JP3277733B2 - Method and apparatus for recording optical information on optical disc - Google Patents

Method and apparatus for recording optical information on optical disc

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Publication number
JP3277733B2
JP3277733B2 JP31659494A JP31659494A JP3277733B2 JP 3277733 B2 JP3277733 B2 JP 3277733B2 JP 31659494 A JP31659494 A JP 31659494A JP 31659494 A JP31659494 A JP 31659494A JP 3277733 B2 JP3277733 B2 JP 3277733B2
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Prior art keywords
recording
waveform
optical
zone
method
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JPH08180413A (en
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嘉孝 坂上
鋭二 大野
信夫 赤平
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松下電器産業株式会社
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Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk recording method and apparatus for recording and reproducing information at high speed and high density by using optical means such as a laser beam.

[0002]

2. Description of the Related Art Techniques for reproducing or recording high-density information using a laser beam are well known, and are mainly put to practical use as optical disks.

[0003] Optical disks can be broadly classified into a read-only type, a write-once type, and a rewritable type. The read-only type has been put into practical use as a compact disk or a laser disk, and the write-once type or rewritable type has been put into practical use as a document file, a data file or the like. Among rewritable optical disks, there are mainly magneto-optical and phase change types. The phase change optical disk utilizes the fact that the recording layer reversibly changes its state between amorphous and crystalline (or between crystalline and further different crystalline) by irradiation of a laser beam. This is because at least one of the refractive index and the extinction coefficient of the thin film is changed by laser beam irradiation, and recording is performed. At this point, the amplitude of the transmitted light or reflected light changes, and as a result, the transmitted light reaches the detection system. A signal is reproduced by detecting that the light amount or the reflected light amount changes. Alloys such as Te, Se, In, and Sb are mainly used as materials that cause a state change between amorphous and crystalline.

In a phase change optical disk, one-beam overwriting can be used for rewriting a recording mark. 1
Beam overwriting is a method of recording a new signal while erasing an already recorded old signal by irradiating a signal track with a laser power modulated between a recording level and an erasing level by a recording signal. . The region irradiated at the recording level becomes amorphous because it cools after melting, regardless of whether the original state is amorphous or crystalline, and the region irradiated at the erase level rises above the crystallization temperature, regardless of the original state. Crystallization, and the new signal is overwritten.

Further, there has been proposed a recording method in which a recording waveform for forming one recording mark is composed of a recording pulse train composed of a plurality of pulses (hereinafter, multi-pulse recording) (for example, Japanese Patent Application No. 1-323369). ).

[0006] In an optical disk recording / reproducing apparatus, there are roughly two types of optical disk rotation systems. A method of rotating the disk so that the linear velocities are the same on the inner and outer circumferences of the disk (hereinafter, CLV) and a method of rotating the disk at a constant angular velocity (hereinafter, CAV). For example, when high-speed access is required as in a data file used for an external memory for a computer or the like, it takes time to change the disk rotation speed, so CAV is used. The linear velocity in the circumferential direction is faster at the outer periphery and slower at the inner periphery.

[0007]

When a physical state change is caused by irradiating light from a semiconductor laser in an optical disk device, for example, in order to obtain good recording / reproducing characteristics in an optical disk using a rewritable phase change material. It is indispensable to stably form amorphous recording marks and to realize a sufficient erasing rate. However, in the CAV mode, the erasing rate decreases at the outer periphery where the linear velocity is high, and conversely, a recording mark of a sufficient size cannot be formed or the mark distortion occurs at the inner periphery where the linear velocity is low. This is because the time required for the laser spot to pass through one point on the signal track becomes shorter at the outer circumference, resulting in insufficient crystallization, resulting in erasure. The reason for this is that, since it is small, it is recrystallized and is not sufficiently made amorphous. Both the unerased portion and the mark distortion, etc., have become distortions and noises in the reproduced waveform, causing reproduction jitter. As a method of solving this problem, we increase the crystallization speed in the outer peripheral zone from the inner peripheral zone, increase the thickness of the reflective layer in the inner peripheral zone from the outer peripheral zone, reduce the thickness of the recording layer, and reduce the dielectric layer side dielectric. We propose a disk having zones with different thin film configurations in the radial direction, such as thinning the layers. However, in order to further increase the margin and stability of recording and reproduction, it is necessary to further reduce reproduction jitter.

[0008] The present invention solves the above-mentioned problems, and the C
It is an object of the present invention to provide a recording method that realizes stable formation of amorphous recording marks over the entire inner and outer circumferences of a disk in an AV mode.

[0009]

According to the present invention, there is provided a recording method comprising:
Change recording layer that causes a reversible phase change between crystal and crystalline phase
, The dielectric layer, and the reflective layer are formed on the substrate at least in this order.
Optical disks stacked on a disc and input signals for information to be recorded
Wave whose waveform is corrected by a predetermined waveform correction method
Shape correction means, and a recording wave output from the waveform correction means
Laser driver that emits laser light according to the shape signal
And a laser drive output from the laser drive means.
A laser spot is illuminated on the optical disk in response to a motion signal.
Using a laser beam irradiating means.
Irradiate the laser beam while rotating the laser at a constant angular speed.
A recording mark corresponding to a recording waveform signal on the optical disk.
A method for recording optical information for forming
Of the phase change recording layer, dielectric layer and reflective layer
At least one layer configuration is the center of the optical disc.
Is different for each of the multiple zones where
Change the waveform correction method of the waveform correction means for each zone
It is characterized by the following.

As a device for realizing the recording method, a recording device that detects a zone where a laser spot is located and switches the recording waveform correction in accordance with the zone is proposed.

[0011]

[Function] By optimizing the recording waveform according to the zone,
Recording with less mark distortion from the inner circumference to the outer circumference can be performed.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

First, FIG. 1 shows a specific recording waveform shape employed in this embodiment. (A) is an EFM (Eight
4 is an example of an input waveform of a to Fourteen Modulation signal. EFM modulation is 3T to 11T
The data is modulated by a combination of signals having nine types of lengths, and T is a clock here.
(B) shows a recording waveform B when recording the input waveform of (a).
In this figure, the leading portion of each input waveform is cut off by 1.5T from the input waveform of (a). (C) is a recording waveform C in the case of recording the input waveform of (a), which is obtained by cutting the leading portion of each input waveform from the input waveform of (a) by 1.75T. (D) is a multi-pulse recording waveform D in the case of recording the input waveform of (a), wherein the width of the first pulse in the short pulse train is 1.5T, and the width and interval of the subsequent pulse are both 0.5T. . (E) is a recording waveform E in which the leading pulse width in the short pulse train is equal to 1.5T and the succeeding pulse width is increased to 0.75T from the recording waveform D.
(F) is a recording waveform F in which only the last pulse in the subsequent pulse train is wider than the recording waveform D by 0.75T.

The structure of the disk used in this embodiment will be described with reference to FIG. The dielectric layer, the recording layer, and the reflection layer are formed on a transparent substrate by a method such as vacuum evaporation or sputtering. On a substrate 21, a first dielectric 22, a recording layer 23, a second dielectric layer 24, and a reflective layer 25 are sequentially provided. Further, a transparent and closely adhered protective layer 26 is provided thereon. In FIG. 2, the inner circumferential zone 27 in the disk radial direction is used.
And the outer zone 28, the zone is
More than one optical disc can also be created. There is also an optical disk having a structure without the reflective layer 25 and the protective layer 26. Laser light for recording and reproduction is made incident from the substrate 21 side.

The material of the substrate 21 can be glass, quartz, polycarbonate, or polymethyl methacrylate. The substrate may be a smooth flat plate or may have grooves on the surface for tracking guide.

As the protective layer 26, a material obtained by dissolving a resin in a solvent and applying and drying the resin or a material obtained by bonding a resin plate with an adhesive can be used.

As the recording layer material used for the recording layer 23, a chalcogen alloy which changes the phase between amorphous and crystalline is often used. For example, SbTe type, GeSbTe type, G
eSbTeSe system, GeSbTePd system, TeGeSnA
u-based, AgSbTe-based, GeTe-based, GaSb-based, InSe
System, InSb system, InSbTe system, InSbSe system, InS
A bTeAg system or the like can be used.

When GeSbTe is used as a recording layer material, in particular, xGeTe + (1-x) Sb 2 Te 3 + ySb
A material having a composition satisfying (0 <x ≦ 1, y ≧ 0) is suitable as a material for a rewritable phase-change optical disc. In this regard, the Japanese Journal of Applied Physics 26 (1987) pp. 61-66 (Japanese Journal of Japan)
Applied Physics, Vol. 26 (19
87) 61-66).

The dielectric layers 22 and 24 are made of SiO 2 , S
iO, TiO 2, MgO, Ta 2 O 5, Al 2 O 3, Ge
O 2 , Si 3 N 4 , BN, AlN, SiC, ZnS, Zn
Se, ZnTe, PbS, etc., or a mixture thereof can be used.

Au, Al, Cu, C
A material mainly composed of a metal material such as r, Ni, Ti, or a mixture thereof, or a dielectric multilayer film having a large reflectance at a predetermined wavelength can be used.

The characteristics of a disk using the recording method of the present invention are described below.
The sign is that the thin film configuration differs in the inner and outer zones.
is there. For example, increase the crystallization speed in the outer zone from the inner zone.
This is a faster disk. Optical disk in CAV mode
When rotated, the erasure rate decreases at the outer periphery where the linear velocity is high.
Occurs, and conversely, a sufficiently large
Recording marks cannot be formed or mark distortion occurs.
In some cases, causing reproduction jitter. But,
Increasing the crystallization rate of the recording layer toward the outer
The erasure rate at the outer periphery could be made almost equal. Crystallization rate
To change it, Sb should be used in the GeSbTe-based recording layer.
Change the amount, or further add a fourth element
This was possible. For example, xGeTe + (1-
x) Sb TwoTeThree (0 <x ≦ 1)
If Sb is added to the solution, the crystallization speed becomes slow. Furthermore, G
Ag, Cu, Co, Tl, Pd, ternary system of eSbTe
Crystals are added even when Au, Bi, Se, Sn, Pt, and Ni are added.
The conversion speed can be reduced. Furthermore, thickening the reflective layer and recording
The thickness of the recording layer and the thickness of the reflective layer
Cooling rate can be increased, and as a result
Good amorphous marks can be formed and jitter is small.
Came.

In the present invention, these discs are
In a plurality of zones, a recording waveform for forming one recording mark is corrected for a recording laser beam waveform for each zone, and a recording device that switches the recording waveform correction according to the zone is proposed from the inner periphery. It is characterized by enabling recording with less mark distortion up to the outer periphery.

Hereinafter, the present invention will be described in more detail with reference to specific examples. (Example 1) When the recording waveform was changed from the recording waveforms B and C in FIG. 1 for each zone of the disk in which the thickness of the reflective layer was optimized for the CAV mode on the inner and outer circumferences, that is, the single pulse length was changed. The case will be described. FIG. 7 shows the structure of the disk. As a disk having a different reflective layer thickness in the inner and outer peripheral zones, a substrate having a φ130 mm polycarbonate signal recording track was used. In this disc, a radius of 22 mm or more and less than 40 mm is defined as an inner peripheral zone, and a radius of 40 mm.
The area of not less than 58 mm was defined as the outer peripheral zone. A ZnS—SiO 2 mixed film having a thickness of 13 as a first dielectric layer is formed on the substrate.
It was formed by 00 ° sputtering. The recording layer composition is G
e 21.6 Sb 24.3 Te 54.1 ; (2GeTe + Sb 2 Te 3 +
0.25 Sb), a recording layer was formed at 250 °, and a ZnS—SiO 2 mixed film was formed as a second dielectric layer at a thickness of 200 °. After forming an Al film at 1250Al,
An Al film was formed on the inner periphery by sputtering at 750 ° using a mask 31 having a hole only in the inner periphery as shown in FIG. That is, the thicknesses of the reflective layers in the outer peripheral zone and the inner peripheral zone were 1250 ° and 2000 °, respectively. Then, a protective layer of polycarbonate was provided thereon.

When manufacturing a disk in which the thickness of the dielectric layer and the thickness of the recording layer are changed in the inner and outer peripheral zones, when sputtering the layer whose thickness is to be changed, the inner peripheral portion sputtering mask 31 of FIG. 4 outer peripheral portion sputtering mask 41
May be used to control the film thickness. The masks 31 and 41 may also be used when producing a disk in which the composition of the recording layer is changed between the inner and outer peripheral zones.

The above optical disc evaluation conditions are as follows: the wavelength of the laser beam is 780 nm, the NA of the objective lens of the optical head used for recording and reproduction of the recording device is 0.55, the disc rotation speed is 1000 rpm, and the shortest mark length is always the EFM signal. Recording was performed 100 times by one-beam overwriting while changing the clock T so as to be 0.90 μm, and the jitter value at the zero-cross point of the 3T reproduced signal: σ / Tw (%) was calculated with a radius of 23,
It measured at the position of 30, 37, 43, 50, and 57 mm.
Here, σ is the standard deviation of the jitter, and Tw is the window width of the detection system. The respective linear velocities at the radii are about 2.4, 3.1, 3.9, 4.5, 5.2, 6..
0 m / s. For each disk and each zone, the signal was recorded at a single frequency at which the recording mark length was 0.9 μm, the recording power at which the C / N was saturated, and the erasure rate was reduced when the signal was erased. 20dB
The power of the median value of the power margin exceeding is set.

Here, the optical disk device of the present invention will be described with reference to FIG. The optical disk 51 is attached to a spindle motor 52 and rotates at a constant rotation speed. The optical head 53 uses a semiconductor laser as a light source, and forms a laser spot on an optical disk by a collimator lens, an objective lens, and the like. The semiconductor laser is driven by a laser drive circuit 54. When recording a signal, the input signal is a waveform correction circuit A55 and a waveform correction circuit B56.
After the waveform is corrected by one of the circuits, the signal is input to the laser drive circuit 54.

When recording a signal, the apparatus first irradiates a laser spot onto the optical disk 51, reads an address signal provided in advance on a signal track by an address reproducing circuit 57, and switches a waveform correcting means by a switch 59. select.

Table 1 shows the relationship between the radius and the jitter for each recording waveform.

[0029]

[Table 1]

As shown in Table 1, when the recording waveform B is used, good recording marks are not formed in the inner peripheral portion due to heat build-up, and the jitter is very poor. On the other hand, the laser power was more appropriate at the outer periphery than at the inner periphery, and had a better jitter value than at the inner periphery.

When the recording waveform C is used, since the heat build-up at the inner peripheral portion is smaller than that of the recording waveform B and the mark distortion is smaller, the jitter is better than that of the recording waveform B. On the other hand, the laser power in the outer peripheral portion is less than that in the case of the recording waveform B, and the jitter value is worse because no longitudinally symmetric recording mark is formed.

On the other hand, when the recording waveform C is used for the inner circumference and the recording waveform B is used for the outer circumference according to the present invention, a relatively good recording mark can be formed because the recording waveform is improved in each zone as described above. It can be formed and the jitter value becomes small.

As described above, by correcting the recording waveform for each zone, it is possible to perform recording with small jitter on the entire surface of the disk.

In this embodiment, 2 is used as the waveform correcting means.
Although one waveform correction circuit is used, a plurality of different types of correction means may be used.

(Embodiment 2) A description will be given of a case where the leading pulse width of the recording waveform D shown in FIG. 1 is changed for each zone of the disk in which the thickness of the reflective layer is optimized for the CAV mode on the inner and outer circumferences.

The same disk as in Example 1 was used.
The recording waveforms used in this embodiment are the following two types. That is, only when the recording waveform D in FIG. 1 and the recording mark interval (interval of the input waveform being 0) are 3T, only the first pulse of the multipulse for forming the next recording mark is 0.
The recording waveform D2 is the same as the recording waveform D when the recording mark interval is 4T to 11T when the recording mark interval is 4T to 11T.

Table 2 shows the relationship between the radius and the jitter for each recording waveform.

[0038]

[Table 2]

According to Table 2, when the recording waveform D is used, when the recording mark interval is small in the inner peripheral portion, the recording mark is distorted and the jitter is deteriorated due to thermal interference from the immediately preceding recording mark. On the other hand, the laser power is suitable in the outer peripheral portion, and has a better jitter value than in the inner peripheral portion.

When the recording waveform D2 is used, thermal interference from the immediately preceding recording mark is suppressed in the inner peripheral portion, and jitter is suppressed because the mark distortion is small. On the other hand, since the thermal interference is originally small in the outer peripheral portion, the mark shape is distorted due to insufficient laser power and the jitter value is worse than in the case of the recording waveform D.

On the other hand, the recording waveform D2 at the inner circumference according to the present invention is
When the recording waveform D is used on the outer periphery, the recording waveform is optimized in each zone as described above, so that a good recording mark can be formed and the jitter value decreases.

By correcting the recording waveform for each zone as described above, it is possible to perform recording with small jitter on the entire surface of the disk.

In this embodiment, 2 is used as the waveform correcting means.
Although one waveform correction circuit is used, a plurality of different types of correction means may be used.

(Example 3) The recording layer composition was adjusted to CAV at the inner and outer circumferences.
A case where the multi-pulse waveform is changed for each zone of the disk optimized for the mode will be described.

The method of making the disc is the same as in the first embodiment.
You. The composition of the recording layer was Ge in the outer zone. 22.2Sb22.2Te
55.6; (2GeTe + SbTwoTeThree), Ge in inner zone
21.1Sb26.3Te52.6; (2GeTe + SbTwoTeThree+
0.5Sb), and the thickness and composition of other layers
Same as Example 1.

The relationship between the radius and the jitter in each multi-pulse waveform recording is shown in (Table 3).

[0047]

[Table 3]

From Table 3, when the recording waveform D is used, good jitter can be obtained because the laser power is suitable in the inner peripheral portion. On the other hand, in the outer peripheral portion, the laser power is insufficient in the short pulse train following the recording waveform D, so that a distortion occurs in which the rear portion is narrower than the front portion of the mark, so that the jitter value is slightly inferior to the inner peripheral portion.

When the recording waveform E is used, since the heat retention at the inner peripheral portion is larger than that of the recording waveform D, the mark is distorted and the jitter is worse than that of the recording waveform D. On the other hand, in the outer peripheral portion, the shortage of the laser power is improved as compared with the case of the recording waveform D, a recording mark symmetrical in the longitudinal direction is formed, and the jitter value is further reduced.

On the other hand, when the recording waveform D is used on the inner circumference and the recording waveform E is used on the outer circumference according to the present invention, a good recording mark is formed because the recording waveform is optimal in each zone as described above. The resulting jitter value is reduced.

As described above, by correcting the recording waveform for each zone, it is possible to perform recording with small jitter on the entire surface of the disk.

In this embodiment, 2 is used as the waveform correcting means.
Although one waveform correction circuit is used, a plurality of different types of correction means may be used.

In this embodiment, xGeTe + (1-
x) x = 2 / in Sb 2 Te 3 + ySb (y ≧ 0)
Although only the case of No. 3 is shown, for a recording layer composition satisfying x = 1 /, even in a disk in which the crystallization speed is higher in the outer peripheral zone, the multi-pulse waveform is changed to obtain a better multi-pulse than in the case of the same inner and outer circumferences. A jitter value was obtained.

Example 4 The recording layer was made of xGeTe + (1-
x) The case where the multi-pulse is changed for each zone of the disk satisfying Sb 2 Te 3 + yAg (x = 2, y ≧ 0) and optimizing the value of y for the CAV mode in the inner and outer peripheral zones of the disk explain.

The method of making the disc is the same as in the first embodiment.
You. The recording layer composition was Ge in the outer zone. 22.2Sb22.2Te
55.6; (2GeTe + SbTwoTeThree), Ge in inner zone
21.1Sb21.1Te52.6Ag5.2; (2GeTe + SbTwoT
eThree+0.5 Ag), and the thickness and composition of other layers
Is the same as in the first embodiment.

Table 4 shows the relationship between the radius and the jitter in recording with each multi-pulse waveform.

[0057]

[Table 4]

As shown in Table 4, when the recording waveform D was used, good jitter was obtained even in the outer peripheral portion. However, when the recording waveform E is used, the recording waveform D
In this case, the shortage of the laser power is improved as compared with the case (1), a recording mark which is symmetrical in the longitudinal direction is formed, and the jitter value is further reduced. On the other hand, in the inner peripheral part, the mark is distorted and the jitter is slightly worse because the heat retention is larger than that in the case of the recording waveform D.

In the case where the recording waveform D is used on the inner circumference and the recording waveform E is used on the outer circumference according to the present invention, since the recording waveform is optimized in each zone as described above, a good recording mark can be formed and jitter can be reduced. The value decreases.

As described above, by correcting the recording waveform for each zone, it is possible to perform recording with small jitter on the entire surface of the disk.

In addition, Cu, Co, Tl, P other than Ag
When d, Au, Bi, Se, Sn, Pt, and Ni were added to the recording layer in a larger amount in the outer peripheral zone, the same results as in the present example were obtained.

(Embodiment 5) A case in which the multi-pulse waveform is changed in each zone of the disk in which the reflection film thickness in the inner and outer peripheral zones is optimized for the CAV mode will be described.

The method of manufacturing the disk is as described in the first embodiment. FIG. 7 shows the structure of the disk used in this embodiment. The thickness of the reflective layer at the inner periphery was 2000 °, and the thickness of the reflective layer at the outer periphery was 1250 °. The recording layer composition was Ge 21.6 Sb 24.3
Te 54.1 ; (2GeTe + Sb 2 Te 3 + 0.25Sb)
The film thickness and the film configuration of the other layers were the same as in Example 1.

Table 5 shows the relationship between the radius and the jitter in recording with each multi-pulse waveform.

[0065]

[Table 5]

From Table 5, when the recording waveform D is used, good jitter is obtained in the inner peripheral portion. On the other hand, in the outer peripheral portion, the laser power was insufficient in the short pulse train following the recording waveform D, so that the rear portion was narrower than the front portion of the mark, so that the jitter value was slightly inferior to the inner peripheral portion.

In the case of using the recording waveform E, the mark is distorted and the jitter is slightly deteriorated because the heat retention at the inner peripheral portion is larger than that in the case of the recording waveform D. On the other hand, in the outer peripheral portion, the shortage of the laser power was improved as compared with the case of the recording waveform D, a recording mark symmetrical in the longitudinal direction was formed, and the jitter value was further reduced.

On the other hand, when the recording waveform D is used for the inner circumference and the recording waveform E is used for the outer circumference according to the present invention, a good recording mark is formed because the recording waveform is optimal in each zone as described above. The resulting jitter value is reduced.

As described above, by correcting the recording waveform for each zone, it is possible to perform recording with small jitter on the entire surface of the disk.

(Embodiment 6) A case where the multi-pulse waveform is changed for each zone of a disk in which the second dielectric layer thickness in the inner and outer peripheral zones is optimized for the CAV mode will be described.

The method of manufacturing the disk is as described in the first embodiment. FIG. 8 shows the structure of the disk used in this embodiment. The thickness of the second dielectric layer at the inner periphery was 170 °, and the thickness of the second dielectric layer at the outer periphery was 230 °. The recording layer composition is Ge
21.6 Sb 24.3 Te 54.1 ; (2GeTe + Sb 2 Te 3 +
0.25 Sb), and the film thickness and the film configuration of the other layers were the same as in Example 1.

Table 6 shows the relationship between the radius and the jitter in recording with each multi-pulse waveform.

[0073]

[Table 6]

From Table 6, when the recording waveform D is used, good jitter is obtained in the inner peripheral portion. On the other hand, in the outer peripheral portion, the laser power was insufficient in the short pulse train following the recording waveform D, so that the rear portion was narrower than the front portion of the mark, so that the jitter value was slightly inferior to the inner peripheral portion.

When the recording waveform E is used, the mark is slightly distorted and the jitter is slightly worse because the heat retention at the inner peripheral portion is larger than that in the case of the recording waveform D. On the other hand, in the outer peripheral portion, the shortage of the laser power was improved as compared with the case of the recording waveform D, a recording mark symmetrical in the longitudinal direction was formed, and the jitter value was further reduced.

On the other hand, when the recording waveform D is used for the inner circumference and the recording waveform E is used for the outer circumference according to the present invention, a good recording mark is formed because the recording waveform is optimal in each zone as described above. The resulting jitter value is reduced.

As described above, by correcting the recording waveform for each zone, it is possible to perform recording with small jitter on the entire surface of the disk.

(Embodiment 7) A case where the multi-pulse waveform is changed in each zone of a disk in which the recording film thickness in the inner and outer peripheral zones is optimized for the CAV mode will be described.

The manufacturing method of the disk is as described in the first embodiment.
It is a cage. FIG. 10 shows the structure of the disk used in this embodiment.
Shown in The recording film thickness at the inner circumference is 200mm, and the reflective layer at the outer circumference
The thickness was 300 °. The recording layer composition is Ge21.6Sb24.3T
e54.1; (2GeTe + Sb TwoTeThree+ 0.25Sb) and
However, the film thickness and the film configuration of the other layers are the same as in the first embodiment.
did.

Table 7 shows the relationship between the radius and the jitter in the recording with each multi-pulse waveform.

[0081]

[Table 7]

From Table 7, when the recording waveform D is used, good jitter is obtained in the inner peripheral portion. On the other hand, in the outer peripheral portion, the laser power was insufficient in the short pulse train following the recording waveform D, so that the rear portion was narrower than the front portion of the mark, so that the jitter value was slightly inferior to the inner peripheral portion.

In the case of using the recording waveform E, the mark is slightly distorted and the jitter is slightly deteriorated because the heat retention at the inner peripheral portion is larger than that in the case of the recording waveform D. On the other hand, in the outer peripheral portion, the shortage of the laser power was improved as compared with the case of the recording waveform D, a recording mark symmetrical in the longitudinal direction was formed, and the jitter value was further reduced.

On the other hand, when the recording waveform D is used for the inner circumference and the recording waveform E is used for the outer circumference according to the present invention, a good recording mark is formed because the recording waveform is optimal in each zone as described above. The resulting jitter value is reduced.

As described above, by correcting the recording waveform for each zone, it is possible to perform recording with small jitter on the entire surface of the disk.

(Embodiment 8) A case will be described in which only the last pulse width of the succeeding pulse train is changed for each zone of the disk in which the thickness of the reflective layer is optimized for the CAV mode on the inner and outer circumferences.

The same disk as in Example 1 was used.
The recording waveforms used in this embodiment are the recording waveform D and the recording waveform E in FIG.

Table 8 shows the relationship between the radius and the jitter for each recording waveform.

[0089]

[Table 8]

From Table 8, when the recording waveform D is used, good jitter is obtained in the inner peripheral portion. On the other hand, in the outer peripheral portion, the laser power was insufficient in the short pulse train following the recording waveform D, so that the rear portion was narrower than the front portion of the mark, so that the jitter value was slightly inferior to the inner peripheral portion.

When the recording waveform F is used, the mark is slightly distorted and the jitter is slightly deteriorated because the heat retention at the inner peripheral portion is larger than that in the case of the recording waveform D. On the other hand, in the outer peripheral portion, the shortage of the laser power was improved as compared with the case of the recording waveform D, a recording mark symmetrical in the longitudinal direction was formed, and the jitter value was further reduced.

On the other hand, when the recording waveform D is used for the inner circumference and the recording waveform F is used for the outer circumference according to the present invention, a good recording mark is formed because the recording waveform is optimal in each zone as described above. The resulting jitter value is reduced.

As described above, by correcting the recording waveform for each zone, it is possible to perform recording with small jitter on the entire surface of the disk.

In this embodiment, 2 is used as the waveform correcting means.
Although one waveform correction circuit is used, a plurality of different types of correction means may be used.

[0095]

As described above, the mark distortion can also be suppressed by changing the multi-pulse recording waveform for each zone, and good reproduction jitter characteristics can be obtained.

[Brief description of the drawings]

1A is a diagram of a digital signal waveform to be recorded. FIG. 1B is a diagram of a single-pulse recording waveform B. FIG. 1C is a diagram of a single-pulse recording waveform C. FIG. ) Is a diagram of the multi-pulse recording waveform E. (f) is a diagram of the multi-pulse recording waveform F.

FIG. 2 is a structural diagram of a representative optical disk of the present invention.

FIG. 3 is a diagram of an optical disk manufacturing apparatus according to the present invention.

FIG. 4 is a diagram of an optical disk manufacturing apparatus according to the present invention.

FIG. 5 is an explanatory diagram of a recording apparatus according to the present invention.

FIG. 6 is a structural diagram of an optical disc in the first embodiment of the present invention.

FIG. 7 is a structural diagram of an optical disc in a third embodiment of the present invention.

FIG. 8 is a structural diagram of an optical disc in a fourth embodiment of the present invention.

FIG. 9 is a structural diagram of an optical disc in a fifth embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 21 substrate 22 first dielectric layer 23 recording layer 24 second dielectric layer 25 reflective layer 26 protective layer 27 inner peripheral zone 28 outer peripheral zone 31 inner peripheral sputtering mask 32 target 1 41 outer peripheral sputtering mask 42 target 2 51 optical disk 52 spindle motor 53 optical head 54 laser drive circuit 55 waveform correction circuit A 56 waveform correction circuit B 57 address reproduction circuit 58 system controller 59 switch 60 tracking control circuit 61 recording layer 2 71 recording layer 3

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-6-325364 (JP, A) JP-A-5-274678 (JP, A) JP-A-6-12674 (JP, A) JP-A-4- 119537 (JP, A) JP-A-3-52137 (JP, A) JP-A-62-283432 (JP, A) JP-A-3-183038 (JP, A) JP-A-62-1143 (JP, A) JP-A-6-187669 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) G11B 7/ 00-7/013 G11B 7/24

Claims (12)

    (57) [Claims]
  1. An amorphous phase and a crystalline phase are irradiated by light irradiation.
    Phase-change recording layer that causes a reversible phase change between
    Layer and a reflective layer are laminated on the substrate at least in this order
    And the input signal waveform of the information to be recorded
    Waveform correction means for correcting with a predetermined waveform correction method
    And a recording waveform signal output from the waveform correcting means.
    Laser driving means for emitting laser light,
    Responds to the laser drive signal output from the laser drive means.
    Laser spot on the optical disk
    The optical disk by using a laser light irradiation means.
    The laser beam is irradiated while rotating at an angular velocity to
    Forming a recording mark on a disk in accordance with a recording waveform signal
    A method for recording optical information, comprising:
    At least one of a phase change recording layer, a dielectric layer, and a reflective layer
    One of the layer configurations is such that the center of the optical disc is a concentric circle.
    Different for each of a plurality of zones, and
    A method of recording optical information , wherein a waveform correction method of the waveform correction means is changed.
  2. 2. A zone located on an inner peripheral side of the optical disk.
    The crystallization speed of the phase change recording layer decreases as
    The method for recording optical information according to claim 1.
  3. 3. A zone located on an inner peripheral side of the optical disk.
    Go as a recording method of an optical information <br/> claim 1, wherein the layer thickness of the phase change recording material is thin to.
  4. 4. A zone located on an inner peripheral side of the optical disk.
    The thickness of the dielectric layer becomes thinner toward
    A method for recording optical information according to item 1 .
  5. 5. A zone located on an inner peripheral side of the optical disk.
    Claims thickness of the reflecting layer toward the is thicker 1
    Method for recording the described optical information.
  6. 6. The recording waveform for forming one recording mark.
    It is composed of a recording pulse train signal comprised of a plurality of pulses
    And the shape of the recording pulse train is different for each zone.
    The method for recording optical information according to any one of claims 1 to 5, wherein:
  7. Wherein said recording pulse train beginning of the consists of a long pulse and a subsequent short pulse train, the long pulse or said zone of either or both of the pulse width of the short pulse
    7. The optical information recording method according to claim 6 , wherein the optical information is changed for each of the optical systems.
  8. 8. A zone located on the outer peripheral side of the optical disk
    Go higher, it said with the long pulse pulse width of the short pulse
    Claim to increase the ratio of (short pulse width / long pulse width) 7
    Method for recording the described optical information.
  9. 9. A pulse located at the last end of the short pulse train.
    The optical information according to claim 6, wherein the width of the optical information is different for each zone.
    How to record information.
  10. 10. The laser spot and the optical disk
    The length of the pulse train is changed depending on the relative speed of the pulse train.
    10. The method for recording optical information according to any one of items 6 to 9.
  11. 11. The method according to claim 1, wherein the number of the zones is two.
    0. A method for recording optical information according to any one of the above items.
  12. 12. An optical disk according to claim 1, an optical system for irradiating the optical disk with a light beam generated by a laser light source, means for rotating the optical disk at a constant angular velocity, and Irradiating the optical beam with the optical disk
    And transport means for moving the recording track direction perpendicular to the direction provided in the light and tracking control means for the light beam irradiated on the disk for controlling the transfer means so as to scan over the recording track, on the optical disc Means for detecting in which zone of the optical disc the current recording track being scanned by the light beam applied to the optical disc; and an input signal of a recording pulse train comprising a plurality of pulses for forming a recording mark on the optical disc A plurality of waveform correction means for correcting the waveform of the pulse waveform; a means for switching the waveform correction means in accordance with the detected zone of the recording pulse train; and a laser beam output from the pulse train output from the waveform correction means. Means for recording a signal by modulating the signal.
JP31659494A 1994-12-20 1994-12-20 Method and apparatus for recording optical information on optical disc Expired - Fee Related JP3277733B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP31659494A JP3277733B2 (en) 1994-12-20 1994-12-20 Method and apparatus for recording optical information on optical disc

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP31659494A JP3277733B2 (en) 1994-12-20 1994-12-20 Method and apparatus for recording optical information on optical disc

Publications (2)

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JPH08180413A JPH08180413A (en) 1996-07-12
JP3277733B2 true JP3277733B2 (en) 2002-04-22

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5978322A (en) * 1996-07-30 1999-11-02 Kabushiki Kaisha Toshiba Optical recording medium having a parameter for identifying the format of data and a reproducing device thereof
US7158461B1 (en) 1997-12-30 2007-01-02 Samsung Electronics Co., Ltd. Adaptive writing method for high-density optical recording apparatus and circuit thereof
US7391698B2 (en) 1998-07-23 2008-06-24 Samsung Electronics Co., Ltd. Adaptive writing method for high-density optical recording apparatus and circuit thereof
JP3521141B2 (en) 2002-01-08 2004-04-19 株式会社リコー Information recording device
US7492682B2 (en) 2002-07-25 2009-02-17 Yamaha Corporation Optical disk recording apparatus controllable by table of multi-pulse patterns
JP4276516B2 (en) 2003-10-20 2009-06-10 パイオニア株式会社 Multilayer optical recording medium and optical pickup device

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