Light-beam scanning apparatus having two beam waists

Details Light-beam scanning apparatus having two beam waists Light-beam scanning apparatus having two beam waists

1987-03-13

1988-10-04

Henry, Jon W.

350 65, G02B 2610

Patent

active

047752050

ABSTRACT:
A light beam scanning apparatus including a light source for emitting a light beam and a rotatable polygon mirror having at least one surface for reflecting the light beam to a second surface being scanned. A flat field lens is provided between the polygon mirror and the second surface and an optical system is provided close to the second surface. The optical system has a light converging effect only in the vertical direction perpendicular to the scanning direction, and the light beam forms a first beam waist between the flat field lens and the optical system, and a second beam waist substantially on the second surface.

REFERENCES:
patent: 4294506 (1981-10-01), Hattori

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