JP4836899B2 - Magnetic striped array sheet, RFID magnetic sheet, electromagnetic shielding sheet, and manufacturing method thereof - Google Patents

Magnetic striped array sheet, RFID magnetic sheet, electromagnetic shielding sheet, and manufacturing method thereof Download PDF

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JP4836899B2
JP4836899B2 JP2007222952A JP2007222952A JP4836899B2 JP 4836899 B2 JP4836899 B2 JP 4836899B2 JP 2007222952 A JP2007222952 A JP 2007222952A JP 2007222952 A JP2007222952 A JP 2007222952A JP 4836899 B2 JP4836899 B2 JP 4836899B2
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magnetic
stripe
sheet
region
pattern
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JP2008103691A (en
JP2008103691A5 (en
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貴志 一柳
誠一 中谷
嘉久 山下
浩一 平野
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パナソニック株式会社
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  The present invention relates to a magnetic stripe arrangement sheet in which magnetic substances are arranged in a predetermined stripe pattern such as a linear shape or a lattice shape. The present invention also relates to an RFID magnetic sheet used in an RFID (Radio Frequency Identification) system, which is an application example thereof, and an electromagnetic shielding sheet used in a display or the like.

  Conventionally, the use of a thin magnetic sheet in which a magnetic layer is provided on a flexible substrate such as an RFID magnetic sheet or an electromagnetic shielding sheet is known.

  First, a conventional RFID magnetic sheet will be described. 2. Description of the Related Art In recent years, an RFID system, which is one of automatic recognition technologies that uses an electromagnetic field of a specific frequency radiated from an external device as a signal carrier wave and communicates ID (Identification) information and various data with the external device. It is becoming widely used. Examples of contactless IC cards using an RFID system include an IC telephone card, an electronic ticket, and an electronic money card. Recently, this RFID is mounted on a mobile phone and used. ing.

When an RFID system is mounted and used in a portable mobile communication device such as a mobile phone, it is necessary to secure a communication distance. Therefore, it is required to eliminate the influence of a magnetic path obstacle. More specifically, the RFID system has a drawback that communication becomes impossible when metal is adjacent to the RFID antenna. In particular, when a high-frequency electromagnetic signal such as 13.56 MHz is used, the RFID system has a significant problem due to its drawbacks. In order to solve this problem, a magnetic sheet containing ferrite having a high magnetic permeability is often attached to the RFID antenna. (For example, see Patent Document 1)
With reference to FIG. 1 to FIG. 3, a problem that communication cannot be performed when metal is adjacent to the RFID antenna will be described.

  FIG. 1 is a cross-sectional view showing the operation of a general RFID system 100. In this RFID system 100, an RFID antenna (tag antenna) 102 is attached to an IC tag 101 which is an example of a non-contact type IC card, and a reader / writer antenna 104 is attached to a reader / writer 103. When communicating, the IC tag 101 is positioned near the reader / writer 103. A magnetic flux loop 105 is generated from the reader / writer antenna 104 of the reader / writer 103. The RFID loop communication between the IC tag 101 and the reader / writer 103 is possible by the magnetic flux loop 105a penetrating both antennas (the tag antenna 102 and the reader / writer antenna 104). FIG. 1 schematically shows the state of communication when there is no metal product near the IC tag 101.

  FIG. 2 schematically shows a communication state when the metal product 106 is near the IC tag 101 in the RFID system 110 similar to FIG. In this case, an eddy current is generated in the metal product 106 located in the vicinity of the IC tag 101 by the magnetic field from the reader / writer 103, and a magnetic field (demagnetizing field) 107 generated by the eddy current is necessary for communication. Cancel the magnetic flux loop 105b. Therefore, communication becomes difficult.

  Therefore, when the metal product 106 is close to the IC tag 101, a measure is taken to place a magnetic sheet 108 between the IC tag 101 and the metal product 106, as shown in FIG. Since the magnetic sheet 108 contains ferrite having a high magnetic permeability, the magnetic flux loop 105 c can be concentrated on the magnetic sheet 108. As a result, generation of eddy current in the metal product 106 can be suppressed, and the communication distance can be improved.

  The action of the magnetic sheet 108 will be described in more detail with reference to FIGS. 4A and 4B. First, as shown in FIG. 4A, when there is no magnetic sheet, if an eddy current is generated in the metal product 106 near the IC tag (IC tag antenna 102) by the magnetic field from the reader / writer, the magnetic field generated by the eddy current ( The magnetic flux loop 105d indicated by the broken line is lost due to the influence of the demagnetizing field. As a result, the magnetic field necessary for communication is canceled.

  On the other hand, when the magnetic sheet 108 is used as shown in FIG. 4B, the magnetic flux 108 is concentrated on the magnetic sheet 108 because μ ′ (real part) of the magnetic permeability of the magnetic sheet 108 is high. In addition, since the magnetic permeability of μ ″ (imaginary part) of the magnetic sheet 108 is low, the magnetic flux loop 105e flows without magnetic loss. As a result, the communication distance can be improved.

  Next, a conventional electromagnetic shielding sheet will be described. In recent years, as the use of various electric facilities and electronic application facilities has increased, electromagnetic noise interference has been increasing. Noise is roughly divided into conduction noise and radiation noise. As a countermeasure against conduction noise, there is a method using a noise filter or the like. On the other hand, as countermeasures against radiated noise, it is necessary to insulate the space electromagnetically, so the housing is made of a metal body or a high conductor, a metal plate is inserted between the circuit board and the circuit board, A method such as wrapping with metal foil is taken.

  These methods can be expected to have an electromagnetic wave shielding effect for a circuit or a power supply block, but cannot be applied to electromagnetic wave shielding applications generated from the front surface of a display such as CRT, PDP, liquid crystal, and EL because they are opaque.

  Regarding the shielding property of electromagnetic waves generated from the front of the display, an EMI shielding function of 30 dB or more at 1 GHz is required, and acquisition of particularly strict standards is required for PDP for home TV. In addition, the electromagnetic shielding sheet for display is also required to have good visible light transmittance. Several methods have been proposed for achieving both electromagnetic shielding properties and transparency.

For example, Patent Document 2 discloses an electromagnetic shielding sheet in which a geometric figure drawn with a conductive material is provided on the surface of a transparent plastic substrate. Patent Document 3 discloses an electromagnetic shielding sheet in which an adhesive layer is laminated on a transparent substrate, and a conductive layer having a geometrical figure is embedded in the adhesive layer. Patent Document 4 discloses an electromagnetic shielding sheet in which a transparent conductive film is provided with a conductive layer formed by applying a coating in which chain aggregates of metal fine particles are dispersed. Usually, a type in which a metal is provided on a highly transparent film by sputtering and a type in which a metal mesh is provided on a highly transparent film are often used.
JP 2004-227046 A Japanese Patent Laid-Open No. 10-41682 JP 2000-323891 A JP 2000-124662 A

  However, the magnetic sheet 108 containing ferrite has the following problems. First, in the case of a magnetic sheet in which ferrite is dispersed in a resin, there is a limit to the upper limit of the effective magnetic permeability μ because of the structure in which a magnetic material (ferrite) is dispersed in the resin. In the case of a structure using a sintered body of ferrite (ceramic) instead of dispersing ferrite in the resin, the effective magnetic permeability μ is improved, but the magnetic sheet is brittle because it is a sintered body. Become. And the magnetic sheet of the sintered body has a limit in making it thin and has a limit in flexibility.

  In order to achieve both flexibility and high magnetic permeability μ, the inventor of the present application studied the use of a metal magnetic material for the magnetic sheet. Such a magnetic sheet exhibits a higher μ than when ferrite is used, but it is conductive and therefore generates eddy currents, resulting in a hindrance to communication. Therefore, as a practical problem, it has been difficult to use a metal magnetic material for a magnetic sheet.

  Moreover, the said conventional electromagnetic shielding sheet could not be said to have sufficient electromagnetic shielding properties. In order to solve this problem, the present inventor arranged an electromagnetic shielding sheet having a high magnetic permeability and a good electromagnetic shielding property by arranging needle-like crystals exhibiting the characteristics of an anisotropic soft magnetic material. We considered making it. However, since the effect of anisotropic needle crystals is remarkably reduced when the arrangement is random, it is necessary to control the arrangement of the needle crystals.

  In view of the above-described problems of the prior art, the present invention provides a magnetic stripe-shaped array sheet in which needle-like magnetic bodies are arranged in a good state in a predetermined stripe pattern, have a high magnetic permeability, and are easy to manufacture. The purpose is to provide.

  In addition, using the basic configuration of such a magnetic stripe array sheet, it is a thin and flexible RFID magnetic sheet with high magnetic permeability, or a display that combines electromagnetic shielding and transparency. An object is to provide an electromagnetic shielding sheet.

  Moreover, it aims at providing the manufacturing method for manufacturing those sheets with high performance by a simple process.

  The magnetic stripe-like array sheet of the present invention is disposed in a surface region of a resin film, a water repellent layer formed on the resin film, and the water repellent layer, and has a water repellent property of the water repellent layer. And a stripe pattern region having a relatively hydrophilic property, and a magnetic stripe pattern formed by accumulating and aligning acicular magnetic bodies in the stripe pattern region.

  The RFID magnetic sheet of the present invention includes a resin film laminated in a plurality of layers, a water repellent layer formed on each of the resin films, and a surface region of the water repellent layer, the water repellent layer having A stripe pattern region having hydrophilicity relative to water repellency; and a magnetic stripe pattern formed by accumulating and aligning acicular magnetic bodies in the stripe pattern region, A plurality of magnetic stripe patterns separated from each other are formed on the resin film, and the magnetic stripe pattern on each resin film is the magnetic stripe pattern on the other resin film. The mutual arrangement relationship is set so that the pattern and the planar shape intersect each other.

  The electromagnetic shielding sheet of the present invention is disposed in a surface region of a resin film, a water repellent layer formed on the resin film, and the water repellent layer, and is relative to the water repellency of the water repellent layer. A stripe-shaped pattern region having hydrophilicity, and a magnetic stripe-shaped pattern formed by accumulating and aligning acicular magnetic bodies in the stripe-shaped pattern region, and the stripe-shaped pattern region is in a lattice shape In the lattice pattern region formed, needle-like magnetic bodies are oriented and gathered in the lattice pattern region to form a magnetic lattice pattern.

  The method for producing a magnetic stripe-like array sheet of the present invention comprises a water-repellent layer on a resin film and a surface area of the water-repellent layer that is relatively hydrophilic to the water-repellent property of the water-repellent layer. A step (a) of forming a stripe-shaped pattern region comprising: a solution containing a needle-shaped magnetic material in the stripe-shaped pattern region, and aligning and assembling the needle-shaped magnetic material in the stripe-shaped pattern region; And (b) forming a magnetic stripe pattern.

  The RFID magnetic sheet manufacturing method of the present invention includes a water-repellent layer on a resin film and a stripe that is disposed in a surface region of the water-repellent layer and has a hydrophilic property relative to the water repellency of the water-repellent layer. A step (a) of forming a needle-shaped pattern region, and a solution containing a needle-shaped magnetic body is applied to the stripe-shaped pattern region formed on the resin film, and the needle-shaped magnetic body is formed in the stripe-shaped pattern region. In the step (a), including the step (b) of aligning and assembling the magnetic material to form a magnetic stripe pattern, and the step (c) of laminating the resin film on which the magnetic stripe pattern is formed. Forming a plurality of striped pattern regions separated from each other, and in the step (c), the magnetic stripe pattern on each of the resin films. But sets the mutual positional relationship in the magnetic stripe pattern and the planar shape of the other of said resin film so as to intersect with each other.

  The method for producing an electromagnetic shielding sheet of the present invention includes a stripe having a hydrophilicity relative to the water repellency of a water repellent layer and a water repellent layer disposed on a surface of the water repellent layer on the resin film. A step (a) of forming a needle-shaped pattern region, and a solution containing a needle-shaped magnetic body is applied to the stripe-shaped pattern region formed on the resin film, and the needle-shaped magnetic body is formed in the stripe-shaped pattern region. And (b) forming a magnetic stripe pattern by orienting and assembling, wherein in the step (a), the stripe pattern region is formed in a lattice shape, and in the step (b), the lattice pattern is formed. A magnetic lattice pattern is formed by aligning and assembling the acicular magnetic bodies in a stripe-shaped pattern region.

  According to the configuration of the magnetic stripe-like array sheet of the present invention, since the needle-like magnetic bodies are oriented and assembled in the hydrophilic stripe-like pattern region arranged in the surface region of the water repellent layer, High magnetic permeability can be easily obtained. The structure in which the acicular magnetic bodies are oriented can be easily obtained by assembling the acicular magnetic bodies in the hydrophilic area of the stripe-shaped pattern area using surface tension.

  According to the configuration of the RFID magnetic sheet of the present invention, the magnetic stripe is formed by a needle-like magnetic body, thereby avoiding the influence of eddy current generation, ensuring high permeability, and being thin and flexible. An RFID magnetic sheet can be obtained.

  According to the configuration of the electromagnetic shielding sheet of the present invention, by arranging the needle-like magnetic bodies showing the characteristics of the anisotropic soft magnetic material, the characteristics that have a high magnetic permeability and can exhibit good electromagnetic shielding properties, Transparency can be achieved.

  According to the method for manufacturing a magnetic stripe-like array sheet, RFID magnetic sheet, or electromagnetic shielding sheet of the present invention, the needle-like magnetic bodies are arrayed and gathered in the hydrophilic stripe-shaped pattern region by surface tension as described above. Each sheet having various characteristics can be manufactured with high performance by a simple process.

  According to the magnetic stripe array sheet of the present invention, a stripe pattern region having a hydrophilic property relative to the water repellency of the water repellent layer is provided in the surface region of the water repellent layer formed on the resin film. Since the acicular magnetic bodies are aligned and assembled in the stripe pattern region, high magnetic permeability can be easily obtained. Since the stripe-shaped pattern region is a relatively hydrophilic region, the needle-like magnetic material can be easily oriented by collecting the needle-like magnetic material in the hydrophilic region using surface tension. Can do.

  The configuration of the magnetic stripe array sheet of the present invention is particularly effective when applied to an RFID magnetic sheet. In other words, the RFID magnetic sheet of the present invention has a high transparency by focusing on a metal magnetic material that has an adverse effect due to eddy current because of its electrical conductivity, and is conceived of a configuration for eliminating the obstacle in use. It is possible to obtain a thin and flexible RFID magnetic sheet while ensuring the magnetic susceptibility. In order to solve the problem of eddy current, in the present invention, the influence of the generation of eddy current is avoided by using a metal magnetic material as a magnetic stripe. Then, the magnetic stripes are stacked to form a lattice pattern to facilitate the passage of the magnetic flux loop.

  In addition, the electromagnetic shielding sheet of the present invention has good electromagnetic shielding properties with high magnetic permeability by arranging acicular crystals that exhibit the characteristics of anisotropic soft magnetic materials, not isotropic magnetic materials. It is obtained. The effect of anisotropic needle crystals is remarkably reduced when the arrangement is random, and the arrangement of the needle crystals must be controlled. The inventor of the present application has found that acicular crystals are arranged and assembled in a hydrophilic lattice-like pattern by surface tension, and the electromagnetic shielding sheet of the present invention can be obtained.

  The present invention can take the following various forms based on the above-described configuration.

  That is, in the magnetic stripe array sheet of the present invention having the above-described configuration, the stripe pattern region can be formed as a region where the water repellent layer is lacking in a stripe shape in a planar shape.

  In the RFID magnetic sheet of the present invention having the above-described configuration, the magnetic stripe shape extending in the first direction and the magnetic stripe shape extending in the second direction, which are formed on the resin films of different layers, respectively. It can be set as the structure by which the lattice pattern is formed with the pattern.

  The resin film may further include the resin film on which a magnetic stripe pattern extending in a third direction different from the first and second directions is formed.

  A non-contact type IC card comprising the RFID magnetic sheet having the above configuration, an RFID antenna coil disposed adjacent to the RFID magnetic sheet, and an IC chip connected to the RFID antenna coil may be configured. it can.

  A portable mobile communication device comprising the RFID magnetic sheet having the above configuration, an RFID antenna coil disposed adjacent to the RFID magnetic sheet, and an IC chip connected to the RFID antenna coil is configured. can do.

Electromagnetic shielding sheet having the above structure is Ru can configure the flat panel display mounted to the front of the display panel.

  In the method for manufacturing a magnetic stripe-shaped array sheet of the present invention having the above-described configuration, the stripe-shaped pattern region can be formed by a region surrounded by the water-repellent layer and exposing the resin film.

  The step (a) includes forming a water repellent layer having water repellency with respect to the solution in the step (b) on the resin film, and using a mask that defines the stripe pattern region. Forming a hydrophilic region by exposing the aqueous layer.

  In addition, the step (a) may include a step of forming a hydrophilic region by exposing a film having a surface that changes to hydrophilicity upon exposure using a mask that defines the stripe-shaped pattern region.

  In the step (b), the needle-like magnetic body is introduced into the step of applying a solution onto the resin film on which the stripe pattern region is formed, and the solution applied onto the resin film. Process.

  The step (b) may include a step of dispersing the acicular magnetic body in the solution and a step of applying a solution in which the acicular magnetic body is dispersed on the resin film.

  In the step (b), it is preferable that the acicular magnetic bodies are arranged by the surface tension of the solution in the stripe pattern region.

  After the step (b), a step of transferring the magnetic stripe pattern to another film can be included.

  Said process (a) and (b) can be continuously performed by the roll-to-roll method.

  In the RFID magnetic sheet manufacturing method of the present invention having the above-described configuration, in the planar shape of the laminate of the resin film, the magnetic stripe pattern extending in the first direction and the magnetic stripe shape extending in the second direction. The laminate can be formed such that a lattice pattern is formed by the pattern.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiment relates to the case of an RFID magnetic sheet and an electromagnetic shielding sheet. However, the structure of the magnetic stripe-like array sheet of the present invention, which is a more general object, and the description of the manufacturing method thereof are substantially described. Is included. In the following drawings, for simplification of description, components having substantially the same function are denoted by the same reference numerals, and the description is not repeated. In addition, this invention is not limited to the following embodiment.

(Embodiment 1)
The RFID magnetic sheet according to Embodiment 1 of the present invention will be described with reference to FIGS. 5A and 5B and FIGS. 6A and 6B.

  FIG. 5A schematically shows a top surface configuration of the IC tag 1 using the RFID magnetic sheet of the present embodiment. FIG. 5B schematically shows a cross-sectional structure in a state where the RFID magnetic sheet 2 is attached to the IC tag 1.

  The IC tag 1 includes a card 3 as a base, an IC chip 4 disposed on the card 3, and a coil antenna (RFID antenna coil) 5 electrically connected to the IC chip 4. The IC tag 1 is used as a non-contact type IC card, a unique ID number is stored in the memory of the IC chip 4, and various information can be stored in the memory. The IC chip 4 includes a CPU and a memory, and can perform cryptographic processing, authentication, and storage processing.

  The RFID magnetic sheet 2 of the present embodiment is attached to the card 3 of the IC tag 1. Another layer may be interposed between the card 3 and the magnetic sheet 2. For example, an adhesive layer 6 can be provided as shown in the figure.

  FIG. 6A schematically shows a cross-sectional configuration of the RFID magnetic sheet 2. FIG. 6B is an exploded perspective view showing the magnetic sheet 2. The magnetic sheet 2 has a structure in which magnetic stripe sheets 10a and 10b are alternately laminated. Each magnetic stripe sheet 10 a, 10 b includes a resin film 11, a water repellent layer 12 formed on the resin film 11, and a magnetic stripe 13 made of acicular magnetic material formed in the surface region of the water repellent layer 12. It is composed of In addition, about the resin film 11, the cross-sectional hatching is abbreviate | omitted in consideration of legibility in the figure.

  In this structure, the plurality of magnetic stripes 13 in each layer of the magnetic stripe sheets 10a and 10b are arranged apart from each other and electrically insulated. In addition, the magnetic stripes 13 arranged in the magnetic stripe sheets 10a and 10b that are in a vertical positional relationship are separated from each other by the resin film 11 and electrically insulated from each other.

  In the stacked structure of FIGS. 6A and 6B, a combination of the magnetic stripe sheet 10a in which the magnetic stripes 13 are arranged in a row pattern and the magnetic stripe sheet 10b in which the magnetic stripes 13 are arranged in a column pattern, A grid pattern is formed. Note that the magnetic stripe sheet 10a and the magnetic stripe sheet 10b are members having the same material and structure except that the orientation of the magnetic stripes 13 is different. Therefore, in the following description, when the magnetic stripe sheet is generically referred to, it is described as the magnetic stripe sheet 10 with 10 as a reference symbol.

  FIG. 7 schematically shows the upper surface configuration of the resin film 11 on which the water repellent layer 12 is formed in the magnetic stripe sheet 10.

  On the resin film 11, a stripe pattern composed of a plurality of stripe-shaped regions (stripe regions) 14 in which the resin film 11 is exposed without the water-repellent layer 12 is formed. In the stripe region 14, acicular magnetic bodies 15 are oriented and gathered to form a magnetic stripe 13.

  The needle-like magnetic body 15 in the present embodiment is an anisotropic soft magnetic metal material, and as such a material, an iron-based metal magnetic body can be mentioned, and specifically, for example, Fe, Fe -Needle-like metal powders such as Al-Si and Fe-Ni can be used. The acicular magnetic body 15 may be a magnetic body (for example, an alloy containing the element) containing at least one element selected from the group consisting of Fe, Ni, and Co. Here, the case where Fe—Ni metal magnetic powder (needle crystal having a particle diameter of 10 to 20 μm and a particle length of 50 to 100 μm) is used as the acicular magnetic body 15 will be described.

  The stripe region 14 is a hydrophilic region relative to the water repellency of the water repellent layer 12. As will be described later, the acicular magnetic bodies 15 are gathered and oriented in the stripe region 14 by applying surface tension in the manufacturing process. The width L of the stripe region 14 is preferably narrower than the length A in the longitudinal direction of the needle-like magnetic body 15 for the arrangement of the needle-like magnetic bodies 15. Note that, as schematically shown in FIG. 7, the acicular magnetic body 15 in this embodiment is oriented so that the longitudinal direction of the acicular magnetic body 15 is aligned with the longitudinal direction of the stripe region 14.

  The length A in the longitudinal direction of the acicular magnetic body 15 is, for example, 100 μm or more (for example, 50 to 200 μm). The length A in the longitudinal direction of the acicular magnetic body 15 may be an average value (average crystal grain size in the longitudinal direction) for the plurality of acicular magnetic bodies 15. Therefore, with respect to the individual acicular magnetic bodies 15, there may be a case where the longitudinal length A of the acicular magnetic bodies 15 is shorter than the width L of the stripe region 14.

  Note that the orientation of the needle-like magnetic body 15 in the hydrophilic stripe region 14, the relationship between hydrophilicity and water repellency for a certain solution, the action of surface tension, and the like will be described in the description of the manufacturing method of the RFID magnetic sheet 2 described later. explain.

  The width L (line) of the stripe region 14 (thin line) can be appropriately determined depending on the type of the needle-like magnetic body 15 to be used, the performance required for the RFID magnetic sheet 2, and the like. For example, it is 0.5 mm or less (for example, 50 μm to 300 μm). The gap S (space) between the stripe regions 14 (thin lines) is, for example, 0.5 mm or less (for example, 50 μm to 300 μm). Fine lines and spaces can be appropriately set according to various conditions to be used.

  Here, when the needle-like magnetic body 15 has conductivity, the eddy current that is generated when the width L (line) of the stripe region 14 (thin line) becomes large becomes easier to flow. The smaller the value, the more the generation of eddy current can be prevented. Therefore, the width L has a correlation with the eddy current and is set so as to suppress the eddy current. The thinner L is, the better. Actually, in consideration of the processing limit and processing accuracy of the stripe region 14, it is desirable to set, for example, 20 μm to 300 μm.

  As for the gap S (space) of the stripe region 14 (thin line), as S increases, magnetic flux (electromagnetic waves that actually exist together with radio waves and fluctuate in frequency) easily leaks. As the value becomes smaller, the leakage of magnetic flux can be prevented. Therefore, the gap S has a correlation with the leakage of electromagnetic waves (shield effect) and is set so as to suppress the leakage, and the smaller the S, the better. Actually, when the processing limit and processing accuracy of the stripe region 14 are taken into consideration, the thickness is 50 μm to 300 μm.

  Considering the functions of eddy current suppression and electromagnetic wave leakage suppression, the smaller the width L and the gap S, the better. This means that the denser the fine wires, the better. As a result, the amount of magnetic material per unit volume increases, and as a result, it is possible to realize a magnetic sheet having a high net permeability.

  Typically, the magnetic stripe 13 intersects at 90 ° between the magnetic stripe sheet 10a in the row pattern and the magnetic stripe sheet 10b in the column pattern, but it does not necessarily have to intersect at 90 °. For example, a lattice pattern of magnetic stripes can be formed by intersecting at an angle of 60 ° or 45 °. It is also possible to overlap another magnetic stripe sheet on the magnetic stripe sheet 10a having the row pattern and the magnetic stripe sheet 10b having the column pattern.

  In short, the lattice pattern formed by the laminated structure of magnetic stripe sheets is one in which the magnetic stripes in each magnetic stripe sheet are arranged so as to intersect each other in the planar shape with the magnetic stripes in the other magnetic stripe sheets. . Thereby, it is necessary to be able to exhibit the function of facilitating the passage of the magnetic flux loop.

  In the example shown in FIG. 6A, each of the magnetic stripe sheets 10a and 10b is formed on the resin film 11, but another layer (for example, an adhesive layer) is formed on the resin film 11 or the magnetic stripe sheets 10a and 10b. ) May be interposed. It is also possible to form a magnetic stripe inside the resin film 11. In any case, it is desirable that the magnetic stripe sheets 10 of each layer are electrically insulated.

  What is necessary is just to select the resin film 11 suitably suitably according to a use, performance, and conditions, For example, an aramid resin film, a polyimide resin film, a polyethylene terephthalate resin film, a polyethylene naphthalate resin film etc. can be used. Since an aramid resin film has high heat resistance and is thin (for example, 3 μm or less), it may be preferable to use an aramid resin film from the viewpoint of thinness in consideration of the number of laminated layers.

  The thickness of the resin film (insulating film) 11 in this embodiment is, for example, 4 μm or more. Since the films are finally laminated, if the film 11 is thin, there is an advantage that the thickness of the RFID magnetic sheet 2 can be reduced. The film 11 in this embodiment consists of an aramid resin or a polyimide resin.

  As described above, in the RFID magnetic sheet 2 of the present embodiment, the stripe pattern is formed by the hydrophilic stripe region 14 that is the region exposed from the water-repellent layer 12 formed on the resin film 11, The magnetic stripes 13 are formed by the acicular magnetic bodies 15 being oriented and assembled together. Since the acicular magnetic bodies 15 are oriented and assembled in the stripe region 14 formed in the resin film 11, the RFID magnetic sheet 2 is thin and flexible compared to a ceramic sintered body (for example, ferrite). Is obtained. The stripe region 14 is relatively hydrophilic with respect to the water-repellent layer 12, and the arrangement of the acicular magnetic bodies 15 can be obtained by gathering in the hydrophilic region using surface tension. it can. By utilizing the surface tension, the arrangement of the needle-like magnetic bodies 15 can be performed in a self-aligned manner without the need to control each magnetic body particle using a manufacturing device.

  When the acicular magnetic body 15 is an anisotropic soft magnetic metal material, the RFID magnetic sheet 2 having a high magnetic permeability can be realized, and the acicular magnetic body 15 made of the soft magnetic metal material has Since they are arranged in the stripe region 14 of the resin film 11, the generation of eddy current can be suppressed even if the metal material has conductivity. Further, in the configuration of the present embodiment, since the lattice pattern is formed by the combination of the row pattern and the column pattern in the laminated body of the magnetic stripe sheets 10, the stripe regions of individual thin lines (strips) separated from each other are formed. The metal magnetic material is located at 14. Therefore, even if an eddy current is generated due to the conductivity of the metal magnetic material, the influence of the generation of the eddy current is sufficiently reduced. Here, if the effect of reducing the leakage magnetic field is significantly greater than the effect of the demagnetizing field due to the eddy current, the communication distance can be improved.

  Furthermore, as described above, the RFID magnetic sheet 2 of the present embodiment can be made thinner and more easily flexible than a ceramic magnetic material (ferrite). Therefore, the RFID magnetic sheet 2 of the present embodiment is suitable for a non-contact type IC card (particularly, one built in a mobile phone).

  Next, an example of a process for producing a magnetic stripe sheet, which is a part of the method for producing the RFID magnetic sheet 2 in the present embodiment, will be described with reference to FIGS. 8A to 8D.

  First, as shown in FIG. 8A, a hydrophilic stripe region 14 pattern surrounded by a water repellent layer 12 is formed on a resin film 11. In other words, the pattern of the water repellent layer 12 is formed except for the hydrophilic stripe region 14 which is a droplet formation region.

  In the present embodiment, the water repellent layer 12 is formed in order to reliably and easily form a droplet at a predetermined location (stripe region 14) on the resin film 11. The water repellent layer 12 is made of, for example, a photosensitive water / oil repellent resin. One example of the water-repellent layer 12 in the present embodiment is made of a UV curable resist film made by Nippon Paint. This material consists of silicone and an acrylic block polymer. More specifically, it has a structure of a sea-island structure of silicone and acrylic (so-called silicone island). Here, silicone has the characteristics of low surface tension, and acrylic plays a role in controlling the modification, hardness, adhesion, and UV curability of the resin. The contact angle of the formed water-repellent film with water is 100 ° to 105 °, and the falling angle measured by tilting the water-repellent film with respect to the water formed on the water-repellent film is 20 ° to 40 °. It is. On the other hand, the wettability of the portion from which the water repellent film has been removed has a contact angle with water of 40 ° to 45 °.

The hydrophilic stripe region 14 surrounded by the water repellent layer 12 can be formed, for example, as follows. First, a water repellent material is applied to the entire surface of the resin film 11. Specifically, it is applied to a thickness of 1 to 2 μm using spin coating. Next, the applied material is pre-baked (at 120 ° C. for 30 minutes), and then exposed using a mask that defines the hydrophilic stripe region 14 so as to form a predetermined pattern. The exposure can be performed at 300 mj / cm 2 using UV. Next, baking is performed at 120 ° C. for 30 minutes, and the film is developed by being immersed in toluene for 1 to 2 minutes. Finally, when post-baking is performed at 120 ° C. for 10 minutes, the water-repellent layer 12 is obtained.

  In addition, when a fluorine / acrylic block polymer manufactured by Asahi Glass Co., Ltd. is used as the photosensitive water / oil repellent resin, a hydrophilic property surrounded by a water / oil repellent water repellent layer 12 in a photolithographic process using i-line. A stripe region 14 can also be formed.

  Next, as shown in FIG. 8B, droplets 16 are formed on the resin film 11 after the water repellent treatment. The formation of the droplet 16 can be performed, for example, by spraying the liquid for the droplet 16 on the entire resin film 11 by spraying. Thereby, droplets 16 are formed in the hydrophilic stripe region 14 surrounded by the water repellent layer 12. Here, “hydrophilic” or “hydrophobic” refers to the property of the liquid constituting the droplet 16. Typically, a good affinity for water is called “hydrophilic”, and a low affinity for water is called “hydrophobic”. When the liquid constituting the droplet 16 is other than water, the determination may be made based on the affinity for the liquid. Therefore, when the droplet 16 is a liquid other than water, it may be expressed as “lyophilic” or “lyophobic”. However, in this specification, in order to simplify the expression, the description will be basically made using expressions of “hydrophilic” and “hydrophobic”.

  When the droplet 16 is formed in the stripe region 14 surrounded by the water repellent layer 12 and then the needle-like magnetic body 15 is introduced into the droplet, as shown in FIGS. 8C and 8D, the hydrophilic stripe region 14 is formed. The acicular magnetic bodies 15 are arranged inside, and the magnetic stripes 13 made of a magnetic material are formed. In addition, illustration of the droplet 16 is abbreviate | omitted in FIG. 8D.

  As shown in FIG. 9A, when the needle-like magnetic body 15 is introduced into the droplet 16 applied to the vertically long stripe region 14 having hydrophilicity, as shown in FIG. The longitudinal direction of the magnetic material 15 moves (rotates) so as to align with the longitudinal direction of the stripe region 14 due to the surface tension of the droplet 16. Thereby, the orientation of the acicular magnetic body 15 can be performed in a self-aligned manner. When the acicular magnetic body 15 is an anisotropic soft magnetic material, the longitudinal directions of the acicular magnetic bodies 15 are aligned in a self-aligned manner, so that the magnetic sheet 15 is not aligned randomly. The permeability can be remarkably improved.

  In order to efficiently self-align the orientation of the acicular magnetic body, it is also preferable to treat the surface of the acicular magnetic body to increase its surface energy and further increase the hydrophilicity. For example, the hydrophilicity can be enhanced by irradiating the surface of the acicular magnetic body with ultraviolet rays in an ozone atmosphere. By subjecting the magnetic material to a hydrophilic treatment, it can be more reliably assembled, and a denser magnetic film can be formed.

  It is also possible to increase the hydrophilicity of the acicular magnetic body by forming a lyophilic thin film (for example, a hydrophilic film) on the surface of the acicular magnetic body. For example, a thin film of silicon oxide, nitrogen oxide, titanium oxide, or the like may be formed on the surface of the needle-like magnetic body by a vacuum sputtering method or a thermal CVD method. It is also effective to irradiate ultraviolet rays in an ozone atmosphere after forming these thin films. The hydrophilicity can also be increased by modifying the surface of the acicular magnetic body with a silane coupling agent having an amino group, a carboxyl group or a hydroxyl group at the terminal. When surface-treating only a metal, the surface may be modified with a thiol having an amino group, a carboxyl group or a hydroxyl group at the terminal.

  The formation of the droplets 16 shown in FIG. 8B can be performed as shown in FIG. 10 instead of spraying mist. First, the liquid 17 for the droplet 16 is dropped on the entire surface of the resin film 11, and then a slide plate (for example, slide glass) 18 is pressed. After the liquid spreads over the entire surface of the resin film 11, the slide plate 18 is slid at a predetermined gap (see arrow 19), thereby forming a droplet 16 in a region (stripe region 14) surrounded by the water repellent layer 12. Is done.

  As a method for introducing the needle-like magnetic body 15, the method shown in FIGS. 11A and 11B can be used. That is, as shown in FIG. 11B, the needle-like magnetic body 15 is dropped from above on the resin film 11 after the droplet 16 as shown in FIG. The needle-like magnetic body 15 is introduced. Alternatively, the needle-like magnetic body 15 can be dispersed in a solution for the droplet 16 and the liquid droplet 16 containing the needle-like magnetic body 15 can be formed on the resin film 11 using the solution.

  In the above-described forming method, the acicular magnetic body 15 is not directly aligned on the resin film 11 to form the magnetic stripe 13 but the acicular magnetic body 15 is once aligned on another carrier film. After assembling, the magnetic stripe 13 can be formed by transferring it onto the resin film 11.

  By stacking the magnetic stripe sheets 10 in which the needle-like magnetic bodies 15 are arranged and gathered in a stripe shape formed as described above, the RFID magnetic sheet 2 including the laminate shown in FIGS. 6A and 6B can be manufactured. it can.

  Next, a method for laminating the magnetic stripe sheet 10 will be described. First, as shown in FIG. 12A, the magnetic stripes 13 formed on each resin film 11 are laminated so as to form a lattice pattern. In the figure, magnetic stripe sheets 10a having a row pattern and magnetic stripe sheets 10b having a column pattern are alternately arranged. An adhesive layer 20 is provided between the resin films 11. The adhesive layer 20 is made of an adhesive such as an epoxy resin, for example. In addition, what provided the adhesion | attachment function to the predetermined surface of the resin film 11 can also be used, without providing the contact bonding layer 20. FIG.

  Then, when a lamination process is performed and each resin film 11 is adhered to form a laminate, the RFID magnetic sheet 2 of the present embodiment is obtained as shown in FIG. 12B. The number of laminated magnetic stripe sheets 10 (the number of laminated resin films 11) may be determined in accordance with the desired characteristics of the RFID magnetic sheet 2. For example, 6 layers or more (for example, 10 to 15 layers) Can be.

  A typical example is that the magnetic stripe sheet 10a having a row pattern and the magnetic stripe sheet 10b having a column pattern are alternately laminated regularly, but a lattice pattern is obtained when the laminate is viewed from above (stacking direction). In some cases, the magnetic stripe sheets 10a and 10b may not be arranged accurately and alternately.

  The RFID magnetic sheet 2 of the present embodiment is not limited to the example in which the plurality of magnetic stripes 13 are orthogonal to each other at 90 °, and the plurality of magnetic stripes 13 may be obliquely intersected with each other. Further, the magnetic stripes 13 may be crossed at an angle other than 90 °, with one being parallel to the rectangular resin film 11 and the other extending obliquely.

  Alternatively, as shown in FIG. 13, the lattice pattern of the RFID magnetic sheet 2 extends in a third direction with a magnetic stripe 13 a having a pattern extending in the first direction, a magnetic stripe 13 b having a pattern extending in the second direction. It can also be constituted by a magnetic stripe 13c of a pattern. The arrangement of the magnetic stripes 13a to 13c of this pattern is schematically enlarged and shown in FIG.

  When the magnetic stripe sheet 10a having the row pattern and the magnetic stripe sheet 10b having the column pattern are crossed, the line width and space (interval) of the fine lines of the magnetic stripe 13 may not be unified in all layers. However, from the viewpoint of the manufacturing method, it is more efficient to use the magnetic stripe 13 having the same line and space in each layer.

  In the example of the manufacturing method described above, the water-repellent layer 12 is patterned to form the hydrophilic stripe region 14 surrounded by the water-repellent layer 12. However, the present invention is not limited to this, and the hydrophilic stripe region 14 is formed by other methods. It is also possible to form. For example, as shown in FIGS. 15A and 15B, a water repellent / hydrophilic pattern can be formed using a photocatalyst.

  First, as shown to FIG. 15A, the film in which the organic functional material layer 21 comprised from the organic functional material is formed in the surface is prepared. Next, ultraviolet rays (UV) are irradiated through a mask 22 that defines the pattern of the hydrophilic stripe region 14. The material constituting the organic functional material layer 21 is a material in which a molecular chain is cut by UV irradiation to form a hydrophilic group. Therefore, after UV irradiation, a hydrophilic stripe region 14 corresponding to the pattern of the mask 22 is formed as shown in FIG. 15B. In this example, a part of the alkyl chain is cleaved by reactive oxygen species generated by UV, thereby forming a hydrophilic region. In addition to the case where the hydrophilic stripe region 14 is formed by UV irradiation, the hydrophilic stripe region 14 can also be formed by irradiating a predetermined region with plasma.

  Further, the RFID magnetic sheet 2 of the present embodiment can be continuously manufactured by a roll-to-roll method. FIG. 16 shows an example of manufacturing the RFID magnetic sheet 2 by the roll-to-roll method.

  A resin film 11 on which the water repellent layer 12 is formed is wound around the unwinding roll 30. The resin film 11 drawn from the unwinding roll 30 is sent to the exposure unit 32 while being supported by a plurality of tension rolls 31. In the water repellent layer 12 formed on the resin film 11 sent to the exposure device 32, for example, a hydrophobic pattern and a hydrophilic pattern are formed by the UV exposure device 32. The resin film 11 taken out from the exposure device 32 is washed away by the squeegee 33 and the solution 34 to form the stripe region 14 exposed. Next, the resin film 11 moves in accordance with the rotation of the roll 35 and is immersed in a solution (suspension) 36 of a needle-like magnetic body. Thereafter, the resin film 11 is dried through the dryer 37, and the resin film 11 on which the magnetic stripe 13 made of the needle-like magnetic body 15 is formed is taken up by the take-up roll 38. The acicular magnetic substance solution (suspension) 36 contains water and an organic binder (polyvinyl alcohol; PVA), and this organic binder functions to fix the acicular magnetic substance 15 after drying. have.

  In order to move the resin film 11 back and forth in the exposure device 32, a movable tension roll may be additionally introduced, or the mask in the exposure device 32 is made movable to form a desired pattern. It is also possible to form them.

  FIG. 17 is an exploded perspective view showing the configuration of the mobile phone 40 on which the RFID magnetic sheet 2 of this embodiment is mounted. The mobile phone 40 is equipped with the RFID magnetic sheet 2 in the above-described embodiment. That is, the battery pack 42 is mounted on the main body 41 of the mobile phone 40, and the IC tag 1 is mounted on the battery pack 42 via the RFID magnetic sheet 2 and sealed with the lid 43.

  Since the metal battery pack 42 is mounted on the main body 41 of the mobile phone 40, the communication state of the IC tag 1 deteriorates if no action is taken. However, in this embodiment, since the RFID magnetic sheet 2 is disposed, it is possible to suppress the deterioration of the communication state. The RFID magnetic sheet 2 can be made thin and flexible while exhibiting high magnetic permeability. Therefore, even if the IC tag and the RFID magnetic sheet 2 are stored using the lid 43 of the mobile phone 40, it is easy to realize the thin mobile phone 40.

  The RFID magnetic sheet of the embodiment of the present invention can be used not only for a mobile phone but also for a portable mobile communication device such as a PDA. Further, the RFID magnetic sheet according to the embodiment of the present invention can be used by being affixed to a non-contact type IC card (or IC tag) without being mounted on a portable mobile communication device.

  12A and 12B, a film (resin film) on which a pattern of an RFID antenna coil is formed is laminated on the laminate of the resin film 11 on which the magnetic stripes 13 are formed. It is also possible to produce an IC tag with a magnetic sheet. Alternatively, a metal layer (for example, a copper layer) may be formed on the laminate, and the metal layer may be processed to form an RFID antenna coil pattern.

  The above description regarding the present embodiment is not limited, and various modifications can be made. For example, in the above example, the case where the fine lines constituting the magnetic stripe 13 are straight lines is shown, but the magnetic stripes 13 may be constituted by thin lines including curves as long as the fine lines do not contact each other.

  The magnetic stripe sheet 10 described in the above embodiment corresponds to the magnetic stripe arrangement sheet of the present invention, and the configuration of the magnetic stripe sheet 10 shows an example of the magnetic stripe arrangement sheet. . Moreover, it will be easily understood that a magnetic stripe-shaped array sheet having a more general configuration can be manufactured by the above-described method for manufacturing the magnetic stripe sheet 10.

(Embodiment 2)
The electromagnetic shielding sheet in Embodiment 2 of this invention is demonstrated referring FIG. 18 and FIG. FIG. 18 is a plan view schematically showing the upper surface configuration of the electromagnetic shielding sheet 50 of the present embodiment. FIG. 19 is an enlarged plan view showing a part of the electromagnetic shielding sheet 50 shown in FIG. The constituent elements of the electromagnetic shielding sheet 50 are the same as those of the magnetic sheet 2 in the first embodiment. Therefore, the same elements will be described with the same reference numerals.

  The electromagnetic shielding sheet 50 according to the present embodiment includes a resin film 11, a water repellent layer 12 formed on the resin film 11, and a magnetic lattice 51 including a needle-like magnetic body 15 formed in the water repellent layer 12. It is configured. A region (lattice region) 52 having a lattice pattern in which the surface of the resin film 11 is exposed due to lack of the water repellent material in the stripe shape is formed in the water repellent layer 12, and the acicular magnetic body 15 is formed in the lattice region 52. The magnetic lattice 51 is formed by being oriented and assembled.

  The electromagnetic shielding sheet 50 of this embodiment is attached to a display, and particularly has both characteristics of electromagnetic shielding and transparency for attaching to the front surface of the display. The electromagnetic shielding sheet 50 may be attached to any display device such as a CRT, a PDP (plasma display panel), a liquid crystal display (LCD), or an EL. However, the electromagnetic shielding sheet 50 of the present embodiment may be a PDP or an LCD. It is suitably used for flat panel displays such as In particular, the PDP needs to be shielded in order to emit electromagnetic waves from the front surface of the display, and is therefore more suitable.

  Similar to the stripe region 14 of the magnetic sheet 2 in Embodiment 1, the lattice region 52 in the electromagnetic shielding sheet 50 is a region that is relatively hydrophilic with respect to the water repellency of the water repellent layer 12 and is needle-shaped. The magnetic body 15 is gathered and oriented in the hydrophilic lattice region 52 by applying surface tension in the manufacturing process. As shown in FIG. 2, the width L of the hydrophilic lattice region 52 is preferably narrower than the length A in the longitudinal direction of the acicular magnetic body 15 for the arrangement of the acicular magnetic bodies 15. As schematically shown, the needle-like magnetic body 15 in the present embodiment has the longitudinal direction of the needle-like magnetic body 15 aligned with the longitudinal direction of the stripe-like pattern (strip) constituting the lattice region 52. Oriented.

  The length A of the acicular magnetic body 15 in the longitudinal direction is, for example, 100 μm or more (for example, 50 to 200 μm). The length A in the longitudinal direction of the acicular magnetic body 15 may be an average value (average crystal grain size in the longitudinal direction) of the plurality of acicular magnetic bodies 15. Therefore, with respect to the individual acicular magnetic bodies 15, there may be a case where the longitudinal length A of the acicular magnetic bodies 15 is shorter than the width L of the hydrophilic lattice region 52.

  The width L of the lattice region 52 (thin line) can be appropriately determined according to the type of the acicular magnetic body 15 to be used and the pixel design of the flat panel display (for example, PDP) to be applied. 5 mm or less (for example, 50 μm to 300 μm). The dimensions of the water repellent layer 12 between the lattice regions 52 (thin lines) can basically be determined corresponding to the pixels of a flat panel display (eg, PDP).

  The acicular magnetic body 15 in the present embodiment is an anisotropic soft magnetic material. Examples of such a material include iron-based magnetic metal, and specifically, needle-shaped metal powders such as Fe, Fe—Al—Si, and Fe—Ni can be used. The acicular magnetic body 15 may be a magnetic body (for example, an alloy containing the element) containing at least one element selected from the group consisting of Fe, Ni, and Co. Alternatively, a perovskite oxide magnetic powder (ferrite magnetic material) made of Fe and Sr, Ni, Co or the like can be used. Here, an example in which Fe—Ni metal magnetic powder (needle crystals having a particle diameter of 10 to 20 μm and a particle length of 50 to 100 μm) is used as the acicular magnetic body 51 will be described.

  What is necessary is just to select the resin film 11 suitably according to a use, performance, and conditions, for example, using a polyethylene terephthalate resin film (PET film), an aramid resin film, a polyimide resin film, a polyethylene naphthalate resin film, etc. Can do. In this embodiment, a case where a translucent PET film is used as the resin film 11 will be described. The thickness of the resin film 11 is selected in consideration of translucency and strength, and is, for example, 150 μm or less (for example, 25 to 100 μm).

  The magnetic grating 51 in the illustrated example is formed on the resin film 11, but another layer (for example, an adhesive layer, an adhesive layer, etc.) is formed on the resin film 11, the water repellent layer 12 and / or the magnetic grating 51. Alternatively, an adhesive layer) can be disposed. It is also possible to form the magnetic grating 51 inside the resin film 11 using other layers.

  In the electromagnetic shielding sheet 50 of the present invention, a hydrophilic lattice region 52 exposed from the water repellent layer 12 formed on the resin film 11 is formed, and the acicular magnetic bodies 15 are oriented and assembled in the lattice region 52. ing. An electromagnetic wave shielding of the display can be performed by the magnetic lattice 51 which is a mesh of the oriented acicular magnetic bodies 15. When the needle-like magnetic body 15 is an anisotropic soft magnetic material, it can exhibit good electromagnetic shielding properties with high magnetic permeability, so that it can be realized particularly as an electromagnetic shielding film on the front surface of the PDP panel. . Since the lattice region 52 is a relatively hydrophilic region with respect to the water repellent layer 12, the arrangement of the needle-like magnetic bodies 15 is gathered in the hydrophilic region by the surface tension applied in the manufacturing process. Thus, a desired state can be obtained. By utilizing the surface tension, the alignment of the needle-like magnetic bodies 15 can be performed in a self-aligned manner by the action of the surface tension without being controlled for each particle of the magnetic bodies using a manufacturing device.

  The electromagnetic shielding sheet 50 is capable of sufficiently shielding electromagnetic waves generated from a PDP or the like, and can obtain extremely good light transmittance by using a fine acicular magnetic material. As an electromagnetic shielding effect of the electromagnetic shielding sheet 50 of the present embodiment, there is an effect of reducing electromagnetic radiation from the PDP by 20 dB or more, and it is possible to secure a performance of nearly 80% in light transmittance.

  As a manufacturing method of the electromagnetic shielding sheet 50 of the present embodiment, the same method as the manufacturing method of the RFID magnetic sheet 2 in the first embodiment can be used. That is, the process for producing the magnetic stripe sheet shown in FIGS. 8A to 8D can be applied to the production of the electromagnetic shielding sheet 50. This is because the manufacturing method of the sheet on which the magnetic bodies are arranged is common.

  However, in the step of forming a hydrophilic region surrounded by the water-repellent layer 12 on the resin film 11 shown in FIG. 8A, a hydrophilic lattice region 52 is formed instead of the stripe region 14. That is, a pattern (here, a rectangular pattern) of the water repellent layer 12 is formed except for the hydrophilic lattice region 52 which is a droplet formation region.

Therefore, when the droplet 16 is formed in the hydrophilic region 22 surrounded by the water repellent layer 12 and then the needle-like magnetic body 15 is introduced into the droplet (solution), in the state shown in FIG. In the electromagnetic shielding sheet 50 according to the present embodiment, the points where the vertical lines and the horizontal lines of the lattice region 52 intersect are formed in the lattice region. However, since the needle-like magnetic bodies 15 cross each other, eddy currents are generated due to electrical conduction caused by the contact of the respective magnetic bodies and are consumed as thermal energy at the crossing portions, which is effective in terms of electromagnetic shielding characteristics. is there.

  As the acicular magnetic body 15, a needle-shaped magnetic body 15 having a metal having excellent conductivity may be used. By performing plating treatment of copper, nickel, silver or the like having good conductivity, the electromagnetic shielding effect of the needle-like magnetic body 15 and the thermal energy conversion of electromagnetic radiation energy due to the generation of eddy current due to contact between the needle-like magnetic bodies Thus, a better electromagnetic shielding effect can be obtained.

  As in the first embodiment, the formation of the droplets 16 shown in FIG. 8B can be performed as described with reference to FIG. 10 instead of spraying mist. Also, the method of introducing the needle-like magnetic body 15 can be as described with reference to FIGS. 11A and 11B as in the first embodiment.

  Further, the needle-like magnetic bodies 15 are not directly aligned and assembled on the resin film 11 in the form of a lattice to form the magnetic grating 51, but the needle-like magnetic bodies 15 are once oriented and assembled on another carrier film. Thereafter, the magnetic grating 51 can be formed by transferring it onto the resin film 11.

  In the above example, the water-repellent layer 12 is patterned to form the hydrophilic lattice region 52 surrounded by the water-repellent layer 12. However, the present invention is not limited to this, and as in Embodiment 1, FIGS. 15A and 15B As described with reference to FIG. 4, a water repellent / hydrophilic pattern can also be formed using a photocatalyst.

  Moreover, the electromagnetic shielding sheet 50 of this embodiment can also be continuously manufactured by the roll-to-roll method as described with reference to FIG. By manufacturing the electromagnetic shielding sheet 50 by the roll-to-roll method, a large size can be continuously produced at a high speed, so that a large cost reduction can be achieved.

  The description related to the present embodiment described above is not limited, and various modifications can be made. For example, in the above example, the thin lines constituting the lattice region 52 are straight, and the water repellent layer 12 is rectangular. However, if the electromagnetic shielding sheet is not affected by the display pixel design, It is also possible to construct electromagnetic shielding sheets of other shapes based on the electromagnetic shielding characteristics by the mesh made of a magnetic material.

  In addition to the electromagnetic shielding sheet 50 of the present embodiment, a transparent conductive film can be further formed on the entire surface. What formed the transparent conductive film in advance on the resin film may be used, and may be provided after the electromagnetic shielding sheet 50 is formed.

  Furthermore, an antireflection film may be combined with the electromagnetic shielding sheet 50 of the present embodiment.

  The magnetic stripe-like array sheet, RFID magnetic sheet, and electromagnetic shielding sheet of the present invention have a high magnetic permeability, a thin and flexible structure, and are useful for non-contact IC cards, displays, etc. It is.

Sectional drawing for demonstrating the state of the communication state in RFID system Sectional drawing for demonstrating the state of the communication state in RFID system Sectional drawing for demonstrating the effect of the magnetic sheet in RFID system Sectional drawing for demonstrating the effect | action at the time of communication in the state without a magnetic sheet Cross-sectional view for explaining the effect of magnetic sheet in detail The top view which shows typically the upper surface structure of an IC tag Sectional drawing which shows typically the cross-sectional structure of the RFID magnetic sheet affixed on an IC tag Sectional drawing which shows typically the structure of the RFID magnetic sheet in Embodiment 1 of this invention Exploded perspective view of the RFID magnetic sheet Top view schematically showing the configuration of the resin film on which the pattern of the water repellent layer is formed Sectional drawing for demonstrating the process of the manufacturing method of a magnetic stripe sheet which is a part of manufacturing method of the RFID magnetic sheet in Embodiment 1 Sectional drawing for demonstrating the process following the process of FIG. 8A of the manufacturing method Sectional drawing for demonstrating the process following the process of FIG. 8B of the manufacturing method. Plan view corresponding to FIG. 8C Top view for explaining how acicular magnetic materials are oriented in a self-aligned manner by surface tension Process sectional drawing for demonstrating the other example of the manufacturing method of the RFID magnetic sheet in Embodiment 1 Sectional drawing for demonstrating the process of introducing a needle-like magnetic body into the droplet in the manufacturing method of RFID magnetic sheet Sectional drawing for demonstrating the process following FIG. 11A Sectional drawing for demonstrating the process of laminating | stacking a magnetic stripe sheet which is a part of manufacturing method of the RFID magnetic sheet in Embodiment 1 Sectional drawing for demonstrating the process following the process of FIG. 12A. Top perspective diagram showing a modification of the RFID magnetic sheet in the first embodiment Partial enlarged view of the RFID magnetic sheet shown in FIG. Process sectional drawing for demonstrating the other example of a structure and manufacturing method of the RFID magnetic sheet in Embodiment 1 Sectional drawing for demonstrating the process following FIG. 15A. Process drawing for demonstrating the manufacturing method using the roll-to-roll method of the RFID magnetic sheet in Embodiment 1 1 is an exploded perspective view of a mobile phone on which an RFID magnetic sheet according to Embodiment 1 is mounted. The top view which shows typically the structure of the electromagnetic shielding sheet in Embodiment 2 of this invention Partial enlarged view for explaining an arrangement state of needle-like magnetic bodies in the electromagnetic shielding sheet

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 IC tag 2 RFID magnetic sheet 3 Card 4 IC chip 5 Coil antenna 6 Adhesion layer 10, 10a, 10b Magnetic stripe sheet 11 Resin film 12 Water repellent layer 13, 13a-13c Magnetic stripe 14 Stripe area 15 Needle-like magnetic body 16 Liquid Droplet 17 Liquid 18 Slide plate 19 Arrow 20 Adhesive layer 21 Organic functional material layer 22 Mask 30 Unwinding roll 31 Tension roll 32 Exposure unit 33 Squeegee 34 Solution 35 Roll 36 Solution (suspension) of acicular magnetic substance
37 dryer 38 take-up roll 40 mobile phone 41 main body 42 battery pack 43 lid 50 electromagnetic shielding sheet 51 magnetic grating 52 grating area 100 RFID system 101 IC tag 102 IC tag antenna 103 reader / writer 104 reader / writer antenna 105, 105a- 105e Magnetic flux loop 106 Metal product 107 Magnetic field 108 Magnetic sheet

Claims (21)

  1. A resin film;
    A water repellent layer formed on the resin film;
    A striped pattern region disposed within the surface region of the water repellent layer and having a hydrophilic property relative to the water repellency of the water repellent layer;
    A magnetic stripe arrangement sheet comprising: a magnetic stripe pattern formed by orienting and accumulating acicular magnetic bodies in the stripe pattern region.
  2.   2. The magnetic stripe arrangement sheet according to claim 1, wherein the stripe pattern region is a region in which the water repellent layer lacks in a stripe shape in a planar shape.
  3. A resin film laminated in multiple layers;
    A water repellent layer formed on each of the resin films;
    A striped pattern region disposed within the surface region of the water repellent layer and having a hydrophilic property relative to the water repellency of the water repellent layer;
    A magnetic stripe pattern formed by accumulating and aligning acicular magnetic bodies in the stripe pattern region;
    On each of the resin films, a plurality of magnetic stripe-like patterns separated from each other are formed,
    Each of the magnetic stripe patterns on each of the resin films has an arrangement relationship with each other so that the magnetic stripe patterns on the other resin films intersect with each other in a planar shape. RFID magnetic sheet used in the Frequency Identification system.
  4. A lattice pattern is formed by the magnetic stripe pattern extending in the first direction and the magnetic stripe pattern extending in the second direction, which are formed on the resin films of different layers, respectively. The RFID magnetic sheet according to claim 3 .
  5. 5. The RFID magnetic sheet according to claim 4 , further comprising the resin film on which a magnetic stripe pattern extending in a third direction different from the first and second directions is formed.
  6. RFID magnetic sheet according to claim 3 ,
    An RFID antenna coil disposed adjacent to the RFID magnetic sheet;
    A non-contact type IC card comprising an IC chip connected to the RFID antenna coil.
  7. RFID magnetic sheet according to claim 3 ,
    An RFID antenna coil disposed adjacent to the RFID magnetic sheet;
    A portable mobile communication device comprising an IC chip connected to the RFID antenna coil.
  8. A resin film;
    A water repellent layer formed on the resin film;
    A striped pattern region disposed within the surface region of the water repellent layer and having a hydrophilic property relative to the water repellency of the water repellent layer;
    A magnetic stripe pattern formed by accumulating and aligning acicular magnetic bodies in the stripe pattern region;
    The stripe pattern region is a lattice pattern region formed in a lattice shape,
    An electromagnetic shielding sheet for attaching to a display, in which acicular magnetic bodies are oriented and gathered in the lattice pattern area to form a magnetic lattice pattern.
  9. The flat panel display with which the electromagnetic shielding sheet of Claim 8 was attached to the front surface of the display panel.
  10. A step (a) of forming, on the resin film, a water-repellent layer and a striped pattern region which is disposed in a surface region of the water-repellent layer and is relatively hydrophilic to the water repellency of the water-repellent layer; ,
    And (b) forming a magnetic stripe pattern by applying a solution containing an acicular magnetic substance to the stripe pattern area and orienting and assembling the acicular magnetic substance in the stripe pattern area. The manufacturing method of a magnetic body stripe-like arrangement sheet.
  11. 11. The method of manufacturing a magnetic stripe-shaped array sheet according to claim 10 , wherein the stripe-shaped pattern region is a region surrounded by the water-repellent layer and exposing the resin film.
  12. The step (a)
    Forming a water repellent layer that exhibits water repellency with respect to the solution in the step (b) on the resin film;
    The method for producing a magnetic stripe array sheet according to claim 10 , further comprising: forming a hydrophilic region by exposing the water-repellent layer using a mask that defines the stripe pattern region.
  13. The step (a)
    The magnetic stripe-like arrangement sheet according to claim 10 , comprising a step of forming a hydrophilic region by exposing a film having a surface that changes to hydrophilicity upon exposure to light using a mask that defines the stripe-like pattern region. Manufacturing method.
  14. The step (b)
    Applying a solution on the resin film in which the stripe pattern region is formed;
    The method for producing a magnetic stripe-shaped array sheet according to claim 10 , further comprising a step of introducing the acicular magnetic body into the solution applied onto the resin film.
  15. The step (b)
    Dispersing the acicular magnetic body in the solution;
    The manufacturing method of the magnetic body stripe-like arrangement sheet of Claim 10 including the process of apply | coating the solution in which the said acicular magnetic body was disperse | distributed on the said resin film.
  16. The method for producing a magnetic stripe-arranged sheet according to claim 10 , wherein in the step (b), the needle-like magnetic bodies are arranged in the stripe pattern region by surface tension of the solution.
  17. The manufacturing method of the magnetic body stripe-like arrangement | sequence sheet | seat of Claim 10 including the process of transferring the said magnetic body stripe-like pattern to another film after the said process (b).
  18. The manufacturing method of the magnetic body stripe-like arrangement | sequence sheet | seat of Claim 10 which performs the said process (a) and (b) continuously by the roll-to-roll method.
  19. A step (a) of forming, on the resin film, a water-repellent layer and a striped pattern region which is disposed in a surface region of the water-repellent layer and is relatively hydrophilic to the water repellency of the water-repellent layer; ,
    A solution containing a needle-like magnetic body is applied to the stripe-shaped pattern region formed on the resin film, and the magnetic stripe-shaped pattern is formed by orienting and gathering the needle-like magnetic body in the stripe-shaped pattern region. Forming step (b);
    And laminating the resin film on which the magnetic stripe pattern is formed,
    In the step (a), a plurality of striped pattern regions are formed in a state separated from each other,
    In the step (c), the mutual arrangement relation is set so that the magnetic stripe pattern on each of the resin films intersects with the magnetic stripe pattern on the other resin film in a planar shape. A method of manufacturing an RFID magnetic sheet.
  20. In the planar shape of the laminate of the resin films, the laminate is formed such that a lattice pattern is formed by the magnetic stripe pattern extending in the first direction and the magnetic stripe pattern extending in the second direction. The method of manufacturing an RFID magnetic sheet according to claim 19 , wherein
  21. A step (a) of forming, on the resin film, a water-repellent layer and a striped pattern region which is disposed in a surface region of the water-repellent layer and is relatively hydrophilic to the water repellency of the water-repellent layer; ,
    A solution containing a needle-like magnetic material is applied to the stripe-shaped pattern region formed on the resin film, and the magnetic stripe-shaped pattern is formed by orienting and gathering the needle-like magnetic material in the stripe-shaped pattern region. Forming (b),
    In the step (a), the stripe pattern region is formed in a lattice shape,
    In the step (b), the method for producing an electromagnetic shielding sheet, wherein the acicular magnetic bodies are oriented and assembled in the lattice-like stripe pattern region to form a magnetic lattice pattern.
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