Patent ID: 7539886
Filing Date: 2009-05-26
Classification: B41J,G06F,H04N,Y02D

Abstract:
1. An image processing apparatus comprising: a main power supply on/off control unit which turns on or off a main power supply; a starting factor monitor unit which detects a return factor from a power saving standby state to a normal operation state during a power saving standby mode; a USB bus power detecting unit which detects USB bus power in a USB I/F which can receive power supply; a power saving standby mode voltage control unit which selects the starting factor monitor unit or a unit operated during the power saving standby mode as a voltage supplying object; and shift means for causing the power saving standby mode voltage control unit to control supply voltage to the main power supply on/off control unit and supply voltage to a voltage supply portion in the starting factor monitor unit according to a signal from the USB bus power detecting unit, in accordance with a signal from the USB bus power detecting unit, so that (1) the starting factor monitor unit and the power saving standby mode voltage control unit are driven with the USB bus power when the USB bus power can be supplied during a shift to the power saving standby mode and (2) the starting factor monitor unit and the power saving standby mode voltage control unit are driven by voltage from the main power supply when the USB bus power cannot be supplied during the shift to the power saving standby mode, the shift means making the shift to the normal operation state in which the image processing apparatus is driven by the voltage from the main power supply when the starting factor monitor unit detects the return factor from the power saving standby state to the normal operation state during the power saving standby mode.