Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1977-11-17
1979-11-20
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
73708, 73715, 73517AV, 310320, 310328, H01L 4110
Patent
active
041752430
ABSTRACT:
A fluid pessure transducer comprises a plate-like crystal. The pressure gives rise to a force which is applied by two seatings situated by opposing edges of a crystal in a direction generally along the face of the crystal. The change in oscillating frequencies of a part of the crystal provides a measure of the force and hence the fluid pressure.
In the past a second matched crystal has been employed to provide compensation for inaccuracy brought about by undesired frequency deviation due to ambient temperature change of the instrument. The present invention consists of a single crystal having on it two oscillating areas simulating the behaviour of the original pair of crystals. The single crystal facilitates manufacture of the device and improves the accuracy of the instrument.
REFERENCES:
patent: 3274828 (1966-09-01), Pulvari
patent: 3561832 (1971-02-01), Karrer et al.
patent: 3617923 (1971-11-01), Paradysz
patent: 3879992 (1975-04-01), Bartera
patent: 3882332 (1975-05-01), Frymoyer
patent: 3891870 (1975-06-01), Corbett
patent: 3978731 (1976-09-01), Reeder
patent: 4020448 (1977-04-01), Corbett
patent: 4039969 (1977-08-01), Martin
patent: 4067241 (1978-06-01), Corbett
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