Optical: systems and elements – Lens – Multiple component lenses
Reexamination Certificate
2007-10-12
2010-02-09
Dinh, Jack (Department: 2873)
Optical: systems and elements
Lens
Multiple component lenses
C359S715000
Reexamination Certificate
active
07660049
ABSTRACT:
An optical lens system for taking image comprises four lens elements with refractive power, from the object side to the image side: a first meniscus lens element with negative refractive power; a second lens element with positive refractive power having a convex object-side and a convex image-side surface; a third lens element with negative refractive power having a concave object-side surface and a convex image-side surface; a fourth lens element with positive refractive power having a convex object-side surface and a concave image-side surface; and an aperture stop located between the object and the second lens element. The above arrangements effectively reduce the volume of the optical lens system while providing a relatively high resolution.
REFERENCES:
patent: 7095570 (2006-08-01), Amanai
Dinh Jack
Largan Precision Co., Ltd.
Shia Banger
LandOfFree
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