Fixing device and image forming apparatus
View Patent ↗A fixing device includes: a belt; a heating element that heats the belt; and a pressure member that faces the belt and forms a nip portion between the pressure member and the belt. A dielectric relaxation rate of the belt 10 seconds after applying a corona discharge at 7000V to the belt is greater than or equal to 9.5% and less than or equal to 28.9%.
1. A fixing device comprising:
a belt including:
a substrate;
an elastic layer formed on a surface of the substrate; and
a surface layer formed on a surface of the elastic layer;
a heating element that heats the belt; and
a pressure member that faces the belt and forms a nip portion between the pressure member and the belt,
wherein a dielectric relaxation rate of the belt 10 seconds after applying a corona discharge at 7000 V to the belt is greater than or equal to 9.5% and less than or equal to 28.9%.
2. The fixing device of claim 1 , wherein the dielectric relaxation rate of the belt 10 seconds after applying a corona discharge at 7000 V to the belt is greater than or equal to 10.1% and less than or equal to 27.4%.
3. The fixing device of claim 1 , wherein the substrate includes:
an insulating layer located on an innermost side of the belt; and
a conductive layer formed on a surface of the insulating layer, and
wherein the elastic layer is formed on a surface of the conductive layer.
4. The fixing device of claim 3 , wherein the insulating layer comprises polyimide, polyphenylene sulfide, or polyether ether ketone.
5. The fixing device of claim 3 , wherein the conductive layer comprises a resin and a conductivity imparting agent dispersed in the resin.
6. The fixing device of claim 5 , wherein the conductivity imparting agent is metal or carbon material.
7. The fixing device of claim 3 , wherein the elastic layer comprises silicone rubber or fluorine resin.
8. The fixing device of claim 3 , wherein the surface layer comprises fluorine resin.
9. The fixing device of claim 1 , further comprising, inside the belt, a fixing member disposed so that the belt is sandwiched between the fixing member and the pressure member.
10. The fixing device of claim 9 , further comprising, inside the belt, a pressing member disposed adjacent to the fixing member in a moving direction of the belt so that the belt is sandwiched between the pressing member and the pressure member.
11. The fixing device of claim 1 , wherein the heating element is disposed inside the belt.
12. The fixing device of claim 1 , further comprising a temperature sensor disposed in contact with an inner surface of the belt.
13. An image forming apparatus comprising:
an image forming portion that forms a developer image on a medium; and
the fixing device of claim 1 that fixes the developer image to the medium.