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:
Aug. 20, 1996
Filed:
Sep. 14, 1994
Yoshiro Saito, Yokohama, JP;
Haruo Fujii, Yokohama, JP;
Hiroshi Sasame, Yokohama, JP;
Tatsuhiko Hayakawa, Tokyo, JP;
Tatsuya Kobayashi, Sohka, JP;
Tetsuya Kobayashi, Kawasaki, JP;
Naoki Enomoto, Yokohama, JP;
Akihiko Uchiyama, Yokohama, JP;
Youichirou Maebashi, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A developing apparatus includes a toner carrying member, disposed opposite an image bearing member for bearing an electrostatic image, for carrying toner to the image bearing member; an electric field forming device for forming an alternating electric field between the image bearing member and the toner carrying member, wherein the alternating electric field includes a first phase in which a constant electric field for urging the toner from said image bearing member toward said toner carrying member continues for a predetermined period, a second phase in which a constant electric field for urging the toner from said toner carrying member toward said image bearing member continues for a predetermined period, and a third phase in which the electric field gradually changes from that in the first phase to that in the second phase within a predetermined period .DELTA.T, and a controller for changing a ratio (.DELTA.T/T), where T is one period of the alternating electric field.