Scanning optical system with offset lens component

Details Scanning optical system with offset lens component Scanning optical system with offset lens component

1991-09-26

1993-02-23

Ben, Loha

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359206, 359207, G02B 2608

Patent

active

051895463

ABSTRACT:
An optical scanning system is disclosed having a polygon mirror which deflects a light beam from a semiconductor laser in a principal scanning direction, and an f.theta. lens which forms an image on a scanning surface of the light beam reflected by the polygon mirror. The f.theta. lens comprises a first lens group and a second lens group having a toric surface. The center axis of either the second lens group, or of only the toric surface of the same, is decentered from the optical axis of the first lens group towards one side of the principal scanning direction, the first lens group being positioned between the second lens group and the deflector.

REFERENCES:
patent: 3865465 (1975-02-01), Tatuoka et al.
patent: 4367009 (1983-01-01), Suzki
patent: 4585296 (1986-04-01), Minoura et al.
patent: 4930850 (1990-06-01), Morimoto
patent: 4953926 (1990-09-01), Morimoto
English Language Abstract of Japanese Publication 2-23313.

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