Patent application number | Description | Published |
20080205236 | OPTICAL INFORMATION RECORDING MEDIUM AND OPTICAL INFORMATION REPRODUCING METHOD - A disc structure for making an inverted optical response through a super-resolution process using a recorded mark portion and a space portion, which is realized to amplify a signal amplitude and solve a conventional problem that a conventional super-resolution technique can obtain only small signals, since the super-resolution area is reduced to realize high density recording of data. | 08-28-2008 |
20080267050 | INFORMATION RECORDING MEDIA AND PLAYBACK POWER DETERMINING METHOD FOR SIGNAL PLAYBACK - A super resolution optical disk medium having an array of pits less than or equal in size to optical resolution is disclosed, wherein the pits are read by using heat generated within the medium upon irradiation of a read laser beam. A playback power determination method for use with the disk is also disclosed. A playback power level at which super resolution occurs is determined based on a bit error rate (bER) of the optical disk and the amplitude of a playback signal having a predefined signal pattern. In the optical disk, NR/SR is set to one (1) or less, where SR is the signal obtained from a high-temperature region in case the playback is performed in the state that the super resolution occurs, and NR is the amplitude of a signal which is read in the absence of such super resolution. | 10-30-2008 |
20080285431 | Optical disk medium and tracking method - A super-resolution material is formed in only a data pit, in a low temperature state of the super-resolution material, reflectivity of each of a pit portion and a space portion and an optical phase difference therebetween are set to be sufficiently small, in a high temperature state, and at least the optical phase difference between the pit and the space is set to be larger than the aforementioned value in an absolute value. Accordingly, by conducting irradiation with an appropriate read power by which substantially only one data track width can be heated to a high temperature state, a good push-pull signal can be obtained even with a track pitch being less than a diffraction limit. At the same time, by an optical device having functions such as a switching means with a DPP type, an offset correcting means of the push-pull signal due to lens shift, a shaping means of the push-pull signal, a learning means of read power, and the like, there is provided an optical disk device that corresponds to the optical disk medium of the present invention and achieves an increase in capacity. | 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 |
20090080311 | OPTICAL INFORMATION REPRODUCING METHOD, OPTICAL INFORMATION REPRODUCING DEVICE, AND OPTICAL INFORMATION RECORDING MEDIUM - In a super-resolution optical disk for the purpose of achieving an increase in the density of recording data by reproducing a recording mark smaller than optical resolution, the optimum reproduction power needs to be determined since the quality of a super-resolution reproduced signal strongly depends on the reproduction laser power. However, since the track error signal required for tracking servo also depends on the reproduction power, there is a need for a method for determining the reproduction power taking into account both the stabilization of tracking servo and a quality improvement of the reproduction signal. The reproduction power is changed under conditions with focusing servo applied but without application of tracking servo. Thereby, a cross track signal is detected to identify a reproduction power region that leads to quality improvement of both a reproduction signal and a track error signal. | 03-26-2009 |
20090106627 | Digital information reproduction method - An optical disc using super-resolution effects that achieves higher-density recording exceeding the optical resolution suffers from the signal-quality degradation caused by the normal resolution component included in the reproduction signal. To address this problem, a data reproduction method is provided. In the method, characteristic error patterns are identified and parity check codes in conformity with run-length limited coding are used to carry out efficient and reliable error correction. Error patterns caused by the normal resolution crosstalk are localized in the leading edges of a mark following a long space and in the trailing edges of a long mark. Whether an error exists in the data is determined by use of the parity check codes. When an error occurs, a pattern in which an error is most likely to occur is selected from the above-mentioned patterns by taking account of the edge shift direction, and then the error therein is corrected. | 04-23-2009 |
20090116363 | INFORMATION STORAGE DEVICE AND STORAGE MEDIA - In an information memory apparatus having minute areas for storing information arranged in x, y and z directions three-dimensionally, parallel rays are irradiated to a memory area MA in a direction perpendicular to a z-axis to take projection images of the memory area MA while rotating the memory area MA around the z-axis little by little. The light rays irradiated at this time have a size which covers at least a direction of an x-y plane of the memory area. A computation unit PU finds data and addresses of minute areas distributed three-dimensionally by performing computation based upon the principle of computer tomography on the projection images. As for data writing, a change is given to optical transmissivity or light emission characteristics by irradiating laser light focused by a lens OL placed outside the memory area to a desired minute area and causing heat denaturation within the pertinent minute area. | 05-07-2009 |
20090154304 | Information memory device and memory medium - An information memory device using an electromagnetic-wave resonance phenomenon is provided to achieve both high density and long-period storage of stored data. Memory cells are three-dimensionally arranged in the inside of a solid-like medium which is not contacted with a surface of the medium, and the memory cell has resonance characteristics to electromagnetic waves depending on the space coordinates of the memory cell. For the medium, a material is selected so that an electromagnetic wave having the resonance frequency of the memory cell. By observing absorption spectra of the irradiated electromagnetic wave or emission spectra after the absorption, three-dimensional space coordinates of the memory cell are calculated. | 06-18-2009 |
20090303861 | INFORMATION RECORDING AND READOUT METHOD - Provided is a medium capable of implementing a large-capacity recording at low cost per bit. A medium including a network of metal wires and recording materials each provided at an intersection of the metal wires. Surface plasmons are made to propagate along the metal wires. Two surface plasmons are made to propagate in two different directions and to collide with each other at a certain position. Multiple-layer recording is carried out by changing the recording materials at the certain position. | 12-10-2009 |
20100083295 | INFORMATION RECORDING MEDIUM AND OPTICAL RECORDING/REPRODUCING APPARATUS - When a super resolution technology for optical disks is used in a situation where optical disk management information is formed with a signal that cannot be reproduced by a reproduction method based on a conventional optical disk technology, optical disk drives cannot make recording adjustments and/or reproduction adjustments. | 04-01-2010 |
20100232268 | METHOD AND APPARATUS FOR RECORDING AND REPRODUCING OPTICAL INFORMATION, AND RECORDING MEDIUM - Ordinary optical disks need the resetting of recording conditions in the course of recording to cope with changes in ambient temperature, laser temperature, and medium's recording sensitivity. Optical disks for super-resolution reproduction which are intended to reproduce record marks smaller than the optical resolution, thereby increasing the recording density, need the resetting of recording conditions as well as the condition of super-resolution reproduction because the quality of reproduced signals depends largely on the power for super-resolution reproduction. The power for recording as well as the power for super-resolution reproduction is therefore changed in the course of test recording to detect the deviation from the optimum value of the recording condition to obtain the optimum recording power. In this case, it is also desirable to change the power for super-resolution reproduction in proportion to the power for recording. | 09-16-2010 |
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 |
20100290328 | REPRODUCING POWER ADJUSTING METHOD, OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS AND INFORMATION RECORDING MEDIA - By referring to a table of reproducing conditions and medium specific parameters, stored in an optical disc or optical disc apparatus and/or generated by the optical disc apparatus, the medium specific parameters to be used for performing reproducing power adjustment are changed in accordance with the reproducing condition to execute reproducing power adjustment. | 11-18-2010 |
20110158062 | INFORMATION PROCESSING SYSTEM - In an information storage device in which small compartments each for storing information are arranged three-dimensionally inside a solid body, the solid body having at least one pair of parallel planar portions on its surface is used for a memory medium. The information to be stored is divided into bits and stored in discrete minute areas that distribute three-dimensionally inside the memory medium. Anisotropy is given to the pitch of the memory cell and the pitch in a direction right-angled to the planar portion is made larger than the pitch in the parallel direction. Moreover, the data such that given n-bits are used as a unit is converted into a digital format such that m-bits larger than n are used as a unit and the number of included ‘1s’ is smaller than n, which is recorded in the memory medium. When recording the data on the medium, pieces of the data expressed by the m-bits are arranged on the plate in the right-angle direction. | 06-30-2011 |
20110235408 | SEMICONDUCTOR MEMORY DEVICE - For decreasing a recording current and suppressing a cross erase simultaneously, a three-dimensional phase-change memory for attaining higher sensitivity and higher reliability by the provision of a chalcogenide type interface layer is provided, in which an electric resistivity, a thermal conductivity, and a melting point of the material of the interface layer are selected appropriately, thereby improving the current concentration to the phase-change material and thermal and material insulation property with Si channel upon writing. | 09-29-2011 |
20130141968 | SEMICONDUCTOR STORAGE DEVICE - The purpose of the present invention is to improve a rewriting transmission rate and reliability of a phase change memory. To attain the purpose, a plurality of phase change memory cells (SMC or USMC) which are provided in series between a word line ( | 06-06-2013 |
20130194902 | INFORMATION PROCESSING SYSTEM - An information storage device has small compartments for storing information in a solid body and can be used as a memory medium. The solid body can have at least one pair of parallel planar portions on its surface. The information is divided into bits and stored in discrete minute areas that are distributed three-dimensionally inside the memory medium. The data can be converted into a digital format for storage to regulate the number of ‘1s’ recorded in a direction of the memory medium. | 08-01-2013 |