Patent ID: 9170550
Filing Date: 2015-10-27
Classification: G03G

Abstract:
1. An image forming apparatus, comprising: a fixing part configured to heat fix an unfixed toner image formed on a recording material to the recording material, the fixing part comprising a heater that generates heat by power supplied from an AC power supply; a temperature sensing element configured to sense a temperature of the fixing part; and a power control part configured to control the power supplied from the AC power supply to the heater, the power control part selecting a duty ratio from a plurality of duty ratios set in each of a plurality of tables in accordance with the temperature sensed by the temperature sensing element per one control cycle defined by a predetermined even number of half-cycles of an AC wave, wherein a wave form of at least one duty ratio in the plurality of duty ratios in each of the plurality of tables is composed of a combination of a phase control pattern and a wave number control pattern, which are included per the one control cycle, and wherein ratios of the phase control wave forms with respect to the wave number control wave forms are different among the plurality of the tables, and wherein the power control part selects one table per the one control cycle, among the plurality of tables.