Imaging lens with high resolution and short overall length

Details Imaging lens with high resolution and short overall length Imaging lens with high resolution and short overall length

2007-11-28

2008-08-05

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S773000

Reexamination Certificate

active

07408723

ABSTRACT:
An exemplary imaging lens includes, in this order from the object side to the image side thereof, a first lens of positive refraction power, a second lens of negative refraction power, a third lens of positive refraction power, and a fourth lens of negative refraction power. The imaging lens satisfies the formulas of: (1) 1<T/F<1.29; (2) R3/F>15 and (3) R7>0, R6<0, where T is the overall length of the imaging lens, F is the effective focal length of the imaging lens, R3 is the radius of curvature of the object-side surface of the second lens, R6 is the radius of curvature of the image-side surface of the third lens, and R7 is the radius of curvature of the object-side surface of the fourth lens.

REFERENCES:
patent: 6917479 (2005-07-01), Park
patent: 6950246 (2005-09-01), Amanai
patent: 7012765 (2006-03-01), Matsui et al.
patent: 7061694 (2006-06-01), Amanai
patent: 7215492 (2007-05-01), Sato et al.
patent: 7274518 (2007-09-01), Tang et al.
patent: 2007/0081259 (2007-04-01), Noda

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