Photographic lens system enabling reduction in tightness of manufacturing tolerance
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United States of America Patent
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May 12, 2015
Grant Date -
Mar 26, 2015
app pub date -
Dec 19, 2013
filing date -
Sep 24, 2013
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Abstract
A photographic lens system enabling reduction in tightness of manufacturing tolerance of lenses, which has five lenses: a first lens, a second lens, a third lens, a fourth lens and a fifth lens sequentially arranged along an optical axis from an object, wherein the first lens has strong positive refractivity, the second lens is a meniscus type lens and has weak positive refractivity, the third lens has upward convex-shaped positive refractivity, the fourth lens has upward convex-shaped negative refractivity, and the fifth lens has negative refractivity, wherein the lens system satisfies a relation, f2/f1>10, wherein f1 is a focal distance of the first lens, and f2 is a focal distance of the second lens.
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