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:
Dec. 24, 2013
Filed:
Mar. 23, 2011
Kazuhisa Koizumi, Abiko, JP;
Kazuhisa Koizumi, Abiko, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image forming apparatus includes an image carrier, a developing unit that visualizes an electrostatic latent image formed on a surface of the image carrier, using a developing material, and a supply unit that supplies a periodic wave as a developing bias to the developing unit. A single period of the periodic wave is formed by a first time period in which a voltage in which a DC voltage and an AC voltage are superimposed is applied and a second time period in which only a DC voltage is applied. In addition, a count unit counts an amount of electrostatic latent images that have been formed in succession, and a control unit changes the duration of the second time period according to the amount of electrostatic latent images counted by the count unit without stopping image formation to continue the image formation.