| 摘要 |
PURPOSE:To supply a normal heater voltage from a power supply for operating the circuit by obtaining the heater circuit for the image pickup tube having a different heater voltage in a multi-tube type color TV camera from a DC power supply and plural DC constant voltage devices. CONSTITUTION:A DC power supply DPS outputs a voltage value V being nearly (V1+V2+...+Vn) with respect to heater voltages V1, V2...Vn in image pickup tubes PT1-PTn. The voltage value V is fed to the 1st DC constant voltage VRC1, and a difference output V1 between the output (V2+V3+...+Vn) of the 1st DC constant voltage device VRC1 and the input voltage V is obtained as the rated voltage of the heater of the image pickup tube PT1. A heater rated voltage V2 of the image pickup tube PT2 is obtained similarly from the 2nd DC constant voltage device VRC2 and then the heater rated voltages up to the image pickup tube PTn are obtained. Then even if the power supply for operating the circuit having a different voltage from the heater voltage of the image pickup tube is used, the normal heater voltage is supplied easily in this way.
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