| 摘要 |
PURPOSE:To obtain an information recording tape which permits rewriting by using a metal or alloy having at least two kinds of phases in a solid phase state and utilizing the change of the crystal structure arising from the transformation of said phases. CONSTITUTION:The recording medium consists of the metal or alloy which has at lest two kinds of the crystal structure in the solid state, maintains the crystal structure of one temp. region in the other temp. region and/or induces the volumetric changes different from each other in the crystal state. For example, a large difference in the spectral reflectivity of a reddish copper color and golden color is observed at about 500nm when the tape-shaped recording medium deposited by evaporation with a 14wt% Al-4wt% Ni-Cu alloy is subjected to heating and quick cooling and to heating and slow cooling. The information processing is therefore possible at this wavelength. The recording, reproduction and erasure of information are executed by the laser spot stopped down to 1.0 micron to several microns by an objective lens. The difference between recording and erasure is obtd. by varying the intensity of laser power. |
