CN114727203A

CN114727203A - Sound production device and electronic equipment

Info

Publication number: CN114727203A
Application number: CN202210404432.3A
Authority: CN
Inventors: 葛连山; 韩志磊; 王建建
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2022-04-18
Filing date: 2022-04-18
Publication date: 2022-07-08

Abstract

The invention discloses a sound generating device and electronic equipment, wherein the sound generating device comprises a shell, a vibration system and a magnetic circuit system, the shell is provided with a mounting cavity and a gas release hole, the cavity wall of the mounting cavity is provided with a gas guide groove communicated with the gas release hole, the vibration system comprises a vibrating diaphragm and a voice coil, the vibrating diaphragm and the voice coil are arranged in the mounting cavity, the voice coil is arranged on one side of the vibrating diaphragm to drive the vibrating diaphragm to vibrate, the vibrating diaphragm divides the mounting cavity into a front sound cavity and a rear sound cavity, the gas guide groove and the gas release hole are positioned in the rear sound cavity, the magnetic circuit system comprises a first magnetic circuit part arranged in the rear sound cavity, the first magnetic circuit part covers the gas release hole and is matched with the gas guide groove to form a gas release channel, and the gas release channel is communicated with the gas release hole and the rear sound cavity. The invention aims to provide the sound production device which can effectively improve the tone quality and improve the high-pitch effect, so that the sound production device can keep the frequency response performance stable in a high-temperature and high-humidity environment.

Description

Sound production device and electronic equipment

Technical Field

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

Background

A speaker, also called a horn, is widely used as an electroacoustic transducer in electronic devices such as speakers, earphones, mobile phones, and the like. Current loudspeakers can be classified in terms of their operating principle into moving-coil loudspeakers, moving-iron loudspeakers and flat-diaphragm loudspeakers. In the related art, in order to seek higher sound quality for electronic devices such as earphones, a multi-driving unit, that is, a tweeter and a woofer are often used in combination. However, the size of the tweeter is smaller and smaller, the structural design of the existing product is limited by the overall dimension, and the sound leakage hole meeting the use requirement of the tweeter cannot be normally formed. Therefore, the rear cavity of the high pitch loudspeaker cannot be deflated, and the frequency response performance can be reduced under the high-temperature and high-humidity environment, so that the tone quality of the electronic equipment is influenced, and the using effect of a user is influenced.

Disclosure of Invention

The invention mainly aims to provide a sound generating device and electronic equipment, and aims to provide the sound generating device which can effectively improve the tone quality and improve the high-pitch effect, so that the sound generating device can keep the stable frequency response performance in a high-temperature and high-humidity environment.

In order to achieve the above object, the present invention provides a sound generating device, including:

the air guide structure comprises a shell, a valve body and a valve body, wherein the shell is provided with an installation cavity and an air release hole, and the wall of the installation cavity is provided with an air guide groove communicated with the air release hole;

the vibration system comprises a vibrating diaphragm and a voice coil which are arranged in the installation cavity, the voice coil is arranged on one side of the vibrating diaphragm to drive the vibrating diaphragm to vibrate, the vibrating diaphragm divides the installation cavity into a front sound cavity and a rear sound cavity, and the air guide groove and the air release hole are positioned in the rear sound cavity; and

magnetic circuit, magnetic circuit is including locating the first magnetic circuit part in the back sound intracavity, first magnetic circuit part covers the hole of disappointing, and with the cooperation of air guide groove forms the passageway of disappointing, the passageway intercommunication of disappointing the hole with back sound chamber.

In one embodiment, the housing comprises a first shell, the first shell comprises a bottom part and a side part arranged on the periphery of the bottom part, the bottom part and the side part enclose to form a first mounting groove, the diaphragm covers a notch of the first mounting groove, and the air release hole is arranged on the bottom part;

the air guide groove comprises a first section and a second section which are communicated, the first section is concavely arranged at the bottom and is communicated with the air leakage hole, and the second section is concavely arranged at the side part;

the first magnetic circuit part is connected to the bottom and covers the air release hole, and the first magnetic circuit part is matched with the first section and the second section to form the air release channel.

In an embodiment, the second segment extends along the side portion to a height greater than a horizontal projection of the first magnetic circuit portion on the side portion.

In one embodiment, the difference between the extension height of the second segment along the side part and the horizontal projection height of the first magnetic circuit part on the side part is defined as d1, and the height from one end of the side part far away from the bottom part to the side of the first magnetic circuit part, which faces away from the bottom part, is defined as d 2;

wherein d1/d2 is not more than 5/6.

In one embodiment, the width of the air guide groove in the direction perpendicular to the extension direction of the first segment is defined as d3, and the length of the first magnetic circuit part in the direction perpendicular to the extension direction of the first segment is defined as d 4;

wherein d3/d4 is less than or equal to 0.05.

In an embodiment, the housing further includes a second housing, the second housing is provided with a second mounting groove, and the second housing is connected to the first housing, so that the second mounting groove and the first mounting groove enclose to form the mounting cavity;

the periphery of the vibrating diaphragm is clamped between the first shell and the second shell so that the vibrating diaphragm and the first mounting groove are enclosed to form the rear sound cavity, and the vibrating diaphragm and the second mounting groove are enclosed to form the front sound cavity;

the magnetic circuit system also comprises a second magnetic circuit part which is arranged in the second mounting groove.

In one embodiment, the first shell comprises an injection molded part and a metal part which are integrally injection molded, the metal part comprises a bottom plate and a side plate connected to the bottom plate, the injection molded part is arranged on the periphery of the bottom plate and is connected with the side plate, the injection molded part and the side plate are matched to form the side part, the bottom plate forms the bottom part, the air release hole and the first section are arranged on the bottom plate, and the second section is arranged on the side plate;

and/or the second shell comprises a central part and an edge part arranged on the periphery of the central part, the edge part and the central part surround to form the second mounting groove, the edge part bends and extends towards the direction far away from the second magnetic circuit part relative to the central part so as to define a gluing groove with the side part, and sealing glue is filled in the gluing groove.

In one embodiment, the width of the air guide groove ranges from 0.06mm to 0.1 mm;

and/or the depth range of the air guide groove is 0.03 mm-0.05 mm;

and/or the air guide groove is of a V-shaped groove or square groove structure.

In an embodiment, the diaphragm includes a central portion, a folded ring portion disposed around the central portion, and a fixing portion disposed outside the folded ring portion, the fixing portion is interposed between the first casing and the second casing, the folded ring portion protrudes toward the interior of the rear acoustic cavity, and an extending direction of the fixing portion is opposite to a protruding direction of the folded ring portion;

and/or the diaphragm is a single-layer metal material piece; or the vibrating diaphragm is formed into a composite layer structure, and at least the surface of the vibrating diaphragm, which is connected with the voice coil, is made of a metal material;

and/or the vibration system further comprises a reinforcement member disposed between the central portion and the voice coil;

and/or the voice coil is at least provided with a first conducting wire section and a second conducting wire section which are oppositely arranged, and the current directions in the first conducting wire section and the second conducting wire section are opposite;

and/or the second shell is provided with a sound outlet communicated with the front sound cavity, and the shell further comprises a sound mouth arranged at the sound outlet.

In one embodiment, the first magnetic circuit portion includes at least three first magnetic members arranged in a horizontal direction;

the first magnetic pieces located in the middle position are magnetized in the vertical direction, and the magnetizing directions of the two adjacent first magnetic pieces are opposite;

and/or a connecting piece is arranged between two adjacent first magnetic pieces so as to limit an assembly gap between the two first magnetic pieces; or, two adjacent first magnetic pieces are arranged in an abutting mode.

The invention also provides electronic equipment which comprises an equipment shell and the sound generating device, wherein the sound generating device is arranged in the equipment shell.

According to the sound production device, the mounting cavity is arranged in the shell, so that the mounting cavity is conveniently used for mounting and fixing the vibration system and the magnetic circuit system, the vibration diaphragm of the vibration system is used for dividing the mounting cavity into the front sound cavity and the rear sound cavity, the voice coil is arranged along the surface of the vibration diaphragm, the first magnetic circuit part of the magnetic circuit system is arranged in the rear sound cavity and is opposite to the voice coil, and therefore a strong magnetic field is generated by the first magnetic circuit part, the vibration diaphragm and the voice coil are in a strong magnetic field intensity, the magnetic induction lines at the vibration diaphragm are uniformly distributed, the change of the magnetic field intensity has good linearity, the tone quality of audio output by the sound production device can be effectively improved, and the high-pitch effect is improved; simultaneously, through set up the hole of disappointing on the shell, and be equipped with the air guide groove at the chamber wall of installation cavity, make the first magnetic circuit part of locating the back sound intracavity form the passageway that loses heart with the air guide groove cooperation, utilize the passageway intercommunication that loses heart hole and back sound chamber, the cooperation in so usable passageway that loses heart and the hole of losing heart realizes disappointing to back sound chamber, the realization carries out the effect of pressure release to back sound chamber, thereby guarantee sound generating mechanism under high temperature and high humidity environment, the frequency response stable performance.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a sound generating device according to an embodiment of the present invention;

fig. 2 is a schematic structural view of another view angle of the sound generating device according to an embodiment of the present invention;

FIG. 3 is an exploded view of the sound generator according to an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of a sound generator according to an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of another direction of the sound generating device according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a first housing according to an embodiment of the invention;

FIG. 7 is a FR performance test chart of the prior art sounding device under normal environment and high temperature and high humidity environment;

fig. 8 is a FR performance test chart of the sound generating device of the present invention under a high temperature and high humidity environment and a conventional sound generating device under a normal environment.

The reference numbers illustrate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

Also, the meaning of "and/or" and/or "appearing throughout is meant to encompass three scenarios, exemplified by" A and/or B "including scenario A, or scenario B, or scenarios where both A and B are satisfied.

In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

In the related art, in order to seek higher sound quality for electronic devices such as earphones, a multi-driving unit, that is, a tweeter and a woofer are often used in combination. However, the size of the tweeter is smaller and smaller, the structural design of the existing product is limited by the overall dimension, and the sound leakage hole meeting the use requirement of the tweeter cannot be normally formed. Thereby make high pitch loudspeaker's back chamber unable lose heart for back chamber and front chamber form the atmospheric pressure difference, so under the high temperature and high humidity environment, can lead to the frequency response performance to descend, thereby influenced electronic equipment's tone quality, influenced user's result of use. Simultaneously, current tweeter adopts the shell steel sheet to mould plastics integrative structure usually, does not have the position of revealing, and the rubber coating of week circle is sealed simultaneously, and the general existence treble effect is relatively poor scheduling problem.

Based on the above-mentioned conception and problems, the present invention provides a sound generating device 100. It is understood that the sound generating apparatus 100 can be applied to electronic devices such as a sound box, an earphone, a mobile phone, and the like, and is not limited herein.

Referring to fig. 1 to 6, in an embodiment of the present invention, the sound generating apparatus 100 includes a housing 1, a vibration system 2, and a magnetic circuit system 3, where the housing 1 is provided with a mounting cavity 11 and a relief hole 121, a cavity wall of the mounting cavity 11 is provided with a vent groove 123 communicating with the relief hole 121, the vibration system 2 includes a diaphragm 21 and a voice coil 22 disposed in the mounting cavity 11, the voice coil 22 is disposed on one side of the diaphragm 21 to drive the diaphragm 21 to vibrate, the diaphragm 21 divides the mounting cavity 11 into a front sound cavity 14 and a rear sound cavity 15, the vent groove 123 and the relief hole 121 are disposed in the rear sound cavity 15, the magnetic circuit system 3 includes a first magnetic circuit portion 31 disposed in the rear sound cavity 15, the first magnetic circuit portion 31 covers the relief hole 121 and cooperates with the vent groove 123 to form a relief channel 128, and the relief channel 128 communicates the vent hole 121 and the rear sound cavity 15.

In the present embodiment, the housing 1 is used for mounting, fixing, supporting and protecting the components of the vibration system 2, the magnetic circuit system 3, and the like, that is, the housing 1 provides a mounting base for the components of the vibration system 2, the magnetic circuit system 3, and the like. It is understood that the housing 1 may be a mounting case, a shell or a box with a mounting cavity 11, and is not limited herein.

In the present embodiment, the housing 1 may be configured in a circular or square structure, and the like, which is not limited herein. The housing 1 includes a first shell 12 and a second shell 13 cooperating with the first shell 12, such that the first shell 12 and the second shell 13 enclose a mounting cavity 11. It will be appreciated that the second housing 13 may be provided in a U-shaped configuration, which may include a flat bottom wall and side walls provided on the bottom wall. The first housing 12 may also be configured in a U-shaped configuration that may include a flat top wall and side walls that each include the top wall. The first housing 12 and the second housing 13 are thus cross-locked together to define a mounting chamber 11 for mounting the vibration system 2, the magnetic circuit system 3, and the like. Of course, in other embodiments, the second housing 13 may also be a flat plate structure, which is not limited herein.

It is understood that the vibration system 2 includes a diaphragm 21 and a voice coil 22, the voice coil 22 is disposed on the diaphragm 21, and the diaphragm 21 may be a flat diaphragm structure, so that the voice coil 22 is disposed on the flat surface of the diaphragm 21. In this embodiment, the voice coil 22 may be a flexible circuit board attached to the diaphragm 21. The voice coil 22 may be formed by a plurality of coils disposed on the same surface of the diaphragm 21, and is not limited herein.

Alternatively, the diaphragm 21 may be made of a metal material or a non-metal material, such as paper, PET (polyester film), PEEK (polyether ether ketone), PAR (polyarylate), PI (polyimide), PEN, woven glass fiber, or aluminum, and the like, which is not limited herein. Further, the diaphragm 21 may be a metal planar diaphragm.

In the present embodiment, the magnetic circuit system 3 includes the first magnetic circuit portion 31 disposed in the rear sound cavity 15, and the diaphragm 21 and the voice coil 22 of the vibration system 2 are located in the magnetic field strength formed by the first magnetic circuit portion 31, so that the magnetic induction lines at the diaphragm 21 are uniformly distributed, the variation of the magnetic field strength has good linearity, the sound quality of the audio output by the sound generating apparatus 100 can be effectively improved, and the high-pitched sound effect is improved.

In one embodiment, the voice coil 22 is disposed along the surface of the diaphragm 21 and opposite to the first magnetic circuit portion 31, the central axis of the voice coil 22 is perpendicular to the diaphragm 21, the voice coil 22 has at least a first conducting wire section 221 and a second conducting wire section 222 disposed opposite to each other, and the directions of currents flowing in the first conducting wire section 221 and the second conducting wire section 222 are opposite. Therefore, the diaphragm 21 and the voice coil 22 are located in the magnetic field formed by the first magnetic circuit portion 31, so as to generate a magnetic force acting on the voice coil 22 when the voice coil 22 is energized with a current, and further drive the diaphragm 21 to vibrate and sound in a reciprocating manner in the direction of the magnetic force. It can be understood that, when a current is applied to the voice coil 22, the directions of the currents flowing in the first wire segment 221 and the second wire segment 222, which are oppositely disposed in the voice coil 22, are opposite.

Alternatively, the first magnetic circuit portion 31 of the magnetic circuit system 3 may be an electromagnet or a permanent magnet, but its magnetic properties remain unchanged.

In the present embodiment, as shown in fig. 3 to 6, by providing the air release hole 121 in the housing 1 and providing the air guide groove 123 communicating with the air release hole 121 on the wall of the mounting cavity 11, the first magnetic circuit portion 31 is disposed in the rear acoustic cavity 15 so as to cover the air release hole 121 and abut against the bottom wall and the side wall of the mounting cavity 11, so that the first magnetic circuit portion 31 cooperates with the air guide groove 123 to form the air release channel 128, and the air release channel 128 communicates with the air release hole 121 and the rear acoustic cavity 15. It can be understood, after vibrating diaphragm 21 at vibration system 2 separates installation cavity 11 for preceding acoustic cavity 14 and back acoustic cavity 15, disappointing hole 121 is through disappointing passageway 128 intercommunication back acoustic cavity 15, thereby utilize the cooperation of disappointing passageway 128 and disappointing hole 121 to realize disappointing back acoustic cavity 15, with the air pressure difference of balanced preceding acoustic cavity 14 and back acoustic cavity 15, sound generating mechanism 100 is under high temperature and high humidity environment, can keep the frequency response stable performance, thereby promote electronic equipment's tone quality, user's result of use is improved. Moreover, set up air guide groove 123 on the inner wall of shell 1 through the aforesaid, first magnetic circuit portion 31 forms disappointing passageway 128 with the cooperation of air guide groove 123, disappointing passageway 128 and disappointing hole 121 intercommunication, can solve from this and hardly directly set up the problem in disappointing hole when sound generating mechanism 100 whole size is less, above-mentioned technical scheme can direct control air guide groove 123's air guide area is in order to adjust the area of disappointing hole 121, high-performance speaker's problem of leaking the sound hole can't be seted up to convenient operation, effectively solved high-pitch speaker.

The sound production device 100 of the invention is provided with the mounting cavity 11 in the shell 1, so that the mounting cavity 11 is conveniently used for mounting and fixing the vibration system 2 and the magnetic circuit system 3, the vibration film 21 of the vibration system 2 is used for dividing the mounting cavity 11 into the front sound cavity 14 and the rear sound cavity 15, the voice coil 22 is arranged along the surface of the vibration film 21, the first magnetic circuit part 31 of the magnetic circuit system 3 is arranged in the rear sound cavity 15 and is opposite to the voice coil 22, the second magnetic circuit part 32 is arranged in the front sound cavity 14, so that the first magnetic circuit part 31 is used for generating a stronger magnetic field, the vibration film 21 and the voice coil 22 are in stronger magnetic field intensity, the magnetic induction lines at the vibration film 21 are uniformly distributed, the change of the magnetic field intensity has good linearity, the tone quality of audio output by the sound production device 100 can be effectively improved, and the high-pitch effect is improved; meanwhile, through set up disappointing hole 121 on shell 1, and be equipped with air guide groove 123 in the chamber wall of installation cavity 11, make first magnetic circuit part 31 and the cooperation of air guide groove 123 that locate in back sound cavity 15 form disappointing passageway 128, utilize disappointing passageway 128 intercommunication disappointing hole 121 and back sound cavity 15, so usable disappointing passageway 128 and the cooperation of disappointing hole 121 realize disappointing to back sound cavity 15, thereby guarantee that sound generating mechanism 100 is under the high temperature and high humidity environment, the frequency response performance is stable.

It can be understood that the sound generating device 100 of the present invention realizes micro-leakage by arranging the air guide groove 123 and the air release hole 121, thereby effectively improving the reliability of the product, reducing the occurrence of bad phenomena in the whole machine, and reducing the poor market feedback, and the sound generating device 100 has strong realizability and high mass production.

In an embodiment, as shown in fig. 3 and 4, the magnetic circuit system 3 further comprises a second magnetic circuit portion 32, the second magnetic circuit portion 32 being disposed in the front acoustic cavity 14. It can be understood that, by arranging the first magnetic circuit portion 31 and the second magnetic circuit portion 32 on the two opposite sides of the diaphragm 21, the first magnetic circuit portion 31 and the second magnetic circuit portion 32 form a stronger magnetic field on the two opposite sides of the diaphragm 21 and the voice coil 22, so that the diaphragm 21 and the voice coil 22 of the vibration system 2 are in a stronger magnetic field strength, the magnetic induction lines at the diaphragm 21 are uniformly distributed, the change of the magnetic field strength has good linearity, the tone quality of the audio output by the sound generating device 100 can be effectively improved, and the treble effect is improved.

Alternatively, the first magnetic circuit portion 31 of the magnetic circuit system 3 may be an electromagnet or a permanent magnet, but its magnetic properties remain unchanged. The second magnetic circuit portion 32 may be an electromagnet or a permanent magnet, but its magnetic properties remain unchanged.

In an embodiment, the housing 1 includes a first casing 12 and a second casing 13, wherein the first casing 12 is provided with a first mounting groove 122 and a relief hole 121 communicating with the first mounting groove 122, a groove wall of the first mounting groove 122 is provided with an air guide groove 123, a first magnetic circuit portion 31 is disposed in the first mounting groove 122 and abuts against a groove wall of the first mounting groove 122 to cover the relief hole 121 and a portion of the air guide groove 123, the second casing 13 is provided with a second mounting groove 131, a second magnetic circuit portion 32 is disposed in the second mounting groove 131, and the second casing 13 is connected with the first casing 12 to enclose the second mounting groove 131 and the first mounting groove 122 to form the mounting cavity 11.

In the present embodiment, as shown in fig. 1 to 6, the assembly of the components such as the vibration system 2 and the magnetic circuit system 3 is facilitated by providing the casing 1 as a two-part structure of the first case 12 and the second case 13. It can be understood that the first housing 12 and the second housing 13 can be fixedly connected into an integral structure by welding, bonding, or the like in a sealing fit manner, so that the connection stability and the sealing performance of the first housing 12 and the second housing 13 can be improved. Of course, in other embodiments, the first housing 12 and the second housing 13 may also be connected to each other by a detachable connection manner, such as a snap connection, a plug-in fit, a screw connection, or a pin connection, so as to facilitate the assembly, disassembly, or replacement of the components of the vibration system 2 and the magnetic circuit system 3. When the first housing 12 and the second housing 13 are connected as a whole, the second mounting groove 131 and the first mounting groove 122 enclose the mounting cavity 11.

It is understood that the first mounting groove 122 is provided in the first housing 12 to achieve the limit mounting of the first magnetic circuit portion 31 by using the first mounting groove 122, and the second mounting groove 131 is provided in the second housing 13 to achieve the limit mounting of the second magnetic circuit portion 32 by using the second mounting groove 131. In this embodiment, the air release hole 121 penetrates through a groove wall of the first mounting groove 122.

In this embodiment, the air release hole 121 runs through the groove wall of the first mounting groove 122, the air guide groove 123 is concavely arranged on the groove wall of the first mounting groove 122, when the first magnetic circuit portion 31 is arranged in the first mounting groove 122, the first magnetic circuit portion 31 abuts against the bottom wall and the side wall of the first mounting groove 122, so that the first magnetic circuit portion 31 covers the air release hole 121, the first magnetic circuit portion 31 covers the notch of the air guide groove 123, and the air release channel 128 which is communicated with the air release hole 121 and the rear sound cavity 15 is formed by being surrounded by the air guide groove 123. It will be appreciated that one end of the bleed passage 128 communicates with the bleed hole 121 and the other end of the bleed passage 128 communicates with the rear acoustic cavity 15, so that the rear acoustic cavity 15 is bled by the cooperation of the bleed passage 128 and the bleed hole 121.

In one embodiment, the first housing 12 includes a bottom 124 and a side 125 disposed at a periphery of the bottom 124, the bottom 124 and the side 125 enclose to form a first mounting groove 122, the diaphragm 21 covers a notch of the first mounting groove 122, and the air release hole 121 is disposed at the bottom 124; the air guide groove 123 comprises a first section 1231 and a second section 1232 which are communicated, the first section 1231 is concavely arranged on the bottom 124 and is communicated with the air release hole 121, and the second section 1232 is concavely arranged on the side 125; the first magnetic circuit portion 31 is connected to the bottom 124 and covers the air-release hole 121, and the first magnetic circuit portion 31 cooperates with the first section 1231 and the second section 1232 to form the air-release passage 128.

In the present embodiment, as shown in fig. 1 to fig. 6, by disposing the air release hole 121 on the bottom 124 of the first casing 12, on the one hand, the processing of the first casing 12 is facilitated, and on the other hand, the appearance of the sound generating device 100 can be improved. It can be understood that, by disposing the air guide groove 123 as the first and

second sections

1231 and 1232 which are communicated with each other, the first section 1231 is recessed in the bottom 124 and is communicated with the air release hole 121, and the second section 1232 is recessed in the side 125, so that when the first magnetic circuit portion 31 is connected to the bottom 124 by bonding, welding or the like, and the first magnetic circuit portion 31 abuts against the side 125, the first magnetic circuit portion 31 covers the air release hole 121 and the first section 1231 disposed on the bottom 124, and the first magnetic circuit portion 31 covers the second section 1232 disposed on the side 125, that is, one end of the second section 1232 far away from the first section 1231 is exposed out of one side surface of the first magnetic circuit portion 31 facing away from the bottom 124, so that the first magnetic circuit portion 31 cooperates with the first and

second sections

1231 and 1232 to form the air release channel 128, thereby realizing the air release of the rear acoustic cavity 15.

Optionally, the side 125 of the first housing 12 is perpendicular to the bottom 124. The base 124 may alternatively be a square configuration. In order to adjust the size of the sound leakage area, the plurality of air leakage holes 121 and the plurality of air guide grooves 123 may be provided, and the plurality of air leakage holes 121 are spaced apart and are respectively communicated with the plurality of air guide grooves 123. Of course, the air release hole 121 may also be a bar-shaped or ring-shaped hole structure, which is correspondingly communicated with the plurality of air guide grooves 123, and is not limited herein.

In the present embodiment, the air leakage hole 121 may be a circular hole, an elliptical hole, a triangular hole, a square hole, or a trapezoidal hole, which is not limited herein. In order to ensure the frequency response performance of the sound generating device 100, the air release area of the air release hole 121 is less than or equal to 0.02 mm.

In an embodiment, the second housing 13 is provided with a second mounting groove 131, and the second housing 13 is connected with the first housing 12, so that the second mounting groove 131 and the first mounting groove 122 enclose the mounting cavity 11; the periphery of the diaphragm 21 is clamped between the first casing 12 and the second casing 13, so that the diaphragm 21 and the first mounting groove 122 enclose to form the rear acoustic cavity 15, and the diaphragm 21 and the second mounting groove 131 enclose to form the front acoustic cavity 14; the magnetic circuit system 3 further includes a second magnetic circuit portion 32, and the second magnetic circuit portion 32 is provided in the second mounting groove 131.

In this embodiment, as shown in fig. 4, the periphery of the diaphragm 21 is sandwiched between the first casing 12 and the second casing 13, so that the diaphragm 21 and the first mounting groove 122 enclose to form the rear acoustic cavity 15, and the diaphragm 21 and the second mounting groove 131 enclose to form the front acoustic cavity 14, which can not only improve the mounting stability of the diaphragm 21, but also provide a sufficient vibration space for the diaphragm 21 by using the space of the first mounting groove 122 and the second mounting groove 131.

In one embodiment, as shown in fig. 4, the extension height of the second segment 1232 along the side portion 125 is greater than the horizontal projection height of the first magnetic circuit portion 31 on the side portion 125. That is, the second segment 1232 extends longer than the height of the first magnetic path portion 31 in the height direction of the side portion 125. It is understood that the end of the second segment 1232 of the air guide groove 123 far from the first segment 1231 is exposed out of one side surface of the first magnetic circuit portion 31 facing away from the bottom 124, so that the second segment 1232 is communicated with the rear acoustic cavity 15 above one side surface of the first magnetic circuit portion 31 facing away from the bottom 124 to ensure the air leakage smoothness.

It is understood that the air guide groove 123 may be a groove structure recessed in the side 125 and the bottom 124 of the first housing 12. Of course, in other embodiments, a channel cavity structure communicating the air release hole 121 and the rear sound cavity 15 may be provided inside the side 125 and the bottom 124 of the first casing 12, which is not limited herein.

In one embodiment, as shown in fig. 4, the difference between the extension height of the second segment 1232 along the side portion 125 and the horizontal projection height of the first magnetic circuit portion 31 on the side portion 125 is defined as d1, and the height from the end of the side portion 125 far away from the bottom portion 124 to the side of the first magnetic circuit portion 31 facing away from the bottom portion 124 is defined as d 2; wherein d1/d2 is not more than 5/6.

It can be understood that the ratio of the difference d1 between the height of the second segment 1232 along the side 125 and the projected height of the first magnetic circuit portion 31 on the side 125 to the height d2 from the end of the side 125 far away from the bottom 124 to the side of the first magnetic circuit portion 31 opposite to the bottom 124 is 5/6 or less, so that when the first casing 12 and the second casing 13 are connected by gluing and sealing, the glue is prevented from flowing down along the side 125 to block the air guide groove 123, and the air leakage openness of the rear sound cavity 15 is ensured.

In one embodiment, as shown in fig. 5, the width of the air guide groove 123 in the direction perpendicular to the extension direction of the first segment 1231 is defined as d3, and the length of the first magnetic circuit portion 31 in the direction perpendicular to the extension direction of the first segment 1231 is defined as d 4; wherein d3/d4 is less than or equal to 0.05.

It will be appreciated that the width d3 of the air guide groove 123 is related to the length d4 of the first magnetic circuit portion 31, and the longer the length d4 of the first magnetic circuit portion 31, the greater the width d3 of the air guide groove 123. In the present embodiment, by defining the ratio of the width d3 of the air guide groove 123 to the length d4 of the first magnetic circuit portion 31 to be 0.05 or less, the air leakage smoothness of the rear acoustic cavity 15 can be ensured while ensuring the stability of the squealing performance.

In an embodiment, the width of the air guide groove 123 ranges from 0.06mm to 0.1mm, that is, the width d3 of the air guide groove 123 may be 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, etc., which is not limited herein, so that the air release area of the air release passage 128 can be ensured.

In one embodiment, the depth of the air guide groove 123 ranges from 0.03mm to 0.05 mm. It will be appreciated that the depth of the air guide groove 123 is the depth of the air guide groove 123 in a direction perpendicular to the bottom 124. Alternatively, the depth of the air guide groove 123 ranges from 0.03mm, 0.04mm, 0.05mm, etc., which is not limited herein, so that the air release area and the air release smoothness of the air release passage 128 can be ensured. Optionally, the air guide groove 123 is a V-groove or a square groove structure, which is not limited herein.

In one embodiment, the first housing 12 includes an injection molded piece 126 and a metal piece 127, the metal piece 127 includes a bottom plate 1271 and a side plate 1272 connected to the bottom plate 1271, the injection molded piece 126 is disposed on the periphery of the bottom plate 1271 and connected to the side plate 1272, the injection molded piece 126 and the side plate 1272 cooperate to form the side portion 125, the bottom plate 1271 forms the bottom portion 124, the relief hole 121 and the first section 1231 are disposed on the bottom plate 1271, and the second section 1232 is disposed on the side plate 1272.

In the present embodiment, as shown in fig. 1 to 6, by providing the first casing 12 with the injection molded part 126 and the metal part 127, the bottom plate 1271 of the metal part 127 is used as a main part of the bottom 124 of the first casing 12, and thus the first magnetic circuit portion 31 is fixed on the bottom plate 1271 of the metal part 127, so that the heat dissipation effect of the sound generating device 100 is improved by the metal part 127, and the volume of the rear sound cavity 15 of the sound generating device 100 is effectively improved. Alternatively, the metal member 127 is a thin metal sheet, and the bottom plate 1271 and the side plate 1272 may be formed integrally by bending or punching, etc., which is not limited herein.

It can be understood that the injection-molded part 126 is a plastic part, and the injection-molded part 126 and the metal part 127 can be integrally formed by an injection molding process, so that the structural strength of the first housing 12 can be improved, and the sealing effect of the first housing 12 can also be improved.

In the present embodiment, the bottom panel 1271 of the metal member 127 is provided with the air release hole 121 and the first section 1231, and the side panel 1272 of the metal member 127 is provided with the second section 1232, so that the metal member 127 can be conveniently formed by punching.

In an embodiment, the second casing 13 includes a central portion 133 and an edge portion 134 disposed at the periphery of the central portion 133, the edge portion 134 and the central portion 133 enclose to form a second mounting groove 131, the edge portion 134 is bent and extended relative to the central portion 133 in a direction away from the second magnetic circuit portion 32 to define a glue applying groove 135 with the side portion 125, and the glue applying groove 135 is filled with sealing glue.

In the present embodiment, as shown in fig. 2 and 4, the second mounting groove 131 is enclosed by the central portion 133 and the edge portion 134 by providing the second housing 13 as the central portion 133 and the edge portion 134 such that the edge portion 134 is connected to the outer periphery of the central portion 133. It will be appreciated that the second magnetic circuit portion 32 is fixed to the central portion 133. By extending the edge portion 134 in a bent manner with respect to the central portion 133 in a direction away from the second magnetic path portion 32, the edge portion 134 of the second case 13 and the side portion 125 of the second case 13 define the glue applying groove 135 when the second case 13 is connected to the first case 12 via the edge portion 134. Optionally, the rim portion 134 may be optionally of an L-shaped configuration.

It can be understood that, by filling the glue groove 135 with a sealing glue, the sealing glue is solidified to form a sealing element, so that the connection stability and the sealing performance between the first casing 12 and the second casing 13 can be effectively improved.

In one embodiment, the diaphragm 21 includes a central portion 211, a ring-folded portion 212 disposed around the central portion 211, and a fixing portion 213 disposed outside the ring-folded portion 212, the fixing portion 213 is interposed between the first casing 12 and the second casing 13, the ring-folded portion 212 protrudes toward the rear acoustic cavity 15, and an extending direction of the fixing portion 213 is opposite to a protruding direction of the ring-folded portion 212.

In the present embodiment, as shown in fig. 3 and 4, the fixing portion 213 of the diaphragm 21 is interposed between the edge portion 134 and the side portion 125. It will be appreciated that voice coil 22 is routed along the surface of central portion 211, opposite first magnetic circuit portion 31. The fixing portion 213 of the diaphragm 21 is interposed between the edge portion 134 and the side portion 125, which can not only improve the mounting stability of the diaphragm 21, but also increase the effective vibration area of the diaphragm 21 and improve the sound effect of the sound generating apparatus 100.

Alternatively, the corrugated portion 212 is convex toward the rear sound chamber 15, and the fixing portion 213 extends in the direction opposite to the protruding direction of the corrugated portion 212. This prevents interference of the vibration of the folded ring portion 212 by the edge portion 134 of the second housing 13.

In one embodiment, the diaphragm 21 is a single-layer metal material. It will be appreciated that the diaphragm 21 may alternatively be a planar single layer piece of metal material, thereby increasing the sensitivity of the diaphragm 21. Alternatively, the diaphragm 21 is an aluminum plate or the like, which is not limited herein.

Of course, in other embodiments, the diaphragm 21 may also be made of a single-layer film material made of materials such as PET (polyester film), PEEK (polyether ether ketone), PAR (polyarylate), or PI (polyimide), which is not limited herein.

Because the diaphragm 21 of the single-layer film material is too hard and brittle, the surface of the diaphragm 21 is not flat when the tension is small, and the diaphragm 21 is too tight when the tension is large, the film is easy to break; or too soft, the surface tension of the diaphragm 21 is insufficient, and since the diaphragm 21 is too easily stretched, the tension becomes smaller with time or after vibration, eventually resulting in too loose the diaphragm 21. In addition, the internal damping of the single-layer film material is insufficient, and the transient characteristics of the diaphragm 21 have poor trailing edge characteristics, that is, when the vibration coil is turned off, the diaphragm 21 needs to delay for a longer time to stop vibrating due to the too small internal damping. In one embodiment, the diaphragm 21 is formed as a composite layer structure, and at least the surface of the diaphragm 21 connected to the voice coil 22 is made of a metal material.

It is understood that the diaphragm 21 is provided as a composite layer structure, so that the diaphragm 21 can provide a good supporting function and provide sufficient rigidity. In the present embodiment, the surface of the diaphragm 21 connected to the voice coil 22 is made of a metal material, so that the metal material can be used to achieve a good supporting effect and provide sufficient rigidity, and other composite structures of the diaphragm 21 provide good elasticity and sufficient damping, so that the diaphragm 21 has a low distortion effect in a relatively large vibration range.

In this embodiment, the diaphragm 21 may be a double-layer or multi-layer composite structure, which is not limited herein. In the embodiment, a two-layer composite structure is taken as an example, the diaphragm 21 includes a first sub-diaphragm and a second sub-diaphragm, the first sub-diaphragm can provide a good supporting effect and provide sufficient rigidity, and the second sub-diaphragm can provide good elasticity and sufficient damping, so that the diaphragm 21 has a low distortion effect in a relatively large vibration range.

It is understood that the material of the first sub-diaphragm may be a metal material, such as an aluminum plate, and the like, and the material of the second sub-diaphragm may be PEEK (polyether ether ketone), PAR (polyarylate), TPU (Thermoplastic polyurethane elastomers), TPE (Thermoplastic Elastomer), or the like. The first sub-diaphragm and the second sub-diaphragm can be bonded by an adhesive layer such as acrylic, silica gel or other soft polymer materials, and the like, which is not limited herein.

In one embodiment, as shown in fig. 4, the vibration system 2 further includes a reinforcing member 23, and the reinforcing member 23 is disposed between the central portion 211 and the voice coil 22. It will be appreciated that by providing the reinforcement member 23, the central portion 211 of the diaphragm 21 can be reinforced by the reinforcement member 23 to enhance the vibration effect. The stiffness of the reinforcing member 23 is greater than the stiffness of the diaphragm 21 to reinforce the overall stiffness of the surface of the diaphragm 21 so that the surface of the diaphragm 21 has a vibration amplitude as uniform as possible, and the diaphragm 21 exhibits a global piston vibration.

Alternatively, the shape of the stiffener 23 may be circular, but of course, the shape of the stiffener 23 may also be strip-shaped, comb-shaped, or the like. In one embodiment, a plurality of stiffeners 23 are disposed on the diaphragm 21, the extending direction of the stiffeners 23 is crossed with the voice coil 22, and is optionally vertical, so as to form a cross grid shape, the voice coil 22 can also play a role in enhancing the overall rigidity of the surface of the diaphragm 21, and the voice coil 22 and the stiffeners 23 enhance the overall rigidity of the surface of the diaphragm 21.

In one embodiment, as shown in FIG. 3, voice coil 22 is formed in a square shape. It will be appreciated that by configuring the voice coil 22 to have a square configuration such that the voice coil 22 includes a first straight side and a second straight side that are sequentially connected, i.e., the first conductor segment 221 and the second conductor segment 222 of the voice coil 22 are two opposite first straight sides or two second straight sides, respectively, the configuration is such that the voice coil 22 effectively increases the magnetic flux relative to a conventional racetrack-type voice coil.

Alternatively, two voice coils 22 are provided, and the two voice coils 22 are disposed on the upper and lower sides of the diaphragm 21. It is understood that the voice coil 22 may be formed by printing, or evaporation, or 3D printing on the surface of the diaphragm 21. The surface of the diaphragm 21 may be provided with the voice coil 22 only, or both surfaces of the surface of the diaphragm 21 may be provided with the voice coil 22, which is not limited herein.

The current is conducted on the voice coil 22 to drive the diaphragm 21 to vibrate towards a predetermined direction so as to generate sound, wherein the direction of the magnetic force exerted on the voice coil 22 is continuously changed by continuously changing the current flowing direction in the voice coil 22, so that the reciprocating vibration of the diaphragm 21 is controlled. It is understood that the greater the number of voice coils 22, the greater the magnetic force for driving the diaphragm 21 to vibrate, and the higher the sensitivity for controlling the vibration of the diaphragm 21. However, the size of the surface of the diaphragm 21 and the product specification of the sound generating device 100 need to be considered, and is not limited herein.

In this embodiment, the material of the lead of the voice coil 22 may be metal such as aluminum, copper, nickel, gold, silver, or an alloy of these metals, which is not limited herein.

Since only the portion of the surface of the diaphragm 21 where the voice coil 22 is disposed will receive the magnetic force, and the portion where the voice coil 22 is not disposed will not receive the magnetic force, the portion of the diaphragm 21 where the voice coil 22 is disposed and the portion where the voice coil 22 is not disposed will exhibit different split vibrations, i.e., the portion of the surface of the diaphragm 21 where the voice coil 22 is disposed will have a larger vibration amplitude than the portion where the voice coil 22 is not disposed. As a result, a peak-valley is generated in the frequency response curve of the sound generating device 100, so that the audio output by the sound generating device 100 is distorted, and finally the acoustic performance of the sound generating device 100 is deteriorated.

In view of this, the vibration system 2 further includes a reinforcing member 23, and the reinforcing member 23 is provided on the surface of the diaphragm 21.

In one embodiment, as shown in fig. 1 to 4, the second casing 13 is provided with a sound outlet 132 communicating with the front sound cavity 14, and the housing 1 further includes a mouthpiece 16 provided at the sound outlet 132. It will be appreciated that by providing the sound outlet 132 in the central portion 133 of the second housing 13, the sound generated by the vibration of the diaphragm 21 is facilitated to be emitted outside the housing 1 through the sound outlet 132. The transmission effect can be improved by providing the mouthpiece 16.

In one embodiment, the first magnetic circuit portion 31 includes at least three first magnetic members 311 arranged in a horizontal direction.

In the present embodiment, as shown in fig. 3 to 5, the first magnetic member 311 may be an electromagnet or a permanent magnet, but its magnetism remains unchanged. Any adjacent first magnetic members 311 may be disposed at intervals, abutted, connected by a connecting member, or the like, and are not limited herein. It can be understood that the first magnetic member 311 located at the middle position is magnetized in the vertical direction, and the magnetizing directions of the adjacent two first magnetic members 311 are opposite.

Of course, the second magnetic circuit portion 32 comprises at least one second magnetic element, which may be an electromagnet or a permanent magnet, but whose magnetic properties remain unchanged. Any adjacent second magnetic members may be disposed at intervals, abutted, connected through a connecting member, or the like, and are not limited herein.

It can be understood that, when one first magnetic member 311 of the at least three first magnetic members 311 of the first magnetic circuit portion 31 in the magnetic circuit system 3 is magnetized in the vertical direction, the magnetizing directions of two adjacent first magnetic members 311 are opposite, that is, the two first magnetic members 311 with opposite magnetizing directions are arranged alternately, so as to form a magnetic member array, and generate a magnetic field with a stronger magnetic field strength.

Optionally, at least three first magnetic members 311 of the first magnetic circuit portion 31 in the magnetic circuit system 3 may also form a halbach magnetic member array, so that according to the magnetic field law of the halbach array, the portion of the surface of the diaphragm 21 corresponding to the first magnetic member 311 is located in a magnetic field that is better than the portion not corresponding to the first magnetic member 311, including the aspects of the magnetic field strength, the linearity of the magnetic field strength changing with the position, and the distribution uniformity of the magnetic induction lines.

It is understood that the voice coil 22 may alternatively be provided in an area defined by an orthographic projection of the first magnetic member 311 on the surface of the diaphragm 21. Optionally, the orthographic projection of the voice coil 22 on the surface of the diaphragm 21 is located in the orthographic projection of the first magnetic member 311 on the surface of the diaphragm 21, so that the voice coil 22 is in a reasonable magnetic field, distortion of the audio output by the sound generating device 100 is relieved, and the sound quality of the audio output by the sound generating device 100 is improved.

Because the magnetic induction lines in two adjacent first magnetic parts 311 are opposite in direction, the direction of the magnetic force applied to the voice coil 22 corresponding to the two adjacent first magnetic parts 311 is the same, so that the vibration and sound production of the vibrating diaphragm 21 are facilitated, the proportion occupied by a reasonable magnetic field in the magnetic field at the vibrating diaphragm 21 is improved, namely, the proportion of the part, corresponding to the first magnetic part 311, of the surface of the vibrating diaphragm 21 is improved, the rationality of the magnetic field at the vibrating diaphragm 21 is facilitated to be improved, the distortion condition of the audio output by the sound production device 100 is relieved, and the tone quality of the audio output by the sound production device 100 is improved.

It can be understood that, the distances from the surfaces of the two adjacent first magnetic members 311 adjacent to the diaphragm 21 are the same, so as to further improve the rationality of the magnetic field in which the diaphragm 21 is located, further alleviate the distortion of the audio output by the sound generating device 100, and improve the sound quality of the audio output by the sound generating device 100.

In this embodiment, the magnetizing directions of two adjacent first magnetic members 311 of the at least three first magnetic members 311 of the first magnetic circuit portion 31 are opposite, that is, when the N-pole of one first magnetic member 311 of the two adjacent first magnetic members 311 is above and the S-pole is below, the N-pole of the other first magnetic member 311 is below and the S-pole is above, and vice versa. Of course, in other embodiments, two adjacent first magnetic members 311 are spaced apart, so that a horizontal magnetic field can be formed directly above the spacing.

In an embodiment, the first magnetic member 311 located at the middle position is magnetized downward along the vertical direction, and the first magnetic members 311 located at the two ends are respectively magnetized along the horizontal direction and the direction far away from the middle first magnetic member 311.

It is understood that one of the first magnetic members 311 is disposed between two adjacent first magnetic members 311, that is, the N-pole of the first magnetic member 311 between two adjacent first magnetic members 311 is opposite to and spaced apart from one first magnetic member 311, and the S-pole is opposite to and spaced apart from the other first magnetic member 311, which is not limited herein. Alternatively, the two first magnetic members 311 located at both sides of the middle first magnetic member 311 are arranged in the transverse direction, for example, when the N-pole of the middle first magnetic member 311 is located at the lower side and the S-pole is located at the upper side, the S-poles of the two first magnetic members 311 located at both sides of the middle first magnetic member 311 are located at one end close to the middle first magnetic member 311, and the N-pole is located at one end far from the middle first magnetic member 311, or vice versa, which is not limited herein.

Of course, in other embodiments, the first magnetic member 311 located at the middle position is magnetized upward along the vertical direction, and the first magnetic members 311 located at the two ends are respectively magnetized along the horizontal direction and toward the direction close to the middle first magnetic member 311.

In one embodiment, there are three first magnetic members 311, one second magnetic member, and the magnetizing direction of the second magnetic member is opposite to the magnetizing direction of the first magnetic member 311 located at the middle position. The magnetizing direction of the second magnetic part is opposite to the magnetizing direction of the first magnetic part 311 in the middle of the first magnetic circuit part 31, so that the magnetic induction lines of the magnetic field where the diaphragm 21 is located are distributed more uniformly, and the magnetic field intensity change in the vibration direction of the diaphragm 21 has better linearity, so that the performance of the sound generating device 100 is optimized, and the BL of the sound generating device 100 is improved by 37.64%.

In an embodiment, the number of the second magnetic members is the same as the number of the first magnetic members 311, and the magnetizing directions of the first magnetic members 311 and the second magnetic members corresponding to each other up and down are opposite.

In the present embodiment, the number of the first magnetic members 311 is three, five or more; correspondingly, the number of the second magnetic members is one, three, five or more, so that the magnetizing directions of the first magnetic members 311 and the second magnetic members corresponding to each other are opposite. It can be understood that, by respectively providing the second magnetic circuit portion 32 and the first magnetic circuit portion 31 on two opposite sides of the vibration system 2, and making the magnetizing directions of the first magnetic part 311 in the first magnetic circuit portion 31 and the second magnetic part in the second magnetic circuit portion 32 corresponding to each other up and down opposite, that is, making the magnetic fields generated by the magnetic part arrays on the surfaces of two sides of the vibrating diaphragm 21 symmetrical, the magnetic induction lines of the magnetic field in which the vibrating diaphragm 21 is located are distributed more uniformly, and the magnetic field strength variation in the vibration direction of the vibrating diaphragm 21 has better linearity.

Alternatively, the first and second

magnetic circuit portions

31 and 32 located on opposite sides of the vibration system 2 may form an array of halbach magnets, respectively. Of course, in other embodiments, the first magnetic circuit portion 31 and the second magnetic circuit portion 32 located at two opposite sides of the vibration system 2 may also form other magnetic element arrays, which is not limited herein.

In some embodiments of the present invention, by controlling the magnetizing directions of the first magnetic circuit portion 31 and the second magnetic circuit portion 32, so that the second magnetic circuit portion 32 and the first magnetic circuit portion 31 form the halbach magnetic element array on the two side surfaces of the diaphragm 21, respectively, it is beneficial to alleviate the second harmonic distortion and the third harmonic distortion of the diaphragm 21, further alleviate the distortion of the audio output by the sound generating apparatus 100, and improve the sound quality of the audio output by the sound generating apparatus 100. In the present embodiment, by properly adjusting the size of the second magnetic circuit portion 32 so that the size of the second magnetic circuit portion 32 is between the size of the first magnetic circuit portion 31, the effective magnetic field is fully utilized, and the BL value of the sound generating apparatus 100 is further increased.

In the present embodiment, the BL value of the sound generating device 100 is increased by 37.12% by changing the different magnetizing directions of the second magnetic circuit portion 32 and the first magnetic circuit portion 31 on the opposite sides of the vibration system 2 for optimization.

In the present embodiment, the first magnetic circuit portion 31 includes three first magnetic members 311, for example, a middle first magnetic member 311 and adjacent first magnetic members 311 on both sides of the middle first magnetic member 311, and the halbach magnetic member array is formed by adjusting the magnetizing directions of the three first magnetic members 311 in the first magnetic circuit portion 31. It can be understood that, by setting the magnetizing directions of the three first magnetic members 311 to be the first magnetic member 311 located at the middle position to be magnetized downward in the vertical direction, the first magnetic members 311 located at both ends are respectively magnetized horizontally and toward the direction away from the middle first magnetic member 311, thereby generating a magnetic field consisting of a loop of alternating polarities which emanate from the middle first magnetic member 311, are bent along the path above the first magnetic member 311 polarized in the + and-X directions, and finally return to the first magnetic member 311 on the outermost portion of the array.

In an embodiment, the first magnetic members 311 include five first magnetic members 311, the first magnetic member 311 located at the middle position is magnetized downward along the vertical direction, the two first magnetic members 311 located at the two ends are magnetized upward along the vertical direction, and the two first magnetic members 311 disposed at the two sides of the first magnetic member 311 located at the middle position are respectively magnetized along the horizontal direction and the direction far away from the first magnetic member 311 located at the middle position.

It can be understood that the first magnetic circuit portion 31 includes five first magnetic members 311 arranged along the horizontal direction, the first magnetic member 311 located at the middle position is magnetized downward along the vertical direction, the two first magnetic members 311 located at the two ends are magnetized upward along the vertical direction, and the two first magnetic members 311 located at the two sides of the first magnetic member 311 located at the middle position are respectively magnetized along the horizontal direction and the direction far away from the first magnetic member 311 located at the middle position.

The first magnetic circuit portion 31 includes three, five or more first magnetic members 311, and the first magnetic circuit portions 31 of the halbach array are formed by adjusting the magnetizing directions of the three, five or more first magnetic members 311 in the first magnetic circuit portion 31. In the present embodiment, by setting the magnetizing directions of the five first magnetic members 311 to be the first magnetic member 311 located at the middle position to be magnetized downward in the vertical direction, and the two first magnetic members 311 located at both ends to be magnetized upward in the vertical direction, the two or more first magnetic members 311 provided at both sides of the first magnetic member 311 located at the middle position are respectively magnetized in the direction horizontally and toward the first magnetic member 311 away from the middle position, thereby generating a magnetic field constituted by an alternating polarity loop, which is emitted from the middle first magnetic member 311, is bent in the path above the first magnetic members 311 polarized in the + and-X directions, and finally returns to the first magnetic member 311 on the outermost portion of the array.

In one embodiment, a connecting member is disposed between two adjacent first magnetic members 311 to define a fitting gap between the two first magnetic members 311.

In the present embodiment, by providing a connecting member between two adjacent first magnetic members 311, the first magnetic members 311 are fixed by the connecting member, so as to ensure that the relative position relationship between the first magnetic circuit portion 31 and the diaphragm 21 is also fixed, thereby ensuring the vibration frequency of the diaphragm 21. Meanwhile, the connecting piece arranged between the two adjacent first magnetic pieces 41 is used for limiting the assembly gap between the two first magnetic pieces 311, on one hand, the assembly gap is used for facilitating the assembly of the first magnetic circuit part 31, on the other hand, the assembly gap can be used for reducing the obstruction of the magnetic field to the air flow, so that the sound generating device 100 has good air compliance, the tone quality of the audio output by the sound generating device 100 is further improved, the high-pitch effect is improved, and meanwhile, the distortion condition of the audio output by the sound generating device 100 is relieved.

It can be understood that, two adjacent first magnetic members 311 may also be disposed at an interval, so as to form a channel for air flow between two adjacent first magnetic members 311, so as to allow the air flow to flow in the magnetic field, thereby reducing the obstruction of the magnetic field to the air flow, so that the sound generating device 100 has good air compliance, further alleviating the distortion of the audio output by the sound generating device 100, and improving the sound quality and the treble effect of the audio output by the sound generating device 100.

Of course, in other embodiments, the two adjacent first magnetic members 311 may also be fixed in relative position with respect to each other by gluing, mechanically pressing, and fixing to an external structure such as a bracket, so as to ensure that the relative positional relationship between the first magnetic circuit portion 31 and the second magnetic circuit portion 32 on the two side surfaces of the diaphragm 21 and the diaphragm 21 is also fixed, which is not limited herein.

Alternatively, the pitches of any two adjacent first magnetic members 311 are the same. Of course, in other embodiments, the first magnetic member 311 may also be configured as a ring-like magnetic structure, which is not limited herein. The first 311/second 311 magnetic part of the first 31 and second 32 magnetic circuit portions may also be arranged so that different areas of the sheet of magnetic material, e.g. powdered ferrite in an adhesive, are exposed to different magnetic fields for magnetization. Alternatively, the first/second

magnetic pieces

311, 32 of the first and second

magnetic circuit portions

31, 32 may be independent magnets, such as magnetic strips, which may be magnetized in different directions and then arranged side by side to effectively form a flat magnetic array with a rotating magnetic field, without limitation.

In one embodiment, two adjacent first magnetic members 311 are disposed in abutment. It is understood that the two adjacent first magnetic members 311 may be fixed by gluing or mechanical pressing, and the like, which is not limited herein.

As shown in fig. 7 and 8, fig. 7 is a test chart of the reliability performance of the conventional tweeter (i.e. the rear cavity cannot be deflated) in a normal environment and in a high-temperature and high-humidity environment, and fig. 8 is a test chart of the reliability performance of the conventional tweeter (i.e. the rear cavity cannot be deflated) in a normal environment and in a high-temperature and high-humidity environment of the sound generating device 100 of the present application. As can be seen from fig. 7, the conventional tweeter cannot release air from the back cavity, and thus has poor reliability in a high-temperature and high-humidity environment, which may cause a decrease in Frequency Response (FR), thereby affecting the sound quality of the electronic device and the user's performance. It can be known from fig. 8 that, sound generating device 100 of this application utilizes air escape channel 128 and air escape hole 121 to realize the disappointing of back sound chamber 15 through setting up air escape channel 128 and air escape hole 121 to when carrying out the reliability test under the high temperature and high humidity environment, its frequency response performance (FR) is equivalent with the frequency response performance (FR) of current tweeter under normal environment, has consequently guaranteed sound generating device 100 under the high temperature and high humidity environment, and frequency response performance is stable.

The invention further provides an electronic device, which comprises a device shell and the sound generating device 100, wherein the sound generating device 100 is arranged in the device shell. The specific structure of the sound generating device 100 refers to the foregoing embodiments, and since the electronic device adopts all the technical solutions of all the foregoing embodiments, at least all the beneficial effects brought by the technical solutions of the foregoing embodiments are achieved, and no further description is given here.

The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

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

the air guide device comprises a shell, a valve body and a valve core, wherein the shell is provided with an installation cavity and an air release hole, and the wall of the installation cavity is provided with an air guide groove communicated with the air release hole;

2. The sound generating apparatus according to claim 1, wherein the housing includes a first casing, the first casing includes a bottom portion and a side portion disposed on a periphery of the bottom portion, the bottom portion and the side portion enclose a first mounting groove, the diaphragm covers a notch of the first mounting groove, and the air release hole is disposed on the bottom portion;

3. The sound generating apparatus as claimed in claim 2, wherein the second segment extends along the side portion to a height greater than a height of a horizontal projection of the first magnetic circuit portion on the side portion.

4. The sound generating apparatus according to claim 2, wherein the difference between the extension height of said second segment along said side portion and the horizontal projection height of said first magnetic circuit portion at said side portion is defined as d1, and the height from the end of said side portion away from said bottom portion to the side of said first magnetic circuit portion facing away from said bottom portion is defined as d 2;

wherein d1/d2 is not more than 5/6.

5. The sound generating apparatus as claimed in claim 2, wherein the air guide groove is defined to have a width d3 in a direction perpendicular to the extension direction of the first segment, and the first magnetic circuit portion is defined to have a length d4 in the direction perpendicular to the extension direction of the first segment;

wherein d3/d4 is less than or equal to 0.05.

6. The sound generating device according to claim 2, wherein the housing further comprises a second casing, the second casing is provided with a second mounting groove, and the second casing is connected with the first casing, so that the second mounting groove and the first mounting groove enclose to form the mounting cavity;

the magnetic circuit system further comprises a second magnetic circuit part which is arranged in the second mounting groove.

7. The sound generating apparatus according to claim 6, wherein the first casing comprises an injection-molded piece and a metal piece, the injection-molded piece comprises a bottom plate and a side plate connected to the bottom plate, the injection-molded piece is disposed on a periphery of the bottom plate and connected to the side plate, the injection-molded piece is matched with the side plate to form the side portion, the bottom plate forms the bottom portion, the air-release hole and the first section are disposed on the bottom plate, and the second section is disposed on the side plate;

8. The sound generating apparatus according to any one of claims 1 to 7, wherein the width of the air guide groove ranges from 0.06mm to 0.1 mm;

and/or the depth range of the air guide groove is 0.03 mm-0.05 mm;

and/or the air guide groove is of a V-shaped groove or square groove structure.

9. The sound production device according to any one of claims 2 to 7, wherein the diaphragm includes a central portion, a folded ring portion disposed around the central portion, and a fixing portion disposed outside the folded ring portion, the fixing portion is interposed between the first casing and the second casing, the folded ring portion protrudes toward the rear sound cavity, and an extending direction of the fixing portion is opposite to a protruding direction of the folded ring portion;

and/or the vibration system further comprises a stiffener disposed between the central portion and the voice coil;

10. The sound generating apparatus according to any one of claims 1 to 7, wherein the first magnetic circuit portion includes at least three first magnetic members arranged in a horizontal direction;

11. An electronic device comprising a device housing and a sound generating device as claimed in any one of claims 1 to 10, the sound generating device being provided within the device housing.