Electronic devices

Abstract

The present application provides an electronic device having a sound cavity and a sound outlet; wherein the sound cavity at least includes a front cavity, the front cavity has an opening for installing a speaker, the front cavity is located in the sound output direction of the speaker, the front cavity at least includes an original cavity portion and a sound output channel, the original cavity portion is directly opposite to the speaker, the sound output channel is connected to the original cavity portion, and extends along a strip path toward the side of the speaker, the sound outlet is connected to the extension end of the sound output channel away from the original cavity portion, and the sound output channel is staggered with the speaker in the sound output direction of the speaker. The electronic device reduces the resonant frequency of the speaker system by improving the structure of the front cavity, thereby improving the frequency response sensitivity of the speaker system in the low-frequency band, and provides a new means to improve the low-frequency performance of the speaker system. In practical applications, electronic devices with different resonant frequencies can be set according to the new means to meet users' different needs for bass performance.

Description

Technical Field

[0001] The present application relates to the technical field of loudspeaker front cavity design, and in particular to an electronic device. Background Art

[0002] For electronic devices such as mobile phones, laptops or tablets, the quality of sound effects has become a key indicator for people to choose products, and the low-frequency performance of the speaker system in electronic devices is an important consideration for judging the quality of sound effects, and has a crucial impact on user experience. However, the current means of improving low-frequency performance are generally to improve the performance of the speaker itself or increase the back cavity space, but the above two methods have very limited adjustment space and benefits for the low-frequency performance of the speaker. Summary of the invention

[0003] The present application provides an electronic device, which solves the problem that the adjustment space and benefits of low-frequency performance of current electronic devices are very limited.

[0004] In order to achieve the above objectives, this application adopts the following technical solutions:

[0005] In a first aspect, a shell is provided for mounting a speaker, the shell having a sound cavity and a sound outlet; wherein the sound cavity at least comprises a front cavity, the front cavity having a first opening for mounting the speaker, the front cavity at least comprising an original cavity portion and a sound outlet channel, the original cavity portion being opposite to the first opening and being located in the sound outlet direction of the speaker, a second opening being provided on the side wall of the original cavity portion, the sound outlet channel being connected to the second opening and extending toward the side of the original cavity portion, the sound outlet channel being connected to an extension end of the sound outlet channel away from the second opening, and the sound outlet channel being staggered with the speaker in the sound outlet direction of the speaker. By adding a sound outlet channel, the shell increases the sound quality of the front cavity, and since the resonance frequency f of the speaker system is inversely proportional to the square root of the sound quality of the front cavity, the resonance frequency f of the speaker system is reduced, the frequency response sensitivity of the speaker system in the low-frequency band is improved, and the low-frequency gain of the speaker system is improved. In practical applications, shells with different resonant frequencies can be set according to the new method to meet users' different needs for bass performance. There is more room for adjustment of low-frequency performance, higher setting flexibility, lower cost, and higher low-frequency performance benefits.

[0006] As one embodiment of the first aspect, the sound cavity further includes a rear cavity connected to the first opening, and the front cavity and the rear cavity are separated by a diaphragm of the speaker. In this way, the housing has both a front cavity and a rear cavity, forming a complete speaker system, and it is not necessary to use other structural parts of the electronic device to surround the sound cavity, which is easy to assemble.

[0007] As one of the embodiments of the first aspect, the plane where the extension path of the sound output channel is located is perpendicular to the sound output direction of the speaker to facilitate processing.

[0008] As one of the embodiments of the first aspect, the opening direction of the sound outlet is perpendicular to the sound outlet direction of the speaker so as to be in the same direction as the playback hole of the electronic device.

[0009] As one of the embodiments of the first aspect, the sound outlet channel extends along a straight path to reduce acoustic resistance.

[0010] As one of the embodiments of the first aspect, the inner wall of the sound outlet channel has a smooth transition to reduce acoustic resistance.

[0011] As one of the embodiments of the first aspect, the sound outlet channel has at least a bending portion, and the bending portion extends along a bending path so as to adapt to a non-linear direction of an installation gap in the electronic device.

[0012] As one of the embodiments of the first aspect, the sound output channel has at least a uniform section, and the cross-sectional area of ​​the uniform section remains unchanged along the extension direction of the sound output channel, so that the sound can be stably propagated; and / or,

[0013] The sound output channel has at least a gradually expanding section, and the cross-sectional area of ​​the gradually expanding section gradually increases along the extension direction of the sound output channel to amplify the sound effect; and / or,

[0014] The sound outlet channel has at least a tapered section, and the cross-sectional area of ​​the tapered section gradually decreases along the extension direction of the sound outlet channel to increase the sound quality.

[0015] As one of the embodiments of the first aspect, the sound cavity further includes at least one resonance cavity portion, and the resonance cavity portion is connected to the sound output channel. The speaker system can generate a resonance peak in the mid-frequency band of the frequency response curve by setting the resonance cavity portion. The existence of the resonance peak can increase the sound intensity in the frequency band between the resonance frequency of the speaker system and the frequency where the peak of the resonance peak is located, thereby improving the sound intensity in the mid-frequency band of the speaker system.

[0016] As one of the embodiments of the first aspect, the resonance cavity portion is embedded in the sound output channel, which may be equivalent to a region where the cross-sectional area of ​​the sound output channel suddenly increases. The resonance cavity portion may improve the sound intensity in the mid-frequency band of the speaker system.

[0017] As one of the embodiments of the first aspect, the resonance cavity portion is connected to the inner wall of the sound output channel through a connecting channel, and the cross-sectional area of ​​the connecting channel is smaller than the cross-sectional area of ​​the resonance cavity. The resonance cavity portion can improve the sound intensity of the mid-frequency band of the speaker system.

[0018] As one of the embodiments of the first aspect, a plurality of the resonance cavity portions are provided, and the plurality of the resonance cavity portions are staggered in the extension direction of the sound output channel.

[0019] As one of the embodiments of the first aspect, a damping structure for increasing acoustic resistance is provided on the shell to reduce the peak intensity of the resonance peak.

[0020] In a second aspect, a speaker system is provided, characterized in that it comprises a speaker and a housing as described in the above embodiment, wherein the speaker is arranged at the first opening and the first opening is sealed by a diaphragm, and the speaker can emit sound toward the original cavity. The speaker system improves the frequency response sensitivity of the low-frequency band by setting the sound outlet channel in the housing, thereby improving the low-frequency performance.

[0021] As one of the embodiments of the second aspect, the shell includes an upper shell and a lower shell that are connected to each other, the upper shell has the sound cavity, the sound cavity has an installation port, the lower shell covers the installation port, and the setting of the installation port facilitates the installation of the speaker in the sound cavity.

[0022] In a third aspect, an electronic device is provided, characterized in that it includes a speaker and a housing as described in the above embodiment, wherein the speaker is arranged at the first opening and the first opening is sealed by a diaphragm, and the speaker can emit sound toward the original cavity. The electronic device forms a sound cavity through the housing, and a speaker system is no longer separately provided.

[0023] As one of the embodiments of the third aspect, the housing includes a screen assembly, a middle frame, a back cover and internal structural parts connected in sequence, and the screen assembly, the middle frame, the back cover and the internal structural parts are jointly arranged to form the front cavity. In this way, the installation gap inside the electronic device can be fully utilized, and the installation gap can be fully used to form the front cavity, thereby increasing the space available for setting the sound outlet channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a cross-sectional view of a current general loudspeaker system;

[0025] Figure 2 A schematic diagram of the structure of a speaker system provided in an embodiment of the present application;

[0026] Figure 3 for Figure 2 A cross-sectional view of the speaker system provided in the thickness direction;

[0027] Figure 4 for Figure 2 A cross-sectional view of a housing of a loudspeaker system provided in the thickness direction;

[0028] Figure 5A cross-sectional view of a housing provided in an embodiment of the present application in a direction perpendicular to the thickness;

[0029] Figure 6 A cross-sectional view of a housing provided in another embodiment of the present application in a direction perpendicular to the thickness

[0030] Figure 7 A three-dimensional structural diagram of a speaker system provided in one embodiment of the present application;

[0031] Figure 8 for Figure 7 An exploded view of the loudspeaker system provided in;

[0032] Fig. 9 for Figure 7 A cross-sectional view of a speaker system provided in;

[0033] Fig.10 for Figure 7 A cross-sectional view of the loudspeaker system provided in a direction perpendicular to the thickness;

[0034] Fig.11 for Figure 7 The frequency response diagram of the speaker system and the current common speaker system provided in;

[0035] Fig.12 A cross-sectional view of a housing provided in an embodiment of the present application in a direction perpendicular to the thickness, wherein the sound cavity includes a resonance cavity portion;

[0036] Fig.13 for Fig.12 The frequency response diagram of the speaker system and the current common speaker system provided in;

[0037] Fig.14 A three-dimensional structural diagram of a speaker system provided by an embodiment of the present application, wherein the housing only includes a front cavity;

[0038] Fig.15 for Fig.14 An exploded view of the loudspeaker system provided in;

[0039] Fig.16 for Fig.14 A cross-sectional view of the loudspeaker system provided in a direction perpendicular to the thickness;

[0040] Fig.17 A cross-sectional view of a housing provided in another embodiment of the present application in a direction perpendicular to the thickness;

[0041] Fig.18 A three-dimensional structural diagram of an electronic device provided in one embodiment of the present application;

[0042] Fig.19 for Fig.18 An exploded view of the electronic equipment provided in;

[0043] Fig. 20 for Fig.18 A cross-sectional view of an electronic device is provided in FIG.

[0044] Description of reference numerals:

[0045] 100', housing; 101', front cavity; 102', rear cavity; 103', sound outlet; 900', speaker; 901', diaphragm;

[0046] 100, housing; 101, sound cavity; 1011, mounting port; 102, sound outlet; 103, front cavity; 1031, original cavity; 1031a, original cavity bottom wall; 1031b, original cavity side wall; 1032, sound outlet channel; 1032a, sound outlet top wall; 1032b, sound outlet bottom wall; 1032c, sound outlet side wall; 111, bending portion; 10321, uniform section; 10321a, first uniform section; 10321b, second uniform section; 10321c, third uniform section; 103 22. Gradual expansion section; 10323. Gradual contraction section; 104. First opening; 105. Second opening; 106. Back cavity; 107. Resonance cavity part; 107a. Resonance bottom wall; 107b. Resonance side wall; 108. Connection channel; 109. Playback hole; 11. Sound outlet pipe; 12. Installation structure; 13. Upper shell; 14. Lower shell; 15. Reinforcement column; 16. Screen assembly; 17. Middle frame; 18. Back cover; 19. Baffle; 900. Speaker; 901. Diaphragm; 200. Speaker system. DETAILED DESCRIPTION

[0047] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0048] In the description of the present application, it should be understood that the terms "inside", "outside", "top", "bottom", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0049] In order to facilitate the clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first", "second", "third" and the like are used to distinguish the same items or similar items with substantially the same functions and effects. For example, the first limiting portion and the second limiting portion are only used to distinguish different limiting portions, and do not limit their order. Those skilled in the art can understand that the words "first", "second", "third" and the like do not limit the quantity and execution order, and the words "first", "second", "third" and the like do not necessarily limit them to be different.

[0050] It should be noted that, in this application, the words "as one embodiment" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "as one embodiment" or "for example" in this application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the words "as one embodiment" or "for example" is intended to present the relevant concepts in a specific way.

[0051] In this application, unless otherwise clearly specified and limited, the terms "connected", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] To facilitate the understanding of the readers, the following is an explanation of the terms used in this application:

[0053] Sound quality: The resonant mass of the sound field reacting on the sound source, that is, the sound mass.

[0054] Acoustic compliance: The movement of air in a cavity causes a change in pressure inside the cavity. This pressure change reacts on the air in the cavity, appearing as an "air spring". In acoustics, this "air spring" is acoustic compliance, which is similar to force compliance in mechanics.

[0055] Resonant Frequency: The resonant frequency at which a speaker system is designed.

[0056] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0057] For electronic devices such as mobile phones, laptops or tablets, the quality of sound effects has become a key indicator for people to choose products. The sound effects of electronic devices are determined by the speaker system in the electronic devices, and the low-frequency performance of the speaker system is the main consideration for judging the quality of sound effects, which has a crucial impact on user experience.

[0058] Frequencies below 1000Hz are generally called low-frequency bands. In order to improve the low-frequency performance of the speaker system, there are currently two commonly used methods: one is to improve the performance of the speaker itself, and the other is to expand the back cavity space of the speaker system. The former method has higher performance requirements for the speaker itself. Due to material and process limitations, this method not only has limited adjustment space and benefits for the low-frequency performance of the speaker system, but also has a low cost-effectiveness. Therefore, the latter method is often used, that is, to improve the low-frequency performance of the speaker system by expanding the back cavity space of the speaker system.

[0059] See also Figure 1 The current common speaker system includes a shell 100' and a speaker 900'. The shell 100' forms a sound cavity. The speaker 900' is arranged in the sound cavity. The diaphragm 901' of the speaker 900' divides the sound cavity into a front cavity 101' and a rear cavity 102'. The front cavity 101' and the rear cavity 102' are arranged along the thickness direction of the electronic device. The front cavity 101' is located in the sound output direction of the speaker 900'. The front cavity 101' is formed by a groove-like structure. The groove-like structure has a groove bottom wall and groove side walls arranged around the groove bottom wall. The diaphragm 901' of the speaker 900' seals the groove formed by the groove side walls. The diaphragm 901' faces the groove bottom wall of the groove-like structure. The front cavity 101' is arranged opposite to the speaker 900' in the sound output direction of the speaker 900'. A sound outlet hole 103' is opened on the groove side wall. The speaker 900' emits sound toward the front cavity 101', and the sound is transmitted through the sound outlet hole 103'. In order to improve the low-frequency performance of the speaker system, the space of the rear cavity 102 ′ may be enlarged by increasing the volume of the rear cavity 102 ′ or filling the rear cavity 102 ′ with sound-absorbing particles (Bass).

[0060] After the speaker system is installed in the electronic device, the front cavity 101' is adjacent to the playback hole of the electronic device so that the sound emitted from the sound outlet 103' is transmitted directly to the playback hole. The volume of the front cavity is limited by the amplitude and size of the speaker. Generally, the volume of the front cavity is set to be smaller as long as the reliability requirements are met. Compared with the front cavity 101', the rear cavity 102' is closer to the central area of ​​the electronic device. The volume of the rear cavity 102' is more restricted by the overall architecture and internal structural parts of the electronic device. In practical applications, it is often impossible to increase the volume of the rear cavity 102' as needed. Filling the sound-absorbing particles not only increases the processing cost, but also may cause pollution to the speaker 900'. For this purpose, a protective cover needs to be set for the speaker 900', which increases the difficulty of the process, and the expansion effect of the sound-absorbing particles is also limited. It can be seen that although the means of expanding the space of the rear cavity 102' is better than the means of improving the performance of the speaker 900' itself, the adjustment space and performance benefits for the low-frequency performance of the speaker system are also very limited.

[0061] See also Figure 2 and Figure 3 The present application provides a housing 100, a speaker system 200 and an electronic device. The speaker system 200 includes a speaker 900 and a housing 100. The electronic device is an electronic device provided with the speaker system 200, or an electronic device provided with the speaker 900 and a housing 100 formed by the electronic device's own structural parts. The housing 100 reduces the resonant frequency of the speaker system 200 by improving the structure of the front cavity 103, thereby improving the low-frequency response sensitivity of the speaker system 200, and provides a new means for improving the low-frequency performance of the speaker system 200. In practical applications, housings 100 with different resonant frequencies can be set according to the new means to meet different user requirements for bass performance, with greater adjustment space for low-frequency performance, higher setting flexibility, lower cost, and higher low-frequency performance benefits.

[0062] The following embodiments are described by assuming that the electronic device is an electronic device provided with a speaker system 200, and the electronic device plays audio through the speaker system 200. The electronic device includes, but is not limited to, a candy-bar mobile phone, a folding mobile phone, an e-reader, a laptop computer, a desktop computer, a tablet computer, a PDA (Personal Digital Assistant), a smart watch, a calculator, or a game controller.

[0063] Taking the electronic device as a tablet computer as an example, the electronic device includes a screen assembly, a middle frame, a back cover and a control module connected in sequence. The screen assembly and the back cover are respectively arranged on both sides of the middle frame. The screen assembly, the middle frame and the back cover are jointly arranged to form a middle cavity. The speaker system 200 and the control module are both arranged in the middle cavity and are both connected to the middle frame. The control module is used to control the screen assembly to display images and control the speaker system 200 to play audio. The control module includes but is not limited to a main board, devices and structural parts arranged on the main board, etc. A playback hole connected to the middle cavity is opened on the middle frame. The speaker system 200 can play audio toward the playback hole, and the audio is transmitted out of the electronic device through the playback hole.

[0064] See also Figure 3 The speaker system 200 includes a speaker 900 and a housing 100. The speaker 900 is installed on the housing 100. The speaker 900 is used to emit sound. The housing 100 is used to improve the frequency response sensitivity of the low-frequency band and provide a resonant frequency of the speaker system 200 that meets user requirements.

[0065] The loudspeaker 900 includes a frame, a magnetic circuit assembly, a diaphragm 901 and a voice coil. The magnetic circuit assembly and the diaphragm 901 are respectively connected to the two sides of the frame. The magnetic circuit assembly, the diaphragm 901 and the frame are together arranged to form a driving cavity. The voice coil is connected to the side of the diaphragm 901 facing the magnetic circuit assembly and is located in the driving cavity. After being energized, the voice coil can generate a magnetic field through electromagnetic induction and reciprocate under the magnetic force of the magnetic circuit assembly to drive the diaphragm 901 to vibrate. The diaphragm 901 vibrates to emit sound. The diaphragm 901 of the loudspeaker 900 faces the sound output direction of the loudspeaker 900.

[0066] See also Figure 3 and Figure 4 The housing 100 has a sound cavity 101 and a sound outlet 102 connected to the sound cavity 101 .

[0067] The sound cavity 101 at least includes a front cavity 103 having a first opening 104 for installing the speaker 900. When the speaker 900 is assembled with the housing 100, the speaker 900 can be installed at the first opening 104, and the speaker 900 seals the first opening 104 through the diaphragm 901.

[0068] The front cavity 103 at least includes an original cavity portion 1031 and a sound outlet channel 1032. The original cavity portion 1031 is opposite to the first opening 104 and is located in the sound outlet direction of the speaker 900. The inner wall of the original cavity portion 1031 has an original cavity bottom wall 1031a and an original cavity side wall 1031b arranged around the original cavity bottom wall 1031a. The original cavity side wall 1031b is the side wall of the original cavity portion 1031. The original cavity side wall 1031b can surround the first opening 104. In other words, the original cavity portion 1031 is a groove-shaped structure, and the first opening 104 is the notch of the groove-shaped structure. The second opening 105 is opened on the original cavity side wall 1031b of the original cavity portion 1031. The sound outlet channel 1032 is connected to the second opening 105 and extends toward the side of the original cavity portion 1031. The side of the original cavity 1031 is the direction of the original cavity side wall 1031b of the original cavity 1031. The sound outlet hole 102 is connected to the extension end of the sound outlet channel 1032 away from the second opening 105. The sound outlet channel 1032 is staggered with the speaker 900 in the sound outlet direction of the speaker 900.

[0069] It can be understood that the sound outlet channel 1032 has a first extension end and a second extension end, and the sound outlet channel 1032 extends from the first extension end toward the second extension end, and the extension path of the sound outlet channel 1032 from the first extension end to the second extension end is in a strip shape. The first extension end of the sound outlet channel 1032 is connected to the second opening 105, and the second extension end is the extension end of the sound outlet channel 1032 away from the second opening 105. The second extension end is located on the side of the original cavity 1031, and the sound outlet hole 102 is connected to the second extension end. After the speaker 900 is installed in the first opening 104, the original cavity bottom wall 1031a of the original cavity 1031 is directly opposite to the diaphragm 901 of the speaker 900, that is, the original cavity 1031 is overlapped with the speaker 900 in the sound output direction of the speaker 900, and the sound outlet channel 1032 is staggered with the speaker 900 in the sound output direction of the speaker 900. The speaker 900 emits sound toward the original cavity 1031, and the sound outlet channel 1032 can guide the sound in the original cavity 1031 to propagate from the first extension end to the second extension end, and finally to be transmitted from the sound outlet 102. Among them, the wall surface of the original cavity bottom wall 1031a of the original cavity 1031 can be a plane, and is roughly parallel to the diaphragm 901 of the speaker 900, or it can be a curved surface, a folded surface or a step structure, which is not limited here, and the cross-sectional shape of the original cavity side wall 1031b includes but is not limited to a circle, a square or an irregular shape.

[0070] It should be noted that the shape of the extension path of the sound outlet channel 1032 includes but is not limited to a straight line, a curve, a broken line, etc. The extension path may extend in the same plane, or may not be limited to extending in the same plane, as long as it is within the shell 100, and there is no limitation here.

[0071] The above-mentioned original cavity 1031 is equivalent to the front cavity 103 in the current general speaker system 200. Compared with the front cavity 103 of the shell 100 in the current general speaker system 200, the front cavity 103 of the shell 100 in this embodiment is additionally provided with a sound outlet channel 1032. The sound emitted by the speaker 900 toward the original cavity 1031 needs to pass through the sound outlet channel 1032 and then be transmitted from the sound outlet hole 102.

[0072] The sound mass m in the front cavity 103 of the loudspeaker system is obtained according to the following formula:

[0073]

[0074] Among them, ρ is the air density, l is the extension length of the front cavity 103, s is the cross-sectional area of ​​the front cavity 103, the extension length of the front cavity 103 is the extension length in the sound propagation direction in the front cavity 103, and the cross-sectional area of ​​the front cavity 103 is the cross-sectional area perpendicular to the extension direction of the front cavity 103.

[0075] In this embodiment, the extension length of the front cavity 103 is extended by the provision of the sound outlet channel 1032, that is, the l value is increased, so the sound mass m of the front cavity 103 of the shell 100 is increased.

[0076] The resonant frequency f of the loudspeaker system is obtained according to the following formula:

[0077]

[0078] Where c is the acoustic compliance and m is the system equivalent mass including the acoustic mass of the air load.

[0079] According to the above formula, it can be seen that the resonance frequency f of the speaker system 200 is inversely proportional to the square root of the sound mass m of the front cavity 103. When the sound mass m of the front cavity 103 increases, the resonance frequency f of the speaker system 200 decreases. In other words, the housing 100 reduces the resonance frequency f of the speaker system 200 by adding the sound outlet channel 1032, thereby improving the frequency response sensitivity of the speaker system 200 in the low-frequency band and achieving an improvement in the low-frequency gain of the speaker system 200. In this way, the present embodiment adjusts the low-frequency performance of the speaker system 200 by changing the extension length of the front cavity 103 of the housing 100.

[0080] Specifically, the relevant formula of the resonant frequency f of the speaker system 200 can be changed to:

[0081]

[0082] Among them, f0 is the resonant frequency of the speaker system 200 without the sound outlet channel 1032 , Δf is the frequency change value of the resonant frequency of the speaker system 200 , m0 is the system equivalent mass including the sound mass of the original cavity 1031 , and Δm is the sound mass of the sound outlet channel 1032 .

[0083] In the above formula, f0 and m0 are constant values, and the frequency change value Δf of the resonant frequency of the speaker system 200 is only related to the sound mass Δm of the sound output channel 1032, wherein Δf is a negative value when f decreases. The larger Δm is, the smaller f is, and the larger the absolute value of Δf is, that is, the greater the decrease in the resonant frequency f of the speaker system 200 is. Therefore, the resonant frequency of the speaker system 200 can be adjusted by adjusting the size of Δm. Among them, Δ can be obtained according to the following formula:

[0084]

[0085] Wherein, ρ is the air density, l is the extension length of the sound outlet channel 1032 , and s is the cross-sectional area of ​​the sound outlet channel 1032 .

[0086] It can be seen from the formula that the sound mass Δm of the sound outlet channel 1032 is proportional to the length l of the sound outlet channel 1032 and inversely proportional to the cross-sectional area s of the sound outlet channel 1032. In order to increase the sound mass Δm of the sound outlet channel 1032, it can be achieved by reducing the cross-sectional area s of the sound outlet channel 1032 or increasing the length l of the sound outlet channel 1032.

[0087] However, if the cross-sectional area s of the sound outlet channel 1032 is reduced, the acoustic boundaries on the two opposite sides of the inner wall of the sound outlet channel 1032 will be brought closer, increasing the acoustic resistance when the sound passes through the sound outlet channel 1032, resulting in a decrease in the performance benefit of the speaker system 200. Therefore, in practical applications, the cross-sectional area s of the sound outlet channel 1032 is generally not adjusted, but the sound mass Δm of the sound outlet channel 1032 is adjusted by adjusting the length l of the sound outlet channel 1032, thereby achieving the adjustment of the resonant frequency of the speaker system 200.

[0088] In actual production, the problem of how to improve the low-frequency performance of the speaker system 200 can be transformed into the problem of how to reduce the resonant frequency of the speaker system 200. In order to meet the resonant frequency of the speaker system 200 required by the user for the low-frequency performance requirements, after determining the resonant frequency f or the frequency change value Δf of the speaker system 200 required to meet the user's low-frequency performance requirements, the required sound mass Δm of the sound output channel 1032 can be calculated, and then the required length l of the sound output channel 1032 can be calculated according to the sound mass Δm of the sound output channel 1032. In this way, the resonant frequency of the speaker system 200 can be reduced to the required resonant frequency by adding a sound output channel 1032 with a corresponding extended length, thereby meeting the different requirements of the user for the low-frequency performance of the speaker system 200.

[0089] In summary, the housing 100 improves the structure of the front cavity 103 by adding a sound outlet channel 1032, thereby improving the low-frequency performance of the speaker system 200 and providing a new means for improving the low-frequency performance. The adjustment of the resonant frequency of the speaker system 200 can be achieved by setting sound outlet channels 1032 of different lengths, thereby increasing the adjustment space and improving the controllability of the low-frequency performance adjustment. Since the front cavity 103 is closer to the edge of the electronic device and farther away from the middle area of ​​the electronic device than the rear cavity, more internal structural parts can be avoided. Therefore, the available space of the sound outlet channel 1032 is larger than that of the rear cavity, and the direction of the extension path of the sound outlet channel 1032 can be arranged according to the distribution of the available space in the electronic device, thereby improving the flexibility and practicality of the setting of the sound outlet channel 1032 and being low-cost.

[0090] It should be noted that after the other components and structural parts of the electronic device are assembled, the area near the playback hole is the installation area of ​​the speaker system 200 under normal circumstances. Since the installation area is adjacent to the playback hole, although the installation space is larger than the space that can be set in the back cavity, the space left for the sound output channel 1032 is still very limited. To solve this problem, the installation area of ​​the speaker system 200 can be extended toward the inside of the electronic device. At this time, the extension path of the sound output channel 1032 can make full use of the installation gap between the components and structural parts inside the electronic device. It can be understood that there is generally an installation gap between the components and structural parts inside the electronic device that is connected to the playback hole. The installation gap is the space that can be set for setting the sound output channel 1032. The sound output hole 102 of the housing 100 can be close to and directly opposite the playback hole of the electronic device. In order to increase the extension length of the sound outlet channel 1032, the sound outlet channel 1032 of the housing 100 can be adapted to the installation gap and extend along the extension path of the installation gap, and the speaker 900 is arranged at the inner end of the installation gap, or the sound outlet channel 1032 is coiled or bent in the installation gap. At this time, the sound emitted by the speaker 900 toward the original cavity 1031 is transmitted through the sound outlet channel 1032 extending along the extension path of the above-mentioned installation gap, and finally transmitted from the playback hole through the sound outlet hole 102. In this way, the housing 100 makes full use of the remaining space inside the electronic device to extend the length of the sound outlet channel 1032, which is more cost-effective.

[0091] See also Figure 4 In order to save materials and save space occupied by the housing 100, the housing 100 has a tubular sound outlet pipe 11, which is formed by bending a plate and surrounding a sound outlet channel 1032. For ease of processing, the sound outlet pipe 11 is located on the same plane, that is, the extension path of the sound outlet channel 1032 is located on the same plane.

[0092] Since the various structural components of the electronic device are generally stacked in the thickness direction, the extension paths of the installation gaps formed between the various components and structural components are located on the same plane, and the plane where they are located is perpendicular to the thickness direction of the electronic device. In order to adapt to the above-mentioned installation gap, the plane where the sound outlet tube 11 is located is also perpendicular to the thickness direction of the electronic device, that is, the plane where the extension path of the sound outlet channel 1032 is located is perpendicular to the thickness direction of the speaker 900.

[0093] For example, see Figure 5The sound outlet channel 1032 has at least one bending portion 111, and the bending portion 111 extends along a bending path. The bending portion 111 can be used to avoid other devices or structural parts in the electronic device, or simply to extend the extension length of the sound outlet channel 1032. In practical applications, bending portions 111 of different numbers and bending degrees can be set according to the extension path and space size of the installation gap in the electronic setting. It should be noted that the other parts of the sound outlet channel 1032 except the bending portion 111 can extend along a straight line, and the sound outlet channel 1032 can also be formed by only a plurality of bending portions 111 connected in sequence.

[0094] When there is an angle on the inner wall of the sound outlet channel 1032, the two walls forming the angle are too close to each other, which will increase the acoustic resistance. To solve this problem, please refer to Figure 5 , the angles on the inner wall of the sound outlet channel 1032 can be set to be rounded. Correspondingly, the angles formed by the corners of each bending portion 111 can also be set to be rounded to minimize the acoustic resistance of the bending portion 111.

[0095] However, if there are too many bends 111 in the sound outlet channel 1032, the friction and reaction of the wall of the sound outlet channel 1032 to the sound will still increase, consuming the energy of the sound wave, increasing the acoustic resistance during the sound propagation process, and even generating noise, thereby reducing the performance benefits of the sound. Therefore, the sound outlet channel 1032 can be set to extend along a straight line as much as possible, that is, no or fewer bends 111 are set. For this reason, when setting other components or structural parts inside the electronic device, the setting positions of other components and structural parts can be adjusted to reserve a mounting gap extending along a straight line for the housing 100.

[0096] For example, see Figure 6 The sound outlet channel 1032 has a uniform section 10321, the cross-sectional area of ​​which does not change along the sound propagation direction, and accordingly, the cross-sectional area of ​​the portion of the sound outlet tube 11 corresponding to the uniform section 10321 does not change, so as to facilitate processing. The uniform section 10321 can achieve stable sound propagation.

[0097] For example, see Figure 6 The sound outlet channel 1032 has a gradually expanding section 10322, and the cross-sectional area of ​​the gradually expanding section 10322 gradually increases along the propagation direction of the sound. The gradual increase in the cross-sectional area of ​​the sound outlet channel 1032 can reduce the acoustic resistance and achieve a sound amplification effect.

[0098] For example, see Figure 6 The sound outlet channel 1032 has a tapered section 10323, and the cross-sectional area of ​​the tapered section 10323 gradually decreases along the sound propagation direction. The gradual reduction of the cross-sectional area of ​​the sound outlet channel 1032 can increase the sound quality, but it will also increase the acoustic resistance to a certain extent.

[0099] It should be noted that the above-mentioned sound propagation direction is the extension direction of the sound outlet channel 1032 from the first extension end to the second extension end. Although the gradually expanding section 10322 reduces the acoustic resistance, it reduces the sound quality. Although the gradually contracting section 10323 can increase the sound quality, it will also increase the acoustic resistance to a certain extent. The two functions are opposite. In practical applications, the sound outlet tube 11 can be adapted to the installation gap, and the number, position and extension length of the uniform section 10321, the gradually expanding section 10322 and the gradually contracting section 10323 in the sound outlet channel 1032 can be adjusted according to the size of the installation gap in the electronic device and the requirements for low-frequency performance. The above-mentioned uniform section 10321, the gradually expanding section 10322 and the gradually contracting section 10323 can extend along a straight line or along a curved path. In other words, a bending portion 111 can be set in the above-mentioned uniform section 10321, the gradually expanding section 10322 and the gradually contracting section 10323.

[0100] As an example, see Figure 7 and Figure 8 The sound cavity 101 includes a front cavity 103 and a rear cavity 106 connected to the first opening 104. The housing 100 may be provided with a mounting structure 12 in the sound cavity 101. The mounting structure 12 is used to mount the speaker 900. The speaker 900 is connected to the housing 100 through the mounting structure 12 and seals the first opening 104. It can be understood that the mounting structure 12 includes but is not limited to a mounting step for abutting the speaker 900, a mounting frame for sleeved speaker 900, or a mounting groove for accommodating the speaker 900. There is no limitation here, as long as the speaker 900 can be positioned. The front cavity 103 and the rear cavity 106 are separated by the diaphragm 901 of the speaker 900. That is, after the speaker 900 is installed, the diaphragm 901 isolates the front cavity 103 and the rear cavity 106 to avoid ventilation between the front cavity 103 and the rear cavity 106. Among them, the driving cavity is located in the rear cavity 106. The speaker 900 emits sound toward the front cavity 103 , and the sound is transmitted out of the housing 100 through the sound outlet hole 102 .

[0101] As electronic devices become thinner and lighter, the housing 100 also becomes thinner and lighter, forming a flat structure. In this embodiment, see Figure 8 and Fig. 9The housing 100 includes an upper housing 13 and a lower housing 14. The upper housing 13 has a sound cavity 101. The mounting structure 12 is disposed in the upper housing 13. The rear cavity 106 has a mounting opening 1011. The speaker 900 can be placed in the sound cavity 101 through the mounting opening 1011 and connected to the mounting structure 12. The lower housing 14 covers the mounting opening 1011 to seal the rear cavity 106. The housing 100 has a thickness direction, which is the direction in which the housing 100 needs to be thin and light. The front cavity 103 and the rear cavity 106 are arranged along the thickness direction of the housing 100. To adapt to the structure of the housing 100, the speaker 900 in the housing 100 is generally a flat structure. To save space, the thickness direction of the speaker 900 is the same as the thickness direction of the shell 100. The magnetic circuit assembly, the frame, and the diaphragm 901 are arranged in sequence along the thickness direction of the speaker 900. The original cavity 1031 and the rear cavity 106 are arranged along the thickness direction of the speaker 900, and the sound output direction of the speaker 900 is also its thickness direction.

[0102] In other embodiments, the sound cavity 101 may only include the front cavity 103, and the speaker 900 may be directly mounted on the shell 100 or mounted on the shell 100 through other structural components, as long as the diaphragm 901 of the speaker 900 can seal the first opening 104. The rear cavity 106 of the speaker system 200 is formed by other structural components of the electronic device and is not arranged in the shell 100.

[0103] In the embodiment shown in the figure, see Fig. 9 and Fig.10 The primary cavity side wall 1031b of the primary cavity portion 1031 includes four primary cavity partition walls connected end to end, each primary cavity partition wall is rectangular, and the primary cavity bottom wall 1031a is also rectangular, that is, the two primary cavity side walls 1031b are equal in size and parallel. The second opening 105 is opened on one of the primary cavity partition walls, and the second opening 105 is rectangular.

[0104] The sound outlet channel 1032 extends in a straight line, and the cross section of the sound outlet channel 1032 perpendicular to the extension direction thereof is rectangular. The inner wall of the sound outlet channel 1032 has a sound outlet top wall 1032a, a sound outlet bottom wall 1032b, and two sound outlet side walls 1032c. The sound outlet bottom wall 1032b and the sound outlet top wall 1032a are arranged opposite to each other in the thickness direction of the housing 100, and the distance between the sound outlet top wall 1032a and the sound outlet bottom wall 1032b is the height of the sound outlet channel 1032. Both the sound outlet side walls 1032c are connected to the top wall and the bottom wall of the sound outlet channel 1032, and the two sound outlet side walls 1032c are arranged opposite to each other, and the distance between the two sound outlet side walls 1032c is the width of the sound outlet channel 1032. The port of the sound outlet channel 1032 is directly connected to the second opening 105. The port of the sound outlet channel 1032 is located at the first extension end of the sound outlet channel 1032 and is formed by the sound outlet top wall 1032a, the sound outlet bottom wall 1032b and the two sound outlet side walls 1032c. The port of the sound outlet channel 1032 is adapted to the second opening 105. In other embodiments, the second opening 105 may also be connected to the sound outlet side wall 1032c of the sound outlet channel 1032, which is not limited here.

[0105] See also Fig.10 The size of the second opening 105 can be smaller than the size of the original cavity partition wall where it is located, so as to reduce the space occupied by the sound outlet channel 1032.

[0106] However, at this time, the remaining wall surface of the original cavity partition where the second opening 105 is located will block the sound from propagating toward the sound outlet channel 1032. Therefore, the size of the second opening 105 can be set to be the same as the size of the original cavity partition where it is located, that is, the height of the second opening 105 in the height direction of the sound outlet channel 1032 is equal to the distance between the diaphragm 901 of the speaker 900 and the bottom wall 1031a of the original cavity, and the width of the second opening 105 in the width direction of the sound outlet channel 1032 is equal to the distance between the original cavity partition walls on both sides thereof, so as to ensure that the sound can be output smoothly at the second opening 105 and reduce the acoustic resistance of the sound at the second opening 105. At this time, the original cavity side wall 1031b of the original cavity part 1031 is equivalent to having only three original cavity partition walls, the two sound-outgoing side walls 1032c are respectively connected to the original cavity side walls 1031b located on both sides of the second opening 105, the sound-outgoing bottom wall 1032b is connected to the original cavity bottom wall 1031a, and the sound-outgoing top wall 1032a is roughly flush with the diaphragm 901 of the speaker 900. At this time, the height of the sound-outgoing channel 1032 is roughly equal to the height of the original cavity part 1031, thereby reducing the sound resistance and increasing the sound output volume.

[0107] In the illustrated embodiment, please continue to refer to Fig. 9The thickness of the sound outlet tube 11 is substantially the same as the total thickness of the housing 100, so as to facilitate the processing of the housing 100. The sound outlet channel 1032 includes a uniform section 10321 and a gradually expanding section 10322 connected to each other. The gradually expanding section 10322 is located between the original cavity 1031 and the uniform section 10321, and the height of the gradually expanding section 10322 gradually increases along the sound propagation direction. Among them, the size of the port of the gradually expanding section 10322 connected to the first opening 104 is the same as the size of the first opening 104. Since the speaker 900 occupies a certain thickness of the housing 100, the height of the first opening 104 is relatively small. The setting of the gradually expanding section 10322 can make full use of the height of the sound outlet tube 11, increase the cross-sectional area of ​​the sound outlet channel 1032, thereby increasing the sound propagation surface, so that the sound source transmits more sound energy to the outside world, and achieves a certain sound amplification effect.

[0108] Since the playback hole is generally disposed on the side of the electronic device, the opening direction of the sound outlet hole 102 is generally set to be perpendicular to the sound outlet direction of the speaker 900 so that the sound can be transmitted from the playback hole. Fig.10 In the illustrated embodiment, the sound outlet hole 102 is opened on the sound outlet side wall 1032 c of the sound outlet channel 1032 at the second extension end. At this time, the extension direction of the sound outlet channel 1032 is perpendicular to the opening direction of the sound outlet hole 102 .

[0109] When the sound outlet channel 1032 is formed by the sound outlet tube 11, the sound outlet tube 11 can be arranged close to the edge of the electronic device and extend along the edge of the electronic device, thereby reducing the occupation of the middle space of the electronic device. The sound outlet hole 102 can be set to gradually expand along the sound propagation direction to achieve a certain sound amplification effect.

[0110] In other embodiments, the sound outlet hole 102 may also be opened on the end wall of the sound outlet channel 1032 at the second extension end. In this case, the sound outlet hole 102 may be formed by the end of the sound outlet tube 11 to reduce the acoustic resistance of the sound at the sound outlet hole 102. In practical applications, the sound outlet hole 102 may be generally oriented toward the playback hole of the electronic device, and the specific opening direction is not limited.

[0111] Fig.11 2 is a frequency response curve diagram of the speaker system 200, wherein the dotted line is the frequency response curve of the speaker system provided by the embodiment of the present application, and the solid line is the frequency response curve of the current general speaker system. Fig.11 It can be seen that as the low-frequency performance of the speaker system 200 gradually improves, the resonant frequency of the speaker system 200 decreases, but the intensity of its mid-frequency region also gradually decreases as the resonant frequency of the speaker system 200 decreases, resulting in a decrease in the frequency response sensitivity of the mid-frequency band.

[0112] To resolve this issue, see Fig.12The front cavity 103 further includes at least one resonant cavity 107, which is connected to the sound outlet channel 1032. The resonant cavity 107 is a cavity with certain acoustic compliance and acoustic quality. When the frequency of the sound wave is the same as the natural frequency of the resonant cavity 107, the two resonate, and a resonant peak appears at the resonant frequency on the frequency response curve. Fig.13 : is a frequency response curve diagram of a speaker system with a resonant cavity, wherein the dotted line is the frequency response curve of the speaker system with a resonant cavity provided by the embodiment of the present application, and the solid line is the frequency response curve of the current general speaker system. Fig.13 It can be seen that the speaker system 200 can generate a resonance peak in the mid-frequency band of the frequency response curve by setting the resonance cavity portion 107. The existence of the resonance peak can increase the sound intensity of the frequency band between the resonance frequency of the speaker system 200 and the frequency where the peak of the resonance peak is located, thereby improving the sound intensity of the mid-frequency band of the speaker system 200. The above-mentioned mid-frequency band generally refers to the frequency band of 1k-8kHz.

[0113] The frequency f of the peak of the resonance peak h It can be obtained according to the following formula:

[0114]

[0115] Wherein, m is the sound quality of the sound output channel 1032, and c is the sound compliance.

[0116] The compliance c can be obtained according to the following formula:

[0117]

[0118] Wherein, c0 is the speed of sound, ρ is the air density, and V is the volume of the resonance cavity 107 .

[0119] When c0 and ρ are constant, the larger the volume V of the resonance cavity 107, the larger the acoustic compliance c, and the smaller the frequency of the peak of the resonance peak. In practical applications, the volume of the resonance cavity 107 can be set according to the needs of the location of the peak in the frequency response curve.

[0120] See also Fig.12 The number of the resonant cavity parts 107 can be set to be multiple, and the multiple resonant cavity parts 107 can be arranged in a staggered manner in the extension direction of the sound outlet channel 1032. The arrangement position is not limited, and the adjacent resonant cavity parts 107 can be spaced apart. The volumes of the multiple resonant cavity parts 107 should be set to be different. The resonant cavity parts 107 with different volumes can generate peaks in different frequency bands of the frequency response curve, so that the frequency response curve has the same number of resonant peaks as the number of resonant cavity parts 107. In practical applications, the number of resonant cavity parts 107 can be adjusted according to the requirements for the number of resonant peaks with different frequencies at which the peaks are located.

[0121] However, a too high peak value at the resonance peak in the frequency response curve may lead to more complicated audio tuning of the whole machine and poor sound quality. To this end, the peak value at the resonance peak can be reduced by increasing the acoustic resistance of the resonance cavity 107. However, this will also cause the overall sound intensity of the entire speaker system 200 to decrease. In practical applications, the acoustic resistance of the resonance cavity 107 can be adjusted according to actual conditions and needs. There are many ways to increase the acoustic resistance of the resonance cavity 107, such as adjusting the structure of the resonance cavity 107, or providing a damping structure on the shell 100 that can increase the acoustic resistance of the resonance cavity 107. The damping structure can be provided on the wall of the resonance cavity, or in the direction of sound propagation, such as in the sound outlet channel or at the sound outlet 102.

[0122] As one implementation, please continue to see Fig.12 , the resonant cavity portion 107 is embedded in the sound outlet channel 1032, and the cross-sectional area of ​​the resonant cavity portion 107 in the extension direction perpendicular to the sound outlet channel 1032 is larger than the cross-sectional area of ​​the sound outlet channel 1032. It can be understood that the resonant cavity portion 107 can be arranged between the sound outlet channel 1032 and the sound outlet hole 102, and the resonant cavity portion 107 can be arranged in the middle of the sound outlet channel 1032, that is, the sound outlet channel 1032 can be divided into two sub-channels by the resonant cavity portion 107 in its extension direction, and the extension length of the sound outlet channel 1032 is the sum of the extension lengths of the two sub-channels. The position of the resonant cavity portion 107 can be arranged according to the remaining space of the installation gap of the electronic device, and there is no specific limitation.

[0123] It should be noted that, in this embodiment, the resonance cavity portion 107 can also be regarded as a section where the cross-sectional area of ​​the sound outlet channel 1032 suddenly increases.

[0124] The cross-sectional area of ​​the resonance cavity portion 107 in the direction perpendicular to the extension direction of the sound outlet channel 1032 can be set to remain unchanged along the extension direction of the sound outlet channel 1032. In this case, the volume V of the resonance cavity portion 107 can be obtained according to the following formula:

[0125] v=s·l

[0126] Wherein, s is the cross-sectional area of ​​the resonance cavity portion 107 in the extending direction perpendicular to the sound outlet channel 1032 , and l is the length of the resonance cavity portion 107 in the extending direction of the sound outlet channel 1032 .

[0127] In the case where the volume of the resonance cavity 107 is constant, in order to increase the acoustic resistance of the resonance cavity 107, one way is to set the resonance cavity 107 to have a reduced cross-sectional area s and an increased length l, so as to narrow the sound output boundary of the sound, thereby increasing the acoustic resistance. Another way is to set a damping structure on the cavity wall of the resonance cavity 107, and the damping structure can increase the roughness of the cavity wall of the resonance cavity 107 to increase the friction force when the sound passes through the resonance cavity 107, thereby increasing the acoustic resistance. Yet another way is to add a damping structure in the front cavity 103 or at the sound outlet 102, and the damping structure can achieve a filtering effect to a certain extent, thereby increasing the acoustic resistance, and the damping structure can be a mesh encapsulated at the sound outlet 102.

[0128] See also Fig.12 In the illustrated embodiment, the inner wall of the resonance cavity 107 has a resonance top wall, a resonance bottom wall 107a and two resonance side walls 107b, each resonance side wall 107b is connected to the resonance top wall and the resonance bottom wall 107a, and the two resonance side walls 107b are arranged oppositely and in parallel, and the distance between the two resonance side walls 107b is the width of the resonance cavity 107, the resonance top wall and the resonance bottom wall 107a are arranged oppositely and in parallel, and the distance between the resonance top wall and the resonance bottom wall 107a is the height of the resonance cavity 107. In practical applications, the extension length of the installation gap left for the sound outlet pipe 11 is limited, and the thickness of the installation gap is also basically fixed, so the resonance bottom wall 107a is flush with the sound outlet bottom wall 1032b, the resonance top wall is flush with the sound outlet top wall 1032a, and the two resonance side walls 107b are arranged corresponding to the positions of the two side walls of the sound outlet channel 1032, respectively, and the volume of the resonance cavity 107 can be achieved by controlling the width of the resonance cavity 107. In the illustrated embodiment, at least one resonant side wall 107b of the resonant cavity portion 107 protrudes from the corresponding sound outlet side wall 1032c of the sound outlet channel 1032, that is, one resonant side wall 107b of the resonant cavity portion 107 is flush with the corresponding sound outlet side wall 1032c of the sound outlet channel 1032, and the other resonant side wall 107b protrudes from the corresponding sound outlet side wall 1032c of the sound outlet channel 1032 toward the side in the width direction of the sound outlet channel 1032, or both resonant side walls 107b of the resonant cavity portion 107 protrude from the corresponding sound outlet side wall 1032c of the sound outlet channel 1032 toward the side in the width direction of the sound outlet channel 1032.

[0129] For example, see Fig.14 and Fig.15 The shell 100 is flat, the sound cavity 101 is only provided with a front cavity 103, the speaker 900 is provided at the first opening 104 and seals the first opening 104, the second opening 105 is connected to the sound outlet side wall 1032c of the sound outlet channel 1032, and in order to strengthen the structural strength at the second opening 105, a reinforcing column 15 can be provided to support the second opening 105.

[0130] See also Fig.16 The sound outlet channel 1032 only has a uniform section 10321, and has no gradually expanding section 10322 and a gradually contracting section 10323, that is, the width of the sound outlet channel 1032 along its extending direction remains unchanged. The uniform section 10321 has two bending portions 111, and is divided into a first uniform section 10321a, a second uniform section 10321b and a third uniform section 10321c which are sequentially connected along the extension direction of the sound outlet channel 1032 by the two bending portions 111. The first uniform section 10321a and the second uniform section 10321b are connected via a bending portion 111 so that the second uniform section 10321b is bent relative to the first uniform section 10321a. The second uniform section 10321b and the third uniform section 10321c are connected via another bending portion 111 so that the third uniform section 10321c is bent relative to the second uniform section 10321b. As shown in the figure, the extension direction of the third uniform section 10321c is parallel to the extension direction of the first uniform section 10321a. There are two resonant cavity parts 107 in the sound cavity 101, one of which is embedded in the second uniform section 10321b, and the extension length of the resonant cavity part 107 can be the same as the extension length of the second uniform section 10321b, and the other resonant cavity part 107 is embedded in the third uniform section 10321c. The heights of the two resonant cavity parts 107 are the same as the height of the sound outlet channel 1032, and the widths of the two resonant cavity parts 107 are greater than the width of the sound outlet channel 1032.

[0131] As another implementation, see Fig.17 , the resonant cavity portion 107 is connected to the inner wall of the sound outlet channel 1032 through the connecting channel 108. The resonant cavity portion 107 is located on the side of the sound outlet channel 1032, and the resonant cavity portion 107 can be connected to any inner wall position of the sound outlet channel 1032 through the connecting channel 108, specifically, connected to any side wall position of the sound outlet channel 1032 through the connecting channel 108. In the illustrated embodiment, the extension direction of the connecting channel 108 is the direction from the sound outlet channel 1032 to the resonant cavity portion 107, the width direction of the connecting channel 108 is the direction perpendicular to its own extension direction, and the width direction of the resonant cavity portion 107 is the same as the width direction of the connecting channel 108. The connecting channel 108 is a channel with a width smaller than that of the resonant cavity portion 107, so that the cross-sectional area of ​​the connecting channel 108 is smaller than the cross-sectional area of ​​the resonant cavity portion 107. It should be noted that, if the installation gap space allows, the resonance cavity portion 107 may also be located in the direction of the sound outlet top wall 1032a or the direction of the sound outlet bottom wall 1032b of the sound outlet channel 1032.

[0132] There are many ways to configure the electronic device. The electronic device may not be provided with a separate housing 100 of the speaker system 200, but the sound cavity 101 may be formed by surrounding the inherent structure of the electronic device.

[0133] For some examples, see Fig.18 The electronic device includes a speaker 900 and a housing 100. The housing 100 has a front cavity 103 and a sound outlet 102. The speaker 900 is directly installed in the housing 100 and is arranged at a first opening 104 of the front cavity 103. The speaker 900 seals the first opening 104 through a diaphragm, and the speaker 900 can emit sound toward the front cavity 103. In other words, the electronic device forms the front cavity 103 through its own installation gap, so as to further increase the available space of the front cavity 103 and save installation steps.

[0134] For example, the electronic device is a tablet computer. Fig.19 and Fig. 20 The housing 100 may include a screen assembly 16, a middle frame 17, a back cover 18 and internal structural parts (not shown) connected in sequence. The internal structural parts are mounted on the middle frame 17, including but not limited to a control module and a bracket. The control module includes but is not limited to a mainboard, devices and structural parts arranged on the mainboard, etc. The screen assembly 16, the middle frame 17, the back cover 18 and the internal structural parts are collectively surrounded to form a front cavity 103.

[0135] Specifically, the screen assembly 16, the middle frame 17, the back cover 18 and the internal structural parts are together formed to form an installation gap, and the installation gap is connected to the sound outlet 102. At this time, the sound outlet 102 of the shell 100 is the playback hole of the electronic device. The speaker 900 can be installed in the installation gap. The speaker 900 seals a section of the installation gap through the diaphragm 901. The first opening 104 of the front cavity 103 is formed at the section. At this time, the front cavity 103 is formed from the diaphragm 901 to the sound outlet 102. The installation gap forms an original cavity 1031 between the speaker 900 and the back cover 18, and forms a sound outlet channel 1032 between the screen assembly 16 and the back shell 18, wherein a reinforcing column 15 for enhancing the structural strength of the front cavity 103 is provided at the second opening 105. It should be noted that the installation gap can be formed by the inherent structural parts or devices in the internal structural parts to form the inner wall, but the inherent structural parts or devices in the internal structural parts may be arranged at intervals, and it is impossible to ensure that the inner wall of the front cavity 103 is closed. In this regard, the internal structural parts may also include a baffle 19, which is used to form all or part of the inner wall of the front cavity 103. For example, the baffle 19 can be sealed and connected to the gap between the inherent structural parts and devices in the internal structural parts to close the inner wall of the installation gap forming the front cavity 103, and can also directly form the sound outlet side wall of the sound outlet channel 1032 and the original cavity side wall of the original cavity part 1031. The setting of the baffle 19 can make the extension path of the front cavity 103 smoother and reduce the acoustic resistance.

[0136] Finally, it should be noted that the above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An electronic device, characterized in that: Including a speaker, the electronic device has a sound cavity and a sound outlet; Wherein, the sound cavity at least includes a front cavity, the front cavity has a first opening for installing the speaker, the front cavity at least includes an original cavity part and a sound outlet channel, the original cavity part is opposite to the first opening and is located in the sound outlet direction of the speaker, a second opening is opened on the side wall of the original cavity part, the sound outlet channel is connected with the second opening and extends toward the side of the original cavity part, the sound outlet hole is connected to the extension end of the sound outlet channel away from the second opening, and the sound outlet channel is staggered with the speaker in the sound outlet direction of the speaker; The speaker is arranged at the first opening and the first opening is sealed by a diaphragm, and the speaker can emit sound toward the original cavity; The electronic device comprises a screen assembly, a middle frame, a back cover and an internal structure connected in sequence, wherein the screen assembly, the middle frame, the back cover and the internal structure are collectively arranged to form the front cavity, wherein the screen assembly, the middle frame, the back cover and the internal structure are collectively arranged to form an installation gap, the installation gap is connected to the sound outlet hole, and the installation gap includes the original cavity portion and the sound outlet channel; The sound outlet channel has a first extension end and a second extension end, the sound outlet channel extends from the first extension end toward the second extension end, the extension path of the sound outlet channel from the first extension end to the second extension end is in a strip shape, the first extension end of the sound outlet channel is connected to the second opening, the second extension end is the extension end of the sound outlet channel away from the second opening, the second extension end is located on the side of the original cavity part, the sound outlet hole is connected to the second extension end, and after the speaker is installed at the first opening, the original cavity bottom wall of the original cavity part faces the diaphragm of the speaker; The extension path of the sound output channel is set by utilizing the installation gap between the components and structural parts inside the electronic device, and the sound output channel is coiled or bent and extended in the installation gap; The sound output channel comprises a tapered section, a uniform section and a gradually expanding section which are connected in sequence, wherein the cross-sectional area of ​​the uniform section remains unchanged along the extension direction of the sound output channel; the cross-sectional area of ​​the gradually expanding section gradually increases along the extension direction of the sound output channel; and the cross-sectional area of ​​the tapered section gradually decreases along the extension direction of the sound output channel; The sound output channel has a plurality of bending portions, the bending portions extend along a bending path, and the portion of the sound output channel other than the bending portions extends along a straight line; When an angle is formed on the wall surface of the inner wall of the sound outlet channel, the angle of the inner wall of the sound outlet channel is smoothly transitioned.

2. The electronic device according to claim 1, characterized in that: The sound cavity further includes a rear cavity communicated with the first opening, and the front cavity and the rear cavity are separated by a diaphragm of the speaker.

3. The electronic device according to claim 1, characterized in that: The plane where the extension path of the sound output channel lies is perpendicular to the sound output direction of the speaker.

4. The electronic device according to claim 3, characterized in that: The opening direction of the sound outlet is perpendicular to the sound outlet direction of the speaker.

5. The electronic device according to claim 3, characterized in that: The sound outlet channel extends along a straight path.

6. The electronic device according to any one of claims 1 to 5, characterized in that: The sound cavity further includes at least one resonance cavity portion, and the resonance cavity portion is connected to the sound output channel.

7. The electronic device according to claim 6, characterized in that: The resonance cavity portion is embedded in the sound output channel.

8. The electronic device according to claim 6, characterized in that: The resonance cavity portion is connected to the inner wall of the sound output channel through a connecting channel, and the cross-sectional area of ​​the connecting channel is smaller than the cross-sectional area of ​​the resonance cavity portion.

9. The electronic device according to claim 6, characterized in that: There are a plurality of resonant cavity portions, and the plurality of resonant cavity portions are staggered in the extension direction of the sound outlet channel.

10. The electronic device according to claim 1, characterized in that: The electronic device is provided with a damping structure for increasing acoustic resistance.

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