US 7,539,886 B2
Image processing apparatus, power saving control method, and program and storage medium thereof
Daisuke Suga, Kawasaki (Japan); Shunichi Fujise, Abiko (Japan); Takehiro Yoshida, Tokyo (Japan); Junji Iguchi, Yokohama (Japan); and Hideya Tabeta, Kawasaki (Japan)
Assigned to Canon Kabushiki Kaisha, Tokyo (Japan)
Appl. No. 10/592,698
PCT Filed Mar. 25, 2005, PCT No. PCT/JP2005/006445
§ 371(c)(1), (2), (4) Date Sep. 13, 2006,
PCT Pub. No. WO2005/094055, PCT Pub. Date Oct. 06, 2005.
Claims priority of application No. 2004-092572 (JP), filed on Mar. 26, 2004.
Prior Publication US 2008/0229132 A1, Sep. 18, 2008
Int. Cl. G06F 1/32 (2006.01)
U.S. Cl. 713—324  [713/300; 713/340] 13 Claims
OG exemplary drawing
 
5. A method of controlling an image processing apparatus, comprising:
a main power supply on/off control step of turning on or off a main power supply;
a starting factor monitor step of detecting 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 step of detecting USB bus power in a USB I/F which can receive power supply;
a power saving standby mode voltage control step of selecting the voltage supplied to a starting factor monitor unit and the voltage supplied to a unit operated during the power saving standby mode; and
a shift step of causing a 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 a 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 the 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, the shift step 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.