发明授权
- 专利标题: Reversible optical information-recording medium
- 专利标题(中): 可逆光信息记录介质
-
申请号: US08053343申请日: 1993-04-28
-
公开(公告)号: US06268107B1公开(公告)日: 2001-07-31
- 发明人: Noboru Yamada , Kunio Kimura , Masatoshi Takao , Susumu Sanai
- 申请人: Noboru Yamada , Kunio Kimura , Masatoshi Takao , Susumu Sanai
- 优先权: JP60-211470 19850925; JP60-211471 19850925; JP61-53033 19860311; JP61-53034 19860311
- 主分类号: G11B1103
- IPC分类号: G11B1103
摘要:
Phase-change type, reversible optical information recording medium, being possible for recording, reproducing, erasing, and rewriting of information, by use of a laser beam. This invention, consists of recording thin film of ternary elements, for example, containing Ge, Te, Sb/or Bi or quaternary elements containing the fourth element of Se with which a part of Te is replaced, which is established on such surface—flat substrates as glass or plastics. In this case, the component ratio of Te and Se is selected not to be excess for other elements, such as Ge, Sb/or Bi so as to be fixed as stable compounds of stoichiometric compositions of GeTe, Sb2Te3/or Bi2Te3, or GeSe, Sb2Se3/Bi2Se3 when crystallized. Strictly speaking, a concentration of each component is selected to have proper ratio of the number of atoms each other so as to represent whole composition as the sum of each component. By this treatment, it is possible to have high crystallization speed and long cyclability of recording/erasing. The effect of Se is to increase the viscosity of the system and to make easily to obtain amorphous state; and moreover, by selecting of proper amount diplaced with Te, it is possible to obtain the composition of recoding film superior in both characteristics of recording (amorphization) and erasing (crystallization).