Image scanner with a non-spherical f.theta. lens system

Details Image scanner with a non-spherical f.theta. lens system Image scanner with a non-spherical f.theta. lens system

1988-02-24

1989-09-12

Goldberg, E. A.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

350 68, G01D 942, G02B 2608

Patent

active

048664596

ABSTRACT:
A laser printer includes a semiconductor laser for generating a laser beam which is modulated according to information, a rotating polygon mirror for scanning the laser beam generated by the semiconductor laser, and an f.theta. lens system for imaging, onto a photosensitive drum, the laser beam scanned by the rotating polygon mirror. The f.theta. lens system has first and second lenses arranged, in this order, next to the rotating polygon mirror and on the optical path through which the laser beam is introduced from the rotating polygon mirror to the photosensitive drum. Each of the first and second lenses has light-entering and -emerging faces which are formed in a non-spherical shape.

REFERENCES:
patent: 4712884 (1987-12-01), Sakumo
patent: 4756583 (1988-07-01), Morimoto

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