JP2008112047A5 - - Google Patents

Claims (10)

In a heat roller used in a fixing device for fixing toner on a recording medium,
A base body having a columnar shape or a cylindrical shape, at least an outer peripheral surface of which is electrically insulating;
An electric insulating layer, a heat generating layer formed on one surface of the electric insulating layer so as to have a pattern shape composed of a plurality of lines and generating heat upon application of a voltage, and the other surface of the electric insulating layer A sheet heating element including a heat transfer layer formed in a sheet shape;
A release layer having high releasability to the toner;
A shaft portion fixedly attached on the same axis to the axial end of the base body;
A first electrode provided on the shaft,
An annular second electrode disposed on the outer peripheral side of the first electrode;
An annular body interposed between the first electrode and the second electrode and having electrical insulation;
Including
The planar heating element is interposed between the outer peripheral surface of the base body and the release layer, and the base body, the heating layer, the electrical insulating layer, the heat transfer layer, and the separation layer. The mold layers are laminated in this order outward in the radial direction ,
The heat generating layer includes at least a first region and a second region adjacent to the first region in the axial direction of the heat roller,
The first region and the second region are electrically non-contacting;
The first electrode is electrically connected to the first region of the heat generating layer;
The heat roller, wherein the second electrode is electrically connected to the second region of the heat generating layer . The heat roller according to claim 1,
The heat roller, wherein the base body is configured to have a lower thermal conductivity than the heat transfer layer. The heat roller according to claim 2,
The heat roller, wherein the base body is made of synthetic resin. The heat roller according to any one of claims 1 to 3,
The heat roller further comprising an elastic body layer interposed between the outer peripheral surface of the base body and the planar heating element. The heat roller according to any one of claims 1 to 4,
The heat roller further comprising a heat insulating layer interposed between the outer peripheral surface of the base body and the planar heating element. The heat roller according to any one of claims 1 to 5,
The sheet heating element is formed in a long and thin sheet shape, and the sheet heating element is spirally wound around the outside of the base body. The heat roller according to any one of claims 1 to 6,
The sheet heating element is formed in a sheet shape, the sheet heating element is wound around the outside of the base body, and the edges are melt-bonded to each other. A fixing device comprising: the heat roller according to any one of claims 1 to 7; and a press roller that elastically contacts the outer peripheral surface of the heat roller. 9. The fixing device according to claim 8, wherein the press roller is a sponge press roller. An image forming apparatus comprising: an image forming unit for forming an unfixed toner image on a recording medium by an electrophotographic method; and the fixing device according to claim 8 or 9.