Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorYasuo Kamei
Life of this patent
Estimating the term…
Abstract
Optical scanning devices each have a Hall device for outputting a rotation signal by detecting a rotation of a motor. An optical scanning device controller has ASICs for performing startup control of the optical scanning devices, a CPU for controlling the ASICs, and a power supply path for supplying power to the optical scanning devices. The ASICs each have a FG counter for counting a clock signal and having a counter value to be reset by a rotation signal output from the Hall device. In a case where the motor is not normally driven when the optical scanning devices are started up, the CPU notifies an abnormality of the power supply device or the power supply path, based on a counter value of the FG counter acquired from each of the ASICs.
Claims12
An image forming apparatus comprising:
- a plurality of image forming units having a photosensitive member at which an image is to be formed;
- a plurality of optical scanning devices configured to expose the photosensitive member;
- a controller configured to control the plurality of optical scanning devices;
- and
- a power supply device configured to supply power to the optical scanning device,
- wherein the optical scanning device includes a motor and an output unit, the motor rotating a rotatable polygon mirror for deflecting a light beam to allow scanning of a surface of the photosensitive member by the light beam emitted from a light source for emitting the light beam, and the output unit outputting a rotation signal by detecting a rotation of the motor,
- wherein the controller includes a startup controller, a control unit, and a power supply path, the startup controller being provided for the optical scanning device and performing startup control of the optical scanning device based on output of a drive signal for driving the motor, the control unit controlling the startup controller, and the power supply path being provided to supply the optical scanning device with power generated by the power supply device,
- wherein the startup controller includes a counter for counting a clock signal, the counter having a counter value to be reset by the rotation signal output from the output unit, and
- wherein, in a case where the motor is not normally driven when the optical scanning device is started up, the control unit notifies an abnormality of the power supply device or the power supply path, based on a counter value of the counter acquired from the startup controller.
Dependencies are inferred from the claim text.