To facilitate arrangement of a sensor by relaxing mounting accuracy on a magnet of the sensor which outputs a voltage, each time the magnetic field in a core, having a large Baukhausen effect, is inverted.
Two pairs of magnetic groups M1, M2 where magnets 1 to the number of 2n (n:a natural number) are circularly arranged respectively are provided, and magnetic poles of magnets at the shortest distance between the groups are arranged so as to attract each other; and each magnetic group M1, M2 is made to rotate mutually in synchronism in the reverse direction about the center axis. The sensor 2 is arranged so that its length direction is in parallel with a straight line, connecting the rotational axial centers of the magnetic groups M1, M2. A magnetic field change generated by rotating M1 and M2 in reverse is applied to the sensor, to thereby enable usage without problems, even if the mounting position between the sensor and the magnets is somewhat deviated.
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HAYASHI HITOSHI
AOKI HIROSHI
NOTO MASAHIRO
TOKYO GAS CO LTD
TAKENAKA SEISAKUSHO CO LTD
Yoshihide Komada
Kiyoshi Matsuzaki
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