Optical phase-change disc

Details Optical phase-change disc Optical phase-change disc

2000-01-19

2000-10-03

Neyzari, Ali

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692751, 369 4413, G11B 726

Patent

active

061282731

ABSTRACT:
An optical phase-change disc comprises a substrate having thereon a spiral groove or concentric grooves for guiding a focused light beam, and a layer structure including a recording layer and protective layers sandwiching therebetween the recording layer. The groove has wobble for recording ATIP (absolute time information) or ADIP (address information). The following relationship between the groove width GW, beam diameter R.sub.0 and wobble amplitude a.sub.w :

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