Abrading – Abrading process – Glass or stone abrading
Reexamination Certificate
2006-12-13
2011-10-18
Rachuba, Maurina (Department: 3727)
Abrading
Abrading process
Glass or stone abrading
C451S056000, C125S011040, C125S011180
Reexamination Certificate
active
08038511
ABSTRACT:
According to the present invention, in a method for subjecting a roughly ground chamfer portion of a semiconductor wafer to helical grinding by relatively inclining the wafer and a second grinding stone to perform precise grinding, an edge portion of a discoid truer is formed into a vertically asymmetrical groove shape of a first grinding stone by using the first grinding stone having a vertically asymmetrical groove formed on a periphery thereof to grind the edge portion of the truer by the groove of the first grinding stone without being relatively inclined, a groove is formed on a periphery of the second grinding stone by relatively inclining the truer and the second grinding stone to subject the second grinding stone to helical grinding, and the chamfer portion of the wafer is precisely ground based on helical grinding by relatively inclining the semiconductor wafer with respect to a direction of the groove formed on the periphery of the second grinding stone. As a result, there is provided the method for machining a chamfer portion of the semiconductor wafer, which can machine the chamfer portion of the wafer into a vertically symmetrical shape when subjecting the chamfer portion of the semiconductor wafer to helical grinding, e.g. a resin grinding stone and the like.
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Sekine Takashi
Yamazaki Eiichi
Oliff & Berridg,e PLC
Rachuba Maurina
Shin-Etsu Handotai & Co., Ltd.
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