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 hangs between the auricle and the head of a user, and wherein a second part of the ear hook extends towards a side of the auricle facing away from the head and is connected to the sound-generating part in order to secure the sound-generating part at a location where the sound-generating part is near the ear canal without blocking the ear canal, the transducer includes a diaphragm, a sound outlet opening is provided on one of the inner sides of the housing facing the ear, which is used to direct sound generated by the vibration of the diaphragm out of the housing and then transmit it to the ear canal, and The ratio of the area of ​​the sound exit opening to the projection area of ​​the membrane in its direction of vibration is in the range of 0.016 to 0.261.

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 field

[0002] The present application relates to the technical field of acoustics, in particular to 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. Disclosure of the invention

[0005] One embodiment of the present application provides an open-ear headphone comprising: a sound-generating part comprising a transducer and a housing for receiving the transducer;and an ear hook, wherein, in a worn state, a first part of the ear hook hangs between the auricle and the head of a user, and wherein a second part of the ear hook extends towards a side of the auricle facing away from the head and is connected to the sound-generating part in order 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 a sound outlet opening is provided on an inner surface of the housing facing the auricle, which is used to direct sound generated by the transducer out of the housing and then transmit it to the ear canal, and wherein the ratio of the area of ​​the sound outlet opening to the area of ​​the inner surface provided with the sound outlet opening is in the range of 0.015 to 0.25.

[0006] In some embodiments, it is provided that in the worn state the housing is at least partially inserted into the cave conchae, and wherein the sound outlet opening has a cross-sectional area of ​​2.87 mm² 2 up to 46.10 mm 2 and the inside has an area of ​​160 mm 2 up to 240 mm 2 exhibits.

[0007] In some embodiments, the square ratio of the cross-sectional area to the depth of the sound outlet opening is 0.31 to 512.2.

[0008] In some embodiments, the depth of the sound outlet opening is provided to be in the range of 0.3 mm to 3 mm.

[0009] In some embodiments, the distance between the center of the sound outlet opening and an underside of the sound generating part is in the range of 4.05 mm to 6.05 mm.

[0010] In some embodiments, the distance between the center of the sound outlet opening and a rear side of the sound generating part is in the range of 8.15 mm to 12.25 mm.

[0011] In some embodiments, the transducer includes a magnetic circuit arrangement for providing a magnetic field, wherein the distance between the center of the sound outlet opening and a base surface of the magnetic circuit arrangement is in the range of 5.65 mm to 8.35 mm.

[0012] In some embodiments, the distance between the center of the sound outlet opening and a median plane of a long axis of the magnetic circuit arrangement is in the range of 1.45 mm to 2.15 mm.

[0013] In some embodiments, it is provided that, when worn, the distance between the center of the sound outlet opening and an upper apex of the ear hook is in the range of 22.5 mm to 34.5 mm.

[0014] In some embodiments, it is provided that, in the worn state, the distance from a projection of the center of the sound outlet opening onto the sagittal plane to a projection of an upper vertex of the ear hook onto the sagittal plane is in the range of 18 mm to 30 mm.

[0015] In some embodiments, it is provided that, when worn, the ratio of the distance between the center of the sound outlet opening and the upper apex of the ear hook to the distance between the upper and lower boundaries of the inner surface is 1.2 to 2.2.

[0016] In some embodiments, it is provided that, in the worn state, the ratio of the distance between the center of the sound outlet opening and the upper apex of the ear hook to a distance between the center of the sound outlet opening and a top surface of the sound generating part is 1.94 to 2.93.

[0017] In some embodiments, the distance from a projection point of the center of the sound outlet opening onto the sagittal plane to a projection point of the center of the ear canal opening onto the sagittal plane is in the range of 2.2 mm to 3.8 mm.

[0018] In some embodiments, the distance from a projection point of the center of the sound outlet opening onto the sagittal plane to a projection point of a center point of the upper boundary of the inside onto the sagittal plane is in the range of 10.0 mm to 15.2 mm.

[0019] In some embodiments, the distance from the projection point of the center of the upper boundary of the inner surface onto the sagittal plane to the projection point of the center of the ear canal opening onto the sagittal plane is in the range of 12 mm to 18 mm.

[0020] In some embodiments, the distance from a projection point of the center of the sound outlet opening onto the sagittal plane to a projection point of a point on the third of the lower boundary of the inside onto the sagittal plane is in the range of 3.5 mm to 5.6 mm.

[0021] In some embodiments, the distance from the projection point of the point at the third of the lower boundary of the inner side onto the sagittal plane to the projection point of the center of the ear canal opening onto the sagittal plane is in the range of 1.7 mm to 2.7 mm.

[0022] In some embodiments, it is provided that in the worn state the housing is at least partially located on the antihelix and the distance between the center of the sound outlet opening and an underside of the sound generating part is in the range of 2.3 mm to 3.6 mm.

[0023] In some embodiments, the distance between the center of the sound outlet opening and a rear side of the sound generating part is in the range of 9.5 mm to 15.0 mm.

[0024] In some embodiments, it is provided that, when worn, the distance between the center of the sound outlet opening and an upper apex of the ear hook is in the range of 17.5 mm to 27.0 mm.

[0025] In some embodiments, it is provided that, when worn, the ratio of the distance between the center of the sound outlet opening and the upper apex of the ear hook to the distance between the upper and lower boundaries of the inner surface is 0.95 to 1.55.

[0026] In some embodiments, it is provided that, in the worn state, the ratio of the distance between the center of the sound outlet opening and the upper apex of the ear hook to a distance between the center of the sound outlet opening and a top surface of the sound generating part is 1.19 to 2.50.

[0027] In some embodiments, the distance between the center of the sound outlet opening and a plane in which the ear hook is located is 3 mm to 6 mm.

[0028] In some embodiments, the ratio of the dimension of a long axis to the dimension of a short axis of the sound outlet opening is in the range of 1 to 10.

[0029] In some embodiments, the ratio of the dimension of the long axis to the dimension of the short axis of the sound outlet opening is in the range of 2 to 4.

[0030] One embodiment in the present description further provides an open-ear headphone comprising: a sound generation part comprising a transducer and a housing for receiving the transducer;and an ear hook, wherein, in a worn state, a first part of the ear hook hangs between the auricle and the head of a user, and wherein a second part of the ear hook extends towards a side of the auricle facing away from the head and is connected to the sound-generating part to attach the sound-generating part at a location where the sound-generating part is near the ear canal without blocking the ear canal, wherein the transducer comprises a diaphragm and a sound outlet opening is provided on an inner surface of the housing facing the auricle, which is used to draw sound generated by the vibration of the diaphragm out of the housing and then transmit it to the ear canal, and wherein the ratio of the area of ​​the sound outlet opening to the projection area of ​​the diaphragm in its direction of vibration is in the range of 0.016 to 0.261.

[0031] In some embodiments, it is provided that in the worn state the housing is at least partially inserted into the cave conchae, with the sound outlet having a cross-sectional area of ​​2.87 mm². 2 up to 46.10 mm 2 exhibits, and wherein the projection area of ​​the membrane in its direction of vibration is 150 mm 2 up to 230 mm 2 amounts.

[0032] One embodiment in the present description further provides an open-ear headphone comprising: a sound generation part comprising a transducer and a housing for receiving the transducer;and an ear hook, wherein, in a worn state, a first part of the ear hook hangs between the auricle and the head of a user, and wherein a second part of the ear hook extends towards a side of the auricle facing away from the head and is connected to the sound-generating part to attach the sound-generating part at a location where the sound-generating part is near the ear canal without blocking the ear canal, wherein the transducer comprises a diaphragm and a sound outlet opening is provided on an inner surface of the housing facing the auricle, which is used to draw sound generated by the vibration of the diaphragm out of the housing and then transmit it to the ear canal, and wherein the distance between the center of the sound outlet opening and an upper apex of the ear hook is in the range of 22.5 mm to 34.5 mm. Brief description of the characters

[0033] 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 description; 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 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 10A 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 10B 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 11A shows a schematic representation of the chamber structure with two horizontal openings according to some embodiments of the present application; Fig. Figure 11B shows a schematic representation of the chamber structure with two vertical openings according to some embodiments of the present application; Fig. Figure 12 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 13 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 14 shows a schematic structural representation of one side of the open-ear headphones facing the ear. Fig. 13; Fig. Figure 15 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 description; Fig. Figure 16A shows an exemplary representation of an internal structure of a sound-generating part according to some embodiments of the present description; Fig. Figure 16B shows an exemplary representation of an internal structure of a converter according to some embodiments of the present description; Fig. Figure 17A shows a diagram of frequency response curves of an open-ear headphone corresponding to the sound outlet openings with different cross-sectional areas at a specific aspect ratio according to some embodiments of the present description; Fig. Figure 17B shows a diagram of frequency response curves of a front chamber corresponding to the sound outlet openings with different cross-sectional areas according to some embodiments of the present description; Fig. Figure 18A shows a diagram of frequency response curves of an open-ear headphone corresponding to the sound outlet openings at different aspect ratios according to some embodiments of the present description; and Fig. Figure 18B shows a diagram of frequency response curves of a front chamber corresponding to the sound outlet openings with different depths according to some embodiments of the present description. Detailed descriptions

[0034] 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.

[0035] 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.

[0036] 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.

[0037] In the explanation of this description, it should be understood that the terms "first," "second," "third," and "fourth," etc., serve only for descriptive purposes and do not indicate or suggest 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 these features. In the explanation of this description, the word "several" refers to at least two, such as two, three, etc., unless expressly defined otherwise.

[0038] In this description, 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 permanent, 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 between the two elements, unless expressly defined otherwise. A person competent in the field may understand the specific meaning of the above terms in the description according to the specific circumstances.

[0039] 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.

[0040] Individual variations may occur among different users, resulting in different ear shapes, sizes, and other dimensions. For the sake of clarity and better understanding, unless otherwise stated, this description primarily uses a standard-shaped and standard-sized ear model as a reference to illustrate how the acoustic devices are worn in various embodiments. Based on standards ANSI S3.36, S3.25, and IEC 60318-7, 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) have values ​​within different ranges in order to adapt to different ears.

[0041] 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 in the front-to-back direction 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 in the left-to-right direction 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.

[0042] Fig. Figure 2 shows an exemplary structural representation of an open-ear headphone according to some embodiments of the present description.

[0043] 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.

[0044] 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.

[0045] 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 16A 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, the diaphragm) into a front chamber (for example, a front chamber 114, as shown in Figure 16A). Fig. (as shown in Figure 16A) and a rear chamber. The sound outlet 112 can communicate with the front chamber to then draw the sound generated in the front chamber out of the housing 111 and then transmit it to the ear canal. In some embodiments, part of the sound drawn out via the sound outlet 112 can propagate to the ear canal so that the user can hear the sound, and another part of it, together 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 an initial sound loss in the far field.In addition, one or more pressure relief openings 113 are generally provided on another side (for example, a side away from or facing away from the user's ear canal) of the housing 111. Compared to the sound outlet opening 112, the pressure relief opening 113 is located further away from the ear canal. The sound emitted from the pressure relief opening 113 generally results in a second sound loss in the far field, the magnitude of which is comparable to that of the second sound loss. The phase of the first sound loss and the phase of the second sound loss 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.For further explanations of the sound generation part 11, reference is made to the other sections of this description, for example to . Fig. 7, Fig. 13, Fig. 16A etc. and their explanations.

[0046] 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 designed 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 ear and the user's head. In some embodiments, the ear hook 12 can also be designed 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 part (a first part 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 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, when worn, do not cover the external auditory canal 101 of the ear.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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. This prevents the sound-generating part 11 from covering the ear canal, thus freeing both of the user's ears. Additionally, 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.

[0051] 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 outer 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.

[0052] 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.

[0053] Combined 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. Sound can be transmitted 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.

[0054] It should be noted that the method for measuring sound loss in this description 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, evenly 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 or may not lie on the line connecting the two point sound sources.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.

[0055] 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.

[0056] 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.

[0057] 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 various frequencies according to some embodiments of the present description. 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.

[0058] 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, 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.

[0059] 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 described in this document. 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.

[0060] Fig. Figure 6 shows a diagram of the sound loss indices for the dipole sound source with and without the baffle arranged between two sound sources, according to some embodiments described in this document. 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.

[0061] Fig. Figure 7 shows a schematic representation of an open-ear headphone in an exemplary worn state according to some embodiments of the present description. Fig. Figure 8 shows a schematic structural representation of one side of the open-ear headphones facing the ear. Fig. 7.

[0062] 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 not connected to 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.

[0063] 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 refer to a side of the sound-generating part 11 facing the back of the head in the Y direction when worn.To facilitate explanation, the present embodiment is described using the example of 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.

[0064] 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 directed from the housing 111, and sound directed through 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 dampen 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.

[0065] 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.

[0066] 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.

[0067] 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.In some embodiments, the distance d1 from the center O of the sound outlet opening 112 in the rear RS in the X-direction to the rear RS of the sound-generating part 11 is in the range of 9.5 mm to 15.0 mm, provided 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, so that the projection of the sound outlet opening 112 onto the sagittal plane lies at least partially within the cymba conchae 103, i.e., so that the sound outlet opening 112 is at least partially directly opposite the cymba conchae 103 when actually worn. In some embodiments, the distance d1 from the center O of the sound outlet opening 112 in the X-direction to the rear RS of the sound-generating part 11 is in the range of 10.5 mm to 14.0 mm.In some embodiments, the distance d1 from the center O of the sound outlet opening 112 in the X-direction to the rear RS of the sound-generating part 11 is in the range of 11.0 mm to 13.5 mm. In some embodiments, the distance d1 from the center O of the sound outlet opening 112 in the X-direction to the rear RS of the sound-generating part 11 is in the range of 11.5 mm to 13.0 mm. In some embodiments, the distance d1 from the center O of the sound outlet opening 112 in the X-direction to the rear RS of the sound-generating part 11 is in the range of 12.0 mm to 12.5 mm.

[0068] It can be seen that the respective side walls of the housing 111 have a certain thickness due to the inclusion of the sound outlet opening 112 and the pressure relief openings 113 in the housing 111. Therefore, the sound outlet opening 112 and the pressure relief openings 113 are holes of a certain depth. In this case, the sound outlet opening 112 and the pressure relief opening 113 can each have inner and outer openings. For the sake of simplicity, the center O of the sound outlet opening 112, as described above and below, can refer in this description to the centroid of the outer opening of the sound outlet opening 112. In some embodiments, the rear surface RS of the headphones can be designed as an arc to improve the aesthetics and wearing comfort of the headphones.If the back side RS is designed as an arc surface, the distance from a position (for example, the center O of the sound outlet opening 112) to the back side RS can refer to a distance from the position to a tangential surface of the back side RS that is furthest from the center of the sound generating part and runs parallel to its short axis.

[0069] In the present description, the sound outlet opening 112 and the pressure relief opening 113, which are in communication with the front and rear chambers respectively, are each designated as the point sound source A1 and the point sound source A2, as shown in Fig. 5 shown, can be considered, and that the ear canal is considered the in 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 between the sound outlet opening 112 and the pressure relief opening 113 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 is designed to increase the distance between the sound outlet opening 112 and the pressure relief opening 113 to the ear canal, thus increasing the sound intensity at the ear canal 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 the pressure relief opening 113 can be located in a position away from the sound outlet 112. For example, the pressure relief opening 113 can be located on the outer side OS or the upper side US, away from the sound outlet 112. The sound wave from the pressure relief opening 113 must first pass over the outer side of the sound-generating part 11 before it can interfere with the sound wave from the sound outlet 112 in the ear canal. Furthermore, convex orConcave structures (for example, the antihelix along the propagation path) on the auricle also increase the interval for the transmission of sound from the pressure relief opening 113 to the ear canal. Thus, the sound-generating part 11 itself and / or the auricle correspond to the baffle between the sound outlet opening 112 and the pressure relief opening 113. The baffle increases the interval from the pressure relief opening 113 to the ear canal and reduces the intensity of the sound wave from the pressure relief opening 113 at the ear canal, so that the cancellation of the sound from both the sound outlet opening 112 and the pressure relief opening 113 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 pressure relief opening 113 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 positioning the sound outlet opening 112 and the pressure relief opening 113 appropriately, the volume at the ear canal can be considerably increased without significantly increasing the volume of sound loss.

[0070] Combined with Fig. In some embodiments, the sound intensity through the sound outlet opening 112 at the ear canal (i.e., at the listening position) is improved by arranging the sound outlet opening 112 closer to the ear canal. That is, the sound outlet opening 112 can be located closer to the underside LS of the sound-generating part 11 in the Y-direction. In some embodiments, the distance h1 from the center O of the sound outlet opening 112 in the Y-direction to the underside LS of the sound-generating part 11 is in the range of 2.3 mm to 3.6 mm. In other embodiments, the distance h1 from the center O of the sound outlet opening 112 in the Y-direction to the underside LS of the sound-generating part 11 is in the range of 2.5 mm to 3.4 mm. In some embodiments, the distance h1 from the center O of the sound outlet opening 112 in the Y direction to the underside LS of the sound generating part 11 is in the range of 2.7 mm to 3.2 mm.In some embodiments, the distance h1 from the center O of the sound outlet opening 112 in the Y-direction to the underside LS of the sound-generating part 11 is in the range of 2.8 mm to 3.1 mm. In some embodiments, the distance h1 from the center O of the sound outlet opening 112 in the Y-direction to the underside LS of the sound-generating part 11 is in the range of 2.9 mm to 3.0 mm.

[0071] In some embodiments, with reference to Fig. 7. It is provided that, in the user-worn open-ear headphones 10, the distance between the center O of the sound outlet 112 and the upper apex M of the ear hook 12 is in the range of 17.5 mm to 27.0 mm, so that the projection of the sound outlet 112 onto the sagittal plane of the worn open-ear headphones 10 can lie partially or completely within the region of the cymba conchae. The upper apex of the ear hook 12 refers to a point on the ear hook 12 that is closest to the head in one direction of the vertical axis. In some embodiments, it is provided that, in the user-worn open-ear headphones 10, the distance between the center O of the sound outlet 112 and the upper apex M of the ear hook 12 is in the range of 20.0 mm to 25.5 mm.In some embodiments, the distance between the center O of the sound outlet 112 and the upper apex M of the ear hook 12 of the user-worn open-ear headphones 10 is in the range of 21.0 mm to 24.5 mm. In some embodiments, the distance between the center O of the sound outlet 112 and the upper apex M of the ear hook 12 of the user-worn open-ear headphones 10 is in the range of 22.0 mm to 23.5 mm. In some embodiments, the distance between the center O of the sound outlet 112 and the upper apex M of the ear hook 12 of the user-worn open-ear headphones 10 is in the range of 22.5 mm to 23.0 mm.

[0072] In some embodiments, it is provided that the ratio of the distance between the center O of the sound outlet opening 112 and the upper apex M of the ear hook 12 to the distance between the upper and lower boundaries of the inner surface IS (i.e., the distance between the top US and the bottom LS of the sound generating part 11 or the housing 111) should be neither too large nor too small.In some embodiments, the distance between the upper surface US and the lower surface LS can refer to a distance from a tangential surface of the upper surface US, located furthest from the center of the sound-generating part and parallel to the long axis of the sound-generating part, to a tangential surface of the lower surface LS, located furthest from the center of the sound-generating part and parallel to the long axis of the sound-generating part, provided that the upper surface US and / or the lower surface LS each represent an arcuate surface. If the distance between the center O of the sound outlet opening 112 and the upper apex M of the ear hook 12 is determined and the above ratio is too small, the width dimension of the inner surface IS may be too large.In this case, the overall weight of the sound-generating component can become too high, and the distance between the housing and the ear hook can become too small, causing discomfort for the user. If the above ratio is too high, the width dimension of the inner surface (IS) can be too small, resulting in an insufficient area over which air can be driven by the transducer of the sound-generating component (11), leading to insufficient sound output from the sound-generating component.To ensure sufficiently high sound generation power of the sound-generating element and to improve user comfort, as well as to allow the projection of the sound outlet opening 112 onto the sagittal plane to lie at least partially within the region of the cymba conchae, the ratio of the distance between the center O of the sound outlet opening 112 and the upper apex M of the ear hook 12 to the distance between the upper and lower boundaries of the inner surface IS of the open-ear headphones 10 worn by the user is 0.95 mm to 1.55 mm. In some embodiments, the ratio of the distance between the center O of the sound outlet opening 112 and the upper apex M of the ear hook 12 to a width dimension of the housing 111 is 1.05 to 1.45.In some embodiments, the ratio of the distance between the center O of the sound outlet opening 112 and the upper apex M of the ear hook 12 to a width dimension of the housing 111 is 1.15 to 1.35. In some embodiments, the ratio of the distance between the center O of the sound outlet opening 112 and the upper apex M of the ear hook 12 to a width dimension of the housing 111 is 1.20 to 1.30.

[0073] Regarding the way of wearing Fig. 7. The ratio of the distance between the center O of the sound outlet 112 and the upper apex M of the ear hook 12 to the distance between the center O of the sound outlet 112 and the top US of the sound-generating part 11 should not be too large, since the sound outlet 112 is located closer to the ear canal on the inner side IS. Furthermore, the ratio of the distance between the center O of the sound outlet 112 and the upper apex M of the ear hook 12 to the distance between the center O of the sound outlet 112 and the top US of the sound-generating part 11 should not be too small, in order to ensure that there is sufficient clearance between the sound-generating part 11 and the upper apex M of the ear hook 12 (thus preventing excessive pressure on the ear from the sound-generating part 11 and the ear hook 12).In some embodiments, the ratio of the distance between the center O of the sound outlet opening 112 and the upper apex M of the ear hook 12 to the distance between the center O of the sound outlet opening 112 and the top surface US of the sound-generating part 11 in the user-worn open-ear headphones 10 is between 1.19 and 2.5. Preferably, the ratio of the distance between the center O of the sound outlet opening 112 and the upper apex M of the ear hook 12 to the distance between the center O of the sound outlet opening 112 and the top surface US of the sound-generating part 11 is between 1.5 and 1.8.

[0074] Regarding the way of wearing Fig. 7. The ratio of the distance between the center O of the sound outlet opening 112 and the upper apex M of the ear hook 12 to the distance between the center O of the sound outlet opening 112 and the underside IS of the sound-generating part 11 should not be too small, since the sound outlet opening 112 is located closer to the ear canal on the inner side IS. To ensure that the sound outlet opening has a sufficient area (thus avoiding excessive acoustic impedance caused by an insufficiently large sound outlet opening area), the width of the sound outlet opening 112 should not be too small. Therefore, the ratio of the distance between the center O of the sound outlet opening 112 and the upper apex M of the ear hook 12 to the distance between the center O of the sound outlet opening 112 and the underside IS of the sound-generating part 11 should not be too small.In some embodiments, the ratio of the distance between the center O of the sound outlet opening 112 and the upper apex M of the ear hook 12 to the distance h3 between the center O of the sound outlet opening 112 and the underside IS of the sound-generating part 11 in the user-worn open-ear headphones 10 is between 6.03 and 9.05. Preferably, the ratio of the distance between the center O of the sound outlet opening 112 and the upper apex M of the ear hook 12 to the distance between the center O of the sound outlet opening 112 and the underside IS of the sound-generating part 11 is between 7 and 8.

[0075] 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 9 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 description.

[0076] As in Fig. As shown in Figure 9, 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 description, 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. Due to the partially enclosed structure, the interior is not completely sealed off 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, or the like, or any combination thereof.

[0077] 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.

[0078] Fig. Figure 10A shows a schematic representation of a principle of hearing in a structure of the 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 description. Fig. Figure 10B shows a schematic representation of a sound loss principle in the structure of the dipole sound source and the chamber structure formed around one of the sound sources of the dipole sound source according to some embodiments of the present description.

[0079] Regarding near-field hearing, a dipole of the chamber structure around one of the in Fig. The sound sources shown in Figure 10A are formed around the chamber structure. Because one of the sound sources A is enclosed by the chamber structure, the sound emitted from it can mostly reach 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.

[0080] As in Fig. As shown in Figure 10B, 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 the secondary sound source A' is equal to the magnitude 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.

[0081] 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.

[0082] Fig. Figure 11A shows a schematic representation of the chamber structure with two horizontal openings according to some embodiments of the present description. Fig. Figure 11B shows a schematic representation of the chamber structure with two vertical openings according to some embodiments described in this document. If two connecting lines between the openings and two connecting lines between the sound sources are parallel to each other (i.e., two horizontal openings), the distances from the two openings to the external sound source are assumed to be their maximum and minimum distances, respectively, as shown in Figure 11B. Fig. Figure 11A shows that 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 Figure 11A. Fig. 11B shown.

[0083] Fig. Figure 12 shows a comparison diagram of audibility index curves for chamber structures with two openings and one opening, respectively, according to some embodiments described in this document. As in Fig. As shown in Figure 12, the overall audibility index is reduced by the chamber structure with identical openings compared to the chamber structure with a single opening. In 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. 11A, Fig. 11B and Fig. 12. It is evident that the audibility index of the leakage structure with the same opening rate is higher than that of the leakage structure 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. 11A, Fig. 11B and Fig. 12. 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.

[0084] As in Fig. As shown in Figure 12, 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 one 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 range. 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.

[0085] Fig. Figure 13 shows a schematic representation of an open-ear headphone in an exemplary worn state according to some further embodiments of the present description. Fig. Figure 14 shows a schematic structural representation of one side of the open-ear headphones facing the ear. Fig. 13.

[0086] The in Fig. 13 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.

[0087] In some embodiments, when worn, the front 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, to facilitate the insertion of the free end FE into the conchal cavity. The angle between the direction X of the long axis and the direction of the sagittal axis of the human body can be between 15° and 60°. 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. Conversely, if this angle is too large, the sound-generating part 11 may 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.

[0088] 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.

[0089] In some embodiments, the elasticity of the ear hook allows the distance between the sound-generating element and the ear hook to change to a certain extent when worn and not worn (i.e., the distance is smaller when not worn than when worn). Furthermore, due to the physiological structure of the ear 100, a certain distance should exist between the plane in which the sound-generating element 11 is located and the plane in which the ear hook 12 is located, in the direction of the coronal axis, so that the sound-generating element 11 can exert suitable pressure on the ear 100.In some embodiments, the distance from the center O of the sound outlet opening 112 to the plane in which the ear hook 12 is located is between 3 mm and 6 mm when the headphones are not being worn. This improves the wearing comfort of the open-ear headphones 10 and ensures that the sound-generating element 11 is pressed against the ear by the interaction of the sound-generating element 11 and the ear hook 12. Since the ear hook 12 has an irregular shape, it can, for example, be designed with an arc-shaped structure. The plane in which the ear hook 12 is located (also referred to as the ear hook plane) can be considered as follows: When the ear hook lies flat on a plane in its not-worn state, this plane is tangent to the ear hook at at least three points, thus forming the ear hook plane.In some embodiments, the earpiece can be considered almost perfectly fitted to the head when worn, with the deflection of the earpiece plane relative to the sagittal plane being negligible. In some embodiments, the distance from the center O of the sound outlet opening 112 to the plane of the earpiece 12 is between 3.5 mm and 5.5 mm when not worn. In some embodiments, the distance from the center O of the sound outlet opening 112 to the plane of the earpiece 12 is between 4.0 mm and 5.0 mm when not worn. In some embodiments, the distance from the center O of the sound outlet opening 112 to the plane of the earpiece 12 is between 4.3 mm and 4.7 mm when not worn.

[0090] As in Fig. As shown in Figure 13, 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. 9 chamber structure 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 9 can be considered. The sound outlet opening 112 provided on the inside IS can be considered a point sound source within the in Fig. The chamber structure 41 shown in Figure 9 can be considered. The pressure relief openings 113 provided on another side (for example, on a side away from or facing away from the user's ear canal) of the sound-generating part 11 can be considered as a point sound source outside the chamber structure shown in Figure 9. Fig. The chamber structure shown in Figure 9 is considered in Figure 41. Based on a relevant description using the following methods... Fig. 9 to 12, 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 13. Simultaneously, only a small portion of the out-of-phase sound emitted from the pressure relief openings 113 passes through the gap (the first leakage structure UC and the second leakage structure LC) into the concha. The 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 effect 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 out-of-phase sound generated by the pressure relief openings 113 in the far field, thereby ensuring the desired effect of reducing sound loss.

[0091] Combined with Fig. 13 and Fig. In some embodiments, the sound outlet 112 is arranged as close as possible to the ear canal, so that when wearing open-ear headphones 10, the projection of the sound outlet 112 onto the sagittal plane can lie partially or completely within the area of ​​the conchal cavity, and at the same time the sound intensity through the sound outlet 112 at the ear canal (i.e., at the listening position) is improved. In some embodiments, the distance h2 from the center O of the sound outlet 112 in the Y-direction to the underside LS of the sound-generating part 11 is in the range of 4.05 mm to 6.05 mm. In some embodiments, the distance h2 from the center O of the sound outlet 112 in the Y-direction to the underside LS of the sound-generating part 11 is in the range of 4.50 mm to 5.85 mm.In some embodiments, the distance h2 from the center O of the sound outlet opening 112 in the Y-direction to the underside LS of the sound-generating part 11 is in the range of 4.80 mm to 5.50 mm. In some embodiments, the distance h2 from the center O of the sound outlet opening 112 in the Y-direction to the underside LS of the sound-generating part 11 is in the range of 5.20 mm to 5.55 mm.

[0092] In some embodiments, the dimension of the long axis of the sound-generating part 11 should not be too large, so that the sound-generating part 11 can be at least partially embedded in the cavity. Provided that the insertion of at least part of the sound-generating part 11 into the cavity is ensured, the distance from the center O of the sound outlet opening 112 in the X-direction to the rear side RS of the sound-generating part 11 cannot be too small. Otherwise, the entire area or part of the area of ​​the sound outlet opening may be obscured by the free end FE resting against the wall surface of the cavity, thus reducing the effective area of ​​the sound outlet opening. Therefore, in some embodiments, the distance d2 from the center O of the sound outlet opening 112 in the X-direction to the rear side RS of the sound-generating part 11 is in the range of 8.15 mm to 12.25 mm.In some embodiments, the distance d2 from the center O of the sound outlet opening 112 in the X-direction to the rear RS of the sound-generating part 11 is in the range of 8.50 mm to 12.00 mm. In some embodiments, the distance d2 from the center O of the sound outlet opening 112 in the X-direction to the rear RS of the sound-generating part 11 is in the range of 8.85 mm to 11.65 mm. In some embodiments, the distance d2 from the center O of the sound outlet opening 112 in the X-direction to the rear RS of the sound-generating part 11 is in the range of 9.25 mm to 11.15 mm. In some embodiments, the distance d2 from the center O of the sound outlet opening 112 in the X-direction to the rear RS of the sound-generating part 11 is in the range of 9.60 mm to 10.80 mm.

[0093] Provided that the insertion of at least part of the sound-generating part 11 into the cave conchae is ensured, in some embodiments with reference to Fig. 13 provides that the distance between the center O of the sound outlet opening 112 and the upper apex M of the ear hook 12 in the user-worn open-ear headphones 10 is in the range of 22.5 mm to 34.5 mm, so that the projection of the sound outlet opening 112 onto the sagittal plane can lie partially or completely within the region of the conchal cavity. In some embodiments, it is provided that the distance between the center O of the sound outlet opening 112 and the upper apex M of the ear hook 12 in the range of 25 mm to 32 mm in the user-worn open-ear headphones 10. In some embodiments, it is provided that in the user-worn open-ear headphones 10, the distance between the center O of the sound outlet opening 112 and the upper apex M of the ear hook 12 is in the range of 27.5 mm to 29.5 mm.In some embodiments, the distance between the center O of the sound outlet 112 and the upper apex M of the ear hook 12 is in the range of 28 mm to 29 mm when the open-ear headphones 10 are worn by the user. In some embodiments, the distance between the projection of the center O of the sound outlet 112 onto the sagittal plane and the projection of the upper apex of the ear hook 12 onto the sagittal plane is in the range of 18 mm to 30 mm when the open-ear headphones 10 are worn by the user.

[0094] In some embodiments, the ratio of the distance O between the center of the sound outlet opening 112 and the upper apex M of the ear hook 12 to the distance between the upper and lower boundaries of the inner surface IS (i.e., the distance between the top US and the bottom LS of the sound-generating part 11 or the housing 111) should be neither too large nor too small. If the distance O between the center of the sound outlet opening 112 and the upper apex M of the ear hook 12 is too small and the above ratio is too small, the width of the inner surface IS may be too large. In this case, the overall weight of the sound-generating part may become too high and the distance between the housing and the ear hook too small, causing discomfort for the user.If the above ratio is too large, the width dimension IS of the inner surface may be too small, resulting in an insufficient area over which air can be driven by the transducer of the sound-generating element 11, leading to insufficient sound generation power from the sound-generating element. Therefore, to ensure sufficiently high sound generation power from the sound-generating element, improve user comfort, and allow the projection of the sound outlet 112 onto the sagittal plane to lie at least partially within the area of ​​the conchal cavity and to position the sound outlet as close as possible to the ear canal, the ratio of the distance between the center O of the sound outlet 112 and the upper apex M of the ear hook 12 to the width dimension of the housing 111 in the Y-direction for the open-ear headphones 10 worn by the user is 1.2 to 2.2.In some embodiments, the ratio of the distance between the center O of the sound outlet opening 112 and the upper apex M of the ear hook 12 to a width dimension of the housing 111 is 1.4 to 2.0 in the user-worn open-ear headphones 10. In some embodiments, the ratio of the distance between the center O of the sound outlet opening 112 and the upper apex M of the ear hook 12 to a width dimension of the housing 111 is 1.5 to 1.8 in the user-worn open-ear headphones 10. In some embodiments, it is provided that in the user-worn open-ear headphones 10, the ratio of the distance between the center O of the sound outlet opening 112 and the upper apex M of the ear hook 12 to a width dimension of the housing 111 is 1.6 to 1.7.

[0095] Regarding the way of wearing Fig. 13. The ratio of the distance between the center O of the sound outlet 112 and the upper apex M of the ear hook 12 to the distance between the center O of the sound outlet 112 and the upper surface US of the sound-generating part 11 should not be too large, since the sound outlet 112 is located closer to the ear canal on the inner surface IS. Furthermore, the ratio of the distance between the center O of the sound outlet 112 and the upper apex M of the ear hook 12 to the distance between the center O of the sound outlet 112 and the upper surface US of the sound-generating part 11 should not be too small, in order to ensure that there is sufficient distance between the sound-generating part 11 and the upper apex M of the ear hook 12 to allow it to protrude into the concha.In some embodiments, the ratio of the distance between the center O of the sound outlet opening 112 and the upper apex M of the ear hook 12 to the distance between the center O of the sound outlet opening 112 and the top surface US of the sound-generating part 11 in the user-worn open-ear headphones 10 is between 1.94 and 2.93. Preferably, the ratio of the distance between the center O of the sound outlet opening 112 and the upper apex M of the ear hook 12 to the distance between the center O of the sound outlet opening 112 and the top surface US of the sound-generating part 11 in the user-worn open-ear headphones 10 is between 2.2 and 2.6.

[0096] Regarding the way of wearing Fig. 13. The ratio of the distance between the center O of the sound outlet opening 112 and the upper apex M of the ear hook 12 to the distance between the center O of the sound outlet opening 112 and the underside IS of the sound-generating part 11 should not be too small, since the sound outlet opening 112 is located closer to the ear canal on the inner side IS. To ensure that the sound outlet opening has a sufficient area (thus avoiding excessive acoustic impedance caused by an insufficiently large sound outlet opening area), the width of the sound outlet opening 112 should not be too small. Therefore, the ratio of the distance between the center O of the sound outlet opening 112 and the upper apex M of the ear hook 12 to the distance between the center O of the sound outlet opening 112 and the underside IS of the sound-generating part 11 should not be too small.In some embodiments, it is provided that in the user-worn open-ear headphones 10, the ratio of the distance between the center O of the sound outlet opening 112 and the upper apex M of the ear hook 12 to the distance between the center O of the sound outlet opening 112 and the underside IS of the sound generating part 11 is between 4.50 and 6.76.

[0097] Fig. Figure 15 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 description.

[0098] Combined with Fig. 13 and Fig. In some embodiments, 15 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 Fig. The chamber structure shown in Figure 9 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 headphones 10.

[0099] 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 13, 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.

[0100] 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.

[0101] As in Fig. As shown in Figure 15, 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.

[0102] As in Fig. As shown in Figure 15, 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. Since the sound from the pressure relief opening 113 can be transmitted into the chamber structure via the leakage structure (for example, the first leakage structure UC or the second leakage structure LC) and thus cancel each other out with the sound from the sound outlet opening 112, the pressure relief opening 113 should not be located too close to the leakage structure in some embodiments.Provided that the sound-generating element 11 is at least partially inserted into the cavum conchae, the distance from the pressure relief opening 113 to the sound outlet opening 112 is also limited by the dimensions of the sound-generating element 11. Therefore, to achieve a high audibility index for the open-ear headphones 10 across the entire frequency range, the pressure relief opening 113 should be positioned as far away as possible from the sound outlet opening 112. For example, the pressure relief opening 113 is located on the upper surface US of the sound-generating element 11.In this case, the ratio of the distance between the projection point O' of the center O of the sound outlet opening 112 onto the sagittal plane and the projection point A of the center of the upper boundary of the inner side IS onto the sagittal plane to the distance between the projection point O' of the center O of the sound outlet opening 112 onto the sagittal plane and the projection point of the center of the pressure relief opening 113 onto the sagittal plane is from 0.7 to 1.3.

[0103] If the relative position between the sound outlet 112 and the pressure relief vent 113 remains unchanged (i.e., if the distance between the sound outlet 112 and the pressure relief vent 113 remains unchanged), the overall audibility index of the open-ear headphone 10 (across the entire 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, thereby significantly reducing the audibility index near this resonant frequency.

[0104] The greater the distance from the projection point O' of the center O of the sound outlet opening 112 onto the sagittal plane to the projection point A of the center point of the upper boundary of the inner surface IS onto the sagittal plane, the larger the volume V of the chamber structure. Provided that the sound-generating element 11 is at least partially inserted into the cavum conchae, some embodiments therefore provide that the distance from the projection point O' of the center O of the sound outlet opening 112 onto the sagittal plane to the projection point A of the center point of the upper boundary of the inner surface IS onto the sagittal plane is in the range of 10.0 mm to 15.2 mm, so that the sound outlet opening 112 can be positioned near the ear canal and the chamber structure has a suitable volume V, thus enabling better sound reception quality in the ear canal.In some embodiments, the distance from the projection point O' of the center O of the sound outlet opening 112 onto the sagittal plane to the projection point A of the center point of the upper boundary of the inner surface IS onto the sagittal plane is in the range of 11.0 mm to 14.2 mm. In some embodiments, the distance from the projection point O' of the center O of the sound outlet opening 112 onto the sagittal plane to the projection point A of the center point of the upper boundary of the inner surface IS onto the sagittal plane is in the range of 12.0 mm to 14.7 mm. In some embodiments, the distance from the projection point O' of the center O of the sound outlet opening 112 onto the sagittal plane to the projection point A of the center point of the upper boundary of the inner surface IS onto the sagittal plane is in the range of 12.5 mm to 14.2 mm.In some embodiments, the distance from the projection point O' of the center O of the sound outlet opening 112 onto the sagittal plane to the projection point A of the center of the upper boundary of the inner side IS onto the sagittal plane is in the range of 13.0 mm to 13.7 mm.

[0105] Since the tragus is located near the ear canal opening and the sound outlet 112 is therefore easily obscured by the tragus, in some embodiments the distance from the projection point O' of the center O of the sound outlet 112 onto the sagittal plane to the projection point B of the center of the ear canal opening onto the sagittal plane is in the range of 2.2 mm to 3.8 mm, so that the sound outlet 112 is located as close as possible to the ear canal and is thus not obscured. In some embodiments the distance from the projection point O' of the center O of the sound outlet 112 onto the sagittal plane to the projection point B of the center of the ear canal opening onto the sagittal plane is in the range of 2.4 mm to 3.6 mm.In some embodiments, the distance from the projection point O' of the center O of the sound outlet opening 112 onto the sagittal plane to the projection point B of the center of the ear canal opening onto the sagittal plane is in the range of 2.6 mm to 3.4 mm. In some embodiments, the distance from the projection point O' of the center O of the sound outlet opening 112 onto the sagittal plane to the projection point B of the center of the ear canal opening onto the sagittal plane is in the range of 2.8 mm to 3.2 mm.

[0106] In some embodiments, the distance from projection point A of the center of the upper boundary of the inner surface IS onto the sagittal plane to projection point B of the center 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 a suitable gap exists between the upper boundary of the inner surface IS and the cavum conchae (to form a leakage structure of the chamber structure). In some embodiments, the distance from projection point A of the center of the upper boundary of the inner surface IS onto the sagittal plane to projection point B of the center of the ear canal opening onto the sagittal plane is in the range of 13 mm to 17 mm.In some embodiments, the distance from projection point A of the center of the upper boundary of the inner surface IS onto the sagittal plane to projection point B of the center of the ear canal opening onto the sagittal plane is in the range of 14 mm to 16 mm. In some embodiments, the distance from projection point A of the center of the upper boundary of the inner surface IS onto the sagittal plane to projection point B of the center of the ear canal opening onto the sagittal plane is in the range of 14.5 mm to 15.5 mm.

[0107] In some embodiments, the distance from projection point C of the point at the third of the lower boundary of the inner surface IS onto the sagittal plane to projection point B of the center of the ear canal opening onto the sagittal plane is in the range of 1.7 mm to 2.7 mm to ensure that the sound-generating part 11 projects into the cavum conchae and that a suitable gap exists between the lower boundary of the inner surface IS and the cavum conchae (to form the leakage structure of the chamber structure). In some embodiments, the distance from projection point C of the point at the third of the lower boundary of the inner surface IS onto the sagittal plane to projection point B of the center of the ear canal opening onto the sagittal plane is in the range of 1.8 mm to 2.6 mm.In some embodiments, the distance from projection point C of the point at the third of the lower boundary of the inner surface IS onto the sagittal plane to projection point B at the center of the ear canal opening onto the sagittal plane is in the range of 1.9 mm to 2.5 mm. In some embodiments, the distance from projection point C of the point at the third of the lower boundary of the inner surface IS onto the sagittal plane to projection point B at the center of the ear canal opening onto the sagittal plane is in the range of 2.0 mm to 2.4 mm. In some embodiments, the distance from projection point C of the point at the third of the lower boundary of the inner surface IS onto the sagittal plane to projection point B at the center of the ear canal opening onto the sagittal plane is in the range of 2.1 mm to 2.3 mm.

[0108] In some embodiments, the volume V of the chamber structure is larger the greater the distance from the projection point O' of the center O of the sound outlet opening 112 onto the sagittal plane to the projection point C of the point at the third of the lower boundary of the inner surface IS onto the sagittal plane. Provided that the sound-generating part 11 is at least partially inserted into the cavum conchae, improved sound reception quality in the ear canal is achieved by positioning the sound outlet opening 112 near the ear canal and by having a chamber structure with a suitable volume V. In some embodiments, the distance from the projection point O' of the center O of the sound outlet opening 112 onto the sagittal plane to the projection point C of the point at the third of the lower boundary of the inner surface IS onto the sagittal plane is in the range of 3.5 mm to 5.6 mm.In some embodiments, the distance from the projection point O' of the center O of the sound outlet opening 112 onto the sagittal plane to the projection point C of the point at the third of the lower boundary of the inner surface IS onto the sagittal plane is in the range of 3.9 mm to 5.2 mm. In some embodiments, the distance from the projection point O' of the center O of the sound outlet opening 112 onto the sagittal plane to the projection point C of the point at the third of the lower boundary of the inner surface IS onto the sagittal plane is in the range of 4.3 mm to 4.8 mm. In some embodiments, the distance from the projection point O' of the center O of the sound outlet opening 112 onto the sagittal plane to the projection point C of the point at the third of the lower boundary of the inner surface IS onto the sagittal plane is in the range of 4.5 mm to 4.6 mm.

[0109] Fig. Figure 16A shows an exemplary representation of an internal structure of a sound-generating part according to some embodiments of the present description.

[0110] As in Fig. As shown in Figure 16A, the sound-generating part 11 can 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 board 13, enabling the transducer 116 to be powered by the battery under the control of the main control board 13. Alternatively, the battery and the transducer 116 can be located 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.

[0111] 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.

[0112] Due to the volume and depth of the concha, a certain distance can exist 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 outlet 112 being at least partially located within this chamber structure. Thus, when worn, the sound wave propagating through the sound outlet 112 is limited by this 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 opening 113 provided in the sound generation part 11 generally creates a second sound loss in the far field, wherein the strength of the first sound loss above is comparable to the strength 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.

[0113] In some embodiments, the sound-generating part 11 primarily comprises the housing 111 in conjunction with the ear hook 12 and the transducer 116 arranged within the housing 111. The sound outlet opening 112 is provided on the inner surface IS of the housing 111, which, when worn, faces the ear. The sound wave generated by the transducer 116 propagates out of the sound outlet opening 112 to facilitate transmission into the external ear canal 101. It should be noted that the sound outlet opening 112 can be located either on the underside LS of the housing 111 or at a corner between the inner surface IS and the underside LS.

[0114] 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.

[0115] 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 16A, 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.

[0116] 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 f1 of the front chamber 114 cannot be lower than 6 kHz. In some embodiments, the resonant frequency f1 of the front chamber 114 cannot be lower than 7 kHz. In some embodiments, the resonant frequency f1 of the front chamber 114 cannot be lower than 8 kHz.

[0117] In some embodiments, the front chamber 114 and the sound outlet 112 can be considered, for example, as a model of a Helmholtz resonator, wherein the front chamber 114 corresponds to the chamber of the model Helmholtz resonator and the sound outlet 112 to its neck. In this case, the resonance of the model Helmholtz resonator corresponds to the resonance frequency f1 of the front chamber 114. In the model Helmholtz resonator, the dimension of the neck (e.g., of the sound outlet 112) can influence the resonance frequency f of the chamber, the specific relationship being described by the following formula (2): f=c2πsVL,

[0118] where c represents the speed of sound, S represents the cross-sectional area of ​​the throat (e.g., the sound outlet opening 112), V represents the volume of the chamber (e.g., the front chamber 114), and L represents the depth of the throat (e.g., the sound outlet opening 112).

[0119] Formula (2) shows that the resonance frequency f1 of the front chamber 114 increases and shifts to higher frequencies when the cross-sectional area S of the sound outlet opening 112 is increased and the depth L of the sound outlet opening 112 is decreased.

[0120] In some embodiments, the entire air volume at the sound outlet 112 forms an acoustic mass that can resonate with the system (for example, a Helmholtz resonator) to generate a low-frequency emission. Therefore, a smaller acoustic mass can impair the low-frequency emission of the Helmholtz resonator model. The dimensions of the sound outlet 112 can also influence the acoustic mass Ma of the sound outlet 112, the specific relationship being described by the following formula (3): Ma=ρLS,

[0121] where ρ represents air density, S represents cross-sectional area of ​​the sound outlet opening 112 and L represents the depth of the sound outlet opening 112.

[0122] Formula (3) shows that the cross-sectional area S of the sound outlet opening 112 is increased, its depth L is reduced, and the acoustic mass Ma of the sound outlet opening 112 is reduced.

[0123] In conjunction with formula (2) and formula (3), it can be seen that the larger the ratio S / L of the cross-sectional area S to the depth L of the sound outlet opening 112, the higher the resonance frequency f1 of the front chamber 114 and the smaller the acoustic mass Ma of the sound outlet opening 112. The ratio S / L of the cross-sectional area S to the depth L of the sound outlet opening 112 must therefore lie within a suitable range of values, the details of which are given, for example, in Fig. 17A, Fig. 17B and Fig. 18B can be seen.

[0124] Fig. Figure 16B shows an exemplary representation of an internal structure of a converter according to some embodiments of the present description.

[0125] As in Fig. As shown in Figure 16B, the transducer 116 is housed in the casing 111. The transducer 116 comprises a diaphragm 1141, a voice coil 1142, a basket 1143, and a magnetic circuit assembly 1144. The basket 1143 is arranged to surround the diaphragm 1141, the voice coil 1142, and the magnetic circuit assembly 1144, providing a mounting and fastening platform. The transducer 116 can be connected to the casing 111 via the basket 1143. The diaphragm 1141 covers the voice coil 1142 and the magnetic circuit assembly 1144 in the Z-direction. The voice coil 1142 projects into the magnetic circuit assembly 1144 and is then connected to the diaphragm 1141. A magnetic field generated by the current flowing through the voice coil 1142 interacts with the magnetic field formed by the magnetic circuit arrangement 1144.This causes the membrane 1141 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.

[0126] In some embodiments, the magnetic circuit arrangement 1144 comprises a magnetically conductive plate 11441, a magnet 11442, and a receiving element 11443. The magnetically conductive plate 11441 and the magnet 11442 are connected to each other. A side of the magnet 11442 facing away from the magnetically conductive plate 11441 is attached to a bottom wall of the receiving element 11443, and a gap exists between the circumferential side of the magnet 11442 and the inner wall of the circumferential side of the receiving element 11443. In some embodiments, the outer wall of the circumferential side of the receiving element 11443 is connected to and fastened to the basket 1143. In some embodiments, the receiving element 11443 and the magnetically conductive plate 11441 can both be made of a magnetically conductive material (for example, iron).

[0127] In some embodiments, the circumferential side of the membrane 1141 can be connected to the basket 1143 via a retaining ring 1145. In some embodiments, the material of the retaining ring 1145 can be stainless steel or another metal to adapt it to the manufacturing process of the membrane 1141.

[0128] With reference to Fig. 16A and Fig. In some embodiments, 16B provides that the projection area of ​​the diaphragm 1141 in the Z-direction should be as large as possible to improve the effect of the acoustic output (especially the low-frequency output) of the sound-generating part 11 and the ability of the diaphragm 1141 to drive the air. However, an excessively large area of ​​the diaphragm 1141 leads to an excessively large transducer 116 and thus to an excessively large housing 111. This can easily lead to contact and friction between the housing 111 and the ear, which impairs the wearing comfort of the sound-generating part 11. Therefore, the housing 111 must be dimensioned accordingly. For example, the dimension of the concha in the Y-direction (e.g., 17 mm) can determine the width dimension of the housing 111 in the Y-direction. Then, based on wearing comfort, a suitable length-to-width ratio (i.e.,The ratio of the dimension of the housing 111 in the Y-direction to its dimension in the X-direction is selected. Thus, the length dimension of the housing 111 in the X-direction (for example, 21.49 mm) is determined such that it corresponds to the dimension of the caveum conchae in the Y-direction.

[0129] In some embodiments, the dimensions of the housing 111 can be selected within a predetermined range so that, for most users wearing the open-ear headphones 10, the sound-generating element 11 can be at least partially inserted into the concha, forming a chamber structure with improved acoustic performance. This is achieved, for example, by creating a first leakage structure UC and a second leakage structure LC between the open-ear headphones 10 and the user's ear, thus enhancing 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 other 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 13 mm and 14 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 between 5 mm and 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 inner surface IS of the housing 111 can be between 90 mm². 2 and 560 mm 2The 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 an approximation of the projection area of ​​the membrane 1141 in the Z-direction. For example, there is a 10% difference between the area of ​​the inner surface IS and the projection area of ​​the membrane 1141 in the Z-direction. 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. 9 to Fig. The 12 described principles are carried out as described in Fig. Figure 13 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.

[0130] With reference to Fig. 16A and Fig. In some embodiments, the distance from the center O of the sound outlet opening 112 in the Z-direction to the base of the magnetic circuit assembly 1144 can be related to the vibration range of the diaphragm 1141 and the thickness of the magnetic circuit assembly 1144. The vibration range of the diaphragm 1141 can influence the amount of air driven by the transducer of the sound-generating part 11. The larger the vibration range of the diaphragm 1141, the greater the amount of air driven by the transducer of the sound-generating part 11 and the higher the sound-generating power of the sound-generating part. The thicker the magnetic circuit assembly 1144, the greater the overall weight of the sound-generating part 11, which impairs the user's wearing comfort.Furthermore, if the thickness of the sound-generating element in the Z-direction is determined, the volume of the rear chamber can be larger the smaller the distance from the center O of the sound outlet opening 112 to the base of the magnetic circuit arrangement 1144 in the Z-direction. In this case, it can be seen from the above formula (2) that the lower the resonance frequency of the rear chamber, the more the resonance peak of the rear chamber shifts to lower frequencies and the smaller the flat region of the frequency response curve becomes.To ensure sufficiently high sound generation power of the sound-generating element, a resonance frequency of the rear chamber within the appropriate frequency range (e.g., 1000 Hz to 5000 Hz), and adequate wearing comfort for the user, it is therefore provided that, taking into full consideration the structural strength, the difficulty of the technical implementation, and the overall thickness of the housing 111, the distance l1 from the center O of the sound outlet opening 112 in the Z-direction to the base surface of the magnetic circuit arrangement 1144 (i.e., the side of the receiving element 11443 that is furthest from the sound outlet opening 112 in the Z-direction) is in the range of 5.65 mm to 8.35 mm. In some embodiments, it is provided that the distance l1 from the center of the sound outlet opening 112 in the Z-direction to the base surface of the magnetic circuit arrangement 1144 is in the range of 6.00 mm to 8.00 mm.In some embodiments, the distance l1 from the center of the sound outlet opening 112 in the Z-direction to the base of the magnetic circuit arrangement 1144 is in the range of 6.35 mm to 7.65 mm. In some embodiments, the distance l1 from the center of the sound outlet opening 112 in the Z-direction to the base of the magnetic circuit arrangement 1144 is in the range of 6.70 mm to 7.30 mm. In some embodiments, the distance l1 from the center of the sound outlet opening 112 in the Z-direction to the base of the magnetic circuit arrangement 1144 is in the range of 6.95 mm to 7.05 mm.

[0131] In some embodiments, the distance between the center O of the sound outlet opening 112 and a median plane of the long axis of the magnetic circuit arrangement 1144, such as one in Fig. The plane NN' shown in Figure 13, which is oriented inwards perpendicular to the drawing plane, lies in the range of 1.45 mm to 2.15 mm. In this description, the median plane of the long axis of the magnetic circuit assembly 1144 refers to a plane that runs parallel to the underside LS of the sound-generating part 11 and passes through the geometric center of the magnetic circuit assembly 1144. That is, the median plane of the long axis of the magnetic circuit assembly 1144 allows this magnetic circuit assembly 1144 to be divided into two equal parts in the X direction. The distance between the center O of the sound outlet opening 112 and the median plane of the long axis of the magnetic circuit assembly 1144 also corresponds to the distance from the center O of the sound outlet opening 112 in the Y direction of the short axis to the median plane of the long axis.In some embodiments, the distance between the center O of the sound outlet opening 112 and the median plane of the long axis is in the range of 1.55 mm to 2.05 mm. In some embodiments, the distance between the center O of the sound outlet opening 112 and the median plane of the long axis is in the range of 1.65 mm to 1.95 mm. In some embodiments, the distance between the center O of the sound outlet opening 112 and the median plane of the long axis is in the range of 1.75 mm to 1.85 mm.

[0132] Fig. Figure 17A shows a diagram of frequency response curves of an open-ear headphone corresponding to the sound outlet openings with different cross-sectional areas at a specific aspect ratio according to some embodiments of the present description. Fig. Figure 17A shows the frequency response curve corresponding to the open-ear headphone 10, which has a sound outlet opening with a cross-sectional area of ​​approximately 0.44 mm². 2 up to 100.43 mm 2 exhibits, whereby other structures (for example, the pressure relief opening 113, the volume of the rear chamber, etc.) are defined and the aspect ratio of the sound outlet opening is determined. It is made of Fig. As can be seen in Figure 17A, under the foregoing conditions, the resonance frequency f1 (i.e., the frequency corresponding to the resonance peak in the dashed circle G), which corresponds to the front chamber in the frequency response curve of the open-ear headphone 10, gradually shifts to higher frequencies as the cross-sectional area S of the sound outlet 112 increases, while the resonance frequency corresponding to the rear chamber remains constant at approximately 4.5 kHz. In particular, the resonance peak of the front chamber gradually shifts to higher frequencies as the cross-sectional area S of the sound outlet 112 increases. At a shift to approximately 4.5 kHz, the resonance frequencies of the front and rear chambers are essentially the same, with the peak value of the resonance remaining essentially unchanged.After the resonance peak of the front chamber has shifted to 4.5 kHz, the peak value of the resonance peak of the front chamber tends to decrease significantly with further enlargement of the cross-sectional area S of the sound outlet opening 112. In some embodiments, the cross-sectional area S of the sound outlet opening 112 can be larger than 2.87 mm². 2 to achieve a wide, flat frequency response curve for the open-ear headphones 10. Preferably, the cross-sectional area S of the sound outlet opening 112 can be larger than 4.0 mm². 2 to keep the frequency response curve of the open-ear headphones 10 relatively flat in the range from 100 Hz to 2.3 kHz. Preferably, the cross-sectional area S of the sound outlet opening 112 can be larger than 7.0 mm². 2 to keep the frequency response curve of the Open-Ear Headphones 10 relatively flat in the range from 100 Hz to 3.3 kHz.

[0133] Furthermore, it is provided that within a certain range of the cross-sectional area S of the sound outlet opening 112, the resonance peak of the front chamber shifts to higher frequencies as the cross-sectional area S of the sound outlet opening 112 increases, while its peak value gradually decreases. Therefore, in order to improve the sound quality of the open-ear headphones 10 and simultaneously facilitate EQ adjustment, the frequency response of the open-ear headphones 10 must, in some embodiments, be sufficient in the high-frequency range (for example, from 4.5 kHz to 9 kHz) so that the cross-sectional area S of the sound outlet opening 112 is less than 54 mm². 2 The cross-sectional area S of the sound outlet opening 112 can preferably be less than 36.15 mm². 2to achieve a sufficient frequency response curve for the open-ear headphones 10 in the range of 4.5 kHz to 8 kHz. Preferably, the cross-sectional area S of the sound outlet opening 112 can be smaller than 21.87 mm². 2 to achieve a sufficient frequency response curve of the open-ear headphones 10 in the range of 4.5 kHz to 6.5 kHz. For the sake of simplicity in the present description, the cross-sectional area S of the sound outlet opening 112 can refer to an area of ​​the outer opening of the sound outlet opening 112 (i.e., an opening area on the inside of the sound outlet opening 112). It should be noted that in some embodiments, the cross-sectional area S of the sound outlet opening 112 can also be the area of ​​the inner openings of the sound outlet opening 112 or an average of the areas of the inner and outer openings of the sound outlet opening 113.

[0134] Fig. Figure 17B shows a diagram of frequency response curves of a front chamber corresponding to the sound outlet openings, each with different cross-sectional areas, according to some embodiments described in this document. As in Fig. As shown in Figure 17B, the cross-sectional area S of the sound outlet opening 112 decreases from 2.875 mm² when increased. 2 to 46.10 mm 2 the acoustic mass M a the sound outlet opening 112 of 800 kg / m 4 per 50 kg / m 4 , and the resonant frequency f1 of the front chamber gradually increases from about 4 kHz to about 8 kHz. It should be noted that the in Fig. Parameters specified in 17B, such as 200 kg / m² 4 and 800 kg / m² 4 only represent the theoretical acoustic mass of the sound outlet opening 112, which may differ from the actual acoustic mass of the sound outlet opening 112.

[0135] To improve the acoustic output of the open-ear headphones 10 and simultaneously increase the resonance frequency f1 of the front chamber, a sufficiently large acoustic mass M a To ensure the proper functioning of the sound outlet 112, the cross-sectional area S of the sound outlet 112 must be within a suitable range. Furthermore, an excessively large cross-sectional area of ​​the sound outlet 112 could, in an actual embodiment, have certain effects on the appearance, structural strength, water and dust resistance, and other aspects of the open-ear headphones 10. In some embodiments, the cross-sectional area S of the sound outlet 112 can be within the range of 2.87 mm². 2 up to 46.10 mm 2 In some embodiments, the cross-sectional area S of the sound outlet opening 112 can be in the range of 2.875 mm². 2 up to 46 mm 2In some embodiments, the cross-sectional area S of the sound outlet opening 112 can be in the range of 10 mm². 2 up to 30 mm 2 In some embodiments, the cross-sectional area S of the sound outlet opening can be 112 25.29 mm². 2 In some embodiments, the cross-sectional area S of the sound outlet opening 112 can be in the range of 25 mm². 2 up to 26 mm 2 lay.

[0136] In some embodiments, the area of ​​the inner surface IS of the sound-generating element 11 must be adapted to the dimensions of the concha of the human body to increase stability when wearing the open-ear headphones 10. Furthermore, when the sound-generating element 11 is worn by being inserted into the concha, the chamber structure formed by the inner surface IS and the flank of the concha provides higher sound generation compared to conventional wearing methods (e.g., when the sound-generating element 11 is placed in front of the tragus). In this case, the entire sound-generating element can be made smaller, allowing for a larger ratio between the area of ​​the sound outlet opening 112 and the area of ​​the inner surface IS.At the same time, the area of ​​the sound outlet opening should not be too large, otherwise this would impair the stability of the water- and dust-tight structure and the support structure at the sound outlet opening. The area of ​​the inner surface IS should also not be too small, otherwise this would impair the area over which the air can be driven by the transducer. In some embodiments, the ratio of the cross-sectional area S of the sound outlet opening 112 to the area of ​​the inner surface IS can be between 0.015 and 0.25. In some embodiments, the ratio of the cross-sectional area S of the sound outlet opening 112 to the area of ​​the inner surface IS can be between 0.02 and 0.2. In some embodiments, the ratio of the cross-sectional area S of the sound outlet opening 112 to the area of ​​the inner surface IS can be between 0.06 and 0.16.In some embodiments, the ratio of the cross-sectional area S of the sound outlet opening 112 to the area of ​​the inside IS can be between 0.1 and 0.12.

[0137] Considering that the inner surface IS may be in contact with the ear (e.g., the concha), some embodiments provide for the inner surface IS to have a non-planar structure to improve wearing comfort. For example, the edge region of the inner surface IS has a certain curvature compared to the central region. Alternatively, a protruding structure is provided in the area of ​​the inner surface IS near the free end FE to better conform to the ear area.To better reflect the influence of the cross-sectional area of ​​the sound outlet 112 on the stability for wearing and the sound generation performance of the open-ear headphones 10, the ratio between the cross-sectional area S of the sound outlet 112 and the area of ​​the inner surface IS can be determined in this case by the ratio of the cross-sectional area S of the sound outlet 112 to the projection area of ​​the inner surface IS in the direction of vibration of the diaphragm (i.e. in the direction shown). Fig. (Z-direction shown in Figure 16A). In some embodiments, the ratio of the cross-sectional area S of the sound outlet opening 112 to the projection area of ​​the inner surface IS in the direction of vibration of the diaphragm can be between 0.016 and 0.255. Preferably, the ratio of the cross-sectional area S of the sound outlet opening 112 to the projection area of ​​the inner surface IS in the direction of vibration of the diaphragm can be between 0.022 and 0.21.

[0138] In some embodiments, the projection area of ​​the transducer's diaphragm in its direction of vibration can be equal to or slightly smaller than the projection area of ​​the inner surface IS in the same direction of vibration. In this case, the ratio of the cross-sectional area S of the sound outlet opening 112 to the projection area of ​​the diaphragm in its direction of vibration can be between 0.016 and 0.261. Preferably, the ratio of the cross-sectional area S of the sound outlet opening 112 to the projection area of ​​the inner surface IS in the same direction of vibration can be between 0.023 and 0.23.

[0139] In some embodiments, the shape of the sound outlet opening 112 could also affect its acoustic resistance. The narrower the sound outlet opening 112, the greater its acoustic resistance, which negatively impacts the acoustic output of the front chamber 114. To ensure adequate acoustic resistance of the sound outlet opening 112, the ratio of the long axis dimension to the short axis dimension of the sound outlet opening 112, also called the aspect ratio of the sound outlet opening 112, must lie within a predetermined, suitable range.

[0140] The shape of the sound outlet opening 112 can, in some embodiments, be circular, oval, track-shaped, or another shape, without being limited to such. For the sake of simplicity, an exemplary description is given below using the example of a sound outlet opening 112 with a track shape. As in Fig. As shown in Figure 14, the sound outlet opening 112 can, in some embodiments, have a track shape, wherein the two ends of the track shape can be formed in the form of a secondary arc or a semicircle. The dimension of the long axis of the sound outlet opening 112 can be the maximum dimension of the sound outlet opening 112 in the X-direction (the dimension d of the long axis, as shown in Figure 14). Fig. 14). Likewise, the dimension of the short axis of the sound outlet opening 112 can refer to the maximum dimension of the sound outlet opening 112 in the Y-direction (the dimension h of the short axis, as shown in Fig. 14 shown).

[0141] Fig. Figure 18A shows a diagram of frequency response curves of an open-ear headphone corresponding to the sound outlet openings at different aspect ratios according to some embodiments of the present description. Fig. Figure 18A shows the frequency response curve according to the open-ear headphone, each having a sound outlet opening with an aspect ratio of 1, 3, 5, 8, or 10, where other structures (for example, the pressure relief opening 113, the volume of the rear chamber, etc.) are specified and the area of ​​the respective sound outlet opening is determined.

[0142] It's out Fig. As can be seen in Figure 18A, for a given cross-sectional area of ​​the sound outlet 112, the resonance frequency f1 of the resonance peak of the front chamber 114 gradually shifts to higher frequencies as the aspect ratio of the sound outlet 112 increases, while the intensity of the resonance peak gradually decreases. For a given cross-sectional area of ​​the sound outlet 112, the ratio of the dimension of the long axis of the sound outlet 112 to the dimension of the short axis of the sound outlet 112 can therefore be in the range of 1 to 10 to ensure a sufficiently high intensity of the resonance peak of the front chamber. In some embodiments, the ratio of the dimension of the long axis of the sound outlet 112 to the dimension of the short axis of the sound outlet 112 can be in the range of 2 to 8.The ratio of the dimension of the long axis of the sound outlet opening 112 to the dimension of the short axis of the sound outlet opening 112 can also be in the range of 2 to 4. In some embodiments, the dimension of the long axis of the sound outlet opening 112 can be 7.67 mm and that of the short axis of the sound outlet opening 112 can be 3.62 mm.

[0143] Fig. Figure 18B shows a diagram of frequency response curves of a front chamber corresponding to the sound outlet openings, each with different depths, according to some embodiments described in this document. As in Fig. As shown in Figure 18B, increasing the depth L of the sound outlet opening 112 from 0.3 mm to 3 mm reduces the acoustic mass Ma of the sound outlet opening 112 from 100 kg / m4 to 1000 kg / m 4 and the resonance frequency f1 of the front chamber decreases from about 7 kHz to about 3.7 kHz.

[0144] To ensure that the front chamber has a sufficiently high resonant frequency, the depth L of the sound outlet opening 112, as determined by formula (2), should be as small as possible. However, since the sound outlet opening 112 is located within the housing 111, its depth corresponds to the thickness of the housing 111's side wall. If the housing 111 is too thin, the structural integrity of the open-ear headphones 10 could be compromised. Furthermore, the corresponding machining technique is relatively difficult. In some embodiments, the depth L of the sound outlet opening 112 can range from 0.3 mm to 3 mm. In some embodiments, the depth L of the sound outlet opening 112 can range from 0.3 mm to 2 mm. In some embodiments, the depth L of the sound outlet opening 112 can be 0.3 mm.In some embodiments, it is provided that the depth L of the sound outlet opening 112 can also be 0.6 mm.

[0145] In some embodiments, according to formula (2), the resonance frequency of the front chamber is higher and the effect of the sound emitted from the sound outlet opening in the mid and low frequency range is better the larger the square ratio S / L. 2 The cross-sectional area S to the depth L of the sound outlet opening 112 is given, provided the volume of the front chamber is not easily variable. However, the cross-sectional area S of the sound outlet opening 112 should not be too large, and the depth L (the thickness of the housing 111) should likewise not be too small. In some embodiments, therefore, the square ratio S / L is provided. 2The ratio of the cross-sectional area S to the depth L of the sound outlet opening 112 can be in the range of 0.31 to 512.2. In some embodiments, the square ratio S / L is provided for. 2 The ratio of the cross-sectional area S to the depth L of the sound outlet opening 112 can be in the range of 1 to 400. In some embodiments, the square ratio S / L is provided for. 2 The ratio of the cross-sectional area S to the depth L of the sound outlet opening 112 can be in the range of 3 to 300. In some embodiments, the square ratio S / L is provided for. 2 The ratio of the cross-sectional area S to the depth L of the sound outlet opening 112 can be in the range of 5 to 200. In some embodiments, the square ratio S / L is provided for. 2 The cross-sectional area S to the depth L of the sound outlet opening 112 can be in the range of 10 to 50.

[0146] 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] PCT / CN2022 / 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 hangs between the auricle and the head of a user, and wherein a second part of the ear hook extends towards a side of the auricle facing away from the head and is connected to the sound-generating part in order to secure the sound-generating part at a location where the sound-generating part is near the ear canal without blocking the ear canal, the transducer includes a diaphragm, a sound outlet opening is provided on one of the inner sides of the housing facing the ear, which is used to direct sound generated by the vibration of the diaphragm out of the housing and then transmit it to the ear canal, and The ratio of the area of ​​the sound exit opening to the projection area of ​​the membrane in its direction of vibration is in the range of 0.016 to 0.

261. [2] Open-ear headphones according to claim 1, wherein the sound-generating part comprises a connecting end that is 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, such that a certain distance exists between the inside of the sound-generating part and the caveum conchae, and an auxiliary chamber is formed. [3] Open-ear headphones according to claim 1 or claim 2, wherein, in the worn state, the sound-generating part and the ear hook each clamp the ear area corresponding to the cavum conchae from the front and back of the ear. [4] Open-ear headphones according to one of claims 1 to 3, wherein the ratio of the cross-sectional area of ​​the sound outlet opening to the projection area of ​​the diaphragm in its direction of vibration is in the range of 0.023 to 0.

23. [5] Open-ear headphones according to any one of claims 1 to 4, wherein the sound outlet opening has a cross-sectional area of ​​2.87 mm² 2 up to 46.10 mm 2 exhibits, and wherein the projection area of ​​the membrane in its direction of vibration is 150 mm 2 up to 230 mm 2 amounts. [6] Open-ear headphones according to any one of claims 1 to 5, wherein the distance between the center of the sound outlet opening and the underside of the sound generating part is in the range of 4.05 mm to 6.05 mm. [7] Open-ear headphones according to any one of claims 1 to 6, wherein the distance between the center of the sound outlet opening and a rear side of the sound generating part is in the range of 8.15 mm to 12.25 mm. [8] Open-ear headphones according to any one of claims 1 to 7, wherein the distance from a projection point of the center of the sound outlet opening onto the sagittal plane to a projection point of the center of the ear canal opening of the ear canal onto the sagittal plane is in the range of 2.2 mm to 3.8 mm. [9] Open-ear headphones according to any one of claims 1 to 8, wherein the distance from a projection point of the center of the sound outlet opening onto the sagittal plane to a projection point of a center of the upper boundary of the inside of the sound generating part onto the sagittal plane is in the range of 10.0 mm to 15.2 mm. [10] Open-ear headphones according to claim 9, wherein the distance from the projection point of the center of the upper boundary of the inside of the sound-generating part onto the sagittal plane to the projection point of the center of the ear canal opening onto the sagittal plane is in the range of 12 mm to 18 mm. [11] Open-ear headphones according to any one of claims 1 to 10, wherein the transducer comprises a basket and a magnetic circuit arrangement, the basket is arranged in such a way that it surrounds the magnetic circuit arrangement, the distance between the center of the sound outlet opening and a median plane of a long axis of the magnetic circuit arrangement is in the range of 1.45 mm to 2.15 mm, wherein the median plane of the long axis of the magnetic circuit arrangement refers to a plane that runs parallel to the underside of the sound-generating part and passes through the geometric center of the magnetic circuit arrangement. [12] Open-ear headphones according to any one of claims 1 to 11, wherein the ratio of the dimension of the long axis of the sound outlet opening to the dimension of the short axis of the sound outlet opening is in the range of 2 to 8. [13] Open-ear headphones according to any one of claims 1 to 12, wherein the open-ear headphones include an adjustment mechanism for connecting the sound-generating part to the ear hook, wherein the adjustment mechanism is designed so that, in the worn state, the relative position of the sound-generating part on the ear is adjusted by the adjustment mechanism, so that the sound-generating part together with the cavum conchae forms an auxiliary chamber.

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