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:
Oct. 05, 2010
Filed:
Dec. 08, 2006
Yuuji Sawai, Yokohama, JP;
Yuuji Sawai, Yokohama, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image forming apparatus includes an image bearing member, supporting rollers, a belt-like-shaped medium, a primary transfer member, secondary transfer rollers, and a grounded conductive roller. The image bearing member forms a toner image at a predetermined process speed. The belt-shaped medium has a charge voltage. The primary transfer member sequentially transfers the toner image onto the belt-like-shaped medium and the secondary transfer member transfers the toner image onto a recording sheet. The conductive roller is arranged in contact with the belt-shaped medium for a predetermined wrapping length. A relationship Tb<X/Vb is satisfied, where Tb is a decay time period that the charge voltage of the belt-shaped medium decays from approximately 200 volts to 200/e volts, where e is a base of natural logarithm, X is the predetermined wrapping length of the belt-shaped medium against the conductive roller, and Vb is the predetermined process speed.