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:
Jun. 09, 2015
Filed:
Jul. 30, 2014
Canon Kabushiki Kaisha, Tokyo, JP;
Mitsuhiro Furukawa, Kawaguchi, JP;
Tomoyuki Sakamaki, Toride, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A developing apparatus includes a developer carrying sleeve for carrying a developer to a position opposing an image bearing drum. The sleeve is provided with a plurality of groove portions extending in an axial direction of the sleeve, and a developing bias voltage applying device for applying a developing bias voltage to the sleeve. The bias voltage applying device is capable of outputting, as the bias voltage, a voltage of a waveform having a cyclic period including an AC bias portion having an AC component and a DC component superimposed thereto, and a blank portion following the AC bias portion and consisting of a DC component. A width L (m) of the groove, a peripheral speed Vs (m/s) of the sleeve, and a duration t1 (s) of the blank portion in one cyclic period of the bias voltage satisfy L/Vs<t1.