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:
Aug. 06, 1996
Filed:
Aug. 30, 1994
Nippondenso Co., Ltd., Kariya, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
A piezoelectric-element drive apparatus includes a direct-current power supply. An energy storing capacitor is connected in parallel with the direct-current power supply. An energy-transfer switching element becomes on when energy is transferred from the energy storing capacitor. A piezoelectric element connected in parallel with the energy storing capacitor receives energy and expands when the energy-transfer switching element becomes on. A discharging coil is connected in parallel with the piezoelectric element. A discharging switching element is operative for discharging the piezoelectric element via the discharging coil. A coupling transformer is provided between the energy storing capacitor and the piezoelectric element.