Patent application number | Description | Published |
20090086606 | Optical Information Recording/Reproducing Apparatus and Disk Distinction Method - An optical information recording/reproducing apparatus includes an optical source unit that emits an optical beam toward an optical information recording medium mounted on the apparatus, an optical receiving unit that receives a reflected beam of the optical beam reflected from the optical information recording medium or a transmitted beam of the optical beam transmitted through the optical information recording medium to output an output signal in response to the reflected beam or transmitted beam, and a distinction unit that discriminates whether the optical information recording medium is a hologram disk for recording information by using a holography or a reflection-type optical disk for reproducing information by virtue of the reflected beam, in accordance with the output signal output. | 04-02-2009 |
20090092013 | OPTICAL DISC APPARATUS, INFORMATION RECORDING METHOD AND INFORMATION RECORDING MEDIUM - When executing an replacement process on a multi-layer recording optical disc, alternate recording regions are successively used starting at the nearest spare area from an objective lens regardless of the layer where the replacement process is generated. Alternatively, in the spare area of each layer, a priority spare area is provided for executing an alternation with a higher priority by shifting the radial position from the other layer. Alternatively, arrangement is performed so that the radial position or the alternative recording start radial position of the spare area of each layer is not superposed on the upper or the lower layer spare area. | 04-09-2009 |
20090092018 | RECORDING MODULATION CIRCUIT, RECORDING MODULATION METHOD AND OPTICAL DISK APPARATUS - After a transfer error detection circuit detects a transfer error that transfer data from a memory controller to a recording modulation circuit is delayed for a recording clock process, the number of transfer errors is counted in units of sync frame in a transfer error count circuit. When the number of transfer errors is n times (n: positive integer) or less, the modulation and recording operation are continued as it is and the NRZI output operation is performed from the correct position while applying a sync, and when the number of transfer errors is n times or larger, the recording operation is interrupted and the re-recording is performed from the interrupted location thereafter. | 04-09-2009 |
20090147637 | OPTICAL DISK REPRODUCING DEVICE AND PHASE-LOCKED LOOP CIRCUIT - Provided is an optical disk reproducing device for controlling false detection of synchronization signals due to intersymbol interference, and stably improving accuracy of frequency acquisition of a PLL even when offset and so on occur. A signal width close to an original mark length is obtained to use for frequency acquisition of the PLL by, for example, using two different slice thresholds and taking a width between a rising of a result of slicing at one threshold and a falling of a result of slicing at the other threshold as a synchronization signal width. When asymmetric properties due to offset, asymmetry, etc. occur, an amount of corrections on the slice threshold is calculated, and it is reflected on a threshold previously set to always obtain a correct synchronization signal width. | 06-11-2009 |
20090310458 | OPTICAL DISK APPARATUS, INFORMATION RECORDING METHOD, SIGNAL PROCESSING LSI, AND LASER DRIVER - The present invention aims to, when recording pulse information are transmitted to a laser driver lying over a pickup through an optical disk, reduce the number of transmission paths or lines from a conventional transmission method and avoid degradation of recording performance due to transmission path characteristics upon fastening of a recording speed thereby to provide stable recording performance at high-speed recording. The invention of the present application reduces the number of transmission signals by encoding multi-level laser pulse information transmitted by the laser driver. Further, gray codes are used for encoding to reduce constraints of skew between bits. Furthermore, encoding is executed using each state transition and the state transitions are switched according to each recording mark and space, thereby reducing the occurrence of a short pulse on each transmission path. In addition, the presence or absence of the encoding is switched to enable signal transmission, thereby making it possible to make compatible adaptation to complex laser pulse information and adaptation to high-speed recording. | 12-17-2009 |
20090310463 | OPTICAL INFORMATION RECORDING APPARATUS AND OPTICAL INFORMATION RECORDING METHOD - A need to effectively record data of various sizes on a large-capacity holographic memory capable of high-speed recording is achieved, for example, by curing a first part of the holographic recording which is able to be multiplex-recorded in one or more units of a predetermined volume, and by not recording/curing a second part which is not able to be multiplex-recorded in a predetermined volume at a timing when the first recording part is cured. Also the above need can be achieved by, another example, by adding dummy data to the second part. Alternatively, the second part can be recorded on another track, in which it is possible to record in different units, e.g. by bit recording in a track that utilizes a DVD recording format. According to the present examples, we can record data of various sizes on the holographic memory effectively while performing large-capacity and high-speed holographic recording. | 12-17-2009 |
20090316561 | Optical Information Recording Method, Optical Information Reproduction Method and Optical Disk Device - When a phase shift is to be evaluated, based on a difference between an output from a waveform equalization circuit to equalize an input reproduced signal to a predetermined target equalization characteristic and the target equalization characteristic, the phase shift of the reproduced signal relative to a channel clock, a group delay characteristic with respect to the frequency of the waveform equalization circuit is fixed. Hence, an equalized waveform as an output from the waveform equalization circuit can preserve phase shift information of the inputted reproduced signal to correctly detect the phase shift of the reproduced waveform using the equalized waveform. It is hence possible to realize, with high precision, optimal value learning of various parameters for the recording, reproduction, and servo by use of the phase shift as an index. | 12-24-2009 |
20100202276 | RECORDING MEDIUM, ADDRESS GENERATING AND DETECTION METHOD, AND REPRODUCTION AND RECORDING APPARATUS - A recording medium, an address generating method, an address detection method and a recording and reproduction apparatus capable of extending the wobble address without any considerable wobble restructuring are disclosed. Virtual bits not recorded in the disc and expressed by the difference of the rule or the presence or absence of the information embedded in a part or the whole of the wobble address are generated. Thus, the extended address can be obtained without changing the number of bits of the address embedded in the wobble. | 08-12-2010 |
20100214898 | INFORMATION RECORDING MEDIUM, ADDRESS GENERATION AND DETECTION METHOD, AND REPRODUCING AND RECORDING APPARATUSES - In a recording medium, an extension address is obtained without changing the number of bits of the address embedded in the wobble. The wobble address is partially or wholly encoded to embed the address information. At the time of reproducing the address information, the original address information is obtained by restoring the embedded information by the decoding process. | 08-26-2010 |
20100226238 | OPTICAL DISC, OPTICAL DISC RECORDING APPARATUS, OPTICAL DISC REPRODUCING APPARATUS, INFORMATION RECORDING METHOD, INFORMATION REPRODUCING METHOD, AND INFORMATION RECORDING-REPRODUCING METHOD - A configuration for reading out disc management information easily without errors from a disc in which recording is conducted with data recording densities of a plurality of kinds. An optical disc includes a plurality of data recording areas in which information is recorded with data recording densities which are different from each other. Information of the data recording densities in the data recording areas is recorded in a management information recording area (a BCA area or a PIC area) by using a unique format which does not depend upon the data recording densities of the data recording areas. The divided data recording areas are disposed in the same plane of the disc, or disposed over a plurality of recording layers. | 09-09-2010 |
20100284257 | ADJUSTING METHOD FOR RECORDING CONDITION AND OPTICAL DISC DEVICE - In a optical disc system with constraint length equal to or greater than 5, under assumption that continuous 2T count included in a predetermined evaluation bit array is denoted by i and that length of evaluation bit array of interest is given by (5+2 | 11-11-2010 |
20100309764 | MULTILAYERED OPTICAL DISK AND ITS RECORDING METHOD - To provide a recording method of a multilayered optical disk having three or more recording layers, for performing recording while securing sufficient test areas without reducing user data areas, and while suitably controlling the power of laser beam irradiated onto each of the layers. The method uses an optical disk which has at least a first recording layer and a second recording layer located on the side nearer to the light incident surface than the first recording layer, and which respectively has a first test area configured by a plurality of segments in the first recording layer and a second test area configured by a plurality of segments in the second recording layer. Further, the method is configured such that there is defined beforehand a predetermined radial distance L corresponding to relative precision of radial positions between the plurality of layers and the optical spot diameter, and that when an arbitrary segment in the second test area is test-recorded, a segment in the first test area, the radial distance of which from the recorded test area in the second test area is within the range of the predetermined radial distance L, is set as a segment in which the test recording is not performed. Thereby, even in the case where the radial positions of the test areas of the plurality of layers are substantially overlapped with each other, it is possible to precisely perform the learning of optical power. For this reason, it is possible to use and arrange the test areas of the plurality of layers without waste. Further, the learning of recording power can be performed without receiving the influence of the recorded state of the other layers, so that the accuracy of the learning of recording power can be improved. Thereby, it is possible to improve the quality of recording and the reliability of recorded data. | 12-09-2010 |
20110026381 | OPTICAL DISK APPARATUS AND ITS REPRODUCING METHOD - Amplitude and frequency of a high-frequency signal superposed on a reproduction laser beam are changed in accordance with a reproduction spot diameter on the surface of the recording layer upon discrimination of an optical disk in initial adjustment after insertion of the optical disk and change of a layer of a multi-layer optical disk. Further, the high-frequency signal is not superposed on the reproduction laser beam until end of the discrimination and change to a target layer upon discrimination of the optical disk and change of a layer of a multi-layer optical disk. | 02-03-2011 |
20110032806 | OPTICAL DISC AND OPTICAL DISC APPARATUS - An optical disc recording method for recording disc information to be used in recording/reproducing control on an optical disc, comprises the following steps of: providing a first disc information unit and a second disc information unit, each having a predetermined data size, in a predetermined management information area of the optical disc; the disc information includes write strategy information; separating the write strategy information into first write strategy information and second write strategy information; recording the first disc information into the first disc information unit; and recording the second disc information into the second disc information unit. | 02-10-2011 |
20110096641 | OPTICAL DISC, OPTICAL DISC RECORDING/PLAYBACK APPARATUS, AND INFORMATION RECORDING/PLAYBACK METHOD - For a disc on which recording is to be performed at a plurality of recording densities, a technique for easily reading out disc management information without an error is disclosed. An optical disc ( | 04-28-2011 |
20110096656 | Multi-Layer Optical Disc, And Recording Method And Apparatus For Multi-Layer Optical Disc - Each layer includes a data recording area and a test writing area divided into a plurality of small areas, wherein the small areas of the test writing area are recorded in advance so that other each layer can make a combination of recorded and unrecorded states with respect to the small area, where OPC is carried out, in a layer where OPC is carried out. Moreover, OPC is carried out to each small area, where a combination of recorded/unrecorded states of other each layer differs from each other, to thereby calculate, as the optimum power, an average value of the result of each OPC or a central value of the dispersion thereof. | 04-28-2011 |
20110103206 | Optical Disk Apparatus and Information Recording Method - In an optical disk apparatus, by obtaining the temperature in the vicinity of a laser in the apparatus, the power source voltage of the laser driver is controlled such that power consumed by the headroom of the laser driver is reduced to the maximum extent without deteriorating the current drive characteristic of the headroom when the temperature becomes higher. The laser driving current of the laser driver is monitored to control the power source of the laser driver such that the power consumed by the headroom is possibly reduced while maintaining the current drive characteristic of the headroom for the monitored current. | 05-05-2011 |
20110158069 | RECORDING/REPRODUCING APPARATUS AND RECORDING/REPRODUCING METHOD - An optical disc apparatus capable of deriving optimum laser beam power even when OPC areas overlap with one another and a method for the apparatus. OPC result is recorded to an optical disc and OPC (area-saving OPC) that reduces an area use quantity by using the OPC result is executed and optimum laser power is determined. | 06-30-2011 |
20110317535 | Multilayered Optical Disk And Its Recording Method - A multilayered optical disk an information recording method and information reproducing method utilizing the disk includes three or more recordable or rewritable information recording layers, which has, among the plurality of information recording layers, at least a first recording layer and a second recording layer located on a side nearer to a light incident surface than the first recording layer, and which respectively has a first test area configured by a plurality of segments in the first recording layer, a second test area configured by a plurality of segments in the second recording layer, and comprising a specific area in which there is recorded information used to determine whether or not the respective segments in the first test area can be used. | 12-29-2011 |
20120201111 | OPTICAL DISK REPRODUCING DEVICE AND PHASE-LOCKED LOOP CIRCUIT - An optical disk reproducing device for controlling false detection of synchronization signals due to intersymbol interference, and stably improving accuracy of frequency acquisition of a phase locked loop (PLL) even when offset and so on occur. A signal width close to an original mark length is obtained to use for frequency acquisition of the PLL by, for example, using two different slice thresholds and taking a width between a rising of a result of slicing at one threshold and a falling of a result of slicing at the other threshold as a synchronization signal width. When asymmetric properties due to offset, asymmetry, etc. occur, an amount of corrections on the slice threshold is calculated, and it is reflected on a threshold previously set to always obtain a correct synchronization signal width. | 08-09-2012 |
20120243393 | OPTICAL INFORMATION RECORDING METHOD, OPTICAL INFORMATION REPRODUCTION METHOD AND OPTICAL DISK DEVICE - When a phase shift is to be evaluated, based on a difference between an output from a waveform equalization circuit to equalize an input reproduced signal to a predetermined target equalization characteristic and the target equalization characteristic, the phase shift of the reproduced signal relative to a channel clock, a group delay characteristic with respect to the frequency of the waveform equalization circuit is fixed. Hence, an equalized waveform as an output from the waveform equalization circuit can preserve phase shift information of the inputted reproduced signal to correctly detect the phase shift of the reproduced waveform using the equalized waveform. It is hence possible to realize, with high precision, optimal value learning of various parameters for the recording, reproduction, and servo by use of the phase shift as an index. | 09-27-2012 |
20130039159 | OPTICAL DISK APPARATUS AND ITS REPRODUCING METHOD - Amplitude and frequency of a high-frequency signal superposed on a reproduction laser beam are changed in accordance with a reproduction spot diameter on the surface of the recording layer upon discrimination of an optical disk in initial adjustment after insertion of the optical disk and change of a layer of a multi-layer optical disk. Further, the high-frequency signal is not superposed on the reproduction laser beam until end of the discrimination and change to a target layer upon discrimination of the optical disk and change of a layer of a multi-layer optical disk. | 02-14-2013 |
20130044578 | INFORMATION RECORDING MEDIUM, ADDRESS GENERATION AND DETECTION METHOD, AND REPRODUCING AND RECORDING APPARATUSES - In a recording medium, an extension address is obtained without changing the number of bits of the address embedded in the wobble. The wobble address is partially or wholly encoded to embed the address information. At the time of reproducing the address information, the original address information is obtained by restoring the embedded information by the decoding process. | 02-21-2013 |