Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2006-09-05
2006-09-05
Gray, David M. (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S323170, C310S328000, C348S552000
Reexamination Certificate
active
07102270
ABSTRACT:
A first drive shaft is disposed with a first piezoelectric element at one end and a second piezoelectric element at the other end. A second drive shaft is disposed with the second piezoelectric element at one end and a third piezoelectric element at the other end. First and second lens holding frames are frictionally engaged with the first and second drive shafts respectively in a slidable manner. The first, second and third piezoelectric elements are expanded and contracted according to a drive signal and move the first and second lens holding frames in an axial direction respectively. When the moving velocity of the first and second lens holding frames are reduced, the phase difference between the drive signals, which are output to the respective piezoelectric elements, is adjusted so that the moving velocity becomes higher.
REFERENCES:
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patent: 5589723 (1996-12-01), Yoshida et al.
patent: 5726521 (1998-03-01), Kon et al.
patent: 6215605 (2001-04-01), Kuwana et al.
patent: 2006/0061234 (2006-03-01), Ito et al.
Naka Yoji
Noguchi Yukio
Onozuka Haruo
Gray David M.
Rosenau Derek
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