Wide-angle lens system

Details Wide-angle lens system Wide-angle lens system

2007-02-22

2008-08-12

Thompson, Timothy J (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S793000

Reexamination Certificate

active

07411746

ABSTRACT:
A wide-angle lens system includes a negative front lens group and a positive rear lens group, in this order from the object.The negative front lens group includes a negative first sub-lens group and a positive second sub-lens group, in this order from the object.The positive rear lens group includes cemented lens elements having a positive lens element, a negative lens element and a positive lens element.The wide-angle lens system satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?−0.8<fla/flb<−0.2  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.7<f/fR<1.1  (2)in-line-formulae description="In-line Formulae" end="tail"?whereinfla designates the focal length of the negative first sub-lens group;flb designates the focal length of the positive second sub-lens group;f designates the focal length of the entire wide-angle lens system; andfR designates the focal length of the positive rear lens group.

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English Language Abstract of JP 6-160706.
English Language Abstract of JP 9-113800.
English Language Abstract of JP 2001-013405.
English Language Abstract of JP 2001-330771.
English Language Abstract of JP 2002-303790.
English Language Abstract of JP 2003-121735.
U.S. Appl. No. 11/677,682 to Kato, which was filed on Feb. 22, 2007.

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