Wide-angle zoom lens system

Details Wide-angle zoom lens system Wide-angle zoom lens system

2007-07-24

2007-07-24

Ben, Loha (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000, C359S771000, C359S781000

Reexamination Certificate

active

11427100

ABSTRACT:
A wide-angle zoom lens system includes a negative first lens group, a positive second lens group, a negative third lens group and a positive fourth lens group), in this order from the object.Upon zooming from the short focal length extremity to the long focal length extremity, a distance between the negative first lens group and the positive second lens group decreases, a distance between the positive second lens group and the negative third lens group increases, and a distance between the negative third lens group and the positive fourth lens group decreases.The wide-angle zoom lens system satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?1.3<|f1|/fw<1.7 (f1<0)  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?2.5<f4/fw<3.3  (2)in-line-formulae description="In-line Formulae" end="tail"?whereinf1designates the focal length of the negative first lens group;f4designates the focal length of the positive fourth lens group; andfw designates the focal length of the entire wide-angle zoom lens system at the short focal length extremity.

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English language Abstract of JP 10-082954.
English language Abstract of JP 10-325923.
English language Abstract of JP 2001-083421.
English language Abstarct of JP 2001-318314.
English language Abstract of JP 2002-287031.
English language Abstract of JP 2004-061910.
English language Abstract of JP 2004- 240038.
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U.S. Appl. No. 11/427,075 to Saori, which was filed on Jun. 28, 2006.
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