Optical system

Details Optical system Optical system

2006-12-19

2006-12-19

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S642000

Reexamination Certificate

active

07151636

ABSTRACT:
Among a plurality of lens units constituting an optical system, at least one of the plurality of lens units includes a refractive optical element made of a solid material that satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?3<νd<30in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.10<θgd<1.25in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.10<θgF<0.60in-line-formulae description="In-line Formulae" end="tail"?where νd is an Abbe number of the solid material and θgd and θgF represent partial dispersion ratios of the solid material. The refractive optical element made of the solid material has refractive power with a sign opposite to a sign of refractive power of the lens unit including the refractive optical element.

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patent: 2001-194590 (2001-07-01), None

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