1993Sony CorporationOptical recording/reproducing apparatus including means for synchronizing the phase of a data read clock signal with data recorded on an optical recording mediumUS5237554 *Dec 19, 1990Aug 17, 1993Sony CorporationApparatus for generating clock signals for data reproductionUS5255261 *Jun 21, 1990Oct 19, 1993Hitachi Maxell, Ltd.Information recording diskUS5278814 *Apr 12, 1990Jan