发明名称 |
IR fast low light level lens system |
摘要 |
A compound lens for use in a low light level system operating in the near-infrared region. The lens system includes a high light-gathering ability requiring both a large aperture and good transmissivity over the wavelengths of interest. A wide field of view (e.g., 50 DEG ) without excessive chromatic and geometric aberrations that generally accompanies systems with a large aperture is provided. Space is provided in the lens system for a variable iris and variable density spot subassembly. Desired optical quantities are obtained through the use of zinc selenide as the material for an aspheric lens. The use of this diamond-turnable infrared material as a field lens yields exceptional performance for a fast (e.g., F/1.25) lens with a wide field of view.
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申请公布号 |
US5386315(A) |
申请公布日期 |
1995.01.31 |
申请号 |
US19930071610 |
申请日期 |
1993.06.04 |
申请人 |
MARTIN MARIETTA CORPORATION |
发明人 |
AMON, MAX;TEJADA, JOHN |
分类号 |
G02B13/14;G02B13/18;(IPC1-7):G02B15/16 |
主分类号 |
G02B13/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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