| 摘要 |
PURPOSE:To attain the recording/reproduction operation with high efficiency by detecting the defect of a recording film on an optical disk medium by an artificial record mode. CONSTITUTION:A controller 1 confirms the defect detection control of a record ing film of a medium 3 by a test program and sends an artificial record mode signal (8) to an optical disk device 2. The device 2 sends the signal (8) to an input terminal (d) of a level switch circuit 11 via an OR circuit 15 and to an input terminal (e) of a laser power control circuit 13 via an OR circuit 16 respec tively. When the signal (3) or (8) is supplied to the terminal (d), the circuit 11 sends a detection limit level signal (5) equivalent to a detection range (a) to a comparator 14. While a laser power control circuit 13 controls a laser diode 4 to output the output power equivalent to a reproduction mode (2) when the signal (8) is supplied to the terminal (e). Thus a track is traced. The compa rator 14 traces a track with the output power of the mode (2) and compares a detection signal (1) with the check level signal (5) and transmits a tracking fault signal (6) to the controller 1 if a part of the signal (1) following the signal (5) is detected.
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