The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 20, 2001
Filed:
Oct. 27, 1998
Shuuhei Yamamoto, Yamatokoriyama, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
An excellent image forming state is secured constantly regardless of the history of an image forming unit installed. When a new drum cartridge is installed in a copying machine during a standby pending operation of a copy switch on a control panel, CPU reads the number of rotations of a photoreceptor drum from a memory of the drum cartridge, and updates a count of a counter C with the number of rotations read. When the copy switch is operated, CPU derives a grid voltage corresponding to the count of counter C from a relationship between the number of rotations of photoreceptor drum and the grid voltage of the electrostatic charger pre-stored in ROM, executes an image forming process by setting the grid voltage derived to a high-voltage source, and adds the number of rotations of photoreceptor drum made in the current image forming process to the count of counter C.