Beam scanning optical system

Details Beam scanning optical system Beam scanning optical system

1991-08-29

1993-08-03

Arnold, Bruce Y.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359711, 346108, 250235, G02B 2608

Patent

active

052334570

ABSTRACT:
A beam scanning optical system having a semiconductor laser for emitting a light beam; a cylindrical lens for converging the laser beam into a straight line; a polygon mirror for deflecting the laser beam which converged the cylindrical lens at a constant angular velocity; a spherical mirror for collecting the deflected laser beam on a surface of a photosensitive member; and a lens disposed between the polygon mirror and the spherical mirror, the lens having at least one toroidal surface. The lens is so disposed that its beam entrance side and beam exit side are decentered in a direction of the beam scanning, and curvature of the entrance side and curvature of the exit side on a plane of deflection have different centers. The entrance side and the exit side of the lens are a toroidal surface and a spherical surface respectively, and the spherical surface is decentered in a direction perpendicular to the plane of deflection in respect to the toroidal surface. Also, the spherical mirror is decentered in a direction perpendicular to the plane of deflection.

REFERENCES:
patent: 3520586 (1970-07-01), Bousky
patent: 4585296 (1986-04-01), Mimoura et al.
patent: 4941719 (1990-07-01), Hisada et al.
patent: 4984858 (1991-08-01), Kuroda
patent: 5031979 (1991-07-01), Itabashi
patent: 5093745 (1992-03-01), Kuroda
patent: 5173798 (1992-12-01), Naiki

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