A motor assembly for a balanced armature receiver and a balanced armature receiver

Abstract

This utility model discloses a balanced armature receiver motor assembly and a balanced armature receiver. The motor assembly of the balanced armature receiver includes a reed, a coil, and a magnetic circuit assembly. The reed is generally U-shaped and includes a fixed part and a moving part arranged opposite each other, as well as a connecting part connecting the fixed part and the moving part. The magnetic circuit assembly includes a guard plate assembly and a magnet assembly connected to the guard plate assembly. The guard plate assembly has a top surface connected to the fixed part and a transition surface connected to the top surface, with a gap between the transition surface and the plane containing the top surface. The moving part passes through the coil and the magnetic circuit assembly. The fixed part is in contact with the top surface of the guard plate assembly, and the contact area between the fixed part and the top surface is provided with a groove for welding. By providing the groove, lap welding can be performed inside the fixed part and the top surface, avoiding the transition surface, reducing the risk of incomplete welding, making the welding more robust, and also helping to ensure welding quality.

Description

Technical Field

[0001] This utility model relates to the field of balanced armature receiver technology, and in particular to a motor assembly and a balanced armature receiver. Background Technology

[0002] A balanced armature receiver is an electroacoustic conversion device, typically used as a sound-generating device to convert electrical signals into sound. It is primarily used in headphones, hearing aids, wearable devices capable of producing sound, and the sound-generating units of other electronic products. A balanced armature receiver typically includes a motor assembly, a diaphragm assembly, and a drive rod. The motor assembly drives the diaphragm assembly to vibrate via the drive rod, thereby producing sound. The motor assembly includes components such as reeds, coils, edge plates, and magnets. The reed is the vibrating component of the motor assembly; when the coil is energized, the reed becomes polarized, converting the alternating current signal into mechanical vibration under the influence of the magnetic field.

[0003] The existing balanced armature receiver has a reed that is roughly U-shaped and has a fixing part that is connected to the front guard. It is fixed by lap welding the fixing part to the front guard on both sides, or by through welding from the top of the fixing part to the front guard. When welding on both sides of the fixing part, the weld point is very close to the arc of the front guard, which makes the welding unstable and prone to cold welds. When welding by through welding, the weld pool is below the reed, so the weld quality cannot be inspected from the outside, and welding problems cannot be detected by visual inspection.

[0004] Furthermore, if the fixing part is made narrower overall, the rigidity of the reed will weaken, the modality will change, and the acoustic performance of the product will be limited. In addition, the reed also has a vibrating moving part. If the fixing end of the moving part of the reed is not well fixed, the vibration generated during product operation will be greater, resulting in negative effects, such as excessive vibration causing howling.

[0005] The above content is only used to help understand the technical solution of this application and does not constitute an admission that the above is prior art. Utility Model Content

[0006] The purpose of this utility model is to provide a motor assembly and a balanced armature receiver for a balanced armature receiver, so as to improve the firmness of the welding of the fixing part of the reed and facilitate the inspection of the welding quality.

[0007] To achieve the aforementioned objectives, this utility model proposes, on the one hand, a motor assembly for a balanced armature receiver, characterized in that it comprises:

[0008] A reed, the reed being U-shaped in general, comprising a fixed portion and a movable portion disposed opposite to each other, and a connecting portion connecting the fixed portion and the movable portion;

[0009] coil; and,

[0010] A magnetic circuit assembly includes a front iron assembly and a magnet assembly connected to the front iron assembly. The front iron assembly has a top surface connected to the fixing part and a transition surface connected to the top surface. There is a gap between the transition surface and the plane where the top surface is located.

[0011] The moving part is inserted into the coil and the magnetic circuit assembly, the fixing part is attached to the top surface of the edge iron assembly, and the area where the fixing part is attached to the top surface is provided with a groove for welding.

[0012] Furthermore, the edge arm assembly has a first end face facing away from the side where the coil is located and a second end face facing the coil, and the distance between the solder joint connecting the fixing part and the edge arm assembly and the end face is not less than 0.2 mm.

[0013] Furthermore, the slot is located entirely on the top surface.

[0014] Furthermore, the slot is perforated.

[0015] Furthermore, the number of slots is one, two, or more.

[0016] Furthermore, the slot is an elongated hole extending along the width direction of the spring, or an elongated hole extending along the length direction of the spring.

[0017] Furthermore, the fixing part is provided with at least two slots spaced apart along the width or length direction of the spring.

[0018] Furthermore, the reed is provided with side wings protruding along the width direction of the reed, and one side wing is provided on each side of the reed in the width direction;

[0019] The side wing is connected to one, two, or three of the connecting part, the moving part, and the fixing part.

[0020] Furthermore, the edge iron assembly is provided with a mounting hole, the magnet assembly is disposed in the mounting hole, and includes two magnets spaced apart along the thickness direction of the moving part, the two magnets are arranged with opposite poles facing each other, the moving part passes through the coil and the two magnets, and the connecting part is located on the side of the coil away from the magnetic circuit assembly.

[0021] Secondly, this utility model proposes a balanced armature receiver, comprising:

[0022] The housing assembly is equipped with a sound outlet;

[0023] A diaphragm assembly is disposed within the housing assembly and divides the internal space of the housing assembly into a front cavity and a rear cavity, wherein the sound outlet is connected to the front cavity;

[0024] The motor assembly as described in any of the preceding claims, wherein the motor assembly is disposed within the rear cavity; and...

[0025] A drive rod is connected between the moving part and the diaphragm assembly.

[0026] Thirdly, this utility model proposes a balanced armature receiver, comprising:

[0027] The housing assembly is equipped with a sound outlet;

[0028] Two sets of diaphragm assemblies are arranged opposite each other inside the housing assembly, and the internal space of the housing assembly is divided into a front cavity and two rear cavities. The front cavity is located between the two diaphragm assemblies, and the two rear cavities are respectively located on both sides of the front cavity. The sound outlet is connected to the front cavity.

[0029] As described in any of the preceding claims, the two motor assemblies are respectively disposed within the two rear cavities; and...

[0030] Two drive rods are connected to the moving parts of the two motor assemblies and the two diaphragm assemblies, each via one of the drive rods.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] According to at least one embodiment of this utility model, the motor assembly of a balanced armature receiver includes a reed, a coil, and a magnetic circuit assembly. A moving part is disposed within the coil and magnetic circuit assembly. A fixed part is attached to the top surface of the front armature assembly, and a groove for welding is provided in the contact area between the fixed part and the top surface. By providing the groove, lap welding can be performed between the fixed part and the top surface, avoiding the transition surface and reducing the risk of incomplete welding, resulting in a more robust weld. Furthermore, visual inspection can detect any problems with the weld points, which helps ensure welding quality. Moreover, providing a welding groove in the fixed part does not affect the width of the fixed part, nor the rigidity and modality of the reed, which helps ensure its acoustic performance. Attached Figure Description

[0033] Figure 1 This is a perspective view of the motor assembly of a balanced armature receiver according to some embodiments of the present invention.

[0034] Figure 2 yes Figure 1 A cross-sectional schematic diagram of the structure shown.

[0035] Figure 3 yes Figure 1 A three-dimensional schematic diagram of the middle reed.

[0036] Figure 4 yes Figure 1 A top view of the structure shown.

[0037] Figure 5 This is a three-dimensional schematic diagram of a reed in some embodiments of the present invention. In the diagram, the slot is in the shape of a circular hole.

[0038] Figure 6 This is a three-dimensional schematic diagram of a reed in some embodiments of this utility model. In the diagram, the slot is square-shaped.

[0039] Figure 7 This is an application of some embodiments of this utility model. Figure 6 A schematic diagram of the motor assembly of the reed shown.

[0040] Figure 8 This is a three-dimensional schematic diagram of a reed in some embodiments of the present invention. In the diagram, the reed has side wings.

[0041] Figure 9 yes Figure 8 The diagram shows the side wing of the reed connecting to the housing assembly.

[0042] Figure 10 This is a cross-sectional schematic diagram of a balanced armature receiver according to some embodiments of the present invention.

[0043] Figure 11 This is a three-dimensional schematic diagram of a balanced armature receiver according to some embodiments of this utility model.

[0044] Figure 12 yes Figure 11 The exploded view of the structure shown.

[0045] Figure 13 yes Figure 11 A cross-sectional schematic diagram of the structure shown. Detailed Implementation

[0046] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0047] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0048] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0049] like Figures 1 to 3 As shown, some embodiments of this utility model propose a motor assembly for a balanced armature receiver, which includes a reed 20, a coil 21, and a magnetic circuit assembly 22.

[0050] The reed 20 is U-shaped in general. It includes a fixed part 200 and a moving part 201 that are disposed opposite to each other, and a connecting part 202 that connects the fixed part 200 and the moving part 201. The connecting part 202 is connected to one end of the fixed part 200 and the moving part 201 in the length direction, so that the fixed part 200, the moving part 201 and the connecting part 202 form a U-shaped overall shape.

[0051] The magnetic circuit assembly 22 includes an edge arm assembly 220 and a magnet assembly 221 connected to the edge arm assembly 220. A moving part 201 passes through the coil 21 and the magnetic circuit assembly 22. Specifically, the edge arm assembly 220 has a mounting hole 2202, and the magnet assembly 221 is disposed within the mounting hole 2202. It includes two magnets 2210 spaced apart along the thickness direction of the moving part 201, with opposite poles of the two magnets 2210 facing each other; for example, the N pole and S pole of the two magnets 2210 are adjacent. The moving part 201 passes between the coil 21 and the two magnets 2210. A connecting part 202 is located on the side of the coil 21 facing away from the magnetic circuit assembly 22. The end of the moving part 201 connected to the connecting part 202 is its connecting end, and the other end is a suspended end. When an alternating current is applied to the coil 21, the suspended end of the moving part 201 is alternately polarized into N and S poles, and then vibrates under the magnetic force of the magnet assembly 221.

[0052] The edge arm assembly 22 can be a one-piece molded ring-shaped edge arm, or it can be composed of two or more edge arms connected together. The magnet 2210 is connected to the inner surface of the edge arm assembly 22, enabling the formation of a magnetic circuit through the edge arm assembly 22 and improving the efficiency of magnetic field utilization. For example... Figure 1 and Figure 2As shown, the guard plate assembly 22 has a top surface 2200 connected to the fixing part 200, and the top surface 2200 is planar. Simultaneously, the guard plate assembly 22 has a transition surface 2201 at at least one end along the width direction of the fixing part 200. There is a gap between the transition surface 2201 and the plane containing the top surface 2200. For example, the guard plate assembly 22 may have rounded corners, thus forming an arc-shaped transition surface 2201 connected to the top surface 2200; or the guard plate assembly 22 may have chamfered corners, thus forming a beveled transition surface 2201 connected to the top surface 2200. The transition surface 2201 extends outward from the top surface 2200, and there is a gap between it and the plane containing the top surface 2200, with the gap gradually increasing as the transition surface 2201 extends outward. Optionally, the top surface 2200 has transition surfaces 2201 connected to both ends of the fixing part 200 in the width direction.

[0053] It should be noted that in this application, both the moving part 201 and the fixing part 200 are in the form of plates. The spring 20, the moving part 201, and the fixing part 200 are the same in the length direction, width direction, and thickness direction.

[0054] The fixing part 200 is attached to the top surface 2200 of the edge iron assembly 220, and the contact area between the fixing part 200 and the top surface 2200 is provided with a groove 2000 for welding. By providing the groove 2000, lap welding can be performed between the fixing part 200 and the top surface 2200 inside the fixing part 200. The welding position avoids the transition surface 2201, reducing the risk of incomplete welding and resulting in a stronger weld. Furthermore, visual inspection can detect any problems with the weld points, which helps ensure welding quality. Figure 1 and Figure 2 As shown, the solder joint 5 is at least connected between the side surface 2000a of the slot 2000 and the top surface 2200.

[0055] It is understood that the side 2000a of the slot 2000 is at least partially located on the top surface 2200 so that the side 2000a of the slot 2000 and the top surface 2200 can be connected by the solder point 5. It is also understood that the solder point 5 may be partially located on the surface of the fixing part 200 away from the edge iron assembly 220 to improve the connection strength.

[0056] The edge arm assembly 220 has a first end face 220a facing away from the coil 21 and a second end face 220b facing the coil 21. The distance L1 between the solder point 5 connecting the fixing part 200 and the edge arm assembly 220 and the first end face 220a is not less than 0.2mm, and the distance L2 between the solder point 5 and the second end face 220b is not less than 0.2mm. This is to prevent the welding strength and stability of the spring 20 from deteriorating due to the solder point 5 being too close to the end face 220a of the edge arm assembly 220, and to further ensure the reliability of the welding and the acoustic performance of the product. The distance between the solder point 5 and the end face can be understood as the distance between the side face 2000a and the end face 220a.

[0057] In some embodiments, the slot 2000 is entirely located on the top surface 2200, allowing for a longer weldable length between the slot 2000 and the top surface 2200, which further enhances the weld's strength. In other embodiments, the slot 2000 may also be partially located on the top surface 2200 and partially positioned opposite the transition surface 2201.

[0058] In some embodiments, the slot 2000 is hole-shaped, meaning that the side surface 2000a of the slot 2000 is a closed ring. The shape of the hole can be, for example, rectangular, triangular, trapezoidal, or other irregularly shaped holes, etc. Figure 5 The circular slot 2000 is shown. Figure 1 and Figure 6 A rectangular slot 2000 is shown. Optionally, at least a portion of the side 2000a of the slot 2000 extends along the width direction of the fixing portion 200 to facilitate welding.

[0059] The number of slots 2000 can be one, two, or more.

[0060] In some embodiments, such as Figure 3 As shown, the slot 2000 is an elongated hole extending along the width direction of the fixing portion 200, and its side surface 2000a extending along the width direction is longer. In other embodiments, the slot 2000 may also be an elongated hole extending along the length direction of the fixing portion 200.

[0061] In some embodiments, the fixing part 200 is provided with at least two slots 2000 spaced apart along the width direction of the spring 20. For example, the fixing part 200 has a symmetry plane 200a perpendicular to its width direction, and at least one slot 2000 is provided on each side of the symmetry plane 200a. Figures 5 to 7 In the middle, a slot 2000 is provided on each side of the symmetry plane 200a. Optionally, the two slots 2000 are symmetrical. In other embodiments, the fixing part 200 is provided with at least two slots 2000 spaced apart along the length direction of the spring 20.

[0062] In some embodiments, the reed 20 has side wings 203 protruding along its width direction, and the side wings 203 can be connected to one, two, or three of the connecting portion 202, the moving portion 201, and the fixing portion 200. For example... Figure 8 As shown, a side wing 203 is provided at the connection position between the connecting part 202 and the moving part 201. The side wing 203 protrudes along the width direction of the spring 20 and is connected to both the connecting part 202 and the moving part 201. The side wing 203 can be connected to an external fixed object, such as the housing assembly 1 of the balanced armature receiver, which can effectively reduce the vibration caused by the product during operation, thereby avoiding howling under extreme operating conditions. Figure 9 In this assembly, the side wing 203 is bonded to the outer casing assembly 1 with adhesive 204. Optionally, there are two side wings 203, one on each side of the spring 20 in the width direction. It is understood that the side wing 203 may be connected only to the connecting part 202, only to the moving part 201, or only to the fixing part 200. When it is connected to two or three parts at the same time, the effect can be better guaranteed.

[0063] Some embodiments of this utility model also propose a balanced armature receiver, see reference. Figure 10 It includes a housing assembly 1, a diaphragm assembly 3, a motor assembly 2, and a drive rod 4.

[0064] The housing assembly 1 is provided with a sound outlet 10, which can be formed by connecting two or more parts. Figure 10 In the case, the outer casing assembly 1 includes a housing 13 with one end open and a cover plate 14 connected to the open end of the housing 13, and a sound outlet 10 is provided on the housing 13.

[0065] The diaphragm assembly 3 is disposed within the housing assembly 1, dividing the internal space of the housing assembly 1 into a front cavity 11 and a rear cavity 12. The sound outlet 10 communicates with the front cavity 11. The structure of the diaphragm assembly 3 can refer to the structure of the diaphragm assembly 3 in the prior art. Generally, it includes an annular frame, a vibrating plate disposed within the annular frame, and a thin film covering the space between the annular frame and the vibrating plate. One end of the vibrating plate is fixed and the other end is suspended, allowing it to vibrate relative to the annular frame.

[0066] Motor assembly 2 is the motor assembly described in any of the above embodiments. Drive rod 4 is connected between the moving part 201 of motor assembly 2 and diaphragm assembly 3. When the moving part 201 vibrates, the power is transmitted to diaphragm assembly 3 through drive rod 4, causing diaphragm assembly 3 to vibrate. The sound generated by the vibration of diaphragm assembly 3 is transmitted from the sound outlet 10, so that people can hear the sound.

[0067] This utility model also proposes another embodiment of a balanced armature receiver, such as... Figures 11 to 13 As shown, it includes two diaphragm assemblies 3, two motor assemblies 2, and two drive rods 4.

[0068] The housing assembly 1 includes two housings 13 with one end open, the open ends of the two housings 13 are connected together, and the housing assembly 1 is provided with a sound outlet 10.

[0069] Both diaphragm assemblies 3 are disposed within the housing assembly 1 and are arranged opposite to each other, dividing the internal space of the housing assembly 1 into a front cavity 11 and two rear cavities 12. The front cavity 11 is located between the two diaphragm assemblies 3, and the two rear cavities 12 are located on both sides of the front cavity 11. The sound outlet 10 communicates with the front cavity 11. Optionally, at least one housing 13 is provided with a sound outlet 10 communicating with the front cavity 11. In the illustrated embodiment, both housings 13 are provided with sound outlets 10 communicating with the end face of the open end of the housing 13, and the sound outlets 10 on the two housings 13 are joined to form a larger sound outlet.

[0070] Two motor assemblies 2 are respectively disposed in two rear cavities 12. The motor assembly 2 can be the motor assembly 2 described in any of the above embodiments, or it can be the motor assembly 2 in the prior art (e.g., the fixing part 200 does not have a slot 2000).

[0071] The moving parts 201 of the two motor assemblies 2 and the two diaphragm assemblies 3 are each connected by a drive rod 4. Each motor assembly 2 can drive the adjacent diaphragm assembly 3 to vibrate and produce sound, which helps to improve the sound effect. For example, the two motor assemblies 2 can emit the same sound at the same time to increase the volume, or they can emit different sounds to enrich the sound layers. Alternatively, one of the two motor assemblies 2 can work while the other remains as a backup to improve the reliability of the balanced armature receiver.

[0072] For ease of description, the motor assembly 2, the diaphragm assembly 3, and the drive rod 4 connected between them are referred to as the sound generating unit. Optionally, the two sound generating units are symmetrical. The symmetrical movement of the two motor assemblies 2 can minimize the vibration caused by the product during operation, thereby avoiding howling. In other embodiments, the two sound generating units can also be asymmetrical. For example, one is larger and the other is relatively smaller. The larger one can provide better low-frequency performance, while the smaller one can effectively improve high-frequency performance, thereby improving the performance across the entire frequency range.

[0073] Optionally, the housing assembly 1 may also include a sound outlet tube 16 covering the outside of the sound outlet 10.

[0074] The above are merely specific embodiments of this utility model. Any improvements made based on the concept of this utility model shall be considered within the scope of protection of this utility model.

Claims

1. A motor assembly for a balanced armature receiver, characterized in that, include: The spring (20) is U-shaped in general and includes a fixed part (200) and a moving part (201) disposed opposite to each other, and a connecting part (202) connecting the fixed part (200) and the moving part (201). Coil (21); and, The magnetic circuit assembly (22) includes an iron edge assembly (220) and a magnet assembly (221) connected to the iron edge assembly (220). The iron edge assembly (220) is provided with a top surface (2200) connected to the fixing part (200) and a transition surface (2201) connected to the top surface (2200). There is a gap between the transition surface (2201) and the plane where the top surface (2200) is located. The moving part (201) passes through the coil (21) and the magnetic circuit assembly (22), the fixing part (200) is attached to the top surface (2200) of the edge iron assembly (220), and the area where the fixing part (200) and the top surface (2200) are attached is provided with a groove (2000) for welding.

2. The motor assembly of the balanced armature receiver as claimed in claim 1, characterized in that, The edge iron assembly (220) has a first end face (220a) facing away from the coil (21) and a second end face (220b) facing the coil (21). The distance between the solder joint (5) connecting the fixing part (200) and the edge iron assembly (220) and the first end face (220a) and the second end face (220b) is not less than 0.2mm.

3. The motor assembly of the balanced armature receiver as claimed in claim 1, characterized in that, The slot (2000) is located entirely on the top surface (2200).

4. The motor assembly of the balanced armature receiver as claimed in claim 1, characterized in that, The slot (2000) is perforated.

5. The motor assembly of the balanced armature receiver as described in claim 4, characterized in that, The number of slots (2000) is one, two, or more.

6. The motor assembly of the balanced armature receiver as claimed in claim 4, characterized in that, The slot (2000) is an elongated hole extending along the width direction of the spring (20), or an elongated hole extending along the length direction of the spring (20).

7. The motor assembly of the balanced armature receiver as claimed in claim 4, characterized in that, The fixing part (200) is provided with at least two slots (2000) spaced apart along the width or length direction of the spring (20).

8. The motor assembly of the balanced armature receiver as claimed in any one of claims 1 to 7, characterized in that, The reed (20) is provided with a side wing (203) protruding along the width direction of the reed (20), and a side wing (203) is provided on each side of the width direction of the reed (20). The side wing (203) is connected to one, two, or three of the connecting part (202), the moving part (201), and the fixing part (200).

9. The motor assembly of the balanced armature receiver as claimed in any one of claims 1 to 7, characterized in that, The edge iron assembly (220) is provided with a mounting hole (2202), the magnet assembly (221) is disposed in the mounting hole (2202), and includes two magnets (2210) spaced apart along the thickness direction of the moving part (201). The two magnets (2210) are arranged opposite poles facing each other. The moving part (201) passes through the coil (21) and the two magnets (2210). The connecting part (202) is located on the side of the coil (21) away from the magnetic circuit assembly (22).

10. A balanced armature receiver, characterized in that, include: The outer casing assembly (1) is provided with a sound outlet (10); A diaphragm assembly (3) is disposed inside the housing assembly (1) and divides the internal space of the housing assembly (1) into a front cavity (11) and a rear cavity (12). The sound outlet (10) is connected to the front cavity (11). The motor assembly (2) as claimed in any one of claims 1 to 9, wherein the motor assembly (2) is disposed within the rear cavity (12); and, The drive rod (4) is connected between the motion part (201) and the diaphragm assembly (3).

11. A balanced armature receiver, characterized in that, include: The outer casing assembly (1) is provided with a sound outlet (10); Two sets of opposing diaphragm assemblies (3) are disposed inside the housing assembly (1) and divide the internal space of the housing assembly (1) into a front cavity (11) and two rear cavities (12). The front cavity (11) is located between the two diaphragm assemblies (3), and the two rear cavities (12) are located on both sides of the front cavity (11). The sound outlet (10) is connected to the front cavity (11). Two motor assemblies (2) as described in any one of claims 1 to 9, the two motor assemblies (2) being respectively disposed within the two rear cavities (12); and, The two drive rods (4), the moving parts (201) of the two motor assemblies (2), and the two diaphragm assemblies (3) are each connected by one of the drive rods (4).

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