CN115103279A - Sound production device and terminal equipment - Google Patents

Abstract

The invention discloses a sound generating device and terminal equipment, the sound generating device comprises a basin frame, a magnetic circuit system and a vibration system, the magnetic circuit system comprises a U-shaped iron, an inner magnetic circuit part and an outer magnetic circuit part, the inner magnetic circuit part is arranged in an accommodating groove of the U-shaped iron, the outer magnetic circuit part is arranged on a supporting surface of the U-shaped iron and is connected with the basin frame, the outer magnetic circuit part is matched with the U-shaped iron to cover an opening at one end of an accommodating cavity, the side wall of the accommodating groove and the outer magnetic circuit part are separated from the inner magnetic circuit part to form a magnetic gap, a notch groove is formed in one side of the inner magnetic circuit part facing the magnetic gap, the vibration system comprises a vibrating diaphragm and a voice coil connected to the vibrating diaphragm, the vibrating diaphragm is connected with the basin frame and covers the opening at the other end of the accommodating cavity, and one end, far away from the vibrating diaphragm, is suspended in the magnetic gap. The invention aims to provide a sound generating device which ensures a good BL value and a good linear range, not only effectively reduces the weight and ensures the good BL value and the good linear range, but also can meet the design requirements of miniaturization and light weight.

Description

Sound generators and terminal equipment

technical field

The present invention relates to the technical field of electro-acoustic conversion, and in particular, to a sounding device and a terminal device applying the sounding device.

Background technique

A horn, also known as a speaker, is an electro-acoustic transducer that converts electrical energy into sound energy through some physical effect. When different electronic energy is 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 action will change the density of the air to produce sound.

In the related art, the washer of the loudspeaker is mostly cylindrical or annular, which is bonded to the magnet through glue, and forms a magnetic circuit system of the loudspeaker with U iron or T iron. The washer acts as a magnetic conductor, forming a magnetic circuit with U iron or T iron and a magnet, so that the energized voice coil cuts the magnetic field line in it, and drives the diaphragm to vibrate and sound. However, the magnetic permeability of the disk-shaped or ring-shaped washer is very low. Retaining the area with low magnetic permeability leads to an increase in the weight of the washer, which cannot meet the design requirements of miniaturization and light weight, and there are differences in BL value and linear range. good question.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide a sounding device and terminal equipment, aiming to provide a sounding device that ensures good BL value and linear range, the sounding device not only effectively reduces weight, while ensuring good BL value and linear range, It can also meet the design requirements of miniaturization and light weight.

In order to achieve the above-mentioned purpose, the present invention proposes a sounding device, the sounding device includes:

a basin frame, the basin frame is provided with a cavity open at both ends;

A 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 an accommodating groove, the inner magnetic circuit part is arranged in the accommodating groove, the U iron The end face of the iron adjacent to the notch of the accommodating slot forms a supporting surface, the outer magnetic circuit part is arranged on the supporting surface, and is connected with the basin frame, and the outer magnetic circuit part and the U iron cooperate to cover the The opening at one end of the cavity is closed, the side wall of the accommodating slot and the outer magnetic circuit portion are spaced apart from the inner magnetic circuit portion to form a magnetic gap, and the inner magnetic circuit portion faces one side of the magnetic gap. provided with notched grooves on the sides; and

A vibration system, the vibration system includes a vibration membrane and a voice coil connected to the vibration membrane, the vibration membrane is connected to the basin frame and covers the opening at the other end of the cavity, and the voice coil is far away from the One end of the diaphragm is suspended in the magnetic gap.

In one embodiment, the inner magnetic circuit part includes an inner magnet and an inner magnet arranged in layers, the inner magnet is sandwiched between the inner magnet and the bottom wall of the accommodating slot, and the inner magnet is sandwiched between the inner magnet and the bottom wall of the accommodating groove. The side of the washer facing the magnetic gap is provided with the notch groove;

The outer magnetic circuit part includes a stacked outer magnet and an outer washer, the outer magnet is sandwiched between the outer washer and the support surface, and the outer washer is connected to the basin frame.

In one embodiment, a concave groove is provided on the side of the Nevada 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, wherein 0.8≤h1/h2≤1.2;

And/or, the maximum thickness of the inner wall is defined as t1, and the thickness of the outer wall is defined 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 concave groove is a semicircle, the radius of the concave 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, wherein, t1<R<d1.

In one embodiment, the notched groove is extended along the periphery of the Nevada;

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

And/or, the side of the Waihuasi facing away from the magnetic gap is protruded with a limiting protrusion, the basin frame is provided with a limiting groove, and the limiting protrusion is accommodated and limited in the limiting groove.

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

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

In one embodiment, the bottom wall of the accommodating groove is protruded with a boss, the boss is spaced from the side wall of the accommodating groove, and encloses an escape 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 facing away from the notch of the accommodating slot.

In one embodiment, the vibration system further includes a centering ring, the inner side of the centering ring is connected with the outer wall of the voice coil, the basin frame is protruded with a fixing table, and the outer side of the centering ring is connected to the outer wall of the voice coil. the fixed platform is connected;

And/or, the U iron is adjacent to the support surface and extends toward the side away from the accommodating slot to form a support platform, the support platform is flush with the support surface, and the outer magnetic circuit is partially supported on the a support surface and the support table.

The present invention also provides a terminal device, comprising a device housing and the above-mentioned sounding device, wherein the sounding device is provided in the device housing.

The sound generating device according to the technical solution of the present invention uses the basin frame to install, fix and protect the magnetic circuit system and the vibration system by arranging cavities with openings at both ends in the basin frame. And the outer magnetic circuit part, use the accommodating groove of the U iron 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 and the side wall of the accommodating groove of the U iron are in contact with each other. The outer magnetic circuit is partially enclosed to form a magnetic gap for the voice coil of the vibration system to be suspended. After the voice coil is energized, the voice coil cuts the magnetic field lines in the magnetic gap of the magnetic circuit system, thereby driving the diaphragm to vibrate and sound; The side of the inner magnetic circuit part facing the magnetic gap is provided with a notch slot, so that the part with low magnetic permeability of the inner magnetic circuit part is eliminated, so as to reduce the weight of the inner magnetic circuit part and make full use of the part of the inner magnetic circuit part with high magnetic permeability , in order to ensure a good BL value and linear range of the sound device, and also meet the design requirements of miniaturization and light weight.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained according to the structures shown in these drawings without creative efforts.

FIG. 1 is a schematic cross-sectional view of a sounding device according to an embodiment of the present invention;

2 is a schematic cross-sectional view of a magnetic circuit system in an embodiment of the present invention;

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

4 is an enlarged schematic partial cross-sectional view of a magnetic circuit system in an embodiment of the present invention;

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

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

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

FIG. 8 is a BL curve diagram of a sound generating device according to an embodiment of the present invention and the prior art.

Description of reference numbers:

label name label name 100 sound device 222 Nevada 1 pot stand 2221 Notched groove 11 Cavity 2222 recessed groove 12 Limit slot 223 short circuit 13 Fixed table 2231 first paragraph 2 Magnetic circuit system 2232 second paragraph twenty one U iron twenty three External magnetic circuit part 211 accommodating slot 231 outer magnet 212 support surface 232 Waihuasi 213 boss 2321 Limit protrusion 214 escape slot twenty four Magnetic gap 215 groove 3 Vibration system 216 support table 31 Diaphragm twenty two Internal magnetic circuit part 32 voice coil 221 inner magnet 33 centering ring

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

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 a part of the embodiments of the present invention, not 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 creative efforts shall fall within the protection scope of the present invention.

It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relationship between various components under a certain posture (as shown in the accompanying drawings). The relative positional relationship, the movement situation, etc., if the specific posture changes, the directional indication also changes accordingly.

At the same time, the meaning of "and/or" or "and/or" in the whole text is that it includes three schemes, taking "A and/or B" as an example, including scheme A, scheme B, or scheme A and B at the same time satisfied program.

In addition, descriptions such as "first", "second", etc. in the present invention are only for descriptive purposes, and should not be construed as indicating or implying their relative importance or implicitly indicating the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In addition, the technical solutions between the various embodiments can be combined with each other, but 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 the combination of such technical solutions does not exist. , is not within the scope of protection required by the present invention.

A horn, also known as a speaker, is an electro-acoustic transducer that converts electrical energy into sound energy through some physical effect. When different electronic energy is 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 action will change the density of the air to produce sound.

In the related art, the washer of the loudspeaker is mostly cylindrical or annular, which is bonded to the magnet through glue, and forms a magnetic circuit system of the loudspeaker with U iron or T iron. The washer acts as a magnetic conductor, forming a magnetic circuit with U iron or T iron and a magnet, so that the energized voice coil cuts the magnetic field line in it, and drives the diaphragm to vibrate and sound. However, the magnetic permeability of the disk-shaped or ring-shaped washer is very low. Retaining the area with low magnetic permeability leads to an increase in the weight of the washer, which cannot meet the design requirements of miniaturization and light weight, and there are differences in BL value and linear range. good question.

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

Please refer to FIGS. 1 to 5 , in an 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 , wherein the basin frame 1 is provided with a cavity 11 with two ends open. , 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 groove 211, the inner magnetic circuit part 22 is arranged in the accommodating groove 211, and the U iron 21 is adjacent to the accommodation The end face of the notch of the slot 211 forms a support surface 212. The outer magnetic circuit part 23 is arranged on the support surface 212 and is connected with the basin frame 1. The side wall of the slot 211 and the outer magnetic circuit portion 23 are spaced 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 slot 2221. The vibration system 3 includes a diaphragm 31 And the voice coil 32 connected to the diaphragm 31 , the diaphragm 31 is connected to the basin frame 1 and covers the opening of the other end of the cavity 11 , and the end of the voice coil 32 away from the diaphragm 31 is suspended in the magnetic gap 24 .

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

It can be understood that the basin frame 1 can be optionally cylindrical, square or trumpet-shaped. The cavity 11 of the basin frame 1 can be a cavity structure with one end open, and of course also a cavity structure with two ends open. Optionally, the basin frame 1 is a trumpet-shaped or basin-shaped structure with both ends open. In this embodiment, the basin frame 1 is a columnar or basin-shaped structure with openings at both ends, and the magnetic circuit system 2 is arranged at the opening of one end of the basin frame 1 . One end is connected and fixed, and the other end is closed, so that the diaphragm 31 is opposite to the magnetic circuit system 2 and is enclosed with the basin frame 1 to form a 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 slot 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 communicated with the accommodating cavity 11, the notch of the accommodating groove 211 is opposite to the diaphragm 31, and the U iron 21 is adjacent to the notch of the accommodating groove 211. The end face forms a support surface 212, the outer magnetic circuit part 23 is arranged on the supporting surface 212 and is connected to the basin frame 1, and the inner magnetic circuit part 22 is arranged in the accommodating groove 211, so that the side wall of the accommodating groove 211 and the outer magnetic circuit part 23 is spaced 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 electrical energy into the magnetic gap 24 of the magnetic circuit system 2, and under the action of the magnetic field of the magnetic circuit system 2, the voice coil 32 is driven to cut the magnetic field line to run, In this way, the electrical energy is converted into mechanical energy, and when the voice coil 32 moves, the diaphragm 32 is driven to vibrate, so that the diaphragm 32 vibrates and emits sound, thus converting the mechanical energy into sound energy to realize electro-acoustic conversion.

It can be understood that when the basin frame 1 is a metal part, the magnetic circuit system 2 and the basin frame 1 are fixed by bonding or welding, so as to improve the heat dissipation effect of the sound generating device 100 . In another embodiment, when the basin frame 1 is plastic injection molding, the magnetic conductive plate of the outer magnetic circuit part 23 of the magnetic circuit system 2 can also be injected into the basin frame 1 as an insert, or the magnetic circuit system 2 and the basin frame 1 It is fixed by adhesive, and then other parts are fixed by adhesive, which is not limited here.

In this embodiment, the inner magnetic circuit part 22 is arranged in the accommodating groove 211, which can reduce the longitudinal space of the sounding device 100, reduce the height of the product, can be used in a narrower space, realize the miniaturization of the product, and at the same time Compared with the traditional design, this structure avoids the interference of the diaphragm 31 with the magnetic circuit system 2 when working with a large amplitude. At the same time, an outer magnetic circuit portion 23 is provided on the support surface 212 formed by the end face of the U iron 21 adjacent to the notch of the accommodating groove 211, thereby further increasing the magnetic field strength.

In this embodiment, as shown in FIGS. 1 to 4 , the outer magnetic circuit portion 23 is fixed on the end face of the U iron 21 , and the inner magnetic circuit portion 22 is arranged in the accommodating groove 211 of the U iron 21 . The magnetic circuit portion 22 , the outer magnetic circuit portion 23 and the U iron 21 increase the magnetic field strength and magnetic flux density, so as to increase the driving force for the voice coil 32 . At the same time, the side of the inner magnetic circuit portion 22 facing the magnetic gap 24 is provided with a notch groove 2221, so that the notch groove 2221 is provided on the inner magnetic circuit portion 22 to cancel the part with low magnetic permeability on the inner magnetic circuit portion 22, thereby The weight of the inner magnetic circuit portion 22 is reduced, so that the high magnetic permeability portion of the inner magnetic circuit portion 22 can be fully utilized to ensure the sound emitting device 100 has a good BL value and linear range, and can also meet the design of miniaturization and light weight. 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 setting the cavity 11 with both ends open in the basin frame 1, and by setting 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 by using the accommodating 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 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. After the voice coil 32 is energized, the voice coil 32 In the magnetic gap 24 of the magnetic circuit system 2, the movement of cutting the magnetic field lines is performed, thereby driving the vibrating film 31 to vibrate and sound; the side of the inner magnetic circuit part 22 facing the magnetic gap 24 is provided with a notch slot 2221, thereby canceling the inner magnetic In order to reduce the weight of the inner magnetic circuit part 22, and make full use of the part with high magnetic permeability of the inner magnetic circuit part 22, to ensure the sound emitting device 100 good BL value and linear range, it also It can meet the design requirements of miniaturization and light weight.

In one embodiment, the inner magnetic circuit part 22 includes an inner magnet 221 and an inner magnet 222 arranged in layers, the inner magnet 221 is sandwiched between the inner magnet 222 and the bottom wall of the accommodating slot 211, and the inner magnet 222 faces the inner magnet 222. One side of the magnetic gap 24 is provided with a notch slot 2221; the outer magnetic circuit part 23 includes an outer magnet 231 and an outer washer 232 arranged in layers, and the outer magnet 231 is sandwiched between the outer washer 232 and the supporting surface 212. 232 is connected to the basin frame 1.

In this embodiment, as shown in FIG. 1 to FIG. 4 , the inner magnetic circuit part 22 includes an inner magnet 221 and an inner magnet 222 . The inner magnet 221 can be selected as a magnet, and the inner magnet 222 can be selected as a magnetic conductive plate structure. The shape outline of the inner magnet 221 is the same as or the same as the shape outline of the inner magnet 222 . Optionally, the inner magnet 221 and the inner magnet 222 may be circular, oval, square, or racetrack shape, etc., which are not limited herein. 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 selected as a magnet, and the outer washer 232 can be selected as a magnetic conductive plate structure. The shape outline of the outer magnet 231 is the same as or the same as that of the outer washer 232 . Optionally, the outer magnet 231 and the outer washer 232 may be of circular ring, elliptical ring, square ring or racetrack ring shape, etc., which are not limited herein.

It can be understood that the shape and outline of the inner magnet 221 and the inner washer 222 of the inner magnetic circuit part 22 are roughly similar to the shape and outline of the accommodating slot 211 of the U iron 21. The outer magnet 231 and the outer washer 232 of the outer magnetic circuit part 23 have The shape outline is roughly similar to the shape 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, and the outer magnetic circuit part 23 passes through the outer washer. 232 is connected and fixed with the basin frame 1 .

Optionally, the Waihuasi 232 and the basin frame 1 may be connected by welding, bonding or integral molding, which is not limited herein. In this embodiment, as shown in FIG. 1 to FIG. 5 , a limiting protrusion 2321 is protruded from the side of the foreign 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 limited in the limit groove 12 . It can be understood that this arrangement can improve the connection stability between the basin frame 1 and the outer magnetic circuit part 23 , and realize the limit installation of the magnetic circuit system 2 .

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

In the present embodiment, a notch groove 2221 is provided on the side of the inner part 222 facing the magnetic gap 24, and a concave groove 2222 is provided on the side of the inner part 222 facing away from the inner magnet 221, so that the inner part 222 is provided with a recessed groove 2222. 222 forms a stepped structure, so that the notch groove 2221 and the concave groove 2222 are used to further cooperate to cancel the part with low magnetic permeability on the Nevada 222, so as to reduce the weight of the Nevada 222, achieve the purpose of weight reduction, and ensure that the Nevada 222 is in the Magnetic permeability and magnetic field strength under the action of the inner magnet 221 .

In this embodiment, the notch groove 2221 may be a notch, a groove, or the like. The recessed groove 2222 can be optionally a groove structure or a through-groove structure, etc., which is not limited herein. The recessed groove 2222 is formed by a side of the Nevada 222 facing away from the inner magnet 221 being recessed toward the inner magnet 221 . Optionally, the recessed slot 2222 is located in the middle of the Nevada 222 .

In order to further increase the magnetic flux density at the magnetic gap 24, the inner wall of the concave groove 2222 is provided with an arc surface, so that the airflow generated by the vibration of the diaphragm 31 flows more smoothly. In this embodiment, as shown in FIG. 6 to FIG. 8 , the notched groove 2221 and the recessed groove 2222 of the Nevada 222 of the present invention cooperate to remove the part with low magnetic permeability on the Nevada 222, so that the magnetic field of the Nevada 222 can be reduced. The flux density is increased, so on the premise of ensuring the magnetic flux, the weight of the Nevada 222 can be effectively reduced, and the use efficiency of the Nevada 222 can be improved, and the BL curve is more symmetrical, and the force of the voice coil 32 is more balanced during the reciprocating vibration. , 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 in the magnetic gap 23 when the voice coil 32 can perform the cutting magnetic field line movement in the magnetic gap 24, the voice coil 32 adopts a long voice coil. , and cooperate with the stepped Nevada 222, so that the Nevada 222 adjacent to the magnetic gap 24 is stepped, which can increase the magnetic flux density at the magnetic gap 24, and ensure that the sounding device 100 has high sensitivity. In the case of a value, the linear range of the sound-emitting device 100 is increased.

Optionally, the notched grooves 2221 extend along the periphery of the inner wall 222 , so that the notched grooves 2221 extend along the circumferential direction of the magnetic gap 24 to form a ring groove structure on the outer sidewall 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 notched slot 2221 is disposed adjacent to the inner magnet 221 .

In this embodiment, the notch groove 2221 penetrates through the bottom surface of the inner magnet 221 facing the inner magnet 221 , so that the outer side wall of the inner magnet 222 facing the magnetic gap 24 is arranged in a stepped manner. It can be understood that the recessed groove 2222 can be optionally a semicircular groove or a hemispherical groove. The junction between the groove wall of the recessed groove 2222 and the side surface of the Nevada 222 facing away from the inner magnet 221 is rounded or arc-shaped, so that the airflow generated by the vibration of the diaphragm 31 can flow more smoothly.

Optionally, the inner wall of the concave groove 2222 includes a connected convex arc surface and a concave arc surface.

In this embodiment, as shown in FIGS. 1 to 4 , the inner wall of the concave 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 to the inner wall of the concave arc surface. The outer side walls of the washer 222 are connected to ensure that the upper end of the inner washer 222 is arranged in a smooth transition, so as to homogenize the magnetic field 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 arranged in a smooth transition, that is, the inner wall of the concave groove 2222 is in a smooth arc structure, so that the airflow generated by the vibration of the diaphragm 31 flows more smoothly and reduces the impact of the airflow. The disturbance caused by the 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, wherein 0.8≤h1/h2≤1.2. It can be understood that, as shown in FIG. 3 and FIG. 4 , the thickness h1 of the inner magnet 221 is the thickness of the inner magnet 221 along the moving 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 of the ring 32 in the moving direction 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 within the range of 0.8-1.2, the magnetic field distribution of the magnetic circuit system 2 is made more uniform, within the scope of limited space and cost. , 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 herein.

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

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

In one embodiment, as shown in FIG. 3 and FIG. 4 , the radius of the inner part 222 is defined as d1, and the width of the outer part 232 is defined as d2, wherein 1.5≤d1/d2≤2. It can be understood that the inner wall 222 can be a disc structure, the radius d1 of the inner wall 222 is the radius of the side surface of the inner wall 222 facing away from the inner magnet 221 , and the outer wall 232 can be a ring structure.

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

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

In this embodiment, the Nevada 222 is cut from the middle of the Nevada 222 along the moving direction of the voice coil 32 or the vibration direction of the diaphragm 31, and the cross section of the recessed groove 2222 is semicircular. It is limited between the maximum thickness t1 of the Nevada 222 and the radius d1 of the Nevada 222, thereby ensuring the length of the Nevada 222 on the outer sidewall adjacent to the magnetic gap 24 to ensure that the Nevada 222 is at the magnetic gap 24. Magnetic flux density.

In one embodiment, the inner magnetic circuit portion 22 further includes a short-circuit ring 223 , and the short-circuit ring 223 includes a first segment 2231 and a second segment 2232 arranged at an included angle, and the first segment 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 part 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 , by setting the short-circuit ring 223 , the short-circuit ring 223 can be used to effectively reduce the back electromotive force of the voice coil 32 in the magnetic gap 24 , so as to reduce the inductance and improve the high-frequency sensitivity. . Optionally, the short-circuit ring 223 is made of copper material.

It can be understood that the short-circuit ring 223 has an annular cylindrical structure. As shown in FIG. 1 to FIG. 4 , the short-circuit ring 223 includes a first segment 2231 and a second segment 2232 arranged at an included angle. Optionally, the first segment 2231 and the second segment 2232 are arranged vertically. The first section 2231 is connected to the side of the Nevada 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 through the opening. The second section 2232 is attached to the side of the Nevada 222 facing the magnetic gap 24 and extends to the inner magnet 221 to cover the notch groove 2221 .

In one embodiment, as shown in FIG. 4 , the length of the notch groove 2221 along the axis direction of the magnetic gap 24 is defined as a, and the length of the notch groove 2221 along the axis direction perpendicular to the magnetic gap 24 is defined as b; wherein, 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 portion 22 to the side wall of the accommodating slot 211 of the U iron 21 . The side of the inner magnetic circuit part 22 facing the magnetic gap 24 is provided with a notch slot 2221, the length of the notch slot 2221 along the axis direction of the magnetic gap 24 is defined as a, and the length of the notch slot 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 direction of the magnetic gap 24 is in the range of 1.8-2.2, so that by setting the inner magnetic circuit part 22 The notch slot 2221 is used to eliminate the part with low magnetic permeability on the inner magnetic circuit part 22, thereby reducing the weight of the inner magnetic circuit part 22, so that the part with high magnetic permeability of the inner magnetic circuit part 22 can be fully utilized to ensure that the sound generating device 100 is good At the same time, it can meet the design requirements of miniaturization and light weight.

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 direction of the magnetic gap 24 is 1.8, 1.9, 2, 2.1, 2.2, etc., which is not limited here. .

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

In this embodiment, as shown in FIG. 1 to FIG. 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 from the side wall of the accommodating groove 211 to form an enclosure. The avoidance groove 214 is connected with the magnetic gap 24, so that the boss 213 is used to support and fix the inner magnetic circuit part 22, and the movement of the voice coil 32 in the magnetic gap 24 is avoided by the use of the avoidance groove 214. , so as 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 may also be formed by a side of the U iron 21 facing away from the bottom wall of the accommodating groove 211 protruding toward the accommodating groove 211 , which is not limited herein. Optionally, the side of the U iron 21 facing away from the notch of the accommodating groove 211 is concavely provided with a groove 215 , that is, the side of the U iron 21 facing away from the bottom wall of the accommodating groove 211 is recessed to form a groove 215 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 basin frame 1, and the through hole communicates with the vibration space. Of course, through-hole structures can also be provided on the inner magnetic circuit portion 22 corresponding to the through-holes. Optionally, the through hole is opened in the bottom wall of the cavity 11 of the basin frame 1 and penetrates through the bottom wall of the cavity 11 .

In one embodiment, as shown in FIG. 1 , the vibration system 3 further includes a centering ring 33 , the inner side of the centering ring 33 is connected with the outer wall of the voice coil 32 , the basin frame 1 is protruded with a fixing table 13 , and the centering ring 33 The outer side is connected to the fixing table 13 . It can be understood that by setting the centering ring 33 , the centering ring 33 can effectively prevent the voice coil 32 from polarizing or swinging left and right during the vibration process, so as to improve the vibration sounding effect of the diaphragm 31 .

It can be understood that the fixing table 13 may be a boss structure formed by protruding from the inner wall of the cavity 11 , or may be a stepped structure formed by the inner wall of the cavity 11 , which is not limited herein.

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

The present invention also provides a terminal device, the terminal device includes a device housing and the above-mentioned sounding device 100, and the sounding device 100 is provided in the device housing. The specific structure of the sounding device 100 refers to the foregoing embodiments. Since the terminal device adopts all the technical solutions of all the foregoing embodiments, it has at least all the beneficial effects brought by the technical solutions of the foregoing embodiments, which will not be described here. Repeat.

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

Claims (10)

1. A sound generating device, the sound generating device comprising:

the basin stand is provided with a containing cavity with two open ends;

the magnetic circuit system comprises a U-shaped iron, an inner magnetic circuit part and an outer magnetic circuit part, wherein the U-shaped iron is provided with an accommodating groove, the inner magnetic circuit part is arranged in the accommodating groove, the end face of the U-shaped iron, which is adjacent to the notch of the accommodating groove, forms a supporting surface, the outer magnetic circuit part is arranged on the supporting surface and is connected with the basin frame, the outer magnetic circuit part is matched with the U-shaped iron to cover an opening at one end of the accommodating groove, the side wall of the accommodating groove and the outer magnetic circuit part are separated from the inner magnetic circuit part to form a magnetic gap, and one side of the inner magnetic circuit part, which faces the magnetic gap, is provided with a notch groove; and

the vibration system comprises a vibrating diaphragm and a voice coil connected to the vibrating diaphragm, the vibrating diaphragm is connected to the basin frame and covers the opening at the other end of the accommodating cavity, and the voice coil is far away from one end of the vibrating diaphragm and is suspended in the magnetic gap.

2. The sound production device according to claim 1, wherein the inner magnetic path portion comprises an inner magnet and an inner washer which are stacked, the inner magnet is clamped between the inner washer and the bottom wall of the containing groove, and the notched groove is formed in one side of the inner washer facing the magnetic gap;

the outer magnet circuit part comprises an outer magnet and an outer washer which are arranged in a stacked mode, the outer magnet is clamped between the outer washer and the supporting surface, and the outer washer is connected with the basin stand.

3. The sound production device as claimed in claim 2, wherein a concave groove is formed in a side of the inner washer facing away from the inner magnet.

4. The sound production device according to claim 3, wherein the thickness of the inner magnet is defined as h1, the thickness of the outer magnet is defined as h2, wherein 0.8 ≦ h1/h2 ≦ 1.2;

and/or defining the maximum thickness of the inner washer as t1 and the thickness of the outer washer as t2, wherein t1/t2 is more than or equal to 2.5;

and/or the radius of the inner washer is defined as d1, the width of the outer washer is defined as d2, wherein d1/d2 is more than or equal to 1.5 and less than or equal to 2;

and/or the cross section of the concave groove is semicircular, the radius of the concave groove is defined as R, the maximum thickness of the inner washer is defined as t1, the radius of the inner washer is defined as d1, and t1 is greater than R and is less than d 1.

5. The sound generator of claim 3, wherein the notched groove extends along a periphery of the inner washer;

and/or the notch groove is arranged adjacent to the inner magnet;

and/or, one side of the outer washer back to the magnetic gap is convexly provided with a limiting bulge, the basin frame is provided with a limiting groove, and the limiting bulge is accommodated and limited in the limiting groove.

6. The sound generating device according to claim 2, wherein the inner magnetic circuit further comprises a short circuit ring, the short circuit ring comprises a first section and a second section which are arranged at an included angle, the first section is connected with one side of the inner washer, which faces away from the inner magnet, the second section is attached to one side of the inner washer, which faces the magnetic gap, and extends to the inner magnet to cover the notch groove.

7. The sound generating apparatus according to any one of claims 1 to 6, wherein a length of the cutaway groove in the magnetic gap axis direction is defined as a, and a length of the cutaway groove in a direction perpendicular to the magnetic gap axis direction is defined as b; wherein, a/b is more than or equal to 1.8 and less than or equal to 2.2.

8. The sounding device according to any one of claims 1 to 6, wherein a boss is convexly provided on a bottom wall of the receiving groove, the boss is spaced from a side wall of the receiving groove and encloses a receiving groove communicating with the receiving groove, the receiving groove corresponds to the magnetic gap, and the inner magnetic path portion is supported by the boss;

and/or a groove is concavely arranged on one side of the U-shaped iron, which is back to the notch of the accommodating groove.

9. The sounding device according to any one of claims 1 to 6, wherein the vibration system further comprises a centering ring, an inner side of the centering ring is connected with an outer wall of the voice coil, the frame is convexly provided with a fixed platform, and an outer side of the centering ring is connected with the fixed platform;

and/or the U-shaped iron is adjacent to the supporting surface and extends towards one side departing from the accommodating groove to form a supporting platform, the supporting platform is flush with the supporting surface, and the outer magnetic circuit part is supported on the supporting surface and the supporting platform.

10. A terminal device, comprising a device housing and a sound generating device according to any one of claims 1 to 9, said sound generating device being provided in said device housing.

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