Electronic device

Abstract

The application discloses an electronic device, comprising a sound emitting unit and a shell, the sound emitting unit comprising a first sound emitting unit, a second sound emitting unit and a third sound emitting unit arranged integrally, the second sound emitting unit and the first sound emitting unit being arranged back to back; the first sound emitting unit comprising a first diaphragm assembly vibrating along a first direction, the second sound emitting unit comprising a second diaphragm assembly vibrating along the first direction, and the sound emitting area of the first diaphragm assembly being greater than the sound emitting area of the second diaphragm assembly; the third sound emitting unit comprising a third diaphragm assembly vibrating along a second direction, the second direction being arranged at an angle to the first direction, the third sound emitting unit being a high-pitched sound emitting unit, and the working frequency band of the third sound emitting unit being greater than 2000 Hz; the sound emitting unit being accommodated in the shell, the shell being provided with a first sound hole communicating with the first sound emitting unit, a second sound hole communicating with the second sound emitting unit and a third sound hole communicating with the third sound emitting unit. The electronic device has the advantages of good call privacy and good tone color.

Description

Technical Field

[0001] This invention relates to the field of electroacoustic technology, and in particular to an electronic device. Background Technology

[0002] With the rapid development of the consumer electronics industry, consumers have a strong demand for various electronic devices. For smart mobile terminals and other electronic devices, consumers are also demanding higher and higher audio-visual experiences. For example, foldable screen phones, as smart mobile terminals, can provide a larger display screen, satisfying people's visual pursuits, while they also expect terminal devices to provide a rich audio experience.

[0003] Consumers demand privacy protection features for electronic devices during calls. Although the acoustic dipole design for speakers is now widely used in smart mobile terminals, improving call privacy, even with the acoustic dipole design, the far-field cancellation bandwidth of sound is only up to 2000Hz, limiting the mid-to-high frequency cancellation effect and still affecting call privacy.

[0004] Furthermore, when the speaker is operating, the front cavity uses a low-pass filter. When the driving signal frequency exceeds the front cavity resonant frequency Fh, the speaker loudness drops significantly. Currently, the front cavity resonant point of speaker modules in smart mobile terminals is typically less than 6000Hz, resulting in a narrower effective frequency band and poorer sound quality. Summary of the Invention

[0005] The main objective of this invention is to propose an electronic device that addresses the problems in existing electronic devices, such as limited high-frequency cancellation effects, impacting call privacy, narrowing effective bandwidth, and poor sound quality.

[0006] To achieve the above objectives, the present invention provides an electronic device comprising: A sound-emitting unit, comprising a first sound-emitting unit, a second sound-emitting unit, and a third sound-emitting unit, wherein the second sound-emitting unit and the first sound-emitting unit are arranged back-to-back; the first sound-emitting unit includes a first diaphragm assembly vibrating along a first direction, the second sound-emitting unit includes a second diaphragm assembly vibrating along the first direction, and the sound-emitting area of ​​the first diaphragm assembly is larger than the sound-emitting area of ​​the second diaphragm assembly; the third sound-emitting unit includes a third diaphragm assembly vibrating along a second direction, the second direction being arranged at an angle to the first direction, the third sound-emitting unit being a high-frequency sound-emitting unit, and the operating frequency band of the third sound-emitting unit being greater than 2000Hz; The outer shell houses the sound-emitting unit. The outer shell has a first set of sound holes, which includes a first sound hole communicating with the first sound-emitting unit, a second sound hole communicating with the second sound-emitting unit, and a third sound hole communicating with the third sound-emitting unit.

[0007] Optionally, the first diaphragm assembly and the second diaphragm assembly are respectively disposed on both sides of the sound-generating unit along the first direction. The sound-generating unit further includes a magnetic circuit assembly, which is located between the first diaphragm assembly and the second diaphragm assembly. The first sound-generating unit includes a first voice coil, and the second sound-generating unit includes a second voice coil. The magnetic circuit assembly is provided with a first magnetic gap and a second magnetic gap. One end of the first voice coil is connected to the first diaphragm assembly, and the other end of the first voice coil is inserted into the first magnetic gap. One end of the second voice coil is connected to the second diaphragm assembly, and the other end of the second voice coil is inserted into the second magnetic gap.

[0008] Optionally, the magnetic circuit assembly includes: The first side magnet; A ring magnet, wherein the first side magnet is located outside the ring magnet and forms the first magnetic gap with the ring magnet; A central magnet, wherein the ring magnet surrounds the outer periphery of the central magnet and forms a second magnetic gap between the ring magnet and the central magnet.

[0009] Optionally, the third sound-generating unit includes a third side magnet, and a third magnetic gap is formed between the third side magnet and the first side magnet. The third sound-generating unit includes a third voice coil, one end of which is connected to the third diaphragm assembly, and the other end of which is inserted into the third magnetic gap.

[0010] Optionally, the third voice coil is a flat voice coil, and the axis of the flat voice coil is aligned with the first direction.

[0011] Optionally, the third voice coil has two extended sides spaced apart along the second direction, each extended side extending along a third direction, the third direction being perpendicular to the first direction and the second direction respectively, one of the extended sides being connected to the third diaphragm assembly and located outside the third magnetic gap, and the other extended side being inserted into the third magnetic gap.

[0012] Optionally, the sound-generating unit further includes a magnetic yoke and a magnetic plate spaced apart along the first direction. The magnetic circuit assembly is located between the magnetic yoke and the magnetic plate. The magnetic yoke includes a body portion and a bent extension portion. The magnetic circuit assembly is disposed on the body portion. The bent extension portion is disposed at one end of the body portion and bends away from the magnetic circuit assembly. The bent extension portion cooperates with the first side magnet to define a mounting groove. The third side magnet is located in the mounting groove and is spaced apart from the first side magnet to form the third magnetic gap.

[0013] Optionally, the magnetic guide plate includes a side magnetic guide plate and a center magnetic guide plate, the side of the first side magnet away from the magnetic guide yoke is connected to the side magnetic guide plate, and the sides of the ring magnet and the center magnet away from the magnetic guide yoke are both connected to the center magnetic guide plate.

[0014] Optionally, the sound-generating unit further includes a magnetic yoke and a magnetic plate spaced apart along the first direction, the magnetic circuit assembly is located between the magnetic yoke and the magnetic plate, the third sound-generating unit includes a central magnet, the magnetic yoke and the magnetic plate are respectively disposed on both sides of the central magnet and each forms a third magnetic gap with the central magnet, the third sound-generating unit includes a third voice coil, one end of the third voice coil is connected to the third diaphragm assembly, and the other end of the third voice coil is inserted into the third magnetic gap.

[0015] Optionally, the voice coil of the third sound-generating unit is a cylindrical voice coil, and the axis of the cylindrical voice coil is aligned with the second direction.

[0016] Optionally, the first sound-emitting unit has a first rear cavity, the second sound-emitting unit has a second rear cavity, and the third sound-emitting unit has a third rear cavity; The first rear cavity is connected to the third rear cavity and the first rear cavity is isolated from the second rear cavity; or, the first rear cavity, the second rear cavity and the third rear cavity are connected to each other; or, the first rear cavity, the second rear cavity and the third rear cavity are isolated from each other.

[0017] Optionally, the outer edge of the housing forms a middle frame, the side of the housing is equipped with a screen and a back cover, and mounting edges are formed on the housing at positions between the top of the middle frame and the top of the screen and / or between the top of the middle frame and the top of the back cover. The first sound hole is located at the top of the middle frame, the second sound hole is located close to the first sound hole and at the mounting edge, and the third sound hole is located at the top of the middle frame or the mounting edge.

[0018] Optionally, the housing includes two rectangular folding shells that can be folded or unfolded along their long sides, wherein the screen is mounted on both opposite sides of one of the folding shells, and the screen and the back cover are mounted on opposite sides of the other folding shell, respectively. The sound-emitting unit is housed within one of the folding shells, and the first sound hole is located at the top of the middle frame corresponding to the folding shell, the second sound hole is located at the mounting edge corresponding to the folding shell, and the third sound hole is located at the top of the middle frame or the mounting edge corresponding to the folding shell.

[0019] Optionally, there are multiple sound-emitting units, which are disposed in two folded shells. The multiple sound-emitting units located in the same folded shell are arranged side by side along the width direction of the folded shell and share the first sound hole group.

[0020] Optionally, when the two folding shells are folded, the first acoustic hole group located on one of the folding shells is either directly opposite to or offset from the first acoustic hole group located on the other folding shell.

[0021] Optionally, the electronic device further includes a dual-sided sound-emitting unit housed within another folding shell. The dual-sided sound-emitting unit includes a fourth sound-emitting unit and a fifth sound-emitting unit arranged back-to-back. The folding shell has a second set of sound holes, which includes a fourth sound hole communicating with the fourth sound-emitting unit and a fifth sound hole communicating with the fifth sound unit. The fourth sound hole is located at the top of the middle frame corresponding to the folding shell, and the fifth sound hole is located on the mounting edge of the folding shell near the fourth sound hole.

[0022] Optionally, when the two folding shells are folded, the first acoustic hole group and the second acoustic hole group are arranged facing each other or staggered.

[0023] Optionally, there are multiple dual-sided sound generating units, which are disposed in two folded shells. Multiple dual-sided sound generating units located in the same folded shell are arranged side by side along the width direction of the folded shell and share the second sound hole group.

[0024] Optionally, the outer shell is a rectangular shell, the screen and the back cover are respectively installed on opposite sides of the outer shell, and the number of the sound-emitting units is one or more; when the number of sound-emitting units is multiple, the multiple sound-emitting units are arranged side by side along the width direction of the outer shell, and the multiple sound-emitting units share the first sound hole group, or the outer shell has a first sound hole group for each of the sound-emitting units.

[0025] The electronic device of this invention incorporates a sound-emitting unit, comprising a first sound-emitting unit, a second sound-emitting unit, and a tweeter sound-emitting unit. The first and second sound-emitting units are arranged back-to-back, with the first diaphragm assembly of the first sound-emitting unit and the second diaphragm assembly of the second sound-emitting unit both vibrating along a first direction, and the third diaphragm assembly of the tweeter sound-emitting unit vibrating along a second direction. The first and second directions are arranged at an angle, and the tweeter sound-emitting unit operates at a frequency greater than 2000Hz. The outer casing has a first sound hole, a second sound hole, and a third sound hole, through which the first, second, and tweeter sound-emitting units emit sound. This not only cancels the superimposed sound field beyond 2000 Hz in the far field of the electronic device, improving the mid-to-high frequency cancellation effect and allowing the far-field cancellation bandwidth to exceed 2000 Hz, thus widening the sound cancellation frequency band and significantly reducing mid-to-high frequency sound leakage, further enhancing call privacy, but also effectively widens the frequency band of the electronic device and improves the timbre. Attached Figure Description

[0026] 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.

[0027] Figure 1 This is a schematic diagram of the assembly of a sound-generating unit in an electronic device according to an embodiment of the present invention; Figure 2 This is an exploded view of a sound-generating unit in an electronic device according to an embodiment of the present invention; Figure 3 This is a cross-sectional schematic diagram of a sound-emitting unit in an electronic device according to an embodiment of the present invention; Figure 4 This is a cross-sectional schematic diagram of a sound-emitting unit in an electronic device according to another embodiment of the present invention; Figure 5 This is a plan view of a sound-generating module in an electronic device according to an embodiment of the present invention; Figure 6 for Figure 5 Schematic diagram of the BB section; Figure 7 for Figure 5 Schematic diagram of section AA; Figure 8 This is a partial structural schematic diagram of the electronic device of the present invention; Figure 9 As an example Figure 8 Schematic diagram of the DD section; Figure 10 As an example Figure 8 Schematic diagram of the C-section; Figure 11 As another embodiment Figure 8 Schematic diagram of the DD section; Figure 12 As another embodiment Figure 8 Schematic diagram of the DD section; Figure 13 Another embodiment Figure 8 Schematic diagram of the DD section; Figure 14 Another embodiment Figure 8 Schematic diagram of the DD section; Figure 15 This is a three-dimensional structural diagram of the two folding shells of an electronic device according to an embodiment of the present invention when folded. Figure 16 This is a three-dimensional structural diagram of an electronic device according to an embodiment of the present invention when the two folding shells are unfolded; Figure 17 (1) is a three-dimensional structural diagram of the first sound-generating component on one of the folded shells in an electronic device according to an embodiment of the present invention, and (2) is a three-dimensional structural diagram of the first sound-generating component on another folded shell; Figure 18 (3) is a three-dimensional structural diagram of an electronic device according to an embodiment of the present invention, in which both folded shells contain a sound-emitting unit, and (4) is a three-dimensional structural diagram from another perspective. Figure 19 (5) is a three-dimensional structural diagram of an electronic device according to another embodiment of the present invention, in which both folded shells contain a sound-emitting unit, and (6) is a three-dimensional structural diagram from another perspective. Figure 20 (7) is a three-dimensional structural diagram of an electronic device according to an embodiment of the present invention, in which the two folded shells respectively house a sound-emitting unit and a double-sided sound-emitting unit, and (8) is a three-dimensional structural diagram from another perspective. Figure 21 This is a schematic planar structure diagram of one of the folded shells housing a dual-sided sound-emitting unit in an electronic device according to an embodiment of the present invention. Figure 22 for Figure 21 Schematic diagram of the EE section; Figure 23 This is a schematic diagram of the structure of a dual-sided sound-emitting unit in an electronic device according to an embodiment of the present invention; Figure 24 This is a three-dimensional structural diagram of an electronic device according to other embodiments of the present invention; Figure 25 A three-dimensional structural diagram of an electronic device housing two sound-emitting units, as shown in another embodiment of the present invention; Figure 26 This is a three-dimensional structural diagram of the two folding shells of an electronic device according to another embodiment of the present invention when folded.

[0028] Explanation of icon numbers: 100. Sound-producing unit; 10. First sound-producing unit; 10a. SPK unit; 11. First diaphragm assembly; 111. First diaphragm; 112. First diaphragm plate; 12. First voice coil; 13. First housing; 14. First front cavity; 15. First rear cavity; 20. Second sound-producing unit; 20a. RCV unit; 21. Second diaphragm assembly; 211. Second diaphragm; 212. Second diaphragm plate; 22. Second voice coil; 23. Second housing; 24. Second front cavity; 25. Second rear cavity; 26. Front cover; 30. Three sound-producing units; 30a, tweeter unit; 31, third diaphragm assembly; 311, third diaphragm; 312, third diaphragm plate; 32, third voice coil; 321, extension edge; 33, third side magnet; 34, third magnetic gap; 35, central magnet; 36, third housing; 37, third front cavity; 38, third rear cavity; 39, central magnetic guide plate; 40, first magnetic circuit assembly; 41, first magnetic gap; 42, second magnetic gap; 43, first side magnet; 44, ring magnet; 45, central magnet; 46, auxiliary magnetic guide plate; 5 0. Magnetic yoke; 51. Body; 52. Bending extension; 53. Mounting slot; 60. Magnetic plate; 61. Side magnetic plate; 62. Center magnetic plate; 70. FPCB; 80. Steel mesh; 90. Centering support; 200. Sound module; 201. Protective shell; 202. First sound outlet channel; 203. Third sound outlet channel; 300. Electronic device; 301. First sound hole; 302. Second sound hole; 303. Third sound hole; 304. Outer shell; 305. Folding shell; 306. Screen; 306a. Main screen; 30 6b. Sub-screen; 3061. First screen; 3062. Second screen; 307. Back cover; 308. Mid-frame; 309. Mounting edge; 400. Dual-sided sound unit; 401. Fourth sound unit; 4011. Fourth diaphragm assembly; 4012. Fourth voice coil; 402. Fifth sound unit; 4021. Fifth diaphragm assembly; 4022. Fifth voice coil; 403. Second magnetic circuit assembly; 4031. Fourth magnetic gap; 4032. Fifth magnetic gap; 404. Fourth sound hole; 405. Fifth sound hole; 406. Sound-emitting surface.

[0029] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0032] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0033] like Figures 1 to 26 As shown, the present invention proposes an electronic device 300, which includes a sound-emitting unit 100 and a housing 304. The sound-emitting unit 100 includes a first sound-emitting unit 10, a second sound-emitting unit 20, and a third sound-emitting unit 30, with the second sound-emitting unit 20 and the first sound-emitting unit 10 arranged back-to-back. The first sound-emitting unit 10 includes a first diaphragm assembly 11 that vibrates along a first direction, and the second sound-emitting unit 20 includes a second diaphragm assembly 21 that vibrates along the first direction. The sound-emitting area of ​​the first diaphragm assembly 11 is larger than the sound-emitting surface of the second diaphragm assembly 21. The third sound-emitting unit 30 includes a third diaphragm assembly 31 that vibrates along a second direction, which is angled with the first direction. The third sound-emitting unit 30 is a tweeter 30a, and its operating frequency band is greater than 2000Hz. The sound-emitting unit 100 is housed within a housing 304, which has a first set of sound holes. The first set of sound holes includes a first sound hole 301 communicating with the first sound-emitting unit 10, a second sound hole 302 communicating with the second sound unit 20, and a third sound hole 303 communicating with the third sound unit 30. Optionally, the first sound-emitting unit 10, the second sound unit 20, and the third sound unit 30 can be integrally arranged, thereby improving the structural integration of the sound-emitting unit 100 and increasing assembly efficiency.

[0034] The electronic device 300 of this invention can be a mobile phone, tablet, or computer, etc., and the mobile phone can be a flat-screen phone or a foldable-screen phone. In this embodiment, the electronic device 300 is described using a mobile phone as an example. The sound-emitting unit 100 of the electronic device 300 of this invention can be a speaker unit, and the sound-emitting unit 100 can be applied in the sound-emitting module 200 of the electronic device 300. In this embodiment, the sound-emitting unit 100 is described using a speaker unit as an example.

[0035] In one embodiment, the first sound-emitting unit 10 is a loudspeaker unit, hereinafter referred to as SPK unit 10a, and the second sound-emitting unit 20 is a receiver unit, hereinafter referred to as RCV unit 20a. The first diaphragm assembly 11 of SPK unit 10a and the second diaphragm assembly 21 of RCV unit 20a both vibrate and emit sound along a first direction. The first diaphragm assembly 11 has a larger sound-emitting area, while the second diaphragm assembly 21 has a smaller sound-emitting area, so as to meet the sound emission requirements of SPK unit 10a and RCV unit 20a respectively. The housing 304 has a first sound hole group, which includes a first sound hole 301, a second sound hole 302, and a third sound hole 303. The first sound-emitting unit 10 emits sound through the first sound hole 301, the second sound unit 20 emits sound through the second sound hole 302, and the third sound unit 30 emits sound through the third sound hole 303.

[0036] like Figures 1 to 4 As shown, the SPK unit 10a and the RCV unit 20a are arranged back-to-back. Specifically, the RCV unit 20a is located in front of the SPK unit 10a. The first diaphragm assembly 11 of the SPK unit 10a and the second diaphragm assembly 21 of the RCV unit 20a both vibrate along a first direction, while the third diaphragm assembly 31 of the tweeter unit 30a vibrates along a second direction. The second direction is arranged at an angle to the first direction. In one embodiment, the first direction is... Figure 1 and Figure 2 The front and back directions are shown, and the second direction is... Figure 1 and Figure 2 The vertical direction shown is perpendicular to the first direction and the second direction. In other embodiments, the first direction and the second direction are not the same, that is, they are set at an angle. This embodiment is illustrated by taking the first direction as the front-back direction and the second direction as the vertical direction.

[0037] The electronic device 300 of the present invention has two operating modes: speaker mode (SPK mode) and receiver mode (RCV mode).

[0038] When a phone call needs to be answered, the electronic device 300 can be in RCV mode. The SPK unit 10a and RCV unit 20a vibrate in the same direction, generating sound waves with the same amplitude but opposite phase, forming a dipole effect and enhancing call privacy. Furthermore, the tweeter unit 30a operates in a frequency band greater than 2000Hz, which can cancel the superimposed sound field beyond 2000Hz in the far field of the tweeter, improving the mid-to-high frequency cancellation effect. This allows the far-field cancellation bandwidth to be greater than 2000Hz, widening the sound cancellation band and significantly reducing mid-to-high frequency sound leakage, further enhancing call privacy. It should be noted that the superimposed sound field referred to in this invention includes both reinforced and canceled sound fields.

[0039] When external sound is required, the electronic device 300 can be in SPK mode, with only the SPK unit 10a and the tweeter unit 30a working. The SPK unit 10a acts as a bass driver and works in crossover with the tweeter unit 30a, effectively widening the frequency band of the driver unit 100 and improving the timbre.

[0040] The present invention uses a single-unit speaker 100 in a sound-generating module 200. The sound-generating module 200 employs frequency division, with the division point set after the resonant frequency Fh of the front cavity of the SPK unit 10a. Furthermore, the division point frequency cannot be the resonant frequency F0 of the tweeter unit 30a; that is, the division point frequency is greater than Fh but not equal to F0. When the driving frequency is less than or equal to the division point frequency, the SPK unit 10a operates; when the driving frequency is greater than the division point frequency, the tweeter unit 30a operates. In other words, after the transient signal is framed, low-frequency signals below the division point frequency are reproduced as bass, and high-frequency signals above the division point frequency are reproduced as treble. Although the SPK unit 10a and the tweeter unit 30a are frequency-divided in the frequency domain, because the reproduced frame contains both low-frequency and high-frequency signals, the SPK unit 10a and the tweeter unit 30a work together in the time domain.

[0041] Understandably, the front cavity resonant frequency Fh can be 6000 Hz, and the crossover frequency is greater than 6000 Hz. When the driving frequency is greater than the crossover frequency, the tweeter unit 30a works without reducing the loudness of the tweeter unit 100.

[0042] If the upper limit frequency of the cancellation of the tweeter unit 30a is set to Fc, that is, the cancellation frequency of the tweeter unit 30a is 2000Hz~Fc, then it is necessary to ensure that the resonant frequency F0 of the tweeter unit 30a is less than 2000 Hz, or F0>Fc.

[0043] The electronic device 300 of the present invention comprises a sound-emitting unit 100, which includes an integrally formed first sound-emitting unit 10, a second sound-emitting unit 20, and a tweeter sound-emitting unit 30a. The first sound-emitting unit 10 and the second sound-emitting unit 20 are arranged back-to-back, and the first diaphragm assembly 11 of the first sound-emitting unit 10 and the second diaphragm assembly 21 of the second sound-emitting unit 20 both vibrate along a first direction, while the third diaphragm assembly 31 of the tweeter sound-emitting unit 30a vibrates along a second direction. The first direction and the second direction are arranged at an angle, and the operating frequency band of the tweeter sound-emitting unit 30a is greater than 2000Hz. The outer casing 304 has a first sound hole 301, a second sound hole 302, and a third sound hole 303. The first sound-emitting unit 10, the second sound-emitting unit 20, and the tweeter sound-emitting unit 30a can emit sound through the first sound hole 301, the second sound hole 302, and the third sound hole 303, respectively. This not only cancels the far-field 2000Hz of the electronic device 300, but also... The superimposed sound field below Hz improves the mid-to-high frequency cancellation effect, making the far-field cancellation bandwidth of the sound greater than 2000 Hz, widening the sound cancellation frequency band, thereby significantly reducing mid-to-high frequency sound leakage, further improving the privacy of calls, and can also effectively widen the frequency band of electronic devices by 300, improving the timbre.

[0044] In one embodiment, the first diaphragm assembly 11 and the second diaphragm assembly 21 are respectively disposed on both sides of the sound-generating unit 100 along the first direction. The sound-generating unit 100 also includes a first magnetic circuit assembly 40, which is located between the first diaphragm assembly 11 and the second diaphragm assembly 21. The first sound-generating unit 10 includes a first voice coil 12, and the second sound-generating unit 20 includes a second voice coil 22. The first magnetic circuit assembly 40 is provided with a first magnetic gap 41 and a second magnetic gap 42. One end of the first voice coil 12 is connected to the first diaphragm assembly 11, and the other end of the first voice coil 12 is inserted into the first magnetic gap 41. One end of the second voice coil 22 is connected to the second diaphragm assembly 21, and the other end of the second voice coil 22 is inserted into the second magnetic gap 42.

[0045] like Figures 1 to 4 As shown, the first diaphragm assembly 11 is disposed at the rear of the sound-generating unit 100, the second diaphragm assembly 21 is disposed at the front of the sound-generating unit 100, and the first magnetic circuit assembly 40 is located between the first diaphragm assembly 11 and the second diaphragm assembly 21. The first magnetic circuit assembly 40 has a first magnetic gap 41 for inserting the front end of the first voice coil 12, enabling the first voice coil 12 and the first diaphragm assembly 11 to vibrate back and forth. The first magnetic circuit assembly 40 also has a second magnetic gap 42 for inserting the rear end of the second voice coil 22, enabling the second voice coil 22 and the second diaphragm assembly 21 to vibrate back and forth. In this embodiment, the first magnetic circuit assembly 40 of the sound-generating unit 100 combines the first magnetic gap 41 and the second magnetic gap 42, allowing the first sound-generating unit 10 and the second sound-generating unit 20 to share the first magnetic circuit assembly 40, simplifying the structure of the first magnetic circuit assembly 40 and making it more compact.

[0046] In one embodiment, the first magnetic circuit assembly 40 includes a first side magnet 43, a ring magnet 44, and a central magnet 45. The first side magnet 43 is located outside the ring magnet 44 and forms a first magnetic gap 41 between the ring magnet 44 and the ring magnet 44. The ring magnet 44 surrounds the outer periphery of the central magnet 45 and forms a second magnetic gap 42 between the ring magnet 44 and the central magnet 45. By arranging the first side magnet 43, the ring magnet 44, and the central magnet 45, the first magnetic circuit assembly 40 combines the first magnetic gap 41 and the second magnetic gap 42, resulting in a reasonable and simple structural arrangement.

[0047] Furthermore, the third sound-generating unit 30 includes a third side magnet 33, with a third magnetic gap 34 formed between the third side magnet 33 and the first side magnet 43. The third sound-generating unit 30 also includes a third voice coil 32, with one end (upper end) of the third voice coil 32 connected to the third diaphragm assembly 31, and the other end (lower end) inserted into the third magnetic gap 34, enabling the third voice coil 32 and the third diaphragm assembly 31 to vibrate vertically. The first side magnet 43 can cooperate with the ring magnet 44 to form the first magnetic gap 41, or it can cooperate with the first side magnet 43 to form the third magnetic gap 34. That is, the third sound-generating unit 30 and the first sound-generating unit 10 share the first side magnet 43, simplifying the structure of the magnetic circuit system of the sound-generating unit 100, improving structural compactness, and saving costs. The third side magnet 33 and the first side magnet 43 can form a complete magnetic circuit, providing a high magnetic induction intensity magnetic field for the tweeter unit 30a without reducing the performance of the first sound-generating unit 10 and the second sound-generating unit 20BL.

[0048] like Figure 2 and Figure 3 As shown, in one embodiment, the third voice coil 32 is a flat voice coil, and the axis of the flat voice coil is aligned with the first direction, that is, the axis of the flat voice coil extends in the front-back direction. The flat voice coil is thinner and occupies less space in the front-back direction, improving the structural compactness of the sound-generating unit 100.

[0049] Furthermore, the third voice coil 32 is provided with two extended edges 321 spaced apart along the second direction. Each extended edge 321 extends along a third direction, which is perpendicular to the first and second directions respectively. One extended edge 321 is connected to the third diaphragm assembly 31 and located outside the third magnetic gap 34, while the other extended edge 321 is inserted into the third magnetic gap 34.

[0050] like Figure 1 and Figure 2As shown, the third direction is the left-right direction, which is perpendicular to the first and second directions. The two extended sides 321 of the flat voice coil are distributed vertically and horizontally, with each extended side 321 extending in the left-right direction. The extended side 321 located on the upper side is connected to the third diaphragm assembly 31 and is located outside the third magnetic gap 34, providing support for the third diaphragm assembly 31. The extended side 321 located on the lower side is inserted into the third magnetic gap 34, providing driving force to the third diaphragm assembly 31 when there is signal excitation, so as to achieve vertical vibration. The structural design is reasonable.

[0051] In one embodiment, the sound-generating unit 100 further includes a magnetic yoke 50 and a magnetic plate 60 spaced apart along a first direction. A first magnetic circuit assembly 40 is located between the magnetic yoke 50 and the magnetic plate 60. The magnetic yoke 50 includes a body portion 51 and a bent extension portion 52. The first magnetic circuit assembly 40 is disposed on the body portion 51. The bent extension portion 52 is disposed at one end of the body portion 51 and bends away from the first magnetic circuit assembly 40. The bent extension portion 52 cooperates with the first side magnet 43 to define a mounting groove 53. A third side magnet 33 is located in the mounting groove 53 and is spaced apart from the first side magnet 43 to form a third magnetic gap 34.

[0052] like Figure 2 and Figure 3 As shown, the magnetic yoke 50 is located in front of the magnetic plate 60, and the first magnetic circuit assembly 40 of the sound-generating unit 100 is located between the magnetic yoke 50 and the magnetic plate 60. The magnetic yoke 50 and the magnetic plate 60 serve to guide magnetism and correct magnetic field lines. To facilitate the installation of the third side magnet 33, the upper end of the main body 51 of the magnetic yoke 50 is bent forward to form a bent extension 52. The bent extension 52 cooperates with the first side magnet 43 to define a mounting groove 53, thereby realizing the installation of the third side magnet 33. The structural design is ingenious and reasonable. The magnetic yoke 50 can install both the first magnetic circuit assembly 40 and the third side magnet 33, which has strong compatibility and good structural compactness.

[0053] In one embodiment, the magnetic plate 60 includes a side magnetic plate 61 and a central magnetic plate 62. The side of the first side magnet 43 facing away from the magnetic yoke 50 is connected to the side magnetic plate 61, and the side of the ring magnet 44 and the central magnet 45 facing away from the magnetic yoke 50 are both connected to the central magnetic plate 62.

[0054] like Figure 2 and Figure 3As shown, the side magnetic plate 61 is positioned corresponding to the first side magnet 43, and the rear side of the first side magnet 43 is connected to the side magnetic plate 61. The side magnetic plate 61 serves to guide magnetism and correct magnetic field lines. The center magnetic plate 62 is positioned corresponding to the ring magnet 44 and the center magnet 45, and the rear sides of the ring magnet 44 and the center magnet 45, which are away from the magnetic yoke 50, are both connected to the center magnetic plate 62. The center magnetic plate 62 serves to guide magnetism and correct magnetic field lines. The ring magnet 44 and the center magnet 45 share the center magnetic plate 62, simplifying the structure of the sound-generating unit 100. A secondary magnetic plate 46 is also provided on the side of the center magnet 45 facing the magnetic yoke 50. The secondary magnetic plate 46 also serves to guide magnetism and correct magnetic field lines.

[0055] like Figure 4 As shown, in another embodiment, the sound-generating unit 100 further includes a magnetic yoke 50 and a magnetic plate 60 spaced apart along a first direction. The first magnetic circuit assembly 40 is located between the magnetic yoke 50 and the magnetic plate 60. The third sound-generating unit 30 includes a central magnet 35. The magnetic yoke 50 and the magnetic plate 60 are respectively disposed on both sides of the central magnet 35 and form a third magnetic gap 34 between them and the central magnet 35. The third sound-generating unit 30 includes a third voice coil 32. One end of the third voice coil 32 is connected to the third diaphragm assembly 31, and the other end of the third voice coil 32 is inserted into the third magnetic gap 34.

[0056] Specifically, the magnetic yoke 50 is located in front of the magnetic plate 60, and the first magnetic circuit assembly 40 of the sound-generating unit 100 is located between the magnetic yoke 50 and the magnetic plate 60. The magnetic yoke 50 and the magnetic plate 60 serve to guide magnetism and correct magnetic field lines. The third sound-generating unit 30 includes a central magnet 35, which can be arranged adjacent to the first side magnet 43. The magnetic yoke 50 and the magnetic plate 60 are respectively arranged on the front and rear sides of the central magnet 35, and both form a third magnetic gap 34 with the central magnet 35. The upper end of the third voice coil 32 is connected to the third diaphragm assembly 31, and the lower end of the third voice coil 32 is inserted into the third magnetic gap 34, realizing the up and down vibration of the third voice coil 32 and the third diaphragm assembly 31.

[0057] In this embodiment, a central magnetic guide plate 39 is also provided on the side of the central magnet 35 facing the third diaphragm assembly 31. The central magnetic guide plate 39 can play the role of guiding magnetism and correcting magnetic field lines. Furthermore, the magnetic guide plate 60 includes a side magnetic guide plate 61 and a central magnetic guide plate 62. The side of the first side magnet 43 facing away from the magnetic guide yoke 50 is connected to the side magnetic guide plate 61, and the sides of the ring magnet 44 and the central magnet 45 facing away from the magnetic guide yoke 50 are both connected to the central magnetic guide plate 62.

[0058] Furthermore, the voice coil of the third sound-generating unit 30 is a cylindrical voice coil, and the axis of the cylindrical voice coil is aligned with the second direction, that is, the axis of the cylindrical voice coil extends in the vertical direction. The cylindrical voice coil has the same shape as the third diaphragm assembly 31, which facilitates its installation with the third diaphragm assembly 31, and the contact area between the cylindrical voice coil and the third diaphragm assembly 31 is large, which is beneficial for driving the third diaphragm assembly 31 to vibrate.

[0059] like Figures 1 to 4 As shown, in one embodiment, the first sound-generating unit 10 includes a first housing 13, and a first diaphragm assembly 11 is mounted on the first housing 13; the third sound-generating unit 30 includes a third housing 36, which is mounted on one side of the first housing 13 along the second direction, and a third diaphragm assembly 31 is mounted on the third housing 36.

[0060] The first diaphragm assembly 11 is mounted on the first housing 13, realizing the assembly of the first diaphragm assembly 11 and the first housing 13. The third diaphragm assembly 31 is mounted on the third housing 36, realizing the assembly of the third diaphragm assembly 31 and the third housing 36. Furthermore, the third housing 36 is mounted on one side of the first housing 13 along the second direction, that is, along the vertical direction. The structural design is reasonable and convenient for assembly. In one embodiment, the third housing 36 is mounted on the upper side of the first housing 13.

[0061] Furthermore, the first housing 13 and the third housing 36 are formed as a single molded part, eliminating assembly steps and assembly errors, making them easier to manufacture. Moreover, there is no need to manufacture the first housing 13 and the third housing 36 separately, reducing manufacturing costs. Furthermore, the integrated molding of the first housing 13 and the third housing 36 achieves an integrated design, resulting in a compact structure, reduced space occupation, and facilitating miniaturization. Even further, both the first housing 13 and the third housing 36 are made of plastic materials, and the single injection molding of the first housing 13 and the third housing 36 facilitates manufacturing, makes the materials readily available, and results in a lighter weight, meeting the requirements of lightweight design.

[0062] In one embodiment, the first housing 13 extends along a second direction, the third housing 36 extends along a first direction, and the third housing 36 is located on one side of the first housing 13.

[0063] like Figure 2 As shown, the first housing 13 extends in the vertical direction, that is, it extends in the horizontal direction, so as to install the first diaphragm assembly 11 and realize the first diaphragm assembly 11 vibrating in the front-back direction; the third housing 36 extends in the front-back direction, that is, it extends in the vertical direction, so as to install the third diaphragm assembly 31 and realize the third diaphragm assembly 31 vibrating in the vertical direction. Moreover, the third housing 36 is located on the upper side of the first housing 13, and the structural design is reasonable and compact.

[0064] like Figures 5 to 14As shown, a first rear cavity 15 is formed between the first diaphragm assembly 11 and the first housing 13. The second sound-generating unit 20 includes a second housing 23. A second rear cavity 25 is formed between the second diaphragm assembly 21 and the second housing 23. A third rear cavity 38 is formed between the third diaphragm assembly 31 and the third housing 36. The first diaphragm assembly 11 includes an annular first diaphragm 111 and a first vibrating plate 112 connected to the inner edge of the first diaphragm 111. The second diaphragm assembly 21 includes an annular second diaphragm 211 and a second vibrating plate 212 connected to the inner edge of the second diaphragm 211. The third diaphragm assembly 31 includes an annular third diaphragm 311 and a third vibrating plate 312 connected to the inner edge of the third diaphragm 311.

[0065] like Figure 1 and Figure 2 As shown, the sound-generating unit 100 also includes an FPCB 70, a front cover 26, a steel mesh 80, and a centering support 90. The FPCB 70 enables the circuit of the sound-generating unit 100 to conduct. The front cover 26 is installed on the second housing 23 and serves a protective function. The steel mesh 80 is installed on the magnetic yoke 50 and is located on the outside of the sound hole of the sound-generating unit 100, serving to allow air to pass through and isolate sound-absorbing particles. The centering support 90 serves a centering function to prevent polarization.

[0066] like Figures 5 to 10 As shown, in one embodiment, the first sound-emitting unit 10 has a first rear cavity 15, the second sound-emitting unit 20 has a second rear cavity 25, and the third sound-emitting unit 30 has a third rear cavity 38. The first rear cavity 15 and the third rear cavity 38 are connected, and the first rear cavity 15 and the second rear cavity 25 are isolated from each other. It can be understood that since the first rear cavity 15 and the third rear cavity 38 are connected, and the first rear cavity 15 and the second rear cavity 25 are isolated from each other, the third rear cavity 38 is also isolated from the second rear cavity 25. The second rear cavity 25 can be connected to the rear cavity of the electronic device 300 described later.

[0067] In this embodiment, when in SPK mode, only SPK unit 10a and tweeter unit 30a are working, and tweeter unit 30a widens the playback bandwidth. In RCV mode, SPK unit 10a and RCV unit 20a vibrate in the same direction, generating sound waves with the same amplitude but opposite phase, forming an acoustic dipole effect and improving call privacy. The tweeter unit 30a operates in a frequency band greater than 2000 Hz, canceling the superimposed sound field from the far field of the electronic device 300, improving the mid-to-high frequency cancellation effect, thereby significantly reducing mid-to-high frequency sound leakage and further enhancing call privacy.

[0068] like Figure 8 , Figure 11 and Figure 12As shown, in another embodiment, the first sound-emitting unit 10 has a first rear cavity 15, the second sound-emitting unit 20 has a second rear cavity 25, and the third sound-emitting unit 30 has a third rear cavity 38, with the first rear cavity 15, the second rear cavity 25, and the third rear cavity 38 interconnected.

[0069] In this embodiment, when in SPK mode, SPK unit 10a, RCV unit 20a and tweeter unit 30a work simultaneously. SPK unit 10a and RCV unit 20a vibrate in opposite directions to generate sound waves with the same phase. The two sound waves are superimposed to improve the playback effect, and tweeter unit 30a widens the sound playback frequency band.

[0070] In RCV mode, there are two scenarios: In the first scenario, only the RCV unit 20a and the tweeter unit 30a are operational. Since the second rear cavity 25 and the third rear cavity 38 are interconnected, when the RCV unit 20a operates, it drives the SPK unit 10a to vibrate in the same direction, producing vibrations with the same amplitude but opposite phases, creating an acoustic dipole effect and enhancing call privacy. The tweeter unit 30a operates in a frequency band greater than 2000 Hz, canceling the superimposed sound field from the far field of the electronic device 300, improving the mid-to-high frequency cancellation effect, thereby significantly reducing mid-to-high frequency sound leakage and further enhancing call privacy. In the second scenario, all three units—SPK unit 10a, RCV unit 20a, and tweeter unit 30a—operate. SPK unit 10a and RCV unit 20a vibrate in the same direction, producing sound waves with the same amplitude but opposite phase, creating an acoustic dipole effect and enhancing call privacy. Tweeter unit 30a operates at a frequency greater than 2000 Hz, canceling the superimposed sound field from the far field of the electronic device 300, improving the mid-to-high frequency cancellation effect, thereby significantly reducing mid-to-high frequency sound leakage and further enhancing call privacy.

[0071] like Figure 8 , Figure 13 and Figure 14 As shown, in another embodiment, the first sound-emitting unit 10 has a first rear cavity 15, the second sound-emitting unit 20 has a second rear cavity 25, and the third sound-emitting unit 30 has a third rear cavity 38. The first rear cavity 15, the second rear cavity 25, and the third rear cavity 38 are isolated from each other, that is, the first rear cavity 15, the second rear cavity 25, and the third rear cavity 38 are independently arranged.

[0072] In this embodiment, when in SPK mode, only SPK unit 10a and tweeter unit 30a are working, and tweeter unit 30a widens the playback bandwidth. In RCV mode, SPK unit 10a and RCV unit 20a vibrate in the same direction, generating sound waves with the same amplitude but opposite phase, forming an acoustic dipole effect and improving call privacy. The tweeter unit 30a operates in a frequency band greater than 2000 Hz, canceling the superimposed sound field from the far field of the electronic device 300, improving the mid-to-high frequency cancellation effect, thereby significantly reducing mid-to-high frequency sound leakage and further enhancing call privacy.

[0073] like Figures 5 to 7 As shown, the electronic device 300 of the present invention includes a housing 304 and a sound-emitting module 200 housed within the housing 304. The sound-emitting module 200 includes a protective shell 201 and a sound-emitting unit 100 installed within the protective shell 201. The protective shell 201 has a first sound outlet channel 202 and a third sound outlet channel 203. The first sound-emitting unit 10 has a first front cavity 14, and the first sound outlet channel 202 communicates with the first front cavity 14. The third sound-emitting unit 30 has a third front cavity 37, and the third sound outlet channel 203 communicates with the third front cavity 37.

[0074] The sound-generating unit 100 is installed inside the protective shell 201. The first diaphragm assembly 11 of the first sound-generating unit 10 and the protective shell 201 form a first front cavity 14, and the first sound outlet channel 202 communicates with the first front cavity 14 to transmit sound. The third diaphragm assembly 31 of the third sound-generating unit 30 and the protective shell 201 form a third front cavity 37, and the third sound outlet channel 203 communicates with the third front cavity 37 to transmit sound. The second sound-generating unit 20 has a second front cavity 24, and the second diaphragm assembly 21 of the second sound-generating unit 20 and the front cover 26 form the second front cavity 24 to transmit sound. Furthermore, the first sound hole 301 communicates with the first sound outlet channel 202 to emit sound. The second sound-generating unit 20 has a second front cavity 24, and the second sound hole 302 communicates with the second front cavity 24 to emit sound. The third sound hole 303 communicates with the third sound outlet channel 203 to emit sound. It should be noted that... Figure 6 , Figure 7 middle, Figures 9 to 14 The dashed arrow indicates the direction of sound transmission.

[0075] like Figures 15 to 26 As shown, in one embodiment, the outer edge of the housing 304 forms a middle frame 308, and a screen 306 and a back cover 307 are mounted on the side of the housing 304. Mounting edges 309 are formed on the housing 304 at the positions between the top of the middle frame 308 and the top of the screen 306 and / or between the top of the middle frame 308 and the top of the back cover 307. A first sound hole 301 is located at the top of the middle frame 308, a second sound hole 302 is disposed near the first sound hole 301 and located at the mounting edge 309, and a third sound hole 303 is located at the top of the middle frame 308 or at the mounting edge 309.

[0076] Taking a mobile phone as an example, the outer casing 304 is the entire casing 304, and the speaker unit 100 can be set near the top of the casing. The screen 306 and the back cover 307 are the mobile phone screen 306 and the mobile phone back cover 307, respectively. The outer edge of the casing 304, specifically its circumferential outer edge, forms a middle frame 308. The position between the top of the middle frame 308 and the top of the screen 306 can form a mounting edge 309, and the position between the top of the middle frame 308 and the top of the back cover 307 can also form a mounting edge 309. The first sound hole 301 is located at the top of the middle frame 308, the second sound hole 302 is located at the mounting edge 309 and close to the first sound hole 301, and the third sound hole 303 is located at the top of the middle frame 308 or the mounting edge 309. The layout is reasonable and conducive to answering calls or playing sound outwards.

[0077] like Figures 15 to 20 , Figure 26 As shown, in one embodiment, the outer shell 304 includes two rectangular folding shells 305 that can be folded or unfolded along their long sides. Screens 306 are installed on opposite sides of one folding shell 305, and screens 306 and back covers 307 are installed on opposite sides of the other folding shell 305, respectively. A sound-emitting unit 100 is housed inside one of the folding shells 305, and a first sound hole 301 is located at the top of the corresponding middle frame 308 of the folding shell 305, a second sound hole 302 is located at the corresponding mounting edge 309 of the folding shell 305, and a third sound hole 303 is located at the top of the corresponding middle frame 308 or the mounting edge 309 of the folding shell 305.

[0078] In this embodiment, the electronic device 300 is a foldable screen mobile phone, and its outer casing 304 includes two rectangular foldable shells 305. The two foldable shells 305 can be folded or unfolded along the long side of the outer casing 304. One of the foldable shells 305 has a screen 306 installed on its front and rear sides, and the two screens 306 are respectively a secondary screen 306b and a first screen 3061; the other foldable shell 305 has a screen 306 and a back cover 307 installed on its front and rear sides, and the screen 306 is a second screen 3062.

[0079] Understandably, when the two folding shells 305 of the foldable phone are folded together, the secondary screen 306b is exposed on the front side; this screen 306 can be referred to as the secondary screen 306b. The first screen 3061 and the second screen 3062 are folded inside, and the back cover 307 is exposed on the rear side. When the two folding shells 305 of the foldable phone are unfolded, the first screen 3061 and the second screen 3062 are positioned on the same side and form the main screen 306a, while the secondary screen 306b is positioned on the same side as the back cover 307.

[0080] In the two folding shells 305, one of the folding shells 305 houses a sound-emitting unit 100. A first sound hole 301 is formed at the top of the corresponding middle frame 308 of the folding shell 305 to enable sound output from the first sound-emitting unit 100. A second sound hole 302 is formed at the corresponding mounting edge 309 of the folding shell 305 to enable sound output from the second sound-emitting unit 20. The second sound hole 302 can be located at the top of the sub-screen 306b. A third sound hole 303 is formed at the top of the corresponding middle frame 308 or at the corresponding mounting edge 309 of the folding shell 305 to enable sound output from the third sound-emitting unit 300. The third sound hole 303 can be located at the top of the corresponding middle frame 308 of the folding shell 305. Furthermore, the third sound hole 303 and the first sound hole 301 can be arranged sequentially along the width direction of the folding shell 305 at the top of the corresponding middle frame 308.

[0081] When a phone call needs to be answered, the electronic device 300 can be in RCV mode, and the two folding shells 305 can be folded together. When an external speaker is needed, the electronic device 300 can be in SPK mode. In this mode, the two folding shells 305 can be either folded together or unfolded. The unfolded state includes positions where the two folding shells 305 can form any angle between them, making it flexible and convenient to use.

[0082] Furthermore, there are multiple sound-emitting units 100, which are disposed in two folded shells 305. The multiple sound-emitting units 100 located in the same folded shell 305 are arranged side by side along the width direction of the folded shell and share the first sound hole group.

[0083] The number of sound-emitting units 100 can be flexibly set according to actual usage needs. By setting multiple sound-emitting units 100, the stereo effect of the sound can be improved, and the fullness and richness of the tone can be enhanced, thus optimizing the tone. Furthermore, the first sound-emitting units 10 of the multiple sound-emitting units 100 located in the same folding shell 305 share a first sound hole 301, the second sound-emitting units 20 of the multiple sound-emitting units 100 share a second sound hole 302, and the third sound-emitting units 30 of the multiple sound-emitting units 100 share a third sound hole 303, simplifying the structure and not affecting the appearance of the electronic device 300.

[0084] If all the multiple sound-generating units 100 are housed in the same folding shell 305, the volume occupied will be large, which is not conducive to the design of the folding shell 305 to be thin and small. Therefore, in this embodiment, the multiple sound-generating units 100 are distributed in two folding shells 305 to ensure the design of the folding shell 305 to be thin and small.

[0085] Furthermore, multiple sound-generating units 100 located within the same folded shell 305 are arranged side-by-side along the width direction of the folded shell. For example... Figure 15As shown, the width direction of the folding shell 305 is the left-right direction, the length direction of the folding shell 305 is the up-down direction, and the thickness direction of the folding shell 305 is the front-back direction.

[0086] Compared with the arrangement of multiple sound-emitting units 100 side by side along the length of the folded shell 305, the arrangement of multiple sound-emitting units 100 located in the same folded shell 305 along the width of the folded shell 305 in this embodiment can ensure that multiple sound-emitting units 100 are located near the top of the folded shell 305, shortening the position of the double-sided sound-emitting unit 400 and the first sound hole group on the folded shell 305, which is beneficial for sound output.

[0087] Compared with multiple double-sided sound units 400 arranged side by side along the thickness direction of the folded shell 305, in this embodiment, multiple sound units 100 located in the same folded shell 305 are arranged side by side along the width direction of the folded shell 305, which can not occupy too much space in the thickness direction of the folded shell 305, thus achieving a thinner and lighter design.

[0088] like Figure 18 As shown, in one embodiment, when the two folding shells 305 are folded, the first acoustic hole group located on one folding shell 305 is positioned opposite to the first acoustic hole group located on the other folding shell 305.

[0089] Specifically, the two first sound holes 301 on the two folded shells 305 are arranged facing each other, the two second sound holes 302 on the two folded shells 305 are arranged facing each other and back to back, and the two third sound holes 303 on the two folded shells 305 are arranged facing each other, so as to achieve collinear arrangement. The structural design is reasonable and simple.

[0090] like Figure 19 As shown, in another embodiment, when the two folding shells 305 are folded, the first acoustic hole group located on one folding shell 305 is misaligned with the first acoustic hole group located on the other folding shell 305. Specifically, the two first acoustic holes 301 located on the two folding shells 305 are misaligned, the two second acoustic holes 302 located on the two folding shells 305 are misaligned and opposite to each other, and the two third acoustic holes 303 located on the two folding shells 305 are misaligned, resulting in a flexible structural design.

[0091] like Figure 20As shown, in another embodiment, the electronic device 300 further includes a dual-sided sound-emitting unit 400, which is housed within another folding shell 305. The dual-sided sound-emitting unit 400 includes a fourth sound-emitting unit 401 and a fifth sound-emitting unit 402 arranged opposite to each other. The folding shell 305 has a second set of sound holes, which includes a fourth sound hole 404 communicating with the fourth sound-emitting unit 401 and a fifth sound hole 405 communicating with the fifth sound unit 402. The fourth sound hole 404 is located at the top of the corresponding middle frame 308 of the folding shell 305, and the fifth sound hole 405 is located on the corresponding mounting edge 309 of the folding shell 305 near the fourth sound hole 404.

[0092] In this embodiment, the sound-emitting unit 100 is housed within one of the folded shells 305, while the double-sided sound-emitting unit 400 is housed within the other folded shell 305, resulting in a reasonable structural design. The diaphragm assembly of the fourth sound-emitting unit 401 is a fourth diaphragm assembly 4011, and the diaphragm assembly of the fifth sound-emitting unit 402 is a fifth diaphragm assembly 4021. The sound-emitting direction of the fourth sound-emitting unit 401 and the fifth sound-emitting unit 402 in the double-sided sound-emitting unit 400 are arranged back-to-back, that is, the fourth diaphragm assembly 4011 and the fifth diaphragm assembly 4021 are arranged back-to-back. In one embodiment, the fourth diaphragm assembly 4011 emits sound forward, and the fifth diaphragm assembly 4021 emits sound backward.

[0093] The sound-emitting area of ​​the fourth diaphragm assembly 4011 and the sound-emitting area of ​​the fifth diaphragm assembly 4021 may be the same or different. In one embodiment, the sound-emitting areas of the fourth diaphragm assembly 4011 and the fifth diaphragm assembly 4021 are the same. The folded shell 305 where the double-sided sound-emitting unit 400 is located has a fourth sound hole 404 and a fifth sound hole 405. The fourth sound-emitting unit 401 emits sound through the fourth sound hole 404, and the fifth sound-emitting unit 402 emits sound through the fifth sound hole 405.

[0094] When a phone call needs to be answered, the electronic device 300 can be in RCV mode. The fourth and fifth sound units 401 and 402 of the dual-sided sound unit 400 vibrate in the same direction, i.e., the fourth diaphragm assembly 4011 and the fifth diaphragm assembly 4021 vibrate in the same direction, generating sound waves with the same amplitude but opposite phase, forming a dipole effect and improving call privacy. When external sound is needed, the electronic device 300 can be in SPK mode. The fourth sound unit 401 of the dual-sided sound unit 400 vibrates in opposite directions, i.e., the fourth diaphragm assembly 4011 and the fifth diaphragm assembly 4021 vibrate in opposite directions, generating sound waves with the same phase. The sound waves emitted from the fourth sound hole 404 and the fifth sound hole 405 superimpose to provide sufficient external loudness and improve sound quality.

[0095] In one embodiment, when the two folding shells 305 are folded, the first and second sound hole groups are positioned opposite each other to achieve collinear arrangement, resulting in a reasonable and simple structural design.

[0096] In another embodiment, when the two folding shells 305 are folded, the first and second sound hole groups are staggered, resulting in a flexible structural design.

[0097] In one embodiment, there are multiple double-sided sound generating units 400, which are disposed in two folded shells 305. The multiple double-sided sound generating units 400 located in the same folded shell 305 are arranged side by side along the width direction of the folded shell and share a second sound hole group. Preferably, the number of double-sided sound generating units 400 housed in the two folded shells 305 is the same.

[0098] When a phone call needs to be answered, the electronic device 300 can be in RCV mode, and the two folding shells 305 can be folded together, bringing them closer together. Within one folding shell 305, the fourth sound unit 401 and the fifth sound unit 402 of each double-sided sound unit 400 vibrate in the same direction, generating sound waves with the same amplitude but opposite phase, which are emitted through the fourth sound hole 404 and the fifth sound hole 405 on that folding shell 305, respectively. Similarly, within the other folding shell 305, the fourth sound unit 401 and the fifth sound unit 402 of each double-sided sound unit 400 vibrate in the same direction, generating sound waves with the same amplitude but opposite phase, which are also emitted through the fourth sound hole 404 and the fifth sound hole 405 on that folding shell 305, respectively. Furthermore, the sound waves emitted from the fourth and fifth sound holes 404 of one of the folded shells 305 and the sound waves emitted from the fourth and fifth sound holes 404 of the other folded shell 305 form a quadrupole effect in the far field, effectively reducing sound leakage in the far field, greatly improving the privacy of the call, and providing good privacy protection.

[0099] When external sound is needed, the electronic device 300 can be in SPK mode. The two folding shells 305 can be either folded or unfolded. The unfolded state includes positions where the two folding shells 305 can form any angle between them, making it flexible and convenient to use. In SPK mode, the fourth sound unit 401 and the fifth sound unit 402 of each double-sided sound unit 400 in one of the folding shells 305 vibrate in opposite directions, generating sound waves with the same phase, and emitting sound through the fourth sound hole 404 and the fifth sound hole 405 on the folding shell 305 respectively; the fourth sound unit 401 and the fifth sound unit 402 of each double-sided sound unit 400 in the other folding shell 305 also vibrate in opposite directions, generating sound waves with the same phase, and emitting sound through the third sound hole 303 and the fourth sound hole 404 on the folding shell 305 respectively. Furthermore, the sound waves emitted from the fourth sound hole 404 and the fifth sound hole 405 of one folding shell 305 and the sound waves emitted from the fourth sound hole 404 and the fifth sound hole 405 of the other folding shell 305 are superimposed to provide sufficient external loudness and improve sound quality performance, thus possessing sufficient external loudness function and higher sound quality performance function.

[0100] It should be noted that the phase of the sound wave in the fourth sound hole 404 is opposite in polarity to the phase of the sound wave in the fifth sound hole 405. Among the multiple double-sided sound units 400 in the same folded shell 305, the multiple fourth sound units 401 with the same sound wave phase share the fourth sound hole 404 on the folded shell 305, and the multiple fifth sound units 402 with the same phase share the fifth sound hole 405 on the folded shell 305.

[0101] Multiple double-sided sound-emitting units 400 located within the same folded shell 305 are arranged side by side along the width direction of the folded shell.

[0102] Compared with multiple double-sided sound generating units 400 arranged side by side along the length of the folded shell 305, in this embodiment, multiple double-sided sound generating units 400 arranged side by side along the width of the folded shell 305 within the same folded shell 305 can ensure that multiple double-sided sound generating units 400 are all located near the top of the folded shell 305, shortening the position of the double-sided sound generating units 400 and the third sound hole 303 on the folded shell 305, which is beneficial for sound output.

[0103] Compared with multiple double-sided sound units 400 arranged side by side along the thickness direction of the folded shell 305, in this embodiment, multiple double-sided sound units 400 in the same folded shell 305 are arranged side by side along the width direction of the folded shell 305, which can not occupy too much space in the thickness direction of the folded shell 305, thus achieving a thinner and lighter design.

[0104] In one embodiment, the dual-sided sound-emitting unit 400 includes a fourth sound-emitting unit 401 and a fifth sound-emitting unit 402 that are independent of each other and arranged back to back; or, the fourth sound-emitting unit 401 and the fifth sound-emitting unit 402 are arranged side by side; the fourth sound-emitting unit 401 and the fifth sound-emitting unit 402 respectively form two sound-emitting surfaces 406 arranged back to back.

[0105] If the folding shell 305 is thick enough to provide sufficient installation space in its thickness direction, the fourth sound unit 401 and the fifth sound unit 402 can be independent of each other and their positions can be flexibly set. It is only necessary to ensure that the fourth sound unit 401 and the fifth sound unit 402 are set back to back, that is, to ensure that the fourth diaphragm assembly 4011 of the fourth sound unit 401 and the fifth diaphragm assembly 4021 of the fifth sound unit 402 are set back to back. If the folding shell 305 is thin, the fourth sound unit 401 and the fifth sound unit 402 can be set side by side, specifically side by side along the width direction of the folding shell 305. For example, the fourth sound unit 401 and the fifth sound unit 402 are arranged in a row and back to back. The first side of the fourth sound unit 401 is flush with the second side of the fifth sound unit 402, and the second side of the fourth sound unit 401 is flush with the first side of the fifth sound unit 402. The fourth diaphragm assembly 4011 of the fourth sound unit 401 is located on the first side of the fourth sound unit 401, and the fifth diaphragm assembly 4021 of the fifth sound unit 402 is located on the first side of the fifth sound unit 402.

[0106] like Figures 21 to 23 As shown, in another embodiment, the dual-sided sound-emitting unit 400 includes a fourth sound-emitting unit 401, a fifth sound-emitting unit 402, and a second magnetic circuit assembly 403. The fourth sound-emitting unit 401 includes a fourth diaphragm assembly 4011 and a fourth voice coil 4012. The fifth sound-emitting unit 402 includes a fifth diaphragm assembly 4021 and a fifth voice coil 4022. The second magnetic circuit assembly 403 is provided with a fourth magnetic gap 4031 and a fifth magnetic gap 4032. The fourth diaphragm assembly 4011 and the fifth diaphragm assembly 4022... The components 4021 are arranged back to back. One end of the fourth voice coil 4012 is connected to the fourth diaphragm assembly 4011, and the other end of the fourth voice coil 4012 is inserted into the fourth magnetic gap 4031. One end of the fifth voice coil 4022 is connected to the fifth diaphragm assembly 4021, and the other end of the fifth voice coil 4022 is inserted into the fifth magnetic gap 4032. The fourth diaphragm assembly 4011 and the fifth diaphragm assembly 4021 respectively form two sound-emitting surfaces 406, and the two sound-emitting surfaces 406 are arranged back to back.

[0107] Taking the folded shell 305 located on the front side in the folded state as an example, in the double-sided sound unit 400 inside, the fourth diaphragm assembly 4011 and the fifth diaphragm assembly 4021 are arranged back to back along the front-back direction. The second magnetic circuit assembly 403 is located between the fourth diaphragm assembly 4011 and the fifth diaphragm assembly 4021. The second magnetic circuit assembly 403 is provided with a fourth magnetic gap 4031 for the rear end of the fourth voice coil 4012 to be inserted, so as to realize the front-back vibration of the fourth voice coil 4012 and the fourth diaphragm assembly 4011. The second magnetic circuit assembly 403 is also provided with a fifth magnetic gap 4032 for the front end of the fifth voice coil 4022 to be inserted, so as to realize the front-back vibration of the fifth voice coil 4022 and the fifth diaphragm assembly 4021. In this embodiment, the second magnetic circuit assembly 403 incorporates both the fourth magnetic gap 4031 and the fifth magnetic gap 4032, allowing the fourth sound-generating unit 401 and the fifth sound-generating unit 402 to share the second magnetic circuit assembly 403. This simplifies the structure of the second magnetic circuit assembly 403 and makes it more compact. In a preferred embodiment, the fourth magnetic gap 4031 and the fifth magnetic gap 4032 are arranged opposite to each other and are interconnected, further simplifying the structure of the second magnetic circuit assembly 403.

[0108] In another embodiment, the dual-sided sound unit 400 may be a DPS sound unit, which is compatible with a fourth sound unit 401 and a fifth sound unit 402. The fourth sound unit 401 and the fifth sound unit 402 respectively form two sound-emitting surfaces 406 arranged back to back, which has a high degree of integration and a compact structure.

[0109] In other embodiments, the outer casing 304 is a rectangular casing, the screen 306 and the back cover 307 are respectively installed on opposite sides of the outer casing 304, and the number of sound-emitting units 100 is one or more; when the number of sound-emitting units 100 is multiple, the multiple sound-emitting units 100 are arranged side by side along the width direction of the outer casing 304, and the multiple sound-emitting units 100 share a first sound hole group, or the outer casing 304 has a first sound hole group for each sound-emitting unit 100.

[0110] In this embodiment, the electronic device 300 is a flat-screen mobile phone with a rectangular shell. The screen 306 and the back cover 307 are respectively installed on the front and rear sides of the shell. When one or more sound-emitting units 100 share the first sound hole group, the first sound hole 301 of the first sound hole group is located at the top of the middle frame 308, the second sound hole 302 is located on the mounting edge 309, and the third sound hole 303 is located at the top of the middle frame 308 or the mounting edge 309. The structural layout is reasonable.

[0111] The number of sound-emitting units 100 can be flexibly set according to actual usage needs. By setting multiple sound-emitting units 100, the stereo effect of the sound can be improved, and the fullness and richness of the tone can be enhanced, thus optimizing the tone. Furthermore, the first sound-emitting unit 10 of multiple sound-emitting units 100 shares a first sound hole 301, the second sound-emitting unit 20 of multiple sound-emitting units 100 shares a second sound hole 302, and the third sound-emitting unit 30 of multiple sound-emitting units 100 shares a third sound hole 303, simplifying the structure and not affecting the appearance of the electronic device 300.

[0112] Multiple sound-emitting units 100 each have multiple first sound hole groups, meaning that the first sound hole groups corresponding to the multiple sound-emitting units 100 are independently set, with one sound-emitting unit 100 corresponding to one first sound hole group, further improving the stereo effect and optimizing the timbre. When multiple sound-emitting units 100 each have multiple first sound hole groups, the multiple first sound hole groups can be arranged side by side and spaced apart along the width direction of the outer shell 304, resulting in a reasonable structural design. The width direction of the outer shell 304 is the left-right direction, the length direction of the outer shell 304 is the up-down direction, and the thickness direction of the outer shell 304 is the front-back direction.

[0113] The shape and structure of the first sound hole 301, the second sound hole 302, the third sound hole 303, the fourth sound hole 404, and the fifth sound hole 405 can be flexibly set according to actual needs.

[0114] like Figure 26 As shown, in one embodiment, the first sound hole 301 is a racetrack-shaped hole that extends along the width direction of the outer shell 304, achieving an integrated design for the first sound hole 301, which is easy to manufacture. Figures 15 to 20 , Figure 24 , Figure 25 As shown, in another embodiment, the first sound hole 301 includes a plurality of spaced sound holes. Specifically, the plurality of sound holes are spaced apart along the width direction of the outer shell 304, realizing a split design of the first sound hole 301, which is flexible and convenient.

[0115] like Figure 26 As shown, in one embodiment, the third sound hole 303 is a racetrack-shaped hole that extends along the width direction of the outer shell 304, achieving an integrated design for the third sound hole 303, which is easy to manufacture. In another embodiment, the third sound hole 303 includes multiple spaced-apart sound holes. Specifically, the multiple sound holes are sequentially spaced along the width direction of the outer shell 304, achieving a split design for the third sound hole 303, which is flexible and convenient.

[0116] like Figures 15 to 20 , Figure 24 , Figure 25As shown, in one embodiment, the second sound hole 302 can be a racetrack-shaped hole, extending along the width direction of the outer shell 304, achieving an integrated design of the second sound hole 302, which is easy to manufacture. In another embodiment, the second sound hole 302 includes a plurality of spaced-apart sound holes. Specifically, the plurality of sound holes are sequentially spaced along the width direction of the outer shell 304, achieving a split design of the second sound hole 302, which is flexible and convenient.

[0117] In one embodiment, the fourth sound hole 404 can be a racetrack-shaped hole, extending along the width direction of the outer shell 304, achieving an integrated design of the fourth sound hole 404, which is easy to manufacture. In another embodiment, the fourth sound hole 404 includes a plurality of spaced-apart sound holes. Specifically, the plurality of sound holes are sequentially spaced along the width direction of the outer shell 304, achieving a split design of the fourth sound hole 404, which is flexible and convenient.

[0118] In one embodiment, the fifth sound hole 405 can be a racetrack-shaped hole, extending along the width direction of the outer shell 304, achieving an integrated design for the fifth sound hole 405, which is easy to manufacture. In another embodiment, the fifth sound hole 405 includes multiple spaced-apart sound holes. Specifically, the multiple sound holes are sequentially spaced along the width direction of the folded shell 305, achieving a split design for the fifth sound hole 405, which is flexible and convenient.

[0119] In a preferred embodiment, in the first group of sound holes, both the first sound hole 301 and the third sound hole 303 include multiple spaced-apart sound holes, and the third sound hole 303 may be located in the middle of the first sound hole 301. The second sound hole 302 may be a racetrack-shaped hole. In the second group of sound holes, the fourth sound hole 404 may be a racetrack-shaped hole, and the fifth sound hole 405 includes multiple spaced-apart sound holes.

[0120] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural transformations made using the contents of the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of the present invention.

Claims

1. An electronic device, characterized in that, The electronic device includes: A sound-emitting unit, comprising a first sound-emitting unit, a second sound-emitting unit, and a third sound-emitting unit, wherein the second sound-emitting unit and the first sound-emitting unit are arranged back-to-back; the first sound-emitting unit includes a first diaphragm assembly vibrating along a first direction, the second sound-emitting unit includes a second diaphragm assembly vibrating along the first direction, and the sound-emitting area of ​​the first diaphragm assembly is larger than the sound-emitting area of ​​the second diaphragm assembly; the third sound-emitting unit includes a third diaphragm assembly vibrating along a second direction, the second direction being arranged at an angle to the first direction, the third sound-emitting unit being a high-frequency sound-emitting unit, and the operating frequency band of the third sound-emitting unit being greater than 2000Hz; The outer shell houses the sound-emitting unit. The outer shell has a first set of sound holes, which includes a first sound hole communicating with the first sound-emitting unit, a second sound hole communicating with the second sound unit, and a third sound hole communicating with the third sound unit. The sound-emitting unit has a receiver mode; when the sound-emitting unit is in the receiver mode, the first sound-emitting unit and the second sound-emitting unit vibrate in the same direction to generate sound waves with the same amplitude but opposite phase. The third sound-emitting unit operates in a frequency band greater than 2000Hz to cancel the superimposed sound field after 2000Hz in the far field of the sound-emitting unit.

2. The electronic device as claimed in claim 1, characterized in that, The first diaphragm assembly and the second diaphragm assembly are respectively disposed on both sides of the sound-generating unit along the first direction. The sound-generating unit also includes a magnetic circuit assembly, which is located between the first diaphragm assembly and the second diaphragm assembly. The first sound-generating unit includes a first voice coil, and the second sound-generating unit includes a second voice coil. The magnetic circuit assembly is provided with a first magnetic gap and a second magnetic gap. One end of the first voice coil is connected to the first diaphragm assembly, and the other end of the first voice coil is inserted into the first magnetic gap. One end of the second voice coil is connected to the second diaphragm assembly, and the other end of the second voice coil is inserted into the second magnetic gap.

3. The electronic device as described in claim 2, characterized in that, The magnetic circuit assembly includes: The first side magnet; A ring magnet, wherein the first side magnet is located outside the ring magnet and forms the first magnetic gap with the ring magnet; A central magnet, wherein the ring magnet surrounds the outer periphery of the central magnet and forms a second magnetic gap between the ring magnet and the central magnet.

4. The electronic device as claimed in claim 3, characterized in that, The third sound-generating unit includes a third side magnet, and a third magnetic gap is formed between the third side magnet and the first side magnet. The third sound-generating unit includes a third voice coil, one end of which is connected to the third diaphragm assembly, and the other end of which is inserted into the third magnetic gap.

5. The electronic device as claimed in claim 4, characterized in that, The third voice coil is a flat voice coil, and the axis of the flat voice coil is aligned with the first direction.

6. The electronic device as claimed in claim 5, characterized in that, The third voice coil has two extended sides spaced apart along the second direction. Each extended side extends along a third direction, which is perpendicular to the first direction and the second direction, respectively. One of the extended sides is connected to the third diaphragm assembly and is located outside the third magnetic gap, while the other extended side is inserted into the third magnetic gap.

7. The electronic device as claimed in claim 4, characterized in that, The sound-generating unit further includes a magnetic yoke and a magnetic plate spaced apart along the first direction. The magnetic circuit assembly is located between the magnetic yoke and the magnetic plate. The magnetic yoke includes a body portion and a bent extension portion. The magnetic circuit assembly is disposed on the body portion. The bent extension portion is disposed at one end of the body portion and bends away from the magnetic circuit assembly. The bent extension portion cooperates with the first side magnet to define a mounting groove. The third side magnet is located in the mounting groove and is spaced apart from the first side magnet to form the third magnetic gap.

8. The electronic device as claimed in claim 7, characterized in that, The magnetic guide plate includes a side magnetic guide plate and a center magnetic guide plate. The side of the first side magnet away from the magnetic guide yoke is connected to the side magnetic guide plate. The sides of the ring magnet and the center magnet away from the magnetic guide yoke are both connected to the center magnetic guide plate.

9. The electronic device as claimed in claim 3, characterized in that, The sound-generating unit further includes a magnetic yoke and a magnetic plate spaced apart along the first direction. The magnetic circuit assembly is located between the magnetic yoke and the magnetic plate. The third sound-generating unit includes a central magnet. The magnetic yoke and the magnetic plate are respectively disposed on both sides of the central magnet and form a third magnetic gap with the central magnet. The third sound-generating unit includes a third voice coil. One end of the third voice coil is connected to the third diaphragm assembly, and the other end of the third voice coil is inserted into the third magnetic gap.

10. The electronic device as claimed in claim 9, characterized in that, The voice coil of the third sound-generating unit is a cylindrical voice coil, and the axis of the cylindrical voice coil is aligned with the second direction.

11. The electronic device as claimed in claim 1, characterized in that, The first sound-emitting unit has a first rear cavity, the second sound-emitting unit has a second rear cavity, and the third sound-emitting unit has a third rear cavity; The first rear cavity is connected to the third rear cavity, and the first rear cavity is isolated from the second rear cavity; Alternatively, the first rear cavity, the second rear cavity, and the third rear cavity are interconnected; or the first rear cavity, the second rear cavity, and the third rear cavity are isolated from each other.

12. The electronic device according to any one of claims 1-11, characterized in that, The outer edge of the housing forms a middle frame, and a screen and a back cover are installed on the side of the housing. Mounting edges are formed on the housing at positions between the top of the middle frame and the top of the screen and / or between the top of the middle frame and the top of the back cover. The first sound hole is located at the top of the middle frame, the second sound hole is located close to the first sound hole and at the mounting edge, and the third sound hole is located at the top of the middle frame or the mounting edge.

13. The electronic device as claimed in claim 12, characterized in that, The outer casing includes two rectangular folding shells that can be folded or unfolded along their long sides. The screen is installed on both opposite sides of one of the folding shells, and the screen and the back cover are installed on opposite sides of the other folding shell, respectively. The sound-emitting unit is housed within one of the folding shells, and the first sound hole is located at the top of the middle frame corresponding to the folding shell, the second sound hole is located at the mounting edge corresponding to the folding shell, and the third sound hole is located at the top of the middle frame or the mounting edge corresponding to the folding shell.

14. The electronic device as claimed in claim 13, characterized in that, The number of sound-emitting units is multiple, and the multiple sound-emitting units are disposed in two folded shells. The multiple sound-emitting units located in the same folded shell are arranged side by side along the width direction of the folded shell and share the first sound hole group.

15. The electronic device as claimed in claim 14, characterized in that, When the two folding shells are folded, the first acoustic hole group on one of the folding shells is either directly opposite or offset from the first acoustic hole group on the other folding shell.

16. The electronic device as claimed in claim 13, characterized in that, The electronic device further includes a dual-sided sound-emitting unit, which is housed within another folding shell. The dual-sided sound-emitting unit includes a fourth sound-emitting unit and a fifth sound-emitting unit arranged back-to-back. The folding shell has a second set of sound holes, which includes a fourth sound hole communicating with the fourth sound-emitting unit and a fifth sound hole communicating with the fifth sound unit. The fourth sound hole is located at the top of the middle frame corresponding to the folding shell, and the fifth sound hole is located on the mounting edge of the folding shell near the fourth sound hole.

17. The electronic device as claimed in claim 16, characterized in that, When the two folding shells are folded, the first acoustic hole group and the second acoustic hole group are either directly opposite each other or staggered.

18. The electronic device as claimed in claim 16, characterized in that, The number of the dual-sided sound-emitting units is multiple, and the multiple dual-sided sound-emitting units are disposed in two folded shells. The multiple dual-sided sound-emitting units located in the same folded shell are arranged side by side along the width direction of the folded shell and share the second sound hole group.

19. The electronic device as claimed in claim 12, characterized in that, The outer shell is a rectangular shell, and the screen and the back cover are respectively installed on opposite sides of the outer shell. The number of sound-emitting units is one or more. When the number of sound-emitting units is multiple, the multiple sound-emitting units are arranged side by side along the width direction of the outer shell, and the multiple sound-emitting units share the first sound hole group. Alternatively, the outer shell has a first sound hole group for each sound-emitting unit.

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