Patent Publication Number: US-8123555-B2

Title: Coaxial electrical connector with anti-wick system

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to the art of electrical connectors, and more particularly to a coaxial electrical connector for being connected to a printed circuit board. 
     2. Description of the Related Art 
     A conventional coaxial connector includes an insulating seat, and a central conductive terminal and a metallic shell both hold in the seat by Injection Molding process. The metallic shell includes a tube portion in which the terminal is located to form a mating end and a soldering leg bending from a bottom edge of the tube portion. When welded the soldering leg on a printed circuit board where the connector is mounted, melted solders wick will happed upwards along insides of the shell, especially into the mating end, resulting in incorrect mating of a counter connector to the connector. 
     Therefore, there is a need to provide a coaxial electrical connector to resolve the above-mentioned problem. 
     SUMMARY OF THE INVENTION 
     Therefore, an object of the present invention is to provide a coaxial electrical connector with an anti-wick system. 
     To fulfill the above-mentioned object, a coaxial electrical connector comprises a metallic shell having a tubular section with an axial direction and a soldering leg, a central contacts having a contacting section extending in the axial direction within the tubular section and a dielectric seat molded so as to hold together said metallic shell and the central contact as a unit. The metallic shell defines a filled groove around an inner face thereof and perpendicular to the axial direction. The filled groove is to receive a projection of the dielectric seat during a cool process of a molded process to form the coaxial electrical connector. 
     Other features and advantages of the present invention will become more apparent to those skilled in the art upon examination of the following drawings and detailed description of preferred embodiments, in which: 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an assembled, perspective view of an electrical connector assembly including thereof a coaxial electrical connector and a printed circuit board according to an embodiment of the present invention; 
         FIG. 2  is an exploded perspective view of the electrical connector assembly of  FIG. 1 ; and 
         FIG. 3  is a cross-sectional view of the electrical connector assembly of  FIG. 1  taken along line  3 - 3  thereof. 
     
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENT 
     Referring to  FIGS. 1 to 3 , a coaxial connector  100  according to an embodiment of the present invention is shown be mounted on and electrically connected to a printed circuit board  200 . The coaxial connector  100  includes a metallic shell  3 , a central contact  2  and a dielectric seat  1  that integrally holds the metallic shell  3  and the central contact  2  as a unit. 
     The metallic shell  3  is made by bending and forming a metal sheet so as to provide a tubular section  31  having an axial line in a plugging direction with a counter connector (not shown) and three leg sections  32  extending outwardly from a bottom  11  of the insulating seat  1 . The tubular section  31  is provided with slot  34  along the axial line and an engaging groove  314  around the outer face  312  thereof which is perpendicular to the axial line, for engagement with an outer conductor of a mating connector (not shown) for preventing separation. The tuber section is further provided with a filled groove  313  around an inner face  311  thereof which is perpendicular to the axial line. The filled groove  313  is configured with a ring shape so as to be filled with insulating materials during the inserted molder process of the connector, resulting in a better engagement of the seat  1  and the metallic shell  3 . After cooling of said process, a projection  10  is formed to in the filled groove  313 . Furthermore, the filled groove  313  has a horizontal face  3131  and which will block the melted solders from wicking upwards. The engaging groove  314  is disposed above a top face  101  of the insulating seat  1 . 
     The soldering legs  32  included a pair of first legs  321 ,  322  symmetrical at two opposite sides of the slot  34  and a second leg  322  between the pair of first legs and at opposite to the slot  34 . The first legs  321 ,  322  are wider than the second leg  323 . 
     The central contact  2  is made by bending and forming a metal sheet so as to provide a contacting section  21  that extends in the axial line within the tubular section  31 , and a radial section  23  that extends outwardly in a radial direction from a bottom of the contacting section  21 . The contact section  21  is made by deep-drawing pressing a metal sheet so as to provide a hollow form having a semi-spherical tip  22  and flared bottom that leads to the radial section  23 . An extension soldering section  24  extends in the radial direction from the radial section  23 , which is adapted to be in contact with the printed circuit board  200 . 
     The insulating seat  1  has recesses  12 ,  13 ,  14  to dispose the soldering legs of the metallic shell  1  on the bottom face  11  thereof. The bottom face further is provided with a recess  15  to dispose the soldering section  24 , which communicates with the middle hole to receive the radial section  23 . 
     While the present invention has been described with reference to preferred embodiments, the description of the invention is illustrative and is not to be construed as limiting the invention. Various modifications to the present invention can be made to preferred embodiments by those skilled in the art without departing from the true spirit and scope of the invention as defined by the appended claims.