JP2010082863A - Magnetic card - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the spacing loss of a magnetic recording by a pattern formed on a magnetic recording section by shielding the magnetic recording section with a thin brightness structure so as to be seen through by forming a background printing section by a similar color of the magnetic recording section in the background of the magnetic recording section. <P>SOLUTION: In the recording card constituted by laminating front and back cover sheets of transparent resin films on a front uppermost surface and a back uppermost surface of a core sheet constituted of one or a plurality of resin films, a magnetic recording section is formed in a part of the exposed face of the front cover sheet, a solid state background printing section by the printing ink of the similar color in the magnetic recording section is formed in a card whole face in the boarder of the front cover sheet and the core sheet, the shielding layer by the brightness structure is formed so as to cover the magnetic recording section in the card whole face in the exposed face of the magnetic recording section of the front cover sheet, a printing pattern by a printing means, and a surface pattern by a light diffraction structure and a transfer pattern are individually or combinedly formed in the exposed face of the shielding face. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a magnetic card in which a magnetic recording portion is shielded with a thin film.

In recent years, cards equipped with a magnetic recording unit have been used in many fields such as bank cards, credit cards, membership cards, employee ID cards.
In Japan, a magnetic card (JIS X6301 and JIS X6302 compatible card) in which a band-shaped magnetic recording part is formed on the front side of the card is often used. The magnetic recording portion is often black or brown because of the magnetic material used. On the other hand, the front side of the card is the side on which the above-described magnetic recording unit is provided, and many readers read with the front side of the card facing up. Therefore, many cards are designed with company or organization logos on the front side.
A magnetic card is a small data carrier with a limited area, and the black and brown magnetic stripes enter it, which has a considerable influence on the card surface design.
Therefore, various methods for hiding the presence of the magnetic stripe have been proposed.
For example, in a card in which a concealing layer made of silver ink is provided on at least a part of a magnetic layer provided on at least one surface of the card, the silver ink contains granular aluminum powder having an average particle size of 7 μm or less in a binder resin. A magnetic layer concealment card prepared by dispersing in a silver concealment layer in which the ratio of the granular aluminum powder in the range of 5 to 30 wt% is further provided, and one or both of a colored layer and a pattern layer are formed on the concealment layer. A magnetic layer concealment card is provided (see, for example, Patent Document 1).

Japanese Patent No. 2773803

  The magnetic layer concealment card described in Patent Document 1 is characterized by concealing the presence of magnetic stripes with silver ink mixed with “5-30 wt%” of “granular aluminum powder” having an average particle size of 7 μm or less. It has become.

The “magnetic layer concealment card” according to “Magnetic layer concealment card and its manufacturing method” described in Patent Document 1 uses “granular aluminum powder” and overlaps “particulate aluminum powder” several times. This is an attempt to forcibly shield the magnetic layer.
Therefore, the present invention forms a background printing portion with a color similar to the magnetic recording portion on the background of the magnetic recording portion, shields the magnetic recording portion with a thin glitter structure that can be seen through, and depends on the pattern formed thereon. The object is to reduce the spacing loss of magnetic recording.

  In order to achieve the object, the first aspect of the magnetic card of the present invention is based on a resin film that is transparent on the outermost surface and the outermost surface of a core sheet composed of one or more resin films. A card in which front and back cover sheets are laminated, wherein a magnetic recording part is formed on a part of a front surface of the front cover sheet, and the magnetic recording part is formed on a whole surface of the card at a boundary between the front cover sheet and the core sheet. A solid background printing portion is formed with printing ink of approximate color, and a shielding layer with a glitter structure is formed on the entire surface of the card on the exposed surface of the magnetic recording portion of the front cover sheet so as to cover the magnetic recording portion. The exposed surface of the shielding layer is characterized in that a printed pattern by a printing means, a light diffraction structure, and a surface pattern by a transfer pattern are formed singly or in combination.

  Further, in the second aspect, in the first aspect, the shielding layer having the glitter structure is coarsely kneaded with fine powder containing an inorganic substance in a transparent resin and formed on the front cover sheet. It is characterized in that it is formed to such an extent that there is a transparent gap due to the resin.

  The third aspect is characterized in that, in the first or second aspect, a protective layer for protecting the surface pattern is further formed on the exposed surface of the surface pattern.

1) A card in which a front and back cover sheet made of a transparent resin film is laminated on the outermost surface and the outermost surface of a core sheet composed of one or a plurality of resin films, as in the first aspect, A magnetic recording part is formed in part on the exposed surface of the front cover sheet, and a solid background printing part using printing ink of an approximate color to the magnetic recording part on the entire surface of the card at the boundary between the front cover sheet and the core sheet Is formed on the exposed surface of the magnetic recording portion of the front cover sheet so as to cover the magnetic recording portion on the entire surface of the card with a bright structure, and printing means is provided on the exposed surface of the shielding layer. The printed pattern, light diffractive structure, and surface pattern by the transfer pattern are formed singly or in combination, and as in the second aspect, the transparent layer is transparent in the first structure. The fine powder containing inorganic substance in the resin is roughly kneaded and formed on the front cover sheet, so that a transparent gap due to the resin exists around the fine powder. The border of the magnetic recording portion formed in a band shape cannot be discriminated by the shielding layer having a thin glitter structure, and the design applied to the entire surface of the card is not divided by the magnetic recording portion.
If the shielding layer having the glitter structure is not formed, the boundary between the magnetic recording portion and the background printing portion can be slightly discriminated, and the design applied to the entire surface of the card is divided by the magnetic recording portion.
In addition, since the shielding layer with the glitter structure can be made as thin as possible, the spacing loss due to the pattern applied to the upper part (decrease in accuracy and output that occurs when recording / reading magnetic information on the magnetic recording part) To achieve reliable writing and reading.
2) Further, as in the third aspect, in the first or second aspect, a protective layer for protecting the surface pattern is further formed on the exposed surface of the surface pattern. And) good durability can be imparted to reading / writing of the magnetic recording portion where the surface pattern is repeatedly performed.

Hereinafter, an example of the magnetic card of the present embodiment will be described with reference to the drawings.
FIG. 1 is a diagram showing an example of a cross section of the magnetic card of the present embodiment cut in parallel to the short side, FIG. 2 is an enlarged view of the periphery of the magnetic recording unit in FIG. 1, and FIG. FIG. 4 is a diagram for explaining an example of a head gap and a spacing loss.

With reference to FIG. 1, an example of a cross section obtained by cutting the magnetic card of the present embodiment parallel to the short side will be described.
The magnetic card 100 according to the present embodiment is shown as a single core sheet 1 in FIG. 1, but the core sheet 1 may be composed of a plurality of resin films. The material used for the core sheet 1 may be transparent or colored with a coloring pigment.
A front cover sheet 11 and a back cover sheet 12 made of a transparent resin film are laminated on the outermost surface and the outermost surface of the core sheet 1.

When determining the configuration of the core sheet and the cover sheet, care should be taken so that curling does not occur by selecting materials so as to be vertically symmetrical with respect to the center of the cross section of the card.
For example, when the number of core sheets is an even number, the core sheets are arranged so that the top and bottom of the core sheets have the same thickness relative to the center of the cross section. When the core sheet is an odd number, sheets having different thicknesses are arranged at the center, and sheets having the same thickness are arranged above and below the sheets.
The front and back cover sheets are often composed of one sheet of the same thickness, but can be composed of a plurality of sheets. When multiple front cover sheets are used (a on the top surface side and b on the side close to the center) as described above, the back cover sheet should be the same thickness as the front and the center of the card cross section And a and b are arranged symmetrically.

  A magnetic recording portion 7 is partially formed on the exposed surface of the front cover sheet 11. The magnetic recording unit 7 is formed on the front cover sheet by a method such as printing, coating, or transfer. It may be formed by being bonded to a cover sheet together with a thin base film on which a magnetic recording layer is formed.

At the boundary between the front cover sheet 11 and the core sheet 1, a background printing portion 5 is formed on the entire surface of the card with the magnetic recording portion 7 and printing ink of an approximate color.
The background printing unit 5 prints on the surface of the core sheet 1 or the front cover sheet 11 in a solid form (a state where the entire printing unit is covered with printing ink) and has the same density as the color of the magnetic recording unit 7. Adjust the ink thickness (fill amount) as follows.
When the background printing part 5 is printed by the offset method or the relief printing method, a non-printing part is provided at the edge of the card, or an adhesive layer is provided above and below the printing ink layer.
When the background printing unit 5 is formed by flexo or screen printing, a binder resin that adheres to the front cover sheet 11 and the core sheet 1 is selected.

On the exposed surface of the magnetic recording portion 7 of the front cover sheet 11, a shielding layer 2 having a glitter structure is formed on the entire surface of the card so as to cover the magnetic recording portion 7. The glitter structure will be described in detail with reference to FIG.
On the exposed surface of the shielding layer 2, the surface pattern 4 is formed by printing or a light diffraction structure by a method such as transfer, alone or in combination. Moreover, the protective layer 3 for protecting the surface symbol 4 is formed on the exposed surface of the surface symbol.
These shielding layer 2, surface pattern 4, and protective layer 3 are formed sequentially on a transfer substrate, for example, a polyester sheet, and may be formed by heat transfer together when the core sheet and the front and back cover sheets are laminated. is there.

In addition, the design of the back surface is printed at the boundary between the core sheet 1 and the back cover sheet 12.
Printing of the back pattern by design, characters, ruled lines, etc. is performed by methods such as offset printing, letterpress printing, flexographic printing, and screen printing.

With reference to FIG. 2, the shielding layer 2 having a glitter structure will be described.
Here, “brilliant structure” can also be referred to as “lame structure”, and the surface printed with ink in which bright fine powder is kneaded has a textured state like a woven fabric in which gold thread and silver thread are woven. The structure to be realized.
In the shielding layer 2 having a glitter structure, fine powder 21 containing an inorganic substance is kneaded in a transparent resin in a “rough state”. And in the state formed on the front cover sheet | seat 11, the periphery of the fine powder 21 is in the state in which the clearance gap by transparent resin exists.
If the shielding layer having the glitter structure is not formed, the boundary between the belt-like magnetic recording portion and the background printing portion can be discriminated sharply (can be clearly distinguished depending on the viewing angle), but the shielding layer 2 having the glitter structure can be used. Therefore, the boundary of the magnetic recording portion formed in a band shape cannot be discriminated by the shielding layer 2 having a thin glitter structure, and the design applied to the entire surface of the card is not divided by the magnetic recording portion. .

  As described above, the shielding layer 2 having the glitter structure is formed on the front cover sheet 11 with the fine powder 21 containing the inorganic substance in a “rough state”, and there is a gap between the fine powder 21 and the transparent resin. Therefore, the color of the magnetic recording portion 7 is not completely blocked, and the front cover surface 11 of the card is changed to a brilliant color close to the color of the magnetic recording portion 7 and formed on the front cover sheet 11 in a band shape. The presence of the magnetic recording unit 7 thus made cannot be determined.

The shielding layer 2 having a bright structure has a structure in which, as a fine powder 21, for example, fine pieces of glass, fine pieces obtained by pulverizing a rainbow hologram, fine pieces of aluminum, or the like are dispersed in a transparent binder resin.
Both the glass pieces and the rainbow hologram pieces are crushed after forming a thin metal film on transparent glass or transparent resin. Since the metal thin film is formed by a method such as vapor deposition, sputtering, or chemical plating, it reflects light even with a fine powder.
Further, when aluminum powder or the like is used as the fine powder 21, it may be scale-like or granular, and it only needs to have a surface that reflects incident light.

Returning to FIG. 2, the behavior of the light incident on the surface of the magnetic card according to the present embodiment will be described and it will be difficult to determine the presence of the magnetic recording unit.
At the boundary between the front cover sheet 11 and the core sheet 1, a background printing portion 5 is formed on the entire surface of the card with the magnetic recording portion 7 and printing ink of an approximate color. On the exposed surface of the magnetic recording portion 7 of the front cover sheet 11, a shielding layer 2 having a glitter structure is formed on the entire surface of the card so as to cover the magnetic recording portion 7.
On the exposed surface of the shielding layer 2, the surface pattern 4 is formed by printing or a light diffraction structure by a method such as transfer, alone or in combination. A protective layer 3 for protecting the surface symbol 4 is formed on the exposed surface of the surface symbol.
The light a incident from the surface of the protective layer 3 is reflected in the direction a ′ by the fine powder 21 of the shielding layer 2. On the other hand, the light b incident from the surface of the protective layer 3 goes through the gaps of the fine powder 21 of the shielding layer 2, passes through the transparent resin and the front cover sheet 11, is reflected by the background printing unit 5, and is reflected on the surface of the magnetic recording unit. It returns as an approximate color.
In this way, light az (not shown) incident from the surface of the protective layer 3 is reflected by the fine powder 21 and returned to the eyes, and is incident from the gap between the fine powder 21 and reflected by the background printing unit 5. It is divided into the returning light, the light that is reflected by the fine powder 21 and does not return to the eyes, and the light that does not return from the gap between the fine powder 21, so that the boundary portion of the magnetic recording unit 7 cannot be discriminated as a whole.

The spacing loss of magnetic recording will be described with reference to FIG.
FIG. 4A schematically shows a case where recording is attempted by bringing a magnetic head directly into contact with the surface of the magnetic recording material. In this case, the spacing loss is “zero”.
The state shown in FIG. a corresponds to the case of direct magnetic recording on the outermost surface 111 of the magnetic recording portion in FIG.
The magnetic head 9 magnetizes the magnetic recording unit by winding a coil around a magnetizable core material having a C or U shape and causing a direct current to flow through the coil instantaneously.
The magnetic material used for the magnetic card is a magnetic material in which a portion magnetized by the magnetic head remains as residual magnetism.
Current is passed from the c terminal of the coil of the magnetic head 9 in the direction of the d terminal to record “1”, and current is passed from the d terminal to the direction of the c terminal to record “0”. This is used properly instantly, and eight magnetized areas 71 (8 bits) are recorded to express characters. For example, “10000111” or “00000111” is recorded to express the number “7” (recording method by one track).
The head is selected according to the magnetic recording density. When the recording density is increased (the number of bits per unit length is large), a head having a narrow head gap is used. When the recording density is high (head gap is narrow), the magnetized region 71 becomes shallow. Therefore, when the recording density needs to be further increased, the thickness of the magnetic layer is reduced to increase the recording accuracy.

FIG. b schematically shows a case where a gap (shield layer 2 + surface pattern 4 + protective layer 3) is interposed between the surface of the actual magnetic recording material and the contact surface of the magnetic head. In this case, a spacing loss “(shielding layer 2 + surface pattern 4 + protective layer 3)” occurs.
The state shown in FIG. b corresponds to the case of magnetic recording from above the protective layer 3 in FIG. 2, and the spacing loss is generated in proportion to the distance from the magnetic recording portion outermost surface 111 to the head gap surface of the magnetic head. .
If the magnetic head of FIG. A is used as it is in the state where the spacing loss has occurred and recording is attempted on the magnetic recording portion, the magnetized area becomes wide as shown in FIG. B, and recording is performed at the same recording density as in FIG. In this case, a part of the adjacent magnetized area overlaps and the recording accuracy is lowered.
Conversely, when magnetic information recorded with high accuracy is read in the presence of a spacing loss, it must be read in a state where sufficient output cannot be obtained. The recording part recorded in such a state is often recorded in an unstable state.

An example of the head gap and the spacing loss will be described with reference to FIG.
Although different depending on the characteristics of the magnetic head, FIG. 4 shows how the gap size and the space affect the read output when the magnetic head having the same characteristics is used.
Three types of magnetic heads with head gaps of 0.3 mm, 0.1 mm, and 0.03 mm are magnetized in a state where there is no spacing loss (the state shown in FIG. 3a), and the gap shown in FIG. Space) is set from “0 μm” to “50 μm”, and the decrease in the read output is expressed in%.
As can be seen from the figure, the output reduction rate increases as the head gap becomes narrower and the space becomes larger.

From the above, in order to increase the magnetic recording accuracy (write output, read output, write accuracy), it is necessary to make the space (shield layer 2 + surface pattern 4 + protective layer 3) in FIG. Recognize.
Among the gaps, the thickness of the shielding layer 2 occupies a large weight, and it is necessary to reduce the thickness of the shielding layer 2 in order to improve the magnetic recording accuracy.

(material)
The materials used will be described with reference to part of FIG.
The core sheet 1, the front cover sheet 11, and the back cover sheet 12 are resin films such as biaxially stretched polyethylene terephthalate, polyethylene terephthalate (PET-G) copolymerized with cyclohexanedimethanol, polycarbonate, ABS, polypropylene, and polyvinyl chloride. And a resin (core sheet 1) obtained by mixing these resins with a white inorganic pigment or the like. The thickness is selected from those having a thickness of 25 to 500 μm.
The magnetic recording part of the card specified in JIS X6301 (Type II) is transferred or pasted with a magnetic tape using a magnetic material having a high holding force of 600 to 700 Oersted, or directly on the front cover sheet. Use by coating. In addition, the magnetic recording part of other cards is used by transferring or laminating magnetic tape using a magnetic material having a holding power of 300 Oersted and 1000 to 3000 Oersted, or directly coating the front cover sheet. To do. The thickness of the magnetic recording layer is about 15 to 30 μm except for the adhesive layer (not shown).
For the background printing section 5, the back design by printing, and the front design by printing, a commercially available offset printing ink, relief printing ink, screen printing ink, flexographic printing ink, etc. are selected and used in accordance with the printing method. When a transfer pattern is used, the printing is performed on a transfer paper or transfer film and transferred onto the shielding layer.
The light diffractive structure is used by thermally transferring a hologram or the like produced by a known method to the entire surface or a part thereof.
The thickness of the surface pattern is about 1 to 3 μm.

For the shielding layer 2, as a fine powder in a transparent medium such as offset ink, screen ink, flexo ink, etc., for example, a transparent glass powder deposited with aluminum or the like, a crushed transparent acrylic resin deposited with aluminum, a hologram, etc. An ink is used in which a transparent glass powder obtained by vapor-depositing aluminum or the like, or a powder obtained by pulverizing a transparent acrylic resin or the like is dispersed and kneaded. In addition to the above, ink in which scaly or granular aluminum powder is dispersed and kneaded is used as fine powder. The aluminum may use other metals such as nickel, chromium, titanium, copper, silver, gold, magnesium, tin and the like. The size of the fine powder 21 is 0.5 to 1.5 μm, and the thickness of the shielding layer 2 is about 2 to 5 μm.
Examples of the resin binder constituting the protective layer 3 include cellulose resins, polyvinyl butyral resins, epoxy resins, phenol resins, polyester resins, polyurethane resins, acrylic resins, methyl methacrylate homopolymers and copolymers, and melamine resins. Use a mixture. Furthermore, soybean lecithin, a phthalic acid plasticizer, microsilica, wax, or the like can be added to the protective layer as a film modifier as necessary. Further, a curing agent such as a polyisocyanate compound is added to crosslink between the resin binder molecules.
The thickness of the protective layer is about 0.5 to 2 μm.

  It can be used for cards specified in JIS X6301, such as bank cards, credit cards, membership cards, employee ID cards.

It is the figure which showed an example of the cross section which cut | disconnected the magnetic card of this Embodiment in parallel with the short side. It is the figure which expanded the periphery of the magnetic-recording part of FIG. It is a figure for demonstrating the spacing loss of magnetic recording. It is a figure for demonstrating an example of a head gap and a spacing loss.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Core sheet 2 Shielding layer 3 Protective layer 4 Front surface pattern 5 Background printing part 6 Back surface pattern 7 Magnetic recording part 9 Magnetic head 11 Front cover sheet 12 Back cover sheet 21 Fine powder 71 Magnetized area 91 Head gap 100 Magnetic card 111 Magnetic recording part most surface

Claims (3)

A card in which a front and back cover sheet made of a transparent resin film is laminated on the outermost surface and the outermost surface of a core sheet composed of one or a plurality of resin films,
A magnetic recording part is formed in part on the exposed surface of the front cover sheet,
At the boundary between the front cover sheet and the core sheet, a solid background printing portion is formed on the entire surface of the card with printing ink of an approximate color with the magnetic recording portion,
On the exposed surface of the magnetic recording portion of the front cover sheet, a shield layer with a glitter structure is formed on the entire surface of the card so as to cover the magnetic recording portion,
The magnetic card according to claim 1, wherein a printed design by a printing means, a light diffraction structure, and a surface design by a transfer design are formed singly or in combination on the exposed surface of the shielding layer. The magnetic card according to claim 1,
The shielding layer with the glitter structure has a structure in which fine powders containing inorganic substances are dispersed in a transparent resin, and in the state formed on the front cover sheet, there are gaps due to the transparent resin around the fine powders. A magnetic card characterized by being formed. The magnetic card according to claim 1 or 2,
Further, a magnetic card, wherein a protective layer for protecting the surface design is formed on the exposed surface of the surface design.

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