| 摘要 |
PURPOSE:To realize simple structure, high reliability, and high density and to reduce errors due to temperature variation by providing a permanent magnet, alternating magnetic field generating means, and a magnetic detecting means, etc. CONSTITUTION:An alternating magnetic field is generated at right angles to a magnetic field established by the permanent magnet 2 by the excitation of a coil 6, and attractive force and resiliency operates alternately on the magnet 2. Consequently, the friction to the contact surface between the magnet 2 and a storage chamber 1a is only dynamic friction and when inertial force by acceleration operates, displacement in the direction is easy to occur. Then, the position of a magnet holding member 8 is adjusted to position the magnet 2 laterally. At this time, the ratio of right and left speed detection is normally equalized, so the position of the member 8 is adjusted so that the magnet 2 is in the center of the storage chamber 1a. In such a state, when detection signals detected by magneto-resistance elements 4 and 4 are regarded as references, the magnet 2 moves in proportional to the acceleration in the acceleration, so signals proportional to the movement extents are obtained from the detecting elements 4 and 4 and the acceleration is known from the differences from the references.
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