Acoustic output device

Abstract

An acoustic output device, comprising: a housing and a supporting structure, wherein the housing may be worn, by means of the supporting structure, at a position near a user's ear canal without blocking the ear canal opening. A low-frequency acoustic unit and a high-frequency acoustic unit are provided inside the housing, and the housing is provided with at least two sound-guiding holes, a first sound-guiding hole and a second sound-guiding hole among the at least two sound-guiding holes respectively being acoustically coupled to two sides of a diaphragm of the low-frequency acoustic unit, and one of the at least two sound-guiding holes being acoustically coupled to one side of a diaphragm of the high-frequency acoustic unit; in a worn state, the sound-guiding hole corresponding to the high-frequency acoustic unit faces the user's ear canal. By providing the high-frequency acoustic unit and making the sound-guiding hole corresponding thereto face the user's ear canal, the high-frequency sound volume in the user's ear canal can be increased, thereby remedying the problem of insufficient output of the acoustic output device in medium and high frequency bands, and enabling the acoustic output device to have better acoustic output effects in all the frequency bands.

Description

Acoustic output device Technical Field

[0001] This specification relates to the field of acoustics, and in particular to an acoustic output device. Background Art

[0002] 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 head-mounted, ear-hook and in-ear types. Traditional in-ear or head-mounted headphones cover or block the user’s ear canal, affecting the user’s experience in some scenarios. For example, it is difficult for users to hear external sounds in scenarios such as running, cycling, swimming, etc., and wearing them for a long time will also cause discomfort. The frequency response curve of current open-type headphones has a large attenuation amplitude in the mid-to-high frequency band (such as the frequency band after 8kHz), which makes the mid-to-high frequency sound muffled and the output effect poor.

[0003] Therefore, it is necessary to provide an acoustic output device with better output performance.

[0004] Summary of the Invention

[0005] An embodiment of the present specification provides an acoustic output device, comprising: a low-frequency acoustic unit; a high-frequency acoustic unit; a shell configured to carry at least the low-frequency acoustic unit and the high-frequency acoustic unit; and a support structure configured to allow the shell to be worn near the ear canal but not to block the ear canal opening; wherein, the shell 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 are acoustically coupled to both sides of the diaphragm of the low-frequency acoustic unit, respectively, and the low-frequency acoustic unit radiates sound to the outside of the shell through the first sound guide hole and the second sound guide hole; one of the at least two sound guide holes is acoustically coupled to one side of the diaphragm of the high-frequency acoustic unit, and the high-frequency acoustic unit radiates sound to the outside of the shell through the one sound guide hole, and when worn, the sound guide hole corresponding to the high-frequency acoustic unit faces the user's ear canal.

[0006] Additional features will be described in part in the following description and will become apparent to those skilled in the art by reference to the following and accompanying drawings, or may be learned by practice or operation of the examples. The features of this specification may be realized and obtained by practicing or using the various aspects of the methods, tools, and combinations described in the following detailed examples. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] This specification will be further described in the form of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting, and in these embodiments, like numbers represent like structures, wherein:

[0008] FIG1 is a schematic diagram of an exemplary auricle according to some embodiments of the present application;

[0009] FIG2 is an exemplary framework diagram of an acoustic output device according to some embodiments of this specification;

[0010] FIG3 is a schematic diagram of an exemplary wearing method of an acoustic output device according to some embodiments of this specification;

[0011] FIG4 is a schematic diagram of the interior of a housing according to some embodiments of this specification;

[0012] FIG5A is a schematic diagram of frequency response curves of an acoustic output device under different conditions according to some embodiments of this specification;

[0013] FIG5B is an enlarged schematic diagram of the high frequency curve in FIG5A ;

[0014] FIG6 is a schematic diagram of the external outline of a housing according to some embodiments of this specification;

[0015] 7A-7C are schematic diagrams showing the positions of a first sound guide hole and a third sound guide hole according to some embodiments of this specification;

[0016] FIG8 is a schematic diagram of a wearing state in which the housing of the acoustic output device is extended into the concha cavity according to some embodiments of this specification;

[0017] FIG9 is a schematic diagram of an acoustic model formed by an acoustic output device according to some embodiments of this specification;

[0018] FIG10 is a schematic diagram of frequency response curves of an acoustic output device corresponding to different arrangement positions of a high-frequency acoustic unit according to some embodiments of this specification;

[0019] FIG11 is a schematic diagram of an exemplary wearing method of an acoustic output device according to other embodiments of this specification;

[0020] FIG12 is a schematic diagram of an acoustic model formed by an acoustic output device according to some other embodiments of this specification;

[0021] FIG13 is a schematic diagram of the positions of an acoustic output device and an ear according to some embodiments of this specification;

[0022] FIG14 is a schematic diagram showing the distribution of high-frequency sound waves when the high-frequency acoustic unit is protruding from the housing according to some embodiments of this specification;

[0023] FIG15 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;

[0024] FIG16 is a schematic diagram of the directivity of the high-frequency acoustic unit when the high-frequency acoustic unit and the housing are at different positions according to some embodiments of this specification;

[0025] FIG17 is a schematic diagram of a frequency response curve of the high-frequency acoustic unit when the high-frequency acoustic unit and the housing are at different positions according to some embodiments of this specification;

[0026] 18A-18D are schematic diagrams of high-frequency acoustic units disposed in corresponding housings at different positions according to some embodiments of this specification;

[0027] FIG19A is a schematic diagram of frequency response curves of an acoustic output device corresponding to high-frequency acoustic units disposed at different positions according to some embodiments of this specification;

[0028] FIG19B is an enlarged schematic diagram of the mid-high frequency curve of FIG19A . DETAILED DESCRIPTION

[0029] In order to more clearly illustrate the technical solutions of the embodiments of this specification, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of this specification. For ordinary technicians in this field, this specification can also be applied to other similar scenarios based on these drawings without paying any creative work. It should be understood that these exemplary embodiments are provided only to enable technicians in the relevant fields to better understand and implement this specification, and do not limit the scope of this specification in any way. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0030] As used in this specification and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not specifically refer to the singular and may also include the plural, unless the context clearly indicates an exception. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been explicitly identified, and these steps and elements do not constitute an exclusive list. The method or apparatus may also include other steps or elements. The term "based on" means "at least in part based on." The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment."

[0031] In the description of this specification, it should be understood that the terms "front", "rear", "ear hook", "rear hook", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They 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, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this specification.

[0032] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout this specification, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0033] In this specification, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this specification based on specific circumstances.

[0034] An embodiment of the present specification provides an acoustic output device, which includes a housing and a support structure. The housing is worn near a user's ear canal through the support structure but does not block the ear canal opening, thereby keeping the user's ear canal open and allowing the user to receive external sounds while using the acoustic output device, thereby improving the user's experience. A low-frequency acoustic unit and a high-frequency acoustic unit are provided in the housing. At least two sound guide holes are provided on the housing. Two of the at least two sound guide holes (for example, 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, respectively. The low-frequency acoustic unit radiates sound to the outside of the housing 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. The high-frequency acoustic unit radiates sound to the outside of the housing through one sound guide hole. When the device is worn, the sound guide hole corresponding to the high-frequency acoustic unit faces the user's ear canal. By setting a high-frequency acoustic unit and directing its sound guide hole toward the user's ear canal, the volume of high-frequency sounds (for example, greater than 8kHz) in the user's ear canal can be increased, compensating for the problem of insufficient output of the acoustic output device in the mid- and high-frequency bands (for example, the frequency band greater than 8kHz), so that the acoustic output device has better acoustic output effects in the entire frequency band.

[0035] FIG1 is a schematic diagram of an exemplary auricle according to some embodiments of the present application. Referring to FIG1 , the auricle 100 may include an ear canal 101, a cavity concha 102, a cymba concha 103, a triangular fossa 104, an antihelix 105, a scaphoid 106, an auricle 107, an earlobe 108, and a crus helix 109. It should be noted that, for ease of description, in the embodiments of this specification, the crus 1011, the crus 1012, and the antihelix 105 are collectively referred to as the antihelix region. In some embodiments, one or more parts of the auricle 100 may be used to achieve wearability and stability of an acoustic device. In some embodiments, parts such as the ear canal 101, the cavity concha 102, the cymba concha 103, and the triangular fossa 104 have a certain depth and volume in three-dimensional space, which can be used to meet the wearing requirements of the acoustic device. For example, an acoustic device (e.g., an in-ear headphone) may be worn in the ear canal 101. In some embodiments, the acoustic device can be worn with the aid of other parts of the auricle 100 besides the ear canal 101. For example, the acoustic device can be worn with the aid of parts such as the cymba concha 103, the triangular fossa 104, the antihelix 105, the scaphoid 106, the helix 107, or a combination thereof. In some embodiments, in order to improve the comfort and reliability of the acoustic device in wearing, the user's earlobe 108 and other parts can also be further utilized. By using other parts of the auricle 100 besides the ear canal 101 to achieve the wearing of the acoustic device and the transmission 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 the user wears the acoustic device on the road, the acoustic device will not block the user's ear canal 101. The user can receive both the sound from the acoustic device and the sound from the environment (for example, horns, car bells, surrounding human voices, traffic control sounds, etc.), thereby reducing the probability of traffic accidents. For example, when the user wears the acoustic device, the entire or partial structure of the acoustic device can be located in front of the crus helix 109 (for example, the area M3 surrounded by the dotted line in FIG1 ). For another example, when the user wears the acoustic device, the entire or partial structure of the acoustic device can be in contact with the upper part of the ear canal 101 (for example, the location of one or more parts such as the crus helix 109, the cymba concha 103, the triangular fossa 104, the antihelix 105, the scaphoid 106, and the helix 107). For another example, when the user wears the acoustic device, the entire or partial structure of the acoustic device can be located in one or more parts of the auricle (for example, the cavum concha 102, the cymba concha 103, the triangular fossa 104, etc.) (for example, the area M1 surrounded by the dotted line in FIG1 , which includes at least the cymba concha 103 and the triangular fossa 104, and the area M2 which includes at least the cavum concha 102).

[0036] Different users may have individual differences, resulting in different shapes, sizes and other dimensional differences in the auricle 100. For the sake of ease of description and understanding, unless otherwise specified, this specification will mainly use an auricle model with a "standard" shape and size as a reference to further describe how the acoustic device in different embodiments is worn on the auricle model. For example, a simulator containing a head and its (left and right) auricles 100 made based on ANSI: S3.36, S3.25 and IEC: 60318-7 standards, such as GRAS45BCKEMAR, can be used as a reference for wearing the acoustic device, thereby presenting a scenario in which most users normally wear the acoustic device. In this application, descriptions such as "user wears", "in a wearing state" and "in a wearing state" may refer to the acoustic device described in this application being worn on the auricle 100 of the aforementioned simulator. Of course, taking into account the individual differences between different users, the structure, shape, size, thickness, etc. of one or more parts of the auricle 100 can be differentially designed according to the auricles 100 of different shapes and sizes. These differentiated designs can be manifested as characteristic parameters of one or more parts of the acoustic device (for example, the shell, support structure, etc. mentioned below) having different ranges of values ​​to adapt to different auricles 100. In addition, it should be noted that the "non-wearing state" is not limited to the state where the earphones are not worn on the user's auricle 100, but also includes the state where the earphones are not deformed by external forces; the "wearing state" is not limited to the state where the earphones are worn on the user's auricle 100, and the state where the support structure and the shell are unfolded to the same state as when worn (such as maintaining a corresponding distance between the structures) can also be regarded as the wearing state.

[0037] It should be noted that in fields such as medicine and anatomy, the human body can be defined as three basic planes: the sagittal plane, the coronal plane, and the horizontal plane, as well as three basic axes: the sagittal axis, the coronal axis, and the vertical axis. The sagittal plane is a plane perpendicular to the ground, drawn along the anterior-posterior direction of the body, dividing the body into left and right halves. The coronal plane is a plane perpendicular to the ground, drawn along the lateral direction of the body, dividing the body into anterior-posterior halves. The horizontal plane is a plane parallel to the ground, drawn along the lateral direction of the body, dividing the body into upper and lower halves. Accordingly, the sagittal axis is the axis along the lateral direction of the body and perpendicular to the coronal plane; the coronal axis is the axis along the lateral direction of the body and perpendicular to the sagittal plane; and the vertical axis is the axis along the lateral direction of the body and perpendicular to the horizontal plane. Furthermore, the "front side of the auricle" described herein is a concept relative to the "back side of the auricle." The former refers to the side of the auricle facing away from the head, while the latter refers to the side of the auricle facing toward the head. Both concepts refer to the user's auricle. Observing the auricle of the simulator along the coronal axis of the human body yields the frontal outline diagram shown in Figure 1.

[0038] The description of the auricle 100 is for illustrative purposes only and is not intended to limit the scope of this application. A person skilled in the art can make various changes and modifications based on the description of this application. For example, a portion of the structure of the acoustic device can block part or all of the ear canal 101. Such changes and modifications remain within the scope of protection of this application.

[0039] FIG2 is an exemplary framework diagram of an acoustic output device according to some embodiments of this specification, and FIG3 is an exemplary wearing diagram of an acoustic output device according to some embodiments of this specification.

[0040] In some embodiments, the acoustic output device 10 may include glasses, smart bracelets, headphones, hearing aids, smart helmets, smart watches, smart clothing, smart backpacks, smart accessories, etc., or any combination thereof. For example, the acoustic output device 10 may be functional myopia glasses, reading glasses, cycling glasses or sunglasses, etc., or may be intelligent glasses, such as audio glasses with headphone function. The acoustic output device 10 may also be a helmet, an augmented reality (AR) device, or a virtual reality (VR) device, etc., such as a head-mounted device. In some embodiments, the augmented reality device or virtual reality device may include a virtual reality helmet, virtual reality glasses, an augmented reality helmet, augmented reality glasses, etc., or any combination thereof. For example, the virtual reality device and / or augmented reality device may include Google Glass, Oculus Rift, Hololens, Gear VR, etc.

[0041] 2 and 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 the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 are both disposed in the housing 11. The low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 cooperate to achieve acoustic output of the acoustic output device 10.

[0042] The shell 11 is connected to the support structure 12 and is used to carry the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14. In some embodiments, the shell 11 can be a closed shell structure with a hollow interior, and the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 are located inside the shell 11. In some embodiments, the acoustic output device 10 can be combined with products such as glasses, headphones, head-mounted display devices, AR / VR helmets, etc. In this case, the shell 11 can be fixed near the user's auricle 100 by hanging or clamping. In some alternative embodiments, a hanging structure (e.g., a hook) may be provided on the shell 11. For example, the shape of the hook matches the shape of the auricle, and the acoustic output device 10 can be worn independently on the user's auricle 100 through the hook.

[0043] In some embodiments, the housing 11 may be a housing structure having a shape adapted to the human auricle 100, such as a circular ring, an elliptical shape, a racetrack shape, a polygon (regular or irregular), a U-shape, a V-shape, a semicircular shape, or other regular or irregular shapes, so that the housing 11 can be directly attached to the user's auricle 100. In some embodiments, the housing 11 may also include a fixing structure. The fixing structure may include an ear hook, an elastic band, etc., so that the acoustic output device 10 can be better worn on the user and prevent the user from dropping it during use.

[0044] In some embodiments, the shell 11 may have a long axis direction X, a short axis direction Y and a thickness direction Z that are orthogonal to each other. Among them, the long axis direction X can be defined as the direction with a larger extension dimension in the shape of the two-dimensional projection surface of the shell 11 (for example, the projection of the shell 11 on the plane of its inner side (the side close to the auricle 100) or the projection on the sagittal plane) (for example, when the projection shape is a rectangle or an approximate rectangle, the long axis direction is the length direction of the rectangle or the approximate rectangle). For ease of explanation, this specification will be described with the projection of the shell on the sagittal plane. The short axis direction Y can be defined as the direction perpendicular to the long axis direction X in the shape of the projection of the shell 11 on the sagittal plane (for example, when the projection shape is a rectangle or an approximate rectangle, the short axis direction is the width direction of the rectangle or the approximate rectangle). 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 to the left and right directions of the body.

[0045] In conjunction with Figures 1, 2, and 3, in some embodiments, when the user wears the acoustic output device 10, at least a portion of the shell 11 may be located in the area M3 in front of the tragus of the user's ear 100 shown in Figure 1 or the anterior and lateral surface areas M1 and M2 of the auricle. It should be noted that the anterior and lateral surface of the auricle mentioned in the embodiments of this specification refers to the side of the auricle facing away from the head along the coronal axis, and correspondingly, the posterior and medial surface of the auricle refers to the side of the auricle facing the human head along the coronal axis. In some embodiments, at least two sound guide holes may be provided on the shell 11 for transmitting sound. In some embodiments, two of the at least two sound guide holes are acoustically coupled to the two sides of the diaphragm of the low-frequency acoustic unit 13, respectively, and the low-frequency acoustic unit 13 radiates sound to the outside of the shell 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 shell 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.

[0046] In some embodiments, when the shell 11 is worn, it can be located on the side of the user's ear facing the human facial area along the sagittal axis, that is, the position of the solid line frame A in Figure 3. At this time, the shell 11 is located in the human facial area M3 in front of the user's ear, and the long axis of the shell 11 can be in a vertical or approximately vertical state, the projection of the short axis direction Y on the sagittal plane is consistent with the direction of the sagittal axis, the projection of the long axis direction X on the sagittal plane is consistent with the direction of the vertical axis, and the thickness direction Z is perpendicular to the sagittal plane. In some embodiments, when the shell 11 is in an inclined state in the worn state (such as the position shown in the dotted line frame B in Figure 3), the long axis direction X and the short axis direction Y are still parallel or approximately parallel to the sagittal plane, the long axis direction X can have a certain angle with the direction of the sagittal axis, that is, the long axis direction X is also tilted accordingly, the short axis direction Y can have a certain angle with the direction of the vertical axis, that is, the short axis direction Y is also tilted, and 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 cavity 102 has a certain volume and depth, there is a certain distance between the inner side of the acoustic output device 10 and the concha cavity. The ear canal can be connected to the outside world through the leakage structure between the inner side and the concha cavity, thereby freeing the user's ears. At the same time, the shell 11 of the acoustic output device 10 and the concha cavity can cooperate to form an auxiliary cavity connected to the ear canal. In some embodiments, at least one sound guide hole can be at least partially located in the aforementioned auxiliary cavity. The sound outputted by the sound guide hole will be restricted by the aforementioned auxiliary cavity. That is, the aforementioned auxiliary cavity can gather sound, allowing more sound to be transmitted into the ear canal, thereby increasing the volume and quality of the sound heard by the user in the near field, thereby improving the acoustic effect of the acoustic output device 10. In some embodiments, the housing 11 can also be in a horizontal or approximately horizontal position when worn, as shown in the dashed box C in Figure 3. In this case, the housing 11 is at least partially located at the antihelix 105. The long axis X of the housing 11 can be aligned or approximately aligned with the sagittal axis, both pointing in the front-to-back direction of the body. The short axis Y can be aligned or approximately aligned with the vertical axis, both pointing in the up-down direction of the body. The thickness direction Z is perpendicular to the sagittal plane. This prevents the housing 11 from obstructing the ear canal, thereby freeing the user's ears. It also increases the contact area between the housing 11 and the auricle 100, thereby improving the wearing comfort of the earphone 10. It should be noted that when worn, the housing 11 in the approximately horizontal position shown in the dashed box C in Figure 3 can mean that the angle between the long axis X of the housing 11 and the sagittal axis shown in the dashed box C in Figure 3 is within a specific range (e.g., no greater than 20°). In addition, the wearing position of the housing 11 is not limited to positions A, B, C, etc. shown in Figure 3, and can be any of the areas M3, M1, or M2 shown in Figure 1. For example, the entire or partial structure of the housing 11 may be located in the area M3 surrounded by the dotted line in FIG. 1 .For another example, the entirety or a portion of the shell 11 may contact the upper portion of the ear canal 101 (e.g., the location of one or more portions such as the crus helix 109, the cymba concha 103, the triangular fossa 104, the antihelix 105, the scaphoid 106, and the helix 107). For another example, the entirety or a portion of the shell 11 may be located within a cavity formed by one or more portions of the auricle 100 (e.g., the cavum concha 102, the cymba concha 103, the triangular fossa 104, etc.) (e.g., the region M1 enclosed by the dotted line in FIG. 1 , which includes at least the cymba concha 103 and the triangular fossa 104, and the region M2 which includes at least the cavum concha 102).

[0047] In some embodiments, the support structure 12 is configured to allow the housing 11 to be worn near the user's ear canal but without blocking the ear canal opening, allowing the user's auricle 100 to remain open, allowing the user to 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 a pair of glasses, the support structure 12 can be a temple; when the acoustic output device 10 is a bracelet, the support structure 12 can be a band; when the acoustic output device 10 is a head-mounted device, the support structure 12 can be a helmet, etc.

[0048] In some embodiments, taking the acoustic output device 10 as an open-ear headphone as an example, the corresponding support structure 12 can be an ear hook, which can include a first portion 121 and a second portion 122, which are connected in sequence. When worn, the first portion 121 of the support structure 12 is hung between the user's auricle and head, and the second portion 122 extends toward the side of the auricle away from the head and connects to the housing 11, so that the housing 11 is worn near the ear canal but does not block the ear canal.

[0049] In some embodiments, to improve the stability of the acoustic output device 10 when worn, 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 may be configured as a contoured structure that conforms to at least one of the back 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, thereby increasing the resistance of the acoustic output device 10 to falling off the auricle 100. Second, at least a portion of the support structure 12 may be configured as an elastic structure, allowing it to deform to a certain extent when worn, thereby increasing the positive pressure exerted by the support structure 12 on the auricle 100 and / or the head, thereby increasing the resistance of the acoustic output device 10 to falling off the auricle 100. Third, the support structure 12 is at least partially configured to rest against the head when worn, generating a reaction force that compresses the auricle 100, causing the housing 11 to press against the anterior and lateral surfaces of the auricle 100 (e.g., areas M1 and M2 shown in FIG1 ), thereby increasing resistance to the acoustic output device 10 falling off the auricle 100. Fourth, the housing 11 and support structure 12 are configured to clamp the areas of the antihelix 105 and the cavum concha, etc., from both the anterior and posterior medial surfaces of the auricle 100 when worn, thereby increasing resistance to the acoustic output device 10 falling off the auricle 100. Fifth, the housing 11 or an auxiliary structure connected thereto is configured to at least partially extend into cavities such as the cavum concha 102, the cymba concha 103, the triangular fossa 104, and the scaphoid 106, thereby increasing resistance to the acoustic output device 10 falling off the auricle 100.

[0050] In some embodiments, the support structure 12 can have an arcuate structure that conforms to the interface between the user's head and the pinna 100, allowing the support structure 12 to be positioned between the user's pinna 100 and head. For example, the first portion 121 of the support structure 12 connects the second portion 122 to the housing 11, so that the acoustic output device 10 is curved in three-dimensional space when not worn (i.e., in its natural state). In other words, in three-dimensional space, the second portion 122, first portion 121, and housing 11 are not coplanar. This arrangement allows the second portion 122 to be positioned between the back of the user's pinna 100 and their head when the acoustic output device 10 is worn, while the housing 11 contacts the front of the user's pinna 100 (e.g., region M3 in FIG. 1 ) or the pinna 100 (e.g., regions M1 and M2 in FIG. 1 ). The housing 11 and second portion 122 cooperate to clamp the pinna 100. Specifically, the first portion 121 can extend from the head toward the outside of the head, and then cooperate with the second portion 122 to provide the housing 11 with a pressing force on the front side of the auricle 100 or the auricle 100. Under the action of the pressing force, the housing 11 can be pressed against the front side of the auricle 100 or the area where the cavum concha 102, cymba concha 103, triangular fossa 104, antihelix 105, and the like are located, so that the acoustic output device 10 does not block the ear canal 101 of the auricle 100 when the acoustic output device 10 is in the worn state.

[0051] 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-conducted sound waves or air-conducted 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 having good acoustic output performance in a 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 having good acoustic output performance in a high-frequency range, so as to improve the high-frequency output performance of the acoustic output device 10. Among them, the low-frequency range can refer to a frequency range less than 8 kHz, and the high-frequency range can refer to a frequency range greater than 8 kHz. In some embodiments, the low-frequency range and the high-frequency range can also have different standards based on actual conditions. For example, the low frequency range may also refer to a frequency range not higher than 1 kHz, such as 1 Hz-1 kHz, 100 Hz-800 Hz, etc.; the high frequency range may also refer to a frequency range not lower than 5 kHz, such as 5 kHz-10 kHz, 8 kHz-16 kHz, etc.

[0052] In some embodiments, according to 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 coil transducers, moving iron transducers, flat plate transducers, piezoelectric transducers, etc. Among them, the dynamic coil transducer has a higher transduction efficiency, higher sensitivity, and better overall sound quality, but the output effect in the high-frequency range is poor. The moving iron transducer has a higher sensitivity, but the flat range of the frequency response curve is smaller, and the structure is precise, the cost is high, the structure is narrow and long, and the design is difficult. The piezoelectric transducer has a higher transduction efficiency and higher sensitivity, but requires a high voltage to drive the piezoelectric element, and the frequency response curve is not flat at high frequencies, and the vibration mode has large peaks and troughs. The diaphragm of the flat plate transducer is subjected to more uniform force everywhere, which better avoids the generation of split vibration, thereby better avoiding the distortion of the output sound, and the output effect in the high-frequency range is better.

[0053] Based on the above analysis, in some embodiments, the low-frequency acoustic unit 13 may use a dynamic transducer to ensure that the low-frequency acoustic unit 13 has a good acoustic output in the low-frequency range. In some embodiments, the high-frequency acoustic unit 14 may use a flat-plate transducer to ensure that the high-frequency acoustic unit 14 has a good acoustic output in the high-frequency range.

[0054] In some embodiments, the minimum resonant frequency corresponding to the high-frequency acoustic unit 14 is not less than 5 kHz, and the minimum resonant frequency corresponding to the low-frequency acoustic unit 13 is not greater than 1 kHz. Through the above configuration, the low-frequency acoustic unit 13 can have a large output in the low- to medium-frequency range (e.g., 1 kHz-8 kHz), while the high-frequency acoustic unit 14 can have a large output in the high-frequency range (e.g., above 8 kHz). As a result, the acoustic output device 10 has a good acoustic output effect across the entire frequency range (e.g., above 1 kHz).

[0055] 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 over a medium and low frequency range, the minimum resonant frequency corresponding to the low-frequency acoustic unit 13 may be smaller, 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 higher acoustic output effect within the high-frequency frequency range, the minimum resonant frequency corresponding to the high-frequency acoustic unit 14 can be larger, 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 can be no less than 8 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 can be no less than 20.

[0056] FIG4 is a schematic diagram of the interior of a housing according to some embodiments of the present specification, FIG5A is a schematic diagram of the frequency response curves of an acoustic output device according to some embodiments of the present specification under different conditions, and FIG5B is an enlarged schematic diagram of the high frequency curve in FIG5A. As shown in FIG5A and FIG5B, the curve L 52 The frequency response curve of the acoustic output device 10 when only the low-frequency acoustic unit 13 is working is shown in FIG. 53 The frequency response curve of the acoustic output device 10 when only the high-frequency acoustic unit 14 is working is shown in FIG. 54It 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 work simultaneously. In some embodiments, as shown in FIG4 , the low-frequency acoustic unit 13 can be arranged in the shell 11, and the high-frequency acoustic unit 14 can be arranged in the shell 11 and protrude from the surface of the shell 11. Among them, the low-frequency acoustic unit 13 is a dynamic transducer; the high-frequency acoustic unit 14 is a flat-plate transducer, and the resonant frequency of the high-frequency acoustic unit 14 can be located at 8 kHz. The voltage of the input signal of the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 is both 0.5 V, and the phase is the same. In some embodiments, the frequency response curves in FIG5A and FIG5B can be measured by a microphone, and the microphone can be set at a position 4 mm away from the sound guide hole corresponding to the user's ear canal in the wearing state, and the direction is the direction in which the corresponding sound guide hole points to the user's ear in the wearing state. When the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 are operating simultaneously, the position of the corresponding sound guide hole can be the middle position between the sound guide hole of the two sound guide holes corresponding to the low-frequency acoustic unit 13, the sound guide hole closest to the user's ear canal when worn, and the sound guide hole corresponding to the high-frequency acoustic unit 14 (for example, the midpoint of the line connecting the centers of the two). 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 setting position is the center of the larger of the two overlapping sound guide holes.

[0057] As shown in FIG5A and FIG5B, in the frequency range of low frequency (for example, below 800 Hz), the curve L 52 With curve L 54 This indicates that the low-frequency sound (e.g., below 800 Hz) of the acoustic output device 10 is mainly output by the low-frequency acoustic unit 13, and the setting of the high-frequency acoustic unit 14 has a negligible effect on the low-frequency output of the low-frequency acoustic unit 13. 52 A sharp attenuation begins to appear at 7kHz, indicating that the output performance of the low-frequency acoustic unit 13 in the high-frequency range (for example, above 8kHz) is poor. 53 The output is low at low frequencies, but increases steadily after 1.2kHz, and remains high after 7kHz with less attenuation, indicating that the high-frequency acoustic unit 14 has good output performance at high frequencies (e.g., above 8kHz). 54 It can be regarded as curve L 52 With curve L 53 The curve after superimposing the fitting, curve L 53 For curve L 52 Provide compensation in the attenuation section (for example, above 7kHz), curve L 54 Before 7kHz, it is basically the same as curve L 52 Coincident, curve L 54After 7kHz, it is basically the same as curve L 53 The overlap indicates that the addition of the high-frequency acoustic unit 14 in the acoustic output device 10 can ensure the low-frequency output effect of the acoustic output device 10 while stably improving the output sound pressure level of the high frequency (for example, above 8kHz), so that the acoustic output device 10 has a good output effect in the entire frequency band. 54 With curve L 52 It can be seen that in the frequency range above 8kHz, the curve L 54 Ratio curve L 52 The 10dB-15dB increase indicates that the provision of the high-frequency acoustic unit 14 can increase the output sound pressure level of the acoustic output device 10 at high frequencies (eg, above 8kHz) by 10dB-15dB, and the high-frequency enhancement effect is very significant.

[0058] 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 two sides of the diaphragm of the low-frequency acoustic unit 13, respectively. The low-frequency acoustic unit 13 radiates sound to the exterior 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 waves on one side of the diaphragm of the low-frequency acoustic unit 13 (or referred to as the first sound waves) can be emitted through one of the two sound guide holes, and the sound waves on the other side of the diaphragm of the low-frequency acoustic unit 13 (or referred to as the second sound waves) can be emitted through the other of the two sound guide holes. In some embodiments, the two sound guide holes can emit two groups of sound waves with a phase difference (for example, opposite phases) to form a dipole, which can interfere and destructively interfere at a spatial point (for example, 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 medium and low frequency range (for example, 100Hz-800Hz).

[0059] In some embodiments, one of the at least two sound guide holes can be acoustically coupled with 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 shell 11 through the one sound guide hole. When in the worn state, the sound guide hole corresponding to 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 shell 11 through only one sound guide hole, forming a monopole. In some embodiments, within the mid-to-high frequency range (for example, 800Hz-10kHz), the design of the monopole makes the high-frequency acoustic unit 14 have better directionality. Combined with the setting of the corresponding sound guide hole facing the user's ear canal, the user's ear can enhance the listening effect of the third sound wave output by the high-frequency acoustic unit 14, so that a larger volume can be received at the opening of the user's ear canal, so that the user can get a clear listening effect. By disposing 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 (eg, 8kHz-16kHz) can be improved, thereby ensuring the full-band output effect of the acoustic output device 10.

[0060] In some embodiments, the sound guide hole corresponding to the high-frequency acoustic unit 14 can be a third sound guide hole (for example, the third sound guide hole 113) that is different from the two sound guide holes (for example, 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 (for example, the third sound guide hole 113) does not overlap with the aforementioned two sound guide holes (for example, the first sound guide hole 111 and the second sound guide hole 112), so that the design position of the third sound guide hole (for example, the third sound guide hole 113) is flexible, which improves the installation flexibility of the high-frequency acoustic unit 14, so that the third sound guide hole corresponding to the high-frequency unit 14 can be closer to the user's ear canal when worn, thereby ensuring the high-frequency output effect. In some embodiments, the sound guide hole corresponding to the high-frequency acoustic unit 14 may also be one of the two sound guide holes corresponding to the low-frequency acoustic unit 13 (e.g., the first sound guide hole 111 and the second sound guide hole 112). That is, the sound guide hole corresponding to the high-frequency acoustic unit 14 may partially overlap or completely overlap with one of the two sound guide holes corresponding to the low-frequency acoustic unit 13 (e.g., the first sound guide hole 111 and the second sound guide hole 112). This 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 corresponding to the low-frequency acoustic unit 13 (e.g., the first sound guide hole 111 and the second sound guide hole 112), the third sound guide hole may not overlap (i.e., have no overlapping portion) or partially overlap with one of the two sound guide holes corresponding to the low-frequency acoustic unit 13 (e.g., the first sound guide hole 111 or the second sound guide hole 112). 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 the sound guide hole that completely overlaps with it can be collectively regarded as one sound guide hole.

[0061] It should be understood that the framework diagram provided in FIG2 is for illustrative purposes only and is not intended to limit the scope of this application. For those skilled in the art, various deformations and modifications can be made under the guidance of this application. And these deformations and modifications will fall within the scope of protection applied for. In some embodiments, the number of components shown in the figure can be adjusted according to actual conditions. In some embodiments, one or more elements shown in FIG2 may be omitted, or one or more other elements may be added or deleted. For example, the acoustic output device 10 may not include the support structure 12, and the shell 11 may have the wearing and fixing function of the support structure 12. In some embodiments, an element may be replaced by other components that can achieve similar functions. In some embodiments, an element may be split into multiple sub-elements, or multiple elements may be merged into a single element. For example, the shell 11 and the support structure 12 may be merged into one element.

[0062] Figure 6 is a schematic diagram of the outer contour of a housing according to some embodiments of the present specification, and Figures 7A-7C are schematic diagrams of the positions of the first and third sound guide holes according to some embodiments of the present specification. As shown in Figures 4 and 6, in some embodiments, the 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 the two sides of the diaphragm of the low-frequency acoustic unit 13, respectively. In some embodiments, the first sound guide hole 111 can be provided on the side of the housing 11 facing the auricle. The diaphragm of the low-frequency acoustic unit 13 can separate 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 then transmit it to the user's ear canal, so that the user can hear the sound. In some embodiments, a portion of the sound guided through the first sound guide hole 111 can be transmitted to the ear canal so that the user can hear the sound, and another portion of the sound can be transmitted together with the sound reflected from the ear canal through the gap between the shell 11 and the ear (for example, a portion of the concha cavity not covered by the shell 11) to the outside of the acoustic output device 10 and the ear, thereby forming a first sound leakage in the far field; at the same time, a second sound guide hole 112 can be opened on the other side of the shell 11 (for example, the side away from or facing away from the user's ear canal), and the second sound guide hole 112 can be opened on the other side of the shell 11 (for example, the side away from or facing away from the user's ear canal). The sound hole 112 is farther away from the ear canal than the first sound guide hole 111. The sound transmitted from the second sound guide hole 112 generally forms a second sound leakage in the far field. The intensity of the aforementioned first sound leakage is equivalent to the intensity of the aforementioned second sound leakage, and the phase of the aforementioned first sound leakage and the phase of the aforementioned second sound leakage are (close to) opposite to each other, so that the two can cancel each other out in the far field, which is conducive to achieving the sound leakage reduction effect of the acoustic output device 10 at low frequencies, so that the acoustic output device 10 has a dipole directivity in low frequencies (for example, 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 arranged toward the user's ear canal. The high-frequency acoustic unit 14 outputs the third sound wave only through the third sound guide hole 113, and the third sound guide hole 113 serves as the sound source of the third sound wave. Since the wavelength of the high-frequency sound waves 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 considered a point sound source, but rather a surface sound source. The sound field received at a certain position in the far field of the acoustic output device 10 can be considered 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 the receiving position is related to the frequency and wavelength. The higher the frequency of the third sound wave, the sharper the sound field directivity of the high-frequency acoustic unit 14, and the better the directivity.The frequency of the third sound wave output by the high-frequency acoustic unit 14 through the third sound guide hole 113 is higher, so its directivity is also better, which can improve the user's ear listening effect of the third sound wave output by the high-frequency acoustic unit 14 and ensure the output effect of the acoustic output device 10 in the full frequency band.

[0063] In some embodiments, the first sound guide hole 111, the second sound guide hole 112, and the third sound guide hole 113 are respectively located at different positions on the shell 11. In some embodiments, in order to enhance the listening volume of the user's ear canal opening, the first sound guide hole 111 and the third sound guide hole 113 can be set at a position on the shell 11 closer to the user's ear canal opening, such as the side wall of the shell 11 facing the user's ear canal opening. The second sound guide hole 112 can be set at a position on the shell 11 away from the user's ear canal opening, such as the side wall of the shell 11 facing away from the user's ear canal opening, so as to avoid the second sound wave derived therefrom from destructively interfering with the first sound wave derived from the first sound guide hole 111 near the user's ear canal opening, thereby affecting the listening effect. In some embodiments, as shown in Figures 7A-7C, the first sound guide hole 111 and the third sound guide hole 113 can be set on the same side wall of the shell 11, so that the first sound guide hole 111 and the third sound guide hole 113 are both set towards the user's ear canal opening, thereby enhancing the listening volume of the user's ear canal opening. In some embodiments, as shown in FIG7A , on the side wall where the first sound guide hole 111 is provided, the third sound guide hole 113 can be provided at any position other than the first sound guide hole 111 , which not only reduces the difficulty of designing the third sound guide hole 113 toward the user's ear canal opening, but also makes the setting position of the high-frequency acoustic unit 14 more flexible.

[0064] 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 arranged relatively away from the user's ear canal opening. For example, the first side wall of the housing 11 faces the user's ear canal opening, the first sound guide hole 111 can be located on the first side wall of the housing 11, and the second sound guide hole 112 can be located on a third side wall opposite to the first side wall and away from the user's ear canal opening, or the second sound guide hole 112 can be located on a second side wall adjacent to the first side wall 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 by the first sound guide hole 111 and the sound output by the second sound guide hole 112 that meet specific conditions (for example, a phase difference of approximately 180°) can form dipole-like radiation. In the far field, the sound output by the first sound guide hole 111 and the sound output by 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 low-frequency sound output by the acoustic output device 10 from being heard by people nearby.

[0065] When the user wears the sound-emitting device, in order 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, 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 increased as much as possible. 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, in order 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 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 in the range of 1.2-8. 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 of the distance between the second sound guide hole 112 and the user's ear canal opening to 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 of the distance between the second sound guide hole 112 and the user's ear canal opening to 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.

[0066] In some embodiments, to ensure that the user can hear a loud 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. The distance between the first sound guide hole 111 and the user's ear canal opening can refer to the distance between the center of the first sound guide hole 111 and the center position of the user's ear canal opening, or the distance between the center of the first sound guide hole 111 and the plane where the user's ear canal opening is located. 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 that the ear canal opening is open, the first sound guide hole 111 needs to maintain a certain distance from the ear canal opening. The distance between the first sound guide hole 111 and the user's ear canal opening can range from 0.5 cm to 2.5 cm. In some embodiments, in order to further ensure the opening of the ear canal, the distance between the first sound guide hole 111 and the user's ear canal opening can be in the range of 1 cm to 3.1 cm.

[0067] When the 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 by the second sound guide hole 112 near the user's ear canal opening will cancel out the sound output by the first sound guide hole 111. In order to ensure the listening volume at the user's ear canal opening and reduce the sound leakage volume in the far field, 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. In addition, if the distance between the first sound guide hole 111 and the second sound guide hole 112 is too large, or the distance between the second sound guide hole 112 and the ear canal opening is too large, the volume of the sound-emitting device will be too large, 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 range from 1.5 cm to 7 cm. 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 distance between the second sound guide hole 112 and the user's ear canal opening can be in the range of 2.5 cm to 4 cm.

[0068] In some embodiments, to prevent the second sound wave emitted by the second sound guide hole 112 from canceling out the first sound wave emitted by the first sound guide hole 111 in the near field and affecting the user's listening quality, the distance between the second sound guide hole 112 and the first sound guide hole 111 cannot be too close. The distance between the second sound guide hole 112 and the first sound guide hole 111 may refer to the distance between the center of the second sound guide hole 112 and the center of the first sound guide hole 111. In some embodiments, the distance between the second sound guide hole 112 and the first sound guide hole 111 may be 4mm-15.11mm. In some embodiments, to further ensure the user's listening quality, the distance between the second sound guide hole 112 and the first sound guide hole 111 may be 8mm-10mm.

[0069] 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 arrangement of the third sound guide hole 113 toward the user's ear canal, the user's ear canal opening can receive more high-frequency sounds, ensuring that the sound pressure level received at the user's ear canal opening is sufficiently large, thereby ensuring a high-frequency listening effect. 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 the user's high-frequency listening effect, 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 that the ear canal opening is open, the third sound guide hole 113 needs to maintain a certain distance from the ear canal opening. The distance between the third sound guide hole 113 and the user's ear canal opening can range from 0.1 cm to 1.5 cm. In some embodiments, to further ensure that the ear canal opening is 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.

[0070] 1 , 3 and 6 , in some embodiments, the shell 11 may include a side wall facing the front and outer side of the user's auricle (also referred to as the inner side IS) and a side wall facing away from the front and outer side of the user's auricle (also referred to as the outer side OS).

[0071] In some embodiments, in the worn state, the inner side surface IS faces the auricle along the thickness direction Z, and the outer side surface OS faces away from the auricle along the thickness direction Z. In some embodiments, the shell 11 may further include a connecting surface connecting the inner side surface IS and the outer side surface OS. It should be noted that: in the worn state, when observed along the thickness direction Z, the shell 11 can be set to a circular, elliptical, rounded square, rounded rectangle or the like. Among them, when the shell 11 is set to a circular, elliptical or other shape, the above-mentioned connecting surface may refer to the arc-shaped side surface of the shell 11; and when the shell 11 is set to a rounded square, rounded rectangle or the like shape, the above-mentioned connecting surface may include the lower side surface LS, the upper side surface US and the rear side surface RS. Therefore, for the sake of convenience of description, this embodiment takes the shell 11 set to a rounded rectangle as an example for illustrative explanation. Among them, the length of the shell 11 in the major axis direction X may be greater than the width of the shell 11 in the minor axis direction Y. As shown in Figures 3 and 6, the shell 11 can have an upper side surface US facing away from the ear canal 101 along the short axis direction Y and a lower side surface LS facing the ear canal 101 when worn, and a rear side surface RS connecting the upper side surface US and the lower side surface LS. The rear side surface RS is located at one end facing the back of the head in the long axis direction X when worn.

[0072] 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 side IS, thereby enabling 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, above the side, etc.) or below (e.g., directly below, below the side, etc.) the low-frequency acoustic unit 13 in the thickness direction Z, that is, the high-frequency acoustic unit 14 is closer to the outer side OS or the inner side IS than the low-frequency acoustic unit 13 in the thickness direction Z. In some embodiments, the second sound guide hole 112 can be arranged on other side walls of the shell 11 away from the user's ear (such as the upper side US, the rear side RS, the outer side OS, etc.), so that the second sound guide hole 112 has an appropriate distance from the user's ear canal opening to ensure the listening volume at the user's ear canal opening and the leakage reduction effect of the low-frequency acoustic unit 13 in the far field.

[0073] Referring to Figure 7C , in some embodiments, the first sound guide hole 111 can 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 considered as one sound guide hole, with the larger of the first and third sound guide holes 111, 113, being the sound guide hole. Taking the first sound guide hole 111 as an example, the first sound guide hole 111 is acoustically coupled to both 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 toward the user's ear canal through the first sound guide hole 111.

[0074] Referring to FIG. 7B , in some embodiments, the first sound guide hole 111 may also partially overlap with the third sound guide hole 113. In this case, the first sound guide hole 111 and the third sound guide hole 113 may also be considered as one sound guide hole, which includes a first region (i.e., the non-overlapping portion of the first sound guide hole 111), a second region (i.e., the non-overlapping portion of the third sound guide hole 113), and a third region (i.e., the overlapping portion of the first sound guide hole 111 and the third sound guide hole 113). The first and third regions of the sound guide hole are acoustically coupled to one side of the diaphragm of the low-frequency acoustic unit 13, and the low-frequency acoustic unit 13 radiates sound toward the user's ear canal through the first and third regions of the sound guide hole. The second and third regions of the sound guide hole are acoustically coupled to one side of the diaphragm of the high-frequency acoustic unit 14, and the high-frequency acoustic unit 14 radiates sound toward the user's ear canal through the second and third regions of the sound guide hole.

[0075] Referring to Figure 7A , when the first sound guide hole 111 and the third sound guide hole 113 do not overlap, the third sound guide hole 113 can be positioned anywhere other than the first sound guide hole 111. This reduces the difficulty of aligning the third sound guide hole 113 with the user's ear canal opening and provides greater flexibility in the placement of the high-frequency acoustic unit 14. Furthermore, the high-frequency acoustic unit 14 can be positioned protruding from the inner side IS of the housing 11 or embedded within the housing 11 corresponding to the inner side IS, further enhancing the flexibility of its installation.

[0076] Referring to Figures 7B and 7C , when the first sound guide hole 111 and the third sound guide hole 113 overlap, they must be in the same plane. In this case, the high-frequency acoustic unit 14 can be embedded within the housing 11 corresponding to the inner side surface IS. The first sound guide hole 111 and the third sound guide hole 113 can be considered the same sound guide hole, and the design of a single sound guide hole simplifies the structure and reduces the difficulty of processing and design. Furthermore, since the high-frequency acoustic unit 14 is embedded within the housing 11, it does not protrude from the surface of the housing 11, resulting in a smooth and aesthetically pleasing surface.

[0077] In some wearing situations, since the third sound guide hole 113 and the first sound guide hole 111 are both located on the inner side surface IS, and the high-frequency acoustic unit 14 is located on the housing 11 corresponding to the inner side 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 further affecting the low-frequency listening volume in the user's ear canal. Therefore, the high-frequency acoustic unit 14 can be located as far away from the first sound guide hole 111 as possible.

[0078] In some embodiments, to prevent the high-frequency acoustic unit 14 from 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 surface 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 surface 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 low-frequency listening volume in the user's ear canal, the overlap ratio between the projected area of ​​the high-frequency acoustic unit 14 on the inner side surface 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 surface IS of the housing 11 may not exceed 8%. In some embodiments, in order to further ensure the low-frequency listening volume at the user's ear canal, the overlap ratio of the projected area of ​​the high-frequency acoustic unit 14 on the inner side surface IS of the shell 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 surface IS of the shell 11 may not exceed 5%.

[0079] In order to make the user's ear canal receive more high-frequency sounds, it is ensured that the sound pressure level received at the user's ear canal is large enough, thereby ensuring the high-frequency listening effect. In some embodiments, in the wearing state, on the inner side surface IS, the third sound guide hole 113 is closer to the user's ear canal than the first sound guide hole 111. The position of the third sound guide hole 113 corresponds to the setting position of the high-frequency acoustic unit 14 on the inner side surface IS of the shell 11, that is, 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 side surface IS can be represented by the centroid of the projection of the high-frequency acoustic unit 14 on the inner side surface IS, that is, the centroid of the projection of the high-frequency acoustic unit 14 on the inner side 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 side surface IS.

[0080] Figure 8 is a schematic diagram illustrating the housing of an acoustic output device extending into the cavum conchae according to some embodiments of this specification. Referring 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 worn, the first portion 121 of the support structure 12 is positioned between the user's auricle and head, while the second portion 122 of the support structure 12 extends toward the side of the auricle facing away from the head and connects to the connection end CE of the housing 11, thereby securing the housing 11 in place.

[0081] By extending the housing 11 at least partially into the cavum concha 102, the listening volume at the listening position (e.g., the ear canal), particularly the listening volume of mid- and low-frequency sounds, can be increased while still maintaining a good far-field sound leakage cancellation effect. For illustrative purposes only, when the entire or partial structure of the housing 11 extends into the cavum concha 102, the housing 11 and the cavum concha 102 form a structure similar to a cavity (hereinafter referred to as a quasi-cavity). In the embodiments of the specification, the quasi-cavity can be understood as a semi-enclosed structure enclosed by the side surfaces of the housing 11 and the cavum concha 102 structure. This semi-enclosed structure is not completely sealed and isolated from the external environment, but rather has a leakage structure (e.g., an opening, a gap, a pipe, etc.) that is acoustically connected to 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, may be provided on a side of the housing 11 that is close to 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, may be provided on other sides of the housing 11 (e.g., the outer side RS that is away from or facing 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 by the first sound guide hole 111 and the sound output by the second sound guide hole 112 can be approximately considered as two sound sources, the sound waves of these two sound sources having opposite phases. The corresponding inner walls of the housing 11 and the cavum conchae 102 form a cavity-like structure, wherein the sound source corresponding to the first sound guide hole 111 is located within the cavity-like structure, and the sound source corresponding to the second sound guide hole 112 is located outside the cavity-like structure, forming the acoustic model shown in FIG.

[0082] FIG9 is a schematic diagram of an acoustic model formed by an acoustic output device according to some embodiments of this specification. As shown in FIG9 , a cavity-like structure 402 may include a listening position and at least one sound source 401A. The term "include" here can mean that at least one of the listening position and sound source 401A is within the cavity-like structure 402, or at least one of the listening position and sound source 401A is located at the inner edge of the cavity-like structure 402. The listening position can be equivalent to the entrance of the ear canal, an acoustic reference point of the auricle, such as the ear reference point (ERP) or the ear-drum reference point (DRP), or an entrance structure that leads to the listener. Because 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 radiation or reflection. In contrast, without the cavity-like structure 402, most of the sound radiated from sound source 401A will not reach the listening position. Therefore, the provision of the cavity structure significantly increases the volume of sound reaching the listening position. At the same time, only a small portion of the anti-phase sound radiated by anti-phase sound source 401B outside cavity-like structure 402 enters cavity-like structure 402 through leakage structure 403 of cavity-like structure 402. This is equivalent to generating a secondary sound source 401B' at leakage structure 403, whose intensity is significantly lower than that of sound source 401B and also significantly lower than that of sound source 401A. The sound generated by secondary sound source 401B' has a weak anti-phase cancellation effect on sound source 401A within the cavity, significantly increasing the listening volume at the listening position. Regarding sound leakage, the sound radiated by sound source 401A to the outside world through the cavity's leakage structure 403 is equivalent to generating a secondary sound source 401A' at leakage structure 403. Since almost all of the sound radiated by sound source 401A is output from leakage structure 403, and the scale of cavity-like structure 402 is much smaller than the spatial scale of the sound leakage evaluation (at least an order of magnitude different), the intensity of secondary sound source 401A' can be considered comparable to that of sound source 401A. For the external space, the secondary sound source 401A' and the sound source 401B form a dual sound source to cancel each other out and reduce leakage sound.

[0083] In a specific application scenario, the outer wall surface of the shell 11 is usually a plane or a curved surface, while the contour of the user's concha 102 is an uneven structure. By extending part or all of the shell 11 into the concha 102, a cavity-like structure connected to the outside world is formed between the shell 11 and the contour of the concha 102. Furthermore, by setting the first sound guide hole 111 at a position of the shell 11 facing the user's ear canal and close to the edge of the concha 102 (for example, the inner side IS), and setting the second sound guide hole 112 at a position of the shell 11 away from or away from the ear canal, the acoustic model shown in Figure 9 can be constructed, so that the user can improve the listening position at the ear canal opening when wearing the acoustic output device 10, and reduce the far-field sound leakage effect.

[0084] As shown in FIG8 , when the shell 11 at least partially extends into the cavum concha, the shell 11 is tilted in the wearing state. For details, please refer to the relevant description of the dotted box B in FIG3 , which will not be repeated here. At this time, the connection end CE is closer to the user's ear canal, and the rear side surface RS is farther away from the user's ear canal than the connection end CE. Moreover, because it needs to abut the cavum concha, a portion of the inner side surface IS close to the rear side surface RS may contact the cavum concha. In some embodiments, the centroid of the projection of the high-frequency acoustic unit 14 on the inner side surface IS is closer to the connection end CE relative to the sound guide hole (first sound guide hole 111) of the low-frequency acoustic unit 13 on the inner side surface IS, so that the third sound guide hole 113 is closer to the user's ear canal relative to the first sound guide hole 111, thereby ensuring the directivity of the third sound guide hole 113 and thus ensuring the high-frequency listening effect.

[0085] In some embodiments, when the housing 11 is not inserted into the concha cavity, the housing 11 can be tilted when worn, with the corresponding connection end CE closer to the user's ear canal and the rear side RS farther away from the user's ear canal. In this case, 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.

[0086] FIG10 is a diagram showing a frequency response curve of an acoustic output device corresponding to different arrangement positions of a high-frequency acoustic unit according to some embodiments of this specification. 101 The frequency response curve of the acoustic output device 10 when the high-frequency acoustic unit 14 is arranged close to the connection end CE of the housing 11 is shown as curve L. 101 is a 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 The frequency response curve of the acoustic output device 10 when the high-frequency acoustic unit 14 is arranged close to the rear side RS of the housing 11 is shown as curve L. 102The frequency response curve of the acoustic output device 10 is 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 than the first sound guide hole 111. 101 With curve L 102 It can be seen that in the frequency range of 8kHz-10kHz, the curve L 101 Overall higher than curve L 102 , and the curve L 101 That is, when the centroid of the projection of the high-frequency acoustic unit 14 on the inner side surface IS is closer to the connection end CE relative to the sound guide hole (first sound guide hole 111) of the low-frequency acoustic unit 13 on the inner side surface IS, the output sound pressure level of the acoustic output device 10 at the user's ear canal is greater and the sound quality is higher.

[0087] Please refer to Figures 6 and 8. In some embodiments, in the short axis direction Y of the shell 11, the centroid of the projection of the high-frequency acoustic unit 14 on the inner side surface 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 surface IS, that is, the centroid of the projection of the high-frequency acoustic unit 14 on the inner side surface IS is closer to the upper side surface 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, resulting in a reduction in the sound output by the low-frequency acoustic unit 13 through the first sound guide hole 111, thereby affecting the low-frequency listening volume at the user's ear canal. In some embodiments, the centroid of the projection of the high-frequency acoustic unit 14 on the inner surface IS can be located directly above the first sound guide hole 111 in the short axis direction Y; or, the centroid of the projection of the high-frequency acoustic unit 14 on the inner surface IS can also be located obliquely above the first sound guide hole 111 and close to the connection end CE in the short axis direction Y; or, the centroid of the projection of the high-frequency acoustic unit 14 on the inner surface IS can also be located obliquely above the first sound guide hole 111 and close to the rear side surface RS in the short axis direction Y.

[0088] It should be noted that when worn, the free end of the housing 11 (i.e., the rear side surface RS of the housing 11) can project orthographically onto the antihelix, or onto the left and right sides of the head, and in front of the auricle on the human sagittal axis. In other words, the support structure 12 can support the housing 11 in various wearing positions, such as the concha, the antihelix, the front side of the auricle, or the back side of the auricle, making the acoustic output device 10 suitable for a variety of different wearing styles. For the acoustic output device 10 in some wearing styles (such as wearing in the concha or the back side of the auricle), the centroid of the projection of the high-frequency acoustic unit 14 on the inner side surface IS is closer to the connection between the support structure 12 and the housing 11 (i.e., the connection end CE) than the centroid of the projection of the sound guide hole (first sound guide hole 111) of the low-frequency acoustic unit 13 on the inner side surface IS. This allows the third sound guide hole 113 to be closer to the user's ear canal relative to the first sound guide hole 111, thereby ensuring a high-frequency listening experience.

[0089] In some different wearing styles, the placement of the high-frequency acoustic unit 14 may also be changed to bring it closer to the user's ear canal than the first sound guide hole 111. The following detailed description takes the acoustic output device 10 shown in FIG11 as an example. It should be noted that, without violating the corresponding acoustic principles, the structure and corresponding parameters of the acoustic output device 10 in FIG11 can also be applied to the acoustic output device 10 mentioned above in which the housing 11 can be extended into the concha cavity.

[0090] FIG11 is a schematic diagram showing an exemplary wearing method of an acoustic output device according to other embodiments of the present specification.

[0091] Referring to Figure 11, in some embodiments, when the acoustic output device 10 is worn, at least a portion of the housing 11 can cover the user's antihelix region, wherein the antihelix region can include any one or more of the antihelix 105, the crus superioris, and the crus inferioris shown in Figure 1. In this case, the housing 11 is located above the cavum concha 102 and the ear canal opening, and the user's ear canal opening is open. In some embodiments, the housing 11 can 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 back cavity of the acoustic output device 10. The sound output by the first sound guide hole 111 and the sound output by the second sound guide hole 112 can be approximately considered as two point sound sources, the sounds of the two point sound sources having opposite phases, forming 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 shell 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 shell 11 away from or away from the user's ear canal opening. This arrangement allows the user's ear canal to be completely open, ensuring the listening effect of the acoustic output device 10 while allowing the user to hear external sounds more clearly, thereby improving the effect of open listening. In the worn state, the inner side IS of the shell 11 is abutted against the antihelix area. The concave and convex structure of the antihelix area can act as a baffle, which will increase the sound path of the sound emitted by the second sound guide hole 112 to the external auditory canal, thereby increasing the sound path difference between the first sound guide hole 111 and the second sound guide hole 112 to the external auditory canal, reducing the destructive interference between the first sound guide hole 111 and the second sound guide hole 112 at the listening position, and increasing the sound intensity at the near-field listening position.

[0092] As shown in Figure 11, by positioning the housing 11 at least partially near the user's antihelix 105, the output performance of the acoustic output device 10 can be improved. Specifically, the sound intensity at the near-field listening position is increased while ensuring far-field sound leakage reduction. This allows the sound emitted by the first sound guide hole 111 to be transmitted directly and unimpeded to the user's ear canal opening, while the sound emitted by the second sound guide hole 112 must bypass or pass through the housing 11, forming an acoustic model similar to that shown in Figure 12.

[0093] FIG12 is a schematic diagram of an acoustic model formed by an acoustic output device according to some other embodiments of this specification. As shown in FIG12 , when a baffle is provided between point sound source A1 and point sound source A2, in the near field, the sound field of point sound source A2 needs to bypass the baffle to interfere with the sound waves 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 source A1 and point sound source A2 have the same amplitude, the amplitude difference between the sound waves of point sound source A1 and point sound source A2 at the listening position increases compared to the case where no baffle is provided, thereby reducing the degree of cancellation of the two sounds at the listening position, thereby increasing the volume at the listening position. In the far field, since the sound waves generated by point sound source A1 and point sound source A2 do not need to bypass the baffle to interfere in a larger spatial range (similar to the case without a baffle), the sound leakage in the far field will not be significantly increased compared to the case where there is no baffle. Therefore, by providing a baffle structure around one of the point sound sources A1 and A2, the volume at the near-field listening position can be significantly increased without significantly increasing the volume of far-field sound leakage.

[0094] As shown in Figure 11, the inner side surface IS and the lower side surface LS of the housing 11 are relatively close to the user's ear canal. In order to place the high-frequency acoustic unit 14 close to the user's ear canal, in some embodiments, the high-frequency acoustic unit 14 can be disposed on the lower side surface LS of the housing 11, or at the junction of the lower side surface LS and the inner side surface IS of the housing 11, so that the third sound guide hole 113 of the high-frequency acoustic unit 14 can be better directed toward the user's ear canal, thereby increasing the high-frequency listening volume in the user's ear canal and compensating for the insufficient output of the acoustic output device 10 in the mid-to-high frequency band (e.g., the frequency band greater than 8kHz), thereby ensuring that the acoustic output device 10 has a good acoustic output effect across the entire frequency band.

[0095] Figure 13 is a schematic diagram illustrating the position of an acoustic output device relative to the ear, according to some embodiments of this specification. Referring to Figure 13 , 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 toward the user's anti-helix region, and the first sound guide hole 111 is positioned toward the user's anti-helix. In this case, the first sound guide hole 111 and the second sound guide hole 112 form a dipole, and the anti-helix region acts as a baffle, thereby increasing the volume of sound in the user's ear canal and ensuring optimal listening experience.

[0096] The high-frequency acoustic unit 14 outputs sound only through the third sound guide hole 113. As a monopole, the high-frequency sound waves it outputs have a relatively short wavelength. If the vibration direction N1 of the high-frequency acoustic unit 14 is set toward the user's antihelix area, 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 toward the user's ear canal, and the third sound guide hole 113 is set toward the user's ear canal.

[0097] 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, increase the sound path difference between the first sound guide hole 111 and the second sound guide hole 112 to the user's ear canal opening, and thus increase the low-frequency listening volume of the user's ear canal opening, the first sound guide hole 111 can be designed toward the user's ear canal, and the second sound guide hole 112 can be designed away from the user's ear canal or toward the antihelix. In some embodiments, the vibration direction N2 of the low-frequency acoustic unit 13 can be directed toward the user's antihelix area. 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 side surface IS or the outer side surface OS. At this time, the vibration direction N2 of the low-frequency acoustic unit 13 can be perpendicular or approximately perpendicular to the inner side surface IS or the outer side 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°.

[0098] The wavelength of the high-frequency sound waves output by the high-frequency acoustic unit 14 is short and easily absorbed. The different positions of the high-frequency acoustic unit 14 relative to the shell 11 (for example, embedded, flush, protruding, etc.) will affect the loss of the high-frequency sound waves reaching the user's ear canal, and further affect the output effect of the high-frequency sound waves of the high-frequency acoustic unit 14, thereby affecting the listening volume in the user's ear canal.

[0099] In some embodiments, the inner side surface IS of the shell 11 includes a projection area and a non-projection area of ​​the high-frequency acoustic unit 14, and in the thickness direction Z of the shell 11, the projection area protrudes from the non-projection area. In some embodiments, the projection area refers to the area covered by the projection of the high-frequency acoustic unit 14 on the inner side surface IS along the thickness direction Z; the non-projection area refers to the area on the inner side surface IS that is not covered by the projection of the high-frequency acoustic unit 14. The projection area protrudes from the non-projection area, which means that in the thickness direction Z, the high-frequency acoustic unit 14 is at least partially raised relative to the inner side surface IS, as shown in Figures 4, 6 and 14. By setting the high-frequency acoustic unit 14 to be raised relative to the inner side surface IS, the high-frequency acoustic unit 14 can easily approach the user's ear canal to improve the user's listening volume.

[0100] Figure 14 is a schematic diagram of the distribution of high-frequency sound waves when the high-frequency acoustic unit is protruding from the shell according to some embodiments of this specification. As shown in Figure 14, the bottom of the high-frequency acoustic unit 14 is substantially flush with the outer surface of the shell 11, that is, the high-frequency acoustic unit is completely protruding from the surface of the shell 11. With this arrangement, when a signal with a frequency of 15KHz is input, the high-frequency sound waves output by the high-frequency acoustic unit 14 are approximately spherical waves, the high-frequency acoustic unit 14 has good directivity, the sound pressure at the user's ear canal 101 (i.e., point C in Figure 14) is large, and the user's listening volume is large.

[0101] Figure 15 is a schematic diagram of the distribution of high-frequency sound waves when the high-frequency acoustic unit is embedded in the housing according to some embodiments of this specification. As shown in Figure 15, the top of the high-frequency acoustic unit 14 is flush with the outer surface of the housing 11, that is, the high-frequency acoustic unit is completely contained within the interior of the housing 11, and the protruding height is substantially 0mm. With this arrangement, when the input frequency is a signal of 15kHz, the high-frequency sound waves output by the high-frequency acoustic unit 14 are approximately spherical waves, and the high-frequency acoustic unit 14 has good directivity. Comparing Figures 14 and 15, it can be seen that compared to the condition in which 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 sound pressure at the user's ear canal 101 (i.e., point C in Figures 14 and 15) is relatively greater, 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 listening volume at the user's ear canal is relatively higher, and the high-frequency output effect of the acoustic output device 10 is relatively better.

[0102] Figure 16 is a schematic diagram illustrating the directivity of the high-frequency acoustic unit when the high-frequency acoustic unit is positioned at different positions relative to the housing, according to some embodiments of this specification. Figure 17 is a schematic diagram illustrating the frequency response curves of the high-frequency acoustic unit when the high-frequency acoustic unit is positioned at different positions relative to the housing, according to some embodiments of this specification. The image in Figure 16 corresponds to an input signal of 15 kHz for the high-frequency acoustic unit 14.

[0103] Please refer to Figure 16, curve L 161 The curve L represents the far-field directivity distribution of the high-frequency acoustic unit 14 when the high-frequency acoustic unit 14 protrudes from the housing 11. 162 The curve L represents the far-field directivity distribution of the high-frequency acoustic unit 14 when the high-frequency acoustic unit 14 is embedded in the housing 11. 161 Relatively rounded, curve L 162 Relatively sharp, curve L 162 The directivity is better. In the 90° direction, the curve L 162 Obviously protrudes from curve L 161 , in the direction relative to 90°, the curve L 161 Obviously protrudes from curve L 162 That is, although when the high-frequency acoustic unit 14 is protruding from the shell 11, it can also achieve good directivity, when the high-frequency acoustic unit 14 is embedded in the shell 11, its far-field sound pressure level is relatively smaller and the near-field sound pressure level is relatively larger, so that the listening volume at the user's ear canal is relatively larger and the sound leakage in the far field is smaller.

[0104] As shown in Figure 16, the curve L 161 With curve L 162 The peak values ​​are all at 90°. 161 With curve L 162 , respectively, with its peak position as the benchmark, reduced by 3dB, can be seen on the curve L 161 Get two points on the curve L 162 The angle range between the two points on the curve is the -3dB beamwidth of the corresponding curve. 161 The -3dB beamwidth is 141°, curve L 162 The -3dB beamwidth is 101°. Compared with curve L 161 , curve L 162 The -3dB beamwidth is smaller, curve L 162 The directionality is better.

[0105] Please refer to Figure 17, curve L 171 The frequency response curve of the high-frequency acoustic unit 14 when the high-frequency acoustic unit 14 protrudes from the housing 11 is shown in FIG. 172 The frequency response curve of the high frequency acoustic unit 14 when the high frequency acoustic unit 14 is embedded in the housing 11 is shown in FIG17 . As shown in FIG17 , in the high frequency range (eg, above 8 kHz), the curve L 172 The position ratio curve L 171That is, in the high frequency range (eg, above 8 kHz), the output sound pressure level when the high frequency acoustic unit 14 is embedded in the housing 11 is increased by about 2 dB compared to when the high frequency acoustic unit 14 is protruding from the housing 11 .

[0106] In summary, compared to a 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 in the housing 11, the reflection of high-frequency sound waves is small, but the high-frequency sound waves are lost more, which to some extent affects the propagation distance of the high-frequency sound waves.

[0107] In some embodiments, 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 projection area and the non-projection area are flush (i.e., the height difference between the projection area and the non-projection area in the thickness direction Z of the housing 11 is 0 mm). Due to possible processing and installation errors, the projection area and the non-projection area may not be absolutely flush. In some embodiments, when the height difference between the projection area and the non-projection area in the thickness direction Z of the housing 11 is less than 0.6 mm, the projection area and the non-projection area can be considered to be approximately flush.

[0108] In some embodiments, to improve the acoustic output performance of the acoustic output device 10 at high frequencies and increase the user's listening volume, the ratio of the height difference between the projection area and the non-projection area in the thickness direction Z of the housing 11 to the thickness of the housing 11 may be less than 0.6. In some embodiments, to further improve the acoustic output performance of the acoustic output device 10 at high frequencies, the ratio of the height difference between the projection area and the non-projection area in the thickness direction Z of the housing 11 to the thickness of the housing 11 may be 0-0.3. In some embodiments, to further increase the user's listening volume, the ratio of the height difference between the projection area and the non-projection area in the thickness direction Z of the housing 11 to the thickness of the housing 11 may be 0-0.1.

[0109] It should be noted that the analysis of the output performance of the acoustic output device 10 when the high-frequency acoustic unit 14 protrudes from or is embedded in the housing 11 in Figures 14-17 is based on a "standard" auricle model with a standard shape and size. In actual 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. The distance between the sound guide hole of the high-frequency acoustic unit 14 and the user's ear canal when worn also varies. In this case, the output performance of the acoustic output device 10 when the high-frequency acoustic unit 14 protrudes from or is embedded in the housing 11 may also vary. If the user's ear size is large, when the sound guide hole corresponding to the high-frequency acoustic unit 14 is far away from the user's ear canal when worn, the high-frequency output effect of the acoustic output device 10 will be affected due to the path loss of the high-frequency sound waves. When the high-frequency acoustic unit 14 protrudes from the shell 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 shell 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 embedded in the shell 11 (for example, flush with the shell 11) is relatively more suitable for users with smaller ears, and the user experience for users with larger ears is relatively poor. The design of the high-frequency acoustic unit 14 protruding from the shell 11 can effectively reduce the distance between the sound guide hole corresponding to the high-frequency acoustic unit 14 and the user's ear canal for users with larger or smaller ears, so that users with different ear shapes can all obtain better listening effects.

[0110] In some embodiments, to ensure that the acoustic output device 10 can adapt to a wider range of user ear shapes, and to ensure that the sound guide hole corresponding to the high-frequency acoustic unit 14 of the acoustic output device 10 is spaced relatively close to the user's ear canal when the device is worn, thereby ensuring 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 side 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 no 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 no less than 0.6 mm, it can be determined that the high-frequency acoustic unit 14 protrudes from the housing 11. In some embodiments, in the thickness direction Z of the shell 11, the height difference between the projection area and the non-projection area is no more than 4mm, so as to avoid the high-frequency acoustic unit 14 protruding too much from the shell 11, affecting the wearing of the acoustic output device 10, causing the sound guide hole (such as the first sound guide hole 111, etc.) and the user's ear structure to interfere with each other, affecting the listening effect. That is, when the high-frequency acoustic unit 14 protrudes from the shell 11, the height difference between the projection area and the non-projection area in the thickness direction Z can be 0.6mm-4mm. When the high-frequency acoustic unit 14 is designed to protrude from the shell 11, the higher the degree of protrusion of the projection area relative to the non-projection 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 is designed to protrude from the shell 11, in order to further improve the user's listening volume, the height difference between the projection area and the non-projection area in the thickness direction Z of the shell 11 can be 1.5mm-3mm. In some embodiments, when the high-frequency acoustic unit 14 is designed to protrude from the shell 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.

[0111] In some embodiments, the degree of protrusion of the high-frequency acoustic unit 14 relative to the inner side IS can also be represented by the ratio of the height difference between the projected area and the non-projected area 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 is designed to protrude from the housing 11, to ensure that the acoustic output device 10 has a better acoustic output effect at high frequencies while ensuring 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 dimension of the housing 11 is greater than 0.05. In some embodiments, when the high-frequency acoustic unit 14 is designed to protrude from the housing 11, to further ensure the wearability of the acoustic output device 10 and the listening quality, 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 dimension of the housing 11 can be 0.06-0.12. In some embodiments, when the high-frequency acoustic unit 14 is designed to protrude from the housing 11, to further improve the user's listening volume, the ratio of the height difference between the projected area and the non-projected area to the thickness dimension of the housing 11 can be 0.08-0.09.

[0112] In some embodiments, the high-frequency acoustic unit 14 may also adopt a moving iron transducer to enhance the acoustic output performance of the acoustic output device 10 .

[0113] Figures 18A-18D are schematic diagrams of shells corresponding to high-frequency acoustic units arranged at different positions according to some embodiments of this specification, Figure 19A is a schematic diagram of frequency response curves of acoustic output devices corresponding to high-frequency acoustic units arranged at different positions according to some embodiments of this specification, and Figure 19B is an enlarged schematic diagram of the mid-high frequency curves of Figure 19A.

[0114] In some embodiments, the high-frequency acoustic unit 14 can be disposed at one end of the housing 11 in the minor axis direction Y. In some embodiments, the high-frequency acoustic unit 14 can be disposed on the outside of the housing 11, such as the upper side surface US, the lower side surface LS, etc., as shown in FIG18A . In some embodiments, the high-frequency acoustic unit 14 can be disposed on the inner side of the corresponding side wall of the housing 11 (such as the upper side surface US, the lower side surface LS, etc.). The sound guide hole corresponding to the high-frequency acoustic unit 14 (such as the third sound guide hole 113) can be disposed directly toward the inner side surface IS.

[0115] In some embodiments, the high-frequency acoustic unit 14 can be disposed at one end of the shell 11 in the long axis direction X. In some embodiments, the high-frequency acoustic unit 14 can be disposed on the outside of the shell 11. At this time, since one end of the shell 11 in the long axis direction X is the connection end CE connected to the support structure 12, the high-frequency acoustic unit 14 can be disposed on the rear side RS of the shell 11, as shown in Figure 18B. In some embodiments, the high-frequency acoustic unit 14 can be disposed on the inner side of the corresponding side wall of the shell 11 (such as the connection end CE, the rear side RS, etc.). The sound guide hole corresponding to the high-frequency acoustic unit 14 (such as the third sound guide hole 113) can be directly disposed toward the inner side IS.

[0116] In some embodiments, the high-frequency acoustic unit 14 can be arranged 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 side surface OS relative to the low-frequency acoustic unit 13. In some embodiments, since the outer side surface OS of the shell 11 may be provided with structures such as control buttons and touch areas, the high-frequency acoustic unit 14 can be arranged inside the shell 11. Since the inner side surface IS of the shell 11 is close to the user's ear canal, and the low-frequency acoustic unit 13 is arranged between the high-frequency acoustic unit 14 and the inner side 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 conduit can also be provided in the shell 11, one end of the sound conduit is acoustically coupled to one side of the diaphragm of the high-frequency acoustic unit 14, and the other end of the sound conduit is arranged toward the inner side surface IS, as shown in FIG18C .

[0117] In some embodiments, the high-frequency acoustic unit 14 can 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 side surface IS than the low-frequency acoustic unit 13. In some embodiments, the high-frequency acoustic unit 14 can be disposed on the outer side of the shell 11, that is, the high-frequency acoustic unit 14 can be disposed on the inner side surface IS, as shown in FIG18D . In some embodiments, the high-frequency acoustic unit 14 can be disposed on the inner side of the corresponding side wall of the shell 11 (that is, the inner side surface IS). The orientation of the sound guide hole (e.g., the third sound guide hole 113) corresponding to the high-frequency acoustic unit 14 can be the same as the orientation of the first sound guide hole 111.

[0118] In some embodiments, when the acoustic output device 10 is worn in the manner shown in FIG8 , the rear side surface RS of the housing 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 at different settings are shown in FIG19A and FIG19B . Referring to FIG19A and FIG19B , the curve L 191 is the frequency response curve of the acoustic output device when the low-frequency acoustic unit 13 works alone; Curve L 192 is the frequency response curve of the acoustic output device when the high-frequency acoustic unit 14 works alone; Curve L193 18A corresponds to 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 194 18B corresponds to 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 18C is 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 18D corresponds to 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. As shown in FIG19A and FIG19B, compared with the curve L without the high-frequency acoustic unit 14, 191 , a curve L is provided for the high frequency acoustic unit 14 193 , curve L 194 , curve L 195 With curve L 196 The sensitivity at high frequencies (e.g., above 8kHz) is improved. That is, the configuration of the high-frequency acoustic unit 14 can effectively improve the acoustic output effect of the acoustic output device 10 in the high-frequency range. Compared to the curve L 193 , curve L 194 With curve L 195 , curve L 196 That is, among the four arrangement positions shown in FIG. 18A to FIG. 18D , the structure in which the high-frequency acoustic unit 14 is arranged on the inner side surface IS shown in FIG. 18D can better enhance the acoustic output effect of the acoustic output device 10 .

[0119] Some embodiments of the present 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 low-frequency acoustic unit, high-frequency acoustic unit, housing, and support structure of the acoustic output device are similar or identical to the low-frequency acoustic unit 13, high-frequency acoustic unit 14, housing 11, and support structure 12 of the acoustic output device 10. This acoustic output device differs from the acoustic output device 10 in that, in addition to the at least two sound guide holes provided on the housing 11, which may include a first sound guide hole and a second sound guide hole corresponding to the low-frequency acoustic unit and a third sound guide hole corresponding to the high-frequency acoustic unit, another sound guide hole (e.g., a fourth sound guide hole) corresponding to the high-frequency acoustic unit may also be provided. The third sound guide hole and the fourth sound guide hole are respectively provided on either side of the diaphragm of the high-frequency acoustic unit. The high-frequency acoustic unit can radiate sound through the third sound guide hole and the fourth sound guide hole, respectively. The third sound guide hole and the fourth sound guide hole also form a dipole, thereby enhancing the far-field sound leakage reduction of the acoustic output device and improving the output effect of the acoustic output device. For more details about the acoustic output device, please refer to the related description of the acoustic output device 10 , which will not be repeated here.

[0120] The basic concepts have been described above. It will be apparent to those skilled in the art that the detailed disclosure above is merely illustrative and does not limit the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and amendments to the present application. Such modifications, improvements, and amendments are suggested in the present application and remain within the spirit and scope of the exemplary embodiments of the present application.

[0121] At the same time, this application uses specific terms to describe the embodiments of this application. For example, "one embodiment," "an embodiment," and / or "some embodiments" refer to a certain feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that "one embodiment," "an embodiment," or "an alternative embodiment" mentioned twice or multiple times in different locations in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application may be appropriately combined.

[0122] Similarly, it should be noted that, in order to simplify the presentation of this application and thus facilitate understanding of one or more embodiments of the invention, the foregoing descriptions of the embodiments of this application sometimes combine multiple features into a single embodiment, figure, or description thereof. However, this disclosure method does not mean that the subject matter of this application requires more features than those recited in the claims. In fact, an embodiment may have fewer features than all of the features of a single embodiment disclosed above.

[0123] In some embodiments, numbers are used to describe the quantity of components and attributes. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise stated, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the description and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the settings of such numerical values ​​are as accurate as possible within the feasible range.

[0124] 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 variations may also fall within the scope of this application. Therefore, by way of example and not limitation, alternative configurations of the embodiments of this application may be considered consistent with the teachings of this application. Accordingly, the embodiments of this application are not limited to the embodiments explicitly introduced and described in this application.

Claims

1. An acoustic output device, comprising: Low-frequency acoustic unit; High-frequency acoustic unit; A housing configured to carry at least the low-frequency acoustic unit and the high-frequency acoustic unit; And A support structure configured to wear the housing near the ear canal but not block the ear canal opening; Wherein, at least two sound guiding holes are provided on the housing, a first sound guiding hole and a second sound guiding hole among the at least two sound guiding holes are respectively acoustically coupled to both sides of the diaphragm of the low-frequency acoustic unit, and the low-frequency acoustic unit radiates sound to the outside of the housing through the first sound guiding hole and the second sound guiding hole; One of the at least two sound guiding holes is acoustically coupled to one side of the diaphragm of the high-frequency acoustic unit, and the high-frequency acoustic unit radiates sound to the outside of the housing through the one sound guiding hole. In the wearing state, the sound guiding 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 one sound guiding hole is a third sound guiding hole; The low-frequency acoustic unit radiates sound to the outside of the housing through the first sound guiding hole and the second sound guiding hole; The high-frequency acoustic unit radiates sound to the outside of the housing through the third sound guiding hole; The first sound guiding hole, the second sound guiding hole and the third sound guiding hole are respectively arranged at different positions on the housing.

3. The acoustic output device according to claim 2, wherein, The third sound guiding hole is closer to the user's ear canal than the first sound guiding hole and the second sound guiding hole.

4. The acoustic output device according to claim 2, wherein, The housing includes an inner side surface opposite to the front outer side surface of the user's ear during wearing, and both the first sound guiding hole and the third sound guiding hole are located on the inner side surface.

5. The acoustic output device according to claim 1, wherein, The housing includes an inner side surface opposite to the front outer side surface of the user's ear during wearing. The one sound guiding hole is the first sound guiding hole. The first sound guiding 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 guiding hole is located on the inner side surface, and the low-frequency acoustic unit and the high-frequency acoustic unit radiate sound to the user's ear canal through the first sound guiding hole.

6. The acoustic output device according to claim 4 or 5, wherein, The overlapping ratio of the projected area of the high-frequency acoustic unit on the inner side surface of the housing and the projected area of the first sound guiding hole of the low-frequency acoustic unit on the inner side surface on the inner side surface does not exceed 10%.

7. The acoustic output device according to claim 4 or 5, wherein, The centroid of the projection of the high-frequency acoustic unit on the inner side surface of the housing is closer to the connection between the support structure and the housing than the centroid of the projection of the first sound guiding hole of the low-frequency acoustic unit on the inner side surface.

8. The acoustic output device according to claim 7, wherein, In the wearing state, one end of the housing away from the connection extends into the user's concha.

9. The acoustic output device according to claim 8, wherein, 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 on the inner side surface is closer to the upper side surface of the housing than the centroid of the projection of the first sound guiding hole of the low-frequency acoustic unit on the inner side surface.

10. The acoustic output device according to claim 4 or 5, wherein, The high-frequency acoustic unit is located on the lower side surface of the housing, or at the connection between the lower side surface and the inner side surface of the housing.

11. The acoustic output device according to claim 10, wherein, In the wearing state, the housing at least partially covers the user's antihelix area.

12. The acoustic output device according to claim 11, wherein, The included 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°.

13. The acoustic output device according to claim 4 or 5, wherein, The inner side surface of the housing includes a projection area and a non-projection area of the high-frequency acoustic unit. In the thickness direction of the housing, the projection area protrudes from the non-projection area.

14. The acoustic output device according to claim 13, wherein, In the thickness direction of the housing, the height difference between the projection area and the non-projection area is not less than 0.6 mm.

15. The acoustic output device according to claim 14, wherein, In the thickness direction of the housing, the ratio of the height difference between the projection area and the non-projection area to the thickness of the housing is greater than 0.

05.

16. The acoustic output device according to claim 4 or 5, wherein,The inner side surface of the housing includes a projection area and a non-projection area of the high-frequency acoustic unit, and the projection area and the non-projection area are flush.

17. The acoustic output device according to claim 4 or 5, wherein, The inner side surface of the housing includes a projection area and a non-projection area of the high-frequency acoustic unit, and 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.

18. The acoustic output device according to claim 1, wherein, The minimum resonance frequency corresponding to the high-frequency acoustic unit is not less than 5 kHz, and the minimum resonance frequency corresponding to the low-frequency unit is not higher than 1 kHz.

19. An acoustic output device, comprising: Low-frequency acoustic unit; High-frequency acoustic unit; A housing configured to carry at least the low-frequency acoustic unit and the high-frequency acoustic unit; And A support structure configured to wear the housing near the ear canal but not block the ear canal opening; Wherein, at least two sound guiding holes are provided on the housing, and the low-frequency acoustic unit and the high-frequency acoustic unit respectively radiate sound to the outside of the housing through one or more of the at least two sound guiding holes; The housing includes an inner side surface that is opposite to the front outer side surface of the user's ear during wearing. One of the at least two sound guiding holes is located on the inner side surface and is acoustically connected to the low-frequency acoustic unit. In the wearing state, the sound guiding hole corresponding to the high-frequency acoustic unit faces the user's ear canal; The overlapping ratio of the projected area of the high-frequency acoustic unit on the inner side surface of the housing to the projected area of the sound guiding hole of the low-frequency acoustic unit on the inner side surface on the inner side surface does not exceed 10%.

20. The acoustic output device according to claim 19, wherein, One of the at least two sound guiding holes is acoustically coupled to the diaphragm side of the high-frequency acoustic unit, and the high-frequency acoustic unit radiates sound to the outside of the housing through the one sound guiding hole.

21. The acoustic output device according to claim 19 or 20, wherein, The at least two sound guiding holes include a first sound guiding hole, a second sound guiding hole, and a third sound guiding hole; The low-frequency acoustic unit radiates sound to the outside of the housing through the first sound guiding hole and the second sound guiding hole; The high-frequency acoustic unit radiates sound to the outside of the housing through the third sound guiding hole; The first sound guiding hole, the second sound guiding hole, and the third sound guiding hole are respectively provided at different positions of the housing.

22. The acoustic output device according to claim 21, wherein, The third sound guiding hole is closer to the user's ear canal than the first sound guiding hole and the second sound guiding hole.

23. The acoustic output device according to claim 21, wherein, Both the first sound guiding hole and the third sound guiding hole are located on the inner side surface.

24. The acoustic output device according to claim 19, wherein, The sound guiding holes include a first sound guiding hole and a second sound guiding hole. The first sound guiding hole is acoustically coupled to the diaphragm side of the low-frequency acoustic unit and the diaphragm side of the high-frequency acoustic unit. The first sound guiding hole is located on the inner side surface, and the low-frequency acoustic unit and the high-frequency acoustic unit radiate sound to the user's ear canal through the first sound guiding hole.

25. The acoustic output device according to claim 21 or 24, wherein, The centroid of the projection of the high-frequency acoustic unit on the inner side surface 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 on the sound guide hole of the inner side surface.

26. The acoustic output device according to claim 25, wherein, In the worn state, one end of the housing away from the connection extends into the concha of the user's ear.

27. The acoustic output device according to claim 26, wherein, 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 on the inner side surface is closer to the upper side surface of the housing than the centroid of the projection of the low-frequency acoustic unit on the sound guide hole of the inner side surface.

28. The acoustic output device according to claim 21 or 24, wherein, The high-frequency acoustic unit is located on the lower side surface of the housing or at the connection between the lower side surface and the inner side surface of the housing.

29. The acoustic output device according to claim 28, wherein, In the worn state, the housing at least partially covers the antihelix region of the user.

30. The acoustic output device according to claim 29, wherein, The included 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°.

31. The acoustic output device according to claim 21 or 24, wherein, The inner side surface of the housing includes a projection area and a non-projection area of the high-frequency acoustic unit. In the thickness direction of the housing, the projection area protrudes from the non-projection area.

32. The acoustic output device according to claim 31, wherein, In the thickness direction of the housing, the height difference between the projection area and the non-projection area is not less than 0.6 mm.

33. The acoustic output device according to claim 31, wherein, In the thickness direction of the housing, the ratio of the height difference between the projection area and the non-projection area to the thickness of the housing is greater than 0.

05.

34. The acoustic output device according to claim 21 or 24, wherein, The inner side surface of the housing includes a projection area and a non-projection area of the high-frequency acoustic unit, and the projection area and the non-projection area are flush.

35. The acoustic output device according to claim 21 or 24, wherein, The inner side surface of the housing includes a projection area and a non-projection area of the high-frequency acoustic unit, and 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.

36. The acoustic output device according to claim 19, wherein, The minimum resonance frequency corresponding to the high-frequency acoustic unit is not lower than 5 kHz, and the minimum resonance frequency corresponding to the low-frequency unit is not higher than 1 kHz.

Images