| 摘要 |
PURPOSE:To ensure the stable recording of information, by measuring the shift position of a revolving optical disk recording medium and obtaining the shift degree of the recording medium from the result of measurement to give a correction of deflection corresponding to the obtained shift degree. CONSTITUTION:The position of a revolving optical disk recording medium 1 is obtained by a position detector 11 such as a laser interferometer, etc. A position controller 12 calculates both the shift position and the position shift degree of the optical disk 1 and delivers them as a shift control signal. This control signal corrects the shift to the recording of information via a laser beam polarizer 13. Thus the stable recording is possible for information. |
