JP2004171312A - Noncontact ic card with rewrite recording layer and manufacturing method of noncontact ic card with rewrite recording layer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a noncontact IC card with a rewrite recording layer superior in external appearance and printing quality, and its manufacturing method. <P>SOLUTION: This noncontact IC card 1 with the rewrite recording layer is formed into an integral base body by performing a thermocompression press by sandwiching an antenna sheet 10 with an IC chip 12 attached thereto between obverse and reverse printing sheets 20 and 30 via adhesive sheets 13 and 14 and spacer sheets 15 and 16, and is characterized by using a biaxially oriented polyethylene terephthalate resin sheet for the obverse and reverse printing sheets by setting the orientation direction in the same direction. This manufacturing method of the noncontact IC card with the rewrite recording layer is characterized, for example, by being printed on and used for an outside surface of the same winding on the surface side of the IC card, and being printed on and used for the other surface of the same winding on the reverse side. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a non-contact IC card having a resin film having a rewritable recording layer formed on one side of a card and enclosing an IC chip and an antenna sheet.
Particularly, in a non-contact IC card with a rewritable recording layer manufactured by press-laminating a plurality of sheets including an antenna sheet, even if the layer configuration in the thickness direction of the card is asymmetric, no warpage occurs, and the appearance quality and printing quality are low. An excellent IC card is intended.
Therefore, the field of application of the present invention relates to the field of manufacture and application of non-contact IC cards with a rewritable recording layer.
[0002]
[Prior art]
In a conventional non-contact IC card with a rewritable recording layer, the layer structure in the thickness direction of the card is symmetric about an antenna sheet (generally, sometimes referred to as an "inlay") as a center layer in order to minimize warpage. Was like that. That is, a film having the same material and thickness as the film on which the rewrite recording layer was formed was provided on the surface opposite to the rewrite recording layer.
As another method, there is a method in which a rewrite recording layer is formed directly on the surface of a printing sheet to eliminate the above-mentioned film on the front and back of the card, and as a result, the layer structure in the thickness direction is made symmetric.
[0003]
5 and 6 are diagrams showing the layer structure of a non-contact IC card with a rewrite recording layer according to the prior art. FIG. 5 shows a structure in which a rewrite sheet is provided on one side of the card and a dummy sheet is provided on the other side. No. 6 shows a configuration in which the rewrite layer is directly formed only on the surface printing sheet.
In the case of FIG. 5, printing sheets 40 and 50 are provided on the front and back of the antenna sheet 10 via adhesive sheets 33 and 34 and spacer sheets 35 and 36, and the rewriting sheet 42 and the same material as the rewriting sheet are provided on the front and back of the card. And a dummy sheet 52 having a thickness, which is symmetrical with the antenna sheet 10 as a center layer.
[0004]
In the case of FIG. 6 as well, the layer structure of the card base material is the same as that of FIG. 5, but instead of providing the rewrite sheet on the front and back, the rewrite layer 43 is directly printed on the front print sheet 40 or the front print layer 41. are doing.
In the case of printing only the rewrite layer 43, unlike a rewrite sheet, the influence on the warpage of the card is small, and the recording layer can be formed on only one side. However, the layer configuration of the card base requires symmetry.
[0005]
The prior art of providing a non-contact IC card with a rewritable recording layer is not particularly detected, but there are Patent Literatures 1 and 2 as techniques for forming a sublimable dye receiving layer.
Patent Document 1 proposes, in a non-contact type IC card incorporating an IC unit, an IC card having a laminated structure in which a thermal transfer receiving layer is laminated on a uniaxially or biaxially stretched porous film on one side of the card. .
Patent Document 2 proposes that the substrate on the front and / or back side of the card is a uniaxially or biaxially stretched porous polyester film, and that a vinyl chloride resin film be laminated on the substrate to form a receiving layer. are doing.
In addition, as for a biaxially stretched polyethylene terephthalate resin sheet having fine cavities, there is Patent Document 3 and the like.
[0006]
[Patent Document 1] JP-A-2000-298716 [Patent Document 2] JP-A-2000-298717 [Patent Document 3] JP-A-2001-342273 [0007]
[Problems to be solved by the invention]
However, when the rewritable sheets are provided on both sides as in the above-described related art, a useless dummy sheet which does not function as a rewritable recording layer is required on the opposite side, which increases the cost. In order to reduce the cost, there is a card that uses an inexpensive material only for the film on the opposite surface, but if the material is different, the warpage cannot be eliminated, and the appearance quality and the suitability for rewrite printing have been significantly impaired.
In a card in which a rewrite layer is formed directly on the surface of a print sheet, a rewrite layer is formed after a pattern is printed on the print sheet, so that the yield is reduced and the cost is also increased.
[0008]
The technique of the prior patent document relates to a sublimation transfer receiving layer and cannot be applied to a rewrite recording layer as it is. In the laminated structure, it is considered that it is difficult to improve the appearance quality due to the warpage of the card and to improve the rewrite printing quality.
Therefore, the inventor of the present application has developed a non-contact IC card having a good reproducibility and excellent print quality even with an asymmetric layer structure with respect to the antenna sheet in the non-contact IC card with a rewritable recording layer. The research has been made to complete the present invention.
[0009]
[Means for Solving the Problems]
The first aspect of the present invention to solve the above problems is that an antenna sheet having an IC chip mounted thereon is sandwiched between printed sheets on the front and back sides via an adhesive sheet and a spacer sheet, and hot-pressed into an integrated base. In a non-contact IC card with a rewrite recording layer, a biaxially oriented polyethylene terephthalate resin sheet is used for the front and back printing sheets with the stretching direction being the same, and a rewrite sheet is stacked on one side of the card and pressed. A non-contact IC card with a rewritable recording layer, characterized by being laminated.
[0010]
A second aspect of the present invention that solves the above problem is that an antenna sheet on which an IC chip is mounted is sandwiched between printed sheets on the front and back via an adhesive sheet and a spacer sheet, and hot-pressed to form an integrated substrate. In the method for manufacturing a non-contact IC card with a rewrite layer, a biaxially stretched polyethylene terephthalate resin sheet taken from the same winding is used for the front and back printed sheets in the same stretching direction, and the front side of the IC card is further used. Is printed on the outer surface of the same take-up, and is used on the other side of the same take-up (the inner surface of the take-up) on the back side of the IC card. A method for producing a non-contact IC card with a rewritable recording layer, characterized in that a rewrite sheet is overlaid on one side and press-laminated.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
There are various types of non-contact IC cards, but in order to have a card thickness specified by JIS and ISO and a smooth card surface, an antenna sheet on which an IC chip is mounted is sandwiched between front and back card substrates. It is generally in the form.
Even when the antenna is formed by etching a metal thin film without using a winding, a projection of 20 μm to 40 μm is formed from the sheet surface as described above.
Since the IC chips attached to both ends of the antenna further have a thickness (protrusion) of about 150 μm to 300 μm, the antenna sheet has inevitable protrusions or irregularities, and is pressed and laminated as it is between ordinary front and back substrates. Therefore, an IC card having sufficiently excellent smoothness cannot be obtained.
[0012]
An object of the present invention is to provide a non-contact IC card having a rewritable recording layer on one side thereof and a sufficiently smooth card without warpage.
There are two types of warpage: "initial curl" that has already occurred after the press lamination process, and "deformation during use" that occurs when rewriting printing is performed on a card. However, the printing quality is impaired and must be eliminated.
[0013]
In order to solve the problem caused by the conventional method, the non-contact IC card with a rewritable recording layer according to the present invention has the following layer configuration. Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded sectional view showing a layer structure of the card of the present invention, FIG. 2 is a plan view of an antenna sheet used in the present invention, and FIG. 3 shows a state after press-laminating the layer structure of FIG. FIG. 4 is a sectional view taken along line AA of FIG. 3.
[0014]
The antenna sheet 10 has a planar coil antenna 11 on a sheet such as polyethylene terephthalate (PET) as shown in FIG. 2, and an IC chip 12 is mounted on both ends 111 and 112 of the coil antenna 11.
Although the coil antenna 11 is not shown in the figure, it is formed so as to orbit around the periphery of the card base (the hatched portion) several times. The coil antenna 11 is obtained by forming a resist on an aluminum foil or the like laminated on a sheet and leaving only the coil shape by a known photo-etching technique.
Note that the present invention is not limited to the IC chip, and may be an IC module sealed with a resin.
[0015]
When stacking card bases, as shown in FIG. 1, adhesive sheets 13 and 14 and spacer sheets 15 and 16 are inserted between the antenna sheet 10 and the front and back printing sheets 20 and 30, respectively. For the front and back printing sheets, a normal biaxially stretched polyethylene terephthalate (PET) resin sheet having no void is used so that the stretching directions are completely the same.
Of the spacer sheets 15 and 16, a sheet made of biaxially stretched polyethylene terephthalate resin having fine voids is used for the spacer sheet facing at least the side of the antenna sheet having the protrusions. This is because the fine cavities absorb irregularities of the antenna sheet 10 when hot pressing is performed.
Of course, a biaxially stretched PET resin sheet having fine cavities on both sides of the antenna sheet 10 may be used. FIG. 1 shows an example in which a biaxially stretched PET resin sheet having fine cavities is used for both spacer sheets.
[0016]
The fine cavities of the spacer sheets 15 and 16 preferably have a volume ratio of 20 to 30%. Thereby, when hot pressing is performed, 10 to 15% of the sheet thickness can be contracted by a compressive load. However, there is a feature that almost no displacement occurs in the horizontal direction due to the influence of biaxial stretching. In contrast to an adhesive sheet that flows laterally upon heating.
[0017]
Spacer sheets 15 and 16 made of biaxially stretched PET resin sheets having fine cavities include spacer core layers 15c and 16c having cavities and spacer skin layers 15s and 16s on both sides thereof.
The spacer skin layers 15s and 16s themselves use an amorphous polyester-based resin (PET-G resin) in consideration of the thermal fusibility between the layers. PET-G resin is generally a dehydration condensate of an aromatic dicarboxylic acid and a diol, and is made of a substantially non-crystalline, substantially non-crystalline aromatic polyester resin among copolymerized polyesters. Say.
[0018]
The reason why the adhesive sheets 13 and 14 are used is that the PET film serving as the antenna sheet does not have a heat-sealing property, and plays a role of firmly bonding the antenna sheet 10 and the spacer sheets 15 and 16. For this, a hot-melt adhesive sheet can be suitably used.
In the case of the card layer structure of the present invention, the melt viscosity of the adhesive sheet at 190 ° C. needs to be 2500 Poise or less. This is because, in combination with the spacer sheet which flows in the horizontal direction due to the heat at the time of press lamination and is compressed in the thickness direction by the load, an effect of completely absorbing the unevenness of the antenna sheet is exhibited.
[0019]
Through holes 151 and 161 are formed in portions of the spacer sheets 15 and 16 where the IC chip 12 abuts or is positioned so that the thickness of the IC chip can be absorbed. Does not have a through hole. This is because a gap between the through hole and the IC chip is eliminated to prevent the occurrence of a dent, and the adhesion of the protrusion of the IC chip 12 is strengthened.
[0020]
As the printing sheets 20 and 30 on the front and back sides, a white PET sheet biaxially stretched as described above is used. In general, a decorative front print layer 21 is often printed on the front print sheet 20 before pressing, and a back print layer 31 of characters or the like is often printed on the back print sheet 30 after pressing. However, it is not limited thereto.
Further, those having a thermal conductivity of 0.12 W / m · K or more are preferable. This is because when the thermal conductivity is low, heat is easily stored and it is difficult to cool down, so that the print density of rewrite is lowered and characters are blurred. In particular, since a leuco-based rewrite material loses printing when cooled slowly, a card base material that cools quickly and has a high thermal conductivity is preferable.
[0021]
The thermal conductivity of general biaxially stretched PET is 0.12 to 0.15 W / m · K. For example, the void-containing PET is 0.10 W / m · K or less, but when a material of 0.10 W / m · K or less is used for a printing sheet, the rewrite printing tends to be thin, and the reader / writer has Condition adjustment becomes difficult.
[0022]
In the case of transportation or the like, a rewrite sheet 22 capable of thermal recording is adhered to a part or the entire surface of the surface printing sheet 20. The rewrite sheet is transparent and does not hinder the visibility of the surface print layer 21.
After completion, the rewrite sheet becomes a rewrite recording layer, and the thermal section prints the boarding section and the validity period clearly, and after use, can be erased and used repeatedly. In addition, although not shown, it is free to provide an image receiving layer for sublimation transfer recording and to emboss characters.
[0023]
Earlier, it was stated that the front and back printing sheets need to use a normal biaxially stretched PET resin sheet having no voids so that the stretching direction is completely the same direction. The meaning of making the directions completely the same will be described.
The heat resistance (temperature at which no warpage occurs) of the stretched PET sheet is generally said to be 75 ° C to 85 ° C. When heat exceeding 90 ° C. is received, molding distortion (internal stress) is reduced, and a dimensional change occurs. Since the hot pressing conditions of the card substrate naturally exceed this temperature, in the case of the card of the present invention manufactured by using a plurality of stretched PETs on one card substrate, the length and width of each sheet are required. If the amount of expansion and contraction in the direction is different, the card substrate will be warped.
Therefore, it is necessary to align the orientation (stretching direction) of the sheets to be used.
[0024]
FIG. 7 is a diagram showing a manufacturing (stretching) process of the PET sheet, and FIG. 8 is a diagram showing an example of a card printing process and a lamination process.
As shown in FIG. 7 (A), after being extruded by the T-die 4, the film is stretched in-line or off-line by applying tension in the longitudinal (flow) direction and the transverse direction, and finally fixed by applying heat. Initially, the width of the sheet 2 is 2 to 5 m, but depending on the specifications and purpose of the customer, the sheet 2 is wound as slit narrow sheets S1, S2, S3, S4, S5, or cut off. The sheet is shipped as a single sheet (FIG. 7B).
The stretched sheet is initially stretched in a wavy orientation direction 5 as shown in FIG. 7 as a parallel portion perpendicular to the flow of the sheet advances in the machine direction (MD). Therefore, each of the narrow sheets S1 to S5 has a different molding distortion, and when they are used for the front and back printing sheets without selection, the dimensional changes of the front and back are different, so that various warping states are caused. Will be presented.
[0025]
Therefore, in the method for manufacturing a non-contact IC card having a rewrite recording layer according to the present invention, the biaxially extending direction of the front and back printing sheets is completely the same, for example, as shown in FIG. In contrast to S4, the pattern portions on the front and back sides are alternately printed, such as the pattern on the front surface of the card in the portions S41 and S43, and the pattern on the back surface of the card in the portions S42 and S44. The front and back printing sheets cut from the cutting line 6 as described above are used as laminated as shown in FIG. 8B.
At this time, of course, the vertical and horizontal directions do not intersect, and even in the same vertical direction, the head part and the tail part in the flow direction do not overlap. Also, the printing surface is on the outer surface side of the card on both sides. However, it is obvious to those skilled in the art that this condition is maintained even when the printing surface is set to the inside surface on both sides.
That is, in the present invention, the completely same direction means that all of the printing sheets 20, 30 in the front, rear, left and right directions are coincident, the front and back printing sheets are symmetrically arranged with respect to the central layer of the card, and This means that the sampling position (constant position from the side) is also matched.
[0026]
When the biaxially stretched sheet is cut and used, for example, as shown in FIG. 8B, the above-mentioned S41 and S42 parts are cut, and the S41 sheet is the front side sheet and the S42 sheet is the back side sheet. Used in combination.
Since multiple sheets are printed on each sheet, 20 to 30 cards can be obtained from one sheet set. Thus, a card without warpage is obtained.
In the case of a single sheet, a set of front and back combinations can be easily distinguished by cutting a corner (corner) into a specific shape 3 and marking it before printing.
[0027]
After press-laminating the layer configuration of FIG. 1, a non-contact IC card 1 as shown in FIGS. 3 and 4 is obtained. FIG. 3 is a front side plan view in which the rewrite print 22P printed on the rewrite recording layer can be visually recognized together with the print pattern 21P.
FIG. 4 is a sectional view taken along line AA of FIG. The IC chip 12 is firmly adhered to the print sheet 30 by the adhesive sheet 14 and to the print sheet 20 by the adhesive sheet 13. Further, since the IC chip 12 is located substantially at the center of the card base, the appearance is not significantly impaired by the influence of the IC chip.
In FIG. 4, the antenna sheet 10 is bent only at the IC chip portion, and the coil antenna 11 itself is at the flat portion, so that the communication characteristics are not affected. The through holes 151 and 161 are almost filled by the melting of the adhesive sheets 13 and 14 and the deformation of the spacer sheets 15 and 16.
[0028]
The sheets used for the spacer sheets 15 and 16 are characterized by using a biaxially stretched PET resin sheet having fine cavities of 20 to 30% by volume as described above. The cavities usually have a fine disk shape parallel to the sheet surface, mainly containing fine particles. In such a sheet, since the cavities in the portion subjected to the high pressure are strongly compressed, as a result, the protrusions and uneven shapes can be absorbed.
The reason why the void content is 30% or less is that if it exceeds 30%, the strength becomes insufficient and the card base material becomes insufficient. The reason why the content is set to 20% or more is that if the content is less than 20%, the content of cavities is so small that irregularities and projections cannot be sufficiently absorbed.
This is about 20% lighter than a normal PET sheet and has a density of about 1.1 g / cm ³ .
[0029]
As described in Patent Document 3, the formation of such cavities can be achieved by mixing inorganic fine particles in polyester and stretching in the sheet forming step to form cavities around the particles, There is known a method in which incompatible thermoplastic resin microspheres and the like are mixed and dispersed in polyester, used as nuclei for forming cavities, and similarly stretched.
Examples of the latter cavity forming agent include polyolefin resins and polystyrene resins represented by polypropylene resins and polymethylpentene resins.
[0030]
【Example】
A non-contact IC card with a rewrite recording layer used for a ticket gate application of a vehicle was manufactured. An embodiment of the present invention will be described with reference to FIGS.
(Example)
<Preparation of antenna sheet>
A coil antenna 11 was formed by bonding a 20-μm-thick aluminum foil to a 40-μm-thick PET film via an adhesive, and etching the aluminum foil. Further, an IC chip 12 having a thickness of 300 μm was electrically connected to both ends of the coil and mounted, thereby completing the antenna sheet 10 included in the card.
The IC chip 12 has a thickness of 175 μm, a reinforcing plate of 100 μm and an anisotropic conductive sheet of 50 μm superimposed thereon, and a total thickness of 300 μm after receiving the pressure of press lamination.
[0031]
<Manufacture of card base>
The layer structure of the card base is such that a spacer made of a biaxially stretched PET resin sheet having 50 μm-thick adhesive sheets 13 and 14 on the front and back sides of the antenna sheet 10 and a fine cavity with a volume ratio of 20 to 30% outside thereof is provided. Sheets 15 and 16 were used.
Each of the spacer sheets 15 and 16 has a total thickness of 180 μm having a spacer core layer having a thickness of 100 μm and spacer skin layers of PET-G resin having a thickness of 40 μm on both surfaces.
Further outside the spacer sheets 15 and 16, biaxially stretched PET printing sheets ("Lumirror" manufactured by Toray Industries, Inc.) 20 and 30 having a thickness of 125 μm are stretched so that the stretching directions are completely the same, and the front and back sides are the same. They were arranged to be symmetric. In order to ensure rewrite printing suitability, a printing sheet having a thermal conductivity of 0.14 W / m · K was used.
The spacer sheet on the front side and the spacer sheet on the back side of the card, and the printing sheet on the front side and the printing sheet on the back side were overlapped so that the respective stretching directions completely coincided.
[0032]
As the adhesive sheets 13 and 14, a polyester hot-melt adhesive (melt viscosity: 2000 Poise: 190 ° C.) was adopted in consideration of the suitability of the PET film of the antenna sheet and the spacer sheets 15, 16.
In the spacer sheets 15 and 16, through holes 151 and 161 having the same size (about 5 mm × 5 mm) as the IC chip 12 were punched out in advance so that the IC chip mounted on the antenna sheet penetrated. The sheets 13 and 14 were not provided with through holes.
[0033]
Biaxially stretched PET sheets were used as the printing sheets 20 and 30 provided outside the spacer sheets 15 and 16. This sheet contains no cavities and does not compress under the pressure of the press laminate.
On the print sheet 20 on the front side of the card, a picture corresponding to the arrangement of the inlay was printed in advance. The printing was performed by a method of overlaying offset printing on silk screen printing.
[0034]
In addition to the above seven layers, a 50 μm thick rewrite sheet 22 was provided only on the outermost surface side of the card so that the expiration date of the card and the like could be displayed.
The rewrite sheet 22 has a rewrite recording layer made of a leuco dye and a protective layer formed on a biaxially stretched PET resin film (thickness: 25 μm). The PET resin film has an adhesive layer on the card surface side.
As a result, the layer configuration is conveniently eight layers, and the total thickness of the materials used, excluding the thicknesses of the coil antenna 11 and the IC chip, is 800 μm.
[0035]
Positioning of the antenna sheet 10, the adhesive sheet, and the spacer sheet was performed by fitting holes formed in the antenna sheet, the adhesive sheets, and the spacer sheet into pins.
The eight-layer laminate was placed on a hot plate of a press and press-laminated. The conditions of the pressing step were as follows: hot plate temperature 120 ° C., pressure 2.0 MPa, molding (heating) time 20 min. I went to set.
[0036]
After punching out the sheet integrated with the press into a card shape in accordance with the pattern, a pattern printing 31 was finally performed on the back side. As in the case of the front side, printing was performed by overlaying offset printing on silk screen printing.
In this way, a non-contact IC card 1 having a total thickness of 0.80 mm and a rewritable recording layer was completed.
The resulting non-contact IC card was smooth and free of "initial curl", had excellent appearance quality, and excellent rewrite printing quality. Also, there was no warpage of "deformation during use", and the entire manufacturing process was not particularly difficult.
[0037]
【The invention's effect】
As described above, in the non-contact IC card with a rewritable recording layer of the present invention, it is not necessary to provide a warp correcting film on the surface opposite to the rewritable recording layer, so that the cost can be reduced.
Further, since the printing step for the printing sheet and the step of forming the rewrite layer on the film can be performed on separate lines, the productivity can be improved, the yield can be increased, and the cost can be reduced.
Further, since the rewrite layer can be formed irrespective of the print layer, the selection range of the pattern and the printing ink that can be used is widened, and the stability of the adhesion can be secured.
According to the method for manufacturing a non-contact IC card with a rewritable recording layer of the present invention, even if the layer configuration in the thickness direction of the card is asymmetric, no warping of “initial curl” or “deformation during use” occurs. A non-contact IC card with a rewrite recording layer having excellent appearance quality and rewrite printing quality can be manufactured at low cost.
[Brief description of the drawings]
FIG. 1 is an exploded sectional view showing a layer structure of a card of the present invention.
FIG. 2 is a plan view of an antenna sheet used in the present invention.
FIG. 3 is a front side plan view showing a state after press lamination of the layer configuration of FIG. 1;
FIG. 4 is a sectional view taken along line AA of FIG. 3;
FIG. 5 is a view showing a conventional non-contact IC card with a rewritable recording layer, in which a rewrite sheet is provided on one side of the card and a dummy sheet is provided on the other side.
FIG. 6 is a view showing a conventional non-contact IC card with a rewritable recording layer, in which a rewritable layer is directly formed only on a front surface printing sheet.
FIG. 7 is a view showing a manufacturing (stretching) step of a PET sheet.
FIG. 8 is a diagram showing an example of a card printing step and a card stacking step.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Non-contact IC card 2 Initial sheet 4 T die 5 Orientation direction 6 Cutting line 10 Antenna sheet 11 Coil antenna 12 IC chip 13, 14, 33, 34 Adhesive sheets 15, 16, 35, 36 Spacer sheets 20, 30, 40, Reference Signs Reference numeral 50 print sheets 21, 41 front print layer 22, 42 rewrite sheet 43 rewrite layer 31, 51 back print layer 52 dummy sheet

Claims (5)

An antenna sheet on which an IC chip is mounted is sandwiched between printed sheets on the front and back via an adhesive sheet and a spacer sheet, and hot-pressed to form an integrated substrate. A non-contact IC with a rewritable recording layer, characterized in that a sheet made of biaxially stretched polyethylene terephthalate resin is used with the stretching direction being the same, and a rewrite sheet is stacked and press-laminated on one side of the card. card. 2. The non-contact IC card with a rewritable recording layer according to claim 1, wherein a through-hole for absorbing the thickness of the IC chip is formed in the spacer sheet. A spacer sheet made of biaxially stretched polyethylene terephthalate resin having a fine cavity of 20 to 30% in volume ratio and an adhesive sheet are provided between the front and back printing sheets on at least the side of the antenna sheet having the projections. The non-contact IC card with a rewrite recording layer according to claim 1 or 2. 4. The biaxially stretched polyethylene terephthalate resin spacer sheet having fine cavities provided on both sides of the antenna sheet, wherein the biaxially stretched direction of the spacer sheet is the same. Non-contact IC card with rewrite recording layer. In a method of manufacturing a non-contact IC card with a rewritable layer, an antenna sheet having an IC chip mounted thereon is sandwiched between printed sheets on the front and back via an adhesive sheet and a spacer sheet, and pressed by heat and pressure to form an integrated substrate. A biaxially stretched polyethylene terephthalate resin sheet taken from the same take-up is used as the print sheet with the stretching direction being the same, and the IC card is printed on the outer surface of the same take-up on the front side. Then, on the back side of the IC card, the other side of the same take-up (the inner side of the take-up side) is printed and used, and on one side of the card, a rewrite sheet is overlaid and press-laminated. A method for manufacturing a non-contact IC card with a rewrite recording layer.

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