Canon Kabushiki Kaisha

Manami Tomizuka

Hiroyuki Tanaka

Terunobu Saitoh

Masaaki Nakabayashi

Masaya Hisamatsu

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.

Optical member, optical apparatus, imaging apparatus, and manufacturing method of optical member

Provided are a photocurable material composition providing a cured product, which achieves both of a heat deflection temperature of 70&#xb0; C. or more measured by Method A of JIS K 7191-1 and a Charpy impact strength of 6 kJ/mor more measured in conformity with JIS K 7111-1, after UV irradiation, and a cured product thereof. The photocurable material composition includes: 50 parts by weight to 65 parts by weight of a bifunctional urethane (meth)acrylate having (meth)acryloyl groups at both terminals thereof; 15 parts by weight to 25 parts by weight of a compound represented by the formula (4); and 10 parts by weight to 30 parts by weight of at least one of a compound represented by the formula (5) or a compound represented by the formula (6).

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Utsunomiya, Japan

Manami Tomizuka