1. Field of the Invention
The present disclosure relates to an electrical connector, and more particularly to an electrical connector having a metallic shell of multilayer surface treatment and a method for making such metallic shell.
2. Description of Related Art
Conventional electronic devices, such as mobile phones, usually have black appearance. In order to match with such color, electrical connectors outwardly exposed on such black electronic devices should have black surface treatment.
Nowadays, in industry, back surface treatment technologies usually include black electrophoretic coating treatment, directly plating black nickel treatment and directly plating black titanium treatment. Take the black electrophoretic coating treatment for example, in such treatment, an insulative layer is formed on peripheral sides of a metallic shell of an electrical connector. However, such insulative layer can not meet electrical conduction requirement and mostly importantly, its anti-wear capability is poor. In a word, the metallic shell treated under conventional back surface treatment technologies exists poor soldering capability and poor anti-wear capability and is not suitable for being applied in current electronic devices.
Hence, it is desirable to provide an electrical connector with improved surface treatment and a method for making the same.
The present disclosure provides an electrical connector including an insulative housing, a plurality of contacts retained in the insulative housing and a metallic shell enclosing the insulative housing. The metallic shell includes a plurality of peripheral walls jointly forming a receiving cavity and a soldering tab extending from one of the peripheral walls to be soldered to a circuit board. Each of the soldering tab and the peripheral walls includes an intermediate layer made of a first material, a first plating layer made of a second material, a second plating layer made of a third material and a third plating layer made of a fourth material. The third material is of robust soldering capability and the fourth material is of robust anti-wear capability. The first plating layer covers both inner and outer sides of the intermediate layer of the soldering tab and the peripheral walls. The second plating layer covers both inner and outer sides of the first layer of the soldering tab and the peripheral walls. The third plating layer covers both inner and outer sides of the second layer of the peripheral walls for enhancing anti-wear properties while leaving the second layer of the soldering tab uncoated for wetting.
Besides, the present disclosure provides a method for surface treatment of a metallic shell of an electrical connector. The method includes the steps of:
The foregoing has outlined rather broadly the features and technical advantages of the present disclosure in order that the detailed description of the invention that follows may be better understood. Additional features and advantages of the invention will be described hereinafter which form the subject of the claims of the invention.
For a more complete understanding of the present disclosure, and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:
Reference will now be made to the drawing figures to describe the preferred embodiment of the present disclosure in detail. As shown in
Referring to
Referring to
The first plating layer 21 coated on the intermediate layer 20 is for providing a suitable substrate for easily coating the subsequent second plating layer 22. The second plating layer 22, on one hand, improves the soldering capability of the soldering tabs 15, and on the other hand, improves the integral conductive capability of the metallic shell 1. The third plating layer 23, on one hand, presents the metallic shell 1 of black color so as to keep it in accord with the color of the electronic device, and on the other hand, improves the anti-wear capability of the metallic shell 1. The “back color” includes matted black.
It is noted that the third plating layer 23 is uncoated on the second plating layer 22 of the soldering tabs 15 in order to prevent that the third plating layer 23 weakening the soldering capability of the soldering tabs 15.
When the electronic devices are of back colors, through the structure of the metallic shell 1 of the present invention, the metallic shell 1 not only has robust conductive capability, robust soldering capability and robust anti-wear capability, but also the color of the metallic shell 1 can be in accord with the color of the electronic devices.
Referring to
In the step S2), the second material of the first plating layer 21 is nickel alloy. In the step S3), the third material of the second plating layer 22 is gold or tin. In the step S5), the fourth material of the third plating layer 23 is black titanium or black nickel, and the third plating layer 23 is fabricated by Physical Vapor Deposition (PVD) vacuum plating technology. Because the process temperature of the PVD vacuum plating technology is high (near 400° C.), it requires the third material of the second plating layer 22 has high temperature resistance. According to the preferred embodiment of the present invention, under this processing method, gold is selected as the third material of the second plating layer 22. However, in other embodiments, the third plating layer 23 can be fabricated by chemical plating technology. Because the process temperature of the chemical plating technology is usually low, under this condition, either gold or tin can be selected as the suitable material of the second plating layer 22.
In the step S4), the soldering tab 15 is coated by a protective sleeve or is adhibited by a protective membrane. Correspondingly, the step S6) includes removing the protective sleeve or the protective membrane. However, in alternative embodiments, in the step S4), the soldering tab 15 can be protected by a kind of lipid. Correspondingly, the step S6) includes removing the kind of lipid.
It is to be understood, however, that even though numerous, characteristics and advantages of the present disclosure have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosed is illustrative only, and changes may be made in detail, especially in matters of number, shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broadest general meaning of the terms in which the appended claims are expressed.
Number | Date | Country | Kind |
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2011 1 0437610 | Dec 2011 | CN | national |
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