Tail plug of Bluetooth earphone and manufacturing method thereof

Abstract

The invention discloses a tail plug of a Bluetooth earphone and a manufacturing method thereof, and the method comprises the steps: carrying out the punch forming of a metal sheet into a material strap which comprises a material strap plate and a plurality of electrodes connected to the material strap plate, and forming a pre-breaking point at the connection part of each electrode and the material strap plate; carrying out plating treatment on the material strip; the two material belts subjected to coating treatment are placed at set positions of an injection mold correspondingly; a plastic body of the tail plug is formed on every two corresponding electrodes on the two material belts in an injection molding mode; and separating each tail plug from the material belt plate from each pre-breaking point. The production cost is reduced, the production efficiency is improved, and batch production is facilitated.

Description

Technical Field

[0001] The present application relates to the field of structural manufacturing of wearable smart products, and in particular to a tail plug of a Bluetooth headset and a manufacturing method thereof. Background Art

[0002] TWS tail plug, that is, the tail plug of True Wireless Stereo headphones, is an important component of TWS headphones. TWS tail plug is usually located at the bottom or handle of the earphone. It has various designs and functions. For example, a charging port and microphone opening can be set on it for wireless charging and calls of TWS headphones.

[0003] In the prior art, the overall manufacturing process of the TWS tail plug usually involves turning a brass substrate into an electrode, then performing surface coating on the electrode; then injection molding a plastic body separately; and finally assembling the electrode and the plastic body into a TWS tail plug.

[0004] However, during the assembly process, the electrodes and plastic bodies need to be glued, welded, and cold pressed. Therefore, there are problems such as high electrode turning and assembly costs, low production efficiency, and inconvenience for mass production. In addition to the tail plugs of TWS earphones, the tail plugs of some other types of Bluetooth earphones also have the same problem. Summary of the invention

[0005] The purpose of this application is to provide a tail plug for a Bluetooth headset and a manufacturing method thereof, which is conducive to reducing production costs, improving production efficiency, and facilitating mass production.

[0006] In order to achieve the above object, the present application provides a method for manufacturing a tail plug of a Bluetooth headset, comprising:

[0007] Stamping a metal sheet into a material strip, wherein the material strip comprises a material strip plate and a plurality of electrodes connected to the material strip plate, wherein a pre-breaking point is formed at a connection between each electrode and the material strip plate;

[0008] Plating the material strip;

[0009] Placing the two strips after coating treatment at set positions of the injection mold respectively;

[0010] Injection-molding a plastic body of a tail plug on each of the two electrodes corresponding to the two material strips;

[0011] Each tail plug is separated from the material strip plate from each pre-breaking point.

[0012] Optionally, the electrode includes a connecting portion and a bending portion injection-molded on the plastic body, one end of the connecting portion is connected to the strip plate through the pre-breaking point, the bending portion is formed by bending the other end of the connecting portion to one side, and the bending portion includes an inner wall and an outer wall facing and facing away from the side of the connecting portion, respectively, and the outer wall is a smooth curved surface; after the plastic body is molded on the electrode, the outer wall is exposed to the outside.

[0013] Optionally, two opposite side walls of the bending portion connected between the inner wall and the outer wall are respectively provided with buckles, and the buckles are injection-molded in the plastic body.

[0014] Optionally, the injection mold comprises a female mold core, a male mold core, a male mold insert, a positioning insert and a lateral slider;

[0015] A row of molding grooves is formed on the lower surface of the female mold core;

[0016] The lower end of the male mold insert is fixed to the male mold core, the upper surface of the male mold insert is in contact with the lower surface of the female mold core, and a row of molding convex parts are convexly provided on the upper surface of the male mold insert, and each molding convex part extends into each molding groove respectively;

[0017] The lower end of each positioning insert is fixed to the male mold core, two positioning inserts are respectively arranged on both sides of the male mold insert corresponding to each of the molding convex parts, an upwardly penetrating installation gap is formed between the positioning insert and the male mold insert, the strip plate is inserted downward into each of the installation gaps located on the same side of the male mold insert, and each of the electrodes at least partially extends into the corresponding molding groove;

[0018] The lateral sliders are respectively provided on the opposite sides of the male mold insert, and the lateral sliders are laterally slidably arranged between the female mold core and the male mold core. The lateral sliders are configured to push each of the positioning inserts to press the material strip board between the male mold insert and the positioning inserts after the material strip board is inserted into the installation gap.

[0019] Optionally, the male mold insert comprises an insert upper portion and an insert lower portion, two side surfaces of the insert lower portion extend outwardly beyond two side surfaces of the insert upper portion, a step surface is formed between the side surfaces of the insert lower portion and the corresponding side surfaces of the insert lower portion, and an end of the strip plate away from the electrode is configured to be supported on the step surface;

[0020] The step surface is provided with a positioning protrusion protruding upward, and the end of the strip plate away from the electrode is formed with a positioning notch adapted to the positioning protrusion; or

[0021] The step surface is concavely provided with a positioning notch, and the end of the strip plate away from the electrode is formed with a positioning convex portion adapted to the positioning notch.

[0022] Optionally, the end surface of the bending portion is configured to fit against the upper surface of the positioning insert, the upper surface of the bending portion partially fits against the lower surface of the female mold core, a positioning boss is protruding from the upper surface of the positioning insert, and a side wall of the positioning boss is configured to abut against the end of the inner wall of the bending portion.

[0023] Optionally, the end surface of the bending portion is configured to fit against the upper surface of the positioning insert, the upper surface of the bending portion partially fits against the lower surface of the female mold core, a positioning boss is protruding from the upper surface of the positioning insert, and a side wall of the positioning boss is configured to abut against the end of the inner wall of the bending portion.

[0024] Optionally, the positioning boss is configured to be inserted between the connecting portion and the bending portion.

[0025] Optionally, after the mold is closed, the side wall of the molding groove is attached to and over-presses the outer wall of the bending portion.

[0026] Optionally, the inner side wall of the lateral slider is respectively provided with positioning grooves corresponding to the positioning inserts in the same row, and when the inner side wall of the lateral slider is attached to the male mold insert, the positioning grooves are clamped on the positioning inserts.

[0027] In order to achieve the above-mentioned purpose, the present application also provides a tail plug of a Bluetooth headset, and the tail plug of the Bluetooth headset is manufactured by the manufacturing method of the tail plug of the Bluetooth headset as described above.

[0028] In the embodiment of the present application, the manufacturing method of the tail plug of the Bluetooth headset is to stamp a metal sheet into a material strip including a material strip plate and multiple electrodes, then perform a coating treatment on the material strip, finally place two material strips at the set position of the injection mold, cast the plastic body of the tail plug on the electrode, and finally separate the tail plug from the material strip plate from the pre-break point to obtain multiple independent tail plugs. This method first stamps out multiple electrodes connected to the same material strip plate, and then simultaneously injects a plastic body on each electrode, thereby eliminating the need to assemble the tail plugs individually, which is conducive to improving production efficiency, suitable for mass production, and also conducive to reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a flow chart of a method for manufacturing a tail plug of a Bluetooth headset according to an embodiment of the present application.

[0030] Figure 2 It is a schematic diagram of the three-dimensional structure of the material belt in the embodiment of the present application.

[0031] Figure 3 It is a schematic diagram of the three-dimensional structure of the electrode in the embodiment of the present application.

[0032] Figure 4 It is a schematic diagram of the three-dimensional structure of the injection mold in the embodiment of the present application.

[0033] Figure 5 This is a schematic diagram of the exploded structure of the injection mold in the embodiment of the present application.

[0034] Figure 6 It is a schematic diagram of the cross-sectional structure of the injection mold in the embodiment of the present application.

[0035] Figure 7 It is a schematic diagram of the three-dimensional structure of a cutout portion of the injection mold in an embodiment of the present application.

[0036] Figure 8 This is a schematic diagram of the exploded structure of a cutout portion of the injection mold in an embodiment of the present application.

[0037] Fig. 9 It is a schematic diagram of the three-dimensional structure of the male mold insert and the positioning insert in the embodiment of the present application.

[0038] Fig.10 It is a schematic diagram of the three-dimensional structure of the material strip, the male mold insert and the positioning insert in the embodiment of the present application.

[0039] Fig.11 This is a schematic diagram of a partial structure of the injection mold in an embodiment of the present application.

[0040] Fig.12 It is a schematic diagram of the three-dimensional structure of the material strip after injection molding in an embodiment of the present application.

[0041] Fig.13 It is a schematic diagram of the three-dimensional structure of the tail plug in the embodiment of the present application. DETAILED DESCRIPTION

[0042] In order to explain the technical content, structural features and achieved effects of the present application in detail, the following is a detailed description in combination with the implementation methods and the accompanying drawings.

[0043] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0044] See also Figures 1 to 13 The present application discloses a method for manufacturing a tail plug of a Bluetooth headset, comprising:

[0045] S1, stamping a metal sheet into a material strip 30, wherein the material strip 30 includes a material strip plate 31 and a plurality of electrodes 10 connected to the material strip plate 31, and a pre-breaking point 32 is formed at a connection between each electrode 10 and the material strip plate 31.

[0046] In a specific example, during each stamping process, ten electrodes 10 can be stamped out on each material strip 30. Each time stamping, at least eighty material strips 30 can be stamped out, and the stamping cycle is short, the efficiency is high, and the cost is low. This efficient production method can significantly improve production efficiency and reduce production costs.

[0047] See also Figure 2 and Figure 3 In some embodiments, the electrode 10 includes a connecting portion 12 and a bending portion 11 injection-molded on a plastic body 20, one end of the connecting portion 12 is connected to a material strip plate 31 through a pre-breaking point 32, and the bending portion 11 is formed by bending the other end of the connecting portion 12 toward one side, and the bending portion 11 includes an inner wall 111 and an outer wall 112 facing and facing away from the side of the connecting portion 12, respectively, and the outer wall 112 is a smooth curved surface; after the plastic body 20 is molded on the electrode 10, the outer wall 112 is exposed to the outside.

[0048] Specifically, the thickness of the connecting portion 12 and the bending portion 11 is 0.4 mm. Of course, the thickness of the connecting portion 12 of the present application is not limited thereto.

[0049] Specifically, the two opposite side walls 113 of the bent portion 11 connected between the inner wall 111 and the outer wall 112 are respectively provided with buckles 13, and during subsequent injection molding, the buckles 13 are injection molded into the plastic body 20. By means of the buckles 13 protruding outward, the electrode 10 of the tail plug 1 and the plastic body 20 can be more firmly combined when combined by injection molding.

[0050] More specifically, the thickness of the buckle position 13 is greater than 0.15 mm. Of course, the thickness of the buckle position 13 of the present application is not limited thereto.

[0051] S2, performing a coating process on the material strip 30.

[0052] In order to improve the surface properties of the alloy material (such as corrosion resistance, aesthetics, etc.), one or more layers of other metals or alloys will be plated on the surface of the electrode 10. The material of the coating and the thickness of the coating can be selected according to the use environment and performance requirements of the tail plug 1.

[0053] S3, placing the two plated strips 30 at set positions of the injection mold 40 respectively.

[0054] See also Figures 4 to 11In some embodiments, the injection mold 40 includes a female mold core 41, a male mold core 42, a male mold insert 43, a positioning insert 44, and a lateral slider 45. A row of molding grooves 411 are formed on the lower surface of the female mold core 41. The lower end of the male mold insert 43 is fixed to the male mold core 42. The upper surface of the male mold insert 43 is in contact with the lower surface of the female mold core 41. A row of molding protrusions 431 are convexly provided on the upper surface of the male mold insert 43. Each molding protrusion 431 extends into each molding groove 411. The lower end of each positioning insert 44 is fixed to the male mold core 42. Two positioning inserts 44 are respectively provided on both sides of the male mold insert 43 corresponding to each molding protrusion 431. An upwardly penetrating installation gap 46 is formed between the positioning insert 44 and the male mold insert 43. The strip plate 31 is inserted downward into each installation gap 46 located on the same side of the male mold insert 43. Each electrode 10 at least partially extends into the corresponding molding groove 411. Lateral sliders 45 are respectively provided on the opposite sides of the male mold insert 43, and the lateral sliders 45 are laterally slidably arranged between the female mold core 41 and the male mold core 42. The lateral sliders 45 are configured to push each positioning insert 44 to press the material strip plate 31 between the male mold insert 43 and the positioning insert 44 after the material strip plate 31 is inserted into the installation gap 46.

[0055] It should be noted that, in the specific example of the present application, the lower portion of the connecting portion 12 is also installed in the installation gap 46 .

[0056] Specifically, the male mold insert 43 includes an insert upper portion 432 and an insert lower portion 433. The two side surfaces of the insert lower portion 433 extend outwardly beyond the two side surfaces of the insert upper portion 432. A step surface 434 is formed between the side surfaces of the insert lower portion 433 and the corresponding side surfaces of the insert lower portion 433. The end of the strip plate 31 away from the electrode 10 is configured to be supported on the step surface 434.

[0057] In some embodiments, the step surface 434 is provided with a positioning protrusion 435 protruding upward, and a positioning notch 33 matching the positioning protrusion 435 is formed at one end of the strip plate 31 away from the electrode 10. Of course, it is not limited thereto, and in other embodiments, the step surface 434 may also be provided with a positioning notch concave downward, and a positioning protrusion matching the positioning notch is formed at one end of the strip plate 31 away from the electrode 10.

[0058] It is understandable that the positioning protrusion and the positioning notch are matched, and if one of the step surface 434 and the strip is formed with a positioning protrusion, the other is formed with a positioning notch. By matching the positioning protrusion and the positioning notch, the strip plate 31 can be accurately positioned in the installation gap 46.

[0059] Specifically, between the positioning insert 44 and the male mold insert 43, the installation gap 46 can leave extra width while allowing the strip plate 31 to be placed. In a specific example, the width of the installation gap 46 can be 0.03mm larger than the thickness of the strip plate 31 to facilitate placement by the robot. After the strip 30 is placed, the lateral sliders 45 on both sides are pushed to apply pressure to the middle and break against the male mold insert 43, so that the strip plate 31 and the side wall of the male mold insert 43 fit tightly, which is conducive to avoiding the occurrence of gap glue leakage during injection molding.

[0060] Specifically, the end face of the bending portion 11 is configured to fit on the upper surface of the positioning insert 44, the upper surface of the positioning insert 44 partially fits on the lower surface of the female mold core 41, and the upper surface of the positioning insert 44 is convexly provided with a positioning boss 441, and a side wall of the positioning boss 441 is configured to abut the end of the inner wall 111 of the bending portion 11. The end face of the bending portion 11 fits on the upper surface of the positioning insert 44, which can ensure that the corresponding position does not leak plastic, and the side wall of the positioning boss 441 supports the bending portion 11, which can prevent the bending portion 11 from deforming.

[0061] Specifically, the positioning boss 441 is configured to be inserted between the connecting portion 12 and the bending portion 11 .

[0062] Specifically, the positioning boss 441 includes a first boss 442 and a second boss 443 connected in a stepped shape, the side wall of the first boss 442 is configured to abut the end of the inner wall 111 of the bending portion 11, the second boss 443 is higher than the first boss 442, and the side wall of the second boss 443 abuts the side wall of the connecting portion 12. In the specific example, the height of the first step 442 is 0.2 mm. Of course, the shape of the positioning boss 441 is not limited thereto.

[0063] In some embodiments, the inner wall of the lateral slider 45 is provided with positioning grooves 451 corresponding to each positioning insert 44 in the same row. When the inner wall of the lateral slider 45 is attached to the male mold insert 43 , the positioning grooves 451 are stuck on the positioning insert 44 .

[0064] In a specific example, molding notches 452 are formed at two outer edge corners of the top end of the positioning groove 451, and the edge lines of the molding notches 452 of the two lateral sliders 45 coincide with the edge lines of the first molding groove 436 and the second molding groove 437, so as to form an injection molding cavity together with the positioning insert 44 and the mother mold core 41.

[0065] Specifically, a molding protrusion 412 is formed at the molding groove 411, so that when the tail plug 1 is injection molded, a sound pickup hole 21 can be formed on the plastic body 20. Of course, it can be determined whether to set the sound pickup hole 21 on the plastic body 20 as needed, and then adjust the setting of the molding protrusion 412.

[0066] In some embodiments, a first molding groove 436 and a second molding groove 437 are formed on both sides of the molding protrusion 431 .

[0067] S4 , the plastic body 20 of the tail plug 1 is injection molded on each two electrodes 10 corresponding to the two material strips 30 .

[0068] Specifically, after the mold is closed, the side wall of the molding groove 411 is attached to and a certain pressure is applied to the outer wall 112 of the bending portion 11 to ensure that the shape of the bonding surface between the inner wall 111 of the bending portion 11 and the plastic body 20 is regular.

[0069] In a specific example, an overpressure of 0.01 mm is provided, thereby ensuring that the bonding surface between the inner wall 111 of the bent portion 11 and the plastic body 20 has a regular shape.

[0070] Specifically, the injection molding method used in the present application is a submerged injection method. The gate of the submerged injection is usually designed on the inner side or hidden position of the product, and can be automatically cut off when the mold is opened, thereby avoiding leaving gate marks on the appearance surface of the tail plug 1 and improving the aesthetics of the tail plug 1.

[0071] S5, separating each tail plug 1 from the material strip plate 31 at each pre-breaking point 32.

[0072] In the embodiment of the present application, the manufacturing method of the tail plug 1 of the Bluetooth headset is as follows: a metal sheet is punched into a material strip 30 including a material strip plate 31 and a plurality of electrodes 10, and then the material strip 30 is plated, and finally two material strips 30 are placed at the set position of the injection mold 40, and the plastic body 20 of the tail plug 1 is cast on the electrode 10, and finally the tail plug 1 and the material strip plate 31 are separated from the pre-break point 32 to obtain a plurality of independent tail plugs 1. This method first punches out a plurality of electrodes 10 connected to the same material strip plate 31, and then simultaneously injects the plastic body 20 on each electrode 10, and then does not need to assemble the tail plugs 1 individually, which is conducive to improving production efficiency, suitable for mass production, and also conducive to reducing production costs.

[0073] Please combine Fig.13 The present application also discloses a tail plug 1 of a Bluetooth headset, which is manufactured by the manufacturing method as described above.

[0074] Specifically, the Bluetooth headset is a TWS headset.

[0075] Specifically, the bottom end of the plastic body 20 extends outward to form a first extending portion 22 and a second extending portion 23 that are oppositely disposed. The first extending portion 22 and the second extending portion 23 are located between the two connecting portions 12 .

[0076] More specifically, the first extension portion 22 and the second extension portion 23 are formed in the first forming groove 436 and the second forming groove 437 , respectively.

[0077] Specifically, a sound pickup hole 21 is formed on the plastic body 20 , which can be formed by the aforementioned molding protrusion 412 .

[0078] The above disclosure is only a preferred example of the present application, and its role is to facilitate the technical personnel in this field to understand and implement it. Of course, it cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the scope of the patent application of the present application still fall within the scope covered by the present application.

Claims

1. A method for manufacturing a tail plug of a Bluetooth headset, characterized in that: include: Stamping a metal sheet into a material strip, wherein the material strip comprises a material strip plate and a plurality of electrodes connected to the material strip plate, wherein a pre-breaking point is formed at a connection between each electrode and the material strip plate; Plating the material strip; Placing the two plated strips at set positions of the injection mold respectively; Injection-molding a plastic body of a tail plug on each of the two electrodes corresponding to the two material strips; Each tail plug is separated from the material strip plate from each pre-breaking point.

2. The manufacturing method according to claim 1, characterized in that The electrode includes a connecting portion and a bending portion injection-molded on the plastic body, one end of the connecting portion is connected to the strip plate through the pre-breaking point, the bending portion is formed by bending the other end of the connecting portion to one side, the bending portion includes an inner wall and an outer wall facing and facing away from the side of the connecting portion respectively, and the outer wall is a smooth curved surface; after the plastic body is molded on the electrode, the outer wall is exposed to the outside.

3. The manufacturing method according to claim 2, characterized in that: The two opposite side walls of the bending portion connected between the inner wall and the outer wall are respectively provided with buckles, and the buckles are injection-molded in the plastic body.

4. The manufacturing method according to claim 2, characterized in that: The injection mold comprises a female mold core, a male mold core, a male mold insert, a positioning insert and a lateral slide block; A row of molding grooves is formed on the lower surface of the female mold core; The lower end of the male mold insert is fixed to the male mold core, the upper surface of the male mold insert is in contact with the lower surface of the female mold core, and a row of molding convex parts are convexly provided on the upper surface of the male mold insert, and each molding convex part extends into each molding groove respectively; The lower end of each positioning insert is fixed to the male mold core, two positioning inserts are respectively arranged on both sides of the male mold insert corresponding to each of the molding convex parts, an upwardly penetrating installation gap is formed between the positioning insert and the male mold insert, the strip plate is inserted downward into each of the installation gaps located on the same side of the male mold insert, and each of the electrodes at least partially extends into the corresponding molding groove; The lateral sliders are respectively provided on the opposite sides of the male mold insert, and the lateral sliders are laterally slidably arranged between the female mold core and the male mold core. The lateral sliders are configured to push each of the positioning inserts to press the material strip board between the male mold insert and the positioning inserts after the material strip board is inserted into the installation gap.

5. The manufacturing method according to claim 4, characterized in that: The male mold insert comprises an insert upper portion and an insert lower portion, two side surfaces of the insert lower portion outwardly extend beyond two side surfaces of the insert upper portion, a step surface is formed between the side surfaces of the insert lower portion and the corresponding side surfaces of the insert lower portion, and an end of the strip plate away from the electrode is configured to be supported on the step surface; The step surface is provided with a positioning protrusion protruding upward, and the end of the strip plate away from the electrode is formed with a positioning notch adapted to the positioning protrusion; or The step surface is concavely provided with a positioning notch, and the end of the strip plate away from the electrode is formed with a positioning convex portion adapted to the positioning notch.

6. The manufacturing method according to claim 4, characterized in that: The end face of the bending portion is configured to fit on the upper surface of the positioning insert, the upper surface of the stator insert partially fits on the lower surface of the female mold core, a positioning boss is protruding from the upper surface of the positioning insert, and a side wall of the positioning boss is configured to abut the end of the inner wall of the bending portion.

7. The manufacturing method according to claim 6, characterized in that: The positioning boss is configured to be inserted between the connecting portion and the bending portion.

8. The manufacturing method according to claim 4, characterized in that: After the mold is closed, the side wall of the molding groove is attached to and applies pressure to the outer wall of the bending portion.

9. The manufacturing method according to claim 4, characterized in that: The inner side wall of the lateral sliding block is provided with positioning grooves corresponding to the positioning inserts in the same row. When the inner side wall of the lateral sliding block is attached to the male mold insert, the positioning grooves are clamped on the positioning inserts.

10. A tail plug for a Bluetooth headset, characterized in that: The tail plug of the Bluetooth headset is manufactured by the manufacturing method according to any one of claims 1 to 9.

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