| 摘要 |
PURPOSE:To improve the signal-to-noise ratio by mixing a substance which is not involved directly in the change of the state from an amorphous to a crystalline state almost uniformly into the titled recording material. CONSTITUTION:A recording material is obtained by mixing 5-30mol% >=1 kind of substance (e.g., SiC) which is not involved in the change of the state from an amorphous to a crystalline state is mixed almost uniformly into the recording material (e.g., TeOx (x 1)) which produces the change of the state from an amorphous to a crystalline state by the impression of an electromagnetic wave, an electric field, and an electric current and heating. The inside of the parts Z, Z, etc. whose state is changed into a crystalline state in correspondence with an information signal is separated into extremely many plural fine parts. Each fine part of the plural fine parts has a polarization characteristic which differs at random from each other, and many fine parts whose polarization characteristics differ at random from one another are contained in the cross section of the spot P of a laser beam for reading the information signal used in reproduction. |
