| 摘要 |
PURPOSE:To obtain a large CRT having excellent convergence characteristis, by connecting a pair of diodes, which are connected in parallel and with inverse polarities, in series with a vertical deflecting coil winding for controlling a saturable reactor, and then connecting a resistance in parallel with said connection. CONSTITUTION:A pair of diodes D1 and D2, which are connected in parallel and with inverse polarities, are connected in series with a vertical coil winding (inductance Ls and resistance R5), and then resistance R is connected in parallel with said connection. Regarding a silicon diode, current I rapidly rises from the point where voltage V is near 0.7 V. Therefore, current almost flows across the resistance During a vertical deflection current Iv is small. However, from the point where the voltage across paired diodes D1 and D2 becomes in excess of a rising voltage Vrise, the current starts to flow across the diodes and the vertical coil winding of a saturable reactor, so that the saturable reactor starts its operation. The relation R>Rs is suitable for enlarging a correction efficiency, and cross mis-convergence can be adjusted by making the resistance R variable.
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