Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1995-03-15
1996-12-31
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310323, H01L 4108, H02N 200
Patent
active
055897231
ABSTRACT:
A driving apparatus using a transducer. The apparatus comprises an electro-mechanical transducer, a driving shaft, a moving member and a pushing member. The driving shaft is coupled with the electro-mechanical transducer; the moving member is pushed against the driving shaft for frictional coupling therewith, the pushing member being interposed between the driving shaft and the moving member. The moving member is connected with the target moving object such as a lens mechanism. In operation, the electro-mechanical transducer is fed with driving pulses of a frequency of at least 18 kHz so that the transducer and the driving shaft will be displaced slowly in one direction and rapidly in the opposite direction, whereby the moving member coupled frictionally with the driving shaft is driven axially in a reciprocating manner at two different velocities. Repeating these operations allows the moving member to move slowly in the same axial direction in which the driving shaft is driven, whereby the lens mechanism or the like connected to the moving member is moved up to the desired position.
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Kuwana Minoru
Okamoto Yasuhiro
Yoshida Ryuichi
Dougherty Thomas M.
Minolta Co. , Ltd.
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