# US 8,541,049 B2 · Optical member, optical system using the optical member, and method of manufacturing an optical member

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- Number: US 8,541,049 B2
- Document ID: US8541049B2
- Status: Granted
- Kind: B2
- Application number: 13/417,722
- Filed: 2012-03-12
- Published: 2012-07-05
- Granted: 2013-09-24
- Earliest claimed: 2007-02-20
- Assignees: Canon Kabushiki Kaisha
- Applicants: Tomonari Nakayama; Masayuki Yamada
- Inventors: Tomonari Nakayama; Masayuki Yamada
- Web page: https://patentgrep.com/patent/US8541049B2

## CPC

- G02B 1/118: having sub-optical wavelength surface structures designed to provide an enhanced transmittance, e.g. moth-eye structures
- C03C 1/006: {to produce glass through wet route}
- C03C 17/42: at least one coating of an organic material and at least one non-metal coating
- C09D 171/00: Coating compositions based on polyethers obtained by reactions forming an ether link in the main chain (based on polyacetals C09D159/00; based on epoxy resins C09D163/00; based on polythioether-ethers C09D181/02; based on polyethersulfones C09D181/06); Coating compositions based on derivatives of such polymers
- C09D 179/08: Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- G02B 1/02: made of crystals, e.g. rock-salt, semi-conductors (G02B1/08 takes precedence)
- G02B 1/111: using layers comprising organic materials
- C03C 2217/425: consisting of a porous layer
- C03C 2217/465: having a specific shape
- C03C 2217/73: Anti-reflective coatings with specific characteristics
- C03C 2217/77: Coatings having a rough surface
- Y10T 428/24612: Composite web or sheet
- Y10T 428/24942: including components having same physical characteristic in differing degree
- Y10T 428/265: 1 mil or less
- Y10T 428/269: including synthetic resin or polymer layer or component
- Y10T 428/31504: Composite [nonstructural laminate]
- Y10T 428/31616: Next to polyester [e.g., alkyd]
- Y10T 428/31623: Next to polyamide or polyimide
- Y10T 428/31663: As siloxane, silicone or silane
- Y10T 428/31667: Next to addition polymer from unsaturated monomers, or aldehyde or ketone condensation product
- Y10T 428/31681: Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]
- Y10T 428/31721: Of polyimide
- 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
- 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)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Provided is an optical member capable of keeping a high performance antireflection effect over a long period of time with respect to an arbitrary substrate. The optical member has plural layers on a substrate, and includes at least one metal oxide layer having a void, and at least one layer containing an organic resin as a main component formed between the substrate and the metal oxide layer. The metal oxide layer is a plate crystal layer formed of a plate crystal containing aluminum oxide as a main component and a surface of the plate crystal layer has an uneven profile. The organic resin has an aromatic ring and/or a hetero ring in at least a part thereof.

## Claims

### Claim 1

A method of manufacturing an optical member, the method comprising:
forming a layer containing an organic resin as a main component on a substrate by applying to the substrate a solution containing the organic resin, the organic resin having an aromatic ring and/or an imide ring in a main chain;
forming a layer containing aluminum oxide as a main component on the layer containing the organic resin; and
subjecting the layer containing aluminum oxide as a main component to hot water treatment to form unevenness on a surface.

### Claim 2 (depends on 1)

The method of claim 1, wherein the step of subjecting the layer containing aluminum oxide as a main component to hot water treatment comprises a step of forming a crystal containing a hydroxide of aluminum or a hydrate of aluminum oxide.

### Claim 3 (depends on 2)

The method of claim 2, wherein the crystal containing a hydroxide of aluminum or a hydrate of aluminum oxide is boehmite.

### Claim 4 (depends on 1)

The method of claim 1, wherein the hot water treatment comprises soaking in hot water at 50° C. or higher or exposure to water vapor.

### Claim 5 (depends on 1)

The method of claim 1, wherein the refractive index nb of the substrate, the refractive index ni of the layer containing an organic resin as a main component, and the refractive index ns of the layer containing aluminum oxide as a main component after the hot water treatment satisfy nb≧ni≧ns.

### Claim 6

A method of manufacturing an optical member, the method comprising:
forming a layer containing a polyimide as a main component on a substrate by applying to the substrate a solution containing the polyimide;
forming a layer containing aluminum oxide as a main component on the layer containing the polyimide; and
subjecting the layer containing aluminum oxide as a main component to hot water treatment to form unevenness on a surface.

### Claim 7 (depends on 6)

The method of claim 6, wherein the step of subjecting the layer containing aluminum oxide as a main component to hot water treatment comprises a step of forming a crystal containing a hydroxide of aluminum or a hydrate of aluminum oxide.

### Claim 8 (depends on 7)

The method of claim 7, wherein the crystal containing a hydroxide of aluminum or a hydrate of aluminum oxide is boehmite.

### Claim 9 (depends on 6)

The method of claim 6, wherein the hot water treatment comprises soaking in hot water at 50° C. or higher or exposure to water vapor.

### Claim 10 (depends on 6)

The method of claim 6, wherein the refractive index nb of the substrate, the refractive index ni of the layer containing an organic resin as a main component, and the refractive index ns of the layer containing aluminum oxide as a main component after the hot water treatment satisfy nb≧ni≧ns.