Manufacturing method of acoustic silica gel vibrating diaphragm

Abstract

The invention belongs to the technical field of loudspeakers, and particularly relates to a manufacturing method of an acoustic silica gel vibrating diaphragm, which comprises the following steps: S100, providing a plastic frame and a PEN sheet, and placing the PEN sheet in the middle of the plastic frame, so that an annular gap is formed between the PEN sheet and the plastic frame; and S200, injecting and melting a silica gel raw material to the annular gap until a silica gel connecting ring for connecting the plastic frame and the PEN sheet is formed. According to the invention, on one hand, the connection between the PEN sheet and the plastic basin stand is more stable, and even if the acoustic silica gel diaphragm is used for a long time at high frequency, the connection between the PEN sheet and the plastic basin stand does not fall off; and on the other hand, the vibration frequency of the PEN sheet is more regular and reliable due to the arrangement of the silica gel connecting ring, and the generated acoustic effect is better guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of loudspeakers, and in particular relates to a method for manufacturing an acoustic silicone diaphragm. Background Art

[0002] Speakers are a component that can convert electrical energy into sound. They are widely used in terminal electronic devices such as mobile phones, tablet computers, laptops, and PDAs. Among them, the speaker diaphragm inside the speaker plays a key role in the sound quality of the speaker. Among them, the existing speaker diaphragm is composed of a PEN sheet (PEN is the abbreviation of polyethylene naphthalate) connected to a plastic bracket, and then connected to other parts of the speaker through the plastic bracket for installation.

[0003] However, the existing speaker diaphragm of this structure is prone to water leakage at the connection between the plastic bracket and other parts of the speaker, with poor sealing and low waterproof level. Secondly, the PEN sheet is directly connected to the plastic bracket, which has poor firmness and stability. As the use time increases, the PEN sheet will vibrate frequently during actual work, causing it to become disconnected from the plastic bracket. More importantly, the direct connection between the PEN sheet and the plastic bracket will also affect the vibration frequency of the PEN sheet, thereby causing the acoustic effect of the speaker diaphragm to deteriorate. Summary of the invention

[0004] The object of the present invention is to provide a method for manufacturing an acoustic silicone diaphragm, aiming to at least solve one of the above-mentioned technical problems existing in the speaker diaphragm in the prior art.

[0005] To achieve the above object, an embodiment of the present invention provides a method for manufacturing an acoustic silicone diaphragm, comprising the following steps:

[0006] S100: providing a plastic basin frame and a PEN sheet, and placing the PEN sheet in the middle of the plastic basin frame so that an annular gap is formed between the PEN sheet and the plastic basin frame;

[0007] S200: Injecting molten silicone raw material into the annular gap until a silicone connecting ring connecting the plastic basin frame and the PEN sheet is formed.

[0008] Optionally, after the step S200, the method further includes a step S300: injecting hot-melt silicone raw material onto the outer periphery of the plastic basin frame until a silicone waterproof ring attached to the plastic basin frame is formed.

[0009] Optionally, in the step S100, an injection mold is provided, wherein the injection mold includes a bottom mold plate, a middle plate and a top mold plate;

[0010] The bottom mold plate is provided with a plurality of boss bottom molds, a PEN sheet groove for placing the PEN sheet is formed in the middle of the boss bottom mold, a plastic basin frame groove for placing the plastic basin frame is formed on the periphery of the boss bottom mold, and a connecting ring groove is formed in the annular gap area between the PEN sheet groove and the plastic basin frame groove on the boss bottom mold;

[0011] The middle plate is provided with boss holes matching the positions and shapes of the boss bottom molds, the middle plate cover is arranged on the bottom mold plate, the boss holes are respectively sleeved outside the boss bottom molds, and a waterproof ring groove is formed between the top edge of the boss hole and the plastic basin frame placed in the plastic basin frame groove;

[0012] The top mold plate is provided with a positioning top mold whose position is matched with each of the boss bottom molds and whose shape is matched with the plastic basin frame and the PEN sheet located in the plastic basin frame. The top mold plate is covered on the middle plate, and each of the positioning top molds presses against the plastic basin frame and the PEN sheet corresponding to its position.

[0013] Optionally, the injection mold also includes a support plate and positioning rods, the support plate is connected to a plurality of vertically arranged positioning rods, the bottom template, the middle plate and the top template are respectively provided with bottom plate positioning holes, middle plate positioning holes and top plate positioning holes which correspond to each other in position and are sequentially provided for the positioning rods to pass through, and the support plate is supported on the bottom of the bottom template.

[0014] Optionally, two opposite sides of the middle plate are respectively connected with middle plate handles; and / or two opposite sides of the top plate are respectively connected with top plate handles.

[0015] Optionally, after the step S300, the method further includes step S400: removing the top mold plate, lifting the middle plate, and using an ejection jig to contactlessly eject the acoustic silicone diaphragm attached and formed in the boss hole, thereby unloading the acoustic silicone diaphragm.

[0016] Optionally, the ejection fixture includes a positioning plate, a force application plate, a moving plate, a guide column, a return spring and an ejection column;

[0017] The guide post is vertically connected to the positioning plate, the return spring is sleeved outside the guide post, the movable plate is provided with a sliding hole corresponding to the position of the guide post, the guide post penetrates the sliding hole, the movable plate presses the return spring, the force application plate is arranged above the movable plate and is locked with the movable plate, a position of the force application plate corresponding to the guide post is provided with an avoidance hole, a limiting ring is provided in the avoidance hole that is locked with the guide post and presses against the movable plate, the ejector post is connected to the movable plate, and the positioning plate is provided with an ejection hole for the ejector post to penetrate;

[0018] The positioning plate is shifted to the top of the middle plate, and after pressing down the force plate, the movable plate is forced to compress the return spring guided by the guide column, and drive the ejection column to pass through the ejection hole, and finally contact the acoustic silicone diaphragm through the end of the ejection column until the acoustic silicone diaphragm is ejected from the boss hole.

[0019] Optionally, a flexible column for flexibly contacting the middle plate is provided at the bottom of the positioning plate; and / or a positioning plate handle is provided at the top of the positioning plate.

[0020] Optionally, the silicone connecting ring includes a U-shaped portion and a first bite portion and a second bite portion connecting the two free ends of the U-shaped portion, the first bite portion forming a first bite groove bite-connected to the plastic basin frame, and the second bite portion forming a second bite groove bite-connected to the PEN sheet.

[0021] Optionally, a draft bevel is formed on at least one side of the periphery of the engagement connection between the second engagement portion and the PEN sheet.

[0022] The above one or more technical solutions in the method for manufacturing an acoustic silicone diaphragm provided by an embodiment of the present invention have at least one of the following technical effects: In the method for manufacturing an acoustic silicone diaphragm of the present invention, a PEN sheet is placed in the middle of a plastic basin frame so that an annular gap is formed between the PEN sheet and the plastic basin frame, and then a silicone connecting ring connected between the plastic basin frame and the PEN sheet is formed at the annular gap by injection molding molten silicone raw material, thereby forming an acoustic silicone diaphragm. The acoustic silicone diaphragm of such a structure is connected between the PEN sheet and the plastic basin frame by a silicone connecting ring made of silicone material. On the one hand, the connection between the PEN sheet and the plastic basin frame can be made more stable, and even if the acoustic silicone diaphragm is used for a long time and at a high frequency, the connection between the PEN sheet and the plastic basin frame will not fall off; on the other hand, the setting of the silicone connecting ring makes the vibration frequency of the PEN sheet more regular and reliable, and the acoustic effect produced is more guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 A flow chart of a method for manufacturing an acoustic silicone diaphragm provided in an embodiment of the present invention.

[0025] Figure 2 A schematic structural diagram of an acoustic silicone diaphragm manufactured by the method for manufacturing an acoustic silicone diaphragm provided in an embodiment of the present invention.

[0026] Figure 3 for Figure 2 Schematic diagram of the exploded structure of the acoustic silicone diaphragm.

[0027] Figure 4 for Figure 3 A cutaway view of the acoustic silicone diaphragm in the .

[0028] Figure 5 for Figure 4 A partial cutaway view of the acoustic silicone diaphragm in the .

[0029] Figure 6 This is a schematic structural diagram of the injection mold provided in step S100 in the method for manufacturing the acoustic silicone diaphragm provided in an embodiment of the present invention.

[0030] Figure 7 for Figure 6 Schematic diagram of the structural breakdown of the injection mold.

[0031] Figure 8 for Figure 6 Schematic diagram of the structure of the bottom template of the injection mold.

[0032] Fig. 9 for Figure 8 A schematic diagram of the enlarged local structure at point A in the middle.

[0033] Fig.10 for Figure 6 Schematic diagram of the structure of the top template of the injection mold.

[0034] Fig.11 A schematic diagram of the structure of the ejection fixture provided in step S400 in the method for manufacturing the acoustic silicone diaphragm provided in an embodiment of the present invention.

[0035] Fig.12 for Fig.11 A schematic diagram of the structure of the ejector fixture from another perspective.

[0036] Fig.13 for Fig.11 A cutaway view of the ejector fixture in Figure 1.

[0037] Fig.14 for Fig.11 Schematic diagram of the structural breakdown of the ejector fixture.

[0038] Among them, the reference numerals in the figure are:

[0039] 100—Acoustic Silicone Diaphragm 110—Plastic Basin Frame 120—PEN Sheet

[0040] 130—Silicone connecting ring 131—U-shaped portion 132—First bite portion

[0041] 133 - second bite portion 140 - silicone waterproof ring 1331 - draft bevel surface 1331

[0042] 200—injection mold 210—bottom mold plate 211—boss bottom mold

[0043] 212—bottom plate positioning hole 220—middle plate 221—boss hole

[0044] 222—Middle plate positioning hole 223—Middle plate handle 230—Top template

[0045] 231—Positioning top mold 232—Top plate positioning hole 233—Top plate handle

[0046] 240—support plate 250—positioning rod 2111—PEN sheet slot

[0047] 2112—Plastic basin frame groove 2113—Connection ring groove 300—Ejection fixture

[0048] 310—positioning plate 311—ejection hole 320—force plate

[0049] 321 - avoidance hole 322 - limit ring 323 - fastener

[0050] 330—moving plate 331—sliding hole 332—sinking hole

[0051] 340 - guide column 350 - return spring 360 - ejector column

[0052] 361 - bump 370 - flexible column 380 - positioning plate handle

[0053] 390—Height limit column. DETAILED DESCRIPTION

[0054] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. Figures 1 to 14 The described embodiments are exemplary and are intended to be used to explain the embodiments of the present invention, but should not be construed as limiting the present invention.

[0055] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0056] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0057] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0058] In one embodiment of the present invention, Figures 1 to 5 As shown, a method for manufacturing an acoustic silicone diaphragm 100 is provided, comprising the following steps:

[0059] S100: providing a plastic basin frame 110 and a PEN sheet 120, and placing the PEN sheet 120 in the middle of the plastic basin frame 110, so that an annular gap is formed between the PEN sheet 120 and the plastic basin frame 110;

[0060] S200: Injecting molten silicone raw material into the annular gap until a silicone connecting ring 130 connecting the plastic basin frame 110 and the PEN sheet 120 is formed.

[0061] In the manufacturing method of the acoustic silicone diaphragm 100 provided in the embodiment of the present invention, a PEN sheet 120 is placed in the middle of the plastic basin frame 110 so that an annular gap is formed between the PEN sheet 120 and the plastic basin frame 110, and then a silicone connecting ring 130 connected between the plastic basin frame 110 and the PEN sheet 120 is formed at the annular gap by injection molding of molten silicone raw material, so as to form the acoustic silicone diaphragm 100. The acoustic silicone diaphragm 100 with such a structure is connected between the PEN sheet 120 and the plastic basin frame 110 by the silicone connecting ring 130 made of silicone material. On the one hand, the connection between the PEN sheet 120 and the plastic basin frame can be made more stable, and even if the acoustic silicone diaphragm 100 is used for a long time and at a high frequency, the connection between the PEN sheet 120 and the plastic basin frame will not fall off; on the other hand, the setting of the silicone connecting ring 130 makes the vibration frequency of the PEN sheet 120 more regular and reliable, and the acoustic effect produced is more guaranteed.

[0062] See further Figure 1 In one embodiment of the present invention, after step S200, step S300 is further included: injecting hot-melt silicone raw material to the periphery of the plastic basin frame 110 until a silicone waterproof ring 140 attached to the plastic basin frame 110 is formed. In this embodiment, a circle of silicone waterproof ring 140 is further injected on the periphery of the plastic basin frame 110. Compared with the plastic basin frame 110, the silicone waterproof ring 140 is softer in material. Therefore, when the entire acoustic silicone diaphragm 100 is connected to other components on the speaker, it can fill the assembly gap, prevent water leakage, achieve high sealing performance, and improve the waterproof level of the acoustic silicone diaphragm 100.

[0063] In one embodiment of the present invention, in step S100, an injection mold 200 is provided. Figure 6 The injection mold 200 includes a bottom mold plate 210, a middle plate 220 and a top mold plate 230. The injection mold 200 in this embodiment is mainly composed of three plates: the bottom mold plate 210, the middle plate 220 and the top mold plate 230.

[0064] Further, see Figures 7-10, the bottom mold plate 210 is provided with a plurality of boss bottom molds 211, the middle of the boss bottom mold 211 forms a PEN sheet groove 2111 for placing the PEN sheet 120, the outer periphery of the boss bottom mold 211 forms a plastic basin frame groove 2112 for placing the plastic basin frame 110, and the annular gap area between the PEN sheet groove 2111 and the plastic basin frame groove 2112 on the boss bottom mold 211 forms a connecting ring groove 2113. Then, on the bottom mold plate 210, the PEN sheet groove 2111 where the PEN sheet 120 is placed and the plastic basin frame groove 2112 where the plastic basin frame 110 is placed can be placed first, so that the PEN sheet 120 is placed in the middle of the plastic basin frame 110, and the two form a distance, which provides space for the injection molding cavity for the subsequent injection molding of the silicone connecting ring 130.

[0065] Further, see Figures 7 to 9 The middle plate 220 is provided with boss holes 221 that match the positions and shapes of the boss bottom molds 211. The middle plate 220 is covered on the bottom mold plate 210. The boss holes 221 are respectively sleeved outside the boss bottom molds 211, and a waterproof ring groove is formed between the top edge of the boss hole 221 and the plastic basin frame 110 placed in the plastic basin frame groove 2112. The boss holes 221 on the middle plate 220 are sleeved on the boss bottom molds 211 on the bottom mold plate 210, and the two are matched. At the same time, a waterproof ring groove is formed between the top edge of the boss hole 221 and the plastic basin frame 110 placed in the plastic basin frame groove 2112. The formation of the waterproof ring groove provides space for the injection molding cavity for the injection molding silicone waterproof ring 140, and the structural design is ingenious.

[0066] Further, see Fig.10 The top mold plate 230 is provided with a positioning top mold 231 whose position is adapted to each of the boss bottom molds 211 and whose shape is adapted to the plastic basin frame 110 and the PEN sheet 120 located in the plastic basin frame 110. The top mold plate 230 is covered on the middle plate 220, and each of the positioning top molds 231 presses against the plastic basin frame 110 and the PEN sheet 120 corresponding to its position. Specifically, after the top template 230 is covered, the top template 230, the middle plate 220 and the bottom template 210 are molded together, and an injection cavity with the same shape as the silicone connecting ring 130 and the silicone waterproof ring 140 is formed inside the injection mold 200. Then, molten silicone raw material is injected through the injection hole set on the top template 230 to injection mold the silicone connecting ring 130 and the silicone waterproof ring 140, and then form an acoustic silicone diaphragm 100 together with the plastic basin frame 110 and the PEN sheet 120 placed on the boss bottom mold 211.

[0067] In one embodiment of the present invention, see Figures 6-7The injection mold 200 also includes a support plate 240 and a positioning rod 250. The support plate 240 is connected to a plurality of vertically arranged positioning rods 250. The bottom template 210, the middle plate 220 and the top template 230 are respectively provided with bottom plate positioning holes 212, middle plate positioning holes 222 and top plate positioning holes 232, which correspond to each other in position and are sequentially provided for the positioning rods 250 to pass through. The support plate 240 is supported at the bottom of the bottom template 210. Specifically, the support plate 240 is provided to provide installation support for the bottom template 210, and a positioning rod 250 is further provided on the support plate 240. Then, the bottom plate positioning hole 212, the middle plate positioning hole 222 and the top plate positioning hole 232 are respectively provided on the bottom template 210, the middle plate 220 and the top template 230 for the positioning rod 250 to pass through in sequence. In this way, the bottom template 210, the middle plate 220 and the top template 230 are stacked on the support plate 240 to achieve precise positioning and clamping of the injection mold 200.

[0068] In one embodiment of the present invention, see Figures 6-7 The middle plate 220 is respectively connected to middle plate handles 223 on two opposite sides. The middle plate handles 223 are provided to facilitate the staff to lift the middle plate 220. After the injection molding is completed, the acoustic silicone diaphragm 100 is still adhered to the boss hole 221 on the middle plate 220. The staff can hold the middle plate handles 223 and shift it to a suitable position, so as to facilitate the unloading of the acoustic silicone diaphragm 100.

[0069] Further, see Figures 6-7 The top plate handles 233 are connected to the opposite sides of the top plate 230. The top plate handles 233 are provided to facilitate the staff to open or cover the top plate 230. Of course, the top plate handles 233 are preferably arranged to be misaligned with the middle plate handles 223 in the above embodiment at least in terms of position, so as to avoid assembly interference between the two.

[0070] In one embodiment of the present invention, Figure 1 and 11 As shown, after the step S300, the method further includes step S400: removing the top plate 230, lifting the middle plate 220, and using the ejection jig 300 to contactlessly eject the acoustic silicone diaphragm 100 attached and formed in the boss hole 221, so as to unload the acoustic silicone diaphragm 100. In step S400, by setting the ejection jig 300 to unload the acoustic silicone diaphragm 100 attached and formed in the boss hole 221, it is possible to avoid contamination of the acoustic silicone diaphragm 100, improve the cleanliness of the acoustic silicone diaphragm 100, and thereby effectively ensure the performance of the acoustic silicone diaphragm 100.

[0071] In one embodiment of the present invention, Figures 11 to 14 As shown, the ejection fixture 300 includes a positioning plate 310, a force plate 320, a movable plate 330, a guide column 340, a return spring 350 and an ejection column 360; the guide column 340 is vertically connected to the positioning plate 310, the return spring 350 is sleeved outside the guide column 340, the movable plate 330 is provided with a sliding hole 331 corresponding to the position of the guide column 340, the guide column 340 penetrates the sliding hole 331, the movable plate 330 presses the return spring 350, the force plate 320 is arranged above the movable plate 330 and is locked and connected with the movable plate 330, A avoidance hole 321 is provided on the force plate 320 at a position corresponding to the guide column 340, and a limiting ring 322 is provided in the avoidance hole 321, which is locked with the guide column 340 and pressed against the movable plate 330. The guide column 340 is locked with the limiting ring 322 by a fastener 323. The outer diameter of the limiting ring 322 is smaller than the aperture of the avoidance hole 321, so as to ensure that the force plate 320 can move up and down with the movable plate 330 without being restricted by the limiting ring 322. The ejection column 360 is connected to the movable plate 330, and the positioning plate 310 is provided with an ejection hole 311 for the ejection column 360 to pass through. Specifically, when using the ejection fixture 300 of the present embodiment, the positioning plate 310 is shifted to the top of the middle plate 220, and after pressing down the force plate 320, the movable plate 330 is forced to compress the return spring 350 with the guide column 340 as the guide, and drive the ejection column 360 to pass through the ejection hole 311, and finally contact the acoustic silicone diaphragm 100 adhered to the boss hole 221 through the end of the ejection column 360 until the acoustic silicone diaphragm 100 is ejected from the boss hole 221. After the pressure on the force plate 320 is released, under the action of the return spring 350, the movable plate 330 is lifted up and reset, and the movable plate 330 drives the force plate 320 connected thereto to rise and reset, so that the ejection column 360 rises and resets, waiting for the next ejection work.

[0072] Furthermore, combined with Fig.14 As shown, the top of the ejector column 360 is provided with a side-extending protrusion 361, and the movable plate 330 is provided with a sinking hole 332. The ejector column 360 passes through the sinking hole 332 from top to bottom, so that the protrusion 361 is hung in the sinking hole 332, thereby preventing the ejector column 360 from completely passing through the sinking hole 332. Then, the force plate 320 is covered on the top of the movable plate 330 so that it is locked and connected with the movable plate 330, for example, by screw locking, so that the movable plate 330, the force plate 320 and the ejector column 360 are assembled.

[0073] In other embodiments, in combination Figures 13-14As shown, a limiting height column 390 is further provided on the positioning plate 310 below the movable plate 330. The setting of the limiting height column 390 can ensure that the downward movement height of the movable plate 330 has a bottom line, thereby preventing excessive force from acting on the force plate 320, causing the ejection column 360 to instantly rush out of the ejection hole 311 and hit other components such as the middle plate 220, thereby effectively reducing work accidents during the unloading process.

[0074] In one embodiment of the present invention, Figures 12-14 As shown, a flexible column 370 for flexibly contacting the middle plate 220 is provided at the bottom of the positioning plate 310; the provision of the flexible column 370 can avoid the positioning plate 310 from making hard contact with the middle plate 220, thereby preventing the two from being damaged by collision.

[0075] Furthermore, combined with Fig.11 As shown, a positioning plate handle 380 is provided on the top of the positioning plate 310. By holding the positioning plate handle 380, the staff can lift the entire ejection fixture 300 to facilitate the operation of the ejection process.

[0076] In one embodiment of the present invention, Figures 4-5 As shown, the silicone connection ring 130 includes a U-shaped portion 131 and a first bite portion 132 and a second bite portion 133 connecting the two free ends of the U-shaped portion 131. The first bite portion 132 is formed with a first bite groove for bite connection with the plastic basin frame 110, and the second bite portion 133 is formed with a second bite groove for bite connection with the PEN sheet 120. The U-shaped portion 131 formed in the silicone connection ring 130 has a spring property effect, that is, the setting of the U-shaped portion 131 enables the first bite portion 132 and the second bite portion 133 connected at both ends thereof to be compressed toward the groove side of the U-shaped portion 131, and the U-shaped portion 131 can also react a restoring force to the compressed first bite portion 132 and the second bite portion 133, so that the PEN sheet 120 can achieve more flexible activities in the plastic spraying, and the vibration freedom of the PEN sheet 120 is improved.

[0077] Furthermore, the U-shaped portion 131, the first bite portion 132 and the second bite portion 133 are integrally injection molded through the above step S200. Figure 5As shown, the shape of the first bite groove of the first bite portion 132 is consistent with the shape of the adjacent side of the plastic basin frame 110, and the two are connected together by bite injection molding, and the stability is very reliable; similarly, the shape of the second bite groove of the second bite portion 133 is consistent with the shape of the adjacent side of the PEN sheet 120, and the two are connected together by bite injection molding, and the stability is also very reliable. In this way, the plastic basin frame 110 and the PEN sheet 120 are connected together firmly and reliably through the silicone connecting ring 130, ensuring that the acoustic silicone diaphragm 100 can be used for a long time, and the high-frequency vibration of the PEN sheet 120 still has a long-lasting service life. In addition, the silicone connecting ring 130 can also ensure that the vibration frequency of the PEN sheet 120 is more coordinated and consistent, thereby ensuring the acoustic performance of the acoustic silicone diaphragm 100.

[0078] In one embodiment of the present invention, at least one side of the periphery of the second engaging portion 133 and the PEN sheet 120 is formed with a draft bevel 1331. Specifically, the draft bevel 1331 is preferably 45°, and the provision of the draft bevel 1331 can facilitate demoulding of the top template 230, thereby greatly reducing product quality problems such as debonding, glue overflow, gaps, unclear contours, etc., caused by demoulding between the PEN sheet 120 and the silicone connecting ring 130.

[0079] Preferably, if Figure 5 As shown, the draft bevel 1331 is formed at the upper end of the first bite portion 132, and the upper extension structure of the first bite groove formed by the first bite portion 132 is longer than the lower extension structure, which is more conducive to injection molding and demoulding.

[0080] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for manufacturing an acoustic silicone diaphragm, characterized in that: The following steps are involved: S100: providing a plastic basin frame and a PEN sheet, and placing the PEN sheet in the middle of the plastic basin frame so that an annular gap is formed between the PEN sheet and the plastic basin frame; S200: Injecting molten silicone raw material into the annular gap until a silicone connecting ring connecting the plastic basin frame and the PEN sheet is formed.

2. The method for manufacturing an acoustic silicone diaphragm according to claim 1, characterized in that: After the step S200, the method further includes step S300: injecting hot-melt silicone raw material onto the outer periphery of the plastic basin frame until a silicone waterproof ring attached to the plastic basin frame is formed.

3. The method for manufacturing an acoustic silicone diaphragm according to claim 2, characterized in that: In the step S100, an injection mold is provided, wherein the injection mold includes a bottom mold plate, a middle plate and a top mold plate; The bottom mold plate is provided with a plurality of boss bottom molds, a PEN sheet groove for placing the PEN sheet is formed in the middle of the boss bottom mold, a plastic basin frame groove for placing the plastic basin frame is formed on the periphery of the boss bottom mold, and a connecting ring groove is formed in the annular gap area between the PEN sheet groove and the plastic basin frame groove on the boss bottom mold; The middle plate is provided with boss holes matching the positions and shapes of the boss bottom molds, the middle plate cover is arranged on the bottom mold plate, the boss holes are respectively sleeved outside the boss bottom molds, and a waterproof ring groove is formed between the top edge of the boss hole and the plastic basin frame placed in the plastic basin frame groove; The top mold plate is provided with a positioning top mold whose position is matched with each of the boss bottom molds and whose shape is matched with the plastic basin frame and the PEN sheet located in the plastic basin frame. The top mold plate is covered on the middle plate, and each of the positioning top molds presses against the plastic basin frame and the PEN sheet corresponding to its position.

4. The method for manufacturing an acoustic silicone diaphragm according to claim 3, characterized in that: The injection mold also includes a support plate and positioning rods, and a plurality of vertically arranged positioning rods are connected to the support plate. The bottom template, the middle plate and the top template are respectively provided with bottom plate positioning holes, middle plate positioning holes and top plate positioning holes which correspond to each other in position and are sequentially provided for the positioning rods to pass through, and the support plate is supported on the bottom of the bottom template.

5. The method for manufacturing an acoustic silicone diaphragm according to claim 4, characterized in that: The middle plate has middle plate handles connected to two opposite sides thereof; and / or the top plate has top plate handles connected to two opposite sides thereof.

6. The method for manufacturing an acoustic silicone diaphragm according to claim 4, characterized in that: After the step S300, the method further includes a step S400: removing the top mold plate, lifting the middle plate, and using an ejection jig to contactlessly eject the acoustic silicone diaphragm attached and formed in the boss hole, thereby unloading the acoustic silicone diaphragm.

7. The method for manufacturing an acoustic silicone diaphragm according to claim 6, characterized in that: The ejection fixture comprises a positioning plate, a force application plate, a moving plate, a guide column, a return spring and an ejection column; The guide post is vertically connected to the positioning plate, the return spring is sleeved outside the guide post, the movable plate is provided with a sliding hole corresponding to the position of the guide post, the guide post penetrates the sliding hole, the movable plate presses the return spring, the force application plate is arranged above the movable plate and is locked with the movable plate, a position of the force application plate corresponding to the guide post is provided with an avoidance hole, a limiting ring is provided in the avoidance hole that is locked with the guide post and presses against the movable plate, the ejector post is connected to the movable plate, and the positioning plate is provided with an ejection hole for the ejector post to penetrate; The positioning plate is shifted to the top of the middle plate, and after pressing down the force plate, the movable plate is forced to compress the return spring guided by the guide column, and drive the ejection column to pass through the ejection hole, and finally contact the acoustic silicone diaphragm through the end of the ejection column until the acoustic silicone diaphragm is ejected from the boss hole.

8. The method for manufacturing an acoustic silicone diaphragm according to claim 7, characterized in that: A flexible column for flexibly contacting with the middle plate is arranged at the bottom of the positioning plate; and / or a positioning plate handle is arranged at the top of the positioning plate.

9. The method for manufacturing an acoustic silicone diaphragm according to claim 1, characterized in that: The silicone connecting ring includes a U-shaped portion and a first bite portion and a second bite portion connecting the two free ends of the U-shaped portion, the first bite portion forms a first bite groove that is bite-connected to the plastic basin frame, and the second bite portion forms a second bite groove that is bite-connected to the PEN sheet.

10. The method for manufacturing an acoustic silicone diaphragm according to claim 9, characterized in that: A draft slope is formed on at least one side of the periphery of the location where the second engaging portion engages with the PEN sheet.

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