OPTICAL DISK DEVICE

摘要: PURPOSE:To supplement the uncertainty of moving operation an optical beam due to omitting detection and erroneous movement starting information, by providing a specific signal in addition which reads prepares beam. CONSTITUTION:When external mark detector 8 detects 7, gate counter circuit 9 starts counting operation. An head 3 reproduced signals while (2) is outputted and, when detecting 5 information a''-c'' instructing start beam, AND conditions 10 coincide with each other prescribed pulse (4) outputted. When cannot be detected, condition that output detected another 14 from latching 11. Then, through calculation 14, (2)' fall 13 control 6 OR 15 as supplementary (5)' shifted one track means 6.