Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1992-07-16
1994-03-15
Voeltz, Emanuel T.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310359, 333189, H03H 9205, H01L 4108
Patent
active
052948625
ABSTRACT:
In radio communication equipment, a ladder-type piezo-electric filter is provided which operates in a high-frequency region of approximately 1.7 MHz-2 MHz. The filter is smaller than conventional ladder-type electric filters, less costly, and more easily handled and produced. In accordance with the present invention, rectangular piezo-resonators that longitudinally generate harmonic oscillation are used in the series and parallel branches of a ladder-type circuit. In each resonator, piezo-electric regions are formed by dividing surface electrodes with isolating slits. The slits are formed at the positions corresponding to the node points of the harmonic oscillation waveforms. For the piezo-resonators placed in the series branches of the ladder-type circuit, the piezo-electric regions are polarized in the same transverse direction. In each piezo-resonator used in a parallel branch, the piezo-electric regions are polarized in alternately opposite transverse directions. In addition, the divisional electrodes of the parallel branch piezo-resonators are bridged over with a suitable conductor, such as conductive paint, or the like.
REFERENCES:
patent: 3916490 (1975-11-01), Sheahan et al.
patent: 4287493 (1981-09-01), Masaie
patent: 4451753 (1984-05-01), Ogawa et al.
patent: 5077544 (1991-12-01), Ogawa et al.
patent: 5168253 (1992-12-01), Nakagawa et al.
Banno Hisao
Nakagawa Yasuhiko
LaBalle C.
NGK Spark Plug Co. Ltd.
Voeltz Emanuel T.
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