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:
Nov. 22, 1994
Filed:
Apr. 20, 1993
Eiichi Kido, Yamato-Koriyama, JP;
Yuhi Yui, Nabari, JP;
Syunju Anzai, Nara, JP;
Syoichiro Yoshiura, Yamato-Koriyama, JP;
Shinji Imagawa, Yao, JP;
Hiroaki Yoshida, Yamato-Koriyama, JP;
Yoshikazu Kawasaki, Kagoshima, JP;
Itaru Kawabata, Kashiba, JP;
Keizo Fukunaga, Ikoma, JP;
Toyokazu Mori, Yamato-Koriyama, JP;
Masaru Tsuji, Nara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A charger charges a recording medium before irradiation of light to form an electrostatic latent image by irradiating light as an optical image onto a surface of the recording medium. The charger includes a discharging electrode having a plurality of projections for generating corona discharge to charge the recording medium surface, a conductive shield case having an opening face opposite to the recording medium and opposed to the discharging electrode, a holding member for holding the discharging electrode in the shield case in a state in which the discharging electrode is electrically insulated from the shield case, a conductive grid electrode electrically insulated and held between the discharging electrode and the recording medium, and a power supplying device for supplying a high voltage for discharge to the discharging electrode and setting a ratio of electric currents flowing through the grid electrode and the shield case such that these electric currents are approximately equal to each other. One form of the charger controllably moves the discharger electrode toward the recording medium for setting the value of the electric currents flowing through the grid electrode and the shield case until they are both equal to a predetermined reference value.