Source: https://patents.google.com/patent/US7738336
Timestamp: 2018-03-23 15:12:47
Document Index: 288181590

Matched Legal Cases: ['art 131', 'art 132', 'art 131', 'art 132', 'art 131', 'art 132']

US7738336B2 - Apparatus and method for optical information recording and reproducing - Google Patents
Apparatus and method for optical information recording and reproducing Download PDF
US7738336B2
US7738336B2 US11638199 US63819906A US7738336B2 US 7738336 B2 US7738336 B2 US 7738336B2 US 11638199 US11638199 US 11638199 US 63819906 A US63819906 A US 63819906A US 7738336 B2 US7738336 B2 US 7738336B2
US11638199
US20070159946A1 (en )
Mitsuo Sekiguchi
Fuyuki Miyazawa
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. The peak value and the statistic thereof serving as a new evaluation index are effective for evaluation of the apparatus for optical information recording and reproducing or setting of a recording condition in the specification.
The quality of recording in an optical information recording system is decided by a characteristic of an apparatus for optical information recording and reproducing (hereinafter, referred to as a ‘drive’), a medium for optical information recording and reproducing (hereinafter, referred to as a ‘media’ or a disk), and a recording condition (including recording data rate, recording laser power, recording pulse, and effect due to disturbance). In addition, the quality of recording needs to satisfy a level at which recorded data can be accurately reproduced.
Hereinafter, an example of the configuration of a recording pulse in embodiments of the invention will be described with reference to FIG. 1. In the embodiments of the invention, an example of using a multi pulse type including a plurality of pulse patterns is illustrated. As shown in FIG. 1, a recording pulse 10 includes a top pulse 12 disposed at the head and a subsequent pulse 14 subsequent to the top pulse 12. In addition, the subsequent pulse 14 includes a middle pulse 15 subsequent to the top pulse 12 and a last pulse 16 disposed at a last part of the recording pulse 10.
Here, assuming that the length of the recording pulse 10 is nT, the top pulse 12 has a length of mT and the subsequent pulse 14 has a length of (n-m) T. In the embodiment of the invention, it is assumed that m is 2 and n is a value in a range of 2 to 11. ‘T’ is unit time defined in an optical disk system, and a period is decided by a clock signal.
Then, the test recording is performed by using the laser power condition obtained in the step S100 and the last pulse obtained in the step S200, thereby deciding the recording condition of a middle pulse (step S300). The setting of the middle pulse is made by adjusting the widths of separate pulses forming the middle pulse. In the present embodiment since codes having a length of 4T or more use the middle pulse 15, the codes are adjusted. In order to adjust the middle pulse, for example, a condition is obtained in which a value of the asymmetry 2T11T indicating asymmetry of the amplitude value of the shortest code 2T and an amplitude value of a longest code 11T becomes a proper value, such as ‘0’. Here, it is possible to obtain a condition in which a bit error rate becomes a proper value such as ‘0’.
Setting of a Laser Power Condition in an Embodiment of the Invention 1. Configuration of a Drive in an Embodiment of the Invention
Hereinafter, a functional block diagram of drive and system according to an embodiment of the invention will be described with reference to FIG. 3. The drive and system according to the embodiment of the invention includes an apparatus for optical information recording and reproducing 100 and an I/O system 130, the I/O system 130 including a display part 131, such as a television set, and an operation part 132, such as a remote controller.
Hereinafter, a process in a first embodiment of the invention will be described with reference to FIGS. 4 to 9. First, the CPU 125 reads out a specified test recording condition stored in, for example, the memory 127 and sets the specified test recording condition in the LD driver 121 (step S101). The test recording condition includes a laser power condition. In addition, the CPU 125 causes the LD driver 121 to perform test recording on the disk 150 (step S103). The shape of a recording pulse in the test recording is a pulse train type multi pulse. Alternatively, the recording pulse in the test recording may be a non-multi pulse having a simple shape. In addition, the recording pulse pattern may be a random pattern or a specific pattern for test recording. In addition, the 2T code is included in a recording pulse pattern for the purpose of use in subsequent processes. The specific pattern for test recording is formed by combination of codes and the like used in the subsequent processes. In addition, the specific pattern for test recording may be recorded at one place or several times at a plurality of different places.
On the other hand, if it is determined that it is not necessary to adjust the recording condition in the step S107, the CPU 125 determines whether or not recording on the disk 150 is to be performed (step S111). In the step S111, the amount of adjustment of laser power, the amount of difference between peak values of amplitude, and the like are compared with reference values (in the case of specifying a range, an upper limit and a lower limit) that are stored in the memory 127 so as to make a determination on whether or not recording is to be performed, thereby determining whether or not the sufficient quality of recording above a predetermined reference can be obtained. In this case, it may be possible to prepare a plurality of reference values used to make a determination on whether or not recording is to be performed and then specify any one of ‘recordable at a specified recording data rate’, ‘recordable at a data rate lower than the specified recording data rate’, and ‘unrecordable’. In the case when recording cannot be performed at the specified recording data rate, for example, ‘recording at a data rate lower than a specified recording data rate’ and ‘record discontinuance’ may be displayed on the display part 131 through the I/F 128 such that either ‘recording at a data rate lower than a specified recording data rate’ or ‘record discontinuance’ is selected, and then a selection instruction from the operation part 132 may be received through the I/F 128. In addition, it may be possible to aid the selection of a user by displaying, for example, total time required for data recording. In addition, the ‘low-speed recording’ may be performed with levels divided. In this case, reference values corresponding to the levels are prepared and the determination is made by comparison with the reference values.
The process in the step S155 is performed by addressing into a recorded portion of the recording pulse pattern in the step S153 after the completion of the recording operation in the step S153. Here, the step S153 (recording) and the step S155 (reproduction) may be alternately performed, for example, in the order of ‘recording→reproduction→recording→reproduction→recording→reproduction→recording→reproduction . . . ’, or the step S153 may be continuously performed, for example, in the order of ‘recording→recording→recording→reproduction . . . ’ and then the step S155 may be performed.
For example, as shown in FIG. 13, in the case when the value of the asymmetry is also calculated in the step S155, it is possible to obtain a straight line f, which indicates the relation between recording laser power and a value of the asymmetry, on a graph in which a horizontal axis is recording laser power and a vertical axis is the value of the asymmetry. In FIG. 13, a plurality of points are plotted. However, for example, test recording by which two points can be plotted is first performed and then a straight line of forecast of a value of the asymmetry is generated by connecting the two points. Thereafter, recording laser power at which a value of the asymmetry becomes ‘0’ is specified on the basis of the straight line of forecast of a value of the asymmetry, and then test recording is performed again with the specified recording laser power. Thus, it is possible to check whether or not a dispersion has lowered as expected. If the dispersion has lowered as expected, recording laser power at that time is adopted. Alternatively, in FIGS. 12 and 13, it may be possible to specify optimal recording laser power after increasing the number of plots. In other words, processing, such as the test recording, may be performed by more precisely modifying the curve d and the straight line f and then specifying recording laser power at which the value of the asymmetry becomes ‘0’ on the basis of the modified straight line f.
On the other hand, if it is determined that it is not necessary to adjust the recording condition in the step S159, the CPU 125 determines whether or not recording on the disk 150 is to be performed (step S161). In the step S161, the dispersion of peak values of amplitude, recording laser power (or a difference between normal recording laser power and the recording laser power decided in the step S157), and the like are compared with reference values (in the case of specifying a range, an upper limit and a lower limit) that are stored in the memory 127 so as to make a determination on whether or not recording is to be performed, thereby determining whether or not the sufficient quality of recording above a predetermined reference can be obtained. In this case, it may be possible to prepare a plurality of reference values used to make a determination on whether or not recording is to be performed and then specify any one of ‘recordable at a specified recording data rate’, ‘recordable at a data rate lower than the specified recording data rate’, and ‘unrecordable’. In the case when recording cannot be performed at the specified recording data rate, for example, ‘recording at a data rate lower than a specified recording data rate’ and ‘record discontinuance’ may be displayed on the display part 131 through the I/F 128 such that either ‘recording at a data rate lower than a specified recording data rate’ or ‘record discontinuance’ is selected, and then a selection instruction from the operation part 132 may be received through the I/F 128. In addition, the ‘low-speed recording’ may be performed with levels divided. In this case, reference values corresponding to the levels are prepared and the determination is made by comparison with the reference values.
In the above embodiments, an example has been described in which reference data and reference values, such as a target value, are stored in the memory 127; however, the reference data and the reference value are not necessarily stored in the memory 127. For example, the reference data and reference values may be stored in the disk 150. In the case when the reference data and reference values are stored in the disk 150, the reference data and reference values are stored in a Lead-in area shown in FIG. 14. The Lead-in area is mainly divided into a system Lead-in area, a connection area, and a data Lead-in area. The system Lead-in area includes an initial zone, a buffer zone, a control data zone, and a buffer zone. Further, the connection area includes a connection zone. Furthermore, the data Lead-in area includes a guard track zone, a disc test zone, a drive test zone, a guard track zone, an RMD duplication zone, a recording management zone, an R-physical format information zone, and a reference code zone. In the present embodiment, a recording condition data zone 170 is included in the control data zone of the system Lead-in area.
In the first and second embodiments, an example has been described in which a television set and a remote controller are considered as the I/O system 130; however, as shown in FIG. 15, a personal computer 180 may be connected. Alternatively, the apparatus for optical information recording and reproducing 100 may be formed integrally with a personal computer.
US11638199 2005-12-14 2006-12-13 Apparatus and method for optical information recording and reproducing Active 2029-02-01 US7738336B2 (en)
JP2005-360699 2005-12-14
JP2005360699A JP4440207B2 (en) 2005-12-14 2005-12-14 The optical information recording and reproducing apparatus, an optical information recording processing method, an optical information recording medium, a program, and a central processing unit
US20070159946A1 true US20070159946A1 (en) 2007-07-12
US7738336B2 true US7738336B2 (en) 2010-06-15
ID=37907549
US11638199 Active 2029-02-01 US7738336B2 (en) 2005-12-14 2006-12-13 Apparatus and method for optical information recording and reproducing
US (1) US7738336B2 (en)
EP (1) EP1798725A3 (en)
JP (1) JP4440207B2 (en)
KR (1) KR100881662B1 (en)
CN (1) CN1983398B (en)
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