Rewritable photochromic optical disk

Details Rewritable photochromic optical disk Rewritable photochromic optical disk

1992-06-02

1993-10-12

Ryan, Patrick J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428457, 428913, 430945, 346 76L135.1, 369288, B32B 300

Patent

active

052523713

ABSTRACT:
A rewritable photochromic optical disk comprises a photochromic recording layer made of a dibenzothienyl ethene derivative, 1,2-di(2-cyano-3-benzothienyl)-1,2-dicyanoethene capable of assuming first and second states, the first state with a first absorption band transforming into the second state with a second absorption band by irradiating a first light beam of a first wavelength, and the second state transforming into the first state by irradiating a second light beam of a second wavelength in the second absorption band. This rewritable photochromic optical disk has a stability in the repeated recording and erasing information and a high thermal stability and capable of storage of information extended over a long period of time, in accordance with its higher quantum yield than that of the conventional dibenzothienyl ethene derivative so that the achromatic reaction takes place by irradiation of a low power laser beam.

REFERENCES:
patent: 4837063 (1989-06-01), Irie
patent: 5061582 (1991-10-01), Brettle et al.

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