Loudspeaker module and wearable device

Abstract

The application discloses a loudspeaker module and a wearable device. The loudspeaker module comprises a module shell, an inside of the module shell forms a cavity, the module shell comprises oppositely arranged top and bottom walls, and the cavity is located between the top and bottom walls; and a sound emitting unit, the sound emitting unit is arranged in the cavity, the sound emitting unit comprises a first permanent magnet, a second permanent magnet and a diaphragm, the first permanent magnet is arranged on the top wall, the second permanent magnet is arranged on the bottom wall, the diaphragm comprises a film layer and a wire layer which are arranged in layers, at least part of the wire layer is located in a magnetic field formed by the first permanent magnet and the second permanent magnet, the diaphragm divides the cavity into a front sound cavity and a rear sound cavity, the volumes of the front sound cavity and the rear sound cavity are equal, and the module shell further comprises a sound outlet hole which is in communication with the front sound cavity and a sound leakage hole which is in communication with the rear sound cavity.

Description

Technical Field

[0001] This invention relates to the field of electroacoustic conversion technology, and more specifically, to a loudspeaker module and a wearable device. Background Technology

[0002] In related technologies, the structure of the vibration system and magnetic circuit system of loudspeakers, such as the speaker driver, is not symmetrical in the direction of vibration. This results in a significant difference in the characteristics of the sound waves radiated from the rear acoustic cavity of the loudspeaker module compared to those radiated from the front acoustic cavity, leading to poor sound quality when the two types of sound waves are superimposed. In addition, the inconsistent characteristics of the sound waves radiated from the front and rear acoustic cavities result in poor far-field noise reduction of the loudspeaker module.

[0003] Therefore, a new technical solution is needed to solve the above-mentioned technical problems. Summary of the Invention

[0004] One objective of this invention is to provide a new technical solution for speaker modules.

[0005] According to a first aspect of the present invention, a loudspeaker module is provided. The loudspeaker module includes:

[0006] A module housing, wherein a cavity is formed inside the module housing, the module housing includes a top wall and a bottom wall disposed opposite to each other, and the cavity is located between the top wall and the bottom wall; and

[0007] A sound-generating unit is disposed within the cavity. The sound-generating unit includes a first permanent magnet, a second permanent magnet, and a diaphragm. The first permanent magnet is disposed on the top wall, and the second permanent magnet is disposed on the bottom wall. The diaphragm includes a film layer and a conductor layer stacked together. At least a portion of the conductor layer is located in the magnetic field formed by the first and second permanent magnets. The diaphragm divides the cavity into a front acoustic cavity and a rear acoustic cavity, which have equal volumes. The module housing also includes a sound outlet communicating with the front acoustic cavity and a sound vent communicating with the rear acoustic cavity.

[0008] Optionally, the assembly consisting of the top wall and the first permanent magnet is symmetrically arranged with respect to the diaphragm as is the assembly consisting of the bottom wall and the second permanent magnet.

[0009] Optionally, the first permanent magnet and the second permanent magnet are disposed opposite to each other, and the polarities of the ends of the first permanent magnet and the second permanent magnet opposite to the diaphragm are the same.

[0010] Optionally, there are multiple first permanent magnets, which are spaced apart along a first direction on the top wall, and the polarities of the ends of two adjacent first permanent magnets opposite to those of the diaphragm are opposite.

[0011] Optionally, there are multiple second permanent magnets, which are spaced apart along the first direction on the top wall, and the polarities of the ends of two adjacent second permanent magnets opposite to those of the diaphragm are opposite.

[0012] Optionally, the first permanent magnet and the second permanent magnet are arranged in pairs, and the polarity of the ends of the first permanent magnet and the second permanent magnet opposite to the diaphragm is the same.

[0013] Optionally, at least a portion of the conductor layer is disposed along a second direction at a position opposite to the gap between the film layer and the plurality of first permanent magnets, wherein the second direction is perpendicular to the first direction.

[0014] Optionally, the conductor layer forms multiple conductors at positions opposite to the gaps between the film layer and the plurality of first permanent magnets.

[0015] Optionally, the sound outlet is disposed on the bottom wall, and the sound leakage outlet is disposed on the top wall.

[0016] Optionally, the module housing includes a first housing and a second housing connected together. The first housing includes a first sidewall and a top wall, and the first sidewall is connected to the top wall. The second housing includes a second sidewall and a bottom wall, and the second sidewall is connected to the bottom wall. The diaphragm is disposed between the first sidewall and the second sidewall.

[0017] According to another aspect of this application, a wearable device is provided. The device includes a device body and a speaker module provided in this application, the speaker module being connected to the device body.

[0018] Optionally, the device includes two speaker modules, one end of which is connected to the main body of the device, and the two speaker modules are used to clamp the wearer's head.

[0019] Optionally, the sound vent and the sound outlet are located at one end of the speaker module away from the main body of the device, with the sound outlet facing the wearer's ear and the sound vent facing away from the wearer's ear, and the sound vent and the sound outlet are symmetrically arranged.

[0020] In this embodiment, a sound-generating unit is disposed within the module housing. The diaphragm of the sound-generating unit divides the cavity within the module housing into a front acoustic cavity and a rear acoustic cavity. Since the first permanent magnet and the second permanent magnet are located on opposite sides of the diaphragm's vibration direction, the structure of the sound-generating unit has a high degree of symmetry, and the volumes of the front and rear acoustic cavities are equal. Therefore, the characteristics of the sound waves radiated outward through the sound outlet of the front acoustic cavity and the sound waves radiated outward through the sound vent of the rear acoustic cavity are very similar, resulting in excellent sound quality after the two sound waves are superimposed.

[0021] Furthermore, since the characteristics of the sound waves radiated from the front acoustic cavity and the sound waves radiated from the rear acoustic cavity are similar, the far-field noise reduction effect of the loudspeaker module is excellent.

[0022] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0024] Figure 1 This is a schematic diagram of wearing a wearable device according to an embodiment of this application.

[0025] Figure 2 This is a schematic diagram of a sound-generating unit according to an embodiment of this application.

[0026] Figure 3 This is a partial structural schematic diagram of a speaker module according to an embodiment of this application.

[0027] Figure 4 This is a schematic diagram of the structure of a speaker module according to an embodiment of this application.

[0028] Figure 5 This is a cross-sectional view of a speaker module according to an embodiment of this application.

[0029] Figure 6 This is a schematic diagram of the diaphragm structure according to an embodiment of this application.

[0030] Figure 7 These are the frequency response curves of the speaker modules in the embodiments and comparative examples of this application.

[0031] Figure 8 These are the frequency response curves of the sound leakage test of the speaker modules in the embodiments and comparative examples of this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Diaphragm; 11. Diaphragm layer; 12. Conductor layer; 121. Conductor; 21. First permanent magnet; 22. Second permanent magnet; 5. Sound outlet; 6. Sound leakage hole; 7. Speaker module; 71. First housing; 72. Second housing; 731. Top wall; 732. Bottom wall; 75. First side wall; 76. Second side wall; 8. Main body of the device; 9. Wearer. Detailed Implementation

[0034] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0035] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0036] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0037] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0039] According to one embodiment of this application, a speaker module 7 is provided. For example... Figures 1 to 5 As shown, the speaker module 7 includes:

[0040] A module housing, the interior of which forms a cavity, the module housing including a top wall 731 and a bottom wall 732 disposed opposite to each other, the cavity being located between the top wall 731 and the bottom wall 732; and

[0041] A sound-generating unit is disposed within the cavity. The sound-generating unit includes a first permanent magnet 21, a second permanent magnet 22, and a diaphragm 1. The first permanent magnet 21 is disposed on the top wall 731, and the second permanent magnet 22 is disposed on the bottom wall 732. The diaphragm 1 includes a film layer 11 and a conductor layer 12 stacked together. At least a portion of the conductor layer 12 is located in the magnetic field formed by the first permanent magnet 21 and the second permanent magnet 22. The diaphragm 1 divides the cavity into a front acoustic cavity and a rear acoustic cavity, which have equal volumes. The module housing also includes a sound outlet communicating with the front acoustic cavity and a sound vent communicating with the rear acoustic cavity.

[0042] Specifically, the module housing can be made of, but is not limited to, metal, plastic, rubber, etc. The module housing typically comprises multiple housings assembled together, for example, multiple housings connected by methods such as bonding, hot-melt connection, snap-fit, or ultrasonic welding. The sound outlet 5 communicates with the front acoustic cavity and is used for the speaker module 7 to radiate sound outwards. The sound vent 6 communicates with the rear acoustic cavity and is used to balance the sound pressure in front of and behind the diaphragm 1. The top wall 731 and bottom wall 732 are used to house permanent magnets. The top wall 731 and bottom wall 732 are arranged opposite each other, for example, the top wall 731 is parallel to the bottom wall 732. A cavity is formed between the top wall 731 and bottom wall 732.

[0043] The first permanent magnet 21 and the second permanent magnet 22 can be, but are not limited to, ferrite permanent magnets, neodymium iron boron permanent magnets, samarium cobalt permanent magnets, AlNiCo permanent magnets, etc. The first permanent magnet 21 is fixed to the top wall 731 by bonding, snapping, or other methods. The second permanent magnet 22 is fixed to the bottom wall 732 by bonding, snapping, or other methods. This arrangement of the first permanent magnet 21 and the second permanent magnet 22 provides a larger vibration space for the diaphragm 1.

[0044] Optionally, the top wall 731 and the bottom wall 732 are made of a magnetically conductive material, such as low-carbon steel. The magnetically conductive material can significantly increase the magnetic field strength formed by the first permanent magnet 21 and the second permanent magnet 22. For example, the first permanent magnet 21 is located in the front acoustic cavity, and the second permanent magnet 22 is located in the rear acoustic cavity; or the first permanent magnet 21 is located in the rear acoustic cavity, and the second permanent magnet 22 is located in the front acoustic cavity.

[0045] The diaphragm 1 includes a membrane layer 11 and a conductor layer 12. The membrane layer 11 and the conductor layer 12 are bonded together so that the diaphragm 1 as a whole has a diaphragm structure. For example, the conductor layer 12 is located on one side of the membrane layer 11, or the conductor layer 12 is sandwiched between multiple membrane layers 11. Figure 6 As shown, film layer 11 is a polymer material. The polymer material can be, but is not limited to, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyetherimide (PEI), and polyether ether ketone (PEEK). Conductor layer 12 can be, but is not limited to, metal, graphite, etc. For example, conductor layer 12 is formed on film layer 11 using circuit printing technology. Figure 2As shown, the energized wire 121 is subjected to electromagnetic force in the magnetic field of the first permanent magnet 21 and the second permanent magnet 22, vibrating in a direction perpendicular to the surface of the diaphragm 1. The vibration of the diaphragm 1 causes the air to vibrate and produce sound. The diaphragm 1 described above has a simple structure, is easy to manufacture, and has good durability. Of course, the structure of the diaphragm 1 is not limited to the above embodiment, and those skilled in the art can set it according to actual needs.

[0046] In this example, the sound-generating unit includes a diaphragm 1 and a first permanent magnet 21 and a second permanent magnet 22 located on both sides of the vibration direction of the diaphragm 1. The structure of this sound-generating unit has a high degree of symmetry, and the difference in sound wave characteristics on both sides of the vibration direction of the diaphragm 1 is small during vibration.

[0047] In this embodiment, a sound-generating unit is disposed within the module housing. The diaphragm 1 of the sound-generating unit divides the cavity within the module housing into a front acoustic cavity and a rear acoustic cavity. Since the first permanent magnet 21 and the second permanent magnet 22 are located on opposite sides of the vibration direction of the diaphragm 1, the structure of the sound-generating unit has a high degree of symmetry, and the volumes of the front and rear acoustic cavities are equal. Therefore, the characteristics of the sound waves radiated outward through the sound outlet 5 from the front acoustic cavity and the sound waves radiated outward through the sound vent 6 from the rear acoustic cavity are very similar, resulting in excellent sound quality after the two sound waves are superimposed.

[0048] Furthermore, since the characteristics of the sound waves radiated from the front acoustic cavity and the sound waves radiated from the rear acoustic cavity are similar, the far-field noise reduction effect of the speaker module 7 is excellent.

[0049] In one example, the assembly consisting of the top wall 731 and the first permanent magnet 21 is symmetrically arranged with respect to the diaphragm 1 as the assembly consisting of the bottom wall 732 and the second permanent magnet 22.

[0050] like Figure 3 , Figure 5 As shown, the diaphragm 1 is arranged parallel to the top wall 731 and the bottom wall 732. The top wall 731 and the bottom wall 732 are of equal size. The first permanent magnet 21 and the second permanent magnet 22 are strip-shaped permanent magnets. The first permanent magnet 21 is disposed on the top wall 731 to form a first component. The second permanent magnet 22 is disposed on the bottom wall 732 to form a second component. The first permanent magnet 21 and the second permanent magnet 22 are arranged opposite to each other. The distances of the first permanent magnet 21 and the second permanent magnet 22 from the diaphragm 1 are equal. The first component and the second component are symmetrically arranged with respect to the diaphragm 1, so that the remaining space of the front acoustic cavity and the rear acoustic cavity have equal volumes and the same structure. This makes the vibration space of the diaphragm 1 consistent on both sides of the vibration direction, and the characteristics of the sound waves radiated on both sides of the diaphragm 1 are more consistent. The far-field noise reduction effect of the speaker module 7 is better.

[0051] Furthermore, the distance between the diaphragm 1 and the top wall 731, and between the diaphragm 1 and the bottom wall 732, is 2mm to 10mm. Within this range, the volume occupied by the sound-generating unit in the front and rear acoustic cavities is small, the acoustic characteristics of the speaker module 7 are better, and the far-field noise reduction effect is better.

[0052] Of course, the distance between the diaphragm 1 and the electrode plate is not limited to the above embodiment, and those skilled in the art can set it according to actual needs.

[0053] In one example, the first permanent magnet 21 and the second permanent magnet 22 are arranged opposite to each other, and the polarities of the ends of the first permanent magnet 21 and the second permanent magnet 22 opposite to the diaphragm 1 are the same.

[0054] like Figure 3 , Figure 5 As shown, the first permanent magnet 21 and the second permanent magnet 22 are arranged opposite to each other. The polarities of the ends of the first permanent magnet 21 and the second permanent magnet 22 that are close to each other are the same, for example, both are N poles and both are S poles. In this way, the magnetic field formed by the two permanent magnets is symmetrical with respect to the diaphragm 1, thereby effectively increasing the magnetic flux density of the magnetic field formed by the first permanent magnet 21 and the second permanent magnet 22, and increasing the driving force for the vibration of the diaphragm 1.

[0055] Of course, in other examples, the first permanent magnet 21 and the second permanent magnet 22 may not be set opposite each other, and their polarities may be different, as long as the magnetic field formed by the two causes the diaphragm 1 to vibrate in a direction perpendicular to the surface of the diaphragm 1.

[0056] In one example, there are multiple first permanent magnets 21, which are spaced apart along a first direction on the top wall 731, and the polarities of the ends of two adjacent first permanent magnets 21 opposite to those of the diaphragm 1 are opposite.

[0057] like Figure 2 , Figure 3 , Figure 5 As shown, for example, the first direction is the long side direction of the top wall 731 or the bottom wall 732. In this direction, the first top wall 731 is provided with five first permanent magnets 21. The five first permanent magnets 21 are spaced apart. A gap is formed between two adjacent first permanent magnets 21. The polarities of the ends of two adjacent first permanent magnets 21 are opposite, for example, one is the N pole and the other is the S pole. This arrangement makes it possible to form a closed magnetic circuit between two adjacent first permanent magnets 21, thereby effectively increasing the magnetic field strength and making the direction of the magnetic field lines more parallel to the first direction. According to Ampere's law, after the conductor 121 is energized, the electromagnetic force on the diaphragm 1 is more likely to be perpendicular to the surface of the diaphragm 1.

[0058] This arrangement of the first permanent magnet 21 can significantly improve the driving force of the diaphragm 1 vibration, and the direction of the diaphragm 1 vibration is more in line with the ideal vibration state.

[0059] In one example, there are multiple second permanent magnets 22, which are spaced apart along a first direction on the top wall 731, and the polarities of the ends of two adjacent second permanent magnets 22 opposite to those of the diaphragm 1 are opposite.

[0060] like Figure 2 , Figure 3 , Figure 5 As shown, for example, the first direction is the long side direction of the top wall 731 or the bottom wall 732, the first direction is as follows: Figure 5 As shown in Figure A, five second permanent magnets 22 are disposed on the second top wall 731 in this direction. The five second permanent magnets 22 are spaced apart. A gap is formed between two adjacent second permanent magnets 22. The polarities of the ends of two adjacent second permanent magnets 22 are opposite, for example, one is the N pole and the other is the S pole. This arrangement forms a closed magnetic circuit between two adjacent second permanent magnets 22, thereby effectively increasing the magnetic field strength and making the direction of the magnetic field lines more parallel to the first direction. According to Ampere's law, after the conductor 121 is energized, the electromagnetic force on the diaphragm 1 is more likely to be perpendicular to the surface of the diaphragm 1.

[0061] Furthermore, the second permanent magnet 22 is positioned in the same manner as the first permanent magnet 21, and is located on both sides of the vibration direction of the diaphragm 1. This not only allows the magnetic fields of the two permanent magnets to superimpose, but also further concentrates the magnetic field lines, resulting in a stronger magnetic field. The direction of the magnetic field is more parallel to the first direction. This arrangement significantly increases the driving force of the diaphragm 1's vibration, and the direction of the diaphragm 1's vibration more closely matches the ideal vibration state.

[0062] In one example, the first permanent magnet 21 and the second permanent magnet 22 are arranged in pairs, and the polarity of the ends of the first permanent magnet 21 and the second permanent magnet 22 opposite to the diaphragm 1 is the same.

[0063] like Figure 2 , Figure 3 , Figure 5As shown, five first permanent magnets 21 are provided on the top wall 731. Five second permanent magnets 22 are provided on the bottom wall 732. The first permanent magnets 21 and the second permanent magnets 22 are arranged in pairs. The polarities of the paired permanent magnets are the same at the ends closest to each other, for example, both are N poles or both are S poles. In this arrangement, the paired first permanent magnets 21 and second permanent magnets 22 have the same polarity, which generates repulsion, thereby effectively compressing the magnetic field lines. This makes the magnetic field strength at the location of the conductor 121 stronger, and the magnetic field lines more closely parallel to the first direction.

[0064] Of course, in other examples, the first permanent magnet 21 and the second permanent magnet 22 can also be staggered. This arrangement can also form a magnetic field at the location of the wire 121 to drive the diaphragm 1 to vibrate perpendicularly to the surface of the diaphragm 1.

[0065] In one example, at least a portion of the conductor layer 12 is disposed along a second direction at a position opposite to the gap between the film layer 11 and the plurality of first permanent magnets 21, wherein the second direction is perpendicular to the first direction.

[0066] The second direction is as follows Figure 2 As shown in Figure B, in this example, the conductor 121 of the conductor layer 12 passes through the gap between adjacent first permanent magnets 21 along the second direction. At this location, the magnetic field strength formed by the first permanent magnet 21 and the second permanent magnet 22 is the maximum, and the direction of the magnetic field is parallel to the first direction. This arrangement results in a large vibration driving force for the diaphragm 1, and the vibration direction is perpendicular to the surface of the diaphragm 1.

[0067] Of course, the orientation of the conductor layer 12 is not limited to the above embodiment, and those skilled in the art can set it according to actual needs.

[0068] In one example, the conductor layer 12 forms multiple conductors 121 at positions opposite to the gaps between the plurality of first permanent magnets 21 in the film layer 11.

[0069] like Figure 2 As shown, in this example, a conductor 121 is alternately wound between multiple gaps, so that two parallel conductors 121 are formed in the same gap, and the current in the two conductors 121 is in the same direction. This arrangement results in a greater driving force on the diaphragm 1.

[0070] Of course, the winding method of the conductor 121 is not limited to the above embodiment, and those skilled in the art can set it according to actual needs. There can also be 3, 4, 5 or more conductors 121 in the same gap.

[0071] In one example, the sound outlet is located on the bottom wall 732, and the sound leakage outlet is located on the top wall 731.

[0072] like Figure 1 , Figure 4 As shown, a sound outlet is provided on the bottom wall 732, and a sound vent is provided on the top wall 731. The sound outlet and the sound vent are positioned opposite each other, and are symmetrically arranged. This ensures that the sound waves radiated outward from the sound outlet and the sound vent have opposite directions, preventing the sound waves from the sound vent from adversely affecting the sound waves from the sound outlet. This results in excellent sound quality from the speaker module.

[0073] In one example, the module housing includes a first housing 71 and a second housing 72 connected together. The first housing 71 includes a first sidewall 75 and a top wall 731, with the first sidewall 75 connected to the top wall 731. The second housing 72 includes a second sidewall 76 and a bottom wall 732, with the second sidewall 76 connected to the bottom wall 732. The diaphragm 1 is disposed between the first sidewall 75 and the second sidewall 76.

[0074] like Figure 4 , Figure 5 As shown, the diaphragm 1 is positioned between the first housing 71 and the second housing 72. The first housing 71 and the second housing 72 have identical structures. The first housing 71 and the second housing 72 are symmetrically arranged with respect to the diaphragm 1. This makes the structures of the front and rear acoustic cavities of the speaker module 7 more consistent, the sound wave radiation characteristics more consistent, and the far-field noise reduction effect better.

[0075] Of course, the structure of the first housing 71 and the second housing 72 is not limited here, and those skilled in the art can set it according to actual needs.

[0076] like Figure 5 As shown, both the first housing 71 and the second housing 72 have a flat structure. The top wall 731, the first side wall 75, the bottom wall 732, and the second side wall 76 are integrally formed, for example, by stamping or casting. Alternatively, the top wall 731, the first side wall 75, the bottom wall 732, and the second side wall 76 can be formed independently and then assembled together. The first side wall 75 and the second side wall 76 have a ring-shaped structure. The first housing 71 and the second housing 72 are insulated from each other. The top wall 731 and the bottom wall 732 are made of metal, and the first side wall 75 and the second side wall 76 are made of insulating material. Alternatively, both the first housing 71 and the second housing 72 can be made of metal and bonded together with insulating adhesive for insulation. The top wall 731, the first side wall 75, the bottom wall 732, and the second side wall 76 form a structure with one end open. The diaphragm 1 is bonded between the open end of the first housing 71 and the open end of the second housing 72. In this example, the first sidewall 75, the second sidewall 76, and the diaphragm 1 are bonded together with insulating adhesive. The first sidewall 75 and the second sidewall 76 effectively fix the diaphragm 1. This makes the speaker module more structurally robust.

[0077] Figure 7 These are the frequency response curves of the speaker modules in the embodiments and comparative examples of this application. Figure 8 These are the frequency response curves of the sound leakage test of the speaker modules in the embodiments and comparative examples of this application.

[0078] In this embodiment, the diaphragm 1 of the sound-generating device has a size of 35mm*25mm. Five first permanent magnets are spaced apart in the first housing. Five second permanent magnets are spaced apart in the second housing. The first and second permanent magnets are arranged in pairs. The distance from the top wall to the diaphragm 1 is 3mm, and the distance from the bottom wall to the diaphragm 1 is 3mm. The first housing 71 and the second housing 72 are symmetrically arranged.

[0079] In the comparative example, the speaker driver is a moving iron coil type. The speaker driver includes a vibration system and a magnetic circuit system. The vibration system includes a diaphragm and a voice coil. The diaphragm measures 35mm x 25mm. The magnetic circuit system includes a permanent magnet and a frame. The permanent magnet is mounted on the frame. The comparative speaker module includes two symmetrically arranged housings, with the speaker driver located between the two housings.

[0080] Figure 7 and Figure 8 The horizontal axis represents frequency (Hz), and the vertical axis represents sound pressure level (Db). Figure 7 It can be seen that, within the frequency range of 500Hz to 20kHz, the frequency response characteristics of the speaker module 7 in this embodiment have a flatter acoustic response than those of the comparative speaker module. Therefore, the audio reproduction performance of the speaker module 7 in this embodiment is superior.

[0081] Depend on Figure 8 It is evident that, within the frequency range of 100Hz to 4kHz, the speaker module 7 of this embodiment exhibits lower sound leakage compared to the comparative speaker module. The speaker module 7 of this embodiment is also more effective in protecting user privacy and reducing environmental noise generation.

[0082] According to another embodiment of this application, a wearable device is provided. The device includes a device body 8 and the speaker module 7 described in the embodiments of this application, the speaker module 7 being connected to the device body 8.

[0083] For example, wearable devices can be, but are not limited to, smartwatches, exoskeletons, smart glasses, virtual reality (VR) devices, augmented reality (AR) devices, etc.

[0084] This wearable device features excellent sound output.

[0085] In one example, the wearable device includes two speaker modules 7, one end of which is connected to the device body 8, and the two speaker modules 7 are used to clamp the head of the wearer 9.

[0086] like Figure 1 As shown, two speaker modules 7 are symmetrically arranged on both sides of the device body 8. The two speaker modules 7 are rotatably connected to the device body 8. The two speaker modules 7 can be folded and stored on the surface of the device body 8, or unfolded for use by the wearer 9. To accommodate the wearer 9, the speaker modules 7 are designed as elongated strips. The two speaker modules 7 function as the temples of eyeglasses. In use, the two speaker modules 7 hold the wearer 9's head, with the device body 8 positioned over the wearer 9's eyes. When the speaker modules 7 need maintenance, since the entire speaker module 7 acts as the temples, it is easy to detach and install them from the device body 8.

[0087] In this example, the speaker module 7 serves as the temple, which makes the wearable device simple in structure and easy to use.

[0088] In one example, the sound vent 6 and the sound outlet 5 are located at the end of the speaker module 7 away from the device body 8, the sound outlet 5 faces the ear side of the wearer 9, and the sound vent 6 faces the side away from the ear of the wearer 9. The sound vent 6 and the sound outlet 5 are arranged symmetrically.

[0089] like Figure 1 As shown, one end of the speaker module 7 is rotatably connected to the main body 8 of the device. The other end of the speaker module 7 is provided with a sound outlet 5 and a sound vent 6. The sound outlet 5 is close to the wearer's ear, which makes the wearer's hearing effect excellent. The sound vent 6 is away from the wearer's ear, so the sound waves from the sound vent 6 will not interfere with the sound waves from the sound outlet 5.

[0090] The vent hole 6 and the outlet hole 5 are symmetrically arranged in the width direction of the speaker module 7. Relative to the far field, the distance between the vent hole 6 and the outlet hole 5 is very close, which is equivalent to sound waves radiating from a single point, and the radiated sound waves are out of phase, which makes the far field noise reduction effect better.

[0091] The above embodiments mainly describe the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be elaborated here.

[0092] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A speaker module, characterized in that, include: A module housing, the interior of which forms a cavity, the module housing includes a top wall (731) and a bottom wall (732) disposed opposite to each other, the cavity being located between the top wall (731) and the bottom wall (732); as well as The sound-generating unit is disposed in the cavity. The sound-generating unit includes a first permanent magnet (21), a second permanent magnet (22), and a diaphragm. The first permanent magnet (21) is disposed on the top wall (731), and the second permanent magnet (22) is disposed on the bottom wall (732). The diaphragm includes a film layer and a conductor layer stacked together. At least a portion of the conductor layer is located in the magnetic field formed by the first permanent magnet (21) and the second permanent magnet (22). The diaphragm (1) divides the cavity into a front acoustic cavity and a rear acoustic cavity. The front acoustic cavity and the rear acoustic cavity have equal volumes. The module housing also includes a sound outlet (5) communicating with the front acoustic cavity and a sound vent (6) communicating with the rear acoustic cavity.

2. The speaker module according to claim 1, characterized in that, The assembly consisting of the top wall (731) and the first permanent magnet (21) is symmetrically arranged with respect to the diaphragm, as is the assembly consisting of the bottom wall (732) and the second permanent magnet (22).

3. The speaker module according to claim 1, characterized in that, The first permanent magnet (21) and the second permanent magnet (22) are arranged opposite to each other, and the polarities of the ends of the first permanent magnet (21) and the second permanent magnet (22) opposite to the diaphragm are the same.

4. The speaker module according to claim 1, characterized in that, There are multiple first permanent magnets (21), and the multiple first permanent magnets (21) are spaced apart on the top wall (731) along a first direction. The first direction is the long side direction of the top wall (731) or the bottom wall (732). The polarities of the ends of two adjacent first permanent magnets (21) opposite to the diaphragm are opposite.

5. The speaker module according to claim 4, characterized in that, There are multiple second permanent magnets (22), and the multiple second permanent magnets (22) are spaced apart on the bottom wall (732) along the first direction. The polarities of the ends of two adjacent second permanent magnets (22) opposite to the diaphragm are opposite.

6. The speaker module according to claim 5, characterized in that, The first permanent magnet (21) and the second permanent magnet (22) are arranged in pairs, and the polarity of the ends of the first permanent magnet (21) and the second permanent magnet (22) that are opposite to the diaphragm is the same.

7. The speaker module according to claim 6, characterized in that, The conductor layer includes multiple conductors, gaps are formed between multiple first permanent magnets (21), multiple conductors are formed on the film layer at positions opposite to the gaps, and the conductors extend along a second direction, wherein the second direction is perpendicular to the first direction.

8. The speaker module according to claim 1, characterized in that, The module housing includes a first housing (71) and a second housing (72) connected together. The first housing (71) includes a first sidewall (75) and a top wall (731), with the first sidewall (75) connected to the top wall (731). The second housing (72) includes a second sidewall (76) and a bottom wall (732), with the second sidewall (76) connected to the bottom wall (732). The diaphragm is disposed between the first sidewall (75) and the second sidewall (76).

9. A wearable device, characterized in that, It includes a device body and a speaker module as described in any one of claims 1 to 8, wherein the speaker module is connected to the device body.

10. The wearable device according to claim 9, characterized in that, It includes two speaker modules, one end of which is connected to the main body of the device. The two speaker modules are used to clamp the head of the wearer. The sound vent (6) and the sound outlet (5) are located at the end of the speaker module away from the main body of the device. The sound outlet (5) faces the side of the wearer's ear, and the sound vent (6) faces the side away from the wearer's ear. The sound vent (6) and the sound outlet (5) are symmetrically arranged.

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