magnetic return assembly with thin voice coil

Abstract

A magnetic return assembly with a thin voice coil is disclosed, used to combine a waterproof diaphragm assembly and a thin voice coil assembly. The thin voice coil assembly is integrated into the waterproof diaphragm assembly. The magnetic return assembly includes a magnetic yoke and a main magnet unit. The magnetic yoke includes a base plate, a long side, a short side, a diaphragm mounting groove, and an assembly flange. The diaphragm mounting groove is located at the top of the long side to mount the diaphragm assembly, and the assembly flange is located at the top of the short side to assemble the diaphragm assembly and the thin voice coil assembly. The main magnet unit is located at the base plate. Therefore, the magnetic return assembly of this invention can form a convex structural design, allowing for a larger volume and stronger magnetic force. Furthermore, the thin voice coil can correspond to the magnetic gap between the main magnet unit and the long and short sides, resulting in better efficiency and improved sound quality in the thin waterproof loudspeaker.

Description

[Technical Field]

[0001] The present invention provides a magnetic return assembly in conjunction with a thin voice coil, particularly a convex structural design that allows the magnetic return assembly to have a larger volume and stronger magnetic force, thereby improving the efficiency of the thin waterproof speaker and enhancing the sound quality presentation. [Previous Technology]

[0002] The magnetic force of the magnetic return component of a conventional loudspeaker is usually weak, especially when the loudspeaker is installed in a thin electronic device.

[0003] Therefore, how to invent a magnetic return assembly that matches a thin voice coil in order to achieve a convex structural design, so that the magnetic return assembly can be larger in volume and stronger in magnetic force, and the thin voice coil can correspond to the magnetic gap between the main magnet unit and the long side and the short side, so that the efficiency of the thin waterproof speaker can be better and more conducive to the presentation of sound quality. [Summary of the Invention]

[0004] In view of the shortcomings of the above-mentioned prior art, the inventor felt that it was not perfect, so he devoted his mind to research and overcoming it, and then developed a magnetic return assembly that works with a thin voice coil, in order to achieve a convex structural design. The magnetic return assembly can be larger in size and stronger in magnetic force. The thin voice coil can correspond to the magnetic gap between the main magnet unit and the long side and the short side, so that the efficiency of the thin waterproof speaker can be better and more conducive to the presentation of sound quality.

[0005] To achieve the above and other objectives, the present invention provides a magnetic return assembly in conjunction with a thin voice coil, which is used to combine a waterproof diaphragm assembly and a thin voice coil assembly. The thin voice coil assembly is combined with the waterproof diaphragm assembly. The magnetic return assembly includes: a magnetic yoke and a main magnet unit. The magnetic yoke includes a base plate, two long sides, two short sides, two diaphragm mounting slots, and two sets of flanges. The long sides are symmetrically arranged on the two long sides of the base plate, and the short sides are symmetrically arranged on the two short sides of the base plate. The diaphragm mounting slots are respectively located on the top of the long sides for mounting the waterproof diaphragm assembly. The sets of flanges are respectively located on the top of the short sides for assembling the waterproof diaphragm assembly and the thin voice coil assembly. The main magnet unit is located on the base plate of the magnetic yoke, and the base plate protrudes from the lateral periphery of the main magnet unit. The top of the main magnet unit is used to align with a thin voice coil of the thin voice coil assembly. The thin voice coil is disposed in a magnetic gap between a main magnetic plate of the main magnet unit and the magnetic yoke. The inner periphery of the thin voice coil is adjacent to the outer periphery of the main magnetic plate.

[0006] In the above-mentioned magnetic return assembly, the main magnet unit includes a main magnet, which is disposed on the base plate and the base plate protrudes from the lateral periphery of the main magnet. The main magnetic plate is disposed on the main magnet to correspond to the thin voice coil of the thin voice coil assembly.

[0007] In the above-mentioned magnetic return assembly, the horizontal center of the thin voice coil and the horizontal center of the main magnetic plate are at the same horizontal height.

[0008] The above-mentioned magnetic return assembly further includes a secondary magnet, which is disposed between the base plate and the main magnet unit. The base plate protrudes from the lateral periphery of the secondary magnet, and the secondary magnet protrudes from the lateral periphery of the main magnet unit and has an annular flange.

[0009] In the above-mentioned magnetic return assembly, the main magnet unit includes a main magnet and a main magnetic plate. The main magnet is disposed on the auxiliary magnet and the auxiliary magnet protrudes from the lateral periphery of the main magnet and has the annular flange. The main magnetic plate is disposed on the main magnet to correspond to the thin voice coil of the thin voice coil assembly.

[0010] In the above-mentioned magnetic return assembly, the thin voice coil is disposed above the auxiliary magnet, and at least half of the projected area of ​​the thin voice coil overlaps with the auxiliary magnet.

[0011] In the above-mentioned magnetic return assembly, the base plate, the long side, the short side, the diaphragm insertion groove and the assembly flange are integrally formed.

[0012] In the above-mentioned magnetic return assembly, each of the equal long side portions has a magnet on one side and a magnetic guide plate on one side. The equal side magnets are respectively disposed on the two long side sides of the bottom plate portion, and the equal side magnetic guide plates are respectively disposed on the equal side magnets.

[0013] In the above-mentioned magnetic return assembly, the width of each side magnetic plate is smaller than the width of each side magnet, and each diaphragm insertion groove is located between the top of each side magnet and the side of each side magnetic plate.

[0014] In the above-mentioned magnetic return assembly, the base plate, the short side portions and the connecting edges are integrally formed.

[0015] Accordingly, the magnetic return assembly of the present invention with a thin voice coil makes it easy to assemble the waterproof diaphragm assembly and the thin voice coil assembly into the magnetic return assembly, thereby improving the assembly yield of the thin waterproof loudspeaker.

Implementation Method

[0017] To fully understand the purpose, features, and effects of the present invention, the present invention will be described in detail below with reference to the following specific embodiments and accompanying drawings, as follows:

[0018] Please refer to Figures 1 to 4. As shown, the present invention provides a magnetic return assembly 1 that works with a thin voice coil 21. This assembly can be used to combine an annular gasket 4, a waterproof diaphragm assembly 3, and a thin voice coil assembly 2 to form a thin waterproof loudspeaker. The annular gasket 4, 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 annular gasket 4 may have an annular foam 41 and two annular aluminum foil sheets 42. The annular foam 41 may be made of polymethacrylimide (PMI) polymer foam and is disposed between the annular aluminum foil sheets 42. In addition to the aforementioned annular gasket 4, the annular foam 41 can also be made of MCPET foam. The upper and lower annular aluminum foil sheets 42 require materials with certain strength and the ability to withstand the high temperature of the thin voice coil 21. Therefore, these annular aluminum foil sheets 42 can be composed of other metals (e.g., titanium) or non-metallic inorganic materials (e.g., graphite). The waterproof diaphragm assembly 3 may have a waterproof diaphragm 31, a planar dome 32, and a diaphragm support 33. The waterproof diaphragm 31, the planar dome 32, and the diaphragm support 33 may be integrally injection molded. The planar dome 32 may be assembled at the bottom of the waterproof diaphragm 31. The waterproof diaphragm 31 may be assembled at the diaphragm support 33. The diaphragm support 33 may have an annular interlocking flange 333 to be assembled at the waterproof diaphragm 31, thereby improving the strength of the waterproof diaphragm 31 assembled at the diaphragm support 33. The annular gasket 4 may be adhered to the bottom of the planar dome 32. The thin voice coil assembly 2 may have a thin voice coil 21 and two springs 22. The springs 22 may be combined at the bottom of the two symmetrical short side portions 211 of the thin voice coil 21. The thin voice coil 21 may be combined at the bottom of the annular gasket 4 to be combined with the waterproof diaphragm 31 and the planar dome 32.

[0019] The 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 grooves 114, and two sets of flanges 115. The equal long side portions 112 may be symmetrically arranged on the two long side sides of the base plate portion 111, and the equal short side portions 113 may be symmetrically arranged on the two short side sides of the base plate portion 111. The equal diaphragm mounting grooves 114 may be disposed on the inner side of the top of the equal long side portions 112 for mounting the waterproof diaphragm assembly 3. The waterproof diaphragm assembly 3 may be assembled into the equal diaphragm mounting grooves 114 by the two long side mounting flanges 331 of the diaphragm bracket 33 engaging with the two long side mounting surfaces 311 of the bottom periphery of the waterproof diaphragm 31. In addition, the flanges 115 can be disposed on the inner side of the top of the short side portions 113 for fitting the waterproof diaphragm assembly 3. The waterproof diaphragm assembly 3 can be assembled with the flanges 115 by the two short side fitting flanges 332 of the diaphragm bracket 33 and the two short side fitting surfaces 312 of the bottom periphery of the waterproof diaphragm 31. 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 be matched with the two long-side fitting surfaces 311 of the waterproof diaphragm 31 to be respectively disposed in the diaphragm fitting grooves 114 (assembly steps), and the two short-side fitting flanges 332 of the diaphragm bracket 33 can be matched with the two short-side fitting surfaces 312 of the waterproof diaphragm 31 to be respectively disposed in the two sets of flanges 115 of the short side portions 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, so that the waterproof diaphragm assembly 3 can be easily assembled into the magnetic return assembly 1.

[0020] The 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 from the lateral periphery of the main magnet unit 12. The top of the main magnet unit 12 is used to align with a thin voice coil 21 of the thin voice coil assembly 2 to improve magnetic conductivity. In addition, the thin voice coil 21 is disposed in a magnetic gap 14 between a main magnetic plate 122 of the main magnet unit 12 and the magnetic yoke 11. The inner periphery of the thin voice coil 21 is adjacent to the outer periphery of the main magnetic plate 122. The main magnet unit 12 may include a main magnet 121, which can be disposed on the base plate portion 111, and the base plate portion 111 can protrude from the lateral periphery of the main magnet. The main magnetic plate 122 is disposed on the main magnet 121, so that the main magnet unit 12 and the base plate portion 111 of the magnetic yoke 11 form a convex structural design. Furthermore, the dominant magnetic plate 122 can be used to align with the thin voice coil 21 of the thin voice coil assembly 2 to improve magnetic conductivity. Additionally, the annular spacer 4 is used to connect the bottom surface of the waterproof diaphragm 31 to the top surface of the thin voice coil 21. The height of the annular spacer 4 depends on the position that generates the maximum electromagnetic force between the thin voice coil 21 and the dominant magnetic plate 122. Further, the horizontal center of the thin voice coil 21 and the horizontal center of the dominant magnetic plate 122 are approximately at the same horizontal level to ensure that the dominant magnetic plate 122 can provide the maximum magnetic force to the thin voice coil 21, thereby generating the maximum electromagnetic force. This allows the thin voice coil 21 to achieve the maximum displacement under force, resulting in greater volume and better sound quality.

[0021] 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 the long side portion 112 and the short side portion 113. Therefore, the volume of the main magnet unit 12 and the magnetic yoke 11 after combination 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, by using the annular spacer 4 to create a height, it is convenient to accommodate the magnetic return assembly 1 with limited height, and provide the waterproof diaphragm 31 with free movement space, so as to avoid the waterproof diaphragm 31 hitting the magnetic return assembly 1 when it moves and producing abnormal noise. Secondly, it also avoids the high temperature generated by the thin voice coil 21 when it moves directly to the waterproof diaphragm 31, so as to maintain the material stability of the waterproof diaphragm 31 and the planar dome 32.

[0022] Furthermore, the magnetic return assembly 1 of the present invention is equipped with a thin voice coil 21. Therefore, the magnetic return assembly 1 of the present invention is not limited to the conventional thick voice coil design. A conventional thick voice coil requires a clearance area below it to prevent the thin waterproof speaker from impacting the magnetic yoke when it operates. Due to the design of the thin voice coil 21, the vertical amplitude of the thin voice coil 21 can be smaller. Therefore, a magnet can be placed in the space below the thin voice coil 21 to form a convex magnet design. In this way, 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.

[0023] The aforementioned spring coils 22 may each have a thin voice coil bonding portion 221, a fixing portion 222, and an elastic arm 223. The elastic arm 223 is connected between the thin voice coil bonding portion 221 and the fixing portion 222. 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 by connecting layers of interconnected wires and may be in a U-shape. Alternatively, the thin voice coil 21 may also be fabricated using a semiconductor wafer process, mainly by stacking, photoresisting, exposure, and etching processes on a semiconductor substrate (e.g., silicon wafer) to create a wafer coil structure. The thin voice coil 21 can realize the thin voice coil architecture of the present invention whether it is fabricated using a substrate process or a wafer process. The springs 22 (e.g., FPCs) 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. The springs 22 (e.g., FPCs) mainly provide 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 movement of the waterproof diaphragm assembly 3 and the thin voice coil 21 to avoid polarization distortion. The magnetic return assembly 1 of the present invention 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 of the present invention can realize a thinner waterproof loudspeaker. Furthermore, the thin voice coil 21 refers to a semiconductor IC substrate manufacturing process, which can significantly reduce the thickness of the voice coil 21. Simultaneously, the thin voice coil 21 can replace conventional leads using springs 22. Therefore, the thin voice coil 21 can be directly electrically connected to the springs 22 using processes such as hot bar soldering, which allows for faster processing and more convenient operation. The springs 22 also avoid the problem of easy breakage associated with conventional leads. In addition, the springs 22 can further enhance damping to stabilize the axial vibration of the thin voice coil 21, thereby reducing distortion. Moreover, as shown in Figures 2 and 4, the waterproof diaphragm assembly 3 can be assembled with the two short-side flanges 332 of the diaphragm support 33, the two short-side flange surfaces 312 of the bottom periphery of the waterproof diaphragm 31, and the fixing portions 222 of the springs 22, respectively, at the flanges 115.

[0024] The waterproof diaphragm 31 described above 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.

[0025] Please refer to Figure 5. As shown, the above-mentioned 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 to correspond to the thin voice coil 21 of the thin voice coil assembly 2 to improve magnetic conductivity. 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 make the magnetic return assembly 1 have 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 a 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.

[0026] Please refer to Figure 2. As shown in the figure, in the above-mentioned magnetic return assembly 1, the base plate portion 111, the long side portion 112, the short side portion 113, the diaphragm insertion groove 114, and the assembly flange 115 can be integrally formed. In this way, the magnetic yoke 11 of the present invention can improve the structural strength.

[0027] Please refer to Figure 6. As shown in the figure, in the above-mentioned magnetic return assembly 1, each of the long side portions 112 may have a side magnet 1121 and a side magnetic guide plate 1122. Each side magnet 1121 may be disposed on two long side portions 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 can be matched with the two long-side fitting surfaces 311 of the waterproof diaphragm 31 to be respectively disposed in the diaphragm fitting grooves 114 (assembly steps), and the two short-side fitting flanges 332 of the diaphragm bracket 33 can be matched with the two short-side fitting surfaces 312 of the waterproof diaphragm 31 to be respectively disposed in the two sets of flanges 115 of the short-side portions 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. In addition, the base plate portion 111, the short-side portions 113, and the sets of flanges 115 can be integrally formed. In this way, the magnetic yoke 11 of this embodiment can improve structural strength.

[0028] Please refer to Figures 7 and 8. As shown, the magnetic return assembly 1 of the present invention can be used not only in the waterproof diaphragm assembly 3 of the above-mentioned type, but also in various other waterproof diaphragm assemblies 3, such as the waterproof diaphragm assembly 3 disclosed in this embodiment that does not have the annular gasket 4, but instead has an annular metal frame 34. The top of the annular metal frame 34 may have two long-side connecting flanges and two short-side connecting flanges to connect to the bottom of the planar dome. The bottom of the annular metal frame 34 may connect to the thin voice coil 21. The material of the annular metal frame 34 may be aluminum alloy or stainless steel. Thus, the effects mentioned in the above embodiments can also be achieved.

[0029] Please refer to Figures 1 and 2. As shown, each of the long side portions 112 and each of the short side portions 113 may have a first vent 116, and each of the long side portions 112 and the base plate portion 111 may have a second vent 117. In this way, the first vent 116 and the second vent 117 can discharge the gas inside the thin waterproof speaker, thereby improving the operating efficiency of the waterproof diaphragm 31.

[0030] The present invention has been disclosed above with reference to preferred embodiments. However, those skilled in the art should understand that these embodiments are only used to describe the present invention and should not be construed as limiting the scope of the present invention. It should be noted that all variations and substitutions equivalent to these embodiments should be included within the scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the claims. [Simplified Explanation of the Diagram]

[0016] [Figure 1] is a schematic diagram of the appearance of the first embodiment of the present invention. [Figure 2] is an exploded view of the first embodiment of the present invention. [Figure 3] is a cross-sectional view of the first embodiment of the present invention. [Figure 4] is a cross-sectional view of the first embodiment of the present invention. [Figure 5] is a cross-sectional view of the second embodiment of the present invention. [Figure 6] is a cross-sectional view of the third embodiment of the present invention. [Figure 7] is an exploded view of the fourth embodiment of the present invention. [Figure 8] is a cross-sectional view of the fourth embodiment of the present invention.

Claims

1. A magnetic return assembly for use with a thin voice coil, which is used to combine a waterproof diaphragm assembly and a thin voice coil assembly, the thin voice coil assembly being combined with the waterproof diaphragm assembly, the magnetic return assembly comprising: a magnetic yoke, which includes a base plate portion, two long sides, two short sides, two diaphragm mounting slots and two sets of flanges, the long sides being symmetrically disposed on the two long sides of the base plate portion, the short sides being symmetrically disposed on the two short sides of the base plate portion, the diaphragm mounting slots being respectively disposed on the top of the long sides for mounting the waterproof diaphragm assembly, and the sets of flanges being respectively disposed on the top of the short sides for assembling the waterproof diaphragm assembly and the thin voice coil assembly; A main magnet unit is disposed on the base plate of the magnetic yoke, and the base plate protrudes from the lateral periphery of the main magnet unit. The top of the main magnet unit is used to align with a thin voice coil of the thin voice coil assembly. The thin voice coil is disposed in a magnetic gap between a main magnetic plate of the main magnet unit and the magnetic yoke. The inner periphery of the thin voice coil is adjacent to the outer periphery of the main magnetic plate. A secondary magnet is disposed between the base plate and the main magnet unit. The base plate protrudes from the lateral periphery of the secondary magnet. The secondary magnet protrudes from the lateral periphery of the main magnet unit and has an annular flange.

2. The magnetic return assembly as claimed in claim 1, wherein the main magnet unit includes a main magnet disposed on the base plate portion and the base plate portion protruding from the lateral periphery of the main magnet, and the main magnetic plate is disposed on the main magnet for corresponding to the thin voice coil of the thin voice coil assembly.

3. The magnetic return assembly as described in claim 2, wherein the horizontal center of the thin voice coil is at the same horizontal height as the horizontal center of the main magnetic plate.

4. The magnetic return assembly as claimed in claim 1, wherein the main magnet unit includes a main magnet and a main magnetic plate, the main magnet is disposed on the auxiliary magnet and the auxiliary magnet protrudes from the lateral periphery of the main magnet and has the annular flange, and the main magnetic plate is disposed on the main magnet for corresponding to the thin voice coil of the thin voice coil assembly.

5. The magnetic return assembly as claimed in claim 1, wherein the thin voice coil is disposed above the auxiliary magnet, and at least half of the projected area of ​​the thin voice coil overlaps with the auxiliary magnet.

6. The magnetic return assembly as claimed in claim 1, wherein the base plate portion, the long side portions, the short side portions, the diaphragm insertion grooves and the assembly flanges are integrally formed.

7. The magnetic return assembly as described in claim 1, wherein each of the equal long sides has a magnet on one side and a magnetic guide plate on one side, the equal magnets are respectively disposed on the two long sides of the base plate, and the equal magnetic guide plates are respectively disposed on the equal magnets.

8. The magnetic return assembly as described in claim 7, wherein the base plate, the short sides, and the assembly flanges are integrally formed.

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