JPH10149576A - Optical information medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable stable clamping by preventing slip between disks and clampers in clamping regions and to enable printing and writing of characters, graphics, etc., by using water color ink on the surface parts from the clamping regions to center holes. SOLUTION: This optical information medium has the disk 1 formed with an information recording layer 2 on one main surface and another disk 5 stuck to the surface of the disk 1 formed with the information recording layer 2 via an adhesive. Hydrophilic resin films 7 are formed on the surfaces of the parts of the inner peripheral side information non-recording regions (i) from the center holes 4 of the disks 1, 5. The hydrophilic resin films 7 are moist, are rougher in the surfaces than the other parts consisting of non-hydrophilic resins and have elasticity. The hydrophilic resin films, therefore, have the high friction resistance with the clampers and are less slippery. Since these parts are the hydrophilic resin films, the parts may be printed afresh with the characters, graphics, designs, etc., by using the water color ink, etc., after the optical information medium is once produced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information medium in which an information recording area is formed on at least one surface of a light-transmitting substrate, and a main surface of the disk on which the information recording area is formed is bonded to another disk. About.

[0002]

2. Description of the Related Art With the recent development and commercialization of short-wavelength lasers, digital video discs (DVDs) capable of higher-density recording and reproduction have been put to practical use. This type of optical information medium employs a structure in which two disks are bonded.

A read-only optical information medium having such a double-sided bonding structure has a center hole in the center,
On the outer side, an inner information side non-recording area is provided. A pair of discs to be bonded to each other is formed of a translucent disk, and an information recording area is set on at least one main surface outside the inner-side information non-recording area, and information is recorded in this information recording area. A pit as a means is formed, and a reflection layer made of a metal film is formed thereon. As a recordable optical information medium, a tracking guide is formed in at least one of the information recording areas of the disc, and an organic dye or the like is applied thereon by means of a spin coating method or the like, and cured to form an optical interference layer. And a reflective layer made of a metal film is formed thereon. Further, the entire surface of the pair of disks is coated with a reactive curable resin as an adhesive by means of spin coating, screen printing, or the like, and these surfaces are overlapped so as to face each other.
It is conceivable that the two disks are stuck together.

[0004]

SUMMARY OF THE INVENTION In an optical information medium,
As described above, the two disks are bonded with an adhesive. However, in such an optical information medium, the surface portion of the disc in the inner peripheral side information non-recording area is smooth, so when the optical information medium player clamps and rotates the disc, the clamper and the disc are May slip. This causes troubles such as operation failure and reproduction failure due to displacement of the clamping position and uneven rotation.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned problems in a conventional optical information medium in which two disks are bonded with an adhesive, and a disk and a clamper in an inner-side information non-recording area are provided. Prevents slippage of the optical information medium and stably clamps the optical information medium, and prints or fills in characters and figures using water-based ink on the surface area from the clamp area to the center hole. Is what you do. In order to achieve this object, according to the present invention, in an optical information medium in which two disks 1 and 5 are adhered and adhered with an adhesive 11, information is not recorded on the inner peripheral side from the center hole 4 of the disks 1 and 5. The hydrophilic resin film 7 is formed on the surface of the portion extending over the region i.

That is, an optical information medium according to the present invention comprises a disc 1 having an information recording layer 2 formed on one main surface thereof, and an adhesive 1 having a surface on which the information recording layer 2 is formed.
1 and another disk 5 bonded together. Further, a hydrophilic resin film 7 is formed on the surface of the portion from the center hole 4 of the disks 1 and 5 to the inner peripheral side information non-recording area i.

[0007] For example, the hydrophilic resin film 7 is a hydrophilic ultraviolet curable resin film, and more specifically, polyethylene oxide, polyvinyl alcohol, polyvinyl methyl ether, polyvinyl formal, carboxyvinyl polymer, hydroxyethyl cellulose, hydroxypropyl. The film is formed of a hydrophilic resin containing at least one of cellulose, methylcellulose, carboxymethylcellulose sodium salt, polyvinylpyrrolidone, and morpholine.

In such an optical information medium, the disk 1,
5, a hydrophilic resin film 7 is formed on the surface of the portion from the center hole 4 to the inner peripheral side information non-recording area i. This hydrophilic resin film 7 is moist and has another portion made of non-hydrophilic resin. Has a rougher surface and is more resilient. For this reason, the frictional resistance with the clamper is large and it is hard to slip.
In addition, since it is a hydrophilic resin film, once an optical information medium is manufactured, characters, figures, designs, and the like can be printed there again using aqueous ink or the like.

[0009]

Embodiments of the present invention will now be described specifically and in detail with reference to the drawings. As an example of an optical information medium according to the present invention, an example of a write-once optical information medium having a single-sided recording / reproducing structure by bonding both sides is shown in FIGS. The disk 1 is a transparent disk-shaped substrate having a center hole 4 at the center. This disc 1 is best made of a transparent resin such as polycarbonate or polymethyl methacrylate (PMMA), but may be a glass substrate. This translucent disk 1
The information recording area r is set on one side outside the inner peripheral side information non-recording area i. A tracking guide 3 composed of a spiral groove is formed in the information recording area r of the disk 1. The standard pitch of the tracking guide 3 is 8 μm.

Further, the information recording area r of the disk 1
The information recording layer 2 is formed on the main surface of the portion. For example, first, an organic dye or the like is applied by a method such as spin coating to form a light interference layer 12, and a metal film such as gold, aluminum, silver, or copper or a metal film thereof is formed on the light interference layer 12. The reflection layer 13 made of an alloy film is formed. The light interference layer 12 and the reflection layer 13 constitute the information recording layer 2, and the portion where the information recording layer 2 is formed is the information recording area r.
Although a protective film such as a resin may be formed on the light reflecting layer 13, such a protective film is not provided in the examples shown in FIGS. 1 and 2. Further, an inner information side non-recording area i is set inside the information recording area r of the disk 1. 1 and 2, reference numeral 9 denotes a ring-shaped ridge 9 on the recording surface side, which is the main surface on the front side of the disk 1, and formed outside the information recording area r. This prevents the recording surface from touching the surface of another optical information medium when the optical information medium is superimposed.

On the other hand, a hydrophilic resin film 7 is formed on the surface of the disk 1 from the center hole 4 to the inner peripheral information non-recording area i. FIG.
In FIG. 2 and FIG. 2, only the surface of the other disk 5 described later is visible, but also on the surface side of the disk 1, the hydrophilic resin film 7 is formed on the surface from the center hole 4 to the inner peripheral information non-recording area i. Is formed.

Such a hydrophilic resin film 7 can be formed by coating the above positions on the surfaces of the disks 1 and 5 with a hydrophilic resin. Examples of such a hydrophilic resin include, for example, polyethylene oxide (polyethylene oxide), polyvinyl alcohol (polyvinyl alcohol),
Polyvinyl methyl ether (polyvinylmet)
hyl ether) polyvinyl formal (poly)
vinylformal, carboxyvinyl polymer, hydroxyethylcellulose
cellulose), hydroxypropylcellulose (hydroxypropylcellulose)
e), methylcellulose (methylcellul)
ose), sodium carboxymethylcellulose sodium cell
lulose), polyvinylpyrrolidone (polyvi)
nyl pyrolidone), morpholine (mor)
phosphine), ketone formaldehyde, styrene / maleic anhydride copolymer, shellac, dextrin,
Poly (pyrrolidonylethyl acrylate), polyacrylic acid and its metal salts, polyamine, polyacrylamide, polyethylene glycol, polydiethylaminoethyl (meth) acrylate, polyhydroxystyrene, polyvinylalkyl ether, polyvinylhydroxybenzoate, polyphthalic acid, Cellulose acetate hydroxydiene phthalate, for example L comprising a backbone of methyl methacrylate and a side chain of N-methylolacrylamide
Graft polymers such as H-40 (manufactured by Soken Kagaku), water-soluble alkyd, water-soluble polyester, water-soluble polyepoxy, polyamide, polyvinyl methyl ether,
Saponified polyvinyl acetate, carboxymethylcellulose, carboxymethylcellulose sodium salt, gum arabic, guar gum, sodium alginate and the like can be mentioned. Prepare at least one or more of these hydrophilic resins, a photopolymerizable monomer and a photoinitiator described below,
If necessary, other additives are blended for coating.

[0013] These resins are mixed in a controlled balance in consideration of the reliability and manufacturability of the optical information medium, such as weather resistance, water resistance and warpage. 5% by weight of hydrophilic resin
As mentioned above, the solubility limit (for example, about 50% by weight) can be considered, but it is desirable to set the range of 5 to 20% by weight.

It is desirable to add a photopolymerizable monomer to the hydrophilic resin. Further, a hydrophilic photopolymerizable monomer may be used instead of the resin. Examples of the hydrophilic photopolymerizable monomer include polyether-modified mono (meth) acrylate, (meth) acrylamide derivative, mono (meth) acrylate having an amino group, mono (meth) acrylate having a hydroxyl group, and mono (meth) acrylate having a phosphate group. At least one monomer selected from (meth) acrylates and nitrogen-containing cyclic vinyl monomers is exemplified. Specifically, dimethylacrylamide (SN-SX
-2833: manufactured by San Nopco), polyethylene, mono (meth) acrylate having a glycol unit, alkyl-substituted (meth) acrylamide, alkoxy-modified (meth) acrylamide, methylol-modified (meth) acrylamide, N, N-dimethylaminoethyl (meth) A) acrylate, N, N-diethylaminoethyl (meth) acrylate, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, polyhydric alcohol diglycidyl ether mono (meth) acrylate, alkylene oxide-modified mono (meth) acrylate phosphate , Caprolactone-modified mono (meth) acrylate phosphate, acryloylmorpholine, N-vinyloxazolidone, N
At least one selected from vinyl succinimide, N-vinyl pyrrolidone and N-vinyl caprolactam
Species of monomers. Further, in order to improve photocurability, (meth) acrylates of polyhydric alcohol and its alkylene oxide adduct, polyhydric alcohol diglycidyl ether di (meth) acrylate, and the like are used. These are appropriately added in an amount of about 50 to 100% by weight.

[0015] A photoinitiator is added to these to form an ultraviolet curable resin. Specific examples of the photoinitiator include acetophenone, benzophenone, Michler's ketone, benzyl benzoin, benzoin ether, benzoyl benzoate,
Benzyl dimethyl ketal, 1-hydroxycyclohexyl phenyl ketone, thioxanthones, benzyl,
-Ethylanthraquinone, methylbenzoyl formate, diacetyl and the like. These photoinitiators,
It is appropriately added in an amount of about 1 to 8% by weight, preferably 2 to 6% by weight. If the amount of the initiator is too large, the printing workability is liable to deteriorate. If the amount is too small, the curing time is long and the productivity is lowered, or the ultraviolet curability cannot be obtained. In addition, you may mix said resin with a photopolymerization monomer for viscosity adjustment.

An additive can be separately added to the hydrophilic resin material. For example, it is also desirable to incorporate a water-absorbing pigment, a wetting agent, a defoaming agent, a surface tension adjusting agent, and the like. Specifically, inorganic powders such as finely divided silica, talc, mica, calcium carbonate, titanium oxide, zinc white, colloidal silica, carbon black, red iron oxide, fine powders such as carboxymethylcellulose, dextrin, methylcellulose, etc .; Organic pigments such as polyvinylpyrrolidone, vinyl acrylate copolymer (Sumikagel SP-510: manufactured by Sumitomo Chemical Co., Ltd.), collagen powder, etc., insoluble in acrylates and the like, and known anionic or nonionic wetting agents (Nopco 2272RS)
N, Nopcowet 50, Nopcowet SN20T:
All are manufactured by San Nopco), antifoaming agent (Nopco 8034: manufactured by San Nopco, Dehydran 1620: manufactured by Henkel, AD9)
301: manufactured by Mitsubishi Rayon Co., Ltd., surface tension modifiers (perenol s43, s5: manufactured by Henkel), thickeners such as polyethyleneimine (SP103 Nippon Shokubai Co., Ltd.).

The water-absorbing pigment as an additive plays a role in adjusting the coefficient of friction with the clamper, the printability of the ink, or the workability in forming a hydrophilic film. The wetting agent improves the wettability, adjusts the fluidity, can obtain a low foaming agent, and uses the same equipment as another layer forming step in the manufacturing process of the optical information medium such as screen printing. Since it can be formed, manufacturing efficiency can be improved. An antifoaming agent or a surface tension adjusting agent can form a coating film without unevenness.

The hydrophilic resin includes water, ethyl alcohol, isopropyl alcohol, ethylene glycol,
It is desirable not to contain ethylcellosolve, dimethylfluamide or other solvents. The solvent may attack the underlying disks 1 and 5 and reduce the reliability. Also,
This is because if a solvent is contained, the viscosity or the like at the time of forming the hydrophilic resin film 7 by means such as screen printing changes, which causes inconvenience in production. The thickness of the hydrophilic resin film 7 is 5 to 30.
The thickness is in the range of microns, and such a film thickness can be obtained by appropriately mixing the above materials and adjusting the viscosity and the like. An appropriate pattern may be applied to the hydrophilic resin film itself in advance, or an appropriate display may be printed and formed using an aqueous ink in advance or after the production of the optical information medium.

The specific dimensions of the write-once optical information medium are as follows. The diameter of the center hole 4 of the disk 1, that is, the inner diameter of the disk 1 is 15 mm, the outer diameter of the disk 1 is 120 mm, and the thickness is 0.6 mm. is there. The hydrophilic resin film 7 as described above is formed on the surface portion of the disc 1 extending from the center hole 4 to the inner information side non-recording area i.
Further, a tracking guide 3 and an information recording layer 2 are provided in an area of the disk 1 from a diameter of 48 mm to 116 mm, and the information recording area is defined as an information recording area r. The information recording area r forms a pit that causes interference of light partially different from other parts between the incident light and the reflected light of the reproduction laser light by irradiation of the recording laser light, and records a signal. Area.

Further, another disk 5 is prepared in addition to the disk 1. The disk 5 is of the same size and made of the same material as the disk 1, but does not have the tracking guide 3 and the information recording layer 2 provided on the main surface as in the disk 1. Of course, the other disk 5 can also be provided with an information recording area r having the same tracking guide 3 and information recording layer 2 as the disk 1. As described above, this disk 5
A hydrophilic resin film 7 similar to that of the disk 1 is formed on the surface from the center hole 4 on the front surface side to the inner peripheral side information non-recording area i.

Next, these two disks 1 and 5 are bonded together. For example, a reactive curing resin is applied as an adhesive 11 to at least one main surface of the two disks 1 and 5 by means of a spin coating method, a screen printing method, or the like, and these surfaces are overlapped with each other. And the reactive hardening resin is hardened. Thereby, the principal surfaces of the two disks 1 and 5 are bonded to each other by the adhesive 11 formed by curing the reactive cured resin. In this case, the surface of the disk 1 on which the information recording layer 2 is formed is bonded.

For example, with at least one of the disks 1 and 5 to be bonded facing upward, an uncured UV-curable resin is dropped as the adhesive 11 on the same surface, and the disks 1 and 5 are rotated. To level the resin. Thereafter, predetermined surfaces of the two disks 1 and 5 to be bonded are overlapped with each other. Thereby, the adhesive is applied to the disc 1,
5 spreads between the disks 1 and 5 due to the pressure applied from the disk 5 and the capillary phenomenon. When the adhesive spreads over the entire inner peripheral information non-recording area i between the disks 1 and 5, both disks 1 and 5 are rotated at a high speed to shake off the excess ultraviolet curable resin. Next, the ultraviolet curable resin is irradiated with ultraviolet rays from one side of the transparent disks 1 and 5 and cured to form a layer of an adhesive 11, and the disks 1 and 5 are tightly fixed by the adhesive 11. .

As another example, a cationic UV curable resin is applied to the entire surface of at least one of the disks 1 and 5 to be adhered, and the UV curable resin is irradiated with the UV curable resin to start slow curing. After that, two discs 1,
The predetermined surfaces 5 to be bonded are overlapped with each other. Next, the resin is cured while pressing both disks 1 and 5 in the thickness direction to form an adhesive 11, and the disks 1 and 5 are tightly fixed by the adhesive 11. In addition to this,
A thermoplastic resin-based adhesive can also be used as the adhesive. In consideration of the impact resistance of the optical information medium, the hardness of the adhesive layer after curing is preferably higher than the hardness of the substrate.

In the above example, the information recording area r of the transparent substrate is used.
A disc 1 on which a tracking guide 3 and an information recording layer 2 are formed, and another disc 5 on which an information recording layer is not formed.
This is an example in which are bonded together. In these cases, recording / reproduction is possible on only one side. The other disk 5 may have no translucency, may be colored for maintaining light resistance, or may have a surface provided with a character, pattern, or writable area.

On the other hand, two discs 1 provided with a tracking guide 3 and an information recording layer 2 in an information recording area r of a light-transmitting substrate are prepared, and these information recording layers 2 are adhered to each other. A combined optical information medium having a so-called double-sided recording / reproducing structure can also be used. As the other disk 5 used in this case, one of the disks 1 and 5 shown in FIG. 1 in which the tracking guide 3 and the information recording layer 2 are formed in the information recording area r like the disk 1 is used.

[0026]

As described above, in the optical information medium according to the present invention, the slip between the discs 1 and 5 and the clamper in the information non-recording area i on the inner peripheral side is prevented, and the optical information medium can be stably clamped. After the completion of the optical information medium, the center hole 4
Using water-based ink or the like in the portion over the area, characters and figures can be printed or written again.

[Brief description of the drawings]

FIG. 1 is an exploded half cross-sectional perspective view showing an example of an optical information medium according to the present invention in a state before two disks are bonded together.

FIG. 2 is a partial longitudinal sectional view showing the optical information medium.

[Explanation of symbols]

 Reference Signs List 1 disc 2 information recording layer 4 center hole 5 disc 7 hydrophilic resin film 8 rough surface 11 adhesive c inner information side non-recording area

[Procedure amendment]

[Submission date] October 13, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

A read-only optical information medium having such a double-sided bonding structure has a center hole in the center,
On the outer side, an inner information side non-recording area is provided. A pair of discs to be bonded to each other is formed of a translucent disk, and an information recording area is set on at least one main surface outside the inner-side information non-recording area, and information is recorded in this information recording area. A pit as a means is formed, and a reflection layer made of a metal film is formed thereon. As a recordable optical information medium, a tracking guide is formed in at least one information recording area of a disc, and an organic dye or the like is applied thereon by a method such as a spin coating method.
An interference layer is formed, and a reflective layer made of a metal film is formed thereon. Further, the entire surface of the pair of disks is coated with a reactive curable resin as an adhesive by means of spin coating, screen printing, or the like, and these surfaces are overlapped so as to face each other. It is possible that the disks are stuck together.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

[0009]

Embodiments of the present invention will now be described specifically and in detail with reference to the drawings. As an example of an optical information medium according to the present invention, an example of a write-once optical information medium having a single-sided recording / reproducing structure by bonding both sides is shown in FIGS. The disk 1 is a transparent disk-shaped substrate having a center hole 4 at the center. This disc 1 is best made of a transparent resin such as polycarbonate or polymethyl methacrylate (PMMA), but may be a glass substrate. This translucent disk 1
The information recording area r is set on one side outside the inner peripheral side information non-recording area i. A tracking guide 3 composed of a spiral groove is formed in the information recording area r of the disk 1. The standard pitch of the tracking guide 3 is 0.8 μm .

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

Further, the information recording area r of the disk 1
The information recording layer 2 is formed on the main surface of the portion. For example, first, an organic dye or the like is applied by a method such as spin coating to form a light interference layer 12, and a metal film such as gold, aluminum, silver, or copper or a metal film thereof is formed on the light interference layer 12. The reflection layer 13 made of an alloy film is formed. The light interference layer 12 and the reflection layer 13 constitute the information recording layer 2, and the portion where the information recording layer 2 is formed is the information recording area r.
A protective film such as a resin may be formed on the light reflection layer 13 , but may not be formed . Further, an inner information side non-recording area i is set inside the information recording area r of the disk 1. In FIGS. 1 and 2, reference numeral 9 denotes a ridge 9 formed in a ring shape on the recording surface side, which is the main surface on the front side of the disk 1, outside the information recording area r.
This prevents the recording surface from touching the surface of another optical information medium when the optical information medium is superimposed.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

Such a hydrophilic resin film 7 can be formed by coating the above positions on the surfaces of the disks 1 and 5 with a hydrophilic resin. Examples of such hydrophilic resin, for example, polyethylene oxide (polyethylen e oxide), polyvinyl alcohol (polyvinyl alcohol),
Polyvinyl methyl ether (polyvinylmet)
hyl ether) polyvinyl formal (poly)
vinylformal, carboxyvinyl polymer, hydroxyethylcellulose
cellulose), hydroxypropylcellulose (hydroxypropylcellulose)
e), methylcellulose (methylcellul)
ose), sodium carboxymethylcellulose sodium cell
lulose), polyvinylpyrrolidone (polyvi)
nyl pyrolidone), morpholine (mor)
phosphine), ketone formaldehyde, styrene / maleic anhydride copolymer, shellac, dextrin,
Poly (pyrrolidonylethyl acrylate), polyacrylic acid and its metal salts, polyamine, polyacrylamide, polyethylene glycol, polydiethylaminoethyl (meth) acrylate, polyhydroxystyrene, polyvinylalkyl ether, polyvinylhydroxybenzoate, polyphthalic acid, Cellulose acetate hydroxydiene phthalate, for example L comprising a backbone of methyl methacrylate and a side chain of N-methylolacrylamide
Graft polymers such as H-40 (manufactured by Soken Kagaku), water-soluble alkyd, water-soluble polyester, water-soluble polyepoxy, polyamide, polyvinyl methyl ether,
Saponified polyvinyl acetate, carboxymethylcellulose, carboxymethylcellulose sodium salt, gum arabic, guar gum, sodium alginate and the like can be mentioned. Prepare at least one or more of these hydrophilic resins, a photopolymerizable monomer and a photoinitiator described below,
If necessary, other additives are blended for coating.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction contents]

The hydrophilic resin includes water, ethyl alcohol, isopropyl alcohol, ethylene glycol,
Ethyl cellosolve, it is desirable not contain others solvents dimethyl e formamide. The solvent may attack the underlying disks 1 and 5 and reduce the reliability. Also,
This is because if a solvent is contained, the viscosity or the like at the time of forming the hydrophilic resin film 7 by means such as screen printing changes, which causes inconvenience in production. The thickness of the hydrophilic resin film 7 is 5 to 30.
The thickness is in the range of microns, and such a film thickness can be obtained by appropriately mixing the above materials and adjusting the viscosity and the like. An appropriate pattern may be applied to the hydrophilic resin film itself in advance, or an appropriate display may be printed and formed using an aqueous ink in advance or after the production of the optical information medium.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Change

[Correction contents]

For example, an ultraviolet curable resin which is not cured on the same surface as the adhesive 11 is dropped with at least one of the surfaces of the disks 1 and 5 to be bonded facing upward . Thereafter, predetermined surfaces of the two disks 1 and 5 to be bonded are overlapped with each other. Thereby, the adhesive is applied to the disc 1,
5 spreads between the disks 1 and 5 due to the pressure applied from the disk 5 and the capillary phenomenon. When the adhesive spreads over the entire inner peripheral information non-recording area i between the disks 1 and 5, both disks 1 and 5 are rotated at a high speed to shake off the excess ultraviolet curable resin. Next, the ultraviolet curable resin is irradiated with ultraviolet rays from one side of the transparent disks 1 and 5 and cured to form a layer of an adhesive 11, and the disks 1 and 5 are tightly fixed by the adhesive 11. . ────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] November 10, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

[0009]

Embodiments of the present invention will now be described specifically and in detail with reference to the drawings. As an example of an optical information medium according to the present invention, an example of a write-once optical information medium having a single-sided recording / reproducing structure by bonding both sides is shown in FIGS. The disk 1 is a transparent disk-shaped substrate having a center hole 4 at the center. This disc 1 is best made of a transparent resin such as polycarbonate or polymethyl methacrylate (PMMA), but may be a glass substrate. This translucent disk 1
The information recording area r is set on one side outside the inner peripheral side information non-recording area i. A tracking guide 3 composed of a spiral groove is formed in the information recording area r of the disk 1 .

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Emiko Hamada 6-16-20 Ueno, Taito-ku, Tokyo Within Taiyo Electric Power Co., Inc. (72) Inventor Tohru Fujii 6-16-20 Ueno, Taito-ku, Tokyo Taiyo Induction Co., Ltd.

Claims (3)

[Claims] 1. A disc (1) having an information recording layer (2) formed on one main surface, and an adhesive (11) applied to a surface of the disc (1) on which the information recording layer (2) is formed. In an optical information medium having another disk (5) bonded through the surface, a surface of a portion from the center hole (4) of the disks (1) and (5) to the inner peripheral side information non-recording area (i) An optical information medium characterized in that a hydrophilic resin film (7) is formed on the optical information medium. 2. The optical information medium according to claim 1, wherein the hydrophilic resin film is a hydrophilic ultraviolet curable resin film. 3. The hydrophilic resin film (7) is made of polyethylene oxide, polyvinyl alcohol, polyvinyl methyl ether, polyvinyl formal, carboxyvinyl polymer, hydroxyethylcellulose, hydroxypropylcellulose, methylcellulose, sodium carboxymethylcellulose, polyvinylpyrrolidone, and morpholine. 3. The optical information medium according to claim 1, wherein the optical information medium is formed of a resin containing at least one of them.