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US 11,598,902 B2Granted
Optical member, optical apparatus, imaging apparatus, and manufacturing method of optical member
AssigneeCanon Kabushiki Kaisha
InventorsMasaaki Nakabayashi, Hiroyuki Tanaka, Masaya Hisamatsu, Manami Tomizuka
Life of this patent
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Abstract
An optical member includes a base material containing aluminum or aluminum alloy, a first layer including black porous aluminum oxide provided on the base material, and a second layer including aluminum oxide having a plurality of projection portions provided on the first layer.
Claims12
An optical member comprising:
- a base material containing aluminum or aluminum alloy;
- a first layer including black porous aluminum oxide provided on the base material;
- and
- a second layer including aluminum oxide having a plurality of projection portions provided on the first layer.
1 more element
A method for manufacturing an optical member, comprising:
- performing alumite treatment on a base material containing aluminum or aluminum alloy to form porous aluminum oxide on a surface of the base material;
- etching the porous aluminum oxide to form a projection portion containing aluminum oxide;
- and
- dyeing the base material on which the projection portion is formed black and forming a first layer including black porous aluminum oxide on the base material and a second layer including aluminum oxide having a plurality of projection portions on the first layer.
1 more element
Dependencies are inferred from the claim text.