Coating processes – Centrifugal force utilized
Patent
1998-02-07
2000-01-11
Bell, Janyce
Coating processes
Centrifugal force utilized
427377, 34 56, 437231, 118 52, B05D 312, B05C 1100
Patent
active
060133163
ABSTRACT:
A spin coater drying cover is disclosed having unique properties and construction to enable accurate control of the drying process of an optically active lamina of a Nitrocellulose Dye Polymer solution on a Polycarbonate disc substrate. The cover is configured with an orientation platform allowing micro adjustment of the angle and distance of a porous gas filter disc of the cover in relation to the optically active layer. The filter, essentially parallel and concentric to the disc substrate, can be varied from a flat, concave or convex camber to cause gas flow over the disc substrate to be such that a variable linear ramp of the optically active lamina can be achieved, with a thicker layer at the periphery than at the center of the disc. This enables deeper data pits to be formed at the difficult to mold outer disc periphery, thus increasing yield in a disc mastering process.
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Bell Janyce
English W. D.
ODME
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