Title:
IMAGE PICKUP LENS
Document Type and Number:
Japanese Patent JP3751159
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an image pickup lens capable of maintaining desired optical performance, properly setting the power of a 1st lens and the power of a 2nd lens while a large back focus distance is secured, and being easily manufactured.
SOLUTION: This image pickup lens is composed of a 1st lens consisting of a concave lens and a 2nd lens 2 consisting of a convex lens. The 1st surface of the 1st lens 1 is made aspherical, the value of the focal length of the 2nd lens 2 to the total focal length is 1.0 to 1.2, the surface interval between the 1st lens 1 and 2nd lens 2 is 0.5 to 1 time the focal length of the whole lens system, and the focal length of the 2nd lens is 0.25 to 0.9 time the focal length of the 1st lens 1.
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Inventors:
Saito Mutual awareness
Isamu Kaneko
Isamu Kaneko
Application Number:
JP12628199A
Publication Date:
March 01, 2006
Filing Date:
May 06, 1999
Export Citation:
Assignee:
Enplus Inc.
International Classes:
G02B9/04; G02B13/18; (IPC1-7): G02B9/04; G02B13/18
Domestic Patent References:
| JP10104509A | ||||
| JP1090597A | ||||
| JP10115777A | ||||
| JP667091A | ||||
| JP10104511A | ||||
| JP3163509A | ||||
| JP4107407A |
Attorney, Agent or Firm:
Shunsuke Nakao
Takashi Ito
Takashi Ito