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. 23, 2008
Filed:
Sep. 12, 2006
Kenichi Shibuya, Toride, JP;
Kenichi Shibuya, Toride, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A printerincludes a photosensitive drum, a charge rollerfor electrically charging the photosensitive drum, a developing devicefor developing an electrostatic latent image on the photosensitive druminto a toner image, a transfer rollerfor transferring the toner image onto a recording material, and a transfer residual toner charging memberfor electrically charging toner remaining on the photosensitive drum. In the printer, a DC voltage substantially identical to a potential on the photosensitive drumbefore the photosensitive drumreaches the charge rolleris applied to the charge rollertogether with application of a voltage of an identical polarity to a charge polarity of toner to the transfer residual toner charging memberduring a current measuring operation for measuring a value of AC current passing through the charge roller, in order to set a condition of a voltage to be applied to the charge rollerduring image formation, by applying an AC voltage to the charge roller