US 11,740,488 B2
Progressive spectacle lens having a variable refractive index and method for the design and production thereof
Gerhard Kelch, Aalen (DE); Christoph Menke, Oberkochen (DE); and Helmut Wietschorke, Aalen (DE)
Assigned to Carl Zeiss Vision International GmbH, Aalen (DE)
Filed by Carl Zeiss Vision International GmbH, Aalen (DE)
Filed on Jan. 20, 2021, as Appl. No. 17/153,595.
Application 17/153,595 is a continuation of application No. PCT/EP2019/069557, filed on Jul. 19, 2019.
Claims priority of application No. PCT/EP2018/069806 (WO), filed on Jul. 20, 2018.
Prior Publication US 2021/0199991 A1, Jul. 1, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G02C 7/02 (2006.01); G02C 7/06 (2006.01)
CPC G02C 7/027 (2013.01) [G02C 7/022 (2013.01); G02C 7/024 (2013.01); G02C 7/028 (2013.01); G02C 7/065 (2013.01); G02C 7/068 (2013.01); G02C 2202/12 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A product comprising:
(i) a progressive power spectacle lens, or (ii) a representation of the progressive power spectacle lens having instructions for the production thereof using an additive method, the representation being stored on a non-transitory data medium in the form of computer-readable data, or (iii) the non-transitory data medium with a virtual representation of the progressive power spectacle lens in the form of the computer-readable data having instructions for the production thereof using an additive method, or (iv) the representation of the progressive power spectacle lens in the form of the computer-readable data signal having instructions for the production thereof using an additive method, wherein the progressive power spectacle lens has:
a substrate having no individual parts forming discrete interfaces and having a spatially varying refractive index; and
the substrate having a front surface and a back surface,
wherein, during use as intended, the front surface and the back surface of the substrate either form the outer surfaces of the progressive power spectacle lens, or
one of the front surface or the back surface forms one of the outer surfaces, wherein a functional coating is provided on the other of the front surface or the back surface, wherein the functional coating does not contribute or at each point contributes less than 0.004 dpt to a spherical equivalent of a dioptric power of the progressive power spectacle lens and forms the other of the outer surfaces, or
the outer surfaces are formed by the functional coatings provided on each of the front surface and back surface of the substrate, wherein the functional coatings do not contribute or at each point contribute less than 0.004 dpt to the spherical equivalent of the dioptric power of the progressive power spectacle lens,
wherein at least one of the front surface or the back surface of the substrate is configured as a freeform surface, and
wherein
(a) the refractive index varies only in a first spatial dimension and in a second spatial dimension and is constant in a third spatial dimension, wherein a distribution of the refractive index in the first spatial dimension and the second spatial dimension has neither point symmetry nor axial symmetry.