A bone conduction speaker

Abstract

An embodiment of the present application discloses a bone conduction speaker, comprising: a vibration assembly, the vibration assembly includes a vibration element and a vibration housing, the vibration element is configured to convert an electrical signal into mechanical vibration, and the vibration housing is configured to contact with a user's face and transmit the mechanical vibration to the user in a bone conduction manner to generate sound; and a resonance assembly, the resonance assembly includes a first elastic element and a mass element, the mass element is connected to the vibration assembly through the first elastic element, wherein the vibration assembly causes the resonance assembly to vibrate, and the vibration of the resonance assembly can weaken the vibration amplitude of the vibration housing.

Description

Technical Field

[0001] The present application relates to the field of bone conduction speakers, and particularly to a bone conduction speaker capable of improving the low-frequency vibration feeling. Background Art

[0002] A bone conduction speaker can convert a sound signal into a mechanical vibration signal, and transmit the mechanical vibration signal through human tissues and bones to the auditory nerve of the human body, so that the wearer can hear the sound. After broadening the frequency response range of the bone conduction speaker, especially the low-frequency response range, due to the large amplitude of the low-frequency resonance peak of the bone conduction speaker, the vibration feeling generated by the bone conduction speaker is relatively strong, affecting the user experience, and the large peak value of the resonance peak will also reduce the sound quality.

[0003] The present application provides a bone conduction speaker, which can not only significantly reduce the vibration feeling of the bone conduction speaker at the low-frequency resonance peak, but also improve the sound quality of the bone conduction speaker. Summary of the Invention

[0004] The object of the present invention is to provide a bone conduction speaker, aiming to reduce the amplitude of the low-frequency resonance peak of the bone conduction speaker, so as to reduce the vibration feeling of the bone conduction speaker and improve the sound quality.

[0005] In order to achieve the object of the above invention, the technical solution provided by the present invention is as follows:

[0006] A bone conduction speaker, comprising: a vibration assembly, the vibration assembly includes a vibration element and a vibration housing, the vibration element is used to convert an electrical signal into a mechanical vibration, and the vibration housing is used to contact with the user's face and transmit the mechanical vibration to the user in a bone conduction manner to generate sound; and a resonance assembly, the resonance assembly includes a first elastic element and a mass element, the mass element is connected to the vibration assembly through the first elastic element, wherein the vibration assembly causes the resonance assembly to vibrate, and the vibration of the resonance assembly weakens the vibration amplitude of the vibration housing.

[0007] In some embodiments, the ratio of the mass of the mass element to the mass of the vibration housing is in the range of 0.04 to 1.25.

[0008] In some embodiments, the ratio of the mass of the mass element to the mass of the vibration housing is in the range of 0.1 to 0.6.

[0009] In some embodiments, the vibration assembly generates a first low-frequency resonance peak at a first frequency, and the resonance assembly generates a second low-frequency resonance peak at a second frequency, and the ratio of the second frequency to the first frequency is in the range of 0.5 to 2.

[0010] In some embodiments, the vibration assembly generates a first low-frequency resonance peak at a first frequency, and the resonance assembly generates a second low-frequency resonance peak at a second frequency, and the ratio of the second frequency to the first frequency is in the range of 0.9 to 1.1.

[0011] In some embodiments, both the first frequency and the second frequency are less than 500 Hz.

[0012] In some embodiments, in a frequency range less than the first frequency, the vibration amplitude of the resonance assembly is greater than the vibration amplitude of the vibration housing.

[0013] In some embodiments, the vibration assembly further includes a second elastic element, wherein the vibration housing houses the vibration element and the second elastic element, and the vibration element transmits the mechanical vibration to the vibration housing through the second elastic element.

[0014] In some embodiments, the second elastic element is a vibration transmission sheet, and the vibration transmission sheet is fixedly connected to the vibration housing.

[0015] In some embodiments, the first elastic element is fixedly connected to the vibration housing, and the vibration housing transmits the mechanical vibration to the mass element through the first elastic element.

[0016] In some embodiments, the resonance assembly is housed in the vibration housing, and the resonance assembly is connected to the inner wall of the vibration housing through the first elastic element.

[0017] In some embodiments, the first elastic element includes a diaphragm, and the mass element includes a composite structure attached to the surface of the diaphragm.

[0018] In some embodiments, the composite structure includes a paper cone, an aluminum sheet, or a copper sheet.

[0019] In some embodiments, at least one sound outlet hole is formed in the vibration housing, and the sound generated by the vibration of the resonance assembly is led out to the outside through the at least one sound outlet hole.

[0020] In some embodiments, the at least one sound outlet hole is formed on a side of the vibration housing facing away from the user's face.

[0021] In some embodiments, the bone conduction speaker further includes a fixing assembly for maintaining stable contact between the bone conduction speaker and the user, and the fixing assembly is fixedly connected to the vibration housing.

[0022] In some embodiments, the resonance assembly is located outside the vibration housing, and the resonance assembly is connected to the outer wall of the vibration housing through the first elastic element.

[0023] In some embodiments, the mass element is a groove member, at least part of the vibration housing is received in the groove member, the first elastic element connects the outer wall of the vibration housing and the inner wall of the groove member, and a sound outlet channel is formed between the inner wall of the groove member and the outer wall of the vibration housing.

[0024] In some embodiments, the bone conduction speaker further includes a fixing assembly for maintaining contact between the bone conduction speaker and the user's face, and the fixing assembly is fixedly connected to the resonance assembly. Description of the Drawings

[0025] This application will be further described by way of exemplary embodiments, which will be described in detail through the drawings. These embodiments are not restrictive. In these embodiments, the same numbers represent similar structures, where:

[0026] Figure 1 is a structural block diagram of a bone conduction speaker according to some embodiments of the present application;

[0027] Figure 2 is a longitudinal sectional view of a bone conduction speaker without a resonance assembly added according to some embodiments of the present application;

[0028] Figure 3 is a partial frequency response curve of a bone conduction speaker without a resonance assembly added according to some embodiments of the present application;

[0029] Figure 4 is a longitudinal sectional view of a bone conduction speaker with a resonance assembly added according to some embodiments of the present application;

[0030] Figure 5 is a partial frequency response curve of a bone conduction speaker with a resonance assembly added according to some embodiments of the present application;

[0031] Figure 6 is a longitudinal sectional view of another bone conduction speaker according to some embodiments of the present application;

[0032] Figure 7 is a longitudinal sectional view of yet another bone conduction speaker according to some embodiments of the present application;

[0033] Figure 8 is a longitudinal sectional view of yet another bone conduction speaker according to some embodiments of the present application;

[0034] Figure 9 is a longitudinal sectional view of yet another bone conduction speaker according to some embodiments of the present application;

[0035] Figure 10 It is a schematic diagram of a simplified mechanical model of a bone conduction speaker without adding a resonance component as shown in some embodiments of the present application;

[0036] Figure 11 It is a schematic diagram of a simplified mechanical model of a bone conduction speaker with a resonance component added as shown in some embodiments of the present application. Detailed implementation manners

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some examples or embodiments of the present application. For those of ordinary skill in the art, without creative efforts, the present application can also be applied to other similar scenarios based on these drawings. It should be understood that these exemplary embodiments are only provided to enable those skilled in the relevant art to better understand and then implement the present invention, rather than limiting the scope of the present invention in any way. Unless obvious from the language context or otherwise stated, the same reference numerals in the figures represent the same structure or operation.

[0038] As shown in this application and the claims, unless the context clearly indicates otherwise, words such as "a", "an", "one", and / or "the" are not specifically singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment". The relevant definitions of other terms will be given in the following description. Hereinafter, without loss of generality, when describing the bone conduction related technology of the present invention, the description of "bone conduction speaker" or "bone conduction headphone" will be adopted. This description is only one form of bone conduction application. For those of ordinary skill in the art, "speaker" or "headphone" can also be replaced by other similar terms, such as "player", "hearing aid", etc. In fact, various implementation manners in the present invention can be conveniently applied to other non-speaker hearing devices. For example, for those skilled in the art, after understanding the basic principle of the bone conduction speaker, various modifications and changes in form and details may be made to the specific ways and steps of implementing the bone conduction speaker without departing from this principle. In particular, an ambient sound pickup and processing function is added to the bone conduction speaker to enable the speaker to implement the function of a hearing aid. For example, a microphone or other microphone can pick up the sound of the user / wearer's surrounding environment. Under a certain algorithm, the sound is processed (or the generated electrical signal) and transmitted to the bone conduction speaker part. That is, the bone conduction speaker can be modified to add the function of picking up ambient sound, and after a certain signal processing, the sound is transmitted to the user / wearer through the bone conduction speaker part, so as to implement the function of a bone conduction hearing aid. By way of example, the algorithms mentioned here may include one or a combination of noise cancellation, automatic gain control, acoustic feedback suppression, wide dynamic range compression, active environment recognition, active anti-noise, directional processing, tinnitus processing, multi-channel wide dynamic range compression, active howling suppression, volume control, etc.

[0039] Figure 1 is a structural block diagram of a bone conduction speaker according to some embodiments of the present application. As Figure 1 shown, the bone conduction speaker 100 may include a vibration component 110, a resonance component 120, and a fixing component 130.

[0040] The vibration assembly 110 can generate mechanical vibrations. The generation of mechanical vibrations is accompanied by energy conversion. The bone conduction speaker 100 can use the vibration assembly 110 to achieve the conversion of a signal containing sound information into mechanical vibrations. The conversion process may involve the coexistence and conversion of various different types of energy. For example, an electrical signal can be directly converted into mechanical vibrations through a transducer device in the vibration assembly 110 to produce sound. For another example, the sound information can be contained in an optical signal, and a specific transducer device can achieve the process of converting the optical signal into a vibration signal. Other types of energy that can coexist and be converted during the operation of the transducer device include thermal energy, magnetic field energy, etc. The energy conversion methods of the transducer device can include moving coil type, electrostatic type, piezoelectric type, moving iron type, pneumatic type, electromagnetic type, etc. In some embodiments, the vibration assembly 110 can include a vibration housing and a vibration element.

[0041] At least a part of the vibration housing can contact the human face to transmit the mechanical vibrations to the facial bones of the human body, enabling the human body to hear sound. The vibration housing can form a sealed or non-sealed accommodation space, and the vibration element can be disposed inside the vibration housing. In some embodiments, the vibration housing may not form an accommodation space but be directly connected to the vibration element. In some embodiments, the vibration housing can be directly or indirectly connected to the vibration element to transmit the mechanical vibrations of the vibration element to the auditory nerve through the bones, enabling the human body to hear sound.

[0042] In some embodiments, the vibration element (i.e., the transducer device) may include a magnetic circuit assembly. The magnetic circuit assembly may provide a magnetic field. The magnetic field may be used to convert a signal containing sound information into a mechanical vibration signal. In some embodiments, the sound information may include videos, audio files with a specific data format, or data or files that can be converted into sound through a specific means. The signal containing sound information may come from the storage component of the bone conduction speaker 100 itself or from an information generation, storage, or transmission system outside the bone conduction speaker 100. The signal containing sound information may include a combination of one or more of an electrical signal, an optical signal, a magnetic signal, a mechanical signal, etc. The signal containing sound information may come from one signal source or multiple signal sources. The multiple signal sources may be related or unrelated. In some embodiments, the bone conduction speaker 100 may obtain the signal containing sound information in a variety of different ways, and the acquisition of the signal may be wired or wireless, and may be real-time or delayed. For example, the bone conduction speaker 100 may receive an electrical signal containing sound information in a wired or wireless manner, or may directly obtain data from a storage medium to generate a sound signal. Another example is that the bone conduction speaker 100 may include a component with a sound collection function, which picks up the sound in the environment, converts the mechanical vibration of the sound into an electrical signal, and obtains an electrical signal that meets specific requirements after being processed by an amplifier. In some embodiments, the wired connection may include a metal cable, an optical cable, or a hybrid cable of metal and optical, for example, a coaxial cable, a communication cable, a flexible cable, a spiral cable, a non-metallic sheathed cable, a metallic sheathed cable, a multi-core cable, a twisted pair cable, a ribbon cable, a shielded cable, a telecommunications cable, a twin cable, a parallel twin conductor, a twisted pair, etc., a combination of one or more of the above. The examples described above are only for convenience of illustration, and the medium of the wired connection may also be other types, for example, other transmission carriers of electrical signals or optical signals, etc.

[0043] Wireless connections can include radio communication, free space optical communication, acoustic communication, and electromagnetic induction, etc. Among them, radio communication can include IEEE 802.11 series standards, IEEE 802.15 series standards (such as Bluetooth technology and cellular technology, etc.), the first generation of mobile communication technology, the second generation of mobile communication technology (such as FDMA, TDMA, SDMA, CDMA, and SSMA, etc.), General Packet Radio Service technology, the third generation of mobile communication technology (such as CDMA2000, WCDMA, TD-SCDMA, and WiMAX, etc.), the fourth generation of mobile communication technology (such as TD-LTE and FDD-LTE, etc.), satellite communication (such as GPS technology, etc.), Near Field Communication (NFC) and other technologies operating in the ISM band (such as 2.4 GHz, etc.); free space optical communication can include visible light, infrared signals, etc.; acoustic communication can include sound waves, ultrasonic signals, etc.; electromagnetic induction can include near field communication technology, etc. The examples described above are only for convenience of illustration, and the medium of wireless connection can also be other types, for example, Z-wave technology, other licensed civilian radio bands and military radio bands, etc. For example, as some application scenarios of the present technology, the bone conduction speaker 100 can obtain signals containing sound information from other devices through Bluetooth technology.

[0044] The resonance component 120 is connected to the vibration component 110. When the vibration component 110 generates mechanical vibration, at least a part of the mechanical vibration can be transmitted to the resonance component 120, causing the resonance component 120 to vibrate, thereby weakening the vibration amplitude of the vibration component 110. In some embodiments, the resonance component 120 can include a first elastic element and a mass element, and the mass element can be connected to the vibration component 110 through the first elastic element. The vibration component 110 can transmit mechanical vibration to the mass element through the first elastic element, causing the mass element to vibrate.

[0045] The fixing component 130 can fixedly support the vibration component 110 and the resonance component 120, so as to maintain stable contact between the bone conduction speaker 100 and the user's face. The fixing component 130 can include one or more fixing connectors. The one or more fixing connectors can connect the vibration component 110 and / or the resonance component 120. In some embodiments, the fixing component 130 can achieve binaural wearing. For example, both ends of the fixing component 130 can be fixedly connected to two groups of vibration components 110 (or resonance components 120) respectively. When the user wears the bone conduction speaker 100, the fixing component 130 can fix the two groups of vibration components 110 (or resonance components 120) near the user's left and right ears respectively. In some embodiments, the fixing component 130 can also achieve monaural wearing. For example, the fixing component 130 can be fixedly connected to only one group of vibration components 110 (or resonance components 120). When the user wears the bone conduction speaker 100, the fixing component 130 can fix the vibration component 110 (or resonance component 120) near one ear of the user. In some embodiments, the fixing component 130 can be any combination of one or more of glasses (such as sunglasses, augmented reality glasses, virtual reality glasses), helmets, headbands, etc., which are not limited herein.

[0046] The above description of the structure of the bone conduction speaker is only a specific example and should not be regarded as the only feasible implementation. Obviously, for professionals in the field, after understanding the basic principle of the bone conduction speaker, various modifications and changes in form and details may be made to the specific ways and steps of implementing the bone conduction speaker 100 without departing from this principle, but these modifications and changes are still within the scope described above. For example, the bone conduction speaker 100 can include one or more processors, and the processor can execute one or more sound signal processing algorithms. The sound signal processing algorithm can correct or enhance the sound signal. For example, noise reduction, acoustic feedback suppression, wide dynamic range compression, automatic gain control, active environment recognition, active noise cancellation, directional processing, tinnitus processing, multi-channel wide dynamic range compression, active howling suppression, volume control, or other similar, or any combination of the above processing can be performed on the sound signal, and these modifications and changes are still within the scope of protection of the claims of the present invention. Another example is that the bone conduction speaker 100 can include one or more sensors, such as a temperature sensor, a humidity sensor, a speed sensor, a displacement sensor, etc. The sensor can collect user information or environmental information.

[0047] Figure 2 is a longitudinal sectional view of a bone conduction speaker without a resonance component shown according to some embodiments of the present application. As Figure 2 shown, in some embodiments, the bone conduction speaker 200 can include a vibration component 210 and a fixing component 230.

[0048] In some embodiments, the vibration assembly 210 may include a vibration element 211, a vibration housing 213, and a second elastic element 215 that elastically connects the vibration element 211 and the vibration housing 213. The vibration element 211 may convert a sound signal into a mechanical vibration signal and thereby generate mechanical vibrations. When the vibration element 211 generates mechanical vibrations, the vibration housing 213 may be driven to vibrate through the second elastic element 215. It should be noted that when the vibration element 211 transfers the mechanical vibrations to the vibration housing 213 through the second elastic element 215, the vibration frequency of the vibration housing 213 is the same as that of the vibration element 211.

[0049] The vibration element 211 described in the present application may refer to an element that converts a sound signal into a mechanical vibration signal. For example, a transducer. In some embodiments, the vibration element 211 may include a magnetic circuit assembly and a coil. The magnetic circuit assembly may be used to form a magnetic field, and the coil may generate mechanical vibrations in this magnetic field. Specifically, a signal current may be passed through the coil. The coil is in the magnetic field formed by the magnetic circuit assembly and is subjected to the Ampere force, receiving the drive to generate mechanical vibrations. At the same time, the magnetic circuit assembly receives a reaction force opposite to that of the coil. Under the action of the Ampere force, the vibration element 211 may generate mechanical vibrations. And the mechanical vibrations of the vibration element 211 may be transferred to the vibration housing 213, causing the vibration housing 213 to vibrate accordingly.

[0050] In some embodiments, the vibration housing 213 may include a housing panel 2131, housing side plates 2132, and a housing back plate 2133. The housing panel 2131 may refer to the side of the vibration housing 213 that contacts the user's face when the user wears the bone conduction speaker 200. And the housing back plate 2133 is located on the side opposite to the housing panel 2131. In some embodiments, the housing panel 2131 and the housing back plate 2133 are respectively disposed on the two end faces of the housing side plates 2132. The housing panel 2131, the housing side plates 2132, and the housing back plate 2133 may form a shell-like structure with a certain accommodation space. In some embodiments, the vibration element 211 may be disposed inside the shell-like structure.

[0051] In some embodiments, the housing panel 2131, the housing side plates 2132, and the housing back plate 2133 may be made of the same or different materials. For example, the housing panel 2,131 and the housing side plates 2132 may be made of the same material, while the material for making the housing back plate 2133 may be different from the former two. In some embodiments, the housing panel 2131, the housing side plates 2132, and the housing back plate 2133 may be made of different materials respectively.

[0052] In some embodiments, the materials for fabricating the housing panel 2131 include, but are not limited to, acrylonitrile butadiene styrene (ABS), polystyrene (PS), high impact polystyrene (HIPS), polypropylene (PP), polyethylene terephthalate (PET), polyester (PES), polycarbonate (PC), polyamides (PA), polyvinyl chloride (PVC), polyurethanes (PU), polyvinylidene chloride, polyethylene (PE), polymethyl methacrylate (PMMA), poly-ether-ether-ketone (PEEK), phenolics (PF), urea-formaldehyde (UF), melamine formaldehyde (MF), and any materials or combinations of the above materials among some metals, alloys (such as aluminum alloy, chrome molybdenum steel, scandium alloy, magnesium alloy, titanium alloy, magnesium lithium alloy, nickel alloy, etc.), glass fiber or carbon fiber. In some embodiments, the materials for fabricating the housing panel 2131 are any combinations of glass fiber, carbon fiber and materials such as polycarbonate (PC), polyamides (PA), etc. In some embodiments, the materials for fabricating the housing panel 2131 can be made by mixing carbon fiber and polycarbonate (PC) in a certain proportion. In some embodiments, the materials for fabricating the housing panel 2131 can be made by mixing carbon fiber, glass fiber and polycarbonate (PC) in a certain proportion. In some embodiments, the materials for fabricating the housing panel 2131 can be made by mixing glass fiber and polycarbonate (PC) in a certain proportion, or by mixing glass fiber and polyamides (PA) in a certain proportion.

[0053] In some embodiments, the housing panel 2131 needs to have a certain thickness to ensure its stiffness. In some embodiments, the thickness of the housing panel 2131 is not less than 0.3 mm. Preferably, the thickness of the housing panel 2131 is not less than 0.5 mm. More preferably, the thickness of the housing panel 2131 is not less than 0.8 mm. More preferably, the thickness of the housing panel 2131 is not less than 1 mm. However, as the thickness increases, the weight of the vibrating housing also increases, thereby increasing the self-weight of the bone conduction speaker 200 and affecting the sensitivity of the bone conduction speaker 200. Therefore, the thickness of the housing panel 2131 should not be too large. In some embodiments, the thickness of the housing panel 2131 does not exceed 2.0 mm. Preferably, the thickness of the housing panel 2131 does not exceed 1.5 mm.

[0054] In some embodiments, the housing panel 2131 can be set in different shapes. For example, the housing panel 2131 can be set in a square, rectangle, approximate rectangle (for example, a structure in which the four corners of the rectangle are replaced with arcs), ellipse, circle or any other shape.

[0055] In some embodiments, the housing panel 2131 may be composed of the same material. In some embodiments, the housing panel 2131 may be formed by laminating two or more materials. In some embodiments, the housing panel 2131 may be composed of a material with a relatively large Young's modulus plus a material with a relatively small Young's modulus. The advantage of this is that while ensuring the stiffness requirements of the housing panel 2131, it can also increase the comfort of contact with the human face and improve the fit between the housing panel 2131 and the human face. In some embodiments, the material with a relatively large Young's modulus may be acrylonitrile butadiene styrene (ABS), polystyrene (PS), high impact polystyrene (HIPS), polypropylene (PP), polyethylene terephthalate (PET), polyester (PES), polycarbonate (PC), polyamides (PA), polyvinyl chloride (PVC), polyurethanes (PU), polyvinylidene chloride, polyethylene (PE), polymethyl methacrylate (PMMA), poly-ether-ether-ketone (PEEK), phenolics (PF), urea-formaldehyde (UF), melamine formaldehyde (MF), as well as any material or combination of the above materials such as some metals, alloys (such as aluminum alloy, chromium molybdenum steel, scandium alloy, magnesium alloy, titanium alloy, magnesium lithium alloy, nickel alloy, etc.), glass fiber or carbon fiber.

[0056] In some embodiments, the contact portion of the housing panel 2131 with the human skin may be the entire area or a partial area of the housing panel 2131. For example, the housing panel 2131 is an arc structure, and only a partial area on the arc structure contacts the human skin. In some embodiments, the housing panel 2131 and the human skin may be in surface contact. In some embodiments, the surface of the housing panel 2131 in contact with the human body may be a flat surface. In some embodiments, the outer surface of the housing panel 2131 may have some protrusions or pits. In some embodiments, the outer surface of the housing panel 2131 may be a curved surface with any contour.

[0057] It should be noted that since the vibration element 211 includes a magnetic circuit assembly and the vibration element 211 is accommodated in the vibration housing 213. Therefore, when the volume of the vibration housing 213 (i.e., the volume of the accommodation space) is larger, a larger magnetic circuit assembly can be accommodated inside the vibration housing 213, so that the bone conduction speaker 200 has higher sensitivity. The sensitivity of the bone conduction speaker 200 can be reflected by the volume generated by the bone conduction speaker 200 under a certain input sound signal. When the same sound signal is input, the larger the volume generated by the bone conduction speaker 200, the higher the sensitivity of the bone conduction speaker 200. In some embodiments, the volume of the bone conduction speaker 200 increases as the volume of the accommodation space of the vibration housing 213 increases. Therefore, there are also certain requirements for the volume of the vibration housing 213 in this application. In some embodiments, in order to enable the bone conduction speaker 200 to have higher sensitivity (volume), the volume of the vibration housing 213 can be 2000 mm 3 ~6000 mm 3 . Preferably, the volume of the vibration housing 213 can be 2000 mm 3 ~5000 mm 3 . Preferably, the volume of the vibration housing 213 can be 2800 mm 3 ~5000 mm 3 . Preferably, the volume of the vibration housing 213 can be 3500 mm 3 ~5000 mm 3 . Preferably, the volume of the vibration housing 213 can be 1500 mm 3 ~3500 mm 3 . Preferably, the volume of the vibration housing 213 can be 1500 mm 3 ~2500 mm 3 .

[0058] The fixing component 230 is fixedly connected to the vibration housing 213 of the vibration component 210. The fixing component 230 is used to maintain the stable contact between the bone conduction speaker 200 and human tissues or bones, avoid the shaking of the bone conduction speaker 200, and ensure that the housing panel 2131 can stably transmit sound. In some embodiments, the fixing component 230 can be an arc-shaped elastic component, which can form a force that rebounds towards the middle of the arc, so as to be able to stably contact the human skull. Taking the ear hook as an example of the fixing component, in Figure 2Based on this, the top p point of the earhook fits well with the human head, and the top p point can be considered as a fixed point. The earhook is fixedly connected to the side plate 2132 of the housing. The ways of fixed connection include bonding and fixing with glue, or fixing the earhook to the side plate 2132 or the back plate 2133 of the housing by means of snap connection, welding or screw connection. The part of the earhook connected to the vibration housing 213 can be made of the same, different or partially the same material as the side plate 2132 or the back plate 2133 of the housing. In some embodiments, in order to make the earhook have a smaller stiffness (i.e., a smaller stiffness coefficient), the earhook can also include plastic, silica gel and / or metal materials. For example, the earhook can include an arc-shaped titanium wire. Optionally, the earhook can be integrally formed with the side plate 2132 or the back plate 2133 of the housing. More examples of the vibration assembly 210 and the vibration housing 213 can be found in the PCT applications with application numbers PCT / CN2019 / 070545 and PCT / CN2019 / 070548 filed on January 5, 2019, the entire contents of which are incorporated into this application by reference.

[0059] As described above, the vibration assembly 210 can further include a second elastic element 215. The second elastic element 215 can be used to elastically connect the vibration element 211 to the vibration housing 213, so that the mechanical vibration of the vibration element 211 can be transmitted to the vibration housing 213 through the second elastic element 215. When the vibration housing 213 generates mechanical vibration, it contacts the wearer's (or user's) face, and transmits the mechanical vibration to the auditory nerve via the bone, enabling the human body to hear sound.

[0060] In some embodiments, the vibration element 211 and the second elastic element 215 can be accommodated inside the vibration housing 213, and the second elastic element 215 can connect the vibration element 211 to the inner wall of the vibration housing 213. In some embodiments, the second elastic element 215 can include a first part and a second part. The first part of the second elastic element 215 can be connected to the vibration element 211 (for example, the magnetic circuit assembly of the vibration element 211), and the second part of the second elastic element 215 can be connected to the inner wall of the vibration housing 213.

[0061] In some embodiments, the second elastic element 215 can be a vibration transmission sheet. The first part of the vibration transmission sheet can be connected to the vibration element 211, and the second part of the vibration transmission sheet can be connected to the vibration housing 213. Specifically, the first part of the vibration transmission sheet can be connected to the magnetic circuit assembly of the vibration element 211, and the second part of the vibration transmission sheet can be connected to the inner wall of the vibration housing 213. Optionally, the vibration transmission sheet has an annular structure, and the first part of the vibration transmission sheet is closer to the central region of the vibration transmission sheet than the second part. For example, the first part of the vibration transmission sheet can be located in the central region of the vibration transmission sheet, while the second part is located on the periphery of the vibration transmission sheet.

[0062] In some embodiments, the vibration transmission sheet can be an elastic member so as to be able to transmit the mechanical vibration of the vibration element 211 to the vibration housing 213. The elasticity of the vibration transmission sheet can be determined by various aspects such as the material, thickness, and structure of the vibration transmission sheet.

[0063] In some embodiments, the materials for making the vibration transmission sheet include but are not limited to plastics (such as, but not limited to, high molecular polyethylene, blow molding nylon, engineering plastics, etc.), steel materials (such as, but not limited to, stainless steel, carbon steel, etc.), light alloys (such as, but not limited to, aluminum alloy, beryllium copper, magnesium alloy, titanium alloy, etc.), and can also be other single or composite materials that can achieve the same performance. Among them, the composite materials can include but are not limited to reinforcing materials such as glass fiber, carbon fiber, boron fiber, graphite fiber, graphene fiber, silicon carbide fiber, or aramid fiber, or composites of other organic and / or inorganic materials. For example, various fiberglass reinforced plastics composed of glass fiber reinforced unsaturated polyester, epoxy resin, or phenolic resin matrix.

[0064] In some embodiments, the vibration transmission sheet can have a certain thickness. In some embodiments, the thickness of the vibration transmission sheet is not less than 0.005 mm. Preferably, in some embodiments, the thickness of the vibration transmission sheet is 0.005 mm to 3 mm. More preferably, the thickness of the vibration transmission sheet is 0.01 mm to 2 mm. More preferably, the thickness of the vibration transmission sheet is 0.01 mm to 1 mm. Further preferably, the thickness of the vibration transmission sheet is 0.02 mm to 0.5 mm.

[0065] In some embodiments, the elasticity of the vibration transmission sheet can be provided by the structure of the vibration transmission sheet. For example, the vibration transmission sheet can be an elastic structure body. Even if the stiffness of the material for making the vibration transmission sheet is relatively high, the elasticity can be provided through its structure. In some embodiments, the structure of the vibration transmission sheet can include but is not limited to a structure similar to a spring, a ring-shaped or similar ring-shaped structure, etc. In some embodiments, the structure of the vibration transmission sheet can also be set as a sheet shape. In some embodiments, the structure of the vibration transmission sheet can also be set as a strip shape. The specific structure of the vibration transmission sheet can be combined based on the materials, thickness, and structure described above to form different vibration transmission sheets. For example, the sheet-shaped vibration transmission sheet can have different thickness distributions, and the thickness of the first part of the vibration transmission sheet is greater than the thickness of the second part of the vibration transmission sheet. In some embodiments, the number of vibration transmission sheets can be one or multiple. For example, the number of vibration transmission sheets can be two. The second parts of the two vibration transmission sheets are respectively connected to the inner walls of two relatively positioned housing side plates 2132, and the first parts of the two vibration transmission sheets are both connected to the vibration element 211.

[0066] In some embodiments, the vibration transmission piece can be directly connected to the vibration housing 213 and the vibration element 211. In some embodiments, the vibration transmission piece can be connected to the vibration element 211 and the vibration housing 213 by adhesive. In some embodiments, the vibration transmission piece can also be fixed to the vibration element 211 and the vibration housing 213 by welding, clamping, riveting, threaded connection (for example, connected by components such as screws, bolts, studs, bolts), clamp connection, pin connection, key connection, or integral molding. For more examples of the vibration transmission piece, reference can be made to the PCT applications with application numbers PCT / CN2019 / 070545 and PCT / CN2019 / 070548 filed on January 5, 2019, the entire contents of which are incorporated herein by reference.

[0067] In some embodiments, the vibration assembly 210 may further include a first connecting member. The vibration transmission piece can be connected to the vibration element 211 through the first connecting member. In some embodiments, the first connecting member can be fixedly connected to the vibration element 211, as Figure 2 shown. For example, the first connecting member can be fixed on the surface of the vibration element 211. In some embodiments, the first part of the vibration element 211 can be fixedly connected to the first connecting member. In some embodiments, the vibration transmission piece can also be fixed to the first connecting member by welding, clamping, riveting, threaded connection (for example, connected by components such as screws, bolts, studs, bolts), clamp connection, pin connection, key connection, or integral molding. In some embodiments, the vibration assembly 210 may further include a second connecting member (not shown in the figure), and the second connecting member can be fixed to the inner wall of the vibration housing 213. For example, the second connecting member can be fixed to the inner wall of the housing side plate 2132. The vibration transmission piece can be connected to the vibration housing 213 through the second connecting member. In some embodiments, the second part of the vibration element 211 can be fixedly connected to the second connecting member. The connection manner between the second connecting member and the vibration transmission piece can be the same as or similar to the connection manner between the first connecting member and the vibration transmission piece in the foregoing embodiments, and will not be elaborated herein.

[0068] Figure 3It is a partial frequency response curve of a bone conduction speaker without adding a resonance component as shown in some embodiments of the present application. The horizontal axis is the frequency, and the vertical axis is the vibration intensity (or vibration amplitude) of the bone conduction speaker 200. The vibration intensity mentioned here can also be understood as the vibration acceleration of the bone conduction speaker 200. The larger the value on the vertical axis, the larger the vibration amplitude of the bone conduction speaker 200, which also indicates that the vibration feeling of the bone conduction speaker 200 is stronger. For convenience of description, in some embodiments, the sound frequency range below 500 Hz can be called the low-frequency region, the sound frequency range of 500 Hz to 4000 Hz can be called the mid-frequency region, and the sound frequency range greater than 4000 Hz can be called the high-frequency region. In some embodiments, the sound in the low-frequency region will bring a relatively obvious vibration feeling to the user. If there is a very sharp peak in the low-frequency region (that is, the vibration acceleration of certain frequencies is much higher than that of other nearby frequencies), on the one hand, the sound heard by the user will be relatively harsh and sharp, and on the other hand, the strong vibration feeling will also bring an uncomfortable feeling. Therefore, within the low-frequency region range, it is not desirable to have very sharp peaks and valleys, and the flatter the frequency response curve, the better the sound effect of the bone conduction speaker 200.

[0069] As Figure 3 shown, the bone conduction speaker 200 generates a low-frequency resonance peak in the low-frequency region (near 100 Hz). This low-frequency resonance peak may be generated by the combined action of the vibration component 210 and the fixed component 230. The vibration acceleration of this low-frequency resonance peak is relatively large, resulting in a strong vibration feeling of the vibration panel 2131, making the user feel pain in the face when wearing the bone conduction speaker 200, which affects the comfort and experience of the user.

[0070] Figure 4 It is a schematic longitudinal sectional view of a bone conduction speaker with a resonance component added as shown in some embodiments of the present application. As Figure 4 shown, in some embodiments, the bone conduction speaker 400 includes a vibration component 410 and a resonance component 420. The resonance component 420 is elastically connected to the vibration component 410. When the vibration component 410 undergoes mechanical vibration, it can transmit the mechanical vibration to the resonance component 420. When the resonance component 420 is forced to vibrate, it can absorb the mechanical energy of the vibration component 410, thereby achieving the purpose of reducing the vibration amplitude of the vibration component 410.

[0071] In some embodiments, the vibration assembly 410 may include a vibration element 411, a vibration housing 413, and a second elastic element 415. The vibration housing 413 is elastically connected to the vibration element 411 through the second elastic element 415. When the vibration element 411 undergoes mechanical vibration, it can drive the vibration housing 413 to undergo mechanical vibration. In some embodiments, the vibration element 411, the vibration housing 413, and the second elastic element 415 are the same as or similar to the vibration element 211, the vibration housing 213, and the second elastic element 215 in the bone conduction speaker 200, respectively, and the details of their structures will not be elaborated here.

[0072] In some embodiments, the resonance assembly 420 may include a mass element 421 and a first elastic element 423, and the first elastic element 423 is fixedly connected to the mass element 421. The mass element 421 can be connected to the vibration assembly 410 through the first elastic element 423. The vibration housing 413 can transmit mechanical vibration to the mass element 421 through the first elastic element 423, driving the mass element 421 to perform mechanical vibration. When the mass element 421 generates mechanical vibration, it can weaken the vibration acceleration of the vibration housing 413, that is, the vibration intensity, thereby reducing the vibration sensation of the vibration housing 413 and improving the user experience. In some embodiments, the first elastic element 423 can be connected to any other position on the vibration housing 413, except for the housing panel on the vibration housing 413 that directly contacts the user. For example, the first elastic element 423 can be connected to the housing side plate 4132 or the housing back plate 4133. In this case, since the resonance assembly 420 does not directly contact the human skin, the vibration of the resonance assembly 420 will not make the user feel an uncomfortable vibration sensation. In Figure 4 the example shown, the first elastic element 423 can be connected to the outside of the vibration housing 413 on the side opposite to the housing panel 4131.

[0073] Figure 5 is a partial frequency response curve graph of a bone conduction speaker with a resonance assembly added according to some embodiments of the present application. Figure 5 The frequency response curve of the resonance assembly is also shown. According to Figure 5 it can be seen that under the influence of the resonance assembly 420, the frequency response curve of the bone conduction speaker 400 in the low-frequency region will become flatter, avoiding the strong vibration sensation caused by sharp resonance peaks and improving the user experience.

[0074] For ease of understanding, when the bone conduction speaker does not include a resonance assembly, the mechanical model of the bone conduction speaker can be equivalent to Figure 10The model shown. Specifically, the vibrating panel and the vibrating element can be simplified into mass blocks m1 and m2 respectively, the earhook can be simplified into an elastic connector k1, and the second elastic element can be simplified into an elastic connector k2. The damping of the elastic connectors k1 and k2 are R1 and R2 respectively. The vibrating panel and the vibrating element are respectively acted upon by forces F and –F to generate vibrations. The composite vibration system composed of the vibrating panel, the vibrating element, the vibration transmission piece, and the earhook is fixed at point p at the top of the earhook.

[0075] Similarly, for ease of understanding, when the bone conduction speaker includes a resonance component, the mechanical model of the bone conduction speaker can be equivalent to Figure 11 The model shown.

[0076] Specifically, m1 and m2 respectively represent the masses of the vibrating housing and the vibrating element, m3 represents the mass of the mass element in the resonance component, k1 and R1 respectively represent the elasticity and damping of the fixing component, k2 and R2 respectively represent the elasticity and damping of the second elastic element, and k3 and R3 represent the elasticity and damping of the first elastic element. The entire composite vibration system is fixed at point p at the top of the earhook. The vibrating surface housing and the vibrating element are respectively acted upon by forces F and –F to generate vibrations. After adding the resonance component, it is equivalent to increasing the stiffness and damping of the vibrating housing. At the same time, the Ampere force F does not change, and the reaction force -F of the Ampere force also does not change. However, the stiffness and damping of the vibrating housing both increase. Therefore, the addition of the resonance component can weaken the vibration amplitude of the vibrating housing.

[0077] It can be understood that the vibration component 410 and the resonance component 420 can each generate a low-frequency resonance peak in the low-frequency region. By using the resonance component 420 to absorb the mechanical vibration of the vibrating housing 413, the purpose of weakening the mechanical vibration amplitude of the vibrating housing 413 at its resonance peak can be achieved. Specifically, as Figure 5 shown, the curve "without resonance component" represents the frequency response when the resonance component 420 is not added to the bone conduction speaker 400. It can be seen that the vibration component 410 (combined with the fixing component 230) can generate a first low-frequency resonance peak 450 at the first frequency f. The curve "with resonance component - resonance component" represents the frequency response of the resonance component 420 itself. It can be seen that the resonance component 420 can generate a second low-frequency resonance peak 460 at the second frequency f0. The curve "with resonance component - bone conduction speaker" represents the frequency response of the bone conduction speaker 400 generated by the interaction between the vibration component 410 and the resonance component 420. It can be seen that the frequency response of the bone conduction speaker 400 with the resonance component 420 added in the low-frequency region is compared with that of the bone conduction speaker without the resonance component 420 added (for example, Figure 2The bone conduction speaker 200 shown has a flatter frequency response in the low-frequency region, and its amplitude near the first frequency f is significantly lower than that without the resonance component 420 added. The first frequency f is the natural frequency of the vibration component 410 (combined with the fixing component 230), and the second frequency f0 is the natural frequency of the resonance component 420. In some embodiments, the natural frequency is related to the material, mass, elastic coefficient, and shape of the structure itself.

[0078] It should be noted that the vibration element 411 transfers mechanical vibration to the vibration housing 413 through the second elastic element 415, and the vibration housing 413 vibrates under forced vibration. The vibration frequency of the vibration housing 413 is the same as that of the vibration element 411. Similarly, the vibration housing 413 transfers mechanical vibration to the mass element 421 of the resonance component 420 through the first elastic element 423, causing the mass element 421 to move under forced vibration. The vibration frequency of the mass element 421 is the same as that of the vibration housing 413. From Figure 5 this, it can be seen that in the frequency response of the resonance component 420 itself, in the range from 100 Hz to the second frequency f0, the vibration acceleration of the resonance component 420 increases as the frequency increases. When the frequency is the second frequency f0, a second low-frequency resonance peak 460 appears. When the frequency continues to increase, the vibration acceleration of the resonance component 420 decreases as the frequency increases. It can be understood that the frequency response of this resonance component 420 can reflect the response of the resonance component 420 to vibrations of different frequencies from the outside world (i.e., the vibration of the vibration housing 413). For example, at and near the second frequency f0, the resonance component 420 absorbs the most mechanical energy from the vibration housing 413. The advantage of this is that the resonance component 420 mainly reduces the vibration of the vibration housing 413 near its low-frequency resonance peak, and has little or almost no effect on the vibration of the vibration housing 413 near non-low-frequency resonance peaks, so that the final frequency response curve of the bone conduction speaker 400 can be made flatter and the sound quality better.

[0079] In some embodiments, in order to weaken the vibration intensity of the first low-frequency resonance peak 450 of the vibration housing 413, the frequency f0 corresponding to the second resonance peak 460 of the resonance component 420 can be set near the frequency f corresponding to the first resonance peak 450 of the vibration housing 413. Refer to Figure 5 shown, in some embodiments, the ratio of the second frequency f0 to the first frequency f is in the range of 0.5 to 2. Preferably, the ratio of the second frequency f0 to the first frequency f is in the range of 0.65 to 1.5. More preferably, the ratio of the second frequency f0 to the first frequency f is in the range of 0.75 to 1.25. More preferably, the ratio of the second frequency f0 to the first frequency f is in the range of 0.85 to 1.15. Further preferably, the ratio of the second frequency f0 to the first frequency f is in the range of 0.9 to 1.1.

[0080] To broaden the frequency response range of the bone conduction speaker 400, the structures and materials of the vibration assembly 410 and the resonance assembly 420 can be changed to set their low-frequency resonance peaks at lower frequencies. In some embodiments, the first low-frequency resonance peak 450 and the second low-frequency resonance peak 460 can both be located within the low-frequency region. Preferably, the first frequency f and the second frequency f0 can both be less than 800 Hz. More preferably, the first frequency f and the second frequency f0 can both be less than 700 Hz. More preferably, the first frequency f and the second frequency f0 can both be less than 600 Hz. Further preferably, the first frequency f and the second frequency f0 can both be less than 500 Hz.

[0081] In some embodiments, by optimizing the structures and materials of the resonance assembly 420 (for example, optimizing the mass of the mass element 421, the elastic coefficient of the first elastic element 423, etc.), after the vibration housing 413 transfers the vibration to the resonance assembly 420, the resonance assembly 420 can generate a greater vibration than the vibration housing 413. For example, within at least part of the frequency range less than (or greater than) the first frequency f, the amplitude of the vibration of the resonance assembly 420 can be greater than the amplitude of the vibration of the vibration housing 413. At this time, since the resonance assembly 420 does not directly contact the user, the large-amplitude vibration of the resonance assembly 420 will not make the user feel uncomfortable vibration. Further, since the amplitude of the resonance assembly 420 is large, the mass element 421 in the resonance assembly 420 can be designed as a structure with a large area. While the resonance assembly 420 vibrates, the vibration of the large-area mass element 421 can drive the air to vibrate, generating low-frequency air conduction sound, thereby enhancing the low-frequency response of the bone conduction speaker 400.

[0082] Further, from Figure 5 it can be known that under the interaction of the vibration housing 413 and the resonance assembly 420, the bone conduction speaker 400 can generate two low-frequency resonance peaks within the low-frequency region range, namely the third low-frequency resonance peak 471 and the fourth low-frequency resonance peak 473. The vibration accelerations of the third low-frequency resonance peak 471 and the fourth low-frequency resonance peak 473 are less than those of the first low-frequency resonance peak 450, which means that the bone conduction speaker 400 with the resonance assembly 420 added compared to the bone conduction speaker without the resonance assembly 420 added (for example, Figure 2For the bone conduction speaker 200 shown, the vibration amplitude of the low-frequency resonance peak is smaller, and the user has a better experience when wearing the bone conduction speaker 400. In some embodiments, the bone conduction speaker can generate two low-frequency resonance peaks within a frequency range less than 450 Hz. Preferably, the bone conduction speaker 400 can generate two low-frequency resonance peaks within a frequency range less than 400 Hz. More preferably, the bone conduction speaker 400 can generate two low-frequency resonance peaks within a frequency range less than 350 Hz. Further preferably, the bone conduction speaker 400 can generate two low-frequency resonance peaks within a frequency range less than 300 Hz. Further preferably, the bone conduction speaker 400 can generate two low-frequency resonance peaks within a frequency range less than 200 Hz.

[0083] When the mass m3 of the mass element 421 of the resonance assembly 420 is very small, the influence of the resonance assembly 420 on the amplitude of the mechanical vibration of the vibration housing 413 is very small, resulting in the inability to effectively attenuate the mechanical vibration near the first low-frequency resonance peak 450 of the vibration housing 413. For example, if the mass m3 of the mass element 421 of the resonance assembly 420 is too small, even if the resonance assembly 420 is added, the vibration acceleration of the first low-frequency resonance peak 450 of the vibration housing 413 is still large, and the vibration sensation of the bone conduction speaker 400 cannot be effectively attenuated. When the mass m3 of the mass element 421 of the resonance assembly 420 is very large, the influence of the resonance assembly 420 on the amplitude of the mechanical vibration of the bone conduction speaker 400 is too large, and the frequency response of the bone conduction speaker 400 will be significantly changed. Therefore, the mass m3 of the mass element 421 of the resonance assembly 420 needs to be controlled within a certain range.

[0084] In some embodiments, the ratio of the mass m3 of the mass element 421 of the resonance assembly 420 to the mass m1 of the vibration housing 413 is in the range of 0.04 to 1.25. Preferably, the ratio of the mass m3 of the mass element 421 of the resonance assembly 420 to the mass m1 of the vibration housing 413 is in the range of 0.05 to 1.2. Preferably, the ratio of the mass m3 of the mass element 421 of the resonance assembly 420 to the mass m1 of the vibration housing 413 is in the range of 0.06 to 1.1. More preferably, the ratio of the mass m3 of the mass element 421 of the resonance assembly 420 to the mass m1 of the vibration housing 413 is in the range of 0.07 to 1.05. More preferably, the ratio of the mass m3 of the mass element 421 of the resonance assembly 420 to the mass m1 of the vibration housing 413 is in the range of 0.08 to 0.9. More preferably, the ratio of the mass m3 of the mass element 421 of the resonance assembly 420 to the mass m1 of the vibration housing 413 is in the range of 0.09 to 0.75. More preferably, the ratio of the mass m3 of the mass element 421 of the resonance assembly 420 to the mass m1 of the vibration housing 413 is in the range of 0.1 to 0.6.

[0085] Figure 6 is a longitudinal sectional view of another bone conduction speaker according to some embodiments of the present application. As Figure 6 shown, the bone conduction speaker 600 may include a vibration assembly 610 and a resonance assembly 620. The vibration assembly 610 may generate mechanical vibrations. The resonance assembly 620 may receive the mechanical vibrations from the vibration assembly 610 and attenuate the amplitude of the mechanical vibrations of the vibration assembly 610.

[0086] In some embodiments, the vibration assembly 610 may include a vibration element 611, a vibration housing 613, and a second elastic element 615. The vibration element 611 may be elastically connected to the vibration housing 613 through the second elastic element 615. When the vibration element 611 undergoes mechanical vibrations, it may drive the vibration housing 613 to perform mechanical vibrations, and then transmit the vibrations to the tissues and bones of the user's face, and transmit them to the auditory nerve through the tissues and bones, enabling the user to hear sounds. In some embodiments, the vibration element 611, the vibration housing 613, and the second elastic element 615 are the same as or similar to the vibration element 211, the vibration housing 213, and the second elastic element 215 in the bone conduction speaker 200 respectively, and the details of their structures will not be elaborated here.

[0087] In some embodiments, the resonance assembly 620 may include a first elastic element 623 and a mass element 621. The mass element 621 may be elastically connected to the vibration housing 613 through the first elastic element 623. The vibration housing 613 transmits the vibrations to the mass element 621 through the first elastic element 623, so that the mechanical vibrations of the vibration housing 613 are partially absorbed by the mass element 621, thereby attenuating the vibration amplitude of the vibration housing 613.

[0088] As Figure 6 shown, the resonance assembly 620 may be accommodated in the vibration housing 613, and the resonance assembly 620 may be connected to the inner wall of the vibration housing 613 through the first elastic element 623.

[0089] In some embodiments, the first elastic element 623 may include a diaphragm. The peripheral side of the diaphragm may be connected through a support structure or directly connected to the inside of the housing side plate 6132 of the vibration housing 613. The housing side plate 6132 is a side wall surrounding the housing panel 6131. When the vibration housing 613 vibrates, the housing side plate 6132 may cause the diaphragm to vibrate. Since the diaphragm here relies on being connected to the vibration housing 613 and vibrates through the drive of the vibration housing 613, it may be called a passive diaphragm. In some embodiments, the diaphragm may include, but is not limited to, a plastic diaphragm, a metal diaphragm, a paper diaphragm, a biological diaphragm, etc.

[0090] In some embodiments, the mass element 621 may include a composite structure. The composite structure may be attached to the surface of the diaphragm to form a composite diaphragm (i.e., the resonant assembly 620). The composite structure attached to the surface of the diaphragm mainly serves the following functions: (1) The mass element 621 can act as a counterweight element to adjust the mass of the composite diaphragm, so that the overall mass of the composite diaphragm is within a certain range, enabling the passive diaphragm itself to have a relatively large vibration amplitude, and effectively reducing the vibration amplitude of the bone conduction speaker 600 in the low-frequency range; (2) The mass element 621 and the diaphragm are combined to form a composite diaphragm structure with higher stiffness, and higher-order modes are not easily generated on the surface of the composite diaphragm, avoiding excessive peaks and valleys in the frequency response of the passive diaphragm. The mass of the mass element 621 and the frequency response of the composite diaphragm formed by the mass element 621 and the diaphragm may be the same or similar to the mass element (e.g., the mass element 421) and the resonant assembly (e.g., the resonant assembly 420) in other embodiments of the present application, and will not be elaborated here.

[0091] In some embodiments, the composite structure may include, but is not limited to, one or a combination of a paper cone, an aluminum sheet, or a copper sheet. In some embodiments, the composite structure may be made of the same material. For example, the composite structure may be a paper cone or an aluminum sheet. In some embodiments, the composite structure may be made of different materials. For example, the composite structure may be a structure formed by combining a paper cone and a copper sheet. Another example is that the composite structure may be a structure formed by mixing aluminum or copper in a certain proportion.

[0092] In some embodiments, the connection method between the composite structure and the diaphragm may include, but is not limited to, bonding and fixing with glue, welding, clamping, riveting, threaded connection (screws, bolts, studs, bolts, etc.), interference connection, clamp connection, pin connection, key connection, and forming connection.

[0093] It can be understood that when the diaphragm vibrates, it will cause the air in the vibration housing 613 to vibrate, thereby generating sound. Therefore, in some embodiments, at least one sound outlet hole 640 may be provided on the vibration housing 613 to lead out the sound generated by the vibration of the diaphragm outside the vibration housing 613, and at least part of the led-out sound can be perceived by the human ear. This part of the sound can enhance the response of the bone conduction speaker 600 in the low-frequency range, enabling the bone conduction speaker 600 to maintain a certain volume even when the low-frequency vibration feeling becomes weak.

[0094] In some embodiments, at least one sound outlet hole 640 may be opened at any position of the vibrating housing 613. In some embodiments, at least one sound outlet hole 640 may be opened on the side of the vibrating housing 613 facing away from the user's face, that is, on the housing back plate 6133. In some embodiments, at least one sound outlet hole 640 may also be opened on the housing side plate 6132, for example, at a position on the housing side plate 6132 facing the user's ear canal. In other embodiments, at least one sound outlet hole 640 may also be opened at a corner of the vibrating housing 613, for example, at the connection between the housing side plate 6132 and the housing back plate 6133. In some embodiments, the number of sound outlet holes 640 may be multiple. The multiple sound outlet holes 640 may be opened at different positions. For example, a part of the multiple sound outlet holes 640 may be opened on the housing back plate 6133, and another part may be opened on the housing side plate 6132. In some embodiments, at least a part of the sound derived through at least one sound outlet hole 640 may be guided to the user's ear, improving the low-frequency response of the bone conduction speaker 600. In some embodiments, the above object may be achieved by setting at least one sound outlet hole 640 at a position facing the human ear. For example, when the user wears the bone conduction speaker 600, the housing side plate 6132 faces the human ear, so at least one sound outlet hole 640 may be set on the housing side plate 6132, and the sound is derived through the sound outlet hole 640 and at least a part of it may be guided to the human ear. In some embodiments, an additional sound guiding structure may be provided to achieve the above object. For example, a sound duct may be provided at the outlet of at least one sound outlet hole 640, and the sound is guided to the human ear direction through the sound duct.

[0095] In some embodiments, the cross-sectional shape of the sound outlet hole 640 may include but is not limited to a circle, a square, a triangle, a polygon, etc.

[0096] In some embodiments, the bone conduction speaker 600 may further include a fixing component 630, and the fixing component 630 may be fixedly connected to the vibrating housing 613. The fixing component 630 may be used to maintain stable contact between the bone conduction speaker 600 and the user's (e.g., the wearer's) face, avoid the shaking of the bone conduction speaker 600, and ensure that the bone conduction speaker 600 stably transmits sound.

[0097] In some embodiments, when the stiffness of the fixing component 630 is smaller (i.e., the stiffness coefficient is smaller), the low-frequency response of the bone conduction speaker 600 at the first resonance peak 450 is more obvious (i.e., the vibration acceleration is large and the sensitivity is high), which is more conducive to improving the sound quality of the bone conduction speaker 600. On the other hand, when the stiffness of the fixing component 630 is small (i.e., the stiffness coefficient is small), it is beneficial to the vibration of the vibrating housing 613.

[0098] In some embodiments, the fixing component 630 can be directly fixedly connected to the vibration housing 613. In some embodiments, the fixing component 630 and the vibration housing 613 can be connected through a connecting component. In some embodiments, the fixing component 630 can include a fixing connecting piece. The fixing connecting piece can connect the fixing component 630 and the vibration housing 613. In some embodiments, the fixing connecting piece can be one or a combination of several of silicone, sponge, plastic, spring, and carbon sheet.

[0099] In some embodiments, the fixing component 630 can be in the form of an earhook. Two ends of the fixing component 630 are respectively connected to a vibration housing 613, and the two vibration housings 613 are respectively fixed on both sides of the human skull in the form of an earhook. In some embodiments, the fixing component 630 can be a single-ear clip. The fixing component 630 can be separately connected to a vibration housing 613 and fix the vibration housing 613 on one side of the human skull. The structure of the fixing component 630 can be the same as or similar to the fixing components in other embodiments of the present application (for example, the fixing component 230), which will not be elaborated here.

[0100] Figure 7 is a longitudinal cross-sectional schematic diagram of another bone conduction speaker shown in some embodiments of the present application. As Figure 7 shown, the bone conduction speaker 700 can include a vibration component 710 and a resonance component 720. The vibration component 710 can include a vibration element 711, a vibration housing 713, and a second elastic element 715. The second elastic element 715 is used to elastically connect the vibration element 711 and the vibration housing 713 and transmit the mechanical vibration of the vibration element 711 to the vibration housing 713. In some embodiments, the vibration element 711, the vibration housing 713, and the second elastic element 715 are respectively the same as or similar to the vibration element 211, the vibration housing 213, and the second elastic element 215 in the bone conduction speaker 200, and the details of their structures will not be elaborated here.

[0101] The resonance component 720 can include a mass element 721 and a first elastic element 723. The mass element 721 can be elastically connected to the vibration housing 713 through the first elastic element 723. As Figure 7 described, the resonance component 720 can be disposed outside the vibration housing 713. The resonance component 720 can be connected to the outer wall of the vibration housing 713 through the first elastic element 723. When the vibration housing 713 undergoes mechanical vibration, the resonance component 720 can absorb a part of the mechanical energy of the vibration housing 713, thereby weakening the vibration amplitude of the vibration housing 713.

[0102] In some embodiments, the mass element 721 can be set in different shapes. For example, a cube, an approximate cube (for example, the eight corners of the cube become arc-shaped), or an ellipsoid, etc.

[0103] In some embodiments, the mass element 721 may be a groove member. The groove member may at least partially accommodate the vibration housing 713. In some embodiments, the cross-sectional shape of the groove of the groove member may be circular, square, polygonal, or the like. In some embodiments, the cross-sectional shape of the groove of the groove member may match the outer contour of the vibration housing 713. For example, if the outer contour of the vibration housing 713 is a cuboid, the cross-sectional shape of the groove of the groove member may be a corresponding square. In some embodiments, the vibration housing 713 may be completely accommodated in the groove of the groove member. In some embodiments, the vibration housing 713 may be partially accommodated in the groove of the groove member. For example, the housing panel 7131 of the vibration housing 713 and at least a part of the housing side plate 7132 may be located outside the groove to facilitate the contact between the housing panel 7131 and the human skull and the transmission of vibration. In some embodiments, the first elastic element 723 may connect the housing back plate 7133 to the inner wall of the groove member. For example, the first part of the first elastic element 723 is connected to the housing back plate 7133, and the second part of the first elastic element 723 is connected to the inner side wall of the groove member. Assuming that the first elastic element 723 has an annular structure, the first part of the first elastic element 723 may be located in the central region of the annular structure, while the second part may be located on the periphery of the annular structure. In some embodiments, the first part of the first elastic element 723 may be connected to the housing back plate 7133, and the second part of the first elastic element 723 may be connected to the bottom plate of the groove member. In some embodiments, the first part of the first elastic element 723 may be connected to the housing side plate 7132, while the second part of the first elastic element 723 may be connected to the side plate of the groove member. In some embodiments, the vibration housing may only include the housing panel 7121 and the housing side plate 7132, without the housing back plate 7133. In this case, the resonance assembly 720 may be connected to the housing side plate 7132 or the inner wall of the vibration housing 713 through the first elastic element 723.

[0104] In some embodiments, the first elastic element 723 may be directly connected to the housing back plate 7133 and the groove member. In some embodiments, the first elastic element 723 may be connected to the housing back plate 7133 and the groove member through a connecting member. For example, a third connecting member may be fixedly provided on the housing back plate 7133, and the first part of the first elastic element 723 may be fixedly connected to the third connecting member. A fourth connecting member may be fixedly provided on the groove member, and the second part of the first elastic element 723 may be fixedly connected to the fourth connecting member. In some embodiments, the mass of the mass element 721 and the frequency response of the resonance assembly 720 formed by the mass element 721 and the first elastic element 723 may be the same or similar to those of the mass element (e.g., the mass element 421) and the resonance assembly (e.g., the resonance assembly 420) in other embodiments of the present application, which will not be elaborated herein.

[0105] In some embodiments, the internal dimension of the groove member may be greater than the external dimension of the vibration housing 713. At this time, a cavity may be formed between the vibration housing 713 and the groove member. When the vibration housing 713 and the groove member vibrate, they can drive the air in the cavity to vibrate and generate sound. At the same time, an acoustic channel 740 may be formed between the groove member and the outer wall of the vibration housing 713. For example, in Figure 7 the embodiment shown, there is a gap between the side wall of the groove member and the housing side plate 7132, and this gap can serve as the acoustic channel 740. The sound generated by the air vibration between the vibration housing 713 and the groove member can be transmitted to the outside through this acoustic channel 740, and the human ear can partially receive this sound, which to a certain extent enhances the low frequency and increases the volume.

[0106] In some embodiments, the bone conduction speaker 700 may further include a fixing component 730. The fixing component 730 can be used to keep the bone conduction speaker 700 in contact with the user's facial skull. In some embodiments, the fixing component 730 may be fixedly connected to the resonance component 720. For example, the fixing component 730 may be fixedly connected or integrally formed with the mass element 721 (e.g., the groove member). In some embodiments, the fixing component 730 may be directly fixedly connected to the groove member. In some embodiments, the fixing component 730 may also be connected to the groove member through a fixing connector.

[0107] In some embodiments, the fixing component 730 may be in the form of an earhook. Both ends of the fixing component 730 are respectively connected to a groove member and a vibration housing 713 accommodated in the groove member, and the two groove members are respectively fixed on both sides of the skull in the form of an earhook. In some embodiments, the fixing component 730 may be a single-ear clip. The fixing component 730 can be separately connected to a groove member and a vibration housing 713 accommodated in the groove member, and fix the groove member on one side of the human skull. The structure of the fixing component 730 may be the same as or similar to the fixing components in other embodiments of the present application (e.g., the fixing component 230), and will not be elaborated here.

[0108] Figure 8 and Figure 9 are a longitudinal cross-sectional schematic diagram of another bone conduction speaker according to some embodiments of the present application. As Figure 8 and Figure 9 shown, the bone conduction speaker 800 may include a vibration component 810 and a resonance component 820. The vibration component 810 may include a vibration element 811, a vibration housing 813, and a second elastic element 815 (as Figure 9 shown). The second elastic element 815 is used to elastically connect the vibration element 811 and the vibration housing 813.

[0109] The vibrating housing 813 can be a separate plate-like or plate-like structure. Different from Figure 7 the embodiment shown, the vibrating housing 813 does not define a receiving space, and the vibrating element and the second elastic element 815 are directly connected to the vibrating housing 813. The mass element 821 can be a groove member, and the mass element 821 can define a receiving space, and at least a part of the vibrating assembly 810 can be received in the space formed by the mass element 821. The first elastic element 823 can connect the mass element 821 and the vibrating housing 813.

[0110] The vibrating element 811 can include a magnetic circuit assembly. A coil is provided on the vibrating housing 813, and a magnetic circuit assembly is disposed around the coil, and the second elastic element 815 connects the magnetic circuit assembly and the vibrating housing 813.

[0111] The second elastic element 815 can be a vibration transmission sheet. In some embodiments, the vibration transmission sheet can be an annular structure. As Figure 9 shown, the annular vibration transmission sheet is disposed around the vibrating housing 813, the peripheral side of the annular vibration transmission sheet is connected to the magnetic circuit assembly, and the middle part of the annular vibration transmission sheet is connected to the vibrating housing 813. When mechanical vibration occurs under the action of the Ampere force, the vibrating housing 813 can transmit the vibration to the mass element 821 through the first elastic element 823, thereby causing the mass element 821 to vibrate, and finally achieving the effect of reducing the vibration amplitude of the vibrating assembly 810.

[0112] In some embodiments, the vibrating element 811, the vibrating housing 813, and the second elastic element 815 are the same as or similar to the vibrating element 211, the vibrating housing 213, and the second elastic element 215 in the bone conduction speaker 200 respectively, and the details of the structure will not be described herein again.

[0113] The basic concepts have been described above. Obviously, for those skilled in the art, the above invention disclosure is only an example and does not constitute a limitation to this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are proposed in this application, so such modifications, improvements, and corrections still belong to the spirit and scope of the exemplary embodiments of this application.

[0114] Meanwhile, this application uses specific terms to describe the embodiments of this application. For example, "an embodiment", "one embodiment" and / or "some embodiments" mean a certain feature, structure or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that the "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more at different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures or characteristics in one or more embodiments of this application can be appropriately combined.

[0115] In addition, those skilled in the art can understand that various aspects of this application can be illustrated and described by several patentable types or situations, including any new and useful processes, machines, products or combinations of substances or any new and useful improvements to them. Accordingly, various aspects of this application can be executed entirely by hardware, can be executed entirely by software (including firmware, resident software, microcode, etc.), or can be executed by a combination of hardware and software. The above hardware or software can all be referred to as "data blocks", "modules", "engines", "units", "components" or "systems". In addition, various aspects of this application may be embodied as a computer product located in one or more computer-readable media, and the product includes computer-readable program codes.

[0116] In addition, unless clearly stated in the claims, the order of the processing elements and sequences, the use of numerical letters or the use of other names in this application are not used to limit the order of the processes and methods of this application. Although some currently considered useful embodiments of the invention are discussed through various examples in the above disclosure, it should be understood that such details only serve the purpose of illustration, and the appended claims are not limited to the disclosed embodiments. On the contrary, the claims are intended to cover all modifications and equivalent combinations that conform to the essence and scope of the embodiments of this application. For example, although the system components described above can be implemented by hardware devices, they can also be implemented only through software solutions, such as installing the described system on existing servers or mobile devices.

[0117] Similarly, it should be noted that, in order to simplify the expression of the disclosure of this application and thus help the understanding of one or more embodiments of the invention, in the previous description of the embodiments of this application, sometimes multiple features are merged into one embodiment, drawing or its description. However, this disclosure method does not mean that the features required by the subject matter of this application are more than those mentioned in the claims. In fact, the features of the embodiment are less than all the features of the single embodiment disclosed above.

[0118] In some embodiments, numbers are used to describe components and the quantity of attributes. It should be understood that such numbers used in the description of embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the said numbers are allowed to have a variation of ±20%. Accordingly, in some embodiments, the numerical data used in the specification and claims are approximate values, and these approximate values may change according to the characteristics required by individual embodiments. In some embodiments, the numerical data should consider the specified significant digits and adopt the method of retaining the general number of digits. Although the numerical ranges and data used in some embodiments of the present application to confirm the breadth of their scope are approximate values, in specific embodiments, the setting of such numerical values is as precise as possible within the feasible range.

[0119] Finally, it should be understood that the embodiments described in the present application are only used to illustrate the principles of the embodiments of the present application. Other variations may also fall within the scope of the present application. Therefore, by way of example and not limitation, alternative configurations of the embodiments of the present application may be considered to be consistent with the teachings of the present application. Accordingly, the embodiments of the present application are not limited to the embodiments explicitly introduced and described in the present application.

Claims

1. A bone conduction speaker, characterized in that, Comprising: A vibration assembly, the vibration assembly includes a vibration element and a vibration housing, the vibration element is connected to the vibration housing, the vibration element is configured to convert an electrical signal into mechanical vibration, and the vibration housing is configured to contact a user's face and transmit the mechanical vibration to the user in a bone conduction manner to generate sound; and A resonance assembly, the resonance assembly includes a first elastic element and a mass element, the mass element is connected to the vibration assembly through the first elastic element, wherein, The vibration assembly causes the resonance assembly to vibrate. The frequency response curve of the bone conduction speaker has a first low-frequency resonance peak and a second low-frequency resonance peak in a frequency range less than 500 Hz. The first low-frequency resonance peak is generated by the vibration assembly, the second low-frequency resonance peak is generated by the resonance assembly, and the vibration of the resonance assembly weakens the vibration amplitude of the vibration housing.

2. The bone conduction speaker according to claim 1, wherein The ratio of the mass of the mass element to the mass of the vibration housing is in the range of 0.04 to 1.

25.

3. The bone conduction speaker according to claim 1, wherein The ratio of the mass of the mass element to the mass of the vibration housing is in the range of 0.1 to 0.

6.

4. The bone conduction speaker according to claim 1, wherein The vibration assembly generates a first low-frequency resonance peak at a first frequency, the resonance assembly generates a second low-frequency resonance peak at a second frequency, and the ratio of the second frequency to the first frequency is in the range of 0.5 to 2.

5. The bone conduction speaker according to claim 4, wherein The ratio of the second frequency to the first frequency is in the range of 0.9 to 1.

1.

6. The bone conduction speaker according to claim 5, wherein In a frequency range less than the first frequency, the vibration amplitude of the resonance assembly is greater than the vibration amplitude of the vibration housing.

7. The bone conduction speaker according to claim 1, wherein, The vibration assembly further includes a second elastic element, wherein, The vibration housing houses the vibration element and the second elastic element, and the vibration element transmits the mechanical vibration to the vibration housing through the second elastic element.

8. The bone conduction speaker according to claim 7, wherein, The second elastic element is a vibration transmission sheet, and the vibration transmission sheet is fixedly connected to the vibration housing.

9. The bone conduction loudspeaker according to claim 1, wherein, The first elastic element is fixedly connected to the vibration housing, and the vibration housing transmits the mechanical vibration to the mass element through the first elastic element.

10. The bone conduction speaker according to claim 9, wherein, The resonance assembly is housed in the vibration housing, and the resonance assembly is connected to the inner wall of the vibration housing through the first elastic element.

11. The bone conduction speaker according to claim 10, characterized in that, The first elastic element includes a diaphragm, and the mass element includes a composite structure attached to the surface of the diaphragm.

12. The bone conduction speaker according to claim 11, wherein, The composite structure includes a paper cone, an aluminum sheet or a copper sheet.

13. The bone conduction speaker according to claim 10, characterized in that, At least one sound outlet hole is formed in the vibration housing, and the sound generated by the vibration of the resonance assembly is led out to the outside through the at least one sound outlet hole.

14. The bone conduction speaker according to claim 13, wherein, The at least one sound outlet hole is formed on a side of the vibration housing facing away from the user's face.

15. The bone conduction speaker according to claim 9, characterized in that, The bone conduction speaker further includes a fixing assembly, the fixing assembly is configured to maintain stable contact between the bone conduction speaker and the user, and the fixing assembly is fixedly connected to the vibration housing.

16. The bone conduction loudspeaker according to claim 9, wherein, The resonance assembly is located outside the vibration housing, and the resonance assembly is connected to the outer wall of the vibration housing through the first elastic element.

17. The bone conduction speaker according to claim 15, wherein The mass element is a groove member, at least part of the vibration housing is received in the groove member, the first elastic element connects the outer wall of the vibration housing and the inner wall of the groove member, and a sound outlet channel is formed between the inner wall of the groove member and the outer wall of the vibration housing.

18. The bone conduction speaker according to claim 15, wherein The bone conduction speaker further includes a fixing assembly for maintaining contact between the bone conduction speaker and the user's face, and the fixing assembly is fixedly connected to the resonance assembly.

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