JP6401940B2 - Auxiliary equipment - Google Patents

Description

  The present invention relates to an auxiliary device for a reader / writer.

  Conventionally, it is known that an IC tag storing individual identification information is incorporated in a metal manhole cover, and information is read from the IC tag by a reader / writer or the like (for example, Patent Document 1).

JP 2014-080850 A

  By the way, when reading information from an IC tag incorporated in a metal manhole cover as shown in Patent Document 1, it must be close to a distance about the radius of the manhole cover (for example, about 5 to 10 cm from the assembly position) IC tag cannot be detected. FIG. 18 is a diagram showing the relationship between the adjacent distance d between the IC tags 222 and 223 of the adjacent manhole covers (for example, the manhole cover 720 for water supply and the manhole cover 721 for sewage) and the detectable distance h of the reader R. It is.

  As shown in FIG. 18, a manhole cover 720 for water supply and a manhole cover 721 for sewage are installed adjacent to each other. Here, the adjacent distance d between the IC tag 222 attached to the manhole cover 720 for drinking water and the IC tag 223 attached to the manhole cover 721 for sewage, the reader R and the IC tag 222 or the IC tag When the relationship with the detectable distance h up to 223 is h> d, there is a possibility that identification information of an IC tag different from the IC tag to be originally detected is erroneously detected.

  For example, if the reader R tries to detect the IC tags 222 and 223 from the vicinity of the middle point of the adjacent distance d, both IC tags 222 and 223 can be detected. Therefore, it is preferable to adjust the sensitivity of the reader R so that the sensitivity is 1/2 or less of the adjacent distance d.

  However, from the viewpoint of the operator side, if the sensitivity of the reader R is set low in order to prevent erroneous detection of the IC tag, the reader R is always detected close to the IC tags 222 and 223. There must be. FIG. 19 is a diagram illustrating a worker detection method A and a detection method B when the readers R1 and R2 are brought close to each other and the IC tag 231 is detected. As shown in the detection method A of FIG. 19, the operator needs to detect the identification information by bringing the reader R1 close to the IC tag 231 in a squatting posture. Alternatively, as shown in detection method B, the operator needs to detect the information of the IC tag 231 embedded in the manhole cover 730 by attaching the reader R to the tip of the rod ST.

  However, in the detection method A shown in FIG. 19, the operator's agility is lost, and if there is a passing vehicle around while detecting information from the IC tag 231, it is difficult to evacuate quickly from the spot. Further, in the detection method A, it is necessary for the worker to squat down for each manhole cover to be checked, and the physical load is high, and the efficiency of the work is impaired. The detection method B does not impair the operator's agility, but since the reader R2 is attached to the tip of the rod ST, the operability such as the button of the reader R2 is impaired, or a monitor screen is attached. If it is, it may be difficult to see. Further, since the reader R2 is attached to the tip of the rod ST, there is a risk that the reader R2 may collide and be damaged.

  SUMMARY OF THE INVENTION The present invention solves any of the above-described problems, and an object thereof is to provide an auxiliary device that can safely and easily read and write information with respect to an IC tag using a reader / writer. .

The present invention provides an auxiliary instrument for use with a reader / writer capable of reading and writing information to the IC tag, and the propagation means capable of propagating electric waves from the reader / writer, it is propagated by the propagation means A resonance facilitating means capable of facilitating resonance in the polarization direction of the IC tag based on the received radio wave, a buffer means integrated with the resonance facilitating means and having a certain thickness, a propagation means, and a resonance facilitating means; And a joining means having a support structure capable of changing a joining angle between the propagation means and the resonance facilitating means, and the support structure has two types of radio waves propagated by the propagation means. It has a structure that functions as a high-frequency branch circuit that branches in the direction .

  Further, the present invention is the auxiliary instrument described above, and the resonance facilitating means is preferably configured in a substantially disc shape.

Further, the present invention is the above-described invention , wherein a strip line is formed on the surface of the resonance facilitating means, or a quarter wavelength antenna is formed on the surface of the resonance facilitating means, as a high-frequency branch circuit. preferable.

  ADVANTAGE OF THE INVENTION According to this invention, the auxiliary | assistant instrument which can read and write information safely and easily using a reader / writer with respect to an IC tag can be provided.

Drawing 1 is a figure showing an example of use of auxiliary implement 1 concerning one embodiment of the present invention. FIG. 2 is a view showing a state where the metal rod 2 of the auxiliary instrument 1 of FIG. FIG. 3 is a diagram related to the booster unit 3 and the buffer member 11, (A) is a diagram illustrating a state in which the booster unit 3 and the manhole cover 7 are overlapped, and (B) is a diagram illustrating the booster unit 3 and the buffer member 11. The figure which showed the buffer member 11 integrated from the back surface, (C) is the cutting | disconnection end elevation of the booster part 3. FIG. FIG. 4 is a view showing a state where the booster unit 3 and the manhole cover 7 are overlapped from the viewpoint of the operator. FIG. 5 is a view showing radio waves radiated over the metal rod 2 and the booster unit 3 of the auxiliary instrument 1 of FIG. FIG. 6 is a diagram showing an image of radio wave sensitivity radiated when the metal rod 2 of the auxiliary instrument 1 of FIG. 1 is erected vertically. FIG. 7 is a diagram showing an image of radio wave sensitivity radiated when the metal rod 2 of the auxiliary instrument 1 of FIG. 1 is tilted obliquely. FIG. 8 is a diagram showing a method of detecting an IC tag when the manhole cover 7 is located under the vehicle 80 using the auxiliary instrument 1 of FIG. FIG. 9 is a diagram showing a method of detecting an IC tag from the manhole cover 7 through the guardrail 90 using the auxiliary instrument 1 of FIG. FIG. 10 is a diagram for explaining a problem caused by the relationship between the traveling direction of the surface wave propagating through the metal rod 2 and the polarization direction of the IC tag inside the manhole cover. FIG. 11 is a diagram illustrating an example of a device for solving the problem illustrated in FIG. 10. FIG. 12 is a view showing an example of a support structure incorporating the device of FIG. FIG. 13 is a view showing an example of another support structure incorporating the device of FIG. FIG. 14 is a view showing an example of another support structure incorporating the device of FIG. FIG. 15 is a view showing an example of another support structure incorporating the device of FIG. 11. FIG. 16 is an appearance of an auxiliary instrument 1A according to another embodiment of the present invention. FIG. 17 is a view showing a modification of the booster unit 3 of FIG. FIG. 18 is a diagram showing the relationship between the adjacent distance d between the IC tags 222 and 223 of the adjacent manhole covers (for example, the manhole cover 720 for water supply and the manhole cover 721 for sewage) and the detectable distance h of the reader R. It is. FIG. 19 is a diagram illustrating a worker detection method A and a detection method B when the readers R1 and R2 are brought close to each other and the IC tag 231 is detected.

  Hereinafter, an auxiliary instrument according to an embodiment of the present invention will be described. However, the auxiliary device of the present invention is not limited to the embodiments described below.

  Drawing 1 is a figure showing an example of use of auxiliary implement 1 concerning one embodiment of the present invention. As shown in FIG. 1, the auxiliary instrument 1 includes a metal rod 2, a booster part 3, a joint part 4, and a buffer member 11. Although not shown in FIG. 1, the IC tag is embedded in the manhole cover 7.

  The auxiliary device 1 is an auxiliary device used together with the reader / writer 6 in order to safely and easily read and write information with respect to the IC tag using the reader / writer 6. As shown in FIG. 1, the operator holds the auxiliary device 1 with the metal rod 2 with one hand, and the manhole cover on which the IC tag is attached to the booster portion 3 provided at the tip of the metal rod 2. 7 on top of each other. Then, the operator operates the reader / writer 6 with the other hand to radiate radio waves toward the manhole cover 7. There are roughly two communication paths between the IC tag and the reader / writer 6. One path is a direct path from the reader / writer 6 to which the radiated radio wave is directly applied to the booster unit 3 and reaches the IC tag directly below. Another path is a metal bar path mediated by the metal bar 2. Regarding the metal rod path, first, the reader / writer 6 and the metal rod 2 are close to each other within a palm-sized distance, and the radiated radio wave (circularly polarized wave or linearly polarized wave) from the reader / writer 6 is metal. Electromagnetic waves flow so as to travel along the surface of the rod 2. When this has proceeded to the connecting portion with the metal rod 2 of the booster portion 3, even if the connecting portion is insulated by the electrically separating resin, it is electromagnetically coupled by electromagnetic coupling in the vicinity. Accordingly, a metal rod path is formed in which electromagnetic waves are transmitted from the metal rod 2 to the surface of the metal portion (not shown) of the booster portion 3. The electromagnetic wave in the metal rod path resonates with the polarization in the direction on the extension line of the metal rod 2. When the polarization and the direction of the resonance polarization of the IC tag match, the reader / writer 6 can establish communication with good sensitivity to the IC tag and can read and write information. . In other words, since there are two IC tag communication paths using the auxiliary device 1, communication can be performed even when the IC tag is in an upward direction such as directly above, or in the direction of a metal rod path in which the auxiliary device is inclined or laid down. .

  The metal bar 2 is an example of a propagation means, for example, a stainless steel bar. Radiated radio waves (circularly polarized waves or linearly polarized waves) from the reader / writer 6 are propagated to the booster unit 3 over the surface of the metal rod 2. The metal bar 2 has a length about the height of the operator's waist from the ground so that information can be read from the IC tag without the operator squatting down. The metal bar 2 does not always need to be about the height of the waist from the ground. For example, the metal rod 2 may be configured to be stretchable.

  The booster part 3 is an example of a resonance facilitating means, and is attached via one end of the metal rod 2 and the joint part 4. The booster part 3 is composed of a plastic surface layer part 5 and a metal part 12 (FIG. 3). In order to promote the resonance of the IC tag attached to the manhole cover 7, the electromagnetic wave in the path of the metal rod 2 propagating along the surface of the metal rod 2 from the reader / writer 6 has a polarization direction and a booster portion of the IC tag. It is preferable to align the directions of polarized waves resonating with each other. Therefore, it is preferable that the metal part 12 functioning as an antenna of the booster part 3 is configured to expand into a circular shape and have a substantially disk shape. Accordingly, resonance can be promoted regardless of the polarization direction of the IC tag attached to the manhole cover 7. However, it may be limited to other shapes for reasons such as design and portability. Since the metal part functioning as an antenna of the booster part 3 can promote resonance with a half-wavelength, if the sensitivity is within a practically acceptable range, at least one side has a half side length. It may be an elongated plate having a wavelength dimension, or a polygonal shape (triangle, square, hexagon, etc.).

  The joint portion 4 is a support mechanism that joins the metal rod 2 and the booster portion 3 together. The joining part 4 can freely change the joining angle between the metal rod 2 and the booster part 3 (0 to 180 degrees). In addition, although the junction part 4 is joined with the intensity | strength which can maintain the joining angle with the metal rod 2, an operator can operate and can change the joining angle freely.

  The buffer member 11 is a member that is integrated with the booster unit 3 and absorbs an impact when coming into contact with the manhole cover 7. Further, the buffer member 11 has a certain thickness (for example, about 2 mm to 10 mm) necessary for electromagnetic coupling between the metal part 12 of the booster part 3 and the IC tag. The buffer member 11 is an insulating medium and is preferably composed of a porous material (for example, urethane resin) containing a lot of air. This is because shock absorption between the booster unit 3 and the manhole cover 7 can be absorbed even if pebbles are sandwiched between the manhole cover 7. Further, when the buffer member 11 contains a large amount of air, the shortening rate of the wavelength of the radio wave in the medium is equivalent to that in the air.

  The IC tag embedded in the manhole cover 7 in FIG. 1 is a so-called passive type RF tag, which incorporates an IC chip and a small antenna, and obtains electric power by receiving radiation waves from the reader / writer 6. At the same time, information transmitted from the reader / writer 6 can be recorded, and information recorded in a built-in memory can be read. Note that the structure and operating principle of the IC tag embedded in the manhole cover 7 is a known technique as disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2014-080850), and a detailed description thereof is omitted. To do.

  The reader / writer 6 is a device for reading and writing data by communicating with a so-called handy type IC tag that can be held and operated by an operator. The reader / writer 6 can read the individual identification information stored in the IC tag by wireless communication, and can write the individual identification information in the IC tag. The reader / writer 6 includes a display 6A, and the individual identification information read or information associated with the individual identification information can be displayed on the display 6A.

  The manhole cover 7 is used to allow workers to enter and exit from the ground for the management of underground sewers, underdrains, buried electrical and communication cables, and to enter and exit tools for operating underground valves from the ground. It is a metal lid for closing a vertical hole drilled in the ground. In the present embodiment, the manhole cover 7 is taken as an example, but other than the manhole cover.

  FIG. 2 is a view showing a state where the metal rod 2 of the auxiliary instrument 1 of FIG. As shown in FIG. 2, the auxiliary instrument 1 can be made to stand independently, for example, near the manhole cover 7. Therefore, it is not necessary to hang the auxiliary device 1 against the wall or to keep it always by the operator. Further, when the auxiliary tool 1 is not used, the metal rod 2 is simply kept vertical, and it is difficult to interfere with other work even at the work site.

  FIG. 3 is a diagram related to the booster unit 3 and the buffer member 11, (A) is a diagram illustrating a state in which the booster unit 3 and the manhole cover 7 are overlapped, and (B) is a diagram illustrating the booster unit 3 and the buffer member 11. The figure which showed the buffer member 11 integrated from the back surface, (C) is the cutting | disconnection end elevation of the booster part 3. FIG. As shown in FIG. 3, since there is a buffer member 11 (GAP) between the booster unit 3 and the manhole cover 7, it is possible to absorb an impact when the booster unit 3 contacts the manhole cover 7. Further, even if pebbles are sandwiched between the manhole cover 7, they can be absorbed. A plurality of sponges constituting the buffer member 11 are attached to the back side of the booster portion 3 as shown in FIG. Note that the shape and arrangement of the plurality of sponges constituting the buffer member 11 shown in FIG. 3B are merely examples, and other shapes and arrangements (for example, a disk shape, a donut shape, etc.) are also possible. Good. Further, the shapes of the booster portion 3 and the metal portion 12 may be long and narrow plate shapes or polygonal shapes (triangle, quadrangle, hexagon, etc.).

  FIG. 4 is a diagram showing the state in which the booster unit 3 and the manhole cover 7 are overlapped with each other from above. The diameter of the booster unit 3 is preferably about 15 cm when the resonance frequency is 920 MHz, but can be changed within an allowable range of ± 20% from this diameter. As shown in FIG. 4, the operator only has to operate the reader / writer 6 simply by superimposing the booster unit 3 on the manhole cover 7, so that the inspection of the manhole cover 7 is sequentially performed at a normal walking speed. It can be carried out.

  Next, radio wave sensitivity when the auxiliary instrument 1 is used will be described with reference to FIGS. FIG. 5 is a view showing radio waves radiated over the metal rod 2 and the booster unit 3 of the auxiliary instrument 1 of FIG. FIG. 6 is a diagram showing an image of radio wave sensitivity radiated when the metal rod 2 of the auxiliary instrument 1 of FIG. 1 is erected vertically. FIG. 7 is a diagram showing an image of radio wave sensitivity radiated when the metal rod 2 of the auxiliary instrument 1 of FIG. 1 is tilted obliquely. Incidentally, in the case of FIG. 6, the radio wave sensitivity T1 includes the radio wave sensitivity T3 along the metal rod 2 in FIG.

  As shown in FIG. 5, it is known that the sensitivity of the radio wave traveling in the vertical direction from the metal rod 2 is proportional to the reciprocal of the distance h1 in the traveling direction of the space, which is a feature of the radiated radio wave. That is, the sensitivity of the radiated radio waves over the booster unit 3 gradually decreases as the distance from the booster unit 3 increases. On the other hand, the sensitivity of electromagnetic waves (surface waves) flowing so as to reach the surface of the metal rod 2 is proportional to the reciprocal of the square of the distance h2 in the direction perpendicular to the direction in which the metal rod 2 extends, or is weak exponentially. It is known to be. In other words, the sensitivity of the surface wave of the metal rod 2 decreases rapidly as the distance from the metal rod 2 increases. Further, as for the sensitivity regarding the distance r along the electromagnetic wave transmitted in the length direction of the metal rod 2, standing waves that periodically increase and decrease in the length direction of the metal rod 2 are distributed. It is known that the distribution of this standing wave gradually weakens due to resistance loss on the surface of the metal rod 2. That is, as the resistance loss is smaller, the sensitivity is ensured with the length of the rail line distance r. Further, as shown in FIG. 6, the sensitivity of the radiated radio wave over the booster unit 3 when the auxiliary instrument 1 is vertical is included up to the position where the operator holds the metal rod 2 as shown in the radio wave sensitivity T1. Therefore, the IC tag can be detected without bringing the reader / writer 6 close to the manhole cover 7. Furthermore, as shown in FIG. 7, when the auxiliary instrument 1 is tilted obliquely, a radio wave sensitivity T2 extending to the sky above the booster unit 3 and a radio wave sensitivity T3 around the surface of the metal rod 2 are formed. Even in this case, the IC tag can be detected without bringing the reader / writer 6 close to the manhole cover 7. Incidentally, the standing wave known in electromagnetism corresponds to the radio wave sensitivity T3 in FIG.

  FIG. 8 is a diagram showing a method of detecting an IC tag when the manhole cover 7 is located under the vehicle 80 using the auxiliary instrument 1 of FIG. 1 by utilizing the radio wave sensitivity T3. As shown in FIG. 8, there may be a parked vehicle 80 above the manhole cover 7, and it may be very difficult to read / write information from / to the IC tag with the reader / writer 6 alone. is there. However, the metal rod 2 of the auxiliary device 1 is tilted sideways so that the booster unit 3 is slid under the vehicle 80 and superimposed on the manhole cover 7 so that the reader / writer 6 emits radio waves from the vicinity of the metal rod 2. Thus, it is possible to read and write information safely and easily with respect to the IC tag attached to the manhole cover 7.

  FIG. 9 is a diagram showing a method of detecting an IC tag from the manhole cover 7 through the guardrail 90 using the auxiliary instrument 1 of FIG. As shown in FIG. 9, the manhole cover 7 is located on the side of the roadway from the guard rail 90, and there is a case where it is forced to work in an environment where the traffic volume is very high. However, the metal rod 2 of the auxiliary device 1 is tilted sideways so that the booster unit 3 is slid under the guard rail 90 and is superimposed on the manhole cover 7 by utilizing the radio wave sensitivity T3 shown in FIG. By radiating radio waves from the vicinity of the metal rod 2, information can be read and written safely and easily even with respect to the IC tag attached to the manhole cover 7. In the case of the example shown in FIG. 9, if the booster unit 3 is overlaid on the manhole cover 7, the radio wave sensitivity T2 extending to the sky above the booster unit 3 as described in FIG. The reader / writer 6 may emit radio waves from above the lid 7 to read / write information.

  As described above, the auxiliary instrument 1 is used together with the reader / writer 6 that can read and write information with respect to the IC tag, and the metal rod 2 that can propagate the radiated radio wave from the reader / writer 6 ( An example of propagation means), a booster unit 3 (resonance promotion means) capable of promoting resonance in the polarization direction of the IC tag based on the electromagnetic wave propagated so as to crawl on the surface of the metal rod 2, and a booster Since it has a buffer member 11 (buffer means) that is integrated with the portion 3 and has a certain thickness, the electromagnetic wave propagated so as to crawl the surface of the metal rod 2 and the metal rod 2 of the booster portion 3. Electromagnetic coupling is established in the vicinity of the connecting portion, and electromagnetic waves propagate to the surface of the metal disc 12 constituting the booster unit 3. When the resonant polarization in the direction on the extension line of the metal rod 2 matches the resonant polarization direction of the IC tag, the best IC tag communication is established, and the reader / writer 6 reads / writes information from / to the IC tag. You will be able to Therefore, even if the output of the reader / writer 6 is set to be low, it is not necessary to detect one by one in a posture where the manhole cover 7 is crouched, and work efficiency is not impaired. In addition, when there is a passing vehicle in the vicinity while detecting information from the IC tag, the standing posture can be maintained, so that it can be immediately retreated together with the auxiliary device 2, and the operator's agility is not lost. . Further, since the reader / writer 6 is not attached to the tip of the metal rod 2, the operability of the reader / writer 6 is not impaired. That is, the auxiliary instrument 1 can read and write information safely and easily with respect to the IC tag using the reader / writer 6.

(Other embodiments)
As mentioned above, although the auxiliary instrument 1 was demonstrated with reference to FIGS. 1-9, the auxiliary instrument 1 can also devise further corresponding to the subject shown below.

  FIG. 10 is a diagram for explaining a problem caused by the relationship between the traveling direction of the surface wave propagating through the metal rod 2 and the polarization direction of the IC tag inside the manhole cover. As shown in FIG. 10, when the direction X1 of the radio wave traveling on the surface of the metal rod 2 matches the polarization direction X2 of the radio wave on the IC tag side, the sensitivity of the radio wave is maximized. However, when the relationship is orthogonal, such as the relationship between the direction X1 of the radio wave traveling on the surface of the metal rod 2 and the polarization direction X3 of the radio wave on the IC tag side, the lowest radio wave sensitivity or radio wave sensitivity is obtained. If it becomes extremely low, IC tag communication cannot be performed in some cases. That is, even in the use state shown in FIG. 8 and FIG. 9 described above, there are cases where reading and writing cannot be performed successfully with respect to the IC tag attached to the manhole cover 7.

  FIG. 11 is a diagram illustrating an example of a device for solving the problem illustrated in FIG. 10. As shown in FIG. 11, a device is installed that branches in two directions when the radio wave X <b> 1 transmitted through the metal rod 2 enters the disk-shaped booster unit 3. Specifically, a metal fitting 110 is installed such that the disk is bent at a right angle with a diameter of half wavelength, the semicircular portion is close to the metal rod 2, and the remaining semicircular portion overlaps the booster 3. In such a configuration, a polarized wave (A) indicated by a solid line arrow and a polarized wave (C) orthogonal thereto are generated from the radio wave transmitted through the metal rod 2. Since this polarization (C) is partially in the same direction as the polarization (B) of the IC tag, it is possible to prevent the sensitivity from becoming extremely low. That is, such a metal fitting 110 can be regarded as a high-frequency branch circuit for the surface radio wave X1.

  FIG. 12 is a diagram illustrating an example of a support structure incorporating the device of FIG. In FIG. 12, a device is devised for the junction hinge between the metal rod 2A and the booster portion 3A. The support structure shown in FIG. 12 is configured as a universal joint that can be adjusted between 0 to 180 degrees by sandwiching a metal rod 2A between two hinge parts 30a and 30b and tightening it with a screw 120 and a nut 121. ing. The hinge part 30a is an insulating part for attaching the metal bar 2A to the booster part 3A. The hinge part 30b is a hinge part for attaching the metal bar 2A to the booster part 3A, and has a role of a high-frequency circuit for electromagnetically coupling the surface wave propagating through the metal bar 2 and the metal part of the booster part 3A. is there. The hinge part 30b is a metal part having a radius of a quarter wavelength. In other words, the hinge part 30b serves both as a mechanical joining mechanism and a high-frequency circuit.

  FIG. 13 is a diagram illustrating an example of another support structure incorporating the device of FIG. 11. In the booster unit 3B shown in FIG. 13, a circularly polarized wave component can be generated by the quarter wavelength antenna 30C. That is, the quarter-wave antenna 30C functions as a high-frequency circuit for electromagnetically coupling the surface wave propagating through the metal rod 2 and the booster unit 3B. This is because when the metal rod 2A is tilted toward the quarter-wave antenna 30C, the IC tag directly below the booster unit 3B is in any direction by generating polarized waves in a direction orthogonal to the direction in which the metal rod 2A extends. Even so, communication with the IC tag becomes possible.

  14 and 15 are diagrams showing an example of another support structure incorporating the device of FIG. In the booster unit 3C shown in FIG. 14, a branch is made by the stripline 30d. As shown in FIG. 14B, the strip line 30d forms a strip-shaped conductor foil on the surface of the booster portion 3C in the form in which the surface of the circular metal portion 12 is covered with the surface layer portion 5a which is an insulating dielectric. It has the structure (strip line). The strip line 30d is preferably adjusted so as to resonate such that the entire length along the path of the conductor foil is a half wavelength. The strip line 30d functions as a transmission path for transmitting the electromagnetic waves h3 and h5 propagated along the metal rod 2. In the portion where the metal rod 2, the disc-shaped booster portion 3 </ b> C, and the strip line 30 d overlap each other, they are electromagnetically coupled to each other. In this configuration, when the radio waves traveling from the metal rod 2 toward the disc-shaped booster portion 3C pass through the overlapping portions, they can be branched in two perpendicular directions. As shown in FIGS. 14 and 15, the metal rod 2 </ b> A has two degrees of freedom as a high-frequency circuit because it has 0 to 180 degrees of freedom of bending. With these high-frequency circuits, one of the linearly polarized wave direction h3 or the linearly polarized wave direction h5 coincides with the extending direction in the state of the metal rod 2A1 shown in FIG. 14A or the state of the metal rod 2A2 in FIG. One of them can be branched into a linearly polarized wave direction h4 or a linearly polarized wave direction h6 in a direction perpendicular to the state of the metal rods 2A1 and 2A2. When the metal rod 2A is at a 90 degree position (that is, in an upright state), the booster unit 3C is vertically polarized with the circularly polarized wave directly from the reader / writer 6 or the auxiliary device 1 as shown in FIG. Due to the radio wave sensitivity T1 of the radiated radio wave in the sky, information can be read from and written to the IC tag even if this high frequency circuit does not function.

  FIG. 16 is an appearance of an auxiliary instrument 1A according to another embodiment of the present invention. 16 is different from the auxiliary instrument 1 of FIG. 1 in that a reader / writer 6 is directly attached to the metal rod 2 and integrated. Information read by the reader / writer 6 is transferred to the information display terminal 160 via a communication unit (not shown). Then, on the display (not shown) of the information display terminal 160, the read information or information on the manhole cover 7 associated with the read information is displayed. Even with such an auxiliary device 1A, the IC tag can be operated in a standing posture using the reader / writer 6, and information can be read and written safely and easily.

  FIG. 17 is a diagram showing a booster unit 3D different from the booster unit 3 of FIG. The booster unit 3D is composed of a rectangular plastic layer, a rectangular metal layer, and a partial buffer member. Although it is necessary to match the rectangular longitudinal direction (polarization direction) with the polarization direction of the IC tag, the auxiliary device 1B having such a booster unit 3D is safe and safe because the standing posture can be operated. It is also possible to read and write information easily.

  The booster portions 3, 3A, 3B, 3C, and 3D have a structure in which the plastic surface layer portions 5 and 5a sandwich the metal portion 12. However, the surface layer portions 5 and 5a are provided only on the side where the joint portion 4 is provided. The buffer member 5 may be directly attached to the metal portion 12 on the side opposite to the portion 4.

  DESCRIPTION OF SYMBOLS 1,1A ... Auxiliary instrument, 2 ... Metal rod (an example of propagation means), 3, 3A, 3B, 3C ... Booster part (an example of resonance facilitating means), 4 ... Joint part, 5 ... Buffer member, 6 ... Reader / Writer, 7 ... Manhole cover

Claims (4)

An auxiliary device used with a reader / writer that can read and write information to an IC tag,
And propagation means capable of propagating electric waves from the reader / writer,
Wherein based on the radio wave that has been propagated by the propagation means, a resonance conducive means capable of promoting the resonant polarization direction of the IC tag,
A buffer means integrated with the resonance facilitating means and having a certain thickness;
Joining means for joining the propagation means and the resonance facilitating means ;
The joining means has a support structure capable of changing a joining angle between the propagation means and the resonance facilitating means,
The support device has a structure that functions as a high-frequency branch circuit that branches the radio wave propagated by the propagation means in two directions . The auxiliary device according to claim 1,
As the high-frequency branch circuit, a strip line is formed on the surface of the resonance facilitating means. The auxiliary device according to claim 1,
As the high-frequency branch circuit, a quarter-wave antenna is formed on the surface of the resonance facilitating means. The auxiliary device according to any one of claims 1 to 3 ,
The auxiliary instrument is characterized in that the resonance facilitating means has a substantially disc shape.