CN1942936A

CN1942936A - Recording/reproduction method for optical recording medium, recording condition determining method, recording method, optical disk apparatus, program, and recording medium thereof

Info

Publication number: CN1942936A
Application number: CN 200580011815
Authority: CN
Inventors: 笹登; 林嘉隆; 藤井俊茂
Original assignee: Ricoh Co Ltd
Current assignee: Ricoh Co Ltd
Priority date: 2004-04-19
Filing date: 2005-04-18
Publication date: 2007-04-04
Also published as: JP2005310228A

Abstract

A recording/reproduction method for recording/reproducing data to/from an optical recording medium including a guiding groove and a recording layer is disclosed. The recording/reproduction method includes a step of irradiating a laser beam onto the optical recording medium by modulating at least one of a laser irradiation time and a laser irradiation intensity to two or more values, wherein a Pbi/Pr ratio of a reproduction power (Pr) and a bias power (Pbi) is set to a value that is no less than 0.5, wherein the data are recorded by constantly providing the laser beam with a power level including the reproduction power (Pr) added to the bias power (Pbi).

Description

The recording/reproducing method of optical recording media, record condition are determined method, recording method, optical disc apparatus, program and recording medium thereof

Technical field

The present invention relates to a kind of recording/reproducing method of optical recording media, be used for by write down binary data or three grades or the more multistage multi-stage data of two-stage (level) to optical recording media radiation laser such as CD.The present invention also relates separately to and a kind ofly is used to determine that the record condition of the record condition of on CD three grades of records or more multistage multi-stage data determines method, recording method, optical disc apparatus, program and the recording medium that is used to write down multi-stage data.The invention still further relates to a kind of recording method and optical disc apparatus, be used for by using pulsed light emission to come radiation laser at the recording layer record data of CD.

Background technology

Traditionally, by coming according to predetermined (reference period) T normal period forming the next data recording desired in optical recording media of mark and pit on the optical recording media in regular turn.Described in optical recording media method for recording data use the data (binary data) of binarization usually, whether described binary data depends on to exist on the presumptive area of optical recording media and (has write) record mark.But, for the density with bigger transfer rate and Geng Gao realizes recording of information, using multi-stage data, described multi-stage data writes down a plurality of information in single record cell.

For example, Japanese Laid-Open Patent Application discloses a kind of method of changing the light quantity that is radiated the laser beam on the CD by the quantity of change light beam, according to data value (data level) for 61-94244 number.Make in this way, can change the degree of depth of the pit that on CD, forms multistagely according to data value.And, Japanese Laid-Open Patent Application disclose for 2-31329 number a kind of on phase change recording medium the method for laser beam radiation, described laser beam has the light quantity of changing according to data value.Make in this way, can come the described phase change recording medium of multistage ground phase transformation according to data value.And.Japanese Laid-Open Patent Application discloses a kind of variation of the orientation (orientation) corresponding to metal complex (metal complex) for 4-238088 number and has write down the method for multistage information.For example, under the situation of using 8 planar orientations, can write down the multi-stage data of maximum 6 grades (values) by the variable that uses maximum 6 variablees (variation).

But, above-mentioned multi-level recording method has a problem usually: wherein, under the situation of carrying out high density recording, the change of the DC level in the reproducing signal and intersymbol interference (intersymbolinterference) cause error rate, feasible variation considerably.

And, the various combinations that the method for a kind of area that changes the record pit and shapes/configurations or a kind of definition record mark position and record mark arrange are disclosed for Japanese Laid-Open Patent Application 8-287468 and 11-25456 number so that the method for multistage average reflectance (reflection coefficient) is provided.

In order to improve recording density by multi-level recording, expectation reduces the size of the unit that is used to write down.And, the unit that uses this size to reduce, the dynamic range of reflectivity change is amplified in expectation.And, preferably,, avoid using complicated recording impulse strategy (strategy) from the aspect of writing speed and driving cost.

Consider these points, in the classic method of the multi-level recording shown in Japanese Laid-Open Patent Application 8-287468 and 11-25456 number, the problem that exists the strategy of recording impulse to be complicated.And, but these multi-level recording methods are the recording methods that are used to have the rewriting type optical recording media of the recording layer that comprises phase-change material, wherein, also there is not to obtain to be used for the multi-level recording method of the satisfaction of recordable type optical recording media (for example write-once repeatedly the optical recording media of recordable type) so far.Especially, in the recordable recordable optical record medium of the use short wavelength laser with the recording layer that comprises organic toner, only can use organic toner (coloring material), described organic toner has big refractive index and less absorption coefficient (approximately 0.05-0.07) at the 405nm place near blue semiconductor laser oscillation wavelength center.Therefore, with respect to the change of recoding/reproduction wavelength, the recordable optical record medium has the problem of nonsteady behavior.Therefore, the recordable type optical recording media that does not also have acquisition to have desirable characteristics so far.

And in Japanese Laid-Open Patent Application 60-150240 invention disclosed, radiation recording impulse in radiation low level laser bundle (reproduction laser light) stops the schedule time with laser emission thus immediately after forming pit.Though it is similar with the waveform of Fig. 1 of the present invention-3 (particularly Fig. 2) that the waveform that Japanese Laid-Open Patent Application is 60-150240 number seems, it is diverse waveform.In other words, if the wave recording that rewrites and express the invention of Japanese Laid-Open Patent Application 60-150240 number in the mode identical with the waveform of the present invention shown in Fig. 1-3, then the difference between the invention is with regard to obvious (referring to Figure 36).

Japanese Laid-Open Patent Application discloses a kind of recording layer (phase change recording layers) that is used in reversible variation method that writes down and the strategy that is used for the rewriting type medium for 63-113938 number.This method is being eliminated upward application records power of power (Pe), and after using described recording power, provides the cooling power that is not more than described elimination power (Pc) immediately.Though this seems to be similar to the recording impulse of the present invention shown in Fig. 2, if with express recording impulse in the identical mode of the recording impulse of the present invention shown in Fig. 1-3, then the difference between the invention is with regard to obvious (referring to Figure 37).And, generally be the prerequisite that rewrites because write down to phase-change material, therefore in order to use predetermined power unchangeably so that when eliminating the record pit that has write, write new record pit, use and eliminate power (Pe).Simultaneously, under the situation of traditional enterprising line item of recordable type optical recording media, the laser beam that use has the power of the reproducing power of being equal to or less than is carried out and is focused on and follow the tracks of, and the light beam that has greater than the power of described reproducing power by radiation comes executive logging.

On the other hand, the present invention includes further to the new feature of reproducing power application bias power with the enhancing recording characteristic.

Simultaneously, because in the last few years in progress on the digital technology and the improvement in data compression technique, the CD that comprises CD (compact disk) and DVD (digital universal disc) wins concern as the medium that are used to write down information such as music, film, photo and computer software (below be also referred to as " content "), described DVD compares with CD and has identical diameter, but has bigger recording capacity (about 7 times data).And the optical disc apparatus that uses CD to be used as carrier is becoming and using widely, and is more cheap because CD is becoming.

In described optical disc apparatus, form meticulous luminous point on the recording surface of the CD by having formed spiral or concentric rail thereon and carry out recording of information and elimination.And, carry out for example reproduction of information according to the light that the recording surface from CD reflects.

Have the marked region of different reflectivity and length and combination recorded information in CD in blank (space) zone and described zone by use.In this case, by being that 0 and 1 combination (binarization processing) comes recorded information in CD with described information translation.The recording method of using described binarization to handle is as described below.

In CD before the recorded information, optical disc apparatus (is called as PCA as test at test zone, power calibration area) writes (record) data in, and obtain best recording power, so that can on the target area of CD, form the marked region and the white space of desired length.This processing is called as OPC (best power control) and handles.

In recordable disc (for example, the CD that write-once repeatedly reads, it has the recording layer that includes organic dye, such as CD-R (CD-can write down), DVD-R (DVD-can write down) and DVD+R (DVD+ can write down)) form in the processing of marked region, heat dyestuff in the recording layer at CD by improving in the emissive power of the laser beam on the CD by radiation, cause the distortion and/or the decomposition of dyestuff thus, and therefore make contact be heated the part distortion and/or the decomposition of the dish substrate of dyestuff.Form in the processing of white space in recordable disc, the emissive power of laser beam is controlled to the degree that is substantially equal in the emissive power of reproduction period, make not cause distortion at dyestuff with in the dish substrate and/or decompose.Thus, form marked region with the reflectivity that is lower than white space.Should be noted that the emissive power during the formation of marked region is called as recording power.And the emissive power during the formation of white space is called as reproducing power.

Forming marked region in this case, (it are called as " Write strategy ") such as shapes, size of the pulse of described emissive power is set according to the rule (formula) of the shape, size etc. of the pulse of definition emissive power, so that reduce the fluctuation of heat distribution, it depends on the marked region that forms or the type of white space before or after the target label zone.Because described Write strategy has big influence for recording quality, therefore described Write strategy is optimized in expectation.

Simultaneously, when the quantity of content continues to increase, be used for also increasing in the expectation of the information of the bigger quantity of single CD record.Be used for making it possible to a kind of method in CD record more information and be by with information translation being the combination of multi-stage data (data level of three or more types, or symbol) and in CD, write the method for data.Therefore, proceed positive research so that this technology is dropped into practical (for example referring to Japanese Laid-Open Patent Application 2001-184647,2002-25114,2002-83445,2002-334438,2002-352428,2002-352429,2002-367182,2003-151137 and 2003-141725).Be to be called as multiple-stage treatment below the processing of 3 grades or more multistage combination with information translation, and the data that are performed multiple-stage treatment are called as multi-stage data.And, use the recording method of multiple-stage treatment to be called as the multi-stage type recording method.

Be used for obtaining the multi-stage type recording method (for example referring to Japanese Laid-Open Patent Application 2003-151137,2003-141725 and 2003-132536 number) of satisfied recording quality in execution, expect acquisition suitable recording power and the Write strategy identical with the binary type recording method.In the multi-stage type recording method, compare with the binary type recording method, linear recording density is higher, and it is littler than the spot diameter of laser facula to be recorded the size of posting field (unit) of single unit (unit) (symbol (symbol)) of multi-stage data.Therefore, described multi-stage type recording method is easy to be subjected to intersymbol interference, in the example shown in the Japanese Laid-Open Patent Application 2003-132536, do not consider the intersymbol interference problem, therefore, when the size of unit is becoming more hour, recording power that is obtained and Write strategy might become and be not suitable for.

In addition, because be expected at the size of the length of the shortest marked region in the binary type recording method and/or the unit in the multi-stage type recording method become shorter/littler, therefore by using the previous Write strategy that uses, marked region may not be formed the shape (target shape) of expectation.

Summary of the invention

Can use according to following processing of the present invention and solve the problems referred to above.

General objects of the present invention provides a kind of recording/reproducing method, is used for by using single recording impulse strategy to realize the binary recording of diadic (level) or the multi-level recording of three values or more many-valued (level).

To achieve these goals, 1 below providing) to 18) invention (hereinafter referred to as invention 1-18).

1) a kind of record and reproducting method, wherein, executive logging under the following conditions: the ratio Pbi/Pr of reproducing power (Pr) and bias power (Pbi) is set to 0.5 or greater than 0.5, and always to the enterprising line item of recordable type optical recording media the time, introduce the power that bias power (Pbi) is added to reproducing power (Pr), described recordable type optical recording media has guide groove (guiding groove) and at least one recording layer, and they can be by arriving two or more values and executive logging and reproduction with laser emission time or laser emission length modulated.

2) a kind of record and reproducting method, wherein, executive logging under the following conditions: the 1/e that is set to the center intensity of laser (diameter of laser beam) ²The ratio of length L of diameter D and the record unit's (elementary cell) that is used for multistage record mark of light beam be the scope of D/L＞1, and the Pbi/Pr ratio of reproducing power (Pr) and bias power (Pbi) is set to 0.5 or greater than 0.5, and always to the enterprising line item of recordable type optical recording media the time, introduce the power that bias power (Pbi) is added to reproducing power (Pr), wherein, the record unit of record mark is rule circular (cycle), radiation by laser beam, the α kind of the record mark in described record unit (α 〉=3) size and/or the degree of depth are changed with multi-stage data and are recorded, and detect the α kind (α 〉=3) that causes by the difference of the size of record mark and/or the degree of depth different order of reflection mutually, and can reproduce multi-stage data.

3) as 2) described in record and reproducting method, wherein, use following strategy to come executive logging: the ratio Wt/Lt of the time width Lt of the whole burst length width W t of maximum level mark and elementary cell length is between 0.3-0.8 at least.

4) as 3) described in record and reproducting method, wherein, under the condition of the track space 0.25-0.5 of guide groove micron, degree of depth 15-150nm and average well width 0.15-0.35 micron on the recordable type optical recording media executive logging, and to use the reflectivity of the non-record of the laser beam in the blue wavelength region under 450nm be 2-50%.

5) as 1) to 4) one or more records and reproducting method, wherein, the average groove width Wg of guide groove and the ratio Wg/L of length L of record unit's (elementary cell) that is used for multistage record mark are between 0.7 to 1.5.

6) as 1) to 5) one or more records and reproducting method, wherein, the ratio L/Dp of depth D p that is used for the length L of record unit's (elementary cell) of multistage record mark and guide groove is between 3 and 8.

7) as 1) to 6) one or more records and reproducting method, wherein, use by two-stage or more than the strategy that the different recording power of two-stage constitutes and come executive logging.

8) as 7) described in record and reproducting method, wherein, described recording power is two stage, and use following strategy to come executive logging: the ratio Pf/Pb of the recording power (Pb) of recording power of first half (Pf) and latter half is between 0.3 and 1.

9) as 7) or 8) described in record and reproducting method, wherein, described recording power is two stage, and uses following strategy to come executive logging: the burst length width W b of the recording power of the latter half of maximum level mark and the ratio Wb/Wt of whole burst length width W t are between 0.3 and 0.8.

10) as 8) or 0) described in record and reproducting method, wherein, executive logging, thus, the transfer point of the recording power (Pb) of recording power of first half (Pf) and latter half is corresponding to the center of elementary cell.

11) as 1) to 10) one or more records and reproducting method, wherein, executive logging on the recordable type optical recording media, described recordable type optical recording media has the thin layer (RO layer (R is the one or more elements from the group selection that is made of Y, B, I, In and lanthanide series, and O expresses oxygen)) of each element that comprises R and Q on its substrate and the thin layer of organic material at least.

12) as 11) described in record and reproducting method, wherein, executive logging on the recordable type optical recording media, wherein, the RO film comprises from one or more element M of following group selection: described group formation is Al, Cr, Mn, Sc, In, Ru, Rh, Co, Fe, Cu, Ni, Zn, Li, Si, Ge, Zr, Ti, Hf, Sn, Pb, Mo, V and Nb.

13) as 11) or 12) described in record and reproducting method, wherein, executive logging on the recordable type optical recording media, the formation of described recordable type optical recording media is the film of the film of RO at least on its substrate, organic material in regular turn and the layer in reflection horizon.

14) as 11) or 12) described in record and reproducting method, wherein, executive logging on the recordable type optical recording media, the formation of described recordable type optical recording media are film, RO layer and the tectal layers of the reflection horizon at least on its substrate, organic material in regular turn.

15) as 11) or 12) described in record and reproducting method, wherein, executive logging on the recordable type optical recording media, described recordable type optical recording media has thin layer (RO layer) and the dielectric layer on its substrate at least, described thin layer comprises that (R is one or more elements of selecting for each element of R and O from the group that is made of Y, B, I, In and lanthanide series, O expresses oxygen), described dielectric layer has the ZnS as principal ingredient.

16) as 15) described in record and reproducting method, wherein, executive logging on the recordable type optical recording media, wherein, the RO film comprises from one or more element M of following group selection: described group formation is Al, Cr, Mn, Sc, In, Ru, Rh, Co, Fe, Cu, Ni, Zn, Li, Si, Ge, Zr, Ti, Hf, Sn, Pb, Mo, V and Nb.

17) as 15) or 16) described in record and reproducting method, wherein, executive logging on the recordable type optical recording media, the formation of described recordable type optical recording media be in regular turn the film of RO at least, dielectric layer and the reflection horizon on its substrate the layer, described dielectric layer has the ZnS as principal ingredient.

18) as 15) or 16) described in record and reproducting method, wherein, executive logging on the recordable type optical recording media, the formation of described recordable type optical recording media is the reflection horizon at least on its substrate, dielectric layer, RO layer and tectal layer in regular turn, and described dielectric layer has the ZnS as principal ingredient.

According to another aspect of the present invention, of the present invention another and more specifically purpose provide a kind of record condition and determine method, be used to be identified for the record condition of record multi-stage data on the track of the recording surface of CD, described record condition determines that method comprises step: a) write a plurality of multi-stage data levels with identical value in a plurality of test zones, each test zone have with the direction of the tangent line of track on designated length, described designated length is greater than the spot diameter of the luminous point that forms in orbit; And b) level (level) according to the reproducing signal that produces from test zone obtains suitable recording power and Write strategy.

Determining in the method according to the record condition of the embodiment of the invention, when maximal value and the difference between the minimum value in the level of reproducing signal can obtain suitable recording power and Write strategy when being not more than reference value.

Determining in the method that according to the record condition of the embodiment of the invention described reference value can be recorded in the CD.

Determining in the method that according to the record condition of the embodiment of the invention described method can also comprise step: the type of c) determining CD; Wherein, select reference value according to the type of CD from predetermined value.

Determining in the method according to the record condition of the embodiment of the invention, described reference value can comprise the value that obtains by computing formula { | DR|/{ γ (α-1) } }, wherein, α is the value that is not more than 3 multi-stage data, DR is in the reproducing signal level of posting field not and has wherein write down poor between the reproducing signal level in zone of maximum mark that γ is not less than 1 value.

Determining in the method that according to the record condition of the embodiment of the invention described multi-stage data can comprise the multi-stage data corresponding to maximum mark, wherein, obtaining described reference value by relating to the reproducing signal that produces from test zone.

Determining in the method according to the record condition of the embodiment of the invention, when the mean value of the level of reproducing signal can obtain suitable recording power and Write strategy when falling into preset range.

Determining in the method according to the record condition of the embodiment of the invention, when the difference between the mean value in the level of at least one and reproducing signal of the minimum value of the level of the maximal value of the level of reproducing signal and reproducing signal is not more than predetermined reference value, can obtain suitable recording power and Write strategy.

Determining in the method that according to the record condition of the embodiment of the invention quantity of the multi-stage data level that can write down is set to satisfy formula in test zone

β=A+2 wherein, β is illustrated in the quantity of the multi-stage data level that writes down in the test zone, wherein, A represents the integer when the result of calculation of round-up (round up) 2R ÷ S, wherein, 2R represents the spot diameter of luminous point, wherein, S represents the length of test zone.

Determining in the method according to the record condition of the embodiment of the invention, the most preceding (foremost) test zone that can obtain and the multistage value of last (rearmost) test zone by the result of calculation of omitting by round down (round down) R ÷ S obtain the reproducing signal that produces from test zone grade.

And, the invention provides a kind of recording method that is used for record multi-stage data on the track of the recording surface of CD, described recording method comprises step: utilize suitable recording power that said method of the present invention obtains and Write strategy to come to write down multi-stage data on the track of the recording surface of CD by use.

And, the invention provides a kind of optical disc apparatus that is used for record multi-stage data on the track of the recording surface of CD, described optical disc apparatus comprises: write part, be used for writing a plurality of multi-stage data levels with identical value at a plurality of test zones, each test zone have with the direction of the tangent line of track on designated length, described designated length is greater than the spot diameter of the luminous point that forms in orbit; Obtain part, be used for obtaining suitable recording power and Write strategy according to the level of the reproducing signal that produces from test zone; And recording section, be used for by using the recording power and the Write strategy that are obtained on the track of the recording surface of CD, to write down multi-stage data.

In optical disc apparatus, when maximal value and the difference between the minimum value in the level of reproducing signal can obtain suitable recording power and Write strategy when being not more than reference value according to the embodiment of the invention.

In the optical disc apparatus according to the embodiment of the invention, described reference value can be recorded in the CD.

In the optical disc apparatus according to the embodiment of the invention, described optical disc apparatus can also comprise: determining section is used for determining the type of CD; Wherein, select reference value according to the type of CD from predetermined value.

In optical disc apparatus according to the embodiment of the invention, described reference value can comprise the value that obtains by computing formula { | DR|/{ γ (α-1) } }, wherein, α is the value that is not less than 3 multi-stage data, DR is in the reproducing signal level of posting field not and has wherein write down poor between the reproducing signal level in zone of maximum mark that γ is not less than 1 value.

In the optical disc apparatus according to the embodiment of the invention, described multi-stage data can comprise the multi-stage data corresponding to maximum mark, wherein, obtains described reference value by relating to the reproducing signal that produces from test zone.

In the optical disc apparatus according to the embodiment of the invention, described recording section can also write down the reference value that is obtained in CD.

In optical disc apparatus, when the mean value of the level of reproducing signal can obtain suitable recording power and Write strategy when falling into preset range according to the embodiment of the invention.

In optical disc apparatus, when being not more than predetermined reference value, the difference between the mean value in the level of at least one and reproducing signal of the minimum value of the level of the maximal value of the level of reproducing signal and reproducing signal can obtain suitable recording power and Write strategy according to the embodiment of the invention.

In optical disc apparatus according to the embodiment of the invention, the quantity of the multi-stage data level that writes down in test zone is set to satisfy formula β=A+2, wherein, β is illustrated in the quantity of the multi-stage data level that writes down in the test zone, and wherein, A represents the integer when the result of calculation of round-up 2R ÷ S, wherein, 2R represents the spot diameter of luminous point, and wherein, S represents the length of test zone.

In optical disc apparatus according to the embodiment of the invention, the Pretesting zone that can be by omitting respectively that result of calculation by round down R ÷ S obtains and the multistage value in last test zone obtain the reproducing signal that produces from test zone grade.

And, the invention provides a kind of program that is used for optical disc apparatus, described optical disc apparatus is used on the track of recording surface of CD and writes down multi-stage data, described program comprises: write processing, be used for writing a plurality of multi-stage data levels with identical value at a plurality of test zones, each test zone have with the direction of the tangent line of track on designated length, described designated length is greater than the spot diameter of the luminous point that forms in orbit; Obtain to handle, be used for obtaining suitable recording power and Write strategy according to the level of the reproducing signal that produces from test zone; And recording processing, be used for by using the recording power and the Write strategy that are obtained on the track of the recording surface of CD, to write down multi-stage data.

And, the invention provides a kind of computer readable recording medium storing program for performing, it comprises said procedure of the present invention.

According to another aspect of the present invention, of the present invention another and more specifically purpose provide a kind of recording method that is used at the recording layer identifying recording layer of CD, described recording method comprises step: a) by the single at least preheat pulse of radiation on CD recording layer is preheating to the temperature less than the initial markers formation temperature, described preheat pulse has greater than the reproducing power of CD with less than the power level of the recording power of CD; B) recording layer is heated to the temperature that is equal to or greater than described initial markers formation temperature by the single at least main pulse of radiation on CD; Described main pulse has the power level identical with the recording power of CD.

In the described recording method according to the embodiment of the invention, described preheat pulse can have 80% the power level that is not more than recording power.

In the described recording method according to the embodiment of the invention, described preheating can comprise first pulse and second pulse, and wherein, described first pulse has the power level different with the power level of second pulse.

In the described recording method according to the embodiment of the invention, one of described first pulse and described second pulse can have 40% the power level that is not more than recording power.

In the described recording method according to the embodiment of the invention, the data that write down in CD can comprise the data of binarization and at least one of the multi-stage data with three or more values.

In described recording method according to the embodiment of the invention, when being recorded to optical disc data and being the binarization data, a mark in the mark that on recording layer, forms be the most in short-term can execution in step a).

In the described recording method according to the embodiment of the invention, described main pulse can comprise monopulse at least.

In the described recording method according to the embodiment of the invention, the temperature of described recording layer can have the point of temperature jump before reaching the initial markers formation temperature.

In the described recording method according to the embodiment of the invention, the temperature of recording layer is the point of temperature jump after the temperature of recording layer is not less than the initial markers formation temperature not.

And, the invention provides a kind of optical disc apparatus, be used for recording layer identifying recording layer at CD, described optical disc apparatus comprises: optic pick-up is used for by using pulse to launch radiation laser; Regenerator section is used for by the single at least preheat pulse of radiation on CD recording layer is preheating to the temperature less than the initial markers formation temperature, and described preheat pulse has greater than the reproducing power of CD with less than the power level of the recording power of CD; Heating part is used for by the single at least main pulse of radiation on CD recording layer being heated to the temperature that is equal to or greater than the initial markers formation temperature, and described main pulse has the power level identical with the recording power of CD.

In the optical disc apparatus according to the embodiment of the invention, described preheat pulse can have 80% the power level that is not more than recording power.In the described optical disc apparatus according to the embodiment of the invention, described preheat pulse can comprise first pulse and second pulse, and wherein, described first pulse has the power level different with the power level of second pulse.

In the described optical disc apparatus according to the embodiment of the invention, one of described first pulse and described second pulse have 40% the power level that is not more than recording power.

In the described optical disc apparatus according to the embodiment of the invention, the data that write down in CD can comprise the data of binarization and at least one of the multi-stage data with three or more values.

In the described optical disc apparatus according to the embodiment of the invention, when being recorded to optical disc data and being the binarization data, a mark in the mark that forms on recording layer is can carry out described preheating the most in short-term.

In the described optical disc apparatus according to the embodiment of the invention, described main pulse can comprise monopulse at least.

In the described optical disc apparatus according to the embodiment of the invention, the temperature of described recording layer can have the point of temperature jump before reaching the initial markers formation temperature.

In the described optical disc apparatus according to the embodiment of the invention, the temperature of recording layer is the point of temperature jump after the temperature of recording layer is not less than the initial markers formation temperature not.

Description of drawings

The other objects and features of the invention will become more clear from following detailed description when reading in conjunction with the accompanying drawings.

Fig. 1 is the figure of the wave recording of the tactful A of expression;

Fig. 2 is the figure of the wave recording of the tactful B of expression;

Fig. 3 is the figure of the wave recording of the tactful C of expression;

The figure of Fig. 4 reproducing signal that to be expression obtain from the part that has write down classification ripple (stepped wave);

Fig. 5 is expression by using the synoptic diagram of test result of carrying out the power correlativity (dependency) of the whole pulse width in the classification ripple record at the wave recording shown in Fig. 1;

Fig. 6 is illustrated in the figure of test result that carries out the power correlativity of the whole pulse width in the classification ripple record at the wave recording shown in Fig. 2 by using;

Fig. 7 is illustrated in the synoptic diagram of test result of carrying out the power correlativity of the whole pulse width in the classification ripple record at the wave recording shown in Fig. 3 by using;

Fig. 8 is that expression is to the synoptic diagram of introducing the effect of bias power (Pbi) in the waveform recording shown in Fig. 2;

Fig. 9 is the synoptic diagram that is illustrated in the relation between Wt/Lt (it is under the situation of the recorded at random of using the waveform shown in Fig. 2 and 3, at the ratio between the time interval Lt of the whole pulse interval Wt of highest mark and elementary cell length) and the SDR value;

Figure 10 is the synoptic diagram that is illustrated in the relation between Wg/L (it is under the situation of the recorded at random of using the waveform shown in Fig. 2 and 3, at the average groove width Wg of guide groove and the ratio between the elementary cell length) and the SDR value;

Figure 11 is the synoptic diagram that is illustrated in the relation between L/Dp (it is under the situation of the recorded at random of using the waveform shown in Fig. 2 and 3, at the ratio between elementary cell length L and the channel depths Dp) and the SDR value;

Figure 12 is the synoptic diagram that is illustrated in the relation between Pf/Pb (it is under the situation of the recorded at random of using the waveform shown in Fig. 2, at the ratio between recording power Pf and the Pb) and the SDR value;

Figure 13 is the synoptic diagram of x axle that expression is changed to Figure 12 of recording power Pb;

Figure 14 is the synoptic diagram that is illustrated in the relation between Wb/Wt (it is under the situation of the recorded at random of using the waveform shown in Fig. 2, at the ratio between the whole pulse interval Wt of pulse interval Wb and maximum level mark) and the SDR value;

Figure 15 is the synoptic diagram of the change of the real part n of complex index of expression organic material and imaginary part k;

Figure 16 is illustrated in the main absorption band of organic material and the synoptic diagram of the relation between the recoding/reproduction wavelength;

Figure 17 is that the AFM that passes through the part of substrate surface under the situation of the enterprising line item of the obtainable DVD-R of commerce observes the view that obtains;

Figure 18 is illustrated in the main absorption band of organic material and the synoptic diagram of the relation between the recoding/reproduction wavelength;

Figure 19 is illustrated in by using the strategy shown in Fig. 1-3 to carry out the synoptic diagram of the test result of the power correlativity of whole pulse width in the classification ripple record;

Figure 20 is the synoptic diagram that the effect of bias power is introduced in expression;

Figure 21 is the synoptic diagram that is illustrated in the relation between Wt/Lt (it is under the situation of the recorded at random of using the twin-stage ripple (two-step wave) shown in Fig. 2, at the ratio between the time interval Lt of the whole pulse interval Wt of maximum level mark and elementary cell length) and the SDR value;

Figure 22 is the synoptic diagram that is illustrated in the relation between Wg/L (it is under the situation of the recorded at random of using the waveform shown in Fig. 2 and 3, at the average groove width of guide groove and the ratio between the elementary cell length) and the SDR value;

Figure 23 is the synoptic diagram that is illustrated in the relation between L/Dp (it is under the situation of the recorded at random of using the waveform shown in Fig. 2 and 3, at the ratio between the elementary cell length L and the guide groove Dp degree of depth) and the SDR value;

Figure 24 is the synoptic diagram that is illustrated in the relation between Pf/Pb (it is under the situation of the recorded at random of using the waveform shown in Fig. 2, at the ratio between recording power Pf and the Pb) and the SDR value;

Figure 25 is the synoptic diagram that is illustrated in the relation between Wb/Wt (it is under the situation of the recorded at random of using the waveform shown in Fig. 2, at the ratio between the whole pulse interval Wt of pulse interval Wb and highest mark) and the SDR value;

Figure 26 is the synoptic diagram that is illustrated in the relevance between elementary cell length and the many-valued recording impulse position;

Figure 27 is the synoptic diagram that is illustrated in the relation between the many-valued and center of each grade;

Figure 28 be expression according to the third embodiment of the present invention carry out classification ripple record with respect to the phthalocyanine dye medium by using the strategy shown in Fig. 1-3 time the synoptic diagram of test result of power relevance of whole pulse width;

Figure 29 be expression according to the third embodiment of the present invention carry out classification ripple record with respect to the TeO medium by using the strategy shown in Fig. 1-3 time the synoptic diagram of test result of power relevance of whole pulse width;

Figure 30 is the synoptic diagram that the effect of bias power is introduced in expression;

Figure 31 is the synoptic diagram that is illustrated in the relation between Wt/Lt (it is under the situation of the recorded at random of using the twin-stage ripple shown in Fig. 2, at the ratio between the time interval Lt of the whole pulse interval Wt of highest mark and elementary cell length) and the SDR value;

Figure 32 is the synoptic diagram that is illustrated in the relation between Wg/L (it is under the situation of recorded at random, at the average groove width Wg of guide groove and the ratio between the elementary cell length) and the SDR value;

Figure 33 is the synoptic diagram that is illustrated in the relation between L/Dp (it is under the situation of the recorded at random of using the ripple shown in Fig. 2 and 3, at the ratio between elementary cell length L and the channel depths Dp) and the SDR value;

Figure 34 is the synoptic diagram that is illustrated in the relation between Pf/Pb (it is under the situation of the recorded at random of using the ripple shown in Fig. 2, at the ratio between recording power Pf and the Pb) and the SDR value;

Figure 35 is the synoptic diagram that is illustrated in the relation between Wb/Wt (it is under the situation of the recorded at random of using the ripple shown in Fig. 2, at the ratio between the whole pulse interval Wt of pulse interval Wb and highest mark) and the SDR value;

Figure 36 is a synoptic diagram, wherein represent with the wave recording that is overwritten in the invention shown in the Japanese Laid-Open Patent Application 60-150240 in the identical mode of the waveform of the present invention shown in Fig. 1-3;

Figure 37 is a synoptic diagram, wherein represent with the wave recording that is overwritten in the invention shown in the Japanese Laid-Open Patent Application 63-113938 in the identical mode of the waveform of the present invention shown in Fig. 1-3;

Figure 38 is the block scheme of expression according to the configuration of the optical disc apparatus of the embodiment of the invention;

Figure 39 is the multistage figure that is used for descriptive information;

Figure 40 is the figure that is used to illustrate in the configuration of the optic pick-up shown in Figure 38;

Figure 41 is the process flow diagram that is used to illustrate according to the recording processing of the embodiment of the invention;

Figure 42 is the synoptic diagram that is used to illustrate single test zone;

Figure 43 is the oscillogram that is used to illustrate the reproducing signal of test zone;

Figure 44 A-44C is the oscillogram that is used to illustrate the reproducing signal of single test zone;

Figure 45 A-45B is used to illustrate the oscillogram that comprises the reproducing signal under the situation of 10 unit at test zone;

Figure 46 is the synoptic diagram that is used to illustrate the test zone that comprises three unit;

Figure 47 A-47B is the oscillogram that is used to illustrate at the reproducing signal of the test zone shown in Figure 46;

Figure 48 is the process flow diagram that is used to illustrate according to the recording processing of the modification of the embodiment of the invention;

Figure 49 is the synoptic diagram that is used to illustrate at the laser control circuit shown in Figure 38;

Figure 50 is the synoptic diagram that is used for illustrating according to the configuration of the virtual disk that uses in simulation of the embodiment of the invention;

Figure 51 is the table that is used for illustrating according to the characteristic of the virtual disk that uses in simulation of the embodiment of the invention;

Figure 52 is used for illustrating on the virtual disk of simulation and the synoptic diagram of the multi-stage data that writes down in the unit;

Figure 53 is the synoptic diagram that is used to illustrate with respect to the change of the temperature of the recording layer of unit center;

Figure 54 is used for illustrating being included in the preheat pulse that simulation uses and the exomonental synoptic diagram of light of main pulse;

Figure 55 is the synoptic diagram that is used for illustrating in the analog result of the light transponder pulse that uses Figure 54;

Figure 56 is the exomonental synoptic diagram of light that is used to illustrate the only main pulse that is used for the comparison purpose;

Figure 57 is the synoptic diagram that is used for illustrating in the analog result of the light transponder pulse that uses Figure 56;

Figure 58 A is the isothermal map at the exomonental situation lower unit of the light B that uses Figure 54;

Figure 58 B is the isothermal map at the exomonental situation lower unit of the light B that uses Figure 56;

Figure 59 is used to illustrate that recording power at Figure 56 is set to the synoptic diagram of the analog result under the situation of 6.0mW;

Figure 60 is used to illustrate that recording power at Figure 56 is set to the synoptic diagram of the analog result under the situation of 5.5mW;

Figure 61 is used to illustrate that the light exomonental first of Figure 54 revises the synoptic diagram of example;

Figure 62 is the synoptic diagram that is used for illustrating in the analog result of the light transponder pulse that uses Figure 61;

Figure 63 is the process flow diagram that is used to illustrate according to the recording processing of the embodiment of the invention;

Figure 64 A-64D is used for the temperature of declare record layer and at the synoptic diagram of the relation of the time in the past of beginning after the radiation;

Figure 65 is used to illustrate that the light exomonental second of Figure 54 revises the synoptic diagram of example;

Figure 66 is used to illustrate that the light the exomonental the 3rd of Figure 54 revises the synoptic diagram of example;

Figure 67 is used to illustrate that the light the exomonental the 4th of Figure 54 revises the synoptic diagram of example;

Figure 68 is used to illustrate that the light the exomonental the 5th of Figure 54 revises the synoptic diagram of example;

Figure 69 is used to illustrate that the light the exomonental the 6th of Figure 54 revises the synoptic diagram of example;

Figure 70 is used to illustrate the exomonental synoptic diagram of first light that comprises preheat pulse under the situation of using the binary recording type;

Figure 71 is used to illustrate the exomonental synoptic diagram of second light that comprises preheat pulse under the situation of using the binary recording type; And

Figure 72 is used to illustrate the exomonental synoptic diagram of the 3rd light that comprises preheat pulse under the situation of using the binary recording type.

Embodiment

Describe the present invention in detail according to described embodiment in the accompanying drawings.

As invention 1, these inventors find to exist following effect: be set to 0.5 or greater than 0.5 and always introduce the power that adds bias power (Pbi) to reproducing power (Pr) in writing time by the ratio (Pbi/Pr) with reproducing power (Pr) and bias power (Pbi), improved recording sensitivity and reduced the SDR value.Preferably, Pbi/Pr is 1 or greater than 1, more preferably, Pbi/Pr is between 2 and 4.But because best Pbi/Pr changes along with the reflectivity of medium and writing speed, when carrying out when of the present invention, the best Pbi/Pr of every kind of medium is calculated in expectation.Reproducing power among the present invention is the laser power that is used to read when printing medium reproduces, and the power of always introducing in the present invention is the power that bias power is added to above-mentioned reproducing power.Fig. 1-3 is described to invent the example of 1 waveform.In these accompanying drawings, Pf is the recording power of first half, and Pb is the recording power of latter half, and Wf is the burst length width of the recording power of first half, and Wb is the burst length width of the recording power of latter half.

And, as invention 2, as the 1/e of the center intensity that is set to laser (diameter of laser beam) D ²The ratio of length L of diameter and the record unit's (elementary cell) that is used for multistage record mark of light beam be the scope of D/L＞1 and when the elementary cell of the length that is shorter than beam diameter is carried out multi-level recording, these inventors find to exist following effect: be set to 0.5 or greater than 0.5 and always introduce the power that bias power (Pbi) is added to reproducing power (Pr) when the record by the ratio (Pbi/Pr) with reproducing power (Pr) and bias power (Pbi), improve recording sensitivity and reduction SDR value.Preferably, Pbi/Pr is 1 or greater than 1, and more preferably, Pbi/Pr is between 2 and 4.But because best Pbi/Pr changes along with the reflectivity of medium and writing speed, when carrying out when of the present invention, the best Pbi/Pr of every kind of medium is calculated in expectation.

SDR is the coefficient (index) that is equal to the shake in 2 value records.When by the multi-stage data level mi (m that constitutes by the α kind ₀, m ₁, m ₂..., m _α-2, m _α-1) each order of reflection be set to Ri (R ₀, R ₁, R ₂..., R _α-2, R _α-1) and the standard deviation of the order of reflection Ri in multistage level mi when being set to σ mi, it is the value that is provided by following formula.

SDS＝(σm ₀+σm ₁+σm ₂+…+σm _α-2+σm _α-1)/[(1+α)|R ₀-R _α-1]

In invention 3, except inventing 2 requirement, use the whole burst length width W t of maximum level mark and elementary cell length time width Lt ratio Wt/Lt at least the strategy between 0.3-0.8 come executive logging.By so carrying out,, can reduce the SDR value especially for the random signal record.

Record and reproducting method for invention 3, in invention 4, executive logging on the recordable type optical recording media under the condition of the track space 0.25-0.5 of guide groove micron, degree of depth 15-150nm and average well width 0.15-0.35 micron, and use the laser beam in the blue wavelength region under 450nm, the reflectivity of non-record is 2-50%.In this case, can be especially reduce the SDR value at random signal record.The lower limit that does not have wavelength, if exploitation LD, though then can unrestrictedly use the short wavelength, but under precondition, BeMgZnSe is the direct change II-VI family composite semiconductor with big forbidden zone width of 2.68-4.72 electron-volt, if and with phosphoric acid gallium (GaP) and silicon (Si) as backing material, then can cover the 295-345nm of ultraviolet domain.

And as invention 5, preferably, the average groove width Wg of guide groove and the ratio Wg/L of length L of record cell (elementary cell) that is used for multistage record mark are between 0.7 to 1.5.If it is big that the influence that Wg/L less than 0.7, then crosstalks becomes, and if Wg/L greater than 1.5, then the interference between code becomes big.

And as invention 6, preferably, the ratio L/Dp of depth D p that is used for the length L of record unit's (elementary cell) of multistage record mark and guide groove is between 3 and 8.If L/Dp is less than 3, then the interference between code becomes big, and if L/Dp greater than 8, SDR value variation then.

In invention 7, use by two-stage or more than the strategy that the different recording power of two-stage constitutes and come executive logging.

Though these inventors find that also may and make interference between code diminish by each record mark by the chopped pulse width reduces the SDR value, but must improve recording power, and the sensitivity reduction is so that the modulation that pulse width is little and acquisition is equal to.Therefore, as the result of examination, find to obtain good SDR value and non-desensitization according to the condition of invention 7.

For example, as invention 8, if described recording power is a twin-stage, and the strategy of ratio Pf/Pb between 0.3-1 of the recording power (Pf) of use first half and the recording power (Pb) of latter half comes executive logging, then can easily obtain above-mentioned effect, but, when enlarging the recording power Pf of first half, then cannot see most effects of desensitization.Though from 0.3 to 1 scope shows good SDR value, more preferably from 0.4 to 0.9 scope.The example of the waveform of invention 8 is Fig. 2.Though the expectation first half is identical burst length width as described in the invention 10 of back with latter half, if first half and latter half are divided into the degree that does not influence recording characteristic, then it will be satisfied.

In invention 9, the strategy of ratio Wb/Wt between 0.3 and 0.8 of the whole burst length width W t of the recording power of the latter half of use burst length width W b and maximum level mark comes executive logging.By doing like this, still can obtain SDR value preferably.In invention 10, executive logging, thus, the transfer point of recording power (Pb) that is used for the recording power (Pf) of the first half of two-stage and latter half in the recording power is corresponding to the center of elementary cell.In other words, because it is desirable will being arranged on the center of each elementary cell by the multilevel signal of the inventive method record, therefore for the relevance of elementary cell width and multi-level recording pulse position, expectation makes the center of elementary cell with consistent at transfer point Pf and Pb shown in Figure 26, thus, multilevel signal is set at the center of each elementary cell, and shows good SDR value.The multilevel signal of Figure 26 shows 8 values, and ML (multistage) is between 0 and 7.

By inventing 10, figure 27 illustrates the effect that the multi-level recording signal is disposed in the center of elementary cell.Though this figure uses oscillograph to show the multilevel signal of each grade of the elementary cell in layer, but the multilevel signal of each grade is consistent for the center of elementary cell, and can understand, as invention 10, there is big effect position by comprehensive (uniting) signal.

In invention 11, executive logging on the recordable type optical recording media, described recordable type optical recording media has the thin layer (RO layer) (R is one or more elements of selecting, and O expresses oxygen) of each element that comprises R and Q on its substrate at least from the group that is made of Y, B, I, In and lanthanide series) and the thin layer of organic material.The main pigment that uses is used as organic material.

These inventors use the invention about the recordable type optical recording media in advance, and wherein, the laser by blue region also may write down and reproduce (number of patent application 2003-110867 and number of patent application 2003-112141).Sketch details subsequently once more.

What need is, the organic material that uses for the recording layer of the recordable type optical recording media that is used for blue laser, and with respect to blue laser wavelengths, any material that selective light characteristic and decomposition behavior are suitable.In order to improve reflectivity in non-when record, and, select the record-playback wavelength to make it can be positioned at the edge of long wavelength's side of big absorption region in order to decompose organic material by laser emission and to make it produce big variation in refractive (it obtains the tone reversal of big degree by this thus).This is because the edge of long wavelength's side of the big absorption region of organic material is used as the wavelength region may with medium absorption coefficient, and as a result of obtains big refraction coefficient and (see also Figure 15.In the recordable type optical recording media that its traditional organic material is a recording layer, record and playback wavelength are set to oblique line (slash) part in Figure 15).

But, any organic material that does not also have discovery to have the value that can use the light characteristic on blue laser wavelengths.Must make that molecular structure (frame) is little or dwindle conjugated system so that acquisition has the organic material near the uptake zone of blue laser wavelengths, this is because the reduction of absorption coefficient is the reduction of refraction coefficient (refractive index).In other words, also may have the many organic materials and the control absorption coefficient that have near the uptake zone of blue laser wavelengths, this is because it is not big refractive index, and the tone (tone) that therefore can not obtain big degree changes.

And, in traditional recordable type optical recording media, by carrying out record because of the decomposition of organic material and the change of the rotten refractive index that causes and the distortion of substrate.For example, [it is the figure by the surface observation of the substrate of the part of AFM (atomic force microscope) from be recorded to commercial CVC-R] as shown in Figure 17, substrate is changing in the side of reflection horizon, produces the degree of the tone reversal that causes owing to this distortion thus.

And, in having traditional recordable type optical recording media of organic material, as shown in Figure 16, because the main uptake zone of organic material is present near the recoding/reproduction wavelength, therefore the wavelength dependency of the optical constant of described organic material uprises (optical constant changes considerably along with wavelength), exists such as recording sensitivity, the tone reversal degree, recording characteristic of shake and error rate and so on and reflectivity are with respect to poor (solid difference) record that causes of the reality by laser and the change of playback wavelength, change of environment temperature etc. and big change takes place.But, when distortion is the main body of recording principle, even obtained good shake and tone reversal degree, because interference between record mark also will become greatly, so the problem that exists the tolerance limit (margin) of various records and reproducing characteristic to narrow down.Therefore, produce problem in the recordable type optical recording media that big tonal variation degree just is to use blue wavelength territory laser with the little record mark of deflection.

In addition, because organic material does not have enough receptivities for recording light, so it can not make the thickness attenuation of film of organic material.Therefore, must use substrate with dark point (deep spot) (because organic material forms by spin coating method usually, so it buries organic material as in the deep trouth, and make film thickening).Therefore, the formation with substrate of deep trouth becomes very difficult, and it becomes the factor of reduction as the quality of optical recording media.

And, therefore because can not make the thickness attenuation of the film of organic material, there is a problem: recording power tolerance limit (margin) etc.s narrow down (write down and the various tolerance limits of reproducing characteristic are narrow problems).

As theme of the present invention is following (A)-(D) by the point that the little record mark of deflection produces big tone reversal degree promptly.

(A) layer with light absorption function do not make cause decompositions, rotten, form and change etc., and the layer with light absorption function itself does not make its earth change.

(B) layer with light absorption function do not make cause decompositions, rotten, form change etc., and many heats are not sent to the adjacent layer of easy change, such as substrate.(heat that produces in having the layer of light absorption function does not consume in the layer with light absorption function, the distortion of substrate etc. etc. might be suppressed for little thus).

(C) even it has reduced deflection, in order to produce enough tone reversal degree, it has the layer that causes that big optical constant changes.

(D) even it has reduced deflection, in order to produce enough tone reversal degree, the recording principle that layer is connected with adjacent layer.

Have the result of this materials with function as examination, the recordable type optical recording media of combination of finding to have the film of the film that is made of the certain material by the present invention's 11 appointments and described organic material is effectively.By using this combination, and compare in the past, might make the contribution of being out of shape in the record mark seldom, and can solve the above problems.

In traditional recordable type optical recording media, the decomposition by organic material and rotten has reduced the absorption coefficient in record and the playback wavelength, and by using the big refraction index changing that causes thus to produce the tone reversal degree.

On the other hand, in the recordable type optical recording media of invention 11, traditionally, the function that main heat produces layer produces layer and separates by originating to decompose the organic film as the recording layer function that causes with rotten variations in refractive index (real part of complex index) from the heat that is caused by the light absorption function, and the RO film with light absorption function that is separated with organic material film is provided.This is the feature of invention 11.

In invention 11 recordable type optical recording media, form record mark according to the recording principle of following A-I.

A) revise the RO film.

B) complex index of change RO film.

C) composition of change RO film.

D) dissolving RO film.

E) component in the RO film is diffused into adjacent layer.

F) crystal structure of change RO film.

G) volume of change organic material film.

H) complex index of change organic material film.

I) make and in organic material film, form porous part.

Particularly, in invention 11 recordable type optical recording media, expectation mainly is formed for the various changes (being above-mentioned A) of state of RO film to I)) record mark.Particularly, B) to F) be preferred.For example, because can use the change, dissolving of composition or to adjacent layer diffusion component, so the complex index of RO film can change a lot.And, because can be so that uncertain and can cancel multiple (multiplex) reflecting effect, even therefore little distortion also can obtain big tone reversal degree with the layer linkage interface of adjacent layer.

In other words, by using above-mentioned recording principle, it has following characteristic (1) to (7), and can realize can producing by the record mark of distortion in a small amount the recordable type optical recording media of big tone reversal degree.(1) even in the blue laser wavelengths territory (500nm or less than 500nm), particularly with the approaching wavelength domain of 405nm in, also can easily realize the record of 2 value records and the high density recordable type optical recording media of reproduction.(2) even in the blue laser wavelengths territory (500nm or less than 500nm), particularly with the approaching wavelength domain of 405nm in, also can easily realize the record of multi-level recording and the high density recordable type optical recording media of reproduction.

(3) even in the blue laser wavelengths territory (500nm or less than 500nm), particularly with the approaching wavelength domain of 405nm in, be adapted to pass through the record that passes through signal processing system of PRML system and the high density recordable type optical recording media of reproduction.

(4) has the recordable type optical recording media of big jitter toleration, error rate etc. for the change of recording power.

(5) has recordable type optical recording media for record and the change of playback wavelength such as little changes of recording characteristic such as recording sensitivity, tone reversal degree, shake, error rate, reflectivity.

(6), also can easily realize the recordable type optical recording media that writes down and reproduce even substrate has shallow slot and superior transmission characteristic.(7) can record the recordable type optical recording media of terrace part (land part).

1.RO the function of layer

In the recordable type optical recording media of invention 11, the RO film has the key light absorption function.

Because being the material that shows normal distribution, this RO film (is similar to organic material, because it is not the material that has big absorption region in particular range of wavelengths, therefore the wavelength dependency of complex index is little), therefore, it can greatly solve traditional problem, promptly, has big change such as recording characteristics such as recording sensitivity, tone reversal degree, shake, error rate, reflectivity for the record that causes owing to the individual difference of laser, the change of environment temperature etc. and the change of playback wavelength.

In traditional recordable type optical recording media, because the function of organic material film dual-purpose recording layer and light absorbing zone, therefore,, has big refractive index n and less absorption coefficient k is the necessary condition of organic material for the record-playback wavelength.Therefore, in order to reach the decomposition temperature of organic material, need the thickness (and for the optical recording media of phase-change type, the degree of depth of the groove on substrate is very dark) of thicker film.

But, in the recordable type optical recording media of invention 11, because organic material film does not mainly need to have light absorption function or writing function, so and past, the thickness of the film of organic material can be thinner.

And, because might make that the film of organic material is thin, therefore can use in transport property (manufacturing characteristic) and go up substrate superior and that its groove is shallow, while and past, the signal quality of optical recording media improves widely, can be easily and make (processing) substrate cheaply.

And, by above-mentioned recording principle, being difficult to when reproducing, be subjected to the influence of the shape of substrate groove, the tolerance level that substrate shape is changed is high, and and past, can be easily and make described substrate cheaply.

And, because might make that the film of organic material is thin, therefore might enlarge recording power tolerance limit etc.

Described RO film also has light absorption function and writing function.

Particularly, RO film itself causes the following change of state by the light absorption function of RO film.

(1) distortion (still, compare with tradition, deflection is few)

(2) change of complex index

(3) change of composition

(4) dissolve (dissolution)

(5) component is to the diffusion of adjacent layer

(6) change of crystal structure

Therefore therefore, because it also has writing function for 500nm or littler record and playback wavelength when having the light absorption function, expectation is selected to be used as R for the element that 500nm or littler record and playback wavelength have the light absorption function.

And, for cause that big complex index changes, the variation of composition and dissolving, perhaps make to constitute Elements Diffusion to adjacent layer, for R, in the RO film, expectation selects to have more low-melting element.

From the point of view, one or more elements of selecting from the group that is made of Y, Bi, In and lanthanide series are used as R.O represents oxygen.

Though the present invention relates to that main the recordable type optical recording media of recordable RO film embodies the strategy of good shake or SDR value by blue domain laser for having, the present invention is also effective in the laser log of the big wavelength domain except the blue wavelength territory.

2. the function of organic material film

The function of organic material film roughly can be divided into the generation function of (a) tone reversal degree, (b) function of compensation reproducing signal waveform, (c) function of control such as reflectivity and tracking signal, and (d) control function of recording sensitivity.

For the film of organic material,, realize the generation function (a) of tone reversal degree by causing following phenomenon.

The volume of the film of organic material changes along with record.

The complex index of the film of organic material changes along with record.

By record, in the film of organic material, form porous part.

Reception changes by the state of the RO film that record causes.

Receive the distortion in reflection horizon.

The change of change, the composition of distortion, complex index, dissolve, component is represented as " change of the state of RO film " to the diffusion (mixing) of adjacent layer and the change of crystal structure at this in explanation.

(b) function that is used to compensate the waveform of reproducing signal is meant: though the reproducing signal waveform is only obscured [record polarity can not easily change along with from high to low single polarity] by the RO film probably, but it is can be so that the reproducing signal waveform becomes the function (usually, record polarity is high to low) of expectation waveform by providing organic material film to be used as adjacent layer.

Because organic material film can be controlled at its complex index and thickness in the wide range, therefore very clear have (c) control function, such as reflectivity and tracking signal.

Function about (d), in the recordable type optical recording media of invention 11, though the light absorption function mainly is provided to the RO film, but recording sensitivity is controllable, is used as light absorbing zone because can organic material film be assisted by the complex index (the particularly imaginary part of complex index) of control organic material film.

In the recordable type optical recording media of invention 11, in order to expand the range of choice of organic material widely, even it is the recordable type optical recording media that further uses organic material film, in order to make near the little variation of record and the complex index of playback wavelength (make wavelength dependency little), for organic material film, expect that the long wavelength side that main absorption region is positioned at described record and playback wavelength (sees also Figure 18.Oblique line partly shows record and playback wavelength).

When using organic material film to assist,, expect its value less than the imaginary part of the complex index of RO film for value in the imaginary part of the record of described organic material film and the complex index in the playback wavelength as light absorbing zone.Reason is as follows.Make the value of the imaginary part of the complex index in the record-playback wavelength of organic material film outside necessary scope, worsen wavelength dependency.

And, when using organic material film to assist as light absorbing zone, for organic material film, expect that main absorption region is positioned at the long wavelength side of record and playback wavelength, and also expectation has the absorption region that does not belong near the main absorption region of record and playback wavelength.

Invention 12 is characterised in that the RO film of the recordable type optical recording media of invention 11, it comprises that described group formation is Al, Cr, Mn, Sc, In, Ru, Rh, Co, Fe, Cu, Ni, Zn, Li, Si, Ge, Zr, Ti, Hf, Sn, Pb, Mo, V and Nb from one or more element M of following group selection.Particularly, at the R that forms so-called Garnett structure ₃M ₅O ₁₂Under the situation about forming,, therefore also may suppress the distortion of RO film itself or such as the distortion of adjacent layers such as substrate because can improve the hardness of material and the hardness of RO film increases, and can be so that the interference between record mark is little.

And for the further raising of storage stability, expectation is chosen as R with Bi.Though C, Si, Ge, Sn, Pb are described to 4B family element, Si and Ge are special expectations.And Fe, Co, Cu, Ni, Zn are described to transition metal, but Fe and Cu are special expectations.

And, under the situation of BiOM layer, by the behavior of additional elements M, cause complex index big change, formation change and dissolve, the ability that perhaps is used to make the adjacent layer diffusion constitute element further improves.

Several advantages of the material of each element that use comprises R and O---further being R, O and M---are as follows.(1) can be by making it improve the hardness (also may suppress the distortion of RO film itself or the distortion of the adjacent layer such as substrate) of layer for oxide.

(2) can be by making it keep stability for oxide improves.

(3) can be by comprising that having for wavelength region may is that the element---such as Bi---of the high absorptivity of 500nm or littler light improves recording sensitivity.

(4) by comprising the low-melting element such as Bi or cause the element of diffusion easily, though do not follow big distortion, can be so that form the record mark that produces big tone reversal degree.

(5) can form good film by the method for vapor-phase growing such as sputter.The thickness of RO film has the 20-500 dust of expectation.

As invention 13 and 14, the composition that uses these RO films and organic material film is effectively in the recordable type optical recording media, and strategy that can the application of the invention good multi-level recording of realizing having low SDR value.It is formed is at the layer in the film of RO at least, organic material film and reflection horizon on its substrate in regular turn or is reflection horizon at least, organic material film, RO layer and tectal layer on its substrate in regular turn.

In invention 15, it is record on the recordable type optical recording media, described recordable type optical recording media has thin layer on its substrate (below be called as the RO layer) and dielectric layer, each element that described thin layer comprises R and O at least (still, R is one or more elements of selecting from the group that comprises Y, Bi, In and lanthanide series), described dielectric layer has the ZnS as principal ingredient.Here, principal ingredient represents to comprise at least the ZnS of 50mol%.

Foregoing invention 11 is intended to have the recordable type optical recording media of organic material film, and in invention 15, it does not have organic material film, but the recordable type optical recording media of the structure that it is intended to use dielectric layer---ZnS is its principal ingredient---.About other recording principle and details, identical with invention 11.

Identical with invention 12, invention 16 is characterised in that the RO film of recordable type optical recording media, it comprises that described group formation is Al, Cr, Mn, Sc, In, Ru, Rh, Co, Fe, Cu, Ni, Zn, Li, Si, Ge, Zr, Ti, Hf, Sn, Pb, Mo, V and Nb from one or more element M of following group selection.For invention 16, details is identical with invention 12.

As invention 17 and 18, using these RO films and ZnS is that being formed in the recordable type optical recording media of dielectric layer of principal ingredient is effectively, and strategy that can the application of the invention good multi-level recording of realizing having low SDR value.It constitutes is the film of RO at least on its substrate, dielectric layer that ZnS is principal ingredient and the layer in reflection horizon in regular turn, or is the reflection horizon at least on its substrate, dielectric layer, RO layer and the tectal layer that ZnS is principal ingredient in regular turn.

According to the present invention, can provide record and reproducting method by simple recording impulse strategy, wherein, 2 values (scale-of-two) record or three values or more many-valued multi-level recording are possible.

Although comparing embodiment and example are described more specifically invention, the invention is not restricted to these embodiment.

First embodiment

Use sputter that the ZnS-SiO of 65nm is provided on the polycarbonate substrate (0.6mm is thick) with guide groove (the 50nm degree of depth) in regular turn ₂The Bi of thin layer and 12nm ₂O ₃Thin layer.Then; in the above; use spin coating method to form organic material film (average thickness is about 30nm); described organic material is made of at the dyestuff down chemical constitution; use sputter that the Ag reflection horizon of 150nm is provided then in the above; provide about 5 microns protective seam in the above with spin coating method then; described protective seam is by the resin (SD1700 of UV cured type; Dainihon ink chemical industry inc. (Dainihon ink chemistry industrial group)) constitutes, process the recordable type optical recording media thus.

Chemical constitution 1

For above-mentioned optical recording media, carry out multi-level recording.In this case, carry out the many-valued record of 8 values (0 grade to 7 grades).In described implementation, by being that 0.24 micron, the time width of elementary cell length are that 48ns, clock frequency are that 2.5GHz, record and reproduction linear velocity are to use SONY techtronics under the 5.0m/s in elementary cell length (record cell of record mark), the AWG-610 of Inc (technology company of Sony) operates the CD assessment apparatus DDU-1000 (wavelength: 405nm of Pulstec Industry Inc, NA:0.65, the center intensity of the laser (1/e of beam diameter ²): use about 0.55 micron and come setting recording strategy (the brightness waveform control of laser when record)).Reproducing power is 0.5mW, and is as described below, and (Pr+Pbi) is arranged on 1.5mW with normal boot power.1/e for laser center intensity ²Beam diameter (lasing beam diameter) D and the ratio of the elementary cell length L of multi-level recording mark be scope at 1＜D/L.

At first, in the wave recording shown in Fig. 1-3, the classification ripple strategy shown in Fig. 4 is estimated medium, is good so which waveform it can specify.Each wave recording of the present invention is gone up at described normal boot power (Pr+Pbi) and is set up.

Fig. 4 is to be example under 8 the situation in multistage level.To write down the multistage level m of continuous 5 record units (dummy unit) ₀The multistage level m of (0 grade) and continuous 32 record units (dummy unit) _iPattern (pattern) as the basis, then will be for all multistage level m _i(i=0-7) model selection of having write down above-mentioned basic model records in the optical recording media then as test pattern, and Fig. 4 is the example that is used to reproduce the part that has write down test pattern on it.

This test pattern is in the state that the interference between the code clearly fixed, and multistage level m ₀(0 grade) is to multistage level m ₇(7 grades) show the regular reflection level.

For the multistage level m that judges rightly _iThe order of reflection, in continuous several times sampling, expectation selects to be used to cover multistage level m _i(this test pattern is for example, when using oscillograph to observe, can observe this multistage level m to the test pattern of continuous a plurality of record units _iBe in about rectilinear form) so that it can be to be used to obtain identical multistage level m _iThe length of the order of reflection.For example, preferred following test pattern: go up the multistage level of duplicate record m at a plurality of continuous record cells (dummy unit) _i, and (multiplicity) x (length of record unit) becomes the diameter greater than playback light.

Though it is considered at multistage level m _iAll insert multistage level m during each the variation by above-mentioned test pattern ₀Pattern, but insert this m ₀Not indispensable.Yet, by inserting m ₀, multistage level m ₁Conversion become clear, thus, have the sampling timing accurate advantage that becomes.Can suppress as multistage level m ₁The interference between code that produces during conversion, and have the further multistage level of improvement m ₁The advantage of homogeneity.Below, the logging mode of Fig. 4 waveform is called as classification ripple record.In classification ripple record, because the interference between code is few, owing to generally can obtain to be lower than the SDR value of random wave record, so the SDR of classification ripple record can compare with the SDR of random wave record.

The time width of elementary cell length is corresponding to 48ns, and condition setting is as follows.Be used to form the pulse length value of setting (value of setting of the time width in being applied to the pulse voltage of laser diode of the laser of level 1 (little to second size and/or have the record mark of the degree of depth).After, it is identical) be 7.2ns, the pulse length value of setting that is used to form the laser of level 2 is 10.4ns, the pulse length value of setting that is used to form the laser of level 3 is 12.8ns, the pulse length value of setting that is used to form the laser of level 4 is 15.2ns, the pulse length value of setting that is used to form the laser of level 5 is 16.8ns, the pulse length value of setting that is used to form level 6 laser is 19.2ns, and the pulse length value of setting of laser of (full-size and/or have the record mark of the degree of depth) is 24ns to be used to form grades 7.

Note below in the accompanying drawing " whole pulse width " is divided into 100 with the time width of elementary cell length, and is the value of setting of whole burst length width of their level 7 (maximum level).That is, be that pulse length value of setting of 48ns and level 7 is in the example of 24ns at the time width of elementary cell length, whole pulse width is 50.And, when whole pulse width is changed (variation), change pulse length value of setting of other grades 1-6 pro rata with it.

In Fig. 5-7, use and carry out classification ripple record, and show investigated power dependent about various whole pulse widths at the wave recording shown in Fig. 1-3.Pf in the accompanying drawing, Pb, Wf and Wb have identical implication with the situation of Fig. 1, and also with accompanying drawing described later in similar.At this, the ratio Wb/Wf of pulse width is 1/1, and power ratio Wb/Wf is 2/1, is 1/2, is 1/1 for Fig. 7 for Fig. 6 for Fig. 5 respectively.

If the same ratio of whole pulse width is these ratios relatively, then sensitivity finds that to serve as good in regular turn the square wave strategy is sensitiveer than twin-stage ripple strategy in Fig. 7, Fig. 6 and Fig. 5.But best SDR value (low value) is indicated among Fig. 6, at this moment, the strategy of similar and Fig. 2, the recording power Wb of latter half is big.Under the situation of Fig. 2 strategy, the strategy of image pattern 1 like that, its recording power than first half is the sensitivity of height more under the big situation, and the SDR value also is low.

Fig. 8 shows the effect in the waveform recording of bias power (Pbi) introducing Fig. 2.Numeral among the figure therefrom obtains the recording power (mW) of the best SDR value of each bias power, and comes executive logging by the classification ripple.Being used for carrying out the reproducing power (Pr) of following the tracks of in when record also can be a kind of of bias power, for normal introducing bias power of the present invention, has used than big what the expression of reproducing power.Therefore, the numerical value of the transverse axis of Fig. 8 is that the reproducing power numerical value of this test of deduction from actual normal boot power (Pr+Pbi) is the bias power value of 0.5mW.

According to Fig. 8, though when the whole burst length width of maximum level mark be 50 and 60 any one the time, by introducing bias power, it expresses power reduction and the sensitivity improving of showing best SDR value.Discovery SDR value at that time is equal to or reduces.For bias power, expectation is introduced than the big power 0.25mW of reproducing power or greater than 0.25mW, preferably 0.5mW or greater than 0.5mW, more preferably from 1.0mW to 2.0mW.In other words, preferably, the ratio Pbi/Pr of reproducing power (Pr) and bias power (Pbi) is 1 or greater than 1, more preferably, described ratio is between 2 and 4.If Pbi/Pr surpasses 4, then reflectance varies produces on level 0, and SDR value variation greatly.But this value is an extreme numerical value in this embodiment, and particularly, maximal value is subjected to writing down the influences such as sensitivity with reproduction laser light wavelength, record and reproduction speed, reflectivity, medium.But, when Pbi/Pr is 0.5 or when bigger at least, have clearly effect with conditional independence.

Fig. 9 shows the ratio (Wt/Lt) of time width (Lt) of the whole pulse width Wt of the maximum level mark in the recorded at random that the twin-stage ripple (8.5mW) with the square wave (6.5mW) of Fig. 3 and Fig. 2 writes down and elementary cell length and the relation between the SDR value.Described bias power has been introduced the value than the big 1.0mW of reproducing power.In the twin-stage ripple of Fig. 2, power ratio Pb/Pf is 1/2.

As can be as can be seen from Figure 9, at the whole burst length width W t of maximum level mark is that time width Lt with 0.24 micron elementary cell length carries out 30～80 o'clock in 100 five equilibriums, and two kinds of strategies all demonstrate good SDR value in from 0.3 to 0.8 scope.Preferred scope is between 0.35 and 0.7.

And in various factors, in order to improve the characteristic of multi-level recording, 0 average recess width Wg of guide groove and the relation between the elementary cell length L are very important.

Figure 10 shows in the recorded at random that the twin-stage ripple at the square wave that uses Fig. 3 and Fig. 2 writes down average groove width Wg and the ratio (Wg/L) of elementary cell length (L) and the relation between the SDR value at guide groove.1.0mW bias power be introduced into.Described elementary cell length is fixed on 0.24 micron, and the average groove width Wg of guide groove changes between 0.5 and 1.8 micron.

As finding out in Figure 10, SDR shows good value between 0.7 and 1.5, but outside this scope, described value is variation promptly.

Similarly, in order to improve the characteristic of multi-level recording, be very important in the depth D p and the relation between the elementary cell length L of guide groove.

Figure 11 shows in the recorded at random that the twin-stage ripple at the square wave that uses Fig. 3 and Fig. 2 writes down in the ratio (L/Dp) of elementary cell length (L) and channel depths (Dp) and the relation between the SDR value.1.0mW bias power be introduced into.Described elementary cell length is fixed on 0.24 micron, and the degree of depth Lp of guide groove changes between 25 and 120 microns.

As can in Figure 11, finding out, SDR L/Dp 0.7 and 1.5 between show good value, but outside this scope, described value is variation promptly.Preferably, L/Dp is between 4 and 7.

Figure 12 shows recording power Pf and the ratio (Pf/Pb) of Pb and the relation between the SDR value in the recorded at random that the twin-stage ripple that uses Fig. 2 writes down.1.0mW bias power be introduced into.Elementary cell length is 0.24 micron, and the whole burst length width W t of maximum level mark is set to 50, and the time width Lt that is about to elementary cell length carries out half behind 100 branches such as grade, and the ratio of pulse width Wb/Wf is set to 1/1.

Figure 13 uses the data identical with Figure 12, and the x axle is replaced with recording power P, rather than Pf/Pb, so Figure 13 is corresponding to figure Figure 12 is right and that reverse in a left side.

As can in Figure 12, finding out, the SDR value Pf/Pb 0.3 and 1 between show good value.Particularly, the SDR value Pf/Pb 0.4 and 0.9 between show lower value, and recording power reduces when becoming big along with described value.That is, recording sensitivity improves.

Figure 14 shows in the recorded at random that the twin-stage ripple that uses Fig. 2 writes down in the ratio (Wb/Lt) of the burst length of maximum level mark width W b and whole burst length width (Wt) and the relation between the SDR value.Make bias power than the big 1.0mW of reproducing power.Elementary cell length is 0.24 micron, whole burst length width W t be set to time width Lt with elementary cell length carry out behind 100 branches such as

grade half

50 or 60, and the ratio of recording power Pf/Pb is set to 1/2.And, use the classification waveform of Fig. 4 to carry out this test.

As can in Figure 14, finding out, the SDR value Wb/Wt 0.3 and 0.8 between show good value.Particularly, the SDR value Wb/Wt 0.4 and 0.8 between show lower value, and recording power lowers when becoming big along with described value.That is, recording sensitivity improves.

In addition, even when using Y ₂O ₃Layer, In ₂O ₃Layer is substituted in the Bi of the optical recording media that uses in the above-mentioned test ₂O ₃During layer, also can obtain and top identical result.

And, work as Bi ₂O ₃Layer also obtains identical result when comprising one or more element M of selecting from the group that is made of Al, Cr, Mn, Sc, In, Ru, Rh, Co, Fe, Cu, Ni, Zn, Li, Si, Ge, Zr, Ti, Hf, Sn, Pb, Mo, V and Nb.

And layer formation of its on the substrate is inverted, and uses sputter that the Ag reflection horizon of 150nm is provided on the polycarbonate substrate with guide groove (50nm is dark) (0.6 millimeters thick).Then,, use spin coating method to form the film (average thickness is about 30nm) of organic material in the above, it is made of the pigment of aforesaid chemical constitution, then, uses the Bi that 12nm is provided above sputtering in regular turn ₂O ₃The ZnS-SiO of thin layer and 65nm ₂Thin layer, then, the overlayer that will have 0.08mm thickness is pasted with the double-sided adhesive sheet with 0.02mm thickness, makes recordable type optical recording media of the present invention thus.

For described optical recording media, use CD assessment apparatus DDU-1000 (wavelength: 405nm, the numerical aperture: 0.65) come of Pulstec Industry Inc (Pulstec industrial group) from the cover layer side executive logging.Even the formation of substrate changes in proper order and uses the laser with large-numerical aperture value, also can obtain effect of the present invention similarly.And, in the multi-level recording identical with present embodiment, in the feature medium, wherein the track space of guide groove between 0.25 and 0.5 micron, the degree of depth 15 and 150nm between, average groove width between 0.15 and 0.35 micron and the reflectivity in the non-recording status between 2 and 50%, can obtain effect of the present invention similarly.

Second embodiment

Use sputters at the Bi that 20nm is provided on the have guide groove polycarbonate substrate (0.6mm is thick) of (degree of depth 26nm) successively ₂O ₃The ZnS-SiO of thin layer, 65nm ₂The Ag reflection horizon of thin layer and 150nm.Then, use spin coating method that about 5 microns protective seam is provided in the above, it is made of uv-hardening resin (SD1700, Dainihon ink chemical industry inc.), makes the recordable type optical recording media thus.

For above-mentioned optical recording media, carry out multi-level recording.In this case, carry out the many-valued record of 8 values (level 0 is to level 7).In described implementation, by using in elementary cell length (record cell of record mark) is that 0.24 micron, the time width of elementary cell length are to use SONY techtronics under the 5.0m/s as 48ns, clock frequency as 2.5GHz, record and reproduction linear velocity, the AWG-610 of Inc (technology company of Sony) operates the CD assessment apparatus DDU-1000 (wavelength: 405nm of Pulstec Industry Inc., numerical aperture: 0.65, the center intensity of the laser (1/e of beam diameter ²): use about 0.55 micron and come setting recording strategy (the brightness waveform control of laser when record)).Reproducing power is 0/5mW, and is as described below, and normal boot power (Pr+Pbi) is set at 1.5mW.The 1/e of laser center intensity ²The ratio of the elementary cell length L of beam diameter (lasing beam diameter) D and multi-level recording mark is the scope at 1＜D/L.

At first, in the wave recording shown in Fig. 1-3, classification ripple strategy is as shown in Figure 4 estimated medium, so which waveform it can specify good.On described normal boot power (Pr+Pbi), set up each wave recording of the present invention.

Use the strategy of Fig. 1-3 to write down the classification ripple, and figure 19 illustrates the result of investigated power dependent.At this, pulse width ratio Wb/Wf is 1/1, and power ratio Wb/Wf is respectively 1/2,2/1,1/1, and the whole burst length width W t of maximum level mark is 50.The whole burst length width of maximum level mark is divided into 100 with elementary cell length, and be they level 7 whole burst length width time value is set.Reproducing power is 0.5mW, and bias power is set to 1.0mW.

Compare these ratios, with the order of Fig. 3, Fig. 2 and Fig. 1, sensitivity is good, finds that the square wave strategy is sensitiveer than twin-stage ripple strategy.But, when the recording power Wb of latter half image pattern 2 tactful such big, the SDR value (low value) that indication is best.Under the situation of the strategy of Fig. 2, the strategy of image pattern 1 like that, it is that big situation is sensitiveer than the recording power of first half, and the SDR value is also low.

Figure 20 shows the effect of introducing bias power.Numeral among the figure shows recording power (mW), has obtained the best SDR value of each bias power from it, and comes executive logging by the classification ripple.

According to Figure 20, though when the whole burst length width of maximum level mark be 50 and 60 any one the time, by introducing bias power, it shows for medium of the present invention, shows the power reduction and the sensitivity improving of best SDR value.Find at this moment SDR value be equate or reduction.

For bias power, expectation is introduced than the big power 0.25mW of reproducing power or is surpassed 0.25mW, preferably 0.5mW or greater than 0.5mW, more preferably from 1.0mW to 2.0mW.In other words, preferably, the ratio Pbi/Pr of reproducing power (Pr) and bias power (Pbi) is 1 or greater than 1, more preferably, described ratio is between 2 and 4.If Pbi/Pr surpasses 4, then on level 0, produce reflectivity change, and SDR value variation greatly.But this value is extreme numerical value in the present embodiment, and particularly, described maximal value is write down and the influences such as sensitivity of the optical maser wavelength, record and the reproduction speed that reproduce, reflectivity, medium.But,, the clearly effect with conditional independence is arranged when Pbi/Pr is at least 0.5 or when bigger.

Figure 21 shows in the recorded at random that the twin-stage ripple that uses the square wave of Fig. 3, Fig. 2 writes down in the ratio (Wt/Lt) of the time width (Lt) of the whole burst length width (Wt) of maximum level mark and elementary cell length and the relation between the SDR value.Bias power has been introduced the value than the big 1.0mW of reproducing power.

As can be as can be seen from Figure 21, at the whole burst length width W t of maximum level mark is that time width Lt with 0.24 micron elementary cell length carries out 30～80 o'clock in 100 five equilibriums, and two kinds of strategies all demonstrate good SDR value in from 0.3 to 0.8 scope.Preferred scope is between 0.35 and 0.7.

And in various factors, in order to improve the characteristic of multi-level recording, the average recess width Wg and the relation between the elementary cell length L of guide groove are very important.

Figure 22 shows in the recorded at random that the twin-stage ripple at the square wave that uses Fig. 3 and Fig. 2 writes down average groove width Wg and the ratio (Wg/L) of elementary cell length (L) and the relation between the SDR value at guide groove.Bias power is greater than reproducing power 1.0mW.Described elementary cell length is fixed on 0.24 micron, and the average groove width Wg of guide groove changes between 0.5 and 1.8 micron.

As finding out in Figure 22, SDR shows good value between 0.7 and 1.5, but outside this scope, described value is variation promptly.

Similarly, in order to improve the characteristic of multi-level recording, the relation between the depth D p of guide groove and the elementary cell length L is very important.

Figure 23 shows in the recorded at random that the twin-stage ripple at the square wave that uses Fig. 3 and Fig. 2 writes down in the ratio (L/Dp) of elementary cell length (L) and channel depths (Dp) and the relation between the SDR value.Bias power is greater than reproducing power 1.0mW.Described elementary cell length is fixed on 0.24 micron, and the degree of depth Lp of guide groove changes between 25 and 120 microns.

As can in Figure 23, finding out, SDR L/

Dp

3 and 8 between show good value, but outside this scope, described value is variation promptly.Preferably, L/Dp is between 4 and 7.

Figure 24 shows in the recorded at random that the twin-stage ripple at Fig. 2 writes down in the ratio (Pf/Pb) of recording power Pf and Pb and the relation between the SDR value.Bias power is greater than reproducing power 1.0mW.Elementary cell length is 0.24 micron, and the whole burst length width W t of maximum level mark is set to 50, and promptly the time width Lt of elementary cell length is divided into half of 100 with being equal to, and the ratio of pulse width Wb/Wf is set to 1/1.

As can in Figure 24, finding out, the SDR value Pf/Pb 0.3 and 1 between show good value.Particularly, the SDR value Pf/Pb 0.4 and 0.9 between show lower value, and along with described value becomes big, recording power reduces.That is, recording sensitivity improves.

Figure 25 shows in the recorded at random that the twin-stage ripple that uses Fig. 2 writes down in the ratio (Wb/Lt) of the burst length of maximum level mark width W b and whole burst length width (Wt) and the relation between the SDR value.Make bias power than the big 1.0mW of reproducing power.Elementary cell length is 0.24 micron, whole burst length width W t be set to time width Lt with elementary cell length be divided into with being equal to 100

half

As can in Figure 25, finding out, the SDR value Wb/Wt 0.3 and 0.8 between show good value.Particularly, the SDR value Wb/Wt 0.4 and 0.8 between show lower value, and along with described value becomes big, recording power lowers.That is, recording sensitivity improves.

And, work as Bi ₂O ₃When comprising one or more element M of selecting from the group that is made of Al, Cr, Mn, Sc, In, Ru, Rh, Co, Fe, Cu, Ni, Zn, Li, Si, Ge, Zr, Ti, Hf, Sn, Pb, Mo, V and Nb, layer obtains identical result.

And layer formation of its on substrate is made into counter-rotating, uses sputter to provide the Ag reflection horizon of 150nm, the ZnS-SiO of 65nm in regular turn on the polycarbonate substrate with guide groove (26nm degree of depth) (0.6 millimeter thickness) ₂The Bi of thin layer and 12nm ₂O ₃Thin layer.Then, the overlayer that will have 0.08mm thickness is pasted with the double-sided adhesive sheet with 0.02mm thickness, makes recordable type optical recording media of the present invention thus.

For described optical recording media, use CD assessment apparatus DDU-1000 (wavelength: 405nm, the numerical aperture: 0.65) come of Pulstec Industry Inc from the cover layer side executive logging.Even the formation of substrate changes in proper order and uses the laser with large-numerical aperture value, also can obtain effect of the present invention similarly.And, in the multi-level recording identical with present embodiment, in the feature medium, wherein the track space of guide groove between 0.25 and 0.5 micron, the degree of depth 15 and 150nm between, average groove width between 0.15 and 0.35 micron and the reflectivity in non-recording status between 2 and 50%, obtain effect of the present invention similarly.

The 3rd embodiment (with the embodiment of application of policies of the present invention) to other media

The phthalocyanine dye medium

Use spin-coating method that the phthalocyanine dye of chemical constitution 2 as follows is covered on the have guide groove polycarbonate substrate (0.6mm is thick) of (26nm is dark).In addition, use solution to carry out spin coating, wherein, dissolve in the mixed solvent of Gou Chenging below and preparation pigment.

Weight of solvent %

Methyl alcohol 23%

Ethanol 55%

2-propyl alcohol (propanol) 22%

The absorbance of all pigment in wavelength 405nm is set to 0.65.

Chemical constitution 2

Therefore; on the recording layer that constitutes by the phthalocyanine dye that as above forms, form 100 microns Ag reflection horizon; use spin coating method that the about 5 microns protective seam that is made of uv-hardening resin (SD1700, Dainihonink chemical industry inc.) is provided then in the above.

The TeO medium

Use sputters at the ZnS-SiO that 65nm is provided on the have guide groove polycarbonate substrate (0.6 millimeter thickness) of (26nm is dark) in regular turn ₂The TeO of thin layer, 20nm ₂The ZnS-SiO of thin layer, 65nm ₂The Ag reflection horizon of thin layer and 150nm.Then,, use spin coating method that the about 5 microns protective seam that is made of uv-hardening resin (SD1700, Dainihon ink chemical industry inc.) is provided in the above, make the recordable type optical recording media thus.

As embodiment 2, executive logging on two kinds of above-mentioned optical recording medias.

Use the strategy of Fig. 1-3 to write down the classification waveform, and the result of investigated power dependent has been shown in Figure 28 and 29.Figure 28 is the figure that is used for the phthalocyanine dye medium, and Figure 29 is the figure that is used for the TeO medium.At this, pulse width ratio Wb/Wf is 1/1, and power ratio Wb/Wf is respectively 1/2,2/1,1/1, and the whole burst length width of maximum level mark is 50.The whole burst length width of maximum level mark is divided into 100 with elementary cell length, and be they level 7 whole burst length width time value is set.Reproducing power is 0.5mW, makes bias power greater than reproducing power 1.0mW.

According to Figure 28 and 29, with the order of Fig. 3, Fig. 2 and Fig. 1, sensitivity is good, finds that the square wave strategy is sensitiveer than twin-stage ripple strategy.But, when the recording power Wb of latter half image pattern 2 tactful such big, the SDR value (low value) that indication is best.Under the situation of the strategy of Fig. 2, the strategy of image pattern 1 like that, it is that big situation is more sensitive than the recording power of first half, and the SDR value is also low.That is, in these media, also use identical trend to obtain the effect of recording method of the present invention.

Figure 30 shows the effect of introducing bias power.Numeral among the figure shows recording power (mW), has obtained the best SDR value of each bias power from it, and comes executive logging by the classification ripple.

According to Figure 30, by introducing bias power, it shows for any one medium of the present invention, shows that the power reduction and the sensitivity of best SDR value is enhanced.The SDR value of finding this moment be equate or reduction.

For bias power, expectation is introduced than the big 0.2mW power of reproducing power or is surpassed 0.2mW, preferably 0.5mW or greater than 0.5mW, more preferably from 0.8mW to 2.0mW.In other words, preferably, the ratio Pbi/Pr of reproducing power (Pr) and bias power (Pbi) is 1 or greater than 1, more preferably, described ratio is between 2 and 4.Surpass 4 big bias power if introduce Pbi/Pr wherein, then on level 0, produce reflectance varies, and SDR value variation greatly.But this value is extreme numerical value in the present embodiment, and particularly, described maximal value is write down and the influences such as sensitivity of the optical maser wavelength, record and the reproduction speed that reproduce, reflectivity, medium.But,, the clearly effect with conditional independence is arranged when Pbi/Pr is at least 0.5 or when bigger.

Figure 31 shows in the recorded at random that the twin-stage ripple that uses Fig. 2 writes down in the ratio (Wt/Lt) of the time width (Lt) of the whole burst length width (Wt) of maximum level mark and elementary cell length and the relation between the SDR value.Bias power has been introduced the value than the big 1.0mW of reproducing power.

As can be as can be seen from Figure 31, at the whole burst length width W t of maximum level mark is that time width Lt with 0.24 micron elementary cell length carries out 30～80 o'clock in 100 five equilibriums, and two kinds of strategies all demonstrate good SDR value in from 0.3 to 0.8 scope.Preferred scope is between 0.35 and 0.7.

And, in various factors, in order to improve the characteristic of multi-level recording, be very important in the average recess width Wg and the relation between the elementary cell length L of guide groove.

Figure 32 shows in the recorded at random that the twin-stage ripple at the square wave that uses Fig. 3 and Fig. 2 writes down average groove width Wg and the ratio (Wg/L) of elementary cell length (L) and the relation between the SDR value at guide groove.Bias power is greater than reproducing power 1.0mW.Described elementary cell length is fixed on 0.24 micron, and the average groove width Wg of guide groove changes between 0.15 and 0.38 micron.

Can find out in Figure 32 that SDR shows good value between 0.7 and 1.5, but outside this scope, described value is variation promptly.

Figure 33 shows in the recorded at random that the twin-stage ripple at the square wave that uses Fig. 3 and Fig. 2 writes down in the ratio (L/Dp) of elementary cell length (L) and channel depths (Dp) and the relation between the SDR value.Bias power is greater than reproducing power 1.0mW.Described elementary cell length is fixed on 0.24 micron, and the depth D p of guide groove changes between 25 and 120 microns.

Can in Figure 33, find out, for two media, SDR L/

Dp

Figure 34 shows in the recorded at random that the twin-stage ripple that uses Fig. 2 writes down in the ratio (Pf/Pb) of recording power Pf and Pb and the relation between the SDR value.Bias power is greater than reproducing power 1.0mW.Under the situation of not crosstalking, elementary cell length is 0.24 micron, the whole burst length width W t of maximum level mark is set to 50, and the time width Lt that is about to elementary cell length is divided into half of 100 with being equal to, and the ratio Wb/Wf of pulse width is set to 1/1.

Can in Figure 34, find out, for two media, the SDR value Pf/Pb 0.3 and 1 between show good value.Particularly, the SDR value Pf/Pb 0.4 and 0.9 between show lower value, and along with described value becomes big, recording power reduces.That is, recording sensitivity improves.

Figure 35 shows in the recorded at random that the twin-stage ripple that uses Fig. 2 writes down in the ratio (Wb/Lt) of the burst length of maximum level mark width W b and whole burst length width (Wt) and the relation between the SDR value.Make bias power than the big 1.0mW of reproducing power.Elementary cell length is 0.24 micron, whole burst length width W t be set to time width Lt with elementary cell length be divided into with being equal to 100 half 50, and the ratio Pf/Pb of recording power is set to 1/2.And, use the classification waveform of Fig. 4 to carry out this test.

Can in Figure 35, find out, for two media, the SDR value Wb/Wt 0.3 and 0.8 between show good value.Particularly, the SDR value Wb/Wt 0.4 and 0.7 between show lower value, and along with described value becomes big, recording power lowers.That is, recording sensitivity improves.

As mentioned above, even when recording method of the present invention is applied to medium except 11 to 18 destination media of the present invention, described effect also is big, and shows the effect with same trend.

And, in the multi-level recording identical with present embodiment, in the feature medium, wherein the track space of guide groove between 0.25 and 0.5 micron, the degree of depth 15 and 150nm between, average groove width between 0.15 and 0.35 micron and the reflectivity in non-recording status between 2 and 50%, obtain effect of the present invention similarly.

According to another aspect of the present invention, an alternative embodiment of the invention is described with reference to figure 38-45.Figure 38 shows the configured in one piece according to the optical disc apparatus 20 of the embodiment of the invention.Optical disc apparatus 20 for example comprises: spindle drive motor 22 is used to drive the rotation of CD 15; Optic pick-up 23; Search motor 21, be used for driving optic pick-up 23 to balladeur train (sledge) direction; Laser control circuit 24; Scrambler 25; Drive and Control Circuit 26; Reproducing signal treatment circuit 28; Buffer RAM 34; Buffer manager for use 37; Interface 38; Flash memory 39; CPU 40; And RAM 41.Note,, do not indicate each to be illustrated all connections of piece flowing of indication type signal of the arrow shown in Figure 38 and information.And optical disc apparatus 20 may be used on multi-level recording type (multi-level recording method), and the data that are used to write down (information) are through multiple-stage treatment, such as handling through 8 grades (0-7).And, will for example be used as CD 15 corresponding to the information recording carrier of about 405nm wavelength according to described embodiment of the present invention.

In the multi-level recording method, in fact track is divided into a plurality of zones (unit), and wherein, each zone (unit) has predetermined length (being called as length S in this example) on the tangential direction of track, as illustration in Fig. 2.In individual unit, stored the single unit (value) of multi-stage data.Value at multi-stage data is under the situation of 1-7, and the core in described unit forms record mark, and wherein, each record mark has the zone corresponding to the value of multi-stage data.Should be noted that when the value of multi-stage data is 0, in described unit, do not form mark.

Because reflectivity reduces when the area of record mark part becomes big, therefore when the value of multi-stage data is 0, from the reproducing signal (RF signal) that from the reflection of the laser of the recording surface of CD 15, produces in the superlative degree (L0), as shown in Figure 39.And when the value of multi-stage data was 7, described reproducing signal was at lowermost level (L7).Should be noted that when the value of multi-stage data is 1-6 respectively the level of reproducing signal is L1-L6.

Simultaneously, in described multi-stage type recording method, calculate the coefficient S DR that is used for the evaluate recorded quality according to formula given below (1).

SDR＝(σm ₀+σm ₁+…+σm _α-1+σm _α)/((1+α)·|R ₀-R _α|) (1)

At this, described information is converted into the level (m of (α+1) individual type ₀, m ₁..., m _α-1, m _α) combination.And, m ₀, m ₁..., m _α+1, m _αThe multi-stage data m that expression is corresponding ₀, m ₁..., m _α-1, m _αReproducing signal level (R ₀, R ₁..., R _α-1, R _α) standard deviation.

Optic pick-up 23 is configured to bombardment with laser beams on the formed spiral of recording surface or centrifugal railway of the CD 15 that rotates by spindle drive motor 22, and receives the light that reflects from the recording surface of CD 15.As shown in Figure 3, optic pick-up 23 comprises for example light source cell 51, collimation lens 52, beam splitter 54, object lens 60, detection lens 58, photodetector PD and driver element (focus actuator, tracking actuator, not shown).

Light source cell 51 comprises the semiconductor laser LD as light source, is used to launch the laser beam with about 405nm wavelength.Should be noted that from the maximum intensity light beam of the laser of light source cell 51 radiation by towards+directions X.Be arranged to towards light source cell 51+collimation lens 52 of directions X will be the light of almost parallel from the laser beam datum of light source cell 51 radiation.

Be arranged to towards collimation lens 52+beam splitter 54 of directions X will deflect into-the Z direction from CD 15 beam reflected (Returning beam).Be arranged to towards beam splitter 54+beam convergence that the object lens 60 of directions X will be by beam splitter 54 transmission is to the recording surface of CD 15.

Be arranged to towards beam splitter-the detection lens 58 of Z direction converge to separated light beam (Returning beam) optical receiving surface of photodetector PD.As in typical optical disc apparatus, photodetector PD comprises a plurality of light receiving elements (light detector elements), is used for output signal, comprising for example swing (wobble) signal message, reproduction data message, focus error message and tracking error information.

The focus actuator (not shown) is the actuator that is used for critically driving object lens 60 on focus direction (direction of the optical axis of object lens 60).Following the tracks of the actuator (not shown) is the actuator that is used for critically driving object lens 60 on tracking direction (direction vertical with the tangential direction of track).

Then, the processing of summary optic pick-up 23.At first, be substantially parallel light from collimated lens 52 collimations of light source cell 51 emitted light beams.Then, described collimated light beam becomes and incides beam splitter 54.Then, on the recording surface of CD 15, be converged to meticulous hot spot by beam splitter 54 emitted light beams via object lens 60.Then, become substantially parallel light from the recording surface beam reflected of CD 15 at object lens 60, and incide beam splitter 54.Deflected into by beam splitter 54 at Returning beam-the Z direction after, Returning beam is received on photodetector PD via detecting lens 58.Photodetector PD produces current signal by carrying out opto-electronic conversion corresponding to the light quantity that is received.The current signal that is produced is output to reproducing signal treatment circuit 28.

According to the signal from photodetector PD output, reproducing signal treatment circuit 28 picked up signal are such as servosignal (for example focus error signal, tracking error signal), address information, synchronizing signal and RF signal.Referring to Figure 38, the servosignal that is obtained is output to Drive and Control Circuit 26, and address information is output to CPU 40, and synchronizing signal is output to scrambler 25.And reproducing signal treatment circuit 28 is for the processing of the execution of RF signal such as decoding processing and/or error detection process.Reproducing signal treatment circuit 28 is stored RF signal (detecting under the situation of error, after proofreading and correct described error) via buffer manager for use 37 in buffer RAM 34.

According to the tracking error from 28 outputs of reproducing signal treatment circuit, Drive and Control Circuit 26 produces and is used to drive the drive signal of following the tracks of actuator, the offset of proofreading and correct the object lens on tracking direction thus.According to the focus error signal from 28 outputs of reproducing signal treatment circuit, Drive and Control Circuit 26 produces the drive signal that is used to drive focus actuator, the offset of proofreading and correct the object lens on focus direction thus.The drive signal that is produced is output to optic pick-up 23.Optic pick-up 23 is carried out tracking Control and focus control according to described drive signal.And Drive and Control Circuit 26 also produces the drive signal that is used to drive the drive signal of searching motor 21 and is used for drive shaft motor 22 according to the instruction of CPU 40.Described drive signal is output to respectively searches motor 21 and spindle drive motor 22.

The data (reproduction data) that buffer RAM 34 temporary transient storages for example will be recorded in the data (record data) in the CD 15 and will reproduce from CD 15.The output of buffer manager for use 37 management buffer RAM 34 and input data.

The record data of scrambler 25 retrieval storages in buffer RAM 34.Carried out for the record data of being retrieved such as data-modulated and increased error correction codes processing after, scrambler 25 produces write signals (be used for write signal) on CD 15.The write signal that is produced is output to laser control circuit 24.

The emissive power of laser control circuit 24 control semiconductor laser LD.For example, in recording operation, laser control circuit 24 produces the drive signal that is used to drive semiconductor laser LD according to the emission characteristics of above-mentioned write signal, record condition and semiconductor laser LD.

In an example shown in Figure 49, laser control circuit 24 can comprise that drive signal generation circuit 24a, modulation circuit 24b, level are provided with circuit 24c and register 24d.

Register 24d is equipped with Write strategy information, comprising about the power information of the recording power of CD 15 and reproducing power and about the information (following) of preheat pulse.

Modulation circuit 24b is according to the Write strategy information of storing in register 24d, produce modulation signal from the write signal of scrambler 25 with from the synchronizing signal of reproducing signal treatment circuit 28.The modulation signal that is produced is output to drive signal generation circuit 24a.

Level is provided with circuit 24c and produces a grade signal according to the power information of storing in register 24d, is used to be provided with the signal level of above-mentioned modulation signal.The level signal that is produced is output to drive signal generation circuit 24a.

Drive signal generation circuit 24a is according to producing the drive signal that is used to drive semiconductor laser LD from the signal (modulation signal) of modulation circuit 24b output with from the signal (level signal) that level is provided with circuit 24c output.The drive signal that is produced is output to semiconductor laser LD.Should be noted that the further details that the following describes the drive signal that is produced.

Interface 38 is to be used for the communication interface that communicates with epigyny device (superordinate apparatus) 90 (for example personal computer).Interface 38 meets the standard interface such as ATAPI (AT additional packet interface), SCSI (small computer systems interface) and USB (USB (universal serial bus)).

Flash memory 39 is configured to have the program space and data space.The program space of flash memory 39 is mounted and for example uses the program of being write by CPU 40 decodable codes.The data space of flash memory 39 has been mounted for example record condition, such as emission characteristics, recording power and/or the Write strategy of semiconductor laser LD.Can and obtain to comprise the record condition of described power information and described Write strategy corresponding to the experience of every type of CD (for example manufacturer's title, lot number) and/or each writing speed according to for example test result, simulation result, Theoretical Calculation.

According to program stored in the program space of flash memory 39, the above-mentioned components/elements of CPU 40 controls, and needed data are controlled in storage in RAM 41 and buffer RAM 34.For example, when loading (installations) CD 15, described power information and Write strategy information that CPU 40 extracts corresponding to CD 15 types, and the information of being extracted to register 24d transmission.

Then, be described in the drive signal that produces in the drive signal generation circuit 24.Described drive signal is a pulse signal, and it comprises: the signal of preheat pulse is used for recording layer is preheating to temperature less than initial markers formation temperature Tm; And the signal of main pulse is used for recording layer is heated to the temperature that is not less than initial markers formation temperature Tm.Described preheat pulse comprises at least one pulse, and it has greater than the power level of the reproducing power of CD 15 (Pr) and is not more than 80% power level of recording power (Pw).Main pulse comprises at least one pulse, and it has the power level of recording power Pw.

Bring in advance with respect to preheat pulse and master pulse and to simulate.According to Simulation result and observation, optimum shape is set to preheat pulse and main pulse, so that can on recording layer, accurately form record mark corresponding to multi-stage data.Information about the optimum shape of preheat pulse and main pulse is included in the above-mentioned Write strategy information.The following describes described simulation.

The CD that uses in the simulation (for convenience following and be called " virtual disk ") comprises substrate, recording layer and the reflection horizon that the order that begins from incident ray side as shown in Figure 50 provides.Referring to the form shown in Figure 51, described substrate has 1.6 refractive index n, 0 attenuation coefficient k, 1.4 specific heat C (J/cm ³/ ℃) and 0.0021 pyroconductivity K (J/cm/ second/℃); Recording layer has the film thickness of 15 (nm), 2.8 refractive index n, 0.56 attenuation coefficient k, 2.6 specific heat C (J/cm ³/ ℃) and 0.12 pyroconductivity K (J/cm/ second/℃); Thermal insulation layer has the film thickness of 80 (nm), 2.3 refractive index n, 0.0006 attenuation coefficient k, 1.7 specific heat C (J/cm ³/ ℃) and 0.01 pyroconductivity K (J/cm/ second/℃); The reflection horizon has the film thickness of 100 (nm), 0.108 refractive index n, 2.05 attenuation coefficient k, 2.44 specific heat C (J/cm ³/ ℃) and 4.21 pyroconductivity K (J/cm/ second/℃).

In described simulation, the wavelength that is radiated the laser beam on the virtual disk is 405nm; The length of individual unit is 240nm; The radius of the luminous point that forms on recording layer (light beam spot) is 265nm; The temperature of initial markers formation temperature Tm on recording layer is 500 ℃.

Referring to Figure 52-53, the input transponder pulse is to be used for respectively to four unit record multi-stage data levels " 0 " " 7 ", " 1 " and " 0 " (with order of unit A, unit B, unit C and cells D).At this, with being associated in the past of time, obtain the variation of the temperature (hereinafter referred to as " recording layer temperature ") at the interface between recording layer and thermal insulation layer with respect to the center (being called as " CC ") of the center (being called as " CB ") of the center (being called as " CA ") of unit A, unit B and unit C.

At first, the light transponder pulse comprise two preheat pulse (Hp1, Hp2) and describe single smooth transponder pulse under the situation of a main pulse (Hm) corresponding to single record mark.As shown in Figure 54, for record mark corresponding to multi-stage data " 7 ", has the first preheat pulse Hp1 of power 1.5mW in 0.0ns radiation in the period between the 61.8ns, the second preheat pulse Hp2 that has power 4.0mW then in 61.8ns radiation in the period between the 72.0ns is a recording power in the main pulse Hm radiation that 72.0ns will have 7.0mW power in the period between the 82.2ns then.And, for record mark corresponding to multi-stage data " 1 ", has the first preheat pulse Hp1 of power 1.5mW in 82.2ns radiation in the period between the 115.4ns, the second preheat pulse Hp2 that has power 4.0mW then in 115.4ns radiation in the period between the 120.0ns has the main pulse Hm of 7.0mW power then in 120.0ns radiation in the period between the 124.6ns.In this example, the power of the first preheat pulse Hp1 (being indicated as " Ph1 " in the accompanying drawings) approximately is that 21%, the second preheat pulse Hp2 (being indicated as " Ph2 " in the accompanying drawings) of recording power Pw approximately is 57% of recording power Pw.Notice that time (ns) from the moment that begins (top) that optical spot centre arrives unit A begins.Exemplary analog result is illustrated among Figure 55.

Then, for purpose relatively, only comprise the single smooth transponder pulse of describing under the situation of a main pulse (Hm) corresponding to single record mark at the light transponder pulse.As shown in Figure 56, for the record mark corresponding to multi-stage data " 7 ", the main pulse Hm radiation that will have 6.5mW power to the period between the 82.2ns at 61.8ns is a recording power.And for the record mark corresponding to multi-stage data " 1 ", the main pulse Hm radiation that will have 6.5mW power to the period between the 124.6ns at 115.4ns is a recording power.Except main pulse, the bombardment with laser beams that will have 0.5mW power is reproducing power Pr.Figure 57 shows the comparison Simulation result.

In comparing the result shown in Figure 55 and 57:

(1) for CB and the CC of Figure 55, compare with the situation shown in Figure 57, it is short that its recording layer temperature surpasses the time of initial markers formation temperature Tm;

(2) for CB and the CC of Figure 55, compare with the situation shown in Figure 57, near the temperature of its recording layer temperature initial markers formation temperature Tm rises faster.

This shows, and the record mark that provides preheat pulse will make fine size can accurately form and prevent shake (referring to Figure 58 A and 58B) effectively.Notice that Figure 58 A is the isothermal chart of the unit B under the situation that preheat pulse is provided, Figure 58 B is the isothermal chart of the unit B under the situation that preheat pulse is not provided.

Then, by reducing recording power Pw and only use master pulse to bring and carry out further simulation so that make the recording layer temperature of CB above time of initial markers formation temperature Tm identical with in the example shown in Figure 55 basically.Figure 59 shows the result who is set to one of the simulation under the situation of 6.0mW at recording power, and Figure 60 shows another the result who is set to the simulation under the situation of 5.5mW at recording power.The time that the recording layer temperature that either way demonstrates CB not only surpasses initial markers formation temperature Tm becomes shorter, and the time that the recording layer temperature of CC surpasses initial markers formation temperature Tm also become shorter, prevent from normal condition, to form multi-stage data thus.And, being similar in the result shown in Figure 57, the fluctuation of shape that has record mark is low with the risk that increases because near the temperature the initial markers formation temperature rises.In other words, this shows and can not only improve recording quality by adjusting recording power Pw.

Then, carry out another simulation, wherein, the shape of preheat pulse is changed.

As shown in Figure 61, for record mark corresponding to multi-stage data level " 7 ", has the first preheat pulse Hp1 of power 5.0mW in 61.8ns radiation in the period between the 71.0ns, have the second preheat pulse Hp2 of power 2.0mW then in 71.0ns radiation in the period between the 72.0ns, the main pulse Hm radiation that will have power 7.0mW to the period between the 82.2ns at 72.0ns is a recording power then.And, for record mark corresponding to multi-stage data level " 1 ", has the first preheat pulse Hp1 of power 5.0mW in 115.4ns radiation in the period between the 119.0ns, the second preheat pulse Hp2 that has power 2.0mW then in 119.0ns radiation in the period between the 120.0ns has the main pulse Hm of power 7.0mW then to the period radiation between the 124.6ns at 120.0ns.In this example, the power of the first preheat pulse Hp1 (being indicated as " Ph1 " in the accompanying drawings) approximately is 71% of recording power Pw, and the second preheat pulse Hp2 (being indicated as " Ph2 " in the accompanying drawings) approximately is 29% of recording power Pw.Except main pulse and preheat pulse, the laser beam with power 0.5mW by radiation as producing reproducing power Pr.That is, Figure 54 is the situation of Ph＜Ph2, and Figure 61 is the situation of Ph1＞Ph2.This Simulation result is illustrated among Figure 62.

As shown in Figure 62, the recording layer temperature is preheated pulse Hp1 and improves, and is preheated pulse Hp2 then and reduces, and then improved by main pulse Hm.As in the exomonental result of the light shown in Figure 54, this Simulation result also demonstrates: the recording layer temperature of (1) CB and CC surpasses initial markers formation temperature Tm in the short time, the recording layer temperature of (2) CB and CC promptly rises near initial markers formation temperature Tm.Particularly, in this simulation, and compare in the result shown in Figure 54, (1) can suppress the rising of temperature in the unit that does not form record mark, and (2) cooling velocity after forming record mark is faster.For example, even be under the wide situation or under the situation in the thermal stability deficiency of record mark, also can prevent to shake and/or the loss of SDR at initial markers formation temperature Tm.

(operation of first exemplary record)

Then, optical disc apparatus 20 under the situation of epigyny device 90 receiving record request commands referring to Figure 41 explanation first example according to recording operation of the present invention.In the sequence of the process flow diagram shown in Figure 41 corresponding to the Processing Algorithm of carrying out by CPU 40.

When optical disc apparatus 20 when epigyny device 90 receives the record request order, be set to the programmable counter of CPU 40 corresponding to top address in the program (recording operation program) of the process flow diagram shown in Fig. 4; Thus, opening entry operation.Should be noted that when CD 15 is set to optical disc apparatus 20, determine the type of CD 15, and transmit described type to the circuit such as laser control circuit 24 and/or reproducing signal treatment circuit 28.And the type of CD 15 is stored among the RAM 41 in advance.

In step S401, by receiving the rotation that the record request order starts spindle drive motor 22 to spindle drive motor 22 output drive signals with to 28 reports of reproducing signal treatment circuit from epigyny device 90 according to writing speed.In addition, CPU 40 instruction buffer managers 37 are stored the user data (record data) that receives from epigyny device 90 in buffer RAM 34.

Then, in step S403,,, then servo being set to of Drive and Control Circuit 26 connected CPU 40 with predetermined linear velocity (or angular velocity) rotation in case confirming CD 15.Thus, carry out above-mentioned tracking Control and focus control.Should be noted that and always to carry out described tracking Control and focus control, till recording operation finishes.

Then, at step S405, the record condition that CPU 40 is provided with such as recording power and Write strategy.Corresponding to the type and the writing speed of CD 15, from the data space of flash memory 39, extract record condition.Should be noted that and under the situation that does not find corresponding record condition, use the default record condition of in data space, storing.And, under record condition is recorded in situation in the CD 15, can use such record condition that is recorded.

Then, at step S407, in the zone that CD 15 provides, according to the record condition that is provided with in step S405, record has a plurality of test patterns of identical multi-stage data.In other words, carry out test record (test writes) operation.

At this, the size of test zone is described.In this embodiment of the present invention, the quantity β of the unit that comprises in single test zone is set to satisfy formula given below (1).

β＝A+2 (1)

In this formula (1), when the result of calculation with 2R/S rounded up, A was an integer, and wherein, 2R is the some parameter (on the tangential direction at track) at the luminous point that reproduction period forms in orbit.For example, under the situation of S=0.24 (micron) and 2R=0.54 (micron), satisfy β=5.Therefore, in this example, the quantity of the unit in single test zone is 5.

Record is corresponding to the maximum mark (referring to Figure 42) of multi-stage data level " 7 " in each unit of test zone.That is, use 5 multi-stage data levels " 7 " to form test pattern.In described embodiment of the present invention, repeatedly write down three same test patterns (referring to Figure 43).Although should be noted that before and after test pattern provides the not record space that has than beam diameter length, as shown in figure 43, before and after test pattern, can maybe cannot provide not record space.And, can provide test zone in the outside (inboard of data space or the outside) or the inside of data space of data space.

Then, in step S409, write down (referring to Figure 43) for each test zone.

Then, at step S411, CPU 40 is corresponding to (T1-T5) reproducing signal of sample test area of the sequential (timing) of the center of each unit, and detects the signal level (referring to Figure 44 A-44C) of each unit.

Then, in step S413, detect the not signal level of record space.

Then, at step S415, calculate the reference value Q of the reproducing signal that is used to assess test zone according to formula given below (2).

Q＝|DR|/{γ·(α-1)} (2)

At this, " DR " is illustrated in the reproducing signal level of record space not and wherein write down poor between the reproducing signal level in space of maximum mark; The value (being 8 in this example) of " α " expression multi-stage data; And " γ " expression is not less than 1 value (preferably 2≤γ≤100).

In this embodiment of the present invention, if the multi-stage data that writes down in test zone is level 7 (corresponding to maximum marks) and not record space is provided between test zone, then never obtains DR in the reproducing signal of the reproducing signal of record space and test zone.

And, though can improve recording quality by the value that improves γ, if the value of γ is too greatly then may excessively carry out assessment.Therefore, determine the value of γ corresponding to the characteristic of the type of CD 15 and optical disc apparatus 20.That is, γ is the value (coefficient) that allowed difference (dispersion) limit of level is reproduced in definition.For example, the quantity β of the unit in single test zone is (for example 100 or bigger) under sizable situation, is highly reliable about the detection data of the measures of dispersion of reproducing signal level.Therefore, γ can satisfy relational expression γ  1.On the other hand, the element number β in single test zone is (for example less than 100) under the quite little situation, has not enough reliability about the detection data of the measures of dispersion of reproducing signal level.Therefore, preferably, γ satisfies relational expression γ 〉=2.In described embodiment of the present invention, the value of γ obtains by testing in advance etc., and is stored in the flash memory 39.Should be noted that value at γ is recorded under the situation in the CD 15, can optionally use this record value.

Then, in step S417, from the maximal value and the minimum value of each test zone picked up signal level.But,, in the picked up signal level, do not use data corresponding to unit with the result of calculation value of acquisition by round down R ÷ S for top (the most preceding) test zone and bottom (at last) test zone.In this case, when the value that obtains when the result of calculation by round down R ÷ S is 1, from the data of three unit of centre promptly corresponding to the sampled data of moment T2, T3 and T4 the maximal value and the minimum value of picked up signal level.In this embodiment of the present invention,, therefore obtain described three maximal values and three minimum value because write down three test patterns.Therefore, peakedly on average be set to new maximal value with described three, described three minimum value on average are set to new minimum value.Then, poor (δ) of calculating between newly-installed maximal value and newly-installed minimum value.Should be noted that and in described maximal value and described minimum value, do not comprise the exceptional value that causes owing to defective etc.

In step S419, CPU 40 determines whether that difference δ is less than or equal to reference value Q.

In the reproducing signal level is to tilt considerably (for example as among Figure 44 B and the 44C) under the situation of (signal level variation), and difference δ is greater than reference value Q (among the step S419 not); Operation proceeds to step S421 thus.That is, interference volume is different according to record position between the big inclination designated symbol of reproducing signal level.

In step S421, CPU 40 adjusts/changes at least one of recording power and Write strategy corresponding to difference δ with respect to reference value Q.Operation turns back to step S407.

Repeating step S407-S412 is up to determining that reference value Q is not less than poor δ (being among the step S419).

In the reproducing signal level is under the smooth basically situation (for example as among Figure 44 A), and difference δ is not more than reference value Q (being in the step 419); Operation proceeds to step S423 thus.That is, interference volume is uniformly between smooth basically reproducing signal level designated symbol, and irrelevant with record position.

At step S423, CPU 40 determines optimal recording power and Write strategy.The information of determined recording power and Write strategy is reported to laser control circuit 24.Therefore, laser control circuit 24 produces appropriate driving signal.

In step S425, the information of the reference value of being calculated is write down in CPU 40 guiding by CD 1.

Then, in step S427, CPU 40 instruction Drive and Control Circuit 26 formed luminous point before the target location.Therefore, the searching of carrying out optic pick-up 23 is moved.Should be noted that not needing to seek under the mobile situation and can skip this processing.

Then, in step S429, CPU 40 allows user data.Therefore, come user data in CD 15 via the above-mentioned parts such as scrambler 25, laser control circuit 24 and optic pick-up 23 according to suitable record condition.

Then, in step S431, CPU 40 has determined whether to finish the record of user data.If do not finish the record of user data, finishing of then will writing down is defined as not (among the step S431 not).After passing by at the fixed time, CPU 40 determines whether to have finished the record of user data once more.If finished the record of user data, finishing of then will writing down is defined as certainly (being among the step S431), and operation proceeds to step S433 thus.

In step S433, CPU 40 instruction Drive and Control Circuit 26 are closed servo being set to.Subsequently, recording operation finishes.

Therefore, in optical disc apparatus 20, can obtain test and write part (test record part) and acquisition partly (record condition acquisition part) and function thereof by using CPU40 and carrying out above-mentioned routine processes with CPU 40 according to the above embodiment of the present invention.In other words, can write part, and can obtain part to realize described record condition at the step S409-S423 shown in Figure 41 to realize test at the step S407 shown in Figure 41.Should be noted that can be partly or wholly passes with the form of hardware comes the processing of executive routine and the part that obtains with CPU 40.

And, obtain treating apparatus and function thereof by scrambler 25, laser control circuit 24, optic pick-up 23, CPU 40 and the program carried out by CPU 40.

And, according to embodiments of the invention, can use the above-mentioned recording operation program that in flash memory 39, comprises in the program stored to carry out program of the present invention.Promptly, use is carried out test ablation process (test record process) corresponding to the program of the processing in the step S407 shown in Figure 41, can use corresponding to program and carry out procurement process (record condition procurement process), and can use corresponding to program and come the executive logging process in the processing of the step S429 shown in Figure 41 in the processing of the step S409-S423 shown in Figure 41.

And, can realize that record condition of the present invention determines method and recording method by carrying out above-mentioned recording operation.Promptly, can use processing at the step S407 shown in Figure 41 to realize that record condition determines the first step of method, use the processing of step S407-S423 to realize that described record condition determines second step of method, and use the recording step of realizing described recording method at the step S429 shown in Figure 41.

In optical disc apparatus 20, before the processing of user data, carry out test and write processing according to described embodiment of the present invention.Write in the processing in test, so that the length of test zone tests continuously the multi-stage data level that writes (test record) identical (being equal to) greater than the mode of the spot diameter of the luminous point that forms in orbit at reproduction period in predetermined test zone.Therefore, when becoming, the maximal value of the reproducing signal in test zone and the difference between the minimum value obtain described recording power and Write strategy when being not more than reference value Q.If test zone has than the bigger length of spot diameter and write a plurality of identical multi-stage data levels in test zone, then can the clearly influence of indication (identification) intersymbol interference in the reproducing signal of test zone.Therefore, recording power that is obtained and Write strategy are the record conditions that is used under the situation of the influence that has little intersymbol interference.This feasible record condition that can determine to be suitable for the situation of the multistage information of record (three grades or more multistage) in CD.

And, be that record condition under the little situation comes recorded information in CD owing to use influence corresponding to intersymbol interference, therefore can in CD, write down 3 grades or more multistage multistage information with high recording quality.

And, because use the reproducing signal in test zone to calculate reference value Q, therefore can come the influence disturbed between evaluation symbol with enough degree of accuracy.

And, because the reference value Q that is calculated is recorded in the CD 15, therefore when reinstalling CD 15, can reuse reference value Q.

Should be noted that according to the above embodiment of the present invention though single test zone comprises 5 unit, the quantity of the unit in single test zone is not limited to 5.Single test zone can comprise the unit except 5, as long as the quantity of described unit is not less than the value of β.For example, Figure 45 A and 45B show the situation that comprises 10 unit (unit A-J) in single test zone.It is reproducing signal under the suitable situation that Figure 45 A shows recording power and Write strategy both.It is reproducing signal under the unaccommodated situation that Figure 45 B shows recording power and Write strategy both.

Simultaneously, comprise at single test zone under the situation of three unit unit of the value of β (promptly less than), do not reduced fully, as shown in Figure 47 A and the 47B at the signal level of sampling instant T1 and T3.Therefore, though form the record mark of identical (being equal to) in each unit (unit A-C), the reproducing signal level is inequality.Whether therefore, can not assessing fully, recording power and Write strategy are suitable.

And, though the formation of the identical test zone of triplicate can disposablely optionally form test pattern.And, can revise the formation of test pattern corresponding to expected accuracy and/or admissible processing time.

In the CD 15 of the above embodiment of the present invention, when the area of record mark increased, the signal level of reproducing signal diminished.Perhaps, when the area of record mark increased, it is big that the signal level of the reproducing signal of CD 15 may become.

The above embodiment of the present invention has been described information (data) by multistage situation to 8 grades (0-7).But described information (data) can be by multistage to other levels, as long as described level is 3 grades or more.

And, though the above embodiment of the present invention has been described the situation of S=0.24 and 2R=0.54 micron, other values can be applied to " S " and/or " 2R ".

And the foregoing description has been described in the unit and have been formed situation about having corresponding to the record mark in the zone of multi-stage data.Perhaps, can in the unit, form the record mark that has corresponding to the degree of depth of multi-stage data.And, in the unit, can optionally form and have corresponding to the area of multi-stage data and the record mark of the degree of depth.

And the foregoing description has been described the situation of being determined recording power and Write strategy by the reference value Q that uses formula (2) to obtain by relating to.Perhaps, can determine recording power and Write strategy by relating to by using the value that obtains with experience to divide the reference value that the reproducing signal level of record space not obtains.

(operation of second exemplary record)

Though according to the above embodiment of the present invention based on the appropriateness of determining recording power and Write strategy in the maximal value and the difference between the minimum value of reproducing signal level, described determine can be optionally based on the mean value of reproducing signal level.Be described in operation and the processing of CPU40 in this case referring to the process flow diagram shown in Figure 48.

In the step of the front of the step S501-S511 shown in Figure 48 with identical at the step S401-S411 shown in Figure 41.

In step S513, calculate the mean value m of the reproducing signal that in step S511, detects.But,, in calculating mean value m, do not use corresponding to the data that have less than the unit of the max-int of R/S with respect to the test zone of top (the most preceding) and the test zone of bottom (at last).In this case, from obtaining mean value m promptly corresponding to the sampled data of moment T2, T3 and T4 in the data of three unit of centre.

Then, in step S515, determine whether that mean value m is not less than predetermined lower bound and whether mean value m is not more than the predetermined upper limit (lower limit≤m≤upper limit).If mean value m equals any one of the lower limit and the upper limit or betwixt, then be defined as certainly (being among the step S515), operation proceeds to step S517 thus.

Then, come execution in step S517-S521, wherein, calculate reference value Q and at the maximal value of reproducing signal and the poor δ between the minimum value in the mode identical with above-mentioned steps S413-S417.

Then, in step S523, determine whether that described poor δ is not more than (promptly being equal to or less than) reference value Q.If described poor δ is greater than reference value Q then to be defined as negate that operation proceeding to step S525 thus.

At step S525, carry out with step S421 in identical processing.Subsequently, operation turns back to step S507.

Should be noted that if mean value m less than lower limit or greater than the upper limit, then to be defined as in step S515 negate (among the step S515 not).Subsequently, operation proceeds to step S525.

And, in step S523,, difference δ is defined as certainly (being among the step S523) if being not more than reference value Q.Subsequently, operation proceeds to step S527.

With with come execution in step S527-S533 in the identical mode of above-mentioned steps S423-S429.

Then, in step S535, CPU 40 has determined whether to finish the record of user data.If the record of user data is not finished, it negates (among the step S535 not) that finishing of then will writing down is defined as.After passing by at the fixed time, CPU 40 determines whether to have finished the record of user data once more.If finished the record of user data, finishing of then will writing down is defined as certainly (being among the step S535).Subsequently, operation proceeds to step S537.

At step S537, CPU 40 instruction Drive and Control Circuit 26 are closed servo being set to.Subsequently, end record operation.

Same with the foregoing description of recording operation of the present invention, the improvement example of this recording operation also provides the suitable record condition in user data.Should be noted that and to carry out before by relating to determine (the step S523) that poor δ carries out by determine (the step S515) that relates to that mean value m carries out.

In the improvement example of the foregoing description of recording operation of the present invention and recording operation, as for relating to, can carry out determining of suitable recording power and Write strategy by relating in poor, the difference between the mean value of the minimum value of reproducing signal level and reproducing signal level between the mean value of the maximal value of reproducing signal level and reproducing signal level or the standard deviation of reproducing signal level the substituting of the maximal value of reproducing signal level and the poor δ between the minimum value.But, in this case, use and the different reference value of said reference value Q.

Perhaps, can carry out determining of suitable recording power and Write strategy according to following at least one: the reproducing signal level (mean value of first test zone, be called as reproducing signal level S1), the reproducing signal level (mean value of second test zone, be called as reproducing signal level S2) or poor (absolute value) between reproducing signal level S1 and reproducing signal level S2, wherein, test writes multi-stage data level (multi-stage data value) 1 in first test zone, and test writes multi-stage data level 7 in second test zone.Should be noted that described reference value can be value of storing and/or the value that is recorded to CD 15 in the data space of flash memory 39.

Repeatedly carrying out with the whole bag of tricks under the situation about determining of suitable recording power and Write strategy, can change and carry out described definite order.

In the improvement example of the foregoing description of recording operation of the present invention and recording operation, the reproducing signal level of posting field and the reproducing signal level of test zone are not calculated reference value Q at every turn by relating to.But, come optionally to calculate in advance reference value Q by the reproducing signal level of using posting field not and the reproducing signal level that has wherein write down the zone of multi-stage data level 7.And, in CD 15, write down under the situation of reference value Q, can use the reference value that is recorded.And, be used for indicating the type of CD 15 and the form of corresponding reference value Q can be pre-formed and be stored in flash memory 39.In this case, extract (selection) reference value Q from described form corresponding to the type of CD 15.

In the improvement example of the foregoing description of recording operation of the present invention and recording operation,, also can optionally use other multi-stage data level 1-7 though multi-stage data level 7 is used as the multi-stage data level that comprises in the test pattern.But, be under any one situation of multi-stage data 1-6 in the multi-stage data level, use the reference value Q that obtains in advance.

And, by in user data, inserting test pattern in advance, can user data in the adjustment that can carry out recording power and Write strategy.That is, this allows so-called OPC operation.In the above embodiment of the present invention, be under 0 the situation, not form record mark in the multi-stage data level.But, be under 0 the situation in the multi-stage data level, can optionally form less than record mark corresponding to the record mark of multi-stage data level 1.

In the above embodiment of the present invention, record program of the present invention in flash memory 39.But program of the present invention can optionally be recorded in other the recording medium (for example CD, magneto-optic disk, storage card, USB storage, floppy disk).In this case, program of the present invention is via being installed in the flash memory 39 corresponding to the transcriber (or special purpose interface) of recording medium.Program of the present invention also can be sent to flash memory 39 via network (for example LAN (Local Area Network), Intranet, the Internet).In other words, can provide program of the present invention by any way, as long as it is stored in the flash memory 39.

In the above embodiment of the present invention, CD 15 is the information recording carriers that may be used on having the laser beam of about 405nm wavelength.But, can optionally use other information recording carrier, repeatedly read the information recording carrier or the rewritable information recording carrier of type such as commercially available write-once.

(operation of the 3rd exemplary record)

Then, will referring to Figure 63 the 3rd example according to the recording operation of the embodiment of the invention be described under the situation of epigyny device 90 receiving record request commands at optical disc apparatus 20.Process flow diagram shown in Figure 63 is corresponding to the sequence of the Processing Algorithm of being carried out by CPU 40.

When optical disc apparatus 20 when epigyny device 90 receives the record request order, will be set to the programmable counter of CPU 40 corresponding to top address in the program (recording operation program) of the process flow diagram shown in Figure 63; Opening entry operation thus.Should be noted that when CD 15 is set to optical disc apparatus 20, determine the type of CD 15, and described type is sent to circuit such as laser control circuit 24 and/or reproducing signal treatment circuit 28.And, the type of stored CD 15 in RAM 41 in advance.And, in this example, be sent to register 24d corresponding to the power information and the Write strategy information of CD 15.

In step S1401, by according to writing speed to spindle drive motor 22 output drive signals with start the rotation of spindle drive motor 22 from the reception of the record request order of epigyny device 90 to reproducing signal treatment circuit 28 report.In addition, CPU 40 instruction buffer managers 37 are stored the user data (record data) that receives from epigyny device 90 in buffer RAM 34.

Then, in step S1403,,, then servo being set to of Drive and Control Circuit 26 connected CPU 40 with predetermined linear velocity (or angular velocity) rotation in case confirming CD 15.Thus, carry out above-mentioned tracking Control and focus control.Should be noted that and always to carry out described tracking Control and focus control finishes up to recording operation.

At step S1405, CPU 40 positions of instruction Drive and Control Circuit 26 before the target area form luminous point.Therefore, carry out the search operation of optic pick-up 23.Under the situation of search operation, can skip this processing.

At step S1407, CPU 40 allows user data.In the above described manner, via for example scrambler 25, laser control circuit 24 and optic pick-up 23 to the record mark of recording layer record corresponding to user data.That is, comprise the light transponder pulse of preheat pulse and main pulse, to be used for to the single record mark of CD 15 records from optic pick-up 23 radiation.

Then, at step S1409, CPU 40 has determined whether to finish the record of user data.If do not finish the record of user data, finishing of then will writing down is defined as not (among the step S1409 not).After passing by at the fixed time, CPU 40 determines whether to have finished the record of user data once more.If finished the record of user data, finishing of then will writing down is defined as certainly (being among the step S1409), and operation proceeds to step S1411 thus.

In step S1411, CPU 40 instruction Drive and Control Circuit 26 are closed servo being set to.Subsequently, recording operation finishes.

Comprise laser control circuit 24, CPU 40 and the optical disc apparatus 20 according to the embodiment of the invention of the program carried out by CPU 40 comes the 3rd example of executive logging operation by use.And, carry out recording operation of the present invention by the 3rd example of executive logging operation.

As mentioned above, in optical disc apparatus 20, by the next mark (record mark) that on the recording layer of CD (CD-R) 15, forms of the pulsed light emission of laser (laser beam) with respect to the 3rd example of recording operation.When reaching predetermined temperature (being the initial markers formation temperature), temperature starts the formation of mark.In recording method, at first,, recording layer is preheating to temperature less than the initial markers formation temperature by at least one individual pulse of radiation on CD 15 as preheat pulse according to the embodiment of the invention.Described preheat pulse has greater than the reproducing power of CD 15 with less than the power (power level) of the recording power of CD 15 (for example 80% of the recording power of CD 15 or still less).Then, by at least one individual pulse of radiation on CD 15, recording layer is heated to the temperature that is equal to or greater than the initial markers formation temperature as main pulse.Described main pulse has the power (power level) identical with the recording power (power level) of CD 15.If use preheat pulse to heat (preheating) recording layer in advance, then the temperature of recording layer promptly rises to the temperature that is equal to or greater than the initial markers formation temperature.When making and write down in the zone that the temperature to recording layer is equal to or greater than the initial markers formation temperature, this can accurately control, even and make and in record mark is also forming the shape of record mark under less than the situation of the beam diameter of laser (laser beam), can accurately control.Therefore, can on the recording layer of CD 15 (CD-R), form record mark with satisfied precision.Therefore, can come to CD (CD-R) 15 record data (information) with high recording quality.

Referential expression is in the recording layer temperature and start Figure 64 A-64B of the relation between the time in the past of beginning from impulse radiation, wherein single (singular) of recording layer temperature flip-flop point is positioned at the zone of the temperature of recording layer wherein less than the initial markers formation temperature, this be because, using after preheat pulse is heated to temperature less than the initial markers formation temperature, use master pulse to bring recording layer is heated to the temperature that is equal to or greater than the initial markers formation temperature.Should be noted that Figure 64 C shows in the relation between recording layer temperature and the time in the past that begins from the starting impulse radiation under the situation of non-radiating preheat pulse.And, by using main pulse to use before recording layer is heated to the temperature that is equal to or greater than the initial markers formation temperature preheat pulse that recording layer is preheating to temperature less than the initial markers formation temperature, can prevent that recording layer temperature therein from providing described a single point greater than the zone of initial markers formation temperature.Should be noted that Figure 64 D shows recording layer temperature therein provides described a single point greater than the zone of initial markers formation temperature situation.

Though should be noted that in the above embodiment of the present invention preheat pulse is described as comprising two pulses (first pulse and second pulse), preheat pulse of the present invention can optionally be to comprise for example preheat pulse of individual pulse.

And, though use preheat pulse Hp1 to be set greater than power level Ph1 at the preheat pulse Hp2 shown in the example of Figure 61, can optionally use power level Ph2 greater than the power level Ph1 of the preheat pulse Hp1 as shown in Figure 67 be provided with as described in preheat pulse Hp2.

And, can the power level of pre-thermal power be reduced to reproducing power level Pr in reduction period of preheat pulse, as shown in Figure 68.

And, can the power level of main power be reduced to 0 power level in reduction period of main pulse, as shown in Figure 69.

Though in the above embodiment of the present invention main pulse is described as comprising individual pulse, main pulse of the present invention can optionally for example be the main pulse that comprises more than individual pulse.That is, described main pulse can optionally comprise a plurality of pulses.

Though the above embodiment of the present invention has been described information (data) by the multistage situation that turns to 8 levels (0-7), described information (data) can be optionally by multistage other levels that turn to except 8 grades.

The above embodiment of the present invention has been described value (level) when multi-stage data does not form record mark when being 0 situation.But,, can optionally record mark be formed record mark corresponding to multi-stage data 1 when the value (level) of multi-stage data when being 0.

Though the above embodiment of the present invention has been described the zone situation different corresponding to multi-stage data of record mark, the degree of depth of record mark for example can be optionally different corresponding to multi-stage data.In this case, when multi-stage data was 0, described record mark can optionally be formed the record mark that has than corresponding to the degree of depth of the depth as shallow of the record mark of multi-stage data 1.And the area of record mark can be different corresponding to multi-stage data with the degree of depth.In this case, when multi-stage data is 0, form the area and the degree of depth of record mark, it has than corresponding to 1 the record mark little area and the degree of depth.

And, though the above embodiment of the present invention has been described the situation of using multi-stage data, also can use the data of binarization.Under the data conditions of this use binarization, the radiation preheat pulse corresponding to the record mark with shortest length (the shortest mark) only is as shown in Figure 70-72.

In the above embodiment of the present invention, optic pick-up is provided with single semiconductor laser.But described optic pick-up can optionally be provided with a plurality of semiconductor lasers, and its emission has light beams of different wavelengths.For example, the optic pick-up with a plurality of semiconductor lasers can comprise: at least one semiconductor laser, and its emission has the light beam of about 405nm wavelength; Semiconductor laser, its emission has the light beam of the wavelength of about 660nm; Semiconductor laser, its emission has the light beam of the wavelength of about 700nm.That is, optical disc apparatus of the present invention can be the optical disc apparatus that may be used on the CD of various standards.One of described CD in this case, can use various CDs by any way, as long as may be used on the multi-level recording type.

And, the invention is not restricted to these embodiment, but, can change without departing from the scope of the invention and revise.

The application based on respectively on April 19th, 2004, Mays 27 in 2004 order and on May 27th, 2004 Japanese priority application 2004-123492, the 2004-157066 of the application of Jap.P. office and 2004-157068 number, its whole contents is incorporated in this by reference.

Claims

1. record and reproducting method are used at/recording/reproducing data from the optical recording media that comprises guide groove and recording layer, and described recording/reproducing method comprises step:

Come laser beam radiation on optical recording media by at least one of laser emission time and laser emission intensity being modulated to two or more values;

Wherein, the ratio Pbi/Pr of reproducing power (Pr) and bias power (Pbi) is set to is not less than 0.5 value;

Wherein, come record data by always providing the laser beam with power level, this power level comprises the reproducing power (Pr) that is added to bias power (Pbi).

2. recording/reproducing method is used at/recoding/reproduction multi-stage data from the optical recording media that comprises guide groove and recording layer, and described recording/reproducing method comprises step:

Laser beam radiation on optical recording media is used for the recoding/reproduction multi-stage data;

Wherein, write down this multi-stage data under the following conditions: at the 1/e of laser beam center intensity ²The ratio D/L of length (L) of record unit of lasing beam diameter (D) and multi-level recording mark satisfy relational expression 1＜D/L, the record unit of multi-level recording mark is an elementary cell;

Wherein, the ratio Pbi/Pr of reproducing power (Pr) and bias power (Pbi) is set to and is not less than 0.5 value;

3. according to the recording/reproducing method of claim 2, wherein, by using following strategy to come executive logging: the ratio Wt/Lt between the time width (Lt) of the whole burst length width (Wt) of maximum level mark and elementary cell length satisfies relational expression 0.3≤Wt/Lt≤0.8.

4. according to the recording/reproducing method of claim 3, wherein, executive logging on the optical recording media under the following conditions, wherein to have track space, the degree of depth (Dp) scope of 0.25-0.5 micrometer range be that the scope of 15-150nm, average well width (Wg) is the 0.15-0.35 micron to guide groove, the reflectivity of the non-posting field of described optical recording media is 2-50%, wherein, described laser beam is the blue laser with the wavelength that is not more than 450nm.

5. according to the recording/reproducing method of claim 4, wherein, the ratio Wg/L of the length (L) of the average groove width (Wg) of guide groove and record unit satisfies relational expression 0.7≤Wg/L≤1.5.

6. according to the recording/reproducing method of claim 5, wherein, the ratio L/Dp of the length (L) of record unit and the degree of depth (Dp) of guide groove satisfies relational expression 3≤L/Dp≤8.

7. according to the recording/reproducing method of claim 6, wherein, use the strategy of the different recording power that comprises at least two levels to come executive logging.

8. according to the recording/reproducing method of claim 7, wherein, described recording power comprises two levels, and use following strategy to come executive logging: the ratio Pf/Pb of the recording power (Pb) of recording power of first half (Pf) and latter half satisfies relational expression 0.3≤Pf/Pb≤1.

9. according to the recording/reproducing method of claim 8, wherein, described recording power comprises two levels, and uses following strategy to come executive logging: the ratio Wb/Wt of the whole burst length width (Wt) of the recording power of the latter half of burst length width (Wb) and maximum level mark satisfies relational expression 0.3≤Wb/Wt≤0.8.

10. according to the recording/reproducing method of claim 9, wherein, executive logging, thus, the transfer point of the recording power (Pb) of recording power of first half (Pf) and latter half is corresponding to the center of elementary cell.

11. recording/reproducing method according to claim 1, wherein, executive logging on optical recording media, described optical recording media has the RO layer that is positioned at each element that comprises R and Q on the substrate and the thin layer of organic material, wherein, R comprises at least one element of selecting from the group that comprises Y, B, I, In and lanthanide series, wherein O represents oxygen.

12. recording/reproducing method according to claim 11, wherein, executive logging on optical recording media, wherein, the RO film comprises from least one element M of following group selection: described group comprises: Al, Cr, Mn, Sc, In, Ru, Rh, Co, Fe, Cu, Ni, Zn, Li, Si, Ge, Zr, Ti, Hf, Sn, Pb, Mo, V and Nb.

13. according to the recording/reproducing method of claim 11, wherein, executive logging on optical recording media, the formation of described optical recording media be in regular turn the film of RO at least, organic material film and the reflection horizon on its substrate the layer.

14. according to the recording/reproducing method of claim 11, wherein, executive logging on optical recording media, the formation of described optical recording media is film, RO layer and the tectal layer of the reflection horizon at least on its substrate, organic material in regular turn.

15. recording/reproducing method according to claim 1, wherein, executive logging on optical recording media, described optical recording media has RO layer and the dielectric layer on substrate at least, described RO layer comprises each element of R and O, and described dielectric layer has the ZnS as principal ingredient, wherein, R comprises at least one element of selecting from the group that comprises Y, B, I, In and lanthanide series, wherein O represents oxygen.

16. recording/reproducing method according to claim 15, wherein, executive logging on optical recording media, wherein, the RO film comprises from least one element M of following group selection: described group formation comprises Al, Cr, Mn, Sc, In, Ru, Rh, Co, Fe, Cu, Ni, Zn, Li, Si, Ge, Zr, Ti, Hf, Sn, Pb, Mo, V and Nb.

17. recording/reproducing method according to claim 15, wherein, executive logging on optical recording media, the formation of described optical recording media be in regular turn the film of RO at least, dielectric layer and the reflection horizon on its substrate the layer, described dielectric layer has the ZnS as principal ingredient.

18. recording/reproducing method according to claim 15, wherein, executive logging on optical recording media, the formation of described optical recording media are the reflection horizon at least on its substrate, dielectric layer, RO layer and tectal layer in regular turn, and described dielectric layer has the ZnS as principal ingredient.

19. a record condition is determined method, is used to be identified for the record condition of record multi-stage data on the track of the recording surface of CD, described record condition determines that method comprises step:

A) in a plurality of test zones, write a plurality of multi-stage data levels with identical value, each test zone have with the direction of the tangent line of track on designated length, described designated length is greater than the spot diameter of the luminous point that forms in orbit; With

B) level according to the reproducing signal that produces from test zone obtains suitable recording power and Write strategy.

20. the record condition according to claim 19 is determined method, wherein, and when maximal value and the difference between the minimum value in the level of reproducing signal obtain suitable recording power and Write strategy when being not more than reference value.

21. the record condition according to claim 20 is determined method, wherein, described reference value is recorded in the CD.

22. the record condition according to claim 20 is determined method, wherein, described method also comprises step:

C) determine the type of CD;

Wherein, select reference value according to the type of CD from predetermined value.

23. the record condition according to claim 20 is determined method, wherein, described reference value comprises the value that obtains by computing formula { | DR|/{ γ (α-1) } }, wherein, α is the value that is not less than 3 multi-stage data, DR is in the reproducing signal level of posting field not and has wherein write down poor between the reproducing signal level in zone of maximum mark that γ is not less than 1 value.

24. the record condition according to claim 23 is determined method, wherein, described multi-stage data comprises the multi-stage data corresponding to maximum mark, wherein, obtains described reference value by relating to the reproducing signal that produces from test zone.

25. the record condition according to claim 19 is determined method, wherein, and when the mean value of the level of reproducing signal obtains suitable recording power and Write strategy when falling into preset range.

26. the record condition according to claim 19 is determined method, wherein, when suitable recording power and the Write strategy of time acquisition that be not more than predetermined reference value at least one of the minimum value of the level of the maximal value of the level of reproducing signal and reproducing signal and difference between the mean value of the level of reproducing signal.

27. the record condition according to claim 19 is determined method, wherein, the quantity of the multi-stage data level that writes down in test zone is set to satisfy formula

β＝A+2

Wherein, β is illustrated in the quantity of the multi-stage data level that writes down in the test zone, and wherein, A represents the integer when the result of calculation of round-up 2R ÷ S, and wherein, 2R represents the spot diameter of luminous point, and wherein, S represents the length of test zone.

28. the record condition according to claim 27 is determined method, wherein, the Pretesting zone by omitting respectively that result of calculation by round down R ÷ S obtains and the multistage value in last test zone, obtain the reproducing signal that produces from test zone grade.

29. a recording method that is used for record multi-stage data on the track of the recording surface of CD, described recording method comprises step:

By using the suitable recording power and the Write strategy that in claim 1, obtain on the track of the recording surface of CD, to write down multi-stage data.

30. an optical disc apparatus that is used for record multi-stage data on the track of the recording surface of CD, described optical disc apparatus comprises:

Write part, be used for writing a plurality of multi-stage data levels with identical value at a plurality of test zones, each test zone have with the direction of the tangent line of track on designated length, described designated length is greater than the spot diameter of the luminous point that forms in orbit;

Obtain part, be used for obtaining suitable recording power and Write strategy according to the level of the reproducing signal that produces from test zone; And

Recording section is used for by using the recording power and the Write strategy that are obtained to write down multi-stage data on the track of the recording surface of CD.

31. according to the optical disc apparatus of claim 30, wherein, when maximal value and the difference between the minimum value in the level of reproducing signal obtain suitable recording power and Write strategy when being not more than reference value.

32. according to the optical disc apparatus of claim 31, wherein, described reference value is recorded in the CD.

33. the optical disc apparatus according to claim 31 also comprises:

Determining section is used for determining the type of CD;

34. according to the optical disc apparatus of claim 31, wherein, described reference value comprises the value that obtains by computing formula { | DR|/{ γ-(α-1) } },

Wherein, α is the value that is not less than 3 multi-stage data, and DR is in the reproducing signal level of posting field not and has wherein write down poor between the reproducing signal level in zone of maximum mark that γ is not less than 1 value.

35. according to the optical disc apparatus of claim 34, wherein, described multi-stage data comprises the multi-stage data corresponding to maximum mark, wherein, obtains described reference value by relating to the reproducing signal that produces from test zone.

36. according to the optical disc apparatus of claim 35, wherein, described recording section further writes down the reference value that is obtained in CD.

37. according to the optical disc apparatus of claim 30, wherein, when the mean value of the level of reproducing signal obtains suitable recording power and Write strategy when falling into preset range.

38. optical disc apparatus according to claim 30, wherein, when being not more than predetermined reference value, the difference between the mean value in the level of at least one and reproducing signal of the minimum value of the level of the maximal value of the level of reproducing signal and reproducing signal obtains suitable recording power and Write strategy.

39. according to the optical disc apparatus of claim 30, wherein, the quantity of the multi-stage data level that writes down in test zone is set to satisfy formula

β＝A+2，

40. according to the optical disc apparatus of claim 39, wherein, the Pretesting zone by omitting respectively that result of calculation by round down R ÷ S obtains and the multistage value in last test zone, obtain the reproducing signal that produces from test zone grade.

41. a program that is used for optical disc apparatus, described optical disc apparatus are used on the track of recording surface of CD and write down multi-stage data, described program comprises:

Write processing, be used for writing a plurality of multi-stage data levels with identical value at a plurality of test zones, each test zone have with the direction of the tangent line of track on designated length, described designated length is greater than the spot diameter of the luminous point that forms in orbit;

Obtain to handle, be used for obtaining suitable recording power and Write strategy according to the level of the reproducing signal that produces from test zone; And

Recording processing is used for by using the recording power and the Write strategy that are obtained to write down multi-stage data on the track of the recording surface of CD.

42. a computer readable recording medium storing program for performing comprises:

The described program of claim 41.

43. a recording method that is used at the recording layer identifying recording layer of CD, described recording method comprises step:

A) by the single at least preheat pulse of radiation on CD, recording layer is preheating to temperature less than the initial markers formation temperature, described preheat pulse has greater than the reproducing power of CD with less than the power level of the recording power of CD;

B) by the single at least main pulse of radiation on CD, recording layer is heated to the temperature that is equal to or greater than described initial markers formation temperature; Described main pulse has the power level identical with the recording power of CD.

44. according to the recording method of claim 43, wherein, described preheat pulse has 80% the power level that is not more than recording power.

45. according to the recording method of claim 43, wherein, described preheat pulse comprises first pulse and second pulse, wherein, described first pulse has the power level different with the power level of second pulse.

46. according to the recording method of claim 45, wherein, one of described first pulse and described second pulse have 40% the power level that is not more than recording power.

47. according to the recording method of claim 43, wherein, the data that write down in CD comprise the binarization data and have three values or at least one of more many-valued multi-stage data.

48. according to the recording method of claim 47, wherein, when being recorded to optical disc data and being the binarization data, the mark in the mark that forms on recording layer is that execution in step is a) the most in short-term.

49. according to the recording method of claim 43, wherein, described main pulse comprises monopulse at least.

50. according to the recording method of claim 43, wherein, the temperature of described recording layer had the point of temperature jump before reaching the initial markers formation temperature.

51. according to the recording method of claim 50, wherein, the temperature of recording layer is the point of temperature jump after the temperature of recording layer is not less than the initial markers formation temperature not.

52. an optical disc apparatus is used for the recording layer identifying recording layer at CD, described optical disc apparatus comprises:

Optic pick-up is used for by using pulse to launch radiation laser;

Regenerator section is used for by the single at least preheat pulse of radiation on CD recording layer is preheating to the temperature less than the initial markers formation temperature, and described preheat pulse has greater than the reproducing power of CD with less than the power level of the recording power of CD;

Heating part is used for by the single at least main pulse of radiation on CD recording layer being heated to the temperature that is equal to or greater than the initial markers formation temperature, and described main pulse has the power level identical with the recording power of CD.

53. according to the optical disc apparatus of claim 52, wherein, described preheat pulse has 80% the power level that is not more than recording power.

54. according to the optical disc apparatus of claim 52, wherein, described preheating comprises first pulse and second pulse, wherein, described first pulse has the power level different with the power level of second pulse.

55. according to the optical disc apparatus of claim 54, wherein, one of described first pulse and described second pulse have 40% the power level that is not more than recording power.

56. according to the optical disc apparatus of claim 52, wherein, the data that write down in CD comprise the binarization data and have three values or at least one of more many-valued multi-stage data.

57. according to the optical disc apparatus of claim 56, wherein, when being recorded to optical disc data and being the binarization data, the mark in the mark that forms on recording layer is to carry out described preheating the most in short-term.

58. according to the optical disc apparatus of claim 52, wherein, described main pulse comprises monopulse at least.

59. according to the optical disc apparatus of claim 52, wherein, the temperature of described recording layer had the point of temperature jump before reaching the initial markers formation temperature.

60. according to the optical disc apparatus of claim 59, wherein, the temperature of recording layer is the point of temperature jump after the temperature of recording layer is not less than the initial markers formation temperature not.