Abrading – Precision device or process - or with condition responsive... – Computer controlled
Reexamination Certificate
2005-02-22
2005-02-22
Nguyen, George (Department: 3723)
Abrading
Precision device or process - or with condition responsive...
Computer controlled
C451S008000, C451S009000, C451S011000, C029S603120, C029S603080
Reexamination Certificate
active
06857937
ABSTRACT:
A head is fabricated using photolithography, and the head is purposely powered up during a material removal process, such as lapping, so that the head's expansion (that would be formed on being powered up during normal usage in a drive) is planarized. Specifically, the head is energized in a manner identical (or similar) to energization of circuitry in the head during normal operation in a drive, even though fabrication of the head has not yet been completed. When energized, a shape that the head would have during normal operation is replicated (or approximated). Therefore, the head's shape includes a expansion of the pole tip region, although the head is only partially fabricated. Thereafter, a portion of the head in the expansion is partially or completely removed, by lapping while energized. The depth of material removal from the head is monitored e.g. by a controller sensitive to a change in electrical characteristic of a device (such as a resistor) that is normally fabricated during photolithography of the head.
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Dr. K. Gilleo et al., “Materials and Processes for MR and GMR Heads and Assemblies”, www.cookonsemi.com/staystik.htm, pp 1-10.
Komag, Inc.
Nguyen George
Silicon Valley Patent & Group LLP
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