Audio output device

Abstract

The sound output device 100 includes a housing 10, a bone conduction vibrator 11 that generates bone-conducted sound waves and transmits them to the cochlea through the housing 10 to generate sound, an air-conducted vibrator 12 that generates air-conducted sound waves and transmits them to the ear through a sound guide hole in the housing 10, and a processing module that supplies a first audio signal and a second audio signal to the bone conduction vibrator 11 and the air-conducted vibrator 12, respectively, where the first audio signal and the second audio signal have a crossover frequency and include frequency components above and below the crossover frequency, respectively, the crossover frequency being 600 Hz or higher. The device can effectively reduce the power consumption of the entire device, while achieving sufficient volume output and low sound leakage.

Description

[Technical Field]

[0001] [Incorporation by Reference] The present application claims the priority of the Chinese patent application with application No. 202310541798.X filed on May 12, 2023, the entire content of which is incorporated herein by reference.

[0002] The present specification relates to the field of acoustics, and in particular, to an acoustic output device. [Background Art]

[0003] The three aspects of power consumption, volume and sound leakage of an acoustic output device influence and restrict each other. When an acoustic output device outputs a large volume, its power consumption is also large, and the sound leakage effect is also unsatisfactory.

[0004] Therefore, it is necessary to provide an acoustic output device that can effectively reduce the power consumption of the entire device, while achieving sufficient volume output and low sound leakage. [Summary of the Invention]

[0005] An acoustic output device according to an embodiment of the present specification comprises: a housing; a bone conduction vibrator configured to generate bone conduction sound waves, transmit the bone conduction sound waves to the cochlea through the housing and generate sound; an air conduction vibrator configured to generate air conduction sound waves, and transmit the air conduction sound waves to an ear through a sound guide hole on the housing; a processing module configured to respectively provide a first audio signal and a second audio signal to the bone conduction vibrator and the air conduction vibrator, wherein the first audio signal and the second audio signal have a crossover frequency, respectively include a component with a frequency greater than or equal to the crossover frequency and a component with a frequency less than the crossover frequency, and the crossover frequency is greater than or equal to 600Hz.

[0006] In some embodiments, the crossover frequency is greater than or equal to 1500Hz.

[0007] In some embodiments, the housing includes two sound ducts, and the sound radiated into the far field through the two sound ducts is directional, and this directionality is expressed as the difference between the sound pressure level in the direction of the line connecting the two sound ducts and the sound pressure level in at least one other direction being 3 dB or more.

[0008] In some embodiments, the sound emitted from the two sound ducts has an amplitude difference of less than 6 dB and a phase difference of 150° to 210°.

[0009] In some embodiments, the difference in acoustic load between the two sound holes is less than 0.15.

[0010] In some embodiments, the ratio of the surface acoustic loads of the two sound holes is between 0.5 and 3.5.

[0011] In some embodiments, the crossover frequency is 4000 Hz or less.

[0012] In some embodiments, the processing module performs high-pass filtering and low-pass filtering on an electrical signal containing audio information to obtain a first audio signal and a second audio signal.

[0013] In some embodiments, the bone conduction transducer includes a first magnetic circuit, a diaphragm, and a first coil, and the air conduction transducer includes a diaphragm, a second magnetic circuit, and a second coil, and the angle range between the first vibration direction in the first magnetic circuit of the diaphragm and the second vibration direction in the second magnetic circuit of the diaphragm is 80° to 100°.

[0014] In some embodiments, the center of mass of the bone conduction transducer and the center of mass of the air conduction transducer are spaced apart in the first vibration direction.

[0015] In some embodiments, the center of mass of the bone conduction transducer and the center of mass of the air conduction transducer lie on the same plane in the second vibration direction, and the bone conduction transducer and the air conduction transducer rotate relative to each other.

[0016] In some embodiments, the bone conduction transducer includes two diaphragms positioned symmetrically on either side of a first magnetic circuit, with the axes of symmetry between the two diaphragms and the central axis of the air conduction transducer spaced apart in the first vibration direction.

[0017] In some embodiments, the second magnetic circuit of the air conduction transducer is located on the opposite side of the diaphragm from the bone conduction transducer.

[0018] In some embodiments, the housing includes a first sound guide hole and a second sound guide hole, the first sound guide hole being located on the side wall of the housing facing the bottom wall opposite to the diaphragm of the second magnetic circuit, and the second sound guide hole communicating with the front cavity located on the opposite side of the diaphragm from the second magnetic circuit.

[0019] In some embodiments, the acoustic output device further includes an ear hook assembly connected to the housing, and a second sound duct is located on the side wall of the housing away from the ear hook assembly along the extending direction of the ear hook assembly.

[0020] In some embodiments, the second sound port includes two or more second sub-sound ports, and the acoustic output device further includes an ear hook assembly connected to the housing, wherein at least one of the two or more second sub-sound ports is installed on the outer wall of the housing.

[0021] In some embodiments, the diaphragm has a long axis perpendicular to the first vibration direction, and the distance between the lowest point of the bone conduction transducer and the lowest point of the outer opening of the second sound conduit is 1.0 mm or more in the long axis direction.

[0022] In some embodiments, the radius of curvature of the corner formed between the first side wall adjacent to the second sound conduit of the bone conduction transducer and the second side wall adjacent to the diaphragm of the bone conduction transducer is greater than 1.0 mm.

[0023] In some embodiments, the distance between the center point of a corner formed between a first sidewall of the bone conduction transducer proximate to the second sound guide hole and a second sidewall of the bone conduction transducer proximate to the vibrating membrane and the apex of the edge of the vibrating membrane is 1.5 mm or more.

[0024] In some embodiments, the front cavity includes an air flow path communicating with the second sound guide hole, and the minimum cross-sectional area of the air flow path is 5.3 mm 2 or more.

[0025] In some embodiments, the acoustic output device further comprises a microphone, a microphone hole corresponding to the microphone is provided on the housing, and the microphone hole and the second sound guide hole are covered by the same steel mesh.

[0026] In some embodiments, in a worn state, the microphone hole is closer to the ear-hook assembly than the second sound guide hole.

[0027] The present specification is further described by way of exemplary embodiments, and these exemplary embodiments are described in detail with reference to the drawings. These embodiments are not intended to be limiting, and in these embodiments, the same reference numerals denote the same structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] [Figure 1] Fig. 1 is a schematic diagram of an acoustic output device according to some embodiments of the present specification. [Figure 2] Fig. 2 is a schematic structural diagram of a connecting portion between a core assembly and an ear-hook assembly according to some embodiments of the present specification. [Figure 3] Fig. 3 is an exploded perspective view of the core assembly in Fig. 2. [Figure 4] Fig. 4 is a schematic cross-sectional view of a core assembly taken along section line A-A according to some embodiments of the present specification. [Figure 5A] Fig. 5 is a schematic cross-sectional view of a core assembly taken along section line A-A according to some other embodiments of the present specification. [Figure 5B]This is a schematic diagram of a core assembly according to some other embodiments of this specification. [Figure 6] This is a schematic cross-sectional view in the BB cross-sectional direction of a core assembly according to some embodiments of this specification. [Figure 7] This is a schematic cross-sectional view of a second sound conduit according to some embodiments of this specification. [Figure 8] This is a schematic diagram showing the installation position of the second sound conduit according to some embodiments of this specification. [Figure 9] This is a schematic surface view of some of the housings relating to some of the embodiments described herein. [Figure 10] This is a schematic surface view of some of the housings relating to some of the embodiments described herein. [Figure 11] This figure shows the effect of crossover frequency on the power consumption of an acoustic output device in some embodiments of this specification. [Modes for carrying out the invention]

[0029] To more clearly illustrate the technical means of the embodiments of this application, the drawings necessary for describing the embodiments are briefly described below. Clearly, the drawings described below are only a part of the examples or embodiments of this application, and those skilled in the art can apply this application to other similar scenarios based on these drawings without requiring any creative effort. Unless otherwise stated or otherwise evident from the context, the same reference numerals in the figures represent the same structure or operation.

[0030] It should be understood that the terms “system,” “apparatus,” “unit,” and / or “module” as used herein are ways of distinguishing various assemblies, elements, components, parts, or assemblies of different levels. However, other terms may be used in place of the above terms if they can achieve the same purpose.

[0031] As shown in the present application and claims, unless the context explicitly indicates otherwise, terms such as “one,” “one,” “one kind,” and / or “the” do not specifically refer to the singular form, but may include the plural form. Generally, the terms “includes” and “contains” merely indicate the inclusion of clearly identified steps and elements, and these steps and elements are not an exclusive list; the method or apparatus may include other steps or elements.

[0032] Figure 1 is a schematic diagram of an acoustic output device according to some embodiments of this specification.

[0033] Several embodiments of this specification provide an acoustic output device 100. As shown in Figure 1, the acoustic output device 100 includes a core assembly 1, an ear hook assembly 2, and a back-hook assembly 3. In some embodiments, there are two core assemblies 1. The two core assemblies 1 transmit vibrations and / or sound to the user's left and right ears, respectively, and the two core assemblies 1 may be the same or different. For example, a microphone may be installed in one core assembly 1, but not in the other core assembly 1. Also, for example, a button and a corresponding circuit board may be installed in one core assembly 1, but not in the other core assembly 1. The two core assemblies 1 may be the same in the core module (e.g., speaker module). Hereinafter, this specification will describe in detail one of the two core assemblies 1 as an example. There may be two ear hook assemblies 2, which are placed on the user's left and right ears, respectively, to allow the core assembly 1 to be in close contact with the user's face. For example, a battery may be installed in one ear-hook assembly 2, and a control circuit or the like may be installed in the other ear-hook assembly 2. One end of each ear-hook assembly 2 is connected to the core assembly 1, and the other end is connected to the rear-hook assembly 3. The rear-hook assembly 3 connects the two ear-hook assemblies 2 and is wrapped around the back of the user's neck or behind the brain, and the two core assemblies 1 are held on both sides of the user's face, providing a clamping force so that the ear-hook assemblies 2 can be worn more stably on the user's ears.

[0034] In some embodiments, the acoustic output device 100 does not need to include the after-attachment assembly 3, in which case the acoustic output device 100 includes one core assembly 1 and one ear hook assembly 2. The ear hook assembly 2 may have one end connected to the core assembly 1 and the other end extending along the boundary between the user's ear and head. In some embodiments, the ear hook assembly 2 may have an arc-shaped structure that conforms to the user's auricle so that it can be suspended from the user's auricle. For example, the ear hook assembly 2 may have an arc-shaped structure that conforms to the boundary between the user's head and ear so that it can be hung between the user's auricle and head. In some embodiments, the ear hook assembly 2 may have a clamping structure that conforms to the user's auricle so that it can be clamped onto the user's auricle. Exemplarily, the ear hook assembly 2 may include a sequentially connected hook portion and a connecting portion. The connecting portion connects the hook portion and the core assembly 1 such that the acoustic output device 100 is curved in three-dimensional space when it is not worn (i.e., in its natural state). In other words, in three-dimensional space, the hook-shaped portion, the connecting portion, and the core assembly 1 are not on the same plane. With this arrangement, when the acoustic output device 100 is worn, the hook-shaped portion is mainly hooked between the back of the user's ear and the head, and the core assembly 1 is mainly in contact with the front of the user's ear or the user's head, thereby allowing the core assembly 1 and the hook-shaped portion to engage and grip the ear. Exemplarily, the connecting portion extends from the head to the outside of the head and can further cooperate with the hook-shaped portion to provide pressing force to the core assembly 1 toward the front of the ear. Due to the action of the pressing force, the core assembly 1 can be pressed against the user's skin, thereby preventing the acoustic output device 100 from blocking the ear canal when worn.

[0035] In some other embodiments, the acoustic output device 100 may not include the ear-hook assembly 2 and the back-hook assembly 3, but may include other fixed structures (not shown). The core assembly 1 is fixed to the fixed structure, thereby bringing the core assembly 1 into close contact with the user's ears, head, or other parts, and further transmitting air-conducted sound waves and / or bone-conducted sound waves output from the core assembly 1 to the user. For example, the fixed structure may be a head-mounted structure, which connects two left and right core assemblies 1 to form a head-mounted acoustic output device. Alternatively, for example, the fixed structure may be the temple of eyeglasses, and the core assembly may be fixed to the temple of the eyeglasses. Furthermore, for example, the fixed structure may be a helmet, a mask, or the like, and is not specifically limited herein.

[0036] The structure of the core assembly 1 and other components of the acoustic output device 100 will be described below with reference to the drawings.

[0037] Figure 2 is a schematic diagram of the connection between the core assembly and the ear hook assembly according to some embodiments of this specification. Figure 3 is an exploded perspective view of the core assembly in Figure 2. As shown in Figures 2 and 3, the core assembly 1 includes a housing 10, a bone conduction transducer 11, and an air conduction transducer 12.

[0038] In some embodiments, the housing 10 is provided with two separate housing cavities 1001 and 1002, with the airtightness of housing cavity 1001 being higher than that of housing cavity 1002. The bone conduction transducer 11 is installed in housing cavity 1001, and the air conduction transducer 12 is installed in housing cavity 1002. In the acoustic output device 100, the bone conduction transducer 11 and the air conduction transducer 12 operate together. The air conduction transducer 12 generates air conduction sound waves, which are transmitted to the user's ear (or ear canal) via a sound guide hole (e.g., first sound guide hole 1080) on the housing 10, allowing the user to receive air conduction sound. The bone conduction transducer 11 generates bone conduction sound waves, which are transmitted to the user's cochlea via the housing 10, generating bone conduction sound. In some embodiments, the housing cavity 1001 is installed as a completely sealed housing cavity, and the housing cavity 1002 is installed as a housing cavity that ensures high sealing performance of the air conduction transducer 12 under sound generation conditions. By installing the bone conduction transducer 11 and the air conduction transducer 12 independently using the above method, the sealing effect of the bone conduction transducer 11 can be effectively improved, preventing the bone conduction transducer 11 from being corroded and damaged by external environmental factors, while also ensuring the sound quality effect of the air conduction transducer 12. Furthermore, in the acoustic output device 100, when both the bone conduction transducer 11 and the air conduction transducer 12 are operating, the bone conduction transducer 11 and the air conduction transducer 12 are installed in the housing cavity 1001 and housing cavity 1002, respectively. This effectively prevents mutual interference between the bone conduction transducer 11 and the air conduction transducer 12 (for example, mutual interference between vibrations generated by the bone conduction transducer 11 and vibrations generated by the air conduction transducer 12), thereby effectively improving the sound quality of the acoustic output device 100.

[0039] In some embodiments, as subsequently shown in Figures 2 and 3, the housing 10 includes a first housing 101, a second housing 102, and a third housing 103. The first housing 101 and the second housing 102 engage with each other to form a housing cavity 1001. The first housing 101 and / or the second housing 102 further form a portion of the housing cavity 1002, and the third housing 103 and the first housing 101 and / or the second housing 102 engage with each other to form another portion of the housing cavity 1002. In some embodiments, the housing 10 is formed by the engagement of a first housing 101, a second housing 102, and a third housing 103, the first housing 101 and the second housing 102 engaging to form a housing cavity 1001, the first housing 101 may have a portion of the housing cavity 1002 installed in it, and the third housing 103 and the first housing 101 engaging to form another portion of the housing cavity 1002. The housing 10 is formed by the engagement of the first housing 101, the second housing 102, and the third housing 103 in the above structure, which makes the structure of the core assembly 1 compact, facilitates the assembly of the core assembly 1, and improves the assembly efficiency of the core assembly 1. In some embodiments, a portion of the housing cavity 1002 may be installed in the second housing 102, and the third housing 103 and the second housing 102 may engage with each other to form another portion of the housing cavity 1002; or the first housing 101 and the second housing 102 may engage with each other to form a portion of the housing cavity 1002, and the third housing 103, the first housing 101, and the second housing 102 may engage with each other to form another portion of the housing cavity 1002. Any of the housings 10 realized in the above embodiment can make the structure of the core assembly 1 compact, facilitate the assembly of the core assembly 1, and improve the assembly efficiency of the core assembly 1.

[0040] In some embodiments, a partition wall 1012 is installed within the housing 10, separating the housing cavity 1001 and the housing cavity 1002. In some embodiments, the partition wall 1012 may be installed in the first housing 101 and / or the second housing 102, so that the first housing 101 and the second housing 102 engage with each other to form the housing cavity 1001, the first housing 101 and / or the second housing 102 further form a part of the housing cavity 1002, and the third housing 103 and the first housing 101 and / or the second housing 102 engage to form another part of the housing cavity 1002. Installing the partition wall 1012 in the first housing 101 and / or the second housing 102 can be understood as the partition wall 1012 being a part of the first housing 101 and / or the second housing 102. The first housing 101 and / or the second housing 102 further form part of the housing cavity 1002, and the third housing 103 and the first housing 101 and / or the second housing 102 engage to form another part of the housing cavity 1002. The installation method of the partition wall 1012 is not limited to being installed on the first housing 101 and / or the second housing 102, and in other embodiments, the partition wall 1012 may be a member independent of the first housing 101 and / or the second housing 102.In some embodiments, the partition wall 1012 is installed in the first housing 101, and the first housing 101 is installed in the sub-accommodation cavities 1010 and 1011 located on opposite sides of the partition wall 1012, the opening direction of sub-accommodation cavity 1010 is installed along the wall surface of the partition wall 1012, and the opening direction of sub-accommodation cavity 1011 is installed intersecting the wall surface of the partition wall 1012, and the second housing 102 is installed in the sub-accommodation cavity 1 A sub-storage cavity 1020 is installed, and the second housing 102 is fitted over the open end of the sub-storage cavity 1010, and the sub-storage cavity 1020 and the sub-storage cavity 1010 engage to form a storage cavity 1001. A sub-storage cavity 1030 is installed in the third housing 103, and the third housing 103 is fitted over the open end of the sub-storage cavity 1011, and the sub-storage cavity 1030 and the sub-storage cavity 1011 engage to form a storage cavity 1002.

[0041] The acoustic output of the acoustic output device 100 includes air-conducted sound waves and bone-conducted sound waves. The acoustic output device 100 outputs air-conducted sound waves near the user's ears, allowing the user to hear the sound, while also radiating sound into the surrounding environment, resulting in significant sound leakage from the acoustic output device 100. In application scenarios for the acoustic output device 100, increasing the output volume of the acoustic output device 100 allows the user to hear louder sounds, but it also increases the volume of sound radiated into the surrounding environment, thus increasing sound leakage from the acoustic output device 100. Furthermore, if the vibration amplitude of the bone-conducted transducer 11 and the air-conducted transducer 12 is increased in conjunction with the increase in the output volume of the acoustic output device 100, the power consumption of the acoustic output device 100 increases. The bone-conducted transducer 11 generates bone-conducted sound by pressing against a physical load (e.g., the second housing 102, the user's tissue, skeleton, etc.), and the air-conducted transducer 12 generates air-conducted sound by pressing against an air load. In the low-frequency range, the load required for the bone conduction transducer 11 to generate sound is greater than the load required for the air conduction transducer 12. Under the same conditions for increasing the output volume, the air conduction transducer 12 consumes less power than the bone conduction transducer 11. Therefore, in order to increase the output volume of the acoustic output device 100 while reducing its power consumption, the air conduction transducer 12 can output more low-frequency sound, causing the frequency band of the sound output by the bone conduction transducer 11 to cover less of the low-frequency range or to move away from the low-frequency range. For example, in the low-frequency range (e.g., 20Hz to 1000Hz), air conduction sound waves can be output instead of bone conduction sound waves to reduce the power consumption of the acoustic output device 100. However, if the acoustic output device 100 simultaneously outputs air conduction sound waves in the high-frequency range (e.g., 1000Hz to 5000Hz), the sound leakage from the acoustic output device 100 in the far field will increase (for example, as explained below, in the high-frequency range, the directivity of the air conduction sound waves output by the acoustic output device 100 in the far field decreases, and the sound leakage reduction capability decreases), thus affecting the overall sound quality of the sound radiated by the acoustic output device 100. Therefore, in the high-frequency range, the overall sound quality of the sound radiated by the acoustic output device 100 can be improved by outputting air conduction sound waves instead of bone conduction sound waves.By installing it in this manner, the power consumption of the sound output device 100 can be significantly improved, and even when the output volume of the sound output device 100 is high, its power consumption can be maintained at a good level (see Figure 11 and its explanation for details). Furthermore, by adjusting the frequency range of the air-conducted sound waves, the sound quality of the sound output device 100 can be adjusted to meet the user's needs.

[0042] In some embodiments, to adjust the frequency range of bone conduction and air conduction sound waves, the acoustic output device 100 further includes a processing module (not shown) that supplies a first audio signal and a second audio signal to the bone conduction transducer 11 and the air conduction transducer 12, respectively. Specifically, the acoustic output device 100 converts the original audio signal, i.e., an electrical signal containing speech information, into sound waves that can be received by the user and outputs it. The processing module performs signal processing on the original audio signal to obtain the first and second audio signals. The bone conduction transducer 11 vibrates in response to the first audio signal to generate bone conduction sound waves, and the air conduction transducer 12 vibrates in response to the second audio signal to generate air conduction sound waves. The signal processing here includes, but is not limited to, at least one of signal amplification, phase adjustment, and filtering. In some embodiments, the processing module can process the original audio signal by hardware, software (algorithms), or a combination thereof. For example, the processing module can amplify a signal by amplification circuits and / or algorithms. In some embodiments, the hardware may include, but is not limited to, an equalizer (EQ), a dynamic range controller (DRC), a phase processor (GAIN), and the like. In some embodiments, the processing module may be located inside at least one of the two core assemblies 1 and the two earhook assemblies 2.

[0043] In some embodiments, the first audio signal and the second audio signal have a crossover frequency. In this application, the crossover frequency refers to the frequency domain intersection of the first audio signal and the second audio signal, which are output to the bone conduction transducer 11 and the air conduction transducer 12, respectively, after being processed by the processing module. The first audio signal includes a first frequency band (e.g., 500 Hz to 5 kHz), and the first frequency band includes frequency components whose frequencies are greater than or equal to the crossover frequency. The second audio signal includes a second frequency band (e.g., 20 Hz to 500 Hz), and the second frequency band includes frequency components whose frequencies are less than or equal to the crossover frequency.

[0044] In this application, the crossover frequency is determined by connecting lead wires connected in parallel to the input terminals of the bone conduction transducer 11 and the air conduction transducer 12 to the output terminal of the processing module, recording two sets of electrical signals using a sound card and Audition software, converting them to the frequency domain, and the intersection point of the curves corresponding to the frequency domain of the two sets of electrical signals is the crossover frequency of the two sets of electrical signals.

[0045] In some embodiments, based on the crossover frequency, the processing module can determine the components of the original audio signal whose frequencies fall within a first frequency band, i.e., the first audio signal, and the components whose frequencies fall within a second frequency band, i.e., the second audio signal. The bone conduction transducer 11 vibrates in response to the first audio signal to generate bone conduction sound waves within the first frequency band, and the air conduction transducer 12 vibrates in response to the second audio signal to generate air conduction sound waves within the second frequency band.

[0046] In the present specification, outputting low-frequency band (e.g., second frequency band) sound in the form of air-conducted sound waves helps to reduce the power consumption of the acoustic output device 100, and because sound leakage in the low-frequency band (e.g., second frequency band) is difficult for the human ear to hear, it has little impact on the user's listening and listening privacy. Outputting high-frequency band (e.g., first frequency band) sound in the form of bone-conducted sound waves and transmitting it through the user's tissue / skeleton can improve the sound quality of the output sound of the acoustic output device 100.

[0047] In some embodiments, the processing module can obtain a first audio signal by applying a high-pass filter to the original audio signal, and obtain a second audio signal by applying a low-pass filter to the original audio signal. In some embodiments, the processing module includes a high-pass filter and a low-pass filter. The processing module applies a high-pass filter and a low-pass filter to the original audio signal using the high-pass filter and the low-pass filter.

[0048] In some embodiments, the cutoff frequency of the low-pass filter may be the same as the cutoff frequency of the high-pass filter. After the original audio signal undergoes low-pass filtering, the portion above the cutoff frequency, i.e., the crossover frequency, is removed, and the low-frequency components below the cutoff frequency (i.e., the second audio signal) are mainly retained. Similarly, after the original audio signal undergoes high-pass filtering, the portion below the cutoff frequency, i.e., the crossover frequency, is removed, and the high-frequency components above the cutoff frequency (i.e., the first audio signal) are mainly retained. In some embodiments, the cutoff frequency of the low-pass filter may be different from the cutoff frequency of the high-pass filter, in which case the crossover frequency is the frequency domain intersection of the first audio signal and the second audio signal output to the bone conduction transducer and the air conduction transducer.

[0049] In some embodiments, the original audio signal may be a specific audio signal. The specific audio signal may include audio signals in the internal memory of the sound output device 100 or in a device that is communicated with an external device. For example, the audio signal in the internal memory of the sound output device 100 may include a white noise signal, a pure tone signal, a pulse signal, a narrowband noise, a narrowband warble tone, a modulated tone, and / or a sweep audio signal.

[0050] In some embodiments, the crossover frequency may be 600Hz or higher in order to output more of the sound output of the sound output device 100 in the form of air-conducted sound waves, further reducing its power consumption, and ensuring low sound leakage within the frequency range sensitive to the human ear. For example, the crossover frequency may be 600Hz, 800Hz, 1kHz, 1.2kHz, 1.5kHz, 2kHz, 2.5kHz, 3kHz, 3.5kHz, 4kHz, etc.

[0051] In some embodiments of this specification, by setting a high crossover frequency, the acoustic output of the acoustic output device 100 is output more in the form of air-conducted sound waves, and because the air load pushed by the air-conducting transducer 12 is small, power consumption can be effectively reduced, and it is possible to ensure that the acoustic output device 100 has a long duration even at high volume levels.

[0052] In some embodiments, to further reduce the power consumption of the sound output device 100, a higher crossover frequency can be set, allowing the sound output of the sound output device 100 to be output in the form of air-conducted sound waves. In some embodiments, the crossover frequency is 1 kHz or higher. In some embodiments, the crossover frequency is 1.5 kHz or higher.

[0053] In some embodiments of this specification, by setting a higher crossover frequency, the acoustic output of the acoustic output device 100 can be output more in the form of air-conducted sound waves, and its power consumption can be further reduced (see Figure 11 and its description for details).

[0054] In some embodiments, a higher crossover frequency can be set to further reduce the power consumption of the sound output device 100, for example, a crossover frequency of 2 kHz or higher. However, in this case, since the human ear is sensitive to sounds lower than the crossover frequency, the higher the crossover frequency, the lower the directivity of air-conducted sound in the far field. This can lead to increased sound leakage from the sound output device 100, potentially affecting the user's listening experience and privacy.

[0055] Therefore, in some embodiments, in order to reduce sound leakage from the acoustic output device 100, the housing 10 of the acoustic output device 100 (e.g., a first housing 101, a second housing 102, and / or a third housing 103) may include two sound ducts, for example, a first sound duct 1080 and a second sound duct 1081, as shown in Figure 6. The first sound duct 1080 transmits and outputs air-conducted sound waves generated by the air-conducting transducer 12, and the second sound duct 1081 depressurizes the air-conducting transducer 12, ensuring that the air-conducting transducer 12 operates normally and stably. The air-conducting transducer 12 can radiate sound with a phase difference to the outside through the two sound ducts. In some embodiments, the air-conducting transducer 12 can radiate sound with a phase difference to the outside through the two sound ducts, having equal (or substantially equal) amplitude and opposite (or substantially opposite) phase. The first sound guide hole 1080 and the second sound guide hole 1081 can form a dipole or dipole-like output structure, which can form a directional radiated sound field similar to the shape of the number "8". In the straight line direction where the line connecting the first sound guide hole 1080 and the second sound guide hole 1081 is located, the sound radiated from the sound guide hole is loudest, and the sound radiated in other directions is significantly quieter. Therefore, by installing at least two sound guide holes in the acoustic output device to form a dipole or dipole-like structure, the sound radiated from the acoustic output device to the surrounding environment (i.e., sound leakage in the far field) can be reduced.

[0056] In some embodiments, the first sound port 1080 and the second sound port 1081 can form a dipole or dipole-like structure to improve the sound leakage reduction capability of the sound output device. This can be achieved by making the amplitude difference of the sound radiated from the two sound ports less than 6 dB (for example, an amplitude difference of 1 dB, 3 dB, 5 dB, etc.) and the phase difference of the sound radiated from the two sound ports within the range of 150° to 210°. In some embodiments, to make the dipole-like structure formed by the first sound port 1080 and the second sound port 1081 more typical, the sound radiated from the two sound ports has an amplitude difference of less than 5 dB and a phase difference of 160° to 200°. In some embodiments, the sound radiated from the two sound ports has an amplitude difference of less than 3 dB and a phase difference of 170° to 190°. In some embodiments, the sound emitted from the two sound ducts has an amplitude difference of less than 3 dB and a phase difference of 175° to 185°. In some embodiments, the amplitude difference of the sound emitted from the two sound ducts is less than 6 dB, so the near-field sound pressure level difference between the two sound ducts can be made less than 6 dB. As can be seen, the smaller the near-field sound pressure level difference, the more pronounced the sound waves with the same amplitude but opposite phase in the far field cancel each other out, resulting in a greater effect in reducing sound leakage.

[0057] In this specification, the near-field sound pressure level difference refers to the difference in sound pressure levels of sound radiated from each of the two sound ducts to a near-field position. In this application, the near-field position of a sound duct may refer to a position within 5 mm of the sound duct. For ease of understanding, the near-field sound pressure level difference can be expressed as the difference in sound pressure levels at the two sound ducts of the acoustic output device 100.

[0058] In some embodiments, the near-field sound pressure level test method may involve measuring the sound pressure of sounds (first and second sounds, respectively) radiated from two sound ducts at a specific frequency point (e.g., 1000 Hz), and calculating the sound pressure level difference between the first and second sounds (e.g., by taking the common logarithm of the ratio of the measured sound pressure to the reference sound pressure and then multiplying by 20 to obtain the sound pressure level). In some embodiments, when testing the sound from one sound duct, a barrier can be used to separate the two sound ducts to avoid interference from another sound duct. The sound pressure at a sound duct can be understood as the sound pressure at a location adjacent to that sound duct. For example, a sound collection device may be installed 4 mm away from the sound duct to collect the sound as the sound pressure at that sound duct.

[0059] In some embodiments, when testing the sound from two sound ducts, the collection positions (i.e., locations 4 cm away from each of the two sound ducts) may be in opposite directions from the acoustic output device 100 (for example, the location 4 cm away from the first sound duct is in the direction from the second sound duct towards the first sound duct, and the location 4 cm away from the second sound duct is in the direction from the first sound duct towards the second sound duct). The sound collection device is installed at each of the two collection positions to collect the sound pressure level of the acoustic output device 100, and the difference between the two sound pressure levels, i.e., the near-field sound pressure level difference between the two sound ducts, is calculated.

[0060] In some embodiments of this specification, by controlling the near-field sound pressure of the sound radiated from the two sound ducts to be close together, it is possible to ensure that the first and second sound ducts effectively interfere with and cancel each other out in a specific direction in the far field, thereby effectively reducing sound leakage in the far field from the sound output device 100.

[0061] The near-field sound pressure level difference can be adjusted in various ways. In some embodiments, the near-field sound pressure level difference may be adjusted by adjusting the ratio of the opening areas of the two sound ducts.

[0062] The open area ratio refers to the ratio of the area S1 of one sound hole to the area S2 of another sound hole; that is, the open area ratio is S1 / S2.

[0063] In some embodiments, the ratio of the opening areas of the two sound holes (i.e., the opening area ratio) may be 0.2, 0.5, 1, 1.5, 2, 2.5, etc. In some embodiments, the range of the ratio of the opening areas of the two sound holes may be 0.5 to 2. By controlling the range of the ratio of the opening areas of the two sound holes, the opening areas of the two sound holes can be made closer, and the acoustic resistances of the two sound holes can be made closer, thereby reducing the near-field sound pressure level difference between the two sound holes, and furthermore, the far-field sound leakage can be more significantly canceled out, improving the effect of reducing far-field sound leakage.

[0064] Furthermore, the ratio of the opening areas of the two sound guide holes may be in the range of 0.8 to 1.25, 0.9 to 1.1, or 0.95 to 1.1. By further reducing the range of the ratio of the opening areas of the two sound guide holes, the near-field sound pressure level difference can be reduced, and the effect of reducing far-field sound leakage can be further improved.

[0065] In some embodiments, the near-field sound pressure level difference may be adjusted by adjusting the difference in acoustic load between the two sound ducts. Acoustic load refers to the ratio of the sound pressure value P1 after passing through the sound duct to the sound pressure value P0 that does not pass through the sound duct; that is, the acoustic load is P1 / P0. Note that for a given sound duct, the larger the acoustic load (or the closer it is to 1), the smaller the acoustic resistance.

[0066] In some embodiments, the acoustic load of a sound conduit can be determined by measuring the sound pressure value when the sound conduit is covered with mesh (corresponding to P1) and when it is not covered with mesh (corresponding to P0) at a specific distance, and calculating the ratio of P1 to P0. Specifically, when testing the sound of a sound conduit, a sound collection device can be placed 4-5 mm away from the sound conduit, and then the sound pressure value when the sound conduit is covered with mesh (corresponding to P1) and when it is not covered with mesh (corresponding to P0) can be collected, and finally the acoustic load of the sound conduit can be calculated. The test signal for the acoustic load may be a single frequency signal, and one or more frequency points may be selected from among them, including but not limited to 100Hz, 200Hz, 300Hz, 500Hz, 1000Hz, 2000Hz, 5000Hz and the resonant frequency of the sound output device 100, and the test signal may be white noise, pink noise, or a sweep signal. In some embodiments, it is necessary to first convert the measured sound pressure level into a sound pressure value, and then calculate the acoustic load. Alternatively, the difference in sound pressure levels obtained by measuring before and after the sound port is covered with mesh may be calculated, and the acoustic load value of the sound port may be calculated inversely using a logarithmic formula.

[0067] In some embodiments, the difference in acoustic load between the two sound holes may include values ​​such as 0.1, 0.15, and 0.2. In some embodiments, the difference in acoustic load between the two sound holes may be less than 0.15. As can be understood, the smaller the difference in acoustic load between the two sound holes, the closer the acoustic resistances of the two sound holes become, thereby reducing the near-field sound pressure level difference between the two sound holes, and further enhancing the effect of reducing far-field sound leakage.

[0068] Furthermore, the difference in acoustic load between the two sound ducts may be less than 0.1. By further reducing the range of the difference in acoustic load between the two sound ducts, the difference in near-field sound pressure levels between the two sound ducts can be further reduced, thereby further improving the effect of reducing far-field sound leakage. In order to reduce the power consumption of the acoustic output device 100, the crossover frequency can be shifted to a higher frequency. When the crossover frequency is shifted to a higher frequency, that is, when the air-conducted sound waves output by the acoustic output device 100 contain more high-frequency components, the far-field sound leakage of the acoustic output device 100 gradually increases. Therefore, when the crossover frequency is shifted to a higher frequency, the difference in acoustic load between the two sound ducts can be reduced, further improving the effect of reducing far-field sound leakage and ensuring the output performance of the acoustic output device 100.

[0069] In some embodiments, the crossover frequency can be set to 600Hz to 1kHz in order to reduce the power consumption of the sound output device 100. In this case, the difference in acoustic load between the two sound guide holes may be 0 to 0.12 in order to reduce sound leakage from the sound output device 100 in the far field. In some embodiments, the crossover frequency can be set to 1kHz to 1.5kHz in order to further reduce the power consumption of the sound output device 100. In this case, the difference in acoustic load between the two sound guide holes may be 0 to 0.1 in order to reduce sound leakage from the sound output device 100 (or air conduction transducer 12) in the far field. In some embodiments, the crossover frequency can be set to 1.5kHz to 2.5kHz in order to further reduce the power consumption of the sound output device 100. In this case, the difference in acoustic load between the two sound guide holes may be 0 to 0.07 in order to reduce sound leakage from the sound output device 100 (or air conduction transducer 12) in the far field. In some embodiments, the crossover frequency can be set to a range of 2.5kHz to 4kHz in order to reduce the power consumption of the acoustic output device 100. In this case, the difference in acoustic load between the two sound guide holes may be 0 to 0.05 in order to reduce sound leakage from the acoustic output device 100 (or air conduction transducer 12) in the far field.

[0070] In some embodiments, the near-field sound pressure level difference may be adjusted by adjusting the ratio of the surface acoustic loads of the two sound holes.

[0071] Surface acoustic load refers to the product of the ratio of the sound pressure value P1 after passing through the sound duct to the sound pressure value P0 that does not pass through the sound duct, and the area S of the sound duct; in other words, the surface acoustic load is S × P1 / P0.

[0072] In some embodiments, the ratio of the surface acoustic loads of the two sound holes may be 0.5, 1, 2.5, etc. In some embodiments, the range of the ratio of the surface acoustic loads of the two sound holes may be 0.5 to 3.5. By adjusting the ratio of the surface acoustic loads of the two sound holes and maintaining it within an appropriate range, the acoustic resistances of the two sound holes can be made closer, thereby reducing the near-field sound pressure level difference between the two sound holes and improving the effect of reducing far-field sound leakage.

[0073] Furthermore, the ratio of the surface acoustic loads of the two sound guide holes may be in the range of 0.8 to 2. As can be understood, by further reducing the range of the ratio of the surface acoustic loads of the two sound guide holes, the effect of reducing far-field sound leakage can be made more pronounced. In order to reduce the power consumption of the acoustic output device 100, the crossover frequency can be shifted to a higher frequency. When the crossover frequency is shifted to a higher frequency, that is, when the air-conducted sound waves output by the acoustic output device 100 contain more high-frequency components, the far-field sound leakage of the acoustic output device 100 gradually increases. Therefore, when the crossover frequency is shifted to a higher frequency, the ratio of the surface acoustic loads of the two sound guide holes can be reduced to further improve the effect of reducing far-field sound leakage and ensure the output performance of the acoustic output device 100.

[0074] In some embodiments, the crossover frequency can be set to 600Hz to 1kHz in order to reduce the power consumption of the sound output device 100. In this case, the range of the ratio of the surface acoustic loads of the two sound guide holes may be 0.5 to 3.5 in order to reduce sound leakage of the sound output device 100 in the far field. In some embodiments, the crossover frequency can be set to 1kHz to 1.5kHz in order to further reduce the power consumption of the sound output device 100. In this case, the range of the ratio of the surface acoustic loads of the two sound guide holes may be 0.6 to 2.7 in order to reduce sound leakage of the sound output device 100 (or air conduction transducer 12) in the far field. In some embodiments, the crossover frequency can be set to 1.5kHz to 2.5kHz in order to further reduce the power consumption of the sound output device 100. In this case, the range of the ratio of the surface acoustic loads of the two sound guide holes may be 0.7 to 2 in order to reduce sound leakage of the sound output device 100 (or air conduction transducer 12) in the far field. In some embodiments, the crossover frequency can be set to a range of 2.5 kHz to 4 kHz in order to reduce the power consumption of the acoustic output device 100. In this case, the ratio of the surface acoustic loads of the two sound guide holes may be in the range of 0.9 to 1.2 in order to reduce sound leakage in the far field from the acoustic output device 100 (or air conduction transducer 12).

[0075] In some embodiments of this specification, by adjusting the range of the difference in acoustic load between two sound holes and / or the ratio of surface acoustic loads, the acoustic resistances of the two sound holes can be made closer, thereby reducing the near-field sound pressure level difference between the two sound holes, making the configured dipole or dipole-like sound field more directional in the far field and further improving the effect of reducing sound leakage in the far field.

[0076] In some embodiments, in order to further reduce sound leakage in the far field from the acoustic output device 100, the first sound port 1080 and the second sound port 1081 can further adjust the dipole or dipole-like radiated sound field by radiating sound with a phase difference and / or amplitude difference to the outside. Specifically, by adjusting the phase difference between two sound outputs from the two sound ports of the acoustic output device 100, the degree of cancellation of the sound outputs from the acoustic output device 100 in the far field can be changed, and when the phase difference satisfies certain conditions, the acoustic output device 100 can maintain a high volume output in a certain direction (for example, towards the direction where the user's ear canal is located) while suppressing sound leakage in the opposite direction from the acoustic output device 100. As a result, the sound radiated to the outside by the first sound port 1080 and the second sound port 1081 has high directivity in the radiating space. High directivity can also be described as the sound emitted from the two sound ports having a far-field sound pressure level difference of 3 dB or more in at least one opposite direction (for example, the direction in which the ear canal is located and the opposite direction). This allows for a higher volume in the direction in which the user's ear canal is located, while reducing sound leakage in the opposite direction and in other directions, and further allows for a better balance between ear canal openness and listening privacy.

[0077] The far-field sound pressure level difference refers to the difference in sound pressure levels of the sound radiated in the far field from each of the two sound ducts. In this application, the far field of the sound duct may refer to a position other than 10 cm from the sound duct. For ease of understanding, the far-field sound pressure level difference of two sound ducts can be expressed as the difference in sound pressure levels at the same or approximately the same distance (or symmetrical position) from each of the two ducts in the direction of the line connecting the two sound ducts. The test method for the far-field sound pressure level difference is similar to the test method for the near-field sound pressure level difference, and the similarities will not be explained. The difference is that when measuring the far-field sound pressure level, for example, when collecting sound from the first sound duct 1080 (or the second sound duct 1081), the sound collection device can be installed at a position 30 cm away from the first sound duct 1080 (or the second sound duct 1081) for collection.

[0078] In some embodiments, the difference in far-field sound pressure levels between two sound ducts can be adjusted by setting the amplitude difference and phase difference of the sound emitted from the two sound ducts.

[0079] In addition, the phase of the sound emitted from the sound holes (including the first sound hole 1080 and the second sound hole 1081) described in the embodiments of this specification may refer to the phase measured at a position 4 mm away from the sound hole (or the geometric center of the sound hole) (for example, 4 mm in front of the sound hole). In some embodiments, the phase difference test method may involve measuring the phase of the sound emitted from the two sound holes (first sound and second sound, respectively) and then calculating the phase difference between the first sound and the second sound. When testing the sound from the first sound hole 1080 (or the second sound hole 1081), a barrier can be used to separate the first sound hole 1080 and the second sound hole 1081 to avoid the second sound hole 1081 (or the first sound hole 1080) interfering with the test. Furthermore, the sound collection device can be positioned on the line connecting the first sound guide hole 1080 and the second sound guide hole 1081, and the first sound can be collected at a position 4 mm away from the first sound guide hole 1080 (or the second sound guide hole 1081), further avoiding interference from the second sound guide hole 1081 (or the first sound guide hole 1080) during the test. For illustrative purposes only, the dimensions of the barrier may be standard dimensions. For example, the length, width, and height of the barrier may be 1650 mm, 1350 mm, and 30 mm, respectively. If there are two or more first sound guide holes 1080 (or second sound guide holes 1081), one of them may be selected for testing. For example, one first sound guide hole 1080 and one second sound guide hole 1081 at specific relative positions (e.g., minimum or maximum relative distance) can be selected, and the phase of the sound emitted from each of them can be tested, and the phase difference can be calculated. Furthermore, audio measurements within a specific frequency band (e.g., 1000Hz to 8000Hz) do not necessarily need to be exhaustive. By setting up multiple frequency sampling points (e.g., 20 to 30) with equal step sizes and endpoints that are at the frequency band endpoints, the audio at each sampling point can be measured individually.

[0080] In some embodiments of this specification, by setting a high crossover frequency, the majority of the acoustic output of the acoustic output device 100 is output in the form of air-conducted sound waves by the air-conducting transducer 12, thereby significantly reducing its power consumption. Furthermore, by using a dipole (two sound-conducting holes) output structure to reduce sound leakage, the acoustic output device 100 is guaranteed to have low power consumption while also having high sound leakage reduction capability at medium to low frequencies (e.g., 20Hz to 2.5kHz) and overall low sound leakage.

[0081] When the crossover frequency is greater than a certain frequency, the air-conducted sound waves near the crossover frequency have high-frequency components. Within the high-frequency band, the influence of the sound emission characteristics of the cavities corresponding to the two sound ducts (for example, generating more different modes in the high-frequency band) makes it difficult to maintain the same amplitude of sound output from the two sound ducts, and also difficult to stably maintain a 180° phase difference. As a result, the far-field directivity of the sound decreases, and the sound leakage reduction capability decreases. Therefore, in some embodiments, the crossover frequency is 4 kHz or less to ensure that the acoustic output device 100 has sufficient sound leakage reduction capability. In some embodiments, the crossover frequency is 3 kHz or less to ensure that the acoustic output device 100 has excellent sound leakage reduction capability.

[0082] In some embodiments of this specification, by limiting the crossover frequency to 4 kHz or less, the difference in radiated far-field sound pressure levels from the two sound guide holes satisfies the requirements, ensuring the far-field directivity of the sound and guaranteeing that the acoustic output device 100 has sufficient sound leakage reduction capability.

[0083] In some embodiments, as shown in Figure 3, the vibration direction of the bone conduction transducer 11 and the vibration direction of the air conduction transducer 12 are installed intersecting, the first housing 101 and the second housing 102 engage with each other along the vibration direction of the bone conduction transducer 11, and the third housing 103 engages with the first housing 101 and / or the second housing 102 along the vibration direction of the air conduction transducer 12. Specifically, the vibration direction of the bone conduction transducer 11 and the vibration direction of the air conduction transducer 12 are installed intersecting. The vibration direction of the bone conduction transducer 11 may be referred to below as the first vibration direction X1, and the vibration direction of the air conduction transducer 12 may be referred to as the second vibration direction X2, and the first vibration direction X1 and the second vibration direction X2 are installed intersecting, not parallel to each other, for example, they are installed perpendicularly or nearly perpendicularly (e.g., 90°±10°). When the bone conduction transducer 11 and the air conduction transducer 12 operate simultaneously, they vibrate along a first vibration direction X1 and a second vibration direction X2, respectively. Since their vibration directions intersect, the vibration of the bone conduction transducer 11 effectively mitigates the effect of its vibration on the sound quality of the air conduction transducer 12. Furthermore, the first housing 101 and the second housing 102 are assembled to engage with each other along the first vibration direction X1, and the third housing 103 and the first housing 101 are assembled to engage along the second vibration direction X2. For example, only the first housing 101 and the third housing 103 may engage to form a housing cavity 1002, and the third housing 103 may engage only with the first housing 101 along the second vibration direction X2. Similarly, in other embodiments of the housing 10, the third housing 103 should engage with the housing forming the housing cavity 1002 along the second vibration direction X2. This method facilitates the assembly of core assembly 1 and improves the assembly efficiency of core assembly 1.

[0084] Figure 4 is a schematic cross-sectional view in the AA direction of a core assembly according to some embodiments of this specification. Figure 5A is a schematic cross-sectional view in the AA direction of a core assembly according to another embodiment of this specification. Figure 5B is a schematic configuration diagram of a core assembly according to another embodiment of this specification.

[0085] In some embodiments, as shown in Figures 4, 5A, and 5B, the bone conduction transducer 11 includes a first magnetic circuit 111, a diaphragm 112, and a first coil 113. The first coil 113 is inserted into the magnetic gap of the first magnetic circuit 111 along a first vibration direction X1, and the housing 10 is connected to the magnetic permeable cover 1112 of the first magnetic circuit 111. The magnetic field formed after the first coil 113 is energized interacts with the magnetic field formed by the first magnetic circuit 111, driving the diaphragm 112 to vibrate along the first vibration direction X1. As a result, the magnetic permeable cover 1112 vibrates under the action of a reaction force, transmitting the vibration to the housing 10, which then contacts the user's skin to transmit bone conduction sound waves.

[0086] In some embodiments, the first magnetic circuit 111 may include a magnet 1111 and a magnetic permeable cover 1112. For example, in the embodiment shown in Figure 4, the magnetic permeable cover 1112 is a cylindrical structure and may be fitted outside the first coil 113, and the magnet 1111 may be installed inside the first coil 113, and the magnetic permeable cover 1112 and the magnet 1111 are spaced apart in a direction perpendicular to the first vibration direction X1, and a magnetic gap of the first magnetic circuit 111 is formed between the inner wall of the magnetic permeable cover 1112 and the outside of the magnet 1111, and the first coil 113 is located within this magnetic gap. In some embodiments, the magnetic permeable cover 1112 is fixed by being connected to the inner wall of the housing 10 (e.g., a first housing 101 and / or a second housing 102). In the embodiment shown in Figure 4, the two diaphragms 112 are each fixed to both sides of the cylindrical structure of the magnetic permeable cover 1112. In some embodiments, both ends of the magnetic permeable cover 1112 may be sealed, thereby creating a sealed space within the magnetic permeable cover 1112, preventing sound generated in the first magnetic circuit 111 from leaking to the outside. In some embodiments, the first coil 113 may be fitted outside the magnet 1111 around an axis parallel to the first vibration direction X1 of the bone conduction transducer 11. In some embodiments, the magnetic permeable cover 1112 is fitted outside the first coil 113 around an axis parallel to the first vibration direction X1 of the bone conduction transducer 11, i.e., the magnetic permeable cover 1112 and the magnet 1111 are spaced apart in a direction perpendicular to the first vibration direction X1 of the bone conduction transducer 11. Specifically, the first coil 113 may be connected to the magnetic permeable cover 1112. In some embodiments of this specification, the first coil 113 is in close contact with the inner wall of the magnetic permeable cover 1112.

[0087] In some embodiments, the magnet 1111 is fixed by the diaphragm 112. For example, the diaphragm 112 and the first magnetic circuit 111 may be arranged along a first vibration direction X1, and the side of the diaphragm 112 perpendicular to the first vibration direction X1 may be connected to the side of the magnet 1111 perpendicular to the first vibration direction X1, thereby achieving fixation of the magnet 1111.

[0088] In some embodiments, as shown in Figures 4 and 5A, the diaphragm 112 may include a first diaphragm 1121 and a second diaphragm 1122. In the first vibration direction X1 of the bone conduction transducer 11, the first diaphragm 1121 and the second diaphragm 1122 may be connected to the magnet 1111 on opposite sides of the magnet 1111. In some embodiments, the first diaphragm 1121 and the second diaphragm 1122 are installed symmetrically on both sides of the first magnetic circuit 111. For example, the first diaphragm 1121 and the second diaphragm 1122 are installed symmetrically on both sides along the first vibration direction X1 of the first magnetic circuit 111. In some embodiments, to facilitate installation, the axes of symmetry of the first diaphragm 1121 and the second diaphragm 1122 and the central axis of the air conduction transducer 12 may be spaced apart in the first vibration direction X1, thereby increasing the airflow through the second sound guide hole 1081 and / or air passage 1081a.

[0089] In some other embodiments of the present invention, the bone conduction transducer 11 may include only one diaphragm 112. In this case, the magnetic permeable cover 1112 may be a cylindrical structure with one end sealed and the other end open. The diaphragm 112 may be installed on the open side of the magnetic permeable cover 1112. The magnet 1111 may be located inside the magnetic permeable cover 1112. The first coil 113 may be inserted into a magnetic gap formed between the inner wall of the magnetic permeable cover 1112 and the outside of the magnet 1111. The housing 10 is connected to the magnetic permeable cover 1112 by the diaphragm 112, and the magnetic field formed after the first coil 113 is energized interacts with the magnetic field formed by the first magnetic circuit 111, driving the diaphragm 112 to vibrate along a first vibration direction X1, and the magnetic permeable cover 1112 transmits the vibration to the housing 10. The housing 10 transmits bone conduction sound waves in contact with the user's skin.

[0090] In some embodiments, as shown in Figures 4, 5A, and 5B, the air-conducting transducer 12 includes a second magnetic circuit 121, a diaphragm 122, a second coil 123, and a frame 124. The frame 124 provides a mounting platform, and the second magnetic circuit 121, the diaphragm 122, and the second coil 123 are connected to the housing 10 via the frame 124. The diaphragm 122 covers the second coil 123 and the second magnetic circuit 121 in a second vibration direction X2. The second coil 123 is inserted into the magnetic gap of the second magnetic circuit 121 and connected to the diaphragm 122. The magnetic field formed after the second coil 123 is energized interacts with the magnetic field formed by the second magnetic circuit 121, driving the diaphragm 122 to vibrate mechanically along the second vibration direction X2, generating sound through transmission via a medium such as air, and outputting it through a sound channel.

[0091] In some embodiments, the second magnetic circuit 121 includes a magnet 1211 and a magnetic permeable cover 1212, wherein the side of the magnet 1211 away from the vibrating diaphragm 122 is attached to the bottom wall of the magnetic permeable cover 1212, and a magnetic gap of the second magnetic circuit 121 is formed between the circumferential side of the magnet 1211 and the circumferential inner wall of the magnetic permeable cover 1212. In some embodiments, the circumferential outer wall of the magnetic permeable cover 1212 is connected to and fixed to a frame 124. In some embodiments, an edge 1221 is provided on the circumferential side of the vibrating diaphragm 122, and the vibrating diaphragm 122 is connected to and fixed to the frame 124 by the edge 1221. In some embodiments, the frame 124 is connected to and fixed to the inner wall of the housing 10 (e.g., a second housing 102 and / or a third housing 103).

[0092] In some embodiments of this specification, the diaphragm 112 vibrates along a first vibration direction X1, and the diaphragm 122 vibrates along a second vibration direction X2. The first vibration direction X1 and the second vibration direction X2 are positioned to intersect, and a certain angle is formed between them. This avoids mutual influence between the vibration of the bone conduction transducer and the vibration of the air conduction transducer, thereby ensuring the sound generation efficiency and accuracy of the sound generation frequency of the bone conduction transducer and the air conduction transducer. In some embodiments, in order to minimize the influence of the interaction between the vibration of the bone conduction transducer 11 and the vibration of the air conduction transducer 12 on the sound output performance of the sound output device 100, the angle range between the first vibration direction X1 and the second vibration direction X2 is 80° to 100°. In some embodiments, the angle range between the first vibration direction X1 and the second vibration direction X2 is 85° to 95°. In some embodiments, the angle range between the first vibration direction X1 and the second vibration direction X2 is 88° to 92°. In some embodiments, in order to minimize the mutual influence between the vibration of the bone conduction transducer 11 and the vibration of the air conduction transducer 12, the first vibration direction X1 and the second vibration direction X2 should be as perpendicular as possible. For example, in the embodiment shown in Figure 4, the angle between the first vibration direction X1 and the second vibration direction X2 is 90°.

[0093] In some embodiments, the second magnetic circuit 121 of the air conduction transducer 12 is located on the opposite side of the bone conduction transducer 11 of the diaphragm 122. Specifically, the second coil 123, the frame 124, and the second magnetic circuit 121 are all located on the opposite side of the bone conduction transducer 11 of the diaphragm 122.

[0094] In some embodiments of this specification, since the diaphragm 122 covers the second coil 123 and the second magnetic circuit 121 in the second vibration direction X2, that is, the area of ​​the diaphragm 122 in the second vibration direction X2 is larger than the area of ​​the second magnetic circuit 121 in the second vibration direction X2, in this case, by placing the second magnetic circuit 121 of the air conduction transducer 12 on the opposite side of the diaphragm 122 from the bone conduction transducer 11, the A region of the housing 10 (as shown in Figures 4, 5A, and 5B, the A region is located at the connection between the diaphragm 122 and the second magnetic circuit 121) can be easily installed in a chamfered structure, and the distribution of the structures of the bone conduction transducer 11 and the air conduction transducer 12 inside the housing 10 becomes more rational and compact. When a user wears the acoustic output device 100, the A region on the housing 10 is located on the user's tragus, and the chamfered A region can conform to the shape of the tragus, thus avoiding the acoustic output device 100 pressing on the tragus and improving the user's wearing comfort. Furthermore, by installing the second magnetic circuit 121 of the air conduction transducer 12 on the opposite side of the diaphragm 122 from the bone conduction transducer 11, the low-frequency sound of the acoustic output device 100 can be increased, further improving the acoustic output effect of the acoustic output device 100.

[0095] In some embodiments, as shown in Figures 4, 5A, and 5B, the mass centers of the bone conduction transducer 11 and the air conduction transducer 12 can be spaced apart in the first vibration direction X1 to ensure the depressurization effect of the second sound conduit 1081. It can also be understood that the bone conduction transducer 11 and the air conduction transducer 12 are offset in the first vibration direction X1, thereby increasing the airflow through the second sound conduit 1081 and / or the air passage 1081a. Furthermore, because the bone conduction transducer 11 and the air conduction transducer 12 are offset in the first vibration direction X1, the distribution of the bone conduction transducer 11 and the air conduction transducer 12 within the housing 10 becomes more rational and compact, resulting in a more aesthetically pleasing appearance for the acoustic output device 100.

[0096] In some embodiments, the center of mass of the bone conduction transducer 11 and the center of mass of the air conduction transducer 12 may lie on the same plane in the second vibration direction X2. The bone conduction transducer 11 and the air conduction transducer 12 may rotate relative to each other in order to increase the airflow through the second sound conduit 1081 and / or the air passage 1081a and to improve the depressurization effect of the second sound conduit 1081. In this case, the angle range between the short axis direction of the bone conduction transducer 11 (or diaphragm 112) and the vibration direction of the diaphragm 122 of the air conduction transducer 12 may be 0° to 30°. In some embodiments, the angle range between the short axis direction of the bone conduction transducer 11 (e.g., diaphragm 112) and the vibration direction of the diaphragm 122 of the air conduction transducer 12 may be 1° to 20°. In some embodiments, the angle between the short axis direction of the bone conduction transducer 11 (e.g., the diaphragm 112) and the vibration direction of the diaphragm 122 of the air conduction transducer 12 may be in the range of 2° to 10°.

[0097] By rotating the bone conduction transducer 11 and the air conduction transducer 12 relative to each other, the distance between the center point of the corner formed between the first side wall 1001a of the bone conduction transducer 11 facing the second sound conduit hole 1081 and the second side wall 1001b adjacent to the vibrating membrane 122 of the bone conduction transducer 11 and the apex of the edge 1221 of the vibrating membrane 122 of the air conduction transducer 12 becomes larger. This increases the cross-sectional area of ​​the air passage 1081a and further increases the amount of airflow through the air passage 1081a, resulting in a greater depressurization effect in the front cavity of the air conduction transducer 12 and a greater low-frequency effect of the air conduction transducer 12.

[0098] Figure 6 is a schematic cross-sectional view of a core assembly in the BB cross-sectional direction according to some embodiments of this specification. Figure 7 is a schematic cross-sectional view of a second sound conduit according to some embodiments of this specification.

[0099] In some embodiments, the air conduction transducer 12 is installed in a housing cavity 1002. The vibrating membrane 122 divides the housing cavity 1002 into a rear cavity 1004 and a front cavity 1003 located on opposite sides of the vibrating membrane 122. The rear cavity 1004 is located on the opposite side of the partition wall 1012 of the vibrating membrane 122, and the front cavity 1003 is located between the vibrating membrane 122 and the partition wall 1012. The first sound guide hole 1080 connects the rear cavity 1004 to the external environment, and the second sound guide hole 1081 connects the front cavity 1003 to the external environment. When the vibrating membrane 122 vibrates along the air conduction vibration direction X2, the front cavity 1003 is depressurized by the second sound guide hole 1081.

[0100] In some embodiments, the first sound guide hole 1080 is installed in a portion of the housing 10 that forms the rear cavity 1004. In some embodiments, the second magnetic circuit 121 is located within the rear cavity 1004, and the first sound guide hole 1080 is located on the side wall of the housing 10 facing the bottom wall of the magnetic permeable cover 1212 (or the second magnetic circuit 121). With this installation method, when a user wears the acoustic output device 100, the first sound guide hole 1080 faces the user's ear canal, allowing the air-conducted sound waves output by the air-conducted transducer 12 to enter the user's ear canal more effectively.

[0101] In some embodiments, in order to avoid or reduce near-field mutual influence between the sound output by the second sound port 1081 and the sound output by the first sound port 1080, the second sound port 1081 can be positioned as far away from the first sound port 1080 as possible, while ensuring that the second sound port 1081 communicates with the front cavity 1003. In some embodiments, the second sound port 1081 may be positioned on the side wall of the housing 10 (which may also be called the lower side wall, as shown in Figure 9, a lower side wall 104) away from the ear hook assembly 2 along the extending direction of the ear hook assembly 2. In some embodiments, the second sound port 1081 may be positioned in part of the housing 10 that forms the front cavity 1003 and is close to the partition wall 1012. When the user wears the sound output device 100, the second sound port 1081 moves away from the ear hook assembly 2 and closer to the user's earlobe, thus moving away from the user's ear canal, and thus avoiding or reducing the impact of the sound output by the second sound port 1081 on the user's listening.

[0102] In some embodiments, at least a portion of the partition wall 1012 can extend toward the side where the housing cavity 1001 is located and form part of the hole wall of the second sound conduit 1081, and the air passage 1081a of the second sound conduit 1081 is installed to extend toward the side where the housing cavity 1001 is located. This installation method causes the second sound conduit 1081 to be further away from the first sound conduit 1080, effectively reducing the influence of the second sound conduit 1081 on the first sound conduit 1080 and increasing the user's listening volume. Furthermore, by installing the air passage 1081a of the second sound conduit 1081 to extend toward the side where the housing cavity 1001 is located, the cross-sectional dimensions of the air passage 1081a in the direction from the inlet end to the outlet end gradually increase, ensuring the amount of airflow through the second sound conduit 1081 and further ensuring a higher pressure reduction effect.

[0103] In some embodiments of this specification, by installing the second sound port 1081 on a portion of the side wall of the housing 10 away from the ear hook assembly 2, the second sound port 1081 is positioned as far away as possible from the first sound port 1080, thereby avoiding or reducing the impact of the sound output from the second sound port 1081 on the user's listening and increasing the listening volume.

[0104] Figure 8 is a schematic diagram of the installation position of the second sound conduit according to some embodiments of this specification.

[0105] In some embodiments, as shown in Figure 8, the second sound port 1081 may be installed on the outer wall of the housing 10. This outer wall is the side wall of the housing 10 that is away from the user's face when worn. Since the first sound port 1080 is installed on the side wall of the housing 10 facing the user's ear canal, in this case the second sound port 1081 is installed on the side wall of the housing 10 that is away from the user's ear. By installing the second sound port 1081 away from the user's ear canal, the sound output from the second sound port 1081 does not affect listening in the ear canal, thus ensuring the user's listening quality.

[0106] In some embodiments, the acoustic output device 100 may include two or more second sound ducts communicating with the front cavity 1003. Multiple second sound ducts may be installed on any side walls of the housing 10. For example, the acoustic output device 100 may include two second sound ducts simultaneously, with one second sound duct installed on the outer wall and another on the lower side wall. Alternatively, for example, the acoustic output device 100 may include two second sound ducts simultaneously, both of which may be installed on the lower side walls.

[0107] In some embodiments, the second sound channel 1081 communicates with the front cavity 1003 via the air passage 1081a. In some embodiments, the diaphragm 112 has a longitudinal axis L1 perpendicular to the first vibration direction X1 (see Figure 6). In this application, the diaphragm 112 has its minor axis in the direction corresponding to its smallest dimension, and the longitudinal axis L1 of the diaphragm 112 is perpendicular to that minor axis. Because there is sufficient space in the acoustic output device 100 to install the air passage 1081a, the distance d1 between the lowest point of the bone conduction transducer 11 and the lowest point of the outer opening of the second sound channel 1081 in the longitudinal axis L1 can be 1.00 mm or more, for example, 1.2 mm, 1.35 mm, 1.5 mm, 1.65 mm, 2 mm, etc. The lowest point described herein may refer to the point furthest from the ear hook assembly 2 in the longitudinal axis L1 when worn.

[0108] In some embodiments of this specification, by limiting the distance between the lowest point of the bone conduction transducer 11 in the longitudinal axis L1 and the lowest point of the outer opening of the second sound conduit 1081, there is sufficient space in the front cavity 1003 to install the air passage 1081a, avoiding the air passage 1081a of the second sound conduit 1081 being extremely narrow, ensuring that the front cavity 1003 has sufficient depressurization output to cancel out the sound from the first sound conduit 1080 in the far field, thereby reducing far-field sound leakage.

[0109] In some embodiments, because there is sufficient space in the front cavity 1003 to install the air passage 1081a, the radius of curvature of the corner formed between the first side wall 1001a adjacent to the second sound conduit 1081 of the bone conduction transducer 11 and the second side wall 1001b adjacent to the vibrating membrane 122 of the bone conduction transducer 11 can be made larger than 1.00 mm. For example, the radius of curvature may be 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, 2.5 mm, etc. In some embodiments, because there is sufficient space in the front cavity 1003 to install the air passage 1081a, the distance d2 between the center point of the corner formed between the first side wall 1001a adjacent to the second sound conduit 1081 of the bone conduction transducer 11 and the second side wall 1001b adjacent to the vibrating membrane 122 of the bone conduction transducer 11 and the vertex of the edge 1221 of the vibrating membrane 122 can be 1.2 mm or more in the second vibration direction X2. For example, this distance d2 may be 1.5 mm, 1.8 mm, 2 mm, 2.5 mm, 3 mm, etc. The vertex of the edge 1221 refers to the point on the edge 1221 closest to the bone conduction transducer 11. In some embodiments, because there is sufficient space in the front cavity 1003 to install the air passage 1081a, the distance d3 between the center point of the corner formed between the first side wall 1001a adjacent to the second sound conduit hole 1081 of the bone conduction transducer 11 and the second side wall 1001b adjacent to the vibrating membrane 122 of the bone conduction transducer 11 and the vertex of the edge 1221 of the vibrating membrane 122 can be 1.5 mm or more. For example, this distance d3 may be 1.8 mm, 2 mm, 2.4 mm, 2.6 mm, 3 mm, etc.

[0110] In some embodiments of this specification, by limiting the radius of curvature of the corner adjacent to the second sound conduit 1081 on the bone conduction transducer 11, and / or by limiting the distance between the center point of the corner adjacent to the second sound conduit 1081 on the bone conduction transducer 11 and the apex of the edge 1221 of the diaphragm 122, there is sufficient space in the front cavity 1003 to install the air passage 1081a, thereby avoiding the air passage 1081a of the second sound conduit 1081 being extremely narrow and ensuring that it has sufficient depressurization output to cancel out the sound from the first sound conduit 1080.

[0111] In some embodiments, the cross-sectional area of ​​the air passage 1081a of the second sound conduit 1081 gradually increases in the direction from the housing cavity 1002 to the external environment. In other words, the side of the air passage 1081a facing the housing cavity 1001 extends inclined, and the cross-sectional area of ​​the air passage 1081a gradually increases in the direction from the housing cavity 1002 to the external environment, which makes gas release smoother and improves the sound quality of the sound generated by the sound output device 100. In some embodiments, in order to ensure that the second sound conduit 1081 has sufficient depressurization output to cancel out the sound from the first sound conduit 1080 in the far field, the minimum cross-sectional area of ​​the air passage 1081a of the second sound conduit 1081 is 5.3 mm². 2 That concludes the explanation. In some embodiments, in order to ensure that the second sound conduit 1081 has sufficient depressurization output and cancels out the sound from the first sound conduit 1080 in the far field, the minimum cross-sectional area of ​​the air passage 1081a of the second sound conduit 1081 is 6 mm 2 The above is true, for example, the minimum cross-sectional area is 6.2 mm². 2 , 6.5mm 2 , 6.8mm 2 You can also use these.

[0112] In some embodiments of this specification, by limiting the minimum cross-sectional area of ​​the air passage 1081a, the second sound conduit 1081 has sufficient sound output to cancel out the sound from the first sound conduit 1080, ensuring sufficient sound leakage reduction capability.

[0113] Figure 9 is a schematic surface view of some of the housings according to some embodiments of this specification. Figure 10 is a schematic surface view of some of the housings according to some embodiments of this specification.

[0114] In some embodiments, the acoustic output device 100 further includes a microphone that converts a sound signal (sound wave) into an audio signal, and a microphone hole 1082 is provided in the housing 10 of the acoustic output device 100 (for example, a first housing 101, a second housing 102, and / or a third housing 103). The microphone picks up external sound through the microphone hole 1082.

[0115] In some embodiments, the microphone hole 1082 is installed adjacent to the second sound guide hole 1081, and both the microphone hole 1082 and the second sound guide hole 1081 are covered with the same steel mesh 110. By installing them in this manner, the overall dimensional area of ​​the steel mesh 110 is effectively increased, reducing the risk of external adverse factors such as sweat and rainwater seeping into the steel mesh 110 and forming a water film that blocks the second sound guide hole 1081. Furthermore, it effectively ensures that the second sound guide hole 1081 performs its depressurization operation normally, thereby effectively improving the stability of the sound output of the acoustic output device 100. In addition, by covering the microphone hole 1082 and the second sound guide hole 1081 with the same steel mesh 110, the acoustic output device 100 can also achieve a high aesthetic effect. Furthermore, as shown in Figure 9, the steel mesh 110 is installed in an arc shape. When a user wears the sound output device 100, sweat, rainwater, etc. flowing over the steel mesh 110 ultimately fall directly onto the bottom of the steel mesh 110 (the location of the second sound guide hole 1081) or slide down before falling. This effectively prevents external harmful factors such as sweat and rainwater from accumulating on the steel mesh 110 and forming a blockage. Additionally, by installing the steel mesh 110 in an arc shape, the kinetic energy of external harmful factors such as sweat and rainwater is effectively increased, effectively preventing the accumulation of these factors on the steel mesh 110 and blocking the second sound guide hole 1081. Moreover, this effectively improves the operational stability of the sound output device 100.

[0116] In some embodiments, the housing 10 is provided with a first recess 1004 which communicates with a second sound guide hole 1081 and an air passage 1081a, and the steel mesh 110 further covers the opening of the first recess 1004. Based on this, if the liquid blocks a portion of the steel mesh 110, the first recess 1004 communicates with the air passage 1081a, allowing the sound from the front cavity 1003 to pass through the air passage 1081a and be output to the outside from the first recess 1004. In other words, the first recess 1004 can act as an auxiliary pressure relief hole for the air conduction transducer 12, effectively increasing the pressure relief area of ​​the second sound guide hole 1081. When the second sound guide hole 1081 is blocked, the air conduction transducer 12 continues to be pressure-reduced by the first recess 1004, thereby ensuring the sound leakage reduction capability of the sound output device 100, effectively reducing the probability and degree of low-frequency sound loss of the sound output device 100, and further effectively improving the operational stability of the sound output device 100.

[0117] In some embodiments, by completely covering the first recess 1004, the microphone hole 1082, and the second sound guide hole 1081 with the steel mesh 110, external factors such as sweat and rainwater can effectively prevent the second sound guide hole 1081 and the first recess 1004 from becoming blocked, and other external particulate and undesirable factors can effectively prevent them from entering the front cavity 1003 along the second sound guide hole 1081 and the first recess 1004 and causing damage to the air conduction transducer 12, thereby effectively improving the stability of sound generation of the acoustic output device 100. Furthermore, the steel mesh 110 is installed in an arc shape according to the above method, so that external undesirable factors such as sweat and rainwater flowing through the steel mesh 110 ultimately fall directly to the bottom of the steel mesh 110 or slide down before falling, thereby effectively preventing the accumulation and crystallization of external undesirable factors such as sweat and rainwater on the steel mesh 110. Moreover, by installing the steel mesh 110 in an arc shape, the kinetic energy of external undesirable factors such as sweat and rainwater is effectively increased, effectively preventing the accumulation of external undesirable factors such as sweat and rainwater on the steel mesh 110 and blocking the second sound guide hole 1081, and furthermore, the stability of the operation of the sound output device 100 can be effectively improved.

[0118] In some embodiments, at least a portion of the microphone hole 1082 can be located closer to the ear hook assembly 2 than the second sound guide hole 1081. If a liquid such as sweat or rainwater flows along the surface of the housing 10 to the bottom of the steel mesh 110 (or the bottom of the housing 10), at least a portion of the microphone hole 1082 can be located closer to the ear hook assembly 2 than the second sound guide hole 1081. That is, when the acoustic output device 100 is worn, the microphone hole 1082 is not located directly below it when worn, and therefore the steel mesh 110 extending to the position of the microphone hole 1082 is not easily blocked, and gas in the air passage 1081a is transmitted through the second sound guide hole 1081 to the steel mesh extending to the position of the microphone hole 1082 and output to the outside, ensuring the normal operation of the air conduction transducer 12.

[0119] In some embodiments of this specification, by increasing the area of ​​the steel mesh 110 or by forming a cavity between the outer surface of the steel mesh 110 and the outer surface of the housing 10, it is possible to prevent the steel mesh 110 from being completely blocked by the liquid, thereby ensuring that sound can be smoothly output from the second sound guide hole 1081 and ensuring the sound leakage reduction capability of the sound output device 100.

[0120] Figure 11 shows the effect of crossover frequency on the power consumption of an audio output device in some embodiments of this specification. In Figure 11, the horizontal axis represents the output volume of the audio output device 100 (the numerical value corresponds to the volume level), and the vertical axis represents the current consumption of the audio output device 100. The larger the current, the greater the power consumption. Curve 1 represents the power consumption at standard volume when the duration of the target product is 10h, and curve 2 represents the power consumption at standard volume when the duration of the target product is 12h. Curves 3, 4, 5, and 6 represent the current consumption of the audio output device 100 when the crossover frequencies are 2kHz, 1.5kHz, 1kHz, and 500Hz, respectively. As can be seen from Figure 11, power consumption tends to increase as the output volume (volume level) increases. Also, as the crossover frequency increases, power consumption at the same output volume decreases significantly. When the crossover frequency is 2kHz, i.e., curve 3 is lower than curve 2 and closer to curve 1 at a volume level of 11-12. Furthermore, as the crossover frequency increases, the tendency for current consumption to increase with volume also becomes more gradual. This means that increasing the crossover frequency also has an advantage in reducing power consumption at high volume levels.

[0121] Therefore, in some embodiments, the crossover frequency may be set to 1kHz, 2kHz or higher, and by using a dipole (two sound guide holes) output structure, sound leakage from the sound output device 100 is reduced, low power consumption is guaranteed, and the sound output device 100 has high sound leakage reduction capability in the mid-to-low frequency range (e.g., 20Hz to 2.5kHz) and an overall low sound leakage phenomenon.

[0122] Having explained the basic concepts above, it will be clear to those skilled in the art that the above detailed disclosures are merely examples and do not limit this specification. Although not explicitly stated herein, those skilled in the art can make various changes, improvements, and modifications to this specification. These changes, improvements, and modifications are intended to be suggested herein and are therefore within the spirit and scope of the exemplary embodiments herein.

Claims

1. Housing and A bone conduction vibrator that generates bone conduction sound waves and transmits them to the cochlea via the housing to produce sound, An air conduction vibrator that generates air conduction sound waves and transmits them to the ear through a sound guide hole on the housing, A processing module that supplies a first audio signal and a second audio signal to the bone conduction transducer and the air conduction transducer, respectively, wherein the first audio signal and the second audio signal have a crossover frequency, and each includes components with frequencies above the crossover frequency and components with frequencies below the crossover frequency, and the crossover frequency is 600 Hz or higher. An ear hook assembly connected to the housing, Includes, The sound duct on the housing includes a first sound duct and a second sound duct located at a different position from the first sound duct, the second sound duct being installed on the side wall of the housing away from the ear hook assembly along the extending direction of the ear hook assembly, in an acoustic output device.

2. The acoustic output device according to claim 1, wherein the crossover frequency is 1500 Hz or higher.

3. The sound output device according to claim 1, wherein the sound radiated into a distant field through the first sound conduit and the second sound conduit has directionality, and the directionality is expressed as the difference between the sound pressure level in the direction of the line connecting the first sound conduit and the second sound conduit and the sound pressure level in at least one other direction being 3 dB or more.

4. The sound output device according to claim 3, wherein the sound emitted from the first sound duct and the second sound duct has an amplitude difference of less than 6 dB and a phase difference of 150° to 210°.

5. The acoustic output device according to claim 4, wherein the difference in acoustic load between the first sound conduit and the second sound conduit is less than 0.

15.

6. The acoustic output device according to claim 4, wherein the crossover frequency is 4000 Hz or less.

7. The bone conduction transducer includes a first magnetic circuit, a diaphragm, and a first coil. The air conduction vibrator includes a diaphragm, a second magnetic circuit, and a second coil. The acoustic output device according to claim 1, wherein the angle range between the first vibration direction in the first magnetic circuit of the diaphragm and the second vibration direction in the second magnetic circuit of the vibrating membrane is 80° to 100°.

8. The center of mass of the bone conduction transducer and the center of mass of the air conduction transducer are spaced apart in the first vibration direction, or The bone conduction transducer includes two diaphragms located on both sides of the first magnetic circuit and positioned symmetrically, and the axes of symmetry of the two diaphragms and the central axis of the air conduction transducer are spaced apart in the first vibration direction. The sound output device according to claim 7.

9. The acoustic output device according to claim 7, wherein the second magnetic circuit of the air conduction vibrator is located on the opposite side of the vibrating membrane from the bone conduction vibrator.

10. The acoustic output device according to claim 9, wherein the first sound guide hole is located on the side wall of the housing facing the bottom wall of the second magnetic circuit opposite to the diaphragm, and the second sound guide hole communicates with the front cavity on which the diaphragm opposite to the second magnetic circuit is located.

11. The diaphragm has a long axis perpendicular to the first vibration direction, and in the long axis direction, the distance between the lowest point of the bone conduction transducer and the lowest point of the outer opening of the second sound conduit is 1.0 mm or more, or, The radius of curvature of the corner formed between the first side wall of the bone conduction transducer adjacent to the second sound conduit and the second side wall of the bone conduction transducer adjacent to the vibrating membrane is greater than 1.0 mm. The sound output device according to claim 10.

12. The front cavity includes an air passage communicating with the second sound guide hole, and the minimum cross-sectional area of ​​the air passage is 5.3 mm². ２ The above is the sound output device according to claim 10.

13. The acoustic output device according to claim 1, further comprising a microphone, wherein the housing is provided with a microphone hole corresponding to the microphone, and the microphone hole and the second sound guide hole are covered with the same steel mesh.

14. The acoustic output device according to claim 13, wherein, when worn, the microphone hole is closer to the ear hook assembly than the second sound guide hole.

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