JP3167316U - Heat-resistant RFID tag - Google Patents

Abstract

An RFID tag used for identifying an article in an environment exposed to a high temperature such as a production process, wherein the RFID tag is arranged so as not to be overturned or blown off by a cooling wind for cooling equipment. I will provide a. A plurality of metal thin plates (21, 22) are stacked via an air layer (32), and the windward end and the leeward end of a thin plate (21) arranged closest to an object are targeted. By bending each to the object side, a leg 23 is formed, the tip of which is in contact with the object. [Selection] Figure 2

Description

  The present invention relates to a heat-resistant RFID tag used for identification of an article in an environment exposed to a high temperature such as a production process.

  In recent years, RFID tags (Radio Frequency IDentification tags) are frequently used for identification of articles. The operating temperature range of the RFID tag is based on the heat resistance performance of a semiconductor chip or a resin film-like substrate constituting the RFID tag, and is normally limited to a temperature range of −40 ° C. to 85 ° C. If the RFID tag is used at a high temperature, the circuit included in the semiconductor chip may be destroyed, the stored data may be erased, wrinkles may be generated on the film substrate, or the film may be melted.

  Therefore, Patent Document 1 discloses a non-contact ID tag body having three metal thin plates stacked at a predetermined interval and a non-contact ID tag body disposed on a thin plate farthest from a high-temperature object. An ID tag is disclosed. Since a plurality of thin plates and an air layer between the thin plates are arranged between the non-contact ID tag main body and the object, the influence of heat conduction and radiant heat from the object is suppressed, so the temperature of the non-contact ID tag main body Is kept within the operating temperature range, and the non-contact ID tag can be operated normally.

Registered Utility Model No. 3156147

  By the way, in order to cool a high temperature target object at an early stage, wind may be applied to the target object. In the non-contact ID tag described in Patent Document 1, when a wind is received from the side, a large wind load is generated on the side surface, and thus there is a risk of overturning or blowing away.

  An object of the present invention is to provide a heat-resistant RFID tag that can hardly be tumbled or blown away.

  The heat-resistant RFID tag according to the present invention is a heat-resistant RFID tag that is used in a state of being placed on a high-temperature object and receives wind from the side, and includes a plurality of metal thin plates stacked via an air layer, A tag body provided on a thin plate disposed at a position farthest from the object, and provided with a semiconductor chip for storing data and capable of transmitting and receiving data in a non-contact manner; and A leeward end and a leeward end of the thin plate disposed at the closest position are bent to the object side, and a leg portion is in contact with the object. And

  According to the above configuration, when the heat-resistant RFID tag receives wind from the side, the wind passes between the object and the thin plate and between the thin plate and the thin plate. At that time, the wind is bent upward at the windward leg portion, and the windward leg portion is pressed against the object, so that friction between the heat-resistant RFID tag and the object increases. Thereby, when a wind is received from the side, a large wind load does not act on the side surface of the heat-resistant RFID tag, so that it is difficult to roll over or blow away.

  In the heat-resistant RFID tag according to the present invention, the plurality of thin plates may constitute a planar antenna that transmits and receives the data. According to the above configuration, since the plurality of thin plates constitute a planar antenna that transmits and receives data, the heat-resistant RFID tag is more sensitive than the tag body. Therefore, since the transmission / reception distance of the heat-resistant RFID tag is longer than the transmission / reception distance of the tag body, the heat-resistant RFID tag can be detected even from a distance where the RFID reader cannot detect the tag body.

  In the heat-resistant RFID tag according to the present invention, the thin plate above the thin plate on which the leg portion is formed and the tag main body may be positioned between the two leg portions in the horizontal direction. According to the above configuration, when a plurality of heat-resistant RFID tags are stacked in the laminating direction of the thin plates, the thin plate above the thin plate on which the leg portions are formed and the tag body are two adjacent heat-resistant RFID tags. Fits comfortably between legs. Therefore, a large number of heat resistant RFID tags can be stored in a narrow space when the heat resistant RFID tag is stored.

  In the heat-resistant RFID tag according to the present invention, the plurality of thin plates may be made of stainless steel. According to said structure, since the emissivity and absorption factor of infrared rays (heat ray) are as few as about 0.3 in wavelength 2500nm, stainless steel can suppress the influence of the radiant heat from a target object to a tag main body.

  In the heat-resistant RFID tag according to the present invention, the plurality of thin plates may be made of aluminum. According to said structure, since the emissivity and absorption factor of infrared rays (heat ray) are as small as about 0.1 in wavelength 2500nm, aluminum can suppress the influence of the radiant heat from a target object to a tag main body. In addition, since aluminum has a higher infrared reflectance than stainless steel, radiant heat can be greatly reduced, and a greater heat insulating property can be obtained.

  According to the heat-resistant RFID tag of the present invention, when the wind is received from the side, the wind is bent upward at the windward leg, and the windward leg is pressed against the object. Increases friction with the object. Thereby, when a wind is received from the side, a large wind load does not act on the side surface of the heat-resistant RFID tag, so that it is difficult to roll over or blow away.

It is a figure which shows the state in which the heat-resistant RFID tag was mounted on the target object. It is a figure which shows a heat-resistant RFID tag, (a) is a side view, (b) is a top view, (c) is a front view. It is a figure which shows a thin plate, (a) is a side view, (b) is a top view, (c) is a front view. It is a figure showing the state where a plurality of heat-resistant RFID tags were piled up.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

(Configuration of heat-resistant RFID tag)
The heat-resistant RFID tag 1 according to the embodiment of the present invention is used while being placed on a high-temperature object 10. For example, as shown in FIG. 1, the heat-resistant RFID tag 1 is placed inside an aluminum hot-rolled coil that is a high-temperature object 10. An aluminum hot-rolled coil is formed by winding aluminum having a thickness of about 10 mm in a cylindrical shape like toilet paper. The inner diameter of the core portion is about φ600 mm, the outer diameter is about φ1400 mm, and the depth is about 1600 mm. . And the temperature of the hot-rolled coil immediately after hot rolling (heating to a high temperature and rolling) is a very high temperature of around 350 ° C. In order to cool such an object 10 at an early stage, a wind of 1 m / s to 20 m / s is applied to the object 10 by a turbo fan or the like. Thereby, the heat-resistant RFID tag 1 receives wind from the side. The object 10 is not limited to an aluminum hot-rolled coil, and may be a machine or a furnace body that operates at a high temperature.

  As shown in FIG. 2, the heat resistant RFID tag 1 includes a heat resistant base 20 and a tag body 2. The heat-resistant base 20 includes two thin plates 21 and 22 made of stainless steel, laminated in the Z direction via an air layer 32, stainless steel legs 23, and two spacers 24 made of PPS (polyphenylene sulfide) resin. And have. The heat-resistant base 20 of this embodiment has a depth of 200 mm, a width of 100 mm, and a thickness of 30 mm.

  As shown in FIG. 2A, which is a side view, the leg 23 has an end on the windward side and an end on the leeward side of the thin plate 21 arranged at the closest position to the object 10 (the object 10 side ( It is formed by being bent at about 30 ° (below in the Z direction). Here, the direction of the wind received from the side by the heat-resistant RFID tag 1 is the Y direction. As a result, the tip of the leg 23 comes into contact with the object 10, so that an air layer 31 is formed between the object 10 and the thin plate 21.

  The thin plate 22 arranged at the farthest position with respect to the object 10 includes two divided plates 22a and 22b as shown in FIG. These divided plates 22 a and 22 b are arranged at a predetermined interval, and are respectively supported by two spacers 25 and one spacer 24 on the thin plate 21.

  As shown in FIG. 3, the spacer 25 is formed by bending the tongue 25a formed by providing a slit in each of the dividing plates 22a and 22b by 90 ° in the Z direction and bending the center by 90 ° in the Y direction. It is formed in a letter shape. In FIG. 2, each spacer 25 is spot welded to the thin plate 21. Thus, by forming the spacer 25 with the tongue portion 25a formed on each of the divided plates 22a and 22b, the number of parts can be reduced and the cost can be reduced. Further, by spot welding the spacer 25 to the thin plate 21, even if the heat-resistant RFID tag 1 is dropped from a certain height, it can be made difficult to break.

  The spacer 24 and the thin plate 21 are formed with internal thread portions so as to penetrate the upper and lower surfaces. By aligning both the internal thread portions and the counterbore holes formed in the thin plate 22 and screwing the external thread portion, the spacer 24 is formed. It is screwed to the thin plate 21 together with the divided plates 22a and 22b. The spacer 25 and the spacer 24 form an air layer 32 between the two thin plates 21 and 22. The spacer 24 may be made of a material other than the PPS resin as long as the heat insulating performance is high to some extent.

  As shown in FIG. 2B, which is a top view, the tag main body 2 includes a UHF band RFID inlay 2a that includes a semiconductor chip for storing data and that transmits and receives data without contact. The UHF band RFID inlay 2a is configured such that an antenna is formed of an electric conductor such as copper or silver paste on a film such as PET (polyethylene terephthalate) resin, and a semiconductor chip is mounted at the center thereof. As this UHF band RFID inlay 2a, for example, a product made by UPM Raflatac can be used. The tag main body 2 in this embodiment is a resin label having a depth of 160 mm, a width of 100 mm, and a thickness of 100 μm, in which a UHF band RFID inlay 2a is mounted at the center. The tag body 2 is attached to the upper surface of the thin plate 22. Specifically, it is attached to each of the upper surfaces of the two divided plates 22a and 22b so as to straddle the two divided plates 22a and 22b. Here, since there are no irregularities on the upper surfaces of the divided plates 22a and 22b, the label-like tag body 2 can be easily attached to the divided plates 22a and 22b and can be easily peeled off from the divided plates 22a and 22b. Further, since the tag body 2 is made of resin, it is difficult to tear. The tag body 2 may be a non-woven fabric label that is difficult to tear. Further, by making the adhesive of the tag main body 2 weakly viscous, it is possible to facilitate the replacement.

  Here, the thin plate 21 and the divided plates 22a and 22b constitute a differential patch antenna, which is a kind of planar antenna, and are designed to resonate at 953 MHz which is a transmission frequency of a UHF band RFID reader (not shown). ing. The dividing plates 22a and 22b and the UHF band RFID inlay 2a are connected with capacitance through a PET resin. For this reason, an electric field in which the electric field received by the differential patch antenna from the UHF band RFID reader is strengthened by resonance is applied to the UHF band RFID inlay 2a attached to the dividing plates 22a and 22b. Therefore, the heat resistant RFID tag 1 is more sensitive than the UHF band RFID inlay 2a, and the transmission / reception distance of the heat resistant RFID tag 1 is longer than the transmission / reception distance of the UHF band RFID inlay 2a. The size of the dividing plates 22a and 22b and the distance between them may be changed as appropriate according to the frequency to be resonated.

  Further, as shown in FIG. 2A, the thin plate 22 and the tag main body 2 above the thin plate 21 on which the leg portion 23 is formed are positioned between the two leg portions 23 in the horizontal direction (Y direction). is doing. Therefore, as shown in FIG. 4, when the plurality of heat-resistant RFID tags 1 are stacked in the stacking direction (Z direction) of the thin plates 21 and 22, the thin plate 22 and the tag body 2 of the heat-resistant RFID tag 1 are adjacent to each other. It fits perfectly between the two legs 23 of the heat-resistant RFID tag 1.

  In such a configuration of the heat-resistant RFID tag 1, if the object 10 is at a high temperature, the heat-resistant RFID tag 1 is moved from the object 10 side (that is, the thin plate 21 side) by heat conduction from the object 10 and radiant heat due to heat rays. Heated sequentially. At this time, as shown to Fig.2 (a), between the target object 10 and the thin plate 21, and between the thin plate 21 and the thin plate 22, the air layers 31 and 32 with very large thermal resistance exist. So the heat insulation effect is getting bigger. Therefore, when the heat from the object 10 is transmitted toward the tag body 2 in the order of the air layer 31, the thin plate 21, the air layer 32, and the thin plate 22, the heat from the target object 10 is cooled. Here, although the tip of the leg portion 23 is in contact with the object 10, the heat resistance of stainless steel is relatively large, and the heat resistance of the air layer 31 between the thin plate 21 and the object 10 is also very large. The temperature above the leg portion 23 is lower than that of the object 10. In addition, since the thermal resistance of the stainless steel of the divided plates 22a and 22b and the spacer 25 is relatively large and the thermal resistance of the spacer 24 is very large, the temperature above the divided plates 22a and 22b is higher than that above the leg portion 23. The temperature becomes even lower. Further, the air layers 31 and 32 communicate with the outside, and when the wind from the outside passes between the object 10 and the thin plate 21 and between the thin plate 21 and the thin plate 22, the thin plates 21 and 22. Take heat away from the surface. Thereby, the influence of heat conduction and radiant heat from the object 10 is effectively suppressed, and the temperature of the tag body 2 is suppressed within the use temperature range, so that the heat resistant RFID tag 1 operates normally under high temperature conditions. .

  Moreover, since the heat-resistant RFID tag 1 is not brittle and does not use a heat insulating material such as Ibi wool that easily emits fibers and powders, it does not pollute the surrounding space even when used for a long time. Further, when the heat-resistant RFID tag 1 receives wind from the side, the wind passes between the object 10 and the thin plate 21 and between the thin plate 21 and the thin plate 22. At that time, the wind is bent upward at the windward side leg portion 23 and the windward side leg portion 23 is pressed against the object 10, thereby increasing friction between the heat-resistant RFID tag 1 and the object 10. Thereby, even if a maximum of 20 m / s wind hits from the side, a large wind load does not act on the heat-resistant RFID tag 1, so that it is difficult for the heat-resistant RFID tag 1 to roll over or blow away.

  Moreover, the transmission / reception distance of the heat-resistant RFID tag 1 becomes longer than the transmission / reception distance of the tag main body 2 by forming a planar antenna in which the plurality of thin plates 21 and 22 transmit and receive data. Thereby, the heat-resistant RFID tag 1 can be detected even from a distance where the RFID reader cannot detect the tag body 2.

  As shown in FIG. 4, when a plurality of heat-resistant RFID tags 1 are stacked in the Z direction, the thin plate 22 and the tag main body 2 are completely between the two leg portions 23 of the heat-resistant RFID tag 1 adjacent thereto. Therefore, when the heat-resistant RFID tag 1 is stored, a large number of heat-resistant RFID tags 1 can be stored in a narrow space.

  Moreover, since the stainless steel which comprises the thin plates 21 and 22 has the emissivity and absorptance of infrared rays (heat ray) as few as about 0.3 in wavelength 2500nm, it can suppress the influence of the radiant heat from the target object 10 suitably. it can. When the temperature of the object 10 is higher than 350 ° C., the surfaces of the stainless steel thin plates 21 and 22 are plated with a material having high infrared reflectance such as nickel, copper, silver, or gold, or aluminum. It is possible to obtain a larger heat insulating property by increasing the reflectance of infrared rays by coating with the like. A heat-resistant RFID tag 1 in which the surface of stainless steel was covered with aluminum foil was prototyped and a temperature test was performed. When the temperature of the object 10 was 309 ° C., the temperature of the leg 23 was 150 ° C., and the division plates 22a and 22b The temperature was 97 ° C., and the temperature of the tag body 2 was 78 ° C. That is, the temperature of the tag main body 2 was within the operating temperature range of −40 ° C. to 85 ° C.

  Moreover, although the two thin plates 21 and 22 are comprised from stainless steel, when the temperature of the target object 10 is 200 degrees C or less, you may be comprised from aluminum. Aluminum has an infrared (heat ray) emissivity and absorptance of about 0.1 at a wavelength of 2500 nm, and has a higher infrared reflectivity than stainless steel, so it can greatly reduce radiant heat and provide greater heat insulation. Sex can be obtained.

  The two thin plates 21 and 22 may be made of inexpensive iron. In this case, since the reflectance of iron infrared rays (heat rays) is lower than that of stainless steel, the surface is preferably plated with a material having high infrared reflectance such as nickel, copper, silver, gold, or coated with aluminum or the like. . Moreover, the two thin plates 21 and 22 may be comprised from metals, such as gold | metal | money, silver, and copper. Preferably, any material may be used as long as the emissivity and absorptance of heat rays (infrared rays) from the object 10 are 0.1 or less. If it carries out like this, the thin plates 21 and 22 will become difficult to be heated with the radiant heat from the target object 10. FIG. Moreover, you may employ | adopt for the thin plates 21 and 22 the board | plate material which plated the composite material which covered the surface of the heat-resistant resin with aluminum foil, and the above-mentioned metal material.

(effect)
As described above, according to the heat-resistant RFID tag 1 in the present embodiment, when the heat-resistant RFID tag 1 receives wind from the side, the wind is between the object 10 and the thin plate 21 and between the thin plate 21 and the thin plate 22. Pass through. At that time, the wind is bent upward at the windward side leg portion 23 and the windward side leg portion 23 is pressed against the object 10, thereby increasing friction between the heat-resistant RFID tag 1 and the object 10. Thereby, when a wind is received from the side, a large wind load does not act on the side surface of the heat-resistant RFID tag 1, so that it is difficult to roll over or blow off.

  In addition, since the plurality of thin plates 21 and 22 constitute a planar antenna that transmits and receives data, the heat-resistant RFID tag 1 is more sensitive than the tag body 2. Therefore, since the transmission / reception distance of the heat-resistant RFID tag 1 is longer than the transmission / reception distance of the tag body 2, the heat-resistant RFID tag 1 can be detected even from such a distance that the RFID reader cannot detect the tag body 2.

  As shown in FIG. 4, when a plurality of heat-resistant RFID tags 1 are stacked in the Z direction, the thin plate 22 and the tag body 2 above the thin plate 21 on which the leg portions 23 are formed are adjacent to each other. It fits comfortably between the two legs 23 of the RFID tag 1. Therefore, a large number of heat resistant RFID tags 1 can be stored in a narrow space when the heat resistant RFID tag 1 is stored.

  Further, the stainless steel constituting the thin plates 21 and 22 has an infrared (heat ray) emissivity and absorptance as low as about 0.3 at a wavelength of 2500 nm. be able to. When the thin plates 21 and 22 are made of aluminum, aluminum has a higher infrared reflectance than stainless steel, so that the radiant heat can be significantly reduced and a greater heat insulating property can be obtained.

(Modification of this embodiment)
The embodiment of the present invention has been described above, but only a specific example is illustrated, and the present invention is not particularly limited, and a specific configuration and the like can be appropriately changed in design. Further, the actions and effects described in the embodiments of the invention are merely a list of the most preferable actions and effects resulting from the present invention, and the actions and effects according to the present invention are described in the embodiments of the present invention. It is not limited to what was done.

  For example, in the above-described embodiment, two thin plates 21 and 22 are laminated, but three or more thin plates may be laminated. Further, the thin plate 22 may be constituted by three or more divided plates.

DESCRIPTION OF SYMBOLS 1 Heat-resistant RFID tag 2 Tag main body 2a UHF band RFID inlay 10 Target object 20 Heat-resistant base 21, 22 Thin plate 22a, 22b Dividing plate 23 Leg part 24, 25 Spacer 31, 32 Air layer

Claims (5)

A heat-resistant RFID tag that is used while placed on a high-temperature object and receives wind from the side,
A plurality of thin metal plates stacked via an air layer;
A tag body provided on a thin plate disposed at a position farthest from the object, and having a semiconductor chip for storing data and capable of transmitting and receiving data in a contactless manner;
Legs that are formed by bending the windward end and the leeward end of the thin plate disposed at a position closest to the object to the object side, and the tip is in contact with the object;
A heat-resistant RFID tag characterized by comprising:   The heat-resistant RFID tag according to claim 1, wherein the plurality of thin plates constitute a planar antenna that transmits and receives the data.   The heat-resistant RFID according to claim 1 or 2, wherein the thin plate above the thin plate on which the leg portion is formed and the tag main body are positioned between the two leg portions in the horizontal direction. tag.   The heat-resistant RFID tag according to any one of claims 1 to 3, wherein the plurality of thin plates are made of stainless steel.   The heat-resistant RFID tag according to any one of claims 1 to 3, wherein the plurality of thin plates are made of aluminum.

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