Patent ID: 8654361
Filing Date: 2014-02-18
Classification: B41J

Abstract:
1. A detection device comprising: a light-emitting device that emits a detection beam; a photodetection device that receives the detection beam; a control unit that outputs a control signal controlling power supply to the light-emitting device; and a holding unit configured to be set and disabled by the control unit and that receives the control signal outputted by the control unit; wherein the control unit outputs the control signal at a specific interval, supplies and interrupts the supply of power to the light-emitting device, can switch between a normal mode and a sleep mode in which at least some function is disabled, and synchronizes the timing of transitions between the normal mode and the sleep mode with the timing of transitions between supplying and not supplying power to the light-emitting device; wherein, once the control unit sets the holding unit, the holding unit outputs the control signal to drive the light-emitting device even when the control unit enters the sleep mode; wherein, once the control unit disables the holding unit, the holding unit holds the control signal; and wherein the control unit outputs the control signal that interrupts the power supply if power was supplied to the light-emitting device, and supplies power if power was not supplied to the light-emitting device, before changing from the normal mode to the sleep mode.