| 摘要 |
PURPOSE:To optimize knocking voltage by connecting a knocking circuit to anode terminal of cathode ray tube and socket while constructing the mounting table with insulation member to reduce stray capacity of circuit thereby reducing the differential output voltage due to differential stray capacity of various cathode ray tubes by half. CONSTITUTION:Wiring 5 from a socket 3 of cathode ray tube 1 is connected through conducting board 15al, sliding member 17, and power supply rail 22 on an insulator 151 fixed on a supporting rod 13a while wiring 4 from anode terminal 2 is connected through conducting board 15a2, sliding member 16, power supply rail 21 and protective resistor 31 on an insulator 152 fixed on a supporting rod 13a to one end of output side coil of high voltage generator 30. Reinforced plastic is preferable as the insulation member for constructing the table 11. Consequently stray capacity such as ground capacity of spot knocking circuit can be reduced considerably, thereby even if plural kind of cathode ray tubes are operated simultaneously, spot knocking voltage will never drop nor go excessive. |
