Loudspeaker module and electronic device

Abstract

The application discloses a loudspeaker module and an electronic device. The loudspeaker module comprises a shell, a loudspeaker unit and an adjusting module. The shell has a containing cavity. The loudspeaker unit is arranged in the containing cavity and is configured to convert an electric signal into an acoustic signal. The adjusting module is connected with the loudspeaker unit and is arranged in the containing cavity. A back sound cavity is formed between the adjusting module and the loudspeaker unit. The adjusting module is configured to adjust the volume of the back sound cavity according to the frequency characteristics of the acoustic signal when powered on. The function of the adjustable back sound cavity is realized, and the acoustic performance of the loudspeaker module for acoustic signals of different frequencies is improved.

Description

Technical Field

[0001] This application relates to the field of sound-generating devices, and more specifically, to a loudspeaker module and electronic device. Background Technology

[0002] With the development of technology, most electronic devices are equipped with speaker modules to meet the sound-producing function of electronic devices, and the acoustic effect of speaker modules has a significant impact on the immersive experience of using electronic devices.

[0003] In existing technologies, speaker modules typically have a front acoustic cavity and a rear acoustic cavity, and the size of the rear acoustic cavity has a significant impact on the acoustic performance of the speaker module. Currently, the rear acoustic cavity volume of speaker modules on the market is fixed, and the sound effect cannot be adapted to different music frequencies, resulting in poor acoustic performance. This is especially true for VR or AR devices used in gaming and audio-visual applications, which often require external speaker functionality. Due to the fixed size of the rear acoustic cavity, the bass variation and impact cannot meet the playback requirements of different styles. Even with software calibration and correction, a sufficiently rich and detailed acoustic performance cannot be achieved. Summary of the Invention

[0004] One objective of this application is to provide a new technical solution for speaker modules and electronic devices.

[0005] According to a first aspect of this application, a speaker module is provided, comprising:

[0006] A housing having a receiving cavity inside;

[0007] A loudspeaker unit, wherein the loudspeaker unit is disposed in the receiving cavity and configured to convert electrical signals into sound signals;

[0008] An adjustment module is electrically connected to the speaker unit and disposed in the receiving cavity, and a rear acoustic cavity is formed between the adjustment module and the speaker unit;

[0009] The adjustment module is configured to adjust the volume of the rear acoustic cavity according to the frequency characteristics of the sound signal when powered on.

[0010] Optionally, the adjustment module includes a grooved bracket, a movable component, and a drive component;

[0011] The grooved bracket is fixed to the inner wall of the housing, with its opening facing the speaker unit; the movable component is movably disposed within the grooved bracket, forming the rear acoustic cavity between the movable component and the speaker unit; the drive member is fixed within the grooved bracket and located on the side of the movable component away from the speaker unit.

[0012] The driving member is electrically connected to the speaker unit, and the driving member is configured to drive the movable member to move along the inner wall of the grooved bracket toward or away from the speaker unit in order to adjust the volume of the rear acoustic cavity.

[0013] Optionally, the driving component is a telescopic electromagnet, which has a telescopic shaft. When the telescopic electromagnet is energized, the telescopic shaft can extend or retract in the direction toward the speaker unit, and the movable component is fixed to the telescopic shaft.

[0014] Optionally, the drive element has a maximum stroke and a minimum stroke;

[0015] With the drive member at its maximum stroke, the movable component is positioned close to the speaker unit, minimizing the volume of the rear acoustic cavity;

[0016] With the drive element at its minimum stroke, the active component is positioned away from the speaker unit, allowing the rear acoustic cavity to have its maximum volume.

[0017] Optionally, when the drive member is between the maximum stroke and the minimum stroke, the drive member can drive the movable component to a set position with the maximum stroke or the minimum stroke as the stroke reference, so that the rear acoustic cavity has a set volume.

[0018] Optionally, the movable component includes a partition fixed to the drive member, which is capable of driving the partition to move closer to or further away from the speaker unit to adjust the volume of the rear acoustic cavity.

[0019] Optionally, the movable component further includes a pressure plate and a spring, and the partition is provided with a receiving groove;

[0020] The spring is provided in at least two parts, the number of receiving slots matches the number of springs, and the receiving slots are evenly distributed radially on the partition.

[0021] At least two of the springs are disposed in the receiving grooves in a one-to-one correspondence, and the pressure plate is disposed on the side of the partition with the receiving grooves, thereby confining the springs within the receiving grooves.

[0022] Optionally, the movable component further includes ball bearings, the number of which matches the number of springs, with each ball bearing abutting against the inner wall of the spring and the grooved bracket in a one-to-one correspondence.

[0023] When the movable component moves toward or away from the speaker unit, the ball rolls along the inner wall of the grooved bracket.

[0024] Optionally, the inner wall of the grooved bracket is provided with a sliding groove, the number of which matches the number of the balls. When the movable component moves toward or away from the speaker unit, the balls roll along the sliding groove.

[0025] Optionally, the movable component further includes a sealant layer, and the partition is also provided with a receiving groove surrounding the periphery of the receiving groove. The pressing sheet and the sealant layer are respectively matched with the shape of the receiving groove, and the sealant layer is used to bond the pressing sheet to the partition.

[0026] Optionally, the movable component further includes a sealing ring, which is sleeved on the outer periphery of the partition, and the sealing ring is made of polytetrafluoroethylene material;

[0027] The partition plate is also provided with vent holes located between any two of the receiving slots, and the vent holes can balance the air pressure on both sides of the movable component.

[0028] Optionally, the active component further includes a waterproof and breathable membrane disposed at the vent.

[0029] Optionally, the grooved bracket is fixed to the inner wall of the housing with sealant to seal the rear acoustic cavity.

[0030] According to a second aspect of this application, an electronic device is provided, including the speaker module described in the first aspect.

[0031] According to one embodiment of this application, by providing an adjustment module electrically connected to the speaker unit inside the housing of the speaker module, and enabling the adjustment module to adjust the volume of the acoustic cavity according to the frequency characteristics of the sound signal emitted by the speaker unit when powered on, the acoustic performance of the speaker module for sound signals of different frequencies is improved.

[0032] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0033] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.

[0034] Figure 1 This is a schematic diagram of a speaker module provided in this application.

[0035] Figure 2 yes Figure 1 Sectional view along direction A.

[0036] Figure 3 This is an exploded view of a speaker module provided in this application.

[0037] Figure 4 This is a schematic diagram of the adjustment module provided in this application.

[0038] Figure 5 yes Figure 4 Exploded view.

[0039] Figure 6 This is an assembly diagram of the spring and ball provided in this application.

[0040] Figure 7 yes Figure 2 A schematic diagram of the structure when the rear acoustic cavity is at its maximum.

[0041] Figure 8 yes Figure 2 A schematic diagram of the structure with the smallest possible rear acoustic cavity.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Housing; 11. Front housing; 12. Rear housing; 2. Speaker driver; 3. Adjustment module; 31. Groove bracket; 311. Slide groove; 32. Telescopic electromagnet; 321. Telescopic shaft; 322. Screw; 33. Partition; 331. Receiving groove; 332. Retaining groove; 333. Vent hole; 34. Pressure plate; 35. Ball bearing; 36. Spring; 37. Sealing layer; 38. Sealing ring; 39. Waterproof and breathable membrane; 4. Front acoustic cavity; 5. Rear acoustic cavity; 6. Sealing compound; 7. Dustproof mesh; 8. Earplug. Detailed Implementation

[0044] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0045] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0046] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0047] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0048] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0049] like Figures 1 to 6 As shown, this application provides a speaker module, including a housing 1, a speaker unit 2, and an adjustment module 3; wherein, the housing 1 has a receiving cavity; the speaker unit 2 is disposed in the receiving cavity and is configured to convert electrical signals into sound signals; the adjustment module 3 is electrically connected to the speaker unit 2 and is disposed in the receiving cavity, and a rear acoustic cavity 5 is formed between the adjustment module 3 and the speaker unit 2. The adjustment module 3 is configured to adjust the size of the rear acoustic cavity 5 according to the frequency characteristics of the sound signal when powered on.

[0050] Specifically, in this application, the loudspeaker module has a housing 1 and a loudspeaker unit 2 and an adjustment module 3 disposed within the receiving cavity of the housing 1. The loudspeaker unit 2 typically includes a vibration system and a magnetic circuit system. The vibration system typically includes a diaphragm and a voice coil disposed on one side of the diaphragm. The magnetic circuit system includes a permanent magnet. In practical applications, when the voice coil is energized, it is subjected to the Ampere force in the magnetic field formed by the permanent magnet, causing it to vibrate, thereby driving the diaphragm to vibrate and achieving the purpose of converting electrical signals into sound signals.

[0051] The diaphragm in the speaker unit 2 typically divides the housing 1 into a front acoustic cavity 4 and a rear acoustic cavity 5. The front acoustic cavity 4 is connected to the outside and is used to emit sound to the outside, while the rear acoustic cavity 5 affects the acoustic effect of the sound signal. Since the volume of the rear acoustic cavity 5 will be different for different frequency sound signals, the size of the rear acoustic cavity 5 has a significant impact on the final sound performance of the speaker module, especially on the low frequency part.

[0052] In this embodiment, by providing an adjustment module 3 on one side of the speaker unit 2, the space between the adjustment module 3 and the speaker unit 2 can form the rear acoustic cavity 5 of the speaker module. The adjustment module 3, when powered on, can adjust the size of the rear acoustic cavity 5 by controlling its own position, based on the frequency characteristics of the sound signal emitted by the speaker unit 2. This ensures that the size of the rear acoustic cavity 5 matches the sound signal emitted by the speaker unit 2, thereby improving the acoustic performance of the speaker module. In particular, for the low-frequency part of the sound signal, increasing the size of the rear acoustic cavity 5 improves the low-frequency characteristics, making the sound more pleasing to the user subjectively. The adjustment module 3 can adjust the size of the rear acoustic cavity 5 by adjusting its position within the housing 1, or by adjusting the position of some of its components; this application does not limit this.

[0053] Optionally, refer to Figure 2 and Figure 5 The adjustment module 3 includes a grooved bracket 31, a movable component, and a drive component. The grooved bracket 31 is fixed to the inner wall of the housing 1, with its opening side facing the speaker unit 2. The movable component is movably disposed within the grooved bracket 31, forming a rear acoustic cavity 5 between the movable component and the speaker unit 2. The drive component is fixed within the grooved bracket 31 and is located on the side of the movable component away from the speaker unit 2. The drive component is electrically connected to the speaker unit 2, and the drive component is configured to drive the movable component to move along the inner wall of the grooved bracket 31 toward or away from the speaker unit 2, so as to adjust the volume of the rear acoustic cavity 5.

[0054] Specifically, in this embodiment, the adjustment module 3 has a grooved bracket 31 for supporting the movable component and the driving component, and also provides a movable position for the movable component. When energized, the driving component can drive the movable component to move along the inner wall of the grooved bracket 31. Since a rear acoustic cavity 5 of the speaker module is formed between the movable component and the speaker unit 2, when the driving component drives the movable component to move closer to the speaker unit 2, the volume of the rear acoustic cavity 5 formed between the movable component and the speaker unit 2 gradually increases, thereby improving the performance of the low-frequency sound signal emitted by the speaker module. When the driving component drives the movable component to move away from the speaker unit 2, the volume of the rear acoustic cavity 5 formed between the movable component and the speaker unit 2 gradually decreases to match different sound signals.

[0055] Optionally, the drive member has a maximum stroke and a minimum stroke; when the drive member is at its maximum stroke, the movable component is located close to the speaker unit 2, so that the rear acoustic cavity 5 has a minimum volume; when the drive member is at its minimum stroke, the movable component is located away from the speaker unit 2, so that the rear acoustic cavity 5 has a maximum volume.

[0056] Specifically, in practical applications, the stroke of the driving component that moves the moving parts can be controlled by turning the driving component on and off. For example... Figure 7 The diagram shows the drive component moving to its minimum stroke (denoted as H). min At point ) the position state of the moving component, the volume of the rear acoustic cavity 5 formed between the moving component and the speaker unit 2 is at its maximum (denoted as V). max At this point, the speaker module performs best in reproducing low-frequency sound signals. Among them, V max It needs to be limited to a certain threshold range; otherwise, the improvement of the low-frequency part of the sound signal by the rear acoustic cavity 5 will decrease sharply. This threshold range can be designed according to the characteristics of the speaker module itself, and this application does not impose any restrictions on it. Figure 8 The diagram shows the drive component moving to its maximum stroke (denoted as H). max At point ) the position state of the moving component, at which point the volume of the rear acoustic cavity 5 formed between the moving component and the speaker unit 2 is at its minimum (denoted as V). min ).

[0057] Optionally, when the drive member is between its maximum and minimum stroke, the drive member can use the maximum or minimum stroke as a stroke reference to drive the movable component to a set position so that the rear acoustic cavity 5 has a set volume.

[0058] Specifically, based on the above embodiments, when controlling the movement stroke of the drive component relative to the moving component, it can be expressed in terms of H. max or H min The volume of the rear acoustic cavity 5 at a given time is used as the switching reference between different rear acoustic cavity 5 volumes. Preferably, H is used as the reference. min V at time max Switching the reference, at this time, V max It can be designed as the threshold volume of the speaker module, so that it can take into account more of the positional adjustment of the rear acoustic cavity 5, so as to meet the different requirements of the rear acoustic cavity 5 volume for more different frequency sound signals.

[0059] For example, in one embodiment, when the active component is at a certain position H1 and needs to be adjusted to another position H2 according to the audio characteristics of the sound signal, the adjustment logic is: H1-H min -H2, which means controlling the energizing duration of the driving component to cause the moving part to first return from H1 to the reference position H. min Then from the reference position H min Move the component to H2, then de-energize the drive unit to keep the moving part at H2. Other position adjustments can be made using H... maxThe same logic is used as the switching reference for position adjustment. By switching the drive unit on and off, the drive unit can accurately control the movement of the moving component to the required position, improving the accuracy of the drive unit's control over the movement stroke of the moving component. The drive unit can be implemented using devices such as electromagnets or voice coil motors; this application does not impose any restrictions on this.

[0060] Optionally, such as Figures 2 to 8 As shown, the driving component is a telescopic electromagnet 32, which has a telescopic shaft 321. When the telescopic electromagnet 32 ​​is energized, the telescopic shaft 321 can extend and retract in the direction toward the speaker unit 2, and the movable component is fixed on the telescopic shaft 321.

[0061] Specifically, in this embodiment, the driving component can be a telescopic electromagnet 32, whose telescopic shaft 321 can extend or retract axially when energized. The movable component is sleeved and fixed on the telescopic shaft 321, allowing it to move along the inner wall of the grooved bracket 31 by extending or retracting the telescopic shaft 321, thus moving away from or closer to the speaker unit 2. The connection between the movable component and the telescopic rod can be achieved using screws 322, such as... Figures 4 to 6 As shown, a hole is made in the center of the telescopic shaft 321, and the movable component is fastened to the telescopic shaft 321 by setting screws 322. The assembly method of screws 322 makes the assembly of the drive component and the movable component more convenient, thereby improving assembly efficiency and reducing production costs.

[0062] Optionally, the movable component includes a partition 33, which is fixed to a drive member. The drive member can drive the partition 33 to move closer to or further away from the speaker unit 2 to adjust the volume of the rear acoustic cavity 5.

[0063] Specifically, in this embodiment, the partition 33 is fixed to the driving member to form a rear acoustic cavity 5 between itself and the speaker unit 2. Driven by the driving member, it can move towards or away from the speaker unit 2, causing the volume of the rear acoustic cavity 5 to increase or decrease, thus adjusting the volume of the rear acoustic cavity 5. The partition 33 is configured to match the inner wall shape of the grooved support 31, thereby achieving a seal for the rear acoustic cavity 5.

[0064] Optionally, the movable component also includes a pressure plate 34 and a spring 36, and the partition 33 is provided with a receiving groove 331; wherein, at least two springs 36 are provided, the number of receiving grooves 331 matches the number of springs 36, and the receiving grooves 331 are radially and evenly distributed on the partition 33; at least two springs 36 are correspondingly provided in the receiving grooves 331, and the pressure plate 34 is provided on the side of the partition 33 with the receiving grooves 331, thereby confining the springs 36 in the receiving grooves 331.

[0065] Specifically, in this embodiment, the movable component has a partition 33 and a spring 36 mounted on the partition 33. The spring 36 is then pressed together by a pressure plate 34, making the movable component a single movable module for easy assembly. The receiving groove 331 on the partition 33 allows the spring 36 to extend and retract only along its axial direction, restricting its radial movement. In this structure, the spring 36 provides a balancing function.

[0066] Optionally, the movable component also includes ball bearings 35, the number of which matches the number of springs 36, with each ball bearing 35 abutting against the inner wall of the spring 36 and the grooved bracket 31 respectively; when the movable component moves toward or away from the speaker unit 2, the ball bearings 35 roll along the inner wall of the grooved bracket 31.

[0067] Specifically, in this embodiment, the ball bearing 35 is clamped together by the pressure plate 34, positioning it between the spring 36 and the grooved bracket 31. When the moving component is driven by the drive member, the spring 36 can push the ball bearing 35 to move more smoothly and steadily along the inner wall of the grooved bracket 31, preventing the moving component from jamming or tilting due to excessive damping during movement. In this structure, the ball bearing 35 provides a spherical fit with the grooved bracket 31, making the movement smoother.

[0068] In the above embodiments, reference is made to Figures 4 to 6 The number of springs 36 can be adapted to the shape of the grooved bracket 31. For example, in cylindrical or rectangular structures, four springs 36 can be designed to make the contact and force between the moving component and the grooved bracket 31 more balanced. Correspondingly, the number of balls 35 can also be designed to be four, and the receiving grooves 331 on the partition 33 for accommodating the springs 36 are also matched with four grooves. The multiple receiving grooves 331 are evenly distributed radially on the partition 33, which can also make the contact force between the moving component and the grooved bracket 31 more uniform. In addition, the balls 35 can be steel balls to improve the smoothness of the moving component moving along the inner wall of the grooved bracket 31.

[0069] Optionally, such as Figure 5 As shown, a groove 311 is provided on the inner side wall of the groove-shaped bracket 31. The number of grooves 311 matches the number of balls 35. When the movable component moves toward or away from the speaker unit 2, the balls 35 roll along the groove 311.

[0070] Specifically, in this embodiment, a groove 311 is provided on the inner sidewall of the grooved bracket, so that the ball 35 can be assembled in the groove 311 to limit the movement trajectory of the ball 35. That is, the design of the groove 311 can control the movement trajectory of the entire moving component in the grooved bracket 31, so that the drive can more accurately control the movement stroke of the moving component.

[0071] Optionally, refer to Figures 5 to 6 The active components also include a sealant layer 37, and the partition 33 is also provided with a receiving groove 332 surrounding the receiving groove 331. The pressing sheet 34 and the sealant layer 37 are respectively matched with the shape of the receiving groove 332, and the sealant layer 37 is used to bond the pressing sheet 34 to the partition 33.

[0072] Specifically, such as Figure 2 , Figure 5 and Figure 6 As shown, the partition 33 has a receiving groove 332 around the receiving groove 331, so that the pressure plate 34 can be bonded to one side of the partition 33 through the sealing adhesive layer 37. On the one hand, the pressure plate 34 can realize the function of pressing the spring 36 and the ball 35. On the other hand, it can reduce the overall weight of the moving components to achieve the effect of lightweight speaker module.

[0073] Optionally, refer to Figure 5 The movable component also includes a sealing ring 38, which is sleeved on the outer periphery of the partition 33 and is made of polytetrafluoroethylene. The partition 33 is also provided with vent holes 333 between any two receiving grooves 331, which can balance the air pressure on both sides of the movable component.

[0074] Specifically, in this embodiment, such as Figures 2 to 6 As shown, on the one hand, the sealing ring 38, fitted around the periphery of the partition 33, enables the partition 33 to seal and separate itself on the side closer to the speaker unit 2 and the side farther from the speaker unit 2, thus sealing the acoustic cavity 5. On the other hand, the sealing ring 38 is made of polytetrafluoroethylene (PTFE), a material with a certain compressibility and wear resistance. This provides frictional damping for the moving components during movement, allowing them to accurately stop at the set position. Combined with the design of the spring 36 and the ball bearing 35, this makes the movement of the moving components smoother. The shape of the sealing ring 38 matches the outer contour formed by the partition 33, the spring 36, and the ball bearing 35.

[0075] Further, refer to Figures 4 to 6To prevent the air pressure on both sides of the partition 33 from becoming unbalanced due to the sealing ring 38, which could lead to compression on one side of the partition 33 preventing it from being pushed during the movement of the movable component, vent holes 333 are provided on the partition 33. This helps to balance the air pressure on both sides of the partition 33, allowing the movable component to move more smoothly. The diameter of the vent holes 333 can be set to 1.2mm to 1.4mm, ensuring that the space on both sides of the partition 33 is sealed while balancing the air pressure.

[0076] Optionally, refer to Figures 4 to 6 The active component also includes a waterproof and breathable membrane 39, which is disposed at the vent holes 333. The waterproof and breathable membrane 39 can be made of IPRO PF-Y015 (a material model of a waterproof and breathable membrane 39 produced by IPRO), and the size of its breathable area can be designed to match the diameter of the vent holes 333, ranging from 1.0mm to 1.2mm, to prevent moisture, dust, etc. from entering the rear acoustic cavity 5.

[0077] Optionally, such as Figure 2 As shown, the grooved bracket 31 is fixed to the inner wall of the housing 1 by sealant 6 to seal the rear acoustic cavity 5.

[0078] Specifically, in practical applications, since the moving component is a moving part, its movement will cause the grooved bracket 31 to tend to move. The grooved bracket 31 is fixed to the inner wall of the housing 1 using sealant 6, making it more stable and ensuring the robustness and reliability of the adjustment module 3. In actual production, the sealant 6 can be applied using a hot melt adhesive process. The grooved bracket can be injection molded from high-strength, high-toughness materials such as PC (polycarbonate) or ABS (acrylonitrile-butadiene-styrene copolymer).

[0079] like Figures 1 to 3 As shown, this application also provides an electronic device, including the speaker module provided in any of the above embodiments.

[0080] Specifically, the electronic device using the speaker module provided in this embodiment, because the speaker module has an adjustable rear acoustic cavity 5 to match sound signals of different frequencies, enables the electronic device to perform better acoustic effects in its sound output function, thus improving the user experience. The electronic device can be a TWS earphone (true wireless Bluetooth earphone), VR (virtual reality), or AR (augmented reality) device, etc.

[0081] like Figures 1 to 3As shown, in one embodiment, an earphone is provided, which includes a front shell 11 and a rear shell 12, and an adjustment module 3 and a speaker unit 2 disposed within a receiving cavity formed by the front shell 11 and the rear shell 12. The speaker unit 2 divides the receiving cavity into a front acoustic cavity 4 and a rear acoustic cavity 5, and the space between the adjustment module 3 and the speaker unit 2 is the effective rear acoustic cavity 5. The front acoustic cavity 4 communicates with the outside, and a metal dustproof mesh 7 and soft rubber earplugs 8 are disposed at the opening of the front acoustic cavity 4.

[0082] In practical applications, the adjustment module 3 is electrically connected to the speaker unit 2, and can also be connected to the headphone's main control module. After the speaker unit 2 emits a sound signal, the driver can adjust the volume of the rear acoustic cavity 5 according to the frequency of the sound signal to match the sound signal and improve the acoustic performance of the headphones. The determination of the sound signal frequency can be achieved through the headphone's main control module, which then controls the adjustment module 3 to adjust the volume of the rear acoustic cavity 5. Alternatively, the adjustment module 3 can directly acquire the sound signal from the speaker unit 2 for determination; this application does not impose any limitations on this approach.

[0083] The above embodiments mainly describe the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be elaborated here.

[0084] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A speaker module, characterized in that, include: A housing having a receiving cavity inside; A loudspeaker unit, wherein the loudspeaker unit is disposed in the receiving cavity and configured to convert electrical signals into sound signals; An adjustment module is disposed in the receiving cavity. The adjustment module includes a grooved bracket, a movable component, and a driving component. The grooved bracket is fixed to the inner wall of the housing, with its opening side facing the speaker unit. The movable component is movably disposed in the grooved bracket, so that a rear acoustic cavity is formed between the movable component and the speaker unit. The drive unit is fixed inside the grooved bracket and located on the side of the movable component away from the speaker unit. The drive unit is electrically connected to the speaker unit and is configured to, when energized, drive the movable component to move along the inner wall of the grooved bracket toward or away from the speaker unit according to the frequency characteristics of the sound signal, so as to adjust the volume of the rear acoustic cavity. The movable components include a partition, a pressure plate, a spring, and ball bearings; The partition plate has radially and evenly distributed receiving grooves, and the pressure plate is disposed on one side of the partition plate with the receiving grooves, thereby confining the spring within the receiving grooves; The ball bearings abut against the inner wall of the spring and the grooved bracket.

2. A speaker module according to claim 1, characterized in that, The driving component is a telescopic electromagnet, which has a telescopic shaft. When the telescopic electromagnet is energized, the telescopic shaft can extend and retract in the direction toward the speaker unit, and the movable component is fixed on the telescopic shaft.

3. A speaker module according to claim 1, characterized in that, The drive component has a maximum stroke and a minimum stroke; With the drive member at its maximum stroke, the movable component is positioned close to the speaker unit, minimizing the volume of the rear acoustic cavity; With the drive element at its minimum stroke, the active component is positioned away from the speaker unit, allowing the rear acoustic cavity to have its maximum volume.

4. A speaker module according to claim 3, characterized in that, When the drive member is between the maximum stroke and the minimum stroke, the drive member can drive the movable component to a set position with the maximum stroke or the minimum stroke as the stroke reference, so that the rear acoustic cavity has a set volume.

5. A speaker module according to claim 1, characterized in that, The partition is fixed to the driving member, which can drive the partition to move closer to or further away from the speaker unit to adjust the volume of the rear acoustic cavity.

6. A speaker module according to claim 5, characterized in that, The spring is provided with at least two, and the number of receiving slots matches the number of springs. At least two of the springs are arranged in the receiving groove in a one-to-one correspondence.

7. A speaker module according to claim 6, characterized in that, The number of balls is matched with the number of springs; When the movable component moves toward or away from the speaker unit, the ball rolls along the inner wall of the grooved bracket.

8. A speaker module according to claim 7, characterized in that, The inner wall of the grooved bracket is provided with a sliding groove, the number of which matches the number of the balls. When the movable component moves toward or away from the speaker unit, the balls roll along the sliding groove.

9. A speaker module according to claim 6, characterized in that, The movable component also includes a sealant layer, and the partition is further provided with a receiving groove surrounding the periphery of the receiving groove. The pressing sheet and the sealant layer are respectively matched with the shape of the receiving groove, and the sealant layer is used to bond the pressing sheet to the partition.

10. A speaker module according to claim 6, characterized in that, The movable component also includes a sealing ring, which is sleeved on the outer periphery of the partition and is made of polytetrafluoroethylene. The partition plate is also provided with vent holes located between any two of the receiving slots, and the vent holes can balance the air pressure on both sides of the movable component.

11. A speaker module according to claim 10, characterized in that, The active component also includes a waterproof and breathable membrane disposed at the vent holes.

12. A speaker module according to claim 1, characterized in that, The grooved bracket is fixed to the inner wall of the housing with sealant to seal the rear acoustic cavity.

13. An electronic device, characterized in that, Includes the speaker module according to any one of claims 1-12.

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