Wide-angle zoom lens system

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

2006-06-28

2008-10-28

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S680000

Reexamination Certificate

active

07443603

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"?0.9<f2/ft<1.2  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?2.9<f4/fw<3.4  (2)in-line-formulae description="In-line Formulae" end="tail"?whereinf2: the focal length of the positive second lens group;f4: the focal length of the positive fourth lens group;ft: the focal length of the entire wide-angle zoom lens system at the long focal length extremity; andfw: the focal length of the entire wide-angle zoom lens system at the short focal length extremity.

REFERENCES:
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patent: 5710669 (1998-01-01), Endo
patent: 5805351 (1998-09-01), Hayashi
patent: 6924947 (2005-08-01), Saori
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patent: 7110185 (2006-09-01), Saori
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patent: 2006/0056063 (2006-03-01), Saori et al.
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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 Abstract 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.
U.S. Appl. No. 11/427,046 to Saori, which was filed on Jun. 28, 2006.
U.S. Appl. No. 11/427,100 to Saori, which was filed on Jun. 28, 2006.

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