CN101873520B - Sound-generating device - Google Patents
Sound-generating device Download PDFInfo
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- CN101873520B CN101873520B CN 201010200768 CN201010200768A CN101873520B CN 101873520 B CN101873520 B CN 101873520B CN 201010200768 CN201010200768 CN 201010200768 CN 201010200768 A CN201010200768 A CN 201010200768A CN 101873520 B CN101873520 B CN 101873520B
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Abstract
The invention relates to a headset which comprises a shell and a speaker, wherein the speaker is arranged in the shell; and the shell is made of magnesium-based composite materials, the magnesium-based composite materials comprise magnesium-based metal and nano reinforced phases dispersed in the magnesium-based metal, and the grain size of the magnesium-based composite materials is 100-150 micrometers. The mass percentages of the nano reinforced phases are 0.01% to 25 in the magnesium-based composite materials.
Description
Technical field
The present invention relates to a kind of earphone, relate in particular to a kind of earphone of using the alloy housing.
Background technology
Along with the development of new technology and new material, people are also more and more higher to the requirement of audiovisual quality.Sound-producing device, such as earphone, sound equipment, product emerges in an endless stream, yet, in the prior art improvement of sounding dress tonequality is focused on more the improvement of its boombox, improve less to housing.But housing is equally very large to the response of tonequality, directly affects the effect of loud speaker.
Take earphone as example, its housing many because resonance and reverberation impact the sounding effect of loud speaker and whole earphone, earphone case of the prior art is plastics or resin, cause the reverberation of earphone sounding longer, the resonance of housing is stronger, sounding effect is clear not, makes earphone have the bad problem of tonequality.In addition, the housing durability of plastics or resin is bad, easily distortion, and light and handy not.
Summary of the invention
A kind of earphone, it comprises: housing; And loud speaker, this loud speaker is arranged at this enclosure interior; The material of this housing is magnesium base composite material, this magnesium base composite material comprises magnesium-base metal and the nanometer reinforcing phase that is dispersed in this magnesium-base metal, the crystal grain of this magnesium base composite material is 100 microns to 150 microns, and the quality percentage composition of described nanometer reinforcing phase in magnesium base composite material is 0.01% to 2%.
Compared with prior art, the technical program adopts magnesium base composite material as the housing of earphone, can reduce reverberation and resonance that housing produces, makes sounding effect clear, thereby improves the tonequality of earphone.And the housing of magnesium base composite material is more more sturdy and durable than plastic casing, because this housing has preferably intensity, under the prerequisite that satisfies the intensity needs, can adopt less wall thickness, thereby alleviate the oeverall quality of earphone, and the earphone inner space is increased.
Description of drawings
Fig. 1 is the structural representation of the technical program embodiment earphone.
Fig. 2 is 50 times of optical microscope photographs of AZ91D magnesium alloy.
Fig. 3 has 50 times of optical microscope photographs of magnesium base composite material that mass percent is 0.5% nanometer reinforcing phase.
Fig. 4 has 50 times of optical microscope photographs of magnesium base composite material that mass percent is 1% nanometer reinforcing phase.
Fig. 5 has 50 times of optical microscope photographs of magnesium base composite material that mass percent is 1.5% nanometer reinforcing phase.
Fig. 6 is the high-resolution transmission electron microscope photo of carborundum and magnesium crystal grain boundary in the magnesium base composite material.
Fig. 7 is the test data figure of magnesium base composite material tensile strength with nanometer reinforcing phase of different quality percentage composition.
Fig. 8 is the test data figure of magnesium base composite material percentage elongation with nanometer reinforcing phase of different quality percentage composition.
Fig. 9 is the total harmonic distortion curve test data figure of earphone with earphone case of different materials.
Figure 10 is the waterfall analysis chart with earphone of plastics earphone case.
Figure 11 is the waterfall analysis chart with earphone of AZ91D magnesium alloy earphone case.
Figure 12 is the waterfall analysis chart with earphone of magnesium base composite material earphone case.
Embodiment
Describe the earphone of the technical program embodiment in detail below with reference to accompanying drawing.
The technical program provides a kind of earphone, and this earphone comprises the housing of hollow and the loud speaker that is arranged at enclosure interior.
See also Fig. 1, the technical program execution mode is take earphone 10 as example, the loud speaker 14 that this earphone 10 comprises the earphone case of hollow and is arranged at enclosure interior.This earphone 10 can be the structures such as wear-type, supra-aural, In-Ear or ear type.
This loud speaker 14 can be the types such as electrodynamic type, condenser type, electrostatic, pneumatic type and piezoelectric type.This loud speaker 14 is used for converting the electrical signal to voice signal.Particularly, can to change the audio-frequency electric power signal in the certain limit into distortion by the transducing mode little and have a sub-audible sound of enough sound pressure levels for loud speaker 14.In the present embodiment, this loud speaker 14 is dynamic speaker 14.
The wall thickness of this housing is 0.01 millimeter to 2 millimeters.This housing can comprise that this front portion 12 can further comprise a plurality of phonate holes in the face of the rear portion 16 of user's front portion 12 and connection wire.In the present embodiment, this earphone is ear type, and anterior 12 for having the disk lid of phonate hole, and rear portion 16 is the bowl-type pedestal that fastens with the disk lid.
At least one part is made by magnesium base composite material in the front portion 12 of this housing and the rear portion 16.In the present embodiment, this housing integral body is made by magnesium base composite material, and namely the material of disk lid and bowl-type pedestal is magnesium base composite material.This magnesium base composite material comprises magnesium-base metal and the nanometer reinforcing phase that is dispersed in this magnesium-base metal.This nanometer reinforcing phase can be carbon nano-tube, nanometer silicon carbide particle, aluminum oxide nanoparticle, titanium carbide nano particle, boron carbide nano particle, graphite nanoparticles or its mixing, is preferably carbon nano-tube or nanometer silicon carbide particle.This carbon nano-tube can be in Single Walled Carbon Nanotube, double-walled carbon nano-tube and the multi-walled carbon nano-tubes one or more.The diameter of described Single Walled Carbon Nanotube is 0.5 nanometer～50 nanometers, and the diameter of described double-walled carbon nano-tube is 1.0 nanometers～50 nanometers, and the diameter of described multi-walled carbon nano-tubes is 1.5 nanometers～50 nanometers.The quality percentage composition of this nanometer reinforcing phase in magnesium base composite material is about 0.01% to 10%, is preferably 0.5% to 2%.The shape of this nanometer reinforcing phase can be powder, fiber or whisker.The size of this nanometer reinforcing phase is about 1 nanometer to 100 nanometer, is preferably 30 nanometer to 50 nanometers.This magnesium-base metal is pure magnesium or magnesium alloy.Outside the component demagging of this magnesium alloy, also comprise one or more of the alloying elements such as zinc, manganese, aluminium, zirconium, thorium, lithium, silver, calcium, wherein magnesium accounts for the magnesium alloy mass percent more than 80%, and the sum total of other metallic element accounts for the magnesium alloy mass percent below 20%.The model of this magnesium alloy can for AZ91, AM60, AS41, AS21, AE42, be preferably AZ91.
The adding of this nanometer reinforcing phase is conducive to the refinement of magnesium-base metal crystal grain, can improve tensile strength (tensile strength) and the percentage elongation (elongation) of this housing.In the present embodiment, this magnesium-base metal adopts the magnesium alloy of AZ91D model, and this nanometer reinforcing phase adopts carbon nano-tube or nanometer silicon carbide particle.See also Fig. 2 to Fig. 5, to have mass percent is 0.5%, the magnesium base composite material of 1% and 1.5% nanometer reinforcing phase and pure AZ91D magnesium alloy carry out the crystal grain contrast, discovery is along with the nanometer reinforcing phase mass percent improves in 0.5% to 2% scope gradually, and the crystal grain of this magnesium base composite material obviously reduces.The crystal grain ratio of described this magnesium base composite material reduces 60% to 75% for the manufacture of the crystal grain of the magnesium-base metal of this magnesium base composite material.The crystal grain of this magnesium base composite material is about 100 microns to 150 microns.In the present embodiment, when the nanometer reinforcing phase of this magnesium base composite material is mass percent when being 0.5% to 2% carbon nano-tube, the crystal grain of this magnesium base composite material can reduce 60% to 75% than the crystal grain of AZ91D magnesium alloy.See also Fig. 6, when the nanometer reinforcing phase of this magnesium base composite material is mass percent when being 0.5% to 2% carborundum, the interface between magnesium crystal grain and the carborundum grain is clear, the middle phase of not reacting between Presence of an interface.See also Fig. 7, the magnesium base composite material that with nanometer reinforcing phase is the carbon nano-tube of different quality percentage composition carries out the tensile strength test, find that this magnesium base composite material has preferably tensile strength when carbon nano-tube accounts for the magnesium base composite material mass percent and is 1.5%.
Seeing also Fig. 8, is that the magnesium base composite material of the carbon nano-tube of different quality percentage composition carries out test of elongation rate with nanometer reinforcing phase, finds that this magnesium base composite material has preferably percentage elongation when carbon nano-tube accounts for the magnesium base composite material mass percent and is 1.5%.Above-mentioned test shows, by in magnesium-base metal, adding nanometer reinforcing phase, effectively refinement crystal grain, tensile strength and the percentage elongation of magnesium base composite material have been improved, be conducive to the manufacturing of this earphone case, and being conducive to improve intensity and the durability of this earphone case, concrete test data sees also table 1.
Table 1 tensile strength and test of elongation rate tables of data
Carbon nano-tube quality percentage composition 0% 0.01% 0.5% 1% 1.5% 2%
Tensile strength (MPa) 86 86.5 89 96 104 90
Percentage elongation (%) 0.92 0.93 1.1 1.26 1.28 0.67
The manufacture method of this housing can be thixotropic forming, casting forming, powder metallurgy or machining shaping etc.Particularly, powder, fiber or the whisker of described nanometer reinforcing phase can be added in the magnesium-base metal of melting, and obtain earphone case by the method for thixotropic forming or casting forming, perhaps the powder of magnesium-base metal can be mixed with nanometer reinforcing phase, and prepare earphone case by the method for powder metallurgy, in addition, also described magnesium base composite material can be pre-formed base substrate, and form earphone case by the mode of machining.
In the present embodiment, the preparation method of this magnesium base composite material may further comprise the steps:
At first, provide magnesium-base metal and nanometer reinforcing phase;
Secondly, nanometer reinforcing phase is carried out the mixed-shaped resulting mixture at 460 ℃ to the 580 ℃ lower magnesium-base metals that add melting;
Again, under 620 ℃ to 650 ℃ this mixture being carried out the ultrasonic wave processing is dispersed in the magnesium-base metal nanometer reinforcing phase; And
At last, this mixture is cast under 680 ℃ at 650 ℃, form the magnesium base composite material base substrate.
Temperature in above-mentioned mixing, ultrasonic wave processing and casting cycle divides three phases to raise gradually, be conducive to make the grain refinement in the magnesium base composite material, and said process carries out in protective gas all, and is oxidized to prevent magnesium-base metal.Described protective gas can be selected from one or more in inert gas and the nitrogen, and protective gas is preferably and is nitrogen in the present embodiment.
Particularly, this magnesium-base metal can be the AZ91D magnesium alloy, and this nanometer reinforcing phase can be carbon nano-tube or carborundum.The magnesium-base metal of this melting can be arranged in the container that an inside is full of protective gas.In the process of the magnesium-base metal that nanometer reinforcing phase is added this melting, can further constantly carry out mechanical agitation to the mixture in the container by blender, the magnesium-base metal of nanometer reinforcing phase and this melting is tentatively mixed, obtain a mixed slurry.
The process that this ultrasonic wave is processed can be that mixture is placed a high-energy ultrasonic oscillation agitating device together with container, after concussion a period of time under the ultrasonic wave of certain frequency, obtains an even mixed slurry.Described hyperacoustic frequency is 15 KHz to 20 KHz, and hyperacoustic calibration is 15 KHz in the present embodiment.The time that described ultrasonic wave is processed is 5 minutes to 40 minutes, is preferably 30 minutes.The ultrasonic frequency of ultrasonic concussion that the technical program adopts is chosen as the 15-20 KHz, for general ultrasonic frequency 48 KHz, hyperacoustic frequency that the technical program adopts is lower, and this ultrasonic rocking equipment ultrasonic concussion agitating device that is a high-energy, therefore the amplitude of this ultrasonic rocking equipment is larger, therefore can make the light metal particulate in the molten soup of light metal that strenuous exercise occurs, thereby can make nano-scale particle strengthen body uniform distribution in the molten soup of light metal, obtain an even mixed slurry.
This mixed slurry can be poured into cooling curing in the mould in the process of casting, forms this magnesium base composite material base substrate.Further, can process this magnesium base composite material base substrate by an extrusion modling processing procedure.By this extrusion modling processing procedure, this nanometer reinforcing phase through again sub-distribution, disperses more evenly in this mixture, can further improve intensity and the toughness of this magnesium base composite material.
This base substrate can further pass through die cast, obtains this earphone case.As nanometer reinforcing phase, the AZ91D magnesium alloy is as magnesium-base metal with carbon nano-tube, and the quality percentage composition of this nanometer reinforcing phase is 1.5%, by the standby housing of casting forming legal system.See also table 2, the housing that this magnesium base composite material is made is compared with plastic casing and AZ91D magnesium alloy shell, has preferably yield strength, and density ratio AZ91D magnesium alloy decreases.
Table 2 different materials housing performance comparison
Parameter plastics (PC+ABS) AZ91D magnesium alloy magnesium base composite material
Density (g/cm3) 1.07 1.82 1.80
Yield strength (MPa) 39 230 276
Under the condition that adopts identical shaped housing, earphone to the housing that adopts this magnesium base composite material carries out acoustical testing, and compare discovery with the earphone of AZ91D magnesium alloy shell and the earphone of plastic casing, adopt the housing earphone of making and the earphone that adopts the AZ91D magnesium alloy shell of this magnesium base composite material and adopt the earphone of plastic casing to have basically identical frequency response curve and impedance curve.Yet, seeing also Fig. 9, the earphone that adopts the housing of this magnesium base composite material to make has minimum total harmonic distortion in the earphone of three kinds of tests.20 hertz to 50 hertz frequency scopes, adopt the total harmonic distortion of earphone of the housing of magnesium base composite material to reduce approximately 10% than the earphone of AZ91D magnesium alloy shell.
See also Figure 10 to 12, from the waterfall analysis chart of the housing that adopts different materials, can find out, 20 hertz to 30 hertz scopes, adopt the earpiece audio amplitude of magnesium base composite material housing minimum, thereby make the total harmonic distortion of this earphone minimum, and 100 hertz to 600 hertz scopes, adopting the earphone of magnesium base composite material housing than other two kinds of earphone waveform homogeneous, this earphone has clearly characteristics of sounding effect as can be known.
The technical program adopts magnesium base composite material as the housing of earphone, and reverberation that can the shortening earphone sounding reduces earphone case resonance, makes sounding effect clear, thereby improves the tonequality of earphone.And the housing of magnesium base composite material is more more sturdy and durable than plastic casing, because this housing has preferably intensity, under the prerequisite that satisfies the intensity needs, can adopt less wall thickness, thereby alleviate the oeverall quality of earphone, and the earphone inner space is increased.In addition, magnesium base composite material has good thermal conductivity, is beneficial to the earphone heat radiation.
It will be appreciated by those skilled in the art that, although the technical program describes as specific embodiment with earphone, yet because described housing has above-mentioned advantage because of the material itself of making housing, therefore it is better that other sound-producing device that has a described housing also can have sounding effect, lighter weight, the sturdy and durable and advantage that is easy to dispel the heat.
In addition, those skilled in the art also can do other variations in spirit of the present invention, and certainly, the variation that these are done according to spirit of the present invention all should be included within the present invention's scope required for protection.
Claims (10)
1. earphone, it comprises:
Housing; And
Loud speaker, this loud speaker is arranged at this enclosure interior;
It is characterized in that: the material of this housing is magnesium base composite material, this magnesium base composite material comprises magnesium-base metal and the nanometer reinforcing phase that is dispersed in this magnesium-base metal, the crystallite dimension of this magnesium base composite material is 100 microns to 150 microns, and the quality percentage composition of described nanometer reinforcing phase in magnesium base composite material is 0.01% to 2%.
2. earphone as claimed in claim 1 is characterized in that, the crystallite dimension of described magnesium base composite material reduces 60% to 75% than the crystallite dimension of described magnesium-base metal.
3. earphone as claimed in claim 1 is characterized in that, the quality percentage composition of described nanometer reinforcing phase in magnesium base composite material is 0.5% to 2%.
4. earphone as claimed in claim 1 is characterized in that, the quality percentage composition of described nanometer reinforcing phase in magnesium base composite material is 1.5%.
5. earphone as claimed in claim 1 is characterized in that, described nanometer reinforcing phase is of a size of 30 nanometer to 50 nanometers.
6. earphone as claimed in claim 1 is characterized in that, described nanometer reinforcing phase is one or more the mixing in carbon nano-tube, nanometer silicon carbide particle, aluminum oxide nanoparticle, titanium carbide nano particle, boron carbide nano particle, the graphite nanoparticles.
7. earphone as claimed in claim 1 is characterized in that, described magnesium-base metal is magnesium or magnesium alloy.
8. earphone as claimed in claim 7 is characterized in that, the model of described magnesium alloy is AZ91, AM60, AS41, AS21 or AE42.
9. earphone as claimed in claim 1 or 2 is characterized in that, described magnesium-base metal is that model is the magnesium alloy of AZ91D, and described nanometer reinforcing phase is carbon nano-tube, and the quality percentage composition of described carbon nano-tube in magnesium base composite material is 1.5%.
10. earphone as claimed in claim 1 is characterized in that, the wall thickness of described housing is 0.01 millimeter to 2 millimeters.
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| CN 201010200768 CN101873520B (en) | 2010-06-14 | 2010-06-14 | Sound-generating device |
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| CN 201010200768 CN101873520B (en) | 2010-06-14 | 2010-06-14 | Sound-generating device |
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| CN101873520B true CN101873520B (en) | 2013-03-06 |
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| CN1832501A (en) * | 2005-03-11 | 2006-09-13 | 鸿富锦精密工业（深圳）有限公司 | Multifunction electronic device |
| CN1910951A (en) * | 2004-04-13 | 2007-02-07 | 松下电器产业株式会社 | Speaker device |
| CN1939086A (en) * | 2004-03-31 | 2007-03-28 | 松下电器产业株式会社 | Speaker device |
| WO2007136162A1 (en) * | 2006-05-19 | 2007-11-29 | Ibule Photonics Co., Ltd. | Piezoelectric vibrator for regenerating sound, and piezoelectric panel speaker and piezoelectric earphone having the same |
| CN101200796A (en) * | 2006-12-13 | 2008-06-18 | 比亚迪股份有限公司 | Method for preparing electronic product shell |
| CN201197707Y (en) * | 2008-02-03 | 2009-02-25 | 幻音科技(深圳)有限公司 | Sensing device for continuously monitoring vital sign parameters when doing sports |
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- 2010-06-14 CN CN 201010200768 patent/CN101873520B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1939086A (en) * | 2004-03-31 | 2007-03-28 | 松下电器产业株式会社 | Speaker device |
| CN1910951A (en) * | 2004-04-13 | 2007-02-07 | 松下电器产业株式会社 | Speaker device |
| CN1832501A (en) * | 2005-03-11 | 2006-09-13 | 鸿富锦精密工业（深圳）有限公司 | Multifunction electronic device |
| WO2007136162A1 (en) * | 2006-05-19 | 2007-11-29 | Ibule Photonics Co., Ltd. | Piezoelectric vibrator for regenerating sound, and piezoelectric panel speaker and piezoelectric earphone having the same |
| CN101200796A (en) * | 2006-12-13 | 2008-06-18 | 比亚迪股份有限公司 | Method for preparing electronic product shell |
| CN201197707Y (en) * | 2008-02-03 | 2009-02-25 | 幻音科技(深圳)有限公司 | Sensing device for continuously monitoring vital sign parameters when doing sports |
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