JP2008234527A - Rfid gate structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide RFID gate structure capable of preventing emission of excess radiowave to the outside of a predetermined area. <P>SOLUTION: RFID antennas 8 which read information stored in an RFID tag 7 are arranged, respectively on both sides of a path section 13 through which an identified object 10 to which the RFID tag 7 is attached passes. Radiowave absorbing side walls 1 are arranged on the opposite sides of the respective RFID antennas 8 across the path section 13. The respective radiowave absorbing side walls 1 are formed by sequentially connecting a plurality of vertically slender rectangle plates 19 by a connection tool 11 to be folded and developed on their vetical edges and the whole is openable and closable between a folded state and a developed state. In addition, leak detection IC tags 9, 9 for confirming that radiowave emitted from the RFID antenna 8 is equal to or less than a predetermined leak allowed value are attached to a front vertical edge 17/a rear vertical edge 18 of the radiowave absorbing side walls 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an RFID gate structure.

In recent years, a system (RFID) that stores information in a tag embedded with an IC chip of about several centimeters and reads information in a non-contact manner via electromagnetic waves or electromagnetic fields has been used as a next-generation identification technology that replaces barcodes. 2. Description of the Related Art Conventionally, an IC tag reader for reading is known (see, for example, Patent Documents 1 and 2). And it is expected to be applied in various fields such as goods traceability management in logistics, library collection management in libraries, and so on.
JP 2005-267077 A JP 2006-20083 A

The conventional UHF band (800 MHz to 960 MHz) IC tag reader is one of the great advantages that it can secure a large communication distance, but on the other hand, because the communication area is wide, it exists in places where reading is not desired There is a problem that even the information of the IC tag to be read is read.
Therefore, when the IC tag reader (gate) is provided with a pair of antennas facing each other, a radio wave absorber is installed on the back of each antenna to adjust the radio wave environment and to create a reflection interference point (Null point). There is a way to eliminate it, but if the radiation angle of the radio wave is too large, even the tag outside the gate may be read.

  Therefore, an object of the present invention is to provide an RFID gate structure that reliably prevents reading of an undesired IC tag outside the gate.

  In order to achieve the above object, in the RFID gate structure according to the present invention, an RFID antenna that reads information stored in the RFID tag is disposed on one side of a passage portion through which an identification target attached with the RFID tag passes. In addition, a radio wave absorbing side wall is disposed on the other side across the passage portion, and the radio wave absorbing side wall is connected to a plurality of vertically elongated rectangular plates in order so that they can be folded and unfolded at their vertical edge. The radio wave radiated from the RFID antenna is predetermined on the front vertical edge portion and the rear vertical edge portion of the radio wave absorption side wall. The leakage detection IC tag is attached to confirm that the leakage is less than the allowable value.

  The RFID gate structure according to the present invention includes an RFID antenna that reads information stored in the RFID tag on both sides of a passage portion through which an identification target provided with an RFID tag passes, and the passage. A radio wave absorption side wall is disposed on the opposite side of each RFID antenna across the section, and each radio wave absorption side wall is connected sequentially so that a plurality of vertically elongated rectangular plates can be folded and unfolded at the vertical edge thereof. The radio wave radiated from the RFID antenna is predetermined on the front vertical edge portion and the rear vertical edge portion of the radio wave absorption side wall. A leak detection IC tag for confirming that the value is equal to or less than the allowable leakage value is attached.

  The leak detection IC tag is detachably attached to the vertical edge portion of the radio wave absorption side wall. In addition, a wheel (moving wheel) is attached to the lower edge of the radio wave absorption side wall.

The present invention has the following remarkable effects.
The RFID gate structure according to the present invention determines whether or not the radio wave radiated from the antenna is sufficiently shielded by the radio wave absorption side wall, that is, whether or not it has leaked (emitted) outward from the edge. Thus, it is possible to easily and surely confirm, and it is possible to prevent reading of tag information in a place where reading is not desired. And when the leak of an electromagnetic wave is confirmed, it can respond easily by changing the expansion | deployment state of a side wall.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
1 and 2 show an embodiment of an RFID gate structure according to the present invention. This RFID gate structure is arranged on one side of a passage portion 13 through which an identification target 10 provided with an RFID tag 7 passes. An RFID antenna 8 for UHF band (800 MHz to 960 MHz) for reading information stored in 7 is provided. The RFID antenna 8 has a predetermined height (for example, 1300 mm) from the floor so that the radio wave radiation surface 28 is parallel to the direction of the passage portion 13 (passage direction 12 of the identification object 10) in plan view. It is hold | maintained by the holding member not shown so that it may become.

  As described above, the RFID antenna 8 is for UHF band R / W that transmits and receives radio waves, and has a characteristic that it can propagate farther than conventional RFID systems (13.56 MHz band, 2.45 GHz band, etc.) A longer distance can be secured. An example of the RFID antenna 8 will be described. It has a rectangular plate-shaped housing having a long side of 700 mm to 730 mm, a short side of 300 mm to 330 mm, and a thickness of 35 mm to 45 mm, and an aluminum case and a vinyl chloride cover. Further, the feeding point is located slightly below the center point of the circular radio wave radiation range.

In addition, the RFID gate structure of the present invention includes a radio wave absorption side wall 1 provided on the other side of the RFID antenna 8 with the passage portion 13 interposed therebetween. The electromagnetic wave absorbing side wall 1 is formed by connecting a plurality of vertically elongated rectangular plates 19 with a connecting tool 11 in order to be foldable and unfoldable at the longitudinal edge thereof, and can be opened and closed between the folded state and the unfolded state as a whole. It is formed. 1 and 2 has three rectangular plates 19..., A rectangular plate 19a provided in the center, and hinges and the like connected to the front and rear vertical edges 29 and 29 of the central rectangular plate 19a. Folding rectangular plates 19b and 19b connected to each other by means of tools 11. Further, wheels 25 are attached to the lower edge portion 24 of each rectangular plate 19. The radio wave absorption side wall 1 is erected on the floor surface so that the central rectangular plate 19a faces the radio wave radiation surface 28 of the RFID antenna 8 in parallel. Each rectangular plate 19 is formed by sequentially laminating, for example, polycarbonate, an adhesive material, an Ag film, PET, a gap (having a member), PET, an ITO film, an adhesive material, and polycarbonate.
In the present invention, the inlet side to be sent when the identification object 10 is sent in the passage direction indicated by the arrow 12 is the front side.

  Further, the radio wave absorption side wall 1 folds the rectangular plates 19b and 19b compactly with respect to the central rectangular plate 19a by forming the horizontally long dimension of the central rectangular plate 19a at least twice that of each folded rectangular plate 19b. (See FIG. 3). Further, the wheel 25 allows the folded rectangular plate 19b to be folded and unfolded smoothly with respect to the central rectangular plate 19a, and the movement of the side wall 1 as a whole is also performed smoothly.

Θ is the radiation angle in plan view of the beam 6 from which the tag information can be read out of the radio waves radiated from the RFID antenna 8. For example, the radiation angle θ is set to be a half-value angle. The half-value angle is an angle formed at a point where the power is half the value (a value obtained by subtracting 3 dB from the maximum power) with respect to the point where the radio wave is emitted most strongly, and represents the sharpness of the beam.
The beam 6 shown in FIG. 2 is radiated from the radio wave radiation surface 28 of the antenna 8 at an equal angle in the front-rear direction. However, due to the radiation characteristics of the antenna, the beam 6 is from the normal to the radio wave radiation surface 28. However, it may tilt slightly forward or rearward.

  Furthermore, in FIG. 1 to FIG. 5A, it is confirmed that the radio wave radiated from the RFID antenna 8 is below a predetermined leakage allowable value at the front vertical edge 17 and the rear vertical edge 18 of the radio wave absorption side wall 1. Leak detection IC tags 9 are provided for this purpose. The IC tag 9 has an elongated rectangular parallelepiped shape and is detachably attached to the front vertical edge 17 of the front folded rectangular plate 19b and the rear vertical edge 18 of the rear folded rectangular plate 19b. The Specifically, reference numeral 21 denotes a bag-like tag holder in which the IC tag 9 can be taken in and out. The planar fastener 22 formed outside the tag holder 21 and the front vertical edge of the front / rear folding rectangular plate 19b. The tag holder 21 is detachably attached to the rectangular plate 19b by the portion 17 and the planar fasteners 20 and 20 formed on the rear vertical edge portion 18.

Then, the IC tag 9 is enclosed in the tag holder 21 and attached to the front vertical edge 17 and the rear vertical edge 18 of the rectangular plate 19b. Since it is detachable, the upper and lower attachment positions can be freely changed according to the installation height of the antenna 8, the size of the radiated radio wave, the radiation angle, etc. (see FIG. 4).
Further, the attachment state of the IC tag 9 can be changed to a vertically long shape (see FIG. 4) or a horizontally long shape (see FIG. 6) in accordance with the polarization plane of the radio wave radiated from the antenna 8. One or a plurality of IC tags 9 are attached to the front vertical edge 17 and the rear vertical edge 18 of the rectangular plates 19b and 19b, respectively. 5B, the IC tag 9 is attached to another surface in the vicinity of the front vertical edge 17 and the rear vertical edge 18 so that the position can be changed. Is also free. Further, as shown in FIG. 6, it may be attached in a slanted manner (variable angle) with a desired angle β.
The tag holder 21 may be omitted, and the planar fastener 22 may be formed on the IC tag 9 itself so that it can be directly attached to and detached from the radio wave absorption side wall 1. Further, instead of the planar fasteners 20 and 22, the IC tag 9 may be attached to the radio wave absorption side wall 1 with a double-sided tape.

  FIG. 7 is a plan view of a principal part for explanation showing the relationship between the radio wave absorption side wall 1 and the beam 6. When the front folding rectangular plate 19b is in the state indicated by X, the front end edge portion 17 and the leak detection IC tag 9 are within the range of the beam 6, and the beam 6 exceeds the radio wave absorption side wall 1 ( It leaks to the opposite side of the antenna 8 across the passage 13. Then, since the RFID antenna 8 reads the IC tag 9, it is possible to confirm leakage of radio waves (beyond the radio wave absorption sidewall 1).

  As described above, when the leakage of radio waves is confirmed, the folded rectangular plate 19b is further developed from the X state so that the front edge 17 and the IC tag 9 protrude from the range of the beam 6 (indicated by Y). The beam 6 is prevented from leaking from the radio wave absorption side wall 1. That is, the rectangular plate 19b may be developed until the beam 6 does not read the IC tag 9. Although not shown in the drawings, the description of the rectangular plate 19b on the rear side of the radio wave absorption side wall 1 is the same as that described above for the folded rectangular plate 19b on the front side.

  Here, the assembly procedure of the gate structure of FIGS. 1 and 2 will be described. When transporting to the installation location, the radio wave absorption side wall 1 is in a state where the two folded rectangular plates 19b, 19b are in a compact folded state (solid line state in FIG. 3) with respect to the central rectangular plate 19a. Is smooth. At the installation location, the RFID antenna 8 and the central rectangular plate 19a of the radio wave absorption side wall 1 are arranged so as to face each other in parallel with the passage portion 13 therebetween. Then, as described above, the folded rectangular plates 19b and 19b are adjusted by being expanded to a predetermined angle so that the radiated radio waves do not leak from the radio wave absorption sidewall 1, and are not moved unexpectedly by a fixing member (not shown). Then, the set is complete.

  Next, FIGS. 8 and 9 show another embodiment of the RFID gate structure according to the present invention. The difference from the gate structure of FIGS. 1 and 2 is that the RFID antenna 8 is provided on both sides of the passage portion 13, respectively. And the radio wave absorption side wall 1 is disposed on the opposite side of each RFID antenna 8 with the passage portion 13 interposed therebetween. The RFID antennas 8A and 8B on one side and the other side of the central rectangular plate 19a on the side wall 1 have the same height position or different height positions so that the radio wave emission surfaces 28 and 28 are parallel and opposed to each other. The RFID antenna 8 is fixed to the surface (surface on the side of the passage portion 13). Further, the radio wave absorption side walls 1A and 1B on one side and the other side are erected with their respective central rectangular plates 19a and 19a facing each other in parallel. The arrangement of each radio wave absorption side wall 1 and the RFID antenna 8 facing the side wall, the installation height of the antenna 8, and the configuration in which the IC tag 9 is attached to each side wall 1 are the same as those described with reference to FIGS. is there.

Further, the upper ends of the front end edge portions 17 and 17 and the upper ends of the rear end edge portions 18 and 18 of the pair of radio wave absorbing side walls 1A and 1B are detachably connected by the connecting rod 14, respectively. The connecting rod 14 can be omitted.
8 and 9, the assembly procedure of the gate structure in FIG. 8 and FIG. 9 is such that a pair of RFID antennas 8A and 8B and a pair of radio wave absorption side walls 1A and 1B are disposed opposite to each other with the passage portion 13 in between. The assembly is complete when the gate structure is assembled in the same procedure as that of the gate structure shown in FIGS. After that, it is desirable that the pair of radio wave absorption side walls 1A and 1B are connected by connecting rods 14 and 14 because they can be stably held. That is, the connecting rod 14 prevents position fluctuations of the pair of side walls 1A and 1B and unexpected swinging of the folded rectangular plate 19b.

  Then, the RFID antenna 8A on one side and the RFID antenna 8B on the other side perform transmission / reception alternately by shifting the time zone. Therefore, for example, even if the RFID tag 7 is attached to one side or the other side of the large identification target 10, either RFID antenna 8 can read the tag information. Further, even when a large number of identification objects 10 attached with RFID tags 7 are stacked on a cart, all RFID tags 7 are not leaked, and one of the RFID antennas 8 reads reliably.

  1, 2, 8, and 9 are formed by connecting three rectangular plates 19 so that they can be folded and unfolded. However, the design change is not limited to this. Even if it is formed by connecting two rectangular plates 19 and 19 so as to be foldable, or formed by connecting four or more rectangular plates 19 so as to be foldable. Good (not shown). Even when four or more rectangular plates 19 are connected to each other, the IC tag 9 includes the front vertical edge 17 of the frontmost rectangular plate 19 and the rear vertical edge 18 of the rearmost rectangular plate 19. Removably attached to. In addition, when it is set as the structure which can expand | deploy to flat form by making the expansion | deployment angle of the electromagnetic wave absorption side wall 1 into a maximum of 180 degrees, the standing support member (illustration omitted) of some inversion prevention is required. On the other hand, in the case of the structure in which the angle shown in FIGS. 2 and 9 is in the maximum deployed state, it can stand by itself, and the standing support member can be omitted.

  Although not shown, the RFID antenna 8 may be installed above or below the passage portion 13, and a gate structure in which a pair of side walls 1 and 1 are connected by connecting rods 14 and 14 as shown in FIGS. In this case, by providing the leakage detection IC tag 9 in each connecting rod 14, it becomes possible to confirm the leakage of the radio wave radiated from the antenna 8.

  As described above, in the RFID gate structure according to the present invention, the RFID antenna 8 that reads the information stored in the RFID tag 7 is arranged on one side of the passage portion 13 through which the identification target 10 provided with the RFID tag 7 passes. The radio wave absorption side wall 1 is disposed on the other side with the passage portion 13 interposed therebetween, and the radio wave absorption side wall 1 can be folded and unfolded with a plurality of vertically elongated rectangular plates 19 at the vertical edge thereof. They are sequentially connected by a connecting tool 11 so that the whole can be opened and closed between the folded state and the unfolded state. Further, the front vertical edge portion 17 and the rear vertical edge portion 18 of the radio wave absorption side wall 1 are connected to the RFID antenna 8. Since the leak detection IC tags 9 and 9 for confirming that the radiated radio wave is less than or equal to the predetermined leakage allowable value are attached, the radio wave that reads the tag information radiated from the antenna 8 is absorbed by the radio wave. From the side wall 1 (to the antenna 8 across the passage 13) You can check if there is any leak. Therefore, reading of tag information in a place where reading is not desired can be reliably prevented. Since the entire radio wave absorption side wall 1 is formed to be openable and closable between the folded state and the unfolded state, when the leakage of the radio wave is confirmed by the IC tag 9, the unfolded state of the side wall 1 is changed. Thus, adjustment can be made so that radio waves do not leak.

Further, the RFID gate structure according to the present invention is provided with an RFID antenna 8 for reading information stored in the RFID tag 7 on both sides of the passage portion 13 through which the identification object 10 provided with the RFID tag 7 passes, In addition, a radio wave absorption side wall 1 is disposed on the opposite side of each RFID antenna 8 across the passage portion 13, and each radio wave absorption side wall 1 folds a plurality of vertically long rectangular plates 19 at its vertical edge. It is connected with a connecting tool 11 so that it can be deployed, and the whole is formed to be openable and closable between the folded state and the unfolded state. Further, the front vertical edge 17 and the rear vertical edge 18 of the radio wave absorption sidewall 1 Since the leak detection IC tags 9 and 9 for confirming that the radio wave in plan view radiated from the antenna 8 is less than or equal to a predetermined leak tolerance value, the radio wave that reads tag information radiated from the antenna 8 is provided. From the electromagnetic wave absorption side wall 1 (a It is possible to check whether leaking to the opposite side (to the antenna 8). Therefore, reading of tag information in a place where reading is not desired can be reliably prevented. Since the entire radio wave absorption side wall 1 is formed to be openable and closable between the folded state and the unfolded state, when the leakage of the radio wave is confirmed by the IC tag 9, the unfolded state of the side wall 1 is changed. Thus, adjustment can be made so that radio waves do not leak.
Further, by alternately transmitting and receiving the RFID antenna 8A on one side and the RFID antenna 8B on the other side while shifting the time zone, for example, the RFID tag 7 is attached to one side or the other side of the large identification target 10 in a biased manner. Even if it is done, either RFID antenna 8 can read reliably. Further, even when a large number of identification objects 10 attached with RFID tags 7 are stacked on the carriage, any one of the RFID antennas 8 can reliably read all the RFID tags 7 without leakage. Further, the RFID antenna 8 is technically rational because the directivity is increased without increasing the antenna gain.

  In addition, since the leak detection IC tag 9 is detachably attached to the vertical edges 17 and 18 of the radio wave absorption side wall 1, the installation height of the RFID antenna 8 and the radiation angle θ of the radiated radio wave are adjusted. Accordingly, the upper and lower attachment positions of the IC tag 9 can be freely changed, and the presence or absence of radio wave leakage (being a predetermined leakage allowable value or less) can be reliably confirmed. In addition, when using a long and narrow IC tag 9, the attachment state of the IC tag 9 can be changed in various ways such as horizontally or vertically according to the polarization plane of the radiated radio wave. Is even more certain.

  Further, since the wheel 25 is attached to the lower edge portion 24 of the radio wave absorption side wall 1, the side wall 1 can be smoothly swung between the folded state and the unfolded state. Therefore, it is possible to increase the work efficiency when the side wall 1 is opened and closed to adjust so that radio waves do not leak from the side wall 1 or when the side wall 1 is moved and assembled.

1 is a perspective view showing an embodiment of an RFID gate structure according to the present invention. It is a top view. It is a top view which shows an electromagnetic wave absorption side wall. It is a principal part perspective view. It is an AA expanded sectional view of FIG. It is a principal part perspective view. It is a principal part top view for description. It is a perspective view which shows other embodiment of the RFID gate structure based on this invention. It is a top view.

Explanation of symbols

1 Radio wave absorption side wall 7 RFID tag 8 RFID antenna 9 Leak detection IC tag
10 Identification object
11 Connector
13 Passage
17 Front vertical edge
18 Rear vertical edge
19 Rectangular plate
24 Lower edge
25 wheels

Claims (4)

An RFID antenna (8) for reading information stored in the RFID tag (7) is disposed on one side of the passage (13) through which the identification target (10) provided with the RFID tag (7) passes, In addition, a radio wave absorption side wall (1) is disposed on the other side across the passage portion (13),
The electromagnetic wave absorption side wall (1) is connected to a plurality of vertically elongated rectangular plates (19) at their vertical end edges so that they can be folded and unfolded sequentially with a connecting tool (11). The radio wave radiated from the RFID antenna (8) is formed on the front vertical edge (17) and the rear vertical edge (18) of the radio wave absorption side wall (1). An RFID gate structure comprising a leakage detection IC tag (9) (9) for confirming that the leakage allowable value is not more than RFID antennas (8) for reading information stored in the RFID tag (7) are disposed on both sides of the passage (13) through which the identification target (10) provided with the RFID tag (7) passes, In addition, a radio wave absorption sidewall (1) is disposed on the opposite side of each RFID antenna (8) across the passage portion (13),
Each of the electromagnetic wave absorption side walls (1) is connected to a plurality of vertically elongated rectangular plates (19) by means of a connecting tool (11) so that they can be folded and unfolded at their vertical edges. The radio wave radiated from the RFID antenna (8) is formed to be openable and closable between the unfolded state, and further to the front vertical edge (17) and the rear vertical edge (18) of the radio wave absorption side wall (1). An RFID gate structure comprising a leak detection IC tag (9) (9) for confirming that the value is equal to or less than a predetermined leak allowable value.   The RFID gate structure according to claim 1 or 2, wherein the leak detection IC tag (9) is detachably attached to the vertical edge portions (17), (18) of the radio wave absorption side wall (1).   The RFID gate structure according to claim 1, 2, or 3, wherein a wheel (25) is attached to a lower edge (24) of the radio wave absorption side wall (1).

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