Abstract:
An electrical connector includes an insulating housing defining a mounting surface and several contacts received in the housing. The contacts include soldering tails abutting against the mounting surface. The insulating housing has air holes running through the mounting surface to align with the corresponding soldering tails.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to an electrical connector, and more particularly to an electrical connector with a high quality of soldering. 
         [0003]    2. Description of Related Art 
         [0004]    Electrical card connectors are usually mounted on PCBs of the electronic devices to establish data transmission between the cards and the electronic devices. An electrical connector comprises a connector body, a metallic shell covering above the connector body, a supporting member moveably assembled into the connector body, and a terminal module. The connector body includes a pair of side walls commonly defining a receiving space in which the terminal module is received. The terminal module includes a plurality of contacts and a body for retaining the contacts. Each contact includes a soldering tail, a bend portion and a horizontal portion disposed between the soldering tail and the bend portion. The solder portion is welded to external device by SMT (Surface Mounted Technology). Nevertheless, it may bring blisters in the solder when welding. 
         [0005]    Hence, an electrical card connector with a high quality of soldering quality is desired. 
       BRIEF SUMMARY OF THE INVENTION 
       [0006]    Accordingly, an object of the present invention is to provide an electrical card connector with a better soldering quality of contacts. 
         [0007]    To achieve the above object, an electrical connector comprises an insulating housing defining a mounting surface and several contacts received in the housing. The contacts comprise soldering tails abutting against the mounting surface. The insulating housing has air holes running through the mounting surface to align with the corresponding soldering tails. 
         [0008]    Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0009]      FIG. 1  is an exploded view of an electrical card connector in accordance with a preferred embodiment of the present invention; 
           [0010]      FIG. 2  is an assembled view of the electrical card connector as shown in  FIG. 1 ; 
           [0011]      FIG. 3  is another assembled view of the electrical card connector as shown in  FIG. 1 ; 
           [0012]      FIG. 4  is a cross sectional view of the electrical card connector as shown in  FIG. 1 . 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0013]    Reference will now be made to the drawing figures to describe the preferred embodiment of the present invention in details.  FIGS. 1˜3  illustrates an electrical card connector  100  for insertion of a card (unshown). The electrical card connector  100  includes an insulating housing  1 , a plurality of contacts  2  retained in the insulating housing for data transmission and a metal cover  3  shielding the insulating housing. The metal cover  3  is attached to the insulating housing  1  to define a card receiving space for receiving the card. 
         [0014]    The insulating housing  1  includes a base portion  11  and a pair of opposite side walls  12  extending vertically from the corresponding edges of the base portion  11 . The base portion  11  defines a mating face (the upper face)  118  and a mounting face  119  (the bottom face). The mating face confronts with the inserted card. Two rows of terminal passageways  13  are disposed between the opposite side walls  12  and each terminal passageway extends parallel to the sidewall and runs through the mating and mounting face. The mounting face  119  defines several square shallow depressions  111  communicating with corresponding terminal passageways through the adjacent end face perpendicular to the mating face of the insulating housing  1 . 
         [0015]    The contacts  2  are retained in the housing  1  by injection molding, having horizontal fixed sections  21 , contacting sections  22  extending in the corresponding terminal passageway and exposed to the mating face  118  and solder sections  23  flatting against the mounting face  119 . Each fixed section includes a long arm  211  and a short arm  212  parallel to the long arm. The long arm  211  is configured at the center of the base portion  11 , in a partition portion between said two rows of the passageways, while the short arm is disposed near the end faces of the housing. The contacting sections extend parallel to the side walls  12  from the long arms towards the short arms. The short arm  212  has a recess  213  facing the contacting section  22 . The recesses  213  allow to accommodate free distal ends of the contacting section  22  when the contacts are urged to downward in the terminal passageways. The solder section  23  extends downwards from the short arm  212  to be accommodated in the shallow depressions  111  so that the solder sections are in a small plane. The solder section  23  further defines a pair of semi-circular notches  231  at both sides thereof parallel to the side walls. 
         [0016]    The insulating housing  1  further comprises a plurality of small air holes  112  corresponding to the solder section  23 . The air holes run through the mating face  118 , the mounting face  119  and the shallow depressions  111 . The air holes are aligned with corresponding solder sections one by one and communicate with an exterior of the insulating housing. 
         [0017]    Referring to  FIGS. 1  and  FIGS. 3 , the shell  3  includes a main part  31  and a pair of fixed parts  32  extending from both sides of the main part. Each fixed part  32  has at least two locking holes  321  for matching with the lock portions  122  set in the side wall&#39;s cave  121 . The locking holes  321  are horizontally arranged. The shell extends solder tails  322  from the fixed parts. The solder tails  322  are welded to the printed circuit board (unshown). 
         [0018]    When soldering, solder material is able to flow into the semi-circular notches  231  and surround the solder section  23 , but not put the solder section up. Meanwhile, the air holes  112  are through the housing  1 , so there will be no air bubbles forming in the solder material. With the notches  231  of the solder section and the air holes  112 , it improves the solder quality of the contacts obviously.