Patent ID: 8284420
Filing Date: 2012-10-09
Classification: G03G

Abstract:
1. A heating device comprising: plural heat sources configured to heat one or more members; a power supplying device configured to supply a power to each of the plural heat sources; and a controller configured to determine a fixed first priority order for the plural heat sources while determining a second priority order for the plural heat sources in every control cycle based on the fixed first priority order and to control the power supplying device to supply a power to one of the plural heat sources according to the second priority order, wherein: when the controller judges to activate only one of the plural heat sources in a control cycle, the controller allows the power supplying device to supply a power to one of the plural heat sources in the control cycle, when the controller judges to activate two or more of the plural heat sources in a control cycle, the controller allows the power supplying device to supply a power to one of the plural heat sources, which has a highest rank in the second priority order among the two or more of the plural heat sources, in the control cycle, and the controller changes the second priority order by according a lowest rank to one of the heat sources activated in a last control cycle while maintaining rank relationship among the others of the plural heat sources in the second priority order in the last control cycle.