Cheil Synthetics Inc.

Young Jae Heo

Tae Young Nam

Jung Hoon Kim

Jung Hoi Kim

There is provided a WORM type organic optical recording media 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 of a thermosetting or photocuring resin. The organic optical recording medium can be prevented from being rewritten by heating up to 50.degree. C. or irradiating with a UV light, said dye being capable of absorbing near infrared rays and generating heat. The medium exhibits stable reading characteristics of at least 45 dB even after irradiating with a light with a short wavelength. In addition, it also has a function of record locking by curing the resin of the recording layer, so that, once recorded, rewrite or additional recording is not allowed therein. Consequently, it is of high data storage density, high data rates and long data archival capabilities, useful as a medium for recording a variety of information or pictures.

Organic optical recording medium and method for the prevention of

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.

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Seoul, South Korea

Young Jae Heo