Electronic device

Abstract

The invention provides an electronic device, which comprises a shell with an accommodating cavity and a sound production monomer arranged in the accommodating cavity, the sound production monomer divides the accommodating cavity into a front cavity and a rear cavity, the shell is provided with a front sound outlet hole and a rear sound outlet hole, and the sound production monomer is provided with a first side and a second side which are deviated from each other along the vibration direction of a vibration system. The first side is communicated with the front cavity, and the second side is communicated with the rear cavity; an airflow channel through which airflow of the second vibrating diaphragm flows out is arranged between the magnetic circuit system and the first vibrating diaphragm, and sound waves, facing the first side, of the second vibrating diaphragm are radiated outwards through the airflow channel and are radiated towards the first side together with sound waves, facing the first side, of the first vibrating diaphragm; sound waves, facing the second side, of the first vibrating diaphragm and sound waves, facing the second side, of the second vibrating diaphragm are jointly radiated to the second side; the rear sound outlet hole comprises a rear positive sound outlet hole, and the ratio of the area of the rear positive sound outlet hole to the effective radiation area of the second vibrating diaphragm is 5%-100%. According to the invention, the problem of low intermediate frequency loudness of the existing electronic equipment can be solved.

Description

Technical Field

[0001] The present invention relates to the field of sound generation technology, and more particularly, to an electronic device. Background Art

[0002] In recent years, with the development of electronic products, electronic devices such as headphones, smartphones, and VR have been recognized by consumers. As the performance of electronic products improves, the improvement of the acoustic performance of related sound-generating devices is also an inevitable trend, especially the frequency loudness of OWS (Open Wearable Stereo, Chinese meaning is fully open wearable headphones) headphones.

[0003] Existing electronic devices (such as OWS headphones) typically have sound outlets located only on the side of the rear cavity, resulting in a relatively high sound mass. The vibration system of previous single-diaphragm sound-emitting units had a relatively large vibration mass, making it less affected by sound mass. As users demand higher mid-frequency loudness in OWS headphones, the effective radiation area (SD) of the vibration system is increasing, while the vibration mass is becoming lighter. This significantly affects mid-frequency loudness, and the traditional side-outlet ducts in the rear cavity are also detrimental to improving mid-frequency loudness, resulting in poor performance and effectiveness of the electronic device. Summary of the Invention

[0004] In view of the above problems, an object of the present invention is to provide an electronic device to solve the problem of low intermediate frequency loudness in existing electronic devices, resulting in poor overall performance and effect.

[0005] The present invention provides an electronic device, comprising a housing having a receiving cavity and a sound-emitting unit disposed in the receiving cavity, wherein the sound-emitting unit divides the receiving cavity into a front cavity and a rear cavity for acoustic isolation, and the housing is provided with a front sound outlet hole for connecting the front cavity with the outside world, and a rear sound outlet hole for connecting the rear cavity with the outside world; wherein,

[0006] The sound unit includes a bracket and a magnetic circuit system and a vibration system connected to the bracket, the magnetic circuit system having a first magnetic gap and a second magnetic gap, the first magnetic gap being arranged around the second magnetic gap; the vibration system includes a first diaphragm and a second diaphragm arranged on opposite sides of the magnetic circuit system, and a first voice coil and a second voice coil respectively connected to the first diaphragm and the second diaphragm, the first voice coil being located in the first magnetic gap, and the second voice coil being located in the second magnetic gap;

[0007] The sound-emitting unit has a first side and a second side that are opposite to each other along the vibration direction of the vibration system, the first side is connected to the front cavity, and the second side is connected to the rear cavity; an air flow channel for the air flow of the second diaphragm is provided between the magnetic circuit system and the first diaphragm, and the sound waves of the second diaphragm facing the first side are radiated outward through the air flow channel and radiated toward the first side together with the sound waves of the first diaphragm facing the first side; the sound waves of the first diaphragm facing the second side and the sound waves of the second diaphragm facing the second side are radiated toward the second side together; and

[0008] The rear sound outlet includes a rear positive sound outlet arranged opposite to the second diaphragm, and the ratio of the area of ​​the rear positive sound outlet to the effective radiation area of ​​the second diaphragm is 5%-100%.

[0009] Preferably, the ratio of the area of ​​the rear positive sound outlet to the effective radiation area of ​​the second diaphragm is 10%-23%;

[0010] And / or, the second diaphragm includes a second reinforcement portion and a third fold disposed around the second reinforcement portion, the second reinforcement portion is connected to an inner connection portion of the third fold, the second voice coil is connected to the second reinforcement portion, and in the vibration direction of the vibration system, a distance between a surface of the inner connection portion facing away from the second reinforcement portion and an inner wall of the housing having the rear positive sound outlet is 0.7-1.1 mm;

[0011] And / or, a rear sound outlet hole communicating with the rear cavity is further provided on the side surface of the shell, and the rear sound outlet hole and the rear front sound outlet hole are located on different surfaces of the shell;

[0012] And / or, the number of the rear positive sound outlet holes is at least two, and the rear positive sound outlet holes are evenly spaced.

[0013] Preferably, the first diaphragm includes a first fold, a second fold located outside the first fold, and a first reinforcement portion provided between the first fold and the second fold, the first reinforcement portion being connected to the first voice coil, the first fold surrounding the air flow channel, and the inner edge of the first fold being connected to the magnetic circuit system;

[0014] And / or, the second diaphragm includes a second reinforcement portion and a third fold ring arranged around the second reinforcement portion, the second reinforcement portion is arranged at the center of the third fold ring portion, the outer edge of the third fold ring portion is connected to the bracket, and the second voice coil is connected to the second reinforcement portion.

[0015] Preferably, the magnetic circuit system includes a magnetic yoke, a central magnetic circuit and a side magnetic circuit arranged on the magnetic yoke; wherein,

[0016] The magnetic yoke includes a central yoke plate, a side yoke plate located outside the central yoke plate, and a connecting piece connecting the central yoke plate and the side yoke plate. The central yoke plate and the side yoke plate are not coplanar. The central magnetic circuit is arranged on the central yoke plate and forms the second magnetic gap between the central magnetic circuit and the side yoke plate. The side magnetic circuit is arranged on the side yoke plate and forms the first magnetic gap between the central yoke plate. The airflow channel passes through the central yoke plate, the central magnetic circuit and the first diaphragm.

[0017] Preferably, the center yoke plate has an extension portion that bends and extends in a direction close to the first diaphragm, the extension portion is connected to the inner edge of the first diaphragm, and the air flow channel includes a first through hole passing through the center magnetic circuit, a second through hole passing through the center yoke plate, and a third through hole passing through the first diaphragm.

[0018] Preferably, the central area of ​​the central yoke plate protrudes toward the central magnetic circuit to form a protrusion, and the protrusion is connected to the central magnetic circuit. A first front cover is provided on the side of the central yoke plate close to the first diaphragm, and the first front cover is connected to the inner edge of the first diaphragm. The air flow channel includes a first through hole passing through the central magnetic circuit, a second through hole passing through the central yoke plate, a third through hole passing through the first diaphragm, and a fourth through hole passing through the first front cover.

[0019] Preferably, a first space is defined between the first front cover and the center yoke plate, and the airflow channel further comprises a fifth through hole extending through the center yoke plate, the fifth through hole being located outside the raised portion, and two sides of the fifth through hole being connected to the second magnetic gap and the first space, respectively.

[0020] And / or, the first front cover includes a top plate, a connecting plate provided at a periphery of the top plate, and a bottom plate formed by extending outward from one end of the connecting plate away from the top plate, the bottom plate being connected to a side of the central yoke plate facing away from the central magnetic circuit, the top plate being provided with the fourth through hole, and the inner periphery of the first diaphragm being connected to the top plate;

[0021] And / or, a connection area between the central magnetic circuit and the central yoke plate is S1, an area of ​​a surface of the central magnetic circuit facing the central yoke plate is S, and S1:S≥50%.

[0022] Preferably, a first cavity is formed between the bracket, the first diaphragm and the magnetic circuit system, and the bracket is provided with a first leakage hole communicating with the first cavity, so that the sound waves of the first diaphragm facing the second side are radiated to the rear cavity through the first leakage hole;

[0023] And / or, a second front cover is provided on a side of the first diaphragm facing away from the second diaphragm, and the second front cover is provided with a first sound outlet hole communicating with the front cavity;

[0024] And / or, a rear cover is provided on a side of the second diaphragm facing away from the first diaphragm, and the rear cover is provided with a second sound outlet hole communicating with the rear cavity.

[0025] Preferably, the central magnetic circuit includes a central magnet and a central magnetic conductive plate, the central magnet is connected to the central yoke plate, the side magnetic circuit includes side magnets and side magnetic conductive plates, the side magnets are connected to the side yoke plates, the second magnetic gap is formed between the central magnetic conductive plate and the side yoke plates, and the first magnetic gap is formed between the side magnetic conductive plates and the central yoke plates;

[0026] Alternatively, the central yoke plate, the side yoke plate, and the connecting piece are an integrally formed structure;

[0027] Alternatively, the connecting member is a permanent magnet.

[0028] Preferably, the first diaphragm and the second diaphragm vibrate in the same direction, the first diaphragm and the second diaphragm radiate first sound waves toward the first side, and the first diaphragm and the second diaphragm radiate second sound waves toward the second side, and the first sound wave and the second sound wave have opposite phases.

[0029] From the above technical solution, it can be seen that the electronic device provided by the present invention increases the effective radiation area of ​​the vibration system and improves the volume of the electronic device by using a sound-emitting unit with a double-sided diaphragm, and the first side of the double-sided diaphragm of the sound-emitting unit emits sound together toward the front cavity, and the second side emits sound together toward the rear cavity; at the same time, a rear positive sound outlet is provided in the direction of the vibration system facing the housing of the electronic device. Compared with the traditional rear cavity side sound outlet, the length of the acoustic pipe is shortened, the sound quality of the rear cavity is reduced, and the mid-frequency loudness is improved.

[0030] In order to achieve the above and related purposes, one or more aspects of the present invention include the features that will be described in detail later. The following description and the accompanying drawings describe some exemplary aspects of the present invention in detail. However, these aspects indicate only some of the various ways in which the principles of the present invention can be used. In addition, the present invention is intended to include all of these aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] By referring to the following description in conjunction with the accompanying drawings, and with a more complete understanding of the present invention, other objects and results of the present invention will become more clear and easy to understand. In the accompanying drawings:

[0032] Figure 1 is a cross-sectional view of an electronic device according to a first embodiment of the present invention;

[0033] Figure 2 is a cross-sectional view of an electronic device according to a second embodiment of the present invention;

[0034] Figure 3 Schematic diagram of the front sound outlet of an electronic device according to an embodiment of the present invention;

[0035] Figure 4 Schematic diagram of an electronic device with a rear front sound outlet and a rear side sound outlet according to an embodiment of the present invention;

[0036] Figure 5 Schematic diagram of an electronic device having two rear front sound outlets and a rear side sound outlet according to an embodiment of the present invention;

[0037] Figure 6 A schematic diagram of a structure of an electronic device with a rear positive sound outlet according to an embodiment of the present invention;

[0038] Figure 7 Schematic diagram of the explosion structure of the sound-emitting unit according to the first embodiment of the present invention;

[0039] Figure 8 A cross-sectional view of a sound-emitting unit according to embodiment 1 of the present invention;

[0040] Figure 9 Schematic diagram of the explosion structure of a sound-emitting unit according to the second embodiment of the present invention;

[0041] Figure 10 A cross-sectional view of a sound-emitting unit according to embodiment 2 of the present invention;

[0042] Figure 11 is a sensitivity curve diagram of different opening ratios according to an embodiment of the present invention.

[0043] The reference numerals include: 1, first diaphragm, 11, first fold ring, 12, second fold ring, 13, first reinforcement part, 14, central dust screen,

[0044] 2. Second diaphragm, 21. Third fold, 22. Second reinforcement,

[0045] 3. First voice coil, 4. Second voice coil, 41. First magnetic gap, 42. Second magnetic gap,

[0046] 5. Magnetic circuit system, 51. Side magnetic plate, 52. Center magnet, 53. Center magnetic plate, 54. Side magnet, 55. Magnetic yoke, 551. Center yoke plate, 552. Side yoke plate, 553. Magnetic yoke plate, 554. Extension, 555. Raised portion, 56. First front cover, 561. Top plate, 562. Connecting plate, 563. Bottom plate, 57. Second front cover, 571. First sound outlet, 20. Magnet,

[0047] 30. Air flow channel, 31. First through hole, 32. Second through hole, 33. Third through hole, 34. Fourth through hole, 35. Fifth through hole, 36. First space;

[0048] 61. First bracket, 62. Second bracket, 63. First leakage hole, 64. Border dust screen,

[0049] 71. First positioning ring, 72. Second positioning ring,

[0050] 8. Back cover, 81. Second sound hole,

[0051] 9. Shell, 91. Front sound outlet, 92. Rear sound outlet, 93. Rear side sound outlet, 96. Front cavity, 97. Rear cavity.

[0052] The same reference numerals throughout the drawings indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0053] In the following description, for illustrative purposes, numerous specific details are set forth to provide a comprehensive understanding of one or more embodiments. However, it will be apparent that the embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form to facilitate description of one or more embodiments.

[0054] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0055] In order to solve the aforementioned problem of low mid-frequency loudness in existing electronic devices, resulting in poor overall performance and effect, the present invention proposes an electronic device, wherein the electronic device can be a mobile phone, headphones, smart wearable device, etc., which is not limited here.

[0056] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0057] To illustrate the structure of the electronic device provided by the present invention, Figures 1 to 10 The structures of the electronic device and the sound unit are illustrated from different angles. Figure 1shows a cross-sectional structure of an electronic device according to a first embodiment of the present invention; Figure 2 shows a cross-sectional structure of an electronic device according to a second embodiment of the present invention; Figure 3 The front sound outlet structure of an electronic device according to an embodiment of the present invention is shown; Figure 4 The electronic device according to an embodiment of the present invention is shown to have a rear front sound outlet and a rear side sound outlet structure; Figure 5 The electronic device according to an embodiment of the present invention is shown to have two rear front sound outlets and a rear side sound outlet structure; Figure 6 A schematic diagram of a structure of an electronic device with a rear positive sound outlet according to an embodiment of the present invention is shown; Figure 7 The explosion structure of the sound-emitting monomer according to the first embodiment of the present invention is shown; Figure 8 The cross-sectional structure of the sound-emitting unit according to the first embodiment of the present invention is shown; Figure 9 The explosion structure of the sound-emitting monomer according to the second embodiment of the present invention is shown; Figure 10 The cross-sectional structure of the sound-emitting unit according to the second embodiment of the present invention is shown; Figure 11 The sensitivity of different opening ratios according to an embodiment of the present invention is shown.

[0058] like Figures 1 to 11 As shown together, the present invention provides an electronic device, including a shell 9 with a receiving cavity and a sound-emitting unit arranged in the receiving cavity, the sound-emitting unit divides the receiving cavity into a front cavity 96 and a rear cavity 97 for acoustic isolation, and the shell 9 is provided with a front sound outlet 91 connecting the front cavity 96 with the outside world, and a rear sound outlet connecting the rear cavity 97 with the outside world; the sound-emitting unit includes a bracket and a magnetic circuit system 5 and a vibration system connected to the bracket, the magnetic circuit system 5 has a first magnetic gap 41 and a second magnetic gap 42, and the first magnetic gap 41 is arranged around the second magnetic gap 42; the vibration system includes a first diaphragm 1 and a second diaphragm 2 arranged on opposite sides of the magnetic circuit system 5, and a first voice coil 3 and a second voice coil 4 respectively connected to the first diaphragm 1 and the second diaphragm 2, and the first voice coil 3 is located at the first magnetic In the gap 41, the second voice coil 4 is located in the second magnetic gap 42; the sound-emitting unit has a first side and a second side that are opposite to each other along the vibration direction of the vibration system, the first side is connected to the front cavity 96, and the second side is connected to the rear cavity 97; an air flow channel 30 for the air flow of the second diaphragm 2 to flow out is provided between the magnetic circuit system 5 and the first diaphragm 1, and the sound waves of the second diaphragm 2 facing the first side are radiated outward through the air flow channel 30 and radiated toward the first side together with the sound waves of the first diaphragm 1 facing the first side; the sound waves of the first diaphragm 1 facing the second side and the sound waves of the second diaphragm 2 facing the second side are radiated toward the second side together; and the rear sound hole includes a rear positive sound hole 92 arranged opposite to the second diaphragm, and the ratio of the area of ​​the rear positive sound hole 92 to the effective radiation area of ​​the second diaphragm 2 is 5%-100%.

[0059] In an embodiment of the present invention, the vibration system of the sounding unit has a first diaphragm 1 and a second diaphragm 2, which increases the effective radiation area of ​​the vibration system. The sound waves of the first diaphragm 1 and the second diaphragm 2 are radiated outward on the same side of the sounding unit, which is conducive to the superposition of compressed air when the first diaphragm 1 and the second diaphragm 2 vibrate, thereby improving the loudness and sensitivity of the sounding unit. The electronic device adopts the sounding unit to improve the acoustic performance of the electronic device; by installing the sounding unit in the receiving cavity of the shell 9 of the electronic device, the receiving cavity is divided into a front cavity 96 and a rear cavity that are isolated from each other. 97, and the sound waves on the first side of the first diaphragm 1 and the second diaphragm 2 are radiated toward the front cavity 96, and the sound waves on the second side are radiated toward the rear cavity 97. The shell 9 is provided with a front sound outlet 91 connected to the front cavity 96 and a rear sound outlet connected to the rear cavity 97, and the rear sound outlet includes a rear positive sound outlet 92 facing the second diaphragm 2. Compared with traditional electronic devices that only have side sound outlets connected to the rear cavity, the design of the rear positive sound outlet 92 in this application shortens the acoustic pipe length of the rear cavity sound waves, reduces the sound quality of the rear cavity, and improves the mid-frequency loudness. Furthermore, the ratio of the area of ​​the rear positive sound outlet 92 to the effective radiation area of ​​the second diaphragm 2 is 5%-100%, specifically 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%, further enhancing the smoothness of the airflow in the rear cavity and further improving the mid-frequency response of the electronic device.

[0060] The shape of the shell 9 can be circular or cylindrical. In specific applications, a suitable shape can be selected according to actual needs. No specific limitation is made here, as long as it is compatible with the sound unit.

[0061] In the embodiment of the present invention, the ratio of the area of ​​the rear positive sound outlet 92 to the effective radiation area of ​​the second diaphragm 2 is the aperture ratio of the rear positive sound outlet 92. Figure 11In a simulation experiment, loudness (sensitivity) curves were set for electronic devices with different aperture ratios. The curves show a significant increase between 5% and 10% and between 10% and 23% aperture ratios, while the curves between 23% and 50% and between 50% and 100% aperture ratios show little change, remaining almost identical. Analysis reveals that in the mid-frequency (200Hz-3kHz) range, when the aperture ratio of the rear positive sound outlet is 5%, the mid-frequency loudness is low, and the acoustic performance is poor. When the aperture ratio of the rear positive sound outlet is 10%, the mid-frequency loudness is improved by more than 3dB compared to 5%, meeting the requirements for electronic device use. A smaller aperture ratio also provides aesthetic appeal. When the aperture ratio of the rear positive sound outlet is 23%, the mid-frequency loudness reaches an even better state, further improving the acoustic performance of the entire device. Furthermore, when the aperture ratio of the rear positive sound outlet 92 is further increased from 50% to 100%, the mid-frequency loudness changes little. It can be seen from this that the ratio of the area of ​​the rear positive sound outlet 92 to the effective radiation area of ​​the second diaphragm 2 is in the optimal range of 10%-23%. When the aperture ratio is 10%, the performance of the electronic device is improved and can meet the use requirements. At the same time, a smaller aperture ratio can meet the aesthetic requirements of the entire device. When the aperture ratio is 23%, the performance of the electronic device basically reaches the optimal state, and the aperture ratio is not too large. When the aperture ratio is greater than 23%, the performance of the electronic device remains at the optimal state. The aperture ratio can be set according to the needs of the designer and user.

[0062] According to the above simulation experimental data, it can be further limited that the ratio of the area of ​​the rear positive sound outlet 92 to the effective radiation area of ​​the second diaphragm 2 is in the range of 10%-23%. According to the actual situation of the earphone, the preferred opening rate is any value between 10% and 23%, etc. On the basis of meeting its acoustic performance, the appropriate opening rate is set according to the actual situation, and is not limited to the above-mentioned requirements.

[0063] In the embodiment of the present invention, since the rear positive sound outlet 92 faces the second diaphragm 2, the second side sound waves of the first diaphragm 1 and the second diaphragm 2 can be smoothly radiated to the outside through the rear positive sound outlet 92, thereby reducing the acoustic quality of the rear cavity 97, reducing the length of the acoustic duct, that is, the distance between the rear positive sound outlet 92 and the second diaphragm 2, and further reducing the thickness of the electronic device. To ensure acoustic performance and the requirements of overall miniaturization, the distance d between the rear positive sound outlet 92 and the second diaphragm 2 must meet the requirement of +0.4mm based on the amplitude of the second diaphragm 2. In addition, the second diaphragm 2 includes a second reinforcement portion 22 and a third fold 21 disposed around the second reinforcement portion 22. The second reinforcement portion 22 is connected to the inner connection portion of the third fold 21, and the second voice coil 4 is connected to the second reinforcement portion 22. In the vibration direction of the vibration system, the distance between the surface of the inner connection portion of the second diaphragm 2 facing away from the second reinforcement portion 22 and the inner wall of the housing 9 having the rear positive sound outlet 92 is 0.7-1.1mm. In a specific embodiment, the smaller the distance between the rear positive sound outlet 92 and the second diaphragm 2 is, the smaller the thickness of the electronic device is.

[0064] in, Figure 1 、 Figure 2 Electronic devices with different sound-emitting monomer structures are shown. Double-sided sound-emitting monomers with different structures are installed in the receiving cavity of the housing 9 of the electronic device according to needs. Figure 3 The position structure of the front sound hole 91 is shown. The front sound hole 91 corresponds to the first diaphragm 1 (double-fold diaphragm). The front sound hole 91 adopts a fan-shaped ring shape.

[0065] In one embodiment, a rear sound outlet hole 93 communicating with the rear cavity 97 is further provided on the side of the shell 9 . The rear sound outlet hole 93 and the rear front sound outlet hole 92 are located on different surfaces of the shell 9 .

[0066] like Figure 4 As shown, a rear positive sound outlet 92 and a rear side sound outlet 93, both communicating with the rear cavity 97, are provided on two different surfaces of the housing 9. Specifically, a circular rear positive sound outlet 92 is provided at a position corresponding to the center of the housing 9 and the second diaphragm 2; a strip-shaped rear side sound outlet 93 is also provided on the side of the housing 9, communicating with the rear cavity 97. The strip-shaped rear side sound outlet 93 is located on a different surface of the housing 9 from the rear positive sound outlet 92.

[0067] In the embodiment of the present invention, the number of the rear positive sound outlet holes 92 is at least two, and the rear positive sound outlet holes 92 are evenly spaced. Figure 5As shown, the housing 9 is provided with two rear positive sound outlets 92 and one rear side sound outlet 93. Specifically, two semicircular rear positive sound outlets 92 are provided at the edge of the housing 9 corresponding to the second diaphragm 2, and the two rear positive sound outlets 92 are spaced apart. A rear side sound outlet 93 is provided on the side of the housing 9, and the rear side sound outlet 93 has a strip-shaped structure. In specific applications, a different number of rear positive sound outlets 92 can be provided as needed.

[0068] In other embodiments, Figure 6 As shown, there is only one rear sound hole on the shell 9, that is, only a circular rear positive sound hole 92 is provided at the position corresponding to the shell 9 and the second diaphragm 2, that is, there is no rear side sound hole connected to the rear cavity 97 on the side of the shell 9.

[0069] comprehensive Figures 1 to 6 On the basis of setting the rear positive sound outlet 92 on the shell 9, a rear side sound outlet 93 can be set on the side of the shell 9 as needed. It should be noted that the shape and number of the rear positive sound outlet 92 are not specifically limited here. The appropriate shape and number can be selected according to needs, as long as the opening rate of the rear positive sound outlet 92 is 5%-100%.

[0070] In an embodiment of the present invention, the first diaphragm 1 and the second diaphragm 2 vibrate in the same direction, and the first diaphragm 1 and the second diaphragm 2 radiate the first sound wave to the first side through the front sound outlet 91, and the first diaphragm 1 and the second diaphragm 2 radiate the second sound wave to the second side through the rear positive sound outlet 92 and / or the rear side sound outlet 93, and the first sound wave and the second sound wave are in opposite phases. By vibrating the first diaphragm 1 and the second diaphragm 2 in the same direction, the sound waves of the first diaphragm 1 and the second diaphragm 2 in the vibration system can be superimposed and sounded, thereby improving the sound effect and performance of the sound-emitting unit; the first sound wave of the front cavity 96 and the second sound wave of the rear cavity 97 are in opposite phases, the sound wave of the front cavity 96 is radiated to the outside through the front sound outlet 91, and the sound wave of the rear cavity 97 is radiated to the outside through the rear sound outlet, which can achieve the technical effect of the acoustic dipole, achieve the effect of far-field sound elimination, and protect the privacy of the user during use.

[0071] In the embodiment of the present invention, the specific structure of the sound unit can be set according to the actual situation. Figures 7 to 10In the illustrated embodiment, the sound-generating unit includes brackets (a first bracket 61 and a second bracket 62); a magnetic circuit system 5 and a vibration system. The brackets are used to mount, secure, and support the magnetic circuit system 5, the vibration system, and other components. In other words, the brackets provide a mounting base for the magnetic circuit system 5, the vibration system, and other components. Optionally, the housing 1 can be a single, integral structure or comprised of multiple separate components, without limitation. The bracket in this embodiment can be selected as a frame or a frame structure, that is, the bracket has a cavity with openings at both ends, the magnetic circuit system 5 is accommodated in the cavity of the bracket and connected to the bracket, the first diaphragm 1 and the second diaphragm 2 of the vibration system are respectively arranged on opposite sides of the magnetic circuit system 5, and the outer periphery of the first diaphragm 1 and the outer periphery of the second diaphragm 2 are respectively connected to the two ends of the bracket, thus forming a dual diaphragm structure, so that one magnetic circuit system 5 is used to drive the two voice coils (first voice coil 3 and second voice coil 4) of the vibration system to drive the two diaphragms (first diaphragm 1 and second diaphragm 2) to vibrate and achieve sound, and at the same time, the double-sided diaphragms can achieve unidirectional sound without increasing the external dimensions, and the vibration area of ​​the vibration system is increased, thereby achieving the purpose of improving performance.

[0072] Optionally, the bracket is cylindrical, with the outer contours of the first diaphragm 1 and the second diaphragm 2 roughly aligned, facilitating the regularized design of the sound unit's outer shape, further facilitating assembly within the electronic device's housing 9 and simplifying the overall device's pre-requisite structure. Further optionally, the bracket includes a cylindrical first bracket 61 and a cylindrical second bracket 62, which are adapted to connect to form the cylindrical bracket. The bracket is designed to be divided into a first bracket 61 and a second bracket 62, allowing the first diaphragm 1 to be assembled via the first bracket 61 and the second diaphragm 62 to be assembled via the second bracket 62, facilitating assembly of the sound unit during assembly. Conductive terminals can also be provided on the first bracket and the second bracket, respectively, to facilitate electrical connection of the first voice coil 3 and the second voice coil 4 to external circuits.

[0073] In an embodiment of the present invention, the first diaphragm 1 and the second diaphragm 2 vibrate in the same direction, the first diaphragm 1 and the second diaphragm 2 radiate the first sound wave to the first side, and the first diaphragm 1 and the second diaphragm 2 radiate the second sound wave to the second side, and the first sound wave and the second sound wave are opposite in phase; by the first diaphragm 1 and the second diaphragm 2 vibrating in the same direction, the sound waves of the first diaphragm 1 and the second diaphragm 2 in the vibration system can be superimposed and sounded, thereby improving the sound effect and performance of the sound-emitting unit; the first sound wave in the front cavity 96 and the second sound wave in the rear cavity 97 are opposite in phase, the sound wave in the front cavity 96 is radiated to the outside through the front sound outlet 91, and the sound wave in the rear cavity 97 is radiated to the outside through the rear sound outlet, which can realize the technical effect of acoustic dipole, achieve the effect of far-field sound elimination, and protect the privacy of the user during use. In an embodiment of the present invention, an air flow channel 30 is provided between the magnetic circuit system 5 and the first diaphragm 2 for the air flow of the second diaphragm 2 to flow out, thereby facilitating the sound waves of the second diaphragm 2 facing the first side to radiate outward through the air flow channel 30 and radiate toward the first side together with the sound waves of the first diaphragm surface 1 toward the first side; in this way, the sound waves of the first diaphragm 1 and the second diaphragm 2 are superimposed, thereby improving their loudness and sensitivity.

[0074] The first diaphragm 1 includes an inner first fold 11, an outer second fold 12, and a first reinforcement portion 13 disposed between the first fold 11 and the second fold 12. The first reinforcement portion 13 is connected to the first voice coil 3. The first fold 11 surrounds the airflow channel 30, and the inner edge of the first fold 11 is connected to the magnetic circuit system 5. Specifically, in this embodiment of the present invention, by configuring the first diaphragm 1 as a double-fold structure, the vibration of the first voice coil 3 facilitates the vibration of the first diaphragm 1, while also improving the compliance of the first diaphragm 1 and enhancing its high-frequency performance.

[0075] In the present invention, the magnetic circuit system 5 includes a yoke 55, a central magnetic circuit and a side magnetic circuit provided on the yoke 55, wherein the yoke 55 includes a central yoke plate 551, a side yoke plate 552 located outside the central yoke plate 551, and a connector connecting the central yoke plate 551 and the side yoke plate 552, wherein the central yoke plate 551 and the side yoke plate 552 are not coplanar, and the magnetic conductive yoke plate 553 connects the central yoke plate 551 and the side yoke plate 552, and the central magnetic circuit is provided on the central yoke plate 551 and is connected to the side yoke plate 552. 52, a second magnetic gap 42 is formed between the side magnetic circuit and the center yoke plate 551, the side magnetic circuit is arranged on the side yoke plate 552 and forms a first magnetic gap 41 with the center yoke plate 551, and the air flow channel 30 passes through the center yoke plate 551, the center magnetic circuit and the first diaphragm 1; wherein, the formed air flow channel 30 effectively increases the air flow area when the second diaphragm 2 vibrates, thereby ensuring smoother air flow, improving the mid-frequency loudness performance of the second diaphragm 2, and thus improving the mid-frequency loudness performance after the first diaphragm 1 and the second diaphragm 2 are superimposed.

[0076] Specifically, the central magnetic circuit includes a central magnet 52 and a central magnetic conductive plate 53, and the side magnetic circuit includes a side magnet 54 and a side magnetic conductive plate 51. The side magnet 54 is connected to the side yoke plate 552. A second magnetic gap 42 is formed between the central magnetic conductive plate 53 and the side yoke plate 552, and a first magnetic gap 41 is formed between the side magnetic conductive plate 51 and the central yoke plate 551. In the embodiment shown in the present invention, the central yoke plate 551, the side yoke plate 552, and the connecting piece are an integrally formed structure; alternatively, the connecting piece is designed as a permanent magnet. In application, the appropriate structural form can be rotated according to actual needs.

[0077] In the first embodiment, the center yoke plate 551 has an extension portion 554 that bends and extends toward the first diaphragm 1. The extension portion 554 is connected to the inner edge of the first diaphragm 1, specifically to the inner edge of the first surround 11. The integral molding of the extension portion 554 and the inner edge of the first diaphragm 1 within the center yoke plate 551 helps simplify the number of components and improve positioning accuracy during assembly. The airflow channel 30 includes a first through-hole 31 extending through the central magnetic circuit, a second through-hole 32 extending through the center yoke plate 551, and a third through-hole 33 extending through the first diaphragm 1. Specifically, sound waves from the second diaphragm 2 facing the first side are radiated outward through the first through-hole 31, the second through-hole 32, and the third through-hole 33, and are radiated toward the first side together with the sound waves from the first diaphragm 1 facing the first side, thereby enhancing the mid-frequency loudness of the combined sound of the first and second diaphragms 1 and 2.

[0078] In the second embodiment, the central region of the center yoke plate 551 protrudes toward the central magnetic circuit to form a raised portion 555, which is connected to the central magnetic circuit. Furthermore, a second through hole 32 is formed at the center of the raised portion 555 and communicates with the first through hole 31 of the central magnetic circuit. By providing the raised portion 555 on the center yoke plate 551 with the connection to the central magnetic circuit, the structural strength of the center yoke plate 551 and the connection area between the center magnetic circuit and the center yoke plate 551 can be ensured, thereby improving the stability of the magnetic circuit structure. Optionally, the connection area between the center magnetic circuit and the center yoke plate 551 is S1, and the area of ​​the surface of the center magnetic circuit facing the center yoke plate 551 is S, where S1:S≥50%.

[0079] Optionally, the opening area of ​​the second through hole 32 accounts for 10% to 80% of the area of ​​the center yoke plate 551. Specifically, it can be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, etc., which is not limited here.

[0080] It is understandable that if the area of ​​the second through hole 32 is too small, it is not conducive to the radiation of the sound waves of the second diaphragm 2 to the outside world; if the area of ​​the second through hole 32 is too large, the bonding area between the central magnetic circuit and the protrusion 555 is too small, which is not conducive to improving the connection reliability between the two.

[0081] In an embodiment of the present invention, a first front cover 56 is provided on the side of the center yoke plate 551 proximal to the first diaphragm 1. The first front cover 56 is connected to the inner edge of the first diaphragm 1. The airflow channel 30 includes a first through-hole 31 extending through the central magnetic circuit, a second through-hole 32 extending through the center yoke plate 551, a third through-hole 33 extending through the first diaphragm 1, and a fourth through-hole 34 extending through the first front cover 56. The first front cover 56 is used to connect and secure the first diaphragm 1 and the center yoke plate 551, freeing up the external design of the center yoke plate 551 and allowing it to be bent in the opposite direction to connect to the central magnetic circuit, improving installation stability and thus reducing reliability risks. At this point, the sound waves from the second diaphragm 2 radiate toward the first side through the first through-hole 31, the second through-hole 32, the fourth through-hole 34, and the third through-hole 33.

[0082] Furthermore, a first space 36 is defined between the first front cover 56 and the center yoke plate 551. The airflow channel 30 also includes a fifth through-hole 35 extending through the center yoke plate 551. The fifth through-hole 35 is located outside the raised portion 551. The second magnetic gap 42 and the first space 36 are connected on either side of the fifth through-hole 35. Sound waves from the second diaphragm 2 are further radiated toward the first side through the fifth through-hole 35, the first space 36, the fourth through-hole 34, and the third through-hole 33. The connection between the second magnetic gap 42 and the first space 36 by the fifth through-hole 35 ensures smooth airflow within the magnetic gap beneath the second diaphragm 2, improving the high-frequency performance of the second diaphragm 2.

[0083] Among them, the first front cover 56 includes a top plate 561, a connecting plate 562 arranged on the periphery of the top plate 561, and a bottom plate 563 formed by extending outward from one end of the connecting plate 562 away from the top plate 561. The bottom plate 563 is connected to the side of the center yoke plate 551 facing away from the center magnetic circuit. The top plate 561 is provided with a fourth through hole 34. The inner periphery of the first diaphragm 1 is connected to the top plate 561. The sound waves of the first diaphragm 1 and the second diaphragm 2 are radiated to the outside through the fourth through hole 34.

[0084] In Example 1 ( Figure 7 and Figure 8 ), the extension portion 554 and the center yoke plate 551 are integrally formed. Figure 9 and Figure 10 ), the center yoke plate 551 and the first front cover 56 can be an integrally formed structure or a split structure, the first front cover 56 includes a top plate 561, a connecting plate 562 and a bottom plate 563, the fourth through hole 34 is opened on the top plate 561, and is connected to the first diaphragm 1, and the bottom plate 563 is connected and fixed to the center yoke plate 551; in specific applications, the appropriate design structure can be selected according to actual conditions, and is not limited to any of the above methods.

[0085] In addition, in embodiment 2, a central dustproof net 14 is provided on the third through hole 33 of the first diaphragm 1, and a side dustproof net 64 is provided on the edge of the first bracket 61. The dustproof net is provided to prevent external dust or impurities from entering the interior of the sound-emitting unit, thereby avoiding affecting the acoustic performance of the electronic device.

[0086] In an embodiment of the present invention, the second diaphragm 2 includes a second reinforcement portion 22 and a third fold ring 21 arranged around the second reinforcement portion 22. The second reinforcement portion 22 is arranged at the center of the third fold ring 21. The outer edge of the third fold ring 21 is connected to the bracket, and the second voice coil 4 is connected to the second reinforcement portion 22. The second reinforcement portion 22 and the third fold ring 21 of the second diaphragm 2 can be an integrally formed structure or a separate structure, which is not limited here. It can be understood that the third fold ring 21 of the second diaphragm 2 is a convex structure that protrudes upward or a concave structure that is concave downward, which is not limited here. Optionally, the third fold ring 21 protrudes in a direction away from the magnetic circuit system 5.

[0087] Among them, the outer edge of the third fold ring 21 is connected to the bracket, and the second voice coil 4 is connected to the second reinforcement part 22. In this way, when the second voice coil 4 vibrates, it drives the second diaphragm 2 to vibrate, so that the sound waves of the second diaphragm 2 radiate sound waves outward along the second magnetic gap 42, the fifth through hole 35, the first through hole 31, the second through hole 32, the third through hole 33 and the fourth through hole 34 to the first side.

[0088] In embodiment one, a first cavity is formed between the first diaphragm 1, the bracket, and the magnetic circuit system 5. The first cavity is a closed cavity. A first leakage hole 63 connecting the first cavity and the outside is provided on the sound-emitting unit. The sound waves facing the second side of the first diaphragm 1 are radiated to the rear cavity 97 through the first leakage hole 63, that is, the first cavity is a closed cavity, and the first cavity is connected to the rear cavity 97 only through the first leakage hole 63.

[0089] In addition, there are multiple first leakage holes 63, and the multiple first leakage holes 63 are symmetrically arranged along the circumference of the sound unit. Optionally, the central magnetic circuit includes a central magnet 52 and a central magnetic plate 53, and the side magnetic circuit includes a side magnet 54 and a side magnetic plate 51. A second magnetic gap is formed between the central magnetic plate 53 and the side yoke plate 552, and a first magnetic gap is formed between the side magnetic plate 51 and the central yoke plate 551. The side magnetic plate 51 is injection molded on the bracket, and the first leakage holes 63 are formed by removing material from the side magnetic plate 51 and the corresponding bracket area. In an embodiment of the present invention, by removing material from the side magnetic plate 51 and the bracket, the first leakage holes 63 do not occupy additional radial dimensions of the sound unit, thereby maximizing the radial dimensions of the sound unit, or the size of the leakage holes can be increased within the limited size of the sound unit to balance the internal pressure.

[0090] In embodiment two, a second front cover 57 is provided on the side of the first diaphragm 1 facing away from the second diaphragm 2. The second front cover 57 is used to protect the first diaphragm 1. A first sound outlet hole 571 connected to the front cavity is provided on the second front cover 57. The first diaphragm 1 radiates sound waves outward through the first sound outlet hole 571, and the second diaphragm 1 radiates sound waves toward the first side through the air flow channel 30 and the first sound outlet hole 571.

[0091] In the first embodiment, the sound-emitting unit further includes a rear cover 8, which is located on the side of the second diaphragm 2 away from the first diaphragm 1. The rear cover 8 is provided with a second sound outlet 81 connected to the rear cavity 97. The second diaphragm 2 radiates sound waves to the second side through the second sound outlet 81, and the first diaphragm 1 radiates sound waves to the second side through the airflow channel 30 and the second sound outlet 81. The rear cover 8 is made of metal, which provides strong support for the sound-emitting unit during assembly and reduces the overall size of the unit. In specific applications, the appropriate number of leakage holes is set based on actual conditions and is not limited to a fixed number.

[0092] Furthermore, in embodiments of the present invention, positioning rings may be provided between the second edge 12, the third edge 22, and the bracket, and between the first edge 11 and the support 10. Specifically, the positioning rings may be steel rings. Specifically, a first positioning ring 71 is provided between the second edge 12 and the bracket, and a second positioning ring 72 is provided between the third edge 22 and the bracket. The use of positioning rings facilitates handling of the first diaphragm 1 or the second diaphragm 2 during assembly, while also improving assembly precision and enhancing the performance of the speaker units.

[0093] It can be seen from the above embodiments that the electronic device provided by the present invention increases the effective radiation area of ​​the vibration system and improves the volume of the electronic device by using a sound-emitting unit with a double-sided diaphragm, and the first sides of the double-sided diaphragms of the sound-emitting unit radiate sound waves toward the front cavity 96, and the second sides radiate sound waves toward the rear cavity 97. At the same time, a rear positive sound outlet 92 is provided in the direction of the vibration system facing the electronic device housing 9. Compared with the traditional rear cavity side sound outlet, the length of the acoustic pipe is shortened, the sound quality of the rear cavity is reduced, and the mid-frequency loudness is improved.

[0094] The electronic device according to the present invention has been described above by way of example with reference to the accompanying drawings. However, those skilled in the art will appreciate that various improvements may be made to the electronic device according to the present invention without departing from the scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the contents of the appended claims.

Claims

1. An electronic device comprising a housing having a receiving cavity and a sound-emitting unit disposed in the receiving cavity, characterized in that: The sound-emitting monomer divides the receiving cavity into an acoustically isolated front cavity and a rear cavity, and the shell is provided with a front sound hole connecting the front cavity with the outside world, and a rear sound hole connecting the rear cavity with the outside world; wherein, The sound unit includes a bracket and a magnetic circuit system and a vibration system connected to the bracket, the magnetic circuit system having a first magnetic gap and a second magnetic gap, the first magnetic gap being arranged around the second magnetic gap; the vibration system includes a first diaphragm and a second diaphragm arranged on opposite sides of the magnetic circuit system, and a first voice coil and a second voice coil respectively connected to the first diaphragm and the second diaphragm, the first voice coil being located in the first magnetic gap, and the second voice coil being located in the second magnetic gap; The sound-emitting unit has a first side and a second side that are opposite to each other along the vibration direction of the vibration system, the first side is connected to the front cavity, and the second side is connected to the rear cavity; an air flow channel for the air flow of the second diaphragm is provided between the magnetic circuit system and the first diaphragm, and the sound waves of the second diaphragm facing the first side are radiated outward through the air flow channel and radiated toward the first side together with the sound waves of the first diaphragm facing the first side; the sound waves of the first diaphragm facing the second side and the sound waves of the second diaphragm facing the second side are radiated toward the second side together; and The rear sound outlet includes a rear positive sound outlet arranged opposite to the second diaphragm, and the ratio of the area of ​​the rear positive sound outlet to the effective radiation area of ​​the second diaphragm is 5%-100%.

2. The electronic device according to claim 1, wherein The ratio of the area of ​​the rear positive sound outlet to the effective radiation area of ​​the second diaphragm is 10%-23%; And / or, the second diaphragm includes a second reinforcement portion and a third fold disposed around the second reinforcement portion, the second reinforcement portion is connected to an inner connection portion of the third fold, the second voice coil is connected to the second reinforcement portion, and in the vibration direction of the vibration system, a distance between a surface of the inner connection portion facing away from the second reinforcement portion and an inner wall of the housing having the rear positive sound outlet is 0.7-1.1 mm; And / or, a rear sound outlet hole communicating with the rear cavity is further provided on the side surface of the shell, and the rear sound outlet hole and the rear front sound outlet hole are located on different surfaces of the shell; And / or, the number of the rear positive sound outlet holes is at least two, and the rear positive sound outlet holes are evenly spaced.

3. The electronic device according to claim 1, wherein The first diaphragm includes a first fold, a second fold located outside the first fold, and a first reinforcement portion provided between the first fold and the second fold, the first reinforcement portion being connected to the first voice coil, the first fold surrounding the air flow channel, and the inner edge of the first fold being connected to the magnetic circuit system; And / or, the second diaphragm includes a second reinforcement portion and a third fold ring arranged around the second reinforcement portion, the second reinforcement portion is arranged at the center of the third fold ring portion, the outer edge of the third fold ring portion is connected to the bracket, and the second voice coil is connected to the second reinforcement portion.

4. The electronic device according to claim 1, wherein: The magnetic circuit system includes a magnetic yoke, a central magnetic circuit and a side magnetic circuit arranged on the magnetic yoke; wherein, The magnetic yoke includes a central yoke plate, a side yoke plate located outside the central yoke plate, and a connecting piece connecting the central yoke plate and the side yoke plate. The central yoke plate and the side yoke plate are not coplanar. The central magnetic circuit is arranged on the central yoke plate and forms the second magnetic gap between the central magnetic circuit and the side yoke plate. The side magnetic circuit is arranged on the side yoke plate and forms the first magnetic gap between the central yoke plate. The airflow channel passes through the central yoke plate, the central magnetic circuit and the first diaphragm.

5. The electronic device according to claim 4, characterized in that The center yoke plate has an extension portion that bends and extends in a direction close to the first diaphragm, and the extension portion is connected to the inner edge of the first diaphragm. The air flow channel includes a first through hole passing through the center magnetic circuit, a second through hole passing through the center yoke plate, and a third through hole passing through the first diaphragm.

6. The electronic device according to claim 4, characterized in that The central area of ​​the central yoke plate protrudes toward the central magnetic circuit to form a protrusion, and the protrusion is connected to the central magnetic circuit. A first front cover is provided on the side of the central yoke plate close to the first diaphragm, and the first front cover is connected to the inner edge of the first diaphragm. The air flow channel includes a first through hole passing through the central magnetic circuit, a second through hole passing through the central yoke plate, a third through hole passing through the first diaphragm, and a fourth through hole passing through the first front cover.

7. The electronic device according to claim 6, wherein: A first space is defined between the first front cover and the center yoke plate, the airflow channel further comprising a fifth through hole penetrating the center yoke plate, the fifth through hole being located outside the protruding portion, and two sides of the fifth through hole being connected to the second magnetic gap and the first space, respectively; And / or, the first front cover includes a top plate, a connecting plate provided at a periphery of the top plate, and a bottom plate formed by extending outward from one end of the connecting plate away from the top plate, the bottom plate being connected to a side of the central yoke plate facing away from the central magnetic circuit, the top plate being provided with the fourth through hole, and the inner periphery of the first diaphragm being connected to the top plate; And / or, a connection area between the central magnetic circuit and the central yoke plate is S1, an area of ​​a surface of the central magnetic circuit facing the central yoke plate is S, and S1: S≥50%.

8. The electronic device according to claim 1, wherein: A first cavity is formed between the bracket, the first diaphragm, and the magnetic circuit system. The bracket is provided with a first leakage hole connected to the first cavity, and the sound waves of the first diaphragm facing the second side are radiated to the rear cavity through the first leakage hole. And / or, a second front cover is provided on a side of the first diaphragm facing away from the second diaphragm, and the second front cover is provided with a first sound outlet hole communicating with the front cavity; And / or, a rear cover is provided on a side of the second diaphragm facing away from the first diaphragm, and the rear cover is provided with a second sound outlet hole communicating with the rear cavity.

9. The electronic device according to claim 4, wherein: The central magnetic circuit includes a central magnet and a central magnetic conductive plate, the central magnet is connected to the central yoke plate, the side magnetic circuit includes side magnets and side magnetic conductive plates, the side magnets are connected to the side yoke plates, the second magnetic gap is formed between the central magnetic conductive plate and the side yoke plates, and the first magnetic gap is formed between the side magnetic conductive plates and the central yoke plates; Alternatively, the central yoke plate, the side yoke plate, and the connecting piece are an integrally formed structure; Alternatively, the connecting member is a permanent magnet.

10. The electronic device according to any one of claims 1 to 9, characterized in that: The first diaphragm and the second diaphragm vibrate in the same direction, radiate a first sound wave toward the first side, and radiate a second sound wave toward the second side, and the first sound wave and the second sound wave have opposite phases.

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