| 摘要 |
A heating device comprises an endless rotary member, a resistance heating member, a current receiver member provided at the endless rotary member and a current supply member being in contact with the current receiver member. In a form, the current supply member is made of a sintered material containing copper and carbon, and a content of the copper in the sintered material is in a range from 55% to 80% by weight. In another form, a contact surface of the current receiver member is formed of a material harder than the current supply member. The contact surface of the current receiver member and the contact surface of the current supply member have surface roughnesses satisfying a relationship of (surface roughness of the current receiver member)</=(surface roughness of the current supply member). The surface roughness Ra of the current receiver member is in a range from 0.3 mu m to 5.5 mu m. The surface roughness Ra of the current supply member is equal to or smaller than 5.5 mu m.
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