Optical scanning apparatus with dynamic scan path control

Details Optical scanning apparatus with dynamic scan path control Optical scanning apparatus with dynamic scan path control

1983-12-01

1986-07-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

358293, H01J 314

Patent

active

046008373

ABSTRACT:
The system includes a primary scanner which produces a scanning optical beam, and a photoresponsive error sensor which measures over the scan path the successive differences between the actual position of the scanning beam and the desired position of the scanning beam and produces error signals. The secondary scanner is connected to the error sensor for response to the error signals to dynamically correct the position of the scanning beam during the course of the scan. The primary scanner provides a main optical scanning beam and an auxiliary optical scanning beam traversing substantially the same optical path. The error sensor includes a graticule mask having a substantially uniform optical density along the desired scan path and a graded optical density transverse to the desired scan path of the auxiliary scanning beam.

REFERENCES:
patent: 4279472 (1981-07-01), Street
patent: 4314154 (1982-02-01), Minoura et al.
patent: 4429220 (1984-01-01), Noguchi
patent: 4490608 (1984-12-01), Yeadon et al.
patent: 4516023 (1985-05-01), Morrill et al.

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