Optical lens

Patent metadata

Field	Value
Publication number	US-12416819-B2
Application number	US-202117920320-A
Country	US
Kind code	B2
Filing date	Apr 21, 2021
Priority date	Apr 21, 2020
Publication date	Sep 16, 2025
Grant date	Sep 16, 2025

Abstract

Disclosed is a method implemented by a computer for determining surfacing data to obtain a surface of a lens element, the surface of the lens element including: a refraction area having a first curvature; and multiple optical elements placed on at least part of the finished optical surface, each optical element having at least a second curvature.

First claim

The invention claimed is:

1. A method implemented by a computer to determine surfacing data to obtain a surface of a lens element, the surface of the lens element including a refraction area having a first curvature, and a plurality of optical elements disposed on at least part of the finished optical surface, each of the optical elements having at least a second curvature, the method comprising:
providing lens data indicating at least a shape of said surface of the lens element to obtain, said surface of the lens element comprising a surface of the refraction area and a surface of the optical elements disposed on the refraction area, the shape of said surface of the lens element being associated with a targeted optical function;
selecting a manufacturing method intended to be implemented to obtain said surface of the lens element, said selected manufacturing method comprising a surfacing process and introducing surface defects on said surface of the lens element that are reproducible and specific to the manufacturing method in a repeatable manner, the surface defects modificating the targeted optical function;
providing a transfer law associated with the selected manufacturing method, the transfer law corresponding to transformations to apply to the shape of the surface of the lens element to compensate the surface defects introduced by the selected manufacturing method such that the targeted optical function is obtained by the selected manufacturing method; and
determining the surfacing data to obtain the surface of the lens element associated with the targeted optical function, the determining the surfacing data being based on the lens data and the transfer law.

2. The method according to the claim 1 ,
wherein the providing the transfer law comprises providing a surfacing transfer law associated with the surfacing process, the surfacing transfer law corresponding to transformations to apply to the shape of the surface of the lens element to compensate the surfacing surface defects introduced by the surfacing process such that the targeted optical function is obtained by the selected manufacturing method, and
wherein the determining the surfacing data to obtain the surface of the lens element associated with the targeted optical function is based on the lens data and at least the surfacing transfer law.

3. The method according to the claim 1 ,
wherein the selected manufacturing method comprises a polishing process introducing polishing surface defects,
wherein the providing the transfer law comprises providing a polishing transfer law associated with the polishing process, the polishing transfer law corresponding to transformations to apply to the shape of the surface of the lens element to compensate the polishing surface defects introduced by the polishing process such that the targeted optical function is obtained by the selected manufacturing method, and
wherein the determining the surfacing data to obtain the surface of the lens element associated with the targeted optical function is based on the lens data and at least the polishing transfer law.

4. The method according to claim 3 , wherein the polishing transfer law depends on one or more of: (i) the shape of the surface of the refractive area (ii) the shape of the surface of the optical elements, (iii) the material of the lens element, and (iv) a polishing condition.

5. The method according to claim 1 , wherein the selected manufacturing method comprises a coating process introducing coating surface defects,
wherein the providing the transfer law comprises providing a coating transfer law associated with the coating process, the coating transfer law corresponding to transformations to apply to the shape of the surface of the lens element to compensate the coating surface defects introduced by the coating process such that the targeted optical function is obtained by the selected manufacturing method, and
wherein the determining the surfacing data to obtain the surface of the lens element associated with the targeted optical function is based on the lens data and at least the coating transfer law.

6. The method according to claim 1 , wherein the transformations are related to one or more of:
a local power of the lens element,
an optical function associated to one or more of: the refractive area and the optical elements,
an asphericity of one or more of the refractive area and the optical elements,
a mean power of the lens element,
one or more of a surface of the refractive area and surfaces of the optical elements, and
a transition zone between the optical elements and the refractive area.

7. The method according to claim 1 , wherein the targeted optical function is adapted to: one of: (i) at least one of slow down, retard, and prevent a progress of the eye of the person, (ii) correct an abnormal refraction of the eye of the person for at least one distance of view, and (iii) identify a lens element.

8. A method for manufacturing a lens element, the method comprising:
determining the surfacing data to obtain the lens element with the method implemented by the computer means according to claim 1 ; and
manufacturing the lens element by using the determined surfacing data with the selected manufacturing method.

9. The method according to the claim 2 ,
wherein the selected manufacturing method comprises a polishing process introducing polishing surface defects,
wherein the providing the transfer law comprises providing a polishing transfer law associated with the polishing process, the polishing transfer law corresponding to transformations to apply to the shape of the surface of the lens element to compensate the polishing surface defects introduced by the polishing process such that the targeted optical function is obtained by the selected manufacturing method, and
wherein the determining the surfacing data to obtain the surface of the lens element associated with the targeted optical function is based on the lens data and at least the polishing transfer law.

10. The method according to claim 2 ,
wherein the selected manufacturing method comprises a coating process introducing coating surface defects,
wherein the providing the transfer law comprises providing a coating transfer law associated with the coating process, the coating transfer law corresponding to transformations to apply to the shape of the surface of the lens element to compensate the coating surface defects introduced by the coating process such that the targeted optical function is obtained by the selected manufacturing method, and
wherein the determining the surfacing data to obtain the surface of the lens element associated with the targeted optical function is based on the lens data and at least the coating transfer law.

11. The method according to claim 3 ,
wherein the selected manufacturing method comprises a coating process introducing coating surface defects,
wherein the providing the transfer law comprises providing a coating transfer law associated with the coating process, the coating transfer law corresponding to transformations to apply to the shape of the surface of the lens element to compensate the coating surface defects introduced by the coating process such that the targeted optical function is obtained by the selected manufacturing method, and
wherein the determining the surfacing data to obtain the surface of the lens element associated with the targeted optical function is based on the lens data and at least the coating transfer law.

12. The method according to claim 4 ,
wherein the selected manufacturing method comprises a coating process introducing coating surface defects,
wherein the providing

Assignees

• Essilor Int

Inventors

• Gacoin Eric
• Sisavanh Khamphone
• Stephane Jean

Classifications

• G02C2202/24

  Myopia progression prevention · CPC title

• G02C7/022

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

• B29D11/0098

  Inspecting lenses · CPC title

• B29D11/00971

  using CNC machining to make mould surfaces · CPC title

• B24B13/06

  grinding of lenses, the tool or work being controlled by information-carrying means, e.g. patterns, punched tapes, magnetic tapes · CPC title