Abstract: It is an object of certain inventive aspects to provide a recording condition closer to an optimum even for a medium unknown to a drive, and more particularly, to provide means for obtaining a preferable recording condition even for a high-speed recording in which conducting a test recording is difficult. In order to accomplish the object, a power and a phase of a recording pulse are simultaneously corrected at predetermined timing, depending on a recording speed or a recording position such as an inner or outer circumference. For instance, a phase shift ?Phase generated due to a continuing recording from an inner circumference to an outer circumference at ×2 speed is corrected simultaneously with a correction of a power shift at the timing when a recording speed is changed from ×2 to ×4. For the other recording speed, in the same manner as above, a power and a phase shift are simultaneously corrected at every time when a recording speed is changed.

Abstract: A recording condition on a media is optimized by introducing a new evaluation index. An apparatus for optical information recording and reproducing includes: a measurement means for recording codes including a specific code in a medium for optical information recording and reproducing, reproducing the codes from the medium for optical information recording and reproducing, and measuring, from a reproduced signal of the codes, a peak value of amplitude of a reproduced signal related to the specific code, the peak value being a maximum value or a minimum value of the amplitude of the reproduced signal related to the specific code; a statistic calculation means for calculating preset statistic by using a plurality of peak values at the same or different recording places, the plurality of peak value having been obtained by the measurement means; and a condition decision means for deciding at least one of a recording laser power condition and a recording pulse condition by using the statistic.

Abstract: It is an object of the present invention to improve a margin to meet good recording quality by conducting a realtime correction of a recording condition of a medium with different recording characteristics for inner and outer circumferences. To accomplish the object, control factors for power and a pulse width are independently detected and corrected using an mT pulse having a length of m?T as a pulse for power control and an nT pulse having a length of n?T as a pulse for pulse width control; more specifically, power correction for mT pulse and pulse width correction for nT pulse are conducted in realtime, wherein a recording pulse stream including the mT pulse and nT pulse is irradiated onto a medium by a recording laser beam as well as pits and spaces formed by irradiation of the recording pulse stream are reproduced by a reproducing laser beam to detect the effects of power and pulse width variations independently.

Abstract: There are provided an optical recording method, an optical recording apparatus, a one-chip CPU device, and a computer program. Reference data corresponding to a recording condition of a first recording layer, a physical characteristic value correlated with the recording condition, and a physical characteristic value correlated with a recording condition of a second recording layer are extracted from a data table in a memory, and the recording condition of the extracted reference data is set as a recording condition of a recording medium as an information recording target. When no correlated reference data exists, the closest reference data are extracted from the data table, and a recording pulse condition suitable for recording information on the second recording layer of an optical disk as the information recording target is extracted on the basis of the correlation between the recording condition of the reference data and the physical characteristic value.

Abstract: The present invention enables a recording condition closer to an optimum to be obtained even for media unknown to a drive. The present invention provides a method that is especially effective for the case where it is applied to a code identification scheme, such as PRML in which code identification is performed on the basis of information on the amplitude of an RF signal. A condition for a recording pulse comprised of a top pulse, an intermediate pulse and a last pulse is configured in a predetermined order, that is, a reference condition is first determined by a test recording involving an examination of recording quality and changes in conditions for a power and a pulse width, then a condition for the last pulse is determined by a test recording using the reference condition, and subsequently a condition for the intermediate pulse is determined using the reference condition and the last pulse.

Abstract: In certain inventive aspects there are provided an optical recording method, an evaluation indicator acquiring method, an optical recording apparatus, and a CPU device, which can save a test time before recording information. An irradiation condition suitable for recording information on a first recording layer is extracted by recording and reproducing test information. The test information is recorded on and reproduced from a second recording layer. The irradiation condition suitable for recording information on the second recording layer is extracted on the basis of the test result for the first recording layer and the test result for the second recording layer. Accordingly, it is possible to save the test time for extracting the irradiation condition of the second recording layer.

Abstract: An optical information recording method in an optical recording generation method for performing recording and reproduction of information by radiating laser light which is pulse-modulated according to a recording waveform having a plurality of setting parameters onto a storage medium is disclosed. The method comprises reading information recorded in the storage medium; determining positions corresponding to a detection pattern from the detection pattern and a reproduction signal, the detection pattern being defined according to a specific parameter from among the plurality of setting parameters, and the reproduction signal being obtained by reading the information; detecting the state of the reproduction signal according to the result of the determination; generating an ideal reproduction signal according to the detection pattern; and obtaining a predetermined signal evaluation index value using the result of detection of the state of the reproduction signal and the ideal reproduction signal.

Abstract: An optical information recording reproduction device is disclosed which finds the correlation between the ratio of the minimum pit amplitude to the maximum pit amplitude of an RF signal obtained from the light reflected by the pits recorded on an optical disk in a tracking servo mode and spherical aberration in advance, and stores it. In recoding information on the optical disk, the optical information recording reproduction device calculates the ratio of the minimum pit amplitude to the maximum pit amplitude of the RF signal, and compares the calculation to the stored correlation, and feeds back to an aberration correction optical system and a driving mechanical system to correct the aberration into an aplanatic state.

Abstract: Several drives individually carry out recording and playback with a reference medium that serves as a reference for quality for various media, obtaining characteristic values. The characteristic values are multiplied by a predetermined coefficient to obtain thresholds, and the thresholds are stored in predetermined storage areas of the respective drives. When information is to be recorded on a medium, recording and playback are carried out with the medium under a plurality of recording conditions involving variation in power or pulse width, thereby obtaining characteristic values. Then, an approximated curve is obtained from the characteristic values. The quality of recording on the medium is tested based on an amount of margin that is determined according to positional relationship between the approximated curve and the threshold.

Abstract: In a recording method or apparatus, in order to set an optimal recording condition by a minimal number of times of testing, test recording is carried out while changing power and pulse width of recording pulses in a stepwise manner. Conditions for the test recording are concentrated in a region of a matrix defined by power×pulse width.

Abstract: The invention provides a method effective in detecting a reproduction signal in real time correction in which correction is simultaneously performed with recording. In this method, a laser beam emitted from a laser diode 110 is divided into a plurality of beam spots by a diffraction grating 114. One of the plurality of beam spots is used as a beam spot for recording, and another beam spot is used as a beam spot for reproduction. Reflected light components obtained from these beam spots are independently detected by a detector 122. A period for which a recording laser beam is in an ON state is referred to as a gate signal, and a mask is put on an RF signal obtained from a beam spot for reproduction, thereby selectively detecting pits reproduced when the recording laser beam is in the ON state.

Abstract: Playback durability of a writable optical disk is ensured. A method of controlling a playback condition includes continuously irradiating an optical disk with a laser beam having a power level lower than a mark formation level and detecting a change of a state of a signal caused by a return light from the optical disk, and setting a playback condition for the optical disk according to the change of the state of the signal. The playback durability of the optical disk can be ensured by adaptively controlling the playback condition as stated above.

Abstract: An optical disc recording method includes: determining that an optical disc to be recorded is an optical disc including a recording layer comprising organic dye; and controlling a laser such that space formation power Ps necessary for space formation is equal to or smaller than bias power Pbw. In a case wherein the relation of Ps<Pbw is satisfied, the relation between the asymmetry value, ? value, and main power Pw includes substantial linearity. Accordingly, control of the main power Pw can be performed with the asymmetry value and ? value as evaluation indexes, and accordingly, disturbance or the like can be readily handled.

Abstract: In a recording method or apparatus, in order to set an optimal recording condition by a minimal number of times of testing, test recording is carried out while changing power and pulse width of recording pulses in a stepwise manner. Conditions for the test recording are concentrated in a region of a matrix defined by power×pulse width.

Abstract: A condition of a recording pulse comprising a top pulse and a following pulse is determined in a predetermined order. In some embodiments, an mT pulse condition is first determined by test recordings with various power and pulse conditions, involving an inspection of recording quality; then an m?T/(n?m)T ratio is determined by test recording under the mT pulse condition fixed; and finally an nT pulse is configured based on the ratio. A phase shift can be corrected by test recording with the nT pulse.

Abstract: There is disclosed a method of permitting recording setup information required to perform a test recording on an optical disk to be obtained from an external device as the need arises. The method comprises the steps of: measuring an evaluation index associated with recording characteristics with which data was recorded on the optical disk by an optical disk drive; making a decision as to whether the measured evaluation index indicates a state in which recording setup information used in data recording by the optical disk drive should be updated; acquiring recording setup information corresponding to at least the machine ID of the optical disk drive and the medium ID of the optical disk when the evaluation index is judged to indicate the state in which the recording setup information should be updated; and setting the acquired recording setup information in the optical disk drive.

Abstract: A method for obtaining and setting recording setting information, including: obtaining device identification information of an optical disc recording/playback device; transmitting a recording setting information request signal including at least the device identification information to a server connected through a network; receiving recording setting information corresponding to at least the device identification information transmitted from the server based on the recording setting information request signal; and storing the received recording setting information in memory within the optical disc recording/playback device. Thus, for example, recording setting information as to all of optical discs may be obtained and set as much as possible in a case wherein access to the server can be performed, whereby even a case can be handled wherein data recording is carried out as to various types of optical discs later.

Abstract: A processing method of an optical disc recording/playback signal includes: measuring a length of a first mark of a predetermined coding length which appears immediately following a shortest space recorded on the optical disc; measuring a length of a second mark which appears immediately following a longest space recorded on the optical disc and which has the same coding length as the first mark; and calculating a heat interference amount based on a difference of the measured length of the first mark and the measured length of the second mark. The method may further include specifying a laser power at a time of forming a space or a cooling pulse width, according to the heat interference amount.

Abstract: A recording condition adjusting method of an optical disc recording/playing system, including the steps of: measuring a playing signal obtained by playing a result written in an optical disc; determining whether or not an asymmetry value calculated from the result of the measuring can be employed for adjustment of recording power; calculating a predetermined statistic according to a peak local maximal value and/or a peak local minimal value of an amplitude of a playing signal according to specified codes from the result in the measuring, in the case of determining that the asymmetry value cannot be employed for adjustment of recording power; and deciding the recording power based on the predetermined statistic.

Abstract: Provided are an optical information recording device, an optical information recording method, and an optical information recording medium which provide an appropriate recording characteristic even when a disturbance occurs during information recording. A drive forms record marks and spaces by irradiating blue-purple laser light to an optical disk, for which an organic dye exhibiting a predetermined absorption factor with respect to light having a wavelength of at or near 405 nm is used, and thus records information. For recording of information, the power of the blue-purple laser light is controlled using writing power used for forming record marks, space formation power used for forming spaces that may be higher than read power used for reproducing information recorded in an optical information recording medium, and bias power higher than read power.