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] This specification relates to the field of acoustic technology, and in particular to an acoustic device. Background Technology

[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. Acoustic devices typically include a sound outlet to output sound from the front of the diaphragm, and a pressure relief outlet to output sound from the rear of the diaphragm. The design of the pressure relief outlet has a significant impact on the output performance of headphones.

[0003] Therefore, it is necessary to propose an acoustic device that improves the output performance of the acoustic device by designing the pressure relief hole. Summary of the Invention

[0004] One embodiment of this specification provides an acoustic device, including: a sound-generating part, comprising a housing and a diaphragm housed within the housing, the diaphragm vibrating to generate sound; a suspension structure configured to place the sound-generating part near a user's ear canal without blocking the ear canal, wherein, in the wearing state, the inner side of the housing facing the user's auricle has a sound outlet, the sound outlet being configured to exhaust sound generated on the front side of the diaphragm through the housing; pressure relief holes are provided on the other sides of the housing besides the inner side, the pressure relief holes being configured to exhaust sound generated on the rear side of the diaphragm through the housing; wherein the pressure relief hole includes an effective ventilation port, the effective ventilation port having a first projection on a reference plane, the reference plane being parallel to or... Tangent to each other, with the reference plane perpendicular to the inner surface, the first projection defines multiple parallel first feature lines perpendicular to the inner surface and with both ends located on the contour of the first projection. The sound outlet has a second projection on the reference plane. The endpoint of any first feature line segment farther from the second projection is designated as a reference point. These reference points include both a first reference point and a 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 multiple first feature lines include a first sub-segment passing through the first reference point and a second sub-segment passing through the second reference point. The first sub-segment has a first length, and the second sub-segment has a second length, with the first length being less than the second length. That is, on the first projection, the portion farther from the second projection has a larger size, and the portion closer to the second projection has a smaller size. This ensures that the center of the first projection is as far away from the second projection as possible while simultaneously giving the first projection a larger area, thus avoiding acoustic short circuits and ensuring sufficient air permeability of the pressure relief hole.

[0005] In some embodiments, the projection of the sound-emitting part onto the reference plane has a major axis direction. The first projection includes a first side parallel to the major axis direction and a second side opposite to the first side. Both the first reference point and the second reference point are located on the second side. By placing both the first reference point and the second reference point on the second side, it is easier to limit the distance from the first reference point to the line segment shown in the second projection and the distance from the second reference point to the line segment shown in the second projection, thereby facilitating the delineation 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 vent port of the pressure relief hole, and thus 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 aforementioned 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 feature segment to the second projection increases, the length of the first feature segment also increases accordingly. That is, the portion of the first projection farther from the second projection has a larger size, which in turn makes the centroid of the first projection farther from the second projection, thereby making the pressure relief hole farther from the sound outlet hole and avoiding acoustic short circuit.

[0008] In some embodiments, the length of the first feature line segment is 0.5mm-1.6mm, thereby giving the first projection a larger area, that is, giving the effective venting port of the pressure relief hole a larger area, ensuring that the pressure relief hole has sufficient venting capacity.

[0009] In some embodiments, the pressure relief hole includes a first pressure relief hole, which is located on the upper side of the housing, and the length of the first feature 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, which is located on the lower side of the housing, and the length of the first feature 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 housing includes a connecting end connected to the suspension structure and a free end away from the connecting end. The sound outlet is located closer to the free end than to the connecting end, so that when worn, the sound outlet is closer to the user's external ear canal, allowing the sound output from the front side of the diaphragm of the sound-producing part to be better transmitted to the user's ear canal, thereby increasing the user's listening volume.

[0012] In some embodiments, the projection of the sound-emitting part onto the reference plane has a major axis direction, and in this direction, the first reference point is closer to the center of the projection of the free end onto the reference plane than the second reference point. That is, the end of the first projection closer to the free end has a smaller dimension, and the end of the projection farther from the free end has a larger dimension; correspondingly, the effective venting port of the pressure relief hole has a narrower dimension near the free end and a wider dimension far from the free end. Because the sound outlet is closer to the free end relative to the connecting end, the effective venting port of the pressure relief hole is farther from the sound outlet while still ensuring sufficient air permeability.

[0013] In some embodiments, the projection of the sound-emitting part onto the reference plane has a major axis direction. Along this major axis direction, the first projection has two endpoints furthest apart. A line segment passing through the midpoint of these two endpoints divides the first projection into two parts. The region enclosed by the part closer to the second projection has a first area, and the region enclosed by the other part farther from the second projection has a second area. The first area is smaller than the second area. This results in a smaller size for the portion of the first projection closer to the second projection and a larger size for the portion farther from the second projection. In other words, the effective venting port of the pressure relief hole is narrower near the sound outlet and wider away from the sound outlet, thus ensuring sufficient air permeability of the pressure relief hole while keeping its effective venting port as far away from the sound outlet as possible.

[0014] In some embodiments, the projection of the sound-emitting part onto the reference plane has a long axis direction, and in the long axis direction, the first projection has two endpoints that are furthest apart, with a distance of 4mm-6mm between the two endpoints, 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] This specification also provides an acoustic device, comprising: a sound-generating part including a housing and a diaphragm housed within the housing, the diaphragm vibrating to generate sound; a suspension structure configured to place the sound-generating part near a user's ear canal without blocking the ear canal, wherein, in the wearing state, the inner side of the housing facing the user's auricle has a sound outlet, the sound outlet being configured to exhaust sound generated on the front side of the diaphragm through the housing; pressure relief holes are provided on the other sides of the housing besides the inner side, the pressure relief holes being configured to exhaust sound generated on the rear side of the diaphragm through the housing; wherein the pressure relief hole includes an effective ventilation port, the effective ventilation port having a first projection on a reference plane, the reference plane being parallel or tangent to the side where the effective ventilation port is located. The first projection defines multiple parallel second feature lines perpendicular to the inner surface and with both ends located on the outline of the first projection. The sound outlet has a second projection on the reference plane. The endpoint of any second feature line segment closer to the center of the second projection is designated as another reference point. These 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 multiple second feature lines include a third sub-segment passing through the third reference point and a fourth sub-segment passing through the fourth reference point. The third sub-segment has a third length, and the fourth sub-segment has a fourth length, with the third length being less than the fourth length. That is, on the first projection, the portion farther from the center point of the second projection has a larger size, and the portion closer to the center point of the second projection has a smaller size. This ensures that the center of the first projection is as far away from the center point of the second projection as possible while simultaneously giving the first projection a larger area, thus avoiding acoustic short circuits and ensuring sufficient air permeability for the first pressure relief hole.

[0016] In some embodiments, the projection of the sound-emitting part onto the reference plane has a major axis direction, and along this major axis direction, the third reference point and the fourth reference point are located on the same side of the second projection. This ensures that the center of the first projection is as far away as possible from the center point of the second projection, and consequently, that the pressure relief hole is as far away as possible from the sound outlet hole, thereby avoiding acoustic short circuits.

[0017] In some embodiments, the projection of the sound-emitting part onto the reference plane has a major axis direction. The first projection includes a first side parallel to the major axis direction and a second side opposite to the first side. 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 to be located on the first side, it is convenient to delineate the third sub-segment and the fourth sub-segment in the second feature line segment. Attached Figure Description

[0018] This specification will be further described by way of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting; in these embodiments, the same reference numerals denote the same structures, wherein:

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

[0020] Figure 2A These are exemplary structural diagrams of acoustic devices shown in some embodiments of this specification;

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

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

[0023] Figure 4A and Figure 4B These are schematic diagrams of different inner surfaces shown in this specification;

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

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

[0026] Figure 7 This is a schematic diagram of the frequency response curves of the acoustic device corresponding to the pressure relief hole when the second side and the first side are at different angles, as shown in some embodiments of this specification.

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

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

[0029] Figure 9 This is an exemplary structural diagram of the second pressure relief hole shown in some embodiments of this specification;

[0030] Figure 10A and Figure 10B These are schematic diagrams showing the positions of different reference points according to some embodiments of this specification. Detailed Implementation

[0031] To more clearly illustrate the technical solutions of the embodiments in this specification, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this specification. For those skilled in the art, these drawings can be applied to other similar scenarios without creative effort. Unless obvious from the context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0032] In acoustic devices, a sound outlet is typically designed to output sound from the front of the diaphragm, while a pressure relief outlet is designed to output sound from the rear of the diaphragm. The design of the sound outlet and pressure relief outlet allows the output sounds to cancel each other out in the far field, reducing sound leakage in the far field. Simultaneously, to prevent near-field cancellation of the sound from the sound outlet and pressure relief outlet, which could cause acoustic short-circuiting and affect the user's listening experience, the pressure relief outlet needs to be positioned as far away from the sound outlet as possible. Furthermore, to reduce the impact of standing waves, the pressure relief outlet needs a large opening area to ensure sufficient air permeability. To address these issues, this application designs the shape of the pressure relief outlet so that the portion near the sound outlet is narrower, while the portion further away is wider, thus avoiding acoustic short-circuiting while ensuring sufficient air permeability.

[0033] Figure 1 This is a schematic diagram of an exemplary ear according to some embodiments of this application. See also Figure 1The ear 100 may include an external auditory canal 101, a concha 102, a cymba conchae 103, a triangular fossa 104, an antihelix 105, a scaphoid fossa 106, a helix 107, an earlobe 108, and a crus of the helix 109. In some embodiments, the ear 100 may be used to wear and stabilize an acoustic device. In some embodiments, the external auditory canal 101, the concha 102, the cymba conchae 103, the triangular fossa 104, etc., have a certain depth and volume in three-dimensional space, which can be used to meet the wearing requirements of the acoustic device. For example, an acoustic device (e.g., an in-ear headphone) may be worn in the external auditory canal 101. In some embodiments, the ear 100 may be used to wear an acoustic device using other parts of the ear 100 besides the external auditory canal 101. For example, the cymba conchae 103, the triangular fossa 104, the antihelix 105, the scaphoid fossa 106, the helix 107, etc., or combinations thereof, may be used to wear an acoustic device. In some embodiments, to improve the comfort and reliability of the acoustic device during wear, it may be further utilized by the user's earlobe 108 or other parts of the ear. By utilizing 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," reducing the impact of the acoustic device on the user's ear health. When the user wears the acoustic device on the road, the acoustic device will not block the user's external auditory canal 101, and the user can receive both the sound from the acoustic device and the sound from the environment (e.g., horns, car bells, surrounding voices, traffic signals, etc.), thereby reducing the probability of traffic accidents. For example, when the user wears the acoustic device, the entire or part of the acoustic device structure may be located on the front side of the helix 109. For example, when a user wears an acoustic device, the entire or part of the acoustic device may come into contact with the upper part of the external auditory canal 101 (e.g., the location of one or more parts such as the crus of the helix 109, cymba conchae 103, triangular fossa 104, antihelix 105, scaphoid fossa 106, and helix 107). As another example, when a user wears an acoustic device, the entire or part of the acoustic device may be located within one or more parts of the ear (e.g., the cavum conchae 102, cymba conchae 103, triangular fossa 104, etc.).

[0034] Furthermore, individual differences may exist among different users, resulting in variations in the shape, size, and other dimensions of the ear. To facilitate description and reduce individual differences among users, a simulator containing the head and its (left and right) ears can be manufactured based on ANSI:S3.36,S3.25 and IEC:60318-7 standards, such as the GRAS 45BC KEMAR. Therefore, in this application, descriptions such as "worn by the user," "in a wearing state," and "under wearing condition" can refer to the acoustic device described in this application being worn on the ear of the aforementioned simulator. Of course, precisely because of individual differences among users, the structure, shape, size, thickness, etc., of one or more parts of the ear 100 may differ, and there may be certain differences when the acoustic device is worn by different users compared to when it is worn on the ear of the aforementioned simulator; however, such differences should be tolerable.

[0035] It should be noted that in medicine, anatomy, and other fields, the human body can be defined by three basic planes: the sagittal plane, the coronal plane, and the horizontal plane; and three basic axes: the sagittal axis, the coronal axis, and the vertical axis. The sagittal plane is a section perpendicular to the ground along the anteroposterior direction of the body, dividing the body into left and right parts. The coronal plane is a section perpendicular to the ground along the left-right direction of the body, dividing the body into anterior and posterior parts. The horizontal plane is a section parallel to the ground along the vertical direction of the body, dividing the body into superior and inferior parts. Correspondingly, the sagittal axis is the axis along the anteroposterior direction of the body and perpendicular to the coronal plane; the coronal axis is the axis along the left-right direction of the body and perpendicular to the sagittal plane; and the vertical axis is the axis along the vertical 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 "back side of the ear." The former refers to the side of the ear away from the head, while the latter refers to the side of the ear facing the head; both refer to the user's ear. Specifically, by observing the ear of the simulator along the direction of the human coronal axis, one can obtain... Figure 1 A schematic diagram of the front outline of the ear is shown.

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

[0037] Figure 2AThese are exemplary structural diagrams of acoustic devices shown in some embodiments of this specification. Figure 2B yes Figure 2A Another exemplary structural diagram of the acoustic device shown. Figure 3 This is a schematic diagram of the exemplary internal structure of the sound-generating part according to some embodiments of this specification. For example... Figure 2A and Figure 2B As shown, the acoustic device 10 may include a sound-emitting part 11 and a suspension structure 12. In some embodiments, the acoustic device 10 may be worn on a user's body (e.g., the head, neck, or upper torso) via the suspension structure 12.

[0038] In some embodiments, the suspension structure 12 may be an arc-shaped structure adapted to the user's auricle, so that the suspension structure 12 can 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 can 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 part 11, and the other end extends 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 and prevent the user from falling off during use.

[0039] like Figures 2A-3As shown, in some embodiments, the sound-generating part 11 can be worn on a user's body. The sound-generating part 11 may include a housing 111 and a diaphragm 113 housed within the housing 111. 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 displays, and AR / VR helmets. In this case, the sound-generating part 11 can be fixed near the user's ear 100 by suspension 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 annular, elliptical, polygonal (regular or irregular), U-shaped, V-shaped, semi-circular, etc., so that the sound-generating part 11 can be directly attached to the user's ear 100. In some embodiments, the sound-generating part 11 may have a major axis direction Y and a minor axis direction (i.e., the height or width direction) Z that are perpendicular to the thickness direction X and orthogonal to each other. In this embodiment, the major 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 when worn, and the minor 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 when worn. The thickness direction X can be consistent with the direction of the coronal axis, both pointing towards the left and right sides 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 when worn. In some embodiments, when the sound-emitting part 11 is in a horizontal state when worn, the major axis direction Y can be consistent with the direction of the sagittal axis, both pointing towards the front and back of the body, and the minor axis direction Z can be consistent with the direction of the vertical axis, both pointing towards the up and down of the body. In other embodiments, when the sound-emitting part 11 is in an inclined state when worn, the major axis direction Y and the minor axis direction Z remain parallel to the sagittal plane, but the major axis direction Y can have a certain angle with the direction of the sagittal axis, i.e., the major axis direction Y is also inclined accordingly, and the minor axis direction Z can have a certain angle with the direction of the vertical axis, i.e., the minor axis direction Z is also inclined.

[0040] In some embodiments, when a 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. The housing 111 of the sound-emitting part 11 may also have two or more acoustic holes for transmitting sound. In some embodiments, the speaker within the sound-emitting part 11 can output sound with a phase difference (e.g., opposite phase) through 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-back headphone, which does not obstruct the user's external auditory canal 101 when the acoustic device 10 is worn. In some embodiments, the projection of the acoustic device 10 onto the user's ear plane may partially or completely cover but not obstruct the user's external auditory canal 101. In other embodiments, the projection of the acoustic device 10 onto the user's ear plane may not cover the user's external auditory canal 101.

[0042] In some embodiments, the sound-generating part 11 may have a connecting end CE connected to the suspension structure 12 and a free end FE not connected to the suspension structure 12, with the free end FE disposed away from the connecting end CE. In some embodiments, the sound-generating part 11 may have an inner surface IS facing the ear and an outer surface OS facing away from the ear, disposed along the thickness direction X in the wearing state, and a connecting surface connecting the inner surface IS and the outer surface OS. Further, at least a portion of the aforementioned connecting surface is located within the concha cavity in the wearing state and forms a first contact area with the front side of the aforementioned ear region (e.g., the ear region corresponding to the concha cavity, the antihelix, etc.), and the suspension structure 12 forms a second contact area with the rear side of the aforementioned ear region in the wearing state. The aforementioned second contact area and the aforementioned first contact area at least partially overlap in the ear thickness direction of the aforementioned ear region. Thus, not only can the sound-generating part 11 and the suspension structure 12 jointly clamp the ear from both the front and rear sides, but the clamping force formed is mainly compressive stress, which is beneficial to improving the stability and comfort of the acoustic device 10 in the wearing state. When worn, viewed along the direction of the coronal axis (i.e., the thickness direction X), the sound-emitting part 11 (shell 111) can be configured as a circle, ellipse, rounded square, rounded rectangle, or other shapes. When the sound-emitting part 11 is configured as a circle or ellipse, the aforementioned connecting surface can refer to the arcuate side of the shell 111 of the sound-emitting part 11; while when the sound-emitting part 11 is configured as a rounded square or rounded rectangle, the aforementioned connecting surface can include the lower side LS, upper side US, and rear side RS mentioned later. In some embodiments, the connecting surface may also include an edge connecting the sides, for example, an arcuate edge connecting the upper side US and the inner side IS. Therefore, for ease of description, this embodiment uses a rounded rectangle configuration of the sound-emitting part 11 as an example for illustrative explanation. In some embodiments, the sound-generating part 11 may have an upper side US and a lower side LS disposed along the short axis direction Z, and a rear side RS connecting the upper side US and the lower side LS, wherein the upper side US is located at the end facing the top of the head along the short axis direction Z when worn, and the rear side RS is located at the end facing the back of the head along the long axis direction Y when worn, and at least a portion of the free end FE is located on the rear side RS. In some embodiments, as Figure 2AAs shown, the positive direction of the major axis Y can point to the connecting end CE, the positive direction of the minor axis Z can point to the upper side US, and the positive direction of the thickness X can point to the outer side OS.

[0043] Figure 4A and Figure 4B These are schematic diagrams of different inner surfaces shown in this specification. For example... Figure 2B and Figure 4A , Figure 4B As shown, in some embodiments, the inner surface IS of the housing 111 facing the ear in the wearing state is provided with a sound outlet 111a. 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 into the user's external auditory canal 101. In some embodiments, the shape of the sound outlet 111a can be circular, racetrack-shaped (e.g., Figure 2B As shown), U-shaped (as shown) Figure 4A (as shown) or L-shaped (such as) Figure 4B By designing the shape of the sound outlet 111a, the space of the inner side IS can be reasonably utilized so that the sound outlet 111a is closer to the external auditory canal when worn. At the same time, the resonant frequency of the front cavity on the front side of the diaphragm 133 connected to the sound outlet 111a can be adjusted, thereby improving the output performance of the acoustic device 10.

[0044] In some embodiments, the housing 111 has pressure relief holes (e.g., at least one of a first pressure relief hole and a second pressure relief hole) on other sides (e.g., the lower side LS, the upper side US, the outer side OS, the rear side RS, etc.) other than the inner side IS. The pressure relief holes are configured to discharge the sound generated on the rear side of the diaphragm 113 into the housing 111.

[0045] Figure 5 This is an exemplary structural diagram of a pressure relief orifice according to some embodiments of this specification. Figure 6A and Figure 6B This is a schematic projection of the sound-generating part on the first reference plane according to some embodiments of this specification.

[0046] In some embodiments, the pressure relief port 111b may include an effective ventilation port. Specifically, the diaphragm 113 can be connected to the housing 111 via the bracket 112, and the pressure relief port 111b (e.g., first pressure relief port 111b-1, second pressure relief port 111b-2, etc.) includes an outer port formed on the housing 111 and an inner port enclosed by the bracket 112 and the housing 111, such as... 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 ventilation port. In some embodiments, please refer to... Figure 3The outer port can refer to the port where the pressure relief hole 111b is located on the outside of the housing 111, i.e., the port where points O1 and O2 are located; the inner port can refer to the port where the pressure relief hole 111b is located on the inside of the housing 111 and the bracket 112, i.e., the port where points O3 and O4 are located. In some embodiments, please refer to Figure 5 and Figure 9 The external port refers to the racetrack-shaped port (e.g., the pressure relief hole 111b) located on the housing 111. Figure 5 and Figure 9 (The port shown is either in the shape of an outer runway or an inner runway); the inner port refers to the port of pressure relief vent 111b formed by the housing 111 and the support 112, for example... Figure 5 Zhongyu Figure 6A , Figure 6B The projection 111b-1' shown corresponds to the port shape formed by the inner racetrack shape and the support 112, or Figure 9 Zhongyu Figure 10A , Figure 10B The projection 111b-2' shown corresponds to the port formed by the inner raceway shape and the support 112.

[0047] In some embodiments, the distance between the pressure relief hole 111b and the sound outlet hole 111a can be 12mm-20mm to maintain a large distance between them, avoiding acoustic short circuits and preventing the sound-generating part 11 from becoming too large due to an excessively large distance, thus improving the wearing comfort of the acoustic device 10. In some embodiments, to further avoid acoustic short circuits and to avoid the sound-generating part 11 becoming too large, the distance between the pressure relief hole 111b and the sound outlet hole 111a can be 13mm-17mm. The distance between the pressure relief hole 111b and the sound outlet hole 111a can 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 can be the centroid of the outer end face of the sound outlet hole 111a. In some embodiments, the center point M of the sound outlet 111a can also be a selected point that meets design requirements. For example, when the shape of the sound outlet 111a is semi-circular, the center point M can be located at the point where the inner circle of the semi-circle intersects the axis of symmetry; or, for example, when the shape of the sound outlet 111a is L-shaped, the center point M can be a corner point. In some embodiments, the center point M of the sound outlet 111a can be the equivalent centroid of the outer end face of the sound outlet 111a, such as... Figure 4A or Figure 4B As shown.

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

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

[0050] In some embodiments, the sound outlet 111a has a second projection onto the reference plane S. In some embodiments, the reference plane S may be perpendicular to the inner surface IS. For example, when the pressure relief hole 111b is located on the upper surface US but not on the edge of the upper surface US, the second projection corresponding to the sound outlet 111a is a line segment, such as... Figure 6A and Figure 6B As shown. In some embodiments, the reference plane S may not be perpendicular to the inner surface IS (for example, when the pressure relief hole 111b is located at the edge where the upper surface US intersects the inner surface IS). In this case, the second projection corresponding to the sound outlet hole 111a is a closed geometric figure. For ease of description, the position of the second projection can be represented by the projection point M1 of the center point M of the sound outlet hole 111a onto the reference plane S; or, the position of the second projection can be represented by the centroid or center of the second projection (for example, point M1).

[0051] Please refer to Figure 6A In some embodiments, when the reference plane S is perpendicular to the inner surface IS, the second projection corresponding to the sound outlet 111a can be a line segment. The first projection 111b' can define multiple mutually parallel first feature line segments La that are perpendicular to the inner surface IS and whose ends are both located within the contour of the first projection 111b'. The endpoint of any first feature line segment La that is farther from the second projection can be a reference point A. The multiple reference points A include a first reference point A1 and a second reference point A2. The distance from any first reference point A1 to the second projection is less than the distance from any second reference point A2 to the second projection. It should be noted that since the second projection is a line segment (e.g., ... Figure 6AAs shown), the distance from reference point A (e.g., the first reference point A1 and the second reference point A2) to the second projection is the length of the perpendicular line segment drawn from reference point A to the second projection. The multiple first feature lines La include a first sub-segment La1 passing through the first reference point A1 and a second sub-segment La2 passing through the second reference point A2. The first sub-segment La1 has a first length, and the second sub-segment La2 has a second length; the first length is less than the second length. That is, on the first projection 111b', the portion farther from the second projection has a larger size, and the portion closer to the second projection has a smaller size. This ensures that the center of the first projection 111b' is as far away from the second projection as possible while simultaneously giving the first projection 111b' a larger area, thus avoiding acoustic short circuits while ensuring sufficient air permeability of the pressure relief hole 111b.

[0052] Please refer to Figure 6B In some embodiments, when the reference plane S is perpendicular to or inclined to the inner surface IS, the position of the second projection can be represented by the projection point M1 of the center point M of the sound outlet 111a onto the reference plane S; or, the position of the second projection can be represented by its centroid or center (e.g., point M1). In this case, the first projection 111b' can define multiple parallel second feature line segments Lb that are perpendicular to the inner surface IS and whose ends are both located within the contour of the first projection 111b'. The endpoint of any second feature line segment Lb that is closer to the center point M1 of the second projection is designated as a reference point B. Among the multiple reference points B, there are a third reference point B1 and a fourth reference point B2. The distance from any third reference point B1 to the center point M1 of the second projection is less than the distance from any fourth reference point B2 to the center point M1 of the second projection. The multiple second characteristic line segments Lb include a third sub-segment Lb1 passing through the third reference point B1 and a fourth sub-segment Lb2 passing through the fourth reference point B2. The third sub-segment Lb1 has a third length, and the fourth sub-segment Lb2 has a fourth length, with the third length being less than the fourth length. That is, on the first projection 111b', the portion farther from the center point M1 of the second projection has a larger size, and the portion closer to the center point M1 of the second projection has a smaller size. This ensures that the center of the first projection 111b' is as far away from the center point M1 of the second projection as possible, while also giving the first projection 111b' a larger area. This helps to avoid acoustic short circuits while ensuring that the first pressure relief hole 111b has sufficient air permeability.

[0053] In some embodiments, a first characteristic line segment La (or a second characteristic line segment Lb) can be defined on the effective vent port of the pressure relief hole 111b on the acoustic device 10. 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 reference point B). That is, the portion of the pressure relief hole 111b near the sound outlet hole 111a has a small size, and the portion far from the sound outlet hole 111a has a large size. This ensures that the pressure relief hole 111b has sufficient air permeability while avoiding acoustic short circuits.

[0054] In some embodiments, the projection of the sound-emitting part 11 onto the reference plane S has a major axis direction Y'. The major axis direction Y' of the projection may be in the same direction as the major axis direction Y of the sound-emitting part 11, or the angle between the major axis direction Y' of the projection and the major axis direction Y of the sound-emitting part may not exceed 10°.

[0055] In some embodiments, on the major axis direction Y' of the projection of the sound-emitting part 11 onto the reference plane S, the third reference point B1 and the fourth reference point B2 can be located on the same side of the center point M1 of the second projection. That is, the first projection 111b' is located on the same side of the center point M1 of the second projection on the major axis direction Y', thereby making the center of the first projection 111b' as far away as possible from the center point M1 of the second projection, and thus making the pressure relief hole 111b as far away as possible from the sound outlet hole 111a, so as to avoid acoustic short circuit. Please refer to Figure 6B For example, the reference point B is located on the side closer to the connection end CE relative to the center point M1 of the second projection.

[0056] In some embodiments, on the acoustic device 10, in the long axis direction Y, the pressure relief hole 111b can be entirely located on the same side as the sound outlet hole 111a, thereby keeping the center of the pressure relief hole 111b as far away from the sound outlet hole 111a as possible, thus avoiding acoustic short circuits. In other embodiments, in the long axis direction Y, the sound outlet hole 111a can also at least partially coincide with the pressure relief hole 111b, minimizing the impact of the acoustic hole's opening on the overall size of the acoustic device while minimizing the risk of acoustic short circuits.

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

[0058] In some embodiments, since the first side of the first projection 111b' is substantially parallel to the long axis direction Y' of the projection of the sound-emitting part 11 on the reference plane S, the first sidewall of the effective vent 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 part 11. At the same time, the effective vent port of the pressure relief hole 111b has a second sidewall corresponding to the second side. The relative relationship between the first sidewall and the second sidewall can be substantially the same as the relative relationship between the first side and the second sidewall.

[0059] Please refer to Figure 6B The first reference point A1 and the second reference point A2 can both be located on the second side. By placing the first reference point A1 and the second reference point A2 on the second side, it is easier to limit the distance from the first reference point A1 to the line segment shown in the second projection and the distance from the second reference point A2 to the line segment shown in the second projection. This makes it easier to define the first sub-line segment La1 and the second sub-line segment La2, thereby allowing the pressure relief hole 111b to be designed into a more regular shape and reducing the processing difficulty of the pressure relief hole 111b.

[0060] Please refer to Figure 6B In some embodiments, the third reference point B1 and the fourth reference point B2 may both be located on the first side. By setting the third reference point B1 and the fourth reference point B2 to be located on the first side, it is easier to delineate the third sub-segment Lb1 and the fourth sub-segment Lb2 in the second feature segment Lb, thereby designing the pressure relief hole 111b into a more regular shape and reducing the processing difficulty of the pressure relief hole 111b.

[0061] On the other hand, please refer to Figure 5 and Figure 6A The first sidewall of the effective ventilation 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 major axis direction Y is different, the first sidewall remains basically parallel to the major axis direction Y. That is, the first side of the first projection 111b' remains basically parallel to the major axis direction Y'. The position of the reference point B on the first projection 111b' corresponding to the pressure relief hole 111b with different inclination degrees remains unchanged, which makes it easy to distinguish the third sub-segment Lb1 and the fourth sub-segment Lb2.

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

[0063] Please refer to Figure 6B In some embodiments, along the major axis Y', as the distance between the reference point B of the second feature line segment Lb and the center of the second projection (i.e., point M1) increases, the length of the second feature line segment Lb also increases accordingly. That is, the portion of the first projection 111b' that is farther from the center point M1 of the second projection has a larger size, which in turn makes the centroid of the first projection 111b' farther from the center point M1 of the second projection, thereby making the pressure relief hole 111b farther from the sound outlet hole 111a, thus avoiding acoustic short circuit.

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

[0065] In some embodiments, the first feature segment La or the second feature segment Lb has a minimum length. The minimum length of the first feature segment La may refer to the length of the first feature segment La corresponding to the reference point A closest to the second projection on the second side of the first projection 111b', for example... Figure 6A The leftmost first sub-segment La1 is shown. The minimum length of the second feature segment Lb can refer to the length of the second feature segment Lb corresponding to the reference point B closest to the center point M1 of the second projection on the first side of the first projection 111b', for example... Figure 6B The leftmost third sub-segment Lb1 is shown. If the minimum length of the first characteristic segment La or the second characteristic segment Lb is too small, it will cause the end of the first pressure relief hole 111b near the sound outlet hole 111a to form a sharp angle, which will lead to the reflection of shorter wavelength sounds and introduce noise, affecting the listening effect. In some embodiments, in order to minimize the introduction of noise into the output of the acoustic device 10, the minimum length of the first characteristic segment La or the first characteristic segment Lb can be not less than 0.5mm, for example, 0.5mm-1mm.

[0066] In some embodiments, the portion of the effective vent of the pressure relief hole 111b near the sound outlet hole 111a can be an arc segment, that is, the ends of the first sidewall and the second sidewall near the sound outlet hole 111a can be connected by an arc segment to minimize the impact of sound wave reflection on listening. For example, as... Figure 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 one end of the first feature line segment La or the second feature line segment Lb of the minimum length can be the connection point between the projection of the arc segment and the second side.

[0067] In some embodiments, the maximum length of the first feature line segment La can refer to the length of the first feature line segment La corresponding to the reference point A that is farthest from the second projection on the second side of the first projection 111b', for example... Figure 6A The rightmost second sub-segment La2 is shown. In some embodiments, the maximum length of the second feature segment Lb can refer to the length of the second feature segment Lb corresponding to the reference point B furthest from the center point M1 of the second projection on the first side of the first projection 111b', for example... Figure 6B The rightmost second sub-segment Lb2 is shown. If the maximum length of the first characteristic segment a or the second characteristic segment b is too large, it will result in an excessively large area of ​​the first pressure relief hole 111b. To prevent the first pressure relief hole 111b from communicating with 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 large, which will result in an excessively large size of the sound-generating part 11, affecting the wearing comfort and portability of the acoustic device 10. In some embodiments, to avoid 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 segment La or the first characteristic segment Lb can be no greater than 1.6 mm, for example, 1.2 mm to 1.6 mm.

[0068] In some embodiments, the portion of the effective vent of the pressure relief hole 111b away from the sound outlet hole 111a can be an arc segment, that is, the ends of the first sidewall and the second sidewall away from the sound outlet hole 111a can be connected by an arc segment to minimize the impact of sound wave reflection on listening. For example, as shown... Figure 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 one end of the first feature line segment La or the second feature line segment Lb with the maximum length can be the connection point between the projection of the arc segment and the second side.

[0069] In some embodiments, on the acoustic device 10, the minimum dimension of the pressure relief hole 111b in the thickness direction X of the sound-emitting part 11 may be not less than 0.5 mm (e.g., 0.5 mm-1 mm), and the maximum dimension may be not greater than 1.6 mm (e.g., 1.2 mm-1.6 mm).

[0070] In some embodiments, the first side of the first projection 111b' is substantially parallel to the major axis direction Y' of the projection of the sound-emitting part 11 onto the reference plane S. Therefore, the first sidewall of the effective vent port of the pressure relief hole 111b, corresponding to the first side, is substantially parallel to the major axis direction Y of the sound-emitting part 11. Simultaneously, the effective vent port of the pressure relief hole 111b has a second sidewall corresponding to the second side. The relative relationship between the first and second sidewalls can be substantially the same as the relative relationship between the first and second sidewalls. The inclination angle of the pressure relief hole 111b relative to the major axis direction Y, as mentioned below, can refer to the inclination angle of the second sidewall of the effective vent port of the pressure relief hole 111b relative to the major axis direction Y.

[0071] Please refer to Figure 5 , Figure 6A and Figure 6B In some embodiments, the included angle θ1 between the second side and the first side can reflect the area of ​​the first projection 111b', thereby reflecting the area of ​​the effective vent port of the pressure relief hole 111b. Please refer to... Figure 5 Since the position of the bracket 112 is fixed, that is, the position of the first sidewall of the effective vent port of the pressure relief hole 111b is fixed, when the angle θ1 between the second side and the first side is larger, the inclination angle of the second sidewall of the effective vent port of the pressure relief hole 111b relative to the major axis direction Y is larger. In other words, the greater the inclination of the pressure relief hole 111b and its effective vent port relative to the major axis direction Y, the larger the portion of the pressure relief hole 111b blocked by the bracket 112. Correspondingly, the area of ​​the effective vent 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 is completely curved, the angle θ1 between the second side and the first side can refer to the angle between the tangent of a specified point on the second side (e.g., the midpoint of the second side) and the first side, or the angle between the line connecting the two endpoints of the second side and the first side. When the second side includes an arc-shaped edge and a straight edge, the included angle θ1 between the second side and the first side can refer to the included angle between the straight edge of the second side and the first side. In some embodiments, since the minimum length of the first feature line segment La or the second feature line segment Lb can be not less than 0.5mm (e.g., 0.5mm-1mm), the second side can include an arc-shaped edge and a straight edge. The arc-shaped edge can correspond to the projection of the arc segment described above onto the reference plane S. The arc-shaped edge is connected to the end of the first side that is relatively closer to the second projection, and the straight edge is connected to the end of the first side that is relatively farther away from the second projection, so as to avoid the pressure relief hole 111b forming a sharp angle as much as possible, thereby avoiding affecting the user's listening effect.

[0072] Figure 7This is a schematic diagram of the frequency response curve of the acoustic device corresponding to the pressure relief hole when the second side and the first side are at different angles, according to some embodiments of this specification.

[0073] Please refer to Figure 7 , where curve L 71 The angle θ1 between the second side and the first side is set to 0°, that is, the first and second sidewalls of the effective vent of the pressure relief hole 111b are both set along the long axis direction Y. At this time, the effective vent of the pressure relief hole 111b can be set in the shape of a rectangle or a rounded rectangle; curve L 72 The angle θ1 between the second side and the first side is set at 30°, that is, the first sidewall of the effective vent port of the pressure relief hole 111b is set along the long axis direction Y, and the second sidewall is set at a 30° angle with the long axis direction Y; curve L 73 The angle θ1 between the second side and the first side is set at 45°, that is, the first sidewall of the effective vent port of the pressure relief hole 111b is set along the long axis direction Y, and the second sidewall is set at a 45° angle with the long axis direction Y; curve L 74 The angle θ1 between the second side and the first side is set at 60°, that is, the first sidewall of the effective vent port of the pressure relief hole 111b is set along the long axis direction Y, and the second sidewall is set at an angle of 60° with the long axis direction Y.

[0074] like Figure 7 As shown, as the angle θ between the second side and the first side increases, the resonant 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 increased. In some embodiments, in order to ensure that the resonant frequency of the rear cavity on the rear side of the diaphragm 113 connected to the pressure relief hole 111b is not lower than 3kHz, so that the acoustic device 10 has a flatter output over a wider frequency range and improves the output performance of the acoustic device 10, the effective venting port of the pressure relief hole 111b can be tilted at an angle of 0°-45° relative to the major axis direction Y on the acoustic device 10. In some embodiments, in order to further improve the output performance of the acoustic device 10, the effective venting port of the pressure relief hole 111b can be tilted at an angle of 0°-30° relative to the major axis direction Y.

[0075] While improving the output performance of the acoustic device 10, to ensure sufficient air permeability of the pressure relief hole 111b, the included angle θ1 between the second side and the first side can be 0°-60°. In some embodiments, to avoid the effective air permeability area of ​​the pressure relief hole 111b being too small, and to further ensure sufficient air permeability of the first pressure relief hole 111b, the included angle θ1 between the second side and the first side can be 20°-50°. In some embodiments, to avoid the effective air permeability area of ​​the pressure relief hole 111b being too small, and to further ensure sufficient air permeability of the first pressure relief hole 111b, the included angle θ between the second side and the first side can be 30°-45°.

[0076] Please refer to Figure 6A and Figure 6B In some embodiments, when the first projection 111b' is located on the same side of the second projection in the major 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 major axis direction Y', with a first feature point Pb on the first end that is closest to the second projection. In some embodiments, the first feature point Pb may be determined based on the center point M1 of the second projection. In some embodiments, when the second projection is a line segment, the first feature point Pb may be determined based on the endpoint of the second projection that is closer to the first projection 111b'.

[0077] Figure 8A This is a schematic diagram showing the positions of the first reference point and the second reference point according to some embodiments of this specification. Please refer to... Figure 8A In some embodiments, a first characteristic length exists between the first reference point A1 and the first feature point Pb, and the ratio of the first length of the first sub-segment La1 to the first characteristic length is the first length ratio. In the triangle A1'PbA1 formed by the two endpoints (endpoint A1' and the first reference point A1) of the first feature point Pb and the first sub-segment La1, the sin∠A1'PbA1 value of the angle corresponding to the first feature point Pb (i.e., ∠A1'PbA1) is the first length ratio. A second characteristic length exists between the second reference point A2 and the first feature point Pb, and the ratio of the second length of the second sub-segment La2 to the second characteristic length is the second length ratio. Specifically, in the triangle A2'A2Pb formed by the two endpoints (endpoint A2' and the second reference point A2) of the first feature point Pb and the second sub-segment La2, the sin∠A2'PbA2 value of the angle corresponding to the first feature point Pb is the first length ratio. The value of A2'PbA2 is the second length ratio.

[0078] In some embodiments, the first length ratio can be greater than the second length ratio to ensure that the length of the first feature line segment La increases with the distance from the reference point to the second projection, while avoiding an excessively large size of the first projection 111b'. This ensures that the pressure relief hole 111b has sufficient air permeability while minimizing sound wave interference; it also prevents the pressure relief hole 111b from being too large, which would result in an excessively large size of the sound-generating part 11, affecting the wearing comfort and portability of the acoustic device 10. Specifically, since points Pb, A1', and A2' are collinear (i.e., points Pb, A1', and A2' are all on the first side), and the first sub-line segment La1 (i.e., line A1A1') is perpendicular to line PbA1', and the second sub-line segment La2 (i.e., line A2A2') is perpendicular to line PbA1'. When the first reference point A1 is located outside triangle A2A2'Pb, it means that ∠A1PbA1' is greater than ∠A2PbA2', that is, the first length ratio is greater than the second length ratio. Figure 6A As shown. At this time, the curvature change of the second side of the first projection 111b' is relatively gentle. In other words, the curvature change of the second sidewall of the effective vent port of the pressure relief hole 111b is relatively gentle. Specifically, compared with the line connecting the two endpoints of the second side, the second side protrudes downward to reduce the processing difficulty of the pressure relief hole 111b.

[0079] In some instances, the first length ratio can be equal to the second length ratio. In this case, the first projection can be a regular triangular or rectangular structure, meaning the line connecting the two endpoints of the second side is the second side. Specifically, when the first reference point A1 is located on the hypotenuse A2Pb of triangle A2A2'Pb, it means that ∠A1PbA1' is equal to ∠A2PbA2', that is, the first length ratio is equal to the second length ratio.

[0080] In some embodiments, the curvature of the second side of the first projection 111b' changes drastically; in other words, the curvature of the second sidewall of the effective vent port of the pressure relief hole 111b changes drastically. Figure 8A As shown. When the first reference point A1 is located inside triangle A2A2'Pb, it means that ∠A1PbA1' is less than ∠A2PbA2', that is, the first length ratio is less than the second length ratio. Specifically, compared to the line connecting the two endpoints of the second side, the second side protrudes upward. This makes the length of the first feature line segment La, which is farther away from the second projection, change more drastically and increase more significantly. Consequently, the size of the part of the first projection 111b' that is farther away from the second projection increases more, and thus the center of the first projection 111b' is farther away from the second projection, making the pressure relief hole 111b farther away from the sound outlet hole 111a, thus avoiding acoustic short circuit.

[0081] Figure 8BThis is a schematic diagram showing the positions of the third and fourth reference points according to some embodiments of this specification. Please refer to... Figure 8B The third reference point B1 and the first feature point Pb have a third characteristic length, and the ratio of the third length of the third sub-segment Lb1 to the third characteristic length is the third length ratio. In the triangle B1B1'Pb formed by the two endpoints of the first feature point Pb and the third sub-segment Lb1 (for example, one endpoint is the third reference point B1 and the other endpoint is point B1'), the tan∠B1PbB1' value of the angle corresponding to the first feature point Pb (i.e., ∠B1PbB1') is the third length ratio. The fourth reference point B2 and the first feature point Pb have a fourth characteristic length, and the ratio of the fourth length of the fourth sub-segment Lb2 to the fourth characteristic length is the fourth length ratio. Specifically, in the triangle B2B2'Pb formed by the first feature point Pb and the two endpoints of the fourth sub-segment Lb2 (for example, one endpoint is the fourth reference point B2 and the other endpoint is point B2'), the tan∠B2PbB2' value of the angle corresponding to the first feature point Pb (i.e. ∠B2PbB2') is the fourth length ratio.

[0082] In some embodiments, the third length ratio can be greater than the fourth length ratio to ensure that the length of the first feature segment Lb increases with the distance from the reference point to the center of the second projection, while avoiding an excessively large size of the first projection 111b'. This ensures sufficient air permeability of the pressure relief hole 111b while minimizing acoustic interference; it also prevents the pressure relief hole 111b from becoming too large, which would result in an excessively large size of the sound-generating part 11, affecting the wearing comfort and portability of the acoustic device 10. Specifically, since points Pb, B1, and B2 are collinear (i.e., points Pb, B1, and B2 are all on the first side), and the third sub-segment Lb1 (i.e., line B1B1') is perpendicular to line PbB1, and the fourth sub-segment Lb2 (i.e., line B2B2') is perpendicular to line PbB2. When point B1' is outside triangle B2B2'Pb, it means that ∠B1PbB1' is greater than ∠B2PbB2', that is, the third length ratio is greater than the fourth length ratio, such as... Figure 6B As shown. At this time, the curvature change of the second side of the first projection 111b' is relatively gentle. Specifically, compared with the line connecting the two endpoints of the second side, the second side protrudes downward. In other words, the curvature change of the second sidewall of the effective ventilation port of the pressure relief hole 111b is relatively gentle, so as to reduce the processing difficulty of the pressure relief hole 111b.

[0083] In some instances, the third length ratio can be equal to the fourth length ratio. In this case, the first projection can be a regular triangular or rectangular structure, meaning the line connecting the two endpoints of the second side is the second side. Specifically, when point B1' lies on the hypotenuse B2'Pb of triangle B2B2'Pb, it means that ∠B1PbB1' is equal to ∠B2PbB2', i.e., the third length ratio is equal to the fourth length ratio.

[0084] In some embodiments, the curvature of the second side of the first projection 111b' changes drastically; in other words, the curvature of the second sidewall of the effective vent port of the pressure relief hole 111b changes drastically. Figure 8B As shown. When point B1' is inside triangle B2B2'Pb, it indicates that ∠ B1PbB1' is less than ∠B2PbB2', meaning the third length ratio is less than the fourth length ratio, such as Figure 8B As shown. Specifically, compared to the line connecting the two endpoints of the second side, the second side protrudes upward. This causes the length of the second feature segment Lb to change more drastically and increase more significantly the farther it is from the second projection. Consequently, the portion of the first projection 111b' that is farther from the center of the second projection increases in size more, thus making the center of the first projection 111b' farther from the center of the second projection. This also makes the pressure relief hole 111b farther from the sound outlet hole 111a, avoiding acoustic short circuits.

[0085] In some embodiments, the portion of the pressure relief hole 111b farther from the sound outlet hole 111a increases in size by a greater margin, thus ensuring a greater distance between the center of the pressure relief hole 111b and the sound outlet hole 111a, preventing acoustic short circuits. In other embodiments, the portion of the pressure relief hole 111b closer to the sound outlet hole 111a decreases in size by a smaller margin or decreases linearly, giving the pressure relief hole 111b a larger area and ensuring sufficient air permeability.

[0086] In some embodiments, such as Figure 4A and Figure 4B As shown, compared to the connection end CE, the sound outlet 111a can be positioned closer to the free end FE, which makes it easier for the sound outlet 111a to be closer to the user's external ear canal when worn, so that the sound output from the front side of the diaphragm 113 of the sound-producing part 111 can be better transmitted to the user's ear canal, thereby increasing the user's listening volume.

[0087] In some embodiments, such as Figure 6A As shown, along the major axis direction Y', the first reference point A1 is closer to the center point H1 of the projection of the free end FE onto the reference plane S than the second reference point A2. In some embodiments, as... Figure 6BAs shown, along the major axis Y', the third reference point B1 is closer to the center point H1 of the projection of the free end FE onto the reference plane S than the fourth reference point B2. That is, the end of the first projection 111b' closer to the projection of the free end FE has a smaller dimension, while the end further away from the projection of the free end FE has a larger dimension; correspondingly, the effective venting port of the pressure relief hole 111b is narrower in the portion closer to the free end FE and wider in the portion further away from the free end FE. Since the sound outlet hole 111a is closer to the free end FE than the connecting end CE, the effective venting port of the pressure relief hole 111b is farther from the sound outlet hole 111a, while still ensuring sufficient air permeability. The distance from the reference point of the first projection 111b' (e.g., 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' (e.g., reference point A, reference point B) to the projection of the center (e.g., centroid) of the free end FE. In some embodiments, when the free end FE is a plane, the projection of the free end FE onto the reference plane S is a straight line segment, and the center point H1 can be the midpoint of this straight line segment. In some embodiments, when the free end FE is a curved surface, the projection of the free end FE onto the reference plane S is an arc segment, and the center point H1 can be the midpoint of this arc segment, or the point on the arc segment farthest from the line connecting its two ends. Specifically, in the major axis direction Y', the distance from the reference point to the center point H1 of the projection of the free end FE onto the reference plane S can refer to the distance from the reference point to a straight line perpendicular to the major axis direction Y' passing through the center point H1.

[0088] In some embodiments, the distance on the major axis direction Y' between the first reference point A1 and the center point H1 of the projection of the free end FE onto the reference plane S is the fifth characteristic length, and the ratio of the first length to the fifth characteristic length of the first sub-segment La1 is the fifth length ratio. Since the first side is parallel to the major axis direction Y' and the first characteristic segment La is perpendicular to the inner side surface IS, the first characteristic segment La is perpendicular to the first side. Specifically, a straight line L1 perpendicular to the major axis direction Y' is drawn through point H1. The distance on the major axis direction Y' from the first reference point A1 to point H1 can refer to the distance from the first reference point A1 to the straight line L1, and this distance is equal to the distance from the other endpoint A1' of the first sub-segment La1 to the straight line L1. For example, a perpendicular line can be drawn from the first reference point A1 to line L1, intersecting line L1 at point J1. The length of line segment A1J1 is the distance between the first reference point A1 and line L1. Similarly, a perpendicular line can be drawn from point A1' to line L1, intersecting line L1 at point J1'. The length of line segment A1'J1' is the distance between endpoint A1' and line L1, and point J1' is the perpendicular point between the first side and line L1. In this case, the length of A1'J1' is equal to the length of line segment A1J1, and the length of line segment A1'J1' can also be used as the fifth characteristic length. In the triangle A1J1A1' formed by point J1 and the two endpoints (first reference point A1, endpoint A1') of the first sub-segment La1, the tan∠A1J1A1' value of the angle corresponding to point J1 (i.e. ∠A1J1A1') is the fifth length ratio; similarly, the tan∠A1J1'A1' value of the angle ∠A1J1'A1' corresponding to point J1' can also be the fifth length ratio.

[0089] Similarly, the distance from the second reference point A2 to line L1 is equal to the distance from point A2' to line L1. A perpendicular line is drawn from the second reference point A2 to line L1, intersecting line L1 at point J2. The length of line segment A2J2 is the distance between the second reference point A2 and line L1. Since the first side is parallel to the major axis direction Y', and points J2, A1', and A2' are collinear, the length of line segment A2'J1' is equal to the length of line segment A2J2. The length of either line segment A2J2 or line segment A2'J1' can be used as the sixth characteristic length. In the triangle A2J2A2' formed by point J2 and the two endpoints (second reference point A2, endpoint A2') of the second sub-segment La2, the tan∠A2J2A2' of the angle corresponding to point J2 (i.e. ∠A2J2A2') is the sixth length ratio. Similarly, the tan∠A2J1'A2' of the angle corresponding to point J1' can also be the sixth length ratio.

[0090] In some embodiments, such as Figure 6A or Figure 8AAs shown, the fifth length ratio is less than the sixth length ratio. This results in the first characteristic line segment La increasing in length faster the distance from the center point H1 of the projection of the free end FE. Consequently, the portion of the first projection 111b' farther from the projection of the free end FE has a larger size. In other words, the portion of the effective vent of the pressure relief hole 111b farther from the sound outlet hole 111a has a larger size, thus minimizing the possibility of acoustic short circuits. The distance between the center point H1 of the projection of the first characteristic line segment La and the free end FE refers to the distance between the reference point A of the first characteristic line segment La and the center point H1 of the projection of the free end FE along the major axis direction Y'.

[0091] In some embodiments, the fifth length ratio can be equal to the sixth length ratio, in which case the second side can be a straight line segment pointing to the perpendicular point J1' of the first side and the straight line L1. In some embodiments, the fifth length ratio can be greater than the sixth length ratio. This results in a larger size for the portion of the first projection 111b' near the free end, ensuring that the pressure relief hole 111b has sufficient air permeability.

[0092] In some embodiments, the distance between the third reference point B1 and the center point H1 of the projection of the free end FE onto the reference plane S along the major axis direction Y' is the seventh characteristic length, and the ratio of the third length to the seventh characteristic length of the third sub-segment Lb1 is the seventh length ratio. Since the first side is parallel to the major axis direction Y' and the second characteristic segment Lb is perpendicular to the inner side surface IS, the second characteristic segment Lb is perpendicular to the first side. In some embodiments, a straight line L1 perpendicular to the major axis direction Y' is drawn through point H1. The distance from the third reference point B1 to point H1 along the major axis direction Y' can refer to the distance from the third reference point B1 to the straight line L1. For example, a perpendicular line to the straight line L1 can be drawn through the third reference point B1 of the third sub-segment Lb1, intersecting the straight line L1 at point J3. The length of segment B1J3 is the distance between the third reference point B1 and the straight line L1, and the length of segment B1J3 is the seventh characteristic length. In the triangle B1J3B1' formed by point J3 and the two endpoints (third reference point B1, endpoint B1') of the third sub-segment Lb1, the tan∠B1J3B1' value of the angle ∠B1J3B1' corresponding to point J3 is the seventh length ratio. In some embodiments, the distance on the major axis direction Y' between the center point H1 of the projection of the fourth reference point B2 and the free end FE onto the reference plane S is the eighth characteristic length. Since the first side is parallel to the major axis direction Y', and point J3, the third reference point B1, and the fourth reference point B2 are collinear (i.e., points J3, B1, and B2 are all on the first side), the length of segment B2J3 is the eighth characteristic length. In the triangle B2J3B2' formed by point J3 and the two endpoints (fourth reference point B2, endpoint B2') of the fourth sub-segment Lb2, the tan∠B2J3B2' value of the angle ∠B2J3B2' corresponding to point J3 is the eighth length ratio.

[0093] In some embodiments, such as Figure 6B or Figure 8B As shown, the seventh length ratio is less than the eighth length ratio. This means that the farther the second characteristic line segment Lb is from the center point H1 of the projection of the free end FE, the faster the length of the second characteristic line segment Lb increases. Consequently, the portion of the first projection 111b' farther from the projection of the free end FE has a larger size. In other words, the portion of the effective vent of the pressure relief hole 111b farther from the sound outlet hole 111a has a larger size, thus minimizing the possibility of acoustic short circuits. The distance between the second characteristic line segment Lb and the center point H1 of the projection of the free end FE refers to the distance between the reference point B of the second characteristic line segment Lb and the center point H1 of the projection of the free end FE along the major axis direction Y'.

[0094] In some embodiments, the seventh length ratio can be equal to the eighth length ratio, in which case the second side can be a straight line segment pointing to the perpendicular point J1' of the first side and the straight line L1. In some embodiments, the seventh length ratio can be greater than the eighth length ratio. This results in a larger dimension of the portion of the first projection 111b' near the free end, ensuring that the pressure relief hole 111b has sufficient air permeability.

[0095] In some embodiments, the portion of the pressure relief hole 111b that is farther from the free end FE has a larger size, thereby making the centroid of the pressure relief hole 111b farther from the sound outlet hole 111a, ensuring that the pressure relief hole 111b is farther from the sound outlet hole 111a, so as to minimize the occurrence of acoustic short circuit.

[0096] In some embodiments, the first projection 111b' has two endpoints that are furthest apart in the major axis direction Y' (e.g., Figure 6A and Figure 6B As shown, for points Qb1 and Qb2, the line segment of the first characteristic line segment Lb that passes through the midpoint of the two farthest endpoints (i.e., the midpoint Qb3 of the line connecting points Qb1 and Qb2) divides the first projection 111b' into two parts, for example... Figure 6A The first feature line segment La passing through point Qb3 has two regions: one to the left (closer to the second projection) and one to the right (farther from the second projection). The region enclosed by the portion of the first projection 111b' closer to the second projection (e.g., the center point M1 of the second projection) has a first area, and the region enclosed by the portion further away from the second projection (e.g., the center point M1 of the second projection) 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. This results in a smaller size for the portion of the first projection 111b' closer to the second projection and a larger size for the portion further away from the second projection. In other words, the effective venting port of the pressure relief hole 111b is narrower near the sound outlet 111a and wider away from the sound outlet 111a, thus ensuring sufficient air permeability of the pressure relief hole 111b while keeping the effective venting port as far away from the sound outlet 111a as possible.

[0097] If the ratio of the first area to the second area is too small, it may be because the first area is too small or the second area is too large. When the first area is too small, the effective ventilation port of the pressure relief hole 111b may form a sharp angle near the sound outlet hole 111a, which may lead to the reflection of shorter wavelength sounds and introduce noise, affecting the output performance of the acoustic device 10. If the second area is too large, it may result in the sound-generating part 11 being 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 because 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 hole 111a, resulting in an acoustic short circuit.

[0098] In some embodiments, to improve the output performance and wearing comfort of the acoustic device 10 while avoiding acoustic short circuits, the ratio of the first area to the second area can be 0.5-0.99. In some embodiments, 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, to further avoid acoustic short circuits, the ratio of the first area to the second area can be 0.45-0.7.

[0099] In some embodiments, the effective venting port of the pressure relief hole 111b may have two endpoints that are furthest apart in the long axis direction Y. A line segment passing through the midpoint of the two endpoints and perpendicular to the inner surface IS divides the effective venting port into two parts. In the aforementioned two parts, the area enclosed by the part closer to the sound outlet 111a is smaller than the area enclosed by the part farther away from the sound outlet 111a. This results in the effective venting port of the pressure relief hole 111b having a smaller size in the part closer to the sound outlet 111a and a larger size in the part farther away from the sound outlet 111a. This ensures that the pressure relief hole 111b has sufficient air permeability while being farther away from the sound outlet 111a.

[0100] In order to improve the output performance and wearing comfort of the acoustic device 10, and at the same time avoid acoustic short circuits, the ratio of the area enclosed by the part closer to the sound outlet 111a in the effective ventilation port of the pressure relief hole 111b to the area enclosed by the part farther away from the sound outlet 111a can be 0.5-0.99.

[0101] 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 ventilation port of the pressure relief hole 111b may be too small, resulting in a lower resonant frequency of the rear cavity on the back side of the diaphragm 113 connected to the pressure relief hole 111b, affecting the output performance of the acoustic device 10. Simultaneously, a small effective ventilation port area of ​​the pressure relief hole 111b may also lead to insufficient air permeability, easily generating standing waves that 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 ventilation port of the pressure relief hole 111b may be too long and narrow, resulting in a higher acoustic impedance at the effective ventilation port of the pressure relief hole 111b, resulting in a lower resonant frequency of the rear cavity on the back side of the diaphragm 113 connected to the pressure relief hole 111b, affecting the output performance of the acoustic device 10. Furthermore, a large first projection 111b' in the long axis direction Y may result in an excessively large size of the sound-generating part 11, affecting the wearing comfort of the acoustic device 10. The dimension of the first projection 111b' along the major axis direction Y' can refer to the length of the line connecting points Qb1 and Qb2, or it can refer to the length of the line connecting the two closest and farthest points of the first projection 111b' along the major axis direction Y' from the second projection (e.g., the center M1 of the second projection). In some embodiments, 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' along the major axis direction Y' can be 4mm-6mm, that is, the dimension of the first projection 111b' along the major axis direction Y' can be 4mm-6mm. In some embodiments, to further improve the output performance and wearing comfort of the acoustic device 10, the dimension of the first projection 111b' along the major axis direction Y' can be 4.3mm-5.5mm.

[0102] In some embodiments, to improve the output performance and wearing comfort of the acoustic device 10, the effective ventilation port of the pressure relief hole 111b can have a size of 4mm-6mm in the major axis direction Y. The size of the pressure relief hole 111b in the major axis direction Y can refer to the length of the line connecting the two farthest endpoints of the effective ventilation port of the aforementioned pressure relief hole 111b in the major axis direction Y.

[0103] Please refer to Figures 4A-8BIn 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 transition area of ​​the edge or arc where the upper side US intersects with other sides (e.g., the inner side IS), it can also be considered that the first pressure relief hole 111b-1 is 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 can be 12mm-15mm. In some embodiments, to further avoid acoustic short circuits, the distance between the first pressure relief hole 111b-1 and the sound outlet hole 111a can be 12.5mm-13.5mm. Exemplarily, the distance between the first pressure relief hole 111b-1 and the sound outlet hole 111a can be 12.8mm, 13mm, 14mm, or 14.5mm.

[0104] In some embodiments, the length of the first feature segment La or the second feature segment Lb of the projection 111b-1' of the effective vent of the first pressure relief hole 111b-1 on the reference plane S (e.g., the first reference plane S1) can be 0.5mm-1.6mm. In some embodiments, the angle θ1 between the second side and the first side of the projection 111b-1' of the effective vent of the first pressure relief hole 111b-1 on the first reference plane S1 can be 0°-60°. For example, the angle θ1 between the second side and the first side of the projection 111b-1' of the effective vent of the first pressure relief hole 111b-1 on the first reference plane S1 can be 35°. In some embodiments, the ratio of the first area to the second area of ​​the projection 111b-1' of the effective vent of the first pressure relief hole 111b-1 on the first reference plane S1 can be 0.5-0.7. For example, the ratio of the first area to the second area of ​​the effective vent of the first pressure relief hole 111b-1' projected onto the first reference plane S1 can be 0.6. In some embodiments, the distance between the two farthest endpoints of the projection 111b-1' on the major axis direction Y' can be 5mm-6mm, that is, the size of the effective vent of the first pressure relief hole 111b-1' projected onto the first reference plane S1 on the major axis direction Y' can be 5mm-6mm. For example, the size of the effective vent of the first pressure relief hole 111b-1' projected onto the first reference plane S1 on the major axis direction Y' can be 5.5mm.

[0105] In some embodiments, the effective vent of the first pressure relief hole 111b-1 can have a dimension of 0.5mm-1.6mm in the thickness direction X of the sound-generating part 11. In some embodiments, the ratio of the area enclosed by the portion of the effective vent of the first pressure relief hole 111b-1 closer to the sound outlet hole 111a to the area enclosed by the portion farther from the sound outlet hole 111a can be 0.5-0.7. In some embodiments, the effective vent of the first pressure relief hole 111b-1 can have a dimension of 5mm-6mm in the major axis direction Y.

[0106] 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, such as Figure 4A and Figure 4B As shown, the second pressure relief hole 111b-2 is configured to discharge the sound generated behind the diaphragm 113 to the housing 111. It should be noted that when the second pressure relief hole 111b-2 is located in the transition region of the edge or arc where the lower side LS intersects with other sides (e.g., the inner side IS), it can also be considered that the second pressure relief hole 111b-2 is located on the lower side LS. In some embodiments, the pressure relief hole 111b may include only one of the first pressure relief hole 111b-1 or the second pressure relief hole 111b-2, or it may include both the first pressure relief hole 111b-1 and the second pressure relief hole 111b-2.

[0107] Figure 9 This is an exemplary structural diagram of the second pressure relief hole shown in some embodiments of this specification. Figure 10A and Figure 10B These are schematic diagrams showing the positions of different reference points according to some embodiments of this specification.

[0108] In some embodiments, to avoid acoustic short circuits, the effective vent of the second pressure relief hole 111b-2 needs to be relatively far from the sound outlet 111a. The distance between the effective vent of the second pressure relief hole 111b-2 and the sound outlet 111a can be 15mm-20mm. In some embodiments, to further avoid acoustic short circuits, the distance between the effective vent of the second pressure relief hole 111b-2 and the sound outlet 111a can be 16mm-18mm. For example, the distance between the effective vent of the second pressure relief hole 111b-2 and the sound outlet 111a can be 17mm.

[0109] In some embodiments, when the pressure relief hole 111b includes both a first pressure relief hole 111b-1 and a second pressure relief hole 111b-2, the distance between the effective vent port of the first pressure relief hole 111b-1 and the sound outlet hole 111a can be smaller than the distance between the effective vent port of the second pressure relief hole 111b-2 and the sound outlet hole 111a. Specifically, the distance between the effective vent port of the first pressure relief hole 111b-1 and the sound outlet hole 111a can refer to the distance between the center point B of the effective vent port of the first pressure relief hole 111b-1 and the center point M of the sound outlet hole 111a; similarly, the distance between the effective vent port of the second pressure relief hole 111b-2 and the sound outlet hole 111a can refer to the distance between the center point C of the effective vent port of the second pressure relief hole 111b-2 and the center point M of the sound outlet hole 111a. Figure 4A and Figure 4B As shown.

[0110] Please refer to Figure 9 , Figure 10A and Figure 10B In some embodiments, the reference plane S (e.g., the first reference plane S1) of the first pressure relief hole 111b-1 and the reference plane S (e.g., the second reference plane S2) of the second pressure relief hole 111b-2 may be the same or different. Specifically, the second reference plane S2 of the second pressure relief hole 111b-2 may be parallel or tangent to the side where the effective vent of the second pressure relief hole 111b-2 is located. For example, the second pressure relief hole 111b-2 is located on the lower side LS. When the lower side LS is a plane, the second reference plane S2 may be parallel to the lower side LS, or the plane where the lower side LS is located may be the second reference plane S2; when the lower side LS is a curved surface, the second reference plane S2 may be tangent to the lower side LS. In some embodiments, the second reference plane S2 may also be perpendicular to the inner side IS. In some embodiments, the first reference plane S1 of the first pressure relief hole 111b-2 and the second reference plane S2 of the second pressure relief hole 111b-2 are parallel. In some embodiments, the first reference plane S1 and the second reference plane S2 may be the same plane.

[0111] In some embodiments, the length of the first feature segment La or the second feature segment Lb of the projection 111b-2' of the effective vent of the second pressure relief hole 111b-2 on the reference plane S (e.g., the second reference plane S2) can be 1 mm to 1.6 mm. In some embodiments, the angle θ2 between the second side and the first side of the projection 111b-2' of the effective vent of the second pressure relief hole 111b-2 on the second reference plane S2 can be 0° to 60°. Exemplarily, the angle θ1' between the second side and the first side of the projection 111b-2' of the effective vent of the second pressure relief hole 111b-2 on the second reference plane S2 can be 35°. In some embodiments, the ratio of the first area to the second area of ​​the projection 111b-2' of the effective vent of the second pressure relief hole 111b-2 on the second reference plane S2 can be 0.7 to 0.99. For example, the ratio of the first area to the second area of ​​the effective vent of the second pressure relief hole 111b-2 projected onto the second reference plane S2 can be 0.9. In some embodiments, the distance between the two farthest endpoints of the projection 111b-2' on the major axis direction Y' can be 4mm-5mm, that is, the size of the effective vent of the second pressure relief hole 111b-2 projected onto the second reference plane S2 on the major axis direction Y' can be 4mm-5mm. For example, the size of the effective vent of the second pressure relief hole 111b-2 projected onto the second reference plane S2 on the major axis direction Y' can be 4.5mm.

[0112] In some embodiments, the effective vent of the second pressure relief hole 111b-2 can have a dimension of 1mm-1.6mm in the thickness direction X of the sound-generating part 11. In some embodiments, the ratio of the area enclosed by the portion of the effective vent of the second pressure relief hole 111b-2 closer to the sound outlet hole 111a to the area enclosed by the portion farther from the sound outlet hole 111a can be 0.7-0.99. In some embodiments, the effective vent of the second pressure relief hole 111b-2 can have a dimension of 4mm-5mm in the major axis direction Y.

[0113] Please refer to Figure 4A and Figure 4BSince the second pressure relief hole 111b-2 can be positioned further from the sound outlet hole 111a than the first pressure relief hole 111b-1, the relative size of the area enclosed by the portion closer to the sound outlet hole 111a and the area enclosed by the portion farther from the sound outlet hole 111a in the effective ventilation port of the second pressure relief hole 111b-2 has a smaller impact on the distance between the center of the effective ventilation port of the second pressure relief hole 111b-2 and the sound outlet hole 111a. Therefore, 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 the first area ratio, and the ratio of the first area to the second area of ​​the projection 111b-2' is the second area ratio. 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 vent of the first pressure relief hole 111b-1 can be less than the ratio of the first area to the second area of ​​the effective vent of the second pressure relief hole 111b-2. In some embodiments, the ratio of the first area to the second area of ​​the effective vent of the second pressure relief hole 111b-2 can be greater than, less than, or equal to 1; that is, in the effective vent of the second pressure relief hole 111b-2, the area enclosed by the portion closer to the sound outlet hole 111a can also be greater than, less than, or equal to the area enclosed by the portion farther away from the sound outlet hole 111a.

[0114] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0115] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0116] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments of the invention, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.

[0117] In some embodiments, the numerical parameters used in the specification and claims are approximate values, which may be changed depending on the characteristics required by individual embodiments. In some embodiments, the numerical parameters should take into account specified significant digits and employ a general method of digit preservation. Although the numerical ranges and parameters used to confirm their breadth of application in some embodiments are approximate values, in specific embodiments, such values ​​are set as precisely as feasible.

[0118] Finally, it should be understood that the embodiments described in this application are merely illustrative of the principles of the embodiments of this application. Other modifications may also fall within the scope of this application. Therefore, alternative configurations of the embodiments of this application are considered as examples and not limitations, and are regarded as consistent with the teachings of this application. Accordingly, the embodiments of this application are not limited to the embodiments explicitly described and illustrated in this application.

Claims

1. An acoustic device, characterized in that, include: A sound-generating part includes a housing and a diaphragm housed within the housing, the diaphragm being configured to generate sound by vibration; The suspension structure is configured to place the sound-producing part near the user's ear canal without obstructing the ear canal, wherein... In the wearing state, the inner side of the housing facing the user's auricle has a sound outlet, which is configured to exhaust sound generated by the front side of the diaphragm through the housing; the other sides of the housing, excluding the inner side, have pressure relief holes, which are configured to exhaust sound generated by the rear side of the diaphragm through the housing; wherein... The pressure relief hole includes an effective vent port, which has a first projection on a reference plane. The reference plane is parallel or tangent to the side where the effective vent port is located and is perpendicular to the inner side. The first projection defines multiple mutually parallel first feature line segments that are perpendicular to the inner side and whose ends are both located within the contour of the first projection. The sound outlet has a second projection on the reference plane. The endpoint of any first feature line segment that is farther from the second projection is used as a reference point. The plurality of reference points include a first reference point and a 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 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, and the second sub-line segment has a second length. The first length is less than the second length.

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

3. The acoustic device as described in claim 2, characterized in that, The angle between the second side and the first side is 0°-60°.

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

5. The acoustic device as described in claim 2 or 4, characterized in that, The length of the first feature line segment is 0.5mm-1.6mm.

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

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

8. The acoustic device as claimed in claim 1, characterized in that, The housing includes a connecting end connected to the suspension structure and a free end away from the connecting end, wherein the sound outlet is located closer to the free end than to the connecting end.

9. The acoustic device as claimed in claim 8, characterized in that, The projection of the sound-emitting part onto the reference plane has a major axis direction, and in the major axis direction, the first reference point is closer to the center of the projection of the free end onto the reference plane than the second reference point.

10. The acoustic device as claimed in claim 1, characterized in that, The projection of the sound-emitting part onto the reference plane has a major axis direction. Along the major axis direction, the first projection has two endpoints that are furthest apart. A line segment of the first feature line segment that passes through the midpoint of the two endpoints divides the first projection into two parts. The area enclosed by the part closer to the second projection has a first area, and the area enclosed by the other part farther from the second projection has a second area. The first area is smaller than the second area.

11. The acoustic device as claimed in claim 1, characterized in that, The projection of the sound-emitting part onto the reference plane has a major axis direction, and along the major axis direction, the first projection has two endpoints that are furthest apart, with a distance of 4mm-6mm between the two endpoints.

12. An acoustic device, characterized in that, include: A sound-generating part includes a housing and a diaphragm housed within the housing, the diaphragm being configured to generate sound by vibration; The suspension structure is configured to place the sound-producing part near the user's ear canal without obstructing the ear canal, wherein... In the wearing state, the inner side of the housing facing the user's auricle has a sound outlet, which is configured to exhaust sound generated by the front side of the diaphragm through the housing; the other sides of the housing, excluding the inner side, have pressure relief holes, which are configured to exhaust sound generated by the rear side of the diaphragm through the housing; wherein... The pressure relief hole includes an effective vent port, which has a first projection on a reference plane. The reference plane is parallel or tangent to the side where the effective vent port is located. The first projection defines multiple parallel second feature line segments that are perpendicular to the inner side and whose ends are both located within the contour of the first projection. The sound outlet hole has a second projection on the reference plane. The endpoint of any second feature line segment that is closer to the center of the second projection is another reference point. The plurality of 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 plurality of second feature 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. The third length is less than the fourth length.

13. The acoustic device as claimed in claim 12, characterized in that, The projection of the sound-emitting part onto the reference plane has a major axis direction, and along the major 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 as claimed in claim 12, characterized in that, The projection of the sound-emitting part onto the reference plane has a major axis direction. The first projection includes a first side parallel to the major axis direction and a second side opposite to the first side. The third reference point and the fourth reference point are both located on the first side.

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