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

摘要

PROBLEM TO BE SOLVED: To make it possible to increase the track density of a magneto-optical disk and perform stable tracking servo and seeking.

SOLUTION: First grooves GV1, second grooves GV2 and third grooves GV3 are so formed as to be adjacently arranged. The first grooves GV1 and the second grooves GV2 are the deep grooves and the third grooves GV3 are the shallow grooves. The first grooves GV1 and the second grooves GV2 are formed by being wobbled. The grooves are so formed that data is recorded in three tracks by the three grooves or the three lands between the respective grooves. A CTS signal is searched by a sum signal (A+B+C+D) of a photodetector 6 and a push-pull signal is searched by a differential signal (A+D)-(B+C) of a photodetector 8.

COPYRIGHT: (C)2004,JPO&NCIPI