Diaphragm perforating type piezoelectric flat speaker

A perforated, electric plate technology, applied in piezoelectric/electrostrictive transducers, sensors, electrical components, etc., can solve problems such as difficulties and restrict the popularization and application of piezoelectric speakers, and achieve improved flatness and better sound quality. Optimum, the effect of improving stiffness

Inactive Publication Date: 2011-06-29
KINGTONE INNOVATION BEIJING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moving the mid-frequency valley back often starts with the structure, size, etc., and the impact of structure, size and other parameters on the performance of the speaker is multifaceted. It is difficult to take care of other adjusted performance indicators while pushing the mid-frequency valley back. , it is often necessary to break the existing desi

Method used

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  • Diaphragm perforating type piezoelectric flat speaker
  • Diaphragm perforating type piezoelectric flat speaker
  • Diaphragm perforating type piezoelectric flat speaker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Figure 3(a) and Figure 3(b) are the front view and exploded view of Embodiment 1 of the present invention. The electrode 1 is divided into a positive electrode and a negative electrode, distributed on the upper surface and the lower surface of the piezoelectric ceramic sheet 2, the piezoelectric ceramic sheet 2 is pasted on the vibrating membrane 3, and the vibrating membrane 3 is restrained and fixed by the frame 4. The positive electrode lead 1a and the negative electrode lead 1b respectively lead the positive electrode and the negative electrode to corresponding solder points on the frame to facilitate connection to external circuits. The diaphragm 3 is made of nickel-iron alloy or stainless steel, and the layer thickness is controlled between 10 microns and 50 microns. A porous array 3a with 5 rectangular holes arranged in an "L" shape is distributed on each of the four corners of the rectangular diaphragm. , and is symmetrical to the center of the diaphragm. The p...

Embodiment 2

[0049] Figure 5(a) and Figure 5(b) are the front view and exploded view of Embodiment 2 of the present invention. Most of the structure of the piezoelectric speaker of this embodiment is the same as that of Embodiment 1. Only one "L"-shaped strip hole 3a is distributed at each of the four corners of the rectangular diaphragm, and is symmetrical to the center of the diaphragm. attached Figure 6 It is a comparison chart between the frequency response curve of Embodiment 2 of the present invention and the traditional frequency response curve. It can be seen from the figure that when the strip-shaped holes 3a in Embodiment 2 are used, the effect is basically the same as that of the porous array 3a in Embodiment 1, and the distortion in the mid-frequency band is improved, at least increasing the sound pressure level at the distortion place by 10db above. There is almost no change in the other frequency bands of the curve, which maintains the advantages of high sound pressure le...

Embodiment 3

[0051] Figure 7(a) and Figure 7(b) are the front view and exploded view of Embodiment 3 of the present invention. Most of the structure of the piezoelectric speaker of this embodiment is the same as that of Embodiment 1. Only one single hole 3a is distributed at each of the four corners of the rectangular diaphragm, and is symmetrical to the center of the diaphragm. attached Figure 8 It is a comparison chart between the frequency response curve of Embodiment 3 of the present invention and the traditional frequency response curve. It can be seen from the figure that the original mid-frequency distortion disappears, and even the concave curve at the original distortion becomes an upward convex curve, and the sound pressure level increases by more than 25db, which is equivalent to the increase of the voltage applied to the frequency band of the distortion by 16 times. sound pressure level effect. There is almost no change in the low frequency band of the curve, and slight jit...

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PUM

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Abstract

The invention belongs to the technical field of speakers, particularly relating to a thin piezoelectric speaker with a novel diaphragm structure. The structure of the speaker comprises a diaphragm, a piezoelectric ceramic wafer, an electrode, an electrode leading wire and a edge frame, wherein the piezoelectric ceramic wafer is adhered on the diaphragm; the electrode is arranged on the surface ofthe piezoelectric ceramic wafer; the electrode leading wire is connected with the electrode and an outer circuit; and the edge frame is used for restricting the diaphragm. The characteristics of the medium and low frequency section of the piezoelectric speaker are regulated through introducing single holes, single hole arrays, multiple holes, multiple hole arrays and porous symmetrical structureson the rectangular or round diaphragm, thus the distortion rate is reduced; the phase cancellation of medium-frequency range sound irradiation in space is lowered or eliminated; the evenness of the acoustic pressure level frequency response curve of the piezoelectric speaker is greatly improved; even if the acoustic pressure level at the distortion position is improved by above 25db, which is generated by the fact that the voltage applied on the frequency bandwidth of the distortion position is improved by 17 times, so that the sound quality of the piezoelectric speaker is better; and in addition, the rigidity and quality distribution of the diaphragm are improved, thus the output of the acoustic pressure of the speaker at the medium frequency range is obviously increased.

Description

technical field [0001] The invention relates to a novel piezoelectric loudspeaker, more specifically, to a piezoelectric flat-panel loudspeaker with a diaphragm perforated structure. Background technique [0002] The loudspeaker is an electric-force-acoustic transducer, which is an important component in audio equipment. Loudspeakers are widely used in people's daily life and bring a lot of convenience. In the fields of electronic products such as automobiles, radio, TV, speakers, mobile phones, MP4, computers, etc., the applications of loudspeakers can be seen almost everywhere. There are many types of loudspeakers, which can be divided into electric type (ie moving coil type), electrostatic type (ie capacitive type), electromagnetic type (ie reed type), piezoelectric type, etc. according to their energy conversion principles; Divided into woofers, midrange speakers, and tweeters, among which dynamic speakers are the most widely used. Due to its small size, thinness and l...

Claims

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Application Information

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IPC IPC(8): H04R17/00
CPCH04R17/00
Inventor 袁世明
Owner KINGTONE INNOVATION BEIJING TECH
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