Speaker box and electronic device
The speaker box design addresses heat dissipation and EMC grounding issues by connecting the magnetic circuit assembly to a metal plate via a conductive sheet, using graphene for efficient cooling and grounding, ensuring reliable performance and compatibility.
Patent Information
- Application Number
- PCT/CN2024/102432
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2026-01-02
AI Technical Summary
Existing back-to-back transducer designs face issues with heat dissipation and EMC grounding due to the enclosed magnetic circuit assembly, leading to potential damage and compromised performance.
A speaker box design featuring a housing with a metal plate and a conductive sheet connecting the magnetic circuit assembly to the metal plate for thermal and electrical conductivity, using a graphene sheet for enhanced heat dissipation and grounding the metal plate for improved EMC performance.
The design ensures efficient cooling and proper grounding, maintaining transducer performance and longevity while enhancing EMC compatibility.
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Figure CN2024102432_02012026_PF_FP_ABST
Abstract
Description
SPEAKER BOX AND ELECTRONIC DEVICETECHNICAL FIELD
[0001] The present disclosure relates generally to a speaker box, and more specifically, to a speaker box having a back-to-back transducer. The present disclosure also relates to an electronic device comprising such a speaker box.BACKGROUND
[0002] In the field of audio technology, particularly in the design of speakers for mobile and portable electronic devices, the use of back-to-back (B2B) transducers has become increasingly common due to their technical advantages of vibration cancelation and reduction and enhanced audio performance. The back-to-back transducers typically feature two diaphragm assemblies that share a single magnetic circuit assembly. Each of the two diaphragm assemblies is placed on either side of the magnetic circuit assembly and the transducer frame, and they are sealed to ensure the enclosure is airtight and does not leak sound.
[0003] However, existing back-to-back transducers designs face several significant technical challenges. Firstly, since the magnetic circuit assembly is enclosed within the transducer, it cannot ventilate to the external atmosphere, resulting in poor heat dissipation. If the heat generated during operation of the transducer cannot be effectively dissipated, it leads to an increase in internal temperature, potentially damaging the magnetic circuit assembly and associated electronic elements of the transducer over time.
[0004] Secondly, to enhance the EMC (Electromagnetic Compatibility) performance of the speaker box and meet the EMC requirement of the electronic device to which the speaker box is mounted, it is desirable that the magnetic circuit assembly is properly grounded. However, in current back-to-back transducer designs, the magnetic circuit assembly is enclosed and not exposed, which complicates the implementation of an effective grounding. This limitation may compromise the EMC performance of both the speaker box and the electronic device to which the speaker box is mounted.
[0005] In light of the above, the present disclosure aims to introduce a new speaker design that addresses at least some of the deficiencies in existing technology.SUMMARY OF THE INVENTION
[0006] The present disclosure intended to provide a new speaker design that addresses at least some of the deficiencies.
[0007] According to one aspect of the disclosure, a speaker box is provided. The speaker box comprises: a housing having a metal plate, with the metal plate forming a portion of an exterior surface of the housing; a back-to-back transducer housed in the housing, the back-to-back transducer comprising a magnetic circuit assembly having two main sides and a lateral side extending between the main side, the back-to-back transducer further comprises two diaphragm assemblies each located on one of the two main sides of the magnetic circuit assembly; a conductive sheet having a first sheet segment connected to the magnetic circuit assembly on the lateral side of the magnetic circuit assembly and a second sheet segment connected to the metal plate of the housing, thereby thermally and electrically connecting the magnetic circuit assembly to the metal plate of the housing.
[0008] According to one aspect of the disclosure, an electronic device is provided. The electronic device comprises a speaker box as described above.BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The present disclosure will be better understood by reference to the following drawings and description. The components shown in the drawings are not necessarily to scale, instead, emphasis should be placed upon the principles illustrated by the disclosure. Moreover, in the figures, like reference numerals designate like parts throughout the drawings.
[0010] Fig. 1 illustrates a perspective view of a speaker box according to one or more embodiments of the present disclosure;
[0011] Fig. 2A illustrates a sectional view of the speaker box of Fig. 1;
[0012] Fig. 2B is an enlarged view of a dashed area 2B of Fig. 2A;
[0013] Fig. 3A illustrates an exploded view of the speaker box of Fig. 1;
[0014] Fig. 3B illustrates another exploded view of the speaker box;
[0015] Fig. 4 illustrates a schematic sectional view of the conductive sheet according to one or more embodiments of the present disclosure.
[0016] BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0017] Hereinafter, various embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings.
[0018] As used herein, the singular forms “a” , “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprise” , “comprising” , “includes” and / or “including” , as used herein, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or combinations thereof. As used herein, the term “and / or” and the symbol “ / ” are meant to include any and all combinations of one or more of the associated listed items. Additionally, while the terms first, second etc. may be used herein to describe various elements, components, steps or calculations, these elements, components, steps, or calculations should not be limited by these terms, rather, these terms are only used to distinguish one element, component, step or calculation from another. For example, a first component may be referred to as a second component, similarly a first calculation may be referred to as a second calculation; likewise, a first step may be referred to as a second step, all without departing from the scope of this disclosure. As used herein, the term “main side” refers to the two sides of the back-to-back transducer where the diaphragms are located, the term “lateral side” refers to a side of the back-to-back transducer between the main sides.
[0019] To clarify the use in the pending claims and to hereby provide notice to the public, the phrases “at least one of , , ... and <N>” or “at least one of , , ... <N>, or combinations thereof” are defined by the Applicant in the broadest sense, superseding any other implied definitions herebefore or hereinafter unless expressly asserted by the Applicant to the contrary, to mean one or more elements selected from the group comprising A, B, ... and N, that is to say, any combination of one or more of the elements A, B, ... or N including any one element alone or in combination with one or more of the other elements which may also include, in combination, additional elements not listed.
[0020] The present disclosure provides a speaker box, comprising: a housing having a metal plate, with the metal plate forming a portion of an exterior surface of the housing; a back-to-back transducer housed in the housing, the back-to-back transducer comprising a magnetic circuit assembly having two main sides and a lateral side extending between the main sides; a conductive sheet having a first sheet segment connected to the magnetic circuit assembly on the lateral side of the magnetic circuit assembly and a second sheet segment connected to the metal plate of the housing, thereby thermally and electrically connecting the magnetic circuit assembly to the metal plate of the housing.
[0021] With this configuration, the heat generated by the back-to-back transducer can be transmitted to the metal plate which forms a portion of an exterior surface of the housing, and then dissipated via the metal plate. This ensures efficient cooling of the back-to-back transducer, which is vital for maintaining the performance and longevity of the back-to-back transducer.
[0022] In one or more embodiments, the conductive sheet comprises a conductive adhesive layer and a graphene sheet.
[0023] The graphene sheet provides excellent thermal conductivity, surpassing that of copper by several times, thereby facilitating excellent heat transfer between the back-to-back transducer and the metal plate. Additionally, the graphene sheet exhibits excellent flexibility, enabling it to withstand the high-frequency vibrations within the speaker box over long term without the risk of fracturing or failure. This is essential for ensuring that the conductive sheet remains functional over the lifespan of the speaker box, even under intense operational conditions.
[0024] In one or more embodiments, the metal plate of the housing is grounded. With this configuration, the magnetic circuit assembly of the speaker box is properly grounded. This configuration enhances the EMC performance of the speaker box and electronic device to which the speaker box is mounted.
[0025] In one or more embodiments, the magnetic circuit assembly comprises an inner magnetic circuit portion and an outer magnetic circuit portion. The inner magnetic circuit portion comprises a first inner magnet and a second inner magnet, and the outer magnetic circuit portion comprises a first outer yoke and a second outer yoke, the magnetic circuit assembly further comprises a conductive plate sandwiched between the first inner magnet and the second inner magnet, and between the first outer yoke and the second outer yoke, and thereby provides a thermal and electrical conductivity between the inner magnetic circuit portion and the outer magnetic circuit portion.
[0026] The conductive plate provides a thermal and electrical conductivity between the inner magnetic circuit portion and the outer magnetic circuit portion, thereby further ensures efficient cooling of the back-to-back transducer, especially the inner magnetic circuit portion of the magnetic circuit assembly.
[0027] Fig. 1 illustrates a perspective view of a speaker box 100 according to one or more embodiments of the present disclosure. Fig. 2A illustrates a sectional view of the speaker box 100. Fig. 2B is an enlarged view of a dashed area 2B of Fig. 2A.
[0028] As shown, the speaker box 100 comprises a housing 102 having a first housing portion 110 and a second housing portion 120. The first housing portion 110 defines a first chamber 112, which accommodates a back-to-back transducer 130 therein. The second housing portion 120 defines a second chamber 122. The back-to-back transducer 130 comprises a magnetic circuit assembly that defines two magnetic gaps 148a, 148b, each located on a respective main side of the magnetic circuit assembly.
[0029] The magnetic circuit assembly comprises a first inner magnet 132a, a second inner magnet 132b, a first inner yoke plate 134a, and a second inner yoke plate 134b. The first inner magnet 132a, the second inner magnet 132b, the first inner yoke plate 134a, and the second inner yoke plate 134b are located inner of or inside the magnetic gaps 148a, 148b, and may be collectively referred to as an inner magnetic circuit portion. The magnetic circuit assembly further comprises a first outer yoke 136a, a second outer yoke 136b, a first outer yoke plate 138a, a second outer yoke plate 138b. The first outer yoke 136a, the second outer yoke 136b, the first outer yoke plate 138a, and the second outer yoke plate 138b are located outer of or outside the magnetic gaps 148a, 148b, and may be collectively referred to as an outer magnetic circuit portion. The inner magnetic circuit portion (including the first inner magnet 132a, the second inner magnet 132b, the first inner yoke plate 134a, and the second inner yoke plate 134b) and the outer magnetic circuit portion (including the first outer yoke 136a, the second outer yoke 136b, the first outer yoke plate 138a, and the second outer yoke plate 138b) are arranged so that the magnetic flux from the first inner magnet 132a and the second inner magnet 132b are guided and / or concentrated through the two magnetic gaps 148a, 148b. As shown, each of the two magnetic gaps 148a, 148b is defined between the first inner yoke plate 134a and the first outer yoke plate 138a, or between the second inner yoke plate 134b and the second outer yoke plate 138b.
[0030] The magnetic circuit assembly further comprises a conductive plate 140. The conductive plate 140 is sandwiched between the first inner magnet 132a and the second inner magnet 132b, and between the first outer yoke 136a and the second outer yoke 136b, and thus the conductive plate 140 provides a thermal and electrical conductivity between the inner magnetic circuit portion (including first and second inner magnetics 132a, 132b) and the outer magnetic circuit portion (including the first and second metal plates 136a, 136b) . In one or more embodiments, the conductive plate 140 may be a metal plate, such as a steel plate.
[0031] The back-to-back transducer 130 further comprises two vibrating assemblies each mounted to a respective main side of the magnetic circuit assembly. Each of the two vibrating assemblies comprises a diaphragm assembly 142a, 142b, and a voice coil 144a, 144b attached to the diaphragm assembly 142a, 142b. The voice coil 144a, 144b of each vibrating assembly is suspended in a respective magnetic gap 148a, 148b of the magnetic circuit assembly. During operation, an electrical audio signal is transmitted to the voice coils 144a and 144b. The current flowing through voice coils 144a, 144b causes them to vibrate up and down in the magnetic fields or the magnetic flux of the magnetic gaps 144a and 144b, driving the diaphragm assemblies 142a, 142b to vibrate, thereby producing sound from the back-to-back transducer 130.
[0032] Additionally, the first housing portion 110 is provided with a first sound outlet 114a and a second sound outlet 114b. The first sound outlet 114a and the second sound outlet 114b are each in communication with a space in front of the respective diaphragm assemblies 142a and 142b. As a result, when the speaker 130 operates, the sound produced by the diaphragm assembly 142a is emitted through the first sound outlet 114a, and the sound produced by the diaphragm assembly 142b is emitted through the second sound outlet 114b.
[0033] The second housing portion 120 defines a second chamber 122, which communicates with the space in front of the diaphragm assemblies 142a and 142b, thereby acting as a back chamber for the back-to-back transducer 130. This second chamber 122 enhances the resonance, thereby improving the sound quality of the back-to-back transducer 130.
[0034] Figs. 2A-2B illustrate a specific structure for the back-to-back transducer 130. The present disclosure is not limited thereto and in one or more other embodiments, the back-to-back transducer 130 may have any other suitable structure. For example, the back-to-back transducer of the present disclosure may have a different shape, different number and / or shape of the magnets, different number and / or shape of yokes or yoke plates. For example, in one or more other embodiments, the elements 136a and 136b may alternatively be implemented as magnets, specifically as a first outer magnet 136a and a second outer magnet 136b. In this way, the magnetic circuit assembly is arranged to guide and / or concentrate the magnetic flux from the first inner magnet 132a, the second inner magnet 132b, the first outer magnet 136a, and the second outer magnet 136b through the magnetic gaps 148a, 148b.
[0035] Fig. 1 and Figs. 2A-2B illustrate a specific structure for the housing 102 of the speaker box 100. The present disclosure is not limited thereto, and in one or more other embodiments, the housing 102 may have any other suitable structure. For example, in one or more embodiments, the housing 102 may have only one housing portion defining a chamber, which accommodates a back-to-back transducer therein, and may not have a second housing portion defining a second chamber which acts as a back chamber of the speaker box.
[0036] In the first housing portion 110, metal plates 116 and 118 are provided opposing or facing the main sides of the back-to-back transducer 130. According to one or more embodiments of the present disclosure, the housing 102 of the speaker box 100 is formed by injection molding, with the metal plate 118 integrated therein by means of insert molding. The metal plates 116 and 118 are thin, which effectively reduces the overall thickness of the speaker box 100. This reduced overall thickness of the speaker box is particularly vital for mobile phones and portable electronic devices, where slim profiles are desirable.
[0037] The speaker box 100 further comprises a thermally and electrically conductive sheet 150. The thermally and electrically conductive sheet 150 comprises a first sheet segment 152, a second sheet segment 156, and a third sheet segment 154. The first sheet segment 152 of the conductive sheet 150 is attached to a lateral side of the back-to-back transducer 130, and in a direct contact with the first outer yoke 136a, the second outer yoke 136b, and the conductive plate 140, providing both thermal and electrical connection with the first outer yoke 136a, the second outer yoke 136b, and the conductive plate 140. The second sheet segment 156 is attached to the metal plate 118, and in a direct contact with the metal plate 118, providing both thermal and electrical connection with the metal plate 118. The third sheet segment 154 is angled or inclined to bridge between the first sheet segment 152 and the second sheet segment 156. This configuration allows the conductive sheet 150 to achieve both thermal and electrical connectivity between the back-to-back transducer 130 and the metal plate 118, specifically between the inner and outer magnetic circuit portions and the metal plate 118. In one or more embodiments, the metal plate 118 forms a portion of an exterior surface of the housing 102. This allows the heat generated by the back-to-back transducer 130 to be transmitted to the metal plate 118, and then dissipated. In one or more other embodiments, the metal plate 118 may be thermally coupled to a heat sink to further enhance the heat dissipation.
[0038] Additionally, the angled arrangement of the third sheet segment 154 is particularly designed to accommodate relative vibrations between the first sheet segment 152 and the second sheet segment 156, thereby effectively accommodating vibrations of the speaker box 100 during operation over long term without the risk of fracturing or failure.
[0039] In the embodiment shown, the metal plate 118 extends into the second housing portion 120 and constitutes a portion of the second housing portion 120. The first sheet segment 152 of the conductive sheet 150 is attached to the lateral side of the back-to-back transducer 130 that is adjacent to the second chamber 122. The third sheet segment 154 and the second sheet segment 156 substantially extend in the second chamber 122. This configuration effectively utilizes the volume of the second chamber 122, which acts as a back chamber or a resonance chamber. It accommodates relatively large areas of the second and third sheet segments 154 and 156 without increasing the overall volume of the speaker box 100. The enlarged area of third sheet segment 154 enhances its ability to accommodate the vibrations of the speaker box 100 during operation, ensuring more stable performance of the speaker box 100. The increased surface area of the second sheet segment 156 ensures good thermal and electrical connectivity between the conductive sheet 150 and the metal plate 118, and thereby good thermal and electrical connectivity between the back-to-back transducer 130 and the metal plate 118.
[0040] Fig. 3A illustrates an exploded view of the speaker box 100, Fig. 3B illustrates another exploded view of the speaker box 100. Fig. 4 illustrates a schematic sectional view of the conductive sheet 150 according to one or more embodiments of the present disclosure.
[0041] The housing 102 comprises a lower half 102a and an upper half 102b. The upper half 102b and the lower half 102a of the housing 102 are mated together to form the housing 102, which defines the first chamber 112 and the second chamber 122. In one or more embodiments, the metal plate 116 may be connected to the upper half 102b. For example, the metal plate 116 may be connected to the upper half 102b by using an adhesive. The metal plate 118 may be integrally molded with the lower half 102a by an insert molding.
[0042] In the embodiment shown in Fig. 3B and Fig. 4, the thermally and electrically conductive sheet 150 comprises a conductive adhesive layer 150a and a graphene sheet 150b. In one or more embodiments, the graphene sheet 150b is constructed by laminating multiple layers of graphene, which are pressed together and are bonded together through van der Waals forces. The graphene sheet 150b provides excellent thermal conductivity, surpassing that of copper by several times, thereby facilitating excellent heat transfer between the back-to-back transducer 130 and the metal plate 118. This ensures efficient cooling of the back-to-back transducer 130, which is vital for maintaining the performance and longevity of the back-to-back transducer 130. In one or more other embodiments, the thermally and electrically conductive sheet 150 may comprise a conductive adhesive layer and a graphite sheet.
[0043] Additionally, the graphene sheet 150b exhibits excellent flexibility, enabling it to withstand the high-frequency vibrations within the speaker box in long term without the risk of fracturing or failure. This is essential for ensuring that the conductive sheet 150 remains functional over the lifespan of the speaker box 100, even under intense operational conditions.
[0044] The combination of the conductive adhesive layer 150a and the graphene sheet 150b allows for a snug fit of the graphene sheet 150b with the back-to-back transducer 130 and with the metal plate 118, ensuring firm electrical and thermal connections between the back-to-back transducer 130 and the metal plate 118.
[0045] In one or more embodiments of the present disclosure, the metal plate 118 is grounded, so that the speaker box 100 is also properly grounded. This configuration enhances the EMC performance of the speaker box 100 and the electronic device to which the speaker box is mounted.
[0046] According to one or more embodiments of the disclosure, the present disclosure can be implemented as follows.
[0047] Item 1: A speaker box, comprising: a housing having a metal plate, with the metal plate forming a portion of an exterior surface of the housing; a back-to-back transducer housed in the housing, the back-to-back transducer comprising a magnetic circuit assembly having two main sides and a lateral side extending between the main side, the back-to-back transducer further comprises two diaphragm assemblies each located on one of the two main sides of the magnetic circuit assembly; a conductive sheet having a first sheet segment connected to the magnetic circuit assembly on the lateral side of the magnetic circuit assembly and a second sheet segment connected to the metal plate of the housing, thereby thermally and electrically connecting the magnetic circuit assembly to the metal plate of the housing.
[0048] Item 2: The speaker box according to Item 1, wherein the conductive sheet comprises a conductive adhesive layer and a graphene sheet.
[0049] Item 3: The speaker box according to any one of Items 1-2, wherein the metal plate of the housing is grounded.
[0050] Item 4: The speaker box according to any one of Items 1-3, wherein the metal plate is integrally molded with the housing by an insert molding process.
[0051] Item 5: The speaker box according to any one of Items 1-4, wherein the conductive sheet further comprises a third sheet segment, which is angled or inclined to bridge between the first sheet segment and the second sheet segment.
[0052] Item 6: The speaker box according to any one of Items 1-5, wherein the third sheet segment has a width less than that of the first sheet segment and the second sheet segment.
[0053] Item 7: The speaker box according to any one of Items 1-6, wherein the magnetic circuit assembly defines two magnetic gaps each located on a main side of the magnetic circuit assembly, the magnetic circuit assembly further comprises an inner magnetic circuit portion located inner of the magnetic gaps and an outer magnetic circuit portion located outer of the magnetic gaps, wherein the first sheet segment of the conductive sheet is connected to the outer magnetic circuit portion on the lateral side of the magnetic circuit assembly.
[0054] Item 8: The speaker box according to any one of Items 1-7, wherein the inner magnetic circuit portion comprises a first inner magnet and a second inner magnet, and the outer magnetic circuit portion comprises a first outer yoke and a second outer yoke, the magnetic circuit assembly further comprises a conductive plate sandwiched between the first inner magnet and the second inner magnet, and between the first outer yoke and the second outer yoke, and thereby provides a thermal and electrical conductivity between the inner magnetic circuit portion and the outer magnetic circuit portion.
[0055] Item 9: The speaker box according to any one of Items 1-8, wherein the conductive sheet is directly in contact with each of the first outer yoke, the conductive plate, and a second outer yoke.
[0056] Item 10: The speaker box according to any one of Items 1-9, wherein the housing defines a first chamber for accommodating the back-to-back transducer and a second chamber acting as a back chamber of the back-to-back transducer, the lateral side of the back-to-back transducer is adjacent to the second chamber, and the second sheet segment of the conductive sheet extends in the second chamber.
[0057] Item 11: An electronic device, comprising a speaker box according to any one of Items 1-10.
[0058] Item 12: The electronic device according to Item 11, wherein the electronic device is a portable electronic device.
[0059] Systems and methods have been described in general terms as an aid to understanding details of the disclosure. In some instances, well-known structures, materials, and / or operations have not been specifically shown or described in detail to prevent obscuring aspects of the disclosure. In other instances, specific details have been given to provide a thorough understanding of the disclosure. One skilled in the relevant art will recognize that the disclosure may be embodied in other specific forms, for example to adapt to a particular system or apparatus or situation or material or component, without departing from the spirit or essential characteristics thereof. Therefore, the disclosures and descriptions herein are intended to be illustrative, but not limiting, of the scope of the disclosure. Accordingly, the disclosure is not to be restricted except considering the attached claims and their equivalents.
Claims
1.A speaker box, comprising:a housing having a metal plate, with the metal plate forming a portion of an exterior surface of the housing;a back-to-back transducer housed in the housing, the back-to-back transducer comprising a magnetic circuit assembly having two main sides and a lateral side extending between the main sides, the back-to-back transducer further comprises two diaphragm assemblies each located on one of the two main sides of the magnetic circuit assembly;a conductive sheet having a first sheet segment connected to the magnetic circuit assembly on the lateral side of the magnetic circuit assembly and a second sheet segment connected to the metal plate of the housing, thereby thermally and electrically connecting the magnetic circuit assembly to the metal plate of the housing.2.The speaker box according to claim 1, wherein the conductive sheet comprises a conductive adhesive layer and a graphene sheet.3.The speaker box according to claim 1, wherein the metal plate of the housing is grounded.4.The speaker box according to claim 1, wherein the metal plate is integrally molded with the housing by an insert molding process.5.The speaker box according to claim 1, wherein the conductive sheet further comprises a third sheet segment, which is angled or inclined to bridge between the first sheet segment and the second sheet segment.6.The speaker box according to claim 5, wherein the third sheet segment has a width less than that of the first sheet segment and the second sheet segment.7.The speaker box according to any one of claims 1-6, wherein the magnetic circuit assembly defines two magnetic gaps each located on a main side of the magnetic circuit assembly, the magnetic circuit assembly further comprises an inner magnetic circuit portion located inner of the magnetic gaps and an outer magnetic circuit portion located outer of the magnetic gaps, wherein the first sheet segment of the conductive sheet is connected to the outer magnetic circuit portion on the lateral side of the magnetic circuit assembly.8.The speaker box according to claim 7, wherein the inner magnetic circuit portion comprises a first inner magnet and a second inner magnet, and the outer magnetic circuit portion comprises a first outer yoke and a second outer yoke, the magnetic circuit assembly further comprises a conductive plate sandwiched between the first inner magnet and the second inner magnet, and between the first outer yoke and the second outer yoke, and thereby provides a thermal and electrical conductivity between the inner magnetic circuit portion and the outer magnetic circuit portion.9.The speaker box according to claim 8, wherein the conductive sheet is directly in contact with each of the first outer yoke, the conductive plate, and a second outer yoke.10.The speaker box according to any one of claims 1-6, wherein the housing defines a first chamber for accommodating the back-to-back transducer and a second chamber acting as a back chamber of the back-to-back transducer, the lateral side of the back-to-back transducer is adjacent to the second chamber, and the second sheet segment of the conductive sheet extends in the second chamber.11.An electronic device, comprising a speaker box according to any one of claims 1-10.12.The electronic device according to claim 11, wherein the electronic device is a portable electronic device.
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