Method for manufacturing an ophthalmic lens
View Patent ↗Disclosed is a method for manufacturing an ophthalmic lens including a substrate and a functional film securely fastened to a curved face of the substrate. This method includes a method for gluing the initially flat functional film to the curved face. To ensure that the functional film when securely fastened to the curved face filters a preset band of wavelengths centered on a wavelength denoted λp, multiple functional films are preselected; two knowledge bases are established experimentally; a film is selected, using the two knowledge bases, from the plurality of preselected films, the wavelength λi′ on which is centered the band of wavelengths that this film filters for a certain degree of deformation being equal to λp when the degree of deformation is that given for the curvature in question; and the gluing method is implemented in order to securely fasten the selected film to the curved face.
1. Method for manufacturing an ophthalmic lens comprising a substrate ( 31 ) and a functional film securely fastened to a curved face (S 1 ) of said substrate, said manufacturing method comprising a method for gluing said functional film, which is initially flat, to said curved face (S 1 ); wherein, in order to ensure that said functional film ( 32 ; 53 ) when securely fastened to said curved face (S 1 ) is configured to filter a preset band of wavelengths centred on a wavelength denoted λp, said curved face (S 1 ) having a curvature denoted CS selected from a preset set of curvatures (CS 1 , CS 2 , CS 3 , CS 4 ), the following steps are carried out:
i) a step of preselecting a plurality of functional films (FILM 1 , FILM 2 ) that are each initially flat and that are each initially configured to filter a band of wavelengths centred on a wavelength, denoted λi, specific to each preselected film;
ii) a step of establishing experimentally a first knowledge base ( 70 ) giving, for each curvature (CS 1 , CS 2 , CS 3 , CS 4 ) of said set, the degree of deformation (T 11 -T 24 ) of each film preselected in step i) once said gluing method has been implemented;
iii) a step of establishing experimentally a second knowledge base ( 71 ) giving, in a preset range of degrees of deformation, for each film (FILM 1 , FILM 2 ) preselected in step i), the wavelength, denoted λi′, on which is centred the band of wavelengths that said each film filters depending on its degree of deformation;
iv) a step of selecting, using the first knowledge base ( 70 ) and the second knowledge base ( 71 ), from the plurality of films preselected in step i), a film the wavelength λi′ of which is equal to λp for the degree of deformation given for the curvature CS; and
v) a step of implementing said gluing method in order to securely fasten the film selected in step iv) to said curved face (S 1 ).
2. Method as claimed in claim 1 , wherein said functional film ( 32 ; 53 ) is an interferential and organic filtering film.
3. Method as claimed in claim 2 , wherein said functional film ( 32 ) has a three-dimensional order, with an organic layer ( 51 ; 52 ).
4. Method as claimed in claim 2 , wherein said functional film ( 53 ) has a one-dimensional order.
5. Method as claimed in claim 1 , wherein the band of wavelengths centred on λp is comprised between 400 nm and 460 nm.
6. Method as claimed in claim 1 , wherein at least 20% of the light in the band of wavelengths centred on λp is filtered.
7. Method as claimed in claim 1 , wherein the gluing method comprises steps of:
i) preforming said functional film ( 32 ; 53 ) to give it a curvature;
ii) bringing the centre of the convex face of said functional film ( 32 ; 53 ) into contact with the centre of the curved face (S 1 ) of said substrate ( 31 ); and
iii) then applying said functional film ( 32 ; 53 ) in order to diffuse radially from the centre of the film ( 32 ; 53 ) as far as its periphery the conformal contact between said film ( 32 ; 53 ) and said substrate ( 31 ).
8. Method as claimed in claim 7 , wherein said steps i), ii) and iii) are implemented with said functional film ( 32 ; 53 ), which forms part of a stratified structure ( 33 ) comprising an auxiliary membrane ( 34 ) and a binding layer ( 35 ) between said functional film ( 32 ; 53 ) and said auxiliary membrane ( 34 ), only said auxiliary membrane being immobilized peripherally.
9. Method as claimed in claim 1 , wherein each said degree of deformation (T 11 -T 34 ) of a given film (FILM 1 , FILM 2 ) is the maximum degree of major deformation ( 39 , 41 , 56 ) experienced by the film ( 32 ; 53 ) on a surface (S 0 ).
10. Method as claimed in claim 1 , wherein said preset range of degrees of deformation of the second knowledge base ( 71 ) comprises a range extending from 0 to 5%.
11. Method as claimed in claim 2 , wherein the band of wavelengths centred on λp is comprised between 400 nm and 460 nm.
12. Method as claimed in claim 3 , wherein the band of wavelengths centred on λp is comprised between 400 nm and 460 nm.
13. Method as claimed in claim 4 , wherein the band of wavelengths centred on λp is comprised between 400 nm and 460 nm.
14. Method as claimed in claim 2 , wherein at least 20% of the light in the band of wavelengths centred on λp is filtered.
15. Method as claimed in claim 3 , wherein at least 20% of the light in the band of wavelengths centred on λp is filtered.
16. Method as claimed in claim 4 , wherein at least 20% of the light in the band of wavelengths centred on λp is filtered.
17. Method as claimed in claim 5 , wherein at least 20% of the light in the band of wavelengths centred on λp is filtered.
18. Method as claimed in claim 2 , wherein the gluing method comprises steps of:
i) preforming said functional film ( 32 ; 53 ) to give it a curvature;
ii) bringing the centre of the convex face of said functional film ( 32 ; 53 ) into contact with the centre of the curved face (S 1 ) of said substrate ( 31 ); and
iii) then applying said functional film ( 32 ; 53 ) in order to diffuse radially from the centre of the film ( 32 ; 53 ) as far as its periphery the conformal contact between said film ( 32 ; 53 ) and said substrate ( 31 ).
19. Method as claimed in claim 3 , wherein the gluing method comprises steps of:
i) preforming said functional film ( 32 ; 53 ) to give it a curvature;
ii) bringing the centre of the convex face of said functional film ( 32 ; 53 ) into contact with the centre of the curved face (S 1 ) of said substrate ( 31 ); and
iii) then applying said functional film ( 32 ; 53 ) in order to diffuse radially from the centre of the film ( 32 ; 53 ) as far as its periphery the conformal contact between said film ( 32 ; 53 ) and said substrate ( 31 ).
20. Method as claimed in claim 4 , wherein the gluing method comprises steps of:
i) preforming said functional film ( 32 ; 53 ) to give it a curvature;
ii) bringing the centre of the convex face of said functional film ( 32 ; 53 ) into contact with the centre of the curved face (S 1 ) of said substrate ( 31 ); and
iii) then applying said functional film ( 32 ; 53 ) in order to diffuse radially from the centre of the film ( 32 ; 53 ) as far as its periphery the conformal contact between said film ( 32 ; 53 ) and said substrate ( 31 ).