Speaker module and portable electronic device using the speaker module

Abstract

The present invention provides a speaker module, which includes a speaker, which includes a sound hole, a front cavity and a rear cavity communicating with the sound hole, and a driver located between the front cavity and the rear cavity for separating the front cavity and the rear cavity; and an acoustic speaker connected to the speaker, which includes an input port, which is communicated with the front cavity through the sound hole; a pair of output ports, which lead to the outside of the acoustic speaker; and a pair of channels, each channel connecting the input port with the corresponding output port; wherein each of the channels has a cross section, the area of ​​the cross section gradually increases in the direction from the input port to the corresponding output port, and the area of ​​the cross section of each channel on the same plane is equal. The speaker module of the present invention improves the high-frequency performance of sound waves and reduces the distortion of low-frequency sound waves. The present invention also provides a portable electronic device using the speaker module.

Description

Technical Field

[0001] The present invention relates to the technical field of loudspeakers, and in particular to a loudspeaker module and a portable electronic device using the loudspeaker module. Background Art

[0002] As people's living standards continue to improve, people have put forward higher requirements on the sound quality of speaker modules used in portable devices such as mobile phones and tablets. The common problem of traditional thin speaker modules consisting of a front cavity on the top of the speaker module and a narrow port leading to the outside of the portable device is that it is difficult to achieve a practical cavity / port combination design to produce a high enough resonance frequency to ensure the reproduction of the entire audio range (up to 20kHz). To date, acoustic speakers for speaker modules in portable devices are usually provided as accessories such as brackets or covers, so they require a lot of space. Conventional acoustic speakers cannot be precisely matched with the speakers of speaker modules, so they can only improve the efficiency of the speaker in the mid-range but cannot provide high-frequency extension. Conventional cavity / port structures for extending high-frequency response will require very short and wide ports, which is not suitable for some portable devices.

[0003] Therefore, it is necessary to provide an improved loudspeaker to overcome at least one of the above problems. Summary of the invention

[0004] In view of the above problems, an object of the present invention is to provide a speaker module that improves the high-frequency performance of sound waves and reduces the distortion of low-frequency sound waves.

[0005] To solve the above technical problems, an embodiment of the present invention provides a speaker module including a speaker, which includes a sound hole, a front cavity and a rear cavity communicating with the sound hole, and a driver located between the front cavity and the rear cavity for separating the front cavity and the rear cavity; and an acoustic horn connected to the speaker, which includes: an input port, which is communicated with the front cavity through the sound hole; a pair of output ports, leading to the outside of the acoustic horn; and a pair of channels, each channel connecting the input port with the corresponding output port; wherein each of the channels has a cross-section, the area of ​​the cross-section gradually increases in the direction from the input port to the corresponding output port, and the area of ​​the cross-section of each channel on the same plane is equal.

[0006] Preferably, the channel comprises a pair of channel side walls and a pair of channel connecting walls respectively connected to the channel side walls; the cross-sectional dimensions of the channel side walls of the pair of channels located in the same plane are equal.

[0007] Preferably, the size of the channel connecting wall gradually increases in the direction from the input port to the corresponding output port, or the size of the channel side wall remains unchanged in the direction from the input port to the corresponding output port.

[0008] Preferably, at least one of the channel side wall and the channel connecting wall is curved.

[0009] Preferably, the distance between two adjacent channel side walls of the pair of channels gradually decreases in the direction from the input port to the corresponding output port.

[0010] Preferably, the acoustic horn is structurally symmetrical about a midline between the pair of channels.

[0011] Preferably, the acoustic horn is asymmetrical in structure about a midline between the pair of channels.

[0012] Preferably, two ends of two adjacent channel side walls of the pair of channels close to the pair of output ports are spaced apart from each other.

[0013] Preferably, two ends of two adjacent channel side walls of the pair of channels close to the pair of output ports are connected to each other.

[0014] Preferably, portions of the pair of channels adjacent to the input port are symmetrical in structure, while other portions away from the input port have the same shape.

[0015] Preferably, the speaker module further comprises a mounting portion located between the pair of channels, the speaker is mounted on the mounting portion, and the input port is provided on the mounting portion.

[0016] Preferably, the speaker module further comprises an expansion cavity communicating with the mounting portion.

[0017] A portable electronic device comprises the speaker module as described above, a shell with a sound outlet, an inner frame received in the shell, and a sound outlet channel provided on the inner frame and connected to the sound outlet, wherein the sound outlet channel is communicated with an output port.

[0018] The acoustic speaker of the speaker module of the present invention comprises a pair of channels. Each channel connects the input port with the corresponding output port. Each channel has a cross section, the area of ​​the cross section gradually increases in the direction from the input port to the corresponding output port, and the area of ​​the cross section of each channel on the same plane is equal. The high-frequency performance of the sound wave can be improved and the distortion of the low-frequency sound wave can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to explain the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the drawings used to describe the embodiments. Obviously, the drawings in the following description only relate to some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 is a stereoscopic view of a speaker module according to a first embodiment of the present invention;

[0021] Figure 2 is a cross-sectional view of a speaker in a speaker module according to the present invention;

[0022] Figure 3 is a stereoscopic view of an acoustic speaker in a speaker module according to the present invention;

[0023] Figure 3A for Figure 3 The cross-section along line AA is shown;

[0024] Figure 3B for Figure 3 The cross-section along line BB is shown;

[0025] Figure 4 is a plan view of an acoustic speaker of a speaker module according to a second embodiment of the present invention;

[0026] Figure 5 is a stereoscopic view of an acoustic speaker of a speaker module according to a third embodiment of the present invention;

[0027] Figures 6 to 8 An acoustic horn having a speaker module having one or more expansion chambers is shown;

[0028] Figures 9a-9d A schematic structural diagram of a portable electronic device provided with a speaker module according to an embodiment of the present invention is shown;

[0029] Fig.10a and Fig.10b An acoustic horn of a speaker module is shown, which has one or more curved portions;

[0030] Fig.11a and Fig.11b An acoustic horn of a speaker module is shown, which is bent to form a concave arc structure;

[0031] Fig.12a and Figure 12b An acoustic horn of a speaker module is shown, the channel of which has an elongated structure. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to the accompanying drawings. It should be noted that elements of similar structure or function are represented by similar reference numerals throughout the accompanying drawings. The embodiments described herein are not intended to be exhaustive or descriptive of various other embodiments, nor are they intended to be limiting of the scope of the claims or of some other embodiments that would be apparent to one skilled in the art in view of the embodiments described in the present invention. In addition, an embodiment does not necessarily have all the aspects or advantages shown.

[0033] Reference Figure 1 to Figure 2 The speaker module 10 according to the first embodiment of the present invention includes a speaker 20 and an acoustic horn 40 connected to the speaker 20. The speaker 20 includes a front cavity 22, a sound hole 24 communicating with the front cavity 22, a rear cavity 26, and a driver 28 located between the front cavity 22 and the rear cavity 26. The driver 28 is used to separate the front cavity 22 and the rear cavity 26.

[0034] Continue to refer to Figure 3 The acoustic horn 40 includes an input port 42 for communicating with the front cavity 22 of the speaker 20 through the sound hole 24; a pair of output ports 44 leading to the outside of the acoustic horn 40; and a pair of channels 46, each channel 46 communicating the input port 42 with a corresponding output port 44.

[0035] Preferably, the channel 46 has a cross section whose area gradually increases in the direction from the input port 42 to the corresponding output port 44, which can both increase the highest frequency of the sound waves generated by the speaker 20 and make the high-frequency resonance of the sound waves less sharp. In the present invention, the cross section is perpendicular to the direction from the input port 42 to the corresponding output port 44.

[0036] Preferably, the cross-sectional areas of the pair of channels 46 located in the same plane are substantially equal to each other, so that the two channels 46 are substantially acoustically symmetrical to each other. Therefore, after the acoustic horn 40 is connected to the speaker 20, the two substantially acoustically symmetrical channels 46 of the acoustic horn 40 are connected to the front cavity 22 of the speaker 20, thereby avoiding the quarter-wave resonance caused by using an acoustically asymmetrical structure, which will cause the wave to tilt, thereby reducing the high-frequency output.

[0037] Continue to refer to Figure 3 and Figure 3A In this embodiment, the cross section of the channel 46 is rectangular, and includes a pair of channel connecting walls 468 and a pair of channel side walls 466. The size of the channel connecting walls 468 gradually increases in the direction from the input port 42 to the corresponding output port 44, and the size of the channel side walls 466 remains unchanged in the direction from the input port 42 to the corresponding output port 44. The cross-sectional sizes of the channel connecting walls 468 of the two channels 46 located in the same plane are substantially equal to each other.

[0038] Reference Figure 3 and Figure 3B In this embodiment, the acoustic speaker 40 further includes a hollow mounting portion 48 for mounting on the speaker 20. The mounting portion 48 includes a pair of spaced mounting side walls 482 and a pair of spaced mounting connecting walls 484, respectively connected between opposite ends of the mounting side walls 482. A cavity 481 is formed between the spaced mounting side walls 482 and the spaced mounting connecting walls 484. Preferably, the mounting connecting wall 484 has a rectangular shape. When the speaker module 10 is used for a mobile phone, the height of the cavity 481 is preferably in the range of 0.7 mm to 1 mm. When the speaker module 10 is used for a notebook computer, the height of the cavity 481 may be greater than 1 mm. The depth of the mounting portion 48 may be greater than the depth of the channel 46, because the long-stroke driver 28 may require more clearance than the channel 46. The input port 42 is provided in one of the mounting connecting walls 482 connected to the mounting portion 48. The pair of channels 46 extend from opposite sides of the mounting portion 48 and communicate with the input port 42 through the cavity 481 formed inside the mounting portion 48. A space 469 is formed between two adjacent channel side walls 466 of the channel 46 and one mounting side wall 482 of the mounting portion 48. Preferably, the mounting portion 48 and the channel 46 are integrally formed. The channel side walls 466 and the mounting side walls 482 of the mounting portion 48 adjacent to the space 469 are connected together to form a dome or an arch. The distance between the two adjacent channel side walls 466 of the channel 46 gradually decreases in the direction from the input port 42 to the corresponding output port 44. The ends of the two adjacent channel side walls 466 of the channel 46 near the output port 44 are connected to each other. At least a portion of the channel side walls 466 or the channel connecting wall 468 of the channel 46 is curved to increase the length and cross-sectional area of ​​the channel 46, thereby improving high-frequency performance and reducing distortion of low-frequency sound waves.

[0039] Reference Figure 4 In the second embodiment of the present invention, the structure of the acoustic horn 40 is symmetrical about the center line M between the channels 46. Figure 5 In the third embodiment of the present invention, the ends of two adjacent channel side walls 466 of the channel 46 near the output port 44 are spaced apart from each other. The acoustic horn 40 has a U-shaped structure. The acoustic horn 40 is asymmetrical in structure around the center line M between the channels 46. The portion of the channel 46 near the mounting portion 48 is symmetrical in structure around the center line M, while the other portion of the channel 46 away from the mounting portion 48 has substantially the same shape. One of the two adjacent channel side walls 466 of the channel 46 is parallel to the center line M of the channel 46, and the distance between the center line M and the other of the two adjacent channel side walls 466 of the channel 46 gradually decreases in the direction from the mounting portion 48 to the output port 44.

[0040] Reference Figure 6 In an optional embodiment, the acoustic speaker 40 further includes an expansion cavity 49 connected to the mounting portion 48. The expansion cavity 49 has sufficient damping to reduce unwanted resonance. Specifically, the expansion cavity 49 is connected to the side of the mounting portion 48 away from the space 469 and communicates with the cavity 481 of the mounting portion 48. Preferably, a sound absorbing layer 50 is covered on one side of the expansion cavity 49 connected to the mounting portion 48, which helps to reduce the sharpest resonance peak. The sound absorbing layer 50 can be made of an acoustic mesh material.

[0041] Reference Figure 7 In an optional embodiment, the expansion cavity 49 is connected to one side of the adjacent space 469 of the mounting portion 48.

[0042] Reference Figure 8 In an optional embodiment, the acoustic horn 40 includes two expansion chambers 49 respectively connected to two mounting side walls 482 of the mounting portion 48 .

[0043] Reference Figure 9a The structure schematic diagram of the portable electronic device 100 provided with the speaker module 10 of this embodiment is shown. The electronic device 100 includes a housing 104 having a sound outlet 102, an inner frame 106 accommodated in the housing 104, and a sound outlet channel 108 provided on the inner frame 106 and communicating with the sound outlet 102. Furthermore, a sealing member 109 is sandwiched between the inner frame 106 and the housing 104 of the electronic device 100. The sealing member 109 is a gasket or an adhesive. When the speaker module 10 is installed in the electronic device 100, the sound outlet channel 108 communicates with the output port 44. The output port 44 of the acoustic speaker 40 and the sound outlet 102 of the electronic device 100 are at the same level in the depth direction of the acoustic speaker 40. That is, the midline of the output port 44 in the depth direction is coplanar with the midline of the sound outlet 102 of the electronic device 100. The sound outlet channel 108 extends horizontally in the depth direction perpendicular to the acoustic speaker 40.

[0044] Reference Figure 9b In an optional embodiment, the output port 44 of the acoustic speaker 40 and the sound outlet 102 of the electronic device 100 may be at different levels in the depth direction of the acoustic speaker 40. That is, the center line of the output port 44 in the depth direction is not coplanar with the center line of the sound outlet 102 of the electronic device 100. In this embodiment, the inner frame 106 defines an L-shaped sound outlet channel 108, which connects the output port 44 of the acoustic speaker 40 with the sound outlet 102 of the device 100.

[0045] Reference Fig.9cIn an optional embodiment, the sound outlet channel 108 extends vertically in a direction parallel to the depth direction of the acoustic speaker 40 .

[0046] Reference Figure 9d In an optional embodiment, the sound outlet channel 108 extends obliquely relative to the depth direction of the acoustic speaker 40.

[0047] The passage 46 of the acoustic horn 40 may be straight, or curved / folded, such as Fig.10a and Fig.10b As shown, it has one or more curved portions 462.

[0048] The channel 46 may have a uniform depth. Alternatively, the channel 46 may have a non-uniform depth. In an alternative embodiment, the depth of the channel 46 gradually increases in a direction from the driver 28, the mounting portion 48 to the output port 44. Fig.11a and Fig.11b As shown, the mounting portion 48 is bent to form a concave arc structure, so that the depth of the channel 46 gradually increases in the direction from the driver 28, the mounting portion 48 to the output port 44. Fig.11b In the embodiment shown, the channels 46 have a uniform width.

[0049] Reference Figure 12a-12b In some embodiments, if the internal space of the electronic device 100, such as a tablet or a personal computer, is available, the length of the channel 46 can be extended by bending the channel 46 around the mounting portion 48 connected to the speaker. The curved channel 46 can also be two layers, one layer above the other, such as Figure 12b as shown in .

[0050] In the present invention, the electronic device 100 may be a mobile phone, a PAD, a notebook computer, etc.

[0051] The present invention enables the use of an acoustic speaker within the available space of a portable electronic device. Measurements and listening tests have demonstrated that it can achieve the desired high frequency performance and reduce distortion at low frequencies. The acoustic speaker 40 improves the acoustic loading of the highest frequencies and overcomes the physical distance problem between the speaker and the outer surface of the portable electronic device.

[0052] Although the present invention has been described with reference to one or more embodiments, the description of the above embodiments is only intended to enable those skilled in the art to practice or use the present invention. It should be understood by those skilled in the art that various modifications are possible without departing from the spirit or scope of the present invention. The embodiments described above should not be construed as limiting the present invention, and the scope of the present invention should be determined with reference to the claims that follow.

Claims

1. A speaker module, It is characterized in that The speaker module comprises: A loudspeaker comprising a sound hole, a front cavity and a rear cavity communicating with the sound hole, and a driver located between the front cavity and the rear cavity for separating the front cavity and the rear cavity; and An acoustic horn, connected to the speaker, comprising: an input port communicating with the front cavity through the sound hole; a pair of output ports leading to the exterior of the acoustic horn; and a pair of channels, each channel connecting the input port with the corresponding output port, the channel comprising a pair of channel side walls and a pair of channel connecting walls respectively connected to the channel side walls; the cross-sectional dimensions of the channel side walls of the pair of channels located in the same plane are equal; Each of the channels has a cross section, the area of ​​the cross section gradually increases in a direction from the input port to the corresponding output port, and the area of ​​the cross section of each of the channels on the same plane is equal.

2. The speaker module according to claim 1, It is characterized in that The dimensions of the channel connecting walls gradually increase in the direction from the input port to the corresponding output port; or The dimensions of the channel sidewalls remain constant in the direction from the input port to the corresponding output port.

3. The speaker module according to claim 1, It is characterized in that At least one of the channel side wall and the channel connecting wall is curved.

4. The speaker module according to claim 1, It is characterized in that The distance between two adjacent channel side walls of the pair of channels gradually decreases in the direction from the input port to the corresponding output port.

5. The speaker module according to claim 1, It is characterized in that The acoustic horn is structurally symmetrical about a midline between the pair of channels.

6. The speaker module according to claim 1, It is characterized in that The acoustic horn is structurally asymmetrical about a midline between the pair of channels.

7. The speaker module according to claim 1, It is characterized in that Two ends of two adjacent channel side walls of the pair of channels close to the pair of output ports are spaced apart from each other.

8. The speaker module according to claim 1, It is characterized in that Two ends of two adjacent channel side walls of the pair of channels close to the pair of output ports are connected to each other.

9. The speaker module according to claim 1, It is characterized in that Portions of the pair of channels adjacent to the input port are symmetrical in structure, while other portions away from the input port have the same shape.

10. The speaker module according to claim 1, It is characterized in that The speaker module further includes a mounting portion located between the pair of channels, the speaker is mounted on the mounting portion, and the input port is disposed on the mounting portion.

11. The speaker module according to claim 10, It is characterized in that The speaker module further includes an expansion cavity communicating with the mounting portion.

12. A portable electronic device, It is characterized in that The portable electronic device comprises a speaker module according to claims 1-11, a shell having a sound outlet, an inner frame accommodated in the shell, and a sound outlet channel provided on the inner frame and connected to the sound outlet, wherein the sound outlet channel is communicated with an output port.

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