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Piezoelectric speaker and drive amplifying system adopting same

A piezoelectric speaker and amplifying system technology, applied in the field of piezoelectric speakers, can solve problems such as distortion, and achieve the effect of reducing distortion and realizing flat characteristics.

Inactive Publication Date: 2011-05-11
SHENZHEN RUNZHI ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the embodiments of the present invention is to provide a piezoelectric speaker and a drive amplifier system using the piezoelectric speaker, aiming to solve the problem that the vibration response waveform of the piezoelectric speaker is relatively different from the input sound due to the open-loop adjustment of the common drive amplifier system. The problem that the waveform of the source signal produces great distortion

Method used

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  • Piezoelectric speaker and drive amplifying system adopting same
  • Piezoelectric speaker and drive amplifying system adopting same
  • Piezoelectric speaker and drive amplifying system adopting same

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Experimental program
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Embodiment 1

[0022] see figure 2 and image 3 , the piezoelectric speaker 106 provided by the embodiment of the present invention includes a metal substrate 101 and a piezoelectric ceramic sheet 102, the lower surface of the piezoelectric ceramic sheet 102 is bonded to the metal substrate 101 by conductive glue to form a flexible vibration A composite sheet, the upper surface of the piezoelectric ceramic sheet 102 is coated with a feedback electrode 104 made of conductive material, and the periphery of the feedback electrode 104 is provided with an insulating gap 105 that is not coated with conductive material, and the outer periphery of the insulating gap 105 corresponds to The upper surface of the piezoelectric ceramic sheet 102 is coated with a driving electrode 103 made of conductive material, and an insulating space 100 is left between the driving electrode 103 and the edge of the piezoelectric ceramic sheet 102 .

[0023] Wherein, the area of ​​the feedback electrode 104 is 1%-50% ...

Embodiment 2

[0039] see Figure 5 The difference between the piezoelectric speaker provided in Embodiment 2 of the present invention and Embodiment 1 is that the piezoelectric ceramics of the piezoelectric speaker provided in Embodiment 2 of the present invention adopts a multi-layer structure, that is, the piezoelectric speaker in Embodiment 1 Two interlayers are sandwiched between the piezoelectric ceramic sheet 102 and the metal substrate 101 of the microphone 106, and the two interlayer structures are the same, wherein the first interlayer includes: an interlayer piezoelectric ceramic sheet 501 bonded on the metal substrate 101 and a coating layer. An interlayer driving electrode 502 made of conductive material such as silver covers the entire upper surface of the interlayer piezoelectric ceramic sheet 501 . The second interlayer includes: an interlayer piezoelectric ceramic sheet 503 bonded to the interlayer driving electrode 502, and an interlayer driving electrode made of a conducti...

Embodiment 3

[0047] see Figure 6 The difference between the piezoelectric speaker provided by the third embodiment of the present invention and the first embodiment is that the metal substrate 601, and the piezoelectric ceramic sheet whose lower surface is bonded to the metal substrate 601, and on the piezoelectric ceramic sheet The surface is coated with a feedback electrode 604 made of a conductive material, an insulating gap 605 not coated with a conductive material is provided on the periphery of the feedback electrode 604, and the upper surface of the corresponding piezoelectric ceramic sheet is coated on the periphery of the insulating gap 605 The driving electrodes 603 made of conductive material are all triangular.

[0048] The driving and amplifying system of the piezoelectric speaker of the third embodiment of the present invention is different from the driving and amplifying system of the piezoelectric speaker of the first embodiment in that the shape of the piezoelectric speak...

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Abstract

The invention is applicable to the field of piezoelectric speakers and provides a piezoelectric speaker and a drive amplifying system adopting the same. The piezoelectric speaker comprises a metal substrate and a piezoceramic piece, the lower surface of the piezoceramic piece is bonded on the metal substrate to form a compound piece, a feedback electrode made of conductive material is coated on the upper surface of the piezoceramic piece, an insulating gap which is not coated with conductive material is arranged at the periphery of the feedback electrode, and a driving electrode made of conductive material is coated on the piezoceramic piece on the upper surface corresponding to the periphery of the insulating gap. In the piezoelectric speaker and the drive amplifying system adopting the same, the piezoelectric speaker and an audio output end form a full-closed loop negative feedback zero error regulating control, so that the distortion of the vibration response wave shape generated by the compound piece of the piezoelectric speaker relative to the sound source electrical signal wave shape outputted by the audio output end is greatly reduced, and the vibration response wave shape is kept straight within a certain frequency range.

Description

technical field [0001] The invention belongs to the field of piezoelectric speakers, in particular to a piezoelectric speaker and a drive amplification system using the piezoelectric speaker. Background technique [0002] At present, common drive amplifier systems adopt open-loop or partial closed-loop control, such as figure 1 As shown, only the closed-loop adjustment is used at the preamplifier, and then the electro-acoustic conversion is performed by the ordinary piezoelectric speaker after being amplified by the power amplifier. Due to the use of open-loop adjustment, the ordinary drive amplifier system cannot control the inherent bad frequency characteristics of the piezoelectric ceramic sheet in the piezoelectric speaker, resulting in a large distortion of the vibration response waveform of the piezoelectric speaker relative to the input sound source electrical signal waveform . Contents of the invention [0003] The purpose of the embodiments of the present invent...

Claims

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Application Information

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IPC IPC(8): H04R17/02H04R3/00
Inventor 李永红李薇柳汉震
Owner SHENZHEN RUNZHI ADVANCED TECH