ELECTROMECHANICAL TORSIONAL OSCILLATOR WITH RESONANT FREQUENCY AND AMPLITUDE CONTROL

摘要

ELECTROMECHANICAL TORSIONAL OSCILLATORWITH RESONANT FREQUENCY AND AMPLITUDE CONTROLABSTRACTA limited rotation electromechanical torsionaloscillator for driving a mirror in an optical deflection system.A drive armature is mounted on a torsion bar at the opposite endfrom the torsion bar support. The ends of the armature lie in anair gap between two pole pieces. The magnet flux in the gap iscaused to vary by means of a drive winding which results in armaturerotation. Resonant frequency is varied by adjustment of the lengthof the torsion bar and the flux density. Q is varied by means ofresistance in series with the drive winding.