Patent ID: 8467692

Claim:
An image forming apparatus comprising: a developing section that includes a feed member having a groove, a developer carrier developing with liquid developer fed from the feed member, and a charging member charging the liquid developer carried on the developer carrier; an image carrier that carries an image developed by the developer carrier; an optical sensor that includes a light emitting section emitting light to the image developed on the image carrier, a first light receiving section receiving light reflected from the image, and a second light receiving section disposed at a position different from that of the first light receiving section; and a control section that adjusts a developing bias applied to the developer carrier by a first power supply in response to an output signal of the first light receiving section, and controls a bias applied to the charging member by a second power supply that is different the first power source and the charging member in response to the output signal of the first light receiving section and an output signal of the second light receiving section.