WO2011111366A1 - 記録方法、記録装置および情報記録媒体 - Google Patents
記録方法、記録装置および情報記録媒体 Download PDFInfo
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- WO2011111366A1 WO2011111366A1 PCT/JP2011/001335 JP2011001335W WO2011111366A1 WO 2011111366 A1 WO2011111366 A1 WO 2011111366A1 JP 2011001335 W JP2011001335 W JP 2011001335W WO 2011111366 A1 WO2011111366 A1 WO 2011111366A1
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0045—Recording
- G11B7/00456—Recording strategies, e.g. pulse sequences
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/006—Overwriting
- G11B7/0062—Overwriting strategies, e.g. recording pulse sequences with erasing level used for phase-change media
Definitions
- the present invention relates to a method and apparatus for recording information on an information recording medium, and an information recording medium.
- An apparatus for recording and reproducing information on an information recording medium is widely used as a means for recording a large amount of information.
- An optical disc is a well-known information recording medium.
- the optical disks include CD-R / RW, DVD ⁇ R / RW, DVD-RAM, Blu-ray Disc (hereinafter referred to as “BD”)-R / RE, HD DVD-R / RW / RAM, and the like.
- BD Blu-ray Disc
- the recording film of the rotating optical disc is irradiated with the narrowed laser beam.
- the recording film is changed by heat energy generated by irradiation with light having strong energy to form a recording mark.
- Information is recorded by making each of the formed recording marks and recording marks (a space) correspond to either digital “0” or “1”.
- information may be recorded with the switching point between the recording mark and the space as "0" or "1".
- the recording pulse forming one recording mark is composed of a plurality of parameters according to the length of the recording mark and the recording speed.
- the above-mentioned recording pulse is called a write strategy (sometimes described as “WS”).
- the simplest recording pulse is composed of a single rectangular pulse.
- the single rectangular pulse when recording a long mark whose recording mark length is several times T (T is the channel clock cycle), the single rectangular pulse has a thin front edge and a thick rear edge. It becomes a recording mark.
- the recording mark changes the recording film by thermal energy, the change in the recording film hardly occurs in the cooled state at the beginning of recording, and the recording mark becomes thin.
- the excessive heat storage causes deterioration of the recording film, which increases the possibility of deterioration of the recording quality.
- a multi-pulse type formed from a plurality of short pulses, or a laser power lower than the two pulses between two pulses, in which the thermal energy is not excessively accumulated at the end of recording, in the recording pulse
- a castle type that irradiates at the level, and an L-shape type without pulse on the end side of the castle type.
- Non-Patent Document 1 there is a description as shown in FIG. 1 as an example of the multi-pulse type in BD-RE.
- FIGS. 1A and 1B show the irradiation intensity of a laser beam and the pulse width and pulse position in the time axis direction as an example of parameters for forming the shape of a recording pulse.
- Parameters relating to the irradiation intensity of the laser light in FIG. 1 are the recording power Pw (101), the erasing power Pe (102), the cooling power Pc (103), and the bottom power Pb (104).
- the erasing power Pe (102) represents the laser power for forming the space portion in a rewritable information recording medium such as BD-RE, but as in BD-R, information is recorded only once from an unrecorded state.
- a rewritable information recording medium such as BD-RE
- BD-R information is recorded only once from an unrecorded state.
- the recordable information recording medium which can not be used, it may be called space power Ps.
- the parameters relating to the time axis direction in FIG. 1 can change values for each mark length, start pulse width Ttop (105, 108, 112), start pulse position dTtop (106, 109, 113), end pulse width The width Tlp (110, 114), the cooling pulse end position dTe (107, 111, 115), and the width Tmp (116) of the multi-pulse present above 4T (T is a channel clock).
- the parameters relating to the recording pulse are described in the information recording medium, some or all of the parameters relating to the laser power, the pulse width, and the pulse position are recorded in the permitted area in the information recording medium. Or may be held in an internal memory of the recording / reproducing apparatus or the like.
- the resolution depending on the detection system refers to the optical resolution according to the size of the light spot which has collected the laser light.
- FIG. 2 (a) shows an example of a 25 GB BD.
- the wavelength of the laser 201 is 405 nm
- the numerical aperture (Numeric Aperture; NA) of the objective lens 202 is 0.85.
- the recording data is recorded on the track 200 of the optical disk as the mark rows 203 and 204 of physical change.
- the shortest one of the mark lines is called the "shortest mark”.
- the mark 204 is the shortest mark.
- the physical length of the shortest mark 204 is 0.149 um. This corresponds to about 1 / 2.7 of DVD, and the light beam identifies the recording mark even if the laser resolution is increased by changing the wavelength parameter (405 nm) and the NA parameter (0.85) of the optical system. It is approaching the limit of optical resolution which is the limit that can be done.
- FIG. 3 shows a state in which the light beam is irradiated to the mark row recorded on the track.
- the light spot 205 is about 0.39 um due to the above optical system parameters.
- the recording mark becomes relatively smaller than the spot diameter of the light spot 205, so that the resolution of reproduction is deteriorated.
- FIG. 2 (b) shows an example of an optical disc having a recording density higher than that of a 25 GB BD.
- the wavelength of the laser 201 is 405 nm
- the numerical aperture (numerical aperture; NA) of the objective lens 202 is 0.85.
- the physical length of the shortest mark 206 is 0.1115 um.
- the spot diameter is about 0.39 um, but the recording mark becomes relatively small and the mark interval becomes narrow, so that the resolution of reproduction becomes worse.
- the amplitude of the reproduction signal when the recording mark is reproduced by the light beam decreases as the recording mark becomes shorter, and becomes zero at the limit of the optical resolution.
- the reciprocal of the period of the recording mark is called a spatial frequency.
- the transfer function of spatial frequency is called OTF (Optical Transfer Function).
- a function representing the amplitude dependency of the OTF on the spatial frequency is called MTF (Modulation Transfer Function).
- the signal amplitude indicated by MTF decreases approximately linearly as the spatial frequency increases.
- P ⁇ / (4 ⁇ NA).
- FIG. 4 is a graph showing the relationship between the MTF and the shortest recording mark in the case of a BD having a recording capacity of 25 GB per recording surface.
- the spatial frequency of the shortest mark of BD is lower than the MTF cutoff, and is about 80% of the cutoff main fraction. It can be seen that the amplitude of the reproduction signal of the shortest mark is as small as about 10% of the amplitude of the long mark even in the BD of the recording density of 25 GB.
- the spatial frequency of the shortest mark of the BD is very close to the OTF cutoff, that is, when the reproduction amplitude hardly appears, the recording capacity of the BD corresponds to about 31.3 GB.
- FIG. 2 schematically shows the light beam and the recording mark when the recording mark row is recorded on the optical disk using the light beam.
- FIG. 2A shows the case where the shortest recording mark is 149 nm, and all the recording marks are recorded within the range not exceeding the MTF cutoff frequency.
- FIG. 2B shows an example where the recording density of the optical disc is further improved.
- FIG. 5 shows the case where the spatial frequency of the shortest mark (2T) is higher than the MTF cut-off frequency and lower than the MTF cut-off frequency except for 2T.
- the recording density is the same as BD. It will be about 33.3 GB in size.
- a recording pulse Stability is also required against various stresses such as the variation in the time axis direction of the laser light, the focusing state of the laser beam, and the state of tracking control.
- the 2T mark 602 is formed by the 2T recording pulse 601.
- the 3T mark 603 which is a 1T long mark is shown for comparison.
- the 2T recording pulse 601 represents the duration of the recording power Pw (101), the recording power Pw (101), the erasing power Pe (102), the cooling power Pc (103), and the recording power Pw (101). ), 2T-dTe (107) representing the end position of the cooling power Pc (103) period.
- xT-Ttop indicates Ttop corresponding to the xT mark
- xT-dTe indicates dTe corresponding to the xT mark. The same applies to other dTtop, Tlp, etc.
- the recording power Pw (101) gives the amount of heat that changes on the recording surface of the information recording medium.
- the write-once type information recording medium it is common that a change occurs and information is recorded only by giving a heat amount.
- Rewritable media generally have a recording mark formed by being rapidly cooled by a cooling power.
- the conventional method described above is a method on the premise that the length of the recording mark does not reach the limit of the optical resolution of the laser beam, and recording of a mark having a length shorter than the limit of the optical resolution Not assumed. Therefore, it is very difficult to properly record a mark of short length beyond the limit of optical resolution. In order to properly record marks of short length above the optical resolution limit, another method is required.
- the present invention has been made to solve the above-mentioned conventional problems, and it is possible to stably record a mark of a length shorter than the limit of optical resolution in a high density information recording medium. Recording method, recording apparatus, and information recording medium on which such recording conditions are recorded.
- the recording method of the present invention is a recording method of condensing a laser beam with a lens and recording a data string in which a mark and a space are combined on an information recording medium, wherein the optical resolution of the laser beam is exceeded It is characterized in that the condition of the cooling pulse when forming the mark of short length and the condition of the cooling pulse when forming the mark of length not reaching the limit of the optical resolution of the laser light are different. Do.
- the length of the mark is P
- the wavelength of the laser light is ⁇
- the numerical aperture of the lens is NA
- the length of the light beam is shorter than the optical resolution limit of the laser light.
- the mark is a mark satisfying P ⁇ ⁇ / 4NA
- the mark having a length not reaching the optical resolution limit of the laser light is a mark satisfying P> ⁇ / 4NA.
- the width of the cooling pulse when forming the mark satisfying P ⁇ ⁇ / 4NA is set to zero, and the cooling pulse when forming the mark satisfying P> ⁇ / 4NA. Set the width to other than zero.
- the width of the cooling pulse when forming the mark satisfying P ⁇ ⁇ / 4NA, is set to zero regardless of the length of the space before and after the mark, and P> ⁇ / 4NA.
- the width of the cooling pulse is set to other than zero according to at least one of the length of the space before and after the mark.
- a recording apparatus includes an optical head unit having a lens for condensing a laser beam, and a control unit for controlling the pulse shape of a recording signal, and uses a data string combining marks and spaces as an information recording medium.
- the control unit is provided with a cooling pulse condition for forming a mark having a length shorter than the limit of the optical resolution of the laser light, and the optical resolution of the laser light. It is characterized in that the condition of the cooling pulse when forming a mark of a length which does not reach the limit is made different.
- the length of the mark is P
- the wavelength of the laser light is ⁇
- the numerical aperture of the lens is NA
- the length of the light beam is shorter than the optical resolution limit of the laser light.
- the mark is a mark satisfying P ⁇ ⁇ / 4NA
- the mark having a length not reaching the optical resolution limit of the laser light is a mark satisfying P> ⁇ / 4NA.
- control unit sets the width of the cooling pulse when forming the mark satisfying P ⁇ ⁇ / 4NA to zero and forms the mark satisfying P> ⁇ / 4NA.
- the width of the cooling pulse of is set to other than zero.
- the control unit when forming the mark satisfying P ⁇ ⁇ / 4NA, sets the width of the cooling pulse to zero regardless of the length of the space before and after the mark.
- the width of the cooling pulse is set to other than zero according to at least one of the length of the space before and after the mark.
- An information recording medium is an information recording medium on which a data string in which a mark and a space are combined is recorded by being irradiated with a laser beam collected by a lens, and the optical of the laser beam If the conditions of the cooling pulse when forming a mark of a short length beyond the limit of resolution and the conditions of a cooling pulse when forming a mark of a length not reaching the limit of the optical resolution of the laser light are different. It is characterized by comprising a disc information area in which the recording condition which has been made to be recorded is recorded.
- the condition of the cooling pulse when forming a mark having a length shorter than the optical resolution limit of the laser light, and the mark having a length not reaching the optical resolution limit of the laser light are made different.
- it is possible to stably record a mark having a short length beyond the limit of the optical resolution of laser light, and to record information on an information recording medium having a very high recording density and the information recording medium A recording method and a recording apparatus can be realized. Further, by recording such recording conditions in advance in the information recording medium, it is possible to realize an information recording medium with high compatibility, which can be stably recorded and reproduced even when used in various devices.
- the space before and after the mark when forming a mark of a short length (a mark satisfying P ⁇ ⁇ / 4NA) beyond the limit of the optical resolution of the laser light, the space before and after the mark When setting the width of the cooling pulse to zero regardless of the length and forming a mark with a length that does not reach the optical resolution limit (a mark that satisfies P> ⁇ / 4NA), the space before and after the mark Depending on at least one of the lengths, the width of the cooling pulse is set to other than zero. As a result, it is possible to realize stable recording while avoiding thermal interference in the space before and after.
- (A) And (b) is a figure which shows an example of the parameter of a recording pulse, and a recording pulse shape.
- (A) is a figure which shows the example of 25 GB BD
- (b) is a figure which shows the example of the optical disk of recording density higher than 25 GB BD. It is a figure which shows a mode that the light beam is irradiated to the mark row recorded on the track
- FIG. 1 is a view showing an optical disc apparatus according to Embodiment 1 of the present invention. It is a figure which shows an example of N / 2 type
- FIG. 1 is a view showing an optical disc apparatus according to Embodiment 1 of the present invention. It is a figure which shows an example of N / 2 type
- FIG. 10 is a diagram showing an example of the N / 2 type write strategy, and is a diagram showing an example of 4T recording pulse and 5T recording pulse.
- FIG. 16 is a diagram showing an example of the N / 2 type write strategy, and is a diagram showing an example of a 6T recording pulse and a 7T recording pulse. It is a figure which shows an example of the pulse width of a recording pulse of N / 2 type
- FIG. 7 is a diagram showing an example of the pulse width of the recording pulse of the N ⁇ 1 type write strategy and parameters of the pulse position. It is a figure which shows an example of a castle type
- FIG. 7 is a diagram showing an N ⁇ 1 type write strategy according to Embodiment 2 of the present invention.
- FIG. 7 is a diagram showing an N / 2 write strategy according to Embodiment 3 of the present invention. It is a figure which shows the information recording medium by embodiment of this invention. It is a figure which shows the information recording medium by embodiment of this invention.
- FIG. 7 is a view showing an optical disc apparatus 700 according to the present embodiment.
- the optical disc apparatus 700 is a recording apparatus for recording information on the loaded information recording medium 701.
- the optical disc apparatus 700 may also reproduce information from the information recording medium 701.
- the information recording medium 701 is a rewritable recording medium, and in this embodiment, a phase change rewritable optical disc is used.
- the optical disk apparatus 700 includes an optical head unit 702, a laser control unit 703, a recording pulse generation unit 704, a reproduction signal processing unit 705, a data processing unit 706, a controller unit 707, and a memory unit 708.
- the optical head unit 702 converges the laser beam having passed through the objective lens on the recording layer of the information recording medium 701, receives the reflected light, and generates an analog reproduction signal indicating the information recorded on the information recording medium 701. .
- the analog reproduction signal reproduced from the information recording medium 701 is subjected to signal processing by the reproduction signal processing unit 705.
- the reproduction signal processing unit 705 passes the binarized signal to the data processing unit 706.
- the data processing unit 706 generates reproduction data from the received binarized signal and passes it to the controller unit 707.
- the controller unit 707 passes the recording data and the recording pulse parameter to the recording pulse generation unit 704.
- This recording pulse parameter is recorded on the information recording medium 701.
- the recording pulse generation unit 704 generates a recording signal based on the received recording data and recording pulse parameters (adjusts the pulse shape of the recording signal).
- the recording pulse generation unit 704 passes the recording signal to the laser control unit 703.
- the laser control unit 703 that has received the generated recording signal controls the light emission of the laser mounted on the optical head unit 702 based on the recording signal, and forms a mark on the information recording medium 701.
- the lens of the optical head unit 702 condenses the laser beam on the information recording medium 701, and a data string in which the mark and the space are combined is recorded on the information recording medium 701.
- the wavelength of the laser is 405 nm
- the numerical aperture of the lens is 0.85
- a 1-7 code system is used as a code of recording modulation
- the track pitch is 320 nm.
- the shortest mark size 2T 111.6 nm
- the 2T mark is shorter than P, and the 3T mark or more is longer than P.
- the track pitch is 320 nm, so a disk of the same size as the 12 cm BD can realize a capacity of about 33.4 GB per surface. This is about 1.3 times the recording density of 25 GB, which is a BD, and a recording method for realizing such a high recording density will be specifically described below.
- the condition of the cooling pulse of 2T is realized by making it different from other recording marks.
- the width of the cooling pulse is made zero regardless of the length of the space before and after the mark.
- the cooling pulse width is zeroed according to at least one of the length of the space before and after the mark.
- 8A to 8C show a write strategy called N / 2 type.
- RLL (1, 7) when used as a recording code, it is used for a Sync pattern for detecting timings such as data start position from 2T mark (T is a channel clock) to 8T mark which is the shortest mark.
- a recording mark with the 9T mark added is formed.
- 8A to 8C show the recording pulse shapes of the 2T mark to the 8T mark among them.
- the 2T mark of the N / 2 type write strategy shown in FIG. 8A has a start time of 2T-dTtop 806 and a top pulse for emitting laser light with the recording power Pw 801 and a rise of the top pulse for the time defined by 2T-Top 805.
- a cooling pulse for emitting laser light with the cooling power Pc 803 is provided between the falling time and the rising time from the cooling power Pc 803 defined by 2T-dTe 807 to the erasing power Pe 802.
- the 3T mark of the N / 2 type write strategy shown in FIG. 8A has a start time of 3T-dTtop 809 and a top pulse for emitting laser light with the recording power Pw 801 and a rise of the top pulse for the time defined by 3T-Top 808. Between the fall time and the rise time from the cooling power Pc 803 defined by 3T-dTe 810 to the erasing power Pe 802, there is a cooling pulse that emits laser light with the cooling power Pc 803.
- the 4T mark of the N / 2 type write strategy shown in FIG. 8B has a start time of 4T-dTtop 831 as a start time, and a top pulse for emitting laser light with recording power Pw 801 and a fall of NRZI for a time defined by 4T-Top 830
- the 5T mark of the N / 2 type write strategy shown in FIG. 8B has a start time of 5T-dTtop 836 as the start time, and a top pulse for emitting laser light with recording power Pw 801 and a fall of NRZI for a time defined by 5T-Top 835
- the last pulse is defined by 5T-dTlp 837 based on 2T before, and the last pulse for laser emission with recording power Pw 801 and the last pulse from the falling time of the top pulse Until the rise time of the bottom power Pb804, and from the last pulse fall time to the rise time from the cooling power Pc 803 to the erasing power Pe 802 defined by 5T-dTe 839, the cooling power Laser emission at Pc 803 With a Nguparusu.
- the 6T mark of the N / 2 type write strategy shown in FIG. 8C has a start time of 6T-dTtop819 as the start time and a top pulse for emitting laser light with the recording power Pw801 and a fall of NRZI for the time defined by 6T-Top818.
- the time defined by 6T-dTlp 822 with 1T before the start as the start time, and the time defined by 6T-Tlp 821 is defined by Tmp 813 as the last pulse for laser emission with recording power Pw 801 and 3T after the rise of NRZI
- the time to be recorded is from multi-pulse emitting laser at recording power 801, from the falling time of top pulse to the rising time of multi-pulse, and from the falling time of multi-pulse to the rising time of last pulse, Bottom emitting laser with bottom power Pb804 Having a pulse, the last pulse fall time, between the cooling power PC 803 defined by 6T-dTe823 until the rise time of the erasing power Pe802, and a cooling pulse of laser emission at a cooling power PC 803.
- the 7T mark of the N / 2 type write strategy shown in FIG. 8C has a start time of 7T-dTtop 825 as the start time, and a top pulse for emitting laser light with recording power Pw 801 and a fall of NRZI for a time defined by 7T-Top 824
- the start time is the time defined by 7T-dTlp 828 based on 2T before and the last pulse for laser emission with recording power Pw 801 and the time defined by 7T-Tlp 827 and 3T after the rise of NRZI
- the time defined by 7T-dTmp 826 is a start time
- the time defined by Tmp 813 is a multipulse that emits laser light at recording power 801, the fall time of the top pulse to the rise time of the multipulse, and the multipulse Of the last pulse from the fall time of The time until the time is from the bottom pulse that emits laser at bottom power Pb804 and the last pulse fall time to the rise time from cooling power Pc
- the 8T mark of the N / 2 type write strategy shown in FIG. 8A has an 8T-dTtop 812 time point as the start time, and the time defined by the 8T-Top 811 is the top pulse for laser emission with the recording power Pw 801 and the falling edge of NRZI
- the start time is defined by 8T-dTlp 816 based on 1T before, and the last pulse for emitting laser light with recording power Pw 801 and the time defined by 8T-Tlp 815, and after 3T and 5T after rising of NRZI
- the time defined by Tmp 813 is from multi-pulse emitting laser at recording power 801, from the falling time of top pulse to the rising time of multi pulse, from the falling time of multi pulse to the rising time of multi pulse Interval and the fall time of the multipulse, Until the rise time of the bottom pulse, and from the last pulse fall time to the rise time from the cooling power Pc 803 defined by 8T-dTe 817 to the erasing power Pe
- bottom power Pb 804 ⁇ cooling power Pc 803 the present invention is not limited to this.
- Pb Pc or Pb> Pc may be satisfied.
- FIG. 9A shows an example of the pulse width of the recording pulse of the N / 2 type write strategy and parameters of the pulse position.
- the pulse width indicates a value of 0 or more, and the pulse position indicates a positive direction (closer to the start) as shown in FIGS. 8A to 8C. .
- the start position dTtop and top pulse width Ttop of the top pulse of each T are divided into 2T marks, 3T marks, even T marks of 4T or more, and odd T marks of 5T or more, and have parameters.
- dTtop and Ttop classify each mark in the front space length of 2T space, 3T space, 4T space, 5T space or more, and further, for the 2T mark, the back space length is 2T space, 3T space It is classified into the above and has parameters.
- the cooling pulse end position dTe of each T is divided into 2T marks, 3T marks, even T marks of 4T or more, and odd T marks of 5T or more, and has parameters.
- dTe classifies each mark with a back space length of 2T space, 3T space, 4T space, 5T space or more, and for a 2T mark, the front space length is 2T space or 3T space or more Classify and have parameters.
- the last pulse start position dTlp and last pulse width Tlp of the 4T or more mark having the last pulse are divided into even T marks of 4T or more and odd T marks of 5T or more and have parameters.
- dTlp and Tlp have parameters that are classified by the back space length of each mark by 2T space, 3T space, 4T space, 5T space or more.
- the multipulse start position dTmp of the 6T or more mark having multipulses is divided into even T marks of 6T or more and odd T marks of 7T or more, and the multipulse width Tmp is common to the 6T or more marks.
- the relationship between dTtop, Ttop and dTe of the 2T mark is set so as to satisfy the following equation (2) in relation to all the front and back spaces.
- 1T [ns]-Ttop [ns] + dTtop [ns]-dTe [ns] 0 [ns] ...
- the equation (2) does not have to be a calculation in ns unit, and each parameter takes, for example, the time of dividing T equally by k (k is an integer) as one step, and the pulse width and pulse position number of steps.
- k [step]-Ttop [step] + dTtop [step]-dTe [step] 0 [step] ... (3) It may be
- dTtop of 4T space-2T mark-3T or more is represented.
- FIG. 9B is a diagram specifically showing, for each pattern, a calculation formula that satisfies the formula (2) in the patterns of all the front and back spaces related to the 2T mark, using the symbols of FIG. 9A.
- the top pulse fall time determined by 2T-dTtop 806 and 2T-Top 805 is the same as the rise time from cooling power Pc 803 to erase power Pe 802 determined by 2T-dTe 807. Therefore, only the 2T recording pulse has no cooling pulse for emitting laser light with the cooling power Pc 803, and recording using only the top pulse is performed.
- the temperature of the recording medium can be stably obtained with a wide pulse width by widening Ttop which is the pulse width at the time of recording and eliminating the cooling pulse of 2T which is the minimum recording mark.
- Ttop which is the pulse width at the time of recording
- 2T which is the minimum recording mark.
- the present embodiment As described above, this problem is overcome by making the cooling pulse conditions different from 2T and 2T.
- the recording density is increased, the recording mark is not stably recorded, and the jitter is increased.
- the jitter can be reduced by about 30% and the power margin is also greatly improved.
- the recording conditions of the cooling pulse are made different from 2T and 2T, which are recording marks exceeding the optical resolution, so that the change in the length of the recording mark when the power changes becomes uniform. doing.
- the present invention can be applied to the N-1 type write strategy shown in FIGS. 11 and 12 and the write strategy called the castle type shown in FIGS. 13 and 14.
- the effect of the present embodiment is most remarkable when recording is performed under the recording conditions in which no cooling pulse is provided for all the recording marks exceeding the optical resolution. This is also derived from the recording principle of the minimum recording mark described above.
- the classification of the recording pulse parameter with respect to the front and back spaces of the recording mark is classified as 2T space, 3T space, 4T space, 5T or more space, but the present invention is not limited thereto.
- the classification may be further classified as 2T space, 3T space, 4T space, 5T space, 6T or more space, or the classification may be reduced as 2T space, 3T space, 4T or more space.
- the recording mark having the optical resolution or less the best effect as the recording performance can be obtained when the recording without the cooling pulse is performed uniformly.
- the mark length variation due to thermal interference can be corrected by adjusting the cooling pulse length according to the front and back space or front space or back space of the recording mark. Since correction is possible, higher density recording is possible.
- the 2T mark of the recording pulse parameter is classified by the combination of the front and back spaces, but the present invention is not limited to this.
- classification may be performed based on only the length of the space before dTtop or Ttop, or classification based on only the length of the space after dTe.
- RLL (1, 7) is used as the recording code, but the present invention is not limited to this.
- the shortest mark is not limited to 2T. Further, in the present embodiment, the recording density was obtained when the 2T mark exceeded the optical resolution, but according to the recording density, even the 3T mark and higher marks become less than the optical resolution. It is not necessarily limited to only 2T.
- the erasing power Pe is described as a rewritable information recording medium, but the present invention is not limited to this.
- the erase power Pe can be applied to the write-once information storage medium as the space power Ps.
- the recording pulse parameter is described in the information recording medium, but the present invention is not limited to this.
- it may be stored in the memory unit of the optical disk apparatus.
- the configuration of the optical disk apparatus according to the present embodiment is the same as the configuration of the optical disk apparatus 700 shown in FIG. Therefore, in describing the optical disk apparatus according to the present embodiment, reference will be continued to FIG.
- FIG. 7 is a view showing an optical disc apparatus 700 according to Embodiment 2 of the present invention.
- FIG. 11 shows a write strategy called N-1 type.
- RLL (1, 7) when used as a recording code, it is used for a Sync pattern for detecting timings such as data start position from 2T mark (T is a channel clock) to 8T mark which is the shortest mark.
- the recording pulse shape at the time of forming the recording mark to which the 9T mark is added is shown.
- the 2T mark of the N-1 write strategy shown in FIG. 11 has a start time of 2T-dTtop 1106 and a top pulse for emitting laser light with peak power Pw 1101 and a rise of the top pulse for the time defined by 2T-Top 1105.
- a cooling pulse for emitting laser light with cooling power Pc 1103 is provided between the down time and the rise time from cooling power Pc 1103 defined by 2T-dTs 1107 to space power Ps 1102.
- the 3T mark of the N-1 type write strategy shown in FIG. 11 has a start time of 3T-dTtop 1109 as the start time, and the time defined by 3T-Top 1108 is a top pulse that emits laser light with peak power Pw1101 and 2T after NRZI Is the start time, and the laser beam is emitted with bottom power Pb1104 from the last pulse which makes the laser emission with the peak power Pw1101 the time defined by 3T-Tlp1110 and the fall time of the top pulse to the rise time of the last pulse. It has a bottom pulse and a cooling pulse for emitting laser light at Pc 1103 from the last pulse falling time to the rising time from cooling power Pc 1103 to space power Ps 1102 defined by 3T-dTs 1111.
- the nT mark (here, n represents an integer of 4 to 9) of the N-1 write strategy shown in FIG. 11 uses the time of nT-dTtop 1113 as the start time, and the time defined by nT-Top 1112 is
- the start pulse is the time synchronized with the NRZI channel clock from the 2T after NRZI to the (n-1) T of NRZI as the start time, and the time defined by Tmp1116 is the peak power Pw1101
- the bottom power Pb1104 is the time until the next peak power Pw is emitted, the multipulse for laser emission and the (n-1) T after NRZI start time, and the time defined by nT-Tlp1114 is the peak power From the last pulse that emits laser at Pw1101 and the fall time of the last pulse, nT- Between cooling power Pc1103 defined in Ts1115 until the rise time of the space power Ps1102, and a cooling pulse of laser emission at Pc1103.
- bottom power Pb1104 ⁇ cooling power Pc1103, but the present invention is not limited to this.
- Pb Pc or Pb> Pc may be satisfied.
- FIG. 12 shows an example of the pulse width of the recording pulse of the N-1 write strategy and the parameters of the pulse position.
- the value representing the pulse width takes a value of 0 or more, and the value representing the pulse position is expressed with the direction in which the time is earlier (the side closer to the start end) as positive as shown in FIG.
- the start position dTtop and top pulse width Ttop of the top pulse of each T are divided into 2T marks, 3T marks, 4T marks, and 5T or more marks and have parameters.
- dTtop and Ttop classify each mark in the front space length of 2T space, 3T space, 4T space, 5T space or more, and further, for the 2T mark, the back space length is 2T space, 3T space It is classified into the above and has parameters.
- the cooling pulse end position dTe of each T is divided into 2T marks, 3T marks, 4T marks, 5T or more marks, and has parameters.
- dTe classifies each mark with a back space length of 2T space, 3T space, 4T space, 5T space or more, and for a 2T mark, the front space length is 2T space or 3T space or more Classify and have parameters.
- Last pulse start position dTlp and last pulse width Tlp of 3T or more mark having last pulse are divided into 3T mark, 4T mark, 5T or more mark and have parameters.
- dTlp and Tlp have parameters that are classified by the back space length of each mark by 2T space, 3T space, 4T space, 5T space or more.
- the multi-pulse width Tmp of 4 T or more marks having multi-pulses has a common parameter for 4 T or more marks.
- FIG. 15 is a diagram specifically showing, for each pattern, a calculation formula that satisfies the formula (2) in the patterns of all the front and back spaces related to the 2T mark, using the symbols of FIG.
- the 2T recording pulse forming the 2T mark is as shown in FIG.
- the top pulse fall time determined by 2T-dTtop 1106 and 2T-Top 1105 is the same as the rise time from cooling power Pc 1103 to erase power Pe 1102 determined by 2T-dTe 1107.
- the 2T recording pulse has no cooling pulse for emitting laser light with the cooling power Pc 1103, and recording using only the top pulse is performed. Also in the present embodiment, as in the first embodiment, the cooling pulse condition of the recording mark exceeding the optical resolution can be made different from that of the other recording marks, so that the same effect can be obtained.
- the classification of the recording pulse parameter to the recording mark is classified into 2T mark, 3T mark, 4T mark, 5T or more mark, but the present invention is not limited to this.
- classification may be further performed such as 2T mark, 3T mark, 4T mark, 5T mark, 6T or more mark, or 2T mark, 3T mark, 4T or more mark and classification may be reduced.
- the best effect as the recording performance can be obtained when the recording without the cooling pulse is uniformly performed.
- the classification of the recording pulse parameter with respect to the front and back spaces of the recording mark is classified as 2T space, 3T space, 4T space, 5T or more space, but the present invention is not limited thereto.
- the classification may be further classified as 2T space, 3T space, 4T space, 5T space, 6T or more space, or the classification may be reduced as 2T space, 3T space, 4T or more space.
- the 2T mark of the recording pulse parameter is classified by the combination of the front and back spaces, but the present invention is not limited to this.
- classification may be performed based on only the length of the space before dTtop or Ttop, or classification based on only the length of the space after dTe.
- RLL (1, 7) is used as the recording code, but the present invention is not limited to this.
- the shortest mark is not limited to 2T.
- the erasing power Pe is described as a rewritable information recording medium, but the present invention is not limited to this.
- the erase power Pe can be applied to the write-once information storage medium as the space power Ps.
- the recording pulse parameter is described in the information recording medium, but the present invention is not limited to this.
- it may be stored in the memory unit of the optical disk apparatus.
- the configuration of the optical disk apparatus according to the present embodiment is the same as the configuration of the optical disk apparatus 700 shown in FIG. Therefore, in describing the optical disk apparatus according to the present embodiment, reference will be continued to FIG.
- the optical disk apparatus according to the present embodiment is different from the optical disk apparatus 700 shown in FIG. 7 in part of its processing.
- the different processes will be described below.
- the description of the processing procedures applied similarly in the present embodiment will be omitted.
- the controller unit 707 passes the recording data and the recording pulse parameter to the recording pulse generation unit 704.
- This recording pulse parameter is recorded on the information recording medium 701.
- the recording pulse generation unit 704 generates a recording signal based on the received recording data and recording pulse parameters.
- the recording pulse generation unit 704 detects a flag in the recording pulse parameter, and when the flag is OFF, generates a recording signal according to the recording pulse parameter, and when the flag is ON, the recording data is generated. Is 2T and has a polarity for forming a recording mark, a 2T recording pulse as shown in FIG. 17 is generated.
- FIG. 17 will be described.
- the recording signal is generated such that the period defined by 2T-dTe 807 is not the cooling power Pc 803 but the erasing power Pe 802 from the falling time of the 2T top pulse.
- the recording pulse generation unit 704 passes the generated recording signal to the laser control unit 703.
- the laser control unit 703 that has received the generated recording signal controls light emission of the laser mounted on the optical head unit based on the recording signal, and forms a mark on the information recording medium 701. Data is recorded by this.
- the present invention has been described using the N / 2 type write strategy in FIG. 17, the present invention is not limited to the N / 2 type write strategy.
- the present invention can be applied to the N-1 type write strategy shown in FIGS. 11 and 12 and the write strategy called the castle type shown in FIGS. 13 and 14.
- FIG. 18 shows an information recording medium 1800 having three recording layers as an example of the information recording medium of the embodiment of the present invention.
- the L0 layer 1802 and the L2 layer 1803 are provided as the L0 layer 1801 is the recording layer farthest from the incident direction 1810 of the laser beam, and the L1 layer 1802 approaches the incident direction of the laser beam.
- FIG. 19 shows an area configuration on a plane of at least one recording layer of the information recording medium.
- An inner circumference area (Inner Zone) 1901, a data area (Data Zone) 1902, and an outer circumference area (Outer Zone) 1903 are arranged from the inner circumference side of the information recording medium.
- Disc management information called DI (Disc Information) is recorded in a disc management information area 1904 in the inner circumferential area 1901.
- the recording pulse parameters are included in this DI.
- Such disc management information is pre-recorded at the time of medium manufacture. For example, in the three-layer information recording medium shown in FIG. 18, the disc management information is recorded in at least the L0 layer 1801.
- the disc management information of all the recording layers from the L0 layer to the L2 layer can be read at once, and the start time can be shortened.
- the information recording medium of 3 layers was demonstrated here, it is not limited to this.
- the present invention can also be applied to an information recording medium of one or two layers or an information recording medium of four or more layers.
- an n-layer information recording medium (n is an integer of 1 or more) has n recording layers L0, L1,.
- Disc management information may be recorded in at least one of the n recording layers.
- the write strategy according to the embodiment of the present invention may be applied to any recording layer of the information recording medium.
- the write strategy according to the embodiment of the present invention satisfies the equations (2) and (3).
- the 2T recording pulse has a shape having no cooling power as shown in FIG. Because there is no cooling power, it is necessary to consider the heat dissipation characteristics of the recording layer in order to form the mark.
- heat dissipation characteristics for example, when applied to the L0 layer 1801 of the three-layer information recording medium shown in FIG. 18, there is no recording layer on the opposite side to the laser light incident side as viewed from the L0 layer. Therefore, it is possible to thicken the film that affects the heat radiation characteristics of the L0 layer without worrying about the transmission of light.
- the present invention is not limited to this, and the present invention can be applied to one-layer or two-layer information recording medium or four or more-layer information recording medium.
- classification of recording pulse parameters for recording marks is classified into 2T marks, 3T marks, even marks of 4T or more, and odd marks of 5T or more, but the present invention is not limited to this. .
- it may be classified as 2T mark, 3T mark, 4T mark, even mark of 6T or more, and odd mark of 5T or more.
- it may be classified into 2T mark, 3T mark, 4T mark, 5T mark, even mark of 6T or more, and odd mark of 7T or more.
- the present invention is not limited to the N / 2 type write strategy.
- the present invention can be applied to the N-1 type write strategy shown in FIGS. 11 and 12 and the write strategy called the castle type shown in FIGS. 13 and 14.
- the classification of the recording pulse parameter with respect to the front and back spaces of the recording mark is classified as 2T space, 3T space, 4T space, 5T or more space, but the present invention is not limited thereto.
- the classification may be further classified as 2T space, 3T space, 4T space, 5T space, 6T or more space, or the classification may be reduced as 2T space, 3T space, 4T or more space.
- the 2T mark of the recording pulse parameter is classified by the combination of the front and back spaces, but the present invention is not limited to this.
- classification may be performed based on only the length of the space before dTtop or Ttop, or classification based on only the length of the space after dTe.
- the present invention is particularly useful in the technical field of high density recording on an information recording medium. Further, according to the present invention, it is possible to perform recording with a higher SNR on a high density information recording medium and to reduce an error rate at the time of reproduction. Useful for realization.
- optical disk apparatus 701 information recording medium 702 optical head unit 703 laser control unit 704 recording pulse generation unit 705 reproduction signal processing unit 706 data processing unit 707 controller unit 708 memory unit
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- Optical Recording Or Reproduction (AREA)
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Abstract
Description
はじめに、第1の実施形態にかかる情報記録媒体に情報を記録する光ディスク装置を説明する。図7は、本実施形態による光ディスク装置700を示す図である。光ディスク装置700は、搭載された情報記録媒体701へ情報の記録を行う記録装置である。光ディスク装置700は、情報記録媒体701からの情報の再生も行ってもよい。情報記録媒体701は、書き換え型の記録媒体であり、本実施例では相変化型の書き換え可能な光ディスクを用いている。光ディスク装置700は、光ヘッド部702と、レーザ制御部703と、記録パルス生成部704と、再生信号処理部705と、データ処理部706と、コントローラ部707と、メモリ部708とを備える。
1T[ns] - Ttop[ns] + dTtop[ns] - dTe[ns] = 0[ns] ・・・(2)
なお、式(2)は、ns単位での計算である必要はなく、それぞれのパラメータが、例えば、Tをk(kは整数)等分した時間を1stepとして、パルス幅やパルス位置がstep数で表される場合は、
k[step] - Ttop[step] + dTtop[step] - dTe[step] = 0[step] ・・・(3)
としてもよい。
次に、本実施形態2にかかる光ディスク装置を説明する。
1T[ns] - Ttop[ns] + dTtop[ns] - dTe[ns] = 0[ns] ・・・(2)
次に、本実施形態3にかかる光ディスク装置を説明する。
次に、本実施形態にかかる情報記録媒体を説明する。
1T[ns] - Ttop[ns] + dTtop[ns] - dTe[ns] = 0[ns] ・・・(2)
なお、式(2)は、ns単位での計算である必要はなく、それぞれのパラメータが、例えば、Tをk(kは整数)等分した時間を1stepとして、パルス幅やパルス位置がstep数で表される場合は、
k[step] - Ttop[step] + dTtop[step] - dTe[step] = 0[step] ・・・(3)
としてもよい。
701 情報記録媒体
702 光ヘッド部
703 レーザ制御部
704 記録パルス生成部
705 再生信号処理部
706 データ処理部
707 コントローラ部
708 メモリ部
Claims (9)
- レーザ光をレンズで集光させてマークとスペースとを組み合わせたデータ列を情報記録媒体に記録する記録方法であって、
前記レーザ光の光学的な分解能の限界以上に短い長さのマークを形成するときのクーリングパルスの条件と、前記レーザ光の光学的な分解能の限界に達しない長さのマークを形成するときのクーリングパルスの条件とを異ならせる、記録方法。 - マークの長さをP、前記レーザ光の波長をλ、前記レンズの開口数をNAとしたとき、
前記レーザ光の光学的な分解能の限界以上に短い長さの前記マークは、P≦λ/4NAを満たすマークであり、
前記レーザ光の光学的な分解能の限界に達しない長さの前記マークは、P>λ/4NAを満たすマークである、請求項1に記載の記録方法。 - P≦λ/4NAを満たす前記マークを形成するときの前記クーリングパルスの幅をゼロに設定し、
P>λ/4NAを満たす前記マークを形成するときの前記クーリングパルスの幅をゼロ以外に設定する、請求項2に記載の記録方法。 - P≦λ/4NAを満たす前記マークを形成するときは、前記マークの前後のスペースの長さに関係なく前記クーリングパルスの幅をゼロに設定し、
P>λ/4NAを満たす前記マークを形成するときは、前記マークの前後のスペースの長さの少なくとも一方に応じて、前記クーリングパルスの幅をゼロ以外に設定する、請求項2に記載の記録方法。 - レーザ光を集光させるレンズを有する光ヘッド部と、記録用信号のパルス形状を制御する制御部とを備え、マークとスペースとを組み合わせたデータ列を情報記録媒体に記録する記録装置であって、
前記制御部は、前記レーザ光の光学的な分解能の限界以上に短い長さのマークを形成するときのクーリングパルスの条件と、前記レーザ光の光学的な分解能の限界に達しない長さのマークを形成するときのクーリングパルスの条件とを異ならせる、記録装置。 - マークの長さをP、前記レーザ光の波長をλ、前記レンズの開口数をNAとしたとき、
前記レーザ光の光学的な分解能の限界以上に短い長さの前記マークは、P≦λ/4NAを満たすマークであり、
前記レーザ光の光学的な分解能の限界に達しない長さの前記マークは、P>λ/4NAを満たすマークである、請求項5に記載の記録装置。 - 前記制御部は、
P≦λ/4NAを満たす前記マークを形成するときの前記クーリングパルスの幅をゼロに設定し、
P>λ/4NAを満たす前記マークを形成するときの前記クーリングパルスの幅をゼロ以外に設定する、請求項6に記載の記録装置。 - 前記制御部は、
P≦λ/4NAを満たす前記マークを形成するときは、前記マークの前後のスペースの長さに関係なく前記クーリングパルスの幅をゼロに設定し、
P>λ/4NAを満たす前記マークを形成するときは、前記マークの前後のスペースの長さの少なくとも一方に応じて、前記クーリングパルスの幅をゼロ以外に設定する、請求項6に記載の記録装置。 - レンズで集光されたレーザ光が照射されることにより、マークとスペースとを組み合わせたデータ列が記録される情報記録媒体であって、
前記レーザ光の光学的な分解能の限界以上に短い長さのマークを形成するときのクーリングパルスの条件と、前記レーザ光の光学的な分解能の限界に達しない長さのマークを形成するときのクーリングパルスの条件とを異ならせた記録条件が記録されたディスク情報領域を備えた、情報記録媒体。
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JP2005243234A (ja) * | 1998-07-23 | 2005-09-08 | Samsung Electronics Co Ltd | 高密度光記録機器のための適応的な記録方法 |
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JP2004134052A (ja) * | 2002-08-15 | 2004-04-30 | National Institute Of Advanced Industrial & Technology | 光記録再生装置、光記録再生方法及び光記録媒体 |
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