JP2002015471A - Optical recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical recording medium in which a visible information layer can be visually and easily read out through a visible light transmissive optical recording layer and reflection noise of recording and reproducing light radiated on the optical recording medium due to the visible information layer is reduced. SOLUTION: In the optical recording medium obtained by stacking at least a transparent substrate 2, a visible light transmissive optical recording layer 3 and a visible information layer 6, the layer 6 comprises a light reflecting material and a light selective transmissive layer 5 containing a light selective transmissive material which transmits visible light and absorbs optical recording and reproducing light is disposed between the optical recording layer 3 and the visible information layer 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording medium,
In particular, it relates to an optical memory card having a large number of visible information layers.

[0002]

2. Description of the Related Art In recent years, an optical memory card or a hybrid card combining an optical memory with an IC memory or a magnetic memory has been proposed, and some of them have been commercialized. The card media includes an optical memory unit,
In addition to the magnetic recording layer, the IC memory, and the barcode, logo printing information indicating the attributes of the card, advertisement printing information of the issuer, and personal information such as a photo of the card owner, an ID number, and a name are provided on the card surface. Is required. In an optical memory card and a hybrid card in which an optical recording section occupies a large area of the card surface, an optical recording layer and an IC
Since no visible information printing layer is provided on the chip, a sufficient visible information printing layer cannot be provided on the card surface.

To solve these problems, Japanese Patent Laid-Open No.
JP-A-3059, JP-A-6-5587 and JP-A-5-254283, in which a visible light transmitting optical recording layer is used as an optical recording layer, and a visible information layer is read through the visible light transmitting optical recording layer. An optical memory card (hereinafter, abbreviated as an optical card) that can perform the following has been proposed.

A semiconductor laser beam is used for recording and reproducing information on these optical cards. Light having a wavelength in the near infrared region having a wavelength of 650 to 850 nm is used as the semiconductor laser beam.

[0005]

As the printing of the visible information layer, not only black but also white, and a reflective material such as gold or silver is used to improve the quality of the card. The inventor of the present invention provides an optical card medium capable of reading visible print information through a visible light transmitting optical recording layer, wherein the visible information layer is formed of a white print layer, and a gold, silver or other reflective print layer. If the laser beam used for recording / reproducing information on the optical recording layer has a reflectance difference between a portion where the visible information layer is present and a portion where the laser beam is not present, the recording / reproducing laser beam detecting device detects noise as a noise during recording / reproducing. Found to be. Also, when the reflective visible information layer contains a silver scattering reflective pigment or the like, the recording / reproducing laser beam transmitted through the recording layer during recording / reproducing is reflected by the scattering reflective material, and a light detection device of a reader / writer is used. May be detected as noise, which may cause AT departure.

The present invention has been made to solve the above problems.
Optical recording in which the visible information layer can be easily read visually through the visible light transmitting optical recording layer, and the reflection noise of recording / reproducing light applied to the optical recording medium due to the visible information layer has been reduced. It is intended to provide a medium.

[0007]

That is, a first aspect of the present invention provides at least a transparent substrate, a visible light transmitting optical recording layer,
In an optical recording medium having a visible information layer laminated thereon, the visible information layer is made of a light-reflective material, and transmits visible light between the visible light transmitting optical recording layer and the visible information layer to perform optical recording / reproduction. An optical recording medium provided with a light selective transmission layer containing a light selective transmission material that absorbs light.

The light selective transmission layer has a transmittance of light having a wavelength of 400 to 700 nm of 60% or more and 700 to 900 n.
The transmittance of light having a wavelength of m is preferably 60% or less. It is preferable that the reflectance of the light selective transmission layer at a wavelength of 700 to 900 nm is 10% or less.

According to a second aspect of the present invention, there is provided an optical recording medium comprising at least a transparent substrate, a visible light transmitting optical recording layer, an adhesive layer and a visible information layer laminated on each other, wherein the visible information layer is formed of a light reflective material. Wherein the adhesive layer contains a light selective transmissive material that transmits visible light and absorbs optical recording / reproducing light.

The adhesive layer containing the light selective transmissive material has a transmittance of 60% or more for light having a wavelength of 400 to 700 nm and a transmittance of 60 for light having a wavelength of 700 to 900 nm.
% Is preferred. The adhesive layer containing the light selective transmission material has a reflectance of 1 at a wavelength of 700 to 900 nm.
It is preferably 0% or less.

[0011] The third invention of the present invention relates to a light-emitting device comprising at least a transparent substrate, a visible light transmitting optical recording layer, a transparent protective substrate, a first visible information layer, a concealing layer and a second visible information layer. In the recording medium, the first visible information layer is made of a light-reflective material, and the transparent protective substrate contains a light-selective transmissive material that transmits visible light and absorbs optical recording / reproducing light. An optical recording medium.

The transparent protective substrate containing the light selective transmissive material has a transmittance of light having a wavelength of 400 to 700 nm of 60% or more and a transmittance of light having a wavelength of 700 to 900 nm of 6 or more.
It is preferably 0% or less. Preferably, the transparent protective substrate is made of a resin, and a thermal decomposition temperature of the light selective transmissive material contained in the transparent protective substrate is equal to or higher than a melting point of the resin of the transparent protective substrate.

Japanese Patent Application Laid-Open No. Sho 62-16256 discloses an invention in which an opaque resin layer is provided under an optical recording layer in order to reduce the amount of light transmitted through the recording layer, reflected and returned to the recording layer again. It has been done. However, JP-A-62-2
Japanese Patent No. 16256 does not disclose or suggest the basic configuration of an optical recording medium according to the present invention, in which a visible image can be recognized through an optical recording layer, and a technical problem based thereon.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The optical recording medium of the first invention of the present invention is at least a transparent substrate, a visible light transmitting optical recording layer, an optical recording medium having a visible information layer laminated, the visible information layer is made of a light reflective material, And a light selective transmission layer containing a light selective transmission material that transmits visible light and absorbs optical recording / reproducing light is provided between the visible light transmitting optical recording layer and the visible information layer. I do.

FIG. 1 is a schematic sectional view showing an example of the optical recording medium according to the first invention of the present invention. The optical recording medium shown in the figure is configured as follows. First, the hard coat layer 1 is formed on the surface of the transparent substrate 2 on which the preformat pattern 9 is not formed on which the preformat pattern is not formed, and the visible light transmitting light is formed on the surface of the preformat pattern 9. A recording layer (hereinafter, referred to as an optical recording layer) 3 is provided. On the other hand, the light selective transmission layer 5 is formed on one surface of the transparent protective substrate 71, the reflective visible information layer 6 is formed on the light selective transmission layer 5, the concealing layer 10 is provided thereon, Is provided, and an overcoat layer 11 is provided thereon to form a protective substrate 12. The protective substrate 12 is bonded to the transparent substrate 2 on which the optical recording layer 3 is formed via a transparent adhesive layer 4 to obtain an optical recording medium.

As described above, the light selective transmission layer 5 is provided between the transparent protective substrate 71 and the reflective visible information layer 6 or the adhesive layer 4.
And the transparent protective substrate 71.

As shown in FIG. 1, when the protective substrate is transparent, the reflective visible information layer is preferably provided on the surface of the transparent protective substrate opposite to the optical recording layer. The reason is that the distance between the reflective visible information layer and the optical recording layer is increased, and the amount of reflected recording / reproducing light from the reflective visible information layer is less likely to enter the detection system of the recording / reproducing apparatus. In this case, the light selective transmission layer is
It can be provided between the transparent protective substrate and the reflective visible information layer.

FIG. 2 is a schematic sectional view showing another example of the optical recording medium of the first invention of the present invention. The optical recording medium shown in the figure is configured as follows. First, the hard coat layer 1 is formed on the surface of the transparent substrate 2 on which the preformat pattern 9 is not formed, on which the preformat pattern is not formed, and the optical recording layer 3 is formed on the surface of the preformat pattern 9.
Is provided. On the other hand, the reflective visible information layer 6 is formed on one surface of the opaque protective substrate 70, the light selective transmission layer 5 is formed on the reflective visible information layer 6, and the opaque protective substrate 71
The second visible information layer 8 is provided on the other surface, and the overcoat layer 11 is provided thereon to form the protective substrate 13. The protective substrate 13 is bonded to the transparent substrate 2 on which the optical recording layer 3 is formed via a transparent adhesive layer 4 to obtain an optical recording medium.

As shown in FIG. 2, when the protective substrate is opaque, the reflective visible information layer is provided on the optical recording surface side of the opaque protective substrate, and thus the light selective transmission layer is composed of the reflective visible information layer and the adhesive layer. It is provided between. 1 and 2, the reflective visible information layer is visually observed from the hard coat surface via the optical recording layer.

In the present invention, the light selective transmission layer 5 is characterized by containing a light selective transmission material that transmits visible light and absorbs optical recording / reproducing light. As the light selective transmission material included in the light selective transmission layer, at least a dye material is used. Dye precipitates inside the light selective transmission layer, 1 to 10 μm
Crystals of the order of magnitude cause noise in optical recording / reproducing light during recording / reproducing. Therefore, it is desirable that crystals of the dye do not precipitate inside the light selective transmission layer.

When a single layer of a dye layer containing a dye material is provided as the light selective transmission layer, the dye can be dissolved in an organic solvent that does not dissolve the substrate, and can be provided on the protective substrate by a solvent coating method. . When the light selective transmission layer is made of a resin and a dye, the dye is dissolved in a resin dissolved in a solvent, and printing techniques such as normal screen printing, planographic printing, and gravure printing are used.
It can be provided on the protective substrate by a general coating method such as a doctor blade method and a spin coating method.

As the light selective transmission layer, a layer in which a dye material and a resin material are mixed is preferable to a single layer made of a single dye.
By mixing the dye material and the resin, the light selective transmission layer can be more easily applied than the dye single layer. Further, by dispersing the pigment material in the resin, the pigment material has an effect of reducing the reflectance of the optical recording / reproducing light beam and reducing the noise of the light beam reflected from the light selective transmission layer.

The dye material constituting the light selective transmission layer includes 4
It transmits visible light of 00 to 700 nm, and 700 to 900
A dye that absorbs a recording / reproducing light beam of nm is used. As the dye material used as the light selective transmissive material, an aminium salt compound represented by the following general formula (I), a diimonium salt compound represented by the following general formula (II), or at least a solvent-soluble phthalocyanine compound is used.

Aminium salt compounds

[0025]

Embedded image

.Diimonium salt compounds

[0027]

Embedded image

In the general formulas (I) and (II), R _{1 to} R ₈
Represents a substituted or terminally substituted alkyl group having 1 to 8 carbon atoms, a substituted or terminally substituted alkenyl group, a substituted or terminally substituted aralkyl group, or a substituted or terminally substituted alkynyl group. Further, a combination of R ₁ and R ₂ , R ₃ and R ₄ , R ₅ and R _6, and R ₇ and R ₈ together with N may be substituted or terminally substituted 5-membered ring, substituted or terminally substituted 6-membered ring, substituted or A terminally substituted 7-membered ring may be formed. The substituents of R _{1 to} R ₈ may be the same or different. X
^- represents an anion.

In the general formulas (I) and (II), R ₁
Preferably, at least one of R ₈ is an alkoxyalkyl group.

Solvent-soluble phthalocyanine compound A phthalocyanine that is soluble is most suitable. In particular, the soluble phthalocyanine represented by the following general formula (III)
It is preferable because it has absorption at 0 to 1000 nm.

[0031]

Embedded image

(Where Y is

[0033]

Embedded image Represents

R ₁₁ , R ₁₂ , R ₁₃ and R ₁₄ each independently represent an alkyl group having 1 to 8 carbon atoms: Z represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, and a carbon atom. 1 to
4 alkoxyl groups, alkoxycarbonyl groups having 1 to 4 carbon atoms or halogen; W represents an alkoxyl group or acyl group having 1 to 4 carbon atoms: e, f and j are each independently N is an integer from 1 to 8; and p and q are each independently an integer from 1 to 6. ad is an integer from 0 to 2 and the sum of ad is 1 to 8; and M represents a metal-free, metal, metal oxide, metal carbonyl, or metal halide.

The above dyes are soluble in solvents used for printing, such as alcohols and ketones. Therefore, the pigment used in the present invention is dissolved without depositing on the transparent printing ink medium resin.

As the resin material for dispersing the coloring material, a resin soluble in some solvents can be used. For example, a medium material transparent to visible light used for screen printing is preferable. These resins are formed of polyester, vinyl chloride resin, vinyl acetate copolymer, acrylic resin, a polymer of acrylic polyol and isocyanate, or a mixture thereof.

The content of the dye contained in the resin is 3 to 20.
%, Preferably 3 to 10% by weight. If it is less than 3% by weight, the effect of the light selective transmission layer is not exhibited, and if it exceeds 20% by weight, the adhesion of the resin to the protective substrate is reduced.

The light selective transmission layer shown above has a thickness of 400 to 70.
The transmittance of light having a wavelength of 0 nm is 60% or more and 700%
It is preferable that the transmittance of light having a wavelength of ｎｍ900 nm is 60% or less. The light selective transmission layer has a thickness of 700 to 900 nm.
Is preferably 10% or less.

In the present invention, as the reflective visible information layer 6, a reflective material is used. Specific examples of the reflective material include a white reflective material, a transparent medium containing 10 aluminum powders.
A silver reflective material containing ３０30% by weight, and a gold reflective material containing 5-30% by weight of brass powder in a transparent medium. Further, a reflective material such as a relight material in which a thermoplastic material is coated on an aluminum vapor-deposited film can be used.

As the transparent substrate 2, a transparent resin is preferable. For example, vinyl chloride resin, acrylic resin, polycarbonate, polysulfone, polyolefin resin and the like are used.

For the optical recording layer 3, a silver salt type in which silver is dispersed in gelatin, a tellurium alloy, an organic dye, or the like can be used. In particular, the present invention is effective for a recording medium using an organic dye having low heat resistance.

The optical recording layer 3 transmits visible light,
Any material that can be recorded with a laser beam having a wavelength of 700 to 900 nm is not particularly identified. As a material through which the visible information layer can be easily read through the optical recording material, an organic dye is preferably used for the recording material.

Next, in the present invention, when the wavelength of the light used for recording, for example, the wavelength of a light beam such as a semiconductor laser is in the range of 650 nm or more, particularly in the range of 700 to 900 nm, the optical recording layer 3 is used. It is preferable to have an absorption maximum wavelength in the wavelength region of the beam, and it is preferable that the energy required for an optically detectable change to be caused by irradiation of the light beam is small. Further, it is preferable that the difference in optical characteristics between the information recording portion and the non-recording portion is large with respect to the light used for reproduction.

Examples of the substance used for the optical recording layer 3 in the present invention include anthraquinone derivatives (particularly those having an indathrene skeleton), dioxazine compounds and derivatives thereof, triphenodithiazine compounds, phenanthrene derivatives, cyanine compounds, and the like. Merocyanine compounds, pyrylium compounds, xanthene compounds, triphenylmethane compounds, croconium dyes, azo dyes, crocones, azines, indigoids, polymethine dyes, azulene dyes, squarium dyes, cyanines with polymethine chains And organic dye substances such as dyes based on tetraphenylcyanine.

In particular, in the present invention, when a polymethine dye represented by the following general formula (1) is used for an optical recording layer, an information recording medium having particularly excellent durability can be obtained.

[0046]

Embedded image

(Wherein A, B, D and E represent a hydrogen atom, an alkyl group, an alkenyl group, an aralkyl group, an aryl group,
Shows a group selected from styryl and a heterocyclic group.
r ₁ ′ and r ₂ ′ represent a group selected from a hydrogen atom, an alkyl group, a cyclic alkyl group, an alkenyl group, an aralkyl group and an aryl group, k is 0 or 1, L is 0, 1 or 2
And X ^- represents an anion. A, B, D,
The aralkyl group, aryl group, styryl group and heterocyclic group in E, r ₁ ′ and r ₂ ′ may be substituted. )

The abbreviations in the above general formula will be described in more detail. A, B, D and E represent a hydrogen atom or an alkyl group (for example, a methyl group, an ethyl group, an n-propyl group, an is
o-propyl group, n-butyl group, sec-butyl group, i
so-butyl group, t-butyl group, n-amyl group, t-amyl group, n-hexyl group, n-octyl group, t-octyl group, etc.), and other alkyl groups, for example, substituted alkyl groups ( For example, 2-hydroxyethyl, 3-hydroxypropyl, 4-hydroxybutyl, 2-acetoxyethyl, carboxymethyl, 2-carboxyethyl, 3-carboxypropyl, 2-sulfoethyl, 3-sulfoethyl Propyl group, 4-sulfobutyl group,
3-sulfatepropyl group, 4-sulfatebutyl group, N- (methylsulfonyl) -carbamylmethyl group,
Cyclic alkyl groups (for example, cyclohexyl group) such as 3- (acetylsulfamyl) propyl group and 4- (acetylsulfamyl) butyl group, alkenyl groups (vinyl group, propenyl group, butenyl group, pentenyl group, Hexenyl, heptenyl, octenyl, dodecynyl,
A aralkyl group (eg, benzyl group, phenethyl group, α-naphthylmethyl group, β-naphthylmethyl group), a substituted aralkyl group (eg, carboxybenzyl group, sulfobenzyl group, hydroxybenzyl group, etc.), Aryl group (for example, phenyl group), substituted aryl group (for example, diethylaminophenyl group)
Is included.

R ₁ ′ and r ₂ ′ represent a hydrogen atom or an alkyl group (for example, methyl group, ethyl group, n-propyl group, is
o-propyl group, n-butyl group, sec-butyl group, i
so-butyl group, t-butyl group, n-amyl group, t-amyl group, n-hexyl group, n-octyl group, t-octyl group, etc.), and other alkyl groups such as substituted alkyl groups. (For example, 2-hydroxyethyl group, 3-
Hydroxypropyl group, 4-hydroxybutyl group, 2-
Acetoxyethyl, carboxymethyl, 2-carboxyethyl, 3-carboxypropyl, 2-sulfoethyl, 3-sulfopropyl, 4-sulfobutyl, 3-sulfopropyl, 4-sulfobutyl, N- (methylsulfonyl) -carbamylmethyl group, 3- (acetylsulfamyl) propyl group, 4-
(Acetylsulfamyl) butyl group), cyclic alkyl group (eg, cyclohexyl group), alkenyl group (vinyl group, propenyl group, butenyl group, pentenyl group, hexenyl group, heptenyl group, octenyl group, dodecynyl group, Prenyl group), aralkyl group (for example,
Benzyl group, phenethyl group, α-naphthylmethyl group, β
-Naphthylmethyl group) and substituted aralkyl groups (for example, carboxybenzyl group, sulfobenzyl group, hydroxybenzyl group, etc.).

The optical recording layer containing these organic dyes may contain a stabilizer such as an infrared absorbing compound for the purpose of improving light resistance. Materials used as stabilizers include, for example,
163245 and JP-A-60-236131.
Or the following (VI),
Substances represented by the formula (VII) are mentioned.

[0051]

Embedded image

Wherein R is a hydrogen atom, a lower alkyl group,
X ₁ is an acid ion, A is

[0053]

Embedded image Is shown. Here, n is an integer of 1 or 2. )

In the above formulas (VI) and (VII),
Compounds in which the substituent R is an alkoxyalkyl group (for example, a methoxyethyl group), an alkenyl group (for example, a propenyl group), an alkynyl group (for example, a propargyl group), or a cyclic alkyl group (for example, a cyclopentyl group) is This is a particularly suitable material when the optical recording layer is formed by wet coating because of its excellent function of stabilizing the organic dye and its excellent solubility in a solvent.

In the present invention, the material constituting the optical recording layer is preferably one that decomposes or melts at a temperature of 140 ° C. for about 60 seconds to lower the reflectance of the optical recording layer. Further, it is preferable to add the substances represented by the formulas (VI) and (VII).

Examples of the quencher having the effect of stabilizing the organic dye include the following (VIII) to (X)
II) The metal complex represented by the formula can also be used.

[0057]

Embedded image

[0058]

Embedded image

[0059] (wherein, to no R ₂₁ R ₂₄ may be the same or different, each represents a substituted or unsubstituted alkyl group, an aryl group or an amino group, R ₂₅
To R ₂₈ may be the same or different, each represents a hydrogen atom, a halogen atom, or a substituted or unsubstituted alkyl group or amino group, and M represents Ni, C
represents a transition metal selected from o, Mn, Cu, Pd and Pt. )

The content of the stabilizer and the quencher contained in the optical recording layer 3 is usually 5 to the content of the dye.
The range is preferably from 50 to 50% by weight, more preferably from 10 to 30% by weight. Further, in the optical recording layer of the present invention, the organic dye, stabilizer and quencher described above may be contained in a binder in a dispersed state or a dissolved state.

The binder used in the present invention includes:
For example, nitrocellulose, cellulose phosphate, cellulose sulfate, cellulose acetate, cellulose propionate,
Cellulose butyrate, cellulose myristate, cellulose palmitate, cellulose acetate / propionate, acetate
Cellulose esters such as cellulose butyrate, cellulose ethers such as methylcellulose, ethylcellulose, propylcellulose and butylcellulose, polystyrene, polyvinyl chloride and the like can be used.

In the case where an organic dye is formed as an optical recording layer by wet coating, the organic solvent that can be used at the time of coating depends on whether the organic dye is in a dispersed state or a dissolved state. Alcohols such as methanol, ethanol, isopropanol and diescent alcohol; ketones such as acetone, methyl ethyl ketone and cyclohesaquinone; N, N-dimethylformamide;
Use of amides such as N, N-dimethylacetamide, sulfoxides such as dimethyl sulfoxide, ethers such as tetrahydrofuran, dioxane, ethylene glycol monomethyl ether, aliphatic halogenated hydrocarbons such as dichloromethane, dichloroethylene and trichloroethylene, and hydrocarbons. Can be.

Further, as a method for applying these coating solutions to the transparent substrate, known coating methods such as dip coating, spray coating, spinner coating, bar coating, blade coating, roll coating, curtain coating and the like can be used. It is formed.

The thickness of the optical recording layer is 400 to 1200.
The range of Å is preferable, but it is usually preferable to set the film thickness so that the surface reflectance is maximized by the correlation between the film thickness of the recording layer and the reflectance, since an excellent C / N signal can be obtained. When a reflection layer is provided on the surface opposite to the light beam incident surface side, it is preferable to set the film thickness so that the surface reflectance of the recording layer is minimized, because the recording sensitivity is improved.

The adhesive layer 4 is not particularly limited as long as it does not lower the reflectance of the optical recording layer. In organic dye recording media, non-solvent type hot melt adhesives,
It is suitable because it does not mix with the optical recording layer.

The ethylene-acrylic acid copolymer contained in the adhesive is, for example, as shown by the following structural formula (XIII)

[0067]

Embedded image (However, a, b, and n are positive integers)

The polyethylene has a structure in which a carboxyl group is randomly included in the structure of the polyethylene. The ethylene-acrylate copolymer is, for example, as shown in the following structural formula (XIV). A copolymer,

[0069]

Embedded image (However, a, b, and n are positive integers, R: CH ₃ , C ₂ H ₅ ,
C ₃ H ₇ )

The ethylene-methacrylic acid copolymer is
For example, as shown by the following structural formula (XV), the polyethylene has a structure in which a carboxyl group is randomly included in the molecular structure of polyethylene.

[0071]

Embedded image (However, a, b, and n are positive integers)

Further, the ethylene-methacrylic acid ester copolymer has, for example, the structure represented by the following structural formula (XVI).

[0073]

Embedded image (However, a, b, and n are positive integers, R: CH ₃ , C ₂ H ₅ ,
C ₃ H ₇ )

Among the above copolymers, ethylene-acrylic acid copolymer (EAA), ethylene-methyl acrylate copolymer (EMA), ethylene-methacrylic acid copolymer (EMAA) and ethylene- Methyl methacrylate copolymer (EMMA) is preferred.

The adhesive used in the present invention contains at least one of the above four kinds of copolymers, and may contain a mixture of two or more kinds of copolymers. Further, in the present invention, two or more different copolymers of the same type of copolymer, for example, a mixture of an ethylene-methyl methacrylate copolymer and an ethylene-ethyl methacrylate copolymer are mixed in the adhesive. May be contained.

In the present invention, the content of acrylic acid, acrylic acid ester, methacrylic acid or methacrylic acid ester in the copolymer can be calculated by quantifying the absorption of carbonyl in an infrared absorption spectrum.

In the present invention, examples of additives to be added to the adhesive layer include tackifiers and softeners. Examples of the tackifiers include rosin, polymerized rosin, hydrogenated rosin, rosin ester and the like. Resins and their modified products, aliphatic compounds, alicyclic compounds, aromatics, petroleum resins, terpene resins, terpene / phenol resins, hydrogenated terpene resins, cumarone resins, and the like. , Paraffin oil, castor oil, polybutene, low molecular weight polyisoprene and the like. Further, an ultraviolet absorber or the like may be added to the adhesive layer in the present invention, if necessary, as long as it does not cause an interaction with the optical recording layer and does not change the above-mentioned physical properties.

The above adhesive is preferably used in the present invention, but is not particularly limited as long as it does not affect the optical recording layer at 80 ° C. or lower and has high adhesion. In order to further enhance the effects of the present invention, an adhesive that melts at least at 100 to 150 ° C is preferable. This is because when the anti-counterfeiting layer is to be reproduced, a hot press step at 130 to 150 ° C. is necessary, and the adhesive is melted by hot press molding and protrudes to the outer peripheral portion of the optical card, or the optical recording layer This is because counterfeiting of the optical card is revealed because there remains evidence such as a decrease in reflectivity or generation of bubbles in the adhesive layer due to melting.

The protection substrates 70 and 71 are made of vinyl chloride resin,
Acrylic resin, polycarbonate, ABS resin and the like are used. The selection of the protection substrate is selected so as to reduce the warpage of the card.

The overcoat layer 11 is formed for protecting the printing layer of the second visible information layer 8. The material of the overcoat layer needs to be a transparent resin. Examples of the material include a thermoplastic resin such as an acrylic resin, a vinyl chloride resin, and a polyester, and a vinyl chloride resin is particularly preferable.

The formation of the resin layer of the overcoat layer is performed by printing, thermal transfer, or heat-sealing a resin sheet. The thickness of the overcoat layer is 50 μm or less, preferably 30 to 50 μm.

Next, an optical recording medium according to a second aspect of the present invention is an optical recording medium comprising at least a transparent substrate, a visible light transmitting optical recording layer, an adhesive layer and a visible information layer laminated on each other. The information layer is made of a light reflective material, and the adhesive layer contains a light selective transmissive material that transmits visible light and absorbs optical recording / reproducing light.

FIG. 3 is a schematic sectional view showing an example of the optical recording medium according to the second invention of the present invention. The optical recording medium shown in the figure is configured as follows. First, the hard coat layer 1 is formed on the surface of the transparent substrate 2 on which the preformat pattern 9 is not formed, on which the preformat pattern is not formed, and the optical recording layer 3 is formed on the surface of the preformat pattern 9.
Is provided. On the other hand, the reflective visible information layer 6 is formed on one surface of the transparent protective substrate 71, and the concealing layer 10 is provided thereon,
Further, the second visible information layer 8 is provided, and the overcoat layer 11 is provided thereon to form the protective substrate 14. The transparent substrate 2 on which the optical recording layer 3 is formed is placed on the protective substrate 14 via a transparent adhesive layer 44 made of an adhesive containing a light selective transmission material that transmits visible light and absorbs optical recording / reproducing light. To form an optical recording medium.

As shown in FIG. 3, when the protective substrate is transparent, the reflective visible information layer is preferably provided on the surface of the transparent protective substrate opposite to the optical recording layer. The reason is that the distance between the reflective visible information layer and the optical recording layer is increased, and the amount of reflected recording / reproducing light from the reflective visible information layer is less likely to enter the detection system of the recording / reproducing apparatus.

FIG. 4 is a schematic sectional view showing another example of the optical recording medium according to the second invention of the present invention. The optical recording medium shown in the figure is configured as follows. First, the hard coat layer 1 is formed on the surface of the transparent substrate 2 on which the preformat pattern 9 is not formed, on which the preformat pattern is not formed, and the optical recording layer 3 is formed on the surface of the preformat pattern 9.
Is provided. On the other hand, the reflective visible information layer 6 is formed on one surface of the opaque protection substrate 70, and the opaque protection substrate 70
The second visible information layer 8 is provided on the other surface, and the overcoat layer 11 is provided thereon to form the protection substrate 15. The transparent substrate 2 on which the optical recording layer 3 is formed is formed by interposing a protective substrate 15 via a transparent adhesive layer 44 made of an adhesive containing a light selective transmission material that transmits visible light and absorbs optical recording / reproducing light. An optical recording medium is obtained by bonding.

As shown in FIG. 4, when the protective substrate is opaque, the reflective visible information layer is provided on the optical recording surface side of the opaque protective substrate. 3 and 4, the reflective visible information layer is visually observed from the hard coat surface via the optical recording layer.

The second invention of the present invention is characterized in that the adhesive layer is made of an adhesive containing a light selective transmissive material that transmits visible light and absorbs optical recording / reproducing light.

As the light selective transmission material, the same coloring material as the material described in the first invention is used. It is also desired that the dye crystals do not precipitate inside the adhesive. If a dye precipitates inside the adhesive and becomes a crystal of about 1 to 10 μm, it may cause noise of optical recording / reproducing light during recording / reproducing.

It is preferable that the coloring material is uniformly mixed with the adhesive resin material. By dispersing the dye material in the resin, the reflectance of the optical recording / reproducing light beam is reduced, and the noise of the reflected light beam from the adhesive layer is also reduced.

The above dye material is required to be soluble in the molten adhesive resin. The content of the dye in the adhesive resin is 3 to 20% by weight, preferably 3 to 10% by weight. If it is less than 3% by weight, the effect of the light selective transmission layer is not exhibited, and if it exceeds 20% by weight, the adhesive strength of the adhesive resin to the protective substrate is reduced.

The adhesive is preferably one that does not adversely affect the optical recording layer, and the same adhesive as the adhesive described in the first aspect of the present invention is used. When the optical recording layer is made of a metal material, a reactive hot melt resin is preferred. When the optical recording layer is a dye material, a hot melt adhesive made of the copolymer described in the first aspect of the present invention is preferable.

In the method of containing the light selective transmissive substance in the adhesive, when the adhesive is a reactive hot melt resin, it is preferable that the adhesive is dispersed in the prepolymer before containing the isocyanate which is a reaction curing agent. Since the melt viscosity of the prepolymer is low, the dye material can be easily dissolved and dispersed in the resin in the kneading step.

On the other hand, when the adhesive is a hot melt resin,
The dye cannot be dispersed in the resin at room temperature because the resin has a high melt viscosity. Therefore, the adhesive resin is melted using a kneader ruder, and the dye is kneaded with the adhesive so that the adhesive can contain a dye exhibiting light selective transmittance.

In the optical recording medium of the present invention, a transparent substrate other than the above-mentioned adhesive layer, an optical recording layer, a reflective visible information layer, a concealing layer, a second visible information layer, an overcoat layer, a protective substrate, etc. Are the same as those described in the first invention.

Next, the optical recording medium of the third invention of the present invention comprises at least a transparent substrate, a visible light transmitting optical recording layer, a transparent protective substrate, a first visible information layer, a concealing layer and a second visible information layer. In an optical recording medium in which layers are stacked, the first visible information layer is made of a light reflective material, and the transparent protective substrate is made of a light selective transmissive material that transmits visible light and absorbs optical recording / reproducing light. It is characterized by containing.

FIG. 5 is a schematic sectional view showing an example of the optical recording medium according to the third invention of the present invention. The optical recording medium shown in the figure is configured as follows. First, the hard coat layer 1 is formed on the surface of the transparent substrate 2 on which the preformat pattern 9 is not formed, on which the preformat pattern is not formed, and the optical recording layer 3 is formed on the surface of the preformat pattern 9.
Is provided. On the other hand, a reflective visible information layer 6 is formed on one surface of a light-selective transparent protective substrate 73 containing a light-selective transparent material that transmits visible light and absorbs optical recording / reproducing light, and a concealing layer is formed thereon. 10, a second visible information layer 8 is further provided, and an overcoat layer 11 is provided thereon to form a protective substrate 16. The protective substrate 16 is bonded to the transparent substrate 2 on which the optical recording layer 3 is formed via a transparent adhesive layer 4 to obtain an optical recording medium.

As shown in FIG. 5, when the protective substrate is transparent, the reflective visible information layer is preferably provided on the surface of the transparent protective substrate opposite to the optical recording layer. The reason is that the distance between the reflective visible information layer and the optical recording layer is increased, and the amount of reflected recording / reproducing light from the reflective visible information layer is less likely to enter the detection system of the recording / reproducing apparatus. The reflective visible information layer is visually observed from the hard coat surface via the optical recording layer.

[0098] The third invention of the present invention relates to a transparent protection substrate comprising:
It is characterized by comprising a light-selective transparent protective substrate containing a light-selective transparent material that transmits visible light and absorbs optical recording / reproducing light.

As the light selective transmission material, the same coloring material as the material described in the first invention is used. Further, it is desired that the dye crystals do not precipitate inside the transparent resin of the transparent protective substrate. If a dye precipitates inside the transparent resin to form a crystal of about 1 to 10 μm, it may cause noise in optical recording / reproducing light during recording / reproducing.

It is preferable that the coloring material is uniformly mixed with the transparent resin material. By dispersing the pigment material in the resin,
There is also an effect that the reflectance of the optical recording / reproducing light beam becomes smaller than that of the film of the dye alone, and the noise of the reflected light beam from the transparent protective substrate becomes smaller.

The above dye material is required to be soluble in the molten transparent protective substrate resin. The content of the pigment in the resin is 3 to 20% by weight, preferably 3 to 10% by weight. If it is less than 3% by weight, the effect of the light selective transmission layer is not exhibited, and if it exceeds 20% by weight, the mechanical strength such as the bending strength of the transparent protective substrate decreases.

Further, when the transparent protective substrate is formed into a sheet by melt extrusion, the thermal decomposition temperature of the dye is preferably equal to or higher than the melting point of the transparent protective substrate. This is because the dye is mixed into the molten state of the resin in order to dissolve and disperse the dye in the resin.

The method of containing the light selective transmissive substance in the transparent protective substrate is as follows. When the transparent protective substrate is a melt extruded resin such as polycarbonate or vinyl chloride resin, the dye is dispersed in the resin at room temperature because the resin has a high melt viscosity. Can not. Therefore, the transparent resin is melted using a kneader-ruder, and a dye is kneaded with the transparent resin, so that the transparent resin contains a dye exhibiting light-selective transmittance, thereby obtaining a light-selective-transparent protective substrate.

When the transparent protective substrate is made by casting a monomer such as an acrylic resin, a light selective transmissive protective substrate can be obtained by dissolving and casting a light selective transmissive dye in a prepolymer or a monomer.

Further, in the optical recording medium of the present invention, a transparent substrate other than the above-mentioned light selective transmission protective substrate, an optical recording layer, a reflective visible information layer, a concealing layer, a second visible information layer, an overcoat layer, The same adhesive layer as that described in the first invention is used.

The transparent protective substrate containing the light selective transmission material has a transmittance of 60 to 400 nm for light having a wavelength of 400 to 700 nm.
% And a transmittance of light having a wavelength of 700 to 900 nm is preferably 60% or less.

[0107]

EXAMPLES The present invention will be specifically described below with reference to examples.

Examples 1 to 6 below show examples of the first invention of the present invention.

Example 1 An optical recording medium shown in FIG. 1 was prepared. A hard coat layer made of an ultraviolet curable resin is formed on the surface of the polycarbonate substrate having a thickness of 400 μm on which the preformat layer is formed and on which the preformat is not formed. A recording layer was provided. The visible light transmittance of the dye recording layer is 500 wavelengths.
It was 40% or more in nm.

[0110]

Embedded image

Next, a light selective transmission layer having a thickness of 6 μm was formed on one surface of a transparent polycarbonate having a thickness of 250 μm.

The composition of the formed light selective transmission layer is as follows: 80 parts by weight, manufactured by Teikoku Ink Mfg. Co., Ltd. (Sericol EGS Medium) 10 parts by weight, IRG-008 (aminium salt compound) manufactured by Nippon Kayaku Thinning solvent (G002 manufactured by Teikoku Ink) Solvent) 10 parts by weight. The light transmittance of the obtained light selective transmission layer at a wavelength of 500 nm was 85%. The light transmittance at a wavelength of 830 nm was 50%.

After the light selective transmission layer was dried at 60 ° C. for 30 minutes, a golden reflective visible information layer was formed on the light selective transmission layer. The composition of the gold visible information layer is 75 parts by weight of Teikoku Ink Mfg. Co., Ltd. (Sericol EGS Medium) 15 parts by weight of Gold 602 manufactured by Seiko Advance Co., Ltd. 10 parts by weight of a diluting solvent (G002 solvent manufactured by Teikoku Ink).

Next, a white concealing layer was provided with a thickness of 15 μm, a second visible information layer was further provided, and a transparent sheet made of a hard vinyl chloride resin having a thickness of 50 μm was laminated. Hot pressing was performed to produce a protective substrate.

The protective substrate is made of a transparent adhesive (Kurashiki Boseki Co., Ltd.)
O-4151) and a transparent substrate on which an optical recording layer was formed to obtain an optical card having a light selective transmission layer as shown in FIG.

Since the visible information layer observable through the optical recording layer is formed of a reflective material, the quality of the visible information is improved. Further, the reflection noise of the recording / reproducing light beam from the reflective visible information layer is 75% as compared with the case where the light selective transmission layer is not provided.
The AT decreased during recording and reproduction.

Example 2 The light selective transmission layer of Example 1 was formed as follows. The composition of the formed light selective transmission layer is 77 parts by weight by Teikoku Ink Mfg. Co., Ltd. (Sericol EGS Medium) IRG-026 (diimonium salt compound) by Nippon Kayaku 13 parts by weight Thinning solvent (G002 solvent by Teikoku Ink) 10 Parts by weight.

The light transmittance of the obtained light selective transmission layer at a wavelength of 500 nm was 85%. The light transmittance at a wavelength of 830 nm was 55%. An optical card having a light selective transmission layer as shown in FIG. 1 was obtained in the same manner as in Example 1.

Since the visible information layer that can be observed through the optical recording layer is formed of a reflective material, the quality of the visible information is improved. Further, the reflection noise of the recording / reproducing light beam from the reflective visible information layer is reduced by 70
%, And no AT deviation during recording / reproduction was observed.

Example 3 The light selective transmission layer of Example 1 was formed as follows. The composition of the formed light selective transmission layer is 87 parts by weight from Teikoku Ink Mfg. Co., Ltd. (Sericol EGS medium) 3 parts by weight soluble phthalocyanine dye IR-1 (Nippon Shokubai Co., Ltd.) 3 parts by weight Thinner solvent (G002 solvent from Teikoku Ink Corporation) 10 Parts by weight.

The light transmittance of the obtained light selective transmission layer at a wavelength of 500 nm was 80%. The light transmittance at a wavelength of 830 nm was 50%. An optical card having a light selective transmission layer as shown in FIG. 1 was obtained in the same manner as in Example 1.

Since the visible information layer observable through the optical recording layer is formed of a reflective material, the quality of the visible information is improved. Further, the reflection noise of the recording / reproducing light beam from the reflective visible information layer is 75
%, And no AT deviation during recording / reproduction was observed.

Example 4 A hard coat layer made of an ultraviolet curable resin is formed on a surface of a polycarbonate substrate having a thickness of 400 μm on which a preformat layer is formed and on which no preformat is formed, and a tellurium oxide is formed on the preformat surface. An optical recording layer having a thickness of 400 ° was provided. The visible light transmittance of tellurium oxide was 10% or more at a wavelength of 500 nm.

Next, a light selective transmission layer having a thickness of 6 μm was formed on one surface of a transparent polycarbonate having a thickness of 250 μm.

The composition of the formed light selective transmission layer is as follows: 80 parts by weight, manufactured by Teikoku Ink Manufacturing Co., Ltd. (Sericol EGS Medium) 10 parts by weight, IRG-008 (aminium salt compound) manufactured by Nippon Kayaku Thinning solvent (G002 manufactured by Teikoku Ink) Solvent) 10 parts by weight. The light transmittance of the obtained light selective transmission layer at a wavelength of 500 nm was 85%. The light transmittance at a wavelength of 830 nm was 50%.

After the light selective transmission layer was dried at 60 ° C. for 30 minutes, a gold reflective visible information layer was formed on the light selective transmission layer.

The composition of the golden visible information layer is 75 parts by weight, manufactured by Teikoku Ink Manufacturing Co., Ltd. (Sericol EGS Medium) 15 parts by weight of Gold 602, manufactured by Seiko Advance Co., Ltd. 10 parts by weight of a diluting solvent (G002 solvent manufactured by Teikoku Ink) is there.

Next, a white concealing layer was provided with a thickness of 15 μm, a second visible information layer was further provided, a transparent sheet made of hard vinyl chloride having a thickness of 50 μm was laminated, and the transparent protective substrate was heated at a temperature of 120 ° C. For 5 minutes to form a protective substrate.

The protective substrate is made of a transparent adhesive (Kurashiki Boseki Co., Ltd.)
O-4120) and a transparent substrate having an optical recording layer formed thereon to obtain an optical card having a light selective transmission layer as shown in FIG.

Since the visible information layer observable through the optical recording layer is formed of a reflective material, the quality of the visible information is improved. Further, the reflection noise of the recording / reproducing light beam from the reflective visible information layer is 75
%, And no AT deviation during recording / reproduction was observed.

Example 5 A silver reflective visible information layer was formed by changing the reflective visible information layer of Example 1 to the following materials. The composition of the formed silver visible information layer is 73 parts by weight from Teikoku Ink Mfg. Co., Ltd. (Sericol EGS Medium) 20 parts by weight from silver 606H from Seiko Advance Co., Ltd. 7 parts by weight from a dilute solvent (G002 solvent from Teikoku Ink) is there.

The protective substrate was bonded with a transparent substrate having an optical recording layer formed thereon via a transparent adhesive to obtain an optical card having a light selective transmission layer as shown in FIG.

Since the visible information layer that can be observed through the optical recording layer is formed of a reflective material, the quality of the visible information is improved. Further, the reflection noise of the recording / reproducing light beam from the reflective visible information layer is 75
%, And no AT deviation during recording / reproduction was observed.

Example 6 An optical recording medium shown in FIG. 2 was prepared. A hard coat layer made of an ultraviolet curable resin is formed on the surface of the polycarbonate substrate having a thickness of 400 μm on which the preformat layer is formed and on which the preformat is not formed. A recording layer was provided. The visible light transmittance of the dye recording layer is 500 wavelengths.
It was 40% or more in nm.

[0135]

Embedded image

Next, a silver visible information layer was formed on one surface of an opaque white vinyl chloride resin substrate having a thickness of 250 μm.

The composition of the silver visible information layer was 73 parts by weight, manufactured by Teikoku Ink Manufacturing Co., Ltd. (Sericol EGS Medium); 20 parts by weight, silver 606H manufactured by Seiko Advance Co., Ltd .; is there.

A light selective transmission layer having a thickness of 6 μm was formed on the visible information layer.
m. The composition of the formed light selective transmission layer is 80 parts by weight by Teikoku Ink Mfg. Co., Ltd. (Sericol EGS Medium) IRG-008 (aminium salt compound) by Nippon Kayaku 10 parts by weight Thinning solvent (G002 solvent by Teikoku Ink) 10 Parts by weight.

The light transmittance of the obtained light selective transmission layer at a wavelength of 500 nm was 85%. The light transmittance at a wavelength of 830 nm was 50%.

Further, a second visible information layer was provided on the other surface, and an adhesive having a thickness of 50 μm (O-Cur
4120), a transparent sheet made of hard vinyl chloride was laminated to form a protective substrate. The protective substrate was bonded to a transparent substrate having an optical recording layer formed thereon via a transparent adhesive to obtain an optical card having a light selective transmission layer as shown in FIG.

Since the visible information layer that can be observed through the optical recording layer is formed of a reflective material, the quality of the visible information is improved. Further, the reflection noise of the recording / reproducing light beam from the reflective visible information layer is 75
%, And no AT deviation during recording / reproduction was observed.

Next, examples 7 to 11 below show examples of the second invention of the present invention.

Example 7 An optical recording medium shown in FIG. 3 was prepared. A hard coat layer made of an ultraviolet curable resin is formed on the surface of the 400 μm-thick polycarbonate substrate on which the preformat layer is formed, on which the preformat is not formed, and a dye (Nippon Kayaku, IR820) is formed on the preformat surface An optical recording layer having a thickness of 1000 ° was provided. The visible light transmittance of the optical recording layer was 40% or more at a wavelength of 500 nm.

Next, a gold reflective visible information layer was formed on one surface of a transparent polycarbonate having a thickness of 250 μm.
The composition of the gold visible information layer is 75 parts by weight, manufactured by Teikoku Ink Manufacturing Co., Ltd. (Sericol ESS Medium), 15 parts by weight of gold pigment, 15 parts by weight of Gold 602, manufactured by Seiko Advance Co., Ltd., 10 parts by weight of a diluting solvent (G002 solvent manufactured by Teikoku Ink Corporation).

Next, a white concealing layer was provided with a thickness of 15 μm, a second visible information layer was further provided, a transparent sheet made of hard vinyl chloride having a thickness of 50 μm was laminated, and heated at a temperature of 120 ° C. for 5 minutes. It pressed and produced the protection substrate.

Next, an adhesive containing a light selective transmissive substance was produced by the following method. In order to prepare an adhesive containing a light selective transmissive substance, a hot melt adhesive manufactured by Kurashiki Boseki Co., Ltd .; an adhesive resin in a kneader ruder when extruding Cranbetter part number O-4121 into a sheet. Is heated to 160 ° C., and in the resin melted by heating, IRG-008 (aminium salt) manufactured by Nippon Kayaku Co., Ltd.
Was added and kneaded with an adhesive resin, and then an adhesive sheet having a thickness of 50 μm was prepared by a melt extrusion method.

The visible light transmittance at a wavelength of 500 nm of the prepared adhesive sheet containing the light selective transmissive substance was 80% or more. On the other hand, the transmittance of an optical recording / reproducing light beam having a wavelength of 830 nm was 40%.

Next, the above-mentioned protective substrate is bonded to a transparent substrate having an optical recording layer formed thereon via an adhesive sheet containing a transparent light-selective and transparent substance, and an optical card as shown in FIG. Obtained.

Since the visible information layer that can be observed through the optical recording layer is formed of a reflective material, the quality of the visible information has been improved. Further, the reflection noise of the recording / reproducing light beam from the reflective visible information layer was reduced by 80% or more as compared with the case where the adhesive layer did not contain a light selective transmissive substance, and no AT deviation during recording / reproduction was observed. .

Example 8 As shown in FIG. 3, as in Example 7, except that the light selective permeable substance of Example 7 was changed to 13 parts by weight of IRG-026 (a diimmonium salt compound) manufactured by Nippon Kayaku Co., Ltd. An optical card using an adhesive sheet containing a light selective transmissive substance was obtained.

Since the visible information layer that can be observed through the optical recording layer is formed of a reflective material, the quality of the visible information has been improved. Further, the reflection noise of the recording / reproducing light beam from the reflective visible information layer was reduced by 70% as compared with the case where the adhesive layer did not contain a light selective transmissive substance, and no AT deviation during recording / reproduction was observed.

Example 9 An adhesive sheet containing a light selective permeable substance was prepared by changing the light selective permeable substance of Example 7 to 3 parts by weight of a soluble phthalocyanine dye IR-1 (manufactured by Nippon Shokubai).

The visible light transmittance at a wavelength of 500 nm of the adhesive sheet containing the prepared light selective transmission material was 75% or more. On the other hand, the transmittance of an optical recording / reproducing light beam having a wavelength of 830 nm was 30%.

An optical card as shown in FIG. 3 was obtained in the same manner as in Example 7 by using the above-mentioned adhesive sheet containing the light selective transmissive substance.

Since the visible information layer that can be observed through the optical recording layer is formed of a reflective material, the quality of the visible information has been improved. Further, the reflection noise of the recording / reproducing light beam from the reflective visible information layer was reduced by 90% as compared with the case where the adhesive layer did not contain a light selective transmissive substance, and no AT deviation during recording / reproduction was observed.

Embodiment 10 A 400 μm-thick preformatted pattern was formed.
A hard coat layer made of an ultraviolet curable resin was formed on the surface of the polycarbonate substrate having no preformat formed thereon, and an optical recording layer made of tellurium oxide having a thickness of 400 ° was provided on the surface of the preformat. The visible light transmittance of tellurium oxide was 10% or more at a wavelength of 500 nm.

An optical card using an adhesive sheet containing a light selective transmissive substance as shown in FIG. 3 was obtained in the same manner as in Example 7, except that the above-mentioned optical recording layer made of tellurium oxide was used. .

Since the visible information layer that can be observed through the optical recording layer is formed of a reflective material, the quality of the visible information has been improved. Further, the reflection noise of the recording / reproducing light beam from the reflective visible information layer was reduced by 75% as compared with the case where the adhesive layer did not contain a light selective transmissive substance, and no AT deviation during recording / reproduction was observed.

Example 11 The reflective visible information layer of Example 7 was changed to the following material to form a silver reflective visible information layer. The composition of the silver color visible information layer is 73 parts by weight of a superimposed portion of silver pigment; 20 parts by weight of silver 606H manufactured by Seiko Advance Co., Ltd., 7 parts by weight of a diluting solvent (G002 solvent manufactured by Teikoku Ink Co., Ltd.) manufactured by Teikoku Ink Mfg. Co., Ltd.

An optical card as shown in FIG. 3 was obtained in the same manner as in Example 7 except that the above-mentioned reflective visible information layer was used.

Since the visible information layer that can be observed through the optical recording layer is formed of a reflective material, the quality of the visible information has been improved. Further, the reflection noise of the recording / reproducing light beam from the reflective visible information layer was reduced by 75% as compared with the case where the adhesive layer did not contain a light selective transmissive substance, and no AT deviation during recording / reproduction was observed.

Example 12 An optical recording medium shown in FIG. 4 was produced. A hard coat layer made of an ultraviolet curable resin is formed on a surface of a polycarbonate substrate having a thickness of 400 μm on which a preformat pattern is formed and on which the preformat is not formed, and a thickness of 1000 mm made of the following dye is formed on the surface of the preformat. Was provided. The visible light transmittance of the optical recording layer is 5 wavelengths.
It was 40% or more at 00 nm.

[0163]

Embedded image

Next, a silver visible information layer was formed on one surface of opaque white vinyl chloride having a thickness of 250 μm. The composition of the silver visible information layer is 73 parts by weight, manufactured by Teikoku Ink Manufacturing Co., Ltd. (Sericol EGS Medium); 20 parts by weight, silver 606H manufactured by Seiko Advance Co., Ltd .; 7 parts by weight of a diluting solvent (G002 solvent, manufactured by Teikoku Ink Co., Ltd.).

Further, a second visible information layer was provided on the other surface, a transparent sheet made of hard vinyl chloride having a thickness of 50 μm0 was laminated, and hot-pressed at a temperature of 120 ° C. for 5 minutes to form a protective substrate.

Next, the above-mentioned protective substrate was bonded to a transparent substrate on which an optical recording layer was formed via an adhesive sheet containing the same transparent and light-transmitting substance as in Example 1, as shown in FIG. Got such a light card.

Since the visible information layer that can be observed through the optical recording layer is formed of a reflective material, the quality of the visible information has been improved. Further, the reflection noise of the recording / reproducing light beam from the reflective visible information layer was reduced by 75% or more as compared with the case where the adhesive layer did not contain a light selective transmissive substance, and AT deviation during recording / reproduction was not recognized. .

Next, examples 13 to 17 of the present invention show examples of the third invention of the present invention.

Example 13 An optical recording medium shown in FIG. 5 was prepared. Thickness 400 on which preformat pattern is formed by roller grooving method
A hard coat layer made of an ultraviolet curable resin is formed on the surface of the μm polycarbonate substrate on which the preformat is not formed, and an optical recording layer having a thickness of 1000 mm made of a dye (IR820 manufactured by Nippon Kayaku) is provided on the preformat surface Was. The visible light transmittance of the optical recording layer was 40% or more at a wavelength of 500 nm.

Next, a light-selective and transparent protective substrate was prepared by the following method. Idemitsu Chemical's polycarbonate pellets (melting point: 270 ° C) were placed in a kneader-ruder at 280 ° C.
And 5% by weight of IRG-026 manufactured by Nippon Kayaku Co., Ltd. (diimmonium salt, pyrolysis temperature: 300 ° C.) was added, kneaded with the resin, and then 250 μm thick by a melt extrusion method.
Was produced. The produced protective substrate sheet containing the light selective transmissive substance has a wavelength of 50
The visible light transmittance at 0 nm was 80% or more. On the other hand, the transmittance of an optical recording / reproducing light beam having a wavelength of 830 nm was 40%.

Next, a gold reflective visible information layer was formed on one surface of the above-mentioned 250 μm thick light-selective transparent protective substrate (made of polycarbonate). The composition of the golden reflective visible information layer is 75 parts by weight, manufactured by Teikoku Ink Manufacturing Co., Ltd. (Sericol EGS Medium) 15 parts by weight of Gold 602 manufactured by Seiko Advance Co., Ltd. 10 parts by weight of a diluting solvent (G002 solvent manufactured by Teikoku Ink Co., Ltd.) .

Next, a white opaque layer was provided with a thickness of 15 μm, a second visible information layer was further provided, a transparent sheet made of hard vinyl chloride having a thickness of 50 μm was laminated, and heated at 120 ° C. for 5 minutes. It pressed and produced the protection substrate.

Next, the protective substrate was bonded with a transparent substrate having an optical recording layer formed thereon via a transparent adhesive to obtain an optical card as shown in FIG.

Since the visible information layer that can be observed through the optical recording layer is formed of a reflective material, the quality of the visible information has been improved. Further, the reflection noise of the recording / reproducing light beam from the reflective visible information layer was reduced by 80% or more as compared with the case where the light selective transmissive substance was not contained in the protective substrate, and AT deviation during recording / reproducing was not recognized.

Example 14 The light selective permeable substance of Example 13 was subjected to a thermal decomposition temperature of 300 ° C.
A protective substrate sheet containing a light selective transmissive substance as shown in FIG. 5 as in Example 13 except that the above-mentioned Nippon Shokubai Co., Ltd. changed to 5 parts by weight of EEX Color IR-2 (phthalocyanine compound). The used optical card was obtained.

Since the visible information layer that can be observed through the optical recording layer is formed of a reflective material, the quality of the visible information has been improved. Further, the reflection noise of the recording / reproducing light beam from the reflective visible information layer was reduced by 70% as compared with the case where the light selective transmissive substance was not contained in the protective substrate, and AT deviation during recording / reproducing was not recognized.

Example 15 The light selective transmission material of Example 13 was subjected to a thermal decomposition temperature of 350 ° C.
An optical card using a protective substrate sheet containing a light selective transmissive substance as shown in FIG. 5 in the same manner as in Example 13 except that the soluble phthalocyanine dye IR-3 (manufactured by Nippon Shokubai) was changed to 5 parts by weight. Obtained.

Since the visible information layer that can be observed through the optical recording layer is formed of a reflective material, the quality of the visible information has been improved. Further, the reflection noise of the recording / reproducing light beam from the reflective visible information layer was reduced by 90% as compared with a case where the protective substrate did not contain a light selective transmissive substance, and no AT deviation during recording / reproduction was observed.

Example 16 Thickness of 400 μm with Preformatted Pattern Formed
A hard coat layer made of an ultraviolet curable resin was formed on the surface of the polycarbonate substrate on which no preformat was formed, and an optical recording layer of tellurium oxide having a thickness of 400 ° was provided on the surface of the preformat. The visible light transmittance of tellurium oxide was 10% or more at a wavelength of 500 nm.

An optical card using a protective substrate sheet containing a light selective transmissive substance as shown in FIG. 5 was obtained in the same manner as in Example 13 except that the above-mentioned optical recording layer made of tellurium oxide was used.

Since the visible information layer that can be observed through the optical recording layer is formed of a reflective material, the quality of the visible information has been improved. Further, the reflection noise of the recording / reproducing light beam from the reflective visible information layer was reduced by 75% as compared with the case where the light selective transmissive substance was not contained in the protective substrate, and no AT deviation during recording / reproducing was observed.

Example 17 A silver reflective visible information layer was formed by changing the reflective visible information layer of Example 13 to the following materials. The composition of the silver visible information layer is 73 parts by weight, manufactured by Teikoku Ink Manufacturing Co., Ltd. (Sericol EGS Medium); 20 parts by weight, silver 606H manufactured by Seiko Advance Co., Ltd .; 7 parts by weight of a diluting solvent (G002 solvent, manufactured by Teikoku Ink Co., Ltd.).

Otherwise, as in Example 13, an optical card using a protective substrate sheet containing a light selective transmissive substance as shown in FIG. 5 was obtained.

Since the visible information layer that can be observed through the optical recording layer is formed of a reflective material, the quality of the visible information has been improved. Further, the reflection noise of the recording / reproducing light beam from the reflective visible information layer was reduced by 75% as compared with the case where the light selective transmissive substance was not contained in the protective substrate, and no AT deviation during recording / reproducing was observed.

[0185]

As described above, in the optical recording medium having the light selective transmission layer according to the first aspect of the present invention, the visible information layer observable through the optical recording layer is formed of a reflective material. Therefore, the quality of the visible information is improved, and the reflection noise of the recording / reproducing light beam from the reflective visible information layer is reduced by 70% or more as compared with the case where the light selective transmission layer is not provided.
Departure is no longer recognized.

In the optical recording medium having the adhesive layer containing the light selective transmissive substance according to the second aspect of the present invention, the visible information layer observable through the optical recording layer is formed of a reflective material. In addition, the quality of the visible information is improved, and the reflection noise of the recording / reproducing light beam from the reflective visible information layer is reduced by 7 times as compared with the case where the adhesive layer is made of a transparent material containing no light selective transmission material.
It was reduced by 0% or more, and AT deviation during recording / reproduction was not recognized.

In the optical recording medium having the protective substrate containing the light selective transmissive substance according to the third aspect of the present invention, the visible information layer observable through the optical recording layer is formed of a reflective material. The quality of the visible information is improved, and the reflection noise of the recording / reproducing light beam from the reflective visible information layer is reduced by 7 times as compared with the case where the protective substrate is made of a transparent material containing no light selective transmissive substance.
It was reduced by 0% or more, and AT deviation during recording / reproduction was not recognized.

Further, since the light selective transmissive substance is directly contained in the protective substrate, the light selective transmissive substance is not formed by the solvent coating method, so that the residual solvent in the card is reduced and the storage durability of the optical recording layer is reduced. Improved. Since the solvent coating method is not used, the chemical adverse effect on the card manufacturing operator due to the solvent is reduced, and the productivity is improved.

Further, according to the first to third aspects of the present invention, it has become possible to use a reflective material for a visible information layer which can be observed through an optical recording layer. The restrictions on the color of the visible information layer have been eliminated, and the choice of card design has been improved. In particular, when the protective substrate is made of an opaque material, the distance between the optical recording layer and the reflective visible information layer becomes longer, and the reflection noise of the reflective visible information layer hardly enters the light detection system of the optical recording / reproducing apparatus.
The phenomenon of deviating from T was further improved.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of an optical recording medium according to the first invention of the present invention.

FIG. 2 is a schematic sectional view showing another example of the optical recording medium of the first invention of the present invention.

FIG. 3 is a schematic sectional view showing an example of the optical recording medium according to the second invention of the present invention.

FIG. 4 is a schematic sectional view showing another example of the optical recording medium according to the second invention of the present invention.

FIG. 5 is a schematic sectional view showing an example of the optical recording medium according to the third invention of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hard-coat layer 2 Transparent substrate 3 Optical recording layer 4 Adhesive layer 44 Adhesive layer containing light selective transmission material 5 Light selective transmission layer 6 Reflective visible information layer 70 Opaque protective substrate 71 Transparent protective substrate 73 Light selective transparent protective substrate Reference Signs List 8 second visible information layer 9 preformat pattern 10 concealment layer 11 overcoat layer 12, 13, 14, 15, 16 protective substrate

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 7/26 531 C09B 23/00 J 5D121 // C09B 23/00 G06K 19/00 C F term (Reference) 2C005 HA30 HB01 JA12 KA02 KA06 KA31 KA48 4H056 CA01 CC06 CC08 CE01 CE02 FA06 5B035 BA03 BA05 BB03 5D029 HA04 JA04 JB02 JB09 JB14 JB32. EE27 FF01

Claims (18)

[Claims] 1. An optical recording medium comprising at least a transparent substrate, a visible light transmitting optical recording layer, and a visible information layer laminated, wherein the visible information layer is made of a light reflective material, and the visible light transmitting optical recording is performed. An optical recording medium comprising a light selective transmission layer containing a light selective transmission material that transmits visible light and absorbs optical recording / reproducing light, between the layer and the visible information layer. 2. The light selective transmission layer according to claim 1, wherein a transmittance of light having a wavelength of 400 to 700 nm is 60% or more, and 700 to 900.
2. The optical recording medium according to claim 1, wherein the transmittance of light having a wavelength of nm is 60% or less. 3. The optical recording medium according to claim 1, wherein the reflectance of the light selective transmission layer at a wavelength of 700 to 900 nm is 10% or less. 4. The optical recording medium according to claim 1, wherein said light selective transmission material contains at least an aminium salt compound represented by the following general formula (I). Embedded image (Wherein, R _{1 to} R ₈ represent a substituted or terminally substituted alkyl group having 1 to 8 carbon atoms, a substituted or terminally substituted alkenyl group, a substituted or terminally substituted aralkyl group, or a substituted or terminally substituted alkynyl group. R ₁ and R ₂ , R ₃
And R ₄ , R ₅ and R ₆ and R ₇ and R ₈ together with N to form a substituted or terminally substituted 5-membered ring, a substituted or terminally substituted 6-membered ring, a substituted or terminally substituted 7-membered ring Is also good. The substituents of R _{1 to} R ₈ may be the same or different. X ^- represents an anion. ) 5. The optical recording medium according to claim 1, wherein the light selective transmission material contains at least a diimmonium salt compound represented by the following general formula (II). Embedded image (Wherein, R _{1 to} R ₈ represent a substituted or terminally substituted alkyl group having 1 to 8 carbon atoms, a substituted or terminally substituted alkenyl group, a substituted or terminally substituted aralkyl group, or a substituted or terminally substituted alkynyl group. R ₁ and R ₂ , R ₃
And R ₄ , R ₅ and R ₆ and R ₇ and R ₈ together with N to form a substituted or terminally substituted 5-membered ring, a substituted or terminally substituted 6-membered ring, a substituted or terminally substituted 7-membered ring Is also good. The substituents of R _{1 to} R ₈ may be the same or different. X ^- represents an anion. ) 6. The optical recording medium according to claim 1, wherein the light selective transmission material contains at least a solvent-soluble phthalocyanine compound. 7. An optical recording medium having at least a transparent substrate, a visible light transmitting optical recording layer, an adhesive layer and a visible information layer laminated, wherein the visible information layer is made of a light reflective material, and the adhesive An optical recording medium, characterized in that the layer contains a light selective transmissive material that transmits visible light and absorbs optical recording / reproducing light. 8. The adhesive layer containing the light selective transmissive material has a transmittance of light having a wavelength of 400 to 700 nm of 60% or more and a transmittance of light having a wavelength of 700 to 900 nm of 60 or more.
%. 9. The optical recording medium according to claim 7, wherein the adhesive layer containing the light selective transmission material has a reflectance of 10% or less at a wavelength of 700 to 900 nm. 10. The optical recording medium according to claim 7, wherein said light selective transmission material contains at least an aminium salt compound represented by the following general formula (I). Embedded image (Wherein, R _{1 to} R ₈ represent a substituted or terminally substituted alkyl group having 1 to 8 carbon atoms, a substituted or terminally substituted alkenyl group, a substituted or terminally substituted aralkyl group, or a substituted or terminally substituted alkynyl group. R ₁ and R ₂ , R ₃
And R ₄ , R ₅ and R ₆ and R ₇ and R ₈ together with N to form a substituted or terminally substituted 5-membered ring, a substituted or terminally substituted 6-membered ring, a substituted or terminally substituted 7-membered ring Is also good. The substituents of R _{1 to} R ₈ may be the same or different. X ^- represents an anion. ) 11. The optical recording medium according to claim 7, wherein said light selective transmission material contains at least a diimonium salt compound represented by the following general formula (II). Embedded image (In the formula, R _{1 to} R ₈ represent a substituted or terminally substituted alkyl group having 1 to 8 carbon atoms, a substituted or terminally substituted alkenyl group, a substituted or terminally substituted aralkyl group, or a substituted or terminally substituted alkynyl group. R ₁ and R ₂ , R ₃
And R ₄ , R ₅ and R ₆ and R ₇ and R ₈ together with N to form a substituted or terminally substituted 5-membered ring, a substituted or terminally substituted 6-membered ring, a substituted or terminally substituted 7-membered ring Is also good. The substituents of R _{1 to} R ₈ may be the same or different. X ^- represents an anion. ) 12. The optical recording medium according to claim 7, wherein said light selective transmission material contains at least a solvent-soluble phthalocyanine compound. 13. An optical recording medium comprising at least a transparent substrate, a visible light transmitting optical recording layer, a transparent protective substrate, a first visible information layer, a concealing layer and a second visible information layer laminated on each other. An optical recording medium, wherein the visible information layer is made of a light-reflective material, and the transparent protective substrate contains a light selective transmissive material that transmits visible light and absorbs optical recording / reproducing light. 14. The transparent protective substrate containing the light selective transmissive material has a transmittance of light having a wavelength of 400 to 700 nm of 60.
The optical recording medium according to claim 13, wherein the transmittance of light having a wavelength of 700 to 900 nm is 60% or less. 15. The light according to claim 13, wherein the transparent protective substrate is made of a resin, and a thermal decomposition temperature of the light selective transmissive material contained in the transparent protective substrate is higher than a melting point of the resin of the transparent protective substrate. recoding media. 16. The optical recording medium according to claim 13, wherein said light selective transmission material contains at least an aminium salt compound represented by the following general formula (I). Embedded image (Wherein, R _{1 to} R ₈ represent a substituted or terminally substituted alkyl group having 1 to 8 carbon atoms, a substituted or terminally substituted alkenyl group, a substituted or terminally substituted aralkyl group, or a substituted or terminally substituted alkynyl group. R ₁ and R ₂ , R ₃
And R ₄ , R ₅ and R ₆ and R ₇ and R ₈ together with N to form a substituted or terminally substituted 5-membered ring, a substituted or terminally substituted 6-membered ring, a substituted or terminally substituted 7-membered ring Is also good. The substituents of R _{1 to} R ₈ may be the same or different. X ^- represents an anion. ) 17. The optical recording medium according to claim 13, wherein said light selective transmission material contains at least a diimonium salt compound represented by the following general formula (II). Embedded image (Wherein, R _{1 to} R ₈ represent a substituted or terminally substituted alkyl group having 1 to 8 carbon atoms, a substituted or terminally substituted alkenyl group, a substituted or terminally substituted aralkyl group, or a substituted or terminally substituted alkynyl group. R ₁ and R ₂ , R ₃
And R ₄ , R ₅ and R ₆ and R ₇ and R ₈ together with N to form a substituted or terminally substituted 5-membered ring, a substituted or terminally substituted 6-membered ring, a substituted or terminally substituted 7-membered ring Is also good. The substituents of R _{1 to} R ₈ may be the same or different. X ^- represents an anion. ) 18. The optical recording medium according to claim 13, wherein the light selective transmission material contains at least a solvent-soluble phthalocyanine compound.