High-voltage variable resistor

Abstract

A high-voltage variable resistor includes an insulating substrate having a surface on which there is formed a resistor including a variable resistor portion and a plurality of terminal electrodes including an output terminal electrode. A rotation shaft is included which is equipped with a sliding member adapted to slide on the variable resistor portion of the resistor when the rotation shaft is rotated. An insulating case rotationally supports the rotation shaft. The insulating substrate is disposed in the case such that the aforementioned surface is opposed to an inner bottom portion of the case. A capacitor connecting terminal is inserted through the insulating substrate and is electrically connected to the output terminal electrode. A connection terminal member is provided which has a spring portion electrically connected to the capacitor connecting terminal, and holding members for holding an output line inserted in the insulating case, wherein the connection terminal member connects the output terminal electrode to the output line without performing soldering. Finally, a capacitor is arranged on a back side of the insulating substrate and is connected to the capacitor connecting terminal. The above structure allows the high-voltage variable resistor to be formed reduced in size, and makes it possible to standardize the connection terminal member. Further aspects of the invention comprise a conductive rubber member for forming an electrical connection between the capacitor connecting terminal and the connection terminal member. In the another aspect of the invention, the capacitor connecting terminal has a fixation flange for attaching the capacitor connecting terminal with the substrate, and a contact flange for providing a contact surface for contact with the spring portion of the connection terminal member.