Loudspeaker, acoustic silica gel vibrating diaphragm and injection mold thereof

Abstract

The utility model belongs to the technical field of loudspeakers, and particularly relates to a loudspeaker, an acoustic silica gel vibrating diaphragm and an injection mold thereof, the acoustic silica gel vibrating diaphragm comprises a plastic frame, a PEN sheet and a silica gel connecting ring, the PEN sheet is arranged in the middle of the plastic frame, and an annular gap is formed between the PEN sheet and the plastic frame; and the silica gel connecting ring is arranged in the annular gap and is connected with the plastic basin frame and the PEN sheet. According to the utility model, on one hand, the connection between the PEN sheet and the plastic basin stand is more stable, and even if the acoustic silica gel vibrating 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 utility model belongs to loudspeaker technical field especially relates to a loudspeaker, acoustic silica gel diaphragm and injection mold thereof. BACKGROUND

[0002] As a kind of component that can be converted into sound, loudspeaker is widely used in mobile phone, tablet computer, notebook computer, PDA and other terminal electronic equipment. Among them, loudspeaker diaphragm in loudspeaker plays a key role for sound quality of loudspeaker. Among them, the existing loudspeaker diaphragm is PEN sheet (PEN is the abbreviation of polyethylene naphthalate) connected on plastic support, then is connected on other components of loudspeaker through plastic support to realize installation.

[0003] However, the loudspeaker diaphragm with the above structure has two problems: first, water leakage problem is prone to occur at the connection between plastic support and other components of loudspeaker, and the sealing performance is poor, and the waterproof level is low; second, the PEN sheet is directly connected with plastic support, and the firmness and stability are poor, and with the extension of use time, the PEN sheet is vibrated frequently in actual working process, so that the PEN sheet is disconnected with plastic support; more importantly, the direct connection between PEN sheet and plastic support also affects the vibration frequency of PEN sheet, and further causes the acoustic effect of loudspeaker diaphragm to be poor. SUMMARY

[0004] The utility model aims at providing a kind of loudspeaker, acoustic silica gel diaphragm and injection mold thereof, to at least one of the above technical problems of loudspeaker diaphragm in prior art can be solved.

[0005] To achieve the above purpose, the utility model embodiment provides a kind of acoustic silica gel diaphragm, comprising:

[0006] Plastic basin frame;

[0007] PEN sheet, the PEN sheet is arranged in the middle of the plastic basin frame, and annular gap is formed between the PEN sheet and the plastic basin frame;

[0008] Silica gel connecting ring, the silica gel connecting ring is arranged in the annular gap and connects the plastic basin frame with the PEN sheet.

[0009] Optionally, by injection molding silica gel raw material to the annular gap, silica gel connecting ring connecting the plastic basin frame with the PEN sheet is formed

[0010] Optionally, the acoustic silica gel diaphragm further comprises silica gel waterproof ring, and the silica gel waterproof ring is attached to the outer peripheral surface of the plastic basin frame.

[0011] Optionally, the waterproof silicone ring is formed by injecting hot-melt silicone material to the outer periphery of the plastic basin frame.

[0012] Optionally, the silicone connecting ring comprises a U-shaped portion and a first clamping portion and a second clamping portion connecting two free ends of the U-shaped portion, the first clamping portion is formed with a first clamping groove for clamping connection with the plastic basin frame, and the second clamping portion is formed with a second clamping groove for clamping connection with the PEN sheet.

[0013] Optionally, at least one side periphery of the second clamping portion at the clamping connection with the PEN sheet is formed with a draft angle.

[0014] The utility model also provides a kind of injection mould for forming above-mentioned acoustic silicone diaphragm, it includes bottom die plate, intermediate plate and top die plate;

[0015] A plurality of boss bottom dies are provided on the bottom die plate, a PEN sheet groove for placing the PEN sheet is formed in the middle part of the boss bottom die, a plastic basin frame groove for placing the plastic basin frame is formed in the outer periphery of the boss bottom die, and a connecting ring groove is formed in the annular gap region between the PEN sheet groove and the plastic basin frame groove on the boss bottom die;

[0016] A plurality of boss holes are provided on the intermediate plate and matched with the position and shape of each boss bottom die, the intermediate plate is covered on the bottom die plate, each boss hole is respectively sleeved outside each boss bottom die, 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;

[0017] Positioning top dies matched with each boss bottom die in position and matched with the plastic basin frame and the PEN sheet placed in the plastic basin frame in shape are provided on the top die plate, the top die plate is covered on the intermediate plate, and each positioning top die respectively presses the plastic basin frame and the PEN sheet corresponding to its position.

[0018] Optionally, the injection mould further comprises a support plate and a positioning rod, a plurality of positioning rods are connected on the support plate and arranged vertically, the bottom die plate, the intermediate plate and the top die plate are respectively provided with bottom plate positioning holes, middle plate positioning holes and top plate positioning holes matched one by one in position and sequentially for the positioning rods to pass through, and the support plate is supported at the bottom of the bottom die plate.

[0019] Optionally, opposite sides of the intermediate plate are respectively connected with middle plate handles, and / or opposite sides of the top die plate are respectively connected with top plate handles.

[0020] The utility model further provides a loudspeaker comprising the above-mentioned acoustic silicone diaphragm.

[0021] The speaker, acoustic silicone diaphragm, and injection mold provided in this utility model embodiment have at least one of the following technical effects: In the manufacturing method of the acoustic silicone diaphragm of this utility model, a PEN sheet is placed in the middle of a plastic frame, forming an annular gap between the PEN sheet and the plastic frame. Then, a silicone connecting ring connecting the plastic frame and the PEN sheet is formed at the annular gap by injection molding molten silicone raw material, thus forming the acoustic silicone diaphragm. With this structure, the acoustic silicone diaphragm is connected to the PEN sheet and the plastic frame through a silicone connecting ring. This makes the connection between the PEN sheet and the plastic frame more stable, preventing the connection from detaching even after prolonged, high-frequency use. Furthermore, the silicone connecting ring ensures a more regular and reliable vibration frequency of the PEN sheet, resulting in a more reliable acoustic effect. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A flowchart illustrating the manufacturing method of the acoustic silicone diaphragm provided in this embodiment of the present invention.

[0024] Figure 2 A schematic diagram of the acoustic silicone diaphragm provided in an embodiment of this utility model.

[0025] Figure 3 for Figure 2 A schematic diagram of the exploded structure of the acoustic silicone diaphragm.

[0026] Figure 4 for Figure 3 A cross-sectional view of the acoustic silicone diaphragm.

[0027] Figure 5 for Figure 4 A partial cross-sectional view of the acoustic silicone diaphragm.

[0028] Figure 6 A schematic diagram of the injection mold for the acoustic silicone diaphragm provided in this embodiment of the utility model.

[0029] Figure 7 for Figure 6 A structural exploded view of the injection mold.

[0030] Figure 8for Figure 6 A schematic diagram of the bottom template of the injection mold.

[0031] Figure 9 for Figure 8 A magnified view of the local structure at point A in the middle.

[0032] Figure 10 for Figure 6 A schematic diagram of the top platen of the injection mold.

[0033] Figure 11 A schematic diagram of the ejection fixture provided in step S400 of the method for manufacturing an acoustic silicone diaphragm according to an embodiment of the present invention.

[0034] Figure 12 for Figure 11 A structural schematic diagram of the ejector fixture from another perspective.

[0035] Figure 13 for Figure 11 A sectional view of the ejector fixture in the middle.

[0036] Figure 14 for Figure 11 A structural exploded view of the ejector fixture.

[0037] The following are the labeling elements in the figure:

[0038] 100—Acoustic silicone diaphragm; 110—Plastic frame; 120—PEN sheet

[0039] 130—Silicone connecting ring; 131—U-shaped part; 132—First engagement part

[0040] 133—Second engagement part; 140—Silicone waterproof ring; 1331—Draft bevel surface; 1331

[0041] 200—Injection mold; 210—Bottom mold plate; 211—Boss bottom mold

[0042] 212—Base plate positioning hole; 220—Intermediate plate; 221—Boss hole

[0043] 222—Middle plate positioning hole; 223—Middle plate handle; 230—Top template

[0044] 231—Positioning mold; 232—Top plate positioning hole; 233—Top plate handle

[0045] 240—Support plate 250—Positioning rod 2111—PEN plate slot

[0046] 2112—Plastic basin holder groove; 2113—Connecting ring groove; 300—Ejection fixture

[0047] 310 positioning plate 311 ejection hole 320 force plate

[0048] 321 avoidance hole 322 limit ring 323 fastener

[0049] 330 moving plate 331 sliding hole 332 sinking hole

[0050] 340 guide column 350 return spring 360 ejection column

[0051] 361 protruding block 370 flexible column 380 positioning plate handle

[0052] 390 height limiting column. DETAILED DESCRIPTION

[0053] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The following describes the embodiments of the present application by referring to the accompanying drawings. Figures 1-14 The described embodiments are exemplary, and are intended to be illustrative of the embodiments of the present application, and are not to be construed as limiting the present application.

[0054] In the description of the embodiments of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the embodiments of the present application and simplify the description, and therefore cannot be construed as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application.

[0055] In addition, the terms "first", "second" are used only for descriptive purposes, and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0056] In the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0057] In one embodiment of the present application, as shown in Figures 1-5 An acoustic silica gel diaphragm 100 is provided, which comprises a plastic basin frame 10, a PEN sheet 20 and a silica gel connecting ring 30, the PEN sheet 20 is arranged in the middle of the plastic basin frame 10, and an annular gap (not shown in the figure) is formed between the PEN sheet 20 and the plastic basin frame 10; the silica gel connecting ring 30 is arranged in the annular gap and connects the plastic basin frame 10 and the PEN sheet 20. The acoustic silica gel diaphragm 100 of the embodiment is made by the following manufacturing method, wherein the manufacturing method comprises the following steps:

[0058] S100: providing a plastic basin frame 110 and a PEN sheet 120, 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;

[0059] S200: injecting molten silica gel raw material into the annular gap until the silica gel connecting ring 130 connecting the plastic basin frame 110 and the PEN sheet 120 is formed.

[0060] In the acoustic silica gel diaphragm 100 provided by the embodiment of the present application, the 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 the silica gel connecting ring 130 connecting the plastic basin frame 110 and the PEN sheet 120 is formed in the annular gap by the injection molding of the molten silica gel raw material, thereby forming the acoustic silica gel diaphragm 100. The acoustic silica gel diaphragm 100 with such structure is connected between the PEN sheet 120 and the plastic basin frame 110 by the silica gel connecting ring 130 made of silica gel material, so that on the one hand, the connection between the PEN sheet 120 and the plastic basin frame is more stable, and even if the acoustic silica gel 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 silica gel connecting ring 130 makes the vibration frequency of the PEN sheet 120 more regular and reliable, and the acoustic effect produced is more reliable.

[0061] Further see Figure 1In an embodiment of the utility model, after the step S200, still include step S300: injection molding hot melt silica gel raw materials to the outer periphery of the plastic basin frame 110 until the silica gel waterproof ring 140 that forms attachment on the plastic basin frame 110. This embodiment further injection molding a circle of silica gel waterproof ring 140 on the outer periphery of the plastic basin frame 110, compared with the plastic basin frame 110, the silica gel waterproof ring 140 material is softer, then when connecting the entire acoustic silica gel diaphragm 100 with other components on the loudspeaker, can fill the assembly gap, prevent water leakage, reach high sealing performance, improve the waterproof level of acoustic silica gel diaphragm 100.

[0062] In an embodiment of the utility model, in the step S100, provide injection mold 200, see Figure 6 , the injection mold 200 includes bottom plate 210, middle plate 220 and top die plate 230. The injection mold 200 in this embodiment is mainly formed by three plate parts of bottom plate 210, middle plate 220 and top die plate 230.

[0063] Further, see Figures 7-10 , the bottom plate 210 is provided with several boss bottom die 211, the middle part of the boss bottom die 211 forms the PEN sheet slot 2111 for placing the PEN sheet 120, the outer periphery of the boss bottom die 211 forms the plastic basin frame slot 2112 for placing the plastic basin frame 110, and the annular gap area between the PEN sheet slot 2111 and the plastic basin frame slot 2112 on the boss bottom die 211 forms the connecting ring slot 2113. Then on the bottom plate 210, the PEN sheet 120 can be placed in the PEN sheet slot 2111 first, and the plastic basin frame 110 is placed in the plastic basin frame slot 2112, so that the PEN sheet 120 is located in the middle of the plastic basin frame 110, and the space of the injection cavity for the subsequent injection molding silica gel connecting ring 130 is provided.

[0064] Further, see Figures 7-9 , the middle plate 220 is provided with boss hole 221 matched with the position and shape of each boss bottom die 211, the middle plate 220 is arranged on the bottom plate 210, each boss hole 221 is respectively sleeved outside each boss bottom die 211, and the top edge of the boss hole 221 and the plastic basin frame 110 placed in the plastic basin frame slot 2112 form a waterproof ring groove. Each boss hole 221 on the middle plate 220 is sleeved on each boss bottom die 211 on the bottom plate 210, and the two are matched, and the top edge of the boss hole 221 and the plastic basin frame 110 placed in the plastic basin frame slot 2112 form a waterproof ring groove, the formation of the waterproof ring groove provides the space of the injection cavity for the injection molding silica gel waterproof ring 140, and the structure design is ingenious.

[0065] Further, seen from Figure 10 The top die plate 230 is provided with positioning top dies 231 which are matched with the bosses 211 in position and matched with the plastic basin frame 110 and the PEN sheet 120 in the plastic basin frame 110 in shape, the top die plate 230 is arranged on the middle plate 220, and the positioning top dies 231 are respectively pressed against the plastic basin frame 110 and the PEN sheet 120 corresponding in position. Specifically, after the top die plate 230 is arranged, the top die plate 230, the middle plate 220 and the bottom die plate 210 are combined, and the inside of the injection mold 200 forms an injection cavity which is matched with the shape of the silica gel connecting ring 130 and the silica gel waterproof ring 140. Then, the injection hole arranged on the top die plate 230 is used to inject the molten silica gel raw material, and the silica gel connecting ring 130 and the silica gel waterproof ring 140 are injection molded, and then the plastic basin frame 110 and the PEN sheet 120 placed on the boss bottom die 211 form the acoustic silica gel diaphragm 100.

[0066] In an embodiment of the utility model, seen from Figures 6-7 The injection mold 200 further comprises a support plate 240 and positioning rods 250, the support plate 240 is connected with a plurality of positioning rods 250 arranged vertically, the bottom die plate 210, the middle plate 220 and the top die plate 230 are respectively provided with bottom plate positioning holes 212, middle plate positioning holes 222 and top plate positioning holes 232 which are matched one by one in position and sequentially used for the positioning rods 250 to pass through, and the support plate 240 is supported at the bottom of the bottom die plate 210. Specifically, the support plate 240 provides installation support for the bottom die plate 210, and the positioning rods 250 are further arranged on the support plate 240. Then, the bottom plate positioning holes 212, the middle plate positioning holes 222 and the top plate positioning holes 232 are sequentially arranged on the bottom die plate 210, the middle plate 220 and the top die plate 230 for the positioning rods 250 to pass through. In this way, the bottom die plate 210, the middle plate 220 and the top die plate 230 are stacked on the support plate 240, and the precise positioning and combination of the injection mold 200 are realized.

[0067] In an embodiment of the utility model, seen from Figures 6-7 The opposite sides of the middle plate 220 are respectively connected with middle plate handles 223. Through the arrangement of the middle plate handles 223, the staff can easily lift the middle plate 220, because the acoustic silica gel diaphragm 100 is still adhered in the boss hole 221 on the middle plate 220 after the injection molding is completed. The staff can conveniently unload the acoustic silica gel diaphragm 100 by holding the middle plate handle 223 and moving it to a suitable position.

[0068] Further, seen from Figures 6-7The opposite sides of the top die plate 230 are respectively connected with top plate handles 233. The top plate handles 233 are arranged for facilitating the workers to open or cover the top die plate 230. Of course, the top plate handles 233 are preferably arranged to be dislocated with the middle plate handles 223 at least in the position, so as to avoid the assembly interference.

[0069] In one embodiment of the present application, in combination with Figure 1 and 11 As shown in the step S300, after the step S300, the method further comprises a step S400: removing the top die plate 230, lifting the middle plate 220, and using the ejection jig 300 to non-contact ejection the acoustic silica gel diaphragm 100 attached and formed in the boss hole 221, so as to realize the unloading of the acoustic silica gel diaphragm 100. In the step S400, the ejection jig 300 is arranged to unload the acoustic silica gel diaphragm 100 attached and formed in the boss hole 221, so as to avoid the pollution of the acoustic silica gel diaphragm 100, improve the cleanliness of the acoustic silica gel diaphragm 100, and effectively ensure the performance of the acoustic silica gel diaphragm 100.

[0070] In one embodiment of the present application, in combination with Figures 11-14As shown, the ejection jig 300 comprises a positioning plate 310, a force applying plate 320, a moving 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 moving plate 330 is provided with a sliding hole 331 corresponding to the position of the guide column 340, the guide column 340 penetrates into the sliding hole 331, the moving plate 330 abuts against the return spring 350, the force applying plate 320 is arranged above the moving plate 330 and is locked and connected with the moving plate 330, the force applying plate 320 is provided with an avoiding hole 321 corresponding to the position of the guide column 340, the avoiding hole 321 is provided with a limiting ring 322 locked with the guide column 340 and abutting against the moving plate 330, the guide column 340 is locked with the limiting ring 322 through a fastener 323, the outer diameter of the limiting ring 322 is smaller than the hole diameter of the avoiding hole 321, so that the force applying plate 320 can move up and down with the moving plate 330 and is not limited by the limiting ring 322, the ejection column 360 is connected to the moving plate 330, and the positioning plate 310 is provided with an ejection hole 311 for the ejection column 360 to penetrate out. Specifically, when the ejection jig 300 of the embodiment is used, the positioning plate 310 is moved to above the middle plate 220, the force applying plate 320 is pressed down, the moving plate 330 is forced to compress the return spring 350 with the guide column 340 as a guide, and the ejection column 360 is driven to penetrate out of the ejection hole 311, finally the end of the ejection column 360 contacts the acoustic silica gel diaphragm 100 adhered in the boss hole 221, until the acoustic silica gel diaphragm 100 is ejected from the boss hole 221, after the pressure on the force applying plate 320 is released, the moving plate 330 is lifted and reset under the action of the return spring 350, the moving plate 330 drives the force applying plate 320 connected thereto to rise and reset, so that the ejection column 360 rises and resets, and the next ejection work is waited.

[0071] Further, in combination with Figure 14 As shown, the top end of the ejection column 360 is provided with a side extending lug 361, the moving plate 330 is provided with a sunken hole 332, the ejection column 360 penetrates out of the sunken hole 332 in the upward direction, so that the lug 361 is hung in the sunken hole 332, thereby preventing the ejection column 360 from penetrating through the sunken hole 332 completely, then the force applying plate 320 is arranged above the moving plate 330 and is locked and connected with the moving plate 330, for example, locked by screws, so that the moving plate 330, the force applying plate 320 and the ejection column 360 are assembled.

[0072] In other embodiments, in combination with Figures 13-14As shown, a height limiting column 390 is arranged below the moving plate 330 on the positioning plate 310, and the arrangement of the height limiting column 390 can ensure that the moving height of the moving plate 330 has a bottom line, so that the force acting on the pressing plate 320 is not too large, and the ejection column 360 is not instantaneously ejected from the ejection hole 311 to hit other components such as the intermediate plate 220, thereby effectively reducing work accidents in the unloading process.

[0073] In an embodiment of the present application, in combination with Figures 12-14 As shown, the bottom of the positioning plate 310 is provided with a flexible column 370 for flexible contact with the intermediate plate 220; the arrangement of the flexible column 370 can avoid hard contact between the positioning plate 310 and the intermediate plate, and prevent collision damage between the two.

[0074] Further, in combination with Figure 11 As shown, the top of the positioning plate 310 is provided with a positioning plate handle 380. By holding the positioning plate handle 380, the worker can lift the entire ejection jig 300, facilitating the operation of the ejection process.

[0075] In an embodiment of the present application, in combination with Figures 4-5 As shown, the silica gel connecting ring 130 includes a U-shaped part 131, and a first clamping part 132 and a second clamping part 133 connecting two free ends of the U-shaped part 131, the first clamping part 132 is formed with a first clamping groove for clamping connection with the plastic basin frame 110, and the second clamping part 133 is formed with a second clamping groove for clamping connection with the PEN sheet 120. Among them, the U-shaped part 131 formed in the silica gel connecting ring 130 has a spring attribute effect, that is, the arrangement of the U-shaped part 131 makes the first clamping part 132 and the second clamping part 133 connected at both ends of the U-shaped part 131 can be compressed to the side of the groove of the U-shaped part 131, and the U-shaped part 131 can also react a resetting force to the compressed first clamping part 132 and the second clamping part 133, so that the PEN sheet 120 can realize flexible movement in the plastic glue spraying, and the vibration freedom degree of the PEN sheet 120 is improved.

[0076] Further, the U-shaped part 131, the first clamping part 132 and the second clamping part 133 are integrally injection molded through the above step S200, in combination with Figure 5As shown, the first engagement groove shape of the first engagement part 132 is consistent with the shape of the adjacent side of the plastic basin frame 110, and the two are engaged and injection molded together, which is very reliable in stability; similarly, the second engagement groove shape of the second engagement part 133 is consistent with the shape of the adjacent side of the PEN sheet 120, and the two are engaged and injection molded together, which is also very reliable in stability. In this way, the plastic basin frame 110 and the PEN sheet 120 are connected together by the silica gel connecting ring 130, which is firm and reliable, ensuring that the acoustic silica gel diaphragm 100 formed has a long service life, and the PEN sheet 120 still has a long service life for high-frequency vibration. Moreover, the silica gel connecting ring 130 can also ensure that the vibration frequency of the PEN sheet 120 is more coordinated and consistent, ensuring the acoustic performance of the acoustic silica gel diaphragm 100.

[0077] In an embodiment of the present application, at least one side periphery of the second engagement part 133 and the PEN sheet 120 engagement connection is formed with a draft angle 1331. Specifically, the draft angle 1331 is preferably 45°, and the provision of the draft angle 1331 can facilitate the demolding of the mold plate 230, which can greatly reduce the product quality problems such as delamination, glue overflow, notches, and unclear contours that exist between the PEN sheet 120 and the silica gel connecting ring 130 due to demolding.

[0078] Preferably, as Figure 5 As shown, the draft angle 1331 is formed on the upper end of the first engagement part 132, and the first engagement groove formed by the first engagement part 132 has a longer upper side extension structure than a lower side extension structure, which is more conducive to injection molding demolding.

[0079] In an embodiment of the present application, a loudspeaker is provided, which includes the above-mentioned acoustic silica gel diaphragm.

[0080] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An acoustic silica gel diaphragm, characterized in that, The application relates to an acoustic silicon-rubber diaphragm, which comprises the following parts: a plastic frame; a PEN sheet arranged in the middle of the plastic frame, and an annular gap formed between the plastic frame and the PEN sheet; a silicon-rubber connecting ring arranged in the annular gap and connecting the plastic frame and the PEN sheet.

2. The acoustic silicone diaphragm of claim 1, wherein, The silicon-rubber connecting ring is formed by injecting a silicon-rubber raw material into the annular gap.

3. The acoustic silicone diaphragm of claim 1, wherein, The application further comprises: a silicon-rubber waterproof ring attached to the outer circumferential surface of the plastic frame.

4. The acoustic silicone diaphragm of claim 3, wherein, The silicon-rubber waterproof ring is formed by injecting a hot-melt silicon-rubber raw material into the outer circumferential surface of the plastic frame.

5. The acoustic silicone diaphragm of claim 1, wherein, The silicon-rubber connecting ring comprises a U-shaped part and a first clamping part and a second clamping part connecting the two free ends of the U-shaped part, the first clamping part is provided with a first clamping groove for clamping the plastic frame, and the second clamping part is provided with a second clamping groove for clamping the PEN sheet.

6. The acoustic silicone diaphragm of claim 5, wherein, At least one side circumferential edge of the second clamping part for clamping the PEN sheet is provided with a demoulding slope.

7. An injection mold for molding the acoustic silicone diaphragm according to any one of claims 1 to 6, characterized in that The injection mould comprises a bottom mould plate, an intermediate plate and a top mould plate; the bottom mould plate is provided with a plurality of boss bottom moulds, the middle part of each boss bottom mould is provided with a PEN sheet groove for placing the PEN sheet, the outer circumferential surface of each boss bottom mould is provided with a plastic frame groove for placing the plastic frame, and the annular gap region between the PEN sheet groove and the plastic frame groove of each boss bottom mould is provided with a connecting ring groove; the intermediate plate is provided with a plurality of boss holes matched with the positions and shapes of the boss bottom moulds, the intermediate plate is arranged on the bottom mould plate, each boss hole is arranged outside each boss bottom mould, and the top edge of each boss hole is provided with a waterproof ring groove between the plastic frame placed in the plastic frame groove; the top mould plate is provided with a plurality of positioning top moulds matched with the positions of the boss bottom moulds and matched with the shapes of the plastic frame and the PEN sheet placed in the plastic frame, the top mould plate is arranged on the intermediate plate, and each positioning top mould is arranged to press against the plastic frame and the PEN sheet corresponding to the position of the positioning top mould.

8. The injection mold for an acoustic silicone eardrum of claim 7, wherein, The injection mould further comprises a support plate and a plurality of positioning rods arranged vertically on the support plate, the bottom mould plate, the intermediate plate and the top mould plate are respectively provided with a plurality of bottom plate positioning holes, intermediate plate positioning holes and top plate positioning holes matched one by one and in sequence for the positioning rods to pass through, and the support plate is arranged on the bottom of the bottom mould plate.

9. The injection mold for an acoustic silicone eardrum of claim 7, wherein, The opposite sides of the intermediate plate are respectively connected with intermediate plate handles, and / or the opposite sides of the top mould plate are respectively connected with top plate handles.

10. A loudspeaker, characterized by The application further relates to an acoustic silicon-rubber diaphragm comprising the diaphragm according to any one of claims 1 to 6.

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