JPS6429776A - Acceleration detector - Google Patents

Abstract

PURPOSE:To obtain a detector which can be constituted in miniature at a low cost, by providing a movable body for moving in accordance with operated acceleration, in a case, and detecting a moving extent of this movable body by a magneto-sensitive element. CONSTITUTION:In a case 2 consisting of a non-magnetic material, a hole 3 is provided so as to be inclined at a prescribed angle against the horizontal plane. In this hole 3, a columnar magnet 4 is provided as a movable body, and a magnet 4 can roll or float in the inside. Also, in order to detect a generated magnetic field from the end face of the magnet 4, a magneto-sensitive element 5 is provided on a prescribed position opposed to an end part 3a of the upward side of the hole 3, and a detecting signal is outputted from the element 5. When a moving object is in a non-accelerated state, the magnet 4 is positioned at the lower side 3b of the hole 3 due to its dead weight, but when said object is accelerated in the direction as indicated with an arrow A, the magnet 4 moves to the upward side, namely, the element 5 side in the hole 3 in accordance with magnitude of the acceleration. In such a way, a magnetic field of the magnet 4 detected by the element 5 increases, therefore, from the detecting signal of the element 5, a moving extent of the magnet 4, namely, the acceleration of the moving object is known.