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    • 2. 发明申请
    • Light Amount Control Apparatus and Camera Apparatus
    • 光量控制装置及相机装置
    • US20070263118A1
    • 2007-11-15
    • US10576395
    • 2004-10-07
    • Yutaka SatoHiroyuki TabelNobutaka Nakayama
    • Yutaka SatoHiroyuki TabelNobutaka Nakayama
    • G03B7/00H04N5/238
    • G02B5/22
    • The variation of shades due to light transmissivity controlled by a property device is suppressed with a simple structure. An optical device 1 that blocks light having a wavelength longer than a predetermined wavelength is disposed in a property device 20 that is composed of for example liquid crystal and that can control light transmissivity. The optical device 1 blocks light having a longer wavelength than a wavelength at which a wavelength band of which the wavelength dependency of spectrum characteristic of the property device 20 is weak changes to a wavelength band of which the wavelength dependency of spectrum characteristic of the property device 20 is strong. The optical device 1 blocks light having a longer wavelength than a predetermined wavelength emitted from an object. The property device 20 controls the light transmissivity and enters the light to an image sensor 3. The optical device 1 is capable of selectively entering light having a wavelength band whose spectrum characteristic is stable to the image sensor 3. Even if the light transmissivity of the property device 20 is varied, the color balance is kept nearly constant.
    • 通过简单的结构抑制由性能器件控制的光透射率引起的阴影变化。 将阻挡具有比规定波长长的波长的光的光学元件1设置在由例如液晶构成的能够控制透光性的特性元件20中。 光学装置1阻挡比特性装置20的光谱特性的波长依赖性的波长带弱的波长比波长长的波长的波长的波长带,其特性装置的频谱特性的波长依赖性 20强。 光学装置1阻挡具有比从物体发射的预定波长的波长更长的光。 属性装置20控制光透射率,并将光入射到图像传感器3。 光学装置1能够选择性地进入光谱特性对图像传感器3稳定的波长带的光。 即使特性装置20的透光率变化,颜色平衡保持几乎恒定。