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. 24, 2012
Yoshinao Yanagisawa, Ueda, JP;
Masahiro Oshio, Shiojiri, JP;
Takayuki Kikuchi, Okaya, JP;
Toshihiro Nishida, Nasushiobara, JP;
Masayuki Takahashi, Nasushiobara, JP;
Yoshinao Yanagisawa, Ueda, JP;
Masahiro Oshio, Shiojiri, JP;
Takayuki Kikuchi, Okaya, JP;
Toshihiro Nishida, Nasushiobara, JP;
Masayuki Takahashi, Nasushiobara, JP;
Seiko Epson Corporation, , JP;
Seiko NPC Corporation, , JP;
Abstract
A driver circuit includes a comparator (drive signal generation section) that generates a drive signal based on a signal obtained by converting an oscillation current of a vibrator that has been input via a first signal line into a voltage using an I/V conversion circuit (current/voltage conversion section), and supplies the drive signal to the vibrator via a second signal line, an oscillation detection circuit (oscillation detection section) that detects whether or not the oscillation current has reached a predetermined value after the vibrator has started to oscillate, a startup oscillation circuit (startup oscillation section) that assists an oscillation operation of the vibrator until the oscillation current reaches the predetermined value, and a switch that separates a capacitor from the second signal line until the oscillation current reaches the predetermined value, and connects the capacitor to the second signal line when the oscillation current has reached the predetermined value.