CN1197363A - Element for reproducing and/or recording sound - Google Patents
Element for reproducing and/or recording sound Download PDFInfo
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- CN1197363A CN1197363A CN 98106159 CN98106159A CN1197363A CN 1197363 A CN1197363 A CN 1197363A CN 98106159 CN98106159 CN 98106159 CN 98106159 A CN98106159 A CN 98106159A CN 1197363 A CN1197363 A CN 1197363A
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- 239000011230 binding agent Substances 0.000 claims description 11
- 239000013536 elastomeric material Substances 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 229920001296 polysiloxane Polymers 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 3
- 229920002379 silicone rubber Polymers 0.000 claims description 3
- 239000004945 silicone rubber Substances 0.000 claims description 3
- 229910001369 Brass Inorganic materials 0.000 claims description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 239000010951 brass Substances 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 239000011888 foil Substances 0.000 claims description 2
- 229920003051 synthetic elastomer Polymers 0.000 claims description 2
- 239000005061 synthetic rubber Substances 0.000 claims description 2
- 230000008719 thickening Effects 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims 1
- 229910045601 alloy Inorganic materials 0.000 claims 1
- 239000013078 crystal Substances 0.000 claims 1
- 239000011133 lead Substances 0.000 claims 1
- 239000012528 membrane Substances 0.000 abstract 4
- 238000013016 damping Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 10
- 230000006870 function Effects 0.000 description 6
- 239000000919 ceramic Substances 0.000 description 4
- 230000005672 electromagnetic field Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000024241 parasitism Effects 0.000 description 3
- 238000005381 potential energy Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000009795 derivation Methods 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005520 electrodynamics Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- -1 for example Substances 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/222—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only for microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
This element for replaying and/or recording a sound consists of a membrane (3) provided with a piezoelectric element (5), an electric connecting means (6) acting in cooperation with the piezoelectric element (5), and a housing (2) for the membrane (3). And it contains a wall, part (17) arranged a short distance (D1) separated from the membrane (3) so that sound vibration generated by the membrane is subjected to damping.
Description
The present invention relates to an element that is used for playback and/or recording, be specifically related to a loud speaker, perhaps a loudspeaker.
More specifically, the present invention relates to a playback and/or a taped components that adopts a piezoelectric element.
As everyone knows, the signal of telecommunication can change into the acoustical vibration that can hear by various transcribers, and on the contrary, acoustical vibration can change into the signal of telecommunication.
First kind of audio reproducing apparatus having known is made up of electrodynamic loudspeaker.
Usually utilize this loud speaker of cone to have following major defect:
-occupy relatively large volume;
The power that-needs are big;
-have big power consumption, therefore need thicker line;
-because the height of magnet, so have sizable degree of depth;
-high pitch reproduces weak effect;
-to temperature and air humidity sensitivity;
-low output;
-" gamut " reproduced needs bigger size;
-generation electromagnetic field (EMC);
-because coil is heated under Chang Zaihe, may break down, so reliability is less relatively;
-very frangible cone needs special protection;
-design is complicated.
The another kind of audio reproducing apparatus of having known is made up of the static transcriber.
But this transcriber also shows quite a lot of shortcoming, and is as follows:
-very expensive;
-" gamut " reproduced needs bigger size;
-need high pressure;
-designing requirement height, and complicated;
-very responsive to humidity;
-to disturbing sensitivity;
-output only is reasonable;
The space that-needs are suitable.
The third audio reproducing apparatus of having known is made up of the piezoelectricity transcriber.
This a kind of transcriber in back adopts vibrating diaphragm, and by a supporter, normally a foil and a piezoelectric ceramic piece that is fixed on this supporter are formed.
This diaphragm suspends, and perhaps with elastic binder diaphragm is fixed at the node place on the shell to form node and suspend, and perhaps suspends at whole edge with rigid binder or elastic binder.
By a variable voltage being provided for diaphragm and piezoelectric patches, the material of piezoelectric ceramic piece will expand or shrink, because metal support self can not expand or shrink, thereby therefore integral body will produce a signal of hearing that is directly proportional with the frequency and the amplitude of the variation electromotive force that provides by the function bending that changes voltage.
Known that piezoelectric effect is mutual, promptly when diaphragm and piezoelectric patches, for example pass through acoustical vibration, when being moved, a motion of carrying out with diaphragm and therefore and the pressure in the piezoelectric ceramic piece of generation is varied to the voltage of direct ratio will be produced, therefore whole, comprise supporter and piezoelectric element, forming a function is micropkonic element.
The principal advantages of this piezoelectricity transcriber is:
-have very thin, a very flat design;
-have simply solid design;
-shock resistance, waterproof, high temperature resistance;
-can be used as loudspeaker;
-(EMC) do not generate an electromagnetic field;
-in light weight;
-need little energy;
-lead in the electric wire of loud speaker and do not need very big electric current;
Even-very little loud speaker also has very big voice output.
But the shortcoming of the embodiment of known up to now this piezoelectricity transcriber is that it only is applicable to the sound that reproduction is higher relatively, can not be used in the whole frequency ranges heard of 15Hz to 20kHz.
Particularly, below 1000Hz, may there be or has only the audio reproduction of a non-constant.That is, up to the present, adopt piezoelectric patches, most of word and music frequency spectrum can not be reproduced.And up to the present, this piezoelectricity transcriber only is used to buzzer, transducer and tweeter, not needing perhaps to be used for the loudspeaker and the loud speaker of the application of high-quality reproduction.
The present invention relates to the element of a kind of playback and/or recording, wherein adopt piezoelectric principle, but discharge or reduced the above-mentioned shortcoming of known embodiment.
Particularly, the present invention relates to a piezoelectric speaker, in the gamut of 20kHz, provide optimum audio reproduction at 15Hz.
Target of the present invention herein is an element that is applicable to little and big embodiment simultaneously, specifically from having a design that is designed into the diameter with 1m less than the diameter of 10mm.
For this reason, the present invention relates to the element of a playback and/or recording, comprise a diaphragm that a piezoelectric element is installed, an electronic connecting apparatus and a shell that is used for diaphragm of working with piezoelectric element, it is characterized in that this element comprises a sidewall sections that is positioned at from a bit of distance of diaphragm, the acoustical vibration of diaphragm generation is by amount of decrease like this.
Particularly, above-mentioned sidewall sections is positioned at apart from the so little distance of diaphragm, make the air that moves during acoustical vibration produces reflect at above-mentioned sidewall sections, thereby the vibration of reflection produces an amount of decrease on diaphragm.
Preferably the distance between diaphragm and the above-mentioned sidewall sections at 0.5mm between the 10mm, at 0.5mm to better between the 5mm.
By this way, just can in gamut, obtain an extraordinary audio reproduction.
The explanation of others is, the result of above-mentioned amount of decrease is reduced the quality factor of higher harmonic wave, and resonance frequency is lowered.
Above-mentioned sidewall sections and/or its preferably provide the hole that allows air to flow out on every side, make that sound can be easy to discharge the amount of decrease effect of but not losing above-mentioned sidewall sections.
According to a specific embodiment of the present invention, above-mentioned sidewall sections comprises the part that a quilt is thickeied, and it especially provides the advantage of discharging or having reduced the parasitism vibration of sidewall sections at least.
According to big diameter is designed useful especially another embodiment, above-mentioned sidewall sections provides one to have quite heavy weight part, makes above-mentioned amount of decrease effect be exaggerated, and has especially prevented parasitic vibration.
One or several part according to element of the present invention can provide an amount of decrease layer, and preferably such as the amount of decrease elastomeric material of silicone, it can absorb vibrational energy wherein when cracked, and the resonance spikes that can guarantee HFS is by amount of decrease.The result obtains better reproduction.
In order to explain feature of the present invention better, following preferred embodiment only is described as an example, and without any restricted, with reference to the accompanying drawings, wherein:
Fig. 1 represents the profile according to an element of the present invention.
Fig. 2 represents the profile according to Fig. 1 center line II-II.
Fig. 3,4 and 5 expressions and Fig. 1 are similar, but the profile that changes to some extent.
The schematic diagram of the more vast scale of the part shown in the F6 in Fig. 6 presentation graphs 4.
Fig. 7 to 22 represents a series of schematic diagrames.
Element 1 according to the present invention is used for playback and/or recording, and it comprises a shell 2; A diaphragm 3 is made up of a supporter 4 and a piezoelectric element 5 fixed thereon at least; With electronic connecting apparatus 6.
This situation shell 2 comprises a housing parts 7 that has a front side wall 8 and cylinder side wall 9.This housing parts 7 is preferably made by synthetic material.
The supporter 4 of diaphragm 3 comprises a sheet metal, is for example made by brass, and thickness is extremely thin.
Electronic connecting apparatus 6 comprises lead 12-13, and they are connected on the diaphragm 3 by this way, makes electromotive force to produce on whole piezoelectric element 5.
For example, these leads 12-13 is connected to the terminal 14-15 that is fixed on the shrouding disc 16 that forms the shell trailing flank.
Special feature of the present invention is that element 1 provides one along diaphragm 3, at the sidewall sections 17 that extends apart from its D1 place, to produce the amount of decrease effect.
Distance D 1 is very little in proportion, preferably is less than or equal to 10mm.Usually, this distance D 1 between the 5mm, depends on the size of loud speaker at 0.5mm.
On section, diaphragm 3 and sidewall sections 17 form a chamber 18 on every side, and it is darker than distance D 1.
Difference between the distance D 1 that obtains and chamber 18 degree of depth is the part 19 that the quilt of front side wall 8 is thickeied.
Be noted that the front side wall 8 that sidewall sections 17 is highly located can curve inwardly, so front side wall needn't be thickeied according to unshowned a kind of variation herein.But, adopt a reinforcement or reinforcing section 19 can guarantee to prevent because the parasitism that the vibration of front side wall 8 causes vibrates, as described later.
According to unshowned another variation herein, the inboard of front side wall 8 is flat fully, and its whole surface is positioned at apart from the position of diaphragm 3 a bit of distance D 1.
Provide hole 20 in shell 2, sound may outwards be propagated, these holes 20 are left on chamber 18 herein, and these holes are enough big, guarantee that air flows out, and get rid of or reduce possible filtering effect.
According to Fig. 1, diaphragm 3 provides an amount of decrease layer 21 at its leading flank, preferably made by elastomeric material such as silicone, silicone rubber or synthetic rubber, amount of decrease layer 21 herein is in order to absorb the vibrational energy that diaphragm produces during cracked, and the resonance spikes of guaranteeing high frequency is by amount of decrease.
Above-mentioned shrouding disc 16 can comprise a printed circuit board (PCB), can provide electronic component thereon, and hole 22 herein also is provided on this shrouding disc 16, and shrouding disc 16 guarantees not have excessive distortion to be added on the diaphragm 3 by occluded air.
Above-mentioned housing parts 7 and sidewall sections 17 are preferably made by synthetic material.
Shell 2 also has a ring flange, and fixing hole 23 is provided on it.
The following principle of course of work foundation of element 1: when giving signal of telecommunication of terminal 14-15, as the function of this signal, diaphragm 3 will begin vibration.This causes air displacement, makes to produce sound.Because small distance D1, and, produce above-mentioned amount of decrease effect because front side wall 8 provides one by the fact of reinforcement 19.
Fig. 3, three kinds of variations of 4 and 5 expressions, wherein in order to amplify the amount of decrease effect, above-mentioned sidewall sections 17 provides a weight or quality 24, and object 24 comprises a dish of being made by the material of big density, metal such as copper or lead for example, and this dish is provided in the shell 2.
When an amount of decrease layer 21 had been provided on the supporter 4 of diaphragm 3, amount of decrease layer 25 also can be provided at other place, as sidewall sections 17 or directly on the side of the object 24 of diaphragm 3, as shown in Figure 3.
In the variation according to Fig. 4, object 24 is positioned on the lateral surface of front side wall 8, and amount of decrease layer 25 is enclosed between shell 2 and the object 24.
Fig. 5 represents a variation, and object 24 and provide amount of decrease layer 25 thereon so to be provided makes chamber 18 enough big, be extended to after the object 24, and the latter is fixed on the central support 26.
Should be noted that Fig. 1, the supporter 4 in 3,4 and 5, piezoelectric element 5 and amount of decrease layer 21 all are schematic diagrames, seem that they are about the same thick, but in fact, amount of decrease layer 21 is obviously thicker than diaphragm 3, in the Fig. 6 that represents in more real mode, therefore for example thick 10 times be the magnitude of 1mm.Amount of decrease layer 25 preferably also has the thickness of 1mm magnitude.
In order further to set forth the present invention, provide the theoretical derivation of several basic principle of the present invention and characteristic below.
Fig. 7 and Fig. 8 signal express diaphragm 3 on the one hand nodes suspend (Fig. 7) and suspend difference between (Fig. 8) of edge on the other hand.
These diaphragms are represented resonance frequency.Produce unwanted effect on these resonance frequencys, they have negatively influencing to the quality of sound.
According to the present invention, we especially attempt these resonance frequencys are reduced to the lower limit that can listen frequency spectrum, promptly produce a kind of amount of decrease, with produce one can by 30Hz almost smooth transition to the frequency reproduction of 20kHz, therefore just can produce the covering gamut, and be produced without any the frequency of resonance frequency.
The resonance frequency F of dish circular, that node supports
RnCan be with following formulate:
Wherein,
The gross thickness of t=diaphragm 3;
The area of S=diaphragm;
Y=Young's modulus (N/m
2);
The density of d=supporter 4 is 2.5kg/dm at least
3
The r=Poisson's ratio.
This clearly illustrates that resonance frequency depends primarily on thickness and area, i.e. the diameter of diaphragm 3.Diaphragm 3 is thin more, and resonance frequency is low more.
In order to reduce resonance frequency, attempt being kept to minimum by thickness with supporter 4 and/or element 5, reduce the thickness of diaphragm 3.
But because physical cause, the thickness of supporter 4 can not be less than 20 microns.And in order to obtain the concentric as far as possible vibration that is generated, supporter 4 and element 5 preferably have same thickness.As a result, because the selection of the thickness of supporter 4 and element 5, resonance frequency can only be reduced to certain limit.
Should be noted that the ratio between element 5 diameter D2 and the supporter 4 diameter D3 should be between 0.85 to 0.5 because the edge suspends.Clearly, bigger supporter 4, corresponding bigger area S and less resonance frequency need bigger element 5, so cost significantly improve.
Comprise a potsherd that is bonded on the metal support 4, the resonance that forms the piezoelectric diaphragm 3 of so-called " homomorphs " depends on the mode that diaphragm 3 suspends.Because the edge suspends, in order to calculate resonance frequency, must charge to one COEFFICIENT K is installed, be generally 0.7.
Suspend for the edge, release:
As shown in Figure 9, from a laths of metal, its free end makes it heavier with weight G, theoretical derivation begin, this laths of metal does not have potential energy at first in resting position, does not have kinetic energy.
When weight by power F when position P1 moves on to position P2, weight G will have maximum potential, minimum kinetic energy.
When power F when position P2 removes, weight will be got back to its resting position P1, speed and kinetic energy increase between this moving period.Kinetic energy has maximum at weight G that time by position P1, and potential energy equals zero this moment.
Maximum kinetic energy guarantees that weight gets back to position P3, and kinetic energy reaches minimum value once more, and it is maximum that potential energy reaches once more.If there is not energy loss, the swing of generation vibration will continue forever.
Hunting frequency is by stave lengths L, and the quality of weight G and the modulus of elasticity of lath determine.By principle, ratio between this tittle and the pass between the hunting frequency are:
F
osc＝Y/(L×G)
Wherein,
The Y=young's modulus;
The length of L=lath;
The free-ended weight of G=lath.
Therefore, we can say that hunting frequency reduces when the quality of weight G increases, respectively shown in Figure 10 and 11, no weight of swing wherein, one has weight.
Consider that the weight in the above-mentioned formula of frequency and resonance frequency is inversely proportional to, and obtains following result:
In order to obtain this result with flat a, circular film 3, can use a kind of elastic binder, for example, silicone rubber clings its edge, makes that the function of shell 2 is a weight, and node is sitting at the Hookean region that diaphragm 3 is stuck at its edge.
What this illustrated in Figure 12 expresses, and wherein the curved shape of diaphragm 3 is by exaggerative.
Bending is characterised in that following size:
The skew at A=diaphragm center, for example 1mm represents 100Hz, and 0.3mm represents 300Hz, and 0.01mm represents 10kHz;
The radius of the free part of B=vibrating diaphragm 3;
A=clings at the edge skew of part;
The width of b=bearing edge, promptly above-mentioned flange 10.
Can say roughly that ratio a/b equals ratio A/B, then
a＝(A×b〕/B
If radius B is 12.5mm, bearing edge width b is 2mm, then
During a=0.16mm100Hz
During a=0.04mm300Hz
During a=0.0008mm10kHz
Therefore, the motion of vibrating disk end is to the maximum
0.16mm during 100Hz
0.04mm during 300Hz
0.0008mm during 10kHz
For example, be 35 when adopting viscosity, during the resilient silicone binding agent of 000mPa-s, the motion of the end of diaphragm 3 is unrestricted, but combines with the weight of shell 2 on every side, and this will reduce resonance also with it amount of decrease according to above-mentioned principle.This resonance in this design by amount of decrease, therefore not sharp-pointed than other design.
This passes through curve F in Figure 13
Rn, F
RiAnd F
RrThat is illustrated expresses, and representation node supports respectively, and diaphragm 3 is stuck or clamps the edge with fixing support, and diaphragm 3 is bonded to the resonance frequency of the support at edge by elastic binder 11.
Above-mentioned COEFFICIENT K can be expressed as:
K＝(b/D4)×v
Wherein,
The width of b=flange 10;
The diameter of the diaphragm that D4=records in flange 10;
The viscosity of v=binding agent 11.
The formula of resonance frequency is:
Because the density d (weight of every part of volume) of dish is influential to resonance frequency, form counter-force, will impact resonance by the vibrative inertia of density.Density is high more, and resonance frequency is low more.
Effect of inertia also has influence to the amount of decrease of higher resonance.When diaphragm 3 generation acoustical vibrations, and by after the short distance reflection, diaphragm 3 will be accepted more resistance on its whole surface, and it gets setting in motion slower like this.As a result, the quality factor of higher harmonics will reduce, and diaphragm 3 will obviously increase the weight of, and make resonance frequency reduce.
And higher, more sharp-pointed harmonic wave is alleviated.
In sum, when diaphragm 3 is installed in inwall near front side wall 8, during promptly a bit of distance D 1 place, density d will obviously increase, and make resonance phenomena by amount of decrease, and then level and smooth.
From last, can infer when above-mentioned distance D 1 to diminish, and that when sidewall sections 17 when promptly being positioned at surperficial S1 with the part at diaphragm 3 distance D 1 place and becoming big, density d obviously increases.Resonance frequency F is considered in this influence
RrIn the formula, can obtain:
Wherein,
S1=is positioned at apart from the area of the sidewall sections 17 of diaphragm 3 a bit of distance D 1;
Distance between D1=diaphragm 3 and the sidewall sections 17.
Clearly, can reduce resonance frequency by selecting as far as possible little distance D 1.
Accompanying drawing 14 has shown this difference, and wherein the variation of resonance frequency when distance D 1 is 10mm represented by curve C 1, and the variation when distance D 1 is 2mm is by curve C 2 representatives.
And, should notice that piezoelectric diaphragm can react very soon, in fact waveband width still is that the restriction of reaction speed is not considered.In sophisticated signal, such as language or music, many harmonic waves appear directly.Diaphragm 3 is forced to vibration in this case, and these frequencies are reacted.Therefore the situation of certain frequency composition at diaphragm 3 certain local resonance arranged, make at high-frequency smashing.Correspondingly, spike is arranged in the upper frequency in frequency analysis, this should be avoided, because they produce a special interference that has the certain frequency composition.These spikes schematically illustrate out in the curve of Figure 15.
As mentioned above, by using elastomeric material, cover diaphragm 3 as layer of silicone 21, this just can be prevented from according to the present invention.This amount of decrease layer 21 has absorbed the vibrational energy under the cracked situation, and the resonance spikes of high frequency treatment is illustrated as curve among Figure 16 by amount of decrease.
How the vibration T that expresses generation in the part is cracked of Figure 17 signal is absorbed by amount of decrease layer 21.Be used for warning function or the big acoustic pressure of needs is used for high-frequency especially application at the needs upper frequency, this amount of decrease layer may not provide, or a part may only be provided.
Clearly, in fact front side wall 8, when not taking measures, begin vibration with regard to the acoustical vibration that is transmitted into owing to diaphragm 3 on front side wall 8 inwalls at least.Produced parasitic vibration like this on front side wall 8, the vibration out-phase that it and required diaphragm 3 produce 20 is emitted from the hole, makes the distortion that can hear that produces voice signal.
And, for this reason, taked measure according to the present invention, make front side wall 8 by amount of decrease, thereby prevent from and/or reduce parasitism to vibrate.
As mentioned above, these measures are front side wall 8, and particularly sidewall sections 17, and the part 19 of thickening by a quilt and/or by adopting object 24 is reinforced.
The influence of amount of decrease layer 25 can be seen clearlyer from following explanation.
The kinetic energy of the front side wall 8 that moves can be expressed as follows:
Ek＝0.5×m×v
2+0.5×I×w
2
Wherein,
The m=quality;
V=speed;
The I=the moment of inertia;
W=angular speed or hunting frequency.
In order to prevent critical amount of decrease, must pressure P m be added on the point of front side wall 8 by acoustical vibration, should satisfy following condition:
Pm≤0.5×m×v
2
When front side wall 8 begins to vibrate, condition below must satisfying:
Pm≤0.5×m×v
2+0.5×I×w
2
In order to realize this condition, amount of decrease layer 25 is provided with weight.The elastomeric material of making this amount of decrease layer 25 is the shock wave amount of decrease, and the power of its generation is decomposed into a power and a several horizontal power forward.Function that we can say this amount of decrease layer 25 is a shock absorber, and wherein the power K that is produced by the vibration of diaphragm 3 is broken down into non-interference cross force, respectively shown in Figure 18 and 19 by amount of decrease.
The elastic modulus E that is noted that a kind of elastomeric material can be expressed as follows:
E＝3×k×(1-2×u)
E＝2×g×(1+u)
Wherein,
The k=bulk modulus;
U=cross-direction shrinkage coefficient;
G=slip modulus.
For most of materials, bulk modulus is 10
10N/m
2Or volume is reduced to 1% in 1000 atmospheric pressure.The bulk modulus that is used for 100% elastomeric material that extends, preferably between 0.1 and 1 or equal them, unit is N/m according to the present invention
2, that is:
0.1≤k≤1
The cross-direction shrinkage coefficient u of the elastomeric material that adopts preferably satisfies:
0≤u≤0.5
At last, several curves of the reproduction of a kind of known electronic transcriber and the sound that produces according to piezoelectricity transcriber of the present invention are shown in accompanying drawing 20,21 and 22.The curve that indicates ED herein is relevant with electronic transcriber, and it is relevant with the piezoelectricity transcriber to indicate the curve of PE.
And, Figure 20,21 and 22 respectively with have three different-diameters, i.e. 25mm, the embodiment of 35mm and 57mm is relevant.
The more clearly of curve PE and ED shows: adopt reproduction according to element 1 of the present invention, usually than the electronic embodiment of the similar size of employing, related acoustic pressure significantly better, stronger.
The described embodiment that the present invention is not limited to as an example, represents in the accompanying drawings; On the contrary, be used for this element of playback and/or recording can make different shape and size, and keep within the scope of the invention.
Claims (17)
1, is used for the element of playback and/or recording, comprise a diaphragm (3) that a piezoelectric element (5) is installed, the electronic connecting apparatus (6) of working with piezoelectric element (5) and the shell (2) of a diaphragm (3), it is characterized in that: element (1) comprises a sidewall sections (17) that is positioned at apart from a bit of distance of diaphragm (3) (D1), makes acoustical vibration that diaphragm (3) produces by amount of decrease.
2,, it is characterized in that the distance (D1) between diaphragm (3) and sidewall sections (17) is less than or equal to 10mm according to the element of claim 1.
3,, it is characterized in that distance (D1) between diaphragm (3) and sidewall sections (17) is between 0.5mm and 5mm according to the element of claim 2.
4,, it is characterized in that above-mentioned sidewall sections (17) is by local thickening according to the element of aforementioned any one claim.
5,, it is characterized in that a chamber (18) is circumferentially formed according to the element of aforementioned any one claim.
6,, it is characterized in that hole (20) is provided on the shell (2) according to the element of aforementioned any one claim.
7,, it is characterized in that hole (20) is at above-mentioned chamber (18) inner opening according to the element of claim 5 and 6.
8,, it is characterized in that above-mentioned sidewall sections (17) is the part of shell (2) according to the element of aforementioned any one claim.
9,, it is characterized in that above-mentioned sidewall sections (17) provides one and increases the weight of object or weight (24) according to the element of aforementioned any one claim.
10, according to the element of claim 9, it is characterized in that above-mentioned sidewall sections (17) comprises an object (24) between the sidewall that is provided at diaphragm (3) and parallel with it shell (2), wherein this object is installed in apart from this sidewall a distance, is preferably on the center support (26).
11, according to the element of claim 9 or 10, it is characterized in that object (24) comprises a dish of being made by big density material, preferably metal dish specifically is copper, brass, lead or alloy.
12,, it is characterized in that one or few component parts provide an amount of decrease layer (21-25) according to the element of aforementioned any one claim.
13, according to the element of claim 12, it is characterized in that above-mentioned amount of decrease layer (21-25) according to following any possibility, perhaps two or more following possible combinations are implemented:
-as the amount of decrease layer (21) on the diaphragm (3), be preferably in directly on the face of above-mentioned sidewall sections (17);
-in order to encourage higher frequency, part amount of decrease layer is arranged on the diaphragm or do not have the amount of decrease layer;
-as being provided at amount of decrease layer (25) on the above-mentioned sidewall sections (17) directly on the face of diaphragm (3);
-provide under the situation of weight (24) at sidewall sections (17), as being positioned at amount of decrease layer (25) on this object (24) side directly towards diaphragm (3).
14, according to the element of claim 12 or 13, it is characterized in that amount of decrease layer (21-25) made by elastomeric material, specifically be silicone, silicone rubber or synthetic rubber, the thickness that preferably has the 1mm magnitude.
15,, it is characterized in that diaphragm (3) comprises one by a foil and a supporter (4) that forms with piezoelectric crystal form piezoelectric element fixed thereon (5) according to the element of aforementioned any one claim.
16, according to the element of aforementioned any one claim, it is characterized in that diaphragm (3) by binding agent (11), preferably elastic binder is fixed on its edge on the flange (10) that is provided on the shell (2).
17, according to claim 1,2 or 3 element, it is characterized in that: shell (2) comprises a housing parts (7) that has front side wall (8), and front side wall (8) has reinforcement and/or a thickened sides wall part (17) and a sidewall (9) that provides the energy flange (10) that diaphragm (3) is fixed thereon that is positioned at apart from a bit of distance of diaphragm (3); Chamber (18) be formed at least this sidewall sections (17) darker than above-mentioned distance (D1) around, and opening be provided in this chamber (18) height front side wall (8) on; Amount of decrease layer (21) is provided on the diaphragm (3); Shell (2) provides a shrouding disc (16), and its rear wall is equipped with jockey (6).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE9700309A BE1011085A4 (en) | 1997-04-03 | 1997-04-03 | ELEMENT FOR PLAYING AND / OR RECORDING SOUND. |
| BE9700309 | 1997-04-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1197363A true CN1197363A (en) | 1998-10-28 |
Family
ID=3890445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98106159 Pending CN1197363A (en) | 1997-04-03 | 1998-04-02 | Element for reproducing and/or recording sound |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0871345A1 (en) |
| JP (1) | JPH10277484A (en) |
| KR (1) | KR19980080973A (en) |
| CN (1) | CN1197363A (en) |
| BE (1) | BE1011085A4 (en) |
| TW (1) | TW370762B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020186971A1 (en) * | 2019-03-19 | 2020-09-24 | 华为技术有限公司 | Vibration sounding device and electronic apparatus |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69930188T2 (en) | 1998-11-05 | 2006-12-07 | Matsushita Electric Industrial Co., Ltd., Kadoma | Piezoelectric speaker, method of making it, and speaker system with this speaker |
| GB9910216D0 (en) * | 1999-04-29 | 1999-06-30 | New Transducers Ltd | Vibration exciter |
| US6342749B1 (en) | 1999-04-29 | 2002-01-29 | New Transducers Limited | Vibration exciter |
| BE1015150A3 (en) * | 2002-10-21 | 2004-10-05 | Sonitron Nv | Improved transducer |
| JP2016099619A (en) * | 2014-11-26 | 2016-05-30 | 株式会社日本ロック | Piezoelectric buzzer |
| RU2664667C2 (en) * | 2017-02-21 | 2018-08-21 | Владимир Борисович Комиссаренко | Electro-acoustic transducer with damping of radiating membrane |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL6813996A (en) * | 1968-09-30 | 1970-04-01 | ||
| FR2542552B1 (en) * | 1983-03-07 | 1986-04-11 | Thomson Csf | ELECTROACOUSTIC TRANSDUCER WITH PIEZOELECTRIC DIAPHRAGM |
| FR2542550B1 (en) * | 1983-03-07 | 1986-11-14 | Thomson Csf | ELECTROACOUSTIC TRANSDUCER WITH INTEGRATED ACOUSTIC CORRECTION |
| JPS6096093A (en) * | 1983-10-31 | 1985-05-29 | Matsushita Electric Ind Co Ltd | Electroacoustic transducer container |
| JPH0819096A (en) * | 1994-06-28 | 1996-01-19 | Matsushita Electric Ind Co Ltd | Piezoelectric receiver |
-
1997
- 1997-04-03 BE BE9700309A patent/BE1011085A4/en active
-
1998
- 1998-03-06 EP EP98200716A patent/EP0871345A1/en not_active Withdrawn
- 1998-03-11 TW TW087103552A patent/TW370762B/en active
- 1998-04-01 KR KR1019980011423A patent/KR19980080973A/en not_active Application Discontinuation
- 1998-04-02 CN CN 98106159 patent/CN1197363A/en active Pending
- 1998-04-02 JP JP8989498A patent/JPH10277484A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020186971A1 (en) * | 2019-03-19 | 2020-09-24 | 华为技术有限公司 | Vibration sounding device and electronic apparatus |
| US11838720B2 (en) | 2019-03-19 | 2023-12-05 | Huawei Technologies Co., Ltd. | Vibration and sound-making apparatus and electronic device |
Also Published As
| Publication number | Publication date |
|---|---|
| BE1011085A4 (en) | 1999-04-06 |
| JPH10277484A (en) | 1998-10-20 |
| TW370762B (en) | 1999-09-21 |
| KR19980080973A (en) | 1998-11-25 |
| EP0871345A1 (en) | 1998-10-14 |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |