Erasable optical data storage medium having a zoned integral rec

Details Erasable optical data storage medium having a zoned integral rec Erasable optical data storage medium having a zoned integral rec

1986-10-08

1990-02-13

Stephan, Steven L.

Dynamic information storage or retrieval

Storage medium structure

Layered

3461351, 369275, 430 19, 430270, 430495, 430945, G11B 724

Patent

active

049013041

ABSTRACT:
An erasable optical data storage medium has an integral recording layer including an expansion zone and a retention zone having different optical and thermal-mechanical properties. A uniform integral layer of dyed polymer material has the dye leached out of the surface region and a second dye diffused into the surface region to create a retention zone. The retention zone has a higher elastic modulus and glass transition temperature than the underlying expansion zone and is adapted to absorb and transmit light which is centered about a different wavelength than the expansion zone. The medium is adapted to be used with a non-ablative and non-vesicular method to create and erase optically detectable deformations in the retention zone.

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