Compact zoom lens

Details Compact zoom lens Compact zoom lens

2006-08-16

2008-12-16

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S681000, C359S682000

Reexamination Certificate

active

07466494

ABSTRACT:
A compact zoom lens includes a first lens group (1, 3) of negative refractive power disposed on an object side and a second lens group (2, 4) of positive refractive power disposed on an image side. Both the first and second lens groups are movable. The first and second lens groups defines a variable distance therebetween. During zooming from the wide-angle end to the telephoto end, the second lens group moves toward the object side and the variable distance between the first and second lens groups decreases. The compact zoom lens has a long back focal length with various aberrations satisfactorily corrected.

REFERENCES:
patent: 5076677 (1991-12-01), Sato
patent: 5587840 (1996-12-01), Itoh
patent: 5619381 (1997-04-01), Anderson
patent: 6429978 (2002-08-01), Nishio
patent: 6590716 (2003-07-01), Narimatsu
patent: 7038857 (2006-05-01), Kuo
patent: 7242533 (2007-07-01), Ito
patent: 7277232 (2007-10-01), Sato
patent: 7375899 (2008-05-01), Kuo

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