| 摘要 |
PROBLEM TO BE SOLVED: To achieve an ideal circuit drive positioning by mounting a magnetic scale to either a reciprocating member or its fixed position and a magnetic displacement element to the other. SOLUTION: When a lever 6 rotates around a rotary shaft 5 of a lever 6, a lever operation tip 7 speedily reciprocates between a position where an object to be worked is located and a position away from it. A drive force required for the rotary movement of the lever 6 is given by a voice coil motor 1 and a thin-plate-shaped scale 2 is mounted to the lever 6. The scale 2 reciprocates relatively for a magnetic resistance element 3 when the lever 6 rotates around a rotary shaft 5. The magnetic resistance element 3 is mounted to a sensor holder 4, for example, by adhesion to read a scale for detecting a position being magnetically recorded at the scale 2, and the sensor holder 4 is mounted to other members for forming a fixing part, thus ideally detecting the amount of travel of the reciprocating operation of the scale 2 and the positioning.
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