发明名称 |
OPTICAL FILTER |
摘要 |
An optical filter for use in a field-sequential colour television camera, for which purpose it is rotatably arranged in front of a light-integrating camera tube. The filter partly comprises sections which produce a reduction in definition and for this purpose are provided with a plurality of diffraction gratings having different spacings. The optical filter which owing to the provision of the diffraction gratings has a discontinuous light transmission characteristic, after integration of the light has a more or less continuous light transmission characteristic which corresponds in a desirable manner to an electric filter characteristic.
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申请公布号 |
US3794408(A) |
申请公布日期 |
1974.02.26 |
申请号 |
USD3794408 |
申请日期 |
1972.08.14 |
申请人 |
US PHILIPS CORP,US |
发明人 |
SING LIONG IAN,NL;HOFMAN J,NL;BOUWHUIS G,NL |
分类号 |
G02B5/20;H04N9/07;(IPC1-7):G02B5/18 |
主分类号 |
G02B5/20 |
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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