WO2021000179A1

WO2021000179A1 - Loudspeaker module

Info

Publication number: WO2021000179A1
Application number: PCT/CN2019/094079
Authority: WO
Inventors: 陈志臣; 沈凯华
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: 2019-06-30
Filing date: 2019-06-30
Publication date: 2021-01-07
Also published as: CN210351582U

Abstract

The present utility model provides a loudspeaker module, comprising an upper cover plate having an accommodation cavity, a lower cover plate and a loudspeaker unit. An upper cover plate bottom wall and a raised rib extending from the upper cover plate bottom wall towards the lower cover plate are provided in an area of the upper cover plate where no loudspeaker unit is placed. The loudspeaker module further comprises a breathable isolation piece fixed on the raised rib, and an airflow groove body is formed by the upper cover plate bottom wall, the raised rib and the breathable isolation piece together; the lower cover plate is provided with a barrier plate, and the loudspeaker module further comprises a reinforcing rib plate clamped between the barrier plate and the breathable isolation piece, and a filling cavity for accommodating a sound-absorbing material is formed by the barrier plate, a lower cover plate bottom wall and the breathable isolation piece together; the projection of the barrier plate along the assembly direction of the upper cover plate and the lower cover plate is located within the range of the airflow groove body, such that the airflow groove body is in airflow communication with the filling cavity by means of the breathable isolation piece, a side wall of the raised rib extending in the direction of the accommodation cavity is provided with a notch which facilitates the communication between the airflow groove body and the accommodation cavity.

Description

Speaker module

【 Technical Field 】

The utility model relates to the field of electro-acoustic conversion, in particular to a speaker module.

【 Background Technology 】

In a speaker device including a speaker, a housing, and a resonance space, a gas absorbing material, also known as a sound absorbing material, such as activated carbon or zeolite, can be placed therein to improve the sound production of the speaker device. The gas absorption material in the resonance space of the speaker causes a virtual enlargement of the resonance space (Virtual Enlargement) through gas absorption and release, so that the resonance frequency of the speaker device is reduced to a value that can be achieved with a larger resonance space. It is generally used for Enhance the low frequency effect of the speaker.

In general speakers, a special area is set up to place the sound-absorbing material. Research on the area where the speaker is used to place the sound-absorbing material is continuing. The usual research direction is to accommodate more sound-absorbing materials in a limited space and at the same time Taking into account the airflow compliance in the working process of the loudspeaker, how to set the space for the sound-absorbing material and how to make the airflow enter the area of the sound-absorbing material after a longer path has become a problem to be solved by the present invention.

[ Utility model content ]

The purpose of the present invention is to provide a loudspeaker module that can encapsulate more sound-absorbing materials to fully exert the performance of the sound-absorbing materials.

The technical scheme of the utility model is as follows:

The speaker module provided by this embodiment includes an upper cover plate having a receiving cavity, a lower cover plate opened opposite to the upper cover plate, and a speaker unit received in the receiving cavity and fixed to the upper cover plate. The upper cover is provided with an upper cover bottom wall and a rib extending from the upper cover bottom wall toward the lower cover in the area where the speaker unit is not placed, and the speaker module further includes The air-permeable spacer fixed to the ribs, the bottom wall of the upper cover plate, the ribs, and the air-permeable spacer are jointly enclosed to form an airflow groove body, and the lower cover plate corresponds to the position of the airflow groove body A bottom wall of a lower cover plate and a baffle extending from the bottom wall of the lower cover plate toward the upper cover plate and abutting the air-permeable isolator are provided, and the speaker module further includes a baffle clamped on the baffle and the air-permeable isolator The reinforcing ribs between the components, the baffle, the reinforcing ribs, the bottom wall of the upper cover plate, the bottom wall of the lower cover plate, and the air-permeable isolator together constitute a filling cavity containing sound-absorbing materials , The projections of the baffle and the reinforcing ribs along the assembling direction of the upper cover plate and the lower cover plate overlap and are located within the range of the airflow groove body so that the airflow groove body is between the filling cavity They are all communicated with each other through air-permeable spacers, and the convex ribs are provided with notches to facilitate the communication between the airflow groove body and the receiving cavity in the direction of the receiving cavity.

Preferably, the air-permeable spacer includes a filling part covered on the rib and a supporting part in contact with the baffle.

Preferably, the reinforcing rib plate is made of stainless steel, and the reinforcing rib plate and the baffle plate and the reinforcing rib plate and the supporting portion are all fixedly connected by double-sided tape.

Preferably, the upper cover plate includes two sets of oppositely opened long-axis side walls and two sets of short-axis side walls that are oppositely opened and connected to the two sets of long-axis side walls, the opening direction of the baffle and the complement The opening direction of the strong ribs is consistent with the opening direction of the short axis side walls, the two ends of the baffle are respectively against the inner surfaces of the two groups of the long axis side walls of the upper cover plate. The two ends of the reinforcing ribs also respectively abut against the inner surfaces of the two sets of long axis side walls of the upper cover plate.

Preferably, the speaker module further includes a flexible circuit board FPC board electrically connected to the speaker unit, one end of the FPC board is fixed in the receiving cavity, and the other end of the FPC board is from the upper cover The side wall of the short axis of the board protrudes.

Preferably, the ribs include two sets of long shaft groove walls corresponding to the long shaft side walls and a set of short shaft grooves corresponding to the short shaft side walls and connecting the two sets of long shaft side walls. The short axis groove wall and the two groups of long axis groove walls are all located in the filling cavity, and the extension ends of the two groups of long axis groove walls are in contact with the receiving cavity.

Preferably, the upper cover plate is further provided with two sets of stop posts that cooperate with the baffle to separate the receiving cavity and the filling cavity, and one ends of the two sets of stop posts are respectively fixed to the two sets of long shafts The extended end of the groove wall and the other end of the stop post are fixed on the inner surface of the side wall of the long shaft.

Preferably, the lower cover plate is provided with a powder filling hole for filling with sound-absorbing material, the powder filling hole is communicated with the filling cavity, and the speaker module further includes a powder filling hole fixed on the powder filling hole for sealing Seal the cover sheet.

Preferably, the lower cover plate is further provided with a leakage hole communicating with the filling cavity, and the hole diameter of the leakage hole is smaller than the hole diameter of the powder filling hole.

The beneficial effects of the utility model are:

The speaker module of the present invention puts the sound-absorbing material on the lower cover instead of sharing the space for placing the speaker unit, and can obtain a larger filling cavity to accommodate more sound-absorbing materials. The airflow in the receiving cavity needs to pass through the air-permeable partition and the airflow trough before entering the sound-absorbing material area, which increases the airflow path, improves the airflow compliance, and further improves the sound effect. The air-permeable spacer can pass air flow, and the sound waves generated by the speaker unit in the receiving cavity enter through the receiving slot without any obstruction. The air flow is smoother, which effectively increases the contact area between the sound-absorbing material and the sound wave, and can better play the sound absorption Material performance. The air-permeable spacer in the utility model only needs to be covered at the position where the convex rib is in contact with the filling cavity, the amount is small, the production cost can be greatly saved, and the sound absorption efficiency of the sound absorption material is increased.

【 Explanation of drawings 】

Figure 1 is a schematic structural diagram of a speaker module in an embodiment of the utility model;

2 is a schematic diagram of a three-dimensional exploded structure of the speaker module in the embodiment of the utility model;

Figure 3 is a schematic diagram of a partial structure of a speaker module in an embodiment of the utility model;

Figure 4 is a schematic diagram of the structure of the upper cover in the embodiment of the utility model;

Figure 5 is a schematic diagram of the structure of the lower cover in the embodiment of the utility model;

Figure 6 is a cross-sectional view of the speaker module in the embodiment of the utility model along the direction A-A in Figure 1;

FIG. 7 is a partial enlarged view of the components in the area B along the circle B in FIG. 6 of the speaker module in the embodiment of the present invention.

[ Specific embodiments ]

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

Please refer to Figures 1-3. This utility model discloses a speaker module, which includes an upper cover 1 with a receiving cavity 11, a lower cover 2 opened opposite to the upper cover 1, and a lower cover 2 accommodated in the receiving cavity 11 and The speaker unit 3 is fixed to the upper cover 1. The upper cover 1 is provided with an upper cover bottom wall 17 and a protrusion extending from the upper cover bottom wall 17 toward the lower cover 2 in the area where the speaker unit 3 is not placed. The rib 13, the speaker module 3 also includes a breathable spacer 5 fixed to the rib 13, the bottom wall 17 of the upper cover plate, the rib 13 and the breathable spacer 5 are jointly enclosed to form an air flow groove 135, and the lower cover 2 corresponds to the air flow The position of the tank body 135 is provided with a lower cover bottom wall 24 and a baffle 21 extending from the lower cover bottom wall 24 toward the upper cover 1 and abutting the breathable spacer 5, the baffle 21, the reinforcing rib 6, the upper The bottom wall 17 of the cover plate, the bottom wall 24 of the lower cover plate and the air-permeable spacer 5 jointly constitute a filling cavity 13 containing sound-absorbing materials. The projection of the baffle 21 and the reinforcing rib 6 along the assembly direction of the upper cover plate 1 and the lower cover plate 2 It overlaps and is located within the airflow trough body 135 so that the airflow trough body 135 and the filling cavity 13 are in airflow communication through the air-permeable spacer 5; the speaker module also includes a supplementary clamp clamped between the baffle 21 and the air-permeable spacer 5. The strong ribs 6 and the convex ribs 13 are provided with a notch 131 that facilitates the communication between the air flow groove body 135 and the receiving cavity 11 in the direction of the receiving cavity 11.

The breathable spacer 5 is a component that can breathe and play a role in isolation, specifically, it can be a dust-proof mesh, which is a dustproof and acoustic auxiliary used in mobile phones, speakers and other electronic components The material is woven by high-precision looms using polyester and polyester as raw materials. It has the characteristics of variable density, light weight, rigidity, compliance and acoustic resistance. The specific woven material can be one or two of polyethylene terephthalate PET and polyether ether ketone PEEK.

Compared with the prior art, the speaker module of the present invention places the sound-absorbing material 4 on the lower cover 2 instead of sharing the space for placing the speaker unit 3, and a larger filling cavity 13 can be obtained to accommodate more sound absorption. Material 4. The air flow in the accommodating cavity 11 needs to pass through the air-permeable partition 5 and the air flow groove body 135 before entering the area of the sound-absorbing material 4, which increases the air flow path, improves the air flow compliance, and further improves the sound effect. The air-permeable spacer 5 can flow air, the sound waves generated by the speaker unit 3 in the receiving cavity 11 enter through the notches 131 of the ribs, and the filling notches 132 of the ribs are output, which effectively increases the contact area between the sound-absorbing material 4 and the sound waves. The performance of the sound-absorbing material 4 can be better utilized. The air-permeable spacer 5 in the utility model only needs to be covered at the filling notch 132 of the convex rib, and the amount is small, which can greatly save the production cost. The sound wave is transmitted in the notch 131 of the convex rib and the filling notch 132 of the convex rib. It is more smooth under the cooperation, and the sound absorption efficiency of the sound absorption material 4 is increased. The ribs 13 and the upper cover plate 1 are an integral structure, which is easy to process and shape.

6-7, the air-permeable spacer 5 includes a filling portion 51 covering the rib 13 and a supporting portion 52 that is in contact with the baffle 21. The supporting portion 52 of the air-permeable spacer 5 is fixedly connected to the baffle 21 by double-sided tape, so that the filling cavity 12 and the receiving cavity 11 can be physically separated. The filling portion 51 is completely covered on the filling notch 132. According to different requirements, The size of the filling portion 51 of the air-permeable spacer 5 can be adjusted. Since the air-permeable spacer 5 does not need to be covered in the receiving cavity 11, and the covering in the filling cavity 12 is only used to determine the size of the air flow groove body 135, the air-permeable spacer 5 The amount of 5 used can be greatly reduced to reduce costs and simplify the process.

Reinforcing ribs 6 are provided between the baffle 21 and the supporting portion 52 of the air-permeable spacer 5 to reinforce the hardness of the contact position of the air-permeable spacer 5 and the baffle 21, which can compensate for the soft material of the air-permeable spacer 5 and improve The sealing reliability of the sound-absorbing material 4 at the connection between the breathable spacer 5 and the baffle 21 is improved, and the risk of powder leakage is reduced.

In this embodiment, the reinforcing rib 6 is made of stainless steel, and both the reinforcing rib 6 and the baffle 21 and the reinforcing rib 6 and the supporting portion 52 are fixedly connected by double-sided tape. The two sides of the reinforcing ribs 6 are respectively and seamlessly connected with the baffle 21 and the air-permeable spacer 5, so as to form a sealed whole with the air-permeable spacer 5 and play the role of strengthening the compression resistance. Of course, the present invention is not limited to the use of double-sided tape, and other methods can also be used to realize the fixation of the reinforcing rib 6.

Please further refer to Figures 4-5. The upper cover 1 includes two sets of oppositely opened long axis side walls 14 and two sets of short axis side walls 15 oppositely opened and connected to the two sets of long axis side walls 14. The opening direction of the baffle 21 And the opening direction of the reinforcing ribs 6 is consistent with the opening direction of the short axis side walls 15. The two ends of the baffle plate 21 respectively abut the inner surfaces of the two groups of long axis side walls 14 of the upper cover plate 1, and the reinforcing ribs The two ends of the plate 6 also respectively abut against the inner surfaces of the two sets of long axis side walls 14 of the upper cover plate 1. The baffle 21 and the lower cover 2 are an integral structure, which is easy to process. The opening direction of the baffle 21 and the opening direction of the reinforcing rib 6 are consistent with the opening direction of the short axis side wall 15. The use length of the stiffener plate 6 is the shortest, which can maximize the space of the isolated filling cavity 12. The baffle 21 and the two ends of the stiffener plate 6 are respectively against the long axis side walls 14 of the upper cover plate 1 to achieve Better sealing effect, avoid powder leakage.

In this embodiment, the speaker module further includes a flexible circuit board FPC board 7 electrically connected to the speaker unit 3, one end of the FPC board 7 is fixed in the receiving cavity 11, and the other end of the FPC board 7 is short from the upper cover 1 The shaft side wall 15 protrudes. The FPC board 7 is mainly electrically connected with the speaker unit 3, and realizes the sound production process of the speaker unit 3 through electric signals.

In this embodiment, the rib 13 includes two sets of long shaft groove walls 131 corresponding to the long shaft side walls 14 and a set of short shaft grooves corresponding to the short shaft side walls 15 and connecting the two sets of long shaft side walls 14 The wall 132, the short axis groove wall 132 and the two groups of long axis groove walls 131 are all located in the filling cavity 12, and the extended ends of the two groups of long axis groove walls 131 are in contact with the receiving cavity 11. The rib 13 is a structure that seals the opening on both sides on four sides. The two sets of long shaft groove walls 133 and one set of short shaft groove walls 134 are enclosed to form a filling notch 132. The two sets of long shaft groove walls 133, the upper cover plate 1 and the ventilation One end of the spacer 5 is enclosed to form a receiving notch 131, and the receiving notch 131 and the filling notch 132 are perpendicular to each other, so that a good ventilation effect can be achieved and the occupied area of the rib 13 can be minimized.

In this embodiment, the upper cover 1 is also provided with two sets of stop posts 16 that cooperate with the baffle 21 to separate the receiving cavity 11 and the filling cavity 12, and one end of the two sets of stop posts 16 are respectively fixed on the two sets of long axis groove walls 133. The other end of the stop post 16 is fixed on the inner surface of the side wall 14 of the long axis. The arrangement of the stop post can not only fill the gap formed between the rib 13 and the side wall 14 of the long axis, but also bear the pressure of the baffle 21 at both ends, reduce the force of the breathable spacer 5, and achieve the auxiliary breathable spacer 5. Support the role of the baffle 21.

In this embodiment, the lower cover 2 is provided with a powder filling hole 22 that is convenient for filling the sound-absorbing material 4, the powder filling hole 22 communicates with the filling cavity 12, and the speaker module also includes a seal fixed on the powder filling hole 22 for sealing. Cover piece 8. The lower cover plate 2 is also provided with a leakage hole 23 communicating with the filling cavity 12, and the hole diameter of the leakage hole 23 is smaller than the hole diameter of the powder filling hole 22. The powder filling hole 22 is mainly used to fill the sound-absorbing material 4. A cover sheet is used on the leakage hole 23 to avoid powder leakage, and at the same time to ensure the circulation of air flow, so the hole diameter of the leakage hole 23 is smaller than the hole diameter of the powder filling hole 22.

Further referring to Fig. 6, the assembly direction of the speaker module of the present invention is pointed by arrow X in Fig. 6, the upper cover 1 is fixed, the speaker unit 3 is first fixed in the X direction, and then the net is fixed on the rib 13 in the X direction Then, cover the lower cover plate 2 in the X direction, and finally pour the sound-absorbing material 4 in the X direction through the powder filling hole 221.

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

Claims

A speaker module includes an upper cover plate having a receiving cavity, a lower cover plate opened opposite to the upper cover plate, and a speaker unit accommodated in the receiving cavity and fixed to the upper cover plate, characterized in that The upper cover is provided with a bottom wall of the upper cover and a rib extending from the bottom wall of the upper cover toward the lower cover in the area where the speaker unit is not placed, and the speaker module further includes a fixing In the air-permeable spacer of the ribs, the bottom wall of the upper cover plate, the ribs, and the air-permeable spacer are jointly surrounded to form an air flow groove body, and the lower cover plate is provided at a position corresponding to the air flow groove body There is a bottom wall of a lower cover plate and a baffle extending from the bottom wall of the lower cover plate toward the upper cover plate and abutting against the air-permeable spacer. The speaker module further includes a baffle clamped on the baffle and the air-permeable spacer The baffle plate, the reinforcing rib plate, the bottom wall of the upper cover plate, the bottom wall of the lower cover plate, and the air-permeable spacer jointly constitute a filling cavity containing sound-absorbing materials, The projections of the baffle and the reinforcing ribs along the assembly direction of the upper cover plate and the lower cover plate overlap and are located in the range of the airflow groove body so that the airflow groove body and the filling cavity They are all communicated with each other by air-permeable spacers, and the convex ribs are provided with notches to facilitate the communication between the airflow groove body and the receiving cavity in the direction of the receiving cavity.
The speaker module according to claim 1, wherein the upper cover plate comprises two sets of long-axis side walls oppositely opened and two sets of short-axis side walls that are oppositely opened and connected to the two sets of long-axis side walls , The opening direction of the baffle plate and the opening direction of the reinforcing rib plate are consistent with the opening direction of the side wall of the short axis, and the two ends of the baffle plate respectively abut against the two groups of the upper cover plate On the inner surface of the long axis side wall, the two ends of the reinforcing rib plate also respectively abut against the inner surfaces of the two groups of the long axis side walls of the upper cover plate.
The speaker module according to claim 2, wherein the speaker module further comprises a flexible circuit board (FPC board) electrically connected to the speaker unit, one end of the FPC board is fixed in the receiving cavity, The other end of the FPC board protrudes from the side wall of the short axis of the upper cover board.
The speaker module according to claim 2, wherein the ribs comprise two groups of long axis groove walls corresponding to the long axis side walls and a group of corresponding and connected to the short axis side walls The short axis groove walls of the two groups of the long axis side walls, the short axis groove walls and the two groups of the long axis groove walls are all located in the filling cavity, and the extension ends of the two groups of the long axis groove walls and The receiving cavity is in contact with each other.
The speaker module according to claim 4, wherein the upper cover plate is further provided with two sets of barrier posts that cooperate with the baffle to separate the receiving cavity and the filling cavity, and the two sets of barriers One end of the column is respectively fixed on the extension ends of the two groups of the long shaft groove walls, and the other end of the stop column is fixed on the inner surface of the side wall of the long shaft.
The speaker module according to claim 1, wherein the air-permeable spacer includes a filling part covering the rib and a supporting part contacting the baffle.
The speaker module according to claim 6, wherein the reinforcing rib is made of stainless steel, between the reinforcing rib and the baffle, and between the reinforcing rib and the supporting portion Both are fixedly connected by double-sided tape.
The speaker module according to claim 1, wherein the lower cover plate is provided with a powder filling hole for filling with sound-absorbing material, the powder filling hole communicates with the filling cavity, and the speaker module is also It includes a sealing cover sheet fixed on the powder filling hole for sealing.
8. The speaker module according to claim 8, wherein the lower cover plate is further provided with a leakage hole communicating with the filling cavity, and the hole diameter of the leakage hole is smaller than the hole diameter of the powder filling hole.