Patent ID: 8678565

Claim:
An electromechanical transducer comprising: a plate including: (i) a pressurizing chamber, a cross section of which has substantially the same lengths in a first direction and a second direction, the first direction being on a plane parallel to the surface of the plate and the second direction being perpendicular to the first direction and on the plane, and (ii) a side-chamber arranged adjacent to the pressurizing chamber in a first direction and combined with the pressurizing chamber to form a space in the plate; a driven film formed on a surface of the plate, the driven film being thinner than the plate and covering the pressurizing chamber and the side-chamber; a lower electrode formed on the driven film; a driving member, having an outline smaller than the cross section of the pressurizing chamber in the direction parallel to the surface of the plate, in a first area opposite to the pressurizing chamber with respect to the lower electrode, including an operation section formed on the first area, and an extended section extended from the operation section to a second area opposite to the side-chamber with respect to the lower electrode; and an upper electrode formed on the driving member, wherein the length of the side-chamber in the second direction is smaller than the length of the pressurizing chamber in the second direction; and wherein the length of the extended section of the driving member in the second direction is smaller than the length of the side-chamber in the second direction.