A speaker module and smart wearable device

Abstract

The present application discloses a speaker module and a smart wearable device. The speaker module of the present application includes: a module shell, a speaker unit is housed in the module shell, the speaker unit divides the module inner cavity into a front sound cavity and a rear sound cavity, the main sound outlet of the speaker module is arranged on the first side wall of the front sound cavity, and the distance from the center position of the speaker unit to the second side wall opposite to the main sound outlet is not less than 8.5mm; the speaker module also includes a sound guide tube, the sound guide tube includes a sound wave lead-in part and a secondary sound outlet hole for radiating sound waves, the sound wave lead-in part is arranged on the second side wall, and the sound guide tube leads the sound waves of the second side wall to the side of the main sound outlet through the sound wave lead-in part. The technical solution of the present application can solve the problem of standing wave interference, while improving the near-field sound wave loudness and enhancing the sound effect of the speaker module.

Description

Technical Field

[0001] The present application relates to the technical field of electroacoustic conversion, and in particular to a speaker module and a smart wearable device. Background Art

[0002] With the popularization and popularization of smart wearable devices, more and more smart wearable devices are combined with acoustic functions. For example, compared with traditional headphones, smart wearable devices such as audio glasses and portable headsets use near-ear external speaker technology, which will neither cause auditory fatigue nor damage hearing after long-term listening, and have won the favor of users.

[0003] As smart wearable devices continue to develop in the direction of being light, thin, and compact, the speaker modules, as the acoustic components of smart wearable devices, are also constantly developing in the direction of being light, thin, and compact. Therefore, technicians are designing more and more speaker modules as front-cavity side-sound structures. However, the speaker modules of smart wearable devices are different from miniaturized electronic terminals such as traditional mobile phones. The front sound cavity of the speaker modules of smart wearable devices is longer. The front-cavity side-sound structure makes it impossible for most of the sound waves emitted by the speaker unit to be radiated directly, but must be reflected by the front cavity wall before they can be radiated from the sound outlet. At this time, the sound waves reflected by the front cavity wall and the sound waves propagating inward interact with each other to produce resonant standing waves, which seriously affect the sensitivity of the speaker module in certain frequency bands and reduce the acoustic performance of the module. Summary of the invention

[0004] The embodiments of the present application provide a speaker module and a smart wearable device, which effectively improve the problem of reduced sensitivity of the speaker module due to standing waves and improve the acoustic performance of the smart wearable device.

[0005] The present application embodiment adopts the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a speaker module, comprising: a module housing, a speaker unit is housed in the module housing, the speaker unit divides the module inner cavity into a front sound cavity and a rear sound cavity, a main sound outlet of the speaker module radiates the sound waves of the front sound cavity to the outside through a first sound wave lead-out portion provided on a first side wall of the front sound cavity, and a distance from a center position of the speaker unit to a second side wall opposite to the main sound outlet is not less than 8.5 mm;

[0007] The speaker module also includes a sound guide tube, which includes a second sound wave lead-in portion and a secondary sound outlet hole for radiating sound waves. The second sound wave lead-in portion is arranged on the second side wall, and the sound guide tube leads the sound waves of the second side wall to the side of the main sound outlet hole through the second sound wave lead-in portion.

[0008] Optionally, the auxiliary sound outlet and the main sound outlet are different sound wave radiation ports, and the distance between the auxiliary sound outlet and the main sound outlet is smaller than a preset distance value.

[0009] Optionally, the auxiliary sound outlet and the main sound outlet are the same sound wave radiation port, and the auxiliary sound outlet and the main sound outlet export sound waves from opposite sides of the front sound cavity and radiate sound waves from the same port.

[0010] Optionally, the acoustic phase of the sound waves derived from the sound guide tube is the same as that of the sound waves derived from the main sound outlet hole.

[0011] Optionally, the speaker unit is a rectangular structure, and the main sound outlet is located on the first short axis side of the rectangular structure;

[0012] The second sound wave lead-in portion is located at the second short axis side of the rectangular structure, or the second sound wave lead-in portion is located at a position where the second short axis side and the long axis side of the rectangular structure are connected.

[0013] Optionally, the speaker unit is a runway-type structure, the straight side of the runway-type structure is the long axis side of the speaker unit, and the arc side is the short axis side of the speaker unit; the first sound wave lead-out part is located on the first short axis side, and the second sound wave lead-out part is located on the second short axis side.

[0014] Optionally, the sound guide tube further comprises a connecting portion located between the second sound wave lead-out portion and the auxiliary sound outlet hole, wherein the size of the cross section of the second sound wave lead-out portion is different from the size of the cross section of the connecting portion.

[0015] Optionally, the sound guide tube further includes a sound guide tube main body located between the connecting portion and the auxiliary sound outlet hole, and the cross-sectional dimensions of the second sound wave lead-out portion, the connecting portion and the sound guide tube main body are different from each other.

[0016] Optionally, the main body of the sound guide tube is a structure with a gradually changing cross-sectional size from the connecting portion to the auxiliary sound outlet.

[0017] Optionally, the cross-sections of the sound guide tube body at different positions are the same, specifically, the sound guide tube is a pipe formed by combining multiple sections with the same caliber, or an integrated pipe with the same caliber.

[0018] Optionally, the sound guide tube is located in the physical space above the diaphragm in the speaker module;

[0019] Alternatively, the sound guide tube occupies the physical space on the upper and lower sides of the diaphragm in the speaker module, and the sound guide tube and the sound leakage hole of the rear sound cavity are independent of each other.

[0020] Optionally, the speaker module of the embodiment of the present application includes a plurality of sound guide tubes, and the second sound wave lead-out portions of the plurality of sound guide tubes are located at different positions of the second side wall.

[0021] Optionally, at least part of the module housing is the entire housing of the smart wearable device.

[0022] Optionally, the length L of the sound guide tube has a value range of 0.8 mm ≤ L ≤ 120 mm.

[0023] In a second aspect, an embodiment of the present application further provides a smart wearable device, comprising: a device frame, in which at least one speaker module is installed, and the speaker module is the speaker module mentioned above.

[0024] Optionally, the smart wearable device includes a complete housing, and at least part of the module housing is the complete housing.

[0025] At least one of the above technical solutions adopted in the embodiments of the present application can achieve the following beneficial effects:

[0026] The main sound outlet of the speaker module of the embodiment of the present application is located on the side wall of the speaker unit. The speaker unit divides the entire module cavity into a front sound cavity and a rear sound cavity. When the distance between the sound source and the reflection surface of the front sound cavity (i.e., the side wall of the front sound cavity relative to the sound outlet) is one-quarter wavelength at certain frequencies, the superposition of the emitted sound wave and the reflected sound wave will form standing wave interference in the front sound cavity. In the embodiment of the present application, a sound guide tube is arranged on the side of the front sound cavity opposite to the main sound outlet, and the reflected sound wave is guided to the outside of the speaker module through the sound guide tube to avoid standing wave interference between the reflected sound wave and the emitted sound wave, thereby improving the sensitivity in the mid- and high-frequency bands. In addition, the newly provided sound guide tube in the embodiment of the present application guides the sound waves on the side of the front sound cavity relative to the main sound outlet to the side of the main sound outlet, so that the secondary sound outlet connected to the sound guide tube can also radiate sound waves using the near-ear external sound technology, thereby enhancing the loudness of the sound waves radiated by the speaker module and improving the acoustic performance of the smart wearable device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0028] Figure 1 A schematic diagram of a simulation effect of a speaker module shown in an embodiment of the present application;

[0029] Figure 2 It is a schematic diagram of the exploded structure of the speaker module shown in the embodiment of the present application;

[0030] Figure 3 For the embodiment shown in this application Figure 2 A cross-sectional view of the loudspeaker module shown;

[0031] Figure 4 A schematic diagram of the appearance of a speaker module shown in an embodiment of the present application;

[0032] Figure 5 For the embodiment shown in this application Figure 4 A cross-sectional view of the loudspeaker module shown;

[0033] Figure 6For the embodiment shown in this application Figure 4 A schematic diagram of the structure of the speaker module shown;

[0034] Figure 7 It is a simulation schematic diagram of the auxiliary sound outlet and its sound guide tube shown in the embodiment of the present application;

[0035] Figure 8 This is a schematic diagram of a sound guide tube shown in an embodiment of the present application being located in the physical space below the speaker module;

[0036] Fig. 9 A schematic diagram of a frequency response curve of a speaker module in the related art;

[0037] Fig.10 A schematic diagram showing a comparison of frequency response curves of the speaker module shown in the embodiment of the present application;

[0038] In the figure: auxiliary shell 10, module upper shell 11, module lower shell 12, first side wall 13, second side wall 14, first surface 15, second surface 16, speaker unit 20, diaphragm 21, auxiliary sound outlet 30, sound guide tube main body 31, second sound wave lead-in part 32, main body port 33, connecting part 34, main sound outlet 40, main sound tube 41, first sound wave lead-in part 42, another port 43 of main sound tube 41, front sound cavity 50, rear sound cavity 60. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0040] The upper directions mentioned in this application refer to the direction of the vibration system of the speaker unit, and the lower directions refer to the direction of the magnetic circuit system of the speaker unit; the inner side mentioned in this application refers to the side located inside the inner cavity of the module, and the outer side refers to the side located outside the inner cavity of the module.

[0041] The technical solutions provided by various embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0042] According to the speaker module of the first aspect of the present application, Figure 2 As shown, the speaker module of this embodiment includes a module housing, and the module housing includes, for example, Figure 2The module upper shell 11 and the module lower shell 12 are shown, and the speaker unit 20 is accommodated in the module shell.

[0043] Here, the speaker unit 20 includes a vibration system and a magnetic circuit system. The vibration system includes a diaphragm 21 whose edge is fixed on the outer shell of the speaker unit. A dome is fixed to the middle part of the side of the diaphragm 21 close to the lower shell 12 of the module. A voice coil is fixed to the other side of the diaphragm. The winding tap of the voice coil is the voice coil lead. The magnetic circuit system includes a basin frame fixed to the lower shell 12 of the module. The basin frame includes a rectangular bottom. The four sides of the bottom are provided with side walls perpendicular to the bottom. The center position of the bottom is fixed with a magnet and a washer in sequence. A magnetic gap is provided between the magnet and the washer and the side wall of the basin frame. The voice coil is provided in the magnetic gap. The voice coil moves up and down in the magnetic gap according to the size and direction of the audio-frequency electrical signal passing through its winding. The diaphragm 21 vibrates with the up and down movement of the voice coil, instigating the air to make sound, thereby completing the energy conversion between electricity and sound.

[0044] Combination Figure 2 and Figure 6 As shown, the speaker unit 20 divides the inner cavity of the speaker module into two cavities, the front sound cavity 50 and the rear sound cavity 60, and the module shell is provided with a main sound outlet 40 connecting the front sound cavity 50 with the outside. The first sound wave lead-out portion 42 of the main sound outlet 40 is provided on the first side wall 13 of the front sound cavity 50, and the main sound outlet 40 radiates the sound waves of the front sound cavity 50 to the outside through the first sound wave lead-out portion 42 provided on the first side wall 13 of the front sound cavity 50.

[0045] Generally, the module upper shell 11, a part of the module lower shell 12, the diaphragm 21 and the auxiliary shell 10 together form a front sound cavity 50, and the diaphragm 21, the auxiliary shell 10 and another part of the module lower shell 12 together form a rear sound cavity 60. With the two surfaces of the diaphragm as reference, the first diaphragm surface with the dome mounted is in the front sound cavity 50, and the second diaphragm surface opposite to the first diaphragm surface is in the rear sound cavity 60.

[0046] Here, this embodiment exemplarily shows that the module housing includes a module upper housing 11 and a module lower housing 12. In actual applications, the module housing may also be other structures, such as a combination of more housings, or an integral molding. Optionally, at least part of the module housing is the entire housing of the smart wearable device.

[0047] It should be noted that, in the embodiment of the present application, the first side wall 13 is the front sound cavity side wall on the first short axis side of the speaker unit 20, and the front sound cavity side wall is a part of the module shell, and the second side wall 14 is the front sound cavity side wall on the second short axis side of the speaker unit 20 in the front sound cavity, the first side wall 13 and the second side wall 14 are two opposite side walls of the front sound cavity, and the distance between the first side wall 13 and the second side wall 14 is greater than 17 mm.

[0048] For a speaker module that emits sound from the side (i.e., the main sound outlet is located on the side of the module), when the sound waves radiated by the speaker unit 20 are transmitted to the second side wall 14 opposite to the main sound outlet 40, the sound waves will be reflected. When the distance between the center of the speaker unit and the second side wall 14 is λ / 4, the distance after reflection when the sound waves reach the center of the speaker unit is λ / 2. At this time, the sound waves will be superimposed and canceled, and a standing wave phenomenon will occur, where λ is the wavelength of the sound wave. For conventional mobile phone speakers, the length of the speaker is usually relatively small, and the standing wave valley appears after 10KHz, which has no obvious impact on the listening experience.

[0049] The speaker module used in smart wearable devices for side-emitting sound has a relatively narrow and long speaker unit, and the corresponding front sound cavity is a narrow and long structure, so the standing wave trough will shift to the low frequency. When the standing wave trough appears in the frequency band below 10KHz, it will significantly affect the user's listening experience.

[0050] For a side-sound speaker module with the main sound outlet located on the short axis side, when the distance between the center of the speaker unit and the second side wall is about 8.5 mm, a standing wave phenomenon will appear at 10 KHz. When the distance between the center of the speaker unit and the second side wall is greater than 8.5 mm, a standing wave trough will appear within 10 KHz, which will seriously affect the user's listening experience. The value 8.5 in this embodiment is based on a large number of statistical experimental verifications, and this value is related to the sound wave frequency band that can be perceived by the human ear.

[0051] The main sound outlet is located on the side of the short axis of the speaker unit, which makes the speaker module with a narrow front sound cavity prone to standing wave interference. Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the speaker module of this embodiment also includes a sound guide tube, which includes a second sound wave lead-in portion 32 and a secondary sound outlet hole 30 for radiating sound waves. The second sound wave lead-in portion 32 is arranged on the second side wall 14, and the secondary sound outlet hole 30 is arranged adjacent to the main sound outlet hole 40. The sound guide tube leads the sound waves at the second side wall 14 to the side of the main sound outlet hole 40 through the second sound wave lead-in portion 32.

[0052] The speaker module of this embodiment can avoid standing wave interference inside the front sound cavity to the greatest extent by adding a sound guide tube structure to guide the sound waves out of the second side wall, reduce the fluctuation amplitude of the frequency response curve of the speaker module in the mid- and high-frequency bands, and improve the acoustic performance of the speaker module.

[0053] Fig.10 The graph showing the loudness of a speaker as a function of frequency is shown in Fig.10 It can be seen that in the mid-high frequency range, the fluctuation amplitude of the speaker module does not exceed 60dB. Fig. 9The related technology shown in the figure has a fluctuation amplitude of more than 70dB within this frequency band. The speaker module of the embodiment of the present application effectively reduces the fluctuation amplitude of the speaker module in the mid- and high-frequency bands, and improves the sound effect of the speaker module.

[0054] Among them, the embodiment of the present application regarding the setting of the secondary sound outlet 30 near the main sound outlet 40 can be understood as: the secondary sound outlet and the main sound outlet are the same sound wave radiation port, or different sound wave radiation ports. When they are different sound wave radiation ports, the distance between the secondary sound outlet and the main sound outlet does not exceed the preset distance value, and the preset distance value can be set according to experience, or according to statistical experiments. For example, the statistical experiment is for the position of the main sound outlet of each type of speaker module, and the secondary sound outlets are respectively set at the openable positions around the plane where the main sound outlet is located. The openable position where the acoustic effect can be improved is determined through simulation experiments, and the secondary sound outlet is set at the openable position. The acoustic effect here can refer to the loudness of the radiated sound wave. Of course, in actual applications, those skilled in the art can choose a reasonable position to set the position of the secondary sound outlet under the enlightenment of this application, so as to improve the acoustic effect of the speaker module through the sound waves radiated by the secondary sound outlet.

[0055] Therefore, in some embodiments of the present application, the secondary sound outlet 30 and the main sound outlet 40 are different sound wave radiation ports, and the distance between the secondary sound outlet 30 and the main sound outlet 40 is less than the preset distance value. As mentioned above, the preset distance value can be set based on experience or statistical experiments. The preset distance value is used to ensure that the secondary sound outlet can also use the near-ear external sound technology to radiate sound waves. That is, the secondary sound outlet is also located near the human ear when the speaker module is worn, so that the sound waves radiated by the main sound outlet and the secondary sound outlet can be received by the human ear in the near field, ensuring the loudness and privacy of the sound waves received by the human ear.

[0056] As Figure 2 and Figure 3 Taking the speaker module shown as an example, the secondary sound outlet 30 and the main sound outlet 40 appear as different sound outlets in the appearance of the module shell. The main sound outlet 40 connects the front sound cavity 50 with the outside world. The first sound wave lead-out portion 42 of the main sound tube 41 is provided on the first side wall 13 of the front sound cavity 50, and most of the sound waves in the front sound cavity are led out to the outside world through the main sound outlet 40. The second sound wave lead-out portion 32 is provided on the second side wall 14 of the front sound cavity 50, and the sound waves at the second side wall 14 of the front sound cavity 50 are led out to the outside world through the secondary sound outlet 30. Since the second sound wave lead-out portion 32 leads out the sound waves at the second side wall 14, no reflected sound waves will be formed at the second side wall 14, so that the standing wave interference can be weakened or even completely eliminated. Here, the sound waves led out of the sound guide tube have the same acoustic phase as the sound waves led out of the main sound outlet 40, so as to improve the loudness of the near-field sound waves of the speaker module.

[0057] Specifically, the main sound outlet 40 is provided on the first surface 15 of the upper shell 11 of the module, and the other port 43 of the main sound pipe 41 is connected to the main sound outlet 40 on the first surface 15. The auxiliary sound outlet 30 is provided on the second surface 16 of the upper shell 11 of the module, and the main body port 33 of the sound pipe main body 31 (the sound pipe main body 31 will be described in detail in the subsequent embodiments) is connected to the auxiliary sound outlet 30 on the second surface 16. A part of the sound waves of the front sound cavity 50 is radiated to the outside through the main sound outlet 40, and the other part of the sound waves is radiated to the outside through the auxiliary sound outlet 30. The two parts of the sound waves meet outside the speaker module and are received by the near-field human ear.

[0058] in Figure 2 and Figure 3 In the example, the first surface 15 and the second surface 16 are adjacent different surfaces. In an optional solution, the first surface 15 and the second surface 16 can also be the same surface, and the auxiliary sound outlet 30 and the main sound outlet 40 are arranged at different positions on the same surface. Alternatively, the auxiliary sound outlet 30 can also be arranged as follows Figure 2 The position where the first surface 15 and the second surface 16 are connected, that is, the auxiliary sound outlet 30 is located on the first surface 15 and the second surface 16 , and the appearance thereof is approximately an L-shaped structure.

[0059] In other embodiments of the present application, the secondary sound outlet 30 and the primary sound outlet 40 are the same sound wave radiation port, and the secondary sound outlet 30 and the primary sound outlet 40 export sound waves from opposite sides of the front sound cavity 50 and radiate sound waves from the same port.

[0060] As Figure 4 , Figure 5 and Figure 6 Taking the speaker module shown as an example, the secondary sound outlet 30 and the main sound outlet 40 appear as the same sound outlet in the appearance of the module shell. The main sound outlet 40 connects the front sound cavity 50 with the outside world. The first sound wave lead-out portion 42 of the main sound tube 41 is provided on the first side wall 13 of the front sound cavity 50, and most of the sound waves in the front sound cavity are led out to the outside world through the main sound outlet 40. The second sound wave lead-out portion 32 is provided on the second side wall 14 of the front sound cavity 50, and the sound waves at the second side wall 14 of the front sound cavity 50 are led out to the outside world through the secondary sound outlet 30. Since the second sound wave lead-out portion 32 leads out the sound waves at the second side wall 14, no reflected sound waves will be formed at the second side wall 14, and the standing wave interference in the front sound cavity 50 can be weakened or even completely eliminated.

[0061] Specifically, the main sound outlet 40 is provided on the upper shell 11 of the module. The main sound outlet 40 is, for example, an approximately L-shaped structure. The other port 43 of the main sound pipe 41 is connected to the first end of the approximately L-shaped structure. The main body port 33 of the sound pipe main body 31 is connected to the second end of the approximately L-shaped structure. The second end and the first end are different ends of the main sound outlet 40 of the approximately L-shaped structure. The two parts of the sound waves derived from the main sound pipe 41 and the sound pipe main body 31 meet at the main sound outlet 40, and the sound waves are radiated out by the main sound outlet 40. Of course, in actual applications, the main sound outlet 40 can be other shapes, and the connection positions of the main sound pipe, the sound pipe and the main sound outlet 40 can be flexibly selected, and this embodiment does not specifically limit this. Here, the two parts of the sound waves that meet at the main sound outlet 40 have the same acoustic phase to improve the loudness of the speaker module.

[0062] The above-mentioned embodiments of the present application exemplify the shape, position, etc. of the sound outlet hole and the corresponding sound guide tube. In actual applications, those skilled in the art can flexibly set the shape of the main sound outlet hole of the speaker module, the opening position of the main sound outlet hole, the sound guide tube of the main sound outlet hole, the shape of the auxiliary sound outlet hole, the opening position of the auxiliary sound outlet hole, the sound guide tube of the auxiliary sound outlet hole, the sound wave lead-out part, etc. The exemplary schemes shown in the above-mentioned embodiments of the present application should not be regarded as limiting schemes.

[0063] In practical applications, the rectangular structure and the runway structure of the speaker monomer are relatively common monomer structures, wherein the runway structure can be understood as a regular structure consisting of two relatively straight sides and two relatively arc-shaped sides. For these two monomer structures, the opening positions of the second sound wave lead-out portion 32 are respectively described through the following embodiments.

[0064] In some embodiments of the present application, the speaker unit 20 is, for example, a rectangular structure, the main sound outlet 40 is located on the first short axis side of the rectangular structure, and the second sound wave outlet 32 ​​is located on the second short axis side of the rectangular structure, for example, Figure 2 or Figure 6 The edge position of the second side wall 14 on the second short axis side shown in the figure can also be located at a non-edge position of the second side wall 14. Or the second sound wave lead-out portion 32 is located at the position where the second short axis side and the long axis side of the rectangular structure meet, for example Figure 7 The position where the second short axis side and the long axis side meet on the second side wall is shown in FIG.

[0065] In some other embodiments of the present application, the speaker unit 20 is, for example, a runway-shaped structure, wherein the straight side of the runway-shaped structure is the long axis side of the speaker unit, and the arc side is the short axis side of the speaker unit. The main sound outlet 40 is located on the first short axis side, and the second sound wave lead-out portion 32 is located on the second short axis side.

[0066] It should be noted that, for other types of speaker units, those skilled in the art can, inspired by the embodiments of the present application, reasonably set the opening position of the second sound wave lead-out portion to guide the reflected sound waves formed by the side wall of the front sound cavity to the outside, thereby avoiding standing wave interference in the front sound cavity.

[0067] In some embodiments of the present application, the sound guide tube further includes a connecting portion 34 located between the second sound wave outlet portion 32 and the auxiliary sound outlet hole 30, wherein the size of the cross section of the second sound wave outlet portion 32 is different from the size of the cross section of the connecting portion 34, specifically, the size of the cross section of the second sound wave outlet portion 32 is smaller than or larger than the size of the cross section of the connecting portion 34. Of course, the size of the cross section of the second sound wave outlet portion 32 may be the same as the size of the cross section of the connecting portion 34, and those skilled in the art may reasonably set it.

[0068] In some optional embodiments of the present application, the sound guide tube further includes a sound guide tube body 31 located between the connecting portion 34 and the auxiliary sound outlet 30, and the cross-sectional dimensions of the second sound wave lead-out portion 32, the connecting portion 34 and the sound guide tube body 31 are different from each other.

[0069] like Figure 7 As shown, the sound guide tube is a guiding component which is connected in sequence by a second sound wave lead-out part 32, a connecting part 34, a sound guide tube main body 31 and a secondary sound outlet hole 30, wherein the opening of the second sound wave lead-out part 32 is arranged at a position where the second short axis side and the long axis side of the rectangular structure are connected, the second sound wave lead-out part 32 is a narrow-mouth structure, the connecting part 34 is a narrow-mouth structure, and the sound guide tube main body 31 is a wide-mouth structure. The combination of the narrow-mouth structure and the wide-mouth structure can enhance the loudness of the sound waves radiated by the sound guide tube 31 and improve the near-field sound wave performance of the speaker module.

[0070] It should be noted that Figure 7It is exemplified that the cross-sectional dimensions of the second sound wave lead-out portion 32, the connecting portion 34 and the sound guide tube main body 31 are different from each other, and the cross-sectional dimensions increase successively. In practical applications, those skilled in the art should set the cross-sectional dimensions of the second sound wave lead-out portion 32, the connecting portion 34 and the sound guide tube main body 31 according to the specific structure of the speaker module, for example, setting the cross-sectional dimension of the second sound wave lead-out portion 32 to be smaller than the cross-sectional dimension of the sound guide tube main body 31. The setting condition is to ensure that the sound wave derived from the sound guide tube has the same acoustic phase as the sound wave derived from the main sound outlet in the full frequency band or most of the frequency band, and can minimize the energy loss of the reflected sound wave, so as to improve the near-field sound wave loudness of the speaker module through the sound wave radiated from the auxiliary sound outlet. The sound guide tube main body 31 in the embodiment of the present application can be a structure with a gradual change in the cross-sectional dimension from the connecting portion 34 to the auxiliary sound outlet 30. For example, along the direction of sound wave radiation, the cross-sectional dimension of the connecting portion 34 gradually increases or gradually decreases. The gradient mode here is, for example, uniform gradient or uneven gradient. Optionally, the cross sections of the sound guide tube body 31 at different positions may also be the same, for example, a pipe formed by combining multiple sections with the same caliber, or an integrated pipe with the same caliber.

[0071] Regarding the shape and length of the sound guide tube in the embodiment of the present application, those skilled in the art may conduct acoustic simulation experiments on the condition of improving the acoustic effect of the speaker module to determine a reasonable shape and length. Optionally, the length L of the sound guide tube has a numerical range of 0.8mm≤L≤120mm.

[0072] Regarding the position of the sound guide tube in the embodiment of the present application, it can be located in the physical space on the upper side of the diaphragm in the speaker module, for example, in the space on the upper side of the diaphragm, or it can occupy the physical space on the upper and lower sides of the diaphragm in the speaker module, for example Figure 8 The second sound wave lead-out portion 32 shown in the figure is led out from the space on the upper side of the diaphragm 21, and the sound guide tube main body 31 is located in the space on the lower side of the diaphragm. At this time, it should be noted that the sound guide tube main body 31 and the sound leakage hole of the rear sound cavity are independent of each other to avoid affecting the sound waves of the rear sound cavity.

[0073] The number of sound guide tubes in the embodiment of the present application can be one or more. When the speaker module includes multiple sound guide tubes, the second sound wave lead-out portions 32 of the multiple sound guide tubes are located at different positions of the second side wall 14, for example, respectively at the two ends on the second short axis side of the second side wall 14.

[0074] It should be understood that the embodiments of the present application can use the idle space of the module cavity to set a sound guide tube without changing the original layout of the internal components of the speaker module, and guide the sound waves at the second side wall 14 to the outside through the sound guide tube, thereby weakening or completely eliminating the standing wave interference of the front sound cavity, and receiving the sound waves together with the sound waves guided by the main sound hole 40 in the near field, thereby improving the acoustic performance of the speaker module. The embodiments of the present application can also reasonably layout the various components during the design stage of the speaker module, and by setting a reasonable second sound wave lead-out part 32 and a sound guide tube 31, weaken or completely eliminate the standing wave interference of the front sound cavity, thereby improving the acoustic performance of the speaker module.

[0075] According to the smart wearable device of the second aspect embodiment of the present application, the smart wearable device of this embodiment includes the speaker module according to the above embodiment of the present application.

[0076] The smart wearable device of this embodiment includes a portable head-mounted device, such as smart glasses, headphones, HMD (Head-Mounted Display) devices, etc. The smart wearable device can be an AR (Augmented Reality), VR (Virtual Reality), MR (Mix Reality) device.

[0077] At least one speaker module is provided in the smart wearable device in this embodiment. For example, in smart glasses, a speaker module may be provided at each temple. The number of speaker modules may be flexibly set by those skilled in the art.

[0078] In some embodiments of the present application, the speaker module can be used as a peripheral component of the smart wearable device. For example, the speaker module can be detachably installed in the smart wearable device.

[0079] Of course, the speaker module can also be assembled in the shell of the smart wearable device. Specifically, the smart wearable device includes a device frame, and the module shell of the speaker module can be at least a part of the device frame. For example, when the module shell of the speaker module with the main sound outlet and the auxiliary sound outlet is a part of the device frame, the main sound outlet and the auxiliary sound outlet of the speaker module are the sound outlets of the smart wearable device. For another example, when the module shell of the speaker module with the main sound outlet and the auxiliary sound outlet is not a part of the device frame, corresponding sound outlets need to be opened on the device frame to connect with the various sound outlets of the speaker module.

[0080] It should be noted that, in some embodiments of the present application, the smart wearable device includes a complete housing, and at least part of the module housing is the complete housing.

[0081] For example, the module housing of the speaker module can be the complete housing of the smart wearable device. For example, during the assembly or use stage of the smart wearable device, the speaker module is directly placed on the smart wearable device. At this time, the module housing where the main / auxiliary sound outlets of the speaker module are located is the complete housing of the smart wearable device. For another example, during the preparation stage of the complete housing of the smart wearable device, the module housing of the speaker module is prepared at the same time. During the assembly stage, only the speaker unit needs to be placed on the smart wearable device. Alternatively, part of the housing of the smart wearable device is part of the module housing.

[0082] In summary, the above-mentioned embodiments of the present application, an improved speaker module is provided in the smart wearable device of the present application, and a sound guide tube is newly provided in the improved speaker module, through which the sound waves at the second side wall of the front sound cavity are guided to the vicinity of the main sound outlet, which can weaken or completely eliminate the standing wave interference in the front sound cavity, and at the same time, can also utilize this part of the sound waves to enhance the near-field sound wave loudness of the speaker module, thereby improving the acoustic performance of the speaker module from at least two acoustic indicators, thereby improving the listening effect of the smart wearable device.

[0083] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0084] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A speaker module, comprising a module housing, wherein a speaker unit is contained in the module housing, and the speaker unit divides the module inner cavity into a front sound cavity and a rear sound cavity, wherein: The main sound outlet of the speaker module radiates the sound waves of the front sound cavity to the outside through the first sound wave lead-out portion provided on the first side wall of the front sound cavity, and the distance from the center position of the speaker unit to the second side wall opposite to the main sound outlet is not less than 8.5 mm; The speaker module also includes a sound guide tube, which includes a second sound wave lead-in portion and a secondary sound outlet hole for radiating sound waves, wherein the second sound wave lead-in portion is arranged on the second side wall of the front sound cavity, and the sound guide tube leads the sound waves at the second side wall of the front sound cavity to the side of the main sound outlet hole through the second sound wave lead-in portion.

2. The speaker module according to claim 1, wherein: The auxiliary sound outlet hole and the main sound outlet hole are different sound wave radiation ports, and the distance between the auxiliary sound outlet hole and the main sound outlet hole is less than a preset distance value.

3. The speaker module according to claim 1, wherein: The auxiliary sound outlet and the main sound outlet are the same sound wave radiation port, and the auxiliary sound outlet and the main sound outlet lead out sound waves from opposite sides of the front sound cavity and radiate sound waves from the same port.

4. The speaker module according to claim 2 or 3, characterized in that: The acoustic phase of the sound wave derived from the sound guide tube is the same as that of the sound wave derived from the main sound outlet hole.

5. The speaker module according to claim 1, wherein: The speaker unit is a rectangular structure, and the first sound wave lead-out portion is located on the first short axis side of the rectangular structure; The second sound wave lead-in portion is located at the second short axis side of the rectangular structure, or the second sound wave lead-in portion is located at a position where the second short axis side and the long axis side of the rectangular structure are connected.

6. The speaker module according to claim 1, wherein: The speaker unit is a runway-shaped structure, the straight side of the runway-shaped structure is the long axis side of the speaker unit, and the arc side is the short axis side of the speaker unit; the first sound wave lead-out portion is located on the first short axis side, and the second sound wave lead-out portion is located on the second short axis side.

7. The speaker module according to claim 1, wherein: The sound guide tube further includes a connecting portion located between the second sound wave lead-out portion and the auxiliary sound outlet hole, wherein the size of the cross section of the second sound wave lead-out portion is different from the size of the cross section of the connecting portion.

8. The speaker module according to claim 7, wherein: The sound guide tube further includes a sound guide tube main body located between the connecting portion and the auxiliary sound outlet hole, and the second sound wave lead-out portion, the connecting portion and the sound guide tube main body have different cross-sectional dimensions.

9. The speaker module according to claim 8, characterized in that: The main body of the sound guide tube is a structure with a cross-sectional size gradually changing from the connecting portion to the auxiliary sound outlet.

10. The speaker module according to claim 8, wherein: The cross sections of the sound guide tube body at different positions are the same, and the sound guide tube body is specifically a tube formed by combining multiple sections with the same caliber, or an integrated tube with the same caliber.

11. The speaker module according to claim 1, wherein: The sound guide tube is located in the physical space above the diaphragm in the speaker module; Alternatively, the sound guide tube occupies the physical space on the upper and lower sides of the diaphragm in the speaker module, and the sound guide tube is independent of the sound leakage hole of the rear sound cavity.

12. The speaker module according to claim 1, wherein: A plurality of the sound guide tubes are included, and the second sound wave lead-out portions of the plurality of the sound guide tubes are located at different positions of the second side wall.

13. The speaker module according to claim 1, wherein: At least part of the module housing is the entire housing of the smart wearable device.

14. The speaker module according to claim 1, wherein: The length L of the sound guide tube has a numerical range of 0.8 mm ≤ L ≤ 120 mm.

15. A smart wearable device, characterized in that: include: A device frame, wherein at least one speaker module is installed in the device frame, and the speaker module is the speaker module according to any one of claims 1-14.

16. The smart wearable device according to claim 15, characterized in that: The smart wearable device includes a whole device housing, and at least a portion of the module housing is the whole device housing.

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