WO2022068009A1

WO2022068009A1 - Sound production device

Info

Publication number: WO2022068009A1
Application number: PCT/CN2020/129785
Authority: WO
Inventors: 宋威; 肖波; 令狐荣林; 孔晨亮; 章统
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声光电科技(常州)有限公司
Priority date: 2020-09-30
Filing date: 2020-11-18
Publication date: 2022-04-07
Also published as: CN112261551B; CN112261551A

Abstract

The present invention provides a sound production device, comprising a frame, a diaphragm, and a magnet yoke. The frame comprises a first frame and a second frame. The first frame comprises a first frame body for supporting the diaphragm, a first positioning groove formed by recessing one side of the first frame body, and first process notches formed in two opposite sides of the first positioning groove. The second frame comprises a second frame body, a second positioning groove formed by recessing one side of the second frame body, and second process notches formed in two opposite sides of the bottom of the second positioning groove. The second frame body is sleeved on the first frame body, and the second positioning groove and the first positioning groove are completely staggered, such that the second frame body completely covers the first process notches along a direction perpendicular to the vibration direction and the first frame body completely covers the second process notches along a direction perpendicular to the vibration direction. Compared with the prior art, the sound production device is good in reliability and excellent in sound production performance.

Description

sound device

technical field

The invention relates to the field of electro-acoustic conversion, in particular to a sound-generating device used in portable electronic products.

Background technique

As one of the main components of mobile terminals such as mobile phones, sound-emitting devices are mainly used to convert electrical signals into sound signals.

The related art sound-generating device includes a basin frame, a vibration system respectively fixed to the basin frame, and a magnetic circuit system having a magnetic gap, the magnetic circuit including a magnetic yoke fixed to the basin frame and a magnetic yoke fixed to the magnetic yoke. And form the magnetic steel unit of the magnetic gap. The basin frame, the vibration system and the magnetic circuit system together form a sound-emitting inner cavity. In order to improve the acoustic performance of the sound-emitting device, the sound-emitting device of the related art extends on the side of the yoke away from the diaphragm to form a rear sound cavity. The sound-absorbing particles are packed in cans; and in order to further increase the sound-emitting cavity space under the premise that the size of the sound-emitting device remains unchanged, the basin frame is made of metal material to protect the structural strength and make room for the sound-emitting cavity.

In the related art sound-generating device, the basin frame includes a basin frame body for fixing the vibrating membrane, and a positioning groove formed by the depression of the side of the basin frame body away from the vibrating membrane. The positioning groove is used to form a positioning assembly for the yoke to Improve the assembly efficiency and fixing strength, but because the basin frame is made of metal material, when the positioning groove is formed, a process gap will be formed on both sides of the positioning groove due to the molding process. When the positioning is fixed, when the sound-absorbing particles are canned in the sound cavity after assembly, the process gaps on both sides of the positioning groove allow the sound-absorbing particles to enter the sound-emitting inner cavity, thereby affecting the sound-emitting performance.

Therefore, it is necessary to provide a new sound-generating device to solve the above-mentioned technical problems.

technical problem

The purpose of the present invention is to provide a sounding device with good reliability and excellent sounding performance.

technical solutions

In order to achieve the above object, the present invention provides a sound-generating device, which includes a basin frame, a vibration system respectively fixed to the basin frame, and a magnetic circuit system for driving the vibration system to vibrate and sound, the vibration system comprising The vibrating membrane of the basin frame and the voice coil that drives the vibrating membrane to vibrate and sound, the magnetic circuit system includes a magnetic yoke fixed on the side of the basin frame away from the vibrating membrane and a magnetic yoke fixed on the magnetic yoke. A magnetic steel unit with a gap, the voice coil is inserted in the magnetic gap, the basin frame, the vibration system and the magnetic circuit system together form a sounding inner cavity, and the basin frame includes a first basin frame and the second pot holder:

The first pot frame includes a first pot frame body that supports and fixes the diaphragm, and a first positioning groove formed by a recessed end of the first pot frame body close to the magnetic yoke. The opposite ends of the groove bottom are recessed in a direction away from the magnetic yoke to form a first process gap;

The second pot frame includes a second pot frame body that supports and fixes the vibrating film together with the first pot frame body, and a second positioning formed by the concave end of the second pot frame body close to the magnetic yoke a groove, wherein opposite ends of the groove bottom of the second positioning groove are recessed in a direction away from the magnetic yoke to form a second process gap;

The second basin frame body is sleeved on the side of the first basin frame body away from the magnetic circuit system, and the second positioning groove and the first positioning groove are completely perpendicular to the vibration direction of the diaphragm. Displacement arrangement, so that the second pot frame body completely covers the first process notch along the vibration direction perpendicular to the vibrating membrane and the first pot frame body completely covers the vibration direction perpendicular to the vibration direction. The second process gap;

The magnetic yoke comprises a magnetic yoke body, a first positioning wall and a second positioning wall respectively protruding and extending from the magnetic yoke body to the two basin frames, and the first positioning wall is matched with the first positioning groove And the second positioning wall cooperates with the second positioning groove to locate the relative position of the basin frame and the magnetic yoke.

Preferably, an end of the first pot body close to the diaphragm is flush with an end of the second pot body close to the diaphragm.

Preferably, the position of one end of the first pot body away from the vibrating membrane corresponding to the second positioning groove is flush with the groove bottom of the second positioning groove.

Preferably, one end of the second basin frame body away from the vibrating membrane completely covers the first positioning groove along a position perpendicular to the vibration direction corresponding to the position of the first positioning groove.

Preferably, the basin frame has a rectangular structure, the first positioning grooves include two and are respectively located on opposite sides of the first basin frame body, and the second positioning grooves include two and are respectively located on the first basin frame body. On the opposite sides of the two basin frame bodies, the two first positioning grooves and the two second positioning grooves are respectively located on the four sides of the basin frame.

Preferably, the groove bottom of the first positioning groove is closer to the diaphragm than the groove bottom of the second positioning groove; the second positioning wall includes two and is respectively formed by two opposite sides of the yoke body. Extending and forming perpendicular to the vibration direction, the first positioning walls include two and are respectively formed by bending two opposite sides of the yoke body toward the vibrating membrane.

Preferably, the diaphragm includes a first ring-shaped ring portion, a second ring portion surrounding the first ring portion and spaced apart, and a ring-shaped dome; the magnetic steel unit includes a fixed A main magnet on the yoke, a secondary magnet surrounding the main magnet and spaced from the main magnet to form the magnetic gap, and a secondary magnet covered on the main magnet and abutting on the periphery of the main magnet. The magnetic bowl of the secondary magnetic steel; the outer periphery of the second folded ring portion is fixed on the basin frame, and the inner perimeter of the first folded ring portion is fixed on the side of the magnetic bowl away from the secondary magnetic steel and the magnetic steel unit is partially exposed to the diaphragm; the inner periphery of the dome is connected to the outer periphery of the first folded ring, and the outer perimeter of the dome is connected to the outer periphery of the second folded ring. Inner perimeter connection.

Preferably, the vibration system further includes a frame, one end of the frame is connected to the dome, the other end of which extends into the magnetic gap, and the voice coil is supported and fixed to the frame.

Preferably, the magnetic circuit system further comprises a fixing ring, the fixing ring comprises a ring-shaped ring body sleeved on the peripheral side of the magnetic bowl, and an end of the ring body away from the magnetic yoke is bent inwardly The extended clamping wall; the clamping wall is pressed on the side of the magnetic bowl away from the magnetic yoke, the inner periphery of the first folding ring is fixed to the ring body, the basin frame, the diaphragm , the fixing ring, the magnetic bowl and the magnetic yoke together form the sounding inner cavity.

Preferably, the fixing ring further comprises a reinforcing wall extending from one end of the ring body close to the magnetic yoke, the inner periphery of the first folding ring is bent and extended along the reinforcing wall to form an extending wall, the extending wall The wall is attached and fixed to the reinforcing wall.

beneficial effect

Compared with the related art, in the sounding device of the present invention, the basin frame made of metal material is designed as a double basin frame sleeve structure, the second basin frame body is sleeved on the first basin frame body, and the second basin frame body is sleeved on the first basin frame body. The positioning groove and the first positioning groove are completely dislocated, so that the second pot frame body completely covers the first process gap along the vibration direction perpendicular to the diaphragm, and the first pot frame body is along the vibration direction. The second process gap is completely covered perpendicular to the vibration direction. The basin frame design of this structure effectively makes the process gap caused by the molding process to be blocked, and the blocking reliability is good, thereby effectively avoiding the sound cavity after the sound-emitting device is formed. When filling the sound-absorbing particles, the problem of entering the sound-emitting cavity from the process gap improves the acoustic performance and reliability.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, under the premise of no creative work, other drawings can also be obtained from these drawings, wherein:

Fig. 1 is the three-dimensional structure schematic diagram of the sound-emitting device of the present invention;

2 is an exploded view of a partial three-dimensional structure of the sound-emitting device of the present invention;

Fig. 3 is the structural schematic diagram of the basin frame of the sounding device of the present invention;

FIG. 4 is an exploded view of the basin frame structure of the sounding device of the present invention;

FIG. 5 is a cross-sectional view taken along line A-A in FIG. 1 .

Embodiments of the present invention

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. Obviously, the described embodiments are only a part of the embodiments of the present invention, but 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.

Please refer to FIGS. 1-5 at the same time, the present invention provides a sound-generating device 100 , which includes a basin frame 1 , a vibration system 2 and a magnetic circuit system 3 . The vibration system 2 and the magnetic circuit system 3 are respectively fixed to the basin frame 1 , and the vibration system 2 drives the magnetic circuit system 3 to vibrate and emit sound.

In this embodiment, it is preferable that the basin frame 1 is made of a metal material. Under the premise of the same appearance size, the volume of the sound-emitting cavity 10 of the sound-emitting device 100 can be effectively increased, or the volume of the sound-emitting cavity can be the same. , which can effectively reduce the appearance size.

The vibration system 2 includes a diaphragm 21 fixed to the basin frame 1 and a voice coil 22 that drives the diaphragm 21 to vibrate and produce sound.

In this embodiment, the diaphragm 21 includes a first ring-shaped ring portion 211 , a second ring-shaped portion 212 surrounding the first ring portion 211 and spaced apart, and a ring-shaped dome 213 . The inner peripheral edge of the spherical top 213 is connected to the outer peripheral edge of the first folding ring portion 211 , and the outer peripheral edge of the spherical top 213 is connected to the inner peripheral edge of the second folding ring 212 .

More preferably, in this embodiment, the vibration system 2 further includes a frame 23 , one end of the frame 23 is connected to the dome 213 , the other end of which extends into the magnetic gap 20 , and the voice coil 22 supports fixed to the frame 23 .

The magnetic circuit system 3 includes a magnetic yoke 31 fixed on the side of the basin frame 1 away from the diaphragm 21 , and a magnetic steel unit 32 with a magnetic gap 20 fixed on the magnetic yoke 31 . The voice coil 22 inserted in the magnetic gap 20 . The basin frame 1 , the vibration system 2 and the magnetic circuit system 3 together form a sounding inner cavity 10 .

In this embodiment, the basin frame 1 is a metal basin frame, including a first basin frame 11 and a second basin frame 12 .

The first pot frame 11 includes a first pot frame body 111 for supporting and fixing the diaphragm 21 and a first positioning groove 112 formed by a recessed end of the first pot frame body 111 close to the magnetic yoke 31 . The opposite ends of the groove bottom of the first positioning groove 112 are recessed in a direction away from the magnetic yoke 31 to form a first process gap 113 .

The second pot frame 12 includes a second pot frame body 121 that supports and fixes the diaphragm 21 together with the first pot frame body 111 , and an end of the second pot frame body 121 close to the magnetic yoke 31 . The second positioning groove 122 is recessed, and opposite ends of the groove bottom of the second positioning groove 122 are recessed in a direction away from the magnetic yoke 31 to form a second process gap 123 .

The first positioning groove 112 and the second positioning groove 122 are provided for positioning and fixing the magnetic yoke 31. On the one hand, it can quickly locate and improve the assembly efficiency, and on the other hand, it can reduce the thickness of the sound-emitting device along the vibration direction. The thinning of the sound emitting device 100 is utilized.

The first process gap 113 and the second process gap 123 are formed due to the molding process when the metal pot frame forms the first positioning groove 112 and the second positioning groove 122 .

The second pot holder body 121 is sleeved on the side of the first pot holder body 111 away from the magnetic circuit system 3 , and the second positioning groove 122 and the first positioning groove 112 are perpendicular to the The vibration direction of the diaphragm 21 is completely dislocated, so that the second pot frame body 121 completely covers the first process gap 113 along the vibration direction perpendicular to the diaphragm 21 , and the first pot frame body 111 is The second process gap 123 is completely covered along the direction perpendicular to the vibration 21 .

So far, the combination of the first pot frame 11 and the second pot frame 12 makes the first process gap 113 of the pot frame 1 blocked by the second pot frame body 121 , and the second process gap 123 is blocked by the first pot frame body 111 . Blocking, the first basin frame 11 and the second basin frame 12 are shielded from each other, so that the basin frame 1 as a whole is equivalent to a non-process gap structure, which avoids the sound-emitting inner cavity 10 and the outside world (especially the rear sound cavity formed by the sound-emitting device). The problem of communication is avoided, so that the sound-absorbing particles in the rear acoustic cavity are prevented from entering the sound-emitting inner cavity 10, and the acoustic performance and reliability of the sound-emitting device are improved.

The magnetic yoke 31 includes a magnetic yoke body 311 and a first positioning wall 312 and a second positioning wall 313 respectively protruding from the magnetic yoke body 311 toward the basin frame 1 . The first positioning wall 312 cooperates with the first positioning groove 112 and the second positioning wall 313 cooperates with the second positioning groove 122 to locate the relative position of the basin frame 1 and the magnetic yoke 31 . The first positioning wall 312 is clamped and fixed in the first positioning groove 112 , and the second positioning wall 313 is clamped and fixed in the second positioning groove 122 , so that the magnetic circuit system 3 is fixed by the magnetic yoke 31 . Fixed on the basin frame 1.

In this embodiment, since the first pot frame body 111 and the second pot frame body 121 jointly support the vibration system 2 and the magnetic circuit system 3, it is preferable that the end of the first pot frame body 111 close to the diaphragm 21 and the One end of the second pot body 121 close to the diaphragm 21 is flush, so the fixing stability and reliability of the diaphragm 21 are better.

Specifically, one end of the first basin body 111 away from the diaphragm 21 corresponds to the position of the second positioning groove 122 and is flush with the groove bottom of the second positioning groove 122 . That is, the end of the first pot body 111 away from the diaphragm 21 is closer to the diaphragm 21 than the end of the second pot body 121 away from the diaphragm 21 . Since the second process notch 123 is lower than the groove bottom of the second positioning groove 122 , when the first pot holder body 111 is flush with the groove bottom of the second positioning groove 122 , the second process notch 123 is completely covered.

The end of the second pot body 121 away from the diaphragm 21 corresponds to the position of the first positioning groove 112 and completely covers the first positioning groove 112 perpendicular to the vibration direction. The bottom of the first positioning groove 112 is lower than that of the first positioning groove 112 , and when the second pot holder body 121 is flush with the bottom of the first positioning groove 112 , the first process gap 113 is completely covered.

In this embodiment, the basin frame 1 has a rectangular structure, the first positioning grooves 112 include two and are located on opposite sides of the first basin frame body 111 respectively, and the second positioning grooves 122 include two The two first positioning grooves 112 and the two second positioning grooves 122 are respectively located on the four sides of the basin frame 1 to improve the magnetic yoke 31 stability.

The groove bottom of the first positioning groove 112 is closer to the diaphragm 21 than the groove bottom of the second positioning groove 122 , that is, the side of the first pot frame body 111 away from the diaphragm 21 is closer to the second pot frame body 121 The side away from the vibrating membrane 21 is closer to the vibrating membrane 21 , so that the first basin frame 11 can reduce part of the material relative to the second basin frame 12 and reduce the production cost.

Because the positions of the first positioning groove 112 and the second positioning groove 122 are not on the same plane, the second positioning wall 313 includes two correspondingly, and is formed by two opposite sides of the yoke body 311 respectively. Extending perpendicular to the vibration direction, the first positioning walls 312 include two and are respectively formed by bending two opposite sides of the yoke body 311 toward the vibrating membrane 21 .

The magnetic steel unit 32 includes a main magnetic steel 321 fixed to the yoke 31 , a secondary magnetic steel 322 surrounding the main magnetic steel 321 and spaced from the main magnetic steel 321 to form the magnetic gap 20 , and a cover. The main magnetic steel 321 is in contact with the magnetic bowl 323 fixed to the auxiliary magnetic steel 322 at its periphery.

The outer peripheral edge of the second folding ring portion 212 is fixed to the basin frame 1, and the inner peripheral edge of the first folding ring portion 211 is fixed to the side of the magnetic bowl 323 away from the auxiliary magnetic steel 322 so that all The magnetic steel unit 32 is partially exposed to the diaphragm 323 , so that the design of the magnetic circuit system 3 is more flexible.

More preferably, the magnetic circuit system 3 further includes a fixing ring 33, and the fixing ring 33 includes a ring-shaped ring body 331 sleeved on the peripheral side of the magnetic bowl 323, and the ring body 331 is away from the One end of the magnetic yoke 31 is bent inwardly and extends to a clamping wall 332 . The clamping wall 332 is pressed on the side of the magnetic bowl 323 away from the magnetic yoke 31 , and the inner periphery of the first folding ring 211 is fixed to the ring body 331 , thereby enhancing the fixing ring 33 and the magnetic bowl 323 fixed strength and reliability. The basin frame 1 , the diaphragm 21 , the fixing ring 33 , the magnetic bowl 323 and the magnetic yoke 31 together enclose the sounding cavity 10 .

Specifically, the fixing ring 33 further includes a reinforcing wall 333 extending from one end of the ring body 331 close to the magnetic yoke 31 , and the inner periphery of the first folding ring 211 is formed by bending and extending along the reinforcing wall 333 The extension wall 214 is attached and fixed to the reinforcing wall 333 to improve the structural fixing strength and reliability of the diaphragm 21, the first folding ring 211 and the magnetic circuit system 3, and improve the stability.

The above are only the embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present invention, but these belong to the present invention. scope of protection.

Claims

A sound-generating device comprising a basin frame, a vibration system respectively fixed to the basin frame and a magnetic circuit system for driving the vibration system to vibrate and emit sound, the vibration system comprising a vibrating membrane fixed to the basin frame and a driving device. The diaphragm vibrates and produces a voice coil, and the magnetic circuit system includes a magnetic yoke fixed on the side of the basin frame away from the diaphragm and a magnetic steel unit with a magnetic gap fixed on the magnetic yoke. The ring is inserted into the magnetic gap, and the basin frame, the vibration system and the magnetic circuit system together form a sounding inner cavity, and it is characterized in that the basin frame includes a first basin frame and a second basin frame :

The first pot frame includes a first pot frame body that supports and fixes the diaphragm, and a first positioning groove formed by a recessed end of the first pot frame body close to the magnetic yoke. The opposite ends of the groove bottom are recessed in a direction away from the magnetic yoke to form a first process gap;

The second pot frame includes a second pot frame body that supports and fixes the vibrating film together with the first pot frame body, and a second positioning formed by the concave end of the second pot frame body close to the magnetic yoke a groove, wherein opposite ends of the groove bottom of the second positioning groove are recessed in a direction away from the magnetic yoke to form a second process gap;

The second basin frame body is sleeved on the side of the first basin frame body away from the magnetic circuit system, and the second positioning groove and the first positioning groove are completely perpendicular to the vibration direction of the diaphragm. Displacement arrangement, so that the second pot frame body completely covers the first process notch along the vibration direction perpendicular to the vibrating membrane and the first pot frame body completely covers the vibration direction perpendicular to the vibration direction. The second process gap;

The magnetic yoke comprises a magnetic yoke body, a first positioning wall and a second positioning wall respectively protruding and extending from the magnetic yoke body to the basin frame, the first positioning wall is matched with the first positioning groove and The second positioning wall cooperates with the second positioning groove to locate the relative position of the basin frame and the magnetic yoke.
The sound-generating device according to claim 1, wherein an end of the first pot frame body close to the diaphragm is flush with an end of the second pot frame body close to the diaphragm.
The sound-generating device according to claim 1, wherein a position of one end of the first basin body away from the vibrating membrane corresponding to the second positioning groove is flush with the groove bottom of the second positioning groove.
The sound-generating device according to claim 3, characterized in that, one end of the second pot frame body away from the vibrating membrane, corresponding to the position of the first positioning groove, completely covers the first locating groove and is perpendicular to the vibration direction positioning slot.
The sound-generating device according to claim 4, wherein the basin frame has a rectangular structure, the first positioning grooves include two and are respectively located on opposite sides of the first basin frame body, the second The positioning grooves include two and are respectively located on opposite sides of the second basin frame body, and the two first positioning grooves and the two second positioning grooves are respectively located on four sides of the basin frame.
The sound-generating device according to claim 5, wherein the groove bottom of the first positioning groove is closer to the diaphragm than the groove bottom of the second positioning groove; the second positioning wall comprises two They are respectively formed by two opposite sides of the yoke body extending perpendicular to the vibration direction, and the first positioning walls include two and are respectively formed by the other opposite sides of the yoke body toward the direction of the vibrating film. Bend to form.
The sound-generating device according to claim 1, wherein the diaphragm comprises a ring-shaped first ring portion, a second ring portion surrounding the first ring portion and arranged at intervals, and a ring-shaped ring portion. The magnetic steel unit includes a main magnetic steel fixed on the yoke, a secondary magnetic steel surrounding the main magnetic steel and spaced from the main magnetic steel to form the magnetic gap, and a secondary magnetic steel covered on the The main magnet is abutted and fixed on the magnetic bowl of the auxiliary magnet; the outer periphery of the second folded ring part is fixed on the basin frame, and the inner perimeter of the first folded ring part is fixed on the The magnetic bowl is away from the side of the secondary magnetic steel, and the magnetic steel unit is partially exposed to the diaphragm; the inner periphery of the spherical top is connected with the outer peripheral edge of the first folding ring part, and the spherical top The outer peripheral edge of the second folding ring is connected with the inner peripheral edge of the second folding ring.
The sound-generating device according to claim 7, wherein the vibration system further comprises a frame, one end of the frame is connected to the dome, the other end of which extends into the magnetic gap, and the voice coil is supported and fixed on the skeleton.
The sound-generating device according to claim 8, wherein the magnetic circuit system further comprises a fixing ring, and the fixing ring comprises a ring-shaped ring body sleeved on the peripheral side of the magnetic bowl, and the ring is formed by the ring. The end of the body away from the magnetic yoke is bent and extended inwardly. The basin frame, the diaphragm, the fixing ring, the magnetic bowl and the magnetic yoke together form the sounding inner cavity.
The sound-generating device according to claim 9, wherein the fixing ring further comprises a reinforcing wall extending from one end of the ring body close to the magnetic yoke, and the inner periphery of the first folding ring is along the reinforcing wall The wall is bent and extended to form an extension wall, and the extension wall is fitted and fixed to the reinforcing wall.