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US5715103A Neutral density (ND) filter 失效
中性密度(ND)滤波器

Neutral density (ND) filter
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.
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