| 摘要 |
An impact detector includes a weight having a circular periphery, a case in which the weight is contained, an interior of which defines a transition path that connects an initial position and an impact detection position, and a restriction portion projecting from the interior of the case into the transition path. The weight moves through the transition path to the impact detection position with a circumferential surface of the weight in contact with the interior of the case when the case receives an impact in a predetermined direction, and the restriction portion restricts movement of the weight toward the impact detection position when the case receives impact in a direction other than the predetermined direction.
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