Two-group zoom lens

Details Two-group zoom lens Two-group zoom lens

2006-01-24

2006-01-24

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S682000, C359S691000, C359S717000, C359S708000, C359S689000, C359S686000, C359S793000, C359S754000

Reexamination Certificate

active

06989941

ABSTRACT:
A comparatively low f-number, compact two-group zoom lens that corrects aberrations in the visible and the near-infrared regions includes, in order from the object side, a first lens group of negative refractive power and a second lens group of positive refractive power. The first lens group includes three lens components that are lens elements of negative, negative, negative, and positive refractive power, respectively, in order from the object side. The second lens group includes four lens components that are lens elements of positive, positive, negative, and positive refractive power, respectively, in order from the object side. Aspheric surfaces are disclosed. Certain conditions relating to the focal lengths of the two lens groups, the indexes of refraction, and Abbe numbers of various lens elements are satisfied to control aberrations in both the visible and the near-infrared regions.

REFERENCES:
patent: 6762887 (2004-07-01), Tomioka
patent: 2002/0126393 (2002-09-01), Nasu et al.
patent: 2002-196235 (2002-07-01), None
patent: 2002-244038 (2002-08-01), None

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