Loudspeaker and wearable device

Abstract

The application discloses a loudspeaker and wearable equipment. The loudspeaker comprises a shell and a diaphragm arranged in the middle of the shell and separating the internal space of the shell into a first sub-cavity and a second sub-cavity arranged symmetrically; the first sub-cavity is provided with a first sound outlet, and the second sub-cavity is provided with a second sound outlet symmetrically collected with the first sound outlet; N first permanent magnets and N second permanent magnets are arranged, and the outer periphery of each permanent magnet is provided with a voice coil surrounding the permanent magnet; the first permanent magnets and the second permanent magnets are arranged symmetrically relative to the diaphragm; wherein the N first permanent magnets are arranged in the first sub-cavity and are arranged at intervals along a first direction of the loudspeaker; the N second permanent magnets are arranged in the second sub-cavity and are arranged at intervals along the first direction, and N is an integer greater than 1. The application realizes the improvement of the maximum volume of the loudspeaker under the premise of reducing the overall volume, improves the sound leakage protection effect of the loudspeaker, and solves the problem of high-frequency sound attenuation caused by the shielding of the sound outlet position of the magnetic circuit.

Description

Technical Field

[0001] This application generally relates to the field of sound-to-electricity conversion technology. More specifically, this application relates to a loudspeaker and a wearable device. Background Technology

[0002] XR products refer to products that integrate Virtual Reality (VR), Augmented Reality (AR), and Mixed Reality (MR) technologies. In XR products (such as smart glasses), the diaphragm in the speaker vibrates both forward and backward simultaneously, radiating sound in both directions. The sound radiated forward and backward is 180° out of phase. In the far field, the sound emitted from the front and rear cavity outlets of the speaker cancels out due to the 180° phase difference, thus preventing sound leakage. The front cavity outlet of the speaker is designed close to the ear, and the amplitude of the sound reaching the ear from the front cavity outlet is much greater than that from the rear cavity outlet, ensuring normal hearing for the user.

[0003] like Figure 1 As shown, the current loudspeaker has a different structure between the front and rear chambers; the front chamber is completely open (see [reference]). Figure 1 (a) The rear cavity has only a few sound outlets (see Figure 1 (b) causes inconsistencies in the frequency response of the front and rear cavities, resulting in significant differences in the sound emitted by the front and rear cavities in the far field. Consequently, the sounds emitted by the front and rear cavities cannot cancel each other out well in the far field, thus limiting the sound leakage protection effect; and as Figure 2 As shown, both the front and rear cavities of the speaker need to be equipped with sound guide cavities to guide the sound radiated from the rear cavity of the speaker to the rear sound outlet of the XR product and the sound radiated from the front cavity to the front sound outlet of the XR product, resulting in a larger overall size of the speaker; and the long axis design of the single magnetic circuit speaker will also block the sound outlet, thus leading to the attenuation of high frequency sound.

[0004] In view of this, there is an urgent need to provide a loudspeaker and wearable device that can increase the maximum volume of the loudspeaker unit while reducing the overall size of the device, improve the sound leakage protection of the loudspeaker, and solve the problem of high-frequency sound attenuation caused by the magnetic circuit blocking the sound outlet position. Utility Model Content

[0005] In order to at least solve one or more of the technical problems mentioned above, this application proposes a speaker and a wearable device in several aspects.

[0006] In a first aspect, this application provides a loudspeaker, comprising: a housing; and a diaphragm disposed in the middle of the housing, dividing the internal space of the housing into a first sub-cavity and a second sub-cavity, the first sub-cavity and the second sub-cavity being symmetrically arranged; the first sub-cavity having a first sound outlet, and the second sub-cavity having a second sound outlet; the first sound outlet and the second sound outlet being geometrically symmetrical; N first permanent magnets and N second permanent magnets, each permanent magnet having a voice coil surrounding it on its outer periphery, the first permanent magnets and the second permanent magnets being symmetrically arranged relative to the diaphragm; wherein the N first permanent magnets are located in the first sub-cavity and are spaced apart along a first direction of the loudspeaker; the N second permanent magnets are located in the second sub-cavity and are spaced apart along the first direction, and N is an integer greater than 1.

[0007] In some embodiments, the loudspeaker further includes a limiting component disposed in the outer peripheral region of the diaphragm for fixing the diaphragm.

[0008] In some embodiments, the limiting component includes: two symmetrical folded ring structures, the two folded ring structures being located on both sides of the diaphragm along a direction perpendicular to the diaphragm; wherein each folded ring structure includes: a first support plate, a second support plate, and a bent portion connecting the first support plate and the second support plate; the first sub-cavity has a first extension portion, the second sub-cavity has a second extension portion, the two first support plates are respectively connected to the first extension portion and the second extension portion, and the two symmetrical second support plates are used to clamp the diaphragm.

[0009] In some embodiments, the bend is arc-shaped, and the arc-shaped bend is concave to the extended surface of the diaphragm.

[0010] In some embodiments, the first permanent magnet and the second permanent magnet have the same polarity on the side closest to the diaphragm.

[0011] In some embodiments, the loudspeaker further includes: N+1 first magnetic conductive components and N+1 second magnetic conductive components, wherein the N+1 first magnetic conductive components are alternately arranged with N first permanent magnets along the first direction, and the N+1 second magnetic conductive components are alternately arranged with N second permanent magnets along the first direction.

[0012] In some embodiments, the loudspeaker further includes N+1 third permanent magnets and N+1 fourth permanent magnets, wherein the N+1 third permanent magnets are alternately arranged with N first permanent magnets along the first direction, and the N+1 fourth permanent magnets are alternately arranged with N second permanent magnets along the first direction.

[0013] In some embodiments, the polarity of the third permanent magnet and the fourth permanent magnet on the side closest to the diaphragm is the same, and the polarity of the side of the third permanent magnet closest to the diaphragm is opposite to the polarity of the side of its adjacent first permanent magnet closest to the diaphragm, and the polarity of the side of the fourth permanent magnet closest to the diaphragm is opposite to the polarity of the side of its adjacent second permanent magnet closest to the diaphragm.

[0014] In some embodiments, the first sound outlet is located on the side of the first sub-cavity along the first direction, and the second sound outlet is located on the side of the second sub-cavity along the first direction.

[0015] In a second aspect, this application provides a wearable device including a speaker as described in the first aspect or any of the embodiments of the first aspect.

[0016] Through the speaker and wearable device provided above, this embodiment of the application, by placing the diaphragm in the middle of the speaker housing, divides the internal space of the housing into symmetrical first and second sub-cavities, integrating front and rear closed cavities, thus eliminating the need for additional front and rear sound guide cavities, reducing the thickness of the speaker perpendicular to the diaphragm direction, and decreasing the overall size of the speaker; furthermore, the diaphragm has a completely symmetrical structure on its upper and lower sides, i.e., the first permanent magnet is located in the first sub-cavity and the second permanent magnet is located in the second sub-cavity. The first and second permanent magnets are symmetrically arranged relative to the diaphragm, allowing the diaphragm to vibrate simultaneously from both upper and lower directions, achieving a dual-drive design and improving the driving effect of the diaphragm. The force can produce a louder sound; combined with the first sub-cavity having a first sound outlet and the second sub-cavity having a second sound outlet that is geometrically symmetrical to the first sound outlet, the symmetrical design of the front and rear cavities, magnetic circuit, and sound outlets ensures that the frequency response of the sound emitted by the two sub-cavities is consistent, the sound cancellation in the far field is complete, and the sound leakage protection effect is improved; furthermore, the loudspeaker includes N first permanent magnets and N second permanent magnets, splitting the single magnetic circuit into multiple magnetic circuits, avoiding the problem of a single magnetic circuit blocking the sound outlet. At the same time, each permanent magnet is surrounded by a voice coil, which increases the length of the voice coil and the BL value of the magnetic circuit compared to a single magnetic circuit, which is conducive to increasing the driving force of the diaphragm and improving the maximum output sound pressure level. Attached Figure Description

[0017] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this application are illustrated by way of example and not limitation, and the same or corresponding reference numerals denote the same or corresponding parts, wherein: Figure 1 Example diagrams of the front and back of an existing speaker are shown; Figure 2A partial complete example diagram of an existing speaker is shown; Figure 3 A cross-sectional view along the minor axis of a loudspeaker including a diaphragm, a symmetrical sub-cavity, and a symmetrical sound outlet, according to some embodiments of this application, is shown. Figure 4 A cross-sectional view of a loudspeaker including a symmetrical permanent magnet along its long axis, according to some embodiments of this application, is shown. Figure 5 A top view of the interior of a speaker according to an embodiment of this application is shown; Figure 6 A cross-sectional view of a loudspeaker along its minor axis is shown for some embodiments of this application; Figure 7 An example diagram showing the voice coil current direction of some embodiments of this application is illustrated.

[0018] Explanation of reference numerals in the attached figures: Housing 310; Diaphragm 320; Sound outlet 330; First sound outlet 330-1; Second sound outlet 330-2; First sub-cavity 3101; Second sub-cavity 3102; Permanent magnet 340; First permanent magnet 340-1; Second permanent magnet 340-2; voice coil 350. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] It should be understood that the terms "comprising" and "including" used in the specification and claims of this application indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0021] It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this specification and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this specification and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0022] As used in this specification and claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0023] The specific embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0024] Exemplary application scenarios In XR products (such as smart glasses), the speaker is an important sound-generating device. Its working principle is that it vibrates forward and backward simultaneously during operation, radiating sound in both directions. The sound radiated forward and backward is 180° out of phase. In the far field, the sound emitted from the front and rear cavity outlets of the speaker cancels each other out due to the 180° phase difference, thus achieving sound leakage protection. The front cavity outlet of the speaker is designed to be close to the ear, and the amplitude of the sound emitted from the front cavity outlet reaching the ear is much greater than that of the sound emitted from the rear cavity outlet, thereby ensuring normal hearing for the user.

[0025] like Figure 1 As shown, the front cavity of the current speaker is completely open (see...). Figure 1 (a) The rear cavity has only a few sound outlets (see Figure 1 (b) That is, the structure of the front cavity and the rear cavity are different, which leads to the inconsistency of the frequency response of the sound emitted from the front cavity and the rear cavity. This results in a large difference in the far field point of the sound emitted by the front and rear cavities. Consequently, the sound emitted by the front and rear cavities cannot be well short-circuited and canceled in the far field, thus the sound leakage protection effect is limited. In addition, the design of the single magnetic circuit along the long axis of the loudspeaker will also block the sound outlet, which will lead to the attenuation of high frequency sound.

[0026] Furthermore, such as Figure 2 As shown, the sound emitted from the rear cavity of the speaker needs to be encased in a plastic shell to guide the sound radiated from the rear cavity of the speaker to the rear sound outlet of the XR product. Similarly, a front sound cavity needs to be designed to guide the sound radiated forward by the speaker to the front sound outlet of the XR product. The design of the front and rear sound cavities increases the thickness of the speaker, affecting the miniaturization of the product. In addition, the long axis design of the single magnetic circuit speaker will also block the sound outlet, resulting in the attenuation of high-frequency sound.

[0027] Based on the existing problems of insufficient sound leakage protection, large size, and blocked sound outlet of loudspeakers, this application provides a loudspeaker that can increase the maximum volume of the speaker unit while reducing the overall size, improve the sound leakage protection of the loudspeaker, and solve the problem of high-frequency sound attenuation caused by the magnetic circuit blocking the sound outlet position.

[0028] Figure 3-6 The diagram shows an example of the structure of a speaker according to some embodiments of this application.

[0029] like Figure 3-6 The loudspeaker includes a housing 310 and a diaphragm 320 disposed in the middle of the housing 310, dividing the internal space of the housing 310 into a first sub-cavity 3101 and a second sub-cavity 3102, the first sub-cavity 3101 and the second sub-cavity 3102 being symmetrically arranged; the first sub-cavity 3101 is provided with a first sound outlet 330-1, and the second sub-cavity 3102 is provided with a second sound outlet 330-2; the first sound outlet 330-1 and the second sound outlet 330-2 are geometrically symmetrical. N first permanent magnets 340-1 and N second permanent magnets 340-2, each permanent magnet having a voice coil 350 surrounding it. The first permanent magnets 340-1 and the second permanent magnets 340-2 are symmetrically arranged with respect to the diaphragm 320. The N first permanent magnets 340-1 are located within the first sub-cavity 3101 and are spaced apart along the first direction of the loudspeaker. The N second permanent magnets 340-2 are located within the second sub-cavity 3102 and are spaced apart along the first direction.

[0030] Exemplarily, the speaker housing 310 serves as the external frame of the speaker, and its material can include, but is not limited to, magnetically conductive materials such as metal, alloy, magnetically conductive plastic, and magnetically conductive rubber, to form a complete magnetic circuit together with the permanent magnet. In this embodiment, the housing 310 can be a one-piece molded structure. Its shape can be various, such as a cuboid, a sphere, etc. This embodiment does not specifically limit this; this embodiment only describes the housing 310 as a cuboid shape.

[0031] For example, the diaphragm 320 is a key component in the loudspeaker that generates sound. It is disposed in the middle of the housing 310, for example, it can be disposed horizontally in the middle of the housing 310, or it can be disposed vertically in the middle of the housing 310, etc., thereby dividing the internal space of the housing 310 into two symmetrical sub-cavities, namely the first sub-cavity 3101 and the second sub-cavity 3102. Here, symmetry means that the first sub-cavity 3101 and the second sub-cavity 3102 are mirror images of each other in shape and volume with respect to the plane in which the diaphragm 320 is located or its extended plane.

[0032] In this embodiment, by placing the diaphragm 320 in the middle of the housing 310, the internal space of the housing 310 is divided into two symmetrical sub-cavities. These two sub-cavities serve as sound guide cavities, eliminating the need for additional sound guide cavities. This reduces the thickness of the speaker perpendicular to the diaphragm direction and decreases the overall size of the speaker.

[0033] In this embodiment, the diaphragm 320 can be made of a lightweight, highly elastic material, such as polyimide film, polyethylene terephthalate film, polyethylene naphthalate film, etc.

[0034] In this embodiment, a first sound outlet 330-1 is provided on the first sub-cavity 3101, and a second sound outlet 330-2 is provided on the second sub-cavity 3102. The first sound outlet 330-1 and the second sound outlet 330-2 are geometrically symmetrical. Here, geometric symmetry means that the first sound outlet 330-1 and the second sound outlet 330-2 can overlap after a specific transformation. Therefore, the shape and size of the first sound outlet 330-1 and the second sound outlet 330-2 are the same, realizing symmetrical sound field output.

[0035] For example, the first permanent magnet 340-1 and the second permanent magnet 340-2 can be, but are not limited to, ferrite permanent magnets, neodymium iron boron permanent magnets, samarium cobalt permanent magnets, AlNiCo permanent magnets, etc.

[0036] In the embodiments of this application, such as Figure 5 As shown, each permanent magnet 340 (including the first permanent magnet 340-1 and the second permanent magnet 340-2) is fitted with a voice coil 350 on its outer periphery. The voice coil 350 serves as the core driving component of the loudspeaker and can be electrically connected to an external driving circuit. When a changing audio current is applied, it will be subjected to a Lorentz force in the magnetic field provided by the permanent magnet 340, thereby driving the diaphragm 320 connected to it to vibrate and produce sound.

[0037] The outer periphery of the aforementioned permanent magnet 340 refers to the area composed of the other four surfaces of the permanent magnet, excluding the top and bottom surfaces.

[0038] This embodiment of the application sets up multiple permanent magnets 340, and a voice coil 350 is sleeved on the outer periphery of each permanent magnet, so that the magnetic circuit will not block the sound outlet 330. Moreover, by changing a single magnetic circuit to multiple magnetic circuits, the length of the voice coil 350 is increased compared to a single magnetic circuit, and the BL value of the magnetic circuit is improved, which can provide greater driving force for the diaphragm 320.

[0039] The number of the first permanent magnet 340-1 and the second permanent magnet 340-2 is the same, both being N, where N is an integer greater than 1, for example, N is 2, or N is 3. This embodiment of the application will only use N as an example for illustration.

[0040] In the embodiments of this application, such as Figure 4 As shown, N first permanent magnets 340-1 are located inside the first sub-cavity 3101 and are spaced apart along the first direction of the speaker. N second permanent magnets 340-2 are located inside the second sub-cavity 3102 and are also arranged symmetrically along the first direction, corresponding one-to-one with the N first permanent magnets 340-1. That is, the entire magnetic circuit structure of the diaphragm 320 is set to be completely symmetrical. This can ensure the consistency of the acoustic path in the first sub-cavity 3101 and the second sub-cavity 3102, and can also realize the dual-sided driving of the diaphragm 320, increasing the driving force on the diaphragm 320.

[0041] Taking a loudspeaker with a cuboid shape as an example, the first direction mentioned above refers to the long axis direction of the loudspeaker. For example... Figure 4 As shown, the first direction is the long axis direction of the speaker (i.e., Figure 4 The first direction is the X-axis direction, and the second direction is the short axis direction of the speaker (i.e., the X-axis direction). Figure 4 The Y-axis direction in the image), and the third direction is the height direction of the speaker (i.e., Figure 4 (Z-axis direction in the image). The major axis of the first permanent magnet 340-1 and the major axis of the second permanent magnet 340-2 can be set to be parallel to the Y-axis direction to avoid the permanent magnet 340 from blocking the sound outlet 330.

[0042] This embodiment of the application places the diaphragm in the middle of the speaker housing, dividing the internal space of the housing into symmetrical first and second sub-cavities. It integrates front and rear closed cavities, thus eliminating the need for additional front and rear sound guide cavities, reducing the speaker's thickness perpendicular to the diaphragm (i.e., the length in the Z-axis direction), and decreasing the overall size of the speaker. Furthermore, the diaphragm has completely symmetrical structures on its upper and lower sides; that is, the first permanent magnet is located in the first sub-cavity, and the second permanent magnet is located in the second sub-cavity. The first and second permanent magnets are symmetrically arranged relative to the diaphragm, allowing simultaneous vibration of the diaphragm from both the upper and lower directions, achieving a dual-drive design and improving the diaphragm's driving force. It produces a louder sound; combined with the first sub-cavity having a first sound outlet and the second sub-cavity having a second sound outlet that is geometrically symmetrical to the first sound outlet, the symmetrical design of the front and rear cavities, magnetic circuit, and sound outlets ensures that the frequency response of the sound emitted by the two sub-cavities is consistent, the sound cancellation in the far field is complete, and the sound leakage protection effect is improved; furthermore, the loudspeaker includes N first permanent magnets and N second permanent magnets, splitting the single magnetic circuit into multiple magnetic circuits, avoiding the problem of the single magnetic circuit blocking the sound outlet. At the same time, each permanent magnet is surrounded by a voice coil, which increases the length of the voice coil and the BL value of the magnetic circuit compared to the single magnetic circuit, which is conducive to increasing the driving force of the diaphragm and improving the maximum output sound pressure level.

[0043] As an optional embodiment of this application, the speaker further includes: a limiting component disposed in the outer peripheral region of the diaphragm 320 for fixing the diaphragm 320.

[0044] For example, the aforementioned limiting component is an auxiliary structural component used to limit the position of the diaphragm 320 and prevent the diaphragm 320 from excessively shifting or tilting when vibrating. It is disposed in the outer peripheral region of the diaphragm 320. It can completely cover the outer peripheral region of the diaphragm 320 or partially cover the outer peripheral region of the diaphragm 320. This application embodiment does not specifically limit this.

[0045] As a specific implementation of this application, the above-mentioned limiting component covers both sides of the diaphragm 320, such as the left and right sides, the front and back sides, etc. Preferably, the above-mentioned limiting component covers the left and right sides of the diaphragm 320 to ensure that the sound radiated to the left and right sides when the diaphragm 320 vibrates is consistent.

[0046] As another specific embodiment of this application, the above-mentioned limiting component completely covers the outer peripheral area of ​​the diaphragm 320.

[0047] In the embodiments of this application, such as Figure 6 As shown, the limiting component includes: two symmetrical folded ring structures 360, which are located on both sides of the diaphragm 320 along a direction perpendicular to the diaphragm 320; a first sub-cavity 3101 has a first extension, a second sub-cavity 3102 has a second extension, two first support plates are connected to the first extension and the second extension respectively, and two symmetrical second support plates are used to clamp the diaphragm 320.

[0048] For example, the folded ring structure 360 ​​includes a first support piece, a second support piece, and a bent portion connecting the first and second support pieces. In the embodiments of this application, the first and second support pieces can be rigid support portions for connection with the extension portion of the sub-cavity; the bent portion can be an arc-shaped surface or a folded surface connecting the two support pieces.

[0049] Two symmetrical folded ring structures 360 are located on both sides of the diaphragm 320 in a direction perpendicular to the diaphragm 320. They can provide two support points for the diaphragm 320 in a direction perpendicular to the diaphragm 320, preventing the diaphragm 320 from polarization and rolling vibration under large amplitude, which is conducive to improving the maximum sound pressure level.

[0050] In this embodiment, the first sub-cavity 3101 has a first extension and the second sub-cavity 3102 has a second extension. Here, the first extension and the second extension refer to the connecting structure of the first sub-cavity 3101 and the second sub-cavity 3102 extending outward from the outer periphery of the diaphragm 320, which is used to assemble the support piece of the folded ring structure 360.

[0051] In this embodiment of the application, the two first supports are respectively connected to the first extension and the second extension, such as... Figure 6 As described, one of the first support pieces is connected to the first extension, and the other first support piece is connected to the second extension. Specifically, the connection between the two first support pieces and the first and second extensions can be fixed by means of adhesive bonding, snap-fitting, etc., to form a stable assembly relationship; and the two symmetrical second support pieces clamp the outer peripheral area of ​​the diaphragm 320, thereby fixing the edge of the diaphragm 320.

[0052] As an optional embodiment of this application, the bent portion is arc-shaped, with the arc-shaped bend concave towards the extended surface of the diaphragm 320.

[0053] For example, the arc-shaped bend has good elastic deformation capability, which can adapt to the larger amplitude vibration of the diaphragm 320.

[0054] In this embodiment, the extended surface of the diaphragm 320 refers to the virtual plane formed by extending to both sides of the plane where the diaphragm 320 is located, and in this embodiment, the arc-shaped bend is concave to the extended surface of the diaphragm 320.

[0055] As an optional embodiment of this application, the polarities of the first permanent magnet 340-1 and the second permanent magnet 340-2 on the side closest to the diaphragm 320 are the same.

[0056] For example, in this embodiment of the application, the polarity of the side of the first permanent magnet 340-1 near the diaphragm 320 is the same as the polarity of the side of the second permanent magnet 340-2 near the diaphragm 320. Figure 7 The polarity of the first permanent magnet (the larger permanent magnet in the first sub-cavity) near the diaphragm is N, and the polarity of the second permanent magnet (the larger permanent magnet in the second sub-cavity) near the diaphragm is also N; and the polarities of the N first permanent magnets 340-1 near the diaphragm 320 are also the same, as are the polarities of the N second permanent magnets 340-2 near the diaphragm 320.

[0057] As a specific embodiment of this application, the polarity of the first permanent magnet 340-1 is N pole on the side close to the diaphragm 320 and S pole on the side away from the diaphragm 320. Then the polarity of the second permanent magnet 340-2 is also N pole on the side close to the diaphragm 320 and S pole on the side away from the diaphragm 320.

[0058] As another specific embodiment of this application, the polarity of the first permanent magnet 340-1 is S pole on the side close to the diaphragm 320 and N pole on the side away from the diaphragm 320. Then the polarity of the second permanent magnet 340-2 is also S pole on the side close to the diaphragm 320 and N pole on the side away from the diaphragm 320.

[0059] In this embodiment, by setting the polarity of the first permanent magnet 340-1 and the second permanent magnet 340-2 to be the same on the side near the diaphragm 320, a symmetrical magnetic field of the same polarity can be formed on both sides of the diaphragm 320. When the voice coil 350 is energized, according to the left-hand rule, the voice coils 350 on both sides of the diaphragm 320 will receive forces in the same direction, thereby driving the diaphragm 320 to vibrate simultaneously in both the upper and lower directions, increasing the driving force of the diaphragm 320, and enabling the diaphragm 320 to emit a louder sound and output a higher sound pressure level.

[0060] As an optional embodiment of this application, the speaker further includes: N+1 first magnetic conductive components and N+1 second magnetic conductive components, wherein the N+1 first magnetic conductive components are alternately arranged with N first permanent magnets 340-1 along a first direction, and the N+1 second magnetic conductive components are alternately arranged with N second permanent magnets 340-2 along the first direction.

[0061] For example, the magnetic guiding component is a part made of a high magnetic permeability material. Specifically, the magnetic guiding component can be made of soft magnetic materials (e.g., pure iron, silicon steel, etc.). It can efficiently guide and concentrate the magnetic field, reduce magnetic leakage, and improve the magnetic field utilization rate of the permanent magnet.

[0062] In this embodiment, N+1 first magnetic conductive components are alternately arranged with N first permanent magnets 340-1 along a first direction, forming a structure of first magnetic conductive component-first permanent magnet 340-1-first magnetic conductive component-first permanent magnet 340-1-first magnetic conductive component-first permanent magnet 340-1-first magnetic conductive component-first permanent magnet 340-1...first magnetic conductive component arrangement.

[0063] N+1 second magnetic conductive components are alternately arranged with N second permanent magnets 340-2 along the first direction, forming a structure of second magnetic conductive component-second permanent magnet 340-2-second magnetic conductive component-second permanent magnet 340-2-second magnetic conductive component-second permanent magnet 340-2-second magnetic conductive component-second permanent magnet 340-2... second magnetic conductive component arrangement.

[0064] Furthermore, the aforementioned N+1 first magnetic conductive components and N+1 second magnetic conductive components are also symmetrically arranged relative to the diaphragm 320.

[0065] In this embodiment, by adding a first magnetic conductive component and a second magnetic conductive component, the magnetic field of the permanent magnet (including the first permanent magnet 340-1 and the second permanent magnet 340-2) can be concentrated, reducing magnetic field leakage, increasing the magnetic field density around the permanent magnet, and enhancing the electromagnetic force in the voice coil 350; and by using alternating designs of permanent magnets and magnetic conductive components, the magnetic field distribution becomes more uniform, avoiding excessively strong or weak local magnetic fields, and improving the consistency of the force on the voice coil 350.

[0066] As an optional embodiment of this application, such as Figure 4as well as Figure 7 As shown, the speaker also includes N+1 third permanent magnets and N+1 fourth permanent magnets, wherein the N+1 third permanent magnets are alternately arranged with N first permanent magnets 340-1 along the first direction, and the N+1 fourth permanent magnets are alternately arranged with N second permanent magnets 340-2 along the first direction.

[0067] For example, such as Figure 4 or Figure 7 As shown, N+1 third permanent magnets (smaller permanent magnets in the first sub-cavity) are alternately arranged with N first permanent magnets 340-1 along the first direction, which can form a structure of third permanent magnet - first permanent magnet 340-1 - third permanent magnet - first permanent magnet 340-1 - third permanent magnet - first permanent magnet 340-1... third permanent magnet arrangement.

[0068] N+1 fourth permanent magnets (smaller permanent magnets in the second sub-cavity) are alternately arranged with N second permanent magnets 340-2 along the first direction, forming a structure of fourth permanent magnet - second permanent magnet 340-2 - fourth permanent magnet - second permanent magnet 340-2 - fourth permanent magnet - second permanent magnet 340-2... fourth permanent magnet arrangement.

[0069] Furthermore, the aforementioned N+1 third permanent magnets and N+1 fourth permanent magnets are also symmetrically arranged relative to the diaphragm 320.

[0070] In the embodiments of this application, the third permanent magnet and the fourth permanent magnet are opposite permanent magnets to the first permanent magnet 340-1 and the second permanent magnet 340-2. That is, the polarity of the side of the third permanent magnet and the fourth permanent magnet near the diaphragm 320 is the same, and the polarity of the side of the third permanent magnet near the diaphragm 320 is opposite to the polarity of the side of the adjacent first permanent magnet 340-1 near the diaphragm 320. The polarity of the side of the fourth permanent magnet near the diaphragm 320 is opposite to the polarity of the side of the adjacent second permanent magnet 340-2 near the diaphragm 320.

[0071] like Figure 7 As shown, the polarity of the first permanent magnet 340-1 near the diaphragm is N pole, and the polarity of the third permanent magnet near the diaphragm is S pole; the polarity of the second permanent magnet 340-2 near the diaphragm is N pole, and the polarity of the fourth permanent magnet near the diaphragm is S pole.

[0072] based on Figure 7 The structural example diagram shown is as follows. Figure 7In the diagram, "." indicates that the current direction in the voice coil is outward, and "×" indicates that the current direction is inward. After energization, the voice coil experiences a Lorentz force in the magnetic field of the permanent magnet 340, causing the diaphragm 320 to vibrate. The red arrows in the diagram indicate the magnetic circuit direction; that is, outside the permanent magnet 340, the magnetic field lines point from the N pole to the S pole, and inside the permanent magnet 340, the magnetic field lines return from the S pole to the N pole, thus forming... Figure 7 The closed magnetic circuit is shown.

[0073] In this embodiment, by introducing a third permanent magnet alternating with the first permanent magnet 340-1 and a fourth permanent magnet alternating with the second permanent magnet 340-2, the magnetic field coverage along the first direction is wider, increasing the force-bearing area of ​​the voice coil 350 and enhancing the driving force of the diaphragm 320. Furthermore, the magnetic field along the first direction exhibits a uniform change, making the force on the voice coil 350 more stable, thereby making the amplitude and frequency of the diaphragm 320 vibration more stable. In addition, the opposite polarities of adjacent permanent magnets generate an attractive force, forming a stronger composite magnetic field and enhancing the driving force.

[0074] Considering the small size along the minor axis, which is not conducive to setting the sound outlet, and that setting the sound outlet 330 along the minor axis would increase the distance between the front and rear sound outlets, which is not conducive to far-field phase cancellation and sound leakage protection, the sound outlet 330 in this embodiment is located on the side of the speaker along the first direction. Specifically, as follows: As an optional embodiment of this application, such as Figure 3 as well as Figure 6 As shown, the first sound outlet 330-1 is located on the side of the first sub-cavity 3101 along the first direction, and the second sound outlet 330-2 is located on the side of the second sub-cavity 3102 along the first direction.

[0075] For example, in order to better match the form of electronic devices (e.g., smart glasses) with the speaker, the first sound outlet 330-1 in this embodiment is located on the side of the first sub-cavity 3101 along the first direction, and the second sound outlet 330-2 is located on the side of the second sub-cavity 3102 along the first direction. This avoids the problem of mid-to-high frequency attenuation caused by sound emanating from the small hole on the back of the speaker. As a result, the sound radiated forward and backward by the diaphragm 320 is closer together, and the anti-phase sound radiated forward and backward can be more effectively superimposed and canceled, so as to improve the sound leakage protection effect of the product.

[0076] It should be noted that when the above-mentioned sound outlet 330 is set on the side of the sub-cavity along the first direction, a larger sound outlet 330 can be set compared to setting the sound outlet on the side along the second direction. The larger sound outlet 330 can export sound, and the larger sound outlet 330 has less obstruction, making it easier to export high-frequency sound, and the exported sound is louder and attenuation is reduced.

[0077] This application also provides a wearable device, which includes the antenna speaker described in the above embodiments. The wearable device may include, but is not limited to, AR glasses, VR glasses, MR glasses, smartwatches, etc.

[0078] While numerous embodiments of this application have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will arise for those skilled in the art without departing from the spirit and intent of this application. It should be understood that various alternatives to the embodiments of this application described herein may be employed in the practice of this application. The appended claims are intended to define the scope of protection of this application and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A loudspeaker, characterized in that, include: case; as well as A diaphragm is disposed in the middle of the housing, dividing the internal space of the housing into a first sub-cavity and a second sub-cavity, the first sub-cavity and the second sub-cavity being symmetrically arranged; the first sub-cavity is provided with a first sound outlet, and the second sub-cavity is provided with a second sound outlet; The first sound outlet and the second sound outlet are geometrically symmetrical; N first permanent magnets and N second permanent magnets, each permanent magnet having a voice coil surrounding it on its outer periphery, the first permanent magnets and the second permanent magnets being symmetrically arranged with respect to the diaphragm; The N first permanent magnets are located in the first sub-cavity and are spaced apart along the first direction of the speaker; the N second permanent magnets are located in the second sub-cavity and are spaced apart along the first direction, where N is an integer greater than 1.

2. The loudspeaker according to claim 1, characterized in that, The loudspeaker further includes a limiting component disposed in the outer peripheral region of the diaphragm for fixing the diaphragm.

3. The loudspeaker according to claim 2, characterized in that, The limiting component includes two symmetrical folded ring structures, which are located on both sides of the diaphragm along a direction perpendicular to the diaphragm. Each folded ring structure includes: a first support piece, a second support piece, and a bent portion connecting the first support piece and the second support piece; The first sub-cavity has a first extension, the second sub-cavity has a second extension, the two first support plates are respectively connected to the first extension and the second extension, and the two symmetrical second support plates are used to clamp the diaphragm.

4. The loudspeaker according to claim 3, characterized in that, The bent portion is arc-shaped, and the arc-shaped bent portion is concave to the extended surface of the diaphragm.

5. The loudspeaker according to claim 1, characterized in that, The first permanent magnet and the second permanent magnet have the same polarity on the side closest to the diaphragm.

6. The loudspeaker according to claim 1, characterized in that, The loudspeaker further includes: N+1 first magnetic conductive components and N+1 second magnetic conductive components, wherein the N+1 first magnetic conductive components are alternately arranged with N first permanent magnets along the first direction, and the N+1 second magnetic conductive components are alternately arranged with N second permanent magnets along the first direction.

7. The loudspeaker according to claim 1, characterized in that, The loudspeaker further includes N+1 third permanent magnets and N+1 fourth permanent magnets, wherein the N+1 third permanent magnets are alternately arranged with N first permanent magnets along the first direction, and the N+1 fourth permanent magnets are alternately arranged with N second permanent magnets along the first direction.

8. The loudspeaker according to claim 7, characterized in that, The third permanent magnet and the fourth permanent magnet have the same polarity on the side closest to the diaphragm, and the polarity of the third permanent magnet on the side closest to the diaphragm is opposite to the polarity of the side closest to the diaphragm of its adjacent first permanent magnet. The polarity of the fourth permanent magnet on the side closest to the diaphragm is opposite to the polarity of the side closest to the diaphragm of its adjacent second permanent magnet.

9. The loudspeaker according to claim 1, characterized in that, The first sound outlet is located on the side of the first sub-cavity along the first direction, and the second sound outlet is located on the side of the second sub-cavity along the first direction.

10. A wearable device, characterized in that, Includes the loudspeaker as described in any one of claims 1-9.

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