发明名称 |
Far-infrared camera lens, lens unit, and imaging apparatus |
摘要 |
A far-infrared camera includes three lenses formed of ZnS. A first lens is a biconvex lens, a second lens is a negative meniscus or biconcave lens, and a third lens is a positive meniscus lens. A diffraction surface is formed in either surface of a lens. When a total focal distance f of the lens system is 10 mm to 30 mm and a focal distance f12 of the first and second lenses is 20 mm to 70 mm, 1<=f12/f<=3.
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申请公布号 |
US2009067040(A1) |
申请公布日期 |
2009.03.12 |
申请号 |
US20080076335 |
申请日期 |
2008.03.17 |
申请人 |
SUMITOMO ELECTRIC INDUSTRIES, LTD.;SEI HYBRID PRODUCTS, INC. |
发明人 |
IZUMI TATSUYA |
分类号 |
G02B13/14 |
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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