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

Patent metadata

Field	Value
Publication number	US-11485052-B2
Application number	US-201916503820-A
Country	US
Kind code	B2
Filing date	Jul 5, 2019
Priority date	Jul 30, 2018
Publication date	Nov 1, 2022
Grant date	Nov 1, 2022

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 of 1 μm to 300 μm;
a plurality of second concave portions formed on each of the plurality of first concave portions and having opening widths of 10 nm to 1 μm, and
a component surface configured to surround each of the plurality of first concave portions,
wherein the component surface includes a saddle-shaped convex portion on which no concave portions having opening widths of 10 nm to 1 μm are formed.

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 10% to 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 a resin material, and
wherein the resin material contains a filler.

8. The resin product according to claim 7 , wherein a rate of content of the filler to the resin material is 5 mass percent to 45 mass percent.

9. The resin product according to claim 7 , wherein a diameter of each particle of the filler is 20 μm to 80 μm, and a length of each particle of the filler is 70 μm to 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 1500 to 9000.

11. 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.

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

13. The resin product according to claim 1 , wherein a contour of the plurality of first concave portions has a shape formed by a first concave curve, a second concave curve, a first convex curve, and a second convex curve,
wherein a curvature of the first concave curve is different from a curvature of the second concave curve, and a curvature of the first convex curve is different from a curvature of the second convex curve.

14. A method of making a resin product comprising an antireflection surface, the method comprising:
preparing a mold having a molding surface, which comprises 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 of 10 nm to 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 of the resin material having opening widths of 1 μm to 300 μm, and the plurality of second concave portions of the resin material having opening widths of 10 nm to 1 μm,
wherein a component surface surrounds each of the plurality of first concave portions of the resin material, the component surface including a saddle-shaped convex portion on which no concave portions having opening widths of 10 nm to 1 μm are formed.

15. The method according to claim 14 , 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 10% to 95%.

16. The method according to claim 14 , 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.

17. The method according to claim 14 , 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.

18. The method according to claim 14 , wherein the forming of the plurality of first and second concave portions comprises using the resin material that contains a filler.

19. The method according to claim 14 , wherein the preparing the mold comprises attaching the mold to an injection molding apparatus.

20. The method according to claim 14 , wherein the preparing the mold comprises attaching the mold to a roll-mold molding apparatus.

Assignees

• Canon Kk

Inventors

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

Classifications

• B29C43/36 Primary

  Moulds for making articles of definite length, i.e. discrete articles · CPC title

• B29D11/0049

  Double sided moulds · CPC title

• G02B7/14

  adapted to interchange lenses {(G02B7/027 takes precedence)} · CPC title

• B29C43/02

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

• G02B1/118 Primary

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