| 摘要 |
A subminiature optical system including: a first lens that is a biconvex lens with a positive refractive power; a second lens with a negative refractive power, the second lens formed in a meniscus shape convex toward an object side; a third lens with a positive refractive power, the third lens formed in a meniscus shape convex toward an image side; and a fourth lens with a negative refractive power, wherein a size in a direction of an optical axis satisfies Condition 1, and the refractive power of the first lens satisfies Condition 2, 1.2<TL/f<1.3 . . . Condition 1, 0.6<f 1 /f 1 <0.8 . . . Condition 2 where TL indicates a length from an aperture stop to an image-side surface, f indicates an effective focal length of the overall optical system, and f1 indicates a focal length of the first lens.
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