Patent Publication Number: US-2005133908-A1

Title: Chip assembly with glue-strengthening holes

Description:
BACKGROUND OF THE INVENTION  
      1. Field of the Invention  
      The present invention relates to a chip assembly and, more particularly to a chip assembly with glue-strengthening holes for use in a semiconductor-packaging field, thereby to assist the chip cooled, and a heat-dissipating plate and a substrate can be securely combined as a heat-dissipating structure.  
      2. Description of the Related Art  
      Please referring to  FIG. 1 , a convention heat-dissipating structure for use in a semiconductor-packaging field, which includes a substrate  80  on which a chip  81  is arranged and a heat-dissipating plate  90  made of a metal material with the better heat conduction. The heat-dissipating plate  90  is covered on the chip  81  and the substrate  80 . The heat-dissipating plate  90  has a peripheral frame  91  at its bottom. The peripheral frame  91  is securely pasted on the substrate  80  by glue  100 . The heat-dissipating structure is contacted with the chip  81  through the heat-dissipating plate  90 , thereby enabling the heat of the chip  81  to be guided out and to prevent the chip  81  from being damaged due to an external force.  
      However, the above heat-dissipating structure uses the glue  100  to paste the heat-dissipating plate  90  on the substrate  80 , hence it will generate the worse combined strength. Because it is difficult to pass the experiment of the stretching test, it will be extremely trouble for operators.  
      Accordingly, the convention heat-dissipating structure has drawbacks in practical use. The present invention aims to resolve the above problems in the prior art.  
     SUMMARY OF THE INVENTION  
      It is therefore a principal object of the invention to provide a chip assembly with glue-strengthening holes for use in a semiconductor-packaging field. Furthermore, the glue-strengthening holes will be filled through the glue for generating a griping strength, thereby to assist the chip cooled, and the heat-dissipating plate and the substrate can be securely combined together, accordingly.  
      To achieve the above object, the present invention provides a chip assembly with glue-strengthening holes. The chip assembly comprises a substrate, a heat-dissipating plate and glue. The heat-dissipating plate is made of a metal material, and the heat-dissipating plate has a peripheral frame projected from a bottom thereof and a plurality of holes correspondingly formed on the peripheral frame. The glue is pasted between the peripheral frame of the heat-dissipating plate and the substrate.  
      To provide a further understanding of the invention, the following detailed description illustrates embodiments and examples of the invention, this detailed description being provided only for illustration of the invention.  
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
      The drawings included herein provide a further understanding of the invention. A brief introduction of the drawings is as follows:  
       FIG. 1  is a cross-sectional view of a heat-dissipating structure of prior art;  
       FIG. 2  is an exploded perspective view of a first embodiment of the present invention;  
       FIG. 3  is a perspective view of a first embodiment of the present invention;  
       FIG. 4  is a cross-sectional view of a first embodiment of the present invention;  
       FIG. 5  is a cross-sectional view of a second embodiment of the present invention;  
       FIG. 6  is a cross-sectional view of a third embodiment of the present invention;  
       FIG. 7  is a cross-sectional view of a fourth embodiment of the present invention;  
       FIG. 8  is a perspective view of a heat-dissipating plate of a fifth embodiment of the present invention;  
       FIG. 9  is a cross-sectional view of the heat-dissipating plate of a sixth embodiment of the present invention;  
       FIG. 10  is a perspective view of the heat-dissipating plate of a seventh embodiment of the present invention;  
       FIG. 11  is a cross-sectional view of the seventh embodiment of the present invention;  
       FIG. 12  is a cross-sectional view of an eighth embodiment of the present invention;  
       FIG. 13  is a cross-sectional view of a ninth embodiment of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS  
      Wherever possible in the following description, like reference numerals will refer to like elements and parts unless otherwise illustrated.  
      Referring to  FIGS. 2-4 , the present invention provides a chip assembly with glue-strengthening holes including a substrate  10  and a heat-dissipating plate  20 . The substrate  10  is a square board on which a chip  11  is arranged.  
      The heat-dissipating plate  20  is made of a metal material with the better heat conduction and can be a substantial square board. The heat-dissipating plate  20  has a peripheral frame  21  projected from its bottom. The peripheral frame  21  is surrounded on a circumference of the bottom of the heat-dissipating plate  20 . The peripheral frame  21  is surrounded on a circumference of the bottom of the heat-dissipating plate  20 . The heat-dissipating plate  20  has a plurality of holes  22  correspondingly formed on the peripheral frame  21 . The holes  22  each are defined as a penetrating hole. The holes  22  each are defined as a T shaped hole (shown in  FIG. 4 ), a cone hole (shown in  FIG. 5 ), a sandglass shaped hole (shown in  FIG. 6 ), or a screwed hole (shown in  FIG. 7 ). The holes  22  each having a large upper opening and a small lower opening can increase the combined strength of the heat-dissipating plate  20  and the substrate  10 .  
      When the heat-dissipating plate  20  will be combined with the substrate  10 , the glue  30  is coated on a joint between the substrate  10  and the peripheral frame  21  of the heat-dissipating plate  20 . Then the heat-dissipating plate  20  is covered on the chip  11  arranged on the substrate  10 , so that the bottom surface of the peripheral frame  21  of the heat-dissipating plate  20  can be pasted on the substrate  10  by the glue  30 . When the heat-dissipating plate  20  is pressed downwardly, the glue  30  between the heat-dissipating plate  20  and the substrate  10  is spilled into the holes  22 . Furthermore, the glue  30  is filled in the holes  22  of the heat-dissipating plate  20  for generating a griping strength.  
      As shown in  FIG. 8 , the peripheral frame  21  of the heat-dissipating plate  20  has a plurality of tooth surfaces  23  formed on an inner wall thereof, and the tooth surfaces  23  each have a reversed angle  24  (shown in  FIG. 9 ), so that the glue  30  is filled between the tooth surfaces  23  of the heat-dissipating plate  20  for generating a griping strength.  
      Additionally, as shown in  FIG. 10 , the peripheral frame  21 ′ is downwardly bent and horizontally extended from a peripheral of the heat-dissipating plate  20 ′. The holes  22 ′ are respectively distributed on four corners of the peripheral frame  21 ′. The holes  22 ′ each are defined as a penetrating hole (shown in  FIG. 11 ), a screwed hole (shown in  FIG. 12 ) and a trumpet shaped hole (shown in  FIG. 13 ).  
      From the foregoing description, the chip assembly in accordance with the present invention has the following advantages: 
          1. By the heat-dissipating plate  20  contacted with the chip  11 , the heat-dissipating plate  20  will guide out the heat of the chip  11  and assist the chip  11  cooled.     2. By the holes  22  arranged on the heat-dissipating plate  20 , the glue  30  can spill into the holes  22  for generating a griping strength, and hence it will generate the better-combined strength between the heat-dissipating plate  20  and the substrate  10 .        

      Furthermore, it will be able to pass the experiment of the stretching test, thereby to reduce defective fraction of the product.  
      Those skilled in the art will readily appreciate that the above description is only illustrative of specific embodiments and examples of the invention. The invention should therefore cover various modifications and variations made to the herein-described structure and operations of the invention, provided they fall within the scope of the invention as defined in the following appended claims.