Loudspeaker housing, loudspeaker and electronic device

Abstract

The application discloses a loudspeaker shell, a loudspeaker and an electronic device, wherein a material of at least part of a shell of the loudspeaker shell is composed of a plastic material and short-cut carbon fibers, and the at least part of the shell of the loudspeaker shell is an injection molding structure. The loudspeaker shell of the technical scheme can use a mixture of the plastic material and the short-cut carbon fibers as injection molding material, so that the structural strength and modulus are improved, and the acoustic effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of loudspeaker, in particular to a loudspeaker shell, a loudspeaker and an electronic device. BACKGROUND

[0002] With the development of science and technology, people have higher and higher requirements for the performance of electronic devices, and the performance of the loudspeaker, which converts electrical signals into sound waves for playing, has a great influence on the performance of the electronic device. The loudspeaker is accommodated in the loudspeaker shell, so the shell material will affect the acoustic performance of the loudspeaker.

[0003] At present, the shell is generally made of plastic, but the loudspeaker shell formed by this material has a large thickness and a relatively small internal acoustic cavity volume, which is not conducive to acoustic performance. Carbon fiber has the advantages of high strength and light weight, and is also used in the field of loudspeakers. However, the application of carbon fiber is usually to use long fibers, which are woven or hot-pressed into a sheet material, and then used in combination with other materials. However, this material is not suitable for complex shell structures and is limited in use. SUMMARY

[0004] The main purpose of the present application is to provide a loudspeaker shell, which is formed by injection molding of short fibers and plastic materials to ensure the structural strength and acoustic performance of the loudspeaker shell while expanding the application range.

[0005] To achieve the above-mentioned purpose, at least part of the shell material of the loudspeaker shell is a mixture of plastic material and chopped carbon fiber, and the at least part of the shell of the loudspeaker shell is an injection molding structure.

[0006] In an optional embodiment, the length of the chopped carbon fiber ranges from 0.2mm to 4mm.

[0007] In an optional embodiment, the proportion of the chopped carbon fiber in the material of the loudspeaker shell ranges from 10% to 40%.

[0008] In an optional embodiment, the plastic material is at least one of polyamide, polyphthalamide, acrylonitrile-butadiene-styrene, polycarbonate, polypropylene and polyphenylene sulfide.

[0009] In an optional embodiment, the tensile strength of the loudspeaker shell is greater than 145MPa, the impact strength is greater than 3KJ / m2, and the bending strength is greater than 214MPa.

[0010] In an optional embodiment, the resonance frequency of the loudspeaker shell is greater than 8000Hz.

[0011] In an optional embodiment, the heat distortion temperature of the loudspeaker shell is greater than 120℃.

[0012] In an optional embodiment, the speaker housing includes an upper shell and a lower shell, the upper shell and the lower shell being connected to each other and enclosing a receiving cavity, and the material of the upper shell and / or the lower shell is a mixture of plastic material and chopped carbon fiber.

[0013] The present invention also proposes a loudspeaker, the loudspeaker comprising:

[0014] A speaker housing having a receiving cavity, the speaker housing being any of the speaker housings described above; and

[0015] A sound-emitting unit, wherein the sound-emitting unit is disposed within the receiving cavity.

[0016] The present invention also proposes an electronic device, which includes a speaker as described above.

[0017] The speaker housing of this invention comprises at least a portion made of a mixture of plastic material and chopped carbon fibers, which is injection molded using this mixture. Compared to the use of long fibers, the size of the chopped carbon fibers is not limited, thus the shape of the portion of the housing using this mixture is also unrestricted, allowing for the injection molding of speaker housings with complex structures. Furthermore, the addition of chopped carbon fibers to the material of at least a portion of the speaker housing significantly improves structural strength and impact resistance, and provides better high-temperature resistance and a higher resonant frequency, thereby enhancing acoustic performance. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the speaker structure of a speaker housing according to an embodiment of the present invention;

[0020] Figure 2 for Figure 1 A structural schematic diagram of the speaker from another perspective;

[0021] Figure 3 for Figure 1 The exploded view of the speaker shown;

[0022] Figure 4 This is a schematic diagram of the material used in the injection-molded part of a speaker housing according to an embodiment of the present invention.

[0023] Brief Description of Drawings

[0024] Reference Name Reference Name 100 Speaker 10a Plastic material 10 Speaker housing 10b Chopped carbon fiber 11 Upper housing 20 Sound-emitting element 12 Lower housing

[0025] The objectives, features and advantages of the present application will be further illustrated by the following embodiments in conjunction with the accompanying drawings. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work under the premise of the present application are within the protection scope of the present application.

[0027] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directionality indications also change accordingly.

[0028] In the present application, unless otherwise explicitly specified and limited, the terms “connection”, “fixation”, etc. should be understood in a broad sense, for example, “fixation” can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] In addition, the description such as “first”, “second” and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first”, “second” can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that the technical solutions can be realized by those skilled in the art, and when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0030] The present application provides a speaker housing 10 for accommodating a speaker 100 unit. By applying a material mixed with plastic material 10a and short carbon fiber 10b to the speaker housing 10, the structural strength and acoustic performance of the speaker housing 10 are improved, and the speaker housing 10 can be manufactured by injection molding regardless of the complexity of the structure, and the speaker housing 10 with complex structure can be easily manufactured.

[0031] Please refer to Figure 1 and Figure 4 The specific structure of the speaker housing 10 provided by the present application will be described below in specific embodiments. In an embodiment of the present application, at least part of the housing of the speaker housing 10 is made of a mixture of plastic material 10a and short carbon fiber 10b, and the at least part of the housing of the speaker housing 10 is an injection molded structure.

[0032] In this embodiment, at least part of the housing of the speaker housing 10 is integrally molded by injection molding, which can obtain a housing with an integral structure, improve the structural stability and processing efficiency. Here, the material of at least part of the housing of the injection molded speaker housing 10 is a mixture of plastic material 10a and short carbon fiber 10b, and the plastic material 10a is various plastic materials that are already in use, for example, the plastic material 10a can be at least one of polyamide (PA), polyphthalamide (PPA), acrylonitrile-butadiene-styrene (ABS), polycarbonate (PP), polypropylene (PC) and polyphenylene sulfide (PPS). That is, the plastic material 10a can be a single polyamide, polyphthalamide, acrylonitrile-butadiene-styrene, polycarbonate, polypropylene or polyphenylene sulfide, or a mixture of two of polyamide, polyphthalamide, acrylonitrile-butadiene-styrene, polycarbonate, polypropylene and polyphenylene sulfide, or a mixture of any three, or a mixture of any four, or a mixture of any five, or a mixture of the above six materials, which is not limited here. The short carbon fiber 10b is also a material that is already in use, which is made by shortening carbon fiber filaments, and the length is generally less than 10 mm. It can be understood that carbon fiber is a fibrous carbon material with high strength, small density, high corrosion resistance and heat resistance, and good electrical conductivity. The density of carbon fiber is 1750 kg / m3, and the carbon content is more than 95%, so the short carbon fiber 10b also has the above properties. The mixture of short carbon fiber 10b and plastic material 10a can be considered as a composite material of carbon fiber reinforced plastic. Here, the composite material is applied to the speaker housing 10, so that the speaker housing 10 can exhibit the excellent performance of the short carbon fiber 10b.

[0033] Here, the speaker shell 10 is generally in a split structure, and the material of the part of the shell in the split structure can be a mixture of plastic material 10a and chopped carbon fiber 10b, and the mixture is integrally formed by injection molding, and the remaining shell part is an existing plastic material or a metal material. All the shell in the split structure can also be made of a mixture of plastic material 10a and chopped carbon fiber 10b, and integrally formed by injection molding, and then combined to form the speaker shell 10.

[0034] The material of the speaker shell 10 of the technical scheme of the present application is a mixture of plastic material 10a and chopped carbon fiber 10b, and the speaker shell 10 is formed by injection molding of the mixture. Compared with the use of long fibers, the size of the chopped carbon fiber 10b is not limited, so that the shape of the speaker shell 10 using the mixed material is not limited, and the speaker shell 10 with complex structure can be injection molded. Moreover, the addition of chopped carbon fiber 10b in the material of the speaker shell 10 can significantly improve the structural strength and impact resistance, and can have better high temperature resistance and higher resonance frequency, so that the thickness and weight of the speaker shell 10 can be reduced, and the acoustic cavity formed by the speaker shell 10 can be improved, thereby improving the acoustic effect.

[0035] In an optional embodiment, the length of the chopped carbon fiber 10b ranges from 0.2mm to 4mm.

[0036] In this embodiment, in order to obtain better structural strength, the length of the chopped carbon fiber 10b ranges from 0.2mm to 4mm, for example, 0.2mm, 0.5mm, 1mm, 2mm, 3mm and 4mm. The chopped carbon fiber 10b in this size range is smaller and can be more evenly distributed when mixed with the plastic material 10a, so that the speaker shell 10 is injection molded and evenly distributed in the speaker shell 10, thereby ensuring that the structural strength of each part is improved, and better results can be obtained in impact resistance tests or tensile tests.

[0037] In an optional embodiment, the proportion of the chopped carbon fiber 10b in the material of the speaker shell 10 ranges from 10% to 40%.

[0038] In this embodiment, in order to obtain better structural performance as much as possible, the proportion of the chopped carbon fiber 10b in the material of the speaker shell 10 should not be too small, that is, the proportion in the material compounded with the plastic material 10a. Of course, the basic material of the speaker shell 10 is still the plastic material 10a, which can retain the original elasticity, so the proportion of the chopped carbon fiber 10b in the material of the speaker shell 10 should not be too large. Therefore, the proportion of the chopped carbon fiber 10b in the material of the speaker shell 10 is set to 10% to 40%, for example, 10%, 20%, 30%, and 40%, so that the basic elasticity of the speaker shell 10 can be retained while having a better reinforcing effect, thereby achieving better overall effect.

[0039] Please refer to Tables 1-1 and 1-2 below for performance test experiments of the injection molded speaker shell 10 using the above technical solution.

[0040] Table 1-1

[0041]

[0042] Table 1-2

[0043]

[0044] In this experiment, two kinds of plastic materials 10a were used as the base, and the content of the chopped carbon fiber 10b was divided into four kinds, which were mixed and then injection molded. The injection molding conditions can refer to the existing injection molding conditions of the speaker shell 10. The tests include impact strength, tensile strength, elongation, tensile modulus, bending strength, bending modulus, and melting temperature under notched and unnotched conditions.

[0045] In the first embodiment, the plastic material 10a in the material of the speaker shell 10 is polyamide (PA), and the polyamide is selected as the type of nylon 6 / 6. In this material, 10% of the chopped carbon fiber 10b is added, and the size of the chopped carbon fiber 10b is between 0.2mm and 4mm. After injection molding, the shape of the speaker shell 10 can refer to Figure 1 and Figure 2 The speaker shell 10 with this structure was tested, and the impact strength was 3kJ / m2 with a 4mm notch, and the impact strength was 26kJ / m2 without a 4mm notch, the tensile strength was 145MPa, the elongation was 2.0-3.0%, the tensile modulus was 9000MPa, the bending strength was 215MPa, the bending modulus was 7000, and the melting temperature was 275-300℃. The performance is improved compared with the performance of the existing plastic material speaker shell 10.

[0046] In the second, third and fourth embodiments, other conditions remain unchanged, and unlike the first embodiment, the proportion of the added short carbon fiber 10b is increased, by 20%, 30% and 40% respectively. As can be seen from the table, with or without a 4mm gap, the impact strength gradually increases, the tensile strength gradually increases, the elongation first increases and then decreases, the tensile modulus, the bending strength and the bending modulus gradually increase, and the melting temperature remains unchanged, all within a good range.

[0047] In the fifth embodiment, the plastic material 10a in the material of the speaker shell 10 is polyphthalamide (PPA), and 10% of short carbon fiber 10b is added to the material. The size of the short carbon fiber 10b is between 0.2mm and 4mm. After injection molding, the shape of the speaker shell 10 can refer to Figure 1 and Figure 2 The speaker shell 10 of this structure is tested, and the tensile strength is 152MPa, the elongation is 1.0-2.0%, the tensile modulus is 11032MPa, the bending strength is 214MPa, the bending modulus is 8274, and the melting temperature is 302-329℃. The performance is also improved compared to the performance of the existing plastic speaker shell 10.

[0048] In the sixth, seventh and eighth embodiments, other conditions remain unchanged, and unlike the fifth embodiment, the proportion of the added short carbon fiber 10b is increased, by 20%, 30% and 40% respectively. As can be seen from the table, with or without a 4mm gap, the impact strength gradually increases, the tensile strength gradually increases, the elongation decreases, the tensile modulus, the bending strength and the bending modulus gradually increase, and the melting temperature remains almost unchanged, all within a good range.

[0049] In summary, the performance comparison of the two plastic materials 10a shows that when the plastic material 10a is polyamide (PA) and the polyamide is nylon 6 / 6, and 40% of short carbon fiber 10b is added to the material, the size of the short carbon fiber 10b is between 0.2mm and 4mm, the impact resistance, tensile strength, bending strength, tensile modulus and bending modulus are all good. When the plastic material 10a is polyphthalamide (PPA), and 40% of short carbon fiber 10b is added to the material, the size of the short carbon fiber 10b is between 0.2mm and 4mm, the tensile strength, bending strength, tensile modulus and bending modulus are all the best, and the impact resistance is slightly lower than that of nylon combined with 40% short carbon fiber 10b.

[0050] For the use of the mixed material of the plastic material 10a and the chopped carbon fiber 10b, in order to further reflect the advantages of its strength and modulus, the mixed material of adding glass fiber material to the plastic material 10a is also analyzed, and the analysis results are shown in Tables 1-3 and 1-4:

[0051] Table 1-3

[0052]

[0053] Table 1-4

[0054]

[0055] As shown above, different kinds of polycarbonate materials are combined with glass fiber (CF) respectively, and the obtained bending strength, tensile strength, tensile modulus or bending modulus are far less than the performance of the mixed material of the plastic material 10a and the chopped carbon fiber 10b after injection molding. It can be seen that using the mixed material of the plastic material 10a and the chopped carbon fiber 10b for injection molding of the speaker shell 10 can have a relatively obvious performance advantage.

[0056] In an optional embodiment, the tensile strength of the speaker shell 10 is greater than 145 MPa, the impact strength is greater than 3 KJ / m2, and the bending strength is greater than 214 MPa.

[0057] It can be seen that the mixture of the plastic material 10a and the chopped carbon fiber 10b can achieve a good tensile strength, and the combination of the tensile strength greater than 145 MPa, the impact strength greater than 3 KJ / m2, and the bending strength greater than 214 MPa is selected, so that the speaker shell 10 can maintain good integrity and impact resistance when subjected to accidental impact or falling, thereby improving the stability of the internal structure of the speaker 100.

[0058] In an optional embodiment, the resonance frequency of the speaker shell 10 is greater than 8000 Hz.

[0059] In this embodiment, after adding the chopped carbon fiber 10b, the modulus of the injection molded speaker shell 10 is greatly increased, so that the natural frequency and the resonance frequency are increased. After structure optimization, the combination of the resonance frequency greater than 8000 Hz can be selected, for example, 8200 Hz or 8500 Hz, etc. Compared with the existing high frequency peak of more than 7000 Hz, it is still higher. In this way, when the speaker 100 works, these peak frequency points can be avoided, the sharp harmful frequency points are reduced, and the high frequency effect is improved.

[0060] In an optional embodiment, the thermal deformation temperature of the speaker housing 10 is greater than 120℃. The thermal deformation temperature of the speaker housing can be greater than 120℃, for example, 125℃, 130℃, 140℃, etc. The thermal deformation temperature in this range enables the speaker housing 10 to withstand high heat generated when the sound emitting unit 20 is in operation, prevents severe deformation due to heat, and improves the structural stability and high-temperature deformation resistance of the speaker housing 10.

[0061] For reference Figures 1 to 3 It can be understood that, for the convenience of assembly, the speaker housing 10 includes an upper shell 11 and a lower shell 12. The upper shell 11 is connected to the lower shell 12 in correspondence and encloses a receiving cavity. The material of the upper shell 11 and / or the lower shell 12 is a mixture of plastic material 10a and chopped carbon fiber 10b.

[0062] It can be understood that the receiving cavity is used to accommodate the sound emitting unit 20 and protect the sound emitting unit 20. Here, the material of the upper shell 11 and the lower shell 12 can both be added with chopped carbon fiber 10b. Therefore, under the same requirement of structural strength, the thickness of the upper shell 11 and the lower shell 12 can be made thinner, which can form a larger acoustic cavity volume compared with the existing plastic shell, effectively improving the acoustic performance of the speaker 100. Here, the connection mode of the upper shell 11 and the lower shell 12 can be bonding or welding, or both bonding and welding, or other fixed connection modes, which are not limited here. It can be understood that the upper shell 11 and the lower shell 12 enclose a receiving cavity, so at least one of them can form a receiving space, and the other covers the opening of the receiving space, thereby ensuring the volume of the receiving cavity.

[0063] Of course, in other embodiments, only one of the upper shell 11 and the lower shell 12 can be made of a mixture of plastic material 10a and chopped carbon fiber 10b, and the other can be made of metal or conventional plastic. Alternatively, at least part of the structure of at least one of the upper shell 11 and the lower shell 12 can be made of a mixture of plastic material 10a and chopped carbon fiber 10b.

[0064] On the basis of any one of the above embodiments, the speaker housing 10 can further include a middle shell (not shown) arranged between the upper shell 11 and the lower shell 12 for fixing the sound emitting unit 20. At least part of the structure of the middle shell can also be made of a mixture of plastic material 10a and chopped carbon fiber 10b, thereby improving the structural stability and impact resistance of the middle shell and the mounting stability of the sound emitting unit.

[0065] For reference Figure 1 and Figure 3The application further provides a loudspeaker 100, which comprises a loudspeaker shell 10 and a sound emitting unit 20, the loudspeaker shell 10 is formed with a containing cavity, and the loudspeaker shell 10 is the loudspeaker shell 10 according to any one of the above embodiments; the sound emitting unit 20 is arranged in the containing cavity. Since the specific structure of the loudspeaker shell 10 in the loudspeaker 100 is referred to the above embodiments, all the beneficial effects brought by the technical solutions of the above embodiments are at least possessed, and will not be repeated here.

[0066] It is known that the loudspeaker 100 is a device for converting electrical signals into acoustic signals, and the main component is the sound emitting unit 20, which comprises a support assembly, a vibration system and a magnetic circuit system, etc. The support assembly comprises a unit shell and a magnetic conducting plate arranged at the inner edge of the unit shell, the vibration system comprises a diaphragm and a voice coil, and the magnetic circuit system comprises a magnetic yoke and a center magnetic circuit part and a side magnetic circuit part arranged on the magnetic yoke. The side magnetic circuit part is spacedly arranged around the periphery of the center magnetic circuit part, and the gap between the side magnetic circuit part and the center magnetic circuit part forms a magnetic gap. One end of the voice coil is fixed to the diaphragm, and the other end extends into the magnetic gap, and after the alternating current is passed, the voice coil will be forced to reciprocate up and down under the action of the magnetic field, thereby driving the diaphragm to vibrate and realizing the sound emitting function.

[0067] Optionally, the lower shell 12 is formed with a containing space, the sound emitting unit 20 is installed in the lower shell 12, and then the upper shell 11 and the lower shell 12 are connected to complete the assembly. The lower shell 12 has a mounting port and a plurality of annular mounting positioning structures, and by adding the short-cut carbon fiber 10b, a single protrusion or clamping structure formed in the containing space can be realized, so as to meet the demand of the complex assembly relationship, and ensure the accuracy of the installation size and the enhancement of the strength.

[0068] The application further provides an electronic device (not shown), which comprises the loudspeaker 100 according to any one of the above embodiments. Since the specific structure of the loudspeaker 100 in the electronic device is referred to the above embodiments, all the beneficial effects brought by the technical solutions of the above embodiments are at least possessed, and will not be repeated here.

[0069] The electronic device can be, but is not limited to, a mobile phone, a notebook computer, a tablet computer, a personal digital assistant (PDA), an e-book reader, an MP3 (Moving Picture Experts Group Audio Layer III) player, an MP4 (Moving Picture Experts Group Audio Layer IV) player, a wearable device, a navigator, a palm game console, a virtual and reality device, an augmented reality device, and the like.

[0070] The above merely provides the preferred embodiments of the present application, but does not limit the patent scope of the present application. Any equivalent structure variation made according to the present application, or direct / indirect application in other related technical fields, falls within the patent protection scope of the present application.

Claims

1. A loudspeaker enclosure, characterized by, The material of at least part of the speaker housing is a mixture of plastic material and chopped carbon fibers, and the at least part of the speaker housing is an injection molding structure; The proportion of the chopped carbon fibers in the material of the speaker housing ranges from 10% to 40%; The length of the chopped carbon fibers ranges from 0.2 mm to 3 mm; The resonance frequency of the speaker housing is greater than 8000 Hz; The plastic material is at least one of polyphthalamide and polyphenylene sulfide.

2. The speaker enclosure of claim 1, wherein, The tensile strength of the speaker housing is greater than 145 MPa, the impact strength is greater than 3 KJ / m2, and the bending strength is greater than 214 MPa.

3. The speaker enclosure of claim 1, wherein, The heat distortion temperature of the speaker housing is greater than 120℃.

4. The speaker enclosure of claim 1, wherein, The speaker housing comprises an upper shell and a lower shell, the upper shell and the lower shell are correspondingly connected and enclose a containing cavity, and the material of the upper shell and / or the lower shell is a mixture of plastic material and chopped carbon fibers.

5. A loudspeaker, characterized by The speaker comprises: a speaker housing, the speaker housing is formed with a containing cavity, and the speaker housing is the speaker housing according to any one of claims 1 to 4; and a sound emitting unit, the sound emitting unit is arranged in the containing cavity.

6. An electronic device, comprising: The electronic device comprises the speaker according to claim 5.

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