Birch, Stewart, Kolasch & Birch, LLP
Driving apparatus, optical apparatus, and driving signal control circuit
A driving apparatus includes a piezoelectric element which undergoes expansion/contraction motion by a driving signal; a driving shaft which is mounted on the piezoelectric element, and undergoes reciprocating movement according to the expansion/contraction motion of the piezoelectric element; a first movement member which is friction-engaged with the driving shaft, and moves due to the reciprocating movement of the driving shaft; and a first control portion which applies driving signals to the piezoelectric element; the first control portion applies driving control pulse signals when the first movement member is to be moved, and applies stop control pulse signals when the stopped first movement member is not to be moved to put the first movement member into a vibration-arrested state. By this means, the stopped first movement member can be smoothly moved, and the first movement member in motion can be smoothly stopped.
Sanyo Semiconductor Co., Ltd. FUJIFILM Corporation Sanyo Electric Co., Ltd.
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H02N G02B H02N H02N H02N
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Hisao Takezo Yukihiko Tetsuya Hideo
Ito Nagamitsu Sigeoka Tokoro Yoshida