WO2022252666A1

WO2022252666A1 - Inner core, loudspeaker module, and electronic device

Info

Publication number: WO2022252666A1
Application number: PCT/CN2022/074839
Authority: WO
Inventors: 李运海; 伍迪; 王良; 张�成
Original assignee: 北京荣耀终端有限公司
Priority date: 2021-06-02
Filing date: 2022-01-28
Publication date: 2022-12-08
Also published as: CN114501245B; CN114501245A

Abstract

The present application relates to the technical field of electronic devices, and provides an inner core, a loudspeaker module, and an electronic device, which can improve low-frequency loudness and reduce the murmur at the same time. The inner core comprises a first diaphragm group, a second diaphragm group, a first voice coil, a second voice coil, and a magnetic circuit system. The first diaphragm group, the second diaphragm group, the first voice coil and the second voice coil are provided by using a same center line; the first voice coil, the second voice coil, and the magnetic circuit system are located between the first diaphragm group and the second diaphragm group; the first voice coil is fixed on the first diaphragm group, and the second voice coil is fixed on the second diaphragm group. The magnetic circuit system comprises a first central magnet, a second central magnet, and edge magnets. The direction of the second central magnet from the S pole to the N pole is consistent with the direction of the first central magnet from the S pole to the N pole, and the direction of each edge magnet from the S pole to the N pole is opposite to the direction of the first central magnet from the S pole to the N pole. The loudspeaker module provided in embodiments of the present application is applied to the electronic device.

Description

A core, speaker module and electronic device

This application claims the priority of the Chinese patent application with the application number 202110615973.6 and the title of the invention "a core, speaker module and electronic equipment" submitted to the State Intellectual Property Office on June 2, 2021, the entire contents of which are incorporated by reference in this application.

technical field

The present application relates to the technical field of electronic equipment, in particular to a core, a loudspeaker module and electronic equipment.

Background technique

With the development of electronic equipment technology, people have higher and higher requirements for external sound effects of electronic equipment, such as notebook computers. In order to improve the low-frequency frequency response of the notebook computer, the amplitude design of the micro-speaker of the notebook computer is getting larger and larger. Under the application of large amplitude, the vibration of the voice coil and diaphragm of the micro-speaker will excite the keyboard to vibrate, which will generate noise and affect the sound quality of the loudspeaker. At present, the vibration of the keyboard is reduced by reducing the amplitude of the voice coil of the speaker, but at the same time, the loudness of the low frequency is reduced, and the sound effect is sacrificed.

Contents of the invention

Embodiments of the present application provide a core, a loudspeaker module and an electronic device, which can improve low-frequency loudness and reduce noise at the same time.

In order to achieve the above object, the embodiments of the present application adopt the following technical solutions:

In a first aspect, some embodiments of the present application provide an inner core, which includes a first diaphragm group, a second diaphragm group, a first voice coil, a second voice coil and a magnetic circuit system.

The first diaphragm group, the second diaphragm group, the first voice coil, and the second voice coil are set on the same center line, and the first voice coil, the second voice coil and the magnetic circuit system are located between the first diaphragm group and the second diaphragm Between the groups, the first voice coil is fixed on the first diaphragm group, and the second voice coil is fixed on the second diaphragm group.

The magnetic circuit system includes a first center magnet, a second center magnet and side magnets. The first center magnet and the second center magnet are arranged along the extension direction of the center line, the direction from the S pole to the N pole of the first center magnet is parallel to the extension direction of the center line, and the direction from the S pole to the N pole of the second center magnet is parallel to the extension direction of the center line. The direction from the S pole to the N pole of the first central magnet is consistent. The side magnets are arranged around the circumference of the first center magnet and the second center magnet, and the direction from the S pole to the N pole of the side magnet is opposite to the direction from the S pole to the N pole of the first center magnet.

Wherein, a first magnetic gap is formed between the first center magnet and the side magnets, and the part of the first voice coil that is far away from the first diaphragm group extends into the first magnetic gap. A second magnetic gap is formed between the first central magnet and the side magnets, and the part of the second voice coil that is far away from the second diaphragm group extends into the second magnetic gap.

In the kernel provided by this application, in the same magnetic current circuit, the magnetic current direction at the first voice coil is opposite to that at the second voice coil, and when the first voice coil and the second voice coil input current, it can drive The vibration directions of the first voice coil and the second voice coil are opposite at the same time, thereby respectively providing driving forces in opposite directions for the first diaphragm group and the second diaphragm group, so that the first diaphragm group and the second diaphragm group The membrane stack emits sound in two opposite directions simultaneously. In this way, at least part of the opposing forces can be canceled out to reduce the vibration to a certain extent, thereby reducing the impact on the vibration of the keyboard and avoiding noise.

In a possible implementation manner of the first aspect, the core further includes a supporting component. The support assembly includes a support plate, a first support frame and a second support frame. The support plate is located between the first center magnet and the second center magnet, and both the first center magnet and the second center magnet are fixed on the support plate. The first support frame is located between the first diaphragm group and the support plate, and the first diaphragm group is supported on the first support frame. The second support frame is located between the second diaphragm group and the support plate, and the second diaphragm group is supported on the second support frame. The first support frame, the support plate and the second support frame are relatively fixed, and the side magnets are fixed on the first support frame and/or the second support frame. The support assembly provided by the embodiment of the present application can fix the relative positions between the components in the magnetic circuit system, and between the components in the magnetic circuit system and the first diaphragm group and the second diaphragm group, and the support assembly is The sandwich structure composed of the support plate, the first support frame and the second support frame is beneficial to reduce the processing difficulty of the support component and at the same time reduce the difficulty of assembling the support component in the inner core.

In a possible implementation manner of the first aspect, an extension is provided on the edge of the support plate, and the extension is located between the first magnetic gap and the second magnetic gap, and the first voice coil and the second voice coil are along the central line The projections of the extension direction on the extension part are located in the extension part. In this way, the extension part can reduce the influence of airflow turbulence on the first voice coil and the second voice coil to a certain extent.

In a possible implementation manner of the first aspect, the outer edge of the extension part is attached to the inner surface of the side magnet. In this way, the extension separates the first magnetic gap from the second magnetic gap. The first magnetic gap and the second magnetic gap do not generate air flow, so there is no air flow turbulence, thereby reducing the influence of air flow on the first voice coil and the second voice coil as much as possible.

In a possible implementation manner of the first aspect, the thickness of the extension part is smaller than the thickness of the support plate. In this way, it is beneficial to increase the vibration stroke of the first voice coil in the first magnetic gap and/or increase the vibration stroke of the second voice coil in the second magnetic gap, thereby increasing the first diaphragm group and/or the second vibration stroke. The amplitude of the two-diaphragm group improves the low-frequency loudness of the speaker module.

In a possible implementation of the first aspect, the first support frame is fixedly connected to the second support frame, and the edge of the support plate is provided with a fixing part, and the fixing part is clamped between the first support frame and the second support frame. between. The fixing part is provided with a first limiting structure, and the first supporting frame and/or the second supporting frame is provided with a second limiting structure, and the first limiting structure cooperates with the second limiting structure to prevent the fixing part from supporting Move in the plane of the board. In this way, the first support frame and the second support frame are fixed, and the support plate is limited in its own thickness direction by the first support frame and the second support frame, and the first limit structure and the second limit structure are adopted at the same time The support plate is limited in its own plane, so that the relative position between the support plate and the first support frame and the second support frame can be fixed, so that the first support frame, the second support frame, and the support plate are three The latter are fixed together without complex fixing operations, so the assembly efficiency is high.

In a possible implementation manner of the first aspect, the first limiting structure may be a limiting post, a limiting hole, a limiting groove, a limiting notch, a limiting protrusion, and the like. Correspondingly, the second limiting structure may be a limiting hole, a limiting post, a limiting protrusion, a limiting post, a limiting groove, etc., which are not specifically limited here.

In a possible implementation manner of the first aspect, there are at least two fixing parts, and the at least two fixing parts are arranged around the edge of the support plate. The first limiting structure is a limiting notch arranged on an edge of the fixing part away from the support plate. The second limiting structure includes a first limiting column and a second limiting column. The first limiting column is arranged on the surface of the first support frame facing the second support frame. The second limiting column is arranged on the surface of the second support frame facing the first support frame. The first limiting column and the second limiting column are matched and accommodated in the limiting notch. In this way, in the process of aligning the first support frame, the support plate and the second support frame to assemble and form the inner core, quick alignment can be realized through the first limit structure and the second limit structure, which can further improve the assembly process. efficiency and reduce the difficulty of assembly.

In a possible implementation manner of the first aspect, the material of the support plate may be a magnetically permeable material or a non-magnetically permeable material.

In a possible implementation manner of the first aspect, the material of the support plate is stainless steel.

In a possible implementation manner of the first aspect, the magnetic circuit system further includes a first central magnetic yoke, a second central magnetic yoke, a first edge magnetic yoke, and a second edge magnetic yoke. The first central magnetic yoke is arranged on the surface of the first central magnet away from the second central magnet, and the second central magnetic yoke is arranged on the surface of the second central magnet far away from the first central magnet. The end faces of the two ends of the side magnet in the extension direction of the center line are respectively the first end face and the second end face, the first edge magnetic yoke is arranged on the first end face of the side magnet, and the second edge magnetic yoke is arranged on the second end face of the side magnet. Two ends. In this way, by constraining the magnetic field lines through the first central magnetic yoke, the second central magnetic yoke, the first edge magnetic yoke and the second edge magnetic yoke, the magnetic current intensity can be increased, and the influence on the first diaphragm group and the second diaphragm group can be improved. The drive strength of the diaphragm stack.

In a possible implementation manner of the first aspect, the first diaphragm group includes a first diaphragm sheet and a first dome. The first diaphragm includes a first ring and a first flat membrane surrounded by the first ring. The first dome is stacked on the side of the first flat film away from the first voice coil, and is fixed together with the first flat film by means of gluing or the like. The first voice coil is fixed on the first flat film by means of glue or the like.

In a possible implementation manner of the first aspect, the second diaphragm group includes a second diaphragm sheet and a second dome. The second diaphragm includes a second ring and a second flat membrane surrounded by the second ring. The second dome is stacked on the side of the second flat film away from the second voice coil, and is fixed with the second flat film by means of gluing or the like. The second voice coil is fixed on the second flat film by means of glue or the like.

In the second aspect, some embodiments of the present application provide a speaker module. The speaker module includes a casing and the core described in any of the above technical solutions. The core is arranged in the casing, and the casing is The diaphragm group and the second diaphragm group are divided into the first front cavity, the rear cavity and the second front cavity. The first voice coil, the second voice coil, the magnetic circuit system and the support assembly of the core are located in the rear cavity. There is a sound channel, and both the first front cavity and the second front cavity communicate with the sound output channel.

Since the speaker module provided by the present application includes the core described in any one of the above technical solutions, the two can solve the same technical problem and achieve the same effect.

In a possible implementation manner of the second aspect, there is one sound output channel, and both the first front cavity and the second front cavity communicate with the sound output channel.

In a possible implementation manner of the second aspect, the number of sound output channels is two, the first front cavity communicates with one sound output channel, and the second front cavity communicates with the other sound output channel.

In the third aspect, some embodiments of the present application provide an electronic device, the electronic device includes a casing, a middle board, a keyboard, and the speaker module described in the above technical solution, the middle board is arranged in the casing, and the keyboard and the speaker module are fixed on the middle plate.

Since the vibration generated by the speaker module is relatively small, when the vibration generated by the speaker module is transmitted to the keyboard through the middle plate, it is less likely to cause the keys on the keyboard to resonate, and the noise generated is less, which can ensure that the speaker module audio playback quality.

Description of drawings

FIG. 1 is a schematic structural diagram of an electronic device provided by some embodiments of the present application;

Fig. 2 is a perspective view of the keyboard host in the electronic device shown in Fig. 1;

Fig. 3 is an exploded view of the keyboard host shown in Fig. 2;

Fig. 4 is a schematic cross-sectional structure diagram of the keyboard host shown in Fig. 2 at the line A-A;

Fig. 5 is a perspective view of a speaker module in the keyboard host shown in Fig. 3;

Fig. 6 is a structural schematic view of the loudspeaker module shown in Fig. 5 viewed from bottom to top;

Fig. 7 is a three-dimensional sectional view of the loudspeaker module shown in Fig. 6 at the B-B line;

Fig. 8 is a schematic cross-sectional structure diagram of the core in the loudspeaker module shown in Fig. 7;

FIG. 9 is a schematic structural diagram of a kernel provided by some other embodiments of the present application;

Figure 10 is an exploded view of the kernel shown in Figure 9;

Fig. 11 is a schematic diagram of the cross-sectional structure of the inner core shown in Fig. 9 at the line C-C;

Fig. 12 is an exploded view of the inner magnetic circuit system shown in Fig. 10;

Figure 13 is a perspective view of the inner support assembly shown in Figure 10;

Figure 14 is an exploded view of the support assembly shown in Figure 13;

Fig. 15 is a schematic cross-sectional structure diagram of a speaker module provided by some embodiments of the present application.

Detailed ways

In this embodiment of the application, the terms "first", "second", "third", and "fourth" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance or implicitly indicating the indicated The number of technical characteristics. Thus, a feature defined as "first", "second", "third" and "fourth" may expressly or implicitly include one or more of such features.

In the embodiments of the present application, the term "comprising", "comprising" or any other variant thereof is intended to cover a non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements, but also includes Including other elements not expressly listed, or also including elements inherent in such process, method, article or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising that element.

In the embodiment of this application, "and/or" is just a kind of relationship describing the relationship between related objects, which means that there may be three kinds of relationships, for example, A and/or B, which can mean that A exists alone, and A and B exist at the same time. B, there are three situations of B alone. In addition, the character "/" in this article generally indicates that the contextual objects are an "or" relationship.

The present application provides an electronic device, which is a type of electronic device with a speaker module. Specifically, the electronic equipment includes, but is not limited to, mobile phones, tablet personal computers, laptop computers, personal digital assistants (PDAs), personal computers, notebook computers (notebooks), vehicle-mounted Electronics such as devices and wearables.

Please refer to FIG. 1 . FIG. 1 is a schematic structural diagram of an electronic device 100 provided by some embodiments of the present application. In this embodiment, the electronic device 100 is a notebook computer. Specifically, the electronic device 100 includes a display 10 and a keyboard host 20 .

The display 10 is used to display images, videos, and the like. The keyboard host 20 is rotatably connected to the display 10 . The keyboard host 20 is used to input instructions and data, and controls the display 10 to display images and videos according to the input instructions and data. Meanwhile, the keyboard host 20 is also used to play voice or music.

The electronic device 100 is switchable between an open state and a closed state. When the electronic device 100 is in an open state, the display 10 and the keyboard host 20 form an angle greater than 0° and less than 180°. When the electronic device 100 is in a closed state, the display 10 covers the keyboard main body 20 , and the display surface of the display 10 is opposite to the keyboard surface of the keyboard main body 20 .

In order to facilitate the description of the following embodiments, an XYZ coordinate system is established for the keyboard host 20 . Specifically, define the extension direction of the rotation axes of the keyboard main body 20 and the display 10 as the X-axis direction, the thickness direction of the keyboard main body 20 as the Z-axis direction, and the direction perpendicular to both the X-axis direction and the Z-axis direction as the Y-axis direction. It can be understood that the coordinate system setting of the keyboard host 20 can be flexibly set according to actual needs, and no specific limitation is made here.

Please refer to FIG. 2 . FIG. 2 is a perspective view of the main keyboard 20 in the electronic device 100 shown in FIG. 1 , and FIG. 3 is an exploded view of the main keyboard 20 shown in FIG. 2 . In this embodiment, the keyboard host 20 includes a casing 21 , a middle board 22 , a keyboard 23 and a speaker module 24 .

It should be noted that FIG. 2 and FIG. 3 only schematically show some components included in the keyboard main unit 20, and the actual shape, actual size, actual position and actual structure of these components are not affected by FIG. 2 and FIG. Figure limited.

The shell 21 is used to protect the internal structure of the keyboard host 20 . The shell 21 can be a structural whole, or can be formed by assembling a plurality of parts. In some embodiments, referring to FIG. 3 , the shell 21 includes a C shell 211 and a D shell 212 . The C shell 211 is combined with the D shell 212 to enclose the inner accommodation space of the shell 21 . The C shell 211 and the D shell 212 can be fixed by clamping, can also be fixed by glue, and can also be fixed by screw connection, which is not specifically limited here.

The middle board 22 is located in the inner accommodation space of the casing 21 . The middle plate 22 is fixed on the inner surface of the C shell 211 by means of gluing, clamping, screwing, riveting and the like. In other embodiments, the middle board 22 may also be fixed on the inner surface of the D shell 212 . The material of the middle board 22 includes but not limited to plastic and metal. The middle plate 22 is used as a supporting “skeleton” for the electronic components in the keyboard host 20 . The keyboard 23 and the speaker module 24 are directly or indirectly fixed on the middle board 22 .

The keyboard 23 is used to input instructions and data. The keyboard 23 includes a fixed board 231 and a plurality of keys 232 connected to the fixed board 231 . Please refer to FIG. 4 . FIG. 4 is a schematic cross-sectional structure diagram of the keyboard host 20 shown in FIG. 2 at line A-A. The fixing plate 231 is fixed on the middle plate 22 . The middle plate 22 is provided with a first escape opening 22a (please refer to FIG. 3 ). The position corresponding to each button 232 on the C shell 211 is provided with a second avoidance opening 21a (please refer to FIG. 3 ). The button 232 protrudes out of the C-shell 211 through the first avoidance opening 22a and the second escape opening 21a corresponding to the button 232 .

The speaker module 24 is used to convert audio electrical signals into sound signals. In some embodiments, please refer back to FIG. 3 , the number of speaker modules 24 may be two, and the two speaker modules 24 are arranged at both ends of the keyboard host 20 in the direction of the X-axis. The two speaker modules 24 have the same structure and are arranged symmetrically. In other embodiments, the number of speaker modules 24 may also be one or more than three, which is not specifically limited here. It should be noted that the position of the speaker module 24 in the keyboard main unit 20 can be flexibly set, and FIG. 3 only provides an example of a position of the speaker module 24 in the keyboard main unit 20, which cannot be regarded as constituting a limitation for this application. special restrictions.

Please refer to FIG. 5 and FIG. 6, FIG. 5 is a perspective view of a speaker module 24 in the keyboard main unit 20 shown in FIG. 3, and FIG. 6 is a structural schematic view of the speaker module 24 shown in FIG. The speaker module 24 includes a casing 241 and a core 242 .

Please refer to FIG. 7 . FIG. 7 is a three-dimensional cross-sectional view of the speaker module 24 shown in FIG. 6 at the line B-B. The casing 241 encloses the rear cavity C2 of the speaker module 24 . The housing 241 can be a structural whole, or can be formed by assembling a plurality of parts. Optionally, referring to FIGS. 5-7 , the housing 241 is formed by combining a front shell 241a and a rear shell 241b. A mounting hole 243 is defined on a wall of the housing 241 . Exemplarily, the installation hole 243 is disposed on the front shell 241a. The inner core 242 is installed in the rear cavity C2, and the inner core 242 is blocked at one end opening of the installation hole 243 which communicates with the rear cavity C2. The outer surface of the front shell 241a is attached to the inner surface of the D shell 212 in the speaker module 20 shown in FIG. 3 . The inner wall of the installation hole 243 , the inner core 242 and the D shell 212 enclose the front cavity C1 of the speaker module 24 . Referring back to FIG. 3 , the D shell 212 is provided with a sound outlet 21 b communicating the front chamber C1 with the outer space of the D shell 212 .

Please refer to FIG. 8 , which is a schematic cross-sectional structure diagram of the core 242 in the speaker module 24 shown in FIG. 7 . The core 242 includes a diaphragm 242a, a voice coil 242b fixedly connected to the diaphragm 242a, a magnetic circuit system 242c disposed on one side of the diaphragm 242a, and a frame 242d for installing the diaphragm 242a and the magnetic circuit system 242c. When the inner core 242 is applied to the speaker module 24 shown in FIG. 7, the inner core 242 is fixed on the inner wall of the front shell 241a through the frame 242d, and the diaphragm 242a is blocked in the opening of one end of the installation hole 243 that communicates with the rear cavity C2. The voice coil 242b, the magnetic circuit system 242c and the frame 242d are located in the rear cavity C2, and the diaphragm 242a, the inner wall of the mounting hole 243 and the D shell 212 in FIG. 3 enclose the front cavity C1 of the speaker module 24. The voice coil 242b generates an induced magnetic field after being energized, and is displaced by the magnetic force of the magnetic circuit system 242c to drive the diaphragm 242a to vibrate, thereby pushing the air in the front cavity C1 to vibrate to form sound waves, which are output from the sound outlet 21b .

When the inner core 242 described in the above embodiment is in operation, the magnetic circuit system 242c and the frame 242d are subjected to reverse force, which causes vibration. The vibration is transmitted to the keyboard 23 through the housing 241 in FIG. 7 and the middle plate 22 in FIG. 3 successively. Therefore, it is easy to cause the key 232 on the keyboard 23 to resonate. When the button 232 resonates, the button 232 collides with structures such as the C shell 211 and the fixing plate 231 , thereby generating noise, which affects the sound playing effect of the speaker module 24 .

In order to solve the above problem, please refer to FIG. 9 and FIG. 10 , FIG. 9 is a schematic structural diagram of the core 242 provided by some other embodiments of the present application, and FIG. 10 is an exploded view of the core 242 shown in FIG. 9 . In this embodiment, the inner core 242 includes a first diaphragm group 2421 , a second diaphragm group 2422 , a first voice coil 2423 , a second voice coil 2424 , a magnetic circuit system 2425 and a supporting component 2426 .

It should be noted that FIG. 9 and FIG. 10 only schematically show some components included in the core 242, and the actual shape, actual size, actual position and actual structure of these components are not affected by FIG. 9 and FIG. 10 and the following drawings. limited.

Referring to FIG. 10 , the first diaphragm group 2421 , the second diaphragm group 2422 , the first voice coil 2423 and the second voice coil 2424 are arranged concentrically with the central line O. The first voice coil 2423 , the second voice coil 2424 , the magnetic circuit system 2425 and the supporting component 2426 are located between the first diaphragm group 2421 and the second diaphragm group 2422 .

Specifically, please refer to FIG. 11 . FIG. 11 is a schematic cross-sectional structure diagram of the inner core shown in FIG. 9 at line C-C. The first diaphragm group 2421 includes a first diaphragm sheet 2421a and a first dome 2421b. The first diaphragm 2421a includes a first ring 2421a1 and a first flat membrane 2421a2 surrounded by the first ring 2421a1. The first dome 2421b is stacked on the side of the first flat film 2421a2 away from the first voice coil 2423, and is fixed with the first flat film 2421a2 by means of gluing or the like. The first voice coil 2423 is fixed on the first flat film 2421a2 by means of glue or the like.

Similarly, please continue to refer to FIG. 11 , the second diaphragm group 2422 includes a second diaphragm sheet 2422a and a second dome 2422b. The second diaphragm 2422a includes a second ring 2422a1 and a second flat membrane 2422a2 surrounded by the second ring 2422a1. The second dome 2422b is laminated on the side of the second flat film 2422a2 away from the second voice coil 2424, and is fixed with the second flat film 2422a2 by means of glue or the like. The second voice coil 2424 is fixed on the second flat film 2422a2 by means of glue or the like.

The magnetic circuit system 2425 is used to generate a magnetic field. Under the action of the magnetic field, the vibration directions of the first voice coil 2423 and the second voice coil 2424 can be opposite at the same time, thus the first diaphragm group 2421 and the second diaphragm group 2421 and the second The diaphragm group 2422 provides driving force in opposite directions, so that the first diaphragm group 2421 and the second diaphragm group 2422 emit sound in two opposite directions at the same time.

Specifically, please refer to FIG. 11 and FIG. 12 . FIG. 12 is an exploded view of the magnetic circuit system 2425 inside the inner core 242 shown in FIG. 10 . The magnetic circuit system 2425 includes a first center magnet 2425a, a second center magnet 2425b, and a side magnet 2425c.

The first central magnet 2425a and the second central magnet 2425b are arranged along the extension direction of the central line O. The direction from the S pole to the N pole of the first central magnet 2425a is parallel to the extending direction of the central line O. The direction from the S pole to the N pole of the second center magnet 2425b is consistent with the direction from the S pole to the N pole of the first center magnet 2425a.

The side magnets 2425c are arranged around the circumference of the first center magnet 2425a and the second center magnet 2425b. The number of side magnets 2425c can be one or more. When there are multiple side magnets 2425c, the multiple side magnets 2425c are uniformly arranged around the circumference of the first center magnet 2425a and the second center magnet 2425b. In the embodiment shown in FIG. 12, the number of side magnets 2425c is four.

The direction from the S pole to the N pole of the side magnet 2425c is opposite to that of the first center magnet 2425a from the S pole to the N pole. In this way, the first central magnet 2425a, the second central magnet 2425b and the side magnets 2425c form a magnetic current circuit as shown in FIG. 11 .

A first magnetic gap K1 is formed between the first center magnet 2425a and the side magnet 2425c. The part of the first voice coil 2423 away from the first diaphragm group 2421 extends into the first magnetic gap K1.

A second magnetic gap K2 is formed between the first center magnet 2425a and the side magnet 2425c. A part of the second voice coil 2424 away from the second diaphragm group 2422 extends into the second magnetic gap K2.

In the same magnetic current circuit, the magnetic current direction at the first voice coil 2423 is opposite to that at the second voice coil 2424, when the first voice coil 2423 and the second voice coil 2424 input current, the first voice coil 2423 can be driven The voice coil 2423 and the second voice coil 2424 vibrate in opposite directions at the same time, thereby providing driving forces in opposite directions to the first diaphragm group 2421 and the second diaphragm group 2422 respectively, so that the first diaphragm group 2421 and the second diaphragm group 2422 The second diaphragm group 2422 emits sound in two opposite directions at the same time. In this way, at least part of the opposing forces can be canceled out to reduce the vibration to a certain extent, thereby reducing the impact on the vibration of the keyboard and avoiding noise.

On the basis of the above-mentioned embodiments, in order to increase the magnetic current intensity, in some embodiments, please continue to refer to Figure 11 and Figure 12, the magnetic circuit system 2425 also includes a first central magnetically permeable yoke 2425d, a second central magnetically permeable yoke 2425e, the first edge magnetic yoke 2425f and the second edge magnetic yoke 2425g.

The first central magnetic yoke 2425d , the second central magnetic yoke 2425e , the first edge magnetic yoke 2425f and the second edge magnetic yoke 2425g are used to restrict the outward diffusion of the magnetic flux leakage of the induction coil. Its material can be a yoke made of stacked silicon steel sheets.

The first central magnetic yoke 2425d is arranged on the surface of the first central magnet 2425a away from the second central magnet 2425b by means of gluing, clamping, or threaded connection, and the second central magnetic yoke 2425e is connected by gluing, clamping, or screwing. They are arranged on the surface of the second center magnet 2425b away from the first center magnet 2425a in the same manner. The end surfaces at both ends of the side magnet 2425c in the extending direction of the central line O are respectively a first end surface and a second end surface. The first edge magnetic yoke 2425f is disposed on the first end surface of the edge magnet 2425c by means of gluing, clamping, screwing and the like. The second edge magnetic yoke 2425g is disposed on the second end surface of the edge magnet 2425c by means of gluing, clamping, threading and the like.

In this way, the magnetic field lines can be restrained by the first central magnetic yoke 2425d, the second central magnetic yoke 2425e, the first edge magnetic yoke 2425f and the second edge magnetic yoke 2425g, which can increase the magnetic current intensity and improve the impact on the first diaphragm. Drive strength of group 2421 and second diaphragm group 2422.

It can be understood that, in some other embodiments, the magnetic circuit system 2425 may not include the first central magnetic yoke 2425d, the second central magnetic yoke 2425e, the first edge magnetic yoke 2425f and the second edge magnetic yoke 2425g.

The support assembly 2426 is used to fix the relative position of each component in the magnetic circuit system 2425, and is also used to fix the relationship between each component in the magnetic circuit system 2425 and the first diaphragm group 2421 and the second diaphragm group 2422. relative position. There are many structural forms of the support assembly 2426 that meet this condition. In some embodiments, please refer to FIGS. 10-12 , the support assembly 2426 includes a support plate 2426a, a first support frame 2426b and a second support frame 2426c.

The supporting plate 2426a is located between the first central magnet 2425a and the second central magnet 2425b, and the first central magnet 2425a and the second central magnet 2425b are fixed on the supporting plate 2426a by means of gluing, clamping, screwing and the like. In this embodiment, the support plate 2426a is mainly used to support the first center magnet 2425a and the second center magnet 2425b, and the material of the support plate 2426a can be a magnetically conductive material or a non-magnetically conductive material. Be specific. Since the structural strength of the support plate 2426a directly determines the support effect, in order to ensure the structural strength of the support plate 2426a, the thickness of the support plate 2426a can be increased, but this will increase the thickness of the inner core 242 and the speaker module 24. In order to avoid this problem, the support plate 2426a can be made of a more rigid material (such as stainless steel) to take into account both structural strength and thickness.

When the first diaphragm group 2421 and the second diaphragm group 2422 vibrate, if the airflow in the first magnetic gap K1 and the second magnetic gap K2 fluctuates, it will easily cause airflow disturbance, resulting in the first voice coil 2423 and the second The voice coil 2424 oscillates in the first magnetic gap K1 and the second magnetic gap K2 respectively, thereby causing abnormal impact noise, impact damage or jamming. In order to avoid this problem, please refer to FIG. 11 , the edge of the support plate 2426a is provided with an extension 2426a0. The extension part 2426a0 is located between the first magnetic gap K1 and the second magnetic gap K2, and the projections of the first voice coil 2423 and the second voice coil 2424 along the extension direction of the central line O on the extension part 2426a0 are located at the extension part 2426a0 Inside. In this way, the extension part 2426a0 can reduce the influence of airflow turbulence on the first voice coil 2423 and the second voice coil 2424 to a certain extent.

Based on the above embodiment, optionally, the outer edge of the extension part 2426a0 is attached to the inner surface of the side magnet 2425c. In this way, the extension portion 2426a0 separates the first magnetic gap K1 from the second magnetic gap K2. The first magnetic gap K1 and the second magnetic gap K2 will not generate air flow, so there will be no air flow turbulence, thereby reducing the influence of air flow on the first voice coil 2423 and the second voice coil 2424 as much as possible.

In some embodiments, please refer to FIG. 11 , the thickness d1 of the extension part 2426a0 is smaller than the thickness d2 of the support plate 2426a. In this way, it is beneficial to increase the vibration stroke of the first voice coil 2423 in the first magnetic gap K1 and/or increase the vibration stroke of the second voice coil 2424 in the second magnetic gap K2, thereby increasing the first diaphragm group 2421 and/or the amplitude of the second diaphragm group 2422 to improve the low-frequency loudness of the speaker module 24.

The first support frame 2426b is located between the first diaphragm group 2421 and the support plate 2426a. The first diaphragm group 2421 is supported on the first supporting frame 2426b. Specifically, one circumference of the edge of the first diaphragm group 2421 can be fixed to one circumference of the first support frame 2426b by means of gluing, clamping, screw connection, etc., so as to support the first diaphragm group 2421 .

The second support frame 2426c is located between the second diaphragm group 2422 and the support plate 2426a. The second diaphragm group 2422 is supported on the second supporting frame 2426c. Specifically, one round of the edge of the second diaphragm group 2422 may be fixed to one round of the second support frame 2426c by means of gluing, clamping, screwing, etc., so as to support the second diaphragm group 2422 .

The first support frame 2426b, the support plate 2426a, and the second support frame 2426c are relatively fixed.

In some embodiments, the first support frame 2426b, the support plate 2426a, and the second support frame 2426c can be fixed two by two in sequence. That is to say, the first support frame 2426b is fixed to the support plate 2426a, and the support plate 2426a is also fixed to the second support frame 2426c.

In some other embodiments, please refer to FIG. 13 and FIG. 14 , FIG. 13 is a perspective view of the support assembly 2426 in the inner core 24 shown in FIG. 10 , and FIG. 14 is an exploded view of the support assembly 2426 shown in FIG. 13 . The first support frame 2426b is fixedly connected with the second support frame 2426c. On this basis, the edge of the support plate 2426a is provided with a fixing portion 2426a1. The fixing part 2426a1 is clamped between the first support frame 2426b and the second support frame 2426c. The fixing part 2426a1 is provided with a first limiting structure, and the first supporting frame 2426b and/or the second supporting frame 2426c is provided with a second limiting structure. The first limiting structure cooperates with the second limiting structure to prevent the fixing part 2426a1 from moving in the plane where the support plate 2426a is located.

In this way, the first support frame 2426b and the second support frame 2426c are fixed, and the support plate 2426a is limited in the Z-axis direction by the first support frame 2426b and the second support frame 2426c. The second position limiting structure limits the support plate 2426a in the XY plane, thereby fixing the relative position between the support plate 2426a, the first support frame 2426b, and the second support frame 2426c, so that the first support frame 2426b, The second support frame 2426c and the support plate 2426a are fixed together without complicated fixing operations, so the assembly efficiency is high.

In the above embodiments, the first limiting structure may be a limiting column, a limiting hole, a limiting groove, a limiting notch, a limiting protrusion and the like. Correspondingly, the second limiting structure may be a limiting hole, a limiting post, a limiting protrusion, a limiting post, a limiting groove, etc., which are not specifically limited here.

In some embodiments, please refer to FIG. 14 , there are at least two fixing parts 2426a1 , and at least two fixing parts 2426a1 are arranged around the edge of the support plate 2426a. In some embodiments, please refer to FIG. 14 , the number of fixing parts 2426a1 is four, and the four fixing parts 2426a1 are respectively disposed at four corners of the edge of the support plate 2426a. The first limiting structure is a limiting notch 2426a2 disposed on an edge of the fixing portion 2426a1 away from the support plate 2426a. The second limiting structure includes a first limiting column 2426b1 and a second limiting column 2426c1. The first limiting post 2426b1 is disposed on the surface of the first support frame 2426b facing the second support frame 2426c. The second limiting post 2426c1 is disposed on the surface of the second support frame 2426c facing the first support frame 2426b. The first limiting column 2426b1 and the second limiting column 2426c1 are fitly accommodated in the limiting notch 2426a2. In this way, in the process of aligning the first support frame 2426b, the support plate 2426a and the second support frame 2426c to assemble and form the inner core 242, quick alignment can be realized through the first limiting structure and the second limiting structure, thereby The assembly efficiency can be further improved and the assembly difficulty can be reduced.

On the basis of the above embodiments, optionally, the first support frame 2426b and the second support frame 2426c may be fixed by the first limit post 2426b1 and the second limit post 2426c1. Specifically, the fixing methods of the first limiting post 2426b1 and the second limiting post 2426c1 include, but are not limited to, gluing, clamping and threaded connection. In other embodiments, the first support frame 2426b and the second support frame 2426c may also be fixedly connected through other structures, which are not specifically limited here.

The side magnet 2425c is fixed on the first support frame 2426b and/or the second support frame 2426c. That is to say, the side magnet 2425c can be fixed on the first support frame 2426b, also can be fixed on the second support frame 2426c, can also be fixed on the first support frame 2426b and the second support frame 2426c at the same time. Be specific. In some embodiments, please refer to FIG. 11 , the side magnet 2425c is fixed on the first edge magnetic yoke 2425f and the second edge magnetic yoke 2425g by gluing or the like, and the first edge magnetic yoke 2425f and the second edge magnetic yoke The yoke 2425g is respectively formed on the first support frame 2426b and the second support frame 2426c through an in-mold decoration (IMD) process. Thus, the side magnet 2425c is fixed on the first support frame 2426b and the second support frame 2426c through the first edge magnetic yoke 2425f and the second edge magnetic yoke 2425g.

Referring to FIG. 14 , the surface of the first support frame 2426b facing the second support frame 2426c is provided with a first installation notch 2426b2 , and the surface of the second support frame 2426c facing the first support frame 2426b is provided with a second installation notch 2426c2 . The first installation notch 2426b2 is matched with the second installation notch 2426c2 to form the installation opening K3 in FIG. 13 , and the installation opening K3 is used to accommodate the side magnet 2425c.

The support assembly 2426 provided in the embodiment of the present application can fix the relative positions between the components in the magnetic circuit system 2425 and between the components in the magnetic circuit system 2425 and the first diaphragm group 2421 and the second diaphragm group 2422, And the support assembly 2426 is a sandwich structure composed of the support plate 2426a, the first support frame 2426b, and the second support frame 2426c, so it is beneficial to reduce the processing difficulty of the support assembly 2426, and at the same time reduce the assembly of the support assembly 2426 in the inner core 242 difficulty.

Please refer to FIG. 15 . FIG. 15 is a schematic cross-sectional structure diagram of the speaker module 24 provided by some embodiments of the present application. The speaker module includes a casing 241 and a core 242 shown in FIGS. 9-11 . The shell 241 can be independent from the C shell 211 and the D shell 212 in FIG. , not specifically limited here.

The inner core 242 is disposed in the casing 241 . The casing 241 is divided into a first front chamber C11 , a rear chamber C2 and a second front chamber C12 by the first diaphragm group 2421 and the second diaphragm group 2422 of the inner core 242 . The first voice coil 2423, the second voice coil 2424, the magnetic circuit system 2425 and the support assembly 2426 of the inner core 242 are located in the rear cavity C2. The housing 241 is provided with a sound channel C3. Both the first front chamber C11 and the second front chamber C12 communicate with the sound output channel C3. There can be one or two sounding channels C3. When there is one sound output channel C3, both the first front cavity C11 and the second front cavity C12 communicate with the sound output channel C3. When there are two sound-emitting channels C3, the first front chamber C11 communicates with one sound-emitting channel C3, and the second front chamber C12 communicates with the other sound-emitting channel C3. FIG. 15 only shows an example in which there are two sound channels C3, which should not be regarded as a special limitation to the present application.

Since the speaker module 24 provided by the present application includes the core 242 shown in FIGS. 9-11 , the two can solve the same technical problem and achieve the same effect.

In the description of this specification, specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in an appropriate manner.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical 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 various embodiments of the present application.

Claims

A core (242), characterized in that it includes a first diaphragm group (2421), a second diaphragm group (2422), a first voice coil (2423), a second voice coil (2424) and a magnetic circuit system ( 2425);

The first diaphragm group (2421), the second diaphragm group (2422), the first voice coil (2423), and the second voice coil (2424) are arranged concentrically with the central line (O), so The first voice coil (2423), the second voice coil (2424) and the magnetic circuit system (2425) are located between the first diaphragm group (2421) and the second diaphragm group (2422) Between, the first voice coil (2423) is fixed on the first diaphragm group (2421), and the second voice coil (2424) is fixed on the second diaphragm group (2422);

The magnetic circuit system (2425) includes a first center magnet (2425a), a second center magnet (2425b) and side magnets (2425c);

The first center magnet (2425a) and the second center magnet (2425b) are arranged along the extension direction of the center line (O), and the direction from the S pole to the N pole of the first center magnet (2425a) is the same as The extension direction of the central line (O) is parallel, and the direction from the S pole to the N pole of the second central magnet (2425b) is consistent with the direction from the S pole to the N pole of the first central magnet (2425a);

The side magnets (2425c) are arranged around the circumference of the first center magnet (2425a) and the second center magnet (2425b), and the direction from the S pole to the N pole of the side magnets (2425c) is the same as that of the The direction of the first central magnet (2425a) is opposite from the S pole to the N pole;

A first magnetic gap (K1) is formed between the first center magnet (2425a) and the side magnet (2425c), and the part of the first voice coil (2423) far away from the first diaphragm group (2421) partially protruding into said first magnetic gap (K1);

A second magnetic gap (K2) is formed between the first center magnet (2425a) and the side magnet (2425c), and the part of the second voice coil (2424) far away from the second diaphragm group (2422) partly extends into said second magnetic gap (K2).
The kernel (242) according to claim 1, further comprising a support assembly (2426);

The support assembly (2426) includes a support plate (2426a), a first support frame (2426b) and a second support frame (2426c);

The support plate (2426a) is located between the first center magnet (2425a) and the second center magnet (2425b), and both the first center magnet (2425a) and the second center magnet (2425b) fixed on the support plate (2426a);

The first support frame (2426b) is located between the first diaphragm group (2421) and the support plate (2426a), and the first diaphragm group (2421) is supported by the first support frame ( 2426b); the second support frame (2426c) is located between the second diaphragm group (2422) and the support plate (2426a), and the second diaphragm group (2422) is supported by the first On the second supporting frame (2426c);

The first support frame (2426b), the support plate (2426a), and the second support frame (2426c) are relatively fixed, and the side magnets (2425c) are fixed on the first support frame (2426b) and /or on the second support frame (2426c).
The inner core (242) according to claim 2, characterized in that, the edge of the support plate (2426a) is provided with an extension (2426a0), and the extension (2426a0) is located in the first magnetic gap (K1) Between the second magnetic gap (K2), the first voice coil (2423) and the second voice coil (2424) are in the extension part (2426a0) along the extension direction of the center line (O). ) are all located within the extension (2426a0).
The inner core (242) according to claim 3, characterized in that, the thickness of the extension part (2426a0) is smaller than the thickness of the support plate (2426a).
The inner core (242) according to any one of claims 2-4, characterized in that, the first support frame (2426b) is fixedly connected to the second support frame (2426c), and the support plate (2426a) There is a fixed part (2426a1) on the edge, and the fixed part (2426a1) is clamped between the first support frame (2426b) and the second support frame (2426c);

The fixing part (2426a1) is provided with a first limiting structure, the first supporting frame (2426b) and/or the second supporting frame (2426c) is provided with a second limiting structure, and the first The limiting structure cooperates with the second limiting structure to prevent the fixing part (2426a1) from moving in the plane where the supporting plate (2426a) is located.
The inner core (242) according to claim 5, characterized in that, the number of the fixing parts (2426a1) is at least two, and at least two of the fixing parts (2426a1) surround the edge of the support plate (2426a) set up;

The first limiting structure is a limiting notch (2426a2) provided on the edge of the fixing part (2426a1) away from the support plate (2426a), and the second limiting structure includes a first limiting column (2426b1 ) and a second limit column (2426c1), the first limit column (2426b1) is set on the surface of the first support frame (2426b) facing the second support frame (2426c), the second limit The position post (2426c1) is arranged on the surface of the second support frame (2426c) facing the first support frame (2426b), the first limit post (2426b1) and the second limit post (2426c1) Fitted and accommodated in the limiting notch (2426a2), the first supporting frame (2426b) and the second supporting frame (2426c) pass through the first limiting column (2426b1) and the second The limit post (2426c1) is fixed.
The inner core (242) according to any one of claims 2-6, characterized in that, the material of the support plate (2426a) is stainless steel.
The core (242) according to any one of claims 1-7, characterized in that the magnetic circuit system (2425) further comprises a first central magnetically permeable yoke (2425d), a second central magnetically permeable yoke (2425e) , the first edge magnetic yoke (2425f) and the second edge magnetic yoke (2425g);

The first central magnetic yoke (2425d) is arranged on the surface of the first central magnet (2425a) away from the second central magnet (2425b), and the second central magnetic yoke (2425e) is arranged on the a second center magnet (2425b) away from a surface of said first center magnet (2425a);

The two end faces of the side magnet (2425c) in the extension direction of the center line (O) are respectively the first end face and the second end face, and the first edge magnetic yoke (2425f) is arranged on the side magnet The first end surface of (2425c), the second edge magnetic yoke (2425g) is arranged on the second end surface of the side magnet (2425c).
The core (242) according to any one of claims 1-8, characterized in that, the first diaphragm group (2421) comprises a first diaphragm (2421a) and a first dome (2421b), the The first diaphragm (2421a) includes a first ring (2421a1) and a first flat membrane (2421a2) surrounded by the first ring (2421a1), and the first voice coil (2423) is fixed on the On the first flat film (2421a2), the first dome (2421b) is stacked on the side of the first flat film (2421a2) away from the first voice coil (2423), and is connected to the first A flat membrane (2421a2) is fixed.
A loudspeaker module (24), characterized in that it comprises a housing (241) and an inner core (242) according to any one of claims 1-9, the inner core (242) is arranged on the housing ( 241), and the housing (241) is divided into a first front cavity (C11), a rear cavity ( C2) and the second front cavity (C12), the first voice coil (2423), the second voice coil (2424), the magnetic circuit system (2425) and the support assembly (2426) of the inner core (242) are located in the rear In the cavity (C2), the housing is provided with a sound channel (C3), and both the first front cavity (C11) and the second front cavity (C12) communicate with the sound channel (C3) .
An electronic device (100), characterized in that it comprises a casing (21), a middle board (22), a keyboard (23) and the speaker module (24) according to claim 10, wherein the middle board (22) is set Inside the casing (21), the keyboard (23) and the speaker module (24) are both fixed on the middle board (22).