| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact and high-performance photographic lens which is constituted of three lenses, and whose telecentric characteristic is satisfactorily corrected, even though it has a wide viewing angle. SOLUTION: In the photographic lens where a first lens L1, an aperture diaphragm 1, a second lens L2 and a third lens L3 are arranged, in this order starting from the object side, the first lens L1 is a positive meniscus lens turning its convex surface to the object side, the second lens L2 is a positive meniscus lens turning its convex surface to an image side, and the third lens L3 is a biconcave lens having a stronger curvature for the object side than for the image side. The three lenses are formed of plastic lenses whose both surfaces are aspherical. COPYRIGHT: (C)2008,JPO&INPIT
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