| 摘要 |
PURPOSE:To stabilize a white balance when radiant rays are exposed by providing a filter made of an anti-radiation glass which transmits the visible light having a wavelength range between the specific value and larger value to a color ITV containing a lens made of the anti-radiation glass. CONSTITUTION:Image pickup tubes 4-6 are provided to a color ITV camera, and a color separating optical system 3 is provided to these image pickup tubes. An anti-radiation lens 2 is set at the front of the system 3, and a filter 1 made of the anti-radiation glass which transmits the visible light having a wavelength range between the specific value and longer value is provided to the lens 2. The outputs of each color which are converted into electric signals by tubes 4-6 are amplified by preamplifiers 7-9, and the color components of each color are controlled to the same value by differential amplifiers 10-12 and applied to an encoder circuit 15 via process amplifiers 13-15. The specific wavelength of the filter 1 is set at 0.48mum. Thus a white balance is stabilized when the radiant rays are exposed.
|
