Electronic device

Abstract

This invention provides an electronic device, comprising a housing with a receiving cavity and a sound-generating unit disposed within the receiving cavity. The sound-generating unit divides the receiving cavity into a front cavity and a rear cavity. The housing is provided with a front sound outlet and a rear sound outlet. The sound-generating 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 communicates with the front cavity, and the second side communicates with the rear cavity. An airflow channel is provided between the magnetic circuit system and the first diaphragm for the airflow of a second diaphragm. The sound waves of the second diaphragm facing the first side radiate outward through the airflow channel and together with the sound waves of the first diaphragm facing the first side radiate towards 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 radiate together towards the second side. The rear sound outlet includes a rear front sound outlet, and the ratio of the area of ​​the rear front sound outlet to the effective radiation area of ​​the second diaphragm is 5%-100%. This invention can solve the problem of low mid-frequency loudness in existing electronic devices.

Description

Technical Field

[0001] This invention relates to the field of sound generation technology, and more specifically, to an electronic device. Background Technology

[0002] In recent years, with the development of electronic products, electronic devices such as headphones, smartphones, and VR have gained consumer recognition. As the performance of electronic products improves, the improvement of the acoustic performance of sound-producing devices is also an inevitable trend, especially the frequency response of OWS (Open Wearable Stereo) headphones.

[0003] Existing electronic devices (such as OWS headphones) typically have their rear cavity sound outlets located only on the side, resulting in relatively high sound quality. Previously, the vibrational mass of single-diaphragm drivers was relatively large, making them less susceptible to the influence of sound quality. However, as users' demands for mid-frequency loudness in OWS headphones have increased, the effective radiation area (SD) of the vibrational system has become larger, and the vibrational mass has become lighter. The frequency response is now significantly affected by the sound quality of the rear cavity, and the traditional side-mounted sound outlet in the rear cavity is not conducive to improving mid-frequency loudness, leading to poor performance and overall effect of the electronic devices. Summary of the Invention

[0004] In view of the above problems, the purpose of this invention is to provide an electronic device to solve the problem of low mid-frequency loudness in existing electronic devices, which leads to poor overall performance and effect.

[0005] This invention provides an electronic device, including a housing with a receiving cavity and a sound-emitting unit disposed within the receiving cavity. The sound-emitting unit divides the receiving cavity into an acoustically isolated front cavity and a rear cavity. The housing is provided with a front sound outlet connecting the front cavity to the outside and a rear sound outlet connecting the rear cavity to the outside; wherein,

[0006] The sound-generating unit includes a support frame and a magnetic circuit system and a vibration system connected to the support frame. The magnetic circuit system has a first magnetic gap and a second magnetic gap, with the first magnetic gap surrounding the second magnetic gap. The vibration system includes a first diaphragm and a second diaphragm disposed 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 is located within the first magnetic gap, and the second voice coil is located within the second magnetic gap.

[0007] The sound-generating 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 airflow channel is provided between the magnetic circuit system and the first diaphragm for the airflow of the second diaphragm to flow out. The sound waves of the second diaphragm facing the first side radiate outward through the airflow channel and together with the sound waves of the first diaphragm facing the first side radiate towards 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 radiate together towards the second side.

[0008] The rear sound outlet includes a rear front sound outlet disposed opposite to the second diaphragm, and the ratio of the area of ​​the rear front 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 reinforcing portion and a third folded ring arranged around the second reinforcing portion, the second reinforcing portion is connected to the inner connecting portion of the third folded ring, the second voice coil is connected to the second reinforcing portion, and in the vibration direction of the vibration system, the distance between the surface of the inner connecting portion away from the second reinforcing portion and the inner wall of the housing with 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 also provided on the side of the housing, and the rear sound outlet hole and the rear front sound outlet hole are located on different surfaces of the housing;

[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 folded ring, a second folded ring located outside the first folded ring, and a first reinforcing portion disposed between the first folded ring and the second folded ring. The first reinforcing portion is connected to the first voice coil, the first folded ring surrounds the airflow channel, and the inner edge of the first folded ring is connected to the magnetic circuit system.

[0014] And / or, the second diaphragm includes a second reinforcing portion and a third folded ring disposed around the second reinforcing portion, the second reinforcing portion being disposed at the center of the third folded ring portion, the outer edge of the third folded ring portion being connected to the bracket, and the second voice coil being connected to the second reinforcing portion.

[0015] Preferably, the magnetic circuit system includes a magnetic yoke, a central magnetic circuit, and side magnetic circuits disposed 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 connector 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 disposed on the central yoke plate and forms a second magnetic gap with the side yoke plate. The side magnetic circuit is disposed on the side yoke plate and forms a first magnetic gap with the central yoke plate. The airflow channel passes through the central yoke plate, the central magnetic circuit, and the first diaphragm.

[0017] Preferably, the central yoke plate has an extension that bends and extends toward the first diaphragm, the extension being connected to the inner edge of the first diaphragm, and the airflow channel includes a first through hole penetrating the central magnetic circuit, a second through hole penetrating the central yoke plate, and a third through hole penetrating the first diaphragm.

[0018] Preferably, the central region of the central yoke plate protrudes towards the central magnetic circuit to form a protrusion, the protrusion being connected to the central magnetic circuit. The central yoke plate has a first front cover on the side near the first diaphragm, the first front cover being connected to the inner edge of the first diaphragm. The airflow channel includes a first through hole penetrating the central magnetic circuit, a second through hole penetrating the central yoke plate, a third through hole penetrating the first diaphragm, and a fourth through hole penetrating the first front cover.

[0019] Preferably, there is a first space between the first front cover and the central yoke plate, and the airflow channel further includes a fifth through hole penetrating the central yoke plate. The fifth through hole is located on the outside of the protrusion, and the two sides of the fifth through hole are respectively connected to the second magnetic gap and the first space.

[0020] And / or, the first front cover includes a top plate, a connecting plate disposed around the 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 is connected to the side of the central yoke plate opposite to the central magnetic circuit. The top plate is provided with the fourth through hole, and the inner periphery of the first diaphragm is connected to the top plate.

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

[0022] Preferably, 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 communicating with the first cavity. Sound waves from the first diaphragm facing the second side radiate to the rear cavity through the first leakage hole.

[0023] And / or, a second front cover is provided on the side of the first diaphragm 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, the second diaphragm has a rear cover on the side opposite to the first diaphragm, and the rear cover has a second sound outlet hole communicating with the rear cavity.

[0025] Preferably, the central magnetic circuit includes a central magnet and a central magnetic guide plate, the central magnet being connected to the central yoke plate; the side magnetic circuit includes a side magnet and a side magnetic guide plate, the side magnet being connected to the side yoke plate; a second magnetic gap is formed between the central magnetic guide plate and the side yoke plate; and a first magnetic gap is formed between the side magnetic guide plate and the central yoke plate.

[0026] Alternatively, the central yoke plate, the side yoke plate, and the connector are integrally formed;

[0027] Alternatively, the connector may be 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 a first sound wave toward the first side, the first diaphragm and the second diaphragm radiate a second sound wave toward the second side, and the first sound wave and the second sound wave are out of phase.

[0029] As can be seen from the above technical solution, 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-generating unit with a double-sided diaphragm, wherein the first side of the double-sided diaphragm of the sound-generating unit emits sound towards the front cavity and the second side emits sound towards the rear cavity. At the same time, a rear-facing 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 acoustic duct length is shortened, the sound quality of the rear cavity is reduced, and the mid-frequency loudness is improved.

[0030] To achieve the foregoing and related objectives, one or more aspects of the invention include the features that will be described in detail below. The following description and accompanying drawings illustrate certain exemplary aspects of the invention. However, these aspects indicate only a few of the various ways in which the principles of the invention can be used. Furthermore, the invention is intended to encompass all such aspects and their equivalents. Attached Figure Description

[0031] Other objects and results of the invention will become more apparent and readily understood with reference to the following description taken in conjunction with the accompanying drawings. In the drawings:

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

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

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

[0035] Figure 4 This is a schematic diagram of an electronic device according to an embodiment of the present invention, having a rear front sound outlet and a rear side sound outlet;

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

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

[0038] Figure 7 This is a schematic diagram of the explosive structure of the sound-generating unit according to Embodiment 1 of the present invention;

[0039] Figure 8 This is a cross-sectional view of the sound-generating unit according to Embodiment 1 of the present invention;

[0040] Figure 9 This is a schematic diagram of the explosive structure of the sound-generating unit according to Embodiment 2 of the present invention;

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

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

[0043] The reference numerals in the accompanying drawings include: 1, first diaphragm; 11, first folded ring; 12, second folded ring; 13, first reinforcing part; 14, central dustproof net.

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

[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. Central magnet; 53. Central magnetic plate; 54. Side magnet; 55. Magnetic yoke; 551. Central yoke plate; 552. Side yoke plate; 553. Magnetic yoke plate; 554. Extension; 555. Protrusion; 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. Airflow 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 support; 62. Second support; 63. First leakage hole; 64. Side dustproof net.

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

[0050] 8. Back cover; 81. Second sound outlet.

[0051] 9. Housing; 91. Front sound outlet; 92. Rear front sound outlet; 93. Rear side sound outlet; 96. Front cavity; 97. Rear cavity.

[0052] In all the accompanying drawings, the same reference numerals indicate similar or corresponding features or functions. Detailed Implementation

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

[0054] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

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

[0056] The specific embodiments of the present invention will now be described in detail 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-generating unit are illustrated by way of example from different perspectives. Specifically, Figure 1A cross-sectional view of an electronic device according to Embodiment 1 of the present invention is shown; Figure 2 A cross-sectional view of an electronic device according to Embodiment 2 of the present invention is shown; Figure 3 The front sound outlet structure of an electronic device according to an embodiment of the present invention is shown; Figure 4 This illustrates an electronic device according to an embodiment of the present invention, having a rear front sound outlet and a rear side sound outlet structure; Figure 5 This illustrates an electronic device according to an embodiment of the present invention, having a structure with two rear front sound outlets and a rear side sound outlet; Figure 6 A schematic diagram of an electronic device with a rear positive sound outlet hole according to an embodiment of the present invention is shown. Figure 7 The sound-emitting unit explosion structure according to Embodiment 1 of the present invention is shown; Figure 8 The cross-sectional structure of the sound-generating unit according to Embodiment 1 of the present invention is shown; Figure 9 The sound-emitting unit explosion structure according to Embodiment 2 of the present invention is shown; Figure 10 The cross-sectional structure of the sound-generating unit according to Embodiment 2 of the present invention is shown; Figure 11 The sensitivity of different aperture ratios according to embodiments of the present invention is shown.

[0058] like Figures 1 to 11 As shown in the figure, the present invention provides an electronic device, including a housing 9 having a receiving cavity and a sound-generating unit disposed within the receiving cavity. The sound-generating unit divides the receiving cavity into an acoustically isolated front cavity 96 and a rear cavity 97. The housing 9 is provided with a front sound outlet 91 connecting the front cavity 96 to the outside and a rear sound outlet connecting the rear cavity 97 to the outside. The sound-generating 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, with the first magnetic gap 41 surrounding the second magnetic gap 42. The vibration system includes a first diaphragm 1 and a second diaphragm 2 disposed 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. The first voice coil 3 is located on the first magnetic circuit system 5. Within gap 41, the second voice coil 4 is located within the second magnetic gap 42; the sound-generating 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 airflow channel 30 is provided between the magnetic circuit system 5 and the first diaphragm 1 for the airflow of the second diaphragm 2 to flow out, the sound wave of the second diaphragm 2 facing the first side radiates outward through the airflow channel 30 and together with the sound wave of the first diaphragm 1 facing the first side radiates to the first side; the sound wave of the first diaphragm 1 facing the second side and the sound wave of the second diaphragm 2 facing the second side radiate together to the second side; and the rear sound outlet includes a rear positive sound outlet 92 disposed opposite to the second diaphragm, 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%.

[0059] In an embodiment of the present invention, the vibration system of the sound-generating 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 radiate outward from the same side of the sound-generating unit, which is beneficial 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 sound-generating unit. When the electronic device uses this sound-generating unit, the acoustic performance of the electronic device is improved. By installing the sound-generating unit in the housing 9 of the electronic device, the housing 9 is divided into a front cavity 96 and a rear cavity that are isolated from each other. 97. The sound waves from the first side of the first diaphragm 1 and the second diaphragm 2 radiate towards the front cavity 96, and the sound waves from the second side radiate towards the rear cavity 97. The housing 9 is provided with a front sound outlet 91 communicating with the front cavity 96 and a rear sound outlet communicating with the rear cavity 97. The rear sound outlet includes a rear front sound outlet 92 facing the second diaphragm 2. Compared with conventional electronic devices that only have side sound outlets communicating with the rear cavity, the design of the rear front sound outlet 92 in this application shortens the acoustic channel 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 front 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%, and 100%, further enhancing the smoothness of airflow in the rear cavity and further improving the mid-frequency response of the electronic device.

[0060] The shape of the housing 9 can be circular or cylindrical. The appropriate shape can be selected according to the actual needs of the application. There is no specific limitation here, as long as it is compatible with the sound-generating unit.

[0061] In an 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 11Loudness (sensitivity) curves with different aperture ratios were set for electronic devices in simulation experiments. The curves show a significant increase in loudness between 5% and 10% and between 10% and 23% aperture ratios, while the curves between 23% and 50% and between 50% and 100% show little change and remain almost identical. Analysis reveals that in the mid-frequency (200Hz-3kHz) range, a 5% aperture ratio for the rear front-facing speaker results in low mid-frequency loudness and poor acoustic performance. A 10% aperture ratio for the rear front-facing speaker improves the overall mid-frequency loudness by more than 3dB compared to 5%, meeting the requirements for electronic device use, while also satisfying aesthetic requirements. A 23% aperture ratio for the rear front-facing speaker achieves even better mid-frequency loudness, further improving the overall acoustic performance. Furthermore, when the aperture ratio of the rear front-facing speaker (92) is further increased to 50% to 100%, the change in mid-frequency loudness is minimal. Therefore, the optimal ratio of the area of ​​the rear positive sound outlet 92 to the effective radiation area of ​​the second diaphragm 2 is 10%-23%. When the aperture ratio is 10%, the performance of the electronic device is improved, meeting the usage requirements, and the smaller aperture ratio also meets the aesthetic requirements of the overall device. When the aperture ratio is 23%, the performance of the electronic device is basically at its 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 its optimal state, and the aperture ratio can be set according to the needs of the designer and the user.

[0062] Based on the simulation data above, it can be further defined that the ratio of the area of ​​the rear positive sound hole 92 to the effective radiation area of ​​the second diaphragm 2 is in the range of 10%-23%. The preferred opening ratio is any value between 10% and 23% based on the actual situation of the headphones. On the basis of meeting its acoustic performance, an appropriate opening ratio can be set according to the actual situation, and it is not limited to the above-mentioned limiting requirements.

[0063] In an embodiment of the present invention, since the rear front 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 front sound outlet 92, thereby reducing the sound quality of the rear cavity 97, reducing the length of the acoustic channel, i.e., the distance between the rear front sound outlet 92 and the second diaphragm 2, and further reducing the thickness of the electronic device. In order to ensure acoustic performance and meet the requirements of miniaturization of the whole device, the distance d between the rear front sound outlet 92 and the second diaphragm 2 needs to be 0.4mm larger than the amplitude of the second diaphragm 2. Furthermore, the second diaphragm 2 includes a second reinforcing part 22 and a third folding ring 21 arranged around the second reinforcing part 22. The second reinforcing part 22 is connected to the inner connecting part of the third folding ring 21, and the second voice coil 4 is connected to the second reinforcing part 22. In the vibration direction of the vibration system, the distance between the surface of the inner connecting part of the second diaphragm 2 facing away from the second reinforcing part 22 and the inner wall of the housing 9 with the rear front 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, the smaller the thickness of the electronic device.

[0064] in, Figure 1 , Figure 2 Electronic devices with different sound-generating unit structures are shown. Depending on the requirements, double-sided sound-generating units with different structures are installed in the housing 9 of the electronic device. Figure 3 The position and structure of the front sound outlet 91 are shown. The front sound outlet 91 corresponds to the first diaphragm 1 (double-folded ring diaphragm). The front sound outlet 91 adopts a fan-shaped ring design.

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

[0066] like Figure 4 As shown, a rear front sound outlet 92 and a rear side sound outlet 93, which communicate with the rear cavity 97, are respectively provided on two different surfaces of the housing 9. Specifically, a rear front sound outlet 92 is provided at a position corresponding to the center of the housing 9 and the second diaphragm 2, and the rear front sound outlet 92 is circular; a rear side sound outlet 93, which communicates with the rear cavity 97, is also provided on the side of the housing 9. The rear side sound outlet 93 and the rear front sound outlet 92 are located on different surfaces of the housing 9, and the rear side sound outlet 93 is a strip structure.

[0067] In embodiments of the present invention, the number of rear positive sound outlet holes 92 is at least two, and the rear positive sound outlet holes 92 are evenly spaced. For example... Figure 5As shown, two rear front sound outlets 92 and one rear side sound outlet 93 are respectively provided on the housing 9. Specifically, two semi-circular rear front sound outlets 92 are provided at positions corresponding to the edge regions of the housing 9 and the second diaphragm 2, and the two rear front 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, different numbers of rear front sound outlets 92 can be provided as needed.

[0068] In other embodiments, such as Figure 6 As shown, only one rear sound outlet is provided on the housing 9, that is, a circular rear sound outlet 92 is provided only at the position directly corresponding to the second diaphragm 2 on the housing 9. In other words, there is no rear sound outlet communicating with the rear cavity 97 on the side of the housing 9.

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

[0070] In embodiments 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 a first sound wave to the first side through the front sound outlet 91, and the first diaphragm 1 and the second diaphragm 2 radiate a second sound wave to the second side through the rear front sound outlet 92 and / or the rear side sound outlet 93. The first sound wave and the second sound wave are out of phase. 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 to produce sound, thereby improving the sound production effect and performance of the sound-producing unit. Since the first sound wave in the front cavity 96 and the second sound wave in the rear cavity 97 are out of phase, the sound wave in the front cavity 96 radiates to the outside through the front sound outlet 91, and the sound wave in the rear cavity 97 radiates to the outside through the rear sound outlet, the technical effect of an acoustic dipole can be achieved, resulting in far-field noise reduction and protecting the user's privacy during use.

[0071] In embodiments of the present invention, the specific structure of the sound-generating unit can be set according to actual conditions. Figures 7 to 10In the illustrated embodiment, the sound-generating unit includes a bracket (first bracket 61 and second bracket 62); a magnetic circuit system 5; and a vibration system. The bracket is used to install, fix, and support components such as the magnetic circuit system 5 and the vibration system, that is, the bracket provides a mounting base for components such as the magnetic circuit system 5 and the vibration system. Optionally, the outer shell 1 can be a single integral structure or formed by multiple separate structures, which is not limited here. In this embodiment, the support can be a frame or a frame structure, that is, the support has a cavity with openings at both ends. The magnetic circuit system 5 is housed in the cavity of the support and connected to the support. The first diaphragm 1 and the second diaphragm 2 of the vibration system are respectively located 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 support, thus forming a double diaphragm structure. In this way, the two voice coils (first voice coil 3 and second voice coil 4) of the vibration system are driven by one magnetic circuit system 5 to drive the two diaphragms (first diaphragm 1 and second diaphragm 2) to vibrate and produce sound. At the same time, the double-sided diaphragm can produce sound in the same direction without increasing the external size, and the vibration area of ​​the vibration system is increased, thereby achieving the purpose of performance improvement.

[0072] Optionally, the support is cylindrical, with the outer contours of the first diaphragm 1 and the second diaphragm 2 roughly aligned, facilitating the standardized design of the sound-generating unit's shape and further simplifying its assembly within the housing 9 of the electronic device, thus reducing the overall pre-reserved structure. Further, the support may include a cylindrical first support 61 and a cylindrical second support 62, which are fitted together to form the cylindrical support. The design of the support, divided into a first support 61 and a second support 62, allows for the assembly of the first diaphragm 1 via the first support 61 and the second diaphragm 62 via the second support 62, facilitating the assembly of the sound-generating unit during the assembly process. Conductive terminals can also be provided on the first and second supports respectively, thereby facilitating the 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, radiating a first sound wave to the first side and a second sound wave to the second side, with the first and second sound waves having 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 to produce sound, thereby improving the sound production effect and performance of the sound-producing unit. By having the first sound wave in the front cavity 96 and the second sound wave in the rear cavity 97 have opposite phases, the sound wave in the front cavity 96 radiates to the outside through the front sound outlet 91, and the sound wave in the rear cavity 97 radiates to the outside through the rear sound outlet, achieving the technical effect of an acoustic dipole, achieving far-field noise reduction, and protecting the user's privacy during use. In an embodiment of the present invention, an airflow channel 30 is provided between the magnetic circuit system 5 and the first diaphragm 2 for the airflow of the second diaphragm 2 to flow out, thereby facilitating the outward radiation of the sound waves of the second diaphragm 2 facing the first side through the airflow channel 30 and together with the sound waves of the first diaphragm surface 1 facing the first side to radiate to the first side; thus, 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 folded ring 11, an outer second folded ring 12, and a first reinforcing portion 13 disposed between the first folded ring 11 and the second folded ring 12. The first reinforcing portion 13 is connected to the first voice coil 3. The first folded ring 11 surrounds the airflow channel 30, and the inner edge of the first folded ring 11 is connected to the magnetic circuit system 5. That is, in the embodiment of the present invention, by setting the first diaphragm 1 as a double-folded ring structure, the first voice coil 3 can drive the first diaphragm 1 to vibrate while simultaneously improving the compliance of the first diaphragm 1 and enhancing its high-frequency performance.

[0075] In this invention, the magnetic circuit system 5 includes a magnetic yoke 55, a central magnetic circuit and a side magnetic circuit disposed on the magnetic yoke 55. The magnetic 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. The central yoke plate 551 and the side yoke plate 552 are not coplanar. A magnetically conductive yoke plate 553 connects the central yoke plate 551 and the side yoke plate 552. The central magnetic circuit is disposed on the central yoke plate 551 and connected to the side yoke plate 552. A second magnetic gap 42 is formed between 52, and a side magnetic circuit is set on the side yoke plate 552 and forms a first magnetic gap 41 between it and the central yoke plate 551. The airflow channel 30 passes through the central yoke plate 551, the central magnetic circuit and the first diaphragm 1. The formed airflow channel 30 effectively increases the airflow area when the second diaphragm 2 vibrates, thereby ensuring smoother airflow and improving the mid-frequency loudness performance of the second diaphragm 2, thereby improving the mid-frequency loudness performance of the superimposed first diaphragm 1 and second diaphragm 2.

[0076] Specifically, the central magnetic circuit includes a central magnet 52 and a central magnetic guide plate 53, and the side magnetic circuit includes a side magnet 54 and a side magnetic guide 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 guide plate 53 and the side yoke plate 552, and a first magnetic gap 41 is formed between the side magnetic guide plate 51 and the central yoke plate 551. In the embodiment shown in this invention, the central yoke plate 551, the side yoke plate 552, and the connector are integrally formed; or, the connector is designed as a permanent magnet. In application, a suitable structural form can be rotated according to actual needs.

[0077] In Embodiment 1, the central yoke plate 551 has an extension 554 that bends and extends towards the first diaphragm 1. The extension 554 is connected to the inner edge of the first diaphragm 1, specifically, the extension 554 is connected to the inner edge of the first folded ring 11. The central yoke plate 551 is integrally formed with the extension 554 connected to the inner edge of the first diaphragm 1, which helps to simplify the number of components and improve the positioning accuracy during assembly. The airflow channel 30 includes a first through hole 31 that penetrates the central magnetic circuit, a second through hole 32 that penetrates the central yoke plate 551, and a third through hole 33 that penetrates the first diaphragm 1. That is, the sound waves of the second diaphragm 2 facing the first side radiate outward through the first through hole 31, the second through hole 32, and the third through hole 33, and together with the sound waves of the first diaphragm 1 facing the first side, radiate towards the first side, thereby improving the mid-frequency loudness of the superimposed first diaphragm 1 and the second diaphragm 2.

[0078] In Embodiment 2, a protrusion 555 is formed in the central region of the central yoke plate 551 protruding towards the central magnetic circuit. The protrusion 555 is connected to the central magnetic circuit, and a second through hole 32 is formed in the center of the protrusion 555, which communicates with the first through hole 31 of the central magnetic circuit. By controlling the central yoke plate 551 to have a protrusion 555 connected to the central magnetic circuit, the structural strength of the central yoke plate 551 and the connection area between the central magnetic circuit and the central yoke plate 551 can be ensured, thereby improving the stability of the magnetic circuit structure. Optionally, the connection area between the central magnetic circuit and the central yoke plate 551 is S1, and the surface area of ​​the central magnetic circuit facing the central 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 central yoke plate 551. Specifically, it can be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, etc., and is not limited here.

[0080] Understandably, if the area of ​​the second through hole 32 is too small, it will not be conducive to the radiation of sound waves from the second diaphragm 2 to the outside; if the area of ​​the second through hole 32 is too large, the bonding area between the central magnetic circuit and the protrusion 555 will be too small, which will not be 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 central yoke 551 near 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 penetrating the central magnetic circuit, a second through hole 32 penetrating the central yoke 551, a third through hole 33 penetrating the first diaphragm 1, and a fourth through hole 34 penetrating the first front cover 56. The first front cover 56 is used to connect and fix the first diaphragm 1 and the central yoke 551, freeing up the shape design of the central yoke 551, allowing the central yoke 551 to be bent in the opposite direction to connect with the central magnetic circuit, improving installation stability and reducing reliability risks. At this time, the sound waves of the second diaphragm 2 radiate to 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 provided between the first front cover 56 and the central yoke plate 551. The airflow channel 30 also includes a fifth through hole 35 penetrating the central yoke plate 551. The fifth through hole 35 is located on the outside of the protrusion 551. The two sides of the fifth through hole 35 are respectively connected to the second magnetic gap 42 and the first space 36. The sound waves of the second diaphragm 2 are further radiated to the first side through the fifth through hole 35, the first space 36, the fourth through hole 34, and the third through hole 33. In this way, the fifth through hole 35 is used to connect the second magnetic gap 42 and the first space 36, ensuring the smooth airflow in the magnetic gap under the second diaphragm 2 and improving the high-frequency performance of the second diaphragm 2.

[0083] The first front cover 56 includes a top plate 561, a connecting plate 562 disposed around the periphery of the top plate 561, and a bottom plate 563 formed by extending outward from the end of the connecting plate 562 away from the top plate 561. The bottom plate 563 is connected to the side of the central yoke plate 551 facing away from the central 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 In Example 2, the extension 554 and the central yoke 551 are integrally molded. Figure 9 and Figure 10 In this design, the central yoke plate 551 and the first front cover 56 can be integrally formed or separate structures. 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 connected to the first diaphragm 1. The bottom plate 563 is connected and fixed to the central yoke plate 551. In specific applications, a suitable design structure can be selected according to the actual situation, and it is not limited to one of the above methods.

[0085] In addition, in embodiment two, a central dustproof net 14 is provided in the third through hole 33 of the first diaphragm 1, and a side dustproof net 64 is provided at the edge of the first bracket 61. The dustproof net prevents external dust or impurities from entering the interior of the sound-generating 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 reinforcing portion 22 and a third folded ring 21 surrounding the second reinforcing portion 22. The second reinforcing portion 22 is located at the center of the third folded ring 21, and the outer edge of the third folded ring 21 is connected to a support. The second voice coil 4 is connected to the second reinforcing portion 22. The second reinforcing portion 22 and the third folded ring 21 of the second diaphragm 2 can be integrally formed or separately disposed, and are not limited here. It is understood that the third folded ring 21 of the second diaphragm 2 can be an upwardly convex bulge structure or a downwardly concave bulge structure, and are not limited here. Optionally, the third folded ring 21 protrudes in a direction away from the magnetic circuit system 5.

[0087] The outer edge of the third folding ring 21 is connected to the bracket, and the second voice coil 4 is connected to the second reinforcing part 22. When the second voice coil 4 vibrates, it drives the second diaphragm 2 to vibrate, thereby causing the sound waves of the second diaphragm 2 to radiate outward to the first side 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.

[0088] In Embodiment 1, a first cavity is formed between the first diaphragm 1, the support, and the magnetic circuit system 5. The first cavity is a sealed cavity. The sound-generating unit is provided with a first leakage hole 63 that connects the first cavity to the outside. The sound waves of the first diaphragm 1 facing the second side are radiated to the rear cavity 97 through the first leakage hole 63. That is, the first cavity is a sealed cavity, and the first cavity is connected to the rear cavity 97 only through the first leakage hole 63.

[0089] Furthermore, there are multiple first leakage holes 63, which are symmetrically arranged circumferentially around the sound-generating unit. Optionally, the central magnetic circuit includes a central magnet 52 and a central magnetic guide plate 53, and the side magnetic circuit includes a side magnet 54 and a side magnetic guide plate 51. A second magnetic gap is formed between the central magnetic guide plate 53 and the side yoke plate 552, and a first magnetic gap is formed between the side magnetic guide plate 51 and the central yoke plate 551. The side magnetic guide plate 51 is injection molded onto the bracket, and the first leakage holes 63 are formed by removing material from the side magnetic guide plate 51 and the corresponding bracket area. In embodiments of the present invention, by removing material from the side magnetic guide plate 51 and the bracket, the first leakage holes 63 do not additionally occupy the radial dimension of the sound-generating unit in order to maximize the radial dimension of the sound-generating unit, or the size of the leakage holes can be increased within the limited size of the sound-generating unit to balance the internal pressure.

[0090] In Embodiment 2, a second front cover 57 is provided on the side of the first diaphragm 1 away from the second diaphragm 2. The second front cover 57 is used to protect the first diaphragm 1. The second front cover 57 is provided with a first sound outlet 571 that communicates with the front cavity. The first diaphragm 1 radiates sound waves outward through the first sound outlet 571, and the second diaphragm 1 radiates sound waves to the first side through the airflow channel 30 and the first sound outlet 571.

[0091] In Embodiment 1, the sound-generating unit also includes a rear cover 8, located on the side of the second diaphragm 2 away from the first diaphragm 1. The rear cover 8 has a second sound outlet 81 communicating with 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 facilitates strong support for the sound-generating unit during assembly while also reducing its footprint on the overall unit. In specific applications, an appropriate number of leakage holes is set according to the actual situation, and is not limited to a fixed number.

[0092] Furthermore, in embodiments of the present invention, positioning rings for positioning can be provided between the second folding ring 12, the third folding ring 22 and the bracket, and between the first folding ring 11 and the support member 10. Specifically, the positioning rings can be steel rings. Specifically, a first positioning ring 71 for positioning is provided between the second folding ring 12 and the bracket, and a second positioning ring 72 for positioning is provided between the third folding ring 22 and the bracket. By using positioning rings, the first diaphragm 1 or the second diaphragm 2 is easier to handle during assembly, and the assembly accuracy is improved, thereby enhancing the performance of the sound-generating unit.

[0093] As can be seen from the above embodiments, 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-generating unit with a double-sided diaphragm, wherein the first side of the double-sided diaphragm of the sound-generating unit radiates sound waves toward the front cavity 96 and the second side radiates 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 housing 9 of the electronic device, which shortens the acoustic pipe length, reduces the sound quality of the rear cavity, and improves the mid-frequency loudness compared with the traditional rear cavity side sound outlet.

[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 understand that various modifications can be made to the electronic device according to the present invention without departing from the scope of the invention. Therefore, the scope of protection of the present invention should 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 unit divides the receiving cavity into an acoustically isolated front cavity and a rear cavity. The housing is provided with a front sound outlet connecting the front cavity to the outside, and a rear sound outlet connecting the rear cavity to the outside; wherein... The sound-generating unit includes a support frame and a magnetic circuit system and a vibration system connected to the support frame. The magnetic circuit system has a first magnetic gap and a second magnetic gap, with the first magnetic gap surrounding the second magnetic gap. The vibration system includes a first diaphragm and a second diaphragm disposed 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 is located within the first magnetic gap, and the second voice coil is located within the second magnetic gap. The sound-generating 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 airflow channel is provided between the magnetic circuit system and the first diaphragm for the airflow of the second diaphragm to flow out. The sound waves of the second diaphragm facing the first side radiate outward through the airflow channel and together with the sound waves of the first diaphragm facing the first side radiate towards 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 radiate together towards the second side. The rear sound outlet includes a rear front sound outlet disposed opposite to the second diaphragm, and the ratio of the area of ​​the rear front sound outlet to the effective radiation area of ​​the second diaphragm is 5%-100%. The magnetic circuit system includes a magnetic yoke, a central magnetic circuit, and side magnetic circuits disposed 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 connector 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 disposed on the central yoke plate and forms a second magnetic gap with the side yoke plate. The side magnetic circuit is disposed on the side yoke plate and forms a first magnetic gap with the central yoke plate. The airflow channel passes through the central yoke plate, the central magnetic circuit, and the first diaphragm. The central region of the central yoke plate protrudes towards the central magnetic circuit to form a protrusion, which is connected to the central magnetic circuit. The central yoke plate is provided with a first front cover on the side near the first diaphragm, which is connected to the inner edge of the first diaphragm. The airflow channel includes a first through hole that penetrates the central magnetic circuit, a second through hole that penetrates the central yoke plate, a third through hole that penetrates the first diaphragm, and a fourth through hole that penetrates the first front cover.

2. The electronic device according to claim 1, characterized in that, 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 reinforcing portion and a third folded ring arranged around the second reinforcing portion, the second reinforcing portion is connected to the inner connecting portion of the third folded ring, the second voice coil is connected to the second reinforcing portion, and in the vibration direction of the vibration system, the distance between the surface of the inner connecting portion away from the second reinforcing portion and the inner wall of the housing with the rear positive sound outlet is 0.7-1.1 mm. And / or, a rear sound outlet hole communicating with the rear cavity is also provided on the side of the housing, and the rear sound outlet hole and the rear front sound outlet hole are located on different surfaces of the housing; 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, characterized in that, The first diaphragm includes a first folded ring, a second folded ring located outside the first folded ring, and a first reinforcing portion disposed between the first folded ring and the second folded ring. The first reinforcing portion is connected to the first voice coil. The first folded ring surrounds the airflow channel, and the inner edge of the first folded ring is connected to the magnetic circuit system. And / or, the second diaphragm includes a second reinforcing portion and a third folded ring disposed around the second reinforcing portion, the second reinforcing portion being disposed at the center of the third folded ring, the outer edge of the third folded ring being connected to the bracket, and the second voice coil being connected to the second reinforcing portion.

4. The electronic device according to claim 1, characterized in that, There is a first space between the first front cover and the central yoke plate. The airflow channel also includes a fifth through hole penetrating the central yoke plate. The fifth through hole is located on the outside of the protrusion. The two sides of the fifth through hole are respectively connected to the second magnetic gap and the first space. And / or, the first front cover includes a top plate, a connecting plate disposed around the 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 is connected to the side of the central yoke plate opposite to the central magnetic circuit. The top plate is provided with the fourth through hole, and the inner periphery of the first diaphragm is connected to the top plate. And / or, the connection area between the central magnetic circuit and the central yoke is S1, and the area of ​​the surface of the central magnetic circuit facing the central yoke is S, where S1:S≥50%.

5. The electronic device according to claim 1, characterized in that, 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 that communicates with the first cavity. Sound waves from the first diaphragm facing the second side radiate to the rear cavity through the first leakage hole. And / or, a second front cover is provided on the side of the first diaphragm 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, the second diaphragm has a rear cover on the side opposite to the first diaphragm, and the rear cover has a second sound outlet hole communicating with the rear cavity.

6. The electronic device according to claim 1, characterized in that, The central magnetic circuit includes a central magnet and a central magnetic guide plate, the central magnet being connected to the central yoke plate; the side magnetic circuit includes a side magnet and a side magnetic guide plate, the side magnet being connected to the side yoke plate; a second magnetic gap is formed between the central magnetic guide plate and the side yoke plate; and a first magnetic gap is formed between the side magnetic guide plate and the central yoke plate. Alternatively, the central yoke plate, the side yoke plate, and the connector are integrally formed; Alternatively, the connector may be a permanent magnet.

7. The electronic device according to any one of claims 1-6, characterized in that, The first diaphragm and the second diaphragm vibrate in the same direction, the first diaphragm and the second diaphragm radiate a first sound wave toward the first side, and the first diaphragm and the second diaphragm radiate a second sound wave toward the second side, the first sound wave and the second sound wave are out of phase.

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