WO2022000543A1

WO2022000543A1 - Loudspeaker box

Info

Publication number: WO2022000543A1
Application number: PCT/CN2020/101478
Authority: WO
Inventors: 李红; 田建东
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: 2020-06-29
Filing date: 2020-07-10
Publication date: 2022-01-06
Also published as: CN212628263U

Abstract

Provided is a loudspeaker box, comprising a housing having an accommodation space, and a sound production unit and an air-permeable separator, which are accommodated in the accommodation space, wherein the sound production unit divides the accommodation space into a front cavity and a rear cavity; the rear cavity comprises a first rear cavity and a second rear cavity which are in airy communication by means of the air-permeable separator; the sound production unit, the housing and the air-permeable separator enclose to form the first rear cavity, and the housing and the air-permeable separator enclose to form the second rear cavity; the second rear cavity is filled with sound absorption particles; and the first rear cavity is internally provided with a sound absorption member used for blocking airflow. The loudspeaker box provided in the present utility model effectively improves the acoustic performance of a loudspeaker box having a virtual sound cavity with a large length.

Description

speaker box

technical field

The utility model relates to the field of sound and electricity, in particular to a speaker box.

Background technique

In order to improve the low-frequency acoustic performance of the speaker box, sound-absorbing particles are usually filled in the auxiliary sound cavity of the speaker box to form a D-BASS virtual sound cavity.

technical problem

However, when the length of the D-BASS virtual cavity is long, the study found that after a long-term power experiment (above 48H), the bass movement is violent and will cause serious wear of the bass particles, causing a huge change in the lowest resonance frequency (F0) and a decrease in the amplitude. The capacity expansion effect is lost, and the low frequency performance is reduced. When installed in a mobile terminal, the power consumption of the whole machine becomes higher.

Therefore, there is a need to provide a speaker enclosure that slows bass movement and reduces wear to bass particles.

technical solutions

The purpose of the utility model is to provide a loudspeaker box to solve the technical problem of serious abrasion of bass particles caused by the violent movement of the bass.

In order to achieve the purpose of the present utility model, the technical solutions provided are as follows: a speaker box, comprising a shell with a receiving space, a sound-emitting unit and a ventilating spacer accommodated in the receiving space, and the sound-emitting unit connects the The accommodating space is divided into a front cavity and a rear cavity; the rear cavity includes a first rear cavity and a second rear cavity that are air-connected through the air-permeable spacer, the sound-producing unit, the housing and the air-permeable spacer The first rear cavity is formed by enclosing the housing and the air-permeable spacer to form the second rear cavity; wherein, the second rear cavity is filled with sound-absorbing particles, and the first rear cavity is There is a sound-absorbing part inside to block the airflow.

Further, the sound-absorbing member is sound-absorbing cotton.

Further, the sound-absorbing cotton is fixed to the air-permeable spacer and extends from the air-permeable spacer toward the first rear cavity.

Further, the length direction of the air-permeable spacer is the same as the length direction of the second rear cavity, and at least two sound-absorbing cottons are provided, and at least two of the sound-absorbing cottons are along the length of the second rear cavity. Orientation interval distribution.

Further, the sound-absorbing cotton extends along the width direction of the air-permeable spacer.

Further, the side of the sound-absorbing cotton away from the air-permeable spacer abuts against the casing.

Further, the housing includes an upper cover, a lower cover fixed on the upper cover, and a back plate fixed on the side of the upper cover away from the lower cover, and the ventilation spacer is fixed on the upper cover The cover is located between the lower cover and the back plate; the upper cover and the sounding unit are enclosed to form the front cavity, the sounding unit, the lower cover, the upper cover and the The first rear cavity is enclosed by the air-permeable spacer, and the second rear cavity is enclosed by the upper cover, the air-permeable spacer and the back plate; the sound-absorbing cotton is far away from the air-permeable spacer. The side abuts against the lower cover.

Further, the upper cover is provided with a surrounding wall extending in the direction of the lower cover and spaced from the lower cover, and the air-permeable spacer is fixed to the surrounding wall.

Further, the speaker box further includes a powder filling hole provided through the back plate, and the powder filling hole communicates with the second rear cavity.

beneficial effect

The beneficial effect of the utility model is that: by filling the second rear cavity with sound-absorbing particles, the second rear cavity forms a D-BASS virtual sound cavity, so as to improve the low-frequency acoustic performance of the speaker box. When the length of the second rear cavity is relatively large, by arranging the sound-absorbing cotton in the first rear cavity, the sound-absorbing cotton blocks the airflow entering the second rear cavity from the first rear cavity, thereby slowing down the movement of the sound-absorbing particles. Reduce the wear caused by the vigorous movement of the sound-absorbing particles, thereby reducing the change of the lowest resonant frequency (F0) caused by the wear of the sound-absorbing particles. Therefore, the acoustic performance of the speaker box with a large virtual sound cavity length is effectively improved.

Description of drawings

1 is a schematic structural diagram of a speaker box provided by an embodiment of the present invention;

2 is an exploded view of a speaker box provided by an embodiment of the present utility model;

Fig. 3 is a sectional view along line A-A in Fig. 1;

FIG. 4 is a schematic structural diagram of a speaker box with a lower cover removed according to an embodiment of the present invention.

In the figure: 100, speaker box; 1, shell; 11, upper cover; 111, wall; 12, lower cover; 13, back plate; 131, powder filling hole; 2, accommodation space; 21, front cavity; 22 , back cavity; 221, the first back cavity; 222, the second back cavity; 3, the sounding unit; 4, the breathable spacer; 5, the sound-absorbing cotton.

Embodiments of the present invention

The present utility model will be described in detail below with reference to FIGS. 1 to 4 .

Referring to FIGS. 1 to 4 , an embodiment of the present invention provides a speaker box 100 , which includes a housing 1 having an accommodation space 2 , a sound-generating unit 3 and a ventilating spacer 4 accommodated in the accommodation space 2 . The sound-generating unit 3. The receiving space 2 is divided into a front cavity 21 and a rear cavity 22; the rear cavity 22 includes a first rear cavity 221 and a second rear cavity 222 air-connected through the air-permeable spacer 4, the sound-producing unit 3, the housing 1 and the air-permeable insulation The first rear cavity 221 is formed by the enclosure 4, and the second rear cavity 222 is formed by the enclosure 1 and the ventilating spacer 4; wherein, the second rear cavity 222 is filled with sound-absorbing particles (not shown in the figure), The cavity 221 is provided with a sound absorbing member for blocking airflow. In this embodiment, the sound-absorbing member is sound-absorbing cotton 5 . Specifically, the housing 1 includes an upper cover 11 , a lower cover 12 covered and fixed on the upper cover 11 , and a back plate 13 fixed on the side of the upper cover 11 away from the lower cover 12 . between the lower cover 12 and the back plate 13 . The sound-generating unit 3 is provided with a diaphragm (not shown in the figure), and the upper cover 11 and the side of the sound-generating unit 3 with the diaphragm are enclosed to form a front cavity 21 for sounding. The sounding unit 3, the lower cover 12, the upper cover 11 and the air-permeable spacer 4 are enclosed to form a first rear cavity 221, and the upper cover 11, the air-permeable spacer 4 and the back panel 13 are enclosed to form a second rear cavity 222, and the air-permeable spacer 4 and the upper cover 11 divide the rear cavity 22 into a first rear cavity 221 and a second rear cavity 222 .

The sound enters the second rear cavity 222 from the first rear cavity 221, and increases its transmission path through the sound absorbing particles located in the second rear cavity 222, which can be used to improve the audio performance of the speaker box 100, especially the low frequency acoustic performance. The sound-absorbing particles may be zeolite particles or dust. The ventilating spacer 4 communicates with the first rear cavity 221 and the second rear cavity 222, so that air can be circulated between the first rear cavity 221 and the second rear cavity 222, and the sound-absorbing particles are isolated from the second rear cavity 222 into the first rear cavity. The cavity 221 and the air-permeable spacer 4 can be made of mesh, of course, it is not limited to this, as long as the sound-absorbing particles can be isolated from entering the first rear cavity 221 and can be breathable and sound-permeable.

It should be pointed out that the air communication mentioned in the present invention means that only air can circulate between the second rear cavity 222 and the first rear cavity 221, and other substances cannot enter each other, such as sound-absorbing particles.

By filling the second rear cavity 222 with sound-absorbing particles, due to the porous structure and high specific capacity of the sound-absorbing particles, the air in the second rear cavity 222 can be absorbed and the air compliance can be improved, thereby reducing the low frequency resonance frequency of the speaker box 100 . Further, the low frequency performance is improved, so as to improve the low frequency acoustic performance, so that the second rear cavity 222 forms a D-BASS virtual sound cavity, so as to improve the low frequency acoustic performance of the speaker box 100 . When the length of the second rear cavity 222 is relatively long, the sound absorbing cotton 5 is arranged in the first rear cavity 221 to block the airflow entering the second rear cavity 222 from the first rear cavity 221 , thereby reducing the speed of the air flow. The motion of the sound-absorbing particles reduces the wear caused by the vigorous movement of the sound-absorbing particles, thereby reducing the change of the lowest resonant frequency (F0) caused by the wear of the sound-absorbing particles. acoustic performance. It can be understood that other substances can also be used to replace the sound-absorbing cotton 5, as long as it can block the airflow.

In this embodiment, the sound-absorbing cotton 5 is fixed to the air-permeable spacer 4 and extends toward the first rear cavity 221 from the air-permeable spacer 4 . The airflow entering the second rear cavity 222 from the first rear cavity 221 must pass through the breathable spacer 4 . By fixing the sound-absorbing cotton 5 to the breathable spacer 4 , the blocking effect of the sound-absorbing cotton 5 is improved.

Preferably, the length direction of the air-permeable spacer 4 is the same as the length direction of the second rear cavity 222, and at least two sound-absorbing cottons 5 are provided, and the at least two sound-absorbing cottons 5 are distributed at intervals along the length direction of the second rear cavity 222 (Fig. 1 and the X-axis in FIG. 4 is the length direction of the second rear cavity 222). When the length of the second rear cavity 222 forming the D-BASS virtual acoustic cavity is too long, a plurality of sound-absorbing cottons 5 may be arranged to block the airflow. When multiple sound-absorbing cottons 5 are provided, the distance between adjacent sound-absorbing cottons 5 is preferably 5-10 mm. Along the length direction of the second back cavity 222, the plurality of sound-absorbing cottons 5 are sequentially the first sound-absorbing cotton, the second sound-absorbing cotton, ..., the Nth sound-absorbing cotton, wherein the first sound-absorbing cotton and the Nth sound-absorbing cotton are along the second back cavity. The distance between the length direction of 222 and the casing 1 forming the second rear cavity 222 is preferably 5-10 mm.

Specifically, when the length of the second rear cavity 222 is in the range of 10-20 mm, a sound-absorbing cotton 5 may be disposed along the length direction 1/2 of the second rear cavity 222 . When the length of the second rear cavity 222 is in the range of 20-30 mm, a sound-absorbing cotton 5 may be provided at 1/3 and 2/3 of the length of the second rear cavity 222 respectively. In this embodiment, a sound-absorbing cotton 5 is arranged in the first rear cavity 221 .

Preferably, the sound-absorbing cotton 5 extends along the width direction of the air-permeable spacer 4 , and the side of the sound-absorbing cotton 5 away from the air-permeable spacer 4 abuts against the casing 1 . With this arrangement, the blocking effect of the sound-absorbing cotton 5 on the airflow is improved. In this embodiment, a sound-absorbing cotton 5 extending along the width direction of the air-permeable spacer 4 is disposed in the first rear cavity 221 , and the side of the sound-absorbing cotton 5 away from the air-permeable spacer 4 abuts against the lower cover 12 , thereby blocking the The airflow entering the second rear cavity 222 from the first rear cavity 221 slows down the movement of the sound-absorbing particles in the second rear cavity 222, thereby reducing the wear on the sound-absorbing particles, and further reducing the variation of the lowest resonant frequency (F0) by 10- 30Hz.

Please refer to FIG. 4 , the upper cover 11 is provided with a surrounding wall 111 extending in the direction of the lower cover 12 and spaced from the lower cover 12 , and the ventilation spacer 4 is fixed to the surrounding wall 111 . Through this arrangement, the space of the second rear cavity 222 is increased, the volume of the virtual sound cavity is effectively increased, and the acoustic performance of the speaker box 100 is further improved. In this embodiment, the air-permeable spacer 4 forms a fixed seal with the surrounding wall 111 by means of heat fusion.

Referring to FIG. 2 again, the speaker box 100 further includes a powder filling hole 131 disposed through the back plate 13 , and the powder filling hole 131 communicates with the second rear cavity 222 . With this arrangement, the sound-absorbing particles are poured into the second rear cavity 222 through the powder filling hole 131 , so that the second rear cavity 222 forms a D-BASS virtual sound cavity.

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. The scope of protection of the utility model.

Claims

The loudspeaker box is characterized in that it comprises a shell with a receiving space, a sound-producing unit and a ventilating spacer contained in the receiving space, and the sound-producing unit divides the receiving space into a front cavity and a rear cavity; The rear cavity includes a first rear cavity and a second rear cavity that are air-communicated through the air-permeable spacer, and the sound-producing unit, the housing and the air-permeable spacer are enclosed to form the first rear cavity, so the first rear cavity is formed. The casing and the air-permeable spacer are enclosed to form the second rear cavity; wherein, the second rear cavity is filled with sound-absorbing particles, and the first rear cavity is provided with a sound-absorbing member for blocking airflow.
The speaker box according to claim 1, wherein the sound-absorbing member is sound-absorbing cotton.
The speaker box according to claim 2, wherein the sound-absorbing cotton is fixed to the air-permeable spacer and extends from the air-permeable spacer toward the first rear cavity.
The speaker box according to claim 3, wherein the length direction of the air-permeable spacer is the same as the length direction of the second rear cavity, the number of the sound-absorbing cotton is at least two, and at least two of the The sound-absorbing cottons are distributed at intervals along the length direction of the second rear cavity.
The speaker box according to claim 3, wherein the sound-absorbing cotton extends along the width direction of the air-permeable spacer.
The speaker box according to claim 3, wherein the side of the sound-absorbing cotton away from the air-permeable spacer abuts against the casing.
The speaker box according to any one of claims 1 to 6, wherein the housing comprises an upper cover, a lower cover fixed on the upper cover, and a lower cover fixed on the upper cover away from the lower cover One side of the back plate, the breathable spacer is fixed on the upper cover and is located between the lower cover and the back plate; the upper cover and the sounding unit are enclosed to form the front cavity, so The sounding unit, the lower cover, the upper cover and the air-permeable spacer are enclosed to form the first rear cavity, and the upper cover, the air-permeable spacer and the back panel are enclosed to form the The second rear cavity; the sound-absorbing cotton abuts against the lower cover on the side away from the air-permeable spacer.
The speaker box according to claim 7, wherein the upper cover is provided with a surrounding wall extending in the direction of the lower cover and spaced from the lower cover, and the ventilation spacer is fixed to the surrounding wall .
The speaker box according to claim 7, wherein the speaker box further comprises a powder filling hole provided through the back plate, and the powder filling hole communicates with the second rear cavity.