Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorSatoshi Ogawara
Life of this patent
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Abstract
A first high-voltage power supply includes a first transformer configured to generate a voltage to be supplied to a first wire of a charger, and a second high-voltage power supply includes a second transformer configured to generate a voltage to be supplied to a second wire of the charger. The first and second high-voltage power supplies respectively drive the first and second transformers in accordance with pulse signals that are supplied from a CPU and that have the same frequency and phase. The first and second high-voltage power supplies respectively supply, to the first and second wires of the charger, voltages generated by driving the first and second transformers.
Claims13
An image forming apparatus comprising:
- a photosensitive member;
- an exposure unit configured to expose the photosensitive member to form an electrostatic latent image on the photosensitive member;
- a charger, arranged upstream of a position of exposure for the photosensitive member by the exposure unit in a rotation direction of the photosensitive member, including a first discharge electrode and a second discharge electrode and configured to charge the photosensitive member to be an identical polarity, before exposure by the exposure unit, by discharge caused by voltages being supplied to the first discharge electrode and the second discharge electrode;
- a first high-voltage power supply including a first transformer that generates a voltage to be supplied to the first discharge electrode and configured to supply, to the first discharge electrode, the voltage generated by driving the first transformer in accordance with a first pulse signal;
- a second high-voltage power supply including a second transformer that generates a voltage having a polarity identical with that of the voltage generated by the first high-voltage power supply and to be supplied to the second discharge electrode, and configured to supply, to the second discharge electrode, the voltage generated by driving the second transformer in accordance with a second pulse signal having frequency and phase identical with those of the first pulse signal;
- and
- a controller configured to control the first high-voltage power supply and the second high-voltage power supply;
- wherein the second pulse signal is a signal branched from the first pulse signal.
Dependencies are inferred from the claim text.