Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1988-07-07
1990-01-16
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310366, 310358, H01L 4108
Patent
active
048945803
ABSTRACT:
A chip-type resonator comprises a piezoelectric member, a plurality of inner electrodes embedded in the piezoelectric member parallel to one another and spaced apart at intervals along the direction of thickness, and a pair of outer electrodes provided on side surfaces of the piezoelectric member and connected with the inner electrodes. The inner electrodes are provided in an odd number of at least three. The piezoelectric member is so polarized that one of its portions located between one pair of the inner electrodes expands and another portion between an adjacent pair contracts upon application of voltage between the outer electrodes.
This chip-type resonator is manufactured by preparing a plurality of sheets for providing a piezoelectric member, forming electrodes on the same, stacking and firing the same and performing the prescribed polarization.
REFERENCES:
patent: Re27116 (1971-04-01), Miller
patent: 3590287 (1971-06-01), Berlincourt et al.
patent: 4240003 (1980-12-01), Larson, III
patent: 4564782 (1986-01-01), Ogawa
patent: 4593160 (1986-06-01), Nakamura
patent: 4649313 (1987-03-01), Ogawa et al.
patent: 4742264 (1988-05-01), Ogawa
Budd Mark O.
Murata Manufacturing Co. Ltd.
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