Patent ID: 6889018
Filing Date: 2005-05-03
Classification: G03G

Abstract:
1. A fixing device comprising: a heat-producing member which is formed cylindrical or belt-like, and made of material to generate an induced current by electromagnetic induction; a press member which is located to provide a predetermined pressure to the heat-producing member, and provides a predetermined pressure to a medium passing between the heat-producing member and the press member; a first coil member which is supplied with a predetermined power to generate an induced current in the heat-producing member; a second coil member which is located at a predetermined position with respect to the first coil member and the heat-producing member, and is supplied with a predetermined power to generate an induced current in the heat-producing member; a first temperature detection mechanism which is provided close to a first position where the heat-producing member is heated by the induced current from the first coil member, and detects the temperature at the first position of the heat-producing member; a second temperature detection mechanism which is provided close to a second position where the heat-producing member is heated by the induced current from the second coil member, and detects the temperature at the second position of the heat-producing member; a temperature difference detection mechanism which detects a temperature difference between the temperature at the first position of the heat-producing member detected by the first temperature detection mechanism and the temperature at the second position of the heat-producing member detected by the second temperature detection mechanism, and outputs a temperature difference value based on the detected temperatures at the first position and second position; and a driving control mechanism which switches the timing to supply a predetermined power to the first and second coil members, when the temperature difference value outputted from the temperature difference detection mechanism becomes a predetermined value.