| 摘要 |
PURPOSE:To make angle of an indicating surface of an indicating board, by arranging a movable yoke to a fixed yoke in such a way that magnetic connection is almost unchangeable for swinging and installing an electromagnetic movable body mounted with the indicating board on the movable yoke. CONSTITUTION:A movable yoke consisting of side yokes 11a, 11b and the main yoke 18 is installed free to swing with respect to a fixed yoke 8 wound with a coil 10. Here, upon performing the swinging motion, electromagnetic connection is adjusted almost unchangeable. On the main yoke 18, a 2-pole cylindrical permanent magnet 27, representing an electromagnetic movable body, is mounted. A rotary indicating board 29 is brought to a swinging motion by a magnet 27 swinging with a parameter of an electric current flowing in the coil 10 to indicate a measured value. An angle of the indicating surface of the board 29 is made changeable by swinging the movable yoke by an external force.
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