| 摘要 |
<p>A sealed variable resistor is made by enclosing a variable resistor and an arm member attached to a shaft of the variable resistor in a sealing container, and rotatably supporting a dial knob on a shaft outside the sealing container such that when the dial knob is energized, the arm member moves in association by virtue of magnetic force. The reliability and operability of such a sealed variable resistor are improved by forming the arm member and dial knob into a circular plate, and attaching to the arm member and dial knob at least two magnet pairs separate from each other. These render the sealed variable resistor useful in various electrical devices which may be exposed to moisture when in use. <IMAGE></p> |
