| 摘要 |
PURPOSE:To realize high-speed access, and also to prevent an intermittent noise from being mixed, by incorporating auxiliary information for reproducing the information into a continuous track like a concentric circle or a spiral. CONSTITUTION:A signal of a waveform is formed on the edge part of a track groove 13 and also a signal element 14 is formed by exposing a resist applied on a glass original disk by a continuous optical beam, and executing a modulation of stress to the optical beam by a signal containing an address signal. An auxiliary signal of the waveform is a phase pattern, and when a recording and reproducing signal is formed by a variable density pattern, the reproducing signal becomes the sum of them, and the S/N ratio is improved. The auxiliary signal and the address signal are not cut off at all, therefore, high-speed access can be realized, and also an intermittent noise is prevented. |
