Acoustic output device

Abstract

Acoustic output device, characterized in that it comprises: a housing in which an inner chamber is formed; a support structure that allows the housing to be held in a position on the ear without blocking the external ear canal; a first loudspeaker which is accommodated in the inner chamber, the first loudspeaker comprising a first magnet and a first diaphragm which are spaced apart from each other in a direction of vibration of the first diaphragm; and a second loudspeaker which is incorporated in the inner cannon, the second loudspeaker comprising a second magnet and a second diaphragm spaced apart from each other in a direction of vibration of the second diaphragm; wherein the first magnet and the second magnet are spaced apart from each other in the direction of oscillation of the first membrane, and wherein the first magnet and the second magnet have the same magnetic poles which are arranged opposite each other.

Description

Technical field

[0001] The present description concerns the technical field of acoustics, in particular an acoustic output device. State of the art

[0002] Open-back headphones are portable audio devices that enable directional sound transmission. Compared to traditional in-ear and over-ear headphones, open-back headphones are distinguished by the fact that they do not block or cover the ear canal. This allows users to perceive acoustic information from their surroundings while listening to music, increasing safety and comfort. The speaker design is crucial for ensuring the sound output of open-back headphones. To maximize the sound output effect, the speakers of open-back headphones must be specifically designed to meet the sound pressure requirements of open-back headphones across specific frequency bands. Disclosure of the invention

[0003] The embodiments described herein provide an acoustic output device comprising: a housing in which an inner chamber is formed; a support structure by which the housing is carried at a position of the ear without blocking the external auditory canal; a first loudspeaker which is received in the inner chamber, wherein the first loudspeaker comprises a first magnet and a first diaphragm which are spaced apart from each other in a direction of vibration of the first diaphragm;and a second loudspeaker which is accommodated in the inner chamber, wherein the second loudspeaker comprises a second magnet and a second diaphragm which are spaced apart from each other in a direction of oscillation of the second diaphragm, wherein the first magnet and the second magnet are spaced apart from each other in the direction of oscillation of the first diaphragm, and wherein the first magnet and the second magnet have like magnetic poles which are arranged opposite each other.

[0004] In some embodiments, it is provided that the sound emitted by the first loudspeaker has at least a partially lower frequency than the sound emitted by the second loudspeaker.

[0005] In some embodiments, the axis of the first magnet is arranged parallel to and spaced apart from the axis of the second magnet.

[0006] In some embodiments, a first sound outlet opening and a second sound outlet opening are provided on an inner side of the housing, wherein the first sound outlet opening is acoustically coupled to the first diaphragm and the second sound outlet opening is acoustically coupled to the second diaphragm, and wherein the inner side is a side of the housing facing the ear canal opening in a worn state.

[0007] In some embodiments, it is provided that, in the worn state, an orthogonal projection of the centroid of the second sound outlet onto the sagittal plane of the human body is closer to the ear canal opening than an orthogonal projection of the centroid of the first sound outlet onto the sagittal plane of the human body.

[0008] In some embodiments, it is provided that, in the worn state, an orthogonal projection of the center of the second magnet onto the sagittal plane of the human body is closer to the ear canal opening than an orthogonal projection of the center of the first magnet onto the sagittal plane of the human body.

[0009] In some embodiments, it is provided that in a plane in which a surface of the first magnet facing the first membrane is located, the orthogonal projections of the second magnet and the first magnet overlap at least partially.

[0010] In some embodiments, it is provided that, when worn, the case protrudes at least partially into the concha of the ear and that a side surface of the case rests at least partially against the concha.

[0011] In some embodiments, the first membrane comprises a main area and a corrugated area surrounding the main area, wherein the main area comprises a domed dome, wherein a projection of the center of the second magnet onto the first membrane is located in an axial direction of the second magnet between the center of the dome and an inner edge of the corrugation, and wherein the inner edge of the corrugation is connected to the dome.

[0012] In some embodiments, the inner chamber comprises a first chamber and a second chamber that are separate from each other, with the first loudspeaker being located in the first chamber and the second loudspeaker being located in the second chamber.

[0013] In some embodiments, it is provided that a magnetic circuit in which the first magnet is located has a first distance of 2.85 mm to 3.42 mm to the magnetic circuit in which the second magnet is located in the direction of vibration of the first diaphragm.

[0014] In some embodiments, it is provided that a magnetic circuit in which the first magnet is located has a first distance of 3 mm to 3.2 mm to the magnetic circuit in which the second magnet is located in the direction of oscillation of the first membrane.

[0015] In some embodiments, it is provided that in a plane in which a surface of the first magnet facing the first membrane is located, the distance between an orthogonal projection of the centroid of the first membrane and an orthogonal projection of the centroid of the second membrane is 0 mm to 8 mm.

[0016] In some embodiments, the second loudspeaker further comprises a third magnet arranged around the second magnet.

[0017] In some embodiments, the second loudspeaker further comprises a fourth magnet, wherein the fourth magnet and the second magnet are arranged in the direction of vibration of the second diaphragm, and wherein the fourth magnet and the second magnet have the same magnetic poles, which are arranged opposite each other.

[0018] In some embodiments, the ratio of the area of ​​a cross-section of the second magnet in a direction perpendicular to the axis of the second magnet to the area of ​​a cross-section of the third magnet in a direction perpendicular to the axial direction of the third magnet is 0.1 to 4.

[0019] In some embodiments, the ratio of the cross-sectional area of ​​the second magnet in the direction perpendicular to the axis of the second magnet to the cross-sectional area of ​​the third magnet in the direction perpendicular to the axial direction of the third magnet is 0.4 to 0.6.

[0020] In some embodiments, the first loudspeaker comprises a first coil connected to the first diaphragm and located at least partially in a magnetic field formed by the first magnet, wherein the first coil, when energized, causes the first diaphragm to vibrate in order to produce sound, and wherein the value of the magnetic induction strength at any point of the first coil is greater than 0.45 T.

[0021] In some embodiments, the second loudspeaker comprises a second coil connected to the second diaphragm and located at least partially in a magnetic field formed by the second magnet, wherein the second coil, when energized, causes the second diaphragm to vibrate in order to produce sound, and wherein the value of the magnetic induction strength at any point on the second coil is greater than 0.3 T.

[0022] The embodiments described in this document further provide an acoustic output device comprising: a housing in which an inner chamber is formed; a support structure by which the housing is held in a position of the ear without blocking the external auditory canal; a first loudspeaker received in the inner chamber, wherein the first loudspeaker comprises a first magnet and a first diaphragm spaced apart from each other in a direction of vibration of the first diaphragm; and a second loudspeaker received in the inner chamber, wherein the second loudspeaker comprises a second magnet and a second diaphragm spaced apart from each other in a direction of vibration of the second diaphragm; and wherein the axis of the second magnet is inclined to the axis of the first magnet.

[0023] In some embodiments, it is provided that in a plane in which a surface of the first magnet facing the first membrane is located, an orthogonal projection of the second membrane is spaced apart from an orthogonal projection of the first membrane.

[0024] In some embodiments, it is provided that the sound emitted by the first loudspeaker has at least a partially lower frequency than the sound emitted by the second loudspeaker.

[0025] In some embodiments, a first sound outlet opening and a second sound outlet opening are provided in an underside of the housing, wherein the first sound outlet opening is acoustically coupled to the first diaphragm and the second sound outlet opening is acoustically coupled to the second diaphragm, and wherein the underside is a side of the housing facing away from the top of the user's head in a worn state.

[0026] In some embodiments, a first sound outlet opening is provided on the inside of the housing and a second sound outlet opening is provided on the underside of the housing, wherein the first sound outlet opening is acoustically coupled to the first diaphragm and the second sound outlet opening is acoustically coupled to the second diaphragm, and wherein the inside is a side of the housing facing the antihelix when worn and the underside is a side of the housing facing away from the top of the user's head when worn.

[0027] In some embodiments, the axis of the first magnet is perpendicular to the axis of the second magnet, and the first magnet and the second magnet are spaced apart from each other in the direction of oscillation of the second membrane.

[0028] In some embodiments, an angle of 10° to 45° is provided between the axis of the first magnet and the axis of the second magnet.

[0029] In some embodiments, it is provided that a magnetic circuit in which the first magnet is located has a third distance of 1.5 mm to 2.5 mm to the magnetic circuit in which the second magnet is located.

[0030] In some embodiments, it is provided that, when worn, the housing is positioned on the antihelix of the ear using the support structure and that a side surface of the housing partially rests against the antihelix.

[0031] In some embodiments, the inner chamber comprises a first chamber and a second chamber that are separate from each other, with the first loudspeaker being located in the first chamber and the second loudspeaker being located in the second chamber.

[0032] In some embodiments, the second loudspeaker further comprises a third magnet arranged around the second magnet.

[0033] In some embodiments, the second loudspeaker further comprises a fourth magnet, wherein the second magnet and the fourth magnet are arranged in the direction of vibration of the second diaphragm, and wherein the second magnet and the fourth magnet have the same magnetic poles, which are arranged opposite each other.

[0034] In some embodiments, the ratio of the cross-sectional area of ​​the second magnet in the direction perpendicular to the axis of the second magnet to the cross-sectional area of ​​the third magnet in the direction perpendicular to the axial direction of the third magnet is 0.1 to 4.

[0035] In some embodiments, the ratio of the cross-sectional area of ​​the second magnet in the direction perpendicular to the axis of the second magnet to the cross-sectional area of ​​the third magnet in the direction perpendicular to the axial direction of the third magnet is 0.4 to 0.6.

[0036] In some embodiments, the first loudspeaker comprises a first coil connected to the first diaphragm and located at least partially in a magnetic field formed by the first magnet, wherein the first coil, when energized, causes the first diaphragm to vibrate in order to produce sound, and wherein the value of the magnetic induction strength at any point on the first coil is 0.44T to 0.67T.

[0037] In some embodiments, the second loudspeaker comprises a second coil connected to the second diaphragm and located at least partially in a magnetic field formed by the second magnet, wherein the second coil, when energized, causes the second diaphragm to vibrate in order to produce sound, and wherein the value of the magnetic induction strength at any point on the second coil is 0.3T to 0.6T. Brief description of the characters

[0038] The present description is further illustrated by exemplary embodiments, which are described in detail by the accompanying drawings. Such embodiments are not limiting. In the embodiments, the same reference numerals denote the same structures. These show: Fig. 1 a schematic representation of an exemplary ear according to some embodiments of the present application; Fig. 2. A schematic representation of an open earphone in an exemplary worn state according to some embodiments of the present description; Fig. 3A a structural representation of an exemplary frame of an acoustic output device according to some embodiments of the present description; Fig. 3B a schematic representation of an exemplary structure of the acoustic output device according to some embodiments of the present description; Fig. 3C a schematic representation of an exemplary structure of the acoustic output device according to some other embodiments of the present description; Fig. 4 an exemplary representation of an internal structure of a first loudspeaker according to some embodiments of the present description; Fig. 5A a structural representation of a positional relationship or a representation of a magnetic field distribution between the first loudspeaker and a second loudspeaker according to some embodiments of the present description; Fig. 5B a representation of a magnetic field distribution of the first loudspeaker according to some embodiments of the present description; Fig. 6A a schematic representation of the acoustic output device in an exemplary worn state according to some embodiments of the present description; Fig. 6B a schematic representation of an exemplary distribution of a chamber structure arranged around one of two sound sources according to some embodiments of the present description; Fig. 7A a schematic representation of various relative positions of the first loudspeaker to the second loudspeaker in the horizontal direction according to some embodiments of the present description; Fig. 7B a schematic representation of a magnetic field distribution of the first loudspeaker and the second loudspeaker according to some embodiments of the present description; Fig. 7C a representation of a change trend of a magnetic induction strength at the endpoint of a first coil of the first loudspeaker at the various relative positions of the first loudspeaker to the second loudspeaker in the horizontal direction according to some embodiments of the present description; Fig. 7D a representation of a change trend of an average magnetic induction strength at the first coil according to some embodiments of the present description; Fig. 8 an exemplary structural representation of the second loudspeaker according to some embodiments of the present description; Fig. 9 a further exemplary structural representation of the second loudspeaker according to some embodiments of the present description; Fig. 10 a diagram of sound pressure level curves of the second loudspeaker in an embodiment with two magnets or three magnets according to some embodiments of the present description; Fig. 11A a schematic structural representation of a second magnet and a third magnet according to some embodiments of the present description; Fig. 11B a schematic structural representation of a second magnet and a third magnet according to some other embodiments of the present description; Fig. 11C a diagram illustrating results on the effect of the area ratio of the second magnet to the third magnet on the magnetic induction strength at the first coil according to some embodiments of the present description; Fig. 12 a further structural representation of the acoustic output device according to some embodiments of the present description; Fig. 13A a schematic representation of another way of carrying the acoustic output device according to some embodiments of the present description; Fig. 13B an exemplary structural representation of a sound baffle between the two sound sources according to some embodiments of the present description; Fig. 14 a schematic representation of a magnetic field distribution of the first loudspeaker and the second loudspeaker in a first embodiment according to some exemplary embodiments of the present description; Fig. 15 a schematic representation of a magnetic field distribution of the first loudspeaker and the second loudspeaker in a third embodiment according to some exemplary embodiments of the present description. Detailed designs

[0039] To further explain the technical solutions of the embodiments described in this document, the drawings required for describing these embodiments are briefly summarized below. Naturally, the following drawings represent only some examples or embodiments of the present description, and a person skilled in the art can apply the present description to other similar scenarios based on these drawings without inventive step. Unless obvious from the context or otherwise indicated, identical reference numerals in the drawings represent identical structures or processes.

[0040] 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.

[0041] As shown in the present description and in the claims, the terms "a" and / or "the" need not necessarily refer to the singular form, but may also include the plural form unless clearly indicated otherwise in the context. Generally speaking, the terms "comprise" and "contain" merely serve to indicate the inclusion of expressly identified steps and elements, and these steps and elements do not constitute an exclusive list. Methods or devices may also contain other steps or elements.

[0042] 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.

[0043] 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.

[0044] In this description, flowcharts are used to illustrate the processes performed by the system according to the embodiments described. It should be understood that preceding or subsequent processes do not necessarily have to be performed in the exact order shown. Rather, the individual steps can be processed in reverse order or concurrently. Furthermore, additional processes can be added to these processes, or one or more steps can be removed from them.

[0045] Fig. Figure 1 shows a schematic representation of an exemplary ear according to some embodiments of the present application. With reference to Fig. 1. The ear 100 can comprise an external auditory canal 101, a concha 102, a concha 103, a triangular fossa 104, an antihelix 105, a scapha 106, a helix 107, an earlobe 108, and a crus helicis 109. In some embodiments, the wearing and stabilization of an acoustic output device can be achieved using one or more sections of the ear 100. In some embodiments, the external auditory canal 101, the concha 102, the concha 103, the triangular fossa 104, and other sections have a specific depth and volume in three-dimensional space, such that the wearing requirements of the acoustic output device can be met. The acoustic output device (e.g. an in-ear earphone) can, for example, be worn in the outer ear canal 101.In some embodiments, the acoustic output device can be worn using a section of the ear 100 other than the external auditory canal 101. For example, the acoustic output 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 thereof. In some embodiments, the earlobe 108 and other sections of the user's ear can also be used to enhance comfort and safety when wearing the acoustic output device. By using sections of the ear 100 other than the external auditory canal 101 for wearing the acoustic output device and for sound propagation, the user's external auditory canal 101 can be "relieved," thus reducing the impact of the acoustic output device on the user's ear health.When the user wears the acoustic output device while out and about, the device does not block the external auditory canal 101, allowing the user to receive both sound from the device and ambient sound (e.g., a whistle, bicycle bell, surrounding conversations, audible traffic instructions, etc.), thus reducing the likelihood of a traffic accident. For example, when the acoustic output device is worn by the user, all or part of the device may be located in front of the crus helicis 109 (e.g., in the area indicated by the dashed line in ). Fig. 1 enclosed area J). As another example, in the case of the user-worn acoustic output device, the entire structure or part of the structure of the acoustic output device may be in contact with the upper region of the external auditory canal 101 (e.g., the region in which one or more of the sections crus helicis 109, cymba conchae 103, fossa triangularis 104, antihelix 105, scapha 106, helix 107, etc. are located). As yet another example, in the case of the user-worn acoustic output device, the entire structure or part of the structure of the acoustic output device may be located in one or more sections (e.g., cavum conchae 102, cymba conchae 103, fossa triangularis 104, etc.) of the ear (e.g., in the areas indicated by dashed lines in Fig. 1 enclosed areas M1 and M2).

[0046] Different users may have individual variations, resulting in different ear shapes, sizes, and other dimensions. For the sake of clarity and understanding, unless otherwise stated, this description primarily uses a standard-shaped and standard-sized ear model as a reference to illustrate how to wear the acoustic output devices in various embodiments. Based on standards ANSI S3.36, S3.25, and IEC 60318-7, for example, a simulator with a head including (left and right) ears, such as the GRAS KEMAR, HEAD Acoustics, or B&K 4128 / 5128 series, can be manufactured as a reference for wearing an acoustic output device to represent the situations of most users when wearing the device normally.Using GRAS KEMAR as an example, the ear simulator can be one of the following types: GRAS 45AC, GRAS 45BC, GRAS 45CC, or GRAS 43AG, etc. Using HEAD Acoustics as an example, the ear simulator can be one of the following types: HMS II.3, HMS II.3 LN, or HMS II.3LN HEC, etc. It should be noted that the data ranges determined in the exemplary embodiments of this description are based on GRAS 45BC KEMAR. However, it should be understood that variations may exist between different head and ear models, which can lead to fluctuations of ±10% in the relevant data ranges when using other models.As an example only, the ear serving as a reference may exhibit the following relevant characteristics: The dimension of the auricle's projection onto 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's projection onto the sagittal plane in one direction of the sagittal axis may range from 36.6 mm to 55 mm. The projection of the auricle onto the sagittal plane refers to the projection of the auricle's rim onto the sagittal plane. The rim of the auricle consists at least of the outer contour of the helix, the contour of the earlobe, the tragus contour, the intertragic notch, the antitragus tip, and the antitragohelic notch.Therefore, expressions such as "user-worn," "being in the worn state," and "in the worn state" in the present application can refer to the acoustic output device described in the present 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 100 can, of course, be designed differently depending on ear shapes and sizes. This differentiated design can be expressed in the fact that the characteristic parameters of one or more sections of the acoustic output 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.

[0047] It should be noted that in medicine and anatomy, three fundamental planes of section can be defined for the human body: the sagittal plane, the coronal plane, and the horizontal plane. Three fundamental axes can also be defined: the sagittal axis, the coronal axis, and the vertical axis. The sagittal plane is a plane of section perpendicular to the ground, running 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 parallel 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.

[0048] The above description of ear 100 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 in this application. For example, part of the structure of the acoustic output device can partially or completely obscure the external auditory canal 101. These changes and modifications fall within the scope of protection of this application.

[0049] Fig. Figure 2 shows a schematic representation of an acoustic output device in an exemplary worn state according to some embodiments described in this document. In some embodiments, an acoustic output device 10 may include, but is not limited to, an air conduction earphone and a bone conduction earphone. The acoustic output device 10 may be combined in some embodiments with products such as eyeglasses, a headset, a head-mounted display, an AR / VR headset, or the like. As shown in Figure 2, the acoustic output device 10 may be combined with products such as eyeglasses, a headset, a head-mounted display, an AR / VR headset, or the like. Fig. As shown in Figure 2, the acoustic output device 10 can comprise a housing 11 and a support structure 12. The housing 11 has an inner chamber, such that one or more loudspeakers are located in the inner chamber of the housing 11. The support structure 12 holds the housing 11 in place on the ear without blocking the external ear canal. In some embodiments, the support structure 12 can be an ear hook 12. In some embodiments, the housing 11 of the acoustic output device 10 can be worn on the user's body (e.g., on the head, neck, or upper torso) by means of the ear hook 12.

[0050] In some embodiments, when the acoustic output device 10 is worn, a first part of the ear hook 12 can be suspended between the auricle and the user's head, while a second part extends toward the side of the auricle facing away from the head and is connected to a sound-generating part 11 to secure the housing 11 at a location near the ear canal without obstructing it. In some embodiments, the ear hook 12 can be an arc-shaped structure adapted to the user's auricle to allow it to be suspended from the upper part of the auricle. In some embodiments, the ear hook 12 can also be designed as a clamping structure adapted to the user's auricle, allowing it to be clamped onto the auricle.In some embodiments, the ear hook 12 may, but is not limited to, include a hook structure, an elastic band or the like, so that the acoustic output device 10 can be better attached to the user's body to prevent it from falling out during use.

[0051] In some embodiments, the housing 11 can be designed to be worn on the user's body. The housing 11 contains loudspeakers (e.g., a first loudspeaker and / or a second loudspeaker) to generate sound that is input into the user's ear 100. In some embodiments, the acoustic output device 10 can be combined with products such as eyeglasses, a headset, a head-mounted display, an AR / VR headset, or the like. In this case, the housing 11 can be worn by hanging or clamping it at a location near the user's ear 100. In some embodiments, the housing 11 can be annular, elliptical, polygonal (regular or irregular), U-shaped, V-shaped, or semicircular, so that the housing 11 can be suspended directly from the user's ear 100.

[0052] Combined with Fig. 1 and Fig. 2 In some embodiments, when the user wears the acoustic output device 10, at least part of the housing 11 in area J at the front of the tragus of the user's ear 100 (see Fig. 1) or be positioned in areas M1 and M2 within the auricle. The following are examples of different wearing positions of the housing 11 (shown as positions 11A, 11B and 11C in Fig. 2) addressed. It should be noted that in the embodiments described in this document, the “anterior outer surface of the auricle” refers to the side of the auricle facing away from the head along the coronal axis. Similarly, the “posterior inner surface of the auricle” refers to the side of the auricle facing the head along the coronal axis. In some embodiments, the positioning of the housing 11 at position 11A means that the housing 11 is located on the side of the user’s ear 100 facing the face along the sagittal axis. That is, the housing 11 is located in region J on the front of the ear 100.

[0053] In some embodiments, one or more loudspeakers are arranged in the housing 11. The loudspeaker can be of a type corresponding to a frequency range, such as low-frequency loudspeaker (e.g., 30 Hz to 150 Hz), low- to mid-frequency loudspeaker (e.g., 150 Hz to 500 Hz), mid- to high-frequency loudspeaker (e.g., 500 Hz to 5 kHz), high-frequency loudspeaker (e.g., 5 kHz to 16 kHz), or broadband loudspeaker (e.g., 30 Hz to 16 kHz), or any combination thereof. The terms low frequency, high frequency, etc., here merely denote broad frequency ranges and can be categorized differently depending on the application. For example, a frequency crossover point can be defined, where low frequency refers to the frequency range below the crossover point and high frequency to the frequency range above the crossover point.This frequency cutoff point can be any value within the range audible to the human ear, e.g. 500 Hz, 800 Hz, 1000 Hz, 2000 Hz, 4000 Hz, 8000 Hz, etc.

[0054] In some embodiments, the loudspeaker may include a diaphragm. When the diaphragm vibrates, sound can be emitted from either the front or the back of the diaphragm. The cavity formed by the housing of the acoustic output device 10 is divided by the diaphragm into at least a front chamber in front of the diaphragm and a rear chamber behind the diaphragm. The front chamber is acoustically coupled to a sound outlet opening in the side of the housing, and the vibration of the diaphragm causes air vibration in the front chamber, thereby generating airborne sound. The airborne sound generated in the front chamber is radiated outwards through the sound outlet opening.

[0055] In some embodiments, the housing 11 can have a long-axis direction Y and a short-axis direction Z, which are perpendicular to the thickness direction X and orthogonal to each other. Here, the long-axis direction Y can be defined as the direction with the greatest extent in the two-dimensional projection surface of the housing 11 (e.g., the projection of the housing 11 onto the plane of its outer surface or onto the sagittal plane) (e.g., if the projection shape is rectangular or approximately rectangular, the long-axis direction corresponds to the length direction of the rectangle or the approximately rectangular rectangle). The short-axis direction Z can be defined as the direction that is perpendicular to the long-axis direction Y in the projection shape of the housing 11 onto the sagittal plane (e.g.,If the projection shape is rectangular or approximately rectangular, the direction of the short axis corresponds to the width direction of the rectangle or approximately the rectangle. The thickness direction X can be defined as the direction perpendicular to the two-dimensional projection surface. For example, it corresponds to the direction of the coronal axis and points in the left-right direction of the body. If the housing 11 is in an inclined position in the worn state, some embodiments provide that the direction Y of the long axis and the direction Z of the short axis are still parallel or approximately parallel to the sagittal plane, the direction Y of the long axis being able to have a certain angle to the direction of the sagittal axis, i.e., the direction Y of the long axis is also inclined accordingly, and the direction Z of the short axis being able to have a certain angle to the direction of the vertical axis., the direction Z of the short axis is also inclined.

[0056] In some embodiments, the entire structure or part of the structure of the housing 11 may project into the cavum conchae. This means that the projection of the housing 11 onto the sagittal plane and the projection of the cavum conchae onto the sagittal plane have an overlapping portion. For specific details regarding the carrying of the housing 11 at position 11B, reference may be made to other sections of this description, for example, to Fig. 6A and the associated description. In some embodiments, the housing 11 may also be in a horizontal or nearly horizontal position when worn, as for the housing 11 at position 11C in Fig. 2 is shown. In this case, the direction Y of the long axis can coincide with or approximately coincide with the direction of the sagittal axis, and both point in the front-back direction of the body, while the direction Z of the short axis can coincide with or approximately coincide with the direction of the vertical axis, and both point in the top-down direction of the body. For specific details regarding wearing the housing 11 at position 11C, reference may be made to the contents of other sections of this description, for example, to Fig. 13A and the accompanying description. If the wearing methods of the acoustic output device 10 (i.e., the relative positions of the housing 11 to the ear) differ, the loudspeaker of the acoustic output device 10 should be positioned accordingly to improve the sound output effect. Details regarding this are given in section 13A. Fig. 3A to 15 and the associated description were consulted. It should be noted that the approximately horizontal position of the housing 11 in the worn state may mean that the angle between the direction of the long axis of the housing 11 (as in Fig. 2 shown) and the sagittal axis lies within a certain range (e.g., not greater than 20°). Furthermore, the carrying positions of the housing 11 are not limited to those shown in Fig. The two positions shown, 11A, 11B and 11C, are limited. It is sufficient if they are in the positions shown. Fig. The areas J, M1, or M2 shown in section 1 may be located there. For example, the entire structure or part of the structure of housing 11 may be located in area J, which is indicated by the dashed line in section 1. Fig. 1 is enclosed. As another example, the entire structure or part of the structure of the case 11 may be in contact with one or more of the sections crus helicis 109, cymba conchae 103, fossa triangularis 104, antihelix 105, scapha 106, helix 107, etc., of the external auditory canal 101. As yet another example, the entire structure or part of the structure of the case 11 may be enclosed in a chamber (e.g., region M1, which includes at least the cymba conchae 103 and the fossa triangularis 104, and region M2, which includes at least the cavum conchae 102), both of which are in Fig. 1 enclosed by dashed lines) lie, which is formed by one or more sections of the ear 100 (e.g. the cavum conchae 102, the cymba conchae 103, the fossa triangularis 104 etc.).

[0057] To improve the stability of the acoustic output device 10 when worn, one of the following possibilities or a combination thereof can be used in some embodiments of the acoustic output device 10. For example, the ear hook 12 is at least partially designed as a profiled structure that conforms to at least one of the backs of the ear and the head in order to increase the contact area of ​​the ear hook 12 with the ear and / or the head and thereby increase the resistance to the acoustic output device 10 falling out of the ear. For example, the ear hook 12 is at least partially designed as an elastic structure so that it exhibits a certain degree of elasticity when worn in order to increase the positive pressure of the ear hook 12 on the ear and / or the head and thereby increase the resistance to the acoustic output device 10 falling out of the ear.For example, 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 housing 11 against the front of the ear to increase the resistance against the acoustic output device 10 falling out of the ear. For example, the housing 11 and the ear hook 12 are designed so that, when worn, they each clamp areas on the front and back of the ear containing physiological sections such as the antihelix and the cavum conchae, respectively, to increase the resistance against the acoustic output device 10 falling out of the ear.As another example, the housing 11 or an associated auxiliary structure is arranged such that it / they protrudes at least partially into physiological sections such as the cavum conchae, the cymba conchae, the fossa triangularis or the scapha in order to increase the resistance against the acoustic output device 10 falling out of the ear.

[0058] Fig. Figure 3A shows a structural representation of an exemplary frame of the acoustic output device according to some embodiments of the present description. Fig. Figure 3B shows a schematic representation of an exemplary structure of the acoustic output device according to some embodiments of the present description. Fig. Figure 3C shows a schematic representation of an exemplary structure of the acoustic output device according to some other embodiments described in this document. As in Fig. As shown in Figures 3A to 3C, an acoustic output device 300 comprises a housing 310, a support structure 320, a first loudspeaker 330, and a second loudspeaker 340. In some embodiments, the housing 310 may be a hollow frame body. An inner chamber is formed in the housing 310, which serves to accommodate the other components (e.g., the first loudspeaker 330 and the second loudspeaker 340) of the acoustic output device 300. In some embodiments, the housing 310 may also serve to protect the components accommodated in the inner chamber. Examples are shown in Fig. 3B and Fig. Figure 3C shows two different positional relationships between the first loudspeaker 330 and the second loudspeaker 340.

[0059] The support structure 320 can be used to support the acoustic output device 300. When the acoustic output device 300 is in the worn position, the support structure 320 rests against the ear and supports the housing 310, thus allowing the housing 310 to be worn at a location on the ear without obstructing the external auditory canal. The phrase "without obstructing the external auditory canal" can mean that the external auditory canal remains at least partially connected to the outside environment. In some embodiments, the support structure 320 may include an ear hook; further explanations regarding the ear hook refer to the description of the ear hook 12 in [reference to be added]. Fig. 2 can be referenced. This will not be repeated here.

[0060] The first loudspeaker 330 is housed in the inner chamber of the enclosure 310. The first loudspeaker 330 can convert electrical signals into sound signals and output them. In some embodiments, the first loudspeaker 330 can comprise a first magnet 331 and a first diaphragm 332. The first magnet 331 and the first diaphragm 332 are spaced apart from each other in one direction of vibration of the first diaphragm 332. The first diaphragm 332 allows the inner chamber of the enclosure 310 to be divided into a first front chamber and a first rear chamber. The first front chamber of the first loudspeaker 330 can refer to a chamber formed on a side of the first diaphragm 332 facing away from the first magnet 331 (also referred to as the front of the first diaphragm 332).The first rear chamber of the first loudspeaker 330 can refer to a chamber formed on a side of the first diaphragm 332 facing the first magnet 331 (also referred to as the rear of the first diaphragm 332) or on a side of the first magnet 331 facing away from the first diaphragm 332. The first magnet 331 is used to generate a magnetic field. The first diaphragm 332 can be connected to a coil. When the coil is energized, it vibrates under the influence of the magnetic field, thus causing the first diaphragm 332 to vibrate. During the vibration of the first diaphragm 332, sound is generated at both the front and rear of the first diaphragm 332. The sound generated at the front of the first diaphragm 332 is radiated outwards via the first front chamber, and the sound generated at the rear of the first diaphragm 332 is radiated outwards via the first rear chamber.

[0061] Fig. Figure 4 shows an exemplary representation of the internal structure of a first loudspeaker according to some embodiments described in this document. A support 334 is arranged around the first diaphragm 322, the first coil 333, and the magnetic circuit assembly 336, and serves to provide a mounting and fastening platform. The first loudspeaker 330 can be connected to the housing 310 of the acoustic output device 300 via the support 334. The first coil 333 projects into the magnetic circuit assembly 336 and is connected to the first diaphragm 322. The magnetic circuit assembly 336 exerts a force on the energized first coil 333, causing the first diaphragm 322 to vibrate mechanically. This generates sound, which propagates through a medium such as air and is emitted through the sound outlet.In some embodiments, the magnetic circuit arrangement 336 comprises a magnetically conductive plate 3361, a first magnet 331, and a receiving element 3363. The magnetically conductive plate 3361 and the first magnet 331 are connected to each other. The side of the first magnet 331 furthest from the magnetically conductive plate 3361 is mounted on the bottom wall of the receiving element 3363, and a gap exists between the circumference of the first magnet 331 and the inner side wall of the circumference of the receiving element 3363. In some embodiments, the outer side wall of the circumference of the receiving element 3363 is connected to and attached to the support 334. In some embodiments, the receiving element 3363 comprises a bottom 3363a and a circumferential side wall 3363b.The base 3363a of the receiving element and the side wall 3363b enclose a receiving chamber in which the magnetically conductive plate 3361 and the first magnet 331 are housed. The magnetically conductive plate 3361 and the first magnet 331 are connected to each other. The side of the first magnet 331 furthest from the magnetically conductive plate 3361 is mounted on the base 3363a of the receiving element, and a gap exists between the circumference of the first magnet 331 and the circumferential side wall 3363b of the receiving element 3363. In some embodiments, the first coil 333 can project into the gap between the first magnet 331 and the side wall 3363b.

[0062] In some embodiments, the first loudspeaker 330 can be used as a low-frequency loudspeaker or a low- to mid-frequency loudspeaker, wherein the first sound emitted by the first loudspeaker 330 is either low-frequency sound or low- to mid-frequency sound. In some embodiments, it is provided that sound, e.g., low-frequency or low- to mid-frequency sound, is emitted from the first loudspeaker 330 to the outside via the first front chamber and a first sound outlet opening provided in the housing 310. In some embodiments, it is provided that a second loudspeaker 340 can be arranged in the acoustic output device 300 to ensure that the acoustic output device 300 can emit sound over the full frequency band, i.e.,that the acoustic output device 300 can also output high-frequency sound simultaneously with the output of low-frequency or low- to medium-frequency sound.

[0063] The second loudspeaker 340 is housed in the inner chamber of the enclosure 310. The second loudspeaker 340 can convert electrical signals into sound signals and output them. In some embodiments, the second loudspeaker 340 can be used as a high-frequency loudspeaker, with the second sound output by the second loudspeaker 340 being high-frequency sound. In some embodiments, it is possible that there is no overlap between the frequency range of the first sound output by the first loudspeaker 330 and the frequency range of the second sound output by the second loudspeaker 340. For example, the minimum frequency in the frequency range of the second sound is higher than the maximum frequency in the frequency range of the first sound.In some embodiments, there may be an overlap between the frequency range of the first sound emitted by the first loudspeaker 330 and the frequency range of the second sound emitted by the second loudspeaker 340. For example, the minimum frequency in the frequency range of the second sound may not exceed the maximum frequency in the frequency range of the first sound, and the maximum frequency in the frequency range of the second sound may be higher than the maximum frequency in the frequency range of the first sound. In some embodiments, the frequency band may be defined as follows: Considering that the first loudspeaker 330 could emit high-frequency sound at low volume, sound amplitude points within a frequency band may be considered as a reference.Frequency points that fall below a certain threshold relative to the highest amplitude point can then be defined as boundary points for that frequency band. This threshold frequency point could be one that corresponds to an amplitude point that is a certain percentage of the highest amplitude point. For example, it could be a frequency point that corresponds to an amplitude point that is 5%, 10%, 15%, etc., of the highest amplitude point. It should be noted that the terms "low frequency," "lower to medium frequency," and "high frequency" here simply refer to the relative magnitude of the frequency and may be categorized differently in various application scenarios.For example, a frequency crossover point can be defined, where low frequency refers to the frequency range below the crossover point and high frequency to the frequency range above the crossover point. This crossover point can be any value within the range audible to the human ear, e.g., 500 Hz, 800 Hz, 1000 Hz, 2000 Hz, 4000 Hz, 8000 Hz, etc. Furthermore, it should be clarified that the terms "high frequency" and "low frequency" in this description refer to the relatively higher and lower frequencies in a comparative context. For example, using the first loudspeaker as a low-frequency loudspeaker and the second loudspeaker as a high-frequency loudspeaker could mean that, in a comparison between the two, the first loudspeaker will emit sound at a lower frequency, while the second loudspeaker will emit sound at a higher frequency.

[0064] The first loudspeaker 330 and the second loudspeaker 340 are designed to each output sound in different frequency ranges. For example, the first loudspeaker 330 is used for outputting low-frequency or low- to mid-frequency sound, while the second loudspeaker 340 is used for outputting high-frequency sound. This improves the acoustic output device's performance across a wider frequency band.

[0065] In some embodiments, the second loudspeaker 340 can comprise a second magnet 341 and a second diaphragm 342. The second magnet 341 and the second diaphragm 342 are spaced apart from each other in one direction of vibration of the second diaphragm 342. The second diaphragm 342 allows the inner chamber of the housing of the second loudspeaker 340 to be divided into a second front chamber and a second rear chamber. The second front chamber of the second loudspeaker 340 can refer to a chamber formed on a side of the second diaphragm 342 facing away from the second magnet 341 (also referred to as the front of the second diaphragm 342).The second rear chamber of the second loudspeaker 340 can refer to a chamber formed on a side of the second diaphragm 342 facing the second magnet 341 (also referred to as the rear of the second diaphragm 342) or on a side of the second magnet 341 facing away from the second diaphragm 342. The second magnet 341 can be used to generate a magnetic field. When the second diaphragm 342 vibrates, sound is generated on both the front and rear of the second diaphragm 342. The sound generated on the front of the second diaphragm 342 is radiated outwards through the second front chamber and a second sound outlet, which is acoustically in communication with the second front chamber. In some embodiments, the first and second sound outlets are two separate sound outlets.The first sound outlet serves to radiate the sound generated by the first loudspeaker 330 outwards, and the second sound outlet serves to radiate the sound generated by the second loudspeaker 340 outwards. In other words, the first loudspeaker 330 and the second loudspeaker 340 do not share a sound outlet, and the first front chamber of the first loudspeaker 330 is not in communication with the second front chamber of the second loudspeaker 340.

[0066] In some embodiments, the second loudspeaker 340 may include a second coil and a magnetic circuit arrangement. When the second coil is energized, the magnetic circuit arrangement exerts a force on the energized second coil. This causes the second coil to vibrate under the influence of the magnetic field and drives the second diaphragm 342 to generate mechanical vibrations. In this way, sound is produced, which propagates through a medium such as air. In some embodiments, the magnetic circuit arrangement of the second loudspeaker 340 may include one or more magnets. For example, the magnetic circuit arrangement of the second loudspeaker 340 may include a second magnet 341. To further increase, for example, the magnetic field strength at the second coil, a third magnet may be arranged around the circumference of the second magnet 341.The second magnet 341 and the third magnet form a magnetic circuit in which the second coil is located. For example, the magnetic circuit arrangement of the second loudspeaker 340 can additionally include a fourth magnet. Specific embodiments with a different number of magnets within the magnetic circuit arrangement can be found elsewhere in this description, for example in . Fig. 8 and Fig. 9 and the accompanying descriptions. It should further be noted that, in the case of the second loudspeaker 340 as a high-frequency loudspeaker, the magnetic circuit arrangement of the second loudspeaker 340 may not include a receiving element in order to ensure a small size for the second loudspeaker 340. In particular, in some embodiments, the second loudspeaker 340 may include a spacer plate (not shown). The spacer plate supports the magnetic circuit arrangement of the second loudspeaker 340 and acts together with the housing 310 to secure the second loudspeaker 340. In some embodiments, the spacer plate may be a metallic element with magnetic conductivity that is connected to the housing 310 by methods such as embedding or snapping.

[0067] Fig. Figure 5A shows a structural representation of a positional relationship between the first loudspeaker and the second loudspeaker according to some embodiments described in this document. As in Fig. As shown in 5A, the first loudspeaker 330 and the second loudspeaker 340 can be in a vibration direction of the first diaphragm 332 (i.e., a first vibration direction in Fig. 5A) or stacked on top of each other and spaced apart in a second direction of oscillation of the second diaphragm 342. In this case, the first magnet 331 and the second magnet 341 are spaced apart from each other in the direction of oscillation of the first diaphragm 332. In some embodiments, the first direction of oscillation of the first diaphragm 332 is parallel to the second direction of oscillation of the second diaphragm 342. The direction of oscillation of the first diaphragm 332 is parallel to the axis of the first magnet 331. The direction of oscillation of the second diaphragm 342 is parallel to the axis of the second magnet 341. In some embodiments, a certain angle may be included between the axis of the first magnet 331 and the axis of the second magnet 341. This angle is, for example, 1°, 5°, 10°, 30°, etc.In this case, a corresponding angle is also included between the vibration direction of the first membrane 332 and the vibration direction of the second membrane 342. The magnets (the first magnet 331 and the second magnet 341) each have a south pole (S-pole) and a north pole (N-pole). The axial direction of the magnet can refer either to the direction of its polarization or to the direction of the axis of symmetry for its structure.

[0068] In some embodiments, the magnetic poles of the first magnet 331 and the second magnet 341 are arranged opposite each other. As in Fig. As shown in Figure 5A, for example, the N-pole of the first magnet 331 and the N-pole of the second magnet 341 are arranged opposite each other. In other embodiments, the S-pole of the first magnet 331 and the S-pole of the second magnet 341 are arranged opposite each other. A repulsive interaction force exists between the first magnet 331 and the second magnet 341. Furthermore, a first magnetic field and a second magnetic field are coupled. This manifests itself in the fact that the second magnetic field generated by the second magnet 341 influences the distribution of the first magnetic field generated by the first magnet 331. In comparison, the first magnet 331 is arranged individually (as in Figure 5A). Fig. 5B shown, in Fig. 5B shows the magnetic flux lines at the single first magnet 331), is in a Fig. The structure shown in 5A, for example, provides that, with reference to the one in Fig. The magnetic flux lines shown in Figure 5A indicate that the extent of the propagation of the magnetic flux lines radiating into space from the first magnet 331 can be suppressed by the second magnet 341, so that more of the magnetic flux lines propagated into space from the N-pole of the first magnet 331 are "limited" to the vicinity of the first coil. This increases the magnetic field strength at the first coil of the first loudspeaker 330 and thus improves the sensitivity of the first loudspeaker 330. Simultaneously, the first magnetic field generated by the first magnet 331 could influence the distribution of the second magnetic field generated by the second magnet 341. This increases the magnetic field strength at the second coil of the second loudspeaker 340 and thus improves the sensitivity of the second loudspeaker 340.

[0069] In the Fig. In the embodiment shown in Figure 5A, the value of the repulsive force between the first magnet 331 and the second magnet 341 should be greater than 0.08 N. The value of the repulsive interaction force between the first magnet 331 and the second magnet 341 is measured as follows: First, a device is made to fix the first magnet 331 and the second magnet 341 at their actual distance and relative position. Then, one of the two magnets, either the first magnet 331 or the second magnet 341, is connected to a spring dynamometer, this fixing device is removed, and the reading of the dynamometer at this point is recorded. Finally, the value of the repulsive force between the first magnet 331 and the second magnet 341 is determined from the reading of the dynamometer.

[0070] In some embodiments, the axis of the first magnet 331 can be arranged at a distance from the axis of the second magnet 341. As in Fig. As shown in Figure 5A, the axis of the first magnet 331 is designated a1 and the axis of the second magnet 341 a2. The arrangement of a1 spaced apart from a2 means that the two axes do not coincide. The axis a1 of the first magnet 331 is parallel to and spaced apart from the axis a2 of the second magnet 341. This parallel arrangement of the axis a1 of the first magnet 331 and the axis a2 of the second magnet 341 improves the suppression of magnetic leakage from the first magnet 331 by the second magnet 341. That is, the effect of limiting the magnetic flux lines emitted by the first magnet 341 through the second magnet 341 is enhanced, thereby increasing the magnetic induction strength at the first coil of the first loudspeaker 330.Due to the spaced arrangement of the axis a1 of the first magnet 331 and the axis a2 of the second magnet 341, the second loudspeaker 340 can move away from the area of ​​the first diaphragm 332 closest to it in the first direction of vibration, i.e., the central area of ​​the first diaphragm 332 (e.g., a dome of the first diaphragm 332 described below). This ensures that the first diaphragm 332 does not collide with the second loudspeaker 340 when vibrating, i.e., that the second loudspeaker 340 does not influence the vibration of the first diaphragm 332. Based on this, the distance between the second loudspeaker 340 and the first loudspeaker 30 can be further reduced, thereby strengthening the coupling of the first magnet 331 with the second magnet 341 and reducing the overall dimensions of the acoustic output device 300.

[0071] Fig. Figure 6A shows a schematic representation of the acoustic output device in an exemplary worn state according to some embodiments described in this document. As shown in Fig. As shown in Figure 6A, in some embodiments the housing 310 is provided that, when worn, it can project at least partially into the concha of the ear and that a side surface of the housing 310 rests at least partially against the concha. In some embodiments, the housing 310 can have a connecting end CE, which is connected to the support structure 320, and a free end FE, which is not connected to the support structure 320. For example, when worn, the free end FE of the housing 310 can project into the concha, as shown in Figure 6A. Fig. Figure 6A illustrates this. Optionally, the housing 310 and the support structure 320 can be arranged to jointly clamp an ear region corresponding to the concha from the front and back of the aforementioned ear region to increase the resistance against the acoustic output device 300 falling out of the ear and thus improve the stability of the acoustic output device 300 when worn. For example, the free end FE of the housing 310 can press into the concha in a thickness direction X. As another example, the free end FE can rest on the inside of the concha in the Y direction of the long axis and / or the Z direction of the short axis (e.g., on the inner wall of the concha opposite the free end FE). Here, the free end FE of the housing 310 refers to an end region of the housing 310 that is opposite the attachment end connected to the support structure 320.The housing 310 can have a regular or irregular structure. To further explain the free end FE of the housing 310, an example is given below. For instance, if the housing 310 has a cuboid structure, the wall surface of the end of the housing 310 is a flat surface. In this case, the free end FE of the housing 310 is an end-region side wall of the housing 310 opposite the mounting end connected to the support structure 320. As another example, if the housing 310 has a spherical, ellipsoidal, or irregular structure, the free end FE of the housing 310 can be a specific region obtained by a section of the housing 310 along the YZ plane (the plane spanned by the Z direction of the short axis and the X direction of the thickness) and located far from the mounting end.It should be noted that, in addition to the free end FE of the housing 310 protruding into the concha, it is also possible for an orthogonal projection of the free end to fall onto the antihelix, or for this orthogonal projection to fall onto the left or right side of the head and lie on the sagittal axis of the human body in front of the ear. In other words, the support structure 320 can support the housing 310 so that it is worn at a specific location, such as the concha, the antihelix, or the front of the ear.

[0072] The acoustic output device 300 is described below using the example of the one in Fig. The acoustic output device 300 shown in Figure 6A is described in detail. It should be noted that the structure and corresponding parameters of the acoustic output device 300 are shown in Figure 6A. Fig. 6A - provided that no acoustic principles are violated - are also applicable to acoustic output devices of other designs mentioned herein.

[0073] By extending at least a portion of the housing 310 into the cavum conchae, the audible loudness at the listening position (e.g., at the ear canal opening) can be increased, particularly the audible loudness at high frequencies, while simultaneously maintaining the cancellation effect for sound loss in the far field. For illustrative purposes only, the housing 310 and the cavum conchae form a chamber-like structure (hereinafter referred to as the "chamber-like structure") when the entire structure or a portion thereof projects into the cavum conchae. In the embodiments described herein, the chamber-like structure can be understood as a semi-enclosed structure formed jointly by the side wall of the housing 310 and the structure of the cavum conchae.This semi-enclosed structure is not completely sealed off from the environment, but rather has a leakage structure (e.g., an opening, a gap, a tube) that allows acoustic communication with the environment. When the user wears the acoustic output device 300, one or more sound outlet openings may be provided on the side of the housing 310 of the acoustic output device 300 facing the user's ear canal or closest to it. One or more pressure relief openings may be provided on other side walls of the housing (e.g., the side wall facing away from or farther from the user's ear canal). For example, if only one sound outlet opening is provided in the housing 310, the first loudspeaker 330 and the second loudspeaker 340 share this sound outlet opening.If, for example, the housing 310 has two sound outlet openings, one opening is used for the output of high-frequency sound and the other for the output of low-frequency or low- to medium-frequency sound. If, for example, the housing 310 has more than two sound outlet openings, some are used for the output of high-frequency sound and some for the output of low-frequency or low- to medium-frequency sound. For example, in a housing 310 with one sound outlet opening and one pressure relief opening: The sound outlet opening is acoustically coupled to the front chamber of the acoustic output device 300, while the pressure relief opening is acoustically coupled to the rear chamber of the acoustic output device 300.The sound emitted from the sound outlet and the sound emitted from the pressure relief opening can be approximated as two sound sources whose sound waves have opposite phases. The housing 310 and the corresponding inner wall of the cavum conchae form a chamber-like structure, wherein the sound source corresponding to the sound outlet is located inside the chamber-like structure and the sound source corresponding to the pressure relief opening is positioned outside the chamber-like structure, thus the in . Fig. The acoustic model shown in 6B is formed.

[0074] Fig. Figure 6B shows a schematic representation of an exemplary distribution of a chamber structure arranged around one of two sound sources according to some embodiments described in this document. As in Fig. As shown in Figure 6B, the chamber-like structure 502 can contain a listening position and at least one sound source 501A. Here, "contains" can mean that at least one of the listening position or sound source 501A is located inside the chamber-like structure 502, or that at least one of the listening position or sound source 501A is located at the inner edge of the chamber-like structure 502. The listening position can correspond to the entrance of the ear canal, but also to an acoustic reference point of the ear, such as the ear reference point (ERP), the eardrum reference point (DRP), etc., or to an entrance structure facing the listener. Since the sound source 501A is enclosed by the chamber-like structure 502, most of the sound emitted by it will reach the listening position by direct radiation or reflection.Accordingly, the omission of the chamber-like structure 502 would result in most of the sound emitted by sound source 501A not reaching the listening position. Therefore, the inclusion of the chamber structure significantly increases the loudness of the sound that does reach the listening position. Simultaneously, only a small portion of the out-of-phase sound emitted by the out-of-phase sound source 501B outside the chamber-like structure 502 can pass through the leakage structure 503 of the chamber-like structure 502 into its interior. This corresponds to the generation of a secondary sound source 501B' at the leakage structure 503, the intensity of which is significantly lower than that of sound source 501B and also significantly lower than that of sound source 501A.The sound generated by the secondary sound source 501B' causes a weak out-of-phase cancellation in the chamber with respect to the sound source 501A, thereby significantly increasing the perceived loudness at the listening position. Regarding sound loss, it is assumed that the sound radiated from the sound source 501A to the outside environment via the leakage structure 503 of the chamber corresponds to a secondary sound source 501A' generated at the leakage structure 503. Since almost all the sound radiated by the sound source 501A is emitted through the leakage structure 503, and the structural dimensions of the chamber-like structure 502 are much smaller than the room dimensions used for evaluating sound loss (by at least an order of magnitude), the strength of the secondary sound source 501A' is considered to be equivalent to that of the sound source 501A.For the outdoor area, the secondary sound source 501A' and the sound source 501B provide double sound source cancellation to reduce sound loss.

[0075] In specific application scenarios, the outer surface of the housing 310 is typically flat or curved, while the contour of the user's concha 102 has an uneven structure. Due to the partial or complete intrusion of the housing 310's structure into the concha, a chamber-like structure connected to the external environment is formed between the housing 310 and the contour of the concha. Furthermore, by providing the sound outlet opening at the position of the housing 310 facing the user's ear canal opening and close to the edge of the concha 102, and by providing the pressure relief opening at the position of the housing 310 facing away from or far from the ear canal opening, the in Fig. The acoustic model shown in 6B can be implemented. This allows the hearing position at the user's ear opening to be increased and the sound loss in the far field to be reduced in the user-worn acoustic output device 300.

[0076] In some embodiments, a first sound outlet opening and a second sound outlet opening can be provided on the inside of the housing 310. In the case of the Fig. In the wearing method shown in Figure 6A, the inside of the housing 310 refers to a side surface of the housing 310 facing the ear canal opening when worn. The first sound outlet is acoustically coupled to the first diaphragm 332. When the first diaphragm 332 vibrates, sound generated on a side of the first diaphragm 332 facing away from the first magnet 331 is radiated outwards via the first anterior chamber and the first sound outlet. The second sound outlet is acoustically coupled to the second diaphragm 342. When the second diaphragm 342 vibrates, sound generated on a side of the second diaphragm 342 facing away from the second magnet 341 is radiated outwards via the second anterior chamber and the second sound outlet.In some embodiments, the first front chamber of the first loudspeaker 330 is not acoustically in communication with the second front chamber of the second loudspeaker 340, and the first loudspeaker 330 and the second loudspeaker 340 do not share a sound outlet. That is, the first sound outlet serves exclusively to radiate the low-frequency or low- to mid-frequency sound outwards, which is generated by the vibration of the first diaphragm 332. The second sound outlet serves exclusively to radiate the high-frequency sound outwards, which is generated by the vibration of the second diaphragm 342.Because both the first and second sound outlet openings are provided on the inside of the housing 310, and the sound produced by the first loudspeaker 330 is radiated outwards via the first sound outlet opening, and the sound produced by the second loudspeaker 340 via the second sound outlet opening (i.e., the two loudspeakers do not share a sound outlet opening), the external structure of the second loudspeaker can be simplified (for example, the thickness of the housing 310 can be reduced). This is because the second loudspeaker 340 is typically a packaged structure, and the second loudspeaker 340 is inserted as a whole into the first front chamber of the first loudspeaker 330.If the first loudspeaker 330 and the second loudspeaker 340 share a sound outlet, this would result in the first sound outlet being located outside the second sound outlet (at this point, both loudspeakers must radiate sound outwards through the first sound outlet, so that it serves as a common sound outlet). Compared to an arrangement without a common sound outlet, where the first and second sound outlets are offset from each other inside the housing 310, this would result in a larger overall dimension of the acoustic output device 300, in particular a greater thickness of the housing 310.Since the two loudspeakers do not share a sound outlet, it is also possible for the sound emitted by the first loudspeaker 330 and the sound emitted by the second loudspeaker 340 to not interfere with each other, thus reducing the mutual radiation impedance.

[0077] In some embodiments, the housing 310 may also include a pressure relief opening that is acoustically coupled to the first diaphragm 332. When the first diaphragm 332 vibrates, sound generated on a side of the first diaphragm 332 facing the first magnet 331 is radiated outwards via the first rear chamber and the pressure relief opening. In some embodiments, the pressure relief opening may be located in a side surface of the housing 310 that is adjacent to or opposite the inner surface. In some embodiments, the first loudspeaker 330 emits low-frequency sound, with the first diaphragm 332 vibrating with a larger amplitude. This results in an increased sound pressure in the first front and first rear chambers of the first loudspeaker 330.When the pressure relief opening is arranged in the housing 310, this pressure relief opening can serve to equalize the sound pressure between the first front and the first rear chamber. This ensures that the gas in the first rear chamber does not impede the vibration of the first diaphragm 332, thus guaranteeing the effective output of low-frequency sound by the first loudspeaker 330.

[0078] In some embodiments, the inner chamber of the housing 310 may comprise a first chamber and a second chamber, which are separate from each other, with the first loudspeaker 330 being housed in the first chamber and the second loudspeaker 340 being housed in the second chamber. In some embodiments, a partition plate may be formed in the housing 310, which divides the inner chamber of the housing 310 into a first chamber for housing the first loudspeaker 330 and a second chamber for housing the second loudspeaker 340. In this case, the first diaphragm 332 of the first loudspeaker 330 divides the first chamber into a first front chamber and a first rear chamber.The first front chamber is acoustically coupled to the first sound outlet, so that sound generated on the front of the first diaphragm 332 is radiated outwards via the first front chamber and the first sound outlet. The second diaphragm 342 of the second loudspeaker 340 divides the second chamber into a second front chamber and a second rear chamber. The second front chamber is acoustically coupled to the second sound outlet, so that sound generated on the front of the second diaphragm 342 is radiated outwards via the second front chamber and the second sound outlet. Optionally, the aforementioned partition can be a circuit board carrying electronic elements within the second loudspeaker 340, or a magnetically conductive element of the magnetic circuit arrangement.In this arrangement, the first loudspeaker 330 and the second loudspeaker 340 do not share the same chamber; that is, there is no acoustic communication between the first diaphragm 332 and the second diaphragm 342. This means that the first front chamber of the first loudspeaker 330 is not in acoustic communication with the second front chamber of the second loudspeaker 340, and the first loudspeaker 330 and the second loudspeaker 340 do not share a sound outlet. This prevents the sound emitted by the first loudspeaker 330 and the sound emitted by the second loudspeaker 340 from interfering with each other, thus reducing their mutual radiation impedance.

[0079] In some embodiments, the second sound outlet, when worn, can be located closer to the ear canal opening than the first; that is, the outlet corresponding to the high-frequency loudspeaker is closer to the ear canal opening. By way of example only, when worn, an orthogonal projection of the centroid of the second sound outlet onto the sagittal plane of the human body is closer to the ear canal opening than an orthogonal projection of the centroid of the first sound outlet onto the sagittal plane of the human body. An orthogonal projection is a projection obtained by projecting onto a projection plane in a perpendicular direction. In this embodiment, the projection plane is the sagittal plane of the human body, and the projection direction is the direction of the coronal axis.Given the strong directional nature of the high-frequency sound emitted by the second loudspeaker 340, the audible loudness of the high-frequency sound emitted by the second loudspeaker can be increased by positioning the second sound outlet closer to the ear canal opening, thus improving the acoustic output of the acoustic output device 300. In some embodiments, the first sound outlet can be arranged around the second sound outlet to ensure that the acoustic output device 300 can emit sound across the entire frequency band.

[0080] It can be seen that the individual side walls of the housing have a certain thickness, as the first and second sound outlets are provided within the housing. Thus, the first and second sound outlets are holes of a certain depth. In this case, the first and second sound outlets can each have inner and outer openings. For the sake of simplicity, the centroid of the first and second sound outlets, respectively, in the embodiments described in this text, can refer to the centroid of an outer opening of each sound outlet.

[0081] In some embodiments, the center of the second magnet 341 can be located closer to the ear canal opening than the center of the first magnet 331 when worn. By way of example, when worn, an orthogonal projection of the center of the second magnet 341 onto the sagittal plane of the human body is located closer to the ear canal opening than an orthogonal projection of the center of the first magnet 331 onto the sagittal plane of the human body. The center of each magnet is the centroid of the magnet facing the end face of the diaphragm. Because the center of the second magnet 341 is located closer to the ear canal opening, sound emitted by the vibration of the second diaphragm 342 of the second loudspeaker can reach the ear canal opening after a short propagation time.This allows the audible volume of the high-frequency sound emitted by the second loudspeaker to be increased, thus improving the sound effect of the acoustic output device 300.

[0082] By adjusting the relative positions of the first magnet 331 and the second magnet 341 in a direction perpendicular to the direction of vibration of the membrane (e.g., in a horizontal direction) Fig. 5A) The effect of the magnetic field coupling relationship between the first magnet 331 and the second magnet 341 can be ensured for the amplification of the magnetic induction strength at the first coil of the first loudspeaker, thereby increasing the radiated sound pressure level of the first loudspeaker. In particular, in some embodiments, it is provided that in a plane of a surface of the first magnet 331 facing the first diaphragm 332 (i.e., in a reference plane perpendicular to the direction of vibration of the first diaphragm 332), the orthogonal projections of the second magnet 341 and the first magnet 331 overlap at least partially. This allows the magnetic induction strength at the first coil in the first magnetic field generated by the first magnet 331 to be amplified by the second magnetic field generated by the second magnet 341.This means that the second magnetic field generated by the second loudspeaker 340 serves to amplify the first magnetic field generated by the first loudspeaker 330, thereby increasing the sound pressure level of the low-frequency sound emitted by the first loudspeaker 330. Furthermore, it is... Fig. 7D shows that the average magnetic induction strength at the first coil with a movement distance of the second loudspeaker 340 in the horizontal direction (as in Fig. (described in 5A) varies. Therefore, the size of the overlap area between the orthogonal projection of the second magnet 341 above and the orthogonal projection of the first magnet 331 could influence the average magnetic induction strength at the first coil. The larger the overlap area between the orthogonal projection of the second magnet 341 above and the orthogonal projection of the first magnet 331 (where the maximum value of the area of ​​the orthogonal projection corresponds to that of the first magnet 331 and the second magnet 341, which has a larger orthogonal projection area), the greater the average magnetic induction strength at the first coil. A more detailed explanation of Fig. 7D is described below.

[0083] The relative position of the first membrane 332 to the second membrane 342 in the direction perpendicular to the direction of vibration (for example, in the horizontal direction) Fig. 5A) can determine the relative position of the first magnet 331 to the second magnet 341, thereby influencing the coupling between the first magnetic field generated by the first loudspeaker 330 and the second magnetic field generated by the second loudspeaker 340. In particular, in some embodiments, it is provided that in a plane of a surface of the first magnet 331 facing the first diaphragm 332 (i.e., in a reference plane perpendicular to the direction of vibration of the first diaphragm 332), the orthogonal projections of the second diaphragm 342 and the first diaphragm 332 overlap at least partially. In this case, the distance between the first diaphragm 332 and the second diaphragm 342 in a direction perpendicular to the direction of vibration is not excessively large. This allows the magnetic induction strength at the first coil in the first magnetic field generated by the first magnet to be amplified by the second magnetic field generated by the second magnet.This means that the second magnetic field generated by the second loudspeaker 340 serves to amplify the first magnetic field generated by the first loudspeaker, thereby increasing the sound pressure level of the low-frequency sound emitted by the first loudspeaker 340. The plane of the surface of the first magnet 331 facing the first diaphragm 332 can be considered the projection plane of the first diaphragm 332 and the second diaphragm 342.

[0084] In some embodiments, it is provided that the plane of the surface of the first magnet 331 facing the first membrane 332 can be determined using a three-dimensional model of the acoustic output device, so that an orthogonal projection onto this plane is carried out in order to determine the positional relationship between the orthogonal projection of the first magnet 331 and the orthogonal projection of the second magnet 341.

[0085] It will be on Fig. 4. In some embodiments, the first diaphragm 332 can comprise a main area 3321 and a surround area 3322 that surrounds the main area 3321. The main area 3321 is rigidly connected to the first loudspeaker 330 via the surround area 3322. In some embodiments, the main area 3321 can comprise a domed dome 3321c. The domed dome 3321c projects towards the side away from the first magnet 331. Furthermore, the domed dome 3321c exhibits high strength and stiffness, which to some extent suppresses the partial vibrations of the main area 3321 and thereby improves the vibration characteristics of the first loudspeaker 330.

[0086] In some embodiments, the dome 3321c can be directly connected to the corrugated region 3322. The corrugated region 3322 can, for example, comprise an inner edge located close to the dome 3321c and an outer edge located far from the dome 3321c, with the dome 3321c being directly connected to the inner edge. In some embodiments, the dome 3321c can be indirectly connected to the corrugated region 3322. For example, the main region 3321 can further comprise a first inclined segment 3321a and a first connecting segment 3321b. The first inclined segment 3321a connects the main region 3321 to the corrugated region 3322. The first connecting segment 3321b connects the first inclined segment 3321a to the dome 3321c.The first connecting segment 3321b serves to connect the first coil 333 and extends in a direction perpendicular to the vibration direction of the first diaphragm 332. The first inclined segment 3321a rests against a portion of the surround area 3322. The first coil 333 is located beneath the first connecting segment 3321b, and the first inclined segment 3321a tilts relative to the first connecting segment 3321b away from the first coil 333. This prevents the adhesive used to bond the first coil 333 to the first diaphragm 332 from seeping into the surround area 3322 and thus corroding it, which could impair the vibration characteristics of the first diaphragm 332.

[0087] In some embodiments, the projection of the center of the second magnet 341 of the second loudspeaker 340 onto the first diaphragm 332 can be located, in its axial direction, between the center of the dome 3321c and the inner edge of the surround area 3322. The center of the dome 3321c can refer to the centroid of the dome 3321c. For example, the center of the dome 3321c can be located at the highest point on the dome 3321c, i.e., at the point on the dome 3321c furthest from the first magnet 331. By adjusting the relative position of the first magnet 331 to the second magnet 341 perpendicular to the direction of vibration of the diaphragm (i.e.,By positioning the projection of the center of the second magnet 341 onto the first diaphragm 332 in its axial direction between the center of the dome 3321c and the inner edge of the surround area 3322, mutual reinforcement between the first and second magnetic fields can be ensured, thereby increasing the radiated sound pressure levels of the two loudspeakers. Furthermore, since both the central area of ​​the dome 3321c and the surround area 3322 are relatively elevated areas on the first diaphragm 322, the second loudspeaker 340 can be offset relative to these two elevated areas (namely, the center of the dome 3321c and the surround area 3322) by adjusting the projection of the center of the second magnet 341 onto the first diaphragm 332 in its axial direction between the center of the dome 3321c and the inner edge of the surround area 3322.This contributes to reducing the distance between the first loudspeaker 330 and the second loudspeaker 340, thereby reducing the overall dimensions of the acoustic output device 300. This arrangement also prevents the first diaphragm (in particular the dome 3321c) from colliding with the second loudspeaker during vibration.

[0088] In some embodiments, a magnetic circuit system containing the first magnet 331 is provided to have a first distance, in the direction of vibration of the first diaphragm 332, from the magnetic circuit system containing the second magnet 341. The magnetic circuit system mentioned here can be the magnetic circuit arrangement described above. The first distance refers to a distance between the bottom of the magnetic circuit system of the second loudspeaker 340 facing away from the second diaphragm 342 (e.g., the surface of the second magnet 341 facing away from the second diaphragm 342) and the top of the magnetic circuit system of the first loudspeaker 330 (e.g., the surface of a magnetically conductive plate in the magnetic circuit arrangement facing the first diaphragm 332).

[0089] In some embodiments, the first distance can be greater than 2.85 mm to ensure that the second loudspeaker 340 does not collide with the first diaphragm 332 during vibration. In some embodiments, the first distance can be less than 3.42 mm to ensure that the acoustic output device 300 does not become excessively large. In some embodiments, the first distance can be between 2.85 mm and 3.42 mm to accommodate both the vibration of the first diaphragm and the dimensions of the acoustic output device. In some embodiments, the first distance is designed to influence the coupling between the first magnetic field generated by the first loudspeaker 330 and the second magnetic field generated by the second loudspeaker 340.By adjusting the first distance within a suitable range, it can be ensured that the first and second magnetic fields can reinforce each other, thereby increasing the radiated sound pressure levels of the two loudspeakers. In some embodiments, the first distance can be between 3 mm and 3.2 mm to ensure that the first and second magnetic fields can reinforce each other and thus increase the radiated sound pressure levels of the two loudspeakers. At the same time, this ensures the stability of the vibration of the first diaphragm 332.

[0090] In some embodiments, the first magnet 331 is provided to have a second distance to the second magnet 341 in the direction of vibration of the first diaphragm 332. This second distance can, for example, refer to a distance between the base of the second magnet 341 (i.e., a side of the second magnet 341 facing away from the second diaphragm 342) and the top of the first magnet 331 (i.e., a side of the first magnet 331 facing the first diaphragm 332).

[0091] In some embodiments, the second distance is designed to influence the coupling between the first magnetic field generated by the first loudspeaker 330 and the second magnetic field generated by the second loudspeaker 340. By adjusting the second distance within a suitable range, it can be ensured that the first and second magnetic fields can reinforce each other, thereby increasing the radiated sound pressure levels of the two loudspeakers. In some embodiments, the second distance can be between 3.06 mm and 4.58 mm to ensure that the first and second magnetic fields can reinforce each other and increase the radiated sound pressure levels of the two loudspeakers. In some embodiments, the second distance can be between 3.6 mm and 4.0 mm. In some embodiments, the second distance can be between 3.80 mm and 3.85 mm.

[0092] In some embodiments, the relative position of the first loudspeaker 330 to the second loudspeaker 340 in the horizontal direction (i.e., in the direction perpendicular to the direction of oscillation) could influence the coupling between the first magnetic field and the second magnetic field, thus affecting the magnetic induction strength at the first coil of the first loudspeaker 330 and at the second coil of the second loudspeaker 340, respectively. Fig. Figure 7A shows a schematic representation of various relative positions of the first loudspeaker to the second loudspeaker in the horizontal direction according to some embodiments of the present description. Fig. Figure 7B shows a schematic representation of a magnetic field distribution of the first loudspeaker and the second loudspeaker according to some embodiments of the present description. Fig. Figure 7C shows a representation of a change trend of a magnetic induction strength at the endpoint of a first coil of the first loudspeaker at the different relative positions of the first loudspeaker to the second loudspeaker in the horizontal direction according to some embodiments of the present description. Fig. Figure 7D shows a representation of a change trend in the average magnetic induction strength at the first coil according to some embodiments described in this document. It should be noted that the second loudspeaker 340, as in Fig. 7A, Fig. 7B, Fig. 7C and Fig. 7D schematically depicted, in an embodiment with two magnets (i.e. including the second magnet 341 and a third magnet 343), the details of the embodiment with two magnets being given in the accompanying description of Fig. 8. Regardless of whether the second loudspeaker 340 is configured as a structure with a single magnet (i.e., only with the second magnet 341) or in the configuration with two magnets, similar conclusions can be drawn regarding the relative position of the first loudspeaker 330 to the second loudspeaker 340 in the horizontal direction. In Figure (a) of Fig. Figure 7A shows a positional relationship in which the second loudspeaker 340 is located on the outside of the first loudspeaker 330 in the direction perpendicular to the direction of vibration of the first diaphragm 332, provided that the distance between the second loudspeaker 340 and the first loudspeaker 330 remains unchanged in the direction of vibration of the first diaphragm 332, as shown in Fig. 7A is shown. In Figure (a) of Fig. 7A has a first end 3301 at the first loudspeaker 330 and a second end 3401 at the second loudspeaker 340 at a distance of 0. The first end 3301 is the end of the first loudspeaker 330 that is closest to the second loudspeaker 340. Likewise, the second end 3401 is the end of the second loudspeaker 340 that is closest to the first loudspeaker 330. At this point, the projections of the second loudspeaker 340 and the first loudspeaker 330 do not overlap on the reference plane perpendicular to the direction of vibration of the first diaphragm 332. This can be understood as the case in which the movement distance of the second loudspeaker is 0 mm, as in Fig. 7C is shown. In Figure (b) of Fig. Figure 7A shows a positional relationship along the reference plane perpendicular to the direction of vibration of the first diaphragm 332, where the second loudspeaker 340 is directly opposite the center of the first loudspeaker 330. At this point, the distance between the first end 3301 and the second end 3401 increases. In conjunction with Fig. As shown in Figures 7A to 7C, when the second loudspeaker 340 is positioned on the outside of the first loudspeaker 330, the direction of the magnetic flux lines from the side magnet of the second loudspeaker 340 (i.e., the third magnet 343) is opposite to the direction of the magnetic flux lines of the first magnetic field generated by the first loudspeaker 330 at the endpoint of the first coil. Therefore, as the second loudspeaker 340 moves toward the central position of the first loudspeaker 330, the magnetic induction strength at the endpoint of the first coil of the first loudspeaker 330 decreases. As the second loudspeaker 340 continues to move, the direction of the side magnet of the second loudspeaker 340 at the first coil of the first loudspeaker 330 becomes opposite to its original direction. Therefore, as the distance of movement of the second loudspeaker 340 increases, the magnetic induction strength at the endpoint of the first coil also increases.When the second loudspeaker 340 moves into a position directly opposite the center of the first loudspeaker 330, the maximum average magnetic induction strength is achieved at the first coil.

[0093] See Fig. 7D. In Fig. Figure 7D shows the relationship between the average magnetic induction strength at the first coil and the horizontal movement distance of the second loudspeaker 340. The abscissa represents the movement distance d of the second loudspeaker 340 in mm, while the ordinate represents the average magnetic induction strength at the first coil in T. The movement of the second loudspeaker 340 can be described, for example, by moving it from position (a) to position (b). Fig. Figure 7A illustrates this. If the movement distance of the second loudspeaker 340 is less than approximately 4 mm, the average magnetic induction strength at the first coil shows no significant change. This is because the second loudspeaker 340 generates two opposing magnetic fields in the horizontal direction (see Figure 7A). Fig. 7B), where both influence the magnetic induction strength at the endpoints of the first coil. If the movement distance of the second loudspeaker 340 is small, the effects of the two magnetic fields are essentially identical and therefore cancel each other out, so that the average magnetic induction strength at the first coil remains largely unchanged. If the second loudspeaker 340 moves over a greater distance (more than 4 mm), it approaches the center of the first loudspeaker 330. The lateral magnet of the second loudspeaker 340 thus reinforces the magnetic field at the first coil. This results in an accelerated growth rate of the average magnetic induction strength at the first coil, as well as an increased growth amplitude.

[0094] It should be noted that, in principle, if the second loudspeaker 340 is located in the center of the first loudspeaker 330, the average magnetic induction strength at the first coil is maximized. However, considering factors such as the dimensions of the acoustic output device 300, the distance between the second sound outlet of the second loudspeaker 340 and the ear canal opening, and the magnetic field strength, in practice the position directly opposite the center of the first loudspeaker 330 may not be the optimal location for the second loudspeaker 340. In the Fig. The structure shown in Figure 6A and the supported state is, for example, the position directly opposite the center of the first loudspeaker 330, as shown in Figure (b) of Fig. 7A is shown, it is relatively far from the ear canal opening and there is a risk that it will be covered by the tragus.

[0095] In some embodiments, it is provided that in the plane of the surface of the first magnet 331 facing the first diaphragm 332, the distance between the orthogonal projection of the centroid of the first diaphragm 332 and the orthogonal projection of the centroid of the second diaphragm 342 can serve to characterize the relative position of the first loudspeaker 330 to the second loudspeaker 340 in the horizontal direction.In conjunction with the above description, in the plane of the surface of the first magnet 331 facing the first diaphragm 332, the distance between the orthogonal projection of the centroid of the first diaphragm 332 and the orthogonal projection of the centroid of the second diaphragm 342 can be between 0 mm and 8 mm to take into account the average magnetic induction strength at the first coil, the dimensions of the acoustic output device 300 and the distance between the second sound outlet of the second loudspeaker 340 and the ear canal opening.

[0096] Fig. Figure 8 shows an exemplary structural representation of the second loudspeaker according to some embodiments described in this document. As in Fig. As shown in Figure 8, in some embodiments the second loudspeaker 340 may further comprise a third magnet 343, wherein the third magnet 343 is arranged around the second magnet 341. The third magnet 343 may, for example, be a ring magnet arranged around the circumference of the second magnet 341.

[0097] In some embodiments, the magnetic poles of the third magnet 343 and the second magnet 341, which have the same poles, can be adjusted so that they are opposite to each other. As in Fig. As shown in Figure 8, for example, the N-pole of the second magnet 341 is oriented towards the second diaphragm 342, while the S-pole of the third magnet 343 is oriented towards the second diaphragm 342. In this arrangement, the magnetic field generated by the third magnet 343 can, on the one hand, increase the magnetic field strength at the second coil of the second loudspeaker 340. On the other hand, more magnetic flux lines emitted by the N-pole of the second magnet 341 can be received by the S-pole of the third magnet 343. That is, the third magnet 343 can increase the magnetic field strength of the second magnet 341 at the second coil.

[0098] Fig. Figure 9 shows another exemplary structural representation of the second loudspeaker according to some embodiments of the present description. As in Fig. As shown in Figure 9, in some embodiments the second loudspeaker 340 may further comprise a fourth magnet 344, wherein the fourth magnet 344 and the second magnet 341 are arranged in the direction of vibration of the second diaphragm 342, and wherein the fourth magnet 344 and the second magnet 341 have the same magnetic poles, which are arranged opposite each other. As shown in Fig. As shown in Figure 9, the N-pole of the fourth magnet 344 and the N-pole of the second magnet 341 are arranged opposite each other. In this arrangement, more magnetic flux lines can pass perpendicularly through the second coil, thereby increasing the magnetic induction strength at the second coil and suppressing magnetic leakage, thus improving the sensitivity of the second loudspeaker 340. It should be noted that when the second loudspeaker 340 includes a fourth magnet 344, the design of its second magnet 341 and its third magnet 343 (e.g., the diameter of the magnets) remains identical to the design in which the second loudspeaker 340 includes only the second magnet 341 and the third magnet 343.

[0099] Fig. Figure 10 shows a diagram of sound pressure level curves of the second loudspeaker in an embodiment with two magnets or three magnets according to some embodiments described in this document. The embodiment with two magnets refers to an embodiment in which the second loudspeaker 340 comprises two magnets. For example, the second loudspeaker 340 comprises, as above in Fig. Figure 8 shows the second magnet 341 and the third magnet 343. The three-magnet configuration refers to an embodiment in which the second loudspeaker 340 comprises three magnets. For example, the second loudspeaker 340 comprises, as shown above in Fig. Figure 9 shows the second magnet 341, the third magnet 343, and the fourth magnet 344. The abscissa is in Fig. 10 represents the frequency in Hz, and the ordinate represents the sound pressure level in dB. Curve 1010 represents the sound pressure level curve for the second loudspeaker in a configuration with two magnets, i.e., the second magnet and the third magnet. Curve 1020 represents the sound pressure level curve for the second loudspeaker in a configuration with three magnets, i.e., the second magnet, the third magnet, and the fourth magnet. As shown from Fig. As can be seen in Figure 10, the second loudspeaker in the configuration with three magnets exhibits higher sensitivity across the entire frequency range than the second loudspeaker in the configuration with two magnets. The sensitivity of the second loudspeaker in the configuration with three magnets is approximately 6 dB higher than that of the second loudspeaker in the configuration with two magnets. That is, compared to the case where the fourth magnet 344 is not provided (i.e., compared to the configuration with two magnets), the arrangement of the fourth magnet 344 as described above (i.e., by providing the configuration with three magnets) allows more magnetic flux lines to pass perpendicularly through the second coil, thereby increasing the magnetic induction strength at the second coil and suppressing magnetic leakage, thus improving the sensitivity of the second loudspeaker.

[0100] If the same magnetic poles of the first magnet 331 of the first loudspeaker 330 and the second magnet 341 of the second loudspeaker 340 are arranged opposite each other, and the third magnet 343 is arranged around the second magnet 341, then in some embodiments the magnetic induction strength at the first coil of the first loudspeaker 330 can be increased by the magnetic field generated by the second magnet 341, while it is decreased by the magnetic field generated by the third magnet 343. Since the second magnet 341 and the third magnet 343 exert opposite effects on the magnetic induction strength at the first coil, it is therefore necessary to design the dimensions of the second magnet 341 and the third magnet 343 appropriately.This ensures that the second loudspeaker 340 maintains its own output power while simultaneously allowing the magnetic induction strength at the first coil to be amplified by a combined magnetic field of the second loudspeaker 340, which is obtained, for example, by coupling the magnetic field generated by the second magnet 341 with the magnetic field generated by the third magnet 343. In this embodiment, the dimensions of each magnet can be characterized by the area of ​​its cross-section perpendicular to its axis. For the sake of simplicity, the ratio of the cross-sectional area of ​​the second magnet 341 in its axis to the cross-sectional area of ​​the third magnet 343 in its axis is hereby simply referred to as the area ratio between the second and third magnets.

[0101] Fig. Figure 11A shows a schematic structural representation of a second magnet and a third magnet according to some embodiments of the present description. Fig. Figure 11B shows a schematic structural representation of a second magnet and a third magnet according to some other embodiments of the present description. Fig. In 11A, the ratio of the cross-sectional area of ​​the second magnet 341 in its axial direction to the cross-sectional area of ​​the third magnet 343 in its axial direction is 0.1. Fig. 11B the ratio of the area of ​​the cross-section of the second magnet 341 in its axial direction to the area of ​​the cross-section of the third magnet 343 in its axial direction is 4. Fig. Figure 11C shows a diagram illustrating results regarding the effect of the area ratio of the second magnet 341 to the third magnet 343 on the magnetic induction strength at the first coil according to some embodiments described in this document. The abscissa represents the area ratio of the second magnet 341 to the third magnet 343, and the ordinate represents the magnetic induction strength at the first coil. As shown in Fig. As can be seen in Figure 11C, the magnetic induction strength at the first coil increases with the increasing area ratio of the second magnet 341 to the third magnet 343. Based on this, in some embodiments, the ratio of the cross-sectional area of ​​the second magnet 341 in its axial direction to the cross-sectional area of ​​the third magnet 343 in its axial direction can be in the range of 0.1 to 4 in order to increase the magnetic induction strength at the first coil and thereby the sound pressure level of the sound emitted by the first loudspeaker 330.

[0102] In some embodiments, it is provided that the ratio of the cross-sectional area of ​​the second magnet 341 in the direction perpendicular to the axis of the second magnet 341 to the cross-sectional area of ​​the third magnet 343 in the direction perpendicular to the axial direction of the third magnet 343 can be in the range of 0.4 to 0.6 in order to ensure the performance of the second loudspeaker 340.

[0103] In some embodiments, the magnetic induction strength at any point in the first coil of the first loudspeaker 330 is greater than 0.45 T. Furthermore, the magnetic induction strength at any point in the second coil of the second loudspeaker 340 is greater than 0.3 T. This allows both the sound emitted by the first loudspeaker 330 and the sound emitted by the second loudspeaker 340 to have a high sound pressure level, thus improving the perceived loudness for the user. In some embodiments, the magnetic induction strength at any point in the first coil of the first loudspeaker 330 is greater than 0.56 T to further increase the sound pressure level of the sound emitted by the first loudspeaker 330 and the sound emitted by the second loudspeaker 340.Furthermore, the value of the magnetic induction strength at any point in the second coil of the second loudspeaker 340 is greater than 0.54 T.

[0104] Fig. Figure 12 shows a further structural representation of the acoustic output device according to some embodiments described in this document. As in Fig. As shown in Figure 12, an acoustic output device 1200 comprises a housing, a support structure, a first loudspeaker 1230, and a second loudspeaker 1240. The housing and support structure of the acoustic output device 1200 are essentially identical to the housing 310 and support structure 320, respectively, of the acoustic output device 300. The structure and acoustic principle of the first loudspeaker 1230 and the second loudspeaker 1240 of the acoustic output device 1200 are also essentially identical to those of the first loudspeaker 330 and the second loudspeaker 340 of the acoustic output device 300. For example, the first loudspeaker 1230 comprises a first magnet 1231 and a first diaphragm, wherein the first magnet 1231 is spaced apart from the first diaphragm in a direction of vibration of the first diaphragm (such as the first direction of vibration shown in the figure).The second loudspeaker 1240 comprises a second magnet 1241 and a second diaphragm, wherein the second magnet 1241 is spaced apart from the second diaphragm in one direction of vibration of the second diaphragm (such as the second direction of vibration shown in the figure). Similarly, the first loudspeaker 1230 comprises a first coil connected to the first diaphragm and located at least partially within a magnetic field formed by the first magnet 1231, wherein, when energized, the first coil causes the first diaphragm to vibrate in order to produce sound. The second loudspeaker 1240 comprises a second coil connected to the second diaphragm and located at least partially within a magnetic field formed by the second magnet 1241, wherein, when energized, the second coil causes the second diaphragm to vibrate in order to produce sound.The difference is that within the acoustic output device 1200 the axis of the second magnet 1241 is inclined relative to the axis of the first magnet 1231.

[0105] The axis a1 of the first magnet 1231 is inclined relative to the axis a2 of the second magnet 1241, such that an angle greater than 0° is enclosed between the axis a1 of the first magnet 1231 and the axis a2 of the second magnet 1241. For example, the angle between the axis a1 of the first magnet 1231 and the axis a2 of the second magnet 1241 can be 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, etc. With reference to Fig. In some embodiments, the second loudspeaker 1240 can be arranged on the outer surface of the first loudspeaker 1230. In this case, the angle between the axis a1 of the first magnet 1231 and the axis a2 of the second magnet 1241 can be 90°. For example, the base of the magnetic circuit assembly of the second loudspeaker 1240 is oriented towards the side wall of the magnetic circuit assembly of the first loudspeaker 1230. The base of the magnetic circuit assembly of the second loudspeaker 1240 can, for example, be a surface of the second magnet facing away from the second diaphragm. The side wall of the magnetic circuit assembly of the first loudspeaker 1230 can be a side wall of the receiving element. As already mentioned, the direction of vibration of the first diaphragm is parallel to the axis of the first magnet 1231, and the direction of vibration of the second diaphragm is parallel to the axis of the second magnet 1241.Therefore, the direction of vibration of the first diaphragm is inclined relative to the direction of vibration of the second diaphragm if the axis a1 of the first magnet 1231 is inclined relative to the axis a2 of the second magnet 1241. By arranging the axis of the second magnet 1241 at an angle relative to the axis of the first magnet 1231, it can be advantageous to position the second sound outlet of the second loudspeaker 340 closer to the ear canal opening (for example, in the case described in...). Fig. 13A (carrying method shown below). This improves the audible volume of the high-frequency sound emitted by the second loudspeaker 340.

[0106] By arranging the axis of the second magnet 1241 at an angle relative to the axis of the first magnet 1231, the coupling effect between the second magnet 1241 and the first magnet 1231 is reduced, so that the magnetic field of the first coil of the first loudspeaker 1230 is less influenced overall by the second magnet 1241 of the second loudspeaker 1240.

[0107] In some embodiments, it is provided that in a plane in which a surface of the first magnet 1231 facing the first membrane is located, the orthogonal projection of the second membrane can be spaced apart from the orthogonal projection of the first membrane if the axis of the second magnet 1241 is arranged at an inclination relative to the axis of the first magnet 1231. That is, in the direction perpendicular to the direction of oscillation of the first membrane (e.g., in the horizontal direction). Fig. 12) The first diaphragm is spaced apart from the second diaphragm, with the first magnet 1231 also being spaced apart from the second magnet 1241. Since the second loudspeaker 1240 is located in Fig. Since the magnet 12 is located only on one side of the first loudspeaker 1230 and thus represents an asymmetrical arrangement, the coupling between the second magnet 1241 and the first magnet 1231 can be further reduced by arranging the first magnet 1231 and the second magnet 1241 at an angle to each other and spaced apart. This results in a more uniform magnetic field distribution across the first coil of the first loudspeaker 1230, thereby preventing unstable oscillations of the first coil due to magnetic field instability.

[0108] If the axis of the second magnet 1241 is arranged at an angle relative to the axis of the first magnet 1231, the orthogonal projection of the second diaphragm can, in some further embodiments, at least partially overlap with the orthogonal projection of the first diaphragm, thereby ensuring a smaller volume of the acoustic output device 1200. If higher volume requirements are placed on the acoustic output device 1200, adjusting the relative positions of the first diaphragm (of the first magnet 1231) and the second diaphragm (of the second magnet 1241) in the manner described in this embodiment can be considered.

[0109] In some embodiments, the sound emitted by the first loudspeaker 1230 has a lower frequency, at least in part, than the sound emitted by the second loudspeaker 1240. Analogous to the types of the first loudspeaker 330 and the second loudspeaker 340 of the acoustic output device 300, the first loudspeaker 1230 of the acoustic output device 1200 is a low-frequency or low- to mid-frequency loudspeaker, while the second loudspeaker 1240 is a high-frequency loudspeaker. In some embodiments, there may be no overlap between the frequency range of the first sound emitted by the first loudspeaker 1230 and the frequency range of the second sound emitted by the second loudspeaker 1240. For example, the minimum frequency in the frequency range of the second sound is higher than the maximum frequency in the frequency range of the first sound.In some embodiments, there may be an overlap between the frequency range of the first sound emitted by the first loudspeaker 1230 and the frequency range of the second sound emitted by the second loudspeaker 1240. For example, the minimum frequency in the frequency range of the second sound is lower than the maximum frequency in the frequency range of the first sound, and the maximum frequency in the frequency range of the second sound is higher than the maximum frequency in the frequency range of the first sound. Further details regarding the low-frequency loudspeaker and the high-frequency loudspeaker can be found in the corresponding description above, which will not be repeated here.

[0110] In some embodiments, the housing of the acoustic output device 1200 may have a different mounting method than the housing 310 of the acoustic output device 300, which projects into the caveum conchae. Fig. Figure 13A shows a schematic representation of another way of wearing the acoustic output device according to some embodiments described in this document. As in Fig. As shown in Figure 13A, when worn, the housing 1210 can be positioned on the antihelix of the ear using the support structure 1220 of the acoustic output device 1200, with one side surface of the housing 1210 partially resting against the antihelix. By positioning the housing 1210 at least partially against the antihelix of the ear, the output effect of the acoustic output device 1200 can be improved. That is, the sound intensity at a listening position in the near field is increased, and the volume of sound loss in the far field is simultaneously reduced. When the user wears the acoustic output device 1200, one or more sound outlet openings can be provided on the side of the housing 1210 facing the user's ear canal or adjacent to it. On other side walls of the housing 1210 (e.g.,(the side wall facing away from or far from the user's ear canal) may have one or more pressure relief openings. For example, if housing 1210 has only one sound outlet opening, the first loudspeaker 1230 and the second loudspeaker 1240 share this opening. If, for example, housing 1210 has two sound outlet openings, one opening is used for high-frequency sound and the other for low-frequency or low- to mid-frequency sound. Furthermore, if housing 1210 has more than two sound outlet openings, some are used for high-frequency sound and some for low-frequency or low- to mid-frequency sound. For example, housing 1210 has one sound outlet opening and one...The sound outlet opening is acoustically coupled to the front chamber of the acoustic output device 1200, while the pressure relief opening is acoustically coupled to the rear chamber of the acoustic output device 1200. The sound emitted from the sound outlet opening and the sound emitted from the pressure relief opening can be approximated as two sound sources, with the two sound sources having equally loud sounds with opposite phases. While the sound emitted from the sound outlet opening can be transmitted directly and unimpeded to the user's ear canal opening, the sound emitted from the pressure relief opening must either bypass or pass through the housing 1210 to form an acoustic model corresponding to that described in [reference]. Fig. resembles the one shown in 13B. As in Fig. As shown in Figure 13B, a baffle is provided between point sound source A1 and point sound source A2. The sound field of point sound source A2 must first pass by the baffle in the near field before it can interfere with the sound wave of 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.

[0111] Since the 1210 case is also used in the Fig. Since the wearing method shown in Figure 13A does not block the ear canal opening and provides a relatively high audible volume, the overall dimensions of the acoustic output device 1200 can be reduced by decreasing the size between the two loudspeakers in this wearing method. This allows the acoustic output device 1200 to achieve a more powerful listening effect while simultaneously improving wearing comfort. This is because, compared to the stacked arrangement of the two loudspeakers in the acoustic output device 300, the dimensions of the acoustic output device 1200 in the direction of vibration of the first diaphragm (also referred to as the thickness dimension of the acoustic output device 1200) can be reduced by the arrangement of the two loudspeakers in the acoustic output device 1200. In conjunction with the Fig. The wearing method shown in Figure 13A is made possible by reducing the thickness of the acoustic output device 1200, which allows its center of mass to shift closer to the antihelix. This prevents deflection of the acoustic output device 1200 due to gravity, thus improving wearing stability and ensuring the hearing effect.

[0112] At the in Fig. In the wearing position shown in Figure 13A, the housing 1210 of the acoustic output device 1200 is located on the antihelix. In this case, the inside of the housing 1210 faces the user's ear, and the underside of the housing 1210 is a side surface of the housing 1210 facing away from the top of the user's head. Compared to the other side surfaces of the housing 1210, the underside of the housing 1210 is closer to the ear canal opening.

[0113] In some embodiments, a first sound outlet opening and a second sound outlet opening can be provided in the underside of the housing 1210 of the acoustic output device 1200. The first sound outlet opening is acoustically coupled to the first diaphragm, so that sound generated by the first diaphragm is radiated outwards through the first sound outlet opening. The second sound outlet opening is acoustically coupled to the second diaphragm, so that sound generated by the second diaphragm is radiated outwards through the second sound outlet opening. When worn in a position where the housing 1210 of the acoustic output device 1200 rests against the antihelix, the first and second sound outlet openings can be positioned closer to the ear canal opening on the underside of the housing 1210.In particular, a reduction in the propagation distance of the sound emitted by the second loudspeaker is achieved, which can improve the audible effect of the acoustic output device 1200.

[0114] In some embodiments, the second sound outlet, when worn, may be located closer to the ear canal opening than the first sound outlet; that is, the sound outlet corresponding to the high-frequency loudspeaker is located closer to the ear canal opening. By way of example only, when worn, an orthogonal projection of the centroid of the second sound outlet onto the sagittal plane of the human body is located closer to the ear canal opening than an orthogonal projection of the centroid of the first sound outlet onto the sagittal plane of the human body.In view of the strong directional effect of the high-frequency sound emitted by the second loudspeaker 1240, the arrangement in which the second sound outlet opening is provided closer to the ear canal opening can further increase the audible volume of the high-frequency sound emitted by the second loudspeaker 1240 and thus improve the sound effect of the acoustic output device 1200.

[0115] In some embodiments, the first sound outlet opening and the second sound outlet opening can be provided in different side surfaces of the housing 1210. In some embodiments, the first sound outlet opening can be provided on the inside of the housing 1210 and the second sound outlet opening on the underside of the housing 1210. In the worn state, as shown in Fig. As shown in Figure 13A, the second sound outlet of the second loudspeaker 1240 is located in the underside of the housing 1210, allowing the second sound outlet to be positioned closer to the ear canal opening. This results in a more directivity of the sound emitted by the second loudspeaker 1240, further improving the acoustic performance of the acoustic output device 1200. Furthermore, the housing 1210 may also include a pressure relief opening, which is acoustically coupled to the first diaphragm. In some embodiments, the pressure relief opening may be located in the underside or top of the housing 1210. In other embodiments, the pressure relief opening may also be located in other side surfaces of the housing 1210, which is not explicitly restricted in this description.

[0116] In some embodiments, the second sound outlet opening can be located in a connecting surface of the housing. The connecting surface refers to a surface of the housing that connects the underside to the inside. Since, in the worn state, as in Fig. As shown in Figure 13A, the underside of the housing 1210 faces away from the top of the user's head and the inside of the housing 1210 faces the antihelix. The connecting surface between the underside and the inside allows the second sound outlet to be directed more effectively towards the ear canal opening. This results in a more directivity of the sound emitted by the second loudspeaker 1240, further improving the acoustic output of the acoustic output device 1200.

[0117] In some embodiments, the axis of the first magnet 1231 is perpendicular to the axis of the second magnet 1241. That is, there is no radii between the axis a1 of the first magnet 1231 and the axis a2 of the second magnet 1241. Fig. In this case, an angle of 90° is included. The direction of vibration of the first diaphragm is perpendicular to the direction of vibration of the second diaphragm. The first magnet 1231 and the second magnet 1241 are spaced apart from each other in the direction of vibration of the second diaphragm. In other embodiments, the second magnet 1241 can also be spaced apart from the first magnet 1231 in a different direction. This other direction forms an angle with the axis of the first magnet 1231 (or the axis of the second magnet 1241), which is, for example, 10°, 20°, 30°, 40°, 50°, 60°, etc. In some other embodiments, the angle between the axis a2 of the second magnet 1241 and the axis a1 of the first magnet 1231 can be in the range of 10° to 45°.

[0118] In some embodiments, the N-pole of the first magnet 1231 can be oriented towards the first diaphragm and simultaneously the N-pole of the second magnet 1241 can be oriented towards the first magnet 1231, provided that the axis a1 of the first magnet 1231 is arranged at a specific angle to the axis a2 of the second magnet 1241. If the S-pole of the first magnet 1231 is oriented towards the first diaphragm and the S-pole of the second magnet 1241 is oriented towards the first magnet 1231, a third arrangement of the magnets is optionally provided in some embodiments such that the N-pole of the first magnet 1231 is oriented towards the first diaphragm and the S-pole of the second magnet 1241 is oriented towards the first magnet 1231. Optionally, a fourth arrangement of the magnets is provided such that the S-pole of the first magnet 1231 is oriented towards the first diaphragm and the N-pole of the second magnet 1241 is oriented towards the first magnet 1231.

[0119] Fig. Figure 14 shows a schematic representation of a magnetic field distribution of the first loudspeaker and the second loudspeaker according to some embodiments of the present description. The N-pole of the first magnet 1231 is oriented towards the first diaphragm, and the N-pole of the second magnet 1241 is oriented towards the first magnet 1231. Fig. Figure 15 shows a schematic representation of a magnetic field distribution of the first loudspeaker and the second loudspeaker according to some other embodiments described in this document. The N-pole of the first magnet 1231 is oriented towards the first diaphragm, and the S-pole of the second magnet 1241 is oriented towards the first magnet 1231. In conjunction with Fig. 14 and Fig. 15 It is provided that, when the magnetic field generated by the second loudspeaker 1240 is coupled with the magnetic field generated by the first loudspeaker 1230, based on the magnetic flux line distribution of the two magnets at the N-pole of the first magnet 1231 facing the first diaphragm compared to the S-pole of the second magnet facing the first magnet 1231 (as in Fig. (as shown in Figure 15) the overall magnetic induction strength at the second coil of the second loudspeaker 1240 increases when the N-pole of the second magnet is aligned with the first magnet 1231 (as shown in Figure 15). Fig. 14 shown).

[0120] In some embodiments, a magnetic circuit containing the first magnet 1231 is provided to have a third distance from the magnetic circuit containing the second magnet 1241. This third distance refers to the shortest distance between the magnetic circuit containing the first magnet 1231 and the magnetic circuit containing the second magnet 1241. If the axis of the first magnet 1231 is perpendicular to the axis of the second magnet 1241, the third distance can, for example, refer to the shortest distance between the bottom of the magnetic circuit of the second loudspeaker 1240 (e.g., the surface of the magnetically conductive element / receiving element facing away from the second diaphragm) and the side wall of the receiving element of the magnetic circuit arrangement of the first loudspeaker 1230 in the direction of vibration of the second diaphragm.

[0121] In some embodiments, the third distance may be greater than 1.5 mm to ensure that the first loudspeaker 1230 does not influence the vibration of the second diaphragm. In some embodiments, the first distance may be less than 2.5 mm to ensure that the acoustic output device 1200 does not become excessively large. In some embodiments, the third distance may affect the coupling between the first magnetic field generated by the first loudspeaker 1230 and the second magnetic field generated by the second loudspeaker 1240. In some embodiments, the third distance may be between 1.7 mm and 2.3 mm. In some embodiments, the third distance may be between 1.9 mm and 2.1 mm.

[0122] In some embodiments, the inner chamber of the housing 1210 may comprise a first chamber and a second chamber, which are separate from each other, with the first loudspeaker 1230 being housed in the first chamber and the second loudspeaker 1240 being housed in the second chamber. In some embodiments, a partition plate may be formed in the housing 1210, which divides the inner chamber of the housing 1210 into a first chamber for housing the first loudspeaker 330 and a second chamber for housing the second loudspeaker 340. In this case, the first diaphragm of the first loudspeaker 1230 divides the first chamber into a first front chamber and a first rear chamber.The first front chamber is acoustically coupled to the first sound outlet, so that sound generated by the first front chamber of the first loudspeaker 1230 is radiated outwards through the first sound outlet. The second chamber is divided into a second front chamber and a second rear chamber by the second diaphragm of the second loudspeaker 1240. The second front chamber is acoustically coupled to the second sound outlet, so that sound generated by the second front chamber of the second loudspeaker 1240 is radiated outwards through the second sound outlet. In this arrangement, the first front chamber of the first loudspeaker 1230 is not in acoustic communication with the second front chamber of the second loudspeaker 1240. This means that the first loudspeaker 1230 and the second loudspeaker 1240 do not share a sound outlet.This ensures that the sound emitted by the first loudspeaker 1230 and the sound emitted by the second loudspeaker 1240 do not interfere with each other, thereby reducing the mutual radiation impedance.

[0123] Analogous to the arrangement in which the second loudspeaker 340 of the acoustic output device 300 comprises the third magnet 343, the second loudspeaker 1240 of the acoustic output device 1200 may further comprise a third magnet (not shown) arranged around the second magnet 1241. The third magnet may, for example, be a ring magnet arranged around the second magnet 1241.

[0124] In some embodiments, the magnetic poles of the third magnet and the second magnet 1241 can be arranged so that they are opposite to each other. With this arrangement, the magnetic field generated by the third magnet can, on the one hand, increase the magnetic field strength at the second coil of the second loudspeaker 1240. On the other hand, the third magnet can increase the magnetic field strength of the second magnet 1241 at the second coil.

[0125] Analogous to the arrangement in which the second loudspeaker 340 of the acoustic output device 300 comprises the fourth magnet 344, the second loudspeaker 1240 of the acoustic output device 1200 can further comprise a fourth magnet (not shown), wherein the fourth magnet and the second magnet 1241 are arranged in the direction of vibration of the second diaphragm, and wherein the fourth magnet and the second magnet 1241 have like magnetic poles arranged opposite each other. In this arrangement, more magnetic flux lines can pass perpendicularly through the second coil, thereby increasing the magnetic induction strength at the second coil and suppressing magnetic stray, thus improving the sensitivity of the second loudspeaker 1240.

[0126] When the third magnet is arranged around the second magnet 1241, in some embodiments the magnetic induction strength at the first coil of the first loudspeaker 1230 can be increased by the magnetic field generated by the second magnet 1241, while it is decreased by the magnetic field generated by the third magnet. Since the second magnet 1241 and the third magnet have opposing effects on the magnetic induction strength at the first coil, it is therefore necessary to design the dimensions of the second magnet 1241 and the third magnet appropriately. This ensures that the magnetic induction strength at the first coil can be increased by a combined magnetic field of the second loudspeaker 1240, which is obtained by coupling the magnetic field generated by the second magnet 1241 with the magnetic field generated by the third magnet.In this embodiment, the dimensions of each magnet can be characterized by the area of ​​its cross-section perpendicular to its axis. In some embodiments, the ratio of the cross-sectional area of ​​the second magnet 1241 in its axis to the cross-sectional area of ​​the third magnet in its axis can be in the range of 0.1 to 4 in order to increase the magnetic induction strength at the first coil and thereby the sound pressure level of the sound emitted by the first loudspeaker 1230.

[0127] In some embodiments, the ratio of the cross-sectional area of ​​the second magnet 1241 in the direction perpendicular to the axis of the second magnet to the cross-sectional area of ​​the third magnet in the direction perpendicular to the axial direction of the third magnet can be in the range of 0.4 to 0.6 to ensure the performance of the second loudspeaker 1240. Further details regarding the third and fourth magnets of the second loudspeaker 1240 can be found in the accompanying description above, e.g. Fig. 8, Fig. 9 to Fig. 10 and the accompanying description.

[0128] In some embodiments, the magnetic induction strength at any point in the first coil of the first loudspeaker 1230 is in the range of 0.44 T to 0.67 T. Furthermore, the magnetic induction strength at any point in the second coil of the second loudspeaker 1240 is in the range of 0.3 T to 0.6 T. This allows both the sound emitted by the first loudspeaker 330 and the sound emitted by the second loudspeaker 340 to have a high sound pressure level, thus improving the perceived loudness for the user. In some embodiments, the magnetic induction strength at any point in the first coil of the first loudspeaker 1230 is in the range of 0.549 T to 0.562 T to further increase the sound pressure level of the sound emitted by the first loudspeaker 1230 and the sound emitted by the second loudspeaker 1240.Furthermore, the value of the magnetic induction strength at any point on the second coil of the second loudspeaker 1240 lies in the range of 0.453 T to 0.472 T.

[0129] The basic concepts have already been described above. Obviously, the detailed disclosure given above is merely an example for those skilled in the art and does not constitute a limitation of the present application. Although not expressly stated here, those skilled in the art may make various modifications, improvements, and changes to the present application. These modifications, improvements, and changes are proposed in the present application and thus still fall within the spirit and scope of the exemplary embodiments of the present application.

[0130] The present application also uses specific terms to describe embodiments of the present application. The terms "an embodiment" and / or "some embodiments" refer to a feature, structure, or special characteristic associated with at least one embodiment of the present application. It should therefore be emphasized and noted that the terms "an embodiment" or "an alternative embodiment," which appear two or more times in different places in the present description, do not necessarily refer to the same embodiment. Furthermore, some features, structures, or properties of one or more embodiments of the present application can be appropriately combined with one another.

[0131] Furthermore, a person skilled in the art in this field can understand that the aspects of the present application can be explained and described by several categories or situations, including any new and meaningful combinations of operations, machines, products, or substances, as well as any new and meaningful improvements thereto. Accordingly, the various aspects of the present application can be implemented entirely by hardware, entirely by software (including firmware, resident software, microcode, etc.), or by a combination of hardware and software. Both hardware and software can be referred to as a "data block," "module," "engine," "unit," "component," or "system." Furthermore, the aspects of the present application can manifest themselves as a computer product on one or more computer-readable media, the product comprising computer-readable program code.

[0132] A computer storage medium can comprise a disseminated data signal containing computer program code, for example, on a baseband or as part of a carrier wave. This disseminated signal can be in various forms, including electromagnetic, optical, or a suitable combination thereof. A computer storage medium can be any computer-readable medium that is not a computer-readable storage medium in the strict sense and serves to achieve communication, dissemination, or transmission of a program to be provided by connecting it to an instruction execution system, associated device, or equipment. The program code on a computer storage medium can be disseminated via any suitable medium, such as radio, cable, fiber optic cable, RF, or similar media, or a combination thereof.

[0133] The computer program code required for the actions of various parts of this application may be written in one or more programming languages, including object-oriented programming languages ​​such as Java, Scala, Smalltalk, Eiffel, JADE, Emerald, C++, C#, VB.NET, Python, etc.; common procedural programming languages ​​such as C, Visual Basic, Fortran 2003, Perl, COBOL 2002, PHP, ABAP; dynamic programming languages ​​such as Python, Ruby, and Groovy; or other programming languages. The program code may be executed entirely on the user's computer, as an independent software package on the user's computer, partly on the user's computer and partly on a remote computer, or entirely on a remote computer or processing device.In the latter case, the remote computer can be connected to the user's computer via a network of any kind, such as a Local Area Network (LAN) or Wide Area Network (WAN), or (e.g., via the Internet) connected to an external computer, or in a cloud computing environment, or as a service such as Software-as-a-Service (SaaS).

[0134] Furthermore, unless expressly stated otherwise in the claims, neither the order of the processing elements and sequences nor the use of numbers, letters, or other designations in the present application shall be intended to restrict the order of the processes and procedures of the present application. Although the above disclosure has discussed some embodiments of the invention currently considered useful by way of various examples, it should be understood that such details are for illustrative purposes only and that the attached claims are not limited to the disclosed embodiments. Rather, the claims are intended to cover all modifications and equivalent combinations that are consistent with the nature and scope of the embodiments of the present application.For example, although the system components described above can be implemented by hardware devices, they can also be implemented by purely software solutions, such as installing the described system on existing processing equipment or mobile devices.

[0135] It should also be noted that in the preceding description of the embodiments of the present application, various features are sometimes grouped together in one embodiment, one figure, or its description(s) in order to simplify the description of the disclosure of the present application and to facilitate the understanding of one or more embodiments of the invention. However, this method of disclosure does not mean that the subject matter of the present application requires more features than those specified in the claims. In fact, the embodiments have fewer features than the totality of features of the individual embodiments disclosed above.

[0136] In some embodiments, numbers are used to describe the number of components and properties. It should be understood that in some cases, the numbers used to describe these embodiments are further specified by terms such as "approximately," "about," or "essentially." Unless otherwise stated, "approximately," "about," or "essentially" indicate that the stated number allows for a variation of ±20%. Accordingly, in some embodiments, the numerical parameters used in the description and claims are approximate values ​​that may vary depending on the requirements of the specific embodiment. In some embodiments, the required number of significant decimal places for the numerical parameters is to be taken into account using a general rounding procedure.Although the numerical ranges and parameters in some embodiments of the present application for determining the width of the associated perimeter are approximate values, such values ​​have been determined as precisely as possible within the practical scope in the specific embodiments.

[0137] Every patent specification, every patent application, every publication of patent applications, and every other material cited in the present application, such as articles, books, descriptions, publications, documents, etc., is hereby incorporated in its entirety into the present application as a reference. Excluded are application history documents that are inconsistent with or conflict with the content of the present application, as well as documents (currently or subsequently attached to the present application) that limit the broadest scope of the claims of the present application. It should be noted that in the event of any discrepancies or conflicts between the description, definition, and / or use of terms in the application and those in accompanying materials, the description, definition, and / or use of terms in the present application shall prevail.

[0138] In conclusion, it should be understood that the embodiments described in this application serve only to illustrate the principle of the embodiments described therein. Other variants could also fall within the scope of this application. Therefore, alternative configurations of the embodiments described in this application may be considered exemplary and not as limiting, as being consistent with the teachings of this application. Accordingly, the embodiments described in this application are not limited to those expressly presented and described herein.

Claims

[1] Acoustic output device, characterized by , that it includes: a housing in which an inner chamber is formed; a support structure that allows the housing to be held in a position on the ear without blocking the external ear canal; a first loudspeaker which is received in the inner chamber, wherein the first loudspeaker comprises a first magnet and a first diaphragm which are spaced apart from each other in a direction of vibration of the first diaphragm; and a second loudspeaker which is incorporated in the inner cannon, the second loudspeaker comprising a second magnet and a second diaphragm spaced apart from each other in a direction of vibration of the second diaphragm; wherein the first magnet and the second magnet are spaced apart from each other in the direction of oscillation of the first membrane, and wherein the first magnet and the second magnet have the same magnetic poles which are arranged opposite each other. [2] Acoustic output device according to claim 1, characterized by , that the sound emitted by the first loudspeaker has at least a partially lower frequency than the sound emitted by the second loudspeaker. [3] Acoustic output device according to claim 1 or 2, characterized by that the axis of the first magnet is arranged parallel and spaced apart from the axis of the second magnet. [4] Acoustic output device according to any one of claims 1 to 3, characterized by, that in a worn state, an orthogonal projection of the center of the second magnet onto the sagittal plane of the human body is closer to the ear canal opening than an orthogonal projection of the center of the first magnet onto the sagittal plane of the human body. [5] Acoustic output device according to any one of claims 1 to 4, characterized by , that in a plane in which a surface of the first magnet facing the first membrane is located, the orthogonal projections of the second magnet and the first magnet overlap at least partially. [6] Acoustic output device according to any one of claims 1 to 5, characterized by , that when worn the case protrudes at least partially into the caveum conchae of the ear and that a side surface of the case rests at least partially against the caveum conchae. [7] Acoustic output device according to any one of claims 1 to 6, characterized by, that the first membrane comprises a main area and a corrugated area surrounding the main area, wherein the main area comprises a domed dome, wherein a projection of the center of the second magnet onto the first membrane in an axial direction of the second magnet is located between the center of the dome and an inner edge of the corrugation, and wherein the inner edge of the corrugation is connected to the dome. [8] Acoustic output device according to any one of claims 1 to 3, characterized by , that in a plane in which a surface of the first magnet facing the first membrane is located, the distance between an orthogonal projection of the centroid of the first membrane and an orthogonal projection of the centroid of the second membrane is 0 mm to 8 mm. [9] Acoustic output device according to any one of claims 1 to 8, characterized by, that when worn, several sound outlet openings are provided on one side of the housing facing the external ear canal and several pressure relief openings are provided on other side walls of the housing. [10] Acoustic output device according to any one of claims 1 to 9, characterized by , that a magnetic circuit in which the first magnet is located has a first distance of 2.85 mm to 3.42 mm to the magnetic circuit in which the second magnet is located in the direction of oscillation of the first membrane. [11] Acoustic output device according to claim 1, characterized by , the second loudspeaker further comprises a third magnet arranged around the second magnet. [12] Acoustic output device, characterized by , that it includes: a housing in which an inner chamber is formed; a support structure that allows the housing to be held in a position on the ear without blocking the external ear canal; a first loudspeaker which is received in the inner chamber, wherein the first loudspeaker comprises a first magnet and a first diaphragm which are spaced apart from each other in a direction of vibration of the first diaphragm; and a second loudspeaker which is included in the inner chamber, wherein the second loudspeaker comprises a second magnet and a second diaphragm spaced apart from each other in a direction of oscillation of the second diaphragm; and wherein the axis of the second magnet is inclined to the axis of the first magnet.

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