Optical: systems and elements – Lens – Including a nonspherical surface
Reexamination Certificate
2005-01-11
2005-01-11
Epps, Georgia (Department: 2873)
Optical: systems and elements
Lens
Including a nonspherical surface
C359S717000
Reexamination Certificate
active
06842295
ABSTRACT:
An imaging lens for an image pickup device is formed of only two lens components that are lens elements. An aperture diaphragm is on the object side of the object-side lens component. All four lens component lens surfaces are aspheric. The lens surface configuration near the optical axis of the object-side lens surface of the second lens component is convex. The lens surface configuration near the optical axis of at least one of the other three lens surfaces is concave. In various different embodiments, the lens surface configuration near the optical axis and the lens surface configuration near the periphery of a lens surface are different; the lens surface configuration of the intermediate portion of a lens surface differs from the other lens surface configurations; the Abbe numbers of the two lens elements satisfy a certain relationship; and a diffractive optical surface is used as one lens surface.
REFERENCES:
patent: 5502597 (1996-03-01), Estelle et al.
patent: 6011660 (2000-01-01), Nagahara
patent: 6416240 (2002-07-01), Johnson
patent: 6441971 (2002-08-01), Ning
patent: 6724532 (2004-04-01), Fu et al.
Arnold Bruce Y.
Arnold International
Epps Georgia
Fuji Photo Optical Co., Ltd.
Harrington Alicia M
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