CN214756903U - Full-frequency bone conduction speaker - Google Patents

Abstract

The utility model discloses a full frequency bone conduction speaker, including magnetic circuit subassembly, vibration subassembly and conductive coil subassembly, magnetic circuit subassembly includes first magnetic substance, second magnetic substance and third magnetic substance, the vibration subassembly includes at least one biography vibration piece, biography vibration piece support, and the vibration subassembly contains a biography vibration piece at least, and the biography vibration piece is fixed on biography vibration piece support, the conductive coil subassembly includes conductive coil, coil fixed bolster, and the conductive coil part at least is located first magnetic gap to there is certain clearance with second magnetic substance surface. The multifunctional wearable electronic device has the characteristics of small volume, light weight, high sensitivity, strong stability and the like, is easy to apply to the existing small digital products or intelligent wearable products, and can be implanted into a human body to realize specific functions.

Description

Full-frequency bone conduction speaker

Technical Field

The utility model relates to a speaker field, in particular to full bone conduction speaker frequently.

Background

People are more and more high to wearing comfort requirement of audio frequency product nowadays, and the product miniaturization is the trend, and the product diminishes but the requirement of sound is more and more high, and present bone conduction loudspeaker is because the structure and the material characteristic of product, bone conduction oscillator do little back, and magnet and coil all will reduce, are difficult to satisfy the demand of realizing the product, but lead to sensitivity to reduce easily when the consumption reduces.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a full frequency bone conduction speaker, when aiming at guaranteeing the consumption reduction, sensitivity still can guarantee to reach predetermined standard.

In order to achieve the above object, the utility model provides a full bone conduction speaker frequently, include:

the magnetic circuit assembly comprises a first magnetic body, a second magnetic body and a third magnetic body, the first magnetic body is a hollow annular body, at least one surface of the first magnetic body is in contact with at least one surface of the second magnetic body, at least one surface of the first magnetic body is at least partially surrounded by the first magnetic body to form a first magnetic cavity, the first magnetic body and the second magnetic body generate a first magnetic field, the third magnetic body is at least partially positioned in the first magnetic cavity and forms a first magnetic gap with the first magnetic body, the third magnetic body generates a second magnetic field, and at least one second magnetic body is positioned below the first magnetic gap,

the vibration assembly comprises at least one vibration transmission sheet and a vibration transmission sheet bracket, the vibration assembly at least comprises one vibration transmission sheet, and the vibration transmission sheet is fixed on the vibration transmission sheet bracket; the vibration transmission sheet is provided with a first inner hole, the conductive coil at least partially penetrates through the first inner hole, at least one plane of the first magnetic body is locally and fixedly connected with the vibration transmission sheet, and the conductive coil is fixed on the lower surface of the coil fixing support and is surrounded in the middle;

and the conductive coil assembly comprises a conductive coil and a coil fixing support, and the conductive coil is at least partially positioned in the first magnetic gap and has a certain gap with the surface of the second magnetic body.

The conductive coil of the full-frequency bone conduction speaker can conduct electricity, the magnetic circuit assembly can generate a magnetic field, and the magnetic circuit assembly can comprise a first magnetic body and a second magnetic body which generate a first magnetic field; the first magnetic body is at least partially provided with a first magnetic body annular hole;

preferably, the lower surface of the first magnetic body is in contact connection with the upper surface of the second magnetic body, and at least part of the second magnetic body surrounds the first magnetic body and forms a first magnetic cavity;

preferably, the second magnetic body may further include at least one second magnetic body a connected in a stacked combination with the second magnetic body a for enhancing the strength of the first magnetic field.

Preferably, the second magnetic body may further include at least one second magnetic body B, and the second magnetic body B is connected to the second magnetic body a and the second magnetic body a in a stacked combination for enhancing the strength of the first magnetic field.

Preferably, the magnetic circuit assembly further comprises a third magnetic body, the third magnetic body is at least partially arranged in the first magnetic cavity, is in close contact with the upper surface of the second magnetic body and annularly surrounds the upper surface of the second magnetic body, and the third magnetic body generates a second magnetic field; the third magnetic body and the first magnetic body form a first magnetic gap, and the first magnetic field is larger than the magnetic field intensity of the second magnetic field.

Preferably, the first magnetic body and the second magnetic body in the magnetic circuit assembly may be integrally formed or connected into a whole according to design requirements of the process, and are provided as the first magnetic field assembly.

Preferably, the coil is placed in the first magnetic gap in an embodiment according to the patent of the present application.

The utility model discloses technical scheme possesses small in size, light in weight, and sensitivity is high, stability characteristics such as strong, easily use to present small and exquisite digital product or intelligent dress product to realize specific function in probably implanting the human body.

Drawings

Fig. 1 is a block diagram of a full-band bone conduction speaker 01 according to the present embodiment;

fig. 2 is a cross-sectional schematic view of a full-band bone conduction speaker 01 according to some embodiments of the present application;

fig. 3-1 is a cross-sectional schematic view of a coil and magnetic circuit assembly 011 according to an embodiment of the present application;

fig. 3-2 illustrates a cross-sectional view of a coil and magnetic circuit assembly 021 according to some embodiments of the application;

figures 3-3 are cross-sectional schematic views of a coil and magnetic circuit assembly 031 according to some embodiments of the application;

FIGS. 3-4 illustrate cross-sectional views of a coil and magnetic circuit assembly 041, in accordance with some embodiments of the application;

FIG. 4-1 is a cross-sectional schematic view of a coil and magnetic circuit assembly according to some embodiments of the application;

fig. 4-2 is a schematic view of magnetic flux lines of a coil and magnetic circuit assembly according to some embodiments of the present application;

fig. 5 is a schematic diagram of a full-band bone conduction speaker 01 according to some embodiments of the present application;

fig. 6 is a schematic structural diagram of a full-band bone conduction speaker 01 according to some embodiments of the present application;

FIG. 7 is a schematic view of a vibration plate configuration according to some embodiments of the present application;

figure 8 is a schematic structural view of a conductive coil fixing support according to some embodiments of the present application;

figure 9 is a schematic diagram of a vibration plate carrier structure according to some embodiments of the present application.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indicators (such as … …, upper, lower, left, right, front, back, top, bottom, inner, outer, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial) are involved in the embodiments of the present invention, the directional indicators are only used to explain the relative position, motion, etc. of the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are changed accordingly.

In addition, if there is a description relating to "first" or "second", etc. in the embodiments of the present invention, the description of "first" or "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Without loss of generality, in describing the bone conduction related art of the present invention, a description of a "full frequency bone conduction speaker" or a "bone conduction earphone" or a "bone conduction vibration unit" will be used, which is only one form of bone conduction application, and it is also possible for those skilled in the art to substitute the same words as "speaker", "earphone", "speaker", and the like, and to describe "player", "hearing aid", and the like.

As shown in fig. 1 to 9, a full frequency bone conduction speaker includes:

the magnetic circuit assembly comprises a first magnetic body, a second magnetic body and a third magnetic body, the first magnetic body is a hollow annular body, at least one surface of the first magnetic body is in contact with at least one surface of the second magnetic body, at least one surface of the first magnetic body is at least partially surrounded by the first magnetic body to form a first magnetic cavity, the first magnetic body and the second magnetic body generate a first magnetic field, the third magnetic body is at least partially positioned in the first magnetic cavity and forms a first magnetic gap with the first magnetic body, the third magnetic body generates a second magnetic field, and at least one second magnetic body is positioned below the first magnetic gap,

the vibration assembly comprises at least one vibration transmission sheet and a vibration transmission sheet bracket, the vibration assembly at least comprises one vibration transmission sheet, and the vibration transmission sheet is fixed on the vibration transmission sheet bracket; the vibration transmission sheet is provided with a first inner hole, the conductive coil at least partially penetrates through the first inner hole, at least one plane of the first magnetic body is locally and fixedly connected with the vibration transmission sheet, and the conductive coil is fixed on the lower surface of the coil fixing support and is surrounded in the middle;

and the conductive coil assembly comprises a conductive coil and a coil fixing support, and the conductive coil is at least partially positioned in the first magnetic gap and has a certain gap with the surface of the second magnetic body.

In some embodiments, the full frequency bone conduction speaker comprises a coil and a magnetic circuit component; the coil may be electrically conductive and the magnetic circuit assembly may generate a magnetic field; the magnetic circuit assembly comprises a first magnetic body, a second magnetic body and a third magnetic body; at least one surface of the first magnetic body and at least one surface of the second magnetic body are in contact with each other and at least partially surround to form a first magnetic cavity; the first magnetic body and the second magnetic body generate a first magnetic field; the third magnetic body is at least partially positioned in the first magnetic cavity and forms a first magnetic gap with the first magnetic body, and the third magnetic body generates a second magnetic field; the at least one second magnetic body is positioned below the first magnetic gap; the coil is at least partially located within the first magnetic gap. The combination of the plurality of second magnets and the first magnet in the magnetic circuit assembly can improve the magnetic field intensity of the magnetic gap, improve the sensitivity and the resolving power of the loudspeaker, reduce the size and improve the efficacy.

The loudspeaker has the characteristics of small volume, light weight, high sensitivity, strong stability and the like, is easy to apply to the existing small digital products or intelligent wearing products, and can be implanted into a human body to realize specific functions.

A full-frequency bone conduction speaker can include a magnetic circuit component 011, a vibration component 012, and a conductive coil component 013.

The magnetic circuit assembly 011 provides a magnetic field. The magnetic field may be used to convert a signal containing acoustic information into vibrations. The acoustic information signal may include one or more of an electrical signal, a magnetic signal, an optical signal, a mechanical vibration signal, and the like, mixed or combined. Which may be a single signal source or a plurality of signal sources, which may be related or independent of each other.

The wireless connection may include radio communication, acoustic communication, electromagnetic induction, optical communication, and the like. The wireless communication may include IEEE802.11 series of standards, IEEE802.15 series of standards, including bluetooth technology or zigbee technology, first generation communication technology, second generation communication technology, such as CDMA \ WCDMA \ SSMA \ FDMA, etc., communication packet wireless technology, third generation fourth generation mobile communication technology, satellite communication (GPS), etc., and the above description is only for further explanation.

The vibration assembly 012 may generate vibrations. The vibration generation is accompanied with energy conversion, and the full-frequency bone conduction speaker 01 can convert sound into vibration of different frequencies by using the magnetic circuit component 011 and the vibration component 012. The conversion process may involve conversion of different energies, electrical signals may be converted into mechanical vibrations by the transducer means to produce sound, some sound signals may be contained in optical signals, and some special transducer means may also be converted into mechanical vibrations to produce sound. Full frequency bone conduction speaker adopts conductive coil transducer, include at least one vibration conduction piece in vibration subassembly 012, include at least one ring form coil in the conductive coil subassembly 013, the ring form coil that is driven by signal current drives vibration conduction piece vibration sound production in magnetic field, the fixed mode of vibration conduction piece, the material, the hardness, the shape, the magnetic density of permanent magnet, the material internal resistance of coil etc. all can be to full frequency bone conduction speaker's loudness, sensitivity, analytic power produces the influence, vibration conduction piece can be the ring structure, the centre is provided with the through-hole, can be provided with the vibration conduction arm more than three in the middle of the through-hole and the outer eaves of vibration conduction piece.

Fig. 2 is a cross-sectional schematic view of a full-band bone conduction speaker 01 according to some embodiments of the present application. As shown in the figure, the full-frequency bone conduction speaker 01 may include a first magnetic body 0111, a second magnetic body 0112, a third magnetic body 0113, a vibration transmitting sheet 0121, a conductive coil 0131, a vibration transmitting sheet support 0122, and a conductive coil fixing support 0132.

The magnetic body described in the present application refers to an element that can generate a magnetic field, such as a magnet or the like. The magnetic body may have a magnetization direction that is a magnetic field direction inside the magnetic body. The first magnetic body 0111 can include one or more magnets. In some embodiments, the magnets may include metal alloy magnets, ferrites, and the like. Metal alloy magnets include neodymium iron boron, samarium cobalt, iron nickel cobalt, aluminum iron boron, aluminum nickel cobalt, iron carbon aluminum, or the like, or similar and combinations thereof. Ferrites include iron and steel ferrites, magnesium ferrites, lithium ferrites, and the like, or the like and combinations thereof.

Fig. 3-1 is a cross-sectional schematic view of a coil and magnetic circuit assembly 011 according to an embodiment of the present application. In some embodiments, the bottom surface of the first magnetic body 0111 is connected to the outer edge of the top surface of the second magnetic body 0112 to form a first magnetic cavity 01a, and the first magnetic body 0111 and the second magnetic body 0112 have the same magnetization direction to jointly generate a first magnetic field. The third magnetic body 0113 is at least partially arranged in the first magnetic cavity 01a, the bottom surface of the third magnetic body 0113 is connected with the top surface of the second magnetic body 0112 to form a first magnetic gap 01b, and the conductive coil 0131 can be arranged in the first magnetic gap 01 b. The third magnetic body 0113 generates a second magnetic field. The conductive coil 0131 may be connected with the conductive coil fixing bracket 0132. The conductive coil fixing bracket 0132 can be fixed at the upper end of the vibration transmission sheet bracket 0122, and a certain distance is arranged between the fixed conductive coil fixing bracket 0132 and the vibration transmission sheet to prevent the vibration transmission sheet 0121 from rubbing the conductive coil fixing bracket 0132 to generate noise when vibrating. The vibration transmission sheet 0121 can be connected to the vibration transmission sheet support 0122, and the vibration transmission sheet 0121 can be fixed at the lower end of the vibration transmission sheet support 0122 by in-mold forming or bonding. The electrically conductive coil 0131 at least partially penetrates the central hole of the vibrating plate 0121 and is at least partially disposed in the first magnetic gap 01 b. The top surface of the first magnetic body 0111 may be connected to the edge of the middle hole of the vibration transmitting sheet 0121. When current is introduced into the conductive coil 0131, the conductive coil 0131 is positioned in a magnetic field formed by the first magnetic body 0111, the second magnetic body 0112 and the third magnetic body 0113 and can be acted by ampere force, the ampere force drives the conductive coil 0131 to vibrate, and the vibration of the conductive coil 0131 can drive the conductive coil fixing support 0132, the vibration transmission vibration piece support 0122 and the vibration transmission vibration piece 0121 to vibrate. The fixing bracket 0132 of the conductive coil can be directly contacted with the human body or closely connected with the shell of the product, and the vibration is conducted through the human body.

The vibration transmission sheet 0121 is a non-magnetic conductive component, and the material thereof needs to be a non-magnetic conductive material, and the non-magnetic conductive material refers to a material which does not or does not easily attract the magnet. The non-magnetic conductive material may include aluminum alloy, stainless steel, synthetic plastic, copper, or some composite material that does not have attraction to the magnet. In some embodiments, the desired morphology may be achieved by etching, stamping, die casting, extrusion, CNC machining, and the like.

The vibration transmission piece bracket 0122 is a non-magnetic conductive component, and the material is selected from non-magnetic conductive material, which means a material not attracted with the magnet or a material not easily attracted with the magnet. The non-magnetic material can comprise aluminum alloy, stainless steel, ABS, PC and ABS mixture, synthetic plastic, copper or some synthetic material composite materials which do not adsorb with magnets. In some embodiments, the desired shape can be obtained by die forming, plastic injection molding, stamping, die casting, extrusion, CNC machining, and the like.

The fixing support 0132 is a non-magnetic conductive component, and the material of the fixing support is selected from a non-magnetic conductive material, wherein the non-magnetic conductive material refers to a material which does not attract the magnet or a material which does not easily attract the magnet. The non-magnetic material can comprise aluminum alloy, stainless steel, ABS, PC and ABS mixture, synthetic plastic, copper, PCB board or some synthetic material composite materials which do not adsorb with magnet. In some embodiments, the desired shape can be obtained by die forming, plastic injection molding, stamping, die casting, extrusion, CNC machining, and the like.

In some embodiments, the conventional full-band bone conduction speaker adopts a magnetic conductive element attached around a magnetic body, and the magnetic conductive element can reduce the occurrence of leakage of magnetic induction lines, but the effect is not ideal, so that the magnetic induction intensity is reduced, and the sensitivity of the full-band bone conduction speaker is affected. Therefore full frequency bone conduction speaker 01 can reinforce the second magnetic field that third magnetic substance 0113 produced through the first magnetic field that first magnetic substance 0111 and second magnetic substance 0112 produced, thereby restrain revealing of magnetic induction line, first magnetic field and second magnetic field magnetic pole are opposite, the form of the magnetic induction line of restraint conductive coil that can be better, make more magnetic induction lines pass the conductive coil as intensive as possible, the magnetic induction intensity of conductive coil position has been increased, magnetic field intensity has been increased, thereby full frequency bone conduction speaker 01's sensitivity has been improved, the efficiency of mechanical energy has been improved.

The above description of the structure of the full frequency bone conduction speaker 01 is merely a specific example and should not be considered as the only possible embodiment. It will be apparent to persons skilled in the art that, having the benefit of the general principles of full frequency bone conduction speakers, it is possible to modify and change the form and details of the specific embodiments and steps without departing from such principles, but such modifications and changes are intended to be within the scope of the foregoing description.

Fig. 3-2 is a cross-sectional view of a coil and magnetic circuit assembly 021 according to some embodiments of the application. As shown in fig. 3-2, a coil and magnetic circuit assembly 021 may include a first magnetic body 0111, at least one second magnetic body 0112, a third magnetic body 0113, and a conductive coil 0131; according to the requirement of adjusting the magnetic flux of the magnetic field or the requirement of the counterweight, a second magnetic body 0112A or a second magnetic body 0112B can be additionally arranged to meet the requirement of increasing the magnetic flux or the counterweight.

In the embodiment of the present invention, the shape of the second magnetic body 0112 and the second magnet 0112A or the second magnetic body 0112B can adopt the same shape and have different shapes, different sizes and different thicknesses, the magnetic strength of the magnet is different or the same, and the polarity direction of the magnet is the same. Any second magnetic body can be arranged in a ring shape or a sheet shape, and any second magnetic body is coaxial. The lower surface of the second magnetic body 0112 is tightly connected with the upper surface of the second magnetic body 0112A; the lower surface of the second magnetic body 0112A is tightly connected with the upper surface of the second magnetic body 0112B; more than one second magnetic body may collectively form one magnetic field.

Fig. 3-3 are cross-sectional schematic views of a coil and magnetic circuit assembly 031, according to some embodiments of the application. As shown in fig. 3-3, a coil and magnetic circuit assembly 031 may include a first magnetic body 0111, at least one second magnetic body 0112, a third magnetic body 0113, a conductive coil 0131, and a second magnetic body 0311; the second magnetic body 0311 is an annular magnetic body, the second magnetic body 0311 is embedded in the first magnetic gap 01b, and the lower surface of the second magnetic body 0311 is tightly connected with the upper surface of the second magnetic body 0112; the second magnetic body 0311 is in the same direction as the magnetic pole of the second magnetic body 0112 and forms a magnetic field.

Fig. 3-4 are cross-sectional views of a coil and magnetic circuit assembly 041, in accordance with some embodiments of the application. The first magnetic body 0411 with a U-shaped cross section can be integrally formed with the second magnetic body according to the requirements of the process, the first magnetic body 0411 forms a first magnetic field, the lower surface of the third magnetic body 0113 is tightly connected with the inner surface of the first magnetic body 0411, and the third magnetic body 0113 forms a second magnetic field; the first magnetic body 0411 and the third magnetic body 0113 have opposite polarities. The first magnetic body 0411 and the third magnetic body 0113 form a first magnetic gap 01 b.

Figures 3-5 are cross-sectional schematic views of a coil and magnetic circuit assembly 051 according to some embodiments of the present application. The second magnetic body 0513 with a T-shaped section can be integrally formed by the second magnetic body and the third magnetic body according to the requirements of process realization, the second magnetic body 0513 forms a second magnetic field, the lower surface of the first magnetic body 0111 is tightly connected with the upper surface of the edge of the second magnetic body 0513, and the first magnetic body 0111 forms a first magnetic field; the first magnetic body 0111 and the second magnetic body 0513 have opposite magnet polarities. The protruding portion of the second magnetic body 0513 and the first magnetic body 0111 form a first magnetic gap 01 b.

The magnetic field directions of the first magnetic field and the second magnetic field are opposite, so that the magnetic fields can be mutually compressed, more magnetic fields can be compressed into the magnetic gap, and the magnetic induction intensity in the magnetic gap is improved. The description of the embodiments shown above is merely a specific example and should not be taken as the only possible implementation. It will be apparent to persons skilled in the art, having the benefit of understanding the basic principles of the bone conduction magnetic circuit assembly, that various modifications and changes in form and detail may be made to the specific forms and steps of the example coil and magnetic circuit assemblies 011, 021, 031, 041, 051 without departing from such principles, but such modifications and changes are within the scope of the above description.

Fig. 4-1 is a cross-sectional schematic view of a coil and magnetic circuit assembly according to some embodiments of the application. The first magnetic body 0111 can be suitable for any magnetic circuit assembly in the application. As shown, the first magnetic body 0111 can be ring-shaped. The first magnetic body 0111 includes a first magnetic body inner ring 0111b and a first magnetic body outer ring 0111 a. In some embodiments, the first inner magnetic body ring 0111b and the first outer magnetic body ring 0111a can be circular, oval, racetrack, triangular, quadrilateral, polygonal, irregular, etc. The third magnetic body 0113 includes a third magnetic body outer wall 0113a, and the third magnetic body outer wall 0113a may be triangular, quadrilateral, polygonal, irregular, and the like.

Fig. 4-2 is a schematic view of magnetic flux lines of a coil and magnetic circuit assembly according to some embodiments of the present application. As shown in the figure, the magnetic circuit assembly includes a first magnetic body 0111, a second magnetic body 0112 and a third magnetic body 0113; the magnetization direction of the first magnetic body 0111 is the same with the magnetization direction of the 0112 of second magnetic body, the first magnetic body 0111 produces first magnetic field with the 0112 of second magnetic body, the third magnetic body 0113 produces the second magnetic field, the arrow direction is magnetic induction line tangential direction, the conductive coil 0131 is in the intersection in first magnetic field and second magnetic field, the tangential direction of the magnetic induction line in two magnetic fields, first magnetic field and second magnetic field polarity opposite direction, more concentrates on in first magnetic gap scope of magnetic induction line mutual compression.

Fig. 5 and 6 are schematic structural views of a full-band bone conduction speaker 01 according to some embodiments of the present application. As shown in the figure, full frequency bone conduction speaker 01 includes first magnetic substance 0111, second magnetic substance 0112, third magnetic substance 0113, pass piece 0121 that shakes, conductive coil 0131, pass piece support 0122 that shakes, conductive coil fixed bolster 0132 wherein according to the needs that design needs or technology realized, can adopt the second embodiment: the first magnetic body 0111 and the second magnetic body 0112 may be integrally formed, and the formed U-shaped magnetic body may be the first magnetic body 0411, further, the third embodiment may be adopted: the second magnetic body 0112 and the third magnetic body 0113 can be integrally formed according to design requirements and requirements of process realization to form a T-shaped magnetic body, and the formed T-shaped magnetic body is the second magnetic body 0513 and the middle part of the second magnetic body 0513 is locally raised. Various schemes may be adopted according to design requirements, and other components of the full frequency bone conduction speaker 01 except for the combination of the magnet portions are not changed.

The vibration isolator comprises at least one vibration transmission sheet 0121, wherein the vibration transmission sheet 0121 is a thin sheet made of a non-magnetic material and has no adsorption force or weak adsorption force with a magnetic material, the vibration transmission sheet 0121 is provided with a first inner hole 0121a, a vibration transmission arm 0121b and a magnetic body fixing area 0121c (refer to figure 7), and the at least one vibration transmission sheet 0121 and a vibration transmission sheet bracket 0122 are integrally formed or bonded together to form a vibration assembly 012 (refer to figure 9). The lower surface of the first magnetic body 0111 is tightly connected with the upper surface of the second magnetic body 0112, and the first magnetic body 0111 and the second magnetic body 0112 share a central shaft to form annular surrounding; the lower surface of the third magnetic body 0113 is tightly connected with the upper surface of the second magnetic body 0112, and the third magnetic body 0113 and the second magnetic body 0112 share a central axis to form an annular surrounding; forming a magnetic circuit assembly 011. The upper surface of the first magnetic body 0111 is tightly fixed to the lower surface of the magnetic body fixing region 0121c of the vibration transmitting plate 0121. The conductive coil fixing bracket 0132 is provided with a through hole 0132a for passing the conductive coil wire, a middle bulge 0132c and an outer edge indent 0132b (refer to fig. 8); the upper surface of the conductive coil 0131 is centrally fixed on the lower surface of a middle lug boss 0132c of the conductive coil fixing support 0132; forming the conductive coil assembly 013. The conductive coil fixing bracket 0132 is a thin sheet made of a non-magnetic conductive material, has no adsorption force or weak adsorption force with a magnetic material, and the outer edge of the conductive coil fixing bracket 0132 is inwards concave 0132b and fixed at the L-shaped groove 0122a of the vibration transmission sheet bracket 0122, and is fixed by glue dispensing or tight fitting or spot welding. After the conductive coil fixing support 0132 is fixed, the conductive coil 0131 at least partially penetrates through a first inner hole 0121a of the vibration transmission piece 0121, the conductive coil 0131 and a third magnetic body 0113 share a central shaft to form annular surrounding, and the distance between the inner wall of the conductive coil 0131 and the outer wall of the third magnetic body 0113 is a certain distance, which ranges from 0.2mm to 0.5 mm; the conductive coil 0131 is arranged in the first magnetic gap 01b, and the outer wall of the conductive coil 0131 is spaced from the interior of the first magnetic body 0111 by a certain distance, wherein the distance ranges from 0.2mm to 0.5 mm; the first magnetic body is an inner hollow circular ring, and the thickness of the circular ring is between 0.5mm and 5 mm.

A certain gap is formed between the lower surface of the coil and the second magnetic body, and the gap distance is 0.5mm to 1.5 mm.

The above description of the structure of the full frequency bone conduction speaker 01 is merely a specific example and should not be considered as the only possible embodiment. It will be apparent to persons skilled in the art that, having the benefit of the teachings of the bone conduction magnetic circuit assembly, various modifications and changes in form and detail may be made to the specific forms and steps of the embodiment full frequency bone conduction speaker 01 without departing from such principles, but such modifications and changes are intended to be within the scope of the foregoing description. For example, full frequency bone conduction speaker 01 may include one or more conductive elements disposed on the inner and outer walls of conductive coil 0131. The full frequency bone conduction speaker 01 may include a plurality of annular first magnetic bodies, and may be disposed on a surface of an inner wall of the first magnetic body or in the first magnetic gap.

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.

Claims (10)

1. A full frequency bone conduction speaker, comprising:

the magnetic circuit assembly comprises a first magnetic body, a second magnetic body and a third magnetic body, the first magnetic body is a hollow annular body, at least one surface of the first magnetic body is in contact with at least one surface of the second magnetic body, at least one surface of the first magnetic body is at least partially surrounded by the first magnetic body to form a first magnetic cavity, the first magnetic body and the second magnetic body generate a first magnetic field, the third magnetic body is at least partially positioned in the first magnetic cavity and forms a first magnetic gap with the first magnetic body, the third magnetic body generates a second magnetic field, and at least one second magnetic body is positioned below the first magnetic gap,

the vibration assembly comprises at least one vibration transmission sheet and a vibration transmission sheet bracket, the vibration assembly at least comprises one vibration transmission sheet, and the vibration transmission sheet is fixed on the vibration transmission sheet bracket; the vibration transmission sheet is provided with a first inner hole, the conductive coil at least partially penetrates through the first inner hole, at least one plane of the first magnetic body is locally and fixedly connected with the vibration transmission sheet, and the conductive coil is fixed on the lower surface of the coil fixing support and is surrounded in the middle;

and the conductive coil assembly comprises a conductive coil and a coil fixing support, and the conductive coil is at least partially positioned in the first magnetic gap and has a certain gap with the surface of the second magnetic body.

2. The full-band bone conduction speaker of claim 1, wherein: the first magnetic body and the second magnetic body can be integrally formed or combined into a first magnetic field assembly and form a first magnetic cavity, and the first magnetic field assembly generates a first magnetic field.

3. The full-band bone conduction speaker of claim 1, wherein: the first magnetic body and the second magnetic body have the same magnetic field direction, and the third magnetic body has the opposite magnetic field direction to the first magnetic body and the second magnetic body.

4. The full-band bone conduction speaker of claim 1, wherein: and the second magnetic bodies can be a combination or superposition combination of a plurality of magnetic bodies, and the magnetic field directions of the plurality of second magnetic bodies are the same.

5. The full-band bone conduction speaker of claim 1, wherein: the first magnetic body is a hollow annular body, and the thickness of the first magnetic body is between 0.5mm and 5 mm.

6. The full-band bone conduction speaker of claim 1, wherein: the at least one conductive coil is annularly surrounded with the interior of the first magnetic body, and the distance between the at least one conductive coil and the interior of the first magnetic body is 0.2mm to 0.5 mm.

7. The full-band bone conduction speaker of claim 1, wherein: the conductive coil is annularly surrounded with the outside of the third magnetic body, and the distance between the conductive coil and the inside of the third magnetic body is 0.2mm to 0.5 mm.

8. The full-band bone conduction speaker of claim 1, wherein: the coil is at least partially arranged in the first magnetic gap, a certain gap is formed between the lower surface of the coil and the second magnetic body, and the gap distance is 0.5mm to 1.5 mm.

9. The full-band bone conduction speaker of claim 1, wherein: the first magnetic body is connected to the second magnetic body and generates a first magnetic field configured to reinforce a magnetic flux of a second magnetic field generated by the third magnetic body and suppress field intensity leakage of the second magnetic field.

10. The full-band bone conduction speaker of claim 1, wherein: the first magnetic body, the second magnetic body and the third magnetic body are magnetic elements and are made of magnetic materials; the vibration transmission piece, the vibration transmission piece bracket and the coil fixing bracket are non-magnetic components and are made of non-magnetic materials.

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