| 摘要 |
PURPOSE:To improve the S/N of a reproducing signal by deforming recording media in a martensite phase at the room temperature by stress. CONSTITUTION:Recording media 2 and 11 are formed on substrates 1 and 10. The media 2 and 11 show the martensite phase at the room temperature, and are formed by the substance in which a martensite reverse transformation occurs at the special temperature higher than the room temperature and special stress. The information is recorded by heating locally the media 2 and 11. Name ly, the information is recorded so that in the optical beam irradiated from an optical beam generating device 13, the temperature of the optical beam irradiating part can drop below the above-mentioned specified temperature. The symbol 3 in the figure is the recording part. The information recorded in this way is deleted by irradiating the optical beam to the place hard to be deleted by the energy so that the temperature of the media 2 and 11 can be the above-mentioned special one. Thus, in a recording part 3, the deformation disappears and the flat surface is recovered. The information is reproduced by detecting the difference of the reflecting light quantity by a light detecting device 17. |
