Amplitude controlled torsion rod oscillator for scanning mirror

Electricity: motive power systems – Motor-reversing – Armature or primary circuit control


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318127, 350 7, G02B 2717




A mechanical oscillator for swinging an optical or other load element back and forth with a substantially constant amplitude. The oscillator is constituted by an erect torsion rod sustained in torsional vibration at its natural frequency by a drive motor energized by drive signals supplied by an external drive generator. The load element is secured to the free end of the rod, and in order to maintain the desired swing amplitude, a fixed pick-up coil is associated with an armature attached to the rod adjacent the free end thereof. Induced in the coil is a control signal whose frequency corresponds to the swing frequency and whose amplitude is proportional to the amplitude thereof. This control signal is applied to a controller adapted to so vary the output of said generator as to maintain a substantially constant swing amplitude.

patent: 3513415 (1970-05-01), Dostal
patent: 3609485 (1971-09-01), Dostal
patent: 3921045 (1975-11-01), Reich et al.


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