| 摘要 |
An optical lens system for image taking includes, in order from an object side to an image side, a first lens element with positive refractive power having a convex object-side surface, a second lens element with negative refractive power having a concave object-side surface and a concave image-side surface with the at least one surface being aspheric, and a third lens element with positive refractive power having a convex object-side surface and a concave image-side surface with the at least one surface being aspheric. The image-side surface of the third lens element includes at least one inflection point. By adjusting spacing between any two lens elements, the optical lens system for image taking has a desirable space allocation and can effectively correct the Petzval Sum in order to obtain superior imaging quality.
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