Method for erasably recording data by viscoelastic shear deforma

Details Method for erasably recording data by viscoelastic shear deforma Method for erasably recording data by viscoelastic shear deforma

1986-10-02

1988-10-25

Faber, Alan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369284, 369286, 346 76L, 346 77E, 3461351, 365126, G11B 726

Patent

active

047808675

ABSTRACT:
An erasable optical data storage medium has a polymer dual recording layer including an expansion layer bonded to a retention layer, each of the layers dyed to selectively absorb light in respective narrow wavelength bands. The retention layer has a glass transition temperature substantially above the glass transition temperature of the expansion layer, and is capable of undergoing substantial viscoelastic shear deformation while below its glass transition temperature. A first laser beam heats the expansion layer causing it to expand and cause viscoelastic deformation in the retention layer while the retention layer is below its glass transition temperature. A second laser beam is used to heat the retention layer above its glass transition temperature and relax the deformation, erasing the medium.

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