Title:
IMAGE PICKUP LENS
Document Type and Number:
Japanese Patent JP3393186
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: 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.
SOLUTION: 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≤&verbar r3&verbar ≤50f...(1), 0.9f≤d≤1.5f...(2), 0.1<&verbar f2&verbar /&verbar f1&verbar <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:
Do Satoshi
Application Number:
JP36553699A
Publication Date:
April 07, 2003
Filing Date:
December 22, 1999
Export Citation:
Assignee:
Milestone Co., Ltd.
International Classes:
G02B9/10; G02B13/00; G02B13/18; H04N5/335; (IPC1-7): G02B9/10; G02B13/18
Domestic Patent References:
| JP2001174701A | ||||
| JP2000321489A |
Attorney, Agent or Firm:
Takashi Ogaki
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