Patent ID: 7212760
Filing Date: 2007-05-01
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a first device configured to set, according to a detected surface temperature of a fixing device for fixing a toner image to a record sheet, a ratio of an electrifying or non-electrifyring time per a unit time relative to a fixing heater of the fixing device, as a temperature correspondence electrifying duty ratio; a second device configured to set, according to a detected voltage of a commercial power source, a ratio of an electrifying or non-electrifying time per a unit time relative to the fixing heater, as a power correspondence electrifying duty ratio; a device configured to obtain a restricted electrifying duty ratio from the set temperature correspondence electrifying duty ratio and the set power correspondence electrifying duty ratio; and a heater control device configured to select one of the set temperature correspondence electrifying duty ratio and the obtained restricted electrifying duty ratio based upon the set temperature correspondence electrifying duty ratio and power correspondence electrifying duty ratio, and configured to perform electrifying control relative to the fixing heater using the selected electrifying duty ratio, wherein when electrifying the fixing heater immediately after the commercial power source has been turned on or immediately after the apparatus has returned to a standby state from a power saving mode, the power correspondence electrifying duty ratio is set according to a first voltage and the heater control device performs electrifying control relative to the fixing heater using the set power correspondence electrifying duty ratio.