Scanning optical system for use in a laser beam printer

Details Scanning optical system for use in a laser beam printer Scanning optical system for use in a laser beam printer

1989-03-13

1990-09-04

Arnold, Bruce Y.

350479, G02B 2610

Patent

active

049539264

ABSTRACT:
An optical scanning system for use in a laser beam printer is disclosed which comprises a cylindrical lens for imaging laser light in an auxiliary scanning cross section at a point in front of a deflector and an anamorphic scanning lens unit which converges the light rays deflected by the deflector at a point on a scanning surface. The scanning lens unit has, in order from the deflector side, a first lens which is a negative lens element having a concave toric surface with a stronger curvature in the auxiliary scanning cross section and a second lens having a convex toric surface with a stronger curvature in the auxiliary scanning cross section. The optical system further satisfying the following condition:

REFERENCES:
patent: 4707085 (1987-11-01), Takanashi et al.
patent: 4756583 (1988-07-01), Morimoto
patent: 4818046 (1989-04-01), Kondo
patent: 4859011 (1989-08-01), Takanashi

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