Loudspeaker module

Abstract

The present application belongs to the technical field of electro-acoustic conversion, and provides a loudspeaker module for a mobile terminal provided with a sound outlet, wherein the loudspeaker module comprises a loudspeaker box, the loudspeaker box comprises a sound output opening for side sound emission, and the loudspeaker module further comprises a horn connected with the sound output opening, the horn is hollow and has two open ends, one end of the horn is connected to the side of the loudspeaker box and communicates with the sound output opening, and the other end of the horn is used for connecting to the sound outlet of the mobile terminal; the cross-sectional area along the sound outlet direction of the horn is gradually changed; the variable cross-section with different areas or different lengths and widths is designed on the horn to carry out lofting, so that the variable cross-section size is directly related to the sound quality of each part of the horn; the horn adopts the transmission line network theory to optimize the local impedance of the horn, small-size multi-stage resonance is realized, and the frequency band range is widened. Compared with the related art, the present application can realize multi-stage resonance, has small size, is convenient for widening the frequency band range, and has flexible avoidance space.

Description

[Technical Field]

[0001] This invention relates to the field of electroacoustic conversion technology, and more particularly to a loudspeaker module. [Background Technology]

[0002] With the development of electroacoustic conversion technology, it is now applied in terminal electronic devices such as computers, mobile phones, MP4 players, and PDAs. Along with the continuous progress and development of the electronics industry and science and technology, audiences inevitably place higher demands on the acoustic performance of loudspeakers, leading to the widespread application of loudspeaker modules in various terminal devices.

[0003] In this related technology, the horn of the loudspeaker has both its top and bottom surfaces flat along the thickness direction of the terminal device; the top surface is parallel to the upper shell surface of the terminal device, and the bottom surface is parallel to the lower shell surface of the terminal device; the horn extends from the horn mouth to the horn throat in both the thickness direction and the length direction perpendicular to the terminal device. This allows for the combination of a miniature loudspeaker and a horn, achieving a low resonant frequency F0 and high loudness, even under the constraint of a relatively thin terminal device.

[0004] However, the horn of the related technology is large in size, has high requirements for shape expansion, cannot flexibly form avoidance space, and has poor resonance effect.

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

[0006] The technical problem to be solved by the present invention is to provide a speaker module that is small in size, flexible in avoiding space, has good multi-level harmonic effects, and effectively widens the frequency band.

[0007] To address the aforementioned technical problems, this invention provides a speaker module for a mobile terminal with a sound outlet. The speaker module includes a speaker enclosure with a sound output opening for side sound emission. The speaker module also includes a horn connected to the sound output opening. The horn is hollow and open at both ends. One end of the horn is connected to the side of the speaker enclosure and communicates with the sound output opening. 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 gradually changes along the sound emission direction.

[0008] Preferably, the horn includes a top surface and a bottom surface spaced apart along the thickness direction of the loudspeaker enclosure, and two side surfaces connecting the bottom surface and the top surface respectively, wherein the bottom surface and / or the top surface is curved.

[0009] Preferably, the horn includes a first segment connected to the sound output opening, a second segment extending from the end of the first segment away from the speaker enclosure and spaced apart from the speaker enclosure, and a third segment extending from the end of the second segment away from the first segment. The third segment is used to connect to the sound outlet of the mobile terminal. The bottom surfaces of the first and second segments are both flat, the top surface of the first segment is a first arc-shaped surface, the top surface of the second segment is a second arc-shaped surface, and the bottom and top surfaces of the third segment are a third arc-shaped surface and a fourth arc-shaped surface, respectively. The curvature of the first, second, third, and fourth arc-shaped surfaces is different.

[0010] Preferably, the bending radius at the connection between the first segment and the second segment is greater than 4 times the minimum wavelength.

[0011] Preferably, the inner diameter at the connection between the first segment and the second segment is less than half a wavelength.

[0012] Preferably, the speaker enclosure is rectangular, and the sound output opening is located on the short axis side of the speaker enclosure.

[0013] Preferably, the horn comprises a plurality of horns, wherein a plurality of first segments of the plurality of horns are arranged side by side along the width direction of the loudspeaker enclosure, a plurality of second segments of the plurality of horns are arranged in an alternating layered manner along the thickness direction of the loudspeaker enclosure, and a plurality of third segments of the plurality of horns are arranged side by side along the length direction of the loudspeaker enclosure.

[0014] Preferably, the second segment and / or the third segment are filled with sound-absorbing material.

[0015] Compared with related technologies, the speaker module of the present invention is used in a mobile terminal with a sound outlet. The speaker module includes a speaker box, which includes a sound output opening for side sound emission. The speaker module also includes a horn connected to the sound 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 sound output opening. 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 gradually changes along the sound emission direction. By designing the horn with a variable cross-section of different area or length and width for lofting, the variable cross-sectional size is directly related to the sound quality of each part of the horn. The impedance of each part of the horn is fully coupled, thereby realizing small-volume multi-level resonance, widening the frequency band range. At the same time, the small size allows for flexible space avoidance to adapt to the casing of different mobile terminals. [Attached Image Description]

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0017] Figure 1 This is a schematic diagram of the axisymmetric structure of the speaker module of the present invention;

[0018] Figure 2 This is a left view of the speaker module of the present invention, symmetrical to the axis of view.

[0019] Figure 3 for Figure 1 Exploded view;

[0020] Figure 4 for Figure 1 A structural diagram of the first segment;

[0021] Figure 5 for Figure 1 A structural diagram of the second segment;

[0022] Figure 6 for Figure 1 A structural diagram of the third segment;

[0023] Figure 7 This is a schematic diagram of the overlapping multi-horn structure of the loudspeaker module of the present invention;

[0024] Figure 8 This is a schematic diagram of the axisymmetric structure of the sound-absorbing material of the loudspeaker module of the present invention to reduce the volume of the horn;

[0025] Figure 9 for Figure 8 A sectional view symmetrical about the AA line axis;

[0026] Figure 10 This is a SPL curve of the transmission frequency response of the loudspeaker module of the present invention;

[0027] Figure 11 This is a graph showing the change in sound pressure impedance of the loudspeaker module of the present invention.

[0028] Figure 12 This is a matching SPL curve diagram of the speaker module of the present invention;

[0029] Figure 13 The sound pressure level (SPL) curve of the loudspeaker module of the present invention when it is filled with attenuating material is shown.

[0030] Figure 14 This is a graph showing the SPL (Sound Performance Level) curve of the loudspeaker module of the present invention.

Detailed Implementation Methods

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figure 1-9 As shown, a speaker module 100 is provided for a mobile terminal (not shown) with a sound outlet (not shown). The speaker module 100 includes a speaker enclosure 1, which includes a sound output opening 11 for side sound emission. The speaker module 100 also 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 enclosure 1 and communicates with the sound output opening 11. The other end of the horn 2 is used to connect to the sound outlet of the mobile terminal. Along the sound emission direction of the horn 2, the cross-sectional area of ​​the horn 2 gradually changes. By designing the horn 2 with a variable cross-section of different area or length and width for lofting, the variable cross-sectional size is directly related to the sound quality of each part of the horn 2, and the impedance of each part of the horn 2 is fully coupled, thereby realizing small-volume multi-stage resonance and widening the frequency band. At the same time, its small size allows for flexible space avoidance to adapt to the casings of different mobile terminals.

[0033] Optionally, the mobile terminal can be a mobile phone, computer, tablet, etc. By adapting the speaker module 100 into the mobile terminal and assembling the speaker box 1 and the mobile terminal through the horn 2, the acoustic performance of the mobile terminal can be improved.

[0034] In this embodiment, the horn 2 includes a top surface and a bottom surface spaced apart along the thickness direction of the loudspeaker box 1, and two side surfaces that connect the bottom surface and the top surface respectively, wherein the bottom surface and / or the top surface is curved.

[0035] The loudspeaker in the loudspeaker enclosure 1 includes a diaphragm. In the loudspeaker enclosure 1 where sound is emitted from this side, the vibration direction of the diaphragm is the thickness direction of the loudspeaker enclosure 1. By setting the top and bottom surfaces of the horn 2 at intervals in the thickness direction, and the two side surfaces respectively connecting the bottom and top surfaces, the cross-section of the horn 2 in the sound emission direction has a gradual effect, realizing multi-level resonance and widening the frequency band.

[0036] In this embodiment, the horn 2 includes a first segment 21 connected to the sound output opening 11, a second segment 22 extending from the first segment 21 away from the speaker enclosure 1 and spaced apart from the speaker enclosure, and a third segment 23 extending from the end of the second segment 22 away from the first segment. The third segment 23 is used to connect to the sound outlet of a mobile terminal. The bottom surfaces of the first segment 21 and the second segment 22 are both planes 4. The top surface of the first segment 21 is a first arc-shaped surface 5, the top surface of the second segment 22 is a second arc-shaped surface 6, and the bottom and top surfaces of the third segment 23 are a third arc-shaped surface 7 and a fourth arc-shaped surface 10, respectively. The curvatures of 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 are all different.

[0037] Specifically, the sound output opening 11 on the sound-emitting side of the loudspeaker enclosure 1 is connected to the horn 2 to transmit the sound emitted by the loudspeaker enclosure 1, thereby improving the acoustic performance of the loudspeaker enclosure 1. Since the horn 2 includes a first section 21, a second section 22, and a third section 23, by designing the horn 2 with a variable cross-section of different areas or lengths and widths for lofting, the variable cross-section size is 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 small-volume multi-stage resonance and widening the frequency band.

[0038] In this embodiment, the bending radius at the connection between the first segment 21 and the second segment 22 is greater than four times the minimum wavelength. For example... Figure 10-11 As shown in the figure, simulations demonstrate that excellent acoustic transmission performance can only be achieved when the bending radius exceeds four times the minimum wavelength.

[0039] Preferably, the sound output directions of the first segment 21 and the third segment 23 are bent at 90° at the second segment 22, which makes the horn small in size. The design is based on the cross-section of the curved path, which can be adapted to the casing of the mobile terminal and has a good avoidance effect.

[0040] In this embodiment, the inner diameter of the connection between the first segment 21 and the second segment 22 is less than half a wavelength. When the radius of the horn 2 is less than half a wavelength, the high-frequency sound wave reverses direction after passing through the bend, resulting in sound cutoff. If the horn 2 adopts a bend size less than half a wavelength, its high-frequency cutoff will be improved, and the bandwidth will be widened. Based on the transmission line model, the horn 2 is designed vertically with a variable cross-section of varying area or length and width for lofting. The variable cross-section size is directly related to the acoustic quality of each part of the horn, and the impedance of each part of the horn 2 is fully coupled to achieve multi-stage resonance.

[0041] In this embodiment, the speaker enclosure 1 is rectangular, and the sound output opening 11 is located on the short axis side of the speaker enclosure.

[0042] Specifically, by adding a housing hole to the mobile terminal, the symmetrical horn's frequency response curve exhibits an extremely deep valley at 11.5kHz; for example... Figure 12 As shown, this frequency has a sound pressure point in the horizontal axis direction of the speaker, resulting in a valley in the sound output; adding a sound output port in the vertical axis direction changes the sound pressure intensity on both sides of the horizontal axis, improving the 11.5kHz valley value, and resulting in good acoustic performance.

[0043] In this embodiment, the horns 2 include multiple horns. Multiple first segments of the multiple horns 2 are arranged side-by-side along the width direction of the loudspeaker enclosure 1. Multiple second segments 22 of the multiple horns 2 are staggered and stacked along the thickness direction of the loudspeaker enclosure 1. Multiple third segments 23 of the multiple horns 2 are arranged side-by-side along the length direction of the loudspeaker enclosure 1. Optionally, the number of horns 2 can be 2, 3, 4, etc., depending on actual needs.

[0044] Specifically, by utilizing multiple overlapping layers of horn 2 in the loudspeaker, and controlling the width of each horn 2 layer to be less than half a wavelength, the cutoff frequency of the horn 2 is increased, achieving smooth sound transmission and improving high-frequency performance. By gradually changing the cross-section of the first segment 21 and the second segment 22 of the horn 2, the resonant peaks of each horn 2 are coupled, further enhancing high-frequency performance. Simultaneously, this reduces volume and space requirements by extending the length of multiple first segments 21 and second segments 22, increasing the number of resonant frequencies. Through multi-stage resonance control of multiple horn 2 sections, a high-frequency enhancement effect at multiple frequencies is achieved.

[0045] Preferably, when there are three horns 2, the three horns 2 are arranged side by side or intersecting each other. Alternatively, two horns 2 can be arranged side by side, with one horn 2 overlapping one of the other two horns 2 or positioned between the two horns 2. By partially controlling multi-stage resonance through multiple horns 2, a high-frequency boosting effect at multiple frequencies can be achieved.

[0046] In this embodiment, the second segment 22 and / or the third segment 23 are filled with sound-absorbing material. Filling with sound-absorbing material increases the damping of the horn 2, compensates for the symmetrical horn 2 response curve, and improves high-frequency performance.

[0047] Specifically, such as Figure 13 As shown in the figure, the SPL curve of ori is compared with the SPL curve of ori + internal impedance 1100Pa*s / m + extended space. The symmetrical horn 2 from the sound output side of the speaker to the sound output opening 11 of the device in the horizontal direction produces a valley at the high frequency position. By filling the small cavity with attenuating material to increase the pipe damping, the high frequency SPL curve is smoothed out. By increasing the local volume, the acoustic capacitance is changed, thereby achieving control of the resonant frequency point.

[0048] In this embodiment, the first segment 21 includes a first opening 211 that abuts against the sound output opening 11, a first opening 212 connected to one end of the second segment 22, and a first sidewall 213 and a second sidewall 214 extending from the first opening 211 toward the first opening 212. The two ends of the first opening 211 gradually decrease in size towards the first opening 212 to form the first arc-shaped surface 5. The sound of the speaker box 1 is transmitted through the sound output opening 11 to the first opening 212. Since the two ends of the first opening 211 gradually decrease in size towards the first opening 212 to form the first arc-shaped surface 5, the bottom surface of the first segment 21 is a plane 4 and the top surface is the first arc-shaped surface 5, so that the cross-section of the first segment 21 of the horn 2 has a gradually changing shape, thereby improving the sound quality of the horn 2.

[0049] The horn has a first opening 211 at one end, which is the horn mouth 9 and is used to connect to the sound output opening 11.

[0050] 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 less than the width of the first opening 212. This facilitates the focusing of the sound output from the sound output opening 11, resulting in good sound quality.

[0051] In this embodiment, the second segment 22 includes a third opening 221 that mates with the first opening 212, a fourth opening 222 connected to one end of the third segment 23, and a third sidewall 223 and a fourth sidewall 224 formed by bending and extending from the third opening 221 to the fourth opening 222. The third opening 221 is used to transmit the sound output from the first opening 212 to the fourth opening 222, and the sound is transmitted out through the fourth opening 222. By using the different cross-sectional structures of the first segment 21 and the second segment 22, and by progressively increasing the thickness of the first opening 211, the first opening 212, and the fourth opening 222, multi-level resonance of the sound can be achieved, thus widening the frequency band.

[0052] In this embodiment, the thickness of the third opening 221 is the same as the thickness of the first opening 212.

[0053] In this embodiment, the fourth sidewall 224 has a semi-circular cross-section parallel to the thickness direction of the speaker enclosure 1. This facilitates manufacturing.

[0054] In this embodiment, the third sidewall 223 and the fourth sidewall 224 are arranged perpendicularly. This facilitates bending of the second segment 22 and saves installation space.

[0055] In this embodiment, the third segment 23 includes a fifth opening 231 that mates with the fourth opening 222, a fifth sidewall 233 and a sixth sidewall 234 extending from the fifth opening 231 away from the fourth opening 222, and a sixth opening 232 connecting the fifth sidewall 233 and the sixth sidewall. The first sidewall 213, the third sidewall 223, and the fifth sidewall 233 together form the clearance position 3. This design can accommodate various housings.

[0056] The other end of the horn has an opening called the sixth opening 232, which is the horn waiting opening 10.

[0057] In this embodiment, the third segment 23 protrudes to both sides parallel to the thickness direction of the speaker box 1 to form the third arc-shaped surface 7 and the fourth arc-shaped surface.

[0058] In this embodiment, such as Figure 14 As shown, the sensitivity of the conventional side-emitting module 2 at the same frequency is lower than that of the multi-stage horn with sound outlet matching model 1, the initial version of the two-stage horn 3, the initial version of the two-stage horn with sound-absorbing material 4, the multi-stage variable cross-section horn 5, the multi-stage variable cross-section horn with sound-absorbing material 6, and the large rear cavity module with positive sound emission 7. Therefore, the test results above show that, compared with the conventional side-emitting module 2, all horn-equipped schemes have improved high-frequency bandwidth; among them, the bandwidth and frequency response fluctuation of the multi-stage horn matching with sound outlet matching model 1 are higher than those of other schemes.

[0059] Compared with related technologies, the speaker module of the present invention is used in a mobile terminal with a sound outlet. The speaker module includes a speaker box, which includes a sound output opening for side sound emission. The speaker module also includes a horn connected to the sound 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 sound output opening. The other end of the horn is used to connect to the sound outlet of the mobile terminal. Along the sound emission direction of the horn, the cross-sectional area of ​​the horn gradually changes. By designing the horn with a variable cross-section of different area or length and width for lofting, the variable cross-sectional size is 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 small-volume multi-level resonance, widening the frequency band range. At the same time, the small size allows for flexible space avoidance to adapt to the casing of different mobile terminals.

[0060] The above description is merely an embodiment of the present invention. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements all fall within the protection scope of the present invention.

Claims

1. A speaker module for a mobile terminal having a sound outlet, the speaker module comprising a speaker enclosure, the speaker enclosure including a sound output opening for side sound emission, characterized in that, The speaker module also includes a horn connected to the sound 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 sound output opening. 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 gradually changes along the sound output direction. The horn includes a top surface and a bottom surface spaced apart along the thickness direction of the loudspeaker enclosure, and two side surfaces respectively connecting the bottom surface and the top surface, wherein the bottom surface and / or the top surface is curved. The horn includes a first segment connected to the sound output opening, a second segment extending from the end of the first segment away from the speaker enclosure and spaced apart from the speaker enclosure, and a third segment extending from the end of the second segment away from the first segment. The third segment is used to connect to the sound outlet of the mobile terminal. The bottom surfaces of the first and second segments are both flat, the top surface of the first segment is a first arc-shaped surface, the top surface of the second segment is a second arc-shaped surface, and the bottom and top surfaces of the third segment are a third arc-shaped surface and a fourth arc-shaped surface, respectively. The curvature of the first, second, third, and fourth arc-shaped surfaces is different. The bending radius at the connection between the first segment and the second segment is greater than 4 times the minimum wavelength; the inner diameter at the connection between the first segment and the second segment is less than half a wavelength.

2. The speaker module according to claim 1, characterized in that, The speaker enclosure is rectangular, and the sound output opening is located on the short axis side of the speaker enclosure.

3. The speaker module according to claim 2, characterized in that, The horn includes multiple horns, with multiple first segments of the multiple horns arranged side by side along the width direction of the loudspeaker enclosure, multiple second segments of the multiple horns arranged in an alternating layered manner along the thickness direction of the loudspeaker enclosure, and multiple third segments of the multiple horns arranged side by side along the length direction of the loudspeaker enclosure.

4. The speaker module according to claim 1, characterized in that, The second and / or third segments are filled with sound-absorbing material.

Images