F-.theta. lens system and laser scanner using the same

Details F-.theta. lens system and laser scanner using the same F-.theta. lens system and laser scanner using the same

1991-02-26

1992-10-06

Arnold, Bruce Y.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359215, 359662, G02B 2608, G02B 300

Patent

active

051537672

ABSTRACT:
An f-.theta. lens system for directing a light beam deflected by a light deflector to a surface to be scanned is disclosed. The f-.theta. lens system include a first lens system arranged to face the light deflector and having a positive refractive power in a scan plane and a second lens system arranged to face the surface to be scanned and having a positive refractive power. A focal length f.sub.M of the overall system of the f-.theta. lens system in the main scan plane and a focal length f.sub.S of the overall system thereof in the sub-scan plane are different from each other. Further, a condition of D.sub.2 /f.sub.M .gtoreq.0.1 is satisfied, where D.sub.2 is a distance between the first lens system and the second lens system.

REFERENCES:
patent: 4707085 (1987-11-01), Takanashi et al.
patent: 4818046 (1989-04-01), Kondo
patent: 4846539 (1989-07-01), Takanashi et al.
patent: 4953926 (1990-09-01), Morimoto
patent: 4955682 (1990-11-01), Yamaguchi et al .
patent: 5015050 (1991-05-01), Itabashi

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