High-power, four group zoom lens

Details High-power, four group zoom lens High-power, four group zoom lens

2005-05-03

2005-05-03

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000, C359S686000, C359S772000, C359S774000, C359S775000

Reexamination Certificate

active

06888684

ABSTRACT:
A high-power, four-group zoom lens is disclosed which is formed of only four lens groups, in order from the object side, a first lens group of positive refractive power, a second lens group of negative refractive power, and third lens group of negative refractive power, and a fourth lens groups of positive refractive power. The fourth lens group includes, in order from the object side, a front lens subgroup and a rear lens subgroup. The rear lens subgroup includes, in order from the object side, a lens component of positive refractive power that includes a lens element, a pair of lens elements that may form a doublet component that includes a lens element of positive refractive power, a doublet component, and a lens component of positive refractive power. Specified conditions are satisfied to minimize lateral color and curvature of field.

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patent: 6490096 (2002-12-01), Miyano
patent: 2001-228396 (2001-08-01), None

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