Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Patent
1997-04-04
2000-07-18
Chen, Vivian
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
428 641, 428 662, 428195, 428206, 4284111, 4283055, 4283105, 4283166, 4283179, 4283184, 4283193, 4283199, 4283202, 4283211, 4283213, 4283215, 4283227, 428421, 428422, 4284231, 428492, 428522, 428 14, 451 6, 451 21, 451 41, 451285, 451286, 451287, 451288, 451526, 451533, 451534, 451538, 451921, B32B 300, B32B 326, B32B 2706, B32B 2720
Patent
active
060904755
ABSTRACT:
The present invention is directed to polishing pads useful in determining an end to the useful wear life thereof. In a simple embodiment of the present invention, a polishing pad that is used with slurries is dyed on one side in a manner that causes the dye to permeate the pad to a limited depth that does not cause total coloring. Another embodiment of the present invention involves a fixed abrasive pad that has fixed abrasives embedded into the pad to a selected depth where at least one color level is within the portion of the pad that contains the fixed abrasives. After dyeing the pad, the pad is attached to the polishing platen. During the polishing operation, a color change signals a time to stop the polishing operation and change the pad. With multiple colors in the pad, limited only by the ability to dye the pad with uniform depth levels, characteristic wear patterns can be observed and adjustments made accordingly to prolong and optimize pad life. A pad having voids and optional abrasives incorporated therein is also disclosed. The contents of each void facilitates the detection of the degree to which the polishing pad has been worn during a polishing operation. Substances may be stored within voids that are released by the breach of the voids caused abrasion during the polishing operation. Visual or audible diagnostics resulting from the breaching of voids are useful to control the polishing operation and thus increase yield.
REFERENCES:
patent: 5733176 (1998-03-01), Robinson et al.
patent: 5736427 (1998-04-01), Henderson
Robinson Karl M.
Skrovan John K.
Walker Michael A.
Chen Vivian
Micro)n Technology, Inc.
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