Disc master drying cover assembly
US6013316A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 7, 1998 |
| Grant date | Jan 11, 2000 |
| Priority date | — |
| Expiry date | Feb 7, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/162
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.