Acoustic element and acoustic element integrated circuit

An acoustic device integrated circuit in which a plurality of cells in which a plurality of capacitive acoustic device are each distributed by a number of units are arranged in two dimensions on the same curved surface, wherein each of the plurality of cells distributed by a specific number of units is a transmission cell comprising:

• a plate-shaped first electrode base having a flat main surface;
• a plate-shaped second electrode base having a flat main surface parallel to and opposed to the first electrode base;
• a first electrode side convex portion provided on the first electrode base and having a first step side wall formed by a plane having an inclination angle inclined within 45° with respect to a vibration direction;
• a second electrode side convex portion provided on the second electrode base, at least a part of the second electrode side convex portion being opposed to the first electrode side convex portion so as to intersect with the first electrode side convex portion, the second electrode side convex portion having a second step side wall formed by a plane inclined at the same inclination angle as the first step side wall;
• and
• in each of the transmission cells, the first electrode base or the second electrode base vibrates in the vibration direction by a voltage applied between the first electrode base and the second electrode base to generate a capacitor at least a part of which depends on an electric line of force between the first step side wall and the second step side wall, and electrostatic energy in a vibration cavity sandwiched by the first electrode base and the second electrode base is increased.