CN1012329B - Information recording medium disk and its preparing mehtod - Google Patents
Information recording medium disk and its preparing mehtodInfo
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- CN1012329B CN1012329B CN 85106617 CN85106617A CN1012329B CN 1012329 B CN1012329 B CN 1012329B CN 85106617 CN85106617 CN 85106617 CN 85106617 A CN85106617 A CN 85106617A CN 1012329 B CN1012329 B CN 1012329B
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Abstract
The present invention relates to an improved tracking guide groove of an optical recording information disc. In the past, the recording of an address signal, a speed control signal or similar signals in the guide groove depends on the depth variation of the guide groove, and the problem that the electrical level of a detection signal is not matched with the electrical level of a record signal always exists. According to the present invention and as shown in picture 1, the depth of the guide groove is constant and the width of the guide groove is variable, such as Wa and Wb; thus, when the signal is recorded, the electrical level of the detection signal can easily achieve the ideal electrical level, and the guide groove with constant depth and variable width can be prepared by a method of exposure on a light resistance layer by laser beams with adjustable intensity.
Description
The present invention relates to a kind of information recording medium disk and preparation method thereof, wherein, when recording layer recording information signal on above-mentioned information recording medium disk or when this recording layer regenerates information signal, perhaps the employed reference signal of following of the tracking control operation of all carrying out under these two kinds of situations generates guide groove, and being designed to its groove width in advance can be changed by another information signal.
Along with at present in various technical fields to the high density recording of information signal and an urgent demand of regeneration.People have proposed the various forms of schemes of utilizing information recording carrier to carry out the high density recording and the regeneration of information signal.
As everyone knows, can write down easily and the regenerating information signal as a kind of, and the record information signal can easily wipe in case again the record (rewriting) information signal recording medium, magnetic recording media normally constitutes recording layer by ferromagnetic material.Yet, a kind of information recording carrier of recording layer that has has been proposed recently as the information medium that can write down, regenerate and write down again on substrate, above-mentioned recording layer is by making such as materials such as TeOx, Ge, Sn, on these materials, add electromagnetic wave or electric field or heating and the time can produce phase transformation from amorphous state to the crystal attitude, or from the crystal attitude to amorphous phase transformation.A kind of information recording carrier has also been proposed, its recording layer is made on substrate, and above-mentioned recording layer is to constitute (magnetic film is made of as MnBi, MnCuBi, GdCO etc. storage) by magnetic film this film is carried out thermo magnetic recording (as so-called Curie-point temperature record or compensation temperature record).Such information recording carrier has been used to record and much higher density record and the regenerating information signal of reproducing density with the magnetic recording media more general than employing.
And the problem of thereupon bringing be the tracking spacing must constriction, could realize the high density recording and the regeneration of information signal so satisfactorily.Yet under the situation of this narrow tracking spacing, the track that is difficult on the information recording carrier is accurately followed the trail of a record cell, regeneration unit or record and regeneration unit.Therefore, people have adopted various tracking control methods to solve the above problems scheming.These methods are still comprising the high more device that needs high mechanical precision of recording density as pen recorder, and to prevent the offside problem of track in recording process, the result is involving great expense of device.
Overcoming the top mentions the method for problem and has been suggested.That is exactly, (information recording medium disk) adopts trickle luminous point to carry out the record and the regeneration of information signal in a dish-type information recording carrier, and what a the tracking reference signal of preparation in advance that resembles on this information recording medium disk described in No. the 576457643/83rd, the Japanese Laid-Open Patent Application generates guide groove; In the recording layer on information recording medium disk, all can use this tracking reference signal to generate guide groove during recorded information or when this recording layer regenerates regenerated signal or the tracking control operation of carrying out in these two.
(wherein signal generation guide groove is to prepare in advance as described in the front) just is used to produce the tracking reference signal if the tracking reference signal in the information recording carrier generates guide groove, then provides the predetermined width and the degree of depth to groove.Yet, generally, only utilize above-mentioned tracking reference signal to generate the part of guide groove, in this guide groove in advance regularly (following pattern of wiping) for example record the out of Memory signal, address signal, speed control signal and other desired signal.
More particularly, the part of tracking reference signal generation guide groove is as described above to be to write down the out of Memory signal with being used for fixing, and up to the present the pattern of other signal of record of Cai Yonging as shown in Figure 5.The degree of depth basis of tracking reference signal generation guide groove will be recorded in the out of Memory signal change there.
Fig. 5 (a) is a planimetric map, shows the part of the tracking reference signal generation guide groove in the information recording medium disk, and Fig. 5 (b) is the longitudinal profile side view along the line A-A of Fig. 5 (a).
The out of Memory signal that writes down in the tracking reference signal generates guide groove writes down according to depth difference as shown in Figure 5.In information recording medium disk, the out of Memory signal occurs by groove and absent variable state writes down.Therefore, in a regenerating unit, other information signal can be read by the difference of the diffraction corons of reading optical beam.
In addition, and the corresponding part of information signal " I " and and the light reflectivity of the corresponding part of information signal " O " between the recording layer of difference as information recording medium disk in the record that writes down and the target of regeneration, this just provides recording layer (for example by TeOx, Ge, Sn, thereby the recording layer that material is made has produced the phase transformation from the amorphous state to the crystalline state, or the phase transformation from the crystalline state to the amorphous state, perhaps recording layer is formed by magnetic film that (material that for example forms magnetic film is Mn, Bi, MnCuBi, CdCO) be subjected to thermo magnetic recording (as so-called Curie-point temperature record, or compensation temperature record)), very low with the reflection of light rate of the corresponding part of information signal " 0 ", maximum is percent 25.
On the other hand; in common information recording medium disk; other signal (such as, address signal, speed control signal and other required signal) is that the difference predetermined fixed ground (can wipe form) according to the degree of depth is recorded in the tracking reference signal and generates on the part of guide groove.Information recording medium disk is designed to prepare tracking reference signal generation guide groove in the mode of top theory.But have like this a problem promptly from the tracking reference signal generate signal level that guide groove produces and from be recorded in the tracking reference signal generate the out of Memory signal the guide groove part regenerated signal signal level with in recording layer, write down and from be recorded in recording layer the signal level of born again information signal compare higher easily.
The regenerated signal output that is generated the guide groove modulation by the tracking reference signal that obtains when with optical regeneration device the information recording medium disk that has the tracking reference signal and generate guide groove being regenerated will be discussed below, and above-mentioned problem will be explained seriatim also.(" modulation " used herein this term has following definition: i.e. the information signal of from information recording medium disk, reading by optical regeneration device, optical readout device with optical instrument be incident upon on the information recording medium disk read light by the tracking reference signal generate that the light quantity that turns back to optical regeneration device behind the guide groove diffraction and optical regeneration device take place to read the ratio that light is incident upon between the light quantity that turns back to optical regeneration device when not having the tracking reference signal to generate on the information recording medium disk of guide groove be a modulation factor.
Make α (ξ, η) be the amplitude distribution in the zone of incident light on the light projector lens of optical regeneration device; in E(X, the Y at object lens aperture place) be the PHASE DISTRIBUTION of tracking reference signal generation guide groove; f(ξ, η) be the distribution of amplitudes of light on the light projector lens face that generates the guide groove diffraction by the tracking reference signal, generate distribution of amplitudes f(ξ, the η of light on the light projector lens face of guide groove diffraction by the tracking reference signal) provide by following equation.In equation, i is an imaginary number, and K is the constant by light wavelength and object lens decision.
Because f(ξ, η shown in the above-mentioned equation) be with the far-field pattern equivalence of object lens, generate the regenerated signal output that guide groove is modulated so might calculate one by the tracking reference signal with digital form.
In Fig. 3, the digital ring NA of the object lens of optical regeneration device is 0.5, reads the wavelength that light has 7800 dusts, and its intensity distributions is Gaussian distribution, and (its light intensity is l/e at core to read the luminous flux of light
2) project information recording medium disk from optical regeneration device.Tracking reference signal on information recording medium disk generates guide groove a wall surface with the information recording medium disk Surface Vertical, and in information recording medium disk on the plane of incidence of light the optical index of medium be 1.5.The width that the tracking reference signal generates guide groove is calculated as 7000 dusts, and 9000 dusts and 11000 dusts, abscissa axis represent that the tracking reference signal produces the depth d (dust) of guide groove, and axis of ordinates is represented modulation factor (%).Among Fig. 3, curve (1), (2) and (3) represent that respectively the width of tracking reference signal generation guide groove is 7000 dusts, 9000 dusts and 11000 dusts.
In the above under the situation of described example; the depth value d(that the tracking reference signal generates guide groove obtains the tracking reference signal from optical regeneration device at this place be maximal value) be that 650 dust tracking reference signals generate the signal of the guide groove depth d when maximum according to following relation of plane acquisition, that is:
d＝β/8η
Suppose optical regeneration device such as above-mentionedly illustrated be used for regenerating information signal from the information recording medium disk of routine with can not wiping the mode predetermined fixed (wherein to be recorded into other information signal; address signal for example; speed control signal and other signal that needs); it is previously prepared that the tracking reference signal that has the tracking reference signal to generate the part of guide groove in information recording medium disk generates guide groove, and the depth d of the signal of the obtained maximum of tracking reference signal generation guide groove is 650 dusts.Optical regeneration device can obtain from curve (1) to (3) according to the modulation factor that the reference signal of falling the tracking generates the tracking reference signal that guide groove produced.In information recording medium disk, when the width of tracking reference signal generation guide groove is 7000 dusts.At the modulation factor shown in the curve (1) is 37.3%; When its width is 9000 dusts, be 26.5% at the modulation factor shown in the curve (2); When width was 11000 dusts, the modulation factor shown in the curve (3) was 16.4%.
In information recording medium disk; the width that the tracking reference signal generates guide groove depends on the diameter that projects luminous point on the information recording medium disk and the size of tracking spacing; but when using the optical regeneration device shown in the above-described example; when the tracking separation in the information recording medium disk equaled 2 μ m to 1.6 μ m approx, the width that the tracking reference signal generates guide groove was defined in the scope of 7000 dust to 11000 dusts.Under many circumstances, the out of Memory signal that is recorded in the tracking reference signal generation guide groove is than being used to write down and regenerate the lower signal of purpose information signal frequency.So the regenerated signal that generates guide groove according to the tracking reference signal has higher level.Like this; in the signal level that will be higher than the regenerated signal of the target that is used to the information recording medium disk to write down and regenerates when information recording medium disk carries out information signal regenerating by the signal level that generates the regenerated signal of guide groove modulation through the tracking reference signal of optical regeneration device regeneration; perhaps not very big difference between the signal level of two above-mentioned signals; therefore, in information recording medium disk, to regenerate and be used to write down and the regenerated signal of the purpose of regenerating is very difficult.
It is about 10% that the modulation factor of the regenerated signal by the tracking reference signal being generated the guide groove modulation is decided to be, and then can solve the above-mentioned problem of mentioning.Yet in the method for prior art, modulation factor must be reduced by the degree of depth that reduces cycle basis calibration signal generation guide groove.But it is very little that the modulation factor that the tracking reference signal is generated the regenerated signal of guide groove modulation fixes on about 10% desired groove depth, just can not understand with reference to Fig. 3.Therefore be difficult to accurately form shallow slot with even degree of depth by the method for photo-sensitive resin being exposed and developing.If groove is as described above when doing very shallowly, the signal level of the tracking reference signal of regeneration is just low, thereby solution must be provided.
The invention provides an information recording medium disk; when prepared beforehand on this information recording medium disk had toward the recording layer recording information signal of information recording medium disk the time or from the recording layer of information recording medium disk the regenerating information signal, perhaps employed tracking reference signal generated guide groove in the tracking control operation of all carrying out under these two kinds of situations.Above-mentioned tracking reference signal generates guide groove and comprises its well width according to the groove that changes of the information signal of record in advance in the information recording medium disk, promptly the tracking reference signal generate need do when well width in the guide groove changes approximately constant.Yet in the conventional method of preparation information recording medium disk, the difficult problem that usually runs into is a information recording medium disk how stably to make a sort of structure recited above.The invention provides a method for preparing information-recording disk, this method be included on the substrate cover have be equivalent to the spiral or the coaxial circles degree of depth certain thickness one-tenth photopolymer resin layer to form the device of information recording medium disk; Be used to make the laser beam on the information recording medium disk to do the relevant device that moves.Make the track of laser beam on information recording medium disk, form the relative flat shape of guide groove with spirality to be formed or coaxial circle; Be used to make the device of amount of beam change, change according to amount of beam, groove width can change according to the information signal that is used as the center intensity value with amount of beam, thereby in the information recording medium disk spirality of formation or that part of photosensitive resin layer of coaxial circular trough being exposed.
Fig. 1 is the planimetric map that generates guide groove according to tracking reference signal in the information recording medium disk of the present invention.
Fig. 2 shows the waveform of a regenerated signal.
Fig. 3 and Fig. 4 are characteristic curvees.
Fig. 5 (a) and (b) be respectively planimetric map and the longitudinal sectional drawing that tracking reference signal on the common information recording medium disk generates guide groove.
Fig. 6 is a block diagram, shows the structural representation that uses prepared according to the methods of the invention information recording medium disk pen recorder.
Fig. 7 has illustrated the variation of light quantity in recording process.
Fig. 8 shows the relation between the degree of depth that exposure and tracking reference signal generate guide groove.
Fig. 9 shows the relation between the groove width that exposure and tracking reference signal generate guide groove.
Describe information recording medium disk of the present invention below with reference to accompanying drawings in detail.
Fig. 1 is a planimetric map, shows the part that the tracking reference signal generates guide groove, and purpose is to be used for illustrating that the present invention's tracking reference signal generates the various tactic patterns (interface of groove is an irregular quadrilateral) of guide groove.
In (a) to (c), reference character D is represented information recording medium disk among Fig. 1, and symbol G is the tracking reference signal generation guide groove of preparation on dish D.For graphic concise and to the point for the purpose of, only show a tracking reference signal generation guide groove G among Fig. 1 among each figure of (a) to (c).Should be noted that, be to have many tracking reference signals to generate guide grooves with the tracking separation of rule and be listed in its surface in the information recording medium disk D of reality.
With reference to (a) among Fig. 1 to (c), generating the part of representing groove width among the guide groove G with W in the tracking reference signal is the part that the original tracking reference signal that is formed on the information recording medium disk D generates the tracking reference signal generation guide groove G of guide groove G when not using the present invention that its width is controlled.
Groove width is that groove width is that the Gb of Wb partly is that to generate groove width among the guide groove G be W width W partly to the tracking reference signal by being recorded in the part that broadens and narrow down after out of Memory signal in the information recording medium disk is modulated regularly among the Ga part of Wa and Fig. 1 (a) to (c) among Fig. 1 (a) to (c).Should be noted that even at the groove width W that has nothing in common with each other, the degree of depth of groove G, Ga and Gb is unlikely identical among G, the Ga of Wa and Wb and the Gb.
Embodiment according to information recording medium disk of the present invention has been shown among Fig. 1 (a); wherein; it is W that the tracking reference signal generates its original width of guide groove Ga() be modulated to groove width Wa, groove width Wa is wideer than the out of Memory signal being recorded in regularly the original guide groove W of tracking reference signal generation guide groove in the information recording medium disk.In addition, in Fig. 1 (b), also show embodiment according to information recording medium disk of the present invention.Wherein, it is W that the tracking reference signal generates its original groove width of guide groove G() to be modulated to groove width be Wb, groove width Wb is narrower than the out of Memory signal being recorded in regularly the original groove width W of tracking reference signal generation guide groove in the information recording medium disk.In addition, also show embodiment among Fig. 1 (c) according to information recording medium disk of the present invention, wherein, it is W that the tracking reference signal generates its original groove width of guide groove G() be modulated onto groove width Wa, it is wide that groove width Wa is recorded in the original groove width W of out of Memory signal tracking reference signal generation guide groove in the information recording medium disk regularly than first; Be modulated to Wb by groove width Wb again.Second out of Memory signal that is recorded in the information recording carrier disk regularly, the original width W that generates guide groove than tracking reference signal is narrow.
As mentioned above; in information recording medium disk according to the present invention (arriving the embodiment shown in (c)) as Fig. 1 (a); it is W that the tracking reference signal generates its original groove width of guide groove G() the out of Memory signal that is recorded in regularly in the information recording medium disk is modulated to groove width Wa or groove width Wb; they are wideer or narrow than the original groove width W of tracking reference signal generation guide groove respectively, but the degree of depth is constant.Yet should be noted that: during the wide variety of the guide groove that the degree of depth remains unchanged, modulation factor changes according to the variation of width.
Fig. 4 shows the constant tracking reference signal of groove depth and generates the modulation factor of guide groove how along with the variation of well width changes.Fig. 4 has represented an example, and the degree of depth is that modulation factor that the tracking reference signal of 650 dusts generates guide groove is to change according to the variation shown in the ordinate relevant with the shown guide groove width of horizontal ordinate.
For the aforesaid degree of depth is that the tracking reference signal of a constant generates for the guide groove, and the modulation factor of the tracking reference signal generation guide groove that the groove width that Fig. 1 (a) to (c) illustrates changes is that the variation according to groove width changes.Therefore, when forming regenerated signal by the signal of optical regeneration device gained, signal amplitude must the tracking reference signal generates the width of guide groove and changes.For example, shown in Figure 2.
Regenerated signal shown in the prior figures 2 is to obtain when guide groove is regenerated from being generated by the tracking reference signal of the modulation back wide variety of the out of Memory signal as shown in Fig. 1 (c) (as W-Wa-W-Wb-W-Wa).Horizontal ordinate has been pointed out the time, and ordinate has been pointed out the intensity of regenerated signal.
Can find out expressly from the description of front, in information recording medium disk, under groove depth keeps constant state, the width that the tracking reference signal generates guide groove is to be changed by the out of Memory signal that will fixedly be recorded in information recording medium disk, so that therefore change the modulation factor number according to width.When groove width from W by other signal change to Wa or when W changes to Wb, the basic modulation factor number that is obtained by information signal can be that part of modulation factor of W and groove width are the difference of that part of modulation factor of Wa from groove width, and perhaps groove width is that the modulation factor of W and difference that groove width is that part of modulation factor of Wb obtain.Therefore, suitably be provided with and be recorded in the variable quantity that tracking reference signal that the out of Memory signal in the information recording medium disk causes generates the width of guide groove regularly and just suitable modulation factor can be set.
The above-mentioned fact will be described with reference to the example of Fig. 4 below, and Fig. 4 shows the relation between groove width and the modulation factor (its groove depth is 650A °).
The width that generates guide groove in the tracking reference signal changes.Make the modulation factor that is produced by the out of Memory signal that will be recorded in regularly in the information recording medium disk be approximately at 10% o'clock, the width that the tracking reference signal generates guide groove also can change.Curve from Fig. 4, for example, from 9000A ° to 7000A ° or for example from 9000A ° to 11000A °.
Should be noted that; in information recording medium disk according to the present invention, tracking reference signal above-mentioned generates guide groove can generate guide groove as tracking reference signal being covered with one deck recording layer in the substrate and having on the information recording medium disk surface of groove of predetermined cross-sectional.Above-mentioned recording layer can write down effectively, regenerates and wipe, and can write down (rewriting) and recording information signal to high-density.Give an example, this recording layer can be formed by material (TeOx, Ge, Sa), generation is from the amorphous state to the crystalline state or by the phase transformation of crystalline state to amorphous state, or form by magnetic film that (material that can form magnetic film for example has MnBi, MnCuBiGdGo), carry out thermo magnetic recording (as so-called Curie-point temperature record or compensation temperature record).
Fig. 6 is a block scheme, shows the structural representation of information signal recorder, and this device is used for preparing above-mentioned information recording medium disk according to the present invention.Device among Fig. 6 comprises a lasing light emitter, a light modulation system, a signal source 3,4 one optical systems 5 of a reverberator, an information recording medium disk D, the signal that turntable 6 and motor 7 are exported by signal source 3 light modulation system 2 from lasing light emitter 1 emitted laser carries out intensity modulated, supplies with optical systems 5 by reverberator 4 then.
In the example of mentioning in front such optical system 5 as shown in FIG. 1.A laser beam (it has this interface shape consequently can form the tracking reference signal generation guide groove 9 with predetermined flat shape by the mode of out of Memory signal change groove width on the information recording medium disk D) is radiated on the photoresist layer Da of information recording medium disk D.
Information recording medium disk D is fixed on the turntable 6, turntable 6 rotates by motor 7 drivings and with desired speed, optical system 5 is driven by transmit machine 8 with predetermined pattern on the diametric(al) of information recording medium disk, wherein, carry out spiral to the photo-sensitive resin Da of information recording medium disk D or the irradiation of coaxial circles formula from above-mentioned optical system 5 emitted laser bundles.
Generate corresponding to the tracking reference signal that among information recording medium disk D, forms from the position that optical system 5 is added to the laser beam on the photo-sensitive resin Da of information recording medium disk D guide groove G flat shape time shaft variation and change have the tracking reference signal generation guide groove G that is given depth and predetermined flat shape basically so that can in information recording medium disk D, form.If the tracking reference signal that forms among the information recording medium disk D generates the flat shape of guide groove G shown in Fig. 1 (c); then from optical system 5 emitted laser bundles with corresponding to the Strength Changes pattern with respect to time shaft shown in Figure 7, shine on the photo-sensitive resin Da of information recording medium disk D.
Among Fig. 7, horizontal ordinate express time, ordinate are represented the laser beam irradiation that sends from optical system 5 light quantity to the photosensitive resin layer Da of information recording medium disk D.Reference symbol II c shows from what optical system 5 was sent and is designated as the light quantity of laser beam of that part of G of W corresponding to groove width.(amount of its laser beam can make whole thickness exposure, it shows the value in the light quantity center of laser beam, intensity of laser beam changes according to information signal, and this light quantity mainly is the shape by laser beam, and the light sensitive characteristic of the photosensitive resin layer of application and developing property are determined).Among Fig. 7 in the ordinate Ih pointed out that the groove width that generates the guide groove G corresponding to the tracking reference signal shown in Fig. 1 of launching from optical system 5 is the laser beam light quantity of the Ga part of Wa.Symbol I 1 in Fig. 7 ordinate shows from what optical system 5 was launched and generates the light quantity of laser beam that groove width the guide groove G is the part of Wb corresponding to the tracking reference signal shown in Fig. 1.
Is t by step of exposure and development treatment step at thickness
0Photosensitive resin layer Da in the tracking reference signal that forms generate the degree of depth of guide groove and the relation between the exposure as shown in Figure 8.Family curve explanation shown in Fig. 8 when exposure is It, is t at its thickness of photosensitive resin layer Da(
0) on will to form the degree of depth be that the tracking reference signal of t generates guide groove.
Fig. 9 is a characteristic curve, and wherein horizontal ordinate has been pointed out exposure, and ordinate has been pointed out the well width by the development treatment acquisition.Shown in characteristic curve among Fig. 9, during near exposure surpasses 7I0 value, with respect to the variable quantity of the groove width of variation of exposure descend, the inclination that tends towards stability of characteristic curve simultaneously.
Showing in the relationship characteristic curve between exposure and the groove width in Fig. 9, the inclination of curve is in exposure I0 and begins to tend towards stability I
0The exposure at place depends on the lasing aperture shape and presents different value.Usually, when photosensitive resin layer Da by aforesaid exposure I
0When almost equal light exposed, information recording medium disk can be with stable form preparation.Symbol It. in the table 9 is the exposure It shown in the described Fig. 8 in front.
In the method for preparing information recording medium disk according to the present invention; the laser beam intensity that sends the photosensitive resin layer Da that shines information recording medium disk D from optical system 5 is set to such state; promptly aforesaid, change in the flat shape corresponding to the tracking reference signal generation guide groove 9 that on information recording medium disk D, forms on the time shaft.The laser beam lithography amount that is transmitted into from optical system 5 on the photosensitive resin layer Da of information recording medium disk D is that the part of the groove of W is can be to covering the whole thickness t of photosensitive resin layer on the information recording medium disk D at width
0The laser beam I of exposure
0Light quantity (light quantity at the central value place of laser beam light quantity is I
0, its intensity changes according to information signal).When the groove width among the tracking reference signal generation guide groove G becomes Wa, Wb, the light quantity I at laser beam central value place
cTo change to I
h, I
lIn the case, if the central value of laser beam light quantity is arranged on exposure I
oNear, just the characteristic sloping portion of the relation between exposure and the groove width tend towards stability the place exposure I
oNear and amount light quantity I
oBe not arranged on exposure I
oNear situation is compared, and recording operation is stably carried out.
When using the method for preparing information recording medium disk of the present invention, desirable pattern is that the thickness of the photoresist layer of information recording medium disk D is set to t
0, and the intensity that laser beam has should be able to satisfy following relational expression:
I
t＜I
l＜I
o＝I
c＜I
h
As shown in Figure 9, by the photoresist layer Da of laser beam lithography, having above-mentioned thickness is t
o
When information recording medium disk during with the rotation of angular velocity equably, the exposure in the record is applied so-called radial compensation, also be a kind of desirable pattern.
From above detailed explanation, obviously, according to the invention provides an information medium dish.Wherein, the tracking reference signal generation guide groove that is used for the control operation of tracking benchmark is a prepared beforehand; it during the regenerating information signal, perhaps is used in the tracking control operation of all carrying out under these two kinds of situations when recording information signal in the recording layer of information recording medium disk or from the recording layer of information recording medium disk.The tracking reference signal generates guide groove and has the groove width that information signal changed that writes down in advance by in the information recording medium disk.Therefore; when the width that makes the tracking reference signal generate guide groove by the fixing out of Memory signal that is recorded in the information recording medium disk becomes Wa or when W becomes Wb from W, the actual modulated factor of information signal can be used as the modulation factor that obtains in the W width segments and the difference of the modulation factor that obtains in the Wa width segments or the difference of the modulation factor that obtains as the modulation factor that obtains in the W width segments with in the Wb width segments does not obtain.Modulation factor can be provided with by means of the out of Memory signal that is recorded in information recording medium disk regularly.The mode that the tracking benchmark generates the variable quantity of guide groove width f suitably is provided with.In addition, be uninterrupted continuous state because the tracking reference signal generates guide groove.Even the signal that is recorded in the information recording medium disk in the tracking reference signal produces guide groove is under the situation about can wipe, and the signal of record still can well be regenerated.Also have, under the effect of a plurality of information signals, change to Wa and Wb respectively respectively, shown in Fig. 1 (c), then might carry out multiple recording, and can regenerate them individually by spoke value partition method to two kinds of signals if the tracking reference signal produces the width of guide groove 1.
In addition, the present invention also provides a kind of method of making information-recording disk (wherein, width with spiral or coaxial circular trough of actual given depth is to change so that recording information signal according to information signal), comprise being used on substrate, covering device with certain thickness photosensitive resin layer.The spiral that the thickness of this photosensitive resin layer is equivalent to form on information recording medium disk or the concentration of coaxial circular groove; Make information recording medium disk and laser beam carry out the device of relative motion, this device makes the track of laser beam corresponding to spirality that will form on information recording medium disk or circular concentric guide groove; And the quantitative changeization that makes light beam.The width that makes groove will be that the information signal of center intensity value changes so that the whole thickness of photosensitive resin layer of the part of the spiral section that will form or coaxial circular groove is exposed according to the light quantity with laser beam.Therefore, can use simple optical system and light modulation system easily to obtain needed tracking reference signal and produce guide groove, and the tracking reference signal generates the width of guide groove by the out of Memory signal change.In addition, the central value I of exposure
cCan be arranged on exposure I
0Near, this means that mild part place in the characteristic curve that concerns can a stable form obtains the tracking reference signal and generates guide groove between exposure and slot plug.Also have, be set to a given degree of depth t because the tracking reference signal generates the degree of depth of guide groove
0So, can realize obtaining in the stable form output of tracking error signal.That is to say, can be stably generate the record that recording layer on the guide groove carries out information signal, erase and regenerative operation covering the tracking reference signal.Like this, can overcome the problem that all prior arts exist according to information recording medium disk of the present invention and preparation method thereof.
Claims (2)
1, a kind of information recording medium disk; it is characterized in that: when recording layer recording information signal on above-mentioned information recording medium disk or when this recording layer regenerates information signal; perhaps the employed tracking reference signal of the tracking control operation of all carrying out under these two kinds of situations generates guide groove, and above-mentioned tracking reference signal generates guide groove and comprises that its groove width will be recorded in advance by one that information signal is changed on the information recording medium disk.
2, the method for preparing information recording medium disk, it is characterized in that: having basically, the spirality of given depth and the width of coaxial circular trough are to change according to information signal to come recording information signal, the preparation method comprises and is used on substrate covering the device with certain thickness photoresist layer, the thickness of this photoresist layer is equivalent to the helicla flute that will form and the degree of depth of coaxial circular groove on information recording medium disk, be used to make laser beam on the information recording medium disk to do the device of relevant motion, the track of the laser beam that this device sends has formed the guide groove of spirality or coaxial circle in information recording medium disk, be used to make the device of amount of beam change, according to the change of amount of beam.Groove width can be according to changing with the information signal of amount of beam as the center intensity value, thereby the helicla flute that forms in the information recording medium disk or the whole thickness of the photoresist layer in coaxial grooves or the coaxial circles slot part are exposed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85106617 CN1012329B (en) | 1985-09-02 | 1985-09-02 | Information recording medium disk and its preparing mehtod |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85106617 CN1012329B (en) | 1985-09-02 | 1985-09-02 | Information recording medium disk and its preparing mehtod |
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| Publication Number | Publication Date |
|---|---|
| CN85106617A CN85106617A (en) | 1987-03-25 |
| CN1012329B true CN1012329B (en) | 1991-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85106617 Expired CN1012329B (en) | 1985-09-02 | 1985-09-02 | Information recording medium disk and its preparing mehtod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1012329B (en) |
-
1985
- 1985-09-02 CN CN 85106617 patent/CN1012329B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN85106617A (en) | 1987-03-25 |
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