JP2003006932A - Optical information recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical information recording medium which is excellent in jitter, C/N, and reproduction durability on the basis of a DVR-Blue system. SOLUTION: The optical information recording medium comprises at least a reflective layer, a recording layer including an organic dyestuff and a protective layer in this order on a substrate that has a and with a track pitch of 200-400 nm, a land part height of 20-100 nm and a land part width of 80-200 nm. The thickness of the protective layer is 75-130 μm. A laser beam of 450 nm or less through the protective layer and an objective lens with an aperture (NA) of 0.7 or more are used to carry out recording and reproduction on and from the land part.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording medium.
In particular, it relates to a write-once information recording medium in the heat mode.
To do. [0002] A large amount of character information, image information, and voice information
For optical density optical information recording media (DVD) for recording / reproducing
The demand for this is increasing. Especially digital high-definition
In order to support TV broadcast recording, optical information recording media
Research on optical density recording is underway. High density, record
As a recording method, a record used for recording / reproducing of an optical information recording medium is used.
-Shortening the wavelength of the laser beam
Increase the aperture (NA) of the objective lens used in the system
And so on. By the way, phase change type optical discs are known.
However, this is an alloy such as GeSbTe as the recording layer.
Layer and irradiate the recording layer with laser light
Instantaneous heating changes from crystalline to amorphous
Recording / playback using the reflectance that changes according to the phase change
This is a method. Using a recent phase change recording layer,
DVR-Blue system for recording and playback by the user
Was announced ("ISOM2000" 210-21
Page 1). This system is a land / groove recording system.
It is. The land / groove recording method is formed on the substrate.
Groove (groove) of the guide groove of the laser beam and the run
DVR-R is a method of recording in both of the recording area (mountain area).
This is a recording method adopted in AM (rewritable type). one
On the other hand, DVD includes DVD-RW (rewritable), DVD
+ RW (rewritable) standard is available, recording only to the groove
The groove recording method is adopted. The land / groove recording method uses groove recording.
Compared to the recording method, the track pitch is likely to increase and the density is increased.
Suitable, but already because the recording tracks are adjacent
When recording a track adjacent to a recorded track,
A cross track where the laser beam affects the recorded tracks.
Problems such as lases and cross strokes are likely to occur. Ma
Also, it is difficult to convert to DVR-ROA. In order to solve this problem, only the groove is recorded.
Phase change media adopting DVR-Blue system is announced
("ODS2001" pages 139-141). Ma
In addition, a write-once DVD that can be recorded once on a DVD
R is known. DVD-R uses a dye for recording.
Therefore, it is easy to collect pigments and the groove
It is a recording system. In addition, a short wave of laser light generally used
When lengthening and high NA of the objective lens,
The energy we have is large in inverse proportion to the wavelength
Due to the high density, when the laser light is shortened, the medium
The light energy applied to the light increases. Therefore, repeat
However, the durability when played back becomes a problem. Ensures playback durability
In order to maintain, there is a way to reduce the laser output during playback.
However, if the reproduction output is lowered, the reflectivity is lowered.
It causes F output drop, C / N drop, and jitter deterioration. In addition, DVD-R applies a pigment on substrate A.
Cloth, make a reflective layer, then apply a protective layer and another
The substrate B is bonded. During recording / reproduction, either on the board A side
On the groove part (convex part when viewed from the substrate A side).
The light is applied. Generally, the groove part
The dye is thicker, and the shape is
Heat easily accumulates in the groove, and the land (from the substrate A side)
The degree of modulation, C / N, and jitter are superior to those of concave parts.
The On the DVR-Blue system, on the board A
Only a reflective layer is formed, and a pigment is applied on the reflective layer.
A cover layer is formed. Recording / playback is on the cover layer side
The laser beam is incident, but compared with the conventional DVD
The lube part becomes a concave part when seen from the cover layer side, and RF output is low.
This causes C / N reduction and jitter reduction. [0010] The present inventors have developed an organic color.
In an optical information recording medium having a recording layer containing element, a substrate
Studying the width and height of the land and the thickness of the adhesive layer
DVR-Blue is recorded on the land part.
Playback degradation, RF output drop, C / N drop,
To obtain an excellent optical information recording medium with no deterioration
The headline and the present invention were completed. [0011] The above-mentioned problems are as follows.
This is achieved by the present invention. That is, the present invention
200-400 nm pitch, 20-1 land height
It has a land of 00nm and land width 80-220nm
Recording layer containing at least a reflective layer and an organic dye on the substrate
And a protective layer in this order, and the thickness of the protective layer is 75 to
130 μm optical information recording medium, wherein the protective layer
Through, laser beam below 450nm and aperture
Using an objective lens with an (NA) of 0.7 or more,
Optical information recording, characterized in that recording and reproduction are performed on the card section
It is a medium. In a preferred embodiment of the present invention,
The organic dye is a phthalocyanine dye, benzotria
Selected from the group of sol dyes and aminobutadiene dyes
The DETAILED DESCRIPTION OF THE INVENTION The optical recording medium of the present invention has a specific label.
Recording layer containing a reflective layer and organic dye
And having a layer structure in which a protective layer is provided in this order,
Recording and playback through the protective layer. The protective layer has a specific thickness and
Is done. The optical information recording medium of the present invention is 450 nm or less.
Objective lens with laser light and aperture (NA) of 0.7 or more
Is recorded on the recording layer on the land portion. -Substrate-The substrate is provided with lands, particularly spiral lands.
Land track pitch is 200-400n
m, preferably 260 to 340 nm, the land height is 2
0 to 100 nm, preferably 30 to 80 nm, land portion
The width is 80-220 nm, preferably 120-180 nm
It is. The optical information recording medium is as described above.
Recording that contains organic dyes on a substrate with a specific land
By providing a layer, C / N, jitter, and reproduction resistance
Excellent in durability and high-density recording without hindrance
Can do. Here, the above "track pitch", "land
"Part height" and "land part width" are as shown in FIG.
And observed in a cross-sectional view in a plane perpendicular to the extending direction of the land
When the distance Tp between the center lines of adjacent lands is
The pitch L from the base of the land is
The height of the end portion "is half the height of the Lh (1 / 2L
The width Lw in h) is the land portion width. Material of substrate used for optical recording medium of the present invention
As materials, polycarbonate, polymethyl methacrylate
Acrylic resin such as plastic sheets, polyvinyl chloride, vinyl chloride
Vinyl chloride resin such as polymer, epoxy resin, amorph
Plastics such as gas polyolefin and polyester
A polycarbonate substrate is used.
Preferably used. -Recording layer- The recording layer formed on the optical recording medium of the present invention comprises an organic dye.
The recording layer contains a known dye without limitation.
Can be used. Specifically, JP-A-4-74690, JP-A-4-74690
Hei 8-127174, JP-A-11-53758, Special
Kaihei 11-334204, JP-A-11-334205
No. 1, JP-A-11-334206, JP-A-11-334
No. 207, JP 2000-43423, JP 2000
-108513, JP-A-2000-158818
Dye listed, or triazole, triazi
, Cyanine, merocyanine, aminobutadiene, lid
Russianin, cinnamic acid, viologen, azo, oxonol
Benzoxazole and benzotriazole dyes are preferred
More preferably, phthalocyanine dyes,
Zotriazole dyes, aminobutadiene dyes
The The dye recording layer is formed by using the above-described dye.
Or anti-fading agent, binder, antioxidant, UV if necessary
Various additives such as absorbents, plasticizers, and lubricants are used as solvents.
Dissolve to prepare the coating solution, and then apply this coating solution to the substrate surface.
Apply to form a coating film and then dry.
I can. Dissolve pigments, anti-fading agents, etc. in solvents.
Sonication dispersion to ensure complete dissolution when dissolved
It is preferable to carry out. As an example of solvent for dye layer coating solution
Are butyl acetate, 2-methoxyethyl acetate, etc.
Ester, methyl ethyl ketone, cyclohexanone,
Ketones such as tilisobutylketone, dichloromethane,
Chlorinated charcoal such as 1,2-dichloroethane and chloroform
Amides such as hydrogen fluoride, dimethylformamide, cyclohexane
Hydrocarbons such as xanthine, tetrahydrofuran, ethyl ether
Ether, dioxane and other ethers, ethanol, n-
Propanol, isopropanol, n-butanol, di
Alcohols such as acetone alcohol, 2, 2, 3, 3
-Fluorinated solvents such as tetrafluoropropanol, ethyl
Ren glycol monomethyl ether, ethylene glycol
Rumonoethyl ether, propylene glycol monomethyl
List glycol ethers such as ruether
You can. The above solvents are considered in consideration of the solubility of the dye used.
Alone or in combination of two or more. Examples of binders include, for example, gelatin,
Cellulose derivatives, dextran, rosin, rubber, etc.
Natural organic polymer materials, polyurethane, polyethylene, polyethylene
Charcoal such as polypropylene, polystyrene and polyisobutylene
Hydrogen fluoride resin, polyvinyl chloride, polyvinylidene chloride,
Vinyl resins such as vinyl chloride-vinyl acetate copolymer,
Such as methyl reacrylate and polymethyl methacrylate
Lyl resin, polyvinyl alcohol, chlorinated polyethylene
Epoxy resin, butyral resin, rubber derivative,
Synthetic organic polymers such as Nord-formaldehyde resin
I can make it. A binder is used as a material for the dye recording layer.
The amount of binder used is 100 parts by weight of the dye.
0.2 to 20 parts by weight, preferably 0.5 to 10 parts
Part by mass, more preferably 1 to 5 parts by mass. The coloring matter in the coating solution thus prepared
The concentration of is generally in the range of 0.01 to 10% by mass,
Preferably it exists in the range of 0.1-5 mass%. As the coating method, spray method, spin coating
Coating method, dipping method, roll coating method, blade coating
Law, doctor roll method, screen printing method, etc.
be able to. Preferably, the variation in the pigment film thickness is small.
Comb and spin coating method is used because it enables uniform film formation
It is done. The dye recording layer may be a single layer or a multilayer. Dye record
The layer thickness is generally in the range of 20-500 nm, preferred
Or in the range of 50 to 300 nm. Application of dye coating solution
If the cloth temperature is in the range of 23 to 50 ° C, there is no problem.
Is preferably 24 to 40 ° C., more preferably 25
~ 37 ° C. -Reflective layer- The reflective layer formed on the optical recording medium of the present invention
High reflectivity, that is, reflectivity is 70% or more
Any reflective film can be used, examples of which are Mg, S
e, Y, Ti, Zr, Hf, V, Nb, Ta, Cr, M
o, W, Mn, Re, Fe, Co, Ni, Ru, Rh,
Pd, Ir, Pt, Cu, Ag, Au, Zn, Cd, A
l, Ga, In, Si, Ge, Te, Pb, Po, S
n, Bi and other metals and metalloids or stainless steel
Preferably contains Au or Ag
Reflective film, the main component of which is Ag or Au
A reflective film is particularly preferred. The reflective layer is, for example,
Apply emissive material by vacuum deposition, sputtering or ion pre-
Formed on the dye recording layer by coating.
You can. The thickness of the reflective layer is generally 10 to 800.
in the range of nm, preferably in the range of 20-500 nm.
And more preferably in the range of 50 to 300 nm. -Protective layer- The protective layer in the present invention is a laser used for recording and reproduction.
The light transmittance is preferably 80% or more.
The protective layer includes the following two aspects. First state
A cover film is provided on the recording layer via an adhesive layer.
The second embodiment is a curable type on the recording layer.
A one-layer structure in which a resin is provided and cured. First
The cover film used in the embodiment has a surface roughness of 5
A resin sheet of nm or less is used without any particular limitation
However, such materials include polycarbonate (Teijin
Pure Ace Co., Ltd., Teijin Chemicals Co., Ltd. Panlite
Etc.) Cellulose triacetate (Fuji Photo Film Co., Ltd.)
Fujitac, etc.), PET (Lumilar, etc., manufactured by Toray Industries, Inc.)
, Preferably polycarbonate and 3 vinegar
Acid cellulose is used. The thickness of the cover film is
5-125 μm is preferred, more preferably 50-1
00 μm. -Adhesive layer- In the first aspect, the cover film is bonded.
It is adhered to the recording layer by an agent. Adhesive strength and work
However, radiation curable adhesives are preferred.
It is used well. Radiation curable adhesives include electronic
Examples include linear curable adhesives and ultraviolet curable adhesives.
However, the latter is preferable because of excellent productivity. Two or more radiation curable adhesives per molecule
Monomer or resin having double bond of radiation functionality
For example, acrylic esters, acrylic
Methacrylic acid esters, methacrylic acid amides
, Allyl compounds, vinyl ethers, vinyl esters
And so on. Preferably bifunctional or higher acrylate
And a methacrylate compound. Bifunctional
Specific examples of (meth) acrylate monomers or resins
Ethylene glycol diacrylate, propylene
Glycol diacrylate, butanediol diacrylate
, Hexanediol diacrylate, diethylene glycol
Recall diacrylate, triethylene glycol dia
Chlorate, tetraethylene glycol diacryl
, Neopentyl glycol diacrylate, tripro
Pyrene glycol diacrylate, ethylene glycol
Dimethacrylate, propylene glycol dimethacrylate
, Butanediol dimethacrylate, hexanedio
Dimethacrylate, diethylene glycol dimethac
Relate, triethylene glycol dimethacrylate,
Tetraethylene glycol dimethacrylate, neopen
Tyl glycol dimethacrylate, tripropylene glycol
Aliphatic dio such as coal dimethacrylate
Using acrylic acid or methacrylic acid added to
Can. Polyethylene glycol, poly
Lopylene glycol, polytetramethylene glycol
Which polyether polyol to acrylic acid, methacryl
Polyether acrylate with added acid, polyether
Obtained from methacrylate, known dibasic acid, glycol
Acrylic acid and methacrylic acid
Polyester acrylate and polyester with added acid
Dimethacrylate can also be used. Also known polyols and polyisocyanates
Acrylic acid, methacrylate
Polyurethane acrylate and polyurea added with phosphoric acid
Tan methacrylate may be used. In addition, Bisfe
Nord A, bisphenol F, hydrogenated bisphenol
A, hydrogenated bisphenol F, and alkylene
Acrylic acid and methacrylic acid are added to the xide adduct.
Modified with isocyanuric acid alkylene oxide
Diacrylate, isocyanuric acid alkylene oxide
Modified dimethacrylate, tricyclodecane dimethanol
Diacrylate, tricyclodecane dimethanol dimethyl
Use also those with a cyclic structure such as tacrylate
Can do. As a radiation curable adhesive used in the present invention
When using an ultraviolet curable adhesive,
It is possible to add a photopolymerization initiator to the monomer or resin.
Necessary, a known photopolymerization initiator can be used,
Of these, aromatic ketone compounds are preferred. Aromatic ketonization
The compound is not particularly limited, but is used as an ultraviolet light source.
Produces the emission line spectrum of a mercury lamp that is normally used, 25
Of extinction coefficient at wavelengths of 4, 313 and 365 nm
A comparatively large thing is preferable. A typical example is a
Cetophenone, benzophenone, benzoin ethyl acetate
Tellurium, benzyl methyl ketal, benzyl ethyl keter
, Benzoin isobutyl ketone, hydroxydimethyl
Phenyl ketone, 1-hydroxycyclohexyl phenyl
Luketone, 2-2 diethoxyacetophenone, Mich
ler's ketone, and various aromatic ketone compounds
Things can be used. The mixing ratio of the aromatic ketone compound is heavy
0.5-20 quality for 100 parts by mass of compatible monomer and resin
Parts by weight, preferably 2-15 parts by weight, more preferably 3
-10 parts by mass. Clear as UV curable adhesive
A product with a photoinitiator added is commercially available.
You can use it. Mercury lamps are used as ultraviolet light sources
I can. For mercury lamps, use lamps of 20 to 200 W / cm
The speed is 0.3 to 20 m / min. Cover layer
The distance between the lamp and the mercury lamp is generally 1-30 cm.
Good. Electron beam accelerator used for electron beam curable adhesive
As a scanning method, double scanning method
Or a curtain beam method can be adopted, but it is preferable.
Is a curtain beam system that is relatively inexpensive and provides high output.
It is. As the electron beam characteristics, the acceleration voltage is 100 to 10
00 kV, preferably 150-300 kV, absorption
0.5 to 20 Mrad as dose, preferably 1 to 10
Mrad. The application method of the adhesive on the recording layer is especially
Although there is no limitation, a spin coating method is preferable. Adhesive layer
The thickness is preferably 5 to 130 μm, more preferred
10 to 40 μm. Also, the adhesive application temperature is
If it is within the range of 23 to 50 ° C, there is no particular problem, but it is preferable
Or 24 to 40 ° C., more preferably 25 to 37 ° C.
It is. As a curable resin used in the second aspect
The radiation curable adhesive used in the first aspect is
used. After curing this radiation curable adhesive
On the recording layer so that the thickness of the film is in the range of 75 to 130 μm
It is applied and cured to form a protective layer. -Other layers- The optical information recording medium of the present invention comprises the above-described reflective layer, recording layer,
In addition to the adhesive layer, any layer can be formed as needed
it can. For example, undercoat layer, sputter layer, protective layer, etc.
The <Undercoat layer> The undercoat layer is the substrate on the side where the reflective layer is provided.
On the surface, for the purpose of improving the flatness and adhesion,
It is preferable to form a layer. As a material for the primer layer
For example, polymethyl methacrylate, acrylic acid
Methacrylic acid copolymer, styrene / maleic anhydride copolymer
Coalescence, polyvinyl alcohol, N-methylol acrylic
Amides, styrene-vinyltoluene copolymers, chlors
Rufonated polyethylene, nitrocellulose, polyvinyl chloride
Nyl, chlorinated polyolefin, polyester, polyimi
, Vinyl acetate / vinyl chloride copolymer, ethylene / acetic acid
Vinyl copolymer, polyethylene, polypropylene, poly
Polymeric substances such as carbonates; Silane coupling agents, etc.
And surface modifiers. The subbing layer is prepared by dissolving the above materials in an appropriate solvent.
Is dispersed to prepare a coating solution, and then the coating solution is
Such as coats, dip coats and extrusion coats
It is formed by applying to the substrate surface by a coating method.
You can. The thickness of the undercoat layer is generally 0.005 to 20
in the range of 0.01 μm, preferably in the range of 0.01 to 10 μm.
It is a circle. <Sputtering layer> The sputtered layer is a heat-resistant protective layer.
Also known as recording and playback on one or both sides of the recording layer
The laser beam used has a high transmittance and is required for the recording layer.
It has a function to dissipate heat generated more than necessary.
preferable. There are no special rules for the material of the sputter layer.
Are preferably Si, Zn, Ag, Al, Ti, Sn,
Simple substance or compound of W, Cu, Ge, Mn, Sb, Zr
(Oxides, nitrides, sulfides, etc.) and more preferred
Or Si, Zn, Ag, Al, Ti, Sn, Ge.
Body or compound. These materials include melting point and rigidity
Considering various physical properties of the
Can be used alone, or two
You may use combining a seed | species or more. <Auxiliary protective layer> Optical information recording medium of the present invention
Furthermore, even if an auxiliary protective layer is provided on the protective layer,
Good. The auxiliary protective layer is made of, for example, an ultraviolet curable resin.
Consists of. Auxiliary protective layer, for example, UV curing
The mold adhesive is applied to the surface of the cover film by spin coating.
Then, irradiate with ultraviolet rays using an ultraviolet irradiation lamp.
To form by curing the UV curable adhesive.
Can. The present invention will be described in detail with reference to the following examples.
However, the present invention is not limited to these. [Example 1] Thickness 1.1 mm, diameter 120
mm spiral groove (land height 60n
m, land width 120 nm, track pitch 300 n
m) injection molded polycarbonate resin (Teijin Chemicals)
Polycarbonate, product name: Panlite AD550
3) Sputtering Ag on the surface of the substrate having the groove 1
A reflective layer having a thickness of 00 nm was formed. Thereafter, a phthalocyanine organic compound
Dye A (Orazole-GN: Ciba Specialty Chemi
(Cal; maximum absorption: 340 nm, 640 nm)
2 o'clock mixed with 2,3,3-tetrafluoropropanol
The coating solution for forming the recording layer is dissolved
Prepared. Prepare the coating solution on the reflective layer and set the rotation speed to 3
While changing from 00 rpm to 4000 rpm, 2
Apply by spin coating at 3 ° C and 50% RH
It was. Then, store at 23 ° C and 50% RH for 1 to 4 hours
Then, the recording layer (thickness: 100) is dried by holding.
nm). Thereafter, an ultraviolet curable adhesive is formed on the recording layer.
(Dainippon Ink Chemical Co., Ltd., SD-347, the above organic compound
(Soluble in products 0.05% by mass) by spin coating method
Apply at a rotational speed of 100 to 300 rpm,
Carbonate sheet (0.07mm thickness: made by Teijin Limited: product
(Pure Ace)), then 300rpm
From 30 to 4000 rpm, thickness 30 μm
After spreading the UV curable adhesive over the entire surface to become UV
UV curable adhesive by irradiating ultraviolet rays with a line irradiation lamp
The protective layer is formed by curing the optical information recording medium.
A body sample was made. Recording / playback is performed on the land (protective layer
Convex part). [Embodiment 2] In Embodiment 1, the substrate
As in Example 1, except that the height of the terminal portion is 20 nm
Thus, a sample of the optical information recording medium was produced. [Embodiment 3] In Embodiment 1, the substrate
Similar to Example 1 except that the height of the terminal portion is 100 nm
Thus, a sample of the optical information recording medium was produced. Example 4 In Example 1, the substrate
In the same manner as in Example 1, except that the width of the node portion is 220 nm.
Thus, a sample of an optical information recording medium was produced. [Embodiment 5] In embodiment 1, the substrate
In the same manner as in Example 1 except that the width of the node portion is 80 nm.
A sample of an optical information recording medium was produced. [Example 6] In Example 1, the UV curing
The amount of chemical adhesive dripping and spin coating rotation pattern
The thickness of the UV curable adhesive layer is adjusted to 50 μm.
Otherwise, the sample of the optical information recording medium is the same as in Example 1.
Was made. [Example 7] In Example 1, the UV curing
The amount of chemical adhesive dripping and spin coating rotation pattern
The thickness of the UV curable adhesive layer was adjusted to 5 μm.
Other than that, a sample of an optical information recording medium in the same manner as in Example 1.
Was made. [Example 8] In Example 1, as a dye,
The following benzotriazole dye (Dye B) was used.
Other than that, a sample of an optical information recording medium in the same manner as in Example 1.
Was made. ## STR1 ## [Example 9] In Example 1, as a dye,
Others using the following aminobutadiene dyes (Dye C)
Is a sample of an optical information recording medium as in Example 1.
Produced. Embedded image [Comparative Example 1] Recording / reproduction in Example 1
Other than the groove part (groove part as viewed from the protective layer side)
Were recorded and reproduced in the same manner as in Example 1. [Comparative Example 2] The height of the land portion of Example 1 is
The optical information was the same as in Example 1 except that the thickness was 120 nm.
A sample of the recording medium was prepared. [Comparative Example 3] The height of the land portion of Example 1 is
Except for 10 nm, the optical information recording was performed in the same manner as in Example 1.
Samples of recording media were made. [Comparative Example 4] The width of the land portion of Example 1 is 2
Except for 40 nm, the optical information recording was performed in the same manner as in Example 1.
Samples of recording media were made. [Comparative Example 5] The land width of Example 1 is 60 n.
The optical information recording medium is the same as in Example 1 except that m.
A sample of was prepared. [Comparative Example 6] UV curable adhesive of Example 1
Same as Example 1 except that the thickness of the agent layer was adjusted to 80 μm
Thus, a sample of the optical information recording medium was produced. [Comparative Example 7] UV curable adhesive of Example 1
The same as in Example 1 except that the thickness of the agent layer was adjusted to 3 μm.
Thus, a sample of the optical information recording medium was produced. [Comparative Example 8] Thickness 1.1 mm, diameter 120
mm spiral groove (land height 40n
m, land width 120 nm, track pitch 300 n
m) injection molded polycarbonate resin (Teijin Chemicals)
Polycarbonate, product name: Panlite AD550
3) Reflective layer (Ag; thickness 1) on the surface of the substrate having the groove
00nm), lower heat-resistant protective layer (ZnS-SiO) ₂ Thickness
170 nm), recording layer (AgInSbTe; thickness 25 n)
m), upper heat-resistant protective layer (ZnS-SiO) ₂ Thickness 35n
m) were formed by sputtering in this order. Thereafter, UV curing contact is applied on the upper heat-resistant protective layer.
Adhesive (Dainippon Ink & Chemicals, SD-347, above
Solubility in organic compounds 0.05 mass%)
Coating at a rotational speed of 100 rpm to 300 rpm
And polycarbonate sheet (0.07mm
Thick: Teijin Limited: product name Pure Ace)
After that, do not change from 300rpm to 4000rpm.
However, it is UV-cured on the entire surface to a thickness of 30 μm.
After spreading the agent, purple is irradiated with ultraviolet rays using an ultraviolet irradiation lamp.
Sample of optical information recording medium by curing external line curing adhesive
Was made. Recording / reproduction is grooved (recessed when viewed from the protective layer).
Part). [Comparative Example 9] Sample used in Comparative Example 8
The recording / reproduction was performed on the land portion. (Evaluation of recording characteristics of optical information recording medium) (1) Jitter evaluation A manufactured optical information recording medium was measured using a 405 nm laser, N
A: Recording / reproduction evaluation machine equipped with 0.85 pickup
(Pulstec Co., Ltd .: DDU1000)
On the condition that the back frequency is 66 MHz / linear speed is 5.6 m / s,
7PP modulation signal recording (laser power 6mW) playback
And jitter using a time interval analyzer
It was measured. (2) C / N (carrier-to-noise ratio) evaluation The produced optical information recording medium is converted into a 405 nm laser, N
A: Recording / reproduction evaluation machine equipped with 0.85 pickup
(Pulstec Co., Ltd .: DDU1000)
Single at a frequency of 66 MHz / linear speed of 5.6 m / s
Recording and playback with frequency signal (2T = 0.13μm)
Then, C / N was measured using a spectrum analyzer. (3) Evaluation of reproduction durability The produced optical information recording medium was converted into a 405 nm laser, N
A: Recording / reproduction evaluation machine equipped with 0.85 pickup
(Pulstec Co., Ltd .: DDU1000)
On the condition that the back frequency is 66 MHz / linear speed is 5.6 m / s,
7PP modulation signal is recorded (laser power 6mW)
Continuous playback 1 million times in chill mode (laser power 0.
4 mW), and the initial modulation degree is 100%.
The modulation deterioration after 10,000 times reproduction was measured. The evaluation results are shown in Table 1.
The [Table 1] From Table 1, the optical information recording medium of the example
, C / N, and reproduction durability are excellent.
Optical information recording media have poor jitter, C / N, and reproduction durability.
Shows that As described above, according to the present invention, DVR-
Excellent jitter, C / N, and playback durability with Blue system
An optical information recording medium can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-sectional view showing a cross section of a substrate in a plane perpendicular to a land extending direction. [Explanation of Symbols] Tp ... Track pitch Lh ... Land height Lw ... Land width

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI Theme code (reference) G11B 7/007 B41M 5/26 Y (72) Inventor Toshio Ishida 2-12-1, Ogimachi, Odawara-shi, Kanagawa F Photo term in Fuji Photo Film Co., Ltd. (reference) 2H111 EA03 EA12 EA22 EA37 EA48 FA12 FA14 FA30 FB42 5D029 JA04 LA02 LB07 WB11 WB17 WC01 5D090 AA01 BB03 BB07 CC14 EE01 FF11 GG01 GG10 KK06 LL01

Claims (1)

Claims: 1. A track pitch of 200 to 400 nm, a land portion height of 20 to 100 nm, and a land portion width of 80 to 220.
An optical information recording medium having at least a reflective layer, a recording layer containing an organic dye, and a protective layer in this order on a substrate having a land of nm, wherein the protective layer has a thickness of 75 to 130 μm, An optical information recording medium, wherein recording and reproduction are performed on the land portion through a protective layer using a laser beam of 450 nm or less and an objective lens having an aperture (NA) of 0.7 or more.