JP4274135B2 - RFID tag - Google Patents

Description

  The present invention relates to an RFID tag capable of transmitting two or more types of IDs, and a system using the RFID tag.

  RFID that uses a minute radio wave to identify a person or an object by transmitting an ID from an RFID tag to an RFID tag reader has become widespread. As an example of a system using RFID, there are systems disclosed in Patent Document 1 and Patent Document 2.

  Patent Document 1 discloses a customer trend information collecting system using an RFID hanger with a sensor that senses attachment / detachment. In this system, when an RFID hanger with a sensor on which a product is suspended is removed from a hanger rack with an RF receiver, the RFID hanger with the sensor transmits an ID wirelessly, which product is selected by the customer. Is determined.

  Patent Document 2 discloses an abnormality inspection system using an IC tag (RFID tag) with a sensor for detecting a physical quantity. In this system, it is described that an IC tag with a sensor is installed at a location where a physical quantity is to be detected, and the IC tag transmits the ID and the physical quantity detected by the sensor to an IC tag reader.

Further, there are Patent Documents 3, 4, and 5 as documents related to the present application.
JP 2003-308429 A JP 2002-230675 A JP 2003-190227 A Japanese Patent Publication No. 7-34793 Japanese Patent No. 2700053

  The techniques described in Patent Documents 1 and 2 have the following problems.

  In the system described in Patent Document 1, when the ID is not received by the RF receiver, (1) the product is not selected and the ID is not transmitted, or (2) RFID There is a problem that communication cannot be performed because the distance between the hanger and the RF receiver is too large, so that it is impossible to distinguish whether the ID is not received.

  Further, in the system described in Patent Document 2, it is necessary to prepare an IC tag and an IC tag reader capable of communicating two types of information, an ID and a physical quantity, and a general RFID capable of communicating only one type of ID. There is a problem that the tag and the RFID tag reader cannot be used. Further, if an IC tag capable of communicating two types of information, ID and physical quantity, is to be realized from the creation of an IC chip, there is a problem that it cannot be easily realized.

  The present invention has been made in view of the above points, and an object thereof is to provide an RFID tag that can transmit two or more types of IDs and can be easily realized.

In order to solve the above problems, the present invention provides an RFID tag including two individual RFID tags each including an antenna, a logic circuit storing an ID, and a switch capable of connecting the antenna and the logic circuit. The first switch that is one of the two individual RFID tags is the first switch of the two states notified from the external device connected to the RFID tag. The antenna and the logic circuit are in a conductive state, and the other second switch is in a non-conductive state between the antenna and the logic circuit. the configuration between the first switch and the logic circuit and the antenna to a non-conductive state, the second switch as an RFID tag to a conductive state between said antenna logic circuit It is.

  Further, the present invention is an RFID tag comprising an antenna, two logic circuits storing IDs, and a switch capable of connecting the antenna and one of the two logic circuits, For the first state out of the two states notified from the external device connected to the RFID tag, the switch is a logic circuit that is one of the antenna and the two logic circuits. A switch between the first logic circuit and the antenna and the second logic circuit; It can also be configured as an RFID tag in which the antenna and the first logic circuit are in a non-conductive state and the antenna and the second logic circuit are in a conductive state.

  The RFID tag may be an active type, and a plurality of logic circuits may share one battery. Further, ID transmission time intervals in a plurality of logic circuits included in the RFID tag may be different from each other.

  The present invention also provides an RFID including M (M is an integer greater than 1) individual RFID tags each including an antenna, a logic circuit storing an ID, and a switch capable of connecting the antenna and the logic circuit. A tag, which converts a certain state among a plurality of states notified from an external device connected to the RFID tag into an M-digit binary representation, and includes 1 or 0 bits in the binary representation An individual RFID tag corresponding to a predetermined bit position may be configured as an RFID tag including an encoding unit that transmits a signal for turning on a switch. The M may be a number obtained by adding the number of redundant bits to the number of bits necessary for expressing the plural types of states in binary.

It is possible to provide an RFID tag that can transmit two or more types of IDs and can be easily realized.

  Embodiments of the present invention will be described below with reference to the drawings. In describing this embodiment, a normal RFID tag will be described first.

  FIG. 1 is a diagram showing a passive RFID tag 3 that receives an electric wave (request signal) from an RFID tag reader 1 and transmits an ID. As shown in FIG. 1, the passive RFID tag 3 has a configuration in which a logic circuit 31 including a memory 311 for storing an ID and an antenna 32 are connected. The logic circuit 31 is realized as an IC chip, and is a circuit for receiving a signal from the RFID tag reader 1 and reading the ID from the memory 311 and performing control for wireless transmission.

  In the passive type, a voltage is induced in the antenna (antenna coil) 32 of the RFID tag 3 by the electromagnetic induction action by the radio wave emitted from the RFID tag reader 1, and the logic circuit 31 is activated by this voltage to communicate with the RFID tag reader 1. Done.

  FIG. 2 is a diagram showing an active RFID tag 5 having a battery. The active RFID tag includes a logic circuit 51 including a memory 511 for storing an ID, and a battery 55 in addition to the antenna 53. By using the power of the battery, the RFID tag transmits the radio wave by itself to the RFID. Transmit to the tag reader 7. In the RFID tag 5 described above, the memory 511 may be a read-only type or a read / write type.

  Next, the RFID tag in this embodiment will be described.

(Passive RFID tag that can transmit two types of ID)
FIG. 3 shows a configuration example of a passive RFID tag capable of transmitting two types of IDs. The RFID tag illustrated in FIG. 3 includes two RFID tags illustrated in FIG. 1 each including a switch. The two RFID tags 10 and 12 are set in one housing, for example. Each RFID tag includes a switch on a connection line between the logic circuit and the antenna. Each RFID tag transmits an ID stored in its own memory when a request from the RFID tag reader is received when the switch is in a conductive state, but when the switch is in a non-conductive state, an antenna and a logic circuit Is not connected, so it will not send anything even if it receives a request from the reader.

  As shown in FIG. 3, the RFID tag is used by being connected to a sensor 14 that can output signals indicating two types of states, that is, an ON state or an OFF state. Each RFID tag is wired so that a signal from the sensor is transmitted to the switch.

  In addition, when the signal from the sensor indicates the ON state, the switch of one RFID tag conducts between the logic circuit and the antenna, and the switch of the other RFID tag does not connect between the logic circuit and the antenna. Make it conductive. Further, when the signal from the sensor is a signal indicating the OFF state, the switch of the one RFID tag makes a non-conduction state between the logic circuit and the antenna, and the switch of the other RFID tag connects the logic circuit and the antenna. Make it conductive.

  Note that a current having a voltage higher than a predetermined value can be supplied as a signal indicating the ON state, and no current can be supplied as a signal indicating the OFF state, or a current having a voltage lower than the predetermined value can be supplied. . As the switch, any circuit can be used as long as it can realize a non-conductive state and a conductive state for such a signal.

  In the RFID tag shown in FIG. 3 configured as described above, if the sensor 14 is in an ON state, the RFID tag 10 transmits IDA and the RFID tag B does not transmit anything in response to a request from the RFID tag reader. . On the other hand, if the sensor 14 is in the OFF state, the RFID tag 12 transmits IDB in response to a request from the RFID tag reader, and the RFID tag 10 does not transmit anything. Therefore, the RFID tag of FIG. 3 operates to transmit IDA when the sensor is on as a whole and transmit IDB when the sensor is off. That is, two types of IDs can be transmitted according to the two types of states of the sensor. Further, when the RFID tag reader does not receive either of the two types of IDs, it can be determined that the remote is out of reach of radio waves.

  The RFID tag shown in FIG. 3 can be created by providing two RFID tags provided with a switch in a connection line between a logic circuit that is an IC chip and an antenna formed by a coil. It is not necessary to modify the system and can be realized easily.

  FIG. 4 shows another configuration example of a passive RFID tag capable of transmitting two types of IDs. The RFID tag shown in FIG. 4 has a configuration in which two logic circuits 16 and 18 share one antenna 20. Note that each logic circuit itself shown in FIG. 4 can be the same as that used in a normal RFID tag.

  In the configuration of FIG. 4, the antenna 20 and the two logic circuits 16 and 18 are connected by the switch 22. For example, when the switch 22 receives a signal indicating an ON state from the sensor 14, the switch 22 is in a conductive state between the logic circuit 16 and the antenna 20, and is not in a conductive state between the logic circuit 18 and the antenna 20. Further, when an OFF state signal is received from the sensor 14, the logic circuit 16 and the antenna 20 are turned off and the logic circuit 18 and the antenna 20 are turned on. According to such an RFID tag, it is possible to transmit IDA when the sensor 14 is in the ON state and transmit IDB when the sensor is in the OFF state.

  In the example of FIG. 4 as well, since the logic circuit itself can use a normal one, it is only necessary to configure the antenna part and the switch part made of a coil as shown in FIG. And can be realized easily.

  According to the RFID tag as described above, it is possible to identify three states: an ON state, an OFF state, and a radio wave non-transmission state. Since the RFID tag reader can originally receive a plurality of types of IDs, a conventional RFID tag reader can be used as it is.

(Active RFID tag that can transmit two types of ID)
FIG. 5 is a diagram showing a configuration of an active RFID tag capable of transmitting two types of IDs. As in the case of the passive type described with reference to FIG. 3, the normal active RFID tag is provided with two switches provided with switches. Also in the configuration shown in FIG. 5, IDA is transmitted when the sensor 14 is in the ON state, and IDB is transmitted when the sensor is in the OFF state. Similarly to the case of FIG. 4, the active type can be configured to share an antenna. Further, a battery for supplying power to the logic circuit may be shared.

  Now, in an active RFID having a battery inside, the frequency of ID transmission and the battery life are in a trade-off relationship. That is, when IDs are transmitted at short time intervals, IDs are transmitted many times in a fixed time, resulting in increased power consumption per unit time and shorter battery life. On the other hand, if the ID is transmitted at long intervals, the battery life can be extended. Further, from the viewpoint of the use of the RFID tag, it is preferable that the ID transmission time interval when the RFID tag is used for urgent use is shorter than that when the RFID tag is not used.

  In a normal RFID tag, the transmission time interval is fixedly set. However, in the configuration shown in FIG. 5 in the present embodiment, the time interval for transmitting the ID is different between the ON state and the OFF state. can do. For example, as shown in FIG. 6, one RFID tag has a short ID transmission time interval (ID transmission cycle A), and the other has a long ID transmission cycle (ID transmission cycle B). The RFID tag that transmits the ID in the more urgent state (for example, the ON state) uses the one with the short ID transmission time interval, and the ID tag that transmits the ID in the other state (the OFF state). An RFID tag having a long ID transmission time interval is used. The battery is shared. This makes it possible to achieve both urgency and battery life. A specific application example of the RFID tag will be described later.

  According to the RFID tag as described above, it is possible to identify three states: an ON state, an OFF state, a radio wave non-transmission state, or a battery exhaustion. A conventional RFID tag reader can be used as it is.

(RFID tag that can send more than 3 types of ID)
FIG. 7 shows a configuration example of an RFID tag 60 capable of transmitting three or more types of IDs. The RFID tag illustrated in FIG. 7 includes M RFID tags each having the switch described above. Each of the M RFID tags transmits a unique ID (ID1 to IDM). The RFID tag 60 receives a signal corresponding to any one of the states 1 to N output from the sensor, expresses the signal in an M-bit binary number, and 1 in the M-bit information. Alternatively, an encoding unit 62 that instructs the RFID tag corresponding to the position of the predetermined bit among the 0 bits to turn the switch on is provided. The encoding unit 62 performs error detection code or error correction code processing, and M is the number of bits necessary to represent N states in binary representation + the number of redundant bits.

  That is, assuming that the RFID tag corresponding to the position of 1 bit is to be in a conductive state, when the k-th bit in the M bit representation is 1, the switch of the logic circuit k is turned ON (conductive state), When it is 0, it is turned OFF.

  For example, when M is 5 and logic circuit 1, logic circuit 2, logic circuit 3, logic circuit 4, and logic circuit 5 are present, the value of the M-bit representation output by encoding unit 62 is 10100. In addition, a signal indicating a conductive state is sent to the switch of the logic circuit 1 and the switch of the logic circuit 3, and a signal is not sent to the switches of the logic circuits 2, 4, and 5 or a non-conductive state is indicated. A signal is sent. In addition, it may be considered that a signal indicating a non-conduction state is transmitted that no signal is transmitted. In this case, a unique ID is transmitted from each of the two RFIDs of the logic circuits 1 and 3, but nothing is transmitted from the other RFIDs. Note that the above-described encoding unit 62 can be realized as a logic circuit.

  The RFID tag reader 64 or a server that receives a signal from the RFID tag reader 64 includes a decryption unit 66. The decryption unit 66 sets the bit position in the M-bit expression corresponding to the position of the individual RFID tag in the RFID tag 60 corresponding to the received ID of the RFID tag 60 to 1, and the RFID tag of the ID that has not been received. An M-bit representation is generated with the bit position corresponding to the position set to 0. The sensor state (any one of 1 to N) is detected by performing the inverse operation of the encoding unit 62 on the obtained M-bit representation.

  In addition to the above-described configuration, the RFID tag capable of transmitting three or more types of IDs may have a configuration in which one ID is assigned to each of N states as shown in FIG. That is, in the configuration illustrated in FIG. 8, when the output unit 70 receives the k state from 1 to N from the sensor, the output unit 70 transmits a signal instructing the conduction state to the switch of the kth RFID tag. For example, when N is 5 and the logic circuit 1, the logic circuit 2, the logic circuit 3, the logic circuit 4, and the logic circuit 5 exist, when the output unit 70 receives the state “3”, the output unit 70 outputs an ON signal (a signal indicating a conduction state) to the switch of the logic circuit 3, and the RFID tag transmits a unique ID thereto. On the RFID tag reader side, the state is detected by detecting that the ID is from the third RFID tag.

  The configuration shown in FIG. 8 requires N RFID tags. Therefore, although depending on the length of redundant bits, the configuration shown in FIG. 8 requires more RFID tags than the configuration shown in FIG. However, in the case of the configuration shown in FIG. 8, since the state and the ID correspond one-to-one, there is an advantage that it is possible to notify that a plurality of states have occurred simultaneously.

  In addition, in the configuration shown in FIG. 7, the number of IDs required when the number of states is large can be suppressed to a low level, and redundant information is used as an error detection code or error correction code, so that ID information based on radio wave conditions and the like can be obtained. There is an advantage that it is possible to recover from the missed out.

(Example of system using RFID tag)
Next, a system using an RFID capable of transmitting two types of IDs according to the state from the sensor as shown in FIGS. 3 to 5 will be described. Here, an example will be described in which the RFID tag is applied to a system using a rising detection sensor that detects that a bed user (caregiver, care recipient, etc.) has risen from the bed.

  In addition, the rising sensor itself which notifies whether the user of the bed is getting up is turned on and off is known, for example, a sensor using a weight sensor (see Patent Document 3) or an infrared sensor (Patent Document). 4), those using a contact type sensor (see Patent Document 5), those using a pressure sensor, and the like are known. Therefore, the rising detection sensor itself will not be described in detail here. The rising detection sensor to which the RFID of the present invention is applied may be any rising detection sensor that outputs a result as two types of information such as ON and OFF. In the following, an example in which the RFID tag of the present invention is applied to a rising detection sensor will be described. However, the present invention is not limited to a rising detection sensor, and any sensor that outputs results as two types of information such as ON and OFF. The RFID tag of the present invention can be applied to a simple sensor to notify the state.

  FIG. 9 shows the system configuration of this embodiment. The system of the present embodiment shown in FIG. 9 has a rising detection sensor 80 installed in a bed, an RFID tag 82 (which may be either a passive type or an active type) according to the present invention, an RFID tag reader 84, and a processing server 86. is doing. The RFID tag reader 84 and the processing server 86 are connected by a network 88 such as a LAN.

  The RFID tag in FIG. 9 can transmit two types of IDs (IDA and IDB) according to the ON / OFF state from the rising detection sensor 80 as described with reference to FIGS. The RFID tag reader 84 has a function of transmitting the received ID information to the processing server 86 via the network 88.

  FIG. 10 shows a functional configuration of the processing server 86. As shown in the figure, the processing server 86 includes a state detection unit 90, an event issue unit 92, a history access unit 94, and a storage unit 96. In the storage unit, an ID / state correspondence table in which the correspondence between the ID and the state of the rising detection sensor is recorded as shown in FIG. 11A, and the rising detection sensor as shown in FIG. Stores an event correspondence table that records the correspondence between states and events to be executed corresponding to the states. The processing server 86 is realized by mounting a program for executing processing described later on a computer. Hereinafter, the operation of the system will be described with reference to the flowchart of FIG.

  First, the RFID tag 82 transmits the ON / OFF state of the rising detection sensor 80 to the RFID tag reader 84 as one of two types of IDs (IDA, IDB) (step 1). Further, the RFID tag reader 84 transmits the received ID to the processing server 86 via the network 88 (step 2).

  Then, the state detection unit 90 of the processing server 86 that has received the ID refers to the ID / state correspondence table to detect which state of the detection sensor 80 the received ID rises to correspond to (step 3). Subsequently, the event issuing unit 92 grasps the event corresponding to the detected state by referring to the event correspondence table, and executes the event (step 4). For example, if the nurse call is to be turned ON, the event issuing unit 92 informs the nurse call center device that there has been a rise in the bed with the RFID tag corresponding to the received ID information via the network. Notice. Moreover, when notifying to a security room, said information is notified to the terminal arrange | positioned in a security room via a network.

  The history access unit 94 of the processing server 86 has a function of storing the received ID in the recording unit 96 as history information together with the time when the ID is received, and a function of outputting the stored history information. This makes it possible to browse the history of ID reception.

  For example, when this system is used in a hospital, it is conceivable that an RFID tag is installed in each bed in each hospital room, an RFID tag reader is installed in each hospital room, and a hospital LAN is used as the network 88. . In this case, the RFID tag reader sends the reader ID together with the received ID information of the RFID tag to the processing server 86, so that the hospital room can be identified on the processing server side.

  In addition to the above-described configuration, the processing server itself can have a function of the RFID tag reader 84 so that the network 88 can be omitted.

  In the system shown in FIG. 9, a sensor that transmits three or more types of states is used as a sensor, and an RFID tag that can transmit three or more types of IDs as shown in FIGS. 7 and 8 is used as an RFID tag. Also good. In this case, the ID / state correspondence table on the processing server side uses the one in which the state of the sensor corresponding to each ID is recorded, and the event correspondence table uses the one in which the event corresponding to each state is recorded.

  As a sensor for transmitting three or more types of statuses, for example, when a bed user grasps the fence of the bed, a sensor that can detect not only the position of the fence but also the position of the fence is used. be able to. A configuration example of such a sensor is shown in FIG.

  As shown in FIG. 13, the pressure-sensitive area for detecting grasping is divided into a plurality of parts, and the divided areas are divided into handrail portions extending in the lateral direction constituting the fence, and the vertical direction for supporting this. Attach to each of the multiple pillars extending to Then, the sensor control device sends a signal corresponding to the area grasped by the user to the RFID tag, and the RFID tag sends an ID corresponding to the signal. In such a device, when the total number of each part is (N-1), it is necessary to communicate a total of N states, including the case where any one of these parts is ON and the case where all of them are OFF. However, by using an RFID tag that can transmit three or more types of IDs according to the present invention, it is possible to notify the RFID tag reader and the processing server of these N types of states.

  In addition to using a sensor divided into a plurality of areas as described above, three or more types of IDs are transmitted even when there is only one sensor and it is necessary to distinguish a plurality of states from the sensor information. Possible RFID tags can be used. For example, depending on the strength of the sensor information, it is transmitted by distinguishing whether the fence is strongly held or lightly touched, or the fence is pressed outward, pulled inward, or pressed down from above Therefore, it is necessary to communicate N states, and the above RFID tag can be applied.

  Further, if a physical quantity is expressed by a plurality of bits by using an RFID tag capable of transmitting three or more types of IDs, the system in Patent Document 2 (Japanese Patent Laid-Open No. 2002-230675) can be used as a special RFID for ID and physical quantity communication. Without using a tag and an RFID tag reader, it can be realized by a combination of ordinary RFID tags and an ordinary RFID tag reader.

  In the above-described system, when an active RFID tag is used, as described with reference to FIG. 6, ID is transmitted at a short time interval in the ON state, and at a longer time interval in the OFF state. Can be used. Thereby, both urgency and battery life can be achieved.

[Change of ID transmission time interval in passive RFID tag]
A passive RFID tag transmits its own ID by receiving a request signal transmitted from an RFID tag reader. Therefore, the RFID tag reader side determines the time interval at which the RFID tag and the RFID tag reader communicate ID information. As described above, this time interval is determined according to the purpose of use, such as a short time interval when the urgency is high.

  However, if the time interval is short, the RFID tag information is read frequently, so that the state of the RFID tag can be grasped in a timely manner, while the number of ID information to be read increases (the same ID is read many times). Therefore, there is a possibility that problems such as an increase in the load on the RFID tag reader, an increase in power consumption of the ID tag reader, and an increase in the influence on the human body and surrounding devices due to an increase in emitted radio waves may occur. On the other hand, if the ID transmission time interval is long, there is a possibility that the ID detection may be leaked. For example, if an RFID tag reader is installed at the gate and the passage of an article attached with an RFID tag is detected as an example, if the time interval is too long, the article will pass during reading and detection of passage May be leaked.

  In order to solve the above problems, the time interval (cycle) at which the request signal is transmitted from the RFID tag reader may be changed adaptively according to the urgency. That is, when the urgency is high, the request signal transmission frequency is increased, and when the urgency is low, the request signal transmission frequency is decreased. As a result, in situations where urgency is high, it is possible to reduce missed reading of IDs, and in situations where urgency is low, it is possible to reduce power consumption and reduce emitted radio waves.

  In order for the RFID tag reader to recognize whether the urgency is high or low, for example, in addition to the status information such as ON, OFF, etc., to the sensor, a function for sending a signal indicating whether or not the urgency is high is added, It is conceivable to use an RFID tag capable of transmitting three or more types of ID information. In this case, the RFID tag reader shortens the time interval of the request signal after the RFID tag transmits a signal indicating that the urgency is high. In the example of the fence shown in FIG. 13, it can be considered that the urgency is high when a specific pillar is held.

  Further, the passive RFID system described above can be applied to an automatic checkout apparatus for cash registers in a supermarket or the like. In such an automatic settlement apparatus, an ID tag is attached to an individual product, and when passing through the settlement gate, the ID of the RFID tag is read by an RFID tag reader, whereby the purchased item is specified and the price is settled. The presence of a shopping cart on which a product is placed is detected in advance, and the timing at which the cart passes through the checkout gate determines that the urgency of reading the ID is high, and increases the frequency of request signal transmission from the RFID tag reader. Further, the request signal transmission frequency is lowered at the timing when the cart does not pass. Thereby, the possibility of leaking the detection of the passage described above can be reduced. In the above system, it can be detected that the cart passes through the checkout gate, for example, by attaching an RFID tag to the cart and reading the ID of the RFID tag attached to the cart by the RFID tag reader.

(Regarding the effects of the system according to the present embodiment)
As described above, in the system according to this embodiment, the state is notified using the RFID tag.

  Conventionally, after detecting the state of a cared person by various sensors, it has been performed using a wired cable to notify a caregiver placed in a nurse center or the like. When it takes time for installation or when the bed is moved between hospital rooms, it is necessary to reconnect the cables, which is an operation burden on the caregiver. In addition, there is a possibility of causing accidents such as a patient tripping in the hospital room. On the other hand, in the system according to the present embodiment, since the RFID tag reader can be notified of the state wirelessly using the RFID tag, the above problem is solved.

  The use of a wireless LAN instead of an RFID tag solves the problem of wired cables, but wireless LAN systems are more expensive, consume more power, and are larger than RFID systems. According to the system of this form, the system can be realized at a lower price.

  In addition, in order to prevent misuse of patients in the hospital and administration of wrong drugs, RFID tags are attached to patients and drugs, and patient and drug presence information is automatically acquired, and patients are placed in the wrong place. And systems for detecting the presence of chemicals. For such purposes, RFID tag readers for detecting the presence of RFID tags are installed in various places in hospitals. According to the system according to the present embodiment, they are thus widely used in hospitals. There is also an advantage that RFID which is being used can be utilized.

  The present invention is not limited to the above-described embodiment, and various modifications and applications can be made within the scope of the claims.

It is a figure which shows a passive type RFID tag. It is a figure which shows an active type RFID tag. It is a figure which shows the passive type RFID tag which can transmit two types of ID. It is a figure which shows another example of the passive type RFID tag which can transmit two types of ID. It is a figure which shows the active RFID tag which can transmit two types of ID. It is a figure which shows the active type RFID tag which can change ID transmission time interval with a state. It is a figure which shows the RFID tag which can transmit 3 or more types of ID. It is a figure which shows another example of the RFID tag which can transmit 3 or more types of ID. It is a figure which shows the example of the system using an RFID tag. It is a figure which shows the function structure of a processing server. It is a figure which shows an ID / state correspondence table and an event correspondence table. It is a flowchart for demonstrating operation | movement of a system. It is a figure which shows an example of the sensor which can transmit 3 or more types of states.

Explanation of symbols

1, 7, 64, 84 RFID tag reader 3, 5, 10, 12, 24, 26, 60, 82 RFID tag 16, 18, 31, 51 Logic circuit 20, 32, 52 Antenna 14 Sensor 22 Switch 62 Encoding unit 64 RFID tag reader 66 Decoding unit 70 Output unit 80 Wake-up detection sensor 86 Processing server 88 Network 90 Status detection unit 92 Event issuing unit 94 History access unit 96 Storage unit

Claims (6)

An RFID tag comprising two individual RFID tags comprising an antenna, a logic circuit storing an ID, and a switch capable of connecting the antenna and the logic circuit,
For a first state out of two states notified from an external device connected to the RFID tag, the first switch, which is one switch in the two individual RFID tags, includes the antenna and the logic. The second switch is in a non-conductive state between the antenna and the logic circuit;
With respect to the second state of the two types of states, the first switch is in a non-conductive state between the antenna and the logic circuit, and the second switch is the antenna and the logic circuit. An RFID tag characterized by being configured to be in a conductive state. An RFID tag comprising an antenna, two logic circuits storing IDs, and a switch capable of connecting the antenna and one of the two logic circuits,
For the first state out of the two states notified from the external device connected to the RFID tag, the switch is a logic circuit that is one of the antenna and the two logic circuits. A conduction state between the first logic circuit and a non-conduction state between the antenna and the second logic circuit;
With respect to the second state of the two types of states, the switch makes a non-conduction state between the antenna and the first logic circuit and between the antenna and the second logic circuit. An RFID tag characterized by being configured to be in a conductive state. The RFID tag according to claim 1 or 2 , wherein the RFID tag is an active type, and a plurality of logic circuits share one battery in the RFID tag. The RFID tag according to any one of claims 1 to 3, wherein transmission time intervals of IDs in a plurality of logic circuits included in the RFID tag are different from each other. An RFID tag including M individual RFID tags (M is an integer greater than 1) including an antenna, a logic circuit storing an ID, and a switch capable of connecting the antenna and the logic circuit,
One of a plurality of states notified from an external device connected to the RFID tag is converted into an M-digit binary representation, and a predetermined one of 1 or 0 bits in the binary representation An RFID tag, comprising: an individual RFID tag corresponding to a bit position, and an encoding unit that sends a signal for turning on a switch. 6. The RFID tag according to claim 5 , wherein M is a number obtained by adding the number of redundant bits to the number of bits necessary for expressing the plurality of types of states in binary numbers.

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