| 摘要 |
AN OPTICAL PICKUP (2) APPLIES FIVE DIFFERENT LIGHT BEAMS AT THE SAME TIME TO EVERY SECOND FIVE TRACKS ON A SIGNAL PLANE OF A CD-ROM (1). A RECORD DATA READ SYSTEM (20) READS RECORD DATA INDEPENDENTLY FOR EACH LOGHT BEAM SYSTEM IN ACCOEDANCE WITH OUTPUTS OF RESPECTIVE LIGHT BEAMS REFLECTED FROM THE SIGNAL PLANE, AND STORES THE READ RECORD DATA IN RECORD ORDER. UNDER THE CONTROL OF A SYSTEM CONTROLLER, THE OPTICAL PICKUP (2) AND RECORD DATA READ SYSTEM (20) READ THE RECORD DATA OF CD-ROM (1) BY ALTERNATELY PERFORMING AN OPERATION OF CONTINUOUSLY READING THE RECORD DATA WITH THE FIVE LIGHT BEAM SYSTEMS (3) DURING APPROXIMATELY TWO ROTATIONS OF CD-ROM (1) AND A TRACK JUMP OPERATION BY SEVEN TRACKS IN A FORWARD DIRECTION AFTER THE CONTINUOUS READING OPERATION WITH A COMBINATION OF THE FIVE LIGHT BEAM SYSTEMS (3) SHOWS NO OMISSION OF THE RECORD DATA OF CD-ROM (1).(FIG 1)
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