Abstract:
A manufacturing method for an EMI-preventing socket comprises the following steps of providing an EMI-preventing element and a plurality of pins, wherein at least one of the pins is a ground pin; connecting the EMI-preventing element to the ground pin via a direct physical connection; providing a mold; placing the EMI-preventing element, the ground pin and the remaining pins of the plurality of pins in the mold, wherein the EMI-preventing element surrounds the pins in the mold; and providing a molding material into the mold to cover the plurality of pins and to cover a joint of the EMI-preventing element and the ground pin to form a socket body of the EMI-preventing socket. Parts of the EMI-preventing element and one end of each of the plurality of pins is exposed out of the socket body of the EMI-preventing socket.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This Non-provisional application claims priority under 35 U.S.C. §119(a) on Patent Application No(s). 201110196206.2 filed in People&#39;s Republic of China on Jul. 13, 2011, the entire contents of which are hereby incorporated by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of Invention 
     The present invention relates to a manufacturing method of a socket and, in particular, to a manufacturing method of an EMI-preventing socket. 
     2. Related Art 
     Electromagnetic interference (EMI) may decrease the performance of devices, apparatuses or systems, or cause harmful electromagnetic results which damage lives or inorganic materials. EMI are usually derived from electromagnetic noises, useless signals, or the changes of the transmitting medium itself. If high-frequency wave energy and signal modulation are used, the radiation may be easily leaked from the transmitting medium. To solve the EMI problem, it is usually to configure the conductive fabric, conductive coating, absorbing material, spot soldering, or iron workpiece to generate the grounding conduction to block/isolate the noises generated by the internal components. 
       FIG. 1  is a schematic diagram showing a conventional power input socket  1 . At first, a ground pin  111  and other pins  112  and  113  are placed in a mold (not shown). Then, a molding material B is provided by injection molding to wrap the pins  111 ,  112  and  113 , thereby forming the power input socket  1 . In order to prevent the generation of electromagnetic radiation, a conductive element  12  is provided to contact and connect to the ground pin  111  by soldering. Thus, the conductive element  12  can be grounded through the ground pin  111 . However, the soldering process for connecting the conductive element  12  and the ground pin  111  easily affects the stability of the manufacturing processes and needs longer working time, so it is not suitable for mass production and rework. 
     Therefore, it is an important subject to provide a manufacturing method of an EMI-preventing socket that can prevent the undesired EMI, improve the manufacturing yield, and sufficiently reduce the manpower cost and working time. 
     SUMMARY OF THE INVENTION 
     In view of the foregoing, the present invention is to provide a manufacturing method of an EMI-preventing socket that can effectively prevent the EMI, improve the assembling process, and enhance the production performance. 
     To achieve the above, one embodiment of the present invention is to provide a manufacturing method for an EMI-preventing socket. The manufacturing method comprises the following steps of: providing an EMI-preventing element and a plurality of pins that comprises a ground pin; connecting a connecting portion of the EMI-preventing element to the ground pin; providing a mold; placing the EMI-preventing element, the ground pin and the other pins in the mold, while the EMI-preventing element surrounds the pins in the mold; and providing a molding material into the mold to wrap the pins and a joint of the connection portion of the EMI-preventing element and the ground pin to form a socket body of the EMI-preventing socket, wherein parts of the EMI-preventing element and one ends of the pins are exposed out of the socket body of the EMI-preventing socket. 
     In one preferred embodiment of the present invention, after the step of forming the socket body of the EMI-preventing socket, the manufacturing method further comprises a step of solidifying the molding material. 
     In one preferred embodiment of the present invention, the step of connecting the EMI-preventing element to the ground pin is to connect the EMI-preventing element with the ground pin by riveting, clipping, contacting, or other well-know sills. 
     In one preferred embodiment of the present invention, the step of providing the molding material to form the socket body of the EMI-preventing socket is performed by casting molding or injection molding. 
     In one preferred embodiment of the present invention, the pins comprise a ground pin, a firewire pin, and a neutral pin. 
     To achieve the above, one embodiment of the present invention also discloses an EMI-preventing socket comprising an EMI-preventing element, a plurality of pins and a socket body. The EMI-preventing element has at least one connecting portion, the pins at least comprise a ground pin, and the connecting portion of the EMI-preventing element and the ground pin are connected securely. The socket body wraps the pins and a joint of the connection portion of the EMI-preventing element and the ground pin. 
     In one preferred embodiment of the present invention, the pins comprise a ground pin, a firewire pin, and a neutral pin. 
     As mentioned above, the manufacturing method of the present invention is to connect the EMI-preventing element with the ground pin in advance by, for example, riveting, and then form the socket body of the EMI-preventing socket by injection molding. In other words, the EMI-preventing element and the ground pin are connected before injecting the molding material. This procedure can firmly connect the EMI-preventing element with the ground pin. After the following molding step, the manufactured product can effectively prevent the undesired EMI, increase the production yield, and reduce the manufacturing time. Besides, the manufacturing method of the present invention does not use a soldering process to connect the EMI-preventing element with the ground pin, so that it can reduce manpower cost and working time and be more environmentally friendly. 
    
    
     
       BRIEF DESCRIPTION OF THF DRAWINGS 
       The present invention will become more fully understood from the subsequent detailed description and accompanying drawings, which are given by way of illustration only, and thus are not limitative of the present invention, and wherein: 
         FIG. 1  is a schematic diagram showing a conventional power input socket; 
         FIG. 2  is a flow chart of a manufacturing method of an EMI-preventing socket according to a preferred embodiment of the present invention; and 
         FIGS. 3 and 4  are schematic diagrams showing the EMI-preventing socket during the manufacturing processes according to a preferred embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The present invention will be apparent from the following detailed description, which proceeds with reference to the accompanying drawings, wherein the same references relate to the same elements. 
       FIG. 2  is a flow chart of a manufacturing method of an EMI-preventing socket according to a preferred embodiment of the present invention, and  FIG. 3  is a schematic diagram showing the EMI-preventing socket during the manufacturing processes. Referring to  FIGS. 2 and 3 , the EMI-preventing socket of the present embodiment is, for example, a three-hole socket that is suitable for home appliances and factory machines. Of course, the manufacturing method of the invention can also be applied to fabricate other sockets with EMI-preventing function. 
     At first, a step S 1  is to provide an EMI-preventing element  21  and a plurality of pins  221 ,  222  and  223 . Herein, the pin  221  is a ground pin. The EMI-preventing element  21  is made of electrically conductive material, for example, metal. Alternatively, if the EMI-preventing element is made of non-conductive material, it is preferably to dispose a conductively metallic layer on the EMI-preventing element. As shown in  FIG. 3 , the EMI-preventing element  21  comprises a frame  211 , two connecting portions  212  and two clipping portions  213 . The clipping portions  213  are disposed at two opposite sides of the frame  211  and protruded from the frame  211 . The connecting portions  212  are disposed at the center of the frame  211 , and each of them includes a connecting hole  212   a . The connecting holes  212   a  are positioned opposite to each other. To be noted, the shape and appearance of the EMI-preventing element  21  disclosed hereinabove is not to limit the scope of the present invention, but depends on the design purpose according to the desired functions and operations. 
     In this embodiment, the pin  221  is a ground pin, the pin  222  is a firewire pin, and the pin  223  is a neutral pin. The ground pin  221  is disposed between the connecting portions  212  of the EMI-preventing element  21 . Each of the pins  221 - 223  has at least one through hole  224 . In this embodiment, each of the pins  221 - 223  has several through holes  224 . The functions of the through holes  224  will be described hereinafter. 
     Next, a step S 2  is to connect the connecting portions  212  of the EMI-preventing element  21  to the ground pin  221 . The EMI-preventing element  21  and the ground pin  221  are connected by riveting, clipping, or directly contacting without any other objects or elements. Since the connecting portions  212  and the ground pin  221  are connected, the EMI-preventing element  21  and the ground pin  221  are connected accordingly. In this embodiment, the connecting portion  212  of the EMI-preventing element  21  and the ground pin  221  are connected by riveting. In more detail, a rivet (not shown) is provided passing through the ground pin  221  and the connecting holes  212   a  of the connecting portions  212  of the EMI-preventing element  21  and the protrusion part of the rivet is punched to form a rivet head, thereby finishing this connecting process. 
     A step S 3  is to provide a mold (not shown). In this embodiment, the mold is configured to accommodate the EMI-preventing element  21  and the pins  221 - 223 . Thus, the space inside the mold should be larger than the total volume of the EMI-preventing element  21  and the pins  221 - 223 . The mold can be made of any useable material well-known in the field, which is not described here. 
     Then, a step S 4  is to place the EMI-preventing element  21  as well as the connected ground pin  221  and the other pins  222  and  223  in the mold, while the frame  211  of the EMI-preventing element  21  surrounds the pins  221 - 223  in the mold. To be noted, when the pins  221 - 223  and the EMI-preventing element  21  are placed in the mold, only the ground pin  221  is connected to the EMI-preventing element  21 , and the other two pins  222  and  223  are individually positioned and separated from EMI-preventing element  21  and the ground pin  221 . 
       FIG. 4  is a schematic diagram showing the finished EMI-preventing socket  2  according to the preferred embodiment of the present invention. Referring to  FIGS. 2 and 4 , a step S 5  is to provide a molding material into the mold to wrap the pins  221 - 223  and a joint of the connection portions  212  of the EMI-preventing element  21  and the ground pin  221  to form a socket body A of the EMI-preventing socket  2 . In this embodiment, parts of the EMI-preventing element  21  and one ends of the pins  221 - 223  are exposed out of the socket body A of the EMI-preventing socket  2 . Accordingly, the frame  211  and the clipping portions  213  of the EMI-preventing element  21  are appeared on the socket body A. Besides, the EMI-preventing socket can be formed in the step S 5  by casting molding or injection molding. In practice, the solid molding material is heated to melting state, and then flows into the mold to fill the through holes  224  of the pins  221 - 223  and the clipping portions  213  of the EMI-preventing element  21 . This step S 5  can enhance the connection strength between the molding material, the EMI-preventing element  21 , and the pins  221 - 223 . 
     Finally, a step S 6  is to solidify the molding material. In this embodiment, the molding material can be solidified by cooling, thereby forming the solid socket body A. In other words, the socket body A is the solidified molding material. Since the molding material is filled between the pins  221 - 223 , the positions of the pins  221 - 223  can also be fixed after solidifying the molding material, so that the socket body A can cover the pins  221 - 223 . Besides, since the molding material is also filled in the clipping portions  213  of the EMI-preventing element  21  and the connection portions  212  of the EMI-preventing element  21  and the ground pin  221 , the positions of the EMI-preventing element  21  and the joint of the connection portions  212  of the EMI-preventing element  21  and the ground pin  221  can be securely fixed after solidifying the molding material. 
     Referring to  FIG. 4  again, the present invention also discloses an EMI-preventing socket  2  including an EMI-preventing element  21 , a plurality of pins  221 - 223  and a socket body A. Please see  FIG. 4  in view of  FIG. 3  for the following illustration. The EMI-preventing element  21  comprises a frame  211 , at least a connecting portion  212  and two clamping portions  213 . The clamping portions  213  are disposed at two sides of the frame  211  and protruded from the frame  211 . The connecting portion  212  is disposed at the center of the frame  211  and includes a connecting hole  212   a . In this embodiment, the EMI-preventing element  21  comprises two connecting portions  212 , and each connecting portion  212  has a connecting hole  212   a . The connecting holes  212   a  can be disposed either opposite to each other or not. To be noted, the EMI-preventing element  21  of this embodiment is not to limit the scope of the present invention, and it can be modified according to desired function or operation. 
     The pins  221 - 223  can be divided into a ground pin  221 , a firewire pin  222  and a neutral pin  223 . The ground pin  221  is disposed between the connecting portions  212  of the EMI-preventing element  21 . Herein, the connecting portions  212  connect the ground pin  221 , so that the EMI-preventing element  21  and the connecting portions  212  are connected. Each of the pins  221 - 223  has at least one through hole  224 . In this embodiment, each of the pins  221 - 223  has several through holes  224 . 
     The socket body A wraps the pins  221 - 223  and a joint of the EMI-preventing element  21  and the ground pin  221  as well as the connection portions  212  of the EMI-preventing element  21 . In addition, the socket body A may pass through the through holes  224  of the pins  221 - 223 , and be disposed between the clamping portions  223  for fixing the positions of the EMI-preventing element  21  and the pins  221 - 223 . This configuration can further increase the strength of the connections. In this case, the frame  211  and clamping portions  213  of the EMI-preventing element  21  and one ends of the pins  221 - 223  are exposed from the socket body A. 
     In summary, the manufacturing method of the present invention is to connect the connecting portion of the EMI-preventing element with the ground pin in advance by, for example, riveting, and then form the EMI-preventing socket by injection molding. In other words, the EMI-preventing element and the ground pin are connected before injecting the molding material. This procedure can firmly connect the EMI-preventing element with the ground pin. After the following molding step, the manufactured product can effectively prevent the undesired EMI, increase the production yield, and reduce the manufacturing time. Besides, the manufacturing method of the present invention does not use a soldering process to connect the EMI-preventing element with the ground pin, so that it can reduce manpower cost and working time and be more environmentally friendly. 
     Although the present invention has been described with reference to specific embodiments, this description is not meant to be construed in a limiting sense. Various modifications of the disclosed embodiments, as well as alternative embodiments, will be apparent to persons skilled in the art. It is, therefore, contemplated that the appended claims will cover all modifications that fall within the true scope of the present invention.