Light beam optical scanning system having an f.theta. mirror

Details Light beam optical scanning system having an f.theta. mirror Light beam optical scanning system having an f.theta. mirror

1994-01-25

1996-12-10

Reinhart, Mark J.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

359208, 347241, B41J 247

Patent

active

055835597

ABSTRACT:
A laser beam optical scanning system having a laser diode, a collimator lens, a cylindrical lens, a polygonal mirror and an f.theta. mirror. The f.theta. mirror has a free toric surface whose curvature in the main scanning direction varies in accordance with field angle. The variation of the curvature of the free toric surface is set in accordance with the position of the f.theta. mirror in the optical path, and this appropriate setting of the variation of the curvature enables the f.theta. mirror to correct both distortion and curvature of field in the main scanning direction.

REFERENCES:
patent: 5038156 (1991-08-01), Kuroda
patent: 5212501 (1993-05-01), Nakamura et al.

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