F.theta. lens and image apparatus using the same

Details F.theta. lens and image apparatus using the same F.theta. lens and image apparatus using the same

1991-06-07

1992-05-05

Grimley, A. T.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

359662, G01D 942

Patent

active

051112191

ABSTRACT:
An f.theta. lens acting to effect uniform speed scanning while causing a light beam deflected at a uniform angular velocity by the deflecting surface of a deflector to be imaged on a plane to be scanned, wherein the shape of the curved surface of at least the lens surface of the lens which is adjacent to the deflection point side of the deflecting surface in the main scanning plane is an aspherical shape and particularly, near the optical axis, in at least the main scanning plane, this aspherical shape is convex toward the deflection point, and when the radius of curvature of this convex shape near the optical axis in the main scanning plane is r.sub.1 and the focal length of the f.theta. lens near the optical axis in the main scanning plane is fm,

REFERENCES:
patent: 4866459 (1989-09-01), Tokita et al.
patent: 4926195 (1990-05-01), Murahashi et al.
patent: 4989961 (1991-02-01), Yoshioka
patent: 5038156 (1991-08-01), Kuroda

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