| 摘要 |
In an optical disk apparatus for recording and reproducing data using light beams, the light reflected from a record mark area provided on an optical disk is detected and the amplitude of the signal corresponding to the light is held; the record mark is composed of long pits and long unrecorded areas. This amplitude is compared with that of the signal relative to the light from a data recording area of the optical disk. If the comparison result has a predetermined relation between both signals, an output signal with a prescribed level is produced. This output signal is used to assure the quality of the recorded data.
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