Imaging lens and imaging apparatus
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United States of America Patent
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Dec 30, 2014
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N/A
app pub date -
Nov 29, 2013
filing date -
Jun 22, 2011
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Abstract
An imaging lens consists of a first-lens having a meniscus-shape with its convex-surface facing an object-side and negative-refractive-power and second through fifth lenses, at least one of the surfaces of each of which is aspherical. An image-side surface of the second-lens has a concave-shape facing an image-side. The second-lens has negative-refractive-power. An object-side surface of the third-lens has a convex-shape facing the object-side. The third-lens has positive-refractive-power. An image-side surface of the fourth-lens has a convex-shape facing the image-side. The fourth-lens has positive-refractive-power. The fifth-lens has a meniscus-shape with its convex-surface facing the image-side and negative-refractive-power. Predetermined conditional formulas about a combined paraxial focal-length of the third-lens and the fourth-lens, a distance on an optical-axis from an object-side surface of the first-lens to an image-plane, and a distance on the optical-axis from the object-side surface of the first-lens to the image-side surface of the second-lens are satisfied.
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