Dynamic information storage or retrieval – Storage medium structure – Layered
Patent
1989-07-18
1992-09-01
Shoop, Jr., William M.
Dynamic information storage or retrieval
Storage medium structure
Layered
369288, 3692752, 360135, G11B 726
Patent
active
051446189
ABSTRACT:
An erasable optical disc medium on which information is recorded and read by using a laser beam, which comprises (i) a phase transition type information recording layer, (ii) an optical interference layer and (iii) an optical reflection layer, formed in this order on a transparent substrate, in such a state that a reflectance of the medium is higher before information is recorded and a reflectance of the recorded portions of the medium is lower after recording.
REFERENCES:
patent: 4216501 (1980-08-01), Bell
patent: 4329697 (1982-05-01), Bell
patent: 4782477 (1988-11-01), Ichihara et al.
patent: 4803660 (1989-02-01), Kobayashi et al.
Goto Yasuyuki
Koshino Nagaaki
Nakada Masahiro
Tsugawa Iwao
Utsumi Kenichi
Fujitsu Limited
Martin David
Shoop Jr. William M.
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