Light beam scanner with focus-varying mechanism

Details Light beam scanner with focus-varying mechanism Light beam scanner with focus-varying mechanism

1986-02-10

1988-03-22

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250236, 350 68, 358293, G02B 2717

Patent

active

047330643

ABSTRACT:
A light beam scanner includes a focus-varying mechanism disposed in a light beam path between a light beam source and a rotating polygonal mirror for adjusting focus position of a light beam as it falls on the rotating polygonal mirror, and a control circuit arrangement for controlling the focus-varying mechanism in synchronism with rotation of the rotating polygonal mirror so that the light beam can fall on the rotating polygonal mirror as a correct linear image at all times for thereby focusing the light beam as a spot image on the image-carrying surface being scanned.

REFERENCES:
patent: 4143403 (1979-03-01), Ohnishi
patent: 4170028 (1979-10-01), DeBenedictis et al.
patent: 4204233 (1980-05-01), Swager
patent: 4205348 (1980-05-01), DeBenedictis et al.
patent: 4400740 (1983-08-01), Traino et al.
patent: 4404596 (1983-09-01), Juergensen et al.
patent: 4587531 (1986-05-01), Dangler
patent: 4613877 (1986-09-01), Spencer et al.
patent: 4622593 (1986-11-01), Curry

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