| 摘要 |
PURPOSE:To erase recording information by heating and annealing by an information recording method wherein a heat above an isotropic phase transition temperature is pulsatively applied on a recording medium having a polymeric liquid crystal material through a thermal recording means and, thereafter, the medium is quenched. CONSTITUTION:A pulse current from an information source is applied to a resistor 8 of a recording head 6 which is relatively running in contact with a recording medium 1, whereby the polymeric liquid crystal of a recording layer 4 is momentarily heated above a clearing point. The phase of the recording layer turns from a liquid crystal glass phase to an isotropic phase through a liquid crystal phase. After being quenched by turning OFF the current, it transits from the isotropic phase to an isotropic amorphous phase through an unstable isotropic phase. Then, a recording material is made transparent and identifiable with a high-reflective aluminum vapor-deposited film 3 exposed. The recording layer 4 is heated by a resistor 9 of an erasing head 7 and annealed, thereby returning to an opaque liquid crystal glass phase and erasing the recording thereon. |
