| 摘要 |
Provided is a single-focus lens in which cost reduction and a simple configuration with a shorter overall length are realized as well as preferable optical performance is achieved. In the single-focus lens, consecutively arranged form the object side are a first lens which is a meniscus lens and its concave surface faces the object side, a second lens which is a meniscus lens and has at least one aspheric surface, a third lens, both of whose surfaces are concave surfaces, a fourth lens, both of whose surfaces are convex surfaces and a fifth lens which is a meniscus lens and its concave surface faces the image surface, the fifth lens having at least one aspheric surface. Preferably, the second lens and the fifth lens are made of optical plastics.
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