Apparatus for laser exposure of a substrate disk and a method fo

Details Apparatus for laser exposure of a substrate disk and a method fo Apparatus for laser exposure of a substrate disk and a method fo

1996-11-27

1998-07-07

Levy, Stuart S.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Specific detail of storage medium support or motion production

369264, 369271, 369282, 360 9912, G11B 2300, G11B 2504

Patent

active

057779791

ABSTRACT:
A vertically disposed drive spindle (5) rotates turntable (6) supporting a substrate (7) at high speed, the turntable having a smaller diameter than the substrate. Coaxial with the turntable (6), a centering ring (10) having a frustoconical inside surface can be raised vertically between a lower and upper position. The latter has on its upper side a greater diameter and on its lower side a smaller diameter than the substrate (7). In its lower position the centering ring (10) is at a distance from a substrate (7) lying on the turntable (6), but in its upper position its inside surface supports the substrate (7) at an axial distance above turntable (6).

REFERENCES:
patent: 4470054 (1984-09-01), Wrobel
patent: 4933927 (1990-06-01), Ross
patent: 5043973 (1991-08-01), Ocheltree et al.
patent: 5054016 (1991-10-01), D'Alayer et al.
patent: 5069156 (1991-12-01), Suzuki
patent: 5583845 (1996-12-01), Aki
patent: 5601645 (1997-02-01), Nonomura et al.

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