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. 21, 2001
Filed:
Feb. 02, 2000
Masafumi Katsuno, Sendai, JP;
Yoshiaki Fuda, Natori, JP;
Tokin Corporation, Miyagi, JP;
Abstract
A piezoelectric transformer (,) comprises a piezoelectric rectangular body (,) equally divided into first to fourth regions (A,, A,, A,, and A,) in a longitudinal direction. The first and the fourth regions (A,, A,) are provided with plane electrodes (,and,) as input electrodes and polarized in a thickness direction. Strip-like electrodes (,) are formed at the boundary between the remaining second and third regions (A,A,) as output electrodes. An AC input voltage having a frequency corresponding to a wavelength equal to a half of the length of the piezoelectric rectangular body is applied to the input electrodes to vibrate the piezoelectric plate in a two-wavelength resonance mode. A voltage produced by a piezoelectric effect in response to the vibration is extracted from an output terminal. The transformer is small in size, low in vibration rate and heat generation, and excellent in efficiency. As a modification, the input electrodes may be formed in two or three regions which are opposite to each other in displacement distribution in the two-wavelength resonance without being restricted to the first and the fourth regions while the output electrode is provided in another region.