An acoustic cavity module convenient for processing and detection

Abstract

The utility model provides a kind of sound cavity module convenient to process detection, it is related to audio frequency electronic equipment technical field, including first shell, second shell, loudspeaker unit and conducting spring piece. First shell is equipped with recessed portion passing through its side, for conducting spring piece to wear to module outside;Conducting spring piece is equipped with a inside welding portion with a outside welding portion, FPC is welded in inside welding portion, outside detection lead wire is welded in outside welding portion, to form the electrical connection path from sound cavity interior to outside. Loudspeaker unit is installed in the mounting area of first shell setting, FPC is hung on the coordination column and support column in the coordination hole set on it in loading groove. Second shell is buckled on first shell, and the support of loudspeaker unit is pressed and positioned by pressure limiting plate. The utility model structure is simple, assembly precision is high, can realize the stable welding of FPC and the convenient connection of external wire, applicable to sound cavity module automation production and detection application scene.

Description

Technical Field

[0001] This utility model relates to the field of audio electronic equipment technology, and in particular to a sound cavity module that is easy to process and test. Background Technology

[0002] Sound cavity modules are widely used in small electronic products such as portable audio devices, Bluetooth headsets, and smart terminals. As an important structural unit for sound output, they typically consist of two interlocking shells forming a sound cavity, within which a speaker unit is installed to output sound waves. The speaker unit is connected to external circuitry via a flexible printed circuit (FPC) to ensure signal input and power supply.

[0003] Existing products typically require testing before leaving the factory. This testing process involves using test terminals connected to leads from the FPC (Flexible Printed Circuit) for signal detection. In traditional designs, the FPC is often located near the edge of the housing, and leads are made out of the housing via soldering or other methods. The housing usually has a cable exit channel, from which the leads are led out, and the channel is then sealed with glue to maintain the acoustic cavity's airtightness. Each test requires inserting and removing test terminals from the lead terminals. Repeated insertion and removal can easily cause wear or deformation of the terminal structure, affecting its contact performance with external test probes or interfaces. In severe cases, this can even lead to poor contact or no sound, reducing testing efficiency. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, the technical problem to be solved by this utility model is to propose a sound cavity module that is easy to process and test, and the following technical solution is adopted:

[0005] A cavity module that is easy to manufacture and test, including

[0006] A first housing and a second housing, wherein the first housing and the second housing are fastened together to form a sound cavity;

[0007] The first housing is provided with a mounting groove, and the speaker unit is installed in the mounting groove; an FPC is fixedly provided on one side of the speaker unit; the first housing is provided with a mounting base that connects the inside and outside of the sound cavity, a conductive spring is provided in the mounting base, the FPC is fixedly connected to one side of the conductive spring, and the other side of the conductive spring extends to the outside of the sound cavity for connecting a detection terminal.

[0008] As a further improvement, the first housing is provided with a side enclosure, the inner side of which is provided with a stepped surface, and the second housing is provided with a connecting edge. When the second housing and the first housing are fastened together, the connecting edge abuts against the stepped surface.

[0009] As a further improvement, the aforementioned connecting edge and the aforementioned step surface are connected by ultrasonic welding.

[0010] As a further improvement, the first housing is provided with a support block, and the second housing is provided with a stop block that cooperates with the support block. When the first housing and the second housing are fastened together, the support block and the stop block abut against each other, providing structural support for the middle part of the sound cavity.

[0011] As a further improvement, the aforementioned conductive spring is fixed in the aforementioned mounting base by injection molding.

[0012] Further improvements include two of the aforementioned conductive springs, which are parallel and staggered.

[0013] As a further improvement, the speaker unit is provided with a support platform, which is fixed in the mounting groove. The second housing is provided with a pressure plate. When the second housing is fastened to the first housing, the pressure plate presses the support platform tightly in the mounting groove.

[0014] As a further improvement, the FPC is provided with at least one matching hole, and the mounting groove is provided with a matching post that mates with the matching hole. The matching hole is sleeved on the matching post to fix the FPC.

[0015] As a further improvement, two of the aforementioned positioning columns are provided in the aforementioned mounting groove, and a support column is provided between the two aforementioned positioning columns, the aforementioned support column being used to support the aforementioned FPC.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] Firstly, this invention features a mounting base on the first housing with a conductive spring inside. This allows the FPC connected to the speaker unit to be directly soldered to one side of the conductive spring, while the other side of the conductive spring extends to the external area of ​​the sound cavity module, forming an internal and external conductive path. This eliminates the need for additional wire slots or sealing operations, effectively reducing structural complexity and manufacturing costs. The conductive springs are parallel and staggered, allowing the test terminal leads to be directly soldered to the outside of the conductive springs during processing and testing. The staggered arrangement prevents lead obstruction and interference during soldering. This mechanism effectively avoids terminal wear caused by repeated insertion and removal of the FPC during testing, and also prevents structural failures such as FPC root detachment and sealant damage due to pulling, thus improving the stability and reliability of the testing process.

[0018] Secondly, addressing the issues of shell connection stability and acoustic cavity sealing, this invention features a stepped surface on the side of the first shell and a connecting edge on the outer periphery of the second shell. The connecting edge abuts against the stepped surface to form a sealing fit structure. Ultrasonic welding is then used for sealing, ensuring the structural strength and airtightness of the shell connection. Furthermore, the first and second shells are respectively provided with support blocks and abutment blocks, forming a positioning and abutment structure during the shell connection process. This provides support for the center of the acoustic cavity module, improving the positioning accuracy and structural stability of the module during assembly and reducing the rate of process defects such as misassembly and misalignment.

[0019] Thirdly, to achieve stable installation and effective positioning of the speaker unit and FPC, this utility model has a mounting groove in the first housing, a support platform at the bottom of the speaker unit embedded in the mounting groove, and a pressure limiting plate structure inside the second housing. When the two housings are fastened together, the pressure limiting plate presses the support platform tightly into the mounting groove, thereby preventing the speaker unit from shifting or falling off during transportation and use. The FPC is provided with matching holes that cooperate with matching posts in the mounting groove to achieve precise positioning and installation before welding, preventing misalignment or suspension that could cause poor contact. A support column structure is added between the two matching posts to provide bottom support for the FPC, improving the reliability of the electrical connection and the overall assembly consistency of the module. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the assembly structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the exploded structure of this utility model;

[0023] Figure 3 This is a schematic diagram of the internal structure of the present invention;

[0024] Figure 4 This is a schematic diagram of the assembly of the conductive spring of this utility model;

[0025] Figure 5 This is a cross-sectional view of the mounting base of this utility model;

[0026] Figure 6 This is a longitudinal sectional view of the mounting base of this utility model;

[0027] Figure 7This is a schematic diagram of the internal structure of this utility model;

[0028] Figure 8 for Figure 7 Enlarged view of point A in the middle;

[0029] Figure 9 for Figure 7 Enlarged view of point B in the middle.

[0030] Figure label:

[0031] 1-First housing; 2-Second housing; 3-Speaker unit; 4-Sound cavity; 5-Detection terminal;

[0032] 11-Mounting base; 12-Side enclosure; 13-Limiting seat; 14-Housing groove; 15-Step surface; 16-Bearing block; 17-Matching column; 18-Supporting column;

[0033] 110-Cavity; 111-Conducting spring; 111a-Connecting section; 111b-Bending section; 112-Limiting plate; 113-Overflow port; 114-Through groove; 115-Longitudinal beam; 116-Support;

[0034] 121 - Flow guide groove; 122 - Exhaust port;

[0035] 131 - Injection hole; 132 - Slot; 133 - Post;

[0036] 21-Connecting edge; 22-Abutting block; 23-Pressure limiting plate;

[0037] 31-Pre-installation hole; 32-Platform; 33-Matching hole. Detailed Implementation

[0038] To facilitate understanding by those skilled in the art, the structure of this utility model will now be described in further detail with reference to the accompanying drawings:

[0039] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. The terms "part," "side," "end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0040] like Figures 1-3As shown, this application provides a cavity module and its assembly method that are easy to process and test. The module includes a first housing 1 and a second housing 2. A side panel 12 is provided around the outer periphery of the first housing 1 to strengthen the overall support and resistance to deformation. The inner side of the side panel 12 has a stepped surface 15, and the outer edge of the second housing 2 has a connecting edge 21. During module assembly, the connecting edge 21 of the second housing 2 abuts against the stepped surface 15 of the first housing 1, forming a stable closed structure. To further enhance the connection between the first housing 1 and the second housing 2, the connecting edge 21 and the stepped surface 15 are thermally bonded using ultrasonic welding. Compared to traditional snap-fit ​​or adhesive connections, this method offers advantages such as high connection strength, good sealing, and no need for additional auxiliary materials, making it particularly suitable for cavity module applications with compact structures and high electrical performance requirements. This welding method ensures a high-strength integrated encapsulation between the housings, significantly improving the module's vibration resistance and environmental adaptability, and effectively reducing the risk of housing loosening due to transportation or long-term use.

[0041] like Figures 1-3 As shown, the first housing 1 and the second housing 2 are fastened together to form a sound cavity 4 inside. A speaker unit 3 is disposed inside the sound cavity 4, serving as the sound-generating device of the sound cavity module. The speaker unit 3 is installed within a pre-defined mounting area on the first housing 1. Specifically, a mounting groove 14 is formed on one side of the first housing 1 to accommodate and position the speaker unit 3. The speaker unit 3 is tightly fitted and installed within the mounting groove 14. A flexible circuit board (FPC) is fixedly connected to one side of the speaker unit 3 to enable communication with external electrical signals.

[0042] like Figure 3 As shown, the first housing 1 is provided with a support block 16, and the second housing 2 is provided with an abutment block 22 that mates with the support block 16. When the first housing 1 and the second housing 2 are fastened together, the support block 16 and the abutment block 22 abut against each other, forming a directional support relationship. The support block 16 is typically formed and extends along the inner side of the first housing 1, while the abutment block 22 is located on the inner wall of the second housing 2 corresponding to its mating position. The two fit together during the fastening process, forming a stable contact point and providing stable support for the middle part of the acoustic cavity module.

[0043] like Figures 2-6As shown, the first housing 1 is also provided with a mounting base 11 that spans the side circumference 12 of the first housing 1 and connects the inside and outside of the sound cavity 4. Specifically, the mounting base 11 is hollow to form a cavity 110, which also extends through and connects the inside and outside of the sound cavity 4. A conductive spring 111 is installed in the cavity 110 to realize the electrical connection between the flexible circuit board (FPC) inside the sound cavity 4 and the external wires of the module. One end of the conductive spring 111 is electrically connected to the FPC, and the other end extends to the external area of ​​the sound cavity module, which facilitates subsequent soldering or other test connections with the detection terminal 5. Through this structure, a closed electrical connection path can be realized from the inside of the sound cavity 4 to the external detection, avoiding the problem of wire loosening caused by sealant cracking or external pulling in the traditional wiring method, thus improving structural stability and processing reliability.

[0044] like Figure 4 , Figure 6 and Figure 9 As shown, the mounting base 11 is provided with an injection hole 131, which connects to the cavity 110. A limiting plate 112 is provided inside the cavity 110. The limiting plate 112 is used to support the conductive spring piece 111. The conductive spring piece 111 is placed above the limiting plate 112, so that a reserved gap is formed below it for subsequent injection material filling.

[0045] like Figure 4 As shown, the upper surface of the mounting base 11 has a through groove 114 that connects to the cavity 110. The through groove 114 is used to guide the conductive spring piece 111 into the cavity 110. Each through groove 114 is equipped with two limiting plates 112 to support the left and right sides of the conductive spring piece 111. After the conductive spring piece 111 is inserted along the through groove 114, its body is stably placed above the limiting plate 112. The insertion path is constrained by the fit between the limiting plate 112 and the through groove 114, thereby ensuring accurate insertion position.

[0046] In one specific embodiment, the conductive spring piece 111 includes a connecting section 111a and a bent section 111b disposed at the beginning and end of the connecting section 111a. The connecting section 111a is placed on the limiting plate 112. During installation, the conductive spring piece 111 extends obliquely from the outside of the side circumference 12 of the first housing 1 along the through groove 114, and the bent section 111b at the front end extends into the cavity 110. The connecting section 111a is laid flat on the limiting plate 112, wherein the connecting section 111a is provided with a first welding part and a second welding part.

[0047] It should be understood that the height of the limiting plate 112 to the upper edge of the through groove 114 should be greater than the thickness of the conductive spring 111, and the conductive spring 111 should have a certain elasticity to ensure that the conductive spring 111 can smoothly extend into the cavity 110 along the through groove 114.

[0048] Furthermore, such as Figures 4-5As shown, in one specific embodiment, the mounting base 11 is provided with two conductive spring pieces 111, and correspondingly, the upper surface of the mounting base 11 is provided with two through slots 114, such as... Figures 6-9 As shown, a longitudinal beam 115 is provided inside the cavity 110 between two through slots 114. Limiting plates 112 are provided on both the left and right sides of the cavity 110 and the left and right sides of the longitudinal beam 115, forming two pairs of limiting plates 112 corresponding to the through slots 114. Two conductive spring pieces 111 are respectively placed on the two pairs of limiting plates 112. Furthermore, the longitudinal beam 115 is provided with two legs 116, and a space for the flow of injection molding material is formed between the two legs 116.

[0049] like Figure 5 As shown, preferably, the limiting plate 112 is a pre-bent arc-shaped support piece with its free end bent downwards. The limiting plate 112 supports the conductive spring piece 111, and the middle part forms a space for injection molding material filling due to the bending, which facilitates the filling of injection molding material.

[0050] More specifically, such as Figure 4 As shown, the two conductive spring contacts 111 are arranged in parallel and staggered. This staggered arrangement helps to avoid mutual obstruction or spatial interference between the conductive spring contacts 111 during the welding process, ensuring that the welding operations of the two conductive spring contacts 111 do not affect each other. It also facilitates the separation and layout of the wire lead-out paths, improving the efficiency of electrical connection space utilization and operational convenience of the module.

[0051] like Figure 6 and Figure 8 As shown, the mounting base 11 is provided with an overflow port 113, and the side wall 12 of the first housing 1 is provided with a guide groove 121 at the overflow port 113.

[0052] In the above embodiment, the overflow port 113 is opened on the longitudinal beam 115, and the side wall 12 of the first housing 1 is provided with a guide groove 121 at the position corresponding to the overflow port 113. The lateral width of the guide groove 121 at least covers the width of the through groove 114.

[0053] During injection molding, the injection material is injected through the injection hole 131, first filling the bottom of the cavity 110. As the liquid rises, it exerts a thrust on the conductive spring 111, causing it to gradually move upward until its upper surface abuts the lower edge of the side wall 12 of the first housing 1. As injection continues, the injection material fills upward and overflows from the overflow port 113, pouring into the guide channel 121. The guide channel 121 spans the mounting base 11, that is, the gap between the injection material filling channel 114 and the side wall 12 of the first housing 1 (or understood as the gap between the conductive spring 111 and the side wall 12 of the first housing 1), forming a closed coating layer above the conductive spring 111. It should be understood that a vent 122 should be provided above the guide channel 121 so that the gas in the guide channel 121 can be discharged from the vent 122 when the injection material is poured into the guide channel 121.

[0054] By setting the injection path as described above, not only is stable filling achieved below the conductive spring 111, but the upper area is also sealed and covered simultaneously, thus achieving complete coverage of both the upper and lower sides of the conductive spring 111. This injection molding method can effectively improve the positioning stability and insulation sealing performance of the conductive spring 111 in the module, avoiding problems such as incomplete encapsulation, colloid cracking, or exposed pins that may occur in traditional glue sealing or pressing methods, and significantly enhancing the durability and environmental adaptability of the acoustic cavity module.

[0055] like Figures 7-9 As shown, the mounting base 11 has a limiting seat 13 inside the sound cavity 4. The limiting seat 13 has a slot 132, which is connected to the cavity 110 and is used to guide the insertion of the flexible circuit board (FPC). After the FPC is inserted along the slot 132, it extends to the first soldering part on the upper surface of the conductive spring 111 to complete the subsequent soldering operation.

[0056] like Figures 7-9 As shown, a post 133 is fixed inside the slot 132, and a pre-installed hole 31 is pre-set on the FPC. After the FPC is inserted into the slot 132, the pre-installed hole 31 is hung on the post 133, forming a limiting connection. This connection method can achieve rapid initial positioning of the FPC without adding additional structural components, avoiding misalignment, warping or displacement during the insertion process.

[0057] In a preferred embodiment, the column 133 is a hollow columnar structure, forming an injection hole 131. During injection molding, the injection material is injected from inside the column 133, directly connecting to the cavity 110 inside the mounting base 11, and then filling the lower area of ​​the conductive spring 111 below the limiting plate 112. It then continues to fill and overflow upwards along the injection path, ultimately covering the upper and lower sides of the conductive spring 111. This structure saves housing space, simplifies mold opening, and improves the consistency of FPC positioning and injection path control.

[0058] In one specific embodiment, the first housing 1, the mounting base 11, and the limiting base 13 are integrally injection molded.

[0059] like Figure 2 As shown, the speaker unit 3 is provided with a support platform 32, which serves as a positioning reference for installation with the first housing 1. The first housing 1 has a pre-set mounting groove 14, and the support platform 32 is installed in the mounting groove 14 and fits against its inner wall, restricting the horizontal and vertical displacement of the speaker unit 3 during module assembly and subsequent use.

[0060] like Figures 1-3 As shown, the second housing 2 is provided with a pressure plate 23, which is positioned corresponding to the support platform 32. When the second housing 2 is fastened to the first housing 1, the pressure plate 23 contacts the support platform 32 and applies vertical pressure along the installation direction, pressing the support platform 32 tightly against the bottom of the mounting groove 14, thereby achieving forced positioning and clamping fixation of the speaker unit 3. This pressure limiting method can further improve the assembly stability of the speaker unit 3 and prevent the speaker from loosening or shifting due to assembly tolerances between housings, vibration, or external impact.

[0061] like Figure 2 As shown, the aforementioned FPC is installed on one side of the speaker unit 3, and its body is provided with at least one matching hole 33. The mounting groove 14 is provided with a matching post 17 that matches the matching hole 33. The matching post 17 extends upward from the bottom of the groove to form a protrusion. After the speaker unit 3 is installed in the mounting groove 14, the matching hole 33 is fitted onto the matching post 17 to avoid poor connection or welding misalignment caused by manual placement error or material strip misalignment.

[0062] In one specific embodiment, two positioning posts 17 are provided within the mounting groove 14 to limit the FPC at two points. A support post 18 is provided between the two positioning posts 17, extending vertically from the bottom of the groove and partially fitting against the bottom surface of the FPC, to provide central support for the suspended area of ​​the FPC. The support post 18 can prevent the FPC from sagging, bending, or thermally deforming due to excessive suspension during welding or injection molding, thus helping to improve the installation stability of the FPC.

[0063] In a preferred embodiment, the injection molding material is a liquid crystal polymer (LCP), which has good flowability, dimensional stability, and high insulation properties. This allows for precise filling and complete encapsulation within complex housing cavities 110. It also possesses excellent heat resistance and chemical corrosion resistance, making it suitable for acoustic cavity module encapsulation scenarios requiring high electrical connectivity and sealing performance. The injection pressure is 90–120 MPa to ensure sufficient filling of the cavity 110 and prevent voids or incomplete encapsulation due to insufficient pressure. The injection temperature is 280–310°C to ensure good molding stability while maintaining flowability. The injection time is 2–3 seconds to balance injection efficiency and material encapsulation uniformity, preventing incomplete filling due to short injection times or heat accumulation caused by excessively long injection times.

[0064] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A sound cavity module that is easy to process and inspect, characterized in that, include A first housing (1) and a second housing (2) are fastened together to form a sound cavity (4); The first housing (1) is provided with a mounting groove (14), and the speaker unit is installed in the mounting groove (14); an FPC is fixedly provided on one side of the speaker unit (3); the first housing (1) is provided with a mounting seat (11) that connects the inner and outer sides of the sound cavity (4), and a conductive spring (111) is provided in the mounting seat (11). The FPC is fixedly connected to one side of the conductive spring (111), and the other side of the conductive spring (111) extends to the outside of the sound cavity (4) for connecting the detection terminal (5).

2. The acoustic cavity module as described in claim 1, characterized in that, The first housing (1) is surrounded by a side wall (12), and the inner side of the side wall (12) is provided with a stepped surface (15). The second housing (2) is surrounded by a connecting edge (21). When the second housing (2) is fastened to the first housing (1), the connecting edge (21) abuts against the stepped surface (15).

3. The acoustic cavity module as described in claim 2, characterized in that, The connecting edge (21) and the step surface (15) are connected by ultrasonic welding.

4. The acoustic cavity module as described in claim 2, characterized in that, The first housing (1) is provided with a support block (16), and the second housing (2) is provided with an abutment block (22) that cooperates with the support block (16). When the first housing (1) and the second housing (2) are fastened together, the support block (16) and the abutment block (22) abut against each other, providing structural support for the middle part of the sound cavity (4).

5. A cavity module that is easy to process and inspect as described in claim 1, characterized in that, The conductive spring (111) is fixed in the mounting base (11) by injection molding.

6. The acoustic cavity module as described in claim 5, characterized in that, It includes two conductive springs (111), and the two conductive springs (111) are parallel and staggered.

7. A cavity module for easy processing and testing as described in claim 1, characterized in that, The speaker unit (3) is provided with a support platform (32), which is fixed in the mounting groove (14). The second housing (2) is provided with a pressure plate (23). When the second housing (2) is fastened to the first housing (1), the pressure plate (23) presses the support platform (32) into the mounting groove (14).

8. A cavity module for easy processing and testing as described in claim 7, characterized in that, The FPC is provided with at least one matching hole (33), and the mounting groove (14) is provided with a matching post (17) that mates with the matching hole (33). The matching hole (33) is sleeved on the matching post (17) to fix the FPC.

9. A cavity module for easy processing and testing as described in claim 8, characterized in that, Two positioning columns (17) are provided in the mounting groove (14), and a support column (18) is provided between the two positioning columns (17). The support column (18) is used to support the FPC.

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