Patent ID: 8791380

Claim:
An acceleration switch comprising: a first substrate including first and second through electrodes each having one end for electrical connection to an external circuit; a second substrate laminated to the first substrate, the second substrate including a mass body having a space, an single arc-shaped beam supporting the mass body, a support portion supporting the arc-shaped beam and being electrically connected to another end of one of the first and second through electrodes, and a counter electrode disposed in the space of the mass body and being electrically connected to another end of one of the other of the first and second through electrodes, an electrode interval corresponding to a distance between an inner side surface of the mass body and an outer side surface of the counter electrode being in the range of 1 μm to 20 μm; and a third substrate laminated to the second substrate; wherein the arc-shaped beam is configured to warp when an inertia force resulting from acceleration received by the acceleration switch is applied to the mass body.