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:
Feb. 05, 2002
Filed:
Dec. 27, 2000
Tsuneo Mizuno, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
This invention relates to a non-contact developing method for applying a driving voltage, which is an AC voltage superimposed on a DC offset voltage, to a non-contact developing roller to develop toner, and which prevents the selective developing phenomenon from occurring. The velocity ratio between the flying velocity of toner with a large particle size and the flying velocity of toner with a small particle size changes according to the driving frequency f of the AC voltage ( ) applied to the developing roller, so by setting the driving frequency f of the AC component within a range where selective developing of the toner does not occur, it is possible to effectively prevent the selective developing phenomenon from occurring.