CN115175053A - Shell of sound generating device, sound generating device and electronic equipment - Google Patents
Shell of sound generating device, sound generating device and electronic equipment Download PDFInfo
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- CN115175053A CN115175053A CN202210772385.8A CN202210772385A CN115175053A CN 115175053 A CN115175053 A CN 115175053A CN 202210772385 A CN202210772385 A CN 202210772385A CN 115175053 A CN115175053 A CN 115175053A
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- shell
- sound
- sound generating
- housing
- zeolite filler
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- 239000000945 filler Substances 0.000 claims abstract description 86
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 85
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 85
- 239000010457 zeolite Substances 0.000 claims abstract description 85
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- 239000010703 silicon Substances 0.000 claims description 8
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- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 3
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
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- 239000013078 crystal Substances 0.000 claims description 2
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- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 claims 2
- 239000004697 Polyetherimide Substances 0.000 claims 2
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- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 claims 2
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 claims 2
- 239000004417 polycarbonate Substances 0.000 claims 2
- 229920001601 polyetherimide Polymers 0.000 claims 2
- 229920000515 polycarbonate Polymers 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 229920005575 poly(amic acid) Polymers 0.000 description 35
- 150000003839 salts Chemical class 0.000 description 34
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- 239000004642 Polyimide Substances 0.000 description 25
- 229920001721 polyimide Polymers 0.000 description 25
- 239000002808 molecular sieve Substances 0.000 description 22
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 22
- 230000000052 comparative effect Effects 0.000 description 18
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- 229910052680 mordenite Inorganic materials 0.000 description 9
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- CBCKQZAAMUWICA-UHFFFAOYSA-N 1,4-phenylenediamine Chemical compound NC1=CC=C(N)C=C1 CBCKQZAAMUWICA-UHFFFAOYSA-N 0.000 description 1
- CWFXFZKQVWETGV-UHFFFAOYSA-N 2-[3,5-bis(2-aminophenoxy)phenoxy]aniline Chemical compound NC1=CC=CC=C1OC1=CC(OC=2C(=CC=CC=2)N)=CC(OC=2C(=CC=CC=2)N)=C1 CWFXFZKQVWETGV-UHFFFAOYSA-N 0.000 description 1
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 1
- GTDPSWPPOUPBNX-UHFFFAOYSA-N ac1mqpva Chemical compound CC12C(=O)OC(=O)C1(C)C1(C)C2(C)C(=O)OC1=O GTDPSWPPOUPBNX-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/02—Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention discloses a shell of a sound production device, wherein a front sound cavity and a rear sound cavity are arranged in the shell, the part of the shell corresponding to the rear sound cavity is formed into a rear cavity shell, at least one part of the rear cavity shell is formed into a functional shell, and the functional shell comprises an organic aerogel base material and zeolite filler distributed in the organic aerogel base material; the organic aerogel substrate has a porous structure, the zeolite filler is filled in the porous structure, the particle size of the zeolite filler is 0.1-30 μm, and the modulus of the functional shell is 0.8-20 GPa. The functional shell prepared from the organic aerogel substrate and the zeolite filler can reduce the resonance frequency of the sound generating device, improve the low-frequency sensitivity and improve the structural strength of the shell of the sound generating device when the functional shell is applied to the sound generating device.
Description
Technical Field
The invention relates to the technical field of electronic equipment, in particular to a shell of a sound generating device, the sound generating device and the electronic equipment.
Background
With the development of science and technology, electronic products are more and more widely applied, and under the trend that electronic products are increasingly lighter and thinner, the position space reserved for the loudspeaker is smaller and smaller. The volume of the acoustic rear cavity of the loudspeaker module is reduced due to the flat design of the miniature loudspeaker module, and the reduction of the volume of the acoustic rear cavity can reduce the low-frequency performance of the loudspeaker and influence the sound production effect of the loudspeaker.
In the prior art, the rear sound cavity of the speaker is usually filled with sound-absorbing particles having a porous structure to reduce the resonant frequency of the speaker and improve the low-frequency sensitivity. However, as the space of the loudspeaker is further reduced, the space left for filling the sound-absorbing particles is seriously insufficient, and the required reduction of the resonance frequency of the loudspeaker is not enough.
In order to solve the above problems, a material with sound absorption function is provided for preparing a shell, although the shell has a certain sound absorption effect, the problem that the filling space of the sound absorption material is not enough can be solved to a certain extent, but the structural strength of the shell is too low to meet the strength requirement of the actual use of the loudspeaker, thereby affecting the practical performance of the shell.
It should be appreciated that the foregoing provides background information related to the invention and is not necessarily prior art to the present invention.
Disclosure of Invention
An object of the present invention is to provide a new technical solution for a casing of a sound generating device, a sound generating device and an electronic apparatus.
According to a first aspect of the present invention, there is provided a housing of a sound generating device, the housing having a front sound cavity and a rear sound cavity therein, a portion of the housing corresponding to the rear sound cavity being formed as a rear cavity housing, at least a portion of the rear cavity housing being formed as a functional housing, the functional housing comprising an organic aerogel substrate and a zeolite filler distributed in the organic aerogel substrate;
the organic aerogel substrate has a porous structure, the zeolite filler is filled in the porous structure, the particle size of the zeolite filler is 0.1-30 μm, and the modulus of the functional shell is 0.8-20 GPa.
Optionally, the zeolite filler has a particle size of 0.5 μm to 3 μm.
Optionally, the zeolitic filler has a crystalline structure of at least one of FER, MFI, MOR, CHA, IHW, UTL, ITE, MTW, VET.
Optionally, the mass ratio of silicon to aluminum in the zeolite filler is greater than or equal to 50.
Optionally, the zeolite filler has a density of 1.9g/cm 3 ～2.3g/cm 3 。
Optionally, the zeolite filler is spherical, spheroidal, rod-like, square, or irregularly shaped.
Optionally, the mass of the zeolite filler is 10% to 50% of the total mass of the functional shell.
Optionally, the organic aerogel material in the organic aerogel substrate is at least one of imides, polyamides, polyesters, aldehydes, polyolefins, polysaccharides, and silicones.
Optionally, the functional housing further comprises a fiber reinforcement material, the fiber reinforcement material being at least one of carbon fiber, glass fiber, ceramic fiber and aramid fiber.
Optionally, the rear chamber housing is entirely comprised of the functional housing.
Optionally, the rear cavity housing is further formed with a main body portion, and the main body portion and the functional housing are integrally injection-molded or adhesively connected.
Optionally, a part of the housing corresponding to the front acoustic cavity is a front cavity shell, and the front cavity shell is spliced or assembled with the rear cavity shell in an adhering manner;
the main body part and the front cavity shell are respectively prepared from at least one of PC and modified materials thereof, PA and modified materials thereof, PPS and modified materials thereof, PP and modified materials thereof, ABS and modified materials thereof, LCP and modified materials thereof, PEI and modified materials thereof, phenolic resin and modified materials thereof, epoxy resin and modified materials thereof, unsaturated polyester and modified materials thereof, stainless steel, aluminum alloy, magnesium alloy and metal matrix composite materials.
According to a second aspect of the present invention, there is provided a sound emitting device comprising: the housing of the sound emitting device of the first aspect.
According to a third aspect of the present invention, there is provided an electronic apparatus comprising: the sound generating device according to the second aspect.
According to one embodiment of the invention, one technical effect of the invention is as follows:
according to the invention, the functional shell is prepared by adopting the organic aerogel substrate and the zeolite filler, and the zeolite filler and the organic aerogel substrate both have porous structures, so that the sound absorption performance of the functional shell can be improved, and when the functional shell is applied to a sound production device, the resonance frequency of the sound production device can be reduced, and the low-frequency sensitivity can be improved.
Moreover, when filling the zeolite filler in the porous structure of organic aerogel, the zeolite filler has the reinforcement effect to the overall structure intensity of organic aerogel base member for the shell of the sound generating device who prepares can both satisfy the intensity demand, can guarantee again to inhale the sound performance.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, 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 a schematic structural diagram of a sound generating device provided by the present invention.
FIG. 2 is a schematic representation of an organic aerogel substrate containing an acoustic enhancement filler according to the present invention.
Figure 3 is a graph comparing the IMP curves for the shells provided by example 1 and comparative example 2 provided by the present invention.
Fig. 4 is a graph comparing the FR curves of the skin provided by example 1 and the skin provided by comparative example 2.
Description of the reference numerals:
10. a housing; 11. a front cavity housing; 111. a front acoustic chamber; 12. a rear chamber housing; 121. a rear acoustic chamber; 122. an organic aerogel substrate; 123. a porous structure; 124. a zeolite filler; 20. a sounding monomer.
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 one 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.
As shown in fig. 1 to 2, the present invention provides a housing 10 of a sound generating apparatus, the housing 10 has a front sound cavity 111 and a rear sound cavity 121 therein, a portion of the housing 10 corresponding to the rear sound cavity 121 is formed as a rear cavity casing 12, at least a portion of the rear cavity casing 12 is formed as a functional casing, and the functional casing includes an organic aerogel substrate 122 and a zeolite filler 124 distributed in the organic aerogel substrate 122; the organic aerogel substrate 122 has a porous structure 123, the zeolite filler 124 is filled in the porous structure 123, the particle size of the zeolite filler 124 is 0.1 μm to 30 μm, and the modulus of the functional shell is 0.8GPa to 20GPa.
Specifically, referring to fig. 1, the housing 10 of the sound generating device plays a certain role in protecting the sound generating device, and therefore, in actual production, the strength design of the housing 10 needs to meet certain requirements. In addition, the sounding monomer 20 is arranged in the housing 10 and is matched with the housing 10 to form a front sound cavity 111 and a rear sound cavity 121, the part of the housing 10 corresponding to the front sound cavity 111 is a front cavity shell 11, the part of the housing 10 corresponding to the rear sound cavity 121 is a rear cavity shell 12, the volume of the rear sound cavity 121 has influence on the low-frequency sensitivity of the sounding device to a certain extent, the larger the volume of the rear sound cavity 121 is, the better the effect of reducing the resonance frequency of the sounding device is, that is, the low-frequency sensitivity of the sounding device can be improved, and the sounding effect can be further improved.
In this embodiment, the housing 10 of the sound generating apparatus includes a functional case, and the functional case is prepared by using an organic aerogel matrix and zeolite filler 124. The organic aerogel matrix is prepared from high-molecular organic materials, such as polyimides, polyamides, polyesters, aldehydes, polyolefins, polysaccharides, organosilicones, and the like, and the prepared organic aerogel matrix has a staggered network structure, namely a porous structure 123, so that on one hand, the effect of increasing the virtual volume of the rear sound cavity 121 can be achieved, and on the other hand, an accommodating space is provided for the zeolite filler 124. The zeolite filler 124 serving as an acoustic improvement material in the invention also has a porous structure 123, the porous structure 123 of the zeolite filler 124 further increases the virtual volume of the rear sound cavity 121, and the zeolite filler and the organic aerogel matrix together play a role in reducing the resonance frequency, thereby improving the acoustic effect of the sound production device.
On the other hand, zeolite filler 124's structural performance is stable itself, can strengthen the structural strength of organic aerogel base member when filling it in organic aerogel, has compensatied organic aerogel and has leaded to its structural strength low shortcoming owing to have porous structure 123 for the functional housing of preparation can satisfy inhales the sound demand, improves sound generating mechanism's acoustic performance, can compromise the structural strength of shell 10 again, improves shell 10 and to sound generating mechanism's guard action. Further, the particle size of the zeolite filler 124 has a certain influence on the sound absorption effect and the structural strength of the functional housing. If the particle size distribution of the zeolite filler 124 is wide, it is not favorable for the zeolite filler to be uniformly distributed in the organic aerogel substrate 122, which affects the filling effect.
In one embodiment, the zeolite filler 124 may be mordenite or a ZSM-5 molecular sieve, the modulus of the functional shell using mordenite can reach 3800MPa, and the modulus of the functional shell using the ZSM-5 molecular sieve can reach 3600MPa, which both greatly improve the structural stability of the sound generator housing 10.
In addition, the higher the modulus of the functional housing, the higher the strength and structural stability thereof, but if the modulus is too high, the waste of the margin of rigidity is caused, increasing the production cost; if the modulus is lower, the functional case may not meet the rigidity requirement, and the modulus of the functional case is limited to 0.8GPa to 20GPa, for example, 0.8GPa, 0.9GPa, 1GPa, 2GPa, 5GPa, 10GPa, 15GPa, 20GPa, etc. Preferably, the modulus of the functional shell is 2GPa to 10GPa, and the adjustment of the modulus of the functional shell in this range can be achieved by adjusting the ratio of the zeolite filler 124 to the mass of the functional shell, or by adding an auxiliary material to the organic aerogel substrate 122, which is not limited by the present invention.
In actual production, the organic aerogel generates a criss-cross porous network structure, i.e. the porous structure 123, during the growth process, the zeolite filler 124 needs to be uniformly embedded in these porous structures 123, and if the particle size of the zeolite filler 124 is too large, the normal growth of the organic aerogel substrate 122 is easily affected, and the stability of the functional shell structure is damaged. Controlling the particle size of the zeolite filler 124 within the range of 0.1 μm to 30 μm allows the zeolite filler 124 to be more easily embedded in the porous structure 123 of the organic aerogel substrate 122 without affecting the normal growth structure of the organic aerogel substrate 122. The organic aerogel porous structure 123 can have a plurality of zeolite filler 124 particles embedded therein, the particles having a size range that can substantially match the size of the organic aerogel produced porous structure 123.
Alternatively, the particle size of the zeolite filler 124 is 0.5 μm to 3 μm, such as 0.5 μm, 0.6 μm, 0.8 μm, 0.9 μm, 1 μm, 1.2 μm, 1.5 μm, 1.8 μm, 2 μm, 2.5 μm, 3 μm, and the like. The zeolite filler 124 with the above particle size can be filled in the porous structure 123 of the organic aerogel to cover more smaller void structures, thereby further improving the structural strength of the organic aerogel.
Optionally, the zeolitic filler 124 has a crystalline structure of at least one of FER, MFI, MOR, CHA, IHW, UTL, ITE, MTW, VET.
Specifically, the zeolite filler 124 has a plurality of different crystal structures, and in actual production, one of the structures may be selected according to actual requirements, or several structures may be selected for mixing, which is not limited by the present invention. Preferably, the zeolite filler 124 has a crystalline structure of FER and/or MFI.
Optionally, the mass ratio of silicon to aluminum in the zeolite filler 124 is greater than or equal to 50.
Specifically, the mass ratio of silicon and aluminum in the zeolite filler 124 affects the polarity of the zeolite, and the higher the polarity of the zeolite, the higher the water absorption rate of the zeolite, which ultimately results in the increase of the water absorption rate of the housing 10 of the prepared sound emitting device, which is inconvenient for its storage in a high humidity environment. In the present embodiment, the mass ratio of silicon to aluminum in the zeolite filler 124 is defined to be greater than or equal to 50, for example, 50, 55, 60, 70, 80, etc., and the mass ratio of silicon to aluminum can reduce the polarity of the zeolite, so that the water absorption of the functional housing is reduced, and the environmental compatibility of the sound device case 10 is improved. In addition, the mass ratio of silicon to aluminum in the zeolite filler 124 also affects the structural stability of the zeolite itself, and when the mass ratio of silicon to aluminum is limited to the above numerical range, the structural stability is high, which is beneficial to improving the acoustic performance of the sound generating device.
Alternatively, the zeolite filler 124 has a density of 1.9g/cm 3 ～2.3g/cm 3 。
Specifically, the density of the zeolite filler 124 has a certain influence on the sound absorbing effect of the casing 10 of the finally manufactured sound emitting device. If the density of the zeolite filler 124 is too low, this will result in a lower upper limit of the amount of the acoustic improvement filler added to the shell 10, so that the shell 10 will not achieve an effective acoustic improvement effect, while if the density of the zeolite filler 124 is too high, this will result inThe absorption or desorption of the filler to air molecules is improved, and the sound absorption effect is influenced. When the density of the zeolite filler 124 is 1.9g/cm 3 ～2.3g/cm 3 When the sound-absorbing device is used internally, a better sound-absorbing effect can be achieved, and the acoustic effect of the sound-generating device is improved. For example, the zeolite filler 124 may have a density of 1.9g/cm 3 、2g/cm 3 、2.1g/cm 3 、2.2g/cm 3 、2.3g/cm 3 、2.4g/cm 3 、2.5g/cm 3 And the like.
Alternatively, the zeolite filler 124 may be spherical, spheroidal, rod-like, square, or irregular in shape.
In particular, the shape of the zeolite filler 124 also has some effect on the sound absorption effect of the finally formed functional housing. The shape of the zeolite filler 124 can be selected based on the shape of the porous structure 123 created by the organic aerogel substrate 122 such that the zeolite filler 124 can more uniformly fill the porous structure 123 to improve its acoustic properties. In practical application, the zeolite filler 124 has different types and different shapes, and the different shapes have different effects on the sound absorption effect of the material itself, and can be specifically selected according to the actual requirements of the sound generating device, so as to improve the sound absorption effect of the functional shell as much as possible.
Optionally, the mass of the zeolite filler 124 accounts for 10% to 50% of the total mass of the functional shell.
Specifically, the ratio of the mass of the zeolite filler 124 to the total mass of the functional housing has a certain influence on the sound absorbing effect of the functional housing. If the occupancy of the zeolite filler 124 is too low, the sound absorption effect of the functional housing cannot be satisfied. If the proportion of the zeolite filler 124 is too high, the mass of the entire housing 10 is affected, which is disadvantageous for the slim design of the sound generating device. The invention limits the accounting ratio of the acoustic improvement filler to 10-50%, and can not only consider the quality and the structural stability of the sound generating device, but also consider the sound absorption effect of the functional shell, thereby realizing the purpose of reducing the resonant frequency of the sound generating device.
Optionally, the organic aerogel material in organic aerogel substrate 122 is at least one of imides, polyamides, polyesters, aldehydes, polyolefins, polysaccharides, and silicones.
Specifically, the aerogel refers to a nanoscale porous solid material formed by replacing a liquid phase in a gel with gas in a certain drying manner by a sol-gel method, and the aerogel also has the property of a gel. In the present invention, the organic aerogel substrate 122 is an aerogel made of a polymer organic material, has the characteristics of being porous and light, has a certain structural strength, and is suitable for manufacturing the housing 10 of the sound generating device with certain mechanical requirements. In practical application, one or more of the organic polymer materials can be selected according to the practical requirements of the functional shell.
Optionally, the functional housing further comprises a fiber reinforcement material, the fiber reinforcement material being at least one of carbon fiber, glass fiber, ceramic fiber and aramid fiber.
Specifically, the functional shell has certain strength requirements in the use process, and the components of the functional shell are doped with the limiting reinforcing material, so that the strength of the organic aerogel substrate 122 can be improved, the mechanical properties such as the impact resistance of the functional shell are improved, the parts in the shell 10 of the sound generating device can be better protected, and the service life of the shell 10 is prolonged. The fiber reinforcement material may be one of carbon fiber, glass fiber, ceramic fiber and aramid fiber, or a combination of several of them, which is not limited in the present invention.
Optionally, the rear chamber housing 12 is entirely composed of the functional housing.
In practical applications, the rear housing 12 of the sound generating device may be entirely configured as a functional housing, or only a portion of the rear housing may be configured as a functional housing, and another portion may be configured as a conventional housing, for example, a housing made of PC. For example, in one embodiment, the back cavity housing 12 is further formed with a main body portion that is integrally injection molded or adhesively bonded with the functional housing to form the back cavity housing 12 of the overall sound generating device. In another embodiment, based on the requirement of the sound generating device for being light, thin and small, and the requirement of the sound generating device for generating sound is high, the rear cavity shell 12 can be designed as a functional shell, and the requirement is satisfied by increasing the resonance space of the acoustic rear cavity of the sound generating device virtually.
Optionally, a part of the outer shell 10 corresponding to the front acoustic cavity 111 is a front cavity shell 11, and the front cavity shell 11 is inserted into or assembled with the rear cavity shell 12 in an adhering manner; the main body part and the front cavity shell 11 are respectively made of one of PC and its modified material, PA and its modified material, PPS and its modified material, PP and its modified material, ABS and its modified material, LCP and its modified material, PEI and its modified material, phenolic resin and its modified material, epoxy resin and its modified material, unsaturated polyester and its modified material, stainless steel, aluminum alloy, magnesium alloy, and metal matrix composite material, or may be made of a combination of several of them, specifically selected according to the actual requirements of the sound-generating device for each part of the housing 10, which is not limited in this invention.
The invention also provides a sound generating device, which comprises the shell 10 of the sound generating device in any embodiment, and the sound generating device also comprises a sound generating monomer 20 arranged in the shell 10, and the sound generating monomer performs electroacoustic conversion to realize the sound generating performance of the sound generating device. Wherein, at least a part of the back chamber casing 1212 of shell 10 adopts above-mentioned function casing to make, can improve sound generating mechanism's acoustic performance, or can satisfy sound generating mechanism frivolous, miniaturized design demand, improved the suitability of sound generating mechanism in various electronic equipment, in addition, zeolite filler 124 improves the material as the acoustics, can also further strengthen the structural strength of organic aerogel, improves the stability of sound generating mechanism structure.
The invention also provides electronic equipment which comprises the sound generating device according to the embodiment of the invention. The electronic device may be a mobile phone, a notebook computer, a tablet computer, a VR (virtual reality) device, an AR (augmented reality) device, a TWS (true wireless bluetooth) headset, a smart speaker, or the like, which is not limited in this respect. The electronic product provided by the invention can improve the structural reliability and the acoustic performance of the sound generating device by adopting the sound generating device. On the one hand, the sound generating device is not easy to damage under the conditions of falling, collision and the like of the electronic product. On the other hand, the electronic product can show better acoustic performance on the premise of ensuring the appearance.
In order to make the technical scheme and the corresponding technical effect of the present invention more clear, the present invention specifically provides the following examples and comparative examples to specifically illustrate the technical scheme.
Example 1:
in this embodiment, the sound generating device is assembled by a housing 10 and a sound generating unit 20, referring to fig. 1, wherein the housing 10 is prepared by using a functional casing containing an organic aerogel substrate 122 and a zeolite filler 124, the organic aerogel substrate 122 is a polyimide aerogel, the zeolite filler 124 is a ZSM-5 molecular sieve having a particle size range of 0.5 μm to 30 μm, and the specific preparation process is as follows:
the first step is as follows: 50g of the polyamic acid salt prepared in example 1 and 15g of a ZSM-5 molecular sieve were uniformly dispersed in water to prepare a polyamic acid salt hydrogel having a mass fraction (solid content) of 15%, wherein the ZSM-5 molecular sieve was used as the zeolite filler 124, and had a microporous structure and a mesoporous structure, which had an acoustic improvement effect.
The second step is that: 0.7mg of polyamic acid salt hydrogel is taken and placed between an upper die and a lower die of the shell 10, then the dies are placed on a hot-pressing forming machine, and the polyamic acid salt hydrogel is taken out after hot-pressing forming at the temperature of 60 ℃, and the step is mainly to form the polyamic acid salt hydrogel into the shell 10 of the sounding device.
The third step: and (2) placing the product after the hot-press molding at-50 ℃ for atmosphere freeze drying to prepare polyamic acid salt aerogel, and then carrying out temperature programming (180 ℃/1h and 350 ℃/4 h) on the obtained polyamic acid salt aerogel so as to form staggered porous network structures in the polyamic acid salt aerogel, wherein the ZSM-5 molecular sieve is embedded in the porous network structures, thus obtaining the polyimide aerogel shell 10 containing the ZSM-5 molecular sieve.
Example 2:
in this embodiment, the sound generating device is assembled by the housing 10 and the sound generating unit 20, referring to fig. 1, wherein the housing 10 is prepared by using a functional casing containing an organic aerogel substrate 122 and a zeolite filler 124, the organic aerogel substrate 122 is a polyimide aerogel, the zeolite filler 124 is mordenite particles with a particle size range of 0.5 μm to 5 μm, and the external dimension of the mordenite particle is completely consistent with the external dimension of the polyimide aerogel housing 10 containing the ZSM-5 molecular sieve obtained in embodiment 1, and the specific preparation process is as follows:
the first step is as follows: 50g of the polyamic acid salt prepared in example 1 was uniformly dispersed in water together with 15g of mordenite, which had an acoustic improving effect on the housing 10 as the zeolite filler 124, to prepare a polyamic acid salt hydrogel having a mass fraction (solid content) of 15%.
The second step: taking 0.7mg of polyamic acid salt hydrogel, placing the polyamic acid salt hydrogel between an upper mold and a lower mold of the shell 10, then placing the molds on a hot-press forming machine, taking out the polyamic acid salt hydrogel after hot-press forming at the temperature of 60 ℃, and mainly forming the polyamic acid salt hydrogel into the shell 10 of the sound production device.
The third step: placing the product after the hot press molding at-50 ℃ for atmosphere freeze drying to prepare polyamic acid salt aerogel, then carrying out temperature programming (180 ℃/1h,350 ℃/4 h) on the obtained polyamic acid salt aerogel to enable the interior of the polyamic acid salt aerogel to form staggered porous network structures, and embedding mordenite particles into the porous network structures to obtain the polyimide aerogel shell 10 containing the mordenite.
Example 3:
in the present embodiment, the sound generating apparatus is assembled by a housing 10 and a sound generating unit 20, and referring to fig. 1, the housing 10 is prepared by a functional shell containing an organic aerogel base material 122 and a zeolite filler 124, and a fiber reinforcement material is added to the organic aerogel base material 122.
Wherein, the organic aerogel substrate 122 adopts polyimide aerogel, the zeolite filler 124 adopts ZSM-5 molecular sieve with the grain diameter range of 0.5-30 μm, and the fiber reinforcement material adopts carbon fiber. The overall dimension of the polyimide aerogel shell 10 containing the ZSM-5 molecular sieve obtained in example 1 is completely the same as the overall dimension of the polyimide aerogel shell 10, and the specific preparation process is as follows:
the first step is as follows: 50g of the polyamic acid salt prepared in example 1, 15g of the ZSM-5 molecular sieve and 15g of the carbon fiber were uniformly dispersed in water to prepare a polyamic acid salt hydrogel having a mass fraction (solid content) of 15%, wherein the ZSM-5 molecular sieve was used as the zeolite filler 124, which has a microporous structure and a mesoporous structure, and has an acoustic improvement effect.
The second step is that: taking 0.7mg of polyamic acid salt hydrogel, placing the polyamic acid salt hydrogel between an upper mold and a lower mold of the shell 10, then placing the molds on a hot-press forming machine, taking out the polyamic acid salt hydrogel after hot-press forming at the temperature of 60 ℃, and mainly forming the polyamic acid salt hydrogel into the shell 10 of the sound production device.
The third step: and (2) placing the product subjected to the hot press molding at-50 ℃ for atmosphere freeze drying to prepare polyamic acid salt aerogel, performing temperature programming (180 ℃/1h and 350 ℃/4 h) on the obtained polyamic acid salt aerogel to enable the interior of the polyamic acid salt aerogel to form staggered porous network structures, and embedding the ZSM-5 molecular sieve into the porous network structures to obtain the polyimide aerogel shell 10 containing the ZSM-5 molecular sieve and carbon fibers.
Comparative example 1:
in this comparative example, the sound generating device is assembled by the housing 10 and the sound generating unit 20, referring to fig. 1, wherein the housing 10 is prepared by using the organic aerogel-containing substrate 122, the organic aerogel-containing substrate 122 is polyimide aerogel, the external dimension of the polyimide aerogel-containing substrate is completely the same as the external dimension of the polyimide organic aerogel housing 10 containing the ZSM-5 molecular sieve obtained in example 1, and the specific preparation process of the housing 10 is as follows:
the first step is as follows: 97.3g (0.9 mol) of p-phenylenediamine was dissolved in 1L of N-methylpyrrolidone, 294g (1 mol) of 3,3', 4' -biphenyltetracarboxylic dianhydride was added in small amounts and in a large number of portions under stirring, and polymerization was carried out in an ice-water bath for about 5 hours, followed by addition of 8g (0.02 mol) of 1,3, 5-tris (aminophenoxy) benzene as a crosslinking agent to prepare an amic acid salt solution.
The second step is that: slowly pouring the polyamic acid salt solution into acetone, precipitating to obtain precipitated filaments, namely polyamic acid salt, and drying to constant weight.
The third step: 50g of polyamic acid salt was uniformly dispersed in water to prepare a polyamic acid salt hydrogel having a mass fraction (solid content) of 15%.
The fourth step: 0.7mg of polyamic acid salt hydrogel is placed between an upper die and a lower die of the shell 10, then the dies are placed on a hot-press forming machine, and the polyamic acid salt hydrogel is taken out after hot-press forming at the temperature of 60 ℃, and the step is mainly to form the polyamic acid salt hydrogel into the shape of the shell 10 of the sound production device.
The fifth step: and (3) placing the product subjected to the hot press molding at-50 ℃ for atmosphere freeze drying to prepare polyamic acid salt aerogel, and then carrying out temperature programming (180 ℃/1h,350 ℃/4 h) on the obtained polyamic acid salt aerogel to obtain the pure polyimide aerogel shell 10.
The modulus of the outer shells 10 obtained in the above examples and comparative examples was measured, respectively, wherein:
the modulus of the pure polyimide aerogel shell 10 obtained in comparative example 1 was 200MPa;
the modulus of the polyimide aerogel shell 10 containing the ZSM-5 molecular sieve obtained in example 1 was 3600MPa, which is 1700% higher than that of the pure polyimide aerogel shell 10 obtained in comparative example 1;
the mordenite-containing polyimide aerogel shell 10 obtained in example 2 had a modulus of 3800MPa, which was increased by 1800% compared to the modulus of the pure polyimide aerogel shell 10 obtained in comparative example 1;
the modulus of the polyimide aerogel shell 10 containing the ZSM-5 molecular sieve and the carbon fiber obtained in example 3 was 5000MPa, which was increased by 2400% compared to the modulus of the pure polyimide aerogel shell 10 obtained in comparative example 1.
Therefore, according to the present invention, the zeolite filler 124 (for example, the ZSM-5 molecular sieve filled in example 1 or the mordenite filled in example 2) is filled in the organic aerogel matrix, so that the modulus of the housing 10 can be adjusted within a limited range, that is, between 0.8GPa and 20GPa, the structural strength of the organic aerogel is reinforced, and the structural stability of the housing 10 is improved.
Further, a fiber reinforcement material (e.g., the carbon fibers added in example 3) may be added to organic aerogel substrate 122 to further increase the modulus of outer shell 10. In practical applications, since the ratio of the zeolite filler 124 in the housing 10 has a significant effect on the sound absorption effect of the housing 10, in order to achieve both the sound absorption effect and the structural stability, the auxiliary adjustment may be performed by using a fiber reinforced material to achieve both the superior acoustic effect and the structural strength.
Comparative example 2:
in this comparative example, the sound generating device is assembled by the housing 10 and the sound generating unit 20, and referring to fig. 1, the housing 10 is a PC housing 10 made of PC material, and the shape and size of the PC housing 10 are completely the same as the external dimensions of the polyimide aerogel housing 10 containing the ZSM-5 molecular sieve obtained in example 1, and the specific preparation process is omitted.
The polyimide aerogel shell 10 containing the ZSM-5 molecular sieve obtained in example 1 and the PC shell 10 obtained in the comparative example were assembled with the sounding unit 20 to obtain different sounding devices, and each sounding device was subjected to an acoustic test to obtain an IMP (impedance test) graph as shown in fig. 3 and an FR (frequency loudness) graph as shown in fig. 4.
As shown in fig. 3, in the IMP graph, the abscissa represents the frequency (Hz) of the sound vibration, and the ordinate represents the impedance value of the sound, and the frequency when the impedance value has the first peak, i.e., the resonance frequency F of the sound generating apparatus 0 . As can be seen from FIG. 3, the resonance frequency F of the sound generating device of the polyimide aerogel shell 10 containing ZSM-5 molecular sieve provided in example 2 0 Is 800Hz, is reduced by 100Hz, effectively reducing F compared to the resonance frequency of 900Hz for the sound generating device of the PC housing 10 provided by the comparative example 0 Therefore, the bass sound effect of the sound production device is better.
As shown in fig. 4, in the FR graph, the abscissa represents the frequency (Hz) of sound vibration and the ordinate represents the loudness (dB) of sound, and it can be seen from fig. 4 that the loudness of the sound generating device of the polyimide aerogel casing 10 containing the ZSM-5 molecular sieve provided in example 1 is greater than that of the sound generating device of the PC casing 10 provided in comparative example 2 at the same frequency at a portion lower than 1000Hz, i.e., the bass of the sound generating device is louder and the sound quality is better.
As can be seen from the above embodiments and comparative examples, when the housing 10 of the sound generating device provided by the present invention is applied to a sound generating device, the resonance frequency of the sound generating device can be effectively reduced, the loudness of the sound generating device can be effectively improved, and the acoustic performance of the sound generating device is better.
It should be noted that the above embodiments are based on the innovative inventive concept of "preparing an acoustic device using an organic aerogel". In the case where the above-cited comparative examples relate to organic aerogels, it does not mean that "preparing an acoustic device using an organic aerogel" belongs to the conventional technical means and the prior art. Such comparative examples are for better showing that the embodiments of the present invention have optimized performance effects, so as to characterize the advancement of the technical solution of the present invention.
In the above embodiments, the differences between the embodiments are described in emphasis, and different optimization features between the embodiments can be combined to form a better embodiment as long as the differences are not contradictory, and further description is omitted here in consideration of brevity of the text.
Although some specific embodiments of the present invention have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications can 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 (14)
1. The shell of the sound production device is characterized in that a front sound cavity and a rear sound cavity are arranged in the shell, the part of the shell corresponding to the rear sound cavity is formed into a rear cavity shell, at least one part of the rear cavity shell is formed into a functional shell, and the functional shell comprises an organic aerogel base material and zeolite filler distributed in the organic aerogel base material;
the organic aerogel substrate has a porous structure, the zeolite filler is filled in the porous structure, the particle size of the zeolite filler is 0.1-30 μm, and the modulus of the functional shell is 0.8-20 GPa.
2. The casing of the sound generating apparatus as claimed in claim 1, wherein the zeolite filler has a particle size of 0.5 μm to 3 μm.
3. The cover for a sound emitting device according to claim 1, wherein said zeolite filler has a crystal structure of at least one of FER, MFI, MOR, CHA, IHW, UTL, ITE, MTW, VET.
4. The housing of a sound emitting device of claim 1, wherein the zeolite filler has a mass ratio of silicon to aluminum of greater than or equal to 50.
5. The sound generating apparatus as claimed in claim 1, wherein said zeolite filler has a density of 1.9g/cm 3 ～2.3g/cm 3 。
6. The sound generating apparatus housing as claimed in claim 1, wherein the zeolite filler is spherical, spheroidal, rod-like, square or irregular in shape.
7. The sound generating apparatus casing according to claim 1, wherein the zeolite filler accounts for 10% to 50% by mass of the total mass of the functional housing.
8. The housing of a sound emitting apparatus according to claim 1, wherein the organic aerogel material in the organic aerogel substrate is at least one of imide, polyamide, polyester, aldehyde, polyolefin, polysaccharide and silicone.
9. The sound generating apparatus housing as claimed in claim 1, wherein the functional casing further comprises a fiber reinforcement material, the fiber reinforcement material being at least one of carbon fiber, glass fiber, ceramic fiber and aramid fiber.
10. The enclosure of a sound generator of claim 1, wherein the back volume housing is entirely comprised of the functional housing.
11. The casing of sound generating device according to claim 1, wherein the rear cavity casing is further formed with a main body portion, and the main body portion and the functional casing are integrally injection-molded or adhesively connected.
12. The casing of the sound generating device according to claim 11, wherein the part of the casing corresponding to the front sound cavity is a front cavity casing, and the front cavity casing is inserted into or assembled with the rear cavity casing in an adhering manner;
the main body part and the front cavity shell are respectively prepared from at least one of PC (polycarbonate) and modified materials thereof, PA (polyamide) and modified materials thereof, PPS (polyphenylene sulfide) and modified materials thereof, PP and modified materials thereof, ABS (acrylonitrile butadiene styrene) and modified materials thereof, LCP (liquid Crystal Polymer) and modified materials thereof, PEI (polyetherimide) and modified materials thereof, phenolic resin and modified materials thereof, epoxy resin and modified materials thereof, unsaturated polyester and modified materials thereof, stainless steel, aluminum alloy, magnesium alloy and metal matrix composite materials.
13. A sound generating device, comprising: a casing for a sound emitting device according to any one of claims 1 to 12.
14. An electronic device characterized by comprising the sound emitting apparatus of claim 13.
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