Dynamic information storage or retrieval – Systems having plural physically distinct independent tracks... – Having layered storage medium
Patent
1997-08-19
1998-07-21
Edun, Muhammad N.
Dynamic information storage or retrieval
Systems having plural physically distinct independent tracks...
Having layered storage medium
369100, 369112, 369 54, 3692752, G11B 700
Patent
active
057843520
ABSTRACT:
Apparatus and methods for accessing data on a multilayered optical storage medium. The apparatus uses the time-of-flight of illumination directed to and reflected by the layers of the optical medium to access data stored on a desired layer of the medium. More particularly, alterations in illumination reflected from the desired layer are detected to access data stored on the layer. In accordance with embodiments of the invention utilizing interferometric techniques, the time-of-flight of a reference illumination is adjusted to cause interference of the reference illumination with the illumination reflected from the layer which contains the data to be accessed. Alternatively, and in accordance with embodiments of the invention utilizing non-interferometric techniques, the time-of-flight of illumination reflected by the layer which contains the data to be accessed is selected to permit data stored on the desired layer to be accessed.
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Chinn Stephen R.
Swanson Eric A.
Edun Muhammad N.
Massachusetts Institute of Technology
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