A loudspeaker module with a bridge and a manufacturing method thereof

Abstract

The application discloses a loudspeaker module with a bridge piece and a manufacturing method thereof, which comprises an upper shell and a bottom shell, the upper shell and the bottom shell are combined to form an assembly cavity matched with a sound generator, and an FPC piece matched with the sound generator is further arranged on the bottom shell, an inner connecting piece is fixedly arranged at an extension end of the FPC piece in the bottom shell, a bridge piece is fixedly arranged between the inner connecting piece and an external circuit in the bottom shell, one end of the bridge piece is connected with the inner connecting piece through an electrical connection structure, and the other end of the bridge piece extends to the outside of the bottom shell to form an external connecting part matched with the external circuit, the bridge piece is injected in the inside of the loudspeaker module shell, the FPC piece is bridged with the external circuit through the bridge piece, three problems of structure fixation, electrical penetration and penetration port sealing are solved at one time, process defects, slot glue defects (broken glue and overflow glue) can be effectively reduced, and the risk of FPC warping and air leakage can be avoided through the injected bridge piece.

Description

Technical Field

[0001] This invention relates to the field of loudspeaker module processing technology, and in particular to a loudspeaker module with bridging plates and its manufacturing method. Background Technology

[0002] In loudspeakers, the role of FPC (flexible printed circuit board) is to connect the speaker's driver section to external circuitry. In the design of ultra-thin loudspeakers, to save internal space or optimize wiring, designers place the PADs (pads or contact points for electrical connections) on the front of the BOX (loudspeaker housing). The advantage is that it avoids adding connection structures in the thickness direction of the device and facilitates direct soldering or contact connection from the front. However, the disadvantage is that when the PADs are located on the front of the BOX, the structural design becomes more complex. This is mainly reflected in the fact that in order to achieve reliable electrical connections in an extremely compact space, a combination of front-mounted pads, flexible connections, and highly integrated structures must be adopted. In order to adapt to the compact internal space layout of the loudspeaker while ensuring the integrity of the circuit connection, the FPC is bent multiple times inside the loudspeaker before exiting. At the points where the FPC bends and protrudes, a sealing method using adhesive is employed. This is primarily to prevent external water, dust, or moisture from intruding into the speaker's interior, protecting the FPC from damage, and thus ensuring the speaker's stable performance and lifespan. Patent document CN213880237U discloses a speaker module that uses a combinable first circuit board (i.e., an FPC board) and an external second circuit board. The advantage is that the FPC's perforation from inside the housing to the outside is less constrained by space limitations and eliminates the risk of open circuits during FPC bending. However, the drawback of this solution is that although the risk of open circuits at the FPC bending points is reduced, the FPC still needs to undergo multiple bends within the housing to extend the solder pads to the connection point with the external second circuit board to complete the connection with the external circuitry. This results in higher resistance and a higher risk of mechanical breakage at the FPC bending points during speaker operation (i.e., the FPC may warp and leak due to stress rebound or adhesive failure), thereby affecting speaker performance. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the technical problem to be solved by the present invention is to propose a speaker module with a bridging plate and its manufacturing method. By installing a bridging plate inside the plastic shell between the FPC and the external circuit, the connection is made to reduce the multiple bending of the FPC inside the plastic shell and avoid the high resistance and mechanical breakage risk at the bending point of the FPC during sound production.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] This invention provides a speaker module with a bridging plate, comprising an upper shell and a lower shell. The upper shell and the lower shell are combined to form an assembly cavity that mates with a sound-emitting element. The lower shell is further provided with an FPC sheet that mates with the sound-emitting element. An inner connector is fixed to the extended end of the FPC sheet within the lower shell. A bridging plate is fixed between the inner connector and an external circuit within the lower shell. One end of the bridging plate is connected to the inner connector via an electrical connection structure, and the other end extends outside the lower shell to form an external connection portion that mates with the external circuit. The bridging plate has a plurality of arched structures between the inner connector and the external connection portion, and the height of the arched structures on the plurality of bridging plates decreases from the middle to both ends.

[0006] The bottom shell is also provided with two positioning posts that cooperate with the FPC sheet, and the positioning posts pass through the FPC sheet.

[0007] The arched structure is one of C-shape, U-shape or Z-shape, the bridging piece is made of rigid material, and the bridging piece is fixed in the bottom shell by injection molding.

[0008] The sound-generating body includes a sound-generating unit and a magnetic circuit unit that drives the sound-generating unit to produce sound. The FPC sheet is connected to the voice coil of the sound-generating unit.

[0009] Based on the above solution, in order to further improve the stability and reliability of the connection between the bridging piece and the FPC piece (i.e., the electrical contact or connection point), the electrical connection structure includes a plurality of electrical contact springs arranged linearly between the inner piece and the bridging piece. Each electrical contact spring is arc-shaped, with an adhesive block fixed at one end and a fine-tuning block fixed at the other end. The inner piece, near the bridging piece, has an adhesive groove along its length that mates with the adhesive block and a micro-sliding groove that mates with the fine-tuning block. The length of the micro-sliding groove is greater than the length of the fine-tuning block, and the edges of the micro-sliding groove and the fine-tuning block are stepped. The bridging piece has an electrical contact groove at its mating end with the inner piece, and the bottom of the electrical contact spring mates with the bottom plane of the electrical contact groove. The flat bottom, after assembly, the adhesive block is bonded and fixed to the adhesive groove, the fine-tuning block is slidably connected to the micro-sliding groove, and the bottom of the electrical contact spring abuts against the bottom of the electrical contact groove. The electrical contact spring is in a pressed state, thus allowing the connection of the bridging piece and the FPC piece. To ensure the electrical contact spring has an initial pressure, maintaining stable contact even with slight deformation, the bottom shell is also fixed with a pressure adjusting post that mates with the inner contact piece. The inner contact piece has a pressure adjusting hole that mates with the pressure adjusting post. The inner contact piece is a rigid piece, and the pressure adjusting post is also provided with a pressure adjusting ring to press the inner contact piece along the pressure adjusting post toward the bridging piece. The inner contact piece is also provided with a connection contact that mates with the adhesive groove, and the FPC piece is electrically connected to the bridging piece through the electrical contact spring.

[0010] Based on the above, a method for manufacturing a speaker module with a bridging plate is also included, for manufacturing a speaker module with a bridging plate as described above, comprising the following steps:

[0011] S00: Prefabricated bridging pieces and FPC pieces. The bridging pieces are made from materials with good conductivity, elasticity, and a certain rigidity, and are precision stamped to create an arched structure. The FPC piece has pre-reserved pads or contacts for connection with the voice coil, and the other end extends to form an inner contact piece connected to the bridging piece, and electrical contact springs are assembled. The steps for assembling the electrical contact springs on the inner contact piece are as follows: the inner contact piece is fixed on a fixture, and the adhesive block of the electrical contact spring is glued and fixed into the adhesive groove of the inner contact piece; the fine-tuning block of the electrical contact spring is engaged in a micro-sliding groove to ensure that the fine-tuning block and the micro-sliding groove are slidably connected.

[0012] S10: Injection molding of the upper shell and the lower shell, using the pre-made bridging piece as an insert, precisely placing it into the designated position of the lower shell mold, and after injecting material into the lower shell mold, fixing the bridging piece inside the lower shell body, with the outer part of the bridging piece extending out of the lower shell.

[0013] S20: Internal assembly of the speaker module, the FPC piece is installed at a predetermined position on the bottom shell, the voltage adjustment hole on the inner piece is fitted into the voltage adjustment post of the bottom shell, and the voltage adjustment ring is pressed into the voltage adjustment post to press the inner piece along the axial direction of the voltage adjustment post toward the bridge piece, so that the inner piece and the bridge piece are connected by the electrical contact spring.

[0014] S30: Install the sound generator into the assembly cavity of the bottom shell, connect the voice coil of the sound generator to the FPC sheet, and fasten the upper shell to the bottom shell that has been internally assembled to form a complete assembly cavity.

[0015] As another method of assembling the bridge plate and speaker module housing, a speaker module with a bridge plate is also included, comprising an upper shell and a lower shell. The upper shell and the lower shell, when combined, form an assembly cavity that mates with a sound-emitting element. The lower shell also has an FPC piece that mates with the sound-emitting element. An inner connector is fixed to the extended end of the FPC piece within the lower shell. A bridge plate is fixed within the lower shell between the inner connector and an external circuit. A bridge groove is formed on the lower shell that mates with the bridge plate. The bridging piece is inserted into the bridging groove. One end of the bridging piece is connected to the inner piece via an electrical connection structure, and the other end extends to the outside of the bottom shell to form an external connection part that cooperates with an external circuit. The bridging piece has a plurality of arched structures between the inner piece and the external connection part. The height of the arched structures on the bridging piece decreases from the middle to both ends. The bridging piece also includes a bridging block that cooperates with the bridging groove. After the bridging piece is inserted into the bridging groove, the bridging block is fixed to the bottom shell to fix the bridging piece in the bridging groove.

[0016] The beneficial effects of this invention are as follows:

[0017] (1) In this case, a bridging piece is injected into the inside of the speaker module housing. The FPC piece is bridged with the external circuit through the bridging piece and then connected to conduction. That is, the FPC is responsible for the internal static connection of the sound source, and the bridging piece is responsible for the external dynamic connection and mechanical protection. In this way, the three problems of structural fixation, electrical penetration and penetration sealing are solved at one time. It can effectively reduce the situation of poor process and poor groove glue (glue breakage, glue overflow). The risk of FPC warping and air leakage can be avoided by the injection-molded bridging piece.

[0018] (2) In addition to welding, this invention also provides an elastic contact connection method instead of welding at the electrical connection between the FPC sheet and the bridging sheet. The circuit connection between the FPC sheet and the bridging sheet is made elastically by the electrical contact spring of the electrical connection structure. At the same time, the voltage regulating structure composed of the voltage regulating column and the voltage regulating ring is used to achieve a micro-movement, stress-resistant and highly reliable electrical connection at the electrical connection between the FPC sheet and the bridging sheet, which solves the problems of solder joint fatigue and thermal stress in the welding method. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a speaker module with a bridging plate provided in a specific embodiment of the present invention;

[0020] Figure 2 This is an assembly diagram of a speaker module (injection molded) with a bridging plate provided in a specific embodiment of the present invention;

[0021] Figure 3 This is an exploded view of a speaker module (injection molded) with a bridging plate provided in a specific embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the FPC sheet and the bridging sheet connected by an electrical connection structure in a specific embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram from another perspective of the structure when the FPC sheet and the bridging sheet are connected by an electrical connection structure in a specific embodiment of the present invention;

[0024] Figure 6 yes Figure 5 Enlarged diagram of A in the middle;

[0025] Figure 7 This is an assembly diagram of a speaker module (assembly type) with a bridging plate provided in a specific embodiment of the present invention;

[0026] Figure 8 This is an exploded view of a speaker module (assembled type) with bridging plates provided in a specific embodiment of the present invention.

[0027] In the picture:

[0028] 1. Upper shell; 11. Assembly cavity;

[0029] 2. Bottom shell; 21. Pressure regulating column; 211. Pressure regulating ring; 22. Positioning column; 23. Bridging groove; 24. Bridging block;

[0030] 3. Sound-producing body;

[0031] 4. FPC sheet; 41. Inner connector; 411. Adhesive groove; 412. Micro-slide groove; 413. Pressure regulating hole; 414. Connecting contact point;

[0032] 5. Bridging plate; 51. External connection part; 52. Arched structure; 53. Electrical connection groove;

[0033] 6. Electrical connection structure; 61. Electrical connection spring; 611. Adhesive block; 612. Fine-tuning block. Detailed Implementation

[0034] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0035] To address the issue that the FPC in a miniature panel loudspeaker requires multiple bends within the plastic shell to connect the solder pads to external circuitry, resulting in higher resistance and a risk of mechanical breakage at the bends during speaker operation (i.e., the FPC may warp and leak due to stress rebound or adhesive failure), thus affecting speaker performance, the core of this invention lies in decoupling and dividing the "internal connection" and "external penetration" functions, which are independently performed by a single FPC in existing loudspeaker designs. This allows the FPC to handle only the connection from the voice coil to a single fixed contact point inside the module, resulting in a shorter and more optimized path that avoids the most vulnerable penetrating bending area. Furthermore, a rigid metal bridging plate pre-embedded in the loudspeaker housing, with one end connected to the FPC and the other extending directly out of the loudspeaker housing as an external connection point to the external circuitry, effectively handles all penetrating structures and external mechanical connections. This provides a loudspeaker module with a bridging plate and its manufacturing method.

[0036] Example 1: A loudspeaker module with a bridging plate includes an upper shell 1 and a bottom shell 2. The upper shell 1 and bottom shell 2, when combined, form an assembly cavity 11 that mates with a sound-emitting element 3, thus forming the basic structure of the entire loudspeaker module. The bottom shell 2 also has an FPC plate 4 that mates with the sound-emitting element 3. Specifically, the sound-emitting element 3 includes a sound-emitting unit and a magnetic circuit unit that drives the sound-emitting unit to produce sound. The FPC plate 4 is connected to the voice coil of the sound-emitting unit. Furthermore, two additional FPC plates mate with the FPC plate 4 are also fixedly mounted side-by-side on the bottom shell 2. Positioning post 22 passes through the FPC sheet 4, allowing for more precise installation and fixation of the FPC sheet 4 onto the base shell 2. To facilitate the connection between the FPC sheet 4 and the external circuitry, an inner connector 41 is fixed to the extended end of the FPC sheet 4 within the base shell 2. A bridging piece 5 is fixed between the inner connector 41 and the external circuitry within the base shell 2. One end of the bridging piece 5 is connected to the inner connector 41 via an electrical connection structure 6 (using soldering or contacts), while the other end extends outside the base shell 2 to form an external connection portion 5 that mates with the external circuitry. 1. Preferably, the bridging piece 5 is made of rigid material and is fixed to the bottom shell 2 by injection molding. Thus, the extended end of the FPC piece 4 terminates at the rigid inner connector 41 within the speaker module. The bridging piece 5 can then extend through the shell to form an outer connector 51, enabling connection to external circuitry. This eliminates the need for the FPC piece 4 to bend and extend, eliminating its weakest bending point and significantly improving the electrical path stability and reliability of the FPC. Furthermore, it extends beyond the bottom shell 2. The bridging piece 5 is a rigid bridging piece, which does not have the "warping" problem caused by stress rebound of flexible materials. The bridging piece 5 and the shell of the bottom shell 2 are integrally molded by injection molding. Compared with the traditional FPC glue sealing, its seal has higher strength and reliability. Furthermore, the bridging piece 5 has a number of arched structures 52 between the inner connecting piece 41 and the outer connecting part 51. Preferably, the arched structure 52 is one of C-shaped, U-shaped or Z-shaped. The height of the arched structure 52 on the bridging piece 5 decreases from the middle to both ends.This bridging piece 5 not only serves as a circuit connection, but its gradient arched structure 52, which matches the speaker structure, effectively absorbs external vibrations and impacts transmitted to the module, preventing stress from being directly transmitted to internal solder joints or electrical contacts. When the speaker module receives external loads (including external pressure, impact, bending, or vibration), the arched structure 52 can withstand slight, coordinated elastic deformation, significantly attenuating vibrations and impacts transmitted from external devices (such as mobile phone motherboards and speaker housings) to the precision sound-producing units and electrical contacts inside the speaker. This achieves multi-dimensional stress buffering and energy absorption. Considering the speaker's structure and height variations, the gradient design allows the highest arch in the middle to provide the main deformation travel and buffering capacity, while the gradually decreasing arches on both sides achieve a smooth stiffness transition with the fixed areas at both ends (the edges of the speaker module's housing). It can also accommodate thermal expansion, preventing connection point detachment or excessive pressure due to thermal stress, which is particularly important in compact electronic devices such as miniature panel speakers.

[0037] Example 2: Based on Example 1, the bridging piece 5 and the inner piece 41 in this example are elastically connected. The electrical connection structure 6 includes several electrical contact springs 61 arranged linearly between the inner piece 41 and the bridging piece 5. The electrical contact springs 61 are arc-shaped, which allows them to undergo slight deformation. During assembly, only the distance between the inner piece 41 and the bridging piece 5 needs to be adjusted to put the electrical contact springs 61 in a pressed (or compressed) state. In this way, the inner piece 41 and the bridging piece 5 undergo different thermal expansions due to temperature changes. During expansion, the pressure can be kept stable, ensuring that the inner connector 41 and the bridging connector 5 are always connected, thus minimizing the impact of thermal stress. Based on this, two issues need to be considered: first, the electrical contact spring 61 will inevitably undergo slight deformation under pressure (especially during assembly and when thermal stress changes), requiring the electrical contact spring 61 to have a certain degree of deformation self-adjustment function; second, an initial pressing state needs to be applied so that the electrical contact spring 61 can stably function as a circuit connection between the inner connector 41 and the bridging connector 5; therefore:

[0038] (1) Regarding question one: One end of the electrical contact spring 61 is fixed with an adhesive block 611, and the other end is fixed with a fine-tuning block 612. The inner contact piece 41 is provided with an adhesive groove 411 that mates with the adhesive block 611 and a micro-sliding groove 412 that mates with the fine-tuning block 612 along the length direction of the electrical contact spring 61 near the bridging piece 5. The length of the micro-sliding groove 412 is greater than the length of the fine-tuning block 612, and the edges of the micro-sliding groove 412 and the fine-tuning block 612 are stepped. The bridging piece 5 One end of the inner connector 41 has an electrical contact groove 53 that mates with the electrical contact spring 61. The bottom of the electrical contact spring 61 is a flat bottom that mates with the bottom plane of the electrical contact groove 53 (to ensure the contact area during circuit connection and to ensure the stability of the circuit connection). After assembly, the adhesive block 611 is bonded and fixed to the adhesive groove 411, and the fine-tuning block 612 is slidably connected to the micro-sliding groove 412. The bottom of the electrical contact spring 61 abuts against the bottom of the electrical contact groove 53, and the electrical contact spring 61 is in a position where... In the pressed state, one end of the adhesive block 611 of the electrical contact spring 61 is bonded to the adhesive groove 411 and fixed to the inner contact piece 41. One end of the fine adjustment block 612 of the electrical contact spring 61 is inserted into the micro-sliding groove 412 and slidably connected to the inner contact piece 41. When the pressure on the electrical contact spring 61 increases (the gap between the inner contact piece 41 and the bridging piece 5 decreases), the fine adjustment block 612 will slide into the micro-sliding groove 412. When the pressure on the electrical contact spring 61 decreases (the gap between the inner contact piece 41 and the bridging piece 5 increases), the fine adjustment block 612 will slide out of the micro-sliding groove 412. This gives the electrical contact spring 61 a certain deformation self-adjustment function under different pressures. It can not only cope with the risks brought by thermal stress (the fine adjustment block 612 can slide slightly in the micro-sliding groove 412 to release stress), but also has a good buffering capacity against external impacts and vibrations, making the electrical contacts of the circuit stable and reliable.

[0039] (2) Regarding question two: The bottom shell 2 is also fixed with a pressure regulating post 21 that cooperates with the inner connecting piece 41. The inner connecting piece 41 is provided with a pressure regulating hole 413 that cooperates with the pressure regulating post 21. The inner connecting piece 41 is a rigid piece. The pressure regulating post 21 is also provided with a pressure regulating ring 211 to press the inner connecting piece 41 along the pressure regulating post 21 toward the bridging piece 5. The inner connecting piece 41 is also provided with a connecting contact 414 that cooperates with the adhesive groove 411. The FPC piece 4 passes through the connecting contact 414 on the inner connecting piece 41. 4. The adhesive block 611, which is further connected to the electrical contact spring 61 via the adhesive groove 411, allows the FPC sheet 4 to be electrically connected to the bridge piece 5 via the electrical contact spring 61, and ultimately connected to the external circuit. Thus, initially, the voltage regulating column 21 ensures the accuracy of the inner contact piece 41 during assembly, and the voltage regulating ring 211 provides adjustable and continuous positive pressure, ensuring stable contact between the electrical contact spring 61 and the bottom surface of the electrical contact groove 53, resisting transients that may be caused by external vibrations. Preferably, the pressure regulating ring 211 is a retaining ring or a boss formed by heat fusion to limit the position of the inner contact piece 41 on the pressure regulating column 21. Alternatively, the pressure regulating column 21 and the pressure regulating ring 211 can be configured with a threaded fit. This allows for flexible adjustment of the contact pressure between the electrical contact spring 61 and the bottom of the electrical contact groove 53. This pressure forces the flat bottom of all electrical contact springs 61 to make tight contact with the bottom of the electrical contact groove 53 of the bridging piece 5, forming a stable electrical connection. At the same time, the connection contact 414 provided on the inner contact piece cooperates with the bridging piece 5, enabling a stable circuit loop to be formed between the FPC piece 4, the bridging piece 5, and the external circuit. In the above pressure regulating scheme, since the inner contact piece 41 is small in size, one pressure regulating column 21 can achieve the desired effect. However, to ensure the stability and reliability of the installation and pressure adjustment process, the pressure regulating column 21 can be set as two parallel columns along the length of the electrical contact spring 61 to maintain the balance of the inner contact piece 41 during pressure regulation.

[0040] In summary, the solution presented in this example is more suitable for applications requiring high stability and reliability (such as high-end smartphones, tablets, and TWS earphones) or where the devices are exposed to high vibration and wide temperature ranges.

[0041] Example 3: A method for manufacturing a loudspeaker module with bridging steel plates, used to manufacture a loudspeaker module with bridging steel plates as described in the above example, comprising the following steps:

[0042] S00: Prefabricated bridging piece 5 and FPC piece 4. The bridging piece 5 is made of a material with good conductivity, elasticity and certain rigidity, such as phosphor bronze, beryllium copper or stainless steel, and an arched structure 52 is made on the bridging piece 5 by precision stamping; the FPC piece 4 is reserved with solder pads or contacts for connection with the voice coil, and the other end extends to form an inner contact piece 41 connected with the bridging piece 5, and the electrical contact spring 61 is assembled; preferably, the step of assembling the electrical contact spring 61 on the inner contact piece 41 is as follows: the inner contact piece 41 is fixed on the fixture, and the adhesive block 611 of the electrical contact spring 61 is pasted and fixed into the adhesive groove 411 of the inner contact piece 41; the fine adjustment block 612 of the electrical contact spring 61 is inserted into the micro sliding groove 412 to ensure that the fine adjustment block 612 and the micro sliding groove 412 are slidably connected; furthermore, the FPC piece 4 also needs to be machined with positioning holes that cooperate with the positioning post 22 on the bottom shell 2 to facilitate subsequent assembly;

[0043] S10: Inject the upper shell 1 and the lower shell 2. Use the pre-made bridging piece 5 as an insert and accurately place it in the designated position of the mold of the lower shell 2. It is important to note that the pre-made bridging piece 5 needs to be fixed inside the mold of the lower shell 2. At the same time, it is necessary to ensure that the position and angle of the electrical contact groove 53 and the outer part 51 of the bridging piece 5 are accurate to prevent the injection molding process from affecting it. Then, after injecting the material into the mold of the lower shell 2, the bridging piece 5 is fixedly embedded inside the body of the lower shell 2. The outer part 51 of the bridging piece 5 will extend out of the lower shell 2. During the injection molding process, it is necessary to control the injection temperature, pressure and holding time to prevent uneven shrinkage of the melt from causing the bridging piece 5 to shift or deform. Ensure that there is no gap at the junction of the bridging piece 5 and the melt to achieve a structural sealing effect. Then, open the mold and take out the integrated lower shell 2 with the bridging piece 5. Finally, trim the flash and check whether the bridging piece is loose, whether the plastic seal is intact, and whether the outer part is clean and free of contamination.

[0044] S20: Internal assembly of the speaker module. Install the FPC piece 4 into the predetermined position on the bottom shell 2. Specifically, align the positioning hole on the FPC piece 4 with the positioning post 22 on the bottom shell 2, insert it and place it in place. At this time, the inner connector 41 on the FPC piece 4 should be located in the corresponding area inside the bottom shell 2, and the electrical contact spring 61 on it is facing the electrical contact groove 53 on the bridge piece 5. The voltage adjustment hole 413 on the inner connector 41 is fitted into the voltage adjustment post 21 of the bottom shell 2. The voltage adjustment ring 211 is pressed into the voltage adjustment post 21 to press the inner connector 41 along the axial direction of the voltage adjustment post 21 towards the bridge piece 5, so that the inner connector 41 and the bridge piece 5 are connected by the electrical contact spring 61.

[0045] S30: Install the sound generator 3 into the assembly cavity 11 of the bottom shell 2, and connect the voice coil of the sound generator 3 to the FPC sheet 4. Specifically, install the sound generator 3 (including the voice coil) into the assembly cavity 11 of the bottom shell 2. Then, solder or connect the other end of the FPC sheet (the voice coil lead end) to the voice coil with conductive glue. It should be noted that this step also requires circuit connection and related functional tests. Then, snap the upper shell 1 to the bottom shell 2, which has been internally assembled, to form a complete assembly cavity 11. This completes the encapsulation of the sound generator 3.

[0046] Example 4: Unlike the above examples where the bridging piece 5 was molded by injection molding inside the speaker housing, this example involves a speaker module with a bridging steel sheet. The bridging piece 5 and the bottom shell 2 are not integrally injection molded, but rather assembled using a detachable method. Specifically, a precision groove is designed on the bottom shell 2 to press the bridging piece 5 in, and then a pressure block is used to stabilize the bridging piece 5. Sealant is applied at the joint. Specifically, it includes an upper shell 1 and a bottom shell 2. The upper shell 1 and bottom shell 2, when combined, form an assembly cavity 11 that mates with the sound-emitting body 3. The bottom shell 2 also has an FPC sheet 4 that mates with the sound-emitting body 3. An inner connector 41 is fixed to the extended end of the FPC sheet 4 inside the bottom shell 2. A bridging piece 5 is fixed between the inner connector 41 and the external circuitry inside the bottom shell 2. A bridging groove 23 is formed on the bottom shell 2 to mate with the bridging piece 5. The bridging piece 5 is embedded in the bridging groove 23. One end of the bridging piece 5 is connected to the inner connector 41 via an electrical connection structure 6. The inner connector 41 is connected to the outer shell 2, and the other end extends to form an outer part 51 that cooperates with the external circuit. The bridging piece 5 has several arched structures 52 between the inner connector 41 and the outer part 51. The height of the arched structures 52 on the bridging piece 5 decreases from the middle to both ends. It also includes a bridging block 24 that cooperates with the bridging groove 23. After the bridging piece 5 is embedded in the bridging groove 23, the bridging block 24 is fixed to the bottom shell 2 to fix the bridging piece 5 in the bridging groove 23. Thus, in this embodiment, the bridging piece 5 is directly embedded in the bridging groove 23 on the bottom shell 2 and then fixed by the bridging block 24 (it can be glued or snapped, and other methods are similar and will not be described in detail here). Other features are the same as in the above embodiment. This assembled bridging piece 5 adopts a precision pressing and glue sealing method. Its advantage is high flexibility, but the sealing performance of the whole piece is poor and other sealing solutions are required.

[0047] This invention has been described through preferred embodiments. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. This invention is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims are also within the protection scope of this invention.

Claims

1. A loudspeaker module with a bridging plate, comprising an upper shell (1) and a bottom shell (2), wherein the upper shell (1) and the bottom shell (2) are combined to form an assembly cavity (11) that mates with a sound-emitting body (3), and the bottom shell (2) is further provided with an FPC sheet (4) that mates with the sound-emitting body (3), wherein an inner connector (41) is fixedly provided at the extended end of the FPC sheet (4) within the bottom shell (2), characterized in that, A bridging piece (5) is fixed inside the bottom shell (2) between the inner connecting piece (41) and the external circuit. One end of the bridging piece (5) is connected to the inner connecting piece (41) through an electrical connection structure (6), and the other end extends to the outside of the bottom shell (2) to form an external part (51) that cooperates with the external circuit. The bridging piece (5) has a plurality of arched structures (52) between the inner connecting piece (41) and the external part (51). The height of the arched structures (52) on the plurality of bridging pieces (5) decreases from the middle to both ends. The electrical connection structure (6) includes a plurality of electrical contact springs (61) arranged linearly between the inner contact piece (41) and the bridging piece (5). The electrical contact springs (61) are arc-shaped pieces. One end of the electrical contact spring (61) is fixed with an adhesive block (611), and the other end is fixed with a fine-tuning block (612). The inner contact piece (41) is provided with an adhesive groove (411) that cooperates with the adhesive block (611) and a micro-sliding groove (412) that cooperates with the fine-tuning block (612) along the length direction of the electrical contact spring (61) on the side near the bridging piece (5). The length of the micro-sliding groove (412) is greater than the length of the fine-tuning block (612), and the edges of the micro-sliding groove (412) and the fine-tuning block (612) are stepped. The bridging piece (5) and the inner piece (41) have an electrical connection groove (53) at one end that mates with the electrical connection spring (61). The bottom of the electrical connection spring (61) is a flat bottom that mates with the bottom plane of the electrical connection groove (53). After assembly, the adhesive block (611) is bonded and fixed to the adhesive groove (411), the fine adjustment block (612) is slidably connected to the micro sliding groove (412), the bottom of the electrical connection spring (61) abuts against the bottom of the electrical connection groove (53), and the electrical connection spring (61) is in a pressed state. The bottom shell (2) is also fixed with a pressure adjusting column (21) that cooperates with the inner plate (41). The inner plate (41) is provided with a pressure adjusting hole (413) that cooperates with the pressure adjusting column (21). The inner plate (41) is a rigid plate. The pressure adjusting column (21) is also provided with a pressure adjusting ring (211) to press the inner plate (41) along the pressure adjusting column (21) toward the bridging plate (5). The inner contact piece (41) is also provided with a connection contact (414) that cooperates with the adhesive groove (411), and the FPC piece (4) is electrically connected to the bridging piece (5) through the electrical contact spring (61).

2. A speaker module with a bridging plate according to claim 1, characterized in that, The bottom shell (2) is also provided with two positioning posts (22) that cooperate with the FPC sheet (4), and the positioning posts (22) pass through the FPC sheet (4).

3. A speaker module with a bridging plate according to claim 1, characterized in that, The arched structure (52) is one of C-shaped, U-shaped or Z-shaped, the bridging piece (5) is made of rigid material, and the bridging piece (5) is fixed in the bottom shell (2) by injection molding.

4. A speaker module with a bridging plate according to claim 1, characterized in that, The bottom shell (2) is provided with a bridging groove (23) that mates with the bridging piece (5), and the bridging piece (5) is embedded in the bridging groove (23); it also includes a bridging block (24) that mates with the bridging groove (23). After the bridging piece (5) is embedded in the bridging groove (23), the bridging block (24) is fixed to the bottom shell (2) to fix the bridging piece (5) in the bridging groove (23).

5. A speaker module with a bridging plate according to claim 1, characterized in that, The sound-generating body (3) includes a sound-generating unit and a magnetic circuit unit that drives the sound-generating unit to generate sound. The FPC sheet (4) is connected to the voice coil of the sound-generating unit.

6. A method for manufacturing a loudspeaker module with a bridging plate, used to manufacture a loudspeaker module with a bridging plate as described in any one of claims 1 to 5, characterized in that, Includes the following steps: S00: Prefabricated bridging piece (5) and FPC piece (4), the bridging piece (5) is made of a material with good conductivity, elasticity and certain rigidity, and an arched structure (52) is made on the bridging piece (5) by precision stamping; the FPC piece (4) has reserved solder pads or contacts for connection with the voice coil, and the other end extends out to form an inner contact piece (41) connected with the bridging piece (5), and the electrical contact spring (61) is assembled; S10: Inject the upper shell (1) and the bottom shell (2), and use the pre-made bridging piece (5) as an insert to accurately place it in the designated position of the bottom shell (2) mold. After injecting material into the bottom shell (2) mold, fix the bridging piece (5) inside the bottom shell (2) body. The outer part (51) of the bridging piece (5) will extend out of the bottom shell (2). S20: Internal assembly of the speaker module, the FPC piece (4) is installed at a predetermined position on the bottom shell (2), the voltage adjustment hole (413) on the inner connector (41) is fitted into the voltage adjustment column (21) of the bottom shell (2), and the voltage adjustment ring (211) is pressed into the voltage adjustment column (21) to press the inner connector (41) axially toward the bridge piece (5) along the voltage adjustment column (21), so that the inner connector (41) and the bridge piece (5) are connected by the electrical contact spring (61); S30: Install the sound generator (3) into the assembly cavity (11) of the bottom shell (2), connect the voice coil of the sound generator (3) to the FPC piece (4), and fasten the upper shell (1) to the bottom shell (2) that has been internally assembled to form a complete assembly cavity (11).

7. A method for manufacturing a speaker module with a bridging plate according to claim 6, characterized in that, In step S00, the step of assembling the electrical contact spring (61) on the inner contact piece (41) is as follows: the inner contact piece (41) is fixed on the fixture, and the adhesive block (611) of the electrical contact spring (61) is pasted and fixed into the adhesive groove (411) of the inner contact piece (41); the fine adjustment block (612) of the electrical contact spring (61) is inserted into the micro sliding groove (412) to ensure that the fine adjustment block (612) and the micro sliding groove (412) are slidably connected.

Images