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US 7,233,554 B2Granted
Disk drive system employing effective disk surface stabilization mechanism
AssigneeRicoh Company, Ltd.
InventorsNobuaki Onagi, Yasutomo Aman, Shozo Murata
Life of this patent
Estimating the term…
Abstract
A stabilization part stabilizes surface vibration of a flexible optical disk along a rotation axis direction of the optical disk by means of pressure difference of air flow created according to Bernoulli's law at a portion on which information writing/reading is performed, provided on a side of the optical disk opposite to a side on which information recording/reproducing is performed. In this case, areas are provide on the upstream side and down stream side along the disk rotation direction of the portion of the optical disk which is stabilized by said stabilization part, said areas of the optical disk not having pressure difference created thereon by the air flow.
Claims39
An optical information reproducing device comprising:
- a driving part driving a flexible optical disk;
- an optical reading part optically reading information from a record surface of the optical disk;
- and
- a stabilization part, stabilizing vibration of the optical disk along the rotation axis direction of the optical disk by means of pressure difference of air flow at a portion on which information reading is performed, provided on a single side of the optical disk opposite to a side on which information reproducing is performed,
- wherein said optical reading part and stabilization part are opposed to one another through the optical disk, and wherein said stabilization part is provided only on said single side of the optical disk, and
- wherein said stabilization part comprises a first portion creating a positive pressure with respect to the atmospheric pressure on the upstream side along disk rotation direction, and a second portion creating a negative pressure with respect to the atmospheric pressure on the downstream side along disk rotation direction.
3 more elements
An optical information reproducing device comprising:
- a driving part driving a flexible optical disk;
- an optical writing part optically reading information from a record surface of the optical disk;
- and
- a stabilization part, stabilizing vibration of the optical disk along the rotation axis direction of the optical disk by means of pressure difference of air flow at a portion on which information reading is performed, provided on a single side of the optical disk opposite to a side on which information reproducing is performed,
- wherein areas are provided on the upstream side and down stream side along the disk rotation direction of the portion of the optical disk which is stabilized by said stabilization part, said areas of the optical disk not having pressure difference created thereon by the air flow, and wherein said stabilization part is provided only on said single side of the optical disk, and
- wherein said stabilization part comprises a first portion creating a positive pressure with respect to the atmospheric pressure on the upstream side along disk rotation direction, and a second portion creating a negative pressure with respect to the atmospheric pressure on the downstream side along disk rotation direction.
3 more elements
An information recording/reproducing device comprising:
- a head mechanism provided on one side of a flexible disk recording medium and performing information recording/reproducing onto the disk recording medium;
- a guide member provided only on the other side of the disk recording medium and controlling positional change such as surface vibration of the disk recording medium;
- a projection amount control mechanism controlling a projection amount of said guide member with respect to the disk recording medium;
- and
- a control part controlling the projection amount of said guide member so that the direct-current offset amount of an object lens becomes minimum in a state in which focus servo control of the object lens for condensing a recording/reproducing beam onto the disk recording medium is locked.
2 more elements
An information recording/reproducing device comprising:
- a head mechanism provided on one side of a flexible disk recording medium and performing information recording/reproducing onto the disk recording medium;
- a guide member provided only on the other side of the disk recording medium and controlling positional change such as surface vibration of the disk recording medium;
- a projection amount control mechanism controlling a projection amount of said guide member with respect to the disk recording medium;
- and
- a control part which, before focus servo control of the object lens for condensing a recording/reproducing beam onto the disk recording medium is made locked, the projection amount of said guide member is changed in rough adjustment of a distance between the object lens and disk recording surface, S-curve of focus error signal is examined so that the projection amount of the guide member is determined.
2 more elements
An information recording/reproducing device comprising:
- a head mechanism provided on one side of a flexible disk recording medium and performing information recording/reproducing onto the disk recording medium;
- a guide member provided only on the other side of the disk recording medium and controlling positional change such as surface vibration of the disk recording medium;
- a projection amount control mechanism controlling a projection amount of said guide member with respect to the disk recording medium;
- and
- a vibration sensor provided on said guide member.
2 more elements
An information recording/reproducing device comprising:
- a head mechanism provided on one side of a flexible disk recording medium and performing information recording/reproducing onto the disk recording medium;
- a guide member provided only on the other side of the disk recording medium and controlling positional change such as surface vibration of the disk recording medium;
- a projection amount control mechanism controlling a projection amount of said guide member with respect to the disk recording medium;
- and
- a vibration sensor provided on a spindle which rotates the disk recording medium.
2 more elements
A method of controlling an optical recording/reproducing device which comprises a driving part driving and rotating a flexible optical disk;
- a pickup performing optical reading/writing onto a recording surface of the optical disk;
- and a stabilization guide member provided on a side of the optical disk opposite to a side of the recording surface, and stabilizing surface vibration of the optical disk at a portion on which writing/reading is performed by means of pressure difference of air flow, comprising the step of:
- controlling tilt angles of the stabilization guide member along a disk radius direction and along a disk rotation tangential direction.
An optical recording/reproducing device comprising:
- a driving part driving and rotating a flexible optical disk;
- a pickup performing optical reading/writing onto a recording surface of the optical disk;
- a stabilization guide member provided on a side of the optical disk opposite to a side of the recording surface, and stabilizing surface vibration of the optical disk at a portion on which writing/reading is performed by means of pressure difference of air flow;
- and
- a tilt adjustment part controlling tilt angles of the stabilization guide member along a disk radius direction and along a disk rotation tangential direction.
2 more elements
A method of controlling an optical recording/reproducing device which comprises a driving part driving and rotating a flexible optical disk;
- and a stabilization guide member provided only on a single side of the optical disk opposite to a side of a recording surface, and stabilizing surface vibration of the optical disk at a portion on which writing/reading is performed by means of pressure difference of air flow, comprising the step of:
- controlling a position of the stabilization guide member along a disk rotation axis direction based on a position of a portion of the optical disk on which writing/reading is performed along disk radius direction and rotation speed of the optical disk, and
- wherein, a surface vibration stabilization state is previously measured in case the position of the stabilization guide member along the disk radius direction and disk rotation speed are changed for particular types of optical disk, and based thereon, a pattern on the adjustment is previously set for the particular types of optical disk, and, the pattern applied is selected according to the type of optical disk applied.
An optical disk drive comprising:
- a driving part driving and rotating a flexible optical disk;
- a stabilization guide member provided only on a single side of the optical disk opposite to a side of a recording surface, and stabilizing surface vibration of the optical disk at a portion on which writing/reading is performed by means of pressure difference of air flow;
- an adjustment control part controlling a position of the stabilization guide member along a disk rotation axis direction based on a position of a portion of the optical disk on which writing/reading is performed along disk radius direction and rotation speed of the optical disk;
- and
- a storage part storing an adjustment pattern obtained from measurement of a surface vibration stabilization state performed in case the position of the stabilization guide member along the disk radius direction and disk rotation speed are changed for particular types of optical disk, and, for each particular type of optical disk, the adjustment control part performing adjustment control operation based on the adjustment pattern read from said storage part.
2 more elements
A method of controlling an optical recording/reproducing device which comprises a driving part driving and rotating a flexible optical disk;
- a pickup performing optical writing/reading onto a recording surface of the optical disk, and a stabilization guide member provided only on a single side of the optical disk opposite to a side of a recording surface, and stabilizing surface vibration of the optical disk at a portion on which writing/reading is performed by means of pressure difference of air flow, comprising the step of:
- adjusting a mutual position along the disk recording surface between the stabilization guide member and pickup along the recording surface of the optical disk according to the rotation speed of the optical disk,
- wherein a relationship between the position of the stabilization guide member and a surface vibration stabilization position along the recording surface of the optical disk in case the rotation speed of the optical disk is changed is previously measured, and, the position of the stabilization guide member along the recording surface of the optical disk is adjusted so that the surface vibration stabilization position on the optical disk moves along a straight line in a radius direction of the optical disk.
An optical recording/reproducing device comprising:
- a driving part driving and rotating a flexible optical disk;
- a pickup performing optical writing/reading onto a recording surface of the optical disk;
- a stabilization guide member provided only on a single side of the optical disk opposite to a side of a recording surface, and stabilizing surface vibration of the optical disk at a portion on which writing/reading is performed by means of pressure difference of air flow;
- an adjustment control part adjusting a mutual position along the disk recording surface between the stabilization guide member and pickup along the recording surface of the optical disk according to the rotation speed of the optical disk;
- and
- a storage part storing a measurement result of a relationship between the position of the stabilization guide member and a surface vibration stabilization position along the recording surface of the optical disk measured in case the rotation speed of the optical disk is changed, said adjustment control part performing, based on the measurement result, the position of the stabilization guide member along the recording surface of the optical disk being adjusted so that the surface vibration stabilization position on the optical disk moves along a straight line in a radius direction of the optical disk.
3 more elements
Dependencies are inferred from the claim text.