WO2024022484A1

WO2024022484A1 - Sound production apparatus and terminal device

Info

Publication number: WO2024022484A1
Application number: PCT/CN2023/109827
Authority: WO
Inventors: 孙铭君; 吴江涛; 张迪
Original assignee: 潍坊歌尔丹拿电子科技有限公司
Priority date: 2022-07-28
Filing date: 2023-07-28
Publication date: 2024-02-01
Also published as: CN115065917A

Abstract

A sound production apparatus (100) and a terminal device. The sound production apparatus (100) comprises a basket (1), a magnetic circuit system (2) and a vibration system (3), wherein the basket (1) is provided with an accommodating cavity (11), and the magnetic circuit system (2) comprises a U-yoke (21) arranged in the accommodating cavity (11) and an inner magnetic circuit portion (22); the U-yoke (21) is provided with an accommodating recess (211), and the inner magnetic circuit portion (22) is arranged in the accommodating recess (211) and is spaced apart from a side wall of the accommodating recess (211) to form a magnetic gap (23); the side of the inner magnetic circuit portion (22) facing the magnetic gap (23) is provided with a notch slot (2221); the vibration system (3) comprises a diaphragm (31) and a voice coil (32) connected to the diaphragm (31), the diaphragm (31) being connected to the basket (1) and arranged opposite the magnetic circuit system (2); the end of the voice coil (32) away from the diaphragm (31) is suspended in the magnetic gap (23); and the length of the notch slot (2221) in the axial direction of the magnetic gap (23) is defined as a, and the length of the notch slot (2221) in a direction perpendicular to the axial direction of the magnetic gap (23) is defined as b, where 1.8≤a/b≤2.2. The sound production apparatus (100) not only effectively reduces the weight, but also meets the design requirements of miniaturization and the property of being lightwight while ensuring a desirable BL value and linear range.

Description

Sound generating devices and terminal equipment

Technical field

The present invention relates to the technical field of electroacoustic conversion, and in particular to a sound-generating device and terminal equipment using the sound-generating device.

Background technique

A horn, also known as a loudspeaker, is an electroacoustic transducer that converts electrical energy into sound energy through a certain physical effect. When different electronic energies are transmitted to the voice coil of the speaker, the voice coil generates an energy that interacts with the magnetic field of the magnet. This interaction causes the diaphragm to vibrate. Because the electronic energy changes at any time, the voice coil of the speaker will move forward or backward. , so the diaphragm of the speaker will follow the movement. This movement changes the density of the air and produces sound.

In the related art, the washers of speakers are mostly cylindrical or annular, and are bonded to magnets through glue, and together with U iron or T iron form the magnetic circuit system of the speaker. The washer plays a magnetic conductive role and forms a magnetic circuit with the U iron or T iron and the magnet, so that the energized voice coil moves to cut the magnetic field lines and drive the diaphragm to vibrate and produce sound. However, the magnetic permeability of some areas of the disk-shaped or annular washer is very low. Retaining the low magnetic permeability area causes the weight of the washer to increase, which cannot meet the design requirements of miniaturization and lightweight, and there are inconsistencies in BL value and linear range. Good question.

Contents of the invention

The main purpose of the present invention is to provide a sound-generating device and terminal equipment, aiming to provide a sound-generating device that increases the magnetic permeability of Washers. The sound-generating device not only effectively reduces weight and ensures good BL value and linear range, but also can Meet the design requirements of miniaturization and lightweight.

In order to achieve the above object, the present invention proposes a sound-generating device, which includes:

A basin frame, the basin frame is provided with a cavity;

Magnetic circuit system, the magnetic circuit system includes a U iron and an inner magnetic circuit part located in the cavity, the U iron has an accommodating groove, and the inner magnetic circuit part is located in the accommodating groove, And spaced apart from the side walls of the accommodating groove to form a magnetic gap, the inner magnetic circuit part is provided with a notch groove on the side facing the magnetic gap; and

Vibration system, the vibration system includes a diaphragm and a voice coil connected to the diaphragm. The diaphragm is connected to the frame and opposite to the magnetic circuit system. The voice coil is far away from the diaphragm. One end is suspended in the magnetic gap;

Wherein, the length of the notch groove along the axis direction of the magnetic gap is defined as a, and the length of the notch groove along the direction perpendicular to the axis of the magnetic gap is defined as b; where, 1.8≤a/b≤2.2.

In one embodiment, the inner magnetic circuit part includes a stacked inner magnet and an inner washers, and the inner magnets are sandwiched between the inner washers and the bottom wall of the accommodating groove. The notch groove is provided on the side of the washer facing the magnetic gap, and the recessed groove is provided on the side of the inner washers facing away from the inner magnet.

In one embodiment, the inner wall of the recessed groove includes a connected convex arc surface and a concave arc surface, and a side of the convex arc surface away from the concave arc surface is connected to the outer wall of the inner wall.

In one embodiment, the distance from the connection point between the convex arc surface and the outer wall of the inner wall to the notch groove is defined as d1, and the maximum thickness of the inner wall is defined as d2;

Among them, 0.5≤d1/d2≤0.7.

In one embodiment, the vertical distance between the connection between the convex arc surface and the concave arc surface and the connection between the convex arc surface and the outer side wall of the Navas is defined as d3; where, d3/d1 <1/2;

And/or, define the minimum thickness of the Nehua Division as d4, where d4>d1/10.

In one embodiment, the radius of the convex arc surface is defined as R1, and the radius of the concave arc surface is defined as R2; wherein, 5.5mm≤R1≤6.5mm, 3.5≤R1/R2≤4.5;

And/or, the arc length of the convex arc surface is defined as L1, and the arc length of the concave arc surface is defined as L2, where 2.5≤L2/L1≤5.

In one embodiment, the basin frame is provided with a through hole connected to the cavity, the U iron is provided with a first through hole corresponding to the through hole and penetrates the bottom wall of the accommodation tank, and the inner magnet is corresponding to the through hole. The first through hole is provided with a second through hole, the Nehua company is provided with a third through hole corresponding to the second through hole, and the third through hole penetrates the bottom wall of the recessed groove.

In one embodiment, the bottom wall of the accommodating groove protrudes toward the inside of the accommodating groove to form a supporting platform, and the supporting platform is spaced apart from the side walls of the accommodating groove to form an escape groove, so The escape groove is correspondingly connected to the magnetic gap, the inner magnet is supported on the support platform, and the side of the U iron facing away from the bottom wall of the accommodation groove is recessed to form a groove corresponding to the support platform;

And/or, the notch groove is extended along the periphery of the inner wall;

And/or, the notch groove is disposed adjacent to the inner magnet.

In one embodiment, the vibration system further includes a centering ring. The inner side of the centering ring is connected to the outer wall of the voice coil. The inner wall of the cavity is provided with a fixing platform. The outer side of the centering ring is Connected to the fixed platform.

The present invention also provides a terminal device, which includes an equipment housing and the above-mentioned sound-generating device, and the sound-generating device is provided in the equipment housing.

The sound-generating device of the technical solution of the present invention sets a cavity in the basin frame, thereby utilizing the cavity of the basin frame to install, fix and protect the magnetic circuit system and vibration system. By arranging the magnetic circuit system as a U-iron and an inner magnetic circuit part, While installing and fixing the inner magnetic circuit part using the U-iron accommodating groove, the inner magnetic circuit part and the side wall of the U-iron accommodating groove are spaced apart to form a magnetic gap for the voice coil of the vibration system to be suspended. In this way, after the voice coil is energized, The voice coil moves to cut the magnetic flux lines in the magnetic gap of the magnetic circuit system, thereby driving the diaphragm to vibrate and produce sound; a notch is provided on the side of the inner magnetic circuit facing the magnetic gap, thereby canceling the magnetic permeability of the inner magnetic circuit. The lower part is to reduce the weight of the internal magnetic circuit part, and make full use of the high magnetic permeability part of the internal magnetic circuit part to ensure a good BL value and linear range of the sound-generating device while also meeting the requirements of miniaturization and lightweight. Design requirements.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without exerting creative efforts.

Figure 1 is a schematic cross-sectional view of a sound-generating device according to an embodiment of the present invention;

Figure 2 is a schematic cross-sectional exploded view of the sound-generating device in one embodiment of the present invention;

Figure 3 is a schematic cross-sectional view of U iron in an embodiment of the present invention;

Fig. 4 is a schematic cross-sectional view of the Nehua Division in one embodiment of the present invention;

Figure 5 is a schematic diagram of simulated magnetic field lines of the magnetic circuit system in an embodiment of the present invention;

Figure 6 is a schematic diagram of simulated magnetic field lines of a magnetic circuit system in the prior art.

Explanation of reference numbers:

The realization of the purpose, functional features and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiment of the present invention are only used to explain the relationship between components in a specific posture (as shown in the drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

At the same time, the meaning of "and/or" or "and/or" appearing in the whole text is to include three options. Taking "A and/or B" as an example, it includes option A, or option B, or both A and B at the same time. Satisfactory solution.

In addition, descriptions such as "first", "second", etc. in the present invention are for descriptive purposes only and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions in various embodiments can be combined with each other, but it must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that such a combination of technical solutions does not exist. , nor within the protection scope required by the present invention.

A horn, also known as a loudspeaker, is an electroacoustic transducer that converts electrical energy into sound energy through a certain physical effect. When different electronic energies are transmitted to the voice coil of the speaker, the voice coil generates an energy that interacts with the magnetic field of the magnet. This interaction causes the diaphragm to vibrate. Because the electronic energy changes at any time, the voice coil of the speaker will Move forward or backward, so the diaphragm of the speaker will move accordingly. This movement changes the density of the air and produces sound.

Based on the above concepts and problems, the present invention proposes a sound-generating device 100. It can be understood that the sound-generating device 100 is applied to terminal equipment, and the terminal equipment may be a speaker, a car speaker, etc., which is not limited here.

Please refer to FIGS. 1 to 4 . In the embodiment of the present invention, the sound-generating device 100 includes a basin frame 1 , a magnetic circuit system 2 and a vibration system 3 . The basin frame 1 is provided with a cavity 11 , and the magnetic circuit system 2 includes The U iron 21 and the inner magnetic circuit part 22 are arranged in the cavity 11. The U iron 21 has an accommodating groove 211. The inner magnetic circuit part 22 is arranged in the accommodating groove 211 and is spaced from the side wall of the accommodating groove 211. A magnetic gap 23 is formed, and a notch groove 2221 is provided on the side of the inner magnetic circuit part 22 facing the magnetic gap 23. The vibration system 3 includes a diaphragm 31 and a voice coil 32 connected to the diaphragm 31. The diaphragm 31 is connected to the basin frame 1. Opposite to the magnetic circuit system 2, one end of the voice coil 32 away from the diaphragm 31 is suspended in the magnetic gap 23; wherein, the length of the notch groove 2221 along the axis of the magnetic gap 23 is defined as a, and the length of the notch groove 2221 along the axis perpendicular to the magnetic gap 23 is defined as a. The length of the gap 23 in the axial direction is b; among them, 1.8≤a/b≤2.2.

In this embodiment, the basin frame 1 is used to install, fix, support and protect the vibration system 3, the magnetic circuit system 2 and other components, that is, the basin frame 1 provides an installation foundation for the vibration system 3, the magnetic circuit system 2 and other components. It can be understood that the basin frame 1 can be a mounting shell, a casing, a box or other structure having a cavity 11, that is, the basin frame 1 defines a receiving space, which is not limited here.

It can be understood that the basin frame 1 can be selected as a cylindrical, square or horn-shaped structure. The cavity 11 of the basin frame 1 may be a cavity structure open at one end, or of course may be a cavity structure open at both ends. In this embodiment, the basin frame 1 is a cylindrical or basin-shaped structure with one end open. The magnetic circuit system 2 is arranged in the cavity 11 of the basin frame 1. By connecting the periphery of the diaphragm 31 of the vibration system 3 with one end of the basin frame 1 The connection is fixed and the opening is covered so that the diaphragm 31 faces the magnetic circuit system 2 to enclose the vibration space of the sound-generating device 100 .

In this embodiment, the magnetic circuit system 2 includes a U iron 21 and an inner magnetic circuit part 22. The U iron 21 is in the shape of a U At this time, the U-iron 21 has an accommodating groove 211 open at one end. The U-iron 21 is arranged in the cavity 11 of the basin frame 1. The notch of the accommodating groove 211 is opposite to the diaphragm 31. The inner magnetic circuit part 22 is provided with In the accommodating groove 211 and spaced apart from the side walls of the accommodating groove 211 to form a magnetic gap 23, the voice coil 32 of the vibration system 3 is located in the vibration space of the sound-generating device 100, so that one end of the voice coil 32 is in contact with the diaphragm. 31 is connected, and the other end of the voice coil 32 is suspended in the magnetic gap 23. When the voice coil 32 is energized, the voice coil 32 introduces electric energy into the magnetic gap 23 of the magnetic circuit system 2. Under the action of the magnetic field of the magnetic circuit system 2, The voice coil 32 is driven to cut the magnetic field lines, thereby converting electrical energy into mechanical energy. When the voice coil 32 moves, it drives the diaphragm 32 to vibrate, thereby causing the diaphragm 32 to vibrate and produce sound. This converts mechanical energy into sound energy, thereby achieving electroacoustic conversion.

It can be understood that when the basin frame 1 is a metal piece, the magnetic circuit system 2 and the basin frame 1 are fixed by bonding or welding, thereby improving the heat dissipation effect of the sound-generating device 100. In another embodiment, when the basin frame 1 is made of plastic injection molding, the U iron 21 of the magnetic circuit system 2 can also be injection molded into the basin frame 1 as an insert, or the magnetic circuit system 2 and the basin frame 1 can be fixed by adhesive. Then other parts are bonded and fixed, which is not limited here.

In this embodiment, as shown in Figures 1 to 4, a notch groove 2221 is provided on the side of the inner magnetic circuit portion 22 facing the magnetic gap 23, and the length of the notch groove 2221 along the axis of the magnetic gap 23 is defined as a, The length of the notch groove 2221 along the direction perpendicular to the axis of the magnetic gap 23 is defined as b, so that the ratio range of the length a of the notch groove 2221 along the axis of the magnetic gap 23 to the length b of the notch groove 2221 along the direction perpendicular to the axis of the magnetic gap 23 is in the range of 1.8 Within the range of ~2.2, the notch groove 2221 is provided on the inner magnetic circuit part 22 to eliminate the low magnetic permeability part of the inner magnetic circuit part 22, thereby reducing the weight of the inner magnetic circuit part 22, so that the inner magnetic circuit part 22 can be fully utilized. The path portion 22 has a high magnetic permeability portion to ensure a good BL value and linear range of the sound-generating device 100 while also meeting the design requirements of miniaturization and lightweight.

It can be understood that the axial direction of the magnetic gap 23 is the moving direction of the voice coil 32 , and the axial direction perpendicular to the magnetic gap 23 is the direction from the inner magnetic circuit part 22 to the side wall of the U-iron 21 accommodating groove 211 . Optionally, the ratio of the length a of the notch groove 2221 along the axis direction of the magnetic gap 23 to the length b of the notch groove 2221 along the direction perpendicular to the axis of the magnetic gap 23 is 1.8, 1.9, 2, 2.1, 2.2, etc., which is not limited here. .

The sound-generating device 100 of the present invention is provided with a cavity 11 in the basin frame 1, thereby using the cavity 11 of the basin frame 1 to install, fix and protect the magnetic circuit system 2 and the vibration system 3. By arranging the magnetic circuit system 2 as a U iron 21 and the inner magnetic circuit part 22, use the accommodating groove 211 of the U iron 21 to install and fix the inner magnetic circuit part 22, so that the inner magnetic circuit part 22 is spaced apart from the side walls of the accommodating groove 211 of the U iron 21 to form a vibration system. 3. The magnetic gap 23 in which the voice coil 32 is suspended. After the voice coil 32 is energized, the voice coil moves to cut the magnetic flux lines in the magnetic gap 23 of the magnetic circuit system 2, thereby driving the diaphragm 31 to vibrate and produce sound; The side of the magnetic circuit part 22 facing the magnetic gap 23 is provided with a notch groove 2221, thereby eliminating the low magnetic permeability part of the inner magnetic circuit part 22 to reduce the weight of the inner magnetic circuit part 22 and making full use of the conductivity of the inner magnetic circuit part 22. The part with high magnetic rate ensures good BL value and linear range of the sound-generating device 100 while also meeting the design requirements of miniaturization and lightweight.

In one embodiment, the inner magnetic circuit part 22 includes a stacked inner magnet 221 and an inner washer 222. The inner magnet 221 is sandwiched between the inner washer 222 and the bottom wall of the accommodating groove 211. The inner washer 222 faces A notch groove 2221 is provided on one side of the magnetic gap 23 , and a recessed groove 2222 is provided on the side of the inner magnet 222 facing away from the inner magnet 221 .

In this embodiment, as shown in Figures 1, 2 and 4, the inner magnetic circuit part 22 includes an inner magnet 221 and an inner valve 222. The inner magnet 221 can be a magnet, and the inner valve 222 can be a magnetic conductor. board structure. The shape outline of the inner magnet 221 is the same as or consistent with the shape outline of the inner magnet 222 . Optionally, the inner magnet 221 and the inner magnet 222 can be circular, oval, square or track-shaped, etc., which are not limited here.

It can be understood that the shapes and contours of the inner magnets 221 and the inner washers 222 of the inner magnetic circuit part 22 are generally similar to the shapes and contours of the accommodating groove 211 of the U-iron 21 . Optionally, the U iron 21 is a cylindrical structure with one end open. In this embodiment, a notch groove 2221 is provided on the side of the inner magnet 222 facing the magnetic gap 23, and a recessed groove 2222 is provided on the side of the inner magnet 222 facing away from the inner magnet 221, so that the inner magnet 222 is 222 forms a stepped structure, so that the notched groove 2221 and the recessed groove 2222 are further used to further eliminate the low magnetic permeability part of the inner wall 222, so as to reduce the weight of the inner wall 222, achieve the purpose of weight reduction, and at the same time ensure that the inner wall 222 is in Magnetic permeability and magnetic field strength under the action of inner magnet 221.

In this embodiment, the notch groove 2221 may be a notch, a groove, or other structures. The recessed groove 2222 may be a groove structure or a through-groove structure, which is not limited here. The recessed groove 2222 is formed by recessing the side of the inner valve 222 away from the inner magnet 221 toward the inner magnet 221 . Optionally, the depressed groove 2222 is located in the middle of the inner valve 222 .

In order to further increase the magnetic flux density at the magnetic gap 23, the inner wall of the recessed groove 2222 is arranged in an arc surface, so that the air flow generated by the vibration of the diaphragm 31 flows more smoothly. In this embodiment, as shown in Figures 5 and 6, the notch groove 2221 and the recessed groove 2222 of the inner valve 222 of the present invention cooperate to remove the low magnetic permeability part of the inner valve 222, so that the magnetic conductivity of the inner valve 222 can be improved. The flux density increases, which can effectively reduce the weight of Nehuasi 222 and improve the efficiency of Nehuasi 222 while ensuring the magnetic flux.

It can be understood that in order to ensure that the voice coil 32 of the vibration system 3 can be cut within the magnetic gap 23 When the magnetic field lines move, a constant number of voice coils can be maintained at the maximum displacement within the magnetic gap 23. The voice coil 32 adopts a long voice coil and cooperates with the stepped inner valve 222 so that the inner valve 222 is adjacent to the magnetic gap 23. The step-like structure can increase the magnetic flux density at the magnetic gap 23, ensuring that the sound-generating device 100 has higher sensitivity, and increasing the linear range of the sound-generating device 100 while ensuring the BL value.

Optionally, the notch groove 2221 extends along the periphery of the inner wall 222 , such that the notch groove 2221 extends along the circumferential direction of the magnetic gap 23 to form an annular groove structure located on the outer wall of the inner wall 222 . In order to further ensure the magnetic flux density of the inner magnet 222 at the magnetic gap 23 , the notch groove 2221 is provided adjacent to the inner magnet 221 .

In this embodiment, the notch groove 2221 penetrates the bottom surface of the inner valve 222 facing the inner magnet 221 , so that the outer wall of the inner valve 222 facing the magnetic gap 23 is arranged in a stepped manner.

In one embodiment, the basin frame 1 is provided with a through hole 12 communicating with the cavity 11 , the U iron 21 is provided with a first through hole 212 corresponding to the through hole 12 and penetrating the bottom wall of the accommodating groove 211 , and the inner magnet 221 is corresponding to the first through hole 12 . The hole 212 is provided with a second through hole 2211, the Nehua 222 is provided with a third through hole 2223 corresponding to the second through hole 2211, and the third through hole 2223 penetrates the bottom wall of the recessed groove 2222.

In this embodiment, as shown in FIGS. 1 to 4 , a through hole 12 is provided on the basin frame 1 and a through hole structure is provided on the inner magnetic circuit part 22 corresponding to the through hole 12 , so that the voice coil 32 drives vibration. When the membrane 31 vibrates, it ensures that the air pressure in the vibration space is balanced. It can be understood that the through hole 12 is opened in the bottom wall of the cavity 11 of the basin frame 1 and penetrates the bottom wall of the cavity 11 . The inner magnetic circuit part 22 is fixed on the bottom wall of the cavity 11 of the basin frame 1 . The U iron 21 , the inner magnet 221 and the inner washers 222 of the inner magnetic circuit part 22 are respectively provided with a first through hole 212 and a second through hole 12 corresponding to the through hole 12 . Through hole 2211 and third through hole 2223.

It can be understood that the first through hole 212, the second through hole 2211 and the third through hole 2223 are coaxially arranged. The first through hole 212 , the second through hole 2211 and the third through hole 2223 have the same shape and outline. The first through hole 212 , the second through hole 2211 and the third through hole 2223 can be round holes, elliptical holes or triangular holes. Or square holes, etc., which are not limited here.

In this embodiment, the third through hole 2223 penetrates the bottom wall of the recessed groove 2222, which can further reduce the weight of the inner wall 222 and achieve the purpose of weight reduction. Optionally, the third through hole 2223 is provided in the middle or middle position of the recessed groove 2222, which can ensure uniform magnetic flux density in the magnetic gap 23, avoid polarization or swing of the voice coil 32, and improve the performance of the sound-generating device 100. sound effects.

In one embodiment, the inner wall of the recessed groove 2222 includes a connected convex arc surface 2224 and a concave arc surface 2225. The side of the convex arc surface 2224 away from the concave arc surface 2225 is connected to the outer wall of the interior washbasin 222. The side of the arcuate surface 2225 away from the convex arcuate surface 2224 is connected to the hole wall of the third through hole 2223 .

In this embodiment, as shown in Figures 2 and 4, the inner wall of the recessed groove 2222 is configured as a connected convex arc surface 2224 and a concave arc surface 2225, so that the convex arc surface 2224 is located at the edge of the concave arc surface 2225. , and is connected with the outer wall of the inner wall 222 to ensure that the upper end of the inner wall 222 is arranged in a smooth transition to uniformize the magnetic flux lines and further increase the magnetic flux density at the magnetic gap 23 . Optionally, the connection between the convex arc surface 2224 and the concave arc surface 2225 is arranged in a smooth transition, that is, the inner wall of the recessed groove 2222 has a smooth arc structure, so that the airflow generated by the vibration of the diaphragm 31 flows more smoothly.

In one embodiment, the distance from the connection point between the convex arc surface 2224 and the outer wall of the inner wall 222 to the notch groove 2221 is defined as d1, and the maximum thickness of the inner wall 222 is defined as d2; where, 0.5≤d1/d2≤ 0.7.

In this embodiment, as shown in FIG. 4 , by ensuring the length of the inner wall 222 adjacent to the outer wall of the magnetic gap 23 , the magnetic flux density of the inner wall 222 at the magnetic gap 23 is ensured. It can be understood that the length of the outer wall of the inner wall 222 adjacent to the magnetic gap 23 is the distance d1 from the connection between the convex arc surface 2224 and the outer wall of the inner wall 222 to the notch groove 2221 . The maximum thickness d2 of the inner wall 222 is the vertical distance from the connection point between the convex arc surface 2224 and the outer wall of the inner wall 222 to the bottom surface of the inner magnet 221 facing the inner wall 222 .

Optionally, the ratio of the distance d1 from the connection between the convex arc surface 2224 and the outer wall of the inner wall 222 to the notch groove 2221 and the maximum thickness d2 of the inner wall 222 ranges from 0.5 to 0.7. Optionally, d1/d2 The ratios are 0.5, 0.6, 0.7, etc., which are not limited here.

In one embodiment, the vertical distance between the connection between the convex arc surface 2224 and the concave arc surface 2225 and the connection between the convex arc surface 2224 and the outer wall of the interior wall 222 is defined as d3; wherein, d3/d1<1/2 .

In this embodiment, as shown in FIG. 4 , by defining the vertical distance from the connection point of the convex arc surface 2224 and the concave arc surface 2225 to the side of the inner valve 222 facing away from the inner magnet 221 , it is further ensured that the inner valve 222 is adjacent to the inner magnet 221 . Magnetic flux density at magnetic gap 23. It can be understood that the vertical distance d3 between the connection between the convex arc surface 2224 and the concave arc surface 2225 and the connection between the convex arc surface 2224 and the outer wall of the interior wall 222 is from the connection between the convex arc surface 2224 and the concave arc surface 2225 to The vertical distance from the inner magnet 221 side of the internal magnet 222.

It can be understood that the vertical distance d3 between the connection between the convex arc surface 2224 and the concave arc surface 2225 and the connection between the convex arc surface 2224 and the outer wall of the inner wall 222 is the same as the vertical distance d3 between the convex arc surface 2224 and the outer wall of the inner wall 222. The ratio range of the distance d1 from the connection to the notch groove 2221 is less than 1/2, so that the inner wall 222 adjacent to the magnetic gap 23 is stepped, which can increase the magnetic flux density at the magnetic gap 23 and ensure that the sound-generating device The setting 100 has higher sensitivity and can increase the linear range of the sound-generating device 100 while ensuring the BL value.

In one embodiment, the minimum thickness of the inner wall 222 is defined as d4, where d4>d1/10. It can be understood that the thickness of the Nehua element 222 is the thickness along the axial direction of the magnetic gap 23 , that is, the thickness of the voice coil 32 along the moving direction of the magnetic gap 23 .

Optionally, the thickness of the inner tube 222 gradually decreases from the direction adjacent to the magnetic gap 23 to the third through hole 2223, by defining the minimum thickness d4 of the inner tube 222 to be greater than 1/10 of the convex arc surface. The distance d1 from the connection point between 2224 and the outer wall of the inner valve 222 to the notch groove 2221 (that is, the length of the outer wall of the inner valve 222 facing the magnetic gap 23), thereby ensuring the magnetic flux density of the inner valve 222.

In one embodiment, the radius of the convex arc surface 2224 is defined as R1, and the radius of the concave arc surface 2225 is defined as R2; where, 5.5mm≤R1≤6.5mm, 3.5≤R1/R2≤4.5.

In this embodiment, as shown in FIG. 4 , both the convex arc surface 2224 and the concave arc surface 2225 are in arc-shaped structures, passing through the connection between the convex arc surface 2224 and the concave arc surface 2225 and perpendicular to the axial direction of the magnetic gap 23 The center of the convex arc surface 2224 and the center of the concave arc surface 2225 are located on opposite sides of the plane.

Optionally, the radius R1 of the convex arc surface 2224 is 5.5 mm to 6.5 mm. In this embodiment, the radius R1 of the convex arc surface 2224 is 5.5mm, 5.8mm, 6mm, 6.3mm, 6.5mm, etc., which is not limited here.

Optionally, the ratio of the radius R1 of the convex arc surface 2224 to the radius R2 of the concave arc surface 2225 ranges from 3.5 to 4.5. In this embodiment, the ratio of the radius R1 of the convex arc surface 2224 to the radius R2 of the concave arc surface 2225 is 3.5, 3.6, 3.7, 3.8, 3.9, 4, 4.1, 4.2, 4.3, 4.4, 4.5, etc., which are not specified here. Make limitations.

In this embodiment, the arc length of the convex arc surface 2224 is defined as L1, and the arc length of the concave arc surface 2225 is defined as L2, where 2.5≤L2/L1≤5. Optionally, the ratio of the arc length L2 of the concave arc surface 2225 to the arc length L1 of the convex arc surface 2224 is 2.5, 3, 3.5, 4, 4.5, 5, etc., which is not limited here.

In this embodiment, as shown in FIG. 4 , the connection between the concave arc surface 2225 and the hole wall of the third through hole 2223 is provided with a rounded corner. It is understandable that the radius of the fillet is defined as R3, 1.5mm≤R3≤2.5mm, so as to ensure that the airflow generated by the vibration of the diaphragm 31 flows more smoothly.

In one embodiment, the bottom wall of the accommodating groove 211 protrudes toward the inside of the accommodating groove 211 to form a supporting platform 213. The supporting platform 213 is spaced apart from the side walls of the accommodating groove 211 to enclose a relief groove 214. 214 is connected with the magnetic gap 23 correspondingly, the inner magnet 221 is supported on the support platform 213, and the U iron 21 faces away from the bottom of the accommodation groove 211 One side of the wall is recessed to form a groove 215 corresponding to the support platform 213 . The first through hole 212 penetrates the support platform 213 and communicates with the groove 215 .

In this embodiment, as shown in FIGS. 1 to 3 , a supporting platform 213 is provided on the bottom wall of the accommodating groove 211 of the U iron 21 so that the supporting platform 213 is spaced apart from the side walls of the accommodating groove 211 to form an enclosed structure. The relief groove 214 is connected with the magnetic gap 23 correspondingly, so that while the support platform 213 is used to support and fix the inner magnetic circuit part 22, the relief groove 214 is used to avoid the movement of the voice coil 32 in the magnetic gap 23. , to ensure the amplitude of the sound-generating device 100.

It can be understood that the support platform 213 may be a convex structure protruding from the bottom wall of the accommodating groove 211 . Of course, the support platform 213 can also be formed by a side of the U iron 21 facing away from the bottom wall of the accommodating groove 211 and protruding toward the inside of the accommodating groove 211, which is not limited here. Optionally, the side of the U iron 21 facing away from the bottom wall of the accommodation groove 211 is recessed to form a groove 215 corresponding to the support platform 213 . The first through hole 212 penetrates the support platform 213 and communicates with the groove 215 .

In one embodiment, as shown in Figures 1 and 2, the vibration system 3 also includes a centering ring 33. The inner side of the centering ring 33 is connected to the outer wall of the voice coil 32. The inner wall of the cavity 11 is provided with a fixing platform 13. The outer side of the core ring 33 is connected to the fixed platform 13 . It can be understood that by providing the centering ring 33, the centering ring 33 can be used to effectively prevent the voice coil 32 from being polarized or swinging left and right during the vibration process, thereby improving the vibrating sound effect of the diaphragm 31.

It can be understood that the fixing platform 13 can be a boss structure formed by protruding from the inner wall of the cavity 11 , or it can be a step structure formed by the inner wall of the cavity 11 , which is not limited here.

The present invention also proposes a terminal equipment, which includes an equipment housing and the above-mentioned sound-generating device 100. The sound-generating device 100 is provided in the equipment housing. The specific structure of the sound-generating device 100 refers to the aforementioned embodiments. Since this terminal device adopts all the technical solutions of all the aforementioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the aforementioned embodiments, and will not be detailed here. Repeat.

The above are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Under the concept of the present invention, equivalent structural transformations can be made using the contents of the description and drawings of the present invention, or direct/indirect application Other related technical fields are included in the patent protection scope of the present invention.

Claims

A sound-generating device, characterized in that the sound-generating device includes:

A basin frame, the basin frame is provided with a cavity;

Magnetic circuit system, the magnetic circuit system includes a U iron and an inner magnetic circuit part located in the cavity, the U iron has an accommodating groove, and the inner magnetic circuit part is located in the accommodating groove, And spaced apart from the side walls of the accommodating groove to form a magnetic gap, the inner magnetic circuit part is provided with a notch groove on the side facing the magnetic gap; and

Vibration system, the vibration system includes a diaphragm and a voice coil connected to the diaphragm. The diaphragm is connected to the frame and opposite to the magnetic circuit system. The voice coil is far away from the diaphragm. One end is suspended in the magnetic gap;

Wherein, the length of the notch groove along the axis direction of the magnetic gap is defined as a, and the length of the notch groove along the direction perpendicular to the axis of the magnetic gap is defined as b; where, 1.8≤a/b≤2.2.
The sound-generating device according to claim 1, characterized in that the inner magnetic circuit part includes a stacked inner magnet and an inner washer, and the inner magnet is sandwiched between the inner washer and the accommodation groove. Between the bottom walls, the notched groove is provided on the side of the inner tube facing the magnetic gap, and the recessed groove is provided on the side of the inner tube facing away from the inner magnet.
The sound-generating device according to claim 2, wherein the inner wall of the recessed groove includes a connected convex arc surface and a concave arc surface, and the side of the convex arc surface away from the concave arc surface is connected with the inner wall. The lateral wall connection of the washer.
The sound-generating device according to claim 3, wherein the distance from the connection point between the convex arc surface and the outer wall of the inner wall to the notch groove is defined as d1, and the maximum distance of the inner wall is defined as d1. The thickness is d2;

Among them, 0.5≤d1/d2≤0.7.
The sound-generating device according to claim 4, wherein the vertical distance between the connection between the convex arc surface and the concave arc surface and the connection between the convex arc surface and the outer wall of the inner wall is defined. is d3; among them, d3/d1<1/2;

And/or, define the minimum thickness of the Nehua Division as d4, where d4>d1/10.
The sound-generating device according to claim 3, wherein the radius of the convex arc surface is defined as R1, and the radius of the concave arc surface is defined as R2; wherein, 5.5mm≤R1≤6.5mm, 3.5≤R1/ R2≤4.5;

And/or, the arc length of the convex arc surface is defined as L1, and the arc length of the concave arc surface is defined as L2, where 2.5≤L2/L1≤5.
The sound-generating device according to claim 2, characterized in that the basin frame is provided with a through hole communicating with the accommodation cavity, and the U iron is provided with a first through hole corresponding to the through hole and penetrating the bottom wall of the accommodation tank. Through hole, the inner magnet is provided with a second through hole corresponding to the first through hole, the inner magnet is provided with a third through hole corresponding to the second through hole, and the third through hole penetrates the depression The bottom wall of the tank.
The sound-generating device according to claim 2, wherein the bottom wall of the accommodating groove protrudes toward the inside of the accommodating groove to form a supporting platform, and the supporting platform is spaced apart from the side walls of the accommodating groove. Enclosed to form an escape slot, the escape slot is connected to the magnetic gap, the inner magnet is supported on the support platform, and the side of the U iron facing away from the bottom wall of the accommodation slot corresponds to the The support platform is depressed to form a groove;

And/or, the notch groove is extended along the periphery of the inner wall;

And/or, the notch groove is disposed adjacent to the inner magnet.
The sound-generating device according to any one of claims 1 to 8, wherein the vibration system further includes a centering ring, the inner side of the centering ring is connected to the outer wall of the voice coil, and the cavity The inner wall of the centering ring is provided with a fixed platform, and the outer side of the centering ring is connected to the fixed platform.
A terminal device, characterized in that it includes an equipment housing and a sound-generating device according to any one of claims 1 to 9, the sound-generating device being provided in the equipment housing.