Patent ID: 7346306
Filing Date: 2008-03-18
Classification: G03G

Abstract:
1. A fixing device built in an electrophotographic image forming apparatus, comprising: a power supplying unit for supplying power to the fixing device: a control variable determination unit for determining control variables corresponding to at least one operating state of fixing device, wherein the control variables include a plurality of reference temperatures for each of the at least one operating states and used for comparison to the temperature of the fixing device and a plurality of corresponding reference times for each of the at least one operating states; a temperature detection unit for detecting the temperature of the fixing device; and a temperature control unit for controlling the temperature of the fixing device by using the control variables as input for reaching a target temperature corresponding to the at least one operating state of the fixing device, wherein the temperature control unit comprises a duty ratio adjustment unit for adjusting a duty ratio of the supplied power based on the determined control variables.