The present invention has been that the technical configuration according to the focus unit of the FBT so as to seal the bleeder resistor inside the case of the focus unit is integrally provided to the FBT case a cover via a Extrusions is, one side of the FBT case 110 to volume with case 150, which the inner volume, the substrate 140 in the housing 130 of the focus unit 120 is integrally formed, block resistance case 170 is the leader resistor 160 is interpolated is provided respectively, the bleeder resistor 160 Extrusions 200 for a resistor fixed to the upper side is inserted, and in that the Extrusions 200 cover 220 via the insulating resin 210, the upper side is ever chakseol as a base.
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