Moving iron unit and hearing aid

Abstract

The utility model discloses a moving iron unit and a hearing aid, and relates to the technical field of earphone accessories, the moving iron unit comprises a housing, a diaphragm, a balance sheet, a permanent magnet and a coil, a cavity is formed in the housing; the vibrating diaphragm is movably arranged on the shell; the balance sheet is arranged in the cavity, one end of the balance sheet is in driving connection with the vibrating diaphragm so as to drive the vibrating diaphragm to vibrate in a reciprocating manner, and the magnetic conductivity value range of the material of the balance sheet is 500-80000H / m; the permanent magnet is arranged at the end part of the balance sheet in a sleeving manner and is in clearance fit with the balance sheet to form a movable space; the coil is sleeved on the periphery of the balance sheet, and the magnetic protection layer wraps the whole periphery of all coil structures and is in clearance fit with the balance sheet. According to the technical scheme, the magnetic materials with high magnetic induction intensity and high magnetic conductivity are adopted to enable the magnetic protection layer to concentrate energy, so that the magnetic attraction effect of the balance piece in the moving iron unit is improved, energy output to the moving iron unit by a hearing aid and an earphone system is saved, and the internal energy application efficiency of the moving iron unit is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a moving iron unit and a hearing aid, earphone accessory technical field application. BACKGROUND

[0002] With the continuous development of hearing aids and earphone technology, the optimization of the performance of the sound source balance sheet as a key component in these devices is crucial to the improvement of overall sound quality and device performance. The main function of the sound source balance sheet is to maintain the balance of the signal during the transmission of the audio signal, reduce distortion and improve sound quality.

[0003] The common sound source balance sheet materials on the market mainly include silicon steel and ferrite, etc. These materials can meet the basic functional requirements of the sound source balance sheet to some extent, but have certain limitations. Specifically, the magnetic attraction of the balance sheet of different materials to the magnetic lines emitted around the coil is not ideal, resulting in that the magnetic lines cannot be widely and effectively guided and concentrated therein. SUMMARY

[0004] The main purpose of the utility model is to provide a moving iron unit and a hearing aid, which aims to improve the magnetic attraction effect of the balance sheet in the moving iron unit.

[0005] To achieve the above purpose, the moving iron unit provided by the utility model comprises:

[0006] A shell forms a cavity inside;

[0007] A diaphragm is movably installed on the shell;

[0008] A balance sheet is arranged in the cavity, and one end of the balance sheet is drivingly connected with the diaphragm to drive the reciprocating vibration of the diaphragm, and the magnetic permeability value of the balance sheet material ranges from 500 to 80000H / m;

[0009] A permanent magnet is sleeved on the end of the balance sheet and cooperates with the balance sheet with a gap to form a moving space; and

[0010] A coil is sleeved on the outer periphery of the balance sheet and cooperates with the balance sheet with a gap.

[0011] In an embodiment, the saturation magnetic induction intensity value of the balance sheet material tends to be large and is higher than 0.5T.

[0012] In an embodiment, the material of the balance sheet is selected from at least one of amorphous product material nanocrystalline, iron-based amorphous, cobalt-based amorphous, armature and permalloy.

[0013] In an embodiment, the balance sheet is arranged in a "mountain" shape or a U-shaped structure.

[0014] In an embodiment, the balance sheet comprises a fixed part and a movable part connected to each other, the fixed part is fixed in the cavity, the free end of the movable part is matched with the permanent magnet gap, and reciprocates in the active space.

[0015] In an embodiment, the moving iron unit further comprises a magnetic shield layer, the magnetic shield layer is arranged on the outer periphery of the coil, and the magnetic permeability of the material of the magnetic shield layer ranges from 500 to 80000 H / m.

[0016] In an embodiment, the saturation magnetic induction of the material of the magnetic shield layer is large and higher than 0.5T.

[0017] In an embodiment, the material of the magnetic shield layer is selected from at least one of amorphous material, nanocrystalline, iron-based amorphous, cobalt-based amorphous, armature, and permalloy.

[0018] In an embodiment, the moving iron unit further comprises a driving rod, two ends of the driving rod are respectively fixedly connected with the diaphragm and the balance sheet.

[0019] In an embodiment, the included angle between the driving rod and the plane of the balance sheet is a right angle.

[0020] The utility model also proposes a kind of hearing aid, and the hearing aid includes the moving iron unit of any one of the above embodiment.

[0021] In the technical scheme of the utility model, the diaphragm is movably installed above the cavity in the shell of the moving iron unit, the balance sheet is further arranged in the cavity, and the permanent magnet and the coil are arranged on the outer periphery of the balance sheet. Specifically, when current is passed in the coil, the balance sheet drives the diaphragm to vibrate under the action of magnetic force, thereby generating sound effect. By sleeving the permanent magnet on the outer periphery of the balance sheet, the balance sheet can produce up-down reciprocating motion in the active space under the action of surrounding magnetic field, so that the diaphragm can produce cyclic reciprocating vibration. In the present scheme, the balance sheet is selected from a material with magnetic permeability ranging from 500 to 80000 H / m, which helps to improve the magnetic property of the balance sheet, so that the moving iron unit can more effectively utilize magnetic field and improve overall acoustic performance. This is because the balance sheet with high magnetic permeability is more sensitive to magnetic field, and the moving iron unit can more accurately respond to slight electrical signal changes, thereby improving the restoration degree and detail performance of sound. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings described below are only some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative labor.

[0023] Figure 1 The structure schematic diagram of the moving iron unit provided by the present application is provided.

[0024] Figure 2 The structure explosion diagram of the balance sheet, the coil and the magnetic shield layer in the moving iron unit provided by the present application is provided.

[0025] Figure 3 The cooperation structure schematic diagram of the balance sheet and the driving rod in another embodiment of the moving iron unit provided by the present application is provided.

[0026] Figure 4 The local structure schematic diagram of the balance sheet in another embodiment of the moving iron unit provided by the present application is provided.

[0027] Explanation of the drawing reference number:

[0028] 100, moving iron unit; 1, shell; 2, diaphragm; 3, balance sheet; 31, fixed part; 32, movable part; 4, permanent magnet; 5, coil; 6, magnetic shield layer; 7, driving rod.

[0029] The realization, functional characteristics and advantages of the present application will be further described with reference to the embodiments and the drawings. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0031] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0032] In addition, if the description of "first", "second" and the like is involved in the embodiments of the utility model, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the same or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the utility model.

[0033] The common sound source balance sheet material in the market at present mainly includes silicon steel and ferrite and the like, which can meet the basic functional requirements of sound source balance sheet to some extent, but there is certain limitation. It is specifically shown that the magnetic attraction of the balance sheet of different materials to the magnetic force line emitted around the coil is not ideal, which leads to that the magnetic force line cannot be widely and effectively guided and bunched.

[0034] The utility model provides a kind of moving iron unit.

[0035] Please refer to Figure 1 In an embodiment of the utility model, the moving iron unit 100 includes:

[0036] Shell 1, cavity is formed inside;

[0037] Diaphragm 2, movably mounted on shell 1;

[0038] Balance sheet 3, is located in cavity, and one end of balance sheet 3 is drivenly connected with diaphragm 2, to drive the reciprocating vibration of diaphragm 2, the magnetic permeability value range of balance sheet 3 material is 500-80000H / m;

[0039] Permanent magnet 4, is sleeved in the end of balance sheet 3, and gap cooperation with balance sheet 3 to form activity space;And

[0040] Coil 5, is sleeved in the outer periphery of balance sheet 3, and gap cooperation with balance sheet 3.

[0041] The utility model discloses a technical scheme, in the shell 1 of moving iron unit 100 inside, the diaphragm 2 movable installation is above the cavity, still be equipped with the balance sheet 3 in the cavity, and is equipped with permanent magnet 4 and coil 5 on the outer periphery of balance sheet 3. Specifically, when the current is passed in coil 5, balance sheet 3 drives the diaphragm 2 to vibrate under the action of magnetic force, thereby generating the sound effect. By the permanent magnet 4 of setting in the outer periphery of balance sheet 3, make balance sheet 3 can produce up-down reciprocating motion in the activity space under the action of surrounding magnetic field, and further make the diaphragm 2 can produce cyclic reciprocating vibration. The balance sheet 3 of this scheme selects the materiality of magnetic permeability in 500-80000H / m range, helps to improve the magnetism of balance sheet 3, makes moving iron unit 100 can utilize the magnetic field more effectively, improves the overall acoustic performance. This is because, the sensitivity of this high magnetic permeability balance sheet 3 to magnetic field is higher, and moving iron unit 100 can respond to the tiny electric signal change more accurately, thereby improving the degree of sound restoration and detail performance.

[0042] Specifically, the material of the balance sheet 3 is not limited, for example, it can be soft magnetic alloy, amorphous alloy or nanocrystalline material, etc. The soft magnetic alloy can be permalloy, iron-aluminum alloy or cobalt-based alloy, etc. In addition, the high magnetic permeability balance sheet 3 helps to absorb the flow of magnetic lines in the balance sheet 3, reducing the magnetic field scattering and reducing the magnetic leakage phenomenon. Since the balance sheet 3 can more effectively drive the diaphragm 2 to reciprocate, the acoustic performance of the moving iron unit 100 is improved, including better frequency response, lower distortion and higher sound pressure level. In addition, the gap cooperation between the permanent magnet 4 and the balance sheet 3 and the gap cooperation between the coil 5 and the balance sheet 3 make the structure of the moving iron unit 100 more compact, which is beneficial to realize high-performance acoustic output in limited space and meet the application in hearing aids and other small products. It should be noted that the high magnetic permeability balance sheet 3 can design a more compact magnetic circuit, reduce the number of turns of the coil 5, thereby reducing the size and weight of the moving iron unit 100, making it suitable for portable audio devices.

[0043] In the embodiment of the utility model, the value of the saturation magnetic induction intensity of the material of the balance sheet 3 is greater than 0.5T, and high saturation magnetic induction intensity means that the balance sheet 3 can accommodate more magnetic flux without reaching saturation, thereby improving the utilization efficiency of magnetic energy and enhancing the acoustic output of the moving iron unit 100. This is because there is a certain relationship between magnetic permeability (Ur) and magnetic saturation induction intensity (Bs), when the wire coil 5 passes through a small current, the magnetic field intensity (H) of the coil 5 is proportional to the current, and the magnetic induction intensity (B) of the balance sheet 3 increases with the increase of the current. However, when the current increases to a certain extent, the magnetic induction intensity reaches a maximum (Bm), at this time even if the magnetic field intensity (H) continues to increase, the magnetic induction intensity (B) no longer increases. Therefore, the material with high magnetic permeability is more likely to reach the magnetic saturation state under a strong magnetic field, that is, its magnetization intensity cannot linearly increase with the increase of the external magnetic field, so when the magnetic saturation induction intensity is above 0.5T (Tesla), the magnetic induction efficiency of the balance sheet 3 can be improved.

[0044] In the embodiment of the utility model, the material of the balance sheet 3 is selected from at least one of amorphous product material nanocrystalline, iron-based amorphous, cobalt-based amorphous, armature and permalloy, and the magnetic permeability (H / m) of these materials can all reach an extremely high value, which can be selected according to actual needs. When permalloy is selected, the value of its magnetic permeability can be adjusted by changing the percentage of nickel-iron alloy in the alloy material. Specifically, for the selection of the material of the balance sheet 3, in the case that the magnetic permeability and the magnetic saturation induction intensity meet the requirements, the influence of the coercive force and the resistivity on the magnetic absorption of the balance sheet 3 should also be considered, and the material with smaller coercive force and larger resistivity is preferably selected. This is because smaller coercive force means that less energy is required for magnetization or demagnetization, so the electromagnetic equipment made of such material has lower energy consumption during operation; and because the coercive force is small, the balance sheet 3 can quickly reach magnetic saturation or recover from the saturation state. High resistivity helps to reduce eddy current loss, because eddy current is a closed current loop generated in a conductive material due to a changing magnetic field, and high resistivity limits the formation of such current, reducing heat loss.

[0045] In the embodiment of the utility model, please refer to Figure 2 And Figure 3 The balance sheet 3 is arranged in a "mountain" shape or a U-shaped structure, which can provide stronger mechanical support force, so that the balance sheet 3 can maintain the stability of shape and position when subjected to cyclic vibration or impact, thereby improving the overall durability of the moving iron unit 100. Moreover, this structure helps to increase air circulation, promote heat dissipation and reduce the temperature rise of the balance sheet 3.

[0046] In the embodiment of the utility model, please refer to Figure 3, the balance sheet 3 includes the fixed part 31 and the movable part 32 connected to each other, the fixed part 31 is fixed in the cavity, and the free end of the movable part 32 is gap matched with the permanent magnet 4 and reciprocates in the active space. In the scheme, the free end of the movable part 32 is gap matched with the permanent magnet 4, so that the balance sheet 3 can quickly respond to the electromagnetic signal, thereby improving the response speed of the moving iron unit 100 and ensuring clear and non-delayed sound quality. Through the reciprocating movement of the movable part 32 in the active space, the vibration mode of the diaphragm 2 can be accurately controlled, unnecessary vibration and harmonic distortion can be reduced, and the purity of the sound can be improved.

[0047] In the embodiment of the utility model, please refer to Figure 1 and Figure 2 , the moving iron unit 100 further includes a magnetic shield layer 6, the magnetic shield layer 6 is arranged on the outer periphery of the coil 5, and the magnetic permeability value of the material of the magnetic shield layer 6 ranges from 500 to 80000 H / m. In this way, by arranging the magnetic shield layer 6 on the outer periphery of the coil 5, the magnetic field can be effectively bound, the magnetic leakage to the external space is reduced, the magnetic flux can be more effectively guided through the balance sheet 3, the magnetic flux leakage is reduced, and thus the utilization rate of the magnetic flux is improved, and the sound production efficiency of the moving iron unit 100 is improved. In the scheme, by increasing the magnetic shield layer 6, the magnetic flux leakage can be reduced and the utilization rate of the magnetic flux can be improved, and the magnetic shield layer 6 is helpful to improve the acoustic output of the moving iron unit 100, so that the sound is more full and pure.

[0048] In the embodiment of the utility model, the saturation magnetic induction intensity value of the material of the magnetic shield layer 6 is greater than 0.5T, and the high saturation magnetic flux density of the magnetic shield layer 6 means that it can store more magnetic energy in unit volume, which is important for the moving iron unit 100 to improve the overall energy conversion efficiency by using a coil 5 with fewer turns. Since the magnetic shield layer 6 can store more magnetic energy, the moving iron unit 100 can provide more output power when converting electrical signals into acoustic signals, which is particularly important for application scenarios that require high loudness or dynamic range.

[0049] In the embodiment of the utility model, the material of the magnetic shield layer 6 is selected from at least one of amorphous product material nanocrystalline, iron-based amorphous, cobalt-based amorphous, armature and permalloy, and similarly, the magnetic shield layer 6 can be made of the same material as the balance sheet 3, so as to have a higher saturation magnetic induction intensity while having a higher magnetic permeability. The nanocrystalline, armature and permalloy all have extremely high magnetic permeability, which means that the magnetic shield layer 6 can more effectively guide the magnetic force lines, reduce magnetic flux leakage and improve the efficiency of the moving iron unit 100. Moreover, the magnetic hysteresis loss of materials such as nanocrystalline and permalloy is low, which helps to reduce energy loss.

[0050] In the embodiment of the utility model, please refer to Figure 1 and Figure 3The moving iron unit 100 further comprises driving rods 7, two ends of the driving rods 7 are fixedly connected with the diaphragm 2 and the balance piece 3 respectively. In specific implementation, the number of the driving rods 7 is not specifically limited, for example, two, three or more than three driving rods 7 can be provided. When two driving rods 7 are provided, the included angle between the driving rods 7 and the plane where the movable part 32 is located is equal. The included angle between the driving rods 7 and the plane where the movable part 32 is located is equal, the total force acting on the driving rods 7 when the movable part 32 vibrates is shared by the two driving rods 7 averagely, and the force acting on the diaphragm 2 by the two driving rods 7 is equal, so that the diaphragm 2 vibrates uniformly. Alternatively, the driving rods 7 are integrally formed with the balance piece 3, which simplifies the processing procedure and the welding precision requirement, and the connection between the driving rods 7 and the movable part 32 is more firm and not easy to fall off.

[0051] In the embodiments of the utility model, please refer to Figure 3 The included angle between the driving rods 7 and the plane of the balance piece 3 is a right angle, and the included angle between the driving rods 7 and the plane where the movable part 32 is located is a right angle, which helps to adjust the connection point of the driving rods 7 and the diaphragm 2 to be close to the center point of the diaphragm 2, so that the diaphragm 2 vibrates more uniformly under the driving of the driving rods 7, and the sound production effect is better. It should be noted that the connection point of the driving rods 7 and the movable part 32 is glued or welded, which strengthens the fixation between the driving rods 7 and the movable part 32, so that the driving rods 7 are not easy to break at the connection point with the movable part 32. In addition, a reinforcing piece is arranged at the connection point of the driving rods 7 and the diaphragm 2, one side of the reinforcing piece is connected with the driving rods 7, and the other side of the reinforcing piece is connected with the diaphragm 2. The reinforcing piece serves to increase the force receiving area of the diaphragm 2, instead of receiving force through one end point of one driving rod 7, so that the diaphragm 2 vibrates more uniformly and effectively when the driving rods 7 vibrate, and the edge of the diaphragm 2 is not easy to deform when vibrating. The shape of the reinforcing piece can be square, circular, any polygon or other irregular shape, etc.

[0052] The utility model further provides a hearing aid, the hearing aid moving iron unit 100, the specific structure of the moving iron unit 100 refers to the above embodiment, because the hearing aid adopts all the technical schemes of the above all embodiments, therefore at least has all the beneficial effects brought by the technical scheme of the above embodiment, here will not repeat again. Among them, the type of the applied hearing aid is not specifically limited, for example can be ear back type hearing aid, ear in type hearing aid or wireless hearing aid, etc., can be designed according to actual demand.

[0053] The above only is the exemplary implementation of the utility model, and does not limit the patent range of the utility model, and any equivalent structure transformation made by the utility model specification and the attached drawing contents or direct / indirect application in other related technical fields under the technical concept of the utility model are included in the patent protection range of the utility model.

Claims

1. A moving iron unit, characterized by The moving iron unit comprises: a shell, an internal cavity is formed; a diaphragm, movably mounted on the shell; a balance piece, provided in the cavity, and one end of the balance piece is drivingly connected with the diaphragm to drive the reciprocating vibration of the diaphragm, the magnetic permeability of the balance piece ranges from 500 to 80000H / m; a permanent magnet, sleeved on the end of the balance piece, and gap-fitted with the balance piece to form a moving space; a coil, sleeved on the outer periphery of the balance piece, and gap-fitted with the balance piece.

2. The moving iron unit of claim 1, wherein, The balance piece has a large value of saturation magnetic induction intensity and is higher than 0.5T.

3. The moving iron unit of claim 2, wherein, The balance piece is made of at least one of amorphous material, nanocrystalline, iron-based amorphous, cobalt-based amorphous, armature and permalloy.

4. The moving iron unit of claim 3, wherein the magnet is a permanent magnet. The balance piece is arranged in a "mountain" shape or a U-shaped structure; and / or The balance piece comprises a fixed part and a movable part connected with each other, the fixed part is fixed in the cavity, and the free end of the movable part is gap-fitted with the permanent magnet and reciprocates in the moving space.

5. The moving iron unit of claim 1, wherein, The moving iron unit further comprises a magnetic shield layer, the magnetic shield layer is provided on the outer periphery of the coil, and the magnetic permeability of the magnetic shield layer ranges from 500 to 80000H / m.

6. The moving iron unit of claim 5, wherein the magnet is a permanent magnet. The magnetic shield layer has a large value of saturation magnetic induction intensity and is higher than 0.5T.

7. The moving iron unit according to any one of claims 1 to 6, wherein The moving iron unit further comprises a driving rod, and two ends of the driving rod are fixedly connected with the diaphragm and the balance piece respectively.

8. The moving iron unit of claim 7, wherein the magnet is a permanent magnet. The driving rod and the balance piece form a right angle.

9. A hearing aid, characterized in that The hearing aid comprises the moving iron unit according to any one of claims 1 to 8.

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