Patent ID: 12225347

DETAILED DESCRIPTION

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings that need to be used in the description of the embodiments. Apparently, the accompanying drawings in the following description are only some examples or embodiments of this disclosure, and those skilled in the art can also apply this disclosure to other similar scenarios according to the drawings without creative effort. Unless obviously obtained from the context or the context illustrates otherwise, the same numeral in the drawings refers to the same structure or operation.

It should be understood that “system,” “device,” “unit” and/or “module” used herein are one method to distinguish different components, elements, parts, sections or assembly of different level in ascending order. However, the terms may be displaced by another expression if they achieve the same purpose.

As used in the disclosure and the appended claims, the singular forms “a,” “an,” and “the” include plural referents unless the content clearly dictates otherwise. Generally speaking, the terms “comprise,” and “include,” when used in this specification, specify the presence of stated steps and elements, these steps and elements do not constitute an exclusive list, and the method or the device may also include other steps or elements.

The embodiments of the present disclosure provide a sound-producing device. In some embodiments, the sound-producing device may include a diaphragm and a housing. In some embodiments, the housing may include a first sound guide hole and a second sound guide hole. The diaphragm may be disposed in the housing, and the first sound guide hole and the second sound guide hole may be respectively located on both sides of the diaphragm. When a user wears the sound-producing device, a distance between the first sound guide hole and an ear canal opening of the user may be smaller than a distance between the diaphragm and the ear canal opening of the user, and a distance between the second sound guide hole and the ear canal opening of the user may be greater than the distance between the diaphragm and the ear canal opening of the user, so that the first sound guide hole may be closer to the ear canal opening of the user, and the second sound guide hole may be further away from the ear canal opening of the user. Sound output by the first sound guide hole and sound output by the second sound guide hole may satisfy a certain condition (e.g., a phase difference may be about 180°, to form dipole-like radiation. In a far field, the sound output by the first sound guide hole and the sound output by the second sound guide hole may be cancelled due to reverse phases, thereby reducing a sound leakage volume of the sound-producing device in the far field and preventing the sound output by the sound-producing device from being heard by people nearby. In some embodiments, an included angle between a connection line between the first sound guide hole and the second sound guide hole and a connection line between the center of mass of the diaphragm and the ear canal opening of the user may be smaller than 45°. When the user wears the sound-producing device, the included angle between the connection line between the first sound guide hole and the second sound guide hole and the connection line between the center of mass of the diaphragm and the ear canal opening of the user may be a specific angle (e.g., smaller than (45°). A direction of the dipole-like radiation formed by the sound output by the first sound guide hole and the sound output by the second sound guide hole may point to the ear canal of the user, thereby increasing an audible volume and reducing the sound leakage volume in the far field when the user wears the sound-producing device. In some embodiments, when the sound-producing device is a wearable device (e.g., glasses, a smart helmet, etc.) with an audio function, on one hand, acoustic units of the sound-producing device may not interfere with the ear of the user (e.g., blocking the ear canal), thereby improving the user's experience when wearing the sound-producing device; on the other hand, acoustic performance may be ensured and sound leakage may be reduced by setting the first sound guide hole and the second sound guide hole.

FIG.1is a frame diagram illustrating an exemplary sound-producing device according to some embodiments of the present disclosure. As shown inFIG.1, the sound-producing device100may include an acoustic unit110and a wearing component120.

In some embodiments, the sound-producing device100may include glasses, a smart bracelet, an earphone, a hearing aid, a smart helmet, a smart watch es, a smart clothing, a smart backpack, a smart accessory, or the like, or any combination thereof. For example, the sound-producing device100may be functional myopia glasses, presbyopic glasses, cycling glasses or sunglasses, etc., or smart glasses, such as audio glasses with an earphone function. The sound-producing device100may also be a head-mounted device such as a helmet, an Augmented Reality (AR) device, or a Virtual Reality (VR) device. In some embodiments, the AR device or the VR device may include a VR helmet, VR glasses, an AR helmet, AR glasses, or the like, or any combination thereof. For example, the VR device or the VR device may include Google Glass, Oculus Rift, Hololens, Gear VR, etc.

The acoustic unit110may be configured to convert a signal containing sound information into a sound signal. In some embodiments, the sound signal may include bone conduction sound waves or air conduction sound waves. For example, the acoustic unit110may generate a mechanical vibration to output the sound waves (i.e., sound signal) in response to receiving the signal containing the sound information. For example, if the acoustic unit110is an air conduction speaker, the acoustic unit110may include a housing111, a vibrating component112, and a magnetic circuit structure113. The vibrating component112and the magnetic circuit structure113may be accommodated in the housing111. The vibrating component112and the magnetic circuit structure113may be connected through a voice coil (not shown inFIG.1). The vibrating component112may be a diaphragm. An internal magnetic field of the magnetic circuit structure113may change in response to a signal containing sound (i.e., an electrical signal). The voice coil may vibrate under an action of the magnetic circuit structure113. The vibrating component112(diaphragm) may vibrate in response to the vibration of the voice coil. The vibrating component112may drive the air inside the housing111to vibrate, thereby producing the sound waves. In some embodiments, the acoustic unit110may further include one or more sound guide holes. The sound waves produced at the vibrating component112may be radiated to external environment through the sound guide holes. As another example, when the acoustic unit110is a bone conduction speaker, the acoustic unit110may include the vibrating component112and/or a vibration-transmitting component (e.g., at least a portion of a housing of the wearing component120in the sound-producing device100) connected with the vibrating component112. The acoustic unit110may produce mechanical vibration accompanied by energy conversion. The acoustic unit110may implement a conversion of a signal containing sound information into the mechanical vibration. The mechanical vibration may be transmitted to an auditory nerve of a user through a sound-transmitting component by means of bone conduction. It should be noted that, when the acoustic unit110is the bone conduction speaker, the acoustic unit110may also produce air conduction sound waves while the mechanical vibration (i.e., bone conduction sound waves) is outputted. The above conversion process may include the coexistence and conversion of various types of energy. For example, the electrical signal (i.e., the signal containing the sound information) may be directly converted into the mechanical vibration through the vibrating component112of the acoustic unit110, and the mechanical vibration may be transmitted through the vibration-transmitting component to transmit the sound waves. As another example, the sound information may be contained in an optical signal. A specific acoustic unit110may implement a process of converting the optical signal into the sound signal. Other types of energy that can coexist and be converted during operation of the acoustic unit110may include thermal energy, magnetic field energy, or the like. In some embodiments, a type of the acoustic unit110may include a moving coil type, an electrostatic type, a piezoelectric type, a moving iron type, a pneumatic type, an electromagnetic type, etc.

In some embodiments, the acoustic unit110may include one or more air conduction speakers. In some embodiments, the acoustic unit110may include one or more bone conduction speakers. In some embodiments, the acoustic unit110may include a combination of one or more bone conduction speakers and one or more air conduction speakers. In some embodiments, the acoustic unit110may be arranged at the wearing component120to transmit the produced sound to the user. In some embodiments, the acoustic unit110may be arranged at an end of the wearing component120or any other positions. For example, the acoustic unit110may be arranged at an end of the wearing component120, while no acoustic unit110may be arranged at other positions of the wearing component120. In some embodiments, a plurality of acoustic units110may be arranged at a plurality of positions of the wearing component120. For example, at least one acoustic unit110may be arranged at the end of the wearing component120or other positions. In some embodiments, the acoustic unit110may be arranged on an outer surface of the wearing component120or inside the wearing component120. For example, the acoustic unit110may be arranged near a position (e.g., a position of the wearing component120near the temple to the ear of the user) where the wearing component120is in contact with the user. As another example, the wearing component120may include a cavity for accommodating the acoustic unit110. At least a portion of the acoustic unit110may be accommodated in the cavity. As another example, the acoustic unit110and the wearing component120may be in an integrated structure.

In some embodiments, the sound-producing device100may further include a visual component (not shown inFIG.1). The visual component may be used to be erected on a certain part of the user's body, for example, eyes, hands, or other positions. The wearing component120may be connected with one end or both ends of the visible component for keeping the sound-producing device100in stable contact with the user. In some embodiments, the visual component may be a lens, a display screen, or a display screen acting as a lens. In some embodiments, the visible component may also be a lens and an auxiliary component thereof, or a display screen and an auxiliary component thereof. The auxiliary component may be a component such as a spectacle frame, a bracket, etc. In some embodiments, the visual component may also be an auxiliary component that does not include the lens or the display screen.

In some embodiments, the wearing component120may be a glasses leg, or a head-mounted component, etc. For example, if the wearing component120is the glasses leg, the sound-producing device100may include the visual component and two wearing components120. The two wearing components120may be respectively connected to two ends of the visual component, and used to be respectively erected on the corresponding left ear and right ear. As another example, if the wearing component120is the head-mounted component, the head-mounted component may be adjusted to adapt to the head shape of the user. Various functional components may also be arranged on the head-mounted component, and the sound-producing device100may include a visual component and a wearing component120. The two ends of the wearing component120may be respectively connected to the two ends of the visual component. It should be noted that the structure of the wearing component120may be adaptively adjusted according to the type of the sound-producing device100or specific application scenarios.

It should be understood thatFIG.1is provided for illustrative purposes only and is not intended to limit the scope of the present disclosure. Those skilled in the art can make various changes and modifications under the guidance of the contents of the present disclosure. These changes and modifications may all fall within the scope of protection for the application. In some embodiments, the number of originals in the figure may be adjusted according to actual conditions. In some embodiments, one or more elements inFIG.1may be omitted, or one or more other elements may be added or removed. For example, the sound-producing device100may not include the wearing component120, and the housing111may have a wearing function of the wearing component120. In some embodiments, an element may be replaced by another element that performs a similar function. In some embodiments, an element may be split into a plurality of sub-elements, or a plurality of elements may be combined into a single element. For example, the housing111and the wearing component120may be combined into one element.

In order to further describe the sound-producing device, an exemplary description of the sound-producing device is described hereinafter.FIG.2is a schematic structural diagram illustrating a sound-producing device according to some embodiments of the present disclosure. The sound-producing device200inFIG.2may be a VR device or an AR device. As shown inFIG.2, the sound-producing device200may include an acoustic unit210, a wearing component220, and a visual component230. In some embodiments, the wearing component220may be a head-mounted component. The wearing component220may be a structure made of an elastic material or a structure with an adjustable length. Two ends of the wearing component220may be respectively connected with two ends of the visual component230. When a user wears the sound-producing device200, the wearing component220and the visual component230may surround the head of the user, and wearing of the sound-producing device200may be implemented through the pressure of the wearing component220and the visual component230on the head of the user. In some embodiments, the connection between the wearing component220and the visual component230may include, but not limited to, a flexible connection such as a rotational connection or a telescopic connection, or a relatively fixed connection such as a clamping connection, a screw connection, or an integral molding connection.

In some embodiments, the wearing component220may include a concave part240for placing the acoustic unit210. When the user wears the sound-producing device200, the concave part240may be located near the ear of the user (e.g., a front side, an upper side, etc.). In this way, the acoustic unit210may be located close to the ear of the user without blocking an ear canal opening of the user, so that the user may receive sound from an external environment while the sound produced by the acoustic unit210is listened by the user. In some embodiments, the acoustic unit210may be located on an outer surface of the concave part240. For example, when the acoustic unit210is a bone conduction speaker, the acoustic unit210may be located on a side surface of the concave part240in contact with the user. As another example, when the acoustic unit210is an air conduction speaker, the acoustic unit210may be located on a side surface of the concave part240not in contact with the user. In some embodiments, the acoustic unit210may be located inside the concave part240. For example, an accommodation cavity (not shown inFIG.2) for accommodating the acoustic unit210may be arranged inside the concave part240. The acoustic unit210may be located in the accommodation cavity. When the acoustic unit210is located in the accommodation cavity, the concave part240may be used as a housing of the acoustic unit210, and other components (e.g., a magnetic circuit structure, a diaphragm, etc.) of the acoustic unit210may be located in the concave part240. Taking the air conduction speaker used as the acoustic unit210as an example, in some embodiments, the acoustic unit210may include a diaphragm and a magnetic circuit structure (not shown inFIG.2). The diaphragm and the magnetic circuit structure may be connected through a voice coil. The magnetic circuit structure may be connected with the housing (or the concave part240) of the acoustic unit210. A side of the diaphragm facing away from the magnetic circuit structure may form a front surface of the acoustic unit210, and a side of the magnetic circuit structure facing away from the diaphragm may form a back surface of the acoustic unit210. The diaphragm may vibrate to cause the acoustic unit to radiate sound outwards from the front surface and the back surface of the acoustic unit respectively. In some embodiments, the housing (or the concave part240) of the acoustic unit210may include at least two sound guide holes (not shown inFIG.2). The sound guide holes may include a first sound guide hole (also referred to as a sound outlet) and a second sound guide hole (also referred to as a pressure relief port). The first sound guide hole may be configured to output sound produced from the front surface of the acoustic unit210, and the second sound guide hole may be configured to output sound produced from the back surface of the acoustic unit220. A phase of the sound output from the first sound guide hole and a phase of the sound output from the second sound guide hole may be regarded as opposite, so that the sound output from the first sound guide hole and the sound output from the second sound guide hole may construct a dipole. When the user wears the sound-producing device200, the first sound guide hole may be closer to the ear canal opening of the user, and the second sound guide hole may face away from the ear canal opening of the user, so that the acoustic unit210may have a relatively good acoustic output effect. In some embodiments, there may be one or more first sound guide holes and second sound guide holes. In some embodiments, the listening effect and sound leakage reduction effect of the sound-producing device200may be further improved by adjusting parameters such as the numbers, sizes, positions, and acoustic resistances of the first sound guide hole or the second sound guide hole. More descriptions regarding the first sound guide hole, the second sound guide hole, and the concave part240may be found elsewhere in the present disclosure (e.g.,FIGS.4-11and the descriptions thereof).

FIG.3is a schematic structural diagram illustrating another sound-producing device according to some embodiments of the present disclosure. A sound-producing device300inFIG.3may be glasses. As shown inFIG.3, the sound-producing device300may include an acoustic unit310, a wearing component320, and a visual component330(i.e., a spectacle frame or a lens). In some embodiments, the wearing component320may include two glasses leg structures. One end of the wearing component320may be connected with an end of the visual component330. The two glasses leg structures may be matched with the left ear and the right ear of the user respectively. When the user wears the sound-producing device300, wearing of the sound-producing device200may be implemented by supporting the wearing component320through the ears of the user and supporting the visual component230through the nose bridge of the user. In some embodiments, the connection between the wearing component320and the visual component330may include, but not limited to, a flexible connection such as a rotational connection or a telescopic connection, or a relatively fixed connection such as a clamping connection, a screw connection, or an integral molding connection. The structure of the acoustic unit310may be similar to that of the acoustic unit210inFIG.2, and the structure of a concave part340may be similar to that of the concave part240inFIG.2, which are not repeated herein.

It should be noted that the above descriptions about the sound-producing device200and the sound-producing device300are provided for illustrative purposes only and are not intended to limit the scope of the present disclosure. Those skilled in the art can make various changes and modifications to the sound-producing device200and the sound-producing device300under the guidance of the contents of the present disclosure. However, such modifications and changes still fall within the scope of the present specification. For example, the wearing component220of the sound-producing device200may be a glasses leg structure, and the wearing component320of the sound-producing device300may be a head-mounted component.

When the user wears the sound-producing device, in order to prevent the acoustic unit (e.g., the acoustic unit210, the acoustic unit310) from interfering with the ear of the user, and do not affect the user to receive the sound of the external environment except the sound produced by the acoustic unit, the acoustic unit may be located near the ear of the user or at least a portion of the acoustic unit may be located within a projection area of the ear of the user on the face.FIG.4is a diagram illustrating a sound pressure level of an acoustic unit at different positions according to some embodiments of the present disclosure, which may indicate a degree of influence of sound wave obtained in an actual test (i.e., sound output from the first sound guide hole of the acoustic unit) on an audible volume at different positions in front of the ear. As shown inFIG.4, as an illustrative example, a distribution position of the first sound guide hole of the acoustic unit on a front side of an auricle of the user may be an area 1, an area 2, an area 3, an area 4, an area 5, an area 6, an area 7, an area 8, or an area 9. The lighter the grayscale image in the right part ofFIG.4is, the greater the sound pressure level heard by the human ear is when the first sound guide hole is located near this area. For example, when the first sound guide hole of the acoustic unit is located in the area 9, the audible volume may be approximately 88 dB. As another example, when the first sound guide hole of the acoustic unit is located in the area 6, the audible volume may be approximately 86 dB. As still another example, when the first sound guide hole of the acoustic unit is located in the area 7, the audible volume may be approximately 76 dB. It can be seen fromFIG.4that when the first sound guide hole of the acoustic unit is placed near the area 3, the area 5, the area 6, the area 8, or the area 9, the audible volume may be relatively high. Preferably, when the first sound guide hole of the acoustic unit is placed near the area 5, the area 6, the area 8, or the area 9, it may ensure that the listener may bear a relatively high volume. Further preferably, when the first sound guide hole of the acoustic unit is placed near the area 6 or the area 9, it may ensure that the listener may bear a relatively high volume. In some embodiments, in order to ensure that the user may bear a relatively high volume when wearing the sound-producing device, the first sound guide hole (referring toFIG.7(a)) may be as close as possible to the ear canal opening of the user. However, in order to ensure the opening of the ear canal opening, the first sound guide hole may keep a certain distance from the ear canal opening. A distance between the first sound guide hole and the ear canal opening of the user may refer to a distance between a center of the first sound guide hole and a center of the ear canal opening of the user, or a distance between the center of the first sound guide hole and a plane where the ear canal opening of the user is located. In some embodiments, the distance between the first sound guide hole and the ear canal opening of the user may be smaller than 4 cm. In some embodiments, the distance between the first sound guide hole and the ear canal opening of the user may be smaller than 3 cm. In some embodiments, the distance between the first sound guide hole and the ear canal opening of the user may be within a range of 0.5 cm-2.5 cm. In some embodiments, the distance between the first sound guide hole and the ear canal opening of the user may be within a range of 1 cm-2 cm. The sound produced by the diaphragm of the acoustic unit may be transmitted to the ear canal opening of the user through an acoustic structure (e.g., an acoustic cavity, a sound guide tube, a sound guide hole, etc.). In some embodiments, the listening effect of the sound-producing device may be improved by adjusting a distance between a center of mass of the diaphragm and the ear canal opening of the user. The center of mass of the diaphragm may refer to a mass center of the diaphragm. For example, the diaphragm may have a circular structure, and the center of mass of the diaphragm may be a center of the circular diaphragm. As another example, the diaphragm may have a rectangular structure, and the center of mass of the diaphragm may be a geometric center of the rectangle. The ear canal opening may refer to an opening of an external auditory canal of the human body. The distance between the diaphragm and the ear canal opening of the user may refer to a distance between the center of mass of the diaphragm and the center of the ear canal opening of the user. In other embodiments, the distance between the diaphragm and the ear canal opening of the user may also refer to a distance between the center of mass of the diaphragm and a plane where the ear canal opening of the user is located. In some embodiments, the distance between the center of mass of the diaphragm and the ear canal opening of the user may be smaller than 5 cm. In some embodiments, the distance between the center of mass of the diaphragm and the ear canal opening of the user may be smaller than 4 cm. In some embodiments, the distance between the center of mass of the diaphragm and the ear canal opening of the user may be within a range of 1 cm-4 cm. In some embodiments, the distance between the center of mass of the diaphragm and the ear canal opening of the user may be within a range of 1.5 cm-3.5 cm. In some embodiments, the distance between the center of mass of the diaphragm and the ear canal opening of the user may be within a range of 2 cm-3 cm. In some embodiments, a ratio of the distance between the center of mass of the diaphragm and the ear canal opening of the user to the distance between the first sound guide hole and the ear canal opening of the user may be greater than 1.2. In some embodiments, the ratio of the distance between the center of mass of the diaphragm and the ear canal opening of the user to the distance between the first sound guide hole and the ear canal opening of the user may be within a range of 1.2-4. In some embodiments, the ratio of the distance between the center of mass of the diaphragm and the ear canal opening of the user to the distance between the first sound guide hole and the ear canal opening of the user may be within a range of 1.4-3. In some embodiments, the ratio of the distance between the center of mass of the diaphragm and the ear canal opening of the user to the distance between the first sound guide hole and the ear canal opening of the user may be within a range of 1.5-2. In some embodiments, the ratio of the distance between the center of mass of the diaphragm and the ear canal opening of the user to the distance between the first sound guide hole and the ear canal opening of the user may be within a range of 1.6-1.8.

Under a same sound source, different positions near the ear of the user may affect the acoustic output effect of the acoustic unit. In some embodiments, the acoustic output effect of the acoustic unit in the sound-producing device may be improved by adjusting the position of the first sound guide hole in the acoustic unit.FIG.5is a schematic diagram illustrating distributions of an acoustic unit at different positions according to some embodiments of the present disclosure.

As shown inFIG.5(a), the sound-producing device may be glasses. The sound-producing device may include a wearing component510and an acoustic unit511. The wearing component510may have a glasses leg structure. The acoustic unit511may have a cuboid structure. A side of the acoustic unit511with a larger length may be connected with the wearing component510, and a side of the acoustic unit511with a smaller length may be approximately perpendicular to the wearing component510. When the user wears the sound-producing device, the acoustic unit511may be located on a front side of an upper part of the auricle of the user. The side of the acoustic unit511with the smaller length may be directly opposite to the auricle of the user. In some embodiments, the acoustic unit511may include a first sound guide hole (not shown inFIG.5(a)). The first sound guide hole may be configured to output the sound produced from a front surface of the acoustic unit511to external environment. The first sound guide hole may be located at a lower right corner of the acoustic unit511, so that the first sound guide hole of the acoustic unit511may be close to the ear canal opening of the user. The position of the first sound guide hole may be regarded as a position near the area 2 or the area 3 inFIG.4.

The structure of the sound-producing device inFIG.5(b)may be substantially the same as that inFIG.5(a). A difference between the sound-producing devices inFIG.5(b)andFIG.5(a)may be that a connection position of the acoustic unit512in the sound-producing device inFIG.5(b)with the glasses leg structure and a connection position of the acoustic unit511in the sound-producing device inFIG.5(a)with the glasses leg structure are different. As shown inFIG.5(b), a side of the acoustic unit512with a smaller length may be connected with the wearing component, and a side of the acoustic unit512with a larger length may be approximately vertical to the wearing component. When the user wears the sound-producing device, the acoustic unit512may be located on the front side of the auricle of the user. The side of the acoustic unit512with the larger length may be directly opposite to the auricle of the user. In some embodiments, the acoustic unit512may include a first sound guide hole (not shown inFIG.5(b)). The sound hole is located at the lower right corner of the acoustic unit512, so that the first sound guide hole of the acoustic unit512is close to the opening of the ear canal opening of the user. Taking a height of the ear canal opening of the user as a reference plane, the position of the first sound guide hole inFIG.5(b)may be lower than the position of the first sound guide hole inFIG.5(a). That is to say, the position of the first sound guide hole inFIG.5(b)may be closer to the ear canal opening of the user. The position of the first sound guide hole inFIG.5(b)may be regarded as a position near the area 5 or the area 8 inFIG.4.

The structure of the sound-producing device inFIG.5(c)may be substantially the same as that inFIG.5(b). A difference between the sound-producing devices inFIG.5(b)andFIG.5(c)may be that a connection position of the acoustic unit513in the sound-producing device inFIG.5(c)with the glasses leg structure and a connection position of the acoustic unit512in the sound-producing device inFIG.5(b)with the glasses leg structure are different. As shown inFIG.5(c), a side of the acoustic unit513with a smaller length may be connected with the wearing component, and a side of the acoustic unit513with a large length may be connected with the wearing component at an angle (e.g., smaller than 90°), so that the first sound guide hole of the acoustic unit513may be closer to the ear canal opening of the user. When the user wears the sound-generating device, the acoustic unit513may be arranged on the front side of the auricle. The side of the acoustic unit513with the larger length may be inclined toward the ear canal opening of the user, so that the first sound guide hole of the acoustic unit513may be closer to the ear canal opening of the user. Here, the position of the first sound guide hole inFIG.5(c)may be regarded as a position near the area 6 or the area 9 inFIG.4.

FIG.6is a schematic structural diagram illustrating an acoustic unit according to some embodiments of the present disclosure. As shown inFIG.6, the acoustic unit may include a housing610configured to carry a diaphragm and a magnetic circuit structure (both not shown inFIG.6) of the acoustic unit. The diaphragm and the magnetic circuit structure may be connected through a voice coil. The magnetic circuit structure may be connected with the housing610. A side of the diaphragm facing away from the magnetic circuit structure may form a front surface of the acoustic unit, and a side of the magnetic circuit structure facing away from the diaphragm may form a back surface of the acoustic unit. The diaphragm may vibrate to cause the acoustic unit to radiate sound outwards from the front surface and the back surface of the acoustic unit respectively. In some embodiments, the housing610and the diaphragm may form a first acoustic cavity for radiating sound. The first acoustic cavity and the first sound guide hole may be acoustically coupled. The first sound guide hole may be located at different side walls of the housing corresponding to the first acoustic cavity. When the user wears the sound-producing device, the first sound guide hole may be close to the ear canal opening of the user. In some embodiments, the first sound guide hole may include a first hole part621and a second hole part622. The first hole part621and the second hole part622may be connected. The first hole part621and the second hole part622may be located at different side walls of the housing corresponding to the first acoustic cavity. For example, the first hole part621and the second hole part622may be located at two adjacent side walls of the housing corresponding to the first acoustic cavity. As another example, the first hole part621and the second hole part622may be located at two adjacent edges of the housing corresponding to the first acoustic cavity. In some embodiments, a length of the side wall where the first hole part621is located may be greater than a length of the side wall where the second hole part622is located. That is to say, the first hole part621may be located at the side wall of the housing610with a relatively large length, and the second hole part622may be located at the side wall of the housing610with a relatively small length. When the acoustic unit is located at a wearing component (e.g., the wearing component510inFIG.5(c)), the first hole part621and the second hole part622of the first sound guide hole may be closer to the ear canal opening of the user. For example, the first hole part621and the second hole part622inFIG.6may be located at a lower right corner of the housing610. When the user wears the sound-producing device, the position of the acoustic unit may be located at a front side of the auricle of the user as shown inFIG.6. Here, the acoustic unit may be arranged obliquely. The first hole part621may be in contact with other parts (e.g., a tragus) of the user's ear. Then the first hole part621may not directly face the ear canal opening of the user, which affects the user's hearing experience. In order to improve the acoustic output effect of the acoustic unit, the first sound guide hole may be enabled to face the ear canal opening of the user by setting the second hole part622at another side wall adjacent to the side wall of the housing610where the first hole part621is located. For the convenience of understanding, the first hole part621and the second hole part622may be treated as an equivalent sound guide hole623here. The equivalent sound guide hole623may be regarded as a connection area formed by connecting two ends of the first hole part621and the second hole part622with the largest distance. When the acoustic unit is arranged obliquely, the equivalent sound guide hole623may face toward the ear canal opening of the user. In some embodiments, the acoustic unit may include at least one resonance frequency. The resonance frequency may be positively correlated with an area of the first sound guide hole620of the acoustic unit, i.e., the larger the area of the first sound guide hole620is, the higher the resonance frequency is. When the acoustic unit has a relatively high resonance frequency, a corresponding frequency response curve of the acoustic unit may be relatively flat in a frequency range smaller than the resonance frequency. In this case, the acoustic unit has a relatively good acoustic output effect in a wider frequency range. In this embodiment, the second hole part622may be arranged on the acoustic unit on the basis of the first hole part621, so that the first sound guide hole may face the ear canal opening of the user, the area of the first sound guide hole may also be increased, and the resonance frequency of the acoustic unit may be increased, thereby improving the acoustic output effect of the acoustic unit.

As a main output part of the frontal sound of the acoustic unit, the first hole part621may have a relatively large length. The larger the length of the first hole part is, the higher the resonance frequency of the first acoustic cavity and the first sound guide hole of the acoustic unit may be, so that the better the acoustic output effect of the acoustic unit is in a wider frequency range. In some embodiments, a ratio of the length of the first hole part621to the length of the side wall where the first hole part621is located may be smaller than 0.9. In some embodiments, the ratio of the length of the first hole part621to the length of the side wall where the first hole part621is located may be within a range of 0.3-0.8. In some embodiments, the ratio of the length of the first hole part621to the length of the side wall where the first hole part621is located may be within a range of 0.4-0.8. In some embodiments, the ratio of the length of the first hole part621to the length of the side wall where the first hole part621is located may be within a range of 0.5-0.7.

In some embodiments, the length of the second hole part622may be greater than or equal to ⅙ of the length of the side wall where the second hole part622is located. In some embodiments, a ratio of the length of the second hole part622to the length of the side wall where the second hole part622is located may be within a range of 0.1-0.8. In some embodiments, the ratio of the length of the second hole part622to the length of the side wall where the second hole part622is located may be within a range of ⅙-⅔. In some embodiments, the ratio of the length of the second hole part622to the length of the side wall where the second hole part622is located may be within a range of 0.2-0.6. In some embodiments, the ratio of the length of the second hole part622to the length of the side wall where the second hole part622is located may be within a range of 0.3-0.5. In some embodiments, the first hole part621and the second hole part622may be in regular or irregular shapes such as a rectangle, a circle, a triangle, an ellipse, and a semicircle.

It should be noted that the housing610of the acoustic unit may not limited to the cuboid structure inFIG.6, and may also be a cylinder, a trapezoidal structure, a triangular prism or other regular or irregular structures. In some embodiments, the length of the side wall where the first hole part621is located may be the same as the length of the side wall where the second hole part622is located, or the length of the side wall where the first hole part621is located may be smaller than the length of the side wall where the second hole part622is located.

It should be understood that the schematic diagram inFIG.6is provided for illustrative purposes only, and is not intended to limit the scope of the present disclosure. Those skilled in the art can make various variations and modifications under the guidance of the present disclosure. Such variations and modifications all fall within the scope of protection for the disclosure. In some embodiments, one or more features such as the shape, size, and position of the originals shown in the figure can be adjusted according to actual conditions. For example, the length of the first hole part621may be greater than, equal to, or smaller than that of the second hole part622, or the cross-sectional area of the first hole part621may be greater than, equal to, or smaller than that of the second hole part622.

In order to further illustrate the acoustic unit, several acoustic units provided inFIG.7may be used as examples for description.FIG.7is a schematic structural diagram illustrating different acoustic units according to some embodiments of the present disclosure.

As shown inFIG.7(a), the acoustic unit710may include a housing711and an acoustic transducer712. In some embodiments, the housing711may be a hollow cuboid structure. In other embodiments, the housing711may also be a cylinder, a trapezoidal structure, a triangular prism and other regular or irregular structures. The acoustic transducer712may be configured to convert a signal containing sound information into a sound signal. In some embodiments, the acoustic transducer712may include a diaphragm and a magnetic circuit structure. The diaphragm and the magnetic circuit structure may be connected through a voice coil. The magnetic circuit structure may be connected with the housing711. An internal magnetic field of the magnetic circuit structure may change in response to the signal containing the sound (i.e., the electrical signal). The voice coil may vibrate under the action of the magnetic circuit structure. The diaphragm may vibrate in response to the vibration of the voice coil. The diaphragm may drive the air inside the housing711to vibrate to produce sound waves. In some embodiments, a side of the diaphragm of the acoustic transducer712away from the magnetic circuit structure may be a front surface of the diaphragm, and another side of the diaphragm of the acoustic transducer712may be a back surface of the diaphragm. The diaphragm may vibrate to radiate sound from the front surface and the back surface of the diaphragm, respectively. In some embodiments, the housing711and the diaphragm may form a first acoustic cavity713for radiating sound, and the housing711and the magnetic circuit structure may form a second acoustic cavity714for radiating sound. In some embodiments, the acoustic unit710may further include a first sound guide hole715. The first sound guide hole715may be configured to output the sound produced from the front surface of the diaphragm toward the ear canal opening of the user. The first sound guide hole715and the first acoustic cavity713may be acoustically coupled. Specifically, the first sound guide hole715may be located at a side wall of the housing711where the first acoustic cavity713is located. In some embodiments, the first sound guide hole715may include a first hole part7151and a second hole part7152. The first hole part7151may be located at different side walls of the housing711corresponding to the first acoustic cavity713. In some embodiments, the length of the side wall where the first hole part7151is located may be greater than the length of the side wall where the second hole part7152is located, i.e., the first hole part7151may be located at a side wall of the housing711with a larger length, and the second hole part7152may be located at a side wall of the housing711with a smaller length. When the acoustic unit710is located on a wearing component (e.g., the wearing component510inFIG.5), the first hole part7151and the second hole part7152may be closer to the ear canal opening of the user. For example, the first hole part7151and the second hole part7152inFIG.7(a)may be located at a lower right corner of the housing711. When the user wears the sound-producing device, the position of the acoustic unit710may be located on a front side of the auricle of the user. Here, the acoustic unit710may be arranged obliquely. The first hole part7151may be in contact with other parts (e.g., the tragus) of the user's ear. In this case, the first hole part7151may not face the ear canal opening of the user, which affects the user's hearing experience. In order to improve the acoustic output effect of the acoustic unit710, the first sound guide hole715may be enabled to better face towards the ear canal opening of the user by setting the second hole part7152at another side wall adjacent to the side wall of the housing711where the first hole part7151is located. More descriptions regarding the first hole part7151and the second hole part7152may be found elsewhere in the present disclosure (e.g.,FIG.6and related descriptions thereof), which is not repeated herein.

In order to reduce the sound leakage of the acoustic unit710, in some embodiments, the acoustic unit710may further include a second sound guide hole716. The second sound guide hole716may be configured to transport the sound produced from the back surface of the diaphragm to the external environment. In some embodiments, the second sound guide hole716may be located at a side wall of the housing711corresponding to the second acoustic cavity714. The second sound guide hole716and the second acoustic cavity714may be acoustically coupled. In some embodiments, the second sound guide hole716and the first sound guide hole715may be arranged oppositely. Here, the opposite arrangement may be understood as that an opening orientation of the second sound guide hole716and an opening orientation of the first sound guide hole715may be opposite or approximately opposite. For example, the first sound guide hole715may be located at a first side wall and a second side wall of the housing711. The first side wall and the second side wall may be two adjacent side walls in the housing711. The first hole part7151of the first sound guide hole715may be located at the first side wall. The second hole part7152of the first sound guide hole715may be located at the second side wall. The first hole part7151and the second hole part7152may be connected. The first hole part7151and the second hole part7152may be acoustically coupled with the first acoustic cavity713. The second sound guide hole716may be located at a third side wall opposite to the second side wall. The second sound guide hole716and the second acoustic cavity714may be acoustically coupled. When the user wears the sound-producing device, the first hole part7151and the second hole part7152of the first sound guide hole715may face the ear canal opening of the user, and the second sound guide hole716may face away from the ear canal opening of the user. The sound output from the first sound guide hole715and the sound output from the second sound guide hole716may satisfy a specific condition (e.g., the phase difference may be about 180°) to form dipole-like radiation. In a far field, the sound output from the first sound guide hole715and the sound output from the second sound guide hole716may be canceled due to reverse phases, thereby reducing the sound leakage volume of the acoustic unit710in the far field and preventing the sound output from the acoustic unit710from being heard by people nearby. When the user wears the sound-producing device, a distance between the second sound guide hole715and the ear canal opening of the user may be too small, which may cause the sound output from the second sound guide hole715near the ear canal opening of the user and the sound output from the first sound guide hole715to be offset. In order to ensure the audible volume at the ear canal opening of the user and reduce the sound leakage volume in the far field, in some embodiments, the distance between the second sound guide hole716and the ear canal opening of the user may be greater than 1 cm. In addition, if the distance between the first sound guide hole715and the second sound guide hole716is too large, or if the distance between the second sound guide hole716and the ear canal opening is too large, the dimension of the sound-producing device may be too large, which may affect the user's wearing experience. In order to ensure the user's wearing experience, in some embodiments, the distance between the second sound guide hole716and the ear canal opening of the user may be smaller than 8 cm. Preferably, the distance between the second sound guide hole716and the ear canal opening of the user may be within a range of 1.5 cm-7 cm. Further preferably, the distance between the second sound guide hole716and the ear canal opening of the user may be within a range of 1.5 cm-5 cm. More preferably, the distance between the second sound guide hole716and the ear canal opening of the user may be within a range of 2 cm-4.5 cm. Further preferably, the distance between the second sound guide hole716and the ear canal opening of the user may be within a range of 2.5 cm-4 cm. When the user wears the sound-generating device, in order to ensure the audible volume at the ear canal opening of the user and the sound leakage reduction effect of the sound-generating device in the far field, a ratio of the distance between the second sound guide hole716and the ear canal opening of the user to the distance between the first sound guide hole715and the ear canal opening of the user may be increased as much as possible. In some embodiments, the ratio of the distance between the second sound guide hole716and the ear canal opening of the user to the distance between the first sound guide hole715and the ear canal opening of the user may be greater than 1.2. In some embodiments, the ratio of the distance between the second sound guide hole716and the ear canal opening of the user to the distance between the first sound guide hole715and the ear canal opening of the user may be within a range of 1.2-8. In some embodiments, the ratio of the distance between the second sound guide hole716and the ear canal opening of the user to the distance between the first sound guide hole715and the ear canal opening of the user may be within a range of 1.2-7. In some embodiments, the ratio of the distance between the second sound guide hole716and the ear canal opening of the user to the distance between the first sound guide hole715and the ear canal opening of the user may be within a range of 1.3-6. In some embodiments, the ratio of the distance between the second sound guide hole716and the ear canal opening of the user to the distance between the first sound guide hole715and the ear canal opening of the user may be within a range of 1.4-5. In some embodiments, the ratio of the distance between the second sound guide hole716and the ear canal opening of the user to the distance between the first sound guide hole715and the ear canal opening of the user may be within a range of 1.5-3. In some embodiments, the ratio of the distance between the second sound guide hole716and the ear canal opening of the user to the distance between the first sound guide hole715and the ear canal opening of the user may be within a range of 1.5-2.5.

Referring toFIG.6, in some embodiments, a direction of the dipole-like radiation formed by the sound output from the first sound guide hole (including the first hole part621and the second hole part622) and the sound output from the second sound guide hole may be enabled to point to the ear canal of the user by adjusting an included angle θ formed by a connection line L between the first sound guide hole and the second sound guide hole630and a connection line M between the center of mass O of the diaphragm and the ear canal opening, thereby improving the audible volume and reducing the sound leakage volume in the far field when the user wears the acoustic unit. In addition, the center of mass O of the diaphragm may be approximately regarded as the center point of the diaphragm. The process of adjusting the included angle θ may be regarded as the rotation of the acoustic unit with the center of mass O of the diaphragm as the center of rotation. The connection line M between the center of mass O of the diaphragm and the ear canal opening of the user may be approximately regarded as a straight line with a fixed position. By adjusting (e.g., reducing) the included angle θ, the first hole part621of the first sound guide hole may be arranged obliquely relative to the tragus of the user, and an area of the first hole part621facing the tragus of the user may be reduced, thereby reducing the influence of the tragus on the sound output from the first hole part621. In addition, by adjusting the included angle θ, the second hole part622adjacent to the first hole part621may be closer to the ear canal opening of the user, thereby improving the user's audible volume. In order to reduce the influence of the tragus of the user and ensure that the audible volume at the ear canal of the user is relatively large, in some embodiments, the included angle θ formed by the connection line L between the first sound guide hole and the second sound guide hole630and the connection line M between the center of mass O of the diaphragm and the ear canal opening of the user may be smaller than 60°. In order to further reduce the influence of the tragus of the user and improve the audible volume at the ear canal of the user, in some embodiments, the included angle θ formed by the connection line L between the first sound guide hole and the second sound guide hole630and the connection line M between the center of mass O of the diaphragm and the ear canal opening of the user may be smaller than 45°. Preferably, the included angle θ formed by the connection line L between the first sound guide hole and the second sound guide hole630and the connection line M between the center of mass O of the diaphragm and the ear canal opening of the user may be smaller than 35°. Further preferably, the included angle θ formed by the connection line L between the first sound guide hole and the second sound guide hole630and the connection line M between the center of mass O of the diaphragm and the ear canal opening of the user may be smaller than 20°. More preferably, the included angle θ formed by the connection line L between the first sound guide hole and the second sound guide hole630and the connection line M between the center of mass O of the diaphragm and the ear canal opening of the user may be smaller than 10°. In some embodiments, the smaller the included angle θ formed by the connection line L between the first sound guide hole and the second sound guide hole630and the connection line M between the center of mass O of the diaphragm and the ear canal opening of the user is, the greater the distance difference between the first sound guide hole and the second sound guide hole630relative to the ear canal opening of the user may be. In this case, the smaller a degree of superposition and cancellation of the sound transmitted to the ear canal opening from the second sound guide hole630and the sound transmitted to the ear canal opening from the first sound guide hole is, the greater the volume the user may bear. In order to further improve the audible volume at the ear canal opening of the user, in some embodiments, the positions and sizes of the first hole part621and the second hole part622in the first sound guide hole may also be adjusted. More descriptions regarding the positions and sizes of the first hole part621and the second hole part622may be found elsewhere in the present disclosure (e.g.,FIG.6).

It should be noted that the connection line between the first sound guide hole and the second sound guide hole620may be a connection line between geometric centers of the two sound guide holes, or a connection line between a geometric center of an equivalent sound guide hole623corresponding to the first sound guide hole and a geometric center of an equivalent sound guide hole corresponding to the second sound guide hole630. In addition, the diaphragm may be arranged parallel, vertical, or inclined relative to a contact surface of the acoustic unit and the user's face, and may be adaptively adjusted according to actual application scenarios. More descriptions regarding the parameters of the first sound guide hole, the center of mass of the diaphragm, and the ear canal opening may be found elsewhere in the present disclosure (e.g.,FIG.4and related descriptions thereof).

FIG.7(b)is a schematic structural diagram illustrating another acoustic unit according to some embodiments of the present disclosure. The structure of the acoustic unit720inFIG.7(b)may be substantially the same as that of the acoustic unit710inFIG.7(a). A difference between the acoustic unit720inFIG.7(b)and the acoustic unit710inFIG.7(a)may be that the structure and distribution of the second sound guide hole726of the acoustic unit720inFIG.7(b)may be different from the structure and distribution of the second sound guide hole716of the acoustic unit710in inFIG.7(a). The structures of the housing721, the acoustic transducer722, the first acoustic cavity723, second acoustic cavity724, and the first sound guide hole725inFIG.7(b)may be respectively similar to the structures of the housing711, the acoustic transducer712, the first acoustic cavity713, the second acoustic cavity714, and the first sound guide hole715FIG.7(a), which are not repeated herein. As shown inFIG.7(b), the second sound guide hole726may include a third hole part7261and a second hole part7262. The third hole part7261and the second hole part7262may be acoustically coupled with the second acoustic cavity724to output the sound produced from the back surface of the acoustic unit720. In some embodiments, the third hole part7261and the first hole part (referring to the first hole part7151inFIG.7(a)) of the first sound guide hole725may be arranged oppositely. A fourth hole part7262and the second hole part (referring to the second hole part7152inFIG.7(a)) of the first sound guide hole725may be arranged oppositely. Specifically, the third hole part7261may be located on a fourth side wall opposite to the first side wall where the first hole part of the first sound guide hole725is located, and the fourth hole part7262may be located at a third side wall opposite to the second side wall where the second hole part of the first sound guide hole725is located. When the user wears the sound-producing device, the first hole part and the second hole part of the first sound guide hole725may face the ear canal opening of the user, and the third hole part7261and the fourth hole part7262of the second sound guide hole726may face away from the ear canal opening of the user. The sound output from the first sound guide hole725and the sound output from the second sound guide hole726may satisfy a specific condition (e.g., the phase difference may be about 180°) to form dipole-like radiation. In a far field, the sound output from the first sound guide hole725and the sound output from the second sound guide hole726may be cancelled due to reverse phases, thereby reducing the sound leakage volume of the acoustic unit720in the far field, and preventing the sound output from the acoustic unit720being heard by people nearby.

FIG.7(c)is a schematic structural diagram illustrating another acoustic unit according to some embodiments of the present disclosure. The structure of the acoustic unit730inFIG.7(c)may be substantially the same as that of the acoustic unit710inFIG.7(a). A difference between the acoustic unit730inFIG.7(c)and the acoustic unit710inFIG.7(a)may be that the acoustic unit730inFIG.7(c)may not be provided with the second acoustic cavity. The structures of the housing731, the acoustic transducer unit732, the first acoustic cavity733, and the first sound guide hole735inFIG.7(c)may be respectively similar to the structures of the housing711, the acoustic transducer712, the first acoustic cavity713, and the first sound guide hole715inFIG.7(a), which are not repeated herein. As shown inFIG.7(c), the acoustic unit730may include the housing731and the acoustic transducer unit732. The magnetic circuit structure of the acoustic transducer unit732may include a magnetic conductive cover (not shown inFIG.7(c)). The magnetic conductive cover may face away from the diaphragm, and a portion of the magnetic conductive cover may be used as a side wall of the housing of the acoustic unit. Here it can be understood that the magnetic conductive cover may be a side wall of the housing731. In some embodiments, the acoustic unit730may include one or more second sound guide holes736. The second sound guide holes736may be located on the magnetic conductive cover. In some embodiments, the shape of the second sound guide hole736may be a regular or irregular shape such as a circle, a semicircle, an ellipse, a triangle, a quadrangle (e.g., a rectangle), or a pentagon. In some embodiments, when there are a plurality of second sound guide holes736, the shapes of the second sound guide holes736may be the same or different. When the user wears the sound-producing device, the first hole part and the second hole part of the first sound guide hole735may face the ear canal opening of the user, and the second sound guide hole736may face away from the user's face area. Here, the sound output from the first sound guide hole735and the sound output from the second sound guide hole736may be approximately vertical to the human face. The sound output from the first sound guide hole735and the sound output from the second sound guide hole736may be reflected by the human face (approximately regarded as a baffle), and the dipole may become a quadrupole, thereby producing a sound radiation directivity diagram similar to that of the dipole. More descriptions regarding the first sound guide hole735and the second sound guide hole736in the acoustic unit730approximately arranged oppositely may be found elsewhere in the present disclosure (e.g.,FIG.10A,FIG.10B,FIG.11and related descriptions thereof).

FIG.7(d)is a schematic structural diagram illustrating another acoustic unit according to some embodiments of the present disclosure. The structure of the acoustic unit740inFIG.7(d)may be substantially the same as that of the acoustic unit710inFIG.7(a). A difference between the acoustic unit740inFIG.7(d)and the acoustic unit710inFIG.7(a)may be that the structure and distribution of the second sound guide hole746of the acoustic unit740inFIG.7(d)may be different from he structure and distribution of the second sound guide hole716of the acoustic unit710inFIG.7(a). The structures of the housing741, the acoustic transducer742, the first acoustic cavity743, the second acoustic cavity744, and the first sound guide hole745inFIG.7(d)may be respectively similar to the structures of the housing711, the acoustic transducer712, the first acoustic cavity713, the second acoustic cavity714, and the first sound guide hole715inFIG.7(a), which are not repeated herein. As shown inFIG.7(d), the second sound guide hole746may be located at a side wall of the housing741opposite to a magnetic conductive plate. The second sound guide hole746may be acoustically coupled with the second acoustic cavity744for outputting sound produced from the back surface of the acoustic unit742. When the user wears the sound-producing device, the first hole part and the second hole part of the first sound guide hole745may face the ear canal opening of the user, and the second sound guide hole746may face away from the user's face area. The sound output from the first sound guide hole745and the sound output from the second sound guide hole746may be reflected by the human face (approximately regarded as a baffle), and the dipole may become a quadrupole, thereby producing a sound radiation directivity diagram similar to that of the dipole.

In order to further illustrate the acoustic output effects of different acoustic units (e.g., the acoustic unit710, the acoustic unit720and the acoustic unit730) inFIG.7, a specific description will be given inFIG.8.FIG.8illustrates frequency response curves of different acoustic units according to some embodiments of the present disclosure. InFIG.8, a solid line (a) may be a frequency response curve of the acoustic unit710inFIG.7(a), a dotted line (b) may be a frequency response curve of the acoustic unit720inFIG.7(b), and a dotted line (c) may be a frequency response curve of the acoustic unit730inFIG.7(c). As shown inFIG.8, the three frequency response curves may have a resonant peak810near 4 kHz. The resonant peak810may be mainly caused by a first acoustic cavity (e.g., the first acoustic cavity713, the first acoustic cavity723, and the first acoustic cavity733) and a first sound guide hole (e.g., the first sound guide hole715, the first sound guide hole725, and the first sound guide hole735). As the structures of the first acoustic cavities and the first sound guide holes of the three acoustic units inFIG.7(a),FIG.7(b)andFIG.7(c)are the same, the resonant peaks of the three frequency response curves near 4 kHz may coincide with each other. In the acoustic unit710inFIG.7(a), due to the structures of the second acoustic cavity714and the second sound guide hole716, the corresponding frequency response curve (a) may have a resonant peak811around 2.6 kHz. In the acoustic unit720inFIG.7(b), due to the structures of the second acoustic cavity724and the second sound guide hole726, the corresponding frequency response curve (b) may have a resonant peak812around 3.2 kHz. In the acoustic unit730inFIG.7(c), as the acoustic unit730has only the second sound guide hole736and has no second acoustic cavity, a resonance frequency of a resonant peak813in the corresponding frequency response curve (c) may be relatively high, and the resonance frequency of the resonant peak813may be around 7 k Hz. It can be seen from the above that in a specific frequency band (e.g., 1000 Hz-10000 Hz), when the acoustic unit has no second acoustic cavity, the frequency response curve of the acoustic unit may be flatter and have a better acoustic output effect. In some embodiments, the resonance frequency corresponding to the resonant peak (e.g., the resonant peak811and the resonant peak812) caused by the second acoustic cavity may be improved by reducing the volume of the second acoustic cavity.

In some embodiments, the first sound guide hole and the second sound guide hole may be arranged oppositely or approximately arranged oppositely. When the user wears the sound-producing device, a connection line between the center of the first sound guide hole and the center of the second sound guide hole may point to the ear canal opening of the user. On one hand, the first sound guide hole and the second sound guide hole may be arranged oppositely or approximately arranged oppositely, and the first sound guide hole may be closer to the ear canal opening of the user, which can ensure that the acoustic unit may provide the user with a relatively large audible volume. On the other hand, the second sound guide hole may face away from the ear canal opening of the user to prevent the sound output from the first sound guide hole and the sound output from the second sound guide hole from interfering at the position of the ear canal opening of the user. Meanwhile, the sound output from the first sound guide hole and the sound output from the second sound guide hole may be approximately regarded as forming a dipole and may be offset in the far field. The positional relationship between the first sound guide hole and the ear canal opening of the user, and the positional relationship between the second sound guide hole and the ear canal opening of the user will be exemplarily described below with reference toFIG.9.

It should be noted that the foregoing one or more embodiments are for illustrative purposes only, and are not intended to limit the structure and shape of the acoustic unit. After fully understanding the principle of the acoustic unit, variations can be made to the acoustic unit to obtain an acoustic unit different from the embodiments of the present disclosure. For example, a portion of the second sound guide hole of the acoustic unit may be located at a corresponding side wall of the second acoustic cavity, and another portion of the second sound guide hole of the acoustic unit may be located at a magnetic conductive cover of a magnetic circuit structure.

FIG.9illustrates distributions of different acoustic units at an ear according to some embodiments of the present disclosure. The acoustic units in diagrams a, b, c and d inFIG.9may correspond to diagrams a, b, c and d inFIG.7, respectively. As shown inFIG.9(a), the first sound guide hole715may be located at a lower right corner of the acoustic unit710, and the second sound guide hole716may be located at an upper left of the acoustic unit710. When the user wears the acoustic unit710, the first hole part7151and the second hole part7152of the first sound guide hole715may be close to the ear canal opening of the user, and the second sound guide hole716may face away from the ear canal opening of the user. A connection line between a center of the first sound guide hole715and a center of the second sound guide hole716may point to the ear canal opening of the user. Here it can be understood that the center of the first sound guide hole715, the center of the second sound guide hole716, and the ear canal opening of the user may be substantially on a same straight line. It should be noted that a center of a sound guide hole here may be a geometric center of the sound guide hole, or a geometric center of an equivalent sound guide hole corresponding to the sound guide hole. For example, inFIG.9(a), the equivalent sound guide hole corresponding to the first sound guide hole715may be regarded as a connection area formed by connecting two ends of the first hole part7151and the second hole part7152with the largest distance. The center of the first sound guide hole715may be the geometric center of the equivalent sound guide hole corresponding to the first sound guide hole. The second sound guide hole716may have a rectangular shape, and the center of the second sound guide hole716may be the geometric center of the rectangle. As another example, inFIG.9(b), the center of the first sound guide hole725may be the geometric center of the equivalent sound guide hole corresponding to the first sound guide hole. The second sound guide hole726may include a third hole part and a fourth hole part. The equivalent sound guide hole corresponding to the second sound guide hole726may be regarded as a connection area formed by connecting two ends of the third hole part and the fourth hole part with the largest distance. The center of the second sound guide hole726may be the center of the equivalent sound guide hole corresponding to the second sound guide hole. As another example, inFIG.9(c), the center of the first sound guide hole735may be the center of the equivalent sound guide hole corresponding to the first sound guide hole. The second sound guide hole736may include a plurality of sub-sound guide holes, and the center of the second sound guide hole736may be a geometric center of the plurality of sub-sound guide holes. As another example, inFIG.9(d), the center of the first sound guide hole745may be the center of the equivalent sound guide hole corresponding to the first sound guide hole. The center of the second sound guide hole746may be a geometric center of the second sound guide hole746.

FIG.10Ais a radiation directivity diagram of the acoustic unit when the first sound guide hole and the second sound guide hole of the acoustic unit inFIG.7(b)are arranged oppositely according to some embodiments of the present disclosure. As shown inFIG.10A, the radiation directivity diagram may be approximately a shape of “8”, where a main lobe direction of the shape of 8 may correspond to the direction of the connection line inFIG.9(b)(see the dotted line inFIG.10A). The darker the color is, the higher the sound pressure level may be. When the user wears the sound-producing device, the human ear may be in a main lobe area (e.g., a main lobe area1010, or a main lobe area1020) of the shape of 8. The sound pressure level of the sound heard by the ear of the user may be the highest, while the sound pressure level of the sound vertical to the main lobe direction may be relatively small. A space vertical to the main lobe direction may face an external space, which may effectively reduce the sound leakage in the space and ensure a certain degree of privacy.

FIG.10Bis a radiation directivity diagram of the acoustic unit without the second acoustic cavity inFIG.7(c). The radiation directivity diagram inFIG.10Bmay be substantially the same as the radiation directivity diagram inFIG.10A. It can be seen that the first sound guide hole735and the second sound guide hole736inFIG.7(c)may not be arranged oppositely in terms of structure. However, due to the existence of a boundary condition (e.g., human face), the sound output from the first sound guide hole735and the sound output from the second sound guide hole736may be acoustically considered to be approximately opposite.

In order to facilitate the understanding of the boundary condition, it is described in conjunction withFIG.11.FIG.11is a schematic diagram illustrating the principle of reflection of a dipole by a face according to some embodiments of the present disclosure. As shown inFIG.11, when the user wears the sound-producing device, the first sound guide hole of the acoustic unit may face the ear canal opening of the user, and the second sound guide hole may face away from the user's face. The sound output from the first sound guide hole may be a sound wave1110, and the sound output from the second sound guide hole may be a sound wave1120. The sound wave1110and the sound wave1120may form dipole-like radiation. The sound radiated to the external environment from the sound wave1110and the sound wave1120may be approximately vertical to the human face. The sound wave1110and the sound wave1120may be reflected by the user's face to form a sound wave1130and a sound wave1140symmetrical to the sound waves1110and the sound waves1120. A dipole formed by the sound wave1110and the sound wave1120may become a quadrupole, thereby producing a sound radiation directivity diagram similar to that of the dipole.

In order to ensure that the acoustic radiation at the first sound guide hole and the acoustic radiation at the second sound guide hole are substantially the same to form the above-mentioned dipole with the shape of 8, in some embodiments, a ratio of a difference between an effective area of the second sound guide hole and an effective area of the first sound guide hole to the effective area of the first sound guide hole or the effective area of the second sound guide hole may be smaller than or equal to 40%. In some embodiments, the ratio of the difference between the effective area of the second sound guide hole and the effective area of the first sound guide hole to the effective area of the first sound guide hole or the effective area of the second sound guide hole may be smaller than or equal to 30%. In some embodiments, the ratio of the difference between the effective area of the second sound guide hole and the effective area of the first sound guide hole to the effective area of the first sound guide hole or the effective area of the second sound guide hole may be smaller than or equal to 20%. In some embodiments, the ratio of the difference between the effective area of the second sound guide hole and the effective area of the first sound guide hole to the effective area of the first sound guide hole or the effective area of the second sound guide hole may be smaller than or equal to 20%. In some embodiments, the effective area of the second sound guide hole and the effective area of the first sound guide hole may be equal. As used herein, an effective area of a sound guide hole may be referred to as a product of an actual area of the sound guide hole and a porosity of an acoustic resistance net covered on the sound guide hole, i.e., an area through which air can pass through the opening. For example, when an outlet end of the sound guide hole is covered by the acoustic resistance net, the effective area of the sound guide hole may be the product of the actual area of the sound guide hole and the porosity of the covered acoustic resistance net. As another example, when an outlet end of a pressure relief hole is not covered with the acoustic resistance net, the effective area of the sound guide hole may be the actual area of the sound guide hole.

FIG.12is a schematic structural diagram illustrating a sound-producing device according to some embodiments of the present disclosure. As shown inFIG.12, the sound-producing device may include a wearing component1210and an acoustic unit1220. The acoustic unit1220may be a cuboid structure. A side of the acoustic unit1220with a relatively small length may be connected with the wearing component1210, and a side of the acoustic unit1220with a relatively large length may be connected with the wearing component1210at an angle, so the first sound guide hole at a lower right corner of the acoustic unit may be closer to the ear canal opening of the user, and the second sound guide hole at an upper left corner of the acoustic unit1220may face away from the ear canal opening. The acoustic unit1220and the wearing component1210may be arranged at an angle. When the user wears the sound-producing device, the first sound guide hole of the acoustic unit1220may be closer to the ear canal opening of the user. In some embodiments, an included angle θ between the side of the acoustic unit1220with a relatively large length and the wearing component1210may be 5°-85°. In some embodiments, an included angle θ may be 10°-70°. In some embodiments, an included angle θ may be 15°-60°. In some embodiments, an included angle θ may be 20°-45°. In some embodiments, an included angle θ may be 30°-90°. In some embodiments, the acoustic unit and the wearing component may be an integrated structure, and the acoustic unit may be located in the wearing component1210.FIG.13is a schematic structural diagram illustrating a wearing component according to some embodiments of the present disclosure.FIG.14AandFIG.14Bare schematic structural diagrams illustrating the wearing component inFIG.13from different viewing angles. Referring toFIG.13,FIG.14AandFIG.14B, the wearing component1300may be provided with a concave segment1320and a connecting segment1310connected with the concave segment1320. The concave segment1320may cause an upper edge of the wearing component1300to have a downward depression on the wearing component1300. In this embodiment, since the concave segment1320is folded, the flexibility of the concave segment1320may be increased. The wearing component1300may adaptively deform according to the shape of the user's head due to the existence of the concave segment1320, thus making the wearing component1300easier for the user to wear. In some embodiments, the concave segment1320may have an acoustic unit (not shown inFIG.13). The concave segment1320may be used to install the acoustic unit and make the acoustic unit close to the ear of the user. The connecting segment1310may be used to connect the concave segment1320with a visual component of the sound-producing device and be erected on the auricle of the user. The concave segment1320may be connected with the connecting segment1310through a physical connection a bonding, an inlaying, a welding, a riveting, a screw connection, a snap connection, etc.

In some embodiments, the concave segment1320may cause the acoustic unit to be located in front of the ear of the user. As used herein, the front of the ear may be referred to as a side of the user's ear facing the user's face. For example, when the user wears the sound-producing device, the concave segment1320may be located on a side of the ear facing the user's eyes, so that the acoustic unit arranged on the concave segment1320may be closer to the ear canal opening of the user, and a sound signal emitted by the acoustic unit may be transmitted to the ear of the user more easily.

In some embodiments, the concave segment1320may be configured in any feasible shape. The shape of the concave segment1320may be understood as a shape of the structure of the concave segment1320or a concave shape of the concave segment1320. Exemplary shapes of the concave segment20may include, but not limited to, a Y shape, a V shape, and a folded shape. Several exemplary concave segments will be described below.

The concave segment1320may include a transition part1321and a mounting part1322connected at an angle. The acoustic unit may be disposed in the mounting part1322. When the wearing component is worn, the transition part1321and the connecting segment1310may be bent and connected and extend downward, so as to extend toward the ear canal opening of the user, to shorten the distance between the acoustic unit disposed therein and the ear canal opening. The transition part1321may refer to a part of the concave segment1320that is closer to the visual component. The mounting part1322may refer to a part of the concave segment1320that is closer to the ear of the user. In some embodiments, the transition part1321and the mounting part1322may have different shapes or the same shape. The mounting part1322and the transition part1321of the concave segment1320may be connected at any angle, thereby forming the concave segment1320of different shapes. Here, the connection between the mounting part1322and the transition part1321of the concave segment1320at any angle may mean that an included angle formed after the connection of the mounting part1322and the transition part1321may be any angle. In some embodiments, an included angle formed between the mounting part1322and the transition part1321may be within a range of 15-150 degrees. In some embodiments, the included angle formed between the mounting part1322and the transition part1321may be within a range of 30-150 degrees. In some embodiments, the included angle formed between the mounting part1322and the transition part1321may be within a range of 45-150 degrees. In some embodiments, the included angle formed between the mounting part1322and the transition part1321may be within a range of 60-150 degrees. In some embodiments, the included angle formed between the mounting part1322and the transition part1321may be within a range of 75-90 degrees. For example, the included angle formed between the mounting part1322and the transition part1321may be 30 degrees, 60 degrees, 90 degrees, or 120 degrees.

In some embodiments, the mounting part1322and the transition part1321may be connected in a detachable manner, such as a screw connection or a plug connection. In some embodiments, the connecting segment1310and the concave segment1320may be fixedly connected. For example, the connecting segment1310and the concave segment1320may be connected by welding, riveting, bonding, etc. In some embodiments, the mounting part1322and the transition part1321may also be directly connected, or connected through an adjusting structure. The adjusting structure may be a hinge, a spherical hinge, or a telescopic rod, etc. The adjusting structure may enable the mounting part1322to rotate or translate relative to the transition part1321. In some embodiments, the mounting part1322and the transition part1321may also be an integrated structure.

As an exemplary illustration, in some embodiments, the concave segment1320may be V-shaped, i.e., the concave shape formed by the mounting part1322and the transition part1321may be V-shaped. One end of the mounting part1322may be connected with a part (e.g., a first connecting segment1312) of the connecting segment1310away from the visual component, and the other end of the mounting part1322may extend downward. An included angle formed between the mounting part1322and the connecting segment1310may be approximately 90 degrees. One end of the transition part1321may be connected with a part (e.g., a second connecting segment1311) of the connecting segment1310close to the visual component, and the other end of the transition part1321may extend toward the tragus of the user and be inclined at a certain angle relative to the connecting segment1310. The mounting part1322and the transition part1321may be connected to form a downward V-shaped depression.

It should be noted that the foregoing one or more embodiments are for illustrative purposes only, and are not intended to limit the shape or quantity of the concave segments1320. After fully understanding the principle of the concave segment1320, variations may be made to the concave segment1320to obtain a concave segment1320different from that in the embodiment of the present disclosure. For example, the shapes of the mounting part1322and the transition part1321may be adjusted, so that the shape of the concave segment1320formed by the mounting part1322and the transition part1321may be U-shaped. In some embodiments, the wearing component1300may include a plurality of concave segments1320with different shapes. For example, the wearing component1300may include two concave segments1320. One of the two concave segments1320may be a V-shaped structure, and the other concave segment1320may be a Y-shaped structure.

In some embodiments, the connecting segment1310may include a first connecting segment1312and a second connecting segment1311. The concave segment1320may be connected between the first connecting segment1312and the second connecting segment1311. The first connecting segment1312may be used to be erected on the auricle. The second connecting segment1311may be used to connect the visual component. In some embodiments, the second connecting segment1311may be connected to one end of the mounting part1322and extend away from the first connecting segment1312in a straight strip shape. The concave segment1320may extend downward relative to the first connecting segment1312and the second connecting segment1311, to form a convex shape and a depression relative to the first connecting segment1312and the second connecting segment1311.

In some application scenarios, when the wearing component1300is erected on the auricle of the user, the concave segment1320may be located at a side of the auricle facing the user's eyes, so that when the user wears the wearing component, the concave segment1320may extend toward the tragus, and the acoustic unit disposed in the concave segment1320may be close to the tragus to be closer to the external auditory canal of the user, thereby shortening the distance between the acoustic unit and the ear of the user, and making it easier to transmit sound to the user.

In some embodiments, the acoustic unit (not shown in the figure) may be located inside the mounting part1322. The mounting part1322may be a hollow housing structure. The mounting part1322may be used as the housing of the acoustic unit. In some embodiments, the diaphragm and the magnetic circuit structure of the acoustic unit may be connected through the voice coil. The magnetic circuit structure may be connected with the mounting part1322. A side of the diaphragm facing away from the magnetic circuit structure may be a front surface of the diaphragm, and the other side of the diaphragm may be a back surface of the diaphragm. The diaphragm may vibrate to radiate sound outwards from the front surface and the back surface of the diaphragm, respectively. In some embodiments, the mounting part1322and the diaphragm may form a first acoustic cavity for radiating sound. The first acoustic cavity and the first sound guide hole1330may be acoustically coupled. The first sound guide hole1330may be located at different side walls of the mounting part1300corresponding to the first acoustic cavity. Further, the first sound guide hole1330may be located at a side wall of the mounting part1322away from the transition part1321. When the user wears the sound-producing device, the first sound guide hole1330may be close to the ear canal opening of the user. In some embodiments, the first sound guide hole1330may include a first hole part1331and a second hole part1332. The first hole part1331may be located at a side wall of the mounting part1322away from the transition part1321, and the second hole part1332may be located at a bottom side wall of the mounting part1322. The first hole part1331and the second hole part1332may be connected.

In some embodiments, the acoustic unit may further include a second sound guide hole1340. The second sound guide hole1340may be used to transport the sound produced from the back surface of the acoustic unit to the external environment. The second sound guide hole1340may be located at different side walls of the mounting part1322corresponding to the second acoustic cavity. The second sound guide hole1340and the second acoustic cavity may be acoustically coupled. In some embodiments, the second sound guide hole1340and the first sound guide hole1330may be arranged oppositely. As used herein, the opposite arrangement may be understood as that an opening orientation of the second sound guide hole1340and an opening orientation of the first sound guide hole1330may be opposite or approximately opposite. The second sound guide hole may include a third hole part1341and a fourth hole part1342. The third hole part1341may be located at a side wall of the mounting part1322close to the transition part1321, and the fourth hole part may be located at a top of the mounting part1322. When the user wears the sound-producing device, the first hole part1331and the second hole part1332of the first sound guide hole1330may face the ear canal opening of the user, and the third hole part1341and the fourth hole part1342of the second sound guide hole1340may face away from the ear canal opening of the user. The sound output from the first sound guide hole1330and the sound output from the second sound guide hole1340may satisfy a specific condition (e.g., a phase difference may be about 180°) to form dipole-like radiation. In the far field, the sound output from the first sound guide hole1330and the sound output from the second sound guide hole1340may be reversely cancelled, thereby reducing the sound leakage volume of the acoustic unit in the far field and preventing the sound output from the acoustic unit being heard by people nearby.

It should be noted that the foregoing one or more embodiments are only for illustrative purposes, and are not intended to limit the positions of the first sound guide hole1330and the second sound guide hole1340. After fully understanding the principle of the opposite arrangement of the first sound guide hole1330and the second sound guide hole1340, variations may be made to the first sound guide hole1330and the second sound guide hole1340to obtain the first sound guide hole1330and the second sound guide hole1340different from those of the embodiments in the present disclosure. For example, the first sound guide hole1330or the second sound guide hole1340may be located at a side wall of the mounting part1322by adjusting the positions of the first sound guide hole1330and the second sound guide hole1340. More descriptions regarding the first sound guide hole1330and the second sound guide hole1340may be found elsewhere in the present disclosure (e.g.,FIG.7(b)and related descriptions thereof).

FIG.15is a schematic structural diagram illustrating a wearing component according to some embodiments of the present disclosure. The overall structure of a wearing component1500inFIG.15may be substantially the same as the overall structure of the wearing component1300inFIG.13,FIG.14AandFIG.14B. A difference between the wearing component1500and the wearing component1300may be that a position of a second sound guide hole1540of the wearing component1500inFIG.15may be different from the position of the second sound guide hole1340of the wearing component1300. A first connecting segment1512, a second connecting segment1511, a transition part1521, a mounting part1522, a first sound guide hole1530, a first hole part1531, and a second hole part1532inFIG.15may be respectively similar to the first connecting segment1312, the second connecting segment1311, the transition part1321, the mounting part1322, the first sound guide hole1330, the first hole part1331, and the second hole part1332inFIG.14AandFIG.14B. A magnetic circuit structure of an acoustic unit may include a magnetic conductive cover (not shown inFIG.15). The magnetic conductive cover may be away from a diaphragm, and a portion of the magnetic conductive cover may be used as a side wall of the mounting part1522. Here it can be understood that the magnetic conductive cover may be a side wall of the mounting part1522. In some embodiments, the mounting part1522may include one or more second sound guide holes1540. The second sound guide holes1540may be located on the magnetic conductive cover. Here, the first sound guide hole1530and the second sound guide hole1540of the acoustic unit may be approximately opposite. When the user wears the sound-producing device, the first sound guide hole1530may face the ear canal of the user, and the second sound guide hole1540may face away from the user's face. It should be noted that a number of the second sound guide holes1540may not be limited to two inFIG.15, but may also be one, three, or four, etc. More descriptions regarding the first sound guide hole1530and the second sound guide hole1540may be found elsewhere in the present disclosure (e.g.,FIG.7(c)and related descriptions thereof).

FIG.16is a schematic structural diagram illustrating another wearing component according to some embodiments of the present disclosure. The wearing component1600inFIG.16may be substantially the same as the wearing component1300inFIG.13,FIG.14AandFIG.14B. A difference may be that a position of a second sound guide hole1640of the wearing component1600inFIG.16may be different. A first connecting segment1612, a second connecting segment1611, a transition part1621, a mounting part1622, a first sound guide hole1630, a first hole part1631, and a second hole part1632inFIG.16may be respectively similar to the first connecting segment1312, the second connecting segment1311, the transition part1321, the mounting part1322, the first sound guide hole1330, the first hole part1331, and the second hole part1332inFIG.14AandFIG.14B. As shown inFIG.16, the second sound guide hole1640may be located on a side wall of the mounting part1622corresponding to a second acoustic cavity. When the user wears the sound-producing device, the first sound guide hole1630may face the ear canal of the user, and the second sound guide hole1640may face away from the user's face. More descriptions regarding the first sound guide hole1630and the second sound guide hole1640may be found elsewhere in the present disclosure (e.g.,FIG.7(d)and related descriptions thereof).

It should be understood that the schematic diagrams inFIG.15andFIG.16are provided for illustrative purposes only, and are not intended to limit the scope of the present disclosure. Those skilled in the art can make various variations and modifications under the guidance of the present disclosure. Such variations and modifications all fall within the scope of protection for the disclosure. In some embodiments, one or more features such as the shape, size, and position of each of the elements in the figure may be adjusted according to actual conditions.

In some embodiments, the resonance frequency corresponding to the formant of the acoustic unit may be reduced by reducing a volume of the second acoustic cavity, thereby improving the acoustic output effect of the acoustic unit. The shape or volume of the second acoustic cavity of the acoustic unit may be related to positions of components (e.g., the diaphragm, and the magnetic circuit structure) of the acoustic transducer in the housing. For example, the second acoustic cavity may be formed between the diaphragm and the housing, and the larger a distance between the diaphragm and a side wall of the housing facing the diaphragm is, the larger the volume of the second acoustic cavity may be. In some embodiments, the volume of the second acoustic cavity may be reduced by reducing the distance between the diaphragm and the housing. In some embodiments, the volume of the second acoustic cavity may also be reduced by adjusting the structure of the housing.

FIG.17is a schematic structural diagram illustrating different acoustic units according to some embodiments of the present disclosure. As shown inFIG.17(a), an acoustic unit1710may include a housing1711and an acoustic transducer1712. In some embodiments, the housing1711may be a hollow cuboid structure. The housing1711may include a convex part17111that protrudes outward relative to a side wall on a side of the housing. The acoustic transducer1712may be configured to convert a signal containing sound information into a sound signal. In some embodiments, the acoustic transducer1712may include a diaphragm and a magnetic circuit structure. The diaphragm and the magnetic circuit structure may be connected through a voice coil. The magnetic circuit structure may be connected with the housing1711. An internal magnetic field of the magnetic circuit structure may change in response to the signal containing the sound (e.g., the electrical signal). The voice coil may vibrate under the action of the magnetic circuit structure. The diaphragm may vibrate in response to the vibration of the voice coil. The diaphragm may drive the air inside the housing1711to vibrate to produce sound waves. In some embodiments, a side of the diaphragm of the acoustic transducer1712facing away from the magnetic circuit structure may be a front surface of the diaphragm, and the other side of the diaphragm may be a back surface of the diaphragm. The diaphragm may vibrate to radiate sound from the front surface and the back surface of the diaphragm, respectively. In some embodiments, the housing1711and the front surface of the diaphragm may form a first acoustic cavity1713for radiating sound. A magnetic conductive cover of the magnetic circuit structure may be used as a complete side wall or a portion of a side wall of the housing1711where the convex part17111is located. The convex part17111may protrude outward relative to the magnetic conductive cover. A second acoustic cavity1714may be formed between the back surface of the diaphragm and the convex part17111. In some embodiments, the acoustic unit1710may further include a first sound guide hole1715. The first sound guide hole1715may be used to output the sound produced at the front surface of the diaphragm toward the ear canal opening of the user. The first sound guide hole1715and the first acoustic cavity1713may be acoustically coupled. Specifically, the first sound guide hole1715may be located on a side wall of the housing1711where the first acoustic cavity1713is located. In order to reduce the sound leakage of the acoustic unit1710, in some embodiments, the acoustic unit1710may further include a second sound guide hole1716. The second sound guide hole1716may be used to transmit the sound produced from the back surface of the diaphragm to the external environment. In some embodiments, the second sound guide hole1716may be located on the magnetic conductive cover. The second sound guide hole1716on the magnetic conductive cover may directly output the sound produced at the back surface of the diaphragm to the outside. In some embodiments, the second sound guide hole1716may also be located on a side wall of the convex part17111corresponding to the second acoustic cavity1714. The sound produced at the back surface of the diaphragm may be transmitted into the second acoustic cavity1714through a hole (not shown in theFIG.17) on the magnetic conductive cover, and then transmitted to the external environment through the second sound guide hole1716disposed on the convex part17111. In some embodiments, shapes and a number of the second sound guide holes on the magnetic conductive cover and shapes and a number of the second sound guide holes on the convex part17111may be the same. In some embodiments, the shape of the second sound guide hole1716may include a rectangle, a circle, a semicircle, an ellipse, a pentagon, a triangle, or other regular or irregular shapes. In some embodiments, the shapes and the number of the second sound guide holes on the magnetic conductive cover and the shapes and the number of the second sound guide holes on the convex part may also be different. For example, inFIG.17(b), the second sound guide hole1726on the magnetic conductive cover may be a rectangle, and the shape of the second sound guide hole1726on the convex part may be a triangle. In some embodiments, an orientation of the second sound guide hole on the magnetic conductive cover and an orientation of the second sound guide hole on the convex part may be the same or different. For example, inFIG.17(a)andFIG.17(b), when side walls of the magnetic conductive cover and the convex part where the second sound guide holes are located are opposite to the diaphragm of the acoustic transducer unit, the orientation of the second sound guide hole on the magnetic conductive cover and the orientation of the second sound guide hole on the convex part may be the same. As another example, inFIG.17(c), the orientation of the second sound guide hole1736on the magnetic conductive cover and the orientation of the second sound guide hole1736on the convex part may be different. It should be noted that the second sound guide holes (e.g., the second sound guide hole1716, the second sound guide hole1726, and the second sound guide hole1736) in the above-mentioned embodiments are only for illustrative purposes only, and the position, quantity, dimension, shape, etc. of each of the second sound guide holes may be adjusted according to the actual application scenarios, as long as the first sound guide hole and the second sound guide hole may be arranged oppositely or the sound output from the first sound guide hole and the sound output from the second sound guide hole may be approximately opposite, which fall within the protection scope of the present disclosure.

It should be noted that different embodiments may have different beneficial effects. In different embodiments, the possible beneficial effects may be any one or a combination of the above, or any other possible beneficial effects.

Having thus described the basic concepts, it may be rather apparent to those skilled in the art after reading this detailed disclosure that the foregoing detailed disclosure is intended to be presented by way of example only and is not limiting. Although not explicitly stated here, those skilled in the art may make various modifications, improvements and amendments to the present disclosure. These alterations, improvements, and modifications are intended to be suggested by this disclosure, and are within the spirit and scope of the exemplary embodiments of this disclosure.

Moreover, certain terminology has been used to describe embodiments of the present disclosure. For example, the terms “one embodiment,” “an embodiment,” and/or “some embodiments” mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present disclosure. Therefore, it is emphasized and should be appreciated that two or more references to “an embodiment” or “one embodiment” or “an alternative embodiment” in various portions of this specification are not necessarily all referring to the same embodiment. In addition, some features, structures, or features in the present disclosure of one or more embodiments may be appropriately combined. Characteristics of one or more embodiments of the present disclosure may be properly combined.

Furthermore, the recited order of processing elements or sequences, or the use of numbers, letters, or other designations therefore, is not intended to limit the claimed processes and methods to any order except as may be specified in the claims. Although the above disclosure discusses through various examples what is currently considered to be a variety of useful embodiments of the disclosure, it is to be understood that such detail is solely for that purpose, and that the appended claims are not limited to the disclosed embodiments, but, on the contrary, are intended to cover modifications and equivalent arrangements that are within the spirit and scope of the disclosed embodiments. For example, although the implementation of various components described above may be embodied in a hardware device, it may also be implemented as a software only solution, e.g., an installation on an existing server or mobile device.

Similarly, it should be appreciated that in the foregoing description of embodiments of the present disclosure, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure aiding in the understanding of one or more of the various embodiments. However, this disclosure does not mean that the present disclosure object requires more features than the features mentioned in the claims. Rather, claimed subject matter may lie in less than all features of a single foregoing disclosed embodiment.

In some embodiments, numbers describing the number of ingredients and attributes are used. It should be understood that such numbers used for the description of the embodiments use the modifier “about”, “approximately”, or “substantially” in some examples. Unless otherwise stated, “about”, “approximately”, or “substantially” indicates that the number is allowed to vary by ±20%. Correspondingly, in some embodiments, the numerical parameters used in the description and claims are approximate values, and the approximate values may be changed according to the required characteristics of individual embodiments. In some embodiments, the numerical parameters should consider the prescribed effective digits and adopt the method of general digit retention. Although the numerical ranges and parameters used to confirm the breadth of the range in some embodiments of the present disclosure are approximate values, in specific embodiments, settings of such numerical values are as accurate as possible within a feasible range

For each patent, patent application, patent application publication, or other materials cited in the present disclosure, such as articles, books, specifications, publications, documents, or the like, the entire contents of which are hereby incorporated into the present disclosure as a reference. The application history documents that are inconsistent or conflict with the content of the present disclosure are excluded, and the documents that restrict the broadest scope of the claims of the present disclosure (currently or later attached to the present disclosure) are also excluded. It should be noted that if there is any inconsistency or conflict between the description, definition, and/or use of terms in the auxiliary materials of the present disclosure and the content of the present disclosure, the description, definition, and/or use of terms in the present disclosure is subject to the present disclosure.

At last, it should be understood that the embodiments described in the present disclosure are merely illustrative of the principles of the embodiments of the present disclosure. Other modifications that may be employed may be within the scope of the present disclosure. Thus, by way of example, but not of limitation, alternative configurations of the embodiments of the present disclosure may be utilized in accordance with the teachings herein. Accordingly, embodiments of the present disclosure are not limited to that precisely as shown and described.