OPTICAL RECORDING MEDIUM, MASTER DISK FOR MANUFACTURING OPTICAL RECORDING MEDIUM, RECORDING AND REPRODUCING DEVICE, AND RECORDING AND REPRODUCING METHOD

摘要

PROBLEM TO BE SOLVED: To obtain a CTS signal in such an amount of signal that can be used for a seak operation and a tracking servo even if the ratio of groove width to a track pitch is about 50%.

SOLUTION: Deep grooves 6a and 6b having 50 to 58% ratio of the groove width / the track pitch and shallow grooves 7a and 7b formed at the nearly center of a land and having a V-shaped section are formed on a magneto-optical disk so as to be adjacently disposed. The deep grooves 6a and 6b are wobbled and data are recorded in only the deep grooves. The shallow grooves 7a and 7b are formed in the nearly center position of the land so as not to be wobbled. The CTS signal is obtained by a sum signal (A+B+C+D) of a photo detector 8. The CTS signal has a satisfactory amplitude. A push-pull signal is obtained by a difference signal (A+D)-(B+C) of photo detector 8.

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