| 摘要 |
PROBLEM TO BE SOLVED: To provide a fisheye lens system capable of picking up an omnidirectional image with no lack in the central part of the image. SOLUTION: This fisheye lens system is constituted of the first group having negative refractive power, the second group having positive refractive power, and the third group having positive refractive power, in this order from an object side. The first group is constituted of the first negative meniscus-shaped lens with a convex face directed to the object side, the second negative meniscus-shaped lens with a convex face directed to the object side, and the third both-side-concaved lens with a strong refractive face directed to an image face side, in this order from the object side. The second group is constituted of a joined lens comprising the fourth positive lens with a strong refractive face directed to the object face side, a diaphragm, the fifth positive lens, the sixth both-side-concave-shaped negative lens, and the seventh positive lens. The third group is constituted of the 8-th positive lens with a strong refractive face directed to the object face side. The present invention is applicable in the fisheye lens system. COPYRIGHT: (C)2009,JPO&INPIT
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