Waterproof diaphragm assembly matched with thin voice coil

Abstract

The invention provides a waterproof vibrating diaphragm assembly matched with a thin voice coil, which is used for combining a magnetic loop assembly and a thin voice coil assembly, the waterproof vibrating diaphragm assembly is combined with the magnetic loop assembly, the thin voice coil assembly is combined with the waterproof vibrating diaphragm assembly, and the waterproof vibrating diaphragm assembly comprises a waterproof vibrating diaphragm, a vibrating diaphragm bracket and an annular gasket. The waterproof vibrating diaphragm is provided with a long edge embedding surface; the vibrating diaphragm support is combined with the waterproof vibrating diaphragm, the vibrating diaphragm support is provided with a long-edge embedding flange, the long-edge embedding flange is correspondingly arranged on one side of the long-edge embedding surface, and the long-edge embedding flange of the vibrating diaphragm support is matched with the long-edge embedding surface of the waterproof vibrating diaphragm to be combined with the magnetic loop assembly; the annular gasket is arranged at the bottom of the waterproof diaphragm, and the bottom of the annular gasket is combined with the thin voice coil assembly. Therefore, the waterproof vibrating diaphragm assembly can provide free operation space for the waterproof vibrating diaphragm through the annular gasket, so that the efficiency, the tone quality and the volume of the thin waterproof loudspeaker are improved.

Description

Technical Field

[0001] The present invention provides a waterproof diaphragm assembly that works with a thin voice coil, particularly one that uses an annular spacer to provide free operating space for the waterproof diaphragm, thereby improving the efficiency, sound quality and volume of a thin waterproof loudspeaker. Background Technology

[0002] Conventional loudspeaker diaphragms typically protrude outwards from the top to increase the operating space of the diaphragm relative to the magnetoresistance assembly. However, this protruding top of the conventional diaphragm is prone to interference with external objects, especially when the loudspeaker is mounted on a thin electronic device.

[0003] Therefore, the goal is to invent a waterproof diaphragm assembly that works with a thin voice coil, so that the annular gasket can provide the waterproof diaphragm with free space to operate, thereby improving the efficiency, sound quality and volume of the thin waterproof speaker. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the inventor felt that it was not perfect, so he devoted his mind to research and overcoming it, and developed a waterproof diaphragm assembly that works with a thin voice coil, in order to provide the waterproof diaphragm with free space for operation through the ring-shaped gasket, thereby improving the efficiency, sound quality and volume of the thin waterproof speaker.

[0005] To achieve the above and other objectives, the present invention provides a waterproof diaphragm assembly in conjunction with a thin voice coil, which is used to combine a magnetic return assembly and a thin voice coil assembly. The waterproof diaphragm assembly is combined with the magnetic return assembly, and the thin voice coil assembly is combined with the waterproof diaphragm assembly. The waterproof diaphragm assembly includes: a waterproof diaphragm, a diaphragm support, and an annular gasket. The waterproof diaphragm has a long-side interlocking surface on each of its two bottom sides. The diaphragm support is combined with the waterproof diaphragm, and the diaphragm support has a long-side interlocking flange on each of its two bottom sides. Each long-side interlocking flange is located on one side of each long-side interlocking surface. The long-side interlocking flanges of the diaphragm support cooperate with the long-side interlocking surfaces of the waterproof diaphragm for assembly with the magnetic return assembly. The annular gasket is located at the bottom of the waterproof diaphragm, and the bottom of the annular gasket is used to assemble with a thin voice coil of the thin voice coil assembly so that the thin voice coil aligns with a dominant magnetic plate of the magnetic return assembly. The thin voice coil is located in a magnetic gap between the dominant magnetic plate and a magnetic yoke of the magnetic return assembly, and the inner periphery of the thin voice coil is adjacent to the outer periphery of the dominant magnetic plate.

[0006] In the aforementioned waterproof diaphragm assembly, a short-side fitting surface is provided on each of the other two sides of the bottom of the waterproof diaphragm, and a short-side fitting flange is provided on each of the other two sides of the bottom of the diaphragm bracket. Each short-side fitting flange is correspondingly located on one side of each short-side fitting surface. Each short-side fitting flange of the diaphragm bracket cooperates with each short-side fitting surface of the waterproof diaphragm for assembly into the magnetic return assembly.

[0007] In the aforementioned waterproof diaphragm assembly, the top of the diaphragm support has an annular interlocking flange for attaching to the waterproof diaphragm.

[0008] In the aforementioned waterproof diaphragm assembly, the annular gasket has an annular foam body and two annular sheets. The annular foam body is disposed between the annular sheets, one of the annular sheets is disposed at the bottom of the waterproof diaphragm, and the other two annular sheets are used to be combined with the thin voice coil of the thin voice coil assembly.

[0009] In the aforementioned waterproof diaphragm assembly, the material of the annular foam is polymethacrylimide polymer foam, and each annular sheet is an annular aluminum foil sheet.

[0010] In the aforementioned waterproof diaphragm assembly, the thickness of the annular foam is greater than the sum of the thicknesses of the individual annular sheets.

[0011] In the aforementioned waterproof diaphragm assembly, the thickness of the annular foam is more than twice the sum of the thicknesses of all the annular sheets.

[0012] In the aforementioned waterproof diaphragm assembly, the annular gasket is a metal frame, and the top of the annular gasket has two long-side connecting flanges and two short-side connecting flanges to connect to the bottom of the waterproof diaphragm.

[0013] In the aforementioned waterproof diaphragm assembly, the metal frame is made of aluminum alloy or stainless steel.

[0014] The aforementioned waterproof diaphragm assembly also includes a planar dome, which is disposed at the bottom of the waterproof diaphragm, and the bottom of the planar dome is connected to the annular gasket.

[0015] In the aforementioned waterproof diaphragm assembly, the horizontal center of the thin voice coil is at the same horizontal height as the horizontal center of the main magnetic plate.

[0016] In the aforementioned waterproof diaphragm assembly, the thin voice coil at the bottom of the annular gasket is positioned above a secondary magnet of the magnetic return assembly, and at least half of the projected area of ​​the thin voice coil overlaps with the secondary magnet.

[0017] Therefore, the waterproof diaphragm assembly of the present invention, which is equipped with a thin voice coil, can provide the waterproof diaphragm with free operating space through an annular gasket, thereby improving the efficiency, sound quality and volume of the thin waterproof speaker. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the appearance of the first embodiment of the present invention.

[0019] Figure 2 This is an exploded view of the first embodiment of the present invention.

[0020] Figure 3This is a cross-sectional view of the first embodiment of the present invention. Figure 1 .

[0021] Figure 4 This is a cross-sectional view of the first embodiment of the present invention. Figure 2 .

[0022] Figure 5 This is an exploded view of the second embodiment of the present invention.

[0023] Figure 6 This is a cross-sectional schematic diagram of the second embodiment of the present invention.

[0024] Figure 7 This is a cross-sectional schematic diagram of the third embodiment of the present invention.

[0025] Figure 8 This is a cross-sectional schematic diagram of the fourth embodiment of the present invention.

[0026] Figure Labels

[0027] 1. Magnetic return assembly

[0028] 11. Magnetic yoke

[0029] 111 Base Plate

[0030] 112 Long side

[0031] 1121 Side magnet

[0032] 1122 Side magnetic guide plate

[0033] 113 Short side

[0034] 114 Diaphragm Fitting Groove

[0035] 115 sets of joints

[0036] 116 First vent

[0037] 117 Second vent

[0038] 12 main magnet units

[0039] 121 Main Magnet

[0040] 122 Main magnetic plate

[0041] 13 pairs of magnets

[0042] 131 Annular flange

[0043] 14 Magnetic gap

[0044] 2 Thin voice coil assembly

[0045] 21 Thin voice coil

[0046] 211 Short side

[0047] 22 Spirals

[0048] 221 Thin voice coil mating section

[0049] 222 Fixing part

[0050] 223 Flexible Arm

[0051] 224 Electrical Contacts

[0052] 3 Waterproof diaphragm assembly

[0053] 31 Waterproof diaphragm

[0054] 311 Long side interlocking surface

[0055] 312 Short-side mating surface

[0056] 32 Planar Dome

[0057] 33 Diaphragm support

[0058] 331 Long-side interlocking flange

[0059] 332 Short-side interlocking flange

[0060] 333 Ring-shaped interlocking flange

[0061] 4. Ring gaskets

[0062] 41. Ring-shaped foam

[0063] 42 Ring-shaped sheet

[0064] 43 Long side connecting flange

[0065] 44 Short-side connecting flange Detailed Implementation

[0066] To fully understand the purpose, features, and effects of the present invention, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0067] Please refer to Figures 1 to 4 As shown in the figure, the present invention provides a waterproof diaphragm assembly 3 that works with a thin voice coil 21, which can be used to combine a magnetic return assembly 1 and a thin voice coil assembly 2 to form a thin waterproof loudspeaker. The waterproof diaphragm assembly 3, the thin voice coil 21, the magnetic return assembly 1, and the thin waterproof loudspeaker may be roughly rectangular. The waterproof diaphragm assembly 3 is attached to the magnetic return assembly 1, and the thin voice coil assembly 2 is attached to the waterproof diaphragm assembly 3.

[0068] The waterproof diaphragm assembly 3 includes a waterproof diaphragm 31, a diaphragm support 33, and an annular gasket 4. The waterproof diaphragm 31 has a long-side fitting surface 311 on each side of its bottom. The diaphragm support 33 is combined with the waterproof diaphragm 31. The diaphragm support 33 has a long-side fitting flange 331 on each side of its bottom. Each long-side fitting flange 331 is located on one side of each long-side fitting surface 311. The long-side fitting flanges 331 of the diaphragm support 33 cooperate with the long-side fitting surfaces 311 of the waterproof diaphragm 31 to form two fitting grooves for assembly into the two diaphragm fitting grooves 114 of the magnetic return assembly 1. The annular gasket 4 is located at the bottom of the waterproof diaphragm 31. The bottom of the annular gasket 4 is used to assemble into a thin voice coil 21 of the thin voice coil assembly 2, so that the thin voice coil 21 can align with a main magnetic plate 122 of the magnetic return assembly 1 to improve magnetic conductivity. Furthermore, the thin voice coil 21 is disposed in a magnetic gap 14 between the main magnetic plate 122 and a magnetic yoke 11 of the magnetic return assembly 1, with the inner periphery of the thin voice coil 21 adjacent to the outer periphery of the main magnetic plate 122. Moreover, the hollow annular gasket 4 avoids a main magnet unit 12 of the magnetic return assembly 1, providing free operating space for the waterproof diaphragm 31. Furthermore, the annular gasket 4 is used to connect the bottom surface of the waterproof diaphragm 31 to the top surface of the thin voice coil 21, and the height of the annular gasket 4 depends on the position where the maximum electromagnetic force is generated between the thin voice coil 21 and the main magnetic plate 122. Furthermore, the horizontal center of the thin voice coil 21 is approximately at the same horizontal height as the horizontal center of the main magnetic plate 122, so as to ensure that the main magnetic plate 122 can provide the maximum magnetic force to the thin voice coil 21, thereby generating the maximum electromagnetic force, so that the thin voice coil 21 can achieve the maximum displacement after being subjected to force, thereby achieving a larger volume and better sound quality.

[0069] As described above, the waterproof diaphragm assembly 3 of the present invention, which is equipped with a thin voice coil 21, can be easily assembled into the diaphragm mounting slots 114 of the magnetic return assembly 1 by utilizing the mounting slots formed by the long side mounting flanges 331 and the long side mounting surfaces 311, thereby improving the assembly yield of the thin waterproof loudspeaker.

[0070] The bottom of the aforementioned waterproof diaphragm 31 may be provided with a short-side fitting surface 312 on each of its other two sides, and the bottom of the diaphragm support 33 may be provided with a short-side fitting flange 332 on each of its other two sides. Each short-side fitting flange 332 is correspondingly located on one side of each short-side fitting surface 312. The short-side fitting flanges 332 of the diaphragm support 33 cooperate with the short-side fitting surfaces 312 of the waterproof diaphragm 31 to form two fitting grooves for assembly into the two sets of flanges 115 of the magnetic return assembly 1, respectively. In this way, the waterproof diaphragm assembly 3 of the present invention, which is coupled with the thin voice coil 21, can be easily assembled into the sets of flanges 115 of the magnetic return assembly 1 by utilizing the fitting grooves formed by the short-side fitting flanges 332 and the short-side fitting surfaces 312, thereby improving the assembly yield of the thin waterproof loudspeaker. In addition, the top of the diaphragm support 33 may have an annular interlocking flange 333 to be attached to the waterproof diaphragm 31, so as to improve the bonding strength between the diaphragm support 33 and the waterproof diaphragm 31.

[0071] The aforementioned annular gasket 4 may have an annular foam body 41 and two annular sheets 42. The annular foam body 41 is disposed between the annular sheets 42, one of the annular sheets 42 is disposed at the bottom of the waterproof diaphragm 31, and the other two annular sheets 42 are used to assemble with the thin voice coil 21 of the thin voice coil assembly 2. In this way, the annular foam body 41 can have high strength and reduce the weight of the annular gasket 4, and the annular sheets 42 can further enhance the strength of the annular gasket 4. In addition, the waterproof diaphragm assembly 3 may include the waterproof diaphragm 31 and the diaphragm support 33, and may also include a planar dome 32. The waterproof diaphragm 31 and the diaphragm support 33 can be integrally injection molded, or the waterproof diaphragm 31, the planar dome 32 and the diaphragm support 33 can be integrally injection molded. The planar dome 32 can be assembled at the bottom of the waterproof diaphragm 31, and the annular gasket 4 can be attached to the bottom of the planar dome 32. The thin voice coil assembly 2 can have a thin voice coil 21 and two spiders 22. Each spider 22 can be assembled at the bottom of the two symmetrical short side portions 211 of the thin voice coil 21. The thin voice coil 21 can be assembled at the bottom of the annular gasket 4 to combine with the waterproof diaphragm 31 and the planar dome 32.

[0072] In the aforementioned annular gasket 4, the annular foam 41 can be made of polymethacrylimide (PMI) polymer foam, and each annular sheet 42 can be an annular aluminum foil sheet. The thickness of the annular foam 41 can be greater than the sum of the thicknesses of all the annular sheets 42. In a preferred embodiment, the thickness of the annular foam 41 can be more than twice the sum of the thicknesses of all the annular sheets 42 (i.e., the thickness of the annular foam 41 ≥ the sum of the thicknesses of all the annular sheets 42 x 2), thus achieving an optimal combination of weight and strength for the annular gasket 4. In addition to the aforementioned annular gasket 4, the annular foam 41 can also be made of MCPET foam material, and the upper and lower annular sheets 42 need to be made of materials with a certain strength and able to withstand the high temperature of the thin voice coil 21. Therefore, each annular sheet 42 can be composed of other metals (such as titanium) or non-metallic inorganic materials (such as graphite).

[0073] Furthermore, since the annular foam 41 of the annular gasket 4 is made of foam material, its lighter weight can improve the volume of the thin waterproof speaker, and it also has the characteristics of temperature resistance and high strength, making the waterproof diaphragm assembly 3 less prone to deformation under stress. Moreover, the top and bottom surfaces of the annular foam 41 are respectively fitted with the annular aluminum foil sheet, and the annular gasket 4 can form a sandwich structure. The annular aluminum foil sheet on the top surface is attached to the bottom of the planar dome 32, and the annular aluminum foil sheet on the bottom surface is attached to the top surface of the thin voice coil 21. This not only increases the structural strength of the annular gasket 4, but also helps to dissipate heat from the thin voice coil 21.

[0074] The purpose of the aforementioned annular gasket 4 is primarily to provide a certain height to accommodate the magnetic return assembly 1 within a limited height, and to provide free operating space for the waterproof diaphragm 31. This prevents the waterproof diaphragm 31 from striking the magnetic return assembly 1 and producing abnormal noise during operation. Secondly, it also prevents the high temperature generated by the thin voice coil 21 during operation from being directly transferred to the waterproof diaphragm 31, which would cause the structure of the polymer-based waterproof diaphragm 31 and the planar dome 32 to soften due to heat, resulting in changes in the characteristics of the waterproof diaphragm 31 and the planar dome 32.

[0075] The aforementioned magnetic return assembly 1 may include a magnetic yoke 11 and a main magnet unit 12. The magnetic yoke 11 may include a base plate portion 111, two long side portions 112, two short side portions 113, two diaphragm mounting slots 114, and two assembly flanges 115. Each long side portion 112 may be symmetrically arranged on the two long side sides of the base plate portion 111, and each short side portion 113 may be symmetrically arranged on the two short side sides of the base plate portion 111. Each diaphragm mounting slot 114 may be disposed on the inner side of the top of each long side portion 112 for mounting the waterproof diaphragm assembly 3. The waterproof diaphragm assembly 3 may have two mounting slots formed by the two long side mounting flanges 331 of the diaphragm support 33 engaging with the two long side mounting surfaces 311 of the waterproof diaphragm 31 to respectively assemble into the diaphragm mounting slots 114 of the magnetic return assembly 1. In addition, each set of flanges 115 can be provided on the inner side of the top of each short side portion 113 for fitting the waterproof diaphragm assembly 3. The waterproof diaphragm assembly 3 can be fitted with the two short side fitting flanges 332 of the diaphragm bracket 33 and the two short side fitting surfaces 312 of the bottom of the waterproof diaphragm 31 to form two fitting grooves to be respectively combined with each set of flanges 115. Thus, when the waterproof diaphragm assembly 3 is combined with the magnetic return assembly 1, the two long-side fitting flanges 331 of the diaphragm bracket 33 can cooperate with the two long-side fitting surfaces 311 of the waterproof diaphragm 31 to form two fitting grooves respectively, which are respectively set in each diaphragm fitting groove 114 (assembly step). The two short-side fitting flanges 332 of the diaphragm bracket 33 cooperate with the two short-side fitting surfaces 312 of the waterproof diaphragm 31 to form two fitting grooves respectively, which are respectively set in the two assembly flanges 115 of each short side portion 113 of the magnetic yoke 11. This solves the positioning problem between the waterproof diaphragm assembly 3 and the magnetic return assembly 1, thereby facilitating the assembly and combination of the two, making it easier to assemble the waterproof diaphragm assembly 3 into the magnetic return assembly 1, and thus improving the assembly yield of the thin waterproof speaker.

[0076] The aforementioned main magnet unit 12 can be disposed on the base plate portion 111 of the magnetic yoke 11, and the base plate portion 111 protrudes beyond the lateral periphery of the main magnet unit 12. The main magnet unit 12 may include a main magnet 121 and a main magnetic plate 122. The main magnet 121 can be disposed on the base plate portion 111, and the base plate portion 111 can protrude beyond the lateral periphery of the main magnet 121. The main magnetic plate 122 is disposed on the main magnet 121, forming a convex structural design between the main magnet unit 12 and the base plate portion 111 of the magnetic yoke 11.

[0077] As described above, the magnetic return assembly 1 of the present invention adopts a convex structural design. After the waterproof diaphragm assembly 3 is assembled with the magnetic return assembly 1, the thin voice coil 21 can be correspondingly arranged around the outside of the main magnetic plate 122 of the magnetic return assembly 1, and corresponding to the position of the magnetic gap 14 between the main magnet unit 12 and each long side 112 and each short side 113. Therefore, the volume of the main magnet unit 12 and the magnetic yoke 11 combined can be larger, the magnetic force can be stronger, the efficiency of the thin waterproof speaker can be better, and it is more conducive to the presentation of sound quality. In addition, the height created by the annular spacer 4 can facilitate the placement of the magnetic return assembly 1 under limited height, and provide the waterproof diaphragm 31 with free operating space, so as to avoid the waterproof diaphragm 31 hitting the magnetic return assembly 1 and producing abnormal noise when it operates. Secondly, it also avoids the high temperature generated by the thin voice coil 21 when it operates from being directly transferred to the waterproof diaphragm 31, so as to maintain the material stability of the waterproof diaphragm 31 and the planar dome 32.

[0078] The aforementioned thin voice coil assembly 2 may have two springs 22, each spring 22 having a thin voice coil bonding portion 221, a fixing portion 222, and an elastic arm 223. The elastic arm 223 connects the thin voice coil bonding portion 221 and the fixing portion 222, and the fixing portion 222 may have two electrical contacts 224. The thin voice coil 21 may be fabricated using a semiconductor wafer substrate process, mainly formed by interconnecting layers of wires and may be U-shaped. Alternatively, the thin voice coil 21 may be fabricated using a semiconductor wafer process, mainly by stacking, photoresisting, exposure, and etching processes on a semiconductor substrate (e.g., a silicon wafer) to create a wafer coil structure. The thin voice coil 21 can realize the thin voice coil architecture of the present invention regardless of whether a substrate process or a wafer process is used. Each spider 22 (e.g., FPC) can be composed of the thin voice coil bonding portion 221, the fixing portion 222, and the elastic arm 223. The thin voice coil 21 and the thin voice coil bonding portion 221 can be electrically connected using SMT or hot bar soldering processes. Each spider 22 (e.g., FPC) mainly provides two functions: first, to provide electrical connection, for example, the fixing portion 222 is provided with electrical contacts 224 to provide electrical connection for external input electronic lines; second, to provide damping, for example, the shape of the S-shaped elastic arm 223 can maintain the axial operation of the waterproof diaphragm assembly 3 and the thin voice coil 21 to avoid polarization distortion. The magnetic return assembly 1 can be used with the thin voice coil 21. Since the thickness of the thin voice coil 21 is significantly reduced compared to conventional thick voice coils, the magnetic return assembly 1 can achieve a thinner waterproof loudspeaker. Furthermore, the thin voice coil 21 refers to a semiconductor IC substrate manufacturing process, which significantly reduces the thickness of the voice coil 21. Simultaneously, the thin voice coil 21 can replace conventional leads with spiders 22, allowing for direct electrical connection between the voice coil 21 and the spiders 22 using processes such as hot bar soldering. This enables faster processing and more convenient operation. The spiders 22 also avoid the breakage issues associated with conventional leads. Additionally, the spiders 22 further enhance damping to stabilize the axial vibration of the thin voice coil 21, thereby reducing distortion. Moreover, as... Figure 2 and Figure 4 As shown, the waterproof diaphragm assembly 3 can be combined with the two short side fitting flanges 332 of the diaphragm bracket 33 to the two short side fitting surfaces 312 of the bottom of the waterproof diaphragm 31 and the fixing part 222 of each spring 22 to be respectively assembled to each set of flanges 115 of the magnetic return assembly 1.

[0079] The waterproof diaphragm 31 can be made of engineering plastics such as PEEK, foamed plastics, rubber, or silicone rubber, while the planar dome 32 can be made of engineering plastics such as PET, PEN, or PEEK, or metal materials such as aluminum alloy. If the waterproof diaphragm 31 is made of silicone rubber, it can be integrally injection molded with the planar dome 32. If the waterproof diaphragm 31 is made of PEEK, it can be thermoformed together with the planar dome 32.

[0080] In the aforementioned magnetic return assembly 1, the base plate 111, each long side 112, each short side 113, each diaphragm mounting groove 114, and each set of flanges 115 can be integrally formed. This improves the structural strength of the magnetic yoke 11 of the present invention.

[0081] Please refer to Figure 1 and Figure 2 As shown in the figure, a first vent 116 may be provided between each long side portion 112 and each short side portion 113, and a second vent 117 may be provided between each long side portion 112 and the base plate portion 111. In this way, each first vent 116 and each second vent 117 can discharge the gas inside the thin waterproof speaker, thereby improving the operating efficiency of the waterproof diaphragm 31.

[0082] Please refer to this again. Figure 5 and Figure 6 As shown in the figure, the magnetic return assembly 1, in addition to being used in the above-mentioned type of waterproof diaphragm assembly 3, can also be used in various other types of waterproof diaphragm assemblies 3. For example, the annular gasket 4 disclosed in this embodiment can be a metal frame. The top of the annular gasket 4 may have two long-side connecting flanges 43 and two short-side connecting flanges 44 to connect to the bottom of the planar dome 32, and the bottom of the annular gasket 4 may connect to the thin voice coil 21. The metal frame can be made of aluminum alloy or stainless steel. In this way, the effects mentioned in the above embodiments can also be achieved.

[0083] Please refer to Figure 7As shown in the figure, the magnetic return assembly 1 may further include a secondary magnet 13, which is disposed between the base plate 111 and the main magnet unit 12. The secondary magnet 13 is disposed on the base plate 111, and the base plate 111 protrudes from the lateral periphery of the secondary magnet 13. The main magnet 121 is disposed on the secondary magnet 13, and the secondary magnet 13 protrudes from the lateral periphery of the main magnet 121 of the main magnet unit 12 and has an annular flange 131. The main magnetic plate 122 is disposed on the main magnet 121. In this way, the magnetic return assembly 1 of the present invention can utilize the coaxial stacking of the main magnet unit 12 and the secondary magnet 13 to form a convex magnet design, so that the magnetic return assembly 1 of the present invention can further increase the magnetic force to generate a greater magnetic field induction intensity, thereby increasing the volume. Furthermore, the thin voice coil 21 is disposed in the magnetic gap 14 formed between the main magnetic plate 122 and the magnetic yoke 11. Further, the thin voice coil 21 is disposed above the auxiliary magnet 13, and at least half of the projected area of ​​the thin voice coil 21 overlaps with the auxiliary magnet 13. Since conventional voice coils are not thin, an auxiliary magnet is not provided to avoid the voice coil colliding with it during vibration. However, with the thin voice coil design, even at maximum amplitude, the thin voice coil 21 will not collide with the magnetic yoke 11 below it. Therefore, the magnetic return assembly 1 can add an auxiliary magnet 13 in this space to increase the magnetic force. In this design, the distance between the bottom of the thin voice coil 21 (FPC) and the auxiliary magnet 13 should be greater than the distance between the planar dome 32 and the main magnetic plate 122.

[0084] Please refer to Figure 8As shown in the figure, in the above-mentioned magnetic return assembly 1, each long side portion 112 may have a side magnet 1121 and a side magnetic guide plate 1122. Each side magnet 1121 may be disposed on the two long sides of the base plate portion 111, and each side magnetic guide plate 1122 may be disposed on each side magnet 1121, so that the magnetic return assembly 1 forms an internal and external magnetic design. The width of each side magnetic guide plate 1122 may be smaller than the width of each side magnet 1121, and each diaphragm insertion groove 114 may be located between the top of each side magnet 1121 and the side portion of each side magnetic guide plate 1122. Thus, when the waterproof diaphragm assembly 3 is combined with the magnetic return assembly 1, the two long-side fitting flanges 331 of the diaphragm bracket 33 cooperate with the two long-side fitting surfaces 311 of the waterproof diaphragm 31 to form two fitting grooves, which are respectively disposed in each diaphragm fitting groove 114 (assembly step). The two short-side fitting flanges 332 of the diaphragm bracket 33 cooperate with the two short-side fitting surfaces 312 of the waterproof diaphragm 31 to form two fitting grooves, which are respectively disposed in each of the two sets of joint edges 115 of each short-side portion 113 of the magnetic yoke 11. This solves the positioning problem between the waterproof diaphragm assembly 3 and the magnetic return assembly 1, thereby facilitating their assembly and making it easier to assemble the waterproof diaphragm assembly 3 into the magnetic return assembly 1. Furthermore, the base plate portion 111, each short-side portion 113, and each set of joint edges 115 can be integrally formed. Therefore, the magnetic yoke 11 of this embodiment can improve structural strength.

[0085] The present invention has been disclosed above with reference to preferred embodiments. However, those skilled in the art should understand that these embodiments are for illustrative purposes only and should not be construed as limiting the scope of the invention. It should be noted that all variations and substitutions equivalent to these embodiments should be considered within the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A waterproof diaphragm assembly with a thin voice coil, characterized in that, For combining a magnetic return assembly and a thin voice coil assembly, the waterproof diaphragm assembly is combined with the magnetic return assembly, the thin voice coil assembly is combined with the waterproof diaphragm assembly, and the waterproof diaphragm assembly includes: A waterproof diaphragm, with a long-side interlocking surface on each of its two bottom sides; A diaphragm support, which is combined with the waterproof diaphragm, has a long-side fitting flange on each side of its bottom, with each long-side fitting flange corresponding to one side of its long-side fitting surface. The long-side fitting flanges of the diaphragm support mate with the long-side fitting surfaces of the waterproof diaphragm for assembly into the magnetic return assembly; and An annular gasket is disposed at the bottom of the waterproof diaphragm. The bottom of the annular gasket is used to assemble a thin voice coil of the thin voice coil assembly so that the thin voice coil aligns with a main magnetic plate of the magnetic return assembly. The thin voice coil is disposed in a magnetic gap between the main magnetic plate and a magnetic yoke of the magnetic return assembly. The inner periphery of the thin voice coil is adjacent to the outer periphery of the main magnetic plate.

2. The waterproof diaphragm assembly according to claim 1, characterized in that, The bottom of the waterproof diaphragm has a short side fitting surface on each of its other two sides, and the bottom of the diaphragm bracket has a short side fitting flange on each of its other two sides. Each short side fitting flange is located on one side of each short side fitting surface. Each short side fitting flange of the diaphragm bracket is used in conjunction with each short side fitting surface of the waterproof diaphragm for assembly into the magnetic return assembly.

3. The waterproof diaphragm assembly according to claim 1, characterized in that, The top of the diaphragm support has a ring-shaped interlocking flange for attaching to the waterproof diaphragm.

4. The waterproof diaphragm assembly according to claim 1, characterized in that, The annular gasket has an annular foam body and two annular plates. The annular foam body is disposed between the annular plates. One of the annular plates is disposed at the bottom of the waterproof diaphragm. The other two annular plates are used to assemble the thin voice coil of the thin voice coil assembly.

5. The waterproof diaphragm assembly according to claim 4, characterized in that, The material of the ring-shaped foam is a high-molecular foam material of polymethacrylimide, and each ring-shaped sheet is a ring-shaped aluminum foil sheet.

6. The waterproof diaphragm assembly according to claim 4, characterized in that, The thickness of the annular foam is greater than the sum of the thicknesses of the individual annular sheets.

7. The waterproof diaphragm assembly according to claim 6, characterized in that, The thickness of the annular foam is more than twice the sum of the thicknesses of the individual annular sheets.

8. The waterproof diaphragm assembly according to claim 1, characterized in that, The annular gasket is a metal frame, and the top of the annular gasket has two long side connecting flanges and two short side connecting flanges to connect to the bottom of the waterproof diaphragm.

9. The waterproof diaphragm assembly according to claim 8, characterized in that, The metal frame is made of aluminum alloy or stainless steel.

10. The waterproof diaphragm assembly according to claim 1, characterized in that, It also includes a planar dome located at the bottom of the waterproof diaphragm, and the bottom of the planar dome is connected to the annular gasket.

11. The waterproof diaphragm assembly according to claim 1, characterized in that, The horizontal center of the thin voice coil is at the same horizontal height as the horizontal center of the main magnet.

12. The waterproof diaphragm assembly according to claim 1, characterized in that, The thin voice coil at the bottom of the annular gasket is positioned above a secondary magnet of the magnetic return assembly, and at least half of the projected area of ​​the thin voice coil overlaps with the secondary magnet.

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