CN101247674A - Piezoelectric ceramic electro-acoustic conversion device - Google Patents
Piezoelectric ceramic electro-acoustic conversion device Download PDFInfo
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- CN101247674A CN101247674A CNA2008100197940A CN200810019794A CN101247674A CN 101247674 A CN101247674 A CN 101247674A CN A2008100197940 A CNA2008100197940 A CN A2008100197940A CN 200810019794 A CN200810019794 A CN 200810019794A CN 101247674 A CN101247674 A CN 101247674A
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Abstract
The invention provides a piezoelectric ceramics electron-phonon converter which comprises a vibrating board, a frame, a conductive path, also comprises a composite diaphragm composed of the vibrating board and a piezoelectric ceramics film, the vibrating board main-surface is bonded with first piezoelectric ceramics film, another surface is bonded with second piezoelectric ceramics film, two electrodes are fixed on same surface of the composite diaphragm respectively, namely first piezoelectric ceramics film; A region is set on first piezoelectric ceramics film, one electrode links with the A region which is non-conducting with other part of first piezoelectric ceramics film and is conducting with second piezoelectric ceramics film, another electrode is conducting with other part of first piezoelectric ceramics film except for A region. The minitype piezoelectric ceramics electron-phonon converter without cavity is ultra-thin and has less than 1mm thickness, about 1g weight, resonant frequency 1KHZ, wide frequency response range, clear and nature tone quality. The piezoelectric ceramics electron-phonon converter is suitable for mobile phone, wireless telephone, notebook computer, digital camera, blue-tooth earphone, MP3, MP4, PDA etc.
Description
Technical field
The present invention relates to a kind of piezoelectric ceramic electro-acoustic conversion, specifically, relate to a kind of miniature no cavity piezoelectric ceramic wideband electroacoustic transducer.
Background technology
Piezoelectric ceramic electro-acoustic conversion is the novel electron device that a kind of electroacoustic combines, also be modern production with life in the critical component of communicating by letter, applicable to digital product fields such as mobile phone, cordless telephone, notebook computer, digital camera, bluetooth earphone, MP3, MP4, PDA.The vibrating membrane of piezoelectric ceramic electro-acoustic conversion commonly used is by individual layer and double-deck piezoelectric ceramic film and the metal plate vibrating diaphragm is bonding constitutes, but needs the cavity of certain size to come sounding, belongs to the high-frequency electrical acoustical convertor.This electroacoustic transducer has high frequency characteristics, and its frequency band is narrow, and cavity and volume are big, has the shortcoming that low-frequency range can not sounding, and thickness is more than the 2mm usually, and weight is difficult to realize slimming greater than 2g, does not meet the requirement of portable electronic products slimmings such as mobile phone.
Chinese invention patent 200510077322.7 discloses a kind of " piezoelectric speaker ", and this loud speaker constitutes conductive path by two conductive metal foils on two interareas, can make the resonance frequency drift, and piezoelectric property is relatively poor, and volume is bigger.
Chinese invention patent 02154318.6 discloses a kind of piezoelectric speaker, and the vibrating diaphragm of piezoelectric ceramic is not a multilayer piezoelectric ceramic, and its frequency band is narrower, and structure is complicated, and volume is big, is difficult to adapt to the requirement of slimming.
China utility model patent 200520025618.x discloses a kind of " piezoelectric speaker ", and it belongs to the monolithic piezoelectric loud speaker, and its volume is bigger, is difficult to reach the requirement of slimming.
Summary of the invention
The technical problem to be solved in the present invention provides little, the lightweight miniature piezo-ceramic wideband of a kind of volume electroacoustic transducer.
Solve the problems of the technologies described above, a kind of piezoelectric ceramic electro-acoustic conversion of the present invention, involving vibrations plate, framework, has the conductive path of two electrodes, its innovative point is: also comprise the composite diaphragm of being made up of oscillating plate, first piezoelectric ceramic film, second piezoelectric ceramic film, described composite diaphragm is connected with frame fixation, the interarea of described oscillating plate bonding first piezoelectric ceramic film, its another side bonding second piezoelectric ceramic film, two electrodes of described conductive path are separately fixed on the same one side of composite diaphragm, promptly on first piezoelectric ceramic film.
As a kind of improvement of the present invention, described first piezoelectric ceramic film is provided with the a-quadrant, electrode is connected with a-quadrant on first piezoelectric ceramic film, the remainder not conducting mutually on the described a-quadrant and first piezoelectric ceramic film, and be conducted with second piezoelectric ceramic film.
As another kind of improvement the of the present invention, the remainder that another electrode and first piezoelectric ceramic film are removed beyond the a-quadrant is conducted;
As a further improvement on the present invention, described first piezoelectric ceramic film, second piezoelectric ceramic film are respectively multilayer piezoelectric ceramic.
Further improvement of the present invention is: the formula system of described first piezoelectric ceramic film, second piezoelectric ceramic film is niobium zinc-niobium nickel-lead titanate piezoelectric ceramics, adopts low-temperature sintering to make.
The present invention is because piezoelectric ceramic film is a multilayer piezoelectric ceramic, constituted the wideband electroacoustic transducer of no cavity, also adopt two electrodes to be separately fixed at structure on the same one side of composite diaphragm simultaneously, the resonance frequency of made piezoelectric ceramic electro-acoustic conversion is 1KHz, cut-off frequency is 15KHz, thickness is smaller or equal to 1mm, and weight is about 1g, reaches the requirement of slimming fully.
Description of drawings
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
Fig. 1 is the structural representation of a kind of piezoelectric ceramic electro-acoustic conversion of the present invention.
Fig. 2 is the B-B cutaway view of Fig. 1.
Embodiment
Referring to Fig. 1, a kind of piezoelectric ceramic electro-acoustic conversion, involving vibrations plate 1, framework 2, has electrode 5,6 conductive path, its innovative point is: also comprise by oscillating plate 1, piezoelectric ceramic film 3,4 composite diaphragms of forming, described composite diaphragm is fixedlyed connected with framework 2, the interarea of described oscillating plate 1 bonding piezoelectric ceramic film 3, constitute the one side of composite diaphragm, the another side of described oscillating plate 1 bonding piezoelectric ceramic film 4, constitute the another side of composite diaphragm, two electrodes 5 of described conductive path, 6 are separately fixed on the same one side of composite diaphragm, promptly are separately fixed on the piezoelectric ceramic film 3.
Illustrated by Fig. 1 and Fig. 2, described piezoelectric ceramic film 3 is provided with the a-quadrant, and described electrode 6 is connected with a-quadrant on the piezoelectric ceramic film 3, the remainder not conducting mutually on described a-quadrant and the piezoelectric ceramic film 3, and be conducted with piezoelectric ceramic film 4.
As seen from Figure 2, the remainder removed beyond the a-quadrant of described electrode 5 and piezoelectric ceramic film 3 is conducted.For reducing the influence to resonance frequency, suggestion is connected the end of electrode 5 in the center of circle of piezoelectric ceramic film 3.
Piezoelectric ceramic film 3,4 of the present invention is respectively multilayer piezoelectric ceramic; The formula system of described piezoelectric ceramic film 3,4 is niobium zinc-niobium nickel-lead titanate piezoelectric ceramics, adopts low-temperature sintering to make, and sintering temperature is 980～1030 ℃, need not seal sintering in sintering process, burn for spacious, binder removal and sintering are disposable to be finished, such prescription and sintering method thereof, work simplification, low-loss and energy-saving avoids producing the fluctuation of ceramic component and the composition of off-design, improved qualification rate, can suppress simultaneously the volatilization of lead oxide, compliance with environmental protection requirements, favourable health.
In prior art, the diameter of some oscillating plate is 10～50mm.In order to dwindle the volume of piezoelectric ceramic electro-acoustic conversion as far as possible, make it more become microminiaturized, the diameter of oscillating plate 1 of the present invention is 10～30mm, makes comparatively desirable with the stainless steel material of selecting the about 0.1mm of thickness for use.
Described electrode 5,6 adopts belt metal foil respectively, as Copper Foil.
Number of assembling steps of the present invention is:
The piezoelectric ceramic film 3 that at first prepares certain specification, 4, this piezoelectric ceramic film 3,4 is alternately laminated by piezoceramics layer and electrode layer multilayer respectively, low-temperature sintering is made, then with piezoelectric ceramic film 3,4 are bonded in respectively on the oscillating plate 1, solidify at a certain temperature and obtain composite diaphragm, composite diaphragm is fixed in the framework 2 again, then with electrode 5,6 are welded on respectively on the same one side of composite diaphragm, be on the piezoelectric ceramic film 3, described electrode 6 is welded on the a-quadrant, described electrode 5 is welded on the remainder beyond the a-quadrant removed of piezoelectric ceramic film 3, at last composite diaphragm is fixed in the framework 2.
Piezoelectric ceramic electro-acoustic conversion of the present invention is ultra-thin, in light weight, it is little to take up room, and when measuring distance was 1cm, acoustic pressure was more than or equal to 90dB, and its frequency response range is wide, the sound clarity nature.Be widely used in electronics or digital product fields such as mobile phone, cordless telephone, notebook computer, digital camera, bluetooth earphone, MP3, MP4, PDA.
Claims (7)
1, a kind of piezoelectric ceramic electro-acoustic conversion, involving vibrations plate (1), framework (2), has the conductive path of electrode (5,6), it is characterized in that: also comprise the composite diaphragm of forming by oscillating plate (1), piezoelectric ceramic film (3,4), described composite diaphragm is fixedlyed connected with framework (2), the interarea of described oscillating plate (1) bonding piezoelectric ceramic film (3), the another side of oscillating plate (1) bonding piezoelectric ceramic film (4), described electrode (5,6) is separately fixed on the same one side of composite diaphragm, promptly is separately fixed on the piezoelectric ceramic film (3).
2, piezoelectric ceramic electro-acoustic conversion according to claim 1, it is characterized in that: described piezoelectric ceramic film (3) is provided with the a-quadrant, described electrode (6) is connected with the a-quadrant, remainder not conducting mutually on described a-quadrant and the piezoelectric ceramic film (3), and be conducted with piezoelectric ceramic film (4).
3, piezoelectric ceramic electro-acoustic conversion according to claim 1 is characterized in that: described electrode (5) is removed a-quadrant remainder in addition with piezoelectric ceramic film (3) and is conducted.
4, piezoelectric ceramic electro-acoustic conversion according to claim 1 is characterized in that: described piezoelectric ceramic film (3,4) is respectively multilayer piezoelectric ceramic.
5, according to claim 1 or 4 described piezoelectric ceramic electro-acoustic conversions, it is characterized in that: the formula system of described piezoelectric ceramic film (3,4) is niobium zinc-niobium nickel-lead titanate piezoelectric ceramics, adopts low-temperature sintering to make.
6, piezoelectric ceramic electro-acoustic conversion according to claim 1 is characterized in that: the diameter of described oscillating plate (1) is 10～30mm.
7, piezoelectric ceramic electro-acoustic conversion according to claim 1 is characterized in that: described electrode (5,6) is respectively belt metal foil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100197940A CN101247674A (en) | 2008-03-17 | 2008-03-17 | Piezoelectric ceramic electro-acoustic conversion device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100197940A CN101247674A (en) | 2008-03-17 | 2008-03-17 | Piezoelectric ceramic electro-acoustic conversion device |
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| CN101247674A true CN101247674A (en) | 2008-08-20 |
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| CNA2008100197940A Pending CN101247674A (en) | 2008-03-17 | 2008-03-17 | Piezoelectric ceramic electro-acoustic conversion device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111770421A (en) * | 2020-06-30 | 2020-10-13 | 美特科技(苏州)有限公司 | Piezoelectric vibrating diaphragm and piezoelectric loudspeaker |
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2008
- 2008-03-17 CN CNA2008100197940A patent/CN101247674A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111770421A (en) * | 2020-06-30 | 2020-10-13 | 美特科技(苏州)有限公司 | Piezoelectric vibrating diaphragm and piezoelectric loudspeaker |
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Open date: 20080820 |