| 摘要 |
PURPOSE:To decrease the kinds of power supplies and to reduce the power consumption for power adjustment, by connecting the 1st grid path and a deflection power supply circuit connected in parallel to a heater circuit of a pickup tube of an image pickup device, in series to the 1st reference power supply together with a constant current control circuit. CONSTITUTION:A regulated reference voltage Vcc=9V is obtained from the power supply of a video camera of the pickup device and applied to a heater H of the pickup tube, the rest is divided at resistors R1, R2 and applied to the 1st grid G1 as the 1st grid voltage. The circuit is connected in parallel with a deflection circuit current source AMP1 and a constant current control circuit comprising a transistor Q1 and a control amplifier. The kinds of power supplies for the pickup device are reduced, the power consumped for the voltage adjustment is suppressed to save the power of the device. |
