Audio output device

Abstract

The acoustic output device includes a housing and a support structure, and the support structure is used to mount the housing near the user's ear canal, in a position that does not obstruct the ear canal opening. A low-frequency acoustic unit and a high-frequency acoustic unit are installed inside the housing, and at least two sound guide holes are provided in the housing. Of the at least two sound guide holes, the first and second sound guide holes are acoustically coupled to both sides of the diaphragm of the low-frequency acoustic unit, and one of the at least two sound guide holes is acoustically coupled to one side of the diaphragm of the high-frequency acoustic unit. When worn, the sound guide hole corresponding to the high-frequency acoustic unit faces the user's ear canal. By installing the high-frequency acoustic unit and directing its sound guide hole toward the user's ear canal, the volume of high-frequency sounds in the user's ear canal can be increased, compensating for the problem of insufficient output in the mid-to-high frequency band of the acoustic output device, thereby enabling the acoustic output device to have a good acoustic output effect across the entire frequency band.

Description

[Technical Field]

[0001] This specification relates to the field of acoustics, and more particularly to acoustic output devices. [Background technology]

[0002] With the development of acoustic output technology, acoustic devices (e.g., earphones) are widely applied in people's daily lives and can be used in combination with electronic devices such as mobile phones and computers to provide users with an auditory feast. Depending on the user's wearing method, acoustic devices can generally be classified into head-mounted, over-ear, and in-ear types. Conventional in-ear or head-mounted earphones cover or block the user's ear canal, affecting the user's experience in several scenarios. For example, in scenarios such as running, cycling, and swimming, users have difficulty hearing external sounds and experience discomfort even when worn for extended periods. The frequency response curve of current open-type earphones shows a large attenuation in the mid-to-high frequency range (e.g., frequency range above 8kHz), resulting in muffled mid-to-high frequency sounds and poor output performance.

[0003] Therefore, it is necessary to provide an audio output device with good output performance. [Overview of the Initiative] [Means for solving the problem]

[0004] The acoustic output device according to an embodiment of the present specification includes a low-frequency acoustic unit, a high-frequency acoustic unit, a housing configured to mount at least the low-frequency acoustic unit and the high-frequency acoustic unit, and a support structure configured to mount the housing at a position near the ear canal that does not block the ear canal opening. At least two sound guide holes are provided in the housing. The first sound guide hole and the second sound guide hole among the at least two sound guide holes are acoustically coupled to both sides of the diaphragm of the low-frequency acoustic unit, respectively. The low-frequency acoustic unit radiates sound to the outside of the housing through the first sound guide hole and the second sound guide hole. One of the at least two sound guide holes is acoustically coupled to one side of the diaphragm of the high-frequency acoustic unit. The high-frequency acoustic unit radiates sound to the outside of the housing through the one sound guide hole. In the wearing state, the sound guide hole corresponding to the high-frequency acoustic unit faces the user's ear canal.

[0005] Additional features are partly described in the following description and will be apparent to those skilled in the art by referring to the following content and drawings, or can be understood by the generation or operation of the examples. The features of the present specification can be realized and achieved by implementing or using various aspects of the methods, tools and combinations described in the following detailed examples.

[0006] The present specification will be further described by exemplary embodiments, and these exemplary embodiments will be described in detail with reference to the drawings. These embodiments are not limiting, and in these embodiments, the same reference numerals represent the same structures.

Brief Description of the Drawings

[0007] [Figure 1] It is a schematic diagram of an exemplary auricle according to some embodiments of the present application. [Figure 2] It is an exemplary block diagram of an acoustic output device according to some embodiments of the present specification. [Figure 3] It is an exemplary wearing schematic diagram of an acoustic output device according to some embodiments of the present specification. [Figure 4] This is a schematic diagram of the interior of a housing according to some embodiments of this specification. [Figure 5A] This is a schematic diagram of the frequency response curves for different cases of an acoustic output device according to some embodiments of this specification. [Figure 5B] This is an enlarged schematic diagram of the mid-to-high frequency curve shown in Figure 5A. [Figure 6] This is a schematic diagram of the external contour of a housing according to some embodiments of this specification. [Figure 7A] This is a schematic diagram showing the positions of the first and third sound conduits according to some embodiments of this specification. [Figure 7B] This is a schematic diagram showing the positions of the first and third sound conduits according to some embodiments of this specification. [Figure 7C] This is a schematic diagram showing the positions of the first and third sound conduits according to some embodiments of this specification. [Figure 8] This is a schematic diagram showing how the housing of an acoustic output device according to some embodiments of this specification is fitted when inserted into the concha. [Figure 9] This is a schematic diagram of an acoustic model formed by an acoustic output device according to some embodiments of this specification. [Figure 10] This is a schematic diagram of the frequency response curves of an acoustic output device corresponding to different installation positions of a high-frequency acoustic unit according to some embodiments of this specification. [Figure 11] This is an illustrative schematic diagram of an acoustic output device according to some other embodiments of this specification. [Figure 12] This is a schematic diagram of an acoustic model formed by an acoustic output device according to some further embodiments of this specification. [Figure 13] This is a schematic diagram showing the position of an acoustic output device and ear portion according to some embodiments of this specification. [Figure 14] This is a schematic diagram of the distribution of high-frequency sound waves when a high-frequency acoustic unit according to some embodiments of this specification is installed protruding from the housing. [Figure 15]This is a schematic diagram of the distribution of high-frequency sound waves when a high-frequency acoustic unit according to some embodiments of this specification is embedded in a housing. [Figure 16] This is a schematic diagram of the directivity of a high-frequency acoustic unit when the high-frequency acoustic unit and the housing are located in different positions, according to some embodiments of this specification. [Figure 17] This is a schematic diagram of the frequency response curve of a high-frequency acoustic unit when the high-frequency acoustic unit and the housing are located in different positions, according to some embodiments of this specification. [Figure 18A] This is a schematic diagram of a housing corresponding to cases where a high-frequency acoustic unit according to some embodiments of this specification is installed in a different location. [Figure 18B] This is a schematic diagram of a housing corresponding to cases where a high-frequency acoustic unit according to some embodiments of this specification is installed in a different location. [Figure 18C] This is a schematic diagram of a housing corresponding to cases where a high-frequency acoustic unit according to some embodiments of this specification is installed in a different location. [Figure 18D] This is a schematic diagram of a housing corresponding to cases where a high-frequency acoustic unit according to some embodiments of this specification is installed in a different location. [Figure 19A] This is a schematic diagram of the frequency response curves of an acoustic output device corresponding to cases where a high-frequency acoustic unit according to some embodiments of this specification is installed at different locations. [Figure 19B] This is a magnified schematic diagram of the mid-to-high frequency curve in Figure 19A. [Modes for carrying out the invention]

[0008] To more clearly illustrate the technical means of the embodiments described herein, the drawings necessary for describing the embodiments are briefly described below. Clearly, the drawings described below are merely some examples or embodiments of this specification, and those skilled in the art can apply this specification to other similar scenarios based on these drawings without requiring any creative effort. These exemplary embodiments are merely to enable those skilled in the art to better understand and implement this specification and are not intended to limit the scope of this specification in any way. Unless otherwise stated or otherwise evident from the context, the same numbers in the figures represent the same structure or operation.

[0009] As shown in this specification and the claims, unless the context explicitly indicates otherwise, terms such as “one,” “one,” “one kind,” and / or “the” do not specifically refer to the singular form, but may include the plural form. Generally, the terms “includes” and “contains” merely indicate that the specified steps and elements are included, and these steps and elements are not an exclusive list; the method or apparatus may also include other steps or elements. The term “based on” means “based on at least in part.” The term “one embodiment” refers to “at least one embodiment.” The term “another embodiment” refers to “at least one other embodiment.”

[0010] As understood in this specification, orientations or positional relationships indicated by terms such as “front,” “rear,” “ear hook,” and “rear hook” are based on the orientations or positional relationships shown in the drawings and are merely for the purpose of facilitating and simplifying this specification. They do not indicate or suggest that the devices or elements mentioned have a specific orientation or must be configured and operated in a specific orientation, and should not be understood as limiting this specification.

[0011] Furthermore, the terms “first” and “second” are used solely for descriptive purposes and should not be understood as indicating or suggesting relative importance or implicitly representing the number of technical features described. Therefore, features limited by “first” and “second” can be explicitly or implicitly indicated to include at least one such feature. In this description, unless otherwise clearly and specifically limited, “plural” means at least two, such as two, three, etc.

[0012] In this specification, unless otherwise explicitly provided and limited, terms such as “attachment,” “connection,” “connection,” and “fixing” should be understood in a broad sense, for example, a fixed connection, a removable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, or an internal communication or interaction relationship between two elements. Those skilled in the art will be able to understand the specific meaning of the above terms in this specification depending on the specific situation.

[0013] Embodiments of this specification provide an acoustic output device comprising a housing and a support structure, wherein the support structure allows the housing to be mounted near the user's ear canal in a position that does not obstruct 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 experience. A low-frequency acoustic unit and a high-frequency acoustic unit are installed within the housing, and at least two sound holes are provided in the housing, two of the at least two sound holes (e.g., a first sound hole and a second sound hole) are 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 two sound holes, and one of the at least two sound 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 one sound hole, and when worn, the sound hole corresponding to the high-frequency acoustic unit faces the user's ear canal. By installing a high-frequency acoustic unit and directing its sound guide hole towards the user's ear canal, the volume of high-frequency sounds (e.g., above 8kHz) in the user's ear canal can be increased, compensating for the lack of output in the mid-to-high frequency range (e.g., above 8kHz) of the acoustic output device, thereby enabling the acoustic output device to have good acoustic output performance across the entire frequency range.

[0014] Figure 1 is a schematic diagram of an exemplary auricle according to some embodiments of the present application. As shown in Figure 1, the auricle 100 may include the ear canal 101, the conchaecular cavity 102, the conchaecular scaphoid 103, the triangular fossa 104, the antihelix 105, the scaphoid fossa 106, the helix 107, the earlobe 108, and the crus of the helix 109. For convenience of explanation, in the embodiments of this specification, the superior crus of the antihelix 1011, the inferior crus of the antihelix 1012, and the antihelix 105 are collectively referred to as the antihelix region. In some embodiments, one or more parts of the auricle 100 can be used to attach and stabilize an acoustic device. In some embodiments, parts such as the ear canal 101, the conchaecular cavity 102, the conchaecular scaphoid 103, and the triangular fossa 104 have a certain depth and volume in three-dimensional space and can meet the needs for attaching an acoustic device. For example, an acoustic device (e.g., an in-ear earphone) may be attached to the ear canal 101. In some embodiments, the acoustic device can be attached to parts of the auricle 100 other than the ear canal 101. For example, the acoustic device can be attached to parts such as the conchae scaphoid 103, triangular fossa 104, antihelix 105, scaphoid fossa 106, helix 107, or a combination thereof. In some embodiments, to improve comfort and reliability when the acoustic device is attached, it may also be attached to parts such as the user's earlobe 108. By attaching the acoustic device and transmitting sound through parts of the auricle 100 other than the ear canal 101, the user's ear canal 101 can be "freed," and the impact of the acoustic device on the user's ear health can be reduced. When a user is wearing the acoustic device on the road, the acoustic device does not block the user's ear canal 101, allowing the user to hear sounds from the acoustic device as well as sounds from the environment (e.g., car horns, bicycle bells, voices of people around, traffic controllers, etc.), thereby reducing the probability of traffic accidents. For example, if the user is wearing an acoustic device, the entire or partial structure of the acoustic device may be located in front of the crus 109 of the helix (for example, the area M3 enclosed by the dotted line in Figure 1). Alternatively, if the user is wearing an acoustic device, the entire or partial structure of the acoustic device may 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 109 of the helix, the conchaeoflavone 103, the triangular fossa 104, the antihelix 105, the scaphoid fossa 106, and the helix 107).Furthermore, for example, if a user is wearing an acoustic device, the entire or partial structure of the acoustic device may be located within one or more parts of the auricle (e.g., the conchaecular cavity 102, the conchaecular scaphoides 103, the triangular fossa 104, etc.) (for example, the region M1 enclosed by the dotted line in Figure 1, which includes at least the conchaecular scaphoides 103 and the triangular fossa 104, and the region M2 which includes at least the conchaecular cavity 102).

[0015] There may be individual differences among users, and there may be differences in the shape, size, and other dimensions of the auricle 100. For the sake of ease of explanation and understanding, unless otherwise specified, this specification will further describe the mounting methods of the acoustic device on the auricle model in different embodiments, primarily using an auricle model having a "standard" shape and dimensions as a reference. For example, a simulator including a head and its (left, right) auricles 100, manufactured in accordance with ANSI:S3.36, S3.25 and IEC:60318-7 standards, such as GRAS45BCKEMAR, can be used as a reference for mounting the acoustic device and will show a scenario in which most users can successfully mount the acoustic device. In this application, descriptions such as "mounted by the user," "in a mounted state," and "in a mounted state" may refer to the acoustic device described in this application being mounted on the auricle 100 of the simulator. Naturally, considering that there are individual differences among different users, the structure, shape, size, thickness, etc. of one or more parts of the auricle 100 can be differentiated according to auricles 100 having different shapes and dimensions. These differentiated designs may be adapted to different auricles 100 by having characteristic parameters of one or more parts of the acoustic device (e.g., the housing, support structure, etc. below) have different ranges of values. Note that "non-wearing state" is not limited to the state in which the earphone is not worn on the user's auricle 100, but also includes the state in which the earphone is not deformed by external force, and "wearing state" is not limited to the state in which the earphone is worn on the user's auricle 100, but can also be considered a wearing state in which the support structure and housing are unfolded until the state of each part is the same as when worn (e.g., a certain distance is maintained between each structure).

[0016] In fields such as medicine and anatomy, the human body can be defined by three basic planes of cross-section: 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 cross-section perpendicular to the ground and running along the anterior-posterior direction of the body, dividing the body into two parts: left and right. The coronal plane is a cross-section perpendicular to the ground and running along the lateral direction of the body, dividing the body into two parts: front and back. The horizontal plane is a cross-section parallel to the ground and running along the vertical direction of the body, dividing the body into two parts: upper and lower. Accordingly, the sagittal axis is the axis perpendicular to the coronal plane and running along the anterior-posterior direction of the body, the coronal axis is the axis perpendicular to the sagittal plane and running along the lateral direction of the body, and the vertical axis is the axis perpendicular to the horizontal plane and running along the vertical direction of the body. Furthermore, the "anterior side of the auricle" as described in this application is a concept in contrast to the "posterior side of the auricle," with the former referring to the side of the auricle opposite the head and the latter referring to the side of the auricle facing the head, both of which refer to the user's auricle. When the auricle of the simulator is viewed along the direction of the coronal axis of the human body, a schematic diagram of the anterior contour of the auricle shown in Figure 1 is obtained.

[0017] The above description of the auricle 100 is for illustrative purposes only and is not intended to limit the scope of this application. Those skilled in the art can make various changes and modifications based on the description of this application. For example, a part of the structure of the acoustic device may cover part or all of the ear canal 101. These changes and modifications remain within the scope of protection of this application.

[0018] Figure 2 is an exemplary block diagram of an acoustic output device according to some embodiments of this specification, and Figure 3 is an exemplary schematic diagram of an acoustic output device according to some embodiments of this specification.

[0019] In some embodiments, the sound output device 10 may include glasses, smart bracelets, earphones, hearing aids, smart helmets, smartwatches, smart clothing, smart backpacks, smart accessories, or any combination thereof. For example, the sound output device 10 may be functional myopia glasses, reading glasses, cycling glasses, or sunglasses, or smart glasses such as audio glasses with earphone functionality, or a head-mounted device such as a helmet, an augmented reality (AR) device, or a virtual reality (VR) 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, 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.

[0020] As shown in Figures 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 both the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 are installed in the housing 11. The low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 work together to produce the acoustic output of the acoustic output device 10.

[0021] The housing 11 is connected to the support structure 12 and houses the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14. In some embodiments, the housing 11 may be a hollow, sealed housing structure, and the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 are located inside the housing 11. In some embodiments, the acoustic output device 10 may be combined with products such as glasses, headphones, head-mounted displays, or AR / VR helmets, in which case the housing 11 may be fixed near the user's auricle 100 by suspension or clamping. In some alternative embodiments, a suspension structure (e.g., a hook) may be installed on the housing 11. For example, by matching the shape of the hook to the shape of the auricle, the acoustic output device 10 may be independently attached to the user's auricle 100 by the hook.

[0022] In some embodiments, the housing 11 may have a housing structure that conforms to the regular or irregular shape of the human ear 100, such as annular, elliptical, racetrack, (regular or irregular) polygon, U-shape, V-shape, or semicircular, so that it can be directly attached to the user's auricle 100. In some embodiments, the housing 11 may further include a fixing structure. The fixing structure may include ear hooks, elastic belts, etc., so that the acoustic output device 10 can be better attached to the user and so that it does not fall off during use.

[0023] In some embodiments, the housing 11 may have a longitudinal axis X, a minor axis Y, and a thickness direction Z that are orthogonal to each other. The longitudinal axis X may be defined as the direction in which the extended dimension is greater in the shape of the two-dimensional projection plane of the housing 11 (for example, the projection onto the plane on which the inner surface (the surface adjacent to the auricle 100) of the housing 11 is located, or the projection onto the sagittal plane) (for example, if the projection shape is rectangular or substantially rectangular, the longitudinal axis is the length direction of the rectangle or substantially rectangular). For convenience of explanation, this specification describes the projection of the housing onto the sagittal plane. The minor axis Y may be defined as the direction perpendicular to the longitudinal axis X in the projection shape of the housing 11 onto the sagittal plane (for example, if the projection shape is rectangular or substantially rectangular, the minor axis is the width direction of the rectangle or substantially rectangular). The thickness direction Z may be defined as the direction perpendicular to the sagittal plane, for example, coinciding with the coronal axis, and both point in the left-right direction of the body.

[0024] As shown in Figures 1, 2, and 3, in some embodiments, when a user is wearing the acoustic output device 10, at least a portion of the housing 11 may be located in the anterior tragus region M3 or the anterolateral surface regions M1 and M2 of the auricle in the user's ear 100 as shown in Figure 1. Note that the anterolateral surface of the auricle referred to in the embodiments herein is the side opposite to the head along the coronal axis of the auricle, and correspondingly, the posterior medial surface of the auricle is the side facing the human head along the coronal axis of the auricle. In some embodiments, the housing 11 may be provided with at least two sound ducts for transmitting sound. In some embodiments, two of the at least two sound ducts are acoustically coupled to both sides of the diaphragm of the low-frequency acoustic unit 13, and the low-frequency acoustic unit 13 radiates sound to the outside of the housing 11 through the two sound ducts. At least one of the two sound ducts is acoustically coupled to one side of the diaphragm of the high-frequency acoustic unit 14, and the high-frequency acoustic unit 14 radiates sound to the outside of the housing 11 through the aforementioned sound duct, and when worn, the sound duct corresponding to the high-frequency acoustic unit 14 faces the user's ear canal.

[0025] In some embodiments, when worn, the housing 11 may be positioned toward the face region of the human body along the sagittal axis direction of the user's ear, i.e., at the position of the solid line frame A in Figure 3. In this case, the housing 11 is located in the face region M3 of the human body in front of the user's ear, and the major axis of the housing 11 may be vertical or nearly vertical, the projection of the minor axis direction Y onto the sagittal plane coincides with the direction of the sagittal axis, the projection of the major axis direction X onto the sagittal plane coincides with the direction of the vertical axis, and the thickness direction Z is perpendicular to the sagittal plane. In some embodiments, when worn, the housing 11 is inclined (for example, at the position shown by the dotted line frame B in Figure 3), the major axis direction X and the minor axis direction Y are still parallel or nearly parallel to the sagittal plane, the major axis direction X may have a constant angle with the direction of the sagittal axis, i.e., the major axis direction X may also be set at a corresponding inclination, the minor axis direction Y may have a constant angle with the direction of the vertical axis, i.e., the minor axis direction Y may also be set at a tilt, and the thickness direction Z is perpendicular to the sagittal plane. In this configuration, the acoustic output device 10 is located in the region where M2 is situated, and the concha 102 has a certain volume and depth. As a result, there is a certain distance between the inner surface of the acoustic output device 10 and the concha 10, and the ear canal communicates with the outside through a leakage structure between the inner surface and the concha 10, thus freeing both of the user's ears. Simultaneously, the housing 11 of the acoustic output device 10 can engage with the concha 10 to form an auxiliary cavity communicating with the ear canal. In some embodiments, at least one sound port may be at least partially located within the auxiliary cavity. The sound emanating from the sound port is restricted by the auxiliary cavity, meaning the auxiliary cavity collects sound and transmits more sound into the ear canal, thereby improving the volume and quality of the sound heard by the user in the near field and enhancing the acoustic effect of the acoustic output device 10. In some embodiments, when worn, the housing 11 may be in a horizontal or nearly horizontal position, as shown in the dotted frame C in Figure 3, in which case at least a portion of the housing 11 is located on the antihelix 105, the long axis X of the housing 11 may coincide with or nearly coincide with the sagittal axis and both point in the anterior-posterior direction of the body, the short axis Y may coincide with or nearly coincide with the vertical axis and both point in the posterior-interior direction of the body, and the thickness direction Z is perpendicular to the sagittal plane.In this way, the housing 11 avoids obstructing the ear canal, freeing both of the user's ears, and also increases the contact area between the housing 11 and the auricle 100, thereby improving the wearing comfort of the earphone 10. Note that when worn, the housing 11 shown at the position of the dotted line frame C may be approximately horizontal if the angle between the long axis X and the sagittal axis of the housing 11 shown at the position of the dotted line frame C in Figure 3 is within a specific range (for example, 20° or less). Furthermore, the wearing position of the housing 11 is not limited to positions A, B, C, etc., shown in Figure 3, but may be any position that satisfies region M3, region M1, or region M2 shown in Figure 1. For example, the entire or partial structure of the housing 11 may be located in region M3 enclosed by the dotted line in Figure 1. Furthermore, for example, the entire or partial structure of the housing 11 may be in contact with the upper part of the ear canal 101 (e.g., the location of one or more parts such as the crus of the helix 109, the conchaeoflavone 103, the triangular fossa 104, the antihelix 105, the scaphoid fossa 106, and the helix 107). Also, for example, the entire or partial structure of the housing 11 may be located within a cavity formed by one or more parts of the auricle 100 (e.g., the conchaeoflavone cavity 102, the conchaeoflavone 103, the triangular fossa 104, etc.) (e.g., region M1 including at least the conchaeoflavone 103 and the triangular fossa 104 and region M2 including at least the conchaeoflavone cavity 102, enclosed by the dotted line in Figure 1).

[0026] In some embodiments, the support structure 12 is configured to attach the housing 11 near the user's ear canal, in a position that does not block the ear canal opening, so that the user's auricle 100 remains open, and the user can hear not only the sound output from the acoustic output device 10 but also the sounds of the external environment. For example, the acoustic output device 10 may be mounted around or partially around the user's auricle 100 and can transmit sound by air conduction or bone conduction. In some embodiments, the support structure 12 may also differ depending on the type of acoustic output device 10. For example, if the acoustic output device 10 is an earphone, the support structure 12 may be an ear hook; if the acoustic output device 10 is glasses, the support structure 12 may be a temple; if the acoustic output device 10 is a bracelet, the support structure 12 may be a band; and if the acoustic output device 10 is a head-mounted device, the support structure 12 may be a helmet or the like.

[0027] In some embodiments, taking the acoustic output device 10 as an open-type earphone, the corresponding support structure 12 may be an ear hook, which may include a first part 121 and a second part 122, the first part 121 and the second part 122 being connected in order. When worn, the first part 121 of the support structure 12 is placed between the user's auricle and head, and the second part 122 extends on the side of the auricle away from the head and is connected to the housing 11, so that the housing 11 is worn near the ear canal but in a position that does not block the ear canal.

[0028] In some embodiments, to improve the stability of the acoustic output device 10 when worn, the acoustic output device 10 may be provided in any one or a combination thereof from the following methods. In Method 1, at least a portion of the support structure 12 is installed as a conforming structure attached to the rear side of the auricle 100 and at least one of the head, thereby increasing the contact area between the support structure 12 and the auricle 100 and / or head, and thereby increasing the resistance of the acoustic output device 10 to detach from the auricle 100. In Method 2, at least a portion of the support structure 12 is installed as an elastic structure that has a constant amount of deformation when worn, thereby increasing the positive pressure on the auricle 100 and / or head by the support structure 12, and thereby increasing the resistance of the acoustic output device 10 to detach from the auricle 100. In method 3, at least a portion of the support structure 12 is positioned to contact the head in the worn state so as to form a reaction force that presses against the auricle 100, and the housing 11 presses against the anterior lateral surface of the auricle 100 (for example, regions M1 and M2 shown in Figure 1), thereby increasing the resistance of the acoustic output device 10 to detach from the auricle 100. In method 4, the housing 11 and support structure 12 are positioned in the worn state so as to sandwich the region where the antihelix 105 is located, the region where the concha cavity is located, etc., from both sides of the anterior lateral and posteromedial surfaces of the auricle 100, thereby increasing the resistance of the acoustic output device 10 to detach from the auricle 100. In method 5, at least a portion of the housing 11 or the auxiliary structure connected thereto is positioned to be inserted into cavities such as the concha cavity 102, conchascaphoid 103, triangular fossa 104, and scaphoid fossa 106, thereby increasing the resistance of the acoustic output device 10 to detach from the auricle 100.

[0029] In some embodiments, the support structure 12 may have an arc-shaped structure that conforms to the boundary between the user's head and the auricle 100 so that it can be placed between the user's auricle 100 and the head. Exemplarily, the first part 121 of the support structure 12 connects the second part 122 and the housing 11 such that it is curved in three-dimensional space when the acoustic output device 10 is not worn (i.e., in its natural state). In other words, in three-dimensional space, the second part 122, the first part 121 and the housing 11 are not flush. With this setup, when the acoustic output device 10 is worn, the second part 122 may be placed between the rear of the user's auricle 100 and the head, and the housing 11 may contact the front of the user's auricle 100 (e.g., region M3 in Figure 1) or the auricle 100 (e.g., regions M1 and M2 in Figure 1), and the housing 11 and the second part 122 may engage to clamp the auricle 100. Specifically, the first portion 121 may extend from the head outward and engage with the second portion 122 to provide the housing 11 with pressure on the anterior side of the auricle 100 or on the area where the auricle 100 is located, so as not to obstruct the ear canal opening 101 of the auricle 100 when the acoustic output device 10 is attached.

[0030] In some embodiments, the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 can convert a signal containing voice information into an audio signal. In some embodiments, the audio signal may include bone conduction sound waves or air conduction sound waves. For example, the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 can generate mechanical vibrations and output sound waves (i.e., audio signals) in response to receiving a signal containing voice information. In some embodiments, the low-frequency acoustic unit 13 is 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, and the high-frequency acoustic unit 14 is an acoustic transducer having good acoustic output performance in a high-frequency range to improve the high-frequency output performance of the acoustic output device 10. The low-frequency range may be a frequency range smaller than 8 kHz, and the high-frequency range may be a frequency range larger than 8 kHz. In some embodiments, the low-frequency range and the high-frequency range may have different criteria depending on the actual situation. For example, the low-frequency range may be a frequency range of 1 kHz or less, such as 1 Hz to 1 kHz or 100 Hz to 800 Hz, while the high-frequency range may be a frequency range of 5 kHz or more, such as 5 kHz to 10 kHz or 8 kHz to 16 kHz.

[0031] In some embodiments, depending on the operating principle, the types of low-frequency acoustic units 13 and high-frequency acoustic units 14 may include, but are not limited to, moving-coil transducers, balanced armature transducers, flat transducers, piezoelectric transducers, etc. Moving-coil transducers have high energy conversion efficiency, high sensitivity, and good overall sound quality, but low output performance in the high-frequency range. Balanced armature transducers have high sensitivity, but the flat range of the frequency response curve is small, the structure is precise and expensive, and the structure is elongated and difficult to design. Piezoelectric transducers have high energy conversion efficiency and high sensitivity, but the piezoelectric element needs to be driven at a high voltage, the frequency response curve is not flat at high frequencies, and there are large peaks and valleys in the vibration modes. The diaphragm of a flat transducer receives a uniform force at each point, effectively avoiding the occurrence of partial vibrations, thereby effectively avoiding distortion of the output sound and providing high output performance in the high-frequency range.

[0032] Based on the above analysis, in some embodiments, the low-frequency acoustic unit 13 can use a movable coil transducer to have good acoustic output in the low-frequency range. In some embodiments, the high-frequency acoustic unit 14 can use a flat transducer to have good acoustic output in the high-frequency range.

[0033] In some embodiments, the minimum resonant frequency corresponding to the high-frequency acoustic unit 14 is 5 kHz or higher, and the minimum resonant frequency corresponding to the low-frequency acoustic unit 13 is 1 kHz or lower. With the above setup, the low-frequency acoustic unit 13 can have a large output in the mid-to-low frequency range (e.g., 1 kHz to 8 kHz), and the high-frequency acoustic unit 14 can have a large output in the high frequency range (e.g., a frequency range of 8 kHz or higher), thereby the acoustic output device 10 has a good acoustic output effect across the entire frequency band (e.g., a frequency range of 1 kHz or higher).

[0034] In some embodiments, in order 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 4 kHz or more, and the ratio 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 5 or more. In some embodiments, in order to further ensure that the acoustic output device 10 has a high acoustic output effect over a medium-low frequency range, the minimum resonant frequency corresponding to the low-frequency acoustic unit 13 may be small, 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 6 kHz or more, and the ratio 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 10 or more. In some embodiments, in order to further enhance the high acoustic output effect of the acoustic output device 10 within the high frequency range, the minimum resonant frequency corresponding to the high-frequency acoustic unit 14 may be large, the difference between the minimum resonant frequency of the high-frequency acoustic unit 14 and the minimum resonant frequency of the low-frequency acoustic unit 13 may be 8 kHz or more, and the ratio 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 20 or more.

[0035] Figure 4 is a schematic diagram of the interior of a housing according to some embodiments of this specification, Figure 5A is a schematic diagram of the frequency response curves in different cases of an acoustic output device according to some embodiments of this specification, and Figure 5B is an enlarged schematic diagram of the mid-to-high frequency curve of Figure 5A. As shown in Figures 5A and 5B, curve L 52 The curve L represents the frequency response curve of the acoustic output device 10 when only the low-frequency acoustic unit 13 is operating. 53 The curve L represents the frequency response curve of the acoustic output device 10 when only the high-frequency acoustic unit 14 is operating. 54This 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 are operating simultaneously. In some embodiments, as shown in Figure 4, the low-frequency acoustic unit 13 may be installed inside the housing 11, and the high-frequency acoustic unit 14 may be installed inside the housing 11 and protrude from the surface of the housing 11. The low-frequency acoustic unit 13 is a movable-coil transducer, and the high-frequency acoustic unit 14 is a flat transducer, and the resonant frequency of the high-frequency acoustic unit 14 may be 8 kHz. The input signal voltages of both the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 are 0.5 V and have the same phase. In some embodiments, the frequency response curves in Figures 5A and 5B can be measured by a microphone, and the microphone may be positioned 4 mm away from the corresponding sound guide hole that is close to the user's ear canal when worn, and the direction is from the corresponding sound guide hole toward the user's ear when worn. When the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 are operating simultaneously, the position of the corresponding sound port may be midway between the sound port corresponding to the low-frequency acoustic unit 13 that is closest to the user's ear canal when worn and the sound port corresponding to the high-frequency acoustic unit 14 (for example, the midpoint of the connecting line between the centers of the two). If the sound port corresponding to the high-frequency acoustic unit 14 completely overlaps with one of the two sound ports corresponding to the low-frequency acoustic unit 13, the microphone is positioned at the center of the larger of the two overlapping sound ports.

[0036] As shown in Figures 5A and 5B, within the low frequency range (e.g., below 800 Hz), curve L 52 and curve L 54 This is in close agreement, indicating that the sound output device 10 outputs mainly low-frequency (e.g., 800 Hz or less) sound from the low-frequency sound unit 13, and the effect of the installation of the high-frequency sound unit 14 on the low-frequency output of the low-frequency sound unit 13 is negligible. Curve L 52 This indicates that a sharp attenuation begins at 7kHz, showing that the output performance of the low-frequency acoustic unit 13 is poor in the high-frequency range (e.g., above 8kHz). Curve L53 shows that the output is low at low frequencies, the output stabilizes and improves after 1.2 kHz, is maintained at a high level after 7 kHz, has little attenuation, and the high-frequency audio unit 14 has good output performance at high frequencies (for example, 8 kHz or higher). Curve L 54 is curve L 52 and curve L 53 can be regarded as a curve obtained by overlapping and fitting curves L 53 is curve L 52 provides compensation for the attenuation section (for example, 7 kHz or higher) in curve L 54 basically overlaps curve L 52 before 7 kHz, curve L 54 basically overlaps curve L 53 after 7 kHz. By adding the high-frequency audio unit 14 into the audio output device 10, the low-frequency output effect of the audio output device 10 can be guaranteed, and the output sound pressure level at high frequencies (for example, 8 kHz or higher) can be stably improved, indicating that the audio output device 10 has a good output effect in the full frequency band. Also, as can be seen by comparing curve L 54 and curve L 52 , within the frequency range of 8 kHz or higher, curve L 54 is 10 dB to 15 dB higher than curve L 52 , indicating that the installation of the high-frequency audio unit 14 can improve the output sound pressure level of the audio output device 10 at high frequencies (for example, 8 kHz or higher) by 10 dB to 15 dB, and the high-frequency improvement effect is very significant.

[0037] In some embodiments, the housing 11 is provided with at least two sound ducts, and two of these at least two sound ducts (e.g., a first sound duct 111 and a second sound duct 112) are acoustically coupled to both sides of the diaphragm of the low-frequency acoustic unit 13, and the low-frequency acoustic unit 13 radiates sound to the outside of the housing 11 through the two sound ducts (e.g., a first sound duct 111 and a second sound duct 112). When the low-frequency acoustic unit 13 outputs sound waves, the sound waves from one side of the diaphragm of the low-frequency acoustic unit 13 (or referred to as the first sound wave) may be radiated through one of the two sound ducts, and the sound waves from the other side of the diaphragm of the low-frequency acoustic unit 13 (or referred to as the second sound wave) may be radiated through the other of the two sound ducts. In some embodiments, the two sound ducts can emit two sets of sound waves with a phase difference (e.g., opposite phase) to form a dipole, which interferes and cancels out at a spatial point (e.g., the far field of the sound output device 10), thereby effectively improving the far-field sound leakage problem in the mid-to-low frequency range (e.g., 100Hz to 800Hz) of the sound output device 10.

[0038] In some embodiments, at least one of the two sound ducts may be acoustically coupled to one side of the diaphragm of the high-frequency acoustic unit 14, and the high-frequency acoustic unit 14 radiates sound to the outside of the housing 11 through the one sound duct, and when worn, the sound duct corresponding to the high-frequency acoustic unit 14 faces the user's ear canal. The high-frequency acoustic unit 14 outputs sound waves (or referred to as third sound waves) to the outside of the housing 11 through only one sound duct, forming a monopole. In some embodiments, in the mid-to-high frequency range (e.g., 800Hz to 10kHz), the monopole design improves the directivity of the high-frequency acoustic unit 14, and combined with the placement where the corresponding sound duct faces the user's ear canal, it improves the listening effect on the user's ear from the third sound waves output from the high-frequency acoustic unit 14, allowing the user to receive a loud volume at the opening of the ear canal and obtain a clear listening effect. By installing the high-frequency acoustic unit 14 and its corresponding sound guide hole, the output sound pressure level of the acoustic output device 10 at high frequencies (e.g., 8kHz to 16kHz) can be improved, and the output effect of the acoustic output device 10 across the entire frequency band can be guaranteed.

[0039] In some embodiments, the sound conduit corresponding to the high-frequency acoustic unit 14 may be a third sound conduit (e.g., third sound conduit 113) that is different from the two sound conduits corresponding to the low-frequency acoustic unit 13 (e.g., first sound conduit 111, second sound conduit 112). That is, by ensuring that the third sound conduit (e.g., third sound conduit 113) does not overlap with the two sound conduits (e.g., first sound conduit 111, second sound conduit 112), the design position of the third sound conduit (e.g., third sound conduit 113) becomes more flexible, improving the flexibility of mounting the high-frequency acoustic unit 14, and allowing the third sound conduit corresponding to the high-frequency unit 14 to be closer to the user's ear canal when worn, thereby guaranteeing the high-frequency output effect. In some embodiments, the sound port corresponding to the high-frequency acoustic unit 14 may be one of the two sound ports corresponding to the low-frequency acoustic unit 13 (e.g., a first sound port 111 and a second sound port 112). That is, the sound port corresponding to the high-frequency acoustic unit 14 may partially or completely overlap with one of the two sound ports corresponding to the low-frequency acoustic unit 13 (e.g., a first sound port 111 and a second sound port 112), simplifying the structural design and ensuring consistency in the output of the high-frequency acoustic unit 14 and the low-frequency acoustic unit 13. In some embodiments, if the sound hole corresponding to the high-frequency acoustic unit 14 is a third sound hole (e.g., third sound hole 113) that is different from the two sound holes corresponding to the low-frequency acoustic unit 13 (e.g., first sound hole 111, second sound hole 112), the third sound hole may not overlap with one of the two sound holes corresponding to the low-frequency acoustic unit 13 (e.g., the first sound hole 111 or the second sound hole 112) (i.e., there may be no overlap) or may only partially overlap. If the third sound hole completely overlaps with one of the two sound holes corresponding to the low-frequency acoustic unit 13 (e.g., the first sound hole 111 or the second sound hole 112), the third sound hole and the sound hole that completely overlaps it can be considered as a single sound hole.

[0040] It should be understood that the block diagram shown in Figure 2 is for illustrative purposes only and is not intended to limit the scope of this application. Those skilled in the art can make various modifications and alterations under the guidance of this application. All such modifications and alterations fall within the scope of protection of the application. In some embodiments, the number of parts shown in the figure may be adjusted according to the actual situation. In some embodiments, one or more elements shown in Figure 2 may be omitted, and one or more other elements may be added or removed. For example, the acoustic output device 10 may not include the support structure 12, and the housing 11 may have a mounting and fixing function for the support structure 12. In some embodiments, one component may be replaced by another component that can achieve a similar function. In some embodiments, one component may be divided into multiple sub-components, and multiple components may be integrated into a single component. For example, the housing 11 and the support structure 12 may be integrated into a single component.

[0041] Figure 6 is a schematic diagram of the external contour of a housing according to some embodiments of this specification, and Figures 7A to 7C are schematic diagrams of the positions of the first and third sound conduits according to some embodiments of this specification. As shown in Figures 4 and 6, in some embodiments, at least two sound conduits in the housing 11 may include a first sound conduit 111, a second sound conduit 112, and a third sound conduit 113. The first sound conduit 111 and the second sound conduit 112 are acoustically coupled to both sides of the diaphragm of the low-frequency acoustic unit 13, respectively. In some embodiments, the first sound conduit 111 may be located on the side of the housing 11 facing the auricle, and the diaphragm of the low-frequency acoustic unit 13 may divide the housing 11 into a front cavity and a rear cavity, and the first sound conduit 111 communicates with the front cavity, allowing the user to hear sound by leading the sound generated in the front cavity out of the housing 11 and transmitting it to the user's ear canal. In some embodiments, the sound emitted through the first sound port 111 can be partially transmitted to the ear canal so that the user can hear the sound, and the other part can be transmitted to the outside of the acoustic output device 10 and the ear through the gap between the housing 11 and the ear (e.g., the part of the concha not covered by the housing 11), along with the sound reflected in the ear canal, thereby forming a first sound leakage in the far field. At the same time, a second sound port 112 is located on another side of the housing 11 (e.g., the side away from the user's ear canal or the side opposite to the user's ear canal). It may be installed such that the second sound conduit 112 is further from the ear canal than the first sound conduit 111, and the sound transmitted from the second sound conduit 112 generally forms a second sound leakage in the far field, the intensity of the first sound leakage and the intensity of the second sound leakage are about the same, and the phases of the first sound leakage and the phases of the second sound leakage are (substantially) out of phase with each other, thereby allowing them to cancel each other out of phase in the far field, which helps to achieve a sound leakage reduction effect at low frequencies of the acoustic output device 10, and the acoustic output device 10 exhibits dipole directivity at low frequencies (e.g., 100Hz to 800Hz).In some embodiments, the third sound port 113 is acoustically coupled to one side of the diaphragm of the high-frequency acoustic unit 14, the third sound port 113 is positioned toward the user's ear canal, the high-frequency acoustic unit 14 outputs the third sound wave only through the third sound port 113, and the third sound port 113 is the sound source of the third sound wave. The wavelength of the high-frequency sound wave generated by the high-frequency acoustic unit 14 is short and corresponds to the dimensions of the third sound port 113 from which the high-frequency acoustic unit 14 outputs the third sound wave, so the sound source of the third sound wave should not be considered a point source but a surface source. The sound field received at a certain position in the far field of the acoustic output device 10 can be considered as an overlap of countless point sources on the radiating surface where the surface source is located, and because there is a difference in the acoustic distance between each point source and the receiving position, the third sound wave received at the receiving position is related to frequency and wavelength. The higher the frequency of the third sound wave, the sharper and better the sound field directivity of the high-frequency acoustic unit 14. Because the frequency of the third sound wave output by the high-frequency acoustic unit 14 through the third sound guide hole 113 is high, its directivity is also good, improving the listening effect on the user's ears to the third sound wave output from the high-frequency acoustic unit 14 and guaranteeing the output effect of the acoustic output device 10 across the entire frequency band.

[0042] In some embodiments, the first sound hole 111, the second sound hole 112, and the third sound hole 113 are located at different positions on the housing 11. In some embodiments, in order to increase the listening volume at the user's ear canal, the first sound hole 111 and the third sound hole 113 may be located closer to the user's ear canal on the housing 11, for example, on the side wall of the housing 11 facing the user's ear canal. The second sound hole 112 may be located further away from the user's ear canal on the housing 11, for example, on the side wall of the housing 11 opposite to the user's ear canal, thereby avoiding the second sound wave being emitted and clashing with the first sound wave emitted from the first sound hole 111 near the user's ear canal, thereby affecting the listening effect. In some embodiments, as shown in Figures 7A to 7C, the first sound guide hole 111 and the third sound guide hole 113 may be installed on the same side wall of the housing 11, so that both the first sound guide hole 111 and the third sound guide hole 113 are positioned toward the user's ear canal, thereby increasing the listening volume at the user's ear canal. In some embodiments, as shown in Figure 7A, on the side wall where the first sound guide hole 111 is installed, the third sound guide hole 113 may be installed at any position other than the first sound guide hole 111, reducing the design difficulty of positioning the third sound guide hole 113 toward the user's ear canal and making the installation position of the high-frequency acoustic unit 14 more flexible.

[0043] In some embodiments, the second sound guide hole 112 and the first sound guide hole 111 are located on either side of the diaphragm of the low-frequency acoustic unit 13, with the second sound guide hole 112 positioned relatively opposite to the user's ear canal. For example, the first side wall of the housing 11 may face the user's ear canal and the first sound guide hole 111 may be located on the first side wall of the housing 11, or the second sound guide hole 112 may be located on a third side wall opposite to the user's ear canal, facing the position of the first side wall, or the second sound guide hole 112 may be located on a second side wall opposite to the user's ear canal, adjacent to the position of the first side wall, thereby, when the acoustic output device 10 is worn, the first sound guide hole 111 faces the user's ear canal and the second sound guide hole 112 is away from the user's ear canal. The sound emitted from the first sound conduit 111 and the sound emitted from the second sound conduit 112 that meets specific conditions (for example, a phase difference of approximately 180°) can form a dipole-like emission, and in the far field, the sound emitted from the first sound conduit 111 and the sound emitted from the second sound conduit 112 can cancel each other out of phase, thereby reducing the volume of sound leakage from the low-frequency acoustic unit 13 in the far field and preventing the low-frequency sound emitted from the acoustic output device 10 from being heard by people nearby.

[0044] When a user is wearing a sound generating device, the ratio of the distance between the second sound conduit 112 and the user's ear canal to the distance between the first sound conduit 111 and the user's ear canal can be made as large as possible in order to ensure the listening volume at the user's ear canal and the effect of reducing sound leakage at a distance from the low-frequency acoustic unit 13. In some embodiments, the ratio of the distance between the second sound conduit 112 and the user's ear canal to the distance between the first sound conduit 111 and the user's ear canal may be greater than 1.2. In some embodiments, in order to further ensure the listening volume at the user's ear canal and the effect of reducing sound leakage at a distance from the low-frequency acoustic unit 13, the range of the ratio of the distance between the second sound conduit 112 and the user's ear canal to the distance between the first sound conduit 111 and the user's ear canal may be 1.2 to 8. In some embodiments, in order to further ensure the listening volume at the user's ear canal and the effect of reducing sound leakage at a distance from the low-frequency acoustic unit 13, the range of the ratio of the distance between the second sound conduit 112 and the user's ear canal to the distance between the first sound conduit 111 and the user's ear canal may be 1.4 to 5. In some embodiments, in order to further ensure the listening volume at the user's ear canal and the effect of reducing sound leakage at a distance from the low-frequency acoustic unit 13, the range of the ratio of the distance between the second sound conduit 112 and the user's ear canal to the distance between the first sound conduit 111 and the user's ear canal may be 1.5 to 2.5.

[0045] In some embodiments, the distance between the first sound port 111 and the user's ear canal should be as small as possible to ensure that a loud volume is heard when the user is wearing the sound output device 10. The distance between the first sound port 111 and the user's ear canal is the distance between the center of the first sound port 111 and the centroid of the contour of the user's ear canal. The distance between the first sound port 111 and the user's ear canal may also be the distance between the center of the first sound port 111 and the center of the user's ear canal, or it may be the distance between the center of the first sound port 111 and the plane on which the user's ear canal is located. In some embodiments, the distance between the first sound port 111 and the user's ear canal may be less than 4 cm. In some embodiments, to further ensure the user's listening volume, the distance between the first sound port 111 and the user's ear canal may be less than 3 cm. In some embodiments, in order to ensure the opening of the ear canal, the first sound port 111 needs to maintain a certain distance from the ear canal, and the distance between the first sound port 111 and the user's ear canal may be in the range of 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 port 111 and the user's ear canal may be in the range of 1 cm to 3.1 cm.

[0046] When a user is wearing the sound output device 10, if the distance between the second sound port 112 and the user's ear canal is too small, the sound output from the second sound port 112 near the user's ear canal will cancel out the sound output from the first sound port 111. To ensure the listening volume at the user's ear canal and reduce sound leakage at a distance, in some embodiments, the distance between the second sound port 112 and the user's ear canal may be greater than 1 cm. Also, if the distance between the first sound port 111 and the second sound port 112 is too large, or if the distance between the second sound port 112 and the ear canal is too large, the volume of the sound generating 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 port 112 and the user's ear canal 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 conduit 112 and the user's ear canal may be in the range of 1.5 cm to 7 cm. In some embodiments, to further ensure the listening volume at the user's ear canal and the effect of reducing sound leakage at a distance from the low-frequency acoustic unit 13, the distance between the second sound conduit 112 and the user's ear canal may be in the range of 2.5 cm to 4 cm.

[0047] In some embodiments, to avoid the second sound wave emitted from the second sound port 112 and the first sound wave emitted from the first sound port 111 canceling each other out in the near field and affecting the user's listening quality, the distance between the second sound port 112 and the first sound port 111 should not be too close. The distance between the second sound port 112 and the first sound port 111 may be the distance between the center of the second sound port 112 and the center of the first sound port 111. In some embodiments, the distance between the second sound port 112 and the first sound port 111 may be 4 mm to 15.11 mm. In some embodiments, to further ensure the user's listening quality, the distance between the second sound port 112 and the first sound port 111 may be 8 mm to 10 mm.

[0048] In some embodiments, the third sound port 113 is positioned closer to the user's ear canal than the first and second sound ports 111 and 112. Combined with the placement of the third sound port 113 towards the user's ear canal, this allows for a greater amount of high-frequency sound to be received at the user's ear canal opening, ensuring a sufficiently high sound pressure level at the user's ear canal opening, thereby guaranteeing a high-frequency listening effect. In some embodiments, the distance between the third sound port 113 and the user's ear canal opening may be less than 2.5 cm. In some embodiments, to further guarantee the user's high-frequency listening effect, the distance between the third sound port 113 and the user's ear canal opening may be less than 1 cm. In some embodiments, to ensure an open ear canal opening, the third sound port 113 needs to maintain a certain distance from the ear canal opening, and the distance between the third sound port 113 and the user's ear canal opening may be in the range of 0.1 cm to 1.5 cm. In some embodiments, to further ensure the opening of the ear canal, the distance between the third sound channel 113 and the user's ear canal may be in the range of 0.5 cm to 2.5 cm.

[0049] As shown in Figures 1, 3, and 6, in some embodiments, the housing 11 may include a side wall facing the anterolateral surface of the user's auricle (also called the medial surface IS) and a side wall opposite to the anterolateral surface of the user's auricle (also called the lateral surface OS).

[0050] In some embodiments, when worn, the inner surface IS faces the auricle along the thickness direction Z, and the outer surface OS faces away from the auricle along the thickness direction Z. In some embodiments, the housing 11 may further include a connecting surface that connects the inner surface IS and the outer surface OS. When viewed along the thickness direction Z in the worn state, the housing 11 may be installed in a circular, elliptical, rounded square, rounded rectangle, or other shape. When the housing 11 is installed in a circular, elliptical, or other shape, the connecting surface may refer to the arc-shaped side of the housing 11. When the housing 11 is installed in a rounded square, rounded rectangle, or other shape, the connecting surface may include the lower surface LS, the upper surface US, and the rear surface RS. Therefore, for the sake of explanation, this embodiment will exemplify the case in which the housing 11 is installed in a rounded rectangle. The length of the housing 11 in the long axis direction X may be greater than the width of the housing 11 in the short axis direction Y. As shown in Figures 3 and 6, the housing 11 may, when worn, have an upper side surface US opposite to the ear canal 101 along the short axis Y, a lower side surface LS toward the ear canal 101, and a posterior side surface RS connecting the upper side surface US and the lower side surface LS, with the posterior side surface RS located at one end toward the back of the head along the long axis X when worn.

[0051] In some embodiments, the high-frequency acoustic unit 14 and the low-frequency acoustic unit 13 may be designed to be stacked in the thickness direction Z, so that the first sound conduit 111 and the third sound conduit 113 can both be located on the inner surface IS, and the first sound conduit 111 and the third sound conduit 113 can be positioned close to the user's ear canal, thereby increasing the listening volume at the user's ear canal opening. Designing the high-frequency acoustic unit 14 and the low-frequency acoustic unit 13 to be stacked in the thickness direction Z means that in the thickness direction Z, the high-frequency acoustic unit 14 is located above (e.g., directly above, laterally above, etc.) or below (e.g., directly below, laterally below, etc.) the low-frequency acoustic unit 13, that is, in the thickness direction Z, the high-frequency acoustic unit 14 is closer to the outer surface OS or inner surface IS than the low-frequency acoustic unit 13. In some embodiments, the second sound guide hole 112 may be installed on another side wall of the housing 11 away from the user's ear (e.g., the upper side US, the rear side RS, the outer side OS, etc.) so that there is an appropriate distance between the second sound guide hole 112 and the user's ear canal opening, thereby ensuring the listening volume at the user's ear canal opening and reducing the far-field sound leakage effect of the low-frequency acoustic unit 13.

[0052] As shown in Figure 7C, in some embodiments, the first sound conduit 111 may completely overlap with the third sound conduit 113. In this case, the first sound conduit 111 and the third sound conduit 113 may be considered as a single sound conduit, and the one with the larger area is the sound conduit. Taking the first sound conduit 111 as an example, the first sound conduit 111 is simultaneously acoustically coupled to one side of the diaphragm of the low-frequency acoustic unit 13 and one side of the diaphragm of the high-frequency acoustic unit 14, and both the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14 radiate sound into the user's ear canal through the first sound conduit 111.

[0053] As shown in Figure 7B, in some embodiments, the first sound hole 111 may partially overlap with the third sound hole 113. In this case, the first sound hole 111 and the third sound hole 113 may be considered as a single sound hole, which includes a first region (i.e., the portion that does not overlap with the first sound hole 111), a second region (i.e., the portion that does not overlap with the third sound hole 113), and a third region (i.e., the overlapping portion of the first sound hole 111 and the third sound hole 113). The first and third regions of the sound guide hole are simultaneously acoustically coupled to one side of the diaphragm of the low-frequency acoustic unit 13, and the low-frequency acoustic unit 13 radiates sound into the user's ear canal through the first and third regions of the sound guide hole. The second and third regions of the sound guide hole are simultaneously acoustically coupled to one side of the diaphragm of the high-frequency acoustic unit 14, and the high-frequency acoustic unit 14 radiates sound into the user's ear canal through the second and third regions of the sound guide hole.

[0054] As shown in Figure 7A, if the first sound guide hole 111 and the third sound guide hole 113 do not overlap, the third sound guide hole 113 may be installed at any position other than the first sound guide hole 111, reducing the design difficulty of having the third sound guide hole 113 face the user's ear canal and making the installation position of the high-frequency acoustic unit 14 more flexible. Furthermore, the high-frequency acoustic unit 14 may be installed protruding from the inner surface IS of the housing 11, or it may be fitted into the housing 11 corresponding to the inner surface IS, further improving the flexibility of mounting the high-frequency acoustic unit 14.

[0055] As shown in Figures 7B and 7C, if there is an overlap between the first sound guide hole 111 and the third sound guide hole 113, the first sound guide hole 111 and the third sound guide hole 113 must be on the same plane. In this case, the high-frequency acoustic unit 14 may be fitted into the housing 11 corresponding to the inner surface IS. The first sound guide hole 111 and the third sound guide hole 113 may be considered as the same sound guide hole, and the design of a single sound guide hole not only simplifies the structure but also reduces the difficulty of the manufacturing design. Furthermore, since the high-frequency acoustic unit 14 is fitted into the housing 11, the high-frequency acoustic unit 14 does not protrude from the surface of the housing 11, the surface of the housing 11 becomes flat, and the appearance becomes aesthetically pleasing.

[0056] In some mounting configurations, both the third sound guide hole 113 and the first sound guide hole 111 are located on the inner surface IS, and the high-frequency acoustic unit 14 is located on the housing 11 corresponding to the inner surface IS. As a result, the high-frequency acoustic unit 14 may shield the first sound guide hole 111, reducing the sound output by the low-frequency acoustic unit 13 through the first sound guide hole 111, which could affect the low-frequency listening volume in the user's ear canal. Therefore, the high-frequency acoustic unit 14 may be positioned to avoid the first sound guide hole 111 as much as possible.

[0057] In some embodiments, to avoid the high-frequency acoustic unit 14 shielding the first sound guide hole 111 and to ensure the user's low-frequency listening volume, the overlap ratio between the area of ​​the projection of the high-frequency acoustic unit 14 onto the inner surface IS of the housing 11 and the area of ​​the projection of the sound guide hole (i.e., the first sound guide hole 111) onto the inner surface IS of the housing 11 of the low-frequency acoustic unit 13 may be 10% or less, i.e., the ratio of the overlap area to the area of ​​the first sound guide hole 111 is 10% or less. In some embodiments, to further ensure the user's low-frequency listening volume in the ear canal, the overlap ratio between the area of ​​the projection of the high-frequency acoustic unit 14 onto the inner surface IS of the housing 11 and the area of ​​the projection of the sound guide hole (i.e., the first sound guide hole 111) onto the inner surface IS of the housing 11 of the low-frequency acoustic unit 13 may be 8% or less. In some embodiments, in order to further ensure the listening volume of low frequencies in the user's ear canal, the overlap ratio between the area of ​​the projection of the high-frequency acoustic unit 14 onto the inner surface IS of the housing 11 and the area of ​​the projection of the sound guide hole (i.e., the first sound guide hole 111) onto the inner surface IS of the housing 11 of the low-frequency acoustic unit 13 may be 5% or less.

[0058] In order to increase the amount of high-frequency sound received at the user's ear canal, ensure that the sound pressure level received at the user's ear canal is sufficiently high, and guarantee the high-frequency listening effect, in some embodiments, when worn, the third sound guide hole 113 is closer to the user's ear canal than the first sound guide hole 111 on the inner surface IS. The position of the third sound guide hole 113 corresponds to the installation position of the high-frequency acoustic unit 14 on the inner surface IS of the housing 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 surface IS may be represented by the centroid of the projection of the high-frequency acoustic unit 14 onto the inner surface IS, that is, the centroid of the projection of the high-frequency acoustic unit 14 onto the inner surface IS is closer to the user's ear canal than the sound guide hole (first sound guide hole 111) on the inner surface IS of the low-frequency acoustic unit 13.

[0059] Figure 8 is a schematic diagram showing how the housing of an acoustic output device according to some embodiments of this specification is fitted when inserted into the concha. As shown in Figure 8, in some embodiments, the housing 11 may have a connecting end CE connected to a support structure 12, and when the acoustic output device 10 is fitted, the first part 121 of the support structure 12 is placed between the user's auricle and head, and the second part 122 of the support structure 12 extends on the side of the auricle away from the head and is connected to the connecting end CE of the housing 11 to achieve clamping and fixing of the housing 11.

[0060] By inserting at least a portion of the housing 11 into the concha 102, the listening volume at the listening position (e.g., the ear canal), particularly the listening volume of mid-to-low frequencies, can be increased while still maintaining an excellent effect of canceling sound leakage in the far field. For illustrative purposes only, when the entire or partial structure of the housing 11 is inserted into the concha 102, the housing 11 and the concha 102 form a structure similar to a cavity (hereinafter abbreviated as a similar cavity), and in the embodiments of this specification, the similar cavity may be understood as a semi-sealed structure surrounded by the side of the housing 11 and the structure of the concha 102, the semi-sealed structure not completely sealing the interior and isolating it from the external environment, but having a leakage structure (e.g., openings, gaps, tubes, etc.) that acoustically communicates with the external environment. When a user is wearing the acoustic output device 10, one or more sound guides, for example, a first sound guide 111, may be provided on the side of the housing 11 that is close to or facing the user's ear canal (e.g., the inner surface IS), and one or more sound guides, for example, a second sound guide 112, may be provided on other sides of the housing 11 (e.g., the outer surface RS, which is away from or opposite to the user's ear canal), the first sound guide 111 being acoustically coupled to the front cavity of the acoustic output device 10, and the second sound guide 112 being acoustically coupled to the rear cavity of the acoustic output device 10. The sound output from the first sound port 111 and the sound output from the second sound port 112 can be considered as approximately two sound sources, with the phases of the sound waves from these two sound sources being opposite. The housing 11 and the inner wall corresponding to the concha 102 form a similar cavity structure, the sound source corresponding to the first sound port 111 is located within this similar cavity structure, and the sound source corresponding to the second sound port 112 is located outside this similar cavity structure, forming the acoustic model shown in Figure 9.

[0061] Figure 9 is a schematic diagram of an acoustic model formed by an acoustic output device according to some embodiments of this specification. As shown in Figure 9, the similar cavity structure 402 may include a listening position and at least one sound source 401A. Here, "includes" may indicate that at least one of the listening position and the sound source 401A is inside the similar cavity structure 402, or that at least one of the listening position and the sound source 401A is at the edge inside the similar cavity structure 402. The listening position may correspond to the entrance of the ear canal of the auricle, or it may be an acoustic reference point of the auricle, such as an ear reference point (ERP), an ear-drum reference point (DRP), or an entrance structure that leads to the listener. Because the sound source 401A is enclosed in the similar cavity structure 402, most of the radiated sound reaches the listening position by direct or reflected means. In contrast, without the similar cavity structure 402, most of the sound radiated from the sound source 401A does not reach the listening position. Therefore, by installing the cavity structure, the volume of sound that reaches the listening position is significantly increased. Also, only a small portion of the out-of-phase sound radiated from the out-of-phase sound source 401B outside the similar cavity structure 402 enters the similar cavity structure 402 through the leakage structure 403 of the similar cavity structure 402. This corresponds to the generation of a secondary sound source 401B' in the leakage structure 403, and the intensity of the secondary sound source 401B' is significantly lower than that of sound source 401B and significantly lower than that of sound source 401A. The sound generated by the secondary sound source 401B' has a weaker out-of-phase cancellation effect with respect to sound source 401A within the cavity, and as a result, the listening volume at the listening position is significantly increased. Regarding sound leakage, the fact that sound source 401A radiates sound to the outside from the cavity leakage structure 403 corresponds to the generation of a secondary sound source 401A' in the leakage structure 403. Almost all of the sound radiated from sound source 401A is output from the leakage structure 403, and since the scale of the similar cavity structure 402 is much smaller (at least an order of magnitude smaller) than the spatial scale used to evaluate sound leakage, the intensity of the secondary sound source 401A' is considered to be about the same as the intensity of sound source 401A.With respect to the external space, the secondary sound source 401A' and sound source 401B form a dual sound source that cancels each other out, reducing sound leakage.

[0062] In a specific application scenario, the outer wall surface of the housing 11 is usually flat or curved, and the contour of the user's concha 102 is uneven. By inserting part or all of the housing 11 into the concha 102, a similar cavity structure communicating with the outside is formed between the housing 11 and the contour of the concha 102. Furthermore, by placing the first sound guide hole 111 on the housing 11 facing the user's ear canal and in a position close to the edge of the concha 102 (e.g., on the inner surface IS), and placing the second sound guide hole 112 on the housing 11 opposite the ear canal or away from the ear canal, the acoustic model shown in Figure 9 can be constructed. This improves the listening position at the user's ear canal opening and reduces sound leakage effects in the far field when the user is wearing the acoustic output device 10.

[0063] As shown in Figure 8, when at least a portion of the housing 11 is inserted into the concha, the housing 11 is positioned at an angle when worn. Specifically, please refer to the relevant explanation of the dotted frame B in Figure 3, which will be omitted here. At this time, the connection end CE is closer to the user's ear canal, and the posterior side RS is further from the user's ear canal than the connection end CE and needs to contact the concha. Therefore, a portion of the inner side IS that is close to the posterior side RS may come into contact with the concha. In some embodiments, the centroid of the projection of the high-frequency acoustic unit 14 onto the inner side IS is closer to the connection end CE than the sound guide hole (first sound guide hole 111) on the inner side IS of the low-frequency acoustic unit 13. This causes the third sound guide hole 113 to be closer to the user's ear canal than the first sound guide hole 111, ensuring the directivity of the third sound guide hole 113 and thereby ensuring the high-frequency listening effect.

[0064] In some embodiments, when the housing 11 is not inserted into the concha, the housing 11 may be installed at an angle when worn, so that the corresponding connection end CE is closer to the user's ear canal and the posterior side RS is further away from the user's ear canal. In this case, the centroid of the projection of the high-frequency acoustic unit 14 onto the inner side IS is closer to the connection end CE than the sound guide hole (first sound guide hole 111) on the inner side IS of the low-frequency acoustic unit 13.

[0065] Figure 10 is a schematic diagram of the frequency response curves of an acoustic output device corresponding to different installation positions of a high-frequency acoustic unit according to some embodiments of this specification. As shown in Figure 10, curve L 101 This represents the frequency response curve of the acoustic output device 10 when the high-frequency acoustic unit 14 is installed close to the connection terminal CE of the housing 11, i.e., curve L 101 This is the frequency response curve of the acoustic output device 10 when the high-frequency acoustic unit 14 is closer to the connection end CE than the first sound guide hole 111 and closer to the user's ear canal, and curve L 102 This represents the frequency response curve of the acoustic output device 10 when the high-frequency acoustic unit 14 is installed in close proximity to the rear side RS of the housing 11, i.e., curve L 102 This is the frequency response curve of the acoustic output device 10 when the high-frequency acoustic unit 14 is closer to the rear side RS than the first sound guide hole 111, far from the connection end CE, and far from the user's ear canal. 101 and curve L 102 As can be seen by comparing them, in the frequency range of 8kHz to 10kHz, curve L 101 The whole thing is a curve L 102 Higher than curve L 101 The overall shape is flatter. That is, when the centroid of the projection of the high-frequency acoustic unit 14 onto the inner surface IS is closer to the connection end CE than the sound guide hole (first sound guide hole 111) on the inner surface IS of the low-frequency acoustic unit 13, the acoustic output device 10 has a higher output sound pressure level in the user's ear canal and higher sound quality.

[0066] As shown in Figures 6 and 8, in some embodiments, in the short axis direction Y of the housing 11, the centroid of the projection of the high-frequency acoustic unit 14 onto the inner surface IS is located above the sound guide hole (i.e., the first sound guide hole 111) on the inner surface IS of the low-frequency acoustic unit 13. That is, the centroid of the projection of the high-frequency acoustic unit 14 onto the inner surface IS is closer to the upper surface US than the centroid of the projection of the first sound guide hole 111 onto the inner surface IS. This prevents the high-frequency acoustic unit 14 from shielding 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 avoiding affecting the low-frequency listening volume in the user's ear canal. In some embodiments, the centroid of the projection of the high-frequency acoustic unit 14 onto the inner surface IS may be located directly above the first sound guide hole 111 in the short axis direction Y, or the centroid of the projection of the projection of the high-frequency acoustic unit 14 onto the inner surface IS may be located diagonally 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 projection of the high-frequency acoustic unit 14 onto the inner surface IS may be located diagonally above the first sound guide hole 111 and close to the rear surface RS in the short axis direction Y.

[0067] Furthermore, when worn, the free end of the housing 11 (i.e., the posterior side RS of the housing 11) may, in addition to being inserted into the concha, have its orthogonal projection positioned on the antihelix, or on both sides of the head and on the anterior side of the auricle along the sagittal axis of the human body. In other words, the support structure 12 can support the housing 11 to be worn in various positions such as the concha, antihelix, anterior side of the auricle, and posterior side of the auricle, allowing the acoustic output device 10 to be applied to various wearing methods. In some types of acoustic output devices 10 that are fitted in the concha or behind the auricle, the centroid of the projection of the high-frequency acoustic unit 14 onto the inner surface IS is closer to the connection point 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) on the inner surface IS of the low-frequency acoustic unit 13 onto the inner surface IS. As a result, the third sound guide hole 113 can be closer to the user's ear canal than the first sound guide hole 111, thereby ensuring a high-frequency listening effect.

[0068] In some different mounting methods, the installation position of the high-frequency acoustic unit 14 may be changed accordingly to bring the high-frequency acoustic unit 14 closer to the user's ear canal than the first sound conduit 111. The acoustic output device 10 shown in Figure 11 will be described in detail below as an example. On the premise that it does not contradict the corresponding acoustic principle, the structure of the acoustic output device 10 in Figure 11 and its corresponding parameters can also be similarly applied to the acoustic output device 10 in which the housing 11 can be inserted into the concha.

[0069] Figure 11 is an illustrative schematic diagram of an acoustic output device according to some other embodiments of this specification.

[0070] As shown in 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, which may include one or more of the antihelix 105, the upper crus of the antihelix, and the lower crus of the antihelix shown in Figure 1, in which case the housing 11 is located above the concha 102 and the ear canal opening, and the user's ear canal opening is open. In some embodiments, the housing 11 may include a first sound port 111 and a second sound port 112, the first sound port 111 being acoustically coupled to the front cavity of the acoustic output device 10, and the second sound port 112 being acoustically coupled to the rear cavity of the acoustic output device 10, and the sound output from the first sound port 111 and the sound output from the second sound port 112 can be considered as substantially two point sources, the phases of the sound from the two point sources being opposite, and forming a single dipole. When the user is wearing the sound output device 10, the first sound guide hole 111 is located on the side wall of the housing 11 facing or close to the user's ear canal opening, and the second sound guide hole 112 is located on the side wall of the housing 11 away from the user's ear canal opening or on the side wall opposite the user's ear canal opening. This arrangement allows the user's ear canal to be completely open, ensuring the listening effect of the sound output device 10, and also allows the user to hear external sounds more clearly, improving the open-type listening effect. When worn, the inner surface IS of the housing 11 abuts against the antihelix region, and the uneven structure of the antihelix region can act as a baffle, increasing the acoustic distance over which sound emitted from the second sound port 112 is transmitted to the ear canal. This increases the difference in acoustic distance to the ear canal between the first sound port 111 and the second sound port 112, reducing canceling interference between the first and second sound ports 111 and the second sound port 112 at the listening position, and increasing the sound intensity at the listening position in the near field.

[0071] As shown in Figure 11, by positioning at least a portion of the housing 11 on the user's antihelix 105, the output effect of the acoustic output device 10 can be improved, that is, it ensures a reduction in sound leakage in the far field and increases the sound intensity at the listening position in the near field. Sound emitted from the first sound conduit 111 is transmitted directly to the user's ear canal without obstruction, but sound emitted from the second sound conduit 112 needs to bypass the housing 11 or pass through the housing 11 to form an acoustic model similar to that shown in Figure 12.

[0072] Figure 12 is a schematic diagram of an acoustic model formed by an acoustic output device according to some further embodiments of this specification. As shown in Figure 12, when a baffle is installed between point source A1 and point source A2, in the near field, the sound field of point source A2 can interfere with the sound waves of point source A1 at the listening position only by bypassing the baffle, which corresponds to an increase in the acoustic distance from point source A2 to the listening position. Therefore, assuming that point sources A1 and A2 have the same amplitude, the amplitude difference of the sound waves of point sources A1 and A2 at the listening position is larger compared to when no baffle is installed, which reduces the degree to which the sounds from the two paths cancel each other out at the listening position, resulting in a higher volume at the listening position. In the far field, the sound waves generated by point sources A1 and A2 can interfere over a wide spatial range without bypassing the baffle (similar to the case without a baffle), so sound leakage in the far field does not increase significantly compared to when no baffle is installed. Therefore, by installing a baffle structure around one of the point sound sources A1 and A2, the volume at the listening position in the near field can be significantly increased, even if the sound leakage volume in the far field does not increase significantly.

[0073] As shown in Figure 11, the inner surface IS and lower surface LS of the housing 11 are close to the user's ear canal. In order to position the high-frequency acoustic unit 14 close to the user's ear canal, in some embodiments, the high-frequency acoustic unit 14 may be installed on the lower surface LS of the housing 11, or on the connection point between the lower surface LS and the inner surface IS of the housing 11. This allows the third sound guide hole 113 of the high-frequency acoustic unit 14 to face the user's ear canal more favorably, increasing the volume of high-frequency listening in the user's ear canal, compensating for the problem of insufficient output in the mid-to-high frequency band (e.g., frequency band greater than 8kHz) of the acoustic output device 10, thereby enabling the acoustic output device 10 to have a good acoustic output effect across the entire frequency band.

[0074] Figure 13 is a schematic diagram of the position of the acoustic output device and ear portion according to some embodiments of this specification. As shown in Figure 13, N1 in Figure 13 is the vibration direction of the diaphragm of the high-frequency acoustic unit 14, and N2 is 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 antihelix region of the user, and the first sound guide hole 111 is positioned toward the antihelix of the user. In this case, the first sound guide hole 111 and the second sound guide hole 112 form a dipole, and the antihelix region can act as a baffle, thereby increasing the listening volume in the user's ear canal and ensuring the user's listening effect.

[0075] The high-frequency acoustic unit 14 outputs sound only through the third sound conduit 113. As a monopole, the high-frequency acoustic unit 14 has a short wavelength of high-frequency sound waves. When the vibration direction N1 of the high-frequency acoustic unit 14 is directed toward the user's antihelix region, the sound output from the high-frequency acoustic unit 14 through the third sound conduit 113 is more likely to be 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 may be directed toward the user's ear canal, and the third sound conduit 113 is positioned toward the user's ear canal.

[0076] In some embodiments, for a dipole composed of a first sound port 111 and a second sound port 112, the first sound port 111 may be designed toward the user's ear canal, and the second sound port 112 may be designed toward the opposite side of the user's ear canal or toward the antihelix, in order to increase the acoustic distance difference between the first sound port 111 and the second sound port 112 to the user's ear canal opening, thereby increasing the listening volume of low frequencies at the user's ear canal opening. In some embodiments, the vibration direction N2 of the low-frequency acoustic unit 13 can be directed toward the user's antihelix region. In some embodiments, in order to have a large size and vibration space for the diaphragm of the low-frequency acoustic unit 13, the diaphragm of the low-frequency acoustic unit 13 may be parallel or nearly parallel to the inner surface IS or outer surface OS, in which case the vibration direction N2 of the low-frequency acoustic unit 13 may be perpendicular or nearly perpendicular to the inner surface IS or outer surface OS. In some embodiments, in order to ensure that the sound output device 10 has a good sound leakage reduction effect and that the sound output device 10 has a good sound output effect across the entire frequency band, the angle α between the vibration direction N1 of the high-frequency sound unit 14 and the vibration direction N2 of the low-frequency sound unit 13 may be in the range of 36° to 54°. In some embodiments, in order to further improve the sound output effect of the sound output device 10 across the entire frequency band and to increase the user's listening volume, the angle α between the vibration direction N1 of the high-frequency sound unit 14 and the vibration direction N2 of the low-frequency sound unit 13 may be in the range of 40° to 50°. In some embodiments, in order to further improve the sound output effect of the sound output device 10 across the entire frequency band and to increase the user's listening volume, the angle α between the vibration direction N1 of the high-frequency sound unit 14 and the vibration direction N2 of the low-frequency sound unit 13 may be 45°.

[0077] The high-frequency sound waves output from the high-frequency acoustic unit 14 have short wavelengths and are easily absorbed. The position of the high-frequency acoustic unit 14 relative to the housing 11 (e.g., embedded, flush, protruding, etc.) affects the loss of high-frequency sound waves reaching the user's ear canal, and further affects the output effect of the high-frequency sound waves from the high-frequency acoustic unit 14, which in turn affects the listening volume in the user's ear canal.

[0078] In some embodiments, the inner surface IS of the housing 11 includes a projected area and a non-projected area of ​​the high-frequency acoustic unit 14, and in the thickness direction Z of the housing 11, the projected area protrudes from the non-projected area. In some embodiments, the projected area is the area covered by the projection of the high-frequency acoustic unit 14 onto the inner surface IS along the thickness direction Z, and the non-projected area is the area on the inner surface IS that is not covered by the projection of the high-frequency acoustic unit 14. The projection of the projected area from the non-projected area means that, as shown in Figures 4, 6, and 14, the high-frequency acoustic unit 14 is installed so as to protrude at least partially from the inner surface IS in the thickness direction Z. By installing the high-frequency acoustic unit 14 so as to protrude from the inner surface IS, the high-frequency acoustic unit 14 is made more accessible to the user's ear canal, thereby increasing the user's listening volume.

[0079] Figure 14 is a schematic diagram of the distribution of high-frequency sound waves when a high-frequency acoustic unit according to some embodiments of this specification is installed protruding from the housing. As shown in Figure 14, the bottom of the high-frequency acoustic unit 14 is basically flush with the outer surface of the housing 11, that is, the high-frequency acoustic unit is installed protruding completely from the surface of the housing 11. With this installation, when a signal with a frequency of 15 kHz is input, the high-frequency sound waves output from the high-frequency acoustic unit 14 are almost spherical waves, the directivity of the high-frequency acoustic unit 14 is good, the sound pressure in the user's ear canal 101 (i.e., point C in Figure 14) is high, and the user's listening volume is high.

[0080] Figure 15 is a schematic diagram of the distribution of high-frequency sound waves when a high-frequency acoustic unit according to some embodiments of this specification is embedded in a housing. 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 housed inside the housing 11, and the protruding height is basically 0 mm. With this installation, when a signal with a frequency of 15 kHz is input, the high-frequency sound waves output from the high-frequency acoustic unit 14 are almost spherical waves, and the directivity of the high-frequency acoustic unit 14 is good. As can be seen by comparing Figure 14 and Figure 15, when the high-frequency acoustic unit 14 is embedded in the housing 11, the sound pressure in the user's ear canal 101 (i.e., point C in Figures 14 and 15) is relatively high, the high-frequency sound waves are relatively concentrated, and the user's listening volume is relatively high compared to when the high-frequency acoustic unit 14 is installed protruding from the housing 11. In other words, when the high-frequency acoustic unit 14 is embedded in the housing 11, the listening volume in the user's ear canal becomes relatively high, and the high-frequency output effect of the acoustic output device 10 becomes relatively good.

[0081] Figure 16 is a schematic diagram of the directivity of a high-frequency acoustic unit when the high-frequency acoustic unit and housing are located in different positions according to some embodiments of this specification, and Figure 17 is a schematic diagram of the frequency response curve of a high-frequency acoustic unit when the high-frequency acoustic unit and housing are located in different positions according to some embodiments of this specification. In the image in Figure 16, the frequency of the input signal to the corresponding high-frequency acoustic unit 14 is 15 kHz.

[0082] As shown in 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 is installed protruding from the housing 11. 162 This 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. As shown in Figure 16, curve L 161 It is relatively rounded, with a curved L shape. 162 It is relatively sharp, curve L 162The directivity is better. In the 90° direction, curve L 162 is curve L 161 It protrudes significantly in relation to the curve L, in the direction opposite at 90°. 161 is curve L 162 This is particularly pronounced. That is, even when the high-frequency acoustic unit 14 is installed protruding from the housing 11, good directivity can be achieved. However, when the high-frequency acoustic unit 14 is embedded in the housing 11, the sound pressure level in the far field is relatively low, and the sound pressure level in the near field is relatively high. As a result, the listening volume in the user's ear canal is relatively high, and sound leakage in the far field is reduced.

[0083] As can be seen from Figure 16, curve L 161 and curve L 162 The peaks are all located in the 90° direction. Curve L 161 and curve L 162 For each of these, the peak position is used as the reference point, and the curve L is reduced by 3 dB. 161 Obtain two points and curve L 162 Two points can be obtained, and the angular range between the two corresponding points on the curve is the -3dB beam width of the corresponding curve. In some embodiments, the curve L 161 The -3dB beamwidth is 141°, and the curve L 162 The -3dB beamwidth is 101°. Curve L 161 Compared to curve L 162 The -3dB beam width is smaller, and the curve L 162 Its directivity is better.

[0084] As shown in Figure 17, curve L 171 The curve L represents the frequency response curve of the high-frequency acoustic unit 14 when the high-frequency acoustic unit 14 is installed protruding from the housing 11. 172 This represents the frequency response curve of the high-frequency acoustic unit 14 when the high-frequency acoustic unit 14 is embedded in the housing 11. As shown in Figure 17, in the high frequency range (e.g., 8 kHz or higher), curve L 172 The position is curve L 171This is approximately 2 dB higher. In other words, within the high frequency range (e.g., 8 kHz or higher), the output sound pressure level is approximately 2 dB higher when the high frequency acoustic unit 14 is embedded in the housing 11 compared to when the high frequency acoustic unit 14 is installed protruding from the housing 11.

[0085] Based on the above, when the high-frequency acoustic unit 14 is embedded in 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 compared to when the high-frequency acoustic unit 14 is installed protruding from the housing 11. 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 loss to high-frequency sound waves is large, which has some effect on the transmission distance of high-frequency sound waves.

[0086] In some embodiments, the projection region and the non-projection region are made flush with each other (i.e., the height difference between the projection region and the non-projection region of the housing 11 in the thickness direction Z is set to 0 mm) in order to improve the high-frequency sound output performance of the sound output device 10 and to reduce the loss of high-frequency sound waves. Due to the possibility of manufacturing and mounting errors, the projection region and the non-projection region may not be absolutely flush with each other. In some embodiments, if the height difference between the projection region and the non-projection region of the housing 11 in the thickness direction Z is less than 0.6 mm, the projection region and the non-projection region are considered to be approximately flush with each other.

[0087] In some embodiments, in order to improve the high-frequency sound output performance of the sound output device 10 and increase the user's listening volume, the ratio of the height difference between the projected region and the non-projected region of the housing 11 to the thickness of the housing 11 in the thickness direction Z may be less than 0.6. In some embodiments, in order to further improve the high-frequency sound output performance of the sound output device 10, the ratio of the height difference between the projected region and the non-projected region of the housing 11 to the thickness of the housing 11 in the thickness direction Z may be 0 to 0.3. In some embodiments, in order to further increase the user's listening volume, the ratio of the height difference between the projected region and the non-projected region of the housing 11 to the thickness of the housing 11 in the thickness direction Z may be 0 to 0.1.

[0088] In Figures 14 to 17 above, the analysis of the output performance of the acoustic output device 10 when the high-frequency acoustic unit 14 protrudes from the housing 11 or is embedded in the housing 11 is based on a "standard" shape and size auricle model. In actual applications, since different users have different ear shapes (e.g., shape and size), the position of the acoustic output device 10 when worn will also differ, and the distance from the sound guide hole of the high-frequency acoustic unit 14 to the user's ear canal when worn will differ. In this case, the output performance of the acoustic output device 10 may also change depending on whether the corresponding high-frequency acoustic unit 14 protrudes from the housing 11 or is embedded in the housing 11. If the dimensions of the user's ear are large, and the distance between the sound guide hole corresponding to the high-frequency acoustic unit 14 and the user's ear canal is large when worn, the path loss of high-frequency sound waves will affect the high-frequency output effect of the acoustic output device 10. However, when the high-frequency acoustic unit 14 protrudes from the housing 11, the distance between the sound port corresponding to the high-frequency acoustic unit 14 and the user's ear canal is short, while when the high-frequency acoustic unit 14 is embedded in the housing 11, the distance between the sound port corresponding to the high-frequency acoustic unit 14 and the user's ear canal is long. Therefore, a design in which the high-frequency acoustic unit 14 is embedded in the housing 11 (for example, flush with the housing 11) is relatively suitable for users with small ears, but the user experience is relatively poor for users with large ears. By designing the high-frequency acoustic unit 14 to protrude from the housing 11, the distance between the sound port corresponding to the high-frequency acoustic unit 14 and the user's ear canal can be effectively reduced for users with large or small ears, thereby allowing users with different ear shapes to obtain a good listening effect.

[0089] In some embodiments, to ensure that the acoustic output device 10 can fit a wider range of user ear shapes, and that the sound guide hole corresponding to the high-frequency acoustic unit 14 has a relatively small gap from the user's ear canal when the acoustic output device 10 is worn, the high-frequency acoustic unit 14 can be designed to protrude from the housing 11 to ensure an effective acoustic output. In some embodiments, the degree of protrusion of the high-frequency acoustic unit 14 relative to the inner surface IS can be expressed by the difference in height between the projected area and the unprojected area in the thickness direction Z. In some embodiments, if the difference in height between the projected area and the unprojected area in the thickness direction Z is 0.6 mm or more, it can be determined that the high-frequency acoustic unit 14 protrudes from the housing 11. That is, if 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 0.6 mm or more, it can be determined that the high-frequency acoustic unit 14 protrudes from the housing 11. In some embodiments, the height difference between the projected area and the unprojected area in the thickness direction Z of the housing 11 is 4 mm or less, thereby avoiding the high-frequency acoustic unit 14 protruding too much from the housing 11, which would affect the mounting of the acoustic output device 10, and prevent interference between the sound guide hole (e.g., the first sound guide hole 111, etc.) and the user's ear structure, thus affecting the listening effect. That is, when the high-frequency acoustic unit 14 protrudes from the housing 11, the height difference between the projected area and the unprojected area in the thickness direction Z may be 0.6 mm to 4 mm. When the high-frequency acoustic unit 14 is designed to protrude from the housing 11, the greater the degree to which the projected area protrudes relative to the unprojected area, the closer the high-frequency acoustic unit 14 can get to the user's ear canal, thereby increasing the user's listening volume. In some embodiments, when the high-frequency acoustic unit 14 is designed to protrude from the housing 11, the height difference between the projected area and the unprojected area in the thickness direction Z of the housing 11 may be 1.5 mm to 3 mm in order to further increase the user's listening volume.In some embodiments, when the high-frequency acoustic unit 14 is designed to protrude from the housing 11, the height difference between the projection area and the non-projection area may be 2 mm to 2.5 mm in order to further ensure the mounting of the acoustic output device 10 and to ensure the listening effect.

[0090] In some embodiments, the degree of protrusion of the high-frequency acoustic unit 14 from the inner surface IS may be expressed 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, 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 is greater than 0.05 in order to ensure that the acoustic output device 10 has a good acoustic output effect at high frequencies and to guarantee the user's listening volume. In some embodiments, when the high-frequency acoustic unit 14 is designed to protrude from the housing 11, 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 may be 0.06 to 0.12 in order to further ensure the mounting of the acoustic output device 10 and to guarantee the listening effect. In some embodiments, when the high-frequency acoustic unit 14 is designed to protrude from the housing 11, the ratio of the height difference between the projected area and the non-projected area to the thickness dimension of the housing 11 may be 0.08 to 0.09 in order to further increase the user's listening volume.

[0091] In some embodiments, the high-frequency acoustic unit 14 may use a balanced armature transducer to improve the acoustic output performance of the acoustic output device 10.

[0092] Figures 18A to 18D are schematic diagrams of housings corresponding to cases where the high-frequency acoustic unit according to some embodiments of this specification is installed in different locations, Figure 19A is a schematic diagram of the frequency response curve of an acoustic output device corresponding to cases where the high-frequency acoustic unit according to some embodiments of this specification is installed in different locations, and Figure 19B is an enlarged schematic diagram of the mid-to-high frequency curve in Figure 19A.

[0093] In some embodiments, the high-frequency acoustic unit 14 may be installed at one end of the housing 11 in the short axis direction Y. In some embodiments, as shown in Figure 18A, the high-frequency acoustic unit 14 may be installed on the outside of the housing 11, for example, on the upper side US, the lower side LS, etc. In some embodiments, the high-frequency acoustic unit 14 may be installed inside the corresponding side wall of the housing 11 (for example, the upper side US, the lower side LS, etc.). The sound guide hole corresponding to the high-frequency acoustic unit 14 (for example, the third sound guide hole 113) may be installed directly toward the inner side IS.

[0094] In some embodiments, the high-frequency acoustic unit 14 may be installed at one end of the housing 11 in the longitudinal axis direction X. In some embodiments, the high-frequency acoustic unit 14 may be installed on the outside of the housing 11. In this case, since one end of the housing 11 in the longitudinal axis direction X becomes a connection end CE connected to the support structure 12, the high-frequency acoustic unit 14 may be installed on the rear side RS of the housing 11, as shown in Figure 18B. In some embodiments, the high-frequency acoustic unit 14 may be installed inside the corresponding side wall of the housing 11 (e.g., connection end CE, rear side RS, etc.). The sound guide hole corresponding to the high-frequency acoustic unit 14 (e.g., third sound guide hole 113) may be installed directly toward the inner side IS.

[0095] In some embodiments, the high-frequency acoustic unit 14 may be positioned below the low-frequency acoustic unit 13 in the thickness direction Z. That is, in the thickness direction Z, the high-frequency acoustic unit 14 is closer to the outer surface OS than the low-frequency acoustic unit 13. In some embodiments, since structures such as control buttons and touch areas may be installed on the outer surface OS of the housing 11, the high-frequency acoustic unit 14 may be installed inside the housing 11. As shown in Figure 18C, since the inner surface IS of the housing 11 is close to the user's ear canal and the low-frequency acoustic unit 13 is installed between the high-frequency acoustic unit 14 and the inner surface IS, a sound conduit may be further installed inside the housing 11 to output the sound of the high-frequency acoustic unit 14 toward the user's ear canal, with one end of the sound conduit acoustically coupled to one side of the diaphragm of the high-frequency acoustic unit 14 and the other end of the sound conduit positioned toward the inner surface IS.

[0096] In some embodiments, the high-frequency acoustic unit 14 may be positioned above the low-frequency acoustic unit 13 in the thickness direction Z. That is, in the thickness direction Z, the high-frequency acoustic unit 14 is closer to the inner surface IS than the low-frequency acoustic unit 13. In some embodiments, as shown in Figure 18D, the high-frequency acoustic unit 14 may be positioned outside the housing 11, that is, the high-frequency acoustic unit 14 may be positioned on the inner surface IS. In some embodiments, the high-frequency acoustic unit 14 may be positioned inside the corresponding side wall (i.e., the inner surface IS) of the housing 11. The orientation of the sound guide hole corresponding to the high-frequency acoustic unit 14 (e.g., the third sound guide hole 113) may be the same as the orientation of the first sound guide hole 111.

[0097] In some embodiments, when the acoustic output device 10 is mounted in the manner shown in Figure 8, the rear side RS of the housing 11 is inserted into the concha, and in this case, the frequency response curves of the acoustic output device 10 corresponding to the high-frequency acoustic unit 14 at different mounting positions are as shown in Figures 19A and 19B. As shown in Figures 19A and 19B, curve L 191 This is the frequency response curve of the acoustic output device when the low-frequency acoustic unit 13 is operating alone, and curve L192 This is the frequency response curve of the acoustic output device when the high-frequency acoustic unit 14 operates alone, and curve L 193 This is the frequency response curve of the acoustic output device when the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14, corresponding to Figure 18A, are operating simultaneously, and curve L 194 This is the frequency response curve of the acoustic output device when the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14, corresponding to Figure 18B, are operating simultaneously, and curve L 195 This is the frequency response curve of the acoustic output device when the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14, corresponding to Figure 18C, are operating simultaneously, and curve L 196 This is the frequency response curve of the acoustic output device when the low-frequency acoustic unit 13 and the high-frequency acoustic unit 14, corresponding to Figure 18D, are operating simultaneously. As shown in Figures 19A and 19B, curve L is the curve when the high-frequency acoustic unit 14 is not installed. 191 In contrast, the curve L on which the high-frequency acoustic unit 14 is installed 193 , curve L 194 , curve L 195 , and curve L 196 This improves sensitivity at high frequencies (e.g., 8 kHz or higher). In other words, by installing the high-frequency acoustic unit 14, the acoustic output effect of the acoustic output device 10 in the high-frequency range can be effectively improved. Curve L 193 , curve L 194 and curve L 195 Compared to curve L 196 The overall sensitivity is greatest. In other words, of the four installation positions shown in Figures 18A to 18D, the structure in which the high-frequency acoustic unit 14 shown in Figure 18D is installed on the inner surface IS can further improve the acoustic output effect of the acoustic output device 10.

[0098] Some embodiments of this specification further provide another acoustic output device which includes a low-frequency acoustic unit, a high-frequency acoustic unit, a housing and a support structure. Herein, the structure of the low-frequency acoustic unit, high-frequency acoustic unit, housing and support structure of the acoustic output device is installed similarly to or identical to the structure of the low-frequency acoustic unit 13, high-frequency acoustic unit 14, housing 11 and support structure 12 installed in the acoustic output device 10. The difference between this acoustic output device and the acoustic output device 10 is that, in addition to the first and second sound guides corresponding to the low-frequency acoustic unit and the third sound guide corresponding to the high-frequency acoustic unit, the housing 11 may include another sound guide (e.g., a fourth sound guide) corresponding to the high-frequency acoustic unit, and the third and fourth sound guides are installed on both sides of the diaphragm of the high-frequency acoustic unit, allowing the high-frequency acoustic unit to radiate sound through the third and fourth sound guides, respectively. The third and fourth sound guides also constitute a dipole, enhancing the reduction of far-field sound leakage of the acoustic output device and improving the output effect of the acoustic output device. For more details on this acoustic output device, please refer to the relevant description of the acoustic output device 10 above, which will be omitted here.

[0099] Having explained the basic concepts above, it will be clear to those skilled in the art that the above detailed disclosure is merely illustrative and does not limit the present application. Although not explicitly stated in the present application, those skilled in the art can make various changes, improvements, and modifications to the present application. These changes, improvements, and modifications are suggested by the present application and still remain within the spirit and scope of the exemplary embodiments of the present application.

[0100] Furthermore, certain terms are used in this Application to describe embodiments thereof. For example, “one embodiment,” “one embodiment,” and / or “several embodiments” mean certain features, structures, or properties relating to at least one embodiment of this Application. Therefore, it should be emphasized and understood that two or more references to “one embodiment,” “one embodiment,” or “one alternative embodiment” in various parts of this Specification do not necessarily refer to the same embodiment. Also, certain features, structures, or properties in one or more embodiments of this Application may be appropriately combined.

[0101] Similarly, in the foregoing description of the embodiments of this application, it should be understood that, in order to simplify the description of the disclosure of this application and to aid in understanding one or more embodiments of the invention, various features may be grouped together in a single embodiment, drawing or description. However, such a method of disclosure does not mean that the claimed subject matter requires more features than those enumerated in each claim. Rather, the features of an embodiment may be fewer than all the features of the single embodiment disclosed above.

[0102] In some embodiments, numbers are used to describe the number of components and attributes, and these numbers describing such embodiments should be understood to be modified in some cases by the modifiers “about,” “approximately,” or “generally.” Unless otherwise specified, “about,” “approximately,” or “generally” indicates that the above numbers are allowed to vary by ±20%. Therefore, in some embodiments, the numerical parameters used in the specification and claims are all approximations that may vary depending on the characteristics required for the individual embodiment. In some embodiments, the numerical parameters should be treated with regard to the specified number of significant figures, and the usual place-keep method should be applied. In some embodiments of this application, the numerical ranges and parameters used to determine the range are approximations, but in specific embodiments, such numbers should be set as precisely as possible.

[0103] Finally, it should be understood that the embodiments described herein are merely illustrative of the principles of the embodiments herein. Other modifications may also be within the scope of this application. Therefore, alternative configurations of the embodiments herein may be considered consistent with the teachings herein, for example, without limitation. Thus, the embodiments herein are not limited to those explicitly introduced and described herein. [Explanation of symbols]

[0104] 10. Audio output device 11 Housing 12 Support structure 13 Low-frequency acoustic units 14 High-frequency acoustic unit 100 Auricle 111 First tone channel 112 Second tone channel 113 Third tone channel

Claims

1. Low-frequency acoustic unit and High-frequency acoustic unit and, A housing configured to accommodate at least the low-frequency acoustic unit and the high-frequency acoustic unit, The housing includes a support structure configured to be attached near the ear canal, in a position that does not block the ear canal opening, At least two sound ducts are provided in the housing, and the first and second sound ducts of the at least two sound ducts are 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 and second sound ducts. An acoustic output device wherein one of the at least two sound guide holes is acoustically coupled to one side of the diaphragm of the high-frequency acoustic unit, the high-frequency acoustic unit radiates sound to the outside of the housing through the one sound guide hole, and when worn, the sound guide hole corresponding to the high-frequency acoustic unit faces the user's ear canal.

2. The aforementioned one sound conduit is the third sound conduit, The low-frequency acoustic unit radiates sound to the outside of the housing through the first sound guide hole and the second sound guide hole. The high-frequency acoustic unit radiates sound to the outside of the housing through the third sound guide hole. The acoustic output device according to claim 1, wherein the first sound guide hole, the second sound guide hole, and the third sound guide hole are each installed at different positions in the housing.

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

4. The acoustic output device according to claim 2, wherein the housing includes an inner surface that faces the anterior outer surface of the user's ear when worn, and both the first sound conduit and the third sound conduit are located on the inner surface.

5. The acoustic output device according to claim 1, wherein the housing includes an inner surface facing the anterior outer surface of the user's ear when worn, the one sound guide hole is the first sound guide hole, the first sound guide hole is acoustically coupled to one side of the diaphragm of the low-frequency acoustic unit and one side of the diaphragm of the high-frequency acoustic unit, the first sound guide hole is located on the inner surface, and the low-frequency acoustic unit and the high-frequency acoustic unit radiate sound into the user's ear canal through the first sound guide hole.

6. The acoustic output device according to claim 4 or 5, wherein the overlap ratio between the area of ​​the projection of the high-frequency acoustic unit onto the inner surface of the housing and the area of ​​the projection of the first sound guide hole onto the inner surface of the low-frequency acoustic unit is 10% or less.

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

8. The acoustic output device according to claim 7, wherein, when worn, one end of the housing away from the connection point is inserted 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, and in the short axis direction of the housing, the centroid of the projection of the high-frequency acoustic unit onto the inner surface is closer to the upper surface of the housing than the centroid of the projection of the first sound guide hole onto the inner surface of the low-frequency acoustic unit on the inner surface.

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

11. The acoustic output device according to claim 10, wherein, when worn, the housing covers at least partially the antihelix region of the user.

12. The acoustic output device according to claim 11, wherein the angle between the vibration direction of the high-frequency acoustic unit and the vibration direction of the low-frequency acoustic unit is within the range of 36° to 54°.

13. The acoustic output device according to claim 4 or 5, wherein the inner surface of the housing includes a projection area and a non-projection area of ​​a high-frequency acoustic unit, and 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 the difference in height between the projected area and the non-projected area in the thickness direction of the housing is 0.6 mm or more.

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 projected region and the non-projected region 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 surface of the housing includes a projection area and a non-projection area of ​​a high-frequency acoustic unit, and the projection area and the non-projection area are flush with each other.

17. The acoustic output device according to claim 4 or 5, wherein the inner surface of the housing includes a projection region and a non-projection region of the high-frequency acoustic unit, and the ratio of the difference in height between the projection region and the non-projection region of the housing to the thickness of the housing in the thickness direction is less than 0.

3.

18. The acoustic output device according to claim 1, wherein the minimum resonant frequency corresponding to the high-frequency acoustic unit is 5 kHz or higher, and the minimum resonant frequency corresponding to the low-frequency acoustic unit is 1 kHz or lower.

19. Low-frequency acoustic unit and High-frequency acoustic unit and, A housing configured to accommodate at least the low-frequency acoustic unit and the high-frequency acoustic unit, The housing includes a support structure configured to be attached near the ear canal, in a position that does not block the ear canal opening, The housing is provided with at least two sound ducts, and the low-frequency acoustic unit and the high-frequency acoustic unit each radiate sound to the outside of the housing through one or more of the at least two sound ducts. The housing includes an inner surface facing the anterior outer surface of the user's ear when worn, and one of the at least two sound ducts is located on the inner surface and is acoustically in communication with the low-frequency acoustic unit, and when worn, the sound duct corresponding to the high-frequency acoustic unit faces the user's ear canal. An acoustic output device in which the overlap ratio between the area of ​​the projection of the high-frequency acoustic unit onto the inner surface of the housing and the area of ​​the projection of the sound guide hole on the inner surface of the low-frequency acoustic unit onto the inner surface is 10% or less.

20. The acoustic output device according to claim 19, wherein 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 housing through the one sound guide hole.

21. The at least two sound conduits include a first sound conduit, a second sound conduit, and a third sound conduit. The low-frequency acoustic unit radiates sound to the outside of the housing through the first sound guide hole and the second sound guide hole. The high-frequency acoustic unit radiates sound to the outside of the housing through the third sound guide hole. The acoustic output device according to claim 19 or 20, wherein the first sound guide hole, the second sound guide hole, and the third sound guide hole are each installed at different positions in the housing.

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

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

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

25. The acoustic output device according to claim 21 or 24, wherein the centroid of the projection of the high-frequency acoustic unit onto the inner surface of the housing is closer to the connection point between the support structure and the housing than the centroid of the projection of the sound guide hole on the inner surface of the low-frequency acoustic unit onto the inner surface.

26. The acoustic output device according to claim 25, wherein, when worn, one end of the housing away from the connection point is inserted into the user's concha.

27. The acoustic output device according to claim 26, wherein the housing includes a short axis direction and a long axis direction, and in the short axis direction of the housing, the centroid of the projection of the high-frequency acoustic unit onto the inner surface is closer to the upper surface of the housing than the centroid of the projection of the sound guide hole on the inner surface of the low-frequency acoustic unit onto the inner surface.

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

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

30. The acoustic output device according to claim 29, wherein the angle between the vibration direction of the high-frequency acoustic unit and the vibration direction of the low-frequency acoustic unit is within the range of 36° to 54°.

31. The acoustic output device according to claim 21 or 24, wherein the inner surface of the housing includes a projection area and a non-projection area of ​​a high-frequency acoustic unit, and 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 the difference in height between the projected area and the non-projected area in the thickness direction of the housing is 0.6 mm or more.

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 projected region and the non-projected region 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 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 with each other.

35. The acoustic output device according to claim 21 or 24, wherein the inner surface of the housing includes a projection region and a non-projection region of the high-frequency acoustic unit, and the ratio of the difference in height between the projection region and the non-projection region of the housing to the thickness of the housing in the thickness direction is less than 0.

3.

36. The acoustic output device according to claim 19, wherein the minimum resonant frequency corresponding to the high-frequency acoustic unit is 5 kHz or higher, and the minimum resonant frequency corresponding to the low-frequency acoustic unit is 1 kHz or lower.

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