Spectacle lens and display device with such a spectacle lens

Patent metadata

Field	Value
Publication number	US-2016178908-A1
Application number	US-201414907534-A
Country	US
Kind code	A1
Filing date	Jul 25, 2014
Priority date	Jul 26, 2013
Publication date	Jun 23, 2016
Grant date	—

Abstract

A spectacle lens is provided for an image-generating display device that can be fitted on the head of a user, wherein, in order to reduce vignetting occurring when guiding the generated image, which is coupled into the spectacle lens via the coupling-in section and guided through the spectacle lens by means of reflections as far as a coupling-out section, the curvature profile of the front and/or rear side in the edge area differs from the corresponding predetermined curvature profile of the front and/or rear side in the edge area such that there is a greater thickness of the spectacle lens in the edge area in comparison with the thickness in the edge area that would result due to the predetermined curvature profile.

First claim

1 . A spectacle lens for an image-generating display device that can be fitted on the head of a user, comprising:
a curved front side and a curved rear side, and, when the spectacle lens is viewed from above, with a coupling-in section in an edge area of the spectacle lens and a coupling-out section spaced apart therefrom, wherein the spectacle lens is configured to couple the generated image into the spectacle lens via the coupling-in section of the spectacle lens, and to guide the generated image in the spectacle lens by reflection as far as the coupling-out section and to couple the generated image out of the spectacle lens via the coupling-out section, wherein the spectacle lens provides a predetermined optical imaging function which is predefined by a predetermined curvature profile of the front side and a predetermined curvature profile of the rear side, and wherein, in order to reduce vignetting occurring when the generated image is guided via the coupling-in section through the spectacle lens as far as the coupling-out section, the curvature profile of at least one of the front and rear sides in the edge area differs from the corresponding predetermined curvature profile of the front and rear sides in the edge area such that there is a greater thickness of the spectacle lens in the edge area in comparison with the thickness in the edge area that would result due to the predetermined curvature profile.

2 . The spectacle lens according to claim 1 , wherein the spectacle lens has the greater thickness only in the edge area.

3 . The spectacle lens according to claim 1 , wherein the edge area with the greater thickness, when the spectacle lens is viewed from above, extends annularly.

4 . The spectacle lens according to claim 1 , wherein the edge area with the greater thickness, when the spectacle lens is viewed from above, extends in the circumferential direction of the spectacle lens along only a part of the circumference and not along the entire circumference.

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

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

7 . The spectacle lens according to claim 1 , wherein the at least one of the coupling-in and coupling-out section provides a folding of the beam path.

8 . The spectacle lens according to claim 1 , wherein only the curvature profile of the rear side in the edge area differs from the corresponding predetermined curvature profile of the rear side in the edge area.

9 . The spectacle lens according to claim 1 , wherein the differing curvature profile is designed such that an imaging error of the spectacle lens, which occurs when the generated image, is guided, is corrected.

10 . The spectacle lens according to claim 1 , wherein the differing curvature profile corresponds to a non-spherical surface.

11 . The spectacle lens according to claim 1 , wherein the edge area begins from a direction of view greater than 20°, 30° or 40°.

12 . The spectacle lens according to claim 1 , wherein the coupling-in section comprises an area of an end face of the spectacle lens connecting the front and rear sides.

13 . The spectacle lens according to claim 12 , wherein the area of the end face has an imaging effect.

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

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

16 . The display device according to claim 15 , wherein the imaging optical system has collimation optics which are arranged between the spectacle lens and the imaging system module.

17 . The display device according to claim 15 , wherein the differing curvature profile is designed such that an imaging error of the imaging optical system is corrected.

18 . The display device according to claim 16 , wherein the differing curvature profile is designed such that an imaging error of the imaging optical system is corrected.

Assignees

• Zeiss Carl Ag

Inventors

• Dobschal Hans-Juergen
• Lindig Karsten

Classifications

• G02C7/086

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

• G02B2027/0118

  comprising devices for improving the contrast of the display / brillance control visibility · CPC title

• G02B27/0176

  characterised by mechanical features · CPC title

• G02B27/0172 Primary

  characterised by optical features · CPC title

• G02B27/30

  Collimators · CPC title