Bone conduction loudspeakers and bone conduction earphones

Abstract

Bone conduction loudspeaker, characterized in that it comprises a panel and a drive unit, wherein the drive device is used to generate a driving force, wherein the panel is connected to the drive unit in a drive-related manner, wherein the panel is used wholly or partially for contact with or attachment to the body of a user in order to conduct sound, wherein an area on the panel used for contact with or attachment to the user's body has a normal, wherein a straight line on which the driving force is located is not parallel to the normal, wherein the area on the panel used for contact with or attachment to the user's body is a plane or a quasi-plane, wherein, if the area on the panel used for contact with or attachment to the user's body is a quasi-plane, a quasi-plane normal serves as an average quasi-plane normal, wherein the average normal is: r 0 ^ = ∯ sr ^ ds | ∯ sr ^ ds | where r 0 ^ where represents the average normal, r̂ represents a normal of any point in the surface, and ds represents a surface element, and where the angle between a normal of any point in at least 50% of the quasi-plane and its average normal is smaller than a set threshold value that is less than 10°.

Description

CROSS-REFERENCE

[0001] The present invention claims priority from the Chinese application filed on June 15, 2018, with application number 201810623408.2, the contents of which are incorporated herein by reference. TECHNICAL AREA

[0002] The present invention relates to a bone conduction loudspeaker, in particular a method for improving the sound quality of a bone conduction loudspeaker or a bone conduction earphone. STATE OF THE ART

[0003] Generally, sound is heard when air vibrations travel through the outer ear canal to the eardrum. These vibrations, generated by the eardrum, drive the auditory nerves, allowing the sound waves to be perceived. In a bone conduction speaker, these vibrations are typically transmitted through the skin, subcutaneous tissue, and bones to the auditory nerves, enabling sound perception. REVELATION OF THE INVENTION

[0004] In one embodiment of the present invention, a bone conduction loudspeaker is provided comprising a panel and a drive unit, wherein the drive unit is used to generate a driving force, wherein the panel is drivenly connected to the drive unit, wherein the panel is used wholly or partially for contact with or attachment to the body of a user in order to conduct sound, wherein an area on the panel used for contact with or attachment to the body of the user has a normal, and wherein a straight line on which the driving force is located is not parallel to the normal.

[0005] In some embodiments, the system is arranged such that the straight line on which the driving force is located has a positive direction extending beyond the panel from the bone conduction loudspeaker, and the normal has a positive direction extending away from the bone conduction loudspeaker, so that an angle between the two straight lines in their positive directions is formed as an acute angle.

[0006] In some embodiments, the drive device comprises a coil and a magnetic circuit system, wherein the axes of the coil and the magnetic circuit system are not parallel to the normal, and wherein the axes are perpendicular to a radial plane of the coil and / or a radial plane of the magnetic circuit system.

[0007] In some embodiments, an outer housing is further included, wherein a connecting medium exists between the outer housing and the panel, or wherein the outer housing is formed integrally with the panel.

[0008] In some embodiments, the coil is connected to the panel and / or the outer housing via a first transmission path, and the magnetic circuit system is connected to the panel and / or the outer housing via a second transmission path.

[0009] In some embodiments, the first transmission path comprises a connecting part and the second transmission path a vibration transmitter, wherein the stiffness of the connecting part is higher than the stiffness of the vibration transmitter.

[0010] In some embodiments, the stiffness of a particular arrangement on the first transmission path or the second transmission path is positively correlated with the modulus of elasticity or the thickness of the component and negatively correlated with the surface area of ​​the component.

[0011] In some embodiments, the connecting part is provided with reinforcing ribs.

[0012] In some embodiments, the reinforcing ribs are provided to be vertical surfaces or struts.

[0013] In some embodiments, the connecting part is a hollow cylinder, with one end face of the hollow cylinder being connected to an end face of the coil and the other end face of the cylinder being connected to the panel and / or the outer housing.

[0014] In some embodiments, the connecting part is provided to be a group of connecting rods, wherein one end of each of the connecting rods is connected to an end face of the coil and the other end of each of the connecting rods is connected to the panel and / or the outer housing, and wherein each of the connecting rods is distributed circumferentially around the circumference of the coil.

[0015] In some embodiments, the driving force is provided to have a component in a first quadrant and / or a third quadrant of a two-dimensional xoy coordinate system, wherein an origin o of the two-dimensional xoy coordinate system is located in a contact surface of the bone conduction loudspeaker with the human body, wherein an x-axis is parallel to the coronal axis of the human body and a y-axis is parallel to the sagittal axis of the human body, and wherein a positive direction of the x-axis is directed outwards from the human body and a positive direction of the y-axis is directed forwards from the human body.

[0016] In some embodiments, at least two drive devices are provided, wherein a straight line on which a resultant force from the drive forces generated by the respective drive devices is located does not run parallel to the normal.

[0017] In some embodiments, it is provided that a straight line on which a first driving force generated by a first driving device is located runs parallel to the normal, and that a straight line on which a second driving force generated by a second driving device is located runs perpendicular to the normal.

[0018] In some embodiments, the surface area of ​​the panel is provided to be in the range of 20 mm. 2 up to 1000 mm 2 lies.

[0019] In some embodiments, the lengths of the panel's side lengths are provided to be in the range of 5 mm to 40 mm, 18 mm to 25 mm, and 11 mm to 18 mm, respectively.

[0020] In some embodiments, the angle between the straight line on which the driving force is located and the normal is provided for as any value between 5° and 80°, or any value between 15° and 70°, or any value between 25° and 50°, or any value between 25° and 40°, or any value between 28° and 35°, or any value between 27° and 32°, or any value between 30° and 35°, or any value between 25° and 60°, or any value between 28° and 50°, or any value between 30° and 39°, or any value between 31° and 38°, or any value between 32° and 37°, or any value between 33° and 36°, or any value between 33° and 35.8° and / or any value between 33.5° and 35°.

[0021] In some embodiments, the angle between the straight line on which the driving force is located and the normal is 26°±0.2, 27°±0.2, 28°±0.2, 29°±0.2, 30°±0.2, 31°±0.2, 32°±0.2, 33°±0.2, 34°±0.2, 34.2°±0.2, 35°±0.2, 35.8°±0.2, 36°±0.2, 37°±0.2 or 38°±0.2.

[0022] In some embodiments, the area on the panel used for contact with or attachment to the user's body is provided to be a plane.

[0023] In some embodiments, the area on the panel used for contact with or attachment to the user's body is provided to be a quasi-plane, and the normal of the area of ​​the panel is an average normal when the area is a quasi-plane. where the following applies to the average normal: r0^=∯sr^ ds|∯sr^ ds|, where r0^ r̂ represents the average normal, r̂ represents a normal to any point in the surface, and ds represents a surface element. and where the quasi-plane is a surface in which the angle between a normal of any point and its average normal is smaller than a set threshold.

[0024] In some embodiments, the set threshold is provided to be less than 10°.

[0025] In an embodiment of the present application, another bone conduction loudspeaker is provided, comprising a panel and a drive unit, wherein the panel is connected to the drive unit in a drive-related manner, wherein the panel is used wholly or partially for contact with or attachment to the body of a user in order to conduct sound, wherein an area on the panel used for contact with or attachment to the body of the user has a normal, wherein an axis of the drive unit is not parallel to the normal, wherein the drive unit comprises a coil and a magnetic circuit system, and wherein an axis of the drive unit is perpendicular to a radial plane of the coil and / or a radial plane of the magnetic circuit system.

[0026] In some embodiments, an outer housing is further included, wherein a connecting medium exists between the outer housing and the panel, or wherein the outer housing is formed integrally with the panel.

[0027] In some embodiments, the coil is connected to the panel and / or the outer housing via a connecting part.

[0028] In some embodiments, the connecting part is provided with reinforcing ribs.

[0029] In some embodiments, the reinforcing ribs are provided to be vertical surfaces or struts.

[0030] In some embodiments, one side of the connecting part is provided to be shorter than the other side, so that one axis of the coil is not parallel to the normal.

[0031] In some embodiments, the connecting part is a hollow cylinder, with one end face of the hollow cylinder being connected to an end face of the coil and the other end face of the cylinder being connected to the panel and / or the outer housing.

[0032] In some embodiments, the connecting part is provided to be a group of connecting rods, wherein one end of each of the connecting rods is connected to an end face of the coil and the other end of each of the connecting rods is connected to the panel and / or the outer housing, and wherein each of the connecting rods is distributed circumferentially around the circumference of the coil.

[0033] In some embodiments, the area on the panel used for contact with or attachment to the user's body is provided to be a plane.

[0034] In some embodiments, the area on the panel used for contact with or attachment to the user's body is provided to be a quasi-plane, and the normal of the area of ​​the panel is an average normal when the area is a quasi-plane. where the following applies to the average normal: r0^=∯sr^ ds|∯sr^ ds|, where r0^ r̂ represents the average normal, r̂ represents a normal to any point in the surface, and ds represents a surface element. and where the quasi-plane is a surface in which the angle between a normal of any point and its average normal is smaller than a set threshold.

[0035] In some embodiments, the set threshold is provided to be less than 10°.

[0036] In some embodiments, the surface area of ​​the panel is provided to be in the range of 20 mm. 2 up to 1000 mm 2 lies.

[0037] In some embodiments, the lengths of the panel's side lengths are provided to be in the range of 5 mm to 40 mm, 18 mm to 25 mm, and 11 mm to 18 mm, respectively.

[0038] In some embodiments, it is provided that the axis of the drive device has a positive direction extending beyond the panel of the bone conduction loudspeaker, and the normal has a positive direction extending away from the bone conduction loudspeaker, so that an angle between the two straight lines in their positive directions is formed as an acute angle.

[0039] In some embodiments, the angle between the straight line on which the driving force is located and the normal is any value between 5° and 80°, or any value between 15° and 70°, or any value between 25° and 50°, or any value between 25° and 40°, or any value between 28° and 35°, or any value between 27° and 32°; or that the angle is any value between 30° and 35°, or any value between 25° and 60°, or any value between 28° and 50°, or any value between 30° and 39°, or any value between 31° and 38°, or any value between 32° and 37°, or any value between 33° and 36°, or any value between 33° and 35.8°, or any value between 33.5° and 35°.

[0040] In some embodiments, the angle between the straight line on which the driving force is located and the normal is 26°±0.2, 27°±0.2, 28°±0.2, 29°±0.2, 30°±0.2, 31°±0.2, 32°±0.2, 33°±0.2, 34°±0.2, 34.2°±0.2, 35°±0.2, 35.8°±0.2, 36°±0.2, 37°±0.2 or 38°±0.2.

[0041] In yet another embodiment of the present invention, a different bone conduction loudspeaker is provided, comprising a panel and at least two drive units, wherein the panel is connected to the two drive units in a drive-like manner, wherein the panel is used wholly or partially for contact with or attachment to the body of a user in order to conduct sound, wherein an area on the panel used for contact with or attachment to the body of the user has a normal, wherein an axis of a first drive unit is parallel to the normal and an axis of a second drive unit is perpendicular to the normal, wherein the drive units comprise coils and magnetic circuit systems, and wherein axes of the drive units are perpendicular to radial planes of the coils and / or radial planes of the magnetic circuit systems.

[0042] In some embodiments, the area on the panel used for contact with or attachment to the user's body is provided to be a plane.

[0043] In some embodiments, the area on the panel used for contact with or attachment to the user's body is provided to be a quasi-plane, and the normal of the area of ​​the panel is an average normal when the area is a quasi-plane. where the following applies to the average normal: r0^=∯sr^ ds|∯sr^ ds|, where r0^ r̂ represents the average normal, r̂ represents a normal to any point in the surface, and ds represents a surface element. and where the quasi-plane is a surface in which the angle between a normal of any point and its average normal is smaller than a set threshold.

[0044] In some embodiments, the set threshold is provided to be less than 10°.

[0045] In one embodiment of the present invention, a bone conduction earphone is provided which comprises a bone conduction loudspeaker according to one of the present embodiments.

[0046] In one embodiment of the present invention, a method for adjusting a bone conduction loudspeaker is provided, comprising: connecting a panel to a drive unit, wherein the panel is used wholly or partially for contact with or attachment to the body of a user to conduct sound, and wherein an area on the panel used for contact with or attachment to the body of the user has a normal; and adjusting a position of the drive unit relative to the panel such that a straight line on which a driving force generated by the drive unit is located is not parallel to the normal.

[0047] In some embodiments, the position of the drive unit is adjusted relative to the panel such that the drive force has a component in a first quadrant and / or a third quadrant of a two-dimensional xoy coordinate system, wherein an origin o of the two-dimensional xoy coordinate system is located in a contact surface of the bone conduction loudspeaker with the human body, wherein an x-axis is parallel to the coronal axis of the human body and a y-axis is parallel to the sagittal axis of the human body, and wherein a positive direction of the x-axis is directed outwards from the human body and a positive direction of the y-axis is directed forwards from the human body.

[0048] In some embodiments, at least two drive devices are provided, and the positions of the respective drive devices are adjusted relative to the panel so that a straight line on which a resultant force from the drive forces generated by the respective drive devices lies is not parallel to the normal.

[0049] In some embodiments, the area on the panel used for contact with or attachment to the user's body is provided to be a plane.

[0050] In some embodiments, the area on the panel used for contact with or attachment to the user's body is provided to be a quasi-plane, and the normal of the area of ​​the panel is an average normal when the area is a quasi-plane. where the following applies to the average normal: r0^=∯sr^ ds|∯sr^ ds|, where r0^ r̂ represents the average normal, r̂ represents a normal to any point in the surface, and ds represents a surface element. and where the quasi-plane is a surface in which the angle between a normal of any point and its average normal is smaller than a set threshold.

[0051] In some embodiments, the set threshold is provided to be less than 10°. BRIEF DESCRIPTION OF THE FIGURES

[0052] The present invention is further described according to exemplary embodiments. These exemplary embodiments are described in more detail with reference to the figures. The exemplary embodiments are non-limiting examples, wherein similar reference numerals in at least two views of the figures represent similar structures. In the figures: Fig. Figure 1 shows an application scenario or a schematic structural representation of a bone conduction loudspeaker according to the present invention; Fig. Figure 2 shows a schematic representation in one direction at an angle according to the present invention; Fig. Figure 3 shows a schematic structural representation of the effect of the bone conduction loudspeaker on the skin or bones of the human body according to the present invention; Fig. Figure 4 shows a diagram of an angle as a function of a relative displacement of the bone conduction loudspeaker according to the present invention; Fig. Figure 5 shows a diagram of a frequency response curve of the bone conduction loudspeaker according to the present invention; Fig. Figure 6 shows a schematic diagram in a low frequency band of the frequency response curve of the bone conduction loudspeaker at different angles θ according to the present invention; Fig. Figure 7 shows a schematic diagram in a high frequency band of the frequency response curve of the bone conduction loudspeaker with a panel or an outer housing made of different materials according to the present invention; Fig. Figure 8 shows a schematic, axially sectioned structural representation of the bone conduction loudspeaker according to a first embodiment of the present invention; Fig. Figure 9A shows a schematic, axially sectioned structural representation of the bone conduction loudspeaker according to a second embodiment of the present invention; Fig. Figure 9B shows a schematic exploded structural representation of components of the bone conduction loudspeaker according to a product example of the second embodiment of the present invention; Fig. Figure 9C shows a schematic, longitudinally sectioned structural representation of the bone conduction loudspeaker according to Fig. 9B; Fig. 9D and Fig. Figures 9E each show a schematic structural representation of a carrier of the bone conduction loudspeaker according to some specific embodiments of the present invention; Fig. Figure 10 shows a schematic, axially sectioned structural representation of the bone conduction loudspeaker according to a third embodiment of the present invention; Fig. Figure 11 shows a schematic, axially sectioned structural representation of the bone conduction loudspeaker according to a fourth embodiment of the present invention; Fig. Figure 12 shows a schematic, axially sectioned structural representation of the bone conduction loudspeaker according to a fifth embodiment of the present invention; Fig. Figure 13 shows a schematic, axially sectioned structural representation of the bone conduction loudspeaker according to a sixth embodiment of the present invention; Fig. Figure 14 shows a schematic, axially sectioned structural representation of the bone conduction loudspeaker according to a seventh embodiment of the present invention; Fig. Figure 15 shows a schematic, axially sectioned structural representation of the bone conduction loudspeaker according to an eighth embodiment of the present invention; and Fig. Figure 16 shows a schematic, axially sectioned structural representation of the bone conduction loudspeaker according to a ninth embodiment of the present invention; and Fig. Figure 17 shows a flowchart of a method for adjusting the bone conduction loudspeaker according to the present invention. Detailed descriptions

[0053] To more clearly explain the technical solutions in the embodiments of the present invention, the drawings required for describing these embodiments are briefly presented below. Obviously, the drawings in the following description represent only some embodiments of the present invention and do not limit its scope. A person skilled in the art in this field could apply the present invention in other similar situations based on these drawings without inventive step.

[0054] As shown in the present description and in the claims, the terms "a" and / or "the" need not necessarily refer to the singular form, but may also include the plural form unless clearly indicated otherwise in the context. In general, the terms "comprise" and "contain" only indicate that the specifically identified steps and elements are included, that these steps and elements do not constitute an exclusive list, and that further steps or elements may be included in the method or apparatus. The term "based on" refers to "at least partially based on." The term "an embodiment" refers to "at least one embodiment." The term "another embodiment" refers to "at least one other embodiment." Respective definitions of other terms are given in the following description.

[0055] The relevant bone conduction technologies in the present invention are described below by referring to a "bone conduction loudspeaker" or a "bone conduction earphone," without loss of generality. This description represents only one implementation for bone conduction applications. For those skilled in the art, "loudspeaker" or "earphone" may also be replaced by other similar terms, such as "player," "hearing aid," etc. In fact, the implementations in the present invention can advantageously be applied to hearing aids other than loudspeakers.For experts in this field, understanding the basic principle of bone conduction allows them to implement various modifications and changes to the bone conduction speaker, including its design and details, without deviating from this fundamental principle. In particular, a function for ambient sound pickup and processing is added to the bone conduction speaker, enabling it to function as a hearing aid. For example, a sound source such as a microphone can pick up sound from the user's / wearer's environment. Using specific algorithms, the processed sound (or a generated electrical signal) can then be transmitted to the bone conduction speaker.This means that the bone conduction speaker can certainly be modified, a function for capturing ambient sound is added, and after some signal processing, sound is transmitted through the bone conduction speaker to the user / wearer to fulfill the function of a bone conduction hearing aid. Examples of algorithms mentioned here can include a combination of one or more of the following: noise reduction, automatic gain control, acoustic feedback suppression, wide dynamic range compression, active ambient sensing, active noise reduction, directional processing, tinnitus treatment, multi-channel wide dynamic range compression, active sibilance reduction, volume control, etc.

[0056] The bone conduction loudspeaker transmits sound through bone to the auditory system to create the sensation of hearing. Typically, the bone conduction loudspeaker generates and transmits sound primarily through the following steps: in step 1, the bone conduction loudspeaker detects or generates a signal containing sound information, such as an electrical and / or voltage signal with audio information; in step 2, a drive unit of the bone conduction loudspeaker (also called an energy converter) generates vibrations based on the signal; and in step 3, the vibrations are transmitted by a transmission mechanism to the panel or outer casing of the loudspeaker.

[0057] In step 1, the bone conduction speaker can, in particular, detect or generate a signal containing sound information in various ways. This sound information can be either video or audio files in specific file formats, or data or files that are typically portable and can ultimately be converted into sound in a specific manner. The signal containing sound information can originate either from a storage unit within the bone conduction speaker itself or from a system other than the bone conduction speaker for generating, storing, or transmitting information. The sound signal discussed here is not limited to an electrical signal; it can also be a signal other than an electrical one, such as an optical signal, a magnetic signal, a mechanical signal, etc.In principle, any signal can be processed as an audio signal as long as it contains sound information that the loudspeaker can use to generate vibrations. The audio signal is not limited to a single signal source; it can originate from multiple sources. These multiple signal sources can be either interdependent or independent. The transmission or generation of the audio signal can be wired or wireless, and this can occur in real time or with a delay. For example, a bone conduction loudspeaker can not only receive an electrical signal containing sound information via a wired or wireless connection, but it can also directly acquire data from a storage medium to generate an audio signal.In some embodiments, it is provided that a sound detection function can be added to the bone conduction hearing aid, which can achieve a noise reduction effect by capturing ambient sound and processing the received sound signal. A wired connection refers to the use of, but is not limited to, the following: metallic cable, optical cable, or hybrid cable consisting of metallic and optical cable, such as coaxial cable, communication cable, soft cable, coiled cable, non-metallic sheathed cable, metallic sheathed cable, multi-core cable, twisted-pair cable, ribbon cable, shielded cable, telecommunications cable, two-wire cable, double-core parallel cable, and twisted-pair wire.

[0058] The examples described above are for illustrative purposes only. A medium for a wired connection can also be of a different type, such as other transmission carriers for electrical or optical signals, etc. Wireless connections include, but are not limited to, radio communication, free-space optical communication, acoustic communication, and electromagnetic induction. Radio communication includes, but is not limited to: IEEE 302.11 series standards, IEEE 302.15 series standards (e.g., Bluetooth and ZigBee technologies, etc.), first-generation mobile communication technology, second-generation mobile communication technology (e.g., FDMA, TDMA, SDMA, CDMA, and SSMA, etc.), General Packet Radio Service technology, and third-generation mobile communication technology (e.g., CDMA2000, WCDMA, TD-SCDMA, and WiMAX, etc.).Fourth generation mobile communication technology (e.g., TD-LTE and FDD-LTE, etc.), satellite communication (e.g., GPS technology, etc.), near field communication (NFC), and other technologies operating in the ISM frequency band (e.g., 2.4 GHz, etc.). Optical free-space communication refers to, but is not limited to, visible light and infrared signals, etc. Acoustic communication refers to, but is not limited to, sound wave and ultrasonic wave signals, etc. Electromagnetic induction refers to, but is not limited to, near field communication technology, etc. The examples described above are for the sake of simplicity. A wireless connection medium can also be of a different type, for example, Z-Wave technology and other licensed radio frequency bands for civilian use and radio frequency bands for military purposes, etc.For example, application scenarios for the present technical solution include the ability of the bone conduction speaker not only to capture signals with sound information from another device via Bluetooth technology, but also to directly capture data from its own storage unit in order to then generate sound signals.

[0059] The storage device / storage unit mentioned here is a storage device for storage systems such as direct-attached storage, network-attached storage, and storage area networks, etc. The storage device includes various conventional types of storage devices such as, but not limited to: solid-state storage devices (solid-state hard disk drives and solid-state hybrid hard disk drives, etc.), mechanical hard disk drives, USB flash drives, memory sticks, memory cards (such as CF and SD, etc.), other drives (such as CD, DVD, HD, DVD and Blu-ray, etc.), random-access memory (RAM), and read-only memory (ROM). RAM includes, but is not limited to, the following: decimal counter tube, selection tube, delay line memory, Williams tube, dynamic random access memory (DRAM), static random access memory (SRAM), thyristor random access memory (T-RAM), and zero-capacitor random access memory (Z-RAM), etc.ROM includes, but is not limited to: magnetic bubble memory, magnetic button wire memory, thin-film memory, magnetic wire memory, magnetic core memory, magnetic drum memory, optical drive, hard disk drive, magnetic tape, early NVRAM (non-volatile memory), phase-change memory, magnetoresistive random-access memory, ferroelectric random-access memory, non-volatile SRAM, flash memory, electronically erasable programmable read-only memory, erasable programmable read-only memory, programmable read-only memory, shielded stack memory, floating-gate random-access memory, nano random-access memory, racetrack memory, variable resistance memory, and programmable metallization cells, etc. The above list is only a selection of storage devices / units; the storage devices / units that can be used are not limited to these.

[0060] Fig. Figure 1 shows an application scenario or a schematic structural representation of a bone conduction loudspeaker according to the present invention. As shown in Fig. As shown in Figure 1, the bone conduction loudspeaker comprises a drive unit 101, a transmission arrangement 102, a panel 103, an outer housing 104, and the like. The drive unit 101 transmits a vibration signal via the transmission arrangement 102 to the panel 103 and / or the outer housing 104, in order to transmit sound to the human body through contact of the panel 103 or the outer housing 104 with the skin. In some embodiments, the panel 103 and / or the outer housing 104 of the bone conduction loudspeaker can be in contact with the skin of the human body at the tragus to transmit sound to the human body. In some embodiments, the panel 103 and / or the outer housing 104 can also be in contact with the skin of the human body at the posterior aspect of the auricle.

[0061] The bone conduction speaker can convert signals containing sound information into vibrations, thereby generating sound. Energy conversion is an integral part of generating these vibrations. The bone conduction speaker can achieve this conversion of signals into mechanical vibrations through a specific drive mechanism. During this conversion, various types of energy can be present or converted simultaneously. For example, electrical signals can be directly converted into mechanical vibrations by an energy converter to produce sound. Alternatively, sound information can be contained within optical signals. The drive mechanism can then convert these optical signals into vibration signals. Another option is for the drive mechanism to first convert optical signals into electrical signals and then, in turn, convert electrical signals back into vibration signals.Other types of energy that may be present or converted during the operation of the drive unit include thermal energy and magnetic field energy, etc. The types of energy conversion used by the drive unit include, but are not limited to: moving coil, electrostatic, piezoelectric, moving iron, pneumatic, and electromagnetic, etc. The frequency response and sound quality of the bone conduction loudspeaker may be affected by different types of energy conversion and by the characteristics of individual physical arrangements within the drive unit.For example, in an energy converter with a moving coil, a wound cylindrical coil is connected to a vibration transformer. A coil driven by the signal currents in a magnetic field sets the vibration transformer into vibration to generate sound. The expansion and contraction of the material, the deformation of the folds, the size, shape, and mounting method of the vibration transformer, as well as the magnetic density of a permanent magnet, all strongly influence the final sound output and quality of the bone conduction loudspeaker. Furthermore, the vibration transformer can be, for example, a mirror-symmetrical structure, a centrally symmetrical structure, or an asymmetrical structure.The vibration transducer can be provided with spaced-apart porous structures, allowing it to generate a greater displacement, thus increasing the sensitivity of the bone conduction loudspeaker and boosting the output of vibrations and sound. Alternatively, the vibration transducer can be, for example, an annular structure with several struts converging towards the center within the ring, and two or more struts may be used.

[0062] For experts in this field, it is self-evident, based on the understanding of the fundamental principle that the sound effect and quality of a bone conduction loudspeaker can be influenced by the types of energy conversion and specific components, that it is possible to select, combine, modify, or alter the aforementioned factors to achieve ideal sound quality without deviating from this principle. For example, improved sound quality can be achieved by using permanent magnets with high magnetic density, more suitable materials, and optimized designs for the vibration plate.

[0063] The term "sound quality," as used here, can be understood as reflecting the quality of the sound and referring to the fidelity of audio reproduction after processes such as processing and transmission. Sound quality is primarily described by three factors: loudness, pitch, and timbre. Loudness refers to the subjective perception of the human ear regarding the intensity of the sound and correlates positively with the logarithmic value of the sound intensity. The higher the sound intensity, the louder and clearer the sound is perceived. Furthermore, loudness depends on the frequency and waveform of the sound. Pitch, also known as pitch, refers to the subjective perception of the human ear regarding the magnitude of the sound's vibrational frequencies. Pitch depends primarily on the fundamental frequency of the sound.The higher the fundamental frequency, the higher the pitch. It is also dependent on the sound's intensity. Timbre refers to the subjective perception of the human ear regarding the specific characteristics of a sound. Timbre is primarily determined by the structure of the sound's frequency spectrum and is also related to factors such as volume, duration, the sound generation process, and attenuation. The structure of the sound's frequency spectrum is described by the fundamental frequency, the number of harmonic frequencies, the distribution of these harmonic frequencies, the amplitude, and the phase relationships. Different frequency spectral structures result in different timbres. Even if the fundamental frequencies and volumes are the same, but the harmonic structures differ, the timbres will still vary.

[0064] As in Fig. As shown in Figure 1, in the bone conduction loudspeaker according to some specific embodiments of the present invention, the straight line B, on which the driving force generated by the drive unit 101 is located, or the direction of vibration of the drive unit, and the normal A of the panel 103 form an angle θ. In other words, the straight line B does not run parallel to the straight line A.

[0065] The panel has an area designed to contact or rest against the user's body, such as the skin. It is understood that the panel and the user's body do not make direct contact, but rather rest against each other, especially when the panel is covered with another material (for example, soft materials like silicone) to enhance user comfort. In some embodiments, all areas of the panel are designed to contact or rest against the user's body after the bone conduction speaker has been worn. In other embodiments, only partial areas of the panel are designed to contact or rest against the user's body after the bone conduction speaker has been worn.In some embodiments, an area on the panel used for contact with or against the user's body may comprise more than 50% of the panel's total surface area, preferably more than 60%. Typically, this area of ​​the panel that contacts or rests against the user's body may be a flat or curved surface.

[0066] In some embodiments, if the area on the panel used for contact with or attachment to the user's body is a plane, its normal corresponds to a general definition of a normal. In some embodiments, if the area on the panel used for contact with or attachment to the user's body is a curved surface, its normal represents an average normal of the area.

[0067] The average normal is defined as follows: r0^=∯sr^ ds|∯sr^ ds|, where r0^ r̂ represents the average normal, r̂ represents a normal to any point in the curved surface, and ds represents a surface element.

[0068] Furthermore, the curved surface is designed to be a quasi-plane that approximates a plane. This means that the angle between a normal of any point in at least 50% of the areas on the curved surface and its average normal is less than a set threshold. In some embodiments, the set threshold is less than 10°. In some embodiments, the set threshold can be even less than 5°.

[0069] In some embodiments, the straight line B, on which the driving force is located, and a normal A' of an area on the panel 103 used for contact with or against the user's body form the angle θ. The numerical range of the angle θ can be 0 < θ < 180°, and furthermore, the numerical range can be 0 < θ < 180° and not equal to 90°. In some embodiments, the straight line B is arranged such that it has a positive direction pointing outwards from the bone conduction speaker, and a normal A of the panel 103 (or a normal A' of a contact surface of the panel 103 with the skin of the human body) also has a positive direction pointing outwards from the bone conduction speaker, so that the angle θ formed by the straight line A or A' and the straight line B in their positive directions is an acute angle, i.e., 0 < θ < 90°.

[0070] Fig. Figure 2 shows a schematic representation in one direction at an angle according to the present invention. As in Fig. As shown in Figure 2, in some embodiments the driving force generated by the drive unit has a component in a first quadrant and / or a third quadrant of a two-dimensional xoy coordinate system. The two-dimensional xoy coordinate system is a reference coordinate system, its origin o being located in a contact surface of the panel and / or the outer housing with the human body after the bone conduction speaker has been worn, with an x-axis running parallel to the coronal axis of the human body and a y-axis running parallel to the sagittal axis of the human body, and with a positive direction of the x-axis pointing outwards from the human body and a positive direction of the y-axis pointing forwards from the human body.Quadrants are defined as four regions divided by a horizontal axis (such as the x-axis) and a vertical axis (such as the y-axis) in a two-dimensional Cartesian coordinate system, with each region being called a quadrant. The quadrants are centered on the origin, and the x-axis and y-axis serve as the dividing lines for this purpose.A region located in the upper right (enclosed by the positive semi-axis of the x-axis and the positive semi-axis of the y-axis) is called the first quadrant, a region located in the upper left (enclosed by the negative semi-axis of the x-axis and the positive semi-axis of the y-axis) is called the second quadrant, a region located in the lower left (enclosed by the negative semi-axis of the x-axis and the negative semi-axis of the y-axis) is called the third quadrant, and a region located in the lower right (enclosed by the positive semi-axis of the x-axis and the negative semi-axis of the y-axis) is called the fourth quadrant. Points lying on the coordinate axes do not belong to any quadrant.It is understood that in the present embodiment, the driving force may lie directly in the first quadrant and / or the third quadrant of the two-dimensional xoy coordinate system, or that the driving force may be oriented in another direction, provided that its projection or component in the first quadrant and / or the third quadrant of the two-dimensional xoy coordinate system is not zero, and that its projection or component in the direction of a z-axis may be either zero or non-zero. The z-axis is perpendicular to the xoy plane and passes through the origin o. In some specific embodiments, the minimum angle θ between the straight line on which the driving force lies and the normal of the area on the panel that contacts or rests against the user's body may be any acute angle.For example, the range of the angle θ is preferably 5° to 80°, more preferably 15° to 70°, more preferably 25° to 60°, more preferably 25° to 50°, more preferably 28° to 50°, more preferably 30° to 39°, more preferably 31° to 38°, more preferably 32° to 37°, more preferably 33° to 36°, more preferably 33° to 35.8° and more preferably 33.5° to 35°. In particular, the angle θ can be 26°, 27°, 28°, 29°, 30°, 31°, 32°, 33°, 34°, 34.2°, 35°, 35.8°, 36°, 37°, or 38°, etc., with the error being controlled to be less than 0.2 degrees. It should be noted that the above description of the direction of the driving force is not intended to be a limitation of the driving force of the present invention. In another embodiment, the driving force can also have a component in the second and fourth quadrants of the two-dimensional xoy coordinate system, or even the driving force can lie along the y-axis, etc.

[0071] Fig. Figure 3 shows a schematic structural representation of the effect of the bone conduction loudspeaker on the skin and / or bones of the human body according to the present invention. The bone conduction loudspeaker serves to receive, record, or generate signals containing sound information. The sound information is converted into acoustic vibrations by a drive unit, and the vibrations are transmitted via a transmission arrangement to the skin 320 of the human body, which is in contact with the panel or the outer housing. The vibrations are then transmitted to the bones 310 of the human body, so that the user ultimately hears sound. The subject of the aforementioned hearing system, sensory organ, or the like can be either a human being or an animal with a hearing system, without losing the generality of the invention.It should be noted that the following description of the use of the bone conduction speaker by humans does not limit the application scenarios of the bone conduction speaker. A similar description may also be suitable for other animals.

[0072] As in Fig. As shown in Figure 3, the bone conduction loudspeaker comprises a drive unit (in another embodiment it may also be called an energy converter), a transmission arrangement 303, a panel 301 and an outer housing 302.

[0073] The vibrations of Panel 301 are transmitted through the tissues and bones to the auditory nerves, enabling sound perception. Panel 301 can be in direct contact with the skin or via a vibration-transmitting layer made of a specific material. The placement of Panel 301 on the body can include positions near the tragus, the mastoid process, the back of the ear, or other locations.

[0074] The physical properties of the panel, such as its mass, size, shape, stiffness, and vibration damping, influence its vibration efficiency. Experts in this field can select a suitable material for the panel according to specific requirements, or the panel can be injection-molded into various shapes using different molds. For example, the panel can be rectangular, circular, or elliptical. Alternatively, the panel can be formed in a shape obtained by truncating the edges of a rectangle, circle, or ellipse. An example of such a shape is obtained by symmetrically truncating a circle, resembling an ellipse or a raceway, but not limited to these. More preferably, the panel can be hollowed out. As just one example, the surface area of ​​the panel can be adjusted as needed.In some specific embodiments, the surface area of ​​the panel is provided to be in the range of 20 mm. 2 up to 1000 mm 2 The panel's dimensions can vary. Specifically, the side length can range from 5 mm to 40 mm, or 18 mm to 25 mm, or 11 mm to 18 mm. For example, the panel could be a rectangle with a length of 22 mm and a width of 14 mm. Alternatively, the panel could be an ellipse with a long axis of 25 mm and a short axis of 15 mm.

[0075] The materials listed here for the panel include, but are not limited to: steel, alloy, plastic, and single or composite materials. Steel includes, but is not limited to, stainless steel, carbon steel, and the like. Alloy includes, but is not limited to: aluminum alloy, chromium-molybdenum steel, samarium alloy, magnesium alloy, titanium alloy, magnesium-lithium alloy, and nickel alloy, etc. Plastic includes, but is not limited to: acrylonitrile butadiene styrene copolymer (ABS), polystyrene (PS), high-impact polystyrene (HIPS), polypropylene (PP), polyethylene terephthalate (PET), polyester (PES), polycarbonate (PC), polyamide (PA), polyvinyl chloride (PVC), polyethylene, and blow-molded nylon, etc.Composite materials include, but are not limited to: glass fiber, carbon fiber, boron fiber, graphite fiber, graphene fiber, silicon carbide fiber, aramid fiber, or other reinforcing materials. Composites made from other organic and / or inorganic materials are also possible, such as various glass fiber reinforced plastics made from substrates like glass fiber reinforced unsaturated polyester, epoxy resin, or phenol-formaldehyde.

[0076] In some other embodiments, the outer surface of the bone conduction loudspeaker panel is enveloped by a vibration-transmitting layer, which is in contact with the skin, and a vibration system consisting of the panel and the vibration-transmitting layer transmits vibrations to the tissues of the human body. The vibration-transmitting layer can be multilayered. The vibration-transmitting layer can be made of one or more materials. The material compositions for different vibration-transmitting layers can be either the same or different. The multilayered vibration-transmitting layers can be stacked on top of each other in a direction perpendicular to the panel or arranged next to each other in a direction parallel to the panel.Furthermore, the vibration-transmitting layers can also be stacked at an angle to the panel, and the angles between each layer and the panel can be either the same or different. Alternatively, the above methods can be combined in any way desired. The vibration-transmitting layer can be composed of a material with specific absorption capacity, flexibility, and chemical properties. For example, the plastic (such as macromolecular polyethylene, blow-molded nylon, and engineering plastics, but not limited to these) or the rubber can function as another single or composite material with the same properties.

[0077] In some embodiments, all areas of the panel are designed to contact or rest against the user's body after the bone conduction speaker has been worn. In other embodiments, only partial areas of the panel are designed to contact or rest against the user's body after the bone conduction speaker has been worn. In some embodiments, an area of ​​the panel used for contact with or resting against the user's body may comprise more than 50% of the total panel area, preferably more than 60%. Since the user's skin is typically flat, the surface area of ​​the panel in contact with the skin can be larger, and thus the volume can be higher, if the contact area of ​​the panel with the skin is designed as a plane or quasi-plane with minimal variation.For example, the panel could be a composite structure with a flat central area and rounded edges. One of the advantages of this design is that the panel not only maintains sufficient contact with the skin of the human body, but the curved surface also ensures adaptability when worn by different individuals.

[0078] In some embodiments, the panel 301 can fit the outer housing 302, forming a closed or quasi-closed cavity (for example, the panel or the outer housing may have a hole) to accommodate the drive unit. In particular, the panel 301 and the outer housing 302 can be formed integrally. That is, the panel and the outer housing are made of the same material, and the two do not have a clear structural boundary. Alternatively, the panel 301 can also be connected to the outer housing 302 by snap-fit, riveting, hot melting, or welding. In still other embodiments, the panel 301 can be connected to the outer housing 302 via a bonding medium. The bonding medium can be an adhesive, such as polyurethane, polystyrene, polyacrylate, ethylene-vinyl alcohol copolymer, shellac, butyl rubber, etc.The connecting medium can also be a specifically designed connecting component, such as a vibration transformer, a connecting rod, or the like. The stiffness of the outer housing and the panel itself, as well as the stiffness of the connection between the outer housing and the panel, influence the loudspeaker's frequency response. In some embodiments, the outer housing and the panel are made of materials with high stiffness, while the stiffness of a connecting medium between the outer housing and the panel is low. During vibration of the drive unit, the panel does not vibrate synchronously with the outer housing.In some other embodiments, the outer enclosure and the panel are made of materials with high stiffness, and the connection stiffness between the outer enclosure and the panel is also high, which increases the overall stiffness of the vibration system, so that the resonant part contains more high-frequency components. In some embodiments, adjusting the stiffness of the panel and the outer enclosure makes it possible to increase the stiffness of the panel and the outer enclosure, thereby shifting peaks and troughs in the high-frequency range to a higher frequency band. Further description of the relationship between component stiffness and sound quality may be found elsewhere herein (such as...). Fig. 7).

[0079] In some embodiments, the outer casing exhibits high rigidity and low mass, and can be set into mechanical vibration as a whole. Furthermore, the outer casing can ensure synchronization of the vibrations, thus generating mutually canceling sound losses to guarantee good sound quality and high volume. In some embodiments, the outer casing can be provided with or without a hole. For example, the outer casing may have a hole that can be used to adjust the sound loss of the bone conduction loudspeaker.

[0080] Stiffness can be understood as the resistance of a material or structure to elastic deformation under the influence of force, and this depends on the material's modulus of elasticity, the shape, structure, or mounting method of a component. For example, the stiffness of a component correlates positively with the component's modulus of elasticity or thickness and negatively with the component's surface area. In a specific embodiment, the component might be a panel, an outer casing, a transmission assembly, or the like. In particular, the stiffness of a plate-shaped component such as a panel can be represented by the following formula: k∝(Eh^3) / d^2, where k is the stiffness of the panel, E is the panel's modulus of elasticity, h is the panel's thickness, and d is the panel's radius.It can be seen that the corresponding stiffness of the panel is higher the smaller its radius and the greater its thickness and modulus of elasticity. In some further embodiments, the stiffness of a rod-shaped or strip-shaped transmission arrangement can be represented by the following formula: k∝(Eh^3 w) / l^3, where k represents the stiffness of the transmission arrangement, E the modulus of elasticity, h the thickness, w the width, and l the length. It can be seen that the corresponding stiffness of the transmission arrangement is higher the smaller its length and the greater its thickness, width, and modulus of elasticity.

[0081] In some embodiments, the drive unit is located in a closed or quasi-closed space formed by the panel and the outer housing (for example, if the panel or the outer housing has a hole). In still other embodiments, the drive unit is located in a closed or quasi-closed space formed by the outer housing, and the panel is arranged separately from the outer housing. The situation of the separate arrangement of the panel and the outer housing can be further described in Fig. Reference is made to section 15 and its relevant description. The drive unit serves to convert an electrical signal into oscillations with various frequencies and amplitudes. The operating modes of the drive unit include, but are not limited to: using a moving coil, using a moving iron, piezoelectric ceramic, or other operating modes.

[0082] This will be further explained below using the example of a moving coil. Fig. 3 The drive device assumes the drive type using a rotating coil and comprises a coil 304 and a magnetic circuit arrangement 307.

[0083] The magnetic circuit arrangement 307 can comprise a first magnetic element 3071, a first magnetically conductive element 3072, and a second magnetically conductive element 3073. The magnetic element described in the present application can be an element for generating a magnetic field, for example, a magnet or the like. The magnetic element can have a magnetization direction. The magnetization direction is a direction of the magnetic field within the magnetic element. The first magnetic element 3071 can comprise one or more magnets. In some embodiments, the magnet can be a magnet made of a metal alloy, a ferrite, or the like. The magnet made of a metal alloy can be neodymium-iron-boron, samarium-cobalt, aluminum-nickel-cobalt, iron-chromium-cobalt, aluminum-iron-boron, iron-carbon-aluminum, or the like, or a combination of several of these.The ferrite could be barium ferrite, steel ferrite, magnesium manganese ferrite, lithium manganese ferrite, or the like, or a combination of several of them.

[0084] The magnetically conductive element can also be referred to as a magnetic field concentrator or core, which can adjust the distribution of a magnetic field (for example, a magnetic field generated by the first magnetic element 3071). In some embodiments, a lower surface of the first magnetically conductive element 3072 can be connected to an upper surface of the first magnetic element 3071. The second magnetically conductive element 3073 can be configured as a concave structure and, in particular, comprise a bottom wall and side walls. An inner surface of the bottom wall of the second magnetically conductive element 3073 can be connected to the first magnetic element 3071. The side walls can surround the first magnetic element 3071 and form a magnetic gap between them and the first magnetic element 3071.The connection types between the first magnetically conductive element 3072, the second magnetically conductive element 3073 and the first magnetic element 3071 can include one or more combinations of adhesive connection, snap connection, weld connection, rivet connection, screw connection, etc.

[0085] The magnetically conductive element can be made of soft magnetic material. In some embodiments, the soft magnetic material can include: metal material, metal alloy, metal oxide material, and amorphous metal material, etc., such as iron, iron-silicon alloy, iron-aluminum alloy, nickel-iron alloy, iron-cobalt alloy, low-carbon steel, silicon steel sheet, and ferrite, etc. In some embodiments, the magnetic conductor can be processed by a combined method of one or more of the following: casting, plastic processing, machining, and powder metallurgy, etc. Casting can include sand casting, lost-wax casting, die casting, and centrifugal casting, etc. Plastic processing can include one or more combinations of rolling, casting, forging, stamping, pressing, and drawing, etc. Machining can include turning, milling, planing, and grinding, etc.In some embodiments, the method for processing the magnetic conductor may include 3D printing and CNC machine tools, etc.

[0086] It is understood that the above description of the drive unit's construction should not be considered a limitation of the present invention. In some other embodiments, several magnetic elements are provided in the magnetic circuit arrangement. The multiple magnetic elements are stacked on top of one another. Additional magnetically conductive elements may be provided in adjacent magnetic elements. Another magnetically conductive element may be provided on an upper surface of the uppermost magnetic element. The magnetic element is an element for generating a magnetic field. The magnetically conductive element serves to adjust the distribution of a magnetic field. The magnetic circuit arrangement structures provided according to specific requirements for the distribution of the magnetic field can all be used in the bone conduction loudspeaker of the present invention. The present invention is not limited thereto.

[0087] The coil 304 can be arranged in the magnetic gap between the first magnetic element 3071 and the second magnetically conductive element 3073. After the coil 304 has been energized in the magnetic gap, oscillations are generated under the influence of an ampere force (i.e., the driving force), and simultaneously the magnetic circuit arrangement 307 is subjected to a counterforce, thereby generating oscillations. The drive unit further comprises a transmission arrangement 303. The transmission arrangement 303 serves to transmit the oscillations of the coil 304 and / or the magnetic circuit arrangement 307 to the panel and / or the outer housing. The ampere force is an acting force to which a conductor energized in a magnetic field is subjected, its direction being perpendicular to a plane defined by the conductor energized and the magnetic field direction, and which can be determined using the left-hand rule. If the current direction orWhen the direction of the magnetic field changes, the direction of the ampere force also changes. In some embodiments, the magnetic field generated by the magnetic circuit arrangement is static. If the current direction changes, the direction of the driving force could be reversed along a straight line, and this straight line can be considered the line on which the driving force lies. Under the influence of the driving force, the coil is set into oscillation, and simultaneously, the magnetic circuit arrangement also generates oscillations due to a counterforce. The oscillations of the two usually exist along the same straight line and have exclusively opposite directions. This straight line can be considered the line on which the oscillations lie and is equivalent (i.e., parallel) to or identical with the straight line on which the driving force lies.

[0088] In some embodiments, the coil vibrations can be transmitted to the panel and / or the outer housing via a first transmission arrangement. The vibrations of the magnetic circuit arrangement can be transmitted to the panel and / or the outer housing via a second transmission arrangement.

[0089] In some embodiments, the coil generates vibrations after being subjected to the force of the ampere. These vibrations are transmitted to the panel and / or the outer casing via the first transmission arrangement. The coil and the magnetic circuit arrangement interact via the magnetic field. The resulting counterforce of the magnetic circuit arrangement also generates vibrations. These vibrations are then transmitted to the panel and / or the outer casing via the second transmission arrangement. In some specific embodiments, the transmission arrangement may also include a connecting rod or column and / or a vibration transformer, etc. In some embodiments, the transmission arrangement may possess an appropriate elastic force to achieve a damping effect during vibration transmission. This reduces the vibration energy transmitted to the outer casing.Thus, sound loss from the bone conduction loudspeaker to the external environment is effectively suppressed by the vibration of the outer casing. This also helps prevent the generation of abnormal sound through potential abnormal resonance, thereby improving sound quality. The vibration transmission efficiency can be influenced to varying degrees by the position of the transmission assembly within or on the outer casing. In some specific embodiments, the transmission assembly can bring the drive unit into different states, such as disengaged or supported. The vibration transducer can be a thin leaf spring. The main body of a specific vibration transducer can be designed as an annular structure.The ring-shaped structure contains several struts or connecting webs that converge towards the center. It is possible to include two or more struts or connecting webs. Further details regarding the transmission arrangement can be found in other sections (such as detailed embodiments).

[0090] In some specific embodiments, the straight line on which the driving force is located and the straight line on which the vibrations of the drive unit are located are collinear or parallel. In a drive unit based on the principle of a rotating coil, the direction of the driving force may, for example, be the same as or opposite to the direction of the vibration of the coil and / or the magnetic circuit arrangement. The panel may be either a flat or a curved surface. Alternatively, the panel may be provided with several protrusions or grooves. In some embodiments, the normal of the area on the panel that contacts or rests against the user's body is not parallel to the normal of the straight line on which the driving force is located after the bone conduction speaker has been worn on the user's body.Typically, the area on the panel that contacts or rests against the user's body is relatively flat. Specifically, it is a plane or quasi-plane with a non-significantly variable curvature. If the area on the panel used for contact with or resting against the user's body is a plane, a normal at any point in the plane can serve as the normal to the area. If the area on the panel used for contact with or resting against the user's body is an uneven surface, an average normal of the area can serve as the normal to the area. A detailed definition of the average normal can be found in the relevant description of [the relevant section / document]. Fig. Reference is made to Section 1. This will not be repeated here. If the panel used for contact with the user's body is an uneven surface, the normal of the area can also be determined in some other embodiments as follows: selecting a point in an area during contact of the panel with the skin of the human body, determining a tangent plane of the panel at that point, further determining a straight line passing through the point and perpendicular to the tangent plane, and using the straight line as the normal of the panel. According to a specific embodiment of the present invention, the straight line on which the driving force is located (or the straight line on which the vibration of the driving device is located) and the normal of the area form an angle θ, where 0 < θ < 180°.In some specific embodiments, the system is arranged such that the straight line on which the driving force is located has a positive direction extending beyond the panel (or the contact surface of the panel and / or the outer housing with the skin of the human body) from the bone conduction loudspeaker, and the normal of the panel (or the contact surface of the panel and / or the outer housing with the skin of the human body) has a positive direction extending away from the bone conduction loudspeaker, so that the angle of the two straight lines in positive directions is formed as an acute angle.

[0091] Furthermore, it is provided that in some embodiments a bone conduction loudspeaker 300 comprises: a panel 301, an outer housing 302, a first transmission arrangement 303, a coil 304, a vibration transducer 305, a second transmission arrangement 306, and a magnetic circuit arrangement 307. The vibrations of the coil 304 and the magnetic circuit arrangement 307 can be transmitted to the panel 301 and / or the outer housing 302 via various paths. For example, the vibrations of the coil 304 can be transmitted to the panel 301 and / or the outer housing 302 via a first transmission path. The vibrations of the magnetic circuit arrangement 307 can be transmitted to the panel 301 and / or the outer housing 302 via a second transmission path.The first transmission path can comprise a first transmission arrangement 303, and the second transmission path comprises a second transmission arrangement 306, a vibration transformer 305, and the first transmission arrangement 303. In particular, the first transmission arrangement 303 is partially configured as a flanged structure, the flange being annular and fitting to the coil 304 structure, and connected to an end face of the coil 304. The other part of the first transmission arrangement 303 is configured as a connecting rod connected to the panel and / or the outer housing. The coil 304 is fully or partially inserted into a magnetic gap of the magnetic circuit arrangement 307. In the second transmission path, the second transmission arrangement 306 is connected between the magnetic circuit arrangement 307 and the vibration transformer 305.One edge of the vibration transmitter 305 is attached to the flange of the first transmission arrangement 303. The center of the vibration transmitter 305 is connected to one end of the second transmission arrangement 306, and one edge of the vibration transmitter 305 can be connected to the inside of the flange of the first transmission arrangement 303, with the type of connection being: snap-fit, hot pressing, riveting, bonding, injection molding, or the like. It should be noted that the first transmission path and the second transmission path can also be configured differently. The present embodiment is not intended to limit the transmission arrangement. Further descriptions of the transmission arrangement can be found in other sections herein.

[0092] In some embodiments, the coil 304 and the magnetic circuit arrangement 307 are configured as ring-shaped structures. In some embodiments, the coil 304 and the magnetic circuit arrangement 307 have axes parallel to each other. The axis of the coil 304 or the magnetic circuit arrangement 307 is perpendicular to a radial plane of the coil 304 and / or a radial plane of the magnetic circuit arrangement 307. In still some embodiments, the coil 304 and the magnetic circuit arrangement 307 have the same central axis. The central axis of the coil 304 is perpendicular to the radial plane of the coil 304 and passes through the geometric center of the coil 304. The central axis of the magnetic circuit arrangement 307 is perpendicular to the radial plane of the magnetic circuit arrangement 307 and passes through the geometric center of the magnetic circuit arrangement 307. The axis of the coil 304 or the magnetic circuit arrangement 307 and the normal of the panel 301 form the angle θ mentioned above.

[0093] In the present embodiment, the current-energized coil 304 generates an ampere force in a magnetic field produced by the magnetic circuit arrangement 307, thereby producing oscillations. These oscillations of the coil 304 are transmitted to the panel 301 via the first transmission arrangement 303, and the resulting counterforce of the magnetic circuit arrangement 307 generates further oscillations. The oscillations generated by the magnetic circuit arrangement 307 are then transmitted to the panel 301 via the second transmission arrangement 306, the vibration transmitter 305, and the first transmission arrangement 303. Subsequently, the oscillations of the coil 304 and the oscillations of the magnetic circuit arrangement 307 are transmitted via the panel 301 to the skin and bones of the human body, thus producing sound.Simply put, the vibrations generated by the coil 304 and the vibrations generated by the magnetic circuit arrangement 307 form composite vibrations, which are transmitted to the panel 301. These composite vibrations are then transmitted via the panel 301 to the skin and bones of the human body, resulting in bone-conducted sound being heard.

[0094] As just an example, the relationship between the driving force F and the deformation of the skin S is discussed in conjunction with Fig. 3 explained. If the straight line on which the driving force generated by the driving device lies is parallel to the normal of panel 301 (that is, the angle θ is zero), the following applies to the relationship between the driving force and the total deformation of the skin: F ⊥ = S ⊥ × E × A / h (1), where F ⊥ for the magnitude of the driving force, S ⊥for the total deformation of the skin in a direction perpendicular to the skin, E for the elastic modulus of the skin, A for the contact area of ​​the panel with the skin and h for the total thickness of the skin (i.e. the distance between the panel and the bone).

[0095] If the straight line on which the driving force of the drive device is located is perpendicular to the normal of the area on the panel that contacts or rests against the user's body (that is, the angle θ is 90 degrees), the following can apply to the relationship between the driving force in the perpendicular direction and the total deformation of the skin, as shown in formula (2): F / / =S / / ×G×A / h where F / / for the magnitude of the driving force, S / / The total deformation of the skin in a direction parallel to the skin is represented by G, the shear modulus of the skin, A the contact area of ​​the panel with the skin, and h the total thickness of the skin (i.e., the distance between the panel and the bone). The relationship between the shear modulus G and the elastic modulus E is given by: G = E / 2 (1 + γ), where γ is the Poisson's ratio of the skin, and 0 < γ < 0.5. Therefore, the shear modulus G is smaller than the elastic modulus E, and consequently, the total deformation of the skin under the same driving force is given by: S / / > S ⊥ The Poisson's value of skin is usually approximately 0.4.

[0096] If the straight line on which the driving force generated by the drive device is located is not parallel to the normal of an area of ​​the panel in contact with the user's body, the driving force in the horizontal direction and the driving force in the vertical direction are each represented by the following formula (3) and formula (4): F⊥=F×cos(θ) F / / =F×sin(θ) where the relationship between the driving force F and the deformation of the skin S can be represented by the following formula (5): S=2S⊥2+S / / 2=hA×F×2(cos(θ) / E)2+(sin(θ) / G)2

[0097] If the Poisson's ratio of the skin is 0.4, the detailed description of the relationship between the angle θ and the total deformation of the skin is given by Fig. 4 can be seen.

[0098] Fig. Figure 4 shows a diagram of an angle as a function of a relative displacement of the bone conduction loudspeaker according to the present invention. As in Fig. As shown in Figure 4, the relationship between the angle θ and the total skin deformation S is such that the total skin deformation S is greater the larger the angle θ and the relative displacement are. For the skin deformation in the direction S perpendicular to the skin... ⊥ It is true that the deformation of the skin in a direction perpendicular to the skin S ⊥ The effect decreases with increasing angle θ and decreasing relative displacement. When angle θ is nearly 90 degrees, the skin deformation approaches a direction S perpendicular to the skin. ⊥ gradually reaching 0.

[0099] The volume of the bone conduction earphone in the low-frequency range correlates positively with the total skin deformation S. The larger S is, the higher the volume of bone conduction at low frequencies. The volume of the bone conduction earphone in the high-frequency range correlates positively with the skin deformation in a direction perpendicular to the skin S. ⊥ The larger S ⊥ The higher the volume, the greater the volume of bone conduction at low frequencies.

[0100] If the Poisson's ratio of the skin is 0.4, the detailed description of the relationship between the angle θ, the total deformation of the skin S and the deformation of the skin in a direction perpendicular to the skin S is ⊥ out of Fig. 4 can be seen. As in Fig. As shown in Figure 4, the relationship between the angle θ and the total skin deformation S is such that the total skin deformation S is greater the larger the angle θ is. Accordingly, the volume of the bone conduction earphone is higher in the low-frequency range. As shown in Fig. As shown in Figure 4, the relationship between the angle θ and the deformation of the skin in a direction S⊥ perpendicular to the skin is such that the deformation of the skin in a direction S⊥ perpendicular to the skin is smaller the larger the angle θ is. Accordingly, the volume of the bone conduction earphone is lower in the high-frequency range.

[0101] It is defined by equation (4) and the curve in Fig. 4. It is evident that with the increase of the angle θ, the rate of increase of the total deformation of the skin S differs from the rate of decrease of the deformation of the skin in a direction perpendicular to the skin S. ⊥The rate of increase of the total skin deformation S changes first faster and then slower, and the rate of decrease of the skin deformation in a direction perpendicular to the skin S ⊥ The frequency response is changing ever more rapidly. To compensate for the volume of the bone conduction earphone at low and high frequencies, the angle θ must be appropriately dimensioned. For example, θ is in the range of 5° to 80°, 15° to 70°, 25° to 50°, 25° to 35°, 25° to 30°, etc.

[0102] Fig. Figure 5 shows a diagram of a frequency response curve of the bone conduction loudspeaker according to the present invention. As in Fig. As shown in Figure 5, the horizontal axis represents the frequency of the vibration, and the vertical axis represents the amplitude of the bone conduction earphone's vibration. In some embodiments, the frequency response curve is designed to be smoother at frequencies within the 500 to 6000 Hz range. This indicates better sound quality for the bone conduction earphone. The structure of the bone conduction earphone, the design of its components, the material properties, and similar factors can influence the frequency response curve. Generally, low frequency refers to sound with a frequency below 500 Hz, medium frequency to sound with a frequency in the 500 to 4000 Hz range, and high frequency to sound with a frequency above 4000 Hz. As shown in Figure 5, the frequency response curve is further defined as follows: Fig. As shown in Figure 5, the frequency response curve of the bone conduction earphone can exhibit two resonance peaks (510 and 520) in the low-frequency range, as well as a first high-frequency trough (530), a first high-frequency peak (540), and a second high-frequency peak (550) in the high-frequency range. The two resonance peaks (510 and 520) in the low-frequency range can arise from the interaction of a vibration transformer with an earphone mounting arrangement. The first high-frequency trough (530) and the first high-frequency peak (540) can arise from deformation of the side surface of the outer housing at high frequencies. The second high-frequency peak (550) can arise from deformation of the outer housing panel at high frequencies.

[0103] The positions of various resonance peaks and high-frequency peaks / troughs depend on the stiffness of the corresponding arrangements. Stiffness refers to the degree of softness and hardness, as well as the resistance of a material or structure to elastic deformation. Stiffness depends on the Young's modulus and the size of the material. The higher the stiffness, the less a structure subjected to a force will deform. As described above, the frequency response in the 500 to 6000 Hz range is particularly critical for bone conduction earphones. Sharp peaks and troughs are undesirable in this frequency range. The flatter the frequency response curve, the better the sound quality of the earphone.In some embodiments, it is provided that by adjusting the stiffness of the outer casing panel and the back of the outer casing, peaks and troughs in the high-frequency range can be adjusted to a higher frequency range.

[0104] Fig. Figure 6 shows a schematic diagram in a low frequency band of the frequency response curve of the bone conduction loudspeaker at different angles θ according to the present invention. As in Fig. As shown in Figure 6, the panel is in contact with the skin, and thus vibration is transmitted to the skin. During this process, the vibration of the bone conduction loudspeaker is also influenced by the skin, affecting its frequency response curve. Based on the analysis above, it is found that the total deformation of the skin under the same driving force is greater the larger the angle. For the bone conduction loudspeaker, this means that the elasticity of the skin is reduced relative to the area of ​​the panel.It is further understood that the resonance peak in the low-frequency range of the frequency response curve can be adjusted to a range with lower frequencies, so that deeper bass extension at low frequencies is achieved and the low frequencies occur more frequently when the straight line on which the driving force of the drive device is located and the normal of the area on the panel that contacts or rests against the user's body form a certain angle θ, and especially when the angle θ is increased.Compared to other technical solutions for increasing the low frequencies of sound, such as the additional provision of a vibration transformer for the bone conduction speaker, adjusting the angle allows for the effective suppression of the vibration sensation while simultaneously increasing the energy of the low frequencies. This results in a relatively reduced vibration sensation, increased sensitivity to low frequencies from the bone conduction speaker, and improved sound quality and the overall experience for the human body. It should be noted that in some embodiments, low frequencies occur more frequently. The reduced vibration sensation can manifest itself as follows: increasing the angle θ in the range (0, 90°) increases the energy in the low-frequency range of the vibrations or sound signals, and consequently, also the vibration sensation.However, the increase in energy in the low-frequency range is greater than the increase in the perceived vibration. Therefore, the perceived vibration is relatively reduced in terms of its effect.

[0105] It's out Fig. 6. It is evident that at a large angle the resonance peak in the low frequency range occurs in a lower frequency band, which allows a frequency range with a flat curvature to be enlarged in a modified shape, thus increasing the sound quality of the earphone.

[0106] Fig. Figure 7 shows a schematic diagram in a high frequency band of the frequency response curve of the bone conduction loudspeaker with a panel or an outer housing made of different materials according to the present invention. As in Fig. As shown in Figure 7, the frequencies associated with a first and second high-frequency peak of a panel and outer casing are higher when they are made of harder materials. Compared to panels and outer casings made of harder materials, the frequencies associated with the first and second high-frequency peaks of the panel and outer casing are lower when they are made of softer materials. Furthermore, the frequency associated with the first high-frequency trough of the panel and outer casing is higher when they are made of harder materials. Compared to panels and outer casings made of harder materials, the frequency associated with the first high-frequency trough of the panel and outer casing is lower when they are made of softer materials. It can be observed that rigid (hard) materials for the panel and outer casing can increase the corresponding frequency values ​​when high-frequency peaks / troughs occur.As described above. Fig. As can be seen in Figure 5, the frequency response in the 1000 to 10000 Hz range is particularly critical for bone conduction earphones. Sharp peaks and troughs are undesirable in this frequency range. The flatter the frequency response curve, the better the sound quality of the earphone. This is due to the rigid (hard) materials used for the panel and outer casing. Fig. 7. A frequency range with a flat curvature can be enlarged in a modified shape, thus increasing the sound quality of the earphone.

[0107] In some embodiments, the stiffnesses of different assemblies (for example, the outer casing, the transmission assembly, and the drive unit, etc.) depend on the Young's modulus, thickness, size, or similar properties of their materials. This is described below using the example of the relationship between the stiffness of the outer casing and its material. In some embodiments, the outer casing may comprise a panel, a rear panel, and side faces. The panel, rear panel, and side faces may be made of the same material or of different materials. For example, the rear panel and the panel may be made of the same material, while the side faces may be made of a different material.In some embodiments, the stiffness of the outer casing increases with the Young's modulus of the casing material, provided the dimensions remain unchanged. This shifts the peaks and troughs of the earphone's frequency response curve towards higher frequencies, thus shifting these peaks and troughs to higher frequencies. In some embodiments, adjusting the Young's modulus of the outer casing material allows the high-frequency peaks and troughs of the frequency response curve to be adjusted to a higher frequency.In some embodiments, a material with a specific Young's modulus is used, wherein the Young's modulus of the outer casing can be greater than 2000 MPa, preferably greater than 4000 MPa, preferably greater than 6000 MPa, preferably greater than 8000 MPa, preferably greater than 12000 MPa, more preferably greater than 15000 MPa and further preferably greater than 18000 MPa.

[0108] In some embodiments, adjusting the stiffness of the outer casing allows the frequencies of the high-frequency peaks and troughs of the frequency response curve of the bone conduction earphone to be no less than 1000 Hz, preferably no less than 2000 Hz, preferably no less than 4000 Hz, preferably no less than 6000 Hz, more preferably no less than 8000 Hz, more preferably no less than 10000 Hz, more preferably no less than 12000 Hz, more preferably no less than 14000 Hz, more preferably no less than 16000 Hz, more preferably no less than 18000 Hz, and more preferably no less than 20000 Hz. In some embodiments, adjusting the stiffness of the outer casing allows the frequencies of the high-frequency peaks and troughs of the frequency response curve of the bone conduction earphone to lie outside the audible range of the human ear.In some embodiments, adjusting the stiffness of the outer casing allows the frequencies of the high-frequency peaks and troughs of the earphone's frequency response curve to lie within the audible range of the human ear. In some embodiments, when multiple high-frequency peaks / troughs are present, adjusting the stiffness of the outer casing allows the frequencies of one or more of these peaks / troughs to lie outside the audible range of the human ear, while the frequencies of one or more of the remaining peaks / troughs remain within the audible range of the human ear.For example, it is made possible that the second high-frequency peak is located outside the hearing range of the human ear, and that the first high-frequency valley and the first high-frequency peak are located within the hearing range of the human ear.

[0109] In some embodiments, the rigidity of the outer casing can be increased by modifying the connection methods of the outer casing panel, the rear of the outer casing, and the side surfaces of the outer casing to ensure that the outer casing as a whole exhibits high rigidity. In some embodiments, the outer casing panel, the rear of the outer casing, and the side surfaces of the outer casing can be formed in one piece. The outer casing panel and the side surfaces of the outer casing can be directly bonded and fastened together using an adhesive. Alternatively, they can be joined by a snap-fit ​​or welded connection. The adhesive can be a high-viscosity, high-hardness adhesive.In some embodiments, the outer casing panel and the outer casing side surfaces can be formed as a single-piece structure. The rear of the outer casing and the outer casing side surfaces can be directly bonded and fastened together using an adhesive. Alternatively, they can be joined by a snap-fit ​​or welded connection. The adhesive can be a high-viscosity, high-hardness adhesive. In some embodiments, the outer casing panel, the rear of the outer casing, and the outer casing side surfaces can be formed as separate components, with the three components being firmly joined together by an adhesive, a snap-fit, a welded connection, or a combination thereof.For example, the outer casing panel and the outer casing sides are bonded together with adhesive, and the rear of the outer casing and the outer casing sides are bonded together by a snap-fit ​​or welded connection. Alternatively, the rear of the outer casing and the outer casing sides are bonded together with adhesive, and the outer casing panel and the outer casing sides are bonded together by a snap-fit ​​or welded connection.

[0110] In some embodiments, materials with different Young's moduli can be combined to increase the overall stiffness of the outer casing. In some embodiments, the outer casing panel, the back of the outer casing, and the side surfaces of the outer casing can be made of the same material. In some embodiments, the outer casing panel, the back of the outer casing, and the side surfaces of the outer casing can be made of different materials. These different materials can have either the same Young's modulus or different Young's moduli. In some embodiments, the outer casing panel and the back of the outer casing are made of the same material, while the side surfaces of the outer casing are made of a different material. The Young's moduli of the two materials can be either the same or different.For example, the Young's modulus of the material used for the outer casing's side surfaces may be greater than the Young's modulus of the material used for the outer casing's panel and rear surface. Alternatively, the Young's modulus of the outer casing's side surface material may be less than the Young's modulus of the material used for the outer casing's panel and rear surface. In some embodiments, the outer casing's panel and side surfaces are made of the same material, while the outer casing's rear surface is made of a different material. The Young's moduli of the two materials may be either the same or different. For example, the Young's modulus of the material used for the rear surface of the outer casing may be greater than the Young's modulus of the material used for the outer casing's panel and side surfaces.Alternatively, the Young's modulus of the material of the rear of the outer casing can be smaller than the Young's modulus of the material of the outer casing panel and the outer casing side surfaces. In some embodiments, the rear of the outer casing and the outer casing side surfaces are made of the same material, while the outer casing panel is made of a different material. The Young's moduli of the two materials can be either the same or different. For example, the Young's modulus of the material of the outer casing panel can be larger than the Young's modulus of the material of the rear of the outer casing and the outer casing side surfaces. Alternatively, the Young's modulus of the material of the outer casing panel can be smaller than the Young's modulus of the material of the rear of the outer casing and the outer casing side surfaces.In some embodiments, the outer casing panel, the rear of the outer casing, and the side surfaces of the outer casing are made of different materials. The Young's moduli of the three materials can all be the same or different, and the Young's moduli of the three materials can be greater than 2000 MPa.

[0111] In some embodiments, by adjusting the stiffness of the vibration transformer and the earphone mounting arrangement, it is made possible that two resonance peaks of the bone conduction earphone in the low frequency range are less than 2000 Hz, preferably less than 1000 Hz and more preferably less than 500 Hz.

[0112] In some embodiments, the present application provides that by adjusting the stiffness of respective components (for example, the outer casing, a support of the outer casing, the vibration transducer, or an earphone mounting arrangement) of the bone conduction earphone, the peaks and troughs in the high-frequency range are set to higher frequencies and the resonance peaks at low frequencies are set to a lower frequency in order to ensure that the frequency response curve is flat in the range from 1000 Hz to 10000 Hz and thus the sound quality of the bone conduction earphone is improved.

[0113] On the other hand, sound loss could occur during the vibration transmission of the bone conduction earphone. This sound loss refers to the fact that the vibration of the internal components and the outer casing of the bone conduction earphone causes a change in the volume of the surrounding air, creating a region of compression or rarefaction, which then spreads in all directions. This results in sound transmission to the environment, allowing someone other than the wearer of the bone conduction earphone to hear the sound emanating from the earphone. The present application can provide solutions for reducing sound loss from the bone conduction earphone by modifying the structure and stiffness of the outer casing, etc.

[0114] In some embodiments, the sound loss of the bone conduction loudspeaker can be further and effectively reduced by a carefully designed vibration-generating element with a vibration-transmitting layer (not shown). Preferably, the sound loss can be reduced by forming a hole in the surface of the vibration-transmitting layer. For example, the vibration-transmitting layer is bonded to the panel with an adhesive. The degree of protrusion of an area of ​​the vibration-transmitting layer bonded to the panel is greater than that of an unbonded area. A cavity exists beneath the unbonded area. An unbonded area of ​​the vibration-transmitting layer and the surface of the outer housing are each provided with sound-conducting holes. Preferably, an unbonded area with some sound-conducting holes is not in contact with the user.On the one hand, the sound-conducting holes can effectively reduce the area of ​​the unbonded region on the vibration-transmitting layer, thus allowing air permeability between the inside and outside of the vibration-transmitting layer and reducing pressure differentials between the inside and outside, thereby reducing vibration of the unbonded region. On the other hand, the sound waves generated by the vibration of the air inside the outer casing are channeled out of the outer casing through the sound-conducting holes, and they cancel out the sound loss waves generated by the vibration of the outer casing in the air outside, thus reducing the amplitude of the sound loss waves.

[0115] In some embodiments, the direction in which the drive unit generates a driving force and the direction of the panel do not form an angle in only one way. Fig. Figures 8 to 16 are examples of arrangements of the drive unit and the panel, illustrated by various embodiments. First embodiment

[0116] Fig. Figure 8 shows a schematic, axially sectioned structural representation of the bone conduction loudspeaker according to a first embodiment of the present invention. As in Fig. As shown in Figure 8, in some embodiments a bone conduction loudspeaker 800 comprises a panel 801, an outer housing 802, a first transmission arrangement 803, a coil 804, a vibration transformer 805, and a magnetic circuit arrangement 806. The panel 801 and the outer housing 802 form a closed or quasi-closed cavity, with a drive unit comprising the first transmission arrangement 803, the coil 804, the vibration transformer 805, and the magnetic circuit arrangement 806 located in the cavity.

[0117] In some embodiments, the coil 804 and the magnetic circuit assembly 806 are configured as ring-shaped structures. In some embodiments, the coil 804 and the magnetic circuit assembly 806 have axes parallel to each other. The axis of the drive unit is related to the axis of the coil 804 and / or the magnetic circuit assembly 806. The axis of the drive unit and the normal to the area on the panel that contacts or rests against the user's body form the angle θ, where 0 < θ < 90°. In particular, the axis of the drive unit and the normal to the area of ​​the panel that contacts or rests against the user's body form the angle θ. The axis of the coil 804 or the magnetic circuit assembly 806 and its spatial relationship to the normal can be found in the relevant description in Fig. 3 referred to, which will not be repeated here.

[0118] In some embodiments, the first transmission arrangement 803 is partially configured as an annular structure that fits the structure of the coil 804, and the annular structure is connected to an end face of the coil 804. The other part of the first transmission arrangement 803 is configured as a connecting rod that is connected to the panel and / or the outer housing. The coil 804 is fully or partially inserted into a magnetic gap of the magnetic circuit arrangement 806. The coil 804 is fully or partially inserted into an annular groove of the magnetic circuit arrangement 806. In the present embodiment, an annular end face of the magnetic circuit arrangement 806 is connected to an outer edge of the vibration transformer 805. The first transmission arrangement 803 passes through a central region of the vibration transformer 805 and is rigidly connected to it.

[0119] The current-energized coil 804 generates an ampere force in a magnetic field produced by the magnetic circuit assembly 806, thereby generating oscillations. These oscillations of the coil 804 are transmitted to the panel 801 via the first transmission assembly 803, and the resulting counterforce of the magnetic circuit assembly 806 generates further oscillations. The oscillations generated by the magnetic circuit assembly 806 are transmitted directly to the first transmission assembly 803 via the vibration transformer 805 and then to the panel 801. Subsequently, the oscillations of the coil 804 and the oscillations of the magnetic circuit assembly 806 are transmitted via the panel 801 to the skin and bones of the human body, thus producing sound.It is understood that, through the direct connection of the vibration transformer to the magnetic circuit arrangement 806 and the first transmission arrangement 803, the vibrations generated by the magnetic circuit arrangement 806 are transmitted directly to the panel via the first transmission arrangement 803. In turn, the vibrations generated by the coil 804 and the vibrations generated by the magnetic circuit arrangement 806 combine to form vibrations, which are then transmitted to the panel 801. Subsequently, these combined vibrations are transmitted via the panel 801 to the skin and bones of the human body, and bone-conducted sound is perceived. Second embodiment

[0120] Fig. Figure 9A shows a schematic, axially sectioned structural representation of the bone conduction loudspeaker according to a second embodiment of the present invention. A bone conduction loudspeaker 900a comprises a panel 901, an outer housing 902, a first transmission assembly 903, a coil 904, a vibration transducer 905, a second transmission assembly 906, and a magnetic circuit assembly 907. The first transmission assembly 903 is designed as a hollow circular cylinder. One end face of the first transmission assembly 903 is connected to the panel 901, and the other end face of the first transmission assembly 903 is connected to an end face of the coil 904. The coil 904 is fully or partially inserted into an annular groove or a magnetic gap of the magnetic circuit assembly 907. It is understood that the coil 904 and the magnetic circuit assembly 907 are designed as annular structures.In some embodiments, the coil 904 and the magnetic circuit assembly 907 have axes parallel to each other. The axis of the coil 904 or the magnetic circuit assembly 907, as well as its spatial relationship to the normal of the area on the panel used for contact with or attachment to the user's body, can be found in the relevant description in [reference to relevant section]. Fig. Reference is made to Section 3, which is not repeated herein. The center or a near-center region of the magnetic circuit assembly 907 is connected to one end of the second transmission assembly 906, and the other end of the second transmission assembly 906 is connected to the center or near-center region of the vibration transducer 905. The outer edge of the vibration transducer 905 is connected to an inner surface of a flange of the first transmission assembly 903. The types of connection include, but are not limited to, snap-fit ​​connections, hot pressing, bonding, injection molding, and the like.

[0121] In the present embodiment, the current-energized coil 904 generates an ampere force in a magnetic field produced by the magnetic circuit arrangement 907, thereby producing oscillations. These oscillations of the coil 904 are transmitted to the panel 901 via the first transmission arrangement 903, and the resulting counterforce of the magnetic circuit arrangement 907 generates further oscillations. The oscillations generated by the magnetic circuit arrangement 907 are transmitted to the panel 901 via the second transmission arrangement 906, the vibration transmitter 905, and the first transmission arrangement 903. Subsequently, the oscillations of the coil 904 and the oscillations of the magnetic circuit arrangement 907 are transmitted via the panel 901 to the skin and bones of the human body, thus producing sound.Simply put, the vibrations generated by coil 904 and those generated by magnetic circuit arrangement 907 form composite vibrations, which are transmitted to panel 901. These composite vibrations are then transmitted via panel 901 to the skin and bones of the human body, resulting in bone-conducted sound being heard.

[0122] The in Fig. The embodiment shown in 9A differs from the one in Fig. In the embodiment shown in Figure 8, the first transmission arrangement is designed not as a connecting rod, but as a hollow circular cylinder structure. This allows the first transmission arrangement to fit the coil more snugly, thus increasing the structure's stability. Simultaneously, the frequency for generating the higher-order modality of the loudspeaker (i.e., vibrations at different points in the loudspeaker are not synchronized) is increased, and the low-frequency resonance peaks of the bone conduction loudspeaker's frequency response curve are shifted towards lower frequencies. This broadens the flat region of the frequency response curve and thus improves the loudspeaker's sound quality.

[0123] Fig. Figure 9B shows a schematic exploded structural representation of components of the bone conduction loudspeaker according to a product example of the second embodiment of the present invention. Fig. Figure 9C shows a schematic, longitudinally sectioned structural representation of the bone conduction loudspeaker in Fig. 9B. The one in Fig. The bone conduction loudspeaker shown in 9B or 9C is structurally identical to the bone conduction loudspeaker in Fig. 9A.

[0124] As in Fig. As shown in Figure 9B, a bone conduction loudspeaker 900b comprises an arrangement 910 consisting of a vibration plate and a face-contouring silicone, a carrier or vibration transmitter 911, a coil 912, a connecting part 913, a bolt-nut arrangement 914, an upper magnet 915, a magnetically conductive plate 916, a lower magnet 917, a magnetically conductive cover 918, a PCB 919 for a multifunctional button, a silicone 920 for a multifunctional button, a loudspeaker housing 921, a multifunctional button 922 for an ear hook, and an ear hook 923. As shown in Fig. As shown in Figure 9C, the arrangement 910, consisting of a vibration plate and a face-fitting silicone, further comprises a face-fitting silicone 9101 and a vibration plate 9102. The support or vibration transmitter 911 further comprises a support 9111 and a vibration transmitter 9112. The bolt-nut arrangement 914 further comprises a bolt 9141 and a nut 9142. The vibration plate 9102 can function in the same way as the panel described above, and the face-fitting silicone 9101 serves as a soft material covering the panel. It should be understood that the face-fitting silicone 9101 is not a necessary component and may be omitted in some embodiments. The support 9111 can serve as the first transmission arrangement described above. The connecting part 913 can serve as the second transmission arrangement described above. The loudspeaker housing 921 can serve as the outer housing described above.

[0125] With reference to Fig. 9C forms the assembly 910, consisting of a vibration plate and a face-fitting silicone, together with the loudspeaker housing 921, creating a closed or quasi-closed cavity to accommodate components such as a magnetic circuit assembly and a transmission assembly, etc. The magnetically conductive cover 918 is designed as a concave structure and includes, in particular, a base plate and side walls. The upper magnet 915, the magnetically conductive plate 916, and the lower magnet 917 are stacked on top of each other on the base plate of the magnetically conductive cover 918. The upper magnet 915, the magnetically conductive plate 916, the lower magnet 917, and the magnetically conductive cover 918 each have a through-hole and are assembled together by the bolt-nut 914 to form the magnetic circuit assembly.A magnetic gap is formed between the magnetically conductive cover 918 and the upper magnet 915, the magnetically conductive plate 916, and the lower magnet 917, which are arranged on the base plate of the magnetically conductive cover. The coil 912 is partially or completely arranged within the magnetic gap. As shown in... Fig. As shown in Figures 9D and 9E, the support 9111 can be configured as a ring-shaped structure with uneven thickness. In particular, one side is thicker than the other. The dimensions of one end face of the support 9111 are adapted to the coil 912 and are connected to an end face of the coil 912, while the other end of the support 9111 rests against or is connected to the arrangement 910 consisting of a vibration plate and a face-fitting silicone. Because one side of the support 9111 is thicker than the other, the drive unit can be arranged at an angle relative to the arrangement 910 consisting of a vibration plate and a face-fitting silicone to ensure that the axis of the drive unit (orThe direction of the driving force and the normal of a contact surface (the surface in contact with the skin of the human body) of the arrangement 910, consisting of a vibration plate and a face-fitting silicone, form an angle θ. The connecting part 913 connects the upper magnet 915 in the magnetic circuit arrangement to the vibration transmitter 9112 and serves to transmit vibrations. Specific connection types include, but are not limited to: screw connections, adhesive connections, and welded connections, etc. One edge of the vibration transmitter 9112 is snapped onto an inner surface of the carrier 9111. The carrier 9111 simultaneously performs the function of transmitting the vibrations of the coil and the vibrations of the magnetic circuit arrangement to the arrangement 910, consisting of a vibration plate and a face-fitting silicone.An outer edge of the carrier can be engaged in a groove or a limiting detent groove in an inner wall of the loudspeaker housing 921 and thus be secured in the cavity, so that the carrier can simultaneously perform a function for suspending or supporting the entire drive unit during transmission.

[0126] Fig. 9D and Fig. Figures 9E each show a schematic structural representation of a carrier of the bone conduction loudspeaker according to some specific embodiments of the present invention. As in Fig. As shown in Figures 9D and 9E, the support 9111 comprises, by way of example, a ring-shaped body 91111, wherein the body can be configured as a ring-shaped, plate-like structure, and wherein the body is configured with a ring-shaped standing surface 91112 that matches the shape of the body. One side of the standing surface 91112 is lower than its other side (for example, side A of the standing surface is lower than side B of the standing surface). Transitions between the higher and lower sides can be achieved either by connecting sections C, D with continuously changing heights or by connecting sections with non-continuously changing heights. For example, the connecting sections C, D can be configured as stepped designs with non-continuously changing heights.It should be noted that side A, side B, connecting section C, and connecting section D can be considered four distinct points on the standing surface 91112. They can be formed integrally and have no significant boundaries between them. Alternatively, side A, side B, connecting section C, and connecting section D can be structurally separate but joined together by an additional joining method. This joining method could be adhesive bonding, welding, hot-melt bonding, etc. The support 9111 serves to connect the coil to the arrangement 910, consisting of a vibration plate and a face-fitting silicone, to transmit vibrations.In particular, a lower end surface of the body 91111 of the carrier can be firmly connected to an upper end surface of the coil, and an upper end surface of the stationary surface 91112 rests against or is in contact with the arrangement 910 consisting of a vibration plate and a face-fitting silicone (cf. . Fig. 9C). In some embodiments, the distance between the arrangement 910, consisting of a vibration plate and a face-mounted silicone, and the drive unit (such as the coil) is large, resulting in a substantial height of the standing surface. If the standing surface 91112 is thin, its strength is low and it is susceptible to damage. If the standing surface 91112 is thick, its weight is high, which in turn affects transmission and thus the sound quality. Consequently, in some embodiments, several reinforcing ribs 91113 are provided on the outside or inside of the standing surface 91112, thereby ensuring not only the strength of the standing surface 91112 but also preventing any impact on the sound quality.In some embodiments, the reinforcing rib 91113 is a smaller, vertical surface perpendicular to the vertical surface 91112, with one end surface connected to the body 91111 and the other end surface connected to the vertical surface 91112. The connection methods include, but are not limited to, adhesive bonding, welding, thermoforming, or one-piece forming. In some embodiments, the reinforcing rib 91113 can also be a short, small strut, the strut being supported obliquely between the vertical surface and the body, with one end of the strut connected to the body 91111 and the other end connected to the vertical surface 91112. The connection methods include, but are not limited to, adhesive bonding, welding, thermoforming, or one-piece forming. Third example

[0127] Fig. Figure 10 shows a schematic, axially sectioned structural representation of the bone conduction loudspeaker according to a third embodiment of the present invention. A bone conduction loudspeaker 1000 differs from the bone conduction loudspeaker 1000 in the mounting position and the length of a first transmission arrangement 1003. The first transmission arrangement 1003 can comprise several connecting rods or connecting columns, wherein the ends of some of the connecting rods are connected to a panel 1001 and the ends of the other connecting rods are connected to a first end face 1002 of the outer housing, and wherein the other end of each connecting rod is connected to an end face of a coil 1004.This means that the respective connecting rods are distributed around the circumference of the coil 1004 between the coil and the panel and / or the outer housing, whereby the respective connecting rods can be distributed either equidistantly or not equidistantly. As a variant of the present embodiment, it is provided that the first transmission arrangement 1003 can also be designed as a hollow circular cylinder, like the first transmission arrangement 903, the cross-section of which matches the size and shape of the coil. A first end face of the first transmission arrangement 1003 is connected to an end face of the coil. Part of the second end face of the first transmission arrangement 1003 is connected to the panel 1001, and the other part is connected to the outer housing 1002.

[0128] In comparison to the bone conduction loudspeaker 900, the first transmission arrangement 1003 of the bone conduction loudspeaker 1000 has a shorter length, which contributes to a further increase in frequency to generate the higher order modality of the loudspeaker (that is, vibrations at different points of the loudspeaker are not in agreement). Fourth embodiment

[0129] Fig. Figure 11 shows a schematic, axially sectioned structural representation of the bone conduction loudspeaker according to a fourth embodiment of the present invention. A Fig. Figure 11 shows a bone conduction loudspeaker 1100 comprising a drive unit 1101, a transmission assembly 1102, a panel 1103, and an outer housing 1105. The transmission assembly 1102 may include structures such as a vibration transducer, a connecting rod, or a connecting column, etc. The transmission assembly 1102 is connected between the drive unit 1101 and the panel 1103 and serves as a transmission path to transmit the vibrations or driving forces generated by the drive unit 1101 to the panel 1103. In some embodiments, it is necessary for the transmission path to be long because the distance between the panel and the drive unit is considerable. Similarly, it is necessary for the transmission assembly to also be long, and for example, the connecting rod or connecting column to be long.If the transmission arrangement is structurally narrow, its strength is low and it is susceptible to damage from long-term vibrations. Conversely, if the transmission arrangement were structurally thicker to overcome this problem, this would negatively affect the transmission of vibrations and thus the sound quality. In some embodiments, additional reinforcing ribs 1104 may be provided on the surface of the transmission arrangement to increase its strength, thus minimizing the impact on its structure. In some embodiments, the reinforcing rib 1104 may be a flat surface, a protrusion, a strut, etc. The connection methods for the reinforcing rib 1104 to the transmission arrangement 1102 include, but are not limited to: adhesive bonding, welding, hot-melt bonding, or one-piece forming.In some embodiments, it is provided that several reinforcing ribs 1104 may be provided on the surface of the transmission arrangement. For an annular transmission arrangement, the reinforcing ribs may be distributed around the circumference of the transmission arrangement either equidistantly or not equidistantly. A more detailed description of the reinforcing rib can be found in the relevant sections herein (such as the relevant description of...). Fig. 9D or 9E).

[0130] In comparison to other embodiments, the one in Fig. In the bone conduction loudspeaker 1100 shown in Figure 11, it is provided that amplifying ribs 1104 are added to the transmission arrangement so that the frequency for generating the higher order modality of the loudspeaker (that is, vibrations at different points of the loudspeaker are not in agreement) can be increased simultaneously with increasing the strength of the transmission arrangement, thus improving the sound quality of the loudspeaker. Fifth embodiment

[0131] Fig. Figure 12 shows a schematic, axially sectioned structural representation of the bone conduction loudspeaker according to a fifth embodiment of the present invention. As in Fig. As shown in Figure 12, in some embodiments, one end of a first transmission arrangement 1203 of a bone conduction loudspeaker 1200 is connected to a base surface of an outer housing 1202. That is, the entire drive unit is mounted at an angle relative to a panel on the outer housing 1202.

[0132] In particular, the outer casing 1202 and the panel 1201 exhibit high hardness, and the two are either formed as a single piece or connected by a bonding medium with higher stiffness. After the flow of energy, the vibrations generated by the coil 1204 and the vibrations generated by the magnetic circuit arrangement 1207 combine to form vibrations, which are transmitted to the outer casing 1202 and then to the panel 1201. These combined vibrations are then transmitted via the panel 1201 to the skin and bones of the human body, and the bone-conducted sound is heard. Sixth embodiment

[0133] Fig. Figure 13 shows a schematic, axially sectioned structural representation of the bone conduction loudspeaker according to a sixth embodiment of the present invention. As in Fig. As shown in Figure 13, in several embodiments, a bone conduction loudspeaker 1300 comprises: an outer housing 1302, a panel 1301 arranged separately from the outer housing, and a drive unit comprising a first transmission assembly 1303, a coil 1304, a vibration transformer 1305, a second transmission assembly 1306, and a magnetic circuit assembly 1307. The outer housing 1302 comprises a first outer housing 13021 and a third transmission assembly 13022, wherein the first outer housing 13021 is configured as a cuboid with a cavity. In another embodiment, the first outer housing 13021 can also be configured as a sealed circular cylinder or sphere with a cavity or the like. The drive unit is arranged in the cavity. The internal structure of the drive unit can be configured according to any of the above respective embodiments.

[0134] A top surface of the first outer casing 13021 is connected to a top surface of the panel 1301 via the third transmission arrangement 13022, and a bottom surface of the first outer casing 13021 is directly connected to a bottom surface of the panel 1301. The connection types of the first outer casing 13021 to the panel 1301 are not limited to the types described above. For example, the bottom surface of the first outer casing 13021 can also be connected to the bottom surface of the panel 1301 via the third transmission arrangement 13022, and the top surface of the first outer casing 13021 can be directly connected to the top surface of the panel 1301. Alternatively, the first outer casing 13021 can be connected to the panel only via its central section using the third transmission arrangement. The third transmission arrangement can be a structure in the form of a rod, a plate, a hollow cylinder, etc.

[0135] In the present embodiment, the current-energized coil 1304 generates an ampere force in a magnetic field produced by the magnetic circuit arrangement 1307, thereby producing oscillations. The oscillations of the coil 1304 are transmitted via the first transmission arrangement 1303 to the first outer housing 13021. The first outer housing 13021 transmits the oscillations via the third transmission arrangement 13022 or directly to the panel 1301, and the resulting counterforce of the magnetic circuit arrangement 1307 generates further oscillations. The oscillations generated by the magnetic circuit arrangement 1307 are transmitted to the first outer housing 13021 via the connection between the second transmission arrangement 1306 and the vibration transmitter 1305. The first outer housing 13021 transmits the oscillations via the third transmission arrangement 13022 or directly to the panel 1301.The vibrations of coil 1304 and magnetic circuit assembly 1307 are then transmitted via panel 1301 to the skin and bones of the human body, resulting in sound perception. In simpler terms, the vibrations generated by coil 1304 and magnetic circuit assembly 1307 combine to form a single vibration. This combination is first transmitted to the first outer casing 13021 and then directly to panel 1301, or via the third transmission assembly 13022. The combined vibrations are then transmitted via panel 1301 to the skin and bones of the human body, resulting in bone-conducted sound perception. Seventh embodiment

[0136] Fig. Figure 14 shows a schematic, axially sectioned structural representation of the bone conduction loudspeaker according to a seventh embodiment of the present invention. A Fig. The bone conduction loudspeaker 1400 shown in Figure 14 has a first transmission path and a second transmission path that are separate from each other. In particular, the first transmission path comprises a first transmission arrangement 1403, and a transmission arrangement on the second transmission path comprises a vibration transducer 1405 and a second transmission arrangement 1406. The fact that the bone conduction loudspeaker 1400 has a first transmission path and a second transmission path that are separate from each other can be understood to mean that there is no common transmission arrangement on the two transmission paths.

[0137] As in Fig. As shown in Figure 14, a bone conduction loudspeaker 1400 comprises a panel 1401, an outer casing 1402, a first transmission assembly 1403, a coil 1404, a vibration transducer 1405, a second transmission assembly 1406, and a magnetic circuit assembly 1407. The panel 1401 and the outer casing 1402 form a closed or quasi-closed cavity, with a drive unit comprising the first transmission assembly 1403, the coil 1404, the vibration transducer 1405, the second transmission assembly 1406, and the magnetic circuit assembly 1407 located in the cavity. The axis of the drive unit and the normal of the area of ​​the panel that contacts or rests against the user's body form an angle where 0 < θ < 90°. A base surface of the magnetic circuit arrangement 1407 is connected to the vibration transmitter 1405 via the second transmission arrangement 1406 and an outer edge of the vibration transmitter 1405 is connected to the outer housing 1402.For example, the outer edge of the vibration transformer 1405 can be connected either to the bottom surface of the outer housing 1402 or to a side surface of the outer housing 1402. Furthermore, it is also possible that part of the outer edge is connected to the bottom surface of the outer housing 1402 and the other part of the outer edge is connected to a side surface of the outer housing 1402.

[0138] In the present embodiment, the current-energized coil 1404 generates an ampere force in a magnetic field produced by the magnetic circuit arrangement 1407, thereby producing oscillations. These oscillations are transmitted to the panel 1401 via the first transmission arrangement 1403. The opposing force of the magnetic circuit arrangement 1407 also generates oscillations. These oscillations are then transmitted via the second transmission arrangement 1406 and the vibration transducer 1405 to the base and a side surface of the outer housing 1402. The outer housing then transmits the oscillations of the magnetic circuit arrangement 1407 to the panel 1401. Finally, the oscillations of the coil 1404 and the oscillations of the magnetic circuit arrangement 1407 are transmitted via the panel 1401 to the skin and bones of the human body, resulting in the perception of sound.It is understood that, through the direct connection of the vibration transformer to the outer casing 1402 and the flexible connection of the magnetic circuit assembly to the outer casing 1402, the vibrations generated by the magnetic circuit assembly 1407 are transmitted directly to the bottom surface of the outer casing 1402 and one side surface of the outer casing 1402. The vibrations generated by the coil 1404 and the vibrations generated by the magnetic circuit assembly 1407 form composite vibrations and are transmitted to the panel 1401. Subsequently, the composite vibrations are transmitted via the panel 1401 to the skin and bones of the human body, whereby bone-conducted sound is heard. Eighth embodiment

[0139] Fig. Figure 15 shows a schematic, axially sectioned structural representation of the bone conduction loudspeaker according to an eighth embodiment of the present invention. A Fig. The bone conduction loudspeaker 1500 shown in Figure 15 uses a structure with two vibration transformers, which gives the low-frequency range of the loudspeaker's vibration response curve an additional peak, making the loudspeaker's low-frequency response more sensitive and thus improving sound quality. As shown in Figure 15, the bone conduction loudspeaker 1500 uses a structure with two vibration transformers, resulting in an additional peak in the low-frequency range of the loudspeaker's vibrations. Fig. As shown in Figure 15, a bone conduction loudspeaker 1500 comprises, in particular, a panel 1501, an outer housing 1502, a first transmission arrangement 1503, a coil 1504, a first vibration transformer 1505, a second vibration transformer 1506, a second transmission arrangement 1507, and a magnetic circuit arrangement 1508. The connection types between the panel 1501, the first transmission arrangement 1507, the first vibration transformer 1505, the second transmission arrangement 1507, and the magnetic circuit arrangement 1508 are the same as those shown in Figure 15. Fig. 9 connection types shown, see in particular Fig. 9. An edge of the second vibration transmitter 1506 is connected to an open end face of the outer housing 1502. The first transmission assembly 1503 passes through a central section of the second vibration transmitter 1506 and is rigidly connected to it. A central axis plane of the second vibration transmitter 1506 is latched to a solid cylinder of the first transmission assembly 1503.

[0140] The operating principle of the bone conduction loudspeaker 1500 in the present embodiment is as follows. The current-energized coil 1504 generates an ampere force in a magnetic field generated by the magnetic circuit arrangement 1508, thereby producing vibrations. The vibrations of the coil 1504 are transmitted directly to the panel 1501 via the first transmission arrangement 1503, and vibrations are generated by the opposing force of the magnetic circuit arrangement 1508. The vibrations generated by the magnetic circuit arrangement 1508 are transmitted to the panel 1501 via the second transmission arrangement 1507 and the first vibration transformer 1505, and the vibrations of the outer housing 1502 are transmitted to the panel 1501 via the second vibration transformer. Afterwards, the vibrations of the coil 1504 and the vibrations of the magnetic circuit arrangement 1508 are transmitted via the panel 1501 to the skin and bones of the human body, so that sound can be heard.It is understood that the second vibration transmitter 1506 provides a smooth connection between the panel 1501 and the outer casing 1502. Furthermore, the vibrations generated by the coil 1504 and those generated by the magnetic circuit arrangement 1508 combine to form a single vibration, which is then transmitted to both the panel 1501 and the outer casing 1502. These combined vibrations are then transmitted via the panel 1501 to the skin and bones of the human body, resulting in bone-conducted sound. Ninth embodiment

[0141] Fig. Figure 16 shows a schematic, axially sectioned structural representation of the bone conduction loudspeaker according to a ninth embodiment of the present invention. As in Fig. Figure 16 shows that in another embodiment, a bone conduction loudspeaker 1600 comprises a panel 1601, an outer housing 1602, and two drive units 1605 and 1606. The panel 1601 and the outer housing 1602 form a closed or quasi-closed cavity, with the two drive units 1605 and 1606 located within this cavity. The drive units in the present embodiment are the same as those in the respective embodiments of the present invention described above. The drive unit 1605 is connected to the panel 1601 via a first transmission arrangement 1603. The drive unit 1606 is connected to a partition plate located in the cavity via a second transmission arrangement 1604. Furthermore, there is a specific angle between the drive unit 1605 and the drive unit 1606.In another embodiment, the drive unit 1606 can be directly connected to the panel or the outer housing via the second transmission arrangement 1604, which is angled at a right angle. It should be noted that in another embodiment, the axis of the drive unit 1605 need not be parallel to the normal of the panel, and the axis of the drive unit 1606 need not be perpendicular to the normal of the panel. Instead, the two drive units are positioned relative to the panel such that the straight line carrying the direction of any resultant force from the drive forces generated thereby lies, and the normal of the area on the panel used for contact with or bearing against the user's body, form the angle θ, where 0 < θ < 90°. It is further understood that three, four, or more drive units may also be provided.The positions of the respective drive devices in the cavity are adjusted such that the straight line on which the direction of a resultant force from the drive forces generated by the respective drive devices lies, and the normal of the area on the panel used for contact with or attachment to the user's body, represent the angle θ, where 0<θ<90°.

[0142] In the present embodiment, the driving force of the drive unit 1605 is parallel to the normal of the area on the panel used for contact with or contact with the user's body, and the driving force of the drive unit 1606 is perpendicular to the normal of the area on the panel used for contact with or contact with the user's body. The two drive units are set into vibration simultaneously, and the two vibrations are transmitted to the panel, so that combined vibrations are transmitted via the panel 1601 to the skin and bones of the human body, and the bone-conducted sound is heard.

[0143] The present invention further provides a bone conduction earphone. During use, a bone conduction loudspeaker is attached to a specific location (for example, the head) of the user by means of an earphone holder / earphone headband to provide a clamping force between a vibrating unit and the user. A contact surface is connected to the drive unit and is in contact with the user to transmit sound to the user by means of vibrations. If the bone conduction loudspeaker is designed as a symmetrical structure and it is assumed that the drive forces supplied by the drive units on both sides during operation are equal and opposite, a position at the center of the earphone holder / earphone headband can be chosen as an equivalent attachment end. If the bone conduction loudspeaker can provide stereo acoustics, i.e.,If the instantaneous driving forces supplied by the energy transducers at both points are not equal, or if the bone conduction loudspeaker is structurally asymmetrical, another point or area on or outside the earphone holder / earphone headband can serve as an equivalent mounting end. The mounting end mentioned here can be considered the equivalent mounting end of the bone conduction loudspeaker, whose position is relatively fixed during vibrations. The mounting end is connected to the vibrating unit via the earphone holder / earphone headband, and the transmission ratio depends on the earphone holder / earphone headband, the clamping force supplied by the earphone holder / earphone headband, and the physical properties of the earphone holder / earphone headband.By varying the clamping force provided by the earphone holder / earphone arm, the mass of the earphone holder / earphone arm, and other physical quantities, the sound transmission efficiency of the bone conduction loudspeaker can preferably be changed, thus influencing the frequency response of a system within a specific frequency range. For example, different clamping forces can be achieved by using an earphone holder / earphone arm made of high-strength materials versus one made of low-strength materials. Alternatively, the clamping force can also be altered by changing the structure of the earphone holder / earphone arm or by adding an auxiliary device capable of providing an elastic force to the earphone holder / earphone arm, thereby influencing the sound transmission efficiency.Changing the dimensions of the earphone holder / earphone arm while wearing it can also affect the size of the clamping force, with the clamping force increasing with the increase in the distance between the vibration units at both ends of the earphone holder / earphone arm.

[0144] To obtain an earphone holder / earphone hook that meets a specific clamping force requirement, average professionals in this field can, depending on the actual situation, select earphone holders / earphone hooks made of materials with different stiffnesses or modules, or adjust the dimensions or size of the earphone holder / earphone hook. It should be noted that the clamping force of the earphone holder / earphone hook can influence not only the sound transmission efficiency but also the user's listening experience in the bass frequency range. The clamping force mentioned here is a pressure force between the contact surface and the user. Preferably, the clamping force is between 0.1 N and 5 N, more preferably between 0.2 N and 4 N, further preferably between 0.2 N and 3 N, still more preferably between 0.2 N and 1.5 N, and even more preferably between 0.3 N and 1.5 N.

[0145] It should be noted that the respective embodiments of the bone conduction loudspeakers described above are only examples. The components and configurations listed in these embodiments do not limit the present invention. The components, shapes, configurations, and their connection types in these embodiments can be combined with one another. For example, the components described in Fig. 11 shown reinforcing ribs for any one in Fig. The embodiment shown in Figures 9 to 16 is suitable. The first transmission arrangement 903 of the bone conduction loudspeaker 900a in Fig. 9 can also be connected to the panel and the outer housing simultaneously, just like the first transmission arrangement 1003 of the bone conduction loudspeaker 1000. It can also be connected to the rear of the outer housing, just like in the bone conduction loudspeaker 1200.

[0146] Fig.Figure 17 shows a flowchart of a method for adjusting the bone conduction loudspeaker according to the present invention. A sequence 1700 represents a specific embodiment according to the present invention and relates to the steps included for adjusting the bone conduction loudspeaker.

[0147] In step 1710, a panel is connected to a drive unit. In some embodiments, the drive unit can be connected to the panel using transmission arrangements, such as a vibration transmitter, a connecting element, or the like. In addition to its structural connection function, the transmission arrangement also serves to transmit vibrations. Specifically, the drive unit comprises a coil and a magnetic circuit arrangement. The vibrations of the coil and the magnetic circuit arrangement can be transmitted to the panel and / or the outer casing via various paths. For example, the vibrations of the coil can be transmitted to the panel and / or the outer casing via a first transmission path. The vibrations of the magnetic circuit arrangement can be transmitted to the panel and / or the outer casing via a second transmission path.The first transmission path can comprise a first transmission assembly, and the second transmission path can comprise a second transmission assembly, a vibration transformer, and the first transmission assembly. The first transmission assembly can be a connecting column or a connecting rod. The second transmission assembly can also be a connecting column or a connecting rod.

[0148] In some embodiments of the bone conduction loudspeaker, the transmission arrangement connecting the panel to the drive unit allows the vibrations generated by the drive unit to be transmitted to the panel. When the panel is placed against the human body, the vibrations are then transmitted to the human body. This connection between the panel and the drive unit enables the effective transmission of a vibration signal generated by the drive unit, allowing the human body to receive the signal. In some embodiments, the panel, the transmission arrangement, and the drive unit are typically made of rigid materials and are rigidly connected to each other to improve the quality of audio signal transmission.

[0149] In step 1720, the position of the drive unit relative to the panel can be adjusted so that a straight line along which a driving force generated by the drive unit is located is not parallel to the normal of the panel. In particular, the position of the drive unit relative to the panel can be adjusted according to the positions of the respective embodiments described above. The design of the transmission arrangement can be modified by the adjustment methods used. For example, the transmission arrangement is designed so that one side is lower than the other to ensure that the straight line along which the driving force is located is not parallel to the normal of the panel. Alternatively, the design of the panel or the outer housing is improved to solve this technical problem.For example, a platform inclined towards the panel is arranged in the outer housing, and the drive unit is arranged on the platform. Alternatively, the drive unit is arranged horizontally in the outer housing, while the panel is inclined to cover the outer housing. Any such arrangement is suitable for the present invention, provided that the drive unit is arranged inclined relative to the panel such that the straight line along which the driving force is directed is not parallel to the normal of any area on the panel used for contact with or bearing against the user's body. The present invention is not limited thereto.

[0150] It should be noted that the two steps described above do not necessarily have a fixed order when setting up the bone conduction speaker, and the order of the two can be reversed. In some embodiments, the two steps described above are also not entirely separate processes. That is, the two steps can be performed simultaneously. For example, while connecting the drive unit to the panel, the relative position of the two can be adjusted at the same time.

[0151] The basic concepts have been described above. Naturally, the above disclosure of the invention is provided to the person skilled in the art only as an example, without limiting the application. Although not explicitly stated, a person skilled in the art may make various modifications, improvements, and changes to the application. These modifications, improvements, and changes are indicated in the application so that they are still within the spirit and scope of the exemplary embodiments presented in the application.

[0152] The present application also uses specific terms to describe embodiments of the present application. The terms "an embodiment" and / or "some embodiments" refer to a feature, structure, or special characteristic associated with at least one embodiment of the present application. It should therefore be emphasized and noted that the terms "an embodiment" or "an alternative embodiment," which appear two or more times in different places in the present description, do not necessarily refer to the same embodiment. Furthermore, some features, structures, or properties of one or more embodiments of the present application can be appropriately combined with one another.

[0153] Furthermore, a person skilled in the art in this field can understand that the aspects of the present application can be explained and described by several patentable categories or situations, including any new and meaningful combinations of operations, machines, products, or substances, as well as any new and meaningful improvements thereto. Accordingly, the various aspects of the present application can be implemented entirely by hardware, entirely by software (including firmware, resident software, microcode, etc.), or by a combination of hardware and software. Both hardware and software can be referred to as a "data block," "module," "engine," "unit," "arrangement," or "system." Furthermore, the aspects of the present application can manifest themselves as a computer product on one or more computer-readable media, the product comprising computer-readable program code.

[0154] Furthermore, unless expressly stated otherwise in the claims, neither the order of the processing elements and sequences nor the use of numbers, letters, or other designations in the present application is used to restrict the order of the processes and methods of the present application. Although the above disclosure has discussed some embodiments of the invention currently considered useful by way of various examples, it should be understood that such details serve only for illustration and that the attached claims are not limited to the disclosed embodiments. Rather, the claims are intended to cover all modifications and equivalent combinations that are consistent with the nature and scope of the embodiments of the present application.Although the system arrangements described above can be implemented using hardware devices, for example, they can also be implemented using software solutions, such as by installing the described systems on existing servers or mobile devices.

[0155] It should also be noted that in the preceding description of the embodiments of the present application, various features are sometimes grouped together in one embodiment, one figure, or its description(s) in order to simplify the description of the disclosure of the present application and to facilitate the understanding of one or more embodiments of the invention. However, this method of disclosure does not mean that the subject matter of the present application requires more features than those specified in the claims. In fact, the embodiments have fewer features than the totality of features of the individual embodiments disclosed above.

[0156] In some embodiments, numerical values ​​are used to describe the components and properties. It should be understood that in some cases, these values ​​are further specified using terms like "approximately," "about," or "essentially," etc. Unless otherwise stated, "approximately," "about," or "essentially" indicate that the stated number allows for a variation of ±20%. Accordingly, in some embodiments, the numerical data used in the description and claims are approximate values ​​that may vary depending on the requirements of the specific embodiment. In some embodiments, the required number of significant decimal places for the numerical data is to be taken into account using a general rounding procedure.Although the numerical ranges and data in some embodiments of the present application for determining the width of the associated perimeter are approximate values, such values ​​have been determined as precisely as possible within the practical scope in the specific embodiments.

[0157] In conclusion, it should be understood that the embodiments described in this application serve only to illustrate the principle of the embodiments described therein. Other variants could also fall within the scope of this application. Therefore, alternative configurations of the embodiments described in this application may be considered exemplary and not as limiting, as being consistent with the teachings of this application. Accordingly, the embodiments described in this application are not limited to those expressly presented and described herein.

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