Optical: systems and elements – Lens – Including a nonspherical surface
Reexamination Certificate
2008-05-13
2008-05-13
Sugarman, Scott J. (Department: 2873)
Optical: systems and elements
Lens
Including a nonspherical surface
C359S794000
Reexamination Certificate
active
11603014
ABSTRACT:
A subminiature imaging optical system with two lenses is provided. The optical system includes an aperture stop. A first meniscus lens has a positive refractive power, and includes aspherical surfaces at both of object and image sides. The object side of the first meniscus lens is convex. A second meniscus lens has a positive refractive power, and includes aspherical surfaces at both of the object and image sides. The image side of the second meniscus lens is convex. In addition, the first lens has a gap from the second lens according to following relation 1:in-line-formulae description="In-line Formulae" end="lead"?0.1<D/TL<0.2relation 1,in-line-formulae description="In-line Formulae" end="tail"?where D is the gap between the first and second lenses and TL is a distance from the aperture stop to an image plane. The invention ensures a high-definition subminiature imaging optical system improved in various aberrations and superior in MTF properties.
REFERENCES:
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Extended European Search Report, mailed Mar. 9, 2007 and issued in corresponding European Patent Application No. 06256038.8-2217.
Samsung Electro-Mechanics Co. Ltd.
Sugarman Scott J.
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