Speaker module

Abstract

The present invention belongs to the technical field of electroacoustic conversion. The present invention provides a speaker module for a mobile terminal provided with a sound outlet. The speaker module includes a speaker box, the speaker box 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 a hollow structure, the sound output opening includes a first sound output opening arranged in the horizontal axis direction of the speaker box and a second sound output opening arranged in the longitudinal axis direction of the speaker box, the horn includes a first section connected to the first sound output opening, a second section bent and extended from one end of the first section away from the first sound output opening, and a third section, the end of the second section away from the first section is used to connect to the sound outlet; the two ends of the third section are respectively connected to the second sound output opening and the second section. Compared with the related art, the present invention can achieve multi-stage resonance, small volume, easy to widen the frequency band range and easy to adapt to mobile terminals.

Description

[Technical field]

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

[0002] With the development of electroacoustic conversion technology, it has been applied to terminal electronic devices such as computers, mobile phones, MP4, PDA, etc. With the continuous progress and development of the electronics industry and science and technology, the audience will inevitably put forward higher requirements for the acoustic performance of speakers, making speaker modules widely used in various terminal devices.

[0003] The top and bottom surfaces of the horn of the speaker in the related art are both planes in 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 is extended from the horn mouth to the horn throat in the direction perpendicular to the thickness direction of the terminal device and the length direction of the horn. Therefore, under the premise of the constraint that the thickness of the terminal device is relatively thin, the speaker box and the horn are combined to achieve the purpose of low resonance frequency F0 and high loudness.

[0004] However, the horn of the related art is large in size, has high requirements for shape expansion, poor housing adaptation effect, and 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 with small volume, good housing adaptation effect, good multi-stage harmonic effect and effective widening of frequency band range.

[0007] To solve the above technical problems, the present invention provides a speaker module for a mobile terminal provided with a sound outlet, the speaker module comprising a speaker box, the speaker box comprising a sound output opening for side sound emission, the speaker module also comprising a horn connected to the sound output opening, the horn having a hollow structure, the sound output opening comprising a first sound output opening arranged at intervals in the horizontal axis direction of the speaker box and a second sound output opening arranged in the longitudinal axis direction of the speaker box, the horn comprising a first section connected to the first sound output opening, a second section bent and extended from one end of the first section away from the first sound output opening, and a third section, the end of the second section away from the first section being used for connecting to the sound outlet; the two ends of the third section are respectively connected to the second sound output opening and the second section.

[0008] Preferably, the speaker box is rectangular, the first sound output opening is located on one of the long axis sides of the speaker box, and the second sound output opening is located on one of the short axis sides of the speaker box; the second section is bent and extended from the first section to a plane beyond the short axis side of the speaker box where the second sound output opening is located.

[0009] Preferably, the cross-sectional area of ​​the first section gradually decreases along the sound emitting direction; the cross-sectional area of ​​the second section gradually increases along the sound emitting direction; and the cross-sectional area of ​​the third section remains unchanged along the sound emitting direction.

[0010] Preferably, the bottom surface of the first section is a first plane, the top surface of the first section is a sloped surface, the bottom surface of the second section is a second plane, the top surface of the second section includes an arcuate surface and a third plane connected to the arcuate surface, the bottom surface and the top surface of the third section are both fourth planes, wherein the first plane and the second plane are the same plane.

[0011] Preferably, the second section has an axisymmetric structure along a center line of its sound emitting direction.

[0012] Preferably, the second section is trumpet-shaped.

[0013] Preferably, the horn comprises a plurality of horns, wherein the plurality of the first sections of the horns are arranged side by side along the long axis direction of the speaker box, the plurality of the second sections of the horns are arranged in staggered layers along the thickness direction of the speaker box, and the plurality of the third sections of the horns are arranged side by side along the short axis direction of the speaker box.

[0014] Preferably, the second section and / or the third section is filled with sound absorbing material.

[0015] Compared with the related art, the speaker module of the present invention is provided with a sound output opening on the side of the speaker box, and the horn is connected to the sound output opening, the horn is a hollow structure, the sound output opening includes a first sound output opening arranged in the horizontal axis direction of the speaker box and a second sound output opening arranged in the longitudinal axis direction of the speaker box, the horn includes a first section connected to the first sound output opening, a second section bent and extended from one end of the first section away from the first sound output opening, and a third section, the end of the second section away from the first section is used to connect to the sound outlet; the two ends of the third section are respectively connected to the second sound output opening and the second section; by arranging the horn into three parts, the symmetrical horn from the sound output side in the horizontal axis direction of the speaker to the sound output opening generates multi-stage resonance, thereby widening the frequency band range; the horn from the sound output side in the longitudinal axis direction of the speaker to the third section of the sound output opening of the device compensates for the symmetrical horn response curve, eliminates the high-frequency frequency response drop caused by the casing hole, and further improves the high-frequency performance; at the same time, the volume is small, the space utilization rate is high, and it is easy to adapt to the casing of different terminal devices.

Brief Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. 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 work, among which:

[0017] Figure 1 It is a structural schematic diagram of the speaker module of the present invention;

[0018] Figure 2 An exploded view of the speaker module of the present invention;

[0019] Figure 3 It is a right side view of the speaker module of the present invention;

[0020] Figure 4 It is a structural schematic diagram of the speaker module of the present invention without the third section;

[0021] Figure 5 It is a schematic diagram of the structure of the overlapping multi-horn of the loudspeaker module of the present invention;

[0022] Figure 6 The matching SPL curve diagram of the speaker module of the present invention;

[0023] Figure 7 The sound pressure level SPL curve diagram of the speaker module of the present invention when filled with attenuation material;

[0024] Figure 8The SPL curve diagram is an acoustic performance test result of the speaker module of the present invention. [Specific implementation method]

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1-4 As shown, a speaker module 100 is provided for a mobile terminal (not shown in the figure) provided with a sound outlet 9, the speaker module 100 includes a speaker box 1, the speaker box 1 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 a hollow structure, the sound output opening 11 includes a first sound output opening 111 arranged at intervals in the horizontal axis direction of the speaker box 1 and a second sound output opening 112 arranged in the longitudinal axis direction of the speaker box 1, the horn 2 includes a first section 21 connected to the first sound output opening 111, a second section 22 bent and extended from one end of the first section 21 away from the first sound output opening 111, and a third section 23, the end of the second section 22 away from the first section 21 is used for connecting to the sound outlet 9; the two ends of the third section 23 are respectively connected to the second sound output opening 112 and the second section 22.

[0027] Among them, the sound outlets 9 include multiple ones and are evenly distributed side by side, so the sound effect is uniform and the acoustic performance is good.

[0028] Specifically, the speaker box 1 is used to emit sound, and the sound output opening 11 is used to transmit the sound of the speaker box 1. The sound output opening 11 is connected to the horn 2, and the horn 2 is a hollow structure, which is used to transmit the sound emitted by the speaker box 1 to the sound outlet 9 of the mobile terminal, and the sound is propagated through the sound outlet 9, thereby improving the acoustic performance of the speaker module 100.

[0029] Specifically, the sound output opening 11 includes a first sound output opening 111 and a second sound output opening 112 arranged in a longitudinal direction of the speaker box 1 at intervals. The first sound output opening 111 and the second sound output opening 112 are arranged on the side of the speaker box 1 to achieve sound output. Optionally, the side may be the same side, an adjacent side or a corresponding side, etc. When the symmetrical horn 2 from the sound output side in the long axis (X-axis) direction of the speaker to the sound output opening 11 produces multi-stage resonance, the frequency band range is widened; the third horn 2 from the sound output side in the short axis (Y-axis) direction of the speaker box 1 to the device sound output opening 11 compensates for the response curve of the symmetrical horn 2, further improving the high-frequency performance. Optionally, the long axis is the horizontal axis and the short axis is the vertical axis.

[0030] Among them, by connecting the first sound output opening 111 to the first section 21, the second sound output opening 112 to the third section 23, the two ends of the third section 23 are respectively connected to the second sound output opening 112 and the second section 22; the outer opening of the second section 22 is arranged corresponding to the sound outlet 9, which facilitates the transmission of sound. At the same time, the speaker module 100 has a small overall volume and high space utilization, which is convenient for adapting to the casings of different mobile terminals and has a good adaptation effect. No attenuation material needs to be filled, and the cost is low.

[0031] In this embodiment, the speaker box 1 is rectangular, the first sound output opening 111 is located on one of the long axis sides of the speaker box 1, and the second sound output opening 112 is located on one of the short axis sides of the speaker box 1; the second section 22 is bent from the first section 21 and extends to a plane beyond the short axis side of the speaker box 1 where the second sound output opening 112 is located. This allows the symmetrical horn from the sound output side in the long axis direction of the speaker to the sound output opening to generate multi-stage resonance, thereby widening the frequency band range.

[0032] In this embodiment, when the horn 2 only includes the first section 21 and the second section 22, the sound output opening 11 is set on one side of the speaker box 1, and the sound is transmitted from the first section 21 to the second section 22 in sequence through the sound output opening 11, and then output from the second section 22 to the outside of the casing through the sound outlet 9, so that the acoustic performance of the mobile terminal is good.

[0033] In this embodiment, the cross-sectional area of ​​the first section 21 gradually decreases along the sound emitting direction; the cross-sectional area of ​​the second section 22 gradually increases along the sound emitting direction; and the cross-sectional area of ​​the third section 23 remains unchanged along the sound emitting direction.

[0034] Since the thin wall thicknesses of the first section 21 and the second section 22 are consistent, when the thickness of the first section 21 increases gradually along the sound emitting direction toward the second section 22, the horn 2 is extended, which can achieve multi-stage resonance, improve high-frequency radiation capability, and widen the frequency band.

[0035] In this embodiment, the bottom surface of the first section 21 is a first plane 3, the top surface of the first section 21 is an inclined surface 4, the bottom surface of the second section 22 is a second plane 5, the top surface of the second section 22 includes an arc surface 6 and a third plane 7 connected to the arc surface 6, and the bottom surface and top surface of the third section 23 are both fourth planes 8, wherein the first plane 3 and the second plane 5 are the same plane. By setting the bottom surfaces of the first section 21, the second section 22, and the third section 23 to be planes, it is convenient to install them in a mobile terminal, with a wide contact surface and high stability. Since the top surface of the first section 21 is an inclined surface 4, the top surface of the second section 22 includes an arc surface 6 and a third plane 7 connected to the arc surface 6, and the cross-sectional sizes of the various parts of the horn 2 are different, the impedances of the various parts of the horn 2 are fully coupled, thereby achieving a small volume multi-stage resonance and widening the frequency band range.

[0036] In this embodiment, the second section 22 has an axisymmetric structure along the center line of the sound output direction thereof. The axisymmetric structure enables the sound transmission of the second section 22 to be evenly dispersed to the sound output port 9, and the acoustic performance is good.

[0037] In this embodiment, the second section 22 is horn-shaped, which is convenient for improving high-frequency radiation capability and widening the frequency band.

[0038] Specifically, after adding the housing hole of the mobile terminal, the frequency response curve of the symmetrical horn 2 produces a very deep valley value at 11.5kHz; Figure 6 As shown, a sound pressure node appears in the long axis direction of the speaker at this frequency, resulting in a valley in the sound output; adding a sound output port in the short axis direction changes the sound pressure intensity on both sides of the long axis, increasing the 11.5kHz valley value, and achieving good acoustic performance.

[0039] In this embodiment, if Figure 5 As shown, the horn 2 includes a plurality of horns 2, wherein the first sections 21 of the horns 2 are arranged side by side along the long axis direction of the speaker box 1, the second sections 22 of the horns 2 are arranged in a staggered stack along the thickness direction of the speaker box 1, and the third sections 23 of the horns 2 are arranged side by side along the short axis direction of the speaker box 1. Optionally, the number of the horns 2 is 2, 3, 4, etc., which is selected according to actual needs.

[0040] Specifically, by using the overlapping of multiple layers of the speaker horn 2, the width of the single-layer horn 2 is controlled to be less than half the wavelength, the cutoff frequency of the horn 2 is increased, the sound transmission is smoothed, and the high-frequency performance is improved. By gradually changing the cross-section of the first section 21 and the second section 22 of the horn 2, the resonance peaks of each horn 2 are coupled to improve the high-frequency performance. At the same time, the volume and space requirements can be reduced, the length of the two first sections 21 and the second section 22 can be extended, and the number of resonant frequencies can be increased. By controlling the multi-stage resonance through multiple horn 2 parts, the high-frequency enhancement effect of multiple frequencies can be achieved.

[0041] Preferably, when there are three horns 2, the three horns 2 are arranged side by side or cross each other. Alternatively, two horns 2 may be arranged side by side, with one horn 2 overlapping one of the two horns 2 or arranged between the two horns 2. Multiple horns 2 partially control multi-stage resonance to achieve high-frequency enhancement effects at multiple frequencies.

[0042] In this embodiment, the second section 22 and / or the third section 23 are filled with sound absorbing material. By filling the sound absorbing material, the damping of the horn 2 is increased, the response curve of the symmetrical horn 2 is compensated, and the high-frequency performance is improved.

[0043] Specifically, Figure 7 As shown in the figure, the SPL curve of ori is compared with the SPL curve of ori+internal impedance 1100Pa*s / m+expansion space. It can be seen that the symmetrical horn 2 from the sound output side of the speaker in the long axis direction to the sound output opening 11 of the device produces a pit at the high frequency position. The small cavity is filled with attenuation material to increase the pipeline damping and smooth the high-frequency SPL curve. By increasing the local volume and changing the sound capacity, the resonant frequency point can be controlled.

[0044] In this embodiment, Figure 8 As shown, the sensitivity of the conventional side-sounding module 2 at the same frequency is lower than that of the multi-stage horn plus sound outlet matching model 1, the first version of the second-stage horn 3, the first version of the second-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 cavity module positive sound 7. Therefore, it can be seen from the above test results that compared with the conventional side-sounding module 2, all kinds of horn solutions have improved high-frequency bands; among them, the bandwidth and frequency response fluctuation of the multi-stage horn matching plus sound outlet matching model 1 are higher than other solutions.

[0045] Compared with the related art, the speaker module of the present invention is provided with a sound output opening on the side of the speaker box, and the horn is connected to the sound output opening, the horn is a hollow structure, the sound output opening includes a first sound output opening and a second sound output opening which are arranged at intervals on the side of the speaker box, the horn includes a first section connected to the first sound output opening, a second section and a third section which are bent and extended from one end of the first section away from the first sound output opening, the end of the second section away from the first section is used to connect to the sound outlet; the two ends of the third section are respectively connected to the second sound output opening and the second section; by arranging the horn into three parts, the symmetrical horn from the sound output side in the long axis direction of the speaker to the sound output opening generates multi-stage resonance, thereby widening the frequency band range; the horn from the sound output side in the short axis direction of the speaker to the third section of the sound output opening of the device compensates for the symmetrical horn response curve, thereby further improving the high-frequency performance; at the same time, the volume is small, the space utilization rate is high, and it is easy to adapt to the casings of different terminal devices.

[0046] The above description is only an implementation mode of the present invention. It should be pointed out that, for ordinary technicians in this field, improvements can be made without departing from the creative concept of the present invention, but these all belong to the protection scope of the present invention.

Claims

1. A speaker module for a mobile terminal provided with a sound outlet, the speaker module comprising a speaker box, the speaker box comprising 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 a hollow structure, the sound output opening includes a first sound output opening arranged in the horizontal axis direction of the speaker box and a second sound output opening arranged in the longitudinal axis direction of the speaker box, the horn includes a first section connected to the first sound output opening, a second section bent and extended from one end of the first section away from the first sound output opening, and a third section, the end of the second section away from the first section is used to connect to the sound outlet; the two ends of the third section are respectively connected to the second sound output opening and the second section.

2. The speaker module according to claim 1, characterized in that: The speaker box is rectangular, the first sound output opening is located on one of the long axis sides of the speaker box, and the second sound output opening is located on one of the short axis sides of the speaker box; the second section is bent and extended from the first section to a plane beyond the short axis side of the speaker box where the second sound output opening is located.

3. The speaker module according to claim 2, characterized in that: The cross-sectional area of ​​the first section gradually decreases along the sound emitting direction; the cross-sectional area of ​​the second section gradually increases along the sound emitting direction; and the cross-sectional area of ​​the third section remains unchanged along the sound emitting direction.

4. The speaker module according to claim 3, characterized in that: The bottom surface of the first section is a first plane, the top surface of the first section is an inclined surface, the bottom surface of the second section is a second plane, the top surface of the second section includes an arcuate surface and a third plane connected to the arcuate surface, and the bottom surface and top surface of the third section are both fourth planes; wherein the first plane and the second plane are the same plane.

5. The speaker module according to claim 3, characterized in that: The second section has an axisymmetric structure along a center line of its sound emitting direction.

6. The speaker module according to claim 3, characterized in that: The second section is trumpet-shaped.

7. The speaker module according to claim 1, characterized in that: The horn comprises a plurality of horns, wherein the plurality of the first sections of the horns are arranged side by side along the long axis direction of the speaker box, the plurality of the second sections of the horns are arranged in staggered layers along the thickness direction of the speaker box, and the plurality of the third sections of the horns are arranged side by side along the short axis direction of the speaker box.

8. The speaker module according to claim 1, characterized in that: The second section and / or the third section is filled with sound absorbing material.

Images