Imaging lens
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United States of America Patent
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Jan 30, 2018
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app pub date -
Apr 7, 2015
filing date -
Apr 10, 2014
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Abstract
A compact low-cost imaging lens with an F-value of 2.5 or less which achieves both low-profileness and a wide field of view and corrects various aberrations properly. It includes elements arranged from an object side to an image side as follows: a first lens with positive refractive power having a convex object-side surface; a second lens with negative refractive power having a concave object-side surface; a third lens with positive refractive power having convex object-side and image-side surfaces and having at least one aspheric surface; a fourth lens with positive refractive power as a double-sided aspheric lens having a convex image-side surface; and a fifth lens with negative refractive power as a double-sided aspheric lens having a concave image-side surface. The imaging lens satisfies a conditional expression 20<νd1−νd2<50, where νd1 denotes Abbe number of the first lens at d-ray, and νd2 denotes Abbe number of the second lens at d-ray.
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