| 摘要 |
PURPOSE:To strengthen the titled acceleration sensor against impact and to make it possible to detect accelerations of a plurality of shafts by one acceleration sensor, by providing an outer hollow sphere, the inner sphere arranged in the outer sphere through a gap, the magnetic fluid sealed in the gap between the outer and inner spheres and a means for detecting the positions of the inner sphere in three axial directions. CONSTITUTION:In a non-accelerated state, an inner sphere 2 is held to the center position of an outer sphere 1 by a pair of detection rods 8 provided in each of X-axis, Y-axis and Z-axis directions. When acceleration is applied from the outside, if the specific gravity of the inner sphere 2 is larger in the magnitude relation between the specific gravity of the whole of the inner sphere 2 and that of a magnetic fluid, the inner sphere 2 is ready to replace to an acceleration direction and, if the specific gravity of the inner sphere 2 is smaller, the inner sphere 2 is ready to displace to the direction opposite to acceleration. The displacement of the inner sphere 2 at this time is detected by the detection rods 8 provided in X-axis, Y-axis and Z-axis directions and the resistance value of each potentiometer 9 is allowed to change. On the basis of this change, the feedback current corresponding to acceleration is supplied to the coil 17 of the electromagnet 14 provided in each of X-axis, Y-axis and Z-axis directions from a control means 13. |
