Wide-angle lens system

Details Wide-angle lens system Wide-angle lens system

2009-08-10

2010-11-30

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

Reverse telephoto

C359S784000

Reexamination Certificate

active

07843651

ABSTRACT:
A wide-angle lens system includes a negative first lens group, a negative second lens group and a positive third lens group, in this order from the object.The first lens group includes a negative meniscus lens element having the convex surface facing toward the object, and a positive lens element having a convex surface facing toward the object, in this order from the object. The first lens group includes at least one aspherical surface.The second lens group includes a negative meniscus lens element having the convex surface facing toward the object, and cemented lens elements having a positive lens element and a negative lens element, in this order from the object.The third lens group includes cemented lens elements having a negative lens element and a positive lens element, and a positive lens element having a convex surface facing toward the image, in this order from the object.

REFERENCES:
patent: 5390048 (1995-02-01), Miyatake et al.
patent: 5805349 (1998-09-01), Sato
patent: 7116499 (2006-10-01), Hirakawa
patent: 7426079 (2008-09-01), Yokoyama
patent: 2005/0237627 (2005-10-01), Hirakawa
patent: 2006/0126192 (2006-06-01), Ryu et al.
patent: 2007/0014025 (2007-01-01), Yokoyama
patent: 2007/0201140 (2007-08-01), Kato
patent: 2007/0201141 (2007-08-01), Kato et al.
patent: 2008/0106809 (2008-05-01), Hirano
patent: 9-113798 (1997-05-01), None
patent: 2005-316014 (2005-11-01), None
patent: 2006-301416 (2006-11-01), None
English language Abstract of JP 9-113798, May 2, 1997.
English language Abstract of JP 2005-316014, Nov. 10, 2005.
English language Abstract of JP 2006-301416, Nov. 2, 2006.

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