Film formed on a sliding surface of a component

Patent metadata

Field	Value
Publication number	US-10442950-B2
Application number	US-201815974950-A
Country	US
Kind code	B2
Filing date	May 9, 2018
Priority date	May 18, 2017
Publication date	Oct 15, 2019
Grant date	Oct 15, 2019

Abstract

A film is formed on a sliding surface of a component. The film contains fluororesin. The film includes a surface structure in which convex portions are joined with each other like a mesh. Each of the convex portions is formed by particles of fluororesin having aggregated.

First claim

What is claimed is:

1. A film formed on a sliding surface of a component and containing fluororesin, the film comprising:
a surface structure in which convex portions are joined with each other like a mesh,
wherein each of the convex portions comprises a particle aggregation portion, which is formed by particles of fluororesin.

2. The film according to claim 1 , wherein an average particle size of the particles of fluororesin is 0.1 μm to 1.0 μm.

3. The film according to claim 2 , wherein the average particle size of the particles of fluororesin is 0.1 μm to 0.3 μm.

4. The film according to claim 3 , wherein a fluororesin content in the film is 50 percent by weight or more.

5. The film according to claim 1 , wherein a distance from a surface of the component on which the film is formed to a top of the convex portions is 1 μm to 20 μm.

6. The film according to claim 5 , wherein the distance from the surface of the component on which the film is formed to the top of the convex portions is 3 μm to 8 μm.

7. The film according to claim 1 , wherein 60 percent or more of openings of the surface structure each have a long diameter of 5 μm to 200 μm.

8. The film according to claim 1 , wherein a fluororesin content in the film is 50 percent by weight or more.

9. The film according to claim 1 , wherein a fluororesin content in the film is larger in a portion on a surface side than in a portion on a component side, in a thickness direction of the film.

10. The film according to claim 1 , wherein the film comprises a portion formed between the convex portions; and
wherein the portion contains a polyimide and/or a polyamide-imide.

11. The film according to claim 10 , wherein a polyimide content and/or a polyamide-imide content in the film is larger in a portion on a component side than in a portion on a surface side, in a thickness direction of the film.

12. The film according to claim 1 , wherein the fluororesin is tetrafluoroethylene resin.

13. The film according to claim 1 , wherein a contact angle to water of the film is equal to or larger than 120 degrees.

14. A focal-plane shutter comprising:
a base plate and a cover plate each comprising an exposure window and facing each other with a gap formed therebetween;
a light shielding blade interposed between the base plate and the cover plate; and
a blade arm fixed on the light shielding blade,
wherein the film according to claim 1 is formed on at least one portion of a sliding surface of the blade arm.

15. The focal-plate shutter according to claim 14 , wherein the film is formed on at least a surface of the base plate,
wherein the surface of the base plate faces the light shielding blade,
wherein the film is formed on at least a surface of the cover plate, and
wherein the surface of the cover plate faces the light shielding blade.

16. The focal-plate shutter according to claim 14 , wherein the light shielding blade is fixed on the blade arm by a crimping pin, and the film is formed on a surface of the crimping pin.

17. A camera comprising:
the focal-plane shutter according to claim 14 ; and
an imaging lens.

18. A method of manufacturing a film, wherein the film is the film according to claim 1 , the method comprising:
coating the component with a coating material by using a spraying method, the coating material containing a solvent, an imide-based resin, and the particles of fluororesin; and
baking the component, coated by using the spraying method, at a temperature, which is equal to or higher than an imidization-start temperature of the imide-based resin, and which is lower than a temperature of a melting point of the fluororesin.

19. The method according to claim 18 , wherein the solvent contains N-Methyl-2-pyrrolidone and water,
wherein the particles of fluororesin comprise particles of tetrafluoroethylene resin, and
wherein the imide-based resin comprises polyamic acid.

Assignees

• Canon Kk

Inventors

• Tamiya Hirotomo
• Kume Nobuyuki

Classifications

• C09D127/18 Primary

  Homopolymers or copolymers of tetrafluoroethene · CPC title

• G03B9/36

  Sliding rigid plate · CPC title

• G03B9/08

  Shutters · CPC title

• G03B9/14

  Two separate members moving in opposite directions · CPC title

• G03B9/10

  Blade or disc rotating or pivoting about axis normal to its plane · CPC title