This research is a resistance combination device installed in the focus device of FBT. Its technical composition is as follows:,On the back side of the focusing unit (1), the impedance fixing groove (2) is transverse,The two ends of the obstruction (3) are supported by fixed supports (4) (4),In the above two support articles (4), the body of blace resistance (3) is supported back and forth, and the combined resistance combination articles (5) are crossed with each other, with multiple settings.;Therefore, the resistance installed on the focus side not only firmly supports the fixation between the front and rear sides, but also prevents the flow and decline of blace resistance, The focusing shell and a certain distance can ensure enough insulation space, so as to improve the electrical characteristics.
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