| 摘要 |
PURPOSE:To enable to surely read out the address at minimum time, by comparing the addresses of the fields of even number and odd number after reading and performing the reading and comparison when no coincidence of address is obtained, until the maximum reading repetitive number is obtained. CONSTITUTION:The reading of addresses is made immediately after a voltage is fed to the galvano-mirror to be jumped to the adjacent track compulsively, allowing to compare the addresses of the fields of even number and odd number repetitively. If no coincidence of addresses is obtained, the reading and comparison of the addresses are repetitively made as far as the coincidence is not obtained, until the maximum reading repetitive number preset is obtained. If no coincidence of the addresses is further obtained, the addition of + or -1 to the address of preceding track is taken as the address of the track and the processing is moved to the next stage. Thus, the retrieved time can be minimized, allowing to detect the address surely. |
