Rewritable optical data storage disk having enhanced flatness

Details Rewritable optical data storage disk having enhanced flatness Rewritable optical data storage disk having enhanced flatness

1998-01-06

1999-10-26

Kiliman, Leszek

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 644, 428 647, 428336, 428694ML, 428694RL, 428694ST, 428694SL, 428900, 427128, 427129, 427131, G11B 566

Patent

active

059724617

ABSTRACT:
A rewritable optical recording disk has a substrate with an increased thickness that is greater than or equal to approximately 1.5 mm and less than or equal to approximately 2.5 mm. The increased thickness of the substrate enhances the flatness of the recording disk relative to a recording plane. In particular, the increased thickness reduces process-induced surface variations such as warpage and tilt, and provides the disk with increased stiffness to resist deflection during use. The enhanced flatness enables data to be recorded on the disk in a consistent manner with greater spatial densities using techniques such as near-field, air-incident recording. The resulting disk thereby yields greater spatial density and data storage capacity.

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