Resin product, method of making resin product, interchangeable lens, and optical device

Patent metadata

Field	Value
Publication number	US-2020031023-A1
Application number	US-201916503820-A
Country	US
Kind code	A1
Filing date	Jul 5, 2019
Priority date	Jul 30, 2018
Publication date	Jan 30, 2020
Grant date	—

Abstract

A resin product including an antireflection surface includes a plurality of first concave portions, a plurality of second concave portions, and a component surface. The first concave portions have opening widths equal to or larger than 1 μm and equal to or smaller than 300 μm. The second concave portions are formed on each of the plurality of first concave portions and have opening widths equal to or larger than 10 nm and equal to or smaller than 1 μm. The component surface is configured to surround each of the plurality of first concave portions.

First claim

What is claimed is:

1 . A resin product comprising an antireflection surface comprising:
a plurality of first concave portions having opening widths equal to or larger than 1 μm and equal to or smaller than 300 μm; a plurality of second concave portions formed on each of the plurality of first concave portions and having opening widths equal to or larger than 10 nm and equal to or smaller than 1 μm, and a component surface configured to surround each of the plurality of first concave portions.

2 . The resin product according to claim 1 , wherein a ratio of an area of the first concave portions to an area of the antireflection surface is equal to or larger than 10% and equal to or smaller than 95%.

3 . The resin product according to claim 1 , wherein a shortest distance of distances, each of which is measured between two adjacent ones of the plurality of first concave portions, is equal to or smaller than 100 μm.

4 . The resin product according to claim 1 , wherein a ratio of any one of the opening widths of the plurality of first concave portions to a corresponding one of depths of the first concave portions is equal to or larger than 0.4.

5 . The resin product according to claim 1 , wherein the component surface comprises a free surface, and
wherein the free surface is formed such that the free surface does not contact a mold used to mold the resin product.

6 . The resin product according to claim 5 , wherein the component surface has a curved convex surface.

7 . The resin product according to claim 1 , wherein the antireflection surface is made of resin material, and
wherein the resin material contains filler.

8 . The resin product according to claim 7 , wherein a rate of content of the filler to the resin material is equal to or larger than 5 mass percent and equal to or smaller than 45 mass percent.

9 . The resin product according to claim 7 , wherein a diameter of each particle of the filler is equal to or larger than 20 μm and equal to or smaller than 80 μm, and a length of each particle of the filler is equal to or larger than 70 μm and equal to or smaller than 100 μm.

10 . The resin product according to claim 1 , wherein a surface roughness of the component surface is indicated by an Spc value, and
wherein the Spc value of the component surface is equal to or larger than 1500 and equal to or smaller than 9000.

11 . A method of making a resin product comprising an antireflection surface, the method comprising:
preparing a mold, a molding surface of which comprising a plurality of first convex portions and a plurality of second convex portions formed on surfaces of the plurality of first convex portions, the plurality of first convex portions having diameters equal to or larger than 1 μm, the plurality of second convex portions having diameters equal to or larger than 10 nm and equal to or smaller than 1 μm; and forming a plurality of first concave portions on a resin material and forming a plurality of second concave portions on inner surfaces of the plurality of first concave portions by causing the resin material to contact the mold, the plurality of first concave portions having opening widths equal to or larger than 1 μm and equal to or smaller than 300 μm, the plurality of second concave portions having opening widths equal to or larger than 10 nm and equal to or smaller than 1 μm.

12 . The method according to claim 11 , wherein the forming of the plurality of first and second concave portions comprises controlling transfer pressure so that a ratio of an area of the plurality of first concave portions to an area of the antireflection surface is equal to or larger than 10% and equal to or smaller than 95%.

13 . The method according to claim 11 , wherein the forming of the plurality of first and second concave portions comprises controlling transfer pressure so that a shortest distance of distances, each of which is measured between two adjacent ones of the plurality of first concave portions, is equal to or smaller than 100 μm.

14 . The method according to claim 11 , wherein the forming of the plurality of first and second concave portions comprises controlling transfer pressure so that a ratio of any one of the opening widths of the plurality of first concave portions to a corresponding one of depths of the first concave portions is equal to or larger than 0.4.

15 . The method according to claim 11 , wherein the forming of the plurality of first and second concave portions comprises controlling transfer pressure so that space is formed between the plurality of first convex portions and the molding surface, and
wherein the space prevents the molding surface and the resin material from contacting each other.

16 . The method according to claim 11 , wherein the forming of the plurality of first and second concave portions comprises using the resin material that contains filler.

17 . The method according to claim 11 , wherein the preparing the mold comprises attaching the mold to an injection molding apparatus.

18 . The method according to claim 11 , wherein the preparing the mold comprises attaching the mold to a roll-mold molding apparatus.

19 . An interchangeable lens comprising:
a supporting member comprising the resin product according to claim 1 , and an optical element supported on an optical axis by the supporting member.

20 . An optical device comprising:
a container comprising the resin product according to claim 1 , and an optical system contained by the container.

Assignees

• Canon Kk

Inventors

• Nagoya Toshimitsu
• Kojima Makoto
• Oikawa Kei
• Enokida Yukiya
• Endo Takashi
• Morisaki Osamu

Classifications

• B29C45/26

  Moulds · CPC title

• G02B1/118 Primary

  having sub-optical wavelength surface structures designed to provide an enhanced transmittance, e.g. moth-eye structures · CPC title

• B29L2011/00

  Optical elements, e.g. lenses, prisms · CPC title

• B29C43/02

  of articles of definite length, i.e. discrete articles {(B29C35/0227 takes precedence)} · CPC title

• B29C43/021

  characterised by the shape of the surface · CPC title