Set of semi-finished lenses with holographic components

Patent metadata

Field	Value
Publication number	US-12474580-B2
Application number	US-202017620307-A
Country	US
Kind code	B2
Filing date	Jun 19, 2020
Priority date	Jun 21, 2019
Publication date	Nov 18, 2025
Grant date	Nov 18, 2025

Abstract

A method for manufacturing a set of semi-finished lenses and a lens from a semi-finished lens of the set and a set of semi-finished lenses each intended to be used in the manufacturing of a finished lens of determined target power, each semi-finished lens having a base curve chosen among a number N of base curves, wherein each base curve is associated to a respective range of powers of finished ophthalmic lenses to be manufactured, and each semi-finished lens of the set comprises a recorded holographic component, wherein the holographic components of the set exhibit a limited number of configurations, and each holographic component configuration is associated exclusively to one base curve among the N base curves.

First claim

What is claimed is:

1 . A set of semi-finished ophthalmic lenses, wherein each semi-finished ophthalmic lens is used in manufacturing of a finished ophthalmic lens of determined target power, comprising:
a plurality of semi-finished ophthalmic lenses, each semi-finished lens having a base curve chosen among a number N of base curves, N being lower than 10, and including a holographic component recorded according to a holographic component configuration chosen among a limited number M of holographic components configurations, M being superior or equal to N, wherein each base curve among the N base curves is associated to a respective range of target powers of finished ophthalmic lenses to be manufactured from the semi-finished lenses having said base curve, each range of target powers being defined by minimum and maximum target power values, and all the ranges being centered on respectively different target power values, and each holographic component configuration among the M holographic component configurations is associated to a single base curve among the N base curves, such that two semi-finished ophthalmic lenses of the set have a holographic component according to a same holographic component configuration only when the two semi-finished ophthalmic lenses of the set have the same base curve, and each holographic component configuration associated to a base curve is configured such that the holographic component has an optical power adapted to a middle power of the range of target powers corresponding to the base curve.

2 . The set of semi-finished ophthalmic lenses according to claim 1 , wherein the plurality of semi-finished lenses have a same base curve and different diameters.

3 . The set of semi-finished ophthalmic lenses according to claim 1 , wherein each semi-finished lens is made of a low-birefringence material.

4 . The set of semi-finished ophthalmic lenses according to claim 1 , wherein each semi-finished lens is a plano lens.

5 . The set of semi-finished ophthalmic lenses according to claim 1 , wherein the holographic components are holographic mirrors configured to reflect a virtual image generated by an image source, and
wherein each base curve is associated to a plurality of holographic mirror configurations among the limited number of configurations, said plurality of holographic mirror configurations associated to a determined base curve including: at least two holographic mirror configurations adapted to different ranges of pupillary distances of wearers, at least two holographic mirror configurations adapted to different image sources generating a virtual image to be reflected by a mirror, or at least two holographic mirror configurations adapted to reflect different ranges of wavelengths.

6 . The set of semi-finished lenses according to claim 1 , wherein the number of base curves is lower than 10, and each base curve is associated to a number of holographic component configurations lower than 5.

7 . The set of semi-finished lenses according to claim 1 , wherein each semi-finished lens comprises two opposite main surfaces, a holographic component is recorded on one main surface of each semi-finished lens, and each semi-finished lens further comprises an anti-reflection coating on other main surface.

8 . A method of manufacturing a set of semi-finished ophthalmic lenses wherein each semi-finished ophthalmic lens is used in the manufacturing of a finished ophthalmic lens of determined target power, the method comprising:
determining a number N of target power ranges, each range of target powers being defined by minimum and maximum target power values, and all the ranges being centered on respectively different target power values; for each determined target power range, determining a respective base curve of a semi-finished lens such that the base curve is suitable to be used in the manufacturing of a finished ophthalmic lens having a power within the determined target power range, wherein each semi-finished lens has the base curve chosen among a number N of base curves, N being lower than 10, and including a holographic component recorded according to a holographic component configuration chosen among a limited number M of holographic components configurations, M being superior or equal to N; for each base curve among the N base curves, determining a respective holographic component configuration of a holographic component to be recorded on a semi-finished lens having said base curve; and manufacturing at least one semi-finished lens of each determined base curve, wherein each holographic component configuration among the M holographic component configurations is associated to a single base curve among the N base curves, such that two semi-finished ophthalmic lenses of the set have a holographic component according to a same holographic component configuration only if they have the same base curve, and each holographic component configuration associated to a base curve is configured such that the holographic component has an optical power adapted to a middle power of the range of target powers corresponding to the base curve.

9 . The method according to claim 8 , wherein the manufacturing of each semi-finished lens further includes, prior to recording the holographic component, providing an anti-reflection coating on at least one main surface of the semi-finished lens.

10 . A method of manufacturing an ophthalmic lens adapted to be worn by a wearer, wherein the ophthalmic lens has a predetermined target power according to a vision of the wearer to be corrected, the method comprising:
selecting a semi-finished lens among a set of semi-finished ophthalmic lenses, wherein the semi-finished lens is selected to have a base curve corresponding to a target power range to which belongs the predetermined target power, each range of target powers being defined by minimum and maximum target power values, and all the ranges being centered on respectively different target power values; and finishing the semi-finished lens to achieve the predetermined target power, wherein in the set of semi-finished ophthalmic lenses, each semi-finished ophthalmic lens is used in manufacturing of a finished ophthalmic lens of determined target power, each semi-finished lens has a base curve chosen among a number N of base curves, N being lower than 10, and including a holographic component recorded according to a holographic component configuration chosen among a limited number M of holographic components configurations, M being superior or equal to N, wherein each base curve among the N base curves is associated to a respective range of target powers of finished ophthalmic lenses to be manufactured from the semi-finished lenses having said base curve, each range of target powers being defined by minimum and maximum target power values, and all the ranges being centered on respectively different target power values, and each holographic component configuration among the M holographic component configurations is associated to a single base curve among the N base curves, such that two semi-finished ophthalmic lenses of the set have a holographic component according to a same holographic component configuration only when the two semi-finished ophthalmic lenses of the set have the same base curve, and each holographic component configuration associated to a base curve is configured such that the holographic component has an optical power adapted to a middle power of the range of target powers corresponding to the base curve.

11 . The method according to claim 10 , wherein the semi-finished lens has a front and a back surface, and a holographic component is provided on the fron

Assignees

• Essilor Int

Inventors

• Bouchier Aude
• Archambeau Samuel
• Scherer Karin

Classifications

• G02C7/14

  Mirrors; Prisms · CPC title

• G02C7/027

  considering wearer's parameters · CPC title

• G02B2027/0178

  Eyeglass type (eyeglass details G02C) · CPC title

• G02B2027/0174

  holographic · CPC title

• G02B2027/0109

  comprising details concerning the making of holograms · CPC title