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    The rework study and simulation on solder bridging of TuMR magnetic head
    (2012-08-08)
    Roajanasiri, Reangroaj
    ;
    Afzulpurkar, Nitin
    ;
    Boonsang, Siridech
    The Hard Disk Drive is the important storage component in computer. The high volume of Hard Disk Drive manufacturing is required. The cost improvements are strictly focused on yield, direct material, indirect material, and operation cost. The defect reduction is a important key to improve cost. The small percentage of defect reduction will contribute the huge profit for manufacturing due to the high volume manufacturing. The defect rework is a good idea to bring back profit from the scrap cost and the waste eliminate cost. This paper will show a alternative rework area on solder bridging defect which is a major defect in Head Gimbals Assembly process. The reworking process considers the product function and critical parameters. © 2012 IEEE.
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    The simulation of solder bridging on TuMR magnetic head connector
    (2012-03-16)
    Roajanasiri, Reangroaj
    ;
    Afzulpurkar, Nitin
    ;
    Boonsang, Siridech
    The Hard Disk Drive is the important components in the present computer. The Hard Disk Drive manufacturing need high productivity and cost improvement to support the market needs. Many cost reduction are done on product design, material cost and manufacturing operation. This work shows an idea to improve productivity and also reduce the scrap cost by rework process. The product performance will be considered to prevent the reduction of reliability and degradation. © (2012) Trans Tech Publications, Switzerland.
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    A solder bridging rework study and an experimental investigation of the TuMR magnetic head
    (2012-01-01)
    Roajanasiri, Reangroaj
    ;
    Afzulpurkar, Nitin
    ;
    Boonsang, Siridech
    The TuMR reader was designed with high sensitivity for high areal density magnetic recording in the hard disk drive. The assembly process requires the use of solder jet welding on small connectors in the head circuit. The solder bridging problem is the cause of the major mechanical yield loss. This work considers how to resolve the bridging problem without degrading the TuMR sensor by examining the use of Nd:YAG laser reheating. The use of double laser pulses yields better results than the use of single pulses. The critical parameters of the TuMR sensor are monitored with the Quasi tester. © IEICE 2012.