Light beam scanning device

Details Light beam scanning device Light beam scanning device

1977-06-17

1978-08-22

Corbin, John K.

Recorders

Record receiver deforming

346108, 350226, 350232, 358199, G02B 2717

Patent

active

041085329

ABSTRACT:
This specification discloses a light beam scanning device in which a light spot is moved at a uniform velocity on a surface to be scanned. The light beam scanning device comprises a light source, a vibratory mirror and a focusing lens system. The vibratory mirror has its rotational angle (.phi.) vibrated at .phi..sub.o sin k.sub.1 t, and the light source is disposed at a location spaced apart by a distance r with respect to the center of the vibratory mirror. The focusing lens has a distortion characteristic expressed as: ##EQU1## WHERE Y' REPRESENTS THE IMAGE HEIGHT, L IS THE DISTANCE BETWEEN THE CENTER OF THE VIBRATORY MIRROR AND THE NODAL POINT OF THE FOCUSING LENS ON THE ENTRANCE SIDE THEREOF, F(.theta.) equals ##EQU2## WHERE F(.theta.) EQUALS .sqroot.R.sup.2 COS.sup.2 .theta. - L.sup.2 SIN.sup.2 .theta. - LSIN.sup.2 .theta., AND .theta. REPRESENTS THE ANGLE FORMED BETWEEN THE SCANNING BEAM DIRECTED TOWARD THE ENTRANCE SIDE NODAL POINT OF THE FOCUSING LENS AND THE OPTIC AXIS OF THE FOCUSING LENS.

REFERENCES:
patent: 3345120 (1967-10-01), Palmer
patent: 3573849 (1971-04-01), Herriot
patent: 3687025 (1972-08-01), Rosin
patent: 3719780 (1973-03-01), Gazard et al.

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