Patent ID: 7703340

Claim:
A force sensor, comprising: a force sensor chip comprising a base member and a plurality of strain resistance elements; and an attenuator which is connected to a support portion and an action portion, and applies an input external force to the action portion by attenuating the input external force, wherein the base member comprises: the action portion to which the external force is applied through the attenuator, the support portion supporting the action portion, and a connection portion which connects the action portion and the support portion and deflects according to an applied external force, wherein the connection portion comprises: first bridging portions each of whose one end is connected to the support portion and extending in a first axis direction, a beam-like elastic portion whose both ends are connected to each of the other ends of the first bridging portions and extending in a second axis direction intersecting with the first axis direction, and a second bridging portion whose one end is connected to around a center of the beam-like elastic portion and extending in the first axis direction, wherein the plurality of strain resistance elements are arranged in the connection portion and detect the applied external force based on a deflection of the connection portion, wherein the strain resistance elements are disposed in an identical direction and within a same plane on at least the first bridging portions and the second bridging portion, and wherein the first bridging portions are formed separately and independently from other bridging portions.