WO2022041453A1

WO2022041453A1 - Loudspeaker box

Info

Publication number: WO2022041453A1
Application number: PCT/CN2020/124115
Authority: WO
Inventors: 吴军; 印兆宇
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声光电科技(常州)有限公司
Priority date: 2020-08-27
Filing date: 2020-10-27
Publication date: 2022-03-03
Also published as: CN112153500B; CN112153500A

Abstract

Provided is a loudspeaker box, which comprises a housing having an accommodating space, and a sound production unit that is fixedly accommodated in the accommodating space. The sound production unit and the housing define a closed rear sound cavity; the sound production unit comprises a diaphragm for vibrating to produce a sound; and the housing is made of a metal material. The loudspeaker box further comprises an auxiliary cavity shell that abuts against and is fixed to an outer side of the housing, wherein the auxiliary cavity shell and the housing jointly define an auxiliary sound cavity; and the housing is provided with a leakage port that penetrates same, and the leakage port communicates the rear sound cavity with the auxiliary sound cavity. Compared with the prior art, the loudspeaker box in the present invention is easily assembled, and has high assembly reliability and good sealing performance.

Description

speaker box

technical field

The invention relates to the field of electro-acoustic conversion, in particular to a speaker box used in portable mobile electronic products.

Background technique

Speaker boxes are widely used in portable mobile electronic products, such as mobile phones, to realize the conversion of audio signals into sound playback. The speaker box has high loudness and good low-frequency sound effect.

The speaker box of the related art includes a front cover, a rear cover that is covered on the front cover and jointly encloses a receiving space, and a sound-emitting unit received in the receiving space, and the sound-emitting unit divides the receiving space into Anterior and posterior chambers.

technical problem

However, in the related art, the front cover and the rear cover of the speaker box are injection-molded, and the sound-emitting unit is sealed by ultrasonic welding. Ultrasonic welding requires more volume, which limits the volume design of the front cavity and the rear cavity. , which in turn limits the acoustic performance.

Therefore, it is necessary to provide a new speaker box to solve the above technical problems.

technical solutions

The purpose of the present invention is to provide a speaker box with good low-frequency acoustic performance.

In order to achieve the above object, the present invention provides a speaker box, which includes a casing with a receiving space and a sound-emitting unit fixedly accommodated in the receiving space, the sound-producing unit and the casing enclose a closed rear a sound cavity, the sound-generating unit includes a diaphragm for vibrating and sounding; the shell is made of metal material, and the speaker box further includes an auxiliary cavity shell abutting and fixed on the outside of the shell, the auxiliary cavity The shell and the casing together form an auxiliary acoustic cavity, and the casing is provided with a leakage opening therethrough, and the leakage opening communicates the rear acoustic cavity with the auxiliary acoustic cavity.

Preferably, the auxiliary sound cavity is filled with sound absorbing material.

Preferably, the housing includes a front cover and a rear cover that is covered and fixed on the front cover, the front cover includes a front cover body and is bent and extended toward the rear cover from the outer periphery of the front cover body The side wall of the front cover; the back cover includes a back cover body that is spaced apart from the front cover body, and is bent and extended toward the front cover from the peripheral edge of the back cover body and is connected to the side wall of the front cover. abutting and fixing the side wall of the rear cover, the auxiliary chamber shell is abutting and fixing on the side wall of the front cover and the side wall of the rear cover at the same time, the side wall of the front cover, the side wall of the rear cover and the auxiliary The cavity shells together form the auxiliary acoustic cavity, and the leakage port is disposed through the side wall of the front cover and/or the side wall of the rear cover along the vibration direction perpendicular to the diaphragm.

Preferably, the speaker box further includes a ring-shaped bracket made of plastic and located in the receiving space, the bracket is fixedly connected with the front cover body, and the sound generating unit is provided with the vibration One side of the membrane is sealed and fixed with the bracket and is spaced from the front cover body, and the sound generating unit, the bracket and the front cover body together form a front sound cavity; the front cover side wall is provided with The sound outlet passing through it, the bracket is provided with a sound guiding channel passing through it, the sound guiding channel communicates the front sound cavity with the sound outlet, the sound producing unit, the bracket, the The front cover and the rear cover together enclose the airtight rear acoustic cavity.

Preferably, the bracket comprises a ring-shaped bracket body fixed on the front cover body and a positioning step formed on the inner periphery of the bracket body, the sound-emitting unit is supported on the positioning step, and the bracket The body is arranged around the periphery of the sound-generating unit and is sealed and fixed with the sound-generating unit.

Preferably, the speaker box further includes a ventilating spacer located in the rear acoustic cavity, and the ventilating spacer is fixed to the bracket body and separates the sound-generating unit from the rear acoustic cavity.

Preferably, the ventilating spacer includes an spacer body that is spaced apart from the back cover body and is attached to the sound-generating unit, and an spacer that is bent and extended from the periphery of the spacer body toward the bracket. an extension part and a spacer fixing part bent and extended from one end of the spacer extension part away from the spacer body; the spacer extension part and the casing are arranged at intervals, and the spacer fixing part is fixed to the spacer The bracket body is close to one side of the rear cover body; the air-permeable spacer, the bracket, the front cover and the rear cover together form a powder filling space, and the powder filling space is filled with sound-absorbing material.

Preferably, the speaker box further includes a conductive member that connects the sound-emitting unit with an external electrical signal, the conductive member includes a conductive member body supported and fixed on one end of the bracket body close to the back cover, and the conductive member is The two ends of the conductive part body extend toward the sound-generating unit and are fixed and electrically connected to the connecting arm; an extension arm; the spacer fixing part is press-fitted and fixed on the side of the conductor body away from the bracket body.

Preferably, the auxiliary cavity shell includes an auxiliary front cover and an auxiliary rear cover that are mutually covered and fixed along the vibration direction of the diaphragm, and the auxiliary front cover includes an auxiliary front cover fixed to the casing, The auxiliary front cover side wall is bent and extended from the peripheral edge of the auxiliary front cover plate, and a through hole penetrates through the auxiliary front cover side wall. The casing connects the through port with the leakage port, and the auxiliary rear cover is fixed on the side wall of the auxiliary front cover and is fixedly connected with the casing.

Preferably, both the auxiliary front cover and the auxiliary rear cover are made of metal materials, and the auxiliary rear cover is welded and fixed to the auxiliary front cover to form the auxiliary cavity shell.

beneficial effect

Compared with the related art, in the speaker box of the present invention, the shell is made of metal material; the speaker box further includes an auxiliary cavity shell abutting and fixed on the outer side of the shell, the auxiliary cavity shell and the shell together enclose an auxiliary sound cavity, and the shell The body is provided with a leakage port running through it, and the leakage port communicates the rear acoustic cavity with the auxiliary acoustic cavity; in the above structure, the front cover and the rear cover are made of metal materials, and the front cover and the rear cover can be made of thinner steel sheets , the shell can be designed to be thinner, which greatly increases the volume of the cavity in the shell, effectively increases the volume of the rear sound cavity enclosed by the sound-generating unit and the shell, thereby improving the acoustic performance of the speaker box, especially is the low-frequency acoustic performance; in addition, an auxiliary acoustic cavity is added through the setting of the auxiliary acoustic shell, which effectively expands the cavity volume of the rear acoustic cavity, thereby effectively improving the low-frequency acoustic performance.

Description of drawings

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

Fig. 1 is the three-dimensional structure schematic diagram of the speaker box of the present invention;

Fig. 2 is the partial three-dimensional structure exploded schematic diagram of the speaker box of the present invention;

FIG. 3 is a schematic exploded schematic diagram of a partial three-dimensional structure of the speaker box of the present invention from another angle;

Fig. 4 is a sectional view along line A-A in Fig. 1;

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

Embodiments of the present invention

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

Please refer to FIGS. 1-5 at the same time, the present invention provides a speaker box 100 , which includes a housing 1 having a receiving space 10 and a sounding unit 2 fixedly received in the receiving space 10 , and located in the receiving space 10 . The inner bracket 3 and the auxiliary cavity shell 4 abutted and fixed on the outer side of the casing 1 , the sound generating unit 2 and the casing 1 together form a rear acoustic cavity 102 .

The casing 1 is made of a metal material, and the casing 1 is a split structure, which includes a front cover 11 made of a metal material and a rear cover made of a metal material that is covered and fixed on the front cover 11 12. The front cover 11 and the rear cover 12 together form the receiving space 10 , and the front cover 11 is provided with a sound outlet 13 extending therethrough and communicating with the outside world.

The bracket 3 is made of plastic and has an annular structure, and the bracket 3 forms a fixed connection with the front cover 11 .

The sound-generating unit 2 includes a vibrating membrane 21 for vibrating and sounding. The sound-generating unit 2 is fixedly supported on the bracket 3 and is sealed and fixed with the bracket 3, so that the sound-generating unit 2, the The bracket 3, the front cover 11 and the rear cover 12 together form the airtight rear acoustic cavity 102; of course, in other embodiments, it is also feasible not to provide a bracket, in this case, the sounding unit is directly fixed and supported on the The shell and the shell together form a rear acoustic cavity.

The auxiliary cavity shell 4 and the casing 1 together form an auxiliary acoustic cavity 103, the casing 1 is provided with a leakage port 104 therethrough, and the leakage port 104 connects the rear acoustic cavity 102 and the auxiliary acoustic cavity. 103 Connected.

Further, the auxiliary cavity shell 4 includes an auxiliary front cover 41 and an auxiliary rear cover 42 which are mutually covered and fixed along the vibration direction of the diaphragm 21 . The front cover plate 411 , the auxiliary front cover side wall 412 bent and extended from the peripheral edge of the auxiliary front cover plate 411 , and the through opening 413 passing through the auxiliary front cover side wall 412 . One side of the through port 413 is abutted and fixed to the casing 1 so that the through port 413 communicates with the leakage port 104 , and the auxiliary rear cover 42 is covered and fixed to the side wall 412 of the auxiliary front cover. It is fixedly connected with the housing 1 .

It is worth mentioning that the material of the auxiliary cavity shell 4 is not limited, and it can be a plastic shell or a metal shell. In this embodiment, in order to facilitate the assembly of the auxiliary cavity shell 4, preferably, The auxiliary front cover 41 and the auxiliary rear cover 42 are both made of metal materials, and the auxiliary rear cover 42 is welded and fixed to the auxiliary front cover 41 to form the auxiliary cavity shell 4 made of metal materials; Preferably, since the casing 1 is also made of a metal material, the casing 1 and the auxiliary cavity shell 4 can be fixed by means of metal welding, which makes the assembly between the two more convenient.

In the above structure, in the combined structure of the front cover 11, the rear cover 12 and the bracket 3, the front cover 11 and the rear cover 12 are made of metal materials, and they can be made of thinner steel sheets. The front cover 11 and the rear cover 12 are fixed by metal welding. This structure is provided on the premise of ensuring the structural strength of the casing 1. Compared with the all-plastic casing structure of the related art, the The shell 1 can be designed to be thinner, and the bracket 3 made of plastic material is fixed to the front cover 11 to support and fix the sound-emitting unit 2, and can effectively assemble the sound-emitting unit 2, thereby greatly improving the performance. The volume of the cavity in the housing 1 effectively increases the volume of the rear acoustic cavity 102 enclosed by the sounding unit 2 and the housing 1, thereby improving the acoustic performance of the speaker box, especially the low-frequency acoustic performance; Here, it should be noted that, in order to make the shell 1 made of metal material can effectively absorb vibration during use, the dimensions of the front cover 11 and the rear cover 12 are limited, and therefore limited The cavity volume of the rear acoustic cavity 102, and in this embodiment, by arranging the auxiliary acoustic shell 4 on the outer side of the housing 1, the auxiliary acoustic cavity 103 effectively expands the cavity volume of the rear acoustic cavity 102, thereby effectively to improve low-frequency acoustic performance. In addition, the additional auxiliary acoustic shell 4 can be customized according to the environment of the whole machine, so as to maximize the cavity utilization of the whole machine.

Specifically, the front cover 11 includes a front cover body 111 provided with the sound outlet 13, and a front cover side wall 112 that is bent and extended from the outer periphery of the front cover body 111 toward the rear cover 12; The sound outlet 13 is disposed through the side wall 112 of the front cover along the vibration direction perpendicular to the diaphragm 21 .

The rear cover 12 includes a rear cover body 121 disposed opposite to the front cover body 111 and a rear cover body 121 . Abutting against the fixed rear cover side wall 122 . In this embodiment, the front cover 11 is fixed by welding the front cover side wall 112 and the rear cover side wall 122 of the rear cover. The front cover 11 and the rear cover 12 are relatively plastic in the prior art The structure can be designed thinner, and the fixing strength is more reliable.

The auxiliary cavity shell 4 is abutted and fixed to the front cover side wall 112 and the rear cover side wall 122 at the same time, and the front cover side wall 112 , the rear cover side wall 122 and the auxiliary cavity shell 4 share The auxiliary acoustic cavity 103 is enclosed, and the leakage port 104 is disposed through the front cover side wall 112 and the rear cover side wall 122 along the vibration direction perpendicular to the diaphragm 21; of course, in other embodiments, only It is also feasible to provide leakage openings on the side walls of the front cover or only on the side walls of the rear cover.

The bracket 3 is fixedly connected with the front cover body 111 , and the side of the sound generating unit 2 with the diaphragm 21 is fixedly sealed to the bracket 3 and is spaced from the front cover body 11 , so The sound-producing unit 2, the bracket 3 and the front cover body 111 together form a front acoustic cavity 101. The bracket 3 is provided with a sound guide channel 30 passing through it, and the sound guide channel 30 connects the front sound cavity. 101 communicates with the sound outlet 13 to form a side sounding structure of the speaker box 100 .

Specifically, the bracket 3 includes an annular bracket body 31 sealed and fixed to the front cover 11 , a positioning step 32 formed on the inner periphery of the bracket body 31 , and a guide formed by extending from the bracket body 31 . Part 33.

The bracket body 31 is fixed on the front cover body 111 , the positioning step 32 is formed by the inner periphery of the bracket body 31 being recessed along the vibration direction, and the sounding unit 2 is supported on the positioning step 32 away from On one side of the front cover main body 111 , the sound guiding portion 33 is formed by protruding and extending from the outside of the bracket body 31 along the vibration direction, and the sound guiding portion 33 abuts against the front cover side wall 112 , the sound guide channel 30 is arranged through the sound guide part 33 . In this embodiment, the bracket 3 is injection-molded on the front cover 1 .

The bracket body 31 is partially disposed around the periphery of the sound-generating unit 2 and is sealed and fixed with the sound-generating unit 2 , so that the rear acoustic cavity 102 forms a closed space for improving low-frequency acoustic performance.

In order to further improve the low-frequency acoustic performance of the speaker device 100, the speaker box 100 further includes a ventilating spacer 5 located in the rear acoustic cavity 102, and the ventilating spacer 5 is fixed to the bracket body 31 and connects the sound-emitting unit 5. The body 2 is separated from the rear acoustic cavity 102 , so that a powder filling space 7 that can be filled with sound-absorbing material is formed in the rear acoustic cavity 102 .

Specifically, the ventilating spacer 5 includes a spacer body 51 that is spaced apart from the rear cover body 121 and is attached to the sound-generating unit 1 , and is directed from the periphery of the spacer body 51 to the bracket 3 The spacer extension portion 52 that is bent and extended and the spacer fixing portion 53 that is bent and extended from the end of the spacer extension portion 52 away from the spacer body 51 can be bent and extended toward the direction close to the side wall 112 of the front cover , it can also be bent and extended in a direction away from the side wall 112 of the front cover. The spacer extending portion 52 is spaced apart from the housing 1 , and the spacer fixing portion 52 is fixed to a side of the bracket body 31 close to the rear cover body 121 . The air-permeable spacer 5, the bracket 3, the front cover 11 and the rear cover 12 together form a powder filling space 7, and the powder filling space 7 is used for filling sound-absorbing materials, such as sound-absorbing particles, sound-absorbing cotton, etc. .

More preferably, the auxiliary acoustic cavity 103 is also filled with sound-absorbing material, which further optimizes the low-frequency acoustic performance.

The speaker box 100 further includes a conductive member 6 that connects the sound generating unit 2 with external electrical signals. In this embodiment, the conductive member 6 includes a conductive member body 61 supported and fixed on one end of the bracket body 31 close to the rear cover 12 . A connecting arm 62 that extends and is fixed and electrically connected to the sounding unit 2 and an extension arm 63 that extends away from the sounding unit 2 from the conductor body 61 and penetrates through the housing 1 . In this embodiment, the extension arm 63 penetrates both the front cover side wall 112 and the rear cover side wall 122 . This structure is convenient for assembly. It penetrates the position of the front cover side wall 112 and the position of the rear cover side wall 122 . It can be used as assembly positioning in advance to improve assembly efficiency.

In order to form an effective seal when the air-permeable spacer 5 is fixed to the bracket 3 and ensure that the sound-absorbing material in the powder filling space 7 will not enter the sound-generating unit 2 and affect its performance, in this embodiment, the spacer fixing portion 53 It is pressed and fixed on the side of the conductor body 61 away from the bracket body 31 .

Compared with the related art, in the speaker box of the present invention, the casing includes a front cover made of metal material and a back cover made of metal material which is covered and fixed on the front cover, and the front cover and the rear cover together enclose a housing. In the space, the sounding unit, the front cover and the rear cover together form a closed rear sound cavity; the speaker box also includes an auxiliary cavity shell covered on the outer side of the shell, the auxiliary cavity shell and the shell together form an auxiliary sound cavity, and the shell is provided with an auxiliary cavity shell. The leakage port on it runs through, and the leakage port communicates the rear acoustic cavity with the auxiliary acoustic cavity; in the above structure, the front cover and the rear cover are made of metal materials, and the front cover and the rear cover can be made of thinner steel sheets, and the shell It can be designed to be thinner, which greatly increases the volume of the cavity in the shell, effectively increases the volume of the rear sound cavity enclosed by the sounding unit and the shell, and improves the acoustic performance of the speaker box, especially the low-frequency acoustics. In addition, through the arrangement of the auxiliary acoustic shell, an auxiliary acoustic cavity is added, and the auxiliary acoustic cavity effectively expands the cavity volume of the rear acoustic cavity, thereby effectively improving the low-frequency acoustic performance.

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

Claims

A loudspeaker box comprises a casing with a receiving space and a sound-producing unit fixedly accommodated in the receiving space, the sound-producing unit and the casing enclose a closed rear sound cavity, and the sound-producing unit includes A diaphragm for vibrating and sounding, characterized in that the casing is made of a metal material, and the speaker box further includes an auxiliary cavity shell abutting and fixed on the outside of the shell, the auxiliary cavity shell and the The casings together form an auxiliary acoustic cavity, and the casing is provided with a leakage opening therethrough, and the leakage opening communicates the rear acoustic cavity with the auxiliary acoustic cavity.
The speaker box according to claim 1, wherein the auxiliary sound cavity is filled with sound absorbing material.
The loudspeaker box according to claim 1, wherein the housing comprises a front cover and a rear cover fixed on the front cover, the front cover comprises a front cover body and a back cover formed by the front cover body a side wall of the front cover whose outer peripheral edge is bent and extended in the direction of the rear cover; the rear cover includes a rear cover body arranged at a distance from the front cover body and a direction from the peripheral edge of the rear cover body to the front cover The back cover side wall is bent and extended and fixed in abutment with the front cover side wall. The auxiliary chamber shell is abutted and fixed on the front cover side wall and the rear cover side wall at the same time. , The side wall of the rear cover and the auxiliary cavity shell together form the auxiliary sound cavity, and the leakage port penetrates the side wall of the front cover and/or the side wall of the rear cover along the vibration direction perpendicular to the diaphragm set up.
The speaker box according to claim 3, wherein the speaker box further comprises a ring-shaped bracket made of plastic and located in the receiving space, the bracket is fixedly connected with the front cover body , the side of the sound-producing unit with the diaphragm is sealed and fixed with the bracket and is spaced from the front cover body, and the sound-producing unit, the bracket and the front cover body are jointly surrounded by a front sound cavity; the side wall of the front cover is provided with a sound outlet passing through it, the bracket is provided with a sound guiding channel passing through it, and the sound guiding channel communicates the front sound cavity with the sound outlet, The sounding unit, the bracket, the front cover and the rear cover together form the airtight rear sound cavity.
The speaker box according to claim 4, wherein the bracket comprises a ring-shaped bracket body fixed on the front cover body and a positioning step formed on the inner periphery of the bracket body, and the sounding unit The body is supported on the positioning step, and the bracket body is arranged around the periphery of the sound-generating unit and is sealed and fixed with the sound-generating unit.
The speaker box according to claim 5, wherein the speaker box further comprises a ventilating spacer located in the rear acoustic cavity, the ventilating spacer is fixed to the bracket body and separates the sound-generating unit from the sound-generating unit. The rear acoustic cavity is separated.
The speaker box according to claim 6, wherein the ventilating spacer comprises a spacer body opposite to the back cover body and attached to the sound-generating unit, and a periphery of the spacer body a spacer extension part bent and extended toward the bracket and a spacer fixing part bent and extended from one end of the spacer extension part away from the spacer body; the spacer extension part is spaced from the housing The spacer fixing part is fixed on the side of the bracket body close to the rear cover body; the ventilation spacer, the bracket, the front cover and the rear cover together form a powder filling space, The powder filling space is filled with sound-absorbing material.
The speaker box according to claim 7, characterized in that, the speaker box further comprises a conductive member for connecting the sound-generating unit with an external electrical signal, the conductive member comprising a support and fixed to the bracket body close to the A conductive member body at one end of the back cover, a connecting arm extending from the two ends of the conductive member body towards the sounding unit and being fixed and electrically connected to the sounding unit, and a connecting arm extending from the conductive member body to the sounding unit away from the sounding unit The single body extends in a direction and penetrates the extension arm of the casing; the spacer fixing portion is press-fitted and fixed on the side of the conductive member body away from the bracket body.
The speaker box according to claim 1, wherein the auxiliary cavity shell comprises an auxiliary front cover and an auxiliary rear cover which are mutually covered and fixed along the vibration direction of the diaphragm, and the auxiliary front cover includes an auxiliary front cover fixed on the The auxiliary front cover plate of the casing, the auxiliary front cover side wall bent and extended from the peripheral edge of the auxiliary front cover plate, and the through opening passing through the auxiliary front cover side wall, the auxiliary front cover side wall is provided with the One side of the through port is abutted and fixed on the casing, and the through port is communicated with the leakage port. The auxiliary rear cover is set and fixed on the side wall of the auxiliary front cover and is fixedly connected with the casing .
The speaker box according to claim 9, wherein the auxiliary front cover and the auxiliary rear cover are made of metal materials, and the auxiliary rear cover is welded and fixed to the auxiliary front cover to form the auxiliary cavity shell.