Method for manufacturing diffractive multi-focal ophthalmic lens and diffractive multi-focal ophthalmic lens

Patent metadata

Field	Value
Publication number	US-10295841-B2
Application number	US-201515500589-A
Country	US
Kind code	B2
Filing date	Aug 5, 2015
Priority date	Aug 8, 2014
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

A method for manufacturing a diffractive multi-focal ophthalmic lens capable of generating at least three focal points in an optical axis direction using a diffractive structure comprising a plurality of zones in a concentric circle form. A composite profile is generated by overlapping at least two starting profiles comprising a plurality of zones in a concentric circle form, and an adjusted profile is generated in which at least one of phase and amplitude is adjusted by employing a zone of the composite profile as a subject in order to set an intensity distribution in the optical axis direction and determine optical characteristics, to manufacture the diffractive multi-focal ophthalmic lens for which the adjusted profile is provided in at least a portion of the diffractive structure.

First claim

The invention claimed is:

1. A method for manufacturing a diffractive multi-focal ophthalmic lens capable of generating at least three focal points in an optical axis direction using a diffractive structure comprising a plurality of zones in a concentric circle form, the method comprising:
generating a composite profile by overlapping at least two starting profiles comprising a plurality of zones in a concentric circle form;
generating an adjusted profile by adjusting at least one of phase and amplitude with a zone of the composite profile as a subject in order to set an intensity distribution in the optical axis direction and determine optical characteristics; and
manufacturing the diffractive multi-focal ophthalmic lens for which the adjusted profile is provided in at least a portion of the diffractive structure, wherein
the at least two starting profiles all have a phase expressed as a blaze shaped function in relation to a lens radial distance in at least a portion of a region overlapped, and the phase of the composite profile is also expressed as a blaze shaped function, and
the blaze shaped function of the composite profile is expressed by Equation 1

ϕ
⁡

(
r
)

=

ϕ
i

-

ϕ

i
-
1

r
i

-

r

i
-
1

×
r

+

ϕ

i
-
1

×

r
i

-

ϕ
i

×

r

i
-
1

r
i

-

r

i
-
1

+
τ

[

Equation
⁢

⁢
1

]

r: Radial distance from the lens center
r i−1 : Inner diameter of the ith zone (radius)
r i : Outer diameter of the ith zone (radius)
ϕ i−1 : Phase at the inner diameter (radius) position of the ith zone
ϕ i : Phase at the outer diameter (radius) position of the ith zone
τ: Phase shift.

2. The method for manufacturing the diffractive multi-focal ophthalmic lens according to claim 1 , wherein
adjustment of the phase with the zone of the composite profile as the subject is performed by varying at least one of a phase constant h expressed by Equation 2 using ϕ i and ϕ i−1 of Equation 1, and a phase shift τ of Equation 1

h
=

ϕ

i
-
1

-

ϕ
i

2
⁢
π

.

[

Equation
⁢

⁢
2

]

3. The method for manufacturing the diffractive multi-focal ophthalmic lens according to claim 2 , wherein
when adjusting the phase of the composite profile, the adjusted profile is set so as to include the zones for which the phase constant h changes periodically in a radial direction.

4. The method for manufacturing the diffractive multi-focal ophthalmic lens according to claim 2 , wherein
when adjusting the phase of the composite profile, the adjusted profile is set so as to include the zones for which the phase shift τ changes periodically in a radial direction.

5. The method for manufacturing the diffractive multi-focal ophthalmic lens according to claim 1 , wherein
adjustment of the amplitude of the composite profile is performed by adjusting a light transmittance in the zone of the composite profile.

6. The method for manufacturing the diffractive multi-focal ophthalmic lens according to claim 5 , wherein
when adjusting the amplitude of the composite profile, the adjusted profile is set so as to include the zones for which the light transmittance changes periodically in a radial di

Assignees

• Menicon Co Ltd

Inventors

• Ando Ichiro

Classifications

• G02C7/044

  Annular configuration, e.g. pupil tuned · CPC title

• G02C2202/20

  Diffractive and Fresnel lenses or lens portions · CPC title

• A61F2/1654

  Diffractive lenses · CPC title

• A61F2/1616

  Pseudo-accommodative, e.g. multifocal or enabling monovision · CPC title

• G02C2202/08

  Series of lenses, lens blanks · CPC title