CN1774743A - Optical information recording medium, medium characteristic definition method, medium characteristic inspection method, signal detection method, signal detection circuit, and optical information recor - Google Patents
Optical information recording medium, medium characteristic definition method, medium characteristic inspection method, signal detection method, signal detection circuit, and optical information recor Download PDFInfo
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Abstract
There is provided an optical information recording medium having a plurality of recording layers where recording can be performed. Signal characteristics in a certain area X of the recording layer A (second layer) among the recording layers are defined by the condition that an area Y of the recording layer B (first layer) adjacent to the recording layer A (second layer) in the incident side on the optical axis of the optical beam irradiated to the area X is an already-recorded area. Thus, it is possible to suppress measurement irregularities and errors of the various signal characteristics due to the leak light from the adjacent recording layer and manage and define medium parameters with a high reliability, compatibility, and a characteristic value having a high reproducibility.
Description
Technical field
The present invention relates to the recordable optical information recording medium of having of the double-deck version of double-deck version, DVD ± R/RW as CD-R/RW and then multilayer recording medium in the future, its dielectric property prescriptive procedure, dielectric property inspection method and signal detecting method, signal deteching circuit, and optical information recording regenerator more than or equal to the sandwich construction of bilayer.
Background technology
In recent years, CD-R/RW or DVD ± R/RW we can say as the external memory of PC fixing.In addition, CD-R/RW or DVD ± R/RW will wish high capacity more from now on, and bilayerization, in the future further multiple stratification are also under study for action.
In such multilayered medium, generally set interfloor distance, so that the light of the reflection of the recording layer beyond from access does not bleed the reflected light of the recording layer in the self-access.If this is because far off from the focal position, then can't help lens and carry out optically focused and disperse from the reflected light of medium, therefore become as the negligible level of signal intensity.But, as optic restriction, must be the focus allowed band (depth of focus) that can obtain good various characteristics whole with interior setting multilayer, interfloor distance can't enlarge as desirable.Therefore, quite a few generation is bled from the catoptrical of other layer.
Here, as the example of the multilayer of practicability, the double-deck version of DVD-ROM is arranged.Because two-layer all is the regeneration special use of suppressing (stamp) in factory, so the surplus (margin) for various changes is also big, follow the trail of to adopt and use from being called DPD (Differential Phase Detection, the mode of the phase differential that the edge of regenerated signal differential phase detection) (edge) obtains changes and has guaranteed strong resistance the bleed light quantity (signal intensity) that causes of the reflected light from other layer.Certainly, owing to be that regeneration is special-purpose, thus needn't detect the swing (wobble) that the bending of track (groove) or track causes, few from the bleed defective that causes of other layer catoptrical.
In addition, the medium with a plurality of recordable layers for example is disclosed in the patent documentation 1,2 etc.In these inventions, but determined the thickness, material etc. of recording film characteristic, particularly recording film of the medium of multilayer record, thus the realization that improves the multilayer record.In addition, in the patent documentation 3, disclose each layer configuration swing, and in this swing, inserted address information multilayer recording medium.
And then as fundamental research, the realization of multilayer record improves constantly, and has also pointed out, invented essential technology therewith together.Certainly, in multilayered medium, essential various servosignals or swinging signal in order to improve interchangeability or to keep stabilized quality, are importantly managed these characteristics of signals, perhaps determine as standard.
Patent documentation 1: the spy opens the 2000-235733 communique
Patent documentation 1: the spy opens the 2003-091874 communique
Patent documentation 1: the spy opens the 2001-052342 communique
But, under the situation of multilayer recording medium, become big problem from catoptrical the bleeding of other layer.For example, be under the situation of not recording areas at the recording layer of adjacency, because the reflectivity height, so reflect wide.Because this catoptrical focus departs from, therefore can be on light receiving element optically focused fully, but owing to the original reflected light of the recording layer in the arrival self-access of bleeding, so reflected light is not represented correct value.Otherwise, be under the situation of recording areas at the recording layer of adjacency, because reflectivity is low, so the amount of bleeding is little.In addition, under the situation of multilayer, all bleed from any layer, but the baneful influence maximum of bleeding of special recording layer from adjacency.
Thereby the various characteristics of signals of recording medium are formed, are write down a plurality of parameter adjustments such as thickness, groove depth, groove width by recording film.Shown in patent documentation 1,2, the adjustment of recording film material is main in the recording characteristic.But, two patent documentation 1,2 all not shown various signal specifications.The track that obtains when here, ' the various signal ' shown in the scope of this instructions and claim has the light beam track that crosscut is carved by the groove that is called groove on medium intersects servosignals such as (track cross) signal and tracking error (tracking error) signal, the rotating speed of carving by the bending of other track that comprises medium or the swinging signal of address information etc.Certainly, not only these, regeneration (RF) signal amplitude also we can say equally.These characteristics of signals determine by the regulation of amplitude basically, from the different purpose of condition determinations such as the absorbing light beam intensity or the magnification of circuit, by with signal normalization after handle.But, from the reflected light of the recording layer of adjacency bleed and with signal in when producing error, the regulation that produces these errors incorrect defective that becomes.
In addition, alter a great deal according to optical system, therefore lack reliability, interchangeability is poor from catoptrical the bleeding of the recording layer of these adjacency.
Recording layer in adjacency is under the situation of recording areas, because reflectivity is low, so reflected light is little, the defective that bleeding of the recording layer in the access caused can reduce.
On the other hand, be under the situation of recording areas at the recording layer of adjacency, though very weak, its catoptrical record data component bleeds in the reflected light of the recording layer in the access.For servosignal because the signal band difference, thereby be out of question, but since swinging signal near the record data frequency band, therefore should be noted that.Thereby, being desirably in the quality regulation of swinging signal, the recording layer of regulation adjacency is the ratio of the C/N (carrier-to-noise ratio) under the situation about having write down.
Like this, therefore various signal specifications are considering that recording layer only is in the existing prescriptive procedure of 1 layer (individual layer) according to the recording status of the recording layer of adjacency (record or write down) and different, can't carry out the decision of stable properties management or standard figures.
Summary of the invention
The objective of the invention is to suppress measurement deviation, the error of the various characteristics of signals that the light that bleeds from the recording layer of adjacency causes, thereby can carry out management, regulation, the inspection of the medium parameter of reliability and interchangeability, characteristic value that reproducibility is high.
The present invention provides following optical information recording medium to achieve these goals.
A kind of optical information recording medium, in having the optical information recording medium of recordable a plurality of recording layers, various characteristics of signals in described a plurality of recording layer, among a certain regional X of certain recording layer A are that the condition of recording areas decides by the regional Y that is contiguous to the recording layer B of incident end for described recording layer A on the ray axis of the light beam that shines described regional X.Thus, suppress measurement deviation, the error of the various characteristics of signals that the light that bleeds from the recording layer of adjacency causes, thereby can carry out management, the regulation of the medium parameter of reliability and interchangeability, characteristic value that reproducibility is high.
In addition, the value of described various characteristics of signals also can be in described a plurality of recording layers with the value that equates as desired value.Thus, needn't can adopt cheap evaluating apparatus, record regenerator to handle in the characteristic of every layer of various testing circuit of change.
In addition, described various characteristics of signals also are the conditional decisions of recording areas not by described regional Y, and, different also passable with various characteristics of signals among the described regional X of the conditional decision that is recording areas at described regional Y.Thus, do not need to be used for record condition not and record condition two sides satisfy the adjustment of complexity of the various parameters of characteristics of signals, can shorten between development stage, in addition, can focus on the adjustment that the characteristic of the disadvantageous record condition of record regenerating action is improved.
In addition, in the described various characteristics of signals also can be the amplitude of the track cross signal that obtains when light beam crosscut track.Thus, the amplitude excursion of track cross signal is few, can obtain the good signal quality, and can tackle the fast record regenerator of access speed.
In addition, in the described various characteristics of signals also can be the amplitude of the track error signal that obtains when light beam crosscut track.Thus, the amplitude excursion of track error signal is few, can obtain the good signal quality, and can tackle the record regenerator of the fast and stable tracking performance of access speed.
In addition, in the described various characteristics of signals also can be the amplitude as the swinging signal of the curved component of track.Thus, the amplitude excursion of track error signal is few, can obtain the good signal quality, and can tackle the record regenerator of the fast and stable tracking performance of access speed.
In addition, in the described various characteristics of signals also can be the relative noise quality as the swinging signal of the curved component of track.Thus, good swinging signal quality can be obtained, and the fast and stable medium rotation of access speed and the record regenerator of address detected performance can be tackled.
And then, following dielectric property prescriptive procedure also is provided.
A kind of dielectric property prescriptive procedure, for optical information recording medium with recordable a plurality of recording layers, various characteristics of signals in described a plurality of recording layer, among a certain regional X of certain recording layer A are that the condition of recording areas decides by the regional Y that is contiguous to the recording layer B of incident end for described recording layer A on the ray axis of the light beam that shines described regional X.Thus, suppress measurement deviation, the error of the various characteristics of signals that the light that bleeds from the recording layer of adjacency causes, thereby can carry out management, the regulation of the medium parameter of reliability and interchangeability, characteristic value that reproducibility is high.
In addition, the value of described various characteristics of signals also can be in described a plurality of recording layers with the value that equates as desired value.Thus, needn't can adopt cheap evaluating apparatus, record regenerator to handle in the characteristic of every layer of various testing circuit of change.
In addition, described various characteristics of signals are the conditional decisions of recording areas not by described regional Y, and the various characteristics of signals differences in the described regional X of the conditional decision that described regional Y is a recording areas are also passable.Thus, do not need to be used for record condition not and record condition two sides satisfy the adjustment of complexity of the various parameters of characteristics of signals, can shorten between development stage, in addition, can focus on the adjustment that the characteristic of the disadvantageous record condition of record regenerating action is improved.
In addition, in the described various characteristics of signals also can be the amplitude of the track cross signal that obtains when light beam crosscut track.Thus, the amplitude excursion of track cross signal is few, can obtain the good signal quality, and can tackle the fast record regenerator of access speed.
In addition, in the described various characteristics of signals also can be the amplitude of the track error signal that obtains when light beam crosscut track.Thus, the amplitude excursion of track error signal is few, can obtain the good signal quality, and can tackle the record regenerator of the fast and stable tracking performance of access speed.
In addition, in the described various characteristics of signals also can be the amplitude as the swinging signal of the curved component of track.Thus, the amplitude excursion of track error signal is few, can obtain the good signal quality, and can tackle the record regenerator of the fast and stable tracking performance of access speed.
In addition, in the described various characteristics of signals also can be the relative noise quality as the swinging signal of the curved component of track.Thus, good swinging signal quality can be obtained, and the fast and stable medium rotation of access speed and the record regenerator of address detected performance can be tackled.
And then, following signal detecting method and signal deteching circuit also is provided.
A kind of signal detecting method, relatively in shining recordable a plurality of recording layers that optical information recording medium has, the regional Y that is connected to the recording layer B of incident end for described recording layer A on the ray axis of the light beam of a certain regional X of certain recording layer A is the reflected signal level of the described regional X in the condition of not recording areas, reflected signal level with described regional X in the described regional Y condition that is recording areas, and based on this comparative result, according to the recording status of described regional Y, carry out the magnification of the various signals among the described regional X or the change of skew (offset).
A kind of signal deteching circuit comprises: sample circuit keeps in recordable a plurality of recording layers that optical information recording medium has, the reflected signal level of a certain regional X of certain recording layer A; The recording status judging circuit, differentiating on the ray axis of the light beam that shines described regional X the regional Y that is contiguous to the recording layer B of incident end for recording layer A is not recording areas or recording areas; Memory circuit is a recording areas and under each situation of recording areas not at described regional Y, and storage remains on the output of the sample circuit that keeps in the described sample circuit; Comparator circuit, ask from the output of this memory circuit, the described regional Y signal during recording areas poor during for recording areas not and; Peaking circuit as control signal, changes the magnification or the skew of various signals with the reflected signal level of the output of this comparator circuit and described regional X; And alternative pack, according to the output of described recording status judging circuit, select whether to use the output of described comparator circuit as the control signal of described peaking circuit.Thus, irrelevant with the recording status of the recording layer of adjacency, can the detected amplitude change, the various signals of good quality that the skew change is few.
And then, following optical information recording regenerator also is provided.
A kind of optical information recording regenerator has: rotating mechanism, and rotation drives optical information recording medium; And pick-up (pickup), have light source, object lens,, receive reflected light simultaneously from described optical information recording medium to described optical information recording medium illumination beam, optical information recording medium with technical scheme 1 record is an object, carries out recording of information or regeneration.Thus, because above-mentioned optical information recording medium is carried out recording of information regeneration, thus irrelevant with the recording status of the recording layer of adjacency, can stably realize having the high servo performance of reliability, the information recording/reproducing apparatus of access performance at a high speed.
In addition, above-mentioned optical information recording regenerator also can load above-mentioned signal deteching circuit.Thus, irrelevant with the recording status of the recording layer of adjacency, can stably realize having the high servo performance of reliability, the information recording/reproducing apparatus of access performance at a high speed.
And then, following dielectric property inspection method also is provided.
A kind of dielectric property inspection method, it is dielectric property inspection method with optical information recording medium of recordable a plurality of recording layers, the regional Y that is contiguous to the recording layer B of incident end for this recording layer A on the ray axis of the light beam by becoming focus point in described regional X is the condition of recording areas, checks in described a plurality of recording layer, the various characteristics of signals among a certain regional X of certain recording layer A.Thus, suppress measurement deviation, the error of the various characteristics of signals that the light that bleeds from the recording layer of adjacency causes, thereby can carry out the inspection of the medium parameter of reliability and interchangeability, characteristic value that reproducibility is high.
In addition, the value of described various characteristics of signals also can be in described a plurality of recording layers with the value that equates as desired value.Thus, needn't can adopt cheap evaluating apparatus, record regenerator to handle in the characteristic of every layer of various testing circuit of change.
In addition, described various characteristics of signals are the conditional decisions of recording areas not by described regional Y, and the various characteristics of signals differences in the described regional X of the conditional decision that described regional Y is a recording areas are also passable.Thus, do not need to be used for record condition not and record condition two sides satisfy the adjustment of complexity of the various parameters of characteristics of signals, can shorten between development stage, in addition, can focus on the adjustment that the characteristic of the disadvantageous record condition of record regenerating action is improved.
In addition, in the described various characteristics of signals also can be the amplitude of the track cross signal that obtains when light beam crosscut track.Thus, the amplitude excursion of track cross signal is few, can obtain the good signal quality, and can tackle the fast record regenerator of access speed.
In addition, in the described various characteristics of signals also can be the amplitude of the track error signal that obtains when light beam crosscut track.Thus, the amplitude excursion of track error signal is few, can obtain the good signal quality, and can tackle the record regenerator of the fast and stable tracking performance of access speed.
In addition, in the described various characteristics of signals also can be the amplitude as the swinging signal of the curved component of track.Thus, the amplitude excursion of track error signal is few, can obtain the good signal quality, and can tackle the record regenerator of the fast and stable tracking performance of access speed.
In addition, in the described various characteristics of signals also can be the relative noise quality as the swinging signal of the curved component of track.Thus, good swinging signal quality can be obtained, and the fast and stable medium rotation of access speed and the record regenerator of address detected performance can be tackled.
According to the present invention, suppress measurement deviation, the error of the various characteristics of signals that the light that bleeds from the recording layer of adjacency causes, thereby can carry out management, regulation, the inspection of the medium parameter of reliability and interchangeability, characteristic value that reproducibility is high.
Description of drawings
Fig. 1 is the figure of the optical information recording medium also used in the general and present embodiment of expression.
Fig. 2 is the block scheme of the basic structure example of the expression signal Processing piece that extracts various signals.
Fig. 3 is used to illustrate the record of dual-layer recording medium, the synoptic diagram of regeneration principle.
Fig. 4 is the synoptic diagram from the catoptrical influence of each layer that is used to illustrate under the situation of dual-layer recording medium.
Fig. 5 is used for signal level explanation from the synoptic diagram from the catoptrical influence of each layer under the situation of dual-layer recording medium.
Fig. 6 is the block scheme of the structure example used of normalized of the various signals of expression.
Fig. 7 is the figure of the waveform example of expression track cross signal and track error signal.
Fig. 8 is the figure of the waveform example of expression swinging signal.
The figure of the waveform example of Fig. 9 swinging signal that to be expression detect from recording areas.
Figure 10 is the block scheme of an example of expression signal deteching circuit.
Figure 11 is other routine block scheme of expression signal deteching circuit.
Figure 12 is the block scheme of a structure example of expression optical disc apparatus.
The explanation of label
1 optical information recording medium
2 grooves (groove)
3 banks (land)
4 tracks
11 4 cut apart PD (photo decetor, photodetector) (light receiving element)
The 12I/V circuit
13 servo and wobble detection circuit
21LPF
22,25～28 amplifiers
23 amplitude detecting circuits
24 gain circuitries
29,42 peaking circuits
31,41 signal deteching circuits
32 recording status judging circuits
33 sample circuits
34 memory circuits
35 comparator circuits
36 on-off circuits (alternative pack)
37,43 totalizers
37 alternative packs
51 optical disc apparatus (optical information recording regenerator)
52 pick-ups
53 motor-drive circuits
54 semiconductor lasers (light source)
55 object lens
56 actuators
57 laser drive parts
58 strategies (strategy) generating unit
59 drive circuit for laser
The 60RF testing circuit
Embodiment
The mode that is used to implement the best of the present invention with reference to description of drawings.
Fig. 1 is the figure of a structure example of the optical information recording medium (media) 1 also used in the general and present embodiment of expression.Here, Fig. 1 (a) is the general view of medium 1, and Fig. 1 (b) is the general perspective that the part of extraction medium 1 is represented.
In medium 1, be formed with the track 4 that constitutes by groove (groove) and bank 3 with concentric circles or spiral fashion.This track 4 forms device by medium and is pre-formed.Information recording/reproducing apparatus carries out recording of information, regeneration along this track 4.In addition, in medium 1, as rotation information, under the situation of or angular velocity certain rotation certain with linear velocity, track 4 carries out bending, so that can detect the certain frequency signal in (cycle) (with reference to Fig. 1 (b)).In CD-RW or DVD+R/RW, the bending of this track 4 is made as general certain frequency, the part that changes frequency or phase place a little is set simultaneously, thus recording address information.In addition, the only situation of a lateral bending song of track is arranged also, or crooked situation of interrupting discontinuously.
Fig. 2 represents to receive the reflected light of the light beam that shines medium 1, and extracts an example of the signal Processing piece of various signals.Cut apart the reflected light that PD (light receiving element) 11 receives from medium 1 by four.This four fens cutover light are received element 11 by dividing into four optical receiving regions corresponding to the track tangential direction of medium face and the cut-off rule of perpendicular direction on the optics.For convenience each optical receiving region is begun by being made as A～D clockwise from left front.I/V circuit 12 will be voltage signal as the light receiving element output transform of current signal.In addition, by summing amplifier, subtracting amplifier, LPF (low-pass filter) or the HPF (Hi-pass filter) of servo and wobble detection circuit 13, from being extracted various signals the signal of voltage transformation.Track cross signal is the low frequency signal of the operation result of (A+B+C+D).Track error signal is the low frequency signal of (A+D)-(B+C).Swinging signal is the computing identical with track error signal, but high-frequency signal.Focus error signal is the low frequency signal of (A+C)-(B+D).In addition, regeneration (RF) signal preferably by other circuit computing of high frequency band, therefore do not put down in writing here, but computing is (A+B+C+D).
Here illustrated is the simple calculations method of various signals, but the segmented shape of light receiving element (PD) is not limited thereto certainly, also can further segment and cut, and cuts apart otherwise also can reduce 2,3.That is, as long as make the signal operation optimization just passable corresponding to each light-receiving mode.In addition, track error signal also can be DPD (differential phase detection) method.In addition, also can be situation from the various signals of a plurality of beam detection that constitute by master (main) and secondary (sub).For example, track error signal is to receive the situation that three light beams carry out the three-beam method of computing or DPP (Differential push-pull, differential push-pull) method etc.In addition, track cross signal also can carry out computing by three light beams.In addition, focusing system also can be a light receiving element.
In addition, swinging signal can also can insert various correcting circuits by the circuit computing different with track error signal before subtracting amplifier.
That is,, do not rely on method, the parts of drawing signal from this medium 1 as long as make operation method suitably just passable by detection method.
Fig. 3 is the figure that represents the synoptic diagram of dual-layer recording medium 1 as sandwich construction.Recording layer has the ground floor (being equivalent to recording layer B) and the second layer (being equivalent to recording layer A) two, and light beam incides ground floor.At ground floor, the energy that absorbs light beam with absorptivity " A1 " line item of going forward side by side.In addition because reflectivity " R1 " is different with space (space) (not recording areas) at mark (recording areas), so can be from the reflected light of ground floor the data of reading and recording.Simultaneously, the light beam that sees through with the transmitance " T1 " of ground floor recording film arrives the second layer.Carry out record at the second layer by the energy that absorbs with absorptivity " A2 ".Then, same with ground floor because the reflectivity " R2 " of the second layer is different with the space at mark, therefore can be from the reflected light of the second layer data of reading and recording.In detail, when the reflected light from the second layer sees through ground floor once more, absorb and reflect, but the reflection in the second layer constantly,, therefore do not carry out record in the moment that arrives ground floor for the second time because beam intensity fully weakens.That same phenomenon also takes place under the situation of multilayer is just passable as long as be thought of as.In addition, with the type of recording film be Worm type (R) still rewriting type (RW) is irrelevant, that same phenomenon takes place is just passable as long as be thought of as.
Fig. 4 is that being used for dual-layer recording medium 1 is the figure that example illustrates the flow direction of light beam.Fig. 4 (a) makes the focus of light beam focus on the situation of ground floor recording film.In addition, 1 light (outlet) is represented with solid line from the light source to the medium, is represented by dotted lines from the reflected light (return road) of medium 1.In addition, in Fig. 4, only represent from the path of the light of object lens one side incident for simplification.Light beam from object lens to medium accesses position (focus) optically focused.The ray axis of this light beam is represented with dot-and-dash line.Most light beam by the ground floor reflection returns object lens once more, though not shown here, be focused on the light receiving element (PD) through optical system on every side.On the other hand, return the object lens outside by the reflected light of the light beam by the object lens middle body in the second layer beam reflected, also disperse in the optical system before light receiving element even perhaps turn back to object lens, the situation that is directed into light receiving element is few.That is, the reflected light from the second layer bleeds fewer from the catoptrical situation of ground floor.
On the other hand, be situation about on the second layer, focusing at Fig. 4 (b).Same during with ground floor, the reflected light of the second layer that focuses on from focus turns back to object lens, and optically focused is to light receiving element.The light of object lens central authorities also returns object lens from the ground floor beam reflected, so optically focused is on light receiving element.But in Fig. 4 (a), about by the light of an end of the object lens of back light receiving element not, major part is returned object lens, so we can say in the optical system before light receiving element and disperse, the situation of light ratio Fig. 4 (a) that is directed into light receiving element is many.In addition, near the part enlarged drawing focus, the ground floor recording film is expressed as recording layer B, second layer recording film is expressed as recording layer A.In addition, the point with recording layer A, B on the ray axis is made as X point, Y point.In addition, the size of each point specifically is based on the zone (X zone, Y zone) of the beam diameter in each layer.
Like this, focus on situation on the ground floor and focus in the focus of light beam and focus under the situation on the second layer, change from the situation of bleeding of other layer.Specifically, under the situation of the layer (second layer) of plane of incidence access the inside, the reflected light of layer nearby (ground floor) bleeds and to produce the situation of baneful influence many.In addition, we can say that baneful influence reduces under nearby the layer situation few for recording status and reflection light quantity.
Fig. 5 is described with signal level.Upside represents that the signal level that obtains from the recording film reflected light of ground floor, downside represent the signal level that obtains from the recording film reflected light of the second layer.In addition, the Unrecorded situation of Fig. 5 (a) expression ground floor (recording layer B), the signal level under the situation that Fig. 5 (b) expression ground floor (recording layer B) has write down.In addition, the thick line among Fig. 5 is benchmark (GND) level, and the SIN ripple is to be the signal level of example with the track cross signal.And then, represent the to bleed skew of the signal level that causes of the little dotted line among Fig. 5.
Under the Unrecorded situation of ground floor shown in Fig. 5 (a) because reflection is wide, so the second layer is being carried out access and is receiving under the catoptrical situation, from the reflected light of ground floor bleed big, it is big that signal level becomes.Usually because the light that bleeds enters light receiving element integral body, therefore and light quantity become greatly.Because track cross signal is and signal, so produce the phenomenon that signal level increases.
Otherwise, shown in Fig. 5 (b), under the situation that ground floor has write down,,, influence little so when detecting the signal of the second layer, do not become big bleeding because reflected light is little.Hence one can see that, and the signal level of the second layer is subjected to recording status (do not write down or the write down) domination of ground floor significantly.In addition, as shown in Figure 5, the signal level of the second layer in the state that the signal level of ground floor and ground floor have write down about equally.
In the above description, be that example is illustrated simply with the track cross signal.But in practicality, the light quantity of light beam changes, the gain (magnification) of testing circuit waits according to the mensuration system and difference, thus the regulation of various signals usually by and signal (four cut apart following four addition of situation of light receiving element) normalization.Fig. 6 represents an example of this circuit block.With signal by the LPF21 equalization, by amplifier 22.The amplitude of this output or signal level are measured by amplitude detecting circuit 23, and by gain circuitry 24 decision magnifications, so that become the voltage (desired value) of target.Amplifier 22 is with this magnification amplifying signal.By this a series of action, normalization and signal are maintained at the voltage of target.Other signal (focusing on error signal, track cross signal, track error signal, swinging signal etc.) is also amplified by amplifier 25～28 with the magnification identical with it (output of gain circuitry), generates various normalized signals.The adjustment circuit of such amplitude is called AGC (automatic gain control) circuit (peaking circuit) 29.Certainly, these are handled after by the A/D converter digitizing, even data processing ground carries out also obtaining same effect.
By agc circuit 29 normalization various signals, by from catoptrical the bleeding of other layer and with signal in produced under the situation of error, it is incorrect that magnification becomes, and produces error in the signal regulation.Thereby expectation does not have the regulation from the characteristics of signals under the state that bleeds of the reflected signal of other layer.
Therefore, in the signal of the second layer in the present embodiment (recording layer A) regulation (amplitude etc.), (more generally, under the situation that adjoining course has write down) determines the specification of various characteristics of signals under the situation that ground floor (recording layer B) has write down.In addition, in the signal check (amplitude etc.) of the second layer in the present embodiment (recording layer A), (more generally under the situation that adjoining course has write down) carries out the inspection of various characteristics of signals under the situation that ground floor (recording layer B) has write down.In addition, various characteristics of signals also can be in a plurality of recording layers be desired value with the value that equates.
In addition, even under actual situation of carrying out record regenerating action, bleeding from the reflected light of other layer also produces baneful influence, so expectation can be carried out regeneration and record under the state that adjoining course write down.In described explanation, the layer that is desirably in nearby is under the state that has write down, carries out the order of access with the layer to the inside medium is carried out record.
Fig. 7 is to represent the figure of the waveform of track cross signal and track error signal with the relation of the track 4 of medium 1.Track cross signal is the waveform in the center signal level reduction of the bank 3 of recorded information (being made of mark and space).In addition, track error signal is zero friendship (zero-cross) signal waveform at the groove center.Specifically, owing to different, therefore be difficult to determine, be preferably about " normalization track cross signal＞0.1 " or " 0.22＜normalization track error signal＜0.8 " with the relation of recording density as characteristic value.Being particularly suitable for the blue laser is the recording density of light source, this be consider enlarge groove wide and advance narrow gauge trackization aspect, about " normalization track cross signal＞0 " or " 0.2＜normalization track error signal＜0.5 ".
Fig. 8 is the figure of the waveform example of expression swinging signal.Here, Fig. 8 (a) is the dullness that does not have modulation.In addition, the trochoidal wave form of Fig. 8 (b) FM modulation that has been overlapping.In order to comprise information such as address and insert modulation.Equally, the trochoidal wave form of PM modulation that Fig. 8 (c) has been overlapping, the trochoidal wave form of sawtooth modulation that Fig. 8 (d) has been overlapping, the trochoidal wave form of MSK modulation that Fig. 8 (e) has been overlapping, the trochoidal wave form of ON-OFF modulation that Fig. 8 (f) has been overlapping.Certainly be not limited to these examples, the characteristic of swinging signal is also determined by amplitude usually.Not directly from stipulating with signal, but it is more from the situation of track error signal (being also referred to as push-pull signal) regulation, since track error signal self by with signal regulation, therefore and signal owing to the reflected light from adjoining course has error, the regulation of swinging signal can not be trusted.Therefore, identical with servosignal, because the regulation of the characteristic value of error need not take place from catoptrical the bleeding of multilayer.Specifically, as characteristic value, be preferably about " 0.05＜normalization swinging signal＜0.3 ".
The figure of the waveform example of Fig. 9 swinging signal that to be expression detect from recording areas.A+D, B+C are the totalizer output in the servo and wobble detection circuit 13 in the block scheme of Fig. 2, (A+D)-(B+C) are swinging signals.A+D and B+C signal are compared with swinging signal, are the states of imbedding wobble component in the strong data-signal of signal intensity.Here, by calculating both difference, except overlap onto the data-signal on two signals as in-phase component, can also the wobble detection signal.But, because the influence of the shape of optical aberration or medium inclination, record mark etc. when the intensity of overlapping data-signal produces difference on two signals of A+D and B+C, can not be removed data-signal fully from swinging signal, and residual as noise.Usually, wobble quality is stipulated by C/N (carrier wave ratio noise).Under the situation of existing individual layer record, specifically, though according to hunting frequency and difference is preferably about " swinging C/N value＞31dB ".This is under the catoptrical situation of bleeding in abutting connection with recording layer that has write down, because therefore overlapping data-signal component on the reflected light becomes noise for swinging signal, quality reduces.To the incomplete optically focused of light beam of adjacency recording layer, so the intensity of high fdrequency component such as data-signal is so not strong, but swinging signal compare with data-signal, only can obtain very little amplitude, therefore can not ignore.Therefore, the regulation of swinging signal quality is also same with amplitude regulation, is desirably under the state that has write down in abutting connection with recording layer to carry out.
In addition, if only under the situation that the recording layer of adjacency has all write down, carry out record regenerating, as long as just can according to its regulation design circuit characteristic.But, under Unrecorded situation, also carry out record regenerating as far as possible.Therefore,, consider to measure in advance the catoptrical amount of bleeding, and proofread and correct according to the recording status of the recording layer of adjacency that it is poor under the Unrecorded situation of the recording layer of adjacency and under the situation about having write down.In addition, under the Unrecorded condition of ground floor (recording layer B), also determine various characteristics of signals, and also can make them different with various characteristics of signals in the definite second layer (recording layer A) of the condition that has write down by ground floor (recording layer B).
Figure 10 and Figure 11 represent to be used for to obtain in advance reflected light from other layer rank (level) of bleeding, thereby and it are proofreaied and correct the circuit structure of the signal deteching circuit 31,41 that correctly detects various signals.Figure 10 is the figure of an example that expression comprises the signal deteching circuit of agc circuit, Figure 11 be illustrated in Figure 10 agc circuit designs simplification an example of signal deteching circuit.In addition, the part that the various signals that are represented by dotted lines among two figure are used can be a plurality of with identical structure connection equally with Fig. 2, and can be corresponding with various signals (focus error signal, track cross signal etc.).In explanation owing to be identical circuit, so omit.
At first, the access record layer of recording status judging circuit 32 differentiation purposes is not recording areas or recording areas in abutting connection with recording layer.This is the regenerating medium directorial area in advance, and infers in the comparison of its external information and current access site.Can certainly with by the detected result of other parts as external information.In this recording status judging circuit 32, affirmation is in abutting connection with the recording status of recording layer, simultaneously sample circuit 33 two conditions that do not write down and write down with the recording layer of adjacency keep and the reflected signal level (can be peak swing or mean value) of signal, and the result who stores these level by memory circuit 34.At this moment, the recording layer in the access need all be made as two conditions the same terms that does not write down or write down.The recording layer of the adjacency that memory circuit 34 will be stored be Unrecorded situation and signal level and situation about having write down output to comparator circuit 35 with signal level.Two of comparator circuit 35 computings and signal level poor.According to the output of recording status judging circuit 32, determine whether using the control line of the output signal of this comparator circuit 35 as peaking circuit (agc circuit) 29 via totalizer 37 by making on-off circuit (alternative pack) 36 connection-shutoffs.
As concrete example, under the Unrecorded situation of the recording layer of adjacency, owing to catoptrically bleed greatly, so control line connects, and uses as the control line of peaking circuit 29, and turn-offs control line and do not use under situation about having write down.Peaking circuit among Figure 10 (dot-and-dash line) 29 constitute with by the circuit same shown in Figure 6 with agc circuit signal normalization.Carry out being made as the action of desired value with voltage of signals, but by by 37 pairs of totalizers should and signal add the outputs of (or deducting) comparator circuit 35, can remove with signal level owing to the part of bleeding and being offset from the recording layer of adjacency.In addition, not only be offset but also gain and also can carry out same action.That is, by target voltage, as long as it is just passable to be set at the target voltage of removing with the part of signal bias according to the output of comparator circuit 35 change gain circuitry 24.Same with the explanation of Fig. 6, if be made as with the amplifier 25～28 identical and constitute, then by carrying out normalization with signal with the magnification of signal by being used for magnification with various signals.
Figure 12 is the figure of a structure example of expression optical disc apparatus (optical information recording regenerator) 51.Optical disc apparatus 51 can be divided into the pick-up 52 that has loaded optical system, the motor-drive circuit 53, the various circuit that move or rotate optical information recording medium (media) 1 of pick-up 52.
In addition, pick-up 52 comprises: as the semiconductor laser 54 of the light source of light beam, light beam is imported the optics of each element, the object lens 55 that are beam condensers to the medium 1, control in order to make luminous point follow the trail of the actuator 56 of the lens position of the position that requires, to receive the catoptrical light receiving element (PD) 11 from CD 1.
In addition, circuit is the drive circuit for laser 59 that the tactful generating unit 58 of the laser drive part 57 of the luminous electric current of semiconductor laser 54 and decision record and regeneration luminescent waveform is constituted by decision.Therefore the electric current of semiconductor laser 54 light output characteristics relatively changes greatly according to temperature, generally is mounted with detection by the light intensity of laser drive part 57 outputs and make the stable output control function of output.The detection of light intensity can be used light receiving element built-in in the semiconductor laser 54, also can construct the optical system of not shown special use., from the user data of external transmission is transformed to recorded information the scrambler by controls such as CPU after, is sent to drive circuit for laser 59 and is recorded in the medium 1 as record data from scrambler.
As other circuit, the reflected signal from medium 1 that is received by light receiving element 11 carries out the current/voltage conversion by I/V circuit 12, and is sent to RF testing circuit 60 or servo and wobble detection circuit 13.This I/V circuit 12 is in the position of primary circuit, sets suitable conversion efficiency (gain) when being preferably in regeneration and during record respectively.RF testing circuit 60 extracts the information component that is recorded in the medium 1, and the information component of extracting is sent to demoder.In addition, the information component that is transmitted is transformed to user data by demoder.
In the servo-drive system of the servo and wobble detection circuit 13 that comprises as described signal deteching circuit 31,41 etc., extract the positional information of point, and, pick-up 52 or actuator 56 are moved to for the motor-drive circuit 53 that makes luminous point follow the trail of the position that requires sends indication.Focusing between multilayer (focus) is moved and is also undertaken by the mobile of actuator 56.In addition, in oscillation system, push-pull signal based on the difference of the output in the light receiving element of being cut apart by the cut-off rule two of the track tangential direction on the medium 1 11 extracts the swinging signal component that is engraved on the track 4, and be sent to for example address detection circuit or clock forming circuit etc., be used for the management of the absolute position on the medium 1 or clock generation, the medium Spin Control synchronous with the medium rotation.
Claims (25)
1. an optical information recording medium has recordable a plurality of recording layer, it is characterized in that,
Various characteristics of signals in described a plurality of recording layer, among a certain regional X of certain recording layer A are that the condition of recording areas determines by the regional Y that is contiguous to the recording layer B of incident end for described recording layer A on the ray axis of the light beam that shines described regional X.
2. optical information recording medium as claimed in claim 1 is characterized in that,
The value of described various characteristics of signals in described a plurality of recording layers with the value that equates as desired value.
3. optical information recording medium as claimed in claim 1 is characterized in that,
Described various characteristics of signals is the conditional decision of recording areas not by described regional Y also, and, different with various characteristics of signals among the described regional X of the conditional decision that is recording areas at described regional Y.
4. optical information recording medium as claimed in claim 1 is characterized in that,
One of described various characteristics of signals is the amplitude of the track cross signal that obtains when light beam crosscut track.
5. optical information recording medium as claimed in claim 1 is characterized in that,
One of described various characteristics of signals is the amplitude of the track error signal that obtains when light beam crosscut track.
6. optical information recording medium as claimed in claim 1 is characterized in that,
One of described various characteristics of signals is the amplitude as the swinging signal of the curved component of track.
7. optical information recording medium as claimed in claim 1 is characterized in that,
One of described various characteristics of signals is the relative noise quality as the swinging signal of the curved component of track.
8. a dielectric property prescriptive procedure is characterized in that,
For optical information recording medium with recordable a plurality of recording layers, various characteristics of signals in described a plurality of recording layer, among a certain regional X of certain recording layer A are that the condition of recording areas determines by the regional Y that is contiguous to the recording layer B of incident end for described recording layer A on the ray axis of the light beam that shines described regional X.
9. dielectric property prescriptive procedure as claimed in claim 8 is characterized in that,
The value of described various characteristics of signals in described a plurality of recording layers with the value that equates as desired value.
10. dielectric property prescriptive procedure as claimed in claim 8 is characterized in that,
The condition that described various characteristics of signals is a not recording areas at described regional Y is also made decision, and, different with various characteristics of signals among the described regional X of the conditional decision that is recording areas at described regional Y.
11. dielectric property prescriptive procedure as claimed in claim 8 is characterized in that,
One of described various characteristics of signals is the amplitude of the track cross signal that obtains when light beam crosscut track.
12. dielectric property prescriptive procedure as claimed in claim 8 is characterized in that,
One of described various characteristics of signals is the amplitude of the track error signal that obtains when light beam crosscut track.
13. dielectric property prescriptive procedure as claimed in claim 8 is characterized in that,
One of described various characteristics of signals is the amplitude as the swinging signal of the curved component of track.
14. dielectric property prescriptive procedure as claimed in claim 8 is characterized in that,
One of described various characteristics of signals is the relative noise quality as the swinging signal of the curved component of track.
15. signal detecting method, relatively in shining recordable a plurality of recording layers that optical information recording medium has, the ray axis of the light beam of a certain regional X of certain recording layer A of regional Y be connected to the recording layer B of incident end on to(for) described recording layer A is the reflected signal level of the described regional X in the condition of not recording areas, reflected signal level with described regional X in the described regional Y condition that is recording areas, and based on this comparative result, according to the recording status of described regional Y, carry out the magnification of the various signals among the described regional X or the change of skew.
16. a signal deteching circuit is characterized in that comprising:
Sample circuit keeps in recordable a plurality of recording layers that optical information recording medium has or the reflected signal level of a certain regional X of recording layer A;
The recording status judging circuit, differentiating on the ray axis of the light beam that shines described regional X the regional Y that is contiguous to the recording layer B of incident end for recording layer A is not recording areas or recording areas;
Memory circuit is a recording areas and under each situation of recording areas not at described regional Y, and storage remains on the output of the sample circuit that keeps in the described sample circuit;
Comparator circuit, ask from the output of this memory circuit, the described regional Y signal during recording areas poor during for recording areas not and;
Peaking circuit as control signal, changes the magnification or the skew of various signals with the reflected signal level of the output of this comparator circuit and described regional X; And
Alternative pack according to the output of described recording status judging circuit, selects whether to use as the control signal of described peaking circuit the output of described comparator circuit.
17. an optical information recording regenerator is characterized in that,
Have: rotating mechanism, rotation drives optical information recording medium; And
Pick-up has light source, object lens, to described optical information recording medium illumination beam, receives the reflected light from described optical information recording medium simultaneously,
Optical information recording medium with claim 1 record is an object, carries out recording of information or regeneration.
18. optical information recording regenerator as claimed in claim 17 is characterized in that,
Be mounted with the described signal deteching circuit of claim 16.
19. a dielectric property inspection method is the dielectric property inspection method with optical information recording medium of recordable a plurality of recording layers, it is characterized in that,
Various characteristics of signals in described a plurality of recording layer, among a certain regional X of certain recording layer A are that the condition of recording areas is checked according to the regional Y that is contiguous to the recording layer B of incident end for this recording layer A on the ray axis of the light beam that becomes focus point in described regional X.
20. dielectric property inspection method as claimed in claim 19 is characterized in that,
The value of described various characteristics of signals in described a plurality of recording layers with the value that equates as desired value.
21. dielectric property inspection method as claimed in claim 19 is characterized in that,
Described various characteristics of signals also checks under the condition that described regional Y is a not recording areas, and, different with various characteristics of signals among the described regional X that the condition that is recording areas at described regional Y is checked.
22. dielectric property inspection method as claimed in claim 19 is characterized in that,
One of described various characteristics of signals is the amplitude of the track cross signal that obtains when light beam crosscut track.
23. dielectric property inspection method as claimed in claim 19 is characterized in that,
One of described various characteristics of signals is the amplitude of the track error signal that obtains when light beam crosscut track.
24. dielectric property inspection method as claimed in claim 19 is characterized in that,
One of described various characteristics of signals is the amplitude as the swinging signal of the curved component of track.
25. dielectric property inspection method as claimed in claim 19 is characterized in that,
One of described various characteristics of signals is the relative noise quality as the swinging signal of the curved component of track.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP298630/2003 | 2003-08-22 | ||
| JP2003298630 | 2003-08-22 | ||
| JP157352/2004 | 2004-05-27 |
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| CN1774743A true CN1774743A (en) | 2006-05-17 |
| CN100358014C CN100358014C (en) | 2007-12-26 |
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| CNB2004800097800A Expired - Fee Related CN100358014C (en) | 2003-08-22 | 2004-07-29 | Optical information recording medium, medium characteristic definition method, medium characteristic inspection method, signal detection method, signal detection circuit, and optical information recor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR960015450A (en) * | 1994-10-31 | 1996-05-22 | 배순훈 | Multilayer optical disc |
| US6240054B1 (en) * | 1996-05-15 | 2001-05-29 | Pioneer Electronic Corporation | Multiple layer disk reproducing apparatus, and apparatus for reproducing information record medium |
| EP1124221B1 (en) * | 1998-10-21 | 2006-12-13 | Matsushita Electric Industrial Co., Ltd. | Optical information recording medium, and method and apparatus for recording and reproduction |
| AU5566200A (en) * | 1999-06-22 | 2001-01-09 | Matsushita Electric Industrial Co., Ltd. | Optical disk, optical disk device, and reproducing method for optical disk |
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