JP4919489B2 - Passage management system - Google Patents

Description

  The present invention is used in an RFID (RADIO FREQUENCY IDENTIFICATION) system, and a responder (IC tag) is activated in a non-contact manner from an interrogator, receives information, and returns its identification information. The present invention relates to a passage management system realized as a non-contact IC tag system or an IC card system.

  A typical prior art of the passage management system as described above is disclosed in Patent Document 1. FIG. 15 is a diagram for explaining the passage management system according to the prior art. The passage management system detects an object passing through the wall 1 from one side to the other side (in the example of FIG. 15, the user 2 enters the room 3 from the outside to the inside), for example, As shown in FIG. 15, when used for room entry / exit management, it is possible to manage which user is in the room 3 and at what time, and is used for article management. It is possible to manage which products are received and received at what time, and how many products are in the warehouse.

  This passage management system includes an infrared transmitter 4 which is an activation device and a management device 5 which constitutes an authentication device, and a response device 6 made of an IC tag. The infrared transmitters 4 are arranged inside and outside the wall 1 and irradiate infrared rays with different IDs superimposed on a narrow authentication area 7. The responder 6 that has received the infrared rays wirelessly returns a response signal including its own identification information to the identification information (ID) of the infrared transmitter 4. The response signal is received by the antenna 8, and the management device 5 unlocks the door 9 if the identification information is registered in advance.

  However, the above-described prior art uses infrared light to activate the responder 6. Infrared rays are convenient for forming the narrow authentication area 7 as described above. However, for example, when the infrared transmitter 4 is installed on the ceiling and the name tag type responder 6 faces downward, it does not react. In some cases, it is inconvenient. Therefore, in order to solve such a problem, a conventional technique using the LF band for activation is proposed in Patent Document 2.

  FIG. 16 is a diagram for explaining a passage management system according to the prior art of Patent Document 2. In FIG. In FIG. 16, the configuration is similar to that of FIG. 1 described above, and corresponding portions are denoted by the same reference numerals and description thereof is omitted. This passage management system includes an interrogator 14 that constitutes the activation device and the authentication device, and a management device 10 that manages them, and a response device 16 that includes the IC tag.

  FIG. 17 is a block diagram showing an electrical configuration of the interrogator 14 and the responder 16. In the interrogator 14, the control circuit 11 generates an activation signal including unique identification information (ID) set in advance in the interrogator 14, and superimposes and amplifies it on the signal component of the induced magnetic field in the LF band transmission circuit 12. Then, the data is transmitted from the LF antenna 13 toward the responder 16 by the first wireless communication method (LF). As a result, an authentication area 17 is formed around the responder 16, and in the responder 16 possessed by the user 2 and the like that has entered the authentication area 17, the activation signal from the interrogator 14 is received by the LF antenna 21. After receiving, the LF band receiving circuit 22 activates the control circuit 23, and the control circuit 23 includes a response signal including unique identification information (ID) set in advance in the identification information of the interrogator 14. Is transmitted from the RF transmission / reception circuit 24 to the interrogator 14 via the RF antenna 25 by the second wireless communication method (UHF).

  The response signal is received by the RF transmission / reception circuit 15 from the RF antenna 20 of the interrogator 14 and input to the control circuit 11 to identify the responder 16 that has responded. If the identified responder 16 has identification information registered in advance, the control circuit 11 can transmit the RF transceiver circuit 15 through the RF antenna 20 in the second wireless communication method (UHF). The identification information of the responder 16 that has been authenticated is transmitted as an ACK signal. When the ACK signal is received from the RF antenna 25 by the RF transmission / reception circuit 24, the control circuit 23 ends the transmission of the response signal.

  When the authentication is completed, the control circuit 11 indicates the completion of authentication with the display unit 18 and the buzzer 19 and simultaneously unlocks the door 9. Further, the management device 10 manages which user is present in the room 3 and at what time it enters and exits from the authentication result of the control circuit 11, and which product arrives and arrives at what time. And how many products exist in the warehouse.

Thus LF band (long wavelength band: 30~300kHz) in force Doshingo activates the transponder 16, the control circuit 23, the RF transceiver circuitry 24, the internal battery 26 as a power source, UHF band (ultra high frequency band : 300 MHz to 3 GHz) is returned. With such a configuration, it is cheap and easy to use (the direction is not limited), and the authentication area 17 can be accurately defined in a relatively narrow range of 1.5 to 2 m. Furthermore, the power consumption of the RF transmission / reception circuit 24 in the UHF band is as large as 10 to 20 mA, whereas the LF band reception circuit 22 in the LF band operates with a weak power of several μA. By not using the circuit 24, the power consumption of the internal battery 26 is suppressed, and the life of the responder 2 is extended.
JP 2006-72706 A Japanese Patent Laid-Open No. 2003-21679

  However, although the radio wave type is cheap and easy to use as described above, there is still a problem that radio wave interference (overlap of the authentication area 17) occurs. Further, since the LF band passes through the structure, when two interrogators are installed in front of and behind the wall surface, the direction of passage cannot be determined without knowing which interrogator has received the activation signal. On the other hand, in construction, there is a demand for the interrogator 14 to be installed in a place near the wall 1.

  The objective of this invention is providing the passage management system which can eliminate the interference between the interrogators installed in the both sides of the wall also by the radio wave type.

The passage management system according to the present invention includes a plurality of pairs of interrogators and one or a plurality of responders, and the interrogator transmits an activation signal including its own identification information by the first wireless communication method. Then, the responder is activated in response to the activation signal, and returns a response signal including its own identification information in the second wireless communication method, so that the interrogator moves from one side of the area to the other. In the passage management system for detecting the transponder passing to the side, the transmission power of the activation signal includes a predetermined first transmission power and a predetermined second transmission power smaller than the first transmission power. Set, and when one interrogator of the pair of interrogators transmits with the first transmission power, the other interrogator transmits with the second transmission power . The interrogator is composed of the start signal Is configured to send, provided with a level adjusting means capable of adjusting at least the second transmission power, said level adjusting means comprises a receiver for maintenance for receiving the activation signal, for the maintenance Detecting means for detecting the level difference between the start signals received by the interrogators received by the receivers, and obtaining respective second transmission powers capable of obtaining a desired D (desired wave) / U (interference wave) ratio; Transmission means configured to transmit and set the second transmission power obtained by the calculation means to each interrogator by the second wireless communication method is characterized.

The passage management system according to the present invention includes a plurality of pairs of interrogators and one or a plurality of responders, and the interrogator uses an activation signal including its own identification information as a first wireless communication method. The responder is activated in response to the activation signal, and a response signal including its own identification information is returned in the second wireless communication method, so that the interrogator becomes one side of the area. In the passage management system for detecting the transponder passing from the first side to the other side, the transmission power of the activation signal includes a predetermined first transmission power and a predetermined second transmission power smaller than the first transmission power. And when one interrogator of the pair of interrogators transmits with the first transmission power, the other interrogator transmits with the second transmission power, The pair of interrogators are And a level adjusting means capable of adjusting at least the second transmission power. The level adjusting means is provided in each interrogator and is activated by another interrogator. A receiver for receiving a signal, and a calculation means for detecting a level of the activation signal received by the receiver and obtaining a second transmission power capable of obtaining a desired D (desired wave) / U (interfering wave) ratio; The second transmission power obtained by the calculation means is transmitted to the other interrogator and is configured to include transmission means for setting.

  According to said structure, the interrogator which makes a pair gives the starting signal of the LF band containing the identification information (ID) set to self separately to a coil, an induced magnetic field is generated, and 1st radio | wireless The response is transmitted to the responder by the communication method, the responder receives the induced magnetic field by the coil and is activated by the electromotive force, and the UHF band signal which is the second wireless communication method is used as the identification information of the interrogator. The response signal including identification information (ID) set individually in advance is returned and the response signal is received by the pair of interrogators so that the response passes from one side of the area to the other side. In the passage management system used in combination with the LF band and the UHF band, the pair of interrogators transmits the activation signal in a reciprocal operation. That is, each interrogator periodically generates an induction magnetic field of the activation signal, for example, a first operation that generates (ON) an induction magnetic field and a second operation that does not generate (OFF), At least two types of operations are performed. Then, when one of the paired interrogators synchronizes with each other and the one performs the first operation, the other performs the second operation.

  Therefore, even if it uses a cheap and easy-to-use radio wave type, it is possible to eliminate interference between the interrogators installed on both sides of the area. In addition, the passing direction can be accurately detected. As a result, the interrogators can be arranged close to each other, and construction problems such as wiring can be reduced.

  It should be noted that multiple sets of interrogators may be provided on one side of the wall, such as wide doors (entrances), in which case all interrogators may operate reciprocally or on a diagonal line, etc. Remote interrogators may operate in phase. Three or more operation states may be set including an operation that generates an intermediate level induction magnetic field.

Further, for realizing a pre-Symbol reciprocal operation, rather than the inside out simple ON / OFF operation, a first transmission power is full power for example, then a second transmission power is low level weak power of only α Since the response signal on one side of the wall is the flip side, the activation signal from the interrogator on the other side becomes noise, and a substantially non-detection area is provided between the interrogators on both sides. And can separate areas. Since the areas are separated, the passing direction can be accurately detected depending on which interrogator's identification information is returned earlier by the response signal from the responder.

Furthermore, e Bei level adjustment means capable of adjusting the second transmission power even without small, the distance between the interrogator installation environment such as the height of the wall pushed out between them, the noise to the desired The second transmission power can be adjusted in accordance with the level of the second transmission power or the desired second transmission power level, etc., so that it can be adapted to the installation environment and the desired responsiveness.

Moreover, the level adjusting means, detects the receiver for maintenance for receiving the activation signal, the level difference between the start signal by both the interrogator which is received by the receiver for the maintenance of the desired D / U Calculation means for obtaining respective second transmission powers capable of obtaining a ratio, and transmission for setting the second transmission power obtained by the calculation means to each interrogator by the second wireless communication method when configured and means, by the receiver for maintenance, it detects the level of the activation signal by the responder position in the actual installation environment, from the result, the second transmission power calculation means is adapted performed so, it is possible to adapt the response to the installation environment and the desired, set by the second transmission power, the transmission means transmits to the interrogator in the second wireless communication scheme determining In, it can be adapted in a very simple adjustment work after installation.

Alternatively , the level adjusting means is provided in each interrogator and receives a start signal from another interrogator, and detects the level of the start signal received by the receiver to obtain a desired D / U If sending a calculating means for calculating a second transmission power obtained ratios, the second transmission power obtained by said calculation means to the other interrogator, and constitute a transmitting unit configured to set, In the level adjustment, the receiver actually detects the level of the activation signal from the other interrogator, and from the result, the second transmission power applied by the calculation means is obtained, and the transmission means determines it as the other interrogator. Therefore , it is possible to adapt to the installation environment and desired responsiveness, and to adapt by automatic adjustment after installation. The transmission of the second transmission power to the other interrogator may be performed by the second wireless communication method, or the other interrogator is connected via an upper management device to which each interrogator is connected. You may make it transmit to a device.

  Furthermore, in the passage management system of the present invention, each interrogator is connected by wire, and one of them is a master, the remaining is a slave, and the slave side synchronizes with the timing on the master side. It is characterized by realizing.

  According to said structure, reciprocal operations, such as said ON / OFF, can be performed by wire-connecting each interrogator.

  In the passage management system of the present invention, the interrogator receives an activation signal from another interrogator, and transmits an activation signal from itself when the reception power is equal to or lower than a predetermined level. The reciprocal operation is realized.

  According to the above configuration, the reciprocal operation such as ON / OFF is performed by looking at the state of the activation signal from the other interrogator. Therefore, there is no need to connect signal lines for synchronization.

  Furthermore, in the passage management system of the present invention, each interrogator transmits a completion message indicating that transmission of the activation signal from itself ends at the end of the activation signal, and the other interrogators When the completion message is received, the reciprocal operation is realized by starting transmission of its own activation signal.

  According to the above configuration, the reciprocal operation such as ON / OFF is performed by looking at the state of the activation signal from the other interrogator.

  Therefore, there is no need to connect signal lines for synchronization. In addition, synchronization can be performed without malfunction even in an environment where there is a lot of noise in the LF band.

  Moreover, in the passage management system of the present invention, each of the interrogators transmits a completion message indicating that transmission of the activation signal from itself ends, in the second wireless communication method, and the other interrogators When the completion message is received, the reciprocal operation is realized by starting transmission of its own activation signal.

  According to the above configuration, the reciprocal operation such as ON / OFF is performed by checking the state of the completion message from the other interrogator.

  Therefore, there is no need to connect signal lines for synchronization. In addition, synchronization can be performed without malfunction even in an environment where there is a lot of noise in the UHF band.

  Furthermore, in the passage management system of the present invention, each interrogator has a clock individually, and a reset signal that resets the clock at predetermined intervals from the master interrogator to the slave interrogator. By transmitting this, the synchronization is realized.

  According to the above configuration, synchronization for realizing the reciprocal operation is performed by a clock provided in each interrogator, and the deviation of the clock is detected from the interrogator on the master side connected to the wired side by the interrogator on the slave side. A reset signal is transmitted at a predetermined period to be calibrated with the reset signal.

  Therefore, compared with the case where the clock itself is transmitted from the interrogator on the master side to the interrogator on the slave side, the signal for obtaining the synchronization can be simplified.

  In the passage management system of the present invention, the interrogator includes a control circuit that generates an activation signal, and superimposes the activation signal on a signal component of an induced magnetic field to the responder in the first wireless communication method. An LF band transmission circuit and an LF antenna for transmission, and an RF antenna and an RF reception circuit for receiving the response signal from the transponder and supplying the response signal to the control circuit, the transponder from the interrogator An LF antenna and an LF band receiving circuit that receive the activation signal, a built-in battery, a control circuit that is activated by the received activation signal and generates a response signal that includes preset unique identification information, and An RF transmission circuit and an RF antenna for returning the response signal to the interrogator by the second wireless communication method using an internal battery as a power source are included.

  According to the above configuration, the interrogator activates the responder with the electromotive force of the LF band (long wave band: 30 to 300 kHz), and the control circuit on the responder side uses the built-in battery as the power source for the RF transmission circuit. A response signal in the UHF band (ultra-high frequency band: 300 MHz to 3 GHz) is returned. In this way, the above-described passage management system using both the LF band and the UHF band can be realized. Even if the power consumption of the RF transmission circuit in the UHF band is as large as 10 to 20 mA, the LF band reception circuit in the LF band starts up with a weak power of several μA, so that the RF transmission circuit is not used in the standby state. In addition, while realizing communication over a relatively long distance, the power consumption of the built-in battery can be suppressed and the life of the responder can be extended.

  As described above, in the passage management system of the present invention, the interrogator gives an LF band activation signal including identification information (ID) set individually to the coil in advance to generate an induced magnetic field. It transmits to a responder by a wireless communication system, the responder receives the induced magnetic field by a coil and is activated by its electromotive force, and the UHF band signal which is the second wireless communication system is used to identify the interrogator. In addition, a response signal including identification information (ID) set individually in advance is returned, and the interrogator receives the response signal so that the interrogator passes from one side of the area to the other side. In the passage management system using both the LF band and the UHF band that detects the responder, the interrogator transmits the activation signal in a reciprocal operation.

  Therefore, even if a cheap and easy-to-use radio wave type is used, interference between the interrogators installed on both sides of the area can be eliminated. In addition, the passing direction can be accurately detected. As a result, they can be arranged close to each other, and construction problems such as wiring routing can be reduced.

Further, for realizing a pre-Symbol reciprocal operation, rather than the inside out simple ON / OFF operation, a first transmission power is full power for example, then a second transmission power is low level weak power of only α Therefore , the response signal on one side of the area will cause the activation signal from the interrogator on the other side to become noise and provide a substantially non-detection area between the interrogators on both sides. And can separate areas. Since the areas are separated, the passing direction can be accurately detected depending on which interrogator's identification information is returned earlier by the response signal from the responder.

Furthermore, by the level adjusting means, the level of the noise Installation environment, the desired, or depending on the level of the second transmission power to be desired, since it can adjust the transmit power of the second, It can be adapted to the installation environment and desired responsiveness.

In addition , the level adjusting means detects a level difference between the activation signal received by the maintenance receiver that receives the activation signal and the interrogator received by the maintenance receiver, and obtains a desired D / U. Calculation means for obtaining respective second transmission powers capable of obtaining a ratio, and transmission for setting the second transmission power obtained by the calculation means to each interrogator by the second wireless communication method by configuring the means, it is possible to adapt the response to the installation environment and desired. Further, since the second transmission power is set by the transmission means transmitting to each interrogator by the second wireless communication method, it can be adapted by an extremely simple adjustment operation after installation.

Alternatively , the level adjusting means are provided to each other, and the level adjustment is performed by the receiver actually detecting the level of the activation signal from the other interrogator, and from the result, the second transmission power applied by the calculating means is obtained. determined, by performing by the transmitting means transmits it to the other interrogator, it is possible to adapt the response to the installation environment and the desired, can be adapted by the automatic adjustment after installation.

  Furthermore, in the passage management system of the present invention, as described above, each interrogator is connected by wire, and any one becomes a master, the remainder becomes a slave, and the slave side synchronizes with the timing on the master side. Realize reciprocal operation.

  Therefore, the reciprocal operation such as ON / OFF can be performed by wire connection between the interrogators.

  In the passage management system of the present invention, as described above, the interrogator receives an activation signal from another interrogator, and when the received power is below a predetermined level, the interrogator receives an activation signal from itself. The reciprocal operation is realized by transmitting.

  Therefore, the reciprocal operation such as ON / OFF is performed by looking at the state of the activation signal from another interrogator, and there is no need to connect a signal line for synchronization.

  Furthermore, in the passage management system of the present invention, as described above, each interrogator transmits a completion message indicating that transmission of the activation signal from itself ends at the end of the activation signal. When the interrogator receives the completion message, the interrogator starts transmission of its own activation signal, thereby realizing the reciprocal operation.

  Therefore, the reciprocal operation such as ON / OFF is performed by looking at the state of the activation signal from another interrogator, and there is no need to connect a signal line for synchronization. In addition, synchronization can be performed without malfunction even in an environment where there is a lot of noise in the LF band.

  In the passage management system of the present invention, as described above, each of the interrogators transmits a completion message indicating that the transmission of the activation signal from itself has ended by the second wireless communication method, When the interrogator receives the completion message, it starts transmitting its activation signal.

  Therefore, the reciprocal operation such as ON / OFF is performed by checking the state of the completion message from another interrogator, and there is no need to connect a signal line for synchronization. In addition, synchronization can be performed without malfunction even in an environment where there is a lot of noise in the UHF band.

  Furthermore, as described above, the passage management system according to the present invention is configured such that synchronization for realizing the reciprocal operation is obtained by the clock provided in each interrogator, and the deviation of the clock is interrogated on the master side connected by wire. A reset signal is transmitted from the tester to the interrogator on the slave side every predetermined period to calibrate.

  Therefore, compared with the case where the clock itself is transmitted from the interrogator on the master side to the interrogator on the slave side, the signal for achieving the synchronization can be simplified.

  In the passage management system of the present invention, as described above, the interrogator includes a control circuit that generates an activation signal and the first wireless communication method by superimposing the activation signal on a signal component of an induced magnetic field. An LF band transmitting circuit and an LF antenna for transmitting to the responder, and an RF antenna and an RF receiving circuit for receiving the response signal from the responder and supplying the response signal to the control circuit, An LF antenna and an LF band receiving circuit for receiving an activation signal from the device, a built-in battery, and a control circuit that is activated by the received activation signal and generates a response signal including unique identification information set in advance And an RF transmission circuit and an RF antenna that use the built-in battery as a power source and return the response signal to the interrogator in the second wireless communication method.

  Therefore, by not using the RF transmission circuit in the standby state, the LF band, UHF, which can reduce the power consumption of the built-in battery and extend the life of the responder while realizing a relatively long distance communication. It is possible to realize a band management system combined with a belt.

[Embodiment 1]
FIG. 1 is a block diagram showing an electrical configuration of the passage management system according to the first embodiment of the present invention. This passage management system is composed of two interrogators 31 and 32 installed on the inside and outside of the room 3 with the wall 1 in FIG. The interrogators 31 and 32 send a start signal including unique identification information (ID) set in advance to the first wireless communication system (LF). ), The responder 16 is activated in response to the activation signal, and a response signal including unique identification information (ID) preset in itself is transmitted to the second wireless communication system (UHF). The interrogator 31, 32 is a passage management system using both the LF band and the UHF band for detecting the responder 16 passing from one side to the other side across the wall 1 by replying with. The detection results are totaled by the management device 10 as shown in FIG. 16 and used for the entrance / exit management of the room 3 and the inventory management of goods as described above. The responder 16 is the same as the responder 16 shown in FIG. 17, and the interrogators 31 and 32 are similar to the interrogator 14 shown in FIG. 17, and the corresponding parts are denoted by the same reference numerals. The description is omitted.

  It should be noted that in the interrogators 31 and 32, one of the control circuits 41 and 42 that generates an activation signal, receives a response signal, and generates an ACK signal (interrogator 31 in the example of FIG. 1). The master (the interrogator 32 in the example of FIG. 1) becomes the slave, and the clock signal generated by the clock generator 43 on the master side is used by the control circuit 41 on the master side and inverted by the inverter 44. As shown in FIG. 2, the control circuit 41 and the control circuit 42 synchronize the transmission timing of the start signal with each other, as shown in FIG. This is to perform a reciprocal operation between ON / OFF and OFF / ON. For example, the ON / OFF cycle is 100 msec, and the ON period is 50 msec.

  Accordingly, each interrogator 31, 32 periodically generates the start signal, and is synchronized with each other so that the start signal of the other interrogator 32, 31 is not generated (OFF: second operation) period. In addition, it will generate its own start signal (ON: first operation), and even if it uses a cheap and easy-to-use radio wave type, it will be between the interrogators 31 and 32 installed on both sides of the wall 1 respectively. Interference can be eliminated. In addition, the passing direction can be accurately detected. As a result, they can be arranged close to each other, and construction problems such as wiring routing can be reduced.

  It should be noted that a plurality of interrogators may be provided on one side of the wall 1 because the width of the door 9 (entrance / exit) is wide, in which case all the interrogators may operate in a reciprocal manner, or diagonal lines The distant interrogators may operate in phase. Three or more operation states may be set including an operation that generates an intermediate level induction magnetic field.

[Embodiment 2]
FIG. 3 is a block diagram showing an electrical configuration of the passage management system according to the second embodiment of the present invention. This passage management system is similar to the passage management system shown in FIG. 1 described above, and corresponding portions are denoted by the same reference numerals and description thereof is omitted. In FIG. 3 and other embodiments thereafter, the responder 16 is not shown for the sake of simplicity. It should be noted that in this embodiment, the LF band transmission circuit 12a of each interrogator 31a, 32a includes an output control unit 45, and responds to the clock signal (synchronization signal) as shown in FIG. Then, the full power Pon as the first transmission power determined in advance and the weak power having a level lower by α, for example, 12 dB from the predetermined second transmission power are periodically repeated, and the reciprocal operation is performed. That is.

  For this reason, the control circuits 41a and 42a continuously generate start signals in response to the clock signal (synchronization signal) (although it takes timing). The clock signal generated by the clock generator 43 and the synchronization signal inverted by the inverter 44 are respectively input to the output control units 45 of the interrogators 31a and 32a. The LF band transmission circuit 12a includes, for example, a modulation circuit that superimposes the activation signal from the control circuits 41a and 42a on the signal component of the induction magnetic field, and a gain variable power amplifier that amplifies the output and supplies the amplified signal to the LF antenna 13. By switching the gain of the amplifier by the output control unit 45, the transmission power can be switched as shown in FIG.

  5 to 7 are diagrams for explaining the effect of gain switching of the amplifier. FIG. 5 is a plan view schematically showing the target area of the authentication area 17 at the installation position of the LF antenna 13 which the present inventor has experimented. The LF antenna 13 is installed on the ceiling, and as shown in FIG. 5, the LF antenna 13 is installed 0.5 m away from the door 9 (wall 1) and on the center position in the width direction of the door 9. The target area of the authentication area 17 is 2 m wide and 1 m from the LF antenna 13 on the side opposite to the door 9 (wall 1).

  FIG. 6 shows the bit error rate distribution when the experimenter who is the user 2 passes the door 9 with the card-like responder 16 horizontal, and the bit error when the user passes vertically. The rate distribution is shown in FIG. 6 (a) and 7 (a) show the bit error rate when only one of the two interrogators 31a and 32a is operated, that is, when the start signal is transmitted at the full power Pon. FIGS. 6 (b) and 7 (b) show the distribution in which the two interrogators 31a and 32a periodically repeat the full power Pon and the weak power level lower by α. The bit error rate distribution when reciprocal operation is performed is shown.

  6A and 7A, when only one of the interrogators 31a and 32a is operating, whether the card-like responder 16 is horizontal or vertical, a bit is used. It is understood that there is no significant difference in the error rate distribution, and that the authentication area 17 has entered the opposite side of the wall 1. On the other hand, when the two interrogators 31a and 32a are caused to perform the reciprocal operation with the full power Pon and the weak power of a level lower by α, the door 9 (wall 1) of the LF antenna 13 Although the distribution on the opposite side is not much different from the case of the single operation in FIGS. 6A and 7A, the bit error rate is high on the door 9 (wall 1) side. It is understood that both sides are higher.

  Therefore, in realizing the reciprocal operation, the full power Pon as shown in FIG. 4 and the weak power at a level lower by α are then switched instead of turning over the simple ON / OFF operation as shown in FIG. Thus, with respect to the responder 16 on one side of the wall 1, the activation signal from the interrogator (for example, 32a) on the other side becomes noise, and is substantially non-interposed between the interrogators 31a and 32a on both sides. A detection area can be provided and the authentication area 17 can be separated. Since the authentication area 17 is separated, the passing direction can be accurately detected depending on which interrogator's identification information has been returned earlier by the response signal from the responder 16. Further, the interrogator (32a) on the other side is made to respond to the other side by making the second transmission power as large as possible without causing the interference, that is, by reducing the level α. The activation signal can be continuously given to the device 16, and the responsiveness can be improved.

  The level α [dB] can be sufficiently received by the responder 16 in the authentication area 17 of both interrogators 31a and 32a, and the authentication area 17 in the center (position of the door 9) between the interrogators 31a and 32a. Is set to a D (desired wave) / U (interfering wave) ratio.

[Embodiment 3]
FIG. 8 is a block diagram showing an electrical configuration of the passage management system according to the third embodiment of the present invention. This passage management system is similar to the passage management system shown in FIG. 3 described above. Corresponding portions are denoted by the same reference numerals and description thereof is omitted. It should be noted that in the present embodiment, the output control unit 45b in the LF band transmission circuit 12b of each of the interrogators 31b and 32b can adjust the level α by a setting switch 46 that is a level adjusting means. That is.

  Accordingly, the installation environment such as the distance between the interrogators 31b and 32b, the height of the wall 1 protruding between them, the desired noise level (D / U ratio), or the desired second transmission power. The second transmission power (Pon- [alpha] [dB]) can be adjusted after the installation work according to the level, etc., and can be adapted to the installation environment and desired responsiveness. Preferably, the first transmission power (full power Pon level) may be adjustable.

[Embodiment 4]
FIG. 9 is a block diagram showing an electrical configuration of the passage management system according to the fourth embodiment of the present invention. This passage management system is similar to the passage management system shown in FIG. 8 described above, and corresponding portions are denoted by the same reference numerals and description thereof is omitted. It should be noted that in this embodiment, the LF band transmission circuit 12c of each of the interrogators 31c and 32c can be level-adjusted by the output control unit 45c, and the level adjustment is performed for construction that is a level adjustment means. This is performed by the terminal 50.

The construction terminal 50 includes an LF antenna 51, an LF band reception circuit 52, a control circuit 53, an RF transmission circuit 54, and an RF antenna 55. The LF antenna 51 and the LF band receiving circuit 52 serve as a maintenance receiver that receives the activation signal, and the control circuit 53 that is a calculation means receives the levels of the activation signals received by the interrogators 31c and 32c. The difference α is detected, the respective levels α at which a desired D / U ratio can be obtained are obtained, and transmitted to the interrogators 31c and 32c via the RF transmission circuit 54 and the RF antenna 55 serving as transmission means. Specifically, when the second transmission power (transmission output at the OFF timing (Pon-α [dB])) of the start signal from each interrogator 31c, 32c is measured as Pra, Prb, the interrogator To 31c
αa = D / U− (Pra−Prb) (1)
To the interrogator 32c,
αb = D / U− (Prb−Pra) (2)
Is transmitted as a setting signal.

  In each interrogator 31c, 32c, the levels αa, αb are received by the control circuits 41c, 42c from the RF antenna 20 via the RF transmission / reception circuit 15, and transmitted to the output control unit 45c at the OFF timing. Set as α [dB].

  Therefore, since the construction terminal 50 detects the level of the activation signal at the position of the responder 16 in the actual installation environment, the control circuit 53 obtains the second transmission power or the level α adapted from the result. It is possible to adapt to the installation environment and desired responsiveness. Further, since the level α is set by transmitting to the interrogators 31c and 32c by the second wireless communication method (UHF) via the RF transmission circuit 54 and the RF antenna 55, it is extremely It can be adapted with simple adjustment work.

[Embodiment 5]
FIG. 10 is a block diagram showing an electrical configuration of the passage management system according to the fifth embodiment of the present invention. This passage management system is similar to the passage management system shown in FIG. 9 described above, and corresponding portions are denoted by the same reference numerals and description thereof is omitted. It should be noted that in the present embodiment, each of the interrogators 31d and 32d is provided with an LF antenna 61 and an LF band receiving circuit 62 that are receivers that receive the activation signals from the other interrogators 32d and 31d. Through these, the control circuits 41d and 42d serving as computing means mutually monitor the levels Pra and Prb at the OFF timing of the activation signal, and the levels αa and αb obtained from the equations 1 and 2 above. Is set in the interrogators 32d and 31d of the other party via the RF transmission / reception circuit 15 from the RF antenna 20 serving as a transmission means.

  By comprising in this way, without using the above-mentioned construction terminal 50, each interrogator 31d and 32d can set the transmission output at the time of OFF independently.

  The transmission of the levels αa and αb may be performed not via the RF antenna 20 and the RF transmission / reception circuit 15 but via the upper management device 10 or the like. The slave-side interrogator 32d transmits the reception level Pra to the master-side interrogator 31d, and the master-side control circuit 41d calculates and sets the levels αa and αb of both the interrogators 31d and 32d. You may do it.

[Embodiment 6]
FIG. 11 is a block diagram showing an electrical configuration of the passage management system according to the sixth embodiment of the present invention. This passage management system is similar to the passage management system shown in FIG. 1 described above, and corresponding portions are denoted by the same reference numerals and description thereof is omitted. It should be noted that in this embodiment, each of the interrogators 31e and 32e includes a clock generator 43, which allows the clock signal to self-run, and the control circuits 41e and 42e perform ON / OFF operation of the start signal. Is monitored by the interrogators 32e and 31e of the other party received by the LF antenna 61 and the LF band receiving circuit 62, and the start signal of the own device is turned on after the carrier is turned off.

  With this configuration, the synchronization signal line 49 can be eliminated. In place of the LF band transmission circuit 12, the transmission power at the OFF timing may not be set to 0 by using the LF band transmission circuit 12a or the like whose transmission power is variable.

[Embodiment 7]
FIG. 12 is a block diagram showing an electrical configuration of the passage management system according to the seventh embodiment of the present invention. This passage management system is similar to the passage management system shown in FIG. 11, and the configuration of the transmission / reception circuit is particularly the same. It should be noted that in this embodiment, the control circuits 41f and 42f of the interrogators 31f and 32f complete their transmission (switching from ON to OFF) during the start signal of their own devices. , Including a transmission completion message. In the other interrogators 32f and 31f, when the transmission completion message in the activation signal is received by the LF antenna 61 and the LF band reception circuit 62, the control circuits 42f and 41f turn on the activation signal of the own device. .

  Thus, the reciprocal operation such as ON / OFF is performed by looking at the state of the activation signal from another interrogator, so that the signal line 49 for synchronization can be made unnecessary. In addition, synchronization can be performed without malfunction even in an environment where there is a lot of noise in the LF band.

[Embodiment 8]
FIG. 13 is a block diagram showing an electrical configuration of the passage management system according to the eighth embodiment of the present invention. This passage management system is similar to the passage management system shown in FIG. It should be noted that in the present embodiment, the control circuits 41g and 42g of the interrogators 31g and 32g complete the transmission during the transmission of the start signal of the own machine (switching from ON to OFF). Before, a transmission completion message is transmitted from the RF transmission / reception circuit 15 via the RF antenna 20 by the second wireless communication method (UHF). In the interrogators 32g and 31g of the other party, when the transmission completion message is received by the RF antenna 20 and the RF transmission / reception circuit 15, the control circuits 42g and 41g turn ON the activation signal of the own device.

  Thus, the reciprocal operation such as ON / OFF is performed by looking at the state of the completion message from another interrogator, so that the signal line 49 for synchronization can be made unnecessary. In addition, synchronization can be performed without malfunction even in an environment where there is a lot of noise in the UHF band.

[Embodiment 9]
FIG. 14 is a block diagram showing an electrical configuration of the passage management system according to the ninth embodiment of the present invention. This passage management system is similar to the passage management system shown in FIGS. It should be noted that in the present embodiment, each of the interrogators 31h and 32h includes a clock generator 43 that independently runs, and is connected by a signal line 49 from the control circuit 41h of the interrogator 31h on the master side. The reset signal for resetting the clock is transmitted to the control circuit 42h of the interrogator 32h on the slave side. That is, the clock generator 43 provided in each of the interrogators 31h and 32h is synchronized to realize the reciprocal operation, and the shift of the clock is calibrated with the reset signal.

  Therefore, compared with the case where the clock itself is transmitted from the interrogator 31h on the master side to the interrogator 32h on the slave side, the signal for obtaining the synchronization can be simplified. This is particularly advantageous when a signal other than the reset signal is transmitted to the signal line 49. Further, the master-side control circuit 41h may monitor the activation signal from the slave-side interrogator 32h and transmit the reset signal only when the transmission timing is shifted by a predetermined time or more. Furthermore, the reset signal may be transmitted not using the signal line 49 but using the RF transceiver circuit 15 and the RF antenna 20, the LF band transmission circuit 12 and the LF antenna 13, and the like. Good.

1 is a block diagram showing an electrical configuration of a passage management system according to a first embodiment of the present invention. It is a wave form diagram for demonstrating operation | movement of the passage management system shown in FIG. It is a block diagram which shows the electric constitution of the passage management system which concerns on the 2nd Embodiment of this invention. It is a wave form diagram for demonstrating operation | movement of the passage management system shown in FIG. FIG. 4 is a diagram for explaining an effect of gain switching of an amplifier in the passage management system shown in FIG. 3, and is a plan view schematically showing a target area of an authentication area at an installation position of an LF antenna. It is a figure for demonstrating the effect by the gain switching of the amplifier in the passage management system shown in FIG. 3, and is a figure which shows distribution of the bit error rate at the time of passing a door with a card-like transponder horizontal. It is a figure for demonstrating the effect by the gain switching of the amplifier in the passage management system shown in FIG. 3, and is a figure which shows distribution of the bit error rate at the time of passing through the said card-like responder vertically. It is a block diagram which shows the electric constitution of the passage management system which concerns on the 3rd Embodiment of this invention. It is a block diagram which shows the electric constitution of the passage management system which concerns on the 4th Embodiment of this invention. It is a block diagram which shows the electric constitution of the passage management system which concerns on the 5th Embodiment of this invention. It is a block diagram which shows the electric constitution of the passage management system which concerns on the 6th Embodiment of this invention. It is a block diagram which shows the electric constitution of the passage management system which concerns on the 7th Embodiment of this invention. It is a block diagram which shows the electric constitution of the passage management system which concerns on the 8th Embodiment of this invention. It is a block diagram which shows the electric constitution of the passage management system which concerns on the 9th Embodiment of this invention. It is a figure for demonstrating the passage management system by a prior art. It is a figure for demonstrating the passage management system by another prior art. It is a block diagram which shows the electrical structure of the prior art shown in FIG.

1 Wall 2 User 3 Room 9 Door 10 Management Device 12, 12a, 12b, 12c LF Band Transmission Circuit 13, 21, 51, 61 LF Antenna 16 Transponder 17 Authentication Area 18 Display Unit 19 Buzzer 20, 25, 55 RF Antenna 22 , 52, 62 LF band receiving circuit 23, 53 Control circuit 24, 54 RF transceiver circuit 31, 31a-31h, 32, 32a-32h Interrogator 41, 41a, 41c-41h, 42, 42a, 42c-42h Control circuit 43 Clock generator 44 Inverter 45, 45b, 45c Output control unit 46 Setting switch 49 Signal line 50 Construction terminal

Claims (8)

A pair of interrogators and one or more responders, wherein the interrogator transmits an activation signal including its own identification information in a first wireless communication method, The interrogator is activated in response to the activation signal, and returns a response signal including its own identification information in the second wireless communication system, so that the interrogator passes the responder from one side of the area to the other side. In the passage management system to detect,
The transmission power of the activation signal is set with a predetermined first transmission power and a predetermined second transmission power smaller than the first transmission power, and one of the pair of interrogators. when the interrogator transmits at the first transmission power, by other interrogators transmit at the second transmission power, interrogator said pair is to transmit the activation signal in reciprocal operation Is composed of
Level adjustment means capable of adjusting at least the second transmission power, the level adjustment means comprising:
A maintenance receiver for receiving the activation signal;
Calculation for detecting respective second transmission powers by detecting a difference in level of the activation signal received by the interrogators received by the maintenance receiver and obtaining a desired D (desired wave) / U (interfering wave) ratio. Means,
A passage management system comprising: a transmission unit configured to transmit and set the second transmission power obtained by the computing unit to each interrogator using the second wireless communication method . A pair of interrogators and one or more responders, wherein the interrogator transmits an activation signal including its own identification information in a first wireless communication method, The interrogator is activated in response to the activation signal, and returns a response signal including its own identification information in the second wireless communication system, so that the interrogator passes the responder from one side of the area to the other side. In the passage management system to detect,
The transmission power of the activation signal is set with a predetermined first transmission power and a predetermined second transmission power smaller than the first transmission power, and one of the pair of interrogators. When the other interrogator transmits with the second transmission power when the other interrogator transmits with the first transmission power, the paired interrogators transmit the activation signal with a reciprocal operation. Is composed of
Level adjustment means capable of adjusting at least the second transmission power, the level adjustment means being provided in each interrogator,
A receiver that receives activation signals from other interrogators;
Arithmetic means for detecting a level of the activation signal received by the receiver and obtaining a second transmission power capable of obtaining a desired D (desired wave) / U (interference wave) ratio;
A passage management system comprising: a transmission unit configured to transmit and set the second transmission power obtained by the calculation unit to the other interrogator. The interrogators are connected by wire, and one of them is a master, the remaining is a slave, and the reciprocal operation is realized by synchronizing the slave side with the master side timing. Or the passage management system according to 2 . The interrogator receives the activation signal from another interrogator, and realizes the reciprocal operation by transmitting the activation signal from itself when the reception power is below a predetermined level. The passage management system according to claim 1 or 2 . Each of the interrogators transmits a completion message indicating that transmission of the activation signal from itself ends at the end of the activation signal, and when the other interrogators receive the completion message, by initiating the transmission, passing management system according to claim 1 or 2, wherein the realizing the reciprocal operation. Each of the interrogators transmits a completion message indicating that transmission of the activation signal from itself has ended in the second wireless communication method, and when the other interrogators receive the completion message, 3. The passage management system according to claim 1, wherein the reciprocal operation is realized by starting transmission of a signal. Each interrogator has a clock individually, and the synchronization is realized by transmitting a reset signal for resetting the clock at predetermined intervals from the interrogator on the master side to the interrogator on the slave side. The passage management system according to claim 3 . The interrogator is
A control circuit for generating a start signal;
An LF band transmission circuit and an LF antenna for superimposing the activation signal on a signal component of an induction magnetic field and transmitting the signal to the responder in the first wireless communication method;
An RF antenna and an RF receiving circuit configured to receive the response signal from the responder and apply the response signal to the control circuit;
The responder is
An LF antenna and an LF band receiving circuit for receiving an activation signal from the interrogator;
Built-in battery,
A control circuit that is activated by the received activation signal and generates a response signal that includes preset unique identification information;
As a power supply of the built-in battery, claim 1-7, characterized in that it comprises a RF transmitter circuit and the RF antenna to reply to the interrogator the response signal at the second wireless communication system 1 The passage management system according to item.

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