Optical lens system for taking image

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

2011-06-07

2011-06-07

Thompson, Timothy J (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S794000, C359S793000

Reexamination Certificate

active

07957076

ABSTRACT:
An optical lens system for taking image comprises, in order from an object side to an image side: a first lens element with positive refractive power having an aspheric convex object-side surface and an aspheric concave image-side surface; a second lens element with positive refractive power having an aspheric convex object-side surface and an aspheric concave image-side surface. Radii of curvature of the object-side surface of the first lens element, the object-side and image-side surfaces of the second lens element are R1, R3and R4respectively, focal lengths of the optical lens system for taking image, the first and second lens elements are f, f1, f2respectively, an on-axis distance between the first and second lens elements is T12, a center thickness of the second lens element is CT2, they satisfy the relations: 0.76 mm−1<1/R1<2.0 mm−1; 0.4<R3/R4<1.15; 0.35<(f/f1)−(f/f2)<0.72; T12/CT2>1.0.

REFERENCES:
patent: 5071235 (1991-12-01), Mori et al.
patent: 6885508 (2005-04-01), Yamaguchi et al.
patent: 7110190 (2006-09-01), Do et al.

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