Self-resonant scanner biasing system

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

1986-01-21

1987-08-11

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

358208, 358293, H04N 308

Patent

active

046863630

ABSTRACT:
Integrations of the historical numbers of times that a light beam scanned in an oscillatory course by a self-resonant galvanometer scanner does traverse so far in a first direction so 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 separately 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 control thereby obtained of the sinusoidal oscillation of the self-resonant scanner is repeatable to better than one part in ten thousand between cycles.

REFERENCES:
patent: 4204233 (1980-05-01), Swager
patent: 4400740 (1983-08-01), Traino et al.
patent: 4541061 (1985-09-01), Schoon
patent: 4571623 (1986-02-01), Schoon
patent: 4587531 (1986-05-01), Dangler

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