WO2021000106A1

WO2021000106A1 - Loudspeaker enclosure

Info

Publication number: WO2021000106A1
Application number: PCT/CN2019/094003
Authority: WO
Inventors: 任莉; 吴军
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技(新加坡)有限公司
Priority date: 2019-06-29
Filing date: 2019-06-29
Publication date: 2021-01-07
Also published as: CN210093483U

Abstract

The present application provides a loudspeaker enclosure, comprising an upper housing, a lower housing which fits with the upper housing to form an accommodating space, and a sound-emitting unit accommodated in the accommodating space; said sound-emitting unit divides the accommodating space into a front chamber and a rear chamber; the upper housing comprises a top wall arranged opposite to the diaphragm, a through-hole arranged running through the top wall, and a steel sheet disposed completely covering the through-hole; the loudspeaker enclosure further comprises a recessed part formed as a recess from the steel sheet in the direction of the accommodation space, and a cover plate; the cover plate cooperates with the recessed part to form a resonant chamber; the resonant chamber is in communication with the front chamber. In comparison with the related art, the loudspeaker enclosure provided by the present application has better acoustic performance.

Description

Speaker box

Technical field

This application relates to the field of electro-acoustic conversion, in particular to a speaker box.

Background technique

In recent years, with the rapid development of mobile communication technology, consumers have increasingly used mobile communication devices with voice functions, such as portable phones, handheld game consoles, and laptop computers. The speaker box is used as a voice playback device, and its design directly affects the voice performance of mobile communication equipment products. In order to meet the market's demand for thinness and high sound quality, higher requirements are put forward for the design of the speaker box.

In the related art, the speaker box includes an upper shell, a lower shell, and a sound-producing unit. The sound-producing unit includes a diaphragm. The diaphragm is separated from the upper case to form a front sound cavity. The sound guide channel is formed on the side wall of the upper case, the front sound cavity and the sound guide. The channel forms the front cavity, and this structure will produce a resonance peak in the high frequency response; with the popularization of stereo applications on mobile phones, speakers no longer pursue high high frequency response, and high frequency response (especially 4000Hz to 6000Hz) High can cause poor sound quality such as harsh sound and sharp labial and tooth sound.

Therefore, it is necessary to provide a new speaker box to solve the above-mentioned drawbacks.

technical problem

The main technical problem solved by this application is how to effectively reduce the high-frequency resonance peak value and sensitivity of the speaker box.

Technical solutions

In order to solve the above technical problems, the present application provides a speaker box, which includes an upper shell, a lower shell that cooperates with the upper shell to form a receiving space, and a sounding unit accommodated in the receiving space. The accommodating space is divided into a front cavity and a rear cavity, the sound emitting monomer includes a diaphragm for vibrating and sounding, and the diaphragm and the upper shell are spaced apart to form a front sound cavity, and the upper shell is formed with the A sound guide channel between the front acoustic cavity and the outside, the sound guide channel and the front acoustic cavity together constitute the front cavity, the upper shell includes a top wall disposed opposite to the diaphragm, and a communication channel disposed through the top wall A hole and a steel sheet covering the through hole, the speaker box further includes a recess formed from the steel sheet toward the receiving space, and a cover plate covering the recess, the cover The plate cooperates with the concave portion to form a resonant cavity, and the resonant cavity communicates with the front cavity.

In a preferred embodiment of the speaker box provided by the present application, the through hole and the resonant cavity are respectively communicated with the front acoustic cavity, and the recessed portion is penetrated with a first port communicating with the front cavity , The side of the recessed portion away from the sound-emitting unit is surrounded by a second through opening communicating with the outside, and the cover plate is provided on the second through opening and fixed to the recessed portion.

In a preferred embodiment of the speaker box provided by the present application, the upper shell further includes a through hole extending from a side of the top wall close to the sound emitting unit toward the lower shell and surrounding the through hole A supporting wall and a receiving wall extending from the side of the top wall close to the sounding monomer toward the lower shell are provided, the supporting wall is used to fix the sounding monomer, and the receiving wall is located in the The supporting wall is away from one side of the sound emitting monomer and is arranged around the resonant cavity.

In a preferred embodiment of the speaker box provided by the present application, the supporting wall is provided with a gap corresponding to the first through opening, and the gap is connected with the first through opening.

In a preferred embodiment of the speaker box provided by the present application, the resonant cavity communicates with the front acoustic cavity through the first through opening and the gap.

In a preferred embodiment of the speaker box provided by the present application, the resonant cavity and the sound guide channel are respectively arranged on opposite sides of the sound emitting monomer.

In a preferred embodiment of the speaker box provided by the present application, the top wall, the receiving wall and the supporting wall are integrally formed, and the steel sheet is fixed to the outer surface of the top wall by injection molding.

In a preferred embodiment of the speaker box provided by the present application, the orthographic projection of the steel sheet toward the lower shell simultaneously falls into the sound guide channel and the front acoustic cavity.

In a preferred embodiment of the speaker box provided by the present application, the upper shell and the lower shell are fixed by ultrasonic sealing.

In a preferred embodiment of the speaker box provided by the present application, the cover plate is a PET film.

Beneficial effect

Compared with the prior art, the speaker box provided by the present application is provided with a resonant cavity connected to the front acoustic cavity on the steel sheet. On the one hand, the volume of the front cavity is changed to increase the cavity volume of the front cavity and improve the high-frequency acoustic performance. On the one hand, by changing the size of the gap and the opening of the first port, the effect of different frequency response curves can be obtained, which effectively reduces the Q value (quality factor value) and sensitivity of the high frequency resonance peak of the speaker box, and improves The high-frequency sense of hearing makes the acoustic performance of the speaker box better.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. Those of ordinary skill in the art can obtain other drawings based on these drawings without creative work, among which:

Figure 1 is a perspective view of a certain perspective of the speaker box provided by this application;

Figure 2 is an exploded view of the speaker box in Figure 1;

Figure 3 is an enlarged structural view of the steel sheet in Figure 3;

Figure 4 is a perspective view of another perspective of the speaker box provided by this application;

Fig. 5 is a sectional view taken along the line V-V in Fig. 4;

The best mode of the invention

The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of this application.

Please refer to Figures 1-5. Figure 1 is a perspective view of the speaker box provided by this application; Figure 2 is an exploded view of the speaker box in Figure 1; Figure 3 is an enlarged structural view of the steel sheet in Figure 3; 4 is another perspective view of the speaker box provided by this application; FIG. 5 is a cross-sectional view along line VV in FIG. 4. The present application provides a speaker box 100, which includes an upper shell 1, a lower shell 2, a sound-producing monomer 3 with a diaphragm 31, a cover plate 4, a resonant cavity 10, a front acoustic cavity 20, a sound guide channel 30, a front cavity 40, and After the cavity 50.

The upper shell 1 and the lower shell 2 are fixed by ultrasonic sealing. The upper shell 1 is used to carry and protect the sound emitting monomer 3, the lower shell 2 is arranged on the upper shell 1 and cooperates with the upper shell 1 to form a receiving space, and the sound emitting monomer 3 is accommodated in The receiving space is divided into the front cavity 40 and the rear cavity 50. The diaphragm 31 is used for vibrating and sounding, the upper shell 1 and the diaphragm 31 are spaced apart to form the front acoustic cavity 20, and the sound guide channel 30 is formed in the upper shell 1 and communicates with the front acoustic cavity 20 and the outside. The front acoustic cavity 20 and the sound guide channel 30 together form the front cavity 40 for conducting sound to the outside. The upper shell 1, the lower shell 2 and the diaphragm 31 cooperate The back cavity 50 is formed.

The upper shell 1 includes a top wall 11 disposed opposite to the diaphragm 31, a through hole 111 penetrating through the top wall 11 and communicating with the front acoustic cavity 20, and a steel sheet 12 completely covering the through hole 111 And a support wall 13 extending from the top wall 11 close to the sounding monomer 3 in the direction of the lower shell 2 and arranged around the through hole 111, and extending from the inner side of the top wall 11 toward the lower shell 2 Preferably, the top wall 11, the containing wall 14, and the support 13 are integrally formed, the steel sheet 12 is fixed on the outer surface of the top wall 11 by injection molding, and the steel The sheet 12 is arranged flush with the top wall 11, and such a structure does not occupy the height space of the speaker box 100, which is beneficial to meet the design requirements of the speaker box 100 to be thin and light.

The steel sheet 12 is fixed on the outer surface of the top wall 11 by injection molding, and the steel sheet 12 is provided with a recessed portion 121 extending in the direction of the lower shell 2, and the recessed portion 121 penetrates The first port 1211 communicating with the front cavity 40 and the side of the recessed portion 121 away from the sounding unit 3 are surrounded by a second port 1212 communicating with the outside, and the cover plate 4 is provided on the The second opening 1212 is sealed and fixed to the recessed portion 121, the cover plate 4 and the recessed portion 121 cooperate to form a resonant cavity 10, and the resonant cavity 10 is arranged outside the supporting wall 13, and The resonant cavity 10 and the front cavity 40 communicate with each other to form a resonant structure of the resonant cavity 10 and the front cavity 40. Specifically, a side of the supporting wall 13 close to the recessed portion 121 is provided with a notch 131 penetrating through the supporting wall 13, the first through opening 1211 is provided at a position corresponding to the notch 131, and the notch 131 and The first port 1211 communicates with each other, and further, the resonant cavity 10 communicates with the front acoustic cavity 20 through the first port 1211 and the gap 131. The resonant cavity 10 and the sound guide channel 30 are respectively arranged on opposite sides of the sound emitting monomer 3.

In addition, because the thickness of the steel sheet 12 is much smaller than the thickness of the top wall 11, a part of the top wall 11 is replaced with the steel sheet 12. The steel sheet 12 disposed directly opposite the connection between the sound guide channel 30 and the front sound cavity 20 greatly increases the sound output height of the sound guide channel 30, and this structure is beneficial to the front cavity 40 The sound airflow is smooth, thereby effectively improving the acoustic performance and hearing sense of the speaker box 100.

The orthographic projection of the steel sheet 12 toward the lower shell 2 falls into the sound guide channel 30 and the front acoustic cavity 20 at the same time. That is, the steel sheet 12 is directly facing the connection between the sound guide channel 30 and the front acoustic cavity 20. The steel sheet 12 is harder than the top wall 11, that is, the amount of Young's film of the steel sheet 12 is greater than the amount of Young's film of the top wall 11. This structure can be used to reduce the total amount of the speaker box 100. The harmonic peak distortion of the front cavity 40 improves its acoustic performance.

The supporting wall 13 is used to hold the sound emitting monomer 3 and the supporting wall 13 and the sound emitting monomer 3 are fixed by glue. In this way, the sound emitting monomer 3 and the supporting wall 13 can form a firm connection structure.

The receiving wall 14 is connected to a side of the supporting wall 13 away from the sound emitting unit 3 and arranged around the resonant cavity 10, and the surrounding shape of the receiving wall 14 and the supporting wall 13 is the same as that of the The shape of the recess 121 matches.

The cover plate 4 is a PET film made of PET material. The PET cover plate 4 is arranged directly opposite to the recess 121 and is sealed with the steel sheet 12. PET material has high strength, light weight, excellent wear resistance, dimensional stability, creep resistance and fatigue resistance, and is cheap and has a high cost performance.

The above are only examples of this application, and do not limit the scope of this application. Any equivalent structure or equivalent process transformation made using the content of the description and drawings of this application, or directly or indirectly applied to other related technologies In the same way, all fields are included in the scope of patent protection of this application. .

Embodiments of the invention

Type here a paragraph describing the embodiment of the present invention.

Industrial applicability

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Sequence Listing Free Content

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Claims

A speaker box includes an upper shell, a lower shell that cooperates with the upper shell to form an accommodation space, and a sounding monomer accommodated in the accommodation space. The sounding monomer divides the accommodation space into a front cavity and In the rear cavity, the sound-producing monomer includes a diaphragm for vibrating and sounding, and the diaphragm and the upper shell are spaced apart to form a front acoustic cavity, and the upper shell is formed with a sound guide channel connecting the front acoustic cavity and the outside, The sound guide channel and the front acoustic cavity jointly constitute the front cavity, wherein the upper shell includes a top wall disposed opposite to the diaphragm, a through hole disposed through the top wall, and a cover disposed on the top wall. According to the steel sheet of the through hole, the speaker box further includes a recessed portion recessed from the steel sheet toward the accommodating space, and a cover plate covering the recessed portion, and the cover plate matches the recess The part forms a resonant cavity, and the resonant cavity is in communication with the front cavity.
The speaker box according to claim 1, wherein the through hole and the resonant cavity are respectively communicated with the front acoustic cavity, and the recessed portion is penetrated with a first port communicating with the front cavity, so The side of the recessed portion away from the sound emitting unit is surrounded by a second through opening communicating with the outside, and the cover plate is provided on the second through opening and fixed to the recessed portion.
The loudspeaker box according to claim 2, wherein the upper shell further comprises a side of the top wall close to the sound-producing monomer and extending in the direction of the lower shell and arranged around the through hole. A supporting wall and a containing wall extending from the side of the top wall close to the sounding monomer toward the lower shell, the supporting wall is used to fix the sounding monomer, and the containing wall is located on the supporting wall It is arranged away from the side of the sound emitting monomer and surrounds the resonant cavity.
The speaker box according to claim 3, wherein the supporting wall is provided with a gap corresponding to the first through opening, and the gap is communicated with the first through opening.
The speaker box according to claim 4, wherein the resonant cavity communicates with the front acoustic cavity through the first through opening and the gap.
The speaker box according to claim 1, wherein the resonant cavity and the sound guide channel are respectively arranged on opposite sides of the sound emitting monomer.
The speaker box according to claim 3, wherein the top wall, the receiving wall and the supporting wall are integrally formed, and the steel sheet is fixed to the outer surface of the top wall by injection molding.
The speaker box according to claim 1, wherein the orthographic projection of the steel sheet toward the lower shell simultaneously falls into the sound guide channel and the front sound cavity.
The speaker box according to claim 1, wherein the upper shell and the lower shell are fixed by ultrasonic sealing.
The speaker box of claim 1, wherein the cover plate is a PET film.