# US 2022/0034464 A1 · Lighting device for a vehicle

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- Number: US 2022/0034464 A1
- Document ID: US20220034464A1
- Status: Published application
- Kind: A1
- Application number: 17/279,964
- Filed: 2019-09-25
- Published: 2022-02-03
- Earliest claimed: 2018-09-26
- Assignees: Carl Zeiss Jena GmbH
- Applicants: Carl Zeiss Jena GmbH
- Inventors: Matthias CUMME; Arnaud DEPARNAY; Roman KLEINDIENST
- Web page: https://patentgrep.com/patent/US20220034464A1

## CPC

- F21S 41/24: Light guides
- G02B 19/0028: {refractive and reflective surfaces, e.g. non-imaging catadioptric systems}
- F21S 41/143: the main emission direction of the LED being parallel to the optical axis of the illuminating device
- F21S 41/151: arranged in one or more lines
- F21S 41/285: {Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805}
- F21S 41/322: {the reflector using total internal reflection}
- G02B 5/0221: {the surface having an irregular structure (G02B5/0226 takes precedence)}
- G02B 5/0252: {using holographic or diffractive means}
- G02B 5/0278: {used in transmission}
- G02B 19/0061: {the light source comprising a LED}
- F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A lighting device is provided, comprising a spatially extended light source with a light-emitting surface greater than 0.5 mm2 and also an aspherical TIR lens, which is configured to collimate light from the spatially extended light source, and a refractive diffuser configured to generate a lighting distribution on the basis of the collimated light.

## Claims

### Claim 1

A lighting device, comprising:
a spatially extended light source with a light-emitting surface greater than 0.5 mm2,
an aspherical TIR lens, which is configured to collimate light from the spatially extended light source, and
a refractive diffuser, which is configured to generate a lighting distribution on the basis of the collimated light.

### Claim 2 (depends on 1)

The lighting device as claimed in claim 1, wherein the refractive diffuser is an achromatic refractive diffuser.

### Claim 3 (depends on 1)

The lighting device as claimed in claim 1, wherein the refractive diffuser is configured to receive the collimated light with a residual divergence, wherein the refractive diffuser is configured to generate the lighting distribution on the basis of the collimated light with the residual divergence.

### Claim 4 (depends on 1)

The lighting device as claimed in claim 1, wherein the achromatic refractive diffuser has an optical diffuser surface that is configured to provide the lighting distribution on the basis of the collimated light, wherein the diffuser surface is continuously differentiable.

### Claim 5 (depends on 4)

The lighting device as claimed in claim 4, wherein the diffuser surface has stochastically distributed structures with convex and concave structure parts, wherein the structure parts have lateral dimensions of 15 μm-500 μm.

### Claim 6 (depends on 1)

The lighting device as claimed in claim 1, wherein the lighting distribution has one or a plurality of the following shapes:
a symmetric shape, an asymmetric shape, a round shape, a square shape, an elliptical shape.

### Claim 7 (depends on 1)

The lighting device as claimed in claim 1, wherein the lighting distribution has one or a plurality of the following intensity distributions:
a homogeneous intensity distribution, a top-hat-shaped intensity distribution, a Gaussian intensity distribution, a super-Gaussian intensity distribution.

### Claim 8 (depends on 1)

The lighting device as claimed in claim 1, wherein the aspherical TIR lens is not rotationally symmetric and wherein the aspherical TIR lens is located in a solid angle range, starting from a center point of the spatially extended light source, wherein the solid angle range substantially comprises the half-space around the spatially extended light source.

### Claim 9 (depends on 1)

The lighting device as claimed in claim 1, wherein the spatially extended light source has a shape comprising a first length in a first direction and a second length in a second direction, which differs from the first direction, wherein the first length is greater than the second length.

### Claim 10 (depends on 9)

The lighting device as claimed in claim 9, wherein the aspherical TIR lens has a first extent in the first direction and a second extent in the second direction, wherein the first extent is greater than the second extent.

### Claim 11 (depends on 9)

The lighting device as claimed in claim 9, wherein the aspherical TIR lens is configured to generate a substantially rotationally symmetric collimation of the spatially extended light source.

### Claim 12 (depends on 1)

The lighting device as claimed in claim 1, wherein the aspherical TIR lens has an axis, a first surface, a second surface, an exit surface, and a reflector surface, wherein:
the axis extends through the spatially extended light source, the exit surface is planar and extends perpendicularly to the axis, wherein the exit surface provides the collimated light,
the first surface has a bi-aspheric shape and intersects the axis, the second surface has a free form and does not intersect the axis and wherein the reflector surface has a paraboloid shape.

### Claim 13 (depends on 12)

The lighting device as claimed in claim 12, wherein the aspherical TIR lens comprises a joint region between the first and the second surface, wherein the joint region has a surface shape that does not fall below a production radius and is designed in such a way that a light component from the spatially extended light source that passes through the joint region is deflected in such a way that the light component substantially does not influence the lighting distribution.

### Claim 14 (depends on 13)

The lighting device as claimed in claim 13, wherein a proportion of at least 70% of the light component is directed in the direction of the exit surface and not toward the reflector surface.

### Claim 15 (depends on 14)

The lighting device as claimed in claim 14, wherein the proportion is more than 95%.

### Claim 16 (depends on 12)

The lighting device as claimed in one of claim 12, wherein the free form of the second surface is defined by means of Q polynomials.

### Claim 17 (depends on 1)

The lighting device as claimed in claim 1, wherein the refractive diffuser comprises at least one region which contains a hybrid structure, wherein the hybrid structure comprises a combination of an achromatic refractive diffuser with a globally acting diffractive structure.

### Claim 18 (depends on 17)

The lighting device as claimed in claim 17, wherein the globally acting diffractive structure comprises a Fresnel lens.

### Claim 19 (depends on 12)

The lighting device as claimed in claim 12, wherein the at least one region fills at least part of a projection of the first surface and/or the second surface onto the refractive diffuser.

### Claim 20 (depends on 1)

The lighting device as claimed in claim 1, wherein the aspherical TIR lens and the refractive diffuser are formed in one piece as one component.

### Claim 21 (depends on 20)

The lighting device as claimed in claim 20, wherein the refractive diffuser is formed in one piece with the exit surface of the aspherical TIR lens.

### Claim 22 (depends on 1)

The lighting device as claimed in claim 1, wherein the aspherical TIR lens and/or the refractive diffuser are produced by way of an injection molding method.

### Claim 23 (depends on 1)

The lighting device as claimed in claim 1, wherein the lighting device is embodied as a lighting device for a vehicle.