Patent ID: 7490524

Claim:
A force sensor chip comprising: a base member to which an external force is applied, said base member including: an operating part provided in a central portion of said base member and having an external-force acting area section; a supporting part provided, in an outer peripheral portion of said base member, for supporting said operating part; an intermediate part provided from near between an outer periphery of said operating part and an inner peripheral portion of said supporting part; a first connecting arm section connecting said operating part and said intermediate part; and a second connecting arm section connecting said intermediate part and said supporting part; and at least one strain resistance element provided on each of respective deformation-generating portions of said first connecting arm section and said second connecting arm section, wherein the base member further comprises a first set of elongated holes forming an innermost substantially annular hole between the operating part and the intermediate part, and a second set of elongated holes forming an outermost substantially annular hole between the intermediate part and the supporting part, and wherein the first connecting arm section is disposed between adjacent elongated holes of the first set of elongated holes and the second connecting arm section is disposed between adjacent elongated holes of the second set of elongated holes.