WO2022041461A1

WO2022041461A1 - Loudspeaker box

Info

Publication number: WO2022041461A1
Application number: PCT/CN2020/124383
Authority: WO
Inventors: 吴军; 印兆宇; 魏威; 刘忠原
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: 2020-10-28
Publication date: 2022-03-03
Also published as: CN112073851A

Abstract

Provided is a loudspeaker box, which comprises a housing, a sound production unit, and an annular support made of plastic. A rear sound cavity is jointly defined by the sound production unit and the housing. The sound production unit comprises a diaphragm. The housing comprises: a front cover made of a metal material; a rear cover that is made of a metal material and is fixed to the front cover in a covering manner; a sound outlet; and a sealing sheet made of a metal material, wherein the rear cover is provided with a through hole, the sealing sheet is fixed to the rear cover in a covering manner and completely covers the through hole, the sealing sheet is provided with a recess, and the recess is in communication with the through hole. The support is arranged around the sound outlet and encapsulates the periphery of the sound outlet so as to form a fixed connection with the front cover. The sound production unit is supported on the support, and the diaphragm faces toward the sound outlet. The support surrounds a peripheral side of the sound production unit and forms a sealed fixation with the sound production unit. The sound production unit, the support, the front cover, the rear cover and the sealing sheet jointly define the sealed rear sound cavity. Compared with the related art, the loudspeaker box in the present invention has a cavity body with a large volume, and has good acoustic 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, the front cover and the rear cover of the speaker box of the related art are injection-molded, and the sound-generating unit is sealed by ultrasonic welding. Ultrasonic welding requires more volume, thus limiting the volume design of the front cavity and the rear cavity. This 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 loudspeaker box with large cavity volume and good acoustic performance.

In order to achieve the above object, the present invention provides a speaker box, which includes a casing, a sound-generating unit fixedly accommodated in the casing, and a ring-shaped bracket made of plastic located in the casing. The sound-generating unit and the housing together form a rear sound cavity, the sound-generating unit includes a vibrating membrane for vibrating and sounding, the housing includes a front cover made of metal material, and a cover is fixed on the front cover A back cover made of metal material, a sound outlet provided through the front cover, and a sealing sheet made of metal material, the back cover is provided with a through hole passing through it, and the sealing sheet is covered and fixed On the side of the rear cover away from the front cover and completely covering the through hole, the side of the sealing sheet close to the through hole is recessed to form a groove in the direction away from the sounding unit. The groove communicates with the through hole; the bracket is arranged around the sound outlet and wraps the periphery of the sound outlet to form a fixed connection with the front cover, and the sound-emitting unit is supported on the bracket, so The diaphragm faces the sound outlet, the bracket is arranged around the periphery of the sound-emitting unit and is sealed and fixed with the sound-emitting unit, the sound-emitting unit, the bracket, the front cover, the The rear cover and the sealing sheet together form the airtight rear acoustic cavity.

Preferably, the orthographic projection of the groove along the vibration direction of the diaphragm coincides with the through hole.

Preferably, the sealing sheet further comprises a first reinforcing rib protruding and extending from the groove and connecting opposite sides of the groove.

Preferably, the rear cover further includes second reinforcing ribs located in the through holes and connecting opposite sides of the through holes, the second reinforcing ribs and the first reinforcing ribs are disposed opposite to each other and abut each other .

Preferably, the front cover includes a front cover body provided with the sound outlet, an outer side wall of the front cover extending from the outer peripheral edge of the front cover body toward the rear cover and fixedly connected to the rear cover, and The inner side wall of the front cover extends from the inner peripheral edge of the front cover body to the direction of the rear cover; the bracket includes an inner side wall of the front cover body and the inner side wall of the front cover. A bracket body and a bracket extension wall extending from the bracket body along the inner side wall of the front cover and wrapping the inner side wall of the front cover, the bracket extension wall is arranged around the periphery of the sounding unit and is connected with the sounding unit The monomer forms a hermetic fixation.

Preferably, the speaker box further includes a ventilating spacer located in the rear acoustic cavity, the ventilating spacer is attached to the sound-generating unit 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 and is attached to the sound-generating unit, and an spacer extension that is bent and extended from the periphery of the spacer body toward the bracket. and a spacer fixing portion bent and extended from one end of the spacer extending portion away from the spacer body; the spacer extending portion is spaced from the housing, and the spacer fixing portion is fixed to the spacer The side of the bracket body close to the rear cover; the ventilation spacer, the bracket, the front cover, the rear cover and the sealing sheet together form a powder filling space, and the powder filling space is used for filling 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 Both ends of the conductor body extend toward the sound-generating unit and are fixed and electrically connected to the connecting arm; and the conductor body extends away from the sound-generating unit and penetrates the casing an extension arm; a side of the bracket body close to the rear cover is recessed to form a receiving groove, and the conductive part body is arranged in the receiving groove so that the conductive part body and the bracket body are close to the back cover One side is flush, and the spacer fixing portion is press-fitted and fixed to the conductive element body and the bracket at the same time.

Preferably, the rear cover includes a rear cover body disposed opposite to the spacer body at a distance, and a peripheral edge of the rear cover body is bent and extended toward the front cover, and is abutted and fixed with the outer side wall of the front cover The extension arm penetrates through the outer side wall of the front cover and the side wall of the rear cover at the same time, the through hole is arranged on the rear cover body, and the sealing sheet is fixed on the rear cover body.

Preferably, a rubber ring is attached to a side of the front cover away from the rear cover, and the rubber ring is arranged around the sound outlet.

beneficial effect

Compared with the related art, in the speaker box of the present invention, the front cover, the rear cover and the sealing sheet of the shell are made of metal materials, and are fixed to the front cover by brackets made of plastic materials to support and fix the sounding unit. In the above structure, the plastic bracket is combined with the metal front cover, the metal front cover is combined with the metal rear cover, and the metal rear cover is combined with the metal sealing sheet. Under the premise of ensuring the structural strength of the casing, its Compared with the all-plastic shell structure, it can be designed to be thinner, thereby greatly increasing the volume of the cavity in the shell. More preferably, the rear cover is provided with a through hole, and the sealing sheet is provided with a groove, wherein the groove is communicated with the through hole, thereby further increasing the volume of the cavity in the housing. The above structure effectively increases the volume of the rear acoustic cavity enclosed by the sound-generating unit and the casing, thereby improving the acoustic performance of the speaker box, especially 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 a schematic three-dimensional structure diagram of another angle of the speaker box of the present invention;

Fig. 3 is the partial three-dimensional structure exploded schematic diagram of the speaker box of the present invention;

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

FIG. 5 is an enlarged view of the part shown in B in FIG. 4

6 is a schematic diagram of the three-dimensional assembly structure of the rear cover and the sealing sheet of the speaker box of the present invention;

7 is a schematic exploded view of the partial three-dimensional structure of FIG. 6;

FIG. 8 is an exploded schematic diagram of another partial three-dimensional structure of FIG. 7 .

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. 1-8 at the same time, the present invention provides a speaker box 100 , which includes a housing 1 , a sounding unit 2 having a diaphragm 21 fixedly accommodated in the housing 1 , and a speaker box 2 located in the housing 1 . Inside the bracket 3 made of plastic, the sounding unit 2 and the housing 1 together form a rear sound cavity 10 .

The housing 1 includes a front cover 11 made of a metal material, a back cover 12 made of a metal material covered and fixed on the front cover 11 , a sound outlet 13 provided through the front cover 11 , and a Sealing sheet 14 made of metal material.

The front cover 11 includes a front cover body 111 provided with the sound outlet 13 , a front cover extending from the outer periphery of the front cover body 111 toward the rear cover 12 and fixedly connected to the rear cover 12 . The outer side wall 112 and the front cover inner side wall 113 extending from the inner peripheral edge of the front cover body 111 to the rear cover 12 direction.

The back cover 12 includes a through hole 120 therethrough, a back cover body 121 disposed opposite to the sounding unit 2 at intervals, and a back cover body 121 is bent and extended toward the front cover 11 from the periphery of the back cover body 121 . The rear cover side wall 122 is fixed in abutment with the front cover outer side wall 112 . The through hole 120 is disposed in the rear cover body 121 .

In this embodiment, the front cover 11 is fixed by welding the outer side wall 112 of the front cover and the back cover side wall 122 of the rear cover. The structure can be designed thinner, and the fixing strength is more reliable.

The sealing sheet 14 is fixed to the rear cover body 121 . Specifically, the sealing sheet 14 is covered and fixed on the side of the rear cover 12 away from the front cover 11 and completely covers the through hole 12 .

The bracket 3 has a ring-shaped structure, and the sound-generating unit 2 includes a vibrating membrane 21 for vibrating and producing sound. The bracket 3 is arranged around the sound outlet 13 and wraps the periphery of the sound outlet 13 to form a fixed connection with the front cover 11 . Therefore, the sound-generating unit 2 , the bracket 3 , the front cover 11 , the rear cover 12 and the sealing sheet 14 together form the airtight rear sound cavity 10 .

In the above structure, the combined structure of the sealing sheet 14 , the front cover 11 , the rear cover 12 and the bracket 3 , because the sealing sheet 14 , the front cover 11 and the rear cover 12 are all made of metal materials, the metal front cover 11 and the metal rear cover are made of metal. The cover 12 is combined, the metal back cover 12 is combined with the metal sealing sheet 14, and is fixed with the front cover 11 through the bracket 3 made of plastic material to support and fix the sounding unit 2, in order to ensure the structural strength of the casing 1. Under the premise, it can not only be designed to be thinner than the all-plastic shell structure, but also effectively assemble the sounding unit 2, thereby greatly increasing the volume of the cavity in the casing 1 and effectively increasing the sounding unit. 2. The volume of the rear acoustic cavity 10 enclosed by the casing 1, thereby improving the acoustic performance of the speaker box 100, especially the low-frequency acoustic performance.

More preferably, in order to further increase the volume of the cavity in the housing 1 , the sealing sheet 14 closes to the through hole 12 and is recessed in the direction away from the sounding unit 2 to form a groove 140 , and the groove 140 is formed. communicate with the through hole 120 . The structure communicates with the through hole 120 through the groove 140 , thereby further increasing the volume of the cavity in the housing 1 . The above structure effectively increases the volume of the rear acoustic cavity 10 enclosed by the sound generating unit 2 and the housing 1 , thereby improving the acoustic performance of the speaker box 100 , especially the low-frequency acoustic performance.

In this embodiment, the groove 140 is formed by etching the sealing sheet 14 .

In this embodiment, the orthographic projection of the groove 140 along the vibration direction of the diaphragm 21 coincides with the through hole 120 . That is to say, the structure is in direct communication with the diaphragm 21 through the groove 140 , so that the volume of the cavity formed by the groove 140 and the through hole 120 is maximized, which is beneficial to improve the performance of the speaker box 100 . Low frequency acoustic performance.

In order to strengthen the strength of the sealing sheet 14 , in this embodiment, the sealing sheet 14 further includes first reinforcing ribs 141 that protrude and extend from the groove 140 and connect opposite sides of the groove 140 . The rear cover 12 further includes second reinforcing ribs 123 located in the through hole 120 and connecting opposite sides of the through hole 120 . The second reinforcing rib 123 and the first reinforcing rib 141 are disposed facing each other and are in contact with each other. This structure thus increases the strength of the sealing sheet 14 .

Please refer to FIG. 8 , which is an exploded schematic diagram of another partial three-dimensional structure of FIG. 7 . Both the second reinforcing rib 123 and the first reinforcing rib 141 have a cross structure, thereby increasing the strength of the sealing sheet 14 . More preferably, the second reinforcing rib 123 and the first reinforcing rib 141 are matched in shape and fixed integrally, thereby enhancing the strength of the integration of the rear cover 12 and the sealing sheet 14 into one body.

In this embodiment, a leakage portion 22 is provided on the side of the sound generating unit 2 away from the diaphragm 21 , and the leakage portion 22 communicates with the rear acoustic cavity 10 .

The side of the sound-emitting unit 2 with the diaphragm 21 faces the sound outlet 13 and is supported on the bracket 3 . The side of the sound-emitting unit 2 close to the diaphragm 21 is the sound-emitting side, which directly communicates with the outside world. Connected to form a positive sound structure. More preferably, a part of the sound-generating unit 2 is exposed to the sound-emitting device 13, which further increases the volume of the rear acoustic cavity 10, so as to further improve the low-frequency acoustic performance.

The bracket 3 includes a bracket body 31 and a bracket extension wall 32 extending from the bracket body 31 .

The bracket body 31 is located in the casing 1 and is abutted and fixed to the front cover body 111 and the front cover inner side wall 113 at the same time. The bracket extension wall 32 extends along the inner side wall 113 of the front cover and wraps the inner side wall 113 of the front cover, that is, the inner side wall 113 of the front cover is embedded in the bracket 3, so that the fixing reliability of the two is better. In this embodiment, the front cover 1 and the bracket 3 are integrally formed of plastic.

The bracket extension wall 32 is disposed around the periphery of the sound-generating unit 2 and forms a seal with the sound-generating unit 2, so that the rear acoustic cavity 10 forms a closed space for improving low-frequency acoustic performance.

In this embodiment, one end of the bracket extension wall 32 away from the rear cover 12 is flush with the front cover body 111 . This structural arrangement makes the structure of the bracket 3 and the front cover 11 consistent, and the overall appearance is more beautiful.

In order to further improve the low-frequency acoustic performance of the speaker device 100, the speaker box 100 further includes a ventilating spacer 4 located in the rear acoustic cavity 10, the ventilating spacer 4 is attached to the sound-emitting unit 2 and the The sound-generating unit 2 is separated from the rear acoustic cavity 10 , so that the rear acoustic cavity 10 can be filled with sound-absorbing material.

Specifically, the ventilating spacer 4 includes a spacer body 41 that is spaced apart from the back cover 12 and is attached to the sounding unit 1 , and is bent toward the bracket 3 from the periphery of the spacer body 41 . The spacer extension portion 42 that is folded and extended and the spacer fixing portion 43 that is bent and extended from the end of the spacer extension portion 42 away from the spacer body 41 can be bent and extended toward the direction close to the outer side wall 112 of the front cover. It can also be bent and extended in a direction away from the outer side wall 112 of the front cover. The spacer extending portion 42 is spaced apart from the housing 1 , and the spacer fixing portion 42 is fixed to the side of the bracket body 31 close to the rear cover 12 . The breathable spacer 4, the bracket 3, the front cover 11, the rear cover 12 and the sealing sheet 14 together form a powder filling space, and the powder filling space is used for filling sound-absorbing materials, such as sound-absorbing particles , sound-absorbing cotton, etc.

The speaker box 100 further includes a conductive member 5 that connects the sound generating unit 2 with external electrical signals. In this embodiment, the conductive member 5 includes a conductive member body 51 supported and fixed on one end of the bracket body 31 close to the rear cover 12 . A connecting arm 52 that extends and is fixed and electrically connected to the sounding unit 2 and an extension arm 53 that extends away from the sounding unit 2 from the conductor body 51 and penetrates through the housing 1 . In this embodiment, the extension arm 53 penetrates both the outer side wall 112 of the front cover and the side wall 122 of the rear cover. This structure is convenient for assembly. 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 4 is fixed to the bracket 3 and ensure that the sound-absorbing material in the powder filling space will not enter the sound-emitting unit 2 and affect its performance, in this embodiment, the bracket body 31 is close to the rear One side of the cover 12 is recessed to form a receiving groove 311 , and the conductive member body 51 is disposed in the receiving groove 311 so that the conductive member body 51 is flush with the side of the bracket body 31 close to the rear cover 12 . , the spacer fixing portion 43 is simultaneously press-fitted and fixed to the conductor body 51 and the bracket body 31 of the bracket 3 .

More preferably, in this embodiment, the side of the front cover 11 away from the rear cover 12 is fitted with a rubber ring 6 , and the rubber ring 6 is arranged around the sound outlet 13 . The arrangement of the rubber ring 6 is used to achieve fixed sealing with the entire terminal when the speaker element 100 is installed on the terminal. In this embodiment, the rubber ring 6 is a double-sided tape, of course, it is not limited to this, and can also be rubber, sponge, or the like.

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 includes a housing and a sound-generating unit fixedly accommodated in the housing, the sound-generating unit and the housing together form a rear acoustic cavity, and the sound-generating unit includes a vibrating unit for vibrating sound. The film is characterized in that the casing comprises a front cover made of metal material, a back cover made of metal material covered and fixed on the front cover, a sound outlet provided through the front cover, and a A sealing sheet made of metal material, the rear cover is provided with a through hole passing through it, the sealing sheet is covered and fixed on the side of the rear cover away from the front cover and completely covers the through hole, so The side of the sealing sheet close to the through hole is recessed in the direction away from the sounding unit to form a groove, and the groove is communicated with the through hole; A ring-shaped bracket is made, the bracket is arranged around the sound outlet and wraps the periphery of the sound outlet to form a fixed connection with the front cover, and the sound-emitting unit is supported on the bracket, The diaphragm faces the sound outlet, the bracket is arranged around the periphery of the sound-emitting unit and is sealed and fixed with the sound-emitting unit, the sound-emitting unit, the bracket, the front cover, The rear cover and the sealing sheet together form the airtight rear acoustic cavity.
The speaker box according to claim 1, wherein the orthographic projection of the groove along the vibration direction of the diaphragm coincides with the through hole.
The loudspeaker box according to claim 1, wherein the sealing sheet further comprises a first reinforcing rib protruding and extending from the groove and connecting opposite sides of the groove.
The speaker box according to claim 3, wherein the back cover further comprises a second reinforcing rib located in the through hole and connecting opposite sides of the through hole, and the second reinforcing rib is connected to the The first reinforcing ribs are arranged facing each other and abut each other.
The loudspeaker box according to claim 1, wherein the front cover comprises a front cover body provided with the sound outlet, extending from the outer periphery of the front cover body toward the rear cover and being connected with the sound outlet. The outer side wall of the front cover fixedly connected to the rear cover and the inner side wall of the front cover extending from the inner peripheral edge of the front cover body to the direction of the rear cover; The front cover body and the bracket body of the inner side wall of the front cover and the bracket extension wall extending from the bracket body along the inner side wall of the front cover and wrapping the inner side wall of the front cover, the bracket extension wall surrounds the sound The peripheral side of the unit is arranged and sealed and fixed with the sounding unit.
The speaker box according to claim 2, characterized in that, the speaker box further comprises a ventilating spacer located in the rear acoustic cavity, the ventilating spacer being attached to the sounding unit and making the sounding unit The body is separated from the rear acoustic cavity.
The speaker box according to claim 6, wherein the ventilating spacer comprises a spacer body which is spaced apart from the rear cover and is attached to the sound-generating unit, and is arranged from the periphery of the spacer body to the spacer body. The isolator extension part bent and extended in the bracket direction and the spacer fixing part bent and extended from one end of the isolator extension part away from the isolator body; the isolator extension part is arranged at intervals from the housing , the spacer fixing part is fixed on the side of the bracket body close to the rear cover; the breathable spacer, the bracket, the front cover, the rear cover and the sealing sheet together form a pot The powder space, the powder filling space is used to fill the 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, and the conductive member comprises a conductive member supported and fixed on the bracket body close to the A conductor body at one end of the back cover, a connecting arm extending from the two ends of the conductor body toward the sounding unit and being fixed and electrically connected to the sounding unit, and a connecting arm extending from the conductor body to the sounding unit away from the sounding unit The single body extends in the direction of the single body and penetrates the extension arm of the casing; the side of the bracket body close to the rear cover is recessed to form a receiving groove, and the conductive part body is arranged in the receiving groove and makes the conductive part body The spacer fixing portion is flush with the side of the bracket body close to the back cover, and the spacer fixing portion is pressed and fixed to the conductive member body and the bracket at the same time.
The speaker box according to claim 8, wherein the back cover comprises a back cover body disposed opposite to the spacer body at a distance, and a back cover body is bent and extended toward the front cover from a peripheral edge of the back cover body The rear cover side wall is fixed in contact with the outer side wall of the front cover, the extension arm penetrates the outer side wall of the front cover and the side wall of the rear cover at the same time, and the through hole is arranged in the rear cover body, so The sealing sheet is fixed on the rear cover body.
The speaker box according to claim 1, wherein a side of the front cover away from the rear cover is fitted with a rubber ring, and the rubber ring is arranged around the sound outlet.