| 摘要 |
PURPOSE:To obtain an optical disk medium having recording performance of high resolving power without pollution by using a thin amorphous silicon germanium (a-SiGe) film layer on an optical recording medium layer and executing recording by crystallizing the thin a-SiGe film layer. CONSTITUTION:The optical disk of this invention is provided with the optical recording medium layer provided on a substrate provided with guide grooves and said medium layer is the thin a-SiGe film layer. The recording with this medium is executed by crystallizing part of the thin a-SiGe film layer. The thin a-SiGe film layer of the recording layer is non-polluting unike the conventional Te alloy; therefore, the satisfactory safety of operators and users during production and use is assured. In addition, there is no possibility of environmental pollution, etc., when the medium is discharged. The reliability is higher as the recording is executed by crystallizing the thin a-SiGe film layer. |
