WO2010079536A1 - Reader/writer - Google Patents
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- Publication number
- WO2010079536A1 WO2010079536A1 PCT/JP2009/000973 JP2009000973W WO2010079536A1 WO 2010079536 A1 WO2010079536 A1 WO 2010079536A1 JP 2009000973 W JP2009000973 W JP 2009000973W WO 2010079536 A1 WO2010079536 A1 WO 2010079536A1
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- WO
- WIPO (PCT)
- Prior art keywords
- antenna
- reader
- reception level
- writer
- radio wave
- Prior art date
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- 230000006854 communication Effects 0.000 claims abstract description 57
- 238000004891 communication Methods 0.000 claims abstract description 57
- 238000001514 detection method Methods 0.000 claims description 18
- 230000002159 abnormal effect Effects 0.000 abstract description 20
- 238000010586 diagram Methods 0.000 description 19
- 238000000034 method Methods 0.000 description 4
- 239000000470 constituent Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000005404 monopole Effects 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000007175 bidirectional communication Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/40—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by components specially adapted for near-field transmission
- H04B5/48—Transceivers
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
Definitions
- the present invention relates to a reader / writer that performs wireless communication with a wireless tag or the like.
- Patent Document 1 discloses that bidirectional communication is performed when a wireless tag comes at a distance close to a reader / writer.
- the reader / writer receives the radio wave transmitted from the wireless tag and detects the reception level. When the detected reception level exceeds a certain value, it is determined that the wireless tag is within a predetermined range, and communication is performed. This communication is called normal communication.
- the reception level reaches a certain value or more even if the distance from the reader / writer is large.
- the reader / writer erroneously determines that the wireless tag is within the predetermined range and performs communication. Such a state is called abnormal communication.
- the present invention provides a reader / writer that can prevent erroneously determining that a person is in a short distance even if a strong radio wave transmitted from a long distance away from a predetermined distance is received. .
- the present invention receives a first antenna that receives a radio wave transmitted from a radio wave transmitter, a second antenna that receives a radio wave transmitted from the radio wave transmitter, and the first antenna or the second antenna.
- a reception level detection unit that detects a reception level of radio waves. Further, based on the level difference between the reception level value of the radio wave received by the first antenna detected by the reception level detection unit and the reception level value of the radio wave received by the second antenna detected by the reception level detection unit. And a determination unit that determines whether the communication is normal. Further, the first and second antennas are arranged such that the first distance between the radio wave transmitter and the first antenna is shorter than the second distance between the radio wave transmitter and the second antenna. .
- FIG. 1 is a block diagram showing a configuration of a reader / writer according to Embodiment 1 of the present invention.
- FIG. 2 is a flowchart showing the operation of the reader / writer of the embodiment.
- FIG. 3 is a diagram illustrating the relationship of the received electric field strength with respect to the distance between the reader / writer and the wireless tag according to the embodiment.
- FIG. 4 is a schematic diagram illustrating a form of abnormal communication.
- FIG. 5 is a block diagram showing the configuration of the reader / writer according to Embodiment 2 of the present invention.
- FIG. 6 is a block diagram showing the configuration of the reader / writer according to the third embodiment of the present invention.
- FIG. 7 is a configuration diagram showing the loop antenna of the same embodiment.
- FIG. 1 is a block diagram showing a configuration of a reader / writer according to Embodiment 1 of the present invention.
- FIG. 2 is a flowchart showing the operation of the reader / writer of the embodiment.
- FIG. 3
- FIG. 8 is a diagram illustrating the relationship of the received electric field strength with respect to the distance between the reader / writer and the wireless tag according to the embodiment.
- FIG. 9 is a block diagram showing the configuration of the reader / writer according to Embodiment 4 of the present invention.
- FIG. 10 is a configuration diagram illustrating a usage state of the reader / writer according to the fifth embodiment of the present invention.
- FIG. 11 is a block diagram showing the configuration of the reader / writer in the same embodiment.
- FIG. 12 is a flowchart showing the operation of the embodiment.
- FIG. 13 is a block diagram showing the configuration of the reader / writer according to Embodiment 6 of the present invention.
- FIG. 1 is a block diagram showing a configuration of a reader / writer according to Embodiment 1 of the present invention.
- a reader / writer 10 incorporates first and second antennas 1 and 2 and a receiving unit 3 in a reader / writer housing 6 as a main body.
- a transmission unit, a power supply unit, an external wired communication unit, and the like are also provided.
- the first antenna 1 is attached relatively close to the reading surface 7 of the reader / writer housing 6.
- the reading surface 7 is one surface of the reader / writer housing 6 and is a surface on which the wireless tag 8 as a radio wave transmitter is brought close.
- the reader / writer 10 determines that the wireless tag 8 is present, and communication is started by both.
- the wireless tag 8 There are various shapes of the wireless tag 8, but in this embodiment, the mobile phone has a built-in wireless tag function. However, various shapes such as a card type may be used.
- the first antenna 1 is connected to a reception level detection unit 4 constituting the reception unit 3 and detects the level of the received radio wave.
- the reception level detection unit 4 uses an RSSI (Received Signal Signal Strength) circuit.
- a second antenna 2 is provided separately from the first antenna 1.
- the second antenna 2 is attached at a position farther from the reading surface 7 than the first antenna 1. When the distance between the first antenna 1 and the reading surface 7 is A1, and the distance between the second antenna 2 and the reading surface 7 is A2, the relationship of A1 ⁇ A2 is established.
- the second antenna 2 is also connected to the reception level detector 4, and the reception level detector 4 detects the level of the received radio wave.
- a determination unit 5 is connected to the reception level detection unit 4.
- the determination unit 5 determines whether or not the communication is abnormal based on the first antenna 1 received radio wave level (B1) and the second antenna 2 received radio wave level (B2) detected by the reception level detection unit 4. judge. That is, the determination unit 5 determines whether the distance between the wireless tag 8 and the reader / writer 10 is within 5 cm (that is, whether the radio wave is from a long distance).
- FIG. 2 is a flowchart showing the operation of the reader / writer 10 of the present embodiment.
- the determination operation of the determination unit 5 will be described with reference to FIG. From the start of operation (S201), the reception level of the first antenna 1 is first monitored, and the reception level B1 of the first antenna 1 is measured by the reception level detector 4 (S202). Next, the determination unit 5 determines whether the reception level B1 is greater than a predetermined reception level B0 (here, set to a reception level received at a distance of 5 cm), that is, B1> B0 (S203). If it is determined in step S203 that B1> B0 (Yes in S203), the reception level detection unit 4 measures the reception level B2 of the second antenna 2 (S204).
- a predetermined reception level B0 here, set to a reception level received at a distance of 5 cm
- FIG. 3 shows the relationship between the reception level of radio waves received by the antenna of the reader / writer 10 and the distance between the reader / writer 10 and the wireless tag 8.
- the relationship between the strength of the reception level received by the antenna with respect to the distance between the reader / writer 10 and the wireless tag 8 during normal communication is indicated by a line 301, and the relationship between the reader / writer 10 and the wireless tag 8 during abnormal communication is shown.
- the relationship between the strength of the reception level received by the antenna with respect to the distance between them is shown by a line 302.
- the reception level P (mW) has a relationship of P ⁇ 1 / (L 2 ) with respect to the distance L (m). That is, the reception level P attenuates in inverse proportion to the square of the distance.
- the distance between the first antenna 1 and the wireless tag 8 is 1 cm
- the distance between the second antenna 2 and the wireless tag 8 is 5 cm (that is, the distance between the first and second antennas is 4 cm).
- the difference D1 14 dB between the reception level B1 of the first antenna 1 and the reception level B2 of the second antenna 2.
- the determination threshold value D0 of the D value in the determination unit 5 is set to a value (for example, 8 dB) between 14 dB and 0.34 dB.
- the measured D value is larger than the threshold value D0, it can be determined that the communication is normal (that is, the wireless tag 8 is in the vicinity of the reader / writer 10), and data communication is started.
- it is smaller than D0 it is determined that the communication is abnormal and the communication is stopped.
- FIG. 4 is a schematic diagram for explaining the form of abnormal communication.
- the malicious third party owns the wireless tag device 46 installed at a long distance 45 from the reader / writer 10, and outputs a strong radio wave 48 from the directional antenna 47 of the wireless tag device 46.
- the radio wave 48 radiated at a stronger level than the far field cannot be identified as the radio wave from the far field.
- the first antenna 1 receives the radio wave at the reception level B1 by making a determination as described above using the difference from the reception level of the second antenna 2 as in the present embodiment, It is possible to determine whether the radio wave is from a distance.
- the radio wave transmitter is described as the radio tag 8, but the same effect can be obtained as long as the radio tag 8 has a function of transmitting radio waves, such as a barcode or an IC card.
- FIG. 5 is a block diagram showing a configuration of the reader / writer 10 according to Embodiment 2 of the present invention.
- the reader / writer 10 of this embodiment has only one antenna 31, and an antenna for moving the antenna 31 in a direction away from (or toward) the reading surface 7 of the reader / writer housing 6.
- the point which has the variable part 32 differs from Embodiment 1.
- FIG. For example, a motor, an electromagnetic coil, or the like is used as the antenna variable section 32, and these can be driven to move the antenna 31 up and down. Note that the same constituent elements as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.
- the reception level B1 is first measured with the antenna 31 close to the reading surface 7, the antenna 31 is moved by the antenna variable unit 32, and the antenna 31 is separated from the reading surface 7.
- This embodiment has an advantage that the apparatus can be simplified because it can be configured with one antenna. In addition, since the two reception levels are measured with the same antenna, it is possible to avoid deterioration in measurement accuracy due to a difference in antenna gain.
- FIG. 6 is a block diagram showing the configuration of the reader / writer 10 according to Embodiment 3 of the present invention.
- the reader / writer 10 of the present embodiment uses the first and second loop antennas 11 and 12 in place of the first and second antennas 1 and 2 in the first embodiment. This is different from the first embodiment. Note that the same constituent elements as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.
- FIG. 7 is a block diagram showing a loop antenna.
- a balun 72 that performs unbalanced-balanced conversion is provided on the printed circuit board 71, and balanced output terminals of the balun 72 are connected to both ends of the loop element 73.
- the loop element 73 is configured by bending a copper wire, and is arranged in a direction in which the axis of the loop is parallel to the printed circuit board 71.
- a connection connector 74 for connecting to the receiving unit 3 is connected to the unbalanced output terminal of the balun 72.
- Such a loop antenna has a loop element length sufficiently smaller than the wavelength of the used radio wave (less than a fraction of the wavelength) and is generally called a micro loop antenna.
- a micro loop antenna is a kind of a magnetic current antenna, and has a characteristic that a gain fluctuation when a metal body is close is small as compared with a current antenna (monopole antenna or the like).
- FIG. 8 shows an example of the relationship between the received electric field level and the distance between the reader / writer 10 and the wireless tag. As described above, in the free space, the relationship is the reception level P ⁇ 1 / (L 2 ). However, when the antennas are brought close to each other by a distance of a fraction of the wavelength of the radio wave, the phenomenon that the antenna gain decreases. It can be seen.
- FIG. 8 shows a case where the wavelength is 70 cm. As shown by a line 801, in the monopole antenna, a decrease in antenna gain is observed in a region closer to 4 cm. On the other hand, as shown by the line 802, no gain reduction is observed in the loop antenna.
- the reception level when the wireless tag is brought close to the reader / writer 10 can be accurately measured.
- radio waves radiated from a distance, that is, abnormal communication can be more reliably determined.
- FIG. 9 is a block diagram showing the configuration of the reader / writer 10 according to Embodiment 4 of the present invention.
- the first and second diversity antennas 41 and 42 are used in place of the first and second antennas 1 and 2 in the first embodiment. Different from 1. Note that the same constituent elements as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.
- two loop antennas 41a, 41b and 42a, 42b are arranged in directions in which the loop axes are perpendicular to each other. With such an arrangement, the plane of polarization of the received radio wave can be made different, and a polarization diversity effect can be obtained. Therefore, the reception level is measured by each of the two loop antennas 41a, 41b and 42a, 42b, and the larger measured value is adopted.
- the reason for adopting the larger measured value is to avoid a point where the reception level is reduced due to cancellation of multipath radio waves due to fading.
- the larger measured value is obtained by each of the first and second diversity antennas 41 and 42, and the difference D value of the reception level is obtained by using this value. Based on the D value, the determination unit 5 determines whether the communication is normal communication or abnormal communication as in the first embodiment.
- the discrimination accuracy of abnormal communication can be improved by using a diversity antenna for the antenna of the reader / writer 10 configured by the antenna variable unit 32 shown in the second embodiment.
- the wireless tag 8 when a plurality of reader / writers 10 are arranged as shown in FIG. 10, the wireless tag 8 performs wireless communication with one of the reader / writers 10b. Even so, the other reader / writers 10a and 10c adjacent to each other do not wirelessly communicate with the wireless tag 8.
- the three reader / writers 10a, 10b, and 10c described in the first to fourth embodiments are arranged adjacent to each other while maintaining a certain distance L.
- the wireless tag 8 performs wireless communication with one of the reader / writers 10b by setting the predetermined value D0 to an appropriate value regardless of the distance L, Other adjacent reader / writers 10 a and 10 c do not wirelessly communicate with the wireless tag 8.
- This embodiment has a configuration different from those of the first to fourth embodiments, and even when the reader / writers 10 are arranged adjacent to each other at a short distance, the reader / writer 10 A description will be given of communication that can be determined as abnormal communication with a wireless tag 8 that does not exist above its own reading surface 7.
- FIG. 11 is a block diagram showing a configuration of the reader / writer 10 according to the fifth embodiment of the present invention.
- the reader / writer 10 includes a receiving unit 3, a first loop antenna 81, a second loop antenna 82, and a third loop antenna that are electrically connected to the receiving unit 3 in the reader / writer housing 6.
- 83, a fourth loop antenna 84, and a fifth loop antenna 85 are arranged.
- the reception unit 3 includes a reception level detection unit 4 and a determination unit 5.
- the first loop antenna 81 is disposed in the upper part of the reader / writer housing 6 and in the vicinity of the reading surface 7, and is disposed in the approximate center of the reading surface 7.
- the receiving unit 3, the second loop antenna 82, the third loop antenna 83, the fourth loop antenna 84, and the fifth loop antenna 85 are arranged in the reader / writer housing 6 so as to surround the receiving unit 3 from four sides. It is arranged below. That is, the second loop antenna 82, the third loop antenna 83, the fourth loop antenna 84, and the fifth loop antenna 85 are arranged below the first loop antenna 81. Further, the second loop antenna 82 and the fourth loop antenna 84 are arranged so as to face each other. Further, the third loop antenna 83 and the fifth loop antenna 85 are arranged so as to face each other.
- the reception level between the reception level by the first loop antenna 81 and the reception level by the second loop antenna 82 is changed. From the difference, it can be determined whether the determination unit 5 is normal communication or abnormal communication by a malicious third party.
- the determination unit 5 knows that the wireless tag 8 is not located above the reading surface 7, and can determine that the communication is abnormal.
- the determination unit 5 can determine from which direction the radio wave from the wireless tag 8 has arrived by comparing the reception level of the third loop antenna 13 with the reception level of the fourth loop antenna 14. .
- FIG. 12 is a flowchart showing the operation of the present embodiment. The operation of this embodiment will be described with reference to FIG. First, from the start of operation (S121), the reception level detector 4 monitors the reception level of the first loop antenna 81 and measures the reception level B1 of the first antenna 81 with the reception level detector 4 (S122). . Next, the determination unit 5 determines whether or not the reception level B1 is greater than a predetermined reception level B0 (here, the reception level received at a distance of 5 cm is set), that is, B1> B0 (S123). .
- a predetermined reception level B0 here, the reception level received at a distance of 5 cm is set
- the determination unit 5 determines whether or not the reception level difference Y1 or the reception level difference Y2 is larger than a predetermined value Y0 (S129). If it is determined in step S129 that the reception level difference Y1 or the reception level difference Y2 is equal to or greater than the predetermined value Y0 (Yes in S129), it is determined that the communication is normal, and data communication is performed by two-way communication. (S130). On the other hand, when it is determined in S129 that the reception level difference Y1 or the reception level difference Y2 is smaller than the predetermined value Y0 (No in S129), the communication is determined to be abnormal communication. Thereafter, the process returns to step S122. If it is determined in step 122 that B1 ⁇ B0, the process returns to step S122. If it is determined in step S126 that D ⁇ D0, the process returns to step S124.
- the determination unit 5 in step S126 determines that the radio wave transmitted at a strong level from a long distance is in a short distance.
- the radio wave from the correct wireless tag can be distinguished.
- the determination unit 5 in step S129 determines the wireless It can be determined whether the radio wave transmitted from the tag 8 reaches from right above the reader / writer 10 or from front, rear, left and right of the reader / writer 10.
- the relationship between the reception levels of radio waves received by the first to fourth loop antennas 82 to 85 with respect to the distance between the reader / writer 10 and the wireless tag 8 is as shown in FIG.
- the reception level attenuates in inverse proportion to the square of the distance. Therefore, as the radio wave transmitted from the wireless tag 8 is directly above the reader / writer 10, the reception level difference Y1 or the reception level difference Y2 becomes smaller.
- the first loop antenna 81 is arranged above the reader / writer housing 6. According to this, even if a radio wave transmitted from a long distance is received from a difference in reception level based on a difference in distance between the first loop antenna 81 and the second loop antenna 82, a radio wave from a short distance is erroneously received. It is possible to prevent it from being judged. Note that such a determination is made with the third loop antenna 83 with respect to the first loop antenna 81 in addition to the difference in reception level based on the difference in distance between the first loop antenna 81 and the second loop antenna 82. Reception based on at least one of a difference in distance, a difference in distance between the first loop antenna 81 and the fourth loop antenna 84, and a difference in distance between the first loop antenna 81 and the fifth loop antenna 85 Can be done from the difference in level.
- the second loop antenna 82 and the fourth loop antenna 84 are arranged so as to face each other. Further, the third loop antenna 83 and the fifth loop antenna 85 are arranged so as to face each other. According to this, it is determined that the radio wave received from the wireless tag 8 has arrived from the lateral direction of the reader / writer 10, and abnormal communication from the wireless tag 8 disposed on the reading surface 7 of the adjacent reader / writer 10 is determined. be able to.
- the second loop antenna 82, the third loop antenna 83, the fourth loop antenna 84, and the fifth loop antenna 85 are not installed immediately below the second loop antenna 82. According to this, when the second loop antenna 82, the third loop antenna 83, the fourth loop antenna 84, or the fifth loop antenna 85 performs wireless communication with the wireless tag 8 directly above the reader / writer 10.
- the first loop antenna 81 or the circuit board that supports the first loop antenna 81 does not become an obstacle, and the antenna gain does not decrease.
- FIG. 13 is a block diagram showing a configuration of the reader / writer 10 according to Embodiment 6 of the present invention.
- the first loop antenna 11 is disposed above the reader / writer housing 6, in the vicinity of the reading surface 7, and approximately at the center of the reading surface 7.
- the second loop antenna 12 is disposed below the reader / writer housing 6 and is disposed at a location other than the approximate center of the reading surface 7. That is, the second loop antenna 12 is disposed in a direction different from the direction in which the wireless tag 8 and the first loop antenna 11 are arranged. Therefore, when the second loop antenna 12 performs wireless communication with the wireless tag 8, the first loop antenna 11 and the circuit board that supports the first loop antenna 11 do not become a communication obstacle, and the second loop antenna 12 Radio waves can be received at an appropriate reception level.
- FIG. 6 only what is shown in FIG. 6 has been described. However, the arrangement of the first antenna 1 and the second antenna 2 shown in FIGS. 1 and 9 and the first diversity antenna 41 and the second diversity are shown. The same concept can be applied to each of the arrangements of the antennas 42.
- the installation location of the receiving unit 3 is not related to achieving the effect of the present invention. Therefore, the installation location of the receiver 3 shown in FIGS. 1, 6, and 9 is an example and should not be specified.
- the present invention can determine abnormal communication by a malicious third party, it can be applied to a communication device that communicates with a wireless tag or the like.
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Abstract
Description
2 第2のアンテナ
3 受信部
4 受信レベル検出部
5 判定部
6 リーダライタ筐体
7,7a,7b,7c 読み取り面
10,10a,10b,10c リーダライタ
31 アンテナ
32 アンテナ可変部
11,81 第1のループアンテナ
12,82 第2のループアンテナ
41 第1のダイバーシチアンテナ
41a,41b,42a,42b ループアンテナ
42 第2のダイバーシチアンテナ
45 遠距離
46 無線タグ機
47 指向性アンテナ
48 強力な電波
71 プリント基板
72 バラン
73 ループエレメント
74 コネクタ
83 第3のループアンテナ
84 第4のループアンテナ
85 第5のループアンテナ DESCRIPTION OF
図1は、本発明の実施の形態1におけるリーダライタの構成を示すブロック図である。図1において、リーダライタ10は、本体としてのリーダライタ筐体6に、第1および第2のアンテナ1、2および受信部3を内蔵している。また図1に記載していないが、送信部や電源供給部、外部との有線通信部なども備えている。第1のアンテナ1は、リーダライタ筐体6の読み取り面7に比較的近接して取り付けられている。読み取り面7は、リーダライタ筐体6の表面の一面であり、電波送信体としての無線タグ8を近接させる面である。読み取り面7と無線タグ8の距離が所定の距離(例えば、5cm)以内になると、リーダライタ10が無線タグ8ありと判定し、双方で通信が開始される。 (Embodiment 1)
FIG. 1 is a block diagram showing a configuration of a reader / writer according to
図5は、本発明の実施の形態2におけるリーダライタ10の構成を示すブロック図である。図5において、本実施の形態のリーダライタ10は、1つのアンテナ31のみを有し、アンテナ31をリーダライタ筐体6の読み取り面7から離れる方向に(或いは近づく方向に)移動させるためのアンテナ可変部32を有している点が、実施の形態1とは異なる。アンテナ可変部32には、例えばモータや電磁コイルなどを用い、これらを駆動してアンテナ31を上下動させることができる。なお、実施の形態1と同一の構成要素については同一の符号を付けて説明は省略する。 (Embodiment 2)
FIG. 5 is a block diagram showing a configuration of the reader /
図6は、本発明の実施の形態3におけるリーダライタ10の構成を示すブロック図である。図6において、本実施の形態のリーダライタ10は、実施の形態1における第1および第2のアンテナ1、2に換えて、第1および第2のループアンテナ11、12を用いている点が、実施の形態1とは異なる。なお、実施の形態1と同一の構成要素については同一の符号を付けて説明は省略する。 (Embodiment 3)
FIG. 6 is a block diagram showing the configuration of the reader /
図9は、本発明の実施の形態4におけるリーダライタ10の構成を示すブロック図である。図9において、本実施の形態では、実施の形態1における第1および第2のアンテナ1、2に換えて、第1および第2のダイバーシチアンテナ41、42を用いている点が、実施の形態1とは異なる。なお、実施の形態1と同一の構成要素については同一の符号を付けて説明は省略する。 (Embodiment 4)
FIG. 9 is a block diagram showing the configuration of the reader /
実施の形態1から実施の形態4によれば、悪意の第三者が強い電波を放射する無線機によりリーダライタ10と通信を行ったとしても、その悪意の第三者の異常通信を判断することができる。 (Embodiment 5)
According to the first to fourth embodiments, even if a malicious third party communicates with the reader /
上記の観点に立てば、例えば図6に示す第1のループアンテナ11と第2のループアンテナ12を図13のように設置することが考えられる。図13は、本発明の実施の形態6におけるリーダライタ10の構成を示すブロック図である。 (Embodiment 6)
From the above viewpoint, for example, it is conceivable to install the
Claims (8)
- 電波送信体から送信された電波を受信する第1のアンテナと、
前記電波送信体から送信された電波を受信する第2のアンテナと、
前記第1のアンテナまたは前記第2のアンテナで受信した電波の受信レベルを検出する受信レベル検出部と、
前記受信レベル検出部により検出された前記第1のアンテナで受信した電波の受信レベル値と、前記受信レベル検出部により検出された前記第2のアンテナで受信した電波の受信レベル値とのレベル差に基づいて正常な通信であるか否かを判定する判定部とを備え、
前記電波送信体と前記第1のアンテナとの第1の距離が、前記電波送信体と前記第2のアンテナとの第2の距離よりも短くなるように前記第1および第2のアンテナを配置したリーダライタ。 A first antenna for receiving radio waves transmitted from a radio wave transmitter,
A second antenna for receiving radio waves transmitted from the radio wave transmitter;
A reception level detector that detects a reception level of a radio wave received by the first antenna or the second antenna;
The level difference between the reception level value of the radio wave received by the first antenna detected by the reception level detection unit and the reception level value of the radio wave received by the second antenna detected by the reception level detection unit And a determination unit for determining whether or not normal communication based on
The first and second antennas are arranged such that a first distance between the radio wave transmitter and the first antenna is shorter than a second distance between the radio wave transmitter and the second antenna. Reader / writer. - 前記判定部は、前記受信レベル検出部により検出された前記第1のアンテナで受信した電波の受信レベル値と、前記受信レベル検出部により検出された前記第2のアンテナで受信した電波の受信レベル値とのレベル差が、所定値よりも大きい値であった場合は前記正常通信と判定し、前記レベル差が前記所定値よりも小さい値であった場合は前記正常通信でないと判定する請求項1記載のリーダライタ。 The determination unit includes a reception level value of the radio wave received by the first antenna detected by the reception level detection unit, and a reception level of the radio wave received by the second antenna detected by the reception level detection unit. And determining that the normal communication is not performed when the level difference is smaller than the predetermined value when the level difference from the value is larger than a predetermined value. 1. The reader / writer according to 1.
- 前記第1のアンテナと前記第2のアンテナが1つのアンテナで構成され、前記1つのアンテナを前記第1の距離と前記第2の距離に配置されるように位置を変えるアンテナ可変部を備えた請求項1記載のリーダライタ。 The first antenna and the second antenna are composed of one antenna, and an antenna variable unit that changes the position of the one antenna so as to be disposed at the first distance and the second distance is provided. The reader / writer according to claim 1.
- 前記第1のアンテナは前記第2のアンテナよりも上方に配置された請求項1記載のリーダライタ。 The reader / writer according to claim 1, wherein the first antenna is disposed above the second antenna.
- 前記第1のアンテナと前記第2のアンテナとが向かい合う位置に配置された請求項1記載のリーダライタ。 The reader / writer according to claim 1, wherein the first antenna and the second antenna are arranged at positions facing each other.
- 前記第1のアンテナは、本体内部の上方に配置され、前記第2のアンテナを含む4個のアンテナが前記本体内部の下方に配置され、前記4個のアンテナはそれぞれ2個ずつ向かい合って配置された請求項1記載のリーダライタ。 The first antenna is disposed above the inside of the main body, the four antennas including the second antenna are disposed below the main body, and the four antennas are disposed so as to face each other by two. The reader / writer according to claim 1.
- 前記第1のアンテナおよび前記第2のアンテナはループアンテナである請求項1記載のリーダライタ。 The reader / writer according to claim 1, wherein the first antenna and the second antenna are loop antennas.
- 前記第1のアンテナおよび前記第2のアンテナはダイバーシチアンテナである請求項1記載のリーダライタ。 The reader / writer according to claim 1, wherein the first antenna and the second antenna are diversity antennas.
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BRPI0924115A2 (en) | 2016-10-04 |
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