WO2022166379A1

WO2022166379A1 - Sound producing unit

Info

Publication number: WO2022166379A1
Application number: PCT/CN2021/136290
Authority: WO
Inventors: 王苗苗; 郭晓冬
Original assignee: 歌尔股份有限公司
Priority date: 2021-02-02
Filing date: 2021-12-08
Publication date: 2022-08-11
Also published as: CN112770237A; CN112770237B

Abstract

Disclosed is a sound producing unit, comprising a housing having an accommodating space, and a magnetic conductive diaphragm and two magnetic circuit systems which are arranged in the accommodating space, wherein the two magnetic circuit systems are arranged opposite and spaced apart from each other, an edge of the magnetic conductive diaphragm is fixed to the housing so as to be suspended between the two magnetic circuit systems, and the magnetic conductive diaphragm is used for vibrating to produce sound under the action of an alternating electromagnetic field generated by the magnetic circuit systems. The sound producing unit disclosed in the present invention is convenient to assemble and has a high electroacoustic conversion efficiency.

Description

sounding unit

technical field

The invention relates to the technical field of electro-acoustic conversion, in particular to a sound-generating monomer.

Background technique

Micro-speakers are often required to be installed in existing electronic devices, and most of the existing micro-speakers are energized through the voice coil, so that the voice coil moves in the gap, so that the voice coil drives the diaphragm to vibrate. During the vibrating and sounding process of the diaphragm, the voice coil and the diaphragm move together, resulting in large vibration quality, poor high-frequency sound quality, and low electro-acoustic conversion efficiency.

Therefore, it is necessary to provide a new type of sound-generating monomer to solve the above technical problems.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide a sound-generating unit, which aims to solve at least one technical problem in the existing speaker structure.

In order to achieve the above-mentioned purpose, the sound-generating unit provided by the present invention includes a housing with an accommodation space, a magnetic conductive diaphragm and two magnetic circuit systems arranged in the accommodation space, and the two magnetic circuit systems are relatively spaced apart. set, the edge of the magnetic conductive diaphragm is fixed with the casing to be suspended between the two magnetic circuit systems, and the magnetic conductive diaphragm is used to act on the alternating electromagnetic field generated by the magnetic circuit system vibrate down to make a sound.

Optionally, the magnetic circuit system includes a magnetic steel attached to the housing and a coil arranged around the magnetic steel.

Optionally, the magnetization directions of the magnetic steels of the two magnetic circuit systems are the same, and the current directions of the coils of the two magnetic circuit systems are opposite.

Optionally, the housing includes a first magnetic yoke and a second magnetic yoke that cooperate to form the receiving space, and the magnetic conductive diaphragm is disposed between the first magnetic yoke and the second magnetic yoke; The two magnetic circuit systems are respectively disposed in the space surrounded by the first magnetic yoke and the magnetically conductive diaphragm, and in the space surrounded by the second magnetic yoke and the magnetically conductive diaphragm.

Optionally, the first yoke includes a top wall and a first side wall extending from the top wall, the second yoke includes a bottom wall and a second side wall extending from the bottom wall; two In the magnetic circuit system, the magnetic steel of one of the magnetic circuit systems is arranged on the top wall and forms a first gap with the first side wall, and the magnetic steel of the other magnetic circuit system is arranged on the top wall. A second gap is formed between the bottom wall and the second side wall, and the two coils are respectively arranged in the first gap and the second gap.

Optionally, the first side wall and the second side wall respectively fix the magnetic conductive diaphragm from opposite sides of the magnetic conductive diaphragm.

Optionally, the thicknesses of the bottom wall and the top wall are both smaller than the thickness of the first side wall or the thickness of the second side wall.

Optionally, the first side wall and/or the second side wall is provided with a sound outlet that communicates with the receiving space.

Optionally, the magnetic steel is provided with an air flow channel with an opening facing the magnetic conducting diaphragm, the bottom wall and the top wall are respectively provided with sound outlet holes communicating with the air flow channel, and the magnetic circuit system It also includes a sound transmission magnet arranged in the air flow channel, and a plurality of pore structures are distributed in the sound transmission magnet.

Optionally, the magnetic conductive diaphragm is a planar magnetic conductive diaphragm.

The present invention also provides an earphone, the earphone includes the above-mentioned sound generating unit.

By setting the magnetic circuit system on both sides of the magnetic conductive diaphragm, the energization of the coil can be controlled, so that the magnetic circuit system can generate an alternating electromagnetic field, and the magnetic conductive diaphragm can vibrate in the vibration space under the action of the alternating electromagnetic field, saving energy. To set the voice coil connected with the diaphragm, so that only the magnetic conductive diaphragm vibrates, and the vibration components to be driven by the magnetic circuit system are of small mass, which can improve the high-frequency performance, and can improve the sound-electric conversion efficiency; The membrane is directly connected with the housing, which facilitates the assembly of the sound-emitting unit, and at the same time helps to improve the conversion efficiency of sound and electricity.

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 structure diagram of an embodiment of a sounding monomer of the present invention;

FIG. 2 is a schematic diagram of the disassembled structure of an embodiment of the sounding monomer of the present invention;

FIG. 3 is a schematic diagram of the force analysis of the coil of an embodiment of the present invention when the coil is not energized;

FIG. 4 is a schematic diagram of force analysis when the coil of an embodiment of the sounding monomer of the present invention is energized;

FIG. 5 is a schematic diagram of a disassembled structure of an embodiment of a sounding monomer of the present invention;

FIG. 6 is a schematic cross-sectional structure diagram of another embodiment of the sounding monomer of the present invention;

FIG. 7 is a schematic cross-sectional structure diagram of another embodiment of the sounding monomer of the present invention;

FIG. 8 is a schematic diagram of the magnetic field distribution when the casing of an embodiment of the sounding unit of the present invention is a non-magnetic conductive material;

FIG. 9 is a schematic diagram of the magnetic field distribution of another embodiment of the generating unit according to the present invention, where the casing is a magnetic conductive material.

Description of the reference numerals of the embodiment:

标号label	名称 name	标号label		名称name
1010	发声单体 sounding unit	11	壳体 case
1111	第一磁轭 first yoke	111111	顶壁 top wall
113113	第一侧壁 first side wall	1212	出声孔 sound hole
1313	第二磁轭 second yoke	131131	底壁 bottom wall
133133	第二侧壁 second side wall	33	导磁振膜 Magnetic diaphragm
55	磁路系统 Magnetic circuit system	5151	磁钢 magnetic steel
5252	气流通道 airflow channel	5353	线圈 coil
5555	传音导磁体 sound transmission magnet	1515	安装台Mounting table

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.

In addition, descriptions involving "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 implying 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.

The present invention provides a sound-generating unit 10 .

1 and 2, the technical solution of the present invention proposes a sound-generating unit 10, the sound-generating unit 10 includes a housing 1 with a receiving space, a magnetic conductive diaphragm 3 and two magnetic circuit systems 5 arranged in the receiving space, The two magnetic circuit systems 5 are relatively spaced apart, and the edge of the magnetic conductive diaphragm 3 is fixed to the housing 1 to be suspended between the two magnetic circuit systems. Vibration and sound under the action of electromagnetic field.

In the prior art, the voice coil is connected to the diaphragm, and the voice coil is inserted into the magnetic gap. After the voice coil is energized, under the action of the magnetic field, the voice coil reciprocates in the magnetic gap to push the diaphragm to vibrate. The difference between the present invention and the structure in which the voice coil pushes the diaphragm to produce sound in the prior art is that the voice coil connected to the magnetically conductive diaphragm 3 is not provided in the present invention. When the magnetic circuit system 5 is energized, an alternating electromagnetic field is generated under the interaction of the two magnetic circuit systems 5, and the magnetic conductive diaphragm 3 moves along the connecting line direction of the two magnetic circuit systems 5 directly under the action of the alternating electromagnetic field, that is, Vibration and sound are generated in the vibration space formed between the two magnetic circuit systems 5 . During the sounding process of the sounding unit 10, only the magnetic conductive diaphragm 3 moves.

The edge of the magnetic conductive diaphragm 3 is directly connected to the housing 1, avoiding other fixing structures, and there are fewer parts, thus facilitating product assembly. The edge of the magnetic conductive diaphragm 3 can be directly connected to the smooth inner wall of the housing 1 , or structures such as mounting grooves and protrusions can be provided on the housing 1 to facilitate the magnetic conductive diaphragm 3 to be fixed and suspended at a preset position. Since the magnetic conductive diaphragm 3 is directly fixed through the housing 1, no other fixing components are provided between the magnetic conductive diaphragm 3 and the magnetic circuit system 5, and the magnetic field distribution between the magnetic conductive diaphragm 3 and the magnetic circuit system 5 is not affected by other fixed components. Due to the influence of the fixed components, no separate component is required to support the magnetic circuit system 5, which can reduce the gap between the magnetic conductive diaphragm 3 and the magnetic circuit system 5, which is beneficial to improve the acousto-electrical conversion efficiency.

In the present invention, by arranging the magnetic circuit system 5 on both sides of the magnetic conductive diaphragm 3, the energization of the coil 53 can be controlled, so that the magnetic circuit system 5 generates an alternating electromagnetic field, and the magnetic conductive diaphragm 3 is in the alternating electromagnetic field. Under the action, it can vibrate in the vibration space, eliminating the need to set up a voice coil connected to the diaphragm, so that only the magnetic conductive diaphragm 3 vibrates, and the vibration components to be driven by the magnetic circuit system 5 are of small mass, which can improve high-frequency performance and can improve Acoustic-electrical conversion efficiency: The present invention facilitates the assembly of the sound-generating unit 10 by directly connecting the magnetic conductive diaphragm 3 to the housing 1, and at the same time helps to improve the acousto-electrical conversion efficiency.

Optionally, the magnetic circuit system 5 includes a magnetic steel 51 attached to the casing 1 and a coil 53 arranged around the magnetic steel 51 . When the coils 53 located on both sides of the magnetic conductive diaphragm 3 are not energized, the magnetic conductive diaphragm 3 is only affected by the magnetic field generated by the magnetic steel 51 located on both sides. At this time, the magnetic size and shape of the two magnetic steels 51 can be controlled. etc., so that the magnetic conductive diaphragm 3 can remain stationary at a preset position in the vibration space. When the coils 53 located on both sides of the magnetic conductive diaphragm 3 are energized, the two coils 53 interact to generate an alternating electromagnetic field, so that the magnetic conductive diaphragm 3 is vibrated by the driving force to produce sound.

Compared with the arrangement in which the coil 53 is arranged inside the magnetic steel 51, the present invention arranges the coil 53 around the magnetic steel 51, so that in the magnetic field generated by the magnetic circuit system 5, the intensity of the permanent magnetic field in the central region is compared with that in the edge region. The strength of the permanent magnetic field is greater. When the coil 53 is energized, the magnetic field strength of the alternating magnetic field experienced by the central region of the magnetic permeable diaphragm 3 is greater than the magnetic field strength of the alternating magnetic field received by the edge region of the magnetic permeable diaphragm 3. Therefore, the magnetic permeability The driving force received by the central area of the diaphragm 3 is greater than the driving force received by the edge area of the magnetic conductive diaphragm 3, so that the magnetic conductive diaphragm 3 is more easily affected by the alternating electromagnetic field to generate sound and vibrate. In one embodiment, the magnetic steel 51 , the coil 53 and the balance diaphragm are coaxially arranged to facilitate vibration balance.

Optionally, the magnetization directions of the magnets 51 of the two magnetic circuit systems 5 are the same, and the current directions of the coils 53 of the two magnetic circuit systems 5 are opposite.

Please refer to FIGS. 3 and 4 , wherein FIG. 3 is a force analysis diagram of the magnetic conductive diaphragm 3 in an embodiment when the coil 53 is not energized; FIG. 4 is a magnetic conductive vibration in an embodiment when the coil 53 is energized Force analysis diagram of membrane 3. In the embodiment shown in FIG. 3 , the magnetic steel 51 located above the magnetic conductive diaphragm 3 and the magnetic steel 51 located below the magnetic conductive diaphragm 3 are both N-pole at the upper end and S-pole at the lower end, that is, the magnetic steel 51 has a The magnetization direction is the same, the direction of the magnetic field line is from the N pole to the S pole, and the magnetic field line is the direction shown by the arrow in the figure because of the magnetic permeability of the magnetic permeable diaphragm 3 . Since the magnetic conductive diaphragm 3 is subjected to opposite directions of the magnetic forces of the two magnetic steels 51 , the magnetically conductive diaphragm 3 can be suspended between the two magnetic steels 51 in a balanced manner.

In the embodiment shown in FIG. 4 , the magnetic steel 51 located above the magnetic conductive diaphragm 3 and the magnetic steel 51 located below the magnetic conductive diaphragm 3 are both N-pole at the upper end and S-pole at the lower end, and are located at the upper magnetic steel at the same time. The current direction of the coil 53 outside 51 is left in and right out, and the current direction of the coil 53 outside the lower magnetic steel 51 is right in and left out, that is, the current directions of the two coils 53 are opposite. According to Ampere's law, it is determined that the upper end of the coil 53 above the magnetic conductive diaphragm 3 is the S pole and the lower end is the N stage, and the coil 53 located below the magnetic conductive diaphragm 3 is determined.

The opposite sides of the magnetic conductive diaphragm 3 are magnetized by the upper magnetic steel 51 and the lower magnetic steel 51 to generate polarity. The upper side of the magnetic conductive diaphragm 3 is the N pole, and the lower side is the S pole; the lower end of the upper coil 53 is the N pole. The upper end of the lower coil 53 is N pole and the lower side of the magnetic conductive diaphragm 3 attracts the opposite sex, so that under the action of the two superimposed forces, the magnetic conductive diaphragm 3 moves toward the upper side of the magnetic conductive diaphragm 3. The lower deformation generates vibration, thereby further improving the electro-acoustic conversion efficiency of the sound-generating unit 10 .

From another perspective, as shown in Figure 3, when the two coils are not energized, the magnetic flux in the magnetic permeable diaphragm is ΦA=Φ _g1 +Φ _g2 =Φ _g +(-Φ _g )≈0; among them, Φ _g1 is the magnetic flux generated by the upper magnetic steel 51, the direction of φ _g1 is defined as the positive direction, Φ _g2 is the magnetic flux generated by the lower magnetic steel 51, the magnetic flux generated by the lower magnetic steel 51 and the magnetic flux generated by the upper magnetic steel 51 are the same in size and opposite in direction, Its direction is negative.

As shown in FIG. 4 , when the two coils are supplied with opposite currents, the magnetic flux of the magnetic conductive diaphragm 3 subjected to the upper magnetic circuit system 5 is: φ ₁ =φ _g1 +φ _i1 =φ _g +(-φ _i ), where , the direction of the magnetic flux generated by the current of the upper coil 53 is opposite to the direction of the magnetic flux generated by the upper magnetic steel 51 , which is a negative direction.

The magnetic flux of the magnetic conductive diaphragm 3 received by the lower magnetic circuit system 5 is: φ ₂ =φ _g2 +φ _i2 =(-φ _g )+(-φ _i ), the direction of the magnetic flux generated by the current of the lower coil 53 is generated by the lower magnetic steel 51 The direction of the magnetic flux is the same, which is the negative direction.

Therefore, the magnetic flux φ ₁ received by the magnetic diaphragm 3 from the upper magnetic circuit system 5 < the magnetic flux φ ₂ received by the magnetic conductive diaphragm 3 from the lower magnetic circuit system 5 .

And, when the two coils pass through the reverse current, ΦA'=Φ ₁₊ Φ ₂₌ Φ _g +(-Φ _i )+(-Φ _g )+(-Φ _i )=-2Φ _i , if this energized state In the final state, the initial state with no potential applied, the change of the magnetic flux in the magnetic permeable diaphragm 3 is: Δφ=ΦA'-ΦA=-2φ _i -0=-2φ _i .

The electromagnetic force Fφ received by the magnetic conductive diaphragm 3 is proportional to the rate of change of the magnetic flux, that is, Fφ is proportional to Δφ/Δt=−2φ _i /Δt. In the embodiment shown in FIG. 4 , the electromagnetic force Fφ pushes the magnetic conductive diaphragm 3 to move toward the lower magnetic circuit system 5 . Similarly, when the current direction of the coil 53 above and below the magnetic conductive diaphragm 3 is the opposite direction as shown in FIG. 4 , through the above derivation process, it can be known that the magnetic conductive diaphragm 3 is subjected to the magnetic flux of the upper magnetic circuit system 5 φ ₁ ′>magnetic conductive vibration The membrane 3 is subjected to the magnetic flux φ ₂ ' of the magnetic circuit system 5 below, and the electromagnetic force Fφ' received by the magnetic permeable diaphragm 3 is proportional to the rate of change of the magnetic flux, that is, Fφ' and Δφ'/Δt=2φ _i /Δt proportional. The electromagnetic force generated by the magnetic circuit system 5 pushes the magnetic conductive diaphragm 3 to move closer to the upper magnetic circuit system 5 , so that the magnetic conductive diaphragm 3 can be controlled to vibrate and sound by controlling the current in the coil 53 .

When the housing 1 is a non-magnetically conductive material, as shown in FIG. 8 , the magnetic field distribution has obvious magnetic flux leakage, and the magnetic field lines diverge to the outside of the sound generating unit 10 more, which affects the electro-acoustic conversion efficiency.

Please refer to FIGS. 1 and 2 again, the housing 1 includes a first magnetic yoke 11 and a second magnetic yoke 13 that cooperate to form a receiving space, and the magnetic conductive diaphragm 3 is arranged between the first magnetic yoke 11 and the second magnetic yoke 13 , The two magnetic circuit systems 5 are respectively disposed in the space surrounded by the first magnetic yoke 11 and the magnetically conductive diaphragm 3 and in the space surrounded by the second magnetic yoke 13 and the magnetically conductive diaphragm 3 . The first magnetic yoke 11 and the second magnetic yoke 13 are magnetic conductive parts, and the magnetic conductive diaphragm 3 is in direct contact with the magnetic conductive housing 1. As shown in FIG. 9, the magnetic circuit is more concentrated and complete, which is beneficial to improve the electro-acoustic conversion. efficiency.

Optionally, the first magnetic yoke 11 includes a top wall 111 and a first side wall 113 extending from the top wall 111, and the second magnetic yoke 13 includes a bottom wall 131 and a second side wall 133 extending from the bottom wall 131; two In the magnetic circuit system 5 , the magnetic steel 51 of one magnetic circuit system 5 is arranged on the top wall 111 and forms a first gap with the first side wall 113 , and the magnetic steel 51 of the other magnetic circuit system 5 is arranged on the bottom wall 131 A second gap is formed between it and the second side wall 133. The two coils 53 are respectively arranged in the first gap and the second gap. The second side wall 133 , the other coil 53 and the other magnetic steel 51 are sequentially sleeved. The magnetic steel 51 can be directly attached to the top wall 111 or the bottom wall 113 , while the coil 53 can be wound on the magnetic steel 51 , or can be pre-wound and attached to the top wall 111 or the bottom wall 113 . The components of the magnetic circuit system 5 are set in sequence, thereby effectively reducing the size of the sounding unit 10 .

Optionally, the first side wall 113 and the second side wall 133 respectively fix the magnetic conductive diaphragm 3 from opposite sides of the magnetic conductive diaphragm 3, that is, the edge of the magnetic conductive diaphragm 3 can be fixed by glue, welding, etc. It is arranged at the end of the first side wall 113 or the second side wall 133 , and then the first magnetic yoke 11 and the second magnetic yoke 13 are fixed together with the cover, so as to facilitate product assembly.

Referring to FIGS. 6 and 7 , the thicknesses of the bottom wall 131 and the top wall 111 are both smaller than the thickness of the first side wall 113 or the thickness of the second side wall 133 . The thickness of the bottom wall 131 and the thickness of the top wall 111 are both perpendicular to the direction of the magnetic conductive diaphragm 3 , and the thickness of the first side wall 113 and the thickness of the second side wall 133 are both perpendicular to the direction of the airflow channel 52 . By thickening the first side wall 113 and the second side wall 133 , the contact area between the magnetic conductive diaphragm 3 and the housing 1 is increased, and the stability is increased. In another embodiment, the first side wall 113 and the second side wall 133 extend in a direction close to the coil 53 to form the mounting table 15 , and the edge of the magnetic conductive diaphragm 3 is mounted on the mounting table 15 .

Please refer to FIGS. 1 and 2 , the magnetic steel 51 has an air flow channel 52 with an opening facing the magnetic conductive diaphragm 3 , and the bottom wall 131 and the top wall 111 are respectively provided with sound outlet holes 12 communicating with the air flow channel 52 . By opening the sound outlet 12, it is beneficial to maintain the air pressure balance in the accommodation space, which is beneficial to the vibration of the magnetic conductive diaphragm 3 in the accommodation space, and the airflow pushed by the magnetic conductive diaphragm 3 can be transmitted to the air through the air passage 52 and the sound outlet 12. external.

Further, the magnetic circuit system 5 further includes a sound-transmitting magnet 55 disposed in the airflow channel 52 , and a plurality of pore structures are distributed in the sound-transmitting magnet 55 . The sound-transmitting magnet 55 is a magnetic-conducting member, which can increase the magnetic permeability of the magnetic circuit system 5. Due to the distribution of the pore structure, the air in the accommodation space can be communicated with the outside through the pore structure, and the airflow pushed by the magnetic-conducting diaphragm 3 is still It can be transmitted to the outside through the pore structure. In this embodiment, the magnetic steel 51 and the sound-transmitting magnet 55 are separately provided components, and the sound-transmitting magnet 55 may be foamed iron-nickel. In other embodiments, the magnetic steel 51 and the sound-transmitting magnet 55 may also be integrally formed.

Those skilled in the art can open sound outlet holes 12 at different positions of the housing 1 that communicate with the receiving space and the outside as required. Please refer to FIG. 5 , the first side wall 113 and/or the second side wall 133 are provided with sound outlet holes 12 communicating with the receiving space. In this embodiment, the sound outlet 12 is provided on the first side wall 113 and/or the second side wall 133 , and the magnetic steel 51 may not be provided with the airflow channel 52 .

In one embodiment, the magnetic conductive diaphragm 3 is a planar magnetic conductive diaphragm. Compared with the diaphragm having the folded ring structure in the prior art, the planar magnetic conductive diaphragm 3 provided in the present invention can reduce the size of the sounding unit 10 . Specifically, the magnetic conductive diaphragm 3 includes a metal body, and the metal body includes one or more of stainless steel S430, silicon steel, SPCC, iron-nickel alloy, iron-cobalt-vanadium alloy, and soft ferrite. Compared with rubber or paper diaphragms, when the metal body vibrates, the sound quality emitted has a metallic texture. The magnetic conductive diaphragm 3 may also include a damping layer disposed on the metal body, and the damping layer may be an adhesive film layer, PEEK, TPU, TPEE, or the like. The damping property of the magnetic conductive diaphragm 3 can be adjusted through the damping layer, which is beneficial to the balance of the vibration of the magnetic conductive diaphragm 3 and brings a more delicate hearing sense. In another embodiment, the magnetic conductive diaphragm 3 includes a substrate and a magnetic conductive layer disposed on the substrate, the substrate is any one of metal or non-metal, elastomer or non-elastomeric body, and the magnetic conductive layer is nickel , iron-nickel alloy, iron-phosphorus alloy and other powders with soft magnetic properties are arranged on the substrate by plating, deposition, magnetron sputtering, etc. The thickness of the magnetic conductive diaphragm 3 is 10-40um.

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Under the inventive concept of the present invention, the equivalent structure transformation made by using the contents of the description and drawings of the present invention, or directly/indirectly applied to other All relevant technical fields are included within the scope of patent protection of the present invention.

Claims

A sound-generating unit, characterized in that the sound-generating unit comprises a housing with a receiving space, a magnetic conducting diaphragm and two magnetic circuit systems arranged in the receiving space, and the two magnetic circuit systems are opposite to each other. spaced apart, the edge of the magnetic conductive diaphragm is fixed with the casing to be suspended between the two magnetic circuit systems, and the magnetic conductive diaphragm is used for the alternating electromagnetic field generated in the magnetic circuit system Vibrate and sound under the action.
The sound-generating unit according to claim 1, wherein the magnetic circuit system comprises a magnetic steel attached to the housing and a coil arranged around the magnetic steel.
The sound-generating unit according to claim 2, wherein the magnetization directions of the magnetic steels of the two magnetic circuit systems are the same, and the current directions of the coils of the two magnetic circuit systems are opposite.
The sound-generating unit according to claim 2, wherein the housing comprises a first magnetic yoke and a second magnetic yoke that cooperate to form the receiving space, and the magnetic conductive diaphragm is arranged on the first magnetic yoke between the yoke and the second magnetic yoke; the two magnetic circuit systems are respectively arranged in the space surrounded by the first magnetic yoke and the magnetic conductive diaphragm, and the second magnetic yoke and the magnetic conductive diaphragm in the space surrounded by the magnetic diaphragm.
The sound-generating unit of claim 4, wherein the first magnetic yoke includes a top wall and a first side wall extending from the top wall, and the second magnetic yoke includes a bottom wall and a first side wall extending from the top wall. a second side wall extending from the bottom wall; the magnetic steel of one of the two magnetic circuit systems is arranged on the top wall and forms a first gap with the first side wall, and the other The magnetic steel of the magnetic circuit system is arranged on the bottom wall and forms a second gap with the second side wall, and the two coils are respectively arranged in the first gap and the second gap .
The sound-generating unit according to claim 5, wherein the first side wall and the second side wall respectively fix the magnetic conductive diaphragm from opposite sides of the magnetic conductive diaphragm.
The sound-generating unit according to claim 5, wherein the thicknesses of the bottom wall and the top wall are both smaller than the thickness of the first side wall or the thickness of the second side wall.
The sound-generating unit according to claim 5, wherein the housing further comprises a mounting platform extending from the first side wall and the second side wall to a direction close to the coil, the The edge of the magnetic conductive diaphragm is mounted on the mounting table.
The sound-generating unit according to claim 5, wherein the magnetic steel is provided with an air flow channel with an opening facing the magnetic conductive diaphragm, and the bottom wall and the top wall are respectively provided with a communication channel for the air flow The sound outlet hole of the channel, the magnetic circuit system further includes a sound transmission magnet arranged in the air flow channel, and a plurality of pore structures are distributed in the sound transmission magnet.
The sound-generating unit according to any one of claims 1 to 9, wherein the magnetic conductive diaphragm is a planar magnetic conductive diaphragm.