Optical element comprising cells sealed by means of a layer of adhesive material
View Patent ↗An optical element comprises a base component ( 1 ) provided with a set of cells ( 10 ) open on a face of the component and a film ( 2 ) for sealing the cells. The film is adhesively bonded to ends ( 12 ) of separation walls ( 11 ) present between the cells. The adhesive bonding is carried out by applying a pressure adjusted so that the ends of the walls penetrate into a layer of adhesive material ( 3 ) positioned between the film and the set of cells. A refractive index value of the adhesive material is adjusted with respect to a value of the same index for the material of the ends of the walls m order to obtain an optical element which exhibits a high transparency.
1. Optical element comprising:
a base component having a set of cells placed side by side parallel to a face of the component, the cells being open at said face and being separated by walls;
a film for sealing the cells arranged on the face of the base component provided with the cells; and
a layer of an adhesive material carried by a face of the sealing film which faces the cells,
wherein the ends of the walls separating the cells penetrate into the layer of adhesive material to bring about the sealing of the cells, and wherein the adhesive material comprises a mixture of a base adhesive material and of an additional substance, the refractive index value of the adhesive material being intermediate between the respective refractive index values of said base adhesive material and of said additional substance, and an amount of the additional substance in the mixture being adapted so that a material of said ends of the walls and the adhesive material have values for an optical refractive index which are substantially equal.
2. Element according to claim 1 , in which the values of the refractive index respectively for the material of the ends of the walls and for the adhesive material exhibit a difference of less than 0.02.
3. Element according to claim 2 , in which the difference between the values of the refractive index respectively for the material of the ends of the walls and for the adhesive material is less than 0.005.
4. Element according to claim 1 , in which the walls have thicknesses of between 0.10 μm and 5 μm, measured parallel to the face of the base component.
5. Element according to claim 1 , in which the ends of at least some of the walls have shapes adjusted in order to bring about mechanical anchoring of said walls in the layer of adhesive material.
6. Element according to claim 5 , in which at least some of the ends of walls have variable thicknesses, measured parallel to the face of the base component, with a maximum thickness located inside the layer of adhesive material.
7. Element according to claim 1 , in which the additional substance is colloidal.
8. Element according to claim 1 , in which the adhesive material comprises a latex, a polyurethane, a pressure-sensitive adhesive or a polymerizable glue.
9. Element according to claim 1 , in which the sealing film is based on polyethylene.
10. Element according to claim 1 , in which the cells are filled with a substance having an optical property.
11. Element according to claim 1 , forming an optical lens.
12. Element according to claim 11 , forming an ophthalmic lens.
13. Element according to claim 1 , forming a spectacle lens.
14. Process for producing an optical element comprising the following stages:
/a/ producing a base component having a set of cells placed side by side parallel to a face of said component, the cells being opened at said face and being separated by walls;
/b/ obtaining an adhesive material having a value of an optical refractive index which is substantially equal to a value of said index for a material present at ends of the walls separating the cells;
/c/ depositing a layer of said adhesive material on a face of a film for sealing the cells; and
/d/ applying the film onto the set of cells with the face of said film which carries the layer of adhesive material facing the cells and with a pressure adjusted so that the ends of the walls separating the cells penetrate into the layer of adhesive material in order to bring about the sealing of the cells wherein the adhesive material is obtained in step /b/ in the form of a mixture comprising a base adhesive material and an additional substance, an amount of the additional substance in the mixture being adjusted in order to set the refractive index value of the adhesive material with respect to the value of said index for the material of the ends of the walls.
15. Process according to claim 14 , wherein step /b/ is carried out so that the values of the refractive index respectively for the material of the ends of the walls and for the adhesive material exhibit a difference of less than 0.02.
16. Process according to claim 15 , wherein step /b/ is carried out so that the difference between the values of the refractive index respectively for the material of the ends of the walls and for the adhesive material is less than 0.005.
17. Process according to claim 14 , wherein the base component is produced in step /a/ so that the walls have thicknesses of between 0.10 μm and 5 μm measured parallel to the face of the base component.
18. Process according to claim 14 , wherein the base component is produced in step /a/ so that the ends of at least some of the walls have shapes suitable for bringing about mechanical anchoring of said walls in the layer of adhesive material on conclusion of step /d/.
19. Process according to claim 18 , wherein the base component is produced in step /a/ so that at least some of the ends of the walls have variable thicknesses, measured parallel to the face of base component, with a maximum thickness located inside the layer of adhesive material on conclusion of step /d/.
20. Process according to claim 14 , wherein the additional substance is colloidal.
21. Process according to claim 14 , wherein the adhesive material obtained in step /b/ comprises a latex, a polyurethane, a pressure-sensitive adhesive or a polymerizable glue.
22. Process according to claim 14 , wherein the sealing film used in steps /c/ and /d/ is based on polyethylene.
23. Process according to claim 14 , wherein step /d/ is carried out by introducing the base component with the sealing film into a casting unit.
24. Process according to claim 14 , wherein step /a/ additionally comprises filling the cells with a substance having an optical property.
25. Process according to claim 14 , wherein the base component produced in step /a/ comprises an optical lens.
26. Process according to claim 25 , wherein the base component produced in step /a/ comprises an ophthalmic lens.
27. Process according to claim 14 , wherein the base optical component comprises a spectacle lens.