Patent Publication Number: US-2005141205-A1

Title: Insulating package structure

Description:
FIELD OF THE INVENTION  
      The present invention relates to an insulating package structure, and in particular to an insulating package structure, wherein an insulating package casing has a larger space for receiving a coil, for example a transformer, while the area of the circuit board occupied by the insulating package casing is not enlarged so that a larger coil can be received.  
     BACKGROUND OF THE INVENTION  
      With reference to  FIG. 1 , a prior art insulating package casing is illustrated. The conductive terminals  11  are exposed out from the lateral sides  12 ,  13  of the insulating package casing  10 . Then each conductive terminals  11  is bended and then extends towards the circuit board by a bottom side of the conductive terminal  30 . However the exposed portions of the conductive terminals will extend the area of the circuit board occupied by the insulating package casing. This is not beneficial for the design since the area of the circuit board is finite, many components must be installed on the circuit and thus it is advantageous to make any element occupy only a small area so that more elements can be installed on the circuit board, while this design waste a great area of the circuit board. Furthermore, this also causes that the coil, such as a transformer, cannot be too larger to be used on the circuit board.  
     SUMMARY OF THE INVENTION  
      Accordingly, the primary object of the present invention is to provide an insulating package structure, wherein an insulating package casing has a larger space for receiving a coil, for example a transformer, while the area of the circuit board occupied by the insulating package casing is not enlarged so that a larger coil can be received.  
      To achieve above objects, the present invention provides an insulating package structure. The structure comprises at least one coil having a winding; each of two ends of the winding being connected to a conductive terminal; and an insulating package casing for packaging the coil and parts of the conductive terminals; a parts of each conductive terminal not enclosed by the insulating package casing being exposed out of a bottom layer of the insulating package casing so as to be connected to a circuit board.  
      The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       FIG. 1  is a perspective view of the prior art.  
       FIG. 2  is a structural view of the present invention.  
       FIG. 3  is an exploded cross sectional view of the present invention.  
       FIG. 4  is cross sectional views showing the contrast of the present invention with respect to the prior art.  
    
    
     DETAILED DESCRIPTION OF THE INVENTION  
      In order that those skilled in the art can further understand the present invention, a description will be described in the following in details. However, these descriptions and the appended drawings are only used to cause those skilled in the art to understand the objects, features, and characteristics of the present invention, but not to be used to confine the scope and spirit of the present invention defined in the appended claims.  
      Referring to  FIGS. 2 and 3 , the structure of the present invention is illustrated. The present invention has the following elements.  
      At least one coil  20  is formed, for example as illustrated in  FIG. 2 , by a winding  21  winding around an iron core  22 . Each of two ends of the winding  21  is connected to a conductive terminal  30 .  
      An insulating package casing  40  serves for packaging the coil  20  and parts of the conductive terminals  30 . A part of each conductive terminal  30  not enclosed by the insulating package casing  40  is exposed out of a bottom layer  41  of the insulating package casing  40  so as to be connected to a circuit board  50 , as shown in  FIG. 4  (the connection is known in the prior art). Thereby a larger coil  20  can be received within the insulating package casing  40 .  
      Referring to  FIG. 4 , the upper side of the  FIG. 4  shows a prior art for packaging a small transformer. In the lower side of  FIG. 4  shows a packaging way according to the present invention. These two packages occupy the same area AA′ in the circuit board  50 . In the prior art, the conductive terminals are extended from a middle part of the lateral sides of the insulating package casing, by the conductive terminals  30  are bended in the lateral side as a ladder shape. However in the present invention, each conductive terminal  30  of the present invention is exposed from the bottom layer of the insulating package casing and thus extends out. Thereby the insulating package casing may occupy the whole area AA′. Thereby it is larger that the prior art.  
      The present invention is thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.