Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1994-08-04
1995-12-26
Epps, Georgia Y.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369100, 3692752, 369288, 430270, 430495, G11B 700
Patent
active
054793920
ABSTRACT:
Information storage system, device and record carriers for improved erasing of information written on a record carrier. A radiation beam is focused on a recording layer of a record carrier containing phase-change material. Crystalline information areas are written on initially amorphous portions of the recording layer by means of the radiation beam having its intensity modulated in accordance with write pulses. The information areas are erased (and changed back into amorphous portions) by means of the radiation beam having its intensity modulated in accordance with erase pulses. The time duration of each of the erase pulses (and, therefore, the intensity of the radiation beam being modulated in accordance therewith to heat the recording layer) and the cooling time of the recording layer thereafter is short enough that areas of the recording layer which are heated during erasing to a temperature above the crystallization temperature of the recording layer but lower than the melting point of the recording layer remain above the crystallization temperature for a period of time which is shorter than the crystallization time for the recording layer. The recording layer may contain a track and have more crystallization nuclei proximate to a centerline of the track than away from the centerline. In addition, the record carrier may be such that its reflection is larger when the recording layer has an amorphous structure than when it has a crystalline structure.
REFERENCES:
patent: 4939717 (1990-07-01), Ohno et al.
patent: 4980879 (1990-12-01), Yamada et al.
patent: 4982396 (1991-01-01), Yasuoka et al.
patent: 5060222 (1991-10-01), Sawano et al.
patent: 5123007 (1992-06-01), Miyauchi et al.
patent: 5268254 (1993-12-01), Ueno et al.
"Optical Memory", by P. Chaudhari and C. D. Zarowin, IBM Technical Disclosure Bulletin, vol. 16, No. 2, Jul. 1973, pp. 568-569.
Coombs James H.
Holtslag Antonius H. M.
Van Es-Spiekman Wilma
Chu Kim-Kwok
Epps Georgia Y.
U.S. Philips Corporation
Weiss Richard A.
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