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:
Jun. 27, 2000
Filed:
May. 21, 1999
Applicant:
Inventors:
Shigeru Ando, Chiba, JP;
Muneo Harada, Osaka, JP;
Assignee:
Sumitomo Metal Industries Limited, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01H / ;
U.S. Cl.
CPC ...
73649 ; 310321 ;
Abstract
A vibration wave detector in which: a plurality of resonator beams, each having a different length and being allowed to resonate at a specific frequency, are provided; a piezoresistor is installed in each resonator beam; and the piezoresistors are parallel-connected so that vibration is converted to an electric signal by the piezoresistors so as to output the sum of vibration waveforms at the respective resonator beams. It is possible to control a gain of a specific frequency band by changing a voltage to be applied to the parallel circuit or changing the resistance value of each piezoresistor.