Title:
OPTICAL LENS
Document Type and Number:
WIPO Patent Application WO/2009/132539
Kind Code:
A1
Abstract:
An optical lens comprises a lens group and a diaphragm (1) located in front of the lens group. The lens group comprises a first lens (L1), a second lens (L2), and a third lens (L3) in order. The first lens is a concave-flat negative lens, the second lens is a meniscus positive lens with a concave surface facing to the diaphragm, and the third lens is a biconvex positive lens. The ratios of the focal lengths f1, f2 and f3 of the first, the second and the third lenses to the focal length f of the whole optical system, respectively, satisfy the following relationships：-0.6
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Inventors:
GAO YUNFENG (CN)
LI JIAYING (CN)
BAO RUIWU (CN)
SUN BO (CN)
ZHOU CHAOMING (CN)
LI JIAYING (CN)
BAO RUIWU (CN)
SUN BO (CN)
ZHOU CHAOMING (CN)
Application Number:
PCT/CN2009/070904
Publication Date:
November 05, 2009
Filing Date:
March 20, 2009
Export Citation:
Assignee:
HANS LASER TECHNOLOGY CO LTD (CN)
GAO YUNFENG (CN)
LI JIAYING (CN)
BAO RUIWU (CN)
SUN BO (CN)
ZHOU CHAOMING (CN)
GAO YUNFENG (CN)
LI JIAYING (CN)
BAO RUIWU (CN)
SUN BO (CN)
ZHOU CHAOMING (CN)
International Classes:
G02B13/00; G02B9/12; G02B26/10
Foreign References:
| CN101324696A | 2008-12-17 | |||
| US4880299A | 1989-11-14 | |||
| JPS63104009A | 1988-05-09 | |||
| JPH0497211A | 1992-03-30 | |||
| JPS62254110A | 1987-11-05 | |||
| JPH0252307A | 1990-02-21 |
Attorney, Agent or Firm:
SHENZHEN ZHONGYI PATENT AND TRADEMARK OFFICE (Old Shenzhen Special Zone Newspaper BuildingNo.1014, Shennan Road C., Futia, Shenzhen Guangdong 8, CN)
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