| 摘要 |
PROBLEM TO BE SOLVED: To provide an imaging lens capable of securely imaging an image of a component irrespective of variation in the component, in the imaging lens applied to a recognition camera of a mounting machine or the like. SOLUTION: The imaging lens includes, from an object side to an imaging surface side, a first lens 1 having a positive refractive index and having the biconvex shape with convex surfaces directed to the object side and the imaging surface side, a second lens 2 having a positive refractive index and having a meniscus shape with a convex surface directed to the object side, a third lens 3 having a negative refractive index and having a biconcave shape with concave surfaces directed to the object side and the imaging surface side, an aperture diaphragm SD having a prescribed diameter, a fourth lens 4 having a negative refractive index and having a biconcave shape with concave surfaces directed to the object side and the imaging surface side, and a fifth lens 5 joined to the concave surface of the fourth lens 4 at the imaging side and having a biconvex shape with convex surfaces directed to the object side and the imaging surface side. Thus, the working distance can be made large while achieving reduced size, and telecentric properties at the object side are secured. COPYRIGHT: (C)2007,JPO&INPIT
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