发明授权
- 专利标题： Fixed-focus lens
- 专利标题（中）： 定焦镜头
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申请号： US12015370申请日： 2008-01-16
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公开(公告)号： US07466501B1公开(公告)日： 2008-12-16
- 发明人: Yi-Hao Kang , Tao-Hung Kuo
- 申请人： Yi-Hao Kang , Tao-Hung Kuo
- 申请人地址： TW Hsinchu
- 专利权人： Young Optics Inc.
- 当前专利权人： Young Optics Inc.
- 当前专利权人地址： TW Hsinchu
- 代理机构： J.C. Patents
- 优先权： TW96127472 20070727
- 主分类号： G02B9/12
- IPC分类号： G02B9/12 ; G02B3/00
摘要：
A fixed-focus lens including a first lens group, a second lens group, and a third lens group arranged from an object side to an image side in sequence is provided. The first lens group has a negative refractive power, and includes at least one aspheric lens. The second lens group has a positive refractive power, and includes a lens. The third lens group has a positive refractive power, and includes a triple cemented lens. An effective focal length (EFL) of the fixed-focus lens is f. An EFL of the first lens group is f1. An EFL of the second lens group is f2. An EFL of the third lens group is f3. An axial distance between the first lens group and the second lens group is d. The fixed-focus lens satisfies: 2.5
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