CN215453260U

CN215453260U - Sound production device for electronic device and electronic device

Info

Publication number: CN215453260U
Application number: CN202122090727.1U
Authority: CN
Inventors: 李波波; 曹明君
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2022-01-07
Anticipated expiration: 2031-08-31

Abstract

The utility model discloses a sounding device for an electronic device and the electronic device, which comprise a shell, a vibration system and a magnetic circuit system, wherein the vibration system comprises a vibrating diaphragm and a voice coil for driving the vibrating diaphragm to vibrate along a first direction; the magnetic circuit system comprises a magnetic yoke, a central magnetic circuit structure and a side magnetic circuit structure, wherein the central magnetic circuit structure and the side magnetic circuit structure are arranged on the magnetic yoke; the central magnetic structure includes a central magnet, the side magnetic structure includes a side magnet, the side magnet is disposed on an outer peripheral side of the central magnet, the central magnet is magnetized in a first direction, the side magnet is magnetized in a circumferential direction, at least a part of a magnetic induction line in the side magnet extends toward a direction close to the magnetic gap, and the magnetic induction line in the central magnet form a closed magnetic induction line to pass through the voice coil in a direction perpendicular to the first direction. The utility model effectively reduces the distortion of the sounding device, particularly the low-frequency distortion, and improves the tone quality of the sounding device on the premise of not increasing the overall dimension of the sounding device.

Description

Sound production device for electronic device and electronic device

Technical Field

The present invention relates to the field of acoustic devices, and particularly to a sound generating device for an electronic device and an electronic device.

Background

Sound producing devices, such as micro-speakers, are widely used in electronic devices, such as modern portable devices, communication devices, and intelligent devices, due to their small size, and users increasingly demand high sound quality of speakers.

In the magnetic circuit design of the existing loudspeaker, the magnetic flux density of a region, which is just opposite to a central washer and a side washer, in a magnetic gap is the largest, but due to the limitation of a vibration space in the loudspeaker, the position of a voice coil in the magnetic gap cannot be freely adjusted, most of structures of the voice coil are positioned outside a magnetic induction line dense region, the driving force factor BL is not high, the sensitivity of the loudspeaker is influenced, and the tone quality of the loudspeaker is poor.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a sound production device for an electronic device and the electronic device, and aims to solve the problems of high distortion and poor sound quality of the sound production device in the prior art.

In order to achieve the above object, the present invention provides a sound generating device for an electronic device, including a housing, a vibration system and a magnetic circuit system, wherein the vibration system includes a diaphragm and a voice coil for driving the diaphragm to vibrate along a first direction; the magnetic circuit system comprises a magnetic yoke, a central magnetic circuit structure and a side magnetic circuit structure, wherein the central magnetic circuit structure and the side magnetic circuit structure are arranged on the magnetic yoke, a magnetic gap is formed between the central magnetic circuit structure and the side magnetic circuit structure, and the voice coil is arranged corresponding to the magnetic gap;

the center magnetic structure includes a center magnet, the side magnetic structure includes a side magnet provided on an outer peripheral side of the center magnet, the center magnet is magnetized in the first direction, the side magnet is magnetized in a circumferential direction, at least a part of a magnetic induction line in the side magnet extends toward a direction close to the magnetic gap, and forms a closed magnetic induction line with the magnetic induction line in the center magnet to pass through the voice coil in a direction perpendicular to the first direction.

Preferably, the magnetic induction line distribution plane formed by magnetizing the edge magnet in the circumferential direction is parallel to the first direction.

Preferably, the side magnetic structure includes a plurality of side magnets, each of the side magnets is in a bar structure and is magnetized along a circumferential direction, the plurality of side magnets are symmetrically arranged on an outer circumferential side of the central magnet in pairs, and the voice coil extends along the first direction and is suspended in the magnetic gap.

Preferably, the central magnet is of a rectangular structure, and the central magnet comprises two long sides arranged oppositely and two short sides arranged oppositely;

each long edge is correspondingly provided with one edge magnet; or,

and each long side and each short side are correspondingly provided with one side magnet.

Preferably, the edge magnet is of an integral annular structure, the edge magnet is arranged around the outer periphery of the central magnet, an annular magnetic gap is formed between the central magnet and the edge magnet, and the voice coil is of a flat structure and arranged above the magnetic gap.

Preferably, the central magnetic structure further comprises a central washer, and the central washer is arranged on one side of the central magnet, which faces away from the magnetic yoke.

Preferably, the side of the side magnet facing away from the magnetic yoke is flush with the side of the central washer facing away from the central magnet.

Preferably, the vibrating diaphragm includes central part, dog-ear portion and the fixed part that sets gradually from inside to outside, central part with the voice coil loudspeaker voice coil is connected, the fixed part with the casing is fixed.

Preferably, the central portion includes an inner ring portion formed by inward extension of an inner edge of the annular portion and a reinforcing portion formed by being combined with the inner ring portion, and the voice coil is connected to a position on the reinforcing portion combined with the inner ring portion.

Preferably, the vibration system further comprises a centering branch piece, one end of the centering branch piece is connected with the vibrating diaphragm, and the other end of the centering branch piece is connected with the shell.

The utility model also provides an electronic device which comprises a shell and the sounding device which is accommodated in the shell and is used for the electronic device.

Compared with the magnetic circuit design of the existing sounding device, the magnetizing direction of the side magnet is set to be the circumferential direction, so that the magnetic induction lines are distributed along the circumferential direction, the magnetic flux density and uniformity in a magnetic gap are improved, the whole voice coil can be positioned in a region with dense magnetic induction lines, the driving force factor BL is increased, the symmetry of a BL curve can be improved by adjusting the magnetizing circle center of the side magnet, the distortion of the sounding device, particularly the low-frequency distortion, is effectively reduced, and the tone quality of the sounding device is improved on the premise of not increasing the overall dimension of the sounding device. In addition, the sound production device of the utility model also omits a side washer structure in the traditional magnetic circuit design, reduces the BOM number of products and further reduces the production cost.

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 an exploded view of a sound device according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a sound device according to an embodiment of the present invention;

FIG. 3 is a BL curve simulation comparison graph of a circumferential magnetization mode and a parallel magnetization mode of a magnet in a sound production device;

FIG. 4 is a magnetic induction line distribution diagram of a sound producing device according to an embodiment of the present invention;

FIG. 5 is an exploded view of a sound device according to another embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view of a sound device according to another embodiment of the present invention, with parts omitted;

FIG. 7 is a magnetic induction line distribution diagram of a sound producing device according to another embodiment of the present invention;

FIG. 8 is an exploded view of a sound device according to another embodiment of the present invention;

FIG. 9 is a schematic cross-sectional view of a sound device according to yet another embodiment of the present invention, with a portion of the structure omitted;

FIG. 10 is a magnetic induction line distribution diagram of a sounding device according to yet another embodiment of the present invention.

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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

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

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is 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.

The utility model provides a sounding device 100.

The sound device 100 is used in an electronic device, and the sound device 100 may be a speaker. As shown in fig. 1-2, 5-6, and 8-9, in an embodiment, the sound generating device 100 includes a housing 10, a vibration system 20, and a magnetic circuit system 30, wherein the vibration system 20 includes a diaphragm 21 and a voice coil 22 for driving the diaphragm 21 to vibrate in a first direction; the magnetic circuit system 30 includes a magnetic yoke 31, a central magnetic circuit structure and a side magnetic circuit structure, which are disposed on the magnetic yoke 31, a magnetic gap 32 is formed between the central magnetic circuit structure and the side magnetic circuit structure, and the voice coil 22 is disposed corresponding to the magnetic gap 32; the central magnetic circuit structure includes a central magnet 33, the side magnetic circuit structure includes a side magnet 34, the side magnet 34 is disposed on the outer periphery side of the central magnet 33, the central magnet 33 is magnetized in a first direction, the side magnet 34 is magnetized in a circumferential direction, at least a part of the magnetic induction lines in the side magnet 34 extend toward a direction close to the magnetic gap 32, and are formed as closed magnetic induction lines with the magnetic induction lines in the central magnet 33 to pass through the voice coil 22 in a direction perpendicular to the first direction.

As shown in fig. 1-2, 5-6, and 8-9, the side magnetic structures surround the outer periphery of the central magnetic structure and form a magnetic gap 32, and the voice coil 22 is disposed corresponding to the magnetic gap 32, specifically, the voice coil 22 may be suspended in the magnetic gap 32 or suspended above the magnetic gap 32. The magnetic gap 32 between the side magnetic structure and the central magnetic structure generates a magnetic field, and the voice coil 22 performs reciprocating cutting magnetic induction line motion at the magnetic gap 32 to drive the diaphragm 21 to vibrate along the first direction, so that air is driven to sound, and energy conversion between electric sounds is completed. In an embodiment, the first direction is an up-down direction as shown in fig. 1-2, 5-6, and 8-9, and the up-down direction is a vertical direction.

In one embodiment, the central magnetic structure includes a central magnet 33, the side magnetic structure includes a side magnet 34, the central magnet 33 is magnetized in a first direction, i.e. the central magnet 33 is magnetized in a parallel manner in an up-down direction, and the side magnet 34 is magnetized in a circumferential direction, the magnetic induction lines in the side magnet 34 extend toward a direction close to the magnetic gap 32 and form a closed magnetic induction line with the magnetic induction lines in the central magnet 33 to pass through the voice coil 22 in a direction perpendicular to the first direction. As shown in fig. 2, 6, and 9, the center magnet 33 is magnetized in the vertical direction, the magnetic induction lines thereof are distributed in the vertical direction, the side magnets 34 are magnetized in the circumferential direction, the magnetic induction lines thereof are distributed in the circumferential direction, and the dotted arrows in fig. 2, 6, and 9 indicate the magnetizing direction.

As shown in fig. 4, 7 and 10, the magnetic induction lines of the side magnets 34 extend toward the direction close to the magnetic gap 32, and form closed magnetic induction lines with the magnetic induction lines in the center magnet 33, which can pass through the voice coil 22 in the direction perpendicular to the first direction, which is understandably a horizontal direction, which can pass through the voice coil 22 in the horizontal direction to cut the magnetic induction lines when the voice coil 22 reciprocates up and down. The yoke 31 has magnetic permeability, and can be made of SPCC or silicon steel, etc., and can correct the magnetic induction line directions of the central magnet 33 and the side magnets 34.

As shown in fig. 3, fig. 3 is a BL curve simulation comparison graph of the side magnet 34 of the sound production device 100 in the circumferential magnetization mode and the parallel magnetization mode. In fig. 3, the solid line represents the BL curve in the circumferential magnetization mode, the broken line represents the BL curve in the parallel magnetization mode, the abscissa represents the vibration displacement of the voice coil 22, and the ordinate represents the BL value. Compared with the parallel magnetization mode, the BL curve value of the circumferential magnetization mode is larger and more symmetrical. In fig. 4, 7, and 10, black lines indicate magnetic induction lines, and arrows indicate the charging direction.

Compared with the magnetic circuit design of the existing sound production device 100, the sound production device 100 of the present invention sets the magnetizing direction of the side magnet 34 to be the circumferential direction, so that the magnetic induction lines are distributed along the circumferential direction, as shown in fig. 4, 7 and 10, the magnetic flux density and uniformity in the magnetic gap 32 are improved, the voice coil 22 can be entirely located in the magnetic induction line dense region, the driving force factor BL is increased, and the symmetry of the BL curve can be improved by adjusting the magnetizing circle center of the side magnet 34, so that the distortion, especially the low frequency distortion of the sound production device 100 is effectively reduced, and the sound quality of the sound production device 100 is improved without increasing the overall size of the sound production device 100. In addition, because the edge magnet 34 is magnetized along the circumferential direction, and the magnetic induction line formed by the edge magnet 34 can extend towards the direction close to the magnetic gap, the sounder 100 of the utility model can also omit the edge washer structure in the traditional magnetic circuit design, so that the structure of the magnetic circuit system is simpler, the BOM number of products is reduced, and the production cost is further reduced.

Further, the distribution plane of the magnetic induction lines formed by magnetizing the edge magnet 34 in the circumferential direction is parallel to the first direction, as shown in fig. 4, 7 and 10, the distribution plane of the magnetic induction lines of the edge magnet 34 is vertically arranged and is parallel to the first direction, so that the effectiveness and reliability of cutting the magnetic induction lines when the voice coil 22 vibrates up and down in a reciprocating manner are improved, and the sound quality of the sound generating device 100 is further improved.

The side magnetic structure comprises a plurality of side magnets 34, each side magnet 34 is of a strip-shaped structure and is magnetized along the circumferential direction, the plurality of side magnets 34 are arranged on the outer peripheral side of the central magnet 33 in a pairwise symmetry manner, and the voice coil 22 extends along the first direction and is suspended in the magnetic gap 32.

As shown in fig. 1 and 2, in one embodiment, the number of the side magnets 34 is four, four side magnets 34 are arranged around the outer periphery of the central magnet 33, and each side magnet 34 has a bar-shaped structure, that is, each side magnet 34 is a bar-shaped side magnet 34. Each side magnet 34 forms a magnetic gap 32 with the central magnet 33, and the voice coil 22 extends vertically and is suspended in the magnetic gap 32 so that the voice coil 22 performs reciprocating cutting magnetic induction line motion in the magnetic gap 32. As shown in fig. 4, in this embodiment, each side magnet 34 is magnetized along the circumferential direction, which greatly increases the magnetic flux density and uniformity in the magnetic gap 32, and further improves the sound quality of the sound-producing device 100.

In this embodiment, central magnet 33 is a rectangular structure, and central magnet 33 includes two oppositely disposed long sides 331 and two oppositely disposed short sides 332; one edge magnet 34 is provided corresponding to each long edge 331 and each short edge 332. That is, the four side magnets 34 are arranged in one-to-one correspondence with the four sides of the center magnet 33, i.e., the two long sides 331 and the two short sides 332, so that the magnetic flux density and uniformity in the magnetic gap 32 are improved in all directions.

As shown in fig. 5 and 6, in another embodiment, the number of edge magnets 34 is two, the central magnet 33 has a rectangular structure, and the central magnet 33 includes two oppositely disposed long edges 331 and two oppositely disposed short edges 332; one side magnet 34 is provided corresponding to each long side 331, that is, two side magnets 34 are arranged in one-to-one correspondence with the two long sides 331 of the center magnet 33. Each side magnet 34 is a bar structure, i.e., each side magnet 34 is a bar side magnet 34. Each side magnet 34 forms a magnetic gap 32 with the central magnet 33, and the voice coil 22 extends vertically and is suspended in the magnetic gap 32 so that the voice coil 22 performs reciprocating cutting magnetic induction line motion in the magnetic gap 32. As shown in fig. 7, in this embodiment, each side magnet 34 is magnetized along the circumferential direction, so as to increase the magnetic flux density and uniformity in the magnetic gap 32, and further improve the sound quality of the sound generating device 100. In addition, the design of the two side magnets 34 can simplify the structure of the magnetic circuit system 30 in the sound generating device and reduce the BOM number of products.

In another embodiment, as shown in fig. 8 and 9, the edge magnet 34 is an integral ring structure, the edge magnet 34 is disposed around the outer periphery of the central magnet 33, the central magnet 33 and the edge magnet 34 form a ring-shaped magnetic gap 32 therebetween, and the voice coil 22 is a flat structure and disposed above the magnetic gap 32. As shown in fig. 8 and 9, the voice coil 22 has a flat structure, so that the vertical height of the voice coil 22 is not large, and the occupied volume is reduced. The magnetic gap 32 is disposed in a ring shape, and the voice coil 22 is disposed above the magnetic gap 32 and corresponding to the magnetic gap 32, so that the voice coil 22 can perform a reciprocating cutting magnetic induction line motion at the magnetic gap 32 during the process. As shown in fig. 10, in this embodiment, the magnet 34 and the magnet 34 are magnetized in the circumferential direction, so as to increase the magnetic flux density and uniformity in the magnetic gap 32, and further improve the sound quality of the sound-producing device 100.

In an embodiment, the central magnetic structure further includes a central washer 35, and the central washer 35 is disposed on a side of the central magnet 33 facing away from the yoke 31. As shown in fig. 1, 2, 5 and 6, the magnetic yoke 31 is located at a lower side of the central magnet 33, the central washer 35 is installed at an upper side of the central magnet 33, and the central washer 35 has magnetic permeability and can be made of SPCC or silicon steel. By providing the center washer 35 on the upper side of the center magnet 33, the magnetic induction line directions of the center magnet 33 and the side magnets 34 can be further corrected, the magnetic flux density and uniformity in the magnetic gap 32 can be increased, and the sound quality of the sound-producing device 100 can be improved.

In one embodiment, the side of edge magnet 34 facing away from yoke 31 is flush with the side of center washer 35 facing away from center magnet 33. As shown in fig. 2 and 6, the upper sides of the side magnets 34 are flush with the upper side of the central washer 35, and the height of the side magnets 34 is equal to the sum of the heights of the central magnet 33 and the central washer 35, so that the structure is compact, the height of the magnetic gap 32 is maximized, and the magnetic flux density and uniformity in the magnetic gap 32 are increased.

In one embodiment, the diaphragm 21 includes a central portion 211, a corrugated portion 212, and a fixing portion 213 sequentially disposed from inside to outside, the central portion 211 is connected to the voice coil 22, and the fixing portion 213 is fixed to the housing 10. As shown in fig. 1 and 2, the diaphragm 21 is connected to the upper side of the voice coil 22, specifically, the central portion 211 of the diaphragm 21 is connected to the voice coil 22, and the fixing portion 213 is fixed to the housing 10, so that the assembly of the voice coil 22, the diaphragm 21 and the housing 10 is realized.

Further, the central portion 211 includes an inner ring portion 2111 formed by extending inward from the inner edge of the annular portion 212 and a reinforcing portion 2112 combined with the inner ring portion 2111, and the voice coil 22 is connected to the reinforcing portion 2112 at a position combined with the inner ring portion 2111. Specifically, the inner ring portion 2111 is connected to the inner edge of the folded ring portion 212 in a ring shape, the reinforcing portion 2112 is in a rectangular structure, the blank of the inner ring portion 2111 is closed, the peripheral edge of the reinforcing portion 2112 is bonded to the inner ring portion 2111, a composite structure is formed, and the voice coil 22 is arranged at a position on the reinforcing portion 2112 where the voice coil is combined with the inner ring portion 2111, so that the synchronism of vibration of the inner ring portion 2111 and the reinforcing portion 2112 is improved, and the acoustic performance of the product is optimized.

As shown in fig. 1 and 2, in an embodiment, the vibration system 20 further includes a damper 23, one end of the damper 23 is connected to the diaphragm 21, and the other end of the damper 23 is connected to the housing 10. The arrangement of the centering disk 23 enables the centering disk 23 connected with the vibrating diaphragm 21 to synchronously vibrate when the voice coil 22 drives the vibrating diaphragm 21 to vibrate, the centering disk 23 plays a centering role, the anti-polarization performance of the vibration system 20 is effectively improved, and the acoustic performance of a product is further improved.

The utility model also provides an electronic device, which comprises a housing and the sound production device 100 for the electronic device, which is accommodated in the housing. In one embodiment, the electronic device may be a headset, a sound box, a wearable device, or the like. The specific structure of the sound generating device 100 in the electronic device refers to the above embodiments, and since the electronic device adopts all technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the technical solutions of the present invention, which are made by using 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 production device for an electronic device comprises a shell, a vibration system and a magnetic circuit system, wherein the vibration system comprises a vibrating diaphragm and a voice coil for driving the vibrating diaphragm to vibrate along a first direction; the magnetic circuit system comprises a magnetic yoke, a central magnetic circuit structure and a side magnetic circuit structure, wherein the central magnetic circuit structure and the side magnetic circuit structure are arranged on the magnetic yoke, a magnetic gap is formed between the central magnetic circuit structure and the side magnetic circuit structure, and the voice coil is arranged corresponding to the magnetic gap; it is characterized in that the preparation method is characterized in that,

2. The sound-producing device for an electronic device according to claim 1, wherein the edge magnet is magnetized in a circumferential direction to form a magnetic induction line distribution plane parallel to the first direction.

3. The sound production device for an electronic device according to claim 1, wherein the side magnetic structure comprises a plurality of side magnets, each of the side magnets has a bar-shaped structure and is magnetized in a circumferential direction, the plurality of side magnets are symmetrically arranged on an outer circumferential side of the central magnet in pairs, and the voice coil extends in the first direction and is suspended in the magnetic gap.

4. The sounder device according to claim 3, wherein said central magnet is of rectangular configuration, said central magnet comprising two oppositely disposed long sides and two oppositely disposed short sides;

each long edge is correspondingly provided with one edge magnet; or,

5. The sounder device according to claim 1, wherein said edge magnets are of a one-piece ring structure, said edge magnets are disposed around an outer periphery of said center magnet, and said center magnet and said edge magnets define a ring-shaped magnetic gap therebetween, and said voice coil is of a flat structure and disposed above said magnetic gap.

6. The sounder device according to claim 1, wherein said central magnetic structure further comprises a central washer disposed on a side of said central magnet facing away from said yoke.

7. The sounder device according to claim 6, wherein a side of said edge magnets facing away from said yoke is flush with a side of said central washer facing away from said central magnet.

8. The sound production device for an electronic device according to any one of claims 1 to 7, wherein the diaphragm comprises a central portion, a bending portion and a fixing portion, the central portion is connected to the voice coil, and the fixing portion is fixed to the housing.

9. The sound production device for an electronic device of any one of claims 1-7, wherein the vibration system further comprises a spider, one end of the spider being connected to the diaphragm and the other end of the spider being connected to the housing.

10. An electronic device, comprising a housing and a sound-producing device for an electronic device according to any one of claims 1 to 9 housed within the housing.