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. 29, 2013
Filed:
Dec. 07, 2010
Saburo Manaka, Chiba, JP;
Akira Takakura, Chiba, JP;
Kenji Ogasawara, Chiba, JP;
Kazumi Sakumoto, Chiba, JP;
Shotaro Kamiyama, Chiba, JP;
Keishi Honmura, Chiba, JP;
Kosuke Yamamoto, Chiba, JP;
Hiroshi Shimizu, Chiba, JP;
Saburo Manaka, Chiba, JP;
Akira Takakura, Chiba, JP;
Kenji Ogasawara, Chiba, JP;
Kazumi Sakumoto, Chiba, JP;
Shotaro Kamiyama, Chiba, JP;
Keishi Honmura, Chiba, JP;
Kosuke Yamamoto, Chiba, JP;
Hiroshi Shimizu, Chiba, JP;
Seiko Instruments Inc., , JP;
Abstract
A stepping motor control circuit includes a rotation detection circuit that detects an induced signal and detects whether or not the induced signal exceeds a predetermined reference threshold voltage in a detection segment having a plurality of detection areas, and a control unit that determines the state of rotation of a stepping motor on the basis of a pattern indicating whether or not the induced signals exceed the reference threshold voltage and, on the basis of the result of detection, controls the driving of the stepping motor with anyone of a plurality of main drive pulses different from each other in energy or a correction drive pulse having larger energy than the main drive pulse. An ineffective area is provided between at least the two detection areas, and the control unit determines the state of rotation of the stepping motor without considering the induced signal.