CN210536940U

CN210536940U - Magnetic circuit system unit and forming device

Info

Publication number: CN210536940U
Application number: CN201921800649.6U
Authority: CN
Inventors: 任玉胜; 郑良辉; 任媛
Original assignee: Yangzhou Tenji Technology Co ltd
Current assignee: Yangzhou Tenji Technology Co ltd
Priority date: 2019-10-24
Filing date: 2019-10-24
Publication date: 2020-05-15
Anticipated expiration: 2029-10-24

Abstract

The utility model discloses a magnetic circuit system unit and a forming device, which comprises a magnetic cover, a main pole piece, an auxiliary pole piece, main magnets and auxiliary magnets, wherein the magnetic cover, the main pole piece and the main magnets are provided with first connecting pieces in a common penetrating way, and the magnetic cover, the auxiliary magnets and the auxiliary pole pieces are provided with second connecting pieces in a common penetrating way; the magnetic circuit system unit further comprises a voice coil and a diaphragm, the voice coil is placed between the main pole piece and the auxiliary pole piece, and the diaphragm is covered on the auxiliary pole piece. The utility model discloses can improve the precision of magnetic circuit unit assembly.

Description

Magnetic circuit system unit and forming device

Technical Field

The utility model relates to a speaker equipment field, concretely relates to magnetic circuit unit and forming device.

Background

The components of the micro-speaker are often small, requiring a rather elaborate assembly process to achieve structural assembly, with process complexity and machine costs contributing significantly to product manufacturing costs. It is therefore important to focus as much as possible on the automation possibilities and to reduce as much as possible the difficulty of the assembly process in the design. The AB glue is generally adopted to realize the bonding of each component of the magnetic circuit of the micro-speaker at present, but the precision requirement on the assembly tool of the magnetic circuit component is extremely high during the assembly, and some components of the magnetic circuit can deviate by slight errors. Meanwhile, the AB glue can fail at high temperature and other abnormal environments, so that the magnetic circuit structure is unstable. When a component of the magnetic circuit is deviated, harsh noise or uneven vibration of the diaphragm can be easily caused by ring wiping, friction and polarization, and the product is unqualified.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to provide a magnetic circuit unit and forming device, its precision that can improve the magnetic circuit unit assembly.

In order to solve the technical problem, the utility model provides a magnetic circuit system unit, which comprises a magnetic shield, a main pole piece, an auxiliary pole piece, a main magnet and an auxiliary magnet, wherein a first connecting piece is commonly arranged in the magnetic shield, the main pole piece and the main magnet in a penetrating way, and a second connecting piece is commonly arranged in the magnetic shield, the auxiliary magnet and the auxiliary pole piece in a penetrating way; the magnetic circuit system unit further comprises a voice coil and a diaphragm, the voice coil is placed between the main pole piece and the auxiliary pole piece, and the diaphragm is covered on the auxiliary pole piece.

Furthermore, the magnetic cover and the main pole piece are coaxially provided with a first communicating hole matched with the first connecting piece, the magnetic cover and the auxiliary pole piece are coaxially provided with a second communicating hole matched with the second connecting piece, and the first communicating hole and the second communicating hole are stepped holes.

Furthermore, the first connecting piece and the second connecting piece are both formed by injection molding.

Another object of the present invention is to provide a molding apparatus for assembling a magnetic circuit unit, comprising a fixed frame and an injection molding pad, wherein the auxiliary pole piece, the auxiliary magnet, the main pole piece, the main magnet and the magnetic shield are sequentially placed in the fixed frame; the auxiliary magnet is arranged around the main magnet, two opposite surfaces of the auxiliary magnet are respectively attached to the magnetic cover and the auxiliary pole piece, a plurality of limiting blocks are convexly arranged on the surface of the fixed frame, and all the limiting blocks can be attached to the side wall of the magnetic cover to relatively fix the magnetic cover and the fixed frame; the injection molding welding plate is embedded in the corner of the fixed frame and is arranged corresponding to the bevel edge part of the auxiliary pole piece; the fixed frame can be placed in an injection mold to injection mold the first connecting piece and the second connecting piece.

Furthermore, a plurality of stop blocks are arranged on the surface of the fixed frame, the stop blocks are attached to the auxiliary magnets, and all the limiting blocks are correspondingly arranged on the stop blocks; and the opposite surfaces of the two oppositely arranged check blocks are provided with convex parts which can be embedded into the auxiliary magnets.

Furthermore, the inner wall of the fixed frame is provided with a limiting surrounding edge in a surrounding manner, and the limiting surrounding edge can be attached to the auxiliary pole piece to limit the position of the auxiliary pole piece.

Furthermore, a plurality of supporting columns are arranged on the fixed frame, and the supporting columns and the limiting blocks are respectively located on the surfaces, opposite to the fixed frame, of the fixed frame.

Further, a release agent is coated on the fixing frame.

The utility model has the advantages that:

magnetism cover, main magnet and main pole piece pass through first connecting piece relatively fixed, and magnetism cover, auxiliary magnet and auxiliary pole piece pass through second connecting piece relatively fixed, can improve the precision of magnetic circuit unit assembly, and increase magnetic structure's stability reduces because the error leads to magnetic circuit assembly's skew and the ear-piercing noise that wiping circle, vibration unbalance cause.

Drawings

Fig. 1 is an overall schematic view of the present invention;

fig. 2 is an exploded view of the present invention;

fig. 3 is a schematic structural diagram of the present invention;

fig. 4 is a schematic structural view of the fixing frame.

The reference numbers in the figures illustrate: 11. a magnetic shield; 12. a main pole piece; 13. a secondary pole piece; 14. a main magnet; 15. a secondary magnet; 16. a voice coil; 17. a membrane; 2. a first connecting member; 21. a first communication hole; 3. a second connecting member; 31. a second communication hole; 4. a fixed frame; 41. injection molding a bonding pad; 42. a support pillar; 43. limiting surrounding edges; 44. a limiting block; 45. a stopper; 451. a projection.

Detailed Description

The present invention is further described with reference to the following drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.

Referring to fig. 1 and 2, an embodiment of a magnetic circuit unit according to the present invention includes a magnetic shield 11, a main pole piece 12, a sub-pole piece 13, a main magnet 14, and a sub-magnet 15, wherein the magnetic shield 11, the main magnet 14, and the main pole piece 12 are sequentially attached. The sub magnet 15 is disposed around the main magnet 14, and opposite surfaces of the sub magnet 15 are bonded to the magnetic cover 11 and the sub pole piece 13, respectively. In order to increase the stability of the magnetic structure, the magnetic cover 11, the main magnet 14 and the main pole piece 12 are relatively fixed through the first connecting piece 2, and the magnetic cover 11, the auxiliary magnet 15 and the auxiliary pole piece 13 are relatively fixed through the second connecting piece 3. In the embodiment, the first connecting piece 2 and the second connecting piece 3 are injection-molded pieces, that is, the magnetic cover 11, the main magnet 14 and the main pole piece 12 are relatively fixed, and then the first connecting piece 2 is directly formed by injection molding; similarly, the magnetic cover 11, the auxiliary magnet 15 and the auxiliary pole piece 13 are relatively fixed, and then the second connecting piece 3 is directly formed by injection molding. The first connecting piece 2 and the second connecting piece 3 are directly formed by injection molding, so that the stability of a magnetic circuit structure can be improved, and the noise caused by the deviation of a magnetic circuit assembly caused by errors and the occurrence of friction ring and vibration imbalance is reduced.

Referring to fig. 1-3, the magnetic shield 11 and the main pole piece 12 are coaxially provided with a first communicating hole 21 matched with the first connecting piece 2, and the magnetic shield 11 and the auxiliary pole piece 13 are coaxially provided with a second communicating hole 31 matched with the second connecting piece 3. And the first communicating hole 21 and the second communicating hole 31 are stepped holes, so that in the process of forming the first connecting piece 2 and the second connecting piece 3 by injection molding, the first communicating hole 21 and the second communicating hole 31 can be used for containing part of glue, so that the areas of the two end parts of the first connecting piece 2 and the second connecting piece 3 formed by injection molding are larger than the area of the middle part of the first connecting piece 2 and the second connecting piece 3, the first connecting piece 2 and the second connecting piece 3 are not easy to separate, the stability of the magnetic circuit structure is improved, and the assembly precision of the magnetic circuit system unit can be improved.

Referring to fig. 1 and 2, the magnetic circuit system unit further includes a voice coil 16 and a diaphragm 17, the voice coil 16 is disposed in the gap between the main pole piece 12 and the sub-pole piece 13, and the diaphragm 17 is disposed on the sub-pole piece 13. Firstly, the magnetic cover 11, the main pole piece 12 and the main magnet 14 are fixed through the first connecting piece 2, and the magnetic cover 11, the auxiliary magnet 15 and the auxiliary pole piece 13 are fixed through the second connecting piece 3, then the voice coil 16 is placed in a gap between the main pole piece 12 and the auxiliary pole piece 13, and then the diaphragm 17 is covered on the auxiliary pole piece 13, so that the assembly of the magnetic circuit system unit is completed. Therefore, the components of the magnetic circuit system unit are in the prior art, and the functions of the components are not described in detail herein.

A molding apparatus for assembling the above magnetic circuit system unit, referring to fig. 1 to 4, includes a fixing frame 4 and an injection molding pad 41, by which fixing of the magnetic shield 11, the main pole piece 12 and the main magnet 14, and the magnetic shield 11, the sub magnet 15 and the sub pole piece 13 can be achieved, and then the molding apparatus is placed in an injection mold, thereby molding the first connection member 2 and the second connection member 3.

Referring to fig. 2 and 4, the injection molding pad 41 is first placed in the fixed frame 4, and then the sub pole piece 13, the sub magnet 15, the main pole piece 12, the main magnet 14, and the magnetic cover 11 are sequentially placed inside the fixed frame 4. In this embodiment, the two injection lands 41 are disposed at positions corresponding to the oblique edge portions of the sub-pole piece 13, so that the stability of the sub-pole piece 13 when fixed can be increased by the abutment of the injection lands 41 and the sub-pole piece 13.

Referring to fig. 2 and 4, a plurality of stoppers 44 are convexly disposed on the surface of the fixing frame 4, and all the stoppers 44 can be attached to the side wall of the magnetic shield 11, so that the stoppers 44 limit the position of the magnetic shield 11 to reduce the offset of the position of the magnetic shield 11. Meanwhile, the inner wall of the fixed frame 4 is provided with a limiting surrounding edge 43 in a surrounding manner, the limiting surrounding edge 43 can be attached to the lower surface of the auxiliary pole piece 13, so that the position of the auxiliary pole piece 13 relative to the fixed frame 4 is limited, and the auxiliary pole piece 13, the auxiliary magnet 15, the main pole piece 12, the main magnet 14 and the magnetic cover 11 which are sequentially arranged in the fixed frame 4 can be relatively fixed by utilizing the matching of the limiting surrounding edge 43 and the limiting block 44.

Referring to fig. 4, a plurality of stoppers 45 are provided on the surface of the fixed frame 4, and the stoppers 45 regulate the position of the sub-magnet 15. All the stoppers 45 are arranged in an even number, and the two stoppers 45 arranged oppositely are respectively positioned at two sides of the auxiliary magnet 15 to be embedded in the auxiliary magnet 15. The opposite surfaces of the two oppositely arranged stoppers 45 are respectively provided with a convex part 451 in a protruding way, and the stability of fixing the auxiliary magnet 15 can be enhanced by embedding the auxiliary magnet 15 in the convex part 451. Meanwhile, the limiting block 44 is fixedly arranged on the stop block 45.

Referring to fig. 1, a plurality of support columns 42 are provided on a fixing frame 4, and the support columns 42 are provided on a surface opposite to a stopper 45 to support the fixing frame 4, while the fixing frame 4 is separated from a placing surface by a certain gap using the support columns 42, thereby facilitating taking of the support columns 42.

Referring to fig. 1, a release agent is coated on the fixing frame 4 so as to separate the magnetic circuit system unit embedded inside.

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model. The protection scope of the present invention is subject to the claims.

Claims

1. A magnetic circuit system unit is characterized by comprising a magnetic shield, a main pole piece, an auxiliary pole piece, main magnets and auxiliary magnets, wherein a first connecting piece is arranged in the magnetic shield, the main pole piece and the main magnets in a penetrating mode, and a second connecting piece is arranged in the magnetic shield, the auxiliary magnets and the auxiliary pole piece in a penetrating mode; the magnetic circuit system unit further comprises a voice coil and a diaphragm, the voice coil is placed between the main pole piece and the auxiliary pole piece, and the diaphragm is covered on the auxiliary pole piece.

2. The magnetic circuit system unit according to claim 1, wherein the magnetic cover and the main pole piece coaxially define a first communication hole for engaging with the first connecting member, the magnetic cover and the auxiliary pole piece coaxially define a second communication hole for engaging with the second connecting member, and the first communication hole and the second communication hole are stepped holes.

3. The magnetic circuit system unit of claim 1, wherein the first connecting member and the second connecting member are injection molded.

4. A molding device for assembling the magnetic circuit system unit of claim 1, comprising a fixed frame and an injection molding pad, wherein the auxiliary pole piece, the auxiliary magnet, the main pole piece, the main magnet and the magnetic cover are sequentially placed in the fixed frame; the auxiliary magnet is arranged around the main magnet, two opposite surfaces of the auxiliary magnet are respectively attached to the magnetic cover and the auxiliary pole piece, a plurality of limiting blocks are convexly arranged on the surface of the fixed frame, and all the limiting blocks can be attached to the side wall of the magnetic cover to relatively fix the magnetic cover and the fixed frame; the injection molding welding plate is embedded in the corner of the fixed frame and is arranged corresponding to the bevel edge part of the auxiliary pole piece; the fixed frame can be placed in an injection mold to injection mold the first connecting piece and the second connecting piece.

5. The molding device as defined in claim 4, wherein a plurality of stoppers are disposed on the surface of the fixed frame, the stoppers are attached to the secondary magnets, and all the stoppers are correspondingly disposed on the stoppers; and the opposite surfaces of the two oppositely arranged check blocks are provided with convex parts which can be embedded into the auxiliary magnets.

6. The molding device as claimed in claim 4, wherein the inner wall of the fixed frame is provided with a position-limiting surrounding edge around the inner wall, and the position-limiting surrounding edge can be attached to the auxiliary pole piece to limit the position of the auxiliary pole piece.

7. The molding apparatus as defined in claim 4, wherein the fixed frame is provided with a plurality of support posts, and the support posts and the stop blocks are respectively located on opposite surfaces of the fixed frame.

8. The molding apparatus as defined in claim 4, wherein said stationary frame is coated with a release agent.