JPS5515049A - Voltmeter - Google Patents

Abstract

PURPOSE: To make a vibration angle of a stylus sufficient even in case of voltage partial indication and simplify structure by setting the angle between tips of a yoke magnetic pole and a magnetic pole part to an angle of 15° to 30° at the center of the stylus axis when a rotary magnetic piece is in a stop position.

CONSTITUTION: Voltage value scales are indicated, for example, at every 30° in the left and the right at the center of [12] on character board 21, and this scale indicates 8 to 16 V within an angle range of 60°. Magnetic pole 23a of permanent magnet 23 is arranged in a horizontal position; and no voltage is applied to the ciol, magnetic pole parts 26b of movable magnetic piece 26 are sucked to magnetic pole 23a and are opposite to each other under it, and therefore, movable magnetic piece 26 is held at the stop position toward the horizontal direction. Stylus axis 27 is fixed freely rotatably to the center of diameter part 26a of movable magnetic piece 26, and stylus 28 is provided there. Yoke magnetic pole 29a is arranged in the vertical direction at approximately 90° for magnetic pole 23a. Then, they are so arranged that the angle between the tip of magnetic pole part 26b and magnetic pole 29a may be 20° in the rotation position of magnetic pole part 26b. Thus, the vibration angle of stylus 28 for voltage has an S-letter characteristic, and voltage partial indication is possible.

COPYRIGHT: (C)1980,JPO&Japio