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. 21, 2000
Filed:
Aug. 10, 1998
Ronan Le Letty, Grenoble, FR;
Eta SA Fabriques d'Ebauches, Grenchen, CH;
Abstract
The transformer (1) includes a body (2) made of piezoelectric material having an outer lateral surface (E) in the shape of a circular cylinder. Primary electrodes (5, 7, 10, 12, 17, 19, 22, 24) are arranged on the body (2) so that, when the primary voltage (Up) which is applied thereto has a determined frequency (fr), the outer lateral surface (E) alternately takes the shape of a first and a second elliptical cylinder, the major axes of these latter being perpendicular to each other and perpendicular to the axis (A) of the circular cylinder. This vibration mode of the body (2) has a lower fundamental resonance frequency than that of the vibration mode of known transformer bodies having the same space requirement. The transformer (1) is thus well suited to being used in devices where the available space is limited for providing a relatively high AC voltage but having a relatively low frequency.