| 摘要 |
PURPOSE:To eliminate an interference among tracks, by extracting the tracking error signal by scanning a track already recorded and fetching and recording the error signal and then carrying out a tracking control based on the recorded signal when the recording is carried out to a new track. CONSTITUTION:The signals obtained at a pickup 5 by scanning the track already recorded are successively stored in a voltage memory capacitor 24 in the form of the tracking error signals via an amplifier 13, an FM wave detector 14, a BPF15, an SH circuit and an amplifier 17 respectively. An analog gate FET23 is opened and closed by an oscillator 25 and a ring counter 26 with a 1/32 cycle of the disk rotation for example and synchronously with the rotation of a disk 4 via a rotation sensor 8. The tracking error signal thus stored is read again during the recording synchronously with the rotation of the disk 4, and thus drives the driving device of a lens 3. |
