Wide angle lens system

Details Wide angle lens system Wide angle lens system

2009-12-21

2011-11-08

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S708000, C359S716000

Reexamination Certificate

active

08054563

ABSTRACT:
The present disclosure relates to a wide angle lens system. The wide angle lens system includes, in order from the object side to the image side thereof, a first lens of positive refraction power, a second lens of positive refraction power, and a third lens of negative refraction power. The wide angle lens system satisfies the following condition: 0.45<f/TTL<0.75; and 1.4<f1/f<2.4. Wherein, TTL is a distance from a surface of the first lens facing the object side of the wide angle lens system to an image plane, f is a focal length of the wide angle lens system, and f1 is a focal length of the first lens.

REFERENCES:
patent: 7443613 (2008-10-01), Noda
patent: 7636207 (2009-12-01), Hsu
patent: 2004/0240082 (2004-12-01), Amanai
patent: 2005/0117047 (2005-06-01), Isono
patent: 2008/0024880 (2008-01-01), Tang
patent: 1766691 (2006-05-01), None
patent: 101369045 (2009-02-01), None
patent: 2005164872 (2005-06-01), None

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