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    • 7. 发明专利
    • SENSOR FOR DETECTING MOVING DIRECTION
    • JPH10288624A
    • 1998-10-27
    • JP9935097
    • 1997-04-16
    • YAMAHA MOTOR CO LTD
    • HAGIWARA TAKAHIDE
    • G01P13/02F15B15/28G01D5/14G01R33/02G01V3/08
    • PROBLEM TO BE SOLVED: To make it possible to detect the moving direction with the simple constitution by arranging a magnet so that both electrodes face a moving body on the moving line of the moving body, and detecting the residual magnetism generated by the movement of the moving body with a residual-magnetism detecting means provided at the center of both electrodes. SOLUTION: In this moving-direction detecting sensor 15, a permanent magnet 16, wherein a a Hall element 20 is provided at the central part in the inner space, is arranged so as to face a moving body 9 and both electrodes S and N on the moving line of the moving body 9. Under the stationary state of the moving body 9, the magnetic-flux density becomes 0 at the central part, to which the Hall element 20 faces, and the output signal from an amplifier circuit also becomes 0. When the moving body 9 relatively moves leftward (rightward) from this state, the magnetizing curve is relatively moved to rightward (leftward). The residual magnetism by hysterisis in this case is detected with the Hall element 20, and the specified voltage of +(-) is outputted and amplified with the amplifier circuit. Thus, the moving-direction signal is obtained and inputted by a controller. In this way, the moving direction of the moving body 9 can be detected with the simple structure.