Scanning lens

Details Scanning lens Scanning lens

1995-12-13

1997-11-25

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359207, 359662, 359715, 359782, G02B 2608, G02B 958

Patent

active

056918356

ABSTRACT:
An f.theta. scanning lens arrangement, arranged from a polygonal mirror side to an imaging surface side, including a first, second, third, and fourth lens with having negative, positive, positive, and negative power, respectively, in the main scanning and subscanning directions is provided. The ratio of the focal length in the main scanning direction of the fourth lens versus the focal length in the main scanning direction of the entire f.theta. lens is selected to simultaneously minimize astigmatism, field curvature, and linearity error. Further, the ratio of the focal length in a subscanning direction of the first lens versus the focal length in the subscanning direction of the second lens is selected to minimize curving of scanning lines displaced from the optical axis.

REFERENCES:
patent: 4527858 (1985-07-01), Takahashi et al.
English Language Translation of JP 5-53076.

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