| 摘要 |
PROBLEM TO BE SOLVED: To provide an enlarging imaging lens by which an excellent photographic image is obtained in the case of observing the tissue of a living body or a microorganism or the like by picking up the image thereof by a CCD. SOLUTION: The imaging lens is constituted by successively arranging a 1st biconvex lens 1 having positive refractive power, a 2nd biconvex lens 2 having positive refractive power, a 3rd meniscus lens 3 having negative refractive power and turning its concave surface toward an object side, a 4th meniscus lens 4 having positive refractive power, an aperture diaphragm 8 having a specified aperture, a 5th meniscus lens 5 having negative refractive power and turning its convex surface toward the object side, a 6th meniscus lens 6 having positive refractive power and turning its concave surface toward the object side, and a 7th meniscus lens 7 having positive refractive power and turning its convex surface toward the object side from the object side to an image surface side. Thus, the image of an observation object is vividly formed in wide field on the image-formation surface of the CCD, and the compact enlarging imaging lens suitable for an instrument for analysis or the like is obtained. COPYRIGHT: (C)2005,JPO&NCIPI
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