Optical lens system for taking image

Details Optical lens system for taking image Optical lens system for taking image

2011-04-05

2011-04-05

Dinh, Jack (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S715000

Reexamination Certificate

active

07920340

ABSTRACT:
An optical lens system for taking image comprises: in order from the object side to the image side: an aperture stop; 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 having a concave object-side surface and a convex image-side surface; a plastic fourth lens element with negative refractive power having a concave image-side surface, the object-side and the image-side surfaces of the fourth lens element being aspheric. A focal length of the optical lens system for taking image is f, a focal length of the first lens element and the second lens element combined is f12, and they satisfy the relation: 0.98<f/f12<1.82.

REFERENCES:
patent: 7764442 (2010-07-01), Teraoka et al.

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