JPH09231613A - Optical information recording medium - Google Patents

Optical information recording medium

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Publication number
JPH09231613A
JPH09231613A JP8063678A JP6367896A JPH09231613A JP H09231613 A JPH09231613 A JP H09231613A JP 8063678 A JP8063678 A JP 8063678A JP 6367896 A JP6367896 A JP 6367896A JP H09231613 A JPH09231613 A JP H09231613A
Authority
JP
Japan
Prior art keywords
information
middle area
information surface
light beam
transparent substrate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP8063678A
Other languages
Japanese (ja)
Inventor
Atsushi Onishi
厚 大西
Original Assignee
Nippon Columbia Co Ltd
日本コロムビア株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Columbia Co Ltd, 日本コロムビア株式会社 filed Critical Nippon Columbia Co Ltd
Priority to JP8063678A priority Critical patent/JPH09231613A/en
Publication of JPH09231613A publication Critical patent/JPH09231613A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To smooth transfer of data readout from the first information face to the second information face, in the continuous reproduction of an optical information recording medium for two-layer type one side reproduction in OTP (opposite track path) method, and also to facilitate the manufacturing process of an optical disk. SOLUTION: The medium is so structured that it is provided with transparent substrates 101, 108 transmitting an optical beam, the first information face 102 on which information can be optically recorded, reproduced or erased, and the second information face 109 on which the information formed on the first face 102 can be optically recorded, reproduced or erased; and that it is also provided with a middle area 105, 112 for transferring an optical beam from the first information face 102 to the second information face 109, in the outer periphery of these faces 102, 109. In this case, it is so designed that the outer peripheral position of the middle area 112 of the second information face 109 is situated on the more outer peripheral side of a disk than that of the middle area 105 of the first information face 102, and that the inner peripheral position of the middle area 112 of the second information face 109 is situated on the more inner peripheral side of the disk than that of the middle area 105 of the first information face 102.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has at least two information surfaces, and information recorded on these two information surfaces is recorded by irradiating a light beam from one surface,
The present invention relates to an optical information recording medium that can be reproduced or erased.

[0002]

2. Description of the Related Art A recording density of a compact disc (hereinafter referred to as
CD: Compact Disc. ) About 6 to 8 times higher than a digital video disk (DVD: Digital Video
Disc. ) Is under development. Depending on the recording capacity and function, a DVD (or SD: Super Density Di
sc) 4.7 (1 information layer, read-only type), 8.5 (2 information layer, 1-sided playback, read-only type), 9.4 (2 information side)
Layer, double-sided reproduction, read-only type, 17 (4 information layers, double-sided reproduction, read-only type), R (write-once type), RAM (rewritable type)
And many specifications have been proposed.

FIG. 3 shows a schematic view of a sectional structure of a conventional DVD. As shown in FIG. 3, the structure of the DVD has a diameter of 120
mm, a thickness of 0.6 mm, and a first transparent substrate 301 having a first information surface 302, and a second transparent substrate 303 having a diameter of 120 mm and a thickness of 0.6 mm and having a second information surface 304. The adhesive layer 305 having a thickness of about 40 μm is used for bonding. Here, the second information surface 304 may not be formed on the second transparent substrate 303. Two reproduction methods, single-sided reproduction and double-sided reproduction, are permitted.

In a double-sided reproduction type DVD, the surfaces of the first information surface 302 and the second information surface 304 are made of a metal such as aluminum (Al) or gold (Au) that reflects most of the light beam. Reflective layer 306 and second reflective layer 3
07. The reproduction of the information recorded on the first information surface 302 is performed through the first transparent substrate 301,
The reproduction of the information recorded on the second information surface 304 is performed through the second transparent substrate 303. This type is D
It is called VD (or SD) -9.4.

On the other hand, in a single-sided reproduction type DVD, the surface of the first information surface 302 is replaced with a reflective layer made of metal,
The first information surface 30 has a configuration in which it is covered with a semi-reflective layer made of a dielectric material such as silicon nitride (SixNy) and aluminum nitride (AlxNy) that transmits part of the laser light and reflects the rest.
This is a type in which both the information recorded on the second and second information surfaces 304 can be reproduced through the first transparent substrate 301. This type of DVD (or SD)-
Call it 8.5.

[0006] In addition, the Parallel Track P
ath (hereinafter referred to as PTP) and Opposite Track Path
Two methods (hereinafter referred to as OTP) have been proposed.
FIG. 4 is a schematic diagram showing the structure of a PTP type optical information recording medium. In the PTP type optical information recording medium, both the first information surface 402 and the second information surface 409 have a first lead-in area 403, a second lead-in area 410, and a first lead. Lead-out
area 405 and a second lead-out area 412, and reproduction is performed from the inner circumference side to the outer circumference side of the optical information recording medium on both information surfaces.

Therefore, when continuous reproduction of data across both information planes is performed, the first lead-out area 405 of the first information plane 402 to the second read-out area of the second information plane 409.
Therefore, it is necessary to move the optical pickup to the lead-in area 410.

FIG. 5 is a schematic view showing the structure of an OTP type optical information recording medium. The OTP type optical information recording medium has a lead-in area 503 on the first information surface 502 and a lead-out area 510 on the second information surface 509.
A first middle area 505 and a second middle area 512 are provided on the outermost peripheral portions of both information surfaces, respectively.
It has a structure having.

At present, in the DVD standard proposal, the position of the middle area in the optical information recording medium of the OTP system is the first middle area 5 in the case of a disk having a diameter of 120 mm.
05 and the second middle area 512, the inner peripheral position is a position between 70 and 116 mm in diameter, and the outer peripheral position is a diameter 119.
It is proposed to provide it at a position of mm.

When continuously reproducing the information recorded on the OTP type DVD, the light beam reproduces the information recorded on the lead-in area 503 of the first information surface 502, and then the first data. The program information recorded in the area 504 is reproduced.

From the first information surface 502 to the second information surface 50
In the case of performing continuous playback to 9, the first data area 504
After reproducing the information recorded in (1) from the inner circumference toward the outer circumference, the light beam reproduces the information recorded in the first middle area 505. Then, the reproduction surface is switched from the first information surface 502 to the second information surface 509, and the information recorded in the second data area 511 is reproduced from the outer circumference to the inner circumference.

As described above, in the case of continuous reproduction, since the reproduction surface is switched in the first middle area 505, the second middle area 512 is
It is necessary to be provided at a position that always overlaps with the area of the first middle area 505.

[0013]

However, for example, a DVD-8.5 disc has a first transparent substrate on which a first information surface including a first middle area is formed in advance, and a second transparent substrate on which the first information surface is formed in advance. Since the second transparent substrate on which the second information surface including the middle area is molded is bonded and produced, the positions of both middle areas will be displaced unless the positioning is performed quite rigorously. The diameter positions that do not overlap with each other are generated, which causes a decrease in yield in the manufacturing process.

Further, the DVD-17 disc has a semi-reflective layer formed on a first transparent substrate on which a first information surface including a first middle area is formed, and then a transparent transparent ultraviolet curable resin. A resin layer is applied, a stamper is pressed onto this transparent resin layer, and ultraviolet rays are radiated to form the second information surface. Therefore, similarly to DVD-8.5, a fairly strict alignment is performed. If not, the outer peripheral positions of both middle areas are displaced, and a diameter position where both middle areas do not overlap occurs, which causes a reduction in the yield in the manufacturing process.

As described above, when the playback surface is switched at a diameter position where both middle areas do not overlap, for example, at a position within the first middle area but not the second middle area, Since the second middle area does not exist above the first middle area, it is not possible to focus on the second information surface at that position, the playback operation is stopped, or the optical pickup is moved to another position. There was a problem that it took time to do.

The present invention has been made to solve the above-mentioned problems, and in an OTP type two-layer type single-sided reproducing optical information recording medium, the first information surface to the second information in continuous reproduction. An object of the present invention is to provide an OTP type optical information recording medium that can smoothly transfer data to the surface and facilitate the optical disk manufacturing process.

[0017]

In order to solve the above problems, according to the invention of claim 1 of the present invention, a transparent substrate which transmits a light beam and information can be optically recorded or reproduced or erased. A first information surface and a second information surface formed on the first information surface and capable of optically recording, reproducing or erasing information, and the first information surface and the second information surface. In an optical information recording medium having a middle area for making a transition of a light beam from the first information surface to the second information surface on the outer peripheral portion of the surface, the outer peripheral position of the middle area of the second information surface is the first position. Of the information surface on the outer peripheral side of the disc with respect to the outer peripheral position of the middle area, and the inner peripheral position of the middle area of the second information surface is larger than the inner peripheral position of the middle area of the first information surface,
It is characterized in that it is located on the inner peripheral side of the disk.

According to a second aspect of the present invention, a first transparent substrate having a first information surface on which information is optically reproducibly recorded by transmitting a light beam, and 1
And a second transparent substrate having a second information surface on which information is optically reproducibly recorded , A reflective layer formed to cover the second information surface to reflect most of the light beam, and an adhesive layer to transmit the light beam, with the semi-reflective layer and the reflective layer facing each other through the adhesive layer An optical information recording medium having a middle area for bonding the light beam from the first information surface to the second information surface, which is bonded to the outermost peripheral portion of the first information surface and the second information surface. , The outer peripheral position of the middle area of the second information surface is closer to the disc outer peripheral side than the outer peripheral position of the middle area of the first information surface, and the inner peripheral position of the middle area of the second information surface is Positioned on the inner circumference side of the disc rather than the inner circumference position of the middle area of the information surface. It is characterized in that.

According to the third aspect of the present invention,
A first transparent substrate having a first information surface on which information is optically reproducibly recorded by transmitting a light beam; and a part of the light beam formed by covering the first information surface and remaining. A first semi-reflective layer having a first semi-reflective layer which transmits light and a second information surface which is formed on the first semi-reflective layer and transmits a light beam to record information optically reproducibly A layer, a first reflective layer that covers the second information surface and reflects most of the light beam, and a second information surface that transmits the light beam and records information in an optically reproducible manner. A second transparent substrate having: a second semi-reflective layer which covers the second information surface and reflects a part of the light beam and transmits the rest; and a light which is formed on the second semi-reflective layer. A second transparent resin layer having a third information surface on which the beam is transmitted and information is optically reproducibly recorded, and a third information layer. A second reflective layer formed to cover the surface and reflecting most of the light beam, and an adhesive layer are provided, and the first reflective layer and the second reflective layer are attached so that they face each other. And the transition of the light beam from the first information surface to the second information surface and the third information surface at the outermost periphery of the first information surface, the second information surface, the third information surface, and the fourth information surface. In an optical information recording medium having a middle area for smoothly moving a light beam from the information surface of to the fourth information surface,
The outer peripheral position of the middle area of the second information surface is closer to the disc outer peripheral side than the outer peripheral position of the middle area of the first information surface, and the inner peripheral position of the middle area of the second information surface is the outer peripheral position of the first information surface. Is located on the inner side of the disc with respect to the inner circumferential position of the middle area, and the outer circumferential position of the middle area of the fourth information surface is on the outer circumferential side of the disc with respect to the outer circumferential position of the middle area of the third information surface; The inner peripheral position of the middle area of the fourth information surface is located closer to the inner peripheral side of the disc than the inner peripheral position of the middle area of the third information surface.

Further, according to the invention of claim 4 of the present invention,
A first transparent substrate that transmits a light beam; a first recording layer formed on the first transparent substrate and capable of recording, reproducing, or erasing information by the light beam; a second transparent substrate; A second recording layer formed on the transparent substrate and capable of recording / reproducing and / or erasing information by a light beam, and an adhesive layer that transmits the light beam, the first recording layer and the second recording layer The recording layer and the recording layer are bonded to each other via an adhesive layer so as to face each other, and the transition of the light beam from the first recording layer to the second recording layer is smoothly performed on the outer peripheral portions of the first transparent substrate and the second transparent substrate. In an optical information recording medium having a middle area for performing, the outer peripheral position of the middle area of the second transparent substrate is closer to the disc outer peripheral side than the outer peripheral position of the middle area of the first transparent substrate, and the second transparent substrate The inner peripheral position of the middle area is the first transparent substrate Than the inner circumferential position of the middle area,
It is characterized in that it is located on the inner peripheral side of the disk.

Further, according to the invention of claim 5 of the present invention,
A first transparent substrate which transmits a light beam, a first recording layer formed on the first transparent substrate and capable of recording, reproducing or erasing information by the light beam, and formed on the first recording layer A first transparent resin layer which transmits a light beam, a second recording layer which is formed on the first transparent resin layer and on which information can be recorded, reproduced or erased by the light beam, and a first transparent resin layer which transmits the light beam. A second transparent substrate, a third recording layer formed on the second transparent substrate and capable of recording, reproducing or erasing information by a light beam, and a third transparent layer formed on the third recording layer and transmitting the light beam. A second transparent resin layer and a fourth transparent resin layer formed on the second transparent resin layer and capable of recording, reproducing or erasing information by a light beam.
A recording layer and an adhesive layer, and the second recording layer and the fourth recording layer are pasted together with the adhesive layer facing each other,
The transition of the light beam from the first recording layer to the second recording layer and the third transparent substrate on the outer peripheral portion of the first transparent substrate, the first transparent resin layer, the second transparent substrate and the second transparent resin layer. In an optical information recording medium having a middle area for smoothly moving a light beam from the recording layer to the fourth recording layer, the outer peripheral position of the middle area of the first transparent resin layer is the middle area of the first transparent substrate. Is located on the disc outer peripheral side of the area outer peripheral position, the inner peripheral position of the middle area of the first transparent resin layer is located on the disc inner peripheral side of the inner peripheral position of the first transparent substrate, and The outer peripheral position of the middle area of the second transparent resin layer is closer to the disc outer peripheral side than the outer peripheral position of the middle area of the second transparent substrate, and the inner peripheral position of the middle area of the second transparent resin layer is the second transparent Displacement is lower than the inner peripheral position of the resin layer middle area. It is characterized in that located on the inner circumferential side.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.
This will be described in detail with reference to the drawings. FIG. 1 is a schematic view showing the cross-sectional structure of an OTP type optical information recording medium according to the first embodiment of the present invention.

The cross-sectional structure of the optical information recording medium according to the present embodiment has a lead-in area 103 and a first data area 1.
04 and the first middle area 105
The second information surface 102 is composed of a first transparent substrate 101 made of a polycarbonate resin or the like in which the information surface 102 is recorded in advance, a lead-out area 110, a second data area 111, and a second middle area 112. A second transparent substrate 108 made of a polycarbonate resin or the like 109 is previously recorded, and a first information surface 102 and a second information surface 102 with an adhesive layer 107 made of an ultraviolet curable resin or the like transmitting a light beam interposed therebetween. The surfaces 109 face each other, and the information surfaces are bonded to each other so that the distance between them is about 40 μm.

The first information surface 102 is made of silicon nitride (S
ixNy) or aluminum nitride (AlxNy) or other dielectric materials, low lead oxide (PbxOy) or other oxides, antimony sulfide (SbxSy) or other chalcogen-based materials, and ultrathin gold (Au) or aluminum (Al). ) Is covered with a semi-reflective layer 106 that reflects a part of the light beam and transmits the rest, and the second information surface 109 is gold (Au),
The reflective layer 113 is made of a metal material such as aluminum (Al) or silver (Ag) and reflects most of the light beam.

Here, in the optical information recording medium of the present invention, the outer peripheral position of the second middle area 112 is closer to the outer peripheral side of the disc than the outer peripheral position of the first middle area 105 and the second middle area 112 is. The inner peripheral position is provided closer to the inner peripheral side of the disc than the inner peripheral position of the first middle area 105.

That is, the second middle area 112 is
Since the inner and outer circumferences are larger than the first middle area 105, the second middle area 112 is always present on the first middle area 105. In addition, the focal point of the light beam is changed from the first information surface 102 to the second information surface 1
When moving to 09, even if the optical pickup moves in the radial direction due to vibration or the like, the light beam does not deviate from the second middle area 112.

In general, the optical information recording medium is often eccentric in the radial direction due to distortion or surface wobbling of the substrate.
Therefore, even if the middle areas of both substrates are recorded at exactly the same diameter position, misalignment occurs unless the substrates are bonded to each other with strict accuracy at the time of bonding the substrates.

However, in the optical information recording medium of the present invention, the second middle area 112 is replaced by the first middle area 1
Since the recording is performed in a larger area on both the inner and outer circumferences than 05, a large margin of alignment accuracy can be secured during the bonding step, and the manufacturing process can be facilitated.

Here, a specific example will be described. Current,
According to the DVD standard proposal, the maximum amount of eccentricity between the first information surface 102 and the second information surface 109 at the time of bonding is 10
It is set to 0 μm.

When the transparent substrate is molded by injection molding, eccentricity occurs due to the shrinkage of the resin. The amount of eccentricity varies depending on the injection molding machine and molding conditions, but generally a maximum of 5
It is said that about 0 μm occurs.

Therefore, the maximum eccentricity amount (100 μm) defined by the above-mentioned DVD standard and the eccentricity amount (50 μm in this embodiment) generated during the molding of the transparent substrate are taken into consideration (150 μm in this embodiment), respectively. Second middle area 11
By recording the area 2 in both the inner and outer peripheral directions larger than the area of the first middle area 105, the substrates having eccentricity at the time of molding will be the maximum defined by the DVD standard proposal. The second middle area 112 is always located on the first middle area 105 even when the two are bonded with the eccentricity amount.

FIG. 2 shows an OT according to the second embodiment of the present invention.
It is a schematic diagram which shows the structure of the cross section of a P-system optical information recording medium. The optical information recording medium of the present embodiment is one in which a substrate having two information surfaces is bonded to a single-sided disk, and four layers of information surfaces are provided in one disk.

A first information surface 202 including a first lead-in area 203, a first data area 204 and a first middle area is previously formed on the first transparent substrate 201 made of polycarbonate resin or the like by injection molding or the like. Is formed by.

The first information surface 202 is made of silicon nitride (S
ixNy) or aluminum nitride (AlxNy) or other dielectric materials, low lead oxide (PbxOy) or other oxides, antimony sulfide (SbxSy) or other chalcogen-based materials, and ultrathin gold (Au) or aluminum (Al). ) And the like, and is covered with a first semi-reflective layer 206 that reflects a part of the light beam and transmits the rest.

On the first semi-reflective layer 206, a first lead-out area 209 and a second lead-out area 209 made of an ultraviolet curable resin are formed.
The second information surface 208 having the data area 210 and the second middle area is formed with the first transparent resin layer 207 formed by the 2P (Photo Polymerization) method.

The surface of the second information surface 208 is covered with a reflective layer 212 which is made of a metal material such as gold (Au), aluminum (Al), silver (Ag) and reflects most of the light beam. .

The optical information recording medium of this embodiment has a structure in which two single-sided disks are bonded together via the adhesive layer 213, and one disk has four information surfaces. The information side is reproduced from both sides, and the first information side 20
The second and second information surfaces 208 are reproduced through the first transparent substrate 201, and similarly, the third information surface 221 and the fourth information surface 216 are reproduced through the second transparent substrate.

The optical information recording medium of this embodiment also has a first information surface 202 and a second information surface 202 as in the optical information recording medium of the first embodiment.
When the information surface 208 or the third information surface 221 and the fourth information surface 216 are continuously reproduced, the first information surface 202 or the third information surface 221 is reproduced from the inner circumference to the outer circumference, and then, The second information surface 208 or the fourth information surface 21
6 is reproduced from the outer circumference to the inner circumference.

Also in this embodiment, the outer peripheral positions of the second middle area 211 and the fourth middle area 215 are
First middle area 205 and third middle area 22
5, the inner peripheral position of the second middle area 211 and the fourth middle area 215 from the outer peripheral position of the outer peripheral position of 5, and the inner peripheral position of the first middle area 205 and the third middle area 225. Is also provided so as to be located on the inner peripheral side of the disc.

Therefore, since the second middle area 211 or the fourth middle area 215 exists on the first middle area 205 or the third middle area 225, the reproduction surface can be switched smoothly.

Also, when the second information surface 208 is formed on the first information surface 202 or the fourth information surface 216 is formed on the third information surface 221, by the 2P method, a margin of positioning accuracy is obtained. Can be greatly taken.

Also in the case of the second embodiment, in the DVD standard proposal, the second information surface 208 or the fourth information surface 216 is used.
And the maximum eccentricity amount between the first information surface 202 and the third information surface 221 is set to 100 μm.

As described in the first embodiment, when the transparent substrate is molded, eccentricity (generally about 50 μm) occurs due to the shrinkage of the resin.

Therefore, in this embodiment, the area of the second middle area 211 or the fourth middle area 215 is 150 μm each in both the inner and outer peripheral sides,
First middle area 205 or third middle area 2
If the recording is made larger than the area of 25, even if the recording layer is laminated on the transparent substrate having an eccentricity with the maximum eccentricity amount defined in the DVD standard proposal, the second middle area 2
The eleventh or fourth middle area 215 is located on the first middle area 205 or the third middle area 225.

In the above, in the first and second embodiments, the read-only type optical information recording medium has been described.
It goes without saying that the present invention can be applied to a write-once or rewritable optical information recording medium. In the case of the write-once type or the rewritable type, a pregroove is formed in the data area, not a pit, but the lead-in area, the middle area, and the lead-out area are formed in advance as prepits as in the reproducing type.

Therefore, as in the first and second embodiments, the outer peripheral position of the second middle area or the fourth middle area is set to be greater than the outer peripheral position of the first middle area or the third middle area. Is located on the outer circumference side of the disc, and the inner circumference position of the second middle area or the fourth middle area is located on the inner circumference side of the disk with respect to the inner circumference position of the first middle area or the third middle area. If formed in this way, the same effect as the read-only type can be obtained even in the write-once type or rewritable type optical information recording medium.

[0047]

According to the optical information recording medium of the present invention, when the upper information surface is continuously reproduced from the lower information surface, the reproducing surface is smoothly transferred from the lower information surface to the upper information surface. You can In addition, since a large margin of accuracy in the alignment at the time of bonding can be secured, the manufacturing process can be facilitated.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a cross-sectional structure of an OTP optical information recording medium according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a cross-sectional structure of an OTP type optical information recording medium according to a second embodiment of the present invention.

FIG. 3 is a schematic diagram of a cross-sectional structure of a conventional DVD.

FIG. 4 is a schematic diagram showing the structure of a PTP type optical information recording medium.

FIG. 5 is a schematic diagram showing the structure of an OTP type optical information recording medium.

[Explanation of symbols]

 101 first transparent substrate 102 first information surface 103 lead-in area 104 first data area 105 first middle area 106 semi-reflective layer 107 adhesive layer 108 second transparent substrate 109 second information surface 110 lead-out Area 111 Second data area 112 Second middle area 113 Reflective layer 201 First transparent substrate 202 First information surface 203 First lead-in area 204 First data area 205 First middle area 206 First Semi-reflective layer 207 first transparent resin layer 208 second information surface 209 first lead-out area 210 second data area 211 second middle area 212 first reflective layer 213 adhesive layer 214 second reflection Layer 215 Fourth middle area 216 Fourth information surface 217 Fourth data area 21 Second lead-out area 219 Second transparent resin layer 220 Second semi-reflective layer 221 Third information surface 222 Third data area 223 Second lead-in area 224 Second transparent substrate 225 Third middle Area 301 1st transparent substrate 302 1st information surface 303 2nd transparent substrate 304 2nd information surface 305 Adhesive layer 306 1st reflective layer 307 2nd reflective layer 401 1st transparent substrate 402 1st Information surface 403 First lead-in area 404 First data area 405 First lead-out area 406 Semi-reflective layer 407 Adhesive layer 408 Second transparent substrate 409 Second information surface 410 Second lead-in area 411 Fourth Second data area 412 Second lead-out area 413 Reflective layer 501 First transparent substrate 502 First information surface 50 Lead-in area 504 First data area 505 First middle area 506 Semi-reflective layer 507 Adhesive layer 508 Second transparent substrate 509 Second information surface 510 Lead-out area 511 Second data area 512 Second middle area 513 reflective layer

Claims (5)

[Claims]
1. A transparent substrate which transmits a light beam, a first information surface on which information can be optically recorded, reproduced or erased, and information which is formed on the first information surface and which is optically recorded or reproduced. A reproducible or erasable second information surface, and a light beam from the first information surface to the second information surface on an outer peripheral portion of the first information surface and the second information surface. In an optical information recording medium having a middle area for smooth transition, the outer peripheral position of the middle area of the second information surface is the first area.
Of the information surface on the outer peripheral side of the disc with respect to the outer peripheral position of the middle area, and the inner peripheral position of the middle area of the second information surface is within the disc relative to the inner peripheral position of the middle area of the first information surface. An optical information recording medium characterized in that it is located on the circumference side.
2. A first transparent substrate having a first information surface on which information is optically reproducibly recorded by transmitting a light beam; and a light beam formed to cover the first information surface. A semi-reflective layer that partially reflects and transmits the rest; a second transparent substrate having a second information surface on which information is optically reproducibly recorded; and a second information surface that covers the second information surface. A reflective layer that reflects most of the light beam, and an adhesive layer that transmits the light beam, and the semi-reflective layer and the reflective layer are bonded to each other via the adhesive layer so that they face each other. In an optical information recording medium having an information surface and a middle area for smoothly migrating a light beam from the first information surface to the second information surface, in an outermost peripheral portion of the second information surface, The outer peripheral position of the middle area of the second information surface is the first
Of the information surface on the outer peripheral side of the disc with respect to the outer peripheral position of the middle area, and the inner peripheral position of the middle area of the second information surface is within the disc relative to the inner peripheral position of the middle area of the first information surface. An optical information recording medium characterized in that it is located on the circumference side.
3. A first transparent substrate having a first information surface on which information is optically reproducibly recorded by transmitting a light beam, and a light beam formed to cover the first information surface. A first semi-reflective layer that partially reflects and transmits the rest, and a second information surface that is formed on the first semi-reflective layer and that transmits a light beam and records information in an optically reproducible manner. A first transparent resin layer having a layer, a first reflective layer formed to cover the second information surface and reflecting most of the light beam, and information that can be optically reproduced by transmitting the light beam. A second transparent substrate having a second information surface formed thereon, and a second semi-reflective layer that covers the second information surface and reflects a part of the light beam and transmits the rest. 2 has a third information surface formed on the semi-reflective layer and transmitting a light beam and recording information optically reproducibly A second transparent resin layer, a second reflective layer formed to cover the third information surface and reflecting most of the light beam, and an adhesive layer, the first reflective layer and the A second reflective layer is attached so as to face each other via the adhesive layer, and is provided on the outermost peripheral portion of the first information surface, the second information surface, the third information surface, and the fourth information surface. Transition of a light beam from the first information surface to the second information surface and the third
In an optical information recording medium having a middle area for smoothly moving a light beam from the second information surface to the fourth information surface, the outer peripheral position of the middle area of the second information surface is the first area.
The outer peripheral position of the middle area of the information surface is on the outer peripheral side of the disk, and the inner peripheral position of the middle area of the second information surface is on the inner peripheral side of the disk than the inner peripheral position of the middle area of the first information surface. And the outer peripheral position of the middle area of the fourth information surface is closer to the disc outer peripheral side than the outer peripheral position of the middle area of the third information surface, and within the middle area of the fourth information surface. An optical information recording medium, wherein a peripheral position is located on an inner peripheral side of the disc with respect to an inner peripheral position of a middle area of the third information surface.
4. A first transparent substrate that transmits a light beam, a first recording layer formed on the first transparent substrate and capable of recording, reproducing or erasing information by the light beam, and a second transparent substrate. A transparent substrate, a second recording layer formed on the second transparent substrate and capable of recording, reproducing and / or erasing information by a light beam; and an adhesive layer which transmits the light beam, A first recording layer and the second recording layer are bonded to each other via the adhesive layer so as to face each other, and the first recording layer and the second recording layer are formed on the outer peripheral portions of the first transparent substrate and the second transparent substrate. In an optical information recording medium having a middle area for smoothly moving a light beam to a second recording layer, the outer peripheral position of the middle area of the second transparent substrate is the middle area of the first transparent substrate. Is it on the disk outer circumference side than the outer circumference position? The optical information recording medium is characterized in that the inner peripheral position of the middle area of the second transparent substrate is located on the inner peripheral side of the disc with respect to the inner peripheral position of the middle area of the first transparent substrate.
5. A first transparent substrate that transmits a light beam, a first recording layer formed on the first transparent substrate and capable of recording, reproducing or erasing information by the light beam, and the first transparent substrate. A first transparent resin layer formed on the recording layer and transmitting a light beam, and a second recording layer formed on the first transparent resin layer and capable of recording, reproducing or erasing information by the light beam. A second transparent substrate that transmits a light beam, a third recording layer formed on the second transparent substrate and capable of recording, reproducing, or erasing information by the light beam; and a third recording layer on the third recording layer. A second transparent resin layer formed on the second transparent resin layer and transmitting a light beam; a fourth recording layer formed on the second transparent resin layer and capable of recording, reproducing or erasing information by the light beam; and an adhesive layer. The second recording layer and the fourth recording layer face each other. Bonded via the layer, the first transparent substrate, said first transparent resin layer, the second
Of the light beam from the first recording layer to the second recording layer on the outer periphery of the transparent substrate and the second transparent resin layer, and from the third recording layer to the fourth recording layer. In an optical information recording medium having a middle area for smoothly moving a light beam, the outer peripheral position of the middle area of the first transparent resin layer is larger than the outer peripheral position of the middle area of the first transparent substrate. The inner peripheral position of the middle area of the first transparent resin layer is closer to the inner peripheral side of the disc than the inner peripheral position of the middle area of the first transparent substrate, and the second transparent resin The outer peripheral position of the middle area of the layer is closer to the disc outer peripheral side than the outer peripheral position of the middle area of the second transparent substrate, and the inner peripheral position of the middle area of the second transparent resin layer is the second transparent resin layer. Inner circumference of the middle area of An optical information recording medium, characterized in that the optical information recording medium is located on the inner circumference side of the disc.
JP8063678A 1996-02-26 1996-02-26 Optical information recording medium Pending JPH09231613A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8063678A JPH09231613A (en) 1996-02-26 1996-02-26 Optical information recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8063678A JPH09231613A (en) 1996-02-26 1996-02-26 Optical information recording medium

Publications (1)

Publication Number Publication Date
JPH09231613A true JPH09231613A (en) 1997-09-05

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JP8063678A Pending JPH09231613A (en) 1996-02-26 1996-02-26 Optical information recording medium

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