CN204948349U - Piezoelectric electroacoustic transducer - Google Patents
Piezoelectric electroacoustic transducer Download PDFInfo
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- CN204948349U CN204948349U CN201520566713.4U CN201520566713U CN204948349U CN 204948349 U CN204948349 U CN 204948349U CN 201520566713 U CN201520566713 U CN 201520566713U CN 204948349 U CN204948349 U CN 204948349U
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Abstract
A piezoelectric electroacoustic transducer comprises a first elastic piece, a second elastic piece, a first piezoelectric element attached to the first elastic piece, and a second piezoelectric element attached to the second elastic piece, wherein the bending part of the first elastic piece bends towards one direction, the bending part of the second elastic piece bends towards the opposite direction, and two ends of the first elastic piece are respectively jointed with two ends of the second elastic piece, so that the bending part of the first elastic piece is separated from the bending part of the second elastic piece. In addition, a specific embodiment of the piezoelectric electroacoustic transducer of the present application is a piezoelectric bone conduction transducer.
Description
Technical field
The application relates to a kind of transducer, espespecially a kind of piezo-electric electro-acoustic transducer.
Background technology
Traditionally, the design principle of piezoelectric earphone is utilize the electric energy of piezoelectric element and the transfer characteristic of mechanical energy, under alternating voltage drives, flat piezoelectric element is made to produce deformation, activate the elastic component be attached on piezoelectric element whereby, and then push air to change the density distribution of air molecule, the gas molecule of this density distribution can transmit sound wave, produce sound press.
Another bone conduction earphone, becomes the mechanical oscillation of different frequency by electric energy conversion, by the skull of the mankind, auditory nerve, to brain auditory center, thus allow the mankind hear sound.This kind of bone conduction earphone can save the step of many sound waves transmission, and sound wave also can not have influence on other people because of spreading in atmosphere.
But, if during by traditional type piezoelectric earphone as bond-conduction sound purposes, although the vibrational energy of elastic component can produce the sense of hearing via osteoacusis partially, but also can push air and produce sound simultaneously, that is, the vibrational energy of part still can cause sound to leak through air transmitted because of elastic component pile-up air.This for bone conduction earphone do not wish occur thing.
Therefore, how to overcome the problems referred to above, for current those skilled in the art endeavours the target of research and development.
Utility model content
For solving the many disadvantages of aforementioned prior art, the utility model provides a kind of piezo-electric electro-acoustic transducer, to reduce noise.
Piezo-electric electro-acoustic transducer of the present utility model, comprising: the first elastic component, and it has two ends in the longitudinal direction, between the two ends of this first elastic component, form the bend that bends towards first direction and the two sides in order to define thickness; Second elastic component, it has two ends in the longitudinal direction, between the two ends of this second elastic component, form the bend that bends towards the second direction in contrast to this first direction and the two sides in order to define thickness, the two ends of this second elastic component engage with the two ends of this first elastic component respectively, and the sweep of the bend of this second elastic component and this first elastic component is from a distance; At least one first piezoelectric element, it is attached at least one side on this two sides of this first elastic component, to have identical curvature with this first elastic component; And at least one second piezoelectric element, it is attached at least one side on this two sides of this second elastic component, to have identical curvature with this second elastic component, wherein, when providing the signal of telecommunication to give this first and second piezoelectric element, this first and second piezoelectric element activated for this signal of telecommunication can drive this first and second elastic component to vibrate respectively.In addition, this first elastic component is greater than the amplitude vibrated towards this second direction towards the amplitude that this first direction vibrates, and this second elastic component is greater than the amplitude vibrated towards this first direction towards the amplitude that this second direction is vibrated, and this first direction is the direction away from this second elastic component, and this second direction is the direction away from this first elastic component.
In addition, the one side of this second flexure strip of the vicinity on this two sides of this first flexure strip is pasted with this first piezoelectric element, the one side of this first flexure strip of the vicinity on this two sides of this second flexure strip is pasted with this second piezoelectric element, and when providing the identical signal of telecommunication to give this first and second piezoelectric element, this first flexure strip and this second flexure strip can be made to vibrate toward this first direction simultaneously, or simultaneously toward the vibration of this second direction.
The piezo-electric electro-acoustic transducer of the application also comprises bearing part, for carrying this first elastic component and this second elastic component of engaging; And buffer body, it is arranged between this first elastic component and this bearing part and between this second elastic component and this bearing part, does not contact this bearing part to make this first elastic component with this second elastic component; This bearing part comprises the hollow box with opening and the film covering this opening, this second elastic component and this second piezoelectric element to be contained in this hollow box and to make this first elastic component and this first piezoelectric element expose to this opening, and this plastic film covering exposes outside the first elastic component of this opening to provide prestressing force to this first elastic component.
The piezo-electric electro-acoustic transducer of the application also comprises the 3rd elastic component be arranged between this first elastic component and this second elastic component and at least one 3rd piezoelectric element being attached at the 3rd elastic component, 3rd elastic component has two ends in the longitudinal direction and the two sides in order to define thickness, the two ends of the two ends of the 3rd elastic component, the two ends of this first elastic component and this second elastic component engage, and this at least one 3rd piezoelectric element is attached at least one side on this two sides of the 3rd elastic component.
The piezo-electric electro-acoustic transducer of the application also comprises the 4th elastic component be arranged between the 3rd elastic component and this second elastic component and at least one 4th piezoelectric element being attached at the 4th elastic component, 4th elastic component has two ends in the longitudinal direction, formed towards the bending bend of this second direction between the two ends of the 4th elastic component, and in order to define the two sides of thickness, and this at least one 4th piezoelectric element is attached at least one side on this two sides of the 4th elastic component, wherein, 3rd elastic component has the bend being formed between the two ends of the 3rd elastic component and bend towards this first direction, the two ends of the 4th elastic component, the two ends of the 3rd elastic component, the two ends of this second elastic component and the two ends of this first elastic component are for engaging, and the bend of the bend of the 4th elastic component and the 3rd elastic component is for separating.
In addition, the piezo-electric electro-acoustic transducer of the application is a kind of piezoelectric bone conduction transducer.
Accompanying drawing explanation
Figure 1A and Figure 1B is stereogram and the end view of an embodiment of the piezo-electric electro-acoustic transducer of the application;
Fig. 2 A is the schematic diagram of another embodiment of the piezo-electric electro-acoustic transducer of the application;
Fig. 2 B is the schematic diagram of the another embodiment of the piezo-electric electro-acoustic transducer of the application;
Fig. 3 is the generalized section of an embodiment of the piezo-electric electro-acoustic transducer of the application;
Fig. 4 A-Fig. 4 C is the reference examples of the piezo-electric electro-acoustic transducer of the application and the test result figure of embodiment 1;
Fig. 5 A-Fig. 5 C is the test result figure of the embodiment 1,2,3 and 4 of the piezo-electric electro-acoustic transducer of the application;
Fig. 6 A-Fig. 6 C is the test result figure of the embodiment 1,5 and 6 of the piezo-electric electro-acoustic transducer of the application; And
Fig. 7 A-Fig. 7 C is the test result figure of the embodiment 1,7,8 and 9 of the piezo-electric electro-acoustic transducer of the application.
Symbol description
21,23,25,27 elastic components
211,231,251,271 bends
212,232,252,272 ends
21T, 23T, 25T, 27T, 21L, 23L face
22,24,26,28 piezoelectric elements
3 bearing parts
31 empty vans
310 openings
32 films
4 buffer bodies
A, B direction
D distance
T thickness.
Embodiment
The execution mode of the application is described below by way of particular specific embodiment, and those skilled in the art can be understood other advantages and the effect of the application easily by content disclosed herein.Notice, structure, ratio, size etc. that this specification institute accompanying drawings illustrates, all only in order to coordinate the content disclosed in specification, for understanding and the reading of those skilled in the art, and be not used to limit the enforceable qualifications of the application, therefore the not technical essential meaning of tool, the adjustment of the modification of any structure, the change of proportionate relationship or size, do not affecting under the effect that the application can produce and the object that can reach, still all should drop on technology contents disclosed in the present application and obtain in the scope that can contain.
Refer to Figure 1A-Figure 1B, the piezo-electric electro-acoustic transducer of the application mainly comprises two elastic components 21 and 23 and is attached at two piezoelectric elements 22 and 24 of each elastic component 21 and 23 respectively.
Elastic component 21 has the bend 211 that formed and bend towards direction A and two ends 212 in the longitudinal direction, and its shape can be other shapes that rectangle or essence length-width ratio are greater than 1, such as oval etc.Elastic component 21 has the thickness T that can be defined by two relative face 21T, the length that can be defined by two relative face 21L and width, and the length-width ratio of this length and thickness is greater than 1.It should be noted that, direction A be elastic component 21 normal on away from the direction of elastic component 23.
Elastic component 23 has the bend 231 that formed and bend towards direction B and two ends 232 in the longitudinal direction, and its shape can be other shapes that rectangle or essence length-width ratio are greater than 1, such as oval etc.Elastic component 23 has the thickness T that can be defined by two relative face 23T, the length that can be defined by two relative face 23L and width, and the length-width ratio of this length and thickness is greater than 1.It should be noted that, direction B be elastic component 23 normal on away from the direction of elastic component 21.
Elastic component 21 is identical with the structure of 23, can be lamina or multilayer composite sheet, such as, up and down for pltine and the three-layer composite board of therebetween pressure-sensing glue.
In addition, the two ends 212 of elastic component 21 engage with the two ends 232 of elastic component 23 respectively, and the bend 211 of elastic component 21 is separated a distance D with the bend 231 of elastic component 23, in other words, distance between elastic component 21 and 23 is maximum between bend 211 and 231, and diminishes gradually the closer to the two ends 212 of elastic component 21 and the two ends 232 of elastic component 23.In addition, be all in rectangular example in elastic component 21 and 23, the two sides 21L of elastic component 21 can be utilized to have engaged the combination of elastic component 21 and 23 with the two sides 23L of elastic component 23 respectively.Described joint such as can be coated with sticker on the two sides 21L of elastic component 21 and the two sides 23L of elastic component 23, then both are mutually bonding.
Piezoelectric element 22 is attached at the wherein one side of the two sides 21T of elastic component 21, and has identical curvature with elastic component 21.Piezoelectric element 24 is attached at the wherein one side of the two sides 21T of elastic component 21, and has identical curvature with elastic component 23.It should be noted that, although illustrations illustrate elastic component 21 only the one side 21T one side of elastic component 23 (contiguous) be pasted with piezoelectric element 22, elastic component 23 only one side 23T (one side of contiguous elastic component 21) is pasted with piezoelectric element 24, but when specifically implementing, the two sides 21T of elastic component 21 all can be pasted with piezoelectric element 22, and the two sides 23T of elastic component 23 all can be pasted with piezoelectric element 24.In addition, piezoelectric element 22 is identical with 24, such as, be all piezoelectric ceramic, PVDF or Piezoelectric anisotropy brake.
In addition, bending elastic component and the method for making of piezoelectric element can be such as, to the sweeping elastic component force of a script to make it be temporary transient tabular, then insert in an inner mould for vacuum state, again a flat piezoelectric element is attached at this flat elastic component, remove the vacuum state in this mould afterwards, to make this elastic component reply as bending from tabular, then this piezoelectric element just can have the identical curvature of elastic component forniciform with this.
Consult Fig. 2 A, in an execution mode, the piezo-electric electro-acoustic transducer of the application also can comprise the elastic component 25 be arranged between elastic component 21 and 23 and the piezoelectric element 26 be attached on elastic component 25.Elastic component 25 has two ends 252 in the longitudinal direction and the two sides 25T in order to define thickness, elastic component 25 except its two ends 252 be engage with the two ends 212 of elastic component 21 and the two ends 231 of elastic component 23 except, other positions do not contact with 23 with elastic component 21.Piezoelectric element 26 can be attached at least one side of the two sides 25T of elastic component 25.Elastic component 25 in present embodiment is tabular.
Consult Fig. 2 B, in another execution mode, the piezo-electric electro-acoustic transducer of the application also can comprise the elastic component 27 be arranged between elastic component 23 and 25 and the piezoelectric element 28 be attached on elastic component 27.Elastic component 27 have formed bend towards direction B bend 271, be positioned at the two ends 272 on length direction and the two sides 27T in order to define thickness, piezoelectric element 28 can be attached at least one side of the two sides 27T of elastic component 27.The one side 27T that the application Fig. 2 B only illustrates piezoelectric element 22 is attached at the one side 21T of the contiguous elastic component 25 of elastic component 21, piezoelectric element 26 is attached at the contiguous elastic component 27 of elastic component 25 one side 25T, piezoelectric element 28 is attached at the contiguous elastic component 25 of elastic component 27, piezoelectric element 24 are attached at the one side 23T of the contiguous elastic component 27 of elastic component 23.In addition, the two ends 272 of elastic component 27, the two ends 252 of elastic component 25, the two ends 232 of elastic component 23 and the two ends 212 of elastic component 21 engage, elastic component 25 has the bend 257 being formed and bend towards direction A, and the bend 271 of elastic component 27 is separated with the bend 251 of elastic component 25.
According to Figure 1A-Fig. 2 B, the piezo-electric electro-acoustic transducer of the application mainly comprises the elastic component 21 and 23 that two ends engage and the piezoelectric element 22 and 24 attached respectively thereon, and when considering vibration or sound conduction, can between elastic component 21 and 23 one or more elastic component of design configurations and attach one or more piezoelectric element thereon.In addition, when configuration one elastic component, it can be tabular, and when configuring multiple elastic component, is preferably the elastic component that even number bending direction is contrary.
Consult Fig. 3, in another execution mode, the buffer body 4 that the piezo-electric electro-acoustic transducer of the application can comprise the bearing part 3 for carrying the elastic component 21 and 23 engaged and be located between elastic component 21 and bearing part 3 and between elastic component 23 and bearing part 3.Buffer body 4 does not directly contact with bearing part 3 with 23 for making the elastic component 21 engaged, and generally speaking can have viscosity, to be fixed on bearing part 3 in the two ends 212 of the elastic component engaged 21 and the two ends 232 of elastic component 23.Buffer body 4 is UV fixing glue, sense micelle colloid, silica gel colloid or bipeltate body such as.
Bearing part 3 can be the framework that supports the bearing part of elastic component 21 and 23 engaged or comprising as shown in Figure 3 has the hollow box 31 of opening 310 and the film 32 of coated opening 310.Elastic component 23 and piezoelectric element 24 can be contained in this hollow box 31 and to make elastic component 21 and piezoelectric element 22 expose outside opening 310 by hollow box 31, and there is after film 32 drawn tension force, be covered in the elastic component 21 that exposes outside from opening 310, prestressing force is provided to elastic component 21 and piezoelectric element 22 with perseverance, in other words, the film 32 with Horizontal Tension vertically forces in the bend 211 of elastic component 21, become the prestressing force being supplied to elastic component 21, make elastic component 21 can reach preferably rebound effect, more increase the Oscillation Amplitude toward direction A.In addition, buffer body 4 also can be arranged between the bend of elastomer 23 and the bottom surface of hollow box 31, touches hollow box to avoid elastomer 23 in time vibrating.
When providing the signal of telecommunication respectively to piezoelectric element 22 and 24, such as alternating current, piezoelectric element 22 and 24 stretches by the actuating of this signal of telecommunication, and then drives elastic component 21 and 23 to vibrate.Specifically, consult Figure 1A-Figure 1B, when piezoelectric element 22 stretches, elastic component 21 vibrates towards direction B; When piezoelectric element 22 shrinks, elastic component 21 vibrates towards direction A; When piezoelectric element 24 stretches, elastic component 23 vibrates towards direction A; And piezoelectric element 24 is when shrinking, elastic component 23 vibrates towards direction B.If when piezoelectric element 22 and 24 is attached at the not coplanar of elastic component 21 and 23 certainly, elastic component 21 and 23 also has and is different from aforesaid mode of vibration.In addition, because elastic component 21 structurally bends towards direction A, this can hamper the flexible start of piezoelectric element 22, thus elastic component 21 toward direction A vibrate time can produce larger displacement and acceleration, and toward direction B vibrate time displacement and acceleration relatively little; Similarly, because elastic component 23 structurally bends towards direction B, this can hamper the flexible start of piezoelectric element 24, thus elastic component 23 toward direction B vibrate time can produce larger displacement and acceleration, and toward direction A vibrate time displacement and acceleration relatively little.
In addition, piezoelectric element 22 can be attached at the one side 21T of the contiguous elastic component 23 of elastic component 21, piezoelectric element 24 can be attached at the one side 23T of the contiguous elastic component 21 of elastic component 23, when providing the identical signal of telecommunication respectively to piezoelectric element 22 and 24, elastic component 21 can vibrate toward direction A with elastic component 23 simultaneously or vibrate toward direction B simultaneously.Whereby, elastic component 21 vibrates to make the air molecule of B side, direction distribute comparatively thin toward direction A and produces negative relative, and elastic component 23 makes air molecule distribute closeer toward direction A vibration with the air pushing A side, direction and produces relative malleation simultaneously; Or elastic component 21 makes air molecule distribute closeer toward direction B vibration with the air pushing B side, direction and produces relative malleation, elastic component 23 vibrates to make the air molecule of A side, direction distribute comparatively thin toward direction B and produces negative relative simultaneously.Thus, receive during alternating current so that dynamic elasticity part 21 and 23 vibrate at piezoelectric element 22 and 24, elastic component 21 and the air between 23 maintain air molecule density identical in fact because a such one positive negative pressure disappears mutually.
Therefore, the specific embodiment of the piezo-electric electro-acoustic transducer of the application is piezoelectric bone conduction transducer, elastic component 21 or 23 performs bond-conduction sound in order to contact the skin of people, elastic component 21 and 23 has larger displacement amount and acceleration respectively on direction A and direction B, therefore can strengthen and put on vibration on bone to promote the intensity of conduction sound, in addition, elastic component 21 and 23 has respectively and littlely adds displacement and acceleration on direction B and direction A, therefore the extruding that can reduce the air between elastic component 21 and 23, add elastic component 21 and 23 is vibrate toward same direction to disappear each other to the extruding of air between elastic component 21 and 23 mutually simultaneously, more can maintain roughly the same atmospheric density, and then the probability that reduction sound leaks through air transmitted, noise can be eliminated significantly whereby.Then, the separating distance of two elastic components of the piezo-electric electro-acoustic transducer of the application, the vibration displacement amount (displacement) of the thickness of each elastic component and the tension force of film and elastic component, vibration acceleration (acceleration) are described with table 1 and Fig. 4 A-Fig. 7 C, leak the relation of sound press (leakageSPL).The test condition of reference examples and embodiment 1-9 is: voltage 10Vrms, the vibration displacement amount and the acceleration that are placed in 10mm place above artificial ear, utilize Laser rangefinder measurement elastic component centre bend.Separately measure in silent room and leak sound press, radio reception distance is set as 10cm.
It should be noted that, the piezo-electric electro-acoustic transducer of embodiment 1-9 for such as shown in Fig. 3, two elastic components be bending and its sweep from there being a distance, respective two ends engage and are fixedly arranged in hollow box with the buffer body of tool viscosity again; Two elastic components of reference examples are tabular, and its two ends do not engage but are fixedly arranged in hollow box with the buffer body of tool viscosity respectively, and all sites of two elastic components has all been separated same distance.Hollow box is of a size of 32mm × 7mm × 1.8mm, each piezoelectric element is of a size of 25mm × 4mm × 0.1mm, the length and width of each elastic component are 30mm × 5mm, and the tension force of the distance of the thickness of each elastic component, two elastic components, film is as shown in table 1.
Table 1
Consult table 1 and Fig. 4 A-Fig. 4 C, the difference of the piezo-electric electro-acoustic transducer between reference examples and embodiment 1 is only the shape of elastic component, as shown in Figure 4 A, the piezo-electric electro-acoustic transducer of embodiment 1 play vibration frequency at about 120Hz, the Mean Oscillation displacement between low frequency 100 ~ 500Hz about 37 μm; That reviews the piezo-electric electro-acoustic transducer of reference examples plays vibration frequency at about 230Hz, the Mean Oscillation displacement between low frequency 100 ~ 500Hz about 25 μm, is obviously little compared with embodiment 1.As shown in Figure 4 B, the starting of oscillation acceleration of the piezo-electric electro-acoustic transducer of embodiment 1 appears at frequency and is about 120Hz, more than 0.9m/s
2, the average acceleration between low frequency 100 ~ 500Hz is about 0.96m/s
2; The starting of oscillation acceleration reviewing the piezo-electric electro-acoustic transducer of reference examples appears at frequency and is about 230Hz, about 0.7m/s
2, the average acceleration between low frequency 100 ~ 500Hz is about 0.6m/s
2, be obviously little compared with embodiment 1.As shown in Figure 4 C, the vibration frequency that rises of the piezo-electric electro-acoustic transducer of embodiment 1 is about 120-130Hz, and the sound pressure level between low frequency 100 ~ 500Hz is about 45dB, gradually increases to 50dB toward low frequency is slow; The vibration frequency that rises reviewing the piezo-electric electro-acoustic transducer of reference examples is about 230Hz, and the sound pressure level between low frequency 100 ~ 500Hz is about 53dB, and gradually increase to 68dB toward low frequency certificate, obviously comparatively embodiment 1 is large.
From Fig. 4 A-4C, forniciform elastic component is compared to flat elastic component, larger displacement and acceleration can be provided and there is less SPL, representing that two elastic components of the piezo-electric electro-acoustic transducer of embodiment 1 inwardly push that the amplitude of air is less and outwards to vibrate the amplitude of bone larger.It should be noted that, so-called be inwardly two elastic components direction close to each other herein, and be outwards two elastic components mutually away from direction.Reviewing two elastic components of the piezo-electric electro-acoustic transducer of reference examples owing to being tabular, deformation cannot being caused to hinder to attaching piezoelectric element thereon, therefore be difficult to the amplitude that suppresses to push air inwardly, cause that there is larger SPL.
Therefore, the electric energy received mainly can be converted to the vibrational energy via osteoacusis by the piezo-electric electro-acoustic transducer of the application, compared to reference examples, only has few person can convert the vibrational energy of air transmitted to.
Consult table 1 and Fig. 5 A-Fig. 5 C, the separating distance inquiring into two elastic components is respectively 1mm, 2mm, 3m and 4mm impact for vibration displacement amount, acceleration and sound pressure level.As shown in Figure 5A, a vibration frequency of the piezo-electric electro-acoustic transducer of embodiment 1,2,3 and 4 is all at about 120-130Hz, the displacement curve distribution of each embodiment is close, but wherein, the vibration displacement amount of embodiment 1 (separating distance 2mm) and 3 (separating distance 3mm) is larger, can reach more than 37 μm, and the vibration displacement amount of embodiment 2 (separating distance 1mm) and 4 (separating distance 4mm) is less.As shown in Figure 5 B, the accelerating curve distribution of each embodiment is close, but wherein, the acceleration of embodiment 1 (separating distance 2mm) and 3 (separating distance 3mm) is comparatively large, can reach 1m/s
2above, and the acceleration of embodiment 2 (separating distance 1mm) and 4 (separating distance 4mm) is less.From Fig. 5 A-Fig. 5 B, displacement and the acceleration of elastic component have corresponding relation.Then as shown in Figure 5 C, the curve of the sound pressure level of each embodiment is roughly in smoothed curve, play vibration frequency and be about 120-130Hz, average SPL is from the 60db of 100Hz, gradually toward extenuating as 45db during high frequency, this has been extremely quiet degree, and especially the SPL of embodiment 1 (separating distance 2mm) and 3 (separating distance 3mm) is less.
According to Fig. 5 A-Fig. 5 C, the separating distance of the bend of two elastic components has a preferred range.The separating distance of said two elastic components more can be regarded as the flexibility of elastic component, and such as, during distance 1mm, during flexibility less, distance 4mm, flexibility is larger.In addition, the prestressing force that the too small elastic component of flexibility can be supplied to piezoelectric element is just little, and the excessive elastic component of right flexibility easily becomes again non-linear, therefore the preferred range of the separating distance of the bend of two elastic components is 1mm-4mm.
Consult table 1 and Fig. 6 A-Fig. 6 C, inquire into membrane tension and be respectively 10N, 15N and 20N impact for vibration displacement amount, acceleration and sound pressure level.As shown in Fig. 6 A and Fig. 6 B, the vibration frequency that rises in each embodiment has and changes a little, and the vibration displacement amount of the piezo-electric electro-acoustic transducer of embodiment 1 (tension force is 15N) and acceleration are comparatively large, embodiment 6 (tension force is 20N) is taken second place, embodiment 5 (tension force is 10N) is minimum.As known in Fig. 6 C, each embodiment all shows lower SPL at frequency 100-10000Hz.
According to Fig. 6 A-Fig. 6 C, suitable membrane tension can contribute to the rebound effect of elastic component, it is just little that too small membrane tension can bestow elastomeric prestressing force, and only excessive membrane tension, except obviously changing except a vibration frequency of piezoelectric voltage transducer, also may cause the raising of the SPL leaked.Therefore, the preferred range of the tension force of film is 10N-20N.
Consult table 1 and Fig. 7 A-Fig. 7 C, the thickness inquiring into elastic component is respectively 0.1mm, 0.15mm, 0.2mm and 0.25mm impact for vibration displacement amount, acceleration and leakage sound press.As shown in figs. 7 a and 7b, the piezoelectric voltage transducer of embodiment 7 (thickness is 0.1mm) can reach lower vibration frequency, about 50Hz, and displacement herein and acceleration are about 28 μm and 0.7m/s respectively
2, the vibration frequency that rises of embodiment 1 (thickness is 0.15mm) piezoelectric voltage transducer is increased to about 120-130Hz, and the Mean Oscillation displacement between low frequency 100 ~ 500Hz about 37 μm, average acceleration is about 0.96m/s
2.As seen in figure 7 c, each embodiment all shows lower SPL at frequency 100-10000Hz.
According to Fig. 7 A-Fig. 7 C, the thickness through adjustment elastic component can control vibration frequency and an oscillation intensity of elastic component, and blocked up elastic component may cause too high SPL because rigidity is too large.Therefore, the preferred range of the thickness of elastic component is 0.1mm-0.25mm.
In sum, the piezo-electric electro-acoustic transducer of the application mainly comprises two two ends and engages and two elastic components that bend is separated, be attached at two piezoelectric elements on two elastic components respectively, also comprise the film be covered on a wherein elastic component, the stress had to activate by piezoelectric element through electric signal, the elastic force of bending elastic component, the prestressed combined influence that the tension force of film provides, the direction of two elastic components is outwardly made to have larger vibration displacement amount and acceleration, the intensity of sound through osteoacusis can be improved, the another direction inwardly has less vibration displacement amount and acceleration, internal air extrusion can be reduced, and the two elastic components pressure energy that internal air produces in time vibrating disappears each other mutually, therefore the sound that reduction air transmitted causes greatly leaks, reduce and leak sound press.Noise is significantly reduced compared to traditional bone conductors earphone.
The effect of above-mentioned execution mode only illustrative the application, but not for limiting the application, any those skilled in the art all under the spirit and category of the application, can carry out modifying to those execution modes above-mentioned and change.In addition, the number of the structure in those execution modes above-mentioned is only illustrative, also non-for limiting the application.Therefore the rights protection scope of the application, should listed by claims.
Claims (10)
1. a piezo-electric electro-acoustic transducer, is characterized by, and this piezo-electric electro-acoustic transducer comprises:
First elastic component, it has two ends in the longitudinal direction, between the two ends of this first elastic component, form the bend that bends towards first direction and the two sides in order to define thickness;
Second elastic component, it has two ends in the longitudinal direction, between the two ends of this second elastic component, form the bend that bends towards the second direction in contrast to this first direction and the two sides in order to define thickness, the two ends of this second elastic component engage with the two ends of this first elastic component respectively, and the sweep of the bend of this second elastic component and this first elastic component is from a distance;
At least one first piezoelectric element, it is attached at least one side on this two sides of this first elastic component, to have identical curvature with this first elastic component; And
At least one second piezoelectric element, it is attached at least one side on this two sides of this second elastic component, to have identical curvature with this second elastic component;
Wherein, when providing the signal of telecommunication to give this first and second piezoelectric element, this first and second piezoelectric element activated for this signal of telecommunication can drive this first and second elastic component to vibrate respectively.
2. piezo-electric electro-acoustic transducer as claimed in claim 1, it is characterized by, this first elastic component is greater than the amplitude vibrated towards this second direction towards the amplitude that this first direction vibrates, and this second elastic component is greater than the amplitude vibrated towards this first direction towards the amplitude that this second direction is vibrated, and this first direction is the direction away from this second elastic component, and this second direction is the direction away from this first elastic component.
3. piezo-electric electro-acoustic transducer as claimed in claim 1, it is characterized by, the one side of this second flexure strip of the vicinity on this two sides of this first flexure strip is pasted with this first piezoelectric element, the one side of this first flexure strip of the vicinity on this two sides of this second flexure strip is pasted with this second piezoelectric element, and when providing the identical signal of telecommunication to give this first and second piezoelectric element, this first flexure strip and this second flexure strip can be made to vibrate toward this first direction simultaneously, or simultaneously toward the vibration of this second direction.
4. piezo-electric electro-acoustic transducer as claimed in claim 1, it is characterized by, this piezo-electric electro-acoustic transducer also comprises the 3rd elastic component be arranged between this first elastic component and this second elastic component and at least one 3rd piezoelectric element being attached at the 3rd elastic component, 3rd elastic component has two ends in the longitudinal direction and the two sides in order to define thickness, the two ends of the two ends of the 3rd elastic component, the two ends of this first elastic component and this second elastic component engage, and this at least one 3rd piezoelectric element is attached at least one side on this two sides of the 3rd elastic component.
5. piezo-electric electro-acoustic transducer as claimed in claim 4, it is characterized by, this piezo-electric electro-acoustic transducer also comprises the 4th elastic component be arranged between the 3rd elastic component and this second elastic component and at least one 4th piezoelectric element being attached at the 4th elastic component, 4th elastic component has two ends in the longitudinal direction, formed towards the bending bend of this second direction between the two ends of the 4th elastic component, and in order to define the two sides of thickness, and this at least one 4th piezoelectric element is attached at least one on this two sides of the 4th elastic component, wherein, 3rd elastic component has the bend being formed between the two ends of the 3rd elastic component and bend towards this first direction, the two ends of the 4th elastic component, the two ends of the 3rd elastic component, the two ends of this second elastic component and the two ends of this first elastic component are for engaging, and the bend of the bend of the 4th elastic component and the 3rd elastic component is for separating.
6. piezo-electric electro-acoustic transducer as claimed in claim 1, it is characterized by, this piezo-electric electro-acoustic transducer also comprises:
Bearing part, for carrying this first elastic component and this second elastic component of engaging; And
Buffer body, it is arranged between this first elastic component and this bearing part and between this second elastic component and this bearing part, does not contact this bearing part to make this first elastic component with this second elastic component.
7. piezo-electric electro-acoustic transducer as claimed in claim 6, it is characterized by, this bearing part comprises the hollow box with opening and the film covering this opening, this second elastic component and this second piezoelectric element to be contained in this hollow box and to make this first elastic component and this first piezoelectric element expose to this opening, and this plastic film covering exposes outside the first elastic component of this opening to provide prestressing force to this first elastic component and this second elastic component.
8. piezo-electric electro-acoustic transducer as claimed in claim 7, it is characterized by, this thickness of this first elastic component and this thickness of this second elastic component are between 0.1mm-0.25mm, this distance is between 1mm-4mm, this prestressing force is between 10N-15N, and this thickness of this thickness and this second elastic component of adjusting this first elastic component can change vibration frequency and an oscillation intensity of this first elastic component and this second elastic component, the prestressing force that adjusting this vibrating diaphragm provides can change a vibration frequency of this first elastic component and this second elastic component.
9. piezo-electric electro-acoustic transducer as claimed in claim 1, it is characterized by, this first elastic component and this second elastic component respectively have length and width, and the length-width ratio of this length and this width is greater than 1.
10. piezo-electric electro-acoustic transducer as claimed in claim 1, it is characterized by, this piezo-electric electro-acoustic transducer is a kind of piezoelectric bone conduction transducer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW104211301 | 2015-07-14 | ||
| TW104211301U TWM512864U (en) | 2015-07-14 | 2015-07-14 | Piezoelectric electro-acoustic transducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204948349U true CN204948349U (en) | 2016-01-06 |
Family
ID=55015733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520566713.4U Expired - Fee Related CN204948349U (en) | 2015-07-14 | 2015-07-31 | Piezoelectric electroacoustic transducer |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN204948349U (en) |
| TW (1) | TWM512864U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106358130A (en) * | 2015-07-14 | 2017-01-25 | 德世股份有限公司 | Piezoelectric electroacoustic transducer |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI647387B (en) * | 2017-01-05 | 2019-01-11 | 研能科技股份有限公司 | Micro-fluid control device and piezoelectric actuator |
| TWI626374B (en) | 2017-01-05 | 2018-06-11 | 研能科技股份有限公司 | Micro-fluid control device |
-
2015
- 2015-07-14 TW TW104211301U patent/TWM512864U/en unknown
- 2015-07-31 CN CN201520566713.4U patent/CN204948349U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106358130A (en) * | 2015-07-14 | 2017-01-25 | 德世股份有限公司 | Piezoelectric electroacoustic transducer |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM512864U (en) | 2015-11-21 |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20160106 Termination date: 20180731 |