CN1905760A - Piezoelectric loudspeaker - Google Patents
Piezoelectric loudspeaker Download PDFInfo
- Publication number
- CN1905760A CN1905760A CNA2005100855373A CN200510085537A CN1905760A CN 1905760 A CN1905760 A CN 1905760A CN A2005100855373 A CNA2005100855373 A CN A2005100855373A CN 200510085537 A CN200510085537 A CN 200510085537A CN 1905760 A CN1905760 A CN 1905760A
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- Prior art keywords
- piezo
- sound wave
- framework
- electric loudspeaker
- perforate
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- 239000012190 activator Substances 0.000 claims description 24
- 230000008676 import Effects 0.000 claims description 23
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 16
- 229910052451 lead zirconate titanate Inorganic materials 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 14
- 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 claims description 12
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical group C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 claims description 8
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 claims description 8
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 239000011787 zinc oxide Substances 0.000 claims description 8
- 238000001746 injection moulding Methods 0.000 claims description 5
- 229920000728 polyester Polymers 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 235000013351 cheese Nutrition 0.000 claims description 3
- 239000011152 fibreglass Substances 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims 2
- QNZFKUWECYSYPS-UHFFFAOYSA-N lead zirconium Chemical compound [Zr].[Pb] QNZFKUWECYSYPS-UHFFFAOYSA-N 0.000 claims 2
- 210000003660 reticulum Anatomy 0.000 description 11
- 230000004044 response Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 241001503991 Consolida Species 0.000 description 6
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 240000001439 Opuntia Species 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000003141 lower extremity Anatomy 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R27/00—Public address systems
- H04R27/04—Electric megaphones
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
- B06B1/0603—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a piezoelectric bender, e.g. bimorph
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
- G10K9/122—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using piezoelectric driving means
-
- 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
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
- H04R1/025—Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Mechanical Engineering (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Abstract
This invention relates to a piezoelectric loudspeaker to generate sound wave transmitting to the external space, and improve sound pressure standard and useable frequency range through combining sound wave channels which have resonant cavity with space resonant frequency and increased cross-sectional area. The sound wave channel has an inlet and an outlet, in which, the inlet links the opening of the resonant cavity. The outlet leads to the external space which cross-sectional area increases from the inlet to the outlet. The sound wave from resonant cavity enters into the sound wave channel through the opening and the external space followed. The resonant cavity connects and compresses air to generate sound wave by dint of mechanical deformation from piezoelectric actuator. The wave is amplified by resonance in the cavity, and then transmits to the channel external space through wave channel.
Description
Technical field
The present invention relates to a kind of loud speaker, particularly relate to a kind of piezo-electric loudspeaker.
Background technology
Piezo-electric loudspeaker (piezoelectric loudspeakers) is a kind of loud speaker that utilizes piezoelectric element (piezoelectric elements) as the driving thrust source of sound wave, can be used to produce the sound wave of the frequency range that common people's ear can receive.General piezoelectric element can be piezoelectric ceramic piece, when the input voltage signal enters upper and lower two surfaces of piezoelectric element by little and the earth, because the cause of piezoelectric effect, piezoelectric element will produce mechanical deformation radially, and then the flexural deformation that produces above-below direction, cause the shape of piezoelectric element to become convex surface by the plane; When the input voltage signal was reverse, the shape of piezoelectric element then was transformed into concave surface, and for the effect that further makes mechanical deformation enlarges, can affix sheet metal on the surface of piezoelectric element usually.In addition, also piezoelectric element can be affixed dull and stereotyped or conical vibrating diaphragm (diaphragm), with this vibrating diaphragm as sounding component.
Generally be applied to outdoor loud speaker, as alarm, blow a whistle and outdoor radio etc., on functional requirement, want to send very high sound press, and the frequency range of certain width will be arranged.Yet, common piezoelectric speaker mostly has higher sound press performance in the frequency range of a little width, perhaps present height and change the accurate frequency response curve in great sound press position, can't produce very high and consistent sound press in wider frequency (as 2 KHz～5 KHz).And for sending higher sound press output, piezoelectric speaker must improve in order to the input voltage that drives, and also needs the bigger transformer of volume to carry out voltage transitions accordingly, so the volume of piezoelectric speaker also increases thereupon.
In order in the frequency range of certain width, to produce higher sound press, of the 4th, 979, No. 219 patents of the U.S., proposed to contain the piezoelectric speaker of bugle (horn) of can amplifying, this bugle is made of the sound wave channel of curved surface or wave-like.Cross as this patent disclosure, after sound was sent by sounding component (being made up of piezoelectric element and plate shaped vibrating diaphragm), entering above-mentioned sound wave channel through throat (throat) can improve sound press position standard because of resonance effect.Yet, by the accurate frequency response curve in sound press position of its measurement as can be known, in 1500 to 4000 hertz frequency range, its curve presents the mountain peak shape, its peak value is positioned at about 3000 hertz and is about 100 decibels (dB), and so the result can learn thus, and the sound press that is produced in its frequency range is widely different.
And the U.S.'s the 5th, 751,827 patents have also been utilized the principle of bugle, and the sound that sounding component (being piezoelectric element) is sent imports a spiral-shaped sound wave channel, again with sound by the sound wave dissemination channel to extraneous sound field.Because the sound wave channel of device is continued to increase to the crosspiece area sound outlet by voice entry, therefore can produce quite wide frequency range and high sound press position standard.By the accurate frequency response curve result in its sound press position that shows as can be known, it can provide wider frequency (about 450 hertz to 20000 hertz), but its curve presents significantly zigzag, and vibration reaches more than 20 decibels (dB) up and down.And this design apparatus volume reaches 94 * 72 * 20 millimeters (mm) approximately, and is too huge.
Summary of the invention
In view of above common technical problem, the invention discloses a kind of piezo-electric loudspeaker, utilization has the resonant cavity of space resonance frequency and the sound wave channel that sectional area increases progressively, resonant cavity is engaged a piezo-activator, rely on the mechanical deformation compressed air of its generation to send sound wave, and make sound wave in resonant cavity, produce resonance and amplify, enter sound wave channel then with acoustic impedance matching effect, so, utilize less drive voltage signal can make the piezo-electric loudspeaker generation have the sound wave of advantages such as high sound press position standard and wide frequency ranges.
Piezo-electric loudspeaker involved in the present invention, by the sound wave channel, have the resonant cavity of a perforate, and the piezo-activator that is engaged in resonant cavity forms, and piezo-activator is in order to providing mechanical force, and then drives resonant cavity compressed air and send sound wave.The sound wave channel has an import and an outlet, and import is connected in the perforate of resonant cavity, exports then conducting in outside sound field, makes sound wave enter the sound wave channel by perforate, then enters outside sound field, and the cross-sectional area of sound wave channel is increased progressively by import to outlet.Wherein, sound wave can resonate and amplifies in resonant cavity, and the sound wave channel that cross-sectional area increases progressively has the acoustic impedance matching feature of bugle effect, so leave at last sound wave that the sound wave channel enters outside sound field on the frequency response curve except sound press is amplified, also have the effect of extending toward low frequency.
On the other hand, piezo-electric loudspeaker disclosed in this invention conducts to outside sound field in order to produce sound wave, and can include: a framework has perforate; One protecgulum, be fixed in the top of framework, make between the upper surface of the lower surface of protecgulum and framework and constitute the sound wave channel, this sound wave channel has import and outlet, import is connected in perforate, export then conducting in outside sound field, protecgulum has conoid protuberance in the face of the framework centre, and the cross-sectional area of sound wave channel is increased progressively by import to outlet; One bonnet, the lower edge of framework engage with this bonnet and form cavity; One vibrating diaphragm is arranged in the cavity, and the outstanding limit of vibrating diaphragm is connected with framework to form air chamber, and air chamber and perforate constitute resonant cavity jointly, also are separated out air chamber between vibrating diaphragm and the bonnet; One piezo-activator is engaged in vibrating diaphragm so that mechanical force to be provided, and then drives this vibrating diaphragm compressed air and send sound wave, makes sound wave through entering the sound wave channel by perforate again after the resonant cavity resonance, then enters outside sound field.
On the other hand, piezo-electric loudspeaker disclosed in this invention conducts to outside sound field in order to produce sound wave, can include: a framework, and its central authorities have a perforate, and have the outer rim that an above borehole is symmetrically distributed in this framework; One protecgulum, be fixed in the top of framework, make between the upper surface of the lower surface of protecgulum and framework and constitute the sound wave channel, this sound wave channel has import and outlet, import is connected in perforate, export then conducting in outside sound field, protecgulum has conoid protuberance in the face of the framework centre, and the cross-sectional area of sound wave channel is increased progressively by import to outlet; One bonnet, the lower edge of framework engage with this bonnet and form cavity; One vibrating diaphragm is arranged in the cavity, and the outstanding limit of vibrating diaphragm is connected with framework to form air chamber, and air chamber and perforate constitute resonant cavity jointly, also are separated out air chamber between vibrating diaphragm and the bonnet; One piezo-activator is engaged in vibrating diaphragm so that mechanical force to be provided, and then drives this vibrating diaphragm compressed air and send sound wave, makes sound wave through entering the sound wave channel by perforate again after the resonant cavity resonance, then enters outside sound field.
The air chamber that provides sound wave to produce resonance is provided resonant cavity, and forms an opening in air chamber sound wave is spread out of through opening, because the design of air chamber and opening thereof will produce a space resonance frequency f
c:
Wherein, C is the velocity of sound, and S is the cross-sectional area of perforate, and L ' is the effective length of perforate, and V is the volume of resonant cavity.The very important point is in the present invention, and sound wave is during through resonant cavity and perforate because be subjected to space resonance effect, and on the accurate frequency response curve in sound press position in resonance frequency f
cNear, can see the phenomenon that great sound amplifies.Because the combination of piezo-activator and vibrating diaphragm also has a mechanical resonance frequency f
s, on the accurate frequency response curve in sound press position in resonance frequency f
sNear high sound press position standard also can appear.Sound wave enters the sound wave channel by perforate, then enters outside sound field.And the cross-sectional area of sound wave channel is increased progressively by import to outlet.Therefore, along with the increase of radius, the area that sound passes through also increases thereupon, so the sound wave channel possesses the function that bugle the is arranged acoustic impedance of (horn) is mated.In order to make the sound wave energy that leaves perforate enter the sound wave channel smoothly, the starting altitude of sound wave channel is preferably at least greater than 1/4th of perforate internal diameter.Because the sound wave channel has the acoustic impedance matching feature of bugle, on frequency response curve, have the effect of extending toward low frequency so leave the sound of sound wave channel.Therefore the present invention can be by resonance frequency f
c, resonance frequency f
sWith the design of this sound wave channel size etc., develop high sound press position standard, light and handy and piezo-electric loudspeaker, and volume is less with frequency range of certain width.
Description of drawings
Fig. 1 is the generalized section of the present invention's first preferred embodiment;
Fig. 2 A is the vertical view of the present invention's second preferred embodiment, and Fig. 2 B is for prolonging the profile of I-I line among Fig. 2 A;
Fig. 3 is the accurate frequency response curve in sound press position of the embodiment of the invention.
Wherein, Reference numeral:
100 framework 102a boreholes
102b borehole 102c borehole
110 resonant cavities, 111 cylindrical aperture
112 air chambers, 120 conjugate foramens
200 bonnets, 210 vibrating diaphragms
220 sheet metals, 221 piezoelectric patches
300 protecgulums, 310 conoid protuberances
320 short columns
Embodiment
For purpose of the present invention, structure, feature and function thereof are had further understanding, existing conjunction with figs. is described in detail as follows:
Fig. 1 is the generalized section of the present invention's first preferred embodiment.This loud speaker is the axial symmetry device, has comprised framework 100, protecgulum 300, bonnet 200, vibrating diaphragm 210 and piezo-activator with cylindrical aperture 111.The upper surface of framework has three conjugate foramens 120 and a curved surface; Protecgulum is the top of being fixed in framework 100 with short column as conjugative component, the lower limb of framework 100 is to engage with solid with bonnet 200 to form a cavity, vibrating diaphragm 210 is arranged in the cavity with piezo-activator, and the outstanding limit of vibrating diaphragm 210 is connected with framework 100 to form air chamber 112, this air chamber 112 and cylindrical aperture 111 common formation one resonant cavities 110, piezo-activator then is engaged in vibrating diaphragm 210, and resonant cavity 110 conductings also are separated out another air chamber in the cylindrical aperture 111 of framework 100 between resonant cavity 110 and the bonnet 200.
As shown in Figure 1, protecgulum 300 utilizes 3 short columns 320 to be connected with framework 100, and 3 short columns 320 are to be positioned on the same circumference, inserts to be fixed in the conjugate foramen 120 of framework 100 upper surfaces.Constitute a sound wave channel between the upper surface of the lower surface of protecgulum 300 and framework 100, the sound wave channel has import and outlet, import is connected in cylindrical aperture 111, export then conducting in outside sound field, protecgulum 300 has a conoid protuberance 310 especially in the face of the centre of framework, the position of conoid protuberance 310 is corresponding to the centre of cylindrical aperture 111, its summit is not less than the upper surface of cylindrical aperture 111, the cross-sectional area of sound wave channel is increased progressively by import to outlet, must notice that the starting altitude of its sound wave channel is more preferably greater than 1/4th of cylindrical aperture 111 internal diameters.When piezo-activator receives voltage signal, then produce flexural deformation up and down so that mechanical force to be provided, and then drive vibrating diaphragm 210 compressed air and send sound wave, and via resonant cavity 110 voice emplifyings; Sound wave enters the sound wave channel by cylindrical aperture 111 then, then enters outside sound field.
On the other hand, see also Fig. 2 A and Fig. 2 B.Fig. 2 A is the vertical view of the present invention's second preferred embodiment, and Fig. 2 B is for prolonging the profile of I-I line among Fig. 2 A.
Second preferred embodiment and the first preferred embodiment difference are that it is prolonging framework 100 outer rims, and borehole 102a, 102b, 102c are being symmetrically distributed.Though wherein the icon person is three boreholes, the actual number of borehole and position can be adjusted arbitrarily in symmetric form under the prerequisite that does not influence frequency.
The related piezo-activator of preferred embodiment of the present invention is made up of sheet metal 220 and two piezoelectric patches 221, and the polarised direction of two piezoelectric patches 221 is identical.Sheet metal 220 upper and lower surfaces are fitted piezoelectric patches 221 respectively to constitute piezo-activator; Wherein, the upper and lower surface of two piezoelectric patches all scribbles electrode (not shown) as thin as a wafer, and the lower surface electrode of the surface electrode of top piezoelectric patches and below piezoelectric patches is connected to each other with lead.And the center of the upper surface electrode of piezo-activator and rubber-like vibrating diaphragm 210 are fixed together.In addition, piezo-activator also can directly use piezoelectric patches or utilize the arrange in pairs or groups piezoelectric patches of different numbers of sheet metal.
Piezoelectric patches generally uses piezoelectric ceramic piece, availablely make such as lead zirconate titanate (PZT), lead zirconate titanate (PLZT), zinc oxide materials such as (ZnO), but with the PZT that possesses high mechanical-electric coupling efficient is good, and in the time of must note using a plurality of piezoelectric patches, its polarised direction needs identical.Vibrating diaphragm is then by the made of elastically deformable, such as with highdensity plastic material acrylonitrile-butadiene-styrene copolymer (ABS), polyester (polyester) etc., and also can use the vibrating diaphragm of multiple shape, as conical, plate shaped, cheese etc.Framework, bonnet and protecgulum must adopt rigid structural member basically, also are difficult for producing distortion when piezo-activator vibrates.The material of this rigid structural member can be selected the plastic material of high rigidity for use, adds Merlon (PC) as the acrylonitrile-butadiene-styrene copolymer (ABS) with combined fiberglass, utilizes the mode of plastics injection molding to be shaped again.
Fig. 3 is a preferred embodiment of the accurate frequency response curve in sound press of the present invention position, and the apparent size of piezoelectric speaker is: diameter 54mm, overall height 30mm; During measurement, driving voltage is the square-wave signal of 34Vp-p, and measuring microphone is 100 centimeters to the piezoelectric speaker sound outlet.The sound press position standard that shows the embodiment of the invention in 2.3 to 7.0 khz frequency scopes by Fig. 3 is all greater than 100 decibels (dB), locates even greater than 112.4 decibels (dB) at 2720 hertz.Therefore, of the present inventionly show the piezoelectric speaker that obtains high sound press position standard and wide frequency ranges with low driving voltage really, and had littler volume.
Though preferred embodiment of the present invention is openly as mentioned above, this is not in order to qualification the present invention, any those of ordinary skill in the art, and without departing from the spirit and scope of the present invention, change of being done and retouching all belong to scope of patent protection of the present invention.Scope of patent protection of the present invention must with this specification appending claims the person of being defined be as the criterion.
Claims (33)
1. a piezo-electric loudspeaker conducts to an outside sound field in order to produce a sound wave, it is characterized in that, includes:
One resonant cavity has a perforate and an air chamber;
One sound wave channel has an import and an outlet, and this import is connected in this perforate of this resonant cavity, and this exports then conducting in this outside sound field, and the cross-sectional area of this sound wave channel increases progressively from this import to this outlet;
One piezo-activator is engaged in this resonant cavity so that mechanical force to be provided, and then compresses the air in this resonant cavity and send a sound wave, makes this sound wave enter this sound wave channel by this perforate, then enters this outside sound field.
2. piezo-electric loudspeaker as claimed in claim 1 is characterized in that wherein the starting altitude of this sound wave channel is greater than 1/4th of the perforate internal diameter.
3. piezo-electric loudspeaker as claimed in claim 1 is characterized in that, wherein this sound wave channel has a conoid protuberance in the face of the centre of this perforate, and the summit of this conoid protuberance is not less than the upper surface of this opening.
4. piezo-electric loudspeaker as claimed in claim 1 is characterized in that, wherein this piezo-activator is a piezoelectric patches.
5. piezo-electric loudspeaker as claimed in claim 1 is characterized in that, wherein the material of this piezoelectric patches is to be selected from a kind of in lead zirconate titanate, lead zirconate titanate and the zinc oxide.
6. piezo-electric loudspeaker as claimed in claim 1 is characterized in that, wherein this piezo-activator is that a sheet metal has attached more than one piezoelectric patches.
7. piezo-electric loudspeaker as claimed in claim 6 is characterized in that, wherein the material of this piezoelectric patches is to be selected from a kind of in lead zirconate titanate, lead zirconate titanate and the zinc oxide.
8. a piezo-electric loudspeaker conducts to an outside sound field in order to produce a sound wave, it is characterized in that, includes:
One framework has a perforate;
One protecgulum, be fixed in the top of this framework, make between the upper surface of the lower surface of this protecgulum and this framework and constitute a sound wave channel, this sound wave channel has an import and an outlet, this import is connected in this perforate, this exports then conducting in this outside sound field, and this protecgulum makes the cross-sectional area of this sound wave channel be increased progressively by this import to this outlet in the face of the centre of this framework has a conoid protuberance;
One bonnet, the lower edge of this framework engages with this bonnet, forms a cavity;
One vibrating diaphragm is arranged in this cavity, and the outstanding limit of this vibrating diaphragm is connected with this framework to form an air chamber, and the common formation of this air chamber and this perforate one resonant cavity also is separated out an air chamber between this vibrating diaphragm and this bonnet;
One piezo-activator is engaged in this vibrating diaphragm so that mechanical force to be provided, and then drives this vibrating diaphragm compressed air and send a sound wave.Make this sound wave through entering this sound wave channel by this perforate again after this resonant cavity resonance, then enter this outside sound field.
9. piezo-electric loudspeaker as claimed in claim 8 is characterized in that the starting altitude of this sound wave channel is greater than 1/4th of the perforate internal diameter.
10. piezo-electric loudspeaker as claimed in claim 8 is characterized in that, this protecgulum has a conoid protuberance in the face of the centre of this framework, and the position of this conoid protuberance is corresponding to the centre of this perforate, and the summit of this conoid protuberance is not less than the upper surface of this perforate.
11. piezo-electric loudspeaker as claimed in claim 8 is characterized in that, this piezo-activator is a piezoelectric patches.
12. piezo-electric loudspeaker as claimed in claim 11 is characterized in that, the material of this piezoelectric patches is to be selected from a kind of in lead zirconate titanate, lead zirconate titanate and the zinc oxide.
13. piezo-electric loudspeaker as claimed in claim 8 is characterized in that, this piezo-activator is that a sheet metal has attached more than one piezoelectric patches.
14. piezo-electric loudspeaker as claimed in claim 13 is characterized in that, the material of this piezoelectric patches is to be selected from a kind of in lead zirconate titanate, lead zirconate titanate and the zinc oxide.
15. piezo-electric loudspeaker as claimed in claim 8 is characterized in that, the shape of this vibrating diaphragm is selected from a kind of in taper shape, the plate shaped and cheese.
16. piezo-electric loudspeaker as claimed in claim 8 is characterized in that, the material of this vibrating diaphragm is selected from Acrylonitrile-butadiene-styrene Copolymer and polyester.
17. piezo-electric loudspeaker as claimed in claim 8 is characterized in that, this vibrating diaphragm is to make in the injection molding mode.
18. piezo-electric loudspeaker as claimed in claim 8 is characterized in that, this framework, this bonnet and this protecgulum are rigid structural member.
19. piezo-electric loudspeaker as claimed in claim 8 is characterized in that, the material of this framework, this bonnet and this protecgulum is the composite material that the Acrylonitrile-butadiene-styrene Copolymer of combined fiberglass adds Merlon.
20. piezo-electric loudspeaker as claimed in claim 8 is characterized in that, this framework, this bonnet and this protecgulum are to make in the injection molding mode.
21. a piezo-electric loudspeaker conducts to an outside sound field in order to produce a sound wave, it is characterized in that, includes:
One framework has a perforate and is positioned at central authorities, and has more than one borehole, is symmetrically distributed in the outer rim of this framework;
One protecgulum, be fixed in the top of this framework, make between the upper surface of the lower surface of this protecgulum and this framework and constitute a sound wave channel, this sound wave channel has an import and an outlet, this import is connected in this perforate, this exports then conducting in this outside sound field, and this protecgulum has a conoid protuberance in the face of this framework centre, and the cross-sectional area of this sound wave channel is increased progressively by this import to this outlet;
One bonnet, the lower edge of this framework engage with this bonnet and form a cavity;
One vibrating diaphragm is arranged in this cavity, and the outstanding limit of this vibrating diaphragm is connected with this framework to form an air chamber, and the common formation of this air chamber and this perforate one resonant cavity also is separated out an air chamber between this vibrating diaphragm and this bonnet;
One piezo-activator is engaged in this vibrating diaphragm so that mechanical force to be provided, and then drives this vibrating diaphragm compressed air and send a sound wave, makes this sound wave through entering this sound wave channel by this perforate again after this resonant cavity resonance, then enters this outside sound field.
22. piezo-electric loudspeaker as claimed in claim 21 is characterized in that, the starting altitude of this sound wave channel is greater than 1/4th of the perforate internal diameter.
23. piezo-electric loudspeaker as claimed in claim 21 is characterized in that, this protecgulum has a conoid protuberance in the face of this framework centre, and the position of this conoid protuberance is corresponding to the centre of this perforate, and the summit of this conoid protuberance is not less than the upper surface of this perforate.
24. piezo-electric loudspeaker as claimed in claim 21 is characterized in that, this piezo-activator is a piezoelectric patches.
25., it is characterized in that a kind of in material selected among zirconium lead titanates, lead zirconate titanate and the zinc oxide of this piezoelectric patches as 24 described piezo-electric loudspeakers of claim the.
26., it is characterized in that this piezo-activator is that a sheet metal attaches more than one piezoelectric patches as 21 described piezo-electric loudspeakers of claim the.
27., it is characterized in that a kind of in material selected among zirconium lead titanates, lead zirconate titanate and the zinc oxide of this piezoelectric patches as claim 26 a described piezo-electric loudspeaker.
28., it is characterized in that a kind of in conical, the plate shaped and cheese of being shaped as of this vibrating diaphragm as claim 21 a described piezo-electric loudspeaker.
29., it is characterized in that the material of this vibrating diaphragm is selected from Acrylonitrile-butadiene-styrene Copolymer and polyester as claim 21 a described piezo-electric loudspeaker.
30., it is characterized in that this vibrating diaphragm is made in the injection molding mode as claim 21 a described piezo-electric loudspeaker.
31., it is characterized in that this framework, this bonnet and this protecgulum are rigid structural member as claim 21 a described piezo-electric loudspeaker.
32., it is characterized in that the Acrylonitrile-butadiene-styrene Copolymer that this framework, this bonnet and this preceding cover material are combined fiberglass adds the composite material of Merlon as claim 21 a described piezo-electric loudspeaker.
33., it is characterized in that this framework, this bonnet and this protecgulum are made in the injection molding mode as claim 21 a described piezo-electric loudspeaker.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100855373A CN1905760A (en) | 2005-07-27 | 2005-07-27 | Piezoelectric loudspeaker |
| KR1020050092058A KR20070013974A (en) | 2005-07-27 | 2005-09-30 | Piezoelectric loudspeaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100855373A CN1905760A (en) | 2005-07-27 | 2005-07-27 | Piezoelectric loudspeaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1905760A true CN1905760A (en) | 2007-01-31 |
Family
ID=37674847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005100855373A Pending CN1905760A (en) | 2005-07-27 | 2005-07-27 | Piezoelectric loudspeaker |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR20070013974A (en) |
| CN (1) | CN1905760A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103152681A (en) * | 2013-03-29 | 2013-06-12 | 中国电子科技集团公司第三研究所 | Piezoelectric ceramic transducer |
| CN103220605A (en) * | 2012-01-20 | 2013-07-24 | 新昌有限公司 | Vibrating type horn |
| CN104219608A (en) * | 2014-09-15 | 2014-12-17 | 精拓丽音科技（北京）有限公司 | Modulation type piezoelectric loudspeaker, loudspeaker system and control method thereof |
| CN106792403A (en) * | 2017-01-09 | 2017-05-31 | 苏州攀特电陶科技股份有限公司 | Piezoelectric loudspeaker |
| CN111711899A (en) * | 2020-06-22 | 2020-09-25 | 武汉华星光电技术有限公司 | Display panel |
| CN113891223A (en) * | 2020-07-02 | 2022-01-04 | 知微电子有限公司 | Package structure and method for manufacturing sounding chip, package structure and sounding instrument |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200200696Y1 (en) * | 1998-01-30 | 2000-11-01 | 노임숙 | Piezoelectric speaker |
| KR100554874B1 (en) * | 2004-01-02 | 2006-02-24 | (주)오리엔트텔레콤 | Piezoelectric speaker |
| KR100634445B1 (en) * | 2004-06-25 | 2006-10-16 | 박병윤 | piezoelectric speaker |
-
2005
- 2005-07-27 CN CNA2005100855373A patent/CN1905760A/en active Pending
- 2005-09-30 KR KR1020050092058A patent/KR20070013974A/en not_active Application Discontinuation
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103220605A (en) * | 2012-01-20 | 2013-07-24 | 新昌有限公司 | Vibrating type horn |
| CN103152681A (en) * | 2013-03-29 | 2013-06-12 | 中国电子科技集团公司第三研究所 | Piezoelectric ceramic transducer |
| CN103152681B (en) * | 2013-03-29 | 2015-07-01 | 中国电子科技集团公司第三研究所 | Piezoelectric ceramic transducer |
| CN104219608A (en) * | 2014-09-15 | 2014-12-17 | 精拓丽音科技（北京）有限公司 | Modulation type piezoelectric loudspeaker, loudspeaker system and control method thereof |
| CN104219608B (en) * | 2014-09-15 | 2018-08-10 | 精拓丽音科技（北京）有限公司 | A kind of modulation type piezoelectric speaker, speaker system and its control method |
| CN106792403A (en) * | 2017-01-09 | 2017-05-31 | 苏州攀特电陶科技股份有限公司 | Piezoelectric loudspeaker |
| CN111711899A (en) * | 2020-06-22 | 2020-09-25 | 武汉华星光电技术有限公司 | Display panel |
| CN111711899B (en) * | 2020-06-22 | 2021-06-22 | 武汉华星光电技术有限公司 | Display panel |
| CN113891223A (en) * | 2020-07-02 | 2022-01-04 | 知微电子有限公司 | Package structure and method for manufacturing sounding chip, package structure and sounding instrument |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20070013974A (en) | 2007-01-31 |
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Open date: 20070131 |