# US 2019/0377104 A1 · Lens and lens manufacturing method

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- Number: US 2019/0377104 A1
- Document ID: US20190377104A1
- Status: Published application
- Kind: A1
- Application number: 16/486,172
- Filed: 2018-02-16
- Published: 2019-12-12
- Earliest claimed: 2017-03-01
- Assignees: Nidec Corporation
- Applicants: Nidec Corporation
- Inventors: Muneyuki OTANI; Takashi NAKAYAMA; Takanori KAMOTO
- Web page: https://patentgrep.com/patent/US20190377104A1

## CPC

- G02B 1/113: using inorganic layer materials only
- G02B 1/041: {Lenses}
- G02B 1/14: Protective coatings, e.g. hard coatings
- G02B 3/00: Simple or compound lenses
- G02B 2003/0093: {characterised by the shape}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A lens includes a lens body that is made of resin and that includes a convex surface, a buffer layer arranged on the convex surface, and an antireflection layer arranged on the buffer layer. The buffer layer has a thickness of about 0.7 μm or more and about 6.1 μm or less, and the antireflection layer has a thickness of about 0.07 μm or more and about 0.57 μm or less. In a more preferable lens, the buffer layer has a thickness of about 1.0 μm or more and about 5.0 μm or less, and the antireflection layer has a thickness of about 0.10 μm or more and about 0.50 μm or less.

## Claims

### Claim at position 1

1-8. (canceled)

### Claim at position 2

9: A lens comprising:
a lens body that is made of resin and that includes a convex surface;
a buffer layer arranged on the convex surface; and
an antireflection layer arranged on the buffer layer; wherein
the buffer layer has a thickness of about 0.7 μm or more and about 6.1 μm or less; and
the antireflection layer has a thickness of about 0.07 μm or more and about 0.57 μm or less.

### Claim at position 3 (depends on 9)

10: The lens according to claim 9, wherein
the buffer layer has a thickness of about 1.0 μm or more and about 5.0 μm or less; and
the antireflection layer has a thickness of about 0.10 μm or more and about 0.50 μm or less.

### Claim at position 4 (depends on 9)

11: The lens according to claim 9, wherein the buffer layer has a thickness of about 1.6 μm or more.

### Claim at position 5 (depends on 9)

12: The lens according to claim 9, wherein the buffer layer has a thickness of about 4.4 μm or less.

### Claim at position 6 (depends on 9)

13: The lens according to claim 9, wherein
the buffer layer is made of resin including inorganic particles; and
the antireflection layer is made of an inorganic oxide.

### Claim at position 7

14: A lens manufacturing method comprising:
a step a) of forming a buffer layer having a thickness of about 0.7 μm or more and about 6.1 μm or less on a convex surface of a lens body made of resin; and
a step b) of forming an antireflection layer having a thickness of about 0.07 μm or more and about 0.57 μm or less on the buffer layer.

### Claim at position 8 (depends on 14)

15: The lens manufacturing method according to claim 14, wherein in the step a), the buffer layer is formed by applying, onto the convex surface, a buffer-layer-forming material that is a liquid containing inorganic particles and resin.

### Claim at position 9 (depends on 14)

16: The lens manufacturing method according to claim 14, wherein in the step b), the antireflection layer is formed by vapor deposition.