Set of spectacle lens semifinished products, apparatus for making spectacle lenses and method therefor

Patent metadata

Field	Value
Publication number	US-9733492-B2
Application number	US-201615339755-A
Country	US
Kind code	B2
Filing date	Oct 31, 2016
Priority date	Jul 10, 2014
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

A set of eyeglass lens semifinished products is provided and is composed of at least three series of eyeglass lens semifinished products having spherical or rotationally symmetric aspherical front surfaces. The series of eyeglass lens semifinished products differ in pairs in the base material of the series. Each of the series includes at least three types of eyeglass lens semifinished products which differ in pairs and the front surface shapes. The front surface shapes of the at least three types are identical on a central partial surface within the actual surface refractive power range of the front surface of the series in relation to a standard index of refraction of 1.53 between 3.2 D and 6.7 D.

First claim

What is claimed is:

1. A set of spectacle lens semifinished products, which each have a front surface with a spherical or rotationally symmetric aspherical, convex form, which has at least one physical form feature with an associated form dimension, the set comprising:
a first series of spectacle lens semifinished products made of a base material with a first average refractive index (n d1 ), wherein the first series has pairwise different types of spectacle lens semifinished products which differ in the form dimension of said at least one physical form feature of the form of the front surface thereof, wherein at least three different types of the pairwise different types have an actual surface refractive power value (D n ) of the front surface thereof of between 3.2 D and 6.7 D referred to a standard refractive index (n s ) of 1.53 and determined, in the case of a rotationally symmetric aspherical form of the front surface, at the center of symmetry thereof;
a second series of spectacle lens semifinished products made of a base material with a second average refractive index (n d2 ) different from the first average refractive index (n d1 ), wherein the second series has pairwise different types of spectacle lens semifinished products which differ in the form dimension of the at least one physical form feature of the form of the front surface thereof;
a third series of spectacle lens semifinished products made of a base material with a third average refractive index (n d3 ) that differs from the first average refractive index (n d1 ) and the second average refractive index (n d2 ), wherein the third series has pairwise different types of spectacle lens semifinished products which differ in the form dimension of the at least one physical form feature of the form of the front surface thereof;
at least three different types of the pairwise different types of the second series having an actual surface power value (D n ) of the front surface thereof of between 3.2 D and 6.7 D referred to a standard refractive index (n s ) of 1.53;
at least three different types of the pairwise different types of the third series having an actual surface refractive power value (D n ) of the front surface thereof of between 3.2 D and 6.7 D in relation to a standard refractive index (n s ) of 1.53;
the form dimensions of the at least one physical form feature of the form of the front surfaces of the at least three different types of the first series and the form dimensions of the at least one physical form feature of the form of the front surfaces of the at least three different types of the second series and the form dimensions of the at least one physical form feature of the form of the front surfaces of the at least three different types of the third series being identical, wherein the at least one form feature is:
a) the actual curvature and/or
b) the actual radius of curvature and/or
c) the vertex curvature (ρ) of the conic section of the correction polynomial of the aspherical surface section defined in DIN ISO 10110, consisting of the sum of a conic section and a correction polynomial, in accordance with the equation

z
⁡

(
r
)

=

ρ
⁢

⁢

r
2

1
+

1
-

(

1
+
k

)

⁢

(

ρ
⁢

⁢
r

)

2

+

A
4

⁢

r
4

+

A
6

⁢

r
6

+
…

where z is the sagittal height, r is the incident height, ρ is the vertex curvature and k is the conic constant of the conic section, and A4, A6, . . . are the coefficients of the correction polynomial.

2. The set of spectacle lens semifinished products of claim 1 , wherein the first average refractive index (n d1 ) and the second average refractive index (n d2 ) and the third average refractive index (n d3 ) differ pairwise by at least 0.04, preferably by at least 0.05, more preferably by at least 0.06.

3. The set of spectacle lens semifinished products of claim 1 , wherein:
at least four, preferably at least five, different types of the pairwise different types of the first series, which differ in terms of the form dimension of the at least one physical form feature of the form of the front surface thereof, have an actual surface power value (D n ) of the front surface thereof of between 3.2 D and 6.7 D referred to a standard refractive index (n s ) of 1.53;
at least four, preferably at least five, different types of the pairwise different types of the second series, which differ in terms of the form dimension of the at least one physical form feature of the form of the front surface thereof, have an actual surface power value of the front surface thereof of between 3.2 D and 6.7 D in relation to a standard refractive index (n s ) of 1.53;
at least four, preferably at least five, different types of the pairwise different types of the third series, which differ in terms of the form dimension of the at least one physical form feature of the form of the front surface thereof, have an actual surface power value of the front surface thereof of between 3.2 D and 6.7 D in relation to a standard refractive index of 1.53; and,
the form dimensions of the at least one physical form feature of the form of the front surfaces of the at least four, preferably at least five, different types of the first series and the form dimensions of the at least one physical form feature of the form of the front surfaces of the at least four, preferably at least five, different types of the second series and the form dimensions of the at least one physical form feature of the form of the front surfaces of the at least four, preferably at least five, different types of the third series are identical.

4. The set of spectacle lens semifinished products of claim 1 , wherein:
the first series and the second series

Assignees

• Zeiss Carl Vision Int Gmbh

Inventors

• Michels Georg
• Kratzer Timo
• Nowak Gerd

Classifications

• G02C7/02 Primary

  Lenses; Lens systems {; Methods of designing lenses} · CPC title

• G02C2202/08

  Series of lenses, lens blanks · CPC title

• G02C7/024

  Methods of designing ophthalmic lenses · CPC title

• G02C7/028 Primary

  Special mathematical design techniques · CPC title

• G02C7/022

  Ophthalmic lenses having special refractive features achieved by special materials or material structures (G02C7/049 takes precedence) · CPC title