CN106714053B

CN106714053B - Moving-iron type telephone receiver

Info

Publication number: CN106714053B
Application number: CN201611075411.2A
Authority: CN
Inventors: 周凯
Original assignee: Shenzhen Bellsing Acoustic Technology Co Ltd
Current assignee: Shenzhen Bellsing Acoustic Technology Co Ltd
Priority date: 2016-11-29
Filing date: 2016-11-29
Publication date: 2023-01-10
Anticipated expiration: 2036-11-29
Also published as: CN106714053A

Abstract

The invention relates to the technical field of electroacoustic conversion, in particular to a moving-iron type telephone receiver which comprises a shell, a vibrating diaphragm assembly, a coil, an armature and a magnetic yoke, wherein the armature is a U-shaped armature, the U-shaped armature comprises a fixed edge and a vibrating edge, the fixed edge is fixed on the magnetic yoke, a buffer layer is arranged on one side of the coil close to the fixed edge, one surface of the buffer layer is in contact with the fixed edge, and the other surface of the buffer layer is in contact with the coil. The fixed limit of U-shaped armature is fixed with the yoke, is equipped with the buffer layer on the coil is close to one side on fixed limit moreover, and the one side and the fixed limit contact of buffer layer can avoid this part to be in unsettled state, reduce the fixed limit and do the possibility of co-frequency vibration with the vibration limit in certain range, avoid moving iron formula receiver even harmonic distortion increase's probability.

Description

Moving-iron type telephone receiver

Technical Field

The embodiment of the invention relates to the technical field of electroacoustic conversion, in particular to a moving-iron type telephone receiver.

Background

The moving-iron type telephone receiver is mainly applied to wearing equipment such as hearing aids, earphones and monitoring equipment, and has the capability of restoring sound with excellent high-frequency performance.

In the process of implementing the invention, the inventor finds that the following problems exist in the related art: when the moving-iron type receiver adopts the U-shaped armature, one side of the U-shaped armature is fixed with the shell or the magnet assembly, so that the problem of abnormal sound caused by direct contact with the coil when the U-shaped armature vibrates is avoided, and a gap is reserved between the coil and the U-shaped armature. The other side of the U-shaped armature penetrates through the center of the coil and is connected with the conducting rod, because the U-shaped armature is a piece of integral metal, most of the U-shaped armature close to the bent part is also in a suspended state, when the U-shaped armature connected with the conducting rod vibrates at a high frequency, the part of the U-shaped armature close to the bent part can also vibrate at the same frequency within a certain amplitude, and even harmonic distortion of the moving iron unit is increased.

Disclosure of Invention

The invention provides a moving-iron type receiver aiming at the technical problem that even harmonic distortion of a moving-iron unit is increased because one side of a U-shaped armature close to a bent part is vibrated at the same frequency within a certain amplitude by the connecting side of the U-shaped armature and a conducting rod of the moving-iron type receiver in the prior art.

The embodiment of the invention provides a moving-iron type telephone receiver which comprises a shell, a vibrating diaphragm assembly, a coil, an armature and a magnetic yoke, wherein the armature is a U-shaped armature, the U-shaped armature comprises a fixed edge and a vibrating edge, the fixed edge is fixed on the magnetic yoke, a buffer layer is arranged on one side of the coil, which is close to the fixed edge, one surface of the buffer layer is in contact with the fixed edge, and the other surface of the buffer layer is in contact with the coil; the buffer layer extends to the bending part of the U-shaped armature to form a bending layer, and one surface of the bending layer is in contact with the bending part of the U-shaped armature; the buffer layer is damping glue, and the damping glue is kept in a liquid state between-33 ℃ and 116 ℃. The shell comprises an upper shell and a lower shell, the upper shell comprises a top plate and upper side walls extending downwards from two side edges of the top plate, and a third fixing recess and a fourth fixing recess are respectively arranged on the two upper side walls; the lower shell comprises a bottom plate, and further comprises a first lower side wall and a second lower side wall, wherein the first lower side wall and the second lower side wall extend upwards from two sides of the bottom plate; the diaphragm component comprises a support frame and a film, the film is fixed on the support frame, a first extending part and a second extending part respectively extend downwards from two sides of the support frame, a first elastic deformation boss and a first fixed recess are arranged on the outer side of the first extending part, and a second elastic deformation boss and a second fixed recess are arranged on the outer side of the second extending part; the first lower side wall is provided with a first clamping groove with an opening facing inwards, one end of the first elastic deformation piece is fixed at the bottom of the first clamping groove, and the other end of the first elastic deformation piece is fixed with the first fixing ball; the second lower side wall is provided with a second clamping groove with an opening facing inwards, one end of the second elastic deformation piece is fixed at the bottom of the second clamping groove, and the other end of the second elastic deformation piece is fixed with the second fixing ball; the first fixing ball is at least partially embedded into the first fixing recess, and the first elastic deformation boss extends into the third fixing recess; the second fixing ball is at least partially embedded into the second fixing recess, and the second elastic deformation boss extends into the fourth fixing recess.

Optionally, the surface roughness of the bottom surface of the coil ranges from 3.721 to 9.794 μm.

Optionally, the bottom surface of the coil is provided with a plurality of first blind holes or a plurality of first zigzag protrusions.

Optionally, the bottom surface of the coil is provided with a plurality of first recesses arranged in a fermat spiral or first grooves arranged in an archimedean spiral.

Optionally, the coil is formed by winding a conducting wire for multiple turns, an insulating layer wraps the outer side of the conducting wire, and the surface roughness of the outer side surface of the insulating layer is 2.812-5.626 μm.

Optionally, a plurality of second blind holes or a plurality of zigzag second protrusions are disposed on the outer side surface of the insulating layer.

Optionally, the top of the first lower sidewall is provided with the first fixing groove, the sidewall of the first fixing groove is provided with the first clamping groove, the first clamping groove is communicated with the first fixing groove, and the first extending portion is accommodated in the first fixing groove;

the top of the second lower side wall is provided with the second fixing groove, the side wall of the second fixing groove is provided with the second clamping groove, the second clamping groove is communicated with the second fixing groove, and the second extending part is contained in the second fixing groove.

The implementation mode of the invention has the beneficial effects that: different from the situation of the prior art, the moving-iron receiver comprises a shell, a vibrating diaphragm assembly, a coil, an armature and a magnetic yoke, wherein the armature is a U-shaped armature, the U-shaped armature comprises a fixed edge and a vibrating edge, the fixed edge is fixed on the magnetic yoke and the coil, a buffer layer is arranged on one side of the coil close to the fixed edge, one side of the buffer layer is in contact with the fixed edge, and the other side of the buffer layer is in contact with the coil. The moving-iron type receiver adopts the U-shaped armature, the fixed edge of the U-shaped armature is fixed on the magnetic yoke, the buffer layer is arranged on one side of the coil close to the fixed edge, one surface of the buffer layer is in contact with the fixed edge, the part can be prevented from being in a suspended state, the possibility that the fixed edge and the vibrating edge vibrate at the same frequency within a certain amplitude is reduced, and the probability of increasing the even harmonic distortion of the moving-iron type receiver is avoided; and the fixed edge is contacted with the coil through the buffer layer, is not in rigid contact, and is not easy to generate abnormal sound.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings which correspond to and are not to be construed as limiting the embodiments, in which elements having the same reference numeral designations represent like elements throughout, and in which the drawings are not to be construed as limiting in scale unless otherwise specified.

Fig. 1 is a schematic structural diagram of a moving-iron receiver according to an embodiment of the present invention;

fig. 2 is a schematic partial structural view of a moving-iron receiver according to another embodiment of the present invention;

fig. 3 is a schematic partial structural view of a moving-iron receiver according to another embodiment of the present invention;

fig. 4 is a schematic partial structural view of a moving-iron receiver according to another embodiment of the present invention;

fig. 5 is a schematic partial structural view of a moving-iron receiver according to another embodiment of the present invention;

fig. 6 is a schematic partial structural view of a moving-iron receiver according to another embodiment of the present invention;

fig. 7 is a schematic partial structural view of a moving-iron receiver according to another embodiment of the present invention;

fig. 8 is a schematic partial structural view of a moving-iron receiver according to another embodiment of the present invention;

fig. 9 is a schematic structural diagram of a moving-iron receiver according to another embodiment of the present invention.

Detailed Description

In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are illustrative of some, but not all embodiments of the invention. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are merely intended to facilitate the description of the present invention and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the scope of the present invention.

In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in fig. 1, the moving-iron receiver 300 according to the embodiment of the present invention includes a housing, a diaphragm assembly, a coil 40, an armature, and a yoke 50, where the armature is a U-shaped armature 60, the U-shaped armature 60 includes a fixed edge 61 and a vibrating edge 62, the fixed edge 61 is located above the yoke 50 and the coil 40, the fixed edge 61 is fixed on the yoke 50, a buffer layer 70 is disposed on a side of the coil 40 close to the fixed edge 61, one surface of the buffer layer 70 contacts the fixed edge 61, and the other surface of the buffer layer 70 contacts the coil 40.

The implementation mode of the invention has the beneficial effects that: different from the situation of the prior art, the moving-iron receiver 300 of the embodiment of the present invention adopts the U-shaped armature 60, the yoke bottom surface 611 of the fixed edge 61 of the U-shaped armature 60 is fixed with the yoke 50, and the buffer layer 70 is disposed on the side of the coil 40 close to the fixed edge 61, and one surface of the buffer layer 70 contacts with the fixed edge 61 of the fixed edge 61, so as to prevent the armature of this part from being in a suspended state, reduce the possibility that the fixed edge 61 and the vibrating edge 62 vibrate at the same frequency within a certain range, and avoid the probability that the even harmonic distortion of the moving-iron receiver 300 increases; further, the fixed edge 61 is not in rigid contact with the coil 40 through the buffer layer 70, and thus the noise problem is not easily generated.

In some embodiments, a buffer layer 70 may be further disposed on the surface of the fixing edge 61 facing away from the magnetic yoke 50, so as to avoid rigid contact between the U-shaped armature 60 and the contact portion of other components, for example, rigid contact between the U-shaped armature 60 and the housing, or rigid contact between the U-shaped armature 60 and the diaphragm assembly, and avoid the problem of sound distortion caused thereby.

In another embodiment, as shown in fig. 8, the buffer layer 70 has a folded layer 71 extending in the direction of the folded portion of the U-shaped armature 60, and one surface of the folded layer 71 is in contact with the folded portion of the U-shaped armature 60. The bending layer 71 extending from the buffer layer 70 toward the bending portion of the U-shaped armature 60 can further reduce the possibility that the fixed edge 61 vibrates with the same frequency as the vibrating edge 62 within a certain range, thereby avoiding the increase of even harmonic distortion of the moving-iron receiver 300. The vibration of the vibrating edge 62 is transmitted to the bent portion of the U-shaped armature 60, and the bent layer 71 in contact with the bent portion buffers the vibration, and then the vibration of the vibrating edge 62 is transmitted to the fixed edge 61 and buffered by the buffer layer 70.

In another embodiment, the buffer layer is damping glue, the curing point of the damping glue ranges from-33 ℃ to-44 ℃, and the liquefaction point ranges from 104 ℃ to 116 ℃. That is, preferably, the damping paste is kept in a liquid state between-33 ℃ and 116 ℃, and the viscosity characteristic and the fluidity of the damping paste are kept unchanged, and the viscosity characteristic and the fluidity of the damping paste are not changed with the change of time at the temperature between-33 ℃ and 116 ℃. The damping rubber plays a role in damping and buffering, and can greatly reduce the vibration amplitude of the fixed edge 61 of the U-shaped armature 60, so that even harmonic distortion generated by the vibration amplitude is improved. The damping glue of the embodiment of the invention does not use solid glue or common liquid glue, because if the glue is solidified, the glue can be separated from the armature when the armature vibrates at high frequency, so that the armature collides with the solid glue, and more serious abnormal sound and distortion problems can be caused; the reason why the common liquid glue is not adopted is that the fluidity is larger and the damping effect is small.

As shown in fig. 1, one side of the bottom surface of the fixing side 61 is a yoke bottom surface 611, the yoke bottom surface 611 is fixed to the yoke 50, the other side of the bottom surface of the fixing side 61 is a coil bottom surface 613, and the coil bottom surface 613 is in contact with the buffer layer 70.

In order to increase the frictional force between the coil bottom surface 613 and the buffer layer 70, the surface roughness of the coil bottom surface 613 is set to be in the range of 3.721 to 9.794 μm, and the evaluation length lr thereof is 0.8mm, and a value of less than 5 × lr may be selected for measurement because of the good surface uniformity of the armature.

Specifically, in order to increase the friction between the bottom surface 613 of the coil and the buffer layer 70 and make the bottom surface 613 of the coil have a certain surface roughness, as shown in fig. 2, a plurality of first blind holes 6131 are disposed on the bottom surface 613 of the coil. The damping paste rises to the bottom of the first blind hole 6131 under the capillary action, and the contact surface between the coil bottom surface 613 and the buffer layer 70 is enlarged, so that the friction force between the coil bottom surface 613 and the buffer layer 70 is increased.

Further, in order to increase the friction between the coil bottom surface 613 and the buffer layer 70 and make the coil bottom surface 613 have a certain surface roughness, as shown in fig. 3, a plurality of saw-tooth-shaped first protrusions 6132 are disposed on the coil bottom surface 613. The damping paste rises to the gap between the first protrusions 6132 under the capillary action, and the contact surface between the coil bottom surface 613 and the buffer layer 70 is enlarged, so that the friction between the coil bottom surface 613 and the buffer layer 70 is increased.

Preferably, in order to further increase the friction between the coil bottom surface 613 and the buffer layer 70 and to make the coil bottom surface 613 have a certain surface roughness, a plurality of first recesses 6135 arranged in a fermat spiral as shown in fig. 4 are provided in the coil bottom surface 613. The fermat spiral is one of equiangular spirals. The fermat spiral is a kind of plane spiral, and starts to wind outward from a fixed point and forms a curve, and the fermat spiral is a kind of equiangular spiral, and the expression is as follows:

r ² ＝a2θ

where a is a real number. Where r is the radius of the circle and θ is the polar angle.

The damping rubber rises to the bottom of the first recesses 6135 arranged in a fermat spiral under capillary action, increasing the contact surface between the bottom 613 of the coil and the buffer layer 70, and increasing the friction between the bottom 613 of the coil and the buffer layer 70. The friction distribution of the first recesses 6135 arranged in a fermat spiral is more uniform, which can further increase the friction between the coil bottom 613 and the buffer layer 70.

Or the first grooves 6136 arranged according to an archimedes spiral as shown in fig. 5 are provided on the coil bottom surface 613. Archimedes spiral (also known as isovelocity spiral), known as archimedes by the third century greece mathematician in the metric era. An archimedean spiral is a trajectory produced by a point rotating around a fixed point at a constant angular velocity while leaving the fixed point at a constant velocity.

The polar equation for an archimedean spiral is:

r＝a+bθ

where a and b are both real numbers. The variation parameter a corresponds to the rotational spiral, while the parameter b controls the distance between two adjacent curves.

The planar cartesian coordinate equation for an archimedean spiral is:

x＝(α+βθ)cos(θ)

y＝(α+βθ)sin(θ)

the general method for transforming from cartesian to polar coordinates:

the general transformation method from a polar coordinate system to a cartesian coordinate system:

x＝rcos(θ)

y＝rsin(θ)

the damping rubber rises to the bottom of the first groove 6136 arranged according to the archimedean spiral line under the capillary action, and the contact surface between the coil bottom surface 613 and the buffer layer 70 is enlarged, so that the friction force between the coil bottom surface 613 and the buffer layer 70 is increased. The first grooves 6136 arranged according to the archimedean spiral line make the friction distribution more uniform, and can further increase the friction between the coil bottom surface 613 and the buffer layer 70.

In another embodiment, the coil 40 is formed by winding a wire (not shown) in multiple turns, the wire is covered with an insulating layer, the outer side surface 42 of the insulating layer has a surface roughness of 2.812-5.626 μm and an evaluation length lr of 0.8mm, since the insulating layer is generally composed of a plastic insulating material and a rubber insulating material, the outer side surface of the insulating layer is made of plastic, the surface uniformity of the plastic is good, and the evaluation length value smaller than 5 × lr can be selected during measurement.

Specifically, in order to increase the friction between the outer side surface 42 of the insulating layer of the coil 40 and the buffer layer 70 and to make the outer side surface 42 of the insulating layer of the coil 40 have a certain surface roughness, as shown in fig. 6, a plurality of second blind holes 421 are provided on the outer side surface 42 of the insulating layer of the coil 40. The damping glue descends to the bottom of the second blind hole 421 under the capillary action, and the contact surface between the outer side surface 42 of the insulating layer of the coil 40 and the buffer layer 70 is enlarged, so that the friction force between the outer side surface 42 of the insulating layer of the coil 40 and the buffer layer 70 is increased.

Or a plurality of second protrusions 423 having a saw-tooth shape are formed on the outer surface 42 of the insulation layer of the coil 40 as shown in fig. 7 in order to increase the frictional force between the outer surface 42 of the insulation layer of the coil 40 and the buffer layer 70 and to make the outer surface 42 of the insulation layer of the coil 40 have a certain surface roughness. The damping paste descends to the gap between the second protrusions 423 under the capillary action, and the contact surface between the outer side surface 42 of the insulating layer of the coil 40 and the buffer layer 70 is enlarged, so that the friction force between the outer side surface 42 of the insulating layer of the coil 40 and the buffer layer 70 is increased.

In yet another embodiment, as shown in fig. 9, the diaphragm assembly includes a support frame 109 and a membrane 105, the support frame 109 is provided with a first opening, and the membrane 105 is fixed on the support frame 109 and covers the first opening.

Further, the lower shell 120 includes a bottom plate 122, and a first lower sidewall 123 and a second lower sidewall 121 extending upward from both sides of the bottom plate 122, and the shell further includes a first fixing groove 87, a first catching groove 86, a first fixing ball 81, and a first elastic deformation member 82 disposed on the first lower sidewall 123; the second lower sidewall 121 is provided with a second fixing groove 88, a second catching groove 88, a second fixing ball 83 and a second elastic deformation member 84, the lower case 120 includes a bottom plate and a lower sidewall extending upward from an edge of the bottom plate, and the upper case 110 includes a top plate and an upper sidewall extending downward from both side edges of the top plate.

The top of the lower sidewall is provided with a first fixing groove 87 and a second fixing groove 89, i.e., the first fixing groove 87 is provided at the top of the first lower sidewall 123 and the second fixing groove 89 is provided at the top of the second lower sidewall 121. The first lower side wall 123 is provided with a first clamping groove 86 with an inward opening, or the first fixing groove 87 is provided with a first clamping groove 86 near the outer side wall, the first clamping groove 86 is communicated with the first fixing groove 87, one end of the first elastic deformation member 82 is fixed to the bottom of the first clamping groove 86, the other end of the first elastic deformation member is fixed to the first fixing ball 81, and when the first elastic deformation member 82 is in a natural telescopic state, the first fixing ball 81 at least partially protrudes out of the first clamping groove 86 and is embedded into the first fixing groove 87. Set up the opening on the lateral wall 121 down towards the second joint groove 88 of inboard, perhaps be provided with second joint groove 88 near the lateral wall in the outside at second fixed slot 89, second joint groove 88 and second fixed slot 89 intercommunication, the one end of second elastic deformation piece 84 is fixed in the bottom in second joint groove 88, and the other end is fixed with second fixed ball 83, when second elastic deformation piece 84 is in the state of stretching out and drawing back naturally, second fixed ball 83 is at least partly protrusion in second joint groove 88 and embedding second fixed slot 89.

The outer walls of the two sides of the support frame 109 are respectively extended with a first extending portion 97 and a second extending portion 99, the first extending portion 97 is provided with a first fixing recess 91, when the first extending portion 97 is accommodated in the first fixing groove 87, the first fixing ball 81 is at least partially embedded in the first fixing recess 91, the second extending portion 99 is provided with a second fixing recess 93, when the second extending portion 99 is accommodated in the second fixing groove 89, the second fixing ball 83 is at least partially embedded in the second fixing recess 93, so that the diaphragm and the lower shell 120 are fixed. In the present embodiment, both the first and second elastically

deformable members

82 and 84 are springs. By utilizing the elastic deformation property of the elastic deformation member, when the first extension portion 97 is inserted into the first fixing groove 87 and the second extension portion 99 is inserted into the second fixing groove 89, the first extension portion 97 pushes the first fixing ball 81 to retract into the first catching groove 86, and the second extension portion 99 pushes the second fixing ball 83 to retract into the second catching groove 88, until when the first fixing recess 91 slides to a position corresponding to the first fixing ball 81 and the second fixing recess 93 slides to a position corresponding to the second fixing ball 83, the first fixing ball 81 is pushed by the first elastic deformation member 82 to be partially embedded into the first fixing recess 91, and the second fixing ball 83 is pushed by the second elastic deformation member 84 to be partially embedded into the second fixing recess 93, thereby fixing the diaphragm and the lower shell 120. In addition, the diaphragm and the upper case 110 can be easily detached by using the elastic deformation performance of the elastic deformation member.

Further, the outer wall of the support frame 109 is further provided with a first elastic deformation boss 103 and a second elastic deformation boss 101, the first elastic deformation boss 103 is located below the first extension portion 103, and the second elastic deformation boss 101 is located below the second extension portion 101. The last lateral wall of epitheca 110 both sides still is provided with third fixed sunken 113 and fourth fixed sunken 111 respectively, first elastic deformation boss 103 stretches into third fixed sunken 113, first elastic deformation boss 103 is fixed with the unsmooth cooperation of third fixed sunken 113, second elastic deformation boss 101 stretches into fourth fixed sunken 111, second elastic deformation boss 101 is fixed with the unsmooth cooperation of fourth fixed sunken 111, it is fixed with epitheca 110 to make support frame 109, thereby make epitheca 110, inferior valve 120 and support frame 109 three fixed mutually, and epitheca 110, can dismantle fixedly between inferior valve 120 and the support frame 109 three, make things convenient for epitheca 110, dismantle and install between inferior valve 120 and the support frame 109.

It should be noted that: in order to better fix the holder frame 109 and the lower case 120, the first fixing groove 87 and the second fixing groove 89 may be oppositely disposed, for example: when the lower case 120 has a square shape, the first and second fixing

grooves

87 and 89 are respectively positioned at the tops of the two opposite lower sidewalls.

Of course, the first extension 97 and the second extension 99 may be oppositely disposed, for example: when the support frame 109 is square, the first extension portion 97 and the second extension portion 99 are respectively disposed on two opposite sidewalls of the support frame 109.

Furthermore, sealing gaskets are further arranged between the lower casing 120 and the support frame 109 and between the upper casing 110 and the support frame 109, so that when the moving-iron type telephone receiver 300 produces sound, air flow is prevented from flowing out from gaps between the lower casing 120 and the support frame 109 and/or gaps between the upper casing 110 and the support frame 109, and the performance of the moving-iron type telephone receiver 300 is prevented from being affected.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A moving-iron type telephone receiver comprises a shell, a vibrating diaphragm assembly, a coil, an armature and a magnetic yoke, and is characterized in that the armature is a U-shaped armature, the U-shaped armature comprises a fixed edge and a vibrating edge, the fixed edge is fixed on the magnetic yoke, a buffer layer is arranged on one side of the coil close to the fixed edge, one surface of the buffer layer is in contact with the fixed edge, and the other surface of the buffer layer is in contact with the coil;

the buffer layer extends to the bending part of the U-shaped armature to form a bending layer, and one surface of the bending layer is in contact with the bending part of the U-shaped armature;

the buffer layer is damping glue, and the damping glue is kept in a liquid state at a temperature of between 33 ℃ below zero and 116 ℃;

the shell comprises an upper shell and a lower shell, the upper shell comprises a top plate and upper side walls extending downwards from two side edges of the top plate, and a third fixing recess and a fourth fixing recess are respectively arranged on the two upper side walls;

the lower shell comprises a bottom plate, and further comprises a first lower side wall and a second lower side wall, wherein the first lower side wall and the second lower side wall extend upwards from two sides of the bottom plate;

the diaphragm component comprises a support frame and a film, the film is fixed on the support frame, a first extending part and a second extending part respectively extend downwards from two sides of the support frame, a first elastic deformation boss and a first fixed recess are arranged on the outer side of the first extending part, and a second elastic deformation boss and a second fixed recess are arranged on the outer side of the second extending part;

the first lower side wall is provided with a first clamping groove with an opening facing inwards, one end of the first elastic deformation piece is fixed at the bottom of the first clamping groove, and the other end of the first elastic deformation piece is fixed with the first fixing ball;

the second lower side wall is provided with a second clamping groove with an opening facing inwards, one end of the second elastic deformation piece is fixed at the bottom of the second clamping groove, and the other end of the second elastic deformation piece is fixed with the second fixing ball;

the first fixing ball is at least partially embedded into the first fixing recess, and the first elastic deformation boss extends into the third fixing recess;

the second fixing ball is at least partially embedded into the second fixing recess, and the second elastic deformation boss extends into the fourth fixing recess.

2. The moving-iron receiver according to claim 1, wherein the surface roughness of the bottom surface of the coil is in the range of 3.721 to 9.794 μm.

3. The moving-iron receiver according to claim 2, wherein the bottom surface of the coil is provided with a plurality of first blind holes or a plurality of first saw-tooth protrusions.

4. The moving-iron receiver according to claim 3, wherein the bottom surface of said coil is provided with a plurality of first recesses arranged in a Fermat spiral or first grooves arranged in an Archimedes spiral.

5. The moving-iron receiver according to claim 1, wherein the coil is formed by winding a wire into a plurality of turns, the outside of the wire is wrapped by an insulating layer, and the surface roughness of the outer side surface of the insulating layer is 2.812-5.626 μm.

6. The moving-iron receiver according to claim 5, wherein the outer side of the insulating layer is provided with a plurality of second blind holes or a plurality of second saw-tooth-shaped protrusions.

7. The moving-iron receiver as claimed in claim 1, wherein a first fixing groove is formed on a top of the first lower sidewall, the first engaging groove is formed on a sidewall of the first fixing groove, the first engaging groove is connected to the first fixing groove, and the first extending portion is received in the first fixing groove;

the top of the second lower side wall is provided with a second fixing groove, the side wall of the second fixing groove is provided with a second clamping groove, the second clamping groove is communicated with the second fixing groove, and the second extending portion is contained in the second fixing groove.