Patent Publication Number: US-2005118874-A1

Title: Filter structure and method of fabrication

Description:
BACKGROUND OF THE INVENTION  
      (a) Technical Field of the Invention The present invention relates to a filter, and in particular, to a filter structure having conductive wire, and a method of fabricating the filter.  
      (b) Description of the Prior Art  
       FIG. 6  shows a conventional filter comprising an insertion seat  4  having a box body  40  at one side thereof containing resistance  41 , electric induction coil  42  and Y capacitance  43  electronic modules. A cover  400  covers the box body  40  and one side of the box body  40  is provided with a positive terminal plate  44 , a negative terminal plate  45  and a ground plate  46  for connecting with the electronic modules to form into an electronic loop. One side of the insertion seat  4  and the exterior of section of the box body  40  is mounted with a metallic housing  5  such that the positive terminal plate  44 , the negative terminal plate  45  and the ground plate  46  are exposed externally on the metallic housing  5 .  
      The conventional filter employs the exposed positive terminal plate  44 , the negative terminal plate  45  and the ground plate  46  soldered onto the circuit board. Therefore, more space of the circuit board is occupied, and this will affect the mounting of electronic parts. If the two terminals of the conductive wire are respectively connected to the circuit board, and the positive terminal plate  44 , the negative terminal plate  45  and the ground plate  46  to improve the drawback of the occupying space, then the conductive wire will produce electromagnetic wave with the external electronic parts, which interferes with each other. In other words, the filter is not stable.  
      Accordingly, it is an object of the present invention to provide a filter which mitigates the above drawbacks.  
     SUMMARY OF THE INVENTION  
      Accordingly, it is an object of the present invention to provide a filter comprising an insertion seat including a box body at one side thereof and a plurality of electronic modules within the box body and the external side of the box body mounted to a ground terminal, and the electronic modules and the ground terminal formed an electronic loop of the filter, and the positive and negative terminal of the electronic loop being soldered to a positive conductive wire and a negative conductive wire; and a metallic housing having an opened cavity at one side for the mounting of the insertion seat and the bottom portion of the cavity being a terminal hole and a conductive wire hole, and the conductive wire hole being extended to form an isolation mount which functions as electromagnetic wave isolation and the external of the isolation mount being mounted with an insulated rubber mount, and one end of the positive conductive wire and the negative wire from the conductive wire hole via the isolation mount to the exterior, and the ground terminal passed through the terminal hole to the exterior.  
      Another aspect of the present invention is to provide a method of fabrication of a filter comprising the steps of soldering a resistance, an electric induction coil, two Y capacitance electronic components and a ground terminal to a box body at one side of an insertion seat and soldering one end of the positive terminal of a conductive wire and the negative terminal of the conductive wire to the electronic modules to form an electronic loop of the filter; preparing a metallic housing having a terminal hole and a conductive wire hole at the bottom section thereof; mounting in sequence an isolation mount with isolating magnetic wave function and a metallic housing onto a mold by soldering at the connection thereof; passing the terminal of the positive conductive wire and the negative conductive wire into the metallic housing via the conductive wire hole, and exposing to the exterior at the other end via the isolation mount, and inserting one side of the insertion seat to the metallic housing and exposing the ground terminal via the terminal hole to the exterior, and mounting an insulation rubber mount onto the exterior of the isolation mount.  
      The foregoing object and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts.  
      Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.  
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       FIG. 1  is a perspective exploded view of the filter structure of the present invention.  
       FIG. 2  is a partial sectional view of the filter structure of the present invention.  
       FIG. 3  is a schematic view showing the installation of the insertion seat of the filter structure of the present invention.  
       FIG. 4  is a schematic view showing the installation of the metallic housing of the filter structure of the present invention.  
       FIG. 5  is a schematic view showing the installation of the insertion seat and the metallic housing of the filter structure of the present invention.  
       FIG. 6  is a perspective exploded view of the filter structure of the present invention.  
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
      The following descriptions are of exemplary embodiments only, and are not intended to limit the scope, applicability or configuration of the invention in any way. Rather, the following description provides a convenient illustration for implementing exemplary embodiments of the invention. Various changes to the described embodiments may be made in the function and arrangement of the elements described without departing from the scope of the invention as set forth in the appended claims.  
      Referring to  FIGS. 1 and 2 , there is shown a filter structure and a method of fabrication of the filter. The filter comprises an insertion seat  1  having a positive terminal pin, a negative terminal pin and a ground terminal pin (not shown) respectively extended to another lateral side, and the lateral side being correspondingly mounted with a positive terminal pin  10 , a negative terminal pin  11  and a ground terminal pin  12 , and the lateral side connected to a box body  13 . The box body  13  contains a resistance  14 , an electric induction coil  15  and two Y capacitance electronic modules, and a cover  130  is used to cover the box body  13 . The external side of the box body  13  is provided with a ground terminal  17 , wherein the resistance  14 , the electric induction coil  15 , the Y capacitance  16  and the ground terminal  17  are respectively soldered to the positive terminal pin  10 , the negative terminal pin  11  and the ground terminal pin  12  which are interconnected to form an electronic loop of the filter of the present invention. The positive terminal and the negative terminal of the electronic loop are respectively soldered to a positive conductive wire  18  and a negative conductive wire  19 .  
      The metallic housing  2  has an opened cavity  20  at one lateral side for the mounting of the insertion seat  1  at one lateral side. The bottom end of the cavity  20  is a terminal hole  21  and a conductive wire hole  22 . The conductive wire hole  22  externally extended to connect with an isolation mount  23 , which is elongated and is a metallic net functioning to isolate electromagnetic wave. One end of the isolation mount  23  and the metallic housing  2  are connected by soldering, and the external of the isolation mount  23  is then mounted with an insulation rubber mount  24  so that the isolation mount  23  is covered within. One end of the positive conductive wire and the negative conductive wire are inserted from the hole  22  via the isolation mount  23  and extended to the exterior. The ground terminal  17  passes through the hole  21  to the external thereof  
      FIGS.  3  to  5  shows the method of fabrication of the filter in accordance with the present invention.  
      In accordance with the present invention, the method of fabrication comprises the following steps:  
     
         
         
           
              (a) soldering a resistance  14 , an electric induction coil  15 , two Y capacitance  16  electronic components and a ground terminal  17  to a box body  13  at one side of an insertion seat  1  and soldering one end of the positive conductive wire  18  and a negative conductive wire  19  to the electronic modules to form an electronic loop of the filter, as shown in  FIG. 3 ;  
              (b) preparing a metallic housing  2  having a terminal hole  21  and a conductive wire hole  22  at the bottom section thereof;  
              (c) mounting in sequence an isolation mount  23  with isolating magnetic wave function and the metallic housing  2  onto a mold  3  by soldering at the connection thereof, as shown in  FIG. 4 , wherein the mold  3  has a molding block  31  and the molding block  31  is provided with a mold pillar  32 , and the isolation mold  23  and the metallic housing  2  are combined by extending one end of the isolation mount  23  to form a flat portion as a soldering section  230  and then one end of the soldering section  230  is mounted to the molding pillar  31 , and the soldering connection section  230  is flatly mounted to the top section of the molding block  31  and after that the conductive wire hole  22  passes through the other end of the isolation mount  23  and the metallic housing  2  is inserted to the molding block  31  and the connection region is then soldered;  
              (d) passing the terminal of the positive conductive wire  18  and the negative conductive wire  19  into the metallic housing  2  via the conductive wire hole  22 , and exposing to the exterior at the other end via the isolation mount  23 , and inserting one side of the insertion seat  1  to the metallic housing  2  and exposing the ground terminal  17  via the terminal hole  21  to the exterior; and  
              (e) mounting an insulation rubber mount  24  onto the exterior of the isolation mount  23 ; and  
              (f) rolling the end portion of the isolation mount  23  into thread and protrudedly exposed at the external of the insulation rubber mount  24 .  
           
         
       
    
      Accordingly, a filter with conductive wire is formed in accordance with the present invention.  
      In accordance with the present invention, the positive conductive wire  18  and the negative conductive wire  19  are fully covered by the isolation mount  23 , and the isolation mount  23  has the effect of isolating electric magnetic wave. Thus, the filter, by means of the extension of the appropriate length of the positive conductive wire  18  and the negative conductive wire  19 , provides a convenient effect without occupying space. Besides, the electronic magnetic wave is eliminated.  
      It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above.  
      While certain novel features of this invention have been shown and described and are pointed out in the annexed claim, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention.