发明授权
- 专利标题: Neutral density (ND) filter
- 专利标题(中): 中性密度(ND)滤波器
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申请号: US651512申请日: 1996-05-22
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公开(公告)号: US5715103A公开(公告)日: 1998-02-03
- 发明人: Sayoko Amano , Mitsuharu Sawamura , Susumu Abe
- 申请人: Sayoko Amano , Mitsuharu Sawamura , Susumu Abe
- 申请人地址: JPX Tokyo
- 专利权人: Canon Kabushiki Kaisha
- 当前专利权人: Canon Kabushiki Kaisha
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX5-234098 19930826
- 主分类号: G02B5/28
- IPC分类号: G02B5/28 ; G02B1/11 ; G02B1/115 ; G02B5/00 ; G02B5/20 ; G02B5/22 ; G02B1/10
摘要:
A thin-film-type ND filter which attenuates the amount of light transmission is formed on a transparent substrate by using two or more types of metallic oxide having a refractive index n and an attenuation coefficient k which are in the range of 1.0 to 3.0 in the wavelength region of the visible region, making it possible to obtain flat transmittance characteristics.
公开/授权文献
- US4120612A Automatic pump for deep wells 公开/授权日:1978-10-17
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