Light beam scanning optical system

Details Light beam scanning optical system Light beam scanning optical system

1990-08-01

1992-03-03

Ben, Loha

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

250235, G02B 2608

Patent

active

050937456

ABSTRACT:
In a light beam scanning optical system, a toroidal lens and a spherical mirror or a cylindrical mirror function in cooperation to rectify the scanning speed of a light beam deflected at an equiangular velocity by a rotative deflection device to be uniform over the range from the center to both edges of scanning area in the main scanning direction. The toroidal lens is further arranged to maintain each reflective facet of the rotative deflection device and the light collecting surface in the conjugate relation, thereby rectifying an error of image inclination of each reflective facet and at the same time regulating the direction of emission of the light beam so as to lessen the curvature of the field.

REFERENCES:
patent: 3469030 (1969-09-01), Priebe
patent: 3750189 (1973-07-01), Fleischer
patent: 3946150 (1976-03-01), Grafton
patent: 4520370 (1985-05-01), Fujii et al.
patent: 4704698 (1987-11-01), Reiniger
patent: 4759593 (1988-07-01), Kessler
patent: 4847492 (1989-07-01), Houki
patent: 4848864 (1989-07-01), Ostertag et al.
patent: 4984858 (1991-01-01), Kuroda

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