| 摘要 |
A read-write optical disk with a method of manufacture and configuration ofwriting 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 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.
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