CN115209257B - Casing of sound generating device, sound generating device and electronic equipment - Google Patents
Casing of sound generating device, sound generating device and electronic equipment Download PDFInfo
- Publication number
- CN115209257B CN115209257B CN202211112649.3A CN202211112649A CN115209257B CN 115209257 B CN115209257 B CN 115209257B CN 202211112649 A CN202211112649 A CN 202211112649A CN 115209257 B CN115209257 B CN 115209257B
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- housing
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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
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
- G10K11/168—Plural layers of different materials, e.g. sandwiches
-
- 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
- H04R1/2811—Enclosures comprising vibrating or resonating arrangements for loudspeaker transducers
-
- 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)
- Multimedia (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention discloses a shell of a sound generating device, the sound generating device and an electronic device, wherein at least one part of the shell of the sound generating device is a micropore foaming shell, the raw material of the micropore foaming shell comprises an engineering plastic material, the micropore foaming shell comprises a skin layer, a first foaming layer and a second foaming layer which are sequentially arranged, the first foaming layer and the second foaming layer are of foaming structures, and the pore diameter of no pore channel in the skin layer or the pore channel in the skin layer is less than 0.5 mu m; the first foaming layer is provided with first foam holes, and the pore diameter of the first foam holes is between 0.0005 and 0.5 microns; the second foaming layer is provided with second foam holes, the second foam holes are through holes, at least one part of the second foam holes are communicated with the first foam holes, the pore diameter of the second foam holes is 0.5-50 mu m, and the pore diameter of at least one part of the second foam holes communicated with the first foam holes is larger than that of the first foam holes. The shell can meet the requirements of light weight, reliability and sound absorption, can achieve the effect of providing a virtual sound cavity when being used for a rear sound cavity, and improves the acoustic performance.
Description
Technical Field
The present invention relates to the field of electroacoustic technology, and more particularly, to a housing of a sound generating device, a sound generating device using the housing, and an electronic device using the sound generating device.
Background
With the development of the electroacoustic technology field, electroacoustic devices are gradually developing towards the direction of lightness, thinness, intellectualization, high power and high frequency.
The traditional loudspeaker shell is generally of a single-layer structure formed by common injection molding of a PC (polycarbonate) material, but the loudspeaker shell has the defect of high density, so that the overall weight of an electronic product is too large, and the use experience of consumers is influenced.
In addition, the loudspeaker shell prepared from the PC material cannot meet the requirement for reducing the resonant frequency F0 of the loudspeaker module, and cannot improve the low-frequency loudness of the loudspeaker module.
Therefore, a new technical solution is needed to satisfy the requirements of light weight of the housing, reduction of F0 of the speaker module, and improvement of low frequency loudness of the speaker module.
Disclosure of Invention
The invention aims to provide a shell of a sound generating device, which can solve the problems of high resonant frequency F0 and low-frequency loudness of a loudspeaker module in the prior art.
The invention further aims to provide a sound generating device consisting of the shell and the sound generating unit.
It is still another object of the present invention to provide an electronic device including the above sound emitting apparatus.
In order to achieve the above object, the present invention provides the following technical solutions.
According to the shell of the sound generating device in the embodiment of the first aspect of the present invention, at least a portion of the shell is a microcellular foam shell, the raw material of the microcellular foam shell includes an engineering plastic material, the microcellular foam shell includes a skin layer, a first foam layer and a second foam layer which are sequentially stacked from outside to inside, the first foam layer and the second foam layer are both of a foam structure, wherein no pore channel in the skin layer or the pore channel in the skin layer has a pore diameter of less than 0.5 μm; the first foaming layer is provided with first foam holes, and the pore diameter of the first foam holes is between 0.0005 and 0.5 microns; the second foaming layer is provided with second foam holes, the second foam holes are through holes, at least one part of the second foam holes are communicated with the first foam holes, the pore diameter of the second foam holes is between 0.5 and 50 microns, and the pore diameter of at least one part of the second foam holes communicated with the first foam holes is larger than that of the first foam holes.
According to some embodiments of the invention, the pore size of at least one of the second cells and the first cells gradually decreases in a direction from the second foamed layer toward the first foamed layer.
According to some embodiments of the invention, the first foamed layer is integrally foamed with the second foamed layer.
According to some embodiments of the invention, the cells in the skin layer are distributed at a density greater than 0 cells/cm 3 And is less than or equal to 10 3 Per cm 3 。
According to some embodiments of the invention, the first cells in the first foam layer have a distribution density of 10 10 Per cm 3 ～10 15 Per cm 3 The distribution density of the second cells in the second foam layer is 10 9 Per cm 3 ～10 12 Per cm 3 。
According to some embodiments of the invention, the engineering plastic material comprises at least one of poly 4 methyl-1-pentene, polypropylene, syndiotactic polystyrene, PA66, PA6, PA68, PA610, PA612, PA9, PA1010, PA1012, PA11, PA12, PA1212, PA1313, polycarbonate, polyoxymethylene, polyphenylene oxide, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyphenylene sulfide, polyarylate, polyetheretherketone, liquid crystal polymer.
According to some embodiments of the invention, the feedstock further comprises a reinforcing agent comprising at least one of glass fibers, carbon fibers, basalt fibers, and polymer fibers.
According to some embodiments of the invention, the reinforcing agent is present in an amount of 10wt% to 40wt% based on the total weight of the feedstock.
According to some embodiments of the invention, the feedstock further comprises a nanofiller comprising at least one of silica, carbon black, clay, carbon nanotubes, calcium carbonate, cellulose, montmorillonite, alumina, graphene oxide, talc, mica powder, kaolin, wollastonite, diatomaceous earth, titanium dioxide.
According to some embodiments of the invention, the microcellular foamed casing has a density of 0.9g/cm 3 ～1.3g/cm 3 。
According to some embodiments of the invention, the microcellular foamed casing has a flexural modulus of 3.5GPa or more.
According to some embodiments of the invention, the microcellular foamed housing has a heat distortion temperature of 130 ℃ or more.
According to some embodiments of the invention, a front sound cavity and a rear sound cavity are defined in the shell of the sound generating device, a part of the shell corresponding to the rear sound cavity is formed into a rear cavity shell, and at least one part of the rear cavity shell is the microcellular foam shell.
According to some embodiments of the invention, the shell comprises a first sub-shell and a second sub-shell, the first sub-shell being bonded or integrally injection molded with the second sub-shell, the first sub-shell being formed as the microcellular foamed shell, the second sub-shell being manufactured by at least one of steel, aluminum alloy, copper alloy, titanium alloy, PP and modified material thereof, PA and modified material thereof, PET and modified material thereof, PBT and modified material thereof, PPs and modified material thereof, PEI and modified material thereof, PEEK and modified material thereof, PEN and modified material thereof, PPA and modified material thereof, PC and modified material thereof, SPS and modified material thereof, TPX and modified material thereof, POM and modified material thereof, and LCP and modified material thereof.
A sound emitting device according to an embodiment of the second aspect of the present invention includes the housing of any one of the sound emitting devices described above.
An electronic device according to a third aspect of the present invention includes the sound emitting apparatus according to the above embodiments.
According to the shell of the sound generating device provided by the embodiment of the invention, at least one part of the shell is a micro-porous foaming shell, and the micro-porous foaming shell has a three-layer structure, wherein the surface layer is compact in structure, so that liquid, gas and dust can be effectively prevented from passing through the shell, and the requirements of the shell on water resistance, air permeability prevention and dust prevention are met. And when first foaming layer and second foaming layer correspond with micropore foaming casing for foaming structure and back sound chamber, in the sound production monomer vibration process among the sound generating mechanism, sound wave accessible second bubble gets into first bubble downtheholely, can increase the volume in back sound chamber through first bubble, has realized providing the effect in virtual sound chamber to reduce sound generating mechanism's F0, promote sound generating mechanism's low frequency loudness. In addition, the first foaming layer and the second foaming layer are provided with a plurality of tiny holes, and the density of the tiny holes is smaller than that of a compact structure made of the same material, so that the shell of the sound generating device provided by the embodiment of the invention can meet the reliability requirement and achieve the purpose of light weight. The shell of the sound generating device has multiple functions, can realize the fixing and sealing functions, can provide a virtual sound cavity when being applied to the rear sound cavity, and can play the roles of sound absorption, water resistance, air permeability prevention and the like.
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 view of a sound emitting device according to an embodiment of the present invention;
FIG. 2 is a partial schematic view in cross-section of a microcellular foam shell according to an embodiment of the present invention;
FIG. 3 is a graph comparing the frequency response curves of example 1 provided by the example of the present invention and the comparative example;
fig. 4 is a frequency response graph of examples 1 to 6 provided in the embodiment of the present invention.
Reference numerals
A sound generating device 100;
a housing 10; an upper case 11; a skin layer 111; a first foamed layer 112; a second foamed layer 113; a lower case 12;
the sounding unit 20.
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, it need not be discussed further in subsequent figures.
First, the housing 10 of the sound generating device 100 according to the embodiment of the present invention is specifically described, wherein the sound generating device 100 may be a speaker module.
As shown in fig. 1 and fig. 2, at least a portion of the casing 10 of the sound generating device 100 according to the embodiment of the present invention is a microcellular foam casing, a raw material of the microcellular foam casing includes an engineering plastic material, the microcellular foam casing includes a skin layer 111, a first foam layer 112, and a second foam layer 113, which are sequentially stacked from outside to inside, and both the first foam layer 112 and the second foam layer 113 are of a foam structure.
Specifically, no pore in skin layer 111 or pore in skin layer 111 has pore diameter less than 0.5 μm, first foam layer 112 has first cells, the pore diameter of the first cells is between 0.0005 μm and 0.5 μm, second foam layer 113 has second cells, the second cells are through holes, at least a part of the second cells are communicated with the first cells, the pore diameter of the second cells is between 0.5 μm and 50 μm, and the pore diameter of at least a part of the second cells communicated with the first cells is larger than the pore diameter of the first cells.
In other words, at least a portion of the housing 10 of the sound generating device 100 of the present invention is constituted by a microcellular foamed housing, which may be made of raw materials including engineering plastic materials. The engineering plastic material has excellent comprehensive performance, for example, the engineering plastic material has the advantages of high rigidity, high mechanical strength, good heat resistance, good electrical insulation and the like, so that the microporous foamed shell prepared from the engineering plastic material can be used in harsh chemical and physical environments for a long time. When the microcellular foam shell is processed and prepared, engineering plastic materials in the form of matrix resin can be adopted, so that the charging and processing are convenient.
The microcellular foam shell has a three-layer structure, the three-layer structure is respectively a skin layer 111, a first foam layer 112 and a second foam layer 113, the skin layer 111, the first foam layer 112 and the second foam layer 113 are sequentially laminated from outside to inside, and the first foam layer 112 is sandwiched between the skin layer 111 and the second foam layer 113. That is, the first foam layer 112 is located in the middle of the three-layer structure, the skin layer 111 is located on the first side of the first foam layer 112, and the second foam layer 113 is located on the second side of the first foam layer 112. When the microcellular foam casing is at least a part of the casing 10 of the sound generating apparatus 100, a sound cavity is formed inside the casing 10 of the sound generating apparatus 100, and a direction close to the sound cavity may be defined as an inner side and a direction close to an external environment may be defined as an outer side. The sound cavity may be divided into a front sound cavity and a rear sound cavity by the sound generating unit 20, and at least one of the front sound cavity and the rear sound cavity may correspond to the microcellular foamed housing. In this case, the skin layer 111, the first foam layer 112, and the second foam layer 113 are sequentially stacked from outside to inside, that is, the second foam layer 113 may be disposed on the side of the first foam layer 112 close to the acoustic cavity, and the skin layer 111 may be disposed on the side of the first foam layer 112 close to the outside.
Alternatively, the skin layer 111 has no holes, that is, the skin layer 111 may be a compact structure without holes, so as to prevent liquid, dust and gas from passing through, so that the liquid, dust and gas cannot pass through the skin layer 111 of the microcellular foam housing, thereby playing a role in preventing water, dust and gas from passing through, and further protecting the structure housed in the housing 10, for example, protecting the sound-emitting units 20 in the housing 10.
Alternatively, the skin layer 111 may have pores therein, but the pore diameter of the pores is less than 0.5 μm, and since the pore diameter is small enough and the number of pores is small, liquid, dust and gas cannot enter the casing 10 through the pores, and therefore, the skin layer can also play a role in preventing water, dust and gas from penetrating, thereby protecting the structure contained in the casing 10, such as the sound generating unit 20 in the casing 10.
It is understood that whether the skin layer 111 has the holes or not, the skin layer 111 is formed into a compact structure, and has the functions of water resistance, air permeability resistance and force bearing.
In addition, each of the first foamed layer 112 and the second foamed layer 113 has a microcellular foamed structure, wherein the foamed structure is a structure having cells in which gas is present in the form of cells. For ease of illustration, the cells within first foamed layer 112 are defined as first cells and the cells within second foamed layer 113 are defined as second cells. And at least one part of the second foam holes are through holes, the through holes can be communicated with at least one first foam hole, and air in the sound cavity can pass through the second foam layer to enter the first foam layer through the through holes so as to transmit sound waves to the interior of the first foam hole. It should be noted that the second cells and the first cells are not limited to have a one-to-one correspondence.
For example, the first foam layer 112 may be a closed-cell foam structure or an open-cell foam structure, and if the first foam layer 112 is a closed-cell foam structure, the first foam layer 112 has an independent cell structure, and the first cells are separated from the first cells by a wall membrane and are not connected to each other. The closed-cell foam material has the advantages of excellent impact resistance, rebound resilience, flexibility, water resistance, air permeability resistance and the like, and the shell 10 adopting the closed-cell foam structure also has the advantages. If first foaming layer 112 is trompil foam structure, communicate each other between first cell and the first cell, for non-independent cell structure, have advantages such as matter is light, specific strength is high, can absorb impact load, thermal-insulated and sound-proof properties, adopt shell 10 of trompil foam structure to also have above-mentioned advantage. It should be noted that whether the first foam layer 112 is a closed cell foam structure or an open cell foam structure, at least a portion of the plurality of first cells can communicate with at least a portion of the second cells, and the airflow within the acoustic cavity can pass through the second cells into the first cells that communicate with the second cells.
Wherein the pore diameter of the first cells is between 0.0005 and 0.5 mu m, and the pore diameter of the second cells is between 0.5 and 50 mu m. That is, comparing the pore size of the first cells with the pore size of the second cells in size, the pore size of the first cells is relatively small, the pore size of the second cells is relatively large, and the pore size of the portion of the second cells in communication with the first cells may be the same. The second foam hole with larger pore diameter is beneficial to ensure that more air enters the first foam hole after passing through the second foam hole.
That is, the relationship between the first and second cells includes, but is not limited to, the following two: one end of the second foam hole is communicated with the sound cavity, the other end of the second foam hole is communicated with one end of the first foam hole, a pore canal of the second foam hole can extend from one side, close to the sound cavity, of the second foam layer to be communicated with the first foam hole along the direction of the central axis of the second foam hole, at the moment, along the extending direction of the central axis of the second foam hole, the pore diameter of each position of the second foam hole can be larger than that of the first foam hole, and a step is arranged at the connecting position between the second foam hole and the first foam hole; and in the second situation, one end of the second bubble is communicated with the sound cavity, the other end of the second bubble is communicated with one end of the first bubble, and at the moment, along the extending direction of the central axis of the second bubble, the pore diameter of the other end of the second bubble is the same as that of one end of the first bubble, namely, the connection between the second bubble and the first bubble is smooth and has a buffer area.
In either case, it will be understood that the vibration of the sound generating unit 20 in the housing 10 of the sound generating device 100 can cause the vibration of the adjacent air to form sound waves, and the sound waves propagate around in the air medium. When the sound wave enters the interior of the first foam hole through the second foam hole, the reflection capacity of the sound wave can be reduced through the first foam hole, and the sound absorption effect is achieved. At this time, the pore diameter of the second pore is larger, so that more sound waves can enter the first pore, and the guiding function is achieved. The aperture of first cell is less, and when first cell and back sound chamber communicate, first cell can play the effect of the virtual volume of increase back sound chamber, provides the effect in virtual sound chamber promptly, and first cell can promote the low frequency effect from this to still have the sound effect of inhaling. When first cell and preceding sound cavity intercommunication, through adopting the reflection of sound wave in the sound cavity before first cell can reduce to can effectively get rid of the standing wave, promote sound generating mechanism 100's sound producing effect.
It should be noted that the cross section of the first and second cells may be circular or non-circular, and is not limited herein. The pore size is illustrated by way of example for the first cell. When the cross section of the first cell is a perfect circle, the pore size may be a diameter, and when the cross section of the first cell is a non-circle, the pore size may be a distance between any two points that are farthest apart in any direction within the cross section of the first cell, for example, when the first cell is an ellipse, the pore size is a length of a major axis and a minor axis on the cross section.
In addition, the first cells have a pore size in the range of 0.0005 μm to 0.5 μm, inclusive of 0.0005 μm and 0.5. Mu.m. It should be noted that if the pore diameter of the first cell is smaller than 0.0005 μm, the density of the first foam layer will be too high, so that the weight of the microcellular foam housing is increased, and further the housing 10 of the sound generating device 100 is heavy, and it is difficult to achieve the effect of light weight. If the pore diameter of the first cells is larger than 0.5 μm, it will result in poor sound absorption of the casing 10. By controlling the aperture range of the first bubble to be 0.0005-0.5 μm, the density of the shell 10 can be reduced, the requirement of light weight can be met, and the first bubble can be ensured to contain sound waves, so that the shell 10 has better acoustic performance, and the sound absorption effect of the shell 10 is ensured. Alternatively, the first cells have a cell diameter of 0.0005 μm, 0.0008 μm, 0.001 μm, 0.02 μm, 0.08 μm, 0.1 μm, 0.5 μm, etc., which can satisfy both the light weight and sound absorption effects of the microcellular foamed housing. Also, the above pore size may be an average pore size of the first cells, that is, the pore size of each first cell within the first foamed layer may be different. For example, in some embodiments, the first cells may have a pore size of 0.001 μm to 0.02 μm, in which case, the smallest first cell in the first foam layer may have a pore size of 0.001 μm and the largest first cell may have a pore size of 0.02 μm.
And the pore size of the second cells is between 0.5 μm and 50 μm, inclusive of 0.5 μm and 50 μm. It should be noted that, if the pore diameter of the second pore is smaller than 0.5 μm, it is easy to cause that the sound wave is difficult to enter the first pore through the second pore, and if the pore diameter of the second pore is larger than 50 μm, that is, if the second pore is too large, the structure of the microporous foamed shell is loose, the propagation resistance of the sound wave in the second foamed layer 113 is reduced, so that the medium and low frequency sound wave enters the interior of the microporous foamed shell more easily, thereby reducing the loss of the sound wave in the pore, and being not beneficial to absorbing the loss sound wave. By controlling the aperture of the second bubble to be between 0.5 μm and 50 μm, more air can rapidly enter the first bubble through the second bubble, that is, when the structure for generating sound in the sound generating device 100 vibrates, sound waves can enter the first bubble through the second bubble, thereby ensuring the sound absorption effect of the casing 10. Optionally, the pore diameter of the second pores is 0.5 μm, 1.5 μm, 5 μm, 10 μm, 20 μm or 50 μm, etc., which not only can realize the rapid entry of sound waves into the first pores, but also is beneficial to sound absorption, thereby improving the sound absorption effect of the microcellular foamed housing and providing a virtual sound cavity when the microcellular foamed housing is used in a rear sound cavity. Also, the above pore size may be an average pore size of the second cells, that is, the pore size of each second cell within the second foamed layer may be different. For example, in some embodiments, the second cells may have a pore size of 0.5 μm to 5 μm, in which case the smallest second cells in the second foamed layer may have a pore size of 0.5 μm and the largest second cells may have a pore size of 5 μm.
In addition, the low frequency sensitivity of the sound generating apparatus 100 is easily affected by the volume of the rear sound cavity, and the larger the volume of the rear sound cavity in the sound generating apparatus 100 is, the better the effect of reducing the resonant frequency F0 of the sound generating apparatus 100 is. When at least a part of the back sound cavity is formed by the cooperation of the sound production monomer 20 and the micro-porous foaming shell, the communication between the first foam cell and the back sound cavity can be realized through the second foam cell in the second foaming layer 113 by at least a part of the first foam cell in the first foaming layer 112, therefore, the volume of the back sound cavity in the sound production device 100 can be increased, thereby improving the low-frequency effect and further improving the sound production effect of the sound production device 100.
Therefore, according to the casing 10 of the sound generating device 100 of the embodiment of the present invention, at least a portion of the casing 10 is a microcellular foam casing, and the microcellular foam casing has a three-layer structure, wherein the skin layer 111 has a compact structure, so as to effectively block liquid, gas and dust from passing through, and meet the requirements of the casing 10 for water resistance, air permeability resistance and dust resistance. And, first foaming layer 112 and second foaming layer 113 are when foaming structure and back sound chamber and micropore foaming casing correspond, and in sound production monomer 20 vibration process among sound generating mechanism 100, sound wave accessible second bubble gets into in the first bubble, can increase the volume in back sound chamber through first bubble, has realized providing the effect in virtual sound chamber to reduce sound generating mechanism 100's F0, promote sound generating mechanism 100's low frequency loudness. In addition, since the first foam layer 112 and the second foam layer 113 have a plurality of tiny holes therein, and the density of the holes is smaller than that of a compact structure made of the same material, the casing 10 of the sound generating device 100 according to the embodiment of the present invention can satisfy the reliability requirement and achieve the purpose of light weight. The casing 10 of the sound generating device 100 of the present invention has multiple functions, not only can realize the fixing and sealing functions, but also can provide a virtual sound cavity when being applied to a rear sound cavity, and further can play roles of sound absorption, water resistance, air permeation prevention, etc.
According to one embodiment of the present invention, the pore size of at least one of the second cells and the first cells gradually decreases in a direction from second foamed layer 113 toward first foamed layer 112. For example, in a partial structure of the microcellular foam housing, the partial structure may extend along a horizontal direction, the skin layer 111, the first foam layer 112 and the second foam layer 113 may be stacked from top to bottom, the second foam layer 113 may be located below the first foam layer 112, and the sound cavity of the sound generating apparatus 100 may be located below the second foam layer 113, at this time, if the microcellular foam housing is sequentially cut along the horizontal direction from bottom to top, the pore size of at least one of the second cell and the first cell is gradually reduced.
Specifically, in the direction from second foamed layer 113 to first foamed layer 112, the pore size of at least one of the second cells and the first cells gradually decreases, and may be such that the pore size of the second cells gradually decreases, or may be such that the pore size of the first cells gradually decreases, or may be such that both the pore size of the second cells and the pore size of the first cells gradually decrease. For example, at least one of the second cells and the first cells may be tapered cells, a larger area of the opening in the tapered cells may be oriented in a direction in which second foam layer 113 is away from first foam layer 112, and a smaller area of the opening in the tapered cells may be oriented in a direction in which second foam layer 113 is closer to first foam layer 112.
In the present embodiment, the pore size of at least one of the second cells and the first cells gradually decreases in the direction from second foamed layer 113 toward first foamed layer 112. For example, the pore size of the second pores is gradually reduced, so that the sound waves generated by the sound generating unit 20 of the sound generating device 100 enter the first pores after being reflected for multiple times in the second pores with gradually reduced pore sizes and are absorbed, thereby improving the sound absorbing effect. And when the micropore foaming shell is applied to the rear sound cavity, a virtual sound cavity can be provided through the first foam hole, the resonant frequency F0 of the sound generating device 100 is reduced, and the low-frequency loudness of the sound generating device 100 is improved.
According to one embodiment of the present invention, the first foamed layer 112 is integrally foamed with the second foamed layer 113. In this embodiment, the microcellular foam housing may be prepared from raw materials including engineering plastic materials through a microcellular foam injection molding process, and the microcellular foam housing is an integrally molded part, in this case, the first foam layer 112 and the second foam layer 113 are simultaneously processed and molded, and the first foam layer 112 and the second foam layer 113 are not connected by gluing or the like. The first foaming layer 112 and the second foaming layer 113 are processed and molded in an integral molding manner, so that the production steps of the shell 10 are simplified, the production efficiency of the shell 10 is improved, and the production cost of the shell 10 is reduced.
Optionally, the skin layer 111, the first foam layer 112, and the second foam layer 113 may be integrally formed, that is, the entire microcellular foam casing is an integrally formed part formed by performing microcellular foam injection molding on raw materials, and the skin layer 111, the first foam layer 112, and the second foam layer 113 may be formed by controlling the foaming degrees of different regions, at this time, the skin layer 111, the first foam layer 112, and the second foam layer 113 are not connected with each other by other methods, for example, the connection may be achieved without using glue or the like, so that not only is the structural reliability and the firmness of the microcellular foam casing improved, but also the separation between the skin layer 111, the first foam layer 112, and the second foam layer 113 is avoided, and the complexity of the manufacturing process can be reduced, and the skin layer 111, the first foam layer 112, and the second foam layer 113 connected with each other may be simultaneously formed without additional process steps.
It can be appreciated that the prior art housings formed by bonding a plurality of layers have the disadvantage of being limited in shape, and most often can be formed only in regular shapes, such as rectangular sheets. The microcellular foam housing of the present invention may be an integrally formed part formed by microcellular injection molding, and may be formed in various shapes of structures, whether regular or irregular, such as a linear region on the housing 10 or a curved region on the housing 10. That is, the microcellular foam casing formed by microcellular foam injection molding according to the present invention can form uneven regions such as corners, thereby greatly improving the structural uniformity of each position of the casing 10 of the sound generating apparatus 100, and improving the appearance beauty and functional uniformity of the casing 10 of the sound generating apparatus 100 without additionally bonding other casing structures to the corners, and the like.
Wherein, when the microcellular foam shell is manufactured by the microcellular foam injection molding process, the following specific steps can be adopted: firstly, adding engineering plastic materials into a micro-foaming injection molding machine for melting and plasticizing; then, the plasticized melt is injected into a molding die. The mold temperature near skin layer 111 is low, and the mold temperature near second foam layer 113 is high. After the melt is injected into the mold, the melt temperature of the adjacent low temperature mold decreases rapidly and is difficult to foam, thereby forming a dense structure of the skin layer 111. The melt close to the high-temperature mold has a slow temperature drop, so that the foaming structure of the second foaming layer 113 is easily formed, and the pore diameter of the formed second cells is larger. The melt temperature decrease rate at the intermediate portion is between that of the skin layer 111 and that of the second foamed layer 113, and a foamed structure having small cell diameters is easily formed, thereby forming the first foamed layer 112.
It can be seen that the skin layer 111, the first foam layer 112, and the second foam layer 113 can be integrally formed by using a micro-foaming injection molding process, so that the skin layer 111 and the first foam layer 112 do not need to be connected in an additional connection manner, the production steps of the housing 10 are further simplified, the production efficiency of the housing 10 is improved, and the production cost of the housing 10 is reduced.
According to one embodiment of the present invention, the distribution density of the cells in the skin layer 111 is greater than 0 cells/cm 3 And is less than or equal to 10 3 Per cm 3 . That is, the skin layer 111 has 1 to 1000 pores with a diameter less than 0.5 μm per cubic centimeter. It should be noted that the distribution density of the cells in the skin layer 111 is greater than 10 3 Per cm 3 In this case, the waterproof, air-permeable and waterproof effects of the skin layer 111 are easily affected. When the distribution density of the pores in the skin layer 111 is more than 0/cm 3 And is less than or equal to 10 3 Per cm 3 In this case, the skin layer 111 can be provided with waterproof, air-proof, and air-permeable functions, and the density of the case 10 can be reduced, thereby meeting the demand for weight reduction. Alternatively, the distribution density of the cells in the skin layer 111 is 10 1 Per cm 3 、10 2 Per cm 3 、10 3 Per cm 3 And the like, the light weight, waterproof, and air permeation preventing effects of the case 10 can be simultaneously achieved.
According to one embodiment of the present invention, the first cells within the first foamed layer 112 have a distribution density of 10 10 Per cm 3 ～10 15 Per cm 3 And the distribution density of second cells in second foamed layer 113 is 10 9 Per cm 3 ～10 12 Per cm 3 . That is, the first foamable layer 112 has 10 per cubic centimeter 10 To 10 15 First cells and second foamed layer 113 having a distribution density of 10 per cubic centimeter 9 To 10 12 Second cells of the plurality. It is understood that the second cells may be through holes and the first cells may be either through holes or blind holes. It should be noted that if the distribution density of the first cells in the first foamed layer 112 is less than 10 10 Per cm 3 Poor acoustic performance of the first foam layer 112 is likely to result; if the distribution density of the first cells in the first foamed layer 112 is greater than 10 15 Per cm 3 This tends to result in insufficient strength of the first foamed layer 112. When the distribution density of the first cells in the first foamed layer 112 is 10 10 Per cm 3 ～10 15 Per cm 3 In time, the structural strength and the sound absorption effect of the shell 10 can be considered at the same time, and the acoustics is improvedAnd (4) performance. Alternatively, the first cells in the first foamed layer 112 have a distribution density of 10 10 Per cm 3 、10 11 Per cm 3 、10 12 Per cm 3 、10 13 Per cm 3 、10 14 Per cm 3 、10 15 Per cm 3 Etc., capable of simultaneously realizing acoustic properties and mechanical properties of the casing 10.
And, if the distribution density of second cells in second foamed layer 113 is less than 10 9 Per cm 3 Easily resulting in less acoustic waves being introduced into the first cells through the second cells; if the distribution density of second cells in second foamed layer 113 is more than 10 12 Per cm 3 It is not good for absorbing the loss sound wave. When the distribution density of second cells in second foamed layer 113 is 10 9 Per cm 3 ～10 12 Per cm 3 In the meantime, the structural strength and the air permeation efficiency of the housing 10 can be considered at the same time, so that more air permeates through the second foaming layer 113 and enters the first foaming layer 112, thereby improving the sound absorption effect and the acoustic performance.
Alternatively, second cells in second foamed layer 113 have a distribution density of 10 9 Per cm 3 、10 10 Per cm 3 、10 11 Per cm 3 Or 10 12 Per cm 3 And the like, which can simultaneously facilitate more air to enter the first cells through the second cells, so that the housing 10 has a sound-absorbing effect and improves acoustic performance.
Alternatively, the number of the first cells may be greater than the number of the second cells, and the pore diameters of all the first cells may be smaller than the pore diameter of any one of the second cells, that is, the pore diameters of the first cells are smaller and distributed more densely, and the pore diameters of the second cells are larger and distributed more loosely, so that more air can penetrate through second foam layer 113 into first foam layer 112, and thus the acoustic performance of housing 10 can be further improved.
In this embodiment, through the quantity of injecing first cell and second cell in per cubic centimeter, can be when guaranteeing micropore foaming casing reliability, the lightweight of sound generating mechanism 100 product has been realized, and make more air can get into first cell through the second cell smoothly downtheholely, improve casing 10's acoustic effect, and realized virtual sound cavity structure effect when being applied to back sound cavity, thereby reduced sound generating mechanism 100's F0, the low frequency loudness of sound generating mechanism 100 has been promoted.
According to an embodiment of the present invention, the engineering plastic material includes at least one of poly 4 methyl-1-pentene (TPX), polypropylene (PP), syndiotactic Polystyrene (SPS), PA66, PA6, PA68, PA610, PA612, PA9, PA1010, PA1012, PA11, PA12, PA1212, PA1313, polyphthalamide (PPA), polycarbonate (PC), polyoxymethylene (POM), polyphenylene oxide (PPO), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polyphenylene Sulfide (PPs), polyarylate (PAR), polyether ether ketone (PEEK), liquid Crystal Polymer (LCP), and the like. Because the materials have good temperature resistance, the microcellular foam shell prepared from the materials can meet the high-temperature reliability requirement of the sound generating device 100.
That is, the microcellular foamed housing may be made primarily of one or more of the above materials. Since the above-mentioned materials have excellent overall performance, specifically, the engineering plastic materials have the advantages of high rigidity, high mechanical strength, good heat resistance, good electrical insulation, and the like, and can be used in harsh chemical and physical environments for a long time, the housing 10 of the present embodiment also has excellent overall performance, and can meet the reliability requirement of the sound generating device 100.
According to one embodiment of the invention, the feedstock further comprises a reinforcing agent comprising at least one of glass fibers, carbon fibers, basalt fibers, and polymeric fibers. Alternatively, the polymer fiber may be selected from aramid fiber, polyimide fiber, and the like. After the reinforcing agent and the engineering plastic material are mixed, the obtained microcellular foam shell has the advantages of high modulus, high temperature resistance and the like. And because the microcellular foam shell is light in weight, even if the reinforcing agent is added, the weight of the whole electronic equipment product is not too large, and the use experience of a user is ensured.
Wherein the density of the glass fiber material is generally 2.5g/cm 3 ～2.8g/cm 3 The glass fiber types include alkali-free glass fiber, medium-alkali glass fiber, high-strength glass fiber, alkali-resistant glass fiber, low-dielectric glass fiber and the like, the glass fiber type has the advantage of wide selection range, and the shell 10 prepared from the glass fiber material has high strength.
Optionally, the raw material further includes a silane coupling agent, it should be noted that, due to the excessive difference in surface energy between the glass fiber and the engineering plastic material, the wettability and dispersibility of the glass fiber in the engineering plastic material are poor, so that the glass fiber may be surface-treated to improve the compatibility between the two, for example, the surface of the glass fiber may be treated by the silane coupling agent during the production process. Further, the silane coupling agents used include: methacryloxy silane coupling agent, vinyl silane coupling agent, alkyl silane coupling agent, chloroalkyl silane coupling agent and the like, namely the components of all positions of the shell 10 prepared from silane coupling agent and glass fiber are uniform, and the mechanical property and the acoustic property of the shell 10 are improved.
Furthermore, when carbon fibers are used as the reinforcing fibers, the density of the carbon fiber material is generally 1.5g/cm 3 ～2.0g/cm 3 It can be seen that the carbon fibers are less dense than the glass fibers. In addition, the reinforcing effect of the carbon fiber is better. It should be noted that, because the compatibility between the carbon fiber and the engineering plastic material is poor, optionally, during the production and processing, the carbon fiber is pre-impregnated with a layer of polymer material for surface treatment, so as to improve the compatibility between the carbon fiber and the polyolefin material, and further, the shell 10 prepared from the carbon fiber has a higher strength.
When the reinforcing fiber is basalt fiber, the basalt fiber has the advantage of high modulus, but the surface energy of the basalt fiber is relatively low, and optionally, during production and processing, the surface treatment is performed on the basalt fiber to improve the surface activity of the basalt fiber, so that the shell 10 prepared from the basalt fiber has a relatively high modulus.
When the reinforcing fiber is polymer fiberThe density of the polymer fibers is generally less than 1.5g/cm 3 The common temperature-resistant polymer fibers can be aromatic polyamide fibers and polyimide fibers, and the polymer fibers have excellent temperature resistance and excellent compatibility with engineering plastics, so that the shell 10 prepared from the polymer fibers has the temperature resistance.
In this embodiment, at least one of glass fiber, carbon fiber and polymer fiber is added as a reinforcing agent in the raw material, so that the strength and the high temperature resistance of the microcellular foam shell can be effectively improved, and the microcellular foam shell can meet various actual reliability requirements.
According to one embodiment of the invention, the reinforcing agent is present in an amount of 10wt% to 40wt% based on the total weight of the feedstock, that is, the weight percentage of the reinforcing agent is 10wt% to 40wt%, inclusive. It should be noted that, if the weight percentage of the reinforcing agent is less than 10wt%, the reinforcing effect of the reinforcing agent on the engineering plastic material is easy to be small, the mechanical property of the engineering plastic material is affected, the temperature resistance of the microcellular foamed shell is low, and the damage and failure of the microcellular foamed shell are easy to be caused. If the weight percentage of the reinforcing agent is greater than 40wt%, the density of the reinforcing agent is likely to be higher than that of the engineering plastic material, and in this case, as the weight percentage of the reinforcing agent is higher, the density of the mixed material mixed with the engineering plastic material is higher, and the weight of the resulting microcellular foam casing is also higher, which makes it difficult to achieve the purpose of weight reduction. And as the weight percentage of the reinforcing agent is increased, the melt viscosity of the modified material is increased, the melt index is reduced, and the injection molding of a thin-walled product, namely the injection molding of the shell 10 with a thin thickness is difficult.
When the content of the reinforcing agent accounts for 10wt% -40 wt% of the total weight of the raw materials, the reinforcing effect of the reinforcing agent on the shell 10 can be ensured, the melt index of the material can be ensured to meet the injection molding requirement of the product, and the product can be smoothly molded, that is, the strength and the high temperature resistance of the microcellular foam shell can be effectively improved, so that the microcellular foam shell can meet various actual reliability requirements.
Optionally, the weight percentage of the reinforcing agent is 10wt%, 15wt%, 20wt%, 25wt%, 30wt% or 40wt%, etc., which can improve the mechanical properties and high temperature resistance of the obtained microcellular foamed shell, and also achieve the purpose of light weight, and also facilitate obtaining a microcellular foamed shell with a thinner thickness by injection molding.
According to an embodiment of the present invention, the raw material further comprises a nano filler, and the nano filler comprises at least one of silica, carbon black, clay, carbon nanotubes, calcium carbonate, cellulose, montmorillonite, alumina, graphene oxide, talc, mica powder, kaolin, wollastonite, diatomaceous earth, titanium dioxide, and the like. It should be noted that, in the process of preparing the microcellular foam shell, the nanofiller may induce the gas to form a gas core first, and the gas core may form bubbles, which is finally beneficial to forming the cells in the first foam layer 112 and the second foam layer 113.
According to one embodiment of the invention, the microcellular foamed casing has a density of 0.9g/cm 3 ～1.3g/cm 3 Including an endpoint value of 0.9g/cm 3 And 1.1g/cm 3 . The skin layer 111, the first foam layer 112, and the second foam layer 113 may have different densities, and the density of the microcellular foam shell may be the average density of the microcellular foam shell. It should be noted that if the density of the microcellular foamed casing is less than 1.0g/cm 3 The strength of the microcellular foamed shell is easy to be low; if the density of the microcellular foamed shell is more than 1.3g/cm 3 This would result in a heavier microcellular foam housing and thus an increased weight of the sound generating apparatus 100. The density of the microcellular foam shell is 0.9g/cm 3 ～1.3g/cm 3 In this case, the housing 10 may have both advantages of high strength and low density, that is, not only the light weight of the sound generating device 100 may be satisfied, but also the strength of the sound generating device 100 may be ensured. Optionally, the microcellular foamed casing has a density of 0.9g/cm 3 、1.0g/cm 3 、1.15g/cm 3 、1.20g/cm 3 、1.3g/cm 3 And the like, the sound generating device 100 can be made to have both light weight and high strength.
Furthermore, the density of the single-layer structure of the common injection-molded case of the prior art is 1.35g/cm 3 In this embodiment, the microThe density of the hole foaming shell is smaller, the weight of the shell 10 with the same volume is reduced, and the light weight of the sound generating device 100 is facilitated.
According to one embodiment of the invention, the flexural modulus of the microcellular foamed casing is ≧ 3.5GPa. It should be noted that if the flexural modulus of the microcellular foam casing is less than 3.5GPa, the strength of the microcellular foam casing is likely to be insufficient, and the sound generating apparatus 100 assembled by the microcellular foam casing is likely to generate resonance. Therefore, the flexural modulus of the microcellular foam casing is not less than 3.5GPa, which is beneficial to improving the acoustic performance and mechanical performance of the sound generating apparatus 100.
When the flexural modulus is not less than 3.5GPa, the flexural modulus of the microcellular foam case of the present embodiment can be made to satisfy the flexural modulus requirement of the case 10 of the sound-emitting device 100. The testing principle of the flexural modulus of the microcellular foam shell can refer to GB/T9341-2008, and the specific testing method is as follows: 2mm/min, taking a flat part with uniform thickness on the shell, wherein the width of the sample is 5mm; the diameter of the pressure head is 2mm; when the thickness of the sample is less than 1mm, the test span is 5mm; when the thickness of the sample is between 1mm and 1.5mm, the test span is 6mm; when the thickness of the sample is between 1.5mm and 2mm, the test span is 7mm; 5 splines were tested and averaged.
Alternatively, the flexural modulus of the microcellular foam casing may be 3.5GPa, 4GPa, 5GPa, 6GPa, 7GPa, 8GPa, 10GPa, or the like, and the structural strength of the microcellular foam casing may be made to satisfy the use requirements of the sound generating apparatus 100.
According to one embodiment of the invention, the thermal deformation temperature of the microcellular foamed shell is not less than 130 ℃, specifically, the thermal deformation temperature of the microcellular foamed shell is not less than 130 ℃ under the condition that the bending stress is 1.8MPa, so that the microcellular foamed shell can be ensured to have high-temperature reliability. It should be noted that a heat distortion temperature of less than 130 ℃ will result in poor temperature resistance.
The thermal deformation temperature of the microcellular foamed housing of the present embodiment is easily satisfied with the requirement of high temperature resistance of the housing 10 of the sound generating apparatus 100 by limiting the thermal deformation temperature of the microcellular foamed housing to not less than 130 ℃, so that it can be normally used in normal environments and some extreme environments.
The testing principle of the thermal deformation temperature can refer to GB/T1634.1-2004, and the specific testing method is as follows:
1) Taking a flat part with uniform thickness on the shell, wherein the length, width and height dimensions are 80 multiplied by 10 multiplied by 4mm, the span is 64mm, the bending stress is 1.8MPa, the heating rate is 120 ℃/h, and the standard deflection is 0.34mm;
2) When the length, width and height dimensions < (80 multiplied by 10 multiplied by 4 mm), the sample strip dimensions can be selected from 15 multiplied by 5 multiplied by h (h is the shell thickness), the span is 10mm, the bending stress is 1.8MPa, the heating speed is 120 ℃/h, and the standard deflection calculation method comprises the following steps:
the calculation method refers to GB/T1634.1-2004.
According to one embodiment of the present invention, the casing 10 of the sound generating device 100 defines a front sound cavity and a rear sound cavity therein, and a portion of the casing 10 corresponding to the rear sound cavity is formed as a rear cavity casing, and at least a portion of the rear cavity casing is a microcellular foam casing.
Specifically, the housing 10 may be mainly composed of a rear cavity housing and a front cavity housing, wherein the rear cavity housing and the front cavity housing may be integrally formed, or the housing 10 may be formed by being connected by, for example, bonding. The housing 10 may define an acoustic chamber therein that may be used to house a sound generating structure such as the sound generating unit 20. The sound production monomer 20 can be separated the sound chamber for preceding sound chamber and back sound chamber, and preceding sound chamber and preceding chamber casing can be located the first side of sound production monomer 20, and back sound chamber and back chamber casing can be located the second side of sound production monomer 20.
At least a portion of the rear housing is a microcellular foamed housing, that is, the rear housing may include both microcellular foamed and non-microcellular foamed housings, or all portions of the rear housing may be microcellular foamed housings. The second foaming layer 113 in the micropore foaming shell in the back cavity casing is towards the back sound cavity, because at least a part of second alveolus in the second foaming layer 113 are the through-hole, and through being able to communicate with partial first alveolus, consequently increased the virtual volume in back sound cavity through first alveolus, be favorable to promoting sound generating mechanism's low frequency loudness, promote sound generating mechanism's acoustic performance.
In addition, a part of the front cavity shell or the whole front cavity shell can also be a micropore foaming shell, at the moment, sound waves can enter the first foam hole from the second foam hole in the micropore foaming shell and can be absorbed, so that the reflection of the sound waves in the front sound cavity can be reduced, standing waves can be removed, and the sound production effect is improved.
According to an embodiment of the present invention, the case 10 includes a first sub-case and a second sub-case, the first sub-case is bonded or integrally injection molded with the second sub-case, the first sub-case is formed as a microcellular foamed case, and the second sub-case is prepared by at least one of steel, aluminum alloy, copper alloy, titanium alloy, PP and a modified material thereof, PA and a modified material thereof, PET and a modified material thereof, PBT and a modified material thereof, PPs and a modified material thereof, PEI and a modified material thereof, PEEK and a modified material thereof, PEN and a modified material thereof, PPA and a modified material thereof, PC and a modified material thereof, SPS and a modified material thereof, TPX and a modified material thereof, POM and a modified material thereof, and LCP and a modified material thereof.
That is, the housing 10 of the sound generating device 100 according to the embodiment of the present invention may be assembled by a first sub-housing and a second sub-housing, and the two sub-housings may be connected by bonding or may be assembled by other methods such as injection molding. The first sub-shell is mainly a microporous foamed shell, and the second sub-shell can be made of metal materials such as steel, aluminum alloy, copper alloy and titanium alloy, or can be made of PP (polypropylene) and modified materials thereof, PA (polyamide) and modified materials thereof, PET (polyethylene terephthalate) and modified materials thereof, PBT (polybutylene terephthalate) and modified materials thereof, PPS (polyphenylene sulfide) and modified materials thereof, PEI (PEI) and modified materials thereof, PEEK (polyether ether ketone) and modified materials thereof, PEN (polyethylene naphthalate) and modified materials thereof, PPA (PPA) and modified materials thereof, PC (polycarbonate) and modified materials thereof, SPS and modified materials thereof, TPX and modified materials thereof, POM (polyoxymethylene) and modified materials thereof, LCP (liquid Crystal Polymer) and modified materials thereof, and the like.
As can be seen from the above embodiments, the casing 10 of the sound generating device 100 made of the microcellular foam casing engineering plastic material according to the embodiments of the present invention can satisfy the requirements of light weight, reliability and sound absorption, and when used in a rear sound cavity, can achieve the effect of providing a virtual sound cavity, thereby improving the acoustic performance.
The invention further provides a sound generating device 100, which comprises the shell 10 of the sound generating device 100 of any one of the embodiments, wherein the sound generating device 100 further comprises a sound generating unit 20 arranged in the shell 10, and the sound generating performance of the sound generating device 100 is realized by performing electroacoustic conversion on the sound generating unit 20. Wherein, the sound generating unit 20 may be a speaker unit. At least a part of the casing 10 of the sound generating device 100 is made of the microcellular foam casing of any of the above embodiments, which not only can satisfy the acoustic performance of the sound generating device 100, but also can satisfy the design requirements of lightness, thinness and mechanical properties of the sound generating device 100, and improves the applicability of the sound generating device 100 in various electronic devices.
When the sound generating device 100 is manufactured by the housing 10 and the sound generating unit 20 according to the embodiment of the present invention, the housing 10 of the sound generating device 100 may be manufactured by a micro foam injection molding process, and a speaker unit, that is, the sound generating unit 20 is accommodated in the housing 10. The loudspeaker unit comprises a vibration system and a magnetic circuit system. The sound generating unit 20 may be a diaphragm of a speaker. Sound wave that vocal monomer 20 sent partly can outwards propagate through the sound outlet, and another part can get into first cell through the second cell to thereby constantly reflect in first cell at least and realize the sound absorbing effect, thereby reduce sound generating mechanism 100's F0, promote sound generating mechanism 100's low frequency loudness.
The housing 10 of the sound generating device 100 may include an upper housing 11 and a lower housing 12, and the speaker unit is first fixed to the upper housing 11 or the lower housing 12, and then the upper housing 11 and the lower housing 12 are welded together by ultrasonic welding or glue bonding, thereby completing the assembly of the sound generating device 100. Wherein the upper shell 11 may be composed entirely of the first sub-shell, or at least by the first sub-shell and the second sub-shell. The lower shell 12 may also be composed entirely of the first sub-shell, or at least by the first sub-shell and the second sub-shell.
The housing 10 of the sound generating device 100 may also include an upper shell 11, a middle shell and a lower shell 12, wherein the upper shell 11 is connected with the lower shell 12 through the middle shell. At least a part of at least one of the upper, middle and lower shells 11, 12 is made of a microcellular foamed shell, i.e., the entirety of at least one of the upper, middle and lower shells 11, 12 is made of a microcellular foamed shell, or a part of at least one of the upper, middle and lower shells 11, 12 is made of a microcellular foamed shell.
The invention also provides an electronic device comprising the sound generating device 100 of any one of the above embodiments. 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, and the like, which is not limited in this respect.
Since the housing 10 of the sound generating device 100 according to the above-mentioned embodiment of the present invention has the above-mentioned technical effects, the sound generating device 100 and the electronic device according to the embodiment of the present invention also have the corresponding technical effects, that is, the F0 of the sound generating device 100 is reduced, the low-frequency loudness of the sound generating device 100 is improved, and the light weight of the electronic device product is realized while the reliability requirement of the electronic device product is ensured.
The housing 10 of the sound generating device 100 of the present invention will be described in detail with reference to specific examples and comparative examples.
Comparative example
In the present comparative example, the speaker module was assembled from a housing and a speaker unit. When the shell is prepared, 80wt% of PC is used as matrix resin, 20wt% of glass fiber is added as a reinforcing agent, and the shell is formed by modification granulation through a double-screw extruder and injection molding through an injection molding machine. The outer shell is a single-layer structure.
Example 1
In the present embodiment, the speaker module is assembled by the housing 10 and the speaker unit. TPX with the weight percent of 90 is used as matrix resin, carbon fiber with the weight percent of 10 is added as a reinforcing agent, and the shell 10 is formed by micro-foaming injection molding through an injection molding machine after modification granulation through a double-screw extruder. In this case, the case 10 has a three-layer structure including the skin layer 111, the first foam layer 112, and the second foam layer 113.
Example 2
In the present embodiment, the speaker module is assembled by the housing 10 and the speaker unit. The housing 10 is formed by using 85wt% of SPS as a matrix resin, adding 15wt% of glass fiber as a reinforcing agent, performing modification granulation by a double-screw extruder, and performing micro-foaming injection molding by an injection molding machine. In this case, the case 10 has a three-layer structure including the skin layer 111, the first foam layer 112, and the second foam layer 113.
Example 3
In the present embodiment, the speaker module is assembled by the housing 10 and the speaker unit. 75wt% of PC is used as matrix resin, 25wt% of carbon fiber is added as reinforcing agent, and after modification granulation by a double-screw extruder, the shell 10 is formed by micro-foaming injection molding by an injection molding machine. In this case, the housing 10 has a three-layer structure including a skin layer 111, a first foam layer 112, and a second foam layer 113.
Example 4
In the present embodiment, the speaker module is assembled by the housing 10 and the speaker unit. 70wt% of PA66 is used as matrix resin, 30wt% of carbon fiber is added as a reinforcing agent, and after modification and granulation through a double-screw extruder, the shell 10 is formed through micro-foaming injection molding by an injection molding machine. In this case, the case 10 has a three-layer structure including the skin layer 111, the first foam layer 112, and the second foam layer 113.
Example 5
In the present embodiment, the speaker module is assembled by the housing 10 and the speaker unit. 70wt% of PA12 is used as matrix resin, 30wt% of carbon fiber is added as reinforcing agent, and after modification granulation by a double-screw extruder, the shell 10 is formed by micro-foaming injection molding by an injection molding machine. In this case, the case 10 has a three-layer structure including the skin layer 111, the first foam layer 112, and the second foam layer 113.
Example 6
In the present embodiment, the speaker module is assembled by the housing 10 and the speaker unit. PPA of 80wt% is used as matrix resin, carbon fiber of 20wt% is added as reinforcing agent, and after modification granulation by a double screw extruder, the shell 10 is formed by micro-foaming injection molding by an injection molding machine. In this case, the housing 10 has a three-layer structure including a skin layer 111, a first foam layer 112, and a second foam layer 113.
For comparison, the formulation of the raw materials, the molding process, and the structure of the formed housing of the comparative example, and the formulation of the raw materials, the molding process, and the structure of the formed case 10 of examples 1 to 6 are shown in table 1 below.
TABLE 1 Material composition and Molding Process
The comparative examples, materials of examples 1 to 6 and products were tested as follows.
The case 10 prepared in examples 1 to 6 and the case prepared in comparative example were subjected to density, flexural modulus, and heat distortion temperature tests, respectively; and assembling the housing 10 obtained in embodiments 1 to 6 and the housing prepared in the comparative example with a speaker monomer to obtain different speaker modules, respectively performing an acoustic test on each speaker module to obtain an actually measured resonant frequency F0 of each speaker module and the speaker module, and the test results are shown in table 2 below.
TABLE 2 comparison of Properties
As can be seen from Table 2, the density of the cases 10 of examples 1 to 6 was smaller than that of the outer case of the comparative example, wherein the density of the cases 10 of examples 4 and 6 was the largest in each example and was 1.27g/cm 3 Case density of 1.35g/cm or less than that of comparative example 3 . Also, the resonant frequency F0 of the speaker modules of examples 1 to 6 is significantly lower than the resonant frequency F0 of the speaker module of comparative example, wherein the resonant frequency F0 of the speaker module of example 1 is the largest in each example, the resonant frequency F0 of example 1 is 1075Hz, the resonant frequency F0 of the speaker module of comparative example is 1250Hz, and the resonant frequency of the speaker module of comparative example is significantly higher than the resonant frequency F0 of the speaker module of example 1, so that the low frequency loudness of the speaker module of each example is increased compared to the speaker module of comparative example.
In addition, the flexural modulus of the cases 10 of examples 1 to 6 is greater than that of the case of the comparative example, wherein the flexural modulus of the cases 10 of examples 1 and 6 is the smallest, 5.2Gpa, and 5.0Gpa greater than that of the case of the comparative example. That is, each of the embodiments can satisfy the requirement of the flexural modulus of the housing 10 of the speaker module.
Also, the heat distortion temperature of the case 10 of examples 1 to 6 is not less than that of the case of comparative example, wherein the heat distortion temperature of the case 10 of example 3 is the smallest, 135 ℃, which is equal to the heat distortion temperature of the case of comparative example, 135 ℃. That is, each of the embodiments can satisfy the requirement of high temperature resistance of the housing 10 of the speaker module.
As can be seen from the combination of tables 1 and 2, the case 10 of example 3 and the outer case of the comparative example both use PC and glass fiber as raw materials, since the density of glass fiber is greater than that of PC, while the content of glass fiber in the case 10 of example 3 is greater than that of glass fiber in the outer case of the comparative example, and as is apparent from Table 2, the density of the case 10 of example 3 is 1.25g/cm 3 The density of the outer shell of the comparative example was 1.35g/cm 3 The density of the case 10 of example 3 is less than that of the comparative example case. That is, since the case 10 of the present invention has an advantage of low density when the same kind of raw material is used, the case 10 of the present invention can be used to reduce the weight with the same outer dimensions.
As can be seen from tables 1 and 2, the comparative example has a high density of the material and a heavy weight of the case 10 because the foaming process is not adopted; the materials of the embodiments 1 to 6 have smaller density, and can meet the requirement of light weight of the loudspeaker module;
in addition, frequency response curves of the speaker modules of examples 1 to 6 and the speaker module of the comparative example are shown in fig. 3 and 4, the abscissa of fig. 3 and 4 is frequency (Hz), and the ordinate is loudness (dB), and it can be seen from fig. 3 that the speaker module of the comparative example has a low frequency response; the loudspeaker module of embodiment 1 has a high low frequency response and better low frequency loudness. As can be seen from fig. 4, the curves corresponding to the low-frequency responses of the speaker modules of examples 1 to 6 approximately coincide, so that the low-frequency loudness of examples 1 to 6 is better than that of the comparative example.
In summary, according to the housing 10 of the sound generating apparatus 100, the sound generating apparatus 100 and the electronic device of the embodiment of the present invention, the microcellular foamed housing is obtained by engineering plastic materials, and the microcellular foamed housing has the skin layer 111, the first foamed layer 112 and the second foamed layer 113, and since the first foamed layer 112 and the second foamed layer 113 have the foam holes therein, not only can the purpose of light weight be achieved, but also the volume of the rear sound cavity can be enlarged when the microcellular foamed housing is used in the rear sound cavity, a virtual sound cavity is provided, and the acoustic performance of the sound generating apparatus 100 is improved. In addition, when the engineering plastic material and the reinforced fiber are injection molded, the housing 10 of the sound generating device 100 can still have light weight.
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 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 (15)
1. A shell of a sound generating device is characterized in that a front sound cavity and a rear sound cavity are limited in the shell of the sound generating device, the shell and a part corresponding to the rear sound cavity form a rear cavity shell, at least one part of the rear cavity shell is a micropore foaming shell, raw materials of the micropore foaming shell comprise engineering plastic materials, the micropore foaming shell comprises a skin layer, a first foaming layer and a second foaming layer which are sequentially stacked from outside to inside, the first foaming layer and the second foaming layer are of a foaming structure,
wherein, the pore diameter of the pore canal in the epidermis layer is less than 0.5 μm or no pore canal in the epidermis layer;
the first foaming layer is provided with first foam holes, and the pore diameter of the first foam holes is between 0.0005 and 0.5 microns;
the second foamed layer has second cells, the second cell is the through-hole, and at least a part the second cell with first cell intercommunication, the aperture of second cell is between 0.5 mu m ~ 50 mu m, with first cell intercommunication the aperture of at least a part of second cell is greater than the aperture of first cell.
2. The casing of the sound emitting device of claim 1, wherein a pore size of at least one of the second cells and the first cells is gradually reduced in a direction from the second foam layer toward the first foam layer.
3. The housing of the sound generating apparatus as claimed in claim 1, wherein the first foamed layer and the second foamed layer are integrally foamed.
4. The housing of a sound generating device as defined in claim 1, wherein said cells are distributed in said skin layer at a density of more than 0 cells/cm 3 And is less than or equal to 10 3 Per cm 3 。
5. The sound generating apparatus casing as claimed in claim 1, wherein the first cells in the first foam layer have a distribution density of 10 10 Per cm 3 ～10 15 Per cm 3 The distribution density of the second cells in the second foam layer is 10 9 Per cm 3 ～10 12 Per cm 3 。
6. The housing of a sound emitting device according to claim 1, wherein said engineering plastic material comprises at least one of poly 4 methyl-1-pentene, polypropylene, syndiotactic polystyrene, PA66, PA6, PA68, PA610, PA612, PA9, PA1010, PA1012, PA11, PA12, PA1212, PA1313, polycarbonate, polyoxymethylene, polyphenylene oxide, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyphenylene sulfide, polyarylate, polyetheretherketone, liquid crystal polymer.
7. The housing of claim 1, wherein the feedstock further comprises a reinforcing agent, the reinforcing agent comprising at least one of glass fibers, carbon fibers, basalt fibers, and polymer fibers.
8. The housing of claim 7, wherein the reinforcing agent is present in an amount of 10wt% to 40wt% based on the total weight of the raw materials.
9. The casing of the sound production device according to claim 1, wherein the raw material further comprises a nano filler, and the nano filler comprises at least one of silica, carbon black, clay, carbon nanotubes, calcium carbonate, cellulose, montmorillonite, alumina, graphene oxide, talc, mica powder, kaolin, wollastonite, diatomite, and titanium dioxide.
10. The housing of a sound generating device as defined in claim 1, wherein said microcellular foamed housing has a density of 0.9g/cm 3 ～1.3g/cm 3 。
11. The casing of the sound generating apparatus as claimed in claim 1, wherein the microcellular foamed casing has a flexural modulus of 3.5GPa or more.
12. The casing of the sound generating apparatus as claimed in claim 1, wherein the microcellular foamed casing has a heat distortion temperature of 130 ℃ or more.
13. The housing of a sound emitting device according to any one of claims 1 to 12, wherein the housing comprises a first sub-housing and a second sub-housing, the first sub-housing is bonded to or integrally injection-molded with the second sub-housing, the first sub-housing is formed as the microcellular foamed housing, and the second sub-housing is manufactured by at least one of steel, aluminum alloy, copper alloy, titanium alloy, PP and its modified material, PA and its modified material, PET and its modified material, PBT and its modified material, PPs and its modified material, PEI and its modified material, PEEK and its modified material, PEN and its modified material, PPA and its modified material, PC and its modified material, SPS and its modified material, TPX and its modified material, POM and its modified material, and LCP and its modified material.
14. A sound generating device, comprising:
the housing of the sound emitting device of any one of claims 1-13.
15. An electronic device, characterized in that it comprises a sound-emitting device according to claim 14.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106210999A (en) * | 2016-08-31 | 2016-12-07 | 歌尔股份有限公司 | Speaker module |
| CN208638528U (en) * | 2018-08-06 | 2019-03-22 | 瑞声科技(新加坡)有限公司 | Loudspeaker enclosure |
| WO2022161467A1 (en) * | 2021-01-28 | 2022-08-04 | 镇江贝斯特新材料有限公司 | Acoustic reinforcing material block and application thereof, micro loudspeaker and electronic device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1229451A (en) * | 1968-01-18 | 1971-04-21 | ||
| GB2123250A (en) * | 1982-06-15 | 1984-01-25 | Psycho Acoustic Res | Loudspeaker enclosures |
| GB2222744A (en) * | 1988-09-13 | 1990-03-14 | B & W Loudspeakers | Improvements in and relating to loudspeaker enclosures |
| CN107147979B (en) * | 2017-06-02 | 2019-02-01 | 歌尔股份有限公司 | Loudspeaker mould group |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106210999A (en) * | 2016-08-31 | 2016-12-07 | 歌尔股份有限公司 | Speaker module |
| CN208638528U (en) * | 2018-08-06 | 2019-03-22 | 瑞声科技(新加坡)有限公司 | Loudspeaker enclosure |
| WO2022161467A1 (en) * | 2021-01-28 | 2022-08-04 | 镇江贝斯特新材料有限公司 | Acoustic reinforcing material block and application thereof, micro loudspeaker and electronic device |
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