| 摘要 |
PURPOSE:To permit reading out of data pits of a reproduction part and the data clock corresponding thereto at all times during reproduction by forming guide track of a guide pit array corresponding to the data clock. CONSTITUTION:The guide track of an optical information recording disk preformatted with the concentrical or spiral guide tracks around the center of rotation are formed of the guide pit array 1 corresponding to the data clock. A laser spot is made to track by the guide pit array 1 corresponding to the data clock. The data pits 4 or the data clock corresponding to the inverted magnetic domain can, therefore, be read out at all times during the reproduction. The after-writing of the fresh data to the unrecorded region by the read-out data clock is thereby permitted and the simplification and miniaturization of a VFO circuit are permitted even with a disk driving device of a CLV or MCAV system. |
