JP2689856B2 - Optical recording medium - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording medium for recording / reproducing information with a laser beam and a recording / reproducing method thereof, and more particularly to an additional recordable (including rewritable) optical recording having information tracks of different heights. Regarding the medium.

[0002]

2. Description of the Related Art An optical disk or the like in which information is recorded or reproduced by a laser beam has an excellent feature as a large-capacity storage system because of its high recording density.

In such an optical disk or the like, tracks of about 1 μm are spirally or concentrically provided on an optical recording medium in order to record information at a high density, and recording or reproduction is performed by a narrowly narrowed laser beam. At this time, track servo is performed so that the laser beam does not deviate from a desired track and go to another track. Further, in order to record or reproduce information at a high speed, an uneven preformat for address identification is formed on each track for each unit information section (for example, Japanese Patent Laid-Open Nos. 1-165052 and 4-1998). 172623).

FIG. 16 shows a conventional ISO (International Or
(a) is a plan view and (b) is a cross-sectional view of the optical disc as a 130 mm magneto-optical recording medium conforming to the ganization for Standardization).

In the figure, the land portion 1601 of the information track 1600 is divided by a V-shaped groove portion 1602, and the land portion 1601 is formed with a pit portion 1603 which is an unevenness for address identification for each unit information section. .

FIG. 17 is a partially enlarged explanatory view of another conventional optical recording medium, (a) is a plan view and (b) is a sectional view. In the figure, the land portion 1701 of the information track 1700 is divided by a U-shaped groove portion 1702, and the land portion 1701 is formed with a bent portion 1703 of the wall surface as unevenness for address identification for each unit information section. Such irregularities are formed on a transparent substrate, and a recording film is formed on this transparent substrate.

Generally, the recording film of an optical recording medium such as a recordable optical disk is of a magneto-optical type utilizing the Kerr effect, or of a phase change type utilizing the difference in reflectance between crystalline and amorphous. Is used.

The laser light for recording and reproducing enters through the transparent substrate and is focused by the focus servo so as to have a diameter of about 1.4 μm near the recording film. As a laser light source, a semiconductor laser having a wavelength of about 6700 to 8300 angstroms is used.

In recording information, the recording film is irradiated with a high-power laser beam so that the recording film absorbs the energy of the laser beam and the laser beam is converted into heat energy to raise the temperature of the recording film. In the magneto-optical type, information is recorded by applying a recording bias magnetic field to a region including this portion so that the magnetization of this portion is oriented in a direction opposite to that of the other portions. The phase change type is
Information recording is performed by rapidly cooling the heated portion by stopping the laser beam irradiation, thereby changing this portion from crystalline to amorphous.

To read information, a low power laser beam is applied along the information track to detect a difference in the amount of reflected light due to a difference in the state of the recording film as a signal. The magneto-optical type utilizes the fact that when a linearly polarized laser beam is irradiated on a recording film, the polarization direction of reflected light from the recording film rotates according to the magnetization direction of the recording film. The phase change type utilizes the fact that the reflectance in a crystalline state is different from the reflectance in an amorphous state.

Since such a magneto-optical film and a phase change film are easily oxidized, they are usually sandwiched between dielectric films.

Next, a recording / reproducing method for such an optical recording medium will be described.

When information is recorded or reproduced, the information track is irradiated with a laser beam of low power, and an unevenness for address identification is formed in the land portion of the information track for each unit information section. Then, the address is recognized and the above-mentioned recording / reproduction is performed.

[0014]

However, in the conventional optical recording medium, since each land has a groove portion for dividing a land portion where information is recorded, the recording density is reduced accordingly. On the other hand, as a method for recording and reproducing at high density, a method has also been proposed in which adjacent information tracks are alternately provided by changing their heights (for example, JP-A-2-58732).
No.). In this case, since there is no groove portion in which information is not recorded, high density recording / reproducing is possible. However, since the tracks are not addressed,
It takes a long time to find the track position.

That is, there is a problem in that there is no conventional optical recording medium that can record information at a high density and can record and reproduce information at a high speed.

The present invention has been made in view of the above problems, and an object thereof is to provide an optical recording medium capable of recording and reproducing information at high density and at high speed.

[0017]

In the optical recording medium of the first invention, tracks for recording information are alternately provided on the surface of the transparent substrate with different heights, and each high and low track has a unit. It is a recordable optical recording medium in which a preformat of unevenness for address identification is formed for each information section, and unevenness for address identification is formed in the form of pits for each unit information section on the high-altitude track. Then, the low-rise track is pre-formatted by forming unevenness for address identification in the form of a high place for each unit information section.

In the optical recording medium of the first invention, at least the first dielectric film, the magneto-optical film, and the second dielectric film are laminated on the transparent substrate. Further, the first dielectric film, the phase change film, and the second dielectric film may be laminated at least.

In the optical recording medium of the second invention, tracks for recording information are alternately provided on the surface of the transparent substrate with different heights, and the high and low tracks are used for address identification for each unit information section. Is a recordable optical recording medium having a concavo-convex pre-format formed thereon, wherein concavities and convexities for address identification are formed in the high-altitude tracks in the form of low parts instead of pits for each unit information section, Pre-formatting is performed by forming concavities and convexities for address identification in the form of high places in each unit information section on the low place tracks.

In the optical recording medium of the third invention, tracks for recording information are alternately provided on the surface of the transparent substrate with different heights, and the high and low tracks are used for address identification for each unit information section. Is a recordable optical recording medium in which a concavo-convex pre-format is formed, and the concavities and convexities for address identification are formed in the high-altitude tracks in such a manner that the track width is narrowed for each unit information section. Pre-formatting is performed by forming concavities and convexities for address identification in the form of high places in each unit information section on the specific track.

[0021]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a partially enlarged view of the preformat of the optical recording medium of the present invention. (A) is a plan view and (b) is AA.
It is sectional drawing.

In the figure, on the surface of the transparent substrate 11, there are high-altitude tracks (L) as tracks for recording information.
(N) etc. and low-place tracks (G (n) etc.) are provided alternately. The pit part 12 is formed in the high-altitude track so that the pit part 12 bears the address, and the low-altitude track has the high-altitude part 1.
It is made to bear the address by forming 3. Each address is formed for each predetermined unit information section. The distinction between the high-altitude track and the low-altitude track can be judged by the polarity of the push-pull signal when the laser light crosses the wall surface of the track boundary. Therefore, when the address of the high place track is detected, the electric circuit is switched to the electric circuit which detects the pit portion 12, and when the address of the low place track is detected, the electric circuit which detects the high place part 13 is switched.
The address of each track can be identified.

The above-mentioned roles of the high-altitude track and the low-altitude track may be reversed depending on the method of manufacturing the stamper for forming the preformat, but here, the light of the master exposure machine for manufacturing the stamper is used. A case will be described in which a place irradiated with a beam becomes a low-lying track. The low-side track is produced by irradiating the first light beam of the master exposure device. By partially interrupting the irradiation of the first light beam, the high part 13 of the low track is
Is prepared. The pit portion 12 of the high-altitude track is produced by irradiating this portion with the second light beam.

FIG. 2 is a schematic sectional view showing the basic structure of the film structure of an embodiment of the optical recording medium of the present invention.

In the optical recording medium shown in FIG. 2, a first dielectric film 21 is provided on the transparent substrate 11 shown in FIG. 1, a magneto-optical film 22 is provided thereon, and a second dielectric film 22 is provided thereon. The body membrane 23 is provided in order.

FIG. 3 is a schematic sectional view showing the basic structure of the film structure of the second embodiment of the optical recording medium of the present invention.

In the optical recording medium shown in FIG. 3, a first dielectric film 31 is provided on the transparent substrate 11 shown in FIG. 1, a magneto-optical film 32 is provided thereon, and a second dielectric film is provided thereon. The body film 33 is provided, and the metal film 34 is sequentially provided on the body film 33.

FIG. 4 is a schematic sectional view showing the basic structure of the film structure of the third embodiment of the optical recording medium of the present invention.

In the optical recording medium shown in FIG. 4, a first dielectric film 41 is provided on the transparent substrate 11 shown in FIG. 1, a phase change film 42 is provided thereon, and a second dielectric film is provided thereon. The body membrane 43 is provided in order.

FIG. 5 is a schematic sectional view showing the basic constitution of the film constitution of the fourth embodiment of the optical recording medium of the present invention.

In the optical recording medium shown in FIG. 5, a first dielectric film 51 is provided on the transparent substrate 11 shown in FIG. 1, a phase change film 52 is provided thereon, and a second dielectric film 52 is provided thereon. The body film 53 is provided, and the metal film 54 is sequentially provided on the body film 53.

While these optical recording media have the configurations as shown in FIGS. 2 to 5, information may be recorded and reproduced by injecting laser light through the transparent substrate 11.
In addition, a protective film such as a UV curable resin may be provided on it. Further, by coating a hot-melting agent on a protective film such as a UV curable resin, the two optical recording media are attached to each other so that the transparent substrate is on the outer side or a dummy substrate is placed so that the transparent substrate is on the outer side. It may be pasted together.

Furthermore, when an antireflection film such as SiO2, a surface-hardened film of a transparent organic resin having a high hardness, or a transparent film having a high conductivity is provided on the transparent substrate 11 on the side opposite to the recording film. There is also.

FIG. 6 is a partially enlarged view of a preformat of another optical recording medium of the present invention, (a) is a plan view and (b) is B.
It is -B sectional drawing.

In the figure, on the surface of the transparent substrate 61, there are high-level tracks (L) as tracks for recording information.
(N) or the like) and low-place tracks (G (n) or the like) are alternately provided, and the low-rise portion 62 is formed in the high-rise truck so that the low-rise truck can carry the address. By forming 63, the address is assigned. When detecting the address of the high place track, the circuit is switched to the electric circuit for detecting the low part 62, and when detecting the address of the low place track, the circuit is switched to the electric circuit for detecting the high part 63. You can identify the address. The above-described roles of the high-altitude track and the low-altitude track may be reversed depending on the method of manufacturing the stamper for forming the preformat, but here, the light beam of the master exposure device for manufacturing the stamper is used. A case will be described in which a low-light truck is irradiated with a beam. The low-side track is produced by irradiating the first light beam of the master exposure device. By partially interrupting the irradiation of the first light beam, the high part 63 of the low track is produced. The low portion 62 of the high-altitude track is produced by irradiating this portion with the second light beam.

FIG. 7 is a schematic sectional view showing the basic constitution of the film constitution of the fifth embodiment of the optical recording medium of the present invention.

In the optical recording medium shown in FIG. 7, a first dielectric film 71 is provided on the transparent substrate 61 shown in FIG. 6, a magneto-optical film 72 is provided thereon, and a second dielectric film 72 is provided thereon. The body membrane 73 is provided in order.

FIG. 8 is a schematic sectional view showing the basic constitution of the film constitution of the sixth embodiment of the optical recording medium of the present invention.

In the optical recording medium shown in FIG. 8, a first dielectric film 81 is provided on the transparent substrate 61 shown in FIG. 6, a magneto-optical film 82 is provided thereon, and a second dielectric film is provided thereon. The body film 83 is provided, and the metal film 84 is sequentially provided on the body film 83.

FIG. 9 is a schematic sectional view showing the basic constitution of the film constitution of the seventh embodiment of the optical recording medium of the present invention.

In the optical recording medium shown in FIG. 9, a first dielectric film 91 is provided on the transparent substrate 61 shown in FIG. 6, a phase change film 92 is provided thereon, and a second dielectric film is provided thereon. The body film 93 is provided in order.

FIG. 10 is a schematic sectional view showing the basic constitution of the film constitution of the eighth embodiment of the optical recording medium of the present invention.

In the optical recording medium shown in FIG. 10, the first dielectric film 101 is provided on the transparent substrate 61 shown in FIG. 6, the phase change film 102 is provided thereon, and the second dielectric film is provided thereon. Body membrane 1
03 is provided, and the metal film 104 is sequentially provided thereon.

Information may be recorded and reproduced by injecting a laser beam through the transparent substrate 61 with these optical recording media having the configurations as shown in FIGS. 7 to 10, and further UV curing is performed on the information recording and reproduction. A protective film such as resin may be provided. Further, by coating a hot-melting agent on a protective film such as a UV curable resin, the two optical recording media are attached to each other so that the transparent substrate is on the outer side or a dummy substrate is placed so that the transparent substrate is on the outer side. It may be pasted together.

Furthermore, when an antireflection film such as SiO2, a surface-hardened film of a transparent organic resin having a high hardness, or a transparent film having a high conductivity is provided on the transparent substrate 61 on the side opposite to the recording film. There is also.

FIG. 11 is a partially enlarged view of the preformat of another optical recording medium of the present invention, (a) is a plan view and (b) is a sectional view taken along line CC.

In the figure, on the surface of the transparent substrate 111, a high-altitude track (L) is formed as a track for recording information.
(N) or the like) and low-place tracks (G (n) or the like) are alternately provided, and the narrow track 112 is formed in the high-track so that the address can be carried. The address 113 is formed by forming 113. When detecting an address of a high place track, switch to an electric circuit (for example, an amplitude detecting circuit) that detects the narrow track portion 112, and when detecting an address of a low place track, switch to an electric circuit that detects the high place part 113. Can identify the address of each track. The above-described roles of the high-altitude track and the low-altitude track may be reversed depending on the method of manufacturing the stamper for forming the preformat, but here, the light beam of the master exposure device for manufacturing the stamper is used. A case will be described in which a low-light truck is irradiated with a beam. Low-place truck is the first master exposure machine
It is manufactured by irradiating the light beam of. By partially interrupting the irradiation of the first light beam, the high part 113 of the low track is manufactured. The narrow track portion 112 of the high-altitude track is produced by displacing the second light beam from the center of this portion toward the low-altitude track side and irradiating it.

FIG. 12 is a schematic sectional view showing the basic constitution of the film constitution of the ninth embodiment of the optical recording medium of the present invention.

The optical recording medium shown in FIG. 12 has the first dielectric film 121 provided on the transparent substrate 111 shown in FIG.
A magneto-optical film 122 is provided on top of this, and a second dielectric film 123 is provided on it in that order.

FIG. 13 is a schematic sectional view showing the basic constitution of the film constitution of the tenth embodiment of the optical recording medium of the present invention.

The optical recording medium shown in FIG. 13 has the first dielectric film 131 provided on the transparent substrate 111 shown in FIG.
The magneto-optical film 132 is provided thereon, the second dielectric film 133 is provided thereon, and the metal film 134 is provided thereon in this order.

FIG. 14 is a schematic sectional view showing the basic constitution of the film constitution of the eleventh embodiment of the optical recording medium of the present invention.

The optical recording medium shown in FIG. 14 has the first dielectric film 141 provided on the transparent substrate 111 shown in FIG.
A phase change film 142 is provided thereon, and a second dielectric film 143 is sequentially provided thereon.

FIG. 15 is a schematic sectional view showing the basic constitution of the film constitution of the twelfth embodiment of the optical recording medium of the present invention.

The optical recording medium shown in FIG. 15 has a first dielectric film 151 provided on the transparent substrate 111 shown in FIG.
A phase change film 152 is provided thereon, a second dielectric film 153 is provided thereon, and a metal film 154 is sequentially provided thereon.

Information may be recorded and reproduced by injecting a laser beam through the transparent substrate 111 with these optical recording media having the configurations as shown in FIGS. 12 to 15, and further UV curing may be performed thereon. A protective film such as resin may be provided. Further, by coating a hot-melting agent on a protective film such as a UV curable resin, the two optical recording media are attached to each other so that the transparent substrate is on the outer side or a dummy substrate is placed so that the transparent substrate is on the outer side. It may be pasted together.

Furthermore, when an antireflection film such as SiO2, a surface-hardened film of a transparent organic resin having a high hardness, or a transparent film having a high conductivity is provided on the transparent substrate 111 on the side opposite to the recording film. There is also.

As the transparent substrates 11, 61 and 111, a polycarbonate resin plate, a polyolefin resin plate, an acrylic resin plate, a glass plate, an acrylic resin plate with a photopolymer, or a glass plate with a photopolymer is used. To use. The preformat mentioned above is formed on the plate itself or on the surface of the photopolymer. The pitch of the information tracks is approximately 0.5 to 1.4 μm.
First dielectric film 21, 31, 71, 8 in contact with the magneto-optical film
The material of 1,121,131 is silicon nitride,
It is particularly desirable to use silicon oxynitride, aluminum nitride, aluminum oxynitride, hydrogenated silicon carbide, or tantalum oxide as a main component.

First dielectric films 41, 5 in contact with the phase change film
The material of 1,91,101,141,151 is a mixture of zinc sulfide and silicon dioxide, silicon nitride, silicon oxynitride, aluminum nitride, aluminum oxynitride, hydrogenated silicon carbide, tantalum oxide. It is particularly preferable that the main component is.

Magneto-optical films 22, 32, 72, 82, 12
The material of 2,132 is TbFe or TbFeCo.
, TbFeTi, TbFeCoTi, TbFeC
r, TbFeCoCr, TbFeTa, TbFe
CoTa, TbFeNiCr, TbFeCoNiC
r, TbGdFe, TbGdFeCo, TbGd
FeTi, TbGdFeCoTi, TbGdFeC
r, TbGdFeCoCr, TbGdFeTa,
TbGdFeCoTa, TbGdFeNiCr, T
bGdFeCoNiCr, TbDyFe, TbDy
FeCo, TbDyFeTi, TbDyFeCoT
i, TbDyFeCr, TbDyFeCoCr,
TbDyFeTa, TbDyFeCoTa, TbD
yFeNiCr, TbDyFeCoNiCr, Tb
GdNdFe, TbGdNdFeCo, TbGdN
dFeTi, TbGdNdFeCoTi, TbGd
NdFeCr, TbGdNdFeCoCr, TbG
dNdFeTa, TbGdNdFeCoTa, Tb
GdNdFeNiCr and TbGdNdFeCoNiC
r, TbGdDyFe, TbGdDyFeCo,
TbGdDyFeTi and TbGdDyFeCoTi
, TbGdDyFeCr, TbGdDyFeCoC
r, TbGdDyFeTa, TbGdDyFeCo
Ta, TbGdDyFeNiCr, TbGdDyF
eCoNiCr is particularly desirable. Further, a plurality of other layers may be stacked on these layers. In addition, GdFe and GdF
eCo, GdFeTi, GdFeCoTi, Gd
FeCr, GdFeCoCr, GdFeTa, G
dFeCoTa, GdFeNiCr, GdFeCo
NiCr, GdNdFe, GdNdFeCo, G
dNdFeTi, GdNdFeCoTi, GdNd
FeCr, GdNdFeCoCr, GdNdFeT
a, GdNdFeCoTa, GdNdFeNiCr
Alternatively, a read layer such as GdNdFeCoNiCr may be stacked.

Phase change films 42, 52, 92, 102, 14
As the material of 2,152, a compound of a chalcogen element is desirable, but GeSbTe is particularly desirable. Phase change film 4
A small amount of element such as nitrogen may be added to 2,52. Second
As the material of the dielectric films 23, 33, 73, 83, 123, and 133, silicon nitride, silicon oxynitride,
It is particularly desirable to use aluminum nitride, aluminum oxynitride, hydrogenated silicon carbide, or tantalum oxide as a main component.

Second dielectric film 43, 53, 93, 10
As a material of 3,143,153, a mixture of zinc sulfide and silicon dioxide, silicon nitride, silicon oxynitride, aluminum nitride, aluminum oxynitride, hydrogenated silicon carbide, or tantalum oxide is a main component. Is particularly desirable.

Metal films 34, 54, 84, 104, 13
An aluminum alloy is desirable as the material of 4,154. The additive elements include Ti, Cr, Ta, and Ni.
Alternatively, NiCr is particularly desirable.

The laser light for recording and reproducing enters through the transparent substrate 1 and is about φ1.0 to φ in the vicinity of the recording film.
The light is focused by a focusing servo so as to have a thickness of 1.4 μm. And the wavelength of the laser light source is 6500
A semiconductor laser of about 8300 Å or so is used.

[0066]

In the optical recording medium of the present invention, high-place tracks and low-place tracks are alternately arranged, and information can be written in any of the tracks, so that information can be recorded at a high density and an address can be recorded in each track. Since it is written, there is an effect that it can be recorded and reproduced at high speed.

[Brief description of the drawings]

FIG. 1 is a partially enlarged view of a preformat of an optical recording medium of the present invention, (a) is a plan view and (b) is a sectional view taken along line AA.

FIG. 2 is a plan view showing the basic structure of an optical recording medium of one embodiment of the present invention.

FIG. 3 is a plan view showing the basic structure of an optical recording medium of Example 2 of the present invention.

FIG. 4 is a plan view showing the basic structure of an optical recording medium of Example 3 of the present invention.

FIG. 5 is a plan view showing the basic structure of an optical recording medium of Example 4 of the present invention.

FIG. 6 is a partially enlarged view of a preformat of another optical recording medium of the present invention, (a) is a plan view, and (b) is a BB sectional view.

FIG. 7 is a plan view showing the basic structure of an optical recording medium of Example 5 of the present invention.

FIG. 8 is a plan view showing the basic structure of an optical recording medium of Example 6 of the present invention.

FIG. 9 is a plan view showing the basic structure of an optical recording medium of Example 7 of the present invention.

FIG. 10 is a plan view showing the basic structure of an optical recording medium of Example 8 of the present invention.

FIG. 11 is a partially enlarged view of a preformat of another optical recording medium of the present invention, (a) is a plan view and (b) is a C-C sectional view.

FIG. 12 is a plan view showing the basic structure of an optical recording medium of Example 9 of the present invention.

FIG. 13 is a plan view showing the basic structure of the optical recording medium of the tenth embodiment of the present invention.

FIG. 14 is a plan view showing the basic structure of an optical recording medium of Example 11 of the present invention.

FIG. 15 is a plan view showing the basic structure of an optical recording medium of Example 12 of the present invention.

FIG. 16 is a partially enlarged view of a preformat of a conventional optical recording medium, (a) is a plan view and (b) is a sectional view.

FIG. 17 is a partially enlarged view of a preformat of a conventional optical recording medium, (a) is a plan view and (b) is a sectional view.

[Explanation of symbols]

 11 Transparent Substrate 12 Pit Part 13 High Part 21, 31, 41, 51 First Dielectric Film 22, 32 Magneto-Optical Film 23, 33, 43, 53 Second Dielectric Film 34, 54 Metal Film 42, 52 Phase change film 61 Transparent substrate 62 Pit part 63 High part 71, 81, 91, 101 First dielectric film 72, 82 Magneto-optical film 73, 83, 93, 103 Second dielectric film 84, 104 Metal film 92, 102 Phase change film 111 Transparent substrate 112 Pit part 113 High part 121, 131, 141, 151 First dielectric film 122, 132 Magneto-optical film 123, 133, 143, 153 Second dielectric film 134, 154 Metal film 142,152 Phase change film 1600,1700 Information track 1601,1701 Land part 1602 V-shaped groove part 1603 Pit part 1702 U-shaped glue Part 1703 the wall of the bent portion

Continuation of front page (56) Reference JP-A-4-362526 (JP, A) JP-A-57-138065 (JP, A) JP-A-3-122839 (JP, A) JP-A-3-84752 (JP , A) JP-A-1-171136 (JP, A) JP-A-4-48438 (JP, A) JP-A-1-165052 (JP, A) JP-A-4-302833 (JP, A) Institute of Information and Communication Engineers, New Media Technology Series Optical Disc ", Ohmsha, July 20, 1989, 1st edition, 2nd edition

Claims (15)

(57) [Claims] 1. Tracks for recording information are alternately provided on the surface of a transparent substrate at different heights, whereby high-altitude tracks and low-altitude tracks are alternately formed, and the high-altitude tracks and the low-altitude tracks are formed. 1. A recordable optical recording medium in which a concavo-convex pre-format for address identification is formed in each unit information section, wherein the low place track is recorded in the unit information section in the high place track.
An unevenness for address identification is formed in the form of a pit having the same height level as the height of the track, and a region of the same height as the height track is left in the low-place track for each unit information section.
The optical recording medium is characterized in that it is pre-formatted by forming unevenness for address identification in a rectangular shape . 2. The optical recording medium according to claim 1, wherein at least a first dielectric film, a magneto-optical film, and a second dielectric film are laminated on the surface of the transparent substrate. 3. The light according to claim 1, wherein at least a first dielectric film, a magneto-optical film, a second dielectric film, and a metal film are laminated on the surface of the transparent substrate. recoding media. 4. The optical recording medium according to claim 1, wherein at least a first dielectric film, a phase change film, and a second dielectric film are laminated on the surface of the transparent substrate. 5. The light according to claim 1, wherein at least a first dielectric film, a phase change film, a second dielectric film, and a metal film are laminated on the surface of the transparent substrate. recoding media. 6. A track for recording information is alternately provided on the surface of the transparent substrate at different heights, whereby high-altitude tracks and low-altitude tracks are alternately formed, and the high-altitude tracks and the low-altitude tracks are formed. It is a recordable optical recording medium in which a concavo-convex pre-format for address identification is formed for each unit information section, and the high-altitude track has a low location adjacent to each unit information section.
Concavities and convexities for address identification are formed in the form of a low part having the same height as the track, and a region having the same height as the high track is left in the low track for each unit information section.
An optical recording medium characterized in that it is pre-formatted by forming unevenness for address identification in a shape . 7. The optical recording medium according to claim 6, wherein at least a first dielectric film, a magneto-optical film, and a second dielectric film are laminated on the surface of the transparent substrate. 8. The light according to claim 6, wherein at least a first dielectric film, a magneto-optical film, a second dielectric film, and a metal film are laminated on the surface of the transparent substrate. recoding media. 9. The optical recording medium according to claim 6, wherein at least a first dielectric film, a phase change film, and a second dielectric film are laminated on the surface of the transparent substrate. 10. The light according to claim 6, wherein at least a first dielectric film, a phase change film, a second dielectric film, and a metal film are laminated on the surface of the transparent substrate. recoding media. 11. Tracks for recording information are alternately provided on the surface of the transparent substrate with different heights, whereby high-altitude tracks and low-altitude tracks are alternately formed, and the high-altitude tracks and the low-altitude tracks are formed. A recordable optical recording medium in which a concave and convex pre-format for address identification is formed for each unit information section, and the address identification is performed on the high-altitude track by narrowing the track width for each unit information section. Is formed on the low- altitude track for each unit information section.
The optical recording medium is characterized in that pre-formatting is performed by forming concavities and convexities for address identification while leaving a region of the same height . 12. The optical recording medium according to claim 11, wherein at least a first dielectric film, a magneto-optical film, and a second dielectric film are laminated on the surface of the transparent substrate. 13. The light according to claim 11, wherein at least a first dielectric film, a magneto-optical film, a second dielectric film, and a metal film are laminated on the surface of the transparent substrate. recoding media. 14. The optical recording medium according to claim 11, wherein at least a first dielectric film, a phase change film, and a second dielectric film are laminated on the surface of the transparent substrate. 15. The light according to claim 11, wherein at least a first dielectric film, a phase change film, a second dielectric film, and a metal film are laminated on the surface of the transparent substrate. recoding media.