发明名称 |
ND filter and television camera, and manufacturing method of ND filter |
摘要 |
<p>The present invention provides an ND filter and a television camera which can obtain a video with favorable quality which does not give sense of discomfort to viewers, and a manufacturing method of the ND filter. In an ND filter (10) of the present invention, a first region (34) with a light transmittance of about 100% and a second region (36) with a light transmittance continuously changing stepwise are continuously formed in a circumferential direction of a transparent glass board (32) formed in a disk shape. Therefore, image light transmits through all regions of the transparent glass board (32). Thereby, at the time of operation of light amount regulation, a region through which the image light does not transmit does not traverse a passage area (50) of the image light, and therefore, a screen does not become dark momentarily at the time of operation of light amount regulation. Therefore, by using the ND filter (10), a video with favorable quality without giving sense of discomfort to viewers can be obtained.</p> |
申请公布号 |
EP2241910(A2) |
申请公布日期 |
2010.10.20 |
申请号 |
EP20100159817 |
申请日期 |
2010.04.13 |
申请人 |
NIPPON HOSO KYOKAI;FUJINON CORPORATION |
发明人 |
MITSUHASHI, SEIJI;YAMAZAKI, JUNICHI;ODAWARA, KUNIHARU;SAITA, ARIHIRO;ISOZAKI, MAKOTO;OZAKI, TAKAO |
分类号 |
G02B5/20;G02B26/02 |
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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