CN112492461B - Loudspeaker - Google Patents

Abstract

The invention discloses a loudspeaker, which comprises a vibration component and a magnetic circuit component for driving the vibration component, wherein the magnetic circuit component comprises magnetic steel and a magnetic cover which is connected with the magnetic steel in an adhesive manner, the magnetic cover comprises an assembly surface facing the magnetic steel, a groove structure facing the magnetic steel is formed on the assembly surface of the magnetic cover, the groove structure comprises a plurality of first grooves, the first grooves are distributed at intervals along the circumferential direction, each first groove comprises a radial inner end and a radial outer end, and the radial outer ends of two adjacent first grooves are spaced apart from each other, causing damage to the speaker.

Description

Loudspeaker

Technical Field

The invention relates to the technical field of speakers, in particular to a magnetic circuit assembly of a speaker.

Background

The speaker is an important acoustic component in the portable electronic device, is used for converting sound wave signals into sound signals and transmitting the sound signals, and is an electroacoustic energy conversion device. The loudspeaker comprises a vibration component and a magnetic circuit component for driving the vibration component to vibrate, wherein the magnetic circuit component is generally composed of a magnetic cover and magnetic steel bonded and fixed on the magnetic cover, and a magnetic gap is formed between the magnetic steel and the magnetic cover and used for being connected with a voice coil of the vibration component in an inserting mode. In the existing loudspeaker structure, the magnetic steel and the magnetic cover are connected and fixed through an adhesive, the adhesive is a brittle material after being cured, the sensitivity to tensile strain or shear strain is high, and cracks can be generated by small strain. This makes the speaker receive the impact, often can cause the adhesive fracture and then lead to the magnet steel to drop from the magnetic shield in drop test for example, lead to the speaker to damage.

In addition, the impact resistance of the adhesive is also related to the surface quality of the adhesive and the glued object. In the process of processing, transporting and storing the adhered materials, oxidation, oil stain, dust and other impurities exist on the surfaces of the adhered materials, and the adhered materials need to be subjected to surface treatment before adhesion. The surface roughness of the bonded object can also increase the stress concentration coefficient of the adhesive, so that a larger stress concentration area can be formed on the surface of the adhesive of the bonded object during impact, and the impact resistance of the adhesive is not facilitated.

Disclosure of Invention

In view of the above, an impact resistant speaker is provided.

The invention provides a loudspeaker which comprises a vibration assembly and a magnetic circuit assembly for driving the vibration assembly, wherein the magnetic circuit assembly comprises magnetic steel and a magnetic cover which is connected with the magnetic steel in an adhesion mode, the magnetic cover comprises an assembly surface facing the magnetic steel, a groove structure facing the magnetic steel is formed in the assembly surface of the magnetic cover, the groove structure comprises a plurality of first grooves, the first grooves are distributed at intervals along the circumferential direction, each first groove comprises a radial inner end and a radial outer end, and the radial outer ends of two adjacent first grooves are spaced.

Further, the first groove comprises a first side edge and a second side edge which are opposite in the circumferential direction, and the spacing width of the first side edge and the second side edge in the circumferential direction is gradually reduced from the radial outer end of the first groove to the radial inner end of the first groove.

Further, first recess includes relative first side and second side in the circumference, first side is the curvilinear edge with the second side, first recess interval width in the circumference by the radial outer end to the radial inner end of first recess keeps unchangeable.

Further, the first side edge and the second side edge are both straight line edges; or both the first side edge and the second side edge are curved edges; or one of the first side edge and the second side edge is a straight side, and the other side edge is a curved side.

Further, first side and second side are the curved edge, first side with the crooked direction of second side is unanimous, second side curvature is 3-8 times of first side curvature.

Further, the curve equation of the first side is y = x ^ 1/2; the curve equation of the second side edge is y = x ^ 3.

Furthermore, the first grooves further comprise third sides, the third sides are connected between the radial outer ends of the first sides and the radial outer ends of the second sides, the whole groove structure is circular, the third sides of the plurality of first grooves are part of circular edge lines, and the radius of the circle is 3-6 times of the depth of the first grooves; or the whole groove structure is square, the third side edges of the first grooves are part of square edge lines, and the side length of the square edge lines is 6-9 times of the depth of the first grooves.

Further, the groove structure further comprises a spacer formed between two adjacent first grooves, and the circumferential width of the spacer gradually increases from inside to outside along the radial direction.

Further, the ratio of the total area of the spacers to the total area of the groove structure is 1/8-1/4.

Further, the groove structure further comprises second grooves surrounded by the first grooves, the radial inner end of each first groove is communicated with the second grooves, and the radial inner ends of two adjacent first grooves are communicated through the second grooves.

Furthermore, the groove structure further comprises spacers formed between two adjacent first grooves, each spacer is rounded at one end connected with the second groove, and the size of the rounded corner is the depth of the first groove.

Further, the depth of the second groove is 2-4 times of the depth of the first groove.

Further, the upper surface of the magnetic shield is electroplated with a metal coating, and the thickness of the metal coating is 5-10 microns.

Compared with the prior art, the groove structure of the magnetic cover of the loudspeaker is provided with the plurality of first grooves distributed at intervals along the circumferential direction, so that the risk of impact instability of the magnetic cover in all directions when the magnetic cover falls off can be effectively avoided; the tie coat that forms correspondingly is the burst formula structure, turns into the extrusion effect with original shear effect when receiving the impact, reduces the tie coat and receives the shearing risk to the tie coat is cracked and leads to magnet steel to drop from the magnetism cover when avoiding falling, and then the speaker that causes is impaired, improves the reliability of speaker product.

Drawings

Fig. 1 is a schematic structural diagram of a speaker according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a magnetic cover of an embodiment of the speaker of the present invention.

FIG. 3 is a schematic plan view of the groove structure of the magnetic shield of FIG. 2.

Fig. 4 is a schematic plan view of an adhesive layer of a speaker according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a magnetic cover of a loudspeaker according to a second embodiment of the present invention.

Fig. 6 is a schematic structural view of a second embodiment of an adhesive layer of the speaker of the present invention.

Fig. 7 is a schematic plan view of a groove structure of a magnetic cover of a speaker according to a third embodiment of the present invention.

Fig. 8 is a schematic plan view of a fourth embodiment of the groove structure of the magnetic shield of the loudspeaker of the present invention.

Fig. 9 is a schematic plan view of a fifth embodiment of the groove structure of the magnetic cover of the speaker of the present invention.

Fig. 10 is a schematic plan view of a sixth embodiment of the groove structure of the magnetic cover of the speaker of the present invention.

Fig. 11 is a schematic plan view of a seventh embodiment of the groove structure of the magnetic cover of the speaker of the present invention.

Fig. 12 is a schematic plan view of an eighth embodiment of the groove structure of the magnetic cover of the speaker of the present invention.

Fig. 13 is a schematic plan view of a ninth embodiment of the groove structure of the magnetic cover of the speaker of the present invention.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. One or more embodiments of the present invention are illustrated in the accompanying drawings to provide a more accurate and thorough understanding of the disclosed embodiments. It should be understood, however, that the present invention may be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein.

As shown in fig. 1, the speaker of the present invention includes a vibration component 10 and a magnetic circuit component 30, wherein the magnetic circuit component 30 is used for providing an electromagnetic driving force for the vibration component 10.

Referring to fig. 2, the magnetic circuit assembly 30 includes a magnetic steel 32, a magnetic cover 34, and an adhesive layer 36 for adhering the magnetic steel 32 and the magnetic cover 34. In the illustration, the magnetic circuit assembly 30 is a single magnetic circuit structure, that is, the magnetic steel 32 is single. The magnetic shield 34 is radially spaced from the magnetic steel 32 to form a magnetic gap 33 therebetween. The vibration assembly 10 includes a diaphragm 12 and a voice coil 14 connected to an edge of the diaphragm 12, and an end of the voice coil 14 is inserted into a magnetic gap 33 of the magnetic circuit assembly 30. When the audio current passes through the voice coil 14, a magnetic field changing along with the audio current is generated, and the changing magnetic field formed by the voice coil 14 and the magnetic field of the magnetic steel 32 act to make the voice coil 14 vibrate along the axial direction thereof, so as to drive the vibrating diaphragm 12 connected with the voice coil 14 to vibrate, so as to push the air to move to generate sound, thereby realizing electro-acoustic conversion.

In the embodiment shown in fig. 2, the magnetic steel 32 is cylindrical, and a magnetically conductive pole piece 39 is disposed on the top. The magnetic cover 34 is generally flat and includes an upper surface and a lower surface opposite to each other, wherein the upper surface serves as a mounting surface 340 for carrying the magnetic steel 32. The center of the mounting surface 340, i.e. the position corresponding to the magnetic steel 32, is recessed to form a groove structure 38 for bearing an adhesive, such as glue, for bonding the magnetic cover 34 and the magnetic steel 32, and the adhesive layer 36 is formed after the adhesive is cured. The edge of the magnetic cover 34 extends towards the side where the magnetic steel 32 is located to form a side plate 342, and the side plate 342 and the magnetic steel 32 are arranged at an interval and form the magnetic gap 33 therebetween. It should be understood that the magnetic circuit assembly 30 is not limited to a single magnetic circuit structure, but may be a double magnetic circuit structure, a three magnetic circuit structure, a four magnetic circuit structure, a five magnetic circuit structure, etc., that is, the number of the magnetic steels may be multiple, and is generally divided into a central magnetic steel and a side magnetic steel according to the position.

When the magnetic circuit component is of a double-magnetic circuit structure, the number of the magnetic steels is two, and the magnetic steels are composed of central magnetic steels and annular edge magnetic steels arranged around the central magnetic steels. At the moment, the central magnetic steel is arranged in the center of the magnetic cover, the edge magnetic steel is arranged close to the edge of the magnetic cover, and the central magnetic steel and the edge magnetic steel are spaced at intervals to form a magnetic gap. Similarly, the center magnet steel and the side magnet steel can be provided with the magnetic pole pieces. When the magnetic circuit component is of a three-magnetic-circuit structure, the number of the magnetic steels is three, and the magnetic circuit component is composed of a central magnetic steel and two side magnetic steels respectively arranged at two opposite sides of the central magnetic steel. At the moment, the central magnetic steel is arranged in the center of the magnetic cover, the two side magnetic steels are respectively arranged close to the two opposite sides of the magnetic cover, and the central magnetic steel and the side magnetic steels are spaced at intervals to form a magnetic gap. Similarly, the central magnetic steel and the two side magnetic steels can be provided with magnetic conductive pole pieces. For avoiding redundancy, the present invention does not describe other magnetic circuit structures.

As shown in fig. 2 and 3, the trench structure 38 includes a plurality of first trenches 40 and a plurality of spacers 44. The first grooves 40 alternate with the spaces 44 in a circumferential direction.

Each first groove 40 extends radially outwardly from the center of groove structure 38, and each first groove 40 includes a radially inner end and a radially outer end. Each first groove 40 is surrounded by a first side 401 and a second side 403 opposite in the circumferential direction, and a third side 405 and a fourth side 407 opposite in the radial direction. The first side 401 and the second side 403 are both curved sides and have the same bending direction, and both are arched clockwise as shown in fig. 3; the third side 405 is connected between the radially outer ends of the first side 401 and the second side 403, the fourth side 407 is connected between the radially inner ends of the first side 401 and the second side 403, and the length of the third side 405 is greater than the length of the fourth side 407. Overall, the first recess 40 is generally triangular or fan-shaped.

The circumferential width of the first groove 40, i.e. the circumferential spacing width between the first side 401 and the second side 403, increases from the radially inner end towards the radially outer end of the first groove 40, i.e. from the central outward edge of the groove structure 38. As shown in fig. 3, the first side 401 has a different curvature than the second side 403, preferably the second side has a curvature 3-8 times greater than the first side. In the illustration, the equation for the curve for the first side is y = x ^ 1/2; the equation for the second side is y = x ^ 3. It should be understood that in other embodiments, the curvature of the first side 401 may be greater than the curvature of the second side 403. By the curved design of the first side 401 and the second side 403, the overall shape of the groove structure 38 is similar to that of an impeller, and the shape of the first groove 40 is similar to that of a blade.

Each spacer 44 also extends radially outwardly from the center of the groove structure 38, each spacer 44 including a radially inner end and a radially outer end. The spacers 44 are likewise generally triangular or scalloped, with a circumferential width that is narrower nearer its radially inner end and wider nearer its radially outer end. The radially inner ends of the respective spacers 44 are integrally connected to each other to space apart the radially outer ends of the respective first grooves 40. The spacers 44 can disperse the impact, and the total area of the spacers 44 is much smaller than the total area of the groove structures 38, preferably, the ratio of the total area of the spacers 44 to the total area of the groove structures 38 is 1/8-1/4, so that the adhesion effect is prevented from being affected due to the fact that the bonding area of the magnetic steel 32 and the magnetic shield 34 is too small because the area of the spacers 44 is too large, and the impact dispersion effect is also prevented from being inconspicuous because the area of the spacers 44 is too small.

When the magnetic cover 34 is assembled with the magnetic steel 32, the adhesive is poured into each first groove 40 of the groove structure 38, and the adhesive in each first groove 40 forms one segment 50 of the adhesive layer 36 after being cured. As shown in fig. 4, the individual segments 50 of the adhesive layer 36 are circumferentially spaced apart, and the circumferential width of each segment 50 increases from the inside to the outside, i.e., the segments 50 become narrower toward the center of the adhesive layer 36 and wider toward the outer edge of the adhesive layer 36. The adhesive layer 36 is relatively more impacted at its outer edge when impacted, with the wider the outer edge of the individual pieces 50 of the adhesive layer 36, the lower the average impact force per unit area. Meanwhile, the width of the segment 50 of the bonding layer 36 is gradually changed, so that the original shearing effect can be effectively converted into the extrusion effect, the shearing risk of the bonding layer 36 is reduced, the shearing stress of the bonding layer 36 is reduced, and the magnetic steel 32 is prevented from falling off from the magnetic cover 34 due to the fragmentation of the bonding layer 36.

In addition, corresponding to the first side 401 and the second side 403 of the first groove 40, the circumferential sides of the segments 50 of the adhesive layer 36 are curved, so that the stress directions at the edges of the segments 50 are different when the segments are impacted, the stress can be reduced to a certain extent, the effect of reducing the shear stress of the adhesive layer 36 is further achieved, and the adhesive layer is prevented from being broken. It should be understood that the shape, structure, size, etc. of the groove structure 38 or the adhesive layer 36 may be varied according to the actual application environment, and are not limited to the specific embodiments described above.

As shown in fig. 5, in the second embodiment of the speaker of the present invention, the recess structure 38a of the magnetic cover 34a further includes second recesses 42a, and the second recesses 42a are integrally connected to the respective first recesses 40 a. At this time, the second grooves 42a are located at the center of the magnetic shield 34a, and the first grooves 40a and the spacers 44a are circumferentially arranged around the second grooves 42a and alternately distributed. Each first groove 40a extends radially outwardly from a second groove 42a, with the radially inner end of each first groove 40a communicating with the second groove 42a to space the radially inner ends of adjacent spacers 44 a. The second groove 42a is preferably circular with a radius 3-6 times the depth of the first groove 40a and a depth greater than the depth of the first groove 40 a. Preferably, the depth of the second groove 42a is 2 to 4 times the depth of the first groove 40 a.

As shown in fig. 6, the adhesive layer 36a is formed to include a plurality of divided pieces 50a and a central portion 52a integrally connecting the respective divided pieces 50a, corresponding to the groove structure 38 a. The adhesive poured into each first groove 40a is cured to form one of the segments 50a, and the adhesive poured into the second groove 42a is cured to form the central portion 52 a. The individual segments 50a are integrally connected to the central portion 52a, and the adhesive layer 36a is integrally connected in a segmented configuration. Preferably, the thickness of the central portion 52a of the adhesive layer 36a is 2 to 4 times of the thickness of each peripheral piece 50 a. Preferably, the radially inner end of the spacer region 44a, i.e., the end associated with the second groove 42a, is rounded to the depth of the first groove 40a to reduce abrupt cross-sectional changes at the junction of the segment 50a of the adhesive layer 36a and the central portion 52 a.

In the embodiment, when the adhesive layer 36a is impacted, the original shearing effect is converted into the extrusion effect through the width change of the segment 50a, so that the shearing risk of the adhesive layer 36a is reduced; meanwhile, the thicker central portion 52a provides a spring-like effect, so that the impact on the magnetic shield can be effectively buffered, the shear stress of the adhesive layer 36a can be further reduced, the adhesive layer 36a can be prevented from being broken when impacted, and the effectiveness of adhering the magnetic shield 34a and the magnetic steel 32 can be ensured.

In the first and second embodiments shown in fig. 2 and 5, the groove structures 38, 38a are generally circular, and the third side 405 of each first groove 40 is a circular arc, which is a portion of a circular edge line (shown by a dotted line in fig. 3), and preferably matches the circular magnetic shield. It will be appreciated that the recess structure as a whole may accordingly have different shapes, depending on the shape of the magnetic shield. In a third embodiment of the loudspeaker according to the invention shown in fig. 7, the groove structure 38b is square as a whole, preferably with a side length L1 of the square being 6-8 times the depth of the first groove 40b of the groove structure 38 b. At this time, the third side 405b of each first groove 40b is a straight side, which is a part of a square edge line (shown by a dotted line in fig. 7). In a fourth embodiment of the loudspeaker according to the invention, shown in fig. 8, the recess structure 38c is rectangular overall, preferably with the long side L2 of the rectangle being 6-9 times the depth of the first recess 40c of the recess structure 38 c. At this time, the third side 405c of each first groove 40c is a straight side, which is a part of a rectangular edge line (shown by a dotted line in fig. 8). The square or rectangular groove structures 38b, 38c may match the square magnetic shield.

In the above embodiments, the first side and the second side of the first groove 40-40 c are curved sides. It should be understood that the first and second sides are not limited to curved sides.

As shown in fig. 9, in the fifth embodiment of the speaker of the present invention, the first side 401d and the second side 403d of the first groove 40d of the groove structure 38d are both straight sides, and the slopes of the two sides are different and form a certain angle with each other. The circumferential width of the first groove 40d, that is, the circumferential interval width between the first side 401d and the second side 403d, gradually increases from inside to outside; correspondingly, the circumferential width of the spacer 44d gradually increases from the inside to the outside. Corresponding to 40d of the first groove, both circumferential sides of each of the divided pieces of the adhesive layer are linear sides, and the circumferential width of the divided piece becomes narrower as it approaches the center of the adhesive layer and wider as it approaches the outer edge of the adhesive layer. When the adhesive layer is impacted, the width change of the adhesive layer can also form an extrusion effect, so that the shear stress of the adhesive layer is reduced, and the adhesive layer is prevented from being cracked.

In a sixth embodiment of the loudspeaker according to the present invention as shown in fig. 10, the first side 401e of the first recess 40e of the recess structure 38e is a curved side and the second side 403e is a straight side. The circumferential width of the first groove 40e, that is, the circumferential interval width between the first side 401e and the second side 403e, gradually increases from inside to outside; correspondingly, the circumferential width of the spacer region 44e gradually increases from the inside to the outside. Of course, the first side 401e of the first groove may be a straight side, and the second side 403e may be a curved side. Corresponding to the 40e of the first groove, one side of each of the circumferential both sides of the formed adhesive layer is a curved side and one side is a linear side, and the circumferential width of the segment becomes narrower as it approaches the center of the adhesive layer and wider as it approaches the outer edge of the adhesive layer. When the adhesive layer is impacted, the width change of the segments can form an extrusion effect to reduce the shear stress of the adhesive layer, and meanwhile, the bent side edges can reduce the stress, so that the adhesive layer is effectively prevented from being cracked.

In the above embodiments, the change in width of the adhesive layer segments provides a squeezing effect, reducing shear stress generated upon impact. It should be understood that the circumferential width of the first groove may also be constant. In the seventh embodiment of the speaker of the present invention as shown in fig. 11, the first groove 40f of the groove structure 38f is a part of a circular ring, and the first side 401f and the second side 403f have the same curvature, are parallel and have a constant spacing width. In the eighth embodiment of the speaker of the present invention shown in fig. 12, the first groove 40g of the groove structure 38g is also a part of a circular ring, and a second groove 42g is formed in the center of the groove structure 38g, and the first groove 40g is disposed around the second groove 42g and is communicated with the second groove 42 g. Because the first grooves 40f and 40g are part of the circular ring, the first sides 401f and 401g and the second sides 403f and 403g are both curved sides, and the two circumferential sides of the correspondingly formed bonding layer sheet are of a bent structure, the stress directions at the two side edges of the sheet are different when the sheet is impacted, and the stress is mutually reduced to a certain extent so as to reduce the shear stress effect of the bonding layer and avoid the cracking of the bonding layer.

In the above embodiments, the first grooves are either distributed discretely or are communicated with each other through the second grooves. It should be understood that the first grooves may also be directly connected, and as shown in fig. 13, in the ninth embodiment of the loudspeaker according to the present invention, the groove structure 38h is formed by a plurality of first grooves 40h, each first groove 40h includes a radially inner end and a radially outer end, the radially inner ends of adjacent first grooves 40h are integrally connected, and the radially outer ends are separated from each other to form the spacing area 44 h. The first grooves 40h and the spacers 44h are fan-shaped, and the circumferential width gradually increases from inside to outside. Accordingly, the radially inner ends of the individual segments of the adhesive layer formed are integrally connected, and the adhesive layer may have a better deformability. Of course, the groove structure of the speaker of the present invention may have various structures, shapes, etc., and is not limited to the specific embodiment.

The magnetic cover 34 of the loudspeaker is provided with the groove structure 38 for bearing adhesive, the groove structure 38 comprises a plurality of first grooves 40 distributed along the circumferential direction, and the distributed design of the first grooves 40 avoids the risk of over-low bending rigidity of the magnetic cover 34 and the risk of impact instability in a certain direction. The adhesive layer 36 formed corresponding to the plurality of first grooves 40 of the groove structure 38 includes a plurality of circumferentially distributed segments 50, and each segment 50 converts an original shearing effect into a squeezing effect when the adhesive layer 36 is impacted, thereby reducing the shearing risk thereof. The groove structure 38 can also comprise a central part 52 which is integrally connected with each segment 50, so that the deformation difference between the magnetic cover 34 and the magnetic steel 32 is reduced and the tensile stress of the bonding layer 36 is reduced when the loudspeaker falls in the positive direction; when the speaker falls in the side direction, each burst 50 that tie coat 36 interconnect extrudes each other to the effect of the bigger formation spring of thickness of the central part 52 of tie coat 36 effectively cushions the impact that receives, reduces the shear stress of tie coat 36, avoids tie coat 36 cracked, guarantees to magnet steel 32 and the sticky validity of magnetic shield 34, and magnet steel 32 drops from magnetic shield 34 when avoiding receiving the impact, causes the speaker impaired.

Preferably, the surfaces of the magnetic shield 34, particularly the mounting surface 340, are plated with a dense metal coating to eliminate surface burrs. The material of the metal plating layer is preferably an inert metal such as nickel or the like. The thickness of the metal coating is preferably between 5 and 10 microns, and the coating with too small a thickness cannot completely eliminate burrs on the surface of the magnetic shield 34; too large a thickness of the plating layer results in long process cycle and low cost performance. When the magnetic cover 34 is not plated, the bonding surface with the bonding layer 36 has a lot of burrs, and the surface burrs have a large stress concentration coefficient, and are easy to fail and damage due to large stress during impact. After the magnetic cover 34 is plated, the surface becomes compact and smooth, the bonding layer 36 occupies a smaller volume and is adsorbed on the compact plating layer (forming a chemical bond), when the magnetic cover is impacted by the same external force, the area of the bonding layer 36 participating in deformation is increased, the integral rigidity is reduced, and the damaged shearing force can be reduced by about 100N compared with the non-plated layer. In addition, the bending rigidity of the magnetic cover 34 is increased after coating, the deformation under impact is also reduced, the force transmitted to the bonding layer 36 is further reduced, and the cracking failure of the bonding layer 36 is further avoided.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and other changes and modifications can be made by those skilled in the art according to the spirit of the present invention, and these changes and modifications made according to the spirit of the present invention should be included in the scope of the present invention as claimed.

Claims (13)

1. The utility model provides a loudspeaker, includes vibration subassembly and drive the magnetic circuit subassembly of vibration subassembly, magnetic circuit subassembly includes magnet steel, magnetism cover and bonds the adhesive linkage of magnet steel and magnetism cover, the magnetism cover includes the orientation the fitting surface of magnet steel, its characterized in that: a groove structure facing the magnetic steel is formed on the assembling surface of the magnetic cover, the groove structure comprises a plurality of first grooves which are distributed at intervals along the circumferential direction, each first groove comprises a radial inner end and a radial outer end, and the radial outer ends of two adjacent first grooves are spaced; the adhesive layer comprises a plurality of fragments which are respectively positioned in the first grooves, the radial outer ends of the fragments are mutually spaced, and the radial inner ends of the fragments are integrally connected.

2. The loudspeaker of claim 1, wherein said first recess includes circumferentially opposite first and second sides, said first and second sides being circumferentially spaced apart from each other by a width that decreases from a radially outer end to a radially inner end of said first recess, said segments increasing in circumferential width from a radially inner end to a radially outer end thereof.

3. The loudspeaker of claim 1, wherein the first groove includes circumferentially opposing first and second sides, each of the first and second sides being curved, the first groove being circumferentially spaced apart from one another by a width that is constant from a radially outer end to a radially inner end of the first groove.

4. The loudspeaker of claim 2, wherein the first side and the second side are both straight sides; or both the first side edge and the second side edge are curved edges; or one of the first side edge and the second side edge is a straight side, and the other side edge is a curved side.

5. The loudspeaker of claim 4 wherein said first and second sides are curved sides, said first and second sides being curved in a direction, said second side having a curvature that is 3-8 times the curvature of said first side.

6. The speaker of claim 5, wherein the curve equation for the first side is y = x ^ 1/2; the curve equation of the second side edge is y = x ^ 3.

7. The loudspeaker according to any of claims 2-6, wherein the first groove further comprises a third side connected between the radially outer ends of the first and second sides, the groove structure being generally circular, the third side of the plurality of first grooves being a portion of a circular edge line, the radius of the circle being 3-6 times the depth of the first groove; or the whole groove structure is square, the third side edges of the first grooves are part of square edge lines, and the side length of the square edge lines is 6-9 times of the depth of the first grooves.

8. The speaker according to any one of claims 1 to 6, wherein the groove structure further comprises a spacer formed between adjacent two of the first grooves, and a circumferential width of the spacer is gradually increased from inside to outside in a radial direction.

9. The loudspeaker of claim 8 wherein the ratio of the total area of the spacers to the total area of the groove structures is 1/8-1/4.

10. The loudspeaker of any one of claims 1 to 6, wherein the groove structure further comprises a second groove surrounded by the first grooves, a radially inner end of each of the first grooves communicating with the second groove, and radially inner ends of adjacent two of the first grooves communicating through the second groove; the adhesive layer further comprises a central part positioned in the second groove, and the central part is integrally connected with the radial inner ends of the plurality of the slicing pieces.

11. The loudspeaker of claim 10 wherein said groove structure further comprises spacers formed between two adjacent first grooves, each spacer being rounded at an end connected to said second groove, the rounded angle being the depth of said first groove.

12. The loudspeaker of claim 10, wherein the depth of the second groove is 2-4 times the depth of the first groove, and the thickness of the center portion is 2-4 times the thickness of the segment.

13. The loudspeaker of claim 1, wherein the upper surface of the magnetic shield is plated with a metal coating having a thickness of 5-10 microns.

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