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:
Dec. 31, 2013
Filed:
Feb. 12, 2010
Naoki Yoshida, Suwa, JP;
Masahiro Kanai, Suwa, JP;
Naoki Yoshida, Suwa, JP;
Masahiro Kanai, Suwa, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
There is provided an oscillation drive device that forms an oscillation loop with a vibrator for exciting a driving vibration on the vibrator. The oscillation drive device includes: a comparator that excites a driving vibration on the vibrator based on a signal in the oscillation loop with a given voltage as a reference; an oscillation detector that detects oscillation in the oscillation loop; a signal generation circuit that generates a switching control signal based on an oscillation result given by the oscillation detector; and a switch circuit inserted between the vibrator in the oscillation loop and an output of the comparator, wherein, during an oscillation startup stage in which oscillation in the oscillation loop is not detected by the oscillation detector, the switch circuit alternately switches, based on the switching control signal, between a period in which the output of the comparator and the vibrator are electrically connected and a period in which a predetermined set voltage is supplied to the vibrator.