Wide-angle lens system

Details Wide-angle lens system Wide-angle lens system

2008-01-29

2008-01-29

Spector, David N. (Department: 2873)

Optical: systems and elements

Lens

Reverse telephoto

C359S749000, C359S754000

Reexamination Certificate

active

07324293

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 R1 lens element and a negative R2 lens element, a positive R3 lens element having a convex surface facing toward the image, and a positive R4 lens element, in this order from the object.The wide-angle lens system satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?−0.8<f1a/f1b<−0.1   (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.6<f/fR<1.1   (2)in-line-formulae description="In-line Formulae" end="tail"?whereinf1a designates the focal length of the negative first sub-lens group;f1b 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.

REFERENCES:
patent: 5790324 (1998-08-01), Park
patent: 6924947 (2005-08-01), Saori
patent: 7106520 (2006-09-01), Saori
patent: 2007/0002456 (2007-01-01), Saori
patent: 2007/0002457 (2007-01-01), Saori
patent: 2007/0002458 (2007-01-01), Saori
patent: 2007/0201141 (2007-08-01), Kato et al.
patent: 62-168108 (1987-07-01), None
patent: 7-261076 (1995-10-01), None
patent: 10-031153 (1998-02-01), None
English Language Abstract of JP 7-261076.
U.S. Appl. No. 11/677,713 to Kato et al., filed Feb. 22, 2007.

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