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| Number | Title | Issue Date |
| 7551524 | Methods and apparatus to compensate for power output variations over time A method of compensating for output variations in laser power output over time in a system using a laser to record visible marks on an optical disc, the method comprising (a) applying a test light beam from the laser to the optical disc to determine a test value of ... | 06/23/2009 |
| 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 |
| 7420580 | Laser power calibration in an optical disc drive Various systems, methods, and programs embodied on a computer-readable medium are provided for calibrating a laser power in an optical disc drive. In one embodiment, a range of reflectivity of an optical disc in the optical disc drive is established. A calibration p... | 09/02/2008 |
| 7366073 | Information recording apparatus and method, and computer program product An information recording apparatus is provided with: a recording device for recording information into recording areas of an information recording medium by irradiating laser light; a reference-output-value holding device for holding a reference-output-value of the ... | 04/29/2008 |
| 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 |
| 7317665 | Optical recording method using multiplexer and plural pieces of data bits Information recording equipment of the present invention includes a multiplexer to generate n pieces of synchronous high-speed pulses. Instead of a normal m:1 multiplexer configuration for parallel-serial conversion, an m:n multiplexer configuration is used which ge... | 01/08/2008 |
| 7289408 | Method and apparatus for reproducing recording mark below diffraction limit of light from optical recording medium The object of the present invention is to realize reduction of the level jitter generated from a noise component at a signal saturation level or a waveform distortion in a portion except for signal polarity portions (rising edge and falling edge), and good error cha... | 10/30/2007 |
| 7274644 | Information recording device and information recording method When a bias power level of a recording pulse waveform is varied entirely or partially, a shape of the recording pulse wave form is varied according to the variation. For example, when the bias power level is increased, a width or an edge position of a top pulse or a... | 09/25/2007 |
| 7272089 | Optical disc recording under adjustable conditions Prior to a main record, a trial write of data in an optical disc is performed in accordance with the characteristics between a record velocity and an optimum record power (Steps S2 to S4). The quality of a signal reproduced from the trial-written data ... | 09/18/2007 |
| 7236438 | 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... | 06/26/2007 |
| 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 |
| 7170841 | Information recording medium, recording apparatus, reproduction apparatus, recording method, and reproduction method An information recording medium is provided, which comprises a plurality of recording layers and a first disc information area for storing parameters relating to access to the plurality of recording layers and formats relating to the plurality of recording layer. Th... | 01/30/2007 |
| 7145857 | Apparatus and method for generating write pulse appropriate for various optical recording media A write pulse generating apparatus includes a control unit which provides information on an optical recording medium type and information on a recording speed factor, and a control signal generating unit which determines a multi-pulse type which is to be generated i... | 12/05/2006 |
| 7136328 | Magneto-optical recording device capable of setting the time phase of laser pulses and magnetic fields The present invention provides a magneto-optical recording method capable of securing a sufficient phase margin, even if a recording power or medium temperature fluctuates, and obtaining a reproduction signal having a preferable quality, wherein the time phases of a... | 11/14/2006 |
| 7092319 | Power calibration method and apparatus for optical disc A power calibration apparatus identifies a calibration area divided by an EFM frame unit on an optical disc and controls writing by a writing means. According to read out information for test writing written in the optical disc, a first writing power is calculated. ... | 08/15/2006 |
| 7085210 | Optical disc drive having OPC control unit for controlling the level of power of the laser beam for recording and reading data from an optical disc An optical disc drive has an OPC control unit that records the signal to a plurality of frames in the predetermined test area on the optical disc using a plurality of recording power values and repeatedly records the signal to another plurality of frames in the pred... | 08/01/2006 |
| 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 |
| 7002890 | High density analog recording using write symbols having distinguishable readout waveforms A method of recording data on a recording medium includes mapping the data to a set of write symbols wherein each write symbol represents more than one bit of the data. The set of write symbols is defined by defining a set of variable write parameters; generating a ... | 02/21/2006 |
| 6980490 | Optical disk and manufacturing method for the same An optical disk is made of tracks that are magnetically separated from one another by scanning a focused light beam over lands between tracks at a predetermined power and annealing to lower the magnetic anisotropy of a magnetic layer on the lands, and is provided wi... | 12/27/2005 |
| 6975572 | Optical disc apparatus with regulation of recording velocity and laser power A test recording is performed with respect to an optical disc prior to a regular recording, and a β value for setting a qualitative parameter relating to the level of the recording state within a preferable range is derived from a result of the test recording. Then... | 12/13/2005 |
| 6967914 | Optical recorder and laser power control method An optical recording apparatus obtains the most appropriate recording laser power state in real time according to an environmental mark-generation condition. When data is recorded (mark is generated) by emitting pulse-train-manner laser outputs to an organic-pigment... | 11/22/2005 |
| 6954415 | Light source drive, optical information recording apparatus, and optical information recording method A light source drive which modulates a light source so as to cause the same to emit a light, includes: a superposition current generation part which generates a superposition current approximately corresponding to a charging/discharging current needed for a capacita... | 10/11/2005 |
| 6950377 | Information recording method and information recording apparatus An information recording method of recording information, in which laser light is applied to a recording medium while depending on predetermined information said laser light is modulated and the intensity of said light is controlled to form recording mark areas at w... | 09/27/2005 |
| 6775218 | High density data write strategy A system and method are disclosed for recording information on a phase change medium is disclosed. The method includes irradiating a region of the phase change medium with a first dose of laser energy. A first portion of the region is irradiated with a second dose o... | 08/10/2004 |
| 6661744 | MSR magneto-optical recording medium, recording and reproducing method therefor, and storage unit using MSR magneto-optical recording medium A storage unit having functions of controlling a write power, a read power and a reproducing magnetic field with respect to an optical recording medium, is provided with a first section for storing test write data on the optical recording medium for each ... | 12/09/2003 |
| 6650599 | Method and apparatus for determining power level of laser beam in magneto-optical recording device A reproducing apparatus reproduces a signal recorded in a magneto-optical disk. The magneto-optical disk includes a layered structure having a recording layer, an intermediate layer and a reproducing layer. Laser light is illuminated from an optical head ... | 11/18/2003 |
| 6556516 | Reproducing method and reproducing apparatus for magneto-optical recording medium using different radiation patterns External magnetic fields H(x) or reproducing light beams L(x) having different intensity patterns are applied to an identical recording position on a magneto-optical recording medium so that different pieces of information corresponding to the patterns ar... | 04/29/2003 |
| 6552967 | 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 t... | 04/22/2003 |
| 6545954 | Optical disk device using a recording medium structurally arranged to generate a recording clock A high-speed large capacity file system is built in which the track density is improved by applying a highly precise magnetic domain width control technique to a light pulse-irradiated magnetic field modulation magnetooptical disk device which can be over... | 04/08/2003 |
| 6515814 | Device and method for reproducing magnetic signal The present invention provides a magnetic signal reproducing device including heating means for locally heating a reproducing region of a magnetic recording medium, first reproducing means for reading magnetic information in the reproducing region in a fi... | 02/04/2003 |
| 6469960 | Magneto-optical storage apparatus capable of adjusting the magnetic field strength In an information storage apparatus for recording information in a recording medium by applying an external magnetic field to a position illuminated by the light beam, an external magnetic field control part controls an external magnetic field strength ba... | 10/22/2002 |
| 6414912 | Optical disk device using a recording medium structurally arranged to generate a recording clock A high-speed large capacity file system is built in which the track density is improved by applying a highly precise magnetic domain width control technique to a light pulse-irradiated magnetic field modulation magnetooptical disk device which can be over... | 07/02/2002 |
| 6269056 | Recording method for a magneto-optical recording medium for position adjustment of a magnetic head A reading method for a magneto-optical recording medium is provided, irradiating laser light as a reading beam and using a magnetic head. High density and high transmission rate are possible and a correct reading can be performed according to the length o... | 07/31/2001 |
| 6125085 | Optical recording method and device for optimally controlling the width of the recording marks A method and apparatus are provided for optimally controlling the width of recording marks formed by a light beam on an optical recording medium in an optical recording apparatus. The method is accomplished by selecting and storing in a storage device a p... | 09/26/2000 |
| 6125084 | Optical disk device using a recording medium structurally arranged to generate a recording clock A high-speed large capacity file system is built in which the track density is improved by applying a highly precise magnetic domain width control technique to a light pulse-irradiated magnetic field modulation magnetooptical disk device which can be over... | 09/26/2000 |
| 5862103 | Magneto-optical recording method capable of determining optimum laser beam intensities A method and apparatus for recording data on a magnetooptical recording medium finds an optimum laser beam intensities for recording. The method and apparatus do not cause a low level PL setting to become excessively low and poor overwriting of... | 01/19/1999 |
| 5831943 | Stabilized overwriteable optical recording method using laser beam intensity settings A stabilized overwriteable optical recording method, wherein overwriting is performed sufficiently because erasure does not become poor with the low level laser beam intensity PL being set too low. In a method of setting the recording laser bea... | 11/03/1998 |
| 5825724 | Magneto-optical recording method using laser beam intensity setting based on playback signal A method of performing stabilized overwriteable optical recording, wherein overwriting is performed sufficiently even when erasure becomes poor when the low level laser beam intensity PL is set too low. The low level of recording laser beam int... | 10/20/1998 |
| 5808972 | Stabilized overwriteable optical recording method using laser beam intensity settings A stabilized overwriteable optical recording method, wherein overwriting is performed sufficiently because erasure does not become poor with a low level laser beam intensity PL set too low. The method includes setting the recording laser beam i... | 09/15/1998 |
| 5790482 | Optical disk apparatus for recording information using a light intensity modulation method with a partial response detector An optical disk apparatus is capable of recording, reproduction and erasure by a laser beam. The user data is recorded in a RAM area on an optical disk by a recording device including a modulation encoder and a recording waveform generator. At the time of... | 08/04/1998 |
