| 摘要 |
PROBLEM TO BE SOLVED: To provide an impact sensor which eliminates malfunctioning even under any impact received from the direction vertical (horizontal) to the direction of detecting acceleration and moreover, can reduce variations in the sensitivity of the sensor regardless of the direction of an impact even under any repeated impacts received in a prolonged use thereof. SOLUTION: In the case of the impact sensor, a magnetic lead switch 2 is installed concentrically within a hollow circle of a shaft 8, so that the center position between a pair of contacts 28a and 29b is arranged almost on the center axis regulating the hollow circle of the shaft 8 in the transverse direction as in the past. A hollow cylindrical permanent magnet 3', which is formed with the hollow circle eccentric to the center axis thereof, is so shaped as to have thick and thin parts integrally in the transverse direction and arranged on the outer circumferential surface of the shaft 8, so that the direction of the center of gravity existing at the thick part coincides with the direction of gravity thereof. Thus, the shaft 8 is made hard to vibrate even under any impact received from sideways, thereby being highly hindered from contacting the contacts 28a and 29a.
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