Subminiature imaging optical system

Optical: systems and elements – Lens – Multiple component lenses

Reexamination Certificate

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C359S716000, C359S740000

Reexamination Certificate

active

07742240

ABSTRACT:
There is provided a subminiature imaging optical system utilizing only three sheets of lenses having positive, negative and positive refractive powers, respectively. The subminiature imaging optical system comprising, sequentially from an object side: a first lens having a meniscus shape with a convex object-side surface, the first lens having at least one aspherical surface and positive refractive power; a second lens having a meniscus shape with a convex image-side surface, the second lens having at least one spherical surface and negative refractive power; and a third lens having both surfaces formed of an aspherical surface and having positive refractive power.

REFERENCES:
patent: 7236314 (2007-06-01), Liao
patent: 7408725 (2008-08-01), Sato
patent: 2006/0152824 (2006-07-01), Sun
patent: 2004-219982 (2004-08-01), None
Korean Patent Office Action, mailed Feb. 28, 2008 and issued in corresponding Korean Patent Application No. 10-2007-0025981.

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