Abstract:
A method for soldering charge coupled device to improve the yield, working efficiency and imperfection of manual soldering. The method includes the steps of heating a base of a tooling by a heating board; putting a circuit broad having solders on the base; melting the solders on the circuit board by the heat conducted from the base; aligning the pins of the charge coupled device to the solders and applying a pressing force to assure a proper contact between the pins and the solders; and removing the tooling from the heating board for cooling.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the invention 
         [0002]    The present invention relates to a soldering method, and more particularly to a method for soldering a charge coupled device and tooling thereof. 
         [0003]    2. Description of Related Art 
         [0004]    Soldering technologies are introduced and developed substantially for the application of metals, and increasingly more soldering technologies are applied in different technical fields particularly at the present time of rapid electronic and industrial advancements. 
         [0005]    Referring to  FIG. 1  for a schematic view of soldering electronic components on a charge coupled device, the surface of an optical sensor on the charge coupled device (CCD)  60  has a capability of storing electric charges, such that when the optical sensor detects any light on the surface of the charge coupled device  60 , the electric charges will act on the sensor, and all signals produced by the optical sensor of the charge coupled device  60  will define a complete screen. Thus, the charge coupled device  60  is usually used as an optical sensor in an image capturing device. 
         [0006]    In general, the charge coupled device  60  is soldered at an application circuit board  62  first before it can be used. However, the existing technology uses a clamping tool  61  as a fixture, and then uses a soldering iron  63  to solder the charge coupled device  60 . In  FIG. 1 , pins  601  of the charge coupled device  60  are arranged in high density, and thus it is relatively difficult to solder the pins  601  to solder joints  602  on the circuit board  62  by the soldering iron  63  manually. Furthermore, the heat resistance of electronic components is low, such that if the temperature of the soldering iron  63  is too high or the soldering iron  63  stays on the solder joints  602  and pins  601  too long, then the charge coupled device  60  will be damaged. Furthermore, solder beadings will be formed easily in a manual soldering process, and such solder beadings are defects that will result short circuits and ruin the appearance of the device. 
         [0007]    If the soldering iron  63  is used to solder the charge coupled device  60  manually, the yield will be lower, and the operation will become more difficult and cause a less satisfactory working efficiency. Therefore, the traditional way of soldering a charge coupled device  60  definitely requires improvements. 
       SUMMARY OF THE INVENTION 
       [0008]    In view of the foregoing shortcomings, the present invention provides a method for soldering a charge coupled device to overcome the foregoing problems of the traditional manual soldering and improve the yield and working efficiency. The method includes the steps of preheating a heating board; preheating a tooling by putting the tooling on the heating board; putting a circuit broad having solders on a base for the preheating to melt the solders; putting the charge coupled device on the circuit board having solders; contacting the pins of the charge coupled device properly with the solders of the circuit board; and removing the tooling from the heating board for cooling. 
         [0009]    The present invention further provides a tooling for soldering a charge coupled device, wherein a fixed substrate and a circuit board having solders are placed on the tooling, and the charge coupled device is soldered onto the fixed substrate. The tooling comprises a base and a pressing apparatus. The base is provided for contacting a heating board, and the base has a plane, and a plurality of fixing pivots on the plane. The fixing pivots are used for fixing the circuit board having solders and a fixed substrate, such that pins on the charge coupled device are aligned with solders on the circuit board having solders. The pressing apparatus is installed at the top of the base for exerting a pressure on the charge coupled device, so that the pins on the charge coupled device can be contacted properly with the solders on the circuit board having solders. 
         [0010]    To make it easier for our examiner to understand the innovative features and technical content of the invention, we use a preferred embodiment together with the attached drawings for the detailed description of the invention, but it should be pointed out that the attached drawings are provided for reference and description but not for limiting the present invention. 
     
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0011]      FIG. 1  is a schematic view of soldering electronic components on a charge coupled device according to a prior art; 
           [0012]      FIG. 2  is a schematic view of a tooling for soldering a charge coupled device in accordance with a preferred embodiment of the present invention; 
           [0013]      FIG. 3  is a schematic view of the connection between a charge coupled device and a circuit board in accordance with a preferred embodiment of the present invention; 
           [0014]      FIG. 4  is a schematic view of soldering a charge coupled device in accordance with a preferred embodiment of the present invention; and 
           [0015]      FIG. 5  is a flow chart of soldering a charge coupled device in accordance with a preferred embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0016]    Referring to  FIG. 2  for a schematic view of a tooling for soldering a charge coupled device in accordance with a preferred embodiment of the present invention, the tooling  1  comprises a base  10  and a pressing apparatus. 
         [0017]    The base  10  includes a plurality of fixing pivots  12  disposed on a plane of the base  10  for fixing the base  10  between a circuit board and a charge coupled device, such that the pins of the charge coupled device are aligned to the solders on the circuit board, and the connection between the circuit board and the charge coupled device will be described later. The base  10  is made of a metal which is preferably a aluminum-aluminum alloy used for conducting heat, when the charge coupled device is soldered. 
         [0018]    The pressing apparatus includes a support portion  20 , a platform  30 , a pressing rod  40 , a pressing block  41 , a resilient element  42 , a pressing limit portion  51 , a protruding rod  52  and a slot  512 , for providing a pressing force. The support portion  20  is disposed between the platform  30  and the base  10 , for supporting the platform  30 . The pressing rod  40  is passed through the platform  30 , and the bottom of the platform  30  has a pressing block  41 . The pressing rod  40  between the pressing block  41  and the platform  30  has a resilient element  42  thereon. The pressing rod  40  above the platform  30  has a protruding rod  52 . The platform  30  has a pressing limit portion  51  disposed on a side of the platform  30 , and the pressing limit portion  51  has a slot  512 . An end of the protruding rod  52  is connected to the pressing rod  40 , and the body of the protruding rod  51  can be moved vertically up and down based on the pressing movement of the pressing rod  40 . 
         [0019]    If a force is applied to the pressing rod  40  to latch the protruding rod  52  to the bottom of the slot  512 , a pressing force will be exerted onto an object pressed by the pressing block  41 . The foregoing pressing apparatus is an embodiment providing a pressing force to a soldering charge coupled device. 
         [0020]    Referring to  FIG. 3  for a schematic view of the connection between a charge coupled device  60  and a circuit board  65  in accordance with a preferred embodiment of the present invention, it shows a charge coupled device  60 , a fixed substrate  64  and a circuit board having solders  65 . The charge coupled device  60  is adhered onto the fixed substrate  64  by a gluing method. The fixed substrate  64  is made of a metal and has two fixing holes  641 , and the circuit board having solders  65  also has two fixing holes  631 . In  FIG. 1 , two fixing pivots  12  pass through the two fixing holes  631  on the circuit board having solders  65  and the two fixing holes  641  on the fixed substrate  64  to connect the fixed substrate  64  and the circuit board having solders  65 , such that a pin  601  of the charge coupled device  60  is aligned with a solder joint  603  of the circuit board having solders  65  having solders. 
         [0021]    Referring to  FIG. 4  for a schematic view of soldering a charge coupled device in accordance with a preferred embodiment of the present invention, the principle of using a tooling of the invention to solder a charge coupled device will be described as follows. Firstly, a heating board  2  is preheated. The heating board  2  includes a temperature display unit  21 , for displaying a temperature on the heating board  2 . If the heating board  2  is preheated to a desired temperature (approximately 260° C.), then a tooling  1  is put on the heating board  2 , so that a base  10  of the tooling  1  can be preheated to the desired temperature. Then, a circuit board having solders  65  is put on a plane of the base  10 , so that the heat on the base  10  can gradually melt the solders on the circuit board having solders  65 . Then, the fixed substrate  64  with the charge coupled device  60  are put on the circuit board having solders  65 , and the fixed substrate  64  and the circuit board having solders  65  are fixed by the fixing pivots  12 , while the pin  601  of the charge coupled device  60  is aligned with the solder of the solder joint  603  of the circuit board having solders  65 . The pressing apparatus is used to apply a pressing force to the charge coupled device  60 , so that the pin  601  of the charge coupled device  60  is secured to the solder of the circuit board having solders  65 . If a force is applied to latch the protruding rod  52  to the bottom of the slot  512 , a pressing force will be exerted onto the charge coupled device  60  to assure a proper contact between the pin  601  and the solder on the solder joint  603 . Finally, the tooling  1  is removed from the heating board  2  for cooling. A fan can be used for cooling the tooling  1 . Since the fixed substrate  64  is made of a metal, the metal can assist dissipating the heat. After the tooling  1  is cooled, the soldered circuit board of the charge coupled device  60  can be removed from the tooling  1 . 
         [0022]    Referring to  FIG. 5  for a flow chart of soldering a charge coupled device in accordance with a preferred embodiment of the present invention, the soldering process comprises the steps of: preheating a heating board  2  to approximately 260° C. (as shown in S 501 ); preheating a tooling  1  by putting the tooling  1  on the heating board  2 , such that a base  10  can be heated to a desired temperature (as shown in S 503 ); putting a circuit board having solders  65  on the base  10 , such that the heat on the base  10  melts the solder of a solder joint  603  on the circuit board having solders  65  (as shown in S 505 ); putting a charge coupled device  60  on the circuit board having solders  65 , and using a pressing apparatus to contact a pin of the charge coupled device  60  with a solder of the circuit board  65  (as shown in S 507 ), wherein the pin  601  of the charge coupled device  60  can be aligned with the solder of the solder joint  603  on the circuit board having solders  65  by the fixing between the fixed substrate  64  and the circuit board having solders  65 ; removing the tooling  1  from the heating board  2  for cooling, after the pin  601  is contacted properly with the solder (as shown in S 509 ); and finally removing the soldered circuit board of the charge coupled device  60  from the tooling  1  (as shown in S 511 ). 
         [0023]    Although the present invention has been described with reference to the preferred embodiments thereof, it will be understood that the invention is not limited to the details thereof. Various substitutions and modifications have been suggested in the foregoing description, and others will occur to those of ordinary skill in the art. Therefore, all such substitutions and modifications are intended to be embraced within the scope of the invention as defined in the appended claims.