (423) being less than the height (hl) of the engagement section (421) of the projection (420), preferably at least two thickening elements (423) being arranged on the end section.

9. The device (1) according to one of claims 1 to 8, characterized in that on the holder (200) at least one latching lug (220) is arranged, which is set up in a fixing recess (320) corresponding to the latching lug (220), which on the

Cover element (300) is provided to snap into place.

10. Illumination device with at least one optical device (1) according to one of claims 1 to 9 and one of the number of light guide bodies (110) corresponding number of light-emitting light sources (10), which light for feeding into the at least one optical device (1) is provided.

11. Lighting device according to claim 10, characterized in that each light guide body (110) is assigned exactly one or at least one light source.

12. Light module with at least one lighting device according to claim 10 or 11.

13. Motor vehicle headlight with at least one lighting device according to claim 10 or 11 and / or at least one light module according to claim 12.