A loudspeaker module and earphone

Abstract

The application relates to the field of audio technology and discloses a loudspeaker module and earphones, wherein a magnetic circuit assembly of the loudspeaker module comprises a first main magnet, a second main magnet and an intermediate piece arranged between the first main magnet and the second main magnet, the intermediate piece is a dust core or a center magnet, one side of the first main magnet and the second main magnet close to each other is provided with a first magnetic pole, and the first magnetic pole of the center magnet is arranged towards the voice coil. Through the specific arrangement mode of the magnetic circuit assembly, the electromagnetic efficiency of the magnetic circuit assembly in the loudspeaker module is obviously improved, and the sensitivity of the earphone core unit is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of audio technology, in particular to a loudspeaker module and earphone. BACKGROUND

[0002] Recently, several TWS (True Wireless Stereo) earphones described as "micro-plate" high-frequency earphone units have been released on the market, such as OPPO Enco X2 and Huawei FreeBuds Pro2. The "micro-plate" high-frequency earphone unit claims to widen the overall high-frequency bandwidth of the TWS earphone, enrich the high-frequency sound details, and improve the high-frequency transient response.

[0003] The applicant found that the sensitivity of existing TWS earphone products is not ideal due to the limitations of their structural design, and there are generally "arches" on the diaphragm. These "arches" are used to adjust the elastic parameters of the vibration system composed of the diaphragm and the voice coil, ultimately affecting the resonant frequency of the vibration system. In the field, the arch is generally made by heat pressing the flat membrane. This structure has very high requirements for the engineering parameters of heat pressing. Affected by temperature, the size of the product arch inevitably changes to some extent during the production process. This slight change in the arch will greatly affect the change in the resonant frequency of the elastic system, so that the performance consistency of such products cannot be well controlled.

[0004] Therefore, how to effectively improve the sensitivity of the earphone unit and improve the performance consistency of the product is a technical problem that needs to be solved in the prior art. SUMMARY

[0005] The purpose of the present application is to provide a loudspeaker module and earphone to solve or at least partially solve the technical problems mentioned in the background.

[0006] To achieve this purpose, the present application adopts the following technical solutions:

[0007] In a first aspect, the present application provides a loudspeaker module, comprising a module housing with an installation cavity, a magnetic circuit assembly, a voice coil capable of generating vibration under the action of the magnetic field of the magnetic circuit assembly, and a diaphragm driven by the voice coil, the magnetic circuit assembly comprising a first main magnet, a second main magnet, and an intermediate piece arranged between the first main magnet and the second main magnet; the intermediate piece is a dust core or a center magnet;

[0008] The side of the first main magnet and the second main magnet close to each other is provided with a first magnetic pole, and the first magnetic pole of the center magnet is arranged towards the voice coil;

[0009] Wherein, the first magnetic pole is S pole or N pole.

[0010] Optionally, the magnetic circuit assembly further comprises an upper magnet, and the voice coil is located between the upper magnet and the intermediate piece.

[0011] A first magnetic pole of the upper magnet is arranged towards the intermediate piece.

[0012] Optionally, a first extension magnet is further arranged in the mounting cavity on a side of the first main magnet away from the intermediate piece, and a second extension magnet is further arranged in the mounting cavity on a side of the second main magnet away from the intermediate piece.

[0013] The side of the first extension magnet and the second extension magnet away from the voice coil is set as a first magnetic pole.

[0014] Optionally, the magnetization direction of the first main magnet and the second main magnet is a preset first direction.

[0015] The magnetization direction of the upper magnet and the center magnet is a preset second direction, and the second direction is perpendicular to the first direction.

[0016] Optionally, the magnetization direction of the first extension magnet, the second extension magnet and the upper magnet is consistent.

[0017] Optionally, the region with the maximum magnetic field strength of the magnetic field in the first direction of the magnetic circuit assembly is at the voice coil.

[0018] Optionally, the diaphragm comprises a suspension arm and an elastic membrane which are arranged in layers and fixed.

[0019] The suspension arm comprises a center plane and a frame arranged around the center plane, and the frame and the center plane are connected by a plurality of short arms; a hollow hole is formed between each two adjacent short arms.

[0020] The rigidity of the suspension arm is greater than the rigidity of the elastic membrane.

[0021] Optionally, the voice coil is arranged between the diaphragm and the intermediate piece, and the diaphragm is attached to a ring surface of the voice coil away from the intermediate piece; the elastic membrane is attached to and fixedly bonded to the center plane and the frame.

[0022] The central part of the elastic membrane or the center plane is attached to a ring surface of the voice coil away from the intermediate piece.

[0023] Optionally, the module shell comprises a front cover and a rear cover, and the front cover and the rear cover are fixedly connected and surround the mounting cavity.

[0024] A semi-enclosed structure is formed on one side of the front cover, and a sound hole wall panel is formed on one side of the rear cover corresponding to the position of the semi-enclosed structure. The semi-enclosed structure and the sound hole wall panel are arranged to form the sound outlet of the speaker module.

[0025] The surface of the module housing is also provided with several leakage holes that connect to the mounting cavity, and the leakage holes are covered with a mesh fabric.

[0026] Secondly, the present invention provides an earphone, including an earphone shell, wherein a speaker module as described above is disposed within the earphone shell.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] By employing a specific arrangement of the magnetic circuit components, the electromagnetic efficiency of the magnetic circuit components within the speaker module is significantly improved, while simultaneously enhancing the sensitivity of the headphone core unit. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A cross-sectional schematic diagram of one preferred embodiment of the speaker module provided in this invention;

[0031] Figure 2 A cross-sectional schematic diagram of another preferred embodiment of the speaker module provided in this invention;

[0032] Figure 3 for Figure 2 Exploded view of the loudspeaker module;

[0033] Figure 4 for Figure 2 Internal magnetic field distribution diagram of the loudspeaker module;

[0034] Figure 5 In order to be in Figure 2 The magnetic field distribution diagram after adding a magnet inside the speaker module;

[0035] Figure 6 A schematic diagram of the internal structure of another speaker module provided in an embodiment of the present invention;

[0036] Figure 7 This is a schematic diagram of the cantilever structure provided in an embodiment of the present invention;

[0037] Figure 8 An appearance schematic diagram of a loudspeaker module provided by an embodiment of the present application is shown in FIG. 1.

[0038] Figure 9 A structure exploded view of a shell of a loudspeaker module provided by an embodiment of the present application is shown in FIG. 2.

[0039] Figure 10 A frequency response diagram of a loudspeaker module of the present application in a free field + baffle environment is shown in FIG. 3. Figure 2

[0040] A frequency response diagram of a loudspeaker module of the present application in a coupler-711 test environment is shown in FIG. 4. Figure 11 Figure 2 In the drawings:

[0041] FIG. 1 is a perspective view of a loudspeaker module according to an embodiment of the present application;

[0042] 11, front cover; 111, semi-enclosed structure; 12, rear cover; 121, sound hole wall plate; 21, dust shield; 22, first main magnet; 23, second main magnet; 24, center magnet; 25, first extension magnet; 26, second extension magnet; 27, upper magnet; 30, voice coil; 40, diaphragm; 41, elastic membrane; 42, suspension arm; 421, frame; 422, center plane; 423, short arm; 424, hollow hole. DETAILED DESCRIPTION

[0043] In order to make the inventive purposes, features, and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings of the embodiments of the present application. Obviously, the embodiments described below are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0044] Embodiment One

[0045] The present embodiment provides a loudspeaker module, please refer to FIG. 1, Figure 1 The loudspeaker module includes a module shell with an installation cavity, a magnetic circuit assembly, a voice coil 30 capable of generating vibration under the magnetic field of the magnetic circuit assembly, and a diaphragm 40 driven by the voice coil 30 are arranged in the installation cavity, the magnetic circuit assembly includes a first main magnet 22, a second main magnet 23, and a dust shield 21 arranged between the first main magnet 22 and the second main magnet 23;

[0046] The side of the first main magnet 22 and the second main magnet 23 close to each other is provided with a first magnetic pole; wherein the first magnetic pole is S pole or N pole. For ease of understanding, the first magnetic pole is S pole in the present embodiment, which is described and exemplified. ​

[0047] Specifically, by adopting the above structural design, a first direction ( ) can be formed near the voice coil 30. Figure 1 The distribution of static magnetic field (in the horizontal direction) in the washer 21 can enhance the magnetic field strength at the voice coil 30 position to a certain extent.

[0048] Further, please refer to Figure 2 and Figure 3 The washer 21 in the above structural design is replaced by a central magnet 24, that is, a second direction is set between the two main magnets. Figure 2 The central magnet 24, which is magnetized in the vertical direction, replaces the washer 21 to form a Hellshell array; wherein the first magnetic pole of the central magnet 24 is set towards the voice coil 30.

[0049] like Figure 4 As shown, using Figure 2 The structural design can further enhance the magnetic field strength at the voice coil 30 position. The enhanced magnetic field strength at the voice coil 30 position can effectively improve the electromagnetic efficiency and sensitivity of the speaker module.

[0050] For ease of description, the intermediate component will be used in place of the optional washer 21 and center magnet 24; furthermore, the magnetic circuit assembly also includes an upper magnet 27, please refer to... Figure 5 The voice coil 30 is located between the upper magnet 27 and the intermediate component;

[0051] The first magnetic pole of the upper magnet 27 is positioned facing the middle component.

[0052] The magnetization direction of the first main magnet 22 and the second main magnet 23 is the first direction;

[0053] Preferably, when the intermediate component uses a central magnet 24, the magnetization direction of the upper magnet 27 and the central magnet 24 is a second direction, which is perpendicular to the first direction.

[0054] Please see Table 1 below:

[0055] Table 1

[0056] Technical solution BL (Wb / m) Feature comparison Scheme 1 The structure design of Halbach array magnetization mode is used in example 1 0.166 3pcs magnets are needed, the performance is obviously improved, the middle part is smaller, and the occupied volume is small Scheme 2 On the basis of optimizing scheme 1, an upper magnet is added 0.196 4psc magnets are needed, and the frequency response is obviously improved

[0057] According to the BL values ​​in Table 1, the structural design using the Hellbeck array magnetization method in Example 1 can effectively improve the driving BL value of the voice coil 30 and the sensitivity value of the device.

[0058] Furthermore, please refer to Figure 6 A first extended magnet 25 is also provided in the mounting cavity on the side of the first main magnet 22 away from the intermediate part, and a second extended magnet 26 is also provided in the mounting cavity on the side of the second main magnet 23 away from the intermediate part.

[0059] The side of the first extension magnet 25 and the second extension magnet 26 away from the voice coil 30 is provided with a first magnetic pole.

[0060] The first extension magnet 25, the second extension magnet 26 and the upper magnet 27 are magnetized in the same direction.

[0061] Specifically, the region with the maximum magnetic field strength of the magnetic field in the first direction of the magnetic circuit assembly is at the voice coil 30.

[0062] More specifically, to further reduce the volume occupied by the magnets, the first main magnet 22 and the second main magnet 23 are respectively attached to and fixed with the intermediate piece on the opposite sides in the first direction.

[0063] More specifically, the first extension magnet 25 is attached to and fixed with the first main magnet 22, and the second extension magnet 26 is attached to and fixed with the second main magnet 23.

[0064] The above-mentioned magnets are attached in the manner of being attached, which is beneficial to reducing the space requirement of the magnets in the installation cavity.

[0065] Embodiment Two:

[0066] The embodiment provides a loudspeaker module, which is further optimized in structure of the diaphragm 40 on the basis of the improvement of the magnetic circuit structure in the installation cavity in Embodiment One, and specific reference can be made to Figure 3 and Figure 7 .

[0067] The diaphragm 40 comprises a cantilever 42 and an elastic film 41 which are stacked and fixed;

[0068] The cantilever 42 comprises a center plane 422 and a frame 421 which is arranged around the center plane 422, and the frame 421 and the center plane 422 are connected through a plurality of short arms 423; a hollow hole 424 is formed between each two adjacent short arms 423.

[0069] The cantilever 42 is elastic, and the rigidity of the cantilever 42 is greater than the rigidity of the elastic film 41.

[0070] Specifically, the voice coil 30 is arranged between the diaphragm 40 and the intermediate piece, and the diaphragm 40 is attached to the annular surface of the voice coil 30 away from the intermediate piece; the elastic film 41 is attached to and fixed with the center plane 422 and the frame 421.

[0071] The center of the elastic film 41 or the center plane 422 is attached to the annular surface of the voice coil 30 away from the intermediate piece.

[0072] The cantilever 42 and the elastic modulus 42 are stacked together to form a diaphragm 40, which divides the internal space of the mounting cavity into front and rear cavities. Two corners are formed between the two ends of the short arm 423, and the corners are preferably set to 90 degrees. A number of short arms 423 are arranged in a circle to form an array; the stiffness of the cantilever 42 can be adjusted by adjusting the number and shape of the short arms 423.

[0073] Specifically, the cantilever 42 can be made of materials such as PI, or a flexible FPC circuit board for easy connection with the voice coil 30, and the elastic diaphragm 41 can be made of materials such as polyurethane, TPU (Thermoplastic Urethane), or Silicon.

[0074] In this embodiment, the diaphragm 40 adopts a cantilever 42 + elastic membrane 41 design, eliminating the need for an "arch" and reducing the impact of an "arch" on the elastic vibration system. In this solution, the cantilever 42 plays the main elastic role; the elastic membrane 41 promotes the radiation of sound waves from the air near the diaphragm 40, contributing less to the overall elasticity of the vibration system. The advantage of this solution is that the consistency of the thickness and structure of the cantilever 42 during processing is higher than the consistency of the shape after hot pressing the diaphragm, which helps to control the consistency of product performance in mass production.

[0075] For more details, please refer to Figure 8 and Figure 9 The module housing includes a front cover 11 and a rear cover 12, which are fixedly connected and enclose to form an installation cavity;

[0076] A semi-enclosed structure 111 is formed on one side of the front cover 11, and a sound hole wall panel 121 is formed on one side of the rear cover 12 corresponding to the position of the semi-enclosed structure 111. The semi-enclosed structure 111 and the sound hole wall panel 121 are arranged to form the sound outlet of the speaker module.

[0077] The module housing also has several leakage holes connecting to the mounting cavity, and these leakage holes are covered with a mesh fabric. The frequency response can be adjusted by changing the size and arrangement of the leakage holes and the acoustic impedance of the mesh fabric.

[0078] Example 3:

[0079] This embodiment provides an earphone, including an earphone shell, and a speaker module as shown in Embodiment 1 or 2 is disposed inside the earphone shell.

[0080] More specifically, based on the structural design of Scheme 2 as in Embodiment 1, the frequency response of this embodiment in a free field + baffle environment is as follows: Figure 10 As shown, the frequency response under the Coupler-711 test environment is as follows: Figure 11It can be seen from the frequency response graph that the earphone provided in the embodiment obviously improves the high frequency response performance.

[0081] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit the present application; although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalent features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A speaker module comprising a module housing in which a mounting cavity is built, in which mounting cavity a magnetic circuit assembly, a voice coil (30) which is capable of generating vibrations under the influence of a magnetic field of the magnetic circuit assembly, and a diaphragm (40) which is driven by the voice coil (30) are arranged, characterized in that The magnetic circuit assembly comprises a first main magnet (22), a second main magnet (23), and an intermediate piece arranged between the first main magnet (22) and the second main magnet (23); the intermediate piece is a dust core (21) or a center magnet (24); The first main magnet (22) and the second main magnet (23) are provided with first magnetic poles on the side close to each other, and the first magnetic pole of the center magnet (24) is arranged towards the voice coil (30); The first magnetic pole is an S pole or an N pole. The vibrating diaphragm (40) comprises a cantilever (42) and an elastic membrane (41) which are arranged in layers and fixed. The cantilever (42) is a flexible printed circuit board (FPC) to be electrically connected with the voice coil (30). The cantilever (42) comprises a center plane (422) and a frame (421) arranged around the center plane (422), and the frame (421) and the center plane (422) are connected by a plurality of short arms (423); a hollow hole (424) is formed between each two adjacent short arms (423). The rigidity of the cantilever (42) is greater than the rigidity of the elastic membrane (41). The module shell comprises a front cover (11) and a rear cover (12), and the front cover (11) and the rear cover (12) are fixedly connected and surround the mounting cavity. One side of the front cover (11) is formed with a semi-enclosing structure (111), and one side of the rear cover (12) is formed with a sound hole wall plate (121) corresponding to the position of the semi-enclosing structure (111), and the semi-enclosing structure (111) and the sound hole wall plate (121) surround the sound hole of the loudspeaker module. The surface of the module shell is also provided with a plurality of leakage holes communicating with the mounting cavity, and a gauze cloth is mounted on the leakage holes.

2. The speaker module of claim 1, wherein, The magnetic circuit assembly further comprises an upper magnet (27), and the voice coil (30) is located between the upper magnet (27) and the intermediate piece. The first magnetic pole of the upper magnet (27) is arranged towards the intermediate piece.

3. The speaker module of claim 2, wherein, A first extension magnet (25) is arranged on the side of the first main magnet (22) away from the intermediate piece in the mounting cavity, and a second extension magnet (26) is arranged on the side of the second main magnet (23) away from the intermediate piece in the mounting cavity. The side of the first extension magnet (25) and the second extension magnet (26) away from the voice coil (30) is provided with a first magnetic pole.

4. The speaker module of claim 2, wherein, The magnetization direction of the first main magnet (22) and the second main magnet (23) is a first direction. The magnetization direction of the upper magnet (27) and the center magnet (24) is a second direction perpendicular to the first direction.

5. The speaker module of claim 3, wherein, The magnetization directions of the first extension magnet (25), the second extension magnet (26), and the upper magnet (27) are consistent.

6. The speaker module of claim 4, wherein, The area with the maximum magnetic field strength of the magnetic field in the first direction of the magnetic circuit assembly is the voice coil (30).

7. The speaker module of claim 1, wherein, The voice coil (30) is arranged between the diaphragm (40) and the middle piece, and the diaphragm (40) is attached to a ring surface of the voice coil (30) away from the middle piece; the elastic film (41) is attached and fixed to the center plane (422) and the frame (421). The center of the elastic film (41) or the center plane (422) is attached to a ring surface of the voice coil (30) away from the middle piece.

8. An earphone comprising an earphone housing, characterized in that The earphone shell is provided with the loudspeaker module as claimed in any one of claims 1-7.

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