WO2023005268A1

WO2023005268A1 - Balanced armature driver, balanced armature driver assembly method, and receiver

Info

Publication number: WO2023005268A1
Application number: PCT/CN2022/087533
Authority: WO
Inventors: 贾少伟; 刘建军; 廖兵; 董杰; 刘洋
Original assignee: 深圳市长盈精密技术股份有限公司
Priority date: 2021-07-28
Filing date: 2022-04-19
Publication date: 2023-02-02

Abstract

A balanced armature driver, comprising a housing that is internally provided with a cavity, a diaphragm that divides the cavity into an upper cavity and a lower cavity, and a motor assembly that is fixed in the lower cavity. The housing comprises a lower housing, a middle frame and an upper housing. The diaphragm is clamped between the middle frame and the upper housing and divides the cavity into the upper cavity and the lower cavity. The motor assembly is fixed in the lower housing, the middle frame is sleeved outside of the motor assembly and is joined and fixed to the lower housing, and the motor assembly drives the diaphragm to vibrate up and down. In the balanced armature driver of the present application, the structure of a portion of the components is simplified, allowing the structural design to more easily achieve automatic assembly of the components, and manpower use is reduced.

Description

Moving iron unit, moving iron unit assembly method and receiver

technical field

The present application relates to the field of audio communication, in particular to a moving iron unit, a method for assembling the moving iron unit, and a receiver.

Background technique

True wireless earphones are more and more used in people's daily life, effectively getting rid of the restrictions and inconvenience of wired earphones, and the industrial scale is rapidly expanding. The moving iron unit is an electro-acoustic conversion unit used in earphones and hearing aids. It is used to convert electrical signals into sound signals. However, the size of the moving iron unit is extremely small, and product assembly is extremely difficult. It must be assembled in an automated way. test. Patent application No. 201721263601.7 of the People's Republic of China discloses a moving iron receiver, which includes a metal casing, a motor assembly assembled in the metal casing, a diaphragm that divides the metal casing into a front cavity and a rear cavity, and connects the motor The reed of the component and the connection pin of the diaphragm. The metal shell is divided into upper and lower parts, including an upper shell and a lower shell. The diaphragm is clamped between the upper shell and the lower shell and fixed by dispensing or welding. When assembling, the lower shell The depth is relatively deep, which is not convenient for automatic assembly and welding of the motor assembly. The metal shell is sealed by dispensing glue, which has the problem of poor sealing, which leads to sound leakage and affects the sound quality effect. The diaphragm includes a bracket, flapping wings and a membrane, and the flap is connected to the bracket by thermoforming the membrane. The thermoforming scheme of this process is complicated and the yield rate is low. The motor assembly includes a "back"-shaped iron core, a pair of magnets placed on the upper and lower sides of the iron core, a coil bonded to one longitudinal end of the iron core, and at least partially passing through the coil and a pair of the The reeds between the magnets, the magnets need to be bonded inside the iron core, and the assembly cannot be automated, or the glue cannot stably fix the magnets in the iron core, and it is easy to loosen and cause quality problems question.

Contents of the invention

In view of this, it is necessary to provide a moving iron unit, a method for assembling the moving iron unit, and a receiver that are simple in structure and easy to realize large-scale automatic production.

In order to solve the above technical problems, the application provides a moving iron unit, which includes a housing with a cavity inside, a diaphragm that divides the cavity into an upper cavity and a lower cavity, and a motor fixed in the lower cavity Assemblies, the shell includes a lower shell, a middle frame and an upper shell, the diaphragm separates the cavity into an upper cavity and a lower cavity, the motor assembly is fixed in the lower shell, and the middle frame is sleeved The motor assembly is outside the motor assembly and connected with the lower case, and the motor assembly drives the diaphragm to vibrate up and down.

In order to solve the above technical problems, the application provides a method for assembling a moving iron unit, including the following steps:

S201. Provide a casing and a motor assembly, the casing includes a lower casing, a middle frame, and an upper casing, and fix the motor assembly in the lower casing;

S202. Put the middle frame into the motor assembly and fit and fix it with the lower case; weld a connecting rod on the motor assembly;

S203. Provide a diaphragm, the diaphragm includes a bracket, vibrating wings, and a film thermoformed on the bracket and the vibrating wings, and cover and fix the bracket of the diaphragm on the upper side of the middle frame;

S204. The motor assembly includes a magnetic unit, a coil, and a reed, and the other end of the connecting rod is fixed on the vibrating wing so that the reed and the vibrating wing are linked;

S205. Cover the upper shell on the upper side of the diaphragm and fix it with the bracket; the diaphragm divides the shell into an upper cavity and a lower cavity, and the upper cavity passes through the diaphragm and the upper shell The lower cavity is formed by surrounding the lower shell, the middle frame and the flapping wings;

S206, providing a weldment, the first longitudinal end of the lower case is provided with a lead wire outlet, the second longitudinal end of the upper case is provided with a sound outlet, the motor assembly includes a coil provided with a lead wire, and the lead wire extends to the At the outlet of the lead wire, the soldering piece includes a solder piece fixed at the longitudinal first end of the housing and solder for welding the lead wire to the solder piece.

In order to solve the above technical problems, the present application also provides a receiver, including the aforementioned moving iron unit.

The moving iron unit of this application greatly reduces the depth of the lower case by dividing the outer case into independent lower case, middle frame and upper case, thereby reducing the difficulty of automatically assembling the motor assembly in the lower case , at the same time taking into account the convenience of automatic dispensing of the connecting rod to fix the connecting rod in the connecting hole and the through hole after the diaphragm is assembled. This design scheme greatly improves the automation capability, greatly improves the product assembly efficiency and reduces the manufacturing cost.

Description of drawings

The drawings described here are used to provide a further understanding of the application and constitute a part of the application. The schematic embodiments and descriptions of the application are used to explain the application and do not constitute an improper limitation to the application. In the attached picture:

Fig. 1 is the three-dimensional assembly diagram of the moving iron unit of the present application;

Fig. 2 is a partial three-dimensional exploded view of the moving iron unit of the present application;

Figure 3 is a complete three-dimensional exploded view of the moving iron unit of the present application;

Fig. 4 is the perspective view of the diaphragm of the moving iron unit of the present application;

Fig. 5 is a three-dimensional exploded view of the diaphragm of the moving iron unit of the present application;

Fig. 6 is a sectional view along the broken line B-B shown in Fig. 5;

7 is a three-dimensional combined view of the motor assembly of the moving iron unit of the present application;

Fig. 8 is a sectional view along the dashed line C-C shown in Fig. 7;

Fig. 9 is a sectional view along the dashed line A-A shown in Fig. 1 .

Detailed ways

In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with specific embodiments of the present application and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments.

In this application, the X direction shown in FIG. 1 is taken as the longitudinal direction, the Y direction is taken as the transverse direction, and the Z direction is taken as the vertical direction.

Please continue to refer to FIG. 1 to FIG. 3, as shown in FIG. 9, the moving iron unit of the present application includes a housing 10, a diaphragm 20 that separates the housing 10 into an upper chamber S1 and a lower chamber S2, and is assembled on the lower chamber of the housing 10. The motor assembly 30 in the chamber S2 and the weldment 40 disposed at one longitudinal end of the housing 10 .

The casing 10 includes a middle frame 11, an upper casing 13 and a lower casing 12 respectively located on the upper and lower sides of the middle frame 11, the diaphragm 20 is clamped between the middle frame 11 and the upper casing 13, The diaphragm 20 and the upper shell 13 define the upper chamber S1. The diaphragm 20 is surrounded by the middle frame 11 and the lower case 12 to form the lower cavity S2.

The middle frame 11 includes a frame body 111 and a cavity 112 penetrating up and down and surrounded by the frame body 11 . The frame body 111 includes an upper surface 113 and a lower surface 114 . The frame body 111 is roughly in the shape of a rectangular parallelepiped.

The lower shell 12 includes a lower shell 121 , a lower shell sidewall 122 bent upward from the outer periphery of the lower shell 121 , and a lead wire outlet 123 defined at a first longitudinal end of the lower shell 12 . The upper surface of the lower shell side wall 122 is in contact with the lower surface 114 of the middle frame 11 and fixed together by welding on the outer periphery.

The upper shell 13 includes an upper shell 131 , an upper shell side wall 132 bent downward from the outer periphery of the upper shell 131 , and a sound outlet 133 defined at the second longitudinal end of the upper shell 13 . The upper shell side wall 132 and the upper surface 113 of the middle frame 11 clamp the diaphragm 20 and are welded and fixed together from the outer periphery.

Please continue to refer to FIG. 3 to FIG. 6, the diaphragm 20 includes a bracket 21, a vibrating wing 22 integrally connected with the bracket 21, and a film 23 formed on the bracket 21 and the flapping wing 22 by thermocompression . The bracket 21 includes a longitudinal side bracket body 211 and a lateral side bracket body 212 . The vibrating wing 22 includes a wing body 221, a rib 222 punched upward from the wing body 221, a connecting hole 223 penetrating up and down through the first longitudinal end of the wing body 221, and a second longitudinal end of the wing body 221 up and down. The opening 224 at the end. The bracket 21 and the vibrating wing 22 are formed by one stamping of a metal plate, and the longitudinal second end of the vibrating wing 22 is connected as a whole with the longitudinal side bracket body 211 of the bracket 21 through the connecting part 24 . The connecting portion 24 is preferably a pair, and a cutting hole 25 is formed between the pair of connecting portions 24, and a gap 26 is formed between the flapping wing 22 and the bracket 21 except the connecting portion 24, The flapping wings 22 can vibrate up and down depending on the connecting portion 24 , and the width of the connecting portion 24 should not be too wide so that it has a certain degree of elasticity. The cutting hole 25 may be present as part of the recess 26 . The connecting portion 24 is connected to the vertical side support body 211 and is close to the position of the lateral side support body 212.

The size of the flapping wing 22 is very small, so it is preferable to adopt a design scheme of a pair of connecting parts 24 so as not to fall off during vibration. Of course, in an embodiment, the connecting portion 24 can also be a single design, at this time, the connecting portion 24 needs to have a certain width, and the gap 26 and the cutting hole 25 are connected as one .

The flapping wing 22 can also be connected as a whole with the lateral support body 212 of the support 21 through the connecting portion 24. This embodiment is not a preferred solution because it does not follow the direction of the connecting portion 24 on the elastic fulcrum. direction of extension, resulting in easy breakage. The function of the ribs 224 is to maintain the consistency of the vibrating wing 22 when it vibrates up and down, even when the vibrating wing 22 vibrates up and down, both lateral sides maintain a consistent flatness vibration to avoid uneven vibration. The expression form of the rib 222 can be a whole, and the area is larger than half of the area of the flap 22, or the rib 222 exists in multiple forms to ensure the consistency of the vibration of the flap 22 as a principle.

The membrane 23 includes a wing body 231 thermoformed and bonded on the lower surface of the flap 22 and the bracket 21 , a runway 232 pressed upward from the wing body 231 into the space 26 , and a running track 232 formed from the wing body 231 The rib adhering portion 233 on the lower surface of the rib 222 is attached upward. The wing body 231 is pierced with a through hole 234 corresponding to the connecting hole 223 of the flapping wing 22 , and the wing body 231 is formed through a hole 234 corresponding to the opening 224 of the flapping wing 22 to communicate with the upper chamber S1 and the lower cavity. Flow hole 235 of chamber S2. The inner diameter of the through hole 234 is consistent with the inner diameter of the connecting hole 223 , and the pitch of the flow holes 235 is much smaller than the pitch of the openings 224 . The lower side of the cutting hole 25 between the flapping wing 22 and the bracket 21 is adhered and sealed by the film 23 . The top of the runway 232 protrudes from the bracket 21 to a certain distance from the upper surface of the flap 22 so that the flap 22 is connected by the membrane 23 when vibrating up and down and provides a vibration stroke.

The bracket 21 and the vibrating wing 22 of the conventional diaphragm 20 are of a split structure. When the membrane 23 is hot-pressed, the membrane 23 is hot-pressed on the bracket 21 and then the The vibrating wing 22 is attached to the upper side of the film 23 and overlaps with the bracket 21 at one end in the longitudinal direction. The manufacturing process is complicated and the defective rate is high.

During the manufacturing process of the diaphragm 20 of the present application, several brackets 21 and vibrating wings 22 are punched and formed into several brackets 21 and vibrating wings 22 connected by strips. At this time, there is no need to cut the brackets, and the The film 23 is thermally formed on the support 21 and the flapping wing 22 connected together by several material strips at one time, and then the film 23 outside the support 21 is cut off by laser cutting, and the holes are perforated by laser or hot needle The through hole 234 and the flow hole 235 are formed in a manner, and the diaphragm 20 is manufactured by removing the cut film 23 .

The vibration film 20 of the present application stamps the support 21 and the vibrating wing 22 integrally, and forms a gap 26 between the support 21 and the vibrating wing 22 for the film 23 to form a runway 232 , and the The connecting part 24 connects the vibrating wing 22 to the bracket 21 and provides a certain holding force. The structure of the vibrating wing in this application is simple, and the stamping process and thermoforming process are simplified, which can effectively improve the yield and reduce the manufacturing cost. .

Please continue to refer to FIG. 2, FIG. 3, and FIG. The unit 31 and the reed 33 inside the coil 32 and the connecting rod 34 connecting the reed 33 and the diaphragm 20 .

The magnetic unit 31 includes an iron core with a receiving space 3113 penetrating longitudinally, and a first magnet 313 and a second magnet 314 respectively bonded to the upper and lower sides of the receiving space 3113 . A cavity 315 is formed between the first magnet 313 and the second magnet 314, the first magnet 313 and the second magnet 314 are in a plate-like structure and face each other at a distance from the cavity 315, so Both the first magnet 313 and the second magnet 314 are surrounded by the iron core. The iron core includes a first iron core 311 and a second iron core 312 , and the accommodation space 3113 is formed by the first iron core 311 and the second iron core 312 .

The first iron core 311 includes a bottom wall 3111 and vertical walls 3112 extending upward from both lateral sides of the bottom wall 3111. The first iron core 311 is substantially in a U-shaped structure, the bottom wall 3111 includes an inner surface 3115 of the bottom wall bonded with the second magnet 314, and the vertical wall 3112 includes a surface 3115 bonded with the second iron core. 312 the vertical wall top surface 3114 that fits and is welded together. The second iron core 312 has a plate-like structure, and its width is larger than that of the first magnet 313. The second iron core 312 includes a top wall 3121, and the top wall 3121 includes The inner surfaces 3122 of the top walls come together. The transverse widths of the first magnet 313 and the second magnet 314 are smaller than the transverse width of the receiving space 3113 .

The coil 32 includes a coil body 321 , a coil hole 322 extending longitudinally and corresponding to the cavity 315 , and a pair of lead wires 323 . The structure of the coil 32 is a known technology, and will not be repeated here.

The reed 33 has a U-shaped structure, and the reed 33 includes a fixed part 331, a tightening part 332 formed by reversely bending from one longitudinal end of the fixed part 331, and a tension part 332 formed by horizontally extending from the tightening part 332. The vibrating part 333 located below the fixing part 331 and the extension part 334 extending forward from the vibrating part 333 are formed. The fixing part 331 is fixed on the upper surface of the iron core by laser welding, that is, the free end side of the fixing part 331 is attached to the upper surface of the second iron core 312 and at the joint The sides of the fixed part 331 are fixed together by welding, the side of the fixed part 331 close to the tension part 332 is suspended above the coil 32, and the vibrating part 333 enters the first magnet 313 and the first magnet 313 from the coil hole 322. The cavity 315 between the second magnets 314 is in a suspended state. The extension part 334 extends out of the magnetic unit 31 and is located below the connection hole 223 and the through hole 234 of the diaphragm 20 , one end of the connecting rod 34 is welded to the surface of the extension part 334 , and the connecting rod 34 The other end passes through the connection hole 223 and the through hole 234 and at least partly enters the upper chamber S1, and glue is dispensed in the connection hole 223 and the through hole 234 to fix one end of the connecting rod 34 on the on the diaphragm 20 .

The assembly method of the motor assembly 30 includes the following steps:

S101, bonding the first magnet 313 and the second magnet 314 to the second iron core 312 and the first iron core 311 respectively and curing;

In this step, glue is applied to the surfaces of the first magnet 313 and the second magnet 314, and then the first magnet 313 is adhered to the inner surface 3122 of the top wall of the second iron core 312, The second magnet 314 is adhered to the inner surface 3115 of the bottom wall of the first iron core 311; then, curing is carried out, and the curing can be carried out by means of light or the like. This step can be accomplished using an automated process.

S102, covering the combination of the first magnet 313 and the second iron core 312 on the vertical wall top surface 3114 of the vertical wall 3112 of the first iron core 311 and fixing it by welding;

The width of the first iron core 311 is consistent with the width of the second iron core 312, and the two side edges of the second iron core 312 are attached to the top surface 3114 of the vertical wall and on the second iron core. The corresponding position on the upper surface of 312 is fixed by spot welding.

S103, bonding the coil 32 to one longitudinal end of the magnetic unit 31, and making the cavity 315 and the coil hole 322 correspond to each other;

S104, insert the vibrating part 333 of the reed 33 into the coil hole 322 and the cavity 315, and weld and fix the fixing part 331;

In this step, the vibration part 332 is suspended in the cavity 315 between the coil hole 322 and the first magnet 313 and the second magnet 314, and the extension part 334 protrudes from the magnet. The outer side of the unit 31, the fixing part 331 is supported on the upper surface of the second iron core 312 and fixed by welding, the part of the fixing part 331 located on the upper side of the coil 32 is not in contact with the coil 32 and is suspended In the set state, the tensioning portion 332 is located outside the coil 32 . When assembling, both the iron core and the reed 33 can be connected with material strips during stamping and forming, and the automatic assembly can be realized through the material strips.

The motor assembly 30 of the present application divides the iron core of the magnetic unit 31 into independent first iron cores 311 and second iron cores 312, so that the first magnets 313 and the second magnets 314 are glued together first. Bonded to the second iron core 312 and the first iron core 311, and then the second iron core 312 and the first iron core 311 are welded and fixed, thus avoiding the traditional technique of only longitudinally bonding the magnet As a result, the bonding is not firm and the automatic assembly cannot be realized.

The welding piece 40 includes a welding piece 41 bonded to the longitudinal side of the housing 10, a lead hole 411 opened on the welding piece 41 and connected to the lead outlet 123, and the lead wire 323 of the coil 32 is welded. Solder 42 on the solder pad 41 .

The working principle of the moving iron unit of the present application is as follows. When the electric signal passes through the coil 32, the motor assembly 30 is made to generate magnetism, and the vibrating part 33 of the reed 30 vibrates up and down, and the connecting rod 34 drives the The vibrating wings 22 of the diaphragm 20 vibrate up and down to generate sound signals in the upper cavity S1 and pass through the sound outlet 133 . This principle is a prior art and will not be repeated here.

The assembly of the moving iron unit of the present application includes the following steps:

S201, bonding the assembled motor assembly 30 in the lower case 12;

The assembly of the motor assembly 30 is carried out with reference to the aforementioned method. In this step, the surface of the lower shell 12 can be coated with glue, and then the motor assembly 30 is bonded downward to the surface of the lower shell 12; Specifically, the lower surface of the first iron core 311 is bonded to the lower shell 12 .

S202, inserting the middle frame 11 outside the motor assembly 30, attaching it to the lower shell 12 and fixing it by pre-welding;

In this step, the lower surface 114 of the frame body 111 of the middle frame 11 is attached to the upper surface of the lower casing side wall 122 and pre-fixed by spot welding at a part of the joint.

S203. Weld one end of the connecting rod 34 to the extension part 334, and then cover the diaphragm 20 on the upper side of the middle frame 11 so that the upper surface 113 of the frame body 111 and the lower surface of the bracket 21 Laminated and pre-welded fixed;

In this step, the outer dimension of the bracket 21 is consistent with the outer dimension of the frame body 111 , and after the two are bonded together, the junction of the frame body 111 and the surface of the bracket 21 is pre-welded and fixed from the outer periphery. In this step, the connecting rod 34 extends from the connection hole 223 and the through hole 234 of the diaphragm 20 to the upper side of the diaphragm 20 .

In this step, the diaphragm 20 can be directly bonded and fixed in the middle frame 11 without clamping the diaphragm 20 by the middle frame 11 and the upper shell 13, that is, the traditional middle frameless structure, The vibrating membrane 20 is directly bonded in the upper case, but this step causes difficulty in dispensing glue and cannot be produced automatically.

S204, dispensing glue to fix one end of the connecting rod 34 in the connecting hole 223 and the through hole 234 and seal the connecting hole 223;

S205, cover the upper shell 13 on the upper side of the diaphragm 20 and pre-weld and fix it with the bracket 21; then connect the lower shell 12, the middle frame 11, the bracket 21 of the diaphragm 20 and the upper shell from the outer periphery The outer periphery of the junction of 13 is fixed and sealed by laser welding;

The bottom surface of the upper shell side wall 132 of the upper shell 13 is attached to the upper surface of the bracket 21 and fixed by pre-welding from the outer periphery. The position of the laser welding includes the position of the joint between the lower shell 12 and the bottom of the frame body 111, the position of the joint between the frame body 111 and the bracket 21, and the position of the joint between the bracket 21 and the upper shell 13. Continuous welding is carried out by means of multiple lasers and rotating the moving iron unit to achieve sealing of each junction, so that the upper cavity S1 and the lower cavity S2 are kept in a relatively sealed state.

S206. Bond the soldering piece 41 of the soldering part 40 to the end of the housing 10 provided with the lead wire outlet 123, and at the same time weld a pair of lead wires 323 of the coil 32 to the soldering piece 41 to form the Solder42.

The moving iron unit and its manufacturing method of the present application, by dividing the shell 10 into independent lower shell 12, middle frame 11 and upper shell 13, greatly reduces the depth of the lower shell 12, and then can realize the motor assembly 30 It is automatically assembled in the lower shell 12 , and at the same time, it is convenient for the connecting rod 34 to be automatically dispensed and fixed in the connecting hole 223 and the through hole 234 after the diaphragm 20 is assembled. This design scheme greatly improves the automation capability, greatly improves the product assembly efficiency and reduces the manufacturing cost.

At the same time, the joints of the lower shell 12, the middle frame 11, the support 21 of the diaphragm 20 and the upper shell 13 are fixed by pre-welding a small number of points, and finally the outer periphery of the joint is sealed by continuous laser welding. .

The present application also includes a receiver, and the receiver includes the moving iron unit.

The above examples only express the preferred implementation of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the scope of the patent for the invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims

A moving iron unit, comprising a shell with a cavity inside, a diaphragm that divides the cavity into an upper cavity and a lower cavity, and a motor assembly fixed in the lower cavity, wherein the shell includes The lower shell, the middle frame and the upper shell, the diaphragm separates the cavity into an upper cavity and a lower cavity, the motor assembly is fixed in the lower shell, and the middle frame is sleeved outside the motor assembly It is connected and fixed with the lower shell, and the motor assembly drives the diaphragm to vibrate up and down.
The moving iron unit according to claim 1, wherein the lower case comprises a lower case and a side wall of the lower case bent upward from the outer periphery of the lower case, and the side wall of the lower case is first in the longitudinal direction. The end is provided with a lead wire outlet, and the motor assembly is fixed in the lower case by glue or welding.
The moving iron unit according to claim 2, wherein the upper case comprises an upper case, a side wall of the lower case formed by bending downward from the outer periphery of the upper case, and a side wall of the lower case formed in the longitudinal direction of the side wall of the lower case. The sound outlet on the two ends; the middle frame includes a frame body and a cavity that is located in the frame body and penetrates up and down, the lower surface of the frame body is attached and fixed to the upper surface of the side wall of the lower shell, and the The diaphragm includes a bracket, flapping wings connected to the bracket, and a film thermoformed on the bracket and the flapping wings, the bracket is clamped between the frame body and the side wall of the upper case and fixed.
The moving iron unit according to claim 3, wherein after the motor assembly is fixed in the lower case, the middle frame is inserted into the outer periphery of the motor assembly from top to bottom and the middle frame The bottom surface of the frame is attached to the top surface of the side wall of the lower case, the middle frame and the lower case are pre-fixed by discontinuous spot welding, the diaphragm is placed above the middle frame, and then the The upper shell covers the upper side of the diaphragm, the lower surface of the bracket of the diaphragm is attached to the upper surface of the frame, the upper surface of the bracket is attached to the lower surface of the side wall of the upper shell, and at the same time, the discontinuous The middle frame, diaphragm and upper case are pre-fixed by spot welding.
The moving iron unit according to claim 4, wherein the junction between the lower shell, the middle frame, the support of the diaphragm and the upper shell of the housing is sealed and welded by continuous laser welding, during welding, At the same time, multiple laser beams are used for simultaneous welding, and the shell is rotated to realize continuous welding.
The moving iron unit according to claim 3, wherein the motor assembly comprises a magnetic unit, a coil bonded to one longitudinal end of the magnetic unit, a reed and a connecting rod connecting the reed and the vibrating wing, The magnetic unit includes an iron core provided with a longitudinally penetrating accommodation space, a first magnet and a second magnet fixed on the upper and lower sides of the accommodation space, and a cavity formed between the first magnet and the second magnet. The coil includes a coil body fixed at one longitudinal end of the iron core, a coil hole passing through the coil body longitudinally and corresponding to the cavity, and a pair of lead wires extending out of the lead wire outlet, and the motor assembly is fixed by the iron core in the lower shell.
The moving iron unit according to claim 6, wherein the iron core includes a first iron core and a second iron core that are independent of each other, and the first iron core includes a bottom wall and two laterally extending from the bottom wall. A vertical wall formed by extending laterally, the first magnet is bonded and fixed on the lower surface of the second iron core, the second magnet is bonded and fixed on the inner surface of the bottom wall of the first iron core, and bonded The second iron core with the first magnet is welded and fixed on a pair of the vertical walls, the first magnet is opposite to the second magnet and a cavity is formed in the middle, and the coil is bonded to the The coil body at the longitudinal end of the first iron core and the second iron core and the coil hole corresponding to the cavity longitudinally pass through, the reed includes a fixed end and extends from the fixed end and is suspended in the coil hole and the cavity The vibrating part of the body.
The moving iron unit according to claim 6, wherein the reed includes a fixed part, a vibrating part extending from the fixing part to the coil hole and suspended in the cavity, and a vibrating part extending from the vibrating part The outer extension of the magnetic unit, the vibrating wing of the diaphragm is provided with a connection hole corresponding to the extension, one end of the connecting rod is welded on the extension, and the other end extends into the connection hole Glue is dispensed and fixed, and when the vibrating part of the reed vibrates, the vibrating wings are driven to vibrate and sound is generated in the upper chamber.
The moving iron unit according to claim 8, wherein the reed is in a U-shaped structure, and the fixing part is horizontally extended and fixed on the upper side of the iron core after being reversely bent from the vibrating part, The fixing part is bonded to the upper surface of the iron core and welded and fixed on the periphery of the bonding place, and the fixing part is partially suspended above the coil.
The moving iron unit according to claim 8, wherein the vibrating wing is located in the support, and the vibrating wing is connected to the longitudinal side of the support through a connecting part; except for the connecting part, the A gap is formed between the bracket and the flap, and the membrane includes a membrane body attached to one surface of the bracket and the flap, and a runway pressed into the gap and crossed to the other side.
The moving iron unit according to claim 10, wherein the bracket and the vibrating wing are stamped from the same sheet metal, and the bracket includes a pair of longitudinal brackets and a pair of transverse brackets connected to each other , the flapping wing is located in the longitudinal support body and the transverse support body, and the longitudinal end of the flapping wing is connected to one of the longitudinal support bodies through the connecting portion.
A method for assembling a moving iron unit, comprising the steps of:

S201. Provide a casing and a motor assembly, the casing includes a lower casing, a middle frame, and an upper casing, and fix the motor assembly in the lower casing;

S202. Put the middle frame into the motor assembly and fit and fix it with the lower case; weld a connecting rod on the motor assembly;

S203. Provide a diaphragm, the diaphragm includes a bracket, vibrating wings, and a film thermoformed on the bracket and the vibrating wings, and cover and fix the bracket of the diaphragm on the upper side of the middle frame;

S204. The motor assembly includes a magnetic unit, a coil, and a reed, and the other end of the connecting rod is fixed on the vibrating wing so that the reed and the vibrating wing are linked;

S205. Cover the upper shell on the upper side of the diaphragm and fix it with the bracket; the diaphragm divides the shell into an upper cavity and a lower cavity, and the upper cavity passes through the diaphragm and the upper shell The lower cavity is formed by surrounding the lower shell, the middle frame and the flapping wings;

S206, providing a weldment, the first longitudinal end of the lower case is provided with a lead wire outlet, the second longitudinal end of the upper case is provided with a sound outlet, the motor assembly includes a coil provided with a lead wire, and the lead wire extends to the At the outlet of the lead wire, the soldering piece includes a solder piece fixed at the longitudinal first end of the housing and solder for welding the lead wire to the solder piece.
The method for assembling the moving iron unit according to claim 12, wherein the upper case comprises an upper case and a side wall of the upper case bent downward from the outer periphery of the upper case, and the sound outlet Opened at the second longitudinal end of the side wall of the upper case; the lower case includes a lower case and a side wall of the lower case bent upward from the outer circumference of the lower case, and the lead outlet is opened on the side of the lower case The longitudinal first end of the wall.
The method for assembling the moving iron unit according to claim 13, wherein the bottom surface of the middle frame is attached to the upper surface of the side wall of the lower shell, and the bottom surface of the bracket is attached to the upper surface of the middle frame , the bottom surface of the side wall of the upper shell is attached to the upper surface of the bracket, and the joints of the lower shell, the middle frame, the bracket and the upper shell are welded by laser welding. When welding, the moving iron unit is rotated to make the laser continuous Welding is used to seal the joints of the lower shell, the middle frame, the bracket and the upper shell.
The method for assembling the moving iron unit according to claim 14, wherein the outer dimensions of the side wall of the upper case, the bracket, and the middle frame are consistent with those of the side wall of the lower case.
The method for assembling the moving iron unit according to claim 12, wherein the motor assembly includes a magnetic unit, a coil, and a reed, and the magnetic unit includes an iron core provided with a longitudinally penetrating accommodation space, fixed on the The first magnet and the second magnet on the upper and lower sides of the accommodation space and the cavity formed between the first magnet and the second magnet, the coil is provided with a coil hole corresponding to the cavity, and the reed includes A fixed part, a vibrating part extending from the fixing part and suspended in the coil hole and the cavity, and an extension part extending from the vibrating part to the outside of the magnetic unit, the vibrating wings of the diaphragm correspond to the There is a connection hole at the position of the extension part, one end of the connecting rod is welded on the extension part, and the other end is extended to the connection hole and fixed with glue. Sound is produced in the upper cavity.
The method for assembling the moving iron unit according to claim 16, wherein the reed is in a U-shaped structure, and the fixing part is horizontally extended and fixed on the iron core after being reversely bent from the vibrating part On the upper side, the fixing part is bonded to the upper surface of the iron core and welded and fixed on the periphery of the bonding place, and the fixing part is partially suspended above the coil.
The method for assembling the moving iron unit according to claim 17, wherein the iron core includes a first iron core and a second iron core, and the first iron core includes a bottom wall and two sides laterally from the bottom wall. The vertical wall formed by extending laterally, the first iron core has a U-shaped structure, the second iron core has a plate-like structure, and the first magnet and the second secondary body are bonded and fixed to the second iron core respectively. The bottom surface of the core is connected to the inner surface of the bottom wall of the first iron core, and the second iron core is covered on the vertical wall of the first iron core and fixed by welding.
The method for assembling the moving iron unit according to claim 18, wherein the assembling of the motor assembly comprises the following steps:

S101, bonding the first magnet and the second magnet to the second iron core and the first iron core respectively and curing;

S102. Cover the combination of the first magnet and the second iron core on the top surface of the vertical wall of the first iron core and fix it by welding;

S103, bonding the coil to one longitudinal end of the magnetic unit, and making the cavity and the coil hole correspond to each other;

S104. Insert the vibrating part of the reed into the coil hole and the cavity and weld and fix the fixing part; the free end side of the fixing part is attached to the upper surface of the second iron core and Welding fixed.
The method for assembling the moving iron unit according to claim 12, wherein the vibrating wing is located in the support, and the vibrating wing is connected to the longitudinal side of the support through a connecting part; except for the connecting part , a continuous gap is formed between the bracket and the flap, the membrane includes a membrane body attached to one side surface of the bracket and the flap, and is pressed into the gap and passes through to the other side. side runway.
The method for assembling the moving iron unit according to claim 20, wherein the vibrating wing is punched and protruded upwards to form ribs, and the membrane body includes ribs attached to the lower surface of the ribs. In the first part, the bracket and the vibrating wing are stamped from a sheet metal.
A receiver, characterized by comprising the moving iron unit as claimed in claim 1.