| 摘要 |
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<0.2 relation 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.
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