JP2008221502A - Rfid tag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a RFID tag, the product lift of which can be prolonged by making a reversible thermosensitive recording layer interchangeable. <P>SOLUTION: In the RFID (radio frequency indentification) tag 1 formed by providing the reversible thermosensitive recording layer 5 on one side of an armored body 2, in which an IC chip 3 and a loop antenna 4 are built, the reversible thermosensitive recording layer 5 is equipped with a sheet-line paper base material 6 and a reversible thermosensitive recording material 7 coating the sheet-like paper base material 6 under the condition that the reversible thermosensitive recording layer 5 is made interchangeable through the easily solubility characteristics of an alkaline soluble self-adhesive by bonding the under surface of the sheet-like paper base material 6 onto one side of the armored body 2 through the alkaline-soluble self-adhesive (self-adhesive layer) 8, which dissolves itself by alkaline water solution. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an RFID tag capable of easily exchanging a reversible thermosensitive recording layer provided on one surface of an exterior body.

  An RFID tag such as a non-contact IC tag used in an RFID (Radio Frequency Identification) system has an IC chip and a loop antenna built in a flat plate-shaped exterior body, and is connected to an input / output device (reader / writer). A battery-less data carrier with a function capable of transmitting and receiving signals such as commands and data in a non-contact manner using electromagnetic waves, and when entering an effective electromagnetic wave zone radiated by an antenna on the input / output device side, the RFID The loop antenna included in the tag generates an induced electromotive force, and is activated by the power to detect signals such as commands and data from the input / output device, and read / write data included in the IC chip according to the command signals. The received data is stored in a memory capable of transmitting data, and the data stored in the memory is transmitted to the input / output device. , Because it has excellent portability in a compact, in recent years, transportation and leisure areas, logistics, security field, factory production field, the environmental field, is introduced in a wide range of other areas are underway.

In addition, such an RFID tag is also known in which a reversible thermosensitive recording layer is provided on one surface of an exterior body so that information relating to data stored therein can be reversibly rewritten and displayed as visible information. Yes. The reversible thermosensitive recording layer may be provided by directly applying a reversible thermosensitive recording material on one surface of the outer package by a printing method, a coating method, or the like (see, for example, Patent Document 1), or a reversible thermosensitive recording material on the upper surface. The coated sheet-shaped synthetic resin base material is provided by adhering to one surface of the exterior body with an adhesive (see, for example, Patent Document 2). Visible information can be reversibly rewritten by printing on the reversible thermosensitive recording layer with a writing device equipped with a thermal head.
JP 2006-244013 A (paragraph [0033]) JP 2004-265247 A (paragraph [0022])

  By the way, in the RFID tag, although it depends on the specification, the data can be updated from tens of thousands to 100,000 times in general, the reversible thermosensitive recording layer provided on one surface of the exterior body is The rewrite and display of visible information can be improved by digesting the rewrite number of about 100 times, mainly due to thermal head rubbing at the time of rewriting visible information, dirt and damage during operation, etc. It will disappear. For this reason, there is a problem that the life of the product is exhausted even though the number of times that the RFID tag data can be updated is still sufficient.

  An object of the present invention is to provide an RFID tag that can solve such a problem by making a reversible thermosensitive recording layer inexpensive and easily replaceable.

  The present invention provides an RFID tag in which an IC chip and a loop antenna are incorporated in an exterior body, and a reversible thermosensitive recording layer is provided on one surface of the exterior body. Comprising a reversible thermosensitive recording material coated on a sheet-like paper substrate, and joining the lower surface of the sheet-like paper substrate to one surface of the exterior body with an alkali-soluble adhesive that dissolves in an alkaline aqueous solution, The RFID tag is characterized in that the reversible thermosensitive recording layer can be exchanged through the easy solubility of the alkali-soluble adhesive.

  Here, an RFID tag having an IC chip and a loop antenna built in an exterior body is obtained by integrating an IC module layer including an IC chip and a loop antenna by sandwiching the exterior body made of a pair of upper and lower synthetic resin sheets. It can be suitably used.

  In addition, a configuration is proposed in which the alkali-soluble pressure-sensitive adhesive is soluble in an alkaline aqueous solution having a pH of 9 or higher.

  As described above, the reversible thermosensitive recording layer comprises a sheet-like paper base material and a reversible thermosensitive recording material coated on the sheet-like paper base material. Because the RFID tag enables the reversible thermosensitive recording layer to be exchanged through the easy solubility of the alkali-soluble adhesive by joining the lower surface of the outer body to one surface of the exterior body with an alkali-soluble adhesive that dissolves in an alkaline aqueous solution. When the reversible thermosensitive recording layer is deteriorated by use, the reversible thermosensitive recording layer can be easily removed from the outer package by dissolving the alkali-soluble adhesive using an alkaline aqueous solution. A new reversible thermosensitive recording layer can be rejoined. Since the reversible thermosensitive recording layer can be exchanged as many times as necessary, the product life can be extended to the limit of data update of the RFID tag, and the RFID tag itself can be mounted in a short cycle. Compared to replacement, the total cost can be reduced. In addition, since the sheet-like paper base material was used as the base material of the reversible thermosensitive recording layer, the permeation action of the alkaline aqueous solution over the entire surface of the base material was obtained, compared with the case where a base material made of a synthetic resin was used, The alkali-soluble pressure-sensitive adhesive on the lower surface side of the base material can be dissolved quickly and smoothly, and the paper base material is cheaper than the base material made of synthetic resin, so that the product production cost can be reduced.

  Further, when the alkali-soluble pressure-sensitive adhesive is dissolved in an alkaline aqueous solution having a pH of 9 or more, it does not dissolve in alkaline water close to neutrality. Unnecessary peeling of the thermal recording layer can be reliably prevented.

Below, one Example of this invention is described based on FIGS. 1-3.
As shown in FIGS. 1 and 2, the RFID tag 1 includes an IC chip 3 and a loop antenna 4 incorporated in a flat rectangular outer package 2, and a reversible thermosensitive recording layer on one surface of the outer package 2. 5 is provided. Here, the exterior body 2 is composed of a pair of upper and lower synthetic resin sheets 2a and 2b, and is laminated with an IC module layer 10 having an IC chip 3 and a loop antenna 4 disposed therebetween, and a non-alkali soluble adhesive is applied. It is integrated through. The IC chip 3 and the loop antenna 4 are carried on the surface of the insulating substrate 9 and are not shown in the figure, but they are electrically connected. The synthetic resin sheets 2a and 2b are made of a material having insulating properties, alkali resistance, and appropriate strength. For this, polyester resins such as PET, acrylic resins, vinyl resins, and the like are suitable. Can be used. The RFID tag 1 is a non-contact type battery-less type that can transmit and receive signals such as commands and data without contact with an input / output device (not shown). The IC module layer 10 has an IC module in which an IC chip 3 and a loop antenna 4 are supported on an insulating substrate 9 placed in a non-alkali soluble adhesive that joins the upper and lower synthetic resin sheets 2a and 2b to each other. It is also possible to configure.

  As shown in FIG. 3, the reversible thermosensitive recording layer 5 provided on one surface of the outer package 2 includes a sheet-like paper substrate 6 and a reversible thermosensitive recording material 7 coated on the sheet-like paper substrate 6. And. Examples of the reversible thermosensitive recording material 7 include a leuco compound type in which a leuco dye and a developer are dispersed in a resin binder together with various additives, and a polymer in which an organic low molecule is dispersed in a resin binder. / A low molecular weight type can be suitably used. A transparent overcoat layer (not shown) for protecting the reversible thermosensitive recording material 7 is provided on the reversible thermosensitive recording material 7 as necessary.

  An adhesive layer 8 formed by uniformly applying an alkali-soluble adhesive is formed on the lower surface of the sheet-like paper base 6, and the reversible thermosensitive recording layer 5 is packaged by the adhesive force of the adhesive layer 8. It is made to join to one side of the body 2. The alkali-soluble pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 8 is dissolved by an alkaline aqueous solution having a pH of 9 or more. Examples of such alkali-soluble pressure-sensitive adhesive include synthetic rubber such as acrylic rubber and butadiene-styrene rubber, or natural rubber. A rubber-based pressure-sensitive adhesive mainly composed of rubber, or an acrylic pressure-sensitive adhesive mainly composed of acrylic acid, butyl acrylate or the like can be used. The alkaline aqueous solution used for dissolving the alkali-soluble pressure-sensitive adhesive is not particularly limited, but an aqueous solution of sodium hydroxide or sodium carbonate can be preferably used.

  Then, by joining the reversible thermosensitive recording layer 5 to one surface of the outer package 2 using the pressure-sensitive adhesive layer 8 made of such an alkali-soluble pressure-sensitive adhesive, the reversible feeling is obtained through the easy solubility of the alkali-soluble pressure-sensitive adhesive. The thermal recording layer 5 can be exchanged.

  In such a configuration, when the reversible thermosensitive recording layer 5 deteriorates due to use, the RFID tag 1 is immersed in an alkaline aqueous solution having a pH of 9 or more, preferably pH 11 or more, and the adhesive layer 8 of the reversible thermosensitive recording layer 5 is used. The degraded reversible thermosensitive recording layer 5 can be easily removed from the outer package 2 by dissolving the alkali-soluble pressure-sensitive adhesive that constitutes. At this time, the dissolving action can be promoted by heating the alkaline aqueous solution to an appropriate temperature, for example, about 40 to 90 ° C. In addition, when the temperature of alkaline aqueous solution is less than 40 degreeC, since the melt | dissolution promotion effect is not acquired, it is unpreferable, and since the malfunction that the exterior body 2 deform | transforms will arise when it exceeds 90 degreeC.

  After removing the deteriorated reversible thermosensitive recording layer 5 as described above, if the RFID tag 1 is washed and dried, the new reversible thermosensitive recording layer 5 is re-bonded to the outer package 2 of the RFID tag 1. be able to. Since the reversible thermosensitive recording layer 5 can be exchanged as many times as necessary, the product life can be extended to the limit of data update of the RFID tag 1, and the RFID tag can be shortened in a short cycle. The total cost can be reduced as compared with the case where 1 is replaced.

  Further, since the sheet-like paper base 6 is used as the base of the reversible thermosensitive recording layer 5, an alkaline aqueous solution penetrating action can be obtained over the entire base, compared with the case where a synthetic resin base is used. In addition, the alkali-soluble pressure-sensitive adhesive on the lower surface side of the base material can be dissolved quickly and smoothly, and the reversible thermosensitive recording layer 5 using the sheet-like paper base material 6 uses a base material made of a synthetic resin. Since it is cheaper, product production costs can be reduced.

  Further, since the alkali-soluble pressure-sensitive adhesive is dissolved in an alkaline aqueous solution having a pH of 9 or higher, it is not dissolved in alkaline water close to neutrality. Therefore, the reversible thermosensitive recording layer 5 due to adhesion of these water during operation is used. Unnecessary peeling can be surely prevented.

1 is a schematic longitudinal sectional view of an RFID tag 1 according to the present invention. It is a model top view of RFID tag 1 same as the above. It is a model longitudinal cross-sectional view of the RFID tag 1 same as the above which shows the state which isolate | separated the reversible thermosensitive recording layer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 RFID tag 2 Exterior body 3 IC chip 4 Loop antenna 5 Reversible thermosensitive recording layer 6 Sheet-like paper base material 7 Reversible thermosensitive recording material 8 Adhesive layer (alkali-soluble adhesive)

Claims (2)

In an RFID tag in which an IC chip and a loop antenna are incorporated in an exterior body, and a reversible thermosensitive recording layer is provided on one surface of the exterior body,
The reversible thermosensitive recording layer comprises a sheet-like paper substrate and a reversible thermosensitive recording material coated on the sheet-like paper substrate, and an alkali that dissolves the lower surface of the sheet-like paper substrate with an alkaline aqueous solution. An RFID tag characterized in that a reversible thermosensitive recording layer can be exchanged through easy solubility of an alkali-soluble adhesive by bonding to one surface of an exterior body with a soluble adhesive.   2. The RFID tag according to claim 1, wherein the alkali-soluble pressure-sensitive adhesive is dissolved in an alkaline aqueous solution having a pH of 9 or more.

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