OPTICAL DISK UNIT.

摘要

An optical disk unit capable of executing a stable tracking control even of an optical disk on which signals can be recorded on both the recessed and extruded parts of the track. Offset judging means (55) senses whether or not the signals are recorded in only one area of the two neighboring recording areas aligned in the direction perpendicular to the track direction. Based upon the control signals (L3) output in accordance with the judgment, an offset voltage superposing circuit (56) superposes an offset voltage on an error signal (E1). Thus, the offset of the tracking error signals generated due to the fact that pits where signals are recorded exist only on inner or outer track of the adjacent recording tracks is canceled. In this way, stable tracking control is possible. Also, in an address management memory (51) the addresses of the area on which signals are recorded are stored. Therefore, it is possible to detect with a simple structure that signals are recorded on only one of the two adjacent recording areas.