Transparent optical element including a cell assembly
View Patent ↗The invention relates to a transparent optical element including an assembly of cells having variable respective depths as measured in a direction perpendicular to a surface of the element having said cells. The cells can be filled with a gas or with mixtures of at least two components having different light refraction index values. The variation of the cell depth increases the variation of an equivalent value of the light refraction index associated with each cell, and reduces the roughness of a lens equivalent to the optical element.
1. A transparent optical element allowing a clear vision of an object or a scene through said optical element and comprising:
a substrate with a reference face;
a network of walls carried by the reference face and forming a set of cells that are separated and juxtaposed parallel to said reference face, the walls having respective tops situated at a constant height measured from the reference face, and
a film for sealing the cells, arranged on the tops of the walls parallel to the reference face,
each cell being limited laterally by faces of the walls, and limited between the sealing film and a cell bottom along a direction perpendicular to the reference face, with an inner depth of the cell measured between the tops of the walls and the bottom of said cell, along said perpendicular direction, and containing a transparent medium, wherein:
at least some of the cells have different depths, with an additional portion of a transparent solid material arranged between the bottom of each of said cells and the reference face,
the material of the additional portions and the medium is contained in at least one of the cells having different respective light refraction index values, and
the inner depths of the cells having a distribution that provides a macroscopic dioptric effect to the transparent optical element.
2. A transparent optical element according to claim 1 , in which the walls are at least partially constituted by a material identical to the material of the additional portions.
3. A transparent optical element according to claim 1 , in which the material of the additional portions is a lithographic resin.
4. A transparent optical element according to claim 1 , in which several cells having different respective depths each contain an identical medium.
5. A transparent optical element according to claim 4 , in which said identical medium is air, an inert gas, or a vacuum.
6. A transparent optical element according to claim 1 , in which the media contained in several cells having different respective depths, comprise respectively mixtures of at least two constituents for filling the cells, with proportions that can vary between at least some of said cells.
7. A transparent optical element according to claim 6 , in which the constituents for filling the cells have different respective light refraction index values.
8. A transparent optical element according to claim 1 , in which the depth of the cells varies between 5 μm and 30 μm.
9. A transparent optical element according to claim 1 , in which centres of neighbouring cells are separated, parallel to the reference face, by a distance comprised between 10 μm and 200 μm.
10. A transparent optical element according to claim 1 , in which the depths of the cells and the media contained in said cells have variations suitable for conferring to said element an optical power similar to an optical lens effect.
11. A transparent optical element according to claim 1 , in which the substrate comprises a base film.
12. A transparent optical component comprising a base optical component and a transparent optical element according to claim 11 , said element being fixed on a face of said base component.
13. A transparent optical component according to claim 12 , forming an ophthalmic spectacle eyeglass capable of producing a vision correction for a wearer of said eyeglass.
14. A transparent optical component according to claim 13 , in which the base optical component is itself an ophthalmic eyeglass.
15. A transparent optical element according to claim 1 , in which the depth of the cells varies between 15 μm and 25 μm.
16. A transparent optical element according to claim 1 , in which centres of neighbouring cells are separated, parallel to the reference face, by a distance comprised between 40 μm and 75 μm.