CN106985337A - USB tongue pieces processing method, USB tongue pieces and mobile terminal - Google Patents

Abstract

The invention provides a method for processing a USB tongue, a USB tongue and a mobile terminal. The processing method includes: roughening a preset number of pre-pressed metal terminals, wherein the metal terminals include a The first part of the sheet part and the second part for forming the welding part; placing a preset number of metal terminals side by side at a preset distance on a support base material covered with an adhesive material; for metal terminals stacked in sequence 1. Pressing the adhesive material and the supporting base material at the position of the first part to form a tongue pretreatment structure; performing injection molding on the tongue pretreatment structure to obtain a USB tongue. Therefore, the solution of the present invention solves the problem of insufficient bonding force between the metal terminal and the plastic part caused by electroplating the metal terminal first and then injection molding in the conventional processing technology of the USB tongue.

Description

USB tongue processing method, USB tongue and mobile terminal

technical field

The invention relates to the field of electronic technology, in particular to a method for processing a USB tongue, a USB tongue and a mobile terminal.

Background technique

USB is a technical specification for input and output interfaces, and is widely used in communication products such as mobile phones, tablet computers, digital TVs, game consoles, and personal computers. At present, the production process of USB consists of one-time injection molding or two-time injection molding of metal terminals, and then the iron shell assembly is completed, but there are the following defects:

Most of the terminals are electroplated with gold on the metal substrate, and then the terminals and plastic are injection molded. Due to the small surface roughness of the terminal after gold plating, the bonding force between the terminal and the plastic part after injection molding is insufficient, so the tongue terminal is easy to be loosened by force and cracks during the USB plugging and unplugging process, and then in the case of liquid entering the USB position. Water is stored in the crevices and corrodes under electrified conditions.

Among them, USB is currently the most popular way of data exchange and charging of mobile phones. However, with the increase of charging current and voltage, and the complication of mobile phone usage environment, the above-mentioned defects in the USB processed by the existing USB production process will lead to the failure of data exchange and charging functions.

Contents of the invention

Embodiments of the present invention provide a method for processing a USB tongue, a USB tongue, and a mobile terminal, so as to solve the problem of insufficient bonding force between the metal terminal and the plastic parts caused by the metal terminal being electroplated before injection molding in the conventional processing technology of the USB tongue. question.

Embodiments of the present invention provide a USB tongue processing method, comprising:

roughening a predetermined number of pre-pressed metal terminals, wherein the metal terminals include a first portion for forming a tongue portion and a second portion for forming a solder portion;

placing a predetermined number of the metal terminals side by side at a predetermined distance on a support substrate covered with an adhesive material;

Pressing the sequentially stacked metal terminals, the adhesive material, and the supporting substrate at the position of the first part to form a tongue pretreatment structure;

Injection molding the pretreatment structure of the tongue, so that the adhesive material and the supporting base material are both fixed in the molding plastic, and the other part of the first part opposite to the surface that is attached to the adhesive material One surface is exposed on the surface of the molding plastic, and the second part protrudes from the inside of the molding plastic to obtain a USB tongue.

Embodiments of the present invention also provide a USB tongue made by the method described above, including:

molded plastic;

a supporting substrate, the supporting substrate is fixed in the molding plastic;

an adhesive material fixed within the molded plastic;

A preset number of metal terminals placed side by side at a preset distance, the metal terminals include a tongue portion and a welding portion, the tongue portion is fixed on the supporting base material through the adhesive material, and the welding portion Protruding outward from the molding plastic, wherein, the other surface of the tongue part, which is opposite to the surface attached to the adhesive material, is exposed on the surface of the molding plastic, and the tongue part The surface attached to the adhesive material has a preset roughness.

An embodiment of the present invention also provides a mobile terminal, including a USB socket, and the USB socket has the above-mentioned USB tongue.

The beneficial effects of the embodiments of the present invention are:

In the embodiment of the present invention, roughening treatment is first performed on a preset number of pre-pressed metal terminals, and then the metal terminals, adhesive materials and supporting substrates stacked in sequence are subjected to pressing treatment to form a tongue pretreatment structure , and then perform injection molding on the pretreatment structure of the tongue, so that the adhesive material and the supporting base material are fixed in the molding plastic, and the metal terminal is used to make the surface of the first part of the tongue part that is attached to the adhesive material The opposite surface is exposed on the surface of the molding plastic, and the second part of the metal terminal used to form the welding part protrudes from the inside of the molding plastic, so as to meet the structure and conduction conditions of the USB tongue. Among them, since the surface of the metal terminal is roughened, the surface roughness of the metal terminal is increased, so after the bonding material is partially pressed with the supporting substrate, the bonding force between the metal terminal and its bottom insulating material is increased, It ensures the reliability of the combination of the metal terminal and the bottom insulating material, thereby improving the corrosion resistance of the USB terminal and reducing the probability of failure of the charging and data transmission functions caused by the corrosion of the USB terminal.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments of the present invention. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention , for those skilled in the art, other drawings can also be obtained according to these drawings without paying creative labor.

Fig. 1 represents the flow chart of the USB tongue processing method of the first embodiment of the present invention;

2 shows a schematic cross-sectional view of a metal terminal after roughening treatment in the first embodiment of the present invention;

Fig. 3 shows the partially enlarged schematic diagram of B in Fig. 2;

4 shows a schematic cross-sectional view of a metal terminal, an adhesive material, and a supporting substrate in a press-bonding process in the first embodiment of the present invention;

Fig. 5 shows the structural representation of the USB tongue of the second embodiment of the present invention;

Fig. 6 represents the schematic cross-sectional view of A-A in Fig. 5;

FIG. 7 shows a partially enlarged schematic diagram of C in FIG. 6 .

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

first embodiment

The embodiment of the present invention provides a kind of USB tongue processing method, as shown in Figure 1, this processing method comprises:

Step 101: Perform roughening treatment on a preset number of pre-pressed metal terminals.

Wherein, the metal terminal includes a first part for forming the tongue part and a second part for forming the welding part. The tongue portion is used for contact connection with the conductive terminal on the USB plug, and the welding portion is used for welding connection with the relevant conductive wires on the mobile terminal. In addition, the pre-pressed metal terminals are strip-like structures. Further, the metal terminal is made of copper alloy.

In addition, roughening treatment is to treat the surface of the workpiece by mechanical or chemical methods (mechanical wear or chemical corrosion), so as to obtain a microscopic rough structure on the surface of the workpiece, making it change from hydrophobic to hydrophilic. Therefore, the roughening treatment in the embodiment of the present invention is to form a uniform microscopic roughening effect on the surface of the metal terminal, that is, to make the surface roughness of the metal terminal greater than a preset threshold, thereby increasing the roughness of the surface of the metal terminal.

Preferably, step 101 includes: roughening the surface of a preset number of pre-press-formed metal terminals by using a browning treatment process, a blackening treatment process or an ultra-roughening treatment process.

Among them, after the metal terminal is roughened by the browning treatment process, a layer of browning film will be formed on the surface of the metal terminal; after the metal terminal is roughened by the blackening treatment process, a brown film will be formed on the surface of the metal terminal A layer of oxide. In addition, the super-roughening treatment process is a copper surface treatment process designed for roughening the copper surface. Therefore, when the metal terminal is roughened by the super-roughening treatment process, the metal terminal needs to be made of copper material, such as copper alloy. Specifically, as shown in FIG. 2 and FIG. 3 , it is a schematic cross-sectional view of a metal terminal after roughening treatment, and the roughened layer 2 covering the surface of the metal terminal 1 is a browning film or an oxide layer.

Step 102: placing a preset number of the metal terminals side by side at a preset distance on a support substrate covered with an adhesive material.

Wherein, the preset number of metal terminals is placed at a preset distance (as shown in FIG. 5 ), so that the metal terminals do not touch each other, that is, there is no electrical connection between the metal terminals, thereby satisfying the requirements of the USB tongue. conduction requirements. In addition, a predetermined number of metal terminals are arranged side by side, which can meet the structural requirements of the USB tongue.

In addition, the adhesive material is used to adhesively connect the first part of the metal terminal to the supporting substrate. Preferably, the adhesive material is a pure rubber material or a prepreg whose fluidity is lower than a preset threshold. Among them, the prepreg has the characteristics of softening under heat and pressure, and reacting and solidifying after cooling. Therefore, the prepreg can also be used as an adhesive material to fix the metal terminal and the supporting substrate.

Preferably, the supporting substrate is a copper clad laminate substrate. Wherein, it can be understood that the specific constituent material of the support substrate is not limited thereto.

Step 103: Pressing the sequentially stacked metal terminals, the adhesive material and the supporting base material at the position of the first part to form a tongue pretreatment structure.

Wherein, for the successively stacked metal terminals, after the adhesive material and the supporting base material are pressed together at the position of the first part, the first part of the metal terminal used to form the tongue part passes through the adhesive material and the supporting base material. fixed together.

Preferably, step 103 includes: placing a pressure-bonding cushioning material on the surface of the first part that is opposite to the surface that is bonded to the adhesive material; The buffer material, the metal terminal, the adhesive material and the supporting base material are pressed together to form a tongue pretreatment structure.

That is, as shown in FIG. 4 , in the embodiment of the present invention, when the metal terminal 1, the adhesive material 3 and the supporting base material 4 that are stacked in sequence are pressed together, the first part of the metal terminal 1 can be bonded with the adhesive. A pressing buffer material 5 is placed on the other surface opposite to the surface to which the bonding material 3 is bonded, so as to avoid damage to the surface of the metal terminal during the subsequent pressing process using the pressing jig 6 .

Wherein, when utilizing the pressing jig 6 to carry out the pressing process, as shown in FIG. The terminal 1, the press-fit buffer material 5, and then use the press-fit jig 6 to apply pressure on the press-fit cushion material 5 for press-fit processing, or fix the press-fit buffer material 5 on the press-fit surface of the press-fit jig 6 , so that the buffer material 5 can effectively protect the metal terminal 1 from damage when the pressing tool 6 is used to apply a pressing force to the metal terminal 1 .

Step 104: Perform injection molding on the pretreatment structure of the tongue, so that the adhesive material and the supporting base material are fixed in the molding plastic, and the surface of the first part that is attached to the adhesive material The opposite surface is exposed on the surface of the molding plastic, and the second part protrudes from the inside of the molding plastic to form a USB tongue.

Among them, after the injection molding process, the first part of the metal terminal used to make the tongue part has a surface exposed on the surface of the molding plastic, so as to facilitate contact and connection with the conductive terminal on the USB plug, and is used to make the second part of the welding part. Parts protrude from the molded plastic to facilitate soldering connections with associated conductive connections on the mobile terminal. It can be seen from the above that the USB tongue processed by the embodiment of the present invention can meet the basic requirements of structural form and contact conduction.

In addition, after the injection molding process, both the supporting base material and the adhesive material are fixed in the molded plastic, which can make the USB tongue obtained by the embodiment of the present invention meet the overall basic bonding force requirements; otherwise, if the supporting base material and the adhesive material If the connection material is separated from the molded plastic, the metal terminal will be separated from the easy-to-support substrate during the subsequent use of the USB tongue.

Preferably, after step 103, the embodiment of the present invention further includes: performing electroplating on the surface of the metal terminal other than the bonding surface with the adhesive material.

Wherein, after the metal terminal is electroplated, a protective layer can be formed on the surface of the metal terminal, so as to achieve the effect of anti-oxidation and anti-corrosion. In addition, electroplating is performed only on the surface of the bare metal terminal after pressing, which reduces the electroplating area, reduces the consumption of materials used for electroplating, and thus reduces the cost of electroplating. Further, the electroplating may specifically be nickel-gold electroplating.

In addition, the metal terminal pre-pressed during mass production includes a plurality of terminal units, and each terminal unit includes a first portion for forming the tongue portion and a second portion for forming the solder portion. Therefore, in the mass production process, after step 104 , cutting is also required based on the terminal unit, so as to obtain multiple USB tongues. Specifically, laser cutting can be used for cutting.

To sum up, in the embodiment of the present invention, first, roughening treatment is performed on a predetermined number of pre-pressed metal terminals, and then the metal terminals, adhesive materials and supporting substrates stacked in sequence are subjected to pressing treatment to form Tongue pretreatment structure, and then injection molding of the tongue pretreatment structure, so that the bonding material and the supporting base material are fixed in the molding plastic, the metal terminal is used to make the first part of the tongue part, and the bonding material The other surface opposite to the attached surface is exposed on the surface of the molding plastic, and the second part used to form the welding part on the metal terminal protrudes from the inside of the molding plastic, so as to meet the structural form and connection requirements of the USB tongue. pass-through condition. Among them, since the surface of the metal terminal is roughened, the surface roughness of the metal terminal is increased, so after the bonding material is partially pressed with the supporting substrate, the bonding force between the metal terminal and its bottom insulating material is increased, It ensures the reliability of the combination of the metal terminal and the bottom insulating material, thereby improving the corrosion resistance of the USB terminal and reducing the probability of failure of the charging and data transmission functions caused by the corrosion of the USB terminal.

second embodiment

An embodiment of the present invention provides a USB tongue made by the method described above, as shown in FIG. 5 , which is a schematic diagram of the overall structure of the USB tongue according to the embodiment of the present invention, specifically, as shown in FIG. 6 , is a schematic cross-sectional view of A-A in FIG. 5 .

Wherein, as shown in FIG. 6, the USB tongue of the embodiment of the present invention includes:

molding plastic 8;

a supporting substrate 4, the supporting substrate 4 is fixed in the molding plastic 8;

an adhesive material 3, the adhesive material 3 is fixed in the molding plastic 8;

A preset number of metal terminals 1 placed side by side at a preset distance, the metal terminals 1 include a tongue part 11 and a welding part 12, the tongue part 11 is fixed on the supporting base material by the adhesive material 3 4, the welding portion 12 protrudes outward from the molded plastic 8, wherein, the other surface of the tongue portion 11, which is opposite to the surface adhering to the adhesive material 3, is exposed on the The surface of the molded plastic 8, the surface of the tongue part 11 and the adhesive material 3 has a preset roughness. Further, the metal terminal 1 is made of copper alloy.

Wherein, both the supporting base material and the adhesive material are fixed in the molding plastic, so that the USB tongue of the embodiment of the present invention can meet the overall basic bonding force requirements; otherwise, if the supporting base material and the adhesive material are separated from the molding plastic , during the subsequent use of the USB tongue, there will be a problem that the metal terminal is separated from the easy-to-support substrate.

A preset number of metal terminals 1 are placed at a preset distance so that each metal terminal 1 does not contact each other, that is, there is no electrical connection between each metal terminal 1 , thereby meeting the conduction requirement of the USB tongue. In addition, a preset number of metal terminals 1 are arranged side by side, which can meet the structural requirements of the USB tongue.

In addition, the welding part 12 protrudes outward from the molding plastic 8, so as to facilitate the welding connection between the welding part 12 and the relevant conductive connection on the mobile terminal. The other surface of the tongue part 11 opposite to the surface attached to the adhesive material 3 is exposed on the surface of the molded plastic 8, so as to facilitate contact and connection with the conductive terminals on the USB plug.

In addition, the tongue portion 11 , the adhesive material 3 and the supporting base material 4 are fixed together through a pressing process. Wherein, since the surface of the tongue part 11 and the adhesive material 3 has a preset roughness, the surface of the tongue part 11 of the USB tongue of the embodiment of the present invention and the adhesive material 3 are consistent with the adhesive surface. There is a stronger bonding force between the bonding materials 3.

Preferably, the supporting substrate 4 is a copper clad laminate substrate. Wherein, it can be understood that, the specific constituent material of the support substrate 4 is not limited thereto.

Preferably, the adhesive material 3 is a pure rubber material or a prepreg whose fluidity is lower than a preset threshold. Among them, the prepreg has the characteristics of softening under heat and pressure, and reacting and solidifying after cooling. Therefore, the prepreg can also be used as an adhesive material to fix the metal terminal and the supporting substrate.

Wherein, the surface of the tongue portion 11 with a predetermined roughness is obtained after roughening treatment. In addition, roughening treatment is to treat the surface of the workpiece by mechanical or chemical methods (mechanical wear or chemical corrosion), so as to obtain a microscopic rough structure on the surface of the workpiece, making it change from hydrophobic to hydrophilic. Therefore, the surface of the tongue portion having a preset roughness has increased surface roughness compared to that before the roughening treatment.

Preferably, the roughening treatment process may be browning treatment, blackening treatment or super-roughening treatment. Among them, after the browning treatment process is used to roughen the metal terminal, a layer of browning film will be formed on the surface of the metal terminal. Therefore, if the browning treatment is used to increase the surface of the tongue part and the bonding material If the roughness of the metal terminal is roughened, a layer of browning film will be covered on the surface; after the metal terminal is roughened by the blackening treatment process, an oxide layer will be formed on the surface of the metal terminal. Therefore, if the blackening treatment is used Increasing the roughness of the surface where the tongue portion is attached to the adhesive material will cover the surface with an oxide film. Specifically, as shown in FIG. 7 , the roughened layer 2 covering the surface of the metal terminal 1 is a browning film or an oxide layer.

In addition, the super-roughening treatment process is a copper surface treatment process designed to roughen the copper surface. Therefore, when the metal terminal is roughened by the super-roughening treatment process, the metal terminal needs to be made of copper material, such as copper alloy .

Preferably, the surface of the metal terminal 1 other than the bonding surface with the adhesive material 3 is covered with an electroplating layer 9 . Further, the electroplating layer 9 is a nickel-gold layer. Wherein, the electroplating layer 9 can prevent oxidation and corrosion of the metal terminals. In addition, the electroplating layer 9 only covers the surface other than the bonding surface of the metal terminal 1 and the adhesive material 3 , which reduces the coverage area of the electroplating layer 9 and reduces the consumption of materials used for electroplating, thereby reducing the cost of electroplating. Further, the electroplating may specifically be nickel-gold electroplating.

To sum up, in the USB tongue of the embodiment of the present invention, a predetermined number of metal terminals are placed side by side at a predetermined distance, and the welding parts of the metal terminals protrude from the molding plastic, so that the metal terminals and the bonding The surface to which the material fits is exposed outside the molded plastic, so as to meet the structural form and contact conduction requirements of the USB tongue. In addition, since the surface of the tongue part of the metal terminal and the bonding material has a predetermined roughness, and the bonding material and the supporting substrate for supporting the metal terminal are fixed in the molding plastic, the metal terminal and the supporting material Better fixation between substrates. Therefore, the embodiments of the present invention can improve the bonding strength between the metal terminal and the bottom substrate without affecting the structural form and contact conduction, thereby improving the corrosion resistance of the USB terminal and reducing the charging, charging, and charging caused by the corrosion of the USB terminal. The probability of failure of the data transfer function.

third embodiment

An embodiment of the present invention provides a mobile terminal, including a USB socket, and the USB socket has the above-mentioned USB tongue.

Wherein, due to the above-mentioned USB tongue, a predetermined number of metal terminals are placed side by side at a predetermined distance, and the welding part of the metal terminals is protruded from the molding plastic, so that the metal terminals are in close contact with the adhesive material The combined surface is exposed outside the molded plastic, so as to meet the structural form and contact conduction requirements of the USB socket. In addition, since the surface of the tongue part of the metal terminal and the bonding material has a predetermined roughness, and the bonding material and the supporting substrate for supporting the metal terminal are fixed in the molding plastic, the metal terminal and the supporting material Better fixation between substrates. Therefore, the USB socket included in the mobile terminal of the embodiment of the present invention improves the bonding strength between the metal terminal and the bottom substrate without affecting the structural form and contact conduction, improves the corrosion resistance of the USB terminal, thereby reducing The failure probability of charging and data transmission functions of the mobile terminal.

What has been described above is a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications can be made without departing from the principles described in the present invention. These improvements and modifications are also described in this document. within the scope of protection of the invention.

Claims (9)

1. a kind of USB tongue pieces processing method, it is characterised in that including：

Roughening treatment is carried out to the metal terminal of the pre-molding of predetermined number, wherein, the metal terminal includes being used to be made The Part I of tongue piece portion and the Part II for weld part to be made；

The metal terminal interval pre-determined distance of predetermined number is placed side by side in a supporting base material covered with adhesives On；

To the metal terminal, the adhesives and the supporting base material that stack successively at the position of the Part I Pressed, form tongue piece pre-processing structure；

The tongue piece pre-processing structure is molded so that the adhesives and the supporting base material are each attached into shape In glue, the surface fitted on the Part I, with the adhesives relative to another surface exposure described into shape The surface of glue, the Part II, to overhanging, obtains USB tongue pieces out of described forming plastic cement.

2. according to the method described in claim 1, it is characterised in that the metal terminal of the pre-molding to predetermined number enters The step of row roughening treatment, including：

Using the metal of brown handling process or blackening treatment process or super roughening treatment technique to the pre-molding of predetermined number The surface of terminal carries out roughening treatment.

3. according to the method described in claim 1, it is characterised in that the metal terminal, described viscous to stacking successively Connect material and the supporting base material is pressed at the position of the Part I, the step of forming tongue piece pre-processing structure, Including：

Pressing fender is placed on another surface on the Part I, relative with the surface that the adhesives fits Material；

Using tool for stitching to the pressing padded coaming stacked successively, the metal terminal, the adhesives and described Supporting base material is pressed, and forms tongue piece pre-processing structure.

4. according to the method described in claim 1, it is characterised in that the adhesives is pure glue material or fluidity less than pre- If the prepreg of threshold value.

5. according to the method described in claim 1, it is characterised in that the metal terminal, described viscous to stacking successively Connect material and the supporting base material pressed at the position of the Part I, formed tongue piece pre-processing structure the step of it Afterwards, in addition to：

To being electroplated on the metal terminal with the surface outside the binding face of the adhesives.

6. the USB tongue pieces that a kind of any one of use claim 1 to 5 methods described is made, it is characterised in that including：

Forming plastic cement；

Supporting base material, the supporting base material is fixed in the forming plastic cement；

Adhesives, the adhesives is fixed in the forming plastic cement；

The metal terminal of pre-determined distance predetermined number placed side by side is spaced, the metal terminal includes tongue piece portion and weld part, The tongue piece portion is fixed in the supporting base material by the adhesives, and the weld part is outside from the forming plastic cement Stretch out, wherein, another surface exposure in the tongue piece portion, relative with the surface that the adhesives fits is in the shaping The surface of plastic cement, the tongue piece portion has default roughness with the surface that the adhesives fits.

7. USB tongue pieces according to claim 6, it is characterised in that the adhesives is that pure glue material or fluidity are low In the prepreg of predetermined threshold value.

8. USB tongue pieces according to claim 6, it is characterised in that with the patch of the adhesives on the metal terminal Covered with electrodeposited coating on surface outside conjunction face.

9. a kind of mobile terminal, it is characterised in that including USB socket, the USB socket has as claim 6~8 is any one USB tongue pieces described in.