CN101477807A

CN101477807A - Optical data recording method

Info

Publication number: CN101477807A
Application number: CNA2009100099730A
Authority: CN
Inventors: 东海林卫; 小石健二; 中村敦史; 石田隆; 田坂修一
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 2002-10-10
Filing date: 2003-10-09
Publication date: 2009-07-08
Anticipated expiration: 2023-10-09
Also published as: CN101477809B; CN101477806A; CN1692410A; CN101477808A; CN101477809A; CN100474404C; CN101477806B; CN101477807B; CN101477808B

Abstract

The optical data recording method comprising the steps of: modulating data to be recorded, to generate a plurality of recording modulation codes; and emitting a pulse-like light beam to an optical disc, so that a plurality of recording marks and spaces which have lengths corresponding to the plurality of recording modulation codes are formed on the optical disc. In the optical data recording method, at least two of the plurality of recording marks comprises: a first pulse which is disposed at a front and forms a leading edge of the recording mark, a last pulse which is disposed at a backend and forms a trailing edge of the recording mark, and a multi-pulse train which is disposed between the first pulse and the last pulse and forms a center of the recording mark. The multi-pulse train has a pulse period longer than T which represents a reference period of the recording modulation code.

Description

Optical data recording method

The application is dividing an application of following application: international application no PCT/JP2003/013011, international filing date on October 9th, 2003; China national application number 200380100329.5 enters State Period date on September 9th, 2004.And therefore, the application requires following right of priority in first to file: the Japanese patent application 2002-297295 that on October 10th, 2002 submitted to; The Japanese patent application 2002-312432 that on October 28th, 2002 submitted to.

Technical field

The present invention relates to a kind of on the data storage medium such as CD method for recording data optically.

Background technology

As the medium that is used to write down a large amount of numerical datas, being used for optically, the data storage medium of record data receives publicity.

Phase change disc is one of recordable data carrier.Phase change disc has the recording film by heat fused.By with dish, on recording film, phase transformation occurred, and write down data by the part of light beam irradiates according to the light beam irradiates rotation of the semiconductor laser of the data-modulated that will write down.

Under the situation of strong beam, be heated to high temperature by the part of light beam irradiates on the recording film, cooled off rapidly then.Therefore become noncrystalline state by the part of light beam irradiates on the recording film.Under the situation of weak relatively light beam, be heated to moderate high temperature by the part of light beam irradiates, cooled off gradually then.So, become by the part of light beam irradiates and to be crystal state.Usually, the part that has become noncrystalline state is called as mark, and the part of crystallization is called as gap (space) between the mark.Utilize mark and gap to come the recording binary data.Mark and gap string are formed on the track that spiral is provided with on the CD.Usually, the laser power of strong beam is called as peak power, and the laser power of low light level bundle is called as bias power.

When the data of reading and recording to phase change disc, the low light level bundle that does not cause the phase transformation of recording film is transmitted into CD and detects reflected light.Usually, the mark that has become non-crystal state has antiradar reflectivity, and the gap of crystallization has high reflectance.Therefore, can detect the difference of reflection light quantity between mark and the gap,, with the reproducing signal binarization, then it be carried out demodulation, to obtain the data of record to produce reproducing signal.

As method at the phase change disc identifying recording layer, can usage flag location records and marker edge record.Usually, marker edge record (mark lengths record) can obtain higher information recording density.Compare with the mark position record, in the marker edge record, can write down longer mark.

When light beam with peak emission to phase change disc when writing down long mark because the heat built-up of recording film, the rear portion of mark has bigger width at radial direction.Therefore, occurred having kept not deleted data and the problem of signal cross-talk (crosstalk) between track, having occurred, and caused the signal quality severe exacerbation in direct rewriting period.

In order to address this problem, for example, the open No.9-7176 of Jap.P. has disclosed the mark that is formed by the marker edge record has been divided into the forward position, center section and edge, back.Forward position and back form along each single laser pulse by predetermined length, and center section is formed by a plurality of laser pulses that respectively have predetermined period.According to this method,, therefore, can suppress heat built-up and prevent to increase mark width because center section is formed by a plurality of laser pulses.On the other hand, because the forward position of mark and back can apply enough heats to recording film along being that laser pulse by predetermined length forms.Therefore, even under situation about directly rewriteeing, also can reduce the shake at edge of the mark of formation.

Fig. 1 and 2 has provided according to prior art, is used to form the example of laser pulse shape of the mark of all lengths.For example, according to the marker edge record, utilize record modulating-coding to write down the data that will write down according to the conversion of running length limited (2,10) modulation scheme.In this case, the record modulating-coding occurs to extreme length 11T with shortest length 3T, and wherein T represents the reference cycle of the record modulating-coding of record mark.The mark and the gap that are recorded in its enterprising line item according to marker edge have the continuous length of representing with the length of record modulating-coding.

When on CD, forming these marks, as mentioned above, in having each mark of length separately, adopt a plurality of laser pulses as shown in Figure 2.Fig. 6 has provided the recording impulse string that produces the laser pulse that is used to form the 6T mark.In Fig. 1, be called as first pulse in the pulse 801 of front end, the pulse 804 in the rear end is called as final pulse.In addition, pulse between first pulse and the final pulse 802 and pulse 803 are called as the multi-pulse train that the pulse by period T constitutes.

The multi-pulse train of mark 6T comprises two pulses, and the multi-pulse train of mark 7T comprises three pulses.In addition, the multi-pulse train of mark 5T is actually and is made of individual pulse.Along with mark lengths increases T, the quantity of pulse increases by 1.On the contrary, along with mark lengths reduces T, reduce by a pulse.Therefore, mark 4T only is made of first pulse and final pulse, does not have the intermediate pulse string.In addition, mark 3T is made of individual pulse.Usually, first pulse has 0.25 to 1.5T width, and final pulse has 0.25 to 1T width.The individual pulse that constitutes multi-pulse train has 0.25 to 0.75T width.

In laser pulse shape shown in Figure 2, though the waveform of the width of final pulse and laser pulse shown in Figure 1 is different, mark lengths and form laser pulse identical of relation and Fig. 1 between the quantity of multi-pulse train of center section.

When forming mark, can form the mark of different length at an easy rate by the number of pulses that changes center section according to said method.Yet, according to this conventional method, when the speed of record data increases, for example, when with high transmission speed with data recording to CD the time because the response speed of laser diode does not reach ideal height, the rising edge and the negative edge of pulse die down in luminescent waveform.Therefore, predetermined heat can not be applied to the recording film of CD.Particularly, because multi-pulse train has for example about pulse width of 0.25 to 0.75T, in some rise time of laser instrument and fall time, become and be difficult to produce sinusoidal wave pulse.Therefore, can not form correct mark.

Summary of the invention

An object of the present invention is to solve above-mentioned general issues, and provide a kind of can correctly write down be used for method for recording data optically.

The data record method of this optics comprises step: the data that modulation will be write down, to produce a plurality of record modulation codes; With to CD transponder pulse class light beam, so that on CD, form a plurality of record marks and the gap have with the corresponding length of these a plurality of record modulation codes.In the data record method of this optics, at least two in these a plurality of record marks comprise: be arranged on front end and form first pulse in the forward position of record mark, be arranged on the rear end and form the final pulse on the back edge of record mark, and be arranged between first pulse and the final pulse and form the multi-pulse train at the middle part of record mark.This multi-pulse train has the longer recurrence interval of T than the reference cycle of representative record modulation code.

In one embodiment of the invention, these a plurality of record marks have the different length of representing with nT (n is equal to or greater than 1 integer), and have the number of pulses that at least two record marks of different n comprise equate in the recording impulse string.

In one embodiment of the invention, by first pulse, the irradiation power of the light beam of at least one generation in multi-pulse train and the final pulse at least two record marks is changed.

In one embodiment of the invention, record mark 2nT and (2n+1) each the recording impulse string among the T in a plurality of record marks, comprise equal number of pulses.

In one embodiment of the invention, each the recording impulse string among record mark (2n-1) T and the 2nT comprises equal number of pulses in a plurality of record marks.

In one embodiment of the invention, each first pulse has equal pulse width in a plurality of record marks.

In one embodiment of the invention, each final pulse has equal pulse width in a plurality of record marks.

In one embodiment of the invention, each in the multi-pulse train has equal pulse width and recurrent interval in a plurality of record marks.

In one embodiment of the invention, these a plurality of record marks comprise the record mark that forms by according to the recording impulse string emitted light beams that only comprises a pulse, with had pulse width by the record mark that forms according to the recording impulse string emitted light beams that only comprises first pulse and final pulse and this recording impulse string respectively is 1T or bigger pulse.

In one embodiment of the invention, these a plurality of record marks comprise the record mark that forms by according to the recording impulse string emitted light beams that only comprises a pulse, respectively be 1T or bigger two adjacent pulses at interval with having by the record mark that forms according to the recording impulse string emitted light beams that only comprises first pulse and final pulse and this recording impulse string.

In one embodiment of the invention, in the recording impulse string, setting has the multiple-pulse district of the multi-pulse train that is arranged on wherein, the amplitude of at least one recording impulse string and position, so that multiple-pulse dutycycle (duty) or multiple-pulse amplitude mean value are arranged on predetermined value, by the pulse width of multi-pulse train is obtained the multiple-pulse dutycycle divided by cycle of multi-pulse train, by the amplitude integer division in multiple-pulse district is obtained multiple-pulse amplitude mean value with the time width in multiple-pulse district.

In one embodiment of the invention, multi-pulse train has the cycle that is set to 2T.

In one embodiment of the invention, the decline that is timed to the rear end pulse of multi-pulse train by the rising of the front end pulse of multi-pulse train regularly defines this multiple-pulse district.

In one embodiment of the invention, the rising that is timed to final pulse by the decline of first pulse regularly defines this multiple-pulse district.

In one embodiment of the invention, this method be provided with this recording impulse string the front end pulse rising regularly and the pulse width of each pulse of this recording impulse string.

In one embodiment of the invention, be provided with, so that the rear end pulse of front end gap width between the front end pulse of first pulse and this train of impulses and multi-pulse train and the rear end gap width between the final pulse almost are equal to each other

In one embodiment of the invention, a plurality of record modulation codes have the different length by nT (n is equal to or greater than 1 integer) expression, the amplitude and the position of at least one pulse of set recording impulse string are constant values, and irrelevant with the length of record modulation code.

In one embodiment of the invention, a plurality of record modulation codes have the different length by nT (n is equal to or greater than 1 integer) expression, and are the odd-multiple of size of T or even-multiple is provided with at least one pulse of recording impulse string with different values the amplitude that is provided with and position according to the length of record modulation code.

In one embodiment of the invention, a plurality of record modulation codes have the different length by nT (n is equal to or greater than 1 integer) expression, and, the amplitude that is provided with and the position of at least one pulse of recording impulse string is set with different values according to the length that writes down modulation code.

In one embodiment of the invention, a plurality of record modulation codes have the different length by nT (n is equal to or greater than 1 integer) expression, should be categorized into a plurality of code-group by a plurality of record modulation codes, and the amplitude that is provided with and the position of at least one pulse of recording impulse string were set with different values at each code-group.

In one embodiment of the invention, a plurality of record modulation codes have the different length by nT (n is equal to or greater than 1 integer) expression, and multiple-pulse dutycycle or multiple-pulse amplitude mean value is set to constant value, and irrelevant with length of this record modulation code.

In one embodiment of the invention, a plurality of record modulation codes have the different length by nT (n is equal to or greater than 1 integer) expression, and according to the record modulation code length be the odd-multiple or the even-multiple of the size of T, multiple-pulse dutycycle or multiple-pulse amplitude mean value are set to different values.

In one embodiment of the invention, a plurality of record modulation codes have the different length by nT (n is equal to or greater than 1 integer) expression, and according to the length that writes down modulation code, multiple-pulse dutycycle or multiple-pulse amplitude mean value are set to different values.

In one embodiment of the invention, a plurality of record modulation codes have the different length by nT (n is equal to or greater than 1 integer) expression, should be categorized into a plurality of code-group by a plurality of record modulation codes, and be set to different values at each code-group multiple-pulse dutycycle or multiple-pulse amplitude mean value.

In one embodiment of the invention, form record mark, and estimation is determined multiple-pulse dutycycle or multiple-pulse amplitude mean value by the pericentral range value of the reproducing signal of the record mark acquisition of reproduction formation by the service recorder train of impulses.

According to another aspect of the present invention, a kind of data recording equipment comprises: place CD thereon and make the CD motor rotating; Have light source and on the CD of placing on the motor emission light beam shaven head; The data that modulation will be write down also produce the signal processing of a plurality of record modulation codes; Produce a plurality of recording impulse strings that are used for driving light source according to the record modulation code, produce part so that on CD, form to have with the corresponding recording impulse string that writes down a plurality of record marks of the corresponding length of modulation code.At least two marks in these a plurality of record marks are by forming according to recording impulse string emitted light beams, this recording impulse string comprises: be arranged on front end and form first pulse in the forward position of record mark, be arranged on the rear end and form the final pulse on the back edge of record mark, and be arranged between first pulse and the final pulse and form the multi-pulse train at the middle part of record mark.This multi-pulse train has the longer recurrence interval of T than the reference cycle of representative record modulation code.

In one embodiment of the invention, by first pulse, the irradiation power of light beam at least two record marks of at least one generation in multi-pulse train and the final pulse string is changed.

In one embodiment of the invention, in the recording impulse string, setting has the multiple-pulse district of the multi-pulse train that is arranged on wherein, the amplitude of at least one recording impulse string and position, so that multiple-pulse dutycycle or multiple-pulse amplitude mean value are arranged on predetermined value, by the pulse width of multi-pulse train is obtained the multiple-pulse dutycycle divided by cycle of multi-pulse train, by the amplitude integer division in multiple-pulse district is obtained multiple-pulse amplitude mean value with the time width in multiple-pulse district.

In one embodiment of the invention, multi-pulse train has the cycle that is arranged on 2T.

Description of drawings

Fig. 1 is the synoptic diagram of an example of the conventional recording impulse string of expression.

Fig. 2 is the synoptic diagram of another example of the conventional recording impulse string of expression.

Fig. 3 is the block scheme of expression according to the embodiment 1 of recording unit of the present invention.

Fig. 4 is the synoptic diagram of the structure of the Beam Control part in the recording unit of presentation graphs 3.

Fig. 5 is that expression is input to the signal of Beam Control part and the synoptic diagram of the signal partly exported from Beam Control.

Fig. 6 is the synoptic diagram of expression according to the example 1 of the recording impulse string of embodiment 1.

Fig. 7 is the synoptic diagram of expression according to the example 2 of the recording impulse string of embodiment 1.

Fig. 8 is the synoptic diagram of expression according to the example 3 of the recording impulse string of embodiment 1.

Fig. 9 is the synoptic diagram of expression according to the example 4 of the recording impulse string of embodiment 1.

Figure 10 is the synoptic diagram of expression according to the example 5 of the recording impulse string of embodiment 1.

Figure 11 is the synoptic diagram of expression according to the example 6 of the recording impulse string of embodiment 1.

Figure 12 is the synoptic diagram of expression according to a variation of the example 1 of the recording impulse string of embodiment 1.

Figure 13 is the synoptic diagram of expression according to a variation of the example 2 of the recording impulse string of embodiment 1.

Figure 14 is the synoptic diagram of expression according to a variation of the example 3 of the recording impulse string of embodiment 1.

Figure 15 is the synoptic diagram of expression according to a variation of the example 4 of the recording impulse string of embodiment 1.

Figure 16 is the synoptic diagram of expression according to a variation of the example 5 of the recording impulse string of embodiment 1.

Figure 17 is the synoptic diagram of expression according to a variation of the example 6 of the recording impulse string of embodiment 1.

Figure 18 A and 18B show the record mark that is formed by conventional recording impulse string, and recording impulse string and by reproducing the waveform of the reproducing signal that record mark obtains.

Figure 19 shows the recording impulse string according to embodiment 2, the record mark that is formed by this recording impulse string and by reproducing the waveform of the reproducing signal that this record mark obtains.

Figure 20 is the synoptic diagram of the parameter of the expression recording impulse string that is used for determining embodiment 2.

Figure 21 is the synoptic diagram of expression according to the example 1 of the recording impulse string of embodiment 2.

Figure 22 is the synoptic diagram of expression according to the example 2 of the recording impulse string of embodiment 2.

Figure 23 is the synoptic diagram of expression according to the example 3 of the recording impulse string of embodiment 2.

Figure 24 is that decision is used for determining the synoptic diagram of the method for estimation of the desired value that parameter is whether suitable according to embodiment 2 in explanation.

Embodiment

(embodiment 1)

Fig. 3 is the block scheme of expression according to the embodiment 1 of data recording equipment of the present invention.As shown in Figure 3, data recording equipment 100 comprises spindle motor 102, shaven head 103, and Beam Control part 104, servo segment 105 reproduces binarization part 106, digital signal processing part 107, record compensated part 108 and CPU 109.Beam Control part 104 and record compensated part 108 form the recording impulse string and produce part.

CD 101 is placed on the spindle motor 102, spindle motor 102 rotating discs 101.CD 101 has one or more tracks that are used for record data.Track in the shape of a spiral or circular concentric.CD 101 has the recording film that melts by heating.When emission during according to the light beam of the semiconductor laser of the data-modulated that will write down, on recording film by light beam irradiates part phase transformation appears.

Shaven head 103 laser diodes that have as light source, this light source are used for the light beam of record data to CD 101 irradiations.In addition, shaven head 103 will convert electric signal to from the light of CD 101 reflections, and will output to reproduction binarization part 106 as reproducing signal through the signal of conversion.

Beam Control part 104 produces the electric current of the laser diode that is used to drive shaven head 103 and according to the instruction control of CPU 109 power from the light beam of laser diode output.

The position of servo segment 105 control shaven heads 103, and to carrying out focus control and tracking Control from bare headed 103 emitted light beams.In addition, the rotation of servo segment 105 control spindle motors 102.Reproduce binarization part 106 and amplify the reproducing signal that obtains from shaven head 103, and signal is carried out binarization to produce the binarization signal.In addition, binarization part 106 is utilized inner PLL (not shown), produces clock with binarization signal Synchronization ground.

107 pairs of binarization signals of digital signal processing part are scheduled to separates the mediation error correction.When record data, digital signal processing part 107 is added to the data of record with error correcting code, and the modulation of being scheduled to is to produce modulating data.Record compensated part 108 converts modulating data to constitute train of impulses optical modulation data, the information of obtaining according to the reproducing signal from the dish block of information and be stored in CPU

Information in 109 is regulated the pulse width of optical modulation data etc., carries out the conversion to the signal of the recording impulse string of the form that is suitable for mark, and exports this signal.The whole data recording equipment 100 of CPU 109 controls.

Host PC 110 is by the computing machine (not shown), and application program (not shown) and operating system (not shown) constitute, and request msg recording unit 100 executive loggings and reproduction.When CD 101 is loaded in the data recording equipment 100, data recording equipment 100 has the light beam of predetermined irradiation power from shaven head 103 outputs, and control bundle control section 104 and servo segment 105, so that the dish block of information of CD 101 the inner ring setting of dish (usually around) reproduced.Thereby obtain irradiation power information that is used to write down etc.

Below with reference to Fig. 3 to 5, recording operation is discussed.Fig. 4 shows the concrete structure of Beam Control part 104.

Beam Control part 104 produces the electric current of the laser diode 103a that is used to drive shaven head 103.Therefore, Beam Control part 104 comprises and is used to make laser diode 103a emission to have the current source 122 of the light of bias power, is used to make diode 103a emission to have current source 121 and switch 123,124 and 125 of the light of peak power.Current source 121 and current source 122 are in parallel with laser diode 103a, switch 123,124, and 125 parallel connections are inserted between current source 121 and the laser diode 103a.

As shown in Figure 3, during writing down, digital signal processing part 107 is added to the data that will write down with error correcting code, and carries out predetermined modulation comprises recording modulation codes with generation modulating data.Record compensated part 108 receives modulating data and this data-switching is become the optical modulation data.The optical modulation data constitute so that form the recording impulse string of record mark and record gap on CD by being used to produce the driving pulse electric current that will be applied to laser diode.Record mark and record gap are corresponding to the recording modulation codes that comprises in the modulating data.At this moment, record compensated part 108 according to the information of obtaining by the dish block of information of reproducing CD and the information among the CPU 109 of being stored in to the pulse width in the recording impulse string with regularly carry out accurate adjustment and save, record compensated part 108 is regulated the recording impulse string according to the kind and the writing speed of CD, so that have only pulse waveform.

Fig. 5 has schematically provided the optical modulation data that produced by record compensated part 108.The recording impulse string 130 that is used to form single record mark comprises the front end that is arranged on recording impulse string 130 and forms first pulse 131 in the forward position of record mark, be arranged on the rear end of recording impulse string 130 and form the final pulse 132 on the back edge of record mark, and be arranged between first pulse 131 and the final pulse 132 and form the multi-pulse train 133 of the center section of record mark.In Fig. 5, though multi-pulse train 133 includes only a pulse, multi-pulse train 133 can comprise two or more pulses according to the length of record mark.In addition, according to the length of record mark, can not comprise multi-pulse train 133 in the recording impulse 130, and can only comprise first pulse 131 and final pulse 132.As an alternative, the mark with shortest length can comprise the pulse with a length, and this length is different with the mark with another length.

Record compensated part 108 produces first pulse 131 that includes only recording impulse string 130 respectively, the signal 111,112 and 113 of multi-pulse train 133 and final pulse 132.Record compensated part 108 outputs to these signals respectively the switch 123,124 and 125 of light beam drive part 104.First pulse 131 that comprises in the signal 111,112 and 113, multi-pulse train 133 and final pulse 132 each quilt are at predetermined time-shifting.

The switch 123,124 of signal 111,112 and 113 and 125 entering signals are set at high level during it cycle ON have been received.Therefore, produce have with the similar waveform of the waveform of train of impulses 130 and have peak power and bias power as high level and low level recording impulse string (driving pulse string).By driving pulse string driving laser diode 103a, and being radiated at of laser diode of response forms record mark on the CD.

The recording impulse string that is used to form record mark according to present embodiment is described below.In the specific embodiment, for example, utilize stroke limited (2,10) modulation scheme to modulate record data below, and write down label record on CD according to marker edge.In this modulation scheme, use mark and gap from 3T to 11T, wherein T represents reference clock cycle.

Fig. 6 shows the recording impulse string according to the example 1 of present embodiment.Fig. 6 begins to show the recording impulse string that forms record mark 3T to 11T from above.

As shown in Figure 6, for example, the recording impulse string that is used to form record mark 6T comprises first pulse 201 that is arranged on front end, is arranged on the final pulse 203 of rear end, and is arranged on the multi-pulse train 202 between first pulse 201 and the final pulse 203.

In addition, the recording impulse string that is used to form record mark 7T comprises first pulse 204 that is arranged on front end, is arranged on the final pulse 206 of rear end, and is arranged on the multi-pulse train 205 between first pulse 204 and the final pulse 206.

In these recording impulse strings, multi-pulse train 202 and 205 respectively is made of single pulse.In addition, in

recording impulse string

8T and 9T, multi-pulse train 207 and 209 respectively comprises two pulses.In

recording impulse string

10T and 11T, multi-pulse train 209 and 210 respectively comprises three pulses.

Like this, in the recording impulse string of present embodiment, forming 2nT and (2n+1) in the recording impulse string of T record mark, wherein n represents to be equal to or greater than 2 integer, each multi-pulse train comprises the pulse of equal amount.

Therefore, the length along with mark increases 2T, the quantity of pulse increase by 1 in the multi-pulse train.At this moment, produce multiple-pulse two kinds of timings.Even under the situation of two record marks that comprise multi-pulse train, each record mark has equal number of pulses, the front end pulse 0.5T of the multi-pulse train of the mark of the reference cycle T of the front end pulse advance odd-numbered of the multi-pulse train of the mark of the reference cycle T of even-numbered.In other words, the interval between the front end pulse of first pulse and multi-pulse train is at the short-and-medium 0.5T of the mark T of even-numbered.In addition, the rear end pulse of multi-pulse train and the interval between the final pulse are at the short-and-medium 0.5T of the mark T of even-numbered.

As shown in Figure 6, in the recording impulse string that forms record mark 3T to 11T, first pulse, the pulse width of the pulse in final pulse and the multi-pulse train is almost equal, and pulse width equals reference cycle T.The recurrent interval of multi-pulse train also equals reference cycle T.In other words, the recurrence interval of multi-pulse train is 2T, and its size is the twice of reference cycle T.

In addition, as shown in Figure 6, each the recording impulse string that forms

mark

4T and 5T only is made of first pulse and final pulse, does not comprise the multi-pulse train in the example 1.The recording impulse string that forms mark 3T is made of single pulse.Therefore, consider the combination of first pulse and final pulse, under the situation of the recording impulse of example 1, forming 2nT and (2n+1) comprising the pulse of equal amount in each recording impulse of T record mark that wherein n is equal to or greater than 2 integer.

When forming record mark with such recording impulse string, the pulse width of the pulse of formation multi-pulse train is reference cycle T no better than.This pulse width is similar to the twice of the pulse width that constitutes conventional multi-pulse train.Can reduce the rise time of laser in the pulse and the influence of fall time relatively, to stop the record mark distortion.In addition, because the width of first pulse in each mark and final pulse is equal, can be convenient to write down exactly the marginal position of each mark.Particularly change when the marginal position of mark, and when with high transfer rate data recording having been increased the shake of reproducing signal to CD, the recording impulse string of example 1 is effective.

Fig. 7 shows the recording impulse string according to the example 2 of present embodiment.Compare with the example 1 of Fig. 6, in the recording impulse string that forms record mark 3T to 11T, the pulse of equal amount has constituted 2nT and (2n+1) multi-pulse train in each mark in the T mark.In addition, the length along with mark increases 2T, the quantity of pulse increase by 1 in the multi-pulse train.

In addition, each the recording impulse string that forms record mark 6T to 11T is by first pulse, and multi-pulse train and final pulse constitute.For example, the recording impulse string that forms record mark 6T comprises first pulse 301 that is arranged on front end, is arranged on the final pulse 303 of rear end, and is arranged on the multi-pulse train 302 between first pulse 301 and the final pulse 303.The recording impulse string that forms record mark 7T comprises first pulse 304 that is arranged on front end, is arranged on the final pulse 306 of rear end, and is arranged on the multi-pulse train 305 between first pulse 304 and the final pulse 306.The recording impulse string that forms mark 3T includes only first pulse.The recording impulse string that forms

mark

4T and 5T respectively only is made of first pulse and final pulse.

As shown in Figure 7, about forming the recording impulse of record mark, for first pulse, the pulse of final pulse and multi-pulse train is provided with equal interval between adjacent pulse.At T is in the recording impulse string of even-numbered, and the width of first pulse and final pulse is different with the width of other pulse.For example, width is 1.5T.T is that first pulse in the recording impulse string of odd-numbered and the width of final pulse approximately are 1T, and the width of pulse that constitutes the multi-pulse train of all record marks approximately is 1T.

According to the recording impulse string of example 2, the interval between two adjacent pulses is almost equal in each recording impulse string.Therefore, each record mark of the recording impulse string of use-case 2 formation has almost equal width at the radial direction of CD.Therefore, by suitably selecting the peak power of laser diode, can reduce the shake that the cross erasing that obtains as crosstalking of revealing from the reproducing signal of adjacent track and the record from adjacent track causes.

Fig. 8 illustrates the recording impulse string according to the example 3 of present embodiment, compares with the example 1 among Fig. 6, and in the recording impulse string that forms record mark 3T to 11T, the pulse of equal amount has constituted 2nT and (2n+1) multi-pulse train in each mark in the T mark.In addition, the length along with mark increases 2T.The quantity of pulse increases by 1 in the multi-pulse train.

In addition, each the recording impulse string that forms record mark 6T to 11T is by first pulse, and multi-pulse train and final pulse constitute.For example, the recording impulse string that forms record mark 6T comprises first pulse 401 that is arranged on front end, is arranged on the final pulse 403 of rear end, and is arranged on the multi-pulse train 402 between first pulse 401 and the final pulse 403.The recording impulse string that forms record mark 7T comprises first pulse 404 that is arranged on front end, is arranged on the final pulse 406 of rear end, and is arranged on the multi-pulse train 405 between first pulse 404 and the final pulse 406.The recording impulse string that forms mark 3T includes only first pulse.The recording impulse string that forms

mark

4T and 5T respectively only is made of first pulse and final pulse.

Under the situation of the recording impulse string of example 3, the width of first pulse of multi-pulse train and T are that other pulse in the recording impulse string of mark of odd-numbered is different.For example, width is about 1.5T.First pulse, the width of final pulse and other pulse except that the front end pulse of multi-pulse train is almost equal in institute is underlined.Width approximately is 1T.For the width between the adjacent pulse, the rear end pulse of multi-pulse train and the interval between the final pulse are the interval between any other adjacent pulse in the mark of odd-numbered greater than T.For example, the rear end pulse of multi-pulse train and the interval between the final pulse approximately are 1.5T, and between any other adjacent pulse are about 1.5T at interval.

In addition,, replace the front end pulse of multi-pulse train when laser power is the rear end of mark of odd-numbered when not enough at T, can be bigger at the width of the pulse of rear end than the width of other pulse.In addition, the interval between the front end pulse of first pulse and multi-pulse train can be bigger than the interval between other interval.

The recording impulse string of example 3 be characterised in that with example 1 and example 2 the two the recording impulse string be characterized as feature.In the marginal position of record mark, occur to change, reproducing signal crosstalk and write down during the situation about having a strong impact on of cross erasing under, the recording impulse string formation record mark by use-case 3 can reduce this influence.

Fig. 9 shows the recording impulse string according to the example 4 of present embodiment.For above-described example, for example, the recording impulse string that forms record mark 7T comprises first pulse 501 that is arranged on front end, is arranged on the final pulse 503 of rear end, and is arranged on the multi-pulse train between first pulse 501 and the final pulse 503.The recording impulse string that forms record mark 8T comprises first pulse 504 that is arranged on front end, is arranged on the final pulse 506 of rear end, and is arranged on the multi-pulse train 505 between first pulse 504 and the final pulse 506.

In these recording impulse strings,

multi-pulse train

502 and 505 respectively is made of individual pulse.In addition, in

recording impulse string

9T and 10T,

multi-pulse train

507 and 508 respectively comprises two pulses.In recording impulse string 11T, multi-pulse train 509 comprises three pulses.

Like this, according to the recording impulse string of example 4, each in the multi-pulse train comprises the pulse of equal amount in the recording impulse string that forms record mark (2n-1) T and 2nT, and wherein n represents to be equal to or greater than 4 integer.

Therefore, the length along with mark increases 2T, the number of pulses increase by 1 in the multi-pulse train.At this moment, produce multiple-pulse two types timing.Even under the situation of two record marks that comprise multi-pulse train, each mark respectively has the pulse of equal amount, and T is that the front end pulse advance T of multi-pulse train of mark in the reference cycle of odd-numbered is the front end pulse 0.5T of multi-pulse train of mark in the reference cycle of even-numbered.In other words, be in the mark of even-numbered at T, the short 0.5T in the interval between the front end pulse of first pulse and multi-pulse train.In addition, be in the mark of odd-numbered at T, the short 0.5T in the rear end pulse of multi-pulse train and the interval between the final pulse.

As shown in Figure 9, in the recording impulse string that forms record mark 3T to 11T, first pulse, the pulse width of the pulse of final pulse and multi-pulse train is almost equal, and this pulse width equals reference cycle T.The recurrent interval of multi-pulse train also equals reference frequency T.In other words, the recurrence interval of multi-pulse train is 2T, is the twice of the size of reference pulse T.

In addition, in example 4, each the recording impulse string that forms

mark

5T and 6T only is made of first pulse and final pulse, and does not comprise multi-pulse train.The recording impulse string that forms 3T and 4T respectively is made of individual pulse.Yet the recording impulse string of 4T uses first pulse than the long 0.5T of 3T.Therefore, consider the combination of first pulse and final pulse, under the situation of the recording impulse of example 4, in each the recording impulse string that forms record mark (2n-1) T and 2nT record mark, comprise the pulse of equal amount, wherein n represents to be equal to or greater than 1 integer.

When forming record mark with this recording impulse string, the pulse width of the pulse of formation multi-pulse train is reference cycle T no better than.This pulse width is the twice of pulse width that constitutes the pulse of conventional multi-pulse train.Can reduce the influence of the rise time and the fall time of laser in the pulse relatively, so that prevent the record mark distortion.In addition, because first pulse and the width of final pulse in each mark equate, the marginal position of each mark of accurate recording at an easy rate.Particularly be changed and when with high transfer rate data recording being increased the shake of reproducing signal to CD, the recording impulse string of example 4 is effective when the marginal position of mark.

Figure 10 illustrates the recording impulse string according to the example 5 of present embodiment.Compare with the example 4 of Fig. 9, in the recording impulse string that forms record mark 3T to 11T, the multi-pulse train in each mark of the pulse of equal amount formation (2n-1) T to 2nT mark.In addition, the length along with mark increases 2T, the number of pulses increase by 1 in the multi-pulse train.

In addition, each the recording impulse string that forms record mark 7T to 11T is by first pulse, and multi-pulse train and final pulse string constitute.For example, the recording impulse string that forms record mark 7T comprises first mark 601 that is arranged on front end, is arranged on the last mark 603 of rear end, and is arranged on the multi-pulse train 602 between first pulse 601 and the final pulse 603.The recording impulse string that forms record mark 8T comprises first mark 604 that is arranged on front end, is arranged on the last mark 606 of rear end, and is arranged on the multi-pulse train 605 between first pulse 604 and the final pulse 606.The recording impulse string of 3T and 4T includes only first pulse.Each is made of the recording impulse string of 5T and 6T first pulse and final pulse.

As shown in figure 10, forming about first pulse, in the recording impulse of each record mark of the pulse of final pulse and multi-pulse train, the interval between the adjacent pulse is almost equal.At T is in the recording impulse string of even-numbered, and the width of first pulse and final pulse is different with the width of other pulse.For example, width approximately is 1.5T.T is that first pulse in the recording impulse string of odd-numbered and the width of final pulse are about 1T, and the width of pulse that constitutes the multi-pulse train of all record marks is about 1T.

According to the recording impulse string of example 5, in each recording impulse string, the interval between two adjacent pulses is almost equal.Therefore, each record mark of the recording impulse string of use-case 5 formation has almost equal width at the radial direction of CD.Therefore, by suitably selecting the peak power of laser diode, can reduce as leak the shake that cross erasing that crosstalking of causing and the record from adjacent track obtain causes from the reproducing signal of adjacent track.

Figure 11 shows the recording impulse string according to the example 6 of present embodiment.For the example 4 of Fig. 9, the multi-pulse train in (2n-1) T in the recording impulse string of the pulse of equal amount formation formation record mark 3T to 11T and each of 2nT mark.In addition, the length along with this mark increases 2T, the number of pulses increase by 1 in the multi-pulse train.

In addition, each the recording impulse string that forms record mark 7T to 11T is by first pulse, and multi-pulse train and final pulse string constitute.For example, the recording impulse string that forms record mark 7T comprises first mark 701 that is arranged on front end, is arranged on the last mark 703 of rear end, and is arranged on the multi-pulse train 702 between first pulse 701 and the final pulse 703.The recording impulse string that forms record mark 8T comprises first mark 704 that is arranged on front end, is arranged on the last mark 706 of rear end, and is arranged on the multi-pulse train 705 between first pulse 704 and the final pulse 706.The recording impulse string of 3T and 4T includes only first pulse.Each is made of the recording impulse string of 7T and 6T first pulse and final pulse.

In the recording impulse string of example 6, the width of the front end pulse of multi-pulse train and T are that the width of other pulse in the recording impulse string of mark of even-numbered is different.For example, this width approximately is 1.5T.First pulse, final pulse and the pulse except that the front end pulse of multi-pulse train the width in underlined almost equal.This width is about 1T.For the width between the adjacent pulse, the rear end pulse of multi-pulse train and the interval between the final pulse are that the interval between any other adjacent pulse is big in the mark of odd-numbered than T.For example, the rear end pulse of multi-pulse train and the interval between the final pulse are about 1.5T, and the interval between any other adjacent pulse is about 1T.

In addition, when laser power is the rear end of mark of odd-numbered when not enough at T, be not the front end pulse of multi-pulse train, but the width of rear end pulse can be bigger than the width of other pulse.In addition, the interval between the front end pulse of first pulse and multi-pulse train can be bigger than the interval between other interval.

The recording impulse string of example 6 is characterised in that the two the feature of recording impulse string of example 1 and example 2.Change at the marginal position of record mark, the crosstalking of reproducing signal, under the situation that cross erasing etc. has a strong impact on during the record, the recording impulse string by use-case 6 forms record mark and can reduce influence.

Like this, according to present embodiment, the cycle of pulse is set to 2T in the multi-pulse train, greater than the reference cycle T of recording modulation codes.Therefore, even under the situation that improves writing speed, can reduce the influence of the rise time and the fall time of laser, realize correct record.

In addition, in above-mentioned example, the scale-of-two power that utilizes peak power and bias power is at CD 101 enterprising line items.The kind of power is not limited thereto, and can adopt three kinds or multiple power to be used for record.

The difference of the recording impulse string of the example 7 among Figure 12 and the recording impulse string of the example 1 among Fig. 6 is that the T except that 3T is that the amplitude of first pulse of odd-numbered and final pulse is bigger, in other words, the laser radiation power corresponding with high level is greater than the laser radiation power of other pulse.

As shown in figure 12, comprise the pulse of equal amount in each of recording impulse string 2nT and recording impulse string (2n+1) T, wherein n represents to be equal to or greater than 2 integer.Record mark (2n+1) T need form longlyer than record mark 2nT.Therefore, when forming record mark (2n+1) T, compare, add heat and can become not enough with the formation of record mark 2nT.For this reason, make other pulse of laser radiation power ratio of first pulse and final pulse big.For example, the laser power of first pulse and final pulse is arranged on high-power power than other pulse, and is set to 1.5 times of power of other pulse or littler.In order to produce such recording impulse string, for example, control section 104 can comprise big another current source and a pair of interconnective switch of output current than current source 121, to form the current source and the switch of series connection.In addition, can regulate record compensated part 108,, produce and make switch being in the control signal of ON state so that have in generation under the situation of recording impulse string of record mark 5T or bigger even-numbered.

By the pulse of the mark of 2T provides equal power in order to constitute separately, in the process that produces the recording impulse string, can utilize this regularity.Therefore, compare with the situation of each mark of separate compensation, can simplify the structure of control section 104 and record compensated part 108 with producing each recording impulse string.

Utilize these structures, can prevent between the front end pulse of not enough laser radiation power reduction first pulse and multi-pulse train and the rear end pulse of multi-pulse train and the width of the record mark between the final pulse, the interval of pulse-to-space ratio recording impulse string 2nT is long.Therefore, can form record mark with correct mark width.

Not the laser radiation power that increases the final pulse of recording impulse string (2n+1) T, but the laser radiation power of the rear end pulse of the multi-pulse train among recording impulse string (2n+1) T that can increase.In addition, the laser radiation power of recording impulse string 3T and recording impulse string 4T can differ from one another.

Equally, still in the recording impulse string of example 2 to 6, by proofreading and correct the irradiation power of predetermined pulse, can compensate because of equilibrium writing train of impulses 2nT and (2n+1) the laser radiation underpower that causes of the number of pulses among T or recording impulse string (2n-1) T and the 2nT.

Figure 13 illustrates the variation instance according to the recording impulse string of example 2.Make first pulse among the recording impulse string 2nT and the amplitude of final pulse, promptly laser radiation power is greater than the laser radiation power of other pulse.

Figure 14 shows the variation instance according to the recording impulse string of example 3.Reduce the laser radiation power of the multipulse front end pulse among recording impulse string (2n+1) T, increase the laser radiation power of rear end pulse.

Figure 15 shows the variation instance according to the recording impulse string of example 4.Multipulse front end pulse in first pulse and recording impulse string 2nT and rear end pulse place increase laser radiation power.

Figure 16 shows the variation instance according to the recording impulse string of example 5.First pulse in recording impulse string 2nT and final pulse place increase laser radiation power.

Figure 17 shows the variation instance according to the recording impulse string of example 6.Multi-pulse train place in recording impulse string 2nT increases irradiation power.

In addition, in the present embodiment, can in the recording impulse string, provide level to utilize the power drive laser diode lower than bias power.For example, in the end after the pulse, or before the multi-pulse train and certain time afterwards, can provide cycle on the down position of final pulse in the lifting position of first pulse with the power that is lower than bias power.According to present embodiment, even when improving writing speed, can reduce the influence of the rise time and the fall time of laser instrument.Therefore, present embodiment also is effective when the power that is lower than bias power rises to peak power.In this case, can utilize record compensated part 108 that the end position in these cycles of each mark is carried out the accurate adjustment joint.Therefore, can on more accurate location, write down these marks.

In addition, in example, change output in the peak power of predetermined pulse referring to figs 12 to 17 explanations.Yet, also can change other power that is used on CD forming mark, bias power for example is to regulate laser radiation power.In this case, can on CD, form and have the more mark of suitable shape.

In addition, can be to some or all section irradiation power of for example first pulse, some or all multi-pulse train, regulate with some or all section irradiation power of final pulse, can utilize record compensated part 108 and Beam Control part 104 at each or institute is underlined regulates jointly.Therefore, can be with label record to more accurate location.

Therefore, can on CD, write down first pulse, final pulse and multipulse irradiation start position information, irradiating width information, irradiation ending message and irradiation power information.By these kinds of information of record on CD, compact disk equipment can be handled various CDs, thereby improves the dirigibility of the design in the CD manufacturing.

In addition, can be on CD record code, with be identified in recording impulse string 2nT and (2n+1) have in each of T equal number of pulses Fig. 2 recording method and in each of recording impulse string (2n-1) T and 2nT, have the recording method of Fig. 6 of equal number of pulses.Therefore, can select recording method, thereby improve the dirigibility of design in the CD manufacturing according to the feature of CD.

In addition, the mark configuration information can be recorded on the CD, be to be made of individual pulse with among the difference record mark 3T to 11T each, only constitute, only constitute, still by first pulse by first pulse and final pulse by first pulse, the whole of multiple-pulse and final pulse constitute.

When on CD, having write down these kinds of information, for example, the enterprising line item of data information area on the inside circumference of CD.After CD is loaded into CD drive, or just between the starting period before the record data, can read these information.

Utilization is according to pulse waveform structure of the present invention, and at each 1T multipulse quantity increased by 1 prior art and compares, and the interval between multipulse width and the adjacent multiple-pulse almost doubles.Even the raising writing speed also can correctly be carried out record.

In addition, except that multiple-pulse, will comprise that the pulse width of given pulse of first pulse and final pulse and the recurrent interval between any adjacent pulse be set at about 1T, so that can strengthen effect.

In addition, present embodiment provides regularity, so that the every 2T increase by 1 of multipulse quantity, so that utilize the multipulse simple structure that produces as each 1T to produce multiple-pulse.

Present embodiment has been described phase change disc, and present embodiment also can be applicable to magneto-optic disk, has the effect identical with present embodiment.

(embodiment 2)

As described in example 1 above, by equilibrium writing train of impulses 2nT and (2n+1) number of pulses in each multi-pulse train of T or recording impulse string (2n-1) T and 2nT, the laser radiation power of two recording impulse strings can differ from one another.This is the dutycycle difference owing to mark/gap, or the mean value difference between the multi-pulse train.

Figure 18 A and 18B show record mark and the reproducing signal that obtains from the record mark that forms.This record mark is formed with the recording impulse string 8 that forms mark 10T by the recording impulse string 2 of the mark 9T that is used to form Figure 10.

Shown in Figure 18 A, in recording impulse string 2, first pulse 9 and final pulse 10 respectively have the pulse width of 1T, and provide the mark of the recording film that is suitable for CD to form heat energy.Therefore, the record mark 4 that form has almost width uniformly, and reproducing signal 6 almost is shaped to such an extent that resemble and have mark center and do not have recessed trapezoidal.In other words, reproducing signal 6 is fit to.

On the other hand, in recording impulse string 8, because first pulse and final pulse respectively have the width of 1.5T, mark forms heat energy and increases on the forward position and the edge, back of mark.Therefore, the width of the record mark 13 that form in its forward position and back along increasing, so that mark 13 is shaped to such an extent that resemble array.The reproducing signal 14 that obtains from the mark that is shaped as array 13 has the bimodal shape waveform by the amplitude distortion that increases at rising edge and falling edge.When converting this bimodal shape reproducing signal to digital signal by binarization or AD conversion, on the rising edge of waveform and falling edge, shake, cause the bit error of reproduction period.

In the present embodiment, form heat, set the pulse position and the pulse width of multi-pulse train in order in each recording impulse string, to obtain suitable mark, simultaneously with the mean value of the amplitude of dutyfactor value or multi-pulse train as target.

Figure 19 shows the recording impulse string 16 of present embodiment, record mark 15 that is formed by recording impulse string 16 and the reproducing signal 17 that is obtained by record mark 15.The length 10T that recording modulation codes is described below is an example.

Recording impulse string 16 is by first pulse 18, and multi-pulse train 19 and final pulse 20 constitute.

Set the timing of first pulse 18 by first pulse rising timing TSFP and first pulse decline timing TEFP.Simultaneously, by regularly TSLP and the regularly timing of TELP setting final pulse 20 of final pulse decline of final pulse rising.By the rising timing TSMP of multi-pulse train and the arrangement of pulse width T MP setting multi-pulse train 19.

Relation between the waveform of the shape of variation in the parameter that constitutes this recording impulse string 16 and record mark 15 and reproducing signal 17 will be discussed below.

Determine the position, forward position 21 of record mark 15 by first pulse rising timing TSFP.

The position, forward position 21 of record mark 15 is disturbed from the heat of previous record mark to shift, so that reproducing signal 17 is indicated and change as the arrow 22 of Figure 19.In order to arrive suitable position in the position, forward position 21 of controlling recording mark 15, suitably set regularly TSFP of first pulse rising according to the length in previous gap and the length of record mark 15.Therefore, make up the record mark of the gap and the back of front howsoever, can the position, forward position 21 of record mark be controlled to suitable position, reduce the jittering component on the forward position 22 of waveform of reproducing signal according to recording modulation codes.

On the other hand, by final pulse descend regularly that TSLP determines record mark 15 back along the position 23.Record mark 15 back 23 disturbed from the heat of a back record mark and shifted along the position, so that reproducing signal 17 is indicated and change as the arrow 24 of Figure 19.

For with record mark 15 back along the position 23 control appropriate locations, suitably set the final pulse regularly TSLP that descends according to the length of the length in the gap of front and record mark 15.Therefore, make up the gap of record mark and back howsoever, can record mark back 23 be controlled to suitable position along the position, reduce waveform back of reproducing signal along the jittering component on 24 according to recording modulation codes.

Determine the front porch width 25 of record mark 15 by first pulse decline timing TEFP.The width of first pulse 18 is determined in first pulse decline regularly TEFP, and allows control to be applied to the heat energy in record mark forward position, so that the front porch width 25 of record mark is controlled to suitable width.As the position, forward position 21 of record mark, from the heat of the record mark of front disturb and the code length of record mark 15 less to the influence of the front porch width 25 of this record mark.Therefore, usually first pulse is set at constant value, and irrelevant with the code length of the code length in the gap of front and record mark 15.

So set the first pulse regularly TEFP that descends, so that the front porch width 25 of record mark can be controlled to suitable width, and can reduce outburst on the forward position of reproducing signal 17.Therefore, in the reproducing signal that utilizes long recording modulation codes to obtain, can reduce the jittering component that causes by the changes in amplitude on the forward position.

Rising regularly by final pulse, TSLP determines the back along width 27 of record mark 15.The width of final pulse 20 is determined in final pulse rising regularly TSLP, and allows to control the heat energy on the back edge that is applied to record mark, so that the back of record mark controlled to suitable width along width 27.As record mark back along the position 23, from the heat of the record mark of back disturb and the code length of record mark 15 less to the back influence of this record mark along width 27.Therefore, usually final pulse is risen timing setting at steady state value, and irrelevant with the code length of the code length in the gap of back and record mark 15.

So set regularly TSLP of final pulse rising, so that the back of record mark 15 can be controlled to suitable width along width 27, and can reduce the back of reproducing signal 17 along last outburst.Therefore, in the reproducing signal that obtains by long recording modulation codes, can reduce the jittering component that causes along last changes in amplitude by the back.

Regularly TSMP and multi-pulse train width TMP determine the pericentral width 29 of record mark 15 by the rising of multi-pulse train.As described in Example 1, cycle of multi-pulse train is set in 2T, even so that when high transfer rate with multi-pulse train driving laser diode definitely.

Under situation with high transfer rate and high density recording, and compare with the situation of low-density record with low transfer rate, shortened the irradiation time of laser beam.Therefore, the width of multi-pulse train need be set more accurately, to form suitable record mark width.In addition, when the cycle of multi-pulse train was set in 2T, the gap 33 that makes the width TMP of multi-pulse train and multi-pulse train was greater than cycle 1T, so that heat energy is distributed probably unevenly.Therefore, suitably setting multi-pulse train is very important to the record mark that forms optimum width.

Around the center of record mark 15, form mark according to the total heat energy of multi-pulse train 19.Therefore, by the rising of multi-pulse train 19 regularly TSMP and the pulse width T MP that constitutes the pulse of multi-pulse train 19 determine the structure of multi-pulse train, can control the heat energy of center peripheral part of the major part that is applied to record mark.Therefore, the pericentral width 29 of record mark 15 can be adjusted to suitable width.

By this way, the pericentral width 29 of record mark 15 is adjusted to proper width, thereby reduces the pericentral changes in amplitude of reproducing signal 17.Therefore, can reduce the jittering component that the changes in amplitude of the reproducing signal 17 that obtained by long recording modulation codes causes.

As mentioned above, form the pericentral part of record mark 17 by the total heat energy of multi-pulse train 19.At this moment, available two different degree of accuracy definition comprise the zone of multi-pulse train 19.Use different degree of accuracy according to the sensitivity of recording materials and the label record speed of CD.

Low relatively and have in the CD of recording materials of low record sensitivity in label record speed, the pericentral mark pattern of the major part of record mark 15 is relevant with the decline scope regularly that rising from front end multiple-pulse 19A is timed to rear end multiple-pulse 19C, and influenced by it.Wherein front end multiple-pulse 19A is arranged on the front end of multi-pulse train 19, and rear end multiple-pulse 19C is arranged on the rear end of multi-pulse train.This scope is called as the first multiple-pulse district 31.

On the other hand, high and have in the CD of recording materials of high record sensitivity in label record speed, the pericentral mark pattern of record mark 15 with descend regularly from first pulse that constitutes the recording impulse string TEFP to the end the rising of pulse regularly the scope of TSLP is relevant, and influenced by it.This scope is called as the second multiple-pulse district 32.

In addition, according to the technology of the mark of the recording materials that are used to form CD, provide the heat energy that two kinds of indexs are indicated the center peripheral part that forms record mark 15.

In the specific cool time that CD has the rayed part in the multiple-pulse district, i.e. under the situation of the recording materials that the pericentral part of the 33 pairs of formation in the gap of multi-pulse train 19 record mark 15 is very important, with the index of multiple-pulse dutycycle as heat energy.The multiple-pulse dutycycle is by the value that multiple-pulse width TMP was obtained divided by cycle of the multi-pulse train in the multiple-pulse district (being 2T among Figure 19).

On the other hand, under CD has the situation of average light irradiation energy to the recording materials of the pericentral part very important (or correlativity is strong) that forms record mark 15 in the multiple-pulse district, with the index of multiple-pulse amplitude mean value as heat energy.Multiple-pulse amplitude mean value is the value that obtains with the time width in the multiple-pulse district by the integer division with the amplitude in multiple-pulse district.

As mentioned above, as evaluation index, the rising of regulating multi-pulse train 19 is TSMP and multi-pulse train width TMP and the pericentral width 29 of maintenance record mark 15 suitably regularly with multiple-pulse dutycycle and multiple-pulse amplitude mean value.

In addition, for the width on the forward position that makes record mark 25 even, preferred timing below, in the mode of balance more, carry out the pericentral width 29 of record mark, the back setting of record mark along last width 27:

Be provided with the rear end pulse 19C of front end gap width FSP between the front end pulse 19A of balanced first pulse 18 and multiple-pulse 19 and multiple-pulse 19 and the rear end gap width LSP between the final pulse 20.Like this, carry out the setting of FSP=LSP so that the energy that multiple-pulse 19 is applied is transmitted into the pericentral part of record mark in the mode of balance, and be not biased to record mark the forward position or the back edge.Therefore, make the

width

25,29 and 27 of record mark almost equal, and can vertically form record mark with equal widths.

As mentioned above, as index, the rising of setting multi-pulse train is the width TMP of the multi-pulse train in TSMP and the multiple-pulse district regularly, the width FSP of preceding splaying with multiple-pulse dutycycle and multiple-pulse amplitude mean value, with the width LSP of splaying, back, so that these parameters play the effect of intended target.Therefore, even under the situation that high transfer rate writes down with high density, can form record mark with suitable width.Therefore, can reduce the reduction 30 in the wave-shape amplitude in center cycle of reproducing signal, and reduce the jittering component that causes by the variation in the amplitude of the reproducing signal waveform in the long recording modulation codes.

With reference to Figure 20, each concrete grammar regularly that is used to calculate recording impulse string 16 according to present embodiment is described below.Figure 20 shows reference clock with the order that begins from above, recording modulation codes, and nT is the recording impulse string of even-numbered and the recording impulse string that nT is odd-numbered.The horizontal direction of Figure 20 as the time base.

Recording modulation codes 35 has the recording modulation codes length that size is reference clock cycle T34 n times (n is equal to or greater than 1 natural number), as the reference element length.When n was even number, pulse descended in the position of the nT36 of even-numbered indication.When n was odd number, pulse descended in the position of the nT37 of odd-numbered indication.When usefulness was modulated recording modulation codes 35 as RLL (2, the 10) modulation scheme of embodiment 1, code length was that 3T is to 11T.

As mentioned above, recording impulse string 16 is by first pulse 18, and multi-pulse train 19 and final pulse 20 constitute.

By the rising of first pulse 18 regularly TSFP and first pulse 18 decline regularly TEFP determine the timing of first pulse 18.Because the value of TSFP does not influence the subsequent algorithm result of multi-pulse train, is simplified illustration, not shown should the value.This value is set at TSFP=0.Figure 19 is described as reference, suitably sets TSFP according to the code length in gap, front and the code length of record mark.As mentioned above, usually TSFP is set at constant value, and has nothing to do with the code length in gap, front and the code length of record mark.

On the other hand, by the rising of final pulse 20 regularly TSLP and final pulse 20 decline regularly TELP determine the timing of final pulse 20.As mentioned above, TSLP is set at constant value, and has nothing to do with the code length in gap, back and the code length of record mark.The TSLP (not shown) is set to as TSLP=0, has reduced to reproduce the back along last outburst of waveform.Figure 19 is described as reference, suitably sets TELP according to the code length in gap, back and the code length of record mark.

The rising timing TSMP that calculates the multi-pulse train 19 in the multiple-pulse district will be described below, the width TMP of multi-pulse train, the method for the timing of the width LSP of the width FSP of preceding splaying and splaying, back.

Example 1 is discussed below, and in example 1, the center that the influence record mark scope of width on every side is the first multiple-pulse district 31.The index of the timing of control multi-pulse train is the multiple-pulse dutycycle.

The first, be that the situation of the nT of even-numbered is operated at recording modulation codes length.Under the situation of the nT of even-numbered, with respect to the reference of the even-numbered TRE rising TSMP regularly that calculates multi-pulse train 19 regularly, reference the timing TRE of even-numbered is from the rising constant time lag 2T of recording modulation codes 35.

As shown in figure 20, determine the width FSP of preceding splaying and the width LSP of splaying, back by following computing (40).

FSP＝2T-TEFP+TSMP

LSP＝2T-TMP-TSMP ...(40)

In addition, when setting FSP=LSP as mentioned above so that the forward position of the mark width of holding the record and back along between balance the time, according to computing (40), the rising that obtains multi-pulse train by following computing (41) is TSMP regularly.

TSMP＝(TEFP-TMP)/2 ...(41)

At recording modulation codes length is that the situation of odd-numbered nT is carried out computing.

Reference timing TRO calculating nT with respect to odd-numbered is the TSMP of odd-numbered, and the reference timing TRO of odd-numbered is from the rising constant time lag 3T of recording modulation codes 35.

With reference to Figure 20, determine the width FSP of preceding splaying and the width LSP of splaying, back by following computing (42).

FSP＝3T-TEFP+TSMP

LSP＝3T-TSMP-TMP ...(42)

When setting FSP=LSP as mentioned above, so as the forward position of the mark width of holding the record and back along between balance the time, according to computing (42), the rising that obtains multi-pulse train by following computing (43) is TSMP regularly.

TSMP＝(TEFP-TMP-1T)/2 ...(43)

On the other hand, be the value that the width TMP of multi-pulse train 19 was obtained divided by cycle (being 2T among Figure 20) of the multi-pulse train 19 in the first multiple-pulse district 31 as the multiple-pulse dutycycle MPD of controlled target.Therefore, obtain multiple-pulse dutycycle MPD by following computing (44).

MPD＝TMP/2T

So, TMP=2TMPD ... (44)

As mentioned above, with the decline of first pulse 18 regularly TEFP be set at constant value, and irrelevant with the code length of the code length in gap, front and record mark.In this example, below being set at, TEFP makes the value of the part indication that the outburst on the waveform forward position of reproducing signal reduces.

TEFP＝1.5T

In addition, owing to need suitably the hold the record pericentral width 29 of mark of multiple-pulse dutycycle MPD, the value of selecting to make the pericentral wave-shape amplitude of reproducing signal to reduce littlelyr.According to observations, represent the appropriate value of MPD in this example by following equation to the waveform of reproducing signal.

MPD＝0.5

With the value substitution operation expression (40) of TEFP and MPD to (44), to calculate the FSP in the record modulation code length, LSP, the timing value of TSMP and TMP.Figure 21 shows the recording impulse string that obtains according to this example.

As shown in figure 21, the multiple-pulse dutycycle MPD in the first multiple-pulse district 31 has equal value 0.5 in each record modulation code length.In addition, in same recording modulation codes, the width FSP of the width FSP of preceding splaying and splaying, back equates.

Like this, according to present embodiment,, equate the pericentral irradiation heat energy of record mark and cool time that the heat energy in whole recording modulation codes on forward position and the edge, back does not lose its balance in each record modulation code length.Therefore, for the recording modulation codes of any length, can stably form the record mark that has equal wide from the forward position to the edge, back.

Low relatively in label record speed, recording materials with low sensitivity, and under the situation of the CD that partly needs specific cool time for the rayed in multiple-pulse district, use the recording impulse string record data of Figure 21, so that can control the width of the record mark that forms equably to the edge, back from the forward position.Therefore, reproducing signal is had under the situation of bimodal waveform shown in Figure 180, can reduce to carry out record with pericentral wave-shape amplitude lessly at reproducing signal.

The example 2 of present embodiment is described below.In example 2, the scope that influences the pericentral mark width of record mark is the first multiple-pulse district 31, and the index that is used to control the timing of multi-pulse train is a multiple-pulse amplitude mean value.

As shown in figure 20, under the situation of the nT of even-numbered, with respect to the reference of the even-numbered TRE rising TSMP regularly that calculates multiple-pulse 19 regularly, reference the timing TRE of even-numbered is from the rising constant time lag 2T of recording modulation codes 35.Under the situation of the nT of odd-numbered, with respect to the reference of odd-numbered regularly TRO calculate TSMP, reference the timing TRO of odd-numbered is from the rising constant time lag 3T of recording modulation codes 35.

With reference to Figure 20, obtain the width FSP of preceding splaying and the width LSP of splaying, back by following computing (45).

FSP=2T-TEFP+TSMP (nT of even-numbered)

FSP=3T-TEFP+TSMP (nT of odd-numbered)

LSP＝2T-TMP-TSMP ...(45)

In addition, when setting FSP=LSP as mentioned above, so that during the even width of the mark width of holding the record, according to computing (45), the rising that obtains multi-pulse train 19 by following computing (46) is TSMP regularly.

TSMP=(TEFP-TMP)/2 (nT of even-numbered)

TSMP=(TEFP-TMP-1T)/2 (nT of odd-numbered)

...(46)

On the other hand, be by the amplitude integer division of first pulse area 31 time width with the first multiple-pulse district 31 is obtained as the multiple-pulse amplitude mean value MPM of controlled target.Therefore, multiple-pulse amplitude mean value MPM is calculated in the computing below Figure 20 (47), and wherein INT (X) is the function that is used for the integer of calculated value X.

MPM＝TMP·INT{(nT-4T)/2}/(nT-2T-TEFP-FSP-LSP) ...(47)

When operation expression (46) substitution operation expression (47) and when calculating multiple-pulse width TMP, the operation expression (48) below obtaining.

TMP=MPM (nT-6)/[INT{ (nT-4)/2) }-MPM] (nT of even-numbered)

TMP=MPM (nT-7)/[INT{ (nT-4)/2) }-MPM] (nT of odd-numbered)

...(48)

In the present embodiment, with the decline of first pulse 18 regularly TEFP be set at constant value, and irrelevant with the code length of the code length in the gap of aforesaid front and record mark.In this example, set this value lower, so that the outburst of the waveform on the forward position of reproducing signal is less.

TEFP＝1.5T

In addition, for the multiple-pulse amplitude mean value MPM of the width 29 around the mark center of need suitably holding the record, be chosen in the pericentral wave-shape amplitude of reproducing signal and cause the value that reduces more for a short time.According to observations, represent suitable value with MPM=0.5 in this example to the waveform of reproducing signal.

With the value substitution operation expression (45) of TEFP and MPD to (48), to calculate the FSP in each record modulation code, LSP, the timing value of TSMP and TMP.Figure 22 shows the waveform of the recording impulse string that obtains according to this example.

As shown in figure 22, the multiple-pulse amplitude mean value MPM in the first multiple-pulse district 31 equals 0.5, and irrelevant with recording modulation codes.In addition, in same recording modulation codes, the width FSP of the width FSP of preceding splaying and splaying, back also equates.

Like this, according to this example, in each recording modulation codes, the pericentral average irradiation energy of record mark is equal, on whole recording modulation codes, and the forward position, the heat energy on the part around back edge and the mark center does not lose its balance.Therefore, for recording modulation codes, can stably form the record mark that has equal wide from the forward position to the edge, back.

Low relatively in label record speed, recording materials have low sensitivity, and the average light irradiation energy in the multiple-pulse district utilizes the recording impulse string formation of Figure 22 to have the record mark of even width from the forward position to the edge, back to forming on the very important CD of record mark.Therefore, reproducing signal is had under the situation of bimodal waveform shown in Figure 180, can make the pericentral wave-shape amplitude of reproducing signal reduce to carry out record lessly.

Example 3 is described below.In example 3, the scope that influences the pericentral mark width of record mark is the second multiple-pulse district 32, and the index that is used to control the timing of multi-pulse train is a multiple-pulse amplitude mean value.

As shown in figure 20, as example 2, calculate the width FSP of preceding splaying and the width LSP of splaying, back with the computing (49) of following Figure 20.

FSP=2T-TEFP+TSMP (nT of even-numbered)

FSP=3T-TEFP+TSMP (nT of odd-numbered)

LSP＝2T-TMP-TSMP ...(49)

In addition, when setting FSP=LSP as mentioned above, so that during the even width of the mark width of holding the record, according to computing (49), the rising that obtains multi-pulse train by following computing (50) is TSMP regularly.

TSMP=(TEFP-TMP)/2 (nT of even-numbered)

TSMP=(TEFP-TMP-1T)/2 (nT of odd-numbered)

...(50)

On the other hand, be by the amplitude integer division in the second multiple-pulse district 32 time width with the second multiple-pulse district 32 is obtained as the multiple-pulse amplitude mean value MPM of controlled target.Therefore, calculate multiple-pulse amplitude mean value by following computing (51), wherein INT (X) is the function that is used for the integer of calculated value X.

MPM＝TMP·INT{(nT-4T)/2}/(nT-2T-TEFP) ...(51)

When calculating multiple-pulse width TMP with expression formula (51), the operation expression (52) below obtaining.

TMP＝MPM·(nT-2T-TEFP)/INT{(nT-4)/2)}

...(52)

In this example, with the decline of first pulse 18 regularly TEFP be set at constant value, and irrelevant with the code length of the code length in the gap of aforesaid front and record mark.In this example, set this value lower, so that the outburst of the waveform on the forward position of reproducing signal is less.

TEFP＝1.5T

In addition, for the multiple-pulse amplitude mean value MPM of the width 29 around the mark center of need suitably holding the record, select to make reproducing signal pericentral wave-shape amplitude reduce littler value.According to observations, represent suitable value with MPM=0.5 in this example to the waveform of reproducing signal.

With the value substitution operation expression (49) of TEFP and MPD to (52), to calculate the FSP in each recording modulation codes, LSP, the timing value of TSMP and TMP.Figure 23 shows the waveform of the recording impulse string that obtains according to this example.

As shown in figure 23, the multiple-pulse amplitude mean value MPM in the second multiple-pulse district 32 equals 0.5, and irrelevant with recording modulation codes.In addition, in same recording modulation codes, the width FSP of the width FSP of preceding splaying and splaying, back also equates.

Like this, according to this example, in each recording modulation codes, the pericentral average irradiation energy of record mark is equal, on whole recording modulation codes, and the forward position, the heat energy on the part around back edge and the mark center does not lose its balance.Therefore, can stably form the record mark that has equal wide from the forward position to the edge, back.

Relatively should in label record speed, recording materials have high sensitivity, and the average light irradiation energy in the multiple-pulse district can utilize the recording impulse string formation of Figure 23 to have the record mark of even width from the forward position to the edge, back to forming on the very important CD of record mark.Therefore, reproducing signal is had under the situation of bimodal waveform shown in Figure 180, can make the pericentral wave-shape amplitude of reproducing signal reduce to carry out record lessly.

In the present embodiment, calculate and set the timing value (FSP, LSP, TSMP, and TMP) of wanting controlled recording impulse string at each recording modulation codes.But, in order to shorten the setting-up time of recording unit, reducing the circuit scale of recording unit, or simplify this circuit, can set two kinds of timing values at the nT of the even-numbered of recording modulation codes length and the nT of odd-numbered.For example, in the recording impulse string of Figure 21, operate,, obtain two kinds of arithmetic result at the nT of even-numbered and the nT of odd-numbered to calculate each timing value at each recording modulation codes.In other words, timing value is expressed as follows.

The nT of even-numbered:

FSP＝LSP＝0.75T

TMP＝1.0T

TSMP＝0.25T

The nT of odd-numbered:

FSP＝LSP＝1.25T

TMP＝1.0T

TSMP＝-0.25T

In addition,, each recording modulation codes can be divided into code length group according to code length classification based on same reason, and can be in the code length group with the timing value of the value setting recording pulse that equates (FSP, LSP, TSMP, TMP).

As optional mode, in order to reduce circuit scale etc., can (TSMP TMP) all be set at equal value for FSP, LSP, and irrelevant with the length of recording modulation codes with the timing value of recording impulse.

Simultaneously, in the example 1 to 3 of present embodiment,, and use this to be worth to determine the timing value of all recording impulse strings according to the desired value of the observations of reproducing signal waveform being set the multiple-pulse dutycycle or multiple-pulse amplitude mean value.Yet, for the width of controlling recording mark more accurately, can use the following step: recording modulation codes is divided into concrete code-group, be that each code-group sets the desired value or the multiple-pulse amplitude mean value of multiple-pulse dutycycle, and use different desired values to determine timing value at each code-group.In addition, for the width of controlling recording mark more accurately, recording modulation codes can be divided into nT two classes of the nT and the odd-numbered of even-numbered, setting the desired value of index, or be the length setting desired value of each recording modulation codes.

With reference to Figure 24, the assessment reproducing signal is described below to determine whether multiple-pulse dutycycle and multiple-pulse amplitude mean value are suitable for the method as the index of the timing value in the recording impulse string.

When multiple-pulse dutycycle and multiple-pulse amplitude mean value were not suitable for, the energy that is used to shine center peripheral part of record mark became not enough, and therefore, the width of mark center reduces, and forms the bimodal mark 5 with littler width around mark center.When reproducing bimodal mark 5, reduced reproducing signal 7 in the wave-shape amplitude value around centre, cause having the distortion waveform of bimodal shape.

Usually will be used for scale-of-two restriction (slice) level 57 that reproducing signal 7 converts numerical data to is arranged to approximately is half of amplitude peak of waveform of reproducing signal 7.Therefore, under the situation of the cut-off level that is fit to, obtain binary digital signal 59.

When increasing cut-off level and setting scale-of-two cut-off level 58, cut apart the part that the pericentral amplitude of reproducing signal 7 reduces by scale-of-two cut-off level 58, and produce the binary digital signal 60 of the train of impulses that comprises two pulses.Because low level 61 occurs at the halfway by binary digital signal 60, reproduction can not be carried out correct recording modulation codes.

Therefore, at first set multiple-pulse dutycycle and multiple-pulse amplitude mean value in the multiple-pulse district, and, utilize setting value to determine the timing value of recording impulse string according to top method.Utilize the recording impulse string of determining on CD, to form record mark.Next, utilize the scale-of-two cut-off level higher that the reproducing signal that obtains from the record mark that forms is carried out binarization than common cut-off level.Whether the binary signal that decision obtains comprises low level and forms two pulses.

When binary signal comprised two pulses, the width that can be understood as the record mark center reduced.In other words, it is improper to find to be set to the desired value of multiple-pulse dutycycle and multiple-pulse amplitude mean value.

Like this, according to present embodiment, the cycle of multi-pulse train is set at 1T or bigger, and the rising timing TSMP of setting multi-pulse train, the width TMP of multi-pulse train, the width LSP of the width FSP of the preceding splaying in the multiple-pulse district and splaying, back is so that be set in predetermined target value with multiple-pulse dutycycle and multiple-pulse amplitude mean value.Therefore, even carry out record, also can obtain to form the recording impulse string of record mark with the width that is fit to high transfer rate and high density.The waveform amplitude around centre of the reproducing signal that is obtained by formed record mark has less reducing, and the rising edge of signal and negative edge are less to deform.Therefore, even when record length recording modulation codes, also can reduce the influence of shake and suppress to reproduce bit error.

In addition, according to the present invention, by the amplitude that reduces around the waveform center of detecting reproducing signal, the width that reduces around can the center of record mark.Therefore, can determine whether multiple-pulse dutycycle and multiple-pulse amplitude mean value in the multiple-pulse district are the controlled target that is fit to.

Industrial applicibility

According to the present invention, even with high transfer rate record data the time, also can be such as CD Form the record mark with correct shape on the data storage medium. Therefore, method of the present invention is fit to The CD that is used for the CD that records take high density and high transfer rate and provides as this CD is established Standby.

Claims

1. optical data recording method comprises step: the data that modulation will be write down, to produce a plurality of recording modulation codes; With to CD transponder pulse class light beam, so that on CD, form a plurality of record marks and the gap have with the corresponding length of these a plurality of recording modulation codes, wherein

At least two marks in these a plurality of record marks are by forming according to recording impulse string emitted light beams, and this recording impulse string comprises: be arranged on front end and form first pulse in the forward position of record mark; Be arranged on the rear end and form the final pulse on the back edge of record mark; And be arranged between first pulse and the final pulse and form the multi-pulse train at the middle part of record mark,

This multi-pulse train has the recurrence interval longer than the T in the reference cycle of representing recording modulation codes,

These a plurality of record marks have the different length of being represented by T or its multiple,

Along with the length increase 2T of record mark, the quantity of pulse increases by 1 in each recording impulse string, and

The 3rd short record mark and the 4th short record mark is made of two pulses respectively.

2. method that produces data carrier, wherein, by the modulation data that will write down to produce a plurality of recording modulation codes, and transponder pulse class light beam, thereby on this data carrier, form a plurality of record marks and the interval that have with the corresponding length of these a plurality of recording modulation codes, the method comprising the steps of: on this data carrier, form one or more shapes in the shape of a spiral or concentrically ringed track be used for record data, wherein

3. an optical data reproducting method comprises step: to data carrier emission light beam; And reproduction record mark, wherein, by the modulation data that will write down producing a plurality of recording modulation codes, and to this data carrier transponder pulse class light beam, come on this data carrier, to form a plurality of record marks and the interval that have with the corresponding length of these a plurality of recording modulation codes, wherein

4. data recording equipment comprises:

Shaven head has light source, and launches light beam on CD;

Signal processing, the data that modulation will be write down also produce a plurality of record modulation codes;

The recording impulse string produces part, produces a plurality of recording impulse strings that are used for driving light source according to recording modulation codes, so that on CD, form a plurality of marks that have with the corresponding corresponding length of recording modulation codes,

Wherein, at least two marks in these a plurality of record marks are by forming according to recording impulse string emitted light beams, and this recording impulse string comprises: be arranged on front end and form first pulse in the forward position of record mark; Be arranged on the rear end and form the final pulse on the back edge of record mark; And be arranged between first pulse and the final pulse and form the multi-pulse train at the middle part of record mark,

Wherein, this recording impulse string comprises the multiple-pulse district, and multi-pulse train is arranged in this multiple-pulse district,

The position of at least one pulse in this multiple-pulse district in the recording impulse string is set, makes the multiple-pulse dutycycle is arranged on predetermined value, the multiple-pulse dutycycle is by obtaining the pulse width of the multi-pulse train cycle divided by multi-pulse train; And

Multi-pulse train has recurrence interval of twice size of the reference cycle T of recording modulation codes.