Illumination device and method for manufacturing an illumination device

1. An illumination device comprising:

a light emitting element; and

an optical device with a first lens and a second lens,

wherein the light emitting element has an emission surface on a side facing the optical device,

wherein the optical device is subordinated to the light emitting element in a radiation direction,

wherein the first lens is arranged on a side of the optical device facing the light emitting element,

wherein a material, which has a refractive index different from a material of the first lens, is arranged between the first lens and the light emitting element,

wherein a first surface of the first lens facing the light emitting element has a radius of curvature of at least 200 mm and a second surface of the first lens facing away from the light emitting element has a radius of curvature of at least 200 mm, and

wherein the first lens has a thickness of at least twice an edge length of the emission surface.

2. The illumination device according to claim 1 , wherein the material of the first lens comprises a refractive index of at least 1.6.

3. The Illumination device according to claim 1 , wherein the material of the first lens has an Abbe number of at most 50.

4. The illumination device according to claim 1 , wherein the optical device is configured to generate a spherical aberration, and wherein the optical device is configured to compensate the spherical aberration by a beam offset along an optical axis of the optical device due to a thickness of the first lens.

5. The illumination device according to claim 1 , wherein at least one of the first surface or the second surface is plane.

6. The illumination device according to claim 5 , wherein the first and second surfaces are parallel to each other.

7. The illumination device according to claim 1 , wherein an angle between a main beam and an optical axis is at most 2° on the side of the optical device on which the light emitting element is arranged.

8. The illumination device according to claim 1 , wherein a numerical aperture of the optical device is at least 0.5.

9. The illumination device according to claim 1 , wherein a distance between the emission surface and the first surface is at most a length of the edge length of the emission surface.

10. The illumination device according to claim 1 ,

wherein the second lens is arranged on a side of the optical device facing away from the light emitting element, and

wherein a material of the second lens comprises an Abbe number of greater than 55.

11. The illumination device according to claim 1 ,

wherein the light emitting element is arranged in a housing, and

wherein the housing and the first lens are mechanically fixedly connected to each other.

12. The illumination device according to claim 1 , wherein a gaseous material is disposed between the emission surface and the first surface.

13. The illumination device according to claim 1 , wherein the first lens has an anti-reflection layer on at least one of the first surface or the second surface.

14. The illumination device according to claim 1 , wherein the first lens is at least partially coated with an absorption layer.

15. The illumination device according to claim 1 , wherein the light emitting element comprises a pixelated light emitting semiconductor chip or a plurality of light emitting semiconductor chips.

16. The illumination device according to claim 1 , wherein the light emitting element is cohesively connected to a drive device.

17. The illumination device according to claim 1 , wherein the emission surface comprises a dielectric layer structure.

18. A method for manufacturing an illumination device, the method comprising:

providing light emitting elements, wherein each light emitting element has an emission surface with an edge length;

arranging each light emitting element in a housing of a first composite of housings;

providing a plurality of first lenses in a second composite, wherein each first lens has a thickness, which is, perpendicular to a main extension plane of the first composite, at least twice as large of the edge length of the emission surface;

cohesively connecting the first and second composites with each other;

separating the housings and the first lenses, wherein, after the separation, exactly one lens with a thickness and one housing are assigned to each light emitting element, and wherein the first lens forms at least a part of a side of an optical device facing the emission surface; and

arranging a second lens in a radiation direction of the light emitting elements.

19. An illumination device comprising:

a light emitting element; and

an optical device with a first lens,

wherein the optical device is subordinated to the light emitting element in a radiation direction,

wherein the first lens is arranged on a side of the optical device facing the light emitting element,

wherein a material, which has a refractive index different from a material of the first lens, is arranged between the first lens and the light emitting element,

wherein a first surface of the first lens facing the light emitting element has a radius of curvature of at least 200 mm and a second surface of the first lens facing away from the light emitting element has a radius of curvature of at least 200 mm,

wherein a spherical aberration occurs in the optical device during operation of the illumination device, and

wherein due to a thickness of the first lens, a beam offset along an optical axis of the optical device compensates the spherical aberration of the optical device.

20. The illumination device according to claim 19 , wherein at least one of the first surface or the second surface is plane.