Image forming apparatus

U.S. Patent Number: 5394221

Abstract: An image forming apparatus includes a microcomputer. The number of image forming operation of a photosensitive drum is counted by a counter as a copy quantity, and data of the copy quantity is applied to the microcomputer. By referring to a copy quantity-voltage table, voltage setting data according to the copy quantity is applied by the microcomputer to a bias voltage source so that the bias voltage source applies a required bias voltage according to the voltage setting data to a conductive substrate of the photosensitive drum.

Inventors: Kishimoto; Yasuhiro (Gifu, JP), Hashimoto; Naoyuki (Gifu, JP), Hattori; Hitoshi (Gifu, JP)

Assignee: Sanyo Electric Co., Ltd. (Moriguchi, JP)

Application Number: 08/076,398

Issued: 1995-02-28

Expired: 2007-02-28

Classes: 399/10 ; 361/225; 399/50; 399/51

Field of search: 355/203,204,208,219,215,214,228,232,221,67 361/225

Click the image above to view patent images at uspto.gov within a frame.

Click here for the fulltext page on uspto.gov within a frame.