Image scanning lens and image scanning device that uses same

Details Image scanning lens and image scanning device that uses same Image scanning lens and image scanning device that uses same

2006-02-14

2006-02-14

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S771000

Reexamination Certificate

active

06999246

ABSTRACT:
An image scanning lens includes four lens components that may include five lens elements as follows: a first lens element having negative refractive power and a meniscus shape with its convex surface on the object side, a second lens element having positive refractive power and a meniscus shape with its convex surface on the object side, a stop, a third biconcave lens element cemented to a fourth biconvex lens element, and a fifth lens element having negative refractive power and a meniscus shape with its concave surface on the object side. The image scanning lens satisfies certain conditions related to the focal lengths of the first, second, and third lens components of the image scanning lens and to the anomalous dispersion of the second lens element. An image scanning device, such as an image scanner, with an image pickup device, such as a CCD, uses the image scanning lens.

REFERENCES:
patent: 6239921 (2001-05-01), Isono
patent: 6775074 (2004-08-01), Kasahara
patent: H5-264900 (1993-10-01), None
patent: H9-127414 (1997-05-01), None

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