Wide-angle lens system

Details Wide-angle lens system Wide-angle lens system

2006-10-03

2006-10-03

Spector, David N. (Department: 2873)

Optical: systems and elements

Lens

Reverse telephoto

C359S749000

Reexamination Certificate

active

07116499

ABSTRACT:
A wide-angle lens system includes a negative first lens group, a negative second lens group, and a positive third lens group. The negative first lens group includes at least two negative meniscus lens elements each having the convex surface facing toward the object, and a positive lens element provided on the image-side of the two negative meniscus lens elements. The negative second lens group includes cemented lens elements and a negative meniscus lens element having the convex surface facing toward the object. The wide-angle lens system satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?f2-3/f>1.6  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?f3/f>1.5  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?(f2-3/f)/(f3/f)>1.0  (3)in-line-formulae description="In-line Formulae" end="tail"?whereinf2-3designates the combined focal length of the negative second lens group and the positive third lens group;f designates the focal length of the entire wide-angle lens system; andf3designates the focal length of the positive third lens group.

REFERENCES:
patent: 5724193 (1998-03-01), Hirakawa
patent: 5734510 (1998-03-01), Ito
patent: 5991093 (1999-11-01), Murata et al.
patent: 6697202 (2004-02-01), Mori
patent: 6735019 (2004-05-01), Kanai
patent: 6-160706 (1994-06-01), None
patent: 2003-029141 (2003-01-01), None
English language Abstract of JP 2003-029141.

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