CN106358130A - Piezoelectric electroacoustic transducer - Google Patents
Piezoelectric electroacoustic transducer Download PDFInfo
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- CN106358130A CN106358130A CN201510463668.4A CN201510463668A CN106358130A CN 106358130 A CN106358130 A CN 106358130A CN 201510463668 A CN201510463668 A CN 201510463668A CN 106358130 A CN106358130 A CN 106358130A
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- piezoelectric element
- acoustic transducer
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- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
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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 invention is a piezoelectric bone conduction transducer.
Description
Technical field
The present invention 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 special using the electric energy of piezoelectric element and the conversion of mechanical energy
Property, under alternating voltage drives, make flat piezoelectric element produce deformation, activate whereby and be attached at pressure
Elastic component on electric device, and then push air to change the density distribution of air molecule, the distribution of this density
Gas molecule can transmit sound wave, produce sound press.
Another bone conduction earphone, that is, convert electrical energy into the mechanical vibration of different frequency, by the mankind
Skull, auditory nerve, to brain auditory center, thus allowing the mankind hear sound.This kind of bone conduction ear
The step that function saves many sound wave transmission, and sound wave also will not have influence on him because of spreading in atmosphere
People.
If however, by traditional type piezoelectric earphone as bond-conduction sound purposes when, the vibrational energy of elastic component
Although audition partially can be produced via bone conduction, also can push air simultaneously and produce sound,
That is, partial vibrational energy still can lead to sound to pass through air because of elastic component pile-up air
Conduct and leak.This is the undesirable thing of bone conduction earphone.
Therefore, how to overcome the problems referred to above, endeavour the target researched and developed for current those skilled in the art.
Content of the invention
For solving the many disadvantages of aforementioned prior art, the present invention provides a kind of piezo-electric electro-acoustic transducer, with
Reduce noise.
The piezo-electric electro-acoustic transducer of the present invention, comprising: the first elastic component, it has in the longitudinal direction
Two ends, be located at this first elastic component two ends between formed towards first direction bending bending section and in order to
Define the two sides of thickness；Second elastic component, it has two ends in the longitudinal direction, is located at this second bullet
Property part two ends between formed towards in contrast to this first direction second direction bending bending section and in order to
Define the two sides of thickness, the two ends of this second elastic component are engaged with the two ends of this first elastic component respectively,
And the sweep of the bending section of this second elastic component and this first elastic component is with a distance from one；At least one first
Piezoelectric element, it is attached at least one side on this two sides of this first elastic component, with this first elastic component
There is identical curvature；And at least one second piezoelectric element, it is attached at this two sides of this second elastic component
At least one side, to have identical curvature with this second elastic component, wherein, provide the signal of telecommunication give this
One and during the second piezoelectric element, this first and second piezoelectric element activating for this signal of telecommunication can drive respectively
This first and second elastic component vibrates.Additionally, the amplitude that this first elastic component vibrates towards this first direction is big
In the amplitude vibrated towards this second direction, and the amplitude that this second elastic component vibrates towards this second direction is more than
Towards the amplitude of this first direction vibration, and this first direction is the direction away from this second elastic component, and is somebody's turn to do
Second direction is the direction away from this first elastic component.
In addition, the one side of this second flexure strip neighbouring on this two sides of this first flexure strip be pasted with this first
Piezoelectric element, the one side of this first flexure strip neighbouring on this two sides of this second flexure strip be pasted with this second
Piezoelectric element, and when providing the identical signal of telecommunication to give this first and second piezoelectric element, this first bullet can be made
Property piece and this second flexure strip vibrate toward this first direction simultaneously, or vibrate toward this second direction simultaneously.
The piezo-electric electro-acoustic transducer of the present invention also includes bearing part, for carrying this first elasticity engaging
Part and this second elastic component；And buffer body, its be arranged between this first elastic component and this bearing part and
Between this second elastic component and this bearing part, so that this first elastic component does not contact this with this second elastic component
Bearing part；This bearing part includes the hollow box with opening and the thin film covering this opening, by this second
Elastic component and this second piezoelectric element are contained in this hollow box and make this first elastic component and this first piezoelectricity
Element exposes to this opening, and this thin film covers the first elastic component exposing outside this opening with to this first bullet
Property part provide prestressing force.
The piezo-electric electro-acoustic transducer of the present invention also includes being arranged between this first elastic component and this second elastic component
The 3rd elastic component and at least one the 3rd piezoelectric element being attached at the 3rd elastic component, the 3rd elastic component
There is two ends in the longitudinal direction and the two sides in order to define thickness, two ends of the 3rd elastic component, should
The two ends of the two ends of the first elastic component and this second elastic component engage, and this at least one the 3rd piezoelectric element
It is attached at least one side on this two sides of the 3rd elastic component.
The piezo-electric electro-acoustic transducer of the present invention also includes being arranged between the 3rd elastic component and this second elastic component
The 4th elastic component and at least one the 4th piezoelectric element being attached at the 4th elastic component, the 4th elastic component
There are two ends in the longitudinal direction, be located at and formed towards this second direction between the two ends of the 4th elastic component
The bending section of bending and the two sides in order to define thickness, and this at least one the 4th piezoelectric element is attached at this
At least one side on this two sides of the 4th elastic component, wherein, the 3rd elastic component has positioned at the 3rd elasticity
Form the bending section towards the bending of this first direction between the two ends of part, the two ends of the 4th elastic component, this
The two ends at the two ends of three elastic components, the two ends of this second elastic component and this first elastic component are to engage, and
The bending section of the 4th elastic component and the bending section of the 3rd elastic component are to separate.
Additionally, the piezo-electric electro-acoustic transducer of the present invention is a kind of piezoelectric bone conduction transducer.
Brief description
Fig. 1 a and Fig. 1 b is the axonometric chart of an embodiment of piezo-electric electro-acoustic transducer and the side-looking of the present invention
Figure；
Fig. 2 a is the schematic diagram of another embodiment of piezo-electric electro-acoustic transducer of the present invention；
Fig. 2 b is the schematic diagram of the another embodiment of piezo-electric electro-acoustic transducer of the present invention；
Fig. 3 is the generalized section of an embodiment of piezo-electric electro-acoustic transducer of the present invention；
Fig. 4 a- Fig. 4 c is the test result with embodiment 1 for the reference examples of piezo-electric electro-acoustic transducer of the present invention
Figure；
Fig. 5 a- Fig. 5 c is the test knot of the embodiment 1,2,3 and 4 of piezo-electric electro-acoustic transducer of the present invention
Fruit is schemed；
Fig. 6 a- Fig. 6 c is the test result of the embodiment 1,5 and 6 of piezo-electric electro-acoustic transducer of the present invention
Figure；And
Fig. 7 a- Fig. 7 c is the test knot of the embodiment 1,7,8 and 9 of piezo-electric electro-acoustic transducer of the present invention
Fruit is schemed.
Symbol description
21st, 23,25,27 elastic component
211st, 231,251,271 bending section
212nd, 232,252,272 end
21t, 23t, 25t, 27t, 21l, 23l face
22nd, 24,26,28 piezoelectric element
3 bearing parts
31 empty vans
310 openings
32 thin film
4 buffer bodies
A, b direction
D distance
T thickness.
Specific embodiment
Below by way of particular specific embodiment, embodiments of the present invention are described, those skilled in the art can
Understand other advantages and the effect of the present invention by disclosure herein easily.It should be clear that this specification
Structure depicted in institute's accompanying drawings, ratio, size etc., all only in order to coordinate description disclosure of that,
For understanding and the reading of those skilled in the art, it is not limited to the enforceable qualificationss of the present invention,
Therefore do not have technical essential meaning, the adjustment of the modification of any structure, the change of proportionate relationship or size,
Under not affecting the present invention effect that can be generated by and the purpose that can reach, all should still fall in institute of the present invention
In the range of disclosed technology contents obtain and can cover.
Refer to Fig. 1 a- Fig. 1 b, the piezo-electric electro-acoustic transducer of the present invention mainly includes two elastic component 21 He
23 and two piezoelectric elements 22 and 24 that are attached at each elastic component 21 and 23 respectively.
Elastic component 21 has bending section 211 and the two ends in the longitudinal direction being formed towards direction a bending
212, the other shapes that its shape can be for rectangle or substantive length-width ratio more than 1, such as ellipse etc..
Elastic component 21 have the thickness t that can be defined by two relative face 21t, can be by two relative faces
Length and width that 21l is defined, and this length is more than 1 with the length-width ratio of thickness.It should be noted that,
Direction a is the direction on the normal of elastic component 21 away from elastic component 23.
Elastic component 23 has bending section 231 and the two ends in the longitudinal direction being formed towards direction b bending
232, the other shapes that its shape can be for rectangle or substantive length-width ratio more than 1, such as ellipse etc..
Elastic component 23 have the thickness t that can be defined by two relative face 23t, can be by two relative faces
Length and width that 23l is defined, and this length is more than 1 with the length-width ratio of thickness.It should be noted that,
Direction b is the direction on the normal of elastic component 23 away from elastic component 21.
Elastic component 21 is identical with 23 structure, can be lamina or multilayer composite sheet, for example, be zinc up and down
Copper alloy and the three-layer composite board of middle folder pressure-sensing glue.
Additionally, the two ends 212 of elastic component 21 are engaged with the two ends 232 of elastic component 23 respectively, and bullet
The property bending section 211 of part 21 separates one apart from d, in other words, bullet with the bending section 231 of elastic component 23
Property part 21 and 23 between distance maximum between bending section 211 and 231, and the closer to elastic component 21
Two ends 212 and the two ends 232 of elastic component 23 taper into.Additionally, being all in elastic component 21 and 23
In rectangular example, the two sides 21l two sides 23l with elastic component 23 respectively of available elastic component 21
Engage to complete elastic component 21 and 23 combine.Described joint can be for example on the two sides of elastic component 21
It is coated with sticker on the 21l and two sides 23l of elastic component 23, then both are mutually bonded.
Piezoelectric element 22 be attached at the two sides 21t of elastic component 21 wherein one side, and with elastic component 21
There is identical curvature.Piezoelectric element 24 is attached at the wherein one side of the two sides 21t of elastic component 21, and
With elastic component 23, there is identical curvature.It should be noted that, although accompanying drawing of the present invention illustrates elastic component 21
Only it is pasted with piezoelectric element 22 when 21t (neighbouring elastic component 23 while), elastic component 23 only one side
23t (one side of neighbouring elastic component 21) is pasted with piezoelectric element 24, but when being embodied as, elastic component 21
Two sides 21t all can be pasted with piezoelectric element 22, the two sides 23t of elastic component 23 all can be pasted with piezoelectricity
Element 24.Additionally, piezoelectric element 22 is identical with 24, for example, it is all piezoelectric ceramics, pvdf or piezoelectricity
Composite braking device.
In addition, the preparation method of the elastic component of bending and piezoelectric element can for example, the sweeping bullet to a script
Property part force so that it is in temporary transient tabular, then insert in an internal mould for vacuum state, then will
One flat piezoelectric element is attached at this flat elastic component, releases the vacuum shape in this mould afterwards
State, so that this elastic component is replied as bending from tabular, then this piezoelectric element just can have and this bending
The elastic component identical curvature of shape.
Refering to Fig. 2 a, in an embodiment, the piezo-electric electro-acoustic transducer of the present invention may also include and is arranged at
Elastic component 25 between elastic component 21 and 23 and be attached at the piezoelectric element 26 on elastic component 25.Elasticity
Part 25 has two ends 252 and the two sides 25t in order to define thickness in the longitudinal direction, elastic component 25
In addition to the two ends 231 that its two ends 252 is two ends 212 with elastic component 21 and elastic component 23 engage,
Other positions are not contacted with elastic component 21 and 23.Piezoelectric element 26 can be attached at the two of elastic component 25
At least one side of face 25t.Elastic component 25 in present embodiment is tabular.
Refering to Fig. 2 b, in another embodiment, the piezo-electric electro-acoustic transducer of the present invention may also include setting
Elastic component 27 between elastic component 23 and 25 and be attached at the piezoelectric element 28 on elastic component 27.Bullet
Property part 27 have formed towards direction b bending bending section 271, be located at length direction on two ends 272,
And in order to define the two sides 27t of thickness, piezoelectric element 28 can be attached at the two sides 27t's of elastic component 27
At least one side.Fig. 2 b of the present invention only illustrates the neighbouring elastic component that piezoelectric element 22 is attached at elastic component 21
25 21t, piezoelectric element 26 be attached at elastic component 25 neighbouring elastic component 27 while 25t,
Piezoelectric element 28 is attached at one side 27t of neighbouring elastic component 25 of elastic component 27, piezoelectric element 24 pastes
Invest one side 23t of the neighbouring elastic component 27 of elastic component 23.Additionally, the two ends 272 of elastic component 27,
The two ends 212 at the two ends 252 of elastic component 25, the two ends 232 of elastic component 23 and elastic component 21 connect
Close, elastic component 25 has the bending section 257 being formed towards direction a bending, and the bending section of elastic component 27
271 are separated with the bending section 251 of elastic component 25.
According to Fig. 1 a- Fig. 2 b, the piezo-electric electro-acoustic transducer of the present invention mainly includes the elasticity that two ends engage
Part 21 and 23 and attach piezoelectric element 22 and 24 thereon respectively, and considering vibration or sound passes
In the case of leading, can between elastic component 21 and 23 one or more elastic components of design configurations and be attached at it
On one or more piezoelectric elements.Additionally, when configuring an elastic component, it can be tabular, and configures
During multiple elastic component, the preferably contrary elastic component of even number bending direction.
Refering to Fig. 3, in another embodiment, the piezo-electric electro-acoustic transducer of the present invention may include for holding
Carry the bearing part 3 of elastic component 21 and 23 that engages and between elastic component 21 and bearing part 3 and bullet
Buffer body 4 between part 23 and bearing part 3 for the property.Buffer body 4 is used for elastic component 21 He making to engage
23 not with bearing part 3 directly contact, and generally speaking can have viscosity, by the elastic component engaging 21
Two ends 212 and the two ends 232 of elastic component 23 be fixed on bearing part 3.Buffer body 4 such as uv is solid
Determine glue, sense micelle colloid, silica gel colloid or bipeltate body.
Bearing part 3 can be schemed for supporting the framework of bearing part of elastic component 21 and 23 engaging or such as
Inclusion shown in 3 has the hollow box 31 of opening 310 and the thin film 32 of cladding opening 310.Hollow box
31 elastic component 23 and piezoelectric element 24 can be contained in this hollow box 31 and make elastic component 21 and piezoelectricity
Element 22 exposes outside opening 310, and has tension force after thin film 32 drawn, is covered in from opening 310
On the elastic component 21 exposing outside, provide prestressing force with perseverance to elastic component 21 and piezoelectric element 22, in other words,
The thin film 32 with Horizontal Tension vertically forces in the bending section 211 of elastic component 21, becomes and is supplied to bullet
Property part 21 prestressing force so that elastic component 21 can reach preferably rebound effect, more increase toward direction a
Oscillation Amplitude.In addition, buffer body 4 may also be disposed on bending section and the hollow box 31 of elastomer 23
Between bottom surface, to avoid elastomer 23 to touch hollow box when vibrating.
When providing the signal of telecommunication respectively to piezoelectric element 22 and 24, such as alternating current, piezoelectric element 22
Stretched by the actuating of this signal of telecommunication with 24, and then drive elastic component 21 and 23 vibration.Specifically,
Refering to Fig. 1 a- Fig. 1 b, when piezoelectric element 22 stretches, elastic component 21 vibrates towards direction b；Piezoelectric element
During 22 contraction, elastic component 21 vibrates towards direction a；When piezoelectric element 24 stretches, elastic component 23 is towards side
To a vibration；And during piezoelectric element 24 contraction, elastic component 23 vibrates towards direction b.If certain piezoelectricity
When element 22 and 24 is attached at the not coplanar of elastic component 21 and 23, elastic component 21 and 23 also has not
It is same as aforesaid mode of vibration.Further, since elastic component 21 is towards direction a bending in structure,
This can hamper the flexible start of piezoelectric element 22, therefore elastic component 21 can produce when toward direction a vibration
Larger displacement and acceleration, and displacement when toward direction b vibration and acceleration are relatively small；
Similarly, because elastic component 23 is that this can hamper piezoelectric element towards direction b bending in structure
24 flexible start, therefore elastic component 23 can produce larger displacement and acceleration when toward direction b vibration
Degree, and displacement when toward direction a vibration and acceleration are relatively small.
In addition, piezoelectric element 22 can be attached at one side 21t of the neighbouring elastic component 23 of elastic component 21, pressure
Electric device 24 can be attached at one side 23t of the neighbouring elastic component 21 of elastic component 23, when to piezoelectric element
22 and 24 when providing the identical signal of telecommunication respectively, and elastic component 21 and elastic component 23 can be simultaneously toward direction a
Vibrate or vibrate toward direction b simultaneously.Whereby, elastic component 21 is toward direction a vibration so that direction b side
Air molecule distribution relatively dredge and produce negative relative, simultaneously elastic component 23 toward direction a vibrate to push
The air of direction a side makes air molecule be distributed closeer and produce malleation relatively；Or, elastic component 21
Toward direction b vibration with push the air of direction b side make air molecule be distributed closeer and produce relatively just
Pressure, elastic component 23 is toward direction b vibration so that the air molecule distribution of direction a side is relatively dredged and produced simultaneously
Raw negative relative.Consequently, it is possible to receive alternating current so that dynamic elasticity part 21 in piezoelectric element 22 and 24
The period vibrated with 23, the air between elastic component 21 and 23 is because of such one positive one negative pressure cancellation
And maintain substantially the same air molecule density.
Therefore, the specific embodiment of the piezo-electric electro-acoustic transducer of the present invention is piezoelectric bone conduction transducer,
Elastic component 21 or 23 executes bond-conduction sound in order to contact the skin of people, and elastic component 21 and 23 is respectively
Larger displacement amount and acceleration are had on direction a and direction b, therefore can strengthen and put on shaking on bone
The dynamic intensity with lifting conduction sound, in addition, elastic component 21 and 23 is respectively on direction b and direction a
Have less plus displacement and acceleration, therefore the air being pointed between elastic component 21 and 23 can be reduced
Extruding, along with elastic component 21 and 23 is simultaneously each other to elastic component 21 toward same direction vibration with cancellation
And the extruding of air between 23, more can maintain roughly the same atmospheric density, and then reduce sound through empty
The probability that gas conducts and leaks, can significantly eliminate noise whereby.Then, with table 1 and Fig. 4 a- Fig. 7 c
Illustrate the separating distance of two elastic components of the piezo-electric electro-acoustic transducer of the present invention, the thickness of each elastic component and
The vibration displacement amount (displacement) of the tension force of thin film and elastic component, acceleration of vibration (acceleration),
The relation of leakage sound press (leakage spl).The test condition of reference examples and embodiment 1-9 is: voltage 10
Vrms, it is placed at 10mm above artificial ear, measures the bending of elastic component centre using Laser rangefinder
The vibration displacement amount in portion and acceleration.Another measurement in silent room leaks sound press, and radio reception distance is set as
10cm.
It should be noted that, for example shown in Fig. 3, two elastic components are the piezo-electric electro-acoustic transducer of embodiment 1-9
, from having with a distance from one, respective two ends engage solid to have the buffer body of viscosity again for bending and its sweep
In hollow box；Two elastic components of reference examples are tabular, and its two ends does not engage but respectively to have
The buffer body of viscosity is fixedly arranged in hollow box, and all sites of two elastic components all separately have same distance.In
The size of empty van be 32mm × 7mm × 1.8mm, each piezoelectric element size be 25mm × 4mm ×
0.1mm, a width of 30mm × 5mm of length of each elastic component, and the thickness of each elastic component, two elastic components
Distance, thin film tension force as shown in table 1.
Table 1
Refering to table 1 and Fig. 4 a- Fig. 4 c, the difference of the piezo-electric electro-acoustic transducer between reference examples and embodiment 1
It is only that the shape of elastic component, as shown in fig. 4 a, the starting of oscillation frequency of the piezo-electric electro-acoustic transducer of embodiment 1
Rate in 120hz, about 37 μm of the Mean Oscillation displacement between low frequency 100～500hz；Review
The piezo-electric electro-acoustic transducer of reference examples play vibration frequency in 230hz, low frequency 100～500hz it
Between about 25 μm of Mean Oscillation displacement hence it is evident that compared with embodiment 1 be little.As shown in Figure 4 b, embodiment
The starting of oscillation acceleration of 1 piezo-electric electro-acoustic transducer occurs in frequency about 120hz, more than 0.9m/s2, low
Frequently the about 0.96m/s of the average acceleration between 100～500hz2；Review the piezo-electric electro-acoustic transducer of reference examples
Starting of oscillation acceleration occur in frequency about 230hz, about 0.7m/s2, between low frequency 100～500hz
Average acceleration about 0.6m/s2Hence it is evident that being little compared with embodiment 1.As illustrated in fig. 4 c, the pressure of embodiment 1
A vibration frequency about 120-130hz of electric electroacoustic transducer, the sound pressure level between low frequency 100～500hz is about
45db, gradually delays toward low frequency and increases to 50db；Review a vibration frequency of piezo-electric electro-acoustic transducer of reference examples about
230hz, the about 53db of the sound pressure level between low frequency 100～500hz, gradually increase to 68db toward low frequency evidence,
Substantially relatively embodiment 1 is big.
From Fig. 4 a- Fig. 4 c, forniciform elastic component, compared to flat elastic component, is provided that relatively
Big displacement and acceleration simultaneously have less spl, represent the piezo-electric electro-acoustic transducer of embodiment 1
The amplitude that two elastic components inwardly push air is less and amplitude that outwards vibrate bone is larger.It should be noted that,
So-called inwardly as two elastic components direction close to each other herein, and be outwards two elastic components and be located remotely from each other
Direction.Review reference examples piezo-electric electro-acoustic transducer two elastic components due to for tabular it is impossible to patch
Piezoelectric element attached thereto causes deformation to hinder, therefore is difficult to the amplitude suppressing to push air inwardly, leads to
There is larger spl.
Therefore, the electric energy receiving can be mainly converted into being passed by bone by the piezo-electric electro-acoustic transducer of the present invention
The vibrational energy led, compared to reference examples, only few person can be converted into the vibrational energy of aerial conduction.
Refering to table 1 and Fig. 5 a- Fig. 5 c, inquire into two elastic components separating distance be respectively 1mm, 2mm,
3m and 4mm is for the impact of vibration displacement amount, acceleration and sound pressure level.As shown in Figure 5 a, implement
The piezo-electric electro-acoustic transducer of example 1,2,3 and 4 play vibration frequency all in 120-130hz, each implement
The displacement curve distribution of example is close, but wherein, embodiment 1 (separating distance 2mm) and 3 (separating distances
Vibration displacement amount 3mm) is larger, up to more than 37 μm, and embodiment 2 (separating distance 1mm) and 4 (point
Separation is from 4mm) vibration displacement amount less.As shown in Figure 5 b, the accelerating curve distribution of each embodiment
Close, but wherein, the acceleration of embodiment 1 (separating distance 2mm) and 3 (separating distance 3mm) is larger,
Up to 1m/s2More than, and the acceleration of embodiment 2 (separating distance 1mm) and 4 (separating distance 4mm) is relatively
Little.From Fig. 5 a- Fig. 5 b, the displacement of elastic component and acceleration have corresponding relation.Then as schemed
Shown in 5c, the curve of the sound pressure level of each embodiment is in substantially smoothed curve, plays vibration frequency and is about
120-130hz, average spl, from the 60db of 100hz, extenuate as 45db, this has been pole when gradually toward high frequency
Quietly degree, the spl of especially 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 bending section of two elastic components has a preferred range.?
The separating distance of this described two elastic component more can be regarded as the flexibility of elastic component, for example, apart from 1mm when
Flexibility is less, apart from 4mm when flexibility larger.In addition, the too small elastic component of flexibility be provided that to
The prestressing force of piezoelectric element is just little, and the excessive elastic component of right flexibility easily becomes non-linear again, therefore two elasticity
The preferred range of the separating distance of the bending section of part is 1mm-4mm.
Refering to table 1 and Fig. 6 a- Fig. 6 c, inquire into membrane tension be respectively 10n, 15n and 20n for
The impact of vibration displacement amount, acceleration and sound pressure level.As shown in Fig. 6 a and Fig. 6 b, in each embodiment
Playing vibration frequency has and slightly changes, the vibration displacement amount of the piezo-electric electro-acoustic transducer of embodiment 1 (tension force is 15n)
, embodiment 6 (tension force be 20n) larger with acceleration is taken second place, embodiment 5 (tension force is 10n) is minimum.As
Fig. 6 c understands, each embodiment is all presented with relatively low spl in frequency 100-10000hz.
According to Fig. 6 a- Fig. 6 c, suitable membrane tension can help to the rebound effect of elastic component, mistake
The prestressing force that little membrane tension can bestow elastomer is just little, and only excessive membrane tension removes obvious change and presses
It is also possible to lead to the raising of the spl of leakage outside a vibration frequency of piezoelectric voltage transducer.Therefore, thin film
The preferred range of tension force is 10n-20n.
Refering to table 1 and Fig. 7 a- Fig. 7 c, inquire into elastic component thickness be respectively 0.1mm, 0.15mm,
0.2mm and 0.25mm is for the impact of vibration displacement amount, acceleration and leakage sound press.As Fig. 7 a and
Shown in Fig. 7 b, the piezoelectric voltage transducer of embodiment 7 (thickness is 0.1mm) can reach relatively low starting of oscillation frequency
Rate, about 50hz, displacement herein and acceleration respectively may be about 28 μm and 0.7m/s2, embodiment 1 (thickness
Spend for 0.15mm) vibration frequency that rises of piezoelectric voltage transducer improves to about 120-130hz, low frequency 100～
About 37 μm of Mean Oscillation displacement between 500hz, average acceleration about 0.96m/s2.As Fig. 7 c institute
Show, each embodiment is all presented with relatively low spl in frequency 100-10000hz.
According to Fig. 7 a- Fig. 7 c, a vibration frequency of elastic component can be controlled through the thickness adjusting elastic component
And oscillation intensity, blocked up elastic component is because rigidly too big may lead to too high spl.Therefore, elasticity
The preferred range of the thickness of part is 0.1mm-0.25mm.
In sum, the piezo-electric electro-acoustic transducer of the present invention mainly includes two two ends and engages and bending section
Separated two elastic components, two piezoelectric elements being attached at respectively on two elastic components, also include being covered in it
In thin film on an elastic component, the stress being had with being activated through electric signal by piezoelectric element, bending
The prestressed combined influence that the elastic force of elastic component, the tension force of thin film are provided is so that two elastic components are in court
Outer direction has larger vibration displacement amount and acceleration, can improve the intensity through bone conduction for the sound, separately
Direction inwardly has less vibration displacement amount and acceleration, can reduce internal air extrusion, and
The internal pressure energy produced by air when vibration of two elastic components cancels one another out, therefore substantially reduces air and pass
Sound caused by leading leaks, and reduces leakage sound press.Significantly reduce miscellaneous compared to traditional bone conductors earphone
Sound.
The effect of the above-mentioned embodiment only illustrative present invention, not for limiting the present invention, any
Those skilled in the art all can be without prejudice under the spirit and the scope of the present invention, to those embodiments above-mentioned
Modified and changed.Additionally, the number of the structure in those embodiments above-mentioned is only exemplary theory
Bright, it is not intended for use in the restriction present invention.Therefore the scope of the present invention, should be as claims institute
Row.
Claims (10)
1. a kind of piezo-electric electro-acoustic transducer, it is characterized by, this piezo-electric electro-acoustic transducer includes:
First elastic component, it has two ends in the longitudinal direction, between the two ends that are located at this first elastic component
Form the bending section towards first direction bending and the two sides in order to define thickness；
Second elastic component, it has two ends in the longitudinal direction, between the two ends that are located at this second elastic component
Formed towards the bending section of second direction bending in contrast to this first direction and the two sides in order to define thickness,
The two ends of this second elastic component are engaged with the two ends of this first elastic component respectively, and this second elastic component is curved
The sweep of pars convoluta and this first elastic component is with a distance from one；
At least one first piezoelectric element, it is attached at least one side on this two sides of this first elastic component, with
This first elastic component has identical curvature；And
At least one second piezoelectric element, it is attached at least one side on this two sides of this second elastic component, with
This second elastic component has identical curvature；
Wherein, when providing the signal of telecommunication to give this first and second piezoelectric element, activate for this signal of telecommunication this
One and second piezoelectric element can drive respectively this first and second elastic component vibrate.
2. piezo-electric electro-acoustic transducer as claimed in claim 1, it is characterized by, this first elastic component is towards this first party
It is more than the amplitude towards the vibration of this second direction to the amplitude of vibration, and this second elastic component shakes towards this second direction
Dynamic amplitude is more than the amplitude towards the vibration of this first direction, and this first direction is away from this second elastic component
Direction, 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, this two sides of this first flexure strip
The one side of this second flexure strip neighbouring is pasted with this first piezoelectric element, the neighbour on this two sides of this second flexure strip
The one side of this first flexure strip nearly is pasted with this second piezoelectric element, and provide the identical signal of telecommunication give this first
And during the second piezoelectric element, this first flexure strip can be made to shake toward this first direction with this second flexure strip simultaneously
Dynamic, or vibrate toward this second direction simultaneously.
4. piezo-electric electro-acoustic transducer as claimed in claim 1, it is characterized by, this piezo-electric electro-acoustic transducer also includes
The 3rd elastic component that is arranged between this first elastic component and this second elastic component and be attached at the 3rd elastic component
At least one the 3rd piezoelectric element, the 3rd elastic component has two ends in the longitudinal direction and in order to define thickness
The two sides of degree, the two ends at the two ends, the two ends of this first elastic component and this second elastic component of the 3rd elastic component
Engage, and this at least one the 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 includes
The 4th elastic component that is arranged between the 3rd elastic component and this second elastic component and be attached at the 4th elastic component
At least one the 4th piezoelectric element, the 4th elastic component has two ends in the longitudinal direction, is located at the 4th
Form the bending section towards the bending of this second direction and the two sides in order to define thickness between the two ends of elastic component,
And this at least one the 4th piezoelectric element is attached at least one of this two sides of the 4th elastic component, wherein, should
3rd elastic component has the bending being formed between the two ends of the 3rd elastic component towards the bending of this first direction
Portion, 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 this
The two ends of one elastic component are to engage, and the bending section of the bending section of the 4th elastic component and the 3rd elastic component
For separating.
6. piezo-electric electro-acoustic transducer as claimed in claim 1, it is characterized by, this piezo-electric electro-acoustic transducer also includes:
Bearing part, for carrying this first elastic component engaging and this second elastic component；And
Buffer body, it is arranged between this first elastic component and this bearing part and this second elastic component and this carrying
Between part, so that this first elastic component does not contact this bearing part with this second elastic component.
7. piezo-electric electro-acoustic transducer as claimed in claim 6, it is characterized by, this bearing part includes thering is opening
Hollow box and the thin film covering this opening, this second elastic component and this second piezoelectric element are contained in this
In empty van and make this first elastic component and this first piezoelectric element expose to this opening, and this thin film covers and exposes
The first elastic component going out this opening is 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 is between 0.1mm-0.25mm, and this distance is between 1mm-4mm
Between, this prestressing force is between 10n-15n, and adjust this thickness of this first elastic component and this
This thickness of two elastic components can change this first elastic component and a vibration frequency of this second elastic component and vibration is strong
Degree, the prestressing force adjusting the offer of this vibrating diaphragm can change the starting of oscillation frequency of this first elastic component and this second elastic component
Rate.
9. piezo-electric electro-acoustic transducer as claimed in claim 1, it is characterized by, this first elastic component and this second bullet
Property part respectively there is length and width, and this length is more than 1 with the length-width ratio of this width.
10. piezo-electric electro-acoustic transducer as claimed in claim 1, it is characterized by, this piezo-electric electro-acoustic transducer is one
Plant piezoelectric bone conduction transducer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW104122708A TWI589162B (en) | 2015-07-14 | 2015-07-14 | Piezoelectric electro-acoustic transducer |
| TW104122708 | 2015-07-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106358130A true CN106358130A (en) | 2017-01-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510463668.4A Pending CN106358130A (en) | 2015-07-14 | 2015-07-31 | Piezoelectric electroacoustic transducer |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN106358130A (en) |
| TW (1) | TWI589162B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108430016A (en) * | 2018-04-06 | 2018-08-21 | 西北工业大学 | A kind of closing cavate PVDF thin film loud speaker |
| CN109863761A (en) * | 2016-10-28 | 2019-06-07 | 索尼公司 | Electroacoustic transducer and electroacoustic transducer device |
| CN110012375A (en) * | 2019-03-01 | 2019-07-12 | 万魔声学科技有限公司 | A kind of phonation unit and earphone |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116939435A (en) * | 2022-04-01 | 2023-10-24 | 深圳市韶音科技有限公司 | Acoustic equipment |
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| EP1542499A2 (en) * | 2003-12-12 | 2005-06-15 | Nec Tokin Corporation | Acoustic vibration generating element |
| US20070057601A1 (en) * | 2005-09-09 | 2007-03-15 | Nec Tokin Corporation | Piezoelectric device for generating acoustic signal |
| CN102334347A (en) * | 2009-01-20 | 2012-01-25 | 索尼图斯医疗公司 | Dental bone conduction hearing appliance |
| DE102009014770A1 (en) * | 2009-03-25 | 2010-09-30 | Cochlear Ltd., Lane Cove | vibrator |
| US20120088957A1 (en) * | 2009-06-09 | 2012-04-12 | Dalhousie University | Subcutaneous piezoelectric bone conduction hearing aid actuator and system |
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| CN109863761A (en) * | 2016-10-28 | 2019-06-07 | 索尼公司 | Electroacoustic transducer and electroacoustic transducer device |
| CN109863761B (en) * | 2016-10-28 | 2020-12-01 | 索尼公司 | Electroacoustic transducer and electroacoustic transducer device |
| CN108430016A (en) * | 2018-04-06 | 2018-08-21 | 西北工业大学 | A kind of closing cavate PVDF thin film loud speaker |
| CN108430016B (en) * | 2018-04-06 | 2020-04-03 | 西北工业大学 | Closed cavity type PVDF film loudspeaker |
| CN110012375A (en) * | 2019-03-01 | 2019-07-12 | 万魔声学科技有限公司 | A kind of phonation unit and earphone |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201703548A (en) | 2017-01-16 |
| TWI589162B (en) | 2017-06-21 |
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