CN104094612B - Acoustic generator, acoustic generation device, and electronic apparatus - Google Patents
Acoustic generator, acoustic generation device, and electronic apparatus Download PDFInfo
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- CN104094612B CN104094612B CN201380006514.1A CN201380006514A CN104094612B CN 104094612 B CN104094612 B CN 104094612B CN 201380006514 A CN201380006514 A CN 201380006514A CN 104094612 B CN104094612 B CN 104094612B
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- pendulum
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- covering part
- sound generator
- damping piece
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- 239000000463 material Substances 0.000 claims abstract description 23
- 239000012190 activator Substances 0.000 claims description 19
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 230000037237 body shape Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
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- 239000004925 Acrylic resin Substances 0.000 description 1
- 229910000906 Bronze Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241000222712 Kinetoplastida Species 0.000 description 1
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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- 230000033228 biological regulation Effects 0.000 description 1
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- 239000010974 bronze Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
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- 239000004615 ingredient Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 description 1
- 229910052451 lead zirconate titanate Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
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- 239000010959 steel Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
- H04R17/10—Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
- H04R1/2811—Enclosures comprising vibrating or resonating arrangements for loudspeaker transducers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Abstract
The present invention provides an acoustic generator, wherein it is possible to improve sound quality and to inhibit the frequency fluctuation of a sound pressure as much as possible by reducing the difference between the oscillation peak and dip in the frequency characteristics of the sound pressure. The present invention also provides an acoustic generation device and an electronic apparatus. An acoustic generator of one mode is provided with a vibrating body, an exciter disposed on the vibrating body, a cover part covering the exciter, and a damping material integrated with the vibrating body, the exciter, and the cover part. The damping material is formed from a material that has a lower elastic modulus than the cover part.
Description
Technical field
Disclosed embodiment is related to sound generator, sound generation device and electronic equipment.
Background technology
Previously known to be, the sound generator using piezoelectric speaker as representative can be used as small-sized and slim speaker
Use.Involved sound generator can be used as the electronic equipment being loaded into headed by portable telephone, slim TV etc.
Speaker and use.
As sound generator, for example, exist possess pendulum, be arranged on the pendulum piezoelectric vibration device sound equipment
Generator (referring for example to patent documentation 1).It is to vibrate pendulum by piezoelectric vibration device and using the resonance of pendulum
There is the structure of sound in phenomenon.
【Citation】
【Patent documentation】
Patent documentation 1：Japanese Unexamined Patent Publication 2004-23436 publications
The content of the invention
【The invention problem to be solved】
But, as above-mentioned sound generator, occurring in the structure of sound press by the resonance of pendulum itself, can
Because of the difference of resonance crest and trough (between the peak-to-peak trough of resonance wave) in the frequency characteristic of sound press the frequency of sound press can be caused to become
It is dynamic.And, it may interfere with tonequality raising.
One mode of embodiment in view of above-mentioned problem and complete, its object is to, there is provided sound press can be reduced
The difference of resonance crest and trough in frequency characteristic and suppress the frequency variation of sound press as much as possible, so that the sound of tonequality raising
Ring generator, sound generation device and electronic equipment.
【Means for solving the problems】
Sound generator involved by one mode of embodiment possesses：Pendulum；The excitation being arranged on the pendulum
Device；The covering part that the activator is covered；With the damping of the pendulum, the activator and the covering integrally
Part.The damping piece is made up of the material low with the covering part resilience in comparison modulus.
And, the sound generation device involved by a mode of embodiment at least possesses：Above-mentioned sound generator；Should
The casing of sound generator storage.
Additionally, the electronic equipment involved by a mode of embodiment at least possesses：Above-mentioned sound generator；With the sound equipment
The electronic circuit of generator connection；The casing that the electronic circuit and the sound generator are received, the electronic equipment tool
There is the function that sound equipment occurs from the sound generator.
【Invention effect】
Sound generator, sound generation device and electronic equipment according to a mode of embodiment, can reduce sound
In the frequency characteristic of pressure resonance crest and trough difference and suppress the frequency variation of sound press as much as possible, so that tonequality is carried
It is high.
Description of the drawings
Figure 1A is the diagrammatic top view of the sound generator involved by embodiment.
Figure 1B is A-A ' the line sectional views of Figure 1A.
Fig. 2 is the block diagram of the sound generation device involved by embodiment.
Fig. 3 is the block diagram of the electronic equipment involved by embodiment.
Specific embodiment
Hereinafter, with reference to addition accompanying drawing, sound generator disclosed in the present application, sound generation device and electronics are described in detail
The embodiment of equipment.It should be noted that the present invention is not limited to embodiments described below.
Figure 1A is showing from the sound generator 1 involved by the observation embodiment in direction vertical with the interarea of pendulum 10
Meaning top view, Figure 1B is A-A ' the line sectional views of Figure 1A.It should be noted that for convenience of description, scheme in Figure 1A and Figure 1B
Shown comprising with vertical upwards as positive direction and with the three-dimensional cartesian coordinate system of vertical Z axis downwards as negative direction.And,
In fig. ib, represent in order to make it easy to understand, sound generator 1 is exaggerated into deformation in above-below direction (Z-direction).
As shown in Figure 1A and 1B, the sound generator 1 involved by embodiment possesses pendulum 10, multiple piezoelectricity and shakes
Dynamic element 20, framework 30.Involved sound generator 1 is referred to as so-called piezoelectric speaker, using pendulum 10 itself
Covibration and there is sound press.
It should be noted that as shown in Figure 1A, in the present embodiment, possess 2 piezoelectricity exemplified with sound generator 1 to shake
The situation of dynamic element 20, but the number of piezoelectric vibration device 20 is not limited to this, or 1 or more than 3.And
And, in the present embodiment, 2 piezoelectric vibration devices 20 are set to into substantially same shape and are illustrated.
Pendulum 10 can be formed using the various materials such as resin, metal, paper.For example, can be by 10～200 μm of thickness
The resin film of polyethylene, polyimides, polypropylene etc. constitutes laminal pendulum 10.Because resin film is and metallic plate
The material low etc. the Q-value of resilience in comparison modulus and machinery, therefore by being made up of pendulum 10 resin film, vibration can be made
Body 10 is vibrated with larger amplitude flexing, and the amplitude for making the resonance crest in the frequency characteristic of sound press expands, and makes height reduction, from
And reduce the difference of resonance crest and trough.It should be noted that with regard to pendulum 10 elastic modelling quantity (such as Young's moduluss) E and
Speech, according to metal 30～400GPa or so is then formed as, and according to resin 0.2～10GPa or so is then formed as.
Piezoelectric vibration device 20 by the applying of voltage for by being vibrated the activator for thus carrying out excited vibration body 10, example
Such as the laminated piezoelectric vibrating elementss of bimorph type.Thus, due to activator be piezoelectric vibration device 20, therefore with use
Coil can be set to slim compared with the activator etc. of the electromagnetic type of Magnet such that it is able to be set to sound generator 1 thin
Type.And, piezoelectric vibration device 20 is the bimorph type vibrated with element (with an element) flexing itself, therefore is adapted to
Laminal pendulum 10 is vibrated, the violent oscillatory motion of pendulum 10 is made such that it is able to which high sound press occurs.
Specifically, as shown in Figure 1B, piezoelectric vibration device 20 possesses：Duplexer 21；It is formed in the upper table of duplexer 21
The surface electrode layer 22,23 of face and lower surface；Being formed in the derivation of duplexer 21 has the side of end face of interior electrode layer 24
Outer electrode 25,26.And, it is connected with guide terminal 27a, 27b in outer electrode 25,26.
Duplexer 21 for example with it is alternately laminated be made up of ceramics four be laminated in electrics layer 28a, 28b, 28c, 28d and three layers
The mode of portion's electrode layer 24 is formed.And, for piezoelectric vibration device 20, the interarea of upper surface side and lower face side is set
It is set to rectangular-shaped, piezoelectric body layer 28a, 28b and piezoelectric body layer 28c, 28d alternant polarization on thickness direction (Z-direction) respectively.
Therefore, in the case where voltage is applied with to piezoelectric vibration device 20 by guide terminal 27a, 27b, for example, with
Such a way deform, i.e. the lower face side of piezoelectric vibration device 20 in other words the side of pendulum 10 piezoelectric body layer 28c, 28d receive
Contracting, on the other hand, piezoelectric body layer 28a, 28b of upper surface side extend.Thus, the piezoelectricity of the upper surface side of piezoelectric vibration device 20
Body layer 28a, 28b represents contrary expanding-contracting action with piezoelectric body layer 28c, 28d of lower face side, and its result is that piezoelectric vibration is first
Part 20 carries out the flexing vibration of bimorph type, and sound occurs thus, it is possible to impose constant vibration to pendulum 10.
Herein, as the material for constituting piezoelectric body layer 28a, 28b, 28c, 28d, lead zirconate titanate (1ead can be used
Zirconate titanate), Bi lamellar compounds, the non-lead system piezoelectrics material such as tungsten bronze construction compound etc. used in the past
Piezoelectric ceramics.
Also, it is preferred that the material of interior electrode layer 24 contain by silver and the metal ingredient that constitutes of palladium with constitute piezoelectric body layer
The material composition of 28a, 28b, 28c, 28d.By making interior electrode layer 24 containing composition piezoelectric body layer 28a, 28b, 28c, 28d
Ceramic component, can be reduced because of the thermal expansion of piezoelectric body layer 28a, 28b, 28c, 28d and interior electrode layer 24,24,24
The piezoelectric vibration device 20 of the stress that difference is caused.
And, as the distribution being connected with guide terminal 27a, 27b, in order to realize the low clearance of piezoelectric vibration device 20
Change, and preferably use the flexible distribution of the metal forming that copper or aluminum etc. are clipped by resin film.
The piezoelectric vibration device 20 for constituting by this way is arranged on pendulum 10.Specifically piezoelectric vibration device 20
The vibration plane 10a of pendulum 10 is engaged with by the junction surface 40 formed by bonding agent.Piezoelectric vibration device 20 and vibration
The thinner thickness at the junction surface 40 between body 10, for example, be arranged on less than 20 μm.Thus, junction surface 40 thickness be 20 μm with
In the case of lower, easily the vibration of duplexer 21 can be transmitted to pendulum 10.
As the bonding agent for forming junction surface 40, for example can be using public affairs such as epoxy system resin, silicones, polyester based resins
The material known, but it is not limited to this.And, as the hardening of resin method that bonding agent is used, it is possible to use heat is hard
Any one method such as change, photo-hardening, anaerobies hardening.
Framework 30 plays a part of to keep pendulum 10 and form the fixing end vibrated.For example, though diagram is omitted, can be with
The framework 30 in the interior ring-type for being shaped as ellipse is taken to be pasted with the construction of pendulum 10 or be shaped as polygonal ring interior
The framework 30 of shape is pasted with the construction of pendulum 10.Additionally, as shown in Figure 1B, interior shape can also be it is polygon-shaped, specifically
For, for example, it is also possible to be that framework 30 is made up of rectangular-shaped frame member 30a and lower frame component 30b, and by frame member
30a and lower frame component 30b is bonded on the upper and lower construction of pendulum 10.And, frame member 30a and lower frame component 30b it
Between sandwich the peripheral part of pendulum 10, be fixed with the state for giving the tension force T10 for having regulation.Therefore, possess even if becoming
The sound generator 1 of the also less pendulum 10 of deformation such as life-time service bending.
It should be noted that will positioned at the part compared with framework 30 in the inner part be in pendulum 10 in pendulum 10
Do not clamped by framework 30 and be capable of the part of free vibration as vibration plane 10a.Therefore, vibration plane 10a is the inframe of framework 30
The part for becoming polygon-shaped specifically such as substantially rectangular shape.
Constitute the thickness and material of the frame member 30a and lower frame component 30b of framework 30 and be not particularly limited,
However, in the present embodiment, set out the reasons why intensity and corrosion resistance excellent based on machinery, for example, can use thickness
The materials such as 100～5000 μm of glass, ceramics, plastics, rustless steel.
And, in sound generator 1, as shown in Figure 1B, the vibration plane 10a of piezoelectric vibration device 20 and pendulum 10
Covered by the covering part 50 as resin.Specifically, covering part 50 is infusing resin into the frame of the frame member 30a of framework 30
It is interior and make its hardening and the mode of the coverings such as piezoelectric vibration device 20 is constituted.It should be noted that in figure ia, for the ease of
Understand, covering part 50 is represented with having an X-rayed, and represent piezoelectric vibration device 20, the vibration of pendulum 10 that coating cap 50 is covered
Face 10a.
The resin for forming covering part 50 is, for example, epoxy system resin, acrylic resin, silicon system resin, rubber etc., but
These are merely illustrative and are not limited to this.And, elastic modelling quantity (such as Young's moduluss) E50 of covering part 50 is less than with becoming
The value of the elastic modulus E 10 of pendulum 10, the mode for for example becoming 0.01～0.5GPa is formed.Thus, by by covering part 50
Piezoelectric vibration device 20 is covered, appropriate damping can be produced such that it is able to suppress covibration and will can resonate
The difference of crest and trough be suppressed to it is less, therefore preferably.It is further possible to protect piezoelectric vibration device 20 not by external environment condition
Affect.
However, the difference of the resonance crest and trough in the frequency characteristic of sound press is reduced by above-mentioned covering part 50, so
And in the present embodiment, also pendulum 10 is given in the face side of covering part 50 by the way that damping piece described later 60 is configured
The mechanical vibration loss produced by damping piece 60, further to reduce the difference of resonance crest and trough.
But, in the case of involved, if such as elastic modelling quantity of damping piece 60 is more than the elastic modelling quantity of covering part 50
E50, then damping piece 60 is possible hinders from pendulum 10 to the vibration of the surface of covering part 50 transmission.In other words, it is likely to result in resistance
Damping member 60 reduces the amplitude of vibration and causes sound press to reduce in frequency whole region.
In this regard, in the present embodiment, by constituting damping piece 60 by the material lower than the elastic modelling quantity of covering part 50, come
The difference of resonance crest and trough in the sound press for maintaining frequency whole region and the frequency characteristic for reducing sound press.Say below
The bright damping piece 60.
Go on to say Figure 1A and Figure 1B, the state that covering part 50 is set as, i.e. hard with above-mentioned resin
Change, be stretched to the side of framework 30 and produce tension force T50.The tension force T50 of the covering part 50 is set to less than aforesaid pendulum
The value of 10 tension force T10.Specifically, the tension force T10 of such as pendulum 10 is 1～100N, and the tension force T50 of covering part 50 is
0.05～10N.As the assay method of above-mentioned tension force, for example, tonometer is pressed against into measurement site and is measured.That is,
Tonometer is pressed against into each portion (covering part 50, damping piece 60, pendulum 10 (lower surface)) of sound generator 1, and in each portion
Between there is the magnitude relationship of tension force.
Herein, the probe of tonometer is pressed against into position that pendulum 10 exposes to determine the tension force T10 of pendulum 10.
And, covering part 50, damping piece 60 are similarly measured by the way that tonometer to be pressed against the position exposed.This
When, in the case that in covering part 50, damping piece 60, tension force is little compared with pendulum 10, by the shadow of the big pendulum 10 of tension force
Ring, therefore measured value represents for the time being steady state value when the probe of tonometer sinks to covering part 50, damping piece 60, and further will visit
The impact of body vibrated 10 when pin is pressed into so that measured value persistently rises to the value of the tension force of pendulum 10 and can not show perseverance
Fixed value.In this regard, by the way that the probe of tonometer is sunk to into covering part 50, damping piece 60, and with measured value performance steady state value
Value determine tension force.
It should be noted that in the sound generator 1 involved by present embodiment, the vibration plane 10a of pendulum 10 is complete
The coating cap 50 in portion is covered, but need not be by whole coverings.That is, for sound generator 1, piezoelectricity is covered by covering part 50
Vibrating elementss 20, be provided with the piezoelectric vibration device 20 pendulum 10 vibration plane 10a at least local and in covering part
The tensioned T50 of 50 effects.And, as the hardening of resin method that covering part 50 is used, it is possible to use thermmohardening, light
Any one method such as hardening, moisture-curable.
Sound generator 1 is also equipped with multiple damping pieces 60.It should be noted that exemplified with 5 damping pieces 60 in Figure 1A etc.,
But damping piece 60 is not limited to the number.
Damping piece 60 is for example formed approximately parallelepiped body shape.But, the shape of the damping piece 60 shown in Figure 1A etc. is only
Approximately parallelepiped body shape is not limited to for example.As shown in Figure 1B, damping piece 60 is installed in and is covered by bonding agent 61
The surface of cap 50, so as to integrated with pendulum 10, piezoelectric vibration device 20 and covering part 50.In other words, covering part 50
Be configured between pendulum 10 and damping piece 60, pendulum 10, piezoelectric vibration device 20, covering part 50 and damping piece 60 with into
The mode being integrated is engaged.
Bonding agent 61 for example can be using the known material such as epoxy system resin, silicones, polyester based resin, but not
It is defined in this.And, the method for curing of bonding agent 61 can be using any one methods such as thermmohardening, photo-hardening, moisture-curables.
For example, as shown in Figure 1A, damping piece 60 is configured with 2 in the way of the short side direction (X-direction) along framework 30
It is individual.And, damping piece 60 is matched somebody with somebody in the vicinity of piezoelectric vibration device 20 in the way of the length direction (Y direction) along framework 30
It is equipped with 2.Additionally, damping piece 60 is configured with 1 in the way of being located between 2 piezoelectric vibration devices 20.It should be noted that
The configuration of damping piece 60 is shown in Figure 1A etc., but it is only one and is not defined to configuring place.
Damping piece 60 is made up of the material low with the resilience in comparison modulus of covering part 50 (such as Young's moduluss).For example, damp
Part 60 can be formed using various elastomers, and because soft deformable material is preferred, therefore, it is possible to using polyurethane rubber
The elastomeric materials such as glue are forming.Particularly, can suitably using the elastomeric material of the Porous such as polyurethane foam.For example, damp
The elastic modulus E 60 of part 60 to become 0.0001～0.05GPa less than the elastic modulus E 50 of covering part 50 in the way of formed
(that is, E60 ＜ E50).
Herein, for the elastic modelling quantity of damping piece 60 and covering part 50, damping piece 60 is peeled off simultaneously from covering part 50
And covering part 50 is cut into after the size same with damping piece 60 is measured by tension test.
And, in the case of the little degree that can not extremely carry out tension test of test film taken out, for example, can also pass through
Resonance method, ultrasound impulse method, determined using the method etc. of penetration hardness testing machine.
Additionally, simply relatively in the case of the size of elastic modelling quantity, by being surveyed by atomic force microscope (AFM)
Determining apparent condition also can be compared.
Thus, the damping piece 60 of covering part 50 is less than by using elastic modelling quantity, thus with the configuration place of damping piece 60
The region of the vibration plane 10a of corresponding pendulum 10 receives the vibration loss based on damping piece 60 by covering part 50, so as to
Suppress covibration.
And, the vibration that the surface of covering part 50 is transferred to from pendulum 10 is difficult to damped part 60 and hinders, therefore, it is possible to
The sound press of frequency whole region is maintained, and the crest shape of the sound press of the resonant frequency of pendulum 10 can be made steady.Thus,
The difference of resonance crest and trough (between the peak-to-peak paddy of resonance wave) in the frequency characteristic of sound press can be reduced and suppress sound as far as possible
The frequency variation of pressure, so that tonequality is improved.Particularly, the frequency characteristic of sound press of high range can be made be close to flat, in detail
Say, the resonance crest in the high range for easily becoming ear-piercing sound can be reduced, therefore, it is possible to obtain good tonequality, from
Sound equipment angle considers also highly advantageous.
And, as described above, covering part 50 is configured between pendulum 10 and damping piece 60.Therefore, sound generator 1 with
With from pendulum 10 away from and the mode that arranges the low material of elastic modelling quantity is configured.Specifically, match somebody with somebody on pendulum 10
The little covering part 50 of modular ratio pendulum 10 is equipped with, modular ratio covering part 50 is configured with covering part 50 little
Damping piece 60.Thus, the vibration of pendulum 10 is difficult to coating cap 50, damping piece 60 and hinders, and can be effectively reduced and shake
The crest of the sound press in the resonant frequency of kinetoplast 10, therefore, it is possible to further reduce sound press frequency characteristic in resonance crest with
The difference of trough.
And, for sound generator 1, damping piece 60 is configured with the covering part 50 for covering pendulum 10, because
This causes the different material of sound equipment impedance to overlap.Therefore, it is possible in the interface of covering part 50 and damping piece 60 increase resonance crest
Decay such that it is able to more effectively reduce pendulum 10 resonant frequency in sound press crest.
And, damping piece 60 is set to less than the tension force T60 (that is, T60 ＜ T50) of the tension force T50 of covering part 50.Specifically
For, due to by damping piece 60 to be positioned in the surface of covering part 50 in the way of install, hence in so that the tension force T60 of damping piece 60
Become minimum, such as value near 0N or 0N.
If thus, the tension force T60 of damping piece 60 less than covering part 50 tension force T50, in the vibration system of sound generator 1
Damping piece 60 is not as spring in system, and the effect played a role as quality increases.Thereby, it is possible to further decay sound press
The resonance crest of the treble side in frequency characteristic such that it is able to reduce the difference of resonance crest and trough and suppress sound press as far as possible
Frequency variation, so that tonequality is improved.
As described above, in sound generator 1, because damping piece 60 is by the material low with the resilience in comparison modulus of covering part 50
Constitute, suppress the frequency of sound press to become as far as possible therefore, it is possible to the difference of the resonance crest in the frequency characteristic for reducing sound press and trough
It is dynamic, so that tonequality is improved.
And, as shown in Fig. 2 can be constituted by the way that the sound generator 1 of said structure is accommodated in resonance chamber 200
Sound generation device 2.Resonance chamber 200 for storage sound generator 1 casing, make acoustic resonance that sound generator 1 sends and
Radiated as sound wave from casing face.Involved sound generation device 2 except can as speaker be used alone in addition to,
For example, it is also possible to suitably load various electronic equipments 3.
As noted previously, as resonance crest and the trough in the frequency characteristic of sound press unfavorable in piezoelectric speaker can be made
Difference reduce, therefore the sound generator 1 involved by present embodiment can suitably load portable telephone, slim TV or handss
Write the electronic equipments such as board terminal 3.
It should be noted that as the electronic equipment 3 that can become the object for loading sound generator 1, being not limited to
Aforesaid portable telephone, slim TV or hand-written board terminal etc., for example, also comprising electric refrigerator, microwave oven, vacuum cleaner, laundry
Such household appliances for not paying attention to tonequality in the past such as machine.
Herein, possesses the electronic equipment 3 of above-mentioned sound generator 1 with reference to Fig. 3 simple declarations.Fig. 3 is electronic equipment 3
Block diagram.Electronic equipment 3 possesses the electronic circuit of above-mentioned sound generator 1 and the connection of sound generator 1, storage sound equipment and occurs
The casing 300 of device 1 and electronic circuit.
Specifically, as shown in figure 3, electronic equipment 3 possesses comprising control circuit 301, signal processing circuit 302, conduct
The radio-circuit 303 of input equipment is in interior electronic circuit, antenna 304, the casing 300 for receiving them.It should be noted that
Illustrate in Fig. 3 based on wireless input equipment, but also can be set to certainly based on the signal input of common electric wiring.
It should be noted that herein, omit other electronic components for electronic equipment 3 possesses (for example, display,
The equipment such as mike, speaker, circuit) description.And, in figure 3, exemplified with a sound generator 1, but also can
Plural sound generator 1, other transmitters are set.
It is overall that control circuit 301 controls the electronic equipment 3 comprising radio-circuit 303 by signal processing circuit 302.From
Signal processing circuit 302 is input into the output signal to sound generator 1.And, control circuit 301 will be defeated to radio-circuit 303
The signal for entering, audio signal S is generated by control signal process circuit 302, and sound generator 1 is exported.
Thus, the electronic equipment 3 shown in Fig. 3 loads small-sized and slim sound generator 1, and reduce the crest that resonates
And the difference of trough and suppress frequency variation as far as possible, not only also can realize in the low bass zone of frequency but also in treble region
The raising of tonequality, i.e. the raising of overall sound quality can be realized.
It should be noted that in figure 3, as sound equipment outut device exemplified with being directly equipped with sound generator 1
Electronic equipment 3, but as sound equipment outut device, for example, can also be to be equipped with that sound generator 1 is accommodated in casing
The structure of sound generation device 2.
And, in the above-described embodiment, by piezoelectric vibration device 20 configure pendulum 10 vibration plane 10a it is same
Simultaneously go up, but two sides can also be configured in.And, piezoelectric vibration device 20 is set to into the shape of the rectangular shape of top view
Shape, but can also be square.And, it is configured with piezoelectricity and shakes exemplified with the substantial middle of the vibration plane 10a in pendulum 10
The structure of dynamic element 20, but can also be in the position of the vibration plane 10a off-centrings from pendulum 10 configuration piezoelectric vibration unit
Part 20.
And, it is illustrated by taking Young's moduluss as an example as the elastic modelling quantity of covering part 50, damping piece 60, but and
It is not limited to this, or represent the numerical value of other elastic modelling quantity such as rigidity modulus, bulk modulus.
And, the vibration plane 10a of pendulum 10 is set to rectangular-shaped, but its is merely illustrative and is not limited to this,
For example can also be it is rectangular-shaped beyond polygon-shaped, circular, oval etc. other shapes.That is, the shape of framework 30 is accurate
Say framework 30 inframe (inner edge) shape can be it is for example rectangular-shaped beyond it is polygon-shaped, circular, oval etc. other
Shape.
And, in the above description, to illustrate and constitute framework 30 by two frames component 30a, 30b and by involved two
Frame component 30a, 30b sandwich and support pendulum 10 peripheral part situation, but be not limited to this.For example, it is also possible to
Framework 30 is constituted by a frame component, the peripheral part of pendulum 10 is adhesively fixed on into involved framework 30 and vibration is supported
The peripheral part of body 10.
And, as piezoelectric vibration device 20, and exemplified with the cascade type of so-called bimorph type, but also can
Using the piezoelectric vibration device of unimorph type.
And, enumerate activator and be illustrated for the situation of piezoelectric vibration device 20, but as activator, not
Piezoelectric vibration device is defined in, as long as the component of the function of vibrating with input electric signal.For example, it is also possible to be
The activator of the activator of known galvanic electricity type, the activator of electrostatic, electromagnetic type as the activator for making loudspeaker vibration.
It should be noted that the activator of galvanic electricity type to the coil streaming electric current being configured between the magnetic pole of permanent magnet to make coil shake
Dynamic such activator, the activator of electrostatic makes metal to bias to aspectant two metallic plate streamings with electric signal
Activator as panel vibration, to make to coil streaming electric signal, sheet iron vibration is such to encourage the activator of electromagnetic type
Device.
Those skilled in the art can easily derive further effect, variation.Therefore, broader reality of the invention
The mode of applying is not limited to the specific details for as above representing and describing and representational embodiment.Therefore, not
Depart from claims of addition scope and can in the concept purport of invention or scope by its equivalent being all together of defining
Carry out various changes.
【Symbol description】
1 sound generator
2 sound generation devices
3 electronic equipments
10 pendulums
20 piezoelectric vibration devices
30 frameworks
40 junction surfaces
50 covering part
60 damping pieces
200 resonance chambers (casing)
300 casings
301 control circuits
302 signal processing circuits
303 radio-circuits
304 antennas
Claims (4)
1. a kind of sound generator, it is characterised in that possess：
Pendulum；
The activator engaged with the vibration plane of the pendulum；
The covering part that the activator is covered and covers at least a portion of the vibration plane of the pendulum；
With the damping piece of the pendulum, the activator and the covering integrally,
The covering part is made up of the material low with the pendulum resilience in comparison modulus, the damping piece by with the covering part
The low material of resilience in comparison modulus is constituted,
The damping piece is installed on the surface of the covering part, the covering part be configured in the pendulum and the damping piece it
Between.
2. sound generator as claimed in claim 1, it is characterised in that
Damping piece tension force compared with the covering part is little.
3. a kind of sound generation device, it is characterised in that at least possess：
Sound generator described in claim 1 or 2；
By the casing of the sound generator storage.
4. a kind of electronic equipment, it is characterised in that at least possess：
Sound generator described in claim 1 or 2；
The electronic circuit being connected with the sound generator；
The casing that the electronic circuit and the sound generator are received,
The electronic equipment has the function that sound equipment occurs from the sound generator.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012217362 | 2012-09-28 | ||
| JP2012-217362 | 2012-09-28 | ||
| PCT/JP2013/073456 WO2014050439A1 (en) | 2012-09-28 | 2013-08-31 | Acoustic generator, acoustic generation device, and electronic apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104094612A CN104094612A (en) | 2014-10-08 |
| CN104094612B true CN104094612B (en) | 2017-04-26 |
Family
ID=50387848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380006514.1A Expired - Fee Related CN104094612B (en) | 2012-09-28 | 2013-08-31 | Acoustic generator, acoustic generation device, and electronic apparatus |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP5677636B2 (en) |
| CN (1) | CN104094612B (en) |
| WO (1) | WO2014050439A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111988700B (en) * | 2020-06-30 | 2022-03-25 | 联想(北京)有限公司 | Electronic equipment and method for fixing audio output equipment |
| CN113709624B (en) * | 2021-08-27 | 2023-05-23 | 江苏铁锚玻璃股份有限公司 | Method for improving surface sounding distortion based on calcium carbonate material and surface sounding component |
| JP7543546B2 (en) * | 2022-03-17 | 2024-09-02 | シェンツェン・ショックス・カンパニー・リミテッド | Audio output device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4654554A (en) * | 1984-09-05 | 1987-03-31 | Sawafuji Dynameca Co., Ltd. | Piezoelectric vibrating elements and piezoelectric electroacoustic transducers |
| CN1214605A (en) * | 1997-04-15 | 1999-04-21 | 株式会社村田制作所 | Speaker |
| WO2011162002A1 (en) * | 2010-06-25 | 2011-12-29 | 京セラ株式会社 | Acoustic generator |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8670578B2 (en) * | 2008-03-07 | 2014-03-11 | Nec Corporation | Piezoelectric actuator and electronic device |
-
2013
- 2013-08-31 JP JP2014531446A patent/JP5677636B2/en not_active Expired - Fee Related
- 2013-08-31 WO PCT/JP2013/073456 patent/WO2014050439A1/en active Application Filing
- 2013-08-31 CN CN201380006514.1A patent/CN104094612B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4654554A (en) * | 1984-09-05 | 1987-03-31 | Sawafuji Dynameca Co., Ltd. | Piezoelectric vibrating elements and piezoelectric electroacoustic transducers |
| CN1214605A (en) * | 1997-04-15 | 1999-04-21 | 株式会社村田制作所 | Speaker |
| WO2011162002A1 (en) * | 2010-06-25 | 2011-12-29 | 京セラ株式会社 | Acoustic generator |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2014050439A1 (en) | 2014-04-03 |
| JPWO2014050439A1 (en) | 2016-08-22 |
| JP5677636B2 (en) | 2015-02-25 |
| CN104094612A (en) | 2014-10-08 |
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