Zoom lens system

Details Zoom lens system Zoom lens system

2007-08-28

2008-10-14

Choi, William C. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S557000, C359S740000, C359S781000

Reexamination Certificate

active

07436600

ABSTRACT:
A zoom lens system comprises: a first lens group with a negative refractive power, a second lens group with a negative refractive power, a third lens group with a positive refractive power and a fourth lens group with a positive refractive power. When zooming between the wide mode and the tele mode, the second, third, and fourth lens groups move along the optical axis, the zoom lens system of the present invention can truly be miniaturized, and the zoom ratio is ensured within 2.8-3.0.

REFERENCES:
patent: 7218455 (2007-05-01), Iwasawa
patent: 7342727 (2008-03-01), Iwasawa

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