WO2022007170A1

WO2022007170A1 - Sound production device

Info

Publication number: WO2022007170A1
Application number: PCT/CN2020/114030
Authority: WO
Inventors: 钟志威; 金鑫
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技(新加坡)有限公司
Priority date: 2020-07-06
Filing date: 2020-09-08
Publication date: 2022-01-13
Also published as: CN213028531U

Abstract

The present utility model provides a sound production device, comprising a basket, a vibration system, and a magnetic circuit system. The vibration system comprises a diaphragm, a voice coil, and an elastic support assembly; the magnetic circuit system comprises a magnetic yoke, primary magnet steel, first secondary magnet steel, and second secondary magnet steel; the elastic support assembly comprises auxiliary diaphragms which are located at two opposite sides of the primary magnet steel, arranged opposite to the second secondary magnet steel at the same side, and spaced apart from the second secondary magnet steel; each auxiliary diaphragm comprises a first fixed portion connected to the basket, second fixed portions connected to the voice coil, and a surround portion respectively connecting the second fixed portions to the first fixed portion; a part of the surround portion located between the two second fixed portions is recessed in a direction away from the primary magnet steel and jointly defines, with the two second fixed portions, an accommodation space which is open toward the direction of the primary magnet steel; the second secondary magnet steel is housed in the accommodation space; the surface of the surround portion facing toward the accommodation space is a curved surface. Compared with the related art, the sound production device of the present utility model has high reliability.

Description

sound device

technical field

The utility model relates to the field of electro-acoustic conversion, in particular to a sound-emitting device used in electronic sound box products.

Background technique

With the advent of the mobile Internet era, the number of smart mobile devices continues to rise. Among many mobile devices, mobile phones are undoubtedly the most common and portable mobile terminal devices. At present, the functions of mobile phones are extremely diverse, one of which is the high-quality music function. Therefore, sound-generating devices for playing sound are widely used in smart mobile devices.

The sound-generating device of the related art includes a basin frame, a vibration system respectively fixed to the basin frame, and a magnetic circuit system having a magnetic gap. The vibration system includes a diaphragm fixed on the basin frame, a voice coil fixed on the diaphragm and inserted in the magnetic gap to drive the diaphragm to vibrate and produce sound, and a voice coil fixed on the basin frame and connected with the The voice coil is away from the elastic support component connected at one end of the diaphragm. The magnetic circuit system includes a magnetic yoke, a main magnetic steel fixed on the magnetic yoke, and a first auxiliary magnetic steel and a second secondary magnetic steel that are arranged around the main magnetic steel and spaced from the main magnetic steel to form the magnetic gap. Auxiliary magnetic steel, the first auxiliary magnetic steel is located on the long axis side of the main magnetic steel, and the second auxiliary magnetic steel is located on the short axis side of the main magnetic steel. The elastic support assembly includes an auxiliary diaphragm, and the auxiliary diaphragm includes a first fixed part connected to the basin frame, a second fixed part connected to the voice coil, and the second fixed part and the second fixed part respectively. The folded ring portion of the first fixing portion is recessed in a direction away from the main magnet steel to form an escape groove, and the second auxiliary magnet steel extends into the escape groove.

technical problem

However, in the sound-emitting device of the related art, because the escape groove is provided on the folded ring portion, the structure makes it possible that when the voice coil drives the When the auxiliary diaphragm vibrates, the swing amplitude along the short axis direction of the main magnetic steel is relatively large, which makes the reliability of the sounding device poor.

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

technical solutions

The purpose of the utility model is to provide a sound-emitting device with high reliability.

In order to achieve the above purpose, the present invention provides a sound-generating device, which includes a basin frame, a vibration system and a magnetic circuit system with a magnetic gap respectively fixed to the basin frame; the vibration system includes a vibration system fixed to the basin frame. a diaphragm, a voice coil inserted in the magnetic gap to drive the diaphragm to vibrate and sound, and an elastic support assembly fixed on the basin frame and connected with the voice coil; the magnetic circuit system includes a The magnetic yoke of the basin frame, the main magnetic steel fixed to the magnetic yoke, the two first auxiliary magnetic steels respectively located on opposite sides of the main magnetic steel, and the two first auxiliary magnetic steels respectively located on the other opposite sides of the main magnetic steel. Two second secondary magnetic steels, the first secondary magnetic steel and the second secondary magnetic steel are spaced apart from the main magnetic steel and together form the magnetic gap, and the elastic support component includes a an auxiliary diaphragm on opposite sides of the magnetic steel and on the same side of the second auxiliary magnetic steel and spaced apart from the second auxiliary magnetic steel; the auxiliary diaphragm includes a first fixed diaphragm connected to the basin frame part, two second fixing parts connected to the voice coil, and folded ring parts respectively connecting the two second fixing parts to the first fixing part, the folded ring parts are located in the two second fixing parts. The part between the two fixing parts is recessed in the direction away from the main magnet, and together with the two second fixing parts, forms an opening-shaped accommodating space toward the main magnet. The second auxiliary magnet The steel is accommodated in the accommodating space; the side of the folded ring portion facing the accommodating space is curved.

Preferably, the cross section of the side of the folded ring portion facing the accommodating space is in an arc-shaped structure that protrudes toward the main magnet steel.

Preferably, the cross section of the second secondary magnetic steel decreases gradually along the direction from the main magnetic steel to the auxiliary diaphragm, and the folded ring portion is concave toward the side away from the main magnetic steel. The shape matches the second secondary magnet.

Preferably, the main magnetic steel is rectangular, the two first auxiliary magnetic steels are respectively located on opposite sides of the long axis of the main magnetic steel, and the two second auxiliary magnetic steels are respectively located on the main magnetic steel opposite sides of the short axis.

Preferably, the elastic support components include two and are respectively located on opposite sides of the short axis of the main magnet steel.

Preferably, each of the elastic support components further includes an elastic member attached and fixed to a side of the elastic member close to the diaphragm, and the elastic member is connected to the voice coil.

Preferably, the elastic member includes a first fixing arm fixed on the basin frame and connected with the first fixing part, two second fixing arms fixed on the two second fixing parts, and two fixing arms respectively Each of the second fixed arms is connected to the two elastic arms of the first fixed arm.

Preferably, the vibration system further includes a skeleton connecting the voice coil and the elastic member support assembly, the skeleton includes a skeleton body fixed on the diaphragm, extending from the skeleton body to the voice coil and The first fixing part of the frame fixed to the voice coil and the second fixing parts of the four frames extending from the frame body to the second fixing arm and being fixed to the second fixing arm.

Preferably, the voice coil has a rectangular structure with rounded corners, the first fixing part of the skeleton is annular and is fixed on the end of the voice coil close to the diaphragm, and the four second fixing parts of the skeleton are respectively are arranged at the positions of the four rounded corners of the voice coil.

Preferably, the magnetic circuit system further includes an upper clamping plate, and the upper clamping plate includes a ring-shaped fixing ring fixed on the end of the basin frame away from the vibrating membrane, and the first auxiliary magnetic Two first secondary pole cores extending from steel and two second secondary pole cores extending from the fixing ring to the second secondary magnetic steel, the two first secondary pole cores are respectively stacked and fixed on two The first auxiliary magnetic steel and the two second auxiliary pole cores are respectively stacked and fixed on the two second auxiliary magnetic steels; the first fixing arm is fixed on the end of the fixing ring away from the diaphragm .

beneficial effect

Compared with the related art, in the sound-emitting device of the present invention, the part of the folded ring part of the auxiliary diaphragm located between the two second fixing parts is concave in the direction away from the main magnet steel and is jointly enclosed with the two second fixing parts. The accommodating space is open in the direction of the main magnet, the accommodating space is used for accommodating the second secondary magnet, and the side of the folded ring portion facing the accommodating space is set as a curved surface, that is, the part of the folded ring portion facing the accommodating space is set as Semi-closed surface. The curved surface provided in this part of the folded ring part is beneficial to reduce the height of the folded ring part, so that the auxiliary diaphragm can increase the two diameters along the short axis direction of the main magnet without affecting the large-scale longitudinal vibration state. The traction force between the second fixing parts increases the effect of suppressing the short-axis swinging ability of the voice coil, so that the reliability of the sound-emitting device is high.

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 drawings in the following description are only some implementations of the present invention. For example, 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 stereoscopic 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 a sectional view along line A-A in Fig. 1;

4 is an exploded view of the three-dimensional structure of the elastic support assembly of the sound-emitting device of the present invention;

5 is a schematic three-dimensional structure diagram of the auxiliary diaphragm of the sound-emitting device of the present invention;

6 is a cross-sectional view along line B-B in FIG. 5;

7 is a schematic diagram of the assembled three-dimensional structure of the demagnetizing yoke of the sound-emitting device of the present invention;

8 is a schematic diagram of the assembled three-dimensional structure of the elastic support component, the voice coil and the skeleton of the sound-emitting device of the present invention.

Embodiments of the present invention

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, but not all of them. Example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Please refer to FIGS. 1-8 at the same time, the present invention provides a sound-generating device 100, the sound-generating device 100 includes a basin frame 1, a vibration system 2 and a magnetic circuit system 3 respectively supported on the basin frame 1, and the magnetic The circuit system 3 has a magnetic gap 30, and the magnetic circuit system 3 drives the vibration system 2 to vibrate and emit sound.

The basin frame 1 is used to fix the vibration system 2 and the magnetic circuit system 3 .

The vibration system 2 includes a diaphragm 21 fixed on the basin frame 1 , a voice coil 22 inserted in the magnetic gap 30 to drive the diaphragm 21 to vibrate and produce sound, and a voice coil 22 fixed on the basin frame 1 and connected with it. The elastic support component 23 to which the voice coil 22 is connected.

The magnetic circuit system 3 includes a magnetic yoke 31 fixed to the basin frame 1 , a main magnetic steel 32 fixed to the magnetic yoke 31 , and two first auxiliary magnetic steels located on opposite sides of the main magnetic steel 32 respectively. The steel 33 and the two second secondary magnets 34 located on the other opposite sides of the main magnet 32 respectively. The first secondary magnetic steel 33 and the second secondary magnetic steel 34 are spaced apart from the main magnetic steel 32 and together form the magnetic gap 30 .

The elastic support assembly 23 includes auxiliary diaphragms 231 located on opposite sides of the main magnetic steel 32 and opposite to the second auxiliary magnetic steel 34 on the same side and spaced from the second auxiliary magnetic steel 34 .

The auxiliary diaphragm 231 includes a first fixing portion 2311 , a second fixing portion 2312 and a folding ring portion 2313 .

The first fixing portion 2311 is connected to the basin frame 1 .

The second fixing portion 2312 includes two. The two second fixing parts 2312 are connected to the voice coil 22 for the voice coil 22 to drive the auxiliary diaphragm 231 to vibrate.

The folding ring portions 2313 respectively connect the two second fixing portions 2312 to the first fixing portions 2311 . Wherein, the cross-section of the folded ring portion 2313 is an arc-shaped structure that is convex or concave toward the direction of the diaphragm 21 .

The portion of the folded ring portion 2313 located between the two second fixing portions 2312 is recessed in a direction away from the main magnet 32 and together with the two second fixing portions 2312 to form a direction toward the main magnet The accommodating space 230 is open in the direction of the steel 32 . Wherein, the second auxiliary magnetic steel 34 is accommodated in the accommodating space 230 . That is to say, the second secondary magnetic steel 34 extends into the accommodating space 230 , thereby maximizing the magnetic field of the magnetic circuit system 3 , so that the acoustic performance of the sounding device 100 is excellent.

In this embodiment, the cross section of the second secondary magnetic steel 34 decreases gradually from the main magnetic steel 32 to the auxiliary diaphragm. The shape of the recess of the folded ring portion 2313 to the side away from the main magnetic steel 32 matches the shape of the second auxiliary magnetic steel 34 . This structure enables the volume of the second secondary magnetic steel 34 to be designed to be larger, and maximizes the magnetic field of the magnetic circuit of the magnetic circuit system 3 , so that the acoustic performance of the sound-emitting device 100 is excellent.

A surface of the ring portion 2313 facing the accommodating space 230 is curved. In this embodiment, the cross section of the side of the folded ring portion 2313 facing the accommodating space 230 has an arc structure that protrudes toward the main magnet steel 32 . That is, the portion of the folded ring portion 2313 facing the accommodating space 230 is set as a semi-closed curved surface. The curved surface of the folded ring portion 2313 is beneficial to reduce the height of the folded ring portion 2313, so that the auxiliary diaphragm 231 can increase along the main magnetic field without affecting the large-scale longitudinal vibration state. The traction force between the two second fixing parts 2312 in the short-axis direction of the steel 32 enhances the ability to restrain the short-axis swing of the voice coil 22 and makes the sound-emitting device 100 highly reliable.

In this embodiment, the auxiliary diaphragm 231 is made of a polymer material, for example, at least one of polymer materials such as silicone, rubber, PEEK, PEL, and TPU. Of course, the material for making the auxiliary diaphragm 231 is not limited to this.

In this embodiment, the elastic support components 23 include two and are respectively located on opposite sides of the short axis of the main magnet 32 . The arrangement of the two elastic support assemblies 23 forms a symmetrical structure, so that the support effect of the two elastic support assemblies 23 on the voice coil 22 is more stable, and the anti-voice coil 22 has a better lateral swing effect.

In this implementation, each of the elastic support components 23 further includes an elastic member 232 that is fitted and fixed to the elastic member 232 on the side close to the vibrating membrane 21 . The elastic member 232 is connected with the voice coil 22 . The auxiliary diaphragm 231 is indirectly connected to the voice coil 22 through the elastic member 232 .

Specifically, the elastic member 232 is a flexible circuit board, and the voice coil 22 is electrically connected to the elastic member 232 . On the one hand, it is used to provide support for the voice coil 22; its reliability.

The elastic member 232 includes a first fixing arm 2321 fixed to the basin frame 1 and connected to the first fixing portion 2311 , two second fixing arms 2322 fixed to the two second fixing portions 2312 , and The two second fixing arms 2322 are respectively connected to the two elastic arms 2323 of the first fixing arm 2321 .

Wherein, each of the second fixing portions 2312 and the adjacent one of the second fixing arms 2322 are attached and fixed to form an integral structure, which has a more stable supporting effect on the voice coil 22, and this structure restrains the voice coil 22 from swaying. the best ability. To sum up the above, in this structure, the elastic support assembly 23 does not affect the magnetic gap 30, and the design of the magnetic circuit system is optimized, so that the acoustic performance of the sound-emitting device 100 is better, and the elastic support assembly 23 is easy to improve. The stability of the vibration system 2 .

The vibration system 2 further includes a frame 24 connecting the voice coil 22 and the elastic support assembly 23 . In this embodiment, the frame 24 includes a frame body 241 fixed to the diaphragm 21 , a frame first fixing portion 242 extending from the frame body 241 to the voice coil 22 and fixed to the voice coil 22 . and the four frame second fixing portions 243 extending from the frame body 241 to the second fixing arm 2322 and being fixed to the second fixing arm 2322 . The voice coil 22 is connected to the frame 24 ; the frame 24 is connected to the second fixed arm 2322 of the elastic member 232 ; the second fixed arm 2322 is connected to the second fixed arm 2322 of the auxiliary diaphragm 231 The two fixing parts 2312 are connected. This structure enables the auxiliary diaphragm 231 to form an indirect connection with the voice coil 22 .

In this embodiment, the voice coil 22 has a rectangular structure with rounded corners. The first fixing portion 242 of the frame is annular and is fixed to an end of the voice coil 22 close to the diaphragm 21 . The four second fixing portions 243 of the skeleton are respectively disposed at the four rounded corners of the voice coil 22 . Wherein, the two second fixing parts 2312 are respectively fixed to the short side of the same voice coil 22, and this structure makes the arrangement of the two second fixing parts 2312 form a symmetrical structure, so that the two elastic The supporting effect of the support assembly 23 on the voice coil 22 is more stable, and the effect of preventing the voice coil 22 from swinging laterally is better.

In this embodiment, the main magnetic steel 32 is rectangular. The two first secondary magnetic steels 33 are respectively located on opposite sides of the long axis of the main magnetic steel 32 , and the two second secondary magnetic steels 34 are respectively located on opposite sides of the short axis of the main magnetic steel 32 .

In this embodiment, in order to make the magnetic field more balanced, the magnetic circuit system 3 further includes a main pole core 35 fixed to the main magnetic steel 32 and close to the vibration system 2 side. The main pole core 35 The projection to the main magnetic steel 32 along the vibration direction of the diaphragm 21 completely coincides with the main magnetic steel 32 . That is to say, the shape of the main pole core 35 is the same as the shape of the main magnetic steel 32 , so that the main magnetic steel 32 is added to the first auxiliary magnetic steel 33 and the second auxiliary magnetic steel 34 respectively. the strength of the magnetic field that forms the magnetic gap 30 .

In order to further improve the performance of the magnetic circuit system 3, as many magnetic lines of force of the magnetic circuit system 3 are cut as possible by the voice coil 22 to form a larger space for the magnetic circuit of the driving force, the magnetic circuit system 3 Also includes an upper splint 36, the upper splint 36 includes a ring-shaped fixing ring 361 fixed on the basin frame 1, and two first pair extending from the fixing ring 361 to the first auxiliary magnet 33. The pole core 362 and the two second auxiliary pole cores 363 extending from the fixing ring 361 to the second auxiliary magnetic steel 34, the two first auxiliary pole cores 362 are respectively stacked and fixed on the two second auxiliary pole cores. For one pair of magnetic steels 33 , the two second auxiliary pole cores 363 are respectively stacked and fixed on the two second auxiliary magnetic steels 34 . Since the fixing ring 361 is fixed to the basin frame 1 , the main magnetic steel 32 and/or the first secondary pole core 362 and the second secondary magnetic steel 34 are fixed to the The basin frame 1 is used to fix the magnetic circuit system to the basin frame 1 . The first fixing arm 2321 is fixed to the end of the fixing ring 361 away from the diaphragm 21 . This structure enables the elastic support assembly 23 to be fixed to the basin frame 1 through the fixing ring 361 .

The above are only the embodiments of the present utility model. 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 utility model, but these belong to The scope of protection of the utility model.

Claims

A sounding device includes a basin frame, a vibration system and a magnetic circuit system with a magnetic gap respectively fixed on the basin frame; a voice coil for driving the diaphragm to vibrate and sound with a gap, and an elastic support assembly fixed on the basin frame and connected with the voice coil; the magnetic circuit system includes a magnetic yoke fixed on the basin frame, a The main magnetic steel of the yoke, the two first auxiliary magnetic steels located on opposite sides of the main magnetic steel, and the two second auxiliary magnetic steels respectively located on the other opposite sides of the main magnetic steel, the The first secondary magnetic steel and the second secondary magnetic steel are spaced apart from the main magnetic steel and together form the magnetic gap. The two pairs of magnetic steels are auxiliary diaphragms arranged opposite to each other on the same side and spaced apart from the second auxiliary magnetic steels; The two second fixing parts of the voice coil and the folded ring parts respectively connecting the two second fixing parts to the first fixing part, the folded ring parts being located between the two second fixing parts Part of it is recessed in the direction away from the main magnetic steel, and together with the two second fixing parts, forms an opening-shaped accommodating space toward the main magnetic steel, and the second auxiliary magnetic steel is accommodated in the accommodating space. space; the side of the folded ring portion facing the accommodating space is curved.
The sound-generating device according to claim 1, wherein the cross section of the side of the folded ring portion facing the accommodating space has an arc-shaped structure that protrudes toward the main magnet steel.
The sound-generating device according to claim 1, wherein the cross section of the second secondary magnetic steel decreases gradually along the direction from the main magnetic steel to the auxiliary diaphragm, and the ring portion is directed toward the auxiliary diaphragm. The shape of the recess on the side away from the main magnet matches the second secondary magnet.
The sound-emitting device according to claim 1, wherein the main magnetic steel is rectangular, the two first auxiliary magnetic steels are respectively located on opposite sides of the long axis of the main magnetic steel, and the two first auxiliary magnetic steels are respectively located on opposite sides of the long axis of the main magnetic steel. The secondary magnetic steels are respectively located on opposite sides of the short axis of the main magnetic steel.
The sound-generating device according to claim 4, wherein the elastic support components comprise two and are respectively located on opposite sides of the short axis of the main magnet steel.
The sound-generating device according to claim 5, wherein each of the elastic support components further comprises an elastic member attached and fixed to a side of the elastic member close to the diaphragm, the elastic member is connected to the elastic member. Voice coil connection.
The sounding device according to claim 6, wherein the elastic member comprises a first fixing arm fixed on the basin frame and connected with the first fixing part, and a first fixing arm fixed on the two second fixing parts and two elastic arms respectively connecting the two second fixing arms to the first fixing arm.
The sound-generating device according to claim 7, wherein the vibration system further comprises a skeleton connecting the voice coil and the elastic member support assembly, the skeleton comprising a skeleton body fixed on the vibrating membrane, consisting of The skeleton body extends toward the voice coil and is fixed to the first fixing part of the skeleton of the voice coil, and the four skeletons extend from the skeleton body to the second fixing arm and are fixed to the second fixing arm the second fixed part.
The sound-generating device according to claim 8, wherein the voice coil has a rectangular structure with rounded corners, and the first fixing portion of the skeleton is annular and is fixed to an end of the voice coil close to the diaphragm , the four second fixing parts of the skeleton are respectively arranged at the positions of the four rounded corners of the voice coil.
The sound-generating device according to claim 7, wherein the magnetic circuit system further comprises an upper clamping plate, and the upper clamping plate comprises a ring-shaped fixing ring fixed to the end of the basin frame away from the vibrating membrane, The two first secondary pole cores extending from the fixed ring to the first secondary magnetic steel and the two second secondary pole cores extending from the fixed ring to the second secondary magnetic steel, two of the first secondary pole cores. A secondary pole core is respectively stacked and fixed on the two first secondary magnetic steels, and the two second secondary polar cores are respectively stacked and fixed on the two second secondary magnetic steels; the first fixing arm is fixed at the end of the fixing ring away from the diaphragm.