Patent ID: 6091051
Filing Date: 2000-07-18
Classification: G03G,H01R

Abstract:
A heating device comprising:an endless rotary member having a peripheral surface to be moved rotatively;a resistance heating member arranged at the peripheral surface of said endless rotary member and generating a heat when supplied with an electric current;a current receiver member provided at said endless rotary member and electrically connected to said resistance heating member; anda current supply member being in contact with said current receiver member and to be electrically connected to a power source, whereina contact surface of said current receiver member for contact with said current supply member is formed of a material harder than a contact surface of said current supply member for contact with said current receiver member,the contact surface of said current receiver member for contact with said current supply member and the contact surface of said current supply member for contact with said current receiver member have surface roughnesses satisfying a relationship of (surface roughness of said current receiver member).ltoreq.(surface roughness of said current supply member),the surface roughness Ra of said current receiver member is in a range from 0.3 .mu.m to 5.5 .mu.m, andthe surface roughness Ra of said current supply member is equal to or smaller than 5.5 .mu.m.