Imaging lens system

Details Imaging lens system Imaging lens system

2011-01-04

2011-01-04

Dinh, Jack (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S714000, C359S765000, C359S766000

Reexamination Certificate

active

07864454

ABSTRACT:
The present invention provides an imaging lens system comprising, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power; a third lens element with positive refractive power, at least one of the object-side and image-side surfaces thereof being aspheric; a fourth lens element, the image-side surface thereof being aspheric and provided with at least one inflection point; a fifth lens element having a concave object-side surface, at least one of the object-side and image-side surfaces thereof being aspheric; and an aperture stop disposed between an imaged object and the second lens element. Such an arrangement of optical elements can effectively reduce the total track length and sensitivity of the optical system, and image quality can also be improved.

REFERENCES:
patent: 7365920 (2008-04-01), Noda
patent: 7502181 (2009-03-01), Shinohara

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