Imaging lens system

Details Imaging lens system Imaging lens system

2008-09-01

2010-06-22

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C348S340000, C359S716000

Reexamination Certificate

active

07742241

ABSTRACT:
An imaging lens system, in order from the object side to the image side thereof, includes a first lens with positive refractive power, a second lens with positive refractive power, a third lens with negative refractive power and an image sensing element. The imaging lens system satisfies the following formulas: L/TTL>1.23, and 0.3<G1R1/F1<0.4, where an active surface of the image sensing element is square and only includes effective pixels, and L is the length of one side of the active surface, image sensing element TTL is the distance along an optical axis thereof from the object-side lens surface of the first lens to an imaging plane of the image side, G1R1 is the radius of curvature of the object-side lens surface of the first lens, and F1 is the focal length of the first lens.

REFERENCES:
patent: 6525886 (2003-02-01), Lewis
patent: 7460315 (2008-12-01), Cheng et al.
patent: 7508601 (2009-03-01), Murakami et al.
patent: 7636207 (2009-12-01), Hsu
patent: 2010/0020419 (2010-01-01), Liang et al.

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