Zoom lens system

Details Zoom lens system Zoom lens system

2005-03-22

2005-03-22

Spector, David N. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S691000, C359S689000

Reexamination Certificate

active

06870688

ABSTRACT:
According to one aspect of the present invention, a zoom lens system includes, in order from an object along an optical axis, a first lens group having negative refractive power, and a second lens group having positive refractive power. A distance between the first lens group and the second lens group decreases when the state of lens group positions varies from a wide-angle end state to a telephoto end state. The second lens group is composed of, in order from the object, a first lens having positive refractive power, a first cemented lens having negative refractive power, and a second cemented lens having positive refractive power. The first cemented lens in the second lens group is constructed by a positive lens cemented with a negative lens. The second cemented lens in the second lens group is constructed by a negative lens cemented with a positive lens.

REFERENCES:
patent: 6124984 (2000-09-01), Shibayama et al.
patent: 6304389 (2001-10-01), Shibayama
patent: 6349002 (2002-02-01), Shibayama et al.
patent: 6614599 (2003-09-01), Watanabe
patent: 6643072 (2003-11-01), Mihara
patent: 20020012174 (2002-01-01), Horiuchi
patent: 11-23967 (1999-01-01), None

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