Abrading – Abrading process – Glass or stone abrading
Patent
1996-04-25
1998-11-17
Eley, Timothy V.
Abrading
Abrading process
Glass or stone abrading
451287, 451289, B24B 100
Patent
active
058368078
ABSTRACT:
A number of blocks are reciprocably supported in a polishing apparatus in accordance with this invention, entirely independent of each other so that lifting motion of one block is not transferred to an adjacent block, thus providing flexibility to follow the global curvature of the wafer. The polishing apparatus uses a block of a very hard design to ensure minimal deflection of the block into the microstructure of the wafer. Each block removes a portion of the wafer using relative motion between the block and the wafer. Each block is supported by at least three regions of the wafer during the relative motion, wherein each of the regions has the slowest rate of material removal in a die enclosing that region. In one embodiment, the smallest dimension of a block is approximately three times the size of the side of a die. The three point support and hard design of the blocks ensure local polishing removal uniformity while the independent support of the blocks ensures global uniformity, thus achieving an advantage over the conventional polishing process and apparatus.
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Banks Derris H.
Eley Timothy V.
MacPherson Alan H.
Suryadevara Omkar K.
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