Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1997-10-20
1999-05-18
Swann, Tod R.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 4437, 369 94, G11B7/12
Patent
active
059057084
ABSTRACT:
A device for reading from or writing to an optical recording medium is disclosed which has at least two information carrier layers spaced apart from one another, as well as a light source, an optical unit and a detection unit. The device permits a plurality of information carrier layers to be read from and/or written to simultaneously using light of a single wavelength. A partial beam generating element emits two polarized beams which differ in terms of polarization direction and propagation behaviour.
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Chu Kim-Kwok
Deutsche Thomson-Brandt GmbH
Herrmann Eric P.
Kurdyla Ronald H.
Swann Tod R.
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