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Patent Searching and Data


Title:
IMAGE PICKUP LENS
Document Type and Number:
Japanese Patent JP2001183578
Kind Code:
A
Abstract:

To provide a bright, inexpensive image pickup lens which is constituted of a small number of lenses, and which is used for a high performance CCD camera and a CMOS camera, etc.

In the image pickup lens, at least one surface of a 1st lens L1 is aspherical, an one or more surfaces of a 2nd lens L2 are aspherical, then, at least two or more surface are aspherical as a whole, and the following conditional expression are satisfied; 3.2f≤r3≤50f...(1), 0.9f≤d≤1.5f...(2), 0.1<f2/f1<0.9...(3), provided that f denotes the focal distance of the whole lens, f1 denotes the focal distance of the 1st lens L1, f2 denotes the focal distance of the 2nd lens L2, d denotes the distance from the surface 1 of the 1st lens to the surface 2 of the 2nd lens (whole lens length) and r3 denotes the radius of curvature on the object side of the 2nd lens.


Inventors:
Dou, Satoshi
Application Number:
JP1999000365536
Publication Date:
July 06, 2001
Filing Date:
December 22, 1999
Export Citation:
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Assignee:
MILESTONE KK
International Classes:
G02B9/10; G02B13/00; G02B13/18; H04N5/335; (IPC1-7): G02B9/10; G02B13/18; H04N5/335