Standard zoom lens system

Details Standard zoom lens system Standard zoom lens system

2007-12-17

2009-10-27

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

07609456

ABSTRACT:
A standard zoom lens system including a positive first lens group, a negative second lens group, a positive third lens group and a positive fourth lens group. Upon zooming from the short focal length extremity to the long focal length extremity, the positive first lens group, the positive third lens group and the positive fourth lens group move toward the object, and the negative second lens group moves toward the image and thereafter moves toward the object. The positive first lens group includes a negative lens element and a positive lens element. The standard zoom lens system satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?7.5<f1/|f2|<9.5  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?3.0<f1/f3<5.0  (2)in-line-formulae description="In-line Formulae" end="tail"?whereinf1 designates the focal length of the positive first lens group;f2 designates the focal length of the negative second lens group; andf3 designates the focal length of the positive third lens group.

REFERENCES:
patent: 6191895 (2001-02-01), Arimoto et al.
patent: 6353505 (2002-03-01), Yoneyama
patent: 6487023 (2002-11-01), Yoneyama
patent: 6822807 (2004-11-01), Yoneyama
patent: 6867925 (2005-03-01), Sato
patent: 7283311 (2007-10-01), Saori
patent: 7301711 (2007-11-01), Saori
patent: 7333274 (2008-02-01), Hozumi
patent: 7339748 (2008-03-01), Terada et al.
patent: 2003/0165020 (2003-09-01), Satori et al.
patent: 2004/0223070 (2004-11-01), Shirasuna
patent: 2005/0243437 (2005-11-01), Hozumi et al.
patent: 2007/0127136 (2007-06-01), Saori
patent: 2002-6217 (2002-01-01), None
patent: 2003-50350 (2003-02-01), None
patent: 2004-37921 (2004-02-01), None
patent: 2004-333770 (2004-11-01), None

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