CN116389961A - Bone conduction loudspeaker and earphone - Google Patents

Abstract

The invention discloses a bone conduction speaker and an earphone, wherein the bone conduction speaker comprises: the device comprises a shell, wherein a containing cavity is arranged in the shell, first magnetic steel and a first coil are installed in the containing cavity, and the first magnetic steel and the first coil form a transduction device for converting an audio signal into a vibration signal; a damping diaphragm fixed on the shell, wherein the damping diaphragm is configured to vibrate under the drive of the transduction device; and the vibration conduction piece is connected with the damping vibrating diaphragm and is used for conducting vibration signals of the damping vibrating diaphragm. Compared with the prior art, the damping diaphragm is adopted to transfer the vibration of the coil, so that the vibration amplitude is small, the vibration power is high, and the low-frequency and high-frequency sound signals can be responded.

Description

Bone conduction loudspeaker and earphone

Technical Field

The invention relates to the technical field of bone conduction headphones, in particular to a bone conduction speaker and a bone conduction headphone.

Background

Bone conduction headphones are headphones that convert sound into mechanical vibrations of different frequencies, transmitting sound waves through the skull, bone labyrinth, inner ear lymph fluid transfer, augers, acoustic nerves, auditory centers of a person. Compared with the classical sound conduction mode of generating sound waves through a vibrating diaphragm, the method omits a plurality of sound wave transmission steps, can realize clear sound restoration in a noisy environment, and can not influence others due to diffusion in air; thereby being more and more popular with the vast population.

However, conventional bone conduction headphones are often poor in sound quality, especially in bass sounds.

Accordingly, there is a need for improvement and advancement in the art.

Disclosure of Invention

The invention mainly aims to provide a bone conduction loudspeaker which aims to solve the problem that the conventional bone conduction earphone is poor in tone quality.

In order to achieve the above object, a first aspect of the present invention provides a bone conduction speaker comprising:

the device comprises a shell, wherein a containing cavity is arranged in the shell, first magnetic steel and a first coil are installed in the containing cavity, and the first magnetic steel and the first coil form a transduction device for converting an audio signal into a vibration signal;

the first damping vibrating diaphragm is connected to the shell and is configured to vibrate under the drive of the transduction device;

and the vibration conduction piece is connected with the first damping vibrating diaphragm and is used for conducting vibration of the first damping vibrating diaphragm.

Optionally, at least one second magnetic steel is arranged in the first coil.

Optionally, a support frame is arranged on the first magnetic steel, a second damping vibrating diaphragm is installed on the support frame, a second coil is fixed on the second damping vibrating diaphragm, and the second coil and the first magnetic steel form a gas-guide transduction device.

Optionally, a third coil, a third damping diaphragm and a third magnetic steel are arranged above the first damping diaphragm in the shell, and the third coil, the third damping diaphragm and the third magnetic steel form a gas-guide transduction device.

Optionally, the air conduction transduction device is provided with a plurality of air conduction transduction devices, and the directions of the third damping diaphragms are different.

Optionally, a plurality of gas guide transduction component brackets are arranged above the first damping vibrating diaphragm in the shell, and a gas guide transduction component for gas guide sounding is fixed on the gas guide transduction component brackets.

Optionally, a magnetic line baffle is arranged between the air conduction transduction component and the air conduction transduction component bracket.

Optionally, the shell is provided with a sound hole.

Optionally, at least two kinds of first coils are arranged in the shell, the first coils are connected with the first damping diaphragm, and the first coils are respectively configured to respond to audio signals in different frequency bands.

Optionally, the vibration conducting member is connected to the first damping diaphragm portion.

Optionally, the thickness of the first damping diaphragm is 1.5 micrometers to 2 millimeters.

A second aspect of the present invention provides an earphone comprising: the bone conduction speaker comprises a earphone frame and a speaker, wherein the speaker is fixed on the earphone frame, and the speaker is any one of the bone conduction speakers.

From the above, according to the bone conduction speaker disclosed by the invention, the accommodating cavity is formed in the shell, the transduction device consisting of the magnetic steel and the coil is arranged in the accommodating cavity, the damping vibrating diaphragm is adopted to transmit the vibration of the coil to the vibration conduction piece, and the vibration is transmitted to the vicinity of the ear of a person through the vibration conduction piece. Compared with the prior art, the damping vibrating diaphragm is adopted to transfer the vibration of the coil, so that the vibration amplitude is small, the vibration power is high, and the damping vibrating diaphragm can respond to low-frequency and high-frequency sound signals, and has good sound quality effect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a moving coil bone conduction speaker according to an embodiment of the present invention;

fig. 2 is a first schematic diagram of a moving-magnet bone conduction speaker according to an embodiment of the present invention;

fig. 3 is a second schematic diagram of a moving-magnet bone conduction speaker according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a moving-coil dual-magnetic-steel bone conduction speaker according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a moving-magnet type dual-magnet steel bone conduction speaker according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a moving-coil bone conduction and rear-cavity moving-coil (split) air conduction speaker according to an embodiment of the present invention;

fig. 7 is a schematic diagram of a moving-coil bone conduction and front-cavity moving-coil (split) air conduction speaker according to an embodiment of the present invention;

fig. 8 is a schematic diagram of a moving-coil bone conduction and front-cavity moving-coil (assembly) air conduction speaker according to an embodiment of the present invention;

fig. 9 is a schematic diagram of a dual moving coil bone conduction speaker according to an embodiment of the present invention;

fig. 10 is a schematic diagram of an earphone according to an embodiment of the present invention.

Description of the reference numerals

10. The air conduction transducer comprises a shell, 11, a fixing piece, 12, a flexible supporting piece, 13, an air conduction transducer support, 14, a front cavity, 15, a rear cavity, 20, a transducer, 21, first magnetic steel, 22, a first coil, 23, second magnetic steel, 24, a second coil, 25, a support frame, 26, third magnetic steel, 27, a third coil, 30, a first damping diaphragm, 31, a second damping diaphragm, 32, a third damping diaphragm, 40, a vibration conducting piece, 50, a sound hole, 60, an earphone frame, 70, a bone conduction loudspeaker, 80 and an air conduction transducer.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.

As used in this specification and the appended claims, the term "if" may be interpreted in context as "when …" or "upon" or "in response to a determination" or "in response to detection. Similarly, the phrase "if a condition or event described is determined" or "if a condition or event described is detected" may be interpreted in the context of meaning "upon determination" or "in response to determination" or "upon detection of a condition or event described" or "in response to detection of a condition or event described".

The following description of the embodiments of the present invention will be made more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown, it being evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.

In describing the bone conduction related art in the present invention, a description of "bone conduction speaker" or "bone conduction earphone" will be employed. The description is only one form of bone conduction application, and it will be understood by those of ordinary skill in the art that the "speaker" or "earphone" may be replaced by other similar words, such as "player," "hearing aid," "transducer," "receiver," "speaker," etc. Indeed, various implementations of the invention may be readily applied to other non-speaker-like hearing devices.

Bone conduction is a mechanical vibration that converts sound into different frequencies, transmitting sound waves through the skull, bone labyrinth, inner ear lymph fluid transfer, augers, acoustic nerves, auditory centers of humans. Compared with the classical sound gas conduction mode of generating sound waves through a vibrating diaphragm, the method omits a plurality of sound wave transmission links, can realize clear sound restoration in a noisy environment, and can not influence others due to diffusion in air; thereby being more and more popular with the vast population.

Bone conduction speakers are mainly divided into an axial bone conduction speaker and a non-axial bone conduction speaker, wherein the axial bone conduction speaker is provided with a plurality of fingers, and coils are arranged on the axial bone conduction speaker, so that the coils need larger pushing force to vibrate to form sound signals. The magnetic steel is fixed on the first structure in the first mode, the coil is in soft connection with the second structure, after the acoustic electric signal is applied to the coil, the coil generates an electromagnetic signal which changes along with the acoustic electric signal, and the changing electromagnetic signal causes an interaction force which changes along with the acoustic electric signal to be generated between the coil and the magnetic steel, so that the magnetic steel fixed on the first structure applies a reaction force to the coil, and further pushes the coil and a vibration transmission structure fixed with the coil; the second mode is to fix the coil on the first structure, the magnetic steel is in soft connection with the second structure, after the acoustic electric signal is applied to the coil, the coil generates an electromagnetic signal which changes along with the acoustic electric signal, and the changing electromagnetic signal leads to an interaction force which changes along with the acoustic electric signal between the coil and the magnetic steel, so that the coil fixed on the first structure applies a reaction force to the magnetic steel and further pushes the magnetic steel and a vibration transmission structure fixed with the magnetic steel.

The existing bone conduction speaker mainly adopts an axial vibration piece to transfer the vibration of a coil, and the frequency response range of the bone conduction speaker is mainly concentrated between 200 KHZ and 3KHZ due to the strong rigidity and unbalanced vibration of the existing vibration piece, and the frequency response range is small and the high and low frequency parts are missing.

In order to solve the technical problems, the invention provides a bone conduction loudspeaker, which adopts a damping vibrating diaphragm to transfer the vibration of a coil or magnetic steel, and has high vibration transmission efficiency, high vibration power and wide frequency response.

Example 1

As shown in fig. 1, the bone conduction speaker of the present embodiment includes a housing 10, a transducer 20 and a vibration conducting member 40, wherein the shape of the housing 10 is not limited, and may be circular, elliptical or polygonal, and the material of the housing 10 is hard, preferably made of fiber reinforced plastic material, and has high rigidity and light weight. The housing 10 has a receiving chamber therein, which may or may not be closed.

The transduction device 20 is a moving coil transduction device, and comprises a first magnetic steel 21 and a first coil 22, which are both arranged in the accommodating cavity. Specifically, the first magnetic steel 21 is fixed at the bottom of the accommodating cavity, the first coil 22 is suspended and installed around the periphery of the first magnetic steel 21, and a magnetic gap is formed between the first coil 22 and the first magnetic steel 21. The first magnetic steel 21 can provide a preset magnetic field. Specifically, after the first coil 22 is connected to the acoustic electric signal, the first coil 22 generates an electromagnetic signal that varies with the acoustic electric signal, and based on the preset magnetic field of the first magnetic steel 21, the varying electromagnetic signal causes an interaction force between the first coil 22 and the first magnetic steel 21 that varies with the acoustic electric signal, so that the first magnetic steel 21 fixed on the housing 10 applies a reaction force to the first coil 22 to push the first coil 22 to generate vibration, and the first coil 22 transmits the vibration to the first damping diaphragm 30.

Alternatively, the transduction means of the transduction device 20 may be: moving coil type and moving magnetic type. The transducer in fig. 1 is a moving coil type.

In some embodiments, as shown in fig. 2, the transduction device is a moving magnet type, the first coil 22 is fixed at the bottom of the accommodating cavity, and the first magnetic steel 21 is suspended and fixed above the first coil 22 and provides a preset magnetic field. After the first coil 22 is connected with the acoustic electric signal, an electromagnetic signal which changes along with the acoustic electric signal is generated; on the basis of the preset magnetic field of the first magnetic steel 21, the changing electromagnetic signal causes interaction force which changes along with acoustic electric signals to be generated between the first coil 22 and the first magnetic steel 21, and the first coil 22 fixed on the shell 10 applies reaction force to the first magnetic steel 21 to push the first magnetic steel 21 to vibrate so as to convert the audio signal into vibration.

The audio signal may include an audio file or data or file that may be converted into sound by a specific way; may come from one signal source or multiple signal sources.

The existing bone conduction speaker is mainly connected with a coil through a vibrating piece made of rigid materials, so that vibration of the coil is amplified and conducted to the vibrating piece. The expansion and contraction of the vibration plate, the fold deformation, the size, the shape, the fixing mode, etc. have an influence on the sound quality of the bone conduction speaker. The existing vibrating reed has strong rigidity and unbalanced vibration, so that the frequency response range of the bone conduction speaker is mainly concentrated between 200 and 3KHZ, the frequency response range is small, and the high and low frequency parts are absent.

Therefore, this embodiment uses the abundant frequency response capability of the traditional loudspeaker as a reference, and adopts the first damping diaphragm 30 as the vibrating piece, and the problem that the existing elastic piece cannot well represent the frequency response below 200HZ and above 3KHZ can be overcome by vibrating or sounding the first damping diaphragm 30. The first damping diaphragm 30 may be made of: one or more of metal alloy vibrating diaphragm, ceramic vibrating diaphragm, silk membrane, rubber membrane, cone vibrating diaphragm, plastic vibrating diaphragm, synthetic fiber vibrating diaphragm (carbon fiber vibrating diaphragm, bulletproof cloth vibrating diaphragm, glass fiber vibrating diaphragm, acrylic vibrating diaphragm) and the like, and thicken and harden the first damping vibrating diaphragm 30, so that the first damping vibrating diaphragm 30 has certain toughness and hardness, can vibrate for a long time, and prolongs the service life of the bone conduction speaker. The thickness of the first damping diaphragm 30 is: 1.5 micrometers to 2 millimeters. Compared with a rigid vibrating piece, the first damping vibrating diaphragm 30 can generate larger amplitude under the same input energy, so that the bone conduction speaker realizes higher sensitivity, and the output power and efficiency of vibration are improved.

The first damping diaphragm 30 is generally annular, and may have various shapes such as a circle and a polygon. Referring to fig. 1, 2 and 3, the first damping diaphragm 30 is attached to the housing 10, such as by being bonded to a side wall of the housing 10 or attached to the housing 10 by a flexible support 12. Alternatively, the first damping diaphragm 30 may be integrally formed on the diaphragm support by spraying glue, thermoforming, or the like, and then the diaphragm support is fixed on the housing 10 by means of bonding, clamping, riveting, screwing, or the like. In this embodiment, the first damping diaphragm 30 shown in fig. 1 is installed in a housing, an opening through which the vibration conducting member 40 passes is provided at the top end of the housing 10, and the top wall of the housing 10 is slightly lower than the vibration conducting member 40, so that the first damping diaphragm 30 can be protected, but the housing 10 and the vibration conducting member 40 need to be in soft connection, for example, a silica gel (a secondary injection molding process or a post-mounting process) is provided at a contact position between the housing 10 and the vibration conducting member 40, and the soft connection is realized by abutting the silica gel on the vibration conducting member 40, so as to reduce the influence on the vibration transferred by the vibration conducting member 40. Preferably, the thickness of the vibration conductive member 40 is set to: after being worn, the vibration conducting piece 40 is still slightly higher than the surface of the surrounding shell 10 after being pressed and depressed by the skin of a user, so that the positioning and vibration transmission of the vibration transmitting piece are facilitated.

It is easy to understand that the first damping diaphragm 30 may be installed at the edge of the receiving cavity opening as shown in fig. 2 and 3, and the side wall of the housing 10 is slightly higher than the first damping diaphragm 30, so that the process is simple, and the vibration transmission of the vibration conducting member 40 is not affected. The shape, size, and proportion of the first damping diaphragm 30 are not limited in practical application, and those skilled in the art can make a certain change according to what is described in the drawings, considering factors affecting the sound quality of the bone conduction speaker, such as the degree of leakage of the bone conduction speaker, the frequency multiplication sound generated, the wearing mode, etc.

Referring to the moving coil earphone shown in fig. 1, the first coil 22 is fixed to the lower end surface of the first damping diaphragm 30, and the vibration conducting member 40 is connected to the upper end surface of the first damping diaphragm 30, and when the first coil 22 vibrates, the vibration of the first coil 22 is conducted to the first damping diaphragm 30 and is conducted to the vibration conducting member 40 through the first damping diaphragm 30. The vibration conducting member 40 may be one or more members, and the vibration conducting member 40, the first coil 22 and the first damping diaphragm 30 may be fixed by direct or indirect means. For the moving magnetic earphone shown in fig. 2, the first magnetic steel 21 presets a magnetic field, and after the first coil 22 is connected with an acoustic electric signal, an electromagnetic signal which changes along with the acoustic electric signal is generated; on the basis of the preset magnetic field of the first magnetic steel 21, the changed electromagnetic signal causes the first coil 22 and the first magnetic steel 21 to generate interaction force which changes along with the acoustic electric signal; since the first coil 22 is fixed on the housing 10, the first magnetic steel 21 vibrates due to the interaction force, so that the first magnetic steel 21 drives the first damping diaphragm 30 to vibrate.

In this embodiment, the vibration conductive member 40 forms one vibration conductive layer, which may be made of one or more materials, or may be a plurality of vibration conductive layers, and the material composition of different vibration conductive layers may be the same or different. The vibration conducting layer can be made of silica gel, plastic rubber or metal. The greater the hardness of the vibration conductive layer, the higher the efficiency of transmitting high frequency; the smaller the mass of the vibration conducting layer, the higher the transfer efficiency. Different sound quality and transmission efficiency can be achieved by selecting different materials and masses of the vibrating conductive layer. The vibration conducting layer and the first damping diaphragm 30 may be connected and fixed in any manner such as bonding, clamping, threaded connection, etc. The vibration conducting layer can change the frequency response characteristic and the vibration transmission efficiency of the bone conduction speaker, improve the tone quality of the bone conduction speaker, and simultaneously play a role in protecting elements in the shell. The first damping diaphragm 30 may be partially or entirely bonded to the vibration conductive member 40; the first damping diaphragm 30 corresponds to a diaphragm of bone conduction and also corresponds in part to a diaphragm of air conduction.

Alternatively, the vibration conducting member 40 may be a panel for fitting to the skin of a user, the panel being made of plastic (such as, but not limited to, ABS, PC, PP, nylon, etc., engineering plastic), rubber, metal, or other single or composite materials capable of achieving the same. The faceplate may be coupled to the vibration conducting member 40 by means of a socket, adhesive, or the like.

Alternatively, the vibration conducting member 40 may also include both a vibration conducting layer and a panel, the vibration conducting layer being located between the damping diaphragm and the panel, and the mechanical vibration being transmitted to the panel via the vibration conducting layer and then transmitted to the auditory nerve via the skin and bone of the user by the panel, so that the human body can hear the sound.

Through changing current rigidity trembler into elasticity damping vibrating diaphragm, both can keep bone conduction's function, still have the advantage of air conduction concurrently, can be fine the frequency response below 200HZ and above 3KHZ that shows, the tone quality of output is good and the amplitude is big, power is big, efficient. Since the first damping diaphragm 30 can output a larger power even when vibrating with a small amplitude, compared with the conventional vibrating reed, the vibration damping diaphragm not only can obtain a richer frequency response capability, but also has the advantages of high vibration efficiency and high vibration power.

Example two

On the basis of the first embodiment, as shown in fig. 4, in order to increase the vibration power, in this embodiment, at least one second magnetic steel 23 is further fixed in the first coil 22, and a static magnetic field is preset between the first magnetic steel 21 and the second magnetic steel 23, so that the first coil 22 can provide a larger power output when vibrating. Specifically, the second magnetic steel 23 is supported on a connecting member (not shown) connected to the inner wall of the housing, or on the first damping diaphragm 30. When the second magnetic steel 23 is supported on a connecting piece connected with the inner wall of the shell, the first coil 22 generates an electromagnetic signal which changes along with the acoustic electric signal after being connected with the acoustic electric signal, and generates interaction force with a preset static magnetic field, so that the first damping vibrating diaphragm 30 is driven to vibrate. When the second magnetic steel 23 is connected to the first damping diaphragm 30, the first coil 22 generates an electromagnetic signal which changes along with the acoustic electric signal after being connected to the acoustic electric signal, and generates an interaction force with a preset static magnetic field, so as to drive the first damping diaphragm 30 and the second magnetic steel 23 to vibrate. In the embodiment, a static magnetic field is preset between the second magnetic steel 23 and the first magnetic steel 21, and in the embodiment, the static magnetic field is preset through the first magnetic steel 21; compared with the first embodiment, the second embodiment can configure the first magnetic steel 21 and the second magnetic steel 23 to have the same magnetic poles in opposite directions, that is, according to the assembly relationship of fig. 4, a preset repulsive force exists between the first magnetic steel 21 and the second magnetic steel 23, and the preset repulsive force can fully or partially counteract static deformation/displacement, which is transmitted to the first damping diaphragm 30 from extrusion between the skin of a user and the vibration conducting member 40 when the earphone is worn, so as to further improve transmission efficiency and power. The structure shown in fig. 4 forms a moving coil double magnetic steel.

Alternatively, referring to fig. 5, double magnetic steels can be designed on the basis of the moving magnetic structure shown in fig. 2 to form moving magnetic double magnetic steels, so that vibration power can be increased as well, and higher sensitivity can be realized.

In the embodiment shown in fig. 1 to 5, the first damping diaphragm 30 is located near the vibration conducting member 40, and forms a cavity (referred to as a front cavity) with the housing 10 and the vibration conducting member 40; the first damping diaphragm 30 is close to one side of the first magnetic steel 21, and forms a cavity (back cavity for short) with the inner wall of the casing 10. Optionally, at least one sound hole 50 is formed on a side wall or a top wall of the housing 10 of the front cavity 14, and the sound hole 50 is configured to adjust a sound pressure parameter of the front cavity, so as to improve acoustic characteristics. At least one sound hole 50 is formed in a side wall or a bottom wall of the housing 10 of the rear cavity 15, and the sound hole 50 is configured to adjust a sound pressure parameter of the rear cavity 15 to improve acoustic characteristics.

Example III

In order to fully combine the advantages of bone conduction and air conduction, the first embodiment is further improved, as shown in fig. 6, in which the support frame 25 is directly mounted on the first magnetic steel 21, and the second damping diaphragm 31 is mounted on the support frame 25. The second coil 24 is fixed on the second damping diaphragm 31 and is disposed opposite to the first magnetic steel 21. The second damping diaphragm 31 and the second coil 24 are matched with the first magnetic steel 21 to form an air conduction transduction device. After the second coil 24 is connected with the acoustic electric signal, an electromagnetic signal which changes along with the acoustic electric signal is generated, and an interaction force is generated between the electromagnetic signal and a static magnetic field preset by the first magnetic steel 21, so that the second damping diaphragm 31 is driven to vibrate to generate a sound signal. Since the second damping diaphragm 31 is used to generate sound waves (air-conduction sound), and the first damping diaphragm 30 has a vibration transmission member, the thickness of the second damping diaphragm 31 is thinner than that of the first damping diaphragm 30, and the thinnest thickness may be 1 μm.

A cavity (back cavity for short) formed by the first damping diaphragm 30, which is close to one side of the first magnetic steel 21, and the inner wall of the shell 10; at least one sound hole 50 is formed in a side wall or a bottom wall of the housing 10 of the rear cavity 15, and the sound hole 50 is configured to adjust a sound pressure parameter of the rear cavity 15 to improve acoustic characteristics.

When the air-guide transduction device is provided in the case 10, the sound holes 50 enable sound generated from the second damping diaphragm 31 in the air-guide transduction device to be transmitted from the sound holes 50 to the outside of the speaker. In use, the wearer of the earphone/speaker can obtain sound signals in a bone conduction manner, can obtain sound signals in an air conduction manner, can adjust sound pressure parameters in the housing 10, and improves acoustic characteristics. Preferably, the sound hole is further attached with a tuning net/dust-proof net at one side inside the case 10, so that acoustic parameters of the transmitted sound can be adjusted, and dust and water can be prevented.

Optionally, the sound hole 50 may be further configured to adjust the sound pressure parameter of the rear cavity 15, improving the acoustic properties.

Optionally, a magnetic steel may be connected to the lower end surface of the first damping diaphragm 30 in the first coil 22, so as to improve transmission efficiency and power.

The mounting position of the support frame 25 is not limited, and may be directly fixed to the bottom wall of the housing 10 (not shown in fig. 6), so long as the axes of the second coil 24 and the second damping diaphragm 31 are coincident with the axis of the first magnetic steel 21.

Example IV

In order to fully combine the advantages of bone conduction and air conduction, as shown in fig. 7, a further modification of the second embodiment is to provide an air conduction transducer in a cavity (referred to as a front cavity) formed by the vibration conducting member 40 and the inner wall of the housing 10. Specifically, the air conduction transduction device includes a third magnetic steel 26, a third coil 27, and a third damping diaphragm 32. The flexible supporting piece 12 is fixed on the inner wall of the shell 10, the third damping vibrating diaphragm 32 is flexibly mounted on the flexible supporting piece 12, the third coil 27 is connected with the third damping vibrating diaphragm 32, and the third magnetic steel 26 is connected with the first damping vibrating diaphragm 30. The housing 10 is provided with a sound hole 50 for cooperation with the air conduction transducer. Since the third damping diaphragm 32 is used to generate sound waves (air-conduction sound), and the first damping diaphragm 30 has a vibration transmission member, the thickness of the third damping diaphragm 32 is thinner than that of the first damping diaphragm 30, and may be 1 μm at the minimum.

The number of the air conduction transducer is not limited, in order to obtain a more three-dimensional air conduction sound effect, in this embodiment, an air conduction transducer is respectively disposed on the left and right sides of the vibration conducting member 40, the mounting orientations of the air conduction transducers on the left and right sides are different, the air conduction transducer on the left side is longitudinally mounted in the housing 10 through the flexible supporting member 12, the air conduction transducer on the right side is transversely mounted in the housing 10 through the flexible supporting member 12, and correspondingly, the orientations of the third damping diaphragms 32 connected to the air conduction transducers are also different, and the opening positions of the sound holes 50 are also different. The left sound hole 50 is provided at the top wall of the housing 10, and the right sound hole 50 is provided at the side wall of the housing 10.

Alternatively, the mounting orientations of the left air conduction transducer and the right air conduction transducer may be the same, such as both being mounted transversely or longitudinally.

Optionally, the first damping diaphragm 30 is close to one side of the first magnetic steel 21, and forms a cavity (back cavity for short) with the inner wall of the casing 10; at least one sound hole 50 is formed in a side wall or a bottom wall of the housing 10 of the rear cavity 15, and the sound hole 50 is configured to adjust a sound pressure parameter of the rear cavity 15 to improve acoustic characteristics.

Example five

In order to sufficiently combine the advantages of bone conduction and air conduction, in the second embodiment, as shown in fig. 8, an air conduction assembly bracket 13 fixed to the side wall of the housing 10 is provided in a cavity (front cavity) formed by the inner wall of the housing 10 and the vibration conducting member 40. The air conduction transduction assembly 80 is fixed to the air conduction transduction assembly bracket 13. The side wall of the housing 10 is provided with a sound hole 50. By installing the air conduction transduction assembly 80 within the housing 10, the bone conduction headset is provided with both bone conduction and air conduction advantages.

The sound hole 50 may be provided on a side wall of the housing 10 or on a top wall of the housing 10, depending on the position of the sound hole of the air conduction transducer assembly 80. The air conduction transduction assembly 80 is one or more of the existing MEMS horn and moving coil horn. The MEMS horn comprises an electromagnetic MEMS horn (also called a moving iron horn), an electrostatic MEMS horn and a piezoelectric MEMS horn. The high-frequency and ultra-high-frequency characteristics of the piezoelectric loudspeaker and the electrostatic loudspeaker are very good, and the low frequency is poor; the low frequency and the medium frequency of the moving iron loudspeaker are good, the ultrahigh frequency is poor, but the moving iron loudspeaker is easy to be interfered by external magnetic force. Therefore, a combination of a plurality of speakers is preferably selected to realize the full-band audio signal output. For example: the piezoelectric loudspeaker and the moving iron loudspeaker are adopted to realize the output of low frequency and medium frequency; adopts a moving iron horn to output lower frequency, a moving iron horn to output higher frequency and the like.

Further, a magnetic force line partition plate may be disposed between the air conduction transduction component bracket 13 and the air conduction transduction component 80, so as to reduce magnetic force interference of the first magnetic steel 21 and/or the second magnetic steel 23 on the air conduction transduction component 80.

Example six

To achieve full band audio signal output, as shown in fig. 9, in some embodiments, the first coil 22 includes two types of coils. One of the coils is configured to focus on responding to medium and low frequency acoustic electrical signals and the other coil is configured to focus on responding to medium and high frequency acoustic electrical signals. Of course, three or more first coils may be installed to respond to audio signals of high frequency, intermediate frequency, and low frequency, respectively. A second magnetic steel 23 may be installed in the first coil 22 above the first magnetic steel 21.

In summary, in this embodiment, vibration of the coil is transferred by using the damping diaphragm, and the air conduction transduction device is disposed in the housing, so that not only can a richer frequency response capability be obtained, but also vibration efficiency is high and vibration power is high.

Alternatively, in the embodiment shown in fig. 7 to 9, the first damping diaphragm 30 is adjacent to the first magnetic steel 21, and forms a cavity (referred to as a rear cavity) with the inner wall of the housing 10. At least one sound hole 50 is formed in a side wall or a bottom wall of the housing 10 of the rear cavity 15, and the sound hole 50 is configured to adjust a sound pressure parameter of the rear cavity 15 to improve acoustic characteristics.

Although fig. 6 to 9 illustrate an example in which the air conduction transducer/air conduction transducer assembly is provided to the moving coil type bone conduction speaker shown in fig. 1, the air conduction transducer/air conduction transducer assembly may be provided to the moving coil type bone conduction speaker shown in fig. 2, 3 and 5.

Example seven

This embodiment is an earphone, as shown in fig. 10, including an earphone frame 60 and the bone conduction speaker 70 of any of the above embodiments, where the bone conduction speaker 70 is fixed to the earphone frame 60.

The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that; the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions are not intended to depart from the spirit and scope of the various embodiments of the invention, which are also within the spirit and scope of the invention.

Claims (12)

1. Bone conduction speaker, its characterized in that includes:

the device comprises a shell, wherein a containing cavity is arranged in the shell, first magnetic steel and a first coil are installed in the containing cavity, and the first magnetic steel and the first coil form a transduction device for converting an audio signal into a vibration signal;

the first damping vibrating diaphragm is connected to the shell and is configured to vibrate under the drive of the transduction device;

and the vibration conduction piece is connected with the first damping vibrating diaphragm and is used for conducting vibration of the first damping vibrating diaphragm.

2. The bone conduction speaker of claim 1 wherein at least one second magnetic steel is disposed within the first coil.

3. The bone conduction speaker of claim 1, wherein the first magnetic steel is provided with a support frame, a second damping diaphragm is mounted on the support frame, a second coil is fixed on the second damping diaphragm, and the second coil and the first magnetic steel form an air conduction transduction device.

4. The bone conduction speaker of claim 1, wherein a third coil, a third damping diaphragm, and a third magnetic steel are disposed above the first damping diaphragm in the housing, and the third coil, the third damping diaphragm, and the third magnetic steel form an air transduction device.

5. The bone conduction speaker of claim 4 wherein the air conduction transducer means is provided in plurality and the third damping diaphragms are oriented differently.

6. The bone conduction speaker of claim 1, wherein a plurality of air conduction transduction component brackets are disposed above the first damping diaphragm in the housing, and air conduction transduction components for air conduction sounding are fixed on the air conduction transduction component brackets.

7. The bone conduction speaker of claim 6 wherein a magnetic flux barrier is disposed between the air conduction transducer assembly and the air conduction transducer assembly mount.

8. A bone conduction speaker according to any one of claims 3 to 7 wherein said housing is provided with a sound hole.

9. The bone conduction speaker of claim 1, wherein at least two first coils are disposed in the housing, each of the first coils being connected to the first damping diaphragm, the first coils being configured to respond to audio signals of different frequency bands, respectively.

10. The bone conduction speaker of claim 1 wherein the vibration conducting member is connected to the first damped diaphragm portion.

11. The bone conduction speaker of claim 1, wherein the first damping diaphragm has a thickness of 1.5 microns to 2 millimeters.

12. Earphone, characterized in that includes:

a headset frame and a speaker, said speaker being secured to said headset frame, said speaker being the bone conduction speaker of claim 1.

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