Electro-acoustic actuator and method for manufacture

Abstract

The invention relates to an electric-sound activator and relative production, used in sound amplifier, wherein the activator receives two common-phase / reverse alternative voice voltages from sound amplifier to generate sound; and the invention comprises a film vibrator, two conductive back plates and two insulators. Its production comprises that: forming film vibrator, charging two side faces of vibrator, setting two insulators at two sides of vibrator and setting the back plates at two sides of insulators. The invention can save energy and reduce cost.

Description

technical field [0001] The present invention relates to an electroacoustic actuator and its manufacturing method, in particular to an electroacoustic actuator which is applied in an audio amplifier and is provided with a plurality of nanometer holes, and has an electret material composition and the electroacoustic actuator. method. Background technique [0002] Today's loudspeakers are mainly divided into three types according to the driving method: dynamic, piezoelectric and electrostatic; among them, the dynamic loudspeaker is currently the most widely used and the technology is relatively mature. Its main driving principle is based on Fleming ( Fleming's left-hand rule, using the interaction of magnetic field, current and force at right angles to control the repeated movement of the vibrating membrane piston; but at present, dynamic speakers are widely used in various TVs, audio, headphones and mobile phones , because of its fixed structure, the size cannot be reduced, m...

AI Technical Summary

Problems solved by technology

[0002] Today's loudspeakers are mainly divided into three types according to the driving method: dynamic, piezoelectric and electrostatic; among them, the dynamic loudspeaker is currently the most widely used and the technology is relatively mature. Its main driving principle is based on Fleming ( Fleming's left-hand rule, using the interaction of magnetic field, current and force at right angles to control the repeated movement of the vibrating membrane piston; but at present, dynamic speakers are widely used in various TVs, audio, headphones and mobile phones , because of its fixed structure, the volume cannot be reduced, making it unable to meet the needs of future 3C products for volume flattening

[0003] Piezoelectric speakers use the piezoelectric effect of piezoelectric materials. When an electric field is added to the piezoelectric material in the piezoelectric speaker, the piezoelectric material will be deformed, thereby pushing the diaphragm to sound; although this piezoelectric The speaker structure is flat and miniaturized, but due to the high resonance frequency required by the piezoelectric material and the insufficient bandwidth available, the current applicable fields are limited, and most of them are used in sirens

[0004] The working principle of the electrostatic speaker is to clamp a conductive diaphragm between two electrode plates with openings to form a structure similar to a capacitor, and then give the two electrodes a DC bias by giving the conductive diaphragm a DC bias. The positive and negative phase AC voltage is synchronized on the board, and the electrostatic force generated by the positive and negative charges drives the conductive diaphragm and radiates the sound. The conductive diaphragm used in this electrostatic speaker is extremely thin, with fast instantaneous response and high resolution. The advantages of low distortion and no electromagnetic influence make it play an important role in the field of loudspeakers. However, since the bias voltage for the conductive diaphragm needs to reach hundreds to thousands of volts (Volt), it requires high external unit price and bulky volume. The amplifier can only be used, so it cannot be popularized

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