| 摘要 |
PURPOSE:To facilitate the selection of either a constant angle or constant line driving by dividing a track provided at the disc-shaped optical disk into plural ones with a radial sector, providing control information for driving a constant angle, control information for driving a constant line and a succeeding information recording part from a peak in respective sectors and accessing either of two types of control signals. CONSTITUTION:By sandwiching grooves on the surface of a disc-shaped optical disk 1 a hill-shaped spiral or concentric track is formed, this is divided spirally and made into a continuous sector part 122. Next, in the sequence from the peak of respective sectors 122, a first bit part 110 to record the control information for driving a constant angle, a second bit part 111 to record the constant line driving information, a virtual bit part 112 an information recording part 121 are provided. Thus, the disk 1 is constituted, either a bit part 110 or 111 is selected with two types of the control signals and based on the result, a succeeding recording part 121 is accessed. |
