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US 2022/0089905 A1Published application
Porous film, optical element, optical system, interchangeable lens, optical device, and manufacturing method of porous film
AssigneeNikon Corporation
InventorsRyoko SUZUKI, Kenji YONEYAMA, Masahiro OSAKA
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Abstract
A porous film is a porous film having a silica particle, wherein a refractive index is 1.1 to 1.25, and a contact angle with respect to water is equal to or more than 40°.
Claims22
A porous film having a silica particle,
- wherein a refractive index is 1.1 to 1.25, and
- a contact angle with respect to water is equal to or more than 40°.
A porous film having a silica particle,
- wherein a refractive index is 1.1 to 1.25, and
- a surface of the porous film has a trimethylsilyl group.
A porous film having a silica particle,
- wherein a refractive index is 1.1 to 1.25, and
- a surface of the porous film is treated with a silane coupling agent.
A porous film-manufacturing method, comprising:
- a step of mixing a solvent that includes a tertiary amine, water, and a methoxypropanol (PGME) with a silicon compound and preparing a mixed solution;
- a step of agitating the mixed solution;
- a step of applying the mixed solution after agitation on a substrate and forming a coating film;
- and
- a step of heating the coating film and forming a porous film.
2 more elements
Dependencies are inferred from the claim text.