Heating roller and image fixing apparatus using the same

• US 7,437,114 B2
• Filed: 05/22/2006
• Issued: 10/14/2008
• Est. Priority Date: 06/27/2005
• Status: Expired due to Fees

• Current Assignee: S-Printing Solution Co., Ltd. (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kang, Dong-kyun, Kim, Hwan-guem
• Primary Examiner(s): Chen; Sophia S
• Application Number:
  US11/438,071
• Publication Number:
  US 20060291925A1
• Time in Patent Office: 876 Days
• Field of Search: 399/333, 399/330, 399/328, 219/216, 219/469, 432/59, 432/60, 492/46, 492/53
• US Class Current: 399/333
• CPC Class Codes: G03G 15/2053 Structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating
• CPC Class Codes: G03G 2215/20 Details of the fixing device or porcess
• CPC Class Codes: G03G 2215/2048 Surface layer material

Abstract

A heating roller includes an exterior aluminum pipe preferably coated with a Teflon layer. A primer layer is disposed inside the exterior aluminum pipe. An outer insulating layer is disposed inside the primer layer. A heating coil is disposed inside the outer insulating layer. An inner insulating layer is disposed inside the heating coil. An aluminum interior pipe is disposed inside the inner insulating layer, and has a predetermined expandability. The heating roller is used as an image fixing unit for fixing a developed image on a recording medium while being pressed by a pressing roller at a predetermined pressure.

Claims

1. A heating roller, comprising:

an exterior pipe;

a primer layer disposed inside the exterior pipe;

an outer insulating layer disposed inside the primer layer, the outer insulating layer being a Mica layer;

a heating coil disposed inside the outer insulating layer;

an inner insulating layer disposed inside the heating coil; and

an interior pipe disposed inside the inner insulating layer having a predetermined expandability,

wherein the primer layer has a silicon-containing group that binds with silicon (Si) resin contained in the Mica layer at a high temperature.

2. The heating roller according to claim 1, wherein

the inner insulating layer is a Mica layer.

3. The heating roller according to claim 1, wherein

the primer layer is made of an enamel material.

4. The heating roller according to claim 3, wherein

the enamel material is selected from a group consisting of polyamide, polyimide, AIW (polyamideimide), and urethane.

5. The heating roller according to claim 1, wherein

the heating coil is formed of a nickel-chrome layer.

6. The heating roller according to claim 1, wherein

the primer layer has a thickness less than or equal to approximately 50 μ

m.

7. The heating roller according to claim 1, wherein

the exterior pipe is made of aluminum.

8. The heating roller according to claim 1, wherein

the interior pipe is made of aluminum.

9. An image fixing apparatus, comprising:

a heating roller; and

a pressing roller that contacts the heating roller with a predetermined pressure, and forming a fixing nip portion therebetween;

wherein the heating roller includes

an exterior aluminum pipe coated with a polytetrafluoroethylene layer;

a primer layer disposed inside the exterior aluminum pipe;

an outer insulating layer disposed inside the primer layer, the outer insulating layer being a Mica layer;

a heating coil disposed inside the outer insulating layer;

an inner insulating layer disposed inside the heating coil; and

an aluminum interior pipe disposed inside the inner insulating layer and having predetermined expandability,

wherein the primer layer has a silicon-containing group that binds with silicon (Si) resin contained in the Mica layer at a high temperature.

10. The image fixing apparatus according to claim 9, wherein

the inner insulating layer is a Mica layer.

11. The image fixing apparatus according to claim 9, wherein

the primer layer is made of an enamel material.

12. The image fixing apparatus according to claim 11, wherein

the enamel material is selected from a group consisting of polyamide, polyimide, AIW (polyamideimide), and urethane.

13. The image fixing apparatus according to claim 9, wherein

the heating coil is formed of a nickel-chrome layer.

14. The image fixing apparatus according to claim 9, wherein

the primer layer has a thickness less than or equal to approximately 50 μ

m.

15. An image forming apparatus comprising an image fixing apparatus for fixing a developed image on a recording medium, wherein the image fixing apparatus comprises:

a heating roller; and

a pressing roller that contacts the heating roller with a predetermined pressure, and

forming a fixing nip portion therebetween;

wherein the heating roller includes

an exterior aluminum pipe coated with a polytetrafluoroethylene layer;

a primer layer disposed inside the exterior aluminum pipe;

an outer insulating layer disposed inside the primer layer, the outer insulating layer being a Mica layer;

a heating coil disposed inside the outer insulating layer;

an inner insulating layer disposed inside the heating coil; and

an aluminum interior pipe disposed inside the inner insulating layer and having predetermined expandability

wherein the primer layer has a silicon-containing group that binds with silicon (Si) resin contained in the Mica layer at a high temperature.