Lens assembly
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United States of America Patent
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Dec 20, 2016
Grant Date -
Apr 28, 2016
app pub date -
Oct 23, 2015
filing date -
Oct 27, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A lens assembly includes a first lens, a second lens, a stop, a third lens and a fourth lens, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens and the fourth lens are with negative refractive power. The second lens and the third lens are biconvex lenses with positive refractive power. The first, third, fourth lens include an object side surface and an image side surface respectively, wherein at least one of the object side surface and the image side surface is an aspheric surface. The lens assembly satisfies: 0<|f1/f2|<|f4/f3|<2, f/D12>1 wherein f1, f2, f3, f4, and f is an effective focal length of the first, second, third, fourth lens and the lens assembly, and D12 is an interval from the first lens to the second lens along the optical axis.
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