Patent Description:
Document <CIT> discloses a loudspeaker module. The loudspeaker module comprises a shell and a loudspeaker monomer; and the loudspeaker monomer is contained in the shell, and has a vibrating diaphragm.

Document <CIT> discloses a loudspeaker box. The loudspeaker box comprises an upper cover, a lower cover and a single sound production unit. The lower cover and the upper cover enclose an accommodating space. The single sound production unit is arranged in the accommodating space.

Document <CIT> discloses a speaker module and electronic equipment. The module comprises a shell and a sounding device located in an inner cavity of the shell.

Existing terminal products such as a mobile phone and a tablet computer has a high waterproof level, and overall internal air tightness is good. Atmospheric pressure of a rear sound cavity of a speaker module easily changes due to factors such as holding a terminal by a user. Consequently, a location of a diaphragm in the speaker module is shifted, and sound quality of the speaker module is affected.

An objective of this application is to provide a speaker module and an electronic device, to balance atmospheric pressure of front and rear sound cavities in the speaker module and improve sound quality of the speaker module.

The above problems are solved by the subject-matter according to the independent claim. A speaker module in this application includes a first enclosure, a speaker core, and a waterproof breathable film. The first enclosure is provided with an accommodating groove, the speaker core is mounted on the accommodating groove, the speaker core includes a sound diaphragm, a front sound cavity is formed between the sound diaphragm and the first enclosure, a rear sound cavity is on a side that is of the sound diaphragm, and the side that is of the sound diaphragm is away from the front sound cavity.

The first enclosure is further provided with a resonant groove, a bottom of the resonant groove is provided with a communicating hole, the resonant groove communicates with the front sound cavity through the communicating hole, and the waterproof breathable film covers an opening that is of the resonant groove and that faces the rear sound cavity, to isolate the resonant groove from the rear sound cavity.

The waterproof breathable film covers the opening that is of the resonant groove and that faces the rear sound cavity, and the waterproof breathable film and the resonant groove form, through enclosing, a resonant cavity that communicates with the front sound cavity. Additionally, the first enclosure is further provided with a groove, an opening of the groove is located on a bottom wall surface of the accommodating groove; the sound diaphragm comprises a dome and a diaphragm bearing the dome, and the dome directly faces the groove; the dome is in a rectangular plate shape; and the diaphragm is in a rectangular ring shape.

Compared with an existing speaker module, in the speaker module in this application, the waterproof breathable film separates the front sound cavity and the rear sound cavity. When the speaker module does not work, air may flow between the front sound cavity and the rear sound cavity through the waterproof breathable film. In this case, the rear sound cavity and the front sound cavity are connected, atmospheric pressure between the front sound cavity and the rear sound cavity is always balanced, and a position of the sound diaphragm in the speaker module is not shifted. Compared with sound quality of the existing speaker module, sound quality of the speaker module in this application is improved.

When the speaker module works, the sound diaphragm of the speaker core drives air in the front sound cavity and the rear sound cavity to vibrate. An air flow speed generated when the air in the front sound cavity and the rear sound cavity vibrates is far greater than air permeability of the waterproof breathable film. The waterproof breathable film approximately isolates the front sound cavity from the rear sound cavity. This can effectively prevent air flowing between the front sound cavity and the rear sound cavity from affecting a volume of a sound made by the speaker module. In this case, the resonant cavity communicates with only the front sound cavity, and the resonant cavity and the front sound cavity form a Helmholtz resonator (Helmholtz resonators) having a resonance frequency. According to a Helmholtz resonance (Helmholtz resonance) principle, the resonant cavity forms an anti-resonance peak at a high-frequency resonance peak of the front sound cavity, to weaken a peak value of the speaker module at the high-frequency resonance peak. This effectively reduces the peak value of the high-frequency resonance peak and high-frequency sensitivity, improves flatness of a high-frequency response of the speaker module, avoids phenomena of high-frequency sharpness and a heavy labiodental sound of the speaker module, and improves sound quality of the speaker module.

The first enclosure includes a bottom wall and a first side wall connected to the bottom wall, and the bottom wall and the first side wall form the accommodating groove through enclosing.

The first enclosure further includes a second side wall connected to the bottom wall, the second side wall is connected to the first side wall, and the second side wall and the bottom wall form the resonant groove through enclosing.

The speaker core is a moving coil speaker core or a piezoelectric speaker core.

In an implementation, the first enclosure is provided with a sound outlet hole, and the sound outlet hole connects the front sound cavity and the outside of the speaker module, so that when the speaker core vibrates, a sound made by the front sound cavity is transmitted to the outside of the speaker module through the sound outlet hole. In this way, the speaker module makes a sound.

In an implementation, a ratio of a volume of the resonant groove to a volume of the communicating hole is between <NUM> and <NUM>, to ensure that the volume of the resonant groove is large enough to form the resonant cavity having a volume with the waterproof breathable film, so that the resonant cavity can reduce loudness at a high frequency when the speaker module works, reduce harshness caused by high-frequency resonance, and improve acoustic performance of the speaker module.

In an implementation, air permeability of the waterproof breathable film is between <NUM>/min and <NUM>/min. That is, in one minute, <NUM> to <NUM> air is allowed to pass through the waterproof breathable film. When the speaker module does not work, an air flow rate between the front sound cavity and the rear sound cavity is between <NUM>/min and <NUM>/min, to quickly and effectively balance atmospheric pressure between the front sound cavity and the rear sound cavity.

In an implementation, an opening through which the communicating hole communicates the resonant groove is partially located on a bottom wall surface of the resonant groove, and is partially located on a side wall surface of the resonant groove. That is, the opening through which the communicating hole communicates with the resonant groove is partially located on a surface that is of the bottom wall and that faces the resonant groove, and is partially located on a surface that is of the second side wall and that faces the resonant groove, to ensure a sufficient volume of the communicating hole and a proper air flow rate between the resonant groove and the front sound cavity.

The first enclosure is further provided with a groove, and an opening of the groove is located on a bottom wall surface of the accommodating groove. In other words, the opening of the groove is located on a surface that is of the bottom wall and that faces the accommodating groove, and the groove is concave from the bottom wall surface of the accommodating groove to a direction away from the opening of the accommodating groove. The sound diaphragm includes a dome and a diaphragm bearing the dome. The dome directly faces the groove, to increase vibration space between the dome and the first enclosure, and increase utilization of space between a surround part of the diaphragm and the first enclosure, that is, increase utilization of space between the surround part and the bottom wall surface of the accommodating groove. This helps increase vibration amplitude of the sound diaphragm and improve audio performance of a sound made by the speaker module.

The dome directly facing the groove means that an orthographic projection of the dome on the bottom wall surface of the accommodating groove is located in the opening of the groove. That is, when the sound diaphragm vibrates, the dome may partially or completely extend into the groove.

In an implementation, the diaphragm includes a first fastening part bearing the dome and the surround part connected to the first fastening part. A distance between the dome and a bottom wall surface of the groove is equal to or greater than a distance between the surround part and the bottom wall surface of the accommodating groove, so that when vibration space between the dome and the first enclosure is fully used, vibration space between the surround part and the first enclosure can also be fully used. This helps increase vibration amplitude of the sound diaphragm, and improve audio performance of a sound made by the speaker module.

In an implementation, an opening of the sound outlet hole is located on the bottom wall surface of the groove, and the sound outlet hole extends from the bottom wall surface of the groove to a direction away from the opening of the groove, so that a sound made by the front sound cavity when the speaker core works is directly transmitted to the outside of the speaker module through the sound outlet hole. A sound guide pipe does not need to be designed to transmit a sound generated by the front sound cavity to the outside of the speaker module. This helps improve sound quality of the speaker module, and improve acoustic performance of the speaker module.

In an implementation, the speaker module further includes a second enclosure. The second enclosure covers the first enclosure, and forms a sound cavity with the first enclosure through enclosing. The speaker core is located between the first enclosure and the second enclosure. The rear sound cavity is formed between the sound diaphragm and the second enclosure.

Compared with a rear sound cavity formed between the sound diaphragm and another component outside the speaker module, in the speaker module in this implementation, a sealing level of the rear sound cavity formed between the sound diaphragm and the second enclosure is higher, to ensure effective sealing of the rear sound cavity, and improve sound quality of the speaker module.

In the speaker module in this implementation, the rear sound cavity is connected to the front sound cavity through the waterproof breathable film only when the speaker module does not work. Atmospheric pressure outside the speaker module does not affect atmospheric pressure in the rear sound cavity, and does not affect atmospheric pressure balance between the front sound cavity and the rear sound cavity. Therefore, a position of the sound diaphragm in the speaker module is not shifted, and normal working of the speaker module is not affected. This helps improve sound quality of the speaker module. In addition, the second enclosure and the first enclosure form a modular structure. The second enclosure and the first enclosure can not only fully protect the speaker core located between the second enclosure and the first enclosure, but also help simplify assembly of the speaker module and other components.

An example further provides a speaker module. The speaker module includes a first enclosure and a speaker module. The first enclosure is provided with an accommodating groove, the speaker core is mounted on the accommodating groove, the speaker module core includes a sound diaphragm, a front sound cavity is formed between the sound diaphragm and the first enclosure, and a rear sound cavity is on a side that is of the sound diaphragm and that is away from the front sound cavity.

The first enclosure is further provided with a groove, and an opening of the groove is located on a bottom wall surface of the accommodating groove. The sound diaphragm includes a dome and a diaphragm bearing the dome. The dome directly faces the groove, to increase vibration space between the dome and the first enclosure, and increase utilization of space between a surround part of the diaphragm and the first enclosure, that is, increase utilization of space between the surround part and the bottom wall surface of the accommodating groove. This helps increase vibration amplitude of the sound diaphragm and improve audio performance of a sound made by the speaker module.

An electronic device in this application includes a housing and any one of the foregoing speaker modules, and the speaker module is accommodated in the housing.

In the electronic device in this application, because sound quality of the speaker module is good, sound quality of the electronic device is good.

The housing is provided with a speaker hole. The speaker hole connects the sound outlet hole of the speaker module and the outside of the electronic device. When the speaker core works, a sound of the front sound cavity is transmitted to the outside of the electronic device through the sound outlet hole and the speaker hole in sequence, so that the electronic device makes a sound.

In an implementation, the housing includes an enclosure and a screen. The screen is mounted on the enclosure, and forms an overall inner cavity with the enclosure. To be specific, inside the housing, the speaker hole is disposed on the enclosure and is used as a loudspeaker hole. That is, the speaker module is used by the electronic device for making a sound by a speaker. Alternatively, the speaker hole is disposed on the screen and is used as a receiver hole. That is, the speaker module is used by the electronic device for making a sound by a receiver.

In an implementation, the housing includes a mounting surface, the housing is provided with a mounting groove, an opening of the mounting groove is located on the mounting surface, and the first enclosure is partially accommodated in the mounting groove. A part that is of the first enclosure and that forms the groove is accommodated in the mounting groove, to increase vibration space between the dome and the first enclosure, increase vibration amplitude of the sound diaphragm, and improve audio performance of the electronic device without increasing a thickness of the electronic device.

In an implementation, the electronic device further includes a support, the support is accommodated in the housing, the support includes an assembly surface, the support is provided with an assembly groove, an opening of the assembly groove is located on the assembly surface, and the first enclosure is partially accommodated in the assembly groove. A part that is of the first enclosure and that forms the groove is accommodated in the assembly groove, to increase vibration space between the dome and the first enclosure, increase vibration amplitude of the sound diaphragm, and improve audio performance of the electronic device without increasing a thickness of the electronic device.

In an implementation, the assembly groove penetrates through the support in a thickness direction of the support, and communicates with the speaker hole of the housing.

In an implementation, the assembly surface partially protrudes to form a limiting frame, and the limiting frame is disposed around the assembly groove and abuts against a circumferential surface of the speaker module, to assist in fastening the speaker module and improve assembly stability of the speaker module in the housing.

To describe technical solutions in embodiments of this application or in the background more clearly, the following describes the accompanying drawings used in embodiments of this application or in the background.

Refer to <FIG> is a schematic diagram of a structure of an electronic device <NUM> according to an embodiment of this application.

The electronic device <NUM> may be a product having a sound emitting function, such as a mobile phone, a tablet computer, a camera, a multimedia player, an e-book reader, a personal computer, a notebook computer, a vehicle-mounted device, a wearable device, AR (Augmented Reality, augmented Reality) glasses, an AR helmet, VR (Virtual Reality, virtual reality) glasses, or a VR helmet. In the embodiment shown in <FIG>, an example in which the electronic device <NUM> is the mobile phone is used for description.

The electronic device <NUM> includes a housing <NUM>, a mainboard <NUM>, and a speaker module <NUM>. The housing <NUM> includes an enclosure <NUM> and a screen <NUM>. The enclosure <NUM> is provided with a speaker hole <NUM>. The screen <NUM> is mounted on the enclosure <NUM>, and forms, with the enclosure <NUM>, an overall inner cavity (not shown in the figure), that is, an interior of the housing <NUM>. Both the mainboard <NUM> and the speaker module <NUM> are accommodated in the overall inner cavity. The speaker module <NUM> is electrically connected to the mainboard <NUM>, receives an audio signal transmitted by the mainboard <NUM>, and vibrates to make a sound based on the received audio signal. The sound is diffused to an external environment through the speaker hole <NUM>, so that the electronic device <NUM> makes a sound. The speaker hole <NUM> is a loudspeaker hole. That is, the speaker module <NUM> is used by the electronic device <NUM> to make a sound by using a speaker.

<FIG> is a schematic diagram of a structure of the enclosure <NUM> in the electronic device <NUM> shown in <FIG>.

The enclosure <NUM> includes a frame <NUM> and a rear cover <NUM>. In this embodiment, the speaker hole <NUM> is disposed on the frame <NUM>. Specifically, the frame <NUM> includes a top surface <NUM>, and an inner surface <NUM> and an outer surface <NUM> that are connected to two sides of the top surface <NUM>. That is, the top surface <NUM> is connected between the inner surface <NUM> and the outer surface. The inner surface <NUM> and the outer surface <NUM> are disposed back to back. An opening of the speaker hole <NUM> is located on the outer surface <NUM>. The speaker hole <NUM> extends from the outer surface <NUM> to the inner surface <NUM>, and penetrates through the inner surface <NUM>. It should be noted that, in another embodiment, the speaker hole <NUM> may also be disposed on the rear cover <NUM>. It should be understood that a shape of the speaker hole <NUM> is not limited to the squares shown in <FIG>, and may also be a cylinder, a strip, or a hole.

In an implementation, the frame <NUM> is roughly of a square frame structure. The frame <NUM> includes an upper frame <NUM> and a lower frame <NUM> that are disposed opposite to each other, and the speaker hole <NUM> is disposed on the lower frame <NUM>. When a user uses the electronic device <NUM>, the upper frame <NUM> is placed approximately upward, and the lower frame <NUM> is placed approximately downward.

The rear cover <NUM> is located on a side that is of the frame <NUM> and that is away from the top surface <NUM>. The rear cover <NUM> includes a mounting surface <NUM> that faces a same direction as the top surface <NUM>. The rear cover <NUM> and the frame <NUM> are integrally formed, to improve stability of the structure of the electronic device <NUM>. In this case, the frame <NUM> and the rear cover <NUM> may be made of a metal material. It may be understood that the rear cover <NUM> may also be detachably mounted on the frame <NUM>, to facilitate maintenance and replacement of a component such as a battery, a memory card, or a camera in the electronic device <NUM>. In this case, the frame <NUM> may be made of a metal alloy material such as titanium alloy or aluminum magnesium alloy. The rear cover <NUM> may be made of engineering plastic such as PC (polycarbonate, Polycarbonate) or ABS (acrylonitrile butadiene styrene copolymers, Acrylonitrile Butadiene Styrene copolymers), or metal alloy such as titanium alloy or aluminum-magnesium alloy.

In an implementation, the enclosure <NUM> may further include a middle plate. The middle plate is of a platelike structure. The middle plate may be formed on the frame <NUM> through an injection molding process, to form a middle frame of an integrated structure with the frame <NUM>. In this case, the middle plate and the frame <NUM> are integrated, and this helps improve overall strength of the electronic device <NUM>.

Refer to <FIG>. The screen <NUM> is located on a side that is of the frame <NUM> and that is away from the rear cover <NUM>. When the user uses the electronic device <NUM>, the screen <NUM> is placed toward the user, and the rear cover <NUM> is placed away from the user. Specifically, the screen <NUM> is mounted on the mounting surface (not shown in the figure), and the screen <NUM> may be mounted on the mounting surface by bonding. The screen <NUM> includes a display surface <NUM> that is away from the frame <NUM>, and the display surface <NUM> is configured to display an image, a video, and the like. It should be understood that, the screen <NUM> is not limited to a 2D (Dimensions, dimension) display shown in <FIG>, or may be a <NUM>. 5D curved screen or a 3D curved screen.

In an implementation, the screen <NUM> includes a cover plate and a display panel fixed to the cover plate. The cover plate may be made of a transparent material such as glass. The display panel may be an LCD (Liquid Crystal Display, liquid crystal display), an OLED (Organic Light-Emitting Diode, organic light-emitting diode) display, or an AMOLED (Active-Matrix Organic Light-Emitting Diode, active-matrix organic light-emitting diode) display, an FLED (Flex Light-Emitting Diode, flex light-emitting diode) display, a mini LED, a micro LED, a micro OLED, QLED (Quantum Dot Light Emitting Diodes, quantum dot light emitting diodes), or the like. In addition, the display panel may be further integrated with a touch function. That is, the display panel is a touch display panel. In this case, the display panel is electrically connected to the mainboard <NUM>. The display panel can generate a touch signal, and transmit the touch signal to a main processor (not shown in the figure) on the mainboard <NUM>. The main processor receives the touch signal, and controls enabling of an application (Application, App) in the electronic device <NUM> based on the touch signal.

The screen <NUM> and the rear cover <NUM> are located on two sides of the frame <NUM>, and form the overall inner cavity with the frame <NUM> through enclosing. Components such as a battery, a memory card, and a camera may be accommodated in the overall inner cavity. As shown in <FIG>, the frame <NUM>, the rear cover <NUM>, and the screen <NUM> form a roughly cuboid structure through enclosing.

The mainboard <NUM> is installed in the overall inner cavity. The mainboard <NUM> is further provided with a signal processor (not shown in the figure), and the signal processor is electrically connected to the main processor. In this embodiment, the main processor is a CPU (central processing unit, Central Processing Unit) of the electronic device <NUM>, and the signal processor is a PA (power amplifier, Power Amplifier). The main processor sends an audio signal, and the signal processor receives the audio signal, and performs signal processing such as amplification and modification on the audio signal, to optimize the audio signal to be sent to the speaker module <NUM>, improve sound quality of the speaker module <NUM>, and improve audio performance of the electronic device <NUM>.

The speaker module <NUM> is electrically connected to the signal processor. The speaker module is provided with a sound outlet hole (not shown in the figure). The speaker module <NUM> receives the audio signal processed by the signal processor, and vibrates to make a sound based on the audio signal. The sound is transmitted to the external environment through the sound outlet hole and the speaker hole <NUM> in sequence, so that the electronic device <NUM> makes a sound.

Refer to <FIG> and <FIG>. <FIG> is a schematic diagram of a structure of the speaker module <NUM> in the electronic device <NUM> shown in <FIG>. <FIG> is a schematic diagram of an exploded structure of the speaker module <NUM> shown in <FIG>.

The speaker module <NUM> includes a first enclosure <NUM>, a second enclosure <NUM>, a waterproof breathable film <NUM>, a speaker core <NUM>, and a circuit board <NUM>. A sound outlet hole <NUM> is disposed on the first enclosure <NUM>. Specifically, the first enclosure <NUM> and the second enclosure <NUM> are fastened to each other, to form a sound cavity (not shown in the figure). Both the waterproof breathable film <NUM> and the speaker core <NUM> are accommodated in the sound cavity. A part of the circuit board <NUM> is located inside the sound cavity and is electrically connected to the speaker core <NUM>, and the other part is located outside the sound cavity and is electrically connected to the signal processor, to transmit the audio signal processed by the signal processor to the speaker core <NUM>. The speaker core <NUM> receives the audio signal processed by the signal processor, and drives, based on the audio signal, air in the sound cavity to vibrate to make a sound. The sound is transmitted to the outside of the sound cavity through the sound outlet hole <NUM>, so that the speaker module <NUM> makes a sound.

Refer to <FIG> and <FIG> is a schematic diagram of a structure of the first enclosure sectioned in an A-A direction in the speaker module shown in <FIG>. In the accompanying drawings of this application, "sectioning in the A-A direction" means sectioning along a plane in which a line A-A and arrows at two ends of the line A-A are located. The following descriptions of the accompanying drawings are understood in the same way.

The first enclosure <NUM> is provided with an accommodating groove <NUM> and a resonant groove <NUM>. Specifically, the first enclosure <NUM> includes a bottom wall <NUM>, and a first side wall <NUM> and a second side wall <NUM> that are connected to the bottom wall <NUM>. The first side wall <NUM> and the bottom wall <NUM> form the accommodating groove <NUM> through enclosing. The first side wall <NUM> includes a first inner wall surface <NUM> facing the accommodating groove <NUM> and a first outer wall surface <NUM> facing away from the accommodating groove <NUM>. The first inner wall surface <NUM> partially protrudes to form a first step part <NUM>. The first step part <NUM> includes a first step surface <NUM> and a second step surface <NUM> that face a same direction as an opening of the accommodating groove <NUM>. The second step surface <NUM> is located on a side that is of the first step surface <NUM> and that is away from the first side wall <NUM>. A height of the second step surface <NUM> is less than a height of the first step surface <NUM>. It should be understood that a height used when the first enclosure <NUM> is described in this application is a height size in a direction perpendicular to the bottom wall <NUM> of the first enclosure <NUM>.

The first inner wall surface <NUM> is partially concave to form the sound outlet hole <NUM>, and an opening of the sound outlet hole <NUM> is located on a side that is of the second step surface <NUM> and that is away from the first step surface <NUM>. The sound outlet hole <NUM> extends from the first inner wall surface <NUM> to the first outer wall surface <NUM>, and penetrates through the first outer wall surface <NUM>, to connect the accommodating groove <NUM> and the outside of the first enclosure <NUM>. It should be understood that a shape of the sound outlet hole <NUM> is not limited to the square shown in <FIG>, and may also be a cylinder or a strip.

Refer to <FIG> and <FIG> is a schematic diagram of a structure of the first enclosure <NUM> sectioned in a B-B direction in the speaker module <NUM> shown in <FIG>.

The second side wall <NUM> is connected to the first side wall <NUM>, and the second side wall <NUM> and the bottom wall <NUM> form the resonant groove <NUM> through enclosing. The second side wall <NUM> includes a second inner wall surface <NUM> facing the resonant groove <NUM> and a second outer wall surface <NUM> facing away from the resonant groove <NUM>. The second inner wall surface <NUM> partially protrudes to form a second step part <NUM>. The second step part <NUM> includes a third step surface <NUM> and a fourth step surface <NUM>. The third step surface <NUM> is connected to the first step surface <NUM> to jointly bear the second enclosure <NUM> with the first step surface <NUM>. The fourth step surface <NUM> is located on a side that is of the third step surface <NUM> and that is away from the second side wall <NUM>, and a height of the fourth step surface <NUM> is less than a height of the third step surface <NUM> and is greater than the height of the second step surface <NUM>. The first side wall <NUM> and the second side wall <NUM> may be integrally formed.

Abottom of the resonant groove <NUM> is provided with a communicating hole <NUM>, and the resonant groove <NUM> communicates with the accommodating groove <NUM> through the communicating hole <NUM>. Specifically, the communicating hole <NUM> extends in a direction from the bottom of the resonant groove <NUM> to the accommodating groove <NUM>, and penetrates through the first inner wall surface <NUM>. An opening through which the communicating hole <NUM> communicates with the resonant groove <NUM> is partially located on a bottom wall surface of the resonant groove <NUM>, and is partially located on a side wall surface of the resonant groove <NUM>. That is, the opening through which the communicating hole <NUM> communicates with the resonant groove <NUM> is located at a joint of the second inner wall surface <NUM> and a bottom wall surface <NUM> of the bottom wall <NUM>. That is, the opening through which the communicating hole <NUM> communicates with the resonant groove <NUM> is partially located on the second inner wall surface <NUM>, and is partially located on the bottom wall surface <NUM> of the bottom wall <NUM>, to ensure a sufficient volume of the communicating hole <NUM> and a proper air flow rate between the accommodating groove <NUM> and the resonant groove <NUM>. A ratio V1/V2 of a volume V1 of the resonant groove <NUM> to a volume V2 of the communicating hole <NUM> is between <NUM> and <NUM>, to limit an air flow rate in the communicating hole <NUM> and control an air exchange rate between the resonant groove <NUM> and the accommodating groove <NUM>. It may be understood that the bottom wall surface of the resonant groove <NUM> is a part of the bottom wall surface <NUM> of the bottom wall <NUM>.

Refer to <FIG> and <FIG>. <FIG> is a schematic diagram of a structure of the speaker module <NUM> shown in <FIG> sectioned in a C-C direction. <FIG> is a schematic diagram of a structure of the speaker module <NUM> shown in <FIG> sectioned in a D-D direction.

The second enclosure <NUM> is located on a side that is of the speaker core <NUM> and that is away from the first enclosure <NUM>. The second enclosure <NUM> includes a bottom surface <NUM> facing the speaker core <NUM>. A periphery of the bottom surface <NUM> of the second enclosure <NUM> partially protrudes to form a limiting protruding strip <NUM>. The second enclosure <NUM> covers the first enclosure <NUM>, and forms a sound cavity <NUM> with the first enclosure <NUM> through enclosing. Specifically, the limiting protruding strip <NUM> is mounted on the first step surface <NUM> and the third step surface <NUM>, and the limiting protruding strip <NUM> may be mounted on the first step surface <NUM> and the third step surface <NUM> by bonding, so that the second enclosure <NUM> and the first enclosure <NUM> are fastened to each other.

The speaker core <NUM> is accommodated in the sound cavity <NUM>. That is, the speaker core <NUM> is located between the second enclosure <NUM> and the first enclosure <NUM>. The speaker core <NUM> is a moving coil speaker core. Certainly, the speaker core <NUM> may alternatively be a piezoelectric speaker core. In the speaker module <NUM> shown in this embodiment, the second enclosure <NUM> and the first enclosure <NUM> form a modular structure. The second enclosure <NUM> and the first enclosure <NUM> can not only fully protect the speaker core <NUM> located between the second enclosure <NUM> and the first enclosure <NUM>, but also help simplify assembly of the speaker module <NUM> and other components.

<FIG> is a schematic diagram of an exploded structure of the speaker core <NUM> in the speaker module <NUM> shown in <FIG>.

The speaker core <NUM> includes a support assembly <NUM>, a magnetic circuit assembly <NUM>, and a vibration assembly <NUM>. The support assembly <NUM> is configured to support the magnetic circuit assembly <NUM> and the vibration assembly <NUM>. The magnetic circuit assembly <NUM> is located on one side of the support assembly <NUM>, and is configured to provide a magnetic field. The vibration assembly <NUM> is located on the other side of the support assembly <NUM>, and a part of the vibration assembly <NUM> may vibrate relative to the support assembly <NUM>.

In this embodiment, the support assembly <NUM> is a basin stand, and the basin stand supports the magnetic circuit assembly <NUM> and the vibration assembly <NUM>. The basin stand is roughly a cuboid frame. The basin stand includes a top surface <NUM> and a bottom surface <NUM> that are disposed back to back. The basin stand is provided with a third fastening groove <NUM> and a through hole <NUM>. An opening of the third fastening groove <NUM> is located in a middle area of the top surface <NUM> of the basin stand. The third fastening groove <NUM> is concave from the top surface <NUM> of the basin stand to the bottom surface <NUM>, and the third fastening groove <NUM> includes a bottom wall surface <NUM>. An opening of the through hole <NUM> of the basin stand is located on the bottom wall surface <NUM> of the third fastening groove <NUM>. The through hole <NUM> of the basin stand extends from the bottom wall surface <NUM> of the third fastening groove <NUM> to the bottom surface <NUM> of the basin stand, and penetrates through the bottom surface <NUM> of the basin stand. An edge area of the top surface <NUM> of the basin stand partially protrudes to form a plurality of feet <NUM>, and the plurality of feet <NUM> are disposed at intervals. There are eight feet <NUM>, and every two feet <NUM> are located on one side of the basin stand.

Refer to <FIG> together. <FIG> is a schematic diagram of an exploded structure of the magnetic circuit assembly <NUM> in the speaker core <NUM> shown in <FIG>.

The magnetic circuit assembly <NUM> is located on a side close to the top surface <NUM> of the basin stand. The magnetic circuit assembly <NUM> includes a magnetic yoke (yoke) <NUM>, a central magnet <NUM>, two first side magnets <NUM>, two second side magnets <NUM>, a central electrode plate (washer) <NUM>, and a side electrode plate <NUM>. The magnetic yoke <NUM> is configured to bear the central magnet <NUM>, the two first side magnets <NUM>, and the two second side magnets <NUM>. The central electrode plate <NUM> and the side electrode plate <NUM> are located on a side that is of the central magnet <NUM>, the two first side magnets <NUM>, and the two second side magnets <NUM> and that is away from the magnetic yoke <NUM>. The magnetic yoke <NUM>, the central electrode plate <NUM>, and the side electrode plate <NUM> are magnetic conductors, and the central magnet <NUM>, the two first side magnets <NUM>, and the two second side magnets <NUM> are permanent magnets.

The magnetic yoke <NUM> includes a bearing surface 4421a facing the basin stand. The bearing surface 4421a of the magnetic yoke <NUM> includes a central area (not shown in the figure) and two first areas (not shown in the figure) and two second areas (not shown in the figure) that are connected to the central area. The central area is roughly rectangular. The two first areas are symmetrically located on two sides of the central area, and the two second areas are symmetrically located on the other two sides of the central area.

Refer to <FIG> together. <FIG> is a schematic diagram of an assembly structure of the central magnet <NUM>, the first side magnets <NUM>, and the second side magnets <NUM> that are mounted on the magnetic yoke <NUM> shown in <FIG>.

The central magnet <NUM>, the two first side magnets <NUM>, and the two second side magnets <NUM> are all mounted on the bearing surface 4421a of the magnetic yoke <NUM>. The central magnet <NUM>, the first side magnets <NUM>, and the second side magnets <NUM> are all mounted on the bearing surface 4421a of the magnetic yoke <NUM> by bonding. The central magnet <NUM> is roughly of a cuboid structure. Specifically, the central magnet <NUM> is mounted on the central area of the bearing surface 4421a. The two first side magnets <NUM> are respectively mounted on the two first areas, and are symmetrically distributed on two sides of the central magnet <NUM>. First gaps 4422a are formed between the first side magnets <NUM> and the central magnet <NUM>. The two second side magnets <NUM> are respectively mounted on the two second areas, and are symmetrically distributed on the other two sides of the central magnet <NUM>. Second gaps 4422b are formed between the second side magnets <NUM> and the central magnet <NUM>. Four third gaps 4422c are respectively formed on outer sides of four corners of the central magnet <NUM>. Each third gap 4422c connects the first gap 4422a and the second gap 4422b that are adjacent to each other, and communicates with the outside of the magnetic circuit assembly <NUM>.

Refer to <FIG> and <FIG> is a schematic diagram of a structure of the magnetic circuit assembly <NUM> in the speaker core <NUM> shown in <FIG> from another angle.

The central electrode plate <NUM> is mounted on a surface that is of the central magnet <NUM> and that is away from the magnetic yoke <NUM>, and the central electrode plate <NUM> may be mounted, by bonding, on the surface that is of the central magnet <NUM> and that is away from the magnetic yoke <NUM>. The central electrode plate <NUM> is roughly in a rectangular plate shape, and exactly covers a surface that is of the central magnet <NUM> and that is away from the magnetic yoke <NUM>.

The side electrode plate <NUM> and the central electrode plate <NUM> are located on a same side of the central magnet <NUM>, and are disposed around the central electrode plate <NUM>. The side electrode plate <NUM> is roughly in a square ring shape. The side electrode plate <NUM> includes two oppositely disposed first electrode plate parts 4426a, two oppositely disposed second electrode plate parts 4426b, and four electrode plate connection parts 4426c connected between the first electrode plate parts 4426a and the second electrode plate parts 4426b. The two first electrode plate parts 4426a are respectively mounted on surfaces that are of the two first side magnets <NUM> and that are away from the magnetic yoke <NUM>, and the first electrode plate parts 4426a may be mounted, by bonding, on the surfaces that are of the first side magnets <NUM> and that are away from the magnetic yoke <NUM>. The two first electrode plate parts 4426a are symmetrically distributed on two sides of the central electrode plate <NUM>, a fourth gap 4425a is formed between each first electrode plate part 4426a and the central electrode plate <NUM>, and the fourth gap 4425a communicates with the first gap (not shown in the figure). The two second electrode plate parts 4426b are respectively mounted on surfaces that are of the two second side magnets <NUM> and that are away from the magnetic yoke <NUM>, and the second electrode plate parts 4426b may be mounted, by bonding, on the surfaces that are of the second side magnets <NUM> and that are away from the magnetic yoke <NUM>. The two second electrode plate parts 4426b are symmetrically distributed on the other two sides of the central electrode plate <NUM>, and a fifth gap 4425b is formed between each second electrode plate part 4426b and the central electrode plate <NUM>. The fifth gap 4425b communicates with the second gap (not shown in the figure). In this case, a sixth gap 4425c is formed between the electrode plate connection part 4426c and the central electrode plate <NUM>, and the sixth gap 4425c connects the fourth gap 4425a and the fifth gap 4425b that are adjacent to each other, and communicates with the third gap (not shown in the figure).

Refer to <FIG> is a schematic diagram of an assembly structure in which the magnetic circuit assembly <NUM> in the speaker core <NUM> shown in <FIG> is mounted on the support assembly <NUM>. <FIG> is a schematic diagram of an internal structure of the assembly structure shown in <FIG> sectioned in an E-E direction.

The magnetic circuit assembly <NUM> is mounted on the basin stand. Specifically, a part of the magnetic circuit assembly <NUM> is mounted on the third fastening groove <NUM> of the basin stand, and a part of the magnetic circuit assembly <NUM> extends out of the third fastening groove <NUM>. The side electrode plate <NUM> of the magnetic circuit assembly <NUM> is mounted on the third fastening groove <NUM>, and the side electrode plate <NUM> may be mounted on the third fastening groove <NUM> by bonding. A surface of the side electrode plate <NUM> that faces a same direction as the top surface <NUM> of the basin stand is flush with the top surface <NUM> of the basin stand, and the central electrode plate <NUM> is accommodated in the third fastening groove <NUM>. In this case, the fourth gaps (not shown in the figure), the fifth gaps 4425b, and the sixth gaps (not shown in the figure) all communicate with the through hole <NUM> of the basin stand.

The magnetic yoke <NUM>, the central magnet <NUM>, the two first side magnets (not shown in the figure), and the two second side magnets <NUM> all extend out of the third fastening groove <NUM>. The two first side magnets (not shown in the figure) and the two second side magnets <NUM> each are partially located on the top surface <NUM> of the basin stand, and the first side magnets and the second side magnets are all located between the two feet <NUM>.

Refer to <FIG> and <FIG> is a schematic diagram of an exploded structure of the vibration assembly <NUM> in the speaker core <NUM> shown in <FIG>.

The vibration assembly <NUM> is located on a side that is of the support assembly <NUM> and that is away from the magnetic circuit assembly <NUM>. The vibration assembly <NUM> includes a flexible circuit board <NUM>, a sound diaphragm <NUM>, and a voice coil <NUM>. The flexible circuit board <NUM> is located between the sound diaphragm <NUM> and the voice coil <NUM>. The flexible circuit board <NUM> is roughly in a rectangular plate shape. The flexible circuit board <NUM> is electrically connected to the circuit board (not shown in the figure), and is configured to transmit, to the voice coil <NUM>, an audio signal transmitted by the circuit board <NUM>. The flexible circuit board <NUM> includes a top surface <NUM> and a bottom surface <NUM> that are disposed back to back. The flexible circuit board <NUM> is provided with a through hole <NUM>, and an opening of the through hole <NUM> is located in a middle area of the top surface <NUM> of the flexible circuit board <NUM>. The through hole <NUM> of the flexible circuit board <NUM> extends from the top surface <NUM> of the flexible circuit board <NUM> to the bottom surface <NUM>, and penetrates through the bottom surface <NUM> of the flexible circuit board <NUM>. That is, the through hole <NUM> of the flexible circuit board <NUM> penetrates through the flexible circuit board <NUM> in a thickness direction of the flexible circuit board <NUM>.

Refer to <FIG> and <FIG> is a schematic diagram of a cross-sectional structure of the vibration assembly <NUM> in the speaker core <NUM> shown in <FIG> in an F-F direction.

The sound diaphragm <NUM> is located on one side of the flexible circuit board <NUM>. The sound diaphragm <NUM> includes a dome <NUM> and a diaphragm <NUM> carrying the dome <NUM>. The dome <NUM> is roughly in a rectangular plate shape. The diaphragm <NUM> is roughly in a rectangular ring shape. The diaphragm <NUM> includes a first fastening part 4438a, a surround part 4438b, and a second fastening part 4438c that are connected in sequence. The first fastening part 4438a is located inside the surround part 4438b, and the second fastening part 4438c is located outside the surround part 4438b. The first fastening part 4438a includes a top surface 4438d and a bottom surface 4438e that are disposed back to back. The first fastening part 4438a is provided with a through hole <NUM>8f, and an opening of the through hole 4438f is located in a middle area of the top surface 4438d of the first fastening part 4438a. The through hole 4438f of the first part 4438a extends from the top surface 4438d of the first fastening part 4438a to the bottom surface 4438e, and penetrates through the bottom surface 4438e of the first fastening part 4438a. That is, the through hole 4438f of the first fastening part 4438a penetrates through the first fastening part 4438a in a thickness direction of the first fastening part 4438a. The dome <NUM> is mounted on the bottom surface 4438e of the first fastening part 4438a, and covers the through hole 4438f of the first fastening part 4438a. A cross section of the surround part 4438b is arc-shaped or roughly arc-shaped, and an extension track of the surround part 4438b is a rounded rectangle. The surround part 4438b is concave. To be specific, the surround part 4438b is concave in a direction away from the top surface 4438d of the first fastening part 4438a. When the surround part 4438b is subject to an external force, the surround part 4438b can deform, so that the first fastening part 4438a and the second fastening part 4438c move relative to each other, and the dome <NUM> and the second fastening part 4438c move relative to each other.

The sound diaphragm <NUM> is mounted on the bottom surface <NUM> of the flexible circuit board <NUM>. Specifically, the first fastening part 4438a and the second fastening part 4438c of the diaphragm <NUM> are mounted on the bottom surface <NUM> of the flexible circuit board <NUM>, and the first fastening part 4438a and the second fastening part 4438c may be mounted on the bottom surface <NUM> of the flexible circuit board <NUM> by bonding. In this case, the through hole 4438f of the first fastening part 4438a directly faces the through hole <NUM> of the flexible circuit board <NUM>, and the dome <NUM> covers the through hole <NUM> of the flexible circuit board <NUM>.

The voice coil <NUM> is located on a side that is of the flexible circuit board <NUM> and that is away from the sound diaphragm <NUM>. The voice coil <NUM> is roughly in a square ring shape. The voice coil <NUM> is mounted on the top surface <NUM> of the flexible circuit board <NUM>, and is disposed around a periphery of the through hole <NUM> of the flexible circuit board <NUM>. The voice coil <NUM> may be mounted on the top surface <NUM> of the flexible circuit board <NUM> by welding, and is electrically connected to the flexible circuit board <NUM>. The voice coil <NUM> receives an audio signal transmitted by the flexible circuit board <NUM>, and drives the sound diaphragm <NUM> to vibrate up and down.

<FIG> is a schematic diagram of an internal structure of the speaker core <NUM> sectioned in a G-G direction in the speaker module <NUM> shown in <FIG>.

The vibration assembly <NUM> is mounted on the bottom surface <NUM> of the basin stand. Specifically, an edge part of the flexible circuit board <NUM> in the vibration assembly <NUM> is mounted on the bottom surface <NUM> of the basin stand, and the flexible circuit board <NUM> may be mounted on the bottom surface <NUM> of the basin stand by bonding. In this case, the voice coil <NUM> passes through the through hole <NUM> of the basin stand, passes through the fourth gap (not shown in the figure), the fifth gap 4425b, and the sixth gap (not shown in the figure), and extends into the first gap (not shown in the figure), the second gap 4422b, and the third gap (not shown in the figure). The magnetic circuit assembly <NUM> provides a magnetic field for vibration of the voice coil <NUM>. When the voice coil <NUM> receives an audio signal transmitted by the flexible circuit board <NUM>, the voice coil <NUM> moves up and down to cut a magnetic line of the magnetic field, and drives the flexible circuit board <NUM> and the sound diaphragm <NUM> to vibrate.

Refer to <FIG> and <FIG>. The speaker core <NUM> is accommodated in the sound cavity <NUM>. Specifically, the speaker core <NUM> is mounted on the second step surface <NUM> of the first enclosure <NUM>. The second fastening part 4438c of the sound diaphragm <NUM> in the vibration assembly is mounted on the second step surface <NUM>, and the second fastening part 4438c of the sound diaphragm <NUM> may be mounted on the second step surface <NUM> by bonding. The sound diaphragm <NUM> divides the sound cavity <NUM> into a front sound cavity <NUM> and a rear sound cavity <NUM>. The front sound cavity <NUM> is formed between the first enclosure <NUM> and the sound diaphragm <NUM>. To be specific, the bottom wall <NUM>, the first side wall <NUM>, and the sound diaphragm <NUM> jointly form the front sound cavity <NUM> through enclosing. The sound outlet hole <NUM> connects the front sound cavity <NUM> and the outside of the speaker module <NUM>. The communicating hole <NUM> connects the front sound cavity <NUM> and the resonant groove <NUM>. The rear sound cavity <NUM> is located on a side that is of the sound diaphragm <NUM> and that is away from the front sound cavity <NUM>. That is, the rear sound cavity <NUM> is formed between the sound diaphragm <NUM> and the second enclosure <NUM>. The waterproof breathable film <NUM> is accommodated in the sound cavity <NUM>, and is spaced away from the speaker core <NUM>. The waterproof breathable film <NUM> is mounted on the fourth step surface <NUM> of the first enclosure <NUM>. Specifically, the waterproof breathable film <NUM> may be mounted on the fourth step surface <NUM> by bonding. The waterproof breathable film <NUM> covers an opening that is of the resonant groove <NUM> and that faces the rear sound cavity <NUM>, and forms a resonant cavity together with the resonant groove <NUM>. The resonant cavity communicates with the front sound cavity <NUM> through the communicating hole <NUM>, to weaken a peak value of a high-frequency resonance peak when the speaker module <NUM> works, and improve a phenomenon of a high-frequency sharpness and a heavy labiodental sound when the speaker module <NUM> makes a sound. It should be understood that, in another embodiment, there may be a plurality of resonant cavities in this embodiment. For example, two resonant cavities are symmetrically distributed on two sides of the front sound cavity <NUM>. This is not specifically limited in this application. Air permeability of the waterproof breathable film <NUM> is between <NUM>/min and <NUM>/min. That is, in one minute, the waterproof breathable film <NUM> allows <NUM> to <NUM> air to pass through the waterproof breathable film <NUM>. It should be understood that the waterproof breathable film <NUM> may also have no groove. This is not specifically limited in this application.

When the speaker module <NUM> does not work, due to existence of the waterproof breathable film <NUM>, the front sound cavity <NUM> and the rear sound cavity <NUM> are connected, atmospheric pressure between the front sound cavity <NUM> and the rear sound cavity <NUM> is always balanced, and a position of the sound diaphragm <NUM> in the sound cavity <NUM> does not shift. This does not affect normal working of the speaker module <NUM>. Compared with sound quality of an existing speaker module, sound quality of the speaker module <NUM> is improved. When the speaker module <NUM> works, the vibration assembly <NUM> vibrates to drive air in the sound cavity <NUM> to fluctuate. Because an air flow speed generated due to air fluctuation in the sound cavity <NUM> is far greater than the air permeability of the waterproof breathable film <NUM>, and in this case, the resonant cavity communicates with only the front sound cavity <NUM>, the waterproof breathable film <NUM> approximately isolates the front sound cavity <NUM> from the rear sound cavity <NUM>, to prevent air flowing between the front sound cavity <NUM> and the rear sound cavity <NUM> from affecting a volume of a sound made by the speaker module <NUM>. In addition, the resonant cavity and the front sound cavity <NUM> form a Helmholtz resonator (Helmholtz resonators) having a resonance frequency. Based on a Helmholtz resonance (Helmholtz resonance) principle, the resonant cavity forms an anti-resonance peak value at a high-frequency resonance peak of the front sound cavity <NUM>, to weaken a peak value of the speaker module <NUM> at the high-frequency resonance peak, improve flatness of a high-frequency response, and improve acoustic performance of the speaker module <NUM>.

<FIG> is a schematic diagram of emulation results of audio performance tests on the speaker module <NUM> in the electronic device <NUM> shown in <FIG> and an existing speaker module. A difference between the existing speaker module and the speaker module <NUM> in the electronic device <NUM> shown in this embodiment lies in that no resonant cavity is designed in the existing speaker module. A black solid line is a test result of the electronic device <NUM> shown in this embodiment, and a black dashed line is a test result of an existing electronic device.

Compared with the existing speaker module, in the speaker module <NUM> of the electronic device <NUM> in this embodiment of this application, the resonant cavity that communicates with the front sound cavity <NUM> is designed, so that a peak value at a high-frequency resonance peak (about <NUM> to <NUM>, as shown by a dashed circle in <FIG>) is reduced by about <NUM> dB, loudness of the high-frequency resonance peak is reduced, less high-frequency dental sound and metal sound are generated, and sound quality of the speaker module <NUM> is improved.

<FIG> is a schematic diagram of a partial structure of the electronic device <NUM> shown in <FIG> sectioned in an H-H direction.

The speaker module <NUM> is installed in the overall inner cavity <NUM>. Specifically, the speaker module <NUM> is mounted on the mounting surface <NUM> of the rear cover <NUM>, and the speaker module <NUM> is disposed close to the lower frame <NUM>. The first enclosure <NUM> in the speaker module <NUM> is mounted on the mounting surface <NUM>, and the first enclosure <NUM> may be mounted on the mounting surface <NUM> by bonding. The sound outlet hole <NUM> of the first enclosure <NUM> faces the speaker hole <NUM>, and directly faces the speaker hole <NUM>. When the speaker module <NUM> receives an audio signal processed by the signal processor, and vibrates to make a sound, the sound is transmitted to the external environment through the sound outlet hole <NUM> and the speaker hole <NUM> in sequence, so that the electronic device <NUM> makes a sound. It should be noted that, in another embodiment, the speaker module <NUM> may also be installed on a middle plate or a support. This is not specifically limited in this application.

In the electronic device <NUM> shown in this embodiment, the speaker module <NUM> is provided with only the sound outlet hole <NUM> that communicates with the external environment, and the sound cavity <NUM> of the speaker module <NUM> does not communicate with the overall inner cavity <NUM> of the electronic device <NUM>. When the electronic device <NUM> is pressed or released in a use process, a change in internal atmospheric pressure of the overall inner cavity <NUM> does not affect balance of internal atmospheric pressure of the front sound cavity <NUM> and the rear sound cavity <NUM> in the speaker module <NUM>, a position of the sound diaphragm <NUM> in the sound cavity <NUM> does not shift, and normal working of the speaker module <NUM> is not affected. Compared with sound quality of an existing electronic device, sound quality of the speaker module <NUM> is improved.

<FIG> is a schematic diagram of a structure of a housing <NUM> in a second electronic device <NUM> according to an embodiment of this application.

A difference between this embodiment and the electronic device <NUM> shown in the first embodiment lies in that a rear cover <NUM> of the housing <NUM> is provided with a mounting groove <NUM>, and an opening of the mounting groove <NUM> is located on a mounting surface <NUM>. The mounting groove <NUM> is concave from the mounting surface <NUM> to a surface that is away from a frame <NUM>. The opening of the mounting groove <NUM> is located in an area that is of the mounting surface <NUM> and that faces a lower frame <NUM>.

<FIG> is a schematic diagram of a structure of a speaker module <NUM> sectioned in a C-C direction in the second electronic device <NUM> according to an embodiment of this application.

In this embodiment, a first enclosure <NUM> is provided with a groove <NUM>, and an opening of the groove <NUM> is located on a bottom wall surface of an accommodating groove <NUM>. That is, the opening of the groove <NUM> is located on a bottom wall surface <NUM> of a bottom wall <NUM>. Specifically, the opening of the groove <NUM> is located in a middle area in the bottom wall surface <NUM> of the bottom wall <NUM>. The groove <NUM> is concave from the bottom wall surface <NUM> of the bottom wall <NUM> in a direction away from an opening of the accommodating groove <NUM>. An outer wall surface <NUM> of the bottom wall <NUM> partially protrudes to form a protrusion part <NUM>, and the groove <NUM> is located in the protrusion part <NUM>. It may be understood that the bottom wall surface of the accommodating groove <NUM> is a part of the bottom wall surface <NUM> of the bottom wall <NUM>.

A dome <NUM> of a speaker core <NUM> directly faces the groove <NUM>. That is, an orthographic projection of the dome <NUM> on the bottom wall surface <NUM> of the bottom wall <NUM> is located in the opening of the groove <NUM>, so that when the sound diaphragm <NUM> vibrates, the dome <NUM> may partially or completely extend into the groove <NUM>, to increase vibration space between the dome <NUM> and the first enclosure <NUM>. Utilization of space between a surround portion 4438b of a diaphragm <NUM> and the first enclosure <NUM> is increased, to help increase vibration amplitude of the sound diaphragm <NUM>.

A distance between the dome <NUM> and a groove bottom surface <NUM> of the groove <NUM> is greater than or equal to a distance between the surround part 4438b and the bottom wall surface <NUM> of the bottom wall <NUM>, so that when the vibration space between the dome <NUM> and the first enclosure <NUM> is fully used, the vibration space between the surround portion 4438b of the diaphragm <NUM> and the first enclosure <NUM> can also be fully used. This helps increase vibration amplitude of the sound diaphragm <NUM>, and improve audio performance of a sound made by the speaker module <NUM>.

Refer to <FIG> together. <FIG> is a schematic diagram of a partial structure of the second electronic device <NUM> sectioned in an H-H direction according to an embodiment of this application.

The speaker module <NUM> is mounted on the mounting surface <NUM>, and the speaker module <NUM> is disposed close to the lower frame <NUM>. Specifically, the first enclosure <NUM> is partially accommodated in the mounting groove <NUM>. In this case, the protrusion part <NUM>, that is, a part that forms the groove <NUM> in the first enclosure <NUM>, is accommodated in the mounting groove <NUM>, so that vibration space between the dome <NUM> and the first enclosure <NUM> is increased in the limited overall inner cavity <NUM> without increasing a thickness of the electronic device <NUM>. This helps increase vibration amplitude of the sound diaphragm <NUM> and improve audio performance of the electronic device <NUM>.

<FIG> is a schematic diagram of a structure of a third electronic device <NUM> according to an embodiment of this application.

A difference between the electronic device <NUM> shown in this embodiment and the foregoing two electronic devices <NUM> lies in that a screen <NUM> is provided with a speaker hole <NUM>. The electronic device <NUM> includes two speaker modules <NUM> and a support <NUM>. The two speaker modules <NUM> and the support <NUM> are all accommodated in an overall inner cavity. A structure of one speaker module <NUM> is the same as a structure of the speaker module <NUM> in the electronic device <NUM> shown in the foregoing two embodiments, and details are not described herein again. The other speaker module <NUM> is electrically connected to a mainboard <NUM>, receives an audio signal transmitted by the mainboard <NUM>, and vibrates to make a sound based on the received audio signal. The sound is diffused to an external environment through the speaker hole <NUM>, so that the electronic device <NUM> makes a sound. The speaker hole <NUM> is a receiver hole. That is, the other speaker module <NUM> is used by the electronic device <NUM> to make a sound by using a receiver.

The screen <NUM> includes a non-display surface <NUM> and a display surface <NUM> that are disposed back to back. An opening of the speaker hole <NUM> is located on the display surface <NUM>, and the speaker hole <NUM> extends from the display surface <NUM> to the non-display surface <NUM> and penetrates through the non-display surface <NUM>. That is, the speaker hole <NUM> penetrates through the screen <NUM> along a thickness direction of the screen <NUM>. The opening of the speaker hole <NUM> is located in an area that is of the display surface <NUM> and that is close to an upper frame <NUM>. It should be understood that other structure of the screen <NUM> is roughly the same as the structure of the screen <NUM> shown in the foregoing two embodiments, and details are not described herein again.

<FIG> is a schematic diagram of a structure of the support <NUM> in the electronic device <NUM> shown in <FIG>.

The support <NUM> includes an assembly surface <NUM> and a mounting surface <NUM> that are disposed back to back. The support <NUM> is provided with an assembly groove <NUM>. An opening of the assembly groove <NUM> of the support <NUM> is located on the assembly surface <NUM> of the support <NUM>. The assembly groove <NUM> of the support <NUM> extends from the assembly surface <NUM> of the support <NUM> to the mounting surface <NUM>, and penetrates through the mounting surface <NUM> of the support <NUM>. That is, the assembly groove <NUM> of the support <NUM> penetrates through the support <NUM> in a thickness direction of the support <NUM>. The assembly surface <NUM> of the support <NUM> partially protrudes to form a limiting frame <NUM>. The limiting frame <NUM> protrudes from the assembly surface <NUM> of the support <NUM> in a direction away from the mounting surface <NUM>, and is disposed around a periphery of the assembly groove <NUM>. It should be understood that a shape of the limiting frame <NUM> is not limited to the square shown in <FIG>, and may also be another shape such as a circle or an ellipse.

It should be noted that orientation terms such as "top" and "bottom" used in the electronic device <NUM> in this embodiment are mainly described based on a display orientation of the electronic device <NUM> in <FIG>, and do not limit an orientation of the electronic device <NUM> in an actual application scenario.

<FIG> is a schematic diagram of a partial structure of the electronic device <NUM> shown in <FIG> sectioned in an I-I direction.

The support <NUM> is accommodated in the overall space <NUM>. Specifically, the support <NUM> is mounted on an area that is of the non-display surface <NUM> of the screen <NUM> and that is close to the upper frame (not shown in the figure), and the support <NUM> may be mounted on the non-display surface <NUM> by bonding. In this case, the limiting frame <NUM> is located on a side that is of the support <NUM> and that is away from the screen <NUM>, the assembly groove <NUM> of the support <NUM> communicates with the speaker hole <NUM>, and the assembly groove <NUM> and the speaker hole <NUM> directly face each other.

Refer to <FIG> together. <FIG> is a schematic diagram of a structure of the speaker module <NUM> in the electronic device <NUM> shown in <FIG>.

The speaker module <NUM> is located on a side that is of the support <NUM> and that is away from the screen <NUM>. The speaker module <NUM> is provided with a sound outlet hole <NUM>. Specifically, the speaker module <NUM> includes a first enclosure <NUM> and a speaker core <NUM>, and the speaker core <NUM> is mounted on the first enclosure <NUM>. The sound outlet hole <NUM> is disposed on the first enclosure <NUM>.

The first enclosure <NUM> is provided with an accommodating groove <NUM> and a groove <NUM>. The first enclosure <NUM> includes a bottom wall <NUM> and a first side wall <NUM> connected to the bottom wall <NUM>. The first side wall <NUM> and the bottom wall <NUM> form the accommodating groove <NUM> through enclosing. The bottom wall <NUM> includes a bottom wall surface <NUM> facing the accommodating groove <NUM> and an outer wall surface <NUM> facing away from the accommodating groove <NUM>. An opening of the groove <NUM> is located on the bottom wall surface <NUM> of the bottom wall <NUM>, and the groove <NUM> is concave from the bottom wall surface <NUM> of the bottom wall <NUM> in a direction away from the opening of the accommodating groove <NUM>. An opening of the sound outlet hole <NUM> is located on a groove bottom surface <NUM> of the groove <NUM>. The sound outlet hole <NUM> extends from the groove bottom surface <NUM> of the groove <NUM> in a direction away from the groove <NUM>, and penetrates through a top surface of the first enclosure <NUM>, to connect the accommodating groove <NUM> and the outside of the speaker module <NUM>. The outer wall surface <NUM> of the bottom wall <NUM> partially protrudes to form a protrusion part <NUM>, the protrusion part <NUM> protrudes from the outer wall surface <NUM> of the accommodating groove <NUM> in a direction away from the bottom wall surface <NUM>, and the groove <NUM> is located in the protrusion part <NUM>.

The speaker core <NUM> is mounted on a bottom surface of the first enclosure <NUM>, and is partially accommodated in the accommodating groove <NUM>. A front sound cavity <NUM> is formed between the speaker core <NUM> and the first enclosure <NUM>. That is, the speaker core <NUM>, the bottom wall <NUM>, and the first side wall <NUM> jointly form the front sound cavity <NUM> through enclosing, and the sound outlet hole <NUM> connects the front sound cavity <NUM> and the outside of the speaker module <NUM>. It should be noted that orientation terms such as "top" and "bottom" used in the electronic device <NUM> in this embodiment are mainly described based on a display orientation of the electronic device <NUM> in <FIG>, and do not limit an orientation of the electronic device <NUM> in an actual application scenario.

The speaker core <NUM> includes a support assembly <NUM>, a magnetic circuit assembly <NUM>, and a vibration assembly <NUM>. The support assembly <NUM> is configured to support the magnetic circuit assembly <NUM> and the vibration assembly <NUM>. The magnetic circuit assembly <NUM> is located on one side of the support assembly <NUM>, and is configured to provide a magnetic field. The vibration assembly <NUM> is located on the other side of the support assembly <NUM>, and a part of the vibration assembly <NUM> may vibrate relative to the support assembly <NUM>. The speaker core <NUM> is a moving coil speaker core.

The support assembly <NUM> includes a basin stand, and the basin stand supports the magnetic circuit assembly <NUM> and the vibration assembly <NUM>. The basin stand is roughly a cuboid frame. The basin stand includes a top surface <NUM> and a bottom surface <NUM> that are disposed back to back, and an outer circumferential surface connected between the top surface <NUM> and the bottom surface <NUM>. The basin stand is provided with a third fastening groove <NUM> and a through hole <NUM>. An opening of the third fastening groove <NUM> is located in a middle area of the bottom surface <NUM> of the basin stand. The third fastening groove <NUM> is concave from the bottom surface <NUM> of the basin stand to the top surface <NUM>, and partially penetrates through the outer circumferential surface <NUM> of the basin stand. The third fastening groove <NUM> includes a bottom wall surface <NUM>. An opening of the through hole <NUM> of the basin stand is located on the bottom wall surface <NUM> of the third fastening groove <NUM>. The through hole <NUM> of the basin stand extends from the bottom wall surface <NUM> of the third fastening groove <NUM> to the top surface <NUM> of the basin stand, and penetrates through the top surface <NUM> of the basin stand.

The magnetic circuit assembly <NUM> is located on a side close to the bottom surface <NUM> of the basin stand. The magnetic circuit assembly <NUM> includes a magnetic yoke <NUM>, a central magnet <NUM>, two first side magnets <NUM>, a central electrode plate <NUM>, and a side electrode plate <NUM>. The magnetic yoke <NUM> is configured to bear the central magnet <NUM> and the two first side magnets <NUM>. The central electrode plate <NUM> and the side electrode plate <NUM> are located on a side that is of the central magnet <NUM> and the two first side magnets <NUM> and that is away from the magnetic yoke <NUM>. The magnetic yoke <NUM>, the central electrode plate <NUM>, and the side electrode plate <NUM> are magnetic conductors, and the central magnet <NUM> and the two first side magnets <NUM> are permanent magnets.

Two peripheral edges of the magnetic yoke <NUM> disposed opposite to each other are bent and extended to form two mounting parts <NUM>. The magnetic yoke <NUM> includes a bearing surface 4421a facing the basin stand. The bearing surface 4421a includes a central area 4421b and two first areas 4421c connected to the central area 4421b. The central area 4421b is roughly rectangular. The two first areas 4421c are symmetrically located on two sides of the central area 4421b, and the two mounting parts <NUM> are symmetrically distributed on the other two sides of the central area 4421b.

<FIG> is a schematic diagram of an assembly structure of the central magnet <NUM> and the first side magnets <NUM> shown in <FIG> that are mounted on the magnetic yoke <NUM>.

The central magnet <NUM> and the two first side magnets <NUM> are all mounted on the bearing surface 4421a of the magnetic yoke <NUM>. The central magnet <NUM> and the first side magnets <NUM> may be all mounted on the bearing surface 4421a by bonding. The central magnet <NUM> is roughly of a cuboid structure. The central magnet <NUM> is mounted on the central area of the bearing surface 4421a. The two first side magnets <NUM> are respectively mounted on the two first areas, and are symmetrically distributed on two sides of the central magnet <NUM>. First gaps 4422a are formed between the first side magnets <NUM> and the central magnet <NUM>. The two mounting parts <NUM> are symmetrically distributed on the other two sides of the central magnet <NUM>, and second gaps 4422b are formed between the mounting parts <NUM> and the central magnet <NUM>. Four third gaps 4422c are respectively formed on outer sides of four corners of the central magnet <NUM>. Each third gap 4422c connects the first gap 4422a and the second gap 4422b that are adjacent to each other, and communicates with the outside of the magnetic circuit assembly <NUM>.

Refer to <FIG> and <FIG>. The central electrode plate <NUM> is mounted on a surface that is of the central magnet <NUM> and that is away from the magnetic yoke <NUM>, and the central electrode plate <NUM> may be mounted, by bonding, on the surface that is of the central magnet <NUM> and that is away from the magnetic yoke <NUM>. The central electrode plate <NUM> is roughly in a rectangular plate shape, and exactly covers a surface that is of the central magnet <NUM> and that is away from the magnetic yoke <NUM>.

The side electrode plate <NUM> and the central electrode plate <NUM> are located on a same side of the central magnet <NUM>, and are disposed around the central electrode plate <NUM>. Two first electrode plate parts 4426a are oppositely disposed on the side electrode plate <NUM>. The two first electrode plate parts 4426a are respectively mounted on surfaces that are of the two first side magnets <NUM> and that are away from the magnetic yoke <NUM>, and the first electrode plate parts 4426a may be mounted, by bonding, on the surfaces that are of the first side magnets <NUM> and that are away from the magnetic yoke <NUM>. The two first electrode plate parts 4426a are symmetrically distributed on two sides of the central electrode plate <NUM>, a fourth gap 4425a is formed between the first electrode plate part 4426a and the central electrode plate <NUM>, and the fourth gap 4425a communicates with the first gap (not shown in the figure). The two mounting parts <NUM> are symmetrically distributed on the other two sides of the central electrode plate <NUM>, a fifth gap 4425b is formed between the mounting part <NUM> and the central electrode plate <NUM>, and the fifth gap 4425b communicates with the second gap (not shown in the figure). Four sixth gaps 4425c are formed on the outer sides of the four corners of the central electrode plate <NUM>, and each sixth gap 4425c connects the fourth gap 4425a and fifth gap 4425b that are adjacent, and communicates with the third gap (not shown in the figure).

Refer to <FIG> and <FIG>. <FIG> is a schematic diagram of an assembly structure in which the magnetic circuit assembly <NUM> in the speaker core <NUM> shown in <FIG> is mounted on the support assembly <NUM>. <FIG> is a schematic diagram of a structure of the assembly structure shown in <FIG> sectioned in a J-J direction.

The magnetic circuit assembly <NUM> is mounted on the basin stand. Specifically, the magnetic circuit assembly <NUM> is mounted on the third fastening groove <NUM> of the basin stand. The side electrode plate <NUM> of the magnetic circuit assembly <NUM> is mounted on the third fastening groove <NUM>, and the side electrode plate <NUM> may be mounted on the bottom wall surface <NUM> of the third fastening groove <NUM> by bonding. A surface that is of the side electrode plate <NUM> and that faces a same direction as the top surface <NUM> of the basin stand is flush with the bottom wall surface <NUM> of the third fastening groove <NUM>. The central electrode plate <NUM> is accommodated in the third fastening groove <NUM>. In this case, the fourth gaps 4425a, the fifth gaps (not shown in the figure), and the sixth gaps (not shown in the figure) all communicate with the through hole <NUM> of the basin stand.

Refer to <FIG> is a schematic diagram of an exploded structure of the vibration assembly <NUM> in the speaker core <NUM> shown in <FIG>. <FIG> is a schematic diagram of a structure of the vibration assembly <NUM> shown in <FIG> sectioned in a K-K direction.

The vibration assembly <NUM> is located on a side that is of the support assembly <NUM> and that is away from the magnetic circuit assembly <NUM>. The vibration assembly <NUM> includes a sound diaphragm <NUM> and a voice coil <NUM>. The sound diaphragm <NUM> includes a dome <NUM> and a diaphragm <NUM> carrying the dome <NUM>. The dome <NUM> is roughly in a rectangular plate shape. The diaphragm <NUM> is roughly in a rectangular ring shape. The diaphragm <NUM> includes a first fastening part 4438a, a surround part 4438b, and a second fastening part 4438c that are connected in sequence. The first fastening part 4438a is located inside the surround part 4438b, and the second fastening part 4438c is located outside the surround part 4438b. The first fastening part 4438a includes a top surface 4438d and a bottom surface 4438e that are disposed back to back. The dome <NUM> is mounted on the top surface 4438d of the first fastening part 4438a. A cross section of the surround part 4438b is arc-shaped or roughly arc-shaped, and an extension track of the surround part 4438b is a rounded rectangle. The surround part 4438b is concave. To be specific, the surround part 4438b is concave in a direction to the bottom surface 4438e of the first fastening part 4438a. When the surround part 4438b is subject to an external force, the surround part 4438b can deform, so that the first fastening part 4438a and the second fastening part 4438c move relative to each other, and the dome <NUM> and the second fastening part 4438c move relative to each other. The voice coil <NUM> is located on a side that is of the diaphragm <NUM> and that is away from the dome <NUM>. The voice coil <NUM> is roughly in a square ring shape. The voice coil <NUM> is mounted on the bottom surface 4438e of the first fastening part 4438a, the voice coil <NUM> is electrically connected to the mainboard (not shown in the figure), and the voice coil <NUM> receives an audio signal transmitted by the mainboard and drives the sound diaphragm <NUM> to vibrate up and down.

<FIG> is a schematic diagram of a structure of the speaker core <NUM> sectioned in an L-L direction in the speaker module <NUM> shown in <FIG>.

The vibration assembly <NUM> is mounted on the bottom surface <NUM> of the basin stand. Specifically, the second fastening part 4438c of the sound diaphragm <NUM> is mounted on the bottom surface <NUM> of the basin stand, and the second fastening part 4438c may be mounted on the bottom surface <NUM> of the basin stand by bonding. In this case, the voice coil <NUM> passes through the through hole <NUM> of the basin stand, passes through the fourth gap 4425a, the fifth gap (not shown in the figure), and the sixth gap (not shown in the figure), and extends into the first gap 4422a, the second gap (not shown in the figure), and the third gap (not shown in the figure). The magnetic circuit assembly <NUM> provides a magnetic field for vibration of the voice coil <NUM>. When the voice coil <NUM> receives an audio signal transmitted by the mainboard (not shown in the figure), the voice coil <NUM> moves up and down to cut a magnetic line of the magnetic field, and drives the sound diaphragm <NUM> to vibrate.

Refer to <FIG> again. The speaker core <NUM> is mounted on the first enclosure <NUM>. Specifically, the speaker core <NUM> is mounted on a bottom surface <NUM> of the first enclosure <NUM>, and a part of the vibration assembly <NUM> of the speaker core <NUM> extends into the accommodating groove <NUM>. The second fastening part 4438c of the sound diaphragm <NUM> in the vibration assembly <NUM> is mounted on the bottom surface <NUM> of the first enclosure <NUM>, and the second fastening part 4438c of the sound diaphragm <NUM> may be mounted on the bottom surface <NUM> of the first enclosure <NUM> by bonding. The front sound cavity <NUM> is formed between the first enclosure <NUM> and the sound diaphragm <NUM>. To be specific, the bottom wall <NUM>, the first side wall <NUM>, and the sound diaphragm <NUM> jointly form the front sound cavity <NUM> through enclosing. The sound outlet hole <NUM> connects the front sound cavity <NUM> and the outside of the speaker module <NUM>.

In this case, the dome <NUM> of the sound diaphragm <NUM> directly faces the groove <NUM>, to increase vibration space between the dome <NUM> and the first enclosure <NUM>, so that the vibration space between the dome <NUM> and the first enclosure <NUM> is fully used. A distance between the dome <NUM> and a bottom wall surface <NUM> of the groove <NUM> is greater than or equal to a distance between the surround part 4438b and the bottom wall surface <NUM> of the bottom wall <NUM>, so that when the vibration space between the dome <NUM> and the first enclosure <NUM> is fully used, the vibration space between the surround portion 4438b of the diaphragm <NUM> and the first enclosure <NUM> can also be fully used. This helps increase vibration amplitude of the sound diaphragm <NUM>, and improve audio performance of a sound made by the speaker module <NUM>.

The speaker module <NUM> is installed in the overall inner cavity <NUM>. Specifically, the first enclosure <NUM> of the speaker module <NUM> is mounted on the mounting surface <NUM> of the support <NUM>, and the limiting frame <NUM> abuts against a circumferential surface of the speaker module <NUM>, to assist in fastening the speaker module <NUM> and improve mounting stability of the speaker module <NUM> in the overall inner cavity <NUM>. The first enclosure <NUM> of the speaker module <NUM> is partially accommodated in the assembly groove <NUM>. A part that is on the first enclosure <NUM> and that forms the groove <NUM>, that is, the protrusion part <NUM>, is accommodated in the assembly groove <NUM> of the support <NUM>, and the assembly groove <NUM> connects the speaker hole <NUM> and the sound outlet hole <NUM>. In this case, a rear sound cavity <NUM> is formed between the sound diaphragm <NUM> and the rear cover <NUM>.

In the electronic device <NUM> shown in this embodiment, the part that forms the groove <NUM> in the speaker module <NUM> is accommodated in the assembly groove <NUM> of the support <NUM>, so that vibration space between the dome <NUM> and the first enclosure <NUM> is increased in the limited overall inner cavity <NUM> without increasing a thickness of the electronic device <NUM>. This helps increase vibration amplitude of the sound diaphragm <NUM> and improve audio performance of the electronic device <NUM>. In addition, in the electronic device <NUM> shown in this embodiment, the rear sound cavity <NUM> is formed between the sound diaphragm <NUM> and the rear cover <NUM>, so that a second enclosure of the speaker module <NUM> is omitted, and a volume of the speaker module <NUM> is reduced. This helps reduce a volume occupied by the speaker module <NUM> in the overall space <NUM> of the electronic device <NUM>, helps reduce a thickness of the electronic device <NUM>, and implements a thin and light design of the electronic device <NUM>.

Claim 1:
A speaker module (<NUM>), comprising a first enclosure (<NUM>), a speaker core (<NUM>), and a waterproof breathable film (<NUM>), wherein the first enclosure (<NUM>) is provided with an accommodating groove (<NUM>), the speaker core (<NUM>) is mounted on the accommodating groove (<NUM>), the speaker core (<NUM>) comprises a sound diaphragm (<NUM>), a front sound cavity (<NUM>) is formed between the sound diaphragm (<NUM>) and the first enclosure (<NUM>), a rear sound cavity (<NUM>) is on a side that is of the sound diaphragm (<NUM>), and the side that is of the sound diaphragm (<NUM>) is away from the front sound cavity (<NUM>);
the first enclosure (<NUM>) is further provided with a resonant groove (<NUM>), a bottom of the resonant groove (<NUM>) is provided with a communicating hole (<NUM>), the resonant groove (<NUM>) communicates with the front sound cavity (<NUM>) through the communicating hole (<NUM>), and the waterproof breathable film (<NUM>) covers an opening that is of the resonant groove (<NUM>) and that faces the rear sound cavity (<NUM>), to isolate the resonant groove (<NUM>) from the rear sound cavity (<NUM>); and
the first enclosure (<NUM>) is further provided with a groove (<NUM>), an opening of the groove (<NUM>) is located on a bottom wall surface of the accommodating groove (<NUM>);
characterized in that
the sound diaphragm (<NUM>) comprises a dome (<NUM>) and a diaphragm (<NUM>) bearing the dome (<NUM>), and the dome (<NUM>) directly faces the groove (<NUM>);
the dome (<NUM>) is in a rectangular plate shape; and
the diaphragm (<NUM>) is in a rectangular ring shape.