Self-driven acoustic wave transducer

Abstract

The invention discloses a self-driven acoustic wave transducer, which is constructed by utilizing the frictional electricity property of a material and using a high-elasticity fastener. When acoustic wave is transferred to a first thin film layer of the transducer, the thin film layer makes corresponding mechanical vibration and outputs an electric signal through periodic contact with and separation from a second thin film layer. The electric signal is related to the frequency and the intensity of the acoustic wave, so that the acoustic wave transducer also has the function of a microphone. According to the acoustic wave transducer, the conversion from sound to the electric signal can be realized without supplying power through a power supply or charging previously; the acoustic wave transducer is a self-driven transducer; the self-driven acoustic wave transducer has extremely high sensitivity by using a high-elasticity thin film or a fine wire type fastener; and meanwhile, small, exquisite and concise structural design is adopted, so that the self-driven acoustic wave transducer is light and portable integrally and convenient to use, and has broad application prospect in production and life.

Description

technical field [0001] The invention relates to an acoustic wave transducer, in particular to a self-driven acoustic wave transducer based on friction power generation. Background technique [0002] An acoustic transducer is an acoustic-electric conversion device whose main function is to collect acoustic signals and convert them into electrical signals for analysis or transmission. One of the most typical applications is a microphone. From the replacement of microphones, we can understand the development of the field of acoustic wave transducers. At present, the microphones that have been reported have three different working mechanisms: respectively, dynamic microphones, condenser microphones and electret condenser microphones. Among them, the basic structure of a dynamic microphone includes three parts: a coil, a vibrating membrane and a permanent magnet. When sound waves enter the microphone, the vibrating membrane vibrates under the pressure of the sound waves, thereby...

AI Technical Summary

Problems solved by technology

However, the general electret microphone element has an internal electronic circuit to amplify the signal, so it still needs to be powered by a low voltage

[0003] It can be seen that the existing three kinds of acoustic wave transducers have their own shortcomings in the process of use: the transducers working with the moving coil mechanism have low sensitivity, poor high and low frequency response, and large volume, and the capacitive and electret transducers The device cannot work without an external power supply

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