| 摘要 |
PURPOSE:To make the configuration very compact and to obtain excellent characteristics without erroneous operation by discriminating earthquake and vibrations different from the earthquake, by utilizing a small amount of a mercury particle as an inertial mass body. CONSTITUTION:A pot 20 has a central recess comprising a wall surface 22, which is approximately perpendicular to a bottom surface 21, at the central part of the bottom part. At the outer periphery of a bottom part 23, whose gradient is as low as a horizontal plane, a bottom part 24, whose gradient is high, is provided. An electrode 50 is made to pierce a through hole 31, which is formed at the center of a lid plate 30, and sealed and fixed by an electric insulating material in an airtight manner. With a lower surface 71 of a housing 70 as a horizontal perference plane, an airtight container is attached. When the earthquake sensor responds to earthquake, a mercury particle 10 is moved, a contact point is opened, and an electric signal is outputted to an outside circuit by a contact piece 60, which is connected to the electrode 50 and the lid plate 30. The thickness of a lower end 51 of the electrode is selected so that it is less than 1/10 the lateral diameter of the mercury particle. Then the mercury particle can be positioned at the center of the pot 20 by the gravity.
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