Speaker Module

Abstract

The present invention provides a speaker module for a portable terminal equipped with a sound outlet. [Solution] The speaker module comprises a speaker box, which has an audio output opening for side sound generation, and the speaker module further comprises a horn connected to the audio output opening, the horn is hollow and open at both ends, one end of the horn is connected to the side of the speaker box and communicates with the audio output opening, and the other end of the horn is used to connect to the sound output port of the mobile terminal, the cross-sectional area of ​​the horn along the sound output direction gradually changes, and the horn is designed and lofted with a variable cross-section having different areas or lengths and widths, so that the dimensions of the variable cross-section are directly related to the sound quality of each part of the horn, and the horn can achieve a small-sized multi-stage resonance and expand the range of the frequency band by optimizing the coupling of local impedance of the horn based on transmission line network theory.

Description

[Technical Field]

[0001] The present invention relates to the technical field of electroacoustic conversion, and in particular to speaker modules. [Background technology]

[0002] With the development of electroacoustic conversion technology, it has been applied to terminal electronic devices such as computers, mobile phones, MP4s, PDAs, etc. With the continuous progress and development of the electronics industry and science and technology, audiences inevitably have higher requirements for the acoustic performance of speakers, and speaker modules are widely used in various terminal devices.

[0003] In the speaker horn of the related art, the top surface and bottom surface in the thickness direction of the terminal device are both flat, the top surface is parallel to the upper case surface of the terminal device, the bottom surface is parallel to the lower case surface of the terminal device, and the horn is perpendicular to the thickness direction of the terminal device and the length direction of the horn, extending from the horn mouth to the horn throat. As a result, under the constraint that the thickness of the terminal device is thin, by combining the micro speaker and the horn, the goal of low resonance frequency F0 and high loudness is achieved.

[0004] However, the horn of the related art has a large volume, a high demand for shape expansion, and an inability to flexibly form a retreat space, resulting in a low resonance effect.

[0005] Therefore, it is necessary to provide a new speaker module to solve the above problems. Summary of the Invention [Problem to be solved by the invention]

[0006] The technical problem to be solved by the present invention is to provide a speaker module that is small in volume, has a flexible escape space, has a high effect of multi-stage resonance, and can effectively expand the range of the frequency band. [Means for solving the problem]

[0007] In order to solve the above technical problems, the present invention provides a speaker module for a mobile terminal equipped with a sound output port, the speaker module comprising a speaker box, the speaker box comprising an audio output opening for side sound emission, the speaker module further comprising a horn connected to the audio output opening, the horn being hollow and open at both ends, one end of the horn being connected to the side of the speaker box and communicating with the audio output opening, the other end of the horn being used to connect to the sound output port of the mobile terminal, and the horn having a cross-sectional area that gradually changes along the sound output direction.

[0008] Preferably, the horn has a top surface and a bottom surface spaced apart along the thickness direction of the speaker box, and two side surfaces connected to the bottom surface and the top surface, respectively, and the bottom surface and / or the top surface are curved.

[0009] Preferably, the horn comprises a first segment connected to the sound output opening, a second segment bent and extending from one end of the first segment away from the speaker box and spaced apart from the speaker box, and a third segment formed by extending from one end of the second segment away from the first segment, the third segment being used to connect to a sound output port of the mobile terminal, the bottom surfaces corresponding to the first segment and the second segment are both flat, the top surface corresponding to the first segment is a first arc-shaped surface, the top surface corresponding to the second segment is a second arc-shaped surface, the bottom surface and the top surface corresponding to the third segment are a third arc-shaped surface and a fourth arc-shaped surface, respectively, and the first arc-shaped surface, the second arc-shaped surface, the third arc-shaped surface and the fourth arc-shaped surface have different degrees of curvature.

[0010] Preferably, the bending radius of the connection portion between the first segment and the second segment is greater than four times the minimum wavelength.

[0011] Preferably, the inner diameter of the connection portion between the first segment and the second segment is smaller than half the wavelength.

[0012] Preferably, the speaker box has a rectangular shape, and the sound output opening is located on a short side of the speaker box.

[0013] Preferably, there are a plurality of the horns, and the first segments of the plurality of the horns are arranged side by side along the width direction of the speaker box, the second segments of the plurality of the horns are arranged alternately stacked along the thickness direction of the speaker box, and the third segments of the plurality of the horns are arranged side by side along the length direction of the speaker box.

[0014] Preferably, the second segment and / or the third segment is filled with a sound absorbing material. [Effects of the Invention]

[0015] Compared with the related art, the speaker module of the present invention is used in a mobile terminal equipped with a sound outlet, the speaker module comprises a speaker box, the speaker box has an audio output opening for side sound emission, and the speaker module further comprises a horn connected to the audio output opening, the horn is hollow and open at both ends, one end of the horn is connected to the side of the speaker box and communicates with the audio output opening, and the other end of the horn is used to connect to the sound outlet of the mobile terminal, the cross-sectional area of the horn along the sound output direction gradually changes, and the horn is designed with a variable cross-section having different areas or lengths and widths and is lofted, so that the dimensions of the variable cross-section are directly related to the sound quality of each part of the horn, and the impedance of each part of the horn is fully coupled, thereby realizing multi-stage resonance in a small volume and widening the frequency band range, and at the same time, its small volume and flexible escape space make it easy to fit into the housings of different mobile terminals. [Brief explanation of the drawings]

[0016] In order to more clearly explain the technical solutions in the embodiments of the present invention, the following will briefly describe the drawings that need to be used in describing the embodiments. However, the drawings described below are only some embodiments of the present invention, and those skilled in the art in the technical field to which the present invention belongs can obtain other drawings based on these drawings without any creative work. [Figure 1] 1 is a schematic diagram showing an axisymmetric structure of a speaker module of the present invention. [Figure 2] 1 is an axisymmetric left side view of a speaker module of the present invention; FIG. [Figure 3] FIG. 2 is an exploded perspective view of FIG. [Figure 4] FIG. 2 is a schematic diagram showing the structure of the first segment of FIG. 1. [Figure 5] FIG. 2 is a schematic diagram showing the structure of the second segment of FIG. 1. [Figure 6] FIG. 2 is a schematic diagram showing the structure of the third segment of FIG. 1. [Figure 7] 1 is a schematic diagram showing the structure of an overlapping multi-horn of a speaker module of the present invention. FIG. [Figure 8] 1 is a schematic diagram showing the volume axisymmetric structure of the sound-absorbing material plus horn of the speaker module of the present invention. FIG. [Figure 9] FIG. 9 is a cross-sectional view symmetrical with respect to the line AA in FIG. 8. [Figure 10] 1 is an SPL graph of the transmitted frequency response of the speaker module of the present invention. [Figure 11] 4 is a graph showing a change in sound pressure impedance of the speaker module of the present invention. [Figure 12] 1 is a matching SPL graph of the speaker module of the present invention. [Figure 13] 1 is a graph of sound pressure level SPL when the speaker module of the present invention is filled with a damping material. [Figure 14] 1 is a graph of SPL showing the results of an acoustic performance test of the speaker module of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] The following clearly and completely describes the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention, and it is clear that the described embodiments are only a part of the embodiments of the present invention, and do not represent all the embodiments. Based on the embodiments of the present invention, all other embodiments that can be obtained by those skilled in the art in the technical field to which the present invention belongs without any creative work shall fall within the protection scope of the present invention.

[0018] 1 to 9, a speaker module 100 is provided for use in a mobile terminal (not shown) equipped with a sound output port (not shown). The speaker module 100 includes a speaker box 1 having a sound output opening 11 for side sound emission. The speaker module 100 further includes a horn 2 connected to the sound output opening 11. The horn 2 is hollow and open at both ends. One end of the horn 2 is connected to the side of the speaker box 1 and communicates with the sound output opening 11, and the other end of the horn 2 is used to connect to the sound output port of the mobile terminal. The cross-sectional area of the horn 2 gradually changes along the sound output direction of the horn 2. By designing the horn to have a variable cross-section with different areas or lengths and widths and performing lofting, the dimensions of the variable cross-section are directly related to the sound quality of each part of the horn 2, and the impedances of each part of the horn 2 are fully coupled, thereby realizing multi-stage resonance in a small volume and widening the frequency band range. At the same time, its small volume and flexible retraction space make it easy to fit into the housings of different mobile terminals.

[0019] Preferably, the mobile terminal may be a mobile phone, a computer, a tablet, etc. The speaker module 100 is adapted into the mobile terminal, and the speaker box 1 and the mobile terminal are assembled and installed via the horn 2, thereby improving the acoustic performance of the mobile terminal.

[0020] In this embodiment, the horn 2 has a top surface and a bottom surface that are spaced apart along the thickness direction of the speaker box 1, and two side surfaces that are connected to the bottom surface and the top surface, respectively, and the bottom surface and / or the top surface are curved.

[0021] The speaker in speaker box 1 has a diaphragm that vibrates on the side of speaker box 1, and the direction of vibration of the diaphragm is the thickness direction of speaker box 1. By designing horn 2 to include a top surface and a bottom surface spaced apart in the thickness direction and two side surfaces connected to the bottom surface and top surface, respectively, the cross section of horn 2 in the sound output direction has a gradual change effect, multi-stage resonance is realized, and the range of the frequency band is expanded.

[0022] In this embodiment, the horn 2 includes a first segment 21 connected to the sound output opening 11, a second segment 22 bent and extending from one end of the first segment 21 remote from the speaker box 1 and spaced apart from the speaker box, and a third segment 23 formed by extending from one end of the second segment 22 remote from the first segment, the third segment 23 being used to connect to a sound output port of the mobile terminal. The bottom surfaces corresponding to the first segment 21 and the second segment 22 are both flat surfaces 4, the top surface corresponding to the first segment 21 is a first arc-shaped surface 5, the top surface corresponding to the second segment 22 is a second arc-shaped surface 6, and the bottom surface and the top surface corresponding to the third segment 23 are a third arc-shaped surface 7 and a fourth arc-shaped surface 10, respectively, the first arc-shaped surface 5, the second arc-shaped surface 6, the third arc-shaped surface 7, and the fourth arc-shaped surface 10 having different degrees of curvature.

[0023] Specifically, the sound output opening 11 installed on the sound output side of the speaker box 1 is connected to the horn 2 and is used to transmit the sound emitted from the speaker box 1, thereby improving the acoustic performance of the speaker box 1. The horn 2 includes a first segment 21, a second segment 22, and a third segment 23. By designing the horn 2 with a variable cross section having different areas or lengths and widths and performing lofting, the dimensions of the variable cross section are directly related to the sound quality of each part of the horn 2, and the impedances of each part of the horn 2 are sufficiently coupled, thereby realizing multi-stage resonance in a small volume and widening the frequency band range.

[0024] In this embodiment, the bending radius of the connection portion between the first segment 21 and the second segment 22 is greater than four times the minimum wavelength. As shown in Figures 10 to 11, simulations show that excellent acoustic transmission performance can be achieved when the bending radius exceeds four times the minimum wavelength.

[0025] Preferably, the sound output direction of the first segment 21 and the third segment 23 is bent by 90° by the second segment 22, so that the volume of the horn is reduced, and by designing according to the cross section of the curved path, it can be adapted to the housing of the mobile terminal, and has excellent retraction effect.

[0026] In this embodiment, the inner diameter of the connection between the first segment 21 and the second segment 22 is smaller than half the wavelength. Inner diameter is half wavelength Greater than In this case, high-frequency sound waves are inverted at the bending points, resulting in sound blocking. By using bending dimensions smaller than half the wavelength for horn 2, its high-frequency blocking can be improved and its bandwidth can be widened. Based on the theoretical basis of the transmission line model, the vertical direction of horn 2 is designed with variable cross sections of different areas or lengths and widths, and lofting is performed. This ensures that the dimensions of the variable cross sections are directly related to the sound quality of each part of the horn, and the impedance of each part of horn 2 is fully coupled, achieving multi-stage resonance.

[0027] In this embodiment, the speaker box 1 has a rectangular shape, and the sound output opening 11 is provided on a side in the short direction of the speaker box.

[0028] Specifically, after being inserted into the housing of a mobile terminal, the frequency response curve of the symmetrical horn 2 produces a very deep bottom at 11.5 kHz. As shown in Figure 12, at this frequency, a sound pressure node appears along the horizontal axis of the speaker, and the sound output is at a pit bottom. The sound output port increases along the vertical axis, changing the sound pressure intensity on both sides of the horizontal axis, improving the bottom at 11.5 kHz and resulting in good acoustic performance.

[0029] In this embodiment, there are a plurality of horns 2, and the first segments of the horns 2 are arranged side by side in the width direction of the speaker box 1, the second segments 22 of the horns 2 are alternately stacked and installed in the thickness direction of the speaker box 1, and the third segments 23 of the horns 2 are arranged side by side in the length direction of the speaker box 1. Preferably, the number of horns 2 is two, three, four, etc., and is specifically selected according to actual needs.

[0030] Specifically, the speaker uses multiple layers of horns 2, controlling the width of each single-layer horn 2 to be less than half a wavelength, improving the cutoff frequency of the horns 2, smoothing audio transmission, and enhancing high-frequency performance. Gradually varying the cross sections of the two horns 2, the first and second segments 21 and 22, combine the resonance peaks of each horn 2 and enhance high-frequency performance. At the same time, the volume and space requirements are reduced, and the lengths of the multiple first and second segments 21 and 22 can be extended to increase the number of resonance frequencies. The multiple horn 2 sections control multi-stage resonance, achieving a high-frequency enhancement effect for multiple frequencies.

[0031] Preferably, when there are three horns 2, the three horns 2 are arranged in parallel or cross each other. Two horns 2 may be arranged in parallel, with one horn 2 overlapping one of the two horns 2 or being arranged between the two horns. Multiple horn 2 sections can control multi-stage resonance, achieving a high-frequency enhancement effect for multiple frequencies.

[0032] In this embodiment, the second segment 22 and / or the third segment 23 are filled with a sound-absorbing material to increase the damping of the horn 2, compensate for the response curve of the symmetrical horn 2, and improve high-frequency performance.

[0033] Specifically, as shown in Figure 13, comparing the SPL curve of the ori with the SPL curve of ori + internal impedance 1100 Pa*s / m + extended space, the symmetrical horn 2 from the speaker's horizontal sound output side to the device's audio output opening 11 creates a pit bottom at the high frequency position, and a small chamber is filled with damping material to increase the pipe damping, flattening the high frequency SPL curve. Increasing the local volume changes the acoustic capacity and further controls the resonant frequency point.

[0034] In this embodiment, the first segment 21 includes a first opening 211 that engages with the sound output opening 11, a first opening 212 connected to one end of the second segment 22, and a first side wall 213 and a second side wall 214 that extend from the first opening 211 to the first opening 212, and both ends of the first opening 211 gradually decrease in diameter toward the first opening 212 to form the first arc-shaped surface 5. Sound from the speaker box 1 is transmitted to the first opening 212 through the sound output opening 11 via the first opening 211, and both ends of the first opening 211 gradually decrease in diameter toward the first opening 212 to form the first arc-shaped surface 5. Since the bottom surface of the first segment 21 is a flat surface 4 and the top surface is the first arc-shaped surface 5, the cross section of the first segment 21 of the horn 2 gradually changes, improving the sound quality of the horn.

[0035] Here, the opening at one end of the horn is a first opening 211 , which is the horn port 9 and is used to connect to the sound output opening 11 .

[0036] In this embodiment, the length of the first opening 211 is greater than the length of the first opening 212, and the width of the first opening 211 is smaller than the width of the first opening 212. This makes it easier to collect the sound output from the sound output opening 11, resulting in high sound quality.

[0037] In this embodiment, the second segment 22 includes a third opening 221 that engages with the first opening 212, a fourth opening 222 connected to one end of the third segment 23, and a third side wall 223 and a fourth side wall 224 that are formed by bending and extending from the third opening 221 to the fourth opening 222. The third opening 221 is used to transmit sound output from the first opening 212 to the fourth opening 222 and output the sound via the fourth opening 222. The first segment 21 and the second segment 22 have different cross-sectional structures, and the thicknesses of the first opening 211, the first opening 212, and the fourth opening 222 increase in stages, thereby causing sound to resonate in multiple stages and widening the range of the frequency band.

[0038] In this embodiment, the thickness of the third opening 221 is the same as the thickness of the first opening 212 .

[0039] In this embodiment, the fourth side wall 224 has a semicircular cross section parallel to the thickness direction of the speaker box 1. This is easy to manufacture.

[0040] In this embodiment, the third side wall 223 and the fourth side wall 224 are disposed vertically, which makes it easier to bend the second segment 22 and saves installation space.

[0041] In this embodiment, the third segment 23 includes a fifth opening 231 that engages with the fourth opening 222, a fifth side wall 233 and a sixth side wall 234 that extend from the fifth opening 231 in a direction away from the fourth opening 222, and a sixth opening 232 that is connected between the fifth side wall 233 and the sixth side wall, and the first side wall 213, the third side wall 223, and the fifth side wall 233 together surround the retracted position 3. This can be adapted to various housings.

[0042] Here, the opening at the other end of the horn is a sixth opening 232, which is the throat 10 of the horn.

[0043] In this embodiment, the third segment 23 protrudes toward both sides parallel to the thickness direction of the speaker box 1 to form the third arcuate surface 7 and the fourth arcuate surface.

[0044] 14, the sensitivity at the same frequency of the conventional side sounding module 2 in this embodiment is lower than the sensitivity of the multi-stage horn plus sound outlet matching model 1, the initial two-stage horn 3, the initial two-stage horn plus sound absorbing material 4, the multi-stage variable cross-section horn 5, the multi-stage variable cross-section horn plus sound absorbing material 6, and the large rear chamber module forward sounding 7. Therefore, as can be seen from the above test results, compared to the conventional side sounding module 2, each of the technical solutions with horns improves the high frequency band, and here, the multi-stage horn matching plus sound outlet matching model 1 has higher frequency bandwidth and frequency response drift than the other technical solutions.

[0045] Compared with the related art, the speaker module of the present invention is used in a mobile terminal equipped with a sound outlet, the speaker module comprises a speaker box, the speaker box has an audio output opening for side sound emission, and the speaker module further comprises a horn connected to the audio output opening, the horn is hollow and open at both ends, one end of the horn is connected to the side of the speaker box and communicates with the audio output opening, and the other end of the horn is used to connect to the sound outlet of the mobile terminal, the cross-sectional area of the horn along the sound output direction gradually changes, and the horn is designed with a variable cross-section having different areas or lengths and widths and is lofted, so that the dimensions of the variable cross-section are directly related to the sound quality of each part of the horn, and the impedance of each part of the horn is fully coupled, thereby realizing multi-stage resonance in a small volume and widening the frequency band range, and its small volume and flexible escape space make it easy to fit into the housings of different mobile terminals.

[0046] The above is merely an embodiment of the present invention, and those skilled in the art to which the present invention pertains may make modifications without departing from the spirit of the present invention, all of which should be included in the scope of protection of the present invention.

Claims

1. A speaker module for use in a mobile terminal provided with a sound output port, the speaker module includes a speaker box; the speaker box has a sound output opening for side sound emission, the speaker module further comprises a horn connected to the audio output opening; The horn is hollow and open at both ends; one end of the horn is connected to a side surface of the speaker box and communicates with the sound output opening; the other end of the horn is used to connect to a sound output port of the mobile terminal; The horn has a cross-sectional area that gradually changes along the sound output direction, the horn comprises a first segment connected to the sound output opening, a second segment bent and extending from one end of the first segment remote from the speaker box and spaced apart from the speaker box, and a third segment formed by extending from one end of the second segment remote from the first segment, a bending radius of a connection portion between the first segment and the second segment is greater than four times the minimum wavelength, and an inner diameter of the connection portion between the first segment and the second segment is smaller than half the wavelength; A speaker module, characterized in that the minimum wavelength is the wavelength of a sound wave at the connection portion, and the half wavelength is half the wavelength of the minimum wavelength.

2. 2. The speaker module of claim 1, wherein the horn has a top surface and a bottom surface spaced apart along the thickness direction of the speaker box, and two side surfaces connecting the bottom surface and the top surface, and the bottom surface and / or the top surface are curved.

3. 3. The speaker module of claim 2, wherein the third segment is used to connect to a sound output port of the mobile terminal, the bottom surfaces corresponding to the first segment and the second segment are both flat, the top surface corresponding to the first segment is a first arc-shaped surface, the top surface corresponding to the second segment is a second arc-shaped surface, the bottom surface and the top surface corresponding to the third segment are a third arc-shaped surface and a fourth arc-shaped surface, respectively, and the first arc-shaped surface, the second arc-shaped surface, the third arc-shaped surface and the fourth arc-shaped surface have different degrees of curvature.

4. 3. The speaker module according to claim 2, wherein the speaker box is rectangular, and the sound output opening is located on a side of the speaker box in a longitudinal direction.

5. 5. The speaker module of claim 4, wherein the horns are multiple, the multiple first segments of the multiple horns are arranged side by side along the short side of the speaker box, the multiple second segments of the multiple horns are arranged alternately stacked along the thickness direction of the speaker box, and the multiple third segments of the multiple horns are arranged side by side along the length direction of the speaker box.

6. 4. The speaker module according to claim 3, wherein the second segment and / or the third segment is filled with a sound absorbing material.

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