| 摘要 |
PCT No. PCT/JP85/00488 Sec. 371 Date Apr. 30, 1986 Sec. 102(e) Date Apr. 30, 1986 PCT Filed Sep. 2, 1985 PCT Pub. No. WO86/01630 PCT Pub. Date Mar. 13, 1986.A disk-type recording medium having circular or spiral tracks storing information. The tracks are radially and regularly spaced from one another. Each track has pregrooves (2), ridges, or protrusions, and discrete depressions (7,9), ridges, or protrusions. The depressions (7,9) are so disposed that the depressions of neighboring tracks do not neighbor one another. In playback, the depressions (7,9) of neighboring tracks do not cause crosstalk. Thus, the disk permits the identifying signals to be stably and correctly reproduced.
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