Coating processes – Direct application of electrical – magnetic – wave – or... – Polymerization of coating utilizing direct application of...
Patent
1998-02-19
2000-08-01
Pianalto, Bernard
Coating processes
Direct application of electrical, magnetic, wave, or...
Polymerization of coating utilizing direct application of...
427131, 427132, 427240, 427261, 4273855, 427404, 4274071, 427416, 427558, 427559, 427595, 428 654, 428 655, 428 658, 428694TC, 428694TF, 428900, C08J 704, B05D 512
Patent
active
060963859
ABSTRACT:
A magnetic disk having improved tribological characteristics in the data zone of the disk surface while retaining a low sliding stiction in the landing zone is disclosed. It contains the conventional elements of a substrate, a magnetic recording layer, a protective overcoat, and a lubricant layer on the protective overcoat. However, the lubricant layer is UV irradiated under a photo mask to cause a radially inner zone and a radially outer zone. The photo mask is designed so that the radially outer zone of the lubricant layer has a ratio of bonded/unbonded lubricant molecules greater than that in the radially inner zone. The reduced proportion of mobile lubricant molecules in the data zone prevents the lubricant molecules from being collected by the magnetic head. On the other hand, a large proportion of the lubricant molecules in the landing zone remained mobile. This allowed the sliding stiction in the landing zone to stay at the desiredly low value. All these were achieved with a uniform-thickness lubricating layer, thus ensuring thermodynamically stability.
REFERENCES:
patent: 5650900 (1997-07-01), Wei et al.
Chen Yu-Kun
Lin Jason S.
Lin Moon-Sun
Yong Philip
Liauh W. Wayne
Pianalto Bernard
Trace Storage Tech. Corp.
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