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| Number | Title | Issue Date |
| 8000177 | Reading device and reading method for an optical data recording medium A reading devices suppresses deterioration of the recording marks caused by increasing the output laser power to compensate for a drop in the S/N ratio when reading at a high speed information recorded to a high density recording medium. To read information recorded... | 08/16/2011 |
| 8000176 | Estimation of maximum available write power of an optical storage drive A method for estimating maximum available write power of an optical storage drive includes generating a beam of laser light having a power level, measuring a first parameter of the laser light source and a second parameter of the beam of laser light, and using the m... | 08/16/2011 |
| 7693010 | Optical beam control device and image-forming device including the same An optical beam control device that can suppress deterioration of a laser diode and a photosensitive member is disclosed. Control is performed in such a manner that the luminous energy of emitted light is increased gradually in an initial period from the activation ... | 04/06/2010 |
| 7656753 | Optical recording, producing apparatus, and method with peak-hold voltage features The present invention proposes a method of controlling the laser power of a semiconductor laser that, in this method of controlling the laser power of a semiconductor laser by applying a power source voltage to between the collector and emitter of an output transist... | 02/02/2010 |
| 7602675 | Optical recording method Provided is an optical recording method for recoding information on a phase-change optical recording medium at a low linear velocity by use of a divided pulse method. When forming a plurality of recording marks by use of a constant divided pulse number m, a light ir... | 10/13/2009 |
| 7420887 | Optical storage apparatus, method for regeneration from optical storage medium, and method for recording on optical storage medium If regeneration is not performed normally when data is regenerated from a medium, a read retry processing unit changes the intensities of the laser beam and of the regeneration magnetic field respectively to prearranged stages to perform the regeneration again. A re... | 09/02/2008 |
| 7408729 | Enhanced data storage and retrieval devices and systems and methods for utilizing same The present invention relates generally to the storage and/or retrieval of information on magnetic storage media by using one or more novel approaches alone or in combination. These novel approaches are capable of using at least one code which may comprise more than... | 08/05/2008 |
| 7352660 | Enhanced data storage and retrieval devices and systems and methods for utilizing the same The invention relates generally to store information on magnetic or optical storage media by using one or more novel approaches alone or in combination. These novel approaches are capable of using at least one code which may comprise more than two values (FIG. 4 | 04/01/2008 |
| 7352659 | Method and apparatus for phase and/or copy window control use with a domain expansion recording medium and record carrier A method and apparatus for controlling read-out and/or synchronization between an external magnetic field and written data during a reading operation from a magneto-optical recording medium includes generating a pulse in a reading signal in a read-out layer by copyi... | 04/01/2008 |
| 7349315 | Information recording method, information recording device, optical information recording medium, program for recording information and storage medium An information recording method including irradiating an optical information recording medium containing a phase change recording layer on a substrate having a guide groove with continuous light of a laser beam having an erase power level Pe to determine a transitio... | 03/25/2008 |
| 7321481 | Optical recording medium An optical recording medium includes a substrate, a light transmission layer and a plurality of recording layers between the substrate and the light transmission layer and capable of recording data in the plurality of recording layers and reproducing data recorded i... | 01/22/2008 |
| 7276274 | Optical recording medium and method for recording and reproducing data An optical recording medium includes a substrate, a light transmission layer and a plurality of recording layers between the substrate and the light transmission layer and capable of recording data in the plurality of recording layers and reproducing data recorded i... | 10/02/2007 |
| 7274643 | Information recording and reproducing apparatus and information recording medium It is an object of the present invention to provide an information recording and reproducing technique capable of improving the reliability of information recorded on a recording medium. A recording condition comprising amplitude information and the ratio of the amp... | 09/25/2007 |
| 7248552 | Method and apparatus for determining recording pulse parameters for an optical disc If data is recorded using a disc with deviating characteristics and a recorder with deviating characteristics, data will not be appropriately recorded, and errors will occur in the read signal. Standard recording pulse parameters specifying recording pulse positions... | 07/24/2007 |
| 7231649 | Optical recording medium and method for optically recording data in the same An optical recording medium includes a substrate, a first recording layer formed on the substrate and containing an element selected from the group consisting of Si, Sn and Ge as a primary component, and a second recording layer located in the vicinity of the first ... | 06/12/2007 |
| 7221630 | Information recording medium, information recording and reproduction method, and information recording and reproduction apparatus An information recording medium includes a data area for recording data; and a drive information area for recording at least one piece of drive information. The data area is divided into a plurality of segmented areas in a radial direction of the information recordi... | 05/22/2007 |
| 7193943 | Optical disk apparatus, optical recording method, optical recording program and storage medium An optical disk apparatus is disclosed. A light emitting element emits a laser beam directed to a recordable optical disk. A driver rotates the optical disk. A first optimum recording power obtaining part performs test recording on the optical disk while the optical... | 03/20/2007 |
| 7193933 | Preheating bulk erasing device for magneto-optical disk When carrying out magnetization, annealing, and initialization of a recording film by applying a laser beam to the recording film while rotating an optical recording medium 10 by a motor 11, light of a strong visible-light lamp 15 is projected a... | 03/20/2007 |
| 7187635 | Optical information reproducing method and apparatus for performing reproduction compensation The present invention provides an optical information reproducing method of detecting a record mark formed in an optical information recording medium and generating a reproduced signal, comprising the steps of: detecting a mark length of each record mark on basis of... | 03/06/2007 |
| 7161876 | Magneto-optical recording medium, and method for recording information in a recording layer A magneto-optical recording medium includes a substrate and a reproducing layer and a recording layer provided on the substrate. A recording magnetic domain is provided in the recording layer by heating the recording layer by irradiation with light and applying a re... | 01/09/2007 |
| 7149154 | Medium and method for providing a desirable direct overwriting characteristic for optical data recorded at different linear recording velocities It is an object of the present invention to provide a method for recording information in an optical recording medium with a good direct overwriting characteristic. The method for recording information in an optical recording medium according to the present inventio... | 12/12/2006 |
| 7133344 | Disk recording-playback device A disk recording-playback device including a laser drive circuit for feeding a drive signal to an optical head and adjusting the power of a laser beam irradiated by the optical head, an error correcting circuit for detecting an error rate of a reproduced signal, and... | 11/07/2006 |
| 7126886 | Magneto-optical recording medium and method for producing the same According to the present invention, a light beam is radiated to an area between recording tracks while the intensity of a magnetic field from the outside to a magneto-optical recording medium is suppressed to 50 Oe or less, whereby magnetic anisotropy formed between... | 10/24/2006 |
| 7123561 | Device that records on an optical disc and method thereof A device that records information on an optical disc and a method for recording the information on the optical disc, so as to maintain a constant recording quality when the information is recorded on the optical disc using a constant number of the rotations to contr... | 10/17/2006 |
| 7110328 | Recording and reproducing apparatus for recording and reproducing information to and from a magneto-optical storage medium An information recording/reproducing apparatus for recording and reproducing information to and from a magneto-optical storage medium that includes a first magnetic layer for recording at least information, a second magnetic layer for regulating a switched connectiv... | 09/19/2006 |
| 7106678 | Disk playback device The present invention provides a disk playback device comprising a laser drive circuit 15 for feeding a drive signal to an optical head 4 and adjusting the power of a laser beam irradiated by the optical head 4, an error correcting circuit 11... | 09/12/2006 |
| 7072250 | Magneto-optical storage medium and optical disk drive A magneto-optical storage medium that protects against the effects of cross-talk, making it possible to further reduce the level of track density, and which also makes it possible to conduct high-density recording/playback with a reduced magnetic field for erasure a... | 07/04/2006 |
| 7065012 | Optical storage device and emission control method An optical storage device decreases the influence of return light to the laser light source and prevents an increase of power consumption even if high frequency superimposing is performed. The optical storage device applies drive current, to which a high frequency s... | 06/20/2006 |
| 7054244 | Modulation signal generator for producing original disc of optical disc The present invention relates to a modulated signal generator capable of carrying out signal processing at a higher speed or capable of supporting a special format and a new format with ease. A modulation processing storing unit 130 has a modulation processin... | 05/30/2006 |
| 7027365 | Magneto-optical recording for improved domain expansion reading The present invention relates to magneto-optical recording technique whereby improved domain expansion reading is achieved. A mark region is recorded as a sub-mark portion and an adjacent sub-space portion, wherein the length of the sub-mark portion is set to be les... | 04/11/2006 |
| 7020049 | Apparatus using a detected light beam power at a start of change of a magnetized state for setting a reproducing light beam In a magneto-optical disk drive using a domain wall moving magneto-optical recording medium, a test-writing operation adjustment to deal wit dynamic fluctuation factors is minimized, and a reproducing or recording laser power is automatically optimized. A power of a... | 03/28/2006 |
| 7006414 | Optical disk device An optical disk device for writing information on an optical disk having an APC part for monitored driving of a laser diode is provided which performs first and second OPCs. An unused partition of a test area and reference power value are read out from the optical d... | 02/28/2006 |
| 6996055 | Optical recording medium and method for optically recording data in the same An optical recording medium includes a substrate, a first recording layer formed on the substrate and containing an element selected from the group consisting of Si, Ge, C and Al as a primary component, and a second recording layer located in the vicinity of the fir... | 02/07/2006 |
| 6965545 | Optical recording medium with prepit regions and recording/reproducing method thereof An information recording medium for reproducing information by irradiation with a laser beam condensed by an objective lens with a numerical aperture NA includes a disk-shaped substrate and a recording layer disposed on the substrate. On the surface of the substrate... | 11/15/2005 |
| 6961860 | Method and system for optimizing power consumption during data read/write operation in disk-based memory A method and system for optimizing energy consumption during data read/write operations in a disk-based memory system is provided. The method includes the steps of reading a data clip length, Ls and determining an available energy-optimum recordable track... | 11/01/2005 |
| 6944100 | Method for reproducing information data from a magneto-optical storage medium in reverse direction with recording A magneto-optical recording/reproducing method is disclosed which causes a laser beam to be emitted to a disc recording medium having information recorded thereon earlier by magnetic field modulation, the laser beam causing the disc recording medium to develop a tem... | 09/13/2005 |
| 6842711 | Power calibration system The present invention provides a high precision, low cost laser power calibration system. First, the photo signals output from a standard photo diode are received by a photo calibration system; then a set of standards consisting of the corresponding current signals ... | 01/11/2005 |
| 6809994 | Method for controlling radiation power of domain expansion type magneto-optical recording medium The present invention relates to a method, an apparatus and a record carrier for controlling radiation power and/or field strength during a reading operation from a magneto-optical recording medium comprising a storage layer and a read-out layer. An expanded domain ... | 10/26/2004 |
| 6751166 | Phase error detection method for magnetic wall displacement type of magneto-optical recording device A phase error detection apparatus and method is disclosed whereby a data signal is played back at a high S/N ratio from a magneto-optical disk making use of a ghost signal by magnetic domain wall displacement detection while the playback laser poser is kept at an op... | 06/15/2004 |
| 6744700 | Optical output adjusting apparatus based on shortest recording marks A reproducing laser output can be adjusted to an optimal level. To this end, a magneto-optical disk device includes a differential amplifier and a shortest recording mark identifier that detects a shortest recording mark reproducing signal corresponding to a compone... | 06/01/2004 |
