Patent application number | Description | Published |
20080285426 | Information Recording Method And Information Recording Device - An information recording method and device for recording information by irradiating an optical information recording medium with an energy beam includes forming a first recording mark by irradiation of a monopulse-shaped energy beam having at least a first power level and a second power level that is higher than the first power level, and forming a space succeeding the first recording mark with a write strategy having a downward pulse of a third power level that is lower than the first power level on a backside of a midpoint of the space. | 11-20-2008 |
20090017251 | MULTI-INFORMATION-LAYER RECORDING MEDIUM AND MANUFACTURING PROCESS - In forming a space layer of a multi-formation-layer recording medium, there are provided a medium having a high precision in a thickness of the space layer and its manufacturing process. In the multi-formation-layer recording medium wherein at least two pairs of an information recording layer and a translucency spacer are layered on a substrate having physical patterns composed of an optical spot groove and/or pits on the surface, an average thickness of the translucency spacers in an information zone is 15 μm or less, and a difference in spacer thickness between a minimum value and a maximum value is 2 μm or less. | 01-15-2009 |
20090040897 | Reproducing signal measuring method, signal reproducing apparatus, and optical recording medium - Regarding a signal recorded with a first frequency in a recording area on a specific first recording layer and a signal recorded with a second frequency different from the first frequency in a recording area on a second recording layer which might cause interlayer crosstalk in relation to the first recording layer, a reproducing signal measurement method for a multilayer optical recording medium having at least three recording layers includes reproducing the signal recorded in the recording area on the first recording layer, separating signals recorded respectively with the first and second frequencies, discriminating signal amplitude of the first frequency and a maximum value in signal amplitude of the second frequency, and calculating a signal amplitude ratio between them to measure interlayer crosstalk contained in the signal reproduced from the recording area on the first recording layer. Thus, the interlayer crosstalk quantity caused by unnecessary light can be measured quantitatively. | 02-12-2009 |
20090086602 | OPTICAL INFORMATION REPRODUCING METHOD, OPTICAL INFORMATION REPRODUCING APPARATUS AND OPTICAL INFORMATION RECORDING MEDIUM - Reproduction on an optical recording medium having plural information layers involves the problem of distortion occurring due to interlayer crosstalk and hence deterioration in the quality of a readout signal. At a predetermined radius, a correction coefficient for correcting the amount of fluctuation components is calculated from a readout signal with distortion due to the interlayer crosstalk, and then is stored. The stored correction coefficient is used to eliminate crosstalk components and to correct readout signal fluctuation during reproduction on a predetermined area. In this way, the original readout signal without interlayer crosstalk components can be obtained, so that good-quality reproduction characteristics can be achieved. | 04-02-2009 |
20090252005 | Test writing method and information recording device - The object of the present invention is to provide a test writing method for seeking the optimum write power correctly and in a short time under a high speed recording condition in a test writing method and an information recording device for recording information by forming different marks from the unrecorded part by injecting energy onto the recording medium. To achieve the above object, even number length marks and odd number length marks are separately test written in the 2T strategy to seek the respective optimum write power. Due to the possibility of enhancing the precision of test writing, a good recording ability can be obtained. | 10-08-2009 |
20100271917 | TEST-WRITE METHOD, INFORMATION RECORDING METHOD, AND INFORMATION RECORDING APPARATUS - A test-write method for accurately and quickly determining recording conditions, and an apparatus suitable therefor. In a 2T-based strategy, recording pulse conditions are determined by separately test-writing an even-number length mark and an odd-number length mark, and then the relative positions of the even-number length mark and the odd-number length mark at the recording pulse start time are adjusted. | 10-28-2010 |
20110049454 | SEMICONDUCTOR DEVICE - In a phase-change memory, an interface layer is inserted between a chalcogenide material layer and a plug. The interface layer is arranged so as not to cover the entire interface of a plug-like electrode. When the plug is formed at an upper part than the chalcogenide layer, the degree of integration is increased. The interface layer is formed by carrying out sputtering using an oxide target, or, by forming a metal film by carrying out sputtering using a metal target followed by oxidizing the metal film in an oxidation atmosphere such as oxygen radical, oxygen plasma, etc. | 03-03-2011 |
20130229895 | MAGNETIC HEAD, MAGNETIC RECORDING METHOD AND APPARATUS FOR CONTROLLING MAGNETIC HEAD WITH SPIN TORQUE OSCILLATOR IN A DISK DRIVE - A microwave assisted magnetic recording head includes a recording magnetic pole unit that produces a recording field for writing to a perpendicular magnetic recording medium, and a high-frequency magnetic field oscillator that produces a high-frequency magnetic field. The recording magnetic pole unit includes a magnetic core with a write gap portion at which a main recording field component is concentrated, and the high-frequency magnetic field oscillator is disposed in the write gap. | 09-05-2013 |