| 摘要 |
PURPOSE:To simply constitute a seismoscopic device by providing a cross-shaped slit part whose interval is narrowed gradually extending from the center part to the tip, on a printed board, and rolling a conductive sphere along this part. CONSTITUTION:A conductive sphere 12 which has a cross-shaped slit part 11 which is formed together with pattern copper foils 9, 10, and whose interval is narrowed gradually extending from the center part to the tip, and placed so as to be freely rollable, and also, stably to a prescribed seismic intensity or a prescribed inclination angle in this slit, and forms a contact against the pattern copper foils 9, 10 by rolling when a vibration is provided on a printed board 8. When a vibration exceeding a prescribed value is subjected, the conductive sphere 12 is detached from the center of the slit part 11 as shown by a one point chain line, forms a contact 13 with a part of the pattern copper foils 9, 10 of the slit part 11, and goes to a shorted state. When the vibration is continued, the conductive sphere 12 rolls along the slit part 11, and the pattern copper foils 9, 10 repeat open and short states, and its signal is used as a vibration detecting signal.
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