IMAGING OPTICAL SYSTEM
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United States of America Patent
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Issued Date -
Jul 21, 2016
app pub date -
Jan 11, 2016
filing date -
Jan 16, 2015
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Abstract
An imaging optical system includes, at the vicinity of the optical axis, a positive first lens element having an object-side convex surface, a negative second lens element having an object-side concave surface, a positive third lens element having an image-side convex surface, and a fourth lens element having an image-side concave surface. The fourth lens element is provided with aspherical surfaces on both sides such that a combined refractive power thereof has an increasingly weaker negative refractive power toward the outer periphery thereof. The following conditions (1) and (2) are satisfied:
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