Patent ID: 8774657
Filing Date: 2014-07-08
Classification: G03G

Abstract:
1. An image forming apparatus, comprising: a charging unit that charges an image bearing member on which a latent image is formed; a latent image forming unit that forms the latent image on the image bearing member charged by the charging unit; a developing unit that develops the latent image formed on the image bearing member to obtain a developer image; a transfer unit that transfers the developer image to a recording medium; a first supply unit that supplies a voltage to the charging unit and the transfer unit, with the first supply unit including a transformer; a second supply unit that supplies a voltage to the transfer unit, with the second supply unit including a transformer and supplying a voltage opposite in polarity to the voltage supplied from the first supply unit; a detection unit that detects a current flowing through the transfer unit; and a control unit configured to control power supply, wherein when a power is supplied from the first supply unit to the charging unit, the control unit sets a discharge start voltage in which discharging starts between the image bearing member and the charging unit is based on a current detected by the detection unit, when power is supplied from the second supply unit to the transfer unit, the control unit sets one or more adjusted voltages by calculating one or more voltages to be supplied from the transfer unit so that a current detected by the detection unit is to be a predetermined value, and the first supply unit supplies a voltage to the charging unit based on the discharge start voltage and the adjusted voltage set by the control unit.