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:
Apr. 19, 2011
Filed:
Apr. 01, 2009
Norio Tomita, Nara, JP;
Yoshiteru Kikuchi, Nara, JP;
Kenichi Isomi, Nara, JP;
Yoshikazu Harada, Nara, JP;
Tetsushi Ito, Nara, JP;
Norio Tomita, Nara, JP;
Yoshiteru Kikuchi, Nara, JP;
Kenichi Isomi, Nara, JP;
Yoshikazu Harada, Nara, JP;
Tetsushi Ito, Nara, JP;
Sharp Kabushiki Kaisha, Osaka-Shi, JP;
Abstract
An image forming apparatus include: a plurality of photosensitive drums; a latent image forming unit for forming an electrostatic latent image on each photosensitive drum; a developing unit for developing each electrostatic latent image; a transferring unit for superimposing and transferring the developed images onto a moving record medium; a measurement unit for measuring positions of the transferred images on the record medium; and a control unit for controlling the photosensitive drums, the latent image forming unit, the developing unit, and the transferring unit. The control unit includes: a calculating unit for calculating a value related to alignment errors in the positions measured by said measurement unit in accordance with a sine-curve fitting method; and a correcting unit for correcting the alignment errors by the calculated value.