Patent ID: 9678201
Date: 2017-06-13
CPC Classifications: B06B,G01S

Claim:
1. An ultrasonic transducer comprising: a substrate; and a plurality of capacitive ultrasonic cells arranged on an upper surface of the substrate in a predetermined direction, wherein thicknesses of cavities in the plurality of capacitive ultrasonic cells vary based on locations of the plurality of capacitive ultrasonic cells in the predetermined direction, and an upper surface of each of the plurality of capacitive ultrasonic cells corresponds to a flat surface, wherein each of the cavities in the plurality of capacitive ultrasonic cells has a lower surface and an uppers surface, the lower surface of each of the cavities being closer to the upper surface of the substrate in the predetermined direction than the upper surface of each of the cavities, and wherein lower surfaces of the cavities in the plurality of capacitive ultrasonic cells are at different levels from a lower surface of the substrate.