JP5393541B2 - Embedded IC tag and embedded IC tag signal detection method - Google Patents

Description

The present invention relates to an embedded IC tag that is embedded and managed in concrete, mortar, cement admixture, and the like, and a method for detecting an embedded IC tag signal.

IC tags are used in quality control and physical distribution management of cement compositions such as concrete, mortar, and cement admixtures.

The IC tag is used for electronic money, entrance / exit management, or attached to an object for traceability and quality control in physical distribution. The IC tag is used for exchanging individual IDs and various information between the IC tag and an external reading device by wireless communication. However, an antenna is required in the IC tag because radio waves are used. An antenna in wireless communication has directivity and a polarization plane in any direction in a three-dimensional space, and is affected by the frequency of a radio wave as a high frequency power source supplied to the antenna, the antenna shape, the surrounding environment, and the like. . When directivity is given in a specific direction, gain is obtained in a specific direction, which is advantageous in communication between two points, and the communication distance can be extended. If the gain or the radiation in a direction other than a specific direction is reduced by having the communication distance, the communication distance becomes short and communication becomes difficult.

  In order to deal with such problems, it is usual to increase the efficiency of the antenna, as well as to use the antenna directivity or increase the directivity according to the usage, and to change the antenna according to the directivity. To ensure stable communication.

As for the IC tag, the built-in antenna usually has directivity, so that stable communication is possible in a specific direction. On the other hand, communication may be difficult depending on the direction. Therefore, in the use of an IC tag, the IC tag is usually held or attached so that the direction of the antenna of the external reading device is directed to the direction of the directivity of the IC tag.
On the other hand, when using an IC tag for concrete quality control, an IC tag having a wide directivity is known (Patent Document 1).

JP 2009-282688 A

When using an IC tag that is directional to cement composition for quality control and traceability of cement composition such as concrete, mortar and cement admixture, the cement composition has fluidity before curing. When the direction of the IC tag is not determined and the IC tag is randomly arranged after curing, it is possible to read / write from a specific direction, but it is expected that communication cannot be performed.

Furthermore, it is possible to suppress the directivity as much as possible by the antenna design, but by making it non-directional in this way, radio waves are radiated in all directions and energy is dispersed, so the communication distance is reduced overall. There is a problem such as.

The present invention solves these problems, and in the case of using an IC tag mixed in a cement composition, in particular, in a construction for performing vibration compaction, a communication distance is secured using an IC tag having directivity, It enables stable communication. The IC tag is embedded in the cement composition, and the reading distance of the IC tag ID and various information is read and written using an external reading device, the communication distance is improved, and the external reading device before or after the cement composition is cured. The problem was to make it easier to read.

An IC tag including an IC tag LSI, a directional antenna, and a covering body incorporating these, wherein a buffer layer having a smaller dynamic elastic modulus than the covering body is provided on a part of the side surface of the covering body. radio wave radiation antenna connected to the LSI, concrete, characterized in that have a component perpendicular to the plane of the buffer layer, mortar, or cement hardened body embedded IC tag to provide.

The IC tag is characterized in that the covering has an elliptical spherical shape, an elliptical columnar shape, or a polygonal columnar shape.

The material of the covering body is a resin or cement kneaded product, the position of the center of gravity of the IC tag, ellipsoidal or not the center of the elliptical cylindrical or multi-prismatic and is coated body, the cement composition of the punching設時The IC tag described above is characterized by being oriented in the direction of the center of gravity when viewed from the center of the IC tag.
The side surface of the covering body on which the buffer layer is not provided has at least two direction control plates provided so as to reduce resistance against movement of the IC tag in the normal direction of the surface of the buffer layer. IC tag.

An IC tag including an IC tag LSI, a directional antenna, and a covering body incorporating these, wherein the covering body is provided with a buffer layer, and the radiation direction of the radio wave of the antenna connected to the IC tag LSI is determined by the buffer layer Having a component in the normal direction of the surface of the surface, and injecting into the cement composition at the time of placing, orienting the surface side of the buffer layer to the vibration surface by vibration of the vibration compaction of the cement composition, There is provided an IC tag signal detection method characterized by detecting a radiation component in a normal direction of a surface of a layer.

Thus, the IC tag having a radiation component in the normal direction of the surface of the buffer layer and provided with the buffer layer on the side surface is put into the cement composition at the time of placing, and by vibration of the vibration compaction of the cement composition, It is possible to provide an IC tag in which the side surface of the covering body is oriented to the vibration surface, or the IC tag is further moved by vibration in the vibration direction and the radiation component in the normal direction can be detected.

Here, the radio wave from the antenna can be indicated by the radiation direction and the radiation intensity of the radio wave. This varies depending on the shape of the antenna and the frequency band used. Usually, as a relationship between the radiation angle and the radiation intensity, for example, in the case of a transmission antenna, the position of the transmission antenna is changed up and down, left and right, and the intensity ratio of radio waves obtained by the consultation antenna is indicated as decibel (dB). Shown in the sex diagram.

Since the radiation of radio waves is spatial, it usually shows directivity with three-dimensional radiation. However, for example, a case where a radio wave is radiated at an angle of 360 ° with respect to a specific surface such as a dipole antenna may be non-directional, and an IC tag transmits using received radio wave energy. Therefore, when the directivity of the antenna is shown as radiation intensity, it may not match the actual communicable distance, which is not practical, and there is also a problem that the polarization plane of the radio wave affects.

The IC tag of the present invention is an IC tag provided with a buffer layer, and has a radiation component at least in the normal direction of the surface of the buffer layer. FIG. 1 shows an example of a spiral tag antenna 10. The tag antenna has a spiral shape on the plane 101 on the yz plane. This antenna has a component of radiation intensity in the x-axis direction. Further, as shown in FIG. 1, the center of the circle as the bottom surface was covered with a cylindrical covering body having the z axis, and the buffer layer 20 was provided on the side surface of the positive portion of the x axis. In this way, an IC tag can be obtained in which the radiation of the radio wave of the antenna connected to the IC tag LSI has a radiation component in the normal direction of the surface of the buffer layer.

In the present invention, since the antenna built in the IC tag has directivity in a specific direction, it is preferable that the directivity of the antenna does not become a non-directional spherical shape as a whole.

However, an omnidirectional antenna can also be used if it has a radiation component in the normal direction of the buffer layer surface.

The IC tag is preferably the IC tag characterized in that the covering is elliptical, elliptical, or polygonal. At this time, it is easy to stand the column in the vertical direction in the cement composition by adjusting the center of gravity of the columnar covering.

The material of the covering is resin or cement kneaded material, and the position of the center of gravity of the IC tag using the difference in specific gravity is adjusted, and the center portion of the elliptical spherical shape, elliptical cylindrical shape, or polygonal cylindrical shape is removed and set. In the cement composition at the time of casting, the longitudinal direction of the IC tag can be oriented in the depth direction. At this time, it is easy to stand the column in the vertical direction in the cement composition by adjusting the center of gravity of the elliptical or columnar covering.

The buffer layer is provided so that the dynamic elastic modulus is smaller than that of the other side surface of the covering body where the buffer layer is not provided. As the buffer layer, an air layer, rubber or the like having a low Young's modulus or a non-rigid material can be selected. For example, a cement composition such as mortar having a Young's modulus of 10 GPa to 50 GPa or a resin such as polyethylene having a Young's modulus of 1 GPa to 4 GPa is used as a coating, and the Young's modulus is 0.5 GPa or less, more preferably 0.1 GPa or less. It is. It is preferable to provide one or more buffer layers such as rubber or air. Moreover, it is preferable that the thickness of a buffer layer is 0.1 mm-5 mm. In the case of an air layer, for example, an air cap that traps and uses air can also be used. In one direction of the IC tag cover, the area of the coated side surface is preferably 1/2 to 1/4 of the area of the entire side surface.

For example, the air cap layer can be used on the side surface of the cylindrical tag cover. In the cylindrical tag, the longitudinal direction of the IC tag can be oriented in the depth direction in the cement composition at the time of placement by adjusting the position of the center of gravity. For example, a cylindrical covering is provided with a hollow part, the upper part is a gap, and the lower part is attached with a weight of an inorganic heavy aggregate such as iron ore, stainless steel, lead, alumina, zirconia, etc. It can be used as a float, sink or float in the cement composition while keeping the cylinder vertical in the object.

At this time, if the buffer layer with a low Young's modulus is part of the surface layer of the side surface of the IC tag, when the vibration is compacted, the buffer layer with a low Young's modulus matches the vibration surface with respect to the IC tag vibration direction. Thus, the buffer layer side of the IC tag side surface could be directed to the vibration surface in the cement composition. In addition, when the buffer layer with a low Young's modulus is thus oriented in the direction of the vibrator, the phase difference between the cement composition and the IC tag is generated, and a force is generated in the vibration direction from the back of the IC tag. I was able to move in the direction of the machine.

An IC tag can be provided with a specific gravity difference and can be oriented in a certain direction with respect to the vertical direction in the cement composition. When the vibration surface of the vibrator is a plane or curved surface including a vertical line, by providing the buffer layer 20 on the side surface of the IC tag that does not intersect the vibration surface, the side surface of the IC tag is directed in the vibration direction. I was able to.

Further, by providing two or more directional control plates 30 shown in FIG. 2 on the covering body, the control was made to smoothly face the vibration surface and the vibration surface was moved closer to the epicenter. The direction control plate has a width of 0.5 mm to 10 mm, more preferably a width of 2 mm or more, and the thickness is not particularly limited, but is 0.1 mm to 1.0 mm, and is attached to the side of the cover other than the surface having the buffer layer. In addition, it is preferable that the IC tag is attached so that the resistance is minimized in the movement in the normal direction of the surface having the buffer layer.

As the vibrator, a concrete rod vibrator and a concrete mold vibrator were used. The frequency is desirably 800 vpm to 15000 vpm, and more desirably 1000 vpm to 5000 vpm. The vibration may include a longitudinal wave component, and the direction of the IC tag can be easily controlled by the action of the longitudinal wave and the buffer layer. This vibration also gives vibration to the fine aggregate and coarse aggregate in the cement composition, and the IC tag easily moves, and the IC tag itself vibrates, thereby causing direction control and movement of the IC tag itself. .

Thus, an IC tag including an IC tag LSI, a directional antenna, and a covering body incorporating these, and the radio wave of the antenna connected to the IC tag LSI has a radiation component in the normal direction of the surface of the buffer layer. Thus, it is possible to easily secure the communication distance in the direction in which vibration is applied. In FIG. 1, it has a normal radiation component on the side surface of the covering in the x-axis direction. An IC tag provided with a buffer layer on this side surface is put into the cement composition at the time of casting, and the side surface of the covering body is oriented to the vibration surface by vibration of the cement composition. The radiant component of the signal can be detected.

As described above, according to the present invention, the tag information can be easily read from the external reading device before or after the cement composition for vibration compaction is cured.

The schematic diagram which shows an example of the internal structure of this invention. The top view and schematic diagram which show an example of the structure of this invention. The schematic diagram which shows an example of the buffer part of this invention.

Hereinafter, embodiments of the present invention will be specifically described. The present invention is an IC tag having an IC tag covering in which a buffer layer having a different Young's modulus is provided on the IC tag, wherein the IC tag antenna directivity is set in advance in an arbitrary direction.

One buffer layer having a Young's modulus of 0.1 GPa or less was provided in one direction of the IC tag cover. 1/3 of the total area is covered, and the thickness of the buffer layer is 0.5 mm to 5 mm. As the layer, an air cap used to confine air was used.

At this time, since the buffer layer having a low Young's modulus is on the surface of the IC tag, the force that causes the buffer layer having a low Young's modulus to coincide with the vibration surface acts on the vibration direction, and the direction in the fluid is changed to the buffer layer vibration surface. Control can be directed. In addition, when the buffer layer having a low Young's modulus faces the IC tag in the direction of the vibrator, a phase difference occurs between the cement composition and the IC tag, a force is generated in the vibration direction from the back of the IC tag, and the IC tag itself is in the direction of the vibrator. Moved to.

An IC tag can be provided with a specific gravity difference and can be oriented in a certain direction with respect to the vertical direction in the cement composition. When the vibration surface of the vibrator is a plane or curved surface including a vertical line, the side surface of the IC tag can be oriented in the vibration direction by providing a buffer layer on the side surface of the IC tag that does not intersect the vibration surface. did it.

In addition, by providing two or more directional control plates with a width of 2 mm or more on the covering, control was made to make the surface more smoothly directed to the vibration surface, and the vibration surface was moved closer to the epicenter.

As the vibrator, a concrete rod vibrator and a concrete mold vibrator were used. The frequency is desirably 800 vpm to 15000 vpm, and more desirably 1000 vpm to 5000 vpm.

IC tag LSI and IC tag antenna used The IC tag LSI and IC tag antenna installed in the IC tag were connected in advance, and the IC tag LSI used the 950 MHz band. The IC tag antenna is formed in a spiral shape (loop shape) on a 1.5 cm x 3.5 cm surface, and corresponds to a card type IC tag, and has directivity in a direction perpendicular to the antenna surface. It is what you have.

The IC tag LSI and IC tag antenna were previously thinly coated with a silicone resin in order to prevent damage during formation. The molding was a cylindrical shape of φ2 cm x height 4 cm. Two-layer molding of an upper layer portion of 2 cm and a lower layer portion of 2 cm was performed, and the upper layer portion and the lower layer portion were F and A in Table 1, respectively. As a buffer layer, an air cap (three-layer structure, particle size 10 mm, particle height 3.5 mm product) or silicon sponge sheet (thickness 2 mm, apparent specific gravity about 0.3) is 3.5 cm x 3.5 cm. It cut | disconnected and it affixed on the side surface shape | molded in the cylindrical shape using the instantaneous adhesive agent, and was set as the IC tag (IC tag No. 1 and IC tag No. 2 respectively). The buffer layer is attached in the direction with the strongest IC tag directivity.

In addition, IC tag No. 1, a styrene resin plate having a width of 0.4 cm, a length of 4 cm, and a thickness of 0.3 mm as a direction control plate was attached to the IC tag using hot melt. 3 was produced. Similarly, an IC tag (IC tag No. 4) that does not use the buffer layer and the direction control plate was manufactured.

For confirmation of communication, a concrete wall surface was simulated as a concrete composition, and ordinary concrete with a slump of 18 cm and a design standard strength of 24 N / mm 2 was placed in a wooden form panel having a width of 20 cm, a length of 80 cm, and a height of 80 cm. Performed in the cement composition. Here, the panel surface of 80 cm x 80 cm is hereinafter referred to as a wall surface. Next, the two types of IC tags were embedded at a depth of about 10 cm and at the center in the length direction so that the surface of the buffer layer was in the same direction as the length direction, that is, perpendicular to the wall surface.

In the comparative IC tags, the direction without the directivity of the IC tag antenna was embedded in the wall surface. In this state, any IC tag cannot communicate with the IC tag using the external reading device from the wall surface.

Next, a mold vibration machine in which a slidac was inserted in advance and the frequency was adjusted to about 2500 vpm was attached to one central portion of the wooden mold wall surface, and vibration was applied for 30 seconds. As a result, the IC tag no. 1 and no. Only 2 could read the IC tag ID. Further, when vibration was applied in the same manner for 1 minute, no. 1, no. 2, no. No. 3 tag can be read. No. 3 has a 6 cm distance from the wooden formwork to the external reading device antenna. 1 and no. While the 2 tags were 2 cm each, the communication distance became longer.

Claims (5)

An IC tag including an IC tag LSI, a directional antenna, and a covering body incorporating these, and a buffer layer having a smaller dynamic elastic modulus than that of the covering body is provided on a part of the side surface of the covering body, the radio wave radiating antenna, concrete, characterized in that have a component perpendicular to the plane of the buffer layer, mortar, or cement hardened body embedded IC tag to be connected to the IC tag LSI. 2. The IC tag according to claim 1, wherein the covering is elliptical, elliptical, or polygonal. In IC tag according to claim 2, the material of the covering member is a resin or cement kneaded product, the position of the center of gravity of the IC tag, the spheroidal or of the covering body elliptical cylindrical or a multi-prismatic not in the center, the cement compositions in droplet設時, it characterized by orienting the centroid direction viewed from the center of the IC tag I C tag. At least two direction control plates provided to reduce resistance against movement of the IC tag in a normal direction of the surface of the buffer layer on a side surface of the covering body where the buffer layer is not provided. The IC tag according to any one of claims 1 to 3.   An IC tag including an IC tag LSI, a directional antenna, and a covering body incorporating these, wherein the covering body is provided with a buffer layer, and the radiation direction of the radio wave of the antenna connected to the IC tag LSI is determined by the buffer layer Having a component in the normal direction of the surface of the surface, and injecting into the cement composition at the time of placing, orienting the surface side of the buffer layer to the vibration surface by vibration of the vibration compaction of the cement composition, A method for detecting an IC tag signal, comprising detecting a radiation component in a normal direction of a surface of a layer.