Optical scanning device and a scanning lens therefor

Details Optical scanning device and a scanning lens therefor Optical scanning device and a scanning lens therefor

1996-10-24

1999-02-23

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359207, 359216, 359718, G02B 2608

Patent

active

058750517

ABSTRACT:
An optical scanning device includes a single scanning lens. At least one of opposite surfaces of the lens has a nonarcuate shape, as seen in a polarization plane. At least one of the opposite surfaces is a special toric surface. Further, in a plane perpendicular to the deflection plane, the lens has a meniscus shape and has the concave surface facing toward a deflector. With this configuration, the lens achieves a desirable uniform velocity scanning capability and a desirable field curvature in the main scanning direction. The lens is therefore free from errors in configuration ascribable to molding while reducing the limitation on the tolerance of optical elements in the optical axis direction as to assembly.

REFERENCES:
patent: 5005928 (1991-04-01), Suzuki et al.
patent: 5355244 (1994-10-01), Suzuki et al.
patent: 5459601 (1995-10-01), Suzuki et al.
patent: 5546216 (1996-08-01), Suzuki
patent: 5557448 (1996-09-01), Endo et al.
patent: 5563729 (1996-10-01), Nakamura et al.
patent: 5619362 (1997-04-01), Ota
patent: 5710654 (1998-01-01), Ota

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