Patent ID: 7501920

Claim:
A switch device comprising: a movable spring in a serpentine form, having bent portions and having an end as a fixed end; a substrate that is disposed below the movable spring; a first electrical contact point that is provided to the movable spring except the region of the fixed end; a second electrical contact point that is provided to the movable spring except the region of the fixed end, the first electrical contact point being located at a position farthest from the fixed end; a third electrical contact point that is provided onto the substrate and is located to face the first electrical contact point; and a fourth electrical contact point that is provided onto the substrate and is located to face the second electrical contact point, the switch device being put into an ON state when the first electrical contact point is brought into contact with the third contact point and the second electrical contact point is brought into contact with the fourth electrical contact point, the switch device being put into an OFF state when the first electrical contact point is separated from the third electrical contact point and the second electrical contact point is separated from the fourth electrical contact point.