Coated disk substrate having a small thickness region

Details Coated disk substrate having a small thickness region Coated disk substrate having a small thickness region

1997-07-17

1999-11-16

Ometz, David L.

Dynamic information storage or retrieval

Storage medium structure

Specific disc profile

360135, G11B 370, G11B 582

Patent

active

059870036

ABSTRACT:
A disk substrate for use in manufacturing a recording disk therefrom has an outer non-recording area, recording area, inner non-recording area and a central opening. The inner non-recording area includes a small thickness region having a thickness 70 to 90% of the thickness of the recording area and occupying an area 3 to 30% of the entire disk area including the central opening. The outer non-recording area has a large thickness region having a thickness larger than the thickness of the recording area. The disk substrate is free from warp and improves optical characteristics of the resultant disk.

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