A sound leakage reducing device and an acoustic output device

Abstract

The embodiment of the application discloses a sound leakage reducing device, comprising a transducing structure, a vibrating structure and a shell; the shell has a vibrating cavity and at least one resonant cavity; the transducing structure is located in the vibrating cavity and connected with the vibrating structure; the at least one resonant cavity is communicated with the vibrating cavity through at least one communication hole, and the volume of each resonant cavity is smaller than that of the vibrating cavity.

Description

Technical Field

[0001] This application relates to the field of sound transmission technology, and in particular to a sound leakage reduction device and a sound output device. Background Technology

[0002] Loudspeakers that use bone conduction as one of the primary means of sound transmission rely on their sound-conducting (sound-conducting) vibrating components to mechanically vibrate based on electrical signals (e.g., control signals from signal processing circuits). This mechanical vibration generates conducted sound waves that are ultimately transmitted to the human body. In contrast, the sound-conducting vibrating components of traditional loudspeakers transmit mechanical vibrations to the speaker's housing structure, causing it to vibrate. This vibration, in turn, causes the surrounding air to vibrate, resulting in sound leakage and affecting the loudspeaker's sound transmission performance. Summary of the Invention

[0003] One embodiment of this application provides a noise reduction device, including a transducer structure, a vibration structure, and a housing; the housing has a vibration cavity and at least one resonant cavity; the transducer structure is located inside the vibration cavity and connected to the vibration structure; the at least one resonant cavity is connected to the vibration cavity through at least one through hole, and the volume of each resonant cavity is smaller than the volume of the vibration cavity.

[0004] One embodiment of this application provides an acoustic output device, including the sound leakage reduction device described in any of the embodiments of this application. Attached Figure Description

[0005] This application will be further described by way of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting; in these embodiments, the same reference numerals denote the same structures, wherein:

[0006] Figure 1 This is a schematic diagram of the structure of a sound leakage reduction device according to some embodiments of this application;

[0007] Figure 2 This is a schematic diagram of the structure of a sound leakage reduction device according to some embodiments of this application;

[0008] Figure 3 This is a schematic diagram of the structure of a sound leakage reduction device according to some embodiments of this application;

[0009] Figure 4 This is a schematic diagram of the structure of a sound leakage reduction device according to some embodiments of this application;

[0010] Figure 5 This is a sound leakage curve diagram of a sound leakage reduction device according to some embodiments of this application;

[0011] Figure 6This is a sound leakage curve diagram of a sound leakage reduction device according to some embodiments of this application;

[0012] Figure 7 This is a schematic diagram of the structure of a sound leakage reduction device according to some embodiments of this application;

[0013] Figure 8 This is a schematic diagram of the structure of a sound leakage reduction device according to some embodiments of this application;

[0014] Figure 9 This is a schematic diagram of the structure of a sound leakage reduction device according to some embodiments of this application;

[0015] Figure 10 This is a sound leakage curve diagram of a sound leakage reduction device according to some embodiments of this application;

[0016] Figure 11 This is a schematic diagram of the structure of a sound leakage reduction device according to some embodiments of this application;

[0017] Figure 12 This is a sound leakage curve diagram of a sound leakage reduction device according to some embodiments of this application;

[0018] Figure 13 This is a sound leakage curve diagram of a sound leakage reduction device according to some embodiments of this application;

[0019] Figure 14 This is a schematic diagram of the structure of a sound leakage reduction device according to some embodiments of this application;

[0020] Figure 15 This is a schematic diagram of the structure of a sound leakage reduction device according to some embodiments of this application;

[0021] Figure 16 This is a sound leakage curve diagram of a sound leakage reduction device according to some embodiments of this application;

[0022] Figure 17 This is a sound leakage curve diagram of a sound leakage reduction device according to some embodiments of this application;

[0023] Figure 18 This is a schematic diagram of the acoustic output device according to some embodiments of this application.

[0024] Explanation of reference numerals in the attached figures

[0025] 110-Transducer structure, 120-Vibration structure, 121-Vibration panel, 122-Vibration conductor, 130-Shell, 131, 132, 133-Outer wall, 140-Vibration cavity, 150-Resonant cavity, 160-Connecting hole, 170, 123-Side wall, 180, 181, 182-Sound vent, 210-First resonant cavity, 220-Second resonant cavity, 230-First side wall, 231-First connecting hole, 240-Second side wall, 241-Second connecting hole, 232 - Third connecting hole, 310- Third resonant cavity, 320- Fourth resonant cavity, 330- Third sidewall, 331- Fourth connecting hole, 340- Fifth resonant cavity, 350- Fourth sidewall, 351- Fifth connecting hole, 190- Baffle, 191, 192, 196- Resonant cavity body, 1800- Acoustic output device, 111- Magnetic circuit device, 112- Coil, 113- Vibration transducer, 410- Housing support, 411- Support hole, 420- Ear hook element, 430- Elastic connector. Detailed Implementation

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. For those skilled in the art, these drawings can be applied to other similar scenarios without creative effort. Unless obvious from the context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0027] It should be understood that the terms “system,” “device,” “unit,” and / or “module” used herein are one way to distinguish different components, elements, parts, sections, or assemblies at different levels. However, if other terms can achieve the same purpose, they may be replaced by other expressions.

[0028] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0029] Flowcharts are used in this application to illustrate the operations performed by the system according to embodiments of this application. It should be understood that the preceding or following operations are not necessarily performed precisely in sequence. Instead, the steps can be processed in reverse order or simultaneously. Furthermore, other operations can be added to these processes, or one or more steps can be removed from them.

[0030] Figure 1 This is a schematic diagram of the structure of a sound leakage reduction device according to some embodiments of this application.

[0031] The sound leakage reduction device 100 may include a transducer structure 110, a vibrating structure 120, and a housing 130. The housing 130 has a vibrating cavity 140 and at least one resonant cavity 150. The transducer structure 110 is located within the vibrating cavity 140 and connected to the vibrating structure 120. The resonant cavity 150 is connected to the vibrating cavity 140 through at least one through hole 160, wherein the volume of the resonant cavity 150 is smaller than the volume of the vibrating cavity 140. The transducer structure 110 can drive the vibrating structure 120 to vibrate and generate sound transmitted to the human ear. The resonant cavity 150 is used to absorb the sound of a specific frequency generated by the transducer structure 110 within the vibrating cavity 140, thereby suppressing sound leakage generated by the sound leakage reduction device 100 at a specific frequency.

[0032] The sound leakage reduction device 100 can be a device for reducing sound leakage from a speaker. In some embodiments, the sound leakage reduction device 100 can be a speaker that uses bone conduction as one of the main modes of sound propagation. For example, the vibrating structure 120 can make large-area contact with the user's facial skin and transmit its mechanical vibrations to the skin so that the user can hear the sound. In some embodiments, the speaker can be a bone conduction speaker, an air conduction speaker, or a combined bone and air conduction speaker. In other embodiments, the speaker can be any other feasible speaker, and this application embodiment does not particularly limit this. Taking a bone conduction speaker as an example, the resonant cavity 150 in the sound leakage reduction device 100 can absorb the sound of a specific frequency generated by the transducer structure 110 in the vibrating cavity (i.e., the vibrating cavity in the form of bone conduction), thereby suppressing sound leakage generated at a specific frequency.

[0033] The transducer structure 110 is a component that converts electrical signals into mechanical vibrations. In some embodiments, the transducer structure 110 may employ a magnetic component and a voice coil structure, whereby an audio electrical signal is input to the voice coil via electromagnetic action, and the voice coil is placed in a magnetic field to drive its vibration. In some embodiments, the transducer structure 110 may employ a piezoelectric ceramic structure, converting the electrical signal into vibrations caused by shape changes in the ceramic component. In other embodiments, the transducer structure 110 may adopt any other feasible structural form, and this application does not impose any particular limitation on this.

[0034] In some embodiments, the transducer structure 110 can use specific magnetic circuit components and vibration components to convert signals containing sound information into mechanical vibrations. In some embodiments, the aforementioned conversion process may involve the coexistence and conversion of multiple different types of energy. For example, an electrical signal can be directly converted into mechanical vibrations through the transducer structure 110 to generate sound. As another example, sound information can be contained in an optical signal, and the specific transducer structure 110 can realize the process of converting the optical signal into a vibration signal. Furthermore, the types of energy coexisting and being converted during the operation of the transducer structure 110 may also include other types, such as thermal energy and magnetic field energy. In some embodiments, the energy conversion method of the transducer structure 110 may include moving coil, electrostatic, piezoelectric, moving iron, pneumatic, and electromagnetic types. In some embodiments, the vibrating body of the vibration component in the transducer structure 110 can be a mirror-symmetric structure, a centrally symmetric structure, or an asymmetrical structure. In some embodiments, the aforementioned vibrating body can be a ring structure, with multiple support rods radially converging towards the center within the ring; the number of support rods can be two or more. In some embodiments, the aforementioned vibrator may be provided with an intermittent perforated structure, which allows the vibrator to produce a larger displacement, thereby increasing the output power of vibration and sound and achieving higher sensitivity.

[0035] The housing 130 is an outer shell structure for accommodating the energy displacement structure 110 and forming the vibration cavity 140. In some embodiments, the housing 130 may be a single-cavity structure accommodating the energy displacement structure 110. In some embodiments, the housing 130 may be a multi-cavity structure accommodating the energy displacement structure 110 (i.e., forming more than one vibration cavity). In some embodiments, the structural shape of the housing 130 may be cylindrical, square, or any other feasible structural shape. In other embodiments, the housing 130 may adopt other feasible structural forms or shapes, and the embodiments of this application do not impose particular limitations on them.

[0036] The vibration cavity 140 is a vibration cavity formed by the housing 130 and the transducer structure 110 inside the housing 130. In some embodiments, the mechanical vibration generated by the transducer structure 110 is transmitted to the vibration structure 120, and the vibration structure 120 vibrates synchronously under the drive of the transducer structure 110. At the same time, the vibration of the transducer structure 110 relative to the housing 130 will also generate sound waves in the vibration cavity 140.

[0037] In some embodiments, the transducer structure 110 can generate a magnetic field within the vibration cavity, which can be used to convert signals containing sound information into vibration signals. In some embodiments, the aforementioned sound information may include video or audio files with a specific data format, or data or files that can be converted into sound through a specific method. In some embodiments, the aforementioned signals containing sound information may originate from the storage component of the sound leakage reduction device 100 itself, or from an information generation, storage, or transmission system outside the sound leakage reduction device 100. In some embodiments, the aforementioned signals containing sound information may include one or more combinations of electrical signals, optical signals, magnetic signals, and mechanical signals. In some embodiments, the aforementioned signals containing sound information may originate from one or more signal sources. In some embodiments, the aforementioned multiple signal sources may be correlated or uncorrelated.

[0038] In some embodiments, the noise reduction device 100 can acquire the aforementioned signal containing sound information in various ways, including wired or wireless acquisition, and real-time or delayed acquisition. For example, the noise reduction device 100 can receive electrical signals containing sound information via wired or wireless means, or it can directly acquire data from a storage medium (e.g., a storage component) to generate a sound signal. As another example, the noise reduction device 100 may include a component with sound acquisition capabilities, which picks up ambient sound, converts the mechanical vibrations of the sound into electrical signals, and processes them through an amplifier to obtain an electrical signal that meets specific requirements. In some embodiments, the aforementioned storage medium can store the signal containing sound information. In some embodiments, the aforementioned storage medium can adopt any feasible storage form, for example, it may include one or more storage devices, etc.

[0039] Vibration structure 120 can be a component that transmits mechanical vibrations to the human ear, specifically through human skin (e.g., facial skin). In some embodiments, vibration structure 120 may include a vibration panel 121 and a vibration conductor 122. One end of the vibration conductor 122, away from the transducer structure 110, may be located outside the housing 130 and connected to the vibration panel 121, which is also located outside the housing 130. The other end of the vibration conductor 122 (the end away from the vibration panel 121) may extend through the housing 130 into the vibration cavity 140, such that a portion of the vibration conductor 122 is located within the generation cavity 140 and connected to the transducer structure 110. The mechanical vibrations generated by the transducer structure 110 can be transmitted through the vibration conductor 122 to the vibration panel 121, which contacts human skin (e.g., facial skin), thereby transmitting the mechanical vibrations (i.e., bone conduction sound waves) to the user's ear.

[0040] In some embodiments, the vibration panel 121 may be cylindrical, square, or any other feasible structural shape. In other embodiments, the vibration panel 121 may adopt other feasible structural forms or shapes, and the embodiments of this application do not impose any particular limitations on them.

[0041] In some embodiments, the connection between the vibration structure 120 and the transducer structure 110 is not limited to the direct connection described above, but can also be an indirect connection. For example, the sound leakage reduction device 100 may also include a connector (not shown), which may be located in the vibration cavity 140. One end of the connector may be connected to the inner wall of the housing 130, and the other end of the connector may be connected to the vibration structure 120 (e.g., the vibration conductor 122). The mechanical vibration generated by the transducer structure 110 can be transmitted to the housing 130, and the vibration of the housing 130 can be transmitted to the vibration conductor 122 of the vibration structure 120 through the connector. The bone conduction sound waves are then transmitted to the user through the vibration panel 121. In some embodiments, the component on the housing 130 used to close the upper surface of the housing can be used as a connector to connect the vibration panel 121 and the vibration conductor 122, eliminating the need for an additional component as a connector, improving vibration transmission efficiency, and also having the advantage of structural compactness.

[0042] In some embodiments, the housing 130 may be integrally molded. In some embodiments, the housing 130 may also be assembled by means of plug-in, snap-fit, or other methods. In some embodiments, the housing 130 may be made of metal materials (e.g., copper, aluminum, titanium, gold, etc.), alloy materials (e.g., aluminum alloy, titanium alloy, etc.), plastic materials (e.g., polyethylene, polypropylene, epoxy resin, nylon, etc.), fiber materials (e.g., cellulose acetate, cellulose propionate, carbon fiber, etc.). In some embodiments, a protective sleeve may be provided on the outside of the housing 130. The protective sleeve may be made of a soft material with a certain degree of elasticity, such as soft silicone, rubber, etc., to provide a better tactile experience for the user.

[0043] The resonant cavity 150 is used to absorb sound of a specific frequency generated by the transducer structure 110 in the resonant cavity 140, thereby suppressing the sound leakage generated by the sound leakage reduction device 110 at a specific frequency.

[0044] For example, for ease of understanding, the resonant cavity 150 can be equivalent to a Helmholtz resonant cavity. Resonance occurs when the frequency of the leaking sound wave in the vibrating cavity 140 matches the natural frequency of the resonant cavity 150. The leaking sound wave rubs against the inner wall of the resonant cavity 150, thereby consuming sound energy and achieving the purpose of sound absorption. The center frequency of the Helmholtz resonant cavity can be calculated using formula (1):

[0045]

[0046] Where f0 represents the center frequency of the Helmholtz resonant cavity, r represents the radius of the Helmholtz resonant cavity duct, l0 represents the length of the Helmholtz resonant cavity duct, S represents the cross-sectional area of ​​the Helmholtz resonant cavity duct, V0 represents the volume of the Helmholtz resonant cavity, and c represents the speed of sound propagation in air.

[0047] In some embodiments, a sound-leaking hole may be provided on the outer shell of the housing 130 to guide the sound waves from the vibration cavity 140 out of the housing 130 and cancel out the leakage sound waves generated by the vibration of the housing 130, thereby reducing sound leakage. Although this method of reducing sound leakage reduces sound leakage to a certain extent, its effect on reducing sound leakage at specific frequencies is not ideal over a wide frequency range. By further adding a resonant cavity 150 outside the vibration cavity 140 and adjusting the structure and arrangement of the vibration cavity 140 and the resonant cavity 150, sound waves in a specific frequency range within the vibration cavity 140 can be absorbed in a targeted manner, thereby adjusting the sound waves guided out from the sound-leaking hole and improving the sound leakage reduction effect of the sound-leaking hole. In some embodiments, a sound-leaking hole may not be provided on the outer shell of the housing 130. In this case, the vibration generated by the resonant cavity 150 when absorbing part of the sound waves in the vibration cavity 140 can adjust the vibration of the housing 130, which can also achieve the effect of reducing sound leakage of the housing 130.

[0048] In some embodiments, the resonant cavity 150 may be a resonant cavity body added on the basis of the vibration cavity 140. For example, the resonant cavity 150 and the vibration cavity 140 may share a sidewall, and acoustic communication is achieved through one or more connecting holes 160 on the sidewall. In some embodiments, the resonant cavity 150 may be a resonant cavity body independent of the vibration cavity 140. For example, the resonant cavity 150 and the vibration cavity 140 each have independent sidewalls, and acoustic communication is achieved between them through one or more sound guide tubes. In some embodiments, the resonant cavity 150 may include one or more resonant cavities. In some embodiments, at least one hole is provided between the vibration cavity 140 and the resonant cavity 150, or between the multiple resonant cavities of the resonant cavity 150 and each other, to achieve air conduction communication. For example, as shown in the figure... Figure 1 As shown, at least one connecting hole 160 (which can be considered as a pipe part of a Helmholtz resonant cavity) can be provided on the side wall 170 used to separate the resonant cavity 150 and the vibration cavity 140. The at least one connecting hole 160 is used to realize the air conduction communication between the vibration cavity 140 and the resonant cavity 150. In some other embodiments, the resonant cavity 150 can also be any other feasible resonant cavity, and the embodiments of this application do not particularly limit it.

[0049] In some embodiments, the cavity wall (e.g., sidewall 170) of the resonant cavity 150 may be made of the same material as the housing 130. In some embodiments, the resonant cavity 150 may be made of metallic materials (e.g., copper, aluminum, titanium, gold, etc.), alloy materials (e.g., aluminum alloy, titanium alloy, etc.), plastic materials (e.g., polyethylene, polypropylene, epoxy resin, nylon, etc.), fibrous materials (e.g., cellulose acetate, cellulose propionate, carbon fiber, etc.).

[0050] This application embodiment adds a resonant cavity in addition to the traditional vibration cavity. Through the specifically designed resonant cavity, the sound waves of a specific frequency within the vibration cavity are absorbed or canceled, thereby reducing sound leakage from the shell. Furthermore, this structural design has advantages such as simple structure and ease of fabrication.

[0051] In some embodiments, the resonant cavity 150 can reduce sound leakage at specific frequencies, i.e., absorb sound waves within a specific frequency range. The specific frequency range can be in the frequency range of 20Hz to 10000Hz (10kHz). In some embodiments, the specific frequency range can be located in a frequency range that is relatively sensitive to the human ear, such as the 1kHz to 3kHz frequency range, in order to improve the sound leakage reduction effect in this frequency range.

[0052] In some embodiments, to enable the sound leakage reduction device 100 to meet various sound leakage reduction requirements in various sound conduction scenarios (e.g., reducing sound leakage in a specific frequency range), various structural modifications can be made to the sound leakage reduction device 100. In some embodiments, at least one resonant cavity 150 may include multiple resonant cavities 150, and the multiple resonant cavities 150 are disposed on the same sidewall of the vibration cavity 140 (e.g., Figure 8 (as shown) or different sidewalls (such as) Figure 9 As shown, each resonant cavity 150 and the vibrating cavity 140 can be connected via at least one connecting hole 160 or a sound guide tube. For example, as Figure 1 , Figure 7 , Figure 11 As shown, the number of resonant cavities 150 can be varied; there can be one or more resonant cavities 150. The specific locations of the resonant cavities 150 can also be varied; they can be located on any side wall of the housing 130, and different resonant cavities 150 can be located on the same side wall or on different side walls. Similarly, the number of connecting holes 160 can be one or more. In some embodiments, the number, size, specific location, positional relationship, and structural shape of the resonant cavities 150 can be varied according to different leakage reduction requirements; this application embodiment does not impose any particular limitation.

[0053] In some embodiments, in order for the resonant cavity 150 to absorb sound waves within the target frequency range, according to formula (1) and in combination with the actual size of the vibrating cavity 140, the volume ratio between one (or each) resonant cavity 150 and the vibrating cavity 140 is not less than 0.1, so that the resonant cavity and the vibrating cavity can achieve a specific frequency leakage reduction effect within the widest possible range of volume values. In some embodiments, in some implementations, the volume ratio between each resonant cavity 150 and the vibrating cavity 140 is 0.1 to 1, so that the resonant cavity and the vibrating cavity can achieve a specific frequency leakage reduction effect within a relatively wide range of volume values. The volume ratio between a resonant cavity 150 and the vibrating cavity 140 can be set to 1 / 10 to 1 / 1. Alternatively, the volume ratio between the volume of a single resonant cavity or the total volume of multiple resonant cavities (such as the first resonant cavity 210 or the second resonant cavity 220, or, for example, the third resonant cavity 310, the fourth resonant cavity 320, and the fifth resonant cavity 340) and the volume of the vibrating cavity 140 can be set to 1 / 10 to 1 / 1, so that the resonant cavity can cover the possible leakage frequency range when absorbing sound waves, thereby improving the leakage reduction efficiency. In some embodiments, depending on the selection of the target frequency range, the volume ratio between a resonant cavity 150 and the vibrating cavity 140 can be set to 1 / 8 to 2 / 3, or the volume ratio between the volume of a single resonant cavity or the total volume of multiple resonant cavities (such as the first resonant cavity 210 or the second resonant cavity 220, or, for example, the third resonant cavity 310, the fourth resonant cavity 320, and the fifth resonant cavity 340) and the volume of the vibrating cavity 140 can be set to 1 / 8 to 2 / 3. In some embodiments, in order to ensure that the volume of the resonant cavity is within a suitable size range, the volume ratio between a resonant cavity 150 and the resonant cavity 140 can be set to 1 / 5 to 1 / 2. Alternatively, the volume ratio between the volume of a single resonant cavity or the total volume of multiple resonant cavities (such as the first resonant cavity 210 or the second resonant cavity 220, or, for example, the third resonant cavity 310, the fourth resonant cavity 320, and the fifth resonant cavity 340) and the resonant cavity 140 can be set to 1 / 5 to 1 / 2. In some embodiments, the leakage frequency range of a single resonant cavity or multiple resonant cavities (such as resonant cavity 150, the first resonant cavity 210 or the second resonant cavity 220, or, for example, the third resonant cavity 310, the fourth resonant cavity 320, and the fifth resonant cavity 340) can be calculated according to formula (1).

[0054] In some embodiments, the outer wall of the vibration cavity and / or resonant cavity may be provided with a sound leakage hole 180, so that, based on the sound leakage reduction of the resonant cavity 150, a portion of the sound waves inside the vibration cavity are led out to the outside of the housing 130 and interfere with the sound waves of leakage generated by the vibration of the housing 130 and the air outside the housing, thereby reducing the amplitude of the leakage sound and further reducing the sound leakage. The convenient improvement of further opening holes in the housing allows for further optimization of the sound leakage reduction effect without increasing the structural volume and weight.

[0055] In some embodiments, the number of holes, hole sizes, size ratios between holes, hole locations, and / or hole structures (e.g., circular or square holes, interconnected or non-interconnected holes, etc.) of the connecting hole 160 and the venting hole 180 can be configured differently according to different noise reduction requirements. For example, the ratio of the diameter D1 of the connecting hole 160 to the diameter D2 of the venting hole 180 can be set to 1 / 2 to 2, and the ratio of the pipe length L1 of the connecting hole 160 to the pipe length L2 of the venting hole 180 can be set to 1 / 2 to 2. In some embodiments, the connecting hole 160 or the venting hole 180 can be an air-conducting (i.e., air-conducting) connecting hole. In some embodiments, the connecting hole 160 can be a connecting hole for connecting the vibration cavity 140 and the resonant cavity 150. In some embodiments, the venting hole 180 can be a sound-guiding hole provided on any outer wall of the housing 130 (including any outer wall of the vibration cavity 140 or the resonant cavity 150). In some embodiments, the connecting hole 160 and / or the venting hole 180 may be unobstructed through holes to ensure the effectiveness of absorbing leaked sound waves. In some embodiments, a damping layer is provided at the upper opening of the connecting hole 160 and / or the venting hole 180 to adjust the phase and amplitude of the sound waves and correct the effect of venting the sound waves.

[0056] In some embodiments, in order to achieve a sound leakage absorption effect at a specific frequency (e.g., 1.5 kHz), enabling the resonant cavity to absorb sound waves within the target frequency range, according to formula (1) and in conjunction with the actual dimensions of the vibrating cavity 140 and the resonant cavity, the area of ​​one connecting hole 160 or the total area of ​​multiple connecting holes (such as multiple connecting holes 160, multiple first connecting holes 231, multiple second connecting holes 241, or the first connecting hole 231 and the second connecting hole 241) can be set to not less than 0.05 mm. 2 This allows the resonant cavity to cover a wide possible range of leakage frequencies during sound wave absorption, within a broad range of possible aperture area values, thereby improving leakage reduction efficiency. In some embodiments, the volume of one resonant cavity 150 or the total volume of multiple resonant cavities (e.g., the third resonant cavity 310, the fourth resonant cavity 320, and the fifth resonant cavity 340) can be set to no more than 6500 mm². 3 This ensures that, within the widest possible range of resonant cavity volume values, the resonant cavity covers the potential leakage frequency range during sound wave absorption, thereby improving leakage reduction efficiency. In some embodiments, the volume of one resonant cavity 150 or the total volume of multiple resonant cavities (e.g., the third resonant cavity 310, the fourth resonant cavity 320, and the fifth resonant cavity 340) can be set to no more than 2100 mm². 3 This allows the resonant cavity to cover a wider range of leakage frequencies during sound wave absorption within a wider range of resonant cavity volume values, thereby improving leakage reduction efficiency.

[0057] In some embodiments, the diameter of a connecting hole 160 or the total diameter of multiple connecting holes (such as multiple connecting holes 160, multiple first connecting holes 231, multiple second connecting holes 241, or the first connecting hole 231 and the second connecting hole 241) can be set to 0.1mm-10mm, and the volume of a resonant cavity 150 or the total volume of multiple resonant cavities (e.g., the third resonant cavity 310, the fourth resonant cavity 320, and the fifth resonant cavity 340) can be set to 65mm. 3 -6500mm 3 This is to ensure that the resonant cavity covers a wider range of leakage frequencies during sound wave absorption, thereby improving leakage reduction efficiency. In some embodiments, depending on the selection of the target frequency range, the diameter of at least one connecting hole 160 or the total diameter of multiple connecting holes (such as multiple connecting holes 160, multiple first connecting holes 231, multiple second connecting holes 241, or first connecting holes 231 and second connecting holes 241) can be set to 0.2mm-5mm, and the volume of one resonant cavity 150 or the total volume of multiple resonant cavities (e.g., third resonant cavity 310, fourth resonant cavity 320 and fifth resonant cavity 340) can be set to 80mm. 3 -3000mm 3 In some embodiments, to ensure that the dimensions of the connecting hole and the resonant cavity are within a suitable size range, the diameter of at least one connecting hole 160 or the total diameter of multiple connecting holes (such as multiple connecting holes 160, multiple first connecting holes 231, multiple second connecting holes 241, or first connecting holes 231 and second connecting holes 241) can be set to 0.5mm-3mm, and the volume of one resonant cavity 150 or the total volume of multiple resonant cavities (e.g., third resonant cavity 310, fourth resonant cavity 320 and fifth resonant cavity 340) can be set to 100mm. 3 -1000mm 3 .

[0058] In some embodiments, the vibrating structure 120 can be configured in various ways to achieve different noise reduction requirements, such as changing the distance between the vibrating structure 120 and the housing 130, or changing the structural shape or size of the vibrating structure 120, etc. For specific configuration methods, please refer to [reference needed]. Figure 14 The relevant content will not be described in detail here.

[0059] The following examples further illustrate the sound leakage reduction device provided in the embodiments of this application.

[0060] Figures 2-4 This is a schematic diagram of the structure of a sound leakage reduction device according to some embodiments of this application.

[0061] Example 1

[0062] like Figure 2 As shown, the housing 130 of the sound leakage reduction device 200 is provided with a vibration cavity 140 and a resonant cavity 150. A connecting hole 160 is provided on the side wall 170 between the vibration cavity 140 and the resonant cavity 150 to achieve air conduction communication between the two. A sound leakage hole 180 is also provided on the outer wall of the housing 130. In some embodiments, depending on the selection of the corresponding target frequency range, the sound leakage hole 180 can be provided on any outer wall of the housing 130, that is, it can be provided on the outer wall 131, or it can be provided on the outer wall 132 or the outer wall 133. In some embodiments, depending on the selection of the corresponding target frequency range, the sound leakage hole 180 can be located at any position on any outer wall of the housing, such as the middle position or the edge position of the outer wall. In some embodiments, when the sound leakage hole 180 is provided on the outer wall opposite to the side wall 170 of the resonant cavity 150 (i.e., Figure 2 When the outer wall 131 shown is used, according to the selection of the corresponding target frequency range, the sound leakage hole 180 and the connecting hole 160 can be used as follows: Figure 2 As shown in the staggered arrangement, the sound vent 180 and the connecting hole 160 can also be arranged relative to each other (i.e., not staggered). In some embodiments, in order to meet the corresponding target frequency range, different variations can be made to the size of the connecting hole 160, the size of the sound vent 180, or the size ratio between the two. For example, the diameter of the sound vent 180 can be set to be larger than the diameter of the connecting hole 160. For example, the diameter ratio of the sound vent 180 to the connecting hole 160 can be set to 3:2, so that while the resonant cavity 150 absorbs sound waves of a specific frequency through the connecting hole 160, a portion of the expected sound waves can be guided to the outside of the housing 130 more effectively.

[0063] Example 2

[0064] like Figure 3 As shown, the housing 130 of the sound leakage reduction device 300 includes a vibration cavity 140 and a resonant cavity 150. A connecting hole 160 is provided on the side wall 170 between the vibration cavity 140 and the resonant cavity 150 to achieve air conduction communication between them. Two sound leakage holes 180 and 181 are also provided on the outer wall of the housing 130. The specific positions of the sound leakage holes 180 and 181 are similar to those of the sound leakage hole 180 described in Embodiment 1, and can be referred to the relevant description in Embodiment 1 above, which will not be repeated here. In some embodiments, in order to meet the corresponding target frequency range, the size of the connecting hole 160, the size of the sound leakage hole 180, the size of the sound leakage hole 181, or the proportional relationship of the three sizes can be varied. For example, the size of the sound leakage hole 180 and the size of the sound leakage hole 181 can be set to be the same as the size of a single sound leakage hole 180 in Embodiment 1 to achieve the absorption of sound waves of the same target frequency or the absorption of sound waves of different target frequencies.

[0065] Example 3

[0066] like Figure 4 As shown, the housing 130 of the sound leakage reduction device 400 is provided with a vibration chamber 140 and a resonant chamber 150. A connecting hole 160 is provided on the side wall 170 between the vibration chamber 140 and the resonant chamber 150 to achieve air conduction communication between the two. Three sound leakage holes 180, 181, and 182 are also provided on the outer wall of the housing 130. The specific positions of the sound leakage holes 180, 181, and 182 are similar to those of the sound leakage hole 180 described in Embodiment 1. For details, please refer to the relevant description in Embodiment 1 above, and it will not be repeated here. In some embodiments, in order to meet the corresponding target frequency range, the dimensions of the connecting hole 160, the sound vent 180, the sound vent 181, the sound vent 182, or the proportional relationship of the four dimensions can be varied. For example, the dimensions of the sound vent 180 and the sound vent 181 can be set to be equivalent to the dimensions of a single sound vent 180 in Embodiment 1 or the dimensions of the sound vent 180 and the sound vent 181 in Embodiment 2, so as to achieve equivalent settings for the same target frequency range or different settings for different target frequency ranges.

[0067] Figure 5 This is a leakage curve diagram of a sound leakage reduction device according to some embodiments of this application. The horizontal axis represents the leakage frequency in Hz; the vertical axis represents the sound pressure level of the leakage sound in dB. Exemplarily, the test conditions can be that the earphone core sample is suspended and the microphone is placed behind the ear, with the measurement position 35mm in front of the panel of the vibrating structure when suspended. It should be noted that... Figure 5 All sound leakage curves and their test conditions mentioned in this application are for illustrative purposes only and should not be construed as limiting the scope of this application.

[0068] like Figure 5 As shown, Figure 1 The noise reduction device 100 shown, according to the noise reduction curve 511 obtained after testing, shows that it forms a trough region in a specific frequency range (such as 2kHz to 2.5kHz, 5kHz to 6kHz), indicating that it has a good noise reduction effect in this specific frequency range; Figure 2 The noise reduction device 200 shown, according to the noise reduction curve 512 obtained from the test, forms a trough region in a specific frequency range (e.g., 2.5kHz to 3.5kHz), indicating that it has a good noise reduction effect in this specific frequency range; Figure 3 The noise reduction device 300 shown, according to the noise reduction curve 513 obtained from the test, forms a trough region in a specific frequency range (e.g., 3.5kHz to 4.5kHz), indicating that it has a good noise reduction effect in this specific frequency range; Figure 4The noise reduction device 400 shown, according to the noise reduction curve 514 obtained by the test, forms a trough region in a specific frequency range (5.5kHz to 6kHz), indicating that it has a good noise reduction effect in this specific frequency range.

[0069] Therefore, we can conclude that, Figures 2 to 4 The sound leakage reduction devices shown all achieve sound leakage reduction effects within a specific frequency range; furthermore, depending on the different structural arrangements of their vibration cavity, resonant cavity, connecting hole, and venting hole, the specific frequency range of sound wave absorption achieved also varies; additionally, it can also be based on, for example... Figures 2 to 4 The structural transformation shown exemplarily leads to the following conclusion: in a specific frequency band (e.g., 2kHz to 6kHz), with other structural settings remaining unchanged, the more sound leakage holes are provided on the outer wall of the housing 130, the higher the target frequency for reducing sound leakage will be.

[0070] In other embodiments, the sound leakage reduction can also be differentiated by changing the structural parameters of the vibration cavity and / or resonant cavity (cavity structure shape, cavity size, volume ratio between cavities, specific cavity location, positional relationship between cavities, etc.) and / or the structural parameters of the connecting holes and / or sound leakage holes (hole shape, number of holes, hole size, etc.). This allows the sound leakage reduction devices with different structural parameter settings to achieve sound leakage reduction effects in different frequency ranges, or to enhance the sound leakage reduction effect in the same frequency range. For example, the size of one connecting hole on the side wall can be increased to replace two or more small connecting holes, and vice versa.

[0071] Figure 6 This is a sound leakage curve diagram of a sound leakage reduction device according to some embodiments of this application. For example... Figure 6 As shown, according to the leakage reduction curves obtained from the tests, the leakage reduction curve 611 of example structure 61 of the leakage reduction device shows that it forms a trough region from 5.5kHz to 6.5kHz, indicating that the resonant cavity can absorb sound waves in this frequency range and achieve the corresponding leakage reduction effect. The leakage reduction curve 621 of example structure 62 shows that it forms a trough region from 5kHz to 6kHz, indicating that the resonant cavity can absorb sound waves in this frequency range and achieve the corresponding leakage reduction effect. The leakage reduction curve 631 of example structure 63 shows that it forms a trough region from 3.7kHz to 4.2kHz, indicating that the resonant cavity can absorb sound waves in this frequency range and achieve the corresponding leakage reduction effect. Therefore, it can be seen that by adjusting the specific structural parameters of example structures 61, 62, and 63 (increasing the number of holes in the sound leakage hole, changing the cavity volume or volume ratio), leakage reduction effects in different specific frequency ranges can be achieved.

[0072] In other embodiments, besides changing the volume ratio by directly increasing or decreasing the vibration cavity volume (or adjusting the resonant cavity volume, or adjusting the volumes of the vibration cavity and the resonant cavity together), the equivalent volume of the vibration cavity and the resonant cavity can also be set by drilling holes in the outer wall. For example, let's return to... Figure 6 Compared to example structure 63, example structure 62 of the sound leakage reduction device has the same other structural parameters but a smaller volume of the vibrating cavity. Compared to example structure 63, which absorbs sound waves in the 3.7kHz to 4.2kHz frequency range (thus reducing sound leakage in this frequency range), example structure 62 achieves a higher absorption frequency in the 5kHz to 6kHz frequency range. Furthermore, compared to example structure 62, example structure 61 of the sound leakage reduction device has the same other structural parameters but adds a sound vent. Compared to example structure 62, which absorbs sound in the 5kHz to 6kHz frequency range, example structure 61 achieves a higher absorption frequency in the 5.5kHz to 6.5kHz frequency range. Therefore, it can be seen that in a specific frequency range (such as 3.5kHz to 6.5kHz), the larger the volume of the vibrating cavity, the higher the frequency range in which the corresponding sound leakage reduction effect is achieved.

[0073] By setting different structures for sound leakage reduction devices, various sound leakage reduction requirements in different frequency ranges can be achieved. For example, in a specific speaker or headphone structure, it is desirable to obtain a better sound leakage reduction effect in the frequency range of sound that is generally sensitive to the human ear (e.g., less than 5kHz). Since the frequency range achieved by the sound leakage reduction device 200 described in Embodiment 1 (e.g., 2.5kHz to 3.5kHz) and the frequency range achieved by the sound leakage reduction device 300 described in Embodiment 2 (e.g., 3.5kHz to 4.5kHz) can both meet the frequency range that is sensitive to the human ear, the sound leakage reduction device structure shown in Embodiments 1 and 2 (including other feasible equivalent structures) can be selected to achieve a better sound leakage reduction effect.

[0074] Figures 7-9 This is a schematic diagram of the structure of a sound leakage reduction device according to some embodiments of this application. Figure 10 This is a sound leakage curve diagram of a sound leakage reduction device according to some embodiments of this application.

[0075] Example 4

[0076] like Figure 7 As shown, the noise reduction device 700 is provided with a first resonant cavity 210 and a second resonant cavity 220. The first resonant cavity 210 is disposed on the first side wall 230 of the vibration cavity 140. The first resonant cavity 210 and the vibration cavity 140 are connected by air conduction through the first connecting hole 231 on the first side wall 230. The second resonant cavity 220 and the first resonant cavity 210 are connected by air conduction through the second connecting hole 241 on the second side wall 240.

[0077] In some embodiments, to obtain the frequency band of the desired leakage noise reduction within a specific frequency range, corresponding changes can be made to structural parameters such as the individual volumes or volume ratios of the two resonant cavities, the ratio of the total volume of the two resonant cavities to the volume of the resonating cavity, the number of connecting holes, the diameter of a single resonant cavity or the total diameter, the length of a single connecting hole or the total effective length of the connecting holes, and the ratios of various dimensional parameters between the connecting holes. For example, the frequency band of the leakage noise reduction within a specific frequency range can be achieved by increasing the volume of one of the resonant cavities or the ratio of the total volume of the two resonant cavities to the volume of the resonating cavity. Furthermore, in other embodiments, any possible structural changes can be employed, which are not listed here.

[0078] Example 5

[0079] like Figure 8 As shown, the noise reduction device 800 is provided with a first resonant cavity 210 and a second resonant cavity 220. The first resonant cavity 210 and the second resonant cavity 220 are both provided on the first side wall 230 of the vibration cavity 140. The first resonant cavity 210 and the vibration cavity 140 are connected by air conduction through the first connecting hole 231 on the first side wall 230, and the second resonant cavity 220 and the vibration cavity 140 are connected by air conduction through the third connecting hole 232 on the first side wall 230.

[0080] In some embodiments, to obtain the frequency band of the desired leakage reduction range, corresponding changes can be made to structural parameters such as the individual volumes or volume ratios of the two resonant cavities, the ratio of the total volume of the two resonant cavities to the volume of the resonating cavity, the number, diameter, or total diameter of the connecting holes, the length of the connecting hole pipes or the total effective length of the pipes, and the ratios of various dimensional parameters between the connecting holes. For example, reducing the volume of a certain resonant cavity or the ratio of the total volume of the two resonant cavities to the volume of the resonating cavity can reduce leakage in a specific frequency band. Furthermore, in other embodiments, any possible structural changes can be employed, which are not listed here.

[0081] Example 6

[0082] like Figure 9 As shown, the noise reduction device 900 is provided with a third resonant cavity 310 and a fourth resonant cavity 320. The third resonant cavity 310 is disposed on the first side wall 230 of the vibration cavity 140 and is connected to the vibration cavity 140 through the first connecting hole 231 on the first side wall 230. The fourth resonant cavity 320 is disposed on the third side wall 330 of the vibration cavity 140 and is connected to the vibration cavity 140 through the fourth connecting hole 331 on the third side wall 330.

[0083] like Figure 10As shown, the leakage reduction curve 1011 was obtained from testing the initial structure with only a vibrating cavity and no resonant cavity. The leakage reduction curve 1012 is... Figure 9 The sound leakage reduction device shown was tested and obtained. A comparison of the leakage reduction curves 1012 and 1011 obtained from the tests shows that the two resonant cavities of the leakage reduction device 900 are arranged in parallel on different side walls of the vibrating cavity, forming a trough region in a specific frequency range (e.g., 1.9kHz to 2.4kHz, 2.7kHz to 3.2kHz, 4.5kHz to 5kHz). Among them, the leakage reduction trough region in the specific frequency range (e.g., 1.9kHz to 2.4kHz) is generated by the setting of the fourth resonant cavity 320, and the leakage reduction trough region in the specific frequency range (e.g., 2.7kHz to 3.5kHz) is generated by the setting of the third resonant cavity 310. In the specific frequency range (e.g., 4.5kHz to 5kHz), due to the addition of the first connecting hole 231 on the first side wall 230 between the vibrating cavity 140 and the third resonant cavity 310, the depth and specific frequency range of the leakage reduction trough region of the vibrating cavity 140 have changed compared with the time before the connecting hole was not set, indicating that a significant leakage reduction effect has been achieved in multiple specific frequency ranges.

[0084] In other embodiments, according to Figure 10 As shown in the diagram, the leakage sound reduction effect can be achieved by individually or in combination with the vibration cavity (e.g., vibration cavity 140) or resonant cavity (e.g., the third resonant cavity 310 and the fourth resonant cavity 320). For example, to enhance the leakage sound reduction effect within a specific frequency range (e.g., 1.5kHz to 3kHz), the volume or connecting hole size of the vibration cavity and / or resonant cavity can be adjusted to ensure that the leakage sound troughs of the vibration cavity and / or resonant cavity fall within this smaller specific frequency range. This means the difference in leakage sound frequencies between the vibration cavity and / or resonant cavity is relatively small, for example, the difference is distributed between 0.1kHz and 0.3kHz. Furthermore, to obtain a wider specific frequency range (e.g., 1kHz), the leakage sound reduction effect can be enhanced. (Up to 5kHz), by appropriately configuring the volume or connecting hole size of the vibrating cavity and / or resonating cavity, the leakage sound wave valley regions of the vibrating cavity and / or resonating cavity can be relatively dispersed or evenly distributed within this wider frequency range. For example, the valley region generated by the fourth resonating cavity 320 is located in the frequency range of 1kHz to 2.5kHz, the valley region generated by the third resonating cavity 310 is located in the frequency range of 2.5kHz to 4kHz, and the valley region generated by the vibrating cavity 140 is located in the frequency range of 4kHz to 5kHz.

[0085] In other embodiments, if it is desired to increase or decrease the frequency band of a specific frequency range of leakage reduction, corresponding changes can be made to structural parameters such as the positions of the two resonant cavities on different sidewalls, the individual volumes or volume ratios of the two resonant cavities, the ratio of the total volume of the two resonant cavities to the volume of the vibrating cavity, the number of connecting holes, their diameters or total equivalent diameters, the length of the connecting hole pipes or the total effective length of the pipes, and the ratios of various dimensional parameters between the connecting holes. For example, the resonant cavity located on the sidewall near the vibration panel 121 of the leakage reduction device (e.g., ...) can be enlarged. Figure 9 The volume of the fourth resonant cavity 320 shown is used to reduce the frequency band of the leakage frequency range. Additionally, in other embodiments, any possible variation configuration can be employed, which will not be listed here.

[0086] In other embodiments, the sound leakage reduction effect can also be adjusted by changing the structural parameters of the vibration cavity and / or resonant cavity (number of cavities, shape of cavity structure, size of cavity, volume ratio between vibration cavity and resonant cavity, specific location of cavity, positional relationship between cavities, etc.) and / or the structural parameters of the connecting hole and / or the sound leakage hole (hole shape, number of holes, size of holes, etc.).

[0087] By using different structural variations in the noise reduction device, feasible solutions are provided to achieve noise reduction requirements in various frequency ranges. Furthermore, equivalent or modified structural settings can be made according to more detailed specific noise reduction needs, which greatly optimizes the noise reduction performance and meets the diverse needs of users.

[0088] Figure 11 This is a schematic diagram of the structure of a sound leakage reduction device according to some embodiments of this application. Figure 12 This is a sound leakage curve diagram of a sound leakage reduction device according to some embodiments of this application.

[0089] Example 7

[0090] like Figure 11 As shown, the noise reduction device 1100 includes a third resonant cavity 310, a fourth resonant cavity 320, and a fifth resonant cavity 340. The third resonant cavity 310 is located on the first sidewall 230 of the vibration cavity 140, and is air-conductedly connected to the vibration cavity 140 through a first connecting hole 231 on the first sidewall 230. The fourth resonant cavity 320 is located on the third sidewall 330 of the vibration cavity 140, and is air-conducted to the vibration cavity 140 through a fourth connecting hole 331 on the third sidewall 330. The fifth resonant cavity 340 is located on the fourth sidewall 350 of the vibration cavity 140, and is air-conducted to the vibration cavity 140 through a fifth connecting hole 351 on the fourth sidewall 350. Figure 12As shown, the leakage reduction curve 1201 was obtained from testing the initial structure with only a vibrating cavity and no resonant cavity. The leakage reduction curve 1202 is... Figure 9 The sound leakage reduction device shown was tested and obtained. Figure 12 The leakage test results shown indicate that, based on the leakage reduction curves 1201 and 1202 obtained from the test, multiple trough regions were generated in several specific frequency ranges (e.g., 1.4kHz to 1.6kHz, 2.3kHz to 2.7kHz, 3.4kHz to 3.8kHz, 4.3kHz to 4.7kHz). Specifically, the leakage reduction trough region in the specific frequency range (e.g., 1.4kHz to 1.6kHz) was generated by the setting of the third resonant cavity 310, the leakage reduction trough region in the specific frequency range (e.g., 2.3kHz to 2.7kHz) was generated by the setting of the fourth resonant cavity 320, and the leakage reduction trough region in the specific frequency range (e.g., 3.4kHz to 4.7kHz) was generated by the setting of the fourth resonant cavity 320. The leakage sound valley region (Hz to 3.8kHz) is generated by the setting of the fifth resonant cavity 340. Due to the addition of the first connecting hole 231 on the first sidewall 230 between the vibration cavity 140 and the third resonant cavity 310, the depth and specific frequency range of the leakage sound valley region of the vibration cavity 140 have changed compared with before the connecting hole was set. This indicates that a significant leakage sound reduction effect has been achieved in multiple specific frequency ranges. Compared with the leakage sound reduction device 900 described in the aforementioned embodiment 5, it has the characteristics of a lower frequency band trend and more comprehensive frequency band distribution, and a more significant low-frequency leakage sound reduction effect in a specific frequency band (such as the frequency range of 1kHz to 5kHz).

[0091] In other embodiments, according to Figure 12As shown in the diagram, the leakage sound reduction effect can be achieved by individually or in combination with the vibration cavity (e.g., vibration cavity 140) or resonant cavity (e.g., the third resonant cavity 310, the fourth resonant cavity 320, and the fifth resonant cavity 340). For example, to enhance the leakage sound reduction effect within a specific frequency range (e.g., 1kHz to 3kHz), the volume or connecting hole size of the vibration cavity and / or resonant cavity can be adjusted to ensure that the leakage sound troughs of the vibration cavity and / or resonant cavity fall within this smaller specific frequency range. This means the leakage sound frequency difference between the vibration cavity and / or resonant cavity is within a small range, for example, the difference is distributed between 0kHz and 0.2kHz. Furthermore, to obtain a wider specific frequency range (e.g., 1kHz to 6kHz), the leakage sound frequency difference between the vibration cavity and / or resonant cavity can be adjusted. The cavity is structurally configured with appropriate volume or connecting hole size so that the leakage sound wave troughs of the vibrating cavity and / or resonating cavity are relatively dispersed or evenly distributed within a wider frequency range. For example, the troughs generated by the third resonating cavity 310 are located in the 1kHz to 2kHz frequency range, the troughs generated by the fourth resonating cavity 320 are located in the 2kHz to 3.5kHz frequency range, the troughs generated by the fifth resonating cavity 340 are located in the 3.5kHz to 5kHz frequency range, and the troughs generated by the vibrating cavity 140 are located in the 5kHz to 6kHz frequency range.

[0092] In other embodiments, if it is desired to increase or decrease the frequency band of a specific range of leakage sound, corresponding changes can be made to structural parameters such as the position of the three resonant cavities on different sidewalls, the volume or volume ratio of each of the three resonant cavities, the ratio of the total volume or equivalent volume of the two resonant cavities to the volume of the resonating cavity, the number of connecting holes, their diameter or total equivalent diameter, the length of the connecting hole pipe or the total effective length of the pipe, and the ratio of various dimensional parameters between the connecting holes. For example, Figure 11 As shown, when the volume of the fourth resonant cavity 320 is larger than that of the fifth resonant cavity 340, other structural parameters remain unchanged. By increasing the volume of the resonant cavity, the frequency band where the trough representing the leakage frequency range is located is shifted to a lower frequency band. In addition, in some other embodiments, any possible structural variations can be adopted, which will not be listed here.

[0093] In other embodiments, the sound leakage reduction effect can also be adjusted by changing the structural parameters of the vibration cavity and / or resonant cavity (number of cavities, shape of cavity structure, size of cavity, volume ratio between vibration cavity and resonant cavity, specific location of cavity, positional relationship between cavities, etc.) and / or the structural parameters of the connecting hole and / or the sound leakage hole (hole shape, number of holes, size of holes, etc.).

[0094] Figure 13The leakage curve diagrams of the leakage reduction device shown in some embodiments of this application illustrate various transformation structure configurations with resonant cavities, specifically including a series-connected cavity example structure (such as...). Figure 1 As shown, two cavities in series and parallel (e.g.) Figure 9 (as shown) and series-parallel three-chamber (such as) Figure 11 As shown, by comparing the sound leakage reduction effect with the structure without a resonant cavity, the valley regions formed by adding a resonant cavity, whether it is a series one-cavity structure, a series-parallel two-cavity structure, or a series-parallel three-cavity structure, are all distributed in the frequency range of 1.5kHz to 5kHz. Compared with the structure without a resonant cavity, the sound leakage reduction sound pressure level is more than 25dB, and can reach up to 30dB. Moreover, each structure with a resonant cavity can achieve the corresponding sound leakage reduction frequency range as needed to meet the sound leakage reduction requirements of various working scenarios.

[0095] In some embodiments, the resonant cavity described in this application (such as...) Figures 1 to 4 The resonant cavity 150 Figures 7 to 9 , Figure 11 The first resonant cavity 210, the second resonant cavity 220, the third resonant cavity 310, the fourth resonant cavity 320, the fifth resonant cavity 340, etc., can be a cavity structure located inside the vibration cavity 140, formed by at least one baffle and the inner wall of the housing 130. In some embodiments, the aforementioned resonant cavity can be a cavity structure formed by one (or one) baffle and the inner walls of three sides of the housing 130. In some embodiments, the aforementioned resonant cavity can be a cavity structure formed by two (or two) baffles and the inner walls of two sides of the housing 130. In some embodiments, the aforementioned resonant cavity can be a cavity structure formed by an integrally formed baffle and the inner wall of one side of the housing 130, for example, the integrally formed baffle can be a hollow cuboid, a hollow cube, etc. In some embodiments, the aforementioned resonant cavity can be a non-closed cavity with an opening.

[0096] Figure 14 This is a schematic diagram of the structure of a noise reduction device according to some embodiments of this application. In some embodiments, the resonant cavity described in the embodiments of this application (such as...) Figures 1 to 4 The resonant cavity 150 Figures 7 to 9 , Figure 11 The first resonant cavity 210, the second resonant cavity 220, the third resonant cavity 310, the fourth resonant cavity 320, and the fifth resonant cavity 340 can perform, for example... Figure 14The resonant cavity structure transformation is shown. In the leakage reduction device 1400, one or more resonant cavities (such as resonant cavities 191, 192, 196) can be non-enclosed cavities formed by multiple baffle 190 structures or column structures disposed on the inner wall of the vibration cavity 140 (or the inner wall of the housing 130) and the inner wall of the vibration cavity 140 (such as resonant cavity 191). According to the need for leakage reduction at a specific frequency, the number of baffles 190, their height h, and the width s of the resonant cavity can be taken within a corresponding numerical range. In some embodiments, the height h and the width s of the baffles 190 of different resonant cavities (such as resonant cavities 191, 192, 196) can be the same or different. In some embodiments, the specific frequency of leakage reduction achieved by different resonant cavities (such as resonant cavities 191, 192, 196) can be the same or different. In some embodiments, the baffles 190 can be disposed on any inner wall of the vibration cavity 140 (or any inner wall of the housing 130), such as non- Figure 14 The other inner walls of the vibrating cavity 140 shown are also included. It should be noted that the deformed resonant cavity structure shown here is merely exemplary. Within the scope of the inventive concept of this application, other transformations or deformed structures can be made to achieve the corresponding specific frequency sound leakage reduction effect. The embodiments of this application are not particularly limited.

[0097] Figure 15 This is a structural schematic diagram of a sound leakage reduction device according to some embodiments of this application. For example... Figure 15 As shown, the vibration panel 121 of the vibration structure 120 and the housing 130 may have a predetermined distance d. In some embodiments, the predetermined distance d refers to the distance between the upper surface of the vibration panel 121 and the outer surface of the sidewall 123 of the housing 130. The size of the predetermined distance d can be adjusted by adjusting the height of the vibration conductor 122 outside the housing 130. The height of the vibration conductor 122 refers to the height of the vibration conductor 122 in the Y-axis direction, i.e., the vibration direction of the transducer structure 110. In some embodiments, the predetermined distance d between the vibration panel 120 and the housing 130 can affect the size of the opening (or gap) between the vibration structure 120 and the housing 130. In some embodiments, the size of the predetermined distance d between the vibration panel 121 and the housing 130 may be positively correlated with the size of the opening between the vibration structure 120 and the housing 130. Specifically, the larger the predetermined distance d between the vibration panel 121 and the housing 130, the larger the opening size between the vibration structure 120 and the housing 130; the smaller the predetermined distance d between the vibration panel 121 and the housing 130, the smaller the opening size between the vibration structure 120 and the housing 130.

[0098] In some embodiments, the additional sound leakage reduction effect on the sound leakage reduction device 1500 can be adjusted by changing the predetermined distance d between the vibration panel 121 and the housing 130, and the opening size between the vibration structure 120 and the housing 130. Specifically, the larger the predetermined distance d between the vibration panel 121 and the housing 130, and the larger the size of the hole between the vibration structure 120 and the housing 130, the stronger the sound leakage reduction capability of the sound leakage reduction device 100. Based on this, in order to adjust the additional sound leakage reduction effect on the sound leakage reduction device 1500 and improve the sound leakage reduction effect of the sound leakage reduction device 1500 to different degrees, the predetermined distance d between the vibration panel 121 and the housing 130 can be set in a relatively large range. In some embodiments, depending on the product requirements for acceptable sound leakage, the predetermined distance d can be between 0.5mm and 4mm. In some embodiments, in order to obtain a more appropriate sound leakage reduction effect, the predetermined distance d can be between 1mm and 3mm.

[0099] Figure 16 This is a leakage curve diagram of a leakage reduction device according to some embodiments of this application. Leakage curve 1601 represents the leakage curve of a leakage reduction device with a first predetermined spacing, leakage curve 1602 represents the leakage curve of a leakage reduction device with a second predetermined spacing, and leakage curve 1603 represents the leakage curve of a leakage reduction device with a third predetermined spacing. The first predetermined spacing is smaller than the second predetermined spacing, and the second predetermined spacing is smaller than the third predetermined spacing. Comparing leakage curves 1601, 1602, and 1603, it can be seen that within a specific frequency range (e.g., 4kHz-6kHz), leakage curve 1601 has the widest leakage reduction frequency range, followed by leakage curve 1602, while leakage curve 1603 shows almost no improvement in leakage reduction effect. It can also be understood that the leakage reduction effect of the leakage reduction device 1500 with different spacings (first, second, and third spacings) decreases from strong to weak. The above analysis shows that, within a specific frequency range and a specific spacing range that meets product requirements, the larger the predetermined spacing between the vibration panel 121 and the housing 130, the stronger the sound leakage reduction effect of the sound leakage reduction device 1500.

[0100] Reference Figure 15In some embodiments, the area and shape of the vibration panel 121 can affect the amount of sound leakage from the sound leakage reduction device 1500, thereby affecting its sound leakage reduction effect. Specifically, the larger the area of ​​the vibration panel 121, the weaker the sound leakage reduction effect of the sound leakage reduction device. In some embodiments, the vibration panel 121 is in contact with a human body part (e.g., the face), and sound can be transmitted to the user through the vibration panel 121. The larger the area of ​​the vibration panel 121, the larger the contact area between the vibration panel 121 and the user's body part, the stronger the received vibration sound, and the greater the sound leakage generated by the vibration panel 121. Based on this, in order to improve the sound leakage reduction capability of the sound leakage reduction device 1500, the area of ​​the vibration panel 121 can be smaller. In some embodiments, in order to meet the product requirements of a wider range of vibration panels and acceptable sound leakage, the area of ​​the vibration panel 121 can be 9mm². 2 -700mm 2 In some embodiments, to achieve a more suitable sound leakage reduction effect, the area of ​​the vibration panel 121 can be 25 mm². 2 -330mm 2 .

[0101] In some embodiments, the shape of the vibration panel 121 can be a regular and / or irregular shape such as a circle, rectangle, ellipse, or pentagon. It should be noted that the sound leakage reduction device 1500 may also not include the vibration panel 121, and the vibration transmission element 122 is in contact with the human body. The vibration generated by the transducer structure 110 is directly transmitted to the user through the vibration transmission element 122 to reduce the contact area between the vibration structure 120 and the user, thereby reducing the sound leakage of the sound leakage reduction device 1500.

[0102] Figure 17This is a leakage curve diagram of a noise reduction device according to some embodiments of this application. Leakage curve 1701 represents the leakage curve of the noise reduction device with a first vibrating panel area; leakage curve 1702 represents the leakage curve of the noise reduction device with a second vibrating panel area; leakage curve 1703 represents the leakage curve of the noise reduction device with a third vibrating panel area; and leakage curve 1704 represents the leakage curve of the noise reduction device with a fourth vibrating panel area. The vibrating panel areas, from largest to smallest, are the first vibrating panel area, the second vibrating panel area, the third vibrating panel area, and the fourth vibrating panel area. Comparing leakage curves 1701, 1702, 1703, and 1704, it can be seen that within a specific frequency range (e.g., 3kHz-5kHz), leakage curve 1701 has the worst noise reduction effect, followed by leakage curve 1702, then leakage curve 1703, and leakage curve 1704 has the best noise reduction effect. This can also be understood as the sound leakage reduction effect of the sound leakage reduction device 1500, from strongest to weakest, being sound leakage curves 1704, 1703, 1702, and 1701. Through the above analysis, it can be seen that within a specific frequency range and within a specific range of vibration panel area size that meets product requirements, the smaller the area of ​​the vibration panel 121, the smaller the contact area between the vibration panel 121 and the user's body, and the better the sound leakage reduction effect of the sound leakage reduction device 1500.

[0103] Figure 18 This is a schematic diagram of the acoustic output device according to some embodiments of this application. For example... Figure 18 As shown, the acoustic output device 1800 may include a transducer structure 110, a vibration structure 120, and a housing 130. Figure 18 The acoustic output device shown may include any of the aforementioned sound leakage reduction devices (such as sound leakage reduction device 100, sound leakage reduction device 200, sound leakage reduction device 300, etc.). One or more components in the acoustic output device 1800 may be the same as or similar to one or more components in the aforementioned sound leakage reduction devices, for example, housing 130, vibrating cavity 140, resonant cavity 150, connecting hole 160, etc.

[0104] In some embodiments, the acoustic output device 1800 may be a loudspeaker. In some embodiments, the loudspeaker may be a bone conduction loudspeaker, an air conduction loudspeaker, or a combination of bone and air conduction loudspeakers. In other embodiments, the loudspeaker may be any other feasible loudspeaker, and this application embodiment does not particularly limit this.

[0105] In some embodiments, taking a bone conduction speaker as an example, the acoustic output device 1800 can be a device that converts sound signals into mechanical vibrations of different frequencies. For example, the acoustic output device 1800 can be headphones (such as bone conduction headphones), hearing aids (such as bone conduction hearing aids), etc. The transducer structure 110 of the acoustic output device 1800 can convert sound signals into mechanical vibrations. One end of the vibration structure 120 is directly or indirectly connected to the transducer structure 110 and generates vibrations based on the mechanical vibrations of the transducer structure 110. The other end of the vibration structure 120 is in direct or indirect contact with a part of the user's body, thereby transmitting the mechanical vibrations through the user's body part (e.g., skull, bony labyrinth, etc.) to the user's auditory center, and the user receives bone conduction sound waves. In some embodiments, the headphones can be over-ear headphones, ear-hook headphones, behind-the-ear headphones, in-ear headphones, open-back headphones, split headphones, over-ear headphones, neckband headphones, neckband headphones, or glasses headphones, etc. The embodiments of this application do not particularly limit the specific structural style of the aforementioned headphones.

[0106] In some embodiments, the vibration structure 120 may include a vibration panel 121 and a vibration conductor 122. The vibration panel 121 may be located at the end of the vibration structure 120 away from the transducer structure 110, and the vibration conductor 122 may be located at the end of the vibration structure 120 closer to the transducer structure 110. The vibration panel 121 and the vibration conductor 122 are connected. An opening may be provided on the side wall 123 of the housing 130, through which the vibration conductor 122 passes, so that one end of the vibration conductor 122 (the end away from the vibration panel 121) can extend into the vibration cavity 140 and be connected to the housing support 410.

[0107] In some embodiments, the housing bracket 410 may be part of the housing 130 or a separate component, directly or indirectly connected to the interior of the housing 130. In some embodiments, the housing bracket 410 may be fixed to the inner surface of the housing 130. In some embodiments, the housing bracket 410 may be glued to the housing 130, for example, elastically connected to the housing 130 by an elastic connector 430, or fixed to the housing 130 by stamping, injection molding, snap-fitting, riveting, threaded connection, or welding. The embodiments of this application do not impose any particular limitation.

[0108] In some embodiments, the housing support 410 may be provided with at least one support hole 411. The support hole 411 can lead the vibration sound waves in the vibration cavity 140 out of the housing 130, interfering with the leakage sound waves generated by the vibration of the housing 130, thereby reducing the amplitude of the leakage sound waves and thus reducing the sound leakage of the acoustic output device 1800. In some embodiments, the support hole 411 may be circular, elliptical, rectangular, or other regular and / or irregular shapes, and this application embodiment does not impose any particular limitation. The number of support holes 411 can be adaptively adjusted according to the application scenario of the acoustic output device 1800, and this application embodiment does not impose any particular limitation.

[0109] In some embodiments, the transducer structure 110 may include a magnetic circuit device 111, a coil 112, and a vibration transducer 113. The transducer structure 110 may be located inside the housing 130 and disposed on the housing support 1510. One end of the vibration transducer 113 is connected to the magnetic circuit device 111, and the other end of the vibration transducer 113 is connected to the housing support 410, and is connected to the vibration structure 120 (e.g., a vibration conductor 122) through the housing support 410. In some embodiments, the coil 112 may be fixed on the housing support 410 and drive the vibration structure 120 to vibrate through the housing support 410.

[0110] In some embodiments, the magnetic circuit device 111 can be used to form a magnetic field, and the coil 112 can undergo mechanical vibration in the magnetic field. Specifically, a signal current can be passed through the coil 112. The coil 112 is located in the magnetic field formed by the magnetic circuit device 111 and is subjected to the Ampere force in the magnetic field, thus receiving a drive to generate mechanical vibration. The mechanical vibration of the coil 112 can be transmitted to the housing support 410, and the housing support 410 further transmits the mechanical vibration to the vibration structure 120. The mechanical vibration is then transmitted to the user through the vibration conductor 122 and the vibration panel 121 in the vibration structure 120.

[0111] In some embodiments, the magnetic circuit device 111 may include one or more magnetic elements (not shown in the figure). These magnetic elements can be selected from any feasible structural form, such as a toroidal magnetic element, etc. In some embodiments, multiple magnetic elements can increase the total magnetic flux. The interaction between different magnetic elements can suppress magnetic field leakage, increase the magnetic induction intensity at the magnetic gap, and improve the sensitivity of the speaker (such as a bone conduction speaker). In some embodiments, the magnetic circuit device 111 may include a magnetically conductive element (not shown in the figure). This element can be selected from any feasible structural form, such as a magnetically conductive plate or a magnetically conductive cover, etc. In some embodiments, the magnetically conductive cover can enclose the magnetic circuit generated by the magnetic circuit device 111, concentrating more magnetic field lines within the magnetic gap in the magnetic circuit device 111, thereby suppressing magnetic leakage, increasing the magnetic induction intensity at the magnetic gap, and improving the sensitivity of the speaker (such as a bone conduction speaker).

[0112] In some embodiments, an ear hook element 420 may be provided on the housing 130 of the acoustic output device 1800. The ear hook element 420 can be used to assist the user in wearing the acoustic output device 200. In some embodiments, the ear hook element can be a connector for connecting a headband to a headset. Taking the acoustic output device 200 as a rear-mounted bone conduction device as an example, the end of the ear hook element 420 can be connected to the side wall of the housing 130 of the acoustic output device 1800. When the user wears the acoustic output device 1800, the end of the ear hook element 420 can be located near the user's auricle, so that the acoustic output device 1800 is located near the user's auricle. Furthermore, by changing the position of the housing 130 relative to the ear hook element 420 and / or the shape and structure of the ear hook element 420, the position, distance, etc. of the acoustic output device 1800 relative to the user's auricle can be adjusted.

[0113] In some embodiments, the connection between the housing 130 of the acoustic output device 1800 and the ear hook element 420 can be a fixed connection. A fixed connection can refer to a connection method such as bonding, riveting, or integral forming. In some embodiments, the connection between the acoustic output device 1800 and the ear hook element 420 can also be a detachable connection. A detachable connection can refer to a connection method such as a snap-fit ​​connection or a threaded connection.

[0114] In some embodiments, the structural shape of the ear hook element 420 can be any shape that fits the auricle, such as arc, semi-circle, or zigzag. The structural shape of the ear hook element 420 can be adaptively adjusted according to the user's needs, and this application embodiment does not impose any particular limitation.

[0115] In some embodiments, the vibrating structure 120 and the housing 130 can be elastically connected, i.e., fixedly connected in an elastic manner. For example, in some embodiments, the acoustic output device 1800 may include an elastic connector 430. The elastic connector 430 may be located in the vibration cavity 140 and used to connect the vibrating structure 120 and the housing 130. Specifically, one end of the elastic connector 430 may be connected to the vibration conductor 122 of the vibrating structure 120, and the other end of the elastic connector 430 may be connected to the inner wall of the housing 130. When the mechanical vibration generated by the transducer structure 110 is transmitted to the vibration conductor 122, the vibration conductor 122 vibrates in response to the mechanical vibration generated by the transducer structure 110 and transmits the vibration signal to the housing 130 through the elastic connector 430, causing the housing 130 to vibrate mechanically.

[0116] In some embodiments, the elastic connector 430 can be in the shape of a round tube, square tube, irregularly shaped tube, ring, or plate, etc., and this application embodiment does not impose any particular limitation. In some embodiments, the elastic connector 430 can be an elastic element. The material of the elastic element can be a material capable of elastic deformation, such as silicone, metal, rubber, etc., and this application embodiment does not impose any particular limitation. In the embodiments of this application, the elastic element is more likely to undergo elastic deformation than the housing 130, allowing the housing 130 to move relative to the transducer structure 110.

[0117] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application. Furthermore, this application uses specific terms to describe embodiments of this application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this application do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application can be appropriately combined.

[0118] Furthermore, unless expressly stated in the claims, the order of processing elements and sequences, the use of numbers and letters, or other names described in this application are not intended to limit the order of the processes and methods of this application. Although the foregoing disclosure has discussed some currently considered useful embodiments of the invention through various examples, it should be understood that such details are for illustrative purposes only, and the appended claims are not limited to the disclosed embodiments; rather, the claims are intended to cover all modifications and equivalent combinations that conform to the substance and scope of the embodiments of this application. For example, while the system components described above can be implemented using hardware devices, they can also be implemented solely through software solutions, such as installing the described system on existing servers or mobile devices.

[0119] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments of the invention, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.

[0120] In some embodiments, numbers describing the quantity of components and attributes are used. It should be understood that such numbers used in the description of embodiments are modified in some examples with the terms "approximately," "approximately," or "generally." Unless otherwise stated, "approximately," "approximately," or "generally" indicates that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may be changed depending on the characteristics required by individual embodiments. In some embodiments, numerical parameters should take into account specified significant digits and employ a general method of digit reservation. Although the numerical ranges and parameters used to confirm their breadth of scope in some embodiments of this application are approximate values, in specific embodiments, such values ​​are set as precisely as feasible.

[0121] Finally, it should be understood that the embodiments described in this application are merely illustrative of the principles of the embodiments of this application. Other modifications may also fall within the scope of this application. Therefore, alternative configurations of the embodiments of this application are considered as examples and not limitations, and are regarded as consistent with the teachings of this application. Accordingly, the embodiments of this application are not limited to the embodiments explicitly described and illustrated in this application.

Claims

1. A sound leakage reduction device for an acoustic output device, characterized in that, The device includes a transducer structure, a vibrating structure, and a housing. The housing has an ear hook element for assisting the user in wearing the acoustic output device and has a vibrating cavity and at least one resonant cavity. The volume of each resonant cavity is smaller than the volume of the vibrating cavity, and the volume ratio between each resonant cavity and the vibrating cavity is not less than 0.

1. The transducer structure is located inside the vibrating cavity. One end of the vibrating structure is connected to the transducer structure, and the other end of the vibrating structure is in contact with the user's body part to transmit the mechanical vibration of the transducer structure to the user's auditory center via bone conduction. The at least one resonant cavity is connected to the vibrating cavity through at least one connecting hole and is used to absorb sound of a specific frequency generated by the transducer structure in the vibrating cavity, thereby suppressing sound leakage generated by the sound leakage reduction device at the specific frequency, which is in the range of 20 Hz to 10000 Hz.

2. The sound leakage reduction device according to claim 1, characterized in that, The at least one resonant cavity includes multiple resonant cavities, which are disposed on the same sidewall or different sidewalls of the vibration cavity and are connected to the vibration cavity through at least one of the connecting holes.

3. The sound leakage reduction device according to claim 2, characterized in that, The at least one resonant cavity includes a first resonant cavity and a second resonant cavity. The first resonant cavity is disposed on a first side wall of the vibration cavity. The first resonant cavity and the vibration cavity are connected by air conduction through a first connecting hole on the first side wall. The first resonant cavity and the second resonant cavity are connected by air conduction through a second connecting hole on the second side wall of the first resonant cavity.

4. The sound leakage reduction device according to claim 2, characterized in that, The at least one resonant cavity includes a first resonant cavity and a second resonant cavity. The first resonant cavity and the second resonant cavity are both disposed on the first sidewall of the vibration cavity. The first resonant cavity and the vibration cavity are connected by air conduction through a first connecting hole on the first sidewall, and the second resonant cavity and the vibration cavity are connected by air conduction through a third connecting hole on the first sidewall.

5. The sound leakage reduction device according to claim 2, characterized in that, The at least one resonant cavity includes a third resonant cavity and a fourth resonant cavity. The third resonant cavity is disposed on the first side wall of the vibration cavity and is air-conducted to the vibration cavity through a first connecting hole on the first side wall. The fourth resonant cavity is disposed on the third side wall of the vibration cavity and is air-conducted to the vibration cavity through a fourth connecting hole on the third side wall.

6. The sound leakage reduction device according to claim 1, characterized in that, The outer wall of the vibration cavity and / or the resonant cavity has a sound leakage hole.

7. The sound leakage reduction device according to claim 6, characterized in that, The connecting hole and / or the sound venting hole are through holes, and / or, the opening of the connecting hole and / or the sound venting hole is provided with a damping layer.

8. The sound leakage reduction device according to any one of claims 1 to 6, characterized in that, The resonant cavity is a cavity structure located inside the vibration cavity and formed by at least one baffle and the inner wall of the shell.

9. The sound leakage reduction device according to claim 1, characterized in that, The volume ratio between each resonant cavity and the vibrating cavity is 0.1 to 1.

10. The sound leakage reduction device according to any one of claims 1 to 6, characterized in that, The volume of each resonant cavity is no more than 6500 mm. 3 .

11. The sound leakage reduction device according to claim 10, characterized in that, The volume of each resonant cavity is no greater than 2100 mm². 3 .

12. The sound leakage reduction device according to any one of claims 1 to 6, characterized in that, The area of ​​each connecting hole is not less than 0.05 mm. 2 .

13. The sound leakage reduction device according to any one of claims 1 to 6, characterized in that, The distance between the vibrating structure and the shell ranges from 1 mm to 3 mm.

14. The sound leakage reduction device according to any one of claims 1 to 6, characterized in that, The vibration surface area of ​​the vibrating structure is 9 mm. 2 ~700 mm 2 .

15. An acoustic output device, characterized in that, Includes the sound leakage reduction device according to any one of claims 1 to 14.

16. The acoustic output device according to claim 15, characterized in that, The vibration structure includes a vibration panel and a vibration conductor. The vibration conductor extends into the vibration cavity through the opening in the housing and is connected to the housing support. The transducer structure is disposed on the housing support.

17. The acoustic output device according to claim 16, characterized in that, The housing support is provided with support holes.

18. The acoustic output device according to any one of claims 15 to 17, characterized in that, The vibrating structure is elastically connected to the shell.

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