| 摘要 |
PURPOSE:To detect easily that the acceleration exceeds a prescribed value by making it possible that a pendulum is shaked in all directions in the horizontal plane and moving vertically a rod through a pushing-up plate which is shaked together with the pendulum as one body. CONSTITUTION:If the acceleration exceeding a prescribed value is applied to a weight 3 in any direction in the horizontal plane, the force with which the weight 3 is rotated around a fulcrum exceeds the pressing force from above, and the line connecting the fulcrum and the gravity center of the weight 3 is inclined from the vertical line. Then, a pushing-up plate 4 pushes up a rod 6 to cut off the optical axis between a light emitting element 9 and a photodetector 12, and the light of the light emitting element 9 does not reach the photodetector 12, and voltages in terminals 13 and 14 are approximately equal to an impressed voltage, and a potential difference does not exist between both ends of a voltmeter 21. |
