Optical element, optical instrument, imaging device, and method for manufacturing an optical element

Abstract

We provide optical elements that also offer environmental durability. [Solution] An optical element comprising a base material, a resin layer provided on the surface of the base material with a diameter smaller than the diameter of the base material, an anti-reflective film layer covering at least the boundary between the base material and the resin layer, and a protective layer, wherein the anti-reflective film layer includes a porous layer containing particles of an inorganic compound, and the protective layer is provided on the boundary.

Claims

1. base material, A resin layer is provided on the surface of the substrate with a diameter smaller than the diameter of the substrate. An anti-reflective coating layer covering at least the boundary between the substrate and the resin layer, and protective layer An optical element having, The optical element is characterized in that the anti-reflective film layer includes a porous layer containing particles of an inorganic compound, and the protective layer is provided on the boundary portion.

2. The optical element according to claim 1, wherein the protective layer has a thickness of 1 μm or more and 100 μm or less.

3. The optical element according to claim 1, wherein the protective layer is made of a resin having an elastic modulus of 200 MPa or more and 4000 MPa or less.

4. The optical element according to claim 1, characterized in that the particles of the inorganic compound are silica particles.

5. The optical element according to claim 4, characterized in that the silica particles are hollow silica particles.

6. The optical element according to claim 4, characterized in that the silica particles are chain-like silica particles.

7. The optical element according to claim 1, wherein the particle size of the inorganic compound particles is 15 nm or more and 300 nm or less.

8. The anti-reflective coating layer comprises, in order from the substrate side, a first layer, a second layer, and a third layer. The optical element according to claim 1, wherein the third layer is the porous layer, and either the first layer or the second layer is an organic layer and the other is an inorganic compound layer.

9. The optical element according to claim 1, wherein the width of the laminated region R1 covering the resin layer of the protective layer is 1% or more and 15% or less of the radius of the resin layer.

10. The optical element according to claim 1, wherein the width of the laminated region R1 covering the resin layer in the protective layer is 0.05 mm or more and 3 mm or less.

11. The optical element according to claim 1, wherein the protective layer is a light-shielding film.

12. The optical element according to claim 1, wherein a buffer layer is provided between the substrate and the resin layer at the outer edge of the resin layer.

13. The optical element according to claim 12, wherein the buffer layer does not extend beyond the stacking region R2.

14. The optical element according to claim 12, wherein the thickness of the protective layer is greater than the thickness of the buffer layer.

15. The optical element according to claim 12, wherein the buffer layer is a light-shielding film.

16. The optical element according to claim 12, wherein the protective layer and the buffer layer are made of the same material.

17. The optical element according to claim 1, wherein the maximum thickness of the resin layer is five times or more than the central thickness of the resin layer.

18. An optical instrument comprising a housing and an optical system having at least one lens disposed within the housing, An optical device characterized in that at least one of the lenses is an optical element according to any one of claims 1 to 17.

19. An imaging device comprising a housing, an optical system having at least one lens disposed within the housing, and an image sensor that receives light passing through the optical system, An imaging device characterized in that at least one of the lenses is an optical element according to any one of claims 1 to 17.

20. A filling process in which a resin composition is filled between the substrate and the mold. A curing step in which the resin composition is cured to form the resin layer, A mold release step for releasing the resin layer, An anti-reflective film forming step in which an anti-reflective film is formed on the surface of the resin layer, and Light-shielding film formation step: Forming a light-shielding film that covers a portion of the anti-reflective film. A method for manufacturing an optical element according to any one of claims 1 to 17, including the method described above.

21. The method for manufacturing an optical element according to claim 20, characterized in that a light-shielding film is formed covering the side surface of the substrate and a part of one surface of the substrate.

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