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US 2002/0110055 A1Published application
Optical disk device
AssigneeFunai Electric Co., Ltd.
InventorTakayuki Ono
Life of this patent
Estimating the term…
Abstract
An optical disk device starts movement of a thread in a track-on state, and releases the track-on state when the thread moves by a certain amount, and gives a driving kick signal to an actuator. The movement of the thread and actuator can be placed in sufficiently good balance so that failure of track jump is prevented, thereby improving the reliability of the device body and suppressing the cost-up of the device body.
Claims4
An optical disk device comprising:
- a thread on which a pick-up head is placed, said pick-up head serving to read data recorded on an optical disk by irradiating a track formed on a recording face of said optical disk with an optical beam focused by a lens and detecting the reflected light;
- a lens moving unit adapted to move the lens of said pick-up head relative to said thread in a radial direction of said optical disk;
- a thread moving unit adapted to move said thread as well as said pick-up head in the radial direction of the optical disk;
- and
- a movement controller adapted to control said thread moving unit to start movement of said thread while controlling said lens moving unit to perform track-on control so that the lens of said pick-up head is located on a prescribed track, and thereafter when it is detected that said lens has deviated from said prescribed track by a prescribed amount or more owing to movement of said thread, starting the movement of said lens by said lens moving unit,
- wherein said movement controller detects whether or not said lens and said prescribed track have displaced from each other by a prescribed amount on the basis of whether a tracking servo signal has exceeded a prescribed potential, until said lens deviates from the prescribed track by a prescribed amount or more, controlling said thread moving unit to apply force having a prescribed magnitude to said thread continuously and when shifted by the prescribed amount or more, controlling said thread moving unit and said lens moving unit to control the moving speed of the lens at a constant speed.
3 more elements
An optical disk device comprising:
- a thread on which a pick-up head is placed, said pick-up head serving to read data recorded on an optical disk by irradiating a track formed on a recording face of said optical disk with an optical beam focused by a lens and detecting the reflected light;
- a lens moving unit adapted to move the lens of said pick-up head relative to said thread in a radial direction of said optical disk;
- a thread moving unit adapted to move said thread as well as said pick-up head in the radial direction of the optical disk;
- and
- a movement controller adapted to control said thread moving unit to start movement of said thread and thereafter when it is detected that said lens has deviated from said prescribed track by a prescribed amount or more owing to movement of said thread, starting the movement of said lens by said lens moving unit.
2 more elements
Dependencies are inferred from the claim text.