Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1980-04-16
1982-09-07
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310366, H01L 4108
Patent
active
043486096
ABSTRACT:
A piezoelectric plate is formed in a configuration defined by four sides, each pair of two adjacent sides defining an angle of each corner. In the case where the piezoelectric plate is configured as a rectangle or a parallelogram, two opposite sides have the same longer length, while the remaining opposite two sides have the same shorter length. For the purpose of suppressing a spurious vibration, the side ratio of the shorter side to the longer side is selected to be 0.7 to 0.98 in the range where no influence is exerted upon a vibration of the fundamental wave. In the case where the piezoelectric plate is configured as a parallelogram or a rhombus, it follows that two opposite angles out of the four angles are the same obtuse angle, while the remaining two opposite angles are the same acute angle. For the purpose of suppressing a spurious vibration, the above described acute angle is selected to be 75.degree. to 89.degree. in the range where no influence is exerted upon a vibration of the fundamental wave.
REFERENCES:
patent: 2064288 (1936-12-01), Bokovoy
patent: 2073046 (1937-03-01), Baldwin
patent: 2254866 (1941-09-01), Baldwin
patent: 2925502 (1960-02-01), Franx
patent: 3213207 (1965-10-01), Munk
patent: 3421109 (1969-01-01), Wiggins et al.
patent: 3717778 (1973-02-01), Nagata et al.
Budd Mark O.
Murata Manufacturing Co. Ltd.
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