CN216122888U - Sound production device and electronic equipment - Google Patents

Abstract

The utility model discloses a sound generating device and electronic equipment, wherein the sound generating device comprises a shell and a loudspeaker single body, the shell is provided with a containing cavity with one open end, the loudspeaker single body is provided with a shell, the loudspeaker single body is arranged at the opening and partially exposed out of the opening, at least part of the outer wall of the shell is hermetically connected with the inner wall of the containing cavity, which is adjacent to the opening, so that the bottom of the loudspeaker single body and the inner wall of the containing cavity are enclosed to form a rear sound cavity. The utility model aims to provide the sound production device capable of effectively increasing the volume of the rear sound cavity, the sound production device is simple in structure and convenient to assemble, performance testing steps are effectively saved, and the acoustic performance of the sound production device is improved.

Description

Sound production device and electronic equipment

Technical Field

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

Background

The sound generating device is an important component in an electronic product and is used for converting an electric signal into an acoustic signal. The development trend of electronic products is more and more thin, and in order to realize more functions, components and parts in the electronic products are more and more, and the space that must reserve for sound generating mechanism is more and more littleer, and electronic products more and more pay attention to user's music experience, consequently requires sound generating mechanism to have better tone quality.

In the related technology, the sound generating device consists of an inner core, a metal upper shell and a metal lower shell, the inner core and the bottom surface of the metal upper shell are sealed by glue, the side wall is fixed by laser welding, and the volume of a rear sound cavity of the sound generating device is small, so that the acoustic performance of the sound generating device is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a sound generating device and electronic equipment, and aims to provide the sound generating device which can effectively increase the volume of a rear sound cavity.

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

the shell is provided with a cavity with one open end; and

the loudspeaker unit is provided with a shell, the loudspeaker unit is arranged at the opening and partially exposed out of the opening, at least part of the outer wall of the shell is in sealing connection with the inner wall, close to the opening, of the accommodating cavity, so that the bottom of the loudspeaker unit and the inner wall of the accommodating cavity are enclosed to form a rear sound cavity.

In one embodiment, the outer wall of one end of the outer shell extending into the cavity is welded with the inner wall of the cavity;

or the outer wall of one end of the shell extending into the cavity is connected with the inner wall of the cavity in an adhesive manner.

In one embodiment, a positioning table is convexly arranged on the inner wall of the shell, and the bottom of the loudspeaker unit is in limit abutting connection with the positioning table.

In one embodiment, the positioning table extends along the circumferential direction of the inner wall of the cavity;

or the positioning tables comprise a plurality of positioning tables which are arranged at intervals along the circumferential direction of the inner wall of the accommodating cavity.

In one embodiment, the positioning table is formed by bending the outer wall of the shell towards the inner recess of the accommodating cavity so that the inner wall of the shell is convex;

or the positioning table is connected with the shell in a welding mode.

In one embodiment, the speaker unit further includes:

the vibration system is connected to one end of the shell, which protrudes out of the opening; and

the magnetic circuit system is connected to one end, extending into the cavity, of the shell and is arranged opposite to the vibration system, the periphery of the magnetic circuit system is hermetically connected with the inner wall of the cavity, and one side, back to the vibration system, of the magnetic circuit system and the inner wall of the cavity are enclosed to form the rear sound cavity.

In one embodiment, the magnetic circuit system comprises a magnetic yoke, and a central magnetic circuit part and a side magnetic circuit part which are arranged on the magnetic yoke, wherein a magnetic gap is formed between the central magnetic circuit part and the side magnetic circuit part;

the central magnetic circuit part comprises a central magnet and a central magnetic conduction plate arranged on the central magnet, the magnetic circuit system is provided with a through hole penetrating through the magnetic conduction yoke and the central magnet, and the through hole is communicated with the rear sound cavity.

In one embodiment, the side magnetic circuit part comprises a side magnet and a side magnetic plate arranged on the side magnet, and the side magnetic plate and the shell are of an integrally molded structure;

and/or the periphery of the side magnetic circuit part is connected with the inner wall of the cavity in an adhesive manner;

and/or the periphery of the magnetic guide yoke is connected with the inner wall of the cavity in an adhesive manner;

and/or, the vibration system includes a vibrating diaphragm and a voice coil, the periphery of the vibrating diaphragm is provided with a fixed part and a bent part formed by bending and extending the fixed part downwards, the fixed part is connected with the end part of the end of the shell protruding out of the opening, the bent part is connected with the outer wall of the shell, one end of the voice coil is connected with the vibrating diaphragm, and the other end of the voice coil is suspended in the magnetic gap.

In an embodiment, the sound generating device further includes a conductive member, the conductive member includes a center piece and a flexible circuit board that are integrally connected, the center piece is sandwiched between the housing and the magnetic circuit system and is connected to the voice coil of the vibration system, the housing is provided with a via hole, and one end of the flexible circuit board, which is far away from the center piece, penetrates through the via hole and extends out of the accommodating cavity, and the via hole is sealed by a sealant;

and/or, the diapire that holds the chamber is seted up and is used for the filling hole of filling sound absorbing material, sound generating mechanism still includes damping piece, damping piece encapsulate in the filling hole.

The utility model also provides electronic equipment which comprises an equipment shell and the sound generating device, wherein the sound generating device is arranged on the equipment shell.

According to the sound generating device, the shell is arranged into the cavity structure with one open end, so that the speaker monomer is arranged at the opening of the cavity of the shell, part of the speaker monomer is exposed out of the opening, only part of the speaker monomer is located in the cavity, the volume of a rear sound cavity formed by the enclosure of the bottom of the speaker monomer and the inner wall of the cavity can be effectively increased, the outer wall of at least part of the shell is hermetically connected with the inner wall of the cavity, which is adjacent to the opening, the sealing effect of the rear sound cavity is effectively improved, meanwhile, part of the speaker monomer is exposed out of the opening of the shell, and when the sound generating device is arranged in the equipment shell, part of the speaker monomer exposed out of the opening of the shell and the equipment shell are enclosed to form a front sound cavity; meanwhile, the loudspeaker is installed in a single body only by utilizing one shell, so that the structure of the sound generating device is simplified, the assembly is more convenient, the performance testing step of the sound generating device is effectively saved, and the acoustic performance of the sound generating device is improved.

Drawings

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

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

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

fig. 3 is a schematic structural diagram of the case separated from the speaker unit according to an embodiment of the present invention;

FIG. 4 is a partially exploded view of a sound generator according to an embodiment of the present invention;

fig. 5 is a schematic cross-sectional view of a sound generating device according to an 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 all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

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

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

The sound generating device is an important component in an electronic product and is used for converting an electric signal into an acoustic signal. The development trend of electronic products is more and more thin, and in order to realize more functions, components and parts in the electronic products are more and more, and the space that must reserve for sound generating mechanism is more and more littleer, and electronic products more and more pay attention to user's music experience, consequently requires sound generating mechanism to have better tone quality.

Among the correlation technique, sound generating mechanism comprises kernel, metal epitheca and metal inferior valve, and the kernel is sealed with glue with the metal epitheca bottom surface, and the lateral wall selects laser welding to fix, and not only the process is complicated, and makes sound generating mechanism's back chamber shape irregular, and the air current that so gets into the back chamber is unstable inadequately, easily causes polarization, distortion scheduling problem, and acoustic effect is not ideal enough, if with sound generating mechanism volume diminish, will reduce sound generating mechanism back chamber volume certainly, influences sound generating mechanism's acoustic performance.

Based on the above conception and problems, the present invention provides a sound generating device 100, and it can be understood that the sound generating device 100 is applied to an electronic device, and the electronic device may be a mobile phone, a sound box, a computer, an earphone, a watch, a television, or the like, and is not limited herein.

Referring to fig. 1 to 5, in an embodiment of the present invention, the sound generating device 100 includes a casing 1 and a speaker unit 2, wherein the casing 1 has a cavity 11 with an opening 12 at one end, the speaker unit 2 has a housing 21, the speaker unit 2 is disposed at the opening 12 and partially exposed out of the opening 12, at least a portion of an outer wall of the housing 21 is hermetically connected to an inner wall of the cavity 11 adjacent to the opening 12, so that a bottom of the speaker unit 2 and the inner wall of the cavity 11 enclose to form a rear sound cavity 3.

In the present embodiment, the housing 1 of the sound generating apparatus 100 is used for mounting, fixing and protecting the speaker unit 2, that is, the housing 1 provides a mounting base for the speaker unit 2. It is understood that the housing 1 may be a unitary structure or a separate structure, for example, the housing 1 may be selected to be open at one end or open at both ends. Alternatively, the housing 1 is an open structure at one end, in which case the open structure at one end of the housing 1 may be an open structure at the upper end, and the other end is a closed structure, and the speaker unit 2 is assembled from the open end.

It can be understood that, the casing 1 has the diapire and locates the peripheral lateral wall of diapire, and the lateral wall encloses with the diapire and forms one end and has the appearance chamber 11 of opening 12, installs speaker monomer 2 from opening 12 when, only installs speaker monomer 2's part in holding the chamber 11 for part speaker monomer 2 exposes in opening 12, has so effectively increased the back sound chamber 3 volume that speaker monomer 2's bottom and the inner wall of holding the chamber 11 enclose and close the formation, thereby has promoted sound generating mechanism 100's acoustic performance.

In the present embodiment, as shown in fig. 3 to 5, the speaker unit 2 has a housing 21, and a vibration system 22 and a magnetic circuit system 23 provided in the housing 21, and the speaker unit 2 is hermetically connected to an inner wall of the cavity 11 adjacent to the opening 12 through at least part of an outer wall of the housing 21, so as to achieve mounting and fixing of the speaker unit 2. It can be understood that, the vibration system 22 introduces current into the magnetic field generated by the magnetic circuit system 23, and converts the electrical signal into mechanical energy under the action of the magnetic field, so that the vibration system 22 generates vibration, and the vibration system 22 generates vibration sound.

According to the sound generating device 100, the shell 1 is arranged to be the cavity 11 structure with the opening 12 at one end, so that the speaker monomer 2 is arranged at the opening 12 of the cavity 11 of the shell 1, part of the speaker monomer 2 is exposed out of the opening 12, only part of the speaker monomer 2 is located in the cavity 11, the volume of the rear sound cavity 3 formed by enclosing the bottom of the speaker monomer 2 and the inner wall of the cavity 11 can be effectively increased, at least part of the outer wall of the shell 21 is hermetically connected with the inner wall of the cavity 11, which is adjacent to the opening, so that the sealing effect of the rear sound cavity 3 is effectively improved, meanwhile, part of the speaker monomer 2 is exposed out of the opening 12 of the shell 1, and when the sound generating device 100 is installed in the equipment shell, part of the speaker monomer 2 exposed out of the opening 12 of the shell 1 and the equipment shell are enclosed to form the front sound cavity; meanwhile, the installation of the single loudspeaker body 2 is realized by only utilizing one shell 1 of the sound generating device 100, so that the structure of the sound generating device 100 is simplified, the assembly is more convenient, the performance testing steps of the sound generating device 100 are effectively saved, and the acoustic performance of the sound generating device is improved.

In an embodiment, an outer wall of one end of the outer shell 21 extending into the cavity 11 is welded to an inner wall of the cavity 11, that is, the outer shell 21 is connected to the side wall of the housing 1 by laser welding, so as to improve the installation stability of the speaker unit 2.

For convenience of positioning and welding, the side wall of the casing 1 is provided with a welding mark line corresponding to the outer shell 21, that is, the side wall of the casing 1 is provided with the welding mark line, so that after the speaker unit 2 is assembled in place, the outer shell 21 corresponds to the welding mark line, and the outer shell 21 and the side wall are connected by laser welding, which is not limited herein.

In another embodiment, the outer wall of one end of the outer shell 21 extending into the cavity 11 is connected with the inner wall of the cavity 11 by gluing, that is, the outer shell 21 is connected with the side wall of the housing 1 by gluing, so as to improve the installation stability of the speaker unit 2.

In one embodiment, a positioning table 13 is convexly arranged on the inner wall of the housing 1, and the bottom of the speaker unit 2 is in limit abutting contact with the positioning table 13.

In this embodiment, as shown in fig. 5, the positioning table 13 is disposed on the inner wall of the cavity 11, so that the positioning table 13 is utilized to position the assembly of the speaker unit 2, and the positioning table 13 also supports the speaker unit 2, thereby ensuring the volume of the rear sound cavity 3 after the speaker unit 2 is assembled, and preventing the speaker unit 2 from falling into the rear sound cavity 3 in the fading process of the sound generating apparatus 100.

In an embodiment, the positioning table 13 extends along the circumferential direction of the inner wall of the accommodating cavity 11, so that the bottom periphery of the speaker unit 2 is ensured to be in limit abutment with the positioning table 13, and the installation stability is further improved. It is understood that the positioning table 13 is provided as an annular boss, and is not limited thereto.

In another embodiment, the positioning table 13 includes a plurality of positioning tables 13, the plurality of positioning tables 13 are arranged at intervals along the circumferential direction of the inner wall of the chamber 11, when there is a gap between two adjacent positioning tables 13, the plurality of positioning tables 13 are arranged at intervals along the circumferential direction of the inner wall of the chamber 11 to form an annular structure. Furthermore, the positioning stages 13 may be provided on a pair of opposite side walls of the housing, respectively. The structural design form of the positioning table 13 is not particularly limited as long as the speaker unit 2 can be fixed in the cavity 11.

In an embodiment, the positioning table 13 is formed by bending an outer wall of the housing 1 towards the concave inside of the receiving cavity 11, and making an inner wall of the housing 1 convex. For example, the positioning table 13 may be a half-shear structure provided on the housing 1. It can be understood that, in this way, the positioning table 13 can be directly formed in the processing process of the housing 1 by bending or injection molding, and the structural strength of the positioning table 13 is improved. Moreover, the structural design can simplify the assembling process between the positioning table 13 and the shell 1, and improve the assembling efficiency.

Of course, the structural design of the positioning table 13 is not limited thereto. For example, the positioning table 13 may be a boss structure integrally formed on the inner wall of the housing 1 by injection molding; alternatively, the positioning table 13 is welded to the inner wall of the housing 1 by welding, which is not limited herein.

In an embodiment, the speaker unit 2 further includes a vibration system 22 and a magnetic circuit system 23, wherein the vibration system 22 is connected to one end of the housing 21 protruding out of the opening 12, the magnetic circuit system 23 is connected to one end of the housing 21 extending into the cavity 11 and is disposed opposite to the vibration system 22, a periphery of the magnetic circuit system 23 is hermetically connected to an inner wall of the cavity 11, and a side of the magnetic circuit system 23 facing away from the vibration system 22 and an inner wall of the cavity 11 are enclosed to form the rear acoustic cavity 3.

In the present embodiment, as shown in fig. 3 to 5, the housing 21 of the speaker unit 2 is used for mounting and fixing the vibration system 22 and the magnetic circuit system 23, that is, the housing 21 provides a mounting base for the vibration system 22 and the magnetic circuit system 23, the housing 21 may be a frame structure or a cylindrical structure, and the vibration system 22 and the magnetic circuit system 23 are oppositely disposed and are respectively connected to two opposite sides of the housing 21.

It can be understood that the sealing effect of the rear acoustic cavity 3 is effectively improved by gluing the periphery of the magnetic circuit system 23 to the inner wall of the cavity 11. In this embodiment, the periphery of the magnetic circuit system 23 may also be attached to the inner wall of the cavity 11, which is not limited herein.

In one embodiment, the magnetic circuit system 23 includes a magnetic yoke 231, and a central magnetic circuit portion 232 and a side magnetic circuit portion 233 provided on the magnetic yoke 231, wherein a magnetic gap 234 is formed between the central magnetic circuit portion 232 and the side magnetic circuit portion 233; the central magnetic circuit portion 232 includes a central magnet 2321 and a central magnetic conductive plate 2322 disposed on the central magnet 2321, the magnetic circuit system 23 is provided with a through hole 235 penetrating through the magnetic conductive yoke 231 and the central magnet 2321, and the through hole 235 is communicated with the rear acoustic cavity 3.

In the present embodiment, as shown in fig. 4 and 5, the central magnetic path portion 232 and the side magnetic path portion 233 constitute a magnetic path portion, and at least one of the central magnetic path portion 232 and the side magnetic path portion 233 is provided with a permanent magnet. Specifically, the central magnetic circuit portion 232 includes a central magnet 2321 and a central magnetic conductive plate 2322, and the side magnetic circuit portion 233 includes a side magnet 2331 and a side magnetic conductive plate 2332 disposed on the side magnet 2331.

It is understood that, in order to further simplify the manufacturing process, the edge conduction plate 2332 and the casing 21 are integrally formed, that is, the edge conduction plate 2332 of the edge magnetic circuit portion 233 and the casing 21 can be integrally formed, and the casing 21 can be made of a plastic material or a metal material. Optionally, the housing 21 is made of a metal material, so that the speaker unit 2 can dissipate heat quickly through the edge magnetic plate 2332 and the housing 21, and the heat dissipation effect is improved.

Alternatively, the periphery of the side magnetic circuit portion 233 is adhesively connected to the inner wall of the housing 11, that is, the side magnet 2331 of the side magnetic circuit portion 233 is adhesively connected to the inner wall of the housing 11. Of course, in other embodiments, the edge magnet 2331 of the edge magnetic circuit portion 233 is disposed to be attached to the inner wall of the housing chamber 11.

In this embodiment, the periphery of the magnetic yoke 231 is adhesively connected to the inner wall of the housing 11. Of course, the periphery of the magnetic yoke 231 is attached to the inner wall of the cavity 11. It can be understood that the side of the magnetic yoke 231 facing away from the magnetic circuit portion is in limit abutment with the positioning table 13. In order to further increase the volume of the rear acoustic cavity 3, the positioning groove is formed in the periphery of the magnetic conductive yoke 231 corresponding to the positioning table 13, so that when the magnetic conductive yoke 231 is in limit abutment with the positioning table 13, the positioning table 13 is accommodated and limited in the positioning groove, and the positioning table 13 is flush with the bottom of the magnetic conductive yoke 231, which is not limited herein.

In this embodiment, through setting up the through-hole 235 that runs through yoke 231 and center magnet 2321 for through-hole 235 and back vocal cavity 3 intercommunication, make through-hole 235 not only can play the effect of dilatation back vocal cavity 3, can also solve because miniaturized device vibration system 22 is little with the magnetic circuit interval, the acoustic resistance of vibration can grow and make the problem of vibration system 22 stability variation.

It should be noted that, the central region of the central magnet 2321 contributes less to the BL (a parameter for measuring the strength of the driving system in the speaker unit 2) of the speaker unit 2 than to the boundary region, so that, in the case that the volume of the rear acoustic cavity 3 is limited, the central region of the central magnet 2321 is hollowed out to increase the volume of the rear acoustic cavity 3, which is helpful to improve the performance of the product. Although the region in which the center magnet 2321 is hollowed out has little influence on the BL value of the magnetic circuit system 23, it has a somewhat influence. If the hollowed area of the center magnet 2321 is too large, its effect on the BL value of the magnetic circuit system 23 cannot be ignored. The larger the hollowed-out area is, the smaller the BL value of the magnetic circuit 23 is, and the lower the performance of the product is. Therefore, a balance range needs to be found, so that the amount of improvement of the product performance by the volume of the rear sound cavity 3 increased by hollowing out the central magnet 2321 is larger than the amount of reduction of the BL value of the magnetic circuit system 23 to reduce the product performance, thereby realizing optimization of the product performance.

Simulation shows that the product performance is improved when the volume of the hollow central magnet 2321 is within 35% of the original volume of the central magnet 2321. When the volume of the hollow of the center magnet 2321 exceeds this range, the BL value of the magnetic circuit system 23 sharply decreases. At this time, the performance improvement effect of the increase of the space of the rear acoustic cavity 3 is not as good as the performance reduction effect of the product caused by the reduction of the BL value of the magnetic circuit system 23, which is comprehensively expressed as the performance reduction of the product. Therefore, the open volume of the central magnet 2321 should satisfy: the ratio of the volume of the opening of the central magnet 2321 to the volume of the central magnet 2321 before opening is 35% or less, and may be further controlled within a range of 5% to 30%.

In one embodiment, the vibration system 22 includes a diaphragm 221 and a voice coil 222, the periphery of the diaphragm 221 is provided with a fixing portion 2211 and a bending portion 2212 formed by bending and extending the fixing portion 2211 downward, the fixing portion 2211 is connected to an end of the housing 21 protruding out of the opening 12, the bending portion 2212 is connected to an outer wall of the housing 21, one end of the voice coil 222 is connected to the diaphragm 221, and the other end of the voice coil 222 is suspended in the magnetic gap 234.

It can be understood that, by introducing current into the magnetic gap 234 of the magnetic circuit system 23 through the voice coil 222, under the action of the magnetic field formed by the magnetic circuit system 23, the voice coil 222 drives the diaphragm 221 to vibrate, thereby implementing sound production.

In this embodiment, by providing the fixing portion 2211 and the bending portion 2212 on the periphery of the diaphragm 221, the fixing portion 2211 is connected to the end of the case 21 protruding out of the opening 12, and the bending portion 2212 is connected to the outer wall of the case 21, so that the connection stability between the diaphragm 221 and the case 21 can be improved, and the effective vibration area of the diaphragm 221 can be increased.

In an embodiment, the sound generating apparatus 100 further includes a conductive device 4, the conductive device 4 includes a spider 41 and a flexible circuit board 42 integrally connected, the spider 41 is sandwiched between the casing 21 and the magnetic circuit system 23 and connected to the voice coil 222 of the vibration system 22, the housing 1 is provided with a via hole 15, and one end of the flexible circuit board 42 away from the spider 41 passes through the via hole 15 and extends out of the cavity 11, and the via hole 15 is sealed by a sealant.

In this embodiment, as shown in fig. 1 to 5, the centering disk 41 and the flexible circuit board 42 are integrated, so that the volume of the housing 1 of the sound generating device 100 is effectively reduced, that is, the housing 1 does not need to reserve an installation space for the portion of the flexible circuit board 42 extending into the cavity 11.

It can be understood that, the damper 41 includes an outer fixing portion and an elastic portion disposed inside the outer fixing portion, the outer fixing portion of the damper 41 is connected to one end of the flexible circuit board 42, the outer fixing portion of the damper 41 is sandwiched between the magnetic circuit system 23 and the housing 21, and the elastic portion of the damper 41 extends into the magnetic gap 234 and is connected to the voice coil 222, so that the voice coil 222 is connected to an external power source through the damper 41 and the flexible circuit board 42, and the damper 41 can be used to prevent the voice coil 222 from polarizing during vibration, thereby improving acoustic performance.

In this embodiment, the magnetic conductive yoke 231 is provided with a rear sound hole corresponding to the elastic portion of the damper plate 41, and the rear sound hole is communicated with the magnetic gap 234, that is, the elastic portion of the damper plate 41 is opposite to the rear sound hole of the magnetic conductive yoke 231, so that the vibration of the elastic portion of the damper plate 41 by the rear sound hole is avoided.

It is understood that the elastic portion of the spider 41 has an inner pad, so that the spider 41 is electrically connected to the voice coil 222 of the speaker unit 2 through the inner pad. The flexible circuit board 42 is further provided with an outer bonding pad, and the outer bonding pad is located at one end of the flexible circuit board 42 extending out of the cavity 11, so that the flexible circuit board 42 can be connected with an external power supply through the outer bonding pad.

In an embodiment, the bottom wall of the cavity 11 is opened with a filling hole 14 for filling the sound absorbing material, and the sound generating device 100 further includes a damping member 5, and the damping member 5 is sealed in the filling hole 14.

In this embodiment, as shown in fig. 2 and fig. 5, a bottom wall is disposed at an end of the housing 1 away from the opening 12, and at this time, the housing 1 is an integrally formed structure, that is, the side wall and the bottom wall enclose to form the receiving cavity 11. Optionally, the bottom wall is made of plastic material; alternatively, the bottom wall comprises an integrally moulded sheet metal.

In another embodiment, an end of the housing 1 away from the opening 12 is provided with an opening, and the housing 1 further comprises a lower cover plate installed in the opening. It can be understood that the lower cover plate can be made of a metal material, and the metal material can be made thinner, so that the occupied space is smaller. The lower cover plate can be flat; or the lower cover plate is for having the bowl dress structure of diapire and lateral wall, the lower cover plate is metal material and in the implementation mode that is bowl form structure, bowl form structure's metal lower cover plate has higher intensity, and occupation space is little, and the existence of lateral wall, partial back vocal cavity 3 has been formed, consequently casing 1 highly can reduce, avoid too high plastic housing to need do the wall thickness greatly and guarantee overall structure intensity, and then can increase occupation space's problem, more be favorable to realizing that the product is miniaturized.

In this embodiment, the lower cover plate is bonded on the end face of the casing 1 far away from the opening 12 through a glue layer, that is, the edge of the lower cover plate extends to the outer wall surface of the side wall of the casing 1, and the plate face of the lower cover plate opposite to the end face of the casing 1 far away from the opening 12 is provided with a back glue. The lower cover plate is bonded to the end face of the housing 1 remote from the opening 12 by its own adhesive to seal the rear acoustic chamber 3. Of course, in other embodiments, the periphery of the lower cover plate is injection moulded with a plastic rim which is ultrasonically welded to the end of the housing 1 remote from the opening 12.

As can be appreciated, the filling hole 14 is opened on the bottom wall or the lower cover plate, so that the sound-absorbing material is filled into the rear sound cavity 3 through the filling hole 14. By providing the damping member 5, the filling hole 14 is blocked by the damping member 5, and leakage of sound absorbing particles is prevented. Optionally, the damping member 5 is made of PET.

In this embodiment, the damping member 5 may be provided with air-permeable pores that allow air to pass therethrough but do not allow the sound-absorbing material to pass therethrough; alternatively, the damping member 5 is further provided with a leakage hole, and the leakage hole is covered with a damping net which allows air to pass through but does not allow the sound-absorbing material to pass through. So that the filling hole 14 can also be used as a rear cavity leakage hole to balance the air pressure inside and outside the sound generating device 100. Furthermore, the size of the acoustic resistance can be adjusted by adjusting the size of the air-permeable micropores or adjusting the mesh size of the damping net.

In an embodiment, the bottom wall or the lower cover plate is provided with a damping hole communicated with the rear sound cavity 3, and the sound generating device 100 further includes a damping member covering the damping hole. As can be understood, the air leakage or ventilation effect on the filling cavity is realized by the damping holes through arranging the damping pieces at the damping holes.

The sound generating device 100 only needs one shell, namely only needs one lower shell structure, the magnetic circuit system 23 of the speaker monomer 2 is firstly arranged in the accommodating cavity 11 from the opening 12 of the cavity 11, the bottom of the magnetic conduction yoke 231 of the magnetic circuit system 23 is positioned and abutted against the positioning table 13, then the shell 21 provided with the vibration system 22 is assembled with the magnetic circuit system 23 arranged in the accommodating cavity 11, and the assembly of the sound generating device 100 is completed.

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

In this embodiment, a cavity is disposed in the device housing, and the sound generating device 100 is disposed in the cavity, wherein the sound generating device 100 cooperates with an inner peripheral wall of the cavity to form a front sound cavity. It is understood that the electronic device may be a mobile phone, a sound box, a computer, a headset, a watch, a television, a tablet computer, or the like, and is not limited herein.

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

Claims (10)

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

the shell is provided with a cavity with one open end; and

the loudspeaker unit is provided with a shell, the loudspeaker unit is arranged at the opening and partially exposed out of the opening, at least part of the outer wall of the shell is in sealing connection with the inner wall, close to the opening, of the accommodating cavity, so that the bottom of the loudspeaker unit and the inner wall of the accommodating cavity are enclosed to form a rear sound cavity.

2. The sound generating device as claimed in claim 1, wherein the outer wall of the end of the housing extending into the cavity is welded to the inner wall of the cavity;

or the outer wall of one end of the shell extending into the cavity is connected with the inner wall of the cavity in an adhesive manner.

3. The sounding device as described in claim 1, wherein a positioning table is protruded from an inner wall of said housing, and a bottom of said speaker unit is in limit abutment with said positioning table.

4. The apparatus according to claim 3, wherein said positioning table extends along a circumferential direction of an inner wall of said cavity;

or the positioning tables comprise a plurality of positioning tables which are arranged at intervals along the circumferential direction of the inner wall of the accommodating cavity.

5. The sounding device according to claim 3, wherein the positioning table is formed by bending an outer wall of the housing towards the concave cavity so that an inner wall of the housing is convex;

or the positioning table is connected with the shell in a welding mode.

6. The sound generating apparatus according to any one of claims 1 to 5, wherein the speaker unit further comprises:

the vibration system is connected to one end of the shell, which protrudes out of the opening; and

the magnetic circuit system is connected to one end, extending into the cavity, of the shell and is arranged opposite to the vibration system, the periphery of the magnetic circuit system is hermetically connected with the inner wall of the cavity, and one side, back to the vibration system, of the magnetic circuit system and the inner wall of the cavity are enclosed to form the rear sound cavity.

7. The sound generating apparatus as claimed in claim 6, wherein the magnetic circuit system comprises a yoke and a central magnetic circuit portion and a side magnetic circuit portion provided to the yoke, a magnetic gap being formed between the central magnetic circuit portion and the side magnetic circuit portion;

the central magnetic circuit part comprises a central magnet and a central magnetic conduction plate arranged on the central magnet, the magnetic circuit system is provided with a through hole penetrating through the magnetic conduction yoke and the central magnet, and the through hole is communicated with the rear sound cavity.

8. The apparatus according to claim 7, wherein said side magnetic circuit portion comprises a side magnet and a side magnetic plate disposed on said side magnet, said side magnetic plate and said casing being of an integrally formed structure;

and/or the periphery of the side magnetic circuit part is connected with the inner wall of the cavity in an adhesive manner;

and/or the periphery of the magnetic guide yoke is connected with the inner wall of the cavity in an adhesive manner;

and/or, the vibration system includes a vibrating diaphragm and a voice coil, the periphery of the vibrating diaphragm is provided with a fixed part and a bent part formed by bending and extending the fixed part downwards, the fixed part is connected with the end part of the end of the shell protruding out of the opening, the bent part is connected with the outer wall of the shell, one end of the voice coil is connected with the vibrating diaphragm, and the other end of the voice coil is suspended in the magnetic gap.

9. The sound generating device according to claim 6, wherein the sound generating device further comprises a conductive member, the conductive member comprises a centering disk and a flexible circuit board which are integrally connected, the centering disk is sandwiched between the housing and the magnetic circuit system and is connected with the voice coil of the vibration system, the housing is provided with a via hole, one end of the flexible circuit board, which is far away from the centering disk, penetrates through the via hole to extend out of the cavity, and the via hole is sealed by a sealant;

and/or, the diapire that holds the chamber is seted up and is used for the filling hole of filling sound absorbing material, sound generating mechanism still includes damping piece, damping piece encapsulate in the filling hole.

10. An electronic device comprising a device housing and a sound generating device according to any one of claims 1 to 9, the sound generating device being provided in the device housing.

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