# US 12,006,439 B2 · Optical member, optical device and coating liquid

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- Number: US 12,006,439 B2
- Document ID: US12006439B2
- Status: Granted
- Kind: B2
- Application number: 16/823,824
- Filed: 2020-03-19
- Published: 2020-10-01
- Granted: 2024-06-11
- Earliest claimed: 2019-03-27
- Assignees: Canon Kabushiki Kaisha
- Applicants: Canon Kabushiki Kaisha
- Inventors: Shuhei Yamamoto; Tomonari Nakayama
- Web page: https://patentgrep.com/patent/US12006439B2

## CPC

- C09D 1/00: Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
- C09D 7/20: Diluents or solvents
- C09D 7/62: modified by treatment with other compounds
- C23C 18/1212: {Zeolites, glasses}
- C23C 18/127: {Preformed particles}
- G02B 1/118: having sub-optical wavelength surface structures designed to provide an enhanced transmittance, e.g. moth-eye structures
- C03C 17/009: {Mixtures of organic and inorganic materials, e.g. ormosils and ormocers}
- C08K 3/36: Silica
- C23C 18/1254: {Sol or sol-gel processing}
- G03B 17/14: interchangeably
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)

## Abstract

An optical member having a porous layer having both low scattering and film strength is provided. The optical member is an optical member, having a porous layer in which a plurality of silicon oxide particles are bound with an inorganic binder on a base material, and the porous layer contains a fluorine-containing organic acid having 5 or more and 11 or less fluorine atoms in one molecule.

## Claims

### Claim 1

A member, comprising a porous layer in which silicon oxide particles having a fluorine-containing organic acid on a surface thereof are bound with an inorganic binder on a base material,
wherein the fluorine-containing organic acid is at least one selected from the group consisting of heptafluorobutyric acid, nonafluorovaleric acid, and undecafluorohexanoic acid.

### Claim 2 (depends on 1)

The member according to claim 1, wherein a content of the fluorine-containing organic acid is 0.1 phr to 8 phr based on the silicon oxide particles.

### Claim 3 (depends on 1)

The member according to claim 1, wherein the inorganic binder is a silicon oxide binder.

### Claim 4 (depends on 1)

The member according to claim 1, wherein the silicon oxide particles comprise hollow silicon oxide particles or chain-like silicon oxide particles.

### Claim 5 (depends on 1)

The member according to claim 1, wherein the porous layer comprises vacant spaces among the silicon oxide particles.

### Claim 6 (depends on 1)

An optical device, comprising a case and an optical system comprising a plurality of lenses in the case,
wherein at least one of the lenses is the member according to claim 1.

### Claim 7 (depends on 6)

The optical device according to claim 6, wherein the optical device is an image capturing apparatus further comprising an image capturing element which receives light which passes the optical system.

### Claim 8 (depends on 7)

The optical device according to claim 7, wherein the image capturing apparatus is a camera.