Ultrasonic wave amplifier and electronic device including the same

An electronic device comprising:

• an ultrasonic wave cell array comprising a plurality of ultrasonic wave cells;
• and
• a processor configured to control the plurality of ultrasonic wave cells,
• wherein each of the plurality of ultrasonic wave cells comprises:
• a transducer configured to generate sound waves;
• and
• a cavity structure configured to amplify the sound waves generated by the transducer,
• the cavity structure comprises:
• an input opening through which the sound waves generated by the transducer are input;
• an inner wall forming a cavity in which the sound waves input through the input opening resonate;
• and
• an output opening through which the amplified sound waves are output, and
• when a first axis is defined as a line connecting a center of the input opening and a center of the output opening, a shape of the inner wall is formed such that an area of the cavity in a cross section perpendicular to the first axis varies with a position on the first axis.

A cavity structure for amplifying and outputting input sound waves, the cavity structure comprising:

• an input opening through which sound waves are input;
• an inner wall forming a cavity in which the sound waves input through the input opening resonate;
• and
• an output opening through which the amplified sound waves are output,
• wherein, when a first axis is defined as a line connecting a center of the input opening and a center of the output opening, a shape of the inner wall is formed such that an area of the cavity in a cross section perpendicular to the first axis varies depending on a position on the first axis.