WO2024022489A1

WO2024022489A1 - Sound production apparatus and terminal device

Info

Publication number: WO2024022489A1
Application number: PCT/CN2023/109841
Authority: WO
Inventors: 高岩; 李世田; 张凯; 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: CN115103279A

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). The magnetic circuit system (2) comprises a U-shaped iron (21), an inner magnetic circuit portion (22), and an outer magnetic circuit portion (23). The inner magnetic circuit portion (22) is arranged in an accommodating recess (211) of the U-shaped iron (21), and the outer magnetic circuit portion (23) is arranged on a supporting surface (212) of the U-shaped iron (21) and is connected to the basket (1). The outer magnetic circuit portion (23) is matched with the U-shaped iron (21) to cover an opening at one end of an accommodating cavity (11). The side wall and the outer magnetic circuit portion (23) of the accommodating recess (211) are spaced apart from the inner magnetic circuit portion (22) to form a magnetic gap (24). The side of the inner magnetic circuit portion (22) facing the magnetic gap (24) is provided with a notch groove (2221). The vibration system (3) comprises a diaphragm (31) and a voice coil (32) connected to the vibrating diaphragm (31). The vibrating diaphragm (31) is connected to the basket (1) and covers an opening at the other end of the accommodating cavity (11). The end of the voice coil (32) away from the vibrating diaphragm (31) is suspended in the magnetic gap (24). The sound production apparatus (100) can effectively reduce the weight and ensure a good BL value and a good linear range, and can also meet the design requirements of miniaturization and light weight.

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 ensures good BL value and linear range. The sound-generating device not only effectively reduces the weight, but also ensures good BL value and linear range. It can also 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 open at both ends;

Magnetic circuit system, the magnetic circuit system includes a U iron, an inner magnetic circuit part and an outer magnetic circuit part, the U iron has a receiving slot, the inner magnetic circuit part is arranged in the receiving slot, the U iron The end surface of the iron adjacent to the notch of the accommodating groove forms a supporting surface. The external magnetic circuit part is provided on the supporting surface and is connected to the basin frame. The external magnetic circuit part cooperates with the U iron to cover The opening of one end of the cavity is closed, the side wall of the accommodation groove and the outer magnetic circuit part are spaced apart from the inner magnetic circuit part to form a magnetic gap, and the inner magnetic circuit part faces one side of the magnetic gap. Notched slots are provided on the sides; and

Vibration system, the vibration system includes a diaphragm and a voice coil connected to the diaphragm, the diaphragm Connected to the basin frame and covering the opening at the other end of the cavity, one end of the voice coil away from the diaphragm is suspended in the magnetic gap.

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;

The outer magnetic circuit part includes stacked outer magnets and outer washers. The outer magnets are sandwiched between the outer washers and the support surface. The outer washers are connected to the basin frame.

In one embodiment, a recessed groove is provided on a side of the Nevas facing away from the inner magnet.

In one embodiment, the thickness of the inner magnet is defined as h1, and the thickness of the outer magnet is defined as h2, where 0.8≤h1/h2≤1.2;

And/or, define the maximum thickness of the inner washboard as t1, and define the thickness of the outer washboard as t2, where 2≤t1/t2≤2.5;

And/or, define the radius of the inner wall as d1, and define the width of the outer wall as d2, where 1.5≤d1/d2≤2;

And/or, the cross section of the recessed groove is semicircular, the radius of the recessed groove is defined as R, the maximum thickness of the inner wall is defined as t1, and the radius of the inner wall is defined as d1, where, t1＜R＜d1.

In one embodiment, the notch groove extends along the periphery of the Nevas;

And/or, the notch groove is provided adjacent to the inner magnet;

And/or, the outer washer is provided with a limiting protrusion on a side facing away from the magnetic gap, the basin is provided with a limiting groove, and the limiting protrusion is accommodated and limited in the limiting groove.

In one embodiment, the inner magnetic circuit part further includes a short-circuit ring, and the short-circuit ring includes a first section and a second section arranged at an angle, and the first section is away from the Newasi and the One side of the inner magnet is connected, and the second section is attached to the side of the Newas facing the magnetic gap and extends to the inner magnet to cover the notch.

In one embodiment, the length of the notch groove along the axis 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, a boss is protruding from the bottom wall of the accommodating groove. The boss is spaced from the side wall of the accommodating groove and encloses a relief groove that communicates with the accommodating groove. The escape groove corresponds to the magnetic gap, and the inner magnetic circuit is partially supported on the boss;

And/or, a groove is recessed on the side of the U-iron back toward the opening of the accommodating groove.

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 basin frame is protrudingly provided with a fixing platform. The outer side of the centering ring is connected to the outer wall of the voice coil. The fixed platform connection;

And/or, the U iron extends adjacent to the support surface toward a side away from the accommodation groove to form a support platform, the support platform is flush with the support surface, and the external magnetic circuit part is supported on the support surface and said support 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 up a cavity with openings at both ends in the basin frame, thereby using the basin frame to install, fix and protect the magnetic circuit system and the vibration system. The magnetic circuit system is configured as a U iron and an inner magnetic circuit part. And the outer magnetic circuit part, use the U-iron holding slot to install and fix the inner magnetic circuit part, and set the outer magnetic circuit part on the supporting surface of the U-iron, so that the inner magnetic circuit part is in contact with the side wall of the U-iron holding groove. The outer magnetic circuit partially encloses a magnetic gap for the voice coil of the vibration system to be suspended. After the voice coil is energized, the voice coil moves to cut the magnetic field lines in the magnetic gap of the magnetic circuit system, thereby driving the diaphragm to vibrate and produce sound; through There is a notch groove on the side of the inner magnetic circuit facing the magnetic gap, thereby eliminating the low magnetic permeability part of the inner magnetic circuit part to reduce the weight of the inner magnetic circuit part and making full use of the high magnetic permeability part of the inner magnetic circuit part. , to ensure good BL value and linear range of the sound-generating device, while also meeting the design requirements of miniaturization and lightweight.

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 view of the magnetic circuit system in one embodiment of the present invention;

Figure 3 is a schematic cross-sectional view of the magnetic circuit system in one embodiment of the present invention;

Figure 4 is an enlarged schematic diagram of a partial cross-section of the magnetic circuit system in one embodiment of the present invention;

Figure 5 is a schematic cross-sectional view of U iron in an embodiment of the present invention;

Figure 6 is a schematic diagram of simulated magnetic field lines of part of the magnetic circuit system in an embodiment of the present invention;

Figure 7 is a schematic diagram of simulated magnetic field lines of part of the magnetic circuit system in the prior art;

Figure 8 is a BL curve diagram of the sound-generating device in one embodiment of the present invention and 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.

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 5 . 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 open at both ends. , the magnetic circuit system 2 includes a U iron 21, an inner magnetic circuit part 22 and an outer magnetic circuit part 23. The U iron 21 has an accommodating slot 211, the inner magnetic circuit part 22 is arranged in the accommodating slot 211, and the U iron 21 is adjacently accommodated. The end surface of the groove 211 forms a supporting surface 212. The external magnetic circuit part 23 is located on the supporting surface 212 and is connected to the basin frame 1. The external magnetic circuit part 23 and the U iron 21 cooperate to cover the opening at one end of the cavity 11. The side wall of the groove 211 and the outer magnetic circuit part 23 are spaced apart from the inner magnetic circuit part 22 to form a magnetic gap 24. The inner magnetic circuit part 22 is provided with a notch groove 2221 on the side facing the magnetic gap 24. 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 basket 1 and covers the opening at the other end of the cavity 11. The voice coil 32 is away from the diaphragm. One end of 31 is suspended in the magnetic gap 24.

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 with one end open, or of course, a cavity structure with both ends open. Alternatively, the basin frame 1 may be a trumpet-shaped or basin-shaped structure open at both ends. In this embodiment, the basin frame 1 is a columnar or basin-shaped structure with openings at both ends. The magnetic circuit system 2 is located at the opening at one end of the basin frame 1. By connecting the periphery of the diaphragm 31 of the vibration system 3 with the other end of the basin frame 1 One end is connected and fixed, and the opening at the other end is covered, so that the diaphragm 31 faces the magnetic circuit system 2 and is enclosed with the basin frame 1 to form the vibration space of the sound-generating device 100 .

In this embodiment, the magnetic circuit system 2 includes a U iron 21, an inner magnetic circuit part 22 and an outer magnetic circuit part 23. The U iron 21 is arranged in a U shape. At this time, the U iron 21 has an accommodating groove 211 with one end open. The iron 21 is arranged at the opening of one end of the basin frame 1. The accommodating groove 211 of the U iron 21 is connected with the cavity 11. The notch of the accommodating groove 211 is opposite to the diaphragm 31. The U iron 21 is adjacent to the notch of the accommodating groove 211. The end surface forms a supporting surface 212, the outer magnetic circuit part 23 is provided on the supporting surface 212, and is connected to the basin frame 1, and the inner magnetic circuit part 22 is provided in the accommodating groove 211, so that the side walls of the accommodating groove 211 and the external magnetic circuit part 23 is spaced apart from the inner magnetic circuit part 22 to form a magnetic gap 24. 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 connected to the diaphragm 31, and the other end of the voice coil 32 is suspended In the magnetic gap 24, when the voice coil 32 is energized, the voice coil 32 introduces electric energy into the magnetic gap 24 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. In this way, electrical energy is converted into mechanical energy. When the voice coil 32 moves, it drives the diaphragm 32 to vibrate, so that the diaphragm 32 vibrates and produces sound. In this way, the mechanical energy is converted into sound energy, thereby realizing 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 magnetic conductive plate of the external magnetic circuit part 23 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 can be 1. Use bonding to fix, and then other parts to bond and fix. There is no limit here.

In this embodiment, the inner magnetic circuit part 22 is disposed in the accommodating groove 211, which can reduce the longitudinal space of the sound-generating device 100, lower the height of the product, and can be used in a narrower space, achieving a compact product. At the same time, compared with the traditional design, this structure prevents the diaphragm 31 from interfering with the magnetic circuit system 2 when operating at a large amplitude. At the same time, an external magnetic circuit part 23 is provided on the supporting surface 212 formed on the end surface of the U-iron 21 adjacent to the notch of the accommodating groove 211, thereby further increasing the magnetic field intensity.

In this embodiment, as shown in Figures 1 to 4, the outer magnetic circuit part 23 is installed and fixed on the end surface of the U iron 21, and the inner magnetic circuit part 22 is provided in the receiving groove 211 of the U iron 21, using the inner magnetic circuit part 23. The magnetic circuit part 22 , the external magnetic circuit part 23 and the U iron 21 increase the magnetic field intensity and magnetic flux density to increase the driving force of the voice coil 32 . At the same time, by providing the notch groove 2221 on the side of the inner magnetic circuit part 22 facing the magnetic gap 24, the notch groove 2221 is provided on the inner magnetic circuit part 22, thereby eliminating the part with low magnetic permeability on the inner magnetic circuit part 22, thereby Reduce the weight of the inner magnetic circuit part 22, so that the high magnetic permeability part of the inner magnetic circuit part 22 can be fully utilized to ensure a good BL value and linear range of the sound-generating device 100 while also meeting the requirements of miniaturization and lightweight design. Require.

The sound-generating device 100 of the present invention uses the basin frame 1 to install, fix and protect the magnetic circuit system 2 and the vibration system 3 by arranging a cavity 11 open at both ends in the basin frame 1, and by configuring the magnetic circuit system 2 as a U iron 21. The inner magnetic circuit part 22 and the outer magnetic circuit part 23 are installed and fixed using the receiving groove 211 of the U iron 21, and the outer magnetic circuit part 23 is set on the supporting surface 212 of the U iron 21, so that the inner magnetic circuit part 23 is installed and fixed. The magnetic circuit part 22 is enclosed with the side wall of the accommodating groove 211 of the U iron 21 and the outer magnetic circuit part 23 to form a magnetic gap 24 for the voice coil 32 of the vibration system 3 to be suspended. In this way, after the voice coil 32 is energized, the voice coil 32 The movement of cutting the magnetic field lines in the magnetic gap 24 of the magnetic circuit system 2 drives the diaphragm 31 to vibrate and produce sound; a notch 2221 is provided on the side of the inner magnetic circuit part 22 facing the magnetic gap 24, thereby canceling the inner magnetic field. The low magnetic permeability part of the inner magnetic circuit part 22 is used to reduce the weight of the inner magnetic circuit part 22, and the part with high magnetic permeability of the inner magnetic circuit part 22 is fully utilized to ensure a good BL value and linear range of the sound-generating device 100 while also ensuring a good BL value and linear range. It can meet 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 One side of the magnetic gap 24 is provided with a notch groove 2221; the outer magnetic circuit part 23 includes a stacked outer magnet 231 and an outer washer 232. The outer magnet 231 is sandwiched between the outer washer 232 and the supporting surface 212. The outer washer 232 is arranged in a stack. 232 is connected to the basin frame 1.

In this embodiment, as shown in FIGS. 1 to 4 , the inner magnetic circuit part 22 includes an inner magnet 221 and an inner magnet 222 . The inner magnet 221 can be a magnet, and the inner magnet 222 can be a magnetic conductive plate 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, inner magnet 221 and Nehua Division 222 can be round, oval, square or track-shaped, etc., and is not limited here. It can be understood that the outer magnetic circuit part 23 includes an outer magnet 231 and an outer washer 232. The outer magnet 231 can be a magnet, and the outer washer 232 can be a magnetic conductive plate structure. The shape outline of the outer magnet 231 is the same as or consistent with the shape outline of the outer washer 232 . Optionally, the outer magnet 231 and the outer washer 232 can be in the shape of a circular ring, an elliptical ring, a square ring or a track ring, etc., which are not limited here.

It can be understood that the shape and contour of the inner magnet 221 and the inner washers 222 of the inner magnetic circuit part 22 are roughly similar to the shape and contour of the receiving groove 211 of the U iron 21, and the shapes and contours of the outer magnet 231 and the outer washers 232 of the outer magnetic circuit part 23 are similar. The shape and outline are roughly similar to the shape and outline of the notch 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, the supporting surface 212 of the U iron 21 is bonded and fixed with the outer magnet 231 of the outer magnetic circuit part 23. The outer magnet 231 and the outer washer 232 are bonded and fixed. The outer magnetic circuit part 23 passes through the outer washer. 232 is connected and fixed with the basin frame 1.

Optionally, the outer washer 232 and the basin frame 1 can be connected by welding, bonding or integral molding, which is not limited here. In this embodiment, as shown in Figures 1 to 5, a limiting protrusion 2321 is provided on the side of the outer washer 232 facing away from the magnetic gap 24. The basin frame 1 is provided with a limiting groove 12, and the limiting protrusion 2321 accommodates And is limited in the limiting groove 12. It can be understood that such an arrangement can improve the connection stability between the basin frame 1 and the external magnetic circuit part 23 and realize the limited installation of the magnetic circuit system 2 .

In one embodiment, as shown in FIGS. 1 to 4 , a recessed groove 2222 is provided on the side of the inner wall 222 facing away from the inner magnet 221 .

In this embodiment, a notch groove 2221 is provided on the side of the inner magnet 222 facing the magnetic gap 24, 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 24, 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 FIGS. 6 to 8 , the notch groove 2221 and the recessed groove 2222 of the inner valve 222 of the present invention cooperate to remove the inner valve. The low magnetic permeability part of 222 can increase the magnetic flux density of Nehuas 222. This can effectively reduce the weight of Nehuas 222 and improve the use efficiency of Nehuas 222 while ensuring the magnetic flux. The BL curve is more symmetrical, the force received by the voice coil 32 during the reciprocating vibration is more balanced, and the vibration state is more stable.

It can be understood that in order to ensure that the voice coil 32 of the vibration system 3 can maintain the maximum displacement of a constant number of voice coils located in the magnetic gap 23 when cutting the magnetic field lines in the magnetic gap 24, the voice coil 32 adopts a long voice coil. , and combined with the stepped Nehua Division 222, the Nehua Division 222 is in a stepped shape adjacent to the magnetic gap 24, which can increase the magnetic flux density at the magnetic gap 24 and ensure that the sound-generating device 100 has higher sensitivity while ensuring BL value, the linear range of the sound-generating device 100 is increased.

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 24 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 24 , 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 24 is arranged in a stepped manner. It can be understood that the recessed groove 2222 may be a semicircular groove or a hemispherical groove. The connection between the groove wall of the recessed groove 2222 and the side surface of the Nehua 222 facing away from the inner magnet 221 is provided with a rounded corner or an arc-shaped transition, so that the airflow generated by the vibration of the diaphragm 31 can flow more smoothly.

Optionally, the inner wall of the recessed groove 2222 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 to the outer wall of the inner washboard 222 .

In this embodiment, as shown in FIGS. 1 to 4 , the inner wall of the recessed groove 2222 is configured as a connected convex arc surface and a concave arc surface, so that the convex arc surface is located at the edge of the concave arc surface and is connected with the inner wall. The outer walls of the washers 222 are connected to ensure that the upper end of the washers 222 is arranged in a smooth transition to uniformize the magnetic flux lines and further increase the magnetic flux density at the magnetic gap 24 . Optionally, the connection between the convex arc surface and the concave arc surface is provided with a smooth transition, that is, the inner wall of the recessed groove 2222 has a smooth arc structure, thereby making the air flow generated by the vibration of the diaphragm 31 smoother and reducing air flow impact. Interference caused by magnetic circuit system 2.

In one embodiment, the thickness of the inner magnet 221 is defined as h1, and the thickness of the outer magnet 231 is defined as h2, where 0.8≤h1/h2≤1.2. It can be understood that, as shown in Figures 3 and 4, the thickness h1 of the inner magnet 221 is the thickness of the inner magnet 221 along the movement direction of the voice coil 32 or the vibration direction of the diaphragm 31, and the thickness h2 of the outer magnet 231 is the thickness of the outer magnet 231 along the sound direction. The thickness in the moving direction of the ring 32 or the vibration direction of the diaphragm 31.

In this embodiment, by controlling the ratio of the thickness h1 of the inner magnet 221 to the thickness h2 of the outer magnet 231 in the range of 0.8 to 1.2, the magnetic field distribution of the magnetic circuit system 2 is made more uniform, within the limited space and cost range. , to maximize the magnetic field strength. Optionally, the ratio of the thickness h1 of the inner magnet 221 to the thickness h2 of the outer magnet 231 is 0.8, 0.9, 1, 1.1, 1.2, etc., which is not limited here.

In one embodiment, the maximum thickness of the inner washers 222 is defined as t1, and the thickness of the outer washers 232 is defined as t2, where 2≤t1/t2≤2.5. It can be understood that, as shown in FIGS. 3 and 4 , the maximum thickness t1 of the inner tube 222 is the maximum thickness t1 between the side of the inner tube 222 facing away from the inner magnet 221 and the side of the inner tube 222 facing the inner magnet 221 . distance, the thickness of the inner washers 222 is the thickness of the inner washers 222 along the movement direction of the voice coil 32 or the vibration direction of the diaphragm 31, and the thickness t2 of the outer washers 232 is the thickness of the outer washers 232 along the movement direction of the voice coil 32 or the vibration direction of the diaphragm 31. thickness in the vibration direction.

In this embodiment, by controlling the ratio of the maximum thickness t1 of the inner and outer washers 222 to the thickness t2 of the outer washers 232 in the range of 2 to 2.5, the magnetic field distribution of the magnetic circuit system 2 is more uniform, and in a limited space and Maximize the magnetic field strength within the cost range. Optionally, the ratio of the maximum thickness t1 of the inner member 222 to the thickness t2 of the outer member 232 is 2, 2.1, 2.2, 2.3, 2.4, 2.5, etc., which is not limited here.

In one embodiment, as shown in Figures 3 and 4, the radius of the inner washboard 222 is defined as d1, and the width of the outer washstand 232 is defined as d2, where 1.5≤d1/d2≤2. It can be understood that the inner valve 222 can be a disk structure, the radius d1 of the inner valve 222 is the radius of a side surface of the inner valve 222 facing away from the inner magnet 221, and the outer valve 232 can be a circular ring structure.

In this embodiment, by controlling the ratio of the radius d1 of the inner valve 222 to the width d2 of the outer valve 232 in the range of 1.5 to 2, the magnetic field distribution of the magnetic circuit system 2 is more uniform, and the magnetic field distribution in the limited space is more uniform. Maximize the magnetic field strength within the range of cost and cost. Optionally, the ratio of the radius d1 of the inner wall 222 to the width d2 of the outer wall 232 is 1.5, 1.6, 1.7, 1.8, 1.9, 2, etc., which is not limited here.

In one embodiment, as shown in FIGS. 1 to 4 , the cross-section of the recessed groove 2222 is semicircular, the radius of the recessed groove 2222 is defined as R, the maximum thickness of the inner wall 222 is defined as t1, and the inner wall 222 is defined as The radius of is d1, where t1＜R＜d1.

In this embodiment, the inner tube 222 is cut from the middle of the inner tube 222 along the moving direction of the voice coil 32 or the vibration direction of the diaphragm 31 . The cross section of the recessed groove 2222 is semicircular. By changing the radius R of the recessed groove 2222 It is limited between the maximum thickness t1 of the Nehua Division 222 and the radius d1 of the Nehua Division 222, from The length of the inner wall 222 adjacent to the outer wall of the magnetic gap 24 is ensured to ensure the magnetic flux density of the inner wall 222 at the magnetic gap 24 .

In one embodiment, the inner magnetic circuit part 22 also includes a short-circuit ring 223. The short-circuit ring 223 includes a first section 2231 and a second section 2232 arranged at an angle. The first section 2231 and the inner magnet 222 face away from the inner magnet 221. The second section 2232 is attached to the side of the inner magnet 222 facing the magnetic gap 24 and extends to the inner magnet 221 to cover the notch groove 2221 .

In this embodiment, as shown in FIGS. 1 to 4 , a short-circuit ring 223 is provided to effectively reduce the reverse electromotive force of the voice coil 32 in the magnetic gap 24 , thereby reducing inductance and improving high-frequency sensitivity. . Optionally, the short-circuit ring 223 is made of copper.

It can be understood that the short-circuit ring 223 has an annular cylindrical structure. As shown in FIGS. 1 to 4 , the short-circuit ring 223 includes a first section 2231 and a second section 2232 arranged at an angle. Optionally, the first section 2231 and the second section 2232 are arranged vertically. The first section 2231 is connected to the side of the inner wall 222 facing away from the inner magnet 221, and the first section 2231 is provided with an opening corresponding to the recessed groove 2222, that is, the recessed groove 2222 is exposed in the opening. The second section 2232 is attached to the side of the internal magnet 222 facing the magnetic gap 24 and extends to the inner magnet 221 to cover the notch 2221 .

In one embodiment, as shown in FIG. 4 , the length of the notch groove 2221 along the axis of the magnetic gap 24 is defined as a, and the length of the notch groove 2221 along the direction perpendicular to the axis of the magnetic gap 24 is defined as b; where, 1.8≤a/ b≤2.2.

In this embodiment, the axial direction of the magnetic gap 24 is the moving direction of the voice coil 32 , and the axial direction perpendicular to the magnetic gap 24 is the direction from the inner magnetic circuit part 22 to the side wall of the U-iron 21 accommodating groove 211 . By providing a notch groove 2221 on the side of the inner magnetic circuit part 22 facing the magnetic gap 24, the length of the notch groove 2221 along the axis of the magnetic gap 24 is defined as a, and the length of the notch groove 2221 along the direction perpendicular to the axis of the magnetic gap 24 is defined as b, so that the ratio of the length a of the notch groove 2221 along the axis direction of the magnetic gap 24 to the length b of the notch groove 2221 along the direction perpendicular to the axis of the magnetic gap 24 is in the range of 1.8 to 2.2, so that by setting it on the inner magnetic circuit part 22 The notch groove 2221 is used to cancel 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 high magnetic permeability part of the inner magnetic circuit part 22 can be fully utilized to ensure that the sound-generating device 100 is in good condition While having a high BL value and linear range, it can also meet the design requirements of miniaturization and lightweight.

Optionally, the ratio of the length a of the notch groove 2221 along the axis direction of the magnetic gap 24 to the length b of the notch groove 2221 along the direction perpendicular to the axis of the magnetic gap 24 is 1.8, 1.9, 2, 2.1, 2.2, etc., and is not used here. Make limitations.

In one embodiment, a boss 213 protrudes from the bottom wall of the accommodating groove 211. The boss 213 is spaced apart from the side walls of the accommodating groove 211 and encloses a relief groove 214 that communicates with the accommodating groove 211. The groove 214 corresponds to the magnetic gap 24 , and the inner magnetic circuit part 22 is supported on the boss 213 .

In this embodiment, as shown in FIGS. 1 to 5 , a boss 213 is provided on the bottom wall of the accommodating groove 211 of the U iron 21 so that the boss 213 is spaced apart from the side walls of the accommodating groove 211 to form an enclosure. The relief groove 214 is connected with the magnetic gap 24 correspondingly, so that while the boss 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 24. , to ensure the amplitude of the sound-generating device 100.

It can be understood that the boss 213 may be a protruding structure protruding from the bottom wall of the accommodating groove 211 . Of course, the boss 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, a groove 215 is recessed on the side of the U iron 21 facing away from the notch of the accommodating groove 211. That is, the groove 215 is formed on the side of the U iron 21 facing away from the bottom wall of the accommodating groove 211 corresponding to the boss 213. .

In this embodiment, in order to ensure the air pressure balance in the vibration space when the voice coil 32 drives the diaphragm 31 to vibrate, a through hole is provided on the frame 1 and communicates with the vibration space. Of course, a through-hole structure corresponding to the through-hole may also be provided on the inner magnetic circuit part 22 . Optionally, the through hole is opened in the bottom wall of the cavity 11 of the basin frame 1 and penetrates the bottom wall of the cavity 11 .

In one embodiment, as shown in Figure 1, 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 basin frame 1 is protrudingly provided with a fixing platform 13. The centering ring 33 The outer side is connected with 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.

In one embodiment, as shown in FIGS. 1 to 5 , the U iron 21 extends adjacent to the support surface 212 toward the side away from the accommodating groove 211 to form a support platform 216 . The support platform 216 is flush with the support surface 212 , and the external magnetic circuit The portion 23 is supported on the support surface 212 and the support platform 216 . It can be understood that by providing the support platform 216, the support platform 216 and the support surface 212 are used to increase the contact area with the external magnetic circuit part 23, so as to improve the connection stability between the external magnetic circuit part 23 and the U-iron 21.

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 open at both ends;

Magnetic circuit system, the magnetic circuit system includes a U iron, an inner magnetic circuit part and an outer magnetic circuit part, the U iron has a receiving slot, the inner magnetic circuit part is arranged in the receiving slot, the U iron The end surface of the iron adjacent to the notch of the accommodating groove forms a supporting surface. The external magnetic circuit part is provided on the supporting surface and is connected to the basin frame. The external magnetic circuit part cooperates with the U iron to cover The opening of one end of the cavity is closed, the side wall of the accommodation groove and the outer magnetic circuit part are spaced apart from the inner magnetic circuit part to form a magnetic gap, and the inner magnetic circuit part faces one side of the magnetic gap. Notched slots are provided on the sides; and

Vibration system, the vibration system includes a diaphragm and a voice coil connected to the diaphragm. The diaphragm is connected to the basin frame and covers the opening at the other end of the cavity. The voice coil is away from the One end of the diaphragm is suspended in the magnetic gap.
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 notch groove is provided on the side of the Newas facing the magnetic gap;

The outer magnetic circuit part includes stacked outer magnets and outer washers. The outer magnets are sandwiched between the outer washers and the support surface. The outer washers are connected to the basin frame.
The sound-generating device according to claim 2, characterized in that a recessed groove is provided on the side of the Newas facing away from the inner magnet.
The sound-generating device according to claim 3, wherein the thickness of the inner magnet is defined as h1, and the thickness of the outer magnet is defined as h2, where 0.8≤h1/h2≤1.2;

And/or, define the maximum thickness of the inner washboard as t1, and define the thickness of the outer washboard as t2, where 2≤t1/t2≤2.5;

And/or, define the radius of the inner wall as d1, and define the width of the outer wall as d2, where 1.5≤d1/d2≤2;

And/or, the cross section of the recessed groove is semicircular, the radius of the recessed groove is defined as R, the maximum thickness of the inner wall is defined as t1, and the radius of the inner wall is defined as d1, where, t1＜R＜d1.
The sound-generating device according to claim 3, wherein the notch groove extends along the periphery of the inner wall;

And/or, the notch groove is provided adjacent to the inner magnet;

And/or, the outer washer is provided with a limiting protrusion on a side facing away from the magnetic gap, the basin is provided with a limiting groove, and the limiting protrusion is accommodated and limited in the limiting groove.
The sound-generating device according to claim 2, characterized in that the inner magnetic circuit part further includes a short-circuit ring, the short-circuit ring includes a first section and a second section arranged at an angle, the first section and the The inner valve is connected to the side facing away from the inner magnet, and the second section is attached to the side of the inner valve facing the magnetic gap and extends to the inner magnet to cover the gap. groove.
The sound-generating device according to any one of claims 1 to 6, characterized in that the length of the notch groove along the axis of the magnetic gap is defined as a, and the length of the notch groove along the axis of the magnetic gap is defined as perpendicular to the axis of the magnetic gap. The length of the direction is b; among them, 1.8≤a/b≤2.2.
The sound-generating device according to any one of claims 1 to 6, characterized in that a boss is protruding from the bottom wall of the accommodating groove, and the boss is spaced from the side wall of the accommodating groove, and Enclosing and forming a relief groove connected to the accommodation groove, the relief groove corresponds to the magnetic gap, and the inner magnetic circuit is partially supported on the boss;

And/or, a groove is recessed on the side of the U-iron back toward the opening of the accommodating groove.
The sound-generating device according to any one of claims 1 to 6, 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 basin frame A fixed platform is provided on the protrusion, and the outer side of the centering ring is connected to the fixed platform;

And/or, the U iron extends adjacent to the supporting surface toward a side away from the accommodating groove to form a supporting platform, the supporting platform is flush with the supporting surface, and the external magnetic circuit part is supported on the support surface and said support 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.