Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1998-04-14
2000-10-31
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310317, 310328, 310366, 31032302, H02N 200, H01L 4108
Patent
active
06140750&
ABSTRACT:
A linear actuator using a piezoelectric element having high mechanical strength, high driving efficiency and high reliability in which left and right end portions of the piezoelectric element in a tubular shape whose major component is PZT are fixedly supported by supporting members and a slider is frictionally coupled to the piezoelectric element, the slider frictionally coupled to the piezoelectric element is moved by causing elongation displacement and contraction displacement respectively to electrodes at the left and right end portions of the piezoelectric element when drive pulses each in a saw tooth wave having gradual rise portion and steep fall portion are applied to the electrodes at the left and right end portions of the piezoelectric element in a tubular shape and the slider can continuously be moved by continuously applying the drive pulses.
REFERENCES:
patent: 3246608 (1966-04-01), Cooper
patent: 4087715 (1978-05-01), Myer
patent: 4630941 (1986-12-01), Chainer et al.
patent: 4874979 (1989-10-01), Rapp
patent: 4947077 (1990-08-01), Murata
patent: 5589723 (1996-12-01), Yoshida et al.
Dougherty Thomas M.
Minolta Co. , Ltd.
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