Patent ID: 11892712
Assignee: CARL ZEISS VISION INTERNATIONAL GMBH
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 6:
7. The product as claimed in claim 1, wherein
(i) the front surface is configured as the freeform surface, wherein a maximum of an absolute value of a mean curvature of the front surface is in an intermediate corridor, and/or
(ii) the back surface is configured as the freeform surface, wherein a minimum of the absolute value of the mean curvature of the back surface is in the intermediate corridor, or
(iii) the back surface has a spherical, rotationally symmetrically aspheric, or toric surface geometry or is a surface having two planes of symmetry and the front surface is configured as the freeform surface, wherein the maximum of the absolute value of the mean curvature of the front surface is in the intermediate corridor, or
(iv) the front surface has a spherical, rotationally symmetrically aspheric, or toric surface geometry or is a surface having two planes of symmetry and the back surface is configured as the freeform surface, wherein the minimum of the absolute value of the mean curvature of the back surface is in the intermediate corridor, or
(v) the back surface is not configured as the freeform surface and the front surface is configured as the freeform surface, wherein the maximum of the absolute value of the mean curvature of the front surface is in the intermediate corridor, or
(vi) the front surface is not configured as the freeform surface and the back surface is configured as the freeform surface, wherein the minimum of the absolute value of the mean curvature of the back surface is in the intermediate corridor.