Electronic device

Abstract

An electronic device provided by the present invention comprises a shell with an accommodating cavity and a sound production monomer arranged in the accommodating cavity, the sound production monomer has a first side and a second side which are opposite to each other along the vibration direction of a vibration system, and a front cavity is formed between the first side of a first vibrating diaphragm and the shell. A rear cavity is formed between the second side of the second vibrating diaphragm and the shell, and the front cavity and the rear cavity are isolated from each other; a Helmholtz resonance cavity structure is arranged in the front cavity, the Helmholtz resonance cavity structure comprises a Helmholtz resonance cavity body and a Helmholtz resonance cavity airflow channel communicated with the Helmholtz resonance cavity body, and sound waves of the front cavity enter the Helmholtz resonance cavity body through the Helmholtz resonance cavity airflow channel. By using the electronic equipment, the problems that the front cavity in the existing electronic equipment resonates, the sensitivity generates a formant, and the sound is easy to be sharp and harsh 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] With the recent development of electronic products, electronic devices such as headphones, smartphones, and VR have gained consumer acceptance. As the performance of these products improves, the need for improved acoustic performance in sound-generating devices is inevitable. As audio equipment continues to evolve, optimizing the performance of speakers, key components in sound reproduction, remains a core focus of research and innovation. From the simple sound-generating devices of the early days to today's high-fidelity speaker systems that pursue the ultimate sound quality experience, user expectations for speaker sound reproduction and richness continue to rise. However, traditional speakers, particularly OWS (Open Wearable Stereo) headphones, have numerous limitations in sound transmission and quality. In the high-frequency range, the resonance of the front cavity of OWS headphones creates a sensitivity peak, resulting in sharp and piercing sounds. This can cause the treble of some string instruments to lose their original softness and delicacy when reproduced. Summary of the Invention

[0003] In view of the above problems, the purpose of the present invention is to provide an electronic device to solve the problem that the front cavity of the electronic device resonates, the sensitivity generates a resonance peak, and the sound is sharp and harsh.

[0004] The present invention provides an electronic device, comprising a housing having a receiving cavity and a sound-emitting unit arranged in the receiving cavity, wherein:

[0005] The sound unit includes a bracket and a magnetic circuit system and a vibration system connected to the bracket. The magnetic circuit system has a first magnetic gap and a second magnetic gap, and the first magnetic gap is 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 is located in the first magnetic gap, and the second voice coil is located in the second magnetic gap.

[0006] 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; a front cavity is formed between the first side of the first diaphragm and the shell, and a rear cavity is formed between the second side of the second diaphragm and the shell, and the front cavity and the rear cavity are isolated; an air flow channel for the outflow of air from the second diaphragm is provided between the magnetic circuit system and the first diaphragm; the sound waves of the second diaphragm facing the first side are radiated outward through the air flow channel and radiated toward the front cavity 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 rear cavity together;

[0007] A Helmholtz resonance cavity structure is provided in the front cavity. The Helmholtz resonance cavity structure includes a Helmholtz resonance cavity body and a Helmholtz resonance cavity airflow channel connected to the Helmholtz resonance cavity body. The sound waves of the front cavity enter the Helmholtz resonance cavity through the Helmholtz resonance cavity airflow channel.

[0008] Preferably, the ratio of the volume of the front cavity to the volume of the Helmholtz resonance cavity is 1:4-2:1; and / or,

[0009] The cross-sectional area of ​​the air flow channel of the Helmholtz resonance cavity is 0.05mm 2 ~10mm 2 and / or,

[0010] The length of the air flow channel of the Helmholtz resonance cavity is 0.5 mm to 5 mm.

[0011] Preferably, the Helmholtz resonance cavity structure and the housing are an integral injection-molded structure, and the Helmholtz resonance cavity airflow channel is provided on the injection-molded body forming the Helmholtz resonance cavity;

[0012] And / or, there are multiple Helmholtz resonance cavities, and the Helmholtz resonance cavities form a series cavity, and the multiple series cavities are connected to the front cavity through one Helmholtz resonance cavity air flow channel; or, the multiple Helmholtz resonance cavities form a parallel cavity, and each Helmholtz resonance cavity is connected to the front cavity through a different Helmholtz resonance cavity air flow channel.

[0013] Preferably, a front sound outlet hole communicating with the outside is provided on the front cavity shell;

[0014] A rear positive sound outlet hole is provided on the rear cavity shell body which is connected to the outside and corresponds to the second diaphragm, and a rear side sound outlet hole which is connected to the outside is provided on the side surface of the rear cavity shell body.

[0015] 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;

[0016] 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.

[0017] Preferably, the magnetic circuit system includes a magnetic yoke, a central magnetic circuit and a side magnetic circuit arranged on the magnetic yoke; wherein,

[0018] 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.

[0019] Preferably, the central 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 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;

[0020] And / or, the central area of ​​the central yoke plate protrudes toward the central magnetic circuit to form a protrusion, 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, the first front cover is connected to the inner edge of the first diaphragm, and 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.

[0021] 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.

[0022] 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;

[0023] 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%.

[0024] 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;

[0025] 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;

[0026] 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.

[0027] Preferably, the first diaphragm and the second diaphragm vibrate in the same direction, radiate first sound waves to the front cavity, and radiate second sound waves to the rear cavity, and the first sound wave and the second sound wave have opposite phases.

[0028] 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 Helmholtz resonance chamber structure is provided in the front cavity, and the Helmholtz resonance chamber structure includes a Helmholtz resonance chamber airflow channel and a Helmholtz resonance cavity body. The sound wave enters the Helmholtz resonance cavity through the Helmholtz resonance chamber airflow channel, which can suppress the resonance peak of the front cavity and achieve a reduction in the high-frequency peak, thereby improving the sharpness of the human voice and obtaining better sound quality of the whole machine.

[0029] 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

[0030] 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:

[0031] Figure 1 is a cross-sectional view of an electronic device according to a first embodiment of the present invention;

[0032] Figure 2 is a cross-sectional view of an electronic device according to a second embodiment of the present invention;

[0033] Figure 3 Schematic diagram of the front sound outlet of an electronic device according to an embodiment of the present invention;

[0034] 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;

[0035] Figure 5 Schematic diagram of the rear sound outlet of an electronic device according to an embodiment of the present invention;

[0036] Figure 6 、 Figure 7 、 Figure 8 They are Figure 5 sectional view of

[0037] Figure 9 Schematic diagram of the explosion structure of a sound-emitting unit according to the first embodiment of the present invention;

[0038] Figure 10 A cross-sectional view of a sound-emitting unit according to embodiment 1 of the present invention;

[0039] Figure 11 Schematic diagram of the explosion structure of a sound-emitting unit according to the second embodiment of the present invention;

[0040] Figure 12 2 is a cross-sectional view of a sound-emitting unit according to the second embodiment of the present invention.

[0041] The reference numerals include: 1, first diaphragm, 11, first fold ring, 12, second fold ring, 13, first reinforcement part, 14, central dust screen,

[0042] 2. Second diaphragm, 21. Third fold, 22. Second reinforcement,

[0043] 3. First voice coil, 4. Second voice coil, 41. First magnetic gap, 42. Second magnetic gap,

[0044] 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. Protrusion, 56. First front cover, 561. Top plate, 562. Connecting plate, 563. Bottom plate, 57. Second front cover, 571. First sound outlet, 20. Magnet, 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;

[0045] 61. First bracket, 62. Second bracket, 63. First leakage hole, 64. Border dust screen,

[0046] 71. First positioning ring, 72. Second positioning ring,

[0047] 8. Back cover, 81. Second sound hole,

[0048] 9. Shell, 91. Front sound outlet, 92. Rear sound outlet, 93. Rear side sound outlet, 94. Helmholtz resonance chamber air flow channel, 95. Helmholtz resonance chamber, 96. Front cavity, 97. Rear cavity.

[0049] The same reference numerals throughout the drawings indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0050] 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.

[0051] 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.

[0052] In order to solve the aforementioned problem of resonance of the front cavity of the sound-emitting unit in the electronic device, the sensitivity produces resonance peaks, and the sound is prone to sharp and harsh, the present invention proposes an electronic device, wherein the electronic device can be a mobile phone, headphones, smart wearable devices, etc., which are not limited here.

[0053] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0054] To illustrate the structure of the electronic device provided by the present invention, Figures 1 to 12 The structures of the electronic device and the sound unit are illustrated from different angles. Figure 1 shows 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 figure shows a rear sound outlet structure of an electronic device according to an embodiment of the present invention; Figure 6 、 Figure 7 、 Figure 8 respectively Figure 5 Cross-sectional structure; Figure 9 The explosion structure of the sound-emitting monomer according to the first embodiment of the present invention is shown; Figure 10 The cross-sectional structure of the sound-emitting unit according to the first embodiment of the present invention is shown; Figure 11 The explosion structure of the sound-emitting monomer according to the second embodiment of the present invention is shown; Figure 12 The cross-sectional structure of the sound-emitting unit according to the second embodiment of the present invention is shown.

[0055] like Figures 1 to 12As 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, wherein 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 connected to the first diaphragm 1 and the second diaphragm 2 respectively, the first voice coil 3 is located in the first magnetic gap 41, and the second voice coil 4 is located in the second magnetic gap 41; 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, a front cavity 96 is formed between the first side of the first diaphragm 1 and the shell 9, and the first voice coil 3 is located in the second magnetic gap 41. A rear cavity 97 is formed between the second side of the second diaphragm 2 and the shell 9, and the front cavity 96 is isolated from the rear cavity 97; an air flow channel 30 is provided between the magnetic circuit system 5 and the first diaphragm 1 for the air flow of the second diaphragm 2 to flow out, and the sound waves of the second diaphragm 2 facing the first side are radiated outward through the air flow channel 30 and radiated to the front cavity 96 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 1 facing the second side are radiated to the rear cavity 97 together; a Helmholtz resonance cavity structure is provided in the front cavity 96, and the Helmholtz resonance cavity structure includes a Helmholtz resonance cavity 95 and a Helmholtz resonance cavity air flow channel 94 connected to the Helmholtz resonance cavity 95, and the sound waves of the front cavity 96 enter the Helmholtz resonance cavity 95 through the Helmholtz resonance cavity air flow channel 94.

[0056] In an embodiment of the present invention, the volume of the front cavity is V1, the volume of the Helmholtz resonance cavity is V2, the cross-sectional area of ​​the airflow channel is S, and the length of the airflow channel is L. By adjusting the cavity volume (V1, V2) and the cross-sectional area (S) and length (L) of the airflow channel of the Helmholtz resonance cavity, the resonant frequency is tuned to 0.5-4 times the fundamental frequency of the speaker, effectively suppressing the fundamental frequency resonance peak. Preferably, the resonant frequency can be tuned to 1.5-2 times the fundamental frequency of the speaker. Figure 2 : : shows the length of the Helmholtz resonance cavity air flow channel, and the area of ​​the cross section perpendicular to the axis of the Helmholtz resonance cavity air flow channel is the cross-sectional area S.

[0057] The ratio of the volume of the front cavity V1 to the volume of the Helmholtz resonance cavity V2 is 1:4-2:1. More specifically, the cross-sectional area S of the airflow channel of the Helmholtz resonance cavity is 0.05 mm 2 ~10mm 2 , such as: 0.05mm 2 , 0.7mm 2 , 1mm 2 , 2mm 2 , 3mm 2 , 5mm 2, 6mm 2 , 7mm 2 , 8mm 2 , 9mm 2 , 10mm 2 The length L of the Helmholtz resonance cavity airflow channel is 0.5 mm to 5 mm, such as 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, and 5 mm. In practical applications, the ratio of V1 to V2, the cross-sectional area S of the Helmholtz resonance cavity airflow channel, and the length L of the Helmholtz resonance cavity airflow channel are appropriately selected according to actual conditions to adjust the resonant frequency of the front cavity 96 and effectively suppress the fundamental frequency resonance peak.

[0058] In an embodiment of the present invention, the Helmholtz resonance cavity structure is a structure that achieves acoustic resonance through the interaction between the cavity volume and the cavity opening (airflow channel). Its resonant frequency is mainly determined by the cavity volume of the Helmholtz resonance cavity, the cross-sectional area of ​​the Helmholtz resonance cavity airflow channel, and the length of the Helmholtz resonance cavity airflow channel. The resonant frequency formula of the Helmholtz resonance cavity is:

[0059]

[0060] Wherein, c represents the speed of sound, S represents the cross-sectional area of ​​the airflow channel of the Helmholtz resonance cavity, V2 represents the volume of the Helmholtz resonance cavity, and L represents the length of the airflow channel of the Helmholtz resonance cavity.

[0061] In the present invention Figures 1 to 8 In the embodiment shown, the vibration system of the sound 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 sound 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 unit. The electronic device adopts the sound unit to improve the acoustic performance of the electronic device; by installing the sound unit in the receiving cavity of the shell 9 of the electronic device, the shell 9 is divided into a shell corresponding to the front cavity 96 and a shell corresponding to the rear cavity 97, and the Helmholtz resonance cavity structure is arranged inside the shell corresponding to the front cavity 96, and the Helmholtz resonance cavity structure and the shell corresponding to the front cavity 96 are an injection-molded integral structure.

[0062] like Figures 1 to 8As shown together, the Helmholtz resonance cavity airflow channel 94 is arranged on the injection molded body that forms the Helmholtz resonance cavity 95; wherein, when the number of the Helmholtz resonance cavity airflow channels 94 is multiple, the Helmholtz resonance cavity 95 forms a series cavity through the Helmholtz resonance cavity airflow channel, and the multiple series cavities are connected to the front cavity 96 through one Helmholtz resonance cavity airflow channel 94; or, the multiple Helmholtz resonance cavities 95 form a parallel cavity, and each Helmholtz resonance cavity 95 is connected to the front cavity 96 through a different Helmholtz resonance cavity airflow channel 94.

[0063] exist Figure 6 In the illustrated embodiment, the Helmholtz resonance cavity air flow channel 94 is opened on the injection molded body forming the Helmholtz resonance cavity body 95 , and there is only one Helmholtz resonance cavity air flow channel 94 , and the Helmholtz resonance cavity body 95 is a through cavity.

[0064] exist Figure 7 In the embodiment shown, there are two Helmholtz resonance cavities 95 , and two Helmholtz resonance cavity airflow channels 94 are opened on the injection molded body forming the Helmholtz resonance cavity 95 . The two Helmholtz resonance cavities 95 are connected in series through the two Helmholtz resonance cavity airflow channels 94 and are connected to the front cavity 96 .

[0065] exist Figure 8 In the embodiment shown, there are two Helmholtz resonance cavities 95, and two Helmholtz resonance cavity airflow channels 94 are opened on the injection molded body forming the Helmholtz resonance cavity 95. The two Helmholtz resonance cavities 95 are respectively connected to the front cavity 96 through the two Helmholtz resonance cavity airflow channels 94, and the two Helmholtz resonance cavities 95 form a parallel cavity.

[0066] comprehensive Figure 6 、 Figure 7 and Figure 8 In the embodiment, in a specific application, according to actual conditions, a suitable number of Helmholtz resonance cavity air flow channels 94 are selected, and the Helmholtz resonance cavities 95 are connected in series or in parallel with each other. By adjusting the cavity volume of the Helmholtz resonance cavity, the cross-sectional area of ​​the Helmholtz resonance cavity air flow channel and the length of the Helmholtz resonance cavity air flow channel, the resonant frequency of the Helmholtz resonance cavity structure is tuned, thereby achieving the reduction of high-frequency peaks, improving the sharpness of human voices, and obtaining better overall sound quality.

[0067] exist Figure 3 and Figure 4In the illustrated embodiment, the housing 9 is provided with a front sound outlet 91 that connects the front cavity 96 with the outside world. A rear positive sound outlet 92 is provided on the housing 9 at a position corresponding to the second diaphragm 2, connecting the rear cavity 97 with the outside world. A rear side sound outlet 93 is provided on the side of the housing 9, connecting to the outside world. It should be noted that the shape and number of the rear positive sound outlet 92 and the rear side sound outlet 93 are not specifically limited herein and can be selected as appropriate. These are not specifically limited herein.

[0068] In an embodiment of the present invention, the sound-emitting unit is installed in the receiving cavity of the shell 9 of the electronic device, so that the receiving cavity is divided into a front cavity and a rear cavity that are isolated from each other, and the sound-emitting unit adopts a double-sided vibration system, the first diaphragm 1 of the double-sided vibration system is a double-folded ring diaphragm, and the second diaphragm 2 is a single-folded ring diaphragm, and the sound waves on the first sides of the first diaphragm 1 and the second diaphragm 2 are radiated toward the front cavity 96 together, and the sound waves on the second sides are radiated toward the rear cavity 97 together. The shell 9 is provided with a front sound outlet 91 connected to the front cavity 96, and a rear sound outlet 97 is provided.

[0069] In an embodiment of the present invention, Figure 1 、 Figure 2 The electronic device with different sound-emitting monomer structures is shown. According to the needs, the double-sided sound-emitting monomers with different structures are installed in the receiving cavity of the housing 9 of the electronic device. The specific structure of the sound-emitting monomer can be set according to the actual situation. Figures 9 to 12 In 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 the 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, so as to form a dual diaphragm structure, so that a magnetic circuit system 5 is used to drive the two diaphragms (first diaphragm 1 and second diaphragm 2) of the two voice coil bands (first voice coil 3 and second voice coil 4) of the vibration system 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.

[0070] 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 and a cylindrical second bracket, with the first bracket 61 and the second bracket 62 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.

[0071] 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 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 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.

[0072] 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, so that the sound waves facing the first side of the second diaphragm 2 are radiated outward through the air flow channel 30 and radiated toward the first side together with the sound waves facing the first diaphragm surface 1 toward the first side, thereby realizing the superposition of sound waves of the first diaphragm 1 and the second diaphragm 2; when the sound wave airflow flows into the front cavity 96 through the air flow channel 30, the sound wave enters the Helmholtz resonance cavity through the Helmholtz resonance cavity air flow channel 94, and on the basis of improving its loudness and sensitivity, reduces the resonance peak of the front cavity, realizes the reduction of high-frequency peak, thereby improving the sharpness of human voice, and obtaining better overall sound quality.

[0073] 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.

[0074] In the present invention, the magnetic circuit system 5 includes a magnetic yoke 55, a central magnetic circuit and a side magnetic circuit arranged on the magnetic yoke 55, wherein the magnetic yoke 55 includes a central yoke plate 551, a side yoke plate 552 located outside the central yoke plate 551, and a connecting piece 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, the central magnetic circuit is arranged on the central yoke plate 551 and forms a second magnetic gap between the side yoke plate 552, the side magnetic circuit is arranged on the side yoke plate 552 and forms a first magnetic gap 41 between the side yoke plate 551, and the airflow channel 30 passes through the central yoke plate 551, the central magnetic circuit and the first diaphragm 1; wherein the formed airflow channel 30 effectively increases the airflow flow area when the second diaphragm 2 vibrates, thereby ensuring smoother airflow and improving the acoustic performance of the electronic device.

[0075] 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.

[0076] In embodiment one, the center yoke plate 551 has an extension portion 554 that bends and extends in a direction close to the first diaphragm 1, and the extension portion 554 is connected to the inner edge of the first diaphragm 1, specifically, the extension portion 554 is connected to the inner edge of the first fold ring 11; the center yoke plate 551 is integrally formed with the extension portion 554 connected to the inner edge of the first diaphragm 1, which is beneficial to simplify the number of components and improve the positioning accuracy during the assembly process. Among them, the air flow channel 30 includes a first through hole 31 that passes through the central magnetic circuit, a second through hole 32 that passes through the central yoke plate 551, and a third through hole 33 that passes through the first diaphragm 1, that is, the sound waves of 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 of the first diaphragm 1 facing the first side. Moreover, when the sound waves enter the front cavity 96, the sound waves enter the Helmholtz resonance cavity 95 through the Helmholtz resonance cavity air flow channel 94, which can suppress the resonance peak of the front cavity and achieve a reduction in the high-frequency peak value. That is, on the basis of improving the mid-frequency loudness performance after the superposition of the first diaphragm 1 and the second diaphragm 2, the sharpness of the human voice is improved to obtain better overall sound quality.

[0077] 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 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 is S1, and the area of ​​the surface of the center magnetic circuit facing the center yoke plate is S, where S1:S ≥ 50%.

[0078] 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.

[0079] 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.

[0080] In an embodiment of the present invention, a first front cover 56 is provided on the side of the center yoke plate 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 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 connects and secures the first diaphragm 1 and the center yoke plate 551, freeing up the outer shape 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 reducing reliability risks. At this point, 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.

[0081] 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 55. The fifth through hole 35 is located outside the raised portion 551. The fifth through hole 35 connects the second magnetic gap 42 and the first space 36 on either side, and the fourth through hole 34 and the third through hole 33 radiate toward the first side. Thus, the fifth through hole 35 connects the second magnetic gap 42 and the first space 36, ensuring smooth airflow within the magnetic gap beneath the second diaphragm 2 and improving the high-frequency performance of the second diaphragm 2. Sound waves entering the front cavity 96 enter the Helmholtz resonance cavity 95 through the Helmholtz resonance cavity airflow channel 94, suppressing the front cavity resonance peak and reducing the high-frequency peak.

[0082] 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 pass through the fourth through hole 34, and the sound waves entering the front cavity 96 enter the Helmholtz resonance cavity 95 through the Helmholtz resonance cavity air flow channel 94.

[0083] In Example 1 ( Figure 9 and Figure 10 ), the extension portion 554 and the center yoke plate 551 are integrally formed. Figure 11 and Figure 12 ), 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.

[0084] In implementation 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.

[0085] 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.

[0086] 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 air flow channel 30, 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.

[0087] 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 closed cavity is connected to the rear cavity 97 only through the first leakage hole 63.

[0088] Preferably, there are multiple first leakage holes 63, and the multiple first leakage holes 63 are symmetrically arranged along the circumference of the sound unit. 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 42 is formed between the central magnetic plate 53 and the side yoke plate 552, and a first magnetic gap 41 is formed between the side magnetic plate 51 and the central yoke plate 551. The side magnetic plate 51 is injection molded onto 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. Alternatively, the size of the leakage holes can be increased within a limited sound unit size to balance internal pressure.

[0089] 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 96 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. Moreover, when the sound waves of the first diaphragm 1 and the sound waves of the second diaphragm 2 enter the front cavity 96, the sound waves enter the Helmholtz resonance cavity through the Helmholtz resonance cavity air flow channel, which can suppress the resonance peak of the front cavity and reduce the high-frequency peak, thereby improving the sharpness of the human voice to obtain better sound quality of the whole machine.

[0090] 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.

[0091] 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.

[0092] 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 jointly emit sound toward the front cavity, and the second sides jointly emit sound toward the rear cavity; at the same time, a Helmholtz resonance chamber structure is provided in the front cavity, and the Helmholtz resonance chamber structure includes a Helmholtz resonance chamber airflow channel and a Helmholtz resonance cavity body. Sound waves enter the Helmholtz resonance cavity through the Helmholtz resonance chamber airflow channel, which can suppress the resonance peak of the front cavity and achieve a reduction in high-frequency peak value, thereby improving the sharpness of the human voice and obtaining better sound quality of the entire machine.

[0093] 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 unit includes a bracket and a magnetic circuit system and a vibration system connected to the bracket. The magnetic circuit system has a first magnetic gap and a second magnetic gap, and the first magnetic gap is 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 is located in the first magnetic gap, and the second voice coil is 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; a front cavity is formed between the first side of the first diaphragm and the shell, and a rear cavity is formed between the second side of the second diaphragm and the shell, and the front cavity and the rear cavity are isolated; an air flow channel for the outflow of air from the second diaphragm is provided between the magnetic circuit system and the first diaphragm; the sound waves of the second diaphragm facing the first side are radiated outward through the air flow channel and radiated toward the front cavity 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 rear cavity together; A Helmholtz resonance cavity structure is provided in the front cavity. The Helmholtz resonance cavity structure includes a Helmholtz resonance cavity body and a Helmholtz resonance cavity airflow channel connected to the Helmholtz resonance cavity body. The sound waves of the front cavity enter the Helmholtz resonance cavity through the Helmholtz resonance cavity airflow channel.

2. The electronic device according to claim 1, wherein The ratio of the volume of the front cavity to the volume of the Helmholtz resonance cavity is 1:4-2:1; And / or, the cross-sectional area of ​​the air flow channel of the Helmholtz resonance cavity is 0.05mm 2 ~10mm 2 ; And / or, the length of the air flow channel of the Helmholtz resonance cavity is 0.5 mm-5 mm.

3. The electronic device according to claim 1, wherein The Helmholtz resonance cavity structure and the housing are an integral injection-molded structure, and the Helmholtz resonance cavity airflow channel is provided on the injection-molded body forming the Helmholtz resonance cavity; And / or, there are multiple Helmholtz resonance cavities, and the Helmholtz resonance cavities form a series cavity, and the multiple series cavities are connected to the front cavity through one Helmholtz resonance cavity air flow channel; or, the multiple Helmholtz resonance cavities form a parallel cavity, and each Helmholtz resonance cavity is connected to the front cavity through a different Helmholtz resonance cavity air flow channel.

4. The electronic device according to claim 1, wherein: A front sound outlet hole communicating with the outside is provided on the front cavity shell; A rear positive sound outlet hole is provided on the rear cavity shell body which is connected to the outside and corresponds to the second diaphragm, and a rear side sound outlet hole which is connected to the outside is provided on the side surface of the rear cavity shell body.

5. 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.

6. The electronic device according to claim 5, characterized in that 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.

7. The electronic device according to claim 6, wherein: The center yoke plate has an extension portion that bends and extends toward the first diaphragm, the extension portion being connected to an inner edge of the first diaphragm, the airflow channel including a first through hole penetrating the center magnetic circuit, a second through hole penetrating the center yoke plate, and a third through hole penetrating the first diaphragm; And / or, the central area of ​​the central yoke plate protrudes toward the central magnetic circuit to form a protrusion, 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, the first front cover is connected to the inner edge of the first diaphragm, and 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.

8. The electronic device according to claim 7, 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%.

9. 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.

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 to the front cavity, and radiate a second sound wave to the rear cavity. The first sound wave and the second sound wave have opposite phases.

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