Information recording method and apparatus for determining whether recording has been correctly performed
Patent 5485433 Issued on January 16, 1996. Estimated Expiration Date: 
January 16, 2013. 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.
January 16, 2013. 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 ReferencesPulsed optical data detection system Magneto-optic memory apparatus with defect detection of recording medium during erasing operation Magneto-optical signal reproducing apparatus in which reproduced magneto-optical signal level is compared with reference signal level varied in accordance with in-phase signal Patent #: 5189650 InventorsAssigneeApplicationNo. 991447 filed on 12/16/1992US Classes:369/13.02, Magnetic field and light beam369/53.36During storageExaminersPrimary: Neyzari, AliAttorney, Agent or FirmForeign Patent References
International ClassG11B 011/00Foreign Application Priority Data1991-12-19 JPAbstractA method of recording new information on a recording medium on which information was previously recorded is performed as follows. The new information is stored in a memory. The new information is overwritten onto a portion of the recording medium where the old information was recorded by scanning the recording medium with a light beam. A signal including both the old information and the new information is reproduced from the light beam reflected by the recording medium simultaneously with the overwriting. A signal component corresponding to the new information is extracted from the reproduced signal. The extracted signal component is compared with the new information stored in the memory. It is determined on the basis of a comparison result whether or not the recording has been correctly performed.Field of SearchSIMULTANEOUS DIVERSE TYPES OF STORAGE OR RETRIEVALRadiation beam modification of or by storage medium Erasable, reversible or re-recordable Layered (e.g., permanent protective layer) With particular light source (e.g., laser, CRT with phosphor) Thermomagnetic recording or transducers Magneto-optical | |
