ILLUMINATION DEVICE FOR VEHICLES

Abstract

An illumination device for vehicles is provided, and includes a headlamp with an imaging unit for generating a multitude of light pixels that can be actuated individually. The headlamp also includes a lens unit containing a lens arrangement with a number of lenses arranged in a fixed manner to each other. The light pixels of the imaging unit can be mapped to focused light spots at a specified distance. The headlamp also includes an actuator unit for actuating the imaging unit. A first lens unit of a first headlamp is different from a second lens unit of a second headlamp such that the light pixels of the imaging unit of the first headlamp and the second headlamp are mapped to be focused at different distances.

Claims

1. An illumination device for vehicles, the illumination device comprising: a first headlamp and a second headlamp, each of said first and second headlamps including: an imaging unit for generating a multitude of light pixels (P.sub.11, P.sub.12, . . . P.sub.nm) that can be actuated individually; a lens unit containing a lens arrangement with a number of lenses arranged in a fixed manner to each other by which the light pixels (P.sub.11, P.sub.12, . . . P.sub.nm) of the imaging unit are mapped to focused light spots (F.sub.11, F.sub.12, F.sub.11, F.sub.12) at a specified distance; and an actuator unit for actuating the imaging unit, wherein the first headlamp is arranged in a first corner area of the vehicle and the second headlamp is arranged in a second corner area of the vehicle, wherein the respective light pixels (P.sub.11, P.sub.12, . . . P.sub.nm) of the imaging unit of the first headlamp and of the second headlamp are mapped to be focused at different distances.

2. The illumination device in accordance with claim 1, wherein the imaging unit of the first headlamp is identical to the imaging unit of the second headlamp, and wherein corresponding light sources of the imaging unit of the first headlamp and of the second headlamp arranged at the same place are mapped to be focused at different distances.

3. The illumination device in accordance with claim 1, wherein the actuator unit includes a first actuator (A1) such that a first part of the light pixels (P.sub.11, P.sub.12, . . . P.sub.nm) of the imaging unit of the first headlamp are actuated such that the first part of the light pixels (P.sub.11, P.sub.12, . . . P.sub.nm) are mapped in a first near field, and the actuator unit includes a second actuator (A2) such that a first part of the light pixels (P.sub.11, P.sub.12, . . . P.sub.nm) of the imaging unit of the second headlamp are actuated such that the first part of the light pixels (P.sub.11, P.sub.12, . . . P.sub.nm) are mapped to be focused in a second near field, wherein the second near field is arranged at a distance at least three times as far to the left headlamp as the first near field to the right headlamp.

4. The illumination device in accordance with claim 1, wherein the actuator unit includes an actuator such that a second part of the light pixels (P.sub.11, P.sub.12, . . . P.sub.nm) of the imaging unit of the first headlamp and of the second headlamp are actuated in such a way that the specified light distribution is generated in a far field.

5. The illumination device in accordance with claim 3, wherein the actuator unit includes a first actuator program for actuating the actuator (A1) such that in a first near field, a moving image is generated that is composed in each case of the light pixels (P.sub.11, P.sub.12, . . . P.sub.nm) mapped from light patches (F.sub.11, F.sub.12, . . . F.sub.nm) of differing part segments of the first part of the imaging unit.

6. The illumination device in accordance with claim 3, wherein the actuator unit includes a second actuator program for actuating the second actuator (A2) such that in a second near field, a symbol is generated that is composed of the first part of the light pixels (P.sub.11, P.sub.12, . . . P.sub.nm) of the imaging unit mapped from light patches (F.sub.11, F.sub.12, . . . F.sub.nm).

7. The illumination device in accordance with claim 3, wherein the first near field is arranged in the area of a distance of 3 m to the first headlamp.

8. The illumination device in accordance with claim 3, wherein the second near field is arranged in the area of a distance between 10-m and 15-m the second headlamp.

9. The illumination device in accordance with claim 1, wherein the imaging unit includes a plurality of light sources arranged in the form of a matrix.

10. The illumination device in accordance with claim 9, wherein the light sources are RGB light sources.

11. The illumination device in accordance with claim 6, wherein the second actuator program is designed in such a way that the symbol in the second near field and the light distribution are generated in the far field.

12. The illumination device in accordance with claim 1, wherein the optical unit includes a lens arrangement including at least four lenses.

13. The illumination device in accordance with claim 12, wherein the lens arrangement includes at least one convex lens and one concave lens to form an achromatic lens.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Reference is now made more particularly to the drawings, which illustrate the best presently known mode of carrying out the invention and wherein similar reference characters indicate the same parts throughout the views. One sample embodiment of the invention is explained in more detail in the following using the drawings.

[0014] FIG. 1 is a block diagram of the inventive illumination device.

DETAILED DESCRIPTION OF THE DRAWINGS

[0015] An inventive illumination device for vehicles 25 comprises a first headlamp that is arranged as a right headlamp 1 in a right corner area at a front of the vehicle 25 and a second headlamp fashioned as a left headlamp 2 that is arranged in a second corner area of a front of the vehicle 25. The right headlamp 1 and the left headlamp 2 feature in each case a housing in which an imaging unit 3 and an optical unit 4, 4 are arranged. The imaging unit 3 of the right headlamp 1 and the imaging unit 3 of the left headlamp 2 are fashioned identically and are consequently marked with the same reference number. The imaging unit 3 features a plurality of light sources 5, in particular Light sources, arranged in the form of a matrix. In each case, the light sources 5 form light pixels P.sub.11, P.sub.12, . . . P.sub.nm that are mapped by means of the optical unit 4, 4.

[0016] In accordance with an alternative embodiment of the invention (not shown), the imaging unit 3 can also feature a liquid crystal unit (LCD display) or as an LCoS (liquid crystal on silicon) unit and a light source unit. In this context, the liquid crystal elements arranged in the form of a matrix or in the form of pixels serve as aperture elements that either let light from the light source through or block it. As an alternative, the imaging unit 3 can feature a light source unit and a micromirror device (DMD), wherein individual micromirror elements of the micromirror elements are arranged in the form of a matrix or in the form of pixels in the range of several millions such that it can be swivelled. The micromirror elements have at least one on state in which the light from the light source unit is directed onto the optical unit 4, 4, and at least one off state in which the light emitted by the light source unit is absorbed. The mapping of the imaging unit 3 creates a high resolution right headlamp 1 and a high resolution left headlamp 2.

[0017] The right headlamp 1 features a first optical unit 4 that consists of a lens arrangement with a plurality of lenses 6. The left headlamp 2 features a second optical unit 4 thatlike the first optical unit 4features a plurality of lenses 6. In the present sample embodiment, the first optical unit 4 and the second optical unit 4 each feature four lenses 6, wherein a first convex lens 6 and a second convex lens 6 form an achromatic lens 7 to compensate for a colour error.

[0018] The first optical unit 4 and the second optical unit 4 differ in that at least one lens 6 is fashioned to be shaped differently such that the first optical unit 4 and the second optical unit 4 feature a different focal length.

[0019] The higher focal length of the second optical unit 4 has the effect that the light pixels P.sub.11, P.sub.12, . . . P.sub.nm of the imaging unit 3 of the left headlamp 2 are mapped to be focused at such a distance to the left headlamp 2 that is at least three times as long as the distance at which light pixels P.sub.11, P.sub.12, . . . P.sub.nm of the imaging unit 3 of the right headlamp 1 are mapped to be focused.

[0020] Furthermore, the illumination device comprises an actuator unit 8 that is arranged outside of the right headlamp 1 and the left headlamp 2 or in the right headlamp 1 or in the left headlamp 2. Optionally, the actuator unit 8 can consist of two actuator units each of which are arranged in the right headlamp 1 and the left headlamp 2.

[0021] The actuator unit 8 features a first actuator program 9 that is integrated in a microcontroller such that the first actuation A1 are generated by means of which a first part 10 of the light pixels P.sub.11, P.sub.12, . . . P.sub.nm of the imaging unit 3 of the right headlamp 1 are actuated in such a way that this first part 10 of the light pixels P.sub.11, P.sub.12, . . . P.sub.nm are mapped in a first near field 11 to a focused mapping. In the present sample embodiment, the focused mapping a sequence of images 12 moving in a direction crosswise to the vehicle axis, containing a plurality of light patches F.sub.11, F.sub.12, . . . F.sub.nm arranged adjacent to each other. The first near field 11 can be arranged in an area at a distance of 3 m to the right headlamp 1 such that a wall or garage wall can be used as a screen for showing a film or a sequence of images. As the moving image 12 is generated by light pixels P.sub.11, P.sub.12, . . . P.sub.nm actuated at different times, the first part 10 of the light sources 5 consists of a first part segment 13, a second part segment 14 and, where applicable, further part segments that are actuated or switched on in a dimmed state successively by the actuation A1. In this way, a first image 12 of the moving image 12 corresponds to the first part segment 13 and a second image 12 of the moving image 12 to the second part segment 14.

[0022] A second part 16 of the light pixels.sub.11, P.sub.12, . . . P.sub.nm arranged in the imaging unit 3 of the right headlamp 1 is actuated by the actuator A1 in such a way that a specified light distribution 17 is generated in a far field 18. The light distribution 17 can be, for example, a low-beam light distribution or a glare-free high-beam light distribution or an urban light distribution or the like. The far field 18 is located at a greater distance to the right headlamp 1 than the first near field 11.

[0023] The actuator unit 8 features a second actuator program 19 for generating actuation A2, by means of which light sources 5 of the imaging unit 3 arranged in the left headlamp 2 are actuated. By means of the second actuator program 19, a first part 20 of the light sources 5 of the imaging unit 3 of the left headlamp 2 is actuated in such a way that this part 20 of the light sources 5 are mapped to be focused in a second near field 21 to a mapping with a plurality of light patches F.sub.11, F.sub.12, . . . F.sub.nm arranged adjacent to each other. This mapping can be, for example, a symbol, in particular an arrow 22, that is projected onto the road surface and acts as an information or warning signal for the driver of the vehicle 25. The second near field 21 can be arranged in an area at a distance between 10 m and 15 m to the left headlamp 2. It is at a distance of more than three times as far from the left headlamp 2 emitting the corresponding light than the first near field 11 from the right headlamp 1.

[0024] In addition, the second actuator program 19 is designed in such a way that a second part 23 of the light sources 5 of the imaging unit 3 of the left headlamp 2 are actuated by means of the actuator A2 such that the corresponding light sources 5 are mapped by means of the second optical unit 4 to the light distribution 17 in the far field 18. The first optical unit 4 and the second optical unit 4 thus form the same light distribution 17, such that the actual main function of the right headlamp 1 and of the second left headlamp 2 are fulfilled. The secondary function of the right headlamp 1 is the mapping of an image in the first near field 11 and the secondary function of the left headlamp 2 is the mapping of an image in the second near field 21. The mapping of the images in the first near field 11 and the second near field 21 can be performed independently of each other and independently of the mapping of the light distribution 17 in the far field 18.

[0025] The symbol 22 consists of a plurality of light patches F.sub.11, F.sub.12, . . . F.sub.nm mapped to be focused.

[0026] The light patches F.sub.11, F.sub.12, . . . F.sub.nm or, as the case may be, F.sub.11, F.sub.12, . . . F.sub.nm are considerably smaller in their dimensions that the light patches 24 of the light distribution 17.

[0027] The mapping of the light pixels to light patches 24 of the light distribution 17 in the far field 18 is relatively unfocused, which is accepted as harmonious illumination over an area is the crucial factor. A correspondingly high resolution of the light pixels with increasing numbers of light sources makes it possible, for example, to create the light distribution as a glare-free high-beam light distribution leaving out objects recognised ahead of the vehicle. The far field 18 is at a distance further away from the respective headlamp 1 or 2, than the first near field 11 and the second near field 21 from the respective headlamps 1 or 2.

[0028] In accordance with an alternative embodiment of the invention (not shown), the imaging unit 3 of the right headlamp 1 can feature a different number of light sources 5 than the imaging unit 3 of the left headlamp 2. For example, the imaging unit 3 of the right headlamp 1 can feature a permanently allocated first part 10 of the light sources 5 for generating the image in the first near field 11 and a permanently allocated second part 16 of the light sources 5 for generating the light distribution in the far field 18. Dual use of the light sources 5 for generating the first near field 11 and for generating the light distribution 17 is not provided for in this case.

[0029] In accordance with an alternative embodiment of the invention, the first optical unit 4 can also be arranged in the left headlamp 2 and the second optical unit 4 in the right headlamp 1.

LIST OF REFERENCE NUMBERS

[0030] 1 Right headlamp [0031] 2 Left headlamp [0032] 3 Imaging unit [0033] 4,4 Optical unit [0034] 5 Light sources [0035] 6,6,6 Lenses [0036] 7 Achromatic lens [0037] 8 Actuator unit [0038] 9 First actuator program [0039] 10 First part [0040] 11 First near field [0041] 12,12,12 moving images [0042] 13 First part segment [0043] 14 Second part segment [0044] 15 3. part segment [0045] 16 Second part [0046] 17 light distribution [0047] 18 Far field [0048] 19 Second actuator program [0049] 20 First part [0050] 21 Second near field [0051] 22 Symbol [0052] 23 Second part [0053] 24 Light patches [0054] 25 Vehicle [0055] P.sub.11,P.sub.12, . . . P.sub.nm Light pixels [0056] A1,A2 Actuator [0057] F.sub.11,F.sub.12, . . . F.sub.nm Light patches [0058] F.sub.11,F.sub.12, . . . F.sub.nm