Magnetic circuit assembly, bone conduction sounding device and bone conduction earphone

Abstract

The utility model discloses a magnetic circuit assembly, a bone conduction sounding device and a bone conduction earphone. The magnetic circuit assembly comprises a magnetic circuit assembly, a coil and a short circuit piece. The magnetic circuit assembly comprises a magnet and a magnetic conductive plate connected with the magnet, and the magnet is magnetized in the axis direction of the magnetic circuit assembly; the coil surrounds the periphery of the magnetic conductive plate and is used for driving the magnetic circuit assembly to vibrate in the axis direction. And the short-circuit piece is arranged in an alternating magnetic field generated after the coil is electrified, is of a hollow annular structure and is made of a conductive material. According to the magnetic circuit assembly, the bone conduction sounding device and the bone conduction earphone provided by the utility model, the short-circuit piece made of conductive materials is added, and the inductance of the coil is reduced through the short-circuit piece, so that the overall inductive reactance of the magnetic circuit assembly is reduced, and the magnetic performance condition is achieved and improved.

Description

[0001] Priority information: This application claims priority to Chinese Patent Application No. 202311242077.5 filed on September 25, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The utility model relates to the technical field of bone conduction sound generation, in particular to a magnetic circuit component, a bone conduction sound generation device and a bone conduction earphone. Background Art

[0003] Bone conduction sound devices can convert electrical signals into mechanical vibration signals, and transmit the mechanical vibration signals to the human auditory nerve through human tissues and bones, so that the wearer can hear the sound. Bone conduction speakers need to drive soft tissues such as human skin to vibrate together, which requires higher mechanical energy. Due to the size limitation of wearable devices, the conversion efficiency of mechanical energy is also particularly important; bone conduction sound devices can be divided into dynamic coil type, moving iron type and moving magnet type according to the different vibration components.

[0004] The mainstream magnetic circuit components on the market are: Figure 1 As shown, it includes a magnet 1, a magnetic plate 2, a coil 3 and a magnetic bowl 6; wherein the magnet 1 is connected to the magnetic bowl 6 and the magnetic plate 2 respectively, and the coil 3 is located in the gap between the magnetic plate 2 and the magnetic bowl 6. The magnetic performance of the bone conduction sound generating device is poor, resulting in a low electrical-mechanical conversion rate, and higher power is required to achieve a better mechanical output.

[0005] like Figure 2 The figure shows the common impedance curve characteristic diagram of the magnetic circuit component unit. As the frequency increases to f0, its impedance will reach a peak value, resonance will occur, and the speed of its vibration system will become the maximum. Since its motional impedance originates from the action of the Lorentz force, the maximum motional reverse current will be generated, causing the motional impedance to reach a peak value. As the frequency continues to increase, the speed gradually decreases, and the motional impedance decreases accordingly. When it reaches f1 in the figure, the values ​​of the system's inductive impedance and motional impedance are in opposite phases. At this time, the system impedance reaches the minimum value, close to the static resistance value of the system. As the frequency continues to increase, the system's vibration speed drops sharply, and its motional impedance also decreases rapidly. The inductive impedance begins to play a major role, and the rate of change of inductance and current is positively correlated, resulting in the characteristic that the impedance continues to rise with increasing frequency. As a result, under the same power conditions, the electric-mechanical conversion rate continues to decline.

[0006] Therefore, it is necessary to improve the prior art to overcome the above defects in the prior art. Utility Model Content

[0007] The utility model aims to provide a magnetic circuit component, a bone conduction sound generating device and a bone conduction earphone, which can suppress the inductance of the coil and improve the performance of bone conduction products with medium and high frequency band electrical-mechanical conversion rate.

[0008] In order to achieve the above-mentioned utility model object, the utility model proposes a magnetic circuit component, including

[0009] A magnetic circuit assembly, comprising a magnet and a magnetic conductive plate connected to the magnet, wherein the magnet is magnetized along the axis direction of the magnetic circuit assembly;

[0010] A coil, surrounding the outer circumference of the magnetic conductive plate, for driving the magnetic circuit assembly to vibrate along the axis direction; and

[0011] The short-circuit component is arranged in the alternating magnetic field generated after the coil is energized. The short-circuit component is in a hollow ring structure and is made of conductive material.

[0012] Further, the short-circuit member surrounds the outside of the magnet and is in direct contact with the magnet; and / or,

[0013] The short-circuit element surrounds the outer side of the magnetic conductive plate and is in direct contact with the magnetic conductive plate; and / or,

[0014] The short-circuit element surrounds the outer side of the coil and is in direct contact with the coil.

[0015] Furthermore, the magnet assembly is composed of at least two magnets and a magnetic conductive plate connected between two adjacent magnets, and the two adjacent magnets are arranged with the same poles facing each other; and the coil surrounds the outer circumference of the magnetic conductive plate.

[0016] Further, the outer periphery of the magnet and the magnetic conductive plate is provided with a short-circuit member; or,

[0017] The short-circuit member is disposed only on the periphery of the magnetic conductive plate, and the outer peripheral surface of the short-circuit member is flush with the outer peripheral surface of the magnet; or

[0018] The short-circuit member is disposed only on the outer periphery of the magnet, and the outer peripheral surface of the short-circuit member is flush with the outer peripheral surface of the magnetic conductive plate.

[0019] Furthermore, the magnet assembly is composed of two magnetic conductive plates and the magnet connected between two adjacent magnetic conductive plates; and one coil is correspondingly surrounded by the outer circumference of each magnetic conductive plate.

[0020] Furthermore, outer circumferential surfaces of at least two of the coils or outer circumferential surfaces of all of the coils are connected to the same short-circuit member.

[0021] Furthermore, the thickness of the magnet is 65%-90% of the total thickness of the magnet assembly.

[0022] Furthermore, it also includes two magnetic bowls, the openings of the two magnetic bowls are arranged opposite to each other, and the two magnets are respectively fitted and arranged in the two magnetic bowls; the short-circuit member is arranged on the outside of the magnetic plate.

[0023] Further, the magnetic bowl comprises a base plate and an annular side plate, and the side plate is connected to the base plate at an angle;

[0024] The side plate extends between the coil and the magnetic circuit assembly; or,

[0025] The side plate extends to the outside of the coil and is arranged opposite to the outer peripheral surface of the magnetic conductive plate, and a magnetic gap is formed between the side plate and the magnetic conductive plate; the coil and the short-circuit member are located in the magnetic gap.

[0026] In a second aspect, the present application provides a bone conduction sound generating device, comprising the magnetic circuit assembly as described in the first aspect;

[0027] a housing, comprising an inner cavity for mounting the magnetic circuit assembly, wherein the coil is relatively fixed to the housing; and

[0028] The spring piece is connected between the shell and the magnetic circuit component. The spring piece includes an outer bracket fixed relatively to the shell, an inner bracket arranged in the outer bracket, and an elastic arm connected between the outer bracket and the inner bracket. The magnetic circuit component is connected to the inner bracket.

[0029] Furthermore, the inner cavity has a first open end and a second open end located at both ends thereof, and each of the first open end and the second open end is provided with a spring sheet, and the two spring sheets are respectively connected to the two ends of the magnetic circuit component.

[0030] In a third aspect, the present application proposes a bone conduction earphone, comprising the bone conduction sound generating device as described in the second aspect.

[0031] Compared with the prior art, the utility model has the following beneficial effects: the magnetic circuit assembly provided by the utility model adds a short-circuit member made of conductive material, and the inductance of the coil is reduced by the short-circuit member, so as to reduce the overall inductive reactance of the magnetic circuit assembly, thereby achieving and improving the magnetic performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the structure of the mainstream magnetic circuit components on the market;

[0033] Figure 2 yes Figure 1 Schematic diagram of the impedance characteristic curve of the bone conduction sound device;

[0034] Figure 3 is a cross-sectional view of the first embodiment of the magnetic circuit assembly of the present invention;

[0035] Figure 4 is a cross-sectional view of a second embodiment of the magnetic circuit assembly of the present invention;

[0036] Figure 5 is a cross-sectional view of a third embodiment of the magnetic circuit assembly of the present invention;

[0037] Figure 6 is a cross-sectional view of a fourth embodiment of the magnetic circuit assembly of the present invention;

[0038] Figure 7 is a cross-sectional view of a fifth embodiment of the magnetic circuit assembly of the present invention;

[0039] Figure 8 is a cross-sectional view of a sixth embodiment of the magnetic circuit assembly of the present invention;

[0040] Fig. 9 is a cross-sectional view of Embodiment 7 of the magnetic circuit assembly of the present invention;

[0041] Fig.10 is a cross-sectional view of Embodiment 8 of the magnetic circuit assembly of the present invention;

[0042] Fig.11 is a cross-sectional view of a ninth embodiment of the magnetic circuit assembly of the present invention;

[0043] Fig.12 is a cross-sectional view of a tenth embodiment of a magnetic circuit assembly in the present invention;

[0044] Fig.13 is a cross-sectional view of the eleventh embodiment of the magnetic circuit assembly of the present invention;

[0045] Fig.14 It is a comparative diagram of the magnetic properties obtained by changing the thickness of the magnet when the thickness of the two magnetic conductive plates is equal;

[0046] Fig.15 It is a comparative schematic diagram of the magnetic properties obtained by changing the thickness of the magnet when the thickness of the two magnetic conductive plates are unequal;

[0047] Fig.16 It is a comparative simulation diagram of the impedance curve of whether the magnetic circuit component contains a short-circuit component;

[0048] Fig.17 It is a comparative simulation diagram of the SPL curve of whether the magnetic circuit component contains a short-circuit component;

[0049] Fig.18 is a schematic structural diagram of a twelfth embodiment of a magnetic circuit assembly in the present invention;

[0050] Fig.19 It is a cross-sectional view of the twelfth embodiment of the magnetic circuit assembly in the present invention. DETAILED DESCRIPTION

[0051] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It is to be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some structures related to the present application are shown in the accompanying drawings, rather than all structures. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0052] The terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0053] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0054] like Figures 3 to 12 As shown, the present application proposes a magnetic circuit assembly 100 , including a magnet 1 , a magnetic conductive plate 2 , a coil 3 and a short-circuit member 4 .

[0055] The magnetic conductive plate 2 is connected to the magnet 1 .

[0056] The coil 3 surrounds the outer circumference of the magnetic conductive plate 2 and is used to drive the magnet 1 and the magnetic conductive plate 2 to vibrate along the axial direction A.

[0057] The short-circuit element 4 is made of a conductive material and is a hollow ring structure, and is disposed in the alternating magnetic field generated when the coil 3 is energized.

[0058] A short-circuit member 4 made of conductive material is added to reduce the inductance of the coil 3 through the short-circuit member 4, so as to reduce the overall inductive reactance of the magnetic circuit assembly 100, thereby achieving and improving the magnetic performance.

[0059] As a preferred embodiment, the short-circuit member 4 surrounds the outside of the magnet 1 and is in direct contact with the magnet 1; and / or the short-circuit member 4 surrounds the outside of the magnetic conductive plate 2 and is in direct contact with the magnetic conductive plate 2; and / or the short-circuit member 4 surrounds the outside of the coil 3 and is in direct contact with the coil 3.

[0060] The short-circuit member 4 may be a hollow ring structure made of any conductive material such as copper, silver, aluminum or iron. In some embodiments, Figures 3 to 9 and Figure 11 to Figure 12 As shown, the short-circuit member 4 can be sleeved on the outer periphery of the magnet 1 and / or the magnetic conductive plate 2, and of course, copper can be directly electroplated on the outer periphery of the magnet 1 and / or the magnetic conductive plate 2 to form the short-circuit member; in other embodiments, such as Fig.10 As shown, the short-circuit member 4 can be sleeved on the outside of the coil 3. The coil 3 generates an alternating magnetic field when it is energized. Due to the different effects of the conductivity, position, thickness and other factors of the magnetic conductive plate 2, in theory, the position where the short-circuit member 4 appears can be within the range of the alternating magnetic field of the coil 3, and the short-circuit member 4 and the coil 3 are magnetically cross-linked. As a transformer secondary with one turn, the short-circuit member 4 will induce current. According to the experiment of the law of electromagnetic induction, it can be concluded that the magnetic field generated by this current has the effect of suppressing the alternating magnetic field generated by the coil 3, stabilizing the magnetic field, and reducing the inductance of the coil 3.

[0061] It should be noted that, since the material of the magnetic conductive plate 2 is generally steel, which is a conductive material, it has played a certain "short-circuit" effect, but since its conductivity is much different from that of copper, silver and other materials, the weakening effect on the inductance of the coil 3 is limited, so it is necessary to add a short-circuit 4 to strengthen the weakening effect on the inductance of the coil 3. First, since the short-circuit 4 is arranged in the alternating magnetic field generated after the coil 3 is energized, the short-circuit 4 and the coil 3 have mutual inductance, making the magnetic field relatively stable, reducing nonlinear distortion to a certain extent, especially for the second harmonic distortion, it has a certain effect; second, reducing the inductance of the coil 3, it plays a role in improving the mid-high frequency performance.

[0062] In some embodiments, Figures 3 to 6 As shown, the magnet assembly 5 is composed of at least two magnets 1 and a magnetic conductive plate 2 connected between two adjacent magnets 1. The two adjacent magnets 1 are arranged with the same poles facing each other, for example, both are N poles or S poles; the coil 3 surrounds the outer periphery of the magnetic conductive plate 2. Figure 5 As shown, a short-circuit member 4 is disposed on the periphery of the magnet 1 and the magnetic conductive plate 2, and the peripheries of the plurality of short-circuit members 4 are all flush; or Figure 3 and Figure 6 As shown, only the outer periphery of the magnetic conductive plate 2 is provided with a short-circuit member 4, and the outer peripheral surface of the short-circuit member 4 is flush with the outer peripheral surface of the magnet 1; or Figure 4It is shown that only the outer periphery of the magnet 1 is provided with a short-circuit member 4 , and the outer peripheral surface of the short-circuit member 4 is flush with the outer peripheral surface of the magnetic conductive plate 2 , and there is no unevenness, which effectively ensures the distance between the short-circuit member 4 and the coil 3 .

[0063] like Figures 3 to 5 As shown, a single coil magnetic circuit component 100 can be formed, such as Figure 6 As shown, a multi-coil magnetic circuit assembly 100 can also be formed. In the case of multiple coils, since the static magnetic fields of adjacent coils 3 are in opposite directions, currents in opposite directions will flow in the working state. Due to the mutual inductance between the coils 3 and the opposite directions of their self-induced electromotive forces, the total inductance of the coils 3 will also be reduced, thereby improving the high-frequency performance of the bone conduction product.

[0064] In other embodiments, Figures 7 to 10 As shown, a magnet assembly 5 is formed by two magnetic conductive plates 2 and a magnet 1 connected between two adjacent magnetic conductive plates 2; a coil 3 is correspondingly surrounded by the outer periphery of each magnetic conductive plate 2. A double-coil single-magnet magnetic circuit assembly 100 is provided, and the purpose of the double coil is to cancel the self-inductance and mutual inductance of the two coils 3, so as to achieve a smaller total inductance of the coil 3; at the same time, by adding a short-circuit member 4, the increase in the system impedance is made smaller, thereby reducing the overall inductive reactance of the magnetic circuit assembly 100.

[0065] Furthermore, outer circumferences of at least two coils 3 or outer circumferences of all coils 3 are connected to the same short-circuit member 4 .

[0066] The present application can also achieve and improve the magnetic performance by limiting the thickness ratio of the magnet 1 and the magnetic conductive plate 2, such as Figures 7 to 10 As shown, taking the double-coil single-magnetic steel magnetic circuit assembly 100 as an example, the thickness of the middle magnet 1 is h1, the thickness of the magnetic plate 2 located below is h2, and the thickness of the magnetic plate 2 located above is h3. It can be understood that the total thickness of the magnet assembly 5 is h1+h2+h3, which is the axial size of the magnet assembly 5. Fig.14 As shown in FIG. 1 , when the total thickness of the magnet assembly 5 remains unchanged, the magnetic properties vary with the ratio of the thickness h1 of the magnet 1 to the total thickness (h1+h2+h3) of the magnet assembly 5, wherein the thicknesses of the two magnetic conductive plates 2 are equal, i.e., h2=h3. Obviously, when the ratio of the thickness h1 of the magnet 1 to the total thickness (h1+h2+h3) is between 0.65 and 0.9, the magnetic properties are optimal. Fig.15As shown, when the thickness of the two magnetic conductive plates 2 is not equal, that is, h2≠h3, the thickness h2 of the magnetic conductive plate 2 is the same as the thickness before and after, that is, a fixed thickness. The influence of the thickness h1 of the magnet 1 and the thickness h3 of the other magnetic conductive plate 2 on the magnetic performance is discussed. It can be seen that the magnetic performance is relatively low, but the magnetic performance still has a peak value when h1 / (h1+h2+h3) is 0.65-0.9; and when the thickness of the two magnetic conductive plates 2 is not equal, the corresponding Ampere force provided by the two coils 3 is also different. At this time, due to the nonlinear effect of magnetic performance, the bone conduction sound device may have a large distortion on the second or even third harmonic. However, since the short-circuit member 4 is set in the alternating magnetic field generated after the coil 3 is energized, the short-circuit member 4 and the coil 3 have mutual inductance, making the magnetic field relatively stable, reducing the nonlinear distortion to a certain extent, especially for the second harmonic distortion, it has a certain effect.

[0067] The structure of the magnetic circuit assembly 100 is not limited, and more components may be added thereto.

[0068] like Fig.11 As shown, the magnetic circuit assembly 100 also includes two magnetic bowls 6, the openings of the two magnetic bowls 6 are arranged opposite to each other, and the two magnets 1 are respectively fitted and arranged in the two magnetic bowls 6; the short-circuit member 4 is arranged on the outside of the magnetic plate 2 and may not contact the magnetic bowls 6, and the magnetic bowls 6 are used to increase the overall magnetic performance.

[0069] like Fig.12 As shown, the magnetic bowl 6 includes a base plate 601 and a side plate 602 in an annular shape with the base plate 601, and the side plate 602 is connected to the base plate 601 at an angle. Fig.11 As shown, the side plate 602 extends between the coil 3 and the magnetic circuit assembly 100; in other embodiments, as Fig.12 As shown, the side plate 602 extends to the outside of the coil 3 and is arranged opposite to the outer peripheral surface of the magnetic conductive plate 2, and a magnetic gap 7 is formed between the side plate 602 and the magnetic conductive plate 2; the coil 3 and the short-circuit member 4 are located in the magnetic gap 7.

[0070] like Fig.13 As shown, the present application also proposes a magnetic circuit assembly 200 , including an upper magnet 101 , a lower magnet 102 , a magnetic conductive plate 2 , a coil 3 and a short-circuit member 4 .

[0071] The lower magnet 102 and the upper magnet 101 are disposed with the same poles facing each other and spaced apart.

[0072] The magnetic conductive plate 2 is connected to the lower magnet 102 .

[0073] The coil 3 is connected to the magnetic conductive plate 2 and surrounds the outer circumference of the lower magnet 102 , and is used to drive the upper magnet 101 to vibrate along the axial direction A.

[0074] The short-circuit element 4 is made of a conductive material and is a planar plate-shaped structure, and is disposed in the alternating magnetic field generated when the coil 3 is energized.

[0075] A short-circuit member 4 made of conductive material is added to reduce the inductance of the coil 3 through the short-circuit member 4, so as to reduce the overall inductive reactance of the magnetic circuit assembly 100, thereby achieving and improving the magnetic performance.

[0076] As a preferred embodiment, the short-circuit member 4 is disposed inside the coil 3 and spaced apart from the upper magnet 101 .

[0077] The material of the short-circuit member 4 can be a planar plate structure made of any conductive material such as copper, aluminum, iron, etc., which can be connected to the upper end of the coil 3; of course, it can also be connected to the lower end of the coil 3. The coil 3 generates an alternating magnetic field when it is energized. Due to the different effects of the conductivity, position, thickness and other factors of the magnetic conductive plate 2, the short-circuit member 4 can be located in the alternating magnetic field of the coil 3 in theory, and the short-circuit member 4 and the coil 3 are magnetically cross-linked. As a transformer secondary with one turn, the short-circuit member 4 will induce current. According to the law of electromagnetic induction, the magnetic field generated by this current has the function of suppressing the alternating magnetic field generated by the coil 3, stabilizing the magnetic field, and reducing the inductance of the coil 3.

[0078] The structure of the magnetic circuit assembly 200 is not limited, and more components may be added thereto.

[0079] like Fig.13 As shown, the magnetic circuit assembly 200 further includes a magnetic bowl 6, which is used to increase the overall magnetic performance. The upper magnet 101 is fitted inside the magnetic bowl 6, and a magnetic gap 7 is formed between the magnetic bowl 6 and the magnetic plate 2; the coil 3 and the short-circuit member 4 are located in the magnetic gap 7.

[0080] According to the structure of the magnetic circuit components mentioned above, when the short-circuit component 4 in the magnetic circuit components 100 and 200 is set in the magnetic gap 7, the non-magnetic and non-magnetic conductive part will increase, and the corresponding magnetic properties will be reduced, and the intermediate frequency sensitivity may decrease; and for the intermediate frequency sensitivity, the main influencing factor is still the parameter BL of the magnetic properties, so in general, there may be a certain decline in the intermediate frequency, and it is necessary to comprehensively consider and introduce the formula for the influence of the short-circuit component 4 on the impedance.

[0081] Ignoring the motional impedance of coil 3 and short-circuit element 4 in the high frequency band, the electrical impedance at both ends of coil 3 can be obtained as follows:

[0082] Z=R1+jωL1+ω 2 M 2 / (R2+jωL2)

[0083] Where R1 is the resistance of coil 3, L1 is the self-inductance of coil 3, R2 is the resistance of short-circuit element 4, L2 is the self-inductance of short-circuit element 4; M is the mutual inductance of coil 3 and short-circuit element 4; j represents the imaginary part; ω = 2πf0;

[0084] Let K 2 =M 2 / L1L2, we can get

[0085] Z=R1+(K 2 R2L1 / L2) / [1+(R2 / ωL2) 2 ]+jωL1{1-K 2 / [1+(R2 / ωL2) 2 ]};

[0086] When the frequency is low, ωL2>>R2, Z≈R1+jωL1, which means that the short-circuit element 4 has little effect at low frequencies, but not at high frequencies.

[0087] Z=R1+K 2 R2L1 / L2+jωL1(1-K 2 );

[0088] After the coil 3 and the short-circuit element 4 are coupled, the last term can be reset to zero, thereby achieving the purpose of reducing the inductance of the coil 3.

[0089] like Fig.16 and Fig.17 As shown, it can be seen that the inductance of the coil 3 after adding the short-circuit element 4 is lower, resulting in a slower rise in impedance in the high frequency band, which makes the SPL curve perform better in the high frequency band.

[0090] like Fig.18 As shown, the present application also proposes a bone conduction sound generating device, including a magnetic circuit assembly 100; or, including a magnetic circuit assembly 200. It also includes a housing 300 and a spring 400.

[0091] The housing 300 includes an inner cavity 301 for mounting the magnetic circuit assembly 100 or the magnetic circuit assembly 200 , and is preferably an annular housing 300 , whose cross-sectional shape may be, for example, circular, elliptical, or racetrack-shaped.

[0092] The spring 400 is connected between the housing 300 and the magnetic circuit assembly 100 or the magnetic circuit assembly 200 , and its cross-sectional shape corresponds to the cross-sectional shape of the housing 300 , for example, it may be circular, elliptical or racetrack-shaped.

[0093] The housing 300 is made of a non-magnetic material or a magnetic material. Fig.19As shown, the inner cavity 301 has a first open end 302 and a second open end 303 at both ends thereof, and the number of the elastic sheet 400 is at least one, which can be arranged at the first open end 302 and / or the second open end 303 .

[0094] like Fig.18 As shown, the spring piece 400 includes an outer bracket 401 fixed relatively to the shell 300, an inner bracket 402 arranged in the outer bracket 401, and an elastic arm 403 connected between the outer bracket 401 and the inner bracket 402. The outer bracket 401 is connected to the shell 300, for example, by gluing. The inner bracket 402 is connected to the magnetic circuit assembly 100 or the magnetic bowl 6 in the magnetic circuit assembly 200 through the gasket 500, such as by gluing. Preferably, the number of spring pieces 400 is two, and a double spring piece structure is adopted to ensure the stability of the magnetic circuit assembly and improve the reliability of the product.

[0095] Embodiment 1:

[0096] refer to Figure 3 A magnetic circuit assembly 100 includes a magnet 1, a magnetic conductive plate 2, a coil 3 and a short-circuit member 4.

[0097] The magnetic conductive plate 2 is connected to the magnet 1 .

[0098] The coil 3 surrounds the outer circumference of the magnetic conductive plate 2 .

[0099] The short-circuit element 4 is made of a conductive material and is a hollow ring structure, and is disposed in the alternating magnetic field generated when the coil 3 is energized.

[0100] In this embodiment, there are two magnets 1, one magnetic conductive plate 2, and one coil 3. The magnet assembly 5 is composed of two magnets 1 and a magnetic conductive plate connected between two adjacent magnets 1, and there is one short-circuit member 4, which can be sleeved on the outside of the magnetic conductive plate 2 or electroplated on the outside of the magnetic conductive plate 2. It can be understood that one coil 3 surrounds the outer periphery of the short-circuit member 4, that is, the short-circuit member 4 is arranged in the alternating magnetic field generated when the coil 3 is energized.

[0101] When the coil 3 is energized, an alternating magnetic field is generated. The short-circuit element 4, as a turn of the transformer secondary, will induce a current. The magnetic field generated by this current has the effect of suppressing the alternating magnetic field generated by the coil 3 and stabilizing the magnetic field, thereby effectively reducing the inductance of the coil 3, thereby reducing the overall inductive reactance of the magnetic circuit assembly 100, and achieving and improving the magnetic performance.

[0102] Embodiment 2:

[0103] refer to Figure 4 , a magnetic circuit assembly 100, based on the first embodiment, differs in that:

[0104] There are two short-circuit members 4, which can be sleeved on the outside of the two magnets 1 or arranged on the outside of the magnets 1 by electroplating. It can be understood that the short-circuit member 4 is also arranged in the alternating magnetic field generated after the coil 3 is energized, and the alternating magnetic field generated by the coil 3 is suppressed by the two short-circuit members 4 at the same time, further effectively reducing the inductance of the coil 3, so as to reduce the overall inductive reactance of the magnetic circuit assembly 100, and achieve and improve the magnetic performance.

[0105] Embodiment three:

[0106] refer to Figure 5 , a magnetic circuit assembly 100, based on the first embodiment, differs in that:

[0107] There are three short-circuit members 4, which can be sleeved on the outside of two magnets 1 and one magnetic conductive plate 2, or can be electroplated on the outside of the magnet 1 and the magnetic conductive plate 2. It can be understood that the short-circuit members 4 are also arranged in the alternating magnetic field generated after the coil 3 is energized. The three short-circuit members 4 simultaneously suppress the alternating magnetic field generated by the coil 3, further effectively reducing the inductance of the coil 3, thereby reducing the overall inductive reactance of the magnetic circuit assembly 100, and achieving and improving the magnetic performance.

[0108] Embodiment 4:

[0109] refer to Figure 6 , a magnetic circuit assembly 100, based on the first embodiment, differs in that:

[0110] There are three magnets 1, two magnetic conductive plates 2, and two coils 3. The magnetic conductive plates 2 are respectively connected between two adjacent magnets 1, and there are two short-circuit members 4, which can be sleeved on the outside of the magnetic conductive plates 2 or arranged on the outside of the magnetic conductive plates 2 by electroplating. It can be understood that the two coils 3 surround the outer periphery of the two short-circuit members 4, that is, the short-circuit members 4 are arranged in the alternating magnetic field generated when the coils 3 are energized.

[0111] Since there are two coils 3 and the directions of the static magnetic fields of adjacent coils 3 are opposite, currents in opposite directions will flow in the working state. Due to the mutual inductance between the coils 3 and the opposite directions of their self-induced electromotive forces, the total inductance of the coils 3 will also be reduced. The alternating magnetic field generated by the coils 3 is further suppressed by two short-circuit members 4, which more effectively reduces the inductance of the coils 3, thereby reducing the overall inductive reactance of the magnetic circuit assembly 100, achieving and improving the magnetic performance, and thus improving the high-frequency performance of the bone conduction product.

[0112] Embodiment five:

[0113] refer to Figure 7 , a magnetic circuit assembly 100, based on the first embodiment, differs in that:

[0114] There is one magnet 1, two magnetic conductive plates 2, and two coils 3. The magnet assembly 5 is composed of two magnetic conductive plates 2 and one magnet 1 connected between two adjacent magnetic conductive plates 2. The two coils 3 surround the outer periphery of the magnetic conductive plates 2 respectively. There is one short-circuit member 4, which can be sleeved on the outside of the magnet 1 or can be arranged on the outside of the magnet 1 by electroplating. It can be understood that the short-circuit member 4 is also arranged in the alternating magnetic field generated after the coil 3 is energized. The alternating magnetic field generated by the coil 3 is suppressed by a short-circuit member 4, which effectively reduces the inductance of the coil 3, thereby reducing the overall inductive reactance of the magnetic circuit assembly 100 and achieving and improving the magnetic performance.

[0115] In this embodiment, the thicknesses of the two magnetic conductive plates 2 are equal, that is, h2=h3; the thickness of the magnet 1 is 65%-90% of the total thickness of the magnet assembly, so that it can achieve a better magnetic performance state.

[0116] Embodiment six:

[0117] refer to Figure 8 , a magnetic circuit assembly 100, based on the fourth embodiment, differs in that:

[0118] There are two short-circuit members 4, which can be sleeved on the outside of the two magnetic conductive plates 2, or can be electroplated on the outside of the magnetic conductive plates 2. It can be understood that the short-circuit member 4 is also arranged in the alternating magnetic field generated after the coil 3 is energized, and the alternating magnetic field generated by the coil 3 is suppressed by the two short-circuit members 4 at the same time, further effectively reducing the inductance of the coil 3, so as to reduce the overall inductive reactance of the magnetic circuit assembly 100, and achieve and improve the magnetic performance.

[0119] Embodiment seven:

[0120] refer to Fig. 9 , a magnetic circuit assembly 100, based on the fifth embodiment, differs in that:

[0121] There are three short-circuit members 4, which can be sleeved on the outside of two magnetic conductive plates 2 and one magnet 1, or can be electroplated on the outside of the magnet 1 and the magnetic conductive plate 2. It can be understood that the short-circuit members 4 are also arranged in the alternating magnetic field generated after the coil 3 is energized. The three short-circuit members 4 simultaneously suppress the alternating magnetic field generated by the coil 3, further effectively reducing the inductance of the coil 3, thereby reducing the overall inductive reactance of the magnetic circuit assembly 100, and achieving and improving the magnetic performance.

[0122] Embodiment eight:

[0123] refer to Fig.10 , a magnetic circuit assembly 100, based on the fifth embodiment, differs in that:

[0124] The short-circuit component 4 can be sleeved on the outside of the two coils 3. It can be understood that the short-circuit component 4 is also arranged in the alternating magnetic field generated after the coil 3 is energized. The alternating magnetic field generated by the coil 3 is suppressed by a short-circuit component 4, which effectively reduces the inductance of the coil 3, thereby reducing the overall inductive reactance of the magnetic circuit assembly 100, thereby achieving and improving the magnetic performance.

[0125] Embodiment nine:

[0126] refer to Fig.11 , a magnetic circuit assembly 100, based on the first embodiment, differs in that:

[0127] The magnetic circuit assembly 100 also includes two magnetic bowls 6, the openings of the two magnetic bowls 6 are arranged opposite to each other, and the two magnets 1 are respectively fitted and arranged in the two magnetic bowls 6, wherein the magnetic bowl 6 includes a base plate 601 and a side plate 602 connected to the base plate 601 at an angle, and the side plate 602 extends between the coil 3 and the magnetic circuit assembly 100, and the magnetic performance of the magnetic circuit assembly 100 can be increased by the magnetic bowl 6.

[0128] Embodiment ten:

[0129] refer to Fig.12 , a magnetic circuit assembly 100, based on the first embodiment, differs in that:

[0130] The magnetic circuit assembly 100 also includes two magnetic bowls 6, the openings of the two magnetic bowls 6 are arranged opposite to each other, and the two magnets 1 are respectively arranged in the two magnetic bowls 6, wherein the magnetic bowl 6 includes a base plate 601 and a side plate 602 connected to the base plate 601 at an angle, the side plate 602 extends to the outside of the coil 3 and is arranged opposite to the magnetic plate 2, and a magnetic gap 7 is formed between the side plate 602 and the magnetic plate 2; the coil 3 and the short-circuit member 4 are located in the magnetic gap 7.

[0131] Embodiment eleven:

[0132] refer to Fig.13 A magnetic circuit assembly 200 includes an upper magnet 101, a lower magnet 102, a magnetic conductive plate 2, a coil 3 and a short-circuit member 4.

[0133] The lower magnet 102 and the upper magnet 101 are disposed with the same poles facing each other and spaced apart.

[0134] The magnetic conductive plate 2 is connected to the lower magnet 102 .

[0135] The coil 3 is connected to the magnetic conductive plate 2 and surrounds the outer circumference of the lower magnet 102 .

[0136] The short-circuit element 4 is made of a conductive material and is a planar plate-shaped structure, and is disposed in the alternating magnetic field generated when the coil 3 is energized.

[0137] In this embodiment, a magnetic bowl 6 is also included, and the upper magnet 101 is fitted inside the magnetic bowl 6. There is one short-circuit member 4, which is located in the magnetic gap 7 formed between the magnetic bowl 6 and the magnetic plate 2, and can be connected to the inner side of the coil 3 and spaced apart from the upper magnet 101. It can be understood that the short-circuit member 4 is connected to the upper end of the coil 3 so that it is also located in the alternating magnetic field generated when the coil 3 is energized.

[0138] When the coil 3 is energized, an alternating magnetic field is generated. The short-circuit element 4, as a turn of the transformer secondary, will induce a current. The magnetic field generated by this current has the effect of suppressing the alternating magnetic field generated by the coil 3 and stabilizing the magnetic field, thereby effectively reducing the inductance of the coil 3, thereby reducing the overall inductive reactance of the magnetic circuit assembly 200, and achieving and improving the magnetic performance.

[0139] Embodiment 12:

[0140] See also Fig.18 and Fig.19 A bone conduction sound generating device includes the magnetic circuit assembly 200 in the first embodiment, which also includes a shell 300 and a spring 400.

[0141] The housing 300 includes an inner cavity 301 for mounting the magnetic circuit assembly 100 or the magnetic circuit assembly 200 , and is preferably an annular housing 300 , and its cross-sectional shape is, for example, circular.

[0142] The spring piece 400 is connected between the housing 300 and the magnetic circuit assembly 100 or the magnetic circuit assembly 200 , and its cross-sectional shape corresponds to the cross-sectional shape of the housing 300 , and is also circular.

[0143] The housing 300 is made of non-magnetic material or magnetic material. The inner cavity 301 has a first opening end 302 and a second opening end 303 at both ends. The number of the spring sheet 400 is one, the spring sheet 400 is arranged at the first opening end 302, and the magnetic conductive plate 2 is arranged at the second opening end 303.

[0144] Embodiment 13:

[0145] A bone conduction earphone comprises the bone conduction sound generating device described above.

[0146] The above are only specific implementations of the present invention, and any improvements made based on the concept of the present invention are considered to be within the protection scope of the present invention.

Claims

1. A magnetic circuit component, characterized in that: include: A magnetic circuit assembly, comprising a magnet and a magnetic conductive plate connected to the magnet, wherein the magnet is magnetized along the axis direction of the magnetic circuit assembly; A coil, surrounding the outer circumference of the magnetic conductive plate, for driving the magnetic circuit assembly to vibrate along the axis direction; and The short-circuit component is arranged in the alternating magnetic field generated after the coil is energized. The short-circuit component is in a hollow ring structure and is made of conductive material.

2. The magnetic circuit assembly according to claim 1, characterized in that: The short-circuit element surrounds the outside of the magnet and is in direct contact with the magnet; and / or, The short-circuit element surrounds the outer side of the magnetic conductive plate and is in direct contact with the magnetic conductive plate; and / or, The short-circuit element surrounds the outer side of the coil and is in direct contact with the coil.

3. The magnetic circuit assembly according to claim 1, characterized in that: The magnet assembly is composed of at least two magnets and a magnetic conductive plate connected between two adjacent magnets, and the two adjacent magnets are arranged with the same poles facing each other; the coil surrounds the outer circumference of the magnetic conductive plate.

4. The magnetic circuit assembly according to claim 3, characterized in that: The outer periphery of the magnet and the magnetic conductive plate are each provided with a short-circuit member; or, The short-circuit member is disposed only on the periphery of the magnetic conductive plate, and the outer peripheral surface of the short-circuit member is flush with the outer peripheral surface of the magnet; or The short-circuit member is disposed only on the outer periphery of the magnet, and the outer peripheral surface of the short-circuit member is flush with the outer peripheral surface of the magnetic conductive plate.

5. The magnetic circuit assembly according to claim 1, characterized in that: The magnet assembly is composed of two magnetic conductive plates and the magnet connected between two adjacent magnetic conductive plates; a coil is correspondingly surrounded by the outer circumference of each magnetic conductive plate.

6. The magnetic circuit assembly according to claim 5, characterized in that: The outer circumferences of at least two of the coils or the outer circumferences of all of the coils are connected to the same short-circuit element.

7. The magnetic circuit assembly according to claim 5, characterized in that: The thickness of the magnet is 65%-90% of the total thickness of the magnet assembly.

8. The magnetic circuit assembly according to claim 3, characterized in that: It also includes two magnetic bowls, the openings of the two magnetic bowls are arranged opposite to each other, and the two magnets are respectively fitted and arranged in the two magnetic bowls; the short-circuit member is arranged on the outside of the magnetic plate.

9. The magnetic circuit assembly according to claim 8, characterized in that: The magnetic bowl comprises a base plate and an annular side plate, wherein the side plate is connected to the base plate at an angle; The side plate extends between the coil and the magnetic circuit assembly; or, The side plate extends to the outside of the coil and is arranged opposite to the outer peripheral surface of the magnetic conductive plate, and a magnetic gap is formed between the side plate and the magnetic conductive plate; the coil and the short-circuit member are located in the magnetic gap.

10. A bone conduction sound device, characterized in that: comprising a magnetic circuit assembly as described in any one of claims 1 to 9; a housing, comprising an inner cavity for mounting the magnetic circuit assembly, wherein the coil is relatively fixed to the housing; and The spring piece is connected between the shell and the magnetic circuit assembly. The spring piece includes an outer bracket fixed relatively to the shell, an inner bracket arranged in the outer bracket, and an elastic arm connected between the outer bracket and the inner bracket. The magnetic circuit assembly is connected to the inner bracket.

11. The bone conduction sound generating device according to claim 10, characterized in that: The inner cavity has a first open end and a second open end located at both ends thereof, and each of the first open end and the second open end is provided with a spring sheet, and the two spring sheets are respectively connected to the two ends of the magnetic circuit component.

12. A bone conduction earphone, characterized in that: The invention comprises a bone conduction sound generating device as described in any one of claims 10 to 11.

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