Self-resonant scanner biasing system

Details Self-resonant scanner biasing system Self-resonant scanner biasing system

H - Electricity

04

N

341/105

H04N 3/08 (2006.01) H04N 1/053 (2006.01) H04N 1/113 (2006.01)

Patent

CA 1242782

ABSTRACT Integrations of the historical numbers of times that a light beam scanned in an oscillatory course by a self-reonant galvanometer scanner does traverse so far in a first direction co as to impinge upon a Beginning-of-Trace (BOT) sensor, and does traverse so far in the opposite direction so as to impinge upon an End-of-Trace (EOT) sensor, are each used to seperately control the voltage level developed in a first, BOT, electrical tank circuit and in a second, EOT, electrical tank circuit. Voltage from each tank circuit is amplified and applied to drive the self-resonant scanner, at a polarity to induce continued oscillation, during one-half of each oscillatory cycle. Amplitude and centering contol thereby obtained of the sinusoidal oscillation of the self resonant scanner is repeatable to better than one part in ten thousand between cycles.

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