JPH08132772A - Optical card - Google Patents

Abstract

PURPOSE: To provide an optical card formed by embedding an optical recording member in the recessed part of a card base material and excellent in bending strength. CONSTITUTION: In an optical card formed by embedding an optical recording member 1 wherein an optical recording layer is laminated so as to cover the track pattern provided on the rear surface of a transparent protective layer in the recessed part in a card base material through an adhesive layer, the optical recording member 1 is embedded at the position passing at least one of the center line (x) in the long side direction of the card and the center line (y) in the short side direction thereof. The stress generated when the card is bent is dispersed and a generation of a crack is prevented. It is more pref. that the optical recording member 1 is embedded in an almost line symmetric state with respect to the center line (x) or the center line (y). It is pref. to provide the adhesive layer not only to the bottom surface of the optical recording member 1 but also to the end surface thereof. Further, in order to make the optical recording member easy to fit, a taper may be given to the end surface of the optical recording member 1 and the side surface of the recessed part of the card base material 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical card used for credit cards, cash cards, medical cards and the like.

[0002]

2. Description of the Related Art Conventionally, as a card-type recording medium, an optical card having a storage capacity larger than that of a magnetic card or an IC card has been developed. There are a ROM type, a write-once type, and an erasable type as the recording system of this optical card, and a recording medium and a structure of each are being studied. Among such optical cards, those in which an optical recording member is embedded in a card base material in an island shape are known (for example,
See Japanese Utility Model Publication No. 22222/1990).

[0003]

By the way, in the embedded optical card described in the prior art, since the optical recording member is embedded in the rectangular concave portion provided in the card base, the card is bent when the card is bent. There is a problem in that stress concentrates in the concave portions of the base material and cracks occur in this portion when the bending is repeated. In particular, when the optical recording member is embedded in the extreme upper side, the lower side, the left side, or the right side of the card, this tendency is greatly exhibited.

The present invention has been made in view of the above problems and drawbacks, and an object thereof is to provide an optical card excellent in bending strength.

[0005]

In order to achieve the above object, the present invention provides an optical recording member 1 in which an optical recording layer is laminated so as to cover a track pattern provided on the back side of a transparent protective layer.
In an optical card in which is embedded in a recess formed in the card substrate 2 via an adhesive layer, as shown in FIGS. 1 (a) to 1 (d), a center line x and a short side in the long side direction of the card are used. It is characterized in that the optical recording member 1 is embedded at a position passing through at least one of the center lines y in the side direction.

Then, as illustrated in FIGS. 2A and 2B, the optical recording member 1 is approximately line-symmetrical with respect to the center line x in the long side direction or the center line y in the short side direction of the card. The strength against bending is further improved by embedding in. In addition,
Since the strength against bending is weaker in the long side direction than in the short side direction, even if the card is not symmetrical with respect to the center line y in the short side direction of the card as shown in FIG. 3, the bending strength is not significantly affected.

Further, it is preferable to embed the optical recording member 1 in the concave portion of the card base material with its end face not exposed from the surface of the card base material 2. In this case, a space between the optical recording member 1 and the card base material 2 is provided. It is preferable that the adhesive layer is provided not only on the bottom surface of the optical recording member 1 but also on the end surface thereof.

Further, in order to make it easy to fit the optical recording member 1 into the concave portion of the card substrate 2, as shown in the sectional view of FIG. 4, the end face a of the optical recording member 1 and the card substrate 2 are formed. It is preferable to provide a taper α on each side surface b of the recess, and such a taper α may be provided at least on each side in the longitudinal direction.

The layer structure of the optical card will be described with reference to FIG. 3 in the figure is a track pattern 4 on the lower surface.
The transparent protective layer 5 has an optical recording layer 5 laminated to cover the track pattern 4, and the surface protective layer 6 is provided on the surface of the transparent protective layer 3. The optical recording member 1 is constituted by these. . The optical recording member 1 is embedded in the concave portion 7 formed in the card base material 2 with the adhesive layer 8 interposed therebetween.

There are roughly two methods for obtaining the optical recording member 1 and the card substrate 2 as described above. The first is a method of forming the end surface a of the optical recording member 1 and the concave portion 7 of the card base material 2 by cutting, and the second is a method of forming the optical recording member 1 and the card base material 2 by an injection method or a casting method. Is.

In the first method, first, the transparent protective layer 3
A multi-faceted optical recording member is formed by forming a surface hardened layer 6 on one surface and a layer having a track pattern 4 and an optical recording layer 5 on the other surface. The size of the optical recording member 1 is obtained. At this time, a desired taper α is provided on the end face a, if necessary.
In order not to damage the optical recording layer 5 during this cutting,
A protective layer is provided on the surface of the optical recording layer 5. As the protective layer, an acrylic type, vinyl chloride-based type, polyester type or the like that does not affect the optical recording layer 5 is used. If a protective film is used, it is not necessary to provide this protective layer.

The material used for the transparent protective layer 3 must have low birefringence. Specifically, polycarbonate (PC), polymethylmethacrylate (PMM
A), acrylonitrile-styrene copolymer (AS),
Cellulose propionate (CP), cellulose acetate butyrate (CAB), polyvinyl chloride (PV
C), polyester and the like can be used, and among them, polycarbonate (PC) having a thickness of about 400 μm is suitable.

As the surface hardened layer 6 formed on one surface of the transparent protective layer 3, an acrylic UV curable hard coat agent is suitable. In addition, a melamine-based or silicon-based hard coating agent may be used, but one having excellent temperature and humidity suitability and having high hardness and not causing cracks even when bent is preferably used.

The layer having the track pattern 4 formed on the other surface of the transparent protective layer 3 is formed by a generally known 2P method, injection method, casting method or the like. At this time, when the track pattern 4 is formed by the 2P method, a resin curable by UV is used, and the injection method,
In the casting method, the same transparent protective layer 3 is used. It should be noted that the layer with the track pattern 4 may be filled up except that it has a dimple that allows cutting.
This is because the optical recording material is effectively used.

As a material for forming the optical recording layer 5, in addition to the commonly used metal-based optical recording materials such as tellurium-based and bismuth-based materials, dye-based optical recording materials such as phthalocyanine-based materials,
A naphthoquinone type can be used. Further, not only the write-once type but also the ROM type may be used.

On the other hand, the card substrate 2 is formed with a recess 7 in which the optical recording member 1 is embedded by cutting (counterbore processing). The recess 7 is the center line x in the long side direction of the card.
And at least one of the center lines y in the short side direction. In this case, the position of the recess 7 may be line symmetric with respect to the center line x, and may be line symmetric with respect to the center line y. Further, when the end surface a of the optical recording member 1 is provided with a taper α, the side surface b of the recess is subjected to counterbore processing so as to be the same as the taper α of the end surface of the optical recording member 1. Further, in order to obtain the parallelism between the concave portion 7 and the card end surface, it is preferable that the end surface a of the card base material 2 is cut at the same time as the counterbore processing.

As the card base material 2, polyvinyl chloride, ABS resin or the like is used. In the case of polyvinyl chloride, 0.10 / 0.28 / 0.28 / 0.10 mm,
0.05 / 0.37 / 0.37 / 0.05mm, etc. 4
Layers are suitable. In addition, 0.10 mm, 0.05
mm is transparent polyvinyl chloride, 0.28m
m, 0.37 mm is opalescent polyvinyl chloride,
Printing is performed on one side of the opalescent polyvinyl chloride to increase the abrasion resistance of the printing.

Then, the optical recording member 1 is fixed to the concave portion 7 of the card substrate 2 via the adhesive layer 8. As the adhesive used for this, conventionally known ones such as urethane type, epoxy type, acrylic type, vinyl type and amide type can be used,
Since the adhesive is in direct contact with the optical recording layer 5, it is preferable that the adhesive has good recording sensitivity and excellent temperature and humidity suitability. As a bonding method, a UV curable adhesive is dropped on the concave portion 7 of the card substrate 2, the optical recording member 1 is fitted therein, and the flat recording press corresponding to the size of the optical recording member 1 is pressed to irradiate ultraviolet rays. And a hot melt adhesive is applied to the optical recording member 1 by a T-die and then hot-pressed by a flat press or a roll press for adhesion. In either case, the adhesive is the end surface a of the optical recording member 1.
The press condition is set so as to be distributed between the concave side surface b of the card base material 2 and. When an adhesive is used to fix the optical recording member 1 in the concave portion 7 of the card substrate 2, a double-sided adhesive sheet may be used.

According to another method of the first method, the surface hardened layer 6 is formed on one surface of the transparent protective layer 3 and the layer having the track pattern 4 and the optical recording layer 5 are formed on the other surface. And a plastic hot melt adhesive is applied on the optical recording layer 5 of the optical recording member 1.
After cutting the optical recording member 1 laminated up to this adhesive individually, the same cutting process as described above is performed, and then the optical recording member 1 is fitted into the concave portion 7 of the card substrate 2 and then flat pressed or rolled. Bond by hot pressing with a press. In this case, the pressing conditions are set so that the adhesive melts and spreads between the end surface a of the optical recording member 1 and the concave side surface b of the card substrate 2.

In the second method, first, a transparent protective layer 3 having a track pattern is prepared by using a resin such as polycarbonate or acrylic by a generally known injection method or casting method. At this time, the end surface a is formed to have a taper if necessary. Then, the surface hardened layer 6 is formed on the side opposite to the track pattern surface, and the optical recording layer 5 is formed on the track pattern surface. As the surface hardened layer 6 and the optical recording layer 5, the same ones as described above are used. On the other hand, a resin such as ABS resin or polyvinyl chloride is used to prepare the card substrate 2 by the injection method or the casting method. At this time, the concave portion 7 in which the optical recording member 1 is embedded is formed.
When the taper α is provided on the end surface a of the optical recording member 1, the concave side surface b is formed to be the same as the taper α of the end surface a of the optical recording member 1. Then, the concave portion 7 of the card substrate 2 is formed at a position passing through at least one of the center line x in the long side direction and the center line y in the short side direction of the card. In this case, the position of the recess 7 may be line symmetric with respect to the center line x, and may be line symmetric with respect to the center line y. In addition, painting is performed by in-mold molding.
Then, by the same method as described above, the card substrate 2
The optical recording member 1 is fixed in the concave portion 7 of the optical disk by an adhesive or a pressure sensitive adhesive.

The optical card of the type shown in FIGS. 1 to 3 is one in which the optical recording member 1 is embedded in an island shape, but as shown in FIG. 5, both ends of the optical recording member 1 are cut off to form a card base. It may be embedded in the material 2. When embedding in such a form, the card base material 2 is formed by counterboring.
When the concave portion 7 is formed on the substrate, even if the concave portion 7 is wide, it can be processed in one pass, so that the cost can be reduced. When TeOx or the like is used for the optical recording layer 5, the optical recording layer 5 at both end portions 1a of the optical recording member 1 is preferably omitted because the edge portions at both ends may be oxidized.
In this way, it looks like an island-shaped one.

In order to diversify the use of the optical card of the present invention, as shown in FIGS. 6 and 7, the same surface as the optical recording member 1 or the opposite surface or both surfaces of the card substrate 2 are used. The magnetic stripe 9 may be provided on the optical recording member 1, or the IC module 10 may be provided on the same surface as the optical recording member 1 or on the opposite surface. Further, it is of course possible to form card information such as a personal name and a registration number as embossed characters in areas other than the optical recording member by embossing.

[0023]

In the optical card of the present invention having the above-mentioned structure, the optical recording member and the recess of the card substrate in which the optical recording member is embedded pass through at least one of the longitudinal center line and the short side center line of the card. Therefore, the stress applied to the concave portion when the card is bent is prevented from being extremely biased. Especially,
The optical recording member embedded so as to be substantially line-symmetric with respect to the center line in the long side direction of the card functions to evenly distribute the stress generated during bending.

[0024]

【Example】

Example 1 First, a hard coat agent (manufactured by Toray, UH-00 manufactured by Toray Co., Ltd.) was spin-coated on one surface of a sheet-molded polycarbonate (transparent protective layer) having a thickness of 0.4 mm.
1) was applied to form a surface-hardened layer. Next, a guide track pattern was formed on the surface opposite to the surface-hardened layer by the 2P method, and TeOx was sputtered on the guide track pattern to form an optical recording layer. Then, on this optical recording layer, an adhesive (PPET-2101 manufactured by Toagosei) using a T-die was used.
Was applied in a thickness of 50 μm. Then, the end face was cut so as to have a taper of 10 ° and cut so as to be parallel to the track of the card, and an optical recording member having a width of 15 mm and a length of 80 mm was prepared.

On the other hand, two core sheets of 0.28 mm opalescent vinyl chloride are printed on one side with silk offset, and the non-printed side of these two core sheets is overlaid with a 0.10 mm oversheet. It was sandwiched by two sheets and heat-fused to prepare a four-layer card base material. A magnetic tape of 650 Oersted was formed on one surface of one oversheet, and a magnetic tape of 290 Oersted was formed on one surface of the other oversheet. Then, a recess was formed in the card base material by cutting to embed the optical recording member. That is, the side surface of the concave portion has a taper angle of 10 ° outward with respect to the vertical direction from the bottom surface of the card, and the optical recording member is 50
In addition to performing counterboring with a large size of μm, cutting of the end surface of the card base material was performed so that parallelism with the recess was obtained. In this case, counterboring was performed so that the position of the recess was in the center of the card substrate.

[0026] fit the optical recording member into the recess of the card substrate created above, using a flat press that matches the size of the optical recording member, 120 ° C., 2 under the conditions of 6 kg / cm ^2.
Heat pressing was performed for 5 seconds. This melts the adhesive,
The optical recording member could be bonded while covering the bottom surface and the end surface. Further, since vinyl chloride hitting the bottom surface of the optical recording member conducts heat from the top surface of the transparent protective layer (polycarbonate), there is no sagging due to the heat.

A bending test was conducted on the optical card produced as described above in accordance with the ISO bending test standard, but there was no problem.

Example 2 A patterned polymethylmethacrylate (surface protective layer) having a thickness of 0.4 mm was prepared by the casting method. At this time, the end face was designed to have a taper of 10 °. Next, a hard coating agent (made by Toray,
UH-001) was applied to form a surface hardened layer, and then TeOx was sputtered on the pattern surface to form an optical recording layer, thereby forming an optical recording member. The size of the optical recording member was 10 mm in width and 50 mm in length.

On the other hand, a card size of 0.78 mm thick was obtained by injection method using ABS resin.
A card base material having a recess for embedding the optical recording member was prepared. The recess had a depth of 0.45 mm and was formed such that the side surface thereof had a taper angle of 10 ° outward with respect to the vertical direction from the bottom surface of the card like the optical recording member. Further, the pattern was formed by in-mold molding. In this case, as shown in FIG. 7, the concave portions were formed so as to be substantially symmetrical with respect to the center line in the long side direction of the card base material, and to be offset to one short side.

Next, a UV curable adhesive (863 made by Kyoritsu Kagaku Sangyo Co., Ltd.) was dropped on the concave portion of the card substrate, an optical recording member was fitted into the concave portion, and the whole was pressed by a flat press, The adhesive was cured by irradiating with ultraviolet rays. At this time, the press conditions were set so that the adhesive was spread even on the end surface of the optical recording member. Further, adjacent to the optical recording member I
Embedded C module.

The optical card produced as described above was subjected to a bending test in accordance with the ISO bending test standard as in the case of the previous embodiment, but there was no problem.

[0032]

Since the present invention is constructed as described above, it has the following effects.

The position of the concave portion of the card base material in which the optical recording member is embedded passes through at least one of the center line in the long side direction and the center line in the short side direction of the card. Since the stress applied is not extremely biased, it is possible to obtain an optical card with improved strength against bending. In particular, in the case where the optical recording member is embedded so as to be substantially line symmetric with respect to the center line in the long side direction of the card,
When the card is bent, the stress applied to the recesses is evenly distributed, and the strength against bending becomes higher.

Since the adhesive layer between the optical recording member and the card substrate is provided not only on the bottom surface of the optical recording member but also on the end surface, an optical card with further improved bending strength can be obtained.

By providing the end surface of the optical recording member and the side surface of the concave portion of the card base material with the taper, the optical recording member can be easily embedded and the gap between the end surface of the optical recording member and the side surface of the concave portion of the card base material can be reduced. It will look good.

Since the optical recording member is embedded in a part of the card substrate, by utilizing the remaining area of the card substrate, an optical card of a form that could not be manufactured up to now, for example, a magnetic stripe is formed on both sides. Optical card,
It is possible to manufacture an optical card with embossing, an optical card in which the optical recording unit and the IC module are not on the same surface, an optical card capable of CP processing on both sides, and an optical card capable of transferring holograms on both sides.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of an optical card according to the present invention. .

FIG. 2 is a plan view showing a more preferable example of the optical card according to the present invention.

FIG. 3 is a plan view showing another example of the optical card according to the present invention.

FIG. 4 is a cross-sectional view showing an embedded state of an optical recording member in an optical card.

FIG. 5 is a plan view for explaining an optical card as another embodiment.

FIG. 6 is a perspective view showing an example of an optical card provided with a magnetic stripe on the same surface as an optical recording member.

FIG. 7 is a perspective view showing an example of an optical card in which a magnetic stripe and an IC module are provided on the same surface as an optical recording member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical recording member 2 Card base material 3 Transparent protective layer 4 Track pattern 5 Optical recording layer 6 Surface protective layer 7 Recessed portion 8 Adhesive layer 9 Magnetic stripe 10 IC module

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location G11B 7/24 571 F 7215-5D

Claims (10)

[Claims] 1. An optical recording member in which an optical recording layer is laminated so as to cover a track pattern provided on the back side of a transparent protective layer,
In an optical card which is embedded in a recess formed in a card base material via an adhesive layer, an optical recording member is embedded at a position passing through at least one of a center line in the long side direction and a center line in the short side direction of the card. An optical card that is characterized by being. 2. The optical card according to claim 1, wherein the optical recording member is embedded in a line symmetrical with respect to a center line in the long side direction of the card. 3. The optical card according to claim 1, wherein the optical recording member is embedded substantially symmetrically with respect to the center line of the card in the short side direction. 4. The optical card according to claim 1, wherein the adhesive layer between the optical recording member and the card substrate is present not only on the bottom surface but also on the end surface of the optical recording member. 5. The taper is provided on the end surface of the optical recording member and the concave side surface of the card substrate.
The optical card described in 2, 3, or 4. 6. The optical card according to claim 1, wherein the end surface of the optical recording member and the recess of the card substrate are formed by cutting. 7. The optical card according to claim 1, 2, 3, 4 or 5, wherein the optical recording member and the card substrate are produced by an injection method or a casting method. 8. The magnetic stripe is provided on the same surface as the optical recording member, on the opposite surface, or on both surfaces of the card substrate, according to claim 1, 2, 3, 4, 5, 6 or 7. Optical card. 9. The IC module is provided on the same surface as or an opposite surface of the optical recording member.
The optical card of 2, 3, 4, 5, 6, 7 or 8. 10. An area other than the optical recording member is embossed.
The optical card according to 6, 7, 8 or 9.