Method for optimizing a spectacle lens with a diffraction grating

Patent metadata

Field	Value
Publication number	US-9176330-B2
Application number	US-201113988182-A
Country	US
Kind code	B2
Filing date	Nov 16, 2011
Priority date	Nov 17, 2010
Publication date	Nov 3, 2015
Grant date	Nov 3, 2015

Abstract

A computer-implemented method and a device for optimizing an optical element comprising at least one diffraction grating, wherein at least one refractive surface contributing to the refractive light deflection and/or the at least one diffraction grating of the optical element are/is optimized in such a way as to minimize the color fringe and at least a second-order aberration of the optical element. Also, a corresponding production method and a corresponding device for producing an optical element comprising at least one diffraction grating.

First claim

The invention claimed is:

1. A method for designing and manufacturing an optical element having at least one diffraction grating, the method comprising:
designing, by a computer, at least one refractive surface contributing to refractive light deflection and/or the at least one diffraction grating of the optical element to minimize the color fringe and at least one second-order aberration of the optical element, by minimizing or maximizing a target function, which depends on the at least one second-order aberration and on the longitudinal and/or lateral chromatic aberration(s) of the optical element,
wherein the target function is a target function F 1 :

F
1

=

∑
λ

⁢

F
monochrom

⁡

(
λ
)

,

wherein F monochrom (λ) is a monochromatic target function for the wavelength λ; and wherein the target function F 1 is evaluated for at least two different wavelengths, and
wherein the target function F 1 is a target function:

F
1

=

∑

i
,
λ

⁢

g
Z

⁡

(

i
,
λ

)

⁢

(

Z
Δ

⁡

(

i
,
λ

)

-

Z

Δ
,
target

⁡

(

i
,
λ

)

)

2

+

g
S

⁡

(

i
,
λ

)

⁢

(

S
Δ

⁡

(

i
,
λ

)

-

S

Δ
,
target

⁡

(

i
,
λ

)

)

2

where
Z Δ (i,λ) is the actual value of the amount of the astigmatic error at the i th evaluation point of the optical element for the wavelength λ;
Z Δ,target (i,λ) is the target value of the amount of the astigmatic error at the i th evaluation point of the optical element for the wavelength λ;
S Δ (i,λ) is the actual value of the refractive error at the i th evaluation point of the optical element for the wavelength λ;
S Δ,target (i,λ) is the target value of the refractive error at the i th evaluation point of the optical element for the wavelength λ;
g Z (i,λ) is the weighting of the amount of the astigmatic deviation at the i th evaluation point of the optical element for the wavelength λ; and
g S (i,λ) is the weighting of the refractive error at the i th evaluation point of the optical element for the wavelength λ; and
manufacturing the optical element on the basis of the designed at least one refractive surface and/or the at least one diffraction grating.

2. The method according to claim 1 , wherein both the at least one refractive surface and the at least one diffraction grating of the optical element are designed.

3. A method for designing and manufacturing an optical element having at least one diffraction grating, the method comprising:
designing, by a computer, at least one refractive surface contributing to refractive light deflection and/or the at least one diffraction grating of the optical element to minimize the color fringe and at least one second-order aberration of the optical element, by minimizing or maximizing a target function, which depends on the at least one second-order aberration and on the longitudinal and/or lateral chromatic aberration(s) of the optical element,
wherein the target function is a target function F 2 :

F
2

=

F
monochrom

⁡

Assignees

• Becken Wolfgang
• Esser Gregor
• Altheimer Helmut
• Mueller Werner
• Uttenweiler Dietmar
• Rodenstock Gmbh

Inventors

• Becken Wolfgang
• Esser Gregor
• Altheimer Helmut
• Mueller Werner
• Uttenweiler Dietmar

Classifications

• G02C7/028

  Special mathematical design techniques · CPC title

• G02C7/02 Primary

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

• G02C2202/22

  Correction of higher order and chromatic aberrations, wave front measurement and calculation · CPC title

• G02C7/024 Primary

  Methods of designing ophthalmic lenses · CPC title

• G02C2202/20

  Diffractive and Fresnel lenses or lens portions · CPC title