JP2000030026A - Information recording medium - Google Patents

Abstract

(57) [Summary] [Problem] A reader / writer for an information recording medium having high visibility and high repetition resistance, and a function capable of writing necessary information to the memory polymer dispersed type liquid crystal display unit. An information recording medium having: Kind Code: A1 A recording medium having a data recording portion by magnetic recording on a support or a recording medium having data recording or arithmetic capability by incorporating an IC chip, and both a magnetic recording and a recording by an IC chip. The memory-type polymer dispersed liquid crystal display unit 1 capable of displaying a part of the electronic information in the magnetic recording and / or the IC or information irrelevant to the information in the card-shaped recording medium having And an electrode 13 necessary for driving the memory polymer dispersed type liquid crystal display unit 1 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording medium capable of magnetic recording, an information recording medium capable of recording or calculating information by an IC chip, and an information recording medium having a combination of these techniques. Yes, furthermore, credit cards, cash cards, point cards, tickets, commuter passes, tickets, passbooks, identification cards and ID cards such as student IDs, permits such as licenses, tags, keys, The present invention relates to a guarantee card or the like and cards having a combination of these functions.

[0002]

2. Description of the Related Art Conventionally, in various card fields,
In particular, in the case of cards having a thickness such as a PVC card, in order to confirm information recorded in a magnetic recording portion or an IC, the card cannot be confirmed unless the card is inserted into a reader.

[0003] However, in order to solve such a problem, in the case where information in a storage element is changed in an information recording medium in which characters and images are already displayed on the surface of the medium, the information is not changed. Instead of discarding the recording medium, we will also change the content of the display on the information recording medium surface,
It is most efficient to use it as a new one.

[0004] However, it is difficult to change the contents of display methods such as a thermosensitive coloring method, a heat-sensitive transfer method, an electrophotographic method, and a sublimation transfer method which have been studied in the past, and are suitable for such uses. Absent.

Further, as a method for changing the display contents, there is a method in which information written on a magnetic tape is displayed by a magnetic powder in which magnetic ink is sealed in a microcapsule or a combination of a magnetic powder and a magnetic tape. Some systems have been proposed, such as a reversible recording material comprising a mixture of a low-molecular organic compound and a resin.

However, these systems do not always have sufficient characteristics for required surfaces such as visibility, repetition durability and color display. Therefore, by using a memory-dispersed polymer-dispersed liquid crystal display medium as a new display recording unit corresponding to these, it is possible to obtain high visibility, high repetition resistance, and simultaneously obtain the possibility of color display. it can.

[0007]

The present invention relates to an information recording medium capable of magnetic recording, an information recording medium capable of recording or calculating information by an IC chip, and an information recording medium having a combination of these techniques. Things,
Furthermore, credit cards, cash cards, point cards, tickets, commuter passes, tickets, passbooks, ID cards such as student ID cards, ID cards, permits such as licenses, tags, keys, guarantees, etc. And, in the field of cards having these functions in a complex manner, using a memory-dispersed polymer-dispersed liquid crystal display unit having high visibility, high repetition resistance, and capable of enabling color display at the same time, An electrode portion for driving the memory polymer dispersed type liquid crystal display is provided in a portion which does not affect the card design, and a reader / writer for the card-shaped information recording medium is used for the memory polymer dispersed liquid crystal display. An object of the present invention is to provide an information recording medium having a function of writing necessary information.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the present invention according to claim 1 has a recording medium having a data recording portion by magnetic recording on a support. In a recording medium having a data recording or calculating capability by incorporating a medium or an IC chip, and a card-shaped recording medium having both magnetic recording and recording by an IC chip, the magnetic recording and / or
And a memory polymer dispersed liquid crystal display capable of displaying a part of electronic information in the IC or information unrelated to the information, and driving the memory polymer dispersed liquid crystal display. The electrodes necessary for this purpose are provided on the end face of the card.

According to a second aspect of the present invention, there is provided the information recording medium according to the first aspect, wherein the memory polymer dispersed type liquid crystal display is buried in a card-shaped recording medium. Medium.

According to a third aspect of the present invention, in the information recording medium according to the first aspect, when information is recorded on the memory-type polymer-dispersed liquid crystal display section, a heat is applied by applying a voltage and simultaneously irradiating a laser beam. An information recording medium characterized by utilizing energy.

According to a fourth aspect of the present invention, in the information recording medium according to the first to third aspects, a plurality of electrodes for driving the memory polymer dispersed type liquid crystal display section are provided on at least the card-shaped information recording medium. An information recording medium characterized by being divided into two or more end faces.

According to a fifth aspect of the present invention, there is provided the information recording medium according to the first to fourth aspects, wherein the memory-type polymer-dispersed liquid crystal display section is capable of multicolor display or full-color display. It is a recording medium.

As a display material of the memory polymer dispersed type liquid crystal display portion used in the present invention, a liquid crystal composed of a nematic liquid crystal, a chiral nematic liquid crystal, a cholesteric liquid crystal, a smectic liquid crystal, or the like is formed into a polymer. What was trapped in the state (USP 4
6771618), or those in which a network polymer is formed in a liquid crystal continuous layer (USP 5,304,323), and those in which liquid crystals are dispersed in a polymer in a state of being encapsulated in microcapsules (USP 4,435,407). Can be.

Here, a liquid crystal display using a nematic liquid crystal or a smectic liquid crystal generally displays an image due to a difference between a transparent state in which light is transmitted and a cloudy state in which light is scattered. The used one can display an image depending on a difference between a transparent state transmitting light and a reflection state selectively reflecting light in a specific wavelength range.

In addition, color display can be performed using colors obtained from the characteristics of the liquid crystal itself or colors obtained by adding dyes or pigments to the liquid crystal, and further, these layers can be formed in a complex manner. By combining them, multi-color (multi-color) display or full-color display can be performed.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the memory polymer dispersed type liquid crystal display and the card-shaped information recording medium having the memory polymer liquid crystal display will be described in more detail with reference to the drawings. .

FIG. 1 shows the basic structure of a memory polymer dispersed type liquid crystal display (1), in which a polymer is sandwiched between a substrate (11) having a transparent conductive thin film (12). A dispersion type liquid crystal layer (14) is provided, and an electrode portion (13) is provided in contact with only the upper and lower transparent conductive thin films (12). Include a colored layer (15) and a reflective layer (1).
By providing 5), visibility can be improved. Further, the memory polymer dispersed type liquid crystal display (1)
An adhesive layer may be provided in order to impart adhesiveness to the card base material (2).

However, the colored layer (15) or the reflective layer (15) provided here does not necessarily have to be the back surface of the substrate (11) having the transparent conductive thin film (12). ) And the base material (11), a colored layer or a reflective layer may be provided. Further, a conductive colored layer (15) or a reflective layer (15) is provided on the lower base material (11). By providing the transparent conductive film, a structure in which a transparent conductive film is not provided thereon can be employed.

The electrode portion (13) in contact with the transparent conductive thin film (12) is formed by a printing method using conductive ink,
Any material having conductivity such as a metal foil may be used, and there is no particular limitation on the material.

Here, as the base material (11) of the memory polymer dispersed type liquid crystal display (1), if it is transparent, has a certain degree of rigidity and can form a conductive thin film (12) layer. Well, polyethylene terephthalate, polymethyl methacrylate, polyacrylate, polyester, polyvinyl chloride, polyvinylidene chloride, polypropylene, polycarbonate, ABS, nitrocellulose, polyethylene naphthalate, polyamide, nylon, polyurethane, polystyrene, etc. can be used. However, the present invention is not limited to these.

Further, as the liquid crystal material used for the display material of the memory polymer dispersed type liquid crystal display, nematic liquid crystal, chiral nematic liquid crystal / cholesteric liquid crystal,
A smectic liquid crystal or the like can be used.

Specifically,

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[0023]

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[0024]

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[0025]

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[0026]

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[0027]

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And the like, but are not limited thereto.

As the resin for dispersing these liquid crystal materials, a photocurable resin capable of forming a crosslinked structure by irradiation with light such as ultraviolet rays or irradiation of an electron beam, or a thermosetting resin capable of forming a crosslinked structure at room temperature or by heating. It is possible to use a mold resin and the like, and specific examples include the following resins. A urethane acrylate oligomer, an epoxy acrylate oligomer, a polyester acrylate oligomer, a special polyester, a linear acrylic oligomer, an acrylate monomer, an epoxy resin, a urethane resin, or the like can be used alone or as a mixture of a plurality of components. It is not limited to the above resin.

The material used for the transparent conductive thin film (12) necessary for driving the polymer dispersed liquid crystal layer (14) obtained by the above configuration is a transparent conductive material having conductivity. SnO ₂ , In ₂ O ₃ , IT
A thin film formed by vapor deposition or sputtering of O or the like can be used, but is not limited thereto.

The material of the electrode portion (13) provided in contact with the transparent conductive thin film (12) formed as described above includes carbon particles, aluminum, copper, tin, nickel, and the like.
It is provided by applying an ink or paste mixed with metal particles such as iron, cobalt, gold, silver, lead, and zinc, and particles of a conductive material such as SnO ₂ , In ₂ O ₃ , and ITO. , Tin, nickel, iron, cobalt, gold, silver, lead, zinc and the like.

The coloring layer or the reflecting layer (15) provided for improving the visibility of the memory polymer dispersed type liquid crystal display section may be an ink layer containing various pigments and dyes, aluminum, tin, or the like. Metals such as copper and gold formed by a vapor deposition method, a sputtering method, or the like can be used.

FIGS. 2 and 3 show the memory polymer-dispersed liquid crystal display (1) thus obtained, provided on a card substrate (2). Here, FIG.
Indicates that a memory polymer-dispersed liquid crystal display (1) is provided on the surface of the card base material (2) and is processed so as to be flush with the card base material (2). An adhesive layer can be provided between the polymer-dispersed liquid crystal display (1) and the card substrate (2) in order to improve the adhesiveness between them.

FIG. 3 shows a structure in which the memory polymer-dispersed liquid crystal display (1) is provided between an oversheet (21) and a core sheet (22) constituting a card base material. By taking such a structure, by external pressure etc.
It is possible to prevent tampering such as erasure of information displayed on the memory polymer dispersed type liquid crystal display (1).

FIG. 4 shows an information recording medium having a memory polymer dispersed type liquid crystal display section (1) provided in a card base material.
FIG. 4 is a diagram illustrating a recording method when information is recorded on the memory polymer dispersed type liquid crystal display unit (1). As a method for recording information, the liquid crystal of the memory polymer dispersed type liquid crystal display section (2) is heated by applying a voltage from the external electrode (4) and irradiating a laser beam (3) at the same time. Is what you do.

The external electrodes (4) used here are iron, stainless steel, nickel, copper, gold, aluminum, tin,
Although terminals such as lead and carbon can be used, it is preferable to use an elastic conductive material such as a conductive rubber that can easily contact the electrode (13) provided on the end face of the card-shaped information recording medium. It is desirable to use materials. Thereby, the adhesion between the external electrode (4) and the electrode (13) of the card-shaped information recording medium is improved, and it is possible to avoid printing defects.

[0037]

EXAMPLES The present invention will be described in detail with reference to examples.

Example 1 Transparent PET with a thickness of 38 μm
Conductive ink containing carbon as the main material is printed on one side of the film in a pattern corresponding to the formation of the memory polymer dispersed liquid crystal layer, and the conductive ink is applied thereon by screen printing to a thickness of about 20 μm. Pattern printing was performed with the thickness. A liquid crystal paint having the following composition was applied on the conductive pattern surface of one side of the base material thus obtained using an applicator to obtain a film thickness of about 20 μm. [Liquid crystal paint] 2-hydroxyethyl methacrylate 50 parts Cyanobiphenyl-based liquid crystal 50 parts On the liquid crystal material coating layer thus obtained, a thickness of 38
A transparent PET film with a thickness of 1 µm was etched on a single side with ITO deposited on the base, and etched with a pattern corresponding to the formation of a memory polymer dispersed liquid crystal layer on the deposited side. One side of the substrate on which the ink was pattern-printed to a thickness of about 20 μm by screen printing
The TO vapor-deposited surfaces were overlapped, and ultraviolet light of 800 mJ / cm ² was irradiated thereon from there using a high-pressure mercury lamp to obtain a memory polymer dispersed liquid crystal display unit.

An adhesive was applied to the back surface of the obtained memory polymer dispersed liquid crystal display, and an adhesive for laminating was applied. Then, a depression was formed on a 0.56 mm thick white PVC core sheet. After being placed, a 0.1 mm thick PVC oversheet was superimposed on both sides thereof, and heat lamination was performed at about 100 ° C. to obtain a card-shaped molded product.

A sample was obtained in which electrodes were formed by screen printing on both end surfaces on the short side of the card-like molded product. Electrodes made of conductive rubber were pressure-bonded to both ends, and a voltage of about 20 V was applied. No significant change was observed in the transmittance of the memory polymer dispersed type liquid crystal display, but the
Using a semiconductor laser of 0 mW, about 30 mm / s
When scanning was performed at a speed of ec, it was recognized that the transmittance of the liquid crystal in the laser-irradiated portion significantly changed.

[0041]

According to the present invention, in an information recording medium capable of magnetic recording, an information recording medium capable of recording or calculating information by an IC chip, and an information recording medium having a combination of these techniques, Credit cards, cash cards, point cards, tickets, commuter passes, tickets, passbooks, identification cards and ID cards such as student IDs, permits such as licenses, tags, keys, guarantees, etc. In the field of cards having multiple functions, the use of a memory-dispersed polymer-dispersed liquid crystal display medium in the display unit enables high visibility, high repetition resistance and color display at the same time. An information recording medium that can be provided can be provided.

Further, an electrode portion for driving the memory polymer dispersed type liquid crystal display medium is provided at a portion which does not affect the card design, and at the same time, an electrode terminal is provided in the reader / writer for the card-shaped information recording medium. By providing the information recording medium, information can be easily rewritten and visualized, and an information recording medium having a highly convenient function can be provided.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing an example of a card-shaped information recording medium of the present invention.

FIG. 2 is a cross-sectional view of a configuration of a memory polymer dispersed type liquid crystal display section taken along line xx in FIG.

FIG. 3 is a side view of the card-shaped information recording medium of FIG. 1;

FIG. 4 is a side view of a card-shaped information recording medium which is another example of the present invention.

FIG. 5 is a cut surface illustrating a printing method for a card-shaped information recording medium of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Memory polymer dispersion type liquid crystal display part 2 ... Card base material 3 ... Semiconductor laser 4 ... External electrode 11 ... Base material 12 ... Transparent conductive thin film 13 ... Electrode part 14 ... Polymer dispersion type liquid crystal layer 21 ... Oversheet 22 ... Core sheet

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G06K 19/00 B

Claims (5)

[Claims] 1. A recording medium having a data recording portion by magnetic recording on a support or a recording medium having a data recording or arithmetic capability by incorporating an IC chip. In a card-shaped recording medium having both, a memory polymer dispersed liquid crystal display unit capable of displaying a part of the electronic information in the magnetic recording and / or the IC or information unrelated to the information is provided. An information recording medium, wherein an electrode necessary for driving the memory polymer dispersed type liquid crystal display section is provided on an end face of the card. 2. The information recording medium according to claim 1, wherein
An information recording medium comprising a memory polymer dispersed liquid crystal display section embedded in a card-shaped recording medium. 3. The information recording medium according to claim 1, wherein
An information recording medium characterized in that when recording information on a memory polymer dispersed type liquid crystal display section, a voltage is applied and at the same time heat energy by laser beam irradiation is used. 4. The information recording medium according to claim 1, wherein a plurality of electrodes for driving the memory polymer dispersed type liquid crystal display section are divided into at least two or more end faces of the card-shaped information recording medium. An information recording medium comprising: 5. The information recording medium according to claim 1, wherein the memory-type polymer-dispersed liquid crystal display section is capable of multicolor display or full-color display.