Patent ID: 6973284
Filing Date: 2005-12-06
Classification: G03G

Abstract:
1. An induction heating fixing apparatus comprising: a cylindrical member; an induction current generation mechanism including first and second coils for allowing the cylindrical member to be heated to generate an eddy current, wherein the first and second coils are separated into two or more elements at a cross section orthogonal to a direction along which the cylindrical member to be heated rotates, the coils having a wide gap between wire turns; a pressing member which contacts with the cylindrical member to be heated and can provide a nip having a specified width in cooperation with the cylindrical member to be heated; and a releasing mechanism which, from the cylindrical member to be heated, separates a fixing member passing through the nip between the cylindrical member to be heated and the pressing member, wherein the releasing mechanism is provided at a specified position on an outside periphery of the cylindrical member to be heated in correspondence with a position causing a wide gap between wire turns of the first and second coils in the induction current generation mechanism, wherein the releasing mechanism contacts with the cylindrical member to be heated, wherein there is the position causing the gap between wire turns of the first and second coils in the induction current generation mechanism, and that position is shifted for a specified amount downstream from the nip in a direction along which the cylindrical member to be heated moves, and wherein an upper bound of the shift amount is ⅛ of a circumference of the cylindrical member to be heated.