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:
Mar. 17, 1981
Filed:
Apr. 24, 1979
Applicant:
Inventors:
Akihiro Takeuchi, Nagoya, JP;
Kiyokazu Asai, Nagoya, JP;
Assignee:
Kabushiki Kaisha Toyota Chuo Kenkyusho, Nagoya, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
310316 ;
Abstract
An electrical circuit for driving a piezoelectric transducer includes a DC electric source, a constant current circuit, connected to the DC electric source for processing a DC signal from the DC electric source and supplying a constant output current having a predetermined constant value, and an oscillation circuit connected to the constant current circuit for driving the piezoelectric transducer with a resonance frequency and with a constant current. The electrical circuit approximately drives the piezoelectric transducer with a constant current by supplying the constant current to the oscillation circuit.