Patent Publication Number: US-2007108544-A1

Title: Image sensor with a compound structure

Description:
BACKGROUND OF THE INVENTION  
      1. Field of the Invention  
      The invention relates an image sensor with a compound layer, and particular to a structure for packaging different size chip, the manufacturing cost may be decreased, and the size of the package may be decreased.  
      2. Description of the Related Art  
      Referring to  FIG. 1 , it is an image sensor structure includes a substrate  10 , a frame layer  18 , a photosensitive chip  26 , a plurality of wires  28 , and a transparent layer  34 .  
      The substrate  10  has a first surface  12  on which plurality of first electrodes  15  are formed, and a second surface  14  on which plurality of second electrodes  16  are formed. The first electrodes  15  are corresponding to electrically connect to the second electrodes  16  by the conductive wires  17 , which are located at the side of the substrate. The frame layer  18  has an upper surface  20  and a lower surface  22  adhered to the first surface  12  of the substrate  10  to form a cavity  24  together with the substrate  10 . The photosensitive chip  26  is arranged within the chamber  24 , and is mounted to the first surface  12  of the substrate  10 . Each wire  28  has a first terminal  30  and a second terminal  32 . The first terminals  30  are electrically connected to the photosensitive chip  26 , and the second terminals  32  are electrically connected to the first electrodes  15  of the substrate  10 . The transparent layer  34  is adhered to the upper surface  20  of the frame layer  18 .  
     SUMMARY OF THE INVENTION  
      An objective of the invention is to provide an image sensor with a compound structure, and capable of decreasing the manufacturing cast of the image sensor.  
      An objective of the invention is to provide an image sensor with a compound structure, and capable of decreasing the size of the structure.  
      To achieve the above-mentioned object, the invention includes an image sensor with a compound layer includes a substrate, a chip, wires, a compound layer, and a transparent layer. The substrate has an upper surface, which is formed with a central region and first electrodes arranged at the each side of the central region, and a lower surface, which is formed with second electrodes. The chip is mounted at the central region of the upper surface of the substrate, the chip has a sensor region and a plurality of bonding pads. The wires are electrically connected the bonding pads of the chip to the first electrodes of the substrate. The compound layer is located on the side of the chip and is covered on the wires. The transparent layer is arranged on the compound layer to cover the chip, so that the sensor region of the chip may be received optical signal through the transparent layer. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       FIG. 1  is a schematic illustration showing a conventional image sensor structure.  
       FIG. 2  is a cross-sectional view illustration showing an image sensor with a compound structure.  
       FIG. 3  is a first schematic illustration showing an image sensor with a compound structure.  
       FIG. 4  is a second schematic illustration showing an image sensor with a compound structure. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION  
      Please refer to  FIG. 2  and  FIG. 3 , an image sensor package structure of the present invention includes substrate  40 , a chip  42 , wires  44 , a compound layer  46 , and a transparent layer  48 .  
      The substrate  40  has an upper surface  5 O, which is formed with a central region  54  and first electrodes  56  arranged at the each side of the central region  54 , and a lower surface  52 , which is formed with second electrodes  58  corresponding to electrically connect to the first electrodes  56 .  
      The chip  42  is mounted at the central region  54  of the upper surface  50  of the substrate  40 , the chip has a sensor region  60  and a plurality of bonding pads  62  are located at the side of the sensor region  54  of the chip  42 .  
      The plurality of wires  44  are electrically connected the bonding pads  62  of the chip  42  to the first electrodes  56  of the substrate  40 , so that the signal from the chip  42  is transmitted to the second electrodes  58  of the substrate  40  through the first electrodes  56 .  
      Please refer to  FIG.4 , the compound layer  48  is formed of epoxy, is located on the side of the chip  40  and covered on the wires  44 , so that the sensor region  60  of the chip  40  is exposed from the compound layer  48 , then, to cut the compound layer  48  to form a single structure of image sensor.  
      The compound layer  48  is formed with a cavity  64  for locating the transparent layer  48 .  
      While the invention has been described by the way of an example and in terms of a preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiment. On the contrary, it is intended to cover various modifications. Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications.