Speaker module and wearable device

Abstract

The present invention discloses a speaker module and a wearable device, wherein the speaker module is suitable for being configured on the wearable device. The speaker module includes at least one driving unit and a shell. The driving unit is used to generate sound. The shell accommodates the driving unit and has a front chamber and a rear chamber. The front chamber and the rear chamber are respectively located on opposite sides of the driving unit. The shell has a front opening, a first rear opening and a second rear opening. The front opening is connected to the front chamber. The first rear opening and the second rear opening are respectively connected to the rear chamber. The sum of the sounds output by the front opening, the first rear opening and the second rear opening has directivity. The directivity can reduce the deviation caused by the wearing variation of the user and the structural difference of the human body. In addition, the directivity can isolate the voice, making it difficult for the outside to hear the voice content output by the speaker module, creating a more private use scenario, and allowing the user to have a more realistic listening experience and a more comfortable use experience.

Description

Technical Field

[0001] The present invention relates to a speaker module, and in particular to a speaker module suitable for being configured on a wearable device. Background Art

[0002] At present, the main way to listen to the sound of wearable devices is through headphones or miniature speakers. Due to factors such as each person's preferences and body structure, the position of wearing wearable devices varies. However, current speakers cannot better help with the variability of wearing. Whether it is in-ear or earmuff headphones, when wearing headphones, you will feel insecure and isolated from the outside world, and because the headphones are attached to the ears, wearing them for a long time will cause discomfort. On the other hand, when the headphone sound-generating elements are attached to the left and right ears, in order to achieve the 3D surround effect, many spatial effects must be simulated. However, every time the sound reaches the ear, the user cannot distinguish the source of the sound because the sound transmission has no directionality. In addition, the effect of wearing headphones may be unstable due to factors such as poor effect caused by non-personalized spatial effects, or differences caused by the wearing position not being the same every time.

[0003] In addition, the mainstream micro speakers on the market currently have smaller driving components for easy integration into the device, which makes it difficult to fully and realistically present the bandwidth, volume and directionality of the sound. The mainstream head mounted display (HMD) is equipped with a pair of speakers or multiple speakers, most of which are traditional closed speaker designs without directional functions, which reduces the sense of reality and lacks the privacy of closed headphones, and there will be obvious interference between the left and right channels. Summary of the invention

[0004] The invention provides a speaker module, the sum of the sounds output by the speaker module has directivity.

[0005] The present invention provides a wearable device, the sum of the sounds output by the speaker module of the wearable device has directivity.

[0006] The speaker module of the present invention is suitable for being configured on a wearable device, and the speaker module includes at least one driving unit and a shell. The driving unit is used to generate sound. The shell accommodates the driving unit and has a front chamber and a rear chamber, wherein the front chamber and the rear chamber are respectively located on opposite sides of the driving unit. The shell has a front opening, a first rear opening and a second rear opening. The front opening is connected to the front chamber. The first rear opening and the second rear opening are respectively connected to the rear chamber. The sum of the sounds output by the front opening, the first rear opening and the second rear opening has directivity.

[0007] The wearable device of the present invention includes a frame and at least one speaker module. The speaker module includes at least one drive unit and a shell. The drive unit is used to generate sound. The shell accommodates the drive unit and has a front chamber and a rear chamber, wherein the front chamber and the rear chamber are respectively located on opposite sides of the drive unit. The shell has a front opening, a first rear opening and a second rear opening. The front opening is connected to the front chamber. The first rear opening and the second rear opening are respectively connected to the rear chamber. And the sum of the sounds output by the front opening, the first rear opening and the second rear opening has directivity.

[0008] A speaker module of the present invention is suitable for being configured on a wearable device. The speaker module includes two drive units and a shell. The two drive units are used to generate sound. The shell accommodates the two drive units and has a front chamber and a rear chamber, wherein the front chamber and the rear chamber are respectively located on opposite sides of the two drive units. The shell has a front opening, a first rear opening and a second rear opening. The front opening is connected to the front chamber. The first rear opening and the second rear opening are respectively connected to the rear chamber. The sum of the sounds output by the front opening, the first rear opening and the second rear opening has directivity. The shell also includes a front cover, a rear cover and a partition plate. The partition plate is located between the front cover and the rear cover, wherein the partition plate and the front cover constitute the front chamber. The partition plate and the rear cover constitute the rear chamber. The partition plate has two slots. The two drive units are respectively arranged in the two slots.

[0009] Based on the above, in the present invention, the sum of the sounds output by the speaker module has directivity, which can reduce the deviation caused by the wearing variation of the user and the structural difference of the human body. In addition, the directivity can isolate the voice, making it difficult for the outside to hear the voice content output by the speaker module, creating a more private use scenario, and allowing the user to have a more realistic listening experience and a more comfortable use experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The accompanying drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the present invention and together with the description serve to explain the principles of the present invention.

[0011] Figure 1A is an exploded view of a speaker module according to an embodiment of the present invention;

[0012] Figure 1B yes Figure 1A A cross-sectional view of a speaker module;

[0013] Figure 2 yes Figure 1A A cross-sectional view of a speaker module;

[0014] Figure 3A yes Figure 1A A front view of the speaker module after assembly;

[0015] Figure 3B is a front view of a speaker module according to another embodiment of the present invention;

[0016] Figure 4A yes Figure 2 A schematic diagram of the angle range between the direction of the total sound of the speaker module and the listening angle;

[0017] Figure 4B yes Figure 4A Schematic diagram of the sound pressure field generated by the loudspeaker module;

[0018] Figure 5A is a schematic diagram of a wearable device according to an embodiment of the present invention;

[0019] Figure 5B yes Figure 5A A schematic top view of a wearable device;

[0020] Figure 5C yes Figure 5A A partial enlarged view of the wearable device;

[0021] Figure 5D is a schematic diagram of a wearable device according to another embodiment of the present invention;

[0022] Figure 5E is a schematic diagram of a wearable device according to another embodiment of the present invention;

[0023] Fig. 6A is a schematic diagram of a wearable device having a related speaker module outputting sound;

[0024] Figure 6B yes Figure 5A Schematic diagram of sound output by a wearable device;

[0025] Fig. 7A It is the sound field distribution when the relevant speaker module outputs sound;

[0026] Figure 7B yes Figure 1A The sound field distribution when the speaker module outputs sound;

[0027] Figure 7C yes Figure 1A A schematic diagram of a speaker module at a horizontal plane at a user's ear height;

[0028] Fig.7D yes Figure 7C Sound field distribution diagram on the reference surface;

[0029] Fig. 8A is a schematic diagram of the sound field coverage of a wearable device with a related speaker module;

[0030] Figure 8B yes Figure 5A Schematic diagram of the sound field coverage of the wearable device;

[0031] Fig.9A is a cross-sectional view of a related speaker module;

[0032] Fig. 9B yes Fig.9A The sound pressure level diagram obtained by the speaker module;

[0033] Fig. 10A yes Figure 1A A cross-sectional view of a speaker module;

[0034] Fig. 10B yes Fig. 10A The sound pressure level diagram obtained by the speaker module;

[0035] Fig.11A is a cross-sectional view of a speaker module according to another embodiment of the present invention;

[0036] Fig. 11B yes Fig.11A The sound pressure level diagram obtained by the speaker module;

[0037] FIG. 12A to FIG. 12C FIG. 4 is a schematic diagram of a speaker module and the direction of the total sound thereof according to another embodiment of the present invention.

[0038] Description of Figure Numbers

[0039] 10, 20, 30, 40: wearable devices;

[0040] 11, 21, 31, 41: framework;

[0041] 12, 32: display unit;

[0042] 100, 200, 300, 400, 500: speaker module;

[0043] 110, 310, 410, 510: housing;

[0044] 110a, 310a, 510a, 510b: front opening;

[0045] 110b, 210b, 310b: first rear opening;

[0046] 110c, 310c: second rear opening;

[0047] 111, 411, 511: front cover;

[0048] 111a, 112a: inner surface;

[0049] 111b: convex surface;

[0050] 112, 512: back cover;

[0051] 113: separator;

[0052] 113a: slot;

[0053] 114, 514: front chamber;

[0054] 115, 515: rear chamber;

[0055] 120, 420, 520: drive unit;

[0056] 121: front;

[0057] 122: back;

[0058] 123: bearing surface;

[0059] 210b1: Second opening;

[0060] 510c, 510d, 510e: rear opening;

[0061] A: axis;

[0062] a, a1, a2, a3: reverse vector;

[0063] a', a1', a2', a3'N: normal vector;

[0064] b1: first vector;

[0065] b2: second vector;

[0066] b51, b52, b53, b54, b55, b56: vector;

[0067] CL: Connection line;

[0068] C1: first centroid;

[0069] C2: second centroid;

[0070] C3: third centroid;

[0071] D, D3: direction;

[0072] D1: first direction;

[0073] D2: second direction;

[0074] L1, L2: length;

[0075] W1, W2: width;

[0076] H: interval;

[0077] R1, R2: forward sound wave;

[0078] R3: reverse sound wave;

[0079] S1: first inclined surface;

[0080] S2: second slope. DETAILED DESCRIPTION

[0081] Reference will now be made in detail to exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals are used in the drawings and the description to refer to the same or like parts.

[0082] Please refer to Figure 1A as well as Figure 1B In this embodiment, the speaker module 100 has a housing 110 and at least one driving unit 120. The driving unit 120 is disposed in the housing 110. The housing 110 has a front cover 111, a rear cover 112, and a partition plate 113 disposed between the front cover 111 and the rear cover 112. The partition plate 113 has at least one slot 113a. The partition plate 113 and the front cover 111 constitute a front chamber 114. The partition plate 113 and the rear cover 112 constitute a rear chamber 115. In this embodiment, the number of driving units 120 and the number of slots 113a are both two. In other embodiments, the number of driving units and slots may also be one or more than three, as long as the number of slots is the same as the number of driving units, but is not limited thereto.

[0083] As described above, the housing 110 further has a front opening 110a, a first rear opening 110b and a second rear opening 110c. The front opening 110a is connected to the front chamber 114, and the first rear opening 110b and the second rear opening 110c are respectively connected to the rear chamber 115. The drive unit 120 has a front 121 and a back 122 opposite to each other. The front 121 faces the front cover 111. The back 122 faces the back cover 112. The sound waves transmitted from the front 121 are output from the front opening 110a. The sound waves transmitted from the back 122 are output from the first rear opening 110b and the second rear opening 110c. In other words, the drive unit 120 is arranged between the front chamber 114 and the rear chamber 115, and the front chamber 114 and the rear chamber 115 are not connected to each other.

[0084] Please refer to Figure 2, the direction D of the sum of the sounds of the speaker module 100 is formed by the vector formed by the front opening 110a, the first rear opening 110b and the second rear opening 110c. In detail, the line between the front opening 110a and the first rear opening 110b forms a first vector b1 pointing to the front opening 110a. The line between the front opening 110a and the second rear opening 110c forms a second vector b2 pointing to the front opening 110a. The line between the first rear opening 110b and the second rear opening 110c forms a third vector pointing to the second rear opening 110c, wherein the third vector has a normal vector a' away from the driving unit 120. The normal vector a' has a reverse vector a pointing to the driving unit 120. The first vector b1, the second vector b2 and the reverse vector a are added to form the direction D of the sum of the sounds. When the sizes of the front opening 110a, the first rear opening 110b and the second rear opening 110c are the same, the direction D of the sum of the sounds is D=a+b1+b2. When the sizes of the front opening 110a, the first rear opening 110b and the second rear opening 110c are different, they are appropriately weighted. At this time, the direction D of the total sound is D=w1a+w2b1+w3b2, where w1, w2 and w3 are weighting coefficients.

[0085] For example, the vector may also be formed by the centroids of each opening. The plane surrounded by the front opening 110a has a first centroid C1. The plane surrounded by the first rear opening 110b has a second centroid C2. The plane surrounded by the second rear opening 110c has a third centroid C3. The first centroid C1 and the second centroid C2 form a first vector b1 in the direction of the first centroid C1. The first centroid C1 and the third centroid C3 form a second vector b2 in the direction of the first centroid C1. The second centroid C2 and the third centroid C3 form a third vector in the direction of the third centroid C3. The third vector has a normal vector a' away from the first centroid C1. The normal vector a' has a reverse vector a pointing to the first centroid C1. The first vector b1, the second vector b2 and the reverse vector a are unit vectors. The first vector b1, the second vector b2 and the reverse vector a are added to form the direction D of the sum of the sounds.

[0086] Please refer to FIG. 12A to FIG. 12C , the speaker module 500 is substantially the same as the speaker module 100. The difference between the two is that the number of front openings and the number of rear openings of the speaker module 500 are different from those of the speaker module 100. In this embodiment, the housing 510 of the speaker module 500 has two front openings 510a, 510b and three rear openings 510c, 510d, 510e. The front cover 511 and the drive unit 520 form a front chamber 514, and the rear cover 512 and the drive unit 520 form a rear chamber 515. The two front openings 510a, 510b are respectively connected to the front chamber 514. The three rear openings 510c, 510d, 510e are respectively connected to the rear chamber 515.

[0087] In detail, the line connecting the front opening 510a and each of the rear openings 510c, 510d, 510e has vectors b51, b52, b53 pointing to the front opening 510a. The line connecting the front opening 510b and each of the rear openings 510c, 510d, 510e has vectors b54, b55, b56 pointing to the front opening 510b. On the other hand, the line connecting any two rear openings has normal vectors a1', a2', a3'. Each normal vector a1', a2', a3' has a reverse vector a1, a2, a3 pointing to the driving unit 520. The vector sum of the vectors b51, b52, b53 and the reverse vectors a1, a2, a3 forms a first direction D1. The vector sum of the vectors b54, b55, b56 and the reverse vectors a1, a2, a3 forms a second direction D2. On the opening line connecting the front opening 510a and the front opening 510b, the first direction D1 and the second direction D2 are added to form a direction D3 of the sum of the sounds. That is, in different numbers of front openings and rear openings, the sum of the sounds still has directionality.

[0088] Please refer to Figure 2 On the other hand, the plane formed by the front opening 110a has a normal vector N away from the driving unit 120. The normal vector N is perpendicular to the plane formed by the front opening 110a. The driving unit 120 has an axis A perpendicular to the front face 121. The axis A and the normal vector N form a geometric plane. On the geometric plane, the angle between the axis A and the normal vector N is less than 90 degrees. That is, the plane formed by the front opening 110a and the axis A are not perpendicular to each other, and the front opening 110a and the front face 121 are not parallel to each other.

[0089] Please refer to Figure 3A In this embodiment, the first rear opening 110b is a single opening. Figure 3B In another embodiment, the speaker module 200 and Figure 3A The speaker module 100 is substantially the same as the speaker module 100. The difference between the two is that the first rear opening 210b of the speaker module 200 includes two secondary openings 210b1. In the present invention, each opening has an effective length. When there is no gap between the openings, the effective length is the length of the opening plus twice the width of the opening. When there is a gap between the openings, but the gap is less than half the length of the smallest opening on the two adjacent sides or less than the width of the opening, the structural gap can be ignored when calculating the effective length. Figure 3B In the embodiment of FIG. 1 , since the interval H between the two secondary openings 210b1 is less than half of the length L2 of the smallest opening on the two adjacent sides, the interval H between the two secondary openings 210b1 can be ignored. In other words, Figure 3A The length L1 of the first rear opening 110b is Figure 3BThe length L2 of the first rear opening 210b is the same as that of the first rear opening 110b, and the width W1 of the first rear opening 110b is the same as that of the first rear opening 210b. Figure 3A The effective length of the first rear opening 110b is Figure 3B The effective length of the first rear opening 210b is the same as that of Figure 3A The first rear opening 210b may be changed to Figure 3B The configuration of the secondary opening of the first rear opening 210b and the setting of the effective length, Figure 3A The front opening 110a and the second rear opening 110c may also have similar sub-opening configurations and effective length settings.

[0090] Based on the above, Figure 3B In the embodiment, the effective lengths of the front opening 110a, the first rear opening 110b, and the second rear opening 110c of the speaker module 100 are substantially the same. In detail, the direction D of the sum of the sounds of the speaker module 100 is related to the size and shape of the openings. When the size or shape of the front opening 110a, the first rear opening 110b, and the second rear opening 113a are different, the opening with the smallest effective length can be used as the main one, and the direction D of the sum of the sounds of the speaker module 100 can be derived from this.

[0091] Please refer to Figure 4A and Figure 4B , there is a line CL between the front opening 110a (e.g., the first centroid C1 of the front opening 110a) and the ear reference point (ERP) of the human body. The direction D of the total sound output by the speaker module 100 is within plus or minus 30 degrees of the line CL. In other words, the listening range of the speaker module 100 is reduced, making it difficult for the outside world to hear the sound output by the speaker module 100 clearly.

[0092] Please refer to FIG. 5A to FIG. 5C , the speaker module 100 is suitable for being configured on the wearable device 10. The wearable device 10 includes a head mounted display device (HMD), which may include a frame 11, a display unit 12, and a pair of speaker modules 100 disposed in the frame 11. The front opening 110a, the first rear opening 110b, and the second rear opening 110c are integrated on the frame 11, that is, the housing 110 is formed by a part of the frame 11. In this embodiment, the pair of speaker modules 100 can be respectively disposed on the left and right sides of the frame 11 and close to a pair of ears of the user. The front opening 110a and the first rear opening 110b of each speaker module 100 face the head of the user, and are respectively 45 degrees upward and 45 degrees downward relative to the horizontal plane, which can optimize the direction D of the sum of the sounds.

[0093] Please refer to Figure 5D In another embodiment, the wearable device 20 may include a frame 21 and a speaker module 100. The speaker module 100 is detachably disposed on the frame 21. The wearable device 20 is, for example, an ear-hook device.

[0094] Please refer to Figure 5E In another embodiment, the wearable device 30 may also have more than three speaker modules 100. These speaker modules 100 are assembled on the wearable device 30 with surround speaker placement, and the angle of the speaker module 100 is adjusted to enhance the effect of the surround sound field. In other unillustrated embodiments, according to the set frame form, the wearable device may also be a speaker surround listening device, a head-mounted device, a neck-mounted device, a shoulder-mounted device, a face-mounted device, etc. The number of speaker modules may be one or more, but is not limited thereto.

[0095] Please refer to Fig. 6A Generally speaking, the wearable device 40 has two speaker modules 400, which are arranged on the left and right sides of the frame 41 of the wearable device 40. Since the speaker module 400 has only a single opening, when the left speaker module 400 outputs sound, a forward sound wave R1 is generated and diffused around, and then transmitted to the right ear of the user, causing interference.

[0096] However, please refer to Figure 6B , Figure 5A Each speaker module 100 has a front opening 110a, a first rear opening 110b, and a second rear opening 110c. The front opening 110a and the first rear opening 110b are arranged on the inner side of the wearable device 10 and face the direction of the user's head at a specific angle, so that the sound output by the left speaker module 100 has a forward sound wave R2 and a reverse sound wave R3 in the opposite direction to the forward sound wave R2. The forward sound wave R2 is output from the front opening 110a. The reverse sound wave R3 is output from the first rear opening 110b. When the reverse sound wave R3 and the forward sound wave R2 bypass the user's head and are transmitted to the right ear, because the transmission distance is close and the sound waves still maintain opposite phases, the reverse sound wave R3 and the forward sound wave R2 will cancel each other when they meet at the user's right ear. Reduce the interference caused by the sound output by the left speaker module to the right ear. Similarly, the sound waves from the right speaker module 100 will cancel each other out when transmitted to the left ear, thereby reducing the interference to the left ear caused by the sound output from the right speaker module 100 .

[0097] Please refer to Fig. 6A Since the sum of the sounds output by the related speaker modules 400 is not directional, the sound field distribution of the sounds output by the related speaker modules 400 will diffuse outward with the speaker modules as the center, forming concentric circles with the speaker modules 400 as the center, such as Fig. 7AThat is to say, the sound output by the related speaker module 400 will not be directed to the ear.

[0098] Please refer to Figure 6B Since the sum of the sounds output by the speaker module 100 is directional and is output in the direction of the user's ear reference point, the sound field distribution of the sounds output by the speaker module 100 is cardioid and is directed toward the user's ear, as shown in FIG. Figure 7B , Figure 7C and Fig.7D shown. Figure 7B yes Figure 1A Sound field distribution diagram of the speaker module 100. Figure 7C FIG. 1 is a schematic diagram showing the speaker module 100 at the level of the user's ear.

[0099] Please refer to Fig. 8A and Figure 8B When users wear the wearable device 10, different wearing positions may occur due to different habits. Fig. 8A and Figure 8B The slashed area in the figure is the overlapping area of ​​the sound field at different wearing positions. Fig. 6A The sound output by the related speaker module 400 is not directional, so the overlapping area of ​​the sound field at different wearing positions will not cover the user's ears. This will cause the sound quality to deteriorate. However, due to Figure 6B The sum of the sounds output by the speaker module 100 is directional and points to the user's ears. Even if the wearable device 100 is worn at a different position, the sound field area can still be kept to cover the user's ears as much as possible to maintain the quality of the sound.

[0100] Please refer to Fig.9A Since the inner side of the housing 410 of the related speaker module 400 is a plane and parallel to the front of the driving unit 420, there is no resonance effect. Therefore, the peak of the speaker module 400 in the mid-high frequency is about 3kHz. Fig. 9B shown.

[0101] Please refer to Fig. 10A, the inner surface 111a of the front cover 111 of the speaker module 100 has a convex surface 111b. The convex surface 111b faces the front 121 of the driving unit 120, which can increase the resonance peak of the front chamber 114 and increase the mid-high frequency of the speaker module 100. In detail, the convex surface 111b has a first inclined surface S1 and a second inclined surface S2. The first inclined surface S1 is parallel to the supporting surface 123 of the driving unit 120, and the angle between the first inclined surface S1 and the second inclined surface S2 is 20°. On the other hand, the second rear opening 110c is aligned with the back surface 122 of the driving element 120, and the distance between the inner surface 112a of the rear cover 112 and the driving element 120 is within 1mm, which can increase the peak of the mid-high frequency to above 5kHz. In addition, the angle between the first inclined plane S1 and the second inclined plane S2 may also be greater than 20° or less than 20°. As long as the angle between the first inclined plane S1 and the second inclined plane S2 is between 0° and 45°, the resonance peak value can be increased and the mid-high frequency frequency can be improved.

[0102] Please refer to Fig.11A and Fig. 11B The speaker module 300 is substantially the same as the speaker module 100. The difference between the two is that the housing 310 of the speaker module 300 is different from the housing 110 of the speaker module 100. In this embodiment, the housing 310 of the speaker module 300 is a mesh thin shell, and a mesh with a high opening rate is used on the front opening 310a, the first rear opening 310b, and the second rear opening 310c. Therefore, the directivity of the sum of the sounds output by the speaker module 300 can be maintained, and the resonance peak can be increased to above 8kHz.

[0103] In summary, in the present invention, the sum of the sounds output by the speaker module has directionality, which can reduce the deviation caused by the wearing variation of the user and the structural difference of the human body. In addition, the directionality can isolate the voice, making it difficult for outsiders to hear the voice content output by the speaker module, creating a more private usage scenario, and allowing users to have a more realistic listening experience and a more comfortable usage experience.

Claims

1. A speaker module, suitable for being configured on a wearable device, characterized in that: The speaker module comprises: at least one drive unit for producing sound; and A shell, accommodating the at least one driving unit, and having a front chamber and a rear chamber, wherein the front chamber and the rear chamber are respectively located on opposite sides of the at least one driving unit, the shell having a front opening, a first rear opening and a second rear opening, the front opening is connected to the front chamber, the first rear opening and the second rear opening are respectively connected to the rear chamber, and the sum of the sounds output by the front opening, the first rear opening and the second rear opening has directivity, Wherein the front opening and the first rear opening form a first vector toward the front opening, the front opening and the second rear opening form a second vector toward the front opening, the first rear opening and the second rear opening form a third vector toward the second rear opening, the third vector has a normal vector perpendicular to the third vector, and the first vector, the second vector and the reverse vector of the normal vector are added to form the direction of the sum.

2. The speaker module as claimed in claim 1, wherein the plane formed by the front opening has a first centroid, the plane formed by the first rear opening has a second centroid, the plane formed by the second rear opening has a third centroid, the first centroid is connected to the second centroid and forms a first vector toward the first centroid, the first centroid is connected to the third centroid and forms a second vector toward the first centroid, the second centroid is connected to the third centroid and forms a third vector toward the third centroid, the third vector has a normal vector perpendicular to the third vector, and the first vector, the second vector and the reverse vector of the normal vector are added to form the direction of the sum. 3 . The speaker module as claimed in claim 2 , wherein the first vector, the second vector and the third vector are unit vectors.

4. The speaker module as claimed in claim 1, wherein the shell further has a front cover, a rear cover and a partition plate, the partition plate is arranged between the front cover and the rear cover, the partition plate and the front cover constitute the front chamber, the partition plate and the rear cover constitute the rear chamber, the partition plate has at least one slot, and the at least one drive unit is arranged in the at least one slot.

5. The speaker module as claimed in claim 4, wherein the front cover further has a convex surface, the convex surface faces the at least one driving unit, the convex surface has a first inclined surface and a second inclined surface, the first inclined surface is perpendicular to the axis of the driving unit, and the angle between the first inclined surface and the second inclined surface is 0 degrees to 45 degrees. 6 . The speaker module according to claim 5 , wherein on a geometric plane formed by the axis and a normal vector of the front opening away from the at least one driving unit, an angle between the axis and the normal vector is less than 90 degrees. 7 . The speaker module according to claim 1 , wherein the shell is a mesh thin shell, and the opening ratio of the front opening, the first rear opening and the second rear opening is higher than that of other parts of the shell.

8. A wearable device, characterized in that: include: frame; as well as At least one speaker module, the at least one speaker module comprising: at least one drive unit for producing sound; as well as A shell, accommodating the at least one driving unit, and having a front chamber and a rear chamber, wherein the front chamber and the rear chamber are respectively located on opposite sides of the at least one driving unit, the shell having a front opening, a first rear opening and a second rear opening, the front opening is connected to the front chamber, the first rear opening and the second rear opening are respectively connected to the rear chamber, and the sum of the sounds output by the front opening, the first rear opening and the second rear opening has directivity, Wherein the front opening and the first rear opening form a first vector toward the front opening, the front opening and the second rear opening form a second vector toward the front opening, the first rear opening and the second rear opening form a third vector toward the second rear opening, the third vector has a normal vector perpendicular to the third vector, and the first vector, the second vector and the reverse vector of the normal vector are added to form the direction of the sum.

9. The wearable device of claim 8, wherein the plane formed by the front opening has a first centroid, the plane formed by the first rear opening has a second centroid, the plane formed by the second rear opening has a third centroid, the first centroid is connected to the second centroid and forms a first vector toward the first centroid, the first centroid is connected to the third centroid and forms a second vector toward the first centroid, the second centroid is connected to the third centroid and forms a third vector toward the third centroid, the third vector has a normal vector perpendicular to the third vector, and the first vector, the second vector and the reverse vector of the normal vector are added to form the direction of the sum.

10. The wearable device of claim 9, wherein the first vector, the second vector, and the third vector are unit vectors.

11. The wearable device as claimed in claim 8, wherein the angle between the direction of the sum and a straight line connecting the front opening to the ear reference point is less than 30 degrees.

12. A wearable device as described in claim 8, wherein the shell further has a front cover, a rear cover and a partition plate, the partition plate is arranged between the front cover and the rear cover, the partition plate and the front cover constitute the front chamber, the partition plate and the rear cover constitute the rear chamber, the partition plate has at least one slot, and the at least one driving unit is arranged in the at least one slot.

13. The wearable device as claimed in claim 12, wherein the front cover further has a convex surface, the convex surface faces the at least one driving unit, the convex surface has a first inclined surface and a second inclined surface, the first inclined surface is perpendicular to the axis of the at least one driving unit, and the angle between the first inclined surface and the second inclined surface is 0 degrees to 45 degrees.

14. The wearable device as claimed in claim 13, wherein the angle formed by the axis and the front opening is less than 90 degrees.

15. The wearable device as claimed in claim 8, wherein the shell is a mesh thin shell, and the opening ratio of the front opening, the first rear opening and the second rear opening is higher than that of other parts of the shell.

16. The wearable device of claim 8, further comprising: The display unit is arranged on the frame.

17. The wearable device as claimed in claim 8, wherein the number of the at least one speaker module is two, and the two speaker modules are arranged on the left and right sides of the frame, when the sound emitted by the speaker module on the left is transmitted to the right, it will be offset by the speaker module on the right, and when the sound emitted by the speaker module on the right is transmitted to the left, it will be offset by the speaker module on the left.

18. A speaker module, suitable for being configured on a wearable device, characterized in that: The speaker module comprises: two drive units for producing sound; and A shell, accommodating the two driving units, and having a front chamber and a rear chamber, wherein the front chamber and the rear chamber are respectively located on opposite sides of the two driving units, the shell having a front opening, a first rear opening and a second rear opening, the front opening is connected to the front chamber, the first rear opening and the second rear opening are respectively connected to the rear chamber, and the sum of the sounds output by the front opening, the first rear opening and the second rear opening has directivity, The housing comprises: Front cover; rear cover; and a partition plate, located between the front cover and the rear cover, wherein the partition plate and the front cover constitute the front chamber, and the partition plate and the rear cover constitute the rear chamber, the partition plate has two slots, and the two driving units are respectively arranged in the two slots, Wherein the front opening and the first rear opening form a first vector toward the front opening, the front opening and the second rear opening form a second vector toward the front opening, the first rear opening and the second rear opening form a third vector toward the second rear opening, the third vector has a normal vector perpendicular to the third vector, and the first vector, the second vector and the reverse vector of the normal vector are added to form the direction of the sum.

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