Two element optical system for focus error correction in laser s

Details Two element optical system for focus error correction in laser s Two element optical system for focus error correction in laser s

1992-11-27

1994-01-04

Ben, Loha

Optical: systems and elements

Deflection using a moving element

359201, 359210, 359216, 2502014, 250236, G02B 2608

Patent

active

052765440

ABSTRACT:
A raster scanning system is disclosed which utilizes a focus error correction system for correcting a 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 axially adjustable lenses. One of the lenses is spherical and the other is cylindrical in the fast scan plane. The spherical lens has to be adjusted first to correct the focus error in the cross-scan plane. Next, the cylindrical lens should be adjusted to correct the focus error in the fast-scan plane.

REFERENCES:
patent: 4838632 (1989-06-01), Manian
patent: 5054866 (1991-10-01), Tomita et al.
patent: 5055663 (1991-10-01), Morimoto et al.

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