Lens Assembly
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United States of America Patent
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Jan 31, 2017
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Feb 26, 2014
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Abstract
A lens assembly includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens is with positive refractive power. The second lens is with negative refractive power. The third lens is with positive refractive power. The fourth lens is a meniscus lens and includes a concave surface facing the object side and a convex surface facing the image side. The fifth lens includes a concave surface facing the image side. The first lens and the third lens are made of the same material. An Abbe number of the first lens, an Abbe number of the third lens and an Abbe number of the fifth lens are greater than an Abbe number of the second lens. The fourth lens satisfies: 0.66≦f4/f≦0.7 wherein f is an effective focal length of the lens assembly and f4 is an effective focal length of the fourth lens.
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