Compact imaging lens assembly

Details Compact imaging lens assembly Compact imaging lens assembly

2010-05-25

2010-11-23

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S793000

Reexamination Certificate

active

07839580

ABSTRACT:
This invention provides a compact imaging lens assembly comprising, in order from an object side to an image side: a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a second lens element with positive refractive power, at least one of the object-side and image-side surfaces thereof being aspheric; and an aperture stop disposed between the second lens element and an image plane; wherein there are two lens elements with refractive power in the compact imaging lens assembly; and wherein the compact imaging lens assembly satisfies the relations: 0.40<f/f2<1.20, |R3/R4|>1.5. Such an arrangement of optical elements can effectively improve the image quality of the system, reduce the total track length of the lens assembly while maintaining a sufficient back focal length, and achieve a wide field of view.

REFERENCES:
patent: 7446955 (2008-11-01), Noda
patent: 2004/0179276 (2004-09-01), Yamakawa

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