Galvanometric optical scanning system having a pair of closely l

Details Galvanometric optical scanning system having a pair of closely l Galvanometric optical scanning system having a pair of closely l

1987-12-18

1989-01-24

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

350 661, 350 691, 358293, H01J 314

Patent

active

048002704

ABSTRACT:
A galvanometric optical scanning system is disclosed. In order to compensate errors in phase, zero drift etc., beam position detection means is provided in an optical path of scanning beam of light and comprises a pair of closely located photodetectors. The pulses produced by the beam position detection means are processed to generate correction signals for various compensations.

REFERENCES:
patent: 4686363 (1987-08-01), Schoon
patent: 4700066 (1987-10-01), Horikawa

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