WO2021232454A1

WO2021232454A1 - Sound generation device

Info

Publication number: WO2021232454A1
Application number: PCT/CN2020/092465
Authority: WO
Inventors: 肖波; 令狐荣林
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: 2020-05-20
Filing date: 2020-05-27
Publication date: 2021-11-25
Also published as: CN111641903B; CN111641903A

Abstract

Provided is a sound generation device comprising a housing having an accommodating space, a vibration system accommodated inside the accommodating space and a magnetic circuit system that drives the vibration system to vibrate. By arranging a first hole and a second hole respectively on an upper clamping plate and a main magnetic steel assembly of the magnetic circuit system, and using a positioning block to penetrate and fix the first hole and the second hole, the magnetic circuit system can be positioned and fixed during the assembly and sound generation process of the sound generation device. The stability and reliability of the sound generation device are enhanced, and the acoustic performance and service life of the sound generation device are significantly improved.

Description

A sounding device

Technical field

The present invention relates to the field of acoustic-electric conversion, in particular to a sound-producing device.

Background technique

With the development of technology, more and more electronic devices have built-in sound generating devices. Generally, the speaker will provide a uniform magnetic field through the magnetic steel, so that the voice coil with alternating current will vibrate in the uniform magnetic field, and the voice coil will drive the diaphragm to vibrate to make the speaker produce sound. In the assembly process of the prior art sound device and the vibration and sound production process, the magnetic circuit system is prone to shift, resulting in movement around the vibration direction of the diaphragm, such as deflection, rotation, and movement. The structure is not firm, which affects the stability of the sound device performance. Therefore, it is necessary to provide a sounding device to solve the above-mentioned defects.

technical problem

The object of the present invention is to provide a sound emitting device, which includes an upper clamping plate having a first hole portion, a main magnetic steel assembly having a corresponding second hole portion, and penetrating the first hole portion and the second hole portion The positioning block to solve the above-mentioned defects in the prior art.

Technical solutions

The technical solution of the present invention is as follows: the present invention provides a sound emitting device, the sound emitting device includes a housing with an accommodating space, and a vibration system and a vibration system fixed on the housing and placed in the accommodating space. A magnetic circuit system for driving the vibration system to vibrate;

The magnetic circuit system includes an upper clamping plate abutting against the top wall of the casing and a main magnetic steel component located in a direction of the upper clamping plate away from the top wall of the casing;

A first hole is penetrated on the upper clamping plate, a second hole connected to the first hole is opened on the main magnetic steel assembly, and the sound-generating device further includes the first hole and The positioning block in the second hole.

Preferably, the upper splint includes a top plate and a side wall bent and extended along the edge of the top plate toward the accommodating space, and the center of the top plate is provided with the first hole.

Preferably, a relief portion is provided on the top wall of the housing, and the upper clamping plate is partially embedded in the relief portion.

Preferably, the second hole portion and the first hole portion cooperate to form a cylindrical hole, and the positioning block is cylindrical and matches the cylindrical hole.

Preferably, the main magnet assembly includes a first main magnet abutting against the upper clamping plate, a second main magnet far away from the upper clamping plate, and a second main magnet sandwiched between the first main magnet and the first main magnet. The main pole core between the two main magnets, the second hole penetrates the main pole core and the first main magnet, and the first hole has a rectangular shape and is provided in the first main magnet The second hole on the upper part is circular, and the second hole provided on the pole core is rectangular.

Preferably, the housing includes a front cover, a middle frame, and a rear cover that are sequentially arranged along the vibration direction of the vibration system,

The vibration system includes a first diaphragm sandwiched between the front cover and the middle frame, a second diaphragm sandwiched between the middle frame and the back cover, and,

A diaphragm arranged at intervals between the first diaphragm and the second diaphragm, the diaphragm is ring-shaped and arranged at intervals around the magnetic circuit system, and the outer peripheral side of the diaphragm is connected to the middle frame,

A skeleton component sleeved outside the magnetic circuit system and connected with the first diaphragm, the second diaphragm, and the diaphragm,

A voice coil sleeved outside the main magnetic steel component and connected with the skeleton component,

The first diaphragm and the front cover are enclosed to form a first diaphragm front cavity, and the diaphragm, the middle frame, the second diaphragm, and the skeleton assembly are enclosed to form a second diaphragm front cavity ,

The voice coil drives the second diaphragm to vibrate, and at the same time drives the skeleton assembly to drive the first diaphragm to vibrate; wherein the front cover is provided with a first sound outlet, and the middle frame is provided with The second sound hole.

Preferably, the frame assembly includes an upper frame abutting against the first diaphragm and a lower frame abutting against the second diaphragm;

The lower frame includes a first frame-shaped body holding the second diaphragm and a fixed support part extending from the first frame-shaped body to abutting the voice coil,

The upper frame includes a second frame-shaped body holding the first diaphragm and a connecting portion extending from the second frame-shaped body toward the lower frame, and the connecting portion abuts against the fixed support portion.

Preferably, the inner peripheral side of the diaphragm is sandwiched between the upper frame and the lower frame, and a cushion edge is also sandwiched between the diaphragm and the lower frame.

Preferably, the vibration system further includes a flexible circuit board sandwiched between the second diaphragm and the lower frame, and the flexible circuit board is electrically connected to the voice coil.

Preferably, the magnetic circuit system further includes a secondary magnetic steel component arranged around the main magnetic steel component and a lower splint arranged on the back cover and opposite to the upper splint. The main magnetic steel component and the The auxiliary magnetic steel component is arranged on the lower clamping plate, a magnetic gap is provided between the auxiliary magnetic steel component and the main magnetic steel component, and the voice coil is arranged in the magnetic gap.

Preferably, the first diaphragm includes a first upper sound diaphragm connected to the upper frame, and a spacer is sleeved outside the first upper sound diaphragm and sandwiched between the front cover and the middle frame The second upper sound film and the first dome connecting the first upper sound film and the second upper sound film, the first upper sound film and the second upper sound film include facing the top wall Raised fold ring part.

Preferably, the second diaphragm includes a lower sound diaphragm sandwiched between the back cover and the middle frame and a second dome connecting the lower frame and the lower sound diaphragm. The film includes a folding ring portion recessed toward the back cover.

Beneficial effect

The beneficial effect of the present invention is that the present invention provides the corresponding first hole and second hole on the upper clamping plate and the main magnetic steel assembly, and uses the positioning block to penetrate and fix the first hole and the second hole. Realizing the positioning and fixing of the magnetic circuit system in the process of assembling and sounding the sounding device is beneficial to improve the stability and reliability of the sounding device, and can significantly improve the acoustic performance and service life of the sounding device.

Description of the drawings

FIG. 1 is a schematic diagram of the overall structure of a sound emitting device provided by an embodiment of the present invention;

FIG. 2 is a schematic diagram of an exploded structure of the first part of the sound emitting device of FIG. 1;

3 is a schematic diagram of the exploded structure of the second part of the sound emitting device of FIG. 1;

Fig. 4 is a cross-sectional view of the sound emitting device of Fig. 1 along the A-A direction;

Figure 5 is a partial exploded view of the magnetic circuit system in Figure 2;

Fig. 6 is a structural diagram of the frame assembly and the voice coil in Fig. 2.

Brief description of the drawings: front cover 1; top wall 11; first sound hole 12; give way 13; middle frame 2; frame 21; extension 22; second sound hole 23; rear cover 3; bottom wall 31 Magnetic circuit system 4; upper splint 41; top plate 411; side wall 412; first hole 413; main magnet assembly 42; first main magnet 421; main pole core 422; second main magnet 423; auxiliary magnet Steel component 43; first auxiliary magnet 431; auxiliary pole core 432; second auxiliary magnet 433; second hole 44; magnetic gap 45; positioning block 46; lower splint 47; vibration system 5; voice coil 51; skeleton Component 52; lower frame 521; first frame-shaped body 5211; fixed support portion 5212; upper frame 522; second frame-shaped body 5221; joint 5222; opening 5223; cushion 523; first diaphragm 53; first Upper sound film 531; first dome 532; second upper sound film 533; diaphragm 54; second diaphragm 55; lower sound film 551; second dome 552; flexible circuit board 56; first folding ring part a; The second folding ring b.

Embodiments of the present invention

The present invention will be further described below in conjunction with the drawings and embodiments.

Please refer to FIGS. 1 to 4, which respectively show the overall structure diagram, the first part exploded view, the second part exploded view, and the cross-sectional view along the A-A direction of the sound generating device 100 according to the embodiment of the present invention. The sound generating device 100 includes a housing with an accommodating space, and a magnetic circuit system 4 and a vibration system 5 housed in the accommodating space. The magnetic circuit system 4 is arranged in the center of the accommodating space, and the vibration system 5 is arranged around the magnetic circuit system 4 , The magnetic circuit system 4 drives the vibration system 5 to vibrate to produce sound.

1 to 4, the housing includes a rear cover 3, a middle frame 2, and a front cover 1, which are sequentially stacked along the vibration direction of the vibration system 5 to form an accommodating space. The rear cover 3 includes a bottom wall 31; the middle frame 2 includes The frame body 21 and the extension 22 extending from the frame body 21 toward the magnetic circuit system 4; Butt to form an outer wall. Wherein, the top wall 11, the outer wall, and the bottom wall 31 surround and form a housing space of the housing. A relief portion 13 is provided in the center of the top wall 11.

Please refer to Figures 2 to 5, the magnetic circuit system 4 includes a lower splint 47 arranged in the center of the bottom wall 31, a main magnet assembly 42 arranged on the lower splint 47, a secondary magnet assembly 43 and Part of it is embedded in the upper clamping plate 41 at the relief portion 13. Optionally, the secondary magnetic steel assembly 43 may also be an annular shape integrally formed around the main magnetic steel assembly 42, or it may be surrounded by 4 sets of secondary magnetic steel assemblies 43 into a ring shape, or may be surrounded by two sets of secondary magnetic steel assemblies 43. Synthetic ring. In this embodiment, the secondary magnetic steel assembly 43 is provided in 4 groups, which are surrounded by the main magnetic steel assembly 42 at intervals, and a magnetic gap 45 is formed between the main magnetic steel assembly 42 and the main magnetic steel assembly 42. The main magnet assembly 42 includes a first main magnet 421 abutting against the upper clamping plate 41, a second main magnet 423 abutting against the lower clamping plate 47, and sandwiched between the first main magnet 421 and the second main magnet 423 Between the main pole core 422. The sub-magnet assembly 43 includes a first sub-magnet 431 abutting on the upper clamping plate 41, a second sub-magnet 433 abutting on the lower clamping plate 47, and sandwiched between the first sub-magnet 431 and the second sub-magnet 433 Between the sub-pole core 432. The upper clamping plate 41 includes a top plate 411 and a side wall 412 extending along the edge of the top plate 411 toward the accommodating space. The top plate 411 is embedded in the recess 13. Wherein, the first main magnet 421 abuts against the top plate 411, and the first auxiliary magnet 431 in each group of auxiliary magnet assembly 43 is opposite to the side wall 412. The top plate 411 is provided with a first hole 413 in the center, the main magnet assembly 42 is provided with a second hole 44 corresponding to the first hole 413, and the magnetic circuit system 4 also includes a through first hole 413 and a second hole. 44's positioning block 46. The second hole 44 penetrates the main pole core 422 and the first main magnet 421, the second hole 44 and the first hole 413 cooperate to form a cylindrical hole, and the positioning block 46 is cylindrical and matches the cylindrical hole. In an alternative embodiment, the first hole portion 413 is rectangular, the second hole portion provided on the first main magnet 421 is circular, and the second hole portion provided on the pole core 422 is rectangular. Through the cooperation of the positioning block 46 with the first hole portion 413 and the second hole portion 44, the displacement of the magnetic circuit system 4 can be prevented during the process of assembling and vibrating sound of the sound emitting device 100, resulting in deflection and deflection around the vibration direction of the diaphragm. Movements such as rotation and movement.

1 to 4, the vibration system 5 includes a first diaphragm 53 sandwiched between the front cover 1 and the middle frame 2, and a second diaphragm 55 sandwiched between the middle frame 2 and the back cover 3. And, the diaphragm 54 is arranged at intervals between the first diaphragm 53 and the second diaphragm 55, the diaphragm 54 is ring-shaped and is arranged at intervals around the magnetic circuit system 4, and the outer peripheral side of the diaphragm 54 is connected to the middle frame 2 and sleeved in The frame component 52 outside the magnetic circuit system 4 and connected to the first diaphragm 53, the second diaphragm 55, and the diaphragm 54 is sleeved on the main magnetic steel component 42 and connected to the voice coil 51 of the frame component 52. The first vibration The diaphragm 53 and the front cover 1 enclose the first diaphragm front cavity. The diaphragm 54 and the middle frame 2, the second diaphragm 55 and the skeleton assembly 52 enclose the second diaphragm front cavity. The accommodating space removes the first diaphragm. Outside the front cavity of the diaphragm and the front cavity of the second diaphragm, the remaining space is the back cavity of the sound emitting device 100. In this embodiment, the voice coil 51 drives the second diaphragm 55 to vibrate, and at the same time drives the skeleton assembly 52 to drive the first diaphragm 53 to vibrate; in other embodiments, the voice coil may also drive the first diaphragm to vibrate, and at the same time Drive the skeleton assembly to drive the second diaphragm to vibrate, or the voice coil can simultaneously drive the first diaphragm and the second diaphragm to vibrate. The front cover 1 is provided with a first sound hole 12, and the middle frame 2 is provided with a second出音孔23。 The sound hole 23.

Please refer to FIGS. 2 to 4 and 6, the skeleton assembly 52 includes a lower skeleton 521 connected to the second diaphragm 55 and close to the bottom wall 31, and an upper skeleton 522 abutting against the first diaphragm 53 and close to the top wall 11. The lower frame 521, the pad 523, and the upper frame 522 are sequentially sleeved outside the auxiliary magnetic steel assembly 43 along the vibration direction. The lower frame 521 includes a first frame-shaped main body 5211 connected to the second diaphragm 55 and a fixed support portion 5212 extending along the bottom of the first frame-shaped main body 5211 to abut the voice coil 51. The upper frame 522 includes a second frame-shaped main body 5221 that abuts against the first diaphragm 53 and a joint portion 5222 extending along the second frame-shaped main body 5221 to the lower frame 521. The joint portion 5222 and the fixed support portion 5212 cooperate and abut, such as The fixed support portion 5212 shown in the figure extends from the four frame corners of the first frame-shaped body 5211 to the voice coil 51, and the voice coil 51 is fixed. Extending and matching and abutting with the fixed support portion 5212 can increase the vibration stability of the sound emitting device 100. The voice coil 51 in the sound generating device 100 drives the skeleton assembly 52 to vibrate, and the skeleton assembly 52 drives the first diaphragm 53 and the second diaphragm 55 to vibrate simultaneously, thereby realizing a double diaphragm vibration sounding structure. The first diaphragm 53 and the second diaphragm 55 together form a double-diaphragm vibration sounding structure, which effectively increases the effective vibration area (SD) of the diaphragm of the vibration system 5, and improves the sounding loudness of the sounding device 100, thereby making the sounding device The acoustic performance of 100 is excellent. In addition, while increasing the effective vibration area (SD) of the diaphragm of the sound emitting device 100, the space utilization rate inside the sound device 100 is effectively improved, that is, when the effective diaphragm area (SD) of the sound emitting device 100 is the same, The size of the sound generating device 100 can be made smaller, which is beneficial to the development of miniaturization. On the basis of the above embodiments, preferably, a cushion 523 is provided between the second frame-shaped main body 5221 and the first frame-shaped main body 5211. The cushion 523 is a frame-shaped combined body, which can strengthen the first frame-shaped main body 5211 and the first frame-shaped main body 5211. The bonding part of the two frame-shaped main bodies 5221 makes the bonding part stronger. The second frame-shaped main body 5221 of the upper frame 522 is further provided with a plurality of openings 5223, and the openings 5223 are provided to communicate with the rear cavity in the accommodating space.

Please refer to Fig. 2 to Fig. 4. Optionally, the first diaphragm 53 may be a complete sound diaphragm, or the sound diaphragm may be matched with the dome. In this embodiment, the first diaphragm 53 includes a first upper sound diaphragm 531 sandwiched between the first auxiliary magnetic steel 431 and the upper clamping plate 41, and a spacer sleeve is sleeved outside the first upper sound diaphragm 531 and sandwiched between The second upper sound film 533 between the front cover 1 and the middle frame 2 and the first dome 532 connecting the first upper sound film 531 and the second upper sound film 533. The first upper sound film 531 is sleeved outside the first sub-magnet 431, the first dome 532 is in the shape of a plate with an opening in the center, and the magnetic circuit system 4 is provided in the opening. Both the first upper sound film 531 and the second upper sound film 533 include a first folding ring portion a protruding toward the front cover 1.

Please refer to FIGS. 3 and 4. Optionally, the second diaphragm 55 may be a complete sound diaphragm, or the sound diaphragm may be matched with the dome. In this embodiment, the second diaphragm 55 is arranged around the magnetic circuit system 4, and the second diaphragm 55 includes a lower sound diaphragm 551 sandwiched between the middle frame 2 and the back cover 3, and a lower sound diaphragm 551 connected with the lower sound diaphragm 551. The second dome 552 of the skeleton 521. The second dome 552 is in the shape of a plate with an opening in the middle. The second dome 552 is arranged around the magnetic circuit system 4, and the magnetic circuit system 4 extends from the opening. The lower sound film 551 includes a second folding ring recessed toward the bottom wall 31 Section b.

Please refer to Figures 2 to 4, the diaphragm 54 is arranged around the magnetic circuit system 4, the outer circumferential side of the diaphragm 54 is connected with the extension 22, the inner circumferential side of the diaphragm 54 is sandwiched between the upper frame 522 and the lower frame 521, the diaphragm 54 includes A middle portion protruding toward the first diaphragm 53. The diaphragm 54 separates the back cavity from the front cavity of the second diaphragm 55, which avoids acoustic short circuit in the sound emitting device 100.

Referring to FIGS. 3 and 4, the vibration system 5 further includes a flexible circuit board 56 arranged between the lower sound membrane 551 and the lower frame 521, and the flexible circuit board 56 is electrically connected to the voice coil 51.

The sound generation principle of the sound generating device 100 of the embodiment of the present invention is: the vibration system 5 is provided with a first vibration film 53 and a second vibration film 55 that emit sound by vibration, and the first vibration film 53 and the second vibration film 55 together constitute the vibration system 5 With a dual-diaphragm structure, in the magnetic circuit system 4, the voice coil 51 with an alternating current vibrates under the action of a uniform magnetic field, and the voice coil 51 drives the skeleton assembly 52 to vibrate, thereby driving the first diaphragm 53 and the second vibration The diaphragm 55 vibrates at the same time, so that the first diaphragm 53 and the second diaphragm 55 respectively pass through the first diaphragm front cavity and the second diaphragm front cavity and share the same rear cavity. This structure effectively improves the diaphragm of the vibration system 5 The effective vibration area (SD) improves the sounding loudness of the sound-producing device, so that the sound-producing device has excellent acoustic performance. In the sound generating device 100 of the present invention, the upper clamping plate 41 and the main magnetic steel assembly 42 are respectively provided with corresponding first hole portions 413 and second hole portions 44, and the positioning block 46 is used to penetrate and fix the first hole portion 413 and the second hole. The part 44 can realize the positioning and fixing of the magnetic circuit system 4 during the assembly and sound production of the sound emitting device 100, which is beneficial to improve the stability and reliability of the sound emitting device 100, and can significantly improve the acoustic performance and service life of the sound emitting device 100.

The above are only the embodiments of the present invention. It should be pointed out here 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 all belong to the present invention. The scope of protection.

Claims

1. A sound emitting device, characterized in that the sound emitting device comprises a housing with an accommodating space, a vibration system fixed on the housing and placed in the accommodating space, and a vibration system for driving the Vibration system vibrating magnetic circuit system;

2. The sounding device according to claim 1, wherein the upper clamping plate comprises a top plate, a side wall bent and extended along the edge of the top plate toward the accommodation space, and the center of the top plate is provided with the first A hole department.

3. The sound emitting device according to claim 1 or 2, characterized in that a relief portion is provided on the top wall of the housing, and the upper clamping plate is partially embedded in the relief portion.

4. The sound emitting device according to claim 1, wherein the second hole portion and the first hole portion cooperate to form a cylindrical hole, and the positioning block is in the shape of a column and corresponds to the cylindrical hole. match.

5. The sounding device according to claim 1, wherein the main magnet assembly comprises a first main magnet abutting against the upper splint, a second main magnet far away from the upper splint, and a clamp A main pole core provided between the first main magnet and the second main magnet, the second hole penetrates the main pole core and the first main magnet, and the first hole The portion is rectangular, the second hole portion provided on the first main magnet is circular, and the second hole portion provided on the pole core is rectangular.

6. The sound generating device according to claim 3, wherein the housing comprises a front cover, a middle frame and a rear cover which are sequentially arranged along the vibration direction of the vibration system,

7. The sound generating device according to claim 6, wherein the frame assembly comprises an upper frame abutting against the first diaphragm and a lower frame abutting against the second diaphragm;

8. The sounding device according to claim 7, wherein the inner peripheral side of the diaphragm is sandwiched between the upper frame and the lower frame, and the diaphragm and the lower frame are also sandwiched between With cushions.

9. The sounding device according to claim 7, wherein the vibration system further comprises a flexible circuit board sandwiched between the second diaphragm and the lower frame, and the flexible circuit board is connected to the The voice coil is electrically connected.

10. The sounding device according to claim 6, wherein the magnetic circuit system further comprises a secondary magnetic steel component arranged around the main magnetic steel component, and a secondary magnetic steel component arranged on the back cover and opposite to the upper splint. The main magnetic steel component and the auxiliary magnetic steel component are arranged on the lower splint, a magnetic gap is provided between the auxiliary magnetic steel component and the main magnetic steel component, and the voice coil Set in the magnetic gap.

11. The sounding device according to claim 7, wherein the first diaphragm comprises a first upper sound diaphragm connected to the upper frame, and a spacer is sleeved outside the first upper sound diaphragm and clamped therebetween. A second upper sound film is provided between the front cover and the middle frame, and a first dome connecting the first upper sound film and the second upper sound film, the first upper sound film and The second upper sound membrane includes a folded ring portion protruding toward the top wall.

12. The sound emitting device of claim 7, wherein:

The second diaphragm includes a lower sound diaphragm sandwiched between the back cover and the middle frame and a second dome connecting the lower frame and the lower sound diaphragm, and the lower sound diaphragm includes a The depressed folding ring part of the back cover.