| 摘要 |
PURPOSE:To eliminate the need for periodic cleaning operation by allowing oscillations of an ultrasonic oscillator to operate on a corona discharge line or grid line. CONSTITUTION:A shield plate 10 which has U-shaped cross section, insulating support bases 11 provided integrally to both its end parts, the ultrasonic oscillator 12 fitted to one insulating support base 11, and a connector 13 for external electric path connection to the other insulating support base 11 are provided in one body respectively. One terminal is fitted to the insulating base by a fixing pin 15, and the other terminal is fitted to the connector 13 while pressed against the ultrasonic oscillator 12 through an insulating member 16 to extend the corona discharge line 14 between the left and right insulating support bases 1, and the discharge line 14 is oscillated by the vibrator 12 in a diameter direction. Oscillation circuits 18a and 18b which differ in oscillation frequency and peak value of oscillation output are connected to the ultrasonic vibrator 12, and the oscillation circuits 18a and 18b and a high voltage transformer 19 are controlled by a timing signal circuit 20. |
