Open-ear headphones

Abstract

Open-ear headphones, comprehensive: a sound-generating component comprising a transducer and a housing for the transducer; and an ear hook, wherein, in a worn state, a first part of the ear hook is suspended between the auricle and the head of a user, and a second part of the ear hook is connected to the sound-generating part to secure the sound-generating part at a location where the sound-generating part is near the ear canal without blocking the ear canal, wherein the sound-generating part is at least partially located in the cavum conchae; and wherein a sound outlet opening is provided on one inner surface of the housing facing the auricle, wherein at least two pressure relief openings, comprising a first pressure relief opening and a second pressure relief opening, are provided in the other side walls of the housing, wherein the first pressure relief opening and the second pressure relief opening are arranged offset from each other in a direction of the long axis and the distance between the center of the first pressure relief opening and the center of the second pressure relief opening is 7 mm to 15.2 mm, and wherein the direction of the long axis is a direction in which the shape of the two-dimensional projection plane of the sound-generating part extends with maximum extent.

Description

CROSS-REFERENCE

[0001] The present application claims priority from the Chinese application filed on 28 October 2022 with application number 202211336918.4, the priority from the Chinese application filed on 1 December 2022 with application number 202223239628.6 and the priority from the international application filed on 30 December 2022 with application number PCT / CN 2022 / 144339, all contents of which are incorporated herein by reference. TECHNICAL AREA

[0002] The present application concerns the field of acoustics, in particular an open-ear headphone. STATE OF THE ART

[0003] With the development of acoustic delivery technology, acoustic devices (such as headphones) are finding widespread use in everyday life. They can work in conjunction with electronic devices like mobile phones and computers to provide users with a fantastic audio experience. Open-ear headphones are portable audio devices that allow sound transmission within a specific area. Compared to traditional in-ear and over-ear headphones, open-ear headphones are distinguished by the fact that they do not block or cover the ear canal. This allows users to still perceive acoustic information from their surroundings while listening to music, increasing safety and comfort. The sound output of open-ear headphones has a significant impact on user comfort.

[0004] Therefore, it is necessary to provide an open-ear headphone to improve the output performance of the open-ear headphone. REVELATION OF THE INVENTION

[0005] One embodiment of the present application provides an open-ear headphone comprising: a sound-generating element comprising a transducer and a housing for receiving the transducer, the transducer comprising a diaphragm; and an ear hook, wherein, in a worn state, a first part of the ear hook is suspended between the auricle and the head of a user, and a second part of the ear hook extends to a side of the auricle facing away from the head and is connected to the sound-generating element to secure the sound-generating element at a location near the ear canal without obstructing the ear canal, wherein a sound outlet opening is provided on an inner surface of the housing facing the auricle, which is used to draw sound generated at a front of the diaphragm out of the housing and then transmit it to the ear canal.wherein at least two pressure relief openings are provided in the other side walls of the housing, comprising a first pressure relief opening and a second pressure relief opening, and wherein the distance between the center of the first pressure relief opening and the center of the second pressure relief opening is 13.0 mm to 15.2 mm.

[0006] In some embodiments, the distance between the center of the sound outlet opening and the perpendicular plane of a connecting line between the center of the first pressure relief opening and the center of the second pressure relief opening is 0 mm to 2 mm.

[0007] In some embodiments, the first pressure relief opening is provided on a top side of the housing and the second pressure relief opening is provided on a bottom side of the housing.

[0008] In some embodiments, it is provided that the housing, in the worn state, is at least partially inserted into the cave conchae, and wherein the distance between the center of the second pressure relief opening and the back of the housing is greater than the distance between the center of the first pressure relief opening and the back.

[0009] In some embodiments, the distance between the center of the first pressure relief opening and the inside of the housing facing the ear is in the range of 4.24 mm to 6.38 mm.

[0010] In some embodiments, the distance between the center of the first pressure relief opening and the rear side is in the range of 10.44 mm to 15.68 mm.

[0011] In some embodiments, the transducer includes a magnetic circuit arrangement used to provide a magnetic field, and the distance between the center of the first pressure relief opening and a base surface of the magnetic circuit arrangement is in the range of 1.31 mm to 1.98 mm.

[0012] In some embodiments, the transducer includes a magnetic circuit arrangement used to provide a magnetic field, and the distance between the center of the first pressure relief orifice and a median plane of a long axis of the magnetic circuit arrangement is in the range of 5.45 mm to 8.19 mm.

[0013] In some embodiments, the distance between the center of the second pressure relief opening and the rear side ranges from 13.51 mm to 20.27 mm.

[0014] In some embodiments, the transducer includes a magnetic circuit arrangement used to provide a magnetic field, wherein the distance between the center of the second pressure relief opening and the base of the magnetic circuit arrangement is in the range of 1.31 mm to 1.98 mm.

[0015] In some embodiments, the transducer includes a magnetic circuit arrangement used to provide a magnetic field, and the distance between the center of the second pressure relief orifice and the median plane of the long axis of the magnetic circuit arrangement is in the range of 5.46 mm to 8.20 mm.

[0016] In some embodiments, it is provided that the housing, in the worn state, is at least partially inserted into the cave conchae, and wherein the area of ​​the second pressure relief opening is smaller than the area of ​​the first pressure relief opening.

[0017] In some embodiments, the area of ​​the first pressure relief opening is provided to be in the range of 3.78 mm. 2 up to 22.07 mm 2 lies, and wherein the area of ​​the second pressure relief opening is in the range of 2.78 mm 2 up to 16.07 mm 2 lies.

[0018] In some embodiments, the ratio of the area of ​​the first pressure relief opening to the area of ​​the top is between 0.036 and 0.093, and the ratio of the area of ​​the second pressure relief opening to the area of ​​the bottom is between 0.018 and 0.051.

[0019] In some embodiments, the transducer comprises a magnetic circuit arrangement used to provide a magnetic field, and wherein the coincident area of ​​the projections of the first pressure relief orifice and the second pressure relief orifice onto the median plane of the long axis of the magnetic circuit arrangement is not greater than 10.77 mm² 2 amounts.

[0020] In some embodiments, the length of the connecting line between a projection point of the center of the first pressure relief opening and a projection point of the center of the second pressure relief opening onto a plane in which the base of the magnetic circuit arrangement is located is in the range of 8.51 mm to 15.81 mm.

[0021] In some embodiments, the angle between the connecting line and the direction of the short axis of the housing is in the range of 12.85° to 23.88°.

[0022] In some embodiments, it is provided that the housing, in the worn state, at least partially covers the antihelix, and wherein the deviation of the distance between the center of the second pressure relief opening on the underside and the back of the housing from the distance between the center of the first pressure relief opening on the top and the back is less than 10%.

[0023] In some embodiments, the distance between the center of the first pressure relief opening and the inner surface of the housing facing the ear is in the range of 4.43 mm to 7.96 mm, or the distance between the center of the second pressure relief opening and the inner surface is in the range of 4.43 mm to 7.96 mm.

[0024] In some embodiments, the distance between the center of the first pressure relief opening and the rear side is in the range of 8.60 mm to 12.92 mm, or the distance between the center of the second pressure relief opening and the rear side is in the range of 8.60 mm to 12.92 mm.

[0025] In some embodiments, it is provided that the ratio of the dimension of the long axis of the first pressure relief opening to the dimension of the short axis of the first pressure relief opening is in the range of 1 to 8, or that the ratio of the dimension of the long axis of the second pressure relief opening to the dimension of the short axis of the second pressure relief opening is in the range of 1 to 8.

[0026] In some embodiments, it is provided that there is a first distance between the center of the first pressure relief opening and the center of the sound outlet opening, and a second distance between the center of the second pressure relief opening and the sound outlet opening, and wherein the deviation of the first distance from the second distance is less than 10%.

[0027] In some embodiments, the first distance is specified as being between 5.12 mm and 15.11 mm.

[0028] In some embodiments, the distance between a projection point of the center of the first pressure relief opening onto the sagittal plane and a projection point of the center of the upper boundary of the inside onto the sagittal plane is in the range of no more than 2 mm.

[0029] In some embodiments, the distance between the projection point of the center of the upper boundary of the inner side onto the sagittal plane and a projection point of the center of the ear canal opening onto the sagittal plane is in the range of 12 mm to 18 mm.

[0030] In some embodiments, the distance between the projection point of the center of the first pressure relief opening onto the sagittal plane and a projection point of the center of the ear canal opening onto the sagittal plane is in the range of 12 mm to 18 mm.

[0031] In some embodiments, the distance between a projection point of the center of the second pressure relief opening onto the sagittal plane and a projection point of the center of the ear canal opening onto the sagittal plane is in the range of 6.88 mm to 10.32 mm.

[0032] In some embodiments, the distance between a projection point of the center of the second pressure relief opening onto the sagittal plane and the projection point of the center of the upper boundary of the inside onto the sagittal plane is in the range of 14.4 mm to 21.6 mm.

[0033] In some embodiments, the distance between a projection point of the center of the first pressure relief opening onto the sagittal plane and a projection point of a point at the third of the lower boundary of the inside onto the sagittal plane is in the range of 13.76 mm to 20.64 mm.

[0034] In some embodiments, the distance between a projection point of the center of the second pressure relief opening onto the sagittal plane and the projection point of the point at the third of the lower boundary of the inside onto the sagittal plane is in the range of 8.16 mm to 12.24 mm.

[0035] In some embodiments, the distance between the projection point of the point on the third of the lower boundary of the inner surface onto the sagittal plane and the projection point of the ear canal opening onto the sagittal plane is in the range of 1.76 mm to 2.64 mm.

[0036] In some embodiments, it is provided that, in the worn state, the distance between the first pressure relief opening and any point on the second part of the ear hook in the direction of the long axis of the sound-generating part is in the range of 5.28 mm to 13.02 mm.

[0037] An embodiment of the present description further provides an open-ear headphone comprising: a sound-generating element comprising a transducer and a housing for receiving the transducer, the transducer comprising a diaphragm; and an ear hook, wherein, in a worn state, a first part of the ear hook is suspended between the auricle and the head of a user, and a second part of the ear hook extends to a side of the auricle facing away from the head and is connected to the sound-generating element to secure the sound-generating element at a location near the ear canal without obstructing the ear canal, wherein a sound outlet opening is provided on an inner surface of the housing facing the auricle, which is used to draw sound generated at a front of the diaphragm out of the housing and then transmit it to the ear canal.wherein at least two pressure relief openings are provided in the other side walls of the housing, comprising a first pressure relief opening and a second pressure relief opening, and wherein the distance between the center of the sound outlet opening and the perpendicular plane of a line connecting the center of the first pressure relief opening with the center of the second pressure relief opening is 0 mm to 2 mm.

[0038] An embodiment of the present description further provides an open-ear headphone comprising: a sound-generating element comprising a transducer and a housing for receiving the transducer, the transducer comprising a diaphragm; and an ear hook, wherein, in a worn state, a first part of the ear hook is suspended between the auricle and the head of a user, and a second part of the ear hook extends to a side of the auricle facing away from the head and is connected to the sound-generating element to secure the sound-generating element at a location near the ear canal without obstructing the ear canal, wherein a sound outlet opening is provided on an inner surface of the housing facing the auricle, which is used to draw sound generated at a front of the diaphragm out of the housing and then transmit it to the ear canal.wherein at least two pressure relief openings are provided in the other side walls of the housing, comprising a first pressure relief opening and a second pressure relief opening, wherein the housing is at least partially inserted into the caveum conchae, and wherein the area of ​​the second pressure relief opening is smaller than the area of ​​the first pressure relief opening. BRIEF DESCRIPTION OF THE FIGURES

[0039] The present application is further illustrated by exemplary embodiments, which are described in detail by the accompanying drawings. These embodiments are not limiting. In the embodiments, the same structure is designated with the same reference numeral. In the figures: Fig. Figure 1 shows a schematic representation of an exemplary ear according to some embodiments of the present application; Fig. Figure 2 shows an exemplary structural representation of an open-ear headphone according to some embodiments of the present application; Fig. Figure 3 shows a schematic representation of two point sound sources and a listening position according to some embodiments of the present application; Fig. Figure 4 shows a comparison diagram of the sound loss indices with respect to a single-point sound source and a double-point sound source at different frequencies according to some embodiments of the present application; Fig. Figure 5 shows a schematic representation of an exemplary distribution for a dipole sound source with a baffle arranged between two sound sources according to some embodiments of the present application; Fig. Figure 6 shows a diagram of the sound loss indices with respect to the dipole sound source with and without a baffle arranged between two sound sources according to some embodiments of the present application; Fig. Figure 7 shows a schematic representation of the open-ear headphones in an exemplary worn state according to some embodiments of the present application; Fig. Figure 8 shows a schematic structural representation of one side of the open-ear headphones facing the ear. Fig. 7; Fig. Figure 9 shows a schematic structural representation of the housing made of Fig. 8; Fig. Figure 10 shows a schematic representation of an exemplary distribution of a dipole sound source with a chamber structure arranged around one of the sound sources according to some embodiments of the present application; Fig. Figure 11A shows a schematic representation of a principle of hearing in a structure of a dipole sound source and a chamber structure formed around one of the sound sources of the dipole sound source according to some embodiments of the present application; Fig. Figure 11B shows a schematic representation of a sound loss principle in a structure of a dipole sound source and a chamber structure formed around one of the sound sources of the dipole sound source according to some embodiments of the present application; Fig. Figure 12A shows a schematic representation of the chamber structure with two horizontal openings according to some embodiments of the present application; Fig. Figure 12B shows a schematic representation of the chamber structure with two vertical openings according to some embodiments of the present application; Fig. Figure 13 shows a comparison diagram of audibility index curves for chamber structures with two openings or one opening according to some embodiments of the present application; Fig. Figure 14 shows a schematic representation of the open-ear headphones in an exemplary worn state according to some further embodiments of the present application; Fig. Figure 15 shows a schematic structural representation of one side of the open-ear headphones facing the ear. Fig. 14; Fig. Figure 16 shows a schematic structural representation of a housing of the open-ear headphones according to some embodiments of the present application; Fig. Figure 17 shows a diagram of frequency response curves of an open-ear headphone corresponding to the first pressure relief openings with different areas according to some embodiments of the present application; Fig. Figure 18 shows a diagram of frequency response curves of an open-ear headphone corresponding to the second pressure relief openings with different areas according to some embodiments of the present application; Fig. Figure 19 shows a schematic representation of a projection of the open-ear headphones in the worn state onto the sagittal plane according to some embodiments of the present application; Fig. Figure 20A shows an exemplary representation of an internal structure of a sound-generating part according to some embodiments of the present application; Fig. Figure 20B shows an exemplary structural representation of a second acoustic chamber according to some embodiments of the present description; Fig. Figure 20C shows a diagram of frequency response curves of a rear chamber at different sizes of an angle α according to some embodiments of the present description; Fig. Figure 21 shows an exemplary representation of an internal structure of a converter according to some embodiments of the present application; Fig. Figure 22 shows a schematic representation of the housing of the open-ear headphone in the Z direction on a plane on which the base of a magnetic circuit arrangement is located. DETAILED EXECUTION FORMS

[0040] To further explain the technical solutions of the embodiments of the present application, the drawings required for describing these embodiments are briefly summarized below. Naturally, the following drawings merely represent some examples or embodiments of the present application, and the person skilled in the art can apply the present application to other similar scenarios without inventive step by referring to these drawings. Unless otherwise indicated or understood from the context, the same reference numerals in the figures refer to the same structures or operations.

[0041] It is understood that the terms "system," "device," "unit," and / or "module," as used herein, are a method for distinguishing between different components, elements, parts, or assemblies at different levels. However, where other words can serve the same purpose, these terms may be substituted.

[0042] As shown in the application and the claims, the terms "a" and / or "the" do not necessarily refer to the singular form, but may also include the plural form unless clearly indicated otherwise in the context. In general, the expressions "comprise" and "contain" only indicate that the specifically identified steps and elements are included, that these steps and elements do not constitute an exclusive list, and that further steps or elements may be included in the method or apparatus.

[0043] In the explanatory notes to this application, it should be understood that the terms "first", "second", "third", and "fourth", etc., serve only for descriptive purposes, without indicating or suggesting the relative importance or number of the technical features concerned. Thus, the features defined as "first", "second", "third", and "fourth" may explicitly or implicitly include at least one of the features. In the explanatory notes to this application, the word "several" refers to at least two, such as two, three, etc., unless expressly defined otherwise.

[0044] In this application, the terms "connect" and "fasten" and the like are to be understood in a broad sense, unless expressly stated or defined otherwise. For example, the term "connect" may refer to a fixed, detachable, or one-piece connection, which may be a mechanical or electrical connection; which may be a direct connection or an indirect connection via an intermediate medium, or internal communication between two elements, or an interaction relationship between the two elements, unless expressly defined otherwise. The specific meaning of the above terms in this application may be understood by the person skilled in the art in the art in light of the particular circumstances.

[0045] Fig. Figure 1 shows a schematic representation of an exemplary ear according to some embodiments of the present application. With reference to Fig. 1 The ear 100, which can also be referred to as the auricle, can comprise an external auditory canal 101, a concha 102, a cymba conchae 103, a triangular fossa 104, an antihelix 105, a scapha 106, a helix 107, an earlobe 108, a tragus 109, and a crus helicis 1071. In some embodiments, stability when wearing an acoustic device can be achieved by supporting it with one or more sections of the ear 100. In some embodiments, the external auditory canal 101, the concha 102, the cymba conchae 103, the triangular fossa 104, and other sections have a specific depth and volume in three-dimensional space so that the wearing requirements of the acoustic device can be met. The acoustic device (e.g. an in-ear headphone) can, for example, be worn in the outer ear canal 101.In some embodiments, the acoustic device (e.g., open-ear headphones) can be worn using a section of the ear 100 other than the external auditory canal 101. For example, the acoustic device can be worn using a section such as the cymba conchae 103, the fossa triangularis 104, the antihelix 105, the scapha 106, or the helix 107, or a combination of these sections. In some embodiments, the earlobe 108 and other sections of the user can also be used to improve the comfort and security of wearing the acoustic device. By using sections of the ear 100 other than the external auditory canal 101 for wearing the acoustic device and for sound propagation, the user's external auditory canal 101 can be "freed up."When the user wears the acoustic device (for example, open-ear headphones), the acoustic device cannot block the outer ear canal 101 (or the ear canal or ear canal opening), so that the user can receive sound from the acoustic device as well as sound from the environment (for example, a whistle, bicycle bell, surrounding conversations, audible traffic instructions, etc.), thus reducing the probability of a traffic accident. In some embodiments, the acoustic device is designed as a structure that adapts to the ear 100, depending on its construction, to allow the sound-generating part of the acoustic device to be worn in different positions on the ear.For example, if the acoustic device is an open-ear headphone, the open-ear headphone may comprise a suspension structure (for example, an ear hook) and a sound-generating part that are physically connected to each other. The suspension structure may conform to the shape of the auricle to direct all or part of the sound-generating part onto an anterior surface of the tragus 109 (for example, an area J enclosed by dashed lines in ). Fig. 1) to arrange. For example, the entire or partial structure of the sound-generating part of the user-worn open-ear headphones may also be in contact with an upper part of the external auditory canal 101 (for example, a section on which one or more of the cymba conchae 103, the fossa triangularis 104, the antihelix 105, the scapha 106, the helix 107, the crus helicis 1071 or the like are located). For example, in user-worn open-ear headphones, the entire or partial structure of the sound-generating part can be located in a chamber formed by one or more sections (for example, the cavum conchae 102, the cymba conchae 103, the fossa triangularis 104, etc.) of the ear 100, for example, a region M1 including at least the cymba conchae 103 and the fossa triangularis 104 and a region M2 including at least the cavum conchae 102, the two regions being separated by dashed lines in Fig. 1 are included.

[0046] Individual variations may exist among different users, leading to different ear shapes, sizes, and other dimensions. For the sake of clarity and better understanding, unless otherwise stated, this application primarily uses a standard-shaped and standard-sized ear model as a reference to describe the wearing of the acoustic devices in the various embodiments. Based on standards ANSI S3.36, S3.25, and IEC 60318-7, for example, a simulator with a head including (left and right) ears, such as the GRAS 45BC KEMAR, can be manufactured as a reference for wearing an acoustic device to represent the situations of most users when wearing the device normally.By way of example, the ear serving as a reference may have the following relevant features: The dimension of the auricle on the sagittal plane in one direction of the vertical axis may range from 49.5 mm to 74.3 mm, and the dimension of the auricle on the sagittal plane in one direction of the sagittal axis may range from 36.6 mm to 55 mm. Therefore, expressions such as "worn by the user," "being in the worn state," and "in the worn state" in this application may refer to the acoustic device described in this application being worn on the ear of the aforementioned simulator. Given the individual variations between different users, the structure, shape, size, and thickness of one or more sections of the ear may also exhibit certain differences. To meet the different needs of users, the acoustic device may be designed in a differentiated manner.This differentiated design can manifest itself in the fact that the characteristic parameters of one or more sections of the acoustic device (for example, a sound-generating part, an ear hook, etc., as described below) can have values ​​within different ranges in order to adapt to different ears.

[0047] It should be noted that in medicine and anatomy, three fundamental planes of section can be defined for the human body: the sagittal plane, the coronal plane, and the horizontal plane. Three fundamental axes can also be defined: the sagittal axis, the coronal axis, and the vertical axis. The sagittal plane is a plane of section perpendicular to the ground, running from front to back of the body, dividing the human body into a left and a right part. The coronal plane is a plane of section perpendicular to the ground, running from left to right of the body, dividing the human body into an anterior and a posterior part.The horizontal plane refers to a cross-sectional plane perpendicular to the ground in the top-bottom direction of the body, dividing the human body into an upper and a lower part. Accordingly, the sagittal axis refers to an axis running in the front-back direction of the body and perpendicular to the coronal plane, the coronal axis to an axis running in the left-right direction of the body and perpendicular to the sagittal plane, and the vertical axis to an axis running in the top-bottom direction of the body and perpendicular to the horizontal plane. Furthermore, the expression "front of the ear" as described in this application is intended to be the opposite of the expression "back of the ear," the former referring to a side of the ear facing away from the head and the latter to a side of the ear facing the head.When viewing the ear of the aforementioned simulator in the direction of the coronal axis of the human body, the following results: Fig. 1. Schematic representation of the front contour shown.

[0048] Fig. Figure 2 shows an exemplary structural representation of an open-ear headphone according to some embodiments of the present application.

[0049] In some embodiments, the open-ear headphone 10 may include, but is not limited to, an air conduction headphone and a bone conduction headphone, etc. The open-ear headphone 10 may also be combined with products such as eyeglasses, a headset, a head-mounted display, an AR / VR headset, or the like.

[0050] As in Fig. As shown in Figure 2, the open-ear headphone 10 can include a sound-generating part 11 and an ear hook 12.

[0051] The sound-generating part 11 can be worn on the user's body, and the sound-generating part 11 can generate a sound for input into the user's ear canal. In some embodiments, the sound-generating part 11 can incorporate a transducer, such as one in Fig. The transducer 116 shown in Figure 20A comprises a housing 111 for receiving the transducer. The housing 111 can be connected to the ear hook 12. The transducer is used to convert an electrical signal into a corresponding mechanical vibration, thus generating sound. In some embodiments, a sound outlet opening 112 is provided on an inner surface of the housing facing the auricle. The sound outlet opening 112 is used to direct sound generated by the transducer out of the housing 111 and then transmit it to the ear canal so that the user can hear the sound. In some embodiments, the housing 111 can be extended through the transducer (for example, a diaphragm) into a front chamber (for example, a chamber in Fig. The front chamber 114 (shown in Figure 20A) and a rear chamber of the headphones are separated. The sound outlet 112 can communicate with the front chamber to direct the sound generated in the front chamber out of the housing 111 and transmit it to the ear canal. In some embodiments, some of the sound directed through the sound outlet 112 can propagate to the ear canal so that the user can hear the sound, and another part of it, along with the sound reflected at the ear canal, can propagate out of the open-ear headphones 10 and the ear through a gap between the sound-generating part 11 and the ear (for example, a part of the cavum conchae not covered by the sound-generating part 11), resulting in a first far-field sound loss.Simultaneously, one or more pressure relief openings 113 are typically provided on another side of the housing 111 (for example, a side furthest from or facing away from the user's ear canal). The pressure relief opening 113 is located further from the ear canal than the sound outlet opening 112. A second sound loss in the far field typically occurs for the sound propagating from the pressure relief opening 113. The magnitude of the first sound loss is comparable to the magnitude of the second sound loss, and the phases of the first and second sound losses are (almost) out of phase, so that the two can cancel each other out in the far field, thus reducing the far field sound loss of the open-ear headphones 10.In some embodiments, at least two pressure relief openings 113 can be provided on a different side of the housing 111 than the side facing the auricle. Providing these at least two pressure relief openings 113 makes it possible not only to vent the sound generated in the rear chamber from the housing 111, but also to disrupt a high-pressure zone of a sound field in the rear chamber. This shortens the wavelength of a standing wave in the rear chamber, resulting in the sound vented from the housing 111 through the pressure relief openings 113 having the highest possible resonance frequency, for example, higher than 4 kHz.In this way, the sound emitted through the sound outlet opening 112 and the sound emitted through the pressure relief openings 113 can maintain good agreement over a wider frequency range, so that the two interfere and cancel each other out better in the far field, thus achieving a better effect in reducing sound loss. To facilitate the description, the present description is illustrated using the example of a sound-generating part 11 with two pressure relief openings. For illustrative purposes only, the at least two pressure relief openings 113 can be a first pressure relief opening and a second pressure relief opening, such as the first pressure relief opening 1131 and the second pressure relief opening 1132 in [reference missing]. Fig. 7. The two pressure relief openings 113 can each be located on opposite sides of the housing 111. They are arranged, for example, facing away from each other in a subsequent direction Y along a short axis, in order to maximally disrupt the high-pressure zone of the sound field in the rear chamber. In short, the user wearing the open-ear headphones 10 primarily hears sound transmitted to the ear canal through the sound outlet opening 112. The pressure relief opening 113 is primarily intended to equalize the pressure in the rear chamber, thus enabling sufficient vibration at a large amplitude and low frequency. This results in the sound having a tone quality with deep bass extension and penetrating treble, and reduces sound escaping into the environment through the sound outlet opening 112.For further explanations of the sound-generating part 11, reference is made to the other sections of the present application, for example to . Fig. 7, Fig. 14, Fig. 20A etc. and their explanations.

[0052] One end of the ear hook 12 can be connected to the sound-generating part 11, while its other end extends along a connection area between the user's ear and head. In some embodiments, the ear hook 12 can be configured as an arc-shaped structure to fit the user's ear, allowing the ear hook 12 to hang on the user's ear. For example, the ear hook 12 can have an arc-shaped structure that fits the connection area between the user's head and ear. This allows the ear hook 12 to hang between the user's ear and head. In some embodiments, the ear hook 12 can also be configured as a clamping structure that fits the user's ear, allowing the ear hook 12 to be clamped onto the user's ear. For example, the ear hook 12 can have a hook portion (a first portion 121, as in Fig. 7 shown) and a connecting part (a second part 122, as in Fig. (7 shown) comprise the two parts, which are connected sequentially. The connecting part links the hook part to the sound-generating part 11, so that the open-ear headphone 10, when not being worn (i.e., in its natural state), is arc-shaped in three-dimensional space. In other words, in three-dimensional space, the hook part, the connecting part, and the sound-generating part 11 are not coplanar. Therefore, when the open-ear headphone 10 is worn, the hook part is primarily used for suspension between the back of the ear and the user's head, and the sound-generating part 11 is primarily used for contact with the front of the user's ear, which in turn allows the sound-generating part 11 to interact with the hook part to clamp the ear.As an example, the connecting part can extend outwards from the head so that it interacts with the hook part to provide a pressing force on the front of the ear for the sound-generating part 11. Under the influence of this pressing force, the sound-generating part 11 can, in particular, rest against an area where a section such as the cavum conchae 102, the cymba conchae 103, the fossa triangularis 104, the antihelix 105, or the like is located, so that the open-ear headphones 10 do not block the external auditory canal 101 of the ear when worn.

[0053] To improve the stability of the open-ear headphones 10 when worn, one of the following possibilities or a combination thereof can be used in some embodiments of the open-ear headphones 10. First: The ear hook 12 is designed, at least partially, as a profiled structure that conforms to at least one of the back surfaces of the ear 100 and the head in order to increase the contact area of ​​the ear hook 12 with the ear 100 and / or the head, thereby increasing the resistance to the open-ear headphones 10 falling out of the ear 100. Second: The ear hook 12 is designed, at least partially, as an elastic structure so that it exhibits a certain degree of deformability when worn, in order to increase the positive pressure of the ear hook 12 on the ear and / or the head, thereby increasing the resistance to the open-ear headphones 10 falling out of the ear.Third: The ear hook 12 is at least partially designed so that, when worn, it presses against the head, thereby creating a counterforce that presses against the ear. This presses the sound-generating element 11 against the front of the ear to increase the resistance against the open-ear headphones 10 falling out of the ear. Fourth: The sound-generating element 11 and the ear hook 12 are arranged so that, when worn, they each clamp the antihelix and the cavum conchae, etc., from the front and back of the ear, respectively, to increase the resistance against the open-ear headphones 10 falling out of the ear.Fifth: The sound-generating part 11 or an associated auxiliary structure is arranged such that it / they protrude at least partially into chambers such as the cavum conchae, the cymba conchae, the fossa triangularis or the scapha in order to increase the resistance against the open-ear headphones 10 falling out of the ear.

[0054] In some embodiments, the ear hook 12 may, but is not limited to, comprise an ear hook, an elastic band, or the like, so that the open-ear headphones 10 can be more securely attached to the user's body, thus preventing them from falling out during use. In some embodiments, the open-ear headphones 10 may not include an ear hook 12, and the sound-generating part 11 can be attached near the user's ear 100 by suspension or clamping.

[0055] In some embodiments, the sound-generating part 11 can, for example, have a regular or irregular shape, such as an annular, oval, track-shaped, polygonal, U-shaped, V-shaped, or semicircular shape, so that the sound-generating part 11 can hang directly on and rest against the user's ear 100. In some embodiments, the sound-generating part 11 can have a long-axis direction X and a short-axis direction Y that are perpendicular to the thickness direction Z and orthogonal to each other. The long-axis direction X can be defined as a direction in which a section of the shape of the two-dimensional projection surface of the sound-generating part 11 (e.g.,a projection of the sound-generating part 11 onto a plane in which its outer surface is located, or onto the sagittal plane) with maximum extent, wherein, for example, the direction of the long axis corresponds to the longitudinal direction of a rectangular shape or an approximately rectangular shape if the projection is also rectangular or approximately rectangular. The direction Y of the short axis can be defined as a direction in which a portion of the shape of the projection of the sound-generating part 11 onto the sagittal plane extends perpendicular to the direction X of the long axis, wherein, for example, the direction of the short axis corresponds to the latitude direction of a rectangular shape or an approximately rectangular shape if the projection is also rectangular or approximately rectangular.The thickness direction Z can be defined such that it runs perpendicular to the two-dimensional projection surface and, for example, points to the left and right parts of the body respectively, in accordance with the direction of the coronal axis.

[0056] In some embodiments, the sound-generating element 11 of the user-worn open-ear headphones 10 can be attached at a location close to the user's outer ear canal 101 without obstructing it. In some embodiments, the projection of the open-ear headphones 10 onto the sagittal plane does not cover the user's ear canal when worn. For example, the projection of the sound-generating element 11 onto the sagittal plane can fall to both sides of the head and be positioned (as in the one shown in the illustration) to allow the sound to pass over the ear canal. Fig. 2 (position represented by a solid block A) in front of the tragus along the sagittal axis of the human body. Here, the sound-generating part 11 is located in front of the user's tragus, and the long axis of the sound-generating part 11 can be in a vertical or near-vertical position. Furthermore, the projection of the Y direction of the short axis onto the sagittal plane corresponds to the direction of the sagittal axis, the projection of the X direction of the long axis onto the sagittal plane corresponds to the direction of the vertical axis, and the thickness direction Z is perpendicular to the sagittal plane. As another example, the projection of the sound-generating part 11 onto the sagittal plane can be into the antihelix 105 (as in Fig. 2 (location shown by a dashed block C). In this configuration, the sound-generating part 11 is located at least partially on the antihelix 105, and the long axis of the sound-generating part 11 is in a horizontal or nearly horizontal position. Furthermore, the projection of direction X of the long axis of the sound-generating part 11 onto the sagittal plane corresponds to the direction of the sagittal axis, the projection of direction Y of the short axis onto the sagittal plane corresponds to the direction of the vertical axis, and the thickness direction Z is perpendicular to the sagittal plane. In this way, it is possible to prevent the sound-generating part 11 from covering the ear canal, thus freeing the user's ears. Moreover, the contact area between the sound-generating part 11 and the ear 100 can be increased, further improving the comfort of wearing the open-ear headphones 10.

[0057] In some embodiments, it is provided that, when worn, the projection of the open-ear headphones 10 onto the sagittal plane can cover, or at least partially cover, the user's ear canal. For example, the projection of the sound-generating element 11 onto the sagittal plane can extend into the cavum conchae 102 (as in the Fig. 2 (location shown by a dashed block B) and is in contact with the crus helicis 1071 and / or the helix 107. Here, the sound-generating part 11 is located at least partially within the cavum conchae 102 and is in an oblique position. Furthermore, a specific angle can be formed by the projection of the direction Y of the short axis of the sound-generating part 11 onto the sagittal plane and the direction of the sagittal axis; that is, the direction Y of the short axis is also obliquely oriented. Similarly, a specific angle can be formed by the projection of the direction X of the long axis onto the sagittal plane and the direction of the sagittal axis; that is, the direction X of the long axis is also obliquely oriented. The thickness direction Z is also perpendicular to the sagittal plane.The conchae 102 has a certain volume and depth, creating a certain distance between the inner surface IS of the open-ear headphone 10 and the conchae. The ear canal can communicate with the outside environment through the gap between the inner surface IS and the conchae, thus allowing the user's ears to be exposed. Simultaneously, the sound-generating element 11, together with the conchae, can form an auxiliary chamber, such as the chamber structure described below, which communicates with the ear canal. In some embodiments, the sound outlet 112 can be located at least partially within this auxiliary chamber. The sound emitted through the sound outlet 112 can be limited by the auxiliary chamber, i.e., the auxiliary chamber can focus the sound.This allows more sound to be transmitted into the ear canal, thus improving the volume and sound quality of the sound heard by the user in the near field, which contributes to improving the acoustic performance of the Open-Ear Headphone 10.

[0058] The description of the above open-ear headphones 10 serves only for illustrative purposes and is not intended to limit the scope of this application. Various changes and modifications can be made by the person skilled in the art in this application, as described above. For example, the open-ear headphones 10 can further include a battery arrangement, a Bluetooth arrangement, and the like, as well as a combination thereof. The battery arrangement can be used to power the open-ear headphones 10. The Bluetooth arrangement can be used to wirelessly connect the open-ear headphones 10 to another device, such as a mobile phone, a computer, or the like. These changes and modifications fall within the scope of protection of this application.

[0059] Fig. Figure 3 shows a schematic representation of two point sound sources and a listening position according to some embodiments of the present application. In conjunction with Fig. In some embodiments, it is provided that sound can be transmitted from the open-ear headphones 10 through the sound outlet opening 112, which can be considered a single-pole sound source (or point sound source) A1 for generating a first sound. The sound can be transmitted outwards from the open-ear headphones 10 through the pressure relief opening 113, which can be considered a single-pole sound source (or point sound source) A2 for generating a second sound. The second sound can be out of phase or nearly out of phase with the first sound, so that they can cancel each other out in the far field, thus forming an "acoustic dipole" to reduce sound loss.In some embodiments, a connecting line between the two single-pole sound sources can be directed towards the ear canal (referred to as the "listening position") when worn, so that the user can hear a sound at a sufficient volume. The magnitude of a sound pressure (referred to as Pear) at the listening position can then serve to characterize the volume heard by the user (i.e., a sound pressure when listening in the near field). Furthermore, it is provided that the magnitude of the sound pressure (referred to as Pfar) is projected onto a spherical surface centered on the center of the user's listening position, or onto the center of a dipole sound source (as shown in A1 and A2 in Figure 1). Fig. 3) centered spherical surface with radius r, where the magnitude of the sound pressure can be used to characterize the strength of the far-field sound loss of the open-ear headphones 10 (i.e., a far-field sound pressure in relation to the sound loss). Pfar can be determined by various statistical methods, for example, by calculating the average sound pressure at different points on the spherical surface or by area integration of the sound pressure distribution at different points on the spherical surface.

[0060] It is evident that the method for measuring sound loss in the present application serves merely as an example of the principle and its effect and is not intended as a limitation. The method for measuring and calculating sound loss can be appropriately adapted to the actual circumstances. In the far field, for example, the sound pressure amplitudes of two or more points, uniformly distributed within a specific solid angle, are averaged centered on the center of the dipole sound source. In some embodiments, the measurement can be performed by selecting a point near the point sound source as the listening position, and the sound pressure amplitude determined at this listening position is then referred to as the value of the listening position. In some embodiments, the listening position may lie on the line connecting the two point sound sources, but it may also not.The measurement and calculation method for listening can also be appropriately adapted to the actual conditions. For example, the sound pressure amplitudes from other points or from more than one point in the near field are averaged. In the near field, the sound pressure amplitudes from two or more than two points, evenly distributed within a specific solid angle, are also averaged, centered on a specific point sound source. In some embodiments, the distance between the listening position in the near field and the point sound source can be smaller than the distance between the point sound source and the spherical surface when measuring sound loss in the far field.

[0061] Naturally, the sound pressure Pear transmitted from the open-ear headphones 10 to the user's ear should be sufficiently high to enhance audibility. Furthermore, the sound pressure Pfar in the far field should be sufficiently low to maximize sound loss reduction. Therefore, a sound loss index α can serve as a measure for evaluating the sound loss reduction capability of the open-ear headphones 10. α=|Pfar|2|Pear|2.

[0062] Formula (1) shows that the lower the sound loss index, the greater the open-ear headphone's ability to reduce sound loss. At the same volume levels when listening in near-field positions, sound loss in the far field is always lower.

[0063] Fig. Figure 4 shows a comparison diagram of the sound loss indices for a single-point sound source and a double-point sound source at different frequencies according to some embodiments of the present application. The in Fig. Figure 4, a double-point sound source shown, which can also be called a dipole sound source, can represent a typical double-point sound source where the distance between them remains constant, the amplitude of the two point sound sources is the same, and the phases of the two point sound sources are out of phase. It is understood that the typical double-point sound source is used only to describe the principle and effect, and the parameters of the individual point sound sources can be adjusted as needed to differ from the typical double-point sound source. As shown in Fig. As shown in Figure 4, at a constant distance, the sound loss caused by the colony-point sound source increases with increasing frequency, while the ability to reduce sound loss decreases with increasing frequency. When the frequency exceeds a certain value (e.g., approximately 8000 Hz, as in Figure 4), the sound loss decreases with increasing frequency. Fig. (as shown in Figure 4), the resulting sound loss is greater than with a single point sound source. Therefore, this frequency (e.g., 8000 Hz) represents the upper limit to which the sound loss of the double point sound source can be reduced.

[0064] In some embodiments, a sound baffle can be arranged between the sound outlet opening 112 and the pressure relief opening 113 in order to improve the acoustic emission effect of the open-ear headphones 10, i.e. to increase the strength of the sound in a listening position in the near field, and at the same time to reduce the volume of sound loss in the far field.

[0065] Fig. Figure 5 shows a schematic representation of an exemplary distribution for a dipole sound source with a baffle arranged between two sound sources according to some embodiments of the present application. As in Fig. As shown in Figure 5, a baffle is provided between point sound source A1 and point sound source A2. The sound wave from point sound source A2 must first pass by the baffle in the near field before it can interfere with the sound wave from point sound source A1 at the listening position. This corresponds to an increase in the interval between point sound source A2 and the listening position. Therefore, it is assumed that point sound sources A1 and A2 have the same amplitude. Compared to a case without a baffle, the amplitude difference of the sound waves from point sound source A1 and point sound source A2 at the listening position then increases, thereby reducing the mutual cancellation of the sound from both sources at the listening position and thus increasing the loudness at the listening position.Compared to the case without a baffle, the sound loss in the far field cannot be significantly increased because the sound waves generated by point sound sources A1 and A2 can interfere with each other over a large area in the far field without passing through the baffle, similar to the case without a baffle. Therefore, by incorporating a baffle structure around point sound sources A1 and A2, the volume at the listening position in the near field can be significantly improved without substantially increasing the sound loss in the far field.

[0066] Fig. Figure 6 shows a diagram of the sound loss indices with respect to the dipole sound source with and without a baffle arranged between two sound sources, according to some embodiments of the present application. A baffle is added between the two point sound sources. This means that the distance between the two point sound sources in the near field is increased, that the loudness at the listening position in the near field is generated by a point sound source at a greater distance, and that the perceived loudness in the near field is significantly increased compared to the case without a baffle. In the far field, the sound field of the two point sound sources is only slightly affected by the baffle. This means that the sound loss is generated by a point sound source at a short distance. As shown in Fig. As shown in Figure 6, the sound loss index after adding the baffle is therefore significantly lower than without the baffle, i.e., at the same listening volume, the sound loss in the far field is lower than without the baffle, thus significantly improving the ability to reduce sound loss.

[0067] Fig. Figure 7 shows a schematic representation of the open-ear headphones in an exemplary worn state according to some embodiments of the present application. Fig. Figure 8 shows a schematic structural representation of one side of the open-ear headphones facing the ear. Fig. 7. Fig. Figure 9 shows a schematic structural representation of the housing of the open-ear headphones from Fig. 7.

[0068] As in Fig. As shown in Figure 7, the ear hook 12 is designed as an arc-shaped structure that rests against the connection area between the head and the ear 100 of the user. The sound-generating part 11 (or the housing 111 of the sound-generating part 11) can have a connecting end CE that is connected to the ear hook 12 and a free end FE that is separate from the ear hook 12.When the open-ear headphones 10 are worn, the first part 121 of the ear hook 12 (for example, the hook part of the ear hook 12) is suspended between the auricle (for example, the helix 107) and the head of a user, while the second part 122 of the ear hook 12 (for example, the connecting part of the ear hook) extends to a side of the auricle facing away from the head and is connected to the connecting end CE of the sound-generating part 11 in order to attach the sound-generating part 11 at a point where the sound-generating part is located near the ear canal without blocking the ear canal.

[0069] As in connection with Fig. 7 and Fig. As shown in Figure 8, the sound-generating part 11, when worn, can have, in the thickness direction Z, an inner surface IS facing the ear (also referred to as the inner surface of the housing 111), an outer surface OS facing away from the ear (also referred to as the outer surface of the housing 111), and a connecting surface linking the inner surface IS and the outer surface OS. It should be noted that, when worn and viewed in the direction of the coronal axis (i.e., in the thickness direction Z), the sound-generating part 11 can be in the shape of a circle, an oval, a rounded square, a rounded rectangle, etc. If the sound-generating part 11 is in the shape of a circle, an oval, etc., the connecting surface can refer to an arcuate side of the sound-generating part 11.If the sound-generating part 11 is shaped like a rounded square, a rounded rectangle, or in another shape, the connecting surface above can comprise a bottom surface LS (also referred to as the bottom of the housing 111), a top surface US (also referred to as the top of the housing 111), and a back surface RS (also referred to as the back of the housing 111), as described below. The top surface US and the bottom surface LS each refer to a side of the sound-generating part 11 facing away from the external auditory canal 101 and a side of the external auditory canal 101 located near it, respectively, in the Y direction of the short axis when worn. The back surface RS can be a side of the sound-generating part 11 facing the back of the head in the X direction when worn.To facilitate the description, the present description is exemplified using a sound-generating element 11 in the form of a rounded rectangle. The length of the sound-generating element 11 in the X direction of the long axis can be greater than the width of the sound-generating element 11 in the Y direction of the short axis. In some embodiments, the rear surface RS of the headphones can be shaped as an arc to improve the aesthetics and wearing comfort of the headphones.

[0070] Within the sound-generating part 11, the transducer can be arranged, which converts an electrical signal into a corresponding mechanical vibration, thereby generating sound. The transducer (for example, the diaphragm) can divide the housing 111 into the front chamber and the rear chamber of the earphone. The sound generated in the front chamber is out of phase with the sound generated in the rear chamber. A sound outlet opening 112 is provided on the inner surface IS to direct sound generated by the front chamber out of the housing 111 and then transmit it to the ear canal so that the user can hear the sound.On another side (for example, the outer surface OS, the top surface US, or the bottom surface LS, or the like) of the housing 111, one or more pressure relief openings 113 can be configured to communicate with the rear chamber so that sound generated in the rear chamber and derived from the housing 111, and sound emerging from the sound outlet opening 112, interfere with and cancel each other out in the far field. In some embodiments, the pressure relief opening 113 is arranged further away from the ear canal than the sound outlet opening 112 in order to attenuate the out-of-phase cancellation between sound emitted through the pressure relief opening 113 and sound emitted through the sound outlet opening 112 at a listening position (for example, the ear canal), and thus increase the loudness of the sound at the listening position.

[0071] In some embodiments, at least two pressure relief openings 113 may be provided on a side other than the inside IS of the housing 111 (for example, the outer side OS, the top side US, or the bottom side LS, or the like). By providing the at least two pressure relief openings 113, the standing wave in the rear chamber can be disrupted, so that the sound discharged from the housing 111 through the pressure relief openings 113 has the highest possible resonance frequency. This results in a broad and flat frequency response in the rear chamber (for example, a region before the resonance peak) and provides better sound loss reduction in the mid and high frequency range (for example, 2 kHz to 6 kHz).By way of example only, the pressure relief opening 113 can comprise a first pressure relief opening 1131 and a second pressure relief opening 1132. The second pressure relief opening 1132 can be located closer to the sound outlet opening 112 than the first pressure relief opening 1131. In some embodiments, the first pressure relief opening 1131 and the second pressure relief opening 1132 can be located on the same side of the housing 111. For example, the first pressure relief opening 1131 and the second pressure relief opening 1132 can be located simultaneously on the outer surface OS, the top surface US, or the bottom surface LS. In some embodiments, the first pressure relief opening 1131 and the second pressure relief opening 1132 can be located on two different sides of the housing 111.For example, the first pressure relief opening 1131 can be located on the outer surface OS and the second pressure relief opening 1132 on the upper surface US, or the first pressure relief opening 1131 on the outer surface OS and the second pressure relief opening 1132 on the lower surface LS. To maximize the destruction of the standing wave in the rear chamber, some embodiments provide for the two pressure relief openings 113 to be located on opposite sides of the housing 111. For example, the first pressure relief opening 1131 can be located on the upper surface US and the second pressure relief opening 1132 on the lower surface LS. To facilitate the description, the present description is based on an example arrangement in which the first pressure relief opening 1131 is located on the upper surface US and the second pressure relief opening 1132 on the lower surface LS.

[0072] To avoid the influence of the sound emitted through the first pressure relief opening 1131 and the second pressure relief opening 1132 on the loudness of the sound emitted through the sound outlet opening 112 at the listening position, some embodiments provide that the first pressure relief opening 1131 and the second pressure relief opening 1132 should be arranged as far away as possible from the sound outlet opening 112. For example, it is possible for the center of the sound outlet opening 112 to be located on a perpendicular plane or near the perpendicular plane of a line connecting the center of the first pressure relief opening 1131 with the center of the second pressure relief opening 1132.In some embodiments, the distance between the center of the sound outlet opening 112 and the perpendicular plane of the line connecting the center of the first pressure relief opening 1131 with the center of the second pressure relief opening 1132 can be 0 mm to 2 mm. To further prevent the out-of-phase cancellation of the sound emitted through the second pressure relief opening 1132 and the sound emitted through the sound outlet opening 112 in the ear canal (i.e., at the listening position), thus reducing the perceived loudness, some embodiments provide that the area of ​​the second pressure relief opening 1132 can be reduced. This reduces the intensity of the sound diverted through the second pressure relief opening 1132 and transmitted to the ear canal, whereby the area of ​​the second pressure relief opening 1132 can be smaller than the area of ​​the first pressure relief opening 1131 (as in [reference]). Fig. 16 shown).

[0073] As in Fig. As shown in Figure 7, in some embodiments the direction X of the long axis of the sound-generating part 11 is arranged horizontally or almost horizontally when the open-ear headphones 10 are worn (similar to the one shown in Figure 7). Fig. 2 (location C shown), wherein the sound-generating part 11 is located at least partially on the antihelix 105 and the free end FE of the sound-generating part 11 may face the back of the head. The sound-generating part 11 is in a horizontal or nearly horizontal position. Furthermore, the projection of direction X of the long axis of the sound-generating part 11 onto the sagittal plane may correspond to the direction of the sagittal axis, the projection of direction Y of the short axis onto the sagittal plane may correspond to the direction of the vertical axis, and the thickness direction Z is perpendicular to the sagittal plane.

[0074] In order to increase the adaptation of the open-ear headphones 10 to the ear 100 and the stability for wearing the open-ear headphones 10, in some embodiments it is provided that the inner surface IS of the housing 111 can rest against a surface of the ear 100 (for example the antihelix 105) in order to increase resistance against the open-ear headphones 10 falling out of the ear 100.

[0075] Combined with Fig. 7 and Fig. In some embodiments, it is provided that when the open-ear headphones 10 are placed on the ear 100, the projection of the sound outlet 112 onto the sagittal plane and the projection of an inwardly concave structure (for example, the cymba conchae 103) of the ear onto the sagittal plane can partially or completely coincide, so that the sound outlet 112 on the inner surface IS is not covered by ear tissue. Since the cymba conchae 103 communicates with the cavum conchae 102 and the ear canal is located within the cavum conchae 102, some embodiments provide that if the projection of the sound outlet 112 onto the sagittal plane lies at least partially within the cymba conchae 103, the sound emitted through the sound outlet 112 can reach the ear canal unhindered, thus increasing the volume received by the ear canal.In some embodiments, the dimension of the long axis of the sound-generating part 11 should not be too long, since an excessive length would cause the projection of the free end FE onto the sagittal plane to extend beyond the projection of the ear onto the sagittal plane, thereby impairing the impedance matching between the sound-generating part 11 and the ear. Therefore, the dimension of the long axis of the sound-generating part 11 can be designed such that the projection of the free end FE onto the sagittal plane does not extend beyond the projection of the helix 107 onto the sagittal plane.

[0076] It can be seen that the respective side walls of the housing 111 have a certain thickness because the sound outlet opening 112 and the pressure relief openings 113 (for example, the first pressure relief opening 1131 and the second pressure relief opening 1132) are provided on the housing 111. Thus, the sound outlet opening 112 and the pressure relief openings 113 are holes with a certain depth. In this case, the sound outlet opening 112 and the pressure relief opening 113 can each have inner and outer openings. To facilitate the description, the present application provides that the above or following center O of the sound outlet opening 112 can be the centroid of an outer opening of the sound outlet opening 112, and that the above or followingThe following centers of the pressure relief openings 113 may be the centroids of outer openings of the pressure relief openings 113. For example, the center O1 of the first pressure relief opening 1131 may be the centroid of an outer opening of the first pressure relief opening 1131, and the center O2 of the second pressure relief opening 1132 may be the centroid of an outer opening of the second pressure relief opening 1132.To facilitate the description, it is provided in the present description that the surfaces of the sound outlet opening 112 and the pressure relief openings 113 (for example, the first pressure relief opening 1131 and / or the second pressure relief opening 1132) can be the surfaces of the outer openings of the sound outlet opening 112 and the pressure relief openings 113, for example, the surface of the outer opening of the sound outlet opening 112 on the inside IS, the surface of the outer opening of the first pressure relief opening 1131 on the top US and the surface of the outer opening of the second pressure relief opening 1132 on the bottom LS.It can be seen that in some further embodiments it is provided that the areas of the sound outlet opening 112 and the pressure relief openings 113 can also be other cross-sectional areas of the sound outlet opening 112 and the pressure relief openings 113, for example the areas of inner openings of the sound outlet opening 112 and / or the pressure relief openings 113 or an average value of the areas of the inner openings and the outer openings of the sound outlet opening 112 and / or the pressure relief openings 113 or the like.

[0077] In some embodiments, the sound outlet opening 112, which communicates with the front chamber, is provided as the one in Fig. The point sound source A1 shown in Figure 5 can be considered to be that the pressure relief openings 113 (for example, the first pressure relief opening 1131 and / or the second pressure relief opening 1132), which are in communication with the rear chamber, are as shown in Figure 5. Fig. The point sound source A2 shown in section 5 can be considered, and the ear canal can be seen as the source in the image. Fig. The listening position shown in Figure 5 can be considered. At least part of the housing of the sound-generating part 11 and / or at least part of the auricle can be considered as shown in Figure 5. Fig. The baffle shown in Figure 5 is considered to increase the deviation of the interval from the sound outlet opening 112 and the first pressure relief opening 1131 and / or the second pressure relief opening 1132 to the ear canal, thereby increasing the sound intensity at the ear canal while maintaining the effect of reducing sound loss in the far field. If the open-ear headphone 10 is structurally as shown in Figure 5, the baffle will be used to increase the distance between the sound outlet opening 112 and the first pressure relief opening 1131 and / or the second pressure relief opening 1132, while maintaining the effect of reducing sound loss in the far field. Fig. As shown in Figure 7, i.e., the housing 111 is located at least partially on the antihelix 105, the sound wave from the sound outlet 112 can directly reach the ear canal with respect to its audible effect. The sound outlet 112 can be located in a position close to the underside LS on the inner side IS, and at least one of the pressure relief openings can be located in a position away from the sound outlet 112. For example, the first pressure relief opening 1131 can be located on the outer side OS or the upper side US, away from the sound outlet 112. The sound wave from the first pressure relief opening 1131 must pass by the outer side of the sound-generating part 11 in order to then interfere with the sound wave from the sound outlet 112 in the ear canal. Furthermore, convex or concave structures (e.g., the antihelix, the tragus, etc.) can...(along the propagation path) at the auricle, the interval for the transmission of sound from the first pressure relief opening 1131 to the ear canal is also increased. Thus, the sound-generating part 11 itself and / or at least a part of the auricle correspond to the sound baffle between the sound outlet opening 112 and the first pressure relief opening 1131. The sound baffle increases the interval from the first pressure relief opening 1131 to the ear canal and reduces the intensity of the sound wave emitted through the first pressure relief opening 1131 at the ear canal, so that the cancellation of the sound emitted through the sound outlet opening 112 and the first pressure relief opening 1131 at the ear canal is reduced, and thus the volume at the ear canal is increased.Regarding the effect of sound loss, the sound loss cannot be significantly increased because the sound waves generated by the sound outlet opening 112 and the first pressure relief opening 1131 and / or the second pressure relief opening 1132 can interfere with each other over a large area without passing by the sound-generating part 11 itself, similar to the case without a baffle. By arranging the sound outlet opening 112 and the first pressure relief opening 1131 and the second pressure relief opening 1132 in suitable positions, the volume at the ear canal can be considerably increased without significantly increasing the volume of sound loss.

[0078] In some embodiments, to facilitate production, the first pressure relief opening 1131 and the second pressure relief opening 1132 are provided with respect to the median plane of the long axis of the sound-generating part 11 (for example, as in Fig. The plane NN' (shown in Figure 8, which is oriented perpendicularly inwards to the drawing plane) can be distributed almost symmetrically if the projection of the free end FE onto the sagittal plane does not extend beyond the projection of the helix 107 onto the sagittal plane. In some embodiments, the deviation of the distance a2 between the center O2 of the second pressure relief opening 1132 on the underside LS and the rear side RS from the distance a1 between the center O1 of the first pressure relief opening 1131 on the top side US and the rear side RS is less than 10%. In some embodiments, the deviation of the distance a2 between the center O2 of the second pressure relief opening 1132 on the underside LS and the rear side RS from the distance a1 between the center O1 of the first pressure relief opening 1131 on the top side US and the rear side RS is less than 5%.In some embodiments, the deviation of the distance a2 between the center O2 of the second pressure relief opening 1132 on the underside LS and the back side RS from the distance a1 between the center O1 of the first pressure relief opening 1131 on the top side US and the back side RS is less than 2%. It can be seen that in some embodiments, the back side RS of the headphones may be shaped as an arc to improve the aesthetics and wearing comfort of the headphones. If the back side RS is shaped as an arc, the distance between a specific position (for example, the center O1 of the first pressure relief opening 1131) and the back side RS may be the distance between that position and the tangential surface of the back side RS, which runs parallel to the short axis.

[0079] In some embodiments, the sound outlet opening 112 is positioned close to the ear canal, allowing the second pressure relief opening 1132 on the underside LS to be located as far away as possible from the sound outlet opening 112. This is intended to dampen the cancellation effect of the sound emitted through the second pressure relief opening 1132 and the sound emitted through the sound outlet opening 112 at the listening position (i.e., the ear canal), thus increasing the volume at the listening position. If the sound outlet opening 112 is located near the underside LS and the connecting end CE, the second pressure relief opening 1132 can therefore be located near the rear side RS, maximizing the distance between the sound outlet opening 112 and the second pressure relief opening 1132.In some embodiments, the distance a2 between the center O2 of the second pressure relief opening 1132 and the rear side RS can range from 8.60 mm to 20.27 mm if the projection of the free end FE onto the sagittal plane does not extend beyond the projection of the helix 107 onto the sagittal plane. In some embodiments, the distance a2 between the center O2 of the second pressure relief opening 1132 and the rear side RS can range from 8.60 mm to 12.92 mm. In some embodiments, the distance a2 between the center O2 of the second pressure relief opening 1132 and the rear side RS can range from 9.60 mm to 11.92 mm.In some embodiments, the free end FE of the open-ear headphones 10 may be in contact with the ear (for example, the helix 107) when worn, so that the top surface US and / or the bottom surface LS are covered by the ear. To prevent the second pressure relief opening 1132 on the bottom surface LS (or the first pressure relief opening 1131 on the top surface US) from being covered by the ear 100 and thus affecting the acoustic performance of the open-ear headphones 10, the distance a2 between the center O2 of the second pressure relief opening 1132 and the rear surface RS can be in the range of 10.10 mm to 11.42 mm. Preferably, the distance a2 between the center O2 of the second pressure relief opening 1132 and the rear surface RS can be in the range of 10.30 mm to 11.12 mm.Preferably, the distance a2 between the center O2 of the second pressure relief opening 1132 and the rear side RS can be in the range of 10.60 mm to 11.82 mm.

[0080] In some embodiments, the distance a1 between the center O1 of the first pressure relief opening 1131 and the rear side RS can range from 8.60 mm to 15.68 mm, provided that the deviation of the distance a2 between the center O2 of the second pressure relief opening 1132 and the rear side RS from the distance a1 between the center O1 of the first pressure relief opening 1131 and the rear side RS is less than 10%. In some embodiments, the distance a1 between the center O1 of the first pressure relief opening 1131 and the rear side RS can range from 8.60 mm to 12.92 mm.In some embodiments, the distance a1 between the center O1 of the first pressure relief opening 1131 and the rear surface RS can be in the range of 9.60 mm to 11.92 mm, so that the projection of the first pressure relief opening 1131 onto the sagittal plane and the projection of the inwardly recessed structure of the ear onto the sagittal plane can largely coincide. Preferably, the distance a1 between the center O1 of the first pressure relief opening 1131 and the rear surface RS can be in the range of 10.10 mm to 11.42 mm. More preferably, the distance a1 between the center O1 of the first pressure relief opening 1131 and the rear surface RS can be in the range of 10.30 mm to 11.12 mm. Preferably, the distance a1 between the center O1 of the first pressure relief opening 1131 and the rear side RS can be in the range of 10.60 mm to 11.82 mm.

[0081] In some embodiments, the first pressure relief opening 1131 can be located further away from the sound outlet opening 112 than the second pressure relief opening 1132, and the sound generated by the first pressure relief opening 1131 is more difficult to transmit to the ear canal compared to the second pressure relief opening 1132 because the gap between the ear 100 and the inner surface IS is small. Therefore, in some embodiments, the distance between the center O1 of the first pressure relief opening 1131 and the rear surface RS can be smaller than the distance between the center O2 of the second pressure relief opening 1132 and the rear surface RS.For example, it is provided that the distance between the center O1 of the first pressure relief opening 1131 and the rear RS is in the range of 10.44 mm to 15.68 mm, and that the distance between the center O2 of the second pressure relief opening 1132 and the rear RS is in the range of 13.51 mm to 20.27 mm.

[0082] With reference to Fig. In some embodiments, it is provided that the dimension of the open-ear headphone 10 in the thickness direction Z can be increased to enlarge the interval from the first pressure relief opening 1131 and / or the second pressure relief opening 1132 to the ear canal, thereby increasing the sound generation power of the open-ear headphone 10 (i.e., the volume of the sound in the listening position). Furthermore, it is provided that the first pressure relief opening 1131 and / or the second pressure relief opening 1132 can be arranged further away from the inner surface IS to further enlarge the interval from the first pressure relief opening 1131 and / or the second pressure relief opening 1132 to the ear canal and to increase the sound generation power of the open-ear headphone 10.Furthermore, the overall dimensions of the sound-generating element 11 cannot be defined as too large; for example, the dimensions of the sound-generating element 11 in the Z-direction should not be too large, otherwise the overall mass of the open-ear headphones 10 could be increased, thus affecting wearing comfort. In some embodiments, the distance d1 between the center O1 of the first pressure relief opening 1131 and the inner surface IS is in the range of 4.24 mm to 7.96 mm. In some embodiments, the distance d1 between the center O1 of the first pressure relief opening 1131 and the inner surface IS is in the range of 4.43 mm to 7.96 mm. In some embodiments, the distance d1 between the center O1 of the first pressure relief opening 1131 and the inner surface IS is in the range of 5.43 mm to 6.96 mm.In some embodiments, the first pressure relief opening 1131 and / or the second pressure relief opening 1132 can be positioned far from the inner surface IS when worn. This allows the projection of the first pressure relief opening 1131 onto the horizontal plane to coincide less with, or not coincide at all with, the projection of the ear 100 onto the horizontal plane. This enables the sound emitted through the first pressure relief opening 1131 and / or the second pressure relief opening 1132 to be radiated more outwards, instead of being transmitted to the ear canal or, after reflection or refraction at certain structures (e.g., the auricle) of the ear 100, being transmitted to the ear canal. Such an arrangement also makes it possible to further increase the distance between the first pressure relief opening 1131 and / or the second pressure relief opening 1132 and the ear canal, thereby increasing the sound generation power of the open-ear headphones 10.In some embodiments, the distance d1 between the center O1 of the first pressure relief opening 1131 and the inner surface IS is in the range of 5.63 mm to 7.96 mm. In some embodiments, the distance d1 between the center O1 of the first pressure relief opening 1131 and the inner surface IS is in the range of 6.25 mm to 7.56 mm.

[0083] In some embodiments, the distance d2 between the center O2 of the second pressure relief opening 1132 and the inner surface IS can be the same as the distance d1 between the center O1 of the first pressure relief opening 1131 and the inner surface IS. In some embodiments, the distance d2 between the center O2 of the second pressure relief opening 1132 and the inner surface IS is in the range of 4.43 mm to 7.96 mm. In some embodiments, the distance d2 between the center O2 of the second pressure relief opening 1132 and the inner surface IS is in the range of 5.43 mm to 6.96 mm. In some embodiments, the distance d2 between the center O2 of the second pressure relief opening 1132 and the inner surface IS is in the range of 5.63 mm to 7.96 mm.In some embodiments, the distance d2 between the center O2 of the second pressure relief opening 1132 and the inside IS is in the range of 6.25 mm to 7.56 mm.

[0084] In some embodiments, the sound outlet opening 112 is positioned near the underside LS to bring it closer to the ear canal and thus increase the listening position. In this case, the second pressure relief opening 1132 is located closer to the inner surface IS than the first pressure relief opening 1131. To reduce the cancellation effect of the sound emitted through the second pressure relief opening 1132 and the sound emitted through the first sound outlet opening 112 at the listening position (i.e., the ear canal), and thus increase the volume at the listening position, the second pressure relief opening 1132 can be located further away from the inner surface IS than the first pressure relief opening 1131 in the Z-direction.This means that the distance d2 between the center O2 of the second pressure relief opening 1132 and the inner surface IS, and the distance d1 between the center O1 of the first pressure relief opening 1131 and the inner surface IS, can be different. For example, the distance d1 between the center O1 of the first pressure relief opening 1131 and the inner surface IS is specified to be in the range of 5.63 mm to 6.5 mm, and the distance d2 between the center O2 of the second pressure relief opening 1132 and the inner surface IS is specified to be in the range of 6.5 mm to 7.56 mm.

[0085] The description of the above open-ear headphone 10 serves only for illustrative purposes and is not intended to limit the scope of this application. Various changes and modifications can be made by the person skilled in the art, as described in this application. For example, if only one pressure relief opening is provided on the sound-generating part 11, the pressure relief opening can be any of the first pressure relief openings 1131 and 1132. For instance, the pressure relief opening could be the first pressure relief opening 1131 mentioned above. That is, the pressure relief opening could be located on the top surface US.It is provided that the distance between the center of the pressure relief opening and the inner surface IS can range from 4.24 mm to 7.96 mm, and that the distance between the center of the pressure relief opening and the rear surface RS can range from 8.60 mm to 15.68 mm. These changes and modifications fall within the scope of protection of the present application.

[0086] In some embodiments, it is provided that a chamber structure can be formed around one of the sound sources of the double-point sound source in order to enable an increase in loudness during listening, particularly in the mid and low frequency range, while simultaneously preserving the effect of cancellation for sound loss in the far field. Fig. Figure 10 shows a schematic representation of an exemplary distribution of a dipole sound source with a chamber structure arranged around one of the sound sources according to some embodiments of the present application.

[0087] As in Fig. As shown in Figure 10, a chamber structure 41 is arranged between the dipole sound sources such that one of the dipole sound sources and the listening position are located inside the chamber structure 41, while the other dipole sound source is located outside the chamber structure 41. Sound emitted by the dipole sound source inside the chamber structure 41 can be limited by the chamber structure 41; that is, the chamber structure 41 can focus the sound. This allows more sound to be transmitted to the listening position, thus improving the volume and sound quality of the sound heard at the listening position.In the present application, the “chamber structure” can be understood as a partially enclosed structure jointly enclosed by the side wall of the sound-generating part 11 and the structure of the cavum conchae, wherein the partially enclosed structure does not completely seal the interior from the external environment, but rather has a leakage structure 42 (for example, an opening, a gap, a tube, or the like) that is in acoustic communication with the external environment. An exemplary leakage structure may include, but is not limited to, an opening, a gap, a tube, and the like, or any combination thereof.

[0088] In some embodiments, the chamber structure 41 can contain a listening position and at least one sound source. Here, the term "contains" can mean that either the listening position or the sound source is located inside the chamber, or that either the listening position or the sound source is located at the inner edge of the chamber. In some embodiments, the listening position can also be located at the entrance of the ear canal or at an acoustic reference point of the ear.

[0089] Fig. Figure 11A shows a schematic representation of a principle of hearing in a structure of a dipole sound source and a chamber structure formed around one of the sound sources of the dipole sound source according to some embodiments of the present application. Fig. Figure 11B shows a schematic representation of a sound loss principle in a structure of a dipole sound source and a chamber structure formed around one of the sound sources of the dipole sound source according to some embodiments of the present application.

[0090] Regarding near-field hearing, a dipole of the chamber structure around one of the in Fig. The sound sources shown in Figure 11A are formed around the chamber structure. Because one of the sound sources A is enclosed by the chamber structure, the sound emitted from it mostly reaches the listening position through direct radiation or reflection. In contrast, most of the sound emitted by the other sound source cannot reach the listening position without the chamber structure. Therefore, the chamber structure significantly increases the volume of the sound that reaches the listening position. At the same time, only a small portion of the out-of-phase sound emitted by the out-of-phase sound source B outside the chamber structure enters the chamber structure through the leakage structure. This means that a secondary sound source B' is created at the leakage structure, the intensity of which is significantly lower than that of sound sources A and B.The sound generated by the secondary sound source B' causes a weak antiphase cancellation in the chamber with respect to the sound source A, which significantly increases the volume at the listening position.

[0091] As in Fig. As shown in Figure 11B, with regard to sound loss, it is assumed that the sound radiated from sound source A to the outside environment via the leakage structure of the chamber corresponds to a secondary sound source A' generated at the leakage structure. Since almost all the sound radiated from sound source A is emitted through the leakage structure, and the structural dimension of the chamber is much smaller than the room dimension used for evaluating sound loss (by at least one order of magnitude), it can be assumed that the magnitude of a secondary sound source A' is equal to that of sound source A. For the outside environment, the effect of the cancellation of the sound generated by the secondary sound source A' against the sound generated by sound source B is equivalent to the effect of the cancellation of the sound generated by sound source A against the sound generated by sound source B.This means that the chamber structure retains a comparable effect in reducing sound loss.

[0092] It is understood that the above leakage structure with one opening is only exemplary. The leakage structure of the chamber structure can have one or more openings and also enable an optimal audibility index, where the audibility index can be related to the reciprocal 1 / α of the sound loss index α. Using the example of a structure with two openings, the cases of identical openings and the same opening rate are analyzed below. In comparison to a structure with a single opening, the term "identical openings" here means that two openings whose dimensions are identical to those of the structure with a single opening are provided, while the term "same opening rate" means that the sum of the opening areas of the two openings corresponds to the opening area of ​​the structure with a single opening. The identical openings correspond to a doubling of the relative opening size of the single opening (i.e.,(a doubling of the ratio between the opening area S of the leakage structure of the chamber structure and the area S0, which is directly exposed to the sound source contained within the chamber structure), whereby, according to the description above, the overall audibility index can be reduced. Even with the same opening rate, different distances of the two openings to the external sound source lead to different audibility indices, even if the S / S0 is identical to that of the structure with a single opening.

[0093] Fig. Figure 12A shows a schematic representation of the chamber structure with two horizontal openings according to some embodiments of the present application. Fig. Figure 12B shows a schematic representation of the chamber structure with two vertical openings according to some embodiments of the present application. If two connecting lines of the openings and two connecting lines of the sound sources run parallel to each other (i.e., two horizontal openings), the distances from the two openings to the external sound source are assumed to be maximum and minimum, respectively, as shown in Fig. 12A is shown. If two connecting lines run vertically (i.e., two vertical openings), the distances from the two openings to the external sound source are equal, and an average value is assumed, as shown in Fig. 12B shown.

[0094] Fig. Figure 13 shows a comparison diagram of audibility index curves for chamber structures with two openings and one opening, respectively, according to some embodiments of the present application. As in Fig. As shown in Figure 13, the overall audibility index is reduced for chamber structures with identical openings compared to a chamber structure with a single opening. For a chamber structure with the same opening rate, the different distances of the two openings to the external sound source also lead to different audibility indices. This is in conjunction with Fig. 12A, Fig. 12B and Fig. 13. It is evident that the audibility index of the leakage structures with the same opening rate is higher than that of the leakage structures with identical openings, regardless of whether the openings are horizontal or vertical. This is because, in the leakage structure with the same opening rate, the relative opening size S / S0 is reduced by half compared to the leakage structure with identical openings, thus increasing the audibility index. This is in conjunction with Fig. 12A, Fig. 12B and Fig. 13. It is also evident that the audibility index is higher for horizontal openings, regardless of whether the leakage structure has identical openings or the same opening rate. This is because, in the leakage structure with horizontal openings, the distance of one of the openings to the external sound source is smaller than the distance between the two sound sources. As a result, the secondary sound source and the external sound source are closer together than the two original sound sources. Therefore, the audibility index is higher, and the effect on reducing sound loss is further improved. To improve the effect on reducing sound loss, the distance of at least one opening to the external sound source can therefore be smaller than the distance between the two sound sources.

[0095] As in Fig. As shown in Figure 13, it is further intended that the air acoustic resonance frequency within the chamber structure can be increased more effectively by a chamber structure with two openings than by a chamber structure with a single opening, so that the entire device exhibits a better audibility index in a high-frequency band (for example, sound with a frequency close to 10,000 Hz) than a chamber structure with only one opening. The human ear is more sensitive to the high-frequency band, therefore there is a greater need to reduce sound loss in this band. To improve the effectiveness in reducing sound loss in the high-frequency band, a chamber structure with more than one opening can therefore be selected.

[0096] Fig. Figure 14 shows a schematic representation of the open-ear headphones in an exemplary worn state according to some further embodiments of the present application. Fig. Figure 15 shows a schematic structural representation of one side of the open-ear headphones facing the ear. Fig. 14.

[0097] The in Fig. 14 of the open-ear headphones shown, 10 of which has a similar structure to that of the one in Fig. Figure 7 shows an open-ear headphone 10. For example, the ear hook 12 is designed as an arc-shaped structure that rests against the connection area between the head and the ear 100 of the user. The sound-generating part 11 (or the housing 111 of the sound-generating part 11) can have a connecting end CE that is connected to the ear hook 12 and a free end FE that is separate from the ear hook 12.When the open-ear headphones 10 are worn, the first part 121 of the ear hook 12 (for example, the hook part of the ear hook 12) is suspended between the auricle (for example, the helix 107) and the user's head, while the second part 122 of the ear hook 12 (for example, the connecting part of the ear hook) extends to a side of the auricle facing away from the head and is connected to the connecting end CE of the sound-generating part 11 in order to attach the sound-generating part 11 at a location near the ear canal without obstructing it. Fig. 14 of the open-ear headphones shown, 10 of which has a similar structure to that of the one in Fig. The open-ear headphones 10 shown in Figure 7 differ significantly in that the sound-generating element 11 is angled, and the housing 111 of the sound-generating element 11 is at least partially inserted into the concha 102. For example, the free end FE of the sound-generating element 11 can project into the concha 102. The ear hook 12 and the sound-generating element 11, designed in this way, adapt well to the user's ear 100 and can increase the resistance to the open-ear headphones 10 falling out of the ear 100, thus increasing the stability of the open-ear headphones 10 when worn.

[0098] In some embodiments, when worn, the connecting end CE of the sound-generating part 11 is positioned closer to the top of the head than the free end FE when viewed in the thickness direction Z, in order to facilitate the insertion of the free end FE into the conchal cavity. Based on this, the angle between the direction Y of the short axis and the direction of the sagittal axis of the human body can be between 30° and 40°. If this angle is too small, the free end FE may not be able to insert into the conchal cavity, and the sound outlet opening 112 on the sound-generating part 11 may be too far from the ear canal. If this angle is too large, the sound-generating part 11 may also not be able to insert into the conchal cavity, and the ear canal may be blocked by the sound-generating part 11.In other words, this design allows both the sound-generating part 11 to protrude into the concha and ensures an adequate distance between the sound outlet opening 112 on the sound-generating part 11 and the ear canal. This allows the user to receive more of the sound generated by the sound-generating part 11 without obstructing the ear canal.

[0099] In some embodiments, the sound-generating element 11 and the ear hook 12 can jointly clamp the aforementioned ear area from both the front and back of the ear area corresponding to the conchal cavity (cavum conchae) to increase the resistance against the open-ear headphones 10 falling out of the ear and thus improve the stability of the open-ear headphones 10 when worn. For example, the free end FE of the sound-generating element 11 is pressed into the conchal cavity in the thickness direction Z. Alternatively, the free end FE may lie against the inside of the conchal cavity in the X direction of the long axis and in the Y direction of the short axis.

[0100] In some embodiments, it is provided that both ends of the second part 122 of the ear hook 12 can each be connected to the first part 121 of the ear hook 12 and the connecting end CE of the sound-generating part 11, as shown in Fig. Figure 15 shows that in some embodiments, the second part 122 of the ear hook 12 may have a lowest point P and a highest point Q in the Y direction of the short axis of the sound-generating part 11. When the open-ear headphones 10 are worn, the distance h1 between the center of the first pressure relief opening 1131 and the lowest point P in the X direction of the long axis of the sound-generating part 11 may be 5.28 mm to 7.92 mm to ensure that the first pressure relief opening 1131 is not obstructed by a structure (for example, the helix or the tragus) of the ear. In some embodiments, it is provided that a distance h2 between the center of the first pressure relief opening 1131 and the highest point Q in the direction X of the long axis of the sound generating part 11 can be 8.68 mm to 13.02 mm, so that when the open-ear headphones 10 are worn by the user, the headphones can rest against the user's ear.In some embodiments, the distance between the center of the first pressure relief opening 1131 and any point on the second part 122 of the ear hook 12 in the X direction of the long axis of the sound-generating part 11, when worn by the user, is in the range of 5.28 mm to 14 mm. In some embodiments, the distance between the center of the first pressure relief opening 1131 and any point on the second part 122 of the ear hook in the X direction of the long axis of the sound-generating part 11 is in the range of 5.28 mm to 13.02 mm. In some embodiments, the distance between the center of the first pressure relief opening 1131 and any point on the second part 122 of the ear hook in the X direction of the long axis of the sound-generating part 11 is in the range of 6.58 mm to 12.02 mm.In some embodiments, the distance between the center of the first pressure relief opening 1131 and any point on the second part 122 of the ear hook, in the X direction of the long axis of the sound-generating part 11, is in the range of 7.58 mm to 10.02 mm. In some embodiments, the distance between the center of the first pressure relief opening 1131 and any point on the second part 122 of the ear hook, in the X direction of the long axis of the sound-generating part 11, is in the range of 8.58 mm to 9.02 mm.

[0101] As in Fig. As shown in Figure 14, in the user-worn open-ear headphones 10, the housing 111 of the sound-generating part 11 is arranged such that it is at least partially inserted into the caveum conchae 103, whereby the chamber enclosed jointly by the inner surface IS of the sound-generating part 11 and the caveum conchae 103 is described as being in Fig. 10 chamber structure shown 41 can be considered and the gap formed between the inner surface IS and the cavum conchae (for example, the first leakage structure UC, which is formed near the top of the head between the inner surface IS and the cavum conchae, or the second leakage structure LC, which is formed near the ear canal between the inner surface IS and the ear) can be considered as the one in Fig. Leakage structure 42 shown in Figure 10 can be considered. The sound outlet opening 112 provided on the inside IS can be considered a point sound source within the structure shown in Figure 10. Fig. The chamber structure 41 shown in Figure 10 can be considered. The pressure relief openings 113 (for example, the first pressure relief opening 1131 and the second pressure relief opening 1132) provided on another side (for example, the top US and / or the bottom LS) of the sound-generating part 11 can be considered as a point sound source outside the chamber structure shown in Figure 10. Fig. The chamber structure shown in Figure 41 is considered. Based on a relevant description using... Fig. 10 to 13, with regard to the effect of hearing, it is provided that the sound emitted from the sound outlet opening 112 usually reaches the ear canal by direct radiation or reflection, and thus the volume of the sound reaching the ear canal, in particular the volume of hearing at mid or low frequencies, can be significantly increased if the open-ear headphones 10 are worn at least partially inserted into the cavum conchae, as shown in the illustration. Fig. The device is worn as shown in Figure 14. Simultaneously, only a small portion of the out-of-phase sound emitted from the pressure relief openings 113 (for example, the first pressure relief opening 1131 and the second pressure relief opening 1132) enters the concha through the gap (the first leakage structure UC and the second leakage structure LC). The out-of-phase cancellation of this sound and the sound generated by the sound outlet opening 112 is weak, thus significantly increasing the perceived loudness at the ear canal. Regarding the reduction of sound loss, the sound outlet opening 112 is designed to release the sound through the gap to the outside environment and to cancel out the sound generated by the pressure relief openings 113 (for example, the first pressure relief opening 1131 and the second pressure relief opening 1132) in the far field, thereby ensuring the reduction of sound loss.

[0102] In some embodiments, the first pressure relief opening 1131 and the second pressure relief opening 1132 are arranged offset in the X-direction so that the tragus does not obscure them. In some embodiments, the distance between the center O1 of the first pressure relief opening 1131 and the center O2 of the second pressure relief opening 1132 can be between 7 mm and 15.2 mm. In some embodiments, the distance between the center O1 of the first pressure relief opening 1131 and the center O2 of the second pressure relief opening 1132 can be between 8 mm and 13 mm. In some embodiments, the distance between the center O1 of the first pressure relief opening 1131 and the center O2 of the second pressure relief opening 1132 can be 12.64 mm.In some embodiments, the distance between the center O1 of the first pressure relief opening 1131 and the center O2 of the second pressure relief opening 1132 can be 7.5 mm to 14 mm. In some embodiments, the distance between the center O1 of the first pressure relief opening 1131 and the center O2 of the second pressure relief opening 1132 can be 12 mm to 13 mm. In some embodiments, the distance between the center O1 of the first pressure relief opening 1131 and the center O2 of the second pressure relief opening 1132 can be 13 mm to 15.2 mm.

[0103] To avoid the influence of the sound emitted through the first pressure relief opening 1131 and the second pressure relief opening 1132 on the loudness of the sound emitted through the sound outlet opening 112 at the listening position, some embodiments provide that the first pressure relief opening 1131 and the second pressure relief opening 1132 should be arranged as far away as possible from the sound outlet opening 112. For example, it is possible for the center of the sound outlet opening 112 to be located on a perpendicular plane or near the perpendicular plane of a line connecting the center of the first pressure relief opening 1131 with the center of the second pressure relief opening 1132.

[0104] In some embodiments, the relationship between the distance between the center O1 of the first pressure relief opening 1131 and the center O of the sound outlet opening 112 (also referred to as the first distance) and the distance between the center O2 of the second pressure relief opening 1132 and the center O of the sound outlet opening 112 (also referred to as the second distance) can be determined such that the center O of the sound outlet opening 112 lies almost in the perpendicular plane of the connecting line 0102. In some embodiments, the deviation of the first distance from the second distance is less than 10%. In some embodiments, the deviation of the first distance from the second distance is less than 8%. In some embodiments, the deviation of the first distance from the second distance is less than 5%.In some embodiments, it is provided that the deviation of the first distance from the second distance is less than 2%.

[0105] In some embodiments, the distance between the first pressure relief opening 1131 or the second pressure relief opening 1132 and the sound outlet opening 112 should not be too close, in order to prevent the user's hearing quality from being affected by the near-field cancellation of the sound wave emitted through the pressure relief openings (for example, the first pressure relief opening 1131 and the second pressure relief opening 1132) and the sound wave emitted through the sound outlet opening 112. In some embodiments, the distance between the center O1 of the first pressure relief opening 1131 and the center O of the sound outlet opening 1124 mm can be up to 15.11 mm. In some embodiments, the distance between the center O1 of the first pressure relief opening 1131 and the center O of the sound outlet opening 112 can be 4 mm to 15 mm.In some embodiments, the distance between the center O1 of the first pressure relief opening 1131 and the center O of the sound outlet opening 112 can be between 5.12 mm and 15.11 mm. In some embodiments, the distance between the center O1 of the first pressure relief opening 1131 and the center O of the sound outlet opening 112 cannot be less than 5 mm to 14 mm. In some embodiments, the distance between the center O1 of the first pressure relief opening 1131 and the center O of the sound outlet opening 112 cannot be less than 6 mm to 13 mm. In some embodiments, the distance between the center O1 of the first pressure relief opening 1131 and the center O of the sound outlet opening 112 cannot be less than 7 mm to 12 mm.In some embodiments, the distance between the center O1 of the first pressure relief opening 1131 and the center O of the sound outlet opening 112 is specified as no less than 8 mm to 10 mm. In some embodiments, the distance between the center O1 of the first pressure relief opening 1131 and the center O of the sound outlet opening 112 is specified as 9.55 mm. In some embodiments, the distance between the center O2 of the second pressure relief opening 1132 and the center O of the sound outlet opening 112 is specified as 4 mm to 16.1 mm. In some embodiments, the distance between the center O2 of the second pressure relief opening 1132 and the center O of the sound outlet opening 112 is specified as no less than 4 mm to 15 mm.In some embodiments, the distance between the center O2 of the second pressure relief opening 1132 and the center O of the sound outlet opening 112 is specified as being no less than 5 mm to 14 mm. In some embodiments, the distance between the center O2 of the second pressure relief opening 1132 and the center O of the sound outlet opening 112 is specified as being 5.12 mm to 16.1 mm. In some embodiments, the distance between the center O2 of the second pressure relief opening 1132 and the center O of the sound outlet opening 112 is specified as being no less than 6 mm to 13 mm. In some embodiments, the distance between the center O2 of the second pressure relief opening 1132 and the center O of the sound outlet opening 112 is specified as being no less than 7 mm to 12 mm.In some embodiments, the distance between the center O2 of the second pressure relief opening 1132 and the center O of the sound outlet opening 112 is specified as being no less than 8 mm to 10 mm. In some embodiments, the distance between the center O2 of the second pressure relief opening 1132 and the center O of the sound outlet opening 112 is specified as being 9.15 mm.

[0106] To maximize the distance between the first pressure relief opening 1131, the second pressure relief opening 1132, and the sound outlet opening 112, the angle between the connecting line O1O from the center O1 of the first pressure relief opening 1131 to the center O of the sound outlet opening 112, and the connecting line O2O from the center O2 of the second pressure relief opening 1132 to the center O of the sound outlet opening 112, can be reduced in some embodiments. In some embodiments, the angle between the connecting line O1O and the connecting line O2O is in the range of 46.40° to 114.04°. In some embodiments, the angle between the connecting line O1O and the connecting line O2O is in the range of 46.40° to 90.40°.In some embodiments, the angle between connecting line O1O and connecting line O2O is in the range of 46.40° to 70.04°. In some embodiments, the angle between connecting line O1O and connecting line O2O is in the range of 46.40° to 60.04°. In some embodiments, the angle between connecting line O1O2 (center O1 of the first pressure relief opening 1131) and center O2 (center O2 of the second pressure relief opening 1132) and connecting line O2O is in the range of 19.72° to 101.16°. In some embodiments, the angle between connecting line O1O2 and connecting line O2O is in the range of 19.71° to 97.75°.

[0107] In some embodiments, the first pressure relief opening 1131 is located further from the connection end CE than the second pressure relief opening 1132. Since the center of the sound outlet opening 112 lies in or near the perpendicular plane of the line connecting the center of the first pressure relief opening 1131 with the center of the second pressure relief opening 1132, the sound outlet opening 112 is located on a side of the housing 111 in the Y-direction that is close to the second pressure relief opening 1132, instead of in the center position (as in Fig. (Figure 16). Since the sound outlet opening 112 is located near the ear canal, the second pressure relief opening 1132 is closer to the ear canal, and the first pressure relief opening 1131 is farther away. Compared to the first pressure relief opening 1131, the sound wave propagated from the second pressure relief opening 1132 is more easily canceled out in the near field by the sound wave propagated from the sound outlet opening 112. Consequently, the dimensions of the second pressure relief opening 1132 can be smaller than those of the first pressure relief opening 1131 in order to reduce sound loss from the second pressure relief opening 1132. That is, the area of ​​the second pressure relief opening 1132 can be smaller than the area of ​​the first pressure relief opening 1131.To ensure that the frequency response curves of the first pressure relief opening 1131 and the second pressure relief opening 1132 are as close as possible for optimal sound cancellation, some embodiments stipulate that the deviation of the area of ​​the first pressure relief opening 1131 from that of the second pressure relief opening 1132 should not be too large. In some embodiments, the ratio of the area of ​​the inner opening of the second pressure relief opening 1132 to the area of ​​the inner opening of the first pressure relief opening 1131 is not greater than 0.9. In some embodiments, the ratio of the area of ​​the inner opening of the second pressure relief opening 1132 to the area of ​​the inner opening of the first pressure relief opening 1131 is not greater than 0.8.In some embodiments, the ratio of the area of ​​the inner opening of the second pressure relief opening 1132 to the area of ​​the inner opening of the first pressure relief opening 1131 is not greater than 0.7. In some embodiments, the ratio of the area of ​​the inner opening of the second pressure relief opening 1132 to the area of ​​the inner opening of the first pressure relief opening 1131 is not greater than 0.6. In some embodiments, the ratio of the area of ​​the inner opening of the second pressure relief opening 1132 to the area of ​​the inner opening of the first pressure relief opening 1131 may be 0.55.

[0108] In some embodiments, the sound outlet opening 112 can, for example, be used in the design of Fig. 14 closer to the lower end of the sound-generating part 11 in the Y-direction, i.e. on the underside LS, where the second pressure relief opening 1132 is located (as in Fig. (as shown in Figure 16) should be arranged so that the sound outlet 112 is closer to the user's ear canal. In this case, the distance between the sound outlet 112 and the first pressure relief opening 1131 in the Y-direction is greater than the distance between the sound outlet 112 and the second pressure relief opening 1132 in the Y-direction. This prevents the sound waves emitted by the sound outlet 112 and the first pressure relief opening 1131 from canceling each other out in the near field. This helps to increase the volume of the sound emitted by the sound outlet 112 that the user hears.Accordingly, the second pressure relief opening 1132 is located closer to the connection end CE than the sound outlet opening 112 in order to increase the distance between the two in the X direction and thus prevent the sound waves emitted by the sound outlet opening 112 and the second pressure relief opening 1132 from canceling each other out of phase in the near field. This helps to increase the volume of the sound emitted by the sound outlet opening 112 that the user hears.In some embodiments, it is provided that the value of the deviation of the distance between the center O of the sound outlet opening 112 and the center O1 of the first pressure relief opening 1131 in the Y-direction from the distance between the center O of the sound outlet opening 112 and the center O2 of the second pressure relief opening 1132 can be 2 mm to 10 mm, and that the value of the deviation of the distance between the center O2 of the second pressure relief opening 1132 and the connection end CE in the X-direction from the distance between the center O of the sound outlet opening 112 and the connection end CE can be 2 mm to 15 mm.In some embodiments, it is provided that the value of the deviation of the distance between the center O of the sound outlet opening 112 and the center O1 of the first pressure relief opening 1131 in the Y-direction from the distance between the center O of the sound outlet opening 112 and the center O2 of the second pressure relief opening 1132 can be 3 mm to 9 mm, and that the value of the deviation of the distance between the center O2 of the second pressure relief opening 1132 and the connection end CE in the X-direction from the distance between the center O of the sound outlet opening 112 and the connection end CE can be 4 mm to 12 mm.In some embodiments, the deviation of the distance between the center O of the sound outlet opening 112 and the center O1 of the first pressure relief opening 1131 in the Y-direction from the distance between the center O of the sound outlet opening 112 and the center O2 of the second pressure relief opening 1132 can be 5 mm to 7 mm, and the deviation of the distance between the center O2 of the second pressure relief opening 1132 and the connection end CE in the X-direction from the distance between the center O of the sound outlet opening 112 and the connection end CE can be 6 mm to 8 mm. It can be seen that if a side of the housing 111 corresponding to the connection end CE represents an arc, the distance between a certain position (e.g.,the center O1 of the first pressure relief opening 1131 or the center O2 of the second pressure relief opening 1132) and the connection end CE (or to this side) can be a distance between this position and a tangential surface parallel to the short axis at the connection end CE.

[0109] Combined with Fig. 14 and Fig. In some embodiments, it is provided that the dimension of the long axis of the sound-generating part 11 should not be too large, so that the sound-generating part 11 is at least partially inserted into the cavity. Provided that the insertion of at least part of the sound-generating part 11 into the cavity is ensured, the distance between the first pressure relief opening 1131 or the second pressure relief opening 1132 and the rear side RS of the sound-generating part 11 cannot be too small, otherwise the total area or part thereof of the first pressure relief opening 1131 and / or the second pressure relief opening 1132 in the X-direction would be obscured due to the free end FE contacting the wall surface of the cavity, thus reducing the effective area of ​​the first pressure relief opening 1131 and / or the second pressure relief opening 1132.In some embodiments, the distance a3 between the center O1 of the first pressure relief opening 1131 and the rear side RS is in the range of 8.60 mm to 15.68 mm. In some embodiments, the distance a3 between the center O1 of the first pressure relief opening 1131 and the rear side RS is in the range of 10.44 mm to 15.68 mm. In some embodiments, the distance a3 between the center O1 of the first pressure relief opening 1131 and the rear side RS is in the range of 11.00 mm to 14.55 mm. In some embodiments, the distance a3 between the center O1 of the first pressure relief opening 1131 and the rear side RS is in the range of 12.15 mm to 13.25 mm.

[0110] Furthermore, in connection with Fig. 16. It is provided that the distance between the center O1 of the first pressure relief opening 1131 and the inner surface IS of the sound-generating part 11 in the Z-direction should not be too small in order to prevent the total area or part thereof of the first pressure relief opening 1131 and / or the second pressure relief opening 1132 from being obscured in the Z-direction, thus reducing the effective area of ​​the first pressure relief opening 1131 and / or the second pressure relief opening 1132. In some embodiments, the distance d3 between the center O1 of the first pressure relief opening 1131 and the inner surface IS of the sound-generating part 11 in the Z-direction is in the range of 4.24 mm to 6.38 mm. In some embodiments, the distance d3 between the center O1 of the first pressure relief opening 1131 and the inside IS of the sound generating part 11 in the Z direction is in the range of 4.50 mm to 5.85 mm.In some embodiments, the distance d3 between the center O1 of the first pressure relief opening 1131 and the inner surface IS of the sound-generating part 11 in the Z-direction is in the range of 4.80 mm to 5.50 mm. In some embodiments, the distance d3 between the center O1 of the first pressure relief opening 1131 and the inner surface IS of the sound-generating part 11 in the Z-direction is in the range of 5.20 mm to 5.55 mm.

[0111] In some embodiments, the sound outlet opening 112 is positioned near the free end FE to bring it closer to the ear canal and thus improve hearing performance. In this situation, the second pressure relief opening 1132 can be positioned far from the rear RS (or from the free end FE) to prevent the sound emitted from the second pressure relief opening 1132 and the sound emitted from the sound outlet opening 112 from canceling each other out at the ear canal (i.e., in the listening position), thereby reducing the perceived loudness of the sound.Furthermore, it is provided that, compared to the second pressure relief opening 1132, the sound generated by the first pressure relief opening 1131 is more difficult to transmit to the ear canal because the first pressure relief opening 1131 is located on the upper surface US, its distance to the sound outlet opening 112 is greater than the distance of the second pressure relief opening 1132 to the sound outlet opening, and the gap between the ear 100 and the inner surface IS is small. Therefore, in some embodiments, the distance between the center of the first pressure relief opening 1131 and the rear surface RS can be smaller than the distance between the center of the second pressure relief opening 1132 and the rear surface RS. In some embodiments, the distance between the center of the first pressure relief opening 1131 and the rear surface RS can also be greater than or equal to the distance between the center of the second pressure relief opening 1132 and the rear surface RS.In some embodiments, the distance a4 between the center O2 of the second pressure relief opening 1132 and the rear side RS is in the range of 13.51 mm to 20.27 mm. In some embodiments, the distance a4 between the center O2 of the second pressure relief opening 1132 and the rear side RS is in the range of 15.00 mm to 19.55 mm. In some embodiments, the distance a4 between the center O2 of the second pressure relief opening 1132 and the rear side RS is in the range of 17.15 mm to 18.25 mm.

[0112] In some embodiments, the distances from the center O1 of the first pressure relief opening 1131 and the center O2 of the second pressure relief opening 1132 to the inner surface IS of the sound-generating part 11 in the Z-direction can be equal. In some embodiments, the distance d4 between the center O2 of the second pressure relief opening 1132 and the inner surface IS of the sound-generating part 11 in the Z-direction is in the range of 4.24 mm to 6.38 mm. In some embodiments, the distance d4 between the center O2 of the second pressure relief opening 1132 and the inner surface IS of the sound-generating part 11 in the Z-direction is in the range of 4.50 mm to 5.85 mm.In some embodiments, the distance d4 between the center O2 of the second pressure relief opening 1132 and the inner surface IS of the sound-generating part 11 in the Z-direction is in the range of 4.80 mm to 5.50 mm. In some embodiments, the distance d4 between the center O2 of the second pressure relief opening 1132 and the inner surface IS of the sound-generating part 11 in the Z-direction is in the range of 5.20 mm to 5.55 mm. In some embodiments, the sound outlet opening 112 is arranged near the bottom surface LS in order to position it closer to the ear canal and thus improve hearing performance. In this situation, to minimize the cancellation between the sound emitted through the second pressure relief opening 1132 and the sound emitted through the sound outlet opening 112 at the ear canal (i.e.,To avoid excessive noise in the listening position and otherwise reduce the volume of hearing, the second pressure relief opening 1132 can be positioned further away from the inner surface IS in the Z-direction than the first pressure relief opening 1131. That is, the distance between the center O2 of the second pressure relief opening 1132 and the inner surface IS can differ from the distance between the center O1 of the first pressure relief opening 1131 and the inner surface IS. For example, the distance between the center O1 of the first pressure relief opening 1131 and the inner surface IS is 2.24 mm to 5.57 mm, and the distance between the center O2 of the second pressure relief opening 1132 and the inner surface IS is 5.57 mm to 6.36 mm.

[0113] In some embodiments, the shape of the first pressure relief opening 1131 and the second pressure relief opening 1132 influences their acoustic mass. An elongated shape of the first pressure relief opening 1131 and the second pressure relief opening 1132 results in greater sound resistance, thereby reducing the intensity of the sound from the rear chamber. Therefore, to ensure the intensity of the sound emitted through the first pressure relief opening 1131 and the second pressure relief opening 1132, the ratio of the long axis dimension to the short axis dimension of the first pressure relief opening 1131 and the second pressure relief opening 1132 (also referred to as the aspect ratio of the pressure relief opening 113) must not be too large.At the same time, the maximum dimensions of the first pressure relief opening 1131 and the second pressure relief opening 1132 in the thickness direction Z must not be too large, because the dimension of the sound-generating part 11 in the thickness direction Z is limited. Therefore, the ratio of the dimension of the long axis to the dimension of the short axis of the first pressure relief opening 1131 and the second pressure relief opening 1132, respectively, must not be too small for a given area of ​​the pressure relief opening 113. In some embodiments, it is provided that the first pressure relief opening 1131 and the second pressure relief opening 1132 can each have a circular, oval, raceway-shaped form, etc., without being limited to such a shape. For the sake of simplicity, an exemplary description is given below using the example of a first pressure relief opening 1131 and a second pressure relief opening 1132 with a raceway shape.

[0114] Fig. Figure 16 shows a schematic structural representation of a housing of the open-ear headphones according to some embodiments of the present application. As in Fig. As shown in Figure 16, the first pressure relief opening 1131 and the second pressure relief opening 1132 can have a raceway shape, wherein the two ends of the raceway shape can have a secondary arc shape or a semicircular shape. In this case, the maximum dimension of the first pressure relief opening 1131 and the second pressure relief opening 1132 in the thickness direction Z is defined as the dimension of their respective short axis, where the dimension of the short axis of the first pressure relief opening 1131 is designated as W1 and the dimension of the short axis of the second pressure relief opening 1132 as W2. The maximum dimension of the first pressure relief opening 1131 and the second pressure relief opening 1132 is defined as W2.The dimension of the second pressure relief opening 1132 in the X direction of the long axis is defined as the dimension of the respective long axis, where the dimension of the long axis of the first pressure relief opening 1131 is designated as L1 and the dimension of the long axis of the second pressure relief opening 1132 is designated as L2. Based on the principle stated above, the ratio of the dimension of the long axis to the dimension of the short axis of the first pressure relief opening 1131 or the second pressure relief opening 1132 need be neither too large nor too small. In some embodiments, the ratio of the dimension of the long axis L1 of the first pressure relief opening 1131 to the dimension of the short axis W1 of the first pressure relief opening 1131 can be in the range of 1 to 8.In some embodiments, the ratio of the dimension of the long axis L1 of the first pressure relief opening 1131 to the dimension of the short axis W1 of the first pressure relief opening 1131 can be in the range of 1.33 to 8. In some embodiments, the ratio of the dimension of the long axis L1 of the first pressure relief opening 1131 to the dimension of the short axis W1 of the first pressure relief opening 1131 can be in the range of 3 to 7. In some embodiments, the ratio of the dimension of the long axis L1 of the first pressure relief opening 1131 to the dimension of the short axis W1 of the first pressure relief opening 1131 can be in the range of 4 to 6.In some embodiments, the ratio of the dimension of the long axis L2 of the second pressure relief opening 1132 to the dimension of the short axis W2 of the second pressure relief opening 1132 can be in the range of 1 to 8. In some embodiments, the ratio of the dimension of the long axis L2 of the second pressure relief opening 1132 to the dimension of the short axis W2 of the second pressure relief opening 1132 can be in the range of 3 to 7. In some embodiments, the ratio of the dimension of the long axis L2 of the second pressure relief opening 1132 to the dimension of the short axis W2 of the second pressure relief opening 1132 can be in the range of 4 to 6.In some embodiments, it is provided that the ratio of the dimension of the long axis L2 of the second pressure relief opening 1132 to the dimension of the short axis W2 of the second pressure relief opening 1132 can also be in the range of 1 to 6.

[0115] In some embodiments, the first pressure relief opening 1131 and the second pressure relief opening 1132 each have a straight cylindrical structure, i.e., the dimensions of their respective inner and outer openings are identical. In this case, the dimension of the long axis L1 can be in the range of 1.43 mm to 16.38 mm and the dimension of the short axis W1 of the first pressure relief opening 1131 can be in the range of 1.43 mm to 5.7 mm. In some embodiments, the dimension of the long axis L1 can be in the range of 4.10 mm to 16.38 mm and the dimension of the short axis W1 of the first pressure relief opening 1131 can be in the range of 1.43 mm to 5.7 mm.In some embodiments, the dimension of the long axis L1 can be in the range of 6.14 mm to 10.92 mm, and the dimension of the short axis W1 of the first pressure relief opening 1131 can be in the range of 2.14 mm to 3.80 mm. In some embodiments, the dimension of the long axis L2 can be in the range of 1.00 mm to 10.38 mm, and the dimension of the short axis W2 of the second pressure relief opening 1132 can be in the range of 1.00 mm to 4.05 mm. In some embodiments, the dimension of the long axis L2 can be in the range of 2.59 mm to 10.38 mm, and the dimension of the short axis W2 of the second pressure relief opening 1132 can be in the range of 1.52 mm to 4.05 mm.In some embodiments, it is provided that the dimension of the long axis L2 can be in the range of 3.89 mm to 6.92 mm and the dimension of the short axis W2 of the second pressure relief opening 1132 can be in the range of 2.28 mm to 4.05 mm.

[0116] To facilitate machining and manufacturing and reduce the complexity of the process, in some embodiments the first pressure relief opening 1131 and the second pressure relief opening 1132 can be designed as horn-shaped structures. For example, the area of ​​an inner opening is smaller than the area of ​​a corresponding outer opening, or the area of ​​the outer opening is smaller than the area of ​​the corresponding inner opening.

[0117] In some embodiments, both the first pressure relief opening 1131 and the second pressure relief opening 1132 have a horn-shaped structure. The dimension of the long axis of the outer opening of the first pressure relief opening 1131 in the X-direction can range from 4.10 mm to 16.38 mm, the dimension of the short axis of the outer opening of the first pressure relief opening 1131 in the Z-direction can range from 1.43 mm to 5.7 mm, and the area of ​​the outer opening of the first pressure relief opening 1131 is in the range of 5.39 mm². 2 up to 86.21 mm 2The dimension of the long axis of the inner opening of the first pressure relief opening 1131 in the X-direction can be in the range of 3.92 mm to 15.68 mm, the dimension of the short axis of the inner opening of the first pressure relief opening 1131 in the Z-direction can be in the range of 1.29 mm to 5.14 mm, and the area of ​​the inner opening of the first pressure relief opening 1131 is in the range of 4.58 mm². 2 up to 73.32 mm 2 The dimension of the long axis of the outer opening of the second pressure relief opening 1132 in the X-direction can be in the range of 2.59 mm to 10.38 mm, the dimension of the short axis of the outer opening of the second pressure relief opening 1132 in the Z-direction can be in the range of 1.52 mm to 4.05 mm, and the area of ​​the outer opening of the second pressure relief opening 1132 is in the range of 3.42 mm². 2 up to 54.68 mm 2The dimension of the long axis of the inner opening of the second pressure relief opening 1132 in the X-direction can be in the range of 2.28 mm to 9.1 mm, the dimension of the short axis of the inner opening of the second pressure relief opening 1132 in the Z-direction can be in the range of 1.26 mm to 5.04 mm, and the area of ​​the inner opening of the second pressure relief opening 1132 is in the range of 2.56 mm². 2 up to 40.90 mm 2In some embodiments, both the first pressure relief opening 1131 and the second pressure relief opening 1132 have a horn-shaped structure. The dimension of the long axis of the outer opening of the first pressure relief opening 1131 in the X-direction can range from 6.14 mm to 10.92 mm, the dimension of the short axis of the outer opening of the first pressure relief opening 1131 in the Z-direction can range from 2.14 mm to 3.80 mm, and the area of ​​the outer opening of the first pressure relief opening 1131 is in the range of 12.12 mm². 2 up to 38.32 mm 2The dimension of the long axis of the inner opening of the first pressure relief opening 1131 in the X-direction can be in the range of 5.88 mm to 10.45 mm, the dimension of the short axis of the inner opening of the first pressure relief opening 1131 in the Z-direction can be in the range of 1.93 mm to 3.43 mm, and the area of ​​the inner opening of the first pressure relief opening 1131 is in the range of 10.31 mm². 2 up to 32.59 mm 2 The dimension of the long axis of the outer opening of the second pressure relief opening 1132 in the X-direction can be in the range of 3.89 mm to 6.92 mm, the dimension of the short axis of the outer opening of the second pressure relief opening 1132 in the Z-direction can be in the range of 2.28 mm to 4.05 mm, and the area of ​​the outer opening of the second pressure relief opening 1132 is in the range of 7.69 mm². 2 up to 24.30 mm 2The dimension of the long axis of the inner opening of the second pressure relief opening 1132 in the X-direction can be in the range of 3.41 mm to 6.61 mm, the dimension of the short axis of the inner opening of the second pressure relief opening 1132 in the Z-direction can be in the range of 1.89 mm to 3.36 mm, and the area of ​​the inner opening of the second pressure relief opening 1132 is in the range of 5.75 mm². 2 up to 18.18 mm 2In some embodiments, both the first pressure relief opening 1131 and the second pressure relief opening 1132 have a horn-shaped structure. The dimension of the long axis of the outer opening of the first pressure relief opening 1131 in the X-direction can be 8.19 mm, the dimension of the short axis of the outer opening of the first pressure relief opening 1131 in the Z-direction can be 2.85 mm, and the area of ​​the outer opening of the first pressure relief opening 1131 is 21.55 mm². 2 The dimension of the long axis of the inner opening of the first pressure relief opening 1131 in the X-direction can be 7.84 mm, the dimension of the short axis of the inner opening of the first pressure relief opening 1131 in the Z-direction can be 2.57 mm, and the area of ​​the inner opening of the first pressure relief opening 1131 is 18.33 mm². 2The dimension of the long axis of the outer opening of the second pressure relief opening 1132 in the X-direction can be 5.19 mm, the dimension of the short axis of the outer opening of the second pressure relief opening 1132 in the Z-direction can be 3.04 mm, and the area of ​​the outer opening of the second pressure relief opening 1132 is 13.67 mm². 2 The dimension of the long axis of the inner opening of the second pressure relief opening 1132 in the X-direction can be 4.55 mm, the dimension of the short axis of the inner opening of the second pressure relief opening 1132 in the Z-direction can be 2.52 mm, and the area of ​​the inner opening of the second pressure relief opening 1132 is 10.23 mm². 2 .

[0118] In some embodiments, the ratio of the area of ​​the inner opening of the first pressure relief opening 1131 to the area of ​​the sound outlet opening 112 can be from 0.1 to 15. In some embodiments, the ratio of the area of ​​the inner opening of the second pressure relief opening 1132 to the area of ​​the sound outlet opening 112 can be from 0.1 to 3. In some embodiments, the ratio of the area of ​​the inner opening of the first pressure relief opening 1131 to the area of ​​the sound outlet opening 112 can be from 0.2 to 10. In some embodiments, the ratio of the area of ​​the inner opening of the second pressure relief opening 1132 to the area of ​​the sound outlet opening 112 can be from 0.1 to 2.In some embodiments, the ratio of the area of ​​the inner opening of the first pressure relief opening 1131 to the area of ​​the sound outlet opening 112 can be from 0.3 to 5. In some embodiments, the ratio of the area of ​​the inner opening of the second pressure relief opening 1132 to the area of ​​the sound outlet opening 112 can be from 0.2 to 1.

[0119] In some embodiments, the first pressure relief opening 1131 and the second pressure relief opening 1132, together with the rear chamber 116, form a model of the Helmholtz resonator as acoustic openings. As can be seen from formula (2) described below, the resonance frequency of the rear chamber 116 is higher the larger the area of ​​the first pressure relief opening 1131 and the second pressure relief opening 1132. This shifts the resonance frequency of the corresponding sound loss as far as possible towards the higher frequency band (e.g., into the frequency range above 4 kHz), which contributes to improving the flatness of the frequency response curve and further reducing the audibility of the sound loss.

[0120] Fig. Figure 17 shows a diagram of frequency response curves of an open-ear headphone corresponding to the first pressure relief openings with different areas according to some embodiments of the present application. Fig. Figure 18 shows a diagram of frequency response curves of an open-ear headphone corresponding to the second pressure relief openings with different areas according to some embodiments of the present application.

[0121] As in Fig. Figure 17 shows curves 171, 172, 173, 174, and 175, respectively, representing the frequency response curves for the first pressure relief opening 1131 with an area of ​​0.252 mm². 2 , 5.52 mm 2 , 8.52 mm 2 , 11.52 mm 2 As in Fig. Figure 18 shows curves 181, 182, 183, 184, and 185, respectively, representing the frequency response curves for the second pressure relief opening 1132 with an area of ​​0.402 mm². 2 , 5.52 mm 2 , 7.02 mm 2 , 8.52 mm 2 .

[0122] As from Fig. As can be seen in Figure 17, the resonance frequency corresponding to the rear chamber in the frequency response curve of the open-ear headphone 10 (i.e., the frequency corresponding to the resonance peak in the dashed circle Gl) is gradually shifted towards the high frequency with a gradually increasing area of ​​the first pressure relief opening 1131 when other structures (such as the sound outlet opening 112, the second pressure relief opening 1132, etc.) are fixed, so that the flat region of the frequency response curve is broadened. Once the area of ​​the first pressure relief opening reaches 11.52 mm² 2As the volume increases, the shift of the resonant frequency corresponding to the rear chamber towards the high frequency slows down. It should be noted that this is the case in Fig. The frequency response curve shown in Figure 17 is a frequency response curve obtained by simulation with the second pressure relief opening 1132 in the same position and dimensions, located 15 mm in front of the center O of the sound outlet opening. As shown in Figure 17, the second pressure relief opening 1132 was positioned 15 mm from the center O of the sound outlet opening. Fig. As can be seen similarly in Figure 18, the resonance frequency corresponding to the rear chamber in the frequency response curve of the open-ear headphone 10 (i.e., the frequency corresponding to the resonance peak in the dashed circle G2) is gradually shifted towards the high frequency with a gradually increasing area of ​​the second pressure relief opening 1132 when other structures (such as the sound outlet opening 112, the first pressure relief opening 1131, etc.) are fixed, so that the flat region of the frequency response curve is broadened. It should be noted that the in Fig. The frequency response curve shown in Figure 18 is a frequency response curve obtained by simulation with unchanged position and dimensions of the first pressure relief opening 1131 at a distance of 15 mm directly in front of the center O of the sound outlet opening.

[0123] In some embodiments, the area of ​​the first pressure relief opening 1131 and / or the area of ​​the second pressure relief opening 1132 need not be too small, so that the frequency response curve of the open-ear headphones achieves a broad, flat region (e.g., the region before the resonance peak) and improved effectiveness in reducing sound loss in the mid to high frequency range (e.g., 2 kHz to 6 kHz). This also ensures sufficient far-field sound intensity generated in the rear chamber when the high-pressure zone of the sound field in the rear chamber is disrupted.Furthermore, in practical applications, excessively large areas of the first pressure relief opening 1131 and / or the second pressure relief opening 1132 can negatively impact the appearance, structural strength, water and dust resistance, and other aspects of the open-ear headphones 10. Therefore, the area of ​​the first pressure relief opening 1131 and / or the area of ​​the second pressure relief opening 1132 should not be too large. In some embodiments, the area of ​​the first pressure relief opening 1131 is specified as being in the range of 3.78 mm. 2 up to 86.21 mm 2 lies, and that the area of ​​the second pressure relief opening 1132 is in the range of 2.78 mm 2 up to 54.68 mm 2 In some embodiments, the area of ​​the first pressure relief opening 1131 is in the range of 3.78 mm. 2 up to 22.07 mm 2lies, and that the area of ​​the second pressure relief opening 1132 is in the range of 2.78 mm 2 up to 16.07 mm 2 In some embodiments, the area of ​​the first pressure relief opening 1131 is in the range of 6.78 mm. 2 up to 20.07 mm 2 lies, and that the area of ​​the second pressure relief opening 1132 is in the range of 4.78 mm 2 up to 13.07 mm 2 lies.

[0124] In some embodiments, the pressure relief openings 113 (comprising the first pressure relief opening 1131 and the second pressure relief opening 1132) arranged in the housing 111 and the rear chamber can be considered a model of the Helmholtz resonator. Therefore, the opening size of the first pressure relief opening 1131 and the second pressure relief opening 1132 influences the resonance frequency of the rear chamber. To ensure that the resonance frequency of the rear chamber remains at a relatively high frequency, for example, within the frequency range of 2000 Hz to 6000 Hz, this can be achieved by designing the ratio of the opening size of the first pressure relief opening 1131 or the second pressure relief opening 1132 to the volume of the rear chamber.To enable the sound-generating part 11 to form a first leakage structure and / or a second leakage structure, as described, for example, in other sections of the present application, when the sound-generating part is at least partially inserted into the caveum conchae, some embodiments provide that the dimension of the sound-generating part 11 in the Y-direction can be determined according to the dimension of the caveum conchae. In this case, at a fixed distance between the sound outlet opening 112 and the base of the transducer (e.g., the base of the magnetic circuit arrangement 1164 in the transducer 116 in ), Fig. 20A) The volume of the rear chamber depends on the area of ​​the top surface (US) and / or the bottom surface (LS) of the sound-generating part 11. To achieve a sufficiently high resonance frequency of the rear chamber, the ratio of the area of ​​the pressure relief openings 113 to the volume of the rear chamber must not be too small. In other words, the ratio of the area of ​​the pressure relief openings 113 to the area of ​​the top surface (US) and / or the bottom surface (LS) must not be too small. To ensure the stability of the physical structure of the housing 111 and thus the service life of the open-ear headphones 10, the ratio of the area of ​​the pressure relief openings 113 to the area of ​​the top surface (US) and / or the bottom surface (LS) must also not be too large.In some embodiments, the ratio of the area of ​​the first pressure relief opening 1131 to the area of ​​the top surface US is between 0.036 and 0.093, and the ratio of the area of ​​the second pressure relief opening 1132 to the area of ​​the bottom surface LS is between 0.018 and 0.051. In some embodiments, the ratio of the area of ​​the first pressure relief opening 1131 to the area of ​​the top surface US is between 0.046 and 0.083, and the ratio of the area of ​​the second pressure relief opening 1132 to the area of ​​the bottom surface LS is between 0.028 and 0.041. In some embodiments, the ratio of the area of ​​the first pressure relief opening 1131 to the area of ​​the top surface US is between 0.056 and 0.073, and the ratio of the area of ​​the second pressure relief opening 1132 to the area of ​​the bottom surface LS is between 0.031 and 0.038.In some embodiments, the ratio of the area of ​​the first pressure relief opening 1131 to the area of ​​the top surface US is between 0.061 and 0.068, and the ratio of the area of ​​the second pressure relief opening 1132 to the area of ​​the bottom surface LS is between 0.033 and 0.036.

[0125] Fig. Figure 19 shows a schematic representation of a projection of the open-ear headphones in the worn state onto the sagittal plane according to some embodiments of the present application.

[0126] Combined with Fig. 14 and Fig. In some embodiments, 19 provides that the free end FE can lie inside the cavum conchae in the X direction of the long axis and the Y direction of the short axis in order to stably support the sound-generating part 11 against the user's ear, the design of which in Fig. The chamber structure shown in Figure 10 is simplified and at least two leakage structures are provided to the chamber structure. The inner surface IS of the sound-generating element 11 is inclined relative to the sagittal plane, and there is at least one first leakage structure UC (i.e., a gap formed between the concha and the upper boundary of the inner surface IS) located near the top of the head and a second leakage structure LC (i.e., a gap formed between the concha and the lower boundary of the inner surface IS) located near the ear canal. This allows the volume of hearing, especially at mid or low frequencies, to be increased. At the same time, the effect of cancellation for sound loss in the far field is retained. This improves the acoustic output performance of the open-ear headphone 10.

[0127] If the open-ear headphones are 10, as in Fig. In some embodiments, the first leakage structure UC and the second leakage structure LC, each formed between the inner surface IS of the sound-generating part and the concha, as shown in Figure 14, have specific dimensions in the X direction of the long axis and in the Z direction of the thickness. To better understand the positions of the first leakage structure UC and the second leakage structure LC, the midpoint between the two points formed by the intersection of the upper / lower boundary of the inner surface IS of the open-ear headphone 10 with the ear (for example, the flank of the concha, the crus helicis) in the worn state can serve as a reference point for the positions of the first leakage structure UC and the second leakage structure LC, with the center of the ear canal opening serving as a reference point for the position of the ear canal.In some embodiments, to better understand the positions of the first leakage structure UC and the second leakage structure LC, the midpoint of the upper boundary of the inner surface IS of the open-ear headphones 10, when worn, can serve as a reference point for the position of the first leakage structure UC, and the third-division point of the lower boundary of the inner surface IS, located near the free end FE (hereinafter referred to as the point at the third of the lower boundary of the inner surface IS), can serve as a reference point for the position of the second leakage structure LC. In the case of an arc-shaped connection area between the inner surface IS and the upper surface US and / or the lower surface LS, the upper boundary of the inner surface IS can, in this description, refer to an intersection line between the inner surface IS and the upper surface US, and the lower boundary of the inner surface IS can refer to an intersection line between the inner surface IS and the lower surface LS.In some embodiments, the line of intersection between the two sides may refer to a line of intersection between the tangential surfaces that are furthest from the center of the sound-generating part and run parallel to its long or short axis, of the two sides, provided that one or more sides of the sound-generating part 11 (for example, the inside IS, the top US and / or the bottom LS) each represent an arc surface.

[0128] In this description, the midpoint of the upper boundary and the point at the third of the lower boundary of the inner surface IS are used as examples only, each serving as a reference point for the positions of the first leakage structure UC and the second leakage structure LC. It should be noted that the midpoint of the upper boundary and the point at the third of the lower boundary of the inner surface IS are selected only as examples of reference points for describing the positions of the first leakage structure UC and the second leakage structure LC. In some embodiments, other reference points may also be selected for describing the positions of the first leakage structure UC and the second leakage structure LC.For example, differences between the ears of different users mean that the first leakage structure UC / the second leakage structure LC formed in the open-ear headphones 10 when worn each represent a gap with a gradually changing width. In this case, the reference position of the first leakage structure UC / the second leakage structure LC can be the position of an area of ​​greatest width located near the gap at the upper / lower boundary of the inner surface IS. For example, the point near the free end FE at one-third of the upper boundary of the inner surface IS can serve as the position of the first leakage structure UC, and the midpoint of the lower boundary of the inner surface IS can serve as the position of the second leakage structure LC.

[0129] As in Fig. As shown in Figure 19, in some embodiments, the projection of the upper boundary of the inner surface IS onto the sagittal plane can coincide with the projection of the upper surface US onto the sagittal plane, and the projection of the lower boundary of the inner surface IS onto the sagittal plane can coincide with the projection of the lower surface LS onto the sagittal plane. The projection of the reference point for the position of the first leakage structure UC (i.e., the midpoint of the upper boundary of the inner surface IS) onto the sagittal plane is designated as point A, and the projection of the reference point for the position of the second leakage structure LC (i.e., the point at the third of the lower boundary of the inner surface IS) onto the sagittal plane is designated as point C.The “projection point A of the center point of the upper boundary of the inner surface IS onto the sagittal plane” can refer to a projection point of an intersection between the upper boundary of the inner surface IS and the median plane of the short axis of the magnetic circuit arrangement (for example, the magnetic circuit arrangement 1144 described below) of the transducer onto the sagittal plane. The median plane of the short axis of the magnetic circuit arrangement refers to a plane that runs parallel to the direction of the short axis of the sound-generating part 11 and passes through the geometric center of the magnetic circuit arrangement. The “projection point C of the point at the third of the lower boundary of the inner surface IS onto the sagittal plane” can be a projection point of the third-division point of the lower boundary of the inner surface IS onto the sagittal plane, located near the free end FE.

[0130] As in Fig. As shown in Figure 19, in some embodiments, the projection of the sound-generating part 11 of the open-ear headphones 10 onto the sagittal plane at least partially covers the user's ear canal when worn, while the ear canal remains open to the outside environment through the cavum conchae, thus exposing both of the user's ears. In some embodiments, the sound from the pressure relief openings 113 can be transmitted via the leakage structures (e.g., the first leakage structure UC or the second leakage structure LC) to the chamber structure and then canceled out against the sound from the sound outlet opening 112. Therefore, the first pressure relief opening 1131 and the second pressure relief opening 1132 should not be located too close to the leakage structures on the top and bottom surfaces.

[0131] In some embodiments, the projection point O1' of the center O1 of the first pressure relief opening 1131 onto the sagittal plane and the projection point A of the center point of the upper boundary of the inner surface IS onto the sagittal plane can essentially coincide. In some embodiments, the distance between a projection point O1' of the center O1 of the first pressure relief opening 1131 onto the sagittal plane and the projection point A of the center point of the upper boundary of the inner surface IS onto the sagittal plane is not greater than 2 mm. In some embodiments, the distance between the projection point O1' of the center O1 of the first pressure relief opening 1131 onto the sagittal plane and the projection point A of the center point of the upper boundary of the inner surface IS onto the sagittal plane is not greater than 1 mm.In some embodiments, the distance between the projection point O1' of the center O1 of the first pressure relief opening 1131 onto the sagittal plane and the projection point A of the center point of the upper boundary of the inner side IS onto the sagittal plane is in the range of not greater than 0.5 mm.

[0132] If the relative position between the sound outlet 112 and the first pressure relief vent 1131 remains unchanged, i.e., if the distance between the center O of the sound outlet 112 and the center O1 of the first pressure relief vent 1131 remains constant, the audibility index of the entire open-ear headphone 10 (across the full frequency band) decreases as the volume V of the chamber structure increases. This is because, due to air acoustic resonance within the chamber structure, an air acoustic resonance occurs at the chamber structure's resonant frequency, causing a sound that is significantly louder than that emitted through the pressure relief vent 113 to be radiated outwards. This leads to a substantial increase in sound loss, which significantly reduces the audibility index near this resonant frequency.

[0133] In some embodiments, the volume V of the chamber structure is larger the greater the distance between the projection point O2' of the center O2 of the second pressure relief opening 1132 onto the sagittal plane and the projection point A of the center point of the upper boundary of the inner surface IS onto the sagittal plane. Provided that the sound-generating element 11 is at least partially inserted into the cavum conchae, some embodiments provide for the distance from point O2' to point A to be in the range of 14.4 mm to 21.6 mm, so that the chamber structure has a suitable volume V, thus enabling better sound reception quality in the ear canal. In other embodiments, the distance between point O2' and point A is in the range of 16.4 mm to 19.6 mm.In some embodiments, the distance between point O2' and point A is in the range of 17.4 mm to 18.6 mm. In some embodiments, the distance between point O2' and point A is in the range of 17.8 mm to 18.2 mm.

[0134] In some embodiments, the distance between the projection point A of the center of the upper boundary of the inner surface IS onto the sagittal plane and a projection point O3' of the center O3 of the ear canal opening onto the sagittal plane is in the range of 12 mm to 18 mm, and the distance between the projection point O2' of the center O2 of the second pressure relief opening onto the sagittal plane and the projection point O3' of the center O3 of the ear canal opening onto the sagittal plane is in the range of 6.88 mm to 10.32 mm to ensure that the sound-generating part 11 projects into the cavum conchae and that there is an inclined gap between the upper boundary of the inner surface IS and the cavum conchae (to form an opening of the chamber structure).In some embodiments, the distance between the projection point A of the center of the upper boundary of the inner surface IS onto the sagittal plane and the projection point O3' of the center O3 of the ear canal opening onto the sagittal plane is in the range of 14 mm to 16 mm, and the distance between the projection point O2' of the center O2 of the second pressure relief opening onto the sagittal plane and the projection point O3' of the center O3 of the ear canal opening onto the sagittal plane is in the range of 7.88 mm to 9.32 mm.In some embodiments, the distance between the projection point A of the center of the upper boundary of the inner surface IS onto the sagittal plane and the projection point O3' of the center O3 of the ear canal opening onto the sagittal plane is in the range of 14.5 mm to 15.5 mm, and the distance between the projection point O2' of the center O2 of the second pressure relief opening onto the sagittal plane and the projection point O3' of the center O3 of the ear canal opening onto the sagittal plane is in the range of 7.88 mm to 8.32 mm.

[0135] In some embodiments, the distance between the projection point O1' of the center O1 of the first pressure relief opening 1131 onto the sagittal plane and the projection point O3' of the center O3 of the ear canal opening onto the sagittal plane is in the range of 12 mm to 18 mm to ensure that the sound-generating part 11 projects into the cavum conchae and that an inclined gap exists between the upper boundary of the inner surface IS and the cavum conchae (to form an opening of the chamber structure). In some embodiments, the distance between the projection point O1' of the center O1 of the first pressure relief opening 1131 onto the sagittal plane and the projection point O3' of the center O3 of the ear canal opening onto the sagittal plane is in the range of 14 mm to 16 mm.In some embodiments, the distance between the projection point O1' of the center O1 of the first pressure relief opening 1131 onto the sagittal plane and the projection point O3' of the center O3 of the ear canal opening onto the sagittal plane is in the range of 14.5 mm to 15.5 mm.

[0136] In some embodiments, the volume V of the chamber structure is larger the greater the distance between the projection point O1' of the center O1 of the first pressure relief opening 1131 onto the sagittal plane and the projection point B of the point at the third of the lower boundary of the inner surface IS onto the sagittal plane. Provided that the sound-generating element 11 is at least partially inserted into the cavum conchae, some embodiments therefore provide that the distance between the projection point O1' of the center O1 of the first pressure relief opening 1131 onto the sagittal plane and the projection point B of the point at the third of the lower boundary of the inner surface IS onto the sagittal plane is in the range of 13.76 mm to 20.64 mm, so that the chamber structure has a suitable volume V, thus enabling better sound reception quality in the ear canal.In some embodiments, the distance between the projection point O1' of the center O1 of the first pressure relief opening 1131 onto the sagittal plane and the projection point B of the point at the third of the lower boundary of the inner surface IS onto the sagittal plane is in the range of 15.76 mm to 18.64 mm. In some embodiments, the distance between the projection point O1' of the center O1 of the first pressure relief opening 1131 onto the sagittal plane and the projection point B of the point at the third of the lower boundary of the inner surface IS onto the sagittal plane is in the range of 16.16 mm to 18.24 mm.

[0137] In some embodiments, the distance between the projection point O2' of the center O2 of the second pressure relief opening 1132 onto the sagittal plane and the projection point B of the point at the third of the lower boundary of the inner surface IS onto the sagittal plane is in the range of 8.16 mm to 12.24 mm in order to reduce the mutual cancellation of the sound from the second pressure relief opening 1132 and the sound from the sound outlet opening 112 by transmission via the second leakage structure LC to the chamber structure. In some embodiments, the distance between the projection point O2' of the center O2 of the second pressure relief opening 1132 onto the sagittal plane and the projection point B of the point at the third of the lower boundary of the inner surface IS onto the sagittal plane is in the range of 9.16 mm to 11.24 mm.In some embodiments, the distance between the projection point O2' of the center O2 of the second pressure relief opening 1132 onto the sagittal plane and the projection point B of the point at the third of the lower boundary of the inner surface IS onto the sagittal plane is in the range of 9.66 mm to 10.74 mm.

[0138] In some embodiments, the distance between projection point B of the point at the third of the lower boundary of the inner surface onto the sagittal plane and projection point O3' of the center O3 of the ear canal opening onto the sagittal plane is in the range of 1.76 mm to 2.64 mm to ensure that the sound-generating part 11 projects into the cavum conchae and that an inclined gap exists between the upper boundary of the inner surface IS and the cavum conchae (to form an opening of the chamber structure). In some embodiments, the distance between projection point B of the point at the third of the lower boundary of the inner surface onto the sagittal plane and projection point O3' of the center O3 of the ear canal opening onto the sagittal plane is in the range of 1.96 mm to 2.44 mm.In some embodiments, the distance between the projection point B of the point at the third of the lower boundary of the inner side onto the sagittal plane and the projection point O3' of the center O3 of the ear canal opening onto the sagittal plane is in the range of 2.16 mm to 2.24 mm.

[0139] Fig. Figure 20A shows an exemplary representation of an internal structure of a sound-generating part according to some embodiments of the present application.

[0140] As in Fig. As shown in Figure 20A, the sound-generating part 11 can comprise the housing 111 in conjunction with the ear hook 12 and the transducer 116 arranged in the housing 111. In some embodiments, the sound-generating part 11 can further comprise a main control circuit board 13 arranged in the housing 111 and a battery (not shown) located at an end of the ear hook 12 remote from the sound-generating part 11. The battery and the transducer 116 are each electrically connected to the main control circuit board 13 to enable the transducer 116 to be powered by the battery under the control of the main control circuit board 13. Naturally, the battery and the transducer 116 can be arranged within the sound-generating part 11, with the battery being located closer to the connection end CE and the transducer 116 closer to the free end FE.

[0141] In some embodiments, the open-ear headphones 10 include an adjustment mechanism for connecting the sound-generating element 11 to the ear hook 12. This adjustment mechanism allows different users to adjust the relative position of the sound-generating element 11 on the ear while wearing the headphones, ensuring that the sound-generating element 11 is positioned appropriately so that it forms the chamber structure together with the cavum conchae. The adjustment mechanism also allows the user to adjust the headphones 10 for a more stable and comfortable fit.

[0142] Due to the volume and depth of the concha, a certain distance can arise between the inner surface IS of the sound-generating part 11 and the concha after the free end FE projects into the concha. In other words, when worn, the sound-generating part 11, together with the concha, can form the chamber structure communicating with the external auditory canal, with the sound-generating part 11 (for example, the inner surface IS) being provided with the sound outlet 112, and the sound outlet 112 being at least partially located within the chamber structure. In this way, when worn, the sound wave propagating through the sound outlet 112 is limited by the chamber structure; that is, the chamber structure can focus the sound wave.This allows the sound wave to be transmitted more effectively into the outer ear canal, thus improving the volume and sound quality of the sound heard by the user in the near field, which contributes to an improvement in the acoustic performance of the headphones 10. Furthermore, the chamber structure above is designed to be partially open, as the sound-generating element 11 can be adjusted so that it does not block the outer ear canal when worn.In this way, part of the sound wave propagated via the sound outlet opening 112 can spread to the ear canal so that the user can hear the sound, and another part of it can, together with the sound reflected at the ear canal, spread out of the headphone 10 and the ear via a gap between the sound-generating part 11 and the ear (for example, a part of the cavum conchae that is not covered by the sound-generating part 11), resulting in an initial loss of sound in the far field.The sound wave propagated from the pressure relief openings 113 provided in the sound generation part 11 (for example, the first pressure relief opening 1131 and the second pressure relief opening 1132) generally simultaneously creates a second sound loss in the far field, wherein the magnitude of the first sound loss above is comparable to the magnitude of the second sound loss above, and wherein the phase of the first sound loss above and the phase of the second sound loss above are (almost) out of phase, so that the two can cancel each other out in the far field, which contributes to reducing the sound loss of the open-ear headphones 10 in the far field.

[0143] In some embodiments, the front chamber 114 can be formed between the transducer 116 and the housing 111, and the sound outlet opening 112 is provided in an area of ​​the housing 111 that surrounds the front chamber 114, with the front chamber 114 communicating with the outside environment via the sound outlet opening 112.

[0144] In some embodiments, the front chamber 114 is located between the diaphragm of the transducer 116 and the housing 111. To ensure sufficient vibration space for the diaphragm, the front chamber 114 can have a greater depth (i.e., a greater distance between the diaphragm of the transducer 116 and the housing 111 directly opposite it). As shown in Fig. As shown in Figure 20A, in some embodiments the sound outlet opening 112 is provided in the inner surface IS in the thickness direction Z, where the depth of the front chamber 114 can refer to a dimension of the front chamber 114 in the Z direction. However, if the front chamber 114 has too great a depth, the dimension of the sound-generating part 11 is increased, which impairs the wearing comfort of the open-ear headphones 10. In some embodiments, the depth of the front chamber 114 can be between 0.55 mm and 1.00 mm. In some embodiments, the depth of the front chamber 114 can be between 0.66 mm and 0.99 mm. In some embodiments, the depth of the front chamber 114 can be between 0.76 mm and 0.99 mm. In some embodiments, the depth of the front chamber 114 can be between 0.96 mm and 0.99 mm. In some embodiments, the depth of the front chamber 114 can be 0.97 mm.

[0145] To improve the sound emission quality of the open-ear headphones 10, the resonant frequency of the structure formed by the front chamber 114 and the sound outlet 112, which functions like a Helmholtz resonator, should be as high as possible so that the overall frequency response curve of the sound-generating part exhibits a broad, flat range. In some embodiments, the resonant frequency f1 of the front chamber 114 cannot be lower than 3 kHz. In some embodiments, the resonant frequency f1 of the front chamber 114 cannot be lower than 4 kHz. In some embodiments, the resonant frequency of the front chamber 114 cannot be lower than 6 kHz. In some embodiments, the resonant frequency of the front chamber 114 cannot be lower than 7 kHz. In some embodiments, the resonant frequency of the front chamber 114 cannot be lower than 8 kHz.

[0146] See Fig. 20A. In some embodiments, a sound-absorbing mesh 118 can be arranged in a position corresponding to one of the first pressure relief openings 1131 and / or the second pressure relief opening 1132. The sound-absorbing mesh 118 can regulate the amplitude of the resonance frequency of the rear chamber and simultaneously serves as a dust and water seal. When the other parameters of the sound-absorbing mesh 118 are determined, the magnitude of the sound resistance of the sound-absorbing mesh depends on its thickness. Sound-absorbing meshes of different thicknesses have a certain influence on the acoustic emission performance of the respective acoustic openings. Thus, the sound-absorbing mesh 118 has a thickness within a limited range.In some embodiments, the thickness of the sound-absorbing meshes 118 arranged at the first pressure relief opening 1131 and the second pressure relief opening 1132 can range from 35 µm to 300 µm. In some embodiments, the thickness of the sound-absorbing meshes 118 arranged at the first pressure relief opening 1131 and the second pressure relief opening 1132 can range from 40 µm to 150 µm. In some embodiments, the thickness of the sound-absorbing meshes 118 arranged at the first pressure relief opening 1131 and the second pressure relief opening 1132 can range from 50 µm to 65 µm. In some embodiments, it is provided that the thickness of the sound-absorbing meshes 118 arranged at the first pressure relief opening 1131 and the second pressure relief opening 1132 can be in the range of 55 µm to 62 µm.On the other hand, the position for the arrangement of the sound-absorbing mesh 118 is closer to the rear chamber, and the volume of the rear chamber is smaller, the greater the distance between an end of the sound-absorbing mesh 118 facing the outside of the housing 111 (i.e., the upper surface of the sound-absorbing mesh 118) and the outer surface of the housing 111. In some embodiments, the distance between the upper surface of the sound-absorbing mesh 118 at the first pressure relief opening 1131 and the outer surface of the housing 1111 can be 0.8 mm to 0.9 mm, and the distance between the upper surface of the sound-absorbing mesh 118 at the second pressure relief opening 1132 and the outer surface of the housing 1111 can be 0.7 mm to 0.8 mm.In some embodiments, the distance between the upper surface of the sound-absorbing mesh 118 at the first pressure relief opening 1131 and the outer surface of the housing 1111 can be 0.82 mm to 0.88 mm, and the distance between the upper surface of the sound-absorbing mesh 118 at the second pressure relief opening 1132 and the outer surface of the housing 1111 can be 0.72 mm to 0.76 mm. In some embodiments, the distance between the upper surface of the sound-absorbing mesh 118 at the first pressure relief opening 1131 and the outer surface of the housing 1111 can be 0.86 mm, and the distance between the upper surface of the sound-absorbing mesh 118 at the second pressure relief opening 1132 and the outer surface of the housing 1111 can be 0.73 mm.

[0147] Fig. Figure 20B shows an exemplary structural representation of a second acoustic chamber according to some embodiments of the present description.

[0148] See Fig. 20A and Fig. 20B. In some embodiments, a support 117 may be arranged within the housing 111. The support 117, together with the transducer 116, may enclose a chamber 115, thereby separating the chamber 115 from other structures within the housing 111 (such as the main control circuit board 13, etc.), which contributes to improving the acoustic performance of the sound-generating part 11. It can be seen that the rear chamber described in other sections of this description may include not only the chamber 115 but also other areas behind the diaphragm that communicate with the chamber 115, for example, the space between the diaphragm and the magnetic circuit arrangement. The housing 111 is provided with a pressure relief opening 113 (e.g., a first pressure relief opening 1131 and / or a second pressure relief opening 1132).An acoustic channel is provided on the carrier 117, which communicates with the pressure relief opening 113 and the chamber 115, thus facilitating communication between the chamber 115 and the external environment. This means that air can flow freely into and out of the rear chamber, which helps to reduce the resistance to which the diaphragm of the transducer 116 is subjected during vibration.

[0149] In some embodiments, the frequency response curve of the rear chamber is designed to have a broad and flat range to improve the acoustic output performance of the open-ear headphones 10. Therefore, the resonant frequency of the rear chamber can be set to a high value. Furthermore, in some embodiments, the resonant frequency of the rear chamber can be equal to the resonant frequency of the front chamber 114, so that the second sound loss formed by the aforementioned pressure relief opening 113 and the first sound loss can be better canceled out. In some embodiments, the deviation of the resonant frequency of the rear chamber from the resonant frequency of the front chamber 114 is limited to a maximum of 1 kHz.In some embodiments, the deviation of the resonant frequency of the rear chamber from the resonant frequency of the front chamber 114 is specified as not exceeding 500 Hz. In some embodiments, the deviation of the resonant frequency of the rear chamber from the resonant frequency of the front chamber 114 is specified as not exceeding 200 Hz. In some embodiments, the resonant frequency of the rear chamber is specified as not less than 4.5 kHz. In some embodiments, the resonant frequency of the rear chamber is specified as not less than 6 kHz. In some embodiments, the resonant frequency of the rear chamber is specified as being 8 kHz.

[0150] In some embodiments, the combination of the rear chamber and the pressure relief port 113 arranged in the housing 111 can be considered a model of the Helmholtz resonator. The rear chamber can serve as a chamber of the model Helmholtz resonator, and the pressure relief port can serve as a neck of the model Helmholtz resonator. In this case, the resonance of the model Helmholtz resonator corresponds to the resonance frequency of the rear chamber. In the model Helmholtz resonator, the dimension of the neck (such as the first pressure relief port 1131 or the second pressure relief port 1132) can influence the resonance frequency f of the chamber (such as the rear chamber), the specific relationship being described by formula (2): f=c2πSVL.

[0151] Here, c represents the speed of sound, S the area of ​​the neck (e.g., of the first pressure relief opening 1131 or the second pressure relief opening 1132), V the volume of the chamber (e.g., of the rear chamber), and L the depth of the neck (e.g., of the first pressure relief opening 1131 or the second pressure relief opening 1132).

[0152] Formula (2) shows that the resonance frequency f2 of the rear chamber increases with decreasing volume V of the rear chamber. Therefore, to achieve a sufficiently high resonance frequency of the rear chamber, the volume of the rear chamber must be small enough.

[0153] However, the volume of the rear chamber also influences its acoustic capacitance Ca. A change in the acoustic capacitance Ca leads to a change in the capacitive reactance of the rear chamber, which in turn affects the vibration characteristics of the rear chamber. The specific relationship between the volume of the rear chamber and its acoustic capacitance Ca is described by formula (3): Ca=Vρc2,

[0154] Here, ρ represents the air density, c the speed of sound, and V the volume of the rear chamber.

[0155] In conjunction with formulas (2) and (3), it follows that the acoustic capacitance Ca of the rear chamber increases with increasing volume V of the rear chamber, while the corresponding resonance frequency of the rear chamber decreases. The volume V of the rear chamber must have a suitable range of values ​​to allow the rear chamber to have a large acoustic capacitance Ca while simultaneously maintaining a high resonance frequency.

[0156] As in Fig. As shown in Figure 20B, the section of chamber 115 can, in some embodiments, consist of two mutually perpendicular edges and one curved edge. By connecting the two endpoints of the curved edge, this section (e.g., section C1C2C3) can be approximated as a triangle. The hypotenuse C1C3 is formed by a connecting line between the two endpoints, which are formed by the contact of the curved surface formed on the support 115 with the two straight edges. The two straight edges C1C2 and C2C3 are formed by a basket of the converter 116, with the hypotenuse C1C3 and the straight edge C2C3 enclosing an angle α. In some embodiments, acoustic openings (e.g. sound transmission openings) must be provided in the area of ​​the basket of the sound generating part 11, in which the straight edge C2C3 is located, so that the sound generated by the vibration of the membrane 1161 can be radiated into the chamber 115.Therefore, an effective channel for sound radiation is provided between the rear of the diaphragm 1161 and the chamber 115. To ensure acoustic performance, the length of the straight edge C1C2 can be adjusted to set the size of the angle α. This changes the area of ​​the triangle C1C2C3 to adjust the volume of the chamber 115 and, in turn, to change the volume of the rear chamber. In some embodiments, the length of the straight edge C2C3 is not less than 0.67 mm due to limitations imposed by the sound passage opening. In some embodiments, the length of the straight edge C2C3 can be 0.7 mm. In some embodiments, due to the limitation on the range of values ​​of the angle α, the value of the volume V of the chamber 115 is also limited within a certain range.

[0157] Fig. Figure 20C shows a diagram of frequency response curves of a rear chamber at different angle α values ​​according to some embodiments described in this document. If the length of the straight edge BC is reduced, and thus the angle α is reduced from 67.6° to 45°, the volume V of the rear chamber, as shown in Figure 20C, is reduced. Fig. As shown in Figure 20C, the corresponding acoustic capacitance Ca of the rear chamber decreases from 7 × 10⁻¹² m³ / Pa to 2.88 × 10⁻¹² m³ / Pa, but the resonance frequency of the rear chamber increases from about 4.5 kHz to about 6 kHz. If the length of the straight edge BC is increased, thereby increasing the angle α from 67.6° to 79.11°, the volume V of the rear chamber increases, the corresponding acoustic capacitance Ca of the rear chamber increases from 7 × 10⁻¹² m³ / Pa to 15 × 10⁻¹² m³ / Pa, but the resonance frequency of the rear chamber decreases from about 4.5 kHz to about 3 kHz. It should be noted that the in Fig. The parameters shown in 20C, such as 7 × 10-12 m3 / Pa and 15 × 10-12 m3 / Pa, represent only the theoretical value of the acoustic capacitance, which corresponds to the volume of the rear chamber, and may differ from the actual data.

[0158] In some embodiments, the value of the angle α in chamber 115 can range from 45° to 79.11°. In some embodiments, the value of the angle α in chamber 115 can range from 60° to 70°. In some embodiments, the value of the angle α in chamber 115 can be 67.6°. In some embodiments, the value of the angle α in chamber 115 can range from 67° to 68°.

[0159] Fig. Figure 21 shows an exemplary representation of an internal structure of a converter according to some embodiments of the present application.

[0160] As in Fig. As shown in Figure 21, the transducer 116 is housed in the casing 111, the transducer 116 comprising a diaphragm 1161, a voice coil 1162, a basket 1163, and a magnetic circuit assembly 1164. The basket 1163 is arranged to surround the diaphragm 1161, the voice coil 1162, and the magnetic circuit assembly 1164, providing a mounting and fastening platform. The transducer 116 can be connected to the casing 111 via the basket 1163. The diaphragm 1161 covers the voice coil 1162 and the magnetic circuit assembly 1164 in the Z-direction. The voice coil 1162 projects into the magnetic circuit assembly 1164 and is then connected to the diaphragm 1161. A magnetic field generated by the current flowing through the voice coil 1162 interacts with the magnetic field formed by the magnetic circuit arrangement 1164.This causes the membrane 1161 to generate mechanical vibrations that propagate through a medium such as air and produce a sound which is emitted through the sound outlet opening 112.

[0161] In some embodiments, the magnetic circuit arrangement 1164 comprises a magnetically conductive plate 11641, a magnet 11642, and a receiving element 11643. The magnetically conductive plate 11641 and the magnet 11642 are connected to each other. A side of the magnet 11642 facing away from the magnetically conductive plate 11641 is attached to a bottom wall of the receiving element 11643, and a gap exists between the circumferential side of the magnet 11642 and the inner wall of the circumferential side of the receiving element 11643. In some embodiments, the outer wall of the circumferential side of the receiving element 11643 is connected to and fastened to the basket 1163. In some embodiments, the receiving element 11643 and the magnetically conductive plate 11641 can both be made of a magnetically conductive material (for example, iron, etc.).

[0162] In some embodiments, the circumferential side of the membrane 1161 can be connected to the basket 1163 via a retaining ring 1155. In some embodiments, the material of the retaining ring 1165 can be stainless steel or another metal to accommodate the machining and manufacturing process of the membrane 1161.

[0163] With reference to Fig. 20A and Fig. In some embodiments, the projection area of ​​the diaphragm 1161 in the Z-direction is designed to be as large as possible to improve the acoustic output (especially at low frequencies) of the sound-generating element 11 and the air-driving capacity of the diaphragm 1161. However, an excessively large diaphragm 1161 area results in an excessively large transducer 116 and, consequently, an excessively large housing 111. This can easily lead to contact and friction between the housing 111 and the ear, impairing the wearing comfort of the sound-generating element 11. Therefore, the housing 111 must be dimensioned accordingly. For example, the dimension of the short axis (which can also be referred to as the width dimension) of the housing 111 in the Y-direction can be determined based on the dimension (e.g., 17 mm) of the concha in the Y-direction.Then, based on wearing comfort, a suitable length ratio (i.e., the ratio of the dimension of the case 111 in the X-direction to its dimension in the Y-direction) is selected. Thus, the dimension (for example, 21.49 mm) of the long axis (which can also be referred to as the length dimension) of the case 111 in the X-direction is determined so that it corresponds to the dimension of the caveum conchae in the X-direction.

[0164] In some embodiments, the dimensions of the housing 111 can be selected within a predetermined range to facilitate wearing the headphones for most users by forming a chamber structure with improved acoustic performance (for example, to allow the sound-generating element 11 to be at least partially inserted into the concha or in contact with the antihelix when wearing the open-ear headphones 10). In this way, for example, when wearing the open-ear headphones 10, a first leakage structure UC and a second leakage structure LC are formed between the headphones and the user's ear to improve the headphones' acoustic performance. In some embodiments, the width dimension of the housing 111 in the Y-direction can range from 11 mm to 16 mm, depending on the width dimension of the concha in the Y-direction.In some embodiments, the width dimension of the housing 111 in the Y-direction can be between 11 mm and 15 mm. In some embodiments, the width dimension of the housing 111 in the Y-direction can be between 14 mm and 15 mm. In some embodiments, the ratio of the dimension of the housing 111 in the X-direction to its dimension in the Y-direction can be between 1.2 and 5. In some embodiments, the ratio of the dimension of the housing 111 in the X-direction to its dimension in the Y-direction can be between 1.4 and 4. In some embodiments, the ratio of the dimension of the housing 111 in the X-direction to its dimension in the Y-direction can be between 1.5 and 2. In some embodiments, the length dimension of the housing 111 in the X-direction can be in the range of 15 mm to 30 mm.In some embodiments, the length dimension of the housing 111 in the X-direction can be between 16 mm and 28 mm. In some embodiments, the length dimension of the housing 111 in the X-direction can be between 19 mm and 24 mm. In some embodiments, the thickness dimension of the housing 111 in the Z-direction can be in the range of 5 mm to 20 mm, in order to avoid impairing the wearing comfort of the open-ear headphones 10 due to an excessively large volume of the housing 111. In some embodiments, the thickness dimension of the housing 111 in the Z-direction can be between 5.1 mm and 18 mm. In some embodiments, the thickness dimension of the housing 111 in the Z-direction can be between 6 mm and 15 mm. In some embodiments, the thickness dimension of the housing 111 in the Z direction can be between 7 mm and 10 mm.In some embodiments, the area of ​​the inside IS of the housing 111 can be between 90 mm. 2 and 560 mm 2 The area of ​​the rectangular inner surface IS is equal to the product of the length and width dimensions of the housing 111. In some embodiments, the area of ​​the inner surface IS can be considered to be approximately the projection surface of the membrane 1161 in the Z-direction. For example, the deviation of the area of ​​the inner surface IS from the projection surface of the membrane 1161 in the Z-direction is 10%. In some embodiments, the area of ​​the inner surface IS can be between 150 mm². 2 and 360 mm 2 In some embodiments, the area of ​​the inner surface IS can be between 160 mm². 2 and 240 mm 2 In some embodiments, the area of ​​the inner surface IS can be between 180 mm². 2 and 200 mm 2 amount to. Based on the in Fig. 10 to Fig. The 13 described principles are carried out as described in Fig. Figure 14 illustrates this. Based on the fact that the open-ear headphone 10 offers superior comfort due to its dimensions, it exhibits better acoustic performance than existing open-ear headphones. This means that the open-ear headphone 10 can be smaller than existing open-ear headphones while maintaining the same good acoustic performance.

[0165] In some embodiments, the volume V of the rear chamber must have a suitable range of values ​​to allow the rear chamber to have a large acoustic capacitance Ca while simultaneously having a high resonant frequency. In some embodiments, the distance between the center O1 of the first pressure relief opening 1131 and the base of the magnetic circuit arrangement 1164 can be advantageously designed so that the volume of the rear chamber has a suitable range of values: See Fig. 20A and Fig. 21. If the thickness of the sound-generating part 11 in the Z-direction is fixed, the volume of the rear chamber can be larger the smaller the distance between the center O1 of the first pressure relief opening 1131 and the base of the magnetic circuit arrangement 1164 in the Z-direction. In this case, it can be seen from the above formula (3) that the acoustic capacitance Ca of the rear chamber increases, but the corresponding resonance frequency of the rear chamber decreases.In order to ensure a sufficiently high sound generation power of the sound generation part 11, a resonance frequency of the rear chamber in the suitable frequency range (for example, 2000 Hz to 6000 Hz) and sufficient wearing comfort for the user, it is therefore provided, taking into full consideration the structural strength, the difficulty of the technical implementation and the overall thickness of the housing 111, that a distance ds between the center O1 of the first pressure relief opening 1131 and the base surface of the magnetic circuit arrangement 1164 (i.e., a side of the receiving means 11643 that is away from the sound outlet opening 112 in the Z direction) is in the range of 1.31 mm to 1.98 mm. In some embodiments, the distance d5 between the center O1 of the first pressure relief opening 1131 and the base of the magnetic circuit arrangement 1164 in the Z direction is in the range of 1.31 mm to 1.98 mm.In some embodiments, the distance d5 between the center O1 of the first pressure relief opening 1131 and the base of the magnetic circuit assembly 1164 in the Z-direction is in the range of 1.41 mm to 1.88 mm. In some embodiments, the distance d5 between the center O1 of the first pressure relief opening 1131 and the base of the magnetic circuit assembly 1164 in the Z-direction is in the range of 1.51 mm to 1.78 mm. In some embodiments, the distance d5 between the center O1 of the first pressure relief opening 1131 and the base of the magnetic circuit assembly 1164 in the Z-direction is in the range of 1.56 mm to 1.72 mm. In some embodiments, it is similarly provided that the distance d6 between the center O2 of the second pressure relief opening 1132 and the base of the magnetic circuit arrangement 1164 in the Z direction is in the range of 1.31 mm to 1.98 mm.In some embodiments, the distance d6 between the center O2 of the second pressure relief opening 1132 and the base of the magnetic circuit assembly 1164 in the Z-direction is in the range of 1.41 mm to 1.88 mm. In some embodiments, the distance d6 between the center O2 of the second pressure relief opening 1132 and the base of the magnetic circuit assembly 1164 in the Z-direction is in the range of 1.51 mm to 1.78 mm. In some embodiments, the distance d6 between the center O2 of the second pressure relief opening 1132 and the base of the magnetic circuit assembly 1164 in the Z-direction is in the range of 1.56 mm to 1.72 mm.

[0166] In some embodiments, the dimension of the sound-generating part 11 in the Y-direction can be defined in order to adapt its dimensions to the dimensions of the caveum conchae. In some embodiments, the dimension of the sound-generating part 11 in the Y-direction can be determined by the distance between the center O1 of the first pressure relief opening 1131 and the median plane of the long axis of the magnetic circuit arrangement 1164, such as the one shown in Fig. The plane NN' shown in Figure 21, which is oriented perpendicularly to the drawing plane and points inwards, can be determined. In some embodiments, the distance between the center O1 of the first pressure relief opening 1131 and the median plane of the long axis of the magnetic circuit arrangement 1164, such as the one shown in Figure 21, can be determined. Fig. The plane NN' shown in Figure 21, which is oriented inwards perpendicular to the drawing plane, is defined to facilitate the design. In some embodiments, the distance between the center O1 of the first pressure relief opening 1131 and the median plane of the long axis of the magnetic circuit assembly 1164 is in the range of 5.45 mm to 8.19 mm. In the present application, the median plane of the long axis of the magnetic circuit assembly 1164 refers to a plane that runs parallel to the underside LS of the sound-generating part 11 and passes through the center of mass of the magnetic circuit assembly 1164. That is, the median plane of the long axis of the magnetic circuit assembly 1164 allows this magnetic circuit assembly 1164 to be divided into two equal parts in the X direction.The distance between the center O1 of the first pressure relief opening 1131 and the median plane of the long axis of the magnetic circuit arrangement 1164 also corresponds to the distance between the center O1 of the first pressure relief opening 1131 and the median plane of the long axis in the Y direction of the short axis. In some embodiments, the distance between the center O1 of the first pressure relief opening 1131 and the median plane of the long axis of the magnetic circuit arrangement 1164 is in the range of 5.95 mm to 8.69 mm. In some embodiments, the distance between the center O1 of the first pressure relief opening 1131 and the median plane of the long axis of the magnetic circuit arrangement 1164 is in the range of 6.45 mm to 7.19 mm.In some embodiments, the distance between the center O1 of the first pressure relief opening 1131 and the median plane of the long axis of the magnetic circuit assembly 1164 is in the range of 6.65 mm to 6.99 mm. Similarly, in some embodiments, the distance between the center O2 of the second pressure relief opening 1132 and the median plane of the long axis of the magnetic circuit assembly 1164 is in the range of 5.46 mm to 8.20 mm. In some embodiments, the distance between the center O2 of the second pressure relief opening 1132 and the median plane of the long axis of the magnetic circuit assembly 1164 is in the range of 5.96 mm to 8.70 mm. In some embodiments, the distance between the center O2 of the second pressure relief opening 1132 and the median plane of the long axis of the magnetic circuit arrangement 1164 is in the range of 6.46 mm to 7.20 mm.In some embodiments, the distance between the center O2 of the second pressure relief opening 1132 and the median plane of the long axis of the magnetic circuit arrangement 1164 is in the range of 6.66 mm to 7.00 mm.

[0167] In some embodiments, the presence of pressure relief openings 113 (for example, the first pressure relief opening 1131 and the second pressure relief opening 1132) ensures that the air pressure in the rear chamber 115, located near the pressure relief openings 113, is approximately equal to the ambient air pressure, while the air pressure in a position farther from the pressure relief openings 113 is higher than the ambient air pressure. Sound passage openings (not shown) are provided on the basket 1163, through which the rear of the diaphragm 1161 communicates with the chamber 115. Therefore, to equalize the air pressure between the rear of the diaphragm 1161 and the chamber 115, the sound passage openings on the basket can be arranged asymmetrically to better balance the airflow.In particular, it is the case that in a position farther from the first pressure relief opening 1131 and / or the second pressure relief opening 1132, the air pressure is high, which is why the dimensions of the sound passage opening can be large. In a position near the first pressure relief opening 1131 and / or the second pressure relief opening 1132, the air pressure is low, which is why the dimensions of the sound passage opening can be small. In some embodiments, it is provided that the stability of the vibration of the open-ear headphones 10 at low frequencies can be increased by adjusting the size of the dimensions (e.g., the size of the cross-sectional area) of the first pressure relief opening 1131, the second pressure relief opening 1132, and / or the sound passage openings.In some embodiments, the first pressure relief opening 1131 and the second pressure relief opening 1132 can be offset in the X-direction to achieve a more stable air pressure in the rear chamber and thus a more stable diaphragm oscillation. The projections of the first pressure relief opening 1131 and the second pressure relief opening 1132 onto the median plane of the long axis are either partially or non-coincident. In some embodiments, the area where the projections of the first pressure relief opening 1131 and the second pressure relief opening 1132 coincide with the median plane of the long axis is no larger than 10.77 mm. 2In some embodiments, it is provided that the coincident area of ​​the projections of the first pressure relief opening 1131 and the second pressure relief opening 1132 onto the median plane of the long axis is not larger than 6.77 mm. 2 In some embodiments, it is provided that the coincident area of ​​the projections of the first pressure relief opening 1131 and the second pressure relief opening 1132 onto the median plane of the long axis is not larger than 4.77 mm. 2 In some embodiments, it is provided that the coincident area of ​​the projections of the first pressure relief opening 1131 and the second pressure relief opening 1132 onto the median plane of the long axis is not larger than 2.77 mm. 2 is.

[0168] Fig.Figure 22 shows a schematic representation of the housing of the open-ear headphone in the Z direction on a plane on which the base of a magnetic circuit arrangement is located.

[0169] In some embodiments, the projection point O1 of the center of the first pressure relief opening 1131 is designated as projection point O1" in the Z-direction onto a plane containing the base of the magnetic circuit assembly 1164, and the projection point O2 of the center of the second pressure relief opening 1132 is designated as projection point O2" in the Z-direction onto a plane containing the base of the magnetic circuit assembly 1164. To offset the first pressure relief opening 1131 and the second pressure relief opening 1132 from each other in the X-direction, the length of the connecting line O1" O2" can be greater than the dimension of the short axis of the sound-generating part 11. In some embodiments, the length of the connecting line O1" O2" is in the range of 11 mm to 16 mm.In some embodiments, the length of the connecting line O1'' O2'' is in the range of 8.51 mm to 15.81 mm. In some embodiments, the length of the connecting line O1'' O2'' is in the range of 10.51 mm to 15.81 mm. In some embodiments, the length of the connecting line O1'' O2'' is in the range of 11.51 mm to 14.81 mm. In some embodiments, the length of the connecting line O1'' O2'' is in the range of 12.51 mm to 13.81 mm. In some embodiments, the ratio of the length of the connecting line O1'' O2'' to the width dimension of the sound-generating part 11 can be between 1 and 1.88.

[0170] In some embodiments, it is stipulated that the first pressure relief opening 1131 and the second pressure relief opening 1132 should not be arranged too far apart in the X-direction. If they are arranged too far apart, this easily leads to the first pressure relief opening 1131 and the second pressure relief opening 1132 being located close to the free end FE or the connecting end CE in the X-direction, causing the first pressure relief opening 1131 and / or the second pressure relief opening 1132 to be covered by the structure of the ear (for example, the flank of the cavum conchae and tragus, etc.) when wearing the open-ear headphones 10.In some embodiments, the degree of displacement between the first pressure relief opening 1131 and the second pressure relief opening 1132 in the X-direction can be related to the angle β between the line connecting O1'' O2'' and the Y direction of the short axis. In some embodiments, the angle β can be in the range of 12.85° to 23.88°. In some embodiments, the angle β can be in the range of 14.85° to 21.88°. In some embodiments, the angle β can be in the range of 16.85° to 19.88°. In some embodiments, the angle β can be in the range of 18.85° to 29.88°.

[0171] The description of the above open-ear headphone 10 serves only for illustrative purposes and is not intended to limit the scope of this application. Various changes and modifications can be made by the person skilled in the art, as described in this application. For example, if only one pressure relief opening is provided on the sound-generating part 11, the pressure relief opening can be any of the first pressure relief openings 1131 and 1132. For instance, the pressure relief opening could be the first pressure relief opening 1131 mentioned above. That is, the pressure relief opening could be located on the top surface US.It is provided that the distance between the center of the pressure relief opening and the inner surface IS can range from 4.24 mm to 6.38 mm, and that the distance between the center of the pressure relief opening and the rear surface RS can range from 10.44 mm to 15.68 mm. These changes and modifications fall within the scope of protection of the present application.

[0172] The basic concept has been described above. It is obvious to the person skilled in the art that the detailed disclosure above is merely an example and does not constitute a limitation of the present application. Although not explicitly stated, a person skilled in the art may make various modifications, improvements, and changes to the application. These modifications, improvements, and changes are indicated in the application so that they are still within the spirit and scope of the exemplary embodiments of the application. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] CN 202211336918.4

[0001] CN 202223239628.6

[0001] CN 2022 / 144339

[0001]

Claims

[1] Open-ear headphones, including: a sound-generating component comprising a transducer and a housing for the transducer; and an ear hook, wherein, in a worn state, a first part of the ear hook is suspended between the auricle and the head of a user, and a second part of the ear hook is connected to the sound-generating part to secure the sound-generating part at a location where the sound-generating part is near the ear canal without blocking the ear canal, wherein the sound-generating part is at least partially located in the cavum conchae; and wherein a sound outlet opening is provided on one inner surface of the housing facing the auricle, wherein at least two pressure relief openings, comprising a first pressure relief opening and a second pressure relief opening, are provided in the other side walls of the housing, wherein the first pressure relief opening and the second pressure relief opening are arranged offset from each other in a direction of the long axis and the distance between the center of the first pressure relief opening and the center of the second pressure relief opening is 7 mm to 15.2 mm, and wherein the direction of the long axis is a direction in which the shape of the two-dimensional projection plane of the sound-generating part extends with maximum extent. [2] Open-ear headphones according to claim 1, wherein the sound-generating part has a connecting end connected to the ear hook and a free end that is not connected to the ear hook, wherein in the worn state the free end projects into the caveum conchae and is pressed in a thickness direction and held in the caveum conchae, or whereby the free end lies against the inside of the caveum conchae in the direction of the long axis and in a direction of the short axis, wherein the thickness direction is a direction perpendicular to the two-dimensional projection plane, and wherein the direction of the long axis and the direction of the short axis are orthogonal to each other and perpendicular to the thickness direction. [3] Open-ear headphones according to claim 1, wherein there is a certain distance between the inner side and the cavum conchae, wherein the ear canal communicates with the outside environment through a gap between the inner side and the cavum conchae. [4] Open-ear headphones according to claim 3, wherein the first pressure relief opening is further away from the sound outlet opening than the second pressure relief opening, and wherein the distance between the center of the first pressure relief opening and a rear side of the sound generating part is smaller than the distance between the center of the second pressure relief opening and the rear side. [5] Open-ear headphones according to claim 4, wherein the distance between the center of the first pressure relief opening and the rear is in the range of 10.44 mm to 15.68 mm, and wherein the distance between the center of the second pressure relief opening and the rear is in the range of 13.51 mm to 20.27 mm. [6] Open-ear headphones according to claim 3, wherein the distance between the center of the first pressure relief opening and the inside is in the range of 4.24 mm to 6.38 mm. [7] Open-ear headphones according to claim 7, wherein the distance between the center of the second pressure relief opening and the inside is in the range of 4.50 mm to 5.85 mm. [8] Open-ear headphones according to claim 3, wherein the distance between the center of the first pressure relief opening and the inside is 2.24 mm to 5.57 mm, and wherein the distance between the center of the second pressure relief opening and the inside is 5.57 mm to 6.36 mm. [9] Open-ear headphones according to any one of claims 1 to 3, wherein the distance between the center of the sound outlet opening and the perpendicular plane of a connecting line between the center of the first pressure relief opening and the center of the second pressure relief opening is 0 mm to 2 mm. [10] Open-ear headphones according to claim 9, wherein the second pressure relief opening is closer to the ear canal than the first pressure relief opening, and wherein the area of ​​the second pressure relief opening is smaller than the area of ​​the first pressure relief opening. [11] Open-ear headphones according to claim 10, wherein the ratio of the area of ​​an inner opening of the second pressure relief opening to the area of ​​an inner opening of the first pressure relief opening is not greater than 0.

9. [12] Open-ear headphones according to claim 9, wherein the deviation of a first distance between the center of the first pressure relief opening and the center of the sound outlet opening from a second distance between the center of the second pressure relief opening and the center of the sound outlet opening is less than 10% of the second distance. [13] Open-ear headphones according to claim 9, wherein the first distance between the center of the first pressure relief opening and the center of the sound outlet opening is 4 mm to 15.11 mm and the second distance between the center of the second pressure relief opening and the center of the sound outlet opening is 4 mm to 16.1 mm. [14] Open-ear headphones according to any one of claims 1 to 3, wherein the transducer divides the housing into a front chamber and a rear chamber of the open-ear headphones, wherein the first pressure relief opening and the second pressure relief opening communicate with the rear chamber, and wherein the area of ​​the first pressure relief opening is in the range of 3.78 mm2 to 22.07 mm2 and the area of ​​the second pressure relief opening is in the range of 2.78 mm2 to 16.07 mm2. [15] Open-ear headphones according to claim 1, wherein the transducer comprises a magnetic circuit arrangement used to provide a magnetic field, wherein the length of a connecting line between a projection point of the center of the first pressure relief opening and a projection point of the center of the second pressure relief opening onto a plane in which a base surface of the magnetic circuit arrangement is located is in the range of 8.51 mm to 15.81 mm, and wherein the ratio of the length of the connecting line to the width dimension of the sound-generating part in the direction of the short axis is between 1 and 1.

88. [16] Open-ear headphones according to claim 15, wherein the direction of the short axis of the sound generating part is orthogonal to the direction of the long axis and perpendicular to the thickness direction, wherein the angle between the connecting line and the direction of the short axis of the housing is in the range of 12.85° to 23.88°, and wherein the thickness direction is a direction perpendicular to the two-dimensional projection plane. [17] Open-ear headphones according to claim 1, wherein the first pressure relief opening is provided on a top side of the housing and the second pressure relief opening is provided on a bottom side of the housing.

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