JPH08161770A - Optical card-shaped recording medium - Google Patents

Abstract

PURPOSE: To obtain an optical card-shaped recording medium by which the reliability of a recording and reproducing operation is enhanced by a method wherein, after a protective base material which is laminated on a recording layer via an adhesion layer has been molded thermally, its warp amount is reduced and the mutual deviation of the formation position of an optical recording layer from a magnetic recording layer is made small. CONSTITUTION: In a card-shaped recording medium, a protective base material 9 which is laminated on a recording layer 2 via an adhesion layer 3 is composed of at least three layers, i.e., an A-layer, a B-layer and a C-layer, and the layers are formed sequentially toward the outside from the inside. In the optical recording medium, the warp amount of the protective base material 9 can be reduced by changing the thickness of the A-layer and the C-layer. The A-layer, the B-layer and the C-layer respectively indicate an innermost-layer overcoat 51, a protective substrate and an outermost-layer overcoat 52 in the protective base material 9, and they are formed in this order from the inside toward the outside so as to constitute the protective base material 9. In the protective base material 9, a warp is small, and the alignment accuracy of a pregrouped substrate with the protective base material 9 is increased in the lamination process of the pregrouped substrate on which the recording layer has been formed at a time when an optical card is manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides an optical card medium which is inexpensive and has little change in durability during storage.

[0002]

2. Description of the Related Art In recent years, card-shaped optical recording media have been commercialized as optical cards. As with conventional credit cards, bank cards, etc., it is essential for an optical card to record a personal database when used. In this case, the record is played back with a code that can be understood only by an individual, but the user is not limited to the owner of the optical card. For example, when a doctor, staff of various financial institutions, etc. also use it. There is. Therefore, it is desired that common information including personal information of the card holder or notes of the optical card system issuer be written as visible information on the card. Generally, personal information is individually printed on an optical card using a thermal transfer printer. The common information is provided on the card surface by screen, offset, gravure printing, or the like.

FIG. 4 schematically shows a cross section of a conventional optical card. In FIG. 4- (a), an overcoat layer 5 is provided to protect the printed common information 8. In many cases, the overcoat layer also serves as a print receiving layer for the personal information 10. The surface of the overcoat layer is
It must be smooth enough to increase the printing accuracy of personal information transferred by heat, and usually has an average roughness Ra = 0.2 μm.
It is processed into a mirror surface by a mirror surface heat press or the like so as to have the following accuracy. Alternatively, an overcoat having a mirror surface can be obtained by laminating mirror-finished sheets.

Further, a magnetic stripe 12 is provided on the overcoat layer if necessary.

[0005]

In order to process the overcoat layer so as to have a mirror surface property or to add a magnetic stripe onto the overcoat layer, hot pressing is used. Therefore, it is difficult to perform in the optical card state. This is because in the optical card state, heat (120 to 180 ° C.) during hot pressing causes damage to the optical recording layer 2 and the preformatted substrate 1. Therefore, in the normal optical card recording medium, the common information 8 is printed on the protective substrate 4, and the protective base material 9 having the overcoat 5 provided on the printing surface by a mirror surface heat press or the like is placed on the recording layer via the adhesive layer 3. It is obtained by cutting into a card size after stacking.

In such a conventional optical card manufacturing method, since the protective base material 9 has an asymmetric structure as shown in FIG. 4- (b), "warpage" occurs after the mirror surface hot press molding. Due to the warpage of the protective base material, there arises a problem that a positional deviation occurs during lamination with the pre-groove forming substrate. In particular, when the magnetic stripe recording layer 12 is formed on the protective base material, either the optical recording layer or the magnetic stripe position is largely deviated from the standard position and cannot be used.

It is an object of the present invention to provide an optical card medium having a structure for reducing the amount of "warpage" of the protective substrate which is the root of the above problems.

[0008]

According to the present invention, in an optical card recording medium, a protective substrate laminated on the recording layer via an adhesive layer is composed of at least three layers A, B and C, Provided is an optical card-shaped recording medium in which these layers are formed in this order from the inside to the outside, and the layers A and C are formed of the same material. In the optical recording medium of the present invention, the amount of warpage of the protective substrate can be reduced by changing the thickness of the layers A and C. In the present invention, the A, B, and C layers refer to the innermost layer overcoat, the protective substrate (core), and the outermost layer overcoat, respectively, in the protective substrate, and are formed in this order from the inner side to the outer side. It constitutes a protective substrate.

The protective base material for an optical card-shaped recording medium of the present invention has a small amount of "warpage", and is formed in a step of laminating a pregroove-formed substrate on which a recording layer is formed at the time of manufacturing an optical card. Positioning accuracy is improved.

FIG. 1 schematically shows a cross section of an optical card-shaped recording medium of the present invention. In the figure, (a) shows the structure of the protective base material, (b) shows the adhesive layer, (c) shows the structure of the pre-groove forming substrate, and (d) shows (a), (b) and (c) attached. The schematic diagram of the combined intermediates, (e) shows the optical card recording medium of the present invention. As the substrate 1, an optically transparent plastic material such as polycarbonate, polymethylmethacrylate, polyolefin or other polymer alloy can be used. Preformat 13
Are provided on the substrate 1 by injection molding, compression molding, casting molding, or the like. Alternatively, an ultraviolet curable resin layer may be provided on the substrate and formed by the so-called 2P method. A hard coat layer 6 is preferably provided on the surface of the substrate opposite to the surface where the pregroove is formed in order to prevent the occurrence of scratches on the substrate.

For the optical recording layer 2, any generally known optical recording material can be used. For example, Te,
Inorganic materials such as TeOx, anthraquinone derivatives (particularly those having an indathrene skeleton), dioxazine compounds and their derivatives, triphenodithiazine compounds, phenanthrene derivatives, cyanine compounds, merocyanine compounds,
Pyrylium compounds, xanthene compounds, triphenylmethane compounds, croconium dyes, azo dyes, crocones, azines, indigoids, polymethine dyes, azulene dyes, squalium dyes, cyanine dyes having polymethine chains, Organic dye substances such as tetraphenyl cyanine dyes can be used.

The optical recording layer containing these organic dyes may contain a stabilizer (quencher) such as an infrared absorber for the purpose of improving light resistance.

The thickness of the recording layer 2 is preferably in the range of 400 to 1200, but is usually set to a thickness at which the reflectance is maximized due to the correlation between the thickness of the recording layer and the reflectance.

As the material to be blended as the light stabilizer,
For example, substances shown in JP-A-60-163245 and JP-A-60-236131, or the following formulas (1) and (2)

[0015]

Embedded image (In the formula, R is a hydrogen atom, a lower alkyl group, X is an acid ion, and A is

[0016]

Embedded image Indicates. ).

Further, in the skeletons of the above formulas (1) and (2), a substance having a substituent of N; R having a methoxy group, a propenyl group or a cyclo ring group can be used.

Further, a metal complex represented by the following formulas (3) to (7) can be used.

[0019]

Embedded image

[0020]

[Chemical 4] (However, R ₁ to R ₄ may be the same or different and each is a substituted or unsubstituted alkyl group,
Represents an aryl group or an amino group, R ₅ to R ₈ may be the same or different, each represents a hydrogen atom, a halogen atom or a substituted or unsubstituted alkyl group or an amino group, and M represents Ni, Co, Mn, C
It represents a transition metal selected from u, Pd and Pt. The content of the light stabilizer contained in the optical recording layer 2 is usually 5 to 50% by weight, preferably 10 to 3% with respect to the content of the dye.
A range of 0% by weight is desirable.

The adhesive layer 3 used in the present invention may be any as long as it does not change the optical constants (reflectance, transmittance, spectrum) of the recording layer. However, the adhesive has a low melting point of 70 ° C or lower, or the softening point temperature is 65 ° C.
Lower than that, with a melt flow rate of 10 g /
It is preferable not to use those having a length of 10 min or more because the storage durability of the recording layer is deteriorated. Generally, hot melt adhesives, ethylene-vinyl acetate copolymers, ethylene-acrylic acid copolymers, ethylene-acrylic acid ester copolymers, ethylene-acrylic acid-polypropylene 3
It is possible to use a hot-melt adhesive containing a main copolymer, an ethylene-acrylic acid ester-maleic anhydride copolymer, or the like as a main component, or a thermosetting or room-temperature curable substance containing silicon as a main component. .

The core material (B) 4 of the protective substrate constituting the protective base material 9 of the present invention is polymethylmethacrylate, polycarbonate, polyvinyl chloride, polyethylene terephthalate, polystyrene, polysulfone, other polyolefin resin, stainless steel, or the like. Can be used.

The overcoat layer (A) 51 and the overcoat layer (C) 52 are made of the same material and are required to be transparent. The reason why the materials of the A and C layers must be the same will be described below.

The protective substrate 9 is produced by the method shown in FIG. In FIG. 3- (a), the printing layers 7 and 8 are formed on the surface of the core material 4. Next, as shown in FIG. 3B, the overcoat layers 51 and 52 are laminated on both surfaces of the core material, respectively. In the case of stacking, press processing is performed using a mirror surface press plate. For example, 51 and 52 are PMMs
In the case of A (polymethyl acrylate), PVC (polyvinyl chloride), etc., the protective substrate 9 is manufactured as follows.

1) C layer 5 under a pressure of ^{2 to} 10 kg / cm ^2.
2, press the core material 4 and the A layer 51, and 2) heat to 130 to 150 ° C. with pressing, for 30 s
Let stand for ec ~ 2 minutes.

3) Cooling to 30 to 50 ° C. while pressing.

4) The pressing pressure is reduced to complete the protective substrate 9. In the hot press working, A layer 51, C layer 5
When 2 is a different material, (a) the amount of thermal deformation (heat shrinkage) at the time of hot pressing is different, and the protective substrate 9 is warped.
As a result, the positional deviation becomes large when the recording layer 2 is attached to the substrate 1. In particular, when the magnetic stripe layer is present, the positional deviation at the time of bonding is a serious problem.

That is, in the process of manufacturing the optical card,
Each layer laminated as shown in FIG. 1 is finally cut into a card size to prepare a card. When processing into a card size, it is cut into a card size based on the preformat position.

When the position of the magnetic stripe is deviated from the predetermined position, the magnetic stripe is not cut as a reference, and the position of the magnetic stripe does not match the standard, and the magnetic stripe cannot be used. On the other hand, if the magnetic stripe is used as a reference for cutting, the position of the preformat of the optical card deviates greatly from the standard, and the function of the optical card cannot be used. Overcoat layer 5
2, 51 are laminated on both sides of the protective substrate 4 via heat fusion or an adhesive as shown in FIG. 1- (a). When the printing layer 7 as shown in the figure also serves as the light shielding layer, the thickness of the printing layer becomes relatively thick. Therefore, in such a configuration, it is desirable that the overcoat layers 52 and 51 have different thicknesses. Overcoat layers 51, 52
Has a thickness of usually 100 μm or less, preferably 30 to 10
0 μm is used. When the overcoat layer and the printing layer are heat-shrinked, the outer layer is preferably thinner than the inner layer.
The overcoat layers 52 and 51 and the printing layer are the protective substrate 4.
Even in the case of more bulging, the thickness of the outer layer is preferably thinner than that of the inner layer. According to the present invention, the thickness of the overcoat layer 52 is set so that the warpage of the protective substrate 9 does not occur due to the difference in the heat shrinkage amount of the protective substrate 4, the overcoats 51, 52 and the printing layer 7 during the mirror hot pressing. The thickness of the overcoat layer 51 to be 10 to 50 μm thinner than that of the overcoat layer 51,
It is possible to control the amount of sled.

When the protective substrate 4 has a light-shielding property, the light-shielding printing layer 7 is not necessary. In this case, the overcoat layer 5 is used.
The thicknesses of 1 and 52 are preferably equal.

The material of the overcoat layers 51 and 52 forming the protective substrate 9 of the present invention is preferably a transparent resin film. The material is not particularly limited as long as personal information by thermal transfer is possible. For example, materials such as polyvinyl chloride, polymethylmethacrylate, polycarbonate, polyvinyl chloride-polymethylmethacrylate copolymer and polypropylene are used. FIG. 2 shows an optical card medium having another structure of the present invention. In the figure (a)
Is a cross-sectional view of the first protective base material, (b) is a cross-sectional view of the optical recording layer forming substrate having the second protective layer, and (c) is a cross-sectional view of the optical card medium including (a) and (b). .

Adhesive layer 3 adhered to the upper layer of the optical recording medium
Significantly affects the storage durability and recording sensitivity of the optical recording layer. Therefore, the adhesive cannot be easily selected. Although the adhesive does not damage the recording layer, the overcoat layer 51 (A) may have poor adhesiveness. In such a case, the optical card configured as shown in FIG. 2 is effective. That is, the second protective layer 14 having good adhesion to the adhesive layer 3 is laminated, and the second protective layer 14 is further laminated.
Then, the protective substrate 9 is laminated via the adhesive layer 15 having good adhesiveness to obtain an optical card having excellent storage durability and high mechanical strength. In the above card, the adhesive layer 3
If it has barrier properties, it is possible to laminate the protective substrate 9 on the upper layer of the adhesive layer 3 using the adhesive layer 15 without providing the second protective layer 14.

Here, the second protective layer has an effect of suppressing a part of the components of the adhesive layer 15 from diffusing and damaging the recording layer 2. The damage to the recording layer described here is, specifically, a decrease in the reflectance of the recording layer. Even in the configuration as shown in FIG. 2, it is possible to control the warp amount in the same manner. As a result, the amount of warpage of the protective base material 9 is significantly reduced, and the positional deviation during lamination with the recording layer forming substrate is reduced. In particular, the effect is great when a protective base material having a magnetic stripe is laminated on the recording layer forming substrate. Because the cutting of the card is finally cut according to the position of the preformat 13,
At that time, if the position of the magnetic stripe on the protective substrate is deviated, the position of the magnetic stripe on the card deviates from the JIS and ISO standards, making it difficult to read the magnetic information. . In a normal magnetic card, the card size is cut based on the position of the magnetic stripe, so that the problem that requires the present invention does not occur.

[0034]

EXAMPLES The present invention will be specifically described below with reference to examples. Example 1 A pregroove of a polymethylmethacrylate optical card substrate 1 having a thickness of 0.4 mm, a length of 54 mm, and a width of 85 mm, in which a stripe-shaped pregroove having a width of 3 μm and a pitch of 12 μm was formed on one surface by casting. UV curable resin (product name:
Unidick 17-824-9, manufactured by Dainippon Ink and Chemicals)
Then, the hard coat 6 having a thickness of 3 to 4 μm was formed by irradiating ultraviolet rays. Further, a polymethine dye represented by the following structural formula (1-1) and a stabilizer represented by the following structural formula (1-2) are mixed in a weight ratio of 3: 1 on the surface of the substrate on which the pre-groove is formed. The recording layer 2 was formed into a film having a thickness of 900Å by a solvent coating method (see FIG. 1- (c)).

Next, a length of 54 m is formed on the organic dye recording layer.
m, width 85 mm, thickness 50 μm, adhesive sheet 3 made of 100 wt% ethylene-methyl methacrylate copolymer (Sumitomo Chemical Co., Ltd., trade name WD201; MMA (methyl methacrylate) content 10 wt%, melt flow rate 2
g / 10 minutes, a Vicat softening temperature of 75 ° C.), a protective substrate 9 having a thickness of 0.3 mm (see FIG. 1- (a)) is laminated, and pressure-bonded with a heating roll having a surface temperature of 130 ° C. In addition, an optical card was manufactured (see FIG. 1- (d)).

[0036]

Embedded image The protective base material 9 is produced by the procedure as shown in FIG. Logo printing and fixed information printing 8 are performed on one surface of the PMMA plate 4 having a thickness of 0.2 mm, and the light-shielding paint 7 is formed by screen printing to obtain the one shown in FIG. Next, a polyvinyl chloride film 52 having a thickness of 30 μm and a thickness of 50
A polyvinyl chloride film 51 having a thickness of μm is laminated (see FIG.
(See (b)), temperature 150 to 145 ° C., pressure 15 kg /
By press molding with a mirror press plate for 30 sec at cm ² , a protective substrate 9 as shown in FIG. 3- (c) was obtained. In this protective substrate 9, almost no "warpage" was observed.

Therefore, as shown in FIG. 1, when the protective base material 9 is laminated on the substrate 1 on which the recording layer is formed via the adhesive layer 3, the positional displacement between the substrate 1 and the protective base material 9 is extremely small. The number has decreased, and it has become possible to effectively use both the optical recording layer and the magnetic recording layer. Example 2 The thickness of the overcoat film 52 used in Example 1 was set to 2
Even if the overcoat film 51 was changed to a 5 μm acryprene film and the overcoat film 51 was changed to a 50 μm-thick acryprene film, a warpage-free protective base material 9 could be obtained as in Example 1. An optical card recording medium was obtained by laminating the protective substrate 9 on the recording layer forming substrate in the same manner as in Example 1. The "warpage amount" of this optical card was within 1 mm including the thickness of the card, and the positional deviation between the protective base material and the recording layer forming substrate was sufficiently small, which caused no practical problem. Example 3 The PMMA substrate 1 used in Example 1 was changed to a polycarbonate substrate having a thickness of 0.4 mm formed by a roller grooving method, and the core material 4 of the protective base material was changed to a polycarbonate having a thickness of 0.2 mm. Even if it did, the optical card recording medium equivalent to Example 1 was able to be obtained. Comparative Example 1 The polyvinyl chloride film 52 of Example 1 was formed to a thickness of 50 μm.
When an optical card was prepared in the same manner as in Example 1 by changing to the acryprene film of No. 3, "sledding" of the protective substrate 9
The magnetic tape formed on the protective base material is largely displaced from the position of the pre-group of the optical card, and when it is cut in accordance with the pre-groove of the optical card, information cannot be recorded / reproduced on the magnetic tape.

[0038]

In the optical card recording medium of the present invention, since the warp amount of the protective base material is small, (1) the positional displacement between the protective base material and the optical recording layer forming substrate is reduced and the productivity is improved. (2) When a magnetic stripe is formed on the surface of the protective substrate, the positional deviation between the optical recording layer and the magnetic recording layer becomes small, and as a result, the reliability of recording / reproducing of the optical recording layer and the magnetic recording layer is improved. improves.

[Brief description of drawings]

FIG. 1 is a schematic sectional view illustrating an optical card-shaped recording medium of the present invention. (A) Sectional drawing which shows a protective base material. (B) Sectional drawing which shows an adhesive layer. (C) Sectional drawing which shows a pre-groove formation board. (D) A schematic diagram of an intermediate body obtained by laminating (a), (b), and (c).

FIG. 2 is a schematic cross-sectional view illustrating another optical card-shaped recording medium of the present invention. (A) Sectional drawing which shows a 1st protective base material. (B) A sectional view showing an optical recording layer forming substrate having a second protective layer. (C) A sectional view showing the entire optical card recording medium.

FIG. 3 is a schematic cross-sectional view illustrating a process of forming a protective base material. (A) A sectional view showing a core substrate on which fixed information is printed. (B) Sectional drawing which shows the press molding condition by a mirror surface press plate. (C) A sectional view showing the entire protective substrate.

FIG. 4 is a schematic cross-sectional view illustrating a conventional optical card recording medium. (A) A cross-sectional view showing an overall image of a recording medium. (B) A cross-sectional view showing the state of “warpage” in which a protective base material is generated after mirror surface hot press molding.

[Explanation of symbols]

 1 Pre-Groove Forming Substrate 2 Optical Recording Layer 3 Adhesive Layer 4 Protective Substrate (Core) 51 Overcoat Inner Layer 52 Overcoat Outermost Layer 6 Hard Coat 7 Printing Layer (Hidden Layer) 8 Common Information Printing Layer 9 Protective Base Material 10 Personal Information Print part 11 Recording / reproducing laser light 12 Magnetic stripe 13 Preformat 14 Second protective layer / transparent layer 15 Adhesive layer 21,22 Mirror surface press plate

Claims (2)

[Claims] 1. An optical card-shaped recording medium, wherein a protective base material laminated on the recording layer via an adhesive layer is composed of at least three layers A, B and C, and these layers are directed from the inside to the outside. An optical card-shaped recording medium which is formed in the order of levers and in which the layers A and C are formed of the same material. 2. The optical card recording medium according to claim 1, wherein the thickness of the layers A and C is changed to reduce the amount of warpage of the protective substrate.