Light beam scanning apparatus

Details Light beam scanning apparatus Light beam scanning apparatus

1986-12-01

1987-09-15

LaRoche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

358293, H01J 502

Patent

active

046941649

ABSTRACT:
In a light beam scanning apparatus for scanning a light beam by use of a mechanical deflector such as a galvanometer mirror or a rotating polygonal mirror, the deviation of the light beam in the direction perpendicular to the scanning direction is corrected by a correcting light beam deflector. The correcting light beam deflector is driven by a control circuit in which a correcting signal is input. The correcting signal is obtained by a position detector which detects the position of a light beam scanned in correspondence with the scanning light beam. The position detecting light beam and the scanning light beam are caused to impinge upon the same point or points coincident with each other on a light deflector such as a galvanometer or a polygonal mirror so that the position detecting light beam may be deflected or deviated in correspondence with the scanning light beam.

REFERENCES:
patent: 4404596 (1983-09-01), Juergensen et al.
patent: 4564757 (1986-01-01), La Budde et al.

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