Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1998-04-13
2000-11-14
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
31032317, 31032321, 310346, H02N 200
Patent
active
061474347
ABSTRACT:
A drive device using a piezoelectric transducer for correcting a shift of a position of a drive system based on a change in an environmental state such as environmental temperature, in which a drive member coupled to the piezoelectric transducer is driven by causing displacements having different speeds by applying drive pulses of saw tooth waves to the piezoelectric transducer thereby moving a slider block frictionally coupled to the drive member, an amount of a shift of a position of the slider block based on the change in the environmental temperature is previously stored to a memory, when a change in temperature is detected by a temperature sensor, the amount of the shift of the position of the slider block is calculated in accordance with the change in temperature and the shift of the position of the slider block is corrected by driving the piezoelectric transducer in a direction of correcting the shift amount by driving a fine adjustment circuit.
REFERENCES:
patent: 5089708 (1992-02-01), Asselbergs
patent: 5786654 (1998-07-01), Yoshida et al.
patent: 5907212 (1999-05-01), Okada
Nakano Haruyuki
Okamoto Yasuhiro
Shinke Satoshi
Yoshida Ryuichi
Dougherty Thomas M.
Minolta Co. , Ltd.
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