CN110708642A - Acoustic device and electronic apparatus - Google Patents

Acoustic device and electronic apparatus Download PDF

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Publication number
CN110708642A
CN110708642A CN201910928076.3A CN201910928076A CN110708642A CN 110708642 A CN110708642 A CN 110708642A CN 201910928076 A CN201910928076 A CN 201910928076A CN 110708642 A CN110708642 A CN 110708642A
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CN
China
Prior art keywords
sound
acoustic device
closed cavity
flexible deformation
shell
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Granted
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CN201910928076.3A
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Chinese (zh)
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CN110708642B (en
Inventor
郑泽东
徐同雁
张洪鹏
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Goertek Techology Co Ltd
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Goertek Techology Co Ltd
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Priority to CN201910928076.3A priority Critical patent/CN110708642B/en
Priority to PCT/CN2019/126125 priority patent/WO2021056862A1/en
Publication of CN110708642A publication Critical patent/CN110708642A/en
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Publication of CN110708642B publication Critical patent/CN110708642B/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06Loudspeakers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02Details
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2400/00Loudspeakers
    • H04R2400/11Aspects regarding the frame of loudspeaker transducers

Abstract

The invention discloses an acoustic device, which comprises a sound production unit and a first shell, wherein the sound production unit comprises a vibrating diaphragm, the first shell and the vibrating diaphragm are enclosed to form a first closed cavity, a mounting hole is formed in the first shell, a flexible deformation part for covering the mounting hole is arranged at the mounting hole, a second closed cavity is arranged on the outer side of the first closed cavity, the flexible deformation part is positioned between the first closed cavity and the second closed cavity, a first breathable isolating piece for covering the mounting hole is arranged at the mounting hole, the first breathable isolating piece is positioned in the first closed cavity, a second breathable isolating piece is further arranged in the first closed cavity, and a sound absorption material is filled in the first closed cavity. The invention also discloses electronic equipment which comprises a shell and the acoustic device. The acoustic device of the present invention is excellent in acoustic performance.

Description

Acoustic device and electronic apparatus
Technical Field
The present invention relates to the field of acoustic technologies, and in particular, to an acoustic device and an electronic apparatus having the acoustic device.
Background
In general, an acoustic system of a conventional structure includes a closed casing and a sound generating unit provided on the closed casing, a chamber is formed between the closed casing and the sound generating unit, and it is difficult for the acoustic system, particularly a small acoustic system, to achieve an effect of satisfactorily reproducing bass sound due to a volume limit of the chamber in the acoustic system. Conventionally, in order to achieve satisfactory bass reproduction in an acoustic system, two approaches are generally adopted, one is to arrange a sound absorbing material (such as activated carbon, zeolite, etc.) in a box of the acoustic system for adsorbing or desorbing gas in the box, so as to achieve an effect of increasing a volume and further reducing a low-frequency resonance frequency, and the other is to arrange a passive radiator on the box of the acoustic system, wherein a sound emitting unit and the passive radiator simultaneously radiate sound to the outside, and the sound waves of the sound emitting unit and the passive radiator are communicated and superposed by utilizing a principle that the passive radiator and the box form strong resonance at a specific frequency point fp (resonance frequency point), so as to enhance local sensitivity near the resonance frequency point fp (for example, see patent CN 1939086A).
However, the two measures have problems, and the first method has poor improvement effect on the sensitivity of the low-frequency band by filling the sound-absorbing material only when the size and the volume of the cavity are limited; the second scheme adopts a passive radiator, the passive radiator strongly radiates near a resonance frequency point fp, and a sound generating unit is almost stopped, so that the local sensitivity of the acoustic system can be enhanced at a frequency band near fp through the high-sensitivity design of the passive radiator; however, in the frequency band below fp, the sound waves of the passive radiator and the sound generating unit are opposite in phase, the sound waves are mutually counteracted, and the passive radiator plays a negative role in the sensitivity of an acoustic system. In summary, the passive radiator can only improve the sensitivity of the frequency band near the resonance point, but cannot improve the sensitivity of all the low frequency bands, so it is necessary to further improve the defects of the prior art.
Disclosure of Invention
An object of the present invention is to provide a new cavity structure, and an acoustic device which can increase the equivalent volume of the back cavity, reduce the resonant frequency, and significantly improve the low frequency sensitivity as a whole by combining with the placement of the sound absorbing material in the sealed cavity.
To achieve the above and other objects, the present invention provides an acoustic device including:
the sound production unit comprises a vibrating diaphragm, a sound outlet is formed in the acoustic device, and sound waves on the front side of the vibrating diaphragm radiate outwards through the sound outlet;
the vibration diaphragm is enclosed to form a first closed cavity, a mounting hole is formed in the first shell, a flexible deformation part covering the mounting hole is arranged at the mounting hole, a second closed cavity is arranged on the outer side of the first closed cavity, the flexible deformation part is located between the first closed cavity and the second closed cavity, and sound waves generated by the flexible deformation part during deformation are sealed in the second closed cavity by the second closed cavity;
mounting hole department is equipped with the cover the first ventilative separator of mounting hole, first ventilative separator is located first airtight intracavity, first ventilative separator with distance between the flexible deformation portion is configured into flexible deformation portion can not with first ventilative separator bumps mutually when deformation, be equipped with the ventilative separator of second in the first airtight chamber, it has sound absorbing material to fill in the first airtight chamber, first ventilative separator is used for keeping apart sound absorbing material with flexible deformation portion, the ventilative separator of second is used for avoiding sound absorbing material gets into the sound producing unit.
Optionally, the sound absorbing material is made of one or more of activated carbon, zeolite, silica (SiO2), alumina (Al2O3), zirconia (ZrO2), magnesia (MgO), ferroferric oxide (Fe3O4), molecular sieves, fullerene and carbon nanotubes, and sound absorbing cotton.
Optionally, all or part of the flexible deformation part is at least one of TPU, TPEE, LCP, PAR, PC, PA, PPA, PEEK, PEI, PEN, PES, PET, PI, PPS, PPSU, PSU, rubber or silicone.
Optionally, the sound absorbing material is formed into a plurality of sound absorbing particles by a binder.
Optionally, the edge of the first breathable partition is integrated with the first shell in a gluing manner; alternatively, the first and second electrodes may be,
the edge of the first breathable isolating piece and the first shell are combined into a whole in an injection molding mode; alternatively, the first and second electrodes may be,
the edge of the first breathable isolating piece and the first shell are combined into a whole in a hot melting mode.
Optionally, the first and/or second breathable spacers are a mesh, a metal mesh or a breathable film.
Optionally, the sound generating unit comprises a pressure relief hole, and the second breathable isolating piece is covered on the pressure relief hole.
Optionally, the pressure relief hole is located on a side wall of the sound emitting unit.
Optionally, the second breathable separator is bonded to the side wall by injection molding.
Optionally, the second breathable separator is secured to the first housing.
In order to achieve the above and other objects, the present invention provides an electronic apparatus including an enclosure and the above acoustic device, at least a portion of the enclosure forming the first enclosed cavity and/or the second enclosed cavity.
Optionally, a portion of the outer shell and the first shell enclose the second closed cavity.
The acoustic device has the technical effects that at least, in the acoustic device, the first shell and the vibrating diaphragm are enclosed to form the first closed cavity, the first shell is provided with the mounting hole, the mounting hole is provided with the flexible deformation part, and the flexible deformation part deforms along with sound by arranging the flexible deformation part, so that the volume of the first closed cavity is adjustable, the equivalent acoustic compliance of the first closed cavity is increased, the resonance frequency of the acoustic device is effectively reduced, and the low-frequency sensitivity is improved.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is an exploded view of a first embodiment of an acoustic device of the present invention with the second housing removed;
FIG. 2 is a cross-sectional view of a first embodiment of an acoustic device of the present invention;
fig. 3 is a structural view of a sound generating unit in the first embodiment of the acoustic device of the present invention;
FIG. 4 is a cross-sectional view of a second embodiment of an acoustic device of the present invention;
fig. 5 is a cross-sectional view of a third embodiment of the acoustic device of the present invention with the second housing removed;
fig. 6 is a cross-sectional view of a fourth embodiment of the acoustic device of the present invention with the second housing removed;
fig. 7 is a cross-sectional view of a fifth embodiment of the acoustic device of the present invention with the second housing removed.
The reference numbers illustrate:
10 is the sound generating unit, 101 is the pressure release hole, 11 is first casing, 111 is the epitheca, 112 is the inferior valve, 12 is the second casing, 13 is flexible deformation portion, 14 is protector, 141 is the bleeder vent, 142 is the fixed part, 143 is the lateral part, 144 is the bottom, 15 is first ventilative separator, 16 is first airtight chamber, 17 is second airtight chamber, 18 is the pressure-equalizing hole, 19 is the mounting groove, 20 is the sound outlet, 21 is the hot melt muscle, 22 is the mounting hole, 23 is the second ventilative separator.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
The invention provides an acoustic device which is used for sounding on electronic equipment.
As shown in fig. 1, the acoustic device includes a sound emitting unit 10, wherein the sound emitting unit 10 is a miniature sound emitting unit 10, and more specifically, the sound emitting unit 10 is a miniature moving coil speaker. The sound generating unit 10 generally includes a housing, and a vibration system and a magnetic circuit system accommodated and fixed in the housing, the vibration system includes a diaphragm fixed on the housing and a voice coil combined on the diaphragm, the magnetic circuit system is formed with a magnetic gap, the voice coil is disposed in the magnetic gap, and the voice coil reciprocates up and down in a magnetic field after being supplied with alternating current, so as to drive the diaphragm to generate sound.
The acoustic device is provided with a sound outlet 20, sound waves on the front side of the vibrating diaphragm radiate outwards through the sound outlet 20, and sound waves on the rear side of the vibrating diaphragm are reserved inside the acoustic device. A cavity is formed between the vibration diaphragm, the casing of the sound generating unit 10 and the magnetic circuit system, a pressure relief hole 101 is generally formed in the casing of the sound generating unit 10 or in the magnetic circuit system or between the casing and the magnetic circuit system, and sound waves at the rear side of the vibration diaphragm can enter the interior of the acoustic device through the pressure relief hole 101. Preferably, the vibration direction of the vibration diaphragm of the sound emitting unit 10 is parallel to the thickness direction of the acoustic device, which facilitates the slim design of the acoustic device.
Further, as shown in fig. 2, the acoustic device includes a first housing 11 and a second housing 12, the first housing 11 and the diaphragm enclose a first sealed cavity 16, and a second sealed cavity 17 is disposed outside the first sealed cavity 16. The second closed cavity 17 is formed by enclosing the second shell 12 and the first shell 11, the first closed cavity 16 is adjacent to the vibrating diaphragm, and the second closed cavity 17 is far away from the vibrating diaphragm. In order to solve the problems that the sensitivity effect of improving the low frequency band by using a single sound-absorbing material is poor and the frequency band which can be improved by using a single passive radiator structure is limited in the prior art, in the present invention, as shown in fig. 5, a mounting hole 22 is formed on a first housing 11, a flexible deformation portion 13 which covers the mounting hole 22 is arranged at the mounting hole 22, wherein at least part of the flexible deformation portion 13 is flexibly deformed, and the flexible deformation portion 13 is located between a first closed cavity 16 and a second closed cavity 17. When the vibrating diaphragm vibrates, the sound pressure inside the first sealed cavity 16 changes, and the flexible deformation part 13 on the first shell 11 deforms along with the change of the sound pressure inside the first sealed cavity 16, so that the first sealed cavity 16 is a flexible cavity and the volume of the first sealed cavity is variable.
In one embodiment, as shown in fig. 2, a first air-permeable partition 15 covering the mounting hole 22 is disposed at the mounting hole 22, and the first air-permeable partition 15 is located in the first closed cavity 16, and the distance between the first air-permeable partition 15 and the flexible deformation portion 13 is configured such that the flexible deformation portion 13 does not collide with the first air-permeable partition 15 when deformed, so as to avoid affecting the normal vibration of the flexible deformation portion 13. As shown in fig. 3, a second air-permeable partition 23 is disposed in the first closed cavity 16, a sound-absorbing material (not shown) is filled in the first closed cavity 16, the first air-permeable partition 15 is used for isolating the sound-absorbing material from the flexible deformation portion 13, and the second air-permeable partition 23 is used for preventing the sound-absorbing material from entering the inner space of the sound generating unit 10. Therefore, the space for filling the sound-absorbing material is larger, the equivalent volume of the closed cavity is enlarged, and the sound compliance effect is improved.
Specifically, the sound-absorbing material is sound-absorbing particles bonded by an adhesive.
Further, one side of the flexible deformation part 13, which is located in the second airtight cavity 17, is covered with a protection device 14 to protect the flexible deformation part 13 from being damaged. As shown in fig. 7, the protection device 14 is provided with a vent 141 for equalizing air pressure at both sides of the protection device 14. Preferably, the protective device 14 is a steel mesh, and the overall thickness can be reduced based on the steel mesh design, which is beneficial to reducing the thickness of the acoustic device. The steel mesh will be described as an example.
Specifically, as shown in fig. 1, 2 and 7, the first housing 11 is recessed to form an installation groove 19 in a direction of the first sealed cavity 16 corresponding to the flexible deformation portion 13, the first housing 11 includes an upper shell 111 and a lower shell 112, the upper shell 111, the lower shell 112 and the sound generating unit 10 are enclosed to form the first sealed cavity 16, the upper shell 111 is recessed to form an installation groove 19 in a direction of the first sealed cavity 16 corresponding to the flexible deformation portion 13, and the flexible deformation portion 13 is disposed at a groove bottom of the installation groove 19. The protective device 14 does not exceed the plane of the notch of the mounting groove 19, so that the contact probability of the external part to the flexible deformation part 13 is greatly reduced, and meanwhile, the scratch is prevented.
As shown in fig. 6, the steel net includes a fixing portion 142, a bottom portion 144 and a side portion 143, the side portion 143 is disposed on the periphery of the bottom portion 144, one end of the side portion 143 in the axial direction is combined and fixed with the bottom portion 144, the fixing portion 142 is disposed on the periphery of the other end of the side portion 143 in the axial direction, the bottom portion 144 and the side portion 143 form a cover corresponding to the flexible deformation portion 13 and are mounted on the first housing 11 through the fixing portion 142, and the steel net can be regarded as a basin shape substantially, the fixing portion 142 is a "basin rim", the bottom portion 144 is a "basin bottom". The side portions 143 and the bottom portion 144 may constitute a part of the vibration space of the flexible deformation portion 13. The distance between the bottom 144 and the flexible deformation 13 is set so that the flexible deformation 13 does not collide with the steel mesh when deformed. The steel mesh is provided with air holes 141 for equalizing sound pressure at both sides of the steel mesh.
The steel mesh can prevent that outside object from destroying, damaging flexible deformation portion 13, and when flexible deformation portion 13 vibrated deformation simultaneously, the steel mesh played certain damping effect to the deformation of flexible deformation portion 13, made flexible deformation portion 13 warp along with the acoustic pressure, when adjusting first airtight chamber 16 compliance, can reduce the interference to the acoustic device complete machine, can reduce the interference to the applied electronic equipment complete machine of acoustic device even.
Specifically, the steel mesh sets up in one side that flexible deformation portion 13 is located second airtight chamber 17, and the bottom 144 of steel mesh still plays protection and dustproof effect to flexible deformation portion 13 to and certain damping effect when there is certain distance in order to guarantee flexible deformation portion 13 deformation space with flexible deformation portion 13.
In another embodiment, the number of the first breathable spacers 15 is two, the two sides of the flexible deformation portion 13 corresponding to the first sealed cavity 16 and the second sealed cavity 17 are covered with the first breathable spacers 15 to separate the sound-absorbing material from the flexible deformation portion 13, the first sealed cavity 16 is provided with the second breathable spacers 23 to prevent the sound-absorbing material from entering the sound-generating unit 10, and the first sealed cavity 16 is filled with sound-absorbing particles. In this way, the sound-absorbing material is also provided in the second sealed cavity 17, further increasing the equivalent volume of the sealed cavity.
In the present invention, the first air-permeable barrier 15 and/or the second air-permeable barrier 23 may be constituted by a single air-permeable mesh. In a specific example, the first air-permeable partition 15 and/or the second air-permeable partition 23 may be a metal mesh, which may enhance the strength and durability of the first air-permeable partition 15 and/or the second air-permeable partition 23, or may be a mesh or a breathable film, and the material of the first air-permeable partition 15 and the second air-permeable partition 23 is not limited in the present invention.
Alternatively, the first air-permeable barrier 15 may be a set of barrier components comprising a frame injection-molded on the first casing 11, on which the above-mentioned air-permeable mesh is incorporated by means of adhesive or by means of integral injection molding. Furthermore, the first ventilation isolation member 15 may be a hard partition plate, and a plurality of ventilation holes 141 may be formed in the partition plate, and it is understood that the aperture of the ventilation holes 141 in the partition plate should be smaller than the minimum particle size of the sound-absorbing material in order to prevent the sound-absorbing material from contacting the flexible deformation portion 13 and the sound-emitting unit 10.
As shown in fig. 5, the first air-permeable partition 15 is fixed to the upper shell 111 by gluing, or, as shown in fig. 6, the first air-permeable partition 15 is fixed to the upper shell 111 by injection molding, or, as shown in fig. 7, the first air-permeable partition 15 is fixed to the upper shell 111 by hot melting, wherein the upper shell 111 is provided with a hot-melt rib 21, and the first air-permeable partition 15 is fixed to the upper shell 111 by heating the hot-melt rib 21.
The gluing mode, the injection molding mode and the hot melting mode can well combine the first breathable isolating piece 15 and the first shell 11 together, so that the first breathable isolating piece 15 is not easy to loosen and fall off. Particularly, when the sound-absorbing material is filled, the first air-permeable partition 15 is firmly fixed, which is beneficial to filling the sound-absorbing material.
The sound absorbing material can be made of any one or more of activated carbon, zeolite, silicon dioxide (SiO2), alumina (Al2O3), zirconium oxide (ZrO2), magnesium oxide (MgO), ferroferric oxide (Fe3O4), molecular sieves, spherical shell-shaped carbon molecules, carbon nano tubes and sound absorbing cotton.
Specifically, as shown in fig. 2, the volume of the second closed chamber 17 is larger than the volume of the first closed chamber 16 in the present invention.
When the vibrating diaphragm vibrates, the sound pressure in the first closed cavity 16 changes, the flexible deformation part 13 deforms along with the change of the sound pressure in the first closed cavity 16, and the flexible adjustment of the volume of the first closed cavity 16 is carried out; the second closed cavity 17 encloses the sound wave generated when the flexible deformation part 13 is deformed in the second closed cavity 17.
In one example, as shown in fig. 1 and 3, the sound unit 10 includes a pressure relief hole 101, and the second air-permeable partition 23 covers the pressure relief hole 101. More specifically, the pressure relief hole 101 is formed in the side wall of the sound generating unit 10, so that the material area of the second air-permeable partition 23 is small, and the cost can be further saved.
Further, the second air-permeable partition 23 is coupled to the sidewall of the sound unit 10 by injection molding. Therefore, the space of the first closed cavity 16 filled with the sound-absorbing material is further expanded to improve the product performance; in addition, the surface area of the second air-permeable partition 23 is small, so that the material cost is saved, and the second air-permeable partition 23 can be fixed on the sound generating unit 10 by gluing. Alternatively, the second air-permeable partition 23 may be a set of partition components including a frame molded on the sound unit 10, and the second air-permeable partition 23 is bonded to the frame by adhesive or integrally molded. Further, the second air-permeable partition 23 may be a hard partition plate, and a plurality of air holes 141 may be formed in the partition plate, and it is understood that the aperture of the air holes 141 in the partition plate should be smaller than the minimum particle size of the sound-absorbing material in order to prevent the sound-absorbing material from entering the inner space of the sound unit 10.
In another embodiment, as shown in fig. 4, the second air-permeable partition 23 is fixed to the first casing 11 to separate the sound-absorbing material from the sound-generating unit 10, and the sound-absorbing material is filled in a space surrounded by the first air-permeable partition 15, the second air-permeable partition 23, and the first casing 11.
In the present invention, at least a part of the housing of the electronic equipment for mounting the acoustic device is used to form the first closed chamber 16 and/or the second closed chamber 17. The electronic device can be a mobile phone, a tablet computer, a notebook computer and the like. That is, a part or the whole of the first casing 11 is formed by a housing of the electronic device, a part or the whole of the second casing 12 is formed by a housing of the electronic device, or a part or the whole of the first casing 11 and the second casing 12 is formed by a housing of the electronic device. The shell of the electronic device is used as the first shell 11 and/or the second shell 12, so that the space inside the electronic device can be fully utilized, and meanwhile, the space occupied by a part of the first shell 11 and/or the second shell 12 is saved, which is more beneficial to the thin design of the electronic device.
Further, the part of the outer shell is used for forming the second shell 12, namely the part of the outer shell and the first shell 11 enclose to form a second closed cavity, and the product assembly is simpler.
It should be noted that the "closed" described in this embodiment and the present invention may be a fully closed physical structure, or may be in a relatively closed state, for example, the first closed cavity 16 may include a pressure equalizing hole 18 that is provided to balance internal and external air pressures and has no significant influence on rapid change of sound pressure based on the use requirement of the product, or other open structures, and may also be regarded as a closed cavity. For example, the second sealed cavity 17 may include a slit or the like formed when combined with the first sealed cavity 16, and a slit or the like having its own structure, which can effectively isolate the sound wave generated by the flexible deformation portion 13, and which does not significantly affect the sound wave generated by the sound generating unit 10, and which is also regarded as a sealed cavity. Typically, the total area of the openings or slits does not exceed 20mm2
In one embodiment, as shown in fig. 2, the sound generating unit 10 is mounted on the first housing 11 to form a sound generating assembly, and a first sealed cavity 16 is formed between the diaphragm of the sound generating unit 10 and the first housing 11; the sounding component is arranged in the second shell 12, and a second closed cavity 17 is formed between the second shell 12 and the first shell 11; the first housing 11 is provided with a flexible deformation portion 13. However, when other components are present in the second casing 12, the second sealed chamber 17 is actually formed by the components and the gap between the second casing 12 and the first casing 11.
In this embodiment, the sound generating unit 10 is disposed inside the first housing 11, and both are formed as an integral structure, and then assembled with the second housing 12. The first housing 11 is provided with an opening with which the diaphragm front side space communicates, through which sound is radiated to the sound outlet 20 of the acoustic device.
Further, the acoustic device is installed in the electronic equipment of the mobile phone, and the housing of the electronic equipment doubles as the second casing 12 of the acoustic device. The space between the outer shell of the electronic equipment and the internal parts and the space between the outer shell of the electronic equipment and the first shell 11 of the acoustic device form a second closed cavity 17, the second shell 12 of the acoustic device is omitted, the gap space between the outer shell parts of the electronic equipment is fully utilized, and the maximum design of the second closed cavity 17 can be realized.
When the acoustic device is in a working state, when the vibrating diaphragm vibrates downwards to compress the volume at the rear side of the vibrating diaphragm, sound pressure is transmitted to the flexible deformation part 13 through the first closed cavity 16, and the flexible deformation part 13 expands and deforms towards the outer side of the first closed cavity 16; on the contrary, when the diaphragm vibrates upwards, the flexible deformation part 13 will contract inwards to deform, so as to adjust the volume of the first closed cavity 16. The flexible deformation portion 13 may be made of plastic or thermoplastic elastomer, or may be made of silicone rubber, or may be a single layer or a multi-layer composite structure, and the flexible deformation portion 13 may have a flat body, or a structure with a portion of protrusion or recess, such as a structure with a protrusion at the central portion and a protrusion at the edge portion, or a structure with a protrusion at the central portion and a protrusion at the edge portion combined together. Specifically, all or part of the flexible deformation part 13 is at least one of TPU, TPEE, LCP, PAR, PC, PA, PPA, PEEK, PEI, PEN, PES, PET, PI, PPS, PPSU, and PSU. And the thickness of the flexible deformation part 13 is less than or equal to 0.5mm, and the thickness is too thick, so that the strength of the flexible deformation part is increased, the compliance is reduced, and the deformation is not facilitated.
Further, in order to improve the vibration effect, a composite sheet can be superimposed on the middle part of the body of the flexible deformation part 13, the strength of the composite sheet is higher than that of the body, and the composite sheet can be metal, plastic, carbon fiber or a composite structure thereof and the like. In addition, the body of the flexible deformation part 13 may be a sheet-shaped integral structure, or a structure with a hollowed middle part and a composite sheet, and when the hollowed middle part of the body of the flexible deformation part 13 only retains an edge part, the edge part may be flat, or convex toward one side, or wavy.
Preferably, the flexible deformation portion 13 is integrally combined with other portions of the first housing 11, and as a specific scheme, the flexible deformation portion 13 may be manufactured first, and then the flexible deformation portion 13 is integrally injection-molded in other portions as an insert.
In the present invention, the main bodies of the first closed chamber 16 and the second closed chamber 17 extend in the horizontal direction constituted by the length and width of the acoustic device, and the horizontal direction may be defined as a direction perpendicular to the thickness direction of the acoustic device. The horizontal direction generally refers to the direction parallel to the horizontal plane when the acoustic device is placed on the horizontal plane, and the two chambers are arranged along the horizontal direction, so that the space in the height direction of the acoustic device is not occupied as much as possible, and the thinning design of a product is facilitated.
In the acoustic device, a closed cavity at the rear side of a vibrating diaphragm is divided into a first closed cavity 16 and a second closed cavity 17 through a first shell 11, a flexible deformation part 13 is arranged on the first shell 11, the flexible deformation part 13 deforms along with sound pressure through the arrangement of the flexible deformation part 13, and the volume of the first closed cavity 16 is adjustable, so that the equivalent acoustic compliance of the first closed cavity 16 is increased, the resonance frequency of the acoustic device is effectively reduced, and the low-frequency sensitivity is improved; the sound radiation that produces among the isolated flexible deformation portion 13 deformation process of second airtight chamber 17, seal the radiation sound wave of flexible deformation portion 13 inside acoustic device, avoid the sending phase place radiation sound wave of flexible deformation portion 13, cause the offset influence to the forward radiation sound wave of sound generating unit 10, and then the low band sensitivity of product is promoted to great amplitude on the whole.
And, the volume of second airtight chamber 17 is greater than the volume of first airtight chamber 16, can make flexible deformation portion 13's deformation easier, is favorable to increasing first airtight chamber 16 equivalent acoustic compliance more, effectively reduces acoustic device resonant frequency, promotes low frequency sensitivity.
In addition, the invention also discloses electronic equipment, wherein the acoustic device is arranged on the electronic equipment, and the electronic equipment can be a mobile phone, a tablet computer, a notebook computer and the like.
The electronic device comprises an outer envelope, at least a part of which is intended to form a first closed chamber 16 and/or a second closed chamber 17. That is, a part or the whole of the first casing 11 is formed by a housing of an electronic device, a part or the whole of the second casing 12 is formed by a housing of an electronic device, or a part or the whole of the first casing 11 and the second casing 12 is formed by a housing of an electronic device. In the invention, the shell of the electronic device is used as the first shell 11 and/or the second shell 12, so that the space in the electronic device can be utilized, and the space occupied by a part of the first shell 11 and/or the second shell 12 can be saved, thereby being more beneficial to the thin design of the electronic device.
Specifically, the acoustic device includes a first casing 11, a sound generating unit 10 is mounted on the first casing 11 to form a sound generating assembly, a first sealed cavity 16 is formed between a diaphragm of the sound generating unit 10 and the first casing 11, wherein a flexible deformation portion 13 is arranged on the first casing 11; the acoustic device further comprises a second housing 12, the sound generating assembly being mounted in the second housing 12, a second closed cavity 17 being formed between the second housing 12 and the first housing 11. The second casing 12 is a housing of the electronic device. In fact, the space between the electronic equipment shell and the internal parts and the space between the electronic equipment shell and the first shell 11 of the acoustic device form a second closed cavity 17, the electronic equipment shell is also used as the second shell 12 of the acoustic device, the second shell 12 of the acoustic device is omitted, the gap space between the electronic equipment shell parts is fully utilized, the maximized design of the second closed cavity 17 can be realized, and the thinned design of the electronic equipment is facilitated.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (12)

1. An acoustic device, comprising:
the sound production unit comprises a vibrating diaphragm, a sound outlet is formed in the acoustic device, and sound waves on the front side of the vibrating diaphragm radiate outwards through the sound outlet;
the vibration diaphragm is enclosed to form a first closed cavity, a mounting hole is formed in the first shell, a flexible deformation part covering the mounting hole is arranged at the mounting hole, a second closed cavity is arranged on the outer side of the first closed cavity, the flexible deformation part is located between the first closed cavity and the second closed cavity, and sound waves generated by the flexible deformation part during deformation are sealed in the second closed cavity by the second closed cavity;
mounting hole department is equipped with the cover the first ventilative separator of mounting hole, first ventilative separator is located first airtight intracavity, first ventilative separator with distance between the flexible deformation portion is configured into flexible deformation portion can not with first ventilative separator bumps mutually when deformation, be equipped with the ventilative separator of second in the first airtight chamber, it has sound absorbing material to fill in the first airtight chamber, first ventilative separator is used for keeping apart sound absorbing material with flexible deformation portion, the ventilative separator of second is used for avoiding sound absorbing material gets into the sound producing unit.
2. The acoustic device according to claim 1, wherein the sound absorptive material is made of one or more of activated carbon, zeolite, silica (SiO2), alumina (Al2O3), zirconia (ZrO2), magnesia (MgO), triiron tetroxide (Fe3O4), molecular sieves, fullerene-like carbon molecules and carbon nanotubes, and sound absorptive cotton.
3. The acoustic device according to claim 1, wherein all or part of the area of the flexibly deformable portion is at least one of TPU, TPEE, LCP, PAR, PC, PA, PPA, PEEK, PEI, PEN, PES, PET, PI, PPS, PPSU, PSU, rubber or silicone.
4. The acoustic device according to any one of claims 1 to 3, wherein the sound-absorbing material is formed into a plurality of sound-absorbing particles by an adhesive.
5. The acoustic device according to claim 1, wherein the edge of the first breathable barrier is integrated with the first casing by gluing; alternatively, the first and second electrodes may be,
the edge of the first breathable isolating piece and the first shell are combined into a whole in an injection molding mode; alternatively, the first and second electrodes may be,
the edge of the first breathable isolating piece and the first shell are combined into a whole in a hot melting mode.
6. The acoustic device of claim 1, wherein the first and/or second breathable spacers are a mesh, a metal mesh, or a breathable membrane.
7. The acoustic device of claim 1, wherein the sound generating unit comprises a pressure relief vent, the pressure relief vent being covered with the second breathable spacer.
8. The acoustic device of claim 7, wherein the pressure relief hole is located on a side wall of the sound emitting unit.
9. The acoustic device of claim 8, wherein the second breathable separator is injection molded to the sidewall.
10. The acoustic device of claim 1, wherein the second breathable barrier is secured to the first housing.
11. An electronic device, characterized in that the electronic device comprises an enclosure and an acoustic device according to any of claims 1-10, at least a part of the enclosure being adapted to form the first closed cavity and/or the second closed cavity.
12. The electronic device of claim 11, wherein a portion of the housing encloses the first housing to form the second enclosed cavity.
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