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:
Jan. 30, 2018
Filed:
Jun. 30, 2016
Applicant:
Murata Manufacturing Co., Ltd., Nagaokakyo-shi, Kyoto-fu, JP;
Inventors:
Chikahiro Horiguchi, Nagaokakyo, JP;
Kohei Takahashi, Nagaokakyo, JP;
Assignee:
MURATA MANUFACTURING CO., LTD., Nagaokakyo-Shi, Kyoto-Fu, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G08B 21/00 (2006.01); H02N 2/18 (2006.01); G08C 17/02 (2006.01); H01L 41/113 (2006.01);
U.S. Cl.
CPC ...
H02N 2/181 (2013.01); G08C 17/02 (2013.01); G08C 2201/112 (2013.01); H01L 41/1134 (2013.01);
Abstract
A piezoelectric device is connected in parallel with a diode, and outputs a power generation voltage when depressed. When the power generation voltage exceeds a first threshold voltage, a load switch control circuit makes a load switch be conductive, and when the generated voltage becomes lower than a second threshold voltage, the load switch is cut off. Further, when depression is released, the piezoelectric device is discharged by the diode such that the amount of charge remaining in the piezoelectric device becomes zero.