Sound cavity structure and electronic equipment

Abstract

The invention discloses a vocal cavity structure and electronic equipment. The vocal cavity structure comprises a middle frame, a rear shell and a loudspeaker. The rear shell is located on one side of the middle frame. The loudspeaker is located between the middle frame and the rear shell, a groove is formed in the side, facing the rear shell, of the loudspeaker, a front sound cavity of the loudspeaker is defined by the groove and the rear shell, and the front sound cavity is used for correcting high-frequency noise. According to the sound cavity structure, the loudspeaker is inverted, the open type front sound cavity faces the rear shell, and the rear shell and the groove of the loudspeaker are used for dispensing sealing. Therefore, the overall thickness of the acoustic cavity structure is reduced, the acoustic cavity structure is suitable for electronic equipment with limited z-direction space, and a loudspeaker scheme of an open front acoustic cavity can be realized. The vocal cavity structure does not occupy too much z-direction space of the electronic equipment, and the light and thin development of the electronic equipment is facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of terminal equipment, and in particular to an acoustic cavity structure and electronic equipment. Background Art

[0002] Electronic devices are equipped with speakers to provide sound playback capabilities. The speaker includes a housing and a speaker core housed within the housing. The speaker core and the housing form a front cavity and a rear cavity. The speaker can have an open cavity (hereinafter referred to as an open speaker). For open speakers with an open front cavity and a closed rear cavity, the open front cavity of the open speaker is sealed from the midframe of the electronic device to form the speaker's front cavity.

[0003] However, the open speaker and the middle frame are usually sealed with foam glue, which takes up the thickness space of the electronic device and is not conducive to the lightweight development of the electronic device. Summary of the Invention

[0004] The present application provides a sound cavity structure and an electronic device to solve the problem that the speaker occupies the thickness space of the electronic device.

[0005] In a first aspect, the present application provides a sound cavity structure comprising: a middle frame, a rear housing, and a speaker. The rear housing is located on one side of the middle frame; the speaker is located between the middle frame and the rear housing, and the side of the speaker facing the rear housing includes a groove. The groove and the rear housing enclose a front sound cavity of the speaker, which is used to correct high-frequency noise.

[0006] The acoustic cavity structure provided in the embodiment of the present application inverts the speaker, with the open front cavity facing the rear shell, and uses the grooves between the rear shell and the speaker for glue sealing. Compared with existing solutions, the acoustic cavity structure can save the thickness difference between the foam glue and the glue in the z-direction space, as well as avoid gaps. In this way, not only can the speaker solution with an open front cavity be realized, but the overall thickness of the acoustic cavity structure can also be reduced, which is suitable for electronic devices with limited z-direction space; the acoustic cavity structure will not occupy too much z-direction space of the electronic device, which is conducive to the development of lightweight and thin electronic devices.

[0007] In some implementations, the middle frame includes a middle plate, middle frame side walls, and a partition. The middle frame side walls surround the edge of the middle plate, and the partition is located on the middle plate. The middle plate, middle frame side walls, and partition form a placement area. The speaker is located within the placement area and abuts between the middle frame side walls and the partition. In this way, the speaker is assembled with the middle frame and pressed against the middle frame along the y-axis, ensuring the sealing effect of the sealing bevel and the stability of the speaker and the middle frame.

[0008] In some implementations, one end of the speaker facing the middle frame side wall includes a first sloped surface; the first sloped surface is inclined along the direction from the rear housing to the middle frame, toward the middle frame side wall. The middle frame side wall includes a second sloped surface facing the speaker; the second sloped surface is inclined along the direction from the middle frame to the rear housing, toward the partition; the second sloped surface has the same inclination angle as the first sloped surface and abuts the first sloped surface. In this way, securing one side of the speaker to the middle frame side wall using the sloped surface not only ensures a tight seal between the speaker and the middle frame side wall, but also prevents the speaker from sliding along the z-axis toward the middle plate, thereby achieving z-axis fixation of the speaker.

[0009] In some implementations, the acoustic cavity structure further includes a sealing rib located between the first inclined surface and the second inclined surface to seal the speaker and the side wall of the middle frame. This can improve the planar sealing effect between the speaker and the side wall of the middle frame.

[0010] In some implementations, the middle frame sidewalls include a sealing surface facing the rear housing; the sealing surface is coplanar with the edge of the groove. The acoustic cavity structure also includes an adhesive layer; the adhesive layer is continuously formed on the sealing surface and the edge of the groove, and is bonded to the rear housing to enclose the front acoustic cavity of the speaker. This ensures the sealing and stability between the rear housing and the middle frame sidewalls, and also ensures the sealing effect of the front acoustic cavity.

[0011] In some implementations, the side wall of the middle frame includes a sound outlet; the sound outlet is located between the sealing surface and the second inclined surface; and the sound outlet communicates with the front sound cavity of the speaker. The sound outlet is inclined along the direction from the middle frame to the rear housing, with the end of the sound outlet facing the interior of the sound cavity structure adjacent to the rear housing to communicate with the front sound cavity of the speaker. In this way, the sound generated by the speaker during operation is transmitted to the sound outlet channel. After the sound is concentrated in the sound outlet channel, it is transmitted to the external environment through the sound outlet, achieving sound diffusion.

[0012] In a second aspect, the present application provides an electronic device, comprising: a display module, and the acoustic cavity structure provided in the first aspect; the display module is located on a side of the middle frame facing away from the rear shell.

[0013] It can be understood that the electronic device provided in the second aspect is applied to the acoustic cavity structure provided in the first aspect. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the acoustic cavity structure provided in the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0015] Figure 1 is a structural diagram of an electronic device provided in an embodiment of the present application;

[0016] Figure 2 yes Figure 1 Schematic diagram of the local structure of the AA section;

[0017] Figure 3 yes Figure 1 Schematic diagram of the local structure of area B in the middle;

[0018] Figure 4 This is a first structural diagram of the acoustic cavity structure provided in an embodiment of the present application;

[0019] Figure 5 This is a second structural diagram of the acoustic cavity structure provided in an embodiment of the present application;

[0020] Figure 6 3 is a schematic structural diagram of a speaker 300 provided in an embodiment of the present application;

[0021] Figure 7 yes Figure 6 Schematic diagram of the structure of the CC section;

[0022] Figure 8 1 is a schematic structural diagram of the middle frame 100 and the rear housing 200 provided in an embodiment of the present application;

[0023] Figure 9 This is a third structural diagram of the acoustic cavity structure provided in an embodiment of the present application;

[0024] Figure 10 yes Figure 9 Schematic diagram of the local structure of the D area in the middle;

[0025] Figure 11 1 is a schematic structural diagram of the middle frame 100 provided in an embodiment of the present application;

[0026] Figure 12 yes Figure 11 Schematic diagram of the local structure of the middle E area;

[0027] Figure 13 This is a fourth structural diagram of the acoustic cavity structure provided in an embodiment of the present application;

[0028] Figure 14 This is a first cross-sectional structural diagram of an electronic device provided in an embodiment of the present application;

[0029] Figure 15 This is a second cross-sectional structural diagram of the electronic device provided in an embodiment of the present application.

[0030] Illustration: 10-first body, 11-middle frame, 111-frame, 112-middle plate, 12-sound hole, 13-back cover, 20-second body, 30-screen, 40-hinge mechanism, 50-speaker module, 51-front cavity, 60-foam glue, 100-middle frame, 101-middle plate, 1011-through hole, 102-middle frame side wall, 1021-second inclined surface, 1 022-sealing surface, 103-partition, 104-sound hole, 200-rear shell, 300-speaker, 301-groove, 302-shell, 3021-shell bottom, 3022-shell side wall, 303-core, 304-front sound cavity, 305-first inclined surface, 306-rear sound cavity, 400-sealing rib, 500-glue layer, 600-battery compartment, 700-display module. DETAILED DESCRIPTION

[0031] The following will clearly describe the technical solutions in the embodiments of the present application in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments of the present application, other embodiments obtained by ordinary technicians in this field without making any creative work are all within the scope of protection of this application.

[0032] In the description of this application, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "first," "second," etc. may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0033] In addition, in this application, directional terms such as "upper" and "lower" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they can change accordingly according to changes in the orientation of the components in the drawings.

[0034] The following explains the professional terms mentioned in the embodiments of the present application to facilitate understanding by those skilled in the art.

[0035] Hot melt adhesive is a plastic adhesive whose physical state changes with temperature within a certain temperature range. Hot melt adhesive is a 100% solid, fusible polymer that does not require solvents or water. It is solid at room temperature and becomes fluid when heated and melted to a certain temperature.

[0036] The electronic devices described in the embodiments of the present application include but are not limited to mobile phones, foldable screen mobile phones, notebook computers, tablet computers, laptop computers, personal digital assistants or wearable devices, etc. The following description uses the electronic device as a foldable screen mobile phone.

[0037] Figure 1 It is a structural diagram of an electronic device provided in an embodiment of the present application.

[0038] like Figure 1 As shown, the electronic device may include a first body 10, a second body 20, a screen 30, and a hinge mechanism 40. The first body 10 and the second body 20 are disposed on either side of the axis of the hinge mechanism 40. The first body 10 and the second body 20 are respectively connected to the hinge mechanism 40, and the hinge mechanism 40 can be rotated to reduce the angle between the first body 10 and the second body 20 until the electronic device is in a folded state; or to increase the angle between the first body 10 and the second body 20 until the electronic device is in an unfolded state.

[0039] The screen 30 covers the first body 10, the second body 20, and the hinge mechanism 40, and is connected to the first body 10 and the second body 20, respectively. Rotation of the first body 10 and the second body 20 can cause the screen 30 to bend or unfold. For example, the screen 30 can be a flexible, bendable screen with a bending region that allows it to bend in the bending region as the hinge mechanism 40 rotates. When the electronic device is in the unfolded state, the hinge mechanism 40 is also in the unfolded state. In the unfolded state, the first body 10 and the second body 20 are arranged parallel to each other on either side of the hinge mechanism 40, and the screen 30 lies flat on the hinge mechanism 40 in the unfolded state. When the electronic device is in the folded state, the hinge mechanism 40 is also in the folded state. In the folded state, the first body 10 and the second body 20 are arranged oppositely on either side of the hinge mechanism 40, and the hinge mechanism 40 compresses the screen 30 into a teardrop shape.

[0040] Depending on the rotational direction of the first body 10 and the second body 20, the flexible screen may be hidden inside the electronic device when it is folded, or it may wrap around the outside of the body. Specifically, when the first body 10 and the second body 20 are folded toward the front of the flexible screen, the flexible screen is hidden inside the electronic device when it is folded. Such an electronic device can be referred to as an internal folding screen electronic device, such as an internal folding screen mobile phone. When the first body 10 and the second body 20 are folded toward the back of the flexible screen, the flexible screen wraps around the outside of the electronic device when it is folded. Such an electronic device can be referred to as an external folding screen electronic device, such as an external folding screen mobile phone.

[0041] To facilitate the explanation of the positions of various components in an electronic device, an embodiment of the present application exemplarily establishes a three-dimensional coordinate system based on the electronic device, wherein the x-axis direction is the width direction of the electronic device, the y-axis direction is the length direction of the electronic device, and the z-axis direction is the thickness direction of the electronic device.

[0042] The electronic device is provided with a speaker module (not shown in the figure). The speaker module can be provided in the first body 10 and / or the second body 20. A speaker module is a component that converts electrical signals into sound signals for playback. The speaker module can be composed of a diaphragm, a voice coil, a permanent magnet, and a bracket. The operating principle of the speaker module may include: the electronic device sends an electrical signal, such as an audio signal, to the voice coil of the speaker module. When the electrical signal is applied to the voice coil of the speaker module, the voice coil generates an alternating magnetic field under the action of the electrical signal, and the permanent magnet also generates a constant magnetic field with constant magnitude and direction. Because the magnitude and direction of the magnetic field generated by the voice coil continuously change with the electrical signal, the interaction of the two magnetic fields causes the voice coil to move perpendicular to the direction of electrical signal transmission in the voice coil. Because the voice coil and diaphragm are connected, the diaphragm vibrates, and the vibration of the diaphragm causes the air to vibrate, producing sound.

[0043] The number of speaker modules can be one or more so that the electronic device has a sound playback function. Exemplarily, the speaker module is arranged in the first body 10 and is located at the top and / or bottom of the first body 10. The first body 10 includes a middle frame portion 11, the second body 20 includes a second middle frame portion (not shown in the figure), the screen 30 covers the middle frame portion 11 and the second middle frame portion, and the middle frame portion 11 and the second middle frame portion can rotate relative to each other as the hinge mechanism 40 is folded. It should be noted that the electronic device also includes electronic components such as batteries and camera components, which are not listed here one by one.

[0044] The middle frame 11 is provided with a sound outlet 12, which can be located at the top and / or bottom of the middle frame 11. The sound outlet 12 connects the interior and exterior of the electronic device. For example, if the bottom of the first body 10 includes a speaker module and the middle frame 11 is provided with a sound outlet 12, the sound outlet 12 communicates with the front sound cavity of the speaker module to form a sound channel, so that the sound from the speaker module is output to the external environment through the sound outlet 12. There are multiple sound outlets 12, and the multiple sound outlets 12 are arranged in a spaced relationship along the x-axis on the middle frame 11.

[0045] The first housing 10 also includes electronic components such as a circuit board, a controller, and a signal processor, all of which are not shown in the figure. The controller is the electronic device's central processing unit (CPU), and the signal processor is a power amplifier (PA), which amplifies or modifies audio signals to optimize the audio signal transmitted to the speaker and improve the audio performance of the electronic device.

[0046] The controller and signal processor are both mounted on the circuit board, and the controller is electrically connected to the signal processor. The controller transmits audio signals, and the signal processor receives the audio signals, amplifies and modifies the audio signals, and then transmits the processed audio signals. The speaker module is electrically connected to the signal processor, receives the processed audio signals, and vibrates and produces sound based on the received audio signals. The sound is diffused into the external environment through the sound outlet 12, thus realizing the sound production of the electronic device.

[0047] Figure 2 yes Figure 1 Schematic diagram of the local structure of the AA section.

[0048] like Figure 2 As shown, the middle frame portion 11 includes a frame portion 111 and a middle plate portion 112 . The frame portion 111 surrounds the edge of the middle plate portion 112 , and the sound outlet 12 is located on the frame portion 111 .

[0049] The first body 10 also includes a back cover 13. The screen 30 and the back cover 13 are located on opposite sides of the middle frame 11 and are fixed to the frame 111. The screen 30 is close to the middle plate 112, while the back cover 13 is away from the middle plate 112. Therefore, the back cover 13 and the middle frame 11 form the inner cavity of the first body 10, which is used to house the electronic components of the first body 10.

[0050] The speaker module 50 within the first body 10 is located between the middle frame 11 and the rear cover 13. The speaker module 50 is fixed to the middle frame 11 and is adjacent to the sound outlet 12. The sound outlet 12 and the front sound cavity of the speaker module 50 form a sound channel, allowing the sound from the speaker module 50 to diffuse from the sound outlet 12 to the external environment.

[0051] To ensure the stability of the speaker module 50 and the middle frame 11, the speaker module 50 is usually fixed to the middle plate 112 using foam glue 60. The foam glue 60 not only provides good sealing but also provides reliable bonding performance, and the two structural components bonded by the foam glue 60 can be separated by external force.

[0052] If the speaker module 50 and the middle plate portion 112 are fixed with glue (such as hot melt glue), since the portion where the speaker module 50 is bonded to the middle plate portion 112 faces away from the back cover 13, it is not convenient to separate the speaker module 50 from the middle frame portion 11 by heating the hot melt glue to melt it into a liquid state. If the speaker module 50 is forcibly separated from the middle frame portion 11 by external force, it may cause damage to the speaker module 50. Therefore, compared to the fixing method using glue, the use of foam glue 60 to fix the speaker module 50 to the middle plate portion 112 is suitable for scenarios where the speaker module 50 needs to be removed from the middle frame portion 11, such as in the scenario of repairing electronic equipment, and can facilitate the separation of the speaker module 50 from the middle frame portion 11.

[0053] The speaker module 50 includes a housing and a speaker core housed within the housing. The speaker core is the core component for producing sound and includes a diaphragm that vibrates to produce sound. The housing provides a sound cavity for the speaker core, achieving the desired acoustic performance. For example, the speaker core and the housing form a front cavity 51 and a rear cavity. The structure of the housing, speaker core, and rear cavity are not shown in the figure.

[0054] The rear cavity is typically a closed chamber to prevent sound leakage. A sound outlet is provided in the area of the housing corresponding to the front cavity. This outlet communicates with the front cavity but not the rear cavity. The outlet is connected to the sound outlet 12 to form a sound channel. Thus, when the speaker core is operating, it causes the air in the front cavity to vibrate. This vibrating air is then channeled out through the sound channel, producing sound.

[0055] The speaker core is electrically connected to the signal processor via wires. The speaker core receives processed audio signals and vibrates to produce sound based on the received audio signals. The sound generated by the speaker core is transmitted to the sound output channel, where it converges and is then transmitted to the external environment through the sound outlet.

[0056] The front cavity 51 can make the sound produce a high-frequency cutoff frequency and a high-frequency peak to correct high-frequency noise. A good front cavity can improve the intermediate frequency, reduce high-frequency noise, reduce the extension of the high-frequency band, and improve the sound conversion efficiency. The rear cavity can prevent the low-frequency sound of the speaker module 50 from short-circuiting, so that the low-frequency sound is favorable and people feel that the sound is round. The design of the rear cavity is very important and directly affects the quality and size of the sound of electronic equipment. The volume of the front cavity should be as small as possible to form high-frequency resonance for the sound and make the sound clean; the volume of the rear cavity should be as large as possible, and the rear cavity needs to be sealed. In this way, the audio performance of the speaker module 50 can be guaranteed.

[0057] To reduce the thickness of the speaker module 50 and the z-direction space occupied by the speaker module 50 in the electronic device, the speaker module 50 can adopt an open cavity (hereinafter referred to as an open speaker). The open cavity can be formed in the front cavity 51, the rear cavity, or both. Different open speakers can produce different audio effects to suit different usage scenarios.

[0058] For example, when using an open-type speaker with an open front cavity 51 and a closed rear cavity, the open-type speaker is fixed to the middle frame 11, with the open front cavity 51 facing the middle plate 112 and the closed rear cavity facing the rear cover 13. The open front cavity 51 is sealed with the middle plate 112 to form an equivalent front cavity. When using an open-type speaker with a closed front cavity and an open rear cavity, the open-type speaker is fixed to the middle frame 11, with the closed front cavity 51 facing the middle plate 112 and fixed to the middle plate 112; the open rear cavity faces the rear cover 13, and the open rear cavity and the rear cover 13 are not sealed, and the open rear cavity forms an equivalent rear cavity with the entire internal cavity of the speaker.

[0059] Figure 3 yes Figure 1 Schematic diagram of the local structure of area B. Figure 3 The sealing structure of the speaker module 50 is shown, and the structure toward the rear cover 13 side, Figure 3 The back cover 13 is not shown.

[0060] like Figure 3 As shown, for an open speaker with an open front cavity and a closed rear cavity, the open speaker is sealed with a foam glue 60. Figure 2 Foam adhesive 60 is placed in the area of the middle plate 112 that secures the edges of the open speaker housing, and the foam adhesive 60 extends outward around the perimeter of the open speaker to enhance sealing. The open side housing of the open speaker is sealed to the middle plate 112 via foam adhesive 60, forming an equivalent front cavity for the open speaker.

[0061] See again Figure 2 Since the foam glue 60 itself has a certain thickness h 60 , causing the foam glue 60 to occupy the z-axis thickness space of the electronic device. In addition, the foam glue 60 is solid at room temperature and has a certain hardness, and is not easily deformed by force. When assembling the open speaker and the back cover 13, the open speaker will lift up the back cover 13. Therefore, in order to avoid the outer shell on the back cavity side of the open speaker from colliding with the back cover 13 during assembly, a certain gap must be reserved between the open speaker and the back cover 13 for avoidance. For example, the avoidance gap L1 is 0.15mm-2mm, and the avoidance gap L1 also occupies the z-axis thickness space of the electronic device.

[0062] As can be seen, for electronic devices with limited z-axis space, conventional open-front speaker solutions occupy a large amount of thickness (z-axis) space, which is not conducive to the development of lightweight and thin electronic devices. If the thickness of electronic devices is reduced, the open-front speaker solution may become unfeasible.

[0063] In order to solve the above technical problems, the embodiments of the present application provide a sound cavity structure and an electronic device.

[0064] Figure 4 This is a first structural diagram of the acoustic cavity structure provided in an embodiment of the present application; Figure 5 This is the second structural diagram of the acoustic cavity structure provided in the embodiment of the present application. Figure 4 The perspective of the structure shown is Figure 1 The viewing angle of the AA section is the same. Figure 4 and Figure 5 The perspective is different.

[0065] like Figure 4 and Figure 5 As shown, in some embodiments, the acoustic cavity structure may be located in the first body of the electronic device, and the acoustic cavity structure may include: a middle frame 100 , a rear shell 200 and a speaker 300 .

[0066] The rear cover 200 is located on one side of the middle frame 100 and is fixedly connected to the middle frame 100. For example, the middle frame 100 may be a middle frame of an electronic device, and the rear cover 200 may be a battery cover of the electronic device.

[0067] The middle frame 100 includes a middle plate 101, sidewalls 102, and a partition 103. The sidewalls 102 surround the edges of the middle plate 101, and the rear housing 200 is fixed to the sidewalls 102. The middle plate 101, sidewalls 102, and rear housing 200 form the interior of the device, which can house electronic components such as circuit boards, a controller, a signal processor, a camera module, a battery (not shown), and a speaker 300.

[0068] There can be multiple partitions 103, and multiple partitions 103 are located on the middle plate 101 in different splicing states to divide the entire machine cavity surrounded by the middle frame side walls 102 and the middle plate 101 into multiple placement areas (not shown in the figure).

[0069] Different placement areas are used to place different electronic devices. For example, the speaker 300 can be located in the placement area adjacent to the middle frame side wall 102, and the speaker 300 abuts between the middle frame side wall 102 and the partition 103; the placement area adjacent to the placement area where the speaker 300 is located can be used as a battery compartment 600 (as shown below). Figure 9 shown), for placing batteries.

[0070] The speaker 300 may be an open speaker with an open front cavity and a closed rear cavity. The speaker 300 is located between the middle frame 100 and the rear shell 200, and the speaker 300 may be fixed to the middle frame 100.

[0071] Figure 6 3 is a schematic structural diagram of a speaker 300 provided in an embodiment of the present application; Figure 7 yes Figure 6 Schematic diagram of the structure of the CC section.

[0072] like Figure 6 and Figure 7 As shown, in some embodiments, a speaker 300 may include a housing 302 and a core 303. The core 303 is the core component for generating external sound, and includes a diaphragm for vibrating and producing sound; the housing 302 is used to provide a sound cavity for the core 303 to achieve corresponding acoustic performance.

[0073] The housing 302 may include a housing bottom 3021 and a housing sidewall 3022 . The housing sidewall 3022 surrounds a portion of the edge of the housing bottom 3021 , so that the housing 302 forms a structure with openings at adjacent two ends.

[0074] The core 303 is placed in the shell 302 and is located in the middle position along the thickness direction of the shell 302, so that the upper surface of the core 303 is at a certain distance from the edge of the open end of the shell 302, and the lower surface of the core 303 is at a certain distance from the bottom 3021 of the shell. In this way, the core 303 divides the shell 302 into two parts, and the lower surface of the core 303, the bottom 3021 of the shell and part of the shell side wall 3022 form a closed structure as a rear sound cavity (not shown in the figure); the upper surface of the core 303 and the shell side wall 3022 on the open side form a groove 301, and the groove 301 is used to form an open front sound cavity. The groove 301 is a structure with openings on two adjacent sides. It should be noted that the "upper" and "lower" mentioned in this article are only based on Figure 6 For the status shown.

[0075] See again Figure 4 and Figure 5 , the speaker 300 is assembled to the middle frame 100 in an inverted form, with the rear sound cavity of the speaker 300 facing the middle plate 101 and the groove 301 facing the rear shell 200. The bottom 3021 of the shell body used to form the rear sound cavity is not fixed to the middle plate 101, and the structure of the bottom 3021 of the shell body is adapted to the structure of the middle plate 101. For example, if the middle plate 101 includes a stepped structure (not shown in the figure), the corresponding position of the bottom 3021 of the shell body is also a stepped structure (such as Figure 4 lower right corner structure).

[0076] An assembly gap L2 is defined between the housing bottom 3021 and the midplane 101. For example, assembly gap L2 may be 0.05 mm. Assembly gap L2 facilitates installation and removal of the loudspeaker 300 and does not excessively occupy the z-direction space of the acoustic cavity structure. In other embodiments, the midplane 101 may include a through hole 1011, and the housing bottom 3021 of the loudspeaker 300 may be embedded within the through hole 1011, further reducing the z-direction space occupied by the loudspeaker 300.

[0077] The housing sidewall 3022, which forms the recess 301, is bonded and sealed to the rear housing 200 using adhesive. This allows the recess 301 and the rear housing 200 to enclose a front acoustic chamber 304 of the speaker 300. This front acoustic chamber 304 allows sound to generate a high-frequency cutoff frequency and a high-frequency peak to correct for high-frequency noise. The front acoustic chamber 304 formed in this embodiment of the present application can enhance mid- and low-frequency sound, reduce high-frequency noise, reduce high-frequency extension, and improve sound conversion efficiency.

[0078] Figure 8 1 is a schematic structural diagram of the middle frame 100 and the rear shell 200 provided in an embodiment of the present application.

[0079] like Figure 8 As shown, in some embodiments, the middle frame side wall 102 may include a sound outlet 104 and a sealing surface 1022 .

[0080] The sound outlet holes 104 communicate with the inside and outside of the sound cavity structure. There may be multiple sound outlet holes 104 , which are spaced apart and distributed on the side walls 102 of the middle frame.

[0081] The sound hole 104 is inclined along the direction from the middle plate 101 to the rear shell 200 and toward the inside of the sound cavity structure. The axis of the sound hole 104 and the rear shell 200 have a first angle α1 toward the middle plate 101, and the first angle α1 can be an obtuse angle.

[0082] The first angle α1 is greater than 90° and less than 180°. For example, the first angle α1 can be 95°, 100°, 110°, 120°, 130°, 140°, 150°, 160°, or 170°. The first angle α1 is preferably greater than or equal to 120° and less than or equal to 170°. For example, the first angle α1 can be 120°, 130°, 140°, 150°, 160°, 163°, or 170°.

[0083] The end of the sound hole 104 facing the inner part of the sound cavity structure is adjacent to the rear shell 200. Figure 4The larger the first angle α1, the easier it is for the sound outlet 104 to communicate with the front sound cavity 304 of the speaker 300, forming a sound outlet channel. In this way, the sound generated by the core 303 of the speaker 300 when in operation is transmitted to the sound outlet channel. After the sound is concentrated in the sound outlet channel, it is transmitted to the external environment through the sound outlet 104, achieving sound diffusion.

[0084] The surface of the sound outlet 104 is smooth to prevent harsh sound. The end of the sound outlet 104 facing the interior of the acoustic cavity structure can be deburred to form a chamfer (not shown). This can stabilize the airflow to the sound outlet 104, thereby improving the audio performance of the acoustic cavity structure and preventing noise.

[0085] The sealing surface 1022 is located on a side of the middle frame side wall 102 adjacent to the outer shell 200 relative to the sound outlet 104 . The sealing surface 1022 faces the rear shell 200 . A gap is provided between the sealing surface 1022 and the rear shell 200 to facilitate installation of the speaker 300 .

[0086] Figure 9 This is a third structural diagram of the acoustic cavity structure provided in an embodiment of the present application; Figure 10 yes Figure 9 Schematic diagram of the local structure of the D area in the middle. Figure 9 and Figure 10 Showing the structure toward the rear case 200 side, Figure 9 and Figure 10 The rear case 200 is not shown.

[0087] like Figure 9 and Figure 10 As shown, in some embodiments, the speaker 300, the sealing surface 1022 and the rear housing 200 are bonded and sealed by an adhesive layer 500. For example, the adhesive layer 500 can be liquid glue, such as hot melt glue, which can be deformed under force.

[0088] The sealing surface 1022 and the edge of the groove 301 can be coplanar, where the edge of the groove can be the edge of the housing sidewall 3022. The adhesive layer 500 is continuously formed on the sealing surface 1022 and the edge of the housing sidewall 3022 of the groove 301. When assembling the rear housing 200, the rear housing 200 is bonded to the sealing surface 1022 and the edge of the housing sidewall 3022 via the adhesive layer 500. The rear housing 200, the groove 301 of the speaker 300, and the middle frame sidewall 102 form the front sound cavity 304 of the speaker 300. This ensures the sealing and stability of the rear housing 200 and the middle frame sidewall 102, ensuring a sealed front sound cavity 304.

[0089] The sealing surface 1022 and the groove edge of the groove 301 may not be coplanar. In this way, the fluidity of the adhesive layer 500 can still be used to eliminate the height difference between the sealing surface 1022 and the groove edge of the groove 301, thereby ensuring sealing and bonding stability.

[0090] Compared to Figure 2 The speaker module 50 shown is fixed to the middle frame portion 11 via a foam glue 60. In the embodiment of the present application, glue is used to bond the groove 301 to the rear shell 200. Since the glue is liquid, it can deform under force. While having the same or better bonding and sealing properties, the thickness of the glue is less than the thickness of the foam glue 60, which can reduce the space occupied in the z direction. In addition, since the portion of the speaker 300 facing the rear shell 200 is the groove 301, the side wall 3022 of the shell can easily press the glue apart during bonding, and there is no situation where the rear shell 200 is lifted. Therefore, there is no need to reserve a clearance L1 between the groove 301 and the rear shell 200, which can further reduce the space occupied in the z direction. In addition, the glue layer 500 faces the rear shell 200, which can be easily melted into a fluid state by heating during subsequent disassembly to separate the rear shell 200 from the speaker.

[0091] The acoustic cavity structure provided in the embodiment of the present application inverts the speaker 300, with the open front acoustic cavity facing the rear shell 200, and uses the shell side wall 3022 on the side of the groove 301 of the rear shell 200 and the speaker 300 to make a glue seal. Only an assembly gap L2 needs to be reserved between the speaker 300 and the middle frame 100. The acoustic cavity structure can save the thickness difference between the foam glue 60 and the glue in the z-direction space, as well as avoid the gap L1. For example, the acoustic cavity structure can save at least 0.2mm in the z-direction space. In this way, not only can the speaker solution with an open front acoustic cavity be realized, but the overall thickness of the acoustic cavity structure can also be reduced, which is suitable for electronic devices with limited z-direction space; the acoustic cavity structure will not occupy too much z-direction space of the electronic device, which is conducive to the development of lightweight and thin electronic devices.

[0092] See again Figures 4 to 7 As shown, in some embodiments, the end of the speaker 300 facing the middle frame side wall 102 may include a first inclined surface 305 , and the first inclined surface 305 may be regarded as the outer surface of the rear sound cavity of the speaker 300 .

[0093] The first inclined surface 305 is inclined along the direction from the bottom 3021 of the housing to the groove 301, and is inclined toward the interior of the speaker 300. When the speaker 300 is mounted on the middle frame 100 in an inverted configuration, the first inclined surface 305 is inclined along the direction from the rear housing 200 to the middle frame 100, and is inclined toward the middle frame sidewall 102.

[0094] A second angle α2 is formed between the first inclined surface 305 and the housing bottom 3021 , and the second angle α2 may be an acute angle.

[0095] The second angle α2 is greater than 0° and less than 90°. For example, the second angle α2 can be 5°, 10°, 20°, 120°, 30°, 40°, 50°, 60°, 70°, or 80°. The second angle α2 is preferably greater than or equal to 50° and less than or equal to 80°. For example, the second angle α2 can be preferably 50°, 60°, 70°, or 80°.

[0096] The first inclined surface 305 and the rear housing 200 form a third angle toward the middle plate 101. The third angle can be an obtuse angle and is complementary to the second angle α2. The details are omitted here. The first inclined surface 305 and the sound outlet 104 have the same inclination direction, but the inclination angle can be different.

[0097] Figure 11 1 is a schematic structural diagram of the middle frame 100 provided in an embodiment of the present application; Figure 12 yes Figure 11 Schematic diagram of the local structure of area E in the middle.

[0098] like Figure 11 and Figure 12 As shown, the middle frame side wall 102 may include a second inclined surface 1021, and the second inclined surface 1021 faces the inside of the sound cavity structure.

[0099] The second inclined surface 1021 can be a semi-annular structure. It extends from one side of the sound outlet 104 toward the middle plate 101 (the z-axis), then extends along the arrangement direction of the multiple sound outlets 104 (the x-axis), and finally extends along the z-axis to the other side of the sound outlet 104. The second inclined surface 1021 is connected to the sealing surface 1022 at an angle. The other end of the second inclined surface 1021 is connected to the surface of the middle plate 101 facing the rear housing 200. The sound outlet 104 is located between the sealing surface 1022 and the second inclined surface 1021.

[0100] Combine Figure 8 As shown, the second inclined surface 1021 is inclined from the middle plate 101 to the rear housing 200 and is inclined toward the partition 103. A fourth angle α4 is formed between the second inclined surface 1021 and the middle plate 101 toward the rear housing 200. The fourth angle α4 may be an acute angle.

[0101] The second inclined surface 1021 has the same inclination angle as the first inclined surface 305, and the fourth angle α4 is equal to the second angle α2. Figure 4 The second inclined surface 1021 abuts against the first inclined surface 305 so that the second inclined surface 1021 and the first inclined surface 305 are seamlessly fitted together, thereby improving the sealing effect between the speaker 300 and the middle frame side wall 102.

[0102] In this way, the left side of the speaker 300 is fixed to the middle frame side wall 102 using the inclined surface. This not only ensures a tight seal between the speaker 300 and the middle frame side wall 102, but also prevents the speaker 300 from sliding toward the middle plate 101 along the z-axis, thereby achieving z-fixation of the speaker 300. Furthermore, this saves space for two screws along the x-axis on the sealing inclined surfaces (the second inclined surface 1021 and the first inclined surface 305). No screws are required to secure the left side of the speaker 300 to the middle plate 101, increasing the volume of the sound channel and improving the audio quality.

[0103] The right side of the speaker 300 abuts against the partition 103, and there may be an assembly gap L2 between the right side of the speaker 300 and the partition 103 to facilitate the assembly of the speaker 300. To improve stability, the right side of the speaker 300 can be fixed to the middle plate 101 by screws (not shown in the figure) near the partition 103. It should be noted that the "left" and "right" directions in this article are based on Figure 4 The position is determined by the state shown and is not intended to limit the specific position.

[0104] In some embodiments, the second inclined surface 1021 protrudes toward the interior of the acoustic cavity structure relative to the distal end of the sound hole 104, so that the surface where the distal end of the sound hole 104 is located and the surface of the protruding portion of the middle frame side wall 102 used to form the second inclined surface 1021 form a cavity 105. The cavity 105 connects between the sound hole 104 and the front acoustic cavity 304, forming a sound channel. The cavity 105 is used to increase the volume of the open front acoustic cavity 304 of the speaker 300 to improve audio performance. The distal end of the sound hole 104 is the end of the sound hole 104 facing the interior of the acoustic cavity structure.

[0105] In this way, when the left side of the speaker 300 is fixed to the middle frame side wall 102 with a bevel, the two screw spaces on the left and right sides of the saved sealing bevel along the x-axis direction are used to increase the volume of the open front sound cavity 304, thereby increasing the volume of the sound output channel and improving the audio effect.

[0106] In this embodiment of the present application, along the y-axis, the speaker 300 abuts between the middle frame side wall 102 and the partition 103. The left side of the speaker 300 is fixed to the middle frame side wall 102 using an inclined surface, while the right side abuts the partition 103 (the assembly gap L2 is small and can be ignored). In this way, the speaker 300 is assembled with the middle frame 100 in a clean-fit manner, and the speaker 300 and the middle frame 100 are pressed together along the y-axis, which can ensure the sealing effect of the left sealing surface and the stability of the speaker 300 and the middle frame 100.

[0107] See again Figure 12 In some embodiments, the acoustic cavity structure may further include: a sealing rib 400 , which is located on the second inclined surface 1021 .

[0108] To adapt to the structure of the second inclined surface 1021, the sealing rib 400 is also a semi-annular structure, which can achieve semi-annular sealing. The sealing rib 400 can be made of a material with elasticity and deformability, such as rubber.

[0109] When the speaker 300 is in contact with the middle frame side wall 102, the sealing rib 400 is located between the first inclined surface 305 and the second inclined surface 1021. The speaker 300 and the middle frame side wall 102 apply pressure to the sealing rib 400. The sealing rib 400 is elastically deformed by the pressure and applies pressure in the opposite direction to the first inclined surface 305 and the second inclined surface 1021 to improve the planar sealing effect of the speaker 300 and the middle frame side wall 102, and prevent liquid from the external environment from entering the open front sound cavity 304 of the speaker 300 through the sound outlet 104, and then entering the inner cavity of the entire machine.

[0110] In some embodiments, the acoustic cavity structure may further include a sealing dustproof member (not shown), which is located between the first inclined surface 305 and the second inclined surface 1021. The relative positions of the sealing dustproof member and the sealing rib 400 are not limited; both are located between the first inclined surface 305 and the second inclined surface 1021.

[0111] The sealing dustproof component may include a substrate, a dustproof net, and a first adhesive layer stacked in sequence. The substrate serves as the framework of the sealing dustproof component, the dustproof net is used to prevent dust, and the first adhesive layer is used to connect the sealing dustproof component to other structural components. For example, the substrate can be made of a soft adhesive such as soft silicone or rubber, the dustproof net can be made of wire mesh or woven mesh, and the first adhesive layer can be made of a strong adhesive such as adhesive backing, hot melt adhesive, or ultraviolet (UV) adhesive.

[0112] The area of the base plate corresponding to the dust screen has a hollow hole to expose the dust screen so that the dust screen can play its dustproof role. The base plate and the dust screen can also be bonded by another adhesive layer to improve stability.

[0113] Combine Figure 4 The size of the sealing dustproof part is the same as the outer size of the first inclined surface 305 and the second inclined surface 1021, so that the sealing dustproof part covers the cavity 105 and seals the front sound cavity 304. The sealing dustproof part is used to seal and dustproof the speaker 300. The sealing dustproof part can block the passage of dust or liquid, but allow sound waves to pass through. In this way, the sealing dustproof part can not only achieve sealing between the speaker 300 and the side wall 102 of the middle frame, but also prevent dust from the external environment from entering the open front sound cavity 304 of the speaker 300 through the sound outlet 104, and then entering the inner cavity of the whole machine; it can also enable the sound generated by the speaker 300 to be transmitted to the sound outlet 104 through the sealing dustproof part, and then diffuse to the outside, without affecting the audio performance.

[0114] In this embodiment of the present application, to ensure the sound reproduction function of the acoustic cavity structure, a sealed dustproof member is used to seal the open front acoustic cavity 304 of the speaker 300. Furthermore, a sealing rib 400 is used to press the front acoustic cavity 304 against the sound outlet 104 to achieve a planar seal. This prevents external dust or liquid from entering the electronic device through the sound outlet 104 and affecting the electronic components on the middle frame 100.

[0115] Figure 13 This is the fourth structural diagram of the acoustic cavity structure provided in the embodiment of the present application.

[0116] like Figure 13 As shown, in some embodiments, the speaker 300 can also be an open speaker with an open front sound cavity and an open rear sound cavity (not shown in the figure). The open speaker includes a shell 302 and a core 303. Figure 6 and Figure 7 The difference between the loudspeaker 300 with an open front sound cavity and a closed rear sound cavity is that the housing 302 is a ring structure with both upper and lower opposite ends being open.

[0117] The core 303 is placed within the shell 302, positioned midway along the thickness of the shell 302. The upper surface of the core 303 is spaced a certain distance from the edge of one open end of the shell 302, and the lower surface of the core 303 is spaced a certain distance from the opposite open end of the shell 302. Thus, the core 303 divides the shell 302 into two parts. The upper surface of the core 303 forms a groove 301 with the shell 302 (open on one side), which forms an open front sound cavity 304. The lower surface of the core 303 forms a second groove with the shell 302 (open on the opposite side), which forms an open rear sound cavity 306.

[0118] The open speaker is located between the middle frame 100 and the rear housing 200, with the groove 301 facing the rear housing 200 and the second groove facing the middle plate 101. One end of the housing 302 is bonded to the rear housing 200 via an adhesive layer 500, thereby forming a front acoustic cavity 304 of the open speaker with the groove 301, the sealing surface 1022, and the rear housing 200. The details of forming the front acoustic cavity 304 can be found in the previous embodiments and are not detailed here.

[0119] The other end of the shell 302 is bonded to the middle plate 101 by foam glue (not shown in the figure). The middle plate 101 does not include a through hole 1011, so that the second groove is sealed by the middle plate 101, and then the rear sound cavity 306 of the open speaker is formed by the second groove and the middle plate 101.

[0120] In this way, the acoustic cavity structure provided by the embodiments of the present application can simultaneously eliminate the shell wall thickness originally used to form the front and rear acoustic cavities, thereby further reducing the z-axis thickness of the open-type speaker. The thickness of the foam adhesive is less than the thickness of the shell wall used to form the rear acoustic cavity, which can reduce the thickness of the acoustic cavity structure as a whole, and the foam adhesive can facilitate the subsequent disassembly of the open-type speaker. The reduced thickness of the acoustic cavity structure can further achieve the lightweight and thinness of electronic devices while realizing the acoustic cavity.

[0121] It should be noted that the manner in which the open speaker is fixed to the middle frame 100 and other structural characteristics may refer to the contents of any of the aforementioned embodiments and will not be described in detail here.

[0122] Figure 14 This is a first cross-sectional structural diagram of an electronic device provided in an embodiment of the present application.

[0123] like Figure 14 As shown, the electronic device includes: a display module 700 and the acoustic cavity structure provided by any of the aforementioned embodiments. The display module 700 is used to form the display screen of the electronic device. The display module 700 is located on the side of the middle frame 100 facing away from the rear housing 200. The display module 700 can be fixed to the middle frame side wall 102 and close to the middle plate 101.

[0124] Figure 15 This is a second cross-sectional structural diagram of the electronic device provided in an embodiment of the present application.

[0125] like Figure 15 As shown, in some embodiments, the speaker 300 can also adopt an open speaker with an open front sound cavity and an open rear sound cavity (not shown in the figure). The structure of the open speaker can refer to Figure 13 The content shown is not repeated here.

[0126] The open speaker is located between the middle frame 100 and the rear housing 200, with the groove 301 facing the rear housing 200 and the second groove facing the middle plate 101. One end of the housing 302 is bonded to the rear housing 200 via an adhesive layer 500, thereby forming a front acoustic cavity 304 of the open speaker with the groove 301, the sealing surface 1022, and the rear housing 200. The details of forming the front acoustic cavity 304 can be found in the previous embodiments and are not detailed here.

[0127] The middle plate 101 includes a through hole 1011, the width of the through hole 1011 along the y direction is smaller than the width of the second groove along the y direction. The shell 302 is snapped onto the edge of the through hole 1011, so that the second groove is connected to the through hole 1011. The other end of the shell 302 is bonded to the middle plate 101 by foam glue (not shown in the figure), and the display module 700 is located on the other side of the middle plate 101 and bonded to the middle plate 101. In this way, the second groove can be sealed by the display module 700, and the rear sound cavity 306 of the open speaker is formed by the display module 700, the through hole 1011 and the second groove.

[0128] In this way, the acoustic cavity structure provided by the embodiments of the present application can simultaneously eliminate the shell wall thickness originally used to form the front and rear acoustic cavities, thereby further reducing the z-axis thickness of the open-type speaker. The thickness of the foam adhesive is less than the thickness of the shell wall used to form the rear acoustic cavity, which can reduce the thickness of the acoustic cavity structure as a whole, and the foam adhesive can facilitate the subsequent disassembly of the open-type speaker. The reduced thickness of the acoustic cavity structure can further achieve the lightweight and thinness of electronic devices while realizing the acoustic cavity.

[0129] It should be noted that the manner in which the open speaker is fixed to the middle frame 100 and other structural characteristics may refer to the contents of any of the aforementioned embodiments and will not be described in detail here.

[0130] The electronic device provided in the embodiment of the present application adopts an acoustic cavity structure which can reduce the size of the z-direction space occupied by the electronic device, thereby achieving the lightweight and thin development of the electronic device.

[0131] It should be noted that those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, and the true scope of this application is indicated by the following claims.

[0132] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A sound cavity structure, characterized in that: include: Middle frame (100); A rear shell (200), located on one side of the middle frame (100); A speaker (300) is located between the middle frame (100) and the rear shell (200), wherein the side of the speaker (300) facing the rear shell (200) comprises a groove (301), wherein the groove (301) and the rear shell (200) form a front sound cavity of the speaker (300), and the front sound cavity is used to correct high-frequency noise.

2. The acoustic cavity structure according to claim 1, characterized in that: The middle frame (100) comprises a middle plate (101), a middle frame side wall (102) and a partition (103); The middle frame side walls (102) surround the edge of the middle plate (101), the partition (103) is located on the middle plate (101), and the middle plate (101), the middle frame side walls (102) and the partition (103) form a placement area; The loudspeaker (300) is located in the placement area and abuts between the middle frame side wall (102) and the partition (103).

3. The acoustic cavity structure according to claim 2, characterized in that: One end of the speaker (300) facing the middle frame side wall (102) includes a first inclined surface (305); The first inclined surface (305) is inclined along the direction from the rear shell (200) to the middle frame (100) and toward the middle frame side wall (102).

4. The acoustic cavity structure according to claim 3, characterized in that: The middle frame side wall (102) comprises a second inclined surface (1021) facing the speaker (300); The second inclined surface (1021) is inclined along the direction from the middle frame (100) to the rear shell (200) and toward the partition (103); The second inclined surface (1021) has the same inclination angle as the first inclined surface (305), and the second inclined surface (1021) abuts against the first inclined surface (305).

5. The acoustic cavity structure according to claim 4, characterized in that: Also included: a sealing rib (400); The sealing rib (400) is located between the first inclined surface (305) and the second inclined surface (1021) to seal the loudspeaker (300) and the middle frame side wall (102).

6. The acoustic cavity structure according to claim 2, characterized in that: The middle frame side wall (102) comprises a sealing surface (1022) facing the rear shell (200); The sealing surface (1022) is coplanar with the groove body edge of the groove (301).

7. The acoustic cavity structure according to claim 6, characterized in that: Also included: a glue layer (500); The adhesive layer (500) is continuously formed on the sealing surface (1022) and the edge of the groove body of the groove (301), and is bonded to the rear shell (200) to enclose the front sound cavity of the speaker (300).

8. The acoustic cavity structure according to claim 2, characterized in that: The middle frame side wall (102) includes a sound outlet hole (104); The sound outlet hole (104) is located between the sealing surface (1022) and the second inclined surface (1021); The sound outlet hole (104) is in communication with the front sound cavity of the speaker (300).

9. The acoustic cavity structure according to claim 8, characterized in that: The sound outlet (104) is inclined in the direction from the middle frame (100) to the rear shell (200), and one end of the sound outlet (104) facing the interior of the sound cavity structure is adjacent to the rear shell (200) so as to be connected to the front sound cavity of the speaker (300).

10. An electronic device, characterized in that: include: A display module, and an acoustic cavity structure according to any one of claims 1 to 9; the display module is located on a side of the middle frame (100) facing away from the rear shell (200).

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