WO2021109156A1

WO2021109156A1 - Loudspeaker box

Info

Publication number: WO2021109156A1
Application number: PCT/CN2019/123849
Authority: WO
Inventors: 高尚; 王程良
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: 2019-12-07
Filing date: 2019-12-07
Publication date: 2021-06-10

Abstract

The present utility model provides a loudspeaker box. A sound-producing monomer divides an accommodating space into a front cavity and a rear cavity. A baffle wall divides the rear cavity into a first rear cavity and a second rear cavity. A lower cover comprises a lower cover body, a protruding wall, a second through hole and a cover plate, wherein the lower cover body and the protruding wall jointly enclose a sound guide groove which is communicated with the second rear cavity. The first rear cavity communicates with the sound guide groove by means of the second through hole. The cover plate completely covers the second through hole. A second air-permeable spacer is attached to the protruding wall and completely covers the sound guide groove. The second rear cavity is filled with sound-absorbing particles, and a first air-permeable spacer and the second air-permeable spacer jointly encapsulate the sound-absorbing particles in the second rear cavity to form a virtual sound cavity. A part of the airflow in the second rear cavity enters the first rear cavity through the first air-permeable spacer, and the other part of the airflow bypasses the baffle wall and sequentially passes through the second air-permeable spacer, the sound guide groove and the second through hole to enter the first rear cavity. Compared with the prior art, the loudspeaker box provided by the present utility model is excellent in low-frequency acoustic performance.

Description

Speaker box

Technical field

The utility model relates to an electroacoustic device, in particular to a speaker box.

Background technique

With the advent of the mobile Internet era, the number of smart mobile devices continues to rise. Among many mobile devices, mobile phones are undoubtedly the most common and most portable mobile terminal devices. At present, the functions of mobile phones are extremely diverse, one of which is high-quality music functions. Therefore, speaker boxes for playing sound are widely used in today's smart mobile devices.

The speaker box of the related art includes a lower cover, an upper cover assembled with the lower cover to form an accommodating space, a sound-producing monomer accommodated in the accommodating space, a blocking wall formed in the accommodating space, and air-permeable isolation The sounding monomer and the upper cover enclose a front cavity, the sounding monomer, the upper cover and the lower cover jointly enclose a rear cavity; the retaining wall separates the rear cavity into each other The first back cavity and the second back cavity are connected, the sound emitting monomer is located in the first back cavity, and the second back cavity is filled with sound-absorbing particles; the blocking wall is provided with a through hole penetrating therethrough, so The air-permeable spacer completely covers the through hole, and the air-permeable spacer encapsulates the sound-absorbing particles in the second rear cavity to form a virtual acoustic cavity so as to improve the low-frequency acoustic performance of the speaker box.

technical problem

However, in the related art speaker box, the area of the air-permeable spacer for air-permeability depends on the size of the through hole, and because the area of the baffle is smaller than that of the second rear cavity, it contributes to the formation of The number of the sound-absorbing particles in the virtual acoustic cavity is insufficient, which affects the acoustic performance. In addition, the second rear cavity has a long and narrow structure extending away from the sound-producing monomer, and the sound-absorbing particles that are easily far away from the air-permeable isolator are difficult to exert, so that the volume of the virtual sound cavity in the second rear cavity is changed. Small, which in turn reduces the low-frequency acoustic performance of the speaker box.

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

Technical solutions

The purpose of the utility model is to provide a loudspeaker box with good audio performance, especially low frequency performance.

In order to achieve the above objective, the present invention provides a speaker box, which includes a lower cover, an upper cover covered by the lower cover and enclosing a containing space, a sounding unit contained in the containing space, A barrier wall, a first air-permeable partition, and a second air-permeable partition formed in the receiving space; the sound-producing monomer separates the receiving space into a front cavity and a rear cavity, and the barrier wall is located in the rear cavity The rear cavity is divided into a first rear cavity and a second rear cavity, the sound-producing monomer is located in the first rear cavity, the blocking wall is provided with a first through hole penetrating therethrough, and the first The air-permeable spacer is attached to the blocking wall and completely covers the first through hole, and is characterized in that: the lower cover includes a lower cover body that covers the upper cover and jointly encloses the accommodating space, The lower cover body has an annular convex wall extending toward the second rear cavity, a second through hole penetrating the lower cover body, and a cover plate covering the lower cover body, the lower cover body A sound guide groove is enclosed with the convex wall, the sound guide groove is in communication with the second rear cavity, and the orthographic projection of the sound guide groove toward the upper cover completely falls into the second rear cavity The orthographic projection of the second through hole to the upper cover direction simultaneously falls into the first rear cavity, the retaining wall and the second rear cavity, and the second through hole connects the first rear cavity The cavity is in communication with the sound guide groove; the cover plate completely covers the second through hole; the second air-permeable spacer is attached to the convex wall and completely covers the sound guide groove, the second The rear cavity is filled with sound-absorbing particles, and the first air-permeable spacer and the second air-permeable spacer jointly encapsulate the sound-absorbing particles in the second rear cavity to form a virtual acoustic cavity; A part of the airflow enters the first rear cavity through the first air-permeable spacer, and the other part of the air passes through the second air-permeable spacer, the sound guide groove, and the second through hole in turn around the barrier wall. Enter the first rear cavity.

Preferably, the cover plate is provided on a side of the lower cover away from the upper cover, and the thickness of the cover plate is smaller than the thickness of the lower cover.

Preferably, the second air-permeable spacer is fixed to the convex wall by hot melt.

Preferably, the upper cover is provided with a can powder hole penetrating therethrough and a cover provided on the can powder hole, and the can powder hole is in communication with the second rear cavity.

Preferably, the cover plate is made of PET material.

Preferably, the first through holes include at least two and are spaced apart from each other.

Beneficial effect

Compared with the related art, the speaker box of the present invention divides the rear cavity into a first rear cavity and a second rear cavity by arranging a barrier wall. The two through holes are in communication with the first back cavity, and the sound guide groove is in communication with the second back cavity; the cover is provided on the lower cover body and completely covers the second through hole to form a seal in the back cavity; the blocking wall is provided with a second back cavity A through hole, the first air-permeable spacer completely covers the first through-hole, the second air-permeable spacer is attached to the convex wall and is spaced from the cover plate, and the second air-permeable spacer completely covers the sound guide groove so as to be connected to the first The air-permeable spacers jointly encapsulate the sound-absorbing particles in the second back cavity to form a virtual sound cavity. In the above structure, the second air-permeable spacer, the cover plate, and the second through hole together form an air guiding channel structure connecting the first rear cavity and the second rear cavity, which realizes low-frequency sound generation performance. Wherein, the sound guide groove extends in a direction away from the blocking wall, so that the sound-absorbing particles far away from the first air-permeable spacer can also perform better, thereby increasing the volume of the virtual sound cavity formed by the second back cavity, thereby effectively improving Improve the low-frequency acoustic performance of the speaker box.

Description of the drawings

Figure 1 is a schematic diagram of the three-dimensional structure of the speaker box of the present invention;

Figure 2 is an exploded view of a part of the three-dimensional structure of Figure 1;

Figure 3 is a cross-sectional view taken along line A-A in Figure 1;

Figure 4 is an assembly diagram of the lower cover and the retaining wall of the speaker box of the present invention.

Embodiments of the present invention

The utility model will be further described below in conjunction with the drawings and the embodiments.

Please refer to FIGS. 1-4 at the same time. The present invention provides a speaker box 100, which includes a lower cover 1, an upper cover 2, a sound-producing monomer 3, a blocking wall 4, a first air-permeable spacer 5, and a second air-permeable spacer 6 .

The lower cover 1 and the upper cover 2 are assembled together to form a receiving space 7. In this embodiment, the upper cover 2 and the lower cover 1 are assembled by ultrasonic welding.

The lower cover 1 includes a lower cover body 11 that covers the upper cover 2 and collectively encloses the accommodating space 7, and a ring-shaped convex wall 12 extending from the lower cover body 11 to the accommodating space 7 , The second through hole 101 passing through the lower cover body 11 and the cover plate 13 covering the lower cover body 11.

The upper cover 2 is provided with a can powder hole 21 penetrating the upper cover 2 and a cover 22 covering the can powder hole 21.

The sound emitting unit 3 is accommodated in the accommodation space 7. The sounding monomer 3 divides the receiving space 7 into a front cavity 71 and a rear cavity 72. In this embodiment, the sound emitting monomer 3 and the upper cover 2 enclose the front cavity 71 for sound; the sound emitting monomer 3, the lower cover 1 and the upper cover 2 jointly surround The rear cavity 72 is formed to improve low-frequency acoustic performance.

The blocking wall 4 is formed in the receiving space 7. The blocking wall 4 is located in the rear cavity 72 and divides the rear cavity 72 into a first rear cavity 721 and a second rear cavity 722. In this embodiment, the blocking wall 4 connects the upper cover 2 and the lower cover 1. The convex wall 12 is formed by the lower cover body 11 extending toward the second rear cavity. The sound emitting monomer 3 is located in the first rear cavity 721; the second rear cavity 722 is filled with sound-absorbing particles (not shown) to form a virtual sound cavity (ie D-Bass sound cavity) for improving low-frequency acoustics performance.

Specifically, the powder can hole 21 is in communication with the second rear cavity 722, and the sound-absorbing particles are filled into the second back cavity 722 through the powder can hole 21, and then sealed by a cover 22.

The lower cover body 11 and the convex wall 12 jointly enclose a sound guide groove 102. In this embodiment, the sound guide groove 102 is formed by recessing a side of the lower cover 1 close to the upper cover 2 in a direction away from the upper cover 2. The sound guide groove 102 communicates with the second rear cavity. The orthographic projection of the sound guide groove 102 toward the upper cover 2 completely falls into the second rear cavity 722.

The second through hole 101 penetrates the lower cover 1. The orthographic projection of the second through hole 101 toward the upper cover 2 simultaneously falls into the first rear cavity 721, the blocking wall 4 and the second rear cavity 722, and the second through hole 101 will The first rear cavity 721 communicates with the sound guide groove 102.

The cover plate 13 completely covers the second through hole 101. In this embodiment, the cover plate 13 is provided on the side of the lower cover 1 away from the upper cover 2.

In this embodiment, the sound guide groove 102 and the second through hole 722 are integrally formed through a mold inclined top molding process, which saves assembly procedures and improves production efficiency.

In this embodiment, the cover plate 13 is made of PET material. Of course, it is not limited to this, and the cover plate 13 may also be a steel sheet with a thickness of 0.15 mm. Of course, the material and size of the cover plate 13 are not limited to this, as long as the Young's modulus of the cover plate 13 is greater than that of the lower cover 1, so that the thickness can be reduced relative to the cover plate while ensuring the strength.

In this embodiment, the first air-permeable spacer 5 and the second air-permeable spacer 6 jointly encapsulate the sound-absorbing particles in the second rear cavity 722 to form a virtual acoustic cavity.

The blocking wall 4 is provided with a first through hole 40 passing through it.

The first air-permeable spacer 5 is attached to the barrier wall 4 and completely covers the first through hole 40, and the first air-permeable spacer 5 encapsulates the sound-absorbing particles in the second rear cavity 722 Inside to form a virtual sound cavity. In this embodiment, the first through holes 40 include at least two and are spaced apart from each other. The arrangement of the two first through holes 40, on the one hand, increases the overall ventilation area of the first through holes 40, and on the other hand, the part between the adjacent first through holes 40 is the first through hole 40. An air-permeable spacer 5 provides a supporting position, which improves the reliability of the first air-permeable spacer 5.

The second air-permeable spacer 6 is attached to the side of the lower cover 1 close to the upper cover 2. The second air-permeable spacer 6 is fixed to the lower cover 1 by hot melt. In this embodiment, the second air-permeable spacer 6 is fixed to the convex wall 12 by hot melt. The second air-permeable spacer 6 completely covers the sound guide groove 102. The second air-permeable spacer 6 encapsulates the sound-absorbing particles in the second rear cavity 722.

That is to say, in the above structure, the sound guide groove 102 and the second through hole 101 are provided by using the thickness space of the lower cover 1, and the second air-permeable spacer 6 and the cover plate 13 are respectively covered on the lower cover 1. The two sides are spaced apart, so that the second air-permeable spacer 6, the cover plate 13, the sound guide groove 102, and the second through hole 101 collectively enclose the first rear cavity 721 and The air guide channel structure of the second rear cavity 722, and the air flow of the first rear cavity 721 enters the second rear cavity 722 through the air guide channel structure to achieve a low-frequency acoustic effect.

A part of the air flow in the second rear cavity 722 enters the first rear cavity 721 through the first air-permeable spacer 5, and the other part bypasses the barrier wall 4 and sequentially passes through the second air-permeable spacer 6, After the sound guide groove 102 and the second through hole 101 enter the first rear cavity 721, as shown by the arrow in FIG. 3. . More preferably, the sound guide groove 102 extends in a direction away from the blocking wall 4. That is to say, because the air guiding channel is structured to extend along the length of the second back cavity 722, the sound-absorbing particles in the second back cavity 722 far away from the first back cavity 721 can also fully interact with the air guiding particles. The air circulation of the channel fully exerts its function of improving the low-frequency acoustic performance, so that the volume of the virtual sound cavity formed by the second rear cavity becomes larger, so that the low-frequency acoustic performance of the speaker box 100 is better.

Compared with the related art, the speaker box of the present invention divides the rear cavity into a first rear cavity and a second rear cavity by arranging a barrier wall. The two through holes are in communication with the first back cavity, and the sound guide groove is in communication with the second back cavity; the cover is provided on the lower cover body and completely covers the second through hole to form a seal in the back cavity; the blocking wall is provided with a second back cavity A through hole, the first air-permeable spacer completely covers the first through-hole, the second air-permeable spacer is attached to the inner side of the lower cover and is spaced from the cover plate, and the second air-permeable spacer completely covers the sound guide groove so as to be in contact with The first air-permeable spacer jointly encapsulates the sound-absorbing particles in the second back cavity to form a virtual sound cavity. In the above structure, the second air-permeable spacer, the cover plate, and the second through hole together form an air guiding channel structure connecting the first rear cavity and the second rear cavity, which realizes low-frequency sound generation performance. Wherein, the sound guide groove extends in a direction away from the blocking wall, so that the sound-absorbing particles far away from the first air-permeable spacer can also perform better, thereby increasing the volume of the virtual sound cavity formed by the second back cavity, thereby effectively improving Improve the low-frequency acoustic performance of the speaker box.

The above are only the embodiments of the utility model, and do not limit the patent scope of the utility model. Any equivalent structure or equivalent process transformation made by using the description and drawings of the utility model, or directly or indirectly applied to other Related technical fields are included in the scope of patent protection of the utility model in the same way.

Claims

A loudspeaker box comprising a lower cover, an upper cover arranged on the lower cover and enclosing a containing space, a sounding unit contained in the containing space, and a retaining wall formed in the containing space And a first air-permeable partition; the sound-producing monomer separates the receiving space into a front cavity and a rear cavity, and the blocking wall is located in the rear cavity and separates the rear cavity into a first rear cavity and a second rear cavity Cavity, the sounding monomer is located in the first rear cavity, the barrier wall is provided with a first through hole penetrating therethrough, and the first air-permeable spacer is attached to the barrier wall and completely covers the The first through hole is characterized by:

The lower cover includes a lower cover body covering the upper cover and jointly enclosing the accommodating space, a ring-shaped convex wall extending from the lower cover body to the second rear cavity, and penetrating the lower cover body. The second through hole of the cover body and the cover plate covering the lower cover body, the lower cover body and the convex wall jointly enclose a sound guide groove, and the sound guide groove communicates with the second rear cavity , And the orthographic projection of the sound guide groove toward the upper cover completely falls into the second rear cavity; and the orthographic projection of the second through hole toward the upper cover falls into the first rear cavity at the same time , The baffle wall and the second back cavity, the second through hole connects the first back cavity and the sound guide groove; the cover plate completely covers the second through hole;

The speaker box further includes a second air-permeable spacer, the second air-permeable spacer is attached to the convex wall and completely covers the sound guide groove, the second rear cavity is filled with sound-absorbing particles, and the second rear cavity is filled with sound-absorbing particles. A gas-permeable spacer and the second gas-permeable spacer jointly encapsulate the sound-absorbing particles in the second rear cavity to form a virtual sound cavity; a part of the airflow in the second rear cavity passes through the first gas-permeable spacer After entering the first rear cavity, another part of the first rear cavity bypasses the barrier wall and sequentially passes through the second air-permeable spacer, the sound guide groove, and the second through hole, and then enters the first rear cavity.
The speaker box according to claim 1, wherein the cover plate is provided on a side of the lower cover away from the upper cover.
The speaker box according to claim 1, wherein the thickness of the cover plate is smaller than the thickness of the lower cover.
The speaker box according to claim 1, wherein the second air-permeable partition is fixed to the convex wall by hot melt.
The loudspeaker box according to claim 1, wherein the upper cover is provided with a can powder hole penetrating therethrough and a cover provided on the can powder hole, the can powder hole and the second The back cavity is connected.
The speaker box according to claim 1, wherein the cover plate is made of PET material.
The loudspeaker box according to claim 1, wherein the first through hole includes at least two and is spaced apart from each other.