Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
1995-12-07
1997-10-28
Resan, Stevan A.
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
428 641, 428141, 428156, 428187, 428195, 428337, 428579, 428457, 428426, 428687, 428694SG, 428900, G11B 582
Patent
active
056816367
ABSTRACT:
The present invention relates to a process for producing a substrate for a thin film magnetic data storage disc, the process including the steps of: (a) providing a substrate; (b) printing a masking pattern of ink dots onto at//least a portion of the surface of the substrate by an offset printing process in which the ink to form the masking pattern is transferred from a printing plate to the substrate by an offset printing member and wherein on transfer from the printing plate to the offset member the ink fragments into the ink dots; and (c) etching the unmasked surface of the substrate thereby to texture the substrate surface. The present invention also relates to a substrate for a thin film magnetic data storage disc, the substrate having a roughened surface composed of peaks separated by valleys produced by preferential area etching, the peaks being grouped into a plurality of substantially circular sub-arrays with the sub-arrays forming a regular pattern.
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Pilkington plc
Resan Stevan A.
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