JP3616938B2 - Magnetic display card - Google Patents

Description

【００４３】
【発明の効果】
以上に述べた通り、本発明によれば、ＪＩＳＸ６３１１に規定されるプリペイドカードに対応でき、且つ、磁気記録層の記録状態あるいは磁気表示層の表示品質に影響を与えない磁気表示カードを提供することが可能となる。
【図面の簡単な説明】
【図１】本発明の好ましい実施の形態に係る磁気表示カードの層構造を示す概略断面図である。
【符号の説明】
１ 透明ＰＥＴ支持体
２ 印刷層
３ 磁気表示層
４ バックコート層
５ 白色ＰＥＴ支持体
６ 磁気記録層
７ 軟磁性層
８ 接着層
９ フレーク状磁性微粒子
１０ マイクロカプセル[0001]
BACKGROUND OF THE INVENTION
The present invention is a so-called prepaid card having a function of recording a certain value by a magnetic method or the like, and mechanically paying out each time a product is purchased / rented or provided with a service, and the record is updated. Magnetic display card with magnetic display function for magnetically recording information on a magnetic card, etc., and displaying the recorded information in a visible manner, especially reducing magnetic interference between the magnetic recording layer and the magnetic display layer In addition, the present invention relates to a magnetic display card that is excellent in contrast of display information and has sharp characters and image edges.
[0002]
[Prior art]
Conventionally, for example, the following has been proposed as this type of magnetic display card. A plurality of microcapsules containing liquids such as flaky magnetic fine particles and oil are dispersed and coated on an organic binder on a transparent substrate, and a microcapsule layer is provided. Further, black light is absorbed on the microcapsule layer. The magnetic display member provided with the layer is punched or cut into a desired shape. On the other hand, the magnetic display member is bonded and embedded in the concave portion of the PVC resin base having a thickness of about 0.76 mm, in which a concave portion is formed on the front surface and a magnetic recording layer is formed on the rear surface.
[0003]
The display of characters, graphics, and the like on the magnetic display layer is performed by controlling the reflection / transmission of light by orienting the flaky magnetic fine particles horizontally or vertically by applying a magnetic force. That is, light is reflected on the surface of the flaky magnetic fine particles by magnetically orienting the flaky magnetic fine particles parallel to the surface of the transparent base material to give a metallic luster color, and incident by aligning the flaky magnetic fine particles vertically. The light is transmitted through the capsule as it is to display black.
[0004]
[Problems to be solved by the invention]
However, in the configuration of the conventional magnetic display card, for example, when a magnetic pattern is written to the magnetic display layer or when a large number of sheets are stacked and stored, magnetic mutual interference between the magnetic recording layer and the magnetic display layer occurs. To do. For example, the residual magnetization of the flake-shaped magnetic fine particles in the magnetic display layer is affected by the magnetic flux of the magnetic recording layer, resulting in a decrease in the contrast of the magnetic display. There is a problem that information in the magnetic recording layer is destroyed by the influence of magnetic flux.
[0005]
Further, there is a problem that the residual magnetization of the magnetic recording layer is demagnetized due to the magnetic field at the time of repeated erasing and writing of the magnetic display layer, particularly the magnetic field at the time of erasing, and becomes unreadable.
[0006]
Therefore, the magnetic display layer can be provided only on a thick JISI-type or JISII-type magnetic card, so-called credit card or the like, in which the relative distance between the magnetic display layer on the front surface and the magnetic recording layer on the back surface is relatively long. A so-called prepaid card or the like (with JISX6311) having a function of recording a certain value by a magnetic method, etc., and having a function of renewing the record mechanically every time a product is purchased / rented or provided for service. It was impossible to meet the demand from the market to apply to
[0007]
In order to solve the above-mentioned problems, the particle size, saturation magnetization, coercive force and liquid viscosity of the flaky magnetic fine particles while balancing with the magnetic properties of the magnetic recording layer, and an organic binder that disperses a plurality of microcapsules, etc. Various studies have been made to optimize it. However, the magnetic display layer is difficult because it has high responsiveness to the magnetic pattern to be displayed visually and requires contradictory conditions to stably hold the obtained magnetic pattern image over time.
[0008]
The present invention has been made to solve such problems, and its technical problem is that there is no magnetic mutual interference between the magnetic recording layer and the magnetic display layer, the magnetic display layer is provided, and prepaid as defined in JIS X6311 is provided. It is an object of the present invention to provide a thin magnetic display card compatible with a card.
[0009]
[Means for Solving the Problems]
As a result of various investigations in order to achieve the above-described problems, a printed layer leaving a transparent part partially on the surface of the transparent flexible support, at least a liquid on the printed layer including the transparent part, and the liquid A magnetic display layer in which microcapsules containing flaky magnetic fine particles floating and sensitive to an external magnetic field are dispersed in an organic binder to form a magnetic display region, and at least a colored facial, a soft magnetic powder and an organic binder And a magnetic recording layer on one surface of a flexible support different from the transparent flexible support, and the other of the flexible support. A magnetic recording medium comprising a soft magnetic layer containing at least a soft magnetic powder and an organic binder on the surface of the magnetic display medium, the backcoat layer and the soft magnetic layer comprising the magnetic display medium and the magnetic recording medium. Opposite the adhesive layer It has been found that can be to resolve by constructing adhere the bonded.
[0010]
In the magnetic display card of the present invention, it is preferable that the main component of the soft magnetic powder in the backcoat layer is Fe.
[0011]
In the magnetic display card according to the present invention, the main component of the soft magnetic powder in the soft magnetic layer is preferably a Ni—Fe alloy or a Fe—Si—Al (aluminum) alloy.
[0012]
Furthermore, in the magnetic display card according to the present invention, it is preferable that the soft magnetic powder used for the back coat layer or the soft magnetic layer is a flat and / or acicular and / or granular powder.
[0013]
[Action]
The soft magnetic layer of the present invention has a configuration containing soft magnetic powder and an organic binder. That is, since the magnetic recording layer and the magnetic display layer are provided across the soft magnetic layer, the soft magnetic layer has a magnetic shielding effect on the magnetic recording layer and the magnetic display layer serving as a magnetic mutual interference source, Magnetic mutual interference is suppressed.
[0014]
Further, even when the display contents are erased, the soft magnetic layer has a magnetic shielding effect against the magnetic field from the erasing head of the magnetic display layer, so that demagnetization of the magnetization of the magnetic recording layer is suppressed.
[0015]
In addition, as a synergistic effect with the soft magnetic powder contained in the backcoat layer, the soft magnetic layer of the present invention efficiently does not disperse the magnetic lines of force generated from the write head to the magnetic display layer to the magnetic display layer. Can be vertical. That is, since the magnetic flux density passing through the microcapsule layer perpendicular to the magnetic display layer can be increased, there is also a function of increasing the relative contrast of light reflection / transmission of the magnetic display layer.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments will be described below, and the magnetic display card of the present invention will be described in detail. First, the basic configuration of the magnetic display card of the present invention will be described with reference to FIG. FIG. 1 is a schematic cross-sectional view showing a layer structure of a magnetic display card according to an embodiment of the present invention, which is partially formed on the surface of a transparent PET support 1 made of flexible polyethylene terephthalate (hereinafter referred to as PET). A magnetic layer comprising a microcapsule 10 containing at least oil and flaky magnetic fine particles 9 made of a flaky Fe-Ni alloy on the printed layer 2 with the transparent portion remaining on the printed layer 2 including the transparent portion, and an organic binder. A magnetic display medium comprising a display layer 3 and a backcoat layer 4 comprising at least a black pigment, Fe powder and an organic binder; and a magnetic recording layer 6 on one surface of a white PET support 5; A magnetic recording medium having a soft magnetic layer 7 containing at least a Fe—Si—Al alloy and an organic binder on the other surface of the support 5 is opposed to the back coat layer 4 and the soft magnetic layer 7. Are adhered the bonded via an adhesive layer 8.
[0017]
As the flaky magnetic fine particles 9 used for the microcapsule 10 in the present invention, use such as reflection / transmission or reflection / absorption of light, or a required relative contrast, or a flatness ratio after drying the microcapsule 10, or magnetic Although it can be arbitrarily selected depending on the required film thickness of the display layer 3 and the like, in order to stably enclose a simple substance in the microcapsule 10, it is preferable that the major axis is at least 100 μm or less. In order to improve the relative contrast characteristics of light, it is desired that the aspect ratio is 5 or more, preferably 10 or more. The material is not particularly limited as long as the above particle shape can be obtained, but it is necessary to have an appropriate coercive force capable of sufficiently responding to an applied magnetic field.
[0018]
In addition, as the liquid in the microcapsule 10, an oil having a desired viscosity and transparency may be selected in consideration of alignment response to a magnetic field, stability after alignment, and contrast characteristics. Further, an additive for adjusting viscosity or adjusting polarity may be mixed within a range that does not adversely affect the contrast characteristics of light.
[0019]
Furthermore, the coating material of the microcapsule is not particularly limited as long as it is transparent and has an appropriate strength against external force. Further, the particle size needs to enclose the magnetic fine particles as a single unit and allow the magnetic fine particles to freely rotate within the capsule. However, considering the reflection area during horizontal orientation, the interval between the magnetic fine particles is 2 to 10 μm. It is preferable to make the degree.
[0020]
The organic binder used for the magnetic display layer 3 in the present invention is not particularly limited as long as it has high transparency and desired durability in consideration of adhesion to the transparent PET support 1.
[0021]
As the transparent or white white PET support 5, for example, a plastic film such as polyethylene terephthalate, polyimide, polyester, polycarbonate, triacetylcellulose, nylon, cellophane, or the like can be used.
[0022]
Examples of the soft magnetic powder in the back coat layer 4 and the soft magnetic powder in the soft magnetic layer 7 that are one of the constituent elements of the present invention include Fe, Fe—Ni alloy (permalloy), Fe—Al—Si alloy (Sendust). ) As a typical material, and the aspect ratio of the powder is preferably sufficiently large (approximately 5 or more).
[0023]
Further, examples of organic binders that can be used to form the soft magnetic layer 7 include heat such as polyester resin, polyvinyl chloride resin, polyvinyl butyral resin, polyurethane resin, cellulose resin, nitrile-butadiene rubber, and styrene-butadiene rubber. Examples thereof include thermosetting resins such as plastic resins or copolymers thereof, epoxy resins, phenol resins, amide resins, and imide resins.
[0024]
【Example】
(1) Production of magnetic display medium Coacervate by gelatin-gum arabic, which is a conventionally known method, using Fe-Ni alloy fine particles and liquid paraffin having a coercive force of 10 (Oe) as raw materials after pulverizing in a ball mill. By the method, microcapsules having an average particle size of 70 μm were prepared.
[0025]
Next, after the microcapsules are mixed and dispersed with a polyvinyl alcohol solution to prepare a microcapsule ink, a portion (about 72 × 18 mm) to be a magnetic display portion is left on the transparent PET support 1 having a thickness of 50 μm in advance. After the pattern is printed, the magnetic display layer 3 is provided by applying with an applicator so that the thickness after drying is 70 μm. Further, the black ink made of black pigment and polyvinyl alcohol has a coercive force of 10 ( A backcoat paint was prepared by adding granular Fe powder of Oe) and applied with an applicator so that the thickness after drying was 20 μm, to provide a backcoat layer 4 to prepare a magnetic display medium.
[0026]
(2) Preparation of magnetic recording medium In advance, a coercive force of 650 (Oe) is applied by a conventionally known method so that the film thickness after drying and curing is 10 μm on one surface of a white PET support 5 having a thickness of 50 μm. After the recording layer 6 is provided, a flaky Fe—Al—Si alloy (average particle size 10 μm, aspect ratio 5, coercive force 10 (Oe)), polyurethane resin, curing agent (isocyanate compound) on the other surface A soft magnetic coating material composed of a solvent (mixture of cyclohexanone and toluene) is applied with an applicator so as to have a thickness of 20 μm after drying and curing, followed by curing at 65 ° C. for 50 hours to form the soft magnetic layer 7 A magnetic recording medium was prepared.
[0027]
(3) Preparation of magnetic display card An epoxy resin is applied to the surface of the back coat layer 4 of the magnetic display medium prepared in the above (1) and the soft magnetic layer 7 of the magnetic recording medium prepared in the above (2), and dried. The subsequent magnetic display card base was laminated so that the total thickness was 0.27 mm, and bonded to form a magnetic display card base.
[0028]
Next, the obtained magnetic display card base was punched into a size of 85 mm × 54 mm to prepare a magnetic display card sample.
[0029]
[Comparative example]
In the example, a magnetic display card sample was prepared in the same manner as in the example except that the magnetic display card substrate was prepared without providing the soft magnetic layer 7 on the magnetic recording medium.
[0030]
The magnetic display card samples prepared in the above examples and comparative examples are evaluated by the following procedures of Evaluation 1 and Evaluation 2.
[0031]
[Evaluation 1]
Procedure 1) In accordance with JIS X6302 (magnetic information recording format of credit card with magnetic stripe), on the magnetic recording layer of each magnetic display card sample, the "ALL-1" information is recorded in a saturated manner in advance, and reproduction is performed. The reproduction output voltage value (a) is measured.
[0032]
Procedure 2) The magnetic display layer of each magnetic display card sample is prepared with a commercially available apparatus having an eraser (erase horizontal magnetic field strength 800 (Oe)) of magnetic display information and a write unit (write vertical magnetic field strength 650 (Oe)). After erasing, write any sample display information.
[0033]
Step 3) Repeat step 2) a total of 10,000 times.
[0034]
Procedure 4) Similar to the above procedure 1), the magnetic recording layer of each magnetic display card sample is reproduced according to JlSX6302, and the reproduction output voltage value (b) is measured.
[0035]
Procedure 5) Reproduction output value ratio {reproduction output value (b) / reproduction output value (a)} × 100 of the obtained magnetic recording layer
Ask for.
[0036]
[Evaluation 2]
Procedure 1) A magnetic display layer of each magnetic display card sample is prepared using a commercially available apparatus having an erasing unit (erasing horizontal magnetic field strength 800 (Oe)) and a writing unit (writing vertical magnetic field strength 650 (Oe)) of magnetic recording information. After erasing and writing arbitrary sample character information, the thickness (A) of the written character is measured.
[0037]
Procedure 2) In accordance with JIS X6302 (magnetic information recording format of credit card with magnetic stripe), the magnetic recording layer of each magnetic display card sample is erased, and then “ALL-1” information is recorded in saturation.
[0038]
Step 3) Repeat step 2) a total of 10,000 times.
[0039]
Procedure 4) The thickness (B) of the character information written in the above procedure 1) is measured.
[0040]
Procedure 5) Character thickness ratio of the obtained magnetic display layer {character thickness (B) / character thickness (A)} × 100
Ask for.
[0041]
When evaluated as described above, the results shown in Table 1 below were obtained.
[0042]
[Table 1]

[0043]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a magnetic display card that can support a prepaid card defined in JIS X6311 and that does not affect the recording state of the magnetic recording layer or the display quality of the magnetic display layer. Is possible.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view showing a layer structure of a magnetic display card according to a preferred embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Transparent PET support 2 Print layer 3 Magnetic display layer 4 Backcoat layer 5 White PET support 6 Magnetic recording layer 7 Soft magnetic layer 8 Adhesive layer 9 Flaky magnetic fine particle 10 Microcapsule

Claims (5)

A printed layer leaving a transparent part partially on the surface of a transparent flexible support, and containing at least a liquid and flaky magnetic fine particles floating in the liquid and sensitive to an external magnetic field on the printed layer including the transparent part A magnetic display medium comprising a magnetic display layer in which microcapsules are dispersed in an organic binder to form a magnetic display region, and further a backcoat layer containing at least a color pigment, a soft magnetic powder and an organic binder;
Magnetic recording comprising a magnetic recording layer on one surface of a flexible support and a soft magnetic layer comprising at least a soft magnetic powder and an organic binder on the other surface of the flexible support. Medium and
A magnetic display card comprising the magnetic display medium and the magnetic recording medium, wherein the back coat layer and the soft magnetic layer are opposed to each other and bonded together through an adhesive layer. 2. The magnetic display card according to claim 1, wherein a main component of the soft magnetic powder in the backcoat layer is Fe. 2. The magnetic display card according to claim 1, wherein a main component of the soft magnetic powder in the soft magnetic layer is made of a Ni-Fe alloy. 2. The magnetic display card according to claim 1, wherein a main component of the soft magnetic powder in the soft magnetic layer is a Fe-Si-Al (aluminum) alloy as a main component. 5. The magnetic display card according to claim 1, wherein the soft magnetic powder used for the back coat layer or the soft magnetic layer is a flat and / or needle and / or granular powder. Magnetic display card characterized by

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