JPS63106943A - Optical card - Google Patents

Abstract

PURPOSE:To improve durability against exfoliation by adhering an opaque card base material to a plane part on the surface of a transparent resin base material where an optical recording layer except a track groove part is not provided by an adhesive agent curable by light or combination use of light and heat. CONSTITUTION:This optical card is formed by providing the optical recording layer 3 on the surface of the track groove part of the transparent resin base material 1 having the track groove part 2 and adhering the base material 1 and the opaque card base material 5 via an air layer 7 interposed on the layer 3 in the plane part 8 on the surface of the base material 1 where the layer 3 except the track groove part is not provided by the adhesive agent 6 curable by light or combination use of light and heat. Mass productivity is high if the adhesive agent 6 is of a photosetting type to be cured by photoirradiation. Economy and durability are high if said agent is of the type curable by combination use of light and heat. Damaging of the layer 3 is obviated by adopting the photosetting adhesive agent even if the layer 3 has low heat resistance. The tight adhesiveness between the base material 5 and the base material 1 is thus improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical card, and more particularly to a cart-shaped information recording carrier for optically recording and reproducing information.

[Prior Art] Conventionally, magnetic materials have been mainly used as recording materials embedded in cards such as credit cards, bank cards, and clinic carts.

Although such magnetic materials have the advantage that information can be easily written and read, they have the disadvantage that the information content can be easily changed and high-density recording is not possible. In order to solve these problems, an optical information recording method using an optical card was proposed as a means to efficiently handle a wide variety of information, and optical information recording carriers, recording/reproducing methods, recording/reproducing devices, etc. for this purpose were proposed. has been done.

Such an optical card as an information storage carrier generally uses a laser beam to evaporate a part of the optical recording layer on the information storage carrier, cause a change in reflectance, or cause deformation. Information is recorded or reproduced based on differences in optical reflectance and transmittance. In this case, the optical recording layer does not require any development treatment after information is written.
The so-called DRAW allows you to “read directly after writing”
(direct read after write; dir
It is an effective recording medium for optical cards because it is capable of high-density recording and additional writing is possible.

FIG. 3 is a schematic cross-sectional view of a conventional optical cart. In FIG. 3, 1 is a transparent resin base material, 2 is a track groove part,
3 is an optical recording layer, 4 is an adhesive layer, and 5 is an opaque card base material. In FIG. 3, information is recorded and read by optically writing and reading through the transparent resin base material 1 and the track groove portion 2. At this time, tracking can be performed using the phase difference of the laser beam by utilizing the fine irregularities of the track groove.

[Problems to be Solved by the Invention] In the conventional optical card, as shown in FIG. It is manufactured by thermocompression bonding the opaque card base material 5, and the adhesive used for the adhesive layer 4 is generally a thermoplastic adhesive.

However, in many cases, the optical recording layer 3 is easily deteriorated by substances contained in the adhesive, and the adhesive may include a polymerization initiator,
Conventional curable adhesives containing sensitizers, catalysts, etc. could not be used. Therefore, a thermoplastic adhesive is used as the adhesive layer 4, but in that case,
There were problems such as insufficient adhesion between the transparent resin base material 1 having the track groove portion 2 and the opaque card base material 5.

The present invention was made for the purpose of solving the above-mentioned problems, and consists of laminating a transparent resin base material having a track groove with an optical recording Q layer on the surface and an opaque card base material through an adhesive. In the DRAW type optical card, the transparent resin base material and the opaque card base material are bonded to each other using light or a combination of light and heat curing adhesive in a portion excluding the optical recording layer, thereby achieving close contact between the two. The purpose of this invention is to provide an optical card with improved durability and durability against peeling.

[Means for Solving the Problems] That is, the present invention provides an optical recording layer on the track groove surface of a transparent resin base material having track grooves on the surface, and a space layer is interposed on the optical recording layer. It is made by laminating opaque card base materials, and the opaque cart base material is adhered to the flat surface portion of the surface of the transparent resin base material, on which no optical recording layer is provided other than the track groove portion, using a light-curable adhesive or a combination of light and heat-curable adhesive. It is an optical card that is characterized by:

An optical card according to the present invention will be explained below based on a specific example shown in the drawings.

FIG. 1 is a schematic cross-sectional view showing one embodiment of an optical card according to the present invention.

In FIG. 1, the optical card according to the present invention has an optical recording layer 3 provided on the track groove surface of a transparent resin base material l having track grooves 2 on the surface, and a space layer 7 on the optical recording layer 3. The transparent resin base material 1 and the opaque card base material 5 are interposed between the transparent resin base material 1 and the opaque card base material 5 by light or optical
It is bonded with a thermosetting adhesive 6.

FIG. 2 is an explanatory diagram showing an optical card adhesion process according to the present invention. In FIG. 2, the optical card has an optical recording layer 3 formed on the trough groove surface of a transparent resin base material l having track grooves 2, and a track groove 2 formed on an opaque card base material 5. A layer made of a light or light/thermal curing adhesive 6 is provided on the part excluding the part corresponding to the area (the part where the optical recording layer 3 is formed), and the transparent resin is placed with the optical recording layer 3 on the inside. The base material 1 and the opaque card base material 5 are exposed to light or
It is possible to produce an optical cart having the structure shown in FIG. 1 by adhering with a thermosetting adhesive 6.

In the present invention, the normal track groove? B2 and optical recording layer 3
The total thickness of the adhesive 6 is about 0.15 to 0.6 ILm, whereas the thickness of the light-curable adhesive 6 or a combination of light and heat curable is about 10 to 200 ILm, depending on the viscosity of the adhesive.
Because of the IL 11, a space layer 7 is formed between the optical recording layer 3 and the opaque card base material 5.

When the substrate is made of thermoplastic resin, the method for forming the track groove portion 2 on the transparent resin base material 1 is a method of thermally transferring a stamper mold by a method such as injection molding or heat press molding at a temperature higher than the melting point; Alternatively, a photocurable resin composition is applied onto the substrate, a stamper mold is brought into close contact with the substrate, and ultraviolet rays or the like are irradiated.
This is carried out by a method of phototransferring a stubber mold by a method of curing the photocurable resin composition.

In the thermal transfer method, the track groove and the transparent resin base material are formed as one body, whereas in the optical transfer method, the track groove is not formed on the same body as the transparent resin base material, but is formed by adhering them. be done.

Alternatively, apart from the stamper-type transfer method, a resist film is formed on a transparent resin substrate having a transparent thin film of a desired thickness that can be etched, and the resist film is exposed through a photomask having a pattern of track grooves. Alternatively, a resist pattern may be formed by development, and the light-transmitting thin film may be etched using the resist pattern as a mask to form track grooves on the substrate.

As the transparent resin base material 1, materials with few inconveniences in optical recording/reproduction are preferable, such as acrylic resin, polyester resin, polycarbonate resin, vinyl resin, polysulfone resin, polyimide resin, polyacetal resin, polyolefin resin, polyamide resin,
It is also possible to use cellulose derivatives.

As the opaque card base material 5, any material that can be used as a normal cart base material can be used, and specific examples include polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinylidene chloride, and polymethacrylic acid. Acrylic polymers such as methyl, polystyrene, polyvinyl butyral,
Acetyl cellulose, styrene-butadiene copolymer,
Polyethylene, polypropylene, polycarbonate, epoxy, acrylonitrile-butadiene-styrene copolymer, etc. are used. Depending on the case, metal sheets of iron, stainless steel, aluminum, tin, copper, zinc, etc., synthetic paper, paper, etc. can also be used. Furthermore, a laminate of the above-mentioned materials can also be used. These opaque cart base materials 5
If necessary, pretreatment for improving adhesion such as corona discharge treatment, plasma treatment, and brimer treatment may be performed.

The optical recording layer 3 has a wavelength near the wavelength of the light source used, for example, the wavelength of the energy beam for reproduction is 650 nm or more, especially 70 nm.
0 to 9000■, it is preferable that there is a large difference in reflectance between the pits, etc., which are recorded areas, and that of unrecorded areas, and in order to write, it is preferable that there is absorption in the above wavelength range. is necessary.

In addition, it is preferable that the energy required to cause a change in reflectance due to irradiation with the energy beam for recording is smaller.Furthermore, the energy beam required for reproducing changes the reflectance of the recorded area (bits, etc.) 3 and the unrecorded area. Preferably, it is difficult to change.

For example, Te, Sb, Mo, Ge, V, Sn
oxides such as, compounds such as Te-Sn, TeOx-Ge, metals and organic compounds or inorganic sulfides such as Te-el14゜Te-C52, Te-styrene, 5n-3O, Ge5-3n, 5nS-3. Composites with metal particles such as silver dispersed in thermoplastic resins such as nitrocellulose, polystyrene, and polyethylene, or metal particles aggregated on the surface of such thermoplastic resins, chalcogen or Color-forming Mon, -Cu, M
oO+-3n-Cu or the like is used.

Furthermore, an organic thin film whose optical properties can be changed by an energy beam can also be used, and this organic thin film can be continuously coated using a solution or a dispersion system, which is preferable for mass production.

For example, anthraquinone derivatives (especially those having an intasrene skeleton), dioxazine compounds and their derivatives, triphuedithiazine compounds, phenanthrene derivatives, cyanine compounds, merocyanine compounds, biryllium compounds, xanthine compounds, triphenylmethane compounds, croconium compounds Examples include dyes, azo dyes, crocones, azines, indigoids, methine dyes, azulenes, squalium derivatives, sulfur dyes, and metal dithiolate complexes.

A pigment such as this pigment can be formed by a known coating method. For example, methods such as dip coating, spray coating, spinner coating, bar code coating, plate coating, roll coating, and curtain coating can be mentioned. The thickness of the thin film is approximately 500 to 2,000 thick, preferably around 1,000 thick. In particular, from the viewpoint of recording sensitivity, it is desirable that the film be thin, but from the viewpoint of reproduction S/N ratio, it is desirable that it be thicker, and the optimum film thickness differs depending on the type of dye.

In the present invention, an opaque card base material 5 and a transparent resin base material l
The light or light/heat curing adhesive 6 used for adhesion may be appropriately selected from known adhesives depending on the type of the opaque card base material 5 and the transparent resin base material l used. 1. The light or light/heat curable adhesive 6 of the present invention is highly mass-producible if it is a light curable adhesive that is cured by light irradiation, and is economical and durable if it is a light/heat curable adhesive. Moreover, even if the optical recording layer 3 has low heat resistance, by making the adhesive photocurable, the opaque card base material 5 and the transparent resin base can be bonded without damaging the optical recording layer 3. It is possible to improve the adhesion with the material. Further, even if it is a combination of light and heat curing, the heat curing temperature may be lower than the heat resistance temperature of the optical recording H3.

In the present invention, polymethyl methacrylate and polycarbonate are preferable as the transparent resin base material l.
As the light-curable adhesive 6 or a combination of light and heat curable adhesive 6, epoxy-based, urethane-based, or polyester-based adhesives containing ultraviolet curable acrylate (methacrylate) as a main ingredient can be used. Furthermore, those to which a thermal polymerization initiator or the like is added are preferable because they are both light and heat type and can provide a product with high adhesive strength.
Hitachi Chemical), Diabeam (Mitsubishi Rayon), Tumacoat (Somar Kogyo), Daicure Unidic (Dainippon Ink), Viscoat (Osaka Organic Chemical), Delbo MAX
Commercially available products such as (Toa Paint) and Orester (Mitsui Toatsu) can be preferably used.

[Function] The optical cart of the present invention has an optical recording layer provided on the track groove surface of a transparent resin base material having track grooves on the surface, and an opaque card base material is laminated with a space layer interposed on the optical recording layer. The opaque cart base material is bonded to the flat surface portion of the transparent resin base material other than the track groove portion where no optical recording layer is provided, using a light-curable adhesive or a combination of light and heat curing adhesive. A space layer is provided between the recording layer and the opaque cart base material, and the shape of the bit formed on the optical recording layer is adjusted by irradiation with laser light, and it is made transparent by light or a combination of light and heat curing adhesive. Since the resin base material and the opaque card base material are bonded together, it is presumed that the adhesion is improved and durability is imparted.

[Examples] Hereinafter, the present invention will be explained with reference to Examples, but the present invention is not limited thereto in any way.

Example 1 As a transparent resin base material, polycarbonate (Panlite-211, manufactured by Teijin Kasei Co., Ltd.) with a thickness of 0.4 mm was heat-pressed with a pitch of 12 μm, a depth of Q, 13B, and a groove width of 3. track grooves were formed. A solution of a dye of the following formula [I] dissolved in a mixed solvent of acetone-diacetone alcohol-isopropanol at a concentration of 5% by weight was gravure coated onto the track groove to form an optical recording layer with a thickness of approximately 900 mm. Formed.

As the opaque cart base material, 0.4 mm white polycarbonate (Taflon, manufactured by Idemitsu Petrochemical ■) was used, and Unidic (manufactured by Dainippon Ink ■) was screen printed as an adhesive on areas other than those corresponding to the optical recording layer. Thickness:
1O) Print on is, without verification, Toru 11 t! l
If)! The adhesive was bonded to a base material, and the optical recording layer portion was shielded from light and placed in an ultraviolet irradiation device to cure the adhesive with ultraviolet light.

The obtained optical card was more difficult to peel off than an optical card that was adhered with a normal thermoplastic adhesive.

[Effects of the Invention] In the optical cart according to the present invention, an optical recording layer is provided on the track groove surface of a transparent resin base material having a track groove part, and the optical recording layer is formed between the transparent resin base material and the opaque card base material. Since the removed portion is bonded with light or a combination of light and heat curing adhesive, it has the following effects.

■ Improved adhesion in the planted layer structure of the Hikari Cart.

A light cart that is durable against peeling can be obtained.

■No need to cover the optical recording layer with thermoplastic adhesive,
The pit shape obtained by laser beam writing on the optical recording layer becomes uniform, making it easier to obtain a good recorded and reproduced signal.

■The approach process is not based on thermocompression bonding, but is a light or light/thermo curing adhesive, which eliminates lamination irregularities that occur during thermocompression bonding, and is highly productive because it cures with light.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing an embodiment of the optical cart according to the present invention, FIG. 2 is an explanatory diagram showing the adhesion process of the optical cart according to the present invention, and FIG. 3 is a schematic cross-sectional view of a conventional optical card. FIG. 1... Transparent resin base material 2... Track groove portion 3... Optical recording layer 4... Adhesive layer 5... Opaque cart base material 6... Light or light/thermal combination adhesive 7 ...Spatial layer 8...Plane part

Claims (1)

[Claims] An optical recording layer is provided on the track groove surface of a transparent resin base material having track grooves on the surface, and an opaque card base material is laminated with a space layer interposed on the optical recording layer, the opaque card base material An optical card characterized in that it is bonded to a flat surface portion of a transparent resin base material, on which no optical recording layer is provided other than the track groove portion, with a light-curing adhesive or a combination of light and heat curing adhesive.