| 摘要 |
PURPOSE:To enable to detect the index signal with high sensitivity, by increasing the plate voltage applied to the photoelectron multiplier than that at the intermediate period, at the initial and end period of horizontal, vertical or the composite of the both. CONSTITUTION:The plate voltage fed to the photoelectric conversion element 8 such as photoelectron multiplier provided outside of the light incoming window 7 of the beam index type color receiving tube is changed, the sensitivity of the photoelectric conversion element 8 is increased, the decreased light of incident amount of light is corrected, allowing to make the electric signal after photoelectric conversion constant with excellent condition. Accordingly, the beam index type color receiver sure in the operation can be realized. |
