# US 10,120,107 B2 · Optical element and method for producing optical element

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- Number: US 10,120,107 B2
- Document ID: US10120107B2
- Status: Granted
- Kind: B2
- Application number: 14/947,910
- Filed: 2015-11-20
- Published: 2016-06-02
- Granted: 2018-11-06
- Earliest claimed: 2014-11-27
- Assignees: Canon Kabushiki Kaisha
- Applicants: Canon Kabushiki Kaisha
- Inventors: Keiko Abe; Tomonari Nakayama
- Web page: https://patentgrep.com/patent/US10120107B2

## CPC

- G02B 1/14: Protective coatings, e.g. hard coatings
- G02B 1/11: Anti-reflection coatings
- G02B 27/0018: {with means for preventing ghost images (anti-reflection coatings G02B1/11)}
- G02B 1/113: using inorganic layer materials only
- G02B 1/118: having sub-optical wavelength surface structures designed to provide an enhanced transmittance, e.g. moth-eye structures
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An optical element having a substrate and a light-shielding film on part of an outer portion of the substrate further contains a coating on the light-shielding film, the coating containing a cured mixture of a melamine or benzoguanamine resin, and a phenolic resin, in proportions by mass of 1:5 to 7:5.

## Claims

### Claim 1

An optical element comprising:
a substrate;
a light-shielding film on part of an outer portion of the substrate; and
a coating on the light-shielding film,
wherein the light-shielding film contains a coloring agent, an epoxy resin, and inorganic fine particles having a refractive index of 2.2 or more, and
wherein the coating contains a cured mixture of melamine or benzoguanamine resin, and a phenolic resin, in proportions by mass of 1:5 to 7:5, a content of the melamine or benzoguanamine resin is 20.0% by mass or more and 60.0% by mass or less when the coating is 100% by mass.

### Claim 2 (depends on 1)

The optical element according to claim 1, wherein
the coating contains a condensation product of the melamine resin and the phenolic resin.

### Claim 3 (depends on 1)

The optical element according to claim 1, wherein
the coating contains a condensation product of the benzoguanamine resin and the phenolic resin.

### Claim 4 (depends on 1)

The optical element according to claim 1, wherein
the substrate is a piece of glass.

### Claim 5 (depends on 1)

The optical element according to claim 1, wherein
the optical element is a lens or a prism.

### Claim 6 (depends on 5)

The optical element according to claim 5, wherein:
the substrate has an optically effective section and an optically ineffective section; and
there is an antireflection film on at least part of the optically effective section.

### Claim 7 (depends on 6)

The optical element according to claim 6, wherein
the antireflection film is a film formed through a liquid-phase process.

### Claim 8 (depends on 6)

The optical element according to claim 6, wherein
the antireflection film has a textured structure formed by crystals mainly of an aluminum hydroxide or a hydrate of an aluminum oxide on a surface thereof.

### Claim 9 (depends on 1)

An optical equipment comprising:
a lens including the optical element according to claim 1;
a prism including the optical element according to claim 1;
a reflector including the optical element according to claim 1; or
a diffraction grating including the optical element according to claim 1.

### Claim 10 (depends on 1)

A camera comprising a lens including the optical element according to claim 1.