Fixing device capable of preventing foreign matter from contacting a heater

Patent metadata

Field	Value
Publication number	US-11262678-B2
Application number	US-202017136458-A
Country	US
Kind code	B2
Filing date	Dec 29, 2020
Priority date	Jan 22, 2020
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

A fixing device includes an endless fixing film that can revolve, a contact member that comes into contact with an inner peripheral surface of the fixing film, a pressure roller that press-contacts the fixing film from an outside of the fixing film toward the contact member to form a fixing nip area between the fixing film and the pressure roller, a heater that heats the fixing film, and a reflective member that reflects light emitted from the heater toward the fixing film. A protective member that allows irradiation of the light to the fixing film is provided between the heater and the fixing film.

First claim

What is claimed is:

1. A fixing device comprising:
an endless fixing film that revolves;
a contact member that comes into contact with an inner peripheral surface of the fixing film;
a pressure roller that press-contacts the fixing film from outside the fixing film toward the contact member to form a fixing nip area between the fixing film and the pressure roller;
a heater that heats the fixing film;
a reflective member that reflects light emitted from the heater toward the fixing film; and
a protective member that allows irradiation of the light toward the fixing film provided between the heater and the fixing film, the protective member provided closer to the fixing film than to the heater and is not in contact with both the heater and the fixing film.

2. The fixing device according to claim 1 , wherein the protective member is provided with a plurality of through holes.

3. The fixing device according to claim 2 , wherein a facing surface is formed between the plurality of through holes on a flat surface of a side of the protective member facing the fixing film.

4. The fixing device according to claim 2 , wherein an opposite surface is formed between the plurality of through holes on a protruding curved surface of a side of the protective member opposite the fixing film.

5. The fixing device according to claim 1 , wherein the protective member is formed in a mesh shape.

6. The fixing device according to claim 1 , wherein at least a surface of the protective member facing the fixing film is formed of a high emissivity material having a higher emissivity than an emissivity of the reflective member.

7. The fixing device according to claim 1 , wherein the heater is provided between the reflective member and the fixing film.

8. The fixing device according to claim 1 , wherein the heater is provided on a side of an area opposite to the fixing nip area with respect to a revolution axis of the fixing film.

9. The fixing device according to claim 1 , further comprising a holding member that holds the contact member, wherein the reflective member is supported by the holding member.

10. An image forming apparatus comprising the fixing device according to claim 1 .

11. A fixing device comprising:
an endless fixing film that revolves;
a contact member that comes into contact with an inner peripheral surface of the fixing film;
a pressure roller that press-contacts the fixing film from outside the fixing film toward the contact member to form a fixing nip area between the fixing film and the pressure roller;
a heater that heats the fixing film;
a reflective member that reflects light emitted from the heater toward the fixing film; and
a protective member that allows irradiation of the light toward the fixing film provided between the heater and the fixing film, the protective member provided to face the fixing film by half a circumference or more of the fixing film.

12. The fixing device according to claim 11 , wherein the protective member is provided with a plurality of through holes.

13. The fixing device according to claim 11 , wherein the protective member is not in contact with both the heater and the fixing film.

14. The fixing device according to claim 11 , wherein the heater is provided between the reflective member and the fixing film.

15. An image forming apparatus comprising the fixing device according to claim 11 .

16. A fixing device comprising:
an endless fixing film that revolves;
a contact member that comes into contact with an inner peripheral surface of the fixing film;
a pressure roller that press-contacts the fixing film from outside the fixing film toward the contact member to form a fixing nip area between the fixing film and the pressure roller;
a heater that heats the fixing film;
a reflective member that reflects light emitted from the heater toward the fixing film; and
a protective member that allows irradiation of the light toward the fixing film provided between the heater and the fixing film, the protective member supported by the reflective member.

17. The fixing device according to claim 16 , wherein the protective member is provided with a plurality of through holes.

18. The fixing device according to claim 16 , wherein the protective member is not in contact with both the heater and the fixing film.

19. The fixing device according to claim 16 , wherein the heater is provided between the reflective member and the fixing film.

20. An image forming apparatus comprising the fixing device according to claim 16 .

Assignees

• Sharp Kk

Inventors

• Maeda Tomohiro

Classifications

• G03G15/2053 Primary

  Structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating · CPC title

• G03G2215/2035

  the fixing nip having a stationary belt support member opposing a pressure member · CPC title