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:
Jan. 11, 1994
Filed:
May. 12, 1992
Yoshikazu Okamoto, Kanagawa, JP;
Junichi Hama, Kanagawa, JP;
Fuji Xerox Co., Ltd., Tokyo, JP;
Abstract
A system for removing foreign matter on a photosensitive body or a developer carrying body in an image forming apparatus, in which a foreign matter removing unit 11 is arranged between a discharge lamp 7 and a transfer drum 9, the foreign matter removing unit 11 having a rotatable cylindrical electrode 11a that closely confronts a photosensitive body 2 at a predetermined distance. A high-voltage sinusoidal wave generator 12 whose frequency, dc component potential, and effective potential are variable is connected to the cylindrical electrode 11a. An ac electric field is generated between the cylindrical electrode 11a and the photosensitive body 2 by the high-voltage sinusoidal wave generator 12 and aggregates of toner particles whose size is larger than that of toner particles are resonated by the ac electric field. Application of a very weak dc electric field under this condition causes the aggregates of toner particles to move toward the cylindrical electrode 11a. As a result of the above construction, small foreign matter such as an aggregate of toner particles whose size is about 100 .mu.m or a carrier adhering to the surface of the photosensitive body, or foreign matter contained in a developer on the developer carrying body can be removed surely without disturbing normal toner particles.