Compact zoom lens

Details Compact zoom lens Compact zoom lens

2006-08-16

2008-05-20

Hasan, M. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S680000, C359S683000

Reexamination Certificate

active

07375899

ABSTRACT:
A compact zoom lens includes, in order from an object side to an image side, a first lens group (1) of negative refractive power, and second, third, fourth and fifth lens groups (2, 3, 4, 5) of positive refractive power. The second, third and fourth lens groups are movable to effect zooming and focusing. During zooming from the telephoto end to the wide-angle end, the fourth lens group moves from the object side to the image side. The compact zoom lens has a long back focal length with various aberrations satisfactorily corrected, and a small F-number for enhanced image brightness.

REFERENCES:
patent: 5619381 (1997-04-01), Anderson
patent: 6480340 (2002-11-01), Yamamoto
patent: 6590716 (2003-07-01), Narimatsu
patent: 6809877 (2004-10-01), Nagahara
patent: 7079324 (2006-07-01), Yamasaki

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