WRITING PHRASE CONTINUITY ACCURACY INSPECTION INSTRUMENT IN CLOCK SIGNAL WRITING DEVICE TO DISK TYPE RECORDING MEDIUM

摘要

PURPOSE:To attain the highly accurate writing of servo information by comparing the phase differences of a reading waveform and an electric clock pulse in two positions in the vicinity of a gap in the reading waveform and deciding the writing and linking accuracy of a reference clock signal in the vicinity of the gap. CONSTITUTION:When there is a shift in the phase of the reading waveform in the vicinity of the gap, the shift of the scale according to the shift between the phase difference and the reading waveform and the clock pulse in the position immediately before the gap and the phase difference between the reading waveform and the clock pulse in the position immediately after the gap is produced. Accordingly, said phase differences are respectively detected in the positions in the vicinity of the gap by a detecting means 12 and the two phase differences are compared by comparison means 23, 24, thereby, whether the accuracy in the writing and linking part is deteriorated or not is understood according to a constant scale in the dimension of the shift of the two phase differences.