Patent ID: 8459116

Claim:
A physical quantity sensor comprising: an anchor portion immovably supported; a movable portion displaceable in a height direction; a plurality of supporting portions each rotatably coupled to the anchor portion and to the movable portion; and a detection portion configured to detect displacement of the movable portion, wherein each supporting portion includes: a first connection arm extending from the anchor portion and connecting to the movable portion, configured to rotate in a first direction around a fulcrum joint provided between the anchor portion and the first connection arm; a leg portion extending from the anchor portion in a direction opposite to the first connection arm, configured to rotate around the fulcrum joint in a second direction opposite to the first direction, the leg portion restricting the displacement of the movable portion by moving in a direction opposite to a displacement direction of the movable portion when the supporting portion rotates and the movable portion is displaced in the height direction, and wherein the first connection arm of one of the supporting portions and the first connection arm of another of the supporting portions extend in opposite directions with respect to the anchor portion therebetween, and the leg portion of the one of the supporting portions and the leg portion of the another of the supporting portions extend in opposite directions with respect to the anchor portion therebetween.