GB2608077A

GB2608077A - Mobile terminal

Info

Publication number: GB2608077A
Application number: GB2213692.3A
Authority: GB
Inventors: Zhang Fukun; Lei Weiqiang; Hua Zhanyi
Original assignee: Hytera Communications Corp Ltd
Current assignee: Hytera Communications Corp Ltd
Priority date: 2020-02-24
Filing date: 2020-02-24
Publication date: 2022-12-21
Anticipated expiration: 2040-02-24
Also published as: GB2608077B; DE112020006436T5; GB202213692D0; WO2021168631A1; CN115552922A

Abstract

The present application relates to a mobile terminal, comprising: a housing provided with an accommodating cavity and sound outlets; and a loudspeaker assembly that is provided in the accommodating cavity and outputs sound by means of the sound outlets. The loudspeaker assembly comprises a loudspeaker and a dustproof net; the dustproof net is fixed on the housing and is located between the loudspeaker and the housing; the loudspeaker comprises a vibration diaphragm used for vibrating to generate sound; the proportion of the area of the sound outlets to the effective area of the vibration diaphragm is not greater than 15%; the net-shaped area of the dustproof net is greater than the area of the sound outlets; the dustproof net, the housing, and the loudspeaker all are arranged at intervals. The mobile terminal of the present application increases the net-shaped area of the dustproof net, so that sound is propagated to the sound outlets by means of a gap between the dustproof net and the housing, thereby increasing the air-permeable area of the dustproof net and reducing a thermal viscous effect, and thus reducing the attenuation effect of the dustproof net on sound, increasing a signal-to-noise ratio, and avoiding the condition that abnormal sound is generated because the dustproof net vibrates and collides with the housing and the loudspeaker.

Description

MOBILE TERMINAL

TECHNICAL FIELD

[0001] The present disclosure relates to the field of communication technologies, and in particular to a mobile terminal

BACKGROUND

[0002] With the development of technology, people are demanding more and more for mobile terminals, such as the need for better sound. The current mobile terminal is becoming thinner and lighter, and spaces it leaves for a speaker assembly is very limited, which is not conducive to the radiation of sound.

[0003] The speaker assembly conventionally includes a dust screen for dustproofing, protecting a speaker diaphragm, and sound quality adjustment, but the product design (ID) will be limited by space when designing a sound outlet area in the panel due to the cooperation between a keyboard and other components. In cases of the sound outlet area itself in a limited design, in the related art, the dust screen is usually arranged to fit a shell, that is, no gap exists between the dust screen and the shell. In addition, a mesh of the dust screen almost perfectly covers the sound outlet, that is, the area of the mesh is substantially equal to the area of the sound outlet. hi this case, the sound and air can only pass through a small area of the mesh, which leads to large sound loss and sound resistance increasing, such that sound radiation capacity is reduced and the acoustic performance is sacrificed; moreover, the air speed through the mesh increases, and a thermal stagnation effect of the air and the dust screen increases, such that the loudness is weakened and wind noise increases.

[0004] Therefore, in order to solve the above problems, a mobile terminal with a new design is hereby proposed.

SUMMARY OF THE DISCLOSURE

[0005] To achieve the above purpose, the present disclosure provides a mobile terminal comprising: a housing, defining a housing cavity and at least one sound outlet; and a speaker assembly, received in the housing cavity and capable of generating sound emitted from the at least one sound outlet; wherein the speaker assembly comprises a speaker and a dust screen, the dust screen being fixed to the housing and disposed between the speaker and the housing; the speaker comprises a vibrating diaphragm for vibration sounding; a ratio of an area of the at least one sound outlet to an effective area of the vibrating diaphragm is less than or equal to 15%; a mesh area of the dust screen is greater than the area of the at least one sound outlet, and the dust screen is spaced from both the housing and the speaker.

[0006] In some embodiments, the housing comprises: a front shell, defining the at least one sound outlet and arranged with a connecting portion protruding toward the dust screen on a side of the front shell near the dust screen; and a rear shell; wherein the dust screen is fixed to the front shell and comprises: a plurality of mesh portions; and a bonding portion, formed on a side of the dust screen near the front shell; wherein the bonding portion comprises a first bonding strip and a second bonding strip, the first bonding strip being arranged around a circumferential edge of the dust screen, and the second bonding strip being arranged to separate the dust screen to form the plurality of mesh portions, such that a harmonic frequency of the plurality of mesh portions is away from harmonic frequencies of the speaker and the housing cavity; wherein the connecting portion faces the bonding portion to bond the bonding portion.

[0007] In some embodiments, the second bonding strip is arranged in a cross shape, and an end of the second bonding strip is connected to the first bonding strip; the number of the plurality of mesh portions is four; the connecting portion faces the bonding portion to separate the front shell in the housing cavity into four sound outlet portions; the number of the at least one sound outlet is more than one, and the at least one sound outlet are evenly distributed in the four sound outlet portions.

[0008] In some embodiments, an area of each mesh portion is greater than an area of at least one of the at least one sound outlet, the at least one of the at least one sound outlet being arranged in one of the four sound outlet portions corresponding to the each mesh portion.

[0009] In some embodiments, the number of the at least one sound outlet is four, and each sound outlet portion is arranged with a corresponding one of the at least one sound outlet.

[0010] In some embodiments, the plurality of mesh portions arc integrally formed with the bonding portion, and the bonding portion and the connecting portion are fixed to each other by means of adhesive backing.

[0011] In some embodiments, the housing further comprises: a side wall, extending from a side of the front shell near the dust screen to the dust screen; and a first flange, arranged around an inside of the side wall and formed by protruding from a side of the front shell toward the dust screen toward the dust screen: the speaker comprises: a second flange, formed by protruding from a side of a circumferential edge of the speaker near the front shell toward the front shell, the second flange being fixedly connected to the first flange.

[0012] In some embodiments, a protruding height of the first flange is greater than a protruding height of the connecting portion.

[0013] In some embodiments the first flange and the second flange are fixed to each other by means of adhesive backing.

[0014] Compared with the related art, the beneficial effect of the present disclosure includes as follows.

[0015] The mobile terminal provided by the present disclosure uses a dust screen with a mesh area greater than the area of the sound outlet, and the dust screen is arranged at intervals with the housing, such that sound propagates to the sound outlet through the interval space between the dust screen and the housing, thereby increasing the air permeable area of the dust screen and reducing the thermal stagnation effect, thus reducing the attenuation effect of the dust screen on sound and increasing the signal-to-noise ratio. Moreover, in the mobile terminal of the present disclosure, the dust screen is fixed to the housing, and the dust screen is spaced from both the 1 and the speaker, thereby preventing a heterodyne sound generation caused by the dust screen vibrating and colliding with the housing and the speaker.

BRIEF DESCRIPTION OF THE DRAWINGS

100161 FIG. 1 is a structural schematic view of a mobile terminal according to an embodiment of the

present disclosure.

[0017] FIG. 2 is an exploded schematic view of a partial structure of a speaker assembly and a front housing of a mobile terminal according to an embodiment of the present disclosure.

[0018] FIG. 3 is a structural schematic view of a dust screen of a mobile teiminal according to an

embodiment of the present disclosure.

[0019] FIG. 4 is a comparison diagram between a frequency response curve of a mobile terminal of the present disclosure and a frequency response curve of a mobile terminal in the related art.

DETAILED DESCRIPTION

[0020] The present disclosure will be described in detail hereinafter in connection with the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present disclosure. Structural, methodological, or functional modifications made by those skilled in the art in accordance with these embodiments are included in the scope of the present disclosure.

100211 Referring to FIGS. 1-FIG. 3, the present disclosure provides a mobile terminal 100 including a housing 1 and a speaker assembly 2. The housing I defines a housing cavity 11 and a sound outlet 12. The speaker assembly 2 is received in the housing cavity 11 and sound is emitted from the sound outlet 12. It is to be noted that the mobile terminal 100 may be a walkie-talkie, a speaker, a mobile phone, an audible smart wearable watch, a navigator, and other devices that can make sound. For example, the mobile terminal 100 of the present disclosure may be a walkie-talkie of the PNC 380 model.

100221 The speaker assembly 2 includes a speaker 21 and a dust screen 22, the dust screen 22 being fixed to the housing 1 and disposed between the speaker 21 and the housing 1. The dust screen 22 has the functions of dustproofing, protecting a speaker diaphragm, and sound quality adjustment. Specifically, by the arrangement of the dust screen 22, the effect of speaker assembly 2 or the function of other components in the mobile terminal 100, caused by dust or water vapor entering the mobile terminal 100 through the sound outlet 12, may be not affected.

[0023] Further, the speaker 21 includes a vibrating diaphragm (not shown) for vibration sounding. Due to the cooperation between a keyboard and other components, the product design (ID) will be limited by space when designing the area of the sound outlet 12 in a panel, and a ratio of the area of the sound outlet 12 to an effective area of the vibrating diaphragm is less than or equal to 15%. A simple algorithm of the effective area of the vibrating diaphragm is the area of a plane corresponding to an outer diameter of the vibrating diaphragm.

100241 Further, in the present disclosure, a mesh area of the dust screen 22 is greater than the area of the sound outlet 12, and the dust screen 22 is spaced from both the housing 1 and the speaker 21.

[0025] During operation of the speaker assembly 2, sound propagates to the sound outlet 12 through the interval space between the dust screen 22 and the housing 1. Compared with the related art in which the dust screen 22 is arranged close to the housing 1 and the mesh area of the dust screen 22 is just equal to the area of the sound outlet 12, the present disclosure increases the mesh area of the dust screen 22 and changes the traditional sound conduction path. That is, the sound is transmitted, not as the related art to the sound outlet 12 only through a minimum mesh area of the dust screen 22, but as the present disclosure to the sound outlet 12 through a larger mesh area of the dust screen 22 and then through an interval space between the dust screen 22 and the housing 1, thereby increasing the area of the sound and air passing through the dust screen 22, reducing the thermal stagnation effect, and therefore reducing the attenuation effect of the dust screen 22 on the sound and increasing the signal-to-noise ratio. Moreover, in the mobile terminal 100 of the present disclosure, the dust screen 22 is fixed to the housing 1, and the dust screen 22 is spaced from both the housing 1 and the speaker 21. thereby preventing a heterodyne sound generation caused by the dust scrccn 22 vibrating and colliding with the housing 1 and the speaker 21.

[0026] Specifically, the principle of sound attenuation in the related art is that, according to Newton's viscosity law formula, the shear stress of a fluid is proportional to the angular velocity of shear deformation. The velocity of the particles near the boundary during the propagation of sound is slow and tends to zero at the boundary. However, within the housing cavity 11, the particles move at standard acoustic velocities according to Euler's equation. Under the action of viscosity, the air is stuck to the boundary, and the boundary velocity is therefore zero and the neighboring particles slow down, resulting in an overall energy loss; or to say, the sound energy is conversed into heat due to viscous dissipation from shear. Within the housing cavity 11, the molecules are free to move; however, the number of the molecules is limited because of the small mesh area of the dust screen 22. In short, the smaller the mesh area of the dust screen 22, the greater the speed of air passing through the dust screen 22, the greater the shear force of the air on the edge, and thus the greater the kinematic viscosity of air at the edge of the dust screen 22 and the greater the sound loss, and further the lower the sound loudness, i.e., the lower the sound transfer energy.

[0027] Conversely, in the present disclosure, due to the increased mesh area of the dust screen 22, the speed of the air passing through the dust screen 22 decreases, and the shear force of the air on the edge decreases, such that the kinematic viscosity of the air at the edge of the dust screen 22 decreases, and the sound loss decreases, and thus the sound loudness increases, i.e., the sound transfer energy increases.

[0028] Specifically, the housing 1 includes a front shell 13, a rear shell (not shown), and a side wall 14 extending from a side of the front shell 13 near the dust screen 22 to the dust screen 22. The front shell 13 defines the sound outlet 12, the dust screen 22 is fixed to the front shell 13 and includes multiple mesh portions 221 and a bonding portion 222 formed on a side of the dust screen 22 near the front shell 13.

[0029] The bonding portion 222 includes a first bonding strip 2221 and a second bonding strip 2222, the first bonding strip 2221 being arranged around a circumferential edge of the dust screen 22, and the second bonding strip 2222 being arranged to separate the dust screen 22 to form the mesh portions 221. Since the speaker 21 has a resonant frequency point with the housing cavity 11, the second bonding strip 2222 is arranged such that the mesh portions 221 avoid the resonant frequency point of the speaker 21 with the housing cavity 11. Specifically, in the process of increasing the area of the mesh portions 221 of the dust screen 22, the resonant frequency of the mesh portions 221 will tend to decline. Through the above fixing means of blocking the dust screen 22, the structure shape of each mesh portion 221 is controlled, thereby avoiding the resonant frequency point and the sound frequency band of the speaker 21 and the housing cavity 11, controlling the modal vibration pattern and amplitude of the dust screen 22, so as to prevent the generation of heterodyne and effectively ensure the signal-to-noise ratio.

[0030] Specifically, the second bonding strip 2222 may be arranged in a cross shape, and an end of the second bonding strip 2222 is connected to the first bonding strip 2221; the second bonding strip 2222 separates the dust screen 22 into four mesh portions 221. Of course, in other embodiments of the present disclosure, the shape of the second bonding strip 2222 and the separation of the dust screen 22 may be adjusted according to actual requirements. in specific embodiments of the present disclosure, in order to avoid the resonant frequency point of the speaker 21 and the housing cavity 11, the bonding portion 222 separates the dust screen 22 into four mesh portions 221 of different areas, i.e., an intersection of the first bonding strip 2221 and the second bonding strip 2222 is not located at a center point of the entire dust screen 22. Of course, in other embodiments, the specific location of the bonding portion 222 and the division of the mesh portions 221 may be set according to the specific resonant frequency points of different speaker assemblies 2. Correspondingly, the front shell 13 is formed with a connecting portion 131 protruding toward the dust screen 22 on a side of the front shell 13 near the dust screen 22, the connecting portion 131 facing the bonding portion 222 to bond the bonding portion 222. Specifically', the connecting portion 131 includes a first connecting strip 1311 and a second connecting strip 1312. The first bonding strip 2221 is bonded to the first connecting strip 1311, and the second bonding strip 2222 is bonded to the second connecting strip 1312. In the embodiments, the mesh portions 221 are integrally formed with the bonding portion 222, and the bonding portion 222 and the connecting portion 131 are fixed to each other by means of adhesive backing. Specifically, the connecting portion 131 faces the bonding portion 222 to separate the front shell 13 in the housing cavity 11 into four sound outlet portions 132, and a plurality of the sound outlets 12 are evenly distributed in the sound outlet portions 132. In the above manner, the dust screen 22 is firmly fixed to the front shell 13, and the tension of the dust screen 22 is ensured to prevent the heterodyne sound generation due to insufficient tension, which is conducive to the thinness and lightness of the mobile terminal. In addition, a protruding extension thickness of the connecting portion 131 ensures the spacing distance between the dust screen 22 and the front shell 13 and reduces the sound loss. Of course, in other embodiments of the present disclosure, the bonding portion 222 and the connecting portion 131 may be fixed by other means, as long as the effect of connecting and fixing the bonding portion 222 to the connecting portion 131 is achieved.

[0031] Specifically, in the embodiments, four sound outlets 12 are defines, and each sound outlet 12 is defined in a corresponding sound outlet portion 132. Of course, in other embodiments, the number of the sound outlets 12 may be increased or decreased according to actual situations.

[0032] In the present disclosure, the area of each mesh portion 221 is greater than the area of the sound outlet 12 in a corresponding sound outlet portion 132. In this way, when the sound comes out of either sound outlet 12, the sound is propagated from the mesh portion 221 of the dust screen 22 to the corresponding sound outlet 12 through the spacing space between the dust screen 22 and the front shell 13, thereby enhancing the radiation of the sound propagated from either sound outlet 12.

100331 Further, the housing 1 includes a first flange 15 arranged around an inside of the side wall 14, the first flange 15 being formed by protruding from a side of the front shell 13 toward the dust screen 22 toward the dust screen 22. The speaker 21 includes a second flange 211 formed by protruding from a side of a circumferential edge of the speaker 21 near die front shell 13 toward the front shell 13, the second flange 211 being fixedly connected to the first flange 15. In this way, the present disclosure achieves a firm fixation of the speaker 21 to the front shell 13. Specifically, in the embodiments, the first flange 15 and the second flange 211 are also fixed to each other by means of adhesive backing. Of course, in other embodiments, the first flange 15 and the second flange 211 may be fixed in other ways, as long as the effect of fixing the speaker 21 to the front shell 13 is achieved.

100341 Further, in order to ensure the spacing distance between the speaker 21 and the dust screen 22, a protruding height of the first flange 15 is greater than a protruding height of the connecting portion 131. In this way, when the speaker assembly 2 of the present disclosure operates, die dust screen 22 does not collide with both the speaker 21 and the front shell 13.

100351 It should be noted that the protruding height of the connecting portion 131 is designed according to a maximum amplitude of the dust screen 22 without touching the front housing 13, and the protruding height of the first flange 15 is designed according to the maximum amplitude of the dust screen 22 without touching the speaker 21.

100361 Referring to FIG. 4, FIG. 4 is a comparison diagram between a frequency response curve of a mobile terminal in the present disclosure and a frequency response curve of a mobile terminal in the related art. In FIG. 4, die solid line located above corresponds to the mobile terminal 100 of the present disclosure and the solid line located below corresponds to the mobile terminal in the related art. As can be seen from FIG. 4, the sound magnitude of the mobile terminal 100 of the present disclosure is significantly improved at both low and medium frequencies and high frequencies, where the increase is nearly 4dB at [kHz and 3.5kHz. At 3.5kHz, the phase is shifted back and a frequency modulation extension is slightly improved. Therefore, the mobile terminal 100 in the present disclosure may use less power consumption to achieve the same loudness of sound, ensuring the sound quality while reducing energy consumption.

100371 In summary, the mobile terminal 100 provided by the present disclosure uses a dust screen 22 with a mesh area greater than the area of the sound outlet 12, and the dust screen 22 is arranged at intervals with the housing 1, such that sound propagates to the sound outlet 12 through the interval space between the dust screen 22 and the housing 1, thereby increasing the air permeable area of the dust screen 22 and reducing the thermal stagnation effect, thus reducing the attenuation effect of the dust screen 22 on sound and increasing the signal-to-noise ratio. Moreover, in the mobile terminal 100 of the present disclosure, the dust screen 22 is fixed to the housing 1, and the dust screen 22 is spaced from both the housing 1 and the speaker 21, thereby preventing a heterodyne sound generation caused by the dust screen 22 vibrating and colliding with the housing 1 and the speaker 21.

[0038] It should be understood that although this specification is described in accordance with the embodiments, but not each embodiment contains only a separate technical solution, and the specification of this narrative only for clarity. Those skilled in the art should take the specification as a whole, the technical solution in each embodiment may also be properly combined to form other embodiments that can be understood by those skilled in the art.

[0039] The series of detailed descriptions listed above are only specific to the feasible embodiments of the present disclosure and are not intended to limit the scope of the present disclosure, and any equivalent embodiments or changes made without departing from the spirit of the present disclosure shall be included in the scope of the present disclosure.

Claims

What is claimed is: I. A mobile terminal, characterized by comprising: a housing, defining a housing cavity and at least one sound outlet; and a speaker assembly, received in the housing cavity and capable of generating sound emitted from the at least one sound outlet; wherein the speaker assembly comprises a speaker and a dust screen, the dust screen being fixed to the housing and disposed between the speaker and the housing, the speaker comprising a vibrating diaphragm for sound production by vibration; wherein a ratio of an area of the at least one sound outlet to an effective area of the vibrating diaphragm is less than or equal to 15%; a mesh area of the dust screen is greater than the area of the at least one sound outlet, and the dust screen is spaced from both the housing and the speaker.
2. The mobile terminal according to claim 1, wherein the housing comprises: a front shell, defining die at least one sound outlet and arranged with a connecting portion protruding toward the dust screen on a side of the front shell near the dust screen; and a rear shell; wherein the dust screen is fixed to the front shell and comprises: a plurality of mesh portions; and a bonding portion, formed on a side of the dust screen near the front shell; wherein the bonding portion comprises a first bonding strip and a second bonding strip, the first bonding strip being arranged around a circumferential edge of the dust screen, and the second bonding strip being arranged to separate the dust screen to form die plurality of mesh portions, such that a harmonic frequency of the plurality of mesh portions is away from harmonic frequencies of die speaker mid the housing cavity; wherein the connecting portion faces the bonding portion to bond the bonding portion.
3. The mobile terminal according to claim 2, wherein the second bonding strip is arranged in a cross shape, and an end of the second bonding strip is connected to the first bonding strip; the number of the plurality of mesh portions is four; the connecting portion faces the bonding portion to separate the front shell in the housing cavity into four sound outlet portions; the number of the at least one sound outlet is more than one, and the at least one sound outlet are evenly distributed in the four sound outlet portions.
4. The mobile terminal according to claim 3, wherein an area of each mesh portion is greater than an area of at least one of the at least one sound outlet, the at least one of the at least one sound outlet being arranged in one of the four sound outlet portions corresponding to the each mesh portion.
5. The mobile terminal according to claim 3, wherein the number of the at least one sound outlet is four, and each sound outlet portion is arranged with a corresponding one of the at least one sound outlet.
6. The mobile temiinal according to claim 2, wherein the plurality of mesh portions are integrally formed with the bonding portion, and the bonding portion and the connecting portion are fixed to each other by means of adhesive backing.
7. The mobile terminal according to claim 2, wherein the housing further comprises: a side wall, extending from a side of the front shell near the dust screen to the dust screen; and a first flange, arranged around an inside of the side wall and formed by protmding from a side of the front shell toward the dust screen toward the dust screen; and wherein the speaker comprises: a second flange, formed by protruding from a side of a circumferential edge of the speaker near the front shell toward the front shell, the second flange being fixedly connected to the first flange.
8. The mobile terminal according to claim 7, wherein a protruding height of the first flange is greater than a protruding height of the connecting portion
9. The mobile terminal according to claim 7, wherein the first flange and the second flange are fixed to each other by means of adhesive backing.