Saliwanchik & Saliwanchik
Organic optical recording medium and method for the prevention of rewrite therein
 There is provided a WORM type organic optical recording medium comprising a recording layer, a reflective layer and a protective layer which are formed in sequence on a substrate, the recording layer consisting of near infrared absorbing dye able to absorb a laser beam and to generate heat and provided with a curing layer of thermosetting or photocuring resin thereon or thereunder. There is also provided a method for the prevention of rewrite in the organic optical recording medium, comprising subjecting the organic optical recording medium to heating up to 50.degree. C. or exposure to a UV light, to cure the curing layer. The organic optical recording medium requires reduced amounts of the dye and, thus, has improved reflectivity. By virtue of this improvement in reflectivity, a low-price metal may be employed in the reflective layer, bringing about additional economic benefit, along with lower requirements for dye. Inscription of recording signals in the resin of the curing layer by the dye eliminates the anxiety that recording information may be damaged by spontaneous discoloration of the dye. Crosslinking the curing layer results in improved durability as well as prevention of rewrite. Consequently, this medium has long data archival capabilities and is useful as a medium for recording a variety of information or pictures. 
Cheil Synthetics Inc.
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Young J. Jung H. Tae Y.
Heo Kim Nam