Driving mechanism

Details Driving mechanism Driving mechanism

2006-03-24

2009-11-17

Assouad, Patrick J. (Department: 2862)

Photography

With exposure objective focusing means, focusing aid, or...

Lens drive circuit or motor structure

C396S185000, C396S248000, C396S261000, C310S323170

Reexamination Certificate

active

07620313

ABSTRACT:
A driving mechanism comprises: (i) an actuator comprising: an electro-mechanical conversion element; a driving member which is connected to one end of the electro-mechanical conversion element and moves according to elongation or contraction of the electro-mechanical conversion element; and a weight member provided on the other end of the electro-mechanical conversion element; (ii) a driven member frictionally engaged with the driving member; and (iii) a driving circuit that drives the actuator, wherein the actuator allows the driven member to move along the driving member, and the driving circuit drives the electro-mechanical conversion element at a driving frequency f which gives f≧21/2·f0when resonance frequency of a 1-freedom system is f0in which the electro-mechanical conversion element and the driving member are designated as a mass and the weight member is designated as a spring, and driving frequency of the electro-mechanical conversion element is f.

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