Afocal optical system for focus error correction in laser scanni

Details Afocal optical system for focus error correction in laser scanni Afocal optical system for focus error correction in laser scanni

1991-11-27

1993-10-26

Ben, Loha

Optical: systems and elements

Deflection using a moving element

359210, 359216, 2502014, G02B 2608

Patent

active

052571254

ABSTRACT:
A raster scanning system is disclosed which utilizes a focus error correction system and a pre-polygon cross-scan cylindrical lens for correcting focus error both in the fast-scan plane and in the cross-scan plane without affecting the scan characteristics of the post polygon optics. The focus error correction system comprises at least two lenses which can be either spherical or fast-scan cylindrical lenses and one of the lenses must be axially adjustable. By adjusting the adjustable lens, a positive or a negative optical power can be added to a beam passing through the focus error correction system in order to correct the focus error in the fast-scan plane. The pre-polygon cross-scan cylindrical lens is also adjustable to correct the focus error in the cross-scan plane.

REFERENCES:
patent: 4163600 (1979-08-01), Russell
patent: 4712887 (1987-12-01), Baer
patent: 5033806 (1991-07-01), Tomita et al.
patent: 5054866 (1991-10-01), Tomita et al.

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