| 摘要 |
PURPOSE:To generate no loss of information even if a disk base material is heterogeneous optically by reducing laser light from the side of a protective resin plate, and executing recording and reproducing, when executing the recording and reproducing of an optical disk. CONSTITUTION:Recording media 2 and 2a of a tellurium alloy are adhered tightly by means of vapor deposition, etc. to a groove surface of a grooved resin-made disk substrate 7 obtained by compression or injection molding. Thereafter, recording media 3 and 3a are provided, transparent protective resin plates 11 and 11a are superposed on said mediums and stuck, by which an optical disk is formed. Laser light 5 condensed by a condenser lens 6 is condensed and converged as indicated with an arrow, passes through an air layer 4 from the protective resin plate 11, reaches the surface of the recording medium 2, is reflected partially, reaches a photodetector 9 through the same optical path, is converted to an electric signal, and outputted as an electric signal 10. According to such constitution, an error rate can be reduced by about one figure. |
