| 摘要 |
PURPOSE:To reduce the noise of delfection voltage and to improve the quality of picture, by performing main deflection of electron beam by a main deflecting electrode and performing correction of deflection such as circuit correction, etc. by an auxiliary deflecting electrode. CONSTITUTION:An output of vertical and horizontal sawtooth wave generating circuits 30, 31 is applied to main vertical and main horizontal deflecting electrodes 21, 23, 20, 22 by vertical and horizontal synchronizing pulses. At this time, the adjusted sawtooth wave voltage of vertical and horizontal period is applied to auxiliary horizontal and auxiliary vertical deflecting electrodes 25, 27, 26, 28 through horizontal and vertical deflection correcting circuit 35, 33. Accordingly, the electron beam is scanned normally by a deflection electric field generated by an electrode 24 after corrected by a deflection correcting electric field generated by an auxiliary deflecting electrode 29. Since deflection voltage is generated only in circuits 30, 31, an amplifier for overlapping correcting voltage becomes unnecessary, and the noise in the amplifier can be eliminated. |
