Patent ID: 7493818

Claim:
A bimorph-type acceleration sensor element, which is used for a bimorph-type acceleration sensor, comprising: a common supporter; a plurality of bimorph free vibrating sections having a cantilever beam structure, each of the free vibrating sections having a first portion that is in contact with the common supporter and a second portion that is not in contact with the common supporter; a main electrode on a top surface of each of said free vibrating sections; a further main electrode on a bottom surface of each of said free vibrating sections; a set of draw-out electrodes corresponding to each of said free vibrating sections and for drawing out electric charge from the vibrating sections, each respective draw-out electrode of the set of draw-out electrodes being electrically connected to a corresponding one of the main electrode or the further main electrode, the draw-out electrodes of each respective set being electrically isolated from each other, wherein: the second portion of a first one of the plurality of free vibrating sections extends from one edge of the common supporter and the second portion of a second one of the plurality of free vibrating sections extends from an opposite edge of the common supporter, the second portions of the first and second ones of the plurality of free vibrating sections defining a set of opposed second portions, and the first portion of the first one of the plurality of free vibrating sections is disposed in a first region adjacent to the one edge of the common supporter and the first portion of a second one of the plurality of free vibrating sections is disposed in a second region adjacent to the opposite edge of the common supporter, the first portions of the first and second ones of the plurality of free vibrating sections defining a set of opposed first portions such that opposed first portions are closer to each other than opposed second portions are closer to each other.