Patent ID: 6204811
Filing Date: 2001-03-20
Classification: H01P,H01Q,H02N

Abstract:
A piezoelectric actuator control circuit comprising:a support member defining a support portion and an opposite portion;a piezoelectric device having a first end attached to said support portion and a free end proximate said opposite portion;a first conductor attached to said opposite portion of said support member;a second conductor attached to said free end of said piezoelectric device such that said first and second conductors are spaced apart so as to define a gap and thereby form a capacitor;a drive circuit connected to said piezoelectric device for generating a drive signal for causing movement of said free end of said piezoelectric device and wherein movement of said free end varies the distance or gap between said first and second conductors to thereby change the capacitance or said capacitor formed by said first and second conductors; andan adjusting circuit responsive to said capacitance of said capacitor formed by said first and second conductors for adjusting said drive signal to locate said free end of said piezoelectric device at a selected position.