JPS5512561A - Disc player - Google Patents

Abstract

PURPOSE:To enable to correct the eccentricity of disc automatically while revolution, by driving the disc correction set with the tracking information from the track position detection means and the phase information from the disc rotation phase detection means, at disc reproduction. CONSTITUTION:When the disc 1 is turned, the tracking error signal from the track position detector 8 of the pick up unit 6 is reproduced. On the other hand, the pulse signal one by one disc revolution is reproduced from the rotary phase detector 22 simultaneously. The signal corresponding to the eccentricity is separated from the tracking error signal at the filter circuit 20 as the correction signal and it is fed to the sample hold circuit 11. The pulse signal from the said rotary phase detector 22 is fed to the sample hold circuit 11 and the disc rotation control circuit 21. The hold circuit 11 sample-holds the correction signal in the timing of pulse from the detector 22 and it is fed to the eccentricity correction set drive circuit 10. Four sets of disc eccentricity correction sets 5 are driven with the output of the drive circuit 10 to automatically correct the eccentricity.