CN201467436U - Piezoelectric loudspeaker adopting novel constraint form - Google Patents
Piezoelectric loudspeaker adopting novel constraint form Download PDFInfo
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- CN201467436U CN201467436U CN200920110607XU CN200920110607U CN201467436U CN 201467436 U CN201467436 U CN 201467436U CN 200920110607X U CN200920110607X U CN 200920110607XU CN 200920110607 U CN200920110607 U CN 200920110607U CN 201467436 U CN201467436 U CN 201467436U
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- piezoelectric ceramic
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Abstract
The utility model belongs to the technical field of loudspeakers and in particular relates to a piezoelectric loudspeaker adopting the novel constraint form. A constrain element constrains one or more non-edge points on a diaphragm or constrains one or more non-edge points on the non-contact surfaces between piezoelectric ceramic wafers and the diaphragm. The piezoelectric loudspeaker of the utility model adopts the form of middle solder joint fixation, gets rid of the external frame structures of the traditional loudspeakers and gets rid of the boundary support conditions between the diaphragm and the external frame. The manufacturing cost of the loudspeaker is greatly lowered while the low-frequency resonance characteristics of the traditional piezoelectric loudspeakers are improved, the installation is more convenient and other small-size electronic components can be embedded below the back cavity of the loudspeaker, thus saving the space.
Description
Technical field
The utility model belongs to the loudspeaker techniques field, particularly a kind of piezoelectric speaker that adopts novel the way of restraint.
Background technology
Piezoelectric speaker has little, thin, light characteristics with respect to traditional coil-moving speaker, under the trend of current device miniaturization, has extremely bright prospect and future.
The performance of piezoelectric speaker can obtain by the sound pressure level curve (logarithmic curve of acoustic pressure-frequency) of measuring element, and wherein have several important index to require: the resonance frequency of the first rank flexural vibrations is low as far as possible, ensures that loud speaker low frequency tonequality is good; When loading same voltage, the sound pressure level curve is high as far as possible, ensures the speaker volume height; Acoustic pressure-frequency curve is mild as far as possible, fluctuation is little, ensures that the high bass tonequality of loud speaker is all good.
Compare with traditional moving-coil speaker, piezoelectric speaker has following some advantage: do not need magnet in (1) structure, and noiseless; (2) thin thickness can be installed on more in the narrow space; (3) weight is little, than the light 50%-80% of traditional moving-coil speaker; (4) low in energy consumption, be generally less than 15mW, prolonged the battery life of device greatly; (5) acoustic design is simple, and the back side only needs little room, need be for the necessary cavity that is used to improve sound pressure level of moving-coil speaker.
Possessing very big advantage than conventional loudspeakers when, also there are some shortcomings in common piezoelectric speaker.For example, the piezoelectric speaker first rank resonance frequency is higher, and low frequency characteristic is poor slightly.Mainly the size with piezoelectric ceramic is relevant with the way of restraint for this.The piezoelectric ceramic of the piezoelectric speaker that has occurred at present adopts frame to prop up (three one-movement-freedom-degrees at constraint piezoelectric ceramic piece edge), freely-supported modes such as (only retraining an one-movement-freedom-degree of potsherd thickness direction) admittedly more.But it is not just high for original cost, profit, the piezoelectric speaker that volume is very little, frame can increase cost undoubtedly greatly, take up room, and utilize frame constraint vibrating diaphragm that the natural frequency of vibrating diaphragm is had certain influence, and then influence the performance index of piezoelectric speaker.
Summary of the invention
The purpose of this utility model provides a kind of novel fixed constraint mode that has, make the piezoelectric speaker that resonance frequency reduces, low frequency characteristic improves, comprise vibrating diaphragm, be bonded in the piezoelectric ceramic piece on the vibrating diaphragm, the electrode on potsherd surface, the confinement element of constraint vibrating diaphragm or piezoelectric ceramic piece is characterized in that, the normal direction degree of freedom or three quadrature one-movement-freedom-degrees of one or more of a non-edge of confinement element constraint vibrating diaphragm.
Described confinement element constraint one or two non-edge of vibrating diaphragm and acentric one or more.
One or more of non-edge on described confinement element constraint piezoelectric ceramic piece and the non-contacting surface of vibrating diaphragm.
Described piezoelectric ceramic piece is square or circular.
Described vibrating diaphragm is square or circular.
The beneficial effects of the utility model are: brave some fixed form in the middle of this novel piezoelectric loud speaker adopts, removed the frame structure of conventional loudspeakers, removed the border supporting condition between vibrating diaphragm and the housing, when improving the low-frequency resonant characteristic of conventional piezoelectric loud speaker, greatly reduced the manufacturing cost of loud speaker, install more conveniently, and other small size electronic devices and components can be embedded in below the loud speaker back of the body chamber, have saved the space.
Description of drawings
Fig. 1 a is the front view of the utility model embodiment 1;
Fig. 1 b is the vertical view of the utility model embodiment 1;
Fig. 1 c is the axis side view that waits of the utility model embodiment 1;
The sound pressure level curve ratio that Fig. 2 props up constraint admittedly for center constraint and four limits;
Fig. 3 is the vertical view of the utility model embodiment 2;
Fig. 4 is the vertical view of the utility model embodiment 3;
Fig. 5 is the vertical view of the utility model embodiment 4;
Fig. 6 a is the front view of the utility model embodiment 5;
Fig. 6 b is the vertical view of the utility model embodiment 5.
Number in the figure:
The 1a-positive electrode; The 1b-negative electrode; The 2-piezoelectric ceramic piece; The 3-vibrating diaphragm; The 4-confinement element.
Embodiment
The utility model provides a kind of piezoelectric speaker that adopts novel the way of restraint, below by description of drawings and embodiment the utility model is described further.
Embodiment 1:
Among the embodiment 1, positive electrode 1a and negative electrode 1b are silver, be plated on the upper and lower surface of piezoelectric ceramic piece 2 respectively, and the lower surface of potsherd 2 are bonded in the upper surface of vibrating diaphragm 3, vibrating diaphragm 3 by the confinement element 4 at its middle part, bottom surface with the welding manner fixed constraint.
In embodiment 1 of the present utility model (Fig. 1 a to Fig. 1 c), square individual layer piezoelectric ceramic piece 2 is of a size of 18mm * 18mm * 0.12mm (length * wide * thickness), square stainless steel vibrating diaphragm 3 is of a size of 23mm * 23mm * 0.08mm (length * wide * thickness), vibrating diaphragm 3 lower surface center freely-supporteds, piezoelectric ceramic piece 2 upper and lower surfaces scribble the face electrode, upper surface add the 5V swept-frequency signal (0～12000HZ), lower surface ground connection.Utilize ANSYS emulation, obtain apart from vibrating diaphragm 3 lower surface center method and be the sound pressure level data at 31.6mm place to distance, drawing and contrast in MATLAB with the sound pressure level data of other several same sizes and voltage condition, as shown in Figure 2.
As can be seen from Figure 2, the resonance frequency that the resonance frequency of embodiment 1 of the present utility model is compared under the simply supported on four sides situation reduces about 100HZ, only is about 1100HZ.And that the sound pressure level of this embodiment and the sound pressure level under the corresponding simply supported on four sides restraint condition are compared difference is little.In addition, it can also be seen that from Fig. 2 that in small range, middle freely-supported area is big more, sound pressure level is high more, but amplitude of variation is little.And under the situation of centre constraint, freely-supported and solid propping up to almost not influence of sound pressure level.More than these analyses practical application is had important directive function, and can draw the resonance frequency that the utility model can reduce piezoelectric speaker really, simultaneously sound pressure level is not had the conclusion of big influence.
Embodiment 2:
The special feature of embodiment 2 is that two square piezoelectric ceramic pieces 2 are bonded in the upper and lower surface of vibrating diaphragm 3 respectively, and the center of arbitrary piezoelectric ceramic piece 2 of confinement element 4 constraints and vibrating diaphragm 3 noncontact faces.The structure of two piezoelectric ceramic pieces 2 and surface electrode thereof are identical with embodiment 1, and structure chart is referring to Fig. 3.
The special feature of embodiment 3 is, two blocks of square potsherds 2 are bonded in the upper and lower surface of vibrating diaphragm 3 respectively, and confinement element 4 retrains the center of two piezoelectric ceramic pieces 2 and vibrating diaphragm 3 noncontact faces respectively. the structure of two piezoelectric ceramic pieces 2 and surface electrode thereof are identical with embodiment 1, and structure chart is referring to Fig. 4.
The special feature of embodiment 4 is, square piezoelectric ceramic piece 2 is bonded in the upper surface of vibrating diaphragm 3, and confinement element 4 constraint piezoelectric ceramic pieces 2 and the center of vibrating diaphragm 3 noncontact faces and the center of vibrating diaphragm 3 lower surfaces, the structure of piezoelectric ceramic piece 2 and surface electrode thereof are identical with embodiment 1, and structure chart is referring to Fig. 5.
Embodiment 5
The special feature of embodiment 5 is that vibrating diaphragm 3 and piezoelectric ceramic piece 2 axial cross sections are circle, and other parts are identical with embodiment 1, and structure chart is referring to Fig. 6 a and Fig. 6 b.
Need to prove that above embodiment understands the utility model and the several more excellent execution mode enumerated for convenience, those skilled in the art can make any modification in the claim scope.
Claims (5)
1. piezoelectric speaker that adopts novel the way of restraint, comprise vibrating diaphragm (3), be bonded in the piezoelectric ceramic piece (2) on the vibrating diaphragm (3), the positive and negative electrode on potsherd surface, the confinement element (4) of constraint vibrating diaphragm (3) or piezoelectric ceramic piece (2), it is characterized in that the normal direction degree of freedom or three quadrature one-movement-freedom-degrees of one or more of the non-edge of confinement element (4) constraint vibrating diaphragm (3).
2. a kind of piezoelectric speaker that adopts novel the way of restraint according to claim 1 is characterized in that, described confinement element (4) constraint one or two non-edge of vibrating diaphragm (3) and acentric one or more.
3. a kind of piezoelectric speaker that adopts novel the way of restraint according to claim 1 is characterized in that, one or more of non-edge on described confinement element (4) constraint piezoelectric ceramic piece (2) and the non-contacting surface of vibrating diaphragm (3).
4. a kind of piezoelectric speaker that adopts novel the way of restraint according to claim 1 is characterized in that described piezoelectric ceramic piece (3) is square or circular.
5. a kind of piezoelectric speaker that adopts novel the way of restraint according to claim 1 is characterized in that described vibrating diaphragm (3) is square or circular.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920110607XU CN201467436U (en) | 2009-07-30 | 2009-07-30 | Piezoelectric loudspeaker adopting novel constraint form |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920110607XU CN201467436U (en) | 2009-07-30 | 2009-07-30 | Piezoelectric loudspeaker adopting novel constraint form |
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| Publication Number | Publication Date |
|---|---|
| CN201467436U true CN201467436U (en) | 2010-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920110607XU Expired - Fee Related CN201467436U (en) | 2009-07-30 | 2009-07-30 | Piezoelectric loudspeaker adopting novel constraint form |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022000636A1 (en) * | 2020-07-02 | 2022-01-06 | 瑞声声学科技(深圳)有限公司 | Piezoelectric ultrasonic transducer |
-
2009
- 2009-07-30 CN CN200920110607XU patent/CN201467436U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022000636A1 (en) * | 2020-07-02 | 2022-01-06 | 瑞声声学科技(深圳)有限公司 | Piezoelectric ultrasonic transducer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100512 Termination date: 20180730 |