Disc drive device operable with different discs that may exhibit different linear velocities or circumferential recording densities
AssigneeSony Corporation
InventorMichihiko Iida
Life of this patent
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Abstract
An optical disc drive device performs a seek operation during a recording and/or reproducing mode on different discs, such as CDs or MDs, individually loaded thereon, which may differ from one another in linear velocity or circumferential recording density. The linear velocity of a disc is calculated as a function of the number of rotations of a disc spin motor and position information of the pickup head. The number of tracks from a current position of the pickup to a target position is determined by using the address of the target position and the linear velocity of the disc.
Claims15
A disc apparatus for performing a seek operation to a target position on one of different disc shaped recording media which may exhibit different linear velocities or circumferential recording densities, one from another, said disc apparatus comprising:
- rotating means for rotating said disc-shaped recording medium;
- servo means for controlling the rotating means to rotationally drive said disc shaped recording medium at a predetermined constant linear velocity;
- head means for reproducing data recorded on a recording track formed on said disc-shaped recording medium;
- moving means for moving said head means radially in relation to said disc-shaped recording medium;
- rotation detection means for detecting a rotation speed of said disc-shaped recording medium;
- position detection means for detecting a current position of said head means;
- velocity calculating means for calculating a linear velocity of said disc-shaped recording medium as a function of said rotation speed and said current position;
- address means for determining a target address corresponding to said target position;
- and
- generating means for generating a number of tracks to said target position on said disc-shaped recording medium from said current position as a function of said current position, said target address and said calculated linear velocity.
A disc apparatus for moving a head means to different positions on a disc-shaped recording medium, wherein said recording medium may exhibit a different linear velocity or circumferential recording density than another of the same type of recording media, the disc apparatus comprising:
- rotating means for rotating said disc-shaped recording medium;
- servo means for controlling the rotating means to rotationally drive said disc-shaped recording medium at a predetermined constant linear velocity;
- head means for reproducing data recorded on a recording track formed on said disc-shaped recording medium;
- moving means for moving said head means radially in relation to said disc-shaped recording medium;
- rotation detection means for detecting a rotation speed of said disc-shaped recording medium;
- position detection means for detecting a current position of said head means;
- velocity calculating means for calculating a linear velocity of said disc-shaped recording medium as a function of said rotation speed and said current position;
- address means for determining an address corresponding to a selected position;
- and
- generating means for generating a number of tracks from a reference position to said selected position as a function of said reference position, said address and said calculated linear velocity.
Dependencies are inferred from the claim text.