Patent Publication Number: US-2005117046-A1

Title: Image sensor module and method for manufacturing the same

Description:
BACKGROUND OF THE INVENTION  
      1. Field of the Invention  
      The invention relates to an image sensor module and a method for manufacturing the same, and in particular to image sensor module that is easy to be assembled, disassembled and effectively positioned.  
      2. Description of the Related Art  
      Referring to  FIG. 1 , a conventional image sensor module includes a lens holder  10 , a lens barrel  20 , and an image sensor  30 . The lens holder  10  has an upper end face  12 , a lower end face  14  and an opening  16  penetrating through the lens holder  10  from the upper end face  12  to the lower end face  14 . An internal thread  18  is formed on an inner wall of the opening  16  of the lens holder  10 . The lens barrel  20  formed with an external thread  22  is inserted from the upper end face  12  of the lens holder  10 , received within the opening  16 , and screwed to the internal thread  18  of the lens holder  10 . The lens barrel  20  is formed with a transparent region  24  under which an aspheric lens  26  and an infrared filter  28  are arranged in sequence. The image sensor  30  has a substrate  31 , which has a first surface  32  and a second surface  33  opposite to the first surface  32  on which a frame layer  36  is arranged. The first surface  32  is formed with first connected point  34 . The second surface  33  is formed with second connected point  35 . The photosensitive chip  37  is mounted on the first surface  32  of the substrate  31  and electrically connected to the first connected point  34  by wires  38 . A transparent layer  39  is adhered to the frame layer  36  for encapsulating the photosensitive vhip  37  and wires  38 .  
      The image sensor  30  is bonded to the lower end face  14  of the lens holder  10  through the transparent layer  39 . The screwed length between the lens barrel  20  and the lens holder  10  may be adjusted to control the distance from the aspheric lens  26  of the lens barrel  20  to the transparent layer  39  of the image sensor  30 .  
      The above-mentioned image sensor module has the following drawbacks.  
      Because the aspheric lens  26  and an infrared filter  28  are bonded within the lens barrel  20 , it is complicate to be assembled . And the aspheric lens  26  and an infrared filter  28  are easily damage.  
      It is an important subject of the invention to provide an image sensor module, which is easy to be assembled, disassembled, and effectively positioned.  
     SUMMARY OF THE INVENTION  
      An object of the invention is to provide an image sensor module for miniaturizing the product equipped therewith.  
      Still another object of the invention is to provide an image sensor module capable of precisely positioning so as to facilitate the manufacturing processes.  
      To achieve the above-mentioned objects, the invention provides an image sensor module includes an image sensor package formed with a top end face having a transparent layer and a bottom end face. A lens holder is formed with a chamber, which has an internal thread formed at the inner wall, so that the transparent layer of the image sensor package is arranged at the lens holder. A lens barrel is inserted within the chamber of the lens holder, and is formed with an external thread, which is screwed on the internal thread of the lens holder. The lens barrel is formed with an opening and a hole communicating the opening, which is formed with a first positioned slot for positioning an aspheric lens. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       FIG. 1  is a schematic illustration showing a conventional image sensor module.  
       FIG. 2  is a first schematic illustration showing an image sensor module of the invention.  
       FIG. 3  is a second schematic illustration showing the image sensor module of the invention. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION  
      Referring to  FIG. 2 , an image sensor module of the invention includes an image sensor package  40 , a lens holder  42 , and a lens barrel  44 .  
      The image sensor package  40  includes a substrate  46 , a frame layer  56 , a photosensitive chip  60 , a transparent layer  64 . The substrate  46  is formed with a top end face  48  on which first connected points  52  are formed, and a bottom end face  50  on which second connected points  54  are formed. The frame layer  56  is arranged on the top end face  48  of the substrate  46 . A chamber  58  is defined between the substrate  46  and the frame layer  56 . The photosensitive chip  60  is arranged within the chamber  58 , and electrically connected the first connected points  52  by wires  62 . The transparent layer  64  is a piece of glass, which is adhered on the frame layer  56  for encapsulating the photosensitive chip  60  and wires  62 .  
      The lens holder  42  is formed with a chamber  66 , which has an internal thread  68  formed at the inner wall of the chamber  66 , so that the transparent layer  64  of the image sensor package  40  is arranged at the lens holder  42 .  
      The lens barrel  44  is inserted within the chamber  66  of the lens holder  42 , and is formed with an external thread  70 , which is screwed on the internal thread  68  of the lens holder  42 . The lens barrel is formed with an opening  72  and a hole  74  communicating the opening  72 , which is formed with a first positioned slot  80  for positioning an aspheric lens  76  and a second positioned slot  82  under the first positioned slot  80  for positioning an infrared filter  78 . The lens barrel  44 , aspheric lens  76 , and the infrared filter  78  are integrated formed by injecting molded.  
      A method for manufacturing the image sensor module of the present invention includes following steps of: 
          Providing an image sensor package  40  includes a substrate  46 , a frame layer  56 , a photosensitive chip  60 , a transparent layer  64 . The substrate  46  is formed with a top end face  48  on which first connected points  52  are formed, and a bottom end face  50  on which second connected points  54  are formed. The frame layer  56  is arranged on the top end face  48  of the substrate  46 . A chamber  58  is defined between the substrate  46  and the frame layer  56 . The photosensitive chip  60  is arranged within the chamber  58 , and electrically connected the first connected points  52  by wires  62 . The transparent layer  64  is a piece of glass, which is adhered on the frame layer  56  for encapsulating the photosensitive chip  60  and wires  62 .     Providing a lens holder  42  is formed with a chamber  66 , which has an internal thread  68  formed at the inner wall of the chamber  66 , so that the transparent layer  64  of the image sensor package  40  is arranged at the lens holder  42 .     Providing a lens barrel  44  is inserted within the chamber  66  of the lens holder  42 , and is formed with an external thread  70 , which is screwed on the internal thread  68  of the lens holder  42 . The lens barrel is formed with an opening  72  and a hole  74  communicating the opening  72 , which is formed with a first positioned slot  80  for positioning an aspheric lens  76  and a second positioned slot  82  under the first positioned slot  80  for positioning an infrared filter  78 . The lens barrel  44 , aspheric lens  76 , and the infrared filter  78  are integrated formed by injecting molded        

      Please referring to  FIG. 3 , is a second schematic illustration showing the image sensor module of the invention. Wherein the transparent layer  64  of the image sensor package  40  is an infrared filter  78 . Still the infrared filter  78  of the lens barrel  44  may be omitted.  
      The image sensor module of the invention, in which the lens barrel  44 , the aspheric lens  76 , and the infrared filter  78  are integrated formed by injecting molded, has the following advantages. 
          1. Still the image sensor module is capable of precisely positioning so as to facilitate the manufacturing processes.        

      While the invention has been described by 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. To 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.