JPH0753133Y2 - Optical card - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an optical card capable of optical writing and reading.

<Prior Art> In recent years, it has been required to add a high function to a magnetic card widely used in each field. Therefore, an optical card has been proposed as a card medium having a recording capacity larger than that of a magnetic card, and in particular, an optical card capable of additional writing is considered to have a wide range of use. This is because the optical card is highly portable and has a large recording capacity, and is considered to be the most effective recording medium for personal information. The structure of such an optical card is
A transparent substrate having an optical recording layer and a card base material are bonded together via an adhesive layer.

The recording / reproducing method for this optical card is to record information by irradiating the optical recording layer with laser light such as a semiconductor laser through a transparent substrate and forming holes or bits by the heat of the laser light. Is to read information by using the same laser light source as used for recording, irradiating the recording layer with the irradiation light intensity weakened to about 1/10, and detecting the change in reflectance.

Since an optical card is generally carried in a wallet or the like like a cash card or a credit card, various external forces may be applied to it, which may cause deformation or damage, so it is necessary to have strength that can withstand these external forces. In addition, it is necessary to be thin from the appearance as a card.

In other words, the optical card is required to have a structure that can withstand considerably severe usage conditions and environmental conditions as compared with the optical disk. In addition to the characteristics, mechanical strength such as impact resistance and bending resistance is strongly required.

As the transparent substrate material, for example, polystyrene resin, polyester resin, polyvinyl chloride resin, and the like have a large birefringence, and acrylic resin, epoxy resin, and the like have a drawback that mechanical strength is weak.

Therefore, as a transparent base material for an optical card, a polycarbonate resin sheet having high transparency and high mechanical strength is generally used.

<Problems to be solved by the invention> However, this polycarbonate resin is also not so small in birefringence that an optical card produced by using this as a transparent base material adversely affects the detection of a reproduction signal, and S / It has a drawback that the N ratio is lowered.

Therefore, the present invention has high transparency based on the above problems,
By using a transparent base material having both excellent optical properties such as small birefringence and high mechanical strength such as impact resistance and bending resistance as a transparent substrate of an optical card,
The purpose is to provide a highly reliable optical card.

<Means for Solving the Problems> In order to achieve the above object, the present invention provides an optical card in which at least an optical recording layer and a transparent substrate are sequentially stacked on a card substrate, and the transparent substrate is made of transparent amorphous polyester. It is an optical card using a resin sheet.

<Operation> As described above, according to the present invention, a transparent amorphous polyester resin sheet having high transparency, small birefringence, and high impact resistance and bending resistance is used as a transparent substrate, and therefore, reliability is improved. It is possible to manufacture an optical card having high properties.

<Embodiment> An embodiment of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, the optical card of the present invention uses a transparent amorphous polyester resin sheet as a material of a transparent substrate (1), and a guide groove (2) is formed on the sheet, and the guide groove (2) is formed on the guide groove. A transparent substrate (1) having an optical recording layer (3) and a backing substrate (5) are bonded together via an adhesive layer (4).

As a method of forming the guide groove (2), a nickel stamper having a guide groove and a preformat pattern is applied with an ultraviolet curable resin, a transparent substrate is pressed against the transparent substrate, and ultraviolet rays are irradiated from the transparent substrate side. Forming 2P method and 2
A compression molding method in which a transparent substrate and the stamper are superposed on a metal plate having excellent surface smoothness and sandwiched, heated, and pressed to form the transparent substrate, the thermal characteristics of the transparent substrate, etc. In consideration of this, it is desirable to select a method that is of good quality and can be formed efficiently.

The transparent amorphous polyester resin described in the present invention is, for example, an average molecular weight of a polyarylate resin composed of bisphenol A and terephthalic acid, an ester copolymer of terephthalic acid and ethylene glycol, and an aromatic glycol.
About 15,000 to 40,000 polymers can be used.

The laser recording material used in the optical recording layer (3) is a low melting point metal such as tellurium, bismuth, or aluminum, an alloy mainly containing them, or an anthraquinone-based phthalocyanine-based or azaannulene-based organic recording material for additional recording. Examples include dyes. Further, as the erasable / writable material, there are a magneto-optical type and a phase change type such as TbFe-GbTbFe, GbTbFe, and TbCo type, but any material that can be recorded by laser light may be used depending on the intended use. Is desirable. As the method for forming the optical recording layer (3), any of vacuum vapor deposition, sputtering, CVD, spin coating, roll coating, etc. may be used, and it is preferable to use them properly depending on the properties of the material.

The material used for the backing base material layer (5) is not particularly limited as long as it has desired mechanical strength and thermal characteristics, and may be the same as the transparent substrate (1) according to the present invention.
Other examples include polyethylene, polypropylene, ABS resin, polyvinyl chloride, polycarbonate resin and the like.

As the adhesive (4), it is necessary to select an adhesive that does not cause an interaction (interaction) with the recording layer, has adhesive strength, and has little influence on optical recording / reproduction. Epoxy, urethane, acrylic An adhesive such as a system is used.

Further, as shown in FIG. 2, in order to increase the recording sensitivity of the optical recording layer (3), a buffer layer (6) such as a silicone resin is provided between the optical recording layer (3) and the adhesive layer (4). May be provided. Further, when the protective layer (7) such as SiO ₂ is formed on the buffer layer (6), the interaction with the adhesive layer is prevented, the range of selection of the adhesive to be used is increased, and the external factors such as humidity may increase. Can be protected. Hereinafter, a specific example thereof will be described.

[Example 1] With a thickness of 0.4 m / m and a size of 100 m / m x 80 m / m UV curable resin is applied to a transparent amorphous / aromatic polyester resin sheet having a structure of n = 100, and the groove pitch is 12
μm, groove width 2.5 μm, and groove depth 0.20 μm. A 0.3 m / m thick nickel stamper plate with guide grooves is pressed against the transparent amorphous / aromatic polyester resin sheet to irradiate it with ultraviolet rays to remove the resin. A transparent substrate (1) having a guide groove (2) formed was produced by curing.

300 Å Te on the guide groove surface side of the transparent substrate (1) obtained in
Was evaporated by a resistance heating method to form an optical recording layer (3).

Epoxy adhesive (4) on the optical recording layer (3)
(Ciba Geigy Inc., Araldite) through 0.3m / m thickness 100m / m x 80m / m size hard white polyvinyl chloride (P
VC) is adhered, and after curing, punched optical card is obtained with a card size of 85.5 m / m × 54 m / m.

When this optical card was recorded with a semiconductor laser (8 mW, 100 kHz), good recording was made, and when it was reproduced with a 0.6 mW semiconductor laser, a good signal was obtained, and shock resistance, bending resistance, etc. The mechanical strength was sufficient to withstand the use of cards.

Example 2 With a thickness of 0.4 m / m and a size of 100 m / m × 80 m / m UV curable resin is applied to a transparent amorphous / aromatic polyester resin sheet having a structure of n = 100, and the groove bitch 12
μm, groove width 2.5μm, groove depth 0.20μm, 0.3m / m thick nickel stamper plate with guide grooves formed, pressed against it and irradiated with ultraviolet rays from the transparent amorphous / aromatic polyester resin sheet to cure the resin. By doing so, a transparent substrate (1) having a guide groove (2) formed was manufactured.

A 0.07 μm thick optical recording layer was prepared by applying a 1.5 wt% solution of a cyanine dye (trade name: CY-9, manufactured by Nippon Kayaku Co., Ltd.) to the guide groove surface side of the transparent substrate (1) obtained in 1. with a spin coater. (2) is formed.

A UV-curable silicone resin (XE17-610 manufactured by Toshiba Silicone Co., Ltd.) was applied to the surface of the optical recording layer (3) by a screen printing method, and then irradiated with 40 mg / cm ² of ultraviolet rays,
It is cured to form a buffer layer (6).

On the buffer layer (6), SiO ₂ is vapor-deposited to a thickness of 0.1 μm by a resistance heating method to form a protective layer (7).

0.3m of backing base material (5) with urethane adhesive (5) (HB Fura, UR2194) on protective layer (7)
Bonded to 100m / m x 80m / m size hard white PVC with a thickness of / m, and after curing, punched out to a card size of 85.5m / m x 54m / m to obtain an optical card.

Recording and reproduction were carried out in the same manner as in Example 1, and good results were obtained, which was sufficient to withstand use of a mechanical strength card, and further improved recording sensitivity and resistance of the optical recording layer (3). Was seen.

In addition, on the white PVC which is the card substrate (5), only the part corresponding to the optical recording part (3) is printed by black solid by silk screen printing, and the other part is used as a card design part and any characters, patterns, etc. are colored. It is also possible to print.

<Comparative Example> An acrylic resin sheet, a polycarbonate resin sheet, or a crystalline polyester resin sheet was used instead of the transparent amorphous aromatic polyester resin sheet used as the transparent substrate material in Example (1). We compared the performance with the optical card.

<Effect> As described above, according to the present invention, by using the transparent amorphous polyester resin sheet as the transparent substrate material, the recording / reproducing characteristics are good, and the impact resistance, bending resistance, etc. are excellent. An optical card having sufficient mechanical strength can be obtained.

Further, by forming a multilayer with a buffer layer and a protective layer, the recording sensitivity and the durability of the optical recording layer can be improved.

[Brief description of drawings]

FIG. 1 is a partially enlarged sectional view of an embodiment of the optical card of the present invention, FIG. 2 is a partially enlarged sectional view of an optical card of another embodiment of the present invention, and FIG. 3 is the present invention. FIG. 3 is a plan view of an example of an optical card used in the above. DESCRIPTION OF SYMBOLS 1 ... Transparent substrate, 2 ... Guide groove 3 ... Optical recording layer, 4 ... Adhesive layer 5 ... Backing base material, 6 ... Buffer layer 7 ... Protective layer, 10 ... Optical card

Claims (2)

[Scope of utility model registration request] 1. An optical card in which at least an optical recording layer and a transparent substrate are sequentially stacked on a backing substrate, wherein a transparent amorphous polyester resin sheet is used for the transparent substrate. 2. The optical card according to claim 1, wherein a guide groove and preformat data are formed on the transparent substrate.