Patent
Optical disk apparatus and data read-out control method
| العنوان: | Optical disk apparatus and data read-out control method |
|---|---|
| Patent Number: | 7,715,288 |
| تاريخ النشر: | May 11, 2010 |
| Appl. No: | 11/850372 |
| Application Filed: | September 05, 2007 |
| مستخلص: | An optical disk apparatus includes an optical pickup head (PUH) which outputs a laser beam through an objective lens. When a control unit receives an instruction to halt data read-out from an optical disk, the control unit moves the PUH to a predetermined position, stores a focus driving voltage corresponding to a position of the objective lens in a memory unit, and halts the output of the laser beam from the PUH. When the control unit receives an instruction to resume the data read-out, the control unit resumes the output of the laser beam from the PUH, starts a focus search on the basis of the focus driving voltage that is stored in the memory unit, moves the objective lens in a direction toward the optical disk, and achieves focus adjustment. |
| Inventors: | Nakane, Hiroshi (Fukaya, JP) |
| Assignees: | Toshiba Samsung Storage Technology Corporation (Kawasaki, JP) |
| Claim: | 1. An optical disk apparatus which radiates a laser beam on an optical disk and reads out data from the optical disk, comprising: an optical pickup head which outputs the laser beam through an objective lens; a laser control unit which controls the laser beam which is radiated from the optical pickup head; a focus adjustment unit which moves the objective lens in a direction toward the optical disk with a control of a focus driving voltage, thereby adjusting focusing; a memory unit which stores the focus driving voltage; a movement unit which moves the optical pickup head in a radial direction of the optical disk; a rotation unit which rotates the optical disk; and a control unit which moves, when an instruction to halt data read-out from the optical disk is received from an external apparatus, the optical pickup head to a predetermined position, stores the focus driving voltage corresponding to a position of the objective lens in the memory unit, and controls the laser control unit to halt the radiation of the laser beam from the optical pickup head, and which controls, when an instruction to resume the data read-out is received from the external apparatus, the laser control unit to resume the radiation of the laser beam from the optical pickup head, and sets the focus driving voltage of the focus adjustment unit on the basis of the focus driving voltage that is stored in the memory unit, wherein the focus adjustment unit starts a focus search by using the focus driving voltage, moves the objective lens in the direction toward the optical disk, and achieves focus adjustment. |
| Claim: | 2. The optical disk apparatus according to claim 1 , wherein when the control unit receives the instruction to halt the data read-out, the control unit controls the rotation unit to rotate the optical disk at a high speed by a constant angular velocity (CAV) method. |
| Claim: | 3. The optical disk apparatus according to claim 1 , wherein when the control unit receives the instruction to halt the data read-out, the control unit controls the movement unit to move the optical pickup head to an innermost peripheral position of the optical disk, and stores the focus driving voltage, which corresponds to the innermost peripheral position, in the memory unit. |
| Claim: | 4. The optical disk apparatus according to claim 1 , wherein when the focus adjustment unit moves the objective lens with the focus driving voltage stored in the memory unit, the focus adjustment unit controls the focus driving voltage such that a movement speed of the objective lens becomes lower than a normal movement speed. |
| Claim: | 5. The optical disk apparatus according to claim 1 , wherein the memory unit stores focus driving voltage values which correspond to a plurality of rotational positions of the optical disk that is rotated by the rotation unit and which vary in accordance with surface wobbling of the optical disk, and the focus adjustment unit corrects the focus driving voltage for moving the objective lens, on the basis of the focus driving voltage value corresponding to each of the rotational positions stored in the memory unit. |
| Claim: | 6. A data read-out control method comprising: radiating a laser beam on an optical disk through an objective lens of an optical pickup head and reading out data from the optical disk when an instruction to read out data from the optical disk is received; moving, when an instruction to halt the data read-out from the optical disk is received, the optical pickup head to a predetermined position, and storing a focus driving voltage corresponding to a position of the objective lens in a memory unit; halting the radiation of the laser beam from the optical pickup head after the focus driving voltage is stored; resuming, when an instruction to resume the data read-out from the optical disk is received, the radiation of the laser beam from the optical pickup head; setting the focus driving voltage of the focus adjustment unit on the basis of the focus driving voltage that is stored in the memory unit; and starting a focus search by using the focus driving voltage that is set, moving the objective lens in a direction toward the optical disk, and achieving focus adjustment. |
| Claim: | 7. The data read-out control method according to claim 6 , wherein when the instruction to halt the data read-out is received, the optical disk is rotated at a high speed by a constant angular velocity (CAV) method. |
| Claim: | 8. The data read-out control method according to claim 6 , wherein when the instruction to halt the data read-out is received, the optical pickup head is moved to an innermost peripheral position of the optical disk, and the focus driving voltage, which corresponds to the innermost peripheral position, is stored in the memory unit. |
| Claim: | 9. The data read-out control method according to claim 6 , wherein when the objective lens is moved with the focus driving voltage stored in the memory unit, a movement speed of the objective lens is set to be lower than a normal movement speed. |
| Current U.S. Class: | 369/4/425 |
| Patent References Cited: | 6246646 June 2001 Abe et al. 7548495 June 2009 Kobayashi 11-232656 August 1999 11-296990 October 1999 11-312357 November 1999 2008-21356 January 2008 |
| Primary Examiner: | Edun, Muhammad N. |
| Attorney, Agent or Firm: | Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P. |
| رقم الانضمام: | edspgr.07715288 |
| قاعدة البيانات: | USPTO Patent Grants |
| الوصف غير متاح. |