Fixing device and image forming apparatus incorporating same

Patent metadata

Field	Value
Publication number	US-10795293-B2
Application number	US-201916690236-A
Country	US
Kind code	B2
Filing date	Nov 21, 2019
Priority date	Nov 21, 2018
Publication date	Oct 6, 2020
Grant date	Oct 6, 2020

Abstract

A fixing device includes a fixing rotator, a heat source, a pressing member, a nip formation member, a reflector, and a support. The heat source is configured to heat the fixing rotator. The pressing member is configured to form a nip with the fixing rotator. The nip formation member is disposed inside a loop of the fixing rotator and opposed to the pressing member to form the nip between the fixing rotator and the pressing member. The reflector is configured to reflect heat from the heat source. The support is configured to secure the reflector. The support is in contact with the reflector at at least one end portion in a longitudinal direction of the support.

First claim

The invention claimed is:

1. A fixing device comprising:
a fixing rotator;
a heat source configured to heat the fixing rotator;
a pressing member configured to form a nip with the fixing rotator; and
a nip formation member, disposed inside a loop of the fixing rotator and opposed to the pressing member, to form the nip between the fixing rotator and the pressing member;
a reflector configured to reflect heat from the heat source; and
a support, in a U-shape, configured to secure the reflector,
an arm of the U-shape of the support being in contact with the reflector at one end portion in a longitudinal direction of the support.

2. The fixing device according to claim 1 ,
wherein the support is in secured to the reflector in both end portions in the longitudinal direction of the support.

3. The fixing device according to claim 2 ,
wherein an area of a contact region of the support with the reflector is relatively larger in the at least one end portion of the support in the longitudinal direction than in a central portion of the support in the longitudinal direction.

4. An image forming apparatus comprising the fixing device according to claim 2 .

5. The fixing device according to claim 1 , further comprising a heat insulator interposed between the support and the reflector in at least a part of a central portion in the longitudinal direction of the support.

6. The fixing device according to claim 1 ,
wherein an area of a contact region of the support with the reflector is relatively larger in the at least one end portion of the support in the longitudinal direction than in a central portion of the support in the longitudinal direction.

7. The fixing device according to claim 1 ,
wherein the reflector is secured to the support by screwing.

8. The fixing device according to claim 7 ,
wherein the reflector is screwed to the support at a portion determined according to an area of a contact region of the support with the reflector.

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

10. The fixing device according to claim 1 , further comprising a heat insulator interposed between the support and the reflector in at least a part of a central portion in the longitudinal direction of the support.

11. The fixing device according to claim 1 ,
wherein the nip formation member is made of a resin.

12. The fixing device according to claim 11 ,
wherein the reflector is screwed to the support at a portion determined according to an area of a contact region of the support with the reflector.

13. A fixing device comprising:
a fixing rotator;
a heat source configured to heat the fixing rotator;
a pressing member configured to form a nip with the fixing rotator; and
a nip formation member, disposed inside a loop of the fixing rotator and opposed to the pressing member, to form the nip between the fixing rotator and the pressing member;
a reflector configured to reflect heat from the heat source; and
a support configured to secure the reflector,
the support being secured to the reflector at one end portion in a longitudinal direction of the support, and remaining unsecured in a central portion in a longitudinal direction of the support.

14. The fixing device according to claim 13 ,
wherein the support is in secured to the reflector in both end portions in the longitudinal direction of the support.

15. The fixing device according to claim 13 , further comprising:
a heat insulator interposed between the support and the reflector in at least a part of a central portion in the longitudinal direction of the support.

16. The fixing device according to claim 13 ,
wherein an area of a contact region of the support with the reflector is relatively larger in the at least one end portion of the support in the longitudinal direction than in a central portion of the support in the longitudinal direction.

17. An image forming apparatus comprising the fixing device according to claim 13 .

18. The fixing device according to claim 13 ,
wherein the reflector is screwed to the support at a portion determined according to an area of a contact region of the support with the reflector.

19. The fixing device according to claim 13 ,
wherein the support is in a U-shape, configured to secure the reflector, and
an arm of the U-shape of the support being in contact with the reflector at one end portion in a longitudinal direction of the support.

20. The fixing device according to claim 19 ,
wherein the nip formation member is made of a resin.

Assignees

• Utsunomiya Kohichi
• Ikebuchi Yutaka
• Ricoh Co Ltd

Inventors

• Utsunomiya Kohichi
• Ikebuchi Yutaka

Classifications

• G03G15/2053 Primary

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