CN201207728Y - Piezoelectric ceramics electroacoustic transducer - Google Patents
Piezoelectric ceramics electroacoustic transducer Download PDFInfo
- Publication number
- CN201207728Y CN201207728Y CNU2008200329856U CN200820032985U CN201207728Y CN 201207728 Y CN201207728 Y CN 201207728Y CN U2008200329856 U CNU2008200329856 U CN U2008200329856U CN 200820032985 U CN200820032985 U CN 200820032985U CN 201207728 Y CN201207728 Y CN 201207728Y
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- piezoelectric ceramic
- film
- piezoelectric ceramics
- ceramic film
- electrode
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- 239000000919 ceramic Substances 0.000 title claims abstract description 77
- 238000006243 chemical reaction Methods 0.000 claims description 18
- 239000002131 composite material Substances 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000011888 foil Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 abstract 2
- 238000005516 engineering process Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 238000009766 low-temperature sintering Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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Abstract
Disclosed is a piezoelectric ceramics electroacoustical converter which comprises a vibration plate, a frame, a conductive loop, and a compound vibration film composed of the vibration plate and a piezoelectric ceramics film. The main surface of the vibration plate is glued with a first piezoelectric ceramics film, and the other side is glued with a secondary piezoelectric ceramics film. Two electrodes are respectively fixed on the same surface of the compound vibration film, namely, the first piezoelectric ceramic film. The first piezoelectric ceramics film is provided with an A area, which is connected with an electrode. The A area is not conducted with the other parts of the first piezoelectric ceramics film, and is conducted with the secondary piezoelectric ceramics film. The other electrode is conducted with the other parts except the A area of the first piezoelectric ceramics film. The minitype non-cavity type piezoelectric ceramics electroacoustical converter is ultra thin, the frequency response range is broad, the sound effect is distinct and natural, the resonant frequency is 1 KHz, the thickness is no more than 1 mm and the weight is around 1g. The converter is applied to the fields of the mobile phone, wireless phone, lap-top computer, digital camera, blue-tooth earphone, MP3, MP4 and PDA.
Description
Technical field
The utility model relates to a kind of piezoelectric ceramic electro-acoustic conversion, specifically, relates 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 problems to be solved in the utility model 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 utility model, 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 utility model, 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 utility model, the remainder that another electrode and first piezoelectric ceramic film are removed beyond the a-quadrant is conducted;
As further improvement of the utility model, described first piezoelectric ceramic film, second piezoelectric ceramic film are respectively multilayer piezoelectric ceramic.
The utility model 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 embodiment of the present utility model is described in further detail.
Fig. 1 is the structural representation of a kind of piezoelectric ceramic electro-acoustic conversion of the present utility model.
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 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 described in the utility model is respectively multilayer piezoelectric ceramic, respectively by piezoceramics layer with the electrode layer multilayer is alternately laminated forms, wideband electroacoustic transducer with oscillating plate 1, the no cavity of framework 2 formations, overcome that individual layer piezoelectric ceramic film frequency band is narrow, cavity is big, bulky defective, so meet the requirement of slimming.
In prior art, the oscillating plate volume of some piezoelectric ceramic electro-acoustic conversion is bigger, and its diameter 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 utility model 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.
The number of assembling steps of piezoelectric ceramic electro-acoustic conversion of the present utility model is:
The piezoelectric ceramic film 3 that at first prepares certain specification, 4, this piezoelectric ceramic film 3,4 respectively by piezoceramics layer with the electrode layer multilayer is alternately laminated makes, to adopt low-temperature sintering comparatively desirable, its sintering temperature is 980～1030 ℃, then with piezoelectric ceramic film 3,4 are bonded in respectively on the oscillating plate 1, solidify at a certain temperature and constitute 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 utility model 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 (6)
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, piezoelectric ceramic electro-acoustic conversion according to claim 1 is characterized in that: the diameter of described oscillating plate (1) is 10～30mm.
6, 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 |
|---|---|---|---|
| CNU2008200329856U CN201207728Y (en) | 2008-03-17 | 2008-03-17 | Piezoelectric ceramics electroacoustic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200329856U CN201207728Y (en) | 2008-03-17 | 2008-03-17 | Piezoelectric ceramics electroacoustic transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201207728Y true CN201207728Y (en) | 2009-03-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200329856U Expired - Fee Related CN201207728Y (en) | 2008-03-17 | 2008-03-17 | Piezoelectric ceramics electroacoustic transducer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201207728Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI637639B (en) * | 2017-02-14 | 2018-10-01 | 英屬開曼群島商智動全球股份有限公司 | Electro-acoustic transducer |
-
2008
- 2008-03-17 CN CNU2008200329856U patent/CN201207728Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI637639B (en) * | 2017-02-14 | 2018-10-01 | 英屬開曼群島商智動全球股份有限公司 | Electro-acoustic transducer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090311 Termination date: 20140317 |