Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1997-02-20
1999-10-26
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310321, H03H 913, H01L 41047
Patent
active
059734426
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.
REFERENCES:
patent: 2262966 (1941-11-01), Rohde
patent: 3843897 (1974-10-01), Mishiro
patent: 5057802 (1991-10-01), Ozeki et al.
patent: 5392012 (1995-02-01), Iwata et al.
patent: 5717365 (1998-02-01), Kaida et al.
patent: 5765046 (1998-06-01), Watanabe et al.
patent: 5859488 (1999-01-01), Okeshi et al.
Dougherty Thomas M.
Keating, Esq. Joseph R.
Murata Manufacturing Co. Ltd.
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