| 摘要 |
A lens unit includes a first lens having positive power, an aperture stop, a meniscal second lens having negative power, a meniscal third lens having positive power, and a fourth lens including an object side surface and an image side surface, each being aspherical and including at least one inflection point. The image side surface is concave at an image side. The first lens, the aperture stop, the second lens, the third lens, and the fourth lens are arranged in order from an object side toward the image side. The first lens includes an image side surface that is convex at the image side. The second lens includes an object side surface that is convex at the object side.
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