WIDE-ANGLE PHOTOGRAPHIC LENS SYSTEM ENABLING CORRECTION OF DISTORTION
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United States of America Patent
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Issued Date -
Mar 26, 2015
app pub date -
Dec 19, 2013
filing date -
Sep 24, 2013
priority date (Note) -
Abandoned
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Abstract
A wide-angle photographic lens system enabling correction of distortion composed of three lenses, in which a first lens, an iris, a second lens and a third lens sequentially arranged along an optical axis from an object, wherein the first lens has weak refractivity, the second lens has strong positive refractivity, and the third lens has negative refractivity, wherein the lens system satisfies relations, |f1/f|>2.8, f2/f<1, and te/tc<0.4, wherein f1 is a focal length of the first lens, f is a total focal length of all the lenses, f2 is a focal length of the second lens, te is a lens thickness on an effective diameter of a rear surface of the second lens, and tc is a center thickness of the second lens.
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