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:
Feb. 17, 2015
Filed:
Oct. 02, 2012
Seiko Epson Corporation, Tokyo, JP;
Kunio Tabata, Shiojiri, JP;
Atsushi Oshima, Shiojiri, JP;
Hiroyuki Yoshino, Suwa, JP;
Noritaka Ide, Shiojiri, JP;
Yasuhiro Ono, Matsumoto, JP;
Atsuya Hirabayashi, Chino, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A power generation unit includes a first piezoelectric device having a pair of electrodes, a second piezoelectric device stacked on the first piezoelectric device, a switch electrically connected between the pair of electrodes, a current detection section adapted to detect a current generated in the second piezoelectric device, and a control section adapted to control the switch, and the control section electrically connects the switch for a predetermined period in at least either one of a case in which the current detected by the current detection section reaches a level one of equal to and higher than a first reference value or a case in which the current reaches a level one of equal to and lower than a second reference value.