Ultrasonic transducer and manufacturing method thereof

Abstract

The invention belongs to the technical field of transducers, and provides an ultrasonic transducer and a manufacturing method thereof. The ultrasonic transducer comprises a piezoelectric layer, a matching layer, a tuning layer and a backing layer. The piezoelectric layer is used for radiating ultrasonic wave signals forwards or backwards, and electrodes are plated on the two sides of the piezoelectric layer respectively. The matching layer is arranged at the front end of the piezoelectric layer and used for transmitting the ultrasonic wave signals radiated forwards. The tuning layer is arranged at the rear end of the piezoelectric layer located between the tuning layer and the matching layer. The backing layer is used for absorbing the ultrasonic wave signals radiated backwards by the piezoelectric layer and located on the side, deviating from the piezoelectric layer, of the tuning layer. Through arranging the tuning layer between the piezoelectric layer and the backing layer, the ultrasonic wave signals radiated backwards by the piezoelectric layer are effectively utilized, it is avoided that part of the ultrasonic wave signals enter the backing layer to be attenuated in a heat energy mode, meanwhile, the tuning layer is used for tuning pulse reverb of an ultrasonic probe, and therefore the time-domain response and frequency-domain response of the ultrasonic transducer are improved to a certain degree.

Description

technical field [0001] The invention belongs to the technical field of transducers, and in particular relates to an ultrasonic transducer and a manufacturing method of the ultrasonic transducer. Background technique [0002] Existing ultrasonic transducer structures such as figure 1 As shown, it mainly includes a piezoelectric layer 101, a matching layer 102, a backing layer 103 and an acoustic lens 104 (or an acoustic retarder). When an electric signal is applied to both ends of the piezoelectric layer 101, the piezoelectric vibrator generates vibration and sends to the The acoustic signal is radiated forward and backward, and the acoustic signal radiated forward passes through the matching layer 102 and the acoustic lens 104 (or acoustic delay film), and enters the detected object with a certain attenuation, while the acoustic signal radiated backward is mostly attenuated. The large backing layer 103 absorbs and wastes energy in the form of heat, so that the sound waves r...

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Problems solved by technology

[0008] The object of the present invention is to provide an ultrasonic transducer. By setting a tuning layer between the piezoelectric layer and the backing layer, it aims to solve the problem that the acoustic signal radiated backward by the ultrasonic transducer in the prior art cannot be fully utilized. question

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