CN108322864A - A kind of sound cavity apparatus and mobile terminal - Google Patents
A kind of sound cavity apparatus and mobile terminal Download PDFInfo
- Publication number
- CN108322864A CN108322864A CN201710028284.9A CN201710028284A CN108322864A CN 108322864 A CN108322864 A CN 108322864A CN 201710028284 A CN201710028284 A CN 201710028284A CN 108322864 A CN108322864 A CN 108322864A
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- China
- Prior art keywords
- sound
- cavity
- nanometer
- cavity apparatus
- absorbing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2400/00—Loudspeakers
- H04R2400/11—Aspects regarding the frame of loudspeaker transducers
Abstract
The invention discloses a kind of sound cavity apparatus and mobile terminals.The sound cavity apparatus includes：Cavity, the cavity have sound outlet hole；Loud speaker, the loud speaker are located in the cavity；Wherein, it is provided with sound-absorbing structure on the inner wall of the cavity.The sound cavity apparatus disclosure satisfy that the acoustic performance requirements of small size cavity design, also can be the case where reducing size for traditional speaker using the sound cavity apparatus, while improve its acoustical behavior and portability.
Description
Technical field
The present invention relates to sound chamber technical fields, specifically, being related to a kind of sound cavity apparatus and mobile terminal.
Background technology
Substantially the sound cavity apparatus for playing sound, the sound of existing mobile phone are both provided in existing mobile terminal such as mobile phone
Chamber device generally uses common material and the cavity or integral speakers of inner wall smooth and box body (BOX) structure of cavity, due to
Influence of the musical sound of low frequency part to sound quality is very big, and low-frequency resonant point is lower, and subjective audio is more melodious, and uses upper
The bass effect for stating the mobile phone of structure is difficult to be improved from the later stage.Specifically, being influenced by handset size, sound chamber is kept for fill
The space set is smaller and smaller, and cavity is smaller, and low-frequency resonant point is higher, and the sense of hearing of mobile phone can also be deteriorated, and frequency band narrows, sound pressure level
It can be limited, to VOLUME UP, it is also necessary to additional power amplifier supports that it is difficult improvement sound effect not only to have increased cost again,
Therefore, increasingly higher demands are proposed for the design of the sound cavity apparatus of mobile terminal.
For traditional speaker, the sound cavity apparatus of volume ratio mobile phone is big, and the cavity of speaker can accommodate phase-reversing tube
Or the devices such as resonance basin promote the low-frequency effect of cavity, but since volume is big, portability is poor.With the size of traditional speaker
It is continued to develop towards miniaturization in order to carry and move, the size of cavity is constantly reducing, but to its acoustical behavior
It is required that it is higher and higher, therefore, how to keep or enhance acoustical behavior to be speaker design the case where reducing box sizes
One problem of urgent need to resolve.
Invention content
For problems of the prior art, one aspect of the present invention provides a kind of sound cavity apparatus, including：
Cavity, the cavity have sound outlet hole；
Loud speaker, the loud speaker are located in the cavity；
Wherein, it is provided with sound-absorbing structure on the inner wall of the cavity.
Preferably, the sound-absorbing structure is the nanometer sound-absorbing thin layer for the inner wall for covering the cavity.
Preferably, the material of the nanometer sound-absorbing thin layer is selected from nanometer sound-absorbing coating, nanometer acoustical cotton or nanometer sound-absorbing tree
Fat.
Preferably, the thickness of the nanometer sound-absorbing thin layer is 5 × 10-6Mm~3 × 10-5mm。
Preferably, the sound-absorbing structure is provided in multiple sound-absorption holes on the inner wall of the cavity.
Preferably, the sound-absorption hole is exponential type curve or hyperbolic along the cross sectional shape of the inner wall perpendicular to the cavity
Line, the sound-absorption hole are circle along the cross sectional shape for the inner wall for being parallel to the cavity.
Preferably, the opening diameter of the sound-absorption hole is 0.2mm~0.4mm, and the depth capacity of the sound-absorption hole is 0.1mm
~0.35mm.
Preferably, the structure of the multiple sound-absorption hole is identical.
Preferably, the cavity is also with preceding sound chamber, rear sound chamber and the holding part for housing the loud speaker, the holding part
Between the preceding sound chamber and the rear sound chamber, the sound outlet hole is connected to the preceding sound chamber and the external world.
Preferably, the sound cavity apparatus further includes phase-reversing tube or the passive low frequency radiator being arranged in the cavity.
Another aspect of the present invention provides a kind of mobile terminal, and the mobile terminal includes above-mentioned sound cavity apparatus.
Compared with prior art, sound cavity apparatus of the invention and mobile terminal at least have the advantages that：The sound chamber
Device disclosure satisfy that the acoustic performance requirements of small size cavity design, for traditional speaker using the sound cavity apparatus,
Can be the case where reducing size, while improving its acoustical behavior and portability.
Description of the drawings
Its example embodiment is described in detail by referring to accompanying drawing, above and other feature of the invention and advantage will become
It is more obvious.
Fig. 1 is the schematic cross-section of the sound cavity apparatus of one embodiment of the invention.
Fig. 2A is the schematic cross-section of the sound cavity apparatus of another embodiment of the present invention.
Fig. 2 B are the local overlooking schematic diagrames of the cavity of the sound cavity apparatus of Fig. 2A.
Fig. 3 is the schematic cross-section of the sound cavity apparatus of further embodiment of this invention.
Fig. 4 is the schematic cross-section of the sound cavity apparatus of further embodiment of this invention.
Specific implementation mode
Example embodiment is described more fully with reference to the drawings.However, example embodiment can be with a variety of shapes
Formula is implemented, and is not understood as limited to embodiment set forth herein；On the contrary, thesing embodiments are provided so that the present invention more
Fully and completely, and by the design of example embodiment comprehensively it is communicated to those skilled in the art.It is identical attached in figure
Icon note indicates same or similar structure, thus will omit repetition thereof.
The word of expression position and direction described in the present invention, is the explanation carried out by taking attached drawing as an example, but according to need
It wants to make a change, done change is all contained in the scope of the present invention.It is opposite that the attached drawing of the present invention is only used for signal
Position relationship, the thickness at certain positions use the plotting mode lavished praise on oneself in order to understand, the thickness in attached drawing does not represent reality
The proportionate relationship of border thickness.
Fig. 1 is the schematic cross-section of the sound cavity apparatus of one embodiment of the invention, referring to Fig.1, sound cavity apparatus of the invention
Loud speaker 12 including cavity 11 and in cavity 11.
Cavity 11 has sound outlet hole 111, and is provided with sound-absorbing structure on the inner wall of cavity 11, by the way that sound-absorbing structure energy is arranged
Enough improve the low-frequency effect of cavity 11.Specifically, by taking the sound cavity apparatus of the present embodiment as an example, the cavity 11 of the sound cavity apparatus is also
Holding part 115 with preceding sound chamber 113, rear sound chamber 114 and accommodating loud speaker 12, holding part 115 are located at preceding sound chamber 113 and rear sound
Between chamber 114, sound chamber 113 and the external world, the low-frequency resonant frequency of the cavity 11 of the rigidity are before sound outlet hole 111 is connected to：
Wherein, CAFor the acoustic compliance of cavity 11；
MAFor the equivalent mass of the voice coil and sound film of loud speaker 12.
In the sound cavity apparatus course of work, rear 114 air vibration of sound chamber generates an elastic potential energy, the bullet of the elastic potential energy
Property coefficient KMFor：
Wherein, SDFor the equivalent area of the sound film of loud speaker 12.
In the present invention, by the way that sound-absorbing structure is arranged on the inner wall of cavity 11, the energy of air in cavity 11 can be inhaled
It receives and is converted to thermal energy and distribute, to reduce the elastic potential energy of air vibration generation, that is to say, that in shaking for air vibration
In the case of constant, coefficient of elasticity KMReduce, in formula 2, due to SDIt is constant, therefore the acoustic compliance C of cavity 11ABecome larger.In formula 1, MA
It is constant, in CAIn the case of becoming larger, the low-frequency resonant frequency f of the cavity 11 of sound cavity apparatussReduce, i.e. the low-frequency effect of cavity 11
Be improved significantly, meanwhile, do not change the vibrational state of loud speaker 12.
Using the above-mentioned sound cavity apparatus that sound-absorbing structure is arranged on the inner wall of cavity 11, it disclosure satisfy that small size cavity 11 is set
The acoustic performance requirements of meter also can be the case where reducing size, simultaneously for traditional speaker using the sound cavity apparatus
Improve its acoustical behavior and portability.
It should be noted that the cross sectional shape of the cavity 11 in the present embodiment is rectangle, in other embodiments, cavity 11
Cross sectional shape can also be square or other regular shapes or irregular shape.
In a preferred embodiment, sound-absorbing structure is the nanometer sound-absorbing thin layer 112 for the inner wall for covering cavity 11, which inhales
Sound thin layer 112 can only cover the internal partial wall of cavity 11, can also cover all inner walls of cavity 11, since nanometer sound-absorbing is thin
Layer 112 has big specific surface area, and in the sound cavity apparatus course of work, nanometer sound-absorbing thin layer 112 can quickly and evenly absorb
Elastic potential energy that air vibration generates simultaneously is converted to thermal energy and distributes, and then improves the low-frequency effect of cavity 11.
Optionally, the material of nanometer sound-absorbing thin layer 112 includes but not limited to be a nanometer sound-absorbing coating, nanometer acoustical cotton or receive
Rice sound-absorbing resin.The material of nanometer sound-absorbing coating for example can be a nanometer acoutic fibre board, nanometer silica aerogel, nanometer sound-absorbing ceramics
With nano composite material etc..Wherein, the average grain diameter of the material of nanometer sound-absorbing coating is 5nm~100nm, is applied with common sound-absorbing
Layer is compared, and nanometer sound-absorbing coating made of the material using the size, which has, to be ensured good sound-absorbing effect while will not reduce chamber
The effect of body volume itself, nanometer sound-absorbing coating can be arranged on the inner wall of cavity 11 by coating process.Nanometer acoustical cotton be
Refer to the materials such as nanofiber or nanosponges, compared with common acoustical cotton, nanometer acoustical cotton has the effect small, stability is good
Fruit, nanometer acoustical cotton can be arranged by heat pressing process or adhesive attraction on the inner wall of cavity 11.Nanometer sound-absorbing resin refers to gathering
The materials such as vinyl, compared with common sound-absorbing resin, nanometer sound-absorbing resin has good sound absorption, not easily to fall off and good
The effect of good thermal diffusivity, nanometer sound-absorbing resin can be arranged on the inner wall of cavity 11 by coating process.
For the sound cavity apparatus for the small size cavity 11 that such as the present embodiment uses, more preferably applied using nanometer sound-absorbing
Layer or nanometer sound-absorbing resin, compared with nanometer acoustical cotton, nanometer sound-absorbing coating or nanometer sound-absorbing resin are easier to encapsulate to be arranged and exist
On the inner wall of the cavity 11 of small size, therefore, packaging cost is lower.
In a preferred embodiment, the thickness of nanometer sound-absorbing thin layer 112 is 5 × 10-6Mm~3 × 10-5Mm, inventor
It was found that the nanometer sound-absorbing thin layer 112 of the thickness is small on the influence of the volume of the cavity 11 of sound cavity apparatus, while there is larger ratio table
Area and sound absorbing power can significantly improve the low-frequency effect of cavity 11.
In the present embodiment, the also holding part 115 with preceding sound chamber 113, rear sound chamber 114 and accommodating loud speaker 12 of cavity 11,
Holding part 115 is between preceding sound chamber 113 and rear sound chamber 114, sound chamber 113 and the external world before sound outlet hole 111 is connected to, using above-mentioned chamber
The sound cavity apparatus of body 11 can be applied in mobile terminal, such as in the mobile phone smaller applied to installation space.Optionally, it houses
Portion 115 has opposite step surface, and loud speaker 12 is arranged on the step surface of holding part 115, and is fixed on by adhesive 116
The step surface of holding part 115.In the present embodiment, the step surface of holding part 115 is inner shoulder table, i.e. step surface is located at by holding part
115 in the accommodating space formed, and in other embodiments, loud speaker 12 can also be pacified by buckle or other connection types
On holding part 115.
The structure and type of the present invention not limiting loudspeaker 12, may be used known technology, as an example, loud speaker 12
May include vibrational system and magnetic circuit system, vibrational system includes vibrating diaphragm and voice coil, and magnetic gap, voice coil setting is arranged in magnetic circuit system
In the magnetic gap of magnetic circuit system.
Fig. 2A is the schematic cross-section of the sound cavity apparatus of another embodiment of the present invention, sound cavity apparatus and Fig. 1 shown in Fig. 2A
Shown in sound cavity apparatus structure it is similar, including cavity 21 and loud speaker 22, cavity 21 have sound outlet hole 211, difference lies in,
In the sound cavity apparatus of Fig. 2A, sound-absorbing structure is provided in multiple sound-absorption holes 212 on the inner wall of cavity 21, with nanometer sound-absorbing thin layer
112 effect is similar, and sound-absorption hole 212 can increase the internal surface area of cavity 21, in the sound cavity apparatus course of work, sound-absorption hole
212 can quickly and evenly absorb the elastic potential energy of air vibration generation and be converted to thermal energy and distribute, so as to improve cavity
21 low-frequency effect.
With reference to Fig. 2 B, in a preferred embodiment, sound-absorption hole 212 is to refer to along the cross sectional shape of the inner wall perpendicular to cavity 21
Number type curve or hyperbola, sound-absorption hole 212 is circle along the cross sectional shape for the inner wall for being parallel to cavity 21, using the suction of the structure
Sound hole 212 can reduce the generation of back wave or standing wave, and sound wave is entered by curve entrance in sound-absorption hole, because of both structures
Mathematical characteristic, incidence wave can all pass through multiple reflections, so that the gradual attenuation of energy is fallen, and flee from shared by the acoustic wave energy of sound-absorption hole
Ratio regular meeting be less than incidence wave 1/3, this effect for keeping cavity final can have greatly improved than originally.
In one embodiment, the opening diameter of sound-absorption hole 212 is 0.2mm~0.4mm, the depth capacity of sound-absorption hole 212
For 0.1mm~0.35mm, this design method needs that percent opening is made to reach 60% or more.The size design needs of sound-absorption hole are taken into account
Factor of both sound-absorbing effect and cavity intensity, present design have outstanding sound-absorbing effect while ensureing that cavity is stablized
Fruit can be drawn from traditional housing surface and obtain certain acoustics low frequency improvement in adhesive process.
Preferably, the structure of multiple sound-absorption holes 212 is identical so that more through treated the audio of sound-absorption hole 212
Uniformly, acoustical behavior is more preferably.
Fig. 3 is the schematic cross-section of the sound cavity apparatus of further embodiment of this invention, similar with sound cavity apparatus shown in FIG. 1,
Including cavity 31 and loud speaker 32, cavity 31 has a sound outlet hole 311, same on the inner wall of cavity 31 in sound cavity apparatus shown in Fig. 3
Sample is provided with the sound-absorbing thin layer 312 of the low-frequency effect for improving cavity 31, and difference lies in Fig. 3 with sound cavity apparatus shown in FIG. 1
Shown in be additionally provided with the phase-reversing tube 313 in cavity 31 in sound cavity apparatus, to form a kind of paraphase tubular type loudspeaker arrangement,
So that the sound cavity apparatus of the present invention can be applied to traditional speaker, under the dimensional conditions for reducing traditional speaker, can enhance
The acoustical behavior of speaker.In the present embodiment, sound outlet hole 311 and phase-reversing tube 313 are arranged on the same side wall of cavity 31, at other
In embodiment, sound outlet hole 311 and phase-reversing tube 313 can also be arranged as required on the different lateral of cavity 31.
It should be noted that the sound-absorbing thin layer 312 in sound cavity apparatus shown in Fig. 3 can also be used such as institute in Fig. 2A and Fig. 2 B
The sound-absorption hole 212 shown replaces, and it will not be described here for concrete structure.
Fig. 4 is the schematic cross-section of the sound cavity apparatus of further embodiment of this invention, similar with sound cavity apparatus shown in FIG. 1,
Including cavity 41 and loud speaker 42, cavity 41 has a sound outlet hole 411, same on the inner wall of cavity 41 in sound cavity apparatus shown in Fig. 4
Sample is provided with the sound-absorbing thin layer 412 of the low-frequency effect for improving cavity 41, and difference lies in Fig. 4 with sound cavity apparatus shown in FIG. 1
Shown in be additionally provided with the passive low frequency radiator 413 in cavity 41 in sound cavity apparatus, to form a kind of empty cone formula
Loudspeaker arrangement so that sound cavity apparatus of the invention can be applied to traditional speaker, under the dimensional conditions for reducing traditional speaker,
The acoustical behavior of speaker can be enhanced.In the present embodiment, sound outlet hole 411 and passive low frequency radiator 413 are arranged in cavity 41
On same side wall, in other embodiments, sound outlet hole 411 and passive low frequency radiator 413 can also be arranged as required in chamber
On the different lateral of body 41.
It should be noted that the sound-absorbing thin layer 412 in sound cavity apparatus shown in Fig. 4 can also be used such as institute in Fig. 2A and Fig. 2 B
The sound-absorption hole 212 shown replaces, and it will not be described here for concrete structure.
Optionally, sound cavity apparatus of the invention may be arranged as playing the other structures needed for sound, including but unlimited
In for controlling control circuit board and the conducting wire (not shown) etc. that sound cavity apparatus works.
On the other hand, the present invention also provides a kind of mobile terminal, which includes above-mentioned sound cavity apparatus, the present invention
The setting of sound cavity apparatus on mobile terminals is not limited, can be configured as needed.The class of the present invention not limiting mobile terminal
Type, the mobile terminal include but not limited to be mobile phone, tablet computer, laptop.
To sum up, sound cavity apparatus of the invention disclosure satisfy that the acoustic performance requirements of small size cavity design, should for using
, also can be the case where reducing size for traditional speaker of sound cavity apparatus, while improving its acoustical behavior and portability.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art are not departing from the principle of the present invention and objective
In the case of can make changes, modifications, alterations, and variations to the above described embodiments within the scope of the invention.
Claims (11)
1. a kind of sound cavity apparatus, which is characterized in that including：
Cavity, the cavity have sound outlet hole；
Loud speaker, the loud speaker are located in the cavity；
Wherein, it is provided with sound-absorbing structure on the inner wall of the cavity.
2. sound cavity apparatus according to claim 1, which is characterized in that the sound-absorbing structure is the inner wall for covering the cavity
Nanometer sound-absorbing thin layer.
3. sound cavity apparatus according to claim 2, which is characterized in that the material of the nanometer sound-absorbing thin layer is inhaled selected from nanometer
Sound coating, nanometer acoustical cotton or nanometer sound-absorbing resin.
4. sound cavity apparatus according to claim 2, which is characterized in that the thickness of the nanometer sound-absorbing thin layer is 5 × 10-6mm
~3 × 10-5mm。
5. sound cavity apparatus according to claim 1, which is characterized in that the sound-absorbing structure is provided in the interior of the cavity
Multiple sound-absorption holes on wall.
6. sound cavity apparatus according to claim 5, which is characterized in that the sound-absorption hole is along the inner wall perpendicular to the cavity
Cross sectional shape be exponential type curve or hyperbola, the sound-absorption hole is circle along the cross sectional shape for the inner wall for being parallel to the cavity
Shape.
7. sound cavity apparatus according to claim 6, which is characterized in that the opening diameter of the sound-absorption hole be 0.2mm~
The depth capacity of 0.4mm, the sound-absorption hole are 0.1mm~0.35mm.
8. sound cavity apparatus according to claim 5, which is characterized in that the structure of the multiple sound-absorption hole is identical.
9. sound cavity apparatus according to claim 1, which is characterized in that the cavity also has preceding sound chamber, rear sound chamber and appearance
The holding part of the loud speaker is set, the holding part is located between the preceding sound chamber and the rear sound chamber, the sound outlet hole connection
The preceding sound chamber and the external world.
10. sound cavity apparatus according to claim 1, which is characterized in that the sound cavity apparatus further includes being arranged in the chamber
Internal phase-reversing tube or passive low frequency radiator.
11. a kind of mobile terminal, which is characterized in that the mobile terminal includes sound cavity apparatus described in claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710028284.9A CN108322864A (en) | 2017-01-16 | 2017-01-16 | A kind of sound cavity apparatus and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710028284.9A CN108322864A (en) | 2017-01-16 | 2017-01-16 | A kind of sound cavity apparatus and mobile terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108322864A true CN108322864A (en) | 2018-07-24 |
Family
ID=62891626
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710028284.9A Pending CN108322864A (en) | 2017-01-16 | 2017-01-16 | A kind of sound cavity apparatus and mobile terminal |
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|---|---|
| CN (1) | CN108322864A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115175056A (en) * | 2022-06-30 | 2022-10-11 | 歌尔股份有限公司 | Shell of sound generating device, sound generating device with shell and electronic equipment |
-
2017
- 2017-01-16 CN CN201710028284.9A patent/CN108322864A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115175056A (en) * | 2022-06-30 | 2022-10-11 | 歌尔股份有限公司 | Shell of sound generating device, sound generating device with shell and electronic equipment |
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