| 摘要 |
AN OPTICAL DISK APPARATUS COMPRISING AN OPTICAL DISK (10) ON WHICH PITS (1,31) CORRESPONDING TO DATA BITS ARE ARRANGED IN A TRACK TANGENTIAL DIRECTION, A MOTOR DRIVE UNIT (11,12) FOR ROTATING THE OPTICAL DISK (10), AND A REPRODUCING UNIT (13) FOR REPRODUCING THE PITS, WHEREIN THE LENGTH PL OF EACH OF THE PITS IS SET AT SUCH A VALUE AS TO SATISFY A CONDITION OF FOLLOWING EQUATION 0.55 (FT PL) / (N SR1) 1.50 WHERE THE SCANNING LINEAR VELOCITY AT WHICH THE DISK (10) IS ROTATED BY THE MOTOR DRIVE UNIT (11,12) WHEN THE REPRODUCING UNIT (13) REPRODUCES THE PITS RECORDED IN A RADIUS R1 OF THE DISK IS SET TO SRL [M/S], A PRESET CHANNEL BIT RATE IN THE RADIUS R1 OF THE OPTICAL DISK IS SET TO FT [B/S], THE PITS CORRESPOND TO DATA RECORDED IN CORRESPONDENCE TO THE N-CHANNEL BIT LENGTH, AND THE PIT LENGTH IN THE TRACK TANGENTIAL DIRECTION IS SET TO PL [M].
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