Micro sound frequency directional ultrasound energy converter array

An ultrasonic transducer array is composed of a plurality of transducer array units and is used for transmitting orientated ultrasonic wave and modulating the wave in air to generate audible sound. The transducer array includes conductive fixing plates (5 and 8) with electrodes; PVDF piezoelectric Ag-coated film (6) capable of vibrating to generate ultrasonic wave; array units fixing recess slot (7) providing vibration cavity for the piezoelectric film (6); and a piezoelectric film protecting plate (4) used for protecting the piezoelectric film and preventing the piezoelectric film from contacting outside and damage. The fixing plates (5 and 8) pass through an insulating support frame (9) and are connected with two terminals of an alternating current signal; the piezoelectric film (6) is pressed, fixed and supported by the fixing plate (5) and the recess slot (7), and the recess slot (7) is made of conductive metal and connects the negative electrode with the lower side of the piezoelectric film (6) by welding with the fixing plate (8). By applying a pretreated alternating current on two ends of the piezoelectric film (6), the transducer vibrates and emits orientated ultrasonic wave in a desired direction and generates audible sound indirectly.