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:
Aug. 23, 2005
Filed:
Sep. 24, 2003
Kazuhiko Kobayashi, Tokyo, JP;
Tetsuo Yamanaka, Tokyo, JP;
Hiroyasu Shijo, Tokyo, JP;
Ricoh Company, Limited, Tokyo, JP;
Abstract
A mark pattern forming unit forms a mark pattern on a transfer belt, and a reflection type optical sensor detects the mark pattern. An interval difference acquiring unit acquires an interval difference that is a deviation of each mark from a reference position. A speed detector detects a moving speed vof the transfer belt in a period between formation of the mark pattern and the detection of the mark pattern, and a moving speed vduring image formation. A speed difference calculating unit calculates a speed difference Δv=v−v, and a control unit controls a timing of forming an image based on the interval difference and the value of Δv so as to reduce position misalignment.