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:
Oct. 26, 1999
Filed:
Feb. 20, 1997
Makoto Irie, Toyama, JP;
Abstract
A piezo-resonator included in a filter and/or an AM signal receiving circuit eliminates unwanted signals produced as a result of the piezo-resonator experiencing a mechanical impact. The piezo-resonator includes a piezoelectric substrate and first and second electrodes provided on opposite surfaces of the substrate. The first electrode is divided into three portions along its width by grooves extending along the longitudinal substrate. The grooves are formed so that the resulting divided portions are substantially symmetrical to each other with respect to the central axis extending along the longitudinal substrate. The peripheral portions of the divided electrode are used as one input/output terminal, while the central portion is used as the other input/output terminal. The piezo-resonator can be provided in at least the last stage of a plurality of resonators for use in a filter. Further, such piezo-resonators or filter can be used in an intermediate frequency filter contained in an AM signal receiving device.