CN1997243B - Pliable loudspeaker and its making method - Google Patents
Pliable loudspeaker and its making method Download PDFInfo
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- CN1997243B CN1997243B CN200510137654XA CN200510137654A CN1997243B CN 1997243 B CN1997243 B CN 1997243B CN 200510137654X A CN200510137654X A CN 200510137654XA CN 200510137654 A CN200510137654 A CN 200510137654A CN 1997243 B CN1997243 B CN 1997243B
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Abstract
This invention relates to one flexible microphone and its process method, which forms sound to same direction with flexible piezoelectricity materials property by flexible driver parts, vibration film, and vibration electrode to overcome traditional technique defaults.
Description
Technical field
The present invention relates to a kind of flexible piezoelectric sound-generating devices, relate in particular to a kind of pliable loudspeaker and method for making thereof.
Background technology
Pursue in industry under the future development trend of compact and multifunction, in order to improve the competitiveness of product in market, industrial circle wishes that all the application of advanced technology develops and manufacture a product.
With loud speaker (Loudspeaker), the sounding principle of loud speaker is that the generation by the signal of telecommunication shakes vibrating diaphragm and produces sound, the sound that is sent changes and can send music, and can be applicable to such as flat-panel screens, notebook computer, mobile phone, PDA(Personal Digital Assistant), and consumption electronic products such as digital camera, and wherein such as the flat-panel screens product for utilize pliability electronics (Flexible Electronics) technology to develop at present with all strength just; That is, produce the associated electrical product by pliability electronic building bricks such as bendable plastics or thin metal matrix plates.Since use the product of this kind pliability electronic technology manufacturing have in light weight, cost is extremely cheap and characteristic such as shock-resistant, not only has dynamogenetic value, more can increase the designer in the imagination space on the product shape and the convenience that carries of user, expect that this technology will bring revolutionary variation for the industrial structure and human lives.
Again with regard to the type of loud speaker, can the loud speaker summary be divided into such as moving-coil type (Dynamic) loud speaker, piezoelectric type (Piezoelectric) loud speaker, and three kinds of electrostatic (Electrostatic) loud speakers etc. according to type of drive.
Coil-moving speaker is to use technology the widest, technology maturation at present, its motion principle is according to Fo Laiming (Fleming) left hand rule, the interaction that utilizes magnetic field, electric current, power three to intersect at a right angle, the reciprocating motion in the form of piston of control vibrating membrane drives air and produces sound, is used in a large number on various TV, sound equipment, earphone and the mobile phone.Yet, because the shortcoming of the congenital structure of coil-moving speaker, and can't be, make this kind conventional art can't meet the demand of the trend of the more and more littler and family's theater flattening of 3C Product with the volume flattening.
Piezo-electric loudspeaker utilizes the piezoelectric effect of piezoelectric, and additional electric field causes the characteristic of material deformation in piezoelectric, is used for promoting vibrating diaphragm (Diaphragm) sounding.Yet though this kind conventional art structure can flat microminiaturization, it is higher and can utilize frequency range few to be subject to the resonance frequency of piezoelectric, thereby makes its application limited, and it is in the majority only to be applied in siren at present.
The action principle of electrostatic loudspeaker is the fixed plate electrode clamping conductive diaphragm formation capacitor (Condenser) with two perforates, by supplying with the alternating voltage of vibrating diaphragm Dc bias and two synchronously positive antiphases of fixed electrode, the electrostatic force that utilizes positive and negative charge to take place, the drive conductive diaphragm vibrates and acoustic radiating is gone out.But, because supplying with the bias voltage of vibrating diaphragm, this kind conventional art need reach supreme kilovolts up to a hundred, and must external high unit price and bulky enlarger, so not only expend the energy, and can't lightweight, thereby reduce industrial utilization.
Simultaneously, the patent relevant with loud speaker for example comprises that United States Patent (USP) announces the 3rd, 646, and No. 280 case, United States Patent (USP) announce the 3rd, 894, No. 199 case, United States Patent (USP) announce the 3rd, 892, and No. 927 case, United States Patent (USP) announce the 3rd, 896, No. 274 case, United States Patent (USP) announce the 3rd, 935, No. 397 cases and No. 234232 technology such as case of Taiwan patent announcement.
United States Patent (USP) announces the 3rd, 646, and No. 280 cases disclose the electrostatic loudspeaker of a kind of use electret (Electret) material.The structure of this patent mainly comprises the electrode and the insulating component of a slice conductor vibrating diaphragm, a pair of then perforate electret, and with this insulating component this vibrating diaphragm symmetry is clamped in the middle of the two electrically charged electrets.In this patent, engage with electret by the utilization conductive fiber, problem such as can improve that electret be difficult for to be pasted and electret perforate and backboard perforate aligning accuracy be not good, and mat conductive fiber density provides, and vibrating diaphragm prevents dust, aqueous vapor blocks, adjusts advantages such as acoustic resistance coefficient.
Yet the utilization of this patent needs rigid outstanding limit fix vibrating diaphragm so that this vibrating diaphragm is possessed certain tension force, allows the air of this vibrating diaphragm arround being subjected to can drive behind the external force vibration produce sound whereby, and the perforate backboard also is rigid, thereby can't be made into bendable structure.Thus, because this kind conventional art bendable function of tool not, so can't be applied to the product that adopts the pliability electronic technology to develop.
United States Patent (USP) announces the 3rd, 894, No. 199 case discloses a kind of electroacoustic transducer (Electroacoustic Transducer), and the both sides electret in this patent is all stayed positive charge, the sensor conductor vibrating diaphragm becomes negative potential, can replace original Dc bias device that vibrating diaphragm is provided.Simultaneously, two lateral electrodes are supplied with synchronously positive antiphase AC signal from transformer, according to the electrostatic force formula, with the Dc bias effect of central vibrating diaphragm, produce and push away-La (Push-Pull) electrostatic force, promote the vibrating diaphragm vibration.
But this patent need use transformer to supply with synchronously positive antiphase AC signal, thereby needs two groups of big electric capacity and rectifier stack in the device; Thus, not only device volume is huge, and uses assembly more, and cost is also higher.Simultaneously, using this kind conventional art still needs to use rigid outstanding limit to fix vibrating diaphragm, and the perforate backboard also is rigid, the bendable function of tool not equally, and limit its range of application.
United States Patent (USP) announces the 3rd, 892, discloses a kind of loud speaker that has many to the electrode that is oppositely arranged in No. 927 cases.This patent structure is one group of battery lead plate that is divided into different in width, and in symmetrically the conductive diaphragm clamping being put, utilization is different cuts apart the influence of the corresponding effective area of electrostatic force between electrode and conductive diaphragm, causes and respectively cuts apart the electrode zone vibrating diaphragm first resonance frequency difference.So, just can utilize different electrode areas to cause different resonant frequencies, the loud speaker of low-Gao range is finished in the use of collocation partial device.
Yet the complex structure of this patent relatedly makes required cost high, can't be accepted by general consumption masses so price is higher.Simultaneously, the structure of this kind conventional art is made up of many different in width electrodes of cutting apart, and is congenital bulky, can't be applicable to such as miniature electro-acoustic assemblies such as hearing aids or earphones.In addition, need extra voltage to produce Dc bias, comparatively power consumption, and drive unit also comparatively bulky complex and costliness owing to use this kind conventional art.In addition, this kind conventional art still need use rigid outstanding limit to fix vibrating diaphragm, and the perforate backboard also is rigid, so also do not have a flexible function.
United States Patent (USP) announces the 3rd, 896, proposes a kind of electret earphone in No. 274 cases, be that the electret full wafer is sticked on electrode central authorities, and ring is established a plurality of borings around electret.Have charge stable evenly and paste advantages such as easy according to electret, the electret of a pair of relative position of utilization in this patent, induction middle position vibrating diaphragm becomes a direct current bias.
Yet the perforate of this patent evenly distributes, cause vibrating diaphragm vibrocompression air after sound can't radiate smoothly, and can produce standing wave in the space between this electret and this vibrating diaphragm, make loudspeaker enclosure not good, and have other resonance formation.In addition, this kind conventional art also needs to use rigid outstanding limit to fix vibrating diaphragm, and the perforate backboard still is rigid, so still there is the disappearance of aforementioned conventional technology.
United States Patent (USP) announces the 3rd, 935, proposes a kind of gauze grid (Wire Grid) electrode electrostatic loudspeaker assembly in No. 397 cases, and with the insulation gap material vibrating diaphragm symmetry is clamped in the middle of two electrode body.The electrode structure of this patent is by the framework winding metal wire with densely covered groove and tightens, to form the net grid board, except evenly providing the electrostatic induction electrode to the vibrating diaphragm, also provides the monomer Dust guard.
Yet, because the structure of this patent needs extra means to produce Dc bias, comparatively power consumption, and drive unit is also comparatively huge and expensive.Simultaneously, the applied net grid of this kind conventional art complex structure, price are higher, so do not have volume production competitiveness, so that can't accord with the demands of the market.In addition, conventional art also uses needs rigid outstanding limit fix vibrating diaphragm, and the perforate backboard also is rigid, still has not flexible and makes the narrow problem of range of application.
Then disclose a kind of electrostatic speaker unit of big sound press in No. 234232 case of Taiwan patent announcement, by lateral electrode is divided into multistage, and, provide difference to cut apart the different voltage of electrode with transformer collocation voltage adjusting device.In this patent, be the Dc bias induction that utilizes different voltage and central conductive diaphragm, form the little electrostatic force that do not wait of the big central authorities of symmetrical outside and distribute, so that evenly displacement vibration of each position of vibrating diaphragm.
Yet, because the displacement of the vibrating diaphragm of electrostatic electroacoustic device is minimum, just be close to linear motion originally, even utilization does not wait electrostatic force to cause region-wide displacement movement, the enable voice quality-improving significantly of waiting of vibrating diaphragm.And the signal of this kind conventional art drives amplifying device complexity, at high price, and volume is big, power consumption, is not suitable for being used in the application that needs the microminiature loud speaker such as earphone, hearing aids, mobile phone etc.In addition, the utilization of this kind conventional art still needs rigid outstanding limit to fix vibrating diaphragm, and the perforate backboard also is rigid, can't be made as bendable device.So, also there is the disappearance in the aforementioned patent, so that can't be applied in the product that adopts the development of pliability electronic technology.
Because the restriction of aforementioned conventional technology on the pronunciation principle, must fix outstanding limit and tighten vibrating diaphragm, the bendable function of tool not, and have that volume is big, complex structure, cost are higher, expend the energy and be unfavorable for disadvantages such as volume production, therefore, taking off the existing problem of prior art before how effectively solving, is to become the problem that present industry is demanded urgently overcoming.
Summary of the invention
The shortcoming of prior art in view of the above, purpose of the present invention promptly is to provide the pliable loudspeaker and the method for making thereof of the bendable function of a kind of tool.
Another object of the present invention is to provide a kind of Miniaturized pliable loudspeaker and method for making thereof.
A further object of the present invention is to provide a kind of simply constructed pliable loudspeaker and method for making thereof.
Another purpose of the present invention is to provide a kind of pliable loudspeaker with low cost and method for making thereof.
Another purpose again of the present invention is to provide a kind of pliable loudspeaker and method for making thereof that helps volume production.
But of the present invention again again a purpose be to provide a kind of pliable loudspeaker and method for making thereof of energy savings.
For reaching above-mentioned purpose and other purpose, the invention provides a kind of pliable loudspeaker and method for making thereof, this pliable loudspeaker comprises first and second vibrating diaphragm, at least one electrode and first and second flexible actuator.This first and second vibrating diaphragm has first surface and second surface respectively; This electrode is located at wherein one first surface of this first and second vibrating diaphragm at least, is used in conjunction with this first vibrating diaphragm and this second vibrating diaphragm; This first and second flexible actuator then be respectively equipped with fixed interval to the second surface of this first and second vibrating diaphragm with a plurality of support portions that the vibrating diaphragm tensile stress is provided and be located at this support portion respectively away from a side of this second surface forming the aperture portion of pronunciation monomer be out of shape in the same direction and produce sound so that input signal drives this first vibrating diaphragm and this second vibrating diaphragm during to this first and second flexible actuator.
Preferably, this first vibrating diaphragm and this second vibrating diaphragm are electret piezoelectricity vibrating diaphragm.This first vibrating diaphragm and this second vibrating diaphragm are wherein made vibrating diaphragms of individual layer and multilayer dielectric material, and this dielectric material inside comprises nano-micron pore hole film, and this dielectric material can be such as perfluoroethylene copolymerization of propylene compound FEP, polytetrafluoroethylene PTFE, polyvinyl dichloride PVDF, part fluoro containing polymers polymer or other suitable material.Wherein, the thickness of this individual layer dielectric material for example can be between 1 to 1000 micron scope.This electrode for example can be, and conductive metal film, elargol, tin indium oxide or other electric conducting material constitute.The thickness of this electrode can be between 0.01 to 3 micron scope, and this electrode can be the made electrode of light transmissive material.In aspect a preferred enforcement, this electrode comprises first electrode and second electrode, and the phase difference of this first electrode and second electrode is 180 degree.This first and second flexible actuator also can be the made flexible actuator of light transmissive material, and its aperture portion is array distribution, and respectively the aperture of this aperture portion can be difference.In aspect a preferred enforcement, this first and second flexible actuator is the conducting metal thin plate, and this conducting metal thin plate can be wire netting, makes that this aperture portion is the grid of wire netting, and this support portion then is the projection of this grid.Another preferably aspect the enforcement in, but this first and second flexible actuator then by perforated panel and be located at interval this perforated panel wherein the elargol on a surface constituted, the spacing distance of this elargol may be selected to be the hole spacing of this perforated panel and between hole and hole.
In addition, aspect a preferred enforcement in, can select this first vibrating diaphragm and this second vibrating diaphragm are located in this support portion.
The method for making of pliable loudspeaker of the present invention then can comprise the following steps: at first, and first and second vibrating diaphragm that has first surface and second surface respectively is provided; Then, the first surface one of them person of this first and second vibrating diaphragm forms electrode; Afterwards, the second surface of this first and second vibrating diaphragm be provided with respectively fixed interval to this second surface with a plurality of support portions that the vibrating diaphragm tensile stress is provided and be located at this support portion respectively away from a side of this second surface first and second flexible actuator with the aperture portion that forms the pronunciation monomer; At last, in conjunction with the first surface of this first vibrating diaphragm and this second vibrating diaphragm.
In this method for making, preferably porous Teflon PTFE film (Porous PTFE Film) and electret macromolecule membrane (Electret Film) wherein one are fixed in steel loop as this first vibrating diaphragm and this second vibrating diaphragm.The thickness of this first vibrating diaphragm and this second vibrating diaphragm can be in 1 to 1000 micron the scope.This electrode adopts to be selected from and comprises wherein one and form of the group that technology is formed that adopts evaporation, sputter and rotary coating, and wherein, this electrode can be aluminium lamination.Preferably, the utilization fabrography forms that this support portion, utilization microwave plasma surface-treated technology carry out to the second surface of this first vibrating diaphragm and this second vibrating diaphragm that surface coarsening is handled and with dc high-voltage the second surface of this first vibrating diaphragm and this second vibrating diaphragm is carried out corona charging (Corona Charging).And, when this electrode comprises first electrode and second electrode, at this first electrode and this second electrode coating one deck elargol, and press together face-to-face, with first surface in conjunction with this first vibrating diaphragm and this second vibrating diaphragm.In addition, it is made that this first vibrating diaphragm, this second vibrating diaphragm, this electrode, this first flexible actuator and the second flexible actuator are light transmissive material, but can complying with the actual needs of implementing, the technical staff in the technical field be changed, but not as limit.
Compared to conventional art, the present invention proposes a kind of pliable loudspeaker and method for making thereof, but the design fixed interval supports the flexible actuator of vibrating diaphragm, and the characteristic of soft piezoelectric is used in utilization, cooperate homophase and reverse signal to import this flexible actuator simultaneously, produce sound to drive inner soft piezoelectric as vibrating diaphragm, conventional art is fixing to hang that vibrating diaphragm is tightened on the limit and the disappearance of the bendable function of tool not so can solve.
Simultaneously, pliable loudspeaker of the present invention structure is very simple, with low cost and can adopt prior art to make and do not have the manufacture process puzzlement, is applicable to a large amount of productions in fact.In addition, because product tool pliability of the present invention is used the present invention and can be attached at body surface easily, so just can enlarge range of application and cause the limited disappearance of application to solve conventional art.And, because of the present invention simple in structure, can avoid the conventional art cost higher and than consumes energy and the emulative disappearance of volume production of not having, and can accord with the demands of the market.
As from the foregoing,, but can reach microminiaturized product, simplified construction, make effect with low cost, as to help volume production and energy savings, overcome the existing problem of prior art relatively by the designed flexible structure of the present invention.
Below by specific instantiation explanation embodiments of the present invention, those skilled in the art can understand other advantage of the present invention and effect easily by the content that this specification disclosed.The present invention also can be implemented or be used by other different instantiation, and the every details in this specification also can be based on different viewpoints and application, carries out various modifications and change under the spirit of the present invention not deviating from.
Description of drawings
Fig. 1 is the schematic diagram that shows the pliable loudspeaker of the first embodiment of the present invention, wherein this first vibrating diaphragm and the not combination as yet of this second vibrating diaphragm;
Fig. 2 is the schematic diagram that shows the pliable loudspeaker of the first embodiment of the present invention, wherein this first vibrating diaphragm and this second vibrating diaphragm combination;
Fig. 3 A is the STRUCTURE DECOMPOSITION schematic diagram that shows the pliable loudspeaker of first embodiment;
Fig. 3 B is the schematic perspective view that shows the pliable loudspeaker of first embodiment;
Fig. 3 C is the schematic diagram of variation example that shows the flexible actuator of first embodiment;
Fig. 4 is the schematic flow sheet of method for making of the pliable loudspeaker of first embodiment;
Fig. 5 is the local enlarged diagram that shows the pliable loudspeaker of first embodiment;
Fig. 6 is the schematic diagram of electroacoustic transfer principle that shows the vibrating diaphragm of first embodiment; And
Fig. 7 is the schematic flow sheet of method for making of the pliable loudspeaker of the display application second embodiment of the present invention.
The primary clustering symbol description
1 pliable loudspeaker
11 first vibrating diaphragms
111 first surfaces
113 second surfaces
13 second vibrating diaphragms
131 first surfaces
133 second surfaces
15 first electrodes
16 second electrodes
17 first flexible actuators
171 support portions
173 aperture portion
19 second flexible actuators
191 support portions
193 aperture portion
110 films
120 steel loops
130 aluminium laminations
140 perforate soft boards
1401 perforates
150 aluminium laminations
160 elargol
S1, S2, S2 ', S3, S4 step
Embodiment
Following embodiment further describes viewpoint of the present invention, but is not to limit the scope of the invention anyways.It should be noted that the those shown is the schematic diagram of simplification in the accompanying drawings, basic framework of the present invention only is described in a schematic way.Therefore, these accompanying drawings only show the formation relevant with the present invention, and shown structure be not number during according to actual enforcement, shape, and dimension scale draw, the specification during actual enforcement is real be a kind ofly optionally to design, in this statement.
First embodiment
Fig. 1 to Fig. 6 is the accompanying drawing that first embodiment according to pliable loudspeaker of the present invention and method for making thereof is drawn.
Consult Fig. 1, the decomposing schematic representation that shows pliable loudspeaker of the present invention, pliable loudspeaker 1 as shown in the figure comprise first vibrating diaphragm 11, second vibrating diaphragm 13, first electrode 15, second electrode 16 and the first flexible actuator 17 and the second flexible actuator 19.
As shown in Figure 1, this first vibrating diaphragm 11 and this second vibrating diaphragm 13 have first surface 111,131 and second surface 113,133 respectively.In the present embodiment, this first vibrating diaphragm 11 and this second vibrating diaphragm 13 may be selected to be after for example dielectric material process electrification (Electrized) processing and can possess the electret piezoelectricity vibrating diaphragm of electrostatic charge (Static Charges) for a long time, and this first vibrating diaphragm 11 can be the made vibrating diaphragm of single or multiple lift dielectric material (Dielectric Materials) with this second vibrating diaphragm 13, and this dielectric material can be for example perfluoroethylene copolymerization of propylene compound FEP, polytetrafluoroethylene PTFE, polyvinyl dichloride PVDF, part fluoro containing polymers polymer (Fluorine Polymer) and other suitable material, this dielectric material inside comprises the nano-micron pore hole, and the thickness of this individual layer dielectric material then can be 1 to 1000 micron (μ m).Handle the back and can possess the vibrating diaphragm of electrostatic charge and piezoelectricity for a long time through electrification because electret piezoelectricity vibrating diaphragm is a dielectric material, and can make inside comprise the nano-micron pore hole to increase light transmittance and piezoelectric property, behind corona charging, produce bipolarity electric charge (Dipolar Charges) and produce piezoelectric effect at material internal.
As shown in Figure 2, this first electrode 15 and this second electrode 16 are used in conjunction with this first vibrating diaphragm 11 and this second vibrating diaphragm 13, and are located at the first surface 111 of this first vibrating diaphragm 11 and the first surface 131 of this second vibrating diaphragm 13 respectively.In the present embodiment, this first electrode 15 and this second electrode 16 can be conductive layer, form similar sandwich structure with the first flexible actuator 17 and the second flexible actuator 19, can effectively the electron screening in this first vibrating diaphragm 11 and this second vibrating diaphragm 13 be run off within it and not.Simultaneously, it should be noted, though the first surface 111 and 131 of two-layer electrode in this first vibrating diaphragm 11 and this second vibrating diaphragm 13 is set in the present embodiment, but can only establish wherein one the first surface of one deck electrode in other embodiments, and not exceed with described in the present embodiment in this first and second vibrating diaphragm.In addition, the electrode in the present embodiment can be such as conductive metal film, elargol, and the conductive layer that constituted of tin indium oxide (ITO), but also not as limit, and this electrode also can be other conduction or surface and constitutes coated with the electric conductor of non-conducting material.
This first flexible actuator 17 and this second flexible actuator 19 are respectively equipped with a plurality of support portions 171,191 and aperture portion 173,193.These support portion 171,191 fixed interval to the second surface 113 and 133 of this first vibrating diaphragm 11 and this second vibrating diaphragm 13 so that the vibrating diaphragm tensile stress to be provided.This aperture portion 173, be located at respectively this support portion 171 for 193,191 away from a side of this second surface 113 and 133 forming the pronunciation monomer be out of shape in the same direction with this second vibrating diaphragm 13 and produce sound so that input signal drives this first vibrating diaphragm 11 during to this first flexible actuator 17 and this second flexible actuator 19.
In the present embodiment, be positioned at outermost aperture portion 173,193 mainly as the external voice signal input part, input simultaneously and voice signal homophase originally and reverse signal to be to drive the vibration that the first inner vibrating diaphragm 11 and second vibrating diaphragm 13 produce push-pull effects (Push-Pull Effect) respectively, and making that this first vibrating diaphragm 11 and this second vibrating diaphragm 13 are stressed becomes linear relationship with external signal voltage.Simultaneously, respectively the aperture of this aperture portion 173,193 can be difference, and is not limited to shown in the accompanying drawing in the present embodiment.This support portion 171, this first vibrating diaphragm 11 and this second vibrating diaphragm 13 are withstood in 191 parts, to provide this first vibrating diaphragm 11 and this second vibrating diaphragm 13 suitable tensile stress, and with this aperture portion 173,193 each aperture and pairing first vibrating diaphragm 11 and second vibrating diaphragm, the 13 local miniature piezoelectric pronunciation monomers that form, can make this first vibrating diaphragm 11 and this second vibrating diaphragm 13 be subjected to external signal voltage to stimulate the distortion of back generation to all directions, convert flexural deformation smoothly to, the air that drives arround this first vibrating diaphragm 11 and this second vibrating diaphragm 13 produces sound.
It should be noted, the first flexible actuator 17 in the present embodiment and the second flexible actuator 19 can be made of for example soft conduction perforated panel and interval material, that is, as shown in Figure 3A, this aperture portion 173,193 can be the aperture on the soft conduction perforated panel, this support portion 191 (171) then is interval material (part that only shows this second flexible actuator 19 among the figure), but be not as limit, as long as can make this first flexible actuator 17 and the second flexible actuator 19 for the flexible structure and in conjunction with all being applicable to invention behind this first vibrating diaphragm 11 and this second vibrating diaphragm 13 for flexible structure person (shown in Fig. 3 B) yet.
Simultaneously, the inner formed miniature piezoelectric pronunciation of pliable loudspeaker of the present invention monomer can be different and produce the miniature piezoelectrics pronunciation monomer arrays of different sizes according to the distributing position of this support portion 171,191 and this aperture portion 173,193; For example, intensive more perforate can produce high more sound frequency range, so as to sending the alternative sounds frequency range, and does not exceed shown in the accompanying drawing in the present embodiment, the technical staff in the technical field can be according to actual needs or design change, to change the sound frequency range of being sent whereby.
In addition, the support portion 191 (171) shown in Fig. 3 B is the interval material of convex dot shape, but also can be other equivalent structure in other embodiments, for example shown in Fig. 3 C, and the interval material of these support portion 191 (171) raised line shapes.Because it is the projective structure of arbitrary shape that the technical staff in the technical field can change this support portion 171,191, so no longer describe with regard to the variation example of other equivalence at this.
After with this first vibrating diaphragm 11 and 13 combinations of this second vibrating diaphragm, as shown in Figure 2, cooperate homophase and reverse signal to import this first flexible actuator 17 and the second flexible actuator 19 simultaneously, for example in-phase signal is imported this first flexible actuator 17, reverse signal is imported this second flexible actuator 19, and the soft piezoelectric that just can drive in inner this first vibrating diaphragm 11 and this second vibrating diaphragm 13 produces sound.Simultaneously, because this first flexible actuator 17 and the second flexible actuator 19 can provide this first vibrating diaphragm 11 and this second vibrating diaphragm 13 suitable tensile stress, and with to should first vibrating diaphragm 11 and this second vibrating diaphragm 13 local miniature piezoelectrics pronunciation monomers that form, can allow this first vibrating diaphragm 11 and this second vibrating diaphragm 13 be subjected to external signal voltage to stimulate the deformed configurations advantage of back generation to all directions, after making large stretch of loud speaker, also can pronounce even cut into different shape, and can be attached at body surface; Whereby, just can increase the designer in the imagination space on the external form and user's convenience of carrying, and reach conventional art the effect that can not accomplish fully.
The method for making of the pliable loudspeaker of present embodiment then can be as shown in Figure 4 flow process, and comprise the following steps S1 to S4:
In step S1, provide first and second vibrating diaphragm with first surface and second surface.In the present embodiment, as shown in Figure 5, the porous Teflon PTFE film 110 that a for example desirable thickness is 3 microns, use sticker to be fixed on the steel loop 120 around the film 110 such as double faced adhesive tape or Instant cement, make PTFE film 110 possess certain tension force, as this first vibrating diaphragm 11 and this second vibrating diaphragm 13.Can answer the electrical fluorine-containing molecular film material of the reinforcing yin essence of apparatus as this first vibrating diaphragm 11 and this second vibrating diaphragm 13 in the present embodiment, has the microcellular structure of receiving film in the fluoro containing polymers generation, produce piezoelectric property with charged for a long time and printing opacity through corona charging, and can plate the electrically conducting transparent thing on the surface, for example tin indium oxide, PEDOT etc., produce pliable loudspeaker with transparent piezoelectric, promote the range of application of loud speaker whereby with light transmission.Simultaneously, though in the present embodiment with thickness be 3 microns porous ptfe film as vibrating diaphragm, the thickness of vibrating diaphragm and does not exceed with described in the present embodiment preferably in 1 to 1000 micron scope for example.
In step S2, at one of them person's of this first and second vibrating diaphragm first surface formation electrode.In the present embodiment, the mode that for example can adopt evaporation, sputter or rotary coating the first surface 111 and 131 of this first vibrating diaphragm 11 and this second vibrating diaphragm 13 plate thickness be 0.1 micron aluminium lamination 130 as this first electrode 15 and this second electrode 16, be the earthy electrode of this first vibrating diaphragm 11 and this second vibrating diaphragm 13 in this first electrode 15 and second electrode 16.It should be noted, though form in the present embodiment thickness be 0.1 micron aluminium lamination as electrode, the thickness of electrode and does not exceed with described in the present embodiment preferably in 0.01 to 3 micron scope for example.Simultaneously, this first electrode 15 and the made electrode of second electrode, 16 preferred light transmissive materials, but also not as limit.
In step S3, the second surface of this first and second vibrating diaphragm be provided with respectively fixed interval to this second surface with a plurality of support portions that the vibrating diaphragm tensile stress is provided and be located at this support portion respectively away from a side of this second surface first and second flexible actuator with the aperture portion that forms the pronunciation monomer.
In the present embodiment, for example can get a thickness earlier and be 0.2 centimetre plastics perforate soft board 140, percent opening may be selected to be 30%, wherein one side with the mode of evaporation or sputter plate thickness be 0.1 micron aluminium lamination 150 as conductive layer, be used as the external signal input to make this plastics perforate soft board 140 become a soft conduction perforated panel.Afterwards, be coated with conductive layer (promptly at this perforate soft board, aluminium lamination in the present embodiment) it is that 50 microns elargol 160 is as spaced points that surface uses the wire mark thickness in the middle of the spacing of each tapping point of fabrography for example, the size of spaced points is 1/8th of a hole spacing, that is, make elargol 160 as this support portion 171 and 191, this aperture portion 173 and 193 then can be the perforate 1401 on this perforate soft board 140; So, just, can make this first flexible actuator 17 and this second flexible actuator 19.In the present embodiment, the spacing distance of this elargol 160 can for example be the hole spacing of this perforate soft board 140 and between hole and hole.
In addition, for increasing the then degree of this elargol 160, can use the surface (that is second surface 113 and 133) that this first vibrating diaphragm 11 and this second vibrating diaphragm 13 is not coated with electrode such as microwave plasma surface-treated technology to carry out surface coarsening and handle.Subsequently, can with the second surface 113 of this first vibrating diaphragm 11 and this second vibrating diaphragm 13 and 133 and perforate soft board 140 contain surface that elargol 160 is provided with at interval (promptly, this the first flexible actuator 17 and the second flexible actuator 19) caking property that had with elargol 160 followed, and just can be in conjunction with this first vibrating diaphragm 11 and this second vibrating diaphragm 13 and this first flexible actuator 17 and the second flexible actuator 19.
Will be appreciated that, owing to all belong to conventional art such as evaporation, sputter, rotary coating, wire mark, the principle that reaches technology such as microwave plasma surface treatment and effect, so this no longer explaining more.Certainly, method for making of the present invention is not as limit, and the technical staff in the technical field also can and revise each layer thickness of structure according to actual needs or design change.Simultaneously, this first flexible actuator 17 and the second flexible actuator 19 can equally with vibrating diaphragm and electrode be the made flexible actuator of light transmissive material also, but also not as limit.
In step S4, in conjunction with the first surface of this first vibrating diaphragm and this second vibrating diaphragm.In the present embodiment, for example can be coated with one deck elargol (not icon), and press together face-to-face, with first surface in conjunction with this first vibrating diaphragm and this second vibrating diaphragm at this first electrode 15 and this second electrode 16.So, can utilize this first electrode 15 and second electrode 16 first surface 111 and 131 ground connection with this first vibrating diaphragm 11 and this second vibrating diaphragm 13, the second surface 113 of this first vibrating diaphragm 11 and this second vibrating diaphragm 13 and 133 dc high-voltages with for example 20kV are made corona charging, so that this first vibrating diaphragm 11 and this second vibrating diaphragm, 13 inside are had electric charge stationed, and follow piezoelectric property to produce.
Electroacoustic transfer principle by electret piezoelectricity vibrating diaphragm is: when the electret electric charge is the bipolarity electric charge, to have piezoelectric property, the molecular structure of this electret is generally non-crystalline polymer (Amorphous Polymer), form two sides electrode insulated from each other in the two-sided conducting objects that plates, after this structure being heated to the glass transition temperature (Glass Transition Temperature) of polymer, between two electrodes, continue to fill with high-tension electricity a period of time, promptly form the bipolarity electric charge, for example PVDF.In the present embodiment, can use the bipolarity charge characteristic and the electrostatic force effect of electret inside, after electret vibrating membrane is subjected to the external voltage stimulation, produce perpendicular or parallel in the distortion on vibrating diaphragm surface.Like this,, perpendicular or parallel distortion in the vibrating diaphragm surface originally can be transformed into flexural deformation, and then the air that drives arround the vibrating diaphragm produces sound, as shown in Figure 6 if vibrating diaphragm four limits fix.According to electrostatic force formula and energy law, vibrating diaphragm is stressed for the capacitance of whole loud speaker is multiplied by internal electric field size and outside sound import voltage signal, if vibrating diaphragm is stressed big more, then output sound is big more.
Therefore, present embodiment can be received microcellular structure at electret piezoelectricity vibrating diaphragm (that is, this first vibrating diaphragm 11 and this second vibrating diaphragm 13) internal production, and is long-pending to increase the internal reservoir charged surface, and obviously improves the permanent storage quantity of electric charge and piezoelectric property.And, when the fluoro containing polymers thin-film material has the microcellular structure of receiving, also can form printing opacity electret (for example FEP), so that the pliable loudspeaker tool light transmission in the present embodiment, to increase its application.Hence one can see that, and vibrating diaphragm of the present invention inside can comprise nanometer micrometer structure increases output volume and light transmission.
By the pliable loudspeaker of present embodiment and method for making thereof as can be known, use soft electret piezoelectric membrane, cooperate the flexible actuator to drive vibrating diaphragm and produce sound, construct very simply and with low cost, be fit to very much a large amount of productions because the present invention is design.Simultaneously, because the advantage of structure tool flexible not only can make the miniaturization of products, more do not need the additive decrementation energy, and help energy savings.In addition, in the pliability electronic technology that pliable loudspeaker of the present invention can be applicable to develop at present with all strength, for example to be applied to display, except making display has also sound the image demonstration generation, and can become the main flow of following portable multimedia microscope carrier, have dynamogenetic value.
Than the conventional art bendable function of tool not, and have that volume is big, complex structure, cost are higher, expend the energy and be unfavorable for disadvantages such as volume production, the invention provides pliable loudspeaker with in the product that is applied to characteristics such as tool is in light weight and shock-resistant, simultaneously but the design of simplified structure can make with low cost and energy savings, and and then volume production significantly.Therefore, the bendable function of tool of the present invention and Miniaturized, and simple structure and do not need additionally to increase volume, make with low cost, help volume production, also do not need the additive decrementation energy, but and energy savings, the real existing problem of prior art that solved.
Second embodiment
The accompanying drawing that Fig. 7 is drawn for second embodiment according to pliable loudspeaker of the present invention and method for making thereof.Wherein, the assembly identical or approximate with previous embodiment represent with identical or approximate element numbers, and omit detailed narration, so that the explanation of this case is clearer understandable.
The maximum difference of second embodiment and first embodiment is that the first flexible actuator and the second flexible actuator among first embodiment can be made of for example soft conduction perforated panel and interval material, and the first flexible actuator and the second flexible actuator among second embodiment then can be for example conducting metal thin plate.Simultaneously, as shown in Figure 7, wherein one the first surface in this first and second vibrating diaphragm in step S2 ' of the recipe step in the present embodiment forms electrode, and must not form two electrodes as first embodiment.
In addition, this the first flexible actuator and the second flexible actuator can be for example conducting metal thin plate, this conducting metal thin plate has the aperture portion that staggered grid can replace first embodiment, and the projection of this grid then can replace the support portion of first embodiment as spaced points.Thus, just can letter economize required component count.
And the first flexible actuator and the second flexible actuator in the present embodiment itself can conduct electricity, so can simplify the method for making of first embodiment and required material.For instance, in the present embodiment, a desirable thickness is that 4 microns electret macromolecule membrane is fixed on the steel loop, makes film possess certain tension force, with the vibrating diaphragm as pliable loudspeaker.Then, the mode that adopts evaporation or sputter this first vibrating diaphragm and this second vibrating diaphragm wherein simultaneously (for example first surface) to plate thickness be that 0.05 micron aluminium lamination is as the earthy electrode of vibrating diaphragm.Then, get a thickness and be 0.2 centimetre open-porous metal net, this open-porous metal net is a conducting metal thin plate as the external signal input, and percent opening for example can be 50%, and with the projection of the staggered-mesh of open-porous metal net itself as spaced points, and after this vibrating diaphragm and the combination of this open-porous metal net can around fix with adhesive tape.Method for making afterwards just can be with described in first embodiment identical, so this no longer explaining more.
Comprehensively aforementioned, the present invention proposes a kind of pliable loudspeaker and method for making thereof, the loud speaker external Design is become to have flexual structure, and use soft piezoelectric as vibrating diaphragm, can be made into large stretch of pliable loudspeaker so use the present invention, after cutting into difformity, still can pronounce, and can change the structure of actuator and change the sound frequency range arbitrarily as cloth, and can deflection attach with the surface configuration of application product, to correspond to actual needs.So, can under the structure of microminiaturization, increase functionally, solve the existing problem of prior art relatively.
The foregoing description is illustrative principle of the present invention and effect thereof only, but not is used to limit the present invention.Any the technical staff in the technical field all can be under spirit of the present invention and scope, and the foregoing description is modified and changed.For example, can revise first and second embodiment for making first and second vibrating diaphragm, electrode and first and second flexible actuator simultaneously, but not making earlier wherein has vibrating diaphragm, electrode and flexible actuator is one group of construction unit, carries out pressing again after making another group same structure; Perhaps, can revise first embodiment for input signal being received simultaneously the electrode of subtend, the signal that for example is connected to this first flexible actuator 17 among Fig. 1 also can be connected to this electrode 16 simultaneously, and the signal that is connected to this second flexible actuator 19 also can be connected to this electrode 15 simultaneously, that is, this electrode is earthy except that can be used as, and also can connect external signal, and must set up insulating barrier this moment between two electrodes of first embodiment; In addition, also can select this first vibrating diaphragm and this second vibrating diaphragm are located in this support portion.Therefore, claim is listed as described later for the scope of the present invention.
Claims (27)
1. pliable loudspeaker comprises:
First and second vibrating diaphragm has first surface and second surface respectively;
Electrode is located at the first surface of this first or second vibrating diaphragm at least, is used in conjunction with this first vibrating diaphragm and this second vibrating diaphragm; And
First and second flexible actuator, for bendable material made, be respectively equipped with fixed interval to the second surface of this first and second vibrating diaphragm with a plurality of support portions that the vibrating diaphragm tensile stress is provided and be located at this support portion respectively away from a side of this second surface to form the aperture portion of pronunciation monomer, this aperture portion is array distribution, is out of shape in the same direction and produces sound so that input signal drives this first vibrating diaphragm and this second vibrating diaphragm during to this first and second flexible actuator.
2. pliable loudspeaker as claimed in claim 1, wherein, this first vibrating diaphragm and this second vibrating diaphragm are electret piezoelectricity vibrating diaphragm.
3. pliable loudspeaker as claimed in claim 1, wherein, this first vibrating diaphragm and this second vibrating diaphragm are the made vibrating diaphragm of single or multiple lift dielectric material.
4. pliable loudspeaker as claimed in claim 3, wherein, this dielectric material inside comprises the nano-micron pore hole.
5. pliable loudspeaker as claimed in claim 3, wherein, this dielectric material is the material of perfluoroethylene copolymerization of propylene compound, polytetrafluoroethylene, polyvinyl dichloride or part fluoro containing polymers polymer.
6. pliable loudspeaker as claimed in claim 3, wherein, the thickness of this individual layer dielectric material is 1 to 1000 micron.
7. pliable loudspeaker as claimed in claim 1, wherein, this electrode is made of conductive metal film, elargol or tin indium oxide.
8. pliable loudspeaker as claimed in claim 1, wherein, the thickness of this electrode is 0.01 to 3 micron.
9. pliable loudspeaker as claimed in claim 1, wherein, this electrode comprises first electrode and second electrode.
10. pliable loudspeaker as claimed in claim 1, wherein, the aperture difference of this aperture portion respectively.
11. pliable loudspeaker as claimed in claim 1, wherein, this first and second flexible actuator is the conducting metal thin plate.
12. pliable loudspeaker as claimed in claim 11, wherein, this conducting metal thin plate is a wire netting.
13. pliable loudspeaker as claimed in claim 12, wherein, this aperture portion is the grid of wire netting, and this support portion then is the projection of this grid.
14. pliable loudspeaker as claimed in claim 1, wherein, this first and second flexible actuator by perforated panel and be located at interval this perforated panel wherein the elargol on a surface constituted.
15. pliable loudspeaker as claimed in claim 14, wherein, the spacing distance of this elargol is the hole spacing of this perforated panel and between hole and hole.
16. the method for making of a pliable loudspeaker comprises the following steps:
First and second vibrating diaphragm that has first surface and second surface respectively is provided;
First surface at this first or second vibrating diaphragm at least forms electrode;
The second surface of this first and second vibrating diaphragm be provided with respectively fixed interval to this second surface with a plurality of support portions that the vibrating diaphragm tensile stress is provided and be located at this support portion respectively away from a side of this second surface first and second flexible actuator with the aperture portion that forms the pronunciation monomer, this first and second flexible actuator is that bendable material is made, and this aperture portion is array distribution; And
First surface in conjunction with this first vibrating diaphragm and this second vibrating diaphragm.
17. method for making as claimed in claim 16 wherein, is fixed in steel loop as this first vibrating diaphragm and this second vibrating diaphragm with ptfe porous membrane or electret macromolecule membrane.
18. method for making as claimed in claim 16, wherein, the thickness of this first vibrating diaphragm and this second vibrating diaphragm is 1 to 1000 micron.
19. method for making as claimed in claim 16, wherein, this electrode adopts the technology of evaporation, sputter or rotary coating and forms.
20. method for making as claimed in claim 16, wherein, this electrode is an aluminium lamination.
21. method for making as claimed in claim 16, wherein, the utilization fabrography forms this support portion.
22. method for making as claimed in claim 16, wherein, utilization microwave plasma surface-treated technology is carried out the surface coarsening processing to the second surface of this first vibrating diaphragm and this second vibrating diaphragm.
23. method for making as claimed in claim 16 wherein, is carried out corona charging with dc high-voltage to the second surface of this first vibrating diaphragm and this second vibrating diaphragm.
24. method for making as claimed in claim 16, wherein, this electrode comprises first electrode and second electrode.
25. method for making as claimed in claim 24 wherein, at this first electrode and this second electrode coating one deck elargol, and presses together, face-to-face with the first surface in conjunction with this first vibrating diaphragm and this second vibrating diaphragm.
26. method for making as claimed in claim 16, wherein, it is made that this first vibrating diaphragm, this second vibrating diaphragm, this electrode, this first flexible actuator and the second flexible actuator are light transmissive material.
27. a pliable loudspeaker comprises:
First and second vibrating diaphragm has first surface and second surface respectively, and this second surface is installed with a plurality of support portions that the vibrating diaphragm tensile stress is provided respectively at interval;
Electrode is located at the first surface of this first or second vibrating diaphragm at least, is used in conjunction with this first vibrating diaphragm and this second vibrating diaphragm; And
First and second flexible actuator, for bendable material made, have respectively be located at this support portion respectively away from a side of this second surface forming a plurality of aperture portion of pronunciation monomer, this aperture portion is array distribution so that input signal drives this first vibrating diaphragm and this second vibrating diaphragm during to this first and second flexible actuator is out of shape in the same direction and produces sound.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200510137654XA CN1997243B (en) | 2005-12-31 | 2005-12-31 | Pliable loudspeaker and its making method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200510137654XA CN1997243B (en) | 2005-12-31 | 2005-12-31 | Pliable loudspeaker and its making method |
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| CN1997243A CN1997243A (en) | 2007-07-11 |
| CN1997243B true CN1997243B (en) | 2011-07-27 |
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| CN200510137654XA Expired - Fee Related CN1997243B (en) | 2005-12-31 | 2005-12-31 | Pliable loudspeaker and its making method |
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