Method of setting power for a reproducing beam to be applied to a magneto-optical disc, and method of reproducing data from a magneto-optical disc
Patent 6552980 Issued on April 22, 2003. Estimated Expiration Date: 
June 28, 2021. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 28, 2021. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 5548572 Device for controlling the power of a recording optical beam in an information storage apparatus Patent #: 6246660 InventorAssigneeApplicationNo. 893927 filed on 06/28/2001US Classes:369/47.5, Power control for energy producing device369/47.1, CONTROL OF STORAGE OR RETRIEVAL OPERATION BY A CONTROL SIGNAL TO BE RECORDED OR REPRODUCED369/53.1CONDITION INDICATING, MONITORING, OR TESTINGExaminersPrimary: Edun, MuhammadAttorney, Agent or FirmInternational ClassG11B 007/00Foreign Application Priority Data2000-06-29 JPAbstractAn object of the invention is to provide a method of setting power for a reproducing beam applied to a rotating magneto-optical disc to reproduce data signals therefrom in the magnetically induced super resolution (MSR) mode, thereby to heat the signal-recording layer of the disc sufficiently even if the disc warps and to attain an adequate MSR effect. Another object of the invention is to provide a method of reproducing data from such a magneto-optical disc. To set power for the reproducing laser beam, calibration is carried out for at least two points on the radius of the magneto-optical disc, and optimal powers for these points are calculated. From the optimal powers, the power for the reproducing beam is calculated by curvilinear approximation and set for a given position on the magneto-optical disc. The margin of power for the reproducing beam can be thereby increased. Data can therefore be reliably reproduced in the MSR mode from the magneto-optical disc that has a signal-recording layer whose magnetic characteristic greatly depends on temperature.Field of SearchCONTROL OF STORAGE OR RETRIEVAL OPERATION BY A CONTROL SIGNAL TO BE RECORDED OR REPRODUCEDControl of transducer assembly mechanism Power control for energy producing device For storage During multiple system modes Stored and retrieved testing signal CONDITION INDICATING, MONITORING, OR TESTING Including radiation storage or retrieval BINARY PULSE TRAIN INFORMATION SIGNAL Binary signal processing for controlling recording light characteristic Light intensity adjustment or maintenance | |
