Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Yong Joo Jo0
Jong Cheol Park0
Date of Patent
October 30, 2007
0Patent Application Number
117055370
Date Filed
February 13, 2007
0Patent Primary Examiner
Patent abstract
A subminiature imaging optical system suitable for a subminiature optical device such as a mobile phone camera. An aperture stop is provided. A first lens has a positive refractive power and is convex at an object side. A second lens has a negative refractive power. A third lens has a positive refractive power. Also, a fourth lens has a negative refractive power. The optical system has a total length along an optical axis direction according to following relation 1:1.2<TL/f<1.5relation 1,where TL is a distance from the aperture stop to an image plane, and f is an effective focal distance of an entire optical system.
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