Read-write optical disk

Details Read-write optical disk Read-write optical disk

1987-07-01

1989-06-20

Gonzalez, Frank

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369275, 369288, G11B 724

Patent

active

048415154

ABSTRACT:
A read-write optical disk with method of manufacture and configuration of writing mechanism. The optical disk is fully configured at every readable location with pits filled with a stable, cyclable, solid-liquid (or solid-fluid) phase-change material, such as a paraffin mineral oil fraction, having a specific reflectivity when in the solid state, and a layer of a particulate metallic material capable of being magnetically attracted or repelled and having a reflective value significantly different from that of the phase-change material. The writing mechanism includes laser light amplification means to provide sufficient heat from the laser, which is used in the reading mode, to effect the solid-liquid phase change. The writing mechanism further includes a material-moving magnetic element. During operation of the write cycle, the phase-change material, in selected pits, is fluidized and is in the fluid state while a magnetic field is applied to the pit area. As a result, the layer of particulate metallic material is magnetically moved through the fluidized phase-change material, either into or out of exposure to the laser used in the reading mode, thereby providing a significant change of reflectivity of the exposed surface of the individual pits.

REFERENCES:
patent: 4611317 (1986-09-01), Takeuchi et al.

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