| 摘要 |
PURPOSE:To remotely designate the movement of a movable electrode plate and record the movement, by changing lights reaching a photoreceptor body in accordance with the movement of the movable electrode plate by means of a light shielding plate fitted to a rotary shaft. CONSTITUTION:When a fixed electrode plate 1 is charged with electric charges, electric charges of the opposite code are produced in a movable electrode plate 2 and a shaft 3 is rotated by electrostatic attracting force acting between both electrode plates 1 and 2. Since a spiral spring 4 gives force resisting the rotation of the shaft 3 to the shaft 3, the movable electrode plate 2 stops at a position corresponding to the quantity of the electric charges given to the fixed electrode plate 1. As the shaft 3 rotates, a light shielding plate 7 is moved from the position shown by the chain line to the position shown by the solid line and a large quantity of lights is given to a solar battery 9, most part of the which is covered with the light shielding plate 7 when the voltage is ''0'', from a light emitting source 8. Therefore, the position of the movable electrode plate 2 can be known through an electric current flowing out from the solar battery 9 and an electrostatic voltage can be made to indicate.
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