Optical member and method of manufacturing optical member
To provide an optical member, formed without generating cracks in a hard coat layer of desired film thickness, and a method of manufacturing an optical member that permits the manufacturing of the above optical member. The optical member of the present invention is characterized by comprising a lens substrate having a curved surface, a porous intermediate layer formed so as to cover an edge portion of the lens substrate in a planar view along an optical axis of the optical member, and a hard coat layer formed so as to cover the lens substrate and the intermediate layer in the planar view; as well as characterized in that the hard coat layer comprises a thick film portion, formed on the edge portion of the hard coat layer and thicker than a center portion of the hard coat layer in the planar view, and when a maximum film thickness of the intermediate layer is denoted as A (μm) and a maximum film thickness of the thick film portion is denoted as B (μm), a relation of A/B being equal to or greater than 3% but equal to or less than 20% is satisfied.
1. An optical member, characterized by comprising:
a lens substrate having a curved surface,
a porous intermediate layer formed in an annular shape, and formed continuously or with intermittent gap(s), so as to cover an edge portion of the lens substrate in a planar view along an optical axis of the optical member, and
a hard coat layer formed so as to cover the lens substrate and the intermediate layer in the planar view; as well as characterized in that
the hard coat layer comprises a thick film portion, formed on the edge portion of the hard coat layer and thicker than a center portion of the hard coat layer in the planar view, and
when a maximum film thickness of the intermediate layer is denoted as A (μm) and a maximum film thickness of the thick film portion is denoted as B (μm), a relation of A/B being equal to or greater than 3% but equal to or less than 20% is satisfied.
2. The optical member according to claim 1 , wherein the intermediate layer is formed continuously so as to cover the entire edge portion of the lens substrate.
3. The optical member according to claim 1 , wherein a width of the intermediate layer is equal to or greater than 0.1 mm but equal to or less than 15 mm.
4. The optical member according to claim 1 , wherein the maximum thickness of the intermediate layer is equal to or greater than 0.1 μm but equal to or less than 10.0 μm.
5. The optical member according to claim 1 , wherein a film thickness in the center portion of the hard coat layer is equal to or greater than 1.5 μm but equal to or less than 50.0 μm.
6. The optical member according to claim 1 , wherein the intermediate layer comprises granules formed of resin material.
7. The optical member according to claim 1 , wherein the lens substrate has a curved convex surface and a curved concave surface, and the intermediate layer and the hard coat layer are provided on the curved convex surface.
8. The optical member according to claim 1 , wherein the intermediate layer is formed with intermittent gaps so as to cover less than the entire edge portion of the lens substrate.
9. A method of manufacturing an optical member, characterized by comprising:
forming a porous intermediate layer in an annular shape, continuously or with intermittent gap(s), such that an edge portion of a lens substrate having a curved surface is covered in a planar view along an optical axis of the optical member; and
forming a hard coat layer having a thick film portion, the thick film portion being formed on the edge portion and thicker than a center portion, such that the lens substrate and the intermediate layer are covered in the planar view; as well as characterized in that
the hard coat layer is formed so as to satisfy a relation of A/B being equal to or greater than 3% but equal to or less than 20% when a maximum thickness of the intermediate layer is denoted as A (μm) and a maximum thickness of the thick film portion is denoted as B (μm).
10. The method of manufacturing and optical member according to claim 9 , wherein the intermediate layer is formed continuously so as to cover the entire edge portion of the lens substrate.
11. The method of manufacturing and optical member according to claim 9 , wherein the intermediate layer is formed with intermittent gaps so as to cover less than the entire edge portion of the lens substrate.