Wide-angle zoom lens system

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

2007-10-16

2007-10-16

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S715000, C359S740000, C359S774000

Reexamination Certificate

active

11550118

ABSTRACT:
A wide-angle zoom lens system includes a positive first lens group, a negative second lens group, a positive 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 positive first lens group and the negative second lens group increases, a distance between the negative second lens group and the positive third lens group decreases, and a distance between the positive third lens group and the positive fourth lens group decreases. The wide-angle zoom lens system satisfies a number of conditions.

REFERENCES:
patent: 6462885 (2002-10-01), Nishio
patent: 6519094 (2003-02-01), Boku et al.
patent: 8-179212 (1996-07-01), None
patent: 2001-166208 (2001-06-01), None
patent: 2003-140048 (2003-05-01), None
patent: 2003-202499 (2003-07-01), None
patent: 2003-295060 (2003-10-01), None
U.S. Appl. No. 11/427,046 to Saori, which was filed on Jun. 28, 2006.
U.S. Appl. No. 11/427,075 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.
U.S. Appl. No. 11/427,127 to Saori, which was filed on Jun. 28, 2006.
English language Abstract of JP 2003-295060.
English language Abstract of JP2003-202499.
English language Abstract of JP 2003-140048.
English language Abstract of JP2001-166208.
English language Abstract of JP 8-179212.

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