Acoustic device

Abstract

The embodiment of the specification provides an acoustic device, which comprises a sound production part and a suspension structure, in the wearing state, the inner side face of the sound production part shell is provided with sound outlet holes, and other side faces are provided with pressure relief holes. On a reference plane parallel to or tangent to the side face where the effective ventilation port of the pressure relief hole is located, the effective ventilation port of the pressure relief hole is provided with a first projection, and the sound outlet hole is provided with a second projection. The first projection defines a plurality of mutually parallel first feature line segments which are perpendicular to the inner side surface and have two ends located at the outline of the first projection, one end point, farther from the second projection, of two end points of any first feature line segment is a reference point, and the plurality of reference points comprise a first reference point and a second reference point; the distance from any first reference point to the second projection is smaller than the distance from any second reference point to the second projection, the plurality of first feature line segments comprise a first sub-line segment passing through the first reference point and a second sub-line segment passing through the second reference point, and the first length of the first sub-line segment is smaller than the second length of the second sub-line segment.

Description

Technical Field

[0001] The present specification relates to the field of acoustic technology, and in particular to an acoustic device. Background Art

[0002] With the development of acoustic output technology, acoustic devices have been widely used in people's daily lives. They can be used in conjunction with electronic devices such as mobile phones and computers to provide users with an auditory feast. In acoustic devices, sound outlets are generally set to output the sound from the front of the diaphragm, and pressure relief holes are set to output the sound from the back of the diaphragm. The design of the pressure relief holes has a great impact on the output performance of the headphones.

[0003] Therefore, it is necessary to propose an acoustic device, and to improve the output effect of the acoustic device by designing a pressure relief hole. Utility Model Content

[0004] One of the embodiments of the present specification provides an acoustic device, comprising: a sound-emitting portion, comprising a shell and a diaphragm accommodated in the shell, the diaphragm vibrating to generate sound; a suspension structure, configured to wear the sound-emitting portion in a position near the user's ear canal but not blocking the ear canal, wherein, in a worn state, the shell has a sound outlet hole on the inner side surface facing the user's auricle, and the sound outlet hole is configured to guide the sound generated by the front side of the diaphragm out of the shell; the shell has pressure relief holes on other sides except the inner side surface, and the pressure relief holes are configured to guide the sound generated by the rear side of the diaphragm out of the shell; wherein the pressure relief holes include an effective air permeable port, the effective air permeable port has a first projection on a reference plane, and the reference plane is parallel to or Tangent, the reference plane is perpendicular to the inner side surface, the first projection defines a plurality of mutually parallel first characteristic line segments perpendicular to the inner side surface and both ends of which are located at the contour of the first projection, the sound outlet has a second projection on the reference plane, the end point of any first characteristic line segment that is farther from the second projection is the reference point, the plurality of reference points include the first reference point and the second reference point, the distance from any first reference point to the second projection is less than the distance from any second reference point to the second projection, the plurality of first characteristic line segments include the first sub-line segment passing through the first reference point and the second sub-line segment passing through the second reference point, the first sub-line segment has a first length, the second sub-line segment has a second length, and the first length is less than the second length. That is, on the first projection, the larger the size of the part farther from the second projection, the smaller the size of the part closer to the second projection, so that the center of the first projection is as far away from the second projection as possible, while making the first projection have a larger area, so as to avoid acoustic short circuit while ensuring that the pressure relief hole has sufficient air permeability.

[0005] In some embodiments, the projection of the sound-emitting part on the reference plane has a long axis direction, the first projection includes a first side parallel to the long axis direction and a second side opposite to the first side, and the first reference point and the second reference point are both located on the second side. By making the first reference point and the second reference point both located on the second side, it is convenient to limit the distance from the first reference point to the line segment shown by the second projection and the distance from the second reference point to the line segment shown by the second projection, thereby facilitating the demarcation of the first sub-line segment and the second sub-line segment.

[0006] In some embodiments, the angle between the second side and the first side is 0°-60°. The angle between the second side and the first side can reflect the area of ​​the first projection, thereby reflecting the area of ​​the effective air permeability port of the pressure relief hole, thereby affecting the air permeability of the pressure relief hole and the resonant frequency of the cavity connected to the pressure relief hole. By setting the above range, the output performance of the acoustic device can be improved while ensuring that the pressure relief hole has sufficient air permeability.

[0007] In some embodiments, as the distance from the reference point of the first characteristic line segment to the second projection increases, the length of the first characteristic line segment also increases accordingly. That is, the part of the first projection that is farther from the second projection has a larger size, thereby making the centroid of the first projection farther from the second projection, so that the pressure relief hole is farther from the sound outlet hole, avoiding the occurrence of acoustic short circuit.

[0008] In some embodiments, the length of the first characteristic line segment is 0.5 mm-1.6 mm, so that the first projection has a larger area, that is, the effective air permeability port of the pressure relief hole has a larger area, ensuring that the pressure relief hole has sufficient air permeability.

[0009] In some embodiments, the pressure relief hole includes a first pressure relief hole, the first pressure relief hole is located on the upper side of the shell, and the length of the first characteristic line segment corresponding to the first pressure relief hole is 0.5mm-1.6mm to ensure that the first pressure relief hole has sufficient air permeability.

[0010] In some embodiments, the pressure relief hole includes a second pressure relief hole, the second pressure relief hole is located on the lower side of the shell, and the length of the first characteristic line segment corresponding to the second pressure relief hole is 1mm-1.6mm to ensure that the second pressure relief hole has sufficient air permeability.

[0011] In some embodiments, the shell includes a connecting end connected to the suspension structure and a free end facing away from the connecting end. Compared with the connecting end, the sound outlet is arranged closer to the free end, so that when worn, the sound outlet is closer to the user's external auditory canal, so that the sound output from the front side of the diaphragm of the sound-emitting part can be better transmitted to the user's ear canal, thereby improving the user's listening volume.

[0012] In some embodiments, the projection of the sound-emitting portion on the reference plane has a long axis direction, and in the long axis direction, the first reference point is closer to the center of the projection of the free end on the reference plane than the second reference point. That is, the end of the projection of the first projection closer to the free end is smaller in size, and the end of the projection farther from the free end is larger in size; correspondingly, the effective air permeable port of the pressure relief hole is narrower in size near the free end, and wider in size far from the free end. Since the sound outlet hole is closer to the free end relative to the connecting end, the effective air permeable port of the pressure relief hole is farther away from the sound outlet hole, while ensuring that the pressure relief hole has sufficient air permeability.

[0013] In some embodiments, the projection of the sound-emitting part on the reference plane has a long axis direction, in which the first projection has two endpoints that are farthest apart, and the line segment in the first characteristic line segment that passes through the midpoint of the two endpoints divides the first projection into two parts, wherein the area enclosed by the part close to the second projection has a first area, and the area enclosed by the other part far from the second projection has a second area, and the first area is smaller than the second area. Thus, the size of the part of the first projection that is closer to the second projection is smaller, and the size of the part of the first projection that is farther from the second projection is larger. In other words, the effective air permeability port of the pressure relief hole is narrower near the sound outlet hole, and wider away from the sound outlet hole, thereby making the effective air permeability port of the pressure relief hole as far away from the sound outlet as possible while ensuring that the pressure relief hole has sufficient air permeability.

[0014] In some embodiments, the projection of the sound-emitting part on the reference plane has a long axis direction. In the long axis direction, the first projection has two endpoints that are farthest apart, and the distance between the two endpoints is 4mm-6mm, so that the size of the first projection and the size of the pressure relief hole are appropriate, thereby improving the output performance and wearing comfort of the acoustic device.

[0015] The embodiments of the present specification also provide an acoustic device, including: a sound-emitting part, including a shell and a diaphragm accommodated in the shell, the diaphragm vibrates to produce sound; a suspension structure, configured to wear the sound-emitting part in a position near the user's ear canal but not blocking the ear canal, wherein, in the wearing state, the shell has a sound outlet hole on the inner side surface facing the user's auricle, and the sound outlet hole is configured to guide the sound generated by the front side of the diaphragm out of the shell; the shell has pressure relief holes on other sides except the inner side surface, and the pressure relief holes are configured to guide the sound generated by the rear side of the diaphragm out of the shell; wherein the pressure relief holes include an effective air permeable port, the effective air permeable port has a first projection on a reference plane, and the reference plane is parallel or tangent to the side where the effective air permeable port is located. , the first projection defines a plurality of second characteristic line segments which are perpendicular to the inner side surface and parallel to each other and whose two ends are both located on the contour of the first projection. The sound outlet has a second projection on the reference plane. The end point of any second characteristic line segment which is closer to the center of the second projection is another reference point. The other reference points include a third reference point and a fourth reference point. The distance from any third reference point to the center of the second projection is less than the distance from any fourth reference point to the center of the second projection. The second characteristic line segments include a third sub-line segment passing through the third reference point and a fourth sub-line segment passing through the fourth reference point. The third sub-line segment has a third length, and the fourth sub-line segment has a fourth length, and the third length is less than the fourth length. That is, on the first projection, the part farther from the center point of the second projection has a larger size, and the part closer to the center point of the second projection has a smaller size, so that the center of the first projection is as far away from the center point of the second projection as possible, and the first projection has a larger area, so as to avoid acoustic short circuit while ensuring that the first pressure relief hole has sufficient air permeability.

[0016] In some embodiments, the projection of the sound-emitting part on the reference plane has a long axis direction, and in the long axis direction, the third reference point and the fourth reference point are located on the same side of the second projection, so that the center of the first projection is as far away from the center point of the second projection as possible, and the pressure relief hole is as far away from the sound outlet hole as possible, so as to avoid acoustic short circuit.

[0017] In some embodiments, the projection of the sound-emitting part on the reference plane has a long axis direction, the first projection includes a first side parallel to the long axis direction and a second side opposite to the first side, and the third reference point and the fourth reference point are both located on the first side. By setting the third reference point and the fourth reference point both on the first side, it is convenient to delineate the third sub-segment and the fourth sub-segment in the second characteristic line segment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] This specification will be further described in the form of exemplary embodiments, which will be described in detail by the accompanying drawings. These embodiments are not restrictive, and in these embodiments, the same number represents the same structure, wherein:

[0019] Figure 1 is a schematic diagram of an exemplary ear according to some embodiments of the present application;

[0020] Figure 2A is an exemplary structural diagram of an acoustic device according to some embodiments of this specification;

[0021] Figure 2B yes Figure 2A Another exemplary structural diagram of the acoustic device shown;

[0022] Figure 3 is a schematic diagram of an exemplary internal structure of a sound-producing part according to some embodiments of this specification;

[0023] Figure 4A and Figure 4B It is a schematic diagram of the different inner sides shown in this manual;

[0024] Figure 5 is an exemplary structural diagram of a pressure relief hole according to some embodiments of this specification;

[0025] Fig. 6A and Figure 6B is a schematic diagram of a projection of a sound-emitting part on a first reference plane according to some embodiments of this specification;

[0026] Figure 7 It is a schematic diagram of a frequency response curve of the pressure relief hole corresponding to the acoustic device when the second side and the first side are at different angles according to some embodiments of this specification;

[0027] Fig. 8A is a schematic diagram of the positions of the first reference point and the second reference point according to some embodiments of this specification;

[0028] Figure 8B is a schematic diagram of the positions of the third reference point and the fourth reference point according to some embodiments of this specification;

[0029] Fig. 9 is an exemplary structural diagram of a second pressure relief hole according to some embodiments of this specification;

[0030] Fig. 10A and Fig. 10B It is a schematic diagram of the positions of different reference points shown in some embodiments of this specification. DETAILED DESCRIPTION

[0031] In order to more clearly illustrate the technical solutions of the embodiments of this specification, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of this specification. For ordinary technicians in this field, this specification can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0032] In an acoustic device, a sound hole is generally designed to output the sound from the front side of the diaphragm, while a pressure relief hole is designed to output the sound from the rear side of the diaphragm. Through the design of the sound hole and the pressure relief hole, the sounds output by the two can cancel each other out in anti-phase in the far field, which helps to reduce the sound leakage of the acoustic device in the far field. At the same time, in order to avoid the sound output by the sound hole and the pressure relief hole canceling each other out in the near field, causing an acoustic short circuit and affecting the user's listening effect, the pressure relief hole needs to be set as far away from the sound hole as possible. On the other hand, in order to reduce the impact of standing waves, the pressure relief hole needs to have a larger opening area to ensure sufficient air permeability. In order to solve the above problems, the present application designs the shape of the pressure relief hole so that the part of the pressure relief hole close to the sound hole is narrower, and the part of the pressure relief hole away from the sound hole is wider, thereby avoiding acoustic short circuits while ensuring that the pressure relief hole has sufficient air permeability.

[0033] Figure 1 is a schematic diagram of an exemplary ear according to some embodiments of the present application. Figure 1, the ear 100 may include an external auditory canal 101, a cavity concha 102, a cymba concha 103, a triangular fossa 104, an antihelix 105, a scaphoid 106, an auricle 107, an earlobe 108, and an auricle crus 109. In some embodiments, the wearing and stabilization of the acoustic device can be achieved with the help of one or more parts of the ear 100. In some embodiments, the external auditory canal 101, the cavity concha 102, the cymba concha 103, the triangular fossa 104, and other parts have a certain depth and volume in three-dimensional space, which can be used to achieve the wearing requirements of the acoustic device. For example, an acoustic device (for example, an in-ear headphone) can be worn in the external auditory canal 101. In some embodiments, the wearing of the acoustic device can be achieved with the help of other parts of the ear 100 except the external auditory canal 101. For example, the wearing of the acoustic device can be achieved with the help of the cymba concha 103, the triangular fossa 104, the antihelix 105, the scaphoid 106, the auricle 107, and other parts or a combination thereof. In some embodiments, in order to improve the comfort and reliability of the acoustic device in wearing, it is also possible to further use the user's earlobe 108 and other parts. By using other parts of the ear 100 other than the external auditory canal 101 to achieve the wearing of the acoustic device and the propagation of sound, the user's external auditory canal 101 can be "liberated" and the impact of the acoustic device on the user's ear health can be reduced. When the user wears the acoustic device on the road, the acoustic device will not block the user's external auditory canal 101. The user can receive both the sound from the acoustic device and the sound from the environment (for example, horns, car bells, surrounding human voices, traffic control sounds, etc.), thereby reducing the probability of traffic accidents. For example, when the user wears the acoustic device, the entire or partial structure of the acoustic device can be located on the front side of the helix crus 109. For another example, when the user wears the acoustic device, the entire or partial structure of the acoustic device may contact the upper part of the external auditory canal 101 (for example, the location of one or more parts such as the crus helix 109, the cymba concha 103, the triangular fossa 104, the antihelix 105, the scaphoid 106, and the helix 107). For another example, when the user wears the acoustic device, the entire or partial structure of the acoustic device may be located in one or more parts of the ear (for example, the cavum concha 102, the cymba concha 103, the triangular fossa 104, etc.).

[0034] Furthermore, different users may have individual differences, resulting in different shapes, sizes and other dimensional differences in the ears. For the convenience of description and to reduce the individual differences between different users, a simulator containing a head and its (left and right) ears can be made based on ANSI: S3.36, S3.25 and IEC: 60318-7 standards, such as GRAS 45BC KEMAR. Therefore, in this application, descriptions such as "user wears", "in a wearing state" and "in a wearing state" may refer to the acoustic device described in this application being worn on the ear of the aforementioned simulator. Of course, precisely because different users have individual differences, the structure, shape, size, thickness, etc. of one or more parts of the ear 100 may be different, and when the acoustic device is worn by different users, there may be certain differences from the acoustic device worn on the ear of the aforementioned simulator, but such differences should be tolerated.

[0035] It should be noted that in the fields of medicine and anatomy, three basic planes of the human body can be defined: the sagittal plane, the coronal plane, and the horizontal plane, as well as three basic axes: the sagittal axis, the coronal axis, and the vertical axis. Among them, the sagittal plane refers to a plane perpendicular to the ground along the front-back direction of the body, which divides the human body into left and right parts; the coronal plane refers to a plane perpendicular to the ground along the left-right direction of the body, which divides the human body into front and back parts; the horizontal plane refers to a plane parallel to the ground along the up-down direction of the body, which divides the human body into upper and lower parts. Correspondingly, the sagittal axis refers to an axis along the front-back direction of the body and perpendicular to the coronal plane, the coronal axis refers to an axis along the left-right direction of the body and perpendicular to the sagittal plane, and the vertical axis refers to an axis along the up-down direction of the body and perpendicular to the horizontal plane. Furthermore, the "front side of the ear" mentioned in this application is a concept relative to the "back side of the ear". The former refers to the side of the ear away from the head, and the latter refers to the side of the ear facing the head. They are both for the user's ear. Among them, by observing the ear of the above simulator along the direction of the human coronal axis, it can be obtained that Figure 1 Schematic diagram of the front profile of the ear shown.

[0036] The description of the ear 100 is for illustrative purposes only and is not intended to limit the scope of the present application. A person skilled in the art can make various changes and modifications based on the description of the present application. For example, a partial structure of the acoustic device can shield part or all of the external auditory canal 101. These changes and modifications are still within the scope of protection of the present application.

[0037] Figure 2Ais an exemplary structural diagram of an acoustic device according to some embodiments of this specification, Figure 2B yes Figure 2A Another exemplary structural diagram of the acoustic device shown, Figure 3 Schematic diagram of the exemplary internal structure of the sound-generating part according to some embodiments of this specification. Figure 2A and Figure 2B As shown, the acoustic device 10 may include a sound-emitting portion 11 and a suspension structure 12. In some embodiments, the acoustic device 10 may be mounted on the user's body (eg, the head, neck, or upper torso) by the suspension structure 12 so that the sound-emitting portion 11 is worn on the user's body.

[0038] In some embodiments, the suspension structure 12 may be an arc structure adapted to the user's auricle, so that the suspension structure 12 may be suspended at the user's upper auricle. In some embodiments, the suspension structure 12 may also be a clamping structure adapted to the user's auricle, so that the suspension structure 12 may be clamped at the user's auricle. In some embodiments, one end of the suspension structure 12 away from the auricle may be connected to the sound-emitting portion 11, and the other end thereof may extend along the user's auricle. In some embodiments, the suspension structure 12 may include but is not limited to ear hooks, elastic bands, etc., so that the acoustic device 10 can be better fixed to the user to prevent the user from falling during use.

[0039] like Figure 2A-Figure 3As shown, in some embodiments, the sound-emitting part 11 can be used to be worn on the user's body, and the sound-emitting part 11 can include a housing 111 and a diaphragm 113 contained in the housing 111, and the diaphragm 113 vibrates to generate sound input to the user's ear 100. In some embodiments, the acoustic device 10 can be combined with products such as glasses, headphones, head-mounted display devices, AR / VR helmets, etc. In this case, the sound-emitting part 11 can be fixed near the user's ear 100 by hanging or clamping. In some embodiments, the shape of the housing 111 can be adapted to the human ear 100, for example, the shape of the housing 111 can be circular, elliptical, polygonal (regular or irregular), U-shaped, V-shaped, semicircular, etc., so that the sound-emitting part 11 can be directly hung at the user's ear 100. In some embodiments, the sound-emitting part 11 can have a long axis direction Y and a short axis direction (i.e., height or width direction) Z that are perpendicular to the thickness direction X and orthogonal to each other. Among them, the long axis direction Y can be defined as the direction in which the sound-emitting part 11 approaches or moves away from the back of the user's head in the wearing state, and the short axis direction Z can be defined as the direction in which the sound-emitting part 11 approaches or moves away from the top of the user's head in the wearing state. Among them, the thickness direction X can be consistent with the direction of the coronal axis, both pointing to the left and right directions of the body, or the thickness direction X can be defined as the direction in which the sound-emitting part 11 approaches or moves away from the user's head in the wearing state. In some embodiments, when the sound-emitting part 11 is in a horizontal state in the wearing state, the long axis direction Y can be consistent with the direction of the sagittal axis, both pointing to the front and back directions of the body, and the short axis direction Z can be consistent with the direction of the vertical axis, both pointing to the up and down directions of the body. In other embodiments, when the sound-emitting part 11 is in an inclined state in the wearing state, the long axis direction Y and the short axis direction Z are still parallel to the sagittal plane, and the long axis direction Y can have a certain angle with the direction of the sagittal axis, that is, the long axis direction Y is also tilted accordingly, and the short axis direction Z can have a certain angle with the direction of the vertical axis, that is, the short axis direction Z is also tilted.

[0040] In some embodiments, when the user wears the acoustic device 10, the sound-emitting part 11 may be located above, below, in front of (e.g., in front of the tragus) or inside the auricle (e.g., in the concha cavity) of the user's ear 100. Two or more acoustic holes for transmitting sound may also be provided on the housing 111 of the sound-emitting part 11. In some embodiments, the speaker in the sound-emitting part 11 may output sounds with a phase difference (e.g., opposite phases) through the two acoustic holes.

[0041] In some embodiments, the acoustic device 10 may include but is not limited to air conduction headphones, bone conduction headphones, etc. In some embodiments, the acoustic device 10 may be an open-type headphone, and when the acoustic device 10 is in a worn state, it may not block the user's external auditory canal 101. In some embodiments, the projection of the acoustic device 10 on the user's ear plane may partially or completely cover but not block the user's external auditory canal 101. In other embodiments, the projection of the acoustic device 10 on the user's ear plane may not cover the user's external auditory canal 101.

[0042] In some embodiments, the sound-emitting portion 11 may have a connection end CE connected to the suspension structure 12 and a free end FE not connected to the suspension structure 12, and the free end FE is arranged away from the connection end CE. In some embodiments, the sound-emitting portion 11 may have an inner side surface IS facing the ear and an outer side surface OS away from the ear arranged along the thickness direction X in the wearing state, and a connection surface connecting the inner side surface IS and the outer side surface OS. Further, at least part of the aforementioned connection surface is located in the concha cavity in the wearing state, and forms a first contact area with the front side of the above-mentioned ear area (for example, the ear area corresponding to the concha cavity, the antihelix, etc.), and the suspension structure 12 forms a second contact area with the rear side of the above-mentioned ear area in the wearing state, and the aforementioned second contact area and the aforementioned first contact area at least partially overlap in the ear thickness direction of the above-mentioned ear area. In this way, not only can the sound-emitting portion 11 and the suspension structure 12 clamp the ear from the front and back sides of the ear together, but the clamping force formed is mainly manifested as compressive stress, which is conducive to improving the stability and comfort of the acoustic device 10 in the wearing state. In the worn state, when observed along the direction of the coronal axis (i.e., the thickness direction X), the sound-emitting part 11 (shell 111) can be set to a circular, elliptical, rounded square, rounded rectangle, etc. shape. Among them, when the sound-emitting part 11 is set to a circular, elliptical, etc. shape, the above-mentioned connecting surface may refer to the arc-shaped side surface of the shell 111 of the sound-emitting part 11; and when the sound-emitting part 11 is set to a rounded square, rounded rectangle, etc. shape, the above-mentioned connecting surface may include the lower side surface LS, upper side surface US and rear side surface RS mentioned later. In some embodiments, the connecting surface may also include edges connecting the side surfaces, for example, an arc-shaped edge connecting the upper side surface US and the inner side surface IS. Therefore, for the convenience of description, this embodiment takes the sound-emitting part 11 set to a rounded rectangle as an example for illustrative description. In some embodiments, the sound-emitting portion 11 may have an upper side surface US and a lower side surface LS arranged along the short axis direction Z, and a rear side surface RS connecting the upper side surface US and the lower side surface LS, wherein the upper side surface US is located at one end toward the top of the head along the short axis direction Z when worn, the rear side surface RS is located at one end toward the back of the head along the long axis direction Y when worn, and at least part of the free end FE is located at the rear side surface RS. In some embodiments, as Figure 2AAs shown, the positive direction of the long axis direction Y may point to the connecting end CE, the positive direction of the short axis direction Z may point to the upper side US, and the positive direction of the thickness direction X may point to the outer side OS.

[0043] Figure 4A and Figure 4B It is a schematic diagram of the different inner sides shown in this manual. Figure 2B and Figure 4A , Figure 4B As shown, in some embodiments, the housing 111 is provided with a sound outlet 111a on the inner side IS facing the ear in the wearing state, and the sound outlet 111a is configured to guide the sound generated by the front side of the diaphragm 113 out of the housing 111 so as to be transmitted to the user's external auditory canal 101. In some embodiments, the shape of the sound outlet 111a can be circular, runway-shaped (such as Figure 2B As shown), U-shaped (as Figure 4A as shown) or L-type (as Figure 4B ), etc., by designing the shape of the sound hole 111a, the space on the inner side IS can be reasonably utilized to make the sound hole 111a closer to the external auditory canal when worn, and at the same time, the resonance frequency of the front cavity on the front side of the diaphragm 133 connected to the sound hole 111a can be adjusted, thereby improving the output performance of the acoustic device 10.

[0044] In some embodiments, other sides of the shell 111 (for example, the lower side LS, the upper side US, the outer side OS, the rear side RS, etc.) except the inner side IS are provided with pressure relief holes (for example, at least one of the first pressure relief hole and the second pressure relief hole), and the pressure relief holes are configured to guide the sound generated by the rear side of the diaphragm 113 out of the shell 111.

[0045] Figure 5 is an exemplary structural diagram of a pressure relief hole according to some embodiments of this specification, Fig. 6A and Figure 6B It is a schematic diagram of the projection of the sound-emitting part on the first reference plane according to some embodiments of the present specification.

[0046] In some embodiments, the pressure relief hole 111b may include an effective air permeable port. Specifically, the diaphragm 113 may be connected to the housing 111 through the bracket 112, and the pressure relief hole 111b (such as the first pressure relief hole 111b-1, the second pressure relief hole 111b-2, etc.) includes an external port opened on the housing 111 and an internal port surrounded by the bracket 112 and the housing 111. Figure 3 and Figure 5 As shown, the area enclosed by the inner port is smaller than the area enclosed by the outer port, and the inner port constitutes an effective ventilating port. Figure 3 The external port may refer to the port where the pressure relief hole 111b is disposed outside the housing 111, that is, point O 1With point O 2 the inner port may refer to the pressure relief hole 111b disposed on the inner side of the housing 111 and the port surrounded by the bracket 112, ie, point O 3 With point O 4 In some embodiments, refer to Figure 5 and Fig. 9 The external port refers to the pressure relief hole 111b provided on the housing 111 in a racetrack shape (eg Figure 5 and Fig. 9 The inner port refers to the port surrounded by the housing 111 and the bracket 112, for example, Figure 5 Zhongyu Fig. 6A , Figure 6B The port of the shape corresponding to the projection 111b-1' shown, which is surrounded by the inner racetrack shape and the bracket 112, or Fig. 9 Zhongyu Fig. 10A , Fig. 10B The projection 111 b - 2 ′ shown corresponds to a port shaped by the inner racetrack shape and the bracket 112 .

[0047] In some embodiments, the distance between the pressure relief hole 111b and the sound outlet hole 111a may be 12mm-20mm, so that a larger distance is maintained between the pressure relief hole 111b and the sound outlet hole 111a to avoid acoustic short circuits, and at the same time, to avoid the size of the sound-emitting part 11 being too large due to the large distance between the pressure relief hole 111b and the sound outlet hole 111a, thereby improving the wearing comfort of the acoustic device 10. In some embodiments, in order to further avoid acoustic short circuits and to avoid the size of the sound-emitting part 11 being too large, the distance between the pressure relief hole 111b and the sound outlet hole 111a may be 13mm-17mm. The distance between the pressure relief hole 111b and the sound outlet hole 111a may refer to the distance between the center (e.g., centroid) of the pressure relief hole 111b and the center point M (e.g., centroid) of the sound outlet hole 111a. In some embodiments, the center point M of the sound outlet hole 111a may be the centroid of the outer end surface of the sound outlet hole 111a. In some embodiments, the center point M of the sound outlet hole 111a may also be a selected point that meets the design requirements. For example, when the shape of the sound outlet hole 111a is a semi-circular shape, the center point M may be located at the point where the inner circle of the semi-circular shape intersects the symmetry axis; for another example, when the shape of the sound outlet hole 111a is an L-shape, the center point M may be a corner point. In some embodiments, the center point M of the sound outlet hole 111a may be the equivalent centroid of the outer end surface of the sound outlet hole 111a, such as Figure 4A or Figure 4B shown.

[0048] In some embodiments, the pressure relief hole 111b includes an effective air permeable port, and the effective air permeable port has a first projection 111b' on a reference plane S. The reference plane S may be parallel to or tangent to the side where the effective air permeable port is located. Exemplarily, the pressure relief hole 111b may be disposed on the upper side surface US of the sound-emitting portion 11, and the effective air permeable port of the pressure relief hole 111b has a first projection 111b' on the reference plane S. When the upper side surface US is a plane, the reference plane S may be parallel to the upper side surface US, or the plane where the upper side surface US is located may be the reference plane S; when the upper side surface US is a curved surface, the reference plane S may be tangent to the upper side surface US.

[0049] In some embodiments, the reference plane S may intersect the inner side surface IS of the sound-emitting portion 11 perpendicularly or obliquely.

[0050] In some embodiments, the sound outlet hole 111a has a second projection on the reference plane S. In some embodiments, the reference plane S may be perpendicular to the inner side surface IS. For example, when the pressure relief hole 111b is disposed on the upper side surface US and is not located at the edge of the upper side surface US, the second projection corresponding to the sound outlet hole 111a is a line segment, such as Fig. 6A and Figure 6B In some embodiments, the reference plane S may not be perpendicular to the inner side surface IS (for example, when the pressure relief hole 111b is disposed at the edge where the upper side surface US and the inner side surface IS intersect), in which case the second projection corresponding to the sound outlet hole 111a is a closed geometric figure. For ease of description, the projection point M of the center point M of the sound outlet hole 111a on the reference plane S may be used as 1 represents the position of the second projection; or, the centroid or center of the second projection (eg, point M 1 ) represents the position of the second projection.

[0051] Please refer to Fig. 6A In some embodiments, when the reference plane S is perpendicular to the inner side surface IS, the second projection corresponding to the sound outlet 111a can be a line segment. The first projection 111b' can define a plurality of mutually parallel first characteristic line segments La that are perpendicular to the inner side surface IS and whose ends are both located at the contour of the first projection 111b'. The end point of any first characteristic line segment La that is farther from the second projection among the two end points can be a reference point A. The plurality of reference points A include the first reference point A. 1 With the second reference point A 2 Among them, any first reference point A 1 The distance to the second projection is less than any second reference point A 2 To the distance of the second projection. It should be noted that since the second projection is a line segment (such as Fig. 6A As shown), reference point A (eg, first reference point A 1 With the second reference point A 2) to the second projection, that is, the length of the perpendicular line segment from the reference point A to the second projection. The first characteristic line segments La include the line passing through the first reference point A. 1 The first sub-segment La 1 and through the second reference point A 2 The second sub-segment La 2 , the first sub-segment La 1 The second sub-segment La has a first length. 2 The first length is smaller than the second length. That is, on the first projection 111b', the part farther from the second projection has a larger size, and the part closer to the second projection has a smaller size, so that the center of the first projection 111b' is as far away from the second projection as possible, and the first projection 111b' has a larger area, so as to avoid acoustic short circuit and ensure that the pressure relief hole 111b has sufficient air permeability.

[0052] Please refer to Figure 6B In some embodiments, when the reference plane S is perpendicular or inclined to the inner side surface IS, the projection point M of the center point M of the sound outlet hole 111a on the reference plane S can be used as the projection point M 1 represents the position of the second projection; or, the centroid or center of the second projection (eg, point M 1 ) represents the position of the second projection. At this time, the first projection 111b' can define a plurality of second characteristic line segments Lb that are perpendicular to the inner side surface IS and whose ends are both located at the contour of the first projection 111b' and are parallel to each other. The distance between the two end points of any second characteristic line segment Lb and the center point M of the second projection is 1 The closer endpoint is reference point B, and the multiple reference points B include the third reference point B 1 With the fourth reference point B 2 Among them, any third reference point B 1 To the center point M of the second projection 1 The distance is less than any fourth reference point B 2 To the center point M of the second projection 1 The plurality of second characteristic line segments Lb include the third reference point B 1 The third sub-segment Lb 1 and through the fourth reference point B 2 The fourth sub-segment Lb 2 , the third sub-segment Lb 1 The fourth sub-line segment Lb has a third length. 2 has a fourth length, and the third length is less than the fourth length. That is, on the first projection 111b', the distance from the center point M of the second projection 1 The farther the part is, the larger the size is, and the distance from the center point M of the second projection is 1The closer the part, the smaller the size, so that the center of the first projection 111b' is as far away from the center point M of the second projection as possible. 1 At the same time, the first projection 111b' has a larger area to avoid acoustic short circuit while ensuring that the first pressure relief hole 111b has sufficient air permeability.

[0053] In some embodiments, on the acoustic device 10, a first characteristic line segment La (or a second characteristic line segment Lb) can be defined on the effective air permeability port of the pressure relief hole 111b. The closer the reference point A of the first characteristic line segment La (or the reference point B of the second characteristic line segment Lb) is to the centroid of the sound outlet hole 111a, the shorter the length of the first characteristic line segment La (or the second characteristic line segment Lb) corresponding to the reference point A (or the reference point B). That is, the size of the portion of the pressure relief hole 111b close to the sound outlet hole 111a is small, and the size of the portion away from the sound outlet hole 111a is large. In this way, while avoiding acoustic short circuit, it is ensured that the pressure relief hole 111b has sufficient air permeability.

[0054] In some embodiments, the projection of the sound-emitting part 11 on the reference plane S has a long axis direction Y', and the long axis direction Y' of the projection can be the same direction as the long axis direction Y of the sound-emitting part 11, or the long axis direction Y' of the projection can have an angle of no more than 10° with the long axis direction Y of the sound-emitting part.

[0055] In some embodiments, in the long axis direction Y' of the projection of the sound-emitting part 11 on the reference plane S, the third reference point B 1 With the fourth reference point B 2 Can be located at the center point M of the second projection 1 That is, the first projection 111b' is located at the center point M of the second projection in the long axis direction Y'. 1 on the same side of the first projection 111b', so that the center of the first projection 111b' is as far away from the center point M of the second projection as possible. 1 , so that the pressure relief hole 111b is as far away from the sound outlet hole 111a as possible to avoid the phenomenon of acoustic short circuit. Figure 6B , exemplarily, the reference point B is relative to the center point M of the second projection 1 Both are located on the side closer to the connection end CE.

[0056] In some embodiments, on the acoustic device 10, in the long axis direction Y, the pressure relief hole 111b can be located as a whole on the same side of the sound outlet hole 111a, so that the center of the pressure relief hole 111b is as far away from the sound outlet hole 111a as possible, and then the pressure relief hole 111b is as far away from the sound outlet hole 111a as possible to avoid the acoustic short circuit phenomenon. In other embodiments, in the long axis direction Y, the sound outlet hole 111a can also at least partially overlap with the pressure relief hole 111b, while avoiding the acoustic short circuit phenomenon as much as possible, reducing the impact of the opening of the acoustic hole on the overall size of the acoustic device.

[0057] In some embodiments, the first projection 111b' includes a first side edge (not marked in the figure) parallel to the long axis direction Y' and a second side edge (not marked in the figure) disposed opposite to the first side edge.

[0058] In some embodiments, since the first side edge of the first projection 111b' is substantially parallel to the long axis direction Y' of the projection of the sound-emitting portion 11 on the reference plane S, the first side wall of the effective air permeable port of the pressure relief hole 111b corresponding to the first side edge is substantially parallel to the long axis direction Y of the sound-emitting portion 11, and at the same time, the effective air permeable port of the pressure relief hole 111b has a second side wall corresponding to the second side edge, and the relative relationship between the first side wall and the second side wall may be substantially the same as the relative relationship between the first side edge and the second side edge.

[0059] Please refer to Figure 6B , first reference point A 1 With the second reference point A 2 The first reference point A 1 With the second reference point A 2 Both are located on the second side, which is convenient for limiting the first reference point A 1 The distance to the line segment shown by the second projection and the second reference point A 2 The distance to the line segment shown by the second projection is convenient for delineating the first sub-line segment La 1 With the second sub-segment La 2 , and then the pressure relief hole 111b is designed into a more regular shape to reduce the processing difficulty of the pressure relief hole 111b.

[0060] Please refer to Figure 6B In some embodiments, the third reference point B 1 With the fourth reference point B 2 By setting the third reference point B 1 With the fourth reference point B 2 Both are located on the first side, which is convenient for demarcating the third sub-segment Lb in the second characteristic line segment Lb 1 With the fourth sub-segment Lb 2 , and then the pressure relief hole 111b is designed into a more regular shape to reduce the processing difficulty of the pressure relief hole 111b.

[0061] On the other hand, please refer to Figure 5 and Fig. 6AThe first side wall of the effective vent port of the pressure relief hole 111b can be surrounded by the bracket 112. When the inclination angle of the pressure relief hole 111b relative to the long axis direction Y is different, the first side wall remains substantially parallel to the long axis direction Y, that is, the first side edge of the first projection 111b' remains substantially parallel to the long axis direction Y', and the position of the reference point B on the first projection 111b' corresponding to the pressure relief holes 111b with different inclinations remains unchanged, which is convenient for distinguishing the third sub-line segment Lb 1 With the fourth sub-segment Lb 2 .

[0062] Please refer to Fig. 6A In some embodiments, as the distance between the reference point A and the second projection of the first characteristic line segment La increases (i.e., the length of the line segment perpendicular to the second projection through the reference point A), the length of the first characteristic line segment La also increases accordingly. That is, the part of the first projection 111b' that is farther from the second projection has a larger size, thereby making the centroid of the first projection 111b' farther from the second projection, thereby making the pressure relief hole 111b farther from the sound outlet hole 111a, thereby avoiding the occurrence of acoustic short circuit.

[0063] Please refer to Figure 6B In some embodiments, in the long axis direction Y', as the reference point B of the second characteristic line segment Lb and the center of the second projection (ie, point M 1 ) increases, the length of the second characteristic line segment Lb also increases accordingly. That is, the first projection 111b' is 100 times the distance from the center point M of the second projection. 1 The farther the part is, the larger the size is, so that the centroid of the first projection 111b' is M away from the center point of the second projection. 1 As a result, the pressure relief hole 111b is farther away from the sound outlet hole 111a, thereby avoiding the occurrence of acoustic short circuit.

[0064] In some embodiments, the length of the first characteristic line segment La or the second characteristic line segment Lb is 0.5 mm-1.6 mm, so that the first projection 111b' has a larger area, that is, the effective air permeability port of the pressure relief hole 111b has a larger area, ensuring that the pressure relief hole 111b has sufficient air permeability. In some embodiments, on the acoustic device 10, the size of the pressure relief hole 111b in the thickness direction X of the sound-emitting part 11 is 0.5 mm-1.6 mm.

[0065] In some embodiments, the first characteristic line segment La or the second characteristic line segment Lb has a minimum length. The minimum length of the first characteristic line segment La may refer to the length of the first characteristic line segment La corresponding to the reference point A on the second side of the first projection 111b' that is closest to the second projection, for example Fig. 6A The first leftmost sub-segment La 1The minimum length of the second characteristic line segment Lb may refer to the distance from the first side of the first projection 111b' to the center point M of the second projection. 1 The length of the second characteristic line segment Lb corresponding to the nearest reference point B, for example Figure 6B The third leftmost sub-line segment Lb shown 1 If the minimum length of the first characteristic line segment La or the second characteristic line segment Lb is too small, a sharper angle will be formed at one end of the first pressure relief hole 111b close to the sound outlet hole 111a, which will lead to the reflection of the sound with a shorter wavelength and introduce noise, affecting the listening effect. In some embodiments, in order to avoid the output of the acoustic device 10 from being mixed with noise, the minimum length of the first characteristic line segment La or the first characteristic line segment Lb may be not less than 0.5 mm, for example, 0.5 mm-1 mm.

[0066] In some embodiments, the effective air permeable port of the pressure relief hole 111b near one end of the sound outlet hole 111a may be a circular arc segment, that is, the ends of the first side wall and the second side wall near the sound outlet hole 111a may be connected by a circular arc segment to minimize the impact of sound wave reflection on listening. Fig. 6A As shown, at this time, the first side and the second side of the first projection 111b' can be connected by the projection of the aforementioned arc segment on the reference plane S, and an endpoint of the first characteristic line segment La or the second characteristic line segment Lb of the minimum length can be the connection point between the arc segment projection and the second side.

[0067] In some embodiments, the maximum length of the first characteristic line segment La may refer to the length of the first characteristic line segment La corresponding to the reference point A on the second side of the first projection 111b' which is farthest from the second projection, for example Fig. 6A The second rightmost sub-segment La 2 In some embodiments, the maximum length of the second characteristic line segment Lb may refer to the distance from the first side of the first projection 111b' to the center point M of the second projection. 1 The length of the second characteristic line segment Lb corresponding to the farthest reference point B is, for example Figure 6B The second rightmost sub-line segment Lb is shown 2 . If the maximum length of the first characteristic line segment a or the second characteristic line segment b is too large, the area of ​​the first pressure relief hole 111b will be too large. In order to avoid the first pressure relief hole 111b from being connected to the front cavity on the front side of the diaphragm 113, the size of the rear cavity on the rear side of the diaphragm 113 needs to be designed to be larger, which will cause the size of the sound-emitting part 11 to be too large, affecting the wearing comfort and portability of the acoustic device 10. In some embodiments, in order to avoid the size of the acoustic device 10 being too large and to improve the wearing comfort and portability of the acoustic device 10, the maximum length of the first characteristic line segment La or the first characteristic line segment Lb may be no greater than 1.6 mm, for example, 1.2 mm-1.6 mm.

[0068] In some embodiments, the effective air permeable port of the pressure relief hole 111b away from the end of the sound outlet hole 111a may be a circular arc segment, that is, the ends of the first side wall and the second side wall away from the sound outlet hole 111a may be connected by a circular arc segment to minimize the impact of sound wave reflection on listening. Fig. 6A As shown, at this time, the first side and the second side of the first projection 111b' can be connected by the projection of the arc segment on the reference plane S, and an endpoint of the first characteristic line segment La or the second characteristic line segment Lb with the maximum length can be the connection point between the arc segment projection and the second side.

[0069] In some embodiments, in the acoustic device 10, the minimum dimension of the pressure relief hole 111b in the thickness direction X of the sound-emitting portion 11 may be no less than 0.5 mm (eg, 0.5 mm-1 mm), and the maximum dimension may be no greater than 1.6 mm (eg, 1.2 mm-1.6 mm).

[0070] In some embodiments, the first side of the first projection 111b' is substantially parallel to the long axis direction Y' of the projection of the sound-emitting portion 11 on the reference plane S, so that the first side wall of the effective air permeable port of the pressure relief hole 111b corresponding to the first side is substantially parallel to the long axis direction Y of the sound-emitting portion 11, and the effective air permeable port of the pressure relief hole 111b has a second side wall corresponding to the second side, and the relative relationship between the first side wall and the second side wall can be substantially the same as the relative relationship between the first side wall and the second side wall. Hereinafter, the inclination angle of the pressure relief hole 111b relative to the long axis direction Y may refer to the inclination angle of the second side wall of the effective air permeable port of the pressure relief hole 111b relative to the long axis direction Y.

[0071] Please refer to Figure 5 , Fig. 6A and Figure 6B In some embodiments, the angle θ between the second side and the first side is 1 It can reflect the area size of the first projection 111b', and thus reflect the area size of the effective air permeability port of the pressure relief hole 111b. Figure 5 Since the position of the bracket 112 is fixed, that is, the position of the first side wall of the effective air permeable port of the pressure relief hole 111b is fixed, when the angle θ between the second side and the first side 1 When the angle θ is larger, the inclination angle of the second side wall corresponding to the effective air permeable port of the pressure relief hole 111b relative to the long axis direction Y is larger. In other words, the greater the inclination of the pressure relief hole 111b and the effective air permeable port of the pressure relief hole 111b relative to the long axis direction Y, the larger the portion of the pressure relief hole 111b blocked by the bracket 112. Correspondingly, the area of ​​the effective air permeable port of the pressure relief hole 111b is smaller, resulting in insufficient air permeability of the pressure relief hole 111b. It should be noted that when the second side edge is completely an arc edge, the angle θ between the second side edge and the first side edge is1 It may refer to the angle between the tangent line of a specified point of the second side (e.g., the midpoint of the second side) and the first side, or the angle between the line connecting the two end points of the second side and the first side. When the second side includes an arcuate side and a straight side, the angle θ between the second side and the first side 1 It may refer to the angle between the straight side of the second side and the first side. In some embodiments, since the minimum length of the first characteristic line segment La or the second characteristic line segment Lb may be no less than 0.5 mm (e.g., 0.5 mm-1 mm), the second side may include an arcuate side and a straight line side, wherein the arcuate side may correspond to the projection of the arc segment described above on the reference plane S, the arcuate side is connected to an end of the first side relatively close to the second projection, and the straight line side is connected to an end of the first side relatively far from the second projection, so as to avoid the pressure relief hole 111b from forming a sharp angle as much as possible, thereby avoiding affecting the user's listening effect.

[0072] Figure 7 It is a schematic diagram of a frequency response curve of an acoustic device corresponding to a pressure relief hole when the second side edge and the first side edge form different angles according to some embodiments of the present specification.

[0073] Please refer to Figure 7 , where the curve L 71 The corresponding angle θ between the second side and the first side 1 The effective venting port of the pressure relief hole 111b is set at 0°, that is, the first side wall and the second side wall of the effective venting port of the pressure relief hole 111b are set along the long axis direction Y. At this time, the effective venting port of the pressure relief hole 111b can be set in a rectangular or rounded rectangular shape; the curve L 72 The corresponding angle θ between the second side and the first side 1 The curve L is set at 30°, that is, the first side wall of the effective air permeable port of the pressure relief hole 111b is set along the long axis direction Y, and the second side wall is set at an angle of 30° with the long axis direction Y; 73 The corresponding angle θ between the second side and the first side 1 The curve L is set at 45°, that is, the first side wall of the effective air permeable port of the pressure relief hole 111b is set along the long axis direction Y, and the second side wall is set at an angle of 45° to the long axis direction Y; 74 The corresponding angle θ between the second side and the first side 1 The arrangement is 60°, that is, the first side wall of the effective air permeable port of the pressure relief hole 111b is arranged along the long axis direction Y, and the second side wall is arranged at an angle of 60° to the long axis direction Y.

[0074] like Figure 7As shown, as the angle θ between the second side and the first side increases, the resonance frequency of the rear cavity on the rear side of the diaphragm 113 connected to the pressure relief hole 111b decreases, and the output sound pressure level of the acoustic device 10 at low frequencies is slightly improved. In some embodiments, in order to ensure that the resonance frequency of the rear cavity on the rear side of the diaphragm 113 connected to the pressure relief hole 111b is not less than 3kHz, so that the acoustic device 10 has a relatively flat output within a wider frequency band and improves the output performance of the acoustic device 10, on the acoustic device 10, the inclination angle of the effective air permeable port of the pressure relief hole 111b relative to the long axis direction Y can be 0°-45°. In some embodiments, in order to further improve the output performance of the acoustic device 10, the inclination angle of the effective air permeable port of the pressure relief hole 111b relative to the long axis direction Y can be 0°-30°.

[0075] In order to ensure that the pressure relief hole 111b has sufficient air permeability while improving the output performance of the acoustic device 10, the angle θ between the second side and the first side is 1 In some embodiments, in order to prevent the effective air permeability of the pressure relief hole 111b from being too small, and further ensure that the first pressure relief hole 111b has sufficient air permeability, the angle θ between the second side and the first side is 1 In some embodiments, in order to prevent the effective air permeability of the pressure relief hole 111b from being too small and to further ensure that the first pressure relief hole 111b has sufficient air permeability, the angle θ between the second side and the first side can be 30°-45°.

[0076] Please refer to Fig. 6A and Figure 6B In some embodiments, when the first projection 111b' is located on the same side of the second projection in the long axis direction Y', the first projection 111b' may have a first end closer to the second projection and a second end opposite to the first end in the long axis direction Y', and the first end has a first feature point Pb closest to the second projection. In some embodiments, the first feature point Pb may be based on the center point M of the second projection. 1 In some embodiments, when the second projection is a line segment, the first feature point Pb may be determined based on an endpoint of the second projection close to the first projection 111b'.

[0077] Fig. 8A is a schematic diagram of the positions of the first reference point and the second reference point according to some embodiments of this specification. Fig. 8A In some embodiments, the first reference point A 1 The first characteristic length between the first characteristic point Pb and the first sub-line segment La 1 The ratio of the first length to the first characteristic length is the first length ratio.1 The two endpoints (endpoint A 1 ', first reference point A 1 ) 1 'PbA 1 The angle corresponding to the first feature point Pb (i.e. ∠A 1 'PbA 1 ) of sin∠A 1 'PbA 1 The value is the first length ratio. The second reference point A 2 The second sub-line segment La has a second characteristic length from the first characteristic point Pb. 2 The ratio of the second length of the second characteristic length is the second length ratio. 2 The two endpoints (endpoint A 2 ', second reference point A 2 ) 2 'A 2 In Pb, the angle corresponding to the first feature point Pb (i.e. ∠A 2 'PbA 2 ) of sin∠

[0078] A 2 'PbA 2 The value is the second length ratio.

[0079] In some embodiments, the first length ratio may be greater than the second length ratio, so as to ensure that the length of the first characteristic line segment La increases as the distance from the reference point to the second projection increases, while preventing the first projection 111b' from being too large. This ensures that the pressure relief hole 111b has sufficient air permeability while avoiding sound wave interference as much as possible; at the same time, it prevents the pressure relief hole 111b from being too large, which would cause the sound-emitting part 11 to be too large, affecting the wearing comfort and portability of the acoustic device 10. Specifically, due to the fact that point Pb and point A 1 ', point A 2 'Colinear (i.e. point Pb, point A 1 ', point A 2 ' are both on the first side), and the first sub-segment La 1 (i.e. connecting line A 1 A 1 ') perpendicular to the line PbA 1 ', the second sub-segment La 2 (i.e. connecting line A 2 A 2 ') perpendicular to the line PbA 1 '. When the first reference point A 1 Located in triangle A 2 A 2 'Pb outside, indicating ∠A1 PbA 1 'Greater than ∠A 2 PbA 2 ', that is, the first length ratio is greater than the second length ratio, such as Fig. 6A At this time, the curvature of the second side of the first projection 111b' changes more gently, in other words, the curvature of the second side wall of the effective vent port of the pressure relief hole 111b changes more gently, specifically, compared with the line connecting the two end points of the second side, the second side protrudes downward to reduce the difficulty of processing the pressure relief hole 111b.

[0080] In some examples, the first length ratio may be equal to the second length ratio, in which case the first projection may be a regular triangular structure or a rectangular structure, that is, the line connecting the two end points of the second side is the second side. 1 Located in triangle A 2 A 2 'Pb's hypotenuse A 2 When Pb is on, it means ∠A 1 PbA 1 'Equal to ∠A 2 PbA 2 ', that is, the first length ratio is equal to the second length ratio.

[0081] In some embodiments, the curvature of the second side of the first projection 111b' changes more dramatically. In other words, the curvature of the second side wall of the effective air permeable port of the pressure relief hole 111b changes more dramatically, such as Fig. 8A As shown. At this time, the first reference point A 1 Located in triangle A 2 A 2 'Pb, indicating ∠A 1 PbA 1 ' is less than ∠A 2 PbA 2 ', that is, the first length ratio is smaller than the second length ratio. Specifically, compared with the line connecting the two end points of the second side, the second side protrudes upward. As a result, the first characteristic line segment La, which is farther from the second projection, changes more dramatically and increases more. Therefore, the part of the first projection 111b' that is farther from the second projection increases more in size, and the center of the first projection 111b' is farther from the second projection, and the pressure relief hole 111b is farther from the sound outlet 111a, so as to avoid acoustic short circuit.

[0082] Figure 8B is a schematic diagram of the positions of the third reference point and the fourth reference point according to some embodiments of this specification. Figure 8B , the third reference point B 1There is a third characteristic length between the first characteristic point Pb and the third sub-line segment Lb 1 The ratio of the third length of the first characteristic point Pb to the third characteristic length is the third length ratio. 1 two endpoints (for example, one of which is the third reference point B 1 The other end point is point B 1 ') formed by the triangle B 1 B 1 'Pb, the angle corresponding to the first feature point Pb (ie ∠B 1 PbB 1 ') of tan∠B 1 PbB 1 ' value is the third length ratio. The fourth reference point B 2 There is a fourth characteristic length between the first characteristic point Pb and the fourth sub-line segment Lb 2 The ratio of the fourth length of the first characteristic point Pb to the fourth characteristic length is the fourth length ratio. 2 The two endpoints (for example, one of the endpoints is the fourth reference point B 2 The other end point is point B 2 ') formed by the triangle B 2 B 2 'Pb, the angle corresponding to the first feature point Pb (ie ∠B 2 PbB 2 ') of tan∠B 2 PbB 2 'The value is the fourth length ratio.

[0083] In some embodiments, the third length ratio may be greater than the fourth length ratio, so as to ensure that the length of the first characteristic line segment Lb increases as the distance from the reference point to the center of the second projection increases, while preventing the first projection 111b' from being too large. This ensures that the pressure relief hole 111b has sufficient air permeability while avoiding sound wave interference as much as possible; at the same time, it prevents the pressure relief hole 111b from being too large, which will cause the sound-emitting part 11 to be too large, affecting the wearing comfort and portability of the acoustic device 10. Specifically, due to the fact that point Pb and point B 1 , Point B 2 Collinear (i.e. point Pb, point B 1 , Point B 2 are both on the first side), and the third sub-segment Lb 1 (i.e. line B 1 B 1 ') perpendicular to the line PbB 1 , the fourth sub-segment Lb 2 (i.e. line B 2 B 2 ') perpendicular to the line PbB2 When point B 1 'Located in triangle B 2 B 2 'Pb outside, indicating ∠B 1 PbB 1 'Greater than ∠B 2 PbB 2 ', that is, the third length ratio is greater than the fourth length ratio, such as Figure 6B At this time, the curvature of the second side of the first projection 111b' changes more gently. Specifically, compared with the line connecting the two end points of the second side, the second side protrudes downward. In other words, the curvature of the second side wall of the effective air permeable port of the pressure relief hole 111b changes more gently, so as to reduce the difficulty of processing the pressure relief hole 111b.

[0084] In some examples, the third length ratio may be equal to the fourth length ratio, and the first projection may be a regular triangular structure or a rectangular structure, that is, the line connecting the two end points of the second side is the second side. 1 'Located in triangle B 2 B 2 'Pb's hypotenuse B 2 'Pb on, indicating ∠B 1 PbB 1 ' is equal to ∠B 2 PbB 2 ', that is, the third length ratio is equal to the fourth length ratio.

[0085] In some embodiments, the curvature of the second side of the first projection 111b' changes more dramatically. In other words, the curvature of the second side wall of the effective air permeable port of the pressure relief hole 111b changes more dramatically, such as Figure 8B As shown. When point B 1 'Located in triangle B 2 B 2 'Pb, it means ∠

[0086] B 1 PbB 1 'Small than ∠B 2 PbB 2 ', that is, the third length ratio is less than the fourth length ratio, such as Figure 8B As shown. Specifically, compared with the line connecting the two end points of the second side, the second side protrudes upward. As a result, in the second characteristic line segment Lb, the farther away from the second projection, the more drastic the change in the length of the second characteristic line segment Lb, and the greater the increase, so that the farther the first projection 111b' is from the center of the second projection, the greater the increase in size, and thus the center of the first projection 111b' is farther from the center of the second projection, and the pressure relief hole 111b is farther from the sound outlet hole 111a, so as to avoid acoustic short circuit.

[0087] In some embodiments, the farther the pressure relief hole 111b is from the sound outlet hole 111a, the greater the increase in size, so that the center of the pressure relief hole 111b is farther from the sound outlet hole 111a, ensuring that the pressure relief hole 111b is farther from the sound outlet hole 111a, and avoiding acoustic short circuit. In some embodiments, the closer the pressure relief hole 111b is to the sound outlet hole 111a, the smaller the size reduction is or the size is reduced linearly, so that the pressure relief hole 111b has a larger area, ensuring that the pressure relief hole 111b has sufficient air permeability.

[0088] In some embodiments, Figure 4A and Figure 4B As shown, compared with the connecting end CE, the sound outlet hole 111a can be arranged closer to the free end FE, so that when worn, the sound outlet hole 111a is closer to the user's external auditory canal, so that the sound output from the front side of the diaphragm 113 of the sound-emitting part 111 can be better transmitted to the user's ear canal, thereby improving the user's listening volume.

[0089] In some embodiments, Fig. 6A As shown, in the long axis direction Y', the first reference point A 1 Compared to the second reference point A 2 Closer to the center point H of the projection of the free end FE on the reference plane S 1 In some embodiments, Figure 6B As shown, in the long axis direction Y', the third reference point B 1 Compared to the fourth reference point B 2 Closer to the center point H of the projection of the free end FE on the reference plane S 1 . That is, the end of the first projection 111b' that is closer to the free end FE has a smaller size, and the end of the projection that is farther away from the free end FE has a larger size; correspondingly, the effective air permeable port of the pressure relief hole 111b is narrower in size near the free end FE, and wider in size away from the free end FE. Since the sound outlet hole 111a is closer to the free end FE relative to the connection end CE, the effective air permeable port of the pressure relief hole 111b is farther away from the sound outlet hole 111a, while ensuring that the pressure relief hole 111b has sufficient air permeability. Among them, the distance from the reference point of the first projection 111b' (for example, reference point A, reference point B) to the center of the projection of the free end FE can also be equivalently replaced by the distance from the reference point of the first projection 111b' (for example, reference point A, reference point B) to the center (for example, centroid) of the free end FE. In some embodiments, when the free end FE is a plane, the projection of the free end FE on the reference plane S is a straight line segment, and the center point H 1 In some embodiments, when the free end FE is a curved surface, the projection of the free end FE on the reference plane S is an arc segment, and the center point H 1It can be the midpoint of the arc segment, or the point on the arc segment that is farthest from the line connecting the two ends of the arc segment. Specifically, in the long axis direction Y', the center point H of the projection from the reference point to the free end FE on the reference plane S is 1 The distance can be the distance from the reference point to the center point H 1 The distance from the straight line perpendicular to the major axis direction Y'.

[0090] In some embodiments, the first reference point A 1 and the center point H of the projection of the free end FE on the reference plane S 1 The distance in the long axis direction Y' is the fifth characteristic length, and the first sub-segment La 1 The ratio of the first length to the fifth characteristic length is the fifth length ratio. Since the first side is parallel to the long axis direction Y' and the first characteristic line segment La is perpendicular to the inner side surface IS, the first characteristic line segment La is perpendicular to the first side. Specifically, the point H 1 Draw a straight line L perpendicular to the long axis direction Y' 1 , first reference point A 1 To point H 1 The distance in the long axis direction Y' may refer to the first reference point A 1 To the straight line L 1 The distance, and the first reference point A 1 To the straight line L 1 The distance between the first sub-segment La 1 The other end point A 1 'To straight line L 1 For example, you can pass through the first reference point A 1 Draw a straight line L 1 The perpendicular line to the straight line L 1 Intersection at point J 1 , line segment A 1 J 1 The length of the first reference point A 1 To the straight line L 1 The distance between 1 'Draw a straight line L 1 The perpendicular line to the straight line L 1 Intersection at point J 1 ', line segment A 1 'J 1 ' is the length of endpoint A 1 'To straight line L 1 The distance between points J 1 ' is the first side and the straight line L 1 At this time, A 1 'J 1 ' and the length of line segment A 1 J 1The lengths of line segment A are equal. 1 'J 1 The length of ' can also be regarded as the fifth characteristic length. 1 With the first sub-segment La 1 The two endpoints (the first reference point A 1 , endpoint A 1 ') in the triangle A 1 J 1 A 1 ', click J 1 The corresponding angle (i.e. ∠A 1 J 1 A 1 ') of tan∠A 1 J 1 A 1 'The value is the fifth length ratio; similarly, point J 1 'The corresponding angle ∠A 1 J 1 'A 1 'tan∠A 1 J 1 'A 1 'The value can also be the fifth length ratio.

[0091] Similarly, the second reference point A 2 To the straight line L 1 The distance from point A 2 'To straight line L 1 The distances are equal. Through the second reference point A 2 Draw a straight line L 1 The perpendicular line to the straight line L 1 Intersection at point J 2 , line segment A 2 J 2 The length of the second reference point A 2 To the straight line L 1 Since the first side is parallel to the long axis direction Y', point J 2 , point A 1 ', point A 2 'Collinear, so line segment A 2 'J 1 ' and the length of line segment A 2 J 2 The lengths of line segment A are equal. 2 J 2 or line segment A 2 'J 1 The length of ' can be regarded as the sixth characteristic length. 2 With the second sub-segment La 2 The two endpoints (the second reference point A 2 , endpoint A 2') in the triangle A 2 J 2 A 2 ', click J 2 The corresponding angle (i.e. ∠A 2 J 2 A 2 ') of tan∠A 2 J 2 A 2 ' is the sixth length ratio, similarly, point J 1 'The corresponding angle ∠A 2 J 1 'A 2 'tan∠A 2 J 1 'A 2 'The value can also be the sixth length ratio.

[0092] In some embodiments, Fig. 6A or Fig. 8A As shown, the fifth length ratio is smaller than the sixth length ratio. Thus, in the first characteristic line segment La, the distance from the center point H of the projection of the free end FE is 1 The farther away, the faster the length of the first characteristic line segment La increases, so that the farther the first projection 111b' is from the projection of the free end FE, the greater the increase in size. In other words, the effective air permeable port of the pressure relief hole 111b is farther from the sound outlet hole 111a, so as to avoid the occurrence of acoustic short circuit. 1 The distance is the distance between the reference point A of the first characteristic line segment La and the center point H of the projection of the free end FE. 1 The distance in the long axis direction Y'.

[0093] In some embodiments, the fifth length ratio may be equal to the sixth length ratio, in which case the second side may be a straight line segment pointing to the first side and the straight line L. 1 The vertical point J 1 In some embodiments, the fifth length ratio may be greater than the sixth length ratio. Thus, the size of the portion of the first projection 111b' close to the free end is larger, ensuring that the pressure relief hole 111b has sufficient air permeability.

[0094] In some embodiments, the third reference point B 1 and the center point H of the projection of the free end FE on the reference plane S 1 The distance in the long axis direction Y' is the seventh characteristic length, and the third sub-line segment Lb 1The ratio of the third length to the seventh characteristic length is the seventh length ratio. Since the first side is parallel to the long axis direction Y' and the second characteristic line segment Lb is perpendicular to the inner side surface IS, the second characteristic line segment Lb is perpendicular to the first side. In some embodiments, the point H 1 Draw a straight line L perpendicular to the long axis direction Y' 1 , the third reference point B 1 To point H 1 The distance in the long axis direction Y' may refer to the third reference point B 1 To the straight line L 1 For example, the third sub-segment Lb 1 The third reference point B 1 Draw a straight line L 1 The perpendicular line to the straight line L 1 Intersection at point J 3 , line segment B 1 J 3 The length of the third reference point B 1 To the straight line L 1 The distance between line segment B 1 J 3 The length is the seventh characteristic length. 3 With the third sub-segment Lb 1 The two endpoints (third reference point B 1 , endpoint B 1 ') in the triangle formed by B 1 J 3 B 1 ', click J 3 The corresponding angle ∠B 1 J 3 B 1 'tan∠B 1 J 3 B 1 ' value is the seventh length ratio. In some embodiments, the fourth reference point B 2 and the center point H of the projection of the free end FE on the reference plane S 1 The distance in the long axis direction Y' is the eighth characteristic length. Since the first side is parallel to the long axis direction Y', point J 3 , the third reference point B 1 , Fourth reference point B 2 Collinear (i.e. point J 3 , Point B 1 , Point B 2 are both on the first side), so line segment B 2 J 3 The length is the eighth characteristic length. 3 With the fourth sub-segment Lb 2 The two endpoints (the fourth reference point B2 , endpoint B 2 ') in the triangle formed by B 2 J 3 B 2 ', click J 3 The corresponding ∠B 2 J 3 B 2 'tan∠B 2 J 3 B 2 'The value is the eighth length ratio.

[0095] In some embodiments, Figure 6B or Figure 8B As shown, the seventh length ratio is smaller than the eighth length ratio. Thus, in the second characteristic line segment Lb, the distance from the center point H of the projection of the free end FE is 1 The farther away, the faster the length of the second characteristic line segment Lb increases, so that the farther the first projection 111b' is from the projection of the free end FE, the greater the increase in size. In other words, the effective air permeable port of the pressure relief hole 111b is farther from the sound outlet hole 111a, so as to avoid the occurrence of acoustic short circuit. 1 The distance is the distance between the reference point B of the second characteristic line segment Lb and the center point H of the projection of the free end FE. 1 The distance in the long axis direction Y'.

[0096] In some embodiments, the seventh length ratio may be equal to the eighth length ratio, in which case the second side may be a straight line segment pointing to the first side and the straight line L. 1 The vertical point J 1 In some embodiments, the seventh length ratio may be greater than the eighth length ratio. Thus, the size of the portion of the first projection 111b' close to the free end is larger, ensuring that the pressure relief hole 111b has sufficient air permeability.

[0097] In some embodiments, the farther the pressure relief hole 111b is from the free end FE, the greater its size increases, so that the centroid of the pressure relief hole 111b is farther from the sound outlet hole 111a, ensuring that the pressure relief hole 111b is farther from the sound outlet hole 111a to minimize acoustic short circuit.

[0098] In some embodiments, in the long axis direction Y', the first projection 111b' has two endpoints that are farthest apart (eg, Fig. 6A and Figure 6B Point Qb shown 1 With point Qb 2 ), the midpoint of the two farthest endpoints in the first characteristic line segment Lb (i.e. point Qb 1With point Qb 2 The midpoint Qb of the line 3 ) divides the first projection 111b' into two parts, for example Fig. 6A Passing point Qb 3 The first projection 111b' is closer to the second projection (for example, the center point M of the second projection). 1 ) has a first area and is farther from the second projection (for example, the center point M of the second projection). 1 ) has a second area. In some embodiments, the first area may be smaller than the second area. In other words, the ratio of the first area to the second area may be less than 1, so that the size of the portion of the first projection 111b' closer to the second projection is smaller, and the size of the portion of the first projection 111b' farther from the second projection is larger. In other words, the effective air permeability port of the pressure relief hole 111b is narrower at the portion close to the sound outlet hole 111a and wider at the portion away from the sound outlet hole 111a, thereby making the effective air permeability port of the pressure relief hole 111b as far away from the sound outlet hole 111a as possible while ensuring that the pressure relief hole 111b has sufficient air permeability.

[0099] If the ratio of the first area to the second area is too small, it may be that the first area is too small or the second area is too large. When the first area is too small, the effective air permeable port of the pressure relief hole 111b may form a sharper angle near the sound outlet 111a, which may lead to the reflection of the sound with a shorter wavelength and introduce noise, affecting the output performance of the acoustic device 10; if the second area is too large, it may cause the size of the sound-emitting part 11 to be too large, affecting the wearing comfort of the acoustic device 10. If the ratio of the first area to the second area is too large, it may be that the first area is too large or the second area is too small, causing the centroid of the pressure relief hole 111b to be closer to the sound outlet 111a, causing an acoustic short circuit.

[0100] In some embodiments, in order to improve the output performance and wearing comfort of the acoustic device 10 and avoid the acoustic short circuit phenomenon, the ratio of the first area to the second area can be 0.5-0.99. In some embodiments, in order to further improve the output performance and wearing comfort of the acoustic device 10, the ratio of the first area to the second area can be 0.55-0.96. In some embodiments, in order to further avoid the acoustic short circuit phenomenon, the ratio of the first area to the second area can be 0.45-0.7.

[0101] In some embodiments, the effective air permeable port of the pressure relief hole 111b may have two endpoints that are farthest apart in the long axis direction Y, and a line segment passing through the midpoint of the two endpoints and perpendicular to the inner side surface IS divides the effective air permeable port into two parts. In the aforementioned two parts, the area of ​​the region enclosed by the portion closer to the sound outlet hole 111a is smaller than the area of ​​the region enclosed by the portion farther away from the sound outlet hole 111a, so that the size of the portion of the effective air permeable port of the pressure relief hole 111b closer to the sound outlet hole 111a is smaller, and the size of the portion farther away from the sound outlet hole 111a is larger, thereby ensuring that the effective air permeable port of the pressure relief hole 111b is farther away from the sound outlet hole 111a while ensuring that the pressure relief hole 111b has sufficient air permeability.

[0102] In order to improve the output performance and wearing comfort of the acoustic device 10 and avoid acoustic short circuit, the ratio of the area of ​​the area enclosed by the part of the effective air permeable port of the pressure relief hole 111b closer to the sound outlet hole 111a to the area of ​​the area enclosed by the part farther away from the sound outlet hole 111a can be 0.5-0.99.

[0103] In some embodiments, if the size of the first projection 111b' in the long axis direction Y' is too small, the area of ​​the effective air permeable port of the pressure relief hole 111b may be too small, so that the resonant frequency of the rear cavity on the rear side of the diaphragm 113 connected to the pressure relief hole 111b is small, affecting the output performance of the acoustic device 10. At the same time, the small area of ​​the effective air permeable port of the pressure relief hole 111b may also lead to insufficient air permeability of the pressure relief hole 111b, which may easily generate standing waves and affect the output performance of the acoustic device 10. If the size of the first projection 111b' in the long axis direction Y' is too large, the effective air permeable port of the pressure relief hole 111b may be too narrow and long, resulting in a large acoustic resistance at the effective air permeable port of the pressure relief hole 111b, so that the resonant frequency of the rear cavity on the rear side of the diaphragm 113 connected to the pressure relief hole 111b is small, affecting the output performance of the acoustic device 10; at the same time, if the size of the first projection 111b' in the long axis direction Y is too large, the size of the sound-emitting part 11 may be too large, affecting the wearing comfort of the acoustic device 10. The size of the first projection 111b' in the long axis direction Y' may refer to the aforementioned point Qb 1 With point Qb 2 Alternatively, it may refer to the distance between the first projection 111b' and the second projection (eg, the center M of the second projection) in the long axis direction Y'. 1) is the length of the line connecting the two closest and farthest points. In some embodiments, in order to improve the output performance and wearing comfort of the acoustic device 10, the distance between the two farthest endpoints of the first projection 111b' in the long axis direction Y' can be 4mm-6mm, that is, the size of the first projection 111b' in the long axis direction Y' can be 4mm-6mm. In some embodiments, in order to further improve the output performance and wearing comfort of the acoustic device 10, the size of the first projection 111b' in the long axis direction Y' can be 4.3mm-5.5mm.

[0104] In some embodiments, in order to improve the output performance and wearing comfort of the acoustic device 10, the size of the effective air permeable port of the pressure relief hole 111b in the long axis direction Y may be 4 mm-6 mm. The size of the pressure relief hole 111b in the long axis direction Y may refer to the length of the line connecting the two farthest end points of the effective air permeable port of the pressure relief hole 111b in the long axis direction Y.

[0105] Please refer to Figures 4A-8B In some embodiments, the pressure relief hole 111b may include a first pressure relief hole 111b-1 disposed on the upper side US. It should be noted that when the first pressure relief hole 111b-1 is disposed in the edge or arc edge transition area where the upper side US intersects with other side surfaces (such as the inner side IS), the first pressure relief hole 111b-1 may also be considered to be located on the upper side US. In some embodiments, the distance between the first pressure relief hole 111b-1 and the sound outlet hole 111a may be 12mm-15mm. In some embodiments, in order to further avoid acoustic short circuits, the distance between the first pressure relief hole 111b-1 and the sound outlet hole 111a may be 12.5mm-13.5mm. Exemplarily, the distance between the first pressure relief hole 111b-1 and the sound outlet hole 111a may be 12.8mm, 13mm, 14mm or 14.5mm.

[0106] In some embodiments, the effective vent port of the first pressure relief hole 111b-1 is on the reference plane S (eg, the first reference plane S 1 ) can have a length of 0.5 mm to 1.6 mm for the first characteristic line segment La or the second characteristic line segment Lb of the projection 111 b-1' of the first pressure relief hole 111 b-1. 1 The angle θ between the second side edge and the first side edge of the projection 111b-1′ 1 The effective air permeability port of the first pressure relief hole 111b-1 is located at the first reference plane S 1 The angle θ between the second side edge and the first side edge of the projection 111b-1′ 1In some embodiments, the effective air permeability port of the first pressure relief hole 111b-1 is located at the first reference plane S 1 The ratio of the first area to the second area of ​​the projection 111b-1' may be 0.5-0.7. 1 The ratio of the first area to the second area of ​​the projection 111b-1' may be 0.6. In some embodiments, the distance between the two farthest endpoints of the projection 111b-1' in the long axis direction Y' may be 5mm-6mm, that is, the first pressure relief hole 111b-1 is located at the first reference plane S of the effective vent port. 1 The projection 111b-1' of the first pressure relief hole 111b-1 may have a size of 5mm-6mm in the long axis direction Y'. 1 The size of the projection 111b-1' in the long axis direction Y' may be 5.5 mm.

[0107] In some embodiments, the size of the effective air permeable port of the first pressure relief hole 111b-1 in the thickness direction X of the sound-emitting portion 11 may be 0.5mm-1.6mm. In some embodiments, the ratio of the area of ​​the region enclosed by the portion of the effective air permeable port of the first pressure relief hole 111b-1 closer to the sound outlet hole 111a to the area of ​​the region enclosed by the portion farther from the sound outlet hole 111a may be 0.5-0.7. In some embodiments, the size of the effective air permeable port of the first pressure relief hole 111b-1 in the long axis direction Y may be 5mm-6mm.

[0108] In some embodiments, the pressure relief hole 111b may further include a second pressure relief hole 111b-2 disposed on the lower side LS of the housing 111. Figure 4A and Figure 4B As shown, the second pressure relief hole 111b-2 is configured to guide the sound generated by the rear side of the diaphragm 113 out of the housing 111. It should be noted that when the second pressure relief hole 111b-2 is arranged in the edge or arc edge transition area where the lower side surface LS intersects with other side surfaces (such as the inner side surface IS), the second pressure relief hole 111b-2 can also be considered to be located on the lower side surface LS. In some embodiments, the pressure relief hole 111b can include only one of the first pressure relief hole 111b-1 or the second pressure relief hole 111b-2, or can include both the first pressure relief hole 111b-1 and the second pressure relief hole 111b-2.

[0109] Fig. 9 is an exemplary structural diagram of a second pressure relief hole according to some embodiments of this specification, Fig. 10A and Fig. 10B It is a schematic diagram of the positions of different reference points shown in some embodiments of this specification.

[0110] In some embodiments, in order to avoid acoustic short circuit, the effective air permeable port of the second pressure relief hole 111b-2 needs to be far away from the sound outlet hole 111a, and the distance between the effective air permeable port of the second pressure relief hole 111b-2 and the sound outlet hole 111a can be 15mm-20mm. In some embodiments, in order to further avoid acoustic short circuit, the distance between the effective air permeable port of the second pressure relief hole 111b-2 and the sound outlet hole 111a can be 16mm-18mm. Exemplarily, the distance between the effective air permeable port of the second pressure relief hole 111b-2 and the sound outlet hole 111a can be 17mm.

[0111] In some embodiments, when the pressure relief hole 111b includes both the first pressure relief hole 111b-1 and the second pressure relief hole 111b-2, the distance between the effective air port of the first pressure relief hole 111b-1 and the sound outlet hole 111a may be smaller than the distance between the effective air port of the second pressure relief hole 111b-2 and the sound outlet hole 111a. The distance between the effective air port of the first pressure relief hole 111b-1 and the sound outlet hole 111a may refer to the distance between the center point B of the effective air port of the first pressure relief hole 111b-1 and the center point M of the sound outlet hole 111a; the distance between the effective air port of the second pressure relief hole 111b-2 and the sound outlet hole 111a may refer to the distance between the center point C of the effective air port of the second pressure relief hole 111b-2 and the center point M of the sound outlet hole 111a, such as Figure 4A and Figure 4B shown.

[0112] Please refer to Fig. 9 , Fig. 10A and Fig. 10B In some embodiments, the reference plane S of the first pressure relief hole 111b-1 (eg, the first reference plane S 1 ) and the reference plane S (for example, the second reference plane S 2 ) may be the same or different. Specifically, the second reference plane S of the second pressure relief hole 111b-2 2 The second reference plane S may be parallel to or tangent to the side where the effective air permeable port of the second pressure relief hole 111b-2 is located. For example, the second pressure relief hole 111b-2 is arranged on the lower side LS. When the lower side LS is a plane, the second reference plane S 2 It can be parallel to the lower side surface LS, or the plane where the lower side surface LS is located is the second reference plane S 2 ; When the lower side surface LS is a curved surface, the second reference plane S 2 The second reference plane S may be tangent to the lower side surface LS. 2 In some embodiments, the first reference plane S of the first pressure relief hole 111b-2 may be perpendicular to the inner side surface IS.1 The second reference plane S of the second pressure relief hole 111b-2 2 In some embodiments, the first reference plane S 1 With the second reference plane S 2 Can be the same plane.

[0113] In some embodiments, the effective vent port of the second pressure relief hole 111b-2 is on the reference plane S (eg, the second reference plane S 2 ) The length of the first characteristic line segment La or the second characteristic line segment Lb of the projection 111b-2' of the second pressure relief hole 111b-2 may be 1 mm to 1.6 mm. In some embodiments, the effective air permeable port of the second pressure relief hole 111b-2 is located on the second reference plane S 2 The angle θ between the second side edge and the first side edge of the projection 111b-2' 2 The angle may be 0°-60°. For example, the effective air permeability port of the second pressure relief hole 111b-2 is located at the second reference plane S 2 The angle θ between the second side edge and the first side edge of the projection 111b-2' 1 ' can be 35°. In some embodiments, the effective air permeability port of the second pressure relief hole 111b-2 is at the second reference plane S 2 The ratio of the first area to the second area of ​​the projection 111b-2' may be 0.7-0.99. 2 The ratio of the first area to the second area of ​​the projection 111b-2' may be 0.9. In some embodiments, the distance between the two farthest endpoints of the projection 111b-2' in the long axis direction Y' may be 4mm-5mm, that is, the effective air permeable port of the second pressure relief hole 111b-2 is located on the second reference plane S 2 The size of the projection 111b-2' in the long axis direction Y' may be 4mm-5mm. 2 The size of the projection 111b-2' in the long axis direction Y' may be 4.5 mm.

[0114] In some embodiments, the size of the effective air permeable port of the second pressure relief hole 111b-2 in the thickness direction X of the sound-emitting portion 11 may be 1mm-1.6mm. In some embodiments, the ratio of the area of ​​the region enclosed by the portion of the effective air permeable port of the second pressure relief hole 111b-2 closer to the sound outlet hole 111a to the area of ​​the region enclosed by the portion farther from the sound outlet hole 111a may be 0.7-0.99. In some embodiments, the size of the effective air permeable port of the second pressure relief hole 111b-2 in the long axis direction Y may be 4mm-5mm.

[0115] Please refer to Figure 4A and Figure 4B , since the second pressure relief hole 111b-2 itself can be arranged at a position farther from the sound outlet hole 111a than the first pressure relief hole 111b-1, in the effective air permeable port of the second pressure relief hole 111b-2, the relative size relationship between the area of ​​the region enclosed by the portion closer to the sound outlet hole 111a and the area of ​​the region enclosed by the portion farther away from the sound outlet hole 111a has little effect on the distance between the center of the effective air permeable port of the second pressure relief hole 111b-2 and the sound outlet hole 111a, and the possibility of an acoustic short circuit between the second pressure relief hole 111b-2 and the sound outlet hole 111a is less than the possibility of an acoustic short circuit between the first pressure relief hole 111b-1 and the sound outlet hole 111a. In some embodiments, the ratio of the first area to the second area of ​​the projection 111b-1' is a first area ratio, and the ratio of the first area to the second area of ​​the projection 111b-2' is a second area ratio, and the first area ratio can be less than the second area ratio. Correspondingly, the ratio of the first area to the second area of ​​the effective air permeable port of the first pressure relief hole 111b-1 may be smaller than the ratio of the first area to the second area of ​​the effective air permeable port of the second pressure relief hole 111b-2. In some embodiments, the ratio of the first area to the second area of ​​the effective air permeable port of the second pressure relief hole 111b-2 may be greater than, less than, or equal to 1; that is, in the effective air permeable port of the second pressure relief hole 111b-2, the area of ​​the area enclosed by the portion closer to the sound outlet hole 111a may also be greater than, less than, or equal to the area of ​​the area enclosed by the portion farther away from the sound outlet hole 111a.

[0116] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only for example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0117] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0118] Similarly, it should be noted that in order to simplify the description disclosed in this application and thus help understand one or more embodiments, in the above description of the embodiments of this application, multiple features are sometimes combined into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0119] In some embodiments, the numerical parameters used in the specification and claims are approximate values, which may vary according to the characteristics required for individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the method of general digit retention. Although the numerical domains and parameters used to confirm the breadth of the range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0120] Finally, it should be understood that the embodiments described in this application are only used to illustrate the principles of the embodiments of the present application. Other variations may also fall within the scope of the present application. Therefore, as an example and not a limitation, the alternative configurations of the embodiments of the present application may be considered to be consistent with the teachings of the present application. Accordingly, the embodiments of the present application are not limited to the embodiments explicitly introduced and described in the present application.

Claims

1. An acoustic device, characterized in that: include: A sound-generating part, comprising a housing and a diaphragm accommodated in the housing, wherein the diaphragm is configured to generate sound by vibrating; The suspension structure is configured to place the sound-emitting part near the ear canal of the user without blocking the ear canal, wherein: In the wearing state, the shell is provided with a sound outlet hole on the inner side facing the user's auricle, and the sound outlet hole is configured to guide the sound generated by the front side of the diaphragm out of the shell; the shell is provided with a pressure relief hole on the other side except the inner side, and the pressure relief hole is configured to guide the sound generated by the rear side of the diaphragm out of the shell; wherein, The pressure relief hole includes an effective vent port, the effective vent port has a first projection on a reference plane, the reference plane is parallel to or tangent to the side where the effective vent port is located, the reference plane is perpendicular to the inner side surface, the first projection defines a plurality of first characteristic line segments that are perpendicular to the inner side surface and parallel to each other and both ends of which are located at the contour of the first projection, the sound outlet hole has a second projection on the reference plane, and one of the two endpoints of any of the first characteristic line segments that is farther from the second projection is a reference point, The multiple reference points include a first reference point and a second reference point, the distance from any of the first reference points to the second projection is smaller than the distance from any of the second reference points to the second projection, the multiple first feature line segments include a first sub-line segment passing through the first reference point and a second sub-line segment passing through the second reference point, the first sub-line segment has a first length, the second sub-line segment has a second length, and the first length is smaller than the second length.

2. The acoustic device according to claim 1, characterized in that The projection of the sound-emitting part on the reference plane has a long axis direction, the first projection includes a first side parallel to the long axis direction and a second side arranged opposite to the first side, and the first reference point and the second reference point are both located on the second side.

3. The acoustic device according to claim 2, characterized in that The included angle between the second side edge and the first side edge is 0°-60°.

4. The acoustic device according to claim 1, characterized in that As the distance from the reference point of the first characteristic line segment to the second projection increases, the length of the first characteristic line segment also increases accordingly.

5. The acoustic device according to claim 2 or 4, characterized in that: The length of the first characteristic line segment is 0.5 mm-1.6 mm.

6. The acoustic device according to claim 5, characterized in that The pressure relief hole includes a first pressure relief hole, the first pressure relief hole is located on the upper side of the shell, and the length of the first characteristic line segment corresponding to the first pressure relief hole is 0.5mm-1.6mm.

7. The acoustic device according to claim 5, characterized in that The pressure relief hole includes a second pressure relief hole, the second pressure relief hole is located on the lower side of the shell, and the length of the first characteristic line segment corresponding to the second pressure relief hole is 1mm-1.6mm.

8. The acoustic device according to claim 1, characterized in that The shell includes a connection end connected to the suspension structure and a free end away from the connection end. Compared with the connection end, the sound outlet is closer to the free end.

9. The acoustic device according to claim 8, characterized in that The projection of the sound-emitting portion on the reference plane has a long-axis direction, and in the long-axis direction, the first reference point is closer to the center of the projection of the free end on the reference plane than the second reference point.

10. The acoustic device according to claim 1, characterized in that The projection of the sound-emitting part on the reference plane has a long axis direction, and in the long axis direction, the first projection has two endpoints that are farthest apart, and the line segment in the first characteristic line segment that passes through the midpoints of the two endpoints divides the first projection into two parts, wherein an area enclosed by the part close to the second projection has a first area, and an area enclosed by the other part far from the second projection has a second area, and the first area is smaller than the second area.

11. The acoustic device according to claim 1, characterized in that The projection of the sound-emitting part on the reference plane has a long axis direction. In the long axis direction, the first projection has two endpoints that are farthest apart, and the distance between the two endpoints is 4 mm-6 mm.

12. An acoustic device, characterized in that: include: A sound-generating part, comprising a housing and a diaphragm accommodated in the housing, wherein the diaphragm is configured to generate sound by vibrating; The suspension structure is configured to place the sound-emitting part near the ear canal of the user without blocking the ear canal, wherein: In the wearing state, the shell is provided with a sound outlet hole on the inner side facing the user's auricle, and the sound outlet hole is configured to guide the sound generated by the front side of the diaphragm out of the shell; the shell is provided with a pressure relief hole on the other side except the inner side, and the pressure relief hole is configured to guide the sound generated by the rear side of the diaphragm out of the shell; wherein, The pressure relief hole includes an effective vent port, the effective vent port has a first projection on a reference plane, the reference plane is parallel to or tangent to the side where the effective vent port is located, the first projection defines a plurality of second characteristic line segments that are perpendicular to the inner side surface and both ends of which are located at the contour of the first projection and parallel to each other, the sound outlet hole has a second projection on the reference plane, and one of the two endpoints of any second characteristic line segment that is closer to the center of the second projection is another reference point, The multiple other reference points include a third reference point and a fourth reference point, the distance from any of the third reference points to the center of the second projection is smaller than the distance from any of the fourth reference points to the center of the second projection, the multiple second characteristic line segments include a third sub-line segment passing through the third reference point and a fourth sub-line segment passing through the fourth reference point, the third sub-line segment has a third length, the fourth sub-line segment has a fourth length, and the third length is smaller than the fourth length.

13. The acoustic device according to claim 12, characterized in that The projection of the sound-emitting part on the reference plane has a long-axis direction, and in the long-axis direction, the third reference point and the fourth reference point are located on the same side of the second projection.

14. The acoustic device according to claim 12, characterized in that The projection of the sound-emitting part on the reference plane has a long axis direction, the first projection includes a first side parallel to the long axis direction and a second side arranged opposite to the first side, and the third reference point and the fourth reference point are both located on the first side.

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