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CN-122003323-A - Method for manufacturing optical article

CN122003323ACN 122003323 ACN122003323 ACN 122003323ACN-122003323-A

Abstract

The invention relates to a method for producing an optical article (30), comprising the steps of S1) providing at least two different components (10), each component having two end faces (11, 12), S2) assembling the at least two components such that their end faces (11, 12) form the main faces (21, 22) of the component assembly (20), and S3) machining at least one of the main faces to produce at least one optical face of the optical article.

Inventors

  • L Castro Martinez
  • J - Macha

Assignees

  • 依视路国际公司

Dates

Publication Date
20260508
Application Date
20241030
Priority Date
20231103

Claims (17)

  1. 1. A method for manufacturing an optical article (30), the method comprising the steps of: s1) providing at least two different components (10), each component having two end faces (11, 12) and at least one side face, S2) assembling the at least two components (10) through their side faces such that their end faces (11, 12) form the main faces (21, 22) of the component (10) assembly (20), and S3) machining at least one of the main faces (21, 22) to form at least one optical face (31, 32) of the optical article (30).
  2. 2. A method according to claim 1, wherein step S3) comprises machining the two main faces (21, 22) to form the two optical faces (31, 32) of the optical article (30).
  3. 3. The method according to claim 1 or 2, wherein the assembling step S2) comprises positioning the at least two components (10) relative to each other, and joining the at least two components (10).
  4. 4. A method according to claim 3, wherein the at least two components (10) are made of a material having a first refractive index and are bonded by means of glue having a second refractive index, the ratio of the second refractive index to the first refractive index being between 83% and 100%.
  5. 5. A method according to claim 3, wherein the at least two components (10) are joined by melting.
  6. 6. A method according to any one of claims 1 to 5, wherein the end faces (11, 12) of each component (10) are parallel.
  7. 7. A method according to any one of claims 1 to 6, wherein the two components (10) have different lengths (L1, L2, L3), each length being measured between end faces (11, 12) of the components (10).
  8. 8. The method according to claim 7, wherein the providing step S1) comprises a sub-step S11) of calculating the length (L1, L2, L3) of each component (10) from the desired shape of the optical face (31, 32) of the optical article (30).
  9. 9. The method according to claim 8, wherein each length (L1, L2, L3) is calculated such that at least one point of each end face (11, 12) of the component (10) is located on one of the optical faces (31, 32) of the optical article (30) or at a distance from the optical face that is less than a predetermined threshold.
  10. 10. The method according to any one of claims 1 to 9, wherein the at least two components (10) have the same cross-section in a plane orthogonal to an axis passing through both end faces (11, 12) of one of the components (10).
  11. 11. The method according to any one of claims 1 to 9, wherein the at least two components (10 c,10d,10e,10 f) have different cross sections in a plane orthogonal to an axis passing through both end faces (11, 12) of one of the components (10 c,10d,10e,10 f).
  12. 12. The method according to claim 11, wherein one component (10G) has a circular shape and at least one further component (10 h,10 j) has a ring shape.
  13. 13. The method according to any one of claims 1 to 12, wherein one component (10A) has a recess and the other component (10B) has a protrusion that engages into the recess during the assembling step S2).
  14. 14. The method according to any one of claims 1 to 13, wherein the providing step S1) comprises a sub-step S12) of manufacturing at least one component (10) by additive manufacturing or by molding or by cutting a template.
  15. 15. The method according to any one of claims 1 to 14, wherein the at least two components (10) have different refractive indices.
  16. 16. The method according to any one of claims 1 to 15, wherein the at least two components (10) perform different optical functions.
  17. 17. An optical article (30) having two optical faces (31, 32) and comprising at least two distinct and assembled components (10), each component (10) having two end faces (11, 12), the end faces (11, 12) of the component (10) forming the optical faces (31, 32).

Description

Method for manufacturing optical article Technical Field The present invention relates generally to the field of eyeglasses. More particularly, the present invention relates to a method for manufacturing an optical article, such as an ophthalmic lens, to be mounted in a spectacle frame. Background A conventional method for manufacturing an ophthalmic lens includes: providing two molded shells, at the periphery of which an annular closing member (e.g. a closure tape) is provided, which together with these shells defines a molding cavity, Molding a lens blank by filling the molding cavity with a monomer and by polymerizing the monomer into a polymer, -Machining both surfaces of the blank to obtain a lens that fulfills the optical function it is designed for. The two molded shells are used to mold several lens blanks to produce lenses having different shapes. The shape difference between the lens blank and the resulting machined lens is typically large. In practice, the blank must have a thickness large enough to be used to make lenses of various shapes. In other words, molding a lens blank requires a large amount of material. And a large amount of material must be removed during the machining step. It is not uncommon for the weight of a lens blank to be 5 times the weight of the finished lens. This problem can be avoided with smaller blanks, but this solution would require a large number of differently shaped molded shells, which in practice is not manageable. Disclosure of Invention Against this background, the present invention provides a new method for manufacturing optical articles that minimizes the amount of manufacturing material required and the amount of material to be removed during the machining step. More precisely, the invention relates to a method for manufacturing an optical article, comprising the steps of: s1) providing at least two different components, each component having two end faces and at least one side face, S2) assembling the at least two components through their side surfaces such that their end surfaces form the main face of the component assembly (i.e. the lens blank), and S3) machining at least one of the major faces to form at least one optical face of an optical article. Thus, the lens blank is not formed by molding from a single piece, but from individual pieces that are assembled edge-to-edge (with their sides in contact with each other). Thus, each component can be designed to have the smallest possible dimensions. Thus, thanks to the present invention, the amount of material required to form the lens blank is much less than the amount of material required to mold the lens blank in a single part, which is both cost-effective and environmentally friendly. Furthermore, the amount of material to be removed during the machining step is also reduced, so that this step can be performed faster and at lower cost, since fewer tools are used to damage. Other preferred features of the invention are as follows: The optical faces are the front and rear faces (opposite each other) of the optical article, The one or more sides extending between the end faces, Step S3) comprises machining the two main faces to form two optical faces of the optical article; -the assembling step S2) comprises positioning the at least two parts relative to each other, and joining the at least two parts; -the at least two components are made of a material having a first refractive index and are joined by means of glue having a second refractive index, the ratio of the second refractive index to the first refractive index being comprised between 83% and 100%; in a variant, the at least two components are joined by melting. The end faces of each component are parallel; -the two parts have different lengths, each length being measured between the end faces of the parts; -said providing step S1) comprises a sub-step S11) of calculating the length of each component from the desired shape of the optical face of the optical article; -each length is calculated such that at least one point of each end face of the component is located on one of the optical faces of the optical article, or at a distance from the optical face that is less than a predetermined threshold; -at least two parts have the same cross-section in a plane orthogonal to an axis passing through both end faces of one of said parts; All parts have the same cross section; -the at least two parts have different cross-sections in a plane orthogonal to an axis passing through both end faces of one of the parts; One part has a circular shape and at least one other part has an annular shape; -one part has a recess and the other part has a protrusion which engages into said recess during said assembling step S2); -said providing step S1) comprises a substep S12) of manufacturing at least one component by additive manufacturing or by molding or by cutting a template; -the at least two components have different refractive indices; -the optical article is an opht