An acoustic output device

Abstract

The embodiment of the specification provides an acoustic output device, comprising: a low-frequency acoustic unit; a high-frequency acoustic unit; a shell configured to at least carry the low-frequency acoustic unit and the high-frequency acoustic unit, the shell comprising a projection area and a non-projection area of the high-frequency acoustic unit on an inner side surface of the shell; and a support structure connected with the shell and configured to wear the shell at a position near an ear canal but not blocking an ear canal opening, so that at least part of the shell extends into a concha cavity of a user and forms a cavity-like body with the concha cavity; wherein the shell is provided with at least two sound guide holes, a first sound guide hole and a second sound guide hole in the at least two sound guide holes are respectively acoustically coupled with both sides of a diaphragm of the low-frequency acoustic unit, the first sound guide hole is arranged on the inner side surface, and one sound guide hole in the at least two sound guide holes is acoustically coupled with one side of a diaphragm of the high-frequency acoustic unit, in a wearing state, the sound guide hole corresponding to the high-frequency acoustic unit faces the ear canal of the user.

Description

Cross-references

[0001] This application is a divisional application of Chinese application filed on December 15, 2023, with application number 202311743604.0 and entitled "An Acoustic Output Device", which is incorporated herein by reference in its entirety. Technical Field

[0002] This specification relates to the field of acoustics, and in particular to an acoustic output device. Background Technology

[0003] With the development of acoustic output technology, acoustic devices (such as headphones) 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. According to the way users wear them, acoustic devices can generally be divided into over-ear, ear-hook, and in-ear types. Traditional in-ear or over-ear headphones cover or block the user's ear canal, affecting the user's experience in some scenarios, such as running, cycling, or swimming, making it difficult for users to hear external sounds clearly, and prolonged wear can also cause discomfort. Meanwhile, the frequency response curve of current open-back headphones has a larger attenuation in the mid-to-high frequency range (such as the frequency range after 8kHz), resulting in a muffled mid-to-high frequency sound and poor output effect.

[0004] Therefore, it is necessary to provide an acoustic output device with better output performance. Summary of the Invention

[0005] One embodiment of this specification provides an acoustic output device, comprising: a low-frequency acoustic unit; a high-frequency acoustic unit; a housing configured to at least support the low-frequency acoustic unit and the high-frequency acoustic unit; and a support structure configured to place the housing near the ear canal without blocking the ear canal opening; wherein the housing is provided with at least two sound guide holes, a first sound guide hole and a second sound guide hole of the at least two sound guide holes being acoustically coupled to both sides of the diaphragm of the low-frequency acoustic unit, and the low-frequency acoustic unit radiating sound to the outside of the housing through the first sound guide hole and the second sound guide hole; one of the at least two sound guide holes being acoustically coupled to one side of the diaphragm of the high-frequency acoustic unit, and the high-frequency acoustic unit radiating sound to the outside of the housing through the one sound guide hole, wherein, in the wearing state, the sound guide hole corresponding to the high-frequency acoustic unit faces the user's ear canal. By setting up a high-frequency acoustic unit and directing its sound guide hole toward the user's ear canal, the volume of high-frequency (e.g., above 8kHz) sound in the user's ear canal can be increased, compensating for the insufficient output of the acoustic output device in the mid-to-high frequency range (e.g., above 8kHz), so that the acoustic output device has a good acoustic output effect across the entire frequency range.

[0006] In some embodiments, the sound guide hole is a third sound guide hole; the low-frequency acoustic unit radiates sound to the outside of the housing through the first sound guide hole and the second sound guide hole; the high-frequency acoustic unit radiates sound to the outside of the housing through the third sound guide hole; the first sound guide hole, the second sound guide hole and the third sound guide hole are respectively arranged at different positions on the housing, thereby reducing the design difficulty of the third sound guide hole facing the user's ear canal opening, and also making the placement position of the high-frequency acoustic unit more flexible.

[0007] In some embodiments, the third sound guide hole is closer to the user's ear canal than the first and second sound guide holes, thereby allowing more high-frequency sounds to be received at the user's ear canal opening, ensuring a sufficiently high sound pressure level at the user's ear canal opening, and thus guaranteeing high-frequency listening performance. The housing includes an inner side surface that faces the front outer side of the user's ear when worn, and both the first and third sound guide holes are located on the inner side surface, allowing the first and third sound guide holes to be close to the user's ear canal, thereby increasing the listening volume at the user's ear canal opening.

[0008] In some embodiments, the housing includes an inner surface opposite the front outer surface of the user's ear when worn. The sound guide hole is the first sound guide hole, which is acoustically coupled to one side of the diaphragm of the low-frequency acoustic unit and one side of the diaphragm of the high-frequency acoustic unit. The first sound guide hole is located on the inner surface, and the low-frequency acoustic unit and the high-frequency acoustic unit radiate sound into the user's ear canal through the first sound guide hole. This configuration simplifies the structure and reduces the difficulty of manufacturing and design. Simultaneously, it ensures that the first sound guide hole of the low-frequency acoustic unit and the corresponding sound guide hole of the high-frequency acoustic unit are on the same plane, meaning the high-frequency acoustic unit can be embedded within the corresponding inner surface of the housing. Because the high-frequency acoustic unit is embedded within the housing, it does not protrude from the surface of the housing, resulting in a flat surface and a more aesthetically pleasing shape.

[0009] In some embodiments, the overlap ratio between the projected area of ​​the high-frequency acoustic unit on the inner side of the housing and the projected area of ​​the first sound guide hole of the low-frequency acoustic unit on the inner side does not exceed 10%, thereby avoiding the high-frequency acoustic unit from blocking the first sound guide hole and ensuring the user's low-frequency listening volume.

[0010] In some embodiments, the centroid of the projection of the high-frequency acoustic unit onto the inner side of the housing is closer to the connection between the support structure and the housing than the centroid of the projection of the low-frequency acoustic unit onto the first sound guide hole on the inner side. This makes the sound guide hole (e.g., the third sound guide hole) corresponding to the high-frequency acoustic unit closer to the user's ear canal than the first sound guide hole of the low-frequency acoustic unit on the inner side, thereby ensuring high-frequency listening performance.

[0011] In some embodiments, when worn, the end of the housing away from the connection point extends into the user's concha. The housing includes a minor axis and a major axis. In the minor axis direction, the centroid of the projection of the high-frequency acoustic unit onto the inner surface is closer to the upper surface of the housing than the centroid of the projection of the low-frequency acoustic unit onto the first sound guide hole on the inner surface. This prevents the high-frequency acoustic unit from blocking the first sound guide hole in the aforementioned wearing state, thus avoiding a reduction in the sound output by the low-frequency acoustic unit through the first sound guide hole, which would affect the low-frequency listening volume in the user's ear canal.

[0012] In some embodiments, the high-frequency acoustic unit is located on the lower side of the housing, or at the junction of the lower side and the inner side of the housing; in the wearing state, the housing at least partially covers the user's antihelix area. Because the inner and lower sides of the housing are close to the user's ear canal in the aforementioned wearing state, this arrangement allows the sound guide hole (e.g., the third sound guide hole) of the high-frequency acoustic unit to be better directed towards the user's ear canal, increasing the high-frequency listening volume in the user's ear canal and compensating for the insufficient output of the acoustic output device in the mid-to-high frequency range (e.g., the frequency band greater than 8kHz), resulting in good acoustic output performance across the entire frequency range.

[0013] In some embodiments, the angle between the vibration direction of the high-frequency acoustic unit and the vibration direction of the low-frequency acoustic unit is in the range of 36°-54°. This ensures that while the vibration direction of the high-frequency acoustic unit is oriented towards the user's ear canal, the vibration direction of the low-frequency acoustic unit is perpendicular or approximately perpendicular to the inner or outer surface. This results in the diaphragm of the low-frequency acoustic unit having a larger size and vibration space, ensuring that the acoustic output device has a better sound leakage reduction effect while also having a better acoustic output effect across the entire frequency band.

[0014] In some embodiments, the inner surface of the housing includes a projected area and a non-projected area for the high-frequency acoustic unit, and the projected area protrudes beyond the non-projected area in the thickness direction of the housing. This configuration allows the acoustic output device to adapt to more user ear shapes, making it easier for the high-frequency acoustic unit to approach the user's ear canal, thereby improving the user's listening volume.

[0015] In some embodiments, in the thickness direction of the housing, the height difference between the projected area and the non-projected area is not less than 0.6 mm; or, the ratio of the height difference between the projected area and the non-projected area to the thickness of the housing is greater than 0.05. With the above settings, the degree to which the high-frequency acoustic unit protrudes from the housing can be designed, enabling the acoustic output device to have better acoustic output performance at high frequencies while ensuring the user's listening volume.

[0016] In some embodiments, the inner surface of the housing includes a projection area and a non-projection area for a high-frequency acoustic unit, the projection area and the non-projection area being flush, so as to improve the acoustic output performance of the acoustic output device at high frequencies while reducing the loss of high-frequency sound waves.

[0017] In some embodiments, the inner surface of the housing includes a projection area and a non-projection area for a high-frequency acoustic unit. The ratio of the height difference between the projection area and the non-projection area in the thickness direction of the housing to the thickness of the housing is less than 0.3, so that the projection area and the non-projection area are flush or nearly flush, thereby improving the acoustic output performance of the acoustic output device at high frequencies and increasing the user's listening volume.

[0018] In some embodiments, the minimum resonant frequency corresponding to the high-frequency acoustic unit is not lower than 5kHz, and the minimum resonant frequency corresponding to the low-frequency unit is not higher than 1kHz. Through the above settings, the low-frequency acoustic unit can have a large output in the low-to-mid frequency range (e.g., 1kHz-8kHz), while the high-frequency acoustic unit can have a large output in the high-frequency range (e.g., above 8kHz), thereby enabling the acoustic output device to have good acoustic output performance across the entire frequency band (e.g., above 1kHz).

[0019] One embodiment of this specification also provides an acoustic output device, comprising: a low-frequency acoustic unit; a high-frequency acoustic unit; a housing configured to at least support the low-frequency acoustic unit and the high-frequency acoustic unit; and a support structure configured to place the housing near the ear canal without blocking the ear canal opening; wherein, the housing is provided with at least two sound guide holes, and the low-frequency acoustic unit and the high-frequency acoustic unit radiate sound to the outside of the housing through one or more of the at least two sound guide holes; the housing includes an inner side facing the front outer side of the user's ear when worn, one of the at least two sound guide holes is located on the inner side and acoustically communicates with the low-frequency acoustic unit, and in the wearing state, the sound guide hole corresponding to the high-frequency acoustic unit faces the user's ear canal; the overlap ratio between the projected area of ​​the high-frequency acoustic unit on the inner side of the housing and the projected area of ​​the sound guide hole of the low-frequency acoustic unit on the inner side of the housing does not exceed 10%. With the above settings, the sound guide hole of the high-frequency acoustic unit can be oriented towards the user's ear canal, while avoiding the high-frequency acoustic unit blocking the sound guide hole on the inner side of the low-frequency acoustic unit. This ensures the user's low-frequency listening volume while enabling the acoustic output device to have a good acoustic output effect across the entire frequency range. Attached Figure Description

[0020] 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: Figure 1 This is a schematic diagram of an exemplary auricle according to some embodiments of this application; Figure 2 This is an exemplary frame diagram of an acoustic output device according to some embodiments of this specification; Figure 3 This is an exemplary wearing diagram of an acoustic output device according to some embodiments of this specification; Figure 4 This is a schematic diagram of the interior of the housing according to some embodiments of this specification; Figure 5A These are schematic diagrams of the frequency response curves of the acoustic output device under different conditions, based on some embodiments of this specification. Figure 5B yes Figure 5A A magnified schematic diagram of the mid-to-high frequency curves; Figure 6 This is a schematic diagram of the external outline of the housing according to some embodiments of this specification; Figures 7A-7C This is a schematic diagram showing the positions of the first and third sound guide holes according to some embodiments of this specification; Figure 8 This is a schematic diagram illustrating the wearing of an acoustic output device, as shown in some embodiments of this specification, with the housing extending into the concha cavity; Figure 9 This is a schematic diagram of an acoustic model formed according to some embodiments of the acoustic output device shown in this specification; Figure 10 This is a schematic diagram of the frequency response curves of the acoustic output device corresponding to different installation positions of the high-frequency acoustic unit as shown in some embodiments of this specification; Figure 11 This is an exemplary wearing diagram of an acoustic output device according to other embodiments of this specification; Figure 12 This is a schematic diagram of an acoustic model formed according to some embodiments of the acoustic output device shown in this specification; Figure 13 This is a schematic diagram showing the position of the acoustic output device relative to the ear according to some embodiments of this specification; Figure 14 This is a schematic diagram of the distribution of high-frequency sound waves when the high-frequency acoustic unit protrudes from the housing according to some embodiments of this specification; Figure 15This is a schematic diagram showing the distribution of high-frequency sound waves when a high-frequency acoustic unit is embedded in a housing, according to some embodiments of this specification. Figure 16 This is a schematic diagram showing the directivity of the high-frequency acoustic unit when the high-frequency acoustic unit and the housing are in different positions, according to some embodiments of this specification; Figure 17 This is a schematic diagram of the frequency response curves of the high-frequency acoustic unit when the high-frequency acoustic unit and the housing are in different positions, according to some embodiments of this specification; Figures 18A-18D This is a schematic diagram of the housing at different positions of the high-frequency acoustic unit according to some embodiments of this specification; Figure 19A This is a schematic diagram of the frequency response curves of the acoustic output device corresponding to the high-frequency acoustic unit being disposed in different positions according to some embodiments of this specification; Figure 19B yes Figure 19A A magnified schematic diagram of the mid-to-high frequency curves. Detailed Implementation

[0021] 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. It should be understood that these exemplary embodiments are given merely to enable those skilled in the art to better understand and implement this specification, and are not intended to limit the scope of this specification in any way. Unless obvious from the linguistic context or otherwise, the same reference numerals in the figures represent the same structures or operations.

[0022] As indicated in this specification and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" are not specifically singular and may include plural forms. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. The term "based on" means "at least partially based on." The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment."

[0023] In the description of this specification, it should be understood that the terms "front", "rear", "ear hook", "rear hook", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this specification and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this specification.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this specification, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] In this specification, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this specification according to the specific circumstances.

[0026] This specification provides an acoustic output device, including a housing and a support structure. The support structure allows the housing to be worn near the user's ear canal without blocking the ear canal opening, thus keeping the user's ear canal open and enabling the user to receive external sounds during use, improving the user experience. The housing houses a low-frequency acoustic unit and a high-frequency acoustic unit. The housing has at least two sound guide holes. Two of the sound guide holes (e.g., a first sound guide hole and a second sound guide hole) are acoustically coupled to both sides of the diaphragm of the low-frequency acoustic unit, allowing the low-frequency acoustic unit to radiate sound to the outside of the housing through the two sound guide holes. One of the sound guide holes is acoustically coupled to one side of the diaphragm of the high-frequency acoustic unit, allowing the high-frequency acoustic unit to radiate sound to the outside of the housing through the one sound guide hole. When worn, the sound guide hole corresponding to the high-frequency acoustic unit faces the user's ear canal. By setting up a high-frequency acoustic unit and directing its sound guide hole toward the user's ear canal, the volume of high-frequency (e.g., above 8kHz) sound in the user's ear canal can be increased, compensating for the insufficient output of the acoustic output device in the mid-to-high frequency range (e.g., above 8kHz), so that the acoustic output device has a good acoustic output effect across the entire frequency range.

[0027] Figure 1This is a schematic diagram of an exemplary auricle according to some embodiments of this application. See also Figure 1 The auricle 100 may include an ear canal 101, a concha 102, a cymba concha 103, a triangular fossa 104, an antihelix 105, a scaphoid fossa 106, an helix 107, an earlobe 108, and a crus of the helix 109. It should be noted that, for ease of description, in the embodiments of this specification, the upper crus 1011 and lower crus 1012 of the antihelix and the antihelix 105 are collectively referred to as the antihelix region. In some embodiments, the wearing and stabilization of an acoustic device can be achieved using one or more parts of the auricle 100. In some embodiments, the ear canal 101, the concha 102, the cymba concha 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) can be worn in the ear canal 101. In some embodiments, the wearing of an acoustic device can be achieved using other parts of the auricle 100 besides the ear canal 101. For example, the acoustic device can be worn using parts such as the cymba conchae 103, triangular fossa 104, antihelix 105, scaphoid 106, and helix 107, or combinations thereof. In some embodiments, to improve the comfort and reliability of the acoustic device during wear, it can also be further utilized using parts such as the user's earlobe 108. By utilizing parts of the auricle 100 other than the ear canal 101 to achieve the wearing of the acoustic device and the propagation of sound, the user's ear canal 101 can be "liberated," reducing the impact of the acoustic device on the user's ear health. When a user wears the acoustic device on the road, the acoustic device will not block the user's ear 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 a user wears the acoustic device, the entire or part of the acoustic device can be located on the front side of the helix crus 109 (e.g., Figure 1 The area M3 enclosed by the dashed line. For example, when a user wears the acoustic device, the entirety or part of the acoustic device may contact the upper part of the ear 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 106, and helix 107). For yet another example, when a user wears the acoustic device, the entirety or part of the acoustic device may be located within one or more parts of the auricle (e.g., the cavity of the concha 102, cymba conchae 103, triangular fossa 104, etc.). Figure 1 The region M1, enclosed by the dashed line, includes at least the cymba conchae 103 and the triangular fossa 104, and the region M2, which includes at least the cavum conchae 102.

[0028] Individual differences may exist among users, resulting in variations in the shape, size, and other dimensions of the auricle 100. For ease of description and understanding, unless otherwise specified, this specification will primarily use an auricle model with a "standard" shape and size as a reference to further describe the wearing method of the acoustic device on this auricle model in different embodiments. For example, a simulator containing a head and its (left and right) auricles 100, manufactured based on ANSI:S3.36, S3.25 and IEC:60318-7 standards, such as the GRAS45BCKEMAR, can be used as a reference for wearing the acoustic device, thus representing the scenario of most users normally wearing the acoustic device. In this application, descriptions such as "user wearing," "in wearing state," and "under wearing state" can refer to the acoustic device described in this application being worn on the auricle 100 of the aforementioned simulator. Of course, considering individual differences among users, the structure, shape, size, thickness, etc. of one or more parts of the auricle 100 can be differentiated according to different shapes and sizes of auricles 100. These differentiated designs can be manifested in the characteristic parameters of one or more parts of the acoustic device (e.g., the shell, support structure, etc. mentioned below) having different ranges of values, so as to adapt to different auricles 100. In addition, it should be noted that: "non-wearing state" is not limited to the state in which the headphones are not worn on the user's auricle 100, but also includes the state in which the headphones are not deformed by external force; "wearing state" is not limited to the state in which the headphones are worn on the user's auricle 100. The support structure and the shell being positioned in the same state as when wearing (e.g., maintaining the corresponding distance between each structure) can also be regarded as the wearing state.

[0029] 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 "anterior side of the auricle" mentioned in this application is a concept relative to "posterior side of the auricle." The former refers to the side of the auricle away from the head, while the latter refers to the side of the auricle facing the head; both refer to the user's auricle. Specifically, by observing the auricle of the simulator along the direction of the human coronal axis, one can obtain... Figure 1 The diagram shows the anterior contour of the auricle.

[0030] The description of the auricle 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 ear canal 101. These changes and modifications are still within the protection scope of this application.

[0031] Figure 2 This is an exemplary frame diagram of an acoustic output device according to some embodiments of this specification. Figure 3 This is an exemplary wearing diagram of an acoustic output device according to some embodiments of this specification.

[0032] In some embodiments, the acoustic output device 10 may include glasses, smart bracelets, headphones, hearing aids, smart helmets, smartwatches, smart clothing, smart backpacks, smart accessories, etc., or any combination thereof. For example, the acoustic output device 10 may be functional glasses for nearsightedness, reading glasses, cycling glasses, or sunglasses, or it may be intelligent glasses, such as audio glasses with headphone functionality. The acoustic output device 10 may also be a head-mounted device such as a helmet, augmented reality (AR) device, or virtual reality (VR) device. In some embodiments, the augmented reality device or virtual reality device may include a virtual reality helmet, virtual reality glasses, augmented reality helmet, augmented reality glasses, etc., or any combination thereof. For example, virtual reality devices and / or augmented reality devices may include Google Glass, Oculus Rift, HoloLens, Gear VR, etc.

[0033] Please refer to Figure 2 and Figure 3 In some embodiments, the acoustic output device 10 may include a housing 11, a support structure 12, a low-frequency acoustic unit 13, and a high-frequency acoustic unit 14. The support structure 12 is connected to the housing 11, and both the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 are disposed on the housing 11. The low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 cooperate to realize the acoustic output of the acoustic output device 10.

[0034] The housing 11 is connected to the support structure 12 and is used to support the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14. In some embodiments, the housing 11 may be a hollow, closed housing structure, with the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 located inside the housing 11. In some embodiments, the acoustic output device 10 may be integrated with products such as glasses, headphones, head-mounted displays, and AR / VR helmets. In this case, the housing 11 may be fixed near the user's ear 100 by suspension or clamping. In some alternative embodiments, the housing 11 may be provided with a suspension structure (e.g., a hook). For example, the shape of the hook matches the shape of the ear, and the acoustic output device 10 can be worn independently on the user's ear 100 via the hook.

[0035] In some embodiments, the housing 11 can be a housing structure with a shape adapted to the human ear 100, such as a ring, ellipse, racetrack shape, polygon (regular or irregular), U-shape, V-shape, semi-circle, or other regular or irregular shapes, so that the housing 11 can be directly attached to the user's ear 100. In some embodiments, the housing 11 may also include a fixing structure. The fixing structure may include ear hooks, elastic bands, etc., so that the acoustic output device 10 can be better worn by the user and prevent it from falling off during use.

[0036] In some embodiments, the housing 11 may have a major axis direction X, a minor axis direction Y, and a thickness direction Z that are orthogonal to each other. The major axis direction X can be defined as the direction in which the two-dimensional projection plane of the housing 11 has a larger extension dimension (e.g., the projection of the housing 11 onto the plane containing its inner side surface (the side closest to the auricle 100), or its projection onto the sagittal plane). For ease of explanation, this specification will use the projection of the housing onto the sagittal plane as an example. The minor axis direction Y can be defined as the direction perpendicular to the major axis direction X in the shape of the projection of the housing 11 onto the sagittal plane (e.g., the minor axis direction is the width direction of the rectangle or approximate rectangle when the projection shape is rectangular or approximate). The thickness direction Z can be defined as a direction perpendicular to the sagittal plane, for example, consistent with the direction of the coronal axis, both pointing towards the left and right sides of the body.

[0037] Combination Figure 1 , Figure 2 and Figure 3 In some embodiments, when the user wears the acoustic output device 10, at least a portion of the housing 11 may be located in... Figure 1 The diagram shows the region M3 on the front side of the tragus of the user's ear 100, or the regions M1 and M2 on the anterior lateral side of the auricle. It should be noted that, in the embodiments of this specification, the anterior lateral side of the auricle refers to the side of the auricle facing away from the head along the coronal axis; correspondingly, the posteromedial side of the auricle refers to the side of the auricle facing the head along the coronal axis. In some embodiments, the housing 11 may have at least two sound guide holes for transmitting sound. In some embodiments, two of the at least two sound guide holes are acoustically coupled to both sides of the diaphragm of the low-frequency acoustic unit 13, and the low-frequency acoustic unit 13 radiates sound to the outside of the housing 11 through the two sound guide holes. One of the at least two sound guide holes is acoustically coupled to one side of the diaphragm of the high-frequency acoustic unit 14, and the high-frequency acoustic unit 14 radiates sound to the outside of the housing 11 through the one sound guide hole. When worn, the sound guide hole corresponding to the high-frequency acoustic unit 14 faces the user's ear canal.

[0038] In some embodiments, when worn, the housing 11 may be located on the side of the user's ear facing the facial area along the sagittal axis, i.e. Figure 3 The position of the solid line frame A. At this time, the housing 11 is located in the facial region M3 in front of the user's ear. The major axis of the housing 11 can be vertical or approximately vertical. The projection of the minor axis direction Y onto the sagittal plane is consistent with the direction of the sagittal axis. The projection of the major axis direction X onto the sagittal plane is consistent with the direction of the vertical axis. The thickness direction Z is perpendicular to the sagittal plane. In some embodiments, when worn, the housing 11 is in an inclined state (e.g., Figure 3 When the position is shown in the dashed box B, the major axis X and minor axis Y are still parallel or approximately parallel to the sagittal plane. The major axis X can have a certain angle with the direction of the sagittal axis, that is, the major axis X is also set accordingly at an angle. The minor axis Y can have a certain angle with the direction of the vertical axis, that is, the minor axis Y is also set at an angle. The thickness direction Z is perpendicular to the sagittal plane. At this time, the acoustic output device 10 is located in the area where M2 is located. Since the concha 102 has a certain volume and depth, there is a certain gap between the inner surface of the acoustic output device 10 and the concha. The ear canal can be connected to the outside through the leakage structure between the inner surface and the concha, thereby relieving the user's ears. At the same time, the housing 11 of the acoustic output device 10 and the concha can cooperate to form an auxiliary cavity that communicates with the ear canal. In some embodiments, at least one sound guide hole may be at least partially located within the aforementioned auxiliary cavity. The sound emitted through this sound guide hole is limited by the aforementioned auxiliary cavity, meaning the auxiliary cavity can converge the sound, allowing more sound to propagate into the ear canal, thereby improving the volume and quality of the sound heard by the user in the near field, and thus improving the acoustic effect of the acoustic output device 10. In some embodiments, the housing 11 may also be in a horizontal or near-horizontal state when worn, such as... Figure 3 As shown in the dashed box C, the shell 11 is at least partially located at the antihelix 105. The major axis X of the shell 11 can be aligned with or approximately aligned with the sagittal axis, both pointing in the anterior-posterior direction of the body. The minor axis Y can be aligned with or approximately aligned with the vertical axis, both pointing in the vertical direction of the body. The thickness direction Z is perpendicular to the sagittal plane. This design avoids the shell 11 obstructing the ear canal, thus freeing the user's ears; it also increases the contact area between the shell 11 and the auricle 100, thereby improving the wearing comfort of the earphone 10. It should be noted that when worn, the shell 11 at the position shown in the dashed box C is in an approximately horizontal state, which means... Figure 3 The angle between the major axis X and the sagittal axis of the housing 11, as shown in the dashed box C, is within a specific range (e.g., no greater than 20°). Furthermore, the wearing position of the housing 11 is not limited to... Figure 3 The positions A, B, C, etc. shown satisfy the following conditions: Figure 1Regions M3, M1, or M2 as shown are acceptable. For example, the entire or part of the structure of the shell 11 can be located in... Figure 1 The area M3 is enclosed by the dashed line. For example, the entirety or part of the shell 11 may contact the upper part of the ear canal 101 (e.g., the location of one or more parts such as the helix crus 109, cymba conchae 103, triangular fossa 104, antihelix 105, scaphoid fossa 106, helix 107, etc.). For yet another example, the entirety or part of the shell 11 may be located within the cavity formed by one or more parts of the auricle 100 (e.g., the conchae cavity 102, cymba conchae 103, triangular fossa 104, etc.). Figure 1 The region M1, enclosed by the dashed line, includes at least the cymba conchae 103 and the triangular fossa 104, and the region M2, which includes at least the cavum conchae 102.

[0039] In some embodiments, the support structure 12 is configured to place the housing 11 near the user's ear canal without blocking the ear canal opening, keeping the user's auricle 100 open so that the user can hear the sound output by the acoustic output device 10 while also receiving sounds from the external environment. For example, the acoustic output device 10 can be arranged around or partially around the user's auricle 100 and can transmit sound through air conduction or bone conduction. In some embodiments, the support structure 12 can also vary depending on the type of acoustic output device 10. For example, when the acoustic output device 10 is an earphone, the support structure 12 can be an ear hook; when the acoustic output device 10 is eyeglasses, the support structure 12 can be a temple; when the acoustic output device 10 is a wristband, the support structure 12 can be a strap; when the acoustic output device 10 is a head-mounted device, the support structure 12 can be a helmet, etc.

[0040] In some embodiments, taking an open-back headphone as an example, the corresponding support structure 12 can be an ear hook. The ear hook can include a first part 121 and a second part 122, which are connected in sequence. In the wearing state, the first part 121 of the support structure 12 is hung between the user's auricle and head, and the second part 122 extends towards the side of the auricle away from the head and connects to the shell 11, so that the shell 11 is worn near the ear canal but does not block the ear canal.

[0041] In some embodiments, to improve the stability of the acoustic output device 10 in the wearing state, the acoustic output device 10 may employ any one or a combination of the following methods. First, at least a portion of the support structure 12 is configured as a conformal structure that conforms to at least one of the posterior side of the auricle 100 and the head, thereby increasing the contact area between the support structure 12 and the auricle 100 and / or the head, thus increasing the resistance to the acoustic output device 10 falling off the auricle 100. Second, at least a portion of the support structure 12 is configured as an elastic structure, allowing it to have a certain deformation in the wearing state, thereby increasing the positive pressure of the support structure 12 on the auricle 100 and / or the head, thus increasing the resistance to the acoustic output device 10 falling off the auricle 100. Third, at least a portion of the support structure 12 is configured to rest against the head in the wearing state, creating a reaction force that presses against the auricle 100, so that the housing 11 is pressed against the anterior outer surface of the auricle 100 (e.g., Figure 1 The regions M1 and M2 shown in the diagram increase the resistance to the acoustic output device 10 falling off the auricle 100. Fourth, the housing 11 and the support structure 12 are configured to clamp the region where the antihelix 105 and the concha cavity are located from the front outer side and the back inner side of the auricle 100 when worn, thereby increasing the resistance to the acoustic output device 10 falling off the auricle 100. Fifth, the housing 11 or the auxiliary structure connected thereto is configured to at least partially extend into the cavities such as the concha cavity 102, the cymba conchae 103, the triangular fossa 104, and the scaphoid fossa 106, thereby increasing the resistance to the acoustic output device 10 falling off the auricle 100.

[0042] In some embodiments, the support structure 12 may have an arcuate structure adapted to the junction of the user's head and auricle 100, so that the support structure 12 can be hung between the user's auricle 100 and head. Exemplarily, the first portion 121 of the support structure 12 connects the second portion 122 to the housing 11, such that the acoustic output device 10 is curved in three-dimensional space when in a non-wearing state (i.e., a natural state). In other words, in three-dimensional space, the second portion 122, the first portion 121, and the housing 11 are not coplanar. This arrangement ensures that when the acoustic output device 10 is worn, the second portion 122 can be hung between the back of the user's auricle 100 and head, and the housing 11 is hung between the front of the user's auricle 100 (e.g., ...). Figure 1 The area M3) or auricle 100 (e.g., Figure 1The housing 11 and the second part 122 can cooperate to clamp the auricle 100 in contact with the areas M1 and M2 in the ear canal. Specifically, the first part 121 can extend from the head to the outside of the head and cooperate with the second part 122 to provide the housing 11 with a pressing force on the front of the auricle 100 or the auricle 100. Under the action of the pressing force, the housing 11 can press against the front of the auricle 100 or the area where the concha 102, cymba concha 103, triangular fossa 104, antihelix 105, etc. are located, so that the acoustic output device 10 does not cover the ear canal 101 of the auricle 100 when it is worn.

[0043] In some embodiments, the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 can be used to convert a signal containing sound information into a sound signal. In some embodiments, the sound signal may include bone conduction sound waves or air conduction sound waves. For example, the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 can generate mechanical vibrations to output sound waves (i.e., sound signals) in response to receiving a signal containing sound information. In some embodiments, the low-frequency acoustic unit 13 refers to an acoustic transducer with good acoustic output performance in the low-frequency range, so that the acoustic output device 10 has good low-frequency output performance; the high-frequency acoustic unit 14 refers to an acoustic transducer with good acoustic output performance in the high-frequency range, so as to improve the high-frequency output performance of the acoustic output device 10. Here, the low-frequency range may refer to a frequency range less than 8 kHz, and the high-frequency range may refer to a frequency range greater than 8 kHz. In some embodiments, the low-frequency range and the high-frequency range may also have different standards based on actual conditions. For example, the low frequency range can also refer to the frequency range not higher than 1kHz, such as 1Hz-1kHz, 100Hz-800Hz, etc.; the high frequency range can also refer to the frequency range not lower than 5kHz, such as 5kHz-10kHz, 8kHz-16kHz, etc.

[0044] In some embodiments, depending on the working principle, the types of the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 may include, but are not limited to, dynamic transducers, moving-iron transducers, planar transducers, and piezoelectric transducers. Dynamic transducers have high transduction efficiency, high sensitivity, and good overall sound quality, but their output performance in the high-frequency range is poor. Moving-iron transducers have high sensitivity, but their frequency response curve has a small flat range, and their structure is complex, costly, and long, making design difficult. Piezoelectric transducers have high transduction efficiency and high sensitivity, but require high voltage to drive the piezoelectric element, and their frequency response curve is not flat at high frequencies, with large peaks and troughs in the vibration modes. Planar transducers have more uniform stress on the diaphragm, better avoiding the generation of segmented vibrations, thus better avoiding distortion of the output sound, and providing better output performance in the high-frequency range.

[0045] Based on the foregoing analysis, in some embodiments, the low-frequency acoustic unit 13 may employ a moving-coil transducer to enable the low-frequency acoustic unit 13 to have better acoustic output in the low-frequency range. In some embodiments, the high-frequency acoustic unit 14 may employ a planar transducer to enable the high-frequency acoustic unit 14 to have better acoustic output in the high-frequency range.

[0046] In some embodiments, the minimum resonant frequency corresponding to the high-frequency acoustic unit 14 is not lower than 5kHz, and the minimum resonant frequency corresponding to the low-frequency acoustic unit 13 is not higher than 1kHz. Through the above configuration, the low-frequency acoustic unit 13 can have a large output in the mid-low frequency range (e.g., 1kHz-8kHz), while the high-frequency acoustic unit 14 can have a large output in the high frequency range (e.g., above 8kHz), thereby enabling the acoustic output device 10 to have good acoustic output performance across the entire frequency band (e.g., above 1kHz).

[0047] In some embodiments, to ensure that the acoustic output device 10 has a high acoustic output effect over a wide frequency range, the difference between the minimum resonant frequency of the high-frequency acoustic unit 14 and the minimum resonant frequency of the low-frequency acoustic unit 13 may be no less than 4 kHz, or the ratio of the minimum resonant frequency of the high-frequency acoustic unit 14 to the minimum resonant frequency of the low-frequency acoustic unit 13 may be no less than 5. In some embodiments, to further ensure that the acoustic output device 10 has a high acoustic output effect in the mid-low frequency range, the minimum resonant frequency corresponding to the low-frequency acoustic unit 13 may be relatively small, and the difference between the minimum resonant frequency of the high-frequency acoustic unit 14 and the minimum resonant frequency of the low-frequency acoustic unit 13 may be no less than 6 kHz, or the ratio of the minimum resonant frequency of the high-frequency acoustic unit 14 to the minimum resonant frequency of the low-frequency acoustic unit 13 may be no less than 10. In some embodiments, in order to further enable the acoustic output device 10 to have a high acoustic output effect in the high frequency range, the minimum resonant frequency corresponding to the high frequency acoustic unit 14 can be large, the difference between the minimum resonant frequency of the high frequency acoustic unit 14 and the minimum resonant frequency of the low frequency acoustic unit 13 can be not less than 8kHz, or the ratio of the minimum resonant frequency of the high frequency acoustic unit 14 to the minimum resonant frequency of the low frequency acoustic unit 13 can be not less than 20.

[0048] Figure 4 This is a schematic diagram of the interior of the housing according to some embodiments shown in this specification. Figure 5A These are schematic diagrams of the frequency response curves of the acoustic output device under different conditions, based on some embodiments of this specification. Figure 5B yes Figure 5A A magnified schematic diagram of mid-to-high frequency curves. (See attached image.) Figure 5A and Figure 5B As shown, curve L 52This represents the frequency response curve of the acoustic output device 10 when only the low-frequency acoustic unit 13 is working. Curve L 53 This represents the frequency response curve of the acoustic output device 10 when only the high-frequency acoustic unit 14 is working. Curve L 54 This represents the frequency response curve of the acoustic output device 10 when the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 operate simultaneously. In some embodiments, such as... Figure 4 As shown, the low-frequency acoustic unit 13 can be disposed within the housing 11, and the high-frequency acoustic unit 14 can be disposed within the housing 11 and protrude from the surface of the housing 11. The low-frequency acoustic unit 13 is a moving-coil transducer; the high-frequency acoustic unit 14 is a planar transducer, and the resonant frequency of the high-frequency acoustic unit 14 can be located at 8kHz. The input signal voltages of both the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 are 0.5V, and they are in phase. In some embodiments, Figure 5A and Figure 5B The frequency response curve can be measured using a microphone. The microphone can be positioned 4mm away from the sound guide hole closest to the user's ear canal when worn, with the direction of the sound guide hole pointing towards the user's ear when worn. Specifically, when the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 operate simultaneously, the position of the corresponding sound guide hole can be the midpoint between the sound guide hole closest to the user's ear canal in the low-frequency acoustic unit 13 and the sound guide hole corresponding to the high-frequency acoustic unit 14 (e.g., the midpoint of the line connecting their centers). When the sound guide hole corresponding to the high-frequency acoustic unit 14 completely overlaps with one of the two sound guide holes corresponding to the low-frequency acoustic unit 13, the microphone position is the center of the larger of the two overlapping sound guide holes.

[0049] like Figure 5A and Figure 5B As shown, in the low-frequency range (e.g., below 800 Hz), curve L... 52 With curve L 54 The approximate overlap indicates that the sound from the acoustic output device 10 at low frequencies (e.g., below 800Hz) is primarily output by the low-frequency acoustic unit 13, and the influence of the high-frequency acoustic unit 14 on the low-frequency output of the low-frequency acoustic unit 13 is negligible. Curve L 52 The sharp attenuation starting at 7kHz indicates that the low-frequency acoustic unit 13 has poor output performance in the high-frequency range (e.g., above 8kHz). Curve L 53 The low low-frequency output, followed by a steady increase after 1.2kHz, and maintaining a high level above 7kHz with minimal attenuation, indicates that the high-frequency acoustic unit 14 has good output performance at high frequencies (e.g., above 8kHz). Curve L 54 It can be viewed as curve L 52With curve L 53 The fitted curves are superimposed, and curve L is formed. 53 For curve L 52 Compensation is provided in the attenuation range (e.g., above 7kHz), curve L 54 Before 7kHz, it is basically the same as curve L. 52 Overlapping, curve L 54 After 7kHz, it basically follows curve L. 53 The overlap indicates that adding a high-frequency acoustic unit 14 within the acoustic output device 10 can stably improve the output sound pressure level at high frequencies (e.g., above 8kHz) while ensuring the low-frequency output effect of the acoustic output device 10, thus enabling the acoustic output device 10 to have good output performance across the entire frequency range. Simultaneously, comparing curve L... 54 With curve L 52 It can be seen that in the frequency range above 8kHz, curve L 54 The ratio of curve L 52 The difference of 10dB-15dB indicates that the setting of the high-frequency acoustic unit 14 can increase the output sound pressure level of the acoustic output device 10 at high frequencies (e.g., above 8kHz) by 10dB-15dB, and the high-frequency enhancement effect is very significant.

[0050] In some embodiments, the housing 11 is provided with at least two sound guide holes. Two of the at least two sound guide holes (e.g., the first sound guide hole 111 and the second sound guide hole 112) are acoustically coupled to both sides of the diaphragm of the low-frequency acoustic unit 13, respectively. The low-frequency acoustic unit 13 radiates sound to the outside of the housing 11 through the two sound guide holes (e.g., the first sound guide hole 111 and the second sound guide hole 112). When the low-frequency acoustic unit 13 outputs sound waves, the sound wave on one side of the diaphragm of the low-frequency acoustic unit 13 (or the first sound wave) can be emitted through one of the two sound guide holes, and the sound wave on the other side of the diaphragm of the low-frequency acoustic unit 13 (or the second sound wave) can be emitted through the other of the two sound guide holes. In some embodiments, the two sound guide holes can emit two sets of sound waves with a phase difference (e.g., opposite phases) to form a dipole. The dipole can interfere and cancel each other out at a spatial point (e.g., the far field of the acoustic output device 10), thereby effectively improving the sound leakage problem in the far field of the acoustic output device 10 in the mid-low frequency range (e.g., 100Hz-800Hz).

[0051] In some embodiments, one of the at least two sound guide holes can be acoustically coupled to one side of the diaphragm of the high-frequency acoustic unit 14. The high-frequency acoustic unit 14 radiates sound to the outside of the housing 11 through the one sound guide hole. When worn, the corresponding sound guide hole of the high-frequency acoustic unit 14 faces the user's ear canal. The high-frequency acoustic unit 14 outputs sound waves (or third sound waves) to the outside of the housing 11 through only one sound guide hole, forming a monopole. In some embodiments, in the mid-to-high frequency range (e.g., 800Hz-10kHz), the monopole design makes the high-frequency acoustic unit 14 more directional. Combined with the setting of the corresponding sound guide hole facing the user's ear canal, it can improve the user's hearing effect of the third sound wave output by the high-frequency acoustic unit 14, so that the user's ear canal can receive a larger volume, allowing the user to obtain a clear hearing effect. Through the setting of the high-frequency acoustic unit 14 and its corresponding sound guide hole, the output sound pressure level of the acoustic output device 10 at high frequencies (e.g., 8kHz-16kHz) can be improved, ensuring the full-band output effect of the acoustic output device 10.

[0052] In some embodiments, the sound guide hole corresponding to the high-frequency acoustic unit 14 can be a third sound guide hole (e.g., the third sound guide hole 113) that is different from the two sound guide holes (e.g., the first sound guide hole 111 and the second sound guide hole 112) corresponding to the low-frequency acoustic unit 13. That is, the third sound guide hole (e.g., the third sound guide hole 113) does not overlap with the aforementioned two sound guide holes (e.g., the first sound guide hole 111 and the second sound guide hole 112), thereby making the design position of the third sound guide hole (e.g., the third sound guide hole 113) flexible, improving the installation flexibility of the high-frequency acoustic unit 14, and allowing the third sound guide hole corresponding to the high-frequency unit 14 to be closer to the user's ear canal when worn, ensuring high-frequency output effect. In some embodiments, the sound guide hole corresponding to the high-frequency acoustic unit 14 can also be one of the two sound guide holes (e.g., the first sound guide hole 111 and the second sound guide hole 112) corresponding to the low-frequency acoustic unit 13. That is, the sound guide hole corresponding to the high-frequency acoustic unit 14 can partially or completely overlap with one of the two sound guide holes (e.g., the first sound guide hole 111 and the second sound guide hole 112) corresponding to the low-frequency acoustic unit 13, which simplifies the structural design and ensures the consistency of the output of the high-frequency acoustic unit 14 and the low-frequency acoustic unit 13. In some embodiments, when the sound guide hole corresponding to the high-frequency acoustic unit 14 is a third sound guide hole (e.g., the third sound guide hole 113) that is different from the two sound guide holes (e.g., the first sound guide hole 111 and the second sound guide hole 112) corresponding to the low-frequency acoustic unit 13, the third sound guide hole can not overlap (i.e., no overlapping part) or partially overlap with one of the two sound guide holes (e.g., the first sound guide hole 111 or the second sound guide hole 112) corresponding to the low-frequency acoustic unit 13. It should be noted that when the third sound guide hole completely overlaps with one of the two sound guide holes corresponding to the low-frequency acoustic unit 13 (for example, the first sound guide hole 111 or the second sound guide hole 112), the third sound guide hole and its completely overlapping sound guide hole can be regarded as a single sound guide hole.

[0053] It should be understood that, Figure 2 The provided framework diagrams are for illustrative purposes only and are not intended to limit the scope of this application. Various modifications and variations can be made by those skilled in the art based on the guidance of this application, and all such modifications and variations will fall within the scope of protection of the application. In some embodiments, the number of original components shown in the figures can be adjusted according to actual circumstances. In some embodiments, Figure 2 One or more components shown may be omitted, or one or more other components may be added or removed. For example, the acoustic output device 10 may not include the support structure 12, and the housing 11 may have the wearing and fixing function of the support structure 12. In some embodiments, a component may be replaced by another component that can perform a similar function. In some embodiments, a component may be split into multiple sub-components, or multiple components may be combined into a single component. For example, the housing 11 and the support structure 12 may be combined into a single component.

[0054] Figure 6 This is a schematic diagram of the external outline of the housing according to some embodiments shown in this specification. Figures 7A-7C This is a schematic diagram showing the positions of the first and third sound guide holes according to some embodiments of this specification. Figure 4 and Figure 6As shown, in some embodiments, at least two sound guide holes on the housing 11 may include a first sound guide hole 111, a second sound guide hole 112, and a third sound guide hole 113. The first sound guide hole 111 and the second sound guide hole 112 are acoustically coupled to both sides of the diaphragm of the low-frequency acoustic unit 13, respectively. In some embodiments, the first sound guide hole 111 may be formed on the side of the housing 11 facing the auricle. The diaphragm of the low-frequency acoustic unit 13 can divide the housing 11 into a front cavity and a rear cavity. The first sound guide hole 111 can connect to the front cavity and guide the sound generated in the front cavity out of the housing 11 and into the user's ear canal, so that the user can hear the sound. In some embodiments, a portion of the sound emitted through the first sound guide hole 111 can propagate into the ear canal, allowing the user to hear the sound. Another portion, along with the sound reflected from the ear canal, can propagate through the gap between the housing 11 and the ear (e.g., a portion of the concha not covered by the housing 11) to the acoustic output device 10 and the outside of the ear, thus creating a first sound leakage in the far field. Simultaneously, other sides of the housing 11 (e.g., sides away from or opposite to the user's ear canal) can be provided with second sound guide holes 112. The sound hole 112 is farther from the ear canal than the first sound guide hole 111. The sound propagated from the second sound guide hole 112 generally forms a second sound leakage in the far field. The intensity of the first sound leakage is comparable to that of the second sound leakage, and the phases of the first sound leakage and the second sound leakage are (close to) opposite to each other. This allows them to cancel each other out of phase in the far field, which is beneficial for achieving the sound leakage reduction effect of the acoustic output device 10 at low frequencies, making the acoustic output device 10 exhibit dipole directivity in the low frequency range (e.g., 100Hz-800Hz). In some embodiments, the third sound guide hole 113 is acoustically coupled to one side of the diaphragm of the high-frequency acoustic unit 14, and the third sound guide hole 113 is oriented towards the user's ear canal. The high-frequency acoustic unit 14 outputs the third sound wave only through the third sound guide hole 113, which serves as the sound source of the third sound wave. Because the wavelength of the high-frequency sound wave generated by the high-frequency acoustic unit 14 is relatively short, and the wavelength is comparable to the size of the third sound guide hole 113 through which the high-frequency acoustic unit 14 outputs the third sound wave, the sound source of the third sound wave cannot be regarded as a point sound source, but rather as a surface sound source. The sound field received at a certain position in the far field of the acoustic output device 10 can be regarded as the superposition of countless point sound sources on the radiation surface where the surface sound source is located. Due to the difference in the sound path between each point sound source and the receiving position, the third sound wave received at that receiving position is related to the frequency and wavelength. The higher the frequency of the third sound wave, the sharper and better the directivity of the sound field of the high-frequency acoustic unit 14. Since the frequency of the third sound wave output by the high-frequency acoustic unit 14 through the third sound guide hole 113 is relatively high, its directivity is also better, which can improve the user's hearing effect on the third sound wave output by the high-frequency acoustic unit 14 and ensure the output effect of the acoustic output device 10 across the entire frequency band.

[0055] In some embodiments, the first sound guide hole 111, the second sound guide hole 112, and the third sound guide hole 113 are located at different positions on the housing 11. In some embodiments, to enhance the sound volume at the user's ear canal opening, the first sound guide hole 111 and the third sound guide hole 113 can be located on the housing 11 closer to the user's ear canal opening, for example, on the side wall of the housing 11 facing the user's ear canal opening. The second sound guide hole 112 can be located on the housing 11 away from the user's ear canal opening, for example, on the side wall of the housing 11 facing away from the user's ear canal opening, to avoid the second sound wave it emits from canceling interference with the first sound wave emitted from the first sound guide hole 111 near the user's ear canal opening, thus affecting the listening effect. In some embodiments, such as Figures 7A-7C As shown, the first sound guide hole 111 and the third sound guide hole 113 can be disposed on the same side wall of the housing 11, so that both the first sound guide hole 111 and the third sound guide hole 113 are oriented towards the user's ear canal opening, thereby increasing the listening volume of the user's ear canal opening. In some embodiments, such as Figure 7A As shown, on the side wall with the first sound guide hole 111, the third sound guide hole 113 can be set at any position other than the first sound guide hole 111. This reduces the design difficulty of the third sound guide hole 113 facing the user's ear canal and makes the setting position of the high-frequency acoustic unit 14 more flexible.

[0056] In some embodiments, the second sound guide hole 112 and the first sound guide hole 111 are respectively located on both sides of the diaphragm of the low-frequency acoustic unit 13, and the second sound guide hole 112 is disposed opposite to the user's ear canal opening. For example, the first sidewall of the housing 11 faces the user's ear canal opening, the first sound guide hole 111 may be located on the first sidewall of the housing 11, and the second sound guide hole 112 may be located on the third sidewall opposite to the first sidewall and away from the user's ear canal opening, or the second sound guide hole 112 may be located on the second sidewall adjacent to the first sidewall and away from the user's ear canal opening, so that when the acoustic output device 10 is worn, the first sound guide hole 111 faces the user's ear canal opening, and the second sound guide hole 112 faces away from the user's ear canal opening. The sound output from the first sound guide hole 111 and the sound output from the second sound guide hole 112, which meet specific conditions (e.g., a phase difference of about 180°), can form a dipole-like radiation. In the far field, the sound output from the first sound guide hole 111 and the sound output from the second sound guide hole 112 can cancel each other out of phase, thereby reducing the sound leakage volume of the low-frequency acoustic unit 13 in the far field and preventing the sound output from the acoustic output device 10 at low frequencies from being heard by people nearby.

[0057] When a user wears the sound-generating device, to ensure the sound volume at the user's ear canal opening and the sound leakage reduction effect of the low-frequency acoustic unit 13 in the far field, the ratio between the distance between the second sound guide hole 112 and the user's ear canal opening and the distance between the first sound guide hole 111 and the user's ear canal opening can be maximized. In some embodiments, the ratio between the distance between the second sound guide hole 112 and the user's ear canal opening and the distance between the first sound guide hole 111 and the user's ear canal opening can be greater than 1.2. In some embodiments, to further ensure the sound volume at the user's ear canal opening and the sound leakage reduction effect of the low-frequency acoustic unit 13 in the far field, the ratio between the distance between the second sound guide hole 112 and the user's ear canal opening and the distance between the first sound guide hole 111 and the user's ear canal opening can range from 1.2 to 8. In some embodiments, to further ensure the listening volume at the user's ear canal opening and the sound leakage reduction effect of the low-frequency acoustic unit 13 in the far field, the ratio between the distance of the second sound guide hole 112 and the user's ear canal opening and the distance between the first sound guide hole 111 and the user's ear canal opening can be in the range of 1.4-5. In some embodiments, to further ensure the listening volume at the user's ear canal opening and the sound leakage reduction effect of the low-frequency acoustic unit 13 in the far field, the ratio between the distance of the second sound guide hole 112 and the user's ear canal opening and the distance between the first sound guide hole 111 and the user's ear canal opening can be in the range of 1.5-2.5.

[0058] In some embodiments, to ensure that the user can hear a large volume when wearing the acoustic output device 10, the distance between the first sound guide hole 111 and the user's ear canal opening should be as small as possible. The distance between the first sound guide hole 111 and the user's ear canal opening refers to the distance between the center of the first sound guide hole 111 and the centroid of the outline of the user's ear canal opening. This distance can be the distance between the center of the first sound guide hole 111 and the center of the user's ear canal opening, or the distance between the center of the first sound guide hole 111 and the plane containing the user's ear canal opening. In some embodiments, the distance between the first sound guide hole 111 and the user's ear canal opening can be less than 4 cm. In some embodiments, to further ensure the user's listening volume, the distance between the first sound guide hole 111 and the user's ear canal opening can be less than 3 cm. In some embodiments, to ensure the ear canal opening is open, the first sound guide hole 111 needs to maintain a certain distance from the ear canal opening; the range of this distance can be 0.5 cm to 2.5 cm. In some embodiments, in order to further ensure the openness of the ear canal opening, the distance between the first sound guide hole 111 and the user's ear canal opening can be in the range of 1cm-3.1cm.

[0059] When a user wears the acoustic output device 10, if the distance between the second sound guide hole 112 and the user's ear canal opening is too small, the sound output from the second sound guide hole 112 near the user's ear canal opening will cancel out the sound output from the first sound guide hole 111. To ensure the listening volume at the user's ear canal opening and reduce far-field sound leakage, in some embodiments, the distance between the second sound guide hole 112 and the user's ear canal opening can be greater than 1 cm. Furthermore, if the distance between the first sound guide hole 111 and the second sound guide hole 112 is too large, or if the distance between the second sound guide hole 112 and the ear canal opening is too large, it will result in an excessively large sound-generating device, affecting the user's wearing experience. To ensure the user's wearing experience, in some embodiments, the distance between the second sound guide hole 112 and the user's ear canal opening is less than 8 cm. In some embodiments, to further ensure the low-frequency output effect of the acoustic output device 10, the distance between the second sound guide hole 112 and the user's ear canal opening can be in the range of 1.5 cm to 7 cm. In some embodiments, to further ensure the sound volume at the user's ear canal opening and the sound leakage reduction effect of the low-frequency acoustic unit 13 in the far field, the distance between the second sound guide hole 112 and the user's ear canal opening can be in the range of 2.5cm-4cm.

[0060] In some embodiments, to avoid near-field cancellation between the second sound wave emitted by the second sound guide 112 and the first sound wave emitted by the first sound guide 111, which could affect the user's listening quality, the distance between the second sound guide 112 and the first sound guide 111 should not be too close. The distance between the second sound guide 112 and the first sound guide 111 can refer to the distance between the center of the second sound guide 112 and the center of the first sound guide 111. In some embodiments, the distance between the second sound guide 112 and the first sound guide 111 can be 4mm-15.11mm. In some embodiments, to further ensure the user's listening quality, the distance between the second sound guide 112 and the first sound guide 111 can be 8mm-10mm.

[0061] In some embodiments, the third sound guide hole 113 is closer to the user's ear canal than the first sound guide hole 111 and the second sound guide hole 112. Combined with the orientation of the third sound guide hole 113 towards the user's ear canal, this allows for a greater reception of high-frequency sounds at the user's ear canal opening, ensuring a sufficiently high sound pressure level and thus guaranteeing a good high-frequency listening experience. In some embodiments, the distance between the third sound guide hole 113 and the user's ear canal opening can be less than 2.5 cm. In some embodiments, to further ensure a good high-frequency listening experience, the distance between the third sound guide hole 113 and the user's ear canal opening can be less than 1 cm. In some embodiments, to ensure the ear canal opening remains open, the third sound guide hole 113 needs to maintain a certain distance from the ear canal opening; this distance can range from 0.1 cm to 1.5 cm. In some embodiments, to further ensure the ear canal opening remains open, the distance between the third sound guide hole 113 and the user's ear canal opening can range from 0.5 cm to 2.5 cm.

[0062] Please refer to Figure 1 , Figure 3 and Figure 6 In some embodiments, the housing 11 may include a sidewall facing the frontal lateral surface of the user's auricle (also referred to as the inner side IS) and a sidewall facing away from the frontal lateral surface of the user's auricle (also referred to as the outer side OS).

[0063] In some embodiments, when worn, the inner surface IS faces the auricle along the thickness direction Z, and the outer surface OS faces away from the auricle along the thickness direction Z. In some embodiments, the housing 11 may further include a connecting surface connecting the inner surface IS and the outer surface OS. It should be noted that, when viewed along the thickness direction Z in the wearing state, the housing 11 can be configured as a circle, ellipse, rounded square, rounded rectangle, etc. When the housing 11 is configured as a circle, ellipse, etc., the connecting surface may refer to the arcuate side of the housing 11; while when the housing 11 is configured as a rounded square, rounded rectangle, etc., the connecting surface may include the lower surface LS, the upper surface US, and the rear surface RS. Therefore, for ease of description, this embodiment uses a rounded rectangle as an example for illustrative explanation. The length of the housing 11 in the major axis direction X may be greater than the width of the housing 11 in the minor axis direction Y. Figure 3 and Figure 6 As shown, the housing 11 may have an upper side US that is away from the ear canal 101 along the short axis Y and a lower side LS that faces the ear canal 101 in the wearing state, and a rear side RS that connects the upper side US and the lower side LS. The rear side RS is located at the end facing the back of the head in the long axis X in the wearing state.

[0064] In some embodiments, the high-frequency acoustic unit 14 and the low-frequency acoustic unit 13 can be stacked in the thickness direction Z so that the first sound guide hole 111 and the third sound guide hole 113 can both be located on the inner surface IS, thereby allowing the first sound guide hole 111 and the third sound guide hole 113 to be close to the user's ear canal, thereby increasing the listening volume at the user's ear canal opening. The stacking design of the high-frequency acoustic unit 14 and the low-frequency acoustic unit 13 in the thickness direction Z means that the high-frequency acoustic unit 14 is located above (e.g., directly above, or to the side above) or below (e.g., directly below, or to the side below) the low-frequency acoustic unit 13 in the thickness direction Z, that is, the high-frequency acoustic unit 14 is closer to the outer surface OS or the inner surface IS than the low-frequency acoustic unit 13 in the thickness direction Z. In some embodiments, the second sound guide hole 112 may be disposed on other side walls of the housing 11 that are far from the user's ear (e.g., upper side US, rear side RS, outer side OS, etc.) so that the second sound guide hole 112 is at a suitable distance from the user's ear canal opening, so as to ensure the listening volume at the user's ear canal opening and the sound leakage reduction effect of the low frequency acoustic unit 13 in the far field.

[0065] Please refer to Figure 7C In some embodiments, the first sound guide hole 111 may completely overlap with the third sound guide hole 113. In this case, the first sound guide hole 111 and the third sound guide hole 113 can be regarded as a single sound guide hole, and the one with the larger area between the first sound guide hole 111 and the third sound guide hole 113 is the sound guide hole. Taking the first sound guide hole 111 as an example, the first sound guide hole 111 is acoustically coupled to one side of the diaphragm of the low-frequency acoustic unit 13 and one side of the diaphragm of the high-frequency acoustic unit 14. Both the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 radiate sound to the user's ear canal through the first sound guide hole 111.

[0066] Please refer to Figure 7B In some embodiments, the first sound guide 111 may also partially overlap with the third sound guide 113. In this case, the first sound guide 111 and the third sound guide 113 can also be regarded as a single sound guide, which includes a first region (i.e., the non-overlapping portion of the first sound guide 111), a second region (i.e., the non-overlapping portion of the third sound guide 113), and a third region (i.e., the overlapping portion of the first sound guide 111 and the third sound guide 113). The first and third regions of the sound guide are simultaneously acoustically coupled to one side of the diaphragm of the low-frequency acoustic unit 13, and the low-frequency acoustic unit 13 radiates sound into the user's ear canal through the first and third regions of the sound guide; the second and third regions of the sound guide are simultaneously acoustically coupled to one side of the diaphragm of the high-frequency acoustic unit 14, and the high-frequency acoustic unit 14 radiates sound into the user's ear canal through the second and third regions of the sound guide.

[0067] Please refer to Figure 7AWhen the first sound guide hole 111 and the third sound guide hole 113 do not coincide, the third sound guide hole 113 can be set at any position other than the first sound guide hole 111. This reduces the design difficulty of the third sound guide hole 113 facing the user's ear canal opening and makes the placement of the high-frequency acoustic unit 14 more flexible. At the same time, the high-frequency acoustic unit 14 can protrude from the inner side IS of the housing 11 or be embedded in the housing 11 corresponding to the inner side IS, further improving the installation flexibility of the high-frequency acoustic unit 14.

[0068] Please refer to Figure 7B and Figure 7C When the first sound guide hole 111 and the third sound guide hole 113 overlap, they need to be on the same plane. In this case, the high-frequency acoustic unit 14 can be embedded in the inner side IS corresponding to the housing 11. The first sound guide hole 111 and the third sound guide hole 113 can be considered as a single sound guide hole, and the design of a single sound guide hole simplifies the structure and reduces the difficulty of manufacturing design. At the same time, since the high-frequency acoustic unit 14 is embedded in the housing 11, it does not protrude from the surface of the housing 11, resulting in a flat surface and a more aesthetically pleasing shape.

[0069] In some wearing conditions, since both the third sound guide hole 113 and the first sound guide hole 111 are located on the inner surface IS, and the high-frequency acoustic unit 14 is located on the housing 11 corresponding to the inner surface IS, the high-frequency acoustic unit 14 may block the first sound guide hole 111, thereby reducing the sound output by the low-frequency acoustic unit 13 through the first sound guide hole 111, and thus affecting the low-frequency listening volume in the user's ear canal. Therefore, the high-frequency acoustic unit 14 should be positioned away from the first sound guide hole 111 as much as possible.

[0070] In some embodiments, to avoid the high-frequency acoustic unit 14 blocking the first sound guide hole 111 and to ensure the user's low-frequency listening volume, the overlap ratio between the projected area of ​​the high-frequency acoustic unit 14 on the inner side IS of the housing 11 and the projected area of ​​the sound guide hole (i.e., the first sound guide hole 111) of the low-frequency acoustic unit 13 on the inner side IS of the housing 11 may not exceed 10%, that is, the ratio of the overlapping area to the area of ​​the first sound guide hole 111 may not exceed 10%. In some embodiments, to further ensure the user's low-frequency listening volume in the ear canal, the overlap ratio between the projected area of ​​the high-frequency acoustic unit 14 on the inner side IS of the housing 11 and the projected area of ​​the sound guide hole (i.e., the first sound guide hole 111) of the low-frequency acoustic unit 13 on the inner side IS of the housing 11 may not exceed 8%. In some embodiments, in order to further ensure the low-frequency sound volume at the user's ear canal, the overlap ratio between the projected area of ​​the high-frequency acoustic unit 14 on the inner side IS of the housing 11 and the projected area of ​​the sound guide hole (i.e., the first sound guide hole 111) of the low-frequency acoustic unit 13 on the inner side IS of the housing 11 may not exceed 5%.

[0071] To ensure a higher frequency sound reception rate at the user's ear canal opening and a sufficiently high sound pressure level, thus guaranteeing good high-frequency listening performance, in some embodiments, when worn, the third sound guide hole 113 is positioned closer to the user's ear canal than the first sound guide hole 111 on the inner surface IS. The position of the third sound guide hole 113 corresponds to the position of the high-frequency acoustic unit 14 on the inner surface IS of the housing 11, meaning the high-frequency acoustic unit 14 is closer to the user's ear canal than the first sound guide hole 111. In some embodiments, the position of the high-frequency acoustic unit 14 on the inner surface IS can be characterized by the centroid of its projection on the inner surface IS, meaning the centroid of the projection of the high-frequency acoustic unit 14 on the inner surface IS is closer to the user's ear canal than the sound guide hole (first sound guide hole 111) of the low-frequency acoustic unit 13 on the inner surface IS.

[0072] Figure 8 This is a schematic diagram illustrating the wearing of an acoustic output device, according to some embodiments of this specification, with the housing extending into the concha. Please refer to... Figure 8 In some embodiments, the housing 11 may have a connection end CE connected to the support structure 12. When the acoustic output device 10 is in the wearing state, the first part 121 of the support structure 12 is hung between the user's auricle and head, and the second part 122 of the support structure 12 extends toward the auricle away from the head and is connected to the connection end CE of the housing 11 to achieve clamping and fixing of the housing 11.

[0073] By extending at least partially into the concha 102, the listening volume at the listening position (e.g., in the ear canal) can be increased, especially the mid-to-low frequency listening volume, while still maintaining a good far-field leakage cancellation effect. As an example only, when the entire or part of the structure of the housing 11 extends into the concha 102, the housing 11 and the concha 102 form a cavity-like structure (hereinafter referred to as a cavity-like structure). In the embodiments described, the cavity-like structure can be understood as a semi-enclosed structure formed by the side of the housing 11 and the structure of the concha 102. This semi-enclosed structure ensures that the interior is not completely sealed off from the external environment, but rather has a leakage structure (e.g., openings, gaps, channels, etc.) that acoustically communicates with the external environment. When a user wears the acoustic output device 10, one or more sound guide holes, such as a first sound guide hole 111, can be provided on the side of the housing 11 near or facing the user's ear canal (e.g., the inner side IS). One or more sound guide holes, such as a second sound guide hole 112, can be provided on other sides of the housing 11 (e.g., the outer side RS away from or away from the user's ear canal). The first sound guide hole 111 is acoustically coupled to the front cavity of the acoustic output device 10, and the second sound guide hole 112 is acoustically coupled to the rear cavity of the acoustic output device 10. The sound output from the first sound guide hole 111 and the sound output from the second sound guide hole 112 can be approximated as two sound sources with opposite phases. The inner walls of the housing 11 and the concha 102 form a cavity-like structure, where the sound source corresponding to the first sound guide hole 111 is located inside the cavity-like structure, and the sound source corresponding to the second sound guide hole 112 is located outside the cavity-like structure, forming... Figure 9 The acoustic model shown.

[0074] Figure 9 This is a schematic diagram of an acoustic model formed according to some embodiments of the acoustic output device shown in this specification. For example... Figure 9As shown, the cavity-like structure 402 may include a listening position and at least one sound source 401A. Here, "including" can mean that at least one of the listening position and the sound source 401A is inside the cavity-like structure 402, or that at least one of the listening position and the sound source 401A is at the inner edge of the cavity-like structure 402. The listening position can be equivalent to the entrance of the ear canal, or it can be an acoustic reference point of the ear, such as the ear reference point (ERP), ear-drum reference point (DRP), or an entrance structure guiding the listener. Because the sound source 401A is enclosed by the cavity-like structure 402, most of the sound radiated from it will reach the listening position through direct or reflected sound. Conversely, without the cavity-like structure 402, most of the sound radiated from the sound source 401A will not reach the listening position. Therefore, the cavity structure significantly increases the volume of the sound reaching the listening position. Simultaneously, only a small portion of the anti-phase sound radiated by the anti-phase sound source 401B outside the cavity-like structure 402 enters the cavity-like structure 402 through the leakage structure 403. This is equivalent to generating a secondary sound source 401B' at the leakage structure 403, whose intensity is significantly less than that of the sound source 401B and also significantly less than that of the sound source 401A. The sound generated by the secondary sound source 401B' has a weak anti-phase cancellation effect on the sound source 401A within the cavity, significantly increasing the listening volume at the listening position. Regarding sound leakage, the sound radiated by the sound source 401A to the outside through the cavity's leakage structure 403 is equivalent to generating a secondary sound source 401A' at the leakage structure 403. Since almost all the sound radiated by the sound source 401A is output from the leakage structure 403, and the scale of the cavity-like structure 402 is much smaller than the spatial scale for evaluating sound leakage (by at least one order of magnitude), the intensity of the secondary sound source 401A' can be considered comparable to that of the sound source 401A. From the perspective of the external space, the secondary sound source 401A' and the sound source 401B form a dual sound source cancellation to reduce sound leakage.

[0075] In specific application scenarios, the outer wall surface of the housing 11 is usually flat or curved, while the contour of the user's concha 102 is an uneven structure. By extending part or all of the housing 11 into the concha 102, a cavity-like structure communicating with the outside is formed between the contours of the housing 11 and the concha 102. Furthermore, by setting the first sound guide hole 111 on the housing 11 facing the user's ear canal and near the edge of the concha 102 (e.g., the inner side IS), and setting the second sound guide hole 112 on the housing 11 away from or away from the ear canal, a structure can be constructed. Figure 9 The acoustic model shown allows the user to improve their listening position at the ear canal opening and reduce far-field sound leakage when wearing the acoustic output device 10.

[0076] like Figure 8 As shown, when the shell 11 is at least partially inserted into the concha cavity, the shell 11 is tilted when worn. Please refer to [reference needed] for details. Figure 3 The description of the dashed box B is not repeated here. At this time, the connection end CE is closer to the user's ear canal, and the rear side RS is farther from the user's ear canal than the connection end CE. Because it needs to contact the concha, a part of the inner side IS near the rear side RS may contact the concha. In some embodiments, the centroid of the projection of the high-frequency acoustic unit 14 on the inner side IS is closer to the connection end CE than the sound guide hole (first sound guide hole 111) of the low-frequency acoustic unit 13 on the inner side IS, so that the third sound guide hole 113 is closer to the user's ear canal than the first sound guide hole 111, ensuring the directivity of the third sound guide hole 113, thereby ensuring the high-frequency listening effect.

[0077] In some embodiments, when the housing 11 is not inserted into the concha cavity, the housing 11 can also be tilted when worn, so that the corresponding connection end CE is closer to the user's ear canal and the rear side RS is farther from the user's ear canal. At this time, the centroid of the projection of the high-frequency acoustic unit 14 on the inner side IS is closer to the connection end CE than the sound guide hole (first sound guide hole 111) of the low-frequency acoustic unit 13 on the inner side IS.

[0078] Figure 10 This is a schematic diagram of the frequency response curves of the acoustic output device corresponding to different placement positions of the high-frequency acoustic unit according to some embodiments of this specification. Please refer to... Figure 10 curve L 101 This represents the frequency response curve of the acoustic output device 10 when the high-frequency acoustic unit 14 is positioned near the connection terminal CE of the housing 11, i.e., curve L. 101 The frequency response curve of the acoustic output device 10 when the high-frequency acoustic unit 14 is closer to the connection end CE and closer to the user's ear canal than the first sound guide hole 111; Curve L 102 This represents the frequency response curve of the acoustic output device 10 when the high-frequency acoustic unit 14 is positioned near the rear side RS of the housing 11, i.e., curve L. 102 The frequency response curve of the acoustic output device 10 is shown when the high-frequency acoustic unit 14 is closer to the rear side RS, farther from the connection end CE, and farther from the user's ear canal compared to the first sound guide hole 111. Comparison curve L 101 With curve L 102 It can be seen that, within the frequency range of 8kHz-10kHz, curve L... 101 Overall higher than curve L 102 And curve L 101The overall surface is flatter. That is, when the centroid of the projection of the high-frequency acoustic unit 14 on the inner side IS is closer to the connection end CE than the sound guide hole (first sound guide hole 111) of the low-frequency acoustic unit 13 on the inner side IS, the acoustic output device 10 outputs a larger sound pressure level at the user's ear canal and has a higher sound quality.

[0079] Please refer to Figure 6 and Figure 8 In some embodiments, in the short axis direction Y of the housing 11, the centroid of the projection of the high-frequency acoustic unit 14 on the inner side IS is above the sound guide hole (i.e., the first sound guide hole 111) of the low-frequency acoustic unit 13 on the inner side IS. That is, the centroid of the projection of the high-frequency acoustic unit 14 on the inner side IS is closer to the upper side US than the centroid of the projection of the first sound guide hole 111, so as to avoid the high-frequency acoustic unit 14 blocking the first sound guide hole 111, which would reduce the sound output of the low-frequency acoustic unit 13 through the first sound guide hole 111 and thus affect the low-frequency listening volume in the user's ear canal. In some embodiments, the centroid of the projection of the high-frequency acoustic unit 14 onto the inner side IS can be located directly above the first sound guide hole 111 in the minor axis direction Y; or, the centroid of the projection of the high-frequency acoustic unit 14 onto the inner side IS can also be located obliquely above the first sound guide hole 111 and close to the connection end CE in the minor axis direction Y; or, the centroid of the projection of the high-frequency acoustic unit 14 onto the inner side IS can also be located obliquely above the first sound guide hole 111 and close to the rear side RS in the minor axis direction Y.

[0080] It should be noted that, in the wearing state, the free end of the housing 11 (i.e., the rear side RS of the housing 11) can not only extend into the concha, but also project onto the antihelix, or onto the left and right sides of the head, located on the front side of the auricle along the sagittal axis of the human body. In other words, the support structure 12 can support the housing 11 to be worn in various positions such as the concha, antihelix, front of the auricle, and back of the auricle, making the acoustic output device 10 suitable for various wearing methods. For the acoustic output device 10 in partial wearing methods (such as wearing it in the concha or back of the auricle), the centroid of the projection of the high-frequency acoustic unit 14 on the inner side IS is closer to the connection point (i.e., the connection end CE) of the support structure 12 and the housing 11 than the centroid of the projection of the low-frequency acoustic unit 13 on the inner side IS of the sound guide hole (first sound guide hole 111). This allows the third sound guide hole 113 to be closer to the user's ear canal than the first sound guide hole 111, thereby ensuring high-frequency listening effect.

[0081] In some different wearing methods, in order to bring the high-frequency acoustic unit 14 closer to the user's ear canal than the first sound guide hole 111, the position of the high-frequency acoustic unit 14 may be changed accordingly. The following uses... Figure 11The acoustic output device 10 shown is used as an example for detailed explanation. It should be understood that, without violating the corresponding acoustic principles, Figure 11 The structure and corresponding parameters of the acoustic output device 10 can also be applied to the acoustic output device 10 mentioned above, which can insert the housing 11 into the concha cavity.

[0082] Figure 11 This is an exemplary wearing diagram of an acoustic output device according to other embodiments of this specification.

[0083] Reference Figure 11 In some embodiments, when the acoustic output device 10 is worn, at least a portion of the housing 11 may cover the user's antihelix region, wherein the antihelix region may include... Figure 1 The antihelix 105, the upper foot of the antihelix, and the lower foot of the antihelix are shown in any one or more positions. At this time, the housing 11 is located above the concha cavity 102 and the ear canal opening, and the user's ear canal opening is in an open state. In some embodiments, the housing 11 may include a first sound guide hole 111 and a second sound guide hole 112. The first sound guide hole 111 is acoustically coupled to the front cavity of the acoustic output device 10, and the second sound guide hole 112 is acoustically coupled to the rear cavity of the acoustic output device 10. The sound output from the first sound guide hole 111 and the sound output from the second sound guide hole 112 can be approximated as two point sound sources. The sounds from these two point sound sources have opposite phases and form a dipole. When the user wears the acoustic output device 10, the first sound guide hole 111 is located on the side wall of the housing 11 facing or close to the user's ear canal opening, and the second sound guide hole 112 is located on the side wall of the housing 11 away from or away from the user's ear canal opening. This design allows the user's ear canal to be fully open, ensuring the acoustic output device 10's sound quality while enabling the user to hear external sounds more clearly, thus enhancing the open-back listening experience. When worn, the inner surface IS of the shell 11 rests against the antihelix region. The concave-convex structure of the antihelix region acts as a baffle, increasing the sound path of the sound emitted from the second sound guide hole 112 to the external ear canal. This increases the sound path difference between the first and second sound guide holes 111 and 112 to the external ear canal, reducing the destructive interference between the first and second sound guide holes 111 and 112 at the listening position, and increasing the sound intensity at the near-field listening position.

[0084] like Figure 11 As shown, by placing at least a portion of the housing 11 at the user's antihelix 105, the output effect of the acoustic output device 10 can be improved, that is, while ensuring the far-field sound leakage reduction effect, the sound intensity at the near-field listening position is increased. This allows the sound emitted from the first sound guide hole 111 to be transmitted directly to the user's ear canal opening without obstruction, while the sound emitted from the second sound guide hole 112 needs to bypass or pass through the housing 11 to form a similar shape. Figure 12 The acoustic model shown.

[0085] Figure 12 This is a schematic diagram of an acoustic model formed according to some embodiments of the acoustic output device shown in this specification. For example... Figure 12 As shown, when a baffle is placed between point sound sources A1 and A2, in the near field, the sound field of point sound source A2 needs to bypass the baffle to interfere with the sound wave of point sound source A1 at the listening position, which is equivalent to increasing the sound path from point sound source A2 to the listening position. Therefore, assuming that point sound sources A1 and A2 have the same amplitude, compared with the case without a baffle, the amplitude difference of the sound waves of point sound sources A1 and A2 at the listening position increases, thereby reducing the degree of cancellation between the two sound paths at the listening position and increasing the volume at the listening position. In the far field, since the sound waves generated by point sound sources A1 and A2 do not need to bypass the baffle to interfere over a large spatial range (similar to the case without a baffle), the sound leakage in the far field does not increase significantly compared with the case without a baffle. Therefore, placing a baffle structure around one of the point sound sources A1 and A2 can significantly increase the volume at the near field listening position without significantly increasing the volume of sound leakage in the far field.

[0086] like Figure 11 As shown, the inner surface IS and lower surface LS of the housing 11 are relatively close to the user's ear canal. In order to make the high-frequency acoustic unit 14 closer to the user's ear canal, in some embodiments, the high-frequency acoustic unit 14 can be disposed on the lower surface LS of the housing 11, or at the connection between the lower surface LS and the inner surface IS of the housing 11. This allows the third sound guide hole 113 of the high-frequency acoustic unit 14 to be better directed to the user's ear canal, thereby increasing the high-frequency listening volume of the user's ear canal and compensating for the insufficient output of the acoustic output device 10 in the mid-to-high frequency range (e.g., the frequency range greater than 8kHz). This ensures that the acoustic output device 10 has a good acoustic output effect across the entire frequency range.

[0087] Figure 13 This is a schematic diagram showing the position of the acoustic output device relative to the ear according to some embodiments of this specification. Please refer to it. Figure 13 , Figure 13 In this context, N1 represents the vibration direction of the diaphragm of the high-frequency acoustic unit 14, and N2 represents the vibration direction of the diaphragm of the low-frequency acoustic unit 13. In some embodiments, the vibration direction N2 of the low-frequency acoustic unit 13 is towards the user's antihelix region, and the first sound guide hole 111 is positioned towards the user's antihelix. In this case, the first sound guide hole 111 and the second sound guide hole 112 form a dipole, which can act as a baffle in the antihelix region, thereby increasing the sound volume in the user's ear canal and ensuring the user's listening effect.

[0088] The high-frequency acoustic unit 14 outputs sound only through the third sound guide hole 113. As a monopole, the high-frequency sound wave output by the high-frequency acoustic unit 14 has a short wavelength. If the vibration direction N1 of the high-frequency acoustic unit 14 is set towards the user's antihelix region, the sound output by the high-frequency acoustic unit 14 through the third sound guide hole 113 will be easily reflected by the ear, affecting the user's high-frequency listening volume. In some embodiments, the vibration direction N1 of the high-frequency acoustic unit 14 can be towards the user's ear canal, and the third sound guide hole 113 can be set towards the user's ear canal.

[0089] In some embodiments, for the dipole formed by the first sound guide hole 111 and the second sound guide hole 112, in order to make the antihelix of the user's auricle act as a baffle, the sound path difference from the first sound guide hole 111 and the second sound guide hole 112 to the user's ear canal opening is increased to improve the low-frequency listening volume at the user's ear canal opening. The first sound guide hole 111 can be designed to face the user's ear canal, and the second sound guide hole 112 can be designed to face away from the user's ear canal or face the antihelix. In some embodiments, the vibration direction N2 of the low-frequency acoustic unit 13 can be oriented towards the user's antihelix region. In some embodiments, in order to make the diaphragm of the low-frequency acoustic unit 13 have a larger size and vibration space, the diaphragm of the low-frequency acoustic unit 13 can be parallel or approximately parallel to the inner surface IS or the outer surface OS. In this case, the vibration direction N2 of the low-frequency acoustic unit 13 can be perpendicular or approximately perpendicular to the inner surface IS or the outer surface OS. In some embodiments, to ensure that the acoustic output device 10 has a good sound leakage reduction effect while also having a good acoustic output effect across the entire frequency band, the angle α between the vibration direction N1 of the high-frequency acoustic unit 14 and the vibration direction N2 of the low-frequency acoustic unit 13 can be in the range of 36°-54°. In some embodiments, to further improve the acoustic output effect of the acoustic output device 10 across the entire frequency band and increase the user's listening volume, the angle α between the vibration direction N1 of the high-frequency acoustic unit 14 and the vibration direction N2 of the low-frequency acoustic unit 13 can be in the range of 40°-50°. In some embodiments, to further improve the acoustic output effect of the acoustic output device 10 across the entire frequency band and increase the user's listening volume, the angle α between the vibration direction N1 of the high-frequency acoustic unit 14 and the vibration direction N2 of the low-frequency acoustic unit 13 can be 45°.

[0090] The high-frequency sound waves output by the high-frequency acoustic unit 14 have a short wavelength and are easily absorbed. The different positions of the high-frequency acoustic unit 14 relative to the housing 11 (e.g., embedded, flush, protruding, etc.) will affect the loss of the high-frequency sound waves reaching the user's ear canal, further affecting the output effect of the high-frequency sound waves of the high-frequency acoustic unit 14, thereby affecting the listening volume of the user's ear canal.

[0091] In some embodiments, the inner surface IS of the housing 11 includes a projection area and a non-projection area of ​​the high-frequency acoustic unit 14, and the projection area protrudes beyond the non-projection area in the thickness direction Z of the housing 11. In some embodiments, the projection area refers to the area covered by the projection of the high-frequency acoustic unit 14 onto the inner surface IS along the thickness direction Z; the non-projection area refers to the area on the inner surface IS not covered by the projection of the high-frequency acoustic unit 14. The projection area protruding beyond the non-projection area means that, in the thickness direction Z, the high-frequency acoustic unit 14 is at least partially protruding relative to the inner surface IS, such as... Figure 4 , Figure 6 as well as Figure 14 As shown. By protruding the high-frequency acoustic unit 14 relative to the inner surface IS, the high-frequency acoustic unit 14 can easily approach the user's ear canal, thereby increasing the user's listening volume.

[0092] Figure 14 This is a schematic diagram illustrating the distribution of high-frequency sound waves when a high-frequency acoustic unit protrudes from the housing, as shown in some embodiments of this specification. For example... Figure 14 As shown, the bottom of the high-frequency acoustic unit 14 is basically flush with the outer surface of the housing 11, meaning the high-frequency acoustic unit protrudes completely from the surface of the housing 11. With this configuration, when an input signal has a frequency of 15kHz, the high-frequency sound wave output by the high-frequency acoustic unit 14 is approximately a spherical wave, resulting in good directivity of the high-frequency acoustic unit 14 and directing the signal into the user's ear canal 101 (i.e.,...). Figure 14 The sound pressure level at point C is relatively high, and the user's listening volume is relatively high.

[0093] Figure 15 This is a schematic diagram illustrating the distribution of high-frequency sound waves when a high-frequency acoustic unit is embedded in a housing, according to some embodiments of this specification. For example... Figure 15 As shown, the top of the high-frequency acoustic unit 14 is flush with the outer surface of the housing 11, meaning the high-frequency acoustic unit is completely housed inside the housing 11, with a protrusion height of approximately 0 mm. With this configuration, when an input signal has a frequency of 15 kHz, the high-frequency sound wave output by the high-frequency acoustic unit 14 approximates a spherical wave, indicating good directivity of the high-frequency acoustic unit 14. (Comparison) Figure 14 and Figure 15 Therefore, compared to the condition where the high-frequency acoustic unit 14 protrudes from the housing 11, when the high-frequency acoustic unit 14 is embedded in the housing 11, the user's ear canal 101 (i.e., Figure 14 , Figure 15 The sound pressure at point C is relatively higher, the high-frequency sound waves are relatively more concentrated, and the user's listening volume is relatively higher. That is, when the high-frequency acoustic unit 14 is embedded in the housing 11, the user's listening volume in the ear canal is relatively higher, and the high-frequency output effect of the acoustic output device 10 is relatively better.

[0094] Figure 16This is a schematic diagram illustrating the directivity of the high-frequency acoustic unit when the high-frequency acoustic unit and the housing are in different positions, according to some embodiments of this specification. Figure 17 This is a schematic diagram showing the frequency response curves of the high-frequency acoustic unit when it is positioned differently from the housing, according to some embodiments of this specification. Figure 16 The image in the image corresponds to a high-frequency acoustic unit 14 with an input signal frequency of 15kHz.

[0095] Please refer to Figure 16 curve L 161 Curve L represents the far-field directivity distribution of the high-frequency acoustic unit 14 when it protrudes from the housing 11. 162 This indicates the far-field directivity distribution of the high-frequency acoustic unit 14 when it is embedded within the housing 11. For example... Figure 16 As shown, curve L 161 Relatively rounded, curve L 162 Relatively sharp, curve L 162 It has better directional accuracy. In the 90° direction, curve L... 162 It is clearly convex from curve L 161 In the direction relative to 90°, curve L 161 It is clearly convex from curve L 162 That is, although the high-frequency acoustic unit 14 can achieve good directivity when it protrudes from the housing 11, when the high-frequency acoustic unit 14 is embedded in the housing 11, its far-field sound pressure level is relatively smaller and its near-field sound pressure level is relatively larger, which makes the listening volume in the user's ear canal relatively larger and the far-field sound leakage smaller.

[0096] Depend on Figure 16 It can be seen that curve L 161 With curve L 162 The peak values ​​are all in the 90° direction. For curve L... 161 With curve L 162 By reducing the peak value by 3dB, respectively, the curve L can be improved. 161 Two points are obtained on curve L. 162 Two points are obtained on the curve, and the angle range between these two points is the -3dB beamwidth of the corresponding curve. In some embodiments, curve L... 161 The -3dB beamwidth is 141°, and the curve L 162 The -3dB beamwidth is 101°. Compared to curve L... 161 curve L 162 The -3dB beamwidth is smaller, and the curve L 162 It has better directionality.

[0097] Please refer to Figure 17 curve L171 This represents the frequency response curve of the high-frequency acoustic unit 14 when it protrudes from the housing 11. Curve L 172 This represents the frequency response curve of the high-frequency acoustic unit 14 when it is embedded within the housing 11. For example... Figure 17 As shown, in the high-frequency range (e.g., above 8kHz), curve L... 172 Position relative to curve L 171 Approximately 2dB. That is, in the high-frequency range (e.g., above 8kHz), compared to when the high-frequency acoustic unit 14 protrudes from the housing 11, the output sound pressure level of the high-frequency acoustic unit 14 is increased by approximately 2dB when it is embedded within the housing 11.

[0098] In summary, compared to the configuration where the high-frequency acoustic unit 14 protrudes from the housing 11, when the high-frequency acoustic unit 14 is embedded within the housing 11, the high-frequency output effect of the high-frequency acoustic unit 14 is better, and the user's listening volume is higher. However, when the high-frequency acoustic unit 14 is completely embedded within the housing 11, the reflection of high-frequency sound waves is smaller, but the loss of high-frequency sound waves is greater, which to some extent affects the propagation distance of high-frequency sound waves.

[0099] In some embodiments, in order to improve the acoustic output performance of the acoustic output device 10 at high frequencies while reducing the loss of high-frequency sound waves, the projected area and the non-projected area are flush (i.e., the height difference between the projected area and the non-projected area in the thickness direction Z of the housing 11 is 0 mm). Due to possible processing and installation errors, the projected area and the non-projected area may not be perfectly flush. In some embodiments, when the height difference between the projected area and the non-projected area in the thickness direction Z of the housing 11 is less than 0.6 mm, the projected area and the non-projected area can be considered approximately flush.

[0100] In some embodiments, to improve the high-frequency acoustic output performance of the acoustic output device 10 and increase the user's listening volume, the ratio of the height difference between the projected area and the non-projected area in the thickness direction Z of the housing 11 to the thickness of the housing 11 can be less than 0.6. In some embodiments, to further improve the high-frequency acoustic output performance of the acoustic output device 10, the ratio of the height difference between the projected area and the non-projected area in the thickness direction Z of the housing 11 to the thickness of the housing 11 can be 0-0.3. In some embodiments, to further increase the user's listening volume, the ratio of the height difference between the projected area and the non-projected area in the thickness direction Z of the housing 11 to the thickness of the housing 11 can be 0-0.1.

[0101] It should be noted that the aforementioned Figures 14-17In the analysis of the output performance of the acoustic output device 10 when the high-frequency acoustic unit 14 protrudes / is embedded in the housing 11, the analysis is based on an auricle model of "standard" shape and size as a reference. In practical applications, due to the different ear shapes (e.g., shape and size) of different users, the position of the acoustic output device 10 when worn also varies, and the distance from the sound guide hole of the high-frequency acoustic unit 14 to the user's ear canal differs when worn. Consequently, the output performance of the acoustic output device 10 when the high-frequency acoustic unit 14 protrudes / is embedded in the housing 11 may also change. If the user's ear size is large, and the distance between the sound guide hole corresponding to the high-frequency acoustic unit 14 and the user's ear canal is far when worn, the high-frequency output effect of the acoustic output device 10 will be affected due to the path loss of high-frequency sound waves. Conversely, when the high-frequency acoustic unit 14 protrudes from the housing 11, the distance between the sound guide hole corresponding to the high-frequency acoustic unit 14 and the user's ear canal is closer; when the high-frequency acoustic unit 14 is embedded in the housing 11, the distance between the sound guide hole corresponding to the high-frequency acoustic unit 14 and the user's ear canal is farther. Therefore, the design of the high-frequency acoustic unit 14 being embedded in the housing 11 (e.g., flush with the housing 11) is more suitable for users with smaller ears, while the user experience is relatively poor for users with larger ears. Conversely, the design of the high-frequency acoustic unit 14 protruding from the housing 11 effectively reduces the distance between the high-frequency acoustic unit 14 and the ear canal of the user with the corresponding sound guide hole, thus allowing users with different ear shapes to obtain better listening results.

[0102] In some embodiments, to ensure that the acoustic output device 10 can adapt to more user ear shapes, and to ensure that the high-frequency acoustic unit 14 has a small gap with the user's ear canal when the acoustic output device 10 is worn, thus guaranteeing the acoustic output effect, the high-frequency acoustic unit 14 can be designed to protrude from the housing 11. In some embodiments, the degree of protrusion of the high-frequency acoustic unit 14 relative to the inner surface IS can be represented by the height difference between the projected area and the non-projected area in the thickness direction Z. In some embodiments, when the height difference between the projected area and the non-projected area in the thickness direction Z is not less than 0.6 mm, it can be determined that the high-frequency acoustic unit 14 protrudes from the housing 11. That is, when the distance between the top of the high-frequency acoustic unit 14 and the outer surface of the housing 11 in the thickness direction Z is not less than 0.6 mm, it can be determined that the high-frequency acoustic unit 14 protrudes from the housing 11. In some embodiments, the height difference between the projected area and the non-projected area in the thickness direction Z of the housing 11 is no greater than 4 mm, to avoid the high-frequency acoustic unit 14 protruding too much from the housing 11, affecting the wearing of the acoustic output device 10, and causing interference between the sound guide hole (e.g., the first sound guide hole 111) and the user's ear structure, affecting the listening effect. That is, when the high-frequency acoustic unit 14 protrudes from the housing 11, the height difference between the projected area and the non-projected area in the thickness direction Z can be 0.6 mm-4 mm. When the high-frequency acoustic unit 14 protrudes from the housing 11, the higher the degree of protrusion of the projected area relative to the non-projected area, the easier it is for the high-frequency acoustic unit 14 to approach the user's ear canal, thereby improving the user's listening volume. In some embodiments, when the high-frequency acoustic unit 14 protrudes from the housing 11, in order to further improve the user's listening volume, the height difference between the projected area and the non-projected area in the thickness direction Z of the housing 11 can be 1.5 mm-3 mm. In some embodiments, when the high-frequency acoustic unit 14 protrudes from the housing 11, in order to further ensure the wearing of the acoustic output device 10 and the listening effect, the height difference between the projection area and the non-projection area can be 2mm-2.5mm.

[0103] In some embodiments, the degree of protrusion of the high-frequency acoustic unit 14 relative to the inner surface IS can also be represented by the ratio of the height difference between the projected and non-projected areas in the thickness direction Z to the thickness dimension of the housing 11 in the thickness direction Z. In some embodiments, when the high-frequency acoustic unit 14 protrudes from the housing 11, in order to ensure that the acoustic output device 10 has a better acoustic output effect at high frequencies and to ensure the user's listening volume, the ratio of the height difference between the projected and non-projected areas in the thickness direction Z to the thickness dimension of the housing 11 is greater than 0.05. In some embodiments, when the high-frequency acoustic unit 14 protrudes from the housing 11, in order to further ensure the wearing of the acoustic output device 10 and to ensure the listening effect, the ratio of the height difference between the projected and non-projected areas in the thickness direction Z to the thickness dimension of the housing 11 can be 0.06-0.12. In some embodiments, when the high-frequency acoustic unit 14 protrudes from the housing 11, in order to further improve the user's listening volume, the ratio of the height difference between the projected and non-projected areas to the thickness dimension of the housing 11 can be 0.08-0.09.

[0104] In some embodiments, the high-frequency acoustic unit 14 may also employ a moving iron transducer to enhance the acoustic output performance of the acoustic output device 10.

[0105] Figures 18A-18D These are schematic diagrams showing the housings at different locations corresponding to some embodiments of this specification, illustrating the high-frequency acoustic unit. Figure 19A These are schematic diagrams of the frequency response curves of acoustic output devices corresponding to different positions of the high-frequency acoustic unit as shown in some embodiments of this specification. Figure 19B yes Figure 19A A magnified schematic diagram of the mid-to-high frequency curves.

[0106] In some embodiments, the high-frequency acoustic unit 14 may be disposed at one end of the housing 11 in the minor axis direction Y. In some embodiments, the high-frequency acoustic unit 14 may be disposed on the outer side of the housing 11, such as the upper side US, the lower side LS, etc. Figure 18A As shown. In some embodiments, the high-frequency acoustic unit 14 may be disposed on the inner side of the corresponding side wall (e.g., the upper side US, the lower side LS, etc.) of the housing 11. The sound guide hole (e.g., the third sound guide hole 113) corresponding to the high-frequency acoustic unit 14 may be disposed directly facing the inner side IS.

[0107] In some embodiments, the high-frequency acoustic unit 14 may be disposed at one end of the housing 11 in the long axis direction X. In some embodiments, the high-frequency acoustic unit 14 may be disposed on the outer side of the housing 11. In this case, since one end of the housing 11 in the long axis direction X is the connection end CE of the support structure 12, the high-frequency acoustic unit 14 may be disposed on the rear side RS of the housing 11, such as... Figure 18B As shown. In some embodiments, the high-frequency acoustic unit 14 may be disposed on the inner side of the corresponding side wall of the housing 11 (e.g., the connection end CE, the rear side RS, etc.). The sound guide hole (e.g., the third sound guide hole 113) corresponding to the high-frequency acoustic unit 14 may be disposed directly facing the inner side IS.

[0108] In some embodiments, the high-frequency acoustic unit 14 may be disposed below the low-frequency acoustic unit 13 in the thickness direction Z. That is, in the thickness direction Z, the high-frequency acoustic unit 14 is closer to the outer surface OS than the low-frequency acoustic unit 13. In some embodiments, since the outer surface OS of the housing 11 may have structures such as control buttons and touch areas, the high-frequency acoustic unit 14 may be disposed inside the housing 11. Since the inner surface IS of the housing 11 is close to the user's ear canal, and the low-frequency acoustic unit 13 is disposed between the high-frequency acoustic unit 14 and the inner surface IS, in order to allow the sound of the high-frequency acoustic unit 14 to be output toward the user's ear canal, a sound guide may also be disposed inside the housing 11. One end of the sound guide is acoustically coupled to one side of the diaphragm of the high-frequency acoustic unit 14, and the other end of the sound guide is disposed toward the inner surface IS, such as... Figure 18C As shown.

[0109] In some embodiments, the high-frequency acoustic unit 14 may be disposed above the low-frequency acoustic unit 13 in the thickness direction Z. That is, in the thickness direction Z, the high-frequency acoustic unit 14 is closer to the inner surface IS than the low-frequency acoustic unit 13. In some embodiments, the high-frequency acoustic unit 14 may be disposed on the outer side of the housing 11, that is, the high-frequency acoustic unit 14 may be disposed on the inner surface IS, such as... Figure 18D As shown. In some embodiments, the high-frequency acoustic unit 14 may be disposed on the inner side of the corresponding side wall (i.e., the inner side IS) of the housing 11. The orientation of the sound guide hole (e.g., the third sound guide hole 113) corresponding to the high-frequency acoustic unit 14 may be the same as the orientation of the first sound guide hole 111.

[0110] In some embodiments, when the acoustic output device 10 is Figure 8 When worn as shown, the rear side RS of the shell 11 extends into the concha cavity. At this time, the frequency response curves of the acoustic output device 10 corresponding to the high-frequency acoustic unit 14 in different positions are as follows: Figure 19A and Figure 19B As shown. Please refer to... Figure 19A and Figure 19B curve L 191 This is the frequency response curve of the acoustic output device when the low-frequency acoustic unit 13 is working alone; curve L 192 This is the frequency response curve of the acoustic output device when the high-frequency acoustic unit 14 is working alone; curve L 193 yes Figure 18AThe frequency response curve of the acoustic output device when the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 work simultaneously; curve L 194 yes Figure 18B The frequency response curve of the acoustic output device when the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 work simultaneously; curve L 195 yes Figure 18C The frequency response curve of the acoustic output device when the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 work simultaneously; curve L 196 yes Figure 18D The frequency response curves of the acoustic output device when the corresponding low-frequency acoustic unit 13 and high-frequency acoustic unit 14 work simultaneously. For example... Figure 19A and Figure 19B As shown, compared to curve L without the high-frequency acoustic unit 14, 191 Curve L, equipped with high-frequency acoustic unit 14 193 Curve L 194 Curve L 195 With curve L 196 Sensitivity at high frequencies (e.g., above 8kHz) is improved. That is, the inclusion of the high-frequency acoustic unit 14 effectively enhances the acoustic output performance of the acoustic output device 10 in the high-frequency range. Compared to curve L... 193 Curve L 194 With curve L 195 curve L 196 The overall sensitivity is the highest. That is, in Figures 18A-18D Of the four setting locations shown, Figure 18D The structure of the high-frequency acoustic unit 14 shown, which is located on the inner side IS, can better improve the acoustic output effect of the acoustic output device 10.

[0111] Some embodiments of this specification also provide another acoustic output device, which includes: a low-frequency acoustic unit, a high-frequency acoustic unit, a housing, and a support structure. The structures of the low-frequency acoustic unit, high-frequency acoustic unit, housing, and support structure of this acoustic output device are similar to or identical to the structures of the low-frequency acoustic unit 13, high-frequency acoustic unit 14, housing 11, and support structure 12 disposed in the acoustic output device 10. The difference between this acoustic output device and the acoustic output device 10 is that, in addition to the first and second sound guide holes corresponding to the low-frequency acoustic unit and the third sound guide hole corresponding to the high-frequency acoustic unit, the housing 11 may also include another sound guide hole (e.g., a fourth sound guide hole) corresponding to the high-frequency acoustic unit. The third and fourth sound guide holes are respectively disposed on both sides of the diaphragm of the high-frequency acoustic unit. The high-frequency acoustic unit can radiate sound through the third and fourth sound guide holes respectively. The third and fourth sound guide holes also form a dipole, enhancing the far-field sound leakage reduction of the acoustic output device and improving the output effect of the acoustic output device. For more information about the acoustic output device, please refer to the aforementioned description of the acoustic output device 10, which will not be repeated here.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] In some embodiments, numbers describing the quantity of components and attributes are used. It should be understood that such numbers used in the description of embodiments are modified in some examples with the terms "approximately," "approximately," or "generally." Unless otherwise stated, "approximately," "approximately," or "generally" indicates that the numbers are allowed to vary by ±20%. Accordingly, 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, numerical parameters should take into account specified significant digits and employ a general method of digit reservation. Although the numerical ranges and parameters used to confirm their breadth of scope in some embodiments of this application are approximate values, in specific embodiments, such values ​​are set as precisely as feasible.

[0116] 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 output device, comprising: Low-frequency acoustic unit; High-frequency acoustic unit; A housing configured to at least support the low-frequency acoustic unit and the high-frequency acoustic unit, the housing including an inner surface opposite the anterior outer surface of the user's ear when worn, the inner surface of the housing including a projected area and a non-projected area of ​​the high-frequency acoustic unit; and A support structure is connected to the housing and configured to place the housing near the ear canal without blocking the ear canal opening, wherein at least a portion of the housing extends into the user's concha and forms a cavity-like structure with the concha; The housing is provided with at least two sound guide holes. The first sound guide hole and the second sound guide hole are acoustically coupled to both sides of the diaphragm of the low-frequency acoustic unit, respectively. The low-frequency acoustic unit radiates sound to the outside of the housing through the first sound guide hole and the second sound guide hole. The first sound guide hole is provided on the inner side. One of the at least two sound guide holes is acoustically coupled to one side of the diaphragm of the high-frequency acoustic unit. The high-frequency acoustic unit radiates sound to the outside of the housing through the one sound guide hole. When worn, the sound guide hole corresponding to the high-frequency acoustic unit faces the user's ear canal.

2. The acoustic output device according to claim 1, wherein, The sound guide hole is the first sound guide hole. The first sound guide hole is acoustically coupled to one side of the diaphragm of the low-frequency acoustic unit and one side of the diaphragm of the high-frequency acoustic unit. The first sound guide hole is located on the inner side. The low-frequency acoustic unit and the high-frequency acoustic unit radiate sound to the user's ear canal through the first sound guide hole.

3. The acoustic output device according to claim 1, wherein, The ratio between the distance between the second sound guide hole and the ear canal opening and the distance between the first sound guide hole and the ear canal opening is in the range of 1.2-8.

4. The acoustic output device according to claim 1, wherein, The distance between the first sound guide hole and the opening of the ear canal ranges from 0.5cm to 2.5cm.

5. The acoustic output device according to claim 1, wherein, The distance between the second sound guide hole and the first sound guide hole is 4mm-15.11mm.

6. The acoustic output device according to claim 1, wherein, When worn, the end of the shell away from the connection between the support structure and the shell extends into the user's concha cavity.

7. The acoustic output device according to any one of claims 1-6, wherein, In the thickness direction of the housing, the projected area protrudes beyond the non-projected area.

8. The acoustic output device according to claim 7, wherein, In the thickness direction of the housing, the height difference between the projected area and the non-projected area is not less than 0.6 mm.

9. The acoustic output device according to any one of claims 1-6, wherein, In the thickness direction of the shell, the ratio of the height difference between the projected area and the non-projected area to the thickness of the shell is greater than 0.

05.

10. The acoustic output device according to any one of claims 1-6, wherein, The first sound guide hole is disposed on the inner side surface; The housing includes a short axis direction and a long axis direction. In the short axis direction of the housing, the centroid of the projection of the high-frequency acoustic unit onto the inner side is closer to the upper side of the housing than the centroid of the projection of the low-frequency acoustic unit onto the sound guide hole on the inner side.

11. The acoustic output device according to any one of claims 1-6, wherein, The minimum resonant frequency corresponding to the high-frequency acoustic unit is not less than 5kHz.

12. The acoustic output device according to any one of claims 1-6, wherein, The minimum resonant frequency corresponding to the low-frequency acoustic unit is no higher than 1kHz.

13. The acoustic output device according to any one of claims 1-6, wherein, The difference between the minimum resonant frequency of the high-frequency acoustic unit and the minimum resonant frequency of the low-frequency acoustic unit is not less than 4 kHz.

14. The acoustic output device according to any one of claims 1-6, wherein, The ratio of the minimum resonant frequency of the high-frequency acoustic unit to the minimum resonant frequency of the low-frequency acoustic unit is not less than 5.

15. The acoustic output device according to any one of claims 1-6, wherein, The ratio of the height difference between the projected area and the non-projected area in the thickness direction of the shell to the thickness of the shell is less than 0.3.

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