Spectacle lens for a display device that can be fitted on the head of a user and generates an image, and display device with such a spectacle lens

Patent metadata

Field	Value
Publication number	US-10007119-B2
Application number	US-201415025228-A
Country	US
Kind code	B2
Filing date	Sep 25, 2014
Priority date	Sep 27, 2013
Publication date	Jun 26, 2018
Grant date	Jun 26, 2018

Abstract

A spectacle lens for a display device can be fitted on the head of a user and generate an image. A spectacle lens body includes a front side and/or the rear side that are curved, and at least a first and a second partial body, the mutually facing boundary surfaces of which are in direct contact, and as seen in top view onto the spectacle lens, a coupling-in section in an edge area of the spectacle lens and a coupling-out section in a central area of the spectacle lens. The spectacle lens can guide light bundles of pixels of the generated image to the coupling-out section and couple them out of the spectacle lens via the coupling-out section. A flat first reflecting surface and a flat second reflecting surface spaced apart from the first reflecting surface are provided in the spectacle lens body.

First claim

The invention claimed is:

1. A spectacle lens for a display device that can be fitted on the head of a user and generate an image, comprising:
a spectacle lens body comprising a front side and a rear side, wherein at least one of the front side and the rear side are curved, at least a first and a second partial body, the mutually facing boundary surfaces of which are in direct contact, and as seen in top view onto the spectacle lens, a coupling-in section in an edge area of the spectacle lens and a coupling-out section in a central area of the spectacle lens,
wherein the spectacle lens is configured to guide light bundles of pixels of the generated image, which are coupled into the spectacle lens via the coupling-in section of the spectacle lens, in the spectacle lens to the coupling-out section and coupling them out of the spectacle lens via the coupling-out section,
wherein a flat first reflecting surface and a flat second reflecting surface spaced apart from the first reflecting surface are provided in the spectacle lens body, which each extend in a direction from the coupling-in section to the coupling-out section and which are each spaced apart from the front and rear side of the spectacle lens body,
wherein the light bundles are guided by reflections at the two reflecting surfaces in the direction from the coupling-in section to the coupling-out section, and
wherein at least one of the first and second reflecting surfaces is provided in the first or second partial body and is offset from the boundary surface of the corresponding partial body in the direction from the first to the second partial body.

2. The spectacle lens according to claim 1 , wherein the first reflecting surface is provided in the first partial body and spaced apart from the boundary surface of the first partial body and the second reflecting surface is provided in the second partial body and spaced apart from the boundary surface of the second partial body.

3. The spectacle lens according to claim 1 , wherein the first reflecting surface is provided in the first partial body and spaced apart from the boundary surface of the first partial body and the second reflecting surface is formed at the boundary surface of the second partial body.

4. The spectacle lens according to claim 1 , wherein the coupling-out section comprises a pupil expander for the light bundles.

5. The spectacle lens according to claim 1 , wherein the first and second reflecting surfaces are parallel to each other.

6. The spectacle lens according to claim 1 , wherein, in the coupling-out section, a first deflecting section is formed with a reflective Fresnel structure which deflects the light bundles in the direction of the rear side such that they are coupled out via the rear side.

7. The spectacle lens according to claim 6 , wherein the second reflecting surface extends into the coupling-out area and the Fresnel structure lies in front of the second reflecting surface, seen in the direction of the light bundles striking the second reflecting surface.

8. The spectacle lens according to claim 6 , wherein the Fresnel structure comprises several reflective facets which are arranged next to each other in a direction from the edge area to the central area.

9. The spectacle lens according to claim 8 , wherein the facets are formed as partially reflective facets.

10. The spectacle lens according to claim 8 , wherein the transparency of the facets decreases in the direction from the edge area to the central area.

11. The spectacle lens according to claim 8 , wherein, in each case, two directly neighboring facets are connected by a transparent face.

12. The spectacle lens according to claim 8 , wherein the first reflecting surface extends into the coupling-out area and the Fresnel structure lies in front of the first reflecting surface, seen in the direction of the light bundles striking the first reflecting surface.

13. The spectacle lens according to claim 12 , wherein the facets are formed on the first reflecting surface and the area between the facets and the first reflecting surface is filled with a material which corresponds to the material of the partial body in which the first reflecting surface lies.

14. The spectacle lens according to claim 1 , wherein the first and second reflecting surfaces are formed by boundary surfaces of a guide plate which is inserted in at least one of the first and the second partial body.

15. The spectacle lens according to claim 14 , wherein the guide plate projects laterally from the spectacle lens body, wherein the coupling-in section is formed in the laterally projecting part of the guide plate.

16. The spectacle lens according to claim 1 , wherein at least one of the first and the second reflecting surface is formed in at least one of the first and the second partial body.

17. The spectacle lens according to claim 1 , wherein at least one of the first and the second reflecting surface brings about the reflection of the light bundles by total internal reflection.

18. The spectacle lens according to claim 1 , wherein at least one of the first and the second reflecting surfaces are formed by a reflecting layer.

19. The spectacle lens according to claim 1 , wherein a second deflecting section, which deflects the light bundles such that they are guided to the coupling-out section by the reflections at the first and second reflecting surface, is provided in the area of the coupling-in section.

20. The spectacle lens according to claim 1 , wherein at least one of the coupling-in and the coupling-out sections has an imaging effect.

21. The spectacle lens according to claim 1 , wherein the coupling-in section has a collimation effect.

22. The spectacle lens according to claim 1 , wherein the coupling-in section is at least one of refractive and reflective.

23. A display device, comprising:
a holder that can be fitted on the head of a user;
an image-generating module secured to the holder, which generates an image; and
an imaging optical system secured to the holder, which comprises a spectacle lens according to claim 1 and which, when the holder is fitted on the head, images the generated image such that the user can perceive it as a virtual image.

24. A spectacle lens for a display device that can be fitted on the head of a user and generate an image, comprising:
a spectacle lens body comprising a front side and a rear side, wherein at least one of the front side and the rear side are curved and the spectacle lens body is formed in one piece, and as seen in top view onto the spectacle lens, a coupling-in section in an edge area of the spectacle lens and a coupling-out section in a central area of the spectacle lens,
wherein the spectacle lens is configured to guide light bundles of pixels of the generated image, which are coupled into the spectacle lens via the coupling-in section of the spectacle lens, in the spectacle lens to the coupling-out section and coupling the light bundles out of the spectacle lens via the coupling-out section,
wherein a flat first reflecting surface and a flat second reflecting surface spaced apart from the first reflecting surface are provided in the spectacle lens body, which each extend in a direction from the coupling-in section to the coupling-out section and which are each spaced apart from the front and rear side of the spectacle lens body,
wherein the light bundles are guided by means of reflections at the two reflecting surfaces in

Assignees

• Carl Zeiss Smart Optics Gmbh
• tooz technologies GmbH

Inventors

• Dobschal Hans-Juergen
• Lindig Karsten
• Riedel Lisa

Classifications

• G02B2027/011

  comprising device for correcting geometrical aberrations, distortion · CPC title

• G02B2027/0178

  Eyeglass type (eyeglass details G02C) · CPC title

• G02B2027/013

  comprising a combiner of particular shape, e.g. curvature · CPC title

• G02C7/086 Primary

  Auxiliary lenses located directly on a main spectacle lens or in the immediate vicinity of main spectacles · CPC title

• G02B27/0172 Primary

  characterised by optical features · CPC title