Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2006-10-03
2006-10-03
Schuberg, Darren (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S316010, C310S323160
Reexamination Certificate
active
07116033
ABSTRACT:
When starting a vibration-type drive device, the frequency of a drive signal is lowered from a predetermined frequency at a first change rate. When the vibration state of a vibration member reaches a predetermined state, it is determined whether or not a relative movement speed has reached a reference speed. When the relative movement speed has not reached the reference speed, the frequency of the drive signal is lowered at a second change rate that is smaller than the first change rate. This avoids problems which could occur when moisture intervenes on a slide surface of the vibration-type drive device, such as the vibration-type drive device not starting, and a desired rpm not being achieved.
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Fujimoto Kosuke
Seki Hiroyuki
Aguirrechea J.
Schuberg Darren
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