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An electro-acoustic transducer, piezoelectric technology, applied in piezoelectric/electrostrictive transducers, sensors, electrical components, etc., can solve the problems of increased distortion, sound pressure drop, loss, etc. Effect

Active Publication Date: 2018-05-22
IND TECH RES INST
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AI Technical Summary

Problems solved by technology

[0004] When the piezoelectric component is vibrated, the energy will be lost during the transmission from the piezoelectric component to the frame through the diaphragm and adhesive, resulting in a drop in sound pressure
In addition, the fixed frame of the piezoelectric horn is prone to resonance of the mechanical structure, resulting in uneven sound pressure output (or ripple; ripple), and when the piezoelectric horn has a resonance frequency, the sound pressure of the sound in the resonance frequency band Large; in the non-resonant frequency band, the sound pressure drops significantly, and the distortion increases accordingly
Excessive ripple and distortion of the sound pressure curve will cause unpleasant somatosensory effects

Method used

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Effect test

Embodiment 1

[0044] Embodiment 1, the piezoelectric electroacoustic transducer includes a diaphragm (85mm×42mm×0.1mm), a piezoelectric component (75mm×40mm×0.1mm) attached to the surface of the diaphragm, and is connected around the diaphragm An elastic component with multiple curved structures, a frame surrounding the elastic component, and a buffer body sandwiched between the elastic component and the frame. The distance between the plurality of curved structures is 10 mm, the height of each curved structure is 2 mm, the width is 0.5 mm, and the shape is arc-shaped. The ratio of the projected area of ​​the inner frame of the frame to the combined planar projected area of ​​the diaphragm, the elastic component and the buffer is 1 (that is, no compressive stress is applied). The test electrical parameter is 10Vrms, and the microphone receiving distance is 10cm. The sound pressure level (level) of embodiment 1 and the test result of total harmonic distortion are respectively as Figure 4A...

Embodiment 2

[0045] Embodiment 2: The difference from Embodiment 1 is that the width of the curved structure is 1 mm. The sound pressure level of embodiment 2 and the test result of total harmonic distortion are as Figure 4A and Figure 4B , Figure 5A and Figure 5B , Figure 6A and Figure 6B , Figure 7A and Figure 7B shown.

Embodiment 3

[0046] Embodiment 3: The difference from Embodiment 1 is that the width of the curved structure is 2mm. The sound pressure level of embodiment 3 and the test result of total harmonic distortion are respectively as Figure 4A and Figure 4B shown.

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Abstract

A piezoelectric electroacoustic transducer is disclosed. The piezoelectric electroacoustic transducer includes a diaphragm, a piezoelectric element disposed on the diaphragm, an elastic element connected with and around the diaphragm, a frame around the elastic element and being disassembled so as to adjust an inner-frame projected area of the frame, and a buffer interposed between the elastic element and the frame, wherein the frame has an inner-frame projected area less than a planar projected area of the diaphragm, the elastic element, and the buffer, such that the frame always provides a compressive stress to the diaphragm, the piezoelectric element, the elastic element, and the buffer. The piezoelectric electroacoustic transducer may be implemented as a loudspeaker or a microphone.

Description

technical field [0001] The invention relates to a transducer, in particular to a piezoelectric electroacoustic transducer. Background technique [0002] Piezoelectric speakers usually include a frame, a diaphragm fixed on the frame by adhesives, and a piezoelectric component attached to the diaphragm. The design principle is to use the conversion characteristics of mechanical energy and electrical energy of the piezoelectric component to drive the Next, the piezoelectric component is deformed to drive the diaphragm that is closely connected with it to compress the air to produce sound. [0003] Sound Pressure Level (SPL) and Total Harmonic Distortion (THD) are important characteristics of piezoelectric speakers. Among them, sound pressure refers to the vibration of air molecules when sound waves are transmitted in the air. The slight change of atmospheric pressure caused by it; and harmonic distortion refers to the interference on various multipliers of the original frequen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R17/00
CPCH04R7/20H04R17/00
Inventor 林家欣许清渊邱佑宗陈春弟
Owner IND TECH RES INST
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