| 摘要 |
An apparatus using a double focusing type fly-back transformer is disclosed. A top bleeder type is adopted in drawing the focus voltage of the fly-back transformer instead of the conventional neutral point type, and the double patterns of the focus resistors are separated from each other instead of the conventional common connections to the ground on the substrate FUB of the focus unit part. Further, one or more of the separately installed focus resistor patterns is used as a feedback line together with the bleeder resistor, thereby drastically reducing the size of the bleeder resistor. The anode voltage output terminal is connected to the initial voltage setting part 12 and the high voltage stabilizing circuit part 11, so that one or more of the patterned resistors of the focus unit part together with the bleeder resistor BR2 can share in serving as feedback lines. That is, first the high voltage which is supplied from the anode voltage output terminal HV to the anode terminal is divided by the bleeder resistor BR2, the first variable resistor VR21, the resistor R21 and the third variable resistor VR23. Thus the voltage dividing task is shared by other elements, and therefore, the size of the substrate of the bleeder resistor BR2 can be reduced, with the result that the manufacturing cost of the fly-back transformer is reduced.
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