TW202318885A - Sound leakage reduction device and acoustic output device - Google Patents

Abstract

The present disclosure discloses a sound leakage reduction device which relates to the technical field of sound conduction. The device includes: a transducer structure, a vibration structure and a shell. The shell may be provided with a vibration cavity and at least one resonant cavity; the transducer structure may be within the vibration cavity, and may be connected with the vibration cavity; the at least one resonant cavity may communicate with the vibration cavity through at least one through hole, and a volume of each of the at least one resonant cavity may be smaller than a volume of the vibration cavity. The sound leakage reduction device and an acoustic output device provided by the present disclosure effectively reduced a sound leakage in the process of sound conduction, and may realize the adjustment of sound leakage reduction in multiple frequency bands.

Description

Sound leakage reduction device and acoustic output device

The present application relates to the technical field of sound conduction, and more specifically, to a sound leakage reducing device and an acoustic output device.

This application claims the priority of the Chinese patent application with application number 202111234536.6 filed on October 22, 2021, the entire contents of which are incorporated herein by reference.

A speaker with bone conduction as one of the main transmission methods of sound, its sound transmission (sound conduction) vibrating part can perform mechanical vibration according to an electrical signal (for example, a control signal from a signal processing circuit), and generate a conductive sound wave based on the mechanical vibration, and finally transmitted to the human body. In the process of mechanical vibration, the sound-transmitting vibration parts of the traditional speaker will transmit the mechanical vibration to the shell structure of the speaker, causing the shell structure to vibrate. The vibration of the shell structure will push the surrounding air to vibrate, resulting in sound leakage. Affect the sound transmission performance of the speaker.

At present, by setting the sound-absorbing structure on the vibration device of the speaker itself, for example, adding a damper between the sound transmission vibration part and the shell structure to weaken the sound leakage generated by the shell structure; or, punching holes in the shell structure , the sound in the shell is remitted out of the shell and interferes with the sound leakage to reduce the sound leakage. However, these methods cannot effectively solve the problem of sound leakage in a specific frequency band, and cannot meet the diversified needs of reducing sound leakage in multiple frequency ranges.

The embodiment of the present invention effectively reduces the sound leakage of a specific frequency band generated by the sound conduction process by providing the sound leakage reducing device and the acoustic output device, and can realize the adjustment of the sound leakage reduction in multiple frequency bands.

One of the embodiments of the present invention provides a sound leakage reducing device, including a transducing structure, a vibrating structure and a casing; the casing has a vibrating cavity and at least one resonant cavity; the transducing structure is located in the vibrating cavity, and Connected with the vibration structure; the at least one resonance cavity communicates with the vibration cavity through at least one communication hole, and the volume of each resonance cavity in the at least one resonance cavity is smaller than the volume of the vibration cavity.

One of the embodiments of the present invention provides an acoustic output device, including the noise leakage reduction device described in any solution of the embodiments of the present invention.

The sound leakage reducing device and the acoustic output device provided by the embodiments of the present invention can adjust the sound leakage frequency generated by the sound leakage reducing device in the sound conduction process through the provided resonant cavity, and effectively reduce the sound leakage by absorbing or offsetting the sound leakage frequency. In addition, a variety of transformable or equivalent structure settings can be made on the cavity structure of the resonator to achieve the adjustment of leakage reduction in a variety of specific frequency ranges, thereby meeting various requirements for leakage reduction and optimizing the The sound transmission performance of the sound conduction device such as the loudspeaker further improves the hearing effect of the user and improves the user experience.

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings that need to be used in the description of the embodiments. Apparently, the accompanying drawings in the following description are only some examples or embodiments of the present invention, and for those skilled in the art, the present invention can also be translated according to these drawings without making progressive efforts. The invention applies to other similar scenarios. Unless otherwise apparent from context or otherwise indicated, like reference symbols in the drawings represent like structures or operations.

It should be understood that "system", "device", "unit" and/or "module" as used herein is a method for distinguishing different elements, components, parts, parts or assemblies of different levels. However, the words may be replaced by other expressions if other words can achieve the same purpose.

As shown in the specification and claims, words such as "a", "an", "an" and/or "the" do not refer to the singular, and may also include the plural, unless the context clearly indicates an exception. Generally speaking, the terms "comprising" and "comprising" only suggest the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or device may also contain other steps or elements.

The flow chart is used in the present invention to illustrate the operations performed by the system according to the embodiment of the present invention. It should be understood that the preceding or following operations are not necessarily performed in the exact order. Instead, various steps may be processed in reverse order or simultaneously. At the same time, it is also possible to add other operations to these processes, or to remove a step or several steps from these processes.

Fig. 1 is a schematic structural diagram of a sound leakage reducing device according to some embodiments of the present invention.

The sound leakage reducing device 100 may include a transducing 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 transducing structure 110 is located in the vibrating cavity 140 and is connected to the vibrating structure 120 , the resonance cavity 150 communicates with the vibration cavity 140 through at least one communication hole 160 , wherein the volume of the resonance cavity 150 is smaller than the volume of the vibration cavity 140 . The transducing structure 110 can drive the vibrating structure 120 to vibrate to generate sound transmitted to the human ear. The resonant cavity 150 is used to absorb the sound of a specific frequency generated by the transducing structure 110 in the vibrating cavity 140, thereby suppressing the sound leakage reduction device 100 from Leakage at specific frequencies.

The sound leakage reducing device 100 may be a device for reducing sound leakage of a speaker. In some embodiments, the sound leakage reducing device 100 may be a speaker with bone conduction as one of the main modes of sound transmission. For example, the vibrating structure 120 can be in contact with the skin of the user's face in a large area and transmit its mechanical vibration to the skin so that the user can hear the sound. In some embodiments, the speaker may be a bone conduction speaker, an air conduction speaker, or a combined bone and air conduction speaker. In other embodiments, the speaker may be any other feasible speaker, which is not specifically limited in this embodiment of the present invention. Taking the bone conduction speaker as an example, the resonant cavity 150 in the sound leakage reducing device 100 can absorb the sound of a specific frequency generated by the transducing structure 110 in the vibration cavity (that is, the vibration cavity in the form of bone conduction), thereby suppressing the sound generated at a specific frequency. leaking sound.

The transducer structure 110 is a component that converts electrical signals into mechanical vibrations. In some embodiments, the transducer structure 110 may adopt a magnetic element and a voice coil structure, that is, the audio electric signal is input into the voice coil through electromagnetic action, and the voice coil is placed in a magnetic field to drive the vibration of the voice coil. In some embodiments, the transducer structure 110 may adopt a piezoelectric ceramic structure, which converts electrical signals into shape changes of ceramic components to generate vibrations. In some other embodiments, the transducer structure 110 may adopt any other feasible structural form, which is not particularly limited in this embodiment of the present invention.

In some embodiments, the transducer structure 110 can use specific magnetic circuit elements and vibrating elements to convert signals containing sound information into mechanical vibrations. In some embodiments, the aforementioned conversion process may include the coexistence and conversion of multiple different types of energy. For example, electrical signals can be directly converted into mechanical vibrations through the transducer structure 110 to generate sound. For another example, sound information can be included in the light signal, and the process of converting the light signal into a vibration signal can be realized through the specific transducing structure 110 . For another example, the types of energy coexisting and converted in the working process of the transducer structure 110 may also include other types, such as heat energy, magnetic field energy, and the like. In some embodiments, the energy conversion methods of the transducing structure 110 may include moving coil, electrostatic, piezoelectric, moving iron, pneumatic, electromagnetic, and the like. In some embodiments, the vibrating body of the vibrating element in the transducing structure 110 may be a mirror symmetrical structure, a central symmetrical structure or an asymmetrical structure. In some embodiments, the vibrating body may be a torus structure, and a plurality of struts converging toward the center are arranged in the torus, and the number of the struts may be two or more. In some embodiments, the vibrating body may be provided with discontinuous hole-like structures, so that the vibrating body can generate greater displacement, thereby increasing the output power of vibration and sound, and achieving higher sensitivity.

The casing 130 is an outer shell structure for accommodating the energy-transforming structure 110 and forming the vibration cavity 140 . In some embodiments, the housing 130 may be a single-cavity structure for accommodating the transducing structure 110 . In some embodiments, the casing 130 may be a multi-cavity structure (that is, more than one vibration cavity is formed) for accommodating the transducer structure 110 . In some embodiments, the structural shape of the housing 130 may be cylindrical, square or any other feasible structural shape. In some other embodiments, the casing 130 may adopt other feasible structural forms or structural shapes, which are not particularly limited in this embodiment of the present invention.

The vibration chamber 140 is a vibration chamber formed by the casing 130 and the transducing structure 110 inside the casing 130 . In some embodiments, the mechanical vibration generated by the transducing structure 110 is transmitted to the vibrating structure 120, and the vibrating structure 120 vibrates synchronously driven by the transducing structure 110, and at the same time, the vibration of the transducing structure 110 relative to the casing 130 will also be Sound waves are generated in the vibrating cavity 140 .

In some embodiments, the transducing structure 110 can form a magnetic field in the vibrating cavity, and the magnetic field can be used to convert a signal containing sound information into a vibration signal. In some embodiments, the aforementioned audio information may include video or audio files in a specific data format, or data or files that can be converted into audio through specific channels. In some embodiments, the above-mentioned signal containing sound information may come from a storage element of the sound leakage reducing device 100 itself, or from an information generation, storage or transmission system outside the sound leakage reducing device 100 . In some embodiments, the aforementioned signal containing sound information may include one or a combination of electrical signals, optical signals, magnetic signals, mechanical signals, and the like. In some embodiments, the aforementioned signal containing audio information may come from one signal source or multiple signal sources. In some embodiments, the aforementioned multiple signal sources may or may not be correlated.

In some embodiments, the sound leakage reducing device 100 can acquire the aforementioned signal containing sound information in a variety of different ways, and the acquisition of the signal can be wired or wireless, and can be immediate or delayed. For example, the sound leakage reducing device 100 may receive electrical signals containing sound information through wired or wireless means, or may directly obtain data from a storage medium (eg, a storage element) to generate sound signals. For another example, the sound leakage reducing device 100 may include components with a sound collection function. By picking up the sound in the environment, the mechanical vibration of the sound is converted into an electrical signal, which is processed by an amplifier to obtain an electrical signal that meets specific requirements. In some embodiments, the aforementioned storage medium can store a signal containing audio information. In some embodiments, the foregoing storage medium may adopt any feasible storage form, for example, may include one or more storage devices and the like.

The vibrating structure 120 may be a component that transmits mechanical vibrations to human ears, specifically, transmits mechanical vibrations through human skin (eg, facial skin). In some embodiments, the vibration structure 120 may include a vibration panel 121 and a vibration conductor 122 . The end of the vibration conducting member 122 away from the transducing structure 110 may be located outside the housing 130 and connected to the vibration panel 121 also located outside the housing 130 . The other end of the vibration conductor 122 (the end away from the vibration panel 121 ) can extend through the housing 130 into the vibration chamber 140 , so that a part of the vibration conductor 122 is located in the generation chamber 140 and connected to the transducer structure 110 . The mechanical vibration generated by the transducer structure 110 can be transmitted to the vibration panel 121 through the vibration conductor 122, and the vibration panel 121 is in contact with human skin (for example, facial skin), and then the mechanical vibration (that is, bone conduction sound wave) is transmitted to the user human ear.

In some embodiments, the structural shape of the vibrating panel 121 may be cylindrical, square or any other feasible structural shape. In some other embodiments, the vibrating panel 121 may adopt other feasible structural forms or structural shapes, which are not particularly limited in this embodiment of the present invention.

In some embodiments, the connection manner between the vibrating structure 120 and the transducing structure 110 is not limited to the above-mentioned direct connection, and may also be an indirect connection. For example, the sound leakage reducing device 100 can also include a connecting piece (not shown), the connecting piece can be located in the vibration chamber 140, one end of the connecting piece can be connected with the inner wall of the housing 130, and the other end of the connecting piece can be connected with the vibrating structure 120. (for example, the vibration conductor 122) connection. The mechanical vibration generated by the transducer structure 110 can be transmitted to the casing 130 , the vibration of the casing 130 can be transmitted to the vibration conductor 122 of the vibration structure 120 through the connecting piece, and the bone-conducted sound wave can be transmitted to the user through the vibration panel 121 . In some embodiments, the element on the casing 130 used to close the upper surface of the casing can be used as a connecting piece to connect the vibration panel 121 and the vibration conducting piece 122, without requiring an additional component as a connecting piece to improve the vibration transmission efficiency. At the same time, it has the advantage of compact structure.

In some embodiments, the housing 130 may be integrally formed. In some embodiments, the housing 130 may also be assembled by inserting, clamping and the like. In some embodiments, the housing 130 can be made of metal materials (for example, copper, aluminum, titanium, gold, etc.), alloy materials (for example, aluminum alloy, titanium alloy, etc.), plastic materials (for example, polyethylene, polypropylene, Epoxy resin, nylon, etc.), fiber materials (for example, acetate, propionate, carbon fiber, etc.). In some embodiments, a sheath can be provided on the outside of the housing 130 , and the sheath can be made of a soft material with certain elasticity, such as soft silicone rubber, rubber, etc., to provide a better tactile feeling for the user to wear.

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

，（1） 其中，f ₀表示亥姆霍茲共振腔體的中心頻率，r表示亥姆霍茲共振腔體的管道半徑，l ₀表示亥姆霍茲共振腔體的管道長度，S表示亥姆霍茲共振腔體的管道截面面積，V ₀表示亥姆霍茲共振腔體的容積，c表示空氣中的聲音傳播的速度。 Exemplarily, for ease of understanding, the resonant cavity 150 can be equivalent to a Helmholtz resonant cavity. When the frequency of the leakage sound wave in the vibration cavity 140 is consistent with the natural frequency of the resonant cavity 150, resonance occurs, and the leakage sound wave It rubs against the inner wall of the resonant cavity 150 to consume sound energy and achieve the purpose of sound absorption. Among them, the center frequency of the Helmholtz resonant cavity can be calculated by formula (1):

, (1) Among them, f ₀ represents the center frequency of the Helmholtz resonant cavity, r represents the pipe radius of the Helmholtz resonant cavity, l ₀ represents the pipe length of the Helmholtz resonant cavity, S represents the The pipe cross-sectional area of the Helmholtz resonance cavity, V ₀ represents the volume of the Helmholtz resonance cavity, and c represents the speed of sound propagation in the air.

In some embodiments, a sound leakage hole may be provided on the shell of the housing 130, so that the sound waves in the vibration chamber 140 can flow out of the housing 130 and interfere with and cancel the sound leakage waves generated by the vibration of the housing 130 to reduce the sound leakage. . Although this method of reducing sound leakage reduces sound leakage to a certain extent, the effect of reducing sound leakage for specific frequency sound waves is not ideal in a wide frequency range. By further adding a resonant cavity 150 outside the vibrating cavity 140, and adjusting the structure and arrangement of the vibrating cavity 140 and the resonating cavity 150, it is possible to absorb sound waves in a specific frequency range in the vibrating cavity 140 in a targeted manner, thereby reducing the noise from the sound leakage hole. Adjust the sound waves emitted from the hole, so as to improve the sound leakage reduction effect of setting the sound leakage hole. In some embodiments, no sound leakage holes may be provided on the shell of the housing 130. At this time, the vibration formed when the resonant cavity 150 absorbs part of the sound waves in the vibration cavity 140 can adjust the vibration of the housing 130, and can also The effect of reducing the sound leakage of the casing 130 is achieved.

In some embodiments, the resonant cavity 150 may be a resonant cavity added on the basis of the vibratory cavity 140 . For example, the resonant cavity 150 and the vibrating cavity 140 may share a side wall, and the acoustic communication is realized through one or more communication holes 160 on the side wall. In some embodiments, the resonant cavity 150 may be a resonant cavity independent of the vibrating cavity 140 . For example, the resonant cavity 150 and the vibrating cavity 140 respectively have independent side walls, and are acoustically communicated with each other through one or more sound guide tubes. In some embodiments, the resonant cavity 150 may include one resonant cavity or multiple resonant cavities. In some embodiments, between the vibrating cavity 140 and the resonating cavity 150 , or between multiple resonating cavities of the resonating cavity 150 , at least one hole capable of realizing air conduction communication is provided. Exemplarily, as shown in FIG. 1 , at least one communication hole 160 (which can be regarded as a pipe part of the Helmholtz resonance cavity) may be provided on the side wall 170 for separating the resonance cavity 150 from the vibration cavity 140, at least one The communication hole 160 is used to realize air conduction communication between the vibrating cavity 140 and the resonance cavity 150 . In some other embodiments, the resonant cavity 150 may also be any other feasible resonant cavity, which is not particularly limited in the embodiment of the present invention.

In some embodiments, the cavity wall (such as the side wall 170 ) of the resonance cavity 150 may be made of the same material as that of the casing 130 . In some embodiments, the resonant cavity 150 can be made of metal materials (for example, copper, aluminum, titanium, gold, etc.), alloy materials (for example, aluminum alloy, titanium alloy, etc.), plastic materials (for example, polyethylene, polypropylene, Epoxy resin, nylon, etc.), fiber materials (for example, acetate, propionate, carbon fiber, etc.).

In the embodiment of the present invention, a resonant cavity is added in addition to the traditional vibrating cavity, and the specific structure of the resonating cavity can absorb or offset the sound wave of a specific frequency in the vibrating cavity, thereby satisfying the effect of reducing the sound leakage of the casing. In addition, this structural arrangement has the advantages of simple structure and easy processing.

In some embodiments, the resonant cavity 150 can reduce sound leakage of a specific frequency, that is, absorb sound waves of a specific frequency range. The sound waves of the specific frequency range may be in the frequency range of 20 Hz to 10000 Hz (10 kHz). In some embodiments, the sound waves in the specific frequency range may be located in a frequency range to which the human ear is more sensitive, for example, a frequency range of 1 kHz to 3 kHz, so as to improve the sound leakage reduction effect in this frequency range.

In some embodiments, in order to realize that the sound leakage reducing device 100 meets various sound leakage reducing requirements of various sound conduction scenarios (for example, reducing sound leakage in a specific frequency range, etc.), various structural transformations can be performed on the sound leakage reducing 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 side wall (as shown in FIG. 8 ) or different side walls (as shown in FIG. 9 ) of the vibration cavity 140. Each resonant cavity 150 may communicate with the vibrating cavity 140 through at least one communication hole 160 or a sound guide tube for air conduction. For example, as shown in Figure 1, Figure 7, and Figure 11, the number of resonant cavities 150 can be changed and set, and the number of resonant cavities 150 can be set to one or multiple; The position is changed and set, the resonant cavity 150 can be set on any side wall of the housing 130, and different resonant cavities 150 can be set on the same side wall or on different side walls. For another example, the number of communicating holes 160 may be one or more. In some embodiments, different settings can be made on the number of cavities, the size of the cavities, the specific location of the cavities, the positional relationship between the cavities, and the structural shape of the cavities according to different requirements for reducing sound leakage. The embodiments of the present invention are not particularly limited.

In some embodiments, in order to enable the resonant cavity 150 to absorb sound waves within the target frequency range, according to the formula (1) and in combination with the actual size of the vibrating cavity 140, the distance between one (or each) resonating cavity 150 and the vibrating cavity 140 The volume ratio is not less than 0.1, so that the resonant cavity and the vibrating cavity can achieve the sound leakage reduction effect of a specific frequency within the widest possible volume range. In some embodiments, in some embodiments, the volume ratio between each resonance cavity 150 and the vibration cavity 140 is 0.1 to 1, so that the resonance cavity and the vibration cavity can also be realized within a wide range of volume values. Leakage reduction effect for specific frequencies. The volume ratio between a resonant cavity 150 and the vibrating cavity 140 can be set to 1/10 to 1/1, or 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 Cavity 220, another example, the volume ratio between the third resonant cavity 310, the fourth resonant cavity 320 and the fifth resonant cavity 340) and the vibrating cavity 140 volume can be set to 1/10 to 1/1, so that the resonant cavity is performing When absorbing sound waves, it covers the possible frequency range of leakage sound and improves the efficiency of sound leakage reduction. In some embodiments, according to the selection of the target frequency range, the volume ratio between one resonant cavity 150 and the vibrating cavity 140 can be set to 1/8 to 2/3, or the volume of a single resonant cavity or the total volume of multiple resonant cavities The volume ratio between the volume (such as the first resonant cavity 210 or the second resonant cavity 220, and 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 an appropriate size range, the volume ratio between one resonant cavity 150 and the vibrating cavity 140 can be set to 1/5 to 1/2, or a single resonant cavity The volume of the cavity or the total volume of multiple resonant cavities (such as the first resonant cavity 210 or the second resonant cavity 220, another example, the third resonant cavity 310, the fourth resonant cavity 320 and the fifth resonant cavity 340) and the vibrating cavity 140 The volume ratio between can be set from 1/5 to 1/2. In some embodiments, a single resonant cavity or multiple resonant cavities (such as the resonant cavity 150, the first resonant cavity 210 or the second resonant cavity 220, another example, the third resonant cavity 310, the fourth resonant cavity 320 and the fifth resonant cavity The leakage frequency range of the cavity 340) can be calculated according to the formula (1).

In some embodiments, a sound leakage hole 180 may be provided on the outer wall of the vibrating cavity and/or the resonating cavity, so that on the basis of reducing sound leakage in the resonating cavity 150, part of the sound waves in the vibrating cavity can be extracted to the outside of the housing 130 and The vibration of the shell 130 pushes the air outside the shell to form a sound leakage sound wave that interferes to reduce the amplitude of the leakage sound, thereby further reducing the leakage sound. Through the convenient improvement of further opening holes on the shell, the sound leakage reduction effect can be further optimized without increasing the structural volume and weight.

In some embodiments, according to different sound leakage reduction requirements, the number of holes, the size of the holes and the size ratio between the holes, the location of the holes and/or the shape of the hole structure (for example, The shape of the hole structure is a round hole or a square hole, and for example, the shape of the hole structure is a connected hole or a non-connected hole, etc.). For example, the ratio of the diameter D1 of the communication hole 160 to the diameter D2 of the sound leakage hole 180 can be set to 1/2 to 2, and the ratio of the pipeline length L1 of the communication hole 160 to the pipeline length L2 of the sound leakage hole 180 can be set to 1 /2 to 2. In some embodiments, the communication hole 160 or the sound leakage hole 180 may be an air conduction (ie, air conduction) communication hole. In some embodiments, the communication hole 160 may be a communication hole for realizing communication between the vibration cavity 140 and the resonant cavity 150 . In some embodiments, the sound leakage hole 180 may be a sound introduction 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 communication hole 160 and/or the sound leakage hole 180 may be an unshielded through hole, so as to ensure the effect of absorbing sound leakage sound waves. In some implementations, a damping layer is provided at the upper opening of the communication hole 160 and/or the sound leakage hole 180 to adjust the phase and amplitude of the sound wave and correct the effect of the sound wave being exported.

In some embodiments, in order to achieve the sound leakage absorption effect of a specific frequency (for example, 1.5 kHz), so that the resonant cavity can absorb sound waves within the target frequency range, according to the formula (1) and in combination with the actual size of the vibrating cavity 140 and the resonant cavity , the area of a communication hole 160 or a plurality of communication holes (such as a plurality of communication holes 160, a plurality of first communication holes 231, a plurality of second communication holes 241, or the first communication hole 231 and the second communication hole 241 ) can be set to not less than 0.05 mm ² , so that within the widest possible range of connecting hole area values, the resonant cavity covers the possible frequency range of leakage sound when absorbing sound waves, improving the efficiency of sound leakage reduction. In some embodiments, the volume of one resonant cavity 150 or the total volume of multiple resonant cavities (for example, the third resonant cavity 310, the fourth resonant cavity 320, and the fifth resonant cavity 340) may be set to be no greater than 6500 mm ³ , This enables the resonant cavity to cover the possible frequency range of leakage sound when absorbing sound waves within the widest possible value range of the volume of the resonant cavity, thereby improving the efficiency of reducing sound leakage. In some embodiments, the volume of one resonant cavity 150 or the total volume of multiple resonant cavities (for example, the third resonant cavity 310, the fourth resonant cavity 320, and the fifth resonant cavity 340) may be set to be no greater than 2100 mm ³ , This enables the resonant cavity to cover a wide frequency range of leakage sound when absorbing sound waves within a wide value range of the volume of the resonant cavity, thereby improving the efficiency of reducing sound leakage.

In some embodiments, the diameter of a communication hole 160 or a plurality of communication holes (such as a plurality of communication holes 160, a plurality of first communication holes 231, a plurality of second communication holes 241, or the first communication hole 231 and The total diameter of the second communication hole 241) can be set to 0.1 mm to 10 mm, the volume of one resonant cavity 150 or multiple resonant cavities (for example, the third resonant cavity 310, the fourth resonant cavity 320 and the fifth resonant cavity 340) The total volume of the resonator can be set from 65 mm ³ to 6500 mm ³ , so that the resonant cavity can cover a wide frequency range of leakage sound when absorbing sound waves, and improve the efficiency of reducing sound leakage. In some embodiments, according to the selection of the target frequency range, the diameter of at least one communication hole 160 or a plurality of communication holes (such as a plurality of communication holes 160, a plurality of first communication holes 231, a plurality of second communication holes 241, Or the total diameter of the first communication hole 231 and the second communication hole 241) can be set to 0.2 mm to 5 mm, the volume of one resonant cavity 150 or multiple resonant cavities (for example, the third resonant cavity 310, the fourth resonant cavity 320 and the fifth resonant cavity 340) can be set to a total volume of 80 mm ³ to 3000 mm ³ . In some embodiments, in order to simultaneously ensure that the size of the communication hole and the resonant cavity can be within an appropriate size range, the diameter of at least one communication hole 160 or the diameter of a plurality of communication holes (such as a plurality of communication holes 160, a plurality of first connections The total diameter of the through hole 231, a plurality of second communication holes 241, or the first communication hole 231 and the second communication hole 241) can be set to 0.5 mm to 3 mm, and the volume of one resonant cavity 150 or multiple resonant cavities ( For example, the total volume of the third resonant cavity 310 , the fourth resonant cavity 320 and the fifth resonant cavity 340 ) may be set to 100 mm ³ to 1000 mm ³ .

In some embodiments, the vibrating structure 120 can be set in various ways to achieve different sound leakage reduction requirements, such as the changing setting of the distance between the vibrating structure 120 and the housing 130, and for example, the structural shape or size of the vibrating structure 120 The area transformation setting, etc., can refer to the corresponding content description in Figure 14 for the specific setting method, and will not be repeated here.

The sound leakage reducing device provided by the embodiment of the present invention is further described below by way of some examples.

Fig. 2 to Fig. 4 are structural schematic diagrams of sound leakage reducing devices according to some embodiments of the present invention.

Embodiment one

As shown in Figure 2, a vibrating cavity 140 and a resonant cavity 150 are provided in the housing 130 of the sound leakage reducing device 200, and a communication hole 160 is provided on the side wall 170 between the vibrating cavity 140 and the resonant cavity 150 to realize The two are connected by air conduction, and a sound leakage hole 180 is also provided on the outer wall of the casing 130 . In some embodiments, according to 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, the outer wall 131 , the outer wall 132 or the outer wall 133 . In some embodiments, according to the selection of the corresponding target frequency range, the sound leakage hole 180 may be located at any position on any outer wall of the casing, such as a middle position or an edge position of the outer wall. In some embodiments, when the sound leakage hole 180 is provided on the outer wall of the resonance cavity 150 opposite to the side wall 170 (that is, the outer wall 131 shown in FIG. 2 ), according to the selection of the corresponding target frequency range, the sound leakage hole 180 communicates with the The holes 160 can be arranged in a staggered manner as shown in FIG. 2 , and the sound leakage holes 180 and the communication holes 160 can also be arranged opposite to each other (that is, they are not arranged in a staggered manner). In some embodiments, in order to meet the corresponding target frequency range, different transformation settings can be performed on the size of the communication hole 160, the size of the sound leakage hole 180, or the proportional relationship between the two. It can be set that the diameter of the sound leakage hole 180 is larger than that of the communication hole 180 The diameter of the hole 160, for example, the diameter ratio of the sound leakage hole 180 to the communication hole 160 is set to 3:2, so that on the basis of the resonant cavity 150 absorbing a specific frequency sound wave through the communication hole 160, it is more effective to guide a part of the expected sound wave to the outside of the housing 130.

Embodiment two

As shown in Figure 3, a vibrating cavity 140 and a resonant cavity 150 are provided in the housing 130 of the sound leakage reducing device 300, and a communication hole 160 is provided on the side wall 170 between the vibrating cavity 140 and the resonant cavity 150 to realize The two are connected by air conduction, and two sound leakage holes 180 and 181 are provided on the outer wall of the casing 130 . As for the specific positions of the sound leakage hole 180 and the sound leakage hole 181 , they are similar to the sound leakage hole 180 described in the first embodiment. For details, please refer to the relevant description of the first embodiment above, and will not repeat them here. In some embodiments, in order to meet the corresponding target frequency range, the size of the communication hole 160, the size of the sound leakage hole 180, the size of the sound leakage hole 181 or the size ratio of the three can be set differently. For example, the sound leakage can be set. The size of the hole 180 and the size of the sound leakage hole 181 are the same as the size of the single sound leakage hole 180 in Embodiment 1 to realize the absorption of sound waves of the same target frequency or of sound waves of different target frequencies.

Embodiment three

As shown in Figure 4, a vibrating cavity 140 and a resonant cavity 150 are provided in the housing 130 of the sound leakage reducing device 400, and a communication hole 160 is provided on the side wall 170 between the vibrating cavity 140 and the resonant cavity 150 to realize The two are connected by air conduction, and three sound leakage holes 180 , 181 , 182 are provided on the outer wall of the casing 130 . As for the respective specific positions of the sound leakage hole 180, the sound leakage hole 181, and the sound leakage hole 182, they are similar to the sound leakage hole 180 described in Embodiment 1. For details, please refer to the relevant description of the aforementioned Embodiment 1, and will not repeat them here. . In some embodiments, in order to meet the corresponding target frequency range, different transformation settings can be performed on the size of the communication hole 160, the size of the sound leakage hole 180, the size of the sound leakage hole 181, the size of the sound leakage hole 182, or the four. For example, the size of the sound leakage hole 180 and the size of the sound leakage hole 181 can be set, and the size of the single sound leakage hole 180 of the embodiment one or the size of the sound leakage hole 180 and the size of the sound leakage hole 181 of the embodiment two, to achieve the same target frequency range Equivalent settings or differential settings for different target frequency ranges.

Fig. 5 is a graph of sound leakage curves of the sound leakage reducing device according to some embodiments of the present invention. Wherein, the abscissa indicates the leakage frequency, and the unit is Hz; the vertical axis indicates the sound pressure level of the leakage, and the unit is dB. Exemplarily, the test condition may be that the earphone core sample is in a suspended state and the sound-receiving microphone is placed behind the ear, and the measurement position is 35 mm from the front panel of the vibrating structure when suspended in the air. It should be noted that FIG. 5 and all the leakage curves and test conditions mentioned in the present invention are only for illustrative purposes and should not be construed as limiting the present invention.

As shown in FIG. 5 , for the leakage sound reduction device 100 shown in FIG. 1 , according to the leakage sound reduction curve 511 obtained after the test, it can be seen that in a specific frequency range (such as 2 kHz to 2.5 kHz, 5 kHz to 6 kHz) formed a The trough region indicates that there is a better leakage reduction effect in the specific frequency range; the leakage reduction device 200 as shown in Figure 2, according to the leakage reduction curve 512 obtained by the test, it can be known that in a specific frequency range (such as 2.5 kHz to 3.5 kHz) formed a trough area, indicating that it has a better sound leakage reduction effect in this specific frequency range; the sound leakage reduction device 300 shown in Figure 3, according to the leakage sound reduction curve 513 obtained from the test, it can be seen that in a specific frequency range The frequency range (such as 3.5 kHz to 4.5 kHz) forms a trough region, indicating that there is a better sound leakage reduction effect in this specific frequency range; the sound leakage reduction device 400 shown in Figure 4, according to the sound leakage reduction obtained from the test From the curve 514 , it can be seen that a trough region is formed in a specific frequency range (5.5 kHz to 6 kHz), indicating that there is a better leakage reduction effect in the specific frequency range.

From this it can be concluded that the sound leakage reduction devices shown in Figures 2 to 4 have achieved the sound leakage reduction effect in a specific frequency range; The specific frequency range of the sound wave absorption is also different according to the different corresponding structural settings; in addition, the following conclusions can be drawn as an example according to the structural transformation settings shown in Figures 2 to 4: in a specific frequency band (such as 2 kHz to 6 kHz), other structural settings remain unchanged, the more sound leakage holes are provided on the outer wall of the housing 130, the higher the target frequency for reducing leakage sound is achieved.

In other embodiments, it is also possible to change the structural parameters of the vibrating cavity and/or resonant cavity (cavity structure shape, cavity size, volume ratio between cavities, specific position of the cavity, positional relationship between the cavities, etc.) and /or connecting hole and/or sound leakage hole structural parameters (hole shape, hole number, hole size, etc.) are set differently for sound leakage reduction, so that sound leakage reduction devices under different structural parameter settings can achieve different frequency ranges Sound leakage reduction effect, or enhance the sound leakage reduction effect in the same frequency range, for example, by increasing the size of one communication hole on the side wall, instead of setting two or more communication holes of smaller size, and vice versa.

Fig. 6 is a graph of sound leakage curves of the sound leakage reducing device according to some embodiments of the present invention. As shown in FIG. 6 , according to the leakage sound reduction curve obtained by testing, the example structure 61 of the leakage sound reduction device, and its corresponding leakage sound reduction curve 611 shows that it forms a trough region at 5.5 kHz to 6.5 kHz, indicating that at this time The resonant cavity can absorb sound waves in this frequency range, and achieve the corresponding sound leakage reduction effect; the example structure 62 of the sound leakage reduction device, and its corresponding leakage sound reduction curve 621 shows that it forms a trough region at 5 kHz to 6 kHz , indicating that the resonant cavity at this time can absorb sound waves in this frequency range, and achieve the corresponding sound leakage reduction effect; the example structure 63 of the sound leakage reduction device, and its corresponding sound leakage reduction curve 631 shows that it is between 3.7 kHz and 4.2 kHz The trough area is formed, indicating that the resonant cavity at this time can absorb sound waves in this frequency range and achieve the corresponding sound leakage reduction effect. It can be seen that by adjusting the specific structural parameters of the example structures 61, 62, 63 (increasing the number of sound leakage holes, changing the cavity volume or volume ratio), the sound leakage reduction effect of different specific frequency ranges can be achieved.

In other embodiments, in addition to directly increasing or decreasing the volume of the vibration cavity to change the volume ratio (the volume of the resonance cavity can also be adjusted, or the volume of the vibration cavity and the resonance cavity can be adjusted together), it can also be punched through the outer wall The equivalent volume of the vibrating cavity and the resonant cavity is set by means of the method. Exemplarily, returning to FIG. 6 , the example structure 62 of the sound leakage reducing device is compared with the example structure 63, and other structural parameters are the same, and the volume of the vibration cavity is reduced, which is the same as that achieved by the example structure 63 at 3.7 kHz to 4.2 kHz. The frequency range absorbs sound waves (thus realizing the reduction of sound leakage in this frequency range). Compared with the sound absorption frequency realized by the example structure 62, that is, the frequency band in the frequency range of 5 kHz to 6 kHz becomes higher; further, the reduction of sound leakage The example structure 61 of the device is compared with the example structure 62, and other structural parameters are the same, and a sound leakage hole is added, and the sound absorption in the frequency range of 5 kHz to 6 kHz realized by the example structure 62, the sound absorption frequency realized by the example structure 61, namely The 5.5 kHz to 6.5 kHz frequency range is also further shifted higher. It can be seen that, in a specific frequency band (such as 3.5 kHz to 6.5 kHz), the larger the volume of the vibration cavity, the higher the frequency range to achieve the corresponding leakage sound reduction effect.

By setting the structure of different sound leakage reduction devices, it is possible to achieve the sound leakage reduction requirements of various frequency ranges. For example, in the structural setting of a specific speaker or earphone, it is hoped that the general human ear is more sensitive to the sound frequency range (such as less than 5 kHz) ) to obtain a better sound leakage reduction effect, because the frequency range (such as 2.5 kHz to 3.5 kHz) realized by the sound leakage reduction device 200 described in Embodiment 1, and the frequency range realized by the sound leakage reduction device 300 described in Embodiment 2 (such as 3.5 kHz to 4.5 kHz), all of which can meet the sensitive frequency range of the human ear, so the structural style of the sound leakage reduction device shown in Embodiment 1 and Embodiment 2 (including other feasible equivalent structures) can be selected to achieve a relatively Good leakage reduction effect.

7 to 9 are structural schematic diagrams of sound leakage reducing devices according to some embodiments of the present invention. Fig. 10 is a graph of sound leakage curves of the sound leakage reducing device according to some embodiments of the present invention.

Embodiment four

As shown in Figure 7, the sound leakage reducing device 700 is provided with a first resonant cavity 210 and a second resonant cavity 220, the first resonant cavity 210 is arranged on the first side wall 230 of the vibrating cavity 140, the first resonant cavity 210 and the vibrating cavity 140 is in air conduction communication through the first communication hole 231 on the first side wall 230 , and the second resonant cavity 220 is in air conduction communication with the first resonant cavity 210 through the second communication hole 241 on the second side wall 240 .

In some embodiments, in order to obtain the frequency band of the specific frequency range where the leakage sound is expected to be reduced, the respective volumes or volume ratios of the two resonant cavities, the volume ratio of the total volume of the two resonant cavities to the vibrating cavity, the number of communicating holes, and a single resonance can be selected. Structural parameters such as the diameter or total diameter of the cavity, the pipe length of a single communication hole or the total effective length of the pipe, and the ratio of various size parameters between the communication holes are set accordingly. Exemplarily, by increasing the volume ratio of one of the resonant cavities or the total volume of the two resonant cavities to the volume of the vibrating cavity, the frequency band in which the specific frequency range of leakage sound can be reduced can be realized. In addition, in other embodiments, any possible transformation setting structure may be specifically adopted, which will not be listed here.

Embodiment five

As shown in FIG. 8 , the sound leakage reducing device 800 is provided with a first resonant cavity 210 and a second resonant cavity 220, both of the first resonant cavity 210 and the second resonant cavity 220 are arranged on the first side wall 230 of the vibrating cavity 140, and the second resonant cavity A resonant cavity 210 communicates with the vibrating cavity 140 through the first communication hole 231 on the first side wall 230 by air conduction, and the second resonant cavity 220 communicates with the vibrating cavity 140 through the third communication hole 232 on the first side wall 230 connected.

In some embodiments, in order to obtain the frequency band of the specific frequency range where the leakage sound is expected to be reduced, the respective volumes or volume ratios of the two resonant cavities, the volume ratio of the total volume of the two resonant cavities to the volume of the vibrating cavity, the number, diameter or total Corresponding transformation settings are made on structural parameters such as the diameter, the length of the connecting hole pipe or the total effective length of the pipe, and the ratio of various size parameters between the connecting holes. Exemplarily, the reduction of sound leakage in a specific frequency band can be achieved by reducing the volume of a certain resonant cavity or the ratio of the total volume of two resonant cavities to the volume of the vibrating cavity. In addition, in other embodiments, any possible transformation setting structure may be specifically adopted, which will not be listed here.

Embodiment six

As shown in Figure 9, the sound leakage reducing device 900 is provided with a third resonant cavity 310 and a fourth resonant cavity 320, the third resonant cavity 310 is arranged on the first side wall 230 of the vibrating cavity 140, the third resonant cavity 310 and the vibrating cavity 140 communicates with air conduction through the first communication hole 231 on the first side wall 230, the fourth resonant cavity 320 is arranged on the third side wall 330 of the vibrating cavity 140, and the fourth resonant cavity 320 and the vibrating cavity 140 pass through the third side wall 330 The fourth communication hole 331 is in air conduction communication.

As shown in Figure 10, the leakage reduction curve 1011 is obtained by testing the initial structure with only a vibrating cavity and no resonant cavity, and the leakage reduction curve 1012 is obtained by testing the leakage reduction device shown in Figure 9 . According to the comparison of the leakage sound reduction curves 1012 and 1011 obtained by the test, it can be seen that the two resonant cavities of the sound leakage reduction device 900 are arranged in parallel on different side walls of the vibration cavity. , 4.5 kHz to 5 kHz) form a trough area, wherein the trough area of leakage sound in a specific frequency range (such as 1.9 kHz to 2.4 kHz) is generated by the setting of the fourth resonant cavity 320, in a specific frequency range ( Such as 2.7 kHz to 3.5 kHz), the sound leakage area is generated by the setting of the third resonant cavity 310. In a specific frequency range (such as 4.5 kHz to 5 kHz), due to the vibration cavity 140 With the addition of the first communication hole 231 on the first side wall 230, the depth of the trough area of the vibration cavity 140 and the specific frequency range have changed compared with those before the communication hole is not provided, indicating that in multiple Significant sound leakage reduction effect has been achieved in a specific frequency range.

In some other embodiments, according to the sound leakage reduction effect shown in FIG. 10 , it can be known that the individual or overall structure Combined settings to achieve the corresponding frequency range of leakage reduction. For example, in order to focus on a specific frequency range (such as 1.5 kHz to 3 kHz) to enhance its sound leakage reduction effect, the vibration cavity and/or the resonant cavity can be configured by corresponding structural settings of the volume size or the size of the communication hole, so that the vibration cavity and/or the trough areas of the resonant cavities fall in the frequency band of the smaller specific frequency range, that is, the frequency difference between the vibrating cavities and/or the resonating cavities is in a small difference range, for example, The differences are all distributed in the interval from 0.1 kHz to 0.3 kHz; for another example, in order to obtain a wider specific frequency range (such as 1 kHz to 5 kHz), it is possible to adjust the volume size or the size of the communication hole of the vibrating cavity and/or resonant cavity Corresponding structural settings, so that the vibration cavity and/or the resonant cavity's leakage-reducing sound trough area is relatively scattered or evenly falls in the frequency band of this wider frequency range, for example, the frequency range of the trough area generated by the fourth resonant cavity 320 is located at 1 kHz From 2.5 kHz to 2.5 kHz, the frequency range of the trough area generated by the third resonant cavity 310 is in the 2.5 kHz to 4 kHz frequency range, and the frequency range of the wave trough area generated by the vibrating cavity 140 is in the 4 kHz to 5 kHz frequency range.

In some other embodiments, if it is desired to increase or decrease the frequency band of the specific frequency range of leakage reduction, the positions of the two resonant cavities on different side walls can be changed, the respective volumes or volume ratios of the two resonant cavities, the total volume of the two resonant cavities The volume ratio of the vibration chamber, the number of communication holes, the diameter or the total equivalent diameter, the length of the communication hole pipeline or the total effective length of the pipeline, and the ratio of various dimensional parameters between the communication holes and other structural parameters are set accordingly. Exemplarily, by increasing the volume of the resonant cavity (the fourth resonant cavity 320 shown in FIG. 9 ) disposed on the side wall close to the vibration panel 121 of the sound leakage reducing device, the frequency range of the frequency range of the leakage reducing sound can be reduced. In addition, in some other embodiments, specifically, any possible transformation setting structure may be adopted, which will not be listed here.

In some other embodiments, it is also possible to change the structural parameters of the vibrating cavity and/or resonating cavity (the number of cavities, the structural shape of the cavity, the size of the cavity, the volume ratio between the vibrating cavity and the resonating cavity, the specific position of the cavity, The positional relationship between the cavities, etc.) and/or the structural parameters of the connecting holes and/or sound leakage holes (hole shape, number of holes, size of holes, etc.) to adjust the sound leakage reduction effect.

Through the different structural transformation settings of the leakage reduction device, it further provides an implementable solution that can meet the leakage reduction requirements in various frequency ranges, and the corresponding equivalent or transformation structure can be carried out according to the more detailed specific leakage reduction requirements. settings, to a greater extent optimized the leakage reduction performance to meet the diverse needs of users.

Fig. 11 is a schematic structural diagram of a sound leakage reducing device according to some embodiments of the present invention. Fig. 12 is a graph of sound leakage curves of the sound leakage reducing device according to some embodiments of the present invention.

Embodiment seven

As shown in Figure 11, the sound leakage reducing device 1100 is provided with a third resonant cavity 310, a fourth resonant cavity 320, and a fifth resonant cavity 340, the third resonant cavity 310 is arranged on the first side wall 230 of the vibrating cavity 140, the third resonant cavity The resonant cavity 310 communicates with the vibrating cavity 140 through the first communication hole 231 on the first side wall 230, the fourth resonant cavity 320 is arranged on the third side wall 330 of the vibrating cavity 140, the fourth resonant cavity 320 and the vibrating cavity 140 Through the fourth communication hole 331 on the third side wall 330, the fifth resonance cavity 340 is arranged on the fourth side wall 350 of the vibration cavity 140, and the fifth resonance cavity 340 and the vibration cavity 140 pass through the fifth hole on the fourth side wall 350. The communication hole 351 communicates with air conduction. As shown in Figure 12, the sound leakage reduction curve 1201 is obtained by testing the initial structure with only a vibrating cavity and no resonant cavity, and the sound leakage reduction curve 1202 is obtained by testing the sound leakage reduction device shown in Figure 9 . According to the sound leakage test effect shown in Figure 12, it can be seen that according to the leakage reduction curves 1201 and 1202 obtained by the test, it can be seen that in multiple specific frequency ranges (such as 1.4 kHz to 1.6 kHz, 2.3 kHz to 2.7 kHz, 3.4 kHz to 3.8 kHz, 4.3 kHz to 4.7 kHz) to generate a plurality of trough regions, wherein the leakage-reducing sound trough region in a specific frequency range (such as 1.4 kHz to 1.6 kHz) is generated by the setting of the third resonant cavity 310, The sound leakage trough area in a specific frequency range (such as 2.3 kHz to 2.7 kHz) is generated by the setting of the fourth resonant cavity 320, and the sound leakage trough area in a specific frequency range (such as 3.4 kHz to 3.8 kHz) is Produced by the setting of the fifth resonant cavity 340, due to the addition of the first communicating hole 231 on the first side wall 230 between the vibrating cavity 140 and the third resonating cavity 310, the trough area of the vibrating cavity 140 is not provided with the communicating hole. Compared with before, the depth of the sound leakage reduction trough area and the specific frequency range have changed, indicating that a significant leakage reduction effect has been achieved in multiple specific frequency ranges, which is different from the leakage reduction device 900 described in the fifth embodiment. Compared with that in a specific frequency band (such as the frequency range of 1 kHz to 5 kHz), it has the characteristics of a lower frequency band trend in the frequency range of leakage reduction, a more comprehensive distribution of frequency bands, and a more significant effect of leakage reduction in low frequency bands.

In some other embodiments, according to the sound leakage reduction effect shown in FIG. 340) Each or the overall structure combination is set to realize the corresponding frequency range of leakage reduction. For example, in order to focus on a specific frequency range (such as 1 kHz to 3 kHz) to enhance its sound leakage reduction effect, the vibration cavity and/or the resonant cavity can be configured according to the volume size or the size of the communication hole, so that the vibration cavity and/or the trough areas of the resonant cavities fall in the frequency band of the smaller specific frequency range, that is, the frequency difference between the vibrating cavities and/or the resonating cavities is in a small difference range, for example, The difference values are all distributed in the interval from 0 kHz to 0.2 kHz; for another example, in order to obtain a wider specific frequency range (such as 1 kHz to 6 kHz), it is possible to adjust the volume size or the size of the communication hole of the vibration cavity and/or resonant cavity Corresponding structural settings, so that the vibration cavity and/or the resonant cavity's leakage-reducing sound trough area is relatively dispersed or evenly falls in the frequency band of this wider frequency range, for example, the frequency range of the trough area generated by the third resonant cavity 310 is located at 1 kHz to 2 kHz frequency band, the frequency range of the trough area generated by the fourth resonant cavity 320 is located in the 2 kHz to 3.5 kHz frequency band, the frequency range of the wave trough area generated by the fifth resonant cavity 340 is located in the frequency range of 3.5 kHz to 5 kHz, and the frequency range of the wave trough area generated by the vibration cavity 140 is located in the frequency range of 3.5 kHz to 5 kHz. The frequency range of the trough area is located in the 5 kHz to 6 kHz frequency band.

In other embodiments, if it is desired to increase or decrease the frequency band of a specific frequency range for reducing sound leakage, the position of the three resonant cavities on different side walls can be changed, the respective volumes or volume ratios of the three resonant cavities, the total volume of the two resonant cavities or the volume ratio of the equivalent volume to the vibrating cavity, the number of communicating holes, the diameter or the total equivalent diameter, the length of the connecting hole pipeline or the total effective length of the pipeline, and the ratio of various size parameters between the communicating holes and other structural parameters. Transform settings. Exemplarily, as shown in FIG. 11, when the volume of the fourth resonant cavity 320 is larger than that of the fifth resonant cavity 340, other structural parameters remain unchanged, and by increasing the volume of the vibrating cavity, the trough of the leakage frequency range is reflected The frequency band is going to the low frequency band. In addition, in some other embodiments, specifically, any possible transformation setting structure may be adopted, which will not be listed here.

In some other embodiments, it is also possible to change the structural parameters of the vibrating cavity and/or resonating cavity (the number of cavities, the structural shape of the cavity, the size of the cavity, the volume ratio between the vibrating cavity and the resonating cavity, the specific position of the cavity, The positional relationship between the cavities, etc.) and/or the structural parameters of the connecting holes and/or sound leakage holes (hole shape, number of holes, size of holes, etc.) to adjust the sound leakage reduction effect.

Fig. 13 is a sound leakage curve diagram of a sound leakage reducing device shown according to some embodiments of the present invention, showing a variety of conversion structure settings with resonant cavities, specifically including an example structure of one cavity in series (as shown in Figure 1, series Two cavities are paralleled (as shown in Figure 9) and three cavities are connected in series (as shown in Figure 11). By comparing the sound leakage reduction effect with the structure without a resonant cavity, the addition of a resonant cavity, whether it is a series cavity structure or a series structure Whether it is a parallel two-cavity structure or a series-parallel three-cavity structure, the trough areas formed are all distributed in the frequency range between 1.5 kHz and 5 kHz. Compared with the structure without a resonant cavity, the sound leakage reduces the sound pressure level by more than 25 dB. At most, it can reach 30 dB, and each corresponding structural setting with a resonant cavity can realize the corresponding frequency range of leakage sound reduction as required, so as to meet the sound leakage reduction requirements of various working scenarios.

In some embodiments, the resonant cavities described in the embodiments of the present invention (such as the resonant cavity 150 in FIGS. 1 to 4, the first resonant cavity 210 in FIGS. The resonant cavity 310 , the fourth resonant cavity 320 , the fifth resonant cavity 340 , etc.) may be a cavity structure disposed inside the vibrating cavity 140 and formed by at least one baffle and the inner wall of the housing 130 . In some embodiments, the aforementioned resonant cavity may be a cavity structure formed by one (or one) baffle and three inner walls of the casing 130 . In some embodiments, the aforementioned resonant cavity may be a cavity structure formed by two (or two) baffles and inner walls on both sides of the casing 130 . In some embodiments, the aforementioned resonant cavity may be a cavity structure formed by an integrally formed baffle and an inner wall of one side of the housing 130 , for example, the integrally formed baffle may be a hollow cuboid, a hollow cube, or the like. In some embodiments, the aforementioned resonant cavity may be a non-closed cavity with an opening.

Fig. 14 is a schematic structural diagram of a sound leakage reducing device according to some embodiments of the present invention. In some embodiments, the resonant cavities described in the embodiments of the present invention (such as the resonant cavity 150 in FIGS. 1 to 4, the first resonant cavity 210 in FIGS. resonant cavity 310 , fourth resonant cavity 320 , and fifth resonant cavity 340 ), the structural transformation of the resonant cavity as shown in FIG. 14 can be performed. In the sound leakage reducing device 1400, one or more resonant cavities (such as resonant cavities 191, 192, 196) can be constructed by a plurality of baffles 190 arranged on the inner wall of the vibrating cavity 140 (or the inner wall of the housing 130) Or a non-closed cavity formed by the column structure and the inner wall of the vibration cavity 140 (such as the resonance cavity 191 ). According to the requirement of sound leakage reduction at a specific frequency, the number, height h, and width s of the resonant cavity of the baffles 190 can be selected within a corresponding range of values. In some embodiments, the height h of the baffle 190 and the width s of the resonant cavity of different resonant cavities (such as resonant cavities 191 , 192 , 196 ) may be the same or different. In some embodiments, the specific frequency of leak reduction achieved by different resonant cavities (such as resonant cavities 191 , 192 , 196 ) may be the same or different. In some embodiments, the baffle 190 may be disposed on any inner wall of the vibration chamber 140 (or any inner wall of the casing 130 ), such as other inner walls of the vibration chamber 140 not shown in FIG. 14 . It should be noted that the deformed structure of the resonant cavity here is only exemplary. Within the scope of the present invention, other transformation or deformed structures that can achieve the effect of reducing sound leakage at a specific frequency can also be made. The embodiments of the present invention do not make special limit.

Fig. 15 is a schematic structural diagram of a sound leakage reducing device according to some embodiments of the present invention. As shown in FIG. 15 , there may be a predetermined distance d between the vibrating panel 121 and the housing 130 of the vibrating structure 120 . In some embodiments, the predetermined distance d refers to the distance between the upper surface of the vibrating panel 121 and the outer surface of the side wall 123 of the casing 130 . The size of the predetermined distance d can be adjusted by adjusting the height of the vibration conducting member 122 outside the casing 130 . The height of the vibration conducting element 122 refers to the height of the vibration conducting element 122 in the Y-axis direction, that is, the vibration direction of the transducer structure 110 . In some embodiments, the predetermined distance d between the vibrating panel 121 and the casing 130 may affect the size of the opening (or gap) between the vibrating structure 120 and the casing 130 . In some embodiments, the size of the predetermined distance d between the vibrating panel 121 and the casing 130 may be positively correlated with the size of the opening between the vibrating structure 120 and the casing 130 . Specifically, the larger the predetermined distance d between the vibrating panel 121 and the casing 130, the larger the opening size between the vibrating structure 120 and the casing 130, and the smaller the predetermined distance d between the vibrating panel 121 and the casing 130, The size of the opening between the vibration structure 120 and the housing 130 is smaller.

In some embodiments, the predetermined distance d between the vibrating panel 121 and the housing 130 can be changed, and the size of the opening between the vibrating structure 120 and the housing 130 can be adjusted to adjust the additional leakage reduction of the leakage reduction device 1500 Influence. Specifically, it can be shown that the larger the predetermined distance d between the vibrating panel 121 and the housing 130 , the larger the size of the hole between the vibrating structure 120 and the housing 130 , and the stronger the noise leakage reducing capability of the noise leakage reducing device 100 . Based on this, in order to adjust the additional sound leakage reduction effect on the sound leakage reduction device 1500 so as to improve the sound leakage reduction effect of the sound leakage reduction device 1500 to varying degrees, the predetermined distance d between the vibrating panel 121 and the housing 130 can be relatively set in a larger range. In some embodiments, according to the product requirement of qualified sound leakage, the predetermined distance d may range from 0.5 mm to 4 mm. In some embodiments, in order to obtain a more appropriate sound leakage reduction effect, the range of the predetermined distance d may be between 1 mm and 3 mm.

Fig. 16 is a graph of sound leakage curves of the sound leakage reducing device according to some embodiments of the present invention. Leakage curve 1601 represents the sound leakage curve of the sound leakage reducing device with the first predetermined distance, sound leakage curve 1602 represents the sound leakage curve of the sound leakage reducing device with the second predetermined distance, and sound leakage curve 1603 represents the sound leakage curve with the third predetermined distance The sound leakage curve of the sound leakage reduction device. Wherein, the first predetermined distance is smaller than the second predetermined distance, and the second predetermined distance is smaller than the third predetermined distance. Comparing the sound leakage curve 1601, the sound leakage curve 1602 and the sound leakage curve 1603, it can be seen that within a specific frequency range (for example, 4 kHz to 6 kHz), the sound leakage curve 1601 has the widest frequency range for reducing sound leakage, and the sound leakage curve 1602 times In other words, the sound leakage curve 1603 shows that the sound leakage reduction effect is hardly improved. It can also be understood that the sound leakage reducing effect of the sound leakage reducing devices 1500 arranged with different first pitches, second pitches, and third pitches varies from strong to weak. From the above analysis, it can be known that within a specific frequency range and within a specific distance range that meets product requirements, the larger the predetermined distance between the vibrating panel 121 and the housing 130 , the stronger the sound leakage reducing effect of the sound leakage reducing device 1500 .

Referring to FIG. 15 , in some embodiments, the area and shape of the vibrating panel 121 can affect the size of the sound leakage of the sound leakage reducing device 1500 , thereby affecting the sound leakage reducing effect of the sound leakage reducing device 1500 . Specifically, it can be expressed that the larger the area of the vibrating panel 121 is, the weaker the sound leakage reducing effect of the sound leakage reducing device is. In some embodiments, the vibrating panel 121 is in contact with a human body part (for example, the face), and sound can be transmitted to the user through the vibrating panel 121 . The larger the area of the vibrating panel 121 is, the larger the contact area between the vibrating panel 121 and the body parts of the user is, the greater the received vibration sound is, and the greater the sound leakage generated by the vibrating panel 121 is. Based on this, in order to improve the sound leakage reducing capability of the sound leakage reducing device 1500 , the area of the vibrating panel 131 may be smaller. In some embodiments, in order to meet the product requirements of a wide range of vibration panels and qualified sound leakage, the area of the vibration panel 121 may be between 9 mm 2 and 700 mm ² . In some embodiments, in order to obtain a more appropriate sound leakage reduction effect, the area of the vibrating panel 121 may be between 25 mm ² and 330 mm ² .

In some embodiments, the shape of the vibrating panel 121 may be a regular and/or irregular shape such as a circle, a rectangle, an ellipse, and a pentagon. It should be noted that the sound leakage reducing device 1500 may not include the vibration panel 121, the vibration conducting member 122 is in contact with the human body, and the vibration generated by the energy transducing structure 110 is directly transmitted to the user through the vibration conducting member 122 to reduce the vibration. The contact area between the structure 120 and the user further reduces the sound leakage of the sound leakage reducing device 1500 .

Fig. 17 is a graph of sound leakage curves of the sound leakage reducing device according to some embodiments of the present invention. Leakage curve 1701 represents the sound leakage curve of the sound leakage reducing device of the first vibration panel area; sound leakage curve 1702 represents the sound leakage curve of the sound leakage reducing device of the second vibration panel area; sound leakage curve 1703 represents the third vibration panel area The sound leakage curve of the sound leakage reducing device; the sound leakage curve 1704 represents the sound leakage curve of the sound leakage reducing device of the fourth vibrating panel area. Wherein, the area of the vibrating panel in descending order is the area of the first vibrating panel, the area of the second vibrating panel, the area of the third vibrating panel, and the area of the fourth vibrating panel. Comparing the sound leakage curve 1701, the sound leakage curve 1702, the sound leakage curve 1703, and the sound leakage curve 1704, it can be seen that within a specific frequency range (for example, 3 kHz to 5 kHz), the sound leakage reduction effect of the sound leakage curve 1701 is the worst The sound leakage curve 1702 is second, the sound leakage curve 1703 is second, and the sound leakage curve 1704 has the best sound leakage reduction effect. It can also be understood that the sound leakage reduction effect of the sound leakage reducing device 1500 is the sound leakage curve 1704 , the sound leakage curve 1703 , the sound leakage curve 1702 , and the sound leakage curve 1701 in descending order. Through the above analysis, it can be seen that within a specific frequency range and within a specific vibration panel area size range 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 parts, and the sound leakage reduction device 1500 The better the leakage reduction effect.

Fig. 18 is a schematic structural diagram of an acoustic output device according to some embodiments of the present invention. As shown in FIG. 18 , an acoustic output device 1800 may include a transducing structure 110 , a vibrating structure 120 and a casing 130 . The acoustic output device shown in FIG. 18 may include any of the aforementioned sound leakage reducing devices (such as the sound leakage reducing device 100 , the sound leakage reducing device 200 , the sound leakage reducing device 300 , etc.). One or more components in the acoustic output device 1800 may be the same or similar to one or more components in the aforementioned sound leakage reducing device, for example, the housing 130 , the vibrating cavity 140 , the resonating cavity 150 , the communication hole 160 and so on.

In some embodiments, the acoustic output device 1800 may be a speaker. In some embodiments, the speaker may be a bone conduction speaker, an air conduction speaker, or a combined bone and air conduction speaker. In other embodiments, the speaker may be any other feasible speaker, which is not specifically limited in this embodiment of the present invention.

In some embodiments, taking a bone conduction speaker as an example, the acoustic output device 1800 may be a device that converts sound signals into mechanical vibrations of different frequencies. For example, the acoustic output device 1800 may be an earphone (such as a bone conduction earphone, etc.), a hearing aid (such as a bone conduction hearing aid, etc.), and the like. 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 vibration based on the mechanical vibration of the transducer structure 110 . The other end of the vibration structure 120 is in direct or indirect contact with the user's body parts, and then the mechanical vibration is transmitted to the user's auditory center through the user's body parts (eg, skull, bone labyrinth, etc.), and the user receives bone-conducted sound waves. In some embodiments, the earphones may be headphones, earphones, behind-the-ear earphones, in-ear earphones, open earphones, split earphones, around-ear earphones, neck-hung earphones, neckband earphones Or glasses-type earphones, etc., the embodiment of the present invention does not specifically limit the specific structural style of the aforementioned earphones.

In some embodiments, the vibration structure 120 may include a vibration panel 121 and a vibration conductor 122 . The vibrating panel 121 can be located at the end of the vibrating structure 120 away from the transducing structure 110 , the vibrating conductor 122 is located at the end of the vibrating structure 120 close to the transducing structure 110 , and the vibrating panel 121 is connected to the vibrating conducting component 122 . An opening can be provided on the side wall 123 of the housing 130 , and the vibration conductor 122 passes through the opening, 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 bracket 410 .

In some embodiments, the shell bracket 410 may be a part of the shell 130 , or may be a separate component, which is directly or indirectly connected to the inside of the shell 130 . In some embodiments, the housing bracket 410 may be fixed on the inner surface of the housing 130 . In some embodiments, the housing bracket 410 can be glued to the housing 130, for example, elastically connected to the housing 130 through the elastic connector 430, or can be connected by stamping, injection molding, clamping, riveting, threading or welding. It is fixed on the housing 130, which is not particularly limited in this embodiment of the present invention.

In some embodiments, the housing bracket 410 may be provided with at least one bracket hole 411 . The bracket hole 411 can lead the vibration sound wave in the vibration chamber 140 out of the housing 130 , and interfere with the sound leakage sound wave generated by the vibration of the housing 130 to reduce the amplitude of the sound leakage sound wave, thereby reducing the sound leakage of the acoustic output device 1800 . In some embodiments, the bracket hole 411 may be in a regular and/or irregular shape such as a circle, an ellipse, and a rectangle, which is not particularly limited in this embodiment of the present invention. The number of bracket holes 411 can be adaptively adjusted according to the application scenario of the acoustic output device 1800 , which is not particularly limited in this embodiment of the present invention.

In some embodiments, the transducing structure 110 may include a magnetic circuit device 111 , a coil 112 and a vibration transmitting sheet 113 . The transducing structure 110 may be located inside the housing 130 and disposed on the housing bracket 1510 . One end of the vibration transmission piece 113 is connected to the magnetic circuit device 111 , and the other end of the vibration transmission piece 113 is connected to the housing bracket 410 , and is connected to the vibration structure 120 (eg, the vibration conductor 122 ) through the housing bracket 410 . In some embodiments, the coil 112 may be fixed on the housing support 410 and drive the vibrating structure 120 to vibrate through the housing support 410 .

In some embodiments, the magnetic circuit device 111 can be used to form a magnetic field, and the coil 112 can mechanically vibrate in the magnetic field. Specifically, the coil 112 can be fed with a signal current, and the coil 112 is placed in the magnetic field formed by the magnetic circuit device 111 , and is subjected to the action of the Ampere force in the magnetic field to receive the drive to generate mechanical vibration. The mechanical vibration of the coil 112 may be transmitted to the housing support 410 , which in turn transmits the mechanical vibration to the vibrating structure 120 . The mechanical vibration is transmitted to the user through the vibration conductor 122 and the vibration panel 121 in the vibration structure 120 .

In some embodiments, the magnetic circuit device 111 may include one or more magnetic elements (not shown in the figure), and the magnetic elements may be in any feasible structural form, such as ring magnetic elements and the like. In some embodiments, multiple magnetic elements can increase the total magnetic flux, and the interaction of different magnetic elements can suppress the leakage of magnetic induction lines, increase the magnetic induction intensity at the magnetic gap, and improve the sensitivity of speakers (such as bone conduction speakers). In some embodiments, the magnetic circuit device 111 may include a magnetically permeable element (not shown in the figure), and the magnetically permeable element may take any feasible structural form, such as a magnetically permeable plate or a magnetically permeable cover. In some embodiments, the magnetic permeable cover can close the magnetic circuit generated by the magnetic circuit device 111, so that more magnetic induction lines are concentrated in the magnetic gap in the magnetic circuit device 111, so as to suppress magnetic flux leakage and increase the magnetic field at the magnetic gap. Magnetic induction and the effect of increasing the sensitivity of speakers such as bone conduction speakers.

In some embodiments, the housing 130 of the acoustic output device 1800 may be provided with an earhook element 420 . The earhook element 420 may be used to assist a user in wearing the acoustic output device 200 . In some embodiments, the earhook element may be a connector of a headphone to a headband. Taking the acoustic output device 200 as an example of a rear-mounted bone conduction device, the end of the ear-hook element 420 can be connected to the side wall of the shell 130 of the acoustic output device 1800. When the user wears the acoustic output device 1800, the ear-hook element 420 The end of may be located near the user's auricle, so that the acoustic output device 1800 is located near the user's auricle. Further, 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 and distance of the acoustic output device 1800 relative to the user's auricle can be adjusted.

In some embodiments, the connection manner between the housing 130 of the acoustic output device 1800 and the ear hook element 420 may be a fixed connection. The fixed connection here may refer to connection methods such as bonding, riveting, and integral formation. In some embodiments, the connection manner between the acoustic output device 1800 and the ear-hook element 420 may also be a detachable connection. The detachable connection here may refer to connection methods such as buckle connection and screw connection.

In some embodiments, the structural shape of the ear-hook element 420 can be any shape suitable for the auricle, such as arc, semicircle, or broken line, and the structural shape of the ear-hook element 420 can be adapted according to the user's needs. adjustment, the embodiments of the present invention are not particularly limited.

In some embodiments, the vibrating structure 120 and the housing 130 may be elastically connected, that is, fixedly connected in an elastically connected manner. For example, in some embodiments, acoustic output device 1800 may include elastic connector 430 . The elastic connecting member 430 may be located in the vibrating chamber 140 for connecting the vibrating structure 120 and the casing 130 . Specifically, one end of the elastic connecting member 430 may be connected to the vibration conducting member 122 of the vibrating structure 120 , and the other end of the elastic connecting member 430 may be connected to the inner wall of the casing 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, so that The housing 130 generates mechanical vibrations.

In some embodiments, the elastic connecting member 430 may be in the shape of a circular tube, a square tube, a special-shaped tube, a ring, a flat plate, etc., which are not particularly limited in this embodiment of the present invention. In some embodiments, the elastic connector 430 may be an elastic element. The material of the elastic element may be a material capable of elastic deformation, such as silicon rubber, metal, rubber, etc., which is not particularly limited in the embodiment of the present invention. In the embodiment of the present invention, the elastic element is more likely to be elastically deformed than the casing 130 , so that the casing 130 can move relative to the transducer structure 110 .

The basic concept has been described above, and obviously, for those skilled in the art, the above detailed disclosure is only an example, and does not constitute a limitation to the present invention. Although not explicitly described herein, various modifications, improvements and amendments to the present invention may be made by those skilled in the art. Such modifications, improvements and corrections are suggested in the present invention, so such modifications, improvements and corrections still belong to the spirit and scope of the exemplary embodiments of the present invention. Meanwhile, the present invention uses specific words to describe the embodiments of the present invention. For example, "one embodiment", "an embodiment", and/or "some embodiments" means a certain feature, structure or characteristic related to at least one embodiment of the present invention. Therefore, it should be emphasized and noted that two or more references to "an embodiment" or "an embodiment" or "an alternative embodiment" in different places in the present invention do not necessarily refer to the same embodiment . In addition, certain features, structures or characteristics of one or more embodiments of the present invention may be properly combined.

In addition, unless clearly stated in the scope of the patent application, the order of processing elements and sequences, the use of numbers and letters, or the use of other names in the present invention are not used to limit the order of the flow and methods of the present invention. While the above disclosure discusses by way of example some embodiments of the invention that are presently believed to be useful, it should be understood that such details are for illustrative purposes only and that the appended claims are not limited to the disclosed embodiments, but rather, The scope of the patent application is intended to cover all modifications and equivalent combinations that conform to the spirit and scope of the embodiments of the present invention. For example, although the above-described system components can be implemented by hardware devices, they can also be implemented by only software solutions, such as installing the described system on an existing server or mobile device.

In the same way, it should be noted that in order to simplify the expression of the disclosure of the present invention so as to help the understanding of one or more embodiments of the invention, in the foregoing description of the embodiments of the present invention, sometimes multiple features are combined into one embodiment, drawings or descriptions thereof. However, this disclosure does not imply that the object of the invention requires more features than those mentioned in the claims. Indeed, embodiment features are less than all features of a single foregoing disclosed embodiment.

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 the embodiments use the modifiers "about", "approximately" or "substantially" in some examples. grooming. Unless otherwise stated, "about", "approximately" or "substantially" indicates that the stated figure allows for a variation of ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximations that may vary depending upon the desired characteristics of individual embodiments. In some embodiments, numerical parameters should take into account the specified number of significant digits and adopt the general digit reservation method. Although the numerical ranges and parameters used to demonstrate the breadth of scope in some embodiments of the invention are approximations, in specific embodiments such numerical values are set as precisely as practicable.

Finally, it should be understood that the embodiments described in the present invention are only used to illustrate the principles of the embodiments of the present invention. Other modifications are also possible within the scope of the present invention. Accordingly, by way of illustration and not limitation, alternative configurations of the embodiments of the present invention may be considered consistent with the teachings of the present invention. Accordingly, the embodiments of the present invention are not limited to the embodiments of the present invention explicitly shown and described.

61:Example structure 62:Example structure 63:Example structure 100: Noise reduction device 110: Energy conversion structure 111:Magnetic circuit device 112: Coil 113: Vibration plate 120: Vibration structure 121: Vibration panel 122: Vibration conduction parts 123: side wall 130: Shell 131: outer wall 132: outer wall 133: outer wall 140: vibration cavity 150: Resonant cavity 160: Connecting hole 170: side wall 180: sound leak hole 181: Sound leak hole 182: Sound leak hole 190: Baffle 191: Resonant cavity 192: Resonant cavity 196: Resonant cavity 200: Noise reduction device 210: The first resonant cavity 220: Second resonant cavity 230: first side wall 231: the first connecting hole 232: The third connecting hole 240: second side wall 241: Second connecting hole 300: Noise reduction device 310: the third resonant cavity 320: The fourth resonant cavity 330: third side wall 331: The fourth connecting hole 340: fifth resonant cavity 350: Fourth side wall 351: The fifth connecting hole 400: Noise reduction device 410: shell bracket 411: bracket hole 420: ear hook element 430: elastic connector 511: Leakage reduction curve 512: Leakage reduction curve 513: Leakage reduction curve 514: Leakage Curve 700: Noise reduction device 800: Noise reduction device 900: Noise reduction device 1011: Leakage reduction curve 1012: Leakage reduction curve 1100: Noise reduction device 1201: Leakage Curve 1202: Leakage Curve 1400: Noise reduction device 1500: Noise reduction device 1601: Leakage Curve 1602: Leakage Curve 1603: Leakage Curve 1701: Leakage Curve 1702: Leakage Curve 1703: Leakage Curve 1704: Leakage Curve 1800: Acoustic output device

The invention will be further illustrated by way of exemplary embodiments which will be described in detail by means of the accompanying drawings. These examples are non-limiting, and in these examples, the same number indicates the same structure, wherein:

[Fig. 1] is a schematic structural diagram of a sound leakage reducing device according to some embodiments of the present invention;

[Fig. 2] is a schematic structural diagram of a sound leakage reduction device according to some embodiments of the present invention;

[Fig. 3] is a schematic structural diagram of a sound leakage reduction device according to some embodiments of the present invention;

[Fig. 4] is a schematic structural diagram of a sound leakage reduction device according to some embodiments of the present invention;

[Fig. 5] is a curve diagram of sound leakage of the sound leakage reducing device according to some embodiments of the present invention;

[Fig. 6] is a curve diagram of sound leakage of the sound leakage reducing device according to some embodiments of the present invention;

[Fig. 7] is a schematic structural diagram of a sound leakage reducing device according to some embodiments of the present invention;

[Fig. 8] is a schematic structural diagram of a sound leakage reducing device according to some embodiments of the present invention;

[Fig. 9] is a schematic structural diagram of a sound leakage reducing device according to some embodiments of the present invention;

[Fig. 10] is the sound leakage curve diagram of the sound leakage reducing device according to some embodiments of the present invention;

[Fig. 11] is a schematic structural diagram of a sound leakage reducing device according to some embodiments of the present invention;

[Fig. 12] is a curve diagram of sound leakage of the sound leakage reduction device according to some embodiments of the present invention;

[Fig. 13] is the sound leakage curve diagram of the sound leakage reducing device according to some embodiments of the present invention;

[Fig. 14] is a schematic structural diagram of a sound leakage reducing device according to some embodiments of the present invention;

[Fig. 15] is a schematic structural diagram of a sound leakage reduction device according to some embodiments of the present invention;

[Fig. 16] is the sound leakage curve diagram of the sound leakage reducing device according to some embodiments of the present invention;

[Fig. 17] is the sound leakage curve diagram of the sound leakage reducing device according to some embodiments of the present invention;

[ Fig. 18 ] is a schematic structural diagram of an acoustic output device according to some embodiments of the present invention.

100: Noise reduction device

110: Energy conversion structure

120: Vibration structure

121: Vibration panel

122: Vibration conduction parts

130: Shell

140: vibration cavity

150: Resonant cavity

160: Connecting hole

170: side wall

Claims (10)

A sound leakage reducing device, which includes a transducing structure, a vibrating structure and a housing; the housing has a vibrating cavity and at least one resonant cavity; the transducing structure is located in the vibrating cavity and connected to the vibrating structure The at least one resonant cavity communicates with the vibrating cavity through at least one communication hole, and the volume of each resonant cavity in the at least one resonant cavity is smaller than the volume of the vibrating cavity. The sound leakage reducing device according to claim 1, wherein the at least one resonant cavity includes multiple resonant cavities, and the multiple resonant cavities are arranged on the same side wall or different side walls of the vibration cavity, and are connected to the vibration cavity They are in air conduction communication through the at least one communication hole. The sound leakage reducing device according to claim 2, wherein the at least one resonant cavity includes a first resonant cavity and a second resonant cavity, the first resonant cavity is arranged on the first side wall of the vibrating cavity, and the first resonant cavity A resonant cavity is in air conduction communication with the vibrating cavity through the first communication hole on the first side wall, and the first resonant cavity is connected with the second resonant cavity through the second resonant cavity of the first resonant cavity. The second communication hole on the side wall communicates with air conduction. The sound leakage reducing device according to claim 2, wherein the at least one resonant cavity includes a first resonant cavity and a second resonant cavity, and both the first resonant cavity and the second resonant cavity are arranged on the side of the vibrating cavity On the first side wall, the first resonant cavity communicates with the vibrating cavity through the first communication hole on the first side wall, and the second resonant cavity communicates with the vibrating cavity through the first The third communication hole on the side wall is in air conduction communication. The sound leakage reducing device according to claim 2, wherein the at least one resonant cavity includes a third resonant cavity and a fourth resonant cavity, the third resonant cavity is arranged on the first side wall of the vibrating cavity, and the first resonant cavity The three resonant cavities communicate with the vibrating cavity by air conduction through the first communication hole on the first side wall, the fourth resonant cavity is arranged on the third side wall of the vibrating cavity, and the fourth resonant cavity is connected with the vibrating cavity. The vibration chamber communicates with air conduction through the fourth communication hole on the third side wall. The sound leakage reducing device according to claim 1, wherein the outer wall of the vibration cavity and/or the at least one resonant cavity has a sound leakage hole. The sound leakage reducing device according to claim 1, wherein the at least one resonant cavity reduces sound leakage of a specific frequency, and the specific frequency is in the range of 20 Hz to 10000 Hz. The sound leakage reducing device according to claim 6, wherein the volume ratio between each of the at least one resonant cavity and the vibrating cavity is not less than 0.1. The sound leakage reducing device according to claim 8, wherein the volume of each of the at least one resonant cavity is not greater than 6500 mm ³ , or the area of each of the at least one communicating hole is not less than 0.05 mm ² . An acoustic output device, comprising the sound leakage reducing device according to any one of Claims 1 to 9.

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