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ND FILTER, LIGHT QUANTITY DIAPHRAGM DEVICE, CAMERA EQUIPPED WITH LIGHT QUANTITY DIAPHRAGM DEVICE
ND FILTER, LIGHT QUANTITY DIAPHRAGM DEVICE, CAMERA EQUIPPED WITH LIGHT QUANTITY DIAPHRAGM DEVICE
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机译:ND滤光片,轻量膜片装置,配备有轻量膜片装置的相机
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摘要
PROBLEM TO BE SOLVED: To provide an ND filter and a light quantity diaphragm device capable of suppressing the deformation of a substrate due to the internal stress of the filter, capable of suppressing the transmission in a visible wavelength region, and also, capable of reducing the transmitted light quantity in a near infrared wavelength region, and to provide a camera equipped with the light quantity diaphragm device.;SOLUTION: A thin film 2 having characteristics of attenuating the transmission of a visible region is arranged on a substrate 1 having characteristics of suppressing the transmission of the light in the near-infrared wavelength region as compared with the transmission of the light in the visible wavelength region. In this case, the substrate can be constituted of an infrared cut glass and a resin infrared cut filter or the like, and the thin film can be constituted of a thin film having either of mono-density, multi-density, and gradation in terms of density distribution.;COPYRIGHT: (C)2006,JPO&NCIPI
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