An open acoustic device

Abstract

The embodiment of the specification provides an open acoustic device, which comprises: a sound generating part, comprising a shell and a diaphragm accommodated in the shell, the diaphragm is vibrated to generate sound, a sound outlet hole is arranged on the side wall of the shell facing the auricle, and the sound outlet hole is configured to guide the sound generated by the diaphragm out of the shell; a wearing structure configured to wear the sound generating part near the ear canal but not to block the ear canal opening; wherein the sound outlet hole and the auricle have a first projection and a second projection respectively on the sagittal plane of the human body, the centroid of the first projection and the highest point of the second projection have a first distance in the direction of the vertical axis of the human body, the ratio of the first distance to the height of the second projection in the vertical axis direction is between 0.4-0.7, the centroid of the first projection and the end point of the second projection have a second distance in the direction of the sagittal axis of the human body, and the ratio of the second distance to the width of the second projection in the direction of the sagittal axis is between 0.65-0.8.

Description

Technical Field

[0001] This application relates to the field of acoustic technology, and in particular to an open acoustic device. Background Technology

[0002] With the development of acoustic output technology, acoustic devices (such as headphones) have been widely used in people's daily lives. They can be used with electronic devices such as mobile phones and computers to provide users with a better listening experience. Traditional acoustic devices generally block the ear canal opening or cover the entire ear, creating a sealed acoustic environment. This makes it difficult for users to receive sounds from the environment (such as horns, car bells, surrounding voices, traffic signals, etc.) after wearing the acoustic device, posing a safety hazard. Based on this, open-back acoustic devices (such as open-back headphones) have begun to be widely used.

[0003] The focus of open-back acoustic devices is to create an acoustic environment that is relatively open to the ear canal. In the design process of open-back acoustic devices, existing technical solutions often overlook the impact of ambient sound on the stability of the device and the user experience. Summary of the Invention

[0004] One embodiment of this specification provides an open acoustic device, comprising: a sound-generating part including a housing and a diaphragm housed within the housing, the diaphragm vibrating to generate sound, a sound outlet being provided on a side wall of the housing facing the auricle, the sound outlet being configured to guide the sound generated by the diaphragm out of the housing; and a wearing structure configured to wear the sound-generating part near the ear canal without blocking the ear canal opening; wherein the sound outlet and the auricle have a first projection and a second projection respectively in the sagittal plane of the human body, the centroid of the first projection and the highest point of the second projection are at a first distance in the direction of the vertical axis of the human body, the ratio of the first distance to the height of the second projection in the vertical axis direction is between 0.4 and 0.7, the centroid of the first projection and the end point of the second projection are at a second distance in the direction of the sagittal axis of the human body, the ratio of the second distance to the width of the second projection in the sagittal axis direction is between 0.65 and 0.8.

[0005] In some embodiments, the distance between the centroid of the outer end face of the sound outlet and the centroid of the ear canal opening is in the range of 5mm-13mm.

[0006] In some embodiments, the distance between the centroid of the first projection and the centroid of the projection of the ear canal opening onto the sagittal plane ranges from 2 mm to 10 mm.

[0007] In some embodiments, the distance between the centroid of the ear canal opening and the outer end face of the sound outlet is within the range of 8mm-13mm.

[0008] In some embodiments, the area of ​​the sound outlet is 10 mm². 2 -60mm 2 .

[0009] In some embodiments, the minimum distance between the centroid of the projection of the ear canal opening onto the sagittal plane and the first projection ranges from 1 mm to 10 mm.

[0010] In some embodiments, the sound outlet and the auricle have a third projection and a fourth projection respectively on the coronal plane of the human body, the centroid of the third projection and the outer endpoint of the fourth projection have a third distance in the coronal axis direction of the human body, and the ratio of the third distance to the length of the fourth projection in the coronal axis direction is between 0.8 and 1.4.

[0011] In some embodiments, the distance between the centroid of the third projection and the centroid of the projection of the ear canal opening onto the coronal plane ranges from 4 mm to 12 mm.

[0012] In some embodiments, the minimum distance between the centroid of the projection of the ear canal opening onto the coronal plane and the third projection ranges from 7mm to 10mm.

[0013] In some embodiments, the distance between the centroid of the outer end face of the sound outlet and the top point of the tragus ranges from 8mm to 12mm.

[0014] In some embodiments, the distance between the centroid of the first projection and the projection of the apex of the tragus onto the sagittal plane ranges from 5 mm to 12 mm.

[0015] In some embodiments, the distance between the top point of the tragus and the outer end face of the sound outlet is within the range of 2mm-10mm.

[0016] In some embodiments, the minimum distance between the projection of the apex of the tragus onto the sagittal plane and the first projection ranges from 2 mm to 10 mm.

[0017] In some embodiments, the length of the perpendicular line from the centroid of the ear canal opening to the outer end face of the sound outlet hole ranges from 7mm to 13mm.

[0018] In some embodiments, the length of the perpendicular line from the centroid of the outer end face of the sound outlet to the plane containing the ear canal opening ranges from 2mm to 12mm.

[0019] In some embodiments, the distance between the centroid of the outer end face of the sound outlet and the centroid of the ear canal opening on the plane is in the range of 0.2mm-8mm.

[0020] In some embodiments, the outer end face of the sound outlet is further away from the ear canal opening relative to the tragus and helix; the area of ​​the overlapping region between the orthographic projection of the outer end face of the sound outlet onto the plane containing the closed surface of the ear and the closed surface is 10 mm. 2 -120mm 2 The closed surface is the cross section with the largest area among the cross sections parallel to the ear canal opening within the space enclosed by the concha, tragus, and crus of the helix.

[0021] In some embodiments, the angle between the outer end face of the sound outlet and the plane containing the ear canal opening is 0°-10°.

[0022] In some embodiments, the first distance is 25mm-38mm.

[0023] In some embodiments, the second distance is 27mm-31mm.

[0024] In some embodiments, the wearing structure includes an ear hook; in the wearing state, the ear hook extends from the back of the auricle to the frontal lateral surface of the auricle and connects with the sound-emitting part, the sound-emitting part extending into the concha cavity; in the non-wearing state, the distance between the centroid of the outer end face of the sound outlet and the ear hook plane is 0.1mm-5mm.

[0025] In some embodiments, the angle formed between the inner side of the housing and the ear hook plane ranges from 0° to 10°.

[0026] In some embodiments, the distance between the centroid of the sound outlet and the lower side surface of the housing ranges from 4mm to 9mm.

[0027] In some embodiments, the outer end face of the sound outlet protrudes beyond the inner surface of the housing.

[0028] In some embodiments, the protrusion height of the outer end face of the sound outlet relative to the inner side face of the sound-emitting part ranges from 0.1mm to 6mm.

[0029] In some embodiments, the wearing structure includes an abutment and an ear hook, the ear hook connecting the sound-emitting part and the abutment; in the wearing state, the abutment abuts against the back of the wearer's ear, and the ear hook passes around the wearer's antihelix and helix.

[0030] In some embodiments, the open acoustic device is equipped with a microphone for acquiring ambient noise, and the open acoustic device is capable of playing noise-reduced sounds that cancel out the ambient noise. Attached Figure Description

[0031] This application will be further described by way of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting; in these embodiments, the same reference numerals denote the same structures, wherein:

[0032] Figure 1A These are exemplary ear diagrams shown according to some embodiments of this specification;

[0033] Figure 1B This is a schematic diagram of a horizontal cross-section of an ear model according to some embodiments of this specification;

[0034] Figure 2A This is a schematic diagram of the structure of the sound-emitting part of an open acoustic device according to some embodiments of this specification;

[0035] Figure 2B These are exemplary wearing diagrams of open-back acoustic devices according to some embodiments of this specification;

[0036] Figure 3A These are exemplary wearing diagrams of open-back acoustic devices according to some embodiments of this specification;

[0037] Figure 3B This is a schematic diagram of an acoustic model of a cavity-like structure according to some embodiments of this specification;

[0038] Figure 4A This is an exemplary wearing diagram of an open acoustic device in the sagittal plane according to some embodiments of this specification;

[0039] Figure 4B yes Figure 4A An enlarged schematic diagram of the projection of the open acoustic device onto the sagittal plane;

[0040] Figure 4C yes Figure 4A The enlarged schematic diagram of the ear and open-back acoustic device shown in the wearing diagram;

[0041] Figure 4D This is an exemplary wearing diagram of an open acoustic device in the coronal plane according to some embodiments of this specification;

[0042] Figure 4E This is a schematic diagram of the sound outlet and auricle in the coronal plane of an open acoustic device according to some embodiments of this specification;

[0043] Figure 4F yes Figure 4E An enlarged schematic diagram of the projection of the open acoustic device onto the coronal plane;

[0044] Figures 5A-5GThis is a schematic diagram showing the relative positions of the sound outlet and the ear canal opening according to some embodiments of this specification;

[0045] Figure 5H This is a schematic diagram of the enclosed surface of an acoustic device worn in the ear, as shown in some embodiments of this specification;

[0046] Figures 6A-6H This is a scatter plot illustrating the test results of testers according to some embodiments of this specification;

[0047] Figure 7A This is a schematic diagram showing an open acoustic device worn on an ear model to form a reference surface, according to some embodiments of this specification;

[0048] Figure 7B This is a schematic diagram of multiple target points formed by moving a reference plane according to some embodiments of this specification;

[0049] Figure 8 This is a schematic diagram of the structure of an ear-hook open-back headphone in an unworn state, according to some embodiments of this specification;

[0050] Figure 9 This is a structural schematic diagram of an ear clip-on open-back headphone in an unworn state, according to some embodiments of this specification. Detailed Implementation

[0051] To more clearly illustrate the technical solutions of the embodiments in this specification, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this specification. For those skilled in the art, these drawings can be applied to other similar scenarios without creative effort. Unless obvious from the context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0052] It should be understood that the terms “system,” “device,” “unit,” and / or “module” used herein are one way to distinguish different components, elements, parts, sections, or assemblies at different levels. However, if other terms can achieve the same purpose, they may be replaced by other expressions.

[0053] As indicated in this specification and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0054] In the description of this specification, it should be understood that the terms "first," "second," "third," "fourth," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of that feature. In the description of this specification, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0055] In this specification, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, the term "connection" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this specification according to the specific circumstances.

[0056] For non-open-back acoustic devices (e.g., in-ear headphones), the listening experience is generally consistent across different users, and noise cancellation requirements are low. This is mainly because in-ear headphones and the ear canal together form a closed cavity, and the differences in listening experience (e.g., volume) between different users are primarily affected by differences in the ear canal. However, unlike non-open-back acoustic devices, when using open-back acoustic devices (e.g., open-back headphones), due to differences in the shape, size, and relative position of various structures in different users' ears, the listening experience (e.g., volume) varies significantly when different users wear the same open-back acoustic device. This results in poor consistency in listening experience among different users, increasing the need for noise cancellation when using open-back headphones. Therefore, this specification provides an open-back acoustic device that achieves better consistency in listening experience among different users.

[0057] Figure 1A This is a schematic diagram of an exemplary ear according to some embodiments of this specification. See also Figure 1A The ear 100 may include an external auditory canal 101, a concha 102, a cymba conchae 103, a triangular fossa 104, an antihelix 105, a scaphoid fossa 106, an auricle 107, an earlobe 108, an auricle 110, a tragus 1010, an outer contour 1013 of the auricle, and an inner contour 1014 of the auricle. The outer port of the external auditory canal 101 is the ear canal opening 101a. For a more detailed description of the ear canal opening 101a, please refer to [link to relevant documentation]. Figure 1BThe relevant content is as follows. It should be noted that, for ease of description, in the embodiments of this specification, the upper antihelix 1011, the lower antihelix 1012, and the antihelix 105 are collectively referred to as the antihelix region. In other descriptions of the specification, the external auditory canal 101 may also be simply referred to as the "ear canal." In some embodiments, the support of one or more parts of the ear 100 for the open-back acoustic device can achieve stable wearing of the open-back acoustic device, thereby ensuring the user's listening effect. In some embodiments, the external auditory canal 101, concha 102, cymba concha 103, triangular fossa 104, etc., have a certain depth and volume in three-dimensional space, which can be used to meet the wearing requirements of the open-back acoustic device. In some embodiments, the wearing of an open-back acoustic device (e.g., open-back headphones) can be achieved using other parts of the ear 100 besides the external auditory canal 101.

[0058] It should be noted that in medicine, anatomy, and other fields, the human body can be defined by three basic planes: the sagittal plane, the coronal plane, and the horizontal plane, as well as three basic axes: the sagittal axis, the coronal axis, and the vertical axis. The sagittal plane is a plane perpendicular to the ground along the anteroposterior direction of the body, dividing the body into left and right parts. The coronal plane is a plane perpendicular to the ground along the left-right direction of the body, dividing the body into anterior and posterior parts. The horizontal plane is a plane parallel to the ground along the vertical direction of the body, dividing the body into superior and inferior parts. Correspondingly, the sagittal axis is the axis along the anteroposterior direction of the body and perpendicular to the coronal plane; the coronal axis is the axis along the left-right direction of the body and perpendicular to the sagittal plane; and the vertical axis is the axis along the vertical direction of the body and perpendicular to the horizontal plane. Furthermore, the anterior side of the ear, as described in this application, refers to the side of the ear facing the face along the sagittal axis. Among them, by observing the ear of the simulator along the direction of the human coronal axis, one can obtain... Figure 1A The diagram shows the front outline of the ear.

[0059] By utilizing parts of the ear 100 other than the external auditory canal 101, the wearing of an open-back acoustic device and the propagation of sound can be achieved, thus "liberating" the user's external auditory canal 101. When a user wears an open-back acoustic device (e.g., open-back headphones), the device does not block the user's external auditory canal 101. The user can receive both sound from the open-back device and sounds from the environment (e.g., horns, car bells, surrounding voices, traffic signals, etc.), thereby reducing the probability of traffic accidents. For example, when a user wears open-back headphones, the entire or part of the sound-producing part can contact the upper part of the external auditory canal 101 (e.g., the location of one or more parts such as the helix 109, cymba conchae 103, triangular fossa 104, antihelix 105, scaphoid fossa 106, and helix 107). For example, when a user wears open-back headphones, the entire or part of the sound-producing structure can be located within a cavity formed by one or more parts of the ear (e.g., the concha 102, the cymba concha 103, the triangular fossa 104, etc.). Figure 1A The region M1, enclosed by the dashed line, includes at least the cymba conchae 103 and the triangular fossa 104, and the region M2, which includes at least the cavum conchae 102.

[0060] Individual differences may exist among users, resulting in variations in ear shape, size, and other dimensional differences. For ease of description and understanding, unless otherwise specified, this specification will primarily use an ear model with a "standard" shape and size as a reference to further describe the relative position of the open-back acoustic device to the ear when worn on this ear model in different embodiments. For example, a simulator containing the head and its (left and right) ears, such as GRAS KEMAR, HEAD Acoustics, B&K 4128 series, or B&K 5128 series, manufactured based on ANSI:S3.36, S3.25, and IEC:60318-7 standards, can be used as a reference for wearing the open-back acoustic device, thus representing the scenario of most users normally wearing the open-back acoustic device. Taking GRAS KEMAR as an example, the ear simulator can be any one of GRAS 45AC, GRAS 45BC, GRAS45CC, or GRAS 43AG. Using HEAD Acoustics as an example, the ear simulator can be any one of HMS II.3, HMS II.3LN, or HMS II.3LN HEC. It should be noted that the data range measured in the embodiments of this specification is based on GRAS 45BC KEMAR measurements. However, it should be understood that differences may exist between different head and ear models, and the relevant data range may fluctuate by ±10% when using other models. As an example only, the ear model used for reference may have the following characteristics: the projection of the auricle 110 in the sagittal plane along the vertical axis can be in the range of 55-65 mm; the projection of the auricle 110 in the sagittal plane along the sagittal axis can be in the range of 45-55 mm; and the projection of the auricle 110 in the coronal plane along the coronal axis can be in the range of 15-25 mm. The projection of the auricle 110 in the sagittal plane refers to the projection of the edge of the auricle in the sagittal plane. The edge of the auricle 110 is composed at least of the outer contour of the helix, the contour of the earlobe, the contour of the tragus, the intertragus notch, the antitragus apex, and the helix-tragus notch. Therefore, in this application, descriptions such as "user wearing," "in wearing state," and "under wearing state" can refer to the open acoustic device described in this application being worn on the ear of the aforementioned simulator. Of course, considering the individual differences among different users, the structure, shape, size, thickness, etc. of one or more parts of the ear 100 can be differentiated according to different shapes and sizes of ears. These differentiated designs can be manifested in the characteristic parameters of one or more parts of the open acoustic device (e.g., the sound-emitting part, wearing structure, etc. mentioned below) having different ranges of values, thereby adapting to different ears.Because ears vary in shape, size, and other dimensions, different users may experience different sound effects. To minimize these differences and improve the consistency of sound effects for different users, this manual has addressed this issue, as detailed below. In this manual, the relative positions (e.g., distance, angle) of components of the open-back acoustic device (such as the sound outlet) to various ear structures (such as the ear canal opening 101a and the tragus 1010) refer to the relative positions (e.g., distance, angle) of the components of the open-back acoustic device to the corresponding structures of the ear when an ear model with a "standard" shape and size is wearing the open-back acoustic device.

[0061] Figure 1B This is a schematic diagram of a horizontal cross-section of an ear model according to some embodiments of this specification. The outer port of the external auditory canal 101 is the ear canal opening 101a. Due to the complex shape of the ear canal opening 101a, in some embodiments, the position of the ear canal opening 101a can be defined in an ear model with a "standard" shape and size by the positional features of one or more structures of the ear, such as by the tragus 1010, the external auditory canal 101, the concha 102, or a combination thereof. Specifically, in some embodiments, the ear canal opening 101a can be a cross-section formed by cutting the external auditory canal 101 from a first reference plane J related to the tragus 1010 and the concha 102. For example, a horizontal cross-section is formed by cutting through a horizontal plane passing through the tragus 1010, the external auditory canal 101, and the concha 102 onto an ear model (the posture of the ear model corresponds to the posture of the ear in an upright human body). A first reference plane K can be selected as the abrupt change point on the cross-section line passing through the inner surface of the concha 102 and perpendicular to the cross-section line on the inner surface of the tragus 1010. The abrupt change point can be understood as the point where the first derivative on the cross-section line of the inner surface of the concha 102 is zero. It should be noted that the tragus 1010 is a flap-shaped ridge structure composed of cartilage and skin located lateral to the ear canal opening 101a. The apex point 1010a of the tragus 1010, as described below, can be understood as the highest point of the flap-shaped ridge structure along the coronal axis away from the ear on this horizontal cross-section.

[0062] The description of the ear 100 above is for illustrative purposes only and is not intended to limit the scope of this application. Those skilled in the art can make various changes and modifications based on the description in this application. For example, the entire or partial structure of the sound-emitting part of an open acoustic device may also contact the tragus 1010. These changes and modifications are still within the protection scope of this application.

[0063] Figure 2A This is a schematic diagram of the structure of the sound-generating part of an open acoustic device according to some embodiments of this specification. Figure 2BThis is an exemplary wearing diagram of an open-back acoustic device according to some embodiments of this specification. Figure 2A and Figure 2B As shown, the open acoustic device 10 may include a sound-emitting part 11 and a wearing structure 12.

[0064] In some embodiments, the sound-emitting part 11 can be worn on a user's body (e.g., the head, neck, or upper torso) via a wearing structure 12. The sound-emitting part 11 may have a speaker that generates sound to be input to the user's ear 100. In some embodiments, the sound-emitting part 11 may be annular, elliptical, polygonal (regular or irregular), U-shaped, V-shaped, or semi-circular, so that the sound-emitting part 11 can be directly attached to the user's ear 100. For details regarding the specific structure of the wearing structure 12, please see the relevant content below.

[0065] In some embodiments, the sound-emitting part 11 of the open acoustic device 10 may include a housing 111 and a speaker assembly 112 housed within the housing. The housing 111 may serve as a structure for housing and supporting components (such as diaphragms, magnets, etc.) of the speaker assembly 112. The diaphragm is one of the components of the speaker assembly 112, and the diaphragm vibrates to produce sound. There may be one, two, or more diaphragms.

[0066] In some embodiments, the housing 111 may include a rigid housing and a flexible body for contacting the user's concha 102. In some embodiments, the rigid material may be plastic, metal, or other supporting materials that can be used as the headphone housing to provide better support and stability for the internal structure of the housing 111 (such as the diaphragm of the speaker assembly 112). In some embodiments, the rigid housing may include a first rigid housing and a second rigid housing, wherein the first rigid housing is away from the user's concha 102 when worn, and the second rigid housing is towards the user's concha 102 when worn. The first and second rigid housings enclose a receiving cavity in which the diaphragm of the speaker assembly 112 is disposed. The flexible body covers the outer wall of the second rigid housing and may be made of silicone or other skin-friendly flexible materials to improve the comfort of the sound-emitting part 11 when in contact with the user.

[0067] In some embodiments, the first rigid shell and the second rigid shell can provide better support for the internal structure. When worn, the second rigid shell can face the user's concha 102 and will be in contact with the user. In this embodiment, a flexible body is used to cover the outer wall of the second rigid shell, which can improve the wearing comfort of the open-back acoustic device 10.

[0068] In some embodiments, a sound outlet 113 may be formed on the housing 111 of the sound-generating part 11. In some embodiments, when worn, the sound outlet 113 may be formed on the side wall of the housing 111 facing the ear canal opening 101a (the inner side 114 described elsewhere in this specification), thereby guiding the sound generated by the diaphragm out of the housing 111 and into the user's external ear canal 101. It should be noted that in the figures of this specification (such as...), Figure 2A This example only illustrates the area where the sound outlet 113 is located. It is understood that, since the housing 111 of the sound-generating part 11 has a certain thickness, and the sound outlet 113 is formed on the housing 111 to guide the sound generated by the diaphragm 112 to the outside of the open acoustic device 10, the sound outlet 113 also has a certain depth. Based on this, the sound outlet 113 has an inner end face and an outer end face 1131. The inner end face of the sound outlet 113 can be understood as the end face of the sound outlet 113 located on the inner wall surface of the housing, and the outer end face 1131 of the sound outlet 113 can be understood as the end face of the sound outlet 113 located on the outer wall surface of the housing. In the following text, the centroid of the outer end face 1131 of the sound outlet 113 can be understood as the geometric center of the end face of the sound outlet 113 located on the outer wall surface of the housing. In some embodiments, if a protective mesh (e.g., steel mesh) is provided on the outer end face 1131 of the sound outlet 113, the centroid of the outer end face 1131 of the sound outlet 113 can also be equivalent to the geometric center of the protective mesh. In some embodiments, the number of sound outlets 113 can be one or more. As an example only, when the number of sound outlets 113 is multiple, the outer end face of the sound outlet 113 can be the area formed by the centroids of the outer end faces of all the sound outlets 113. For example, the area enclosed by connecting the centroids of the sound outlets 113 located at the edges of all the sound outlets 113 can be used as the outer end face of the sound outlet 113.

[0069] In some embodiments, the sound outlet 113 can be located on the second rigid housing and the flexible body. By setting the sound outlet 113 on the second rigid housing and the flexible body, the sound outlet 113 does not extend into the first rigid housing, which facilitates the splicing and fixing of the ends of the first rigid housing and the ends of the second rigid housing, improving accuracy. In addition, this arrangement can also prevent misalignment of the sound outlet 113, and also facilitates the installation of protective mesh (such as steel mesh) and sound-adjusting mesh on the sound outlet 113.

[0070] In some embodiments, when worn, the sound outlet 113 faces the ear canal opening 101a of the user's external auditory canal 101, and the sound outlet 113 is not blocked by the concha wall.

[0071] In some embodiments, the wearing structure 12 may be an ear hook, with the sound-emitting part 11 connected to one end of the ear hook. The ear hook may be configured to fit the user's ear. For example, the ear hook may be an arc-shaped structure. In some embodiments, the wearing structure 12 may also be a clamping structure (such as an ear clip) that fits the user's auricle 110, so that the wearing structure 12 can be clamped at the user's auricle 110. In some embodiments, the wearing structure 12 may include, but is not limited to, a headband structure, an elastic band, etc., so that the open-back acoustic device 10 can be better hung on the user and prevent the user from falling off during use. In some embodiments, the open-back acoustic device 10 may be combined with products such as glasses, headphones, head-mounted displays, AR / VR helmets, etc., in which case the sound-emitting part 11 may be worn near the user's ear 100 by suspension or clamping. Specific structures of other examples of the wearing structure 12 are also described elsewhere in the specification. For example... Figure 3A , Figure 9 Related explanations.

[0072] In some embodiments, the wearing structure 12 is configured to wear the sound-emitting part 11 on the ear. In some embodiments, the wearing structure 12 is configured to wear the sound-emitting part 11 near the ear canal (i.e., the external auditory canal 101) but without blocking the ear canal opening 101a.

[0073] Combination Figure 1A , Figure 2B In some embodiments, when a user wears the open-back acoustic device 10, at least a portion of the sound-emitting part 11 may be located in... Figure 1A The diagram shows the region J in front of the tragus 1010 of the user's ear 100, or the anterolateral surface regions M1 and M2 of the auricle 110. The following will provide illustrative examples in conjunction with different wearing positions (11A, 11B, and 11C) of the sound-emitting part 11. It should be noted that, in the embodiments of this specification, the anterolateral surface of the auricle 110 refers to the side of the auricle 110 facing away from the head along the coronal axis; correspondingly, the posteromedial surface of the auricle 110 refers to the side of the auricle 110 facing the head along the coronal axis.

[0074] like Figure 2BAs shown, in some embodiments, the sound-emitting part 11 may have a major axis direction Y and a minor axis direction Z that are perpendicular to the thickness direction X and orthogonal to each other. The major axis direction Y can be defined as the direction with the maximum extension dimension in the shape of the two-dimensional projection surface of the sound-emitting part 11 (e.g., the projection of the sound-emitting part 11 onto the plane containing its outer surface, or its projection onto the sagittal plane). (e.g., when the projection shape is rectangular or approximately rectangular, the major axis direction is the length direction of the rectangle or approximately rectangular shape). The minor axis direction Z can be defined as the direction perpendicular to the major axis direction Y in the shape of the projection of the sound-emitting part 11 onto the sagittal plane (e.g., when the projection shape is rectangular or approximately rectangular, the minor axis direction is the width direction of the rectangle or approximately rectangular shape). The thickness direction X can be defined as a direction perpendicular to the two-dimensional projection surface.

[0075] In some embodiments, when worn, the sound-emitting part 11 can be in a vertical or near-vertical position, such as... Figure 2B The sound-emitting part 11A is shown. When the sound-emitting part 11A is in a vertical or near-vertical state (e.g., when the sound-emitting part 11A is worn), its major axis direction Y is parallel or nearly parallel to the sagittal plane with respect to its thickness direction X, and its minor axis direction Z is parallel or nearly parallel to the coronal plane. In some embodiments, the sound-emitting part 11A may be located on the side of the user's ear 100 facing the facial region along the sagittal axis, that is, the sound-emitting part 11A is located in the facial region J in front of the ear 100 (e.g., the area of ​​the face). Figure 1A (As shown).

[0076] In some embodiments, when worn, the sound-emitting part 11 can be in an inclined state, such as... Figure 2B The wearing condition of the sound-emitting part 11B is shown. When the sound-emitting part 11 is in an inclined state (for example, the wearing state of the sound-emitting part 11B), the major axis direction Y and the minor axis direction Z are still parallel or approximately parallel to the sagittal plane. The major axis direction Y may have a certain angle with the direction of the sagittal axis, that is, the major axis direction Y is also inclined accordingly; the minor axis direction Z may have a certain angle with the direction of the vertical axis, that is, the minor axis direction Z is also inclined.

[0077] In some embodiments, the sound-emitting part 11B may extend entirely or partially into the concha 102, meaning that the projection of the sound-emitting part 11B onto the sagittal plane overlaps with the projection of the concha 102 onto the sagittal plane. In some embodiments, the sound-emitting part 11B may also be in a horizontal or near-horizontal state when worn, such as... Figure 2BThe sound-emitting part 11C is shown. When the sound-emitting part 11C is in a horizontal or nearly horizontal state (e.g., when the sound-emitting part 11C is worn), the major axis direction Y can be consistent with or approximately consistent with the direction of the sagittal axis, both pointing in the anterior-posterior direction of the body; the minor axis direction Z can be consistent with or approximately consistent with the direction of the vertical axis, both pointing in the vertical direction of the body. It should be noted that, in the worn state, the sound-emitting part 11C being in a nearly horizontal state can mean... Figure 2B The angle between the long axis direction Y of the sound-emitting part 11C shown and the sagittal axis is within a certain range (e.g., not greater than 20°).

[0078] Furthermore, the wearing position of the vocal part 11 is not limited to Figure 2B The sound-emitting parts 11A, 11B, and 11C shown satisfy the following conditions: Figure 1A Region J, region M1, or region M2 as shown in the diagram are acceptable. For example, the entire or part of the sound-emitting part 11 can be located in... Figure 1A The area J enclosed by the dotted line. For example, the entire or partial structure of the sound-producing part may contact one or more of the following locations of the ear 100: helix crus 109, cymba conchae 103, triangular fossa 104, antihelix 105, scaphoid fossa 106, helix 107, tragus 1010, etc. For another example, the entire or partial structure of the sound-producing part 11 may be located within the cavity formed by one or more locations of the ear 100 (e.g., cavum conchae 102, cymba conchae 103, triangular fossa 104, etc.). Figure 1A The region M1, enclosed by the dashed line, includes at least the cymba conchae 103 and the triangular fossa 104, and the region M2, which includes at least the cavum conchae 102.

[0079] The open-back acoustic device 10 can be implemented in any one or a combination of the following ways: First, at least a portion of the wearing structure 12 is configured as a conformal structure that conforms to at least one of the posteromedial surface of the auricle 110 and the head, thereby increasing the contact area between the wearing structure 12 and the ear and / or head, and thus increasing the resistance to the open-back acoustic device 10 falling off the ear. Second, at least a portion of the wearing structure 12 is configured as an elastic structure, allowing it to deform under wearing conditions, thereby increasing the positive pressure of the wearing structure 12 on the ear and / or head, and thus increasing the resistance to the open-back acoustic device 10 falling off the ear. Third, at least a portion of the wearing structure 12 is configured to rest against the ear and / or head under wearing conditions, creating a reaction force that presses against the ear, so that the sound-emitting part 11 is pressed against the anterior lateral surface of the auricle 110 (e.g., Figure 1AThe regions M1 and M2 shown in the diagram increase the resistance to the open-back acoustic device 10 falling off the ear. Fourth, the sound-emitting part 11 and the wearing structure 12 are configured to clamp the antihelix region and the concha cavity region from the front outer side and the back inner side of the auricle 110 when worn, thereby increasing the resistance to the open-back acoustic device 10 falling off the ear. Fifth, the sound-emitting part 11 or the structure connected to it is configured to at least partially extend into the cavities such as the concha cavity 102, the cymba conchae 103, the triangular fossa 104, and the scaphoid fossa 106, thereby increasing the resistance to the open-back acoustic device 10 falling off the ear.

[0080] Different sizes and structural designs of the wearing structure 12 will result in different relative positions between the sound-generating part 11 and its components (such as the sound outlet 113) and the ear (such as the ear canal opening 101a, tragus 1010, etc.). The positional relationship between the sound-generating part 11 and its components (such as the sound outlet 113) and the ear (such as the ear canal opening 101a, tragus 1010, etc.) can be adjusted through the size and structural design of the wearing structure 12. The positional relationship between the sound-generating part 11 and its components (such as the sound outlet 113) and the ear (such as the ear canal opening 101a) can also be adjusted through the size and structural design of the housing 11, the placement of the sound outlet on the housing, and the size design of the sound outlet.

[0081] The following is combined Figure 3A and Figure 3B This paper introduces a specific structure of an open acoustic device. Figure 3A This is an exemplary wearing diagram of an open-back acoustic device according to some embodiments of this specification. In some embodiments, combined with Figure 3A and Figure 1A As shown, the wearing structure 12 of the open-back acoustic device 10 may include an ear hook. In the wearing state, the ear hook extends from the back of the auricle 110 to the frontal outer side of the auricle 110 and connects to the sound-emitting part 11, which extends into the concha cavity 102. At this time, the open-back acoustic device 10 can be an ear hook-type open-back headphone, meaning the ear hook places the sound-emitting part in the ear canal accessory but does not block the ear canal opening 101a.

[0082] In some embodiments, the ear hook can be configured to fit the user's ear shape. For example, the ear hook can be an arc-shaped structure. When worn, the ear hook can wrap around the user's auricle 110, so that the sound-emitting part 11 is located in the user's concha cavity 102 and contacts the concha cavity wall. In some embodiments, the ear hook may be provided with titanium wire, which extends along the extension direction of the ear hook. Compared with other materials, titanium wire has excellent properties such as high mechanical strength, high toughness, and light weight, thereby ensuring the stability and comfort of wearing the open-back acoustic device 10.

[0083] Reference Figure 3AIn some embodiments, the ear hook may include a first part 121 and a second part 122 connected in sequence. The first part 121 may be hung between the posteromedial side of the user's auricle and the head, and the second part 122 may extend to the anterolateral side of the auricle (the side of the auricle 110 away from the head along the coronal axis) and connect to the sound-emitting part 11, thereby placing the sound-emitting part 11 near the user's ear canal without blocking the ear canal opening 101a. Both the first part 121 and the second part 122 are arc-shaped structures.

[0084] In some embodiments, at least a portion of the sound-emitting part 11 may extend into the concha cavity 102. Exemplarily, in combination with... Figure 3A In the wearing state, the end FE of the sound-emitting part 11 (also referred to as the free end) can extend into the concha cavity 102. Optionally, the sound-emitting part 11 and the wearing structure 12 can be configured to clamp the aforementioned ear region from both the front and rear sides of the ear region corresponding to the concha cavity 102, thereby increasing the resistance to the open acoustic device 10 falling off the ear and improving the stability of the open acoustic device 10 in the wearing state. For example, the end FE of the sound-emitting part 11 is pressed into the concha cavity 102 in the thickness direction X. As another example, the end FE abuts against the concha cavity in the major axis direction Y and / or the minor axis direction Z (e.g., abutting against the inner wall of the opposite end FE of the concha cavity 102). It should be noted that the end FE of the sound-emitting part 11 refers to the end of the sound-emitting part 11 that is disposed opposite to the fixed end connected to the wearing structure 12, and is also referred to as the free end.

[0085] The sound-emitting part 11 can be a regular or irregular structure. Here, an exemplary description is provided to further illustrate the end FE of the sound-emitting part 11. For example, when the sound-emitting part 11 is a cuboid structure, the end wall of the sound-emitting part 11 is a plane. In this case, the end FE of the sound-emitting part 11 is the end sidewall opposite to the fixed end connected to the wearing structure 12. As another example, when the sound-emitting part 11 is a sphere, ellipsoid, or an irregular structure, the end FE of the sound-emitting part 11 can refer to a specific region away from the fixed end obtained by cutting along the YZ plane (the plane formed by the minor axis direction Z and the thickness direction X). The ratio of the dimension of this specific region along the major axis direction Y to the dimension of the sound-emitting part 11 along the major axis direction Y can be 0.05-0.2.

[0086] By extending at least partially into the concha 102, the listening volume at the listening position (e.g., at the ear canal opening 101a) can be increased, especially the mid-to-low frequency listening volume, while still maintaining a good far-field leakage cancellation effect. As an example only, when the entire or part of the structure of the sound-emitting part 11 extends into the concha 102, the sound-emitting part 11 and the concha 102 form a cavity-like structure (hereinafter referred to as a cavity-like structure). In the embodiments of this specification, the cavity-like structure can be understood as a semi-enclosed structure jointly enclosed by the sidewalls of the sound-emitting part 11 and the structure of the concha 102. This semi-enclosed structure ensures that the listening position (e.g., at the ear canal opening 101a) is not completely sealed and isolated from the external environment, but rather has a leakage structure (e.g., openings, gaps, channels, etc.) that acoustically communicates with the external environment.

[0087] In some embodiments, when a user wears the open-back acoustic device 10, the open-back acoustic device 10 forms a cavity-like structure 702 with the ear. For example... Figure 3B As shown, the cavity-like structure 702 may include a listening position and at least one sound source 701A. Here, "including" can mean that at least one of the listening position and the sound source 701A is inside the cavity-like structure 702, or that at least one of the listening position and the sound source 701A is at the inner edge of the cavity-like structure 702. The listening position can be equivalent to the ear canal opening 101a, or it can be an acoustic reference point of the ear, such as the ear reference point (ERP), the tympanic membrane reference point (DRP), or an entrance structure guiding the listener. For the wearer of the open acoustic device 10, a leakage structure 703 is formed on the cavity-like structure 702, and sound will leak from the leakage structure to the outside of the cavity-like structure 702. Since the sound source 701A is enclosed by the cavity-like structure 702, most of the sound radiated from it will reach the listening position through direct or reflected sound. Conversely, without the cavity-like structure 702, most of the sound radiated from the sound source 701A will not reach the listening position. Therefore, the cavity-like structure 702 significantly increases the volume of the sound reaching the listening position. The sound source 701A radiates sound to the outside through the leakage structure 703, which is equivalent to generating a secondary sound source 701A' at the leakage structure 703.

[0088] In specific application scenarios, the outer wall surface of the housing 111 of the sound-emitting part 11 is usually flat or curved, while the inner surface of the user's concha 102 has an uneven structure. By extending part or all of the sound-emitting part 11 into the concha 102, a cavity-like structure communicating with the outside is formed between the contours of the sound-emitting part 11 and the concha 102. Because the shapes, sizes, and relative positions of various structures in different users' ears differ, the structure and size of the cavity-like structure 702 formed by different users wearing the open-back acoustic device 10 will also differ. For example, due to differences in the shape and volume of the cavity-like structure 702, the position of the sound source relative to the cavity-like structure will differ, the position of the leakage structure 703 formed on the cavity-like structure 702 will differ, and consequently, the reflection of sound by the cavity-like structure 702 will differ, leading to poor consistency in the listening experience among different users. In the aforementioned cavity-like structure 702, it was found that by adjusting the relative position of the sound source (such as 701A) and the listening position, the cavity-like structure can reflect sound in a similar manner when different users wear the open acoustic device 10.

[0089] Furthermore, due to its open-back design, ambient noise easily enters the ear canal, causing the wearer to simultaneously hear both ambient noise and the sound emitted by the open-back headphones, affecting the listening experience. In some embodiments, the open-back acoustic device includes a microphone for acquiring ambient noise. Based on the signal acquired by the microphone, the open-back acoustic device can play noise-canceling sounds to reduce the impact of ambient noise and improve the consistency of listening experience for different users. With this configuration, the open-back acoustic device 10 is an open-back headphone with active noise cancellation. In some embodiments, the microphone may include a first microphone for acquiring external sound. The open-back acoustic device 10 (e.g., the processing circuitry of the open-back acoustic device 10) can generate a noise-canceling signal based on the electrical signal generated by the first microphone, and thereby drive the speaker assembly 112 to output noise-canceling sounds capable of canceling out the ambient noise. In some embodiments, the sound acquired by the first microphone also includes the user's voice. In some embodiments, the microphone may also include a second microphone located at a different position from the first microphone. In some embodiments, the first microphone and / or the second microphone may be located inside the cavity-like structure 702.

[0090] In the design of the open-back acoustic device 10, the consistency of the listening effect (e.g., listening volume) for different users is one of the key factors that needs to be considered. Due to the differences in the shape, size, and relative position of various structures in different users' ears, the relative position of the sound-emitting part 11 to different users' ears will vary when worn. Even if the sound-emitting part 11 emits the same volume, the users' listening effect (e.g., listening volume) will differ. This problem is undesirable for open-back acoustic devices. In other words, in the design of open-back acoustic devices, it is desirable to minimize the differences in the listening effect heard by different users to improve the consistency of the listening effect, achieve better noise reduction, and thus enhance the stability of the open-back acoustic device 10 in use.

[0091] In some embodiments, algorithmic techniques can be employed to improve the consistency of listening experience among different users of the open-back acoustic device 10. For example, algorithms can be used to adjust the output volume of each frequency band to improve the consistency of listening experience among different users. However, this approach does not significantly improve the consistency of listening experience among different users and is quite complex, requiring sophisticated algorithms and corresponding chips. In other embodiments, an adjustment structure can be provided to make the wearing position of the open-back acoustic device 10 adjustable, thereby improving the consistency of listening experience among different users. Users can adjust the position according to their own needs. This approach requires a detection feedback system to inform the user of the accuracy of the adjustment position. However, this method makes the structure of the open-back acoustic device 10 complex and unstable.

[0092] Based on the cavity-like structure described above, adjusting the relative position of the sound source and the listening position can ensure that different users wearing the open-back acoustic device 10 exhibit similar sound reflection characteristics. Research has found that adjusting the relative position of the sound outlet 113 (corresponding to the sound location) and the ear canal opening 101a (corresponding to the listening position) of the open-back acoustic device 10 allows for full utilization of the sound reflection by the cavity-like structure 702, reducing sound leakage and improving the consistency of listening experience (e.g., listening volume) among different users. Figure 3B The relevant explanation is that, because the sound-producing part 11 and the concha cavity 102 form a cavity-like structure (such as... Figure 3BIn the cavity-like structure 702, the placement of the sound outlet 113 on the sound-emitting part 11 has a significant impact on the consistency of the listening effect (e.g., listening volume) for different users. Furthermore, due to differences in the position, orientation, and size of the ear canal openings of different users, the relative position of the sound outlet 113 on the sound-emitting part 11 and the ear canal opening 101a of different users will vary. This is the main reason for the differences in the listening effect (e.g., volume) heard by different users when wearing the same open-back acoustic device. For example, some users' ear canals may be positioned lower or higher, or have different orientations. This means that even if the sound-emitting part 11 emits the same volume, some users may perceive a volume that is too high or too low, resulting in a poor listening experience for them. Therefore, to improve the consistency of the listening effect (e.g., listening volume) for different users, the relative positional relationship between the sound outlet 113 and the ear canal opening 101a needs to be considered. It should be noted that the ear canal openings of some users are located lower or higher than normal. The different orientations of the ear canal openings may be relative to the average position of the ear canal openings of most users or relative to an ear model with a "standard" shape and size. Unless otherwise specified, the relative positional relationship between the sound outlet 113 and the ear 100 (such as the ear canal opening 101a and the tragus 1010) described later in this specification refers to the relative positional relationship between the sound outlet 113 and the ear 100 in the wearing state.

[0093] There are many parameters relating to the relative positional relationship between the sound outlet 113 and the ear canal opening 101a. Through long-term research, specific parameters significantly related to the user's listening volume have been determined from these parameters. Please refer to... Figures 5A-5GThe specific parameters determined include: the distance L1 between the centroid Q2 of the outer end face 1131 of the sound outlet 113 and the centroid Q1 of the ear canal opening 101a; the closest distance L2 between the centroid Q1 of the ear canal opening 101a and the outer end face 1131 of the sound outlet 113; the length H1 of the perpendicular line from the centroid of the ear canal opening 101a to the plane containing the outer end face of the sound outlet 113; the length H2 of the perpendicular line from the centroid Q2 of the outer end face 1131 of the sound outlet 113 to the plane containing the ear canal opening 101a; the distance L3 between the centroid Q5 of the orthographic projection of the outer end face 1131 of the sound outlet 113 onto the plane containing the ear canal opening 101a and the centroid of the ear canal opening; and the area S2 of the overlapping region R2 of the orthographic projection of the outer end face 1131 of the sound outlet onto the plane containing the closed surface of the concha 102 and the closed surface. After long-term research, it was found that all of these specific parameters show a significant correlation with the listening volume. Furthermore, considering that the area of ​​the sound outlet 113 affects the closest distance L2 between the centroid Q1 of the ear canal opening 101a and the outer end face 1131 of the sound outlet 113, the area of ​​the sound outlet 113 is also considered as a parameter significantly related to the user's listening volume. Additionally, considering that the direction of the outer end face 1131 of the sound outlet 113 affects the direction of sound wave transmission, and that the angle α between the outer end face 1131 of the sound outlet 113 and the plane R1 containing the ear canal opening 101a also affects the user's listening experience, the angle α between the outer end face 1131 of the sound outlet 113 and the plane R1 containing the ear canal opening 101a is also considered as a parameter significantly related to the user's listening volume.

[0094] In further searching for parameters significantly correlated with the consistency of hearing effects among different users, the volume difference between the listening volume of a group of test subjects whose auricle 110 size is approximately normally distributed and the average listening volume can be used as a reference parameter reflecting the consistency of hearing effects among different users. The average listening volume refers to the average listening volume of the corresponding open-back acoustic device. This average listening volume is the simulated listening volume under a specific output by wearing the open-back acoustic device on an ear model with a "standard" shape and size. It can also be the average listening volume reported by multiple test subjects wearing the open-back acoustic device under a specific output. Further research revealed that among the specific parameters relating the relative positional relationship between the sound outlet 113 and the ear canal opening 101a (i.e., distance L1, distance L2, length H1, length H2, distance L3, area S1, area S2, and included angle α), the distance-related features (i.e., distance L1, distance L2, length H1, length H2, and distance L3) are more significantly correlated with the reference parameters. Validated by Pearson correlation analysis, it was also verified that distance-related features (i.e., distance L1, distance L2, length H1, length H2, and distance L3) are more significantly correlated with the reference parameter (i.e., volume difference, reflecting the consistency of listening effects among different users). The meaning and specific values ​​of the aforementioned parameters will be further explained below.

[0095] Based on the foregoing conclusions, the specific settings of the parameters mentioned above (i.e., distance L1, distance L2, length H1, length H2, distance L3, area S1, area S2, and included angle α) can be considered to improve the consistency of the listening effect for different users. Based on the human body structure, the sound outlet 113 is located within the auricle 110, and the sound outlet 113 and the auricle 110 have a relatively definite positional relationship. Therefore, the relative position of the sound outlet 113 and the larger area of ​​the auricle 110 can be considered first. In some embodiments, the sound outlet 113 and the ear 100 (auricle 110) can be projected onto the sagittal plane of the human body (i.e., Figure 4A On the plane formed by the vertical axis T and the sagittal axis S, the positional relationship between the sound hole 113 and the ear 100 (auricle 110) is explained by the projection of the sound hole 113 and the auricle 110 onto the sagittal plane. Figure 4A This is an exemplary wearing diagram of an open-back acoustic device in the sagittal plane, according to some embodiments of this specification. Figure 4B yes Figure 4A An enlarged schematic diagram of the projection of the open acoustic device onto the sagittal plane. Figure 4C yes Figure 4A The enlarged schematic diagram of the ear and the open-back acoustic device shown in the wearing diagram is shown.

[0096] like Figures 4A-4CAs shown, in some embodiments, when a user wears the open-back acoustic device 10, along the coronal axis R, the sound outlet 113 and the auricle 110 have a first projection 113a and a second projection 110a respectively on the sagittal plane of the human body. The centroid O1 of the first projection 113a and the highest point A1 of the second projection 110a have a first distance d1 in the vertical axis T direction of the human body, and the centroid O1 of the first projection 113a and the end point B1 of the second projection 110a have a second distance w1 in the sagittal axis S direction of the human body. The ratio of the first distance d1 to the height h of the second projection 110a in the vertical axis T direction can be between 0.4 and 0.7. The ratio of the second distance w1 to the width w of the second projection 110a in the sagittal axis S direction is between 0.65 and 0.8.

[0097] In some embodiments, the shape of the sound outlet 113 can be a regular or irregular three-dimensional shape, and correspondingly, the first projection 113a of the sound outlet 113 on the sagittal plane can be a regular or irregular shape. Figure 4B The rectangular region indicated by the solid-line frame P is delineated around the projection of the sound outlet 113 onto the sagittal plane (i.e., the first projection 113a), and the centroid of the rectangular region indicated by the solid-line frame P is approximately regarded as the centroid O1 of the first projection 113a. In some embodiments, combined with Figure 4A and Figure 4B Based on the three-dimensional structure of the sound outlet 113, a thickness direction X, a major axis direction Y, and a minor axis direction Z can be introduced, where the major axis direction Y and the minor axis direction Z are perpendicular, and the thickness direction X is perpendicular to the plane formed by the major axis direction Y and the minor axis direction Z. As an example, the confirmation process of the solid line frame P is as follows: Determine the two points of the sound outlet 113 that are farthest apart in the major axis direction Y, and draw a first line segment and a second line segment parallel to the minor axis direction Z through these two points. Determine the two points of the sound outlet 113 that are farthest apart in the minor axis direction Z, and draw a third line segment and a fourth line segment parallel to the major axis direction Y through these two points. The area formed by the above line segments can be used to obtain... Figure 4B The rectangular region of the solid-lined frame P shown.

[0098] It is important to note that the projection of a point located on the user's neck onto the sagittal plane is defined as the first reference point. The highest point A1 of the second projection 110a can be understood as the point with the largest distance relative to the first reference point along the vertical axis T among all its projection points. In other words, the projection of the highest point of the auricle 110 pointing towards the top of the head along the vertical axis T onto the sagittal plane is the highest point A1 of the second projection 110a. Compared to the highest point A1 of the second projection 110a, the lowest point A2 of the second projection 110a can be understood as the point with the smallest distance relative to the first reference point along the vertical axis T among all its projection points. In other words, the projection of the lowest point of the auricle 110 away from the top of the head along the vertical axis T onto the sagittal plane is the lowest point A2 of the second projection 110a. The height h of the second projection 110a in the vertical axis T direction is the distance between the point with the largest distance relative to the first reference point and the point with the smallest distance in the vertical axis T direction among all projection points in the second projection 110a. That is, the height h of the second projection 110a in the vertical axis T direction is the distance between the highest point A1 and the lowest point A2 in the vertical axis T direction.

[0099] It is important to note that the projection of a point located at the tip of the user's nose onto the sagittal plane is defined as the second reference point. The terminal point B1 of the second projection 110a can be understood as the point with the largest distance relative to the second reference point in the sagittal axis S direction among all its projection points. In other words, the projection of the terminal point of the auricle 110 pointing towards the back of the head along the sagittal axis S onto the sagittal plane is the terminal point B1 of the second projection 110a. Compared to the terminal point B1 of the second projection 110a, the anterior point B2 of the second projection 110a can be understood as the point with the smallest distance relative to the second reference point in the sagittal axis S direction among all its projection points. In other words, the projection of the anterior point of the auricle 110 away from the back of the head along the sagittal axis S onto the sagittal plane is the anterior point B2 of the second projection 110a. The width w of the second projection 110a in the sagittal axis direction is the distance between the point with the largest distance relative to the second reference point and the point with the smallest distance in the sagittal axis S direction among all projection points in the second projection 110a. The width w of the second projection 110a in the sagittal axis direction is the distance between the end point B1 and the front point B2 in the sagittal axis S direction.

[0100] It should be noted that the projections of structures such as the sound hole 113 or the auricle 110 on the sagittal plane in the embodiments of this specification refer to the projections on the sagittal plane along the coronal axis R direction, and will not be emphasized again in the following text of the specification.

[0101] Based on the above, for the open-back acoustic device 10, due to differences in the shape, size, and relative position of various structures in different users' ears, the listening effect (e.g., listening volume) varies significantly when different users wear the same open-back acoustic device. For example, in Figure 3BIn the cavity-like structure, ensuring that the sound sources corresponding to the sound outlet 113 are all located within the cavity-like structure can improve the user's hearing volume at the ear canal opening. By setting the ratio of the first distance d1 to the height h of the second projection 110a in the vertical axis T direction and the ratio of the second distance w1 to the width w of the second projection 110a in the sagittal axis S direction as described above, it can be ensured that the sound outlet 113 can be located in the area corresponding to the concha 102 when different users wear the open acoustic device 10, thereby ensuring a high consistency in the listening effect (e.g., hearing volume) of different users wearing the open acoustic device 10.

[0102] Specifically, when the user wears the open-back acoustic device 10, the ratio of the first distance d1 to the height h is between 0.4 and 0.7, and the ratio of the second distance w1 to the width w is between 0.65 and 0.8. This ensures that the relative positions of the sound outlet 113 and the auricle 110 in the vertical axis T and the sagittal axis S are suitable. In other words, in the standard model, the relative positions of the sound outlet 113 and the ear canal opening 101a in the vertical axis T and the sagittal axis S are sufficiently close, while ensuring that the sound outlet 113 is located in the area corresponding to the concha 102 (i.e., the area inside the concha 102 or the area outside the concha 102 but directly opposite it). Therefore, when the open acoustic device 10 is worn on the user's ear, the sound outlet 113 and the ear canal opening 101a are in such a relative position range that the user's listening effect (hearing volume) can be better without further setting an adjustment structure, and the listening effect (e.g., hearing volume) of different users wearing the open acoustic device 10 is more consistent.

[0103] When worn, if the ratio of the first distance d1 to the height h is too small or too large, the sound outlet 113 may be located in the area directly opposite the helix 105 or the area directly opposite the earlobe 108, which may result in the sound outlet 113 being far from the ear canal opening 101a, affecting the user's listening effect. In order to ensure that the user has a good listening effect (e.g., a larger listening volume) and that the listening effect (e.g., listening volume) of different users wearing the open acoustic device 10 is consistent without blocking the user's ear canal opening 101a, preferably, the ratio of the first distance d1 between the centroid O1 of the first projection 113a and the highest point A1 of the second projection 110a in the vertical axis T direction to the height h of the second projection 110a in the vertical axis T direction is controlled between 0.45 and 0.6. In the standard model, when the open-back acoustic device 10 is worn on the user's ear, the sound outlet 113 is positioned more appropriately relative to the ear canal opening 101a (e.g., the sound outlet 113 is close enough to the ear canal opening 101a and is located within the concha 102). This eliminates the need for further adjustment structures, resulting in higher consistency in the listening experience for different users. More preferably, the ratio of the first distance d1 between the centroid O1 of the first projection 113a and the highest point A1 of the second projection 110a along the vertical axis T to the height h of the second projection 110a along the vertical axis T is controlled between 0.47 and 0.58.

[0104] Similarly, when worn, if the ratio of the second distance w1 to the width w is too large or too small, the sound outlet 113 may be located in the area directly opposite the tragus 1010 or the area directly opposite the helix 107, which will also cause the sound outlet 113 to be far from the ear canal opening, affecting the user's listening effect. In order to ensure that the user has a good listening effect (e.g., a larger listening volume) and high consistency of the listening effect (e.g., listening volume) of different users wearing the open acoustic device 10 without blocking the user's ear canal opening 101a, preferably, the ratio of the second distance w1 between the centroid O1 of the first projection 113a and the end point B1 of the second projection 110a in the sagittal axis S direction to the width w of the second projection 110a in the sagittal axis S direction is controlled between 0.68 and 0.75. In the standard model, when the open-back acoustic device 10 is worn on the user's ear, the sound outlet 113 is positioned more appropriately relative to the ear canal opening 101a (e.g., the sound outlet 113 is close enough to the ear canal opening 101a and the sound outlet 113 is located within the concha 102). This allows for a larger sound volume at the ear canal opening 101a without the need for further adjustment structures. More preferably, the ratio of the second distance w1 between the centroid O1 of the first projection 113a and the end point B1 of the second projection 110a in the sagittal axis S direction to the width w of the second projection 110a in the sagittal axis S direction is controlled between 0.69 and 0.74.

[0105] In some embodiments, to ensure that users have a better listening experience (e.g., a larger listening volume) and that the listening experience (e.g., listening volume) is more consistent among different users wearing the open acoustic device 10, the first distance d1 can be 25mm-38mm. More preferably, the first distance d1 can be 28mm-36mm.

[0106] In some embodiments, to ensure that users have a better listening experience (e.g., a larger listening volume) and that the listening experience (e.g., listening volume) is more consistent among different users wearing the open acoustic device 10, the second distance w1 can be 27mm-31mm. More preferably, the second distance w1 can be 28mm-30mm.

[0107] As a specific example, the height h of the second projection 110a in the vertical axis T direction can be 60mm-63mm. When worn, if the first distance d1 between the centroid O1 of the first projection 113a and the highest point A1 of the second projection 110a in the vertical axis T direction is less than 24mm or greater than 45mm, the sound outlet 113 will be too high or too low relative to the ear canal opening 101a. Therefore, to ensure a better listening experience for the user (e.g., a higher listening volume) and greater consistency in the listening experience (e.g., listening volume) among different users wearing the open-back acoustic device 10, the first distance d1 between the centroid O1 of the first projection 113a and the highest point A1 of the second projection 110a in the vertical axis T direction can be controlled between 25mm and 38mm. Similarly, in some embodiments, the width of the second projection 110a in the sagittal axis S direction can be 38mm-42mm. When the projection of the centroid O1 of the first projection 113a in the sagittal plane and the second distance w1 between the end point B1 of the second projection 110a and the end point B1 in the sagittal axis S direction are less than 27mm or greater than 31mm, the sound outlet 113 will be too far forward or too far backward relative to the ear canal opening 101a. Therefore, in order to ensure that the user has a better listening effect (e.g., a larger listening volume) and that the listening effect (e.g., listening volume) of different users wearing the open acoustic device 10 is highly consistent, the second distance w1 between the centroid O1 of the first projection 113a and the end point B1 of the second projection 110a in the sagittal axis S direction can be controlled between 27mm and 31mm.

[0108] Figure 4D This is an exemplary wearing diagram of an open-back acoustic device shown in some embodiments of this specification on the coronal plane. Figure 4E This is a schematic diagram of the sound outlet and auricle in the coronal plane of an open acoustic device according to some embodiments of this specification. For example... Figure 4D and Figure 4E As shown ( Figure 4DThe dashed lines in the diagram indicate the coronal plane. In some embodiments, the sound outlet 113 and the auricle 110 have a third projection 113b and a fourth projection 110b, respectively, on the coronal plane of the human body. The centroid O2 of the third projection 113b and the outer endpoint B3 of the fourth projection 110b have a third distance l1 in the direction of the coronal axis R of the human body. Optionally, the ratio of the third distance l1 to the length l of the fourth projection 110b in the direction of the coronal axis R is between 0.8 and 1.4. Preferably, the ratio of the third distance l1 to the length l of the fourth projection 110b in the direction of the coronal axis R is between 0.9 and 1.2.

[0109] In some embodiments, the shape of the sound outlet 113 can be a regular or irregular three-dimensional shape, and correspondingly, the first projection 113a of the sound outlet 113 on the coronal plane can be a regular or irregular shape. Figure 4F The rectangular region indicated by the solid-line frame T is delineated around the projection of the sound outlet 113 onto the coronal plane (i.e., the third projection 113b), and the centroid of the rectangular region indicated by the solid-line frame T is approximately regarded as the centroid O2 of the first projection 113b. In some embodiments, combined with Figures 4D-4F Based on the three-dimensional structure of the sound outlet 113, a thickness direction X, a major axis direction Y, and a minor axis direction Z can be introduced, where the thickness direction X and the minor axis direction Z are perpendicular, and the major axis direction Y is perpendicular to the plane formed by the thickness direction X and the minor axis direction Z. As an example, the confirmation process of the solid line frame T is as follows: Determine the two points of the sound outlet 113 that are farthest apart in the thickness direction X, and draw a first line segment and a second line segment parallel to the minor axis direction Z through these two points. Determine the two points of the sound outlet 113 that are farthest apart in the minor axis direction Z, and draw a third line segment and a fourth line segment parallel to the thickness direction X through these two points. The area formed by the above line segments can be used to obtain... Figure 4F The rectangular area within the solid-line frame T shown.

[0110] It is important to note that the projection of a point on the user's face onto the coronal plane is defined as the third reference point. The outer endpoint B3 of the fourth projection 110b can be understood as the point with the greatest distance from the third reference point relative to the third reference point among all projection points of the auricle 110 in the coronal axis R direction. In other words, the projection of the outer endpoint of the auricle 110 pointing towards the side of the body along the coronal axis onto the coronal plane is the outer endpoint B3 of the fourth projection 110b. Compared to the outer endpoint B3 of the fourth projection 110b, the inner endpoint of the fourth projection 110b can be understood as the point on the projection of the line connecting the auricle 110 and the face onto the coronal plane (such as the upper endpoint of the line connecting the auricle 110 and the face onto the coronal plane). That is, the projection of the inner endpoint of the auricle 110 pointing towards the side of the body along the coronal axis (the upper endpoint of the line connecting the auricle 110 and the face) onto the coronal plane is the inner endpoint B4 of the fourth projection 110b. The length l of the fourth projection 110b in the direction of the coronal axis R is the projection point that is farthest from the projection line in the direction of the coronal axis R among all projection points in the fourth projection 110b. The projection line is the projection of the line connecting the face and the auricle 110 on the coronal plane. That is, the length l of the fourth projection 110b in the direction of the coronal axis R is the distance between points B3 and B4 in the direction of the coronal axis R.

[0111] In addition, in the embodiments of this specification, the projection of structures such as the sound hole 113 or the auricle 110 onto the coronal plane refers to the projection onto the coronal plane along the sagittal axis S, and will not be emphasized again in the following text of the specification.

[0112] Specifically, when the ratio of the third distance l1 between the centroid O2 of the third projection 113b and the outer endpoint B3 of the fourth projection 110b in the coronal axis R direction to the length l of the fourth projection 110b in the coronal axis R direction is between 0.8 and 1.4, the relative positions of the sound outlet 113 and the auricle 110 in the coronal axis R direction are suitable. In the standard model, the relative positions of the sound outlet 113 and the ear canal opening 101a in the coronal axis R direction are made sufficiently close, while ensuring that the sound outlet 113 can extend into the concha cavity 102. Therefore, when the open acoustic device 10 is worn on the user's ear, the sound outlet 113 and the ear canal opening 101a are within such a relative position range, and no further adjustment structure is needed to ensure that the user's hearing effect is good (e.g., the volume is loud), and the consistency of the hearing effect (e.g., the volume) of different users wearing the open acoustic device 10 is high.

[0113] When the sound outlet 113 is worn, if the ratio of the centroid O2 of the projection of the sound outlet 113 in the coronal plane (third projection 113b) to the projection of the outer end of the auricle 110 in the coronal plane (outer end point B3 of the fourth projection 110b) in the coronal plane in the direction of the coronal axis R is too small or too large, the sound outlet 113 may be located too far from the concha cavity 102, resulting in the sound outlet 113 being far from the ear canal opening 101a, affecting the user's hearing volume at the ear canal opening, or causing the sound-emitting part 11 to block the ear canal opening 101a, thus failing to achieve the purpose of "liberating" the external auditory canal 101. To ensure a good listening experience (e.g., higher volume) for the user without blocking the ear canal opening 110a, and to maintain high consistency in the listening experience (e.g., volume) among different users wearing the open acoustic device 10, preferably, the ratio of the third distance l1 between the centroid O2 of the third projection and the outer endpoint of the fourth projection along the coronal axis of the human body to the length l of the fourth projection along the coronal axis is controlled between 0.9 and 1.3. This allows the sound outlet 113 to be located in a more suitable position (e.g., the sound outlet 113 is close enough to the ear canal opening 101a and is located within the concha 102), resulting in a higher sound intensity at the ear canal opening. More preferably, the ratio of the third distance l1 between the centroid O2 of the third projection 103b and the outer endpoint B3 of the fourth projection 110b along the coronal axis R of the human body to the length l of the fourth projection 110b along the coronal axis R is controlled between 0.95 and 1.26.

[0114] In some embodiments, to ensure that users have a better listening experience (e.g., a larger listening volume) and that the listening experience (e.g., listening volume) is more consistent among different users wearing the open acoustic device 10, the third distance l1 can be 14mm-23mm. More preferably, the third distance l1 can be 16mm-22mm.

[0115] As a specific example, the length l of the second projection 110a in the coronal axis R direction can be 16mm-18mm. When worn, if the third distance l1 between the centroid O2 of the third projection 113b and the outer endpoint B3 of the fourth projection 110b in the coronal axis R direction is less than 14mm or greater than 23mm, the sound outlet 113 will be too far outward or too far inward relative to the ear canal opening 101a. Therefore, to ensure that the sound-emitting part 11 does not block the ear canal opening 101a, to ensure that the user has a good listening effect (e.g., a larger listening volume), and to ensure high consistency in the listening effect (e.g., listening volume) of different users wearing the open acoustic device 10, the third distance l1 between the centroid O2 of the third projection 113b and the outer endpoint B3 of the fourth projection 110b in the coronal axis R direction can be controlled between 14mm and 23mm.

[0116] The following section provides further explanation of the specific values ​​for distances L1, L2, and L3, which are more relevant to the consistency of the user's listening experience:

[0117] In some embodiments, such as Figure 5A As shown, the distance L1 between the centroid Q2 of the outer end face 1131 of the sound outlet 113 and the centroid Q1 of the ear canal opening 101a can range from 5mm to 13mm. For further explanation regarding the centroid Q2 of the outer end face 1131 of the sound outlet 113 and the centroid Q1 of the ear canal opening 101a, please refer to the above text (e.g.). Figure 1B and Figure 2A (See the relevant description in the text). With this configuration, in the standard model, the relative distance between the sound hole 113 and the ear canal opening 101a can be within a suitable range. Therefore, when the open-back acoustic device 10 is worn on a user's ear, it provides a better listening experience (higher volume), and the listening experience (e.g., volume) is highly consistent among different users wearing the open-back acoustic device 10. Specifically, this configuration ensures that the sound hole 113 is sufficiently close to the ear canal opening 101a while maintaining that the sound hole 113 is located within the concha cavity 102. More preferably, the distance L1 between the centroid of the outer end face of the sound hole 113 and the centroid of the ear canal opening 101a can range from 6mm to 12mm.

[0118] In some embodiments, such as Figure 5B As shown, the closest distance L2 between the centroid Q1 of the ear canal opening 101a and the outer end face 1131 of the sound outlet 113 can be 8mm-13mm. The closest distance between the centroid Q1 of the ear canal opening 101a and the outer end face 1131 of the sound outlet 113 is the minimum distance from the centroid Q1 of the ear canal opening 101a to the edge of the outer end face 1131 of the sound outlet 113. With this setting, in the standard model, the distance between the centroid Q1 of the ear canal opening 101a and the sound outlet 113 is appropriate. This avoids the sound-emitting part 11 blocking the ear canal opening when the open-back acoustic device 10 is worn on the user's ear, as the centroid Q1 of the ear canal opening 101a is too close to the sound outlet 113. It also avoids the user's poor listening experience (too low volume) due to the centroid Q1 of the ear canal opening 101a being too far from the sound outlet 113. Furthermore, it maximizes the consistency of the listening experience (e.g., volume) for different users wearing the open-back acoustic device 10. More preferably, the closest distance L2 between the centroid Q1 of the ear canal opening 101a and the outer end face of the sound outlet 113 can be in the range of 10mm-11mm. In this specification, the minimum distance (or closest distance) between a point (e.g., centroid) and a planar region (e.g., projection, outer end face) can be understood as the length of the shortest line among all lines connecting the point to any position within the corresponding planar region.

[0119] In other embodiments, since determining the centroid Q2 of the outer end face 1131 of the sound outlet 113 and the centroid Q1 of the ear canal opening 101a is quite complex, the centroid O1 of the first projection 113a of the sound outlet 113 on the sagittal plane can replace the centroid Q2 of the outer end face of the sound outlet 113, and the centroid Q1 of the projection of the ear canal opening 101a on the sagittal plane can be replaced. That is, the distance L1 can be replaced by the distance between the centroid O1 of the first projection 113a and the centroid of the projection of the ear canal opening 101a on the sagittal plane, thus simplifying the measurement of L1. Similarly, the minimum distance between the centroid of the projection of the ear canal opening on the sagittal plane and the first projection 113a can be replaced by the distance L2, thus simplifying the measurement of L2.

[0120] In some embodiments, the distance between the centroid of the first projection 113a and the centroid of the projection of the ear canal opening 101a in the sagittal plane can be in the range of 2mm-10mm. The distance between the centroid O1 of the first projection 113a and the centroid of the projection of the ear canal opening 101a in the sagittal plane defines the relative position of the sound outlet 113 with respect to the ear canal opening 101a in the anterior-posterior direction (sagittal axis S direction) of the human body. By limiting the distance range, it can be ensured that the position of the sound outlet 113 with respect to the ear canal opening 101a in the standard model is within a certain range in the anterior-posterior direction (sagittal axis S direction) of the human body. The sound outlet 113 can be better aligned with the ear canal opening 101a. When the open acoustic device 10 is worn on the user's ear, the user's hearing effect is better (the hearing volume is larger), and the consistency of the hearing effect (e.g., the hearing volume) of different users wearing the open acoustic device 10 is high. More preferably, the distance between the centroid O1 of the first projection 113a and the centroid of the projection of the ear canal opening 101a on the sagittal plane can be in the range of 3.5mm-8.5mm.

[0121] Similarly, in some embodiments, to avoid the shell blocking the ear canal opening and to ensure that the user has a good listening experience (e.g., a large listening volume), as well as high consistency in the listening experience (e.g., listening volume) of different users wearing the open acoustic device 10, the minimum distance between the centroid of the projection of the ear canal opening 101a in the sagittal plane and the first projection 113a can be in the range of 1mm-10mm. More preferably, the minimum distance between the centroid of the projection of the ear canal opening 101a in the sagittal plane and the first projection 113a can be in the range of 2mm-7mm.

[0122] In some embodiments, the closest distance L2 between the centroid of the ear canal opening 101a and the outer end face of the sound outlet 113 can be achieved by changing the area of ​​the sound outlet 113 (i.e., the area S1 mentioned above). For example, the consistency of the listening effect for different users can be improved by increasing the area of ​​the sound outlet 113. It should be noted that the area of ​​the sound outlet 113 can be understood as the effective opening area of ​​the sound outlet 113. For example, the opening area at different positions along the axial direction of the sound outlet 113 may be different, and the effective opening area is the minimum value among the opening areas at different positions along the axial direction of the sound outlet 113. In some embodiments, the area S1 of the sound outlet 113 can be 10 mm. 2 -60mm 2 On the one hand, since the area of ​​the sound outlet 113 directly affects the volume of the sound emitted by the sound outlet 113, by setting the area S1 of the sound outlet 113 within the aforementioned range, the size of the sound outlet 113 can be set so that the size of the housing 111 is not excessively increased, while still having a large volume output. On the other hand, since the area of ​​the sound outlet 113 affects the closest distance L2 between the centroid Q1 of the ear canal opening 101a and the sound outlet 113, by setting the area S1 of the sound outlet 113 within the aforementioned range, it can be ensured that the closest distance between the centroid Q1 of the ear canal opening 101a and the outer end face 1131 of the sound outlet 113 can be set within the range described above, resulting in a better listening effect (larger listening volume) for the user, and a higher consistency in the listening effect (e.g., listening volume) for different users wearing the open acoustic device 10. More preferably, the area S1 of the sound outlet 113 can be 20 mm. 2 -55mm 2 .

[0123] By combining the distance L2 between the centroid Q1 of the ear canal opening 101a and the nearest point of the sound outlet 113, and the area of ​​the sound outlet 113, the extent to which the sound outlet 113 covers the ear canal opening 101a can be determined. By setting the distance L2 between the centroid Q1 of the ear canal opening 101a and the nearest point of the sound outlet 113 to be 8mm-13mm, and setting the area of ​​the sound outlet 113 to be within a range of 10mm... 2 -60mm 2 This ensures that the sound outlet 113 covers a large area of ​​the ear canal opening 101a, thereby reducing sound leakage, ensuring a better listening experience for the user, and ensuring a high degree of consistency in the listening experience for different users wearing the acoustic device 10.

[0124] In some embodiments, since determining the centroid Q2 of the outer end face 1131 of the sound outlet 113 and the centroid Q1 of the ear canal opening 101a is quite complex, the centroid Q2 of the outer end face 1131 of the sound outlet 113 can be replaced by the centroid O2 of the third projection 113b of the sound outlet 113 on the coronal plane of the human body, and the centroid Q1 of the projection of the ear canal opening 101a on the coronal plane can be replaced by the centroid of the projection of the ear canal opening 101a on the coronal plane. That is, the distance L1 can be replaced by the distance between the centroid O2 of the third projection 113b and the centroid of the projection of the ear canal opening 101a on the coronal plane, which can also simplify the measurement method of L1. Similarly, the distance L2 can be replaced by the minimum distance between the centroid of the projection of the ear canal opening 101a on the coronal plane and the fourth projection 110b, which can also simplify the measurement method of L2.

[0125] In some embodiments, the distance between the centroid O2 of the third projection 113b and the centroid of the projection of the ear canal opening 101a onto the coronal plane can be in the range of 4mm-12mm. The distance between the centroid O2 of the third projection 113b and the centroid of the projection of the ear canal opening 101a onto the coronal plane defines the relative position of the sound outlet 113 relative to the ear canal opening 101a in the left-right direction (coronal axis R direction) of the human body. By limiting the distance range, it can be ensured that the position of the sound outlet 113 relative to the ear canal opening 101a in the standard model is within a certain range in the left-right direction (coronal axis direction) of the human body. When the open acoustic device 10 is worn on the user's ear, the sound outlet 113 is closer to the ear canal opening 101a, but the shell 111 does not block the ear canal opening 101a, so that the user's hearing effect is better (hearing volume is larger), and the consistency of the hearing effect (e.g., hearing volume) of different users wearing the acoustic device 10 is high. More preferably, the distance between the centroid O2 of the third projection 113b and the centroid of the projection of the ear canal opening 101a on the coronal plane can be in the range of 5mm-10mm.

[0126] In some embodiments, the minimum distance between the centroid of the projection of the ear canal opening 101a onto the coronal plane and the third projection 113b can be in the range of 7mm-10mm. With this configuration, when the open-back acoustic device 10 is worn on the user's ear, it prevents the centroid Q1 of the ear canal opening 101a from being too close to the sound outlet 113, thus avoiding the shell 111 blocking the ear canal opening 101a, and also prevents the centroid Q1 of the ear canal opening 101a from being too far from the sound outlet 113, thus avoiding the user's hearing volume being too low, and ensuring a high degree of consistency in the hearing effect (e.g., hearing volume) for different users wearing the acoustic device 10. More preferably, the minimum distance between the centroid of the projection of the ear canal opening 101a onto the coronal plane and the third projection 113b can be in the range of 8.5mm-10mm.

[0127] In some embodiments, such as Figure 5CAs shown, in order to ensure a better listening experience (higher volume) for the user when the open-back acoustic device 10 is worn on their ear, and to ensure high consistency in the listening experience (e.g., volume) among different users wearing the open-back acoustic device 10, the distance L3 between the centroid Q2 of the outer end face 1131 of the sound outlet 113 and the centroid Q1 of the ear canal opening 101a can be in the range of 0.2mm-8mm. The distance between the centroid Q2 of the outer end face 1131 of the sound outlet 113 and the centroid Q1 of the ear canal opening 101a reflects the relative distance between the ear canal opening 101a and the sound outlet 113 from another perspective, and can also reflect the extent to which the sound outlet 113 covers the ear canal opening 101a. More preferably, the distance L3 between the centroid Q2 of the outer end face 1131 of the sound outlet 113 and the centroid Q1 of the ear canal opening 101a is in the range of 0.3mm-7mm.

[0128] The above text mentions numerous specific parameters (i.e., distance L1, distance L2, length H1, length H2, distance L3, area S1, area S2, and included angle α) relating the relative positions of the sound outlet 113 and the ear canal opening 101a. However, in reality, different parameters may have interrelationships, and different parameters have varying degrees of impact on the consistency of listening effects among different users. After long-term research and practice, the inventors discovered that adjusting the distance L3 significantly affects the consistency of listening effects among different users. The distance L3, the closest distance between the centroid of the ear canal opening 101a and the sound outlet, is the key parameter affecting the consistency of listening effects among different users. Furthermore, stepwise regression analysis can be used to verify the above conclusions.

[0129] In some embodiments, parameters relating to the relative positions of the sound outlet 113 and the ear canal opening 101a can be introduced one by one into the stepwise regression model. After introducing a parameter, it is checked whether the introduction causes a significant change in the stepwise regression model, and parameters that do not cause a significant change in the stepwise regression model are removed. Stepwise regression analysis revealed that the introduction of distances L2 and L3 can cause a significant change in the stepwise regression model, and distances L2 and L3 cause significant changes in the stepwise regression model from different perspectives (i.e., distances L2 and L3 do not have a mutual influence relationship). This is consistent with... Figures 6A-6H The scatter plots yielded largely consistent verification conclusions (both indicating significant effects of distances L2 and L3). Furthermore, the contribution of distance L3 was greater than that of distance L2. Therefore, the conclusion that "the distance L3, the closest distance between the centroid of the ear canal opening 101a and the sound outlet, is a key parameter affecting the consistency of listening effects for different users" can be verified. Thus, improving the consistency of listening effects for different users based on the setting of distance L3 is of great significance.

[0130] In some embodiments, the structural design of the open acoustic device (e.g., the shape of the wearing structure, the shape and size of the sound-emitting part, the position and shape of the sound outlet on the sound-emitting part) can be made such that the distance between the sound outlet and the ear canal opening is close enough and also blocked, thereby ensuring the consistency of these key parameters when worn by different users, so as to improve the consistency of the listening effect of different users.

[0131] Based on the aforementioned conclusions, in addition to L1, distance L2, and distance L3, other specific parameters (such as length H1, length H2, area S1, area S2, and angle α) are also significantly related to the user's listening experience (such as listening volume). By setting specific values ​​for these parameters, the user's (at least most users') listening experience can be improved (e.g., by increasing the listening volume).

[0132] The length H1 of the perpendicular line from the centroid Q1 of the ear canal opening 101a to the plane containing the outer end face 1131 of the sound outlet 113 reflects the relative distance between the ear canal opening 101a and the sound outlet 113 from another perspective. In some embodiments, such as Figure 5D As shown, in order to make the user's hearing effect better (hearing volume louder) when the open acoustic device 10 is worn on the user's ear, the length H1 of the perpendicular line from the centroid Q1 of the ear canal opening 101a to the outer end face 1131 of the sound outlet 113 can be in the range of 7mm-13mm. Figure 5D In this context, the length H1 of the perpendicular line is the distance from the centroid Q1 of the ear canal opening 101a to the foot point Q3 of the perpendicular line from the outer end face 1131 of the sound outlet 113. More preferably, the length H1 of the perpendicular line from the centroid Q1 of the ear canal opening 101a to the outer end face 1131 of the sound outlet 113 can be in the range of 9mm-11mm.

[0133] The length of the perpendicular line from the centroid Q2 of the outer end face 1131 of the sound outlet 113 to the plane containing the ear canal opening 101a reflects the relative distance between the ear canal opening 101a and the sound outlet 113 from another perspective. In some embodiments, such as Figure 5E As shown, in order to make the user's hearing effect better (hearing volume louder) when the open acoustic device 10 is worn on the user's ear, the length H2 of the perpendicular line from the centroid Q2 of the outer end face 1131 of the sound outlet 113 to the plane where the ear canal opening 101a is located can be in the range of 2mm-12mm. Figure 5E In this context, the length H2 of the perpendicular line is the distance from the centroid Q2 of the outer end face 1131 of the sound outlet 113 to the foot point Q4 of the perpendicular line to the plane containing the ear canal opening 101a. More preferably, the length H2 of the perpendicular line from the centroid of the sound outlet to the plane containing the ear canal opening 101a can be in the range of 4mm-10mm.

[0134] In some embodiments, such as Figure 5F and Figure 5H As shown, when the outer end face 1131 of the sound outlet 113 is further away from the ear canal opening 101a relative to the tragus 1010 and the helix foot 109, the area of ​​the overlapping region R2 between the orthographic projection of the outer end face 1131 of the sound outlet 1131 on the plane containing the closed surface of the ear 100 and the closed surface is 10 mm. 2 -120mm 2 .like Figure 5H As shown by the dashed box, the aforementioned enclosed surface is the cross-section with the largest area among the cross-sections parallel to the ear canal opening 101a within the space enclosed by the concha 102, tragus 1010, and crus of helix 109. The fact that the outer end face 1131 of the sound outlet 113 is farther from the ear canal opening 101a relative to the tragus 1010 and crus of helix 109 can be understood as follows: the distance from the centroid Q1 of the ear canal opening 101a to the farthest point of the sound outlet 113 in the coronal axis direction (the point farthest from the face) is greater than the distance from the centroid Q1 of the ear canal opening 101a to the farthest point of the tragus in the coronal axis direction (the point farthest from the face). The space enclosed by the concha 102, tragus 1010, and crus of helix 109 can be understood as the space enclosed by the area between the inner edge of the tragus (the edge facing the helix 107) and the inner edge of the crus of helix 109, and the inner surface of the concha 102. In other words, the plane containing the ear canal opening 101a can be moved away from the external auditory canal 101 in a direction perpendicular to the plane containing the ear canal opening 101a. The concha 102, tragus 1010, and crus of helix 109 form a closed cross section on this moving plane (the plane containing the ear canal opening 101a). The closed cross section with the largest area formed during the movement of this plane (the plane containing the ear canal opening 101a) is the aforementioned closed surface. The area S2 of the overlapping region R2 can reflect the situation of sound emitted from the sound hole 113 entering the ear canal opening 101a. Understandably, when the outer end face 1131 of the sound hole 113 is farther away from the ear canal opening 101a relative to the tragus 1010 and crus of helix 109, the tragus 101a and crus of helix 109 may obstruct the sound emitted from the sound hole 113. If the area S2 of the aforementioned overlapping region is too small, most of the sound will be difficult to enter the ear canal opening 101a (resulting in significant sound leakage), and the user's listening experience will be poor. Preferably, when the outer end face 1131 of the sound outlet 113 is further away from the ear canal opening 101a relative to the tragus 1010 and the helix foot 109, the area of ​​the overlapping region between the orthographic projection of the outer end face 1131 of the sound outlet 1131 on the plane containing the closed surface of the concha cavity 102 and the closed surface is 20 mm. 2 -115mm 2 In some embodiments, the ratio of area S2 to area S1 (the area of ​​the sound outlet 113) can be greater than 0.5 to ensure the user's listening experience.

[0135] The orientation of the outer end face 1131 of the sound outlet 113 affects the direction of sound wave transmission; therefore, the angle α between the outer end face 1131 of the sound outlet 113 and the plane R1 containing the ear canal opening 101a will affect the user's listening experience. In some embodiments, such as Figure 5G As shown, in order to improve the user's listening experience (increase the volume), the angle α between the outer end face 1131 of the sound outlet 113 and the plane containing the ear canal opening 101a can be 0°-10°. More preferably, the angle α between the outer end face 1131 of the sound outlet 113 and the plane R1 containing the ear canal opening 101a can be 0°-5°.

[0136] In some embodiments, the correlation between the specific parameters relating to the relative positional relationship between the sound outlet 113 and the ear canal opening 101a and the consistency of the listening effect among different users can also be verified in another way. Specifically, by having multiple different users (also called testers) wear acoustic models, the different values ​​corresponding to each parameter of the setting position of the sound outlet 113 relative to the ear 100 can be obtained, and the playback volume of the open acoustic device can be controlled to be consistent. Then, the listening feedback results (listening volume) of each tester can be used to reflect the listening effect of the tester under the different values ​​corresponding to each parameter. In the process of obtaining the relative positional relationship parameters between the sound outlet 113 and the ear canal opening 101a, since the outer end face 1131 of the sound outlet 113 and the ear canal opening 101a are located on the inner side blocked by the open acoustic device, a three-dimensional scanning and remodeling method is used. A 3D scanner was used to perform 3D scans of the test subjects' ears, creating a "hollow ear model" without the open-back acoustic device, a "wearing model" with the open-back acoustic device, and a "device model" with the open-back acoustic device. By spatially aligning these three models, a 3D model of the wearing state of the sound outlet 113 and the ear (such as the ear canal opening 101a) can be obtained, allowing for analysis of their positional relationship. For example, in Figures 5A-5G Each figure shows the outer end face 1131 of the sound outlet 113 of different models of open-back acoustic devices worn in different positions on the ear of the same test subject. For example, in... Figure 7AThe diagram illustrates the outer end face 1131 of the sound outlet 113 of the same open acoustic device 10 worn at different positions on the ears of different test subjects (see the description below for details). Each rectangle represents the position of the ear canal opening 101a of the corresponding test subject when wearing the open acoustic device 10, thus determining the positional relationship between the sound outlet 113 and the ears 100 of each test subject. When measuring the parameters of the relative positional relationship between the sound outlet 113 and the ears 100, three-dimensional modeling software (e.g., SolidWorks, ProE, Rhino, etc.) can be used to superimpose the "wearing models" corresponding to different test subjects to obtain corresponding three-dimensional models. Points are then selected in the three-dimensional model, and parameters such as the distance between points and the area of ​​each part are measured.

[0137] Then, using the specific parameters (i.e., distance L1, distance L2, length H1, length H2, distance L3, area S1, area S2, and angle α) of the relative positional relationship between the sound outlet 113 and the ear canal opening 101a mentioned above as independent variables on different coordinate axes, and the volume difference between the tester and the average listening volume as the dependent variable, a coordinate graph can be established. For the same independent variable, the coordinate points corresponding to the test results of each tester are placed on the same coordinate graph to form a scatter plot showing the listening volume of each tester under the same independent variable, such as... Figures 6A-6H As shown. Figure 6A The x-coordinate is the distance L1 of the independent variable (see details). Figure 5A The vertical axis represents the volume difference between the tester and the average listening volume. Figure 6B The x-coordinate is the distance L2 of the independent variable (see details). Figure 5B The vertical axis represents the volume difference between the tester and the average listening volume. Figure 6C The x-coordinate is the distance L3 of the independent variable (see details). Figure 5C The vertical axis represents the volume difference between the tester and the average listening volume. Figure 6D The x-axis represents the distance H1 of the independent variable (see details). Figure 5D The vertical axis represents the volume difference between the tester and the average listening volume. Figure 6E The x-axis represents the distance H2 of the independent variable (see details). Figure 5E The vertical axis represents the volume difference between the tester and the average listening volume. Figure 6F The horizontal axis represents the area S1 of the independent variable, and the vertical axis represents the volume difference between the tester and the average listening volume. Figure 6G The x-axis represents the area S2 of the independent variable (see details). Figure 5F The vertical axis represents the volume difference between the tester and the average listening volume. Figure 6H The x-coordinate is the angle α between the independent variables (see details). Figure 5GThe vertical axis represents the volume difference between the tester's listening volume and the average listening volume. Figure 6A , Figure 6B , Figure 6C and Figure 6E As can be seen from the fitted oblique lines of the two scatter plot regions in each graph, the scatter plots corresponding to distances L1, L2, L3, and length H2 all show that the convergence of the scatter plots (more concentrated scatter points) is better as the dependent variable (vertical axis, corresponding to volume difference) decreases with the independent variable (horizontal axis, corresponding to distances L1, L2, L3, and length H, respectively). This indicates that distances L1, L2, L3, and length H2 are all highly correlated with the consistency of listening effects among different users. Furthermore, through structural design, keeping the values ​​of distances L1, L2, L3, or length H2 relatively small under different user wearing conditions can improve the consistency of listening effects among different users. The parameters significantly correlated with the consistency of listening effects among different users obtained through scatter plot verification overlap with the parameters significantly correlated with the consistency of listening effects among different users obtained through Pearson correlation analysis (both involve distances L1, L2, L3, and length H2). The significant correlation between distances L1, L2, L3, and length H2 and the consistency of listening effects among different users is also verified. In addition, the parameter that is significantly related to the consistency of the listening effect of different users as verified by the scatter plot also includes the distance L3 obtained by the stepwise regression model.

[0138] In other embodiments, based on human anatomy, the tragus 1010 and the ear canal opening 101a generally have a basically definite relative positional relationship. The position of the sound outlet 113 in the wearing state can be determined by the positional relationship between the sound outlet 113 and the tragus 1010. Since the tragus 1010 plays a role in regulating sound, the relative position of the tragus 1010 and the sound outlet 113 also affects the user's listening experience. For example, referring to... Figure 3B In the cavity-like structure, when the sound outlet 113 is located in the concha cavity 102, the tragus 1010 can reduce sound leakage from the cavity-like structure, thereby increasing the user's listening volume at the ear canal opening.

[0139] In some embodiments, to ensure a better listening experience for the user (e.g., a higher listening volume) and greater consistency in the listening experience (e.g., listening volume) among different users wearing the open-back acoustic device 10, the distance between the centroid Q2 of the outer end face 1131 of the sound outlet 113 and the apex point of the tragus 1010 can be in the range of 8mm-12mm. This setting ensures that the relevant description of the sound outlet relative to the apex point 1010a of the tragus 1010 is provided above. Figure 1BThe description is as follows. More preferably, the distance between the centroid Q2 of the outer end face 1131 of the sound outlet 113 and the top point 1010a of the tragus 1010 can be in the range of 9mm-11mm.

[0140] In some embodiments, to ensure a better listening experience for the user (e.g., a higher listening volume) and greater consistency in the listening experience (e.g., listening volume) among different users wearing the open-back acoustic device 10, the distance between the centroid O1 of the first projection 113a and the projection of the apex point 1010a of the tragus 1010 onto the sagittal plane can be in the range of 5mm-12mm. More preferably, the distance between the centroid O1 of the first projection 113a and the projection of the apex point 1010a of the tragus 1010 onto the sagittal plane can be in the range of 7mm-10mm.

[0141] In some embodiments, to ensure a better listening experience (e.g., higher volume) for the user and greater consistency in listening experience (e.g., volume) among different users wearing the open-back acoustic device 10, the closest distance between the tip 1010a of the tragus 1010 and the outer end face 1131 of the sound outlet 113 can be 2mm-10mm. More preferably, the closest distance between the tip 1010a of the tragus 1010 and the outer end face 1131 of the sound outlet 113 can be 3mm-9mm.

[0142] In some embodiments, to ensure a better listening experience for the user (e.g., a higher listening volume) and greater consistency in the listening experience (e.g., listening volume) among different users wearing the open-back acoustic device 10, the minimum distance between the centroid of the projection of the tragus 1010 in the sagittal plane and the first projection 113a can be in the range of 2mm-10mm. More preferably, the minimum distance between the centroid of the projection of the tragus 1010 in the sagittal plane and the first projection 113a can be in the range of 3mm-9mm.

[0143] Figure 7A This is a schematic diagram showing an open-back acoustic device worn on an ear model to form a reference surface, according to some embodiments of this specification. In some embodiments, such as Figure 7AAs shown, the open-back acoustic device can be worn on an ear model with a "standard" shape and size, and both positions can be kept fixed. The surface of the housing 111 of the open-back acoustic device 10 where the sound hole is located (such as the inner surface 114) is used as a reference surface. Based on the conclusions above, distances L1, L2, and L3 are significantly related to the consistency of listening effects among different users. Therefore, taking distance L1 as an example, multiple points v (such as 400 points v arranged in a 20*20 matrix) can be selected on the reference surface. These points v can represent the position of the centroid of the sound hole 113. The distances of these points on the reference surface to the centroid of the ear canal opening 101a of each tester are further measured. The point with the smallest sum of the distances between the points on the reference surface and the centroids of the ear canal openings 101a of each tester is selected as the target point. Taking one point v1 as an example, determine the distance between point v1 and the centroid of the ear canal opening of each tester, such as distances m1, m2, m3...mn, where n equals the number of testers. Summate m1, m2, m3...mn to obtain the sum of the distances between point v1 and the centroids of the ear canal openings 101a of each tester. Calculate the sum of the distances between other points and the centroids of the ear canal openings 101a of each tester using a similar method, and select the point corresponding to the minimum sum of these distances as the target point. This target point can be used as the location for setting the centroid of the outer end face 1131 of the sound outlet 113 (i.e., Q2 mentioned above).

[0144] Figure 7B This is a schematic diagram showing multiple target points formed by moving a reference plane according to some embodiments of this specification. For example... Figure 7B As shown, multiple target points can be determined at multiple locations by translating the reference plane multiple times along a direction R' parallel to the coronal axis R (e.g., translating the same distance each time). These target points are determined based on the reference plane at multiple locations. Figure 7B By fitting the data (v1-v6) together, a curve can be obtained. Based on this curve, the correlation between the distance from the centroid of the ear canal opening 101a to the reference plane and the target point can be determined. In the process of designing the open acoustic device 10, after determining the position of the housing of the sound-emitting part 11, the setting position of the sound outlet 113 (such as the position of the centroid of the sound outlet 113) can be determined based on this correlation.

[0145] In some embodiments, when not worn, there is a certain distance between the centroid of the outer end face of the sound outlet 113 and the ear hook plane 1231. Figure 8 This is a structural diagram of an ear-hook open-back headphone in an unworn state, based on some embodiments of this specification, combined with... Figure 8The ear hook structure is arc-shaped, and the ear hook plane 1231 is the plane formed by the three outermost convex points on the ear hook, that is, the plane that supports the ear hook when it is freely placed (i.e., not subjected to external force). For example, when the ear hook is freely placed on a horizontal plane, the horizontal plane supports the ear hook, and this horizontal plane can be regarded as the ear hook plane 1231. In other embodiments, the ear hook plane 1231 can also refer to the plane formed by the bisecting line that bisects or approximately bisects the ear hook along its length extension direction.

[0146] Combination Figure 8 and Figure 1A When worn, the ear hook plane 1231 is close to the plane containing the ear canal opening 101a. The distance between the centroid of the outer end face 113 of the sound outlet 113 and the ear hook plane 1231 can characterize the suspension distance between the sound outlet 113 and the ear canal opening 101a. In some embodiments, when not worn, the distance between the centroid of the outer end face 1131 of the sound outlet 113 and the ear hook plane 1231 is 0.1mm-5mm. Preferably, when not worn, the distance between the centroid of the outer end face 1131 of the sound outlet 113 and the ear hook plane 1231 is 0.3mm-4mm.

[0147] The angle formed between the inner surface of the housing 111 and the ear hook plane 1231 affects the way the sound-emitting part 11 extends into the concha 102, thus affecting the position of the sound outlet 113 and the ear canal opening 101a. The inner surface 114 of the housing 111 is the side of the housing 111 facing the face when worn. In order to ensure that the sound-emitting part 11 can better extend into the concha 102, and in order to minimize the distance from the sound outlet 113 to the ear canal opening 101a, in some embodiments, the angle formed between the inner surface of the housing 111 and the ear hook plane 1231 in the non-wearing state is in the range of 0°-10°. With this setting, the distance from the sound outlet 113 (e.g., the centroid of the sound outlet 113) to the ear canal opening 101a (e.g., the centroid of the ear canal opening 101a) can be kept relatively short, based on Figure 6A The conclusion drawn is that the listening effect of different users is highly consistent at this time. More preferably, in the non-wearing state, the angle formed between the inner surface of the sound-emitting part 11 and the ear hook plane 1231 is in the range of 0°-5°.

[0148] When the open-back acoustic device 10 is an ear-hook type earphone, the housing 111 of the sound-emitting part 11 is generally located above the ear canal opening 101a. In some embodiments, in order to minimize the distance between the sound outlet 113 and the ear canal opening 101a, the distance between the centroid of the sound outlet 113 and the lower side surface 115 of the housing 111 in the non-wearing state can be in the range of 4mm-9mm. The lower side surface 115 of the housing 111 is the side surface of the housing 111 facing the earlobe in the wearing state. With this arrangement, the distance between the sound outlet 113 (such as the centroid of the sound outlet 113) and the ear canal opening 101a (such as the centroid of the ear canal opening 101a) can be kept relatively close, based on Figure 6A The conclusion drawn is that the listening effect of different users is highly consistent at this time. More preferably, the distance between the centroid of the sound outlet 113 and the lower side 115 of the housing 111 can be in the range of 6mm-7mm when not worn.

[0149] In some embodiments, the outer end face 1131 of the sound outlet 113 can protrude from the inner side surface 114 of the housing 111 when not worn. This arrangement allows the sound outlet 113 to be closer to the ear canal opening 101a. This arrangement ensures a shorter distance between the sound outlet 113 (e.g., the centroid of the sound outlet 113) and the ear canal opening 101a (e.g., the centroid of the ear canal opening 101a), based on... Figure 6A The conclusion drawn is that the consistency of the listening experience among different users is relatively high at this point. Based on Figure 7B According to the related explanation, the optimal position of the sound outlet 113 will be different depending on the position of the plane on which the sound outlet 113 is set (such as the inner side surface 114 of the housing 111). By setting the outer end face 1131 of the sound outlet 113 to protrude from the inner side surface of the housing 111, the position of the plane on which the sound outlet 113 is set can be changed without changing the overall position of the inner side surface 114 of the housing 111.

[0150] In some embodiments, the protrusion height of the outer end face 1131 of the sound outlet 113 relative to the inner surface of the housing 111 in the non-wearing state can range from 0.1mm to 6mm. By setting the protrusion height of the outer end face 1131 of the sound outlet 113 relative to the inner surface of the housing 111 within the above range, the consistency of the listening effect when different users wear the open acoustic device 10 is further improved. More preferably, the protrusion height of the outer end face of the sound outlet 113 relative to the inner surface of the housing 111 in the non-wearing state can range from 0.3 to 4mm.

[0151] Figure 9 This is a structural schematic diagram of an ear-clip open-back headphone in an unworn state, according to some embodiments of this specification. Figure 9 This is a front view of clip-on open-back headphones placed upright on a horizontal surface (such as a desktop).

[0152] In some embodiments, combined with Figure 1A and Figure 9 The wearing structure 12 of the open-back acoustic device 10 includes an abutment portion 124 and an ear hook 123, with the ear hook 123 connecting the sound-emitting portion 11 and the abutment portion 124. In the wearing state, the abutment portion 124 abuts against the back of the user's ear, and the ear hook 123 passes around the user's antihelix 105 and helix 107. At this time, the open-back acoustic device 10 can be a clip-on open-back headphone.

[0153] The ear hook 123 has an overall arc-shaped structure. When the clip-on open-back headphones are worn, the ear hook 123 can bypass the user's antihelix 105 and helix 107, so that the sound-producing part 11 is located in the user's concha cavity (such as concha cavity 102) and contacts the concha cavity wall, and the abutment part 124 abuts against the back of the user's ear. The sound-producing part 11 and the abutment part 124 form a clamping shape to clamp the ear, thereby clamping the clip-on open-back headphones onto the user's helix, achieving stable wearing of the clip-on open-back headphones.

[0154] The abutment portion 124 abuts against the back of the user's ear, and cooperates with the sound-emitting portion 11 to form a clamping configuration for clamping the ear. In some embodiments, the abutment portion 124 may have an abutment housing, through which the abutment portion 124 is connected to the ear hook 123. The abutment housing may form a receiving space. In some embodiments, the receiving space formed by the abutment housing may serve as a battery compartment for accommodating a battery and / or other components (such as a circuit board). In some embodiments, the battery can provide power to the ear-clip open-back headphones. For example, the battery may be electrically connected to the sound-emitting component of the sound-emitting portion 11 so that the battery can provide power to the sound-emitting component. In some embodiments, the circuit board may be electrically connected to the sound-emitting component of the sound-emitting portion 11 (e.g., via a wire or flexible circuit board) so that the circuit board can control the sound-emitting component. In some embodiments, both the circuit board and the battery may be disposed within the receiving space formed by the abutment housing. In some embodiments, the circuit board and the battery may be respectively disposed in the receiving space formed by the abutting housing 111 and the receiving cavity formed by the housing of the sound-emitting part 11, and the circuit board and the battery may be electrically connected to each other through corresponding conductors, and further electrically connected to the sound-emitting component of the sound-emitting part 11 through conductors.

[0155] By configuring the open acoustic device 10 as an ear clip-on open headphone, based on the wearing method of the ear clip-on open headphone, the sound-emitting part 11 can be more easily inserted into the concha cavity 102, and the relative position of the sound outlet 113 and the ear canal opening 101a can be more easily set according to the relative position in the above embodiment.

[0156] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0157] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0158] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments of the invention, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.

[0159] Finally, it should be understood that the embodiments described in this application are merely illustrative of the principles of the embodiments of this application. Other modifications may also fall within the scope of this application. Therefore, alternative configurations of the embodiments of this application are considered as examples and not limitations, and are regarded as consistent with the teachings of this application. Accordingly, the embodiments of this application are not limited to the embodiments explicitly described and illustrated in this application.

Claims

1. An open acoustic device comprising: A sound-generating part includes a housing and a diaphragm housed within the housing, the diaphragm vibrating to generate sound, and a sound outlet is provided on the side wall of the housing facing the auricle, the sound outlet being configured to discharge the sound generated by the diaphragm through the housing; The wearing structure is configured to place the sound-producing part near the ear canal but without blocking the ear canal opening; wherein... The sound outlet and the auricle have a first projection and a second projection respectively on the sagittal plane of the human body. The centroid of the first projection and the highest point of the second projection are at a first distance in the direction of the vertical axis of the human body. The ratio of the first distance to the height of the second projection in the direction of the vertical axis is between 0.4 and 0.

7. The centroid of the first projection and the end point of the second projection are at a second distance in the direction of the sagittal axis of the human body. The ratio of the second distance to the width of the second projection in the direction of the sagittal axis is between 0.65 and 0.

8.

2. The open acoustic device as described in claim 1, wherein, The distance between the centroid of the outer end face of the sound outlet and the centroid of the ear canal opening is in the range of 5mm-13mm; and / or, The distance between the centroid of the ear canal opening and the outer end face of the sound outlet is within the range of 8mm-13mm.

3. The open acoustic device as described in claim 1, wherein, The distance between the centroid of the first projection and the centroid of the projection of the ear canal opening onto the sagittal plane ranges from 2mm to 10mm; and / or, The minimum distance between the centroid of the projection of the ear canal opening onto the sagittal plane and the first projection is in the range of 1mm-10mm.

4. The open acoustic device as described in claim 2, wherein, The area of ​​the sound outlet is 10mm². 2 -60mm 2 .

5. The open acoustic device as claimed in claim 1, wherein, The sound outlet and the auricle have a third projection and a fourth projection respectively on the coronal plane of the human body. The centroid of the third projection and the outer endpoint of the fourth projection have a third distance in the coronal axis direction of the human body. The ratio of the third distance to the length of the fourth projection in the coronal axis direction is between 0.8 and 1.

4.

6. The open acoustic device as described in claim 5, wherein, The distance between the centroid of the third projection and the centroid of the projection of the ear canal opening onto the coronal plane ranges from 4mm to 12mm; and / or, The minimum distance between the centroid of the projection of the ear canal opening onto the coronal plane and the third projection is 7mm-10mm.

7. The open acoustic device as claimed in claim 1, wherein, The distance between the centroid of the outer end face of the sound outlet and the apex of the tragus ranges from 8mm to 12mm; and / or, The closest distance between the top of the tragus and the outer end face of the sound outlet is 2mm-10mm.

8. The open acoustic device as claimed in claim 1, wherein, The distance between the centroid of the first projection and the projection of the apex of the tragus onto the sagittal plane ranges from 5mm to 12mm; and / or, The minimum distance between the projection of the apex of the tragus onto the sagittal plane and the first projection is 2mm-10mm.

9. The open acoustic device as claimed in claim 1, wherein, The length of the perpendicular line from the centroid of the ear canal opening to the outer end face of the sound outlet hole ranges from 7mm to 13mm; and / or, The length of the perpendicular line from the centroid of the outer end face of the sound outlet to the plane containing the ear canal opening ranges from 2mm to 12mm.

10. The open acoustic device as claimed in claim 1, wherein, The distance between the centroid of the outer end face of the sound outlet and the centroid of the ear canal opening on the plane is 0.2mm-8mm.

11. The open acoustic device as claimed in claim 1, wherein, The outer end face of the sound outlet is further away from the ear canal opening than the tragus and helix; the area of ​​the overlapping region between the orthographic projection of the outer end face of the sound outlet onto the plane containing the closed surface of the ear and the closed surface is 10 mm. 2 -120mm 2 The closed surface is the cross section with the largest area among the cross sections parallel to the ear canal opening within the space enclosed by the concha, tragus, and crus of the helix.

12. The open acoustic device as claimed in claim 1, wherein, The angle between the outer end face of the sound outlet and the plane where the ear canal opening is located is 0°-10°.

13. The open acoustic device as claimed in claim 1, wherein, The first distance is 25mm-38mm; and / or, the second distance is 27mm-31mm.

14. The open acoustic device as claimed in claim 1, wherein, The wearing structure includes an ear hook; in the wearing state, the ear hook extends from the back of the auricle to the frontal and outer sides of the auricle and connects with the sound-emitting part, which extends into the concha cavity; in the non-wearing state, the distance between the centroid of the outer end face of the sound outlet and the ear hook plane is 0.1mm-5mm.

15. The open acoustic device as claimed in claim 14, wherein, The outer end face of the sound outlet protrudes from the inner side of the housing, and the protrusion height of the outer end face of the sound outlet relative to the inner side of the sound-emitting part ranges from 0.1mm to 6mm.

16. The open acoustic device as claimed in claim 1, wherein, The wearing structure includes an abutment and an ear hook, the ear hook connecting the sound-emitting part and the abutment; in the wearing state, the abutment abuts against the back of the wearer's ear, and the ear hook passes around the wearer's antihelix and auricle.

17. The open acoustic device as claimed in claim 1, wherein, The open acoustic device is equipped with a microphone for acquiring ambient noise, and the open acoustic device is capable of playing noise-reduced sounds that cancel out the ambient noise.

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