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:
May. 26, 2015
Filed:
Aug. 21, 2013
Hiromichi Matsuda, Kanagawa, JP;
Katsuaki Miyawaki, Kanagawa, JP;
Tetsuo Watanabe, Kanagawa, JP;
Yasuhiro Maehata, Tokyo, JP;
Keisuke Shimizu, Tokyo, JP;
Hiromichi Matsuda, Kanagawa, JP;
Katsuaki Miyawaki, Kanagawa, JP;
Tetsuo Watanabe, Kanagawa, JP;
Yasuhiro Maehata, Tokyo, JP;
Keisuke Shimizu, Tokyo, JP;
RICOH COMPANY, LIMITED, Tokyo, JP;
Abstract
A rotating-body driving device that includes a rotating body; a driving source; a reduction gear that includes an output shaft and a gear rotating at a non-integer ratio of rotation period to a rotation period of the output shaft, and the reduction gear reducing rotation speed of the driving source; a pulse-signal generating unit; a pulse-count storage unit; a speed-fluctuation storage unit that stores therein a rotation speed fluctuation of the output shaft; and a driving-source control unit. The driving-source control unit detects the speed fluctuation information associated with the accumulated number of pulse signals from the speed-fluctuation storage unit, and performs for the driving source a feedforward control to set off the rotation speed fluctuation.