JP5464485B2 - Traffic management system - Google Patents

Description

  The present invention relates to a traffic management system.

  Conventionally, an entrance management system that permits entry of a specific person has been provided. In this type of system, for example, on the premise that a person who enters the room has a medium equipped with a wireless tag, a wireless tag reader capable of reading the wireless tag is installed near the entrance of the room. When a person approaches the vicinity of the doorway, the wireless tag held by the approaching person is read by the wireless tag reader, and if the person is a legitimate wireless tag (for example, a wireless tag having an allowed ID), the approaching person is identified. Judged as an entry / exit permit.

JP 2008-40828 A

  By the way, in the entrance management system as described above, when a regular passer-by enters the detection area, the entry is appropriately grasped, and a passer-by existing in the detection area (specifically, the passer-by has Authentication target medium such as a wireless tag) is required to properly authenticate without spilling. For that purpose, it is required to approach the detection area to be read by the passerby (that is, near the entrance / exit) and appropriately grasp that it is present in the detection area and appropriately deal with it.

  For example, in the case of a traffic management system that presupposes that a person to enter the room possesses a wireless tag, as a method of reading the wireless tag of the passer-by, after detecting the passer-by, transmit a radio wave for a certain period of time and read it. Such a method can be considered. By using such a method, it is not necessary to output radio waves during a time zone when the passerby is not in the detection area, and it is only necessary to output radio waves for a certain period immediately after the passerby is detected. Effectively. However, when such a communication method is used, reading or entering / exiting processing may not be appropriately performed because of the passage timing of the passer-by, the number of intruders, or the wireless tag holding method. For example, even if you have a legitimate wireless tag, authentication may not be performed within a certain period (radio wave output period) after entering the detection area due to poor communication, etc. Even when waiting in the area, a situation may occur in which authentication cannot be performed immediately. In addition to the example in which the person to enter the room holds the wireless tag as described above, in other examples, it is possible to appropriately grasp that the passerby has approached the detection area, and the authentication target medium possessed by the passerby. It is required to perform the certification of

  The present invention has been made to solve the above-described problems, and can appropriately grasp that a passer-by has approached the detection area, and can satisfactorily authenticate an authentication target medium possessed by the passer-by. The purpose is to provide a traffic management system that can be used.

The invention of claim 1 is a traffic management system for managing traffic at an entrance and exit, wherein a passer-by detection means for detecting a passer-by existing in a monitoring range, and when the passer-by is detected by the passer-by detection means A carrier output means for outputting a carrier via an antenna, a radio tag possessed by the passer-by and outputting a command when the carrier is received from the carrier output means, and output from the radio tag Receiving means for receiving the command;
When the command is received by the receiving means, the wireless tag reading means for reading the unique ID recorded in the wireless tag and the unique ID read by the wireless tag reading means are allowed to pass through the entrance / exit. An ID discriminating unit that discriminates whether or not the ID is permitted, and the entrance and exit can be switched between a locked state and an unlocked state, and the ID discriminating unit determines that the unique ID is the permission ID. Locking means for switching the doorway to the unlocked state, and the carrier output means continues output of the carrier during a period when the passer-by detection means detects the passer-by. It is said.

According to a second aspect of the present invention, in the traffic management system according to the first aspect, when there are a plurality of the wireless tags in the readable area of the command by the receiving means, the wireless tag possesses at least one of the wireless tags. The carrier output is continued during the period when the passer- by is detected by the passer- by detection means .

  The invention according to claim 3 is the traffic management system according to claim 1 or 2, wherein the readable area of the command by the receiving unit includes the monitoring range of the passer by the passer detection unit, And it is characterized by being a region wider than the monitoring range.

  According to a fourth aspect of the present invention, in the traffic management system according to any one of the first to third aspects, the plurality of antennas are arranged at a predetermined distance in the width direction of the doorway, and the width The passer-by detection means is provided at a position between the plurality of antennas in the direction.

  According to a fifth aspect of the present invention, in the traffic management system according to the fourth aspect, the passer-by detection means is disposed at a central portion in the width direction of the doorway, and one of the antennas is disposed at one end in the width direction of the doorway. The other antenna is disposed on the other end side in the width direction of the doorway, and both the one antenna and the other antenna face the width direction center side and the lower side of the doorway. It is characterized by being arranged in.

  According to a sixth aspect of the present invention, in the traffic management system according to any one of the first to fifth aspects, an installation angle changing means is further provided for changing the installation angle of the antenna by driving the antenna. The installation angle changing means changes the installation angle of the antenna after the carrier output means outputs the carrier.

  In the invention of claim 1, a passer-by detection means for detecting a passer-by existing in the monitoring range, a carrier output means for outputting a carrier via an antenna when the passer-by is detected by the passer-by detection means, When a passer holds a wireless tag that outputs a command when a carrier is received from the carrier output means, a receiving means that receives a command output from the wireless tag, and a command received by the receiving means A wireless tag reading means for reading the unique ID recorded on the wireless tag, an ID determining means for determining whether or not the unique ID read by the wireless tag reading means is a permission ID that is allowed to pass through the doorway, and an entrance / exit Can be switched between a locked state and an unlocked state, and when the unique ID is determined to be a permission ID by the ID determining means, the doorway is set to the unlocked state. Changing and locking means is provided Ri. In this way, it is possible to detect that a passer-by with a wireless tag has entered the monitoring range and output the carrier, so that carrier output is started at an appropriate time (when the passer-by enters the monitoring range). Power saving. Then, it is determined whether or not the unique ID recorded in the wireless tag is a permission ID. When the unique ID is a permission ID (that is, when a passer-by has a legitimate wireless tag), the unlocking operation is appropriately performed. It can be performed. Furthermore, in the present invention, since the output of the carrier is continued while the passer-by detection means detects the passer-by, the reading of the wireless tag is continued while the passer-by exists in the monitoring range. Therefore, it is possible to effectively reduce the reading spill due to the suspension of the carrier output.

In the invention of claim 2, when there are a plurality of wireless tags within the readable area of the command by the receiving means, during a period in which a passerby who owns at least one of the wireless tags is detected by the passer detection means , Carrier output continues. In this way, even if the authentication of any one of the wireless tags is completed in a situation where a plurality of wireless tags can be read, the carrier output is maintained as long as the passer- by is detected by the passer- by detection means . Therefore, wireless tags other than the wireless tag for which authentication has been completed can be reliably authenticated.

  According to a third aspect of the present invention, the area where the command can be read by the receiving means includes the monitoring range of the passerby by the passer detection means and is wider than the monitoring range. In this way, the wireless tag is easily maintained in the readable area immediately after the passerby is detected and the wireless tag is read, and the wireless tag is quickly and satisfactorily read immediately after the passer is detected. Can do.

  In the invention of claim 4, a plurality of antennas are arranged at a predetermined distance in the width direction of the entrance and exit, and a passer-by detection means is provided at a position between the plurality of antennas in the width direction. If it does in this way, it will become easy to cover the width direction outer side of a passer-by detection means with an antenna, and after a passerby is detected by a passer-by detection means, it will become difficult to remove a wireless tag from a readable field in the width direction. Therefore, for example, the wireless tag can be read more favorably in an environment where a passerby can move in the width direction.

  According to a fifth aspect of the present invention, the passer-by detection means is disposed at a central portion in the width direction of the doorway, one antenna is disposed at one end side in the width direction of the doorway, and the other antenna is disposed at the other widthwise end portion side of the doorway. Are arranged, and both the one antenna and the other antenna are arranged in a form facing the center side in the width direction of the entrance and the lower side. In this way, the vicinity of the central portion in the width direction of the entrance / exit where the passer detection means is arranged can be preferentially covered by the antennas on both sides, and the detection leakage (reading) in the vicinity of the central portion in the width direction where the passer-by can pass most easily. Spills) can be effectively suppressed.

  The invention according to claim 6 is provided with an installation angle changing means for driving the antenna to change the installation angle of the antenna, and the installation angle changing means is arranged so that the antenna installation angle is output after the carrier output means outputs the carrier. Is configured to change. In this way, even if the angle of the antenna is not appropriate at the start of carrier output, the antenna is easily driven after the carrier is output and installed at an appropriate angle, and thus the RFID tag is easily read well. .

FIG. 1 is an explanatory diagram schematically illustrating a traffic management system according to the first embodiment of the present invention. FIG. 2 is an explanatory diagram of the configuration of the outside of the entrance in the traffic management system of the first embodiment as seen from the front side of the outside of the entrance. FIG. 3 is a block diagram illustrating an electrical configuration of the traffic management system according to the first embodiment. FIG. 4A is a block diagram illustrating an electrical configuration of a portion that functions as a wireless tag reader in the traffic management system according to the first embodiment. FIG. 4B is a block diagram illustrating the electrical configuration of the wireless tag. FIG. 5 is a flowchart illustrating the flow of authentication processing performed in the traffic management system according to the first embodiment. FIG. 6 is a timing chart for explaining the relationship between the detection timing by the human sensor and the carrier output timing. FIG. 7 is an explanatory diagram for explaining the relationship between the monitoring range by the human sensor and the communicable area. FIG. 8A is an explanatory diagram for explaining an example of reading failure when a plurality of wireless tags exist in the communication area, and FIG. 8B shows a case where a plurality of wireless tags exist in the communication area. It is explanatory drawing explaining the example of a successful reading. FIG. 9 is an explanatory diagram schematically illustrating a traffic management system according to the second embodiment of the present invention. FIG. 10 is a flowchart illustrating the flow of authentication processing performed in the traffic management system according to the second embodiment. FIG. 11 is an explanatory diagram schematically illustrating a traffic management system according to a reference example . 12 is a cross-sectional view schematically illustrating a laser radar device used in the traffic management system of FIG. FIG. 13 is a flowchart illustrating the flow of detection processing performed in the traffic management system of FIG. FIG. 14 is an explanatory diagram for explaining a traffic management area and a readable area when the laser radar device of FIG. 12 is viewed from above. FIG. 15 is an explanatory diagram schematically illustrating the belongings (tags) to which the information code read by the traffic management system according to the reference example is attached. FIG. 16A is a graph illustrating the relationship between the angle of the deflection unit and the detected distance value when laser scanning is performed by the laser radar apparatus of FIG. FIG. 16B is a graph illustrating the relationship between the angle of the deflecting unit and the amount of received light when an information code existing in the readable range is scanned. FIG. 17 is an explanatory diagram conceptually illustrating the tracking performed in the traffic management system of FIG.

[First embodiment]
Hereinafter, a first embodiment of the traffic management system of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory diagram schematically illustrating a traffic management system according to the first embodiment of the present invention. FIG. 2 is an explanatory diagram of the configuration of the outside of the entrance in the traffic management system of the first embodiment as seen from the front side of the outside of the entrance. FIG. 3 is a block diagram illustrating an electrical configuration of the traffic management system according to the first embodiment. FIG. 4A is a block diagram illustrating an electrical configuration of a portion that functions as a wireless tag reader in the traffic management system according to the first embodiment. FIG. 4B is a block diagram illustrating the electrical configuration of the wireless tag.

(Outline of traffic management system)
The traffic management system 1 shown in FIG. 1 is configured as an entrance / exit management system that manages the entrance / exit of a person into the room 2, for example. As shown in FIGS. 1 and 2, the traffic management system 1 includes a wireless tag 40 held by a passer-by P, an antenna 22 disposed near the upper side of the entrance / exit 3 outside the entrance / exit 3, and the entrance / exit 3. On the outside of the entrance / exit 3, the human sensor 30, the controller 22 electrically connected to the antenna 22 and human sensor 30, the electric lock 7 controlled by the controller 9, and the controller 9 And a management device 50 that is communicably connected.

  The room 2 in which the traffic management system 1 is provided is configured such that the entrance / exit 3 is opened and closed by a door 5, and the door 5 is configured, for example, as a slide type or a rotary type. Electric locks 7 are provided at adjacent positions. As the electric lock 7, for example, an electromagnetic electric lock that locks and unlocks the door 5 by operating an electromagnet inside the electric lock when energized is used.

  For example, the controller 9 is configured as shown in FIG. 3, and includes a control circuit 10, a communication unit 11, a memory 12, a wireless tag communication unit 21, and the like. In the traffic management system 1 according to the present embodiment, the controller 9 and the antenna 22 are configured as a known wireless tag reader.

  The control circuit 10 is composed of a microcomputer, for example, and controls the entire controller 9 according to a control program stored in the memory 12. For example, transmission data to be transmitted to the wireless tag 40 is output from the control circuit 10 to the transmission circuit 21a (FIG. 4A) of the wireless tag communication unit 21 at the time of data transmission, and at the time of data reception. The reception data generated by the reception circuit 21b (FIG. 4A) is input to the control circuit 10.

  The memory 12 is configured by a known storage medium such as a ROM, a RAM, or a nonvolatile memory, and stores various information handled by the controller 9. For example, the above-described control program is stored in the ROM, and the entry history information of passers-by can be stored in the RAM and the non-volatile memory. The communication unit 11 is configured by a known LAN interface, for example, and functions as an interface for performing communication between the controller 9 and the management device 50.

  As shown in FIG. 4A, the wireless tag communication unit 21 includes a transmission circuit 21a, a reception circuit 21b, and the like. The transmission circuit 21a includes, for example, a carrier oscillator, an encoding unit, a modulation unit, an amplifier, and the like. The carrier oscillator outputs a carrier (carrier wave) having a predetermined frequency, and the encoding unit includes a control circuit. The transmission data output from the control circuit 10 is encoded and output to the modulation unit. The modulation unit receives the carrier (carrier wave) from the carrier oscillator and the transmission data from the encoding unit, and encodes the carrier (carrier wave) output from the carrier oscillator when transmitting a command to the communication target. A modulated signal that is ASK (Amplitude Shift Keying) modulated by the encoded transmission code (modulated signal) output from the unit is generated and output to the amplifier. The amplifier amplifies an input signal (a modulated signal modulated by the modulation unit) with a set amplification factor, and the amplified signal is output to the antenna 22 as a transmission signal.

  The antenna 22 is connected to an input terminal of a reception circuit 21b, and a radio wave signal (reception signal) received by the antenna 22 is input to the reception circuit 21b. The reception circuit 21b includes, for example, an amplifier, a demodulation unit, a binarization processing unit, a decoding unit, and the like. The reception signal received by the antenna 22 is amplified by the amplifier, and the amplified signal is amplified by the demodulation unit. Demodulating. Further, the demodulated signal waveform is binarized by the binarization processing unit, decoded by the decoding unit, and the decoded signal is output to the control circuit 10 as received data.

  The wireless tag 40 is configured as a known RFID tag in hardware. As shown in FIG. 4B, the wireless tag 40 includes an antenna 41, a power circuit 42, a demodulation circuit 43, a control circuit 44, a memory 45, a modulation circuit 46, a load modulation circuit 47, and the like. A capacitor 48 is connected to the antenna 41 in parallel. When the wireless tag 40 receives a carrier wave transmitted from the wireless tag transmission unit 21 and the antenna 22 via the antenna 41, the wireless tag 40 rectifies the carrier wave in the power supply circuit 42 to generate an operation power supply, and is configured by a microcomputer. This is supplied to the control circuit 44 and other components.

In the wireless tag 40, transmission data from the antenna 22 superimposed on the carrier wave is demodulated by the demodulation circuit 43 and output to the control circuit 44. When the operation circuit is supplied with power and activated, the control circuit 44 receives transmission data from the reader side (transmission data from the antenna 22) and reads data stored in the memory 45. The modulation circuit 46 modulates a subcarrier obtained by dividing the received carrier by response data output from the control circuit 44. Furthermore, a series circuit of a resistor and a switch constituting the load modulation circuit 47 is connected in parallel to the antenna 41, and the switch of the load modulation circuit 47 is turned on / off by the modulated signal of the subcarrier output from the modulation circuit 46. By doing so, the carrier wave is load-modulated and a response is returned.
4A and 4B, an example of the wireless tag communication unit 21 and the wireless tag 40 illustrated in FIG. 3 is given, but other configurations capable of wireless communication using radio waves as media may be used.

  The human sensor 30 is a sensor that detects a passerby that exists near the entrance 3 and is configured by, for example, an infrared sensor, an ultrasonic sensor, a visible light sensor, or the like. The human sensor 30 is configured to detect the passerby and output a detection signal when the passerby enters the predetermined detection area AR1. A detection signal output from the human sensor 30 is input to the control circuit 10. The human sensor 30 corresponds to an example of a “passerby detection unit” and functions to detect a passerby existing in the detection area AR1 (monitoring range).

  The management device 50 is configured as an information processing device (for example, a known personal computer) provided with a CPU, storage means (ROM, RAM, HDD, etc.), input means (mouse, keyboard, etc.), and the like. Information (for example, traffic history, authentication history, etc.) can be acquired and stored.

(Authentication process)
Next, an authentication process performed in the traffic management system 1 will be described. FIG. 5 is a flowchart illustrating the flow of authentication processing performed in the traffic management system 1 according to the first embodiment. The authentication process shown in FIG. 5 is performed by the control circuit 10 of the controller 9 and is started by, for example, turning on the power, as a trigger. First, it is determined whether the passerby has been detected by the human sensor 30 (S1). If no passerby is detected by the human sensor 30, the process proceeds to No in S1 and the carrier output is stopped. Such processing is performed until a passerby is detected by the human sensor 30. In the process of S2, the carrier output is stopped when the carrier is output before the process, and the carrier output is stopped when the carrier is not output before the process. The

When a passerby is detected by the human sensor 30, the process proceeds to Yes in S <b> 1, and a carrier wave (carrier) is output from the wireless tag communication unit 21 via the antenna 22. Here, a predetermined capture command for capturing a specific wireless tag is transmitted together with the carrier (S3). The wireless tag 40 used in the present embodiment is configured to return a response defined when this predetermined capture command is received. In S4, the wireless tag 40 responds to the capture command transmitted in S3. Whether or not the prescribed response has been received. If there is no such prescribed response, the process proceeds to No in S4, and the processes after S1 are repeated. In the authentication process of FIG. 5, after the capture command is started to be transmitted, if there is no prescribed response to the capture command, the capture command is continuously output until the detection by the human sensor 30 is completed. Therefore, as shown in the timing chart of FIG. 6, the carrier output continues during the period in which the human sensor 30 (passerby detection means) detects the passerby.
In the present embodiment, the controller 9 that executes the processes of S1 and S3 corresponds to an example of “carrier output means”, and when the passerby is detected by the human sensor 30 (passer detection means), the antenna It functions to output the carrier via 22.

  In the present embodiment, at least in a situation where there are a plurality of wireless tags 4 in the communicable area (area AR2 where the controller 9 can receive the command from the wireless tag 40 via the antenna 22) as shown in FIG. The carrier output is continued during the period in which the passerby who owns one of the wireless tags 40 is detected by the human sensor 30. Therefore, for example, as shown in FIG. 8A, the wireless tag 40 of the first passer P1 and the third passer P3 is read during a certain period, and the wireless tag 40 of the second passer P2 is recognized. Even if it is not performed, as long as any passerby is detected by the human sensor 30, the output of the carrier is not interrupted, and an opportunity for reading is given. Therefore, even if the wireless tag 40 of the second passer P2 is temporarily not recognized as shown in FIG. 8A, it can be read as shown in FIG. 8B by maintaining the carrier output thereafter. Increases nature.

  In this embodiment, as shown in FIGS. 2 and 7, four antennas 22a, 22b, 22c, and 22d are arranged at a predetermined distance in the width direction of the entrance / exit 3, and a plurality of antennas are arranged in the width direction. A human sensor 30 is provided at a position between 22a, 22b, 22c, and 22d. Specifically, the human sensor 30 is disposed at the center in the width direction of the doorway 3, and one antenna 22 a is provided at one end in the width direction of the doorway 3 (on the left side when the doorway 3 is viewed from the outside as shown in FIG. 2). 22b, and the other antennas 22c and 22d are arranged on the other end side in the width direction of the doorway 3 (on the right side when the doorway 3 is viewed from the outside). One antenna 22a and 22b and the other antenna 22c , 22d are arranged in a form facing the center side in the width direction of the entrance 3 and the lower side. As shown in FIG. 1 and FIG. 7, an area where the wireless tag 40 can read a command output from the controller 9 via the antenna 22 in an area at a predetermined height from the floor outside the vicinity of the entrance 3. AR2 (that is, the area where the wireless tag 40 can acquire the carrier from the antenna 22) includes the monitoring range AR1 of the passerby by the human sensor 30 (passer detection means) and is wider than the monitoring range AR1. It is said that. In the present embodiment, the four antennas 22a, 22b, 22c, and 22d are configured as directional antennas, and the installation angle can be changed for any of the antennas 22a, 22b, 22c, and 22d. Specifically, the installation angles of all the antennas 22a, 22b, 22c, and 22d can be changed to the front and rear and the left and right, and the configuration is such that the direction of the radio wave can be adjusted to the front and rear or the left and right.

  On the other hand, if a legitimate response to the capture command is detected from the wireless tag 40 while the passerby is being detected by the human sensor 30, the process proceeds to Yes in S4 and an authentication process is performed (S5). In the present embodiment, the controller 9 corresponds to an example of a “reception unit” and functions to receive a command output from the wireless tag 40 via the antenna 22. The wireless tag 40 used in the present embodiment is used by a passer-by as shown in FIG. 1 and functions to output a command when a carrier is received from the “carrier output means”. Yes.

In the authentication process of S5, a process of determining whether or not the wireless tag 40 is a regular wireless tag is performed. Specifically, for example, a process of reading the unique ID recorded in the wireless tag 40 is performed, and whether or not the read unique ID corresponds to a permission ID recorded in advance in the management device 50 or the controller 9. The process which judges is performed. If the unique ID corresponds to the registered permission ID, it is determined that the authentication is successful, and the process proceeds to Yes in S6. On the other hand, if the unique ID does not correspond to the registered permission ID, it is determined that the authentication has failed and the process proceeds to No in S6.
In this embodiment, the controller 9 corresponds to an example of a “wireless tag reading unit” and functions to read the unique ID recorded in the wireless tag 40 when a command is received by the “reception unit”. . The controller 9 corresponds to an example of an “ID determination unit” and functions to determine whether the unique ID read by the “wireless tag reading unit” is a permission ID that is allowed to pass through the entrance 3. To do.

If the authentication is successful in the authentication process of S5, the process proceeds to Yes in S6, and the unlocking process of the electric lock 7 is performed (S7). In this unlocking process, an unlock signal is given to the electric lock 7 from the control circuit 10, and the electric lock 7 operates in an unlocked state in accordance with the unlock signal.
The controller 9 and the electric lock 7 correspond to an example of “locking means”, and are configured to be able to switch the entrance / exit 3 between a locked state and an unlocked state, and the unique ID is determined to be a permission ID by the “ID determining means”. Functioning to switch the doorway 3 to the unlocked state.

  On the other hand, if the authentication fails in the authentication process of S5, the process proceeds to No in S6 and performs a predetermined error process (S8). This error process is, for example, a process for notifying the user that the authentication has failed. For example, information indicating that the authentication has failed may be displayed on a display unit (not shown). Etc. may be performed. Note that the process of S8 may be omitted, and if authentication fails, nothing may be performed and the process may return to S1.

(Main effects of the first embodiment)
In the traffic management system 1 according to the present embodiment, when the passerby is detected by the human sensor 30 (passer detection means) that detects the passerby existing in the monitoring range AR1, the antenna 22 is detected. A "carrier output means" (controller 9) for outputting a carrier via the wireless tag 40, which is carried by a passerby and outputs a command when the carrier output from the controller 9 via the antenna 22 is received. "Receiving means" (controller 9) for receiving a command output from the wireless tag 40 via the antenna 22, and the unique information recorded in the wireless tag 40 when the command is received by this "receiving means""Radio tag reading means" (antenna 22 and controller 9) for reading the ID and this "wireless tag reading means" “ID discrimination means” (controller 9) for discriminating whether or not the unique ID is a permission ID that is allowed to pass through the entrance 3 and the entrance 3 can be switched between a locked state and an unlocked state. “Locking means” (controller 9 and electric lock 7) for switching the doorway 3 to an unlocked state when the unique ID is determined to be a permission ID by the “determination means” is provided. In this way, since it is possible to detect that the passerby who has the wireless tag 40 has entered the monitoring range AR1 and to output the carrier, the carrier is output at an appropriate time (when the passer enters the monitoring range AR1). To save power. Then, it is determined whether or not the unique ID recorded in the wireless tag 40 is a permission ID. If the unique ID is a permission ID (that is, a passer-by has a legitimate wireless tag 40), an appropriate solution is obtained. A lock operation can be performed. Furthermore, in the present invention, the carrier output is continued during the period when the “passerby detection means” detects the passerby, and therefore, while the passerby is present in the monitoring range AR1, the wireless tag 40 Reading can be continued, and reading spills due to the suspension of carrier output can be effectively reduced.

  Further, when there are a plurality of wireless tags 40 in the command readable area AR2 by the controller 9 (reception means), a period during which a person who has at least one of the wireless tags 40 is detected by the human sensor 30. Medium and career output continues. In this way, even if the authentication of any one of the wireless tags 40 is completed in a situation where a plurality of wireless tags 40 can be read, as long as any passer-by is detected by the human sensor 30, Since the output is maintained, it is possible to reliably authenticate other wireless tags 40 other than the wireless tag 40 that has been authenticated.

  The command readable area AR2 by the controller 9 (reception means) includes a passer-by monitoring area AR1 by the human sensor 30 (passer detection means) and is wider than the monitoring area AR1. . In this manner, the wireless tag 40 is easily maintained in the readable area AR2 immediately after the passerby is detected and the wireless tag 40 is read, and the wireless tag 40 can be read quickly and immediately after the passerby is detected. It can be done well.

  The plurality of antennas 22a to 22d are arranged at a predetermined distance in the width direction of the entrance / exit 3, and the human sensor 30 (passer detection means) is located at a position between the plurality of antennas 22a to 22d in the width direction. Is provided. If it does in this way, it will become easy to cover the width direction outer side of the human sensitive sensor 30 with the antenna 22, and after the passerby is detected by the human sensitive sensor 30, it will become difficult to remove | deviate from the radio | wireless tag 40 from the readable area AR2. Therefore, for example, the wireless tag 40 can be read more favorably in an environment where a passerby can move in the width direction.

  In addition, a human sensor 30 (passer detection means) is disposed in the center in the width direction of the entrance 3, and one antenna 22 a, 22 b is disposed on one end side in the width direction of the entrance 3. The other antennas 22c, 22d are arranged on the end side, and both the one antenna 22a, 22b and the other antenna 22c, 22d are arranged in a form facing the center side in the width direction of the entrance 3 and the lower side. ing. In this way, the central portion in the width direction of the entrance / exit 3 where the human sensor 30 is disposed can be preferentially covered by the antennas on both sides, and the detection leakage (near the central portion in the width direction where the passer-by is most likely to pass) Reading spillage) can be effectively suppressed.

[Second Embodiment]
Next, a second embodiment will be described.
FIG. 9 is an explanatory diagram schematically illustrating a traffic management system according to the second embodiment of the present invention. FIG. 10 is a flowchart illustrating the flow of authentication processing performed in the traffic management system according to the second embodiment.

  The traffic management system 200 according to the second embodiment is different from the traffic management system 1 of the first embodiment in that the antenna 22 can be driven and a part of the authentication process is changed. It is the same as the form. Therefore, parts different from those of the first embodiment will be described mainly, and parts similar to those of the first embodiment will be denoted by the same reference numerals as those of the first embodiment, and detailed description thereof will be omitted. In particular, since the hardware configurations of FIGS. 2 and 4 are the same, description will be made with reference to FIGS. 2 and 4 as appropriate. In this embodiment, an actuator 210 is connected to the control circuit 10 of FIG. 3, and the displacement of the actuator 210 can be controlled by the control circuit 10.

  As shown in FIG. 9, in the traffic management system 200 according to the second embodiment, the antenna 22 can be driven by the actuator 210. The antenna 22 is supported by a frame (not shown) so as to be rotatable around a predetermined rotation axis (for example, a rotation axis in the width direction), for example, and can be rotated by a pair of bearings provided on the frame (not shown). The rotation angle is changed by the actuator 210.

  FIG. 10 shows a flow of authentication processing in the traffic management system 200 according to the second embodiment. Note that the processes of S21, S22, S23, and S24 are the same as S1, S2, S3, and S4 of the authentication process (FIG. 5) in the first embodiment, respectively. In this embodiment, after a capture command is transmitted in S23, if a response to the capture command is not confirmed, the process proceeds to No in S24, and the rotation angle of the actuator 210 (that is, the angle of the antenna 22). Is changed by a predetermined angle (for example, several degrees).

  In the present embodiment, for example, a predetermined first angle (for example, 0 °) can be switched with respect to an angle θ formed by a predetermined direction (arrow F1) in which radio waves are concentrated on the antenna 22 and a vertical direction (arrow F2). The predetermined second angle (for example, 45 °) is set as the maximum value as the minimum value, and in the process of S25, the first angle is reached and the second angle is reached (that is, the antenna 22 is directly below). The angle from the position facing (see the alternate long and short dash line 22 ') to the position facing forward 45 degrees obliquely (see the alternate long and two short dashes line 22 ") is increased in a predetermined positive direction, and the direction of the antenna 22 is gradually increased upward. On the other hand, after reaching the second angle, until the first angle is reached (that is, until the antenna 22 is inclined 45 degrees forward and then downward), the angle is in a predetermined minus direction. Decrease Allowed, and gradually displacing the lower the orientation of the antenna 22.

  The actuator 210 corresponds to an example of “installation angle changing means”, and functions to drive the antenna 22 and change the installation angle of the antenna 22. An installation angle changing unit is provided, and the installation angle changing unit changes the installation angle of the antenna after the carrier is output by the carrier output unit.

  The processes of S21, S23, S24, and S25 are repeated until a response to the capture command is confirmed or until detection by the human sensor 30 is completed, and a response to the capture command is confirmed from the wireless tag 40 In S24, the process proceeds to Yes, and the processes after S26 are performed. Note that the processes of S26, S27, S28, and S29 are the same as S5, S6, S7, and S8 of the authentication process (FIG. 5) performed in the first embodiment, and thus detailed description thereof is omitted.

(Main effects of the second embodiment)
Thus, in the traffic management system 200 according to the second embodiment, the actuator 210 (installation angle changing means) that drives the antenna 22 and changes the installation angle of the antenna 22 is provided. After the carrier is output by the “carrier output means” (controller 9), the installation angle of the antenna 22 is changed. In this way, even if the angle of the antenna 22 is not appropriate at the start of carrier output, the antenna 22 is driven after the carrier is output and is easily installed at an appropriate angle, so that the wireless tag 40 can be read satisfactorily. It becomes easy to be broken.

[ Reference example ]
Next, a reference example will be described.
FIG. 11 is an explanatory diagram schematically illustrating a traffic management system according to a reference example . 12 is a cross-sectional view schematically illustrating a laser radar device used in the traffic management system of FIG. FIG. 13 is a flowchart illustrating the flow of detection processing performed in the traffic management system of FIG. FIG. 14 is an explanatory diagram for explaining the traffic management area and the readable area of the laser radar device of FIG. FIG. 15 is an explanatory diagram schematically illustrating the belongings (tags) to which the information code read by the traffic management system according to the reference example is attached. FIG. 16A is a graph illustrating the relationship between the angle of the deflection unit and the detected distance value when laser scanning is performed by the laser radar apparatus of FIG. FIG. 16B is a graph illustrating the relationship between the angle of the deflecting unit and the amount of received light when an information code existing in the readable range is scanned. FIG. 17 is an explanatory diagram conceptually illustrating the tracking performed in the traffic management system of FIG.

A traffic management system 300 according to the reference example includes a controller 390 configured as an information processing device, an electric lock 7, and a laser radar device 301. The electric lock 7 has the same configuration as that of the electric lock 7 used in the first embodiment. When the unlocking signal is output from the controller 390, the unlocking operation is performed, and the locking signal is output from the controller 390. When locked, the locked state is maintained.

  The controller 390 includes a CPU, a memory (ROM, RAM, nonvolatile memory, etc.), and a communication unit. The controller 390 is configured to be able to acquire information from a laser radar device 301 described later. It functions to perform various types of information processing according to information.

  Next, the overall configuration of the laser measurement apparatus 301 will be described with reference to FIG. As shown in FIG. 12, the laser measurement device 301 includes a laser diode 310 and a photodiode 320 that receives reflected light L2 from the detection object, and is configured as a device that can detect the distance and direction to the detection object. ing.

The laser diode 310 corresponds to an example of “laser light generation means”, receives a pulse current from a drive circuit (not shown) under the control of the control circuit 370, and receives a pulse laser light (laser light L1) corresponding to the pulse current. ) Is emitted intermittently. In the reference example , laser light from the laser diode 310 to the detection object is conceptually indicated by a symbol L1, and reflected light from the detection object to the photodiode is conceptually indicated by a symbol L2. .

  When the laser beam L1 is generated from the laser diode 310 and the laser beam L1 is reflected by the detection object, the photodiode 320 receives the reflected light L2 and converts it into an electrical signal. In addition, about the reflected light from a detection object, the thing of a predetermined area | region is taken into the deflection | deviation part 341, and FIG. 12 shows the example in which the reflected light of the area | region between two lines shown with the code | symbol L2 is taken in. ing.

A lens 360 is provided on the optical axis of the laser light L1 emitted from the laser diode 310. The lens 360 is configured as a collimating lens, and converts the laser light L1 from the laser diode 310 into parallel light. A mirror 330 is provided on the optical path of the laser light L1 that has passed through the lens 360. The mirror 330 includes a reflection surface 330 a that is inclined with respect to the optical axis of the laser beam L 1 that has passed through the lens 360, and reflects the laser beam L 1 that has passed through the lens 360 toward the rotation deflection mechanism 340. In this reference example , the horizontal laser beam L1 that has passed through the lens 360 is reflected by the mirror 330 in the vertical direction (a direction parallel to a central axis 342a described later), and the reflected vertical laser beam L1 is rotated. The light is incident on the deflection unit 341 of the dynamic deflection mechanism 340.

  The rotation deflection mechanism 340 includes a deflection unit 341 made of a mirror having a flat reflecting surface 341a, a support base 343 that supports the deflection unit 341, a shaft part 342 connected to the support base 343, and the shaft part. And a bearing (not shown) that rotatably supports 342.

  The deflecting unit 341 is disposed on the optical axis of the laser beam L1 reflected by the mirror 330 and is rotatable about a central axis 342a (predetermined central axis). The deflecting unit 341 is configured to deflect (reflect) the laser light L1 from the laser diode 310 toward the space and deflect (reflect) reflected light L2 from the detection object toward the photodiode 320. .

  In addition, the direction of the central axis 342a serving as the rotation center of the deflecting unit 341 substantially coincides with the direction of the laser light L1 incident on the deflecting unit 341 from the mirror 330, and the incident light on which the laser light L1 enters the deflecting unit 341. The position P1 is a position on the central axis 342a.

In this reference example , the direction of the central axis 342a is the vertical direction (Y-axis direction), and the plane direction orthogonal to the central axis 342a is the horizontal direction. Further, a predetermined direction in the horizontal direction is shown as the X-axis direction.

  As shown in FIG. 12, the reflecting surface 341a of the deflecting unit 341 is inclined at an angle of 45 ° with respect to the vertical direction (the direction of the laser light L1 incident on the reflecting surface 341a), and is incident from the mirror 330 side. The laser beam L1 is reflected in the horizontal direction. Further, since the deflecting unit 341 rotates around the central axis 342a in the direction coinciding with the direction of the incident laser beam L1, the incident angle of the laser beam L1 is always maintained at 45 ° regardless of the rotational position of the deflecting unit 41. The direction of the laser beam L1 from the position P1 is configured to be constantly in the horizontal direction (direction orthogonal to the central axis 342a).

Further, in the laser measurement device 301 according to this reference example , the deflection region that deflects the reflected light in the deflection unit 41 (the region of the reflection surface 341a in the deflection unit 341) reflects the reflection region in the mirror 330 (mirror 330). The region of the reflecting surface 330a in FIG.

Further, a motor 350 for driving the rotation deflection mechanism 340 is provided. The motor 350 rotates the shaft portion 342 to rotationally drive the deflection unit 341 connected to the shaft portion 342. In addition, as a specific configuration of the motor 350, for example, a servo motor or the like may be used, or a pulsed laser beam is output in synchronization with a timing at which the deflecting unit 341 faces a direction in which distance measurement is desired, using a motor that rotates regularly. Thus, detection of a desired direction may be possible. In this reference example , as shown in FIG. 12, a rotation angle position sensor 352 that detects the rotation angle position of the shaft portion 342 of the motor 350 (that is, the rotation angle position of the deflection portion 341) is provided. As the rotation angle position sensor 352, various types of sensors can be used as long as they can detect the rotation angle position of the shaft portion 342, such as a rotary encoder.

In this reference example , the rotation deflection mechanism 340 and the motor 350 for driving the rotation deflection mechanism 340 function as “scanning means”, and function to scan the laser light by projecting the laser light L1 into the space. ing. The photodiode 320 described above corresponds to an example of “light detection means”, and functions so that the laser light scanned by the “scanning means” detects reflected light reflected by the detection object.

  A condensing lens 362 that condenses the reflected light toward the photodiode 320 is provided on the optical path of the reflected light L2 from the rotation deflection mechanism 340 to the photodiode 320, and the condensing lens 362 and the photodiode. A filter 364 is provided between 320. The condensing lens 362 collects the reflected light L2 from the deflecting unit 341 and guides it to the photodiode 320, and functions as a condensing unit. The filter 364 functions to transmit the reflected light L2 and remove light other than the reflected light L2 on the optical path of the reflected light L2 from the rotation deflection mechanism 340 to the photodiode 320. The filter 364 is configured by a wavelength selection filter that transmits only light having a specific wavelength corresponding to the reflected light L2 (for example, light having a wavelength in a certain region) and blocks other light, for example.

In this reference example , the laser diode 310, the photodiode 320, the mirror 330, the lens 360, the rotation deflection mechanism 340, the motor 350, and the like are housed in the case 303, and dust protection and impact protection are achieved. A window-shaped light guide 304 that allows the laser light L1 and the reflected light L2 to pass therethrough is formed around the deflection unit 341 in the case 303 so as to surround the deflection unit 341. The light guide unit 304 has an annular shape centering on the optical axis of the laser beam L1 incident on the deflecting unit 341, and is configured to extend approximately 360 °. A laser light transmission plate 305 made of, for example, is disposed to prevent dust.

In this laser radar device, the relative rotation position of the deflecting unit 341 when a predetermined reference position (for example, the origin position of the rotary encoder) is used as a reference can be detected. With reference to the “reference position”, each rotation position of the deflecting unit 341 at the time of each irradiation of the pulsed laser light irradiated intermittently can be detected (that is, each rotation position at each irradiation is It is possible to detect how much the position is rotated with reference to the “reference position”). When the reflected light from the detection object is received by the photodiode 320 at any of the rotation positions, the angle of the deflection unit 341 at the time of the light reception is an angle rotated from the “reference position”. It is possible to identify whether there is. Therefore, the direction of the detection object can be detected using the reference direction as the irradiation direction of the laser beam L1 emitted from the deflecting unit 341 at the “reference position”. When the light is received by the photodiode 320 as described above, the laser light is measured by measuring the time from when the laser light L1 is output by the laser diode 10 until the reflected light L2 is detected by the photodiode 20. The distance to the detected object can be obtained in consideration of the speed of light (speed of light).
In this reference example , the control circuit 370 corresponds to an example of a “time detection unit”. After the pulse laser beam L1 is generated by the laser diode 310 (laser generation unit), the pulse laser beam L1 is an object. It functions to detect the time until it is reflected and detected by the photodiode 320 (light detection means). The control circuit 370 corresponds to an example of a “distance calculation unit” and functions to calculate the distance to the detection object based on the time detected by the “time detection unit”.

Next, the detection process performed in the traffic management system 300 according to this reference example will be described.
In the traffic management system 300, for example, the detection process is performed by the control circuit 370 of the laser radar device 301 in the flow as shown in FIG.
In this detection process, first, a process is performed to determine whether or not a person has been detected within the management area (monitoring range) (S31). In this reference example , for example, as shown in FIG. 14, the laser beam is irradiated when the deflection unit 341 (FIG. 12) is in a predetermined angle range (for example, an angle range of about 180 degrees as shown in FIG. 14). And a range within a predetermined distance X1 from a predetermined origin position of the laser radar device 301 (for example, the position P1 in FIG. 12) is set as a management area (monitoring range) AR3. It detects whether or not a person exists. In the laser radar device 301 of FIG. 12, the above-described object detection process is always performed in parallel with the process of FIG. 13, and an object is detected in the management area AR3 by this object detection process. If the object is determined to be a person by a predetermined determination method, the process proceeds to Yes in S31.

  Various known methods can be adopted as a method for determining whether or not the object detected by the object detection process is a person. For example, by calculating the distance to the detection object for each angle of the deflecting unit 341 in the angle range in which the object is irradiated with laser light when a certain object is detected, the position of the front surface of the detection object is specified. In addition, the width value of the detected object can be calculated. A method of determining that the detected object is “person” when the width value of the detected object detected in this way is equal to or greater than a predetermined value can be used. Such determination processing is performed, and if an object determined to be “person” is detected in the management area AR3, the process proceeds to Yes in S31. On the other hand, if an object determined to be “person” is not detected, the process proceeds to No in S31.

In this reference example , the management area AR3 corresponds to an example of a “monitoring range”. The laser radar device 301 corresponds to an example of a “passerby detection unit” and functions to detect a passerby existing in the monitoring range. The control circuit 370 corresponds to an example of a “passer discrimination unit”, and based on the distance calculation result by the “distance calculation unit” at a plurality of times (time of each angle of the deflection unit 341), the detected object is It functions to determine whether or not you are a passerby.

When “person” is detected in S31, it is determined whether or not the “person” exists in a predetermined readable area. In this reference example , as shown in FIG. 14, the laser beam L1 is irradiated when the deflection unit 341 is in a predetermined angular range (for example, an angular range of about 180 degrees as shown in FIG. 14). In addition, a range within a predetermined distance X2 from a predetermined origin position (for example, the position P1 in FIG. 12) of the laser radar device 301 is set as a readable area AR4. In S32, the “person” detected in S31 is like this. It is determined whether or not it is in the readable area AR4. If the “person” detected in S31 is not in the readable area AR4, the process proceeds to No in S32, and the coordinates of the “person” are recorded as tracking data in a memory (not shown) (S37).

On the other hand, if it is determined that the “person” detected in S31 is in the readable area AR4, an authentication process is performed in S33. In the traffic management system 300 according to this reference example , a tag 380 (for example, an employee ID card, an entrance permit, an entrance permit, etc.) with an information code C in a barcode format as shown in FIG. 15 is prepared. For example, it is determined that a normal passer-by P approaches the entrance / exit 3 while holding such a tag 380. A unique ID is recorded in the information code C of each tag 380 possessed by each passer P. At S31, an attempt is made to read the information code C of the tag 380 possessed by the passer P, and the recorded unique ID is It is determined whether it corresponds to a permission ID registered in advance.

Specifically, for example, reading is performed as follows. In this reference example , scanning is performed in the horizontal direction at a predetermined height by the laser radar device 301 shown in FIG. 12, and an information code C is arranged near this height for a regular passerby P. I have a tag 380. On the other hand, the laser radar device 301 continuously performs laser scanning during operation, and at each angle (deflection unit) based on the reflected light of each pulse laser beam emitted at each angle of the deflection unit 241 (FIG. 12). The distance from the origin position (for example, position P1) of the laser radar device 301 to the position where the pulsed laser beam L1 reaches is calculated every step 341). As shown in FIG. 16A, the distance value to the irradiation position (arrival position) of the pulse laser beam L1 can be calculated for each angle of the deflecting unit 341.

Further, the angle range (see range Y in FIG. 16A) where the distance from the origin position (for example, position P1) of the laser radar device 301 to the irradiation position (arrival position) of the pulse laser beam L1 is shorter than the distance X2. (I.e., for an angular range in which the laser beam L1 is irradiated on a detected object (see passerby P in FIG. 14) present in the readable area AR4), as shown in FIG. The received light amount waveform is obtained, and decoding processing is performed based on the received light amount waveform. A method of performing decoding based on the received light amount waveform as shown in FIG. 16B is well known and will not be described in detail. For example, scanning is performed as indicated by L1 ′ in FIG. ) Is obtained, binarization is performed on this waveform based on a predetermined threshold value D1, and data is decoded based on the obtained width values of each light color portion and each dark color portion. The method of doing is mentioned.
In this reference example , the laser radar device 301 corresponds to an example of “information code reading unit”, and reads the information code C possessed by the passerby P in the readable area AR4 (predetermined readable area). To work.

When the authentication process in S33 is successful (that is, when the information code C is read normally and the unique ID recorded in the information code C corresponds to the permission ID), the process proceeds to Yes in S34. An entrance permission process is performed (S35). In this process, for example, a signal indicating that the authentication is successful is given to the controller 390. In this reference example , for example, when an authentication success signal is given from the laser radar device 301 to the controller 390, an unlock signal is output from the controller 390 to the electric lock 7 for a certain period. The electric lock 7 operates in the unlocked state during the period when the unlock signal is output. Note that the unlock signal from the controller 390 is output for a certain period after the controller 390 acquires the authentication success signal, for example, and after that, the unlock signal is output again.

In the present reference example , the control circuit 370 that executes the processes of S33 and S34 corresponds to an example of “determination means”. Based on the reading result of the information code C by the “information code reading means”, the “passer detection means” It functions to determine whether or not the passerby P detected by the above is a person permitted to pass through the entrance 3. Further, the control circuit 370, the controller 390, and the electric lock 7 correspond to an example of “locking means” and are configured to be able to switch the entrance / exit 3 between a locked state and an unlocked state. When it is determined that the person is permitted to pass through the doorway 3, the doorway 3 functions to switch to the unlocked state.

On the other hand, when the authentication process in S33 has failed (for example, when the information code has not been successfully read within a certain period of time, or when the unique ID corresponding to the permission ID is not recorded in the read information code C). ), The process proceeds to No in S34 to perform a notification process (S36). This notification process may be, for example, a process of turning on a lamp (not shown) or sounding a buzzer (not shown), or a process of transmitting information indicating that the authentication has failed to the controller 390 or another management apparatus. It may be.
In this reference example , the control circuit 370 that executes the process of S36 corresponds to an example of “notification means”, and information detected by the “information code reading means” after the passerby is detected by the “passer detection means”. When the reading of the code C fails, or when the information code C is not read by the “information code reading means” for a certain period of time, the information C functions to be notified.

  Also, in the process of S36, if a buzzer is sounded to notify that the reading has failed, it is estimated that the information code C has not been normally read when a legitimate passerby receives this notification. For example, it is possible to take measures such as bringing the tag 380 closer to the front of the laser radar device 301. As described above, if the information code C is placed at a position where the reading of the information code C is more likely to succeed, the authentication is likely to succeed in the subsequent authentication processing of S33. Further, if an announcement such as “Please place the barcode on the front of the reading device” is made in the notification process of S36, it will be more kind to a legitimate passerby.

In addition, in this reference example , when the passerby does not exist in the readable area AR4, the process of S37 is performed every time No in S32 and No in S34, and the passerby's coordinates are recorded. Thus, it is possible to track passers-by as in P11 to P16 of FIG. In the example of FIG. 17, in the case of the first S32No after the passerby P is detected, the coordinates of the initial position P11 of the passerby P are specified in S37, and in the case of the next S32No, the process proceeds to S37. The coordinates of the second position P12 of the passerby P are specified. Thus, by identifying and recording the coordinates of the passer-by P every time the process of S37 is executed, the behavior of the passer-by P can be grasped as shown in FIG. 17 and the information on the behavior can be used. It has become. For example, when the passer-by P does not move more than a predetermined distance from a certain position in the management area AR3 for a certain time or longer, the passer-by's poor physical condition or the passer-by's abnormal behavior (for example, illegal behavior) may occur. Because of concern, in such a case, notification processing (buzzer ringing, lamp lighting, contact with other management devices, etc.) can be performed.

Alternatively, after detecting that the passer-by P has entered the management area AR3 in S31 of FIG. 13, the passer-by P is tracked and a normal tracking route (for example, a tracking route of a predetermined length or a predetermined time is required). When the information enters the readable area AR4 via the tracking path), the authentication process of S33 may be performed to start reading the information code C. In this case, for example, when a detected object is detected in the readable area AR4 in a state where there is no record of the tracking path from the boundary of the management area AR3 to the boundary of the readable area AR4, this is ignored if it is not “person”. Can be performed.
In this reference example , the control circuit 370 corresponds to an example of a “tracking unit”, and when the detected object is determined to be a passer by the “passer determining unit”, the movement of the passer is tracked. To work.

[Other Embodiments]
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

  In the first embodiment, authentication is performed when the unique ID corresponds to any of the permission IDs registered in advance in the management device 50 or the controller 9, but the present invention is not limited to such an authentication method. For example, the wireless tag 40 may be authenticated by a predetermined authentication method, and when the authentication is successful, the unique ID recorded in the wireless tag 40 may be determined as the permission ID. The authentication process may be any of a known internal authentication method, external authentication method, and mutual authentication method. For example, when internal authentication is performed, the controller 9 performs internal authentication for the wireless tag 40 to be authenticated. And a random number generated in the controller 9 is transmitted to the wireless tag 40. On the other hand, the wireless tag 40 receives the random number, encrypts it with an encryption key provided therein, and transmits the encrypted data to the controller 9. The controller 9 receives this encrypted data, decrypts it with the decryption key, and determines whether or not the decrypted data matches the previously transmitted random number (that is, the random number generated inside the controller 9). If it is determined that they match, the wireless tag 40 to be authenticated is authenticated as a correct tag.

In the first embodiment, an example in which the human sensor 30 is used as the “passerby detection unit” has been described, but a laser radar device such as a reference example may be used.

  In the second embodiment, the example in which the antenna 22 is swung in the front-rear direction until the detection by the human sensor 30 after the capture command is transmitted in S23 or until the response is detected is shown. Until the detection by the human sensor 30 is completed (i.e., No in S21) or until a response to the command is detected (i.e., Yes in S24). The antenna 22 may be swung in the left-right direction. Alternatively, until the detection by the human sensor 30 is completed after the capture command is transmitted in S23 (that is, until No in S21) or a response to the command is detected (that is, Yes in S24). The antenna 22 may be configured to swing in the front-rear and left-right directions.

1,200,300 ... traffic management system 2 ... room 3 ... doorway 5 ... door 7 ... electric lock (locking means)
9. Controller (carrier output means, receiving means, wireless tag reading means, ID discrimination means, locking means)
22: Antenna (wireless tag reading means)
30 ... Human sensor (passer detection means)
40 ... wireless tag 210 ... actuator (installation angle changing means)
301 ... Laser radar device (passer detection means, information code reading means)
310 ... Laser diode (laser light generating means)
310 ... Photodiode (light detection means)
340 ... Rotating deflection mechanism (scanning means)
350: Motor (scanning means)
370 ... Control circuit (locking means, time detection means, distance calculation means, passer-by discrimination means, tracking means, notification means)
390 ... Controller (locking means)
P ... Passer C ... Information code AR1 ... Monitoring range AR2 ... Readable area AR3 ... Management area (monitoring range)
AR4 ... Readable area

Claims (6)

A traffic management system for managing traffic at the entrance and exit,
A passer-by detection means for detecting a passer-by existing in the monitoring range;
Carrier output means for outputting a carrier via an antenna when the passer-by is detected by the passer-by detection means;
A radio tag that is carried by the passer-by and outputs a command when the carrier is received from the carrier output means;
Receiving means for receiving the command output from the wireless tag;
A wireless tag reading means for reading a unique ID recorded in the wireless tag when the command is received by the receiving means;
ID determination means for determining whether or not the unique ID read by the wireless tag reading means is a permission ID that is allowed to pass through the entrance;
Locking means for switching the doorway to the unlocked state when the doorway is configured to be switchable between a locked state and an unlocked state, and when the unique ID is determined as the permission ID by the ID determining means;
With
The carrier output unit is characterized in that the carrier output unit continues outputting the carrier during a period in which the passer-by detection unit detects the passer-by. In the carrier output means, when there are a plurality of the wireless tags in the readable area of the command by the receiving means, the passer-by who owns at least one of the wireless tags is detected by the passer-by detection means . The traffic management system according to claim 1, wherein the carrier output is continued during a period of time.   The readable area of the command by the receiving unit includes the monitoring range of the passer by the passer detection unit and is wider than the monitoring range. Item 3. The traffic management system according to item 2. A plurality of the antennas are arranged at a predetermined distance in the width direction of the entrance and exit,
The traffic management system according to any one of claims 1 to 3, wherein the passer-by detection means is provided at a position between the plurality of antennas in the width direction. The passer-by detection means is disposed at the center in the width direction of the doorway,
One of the antennas is arranged at one end side in the width direction of the doorway,
The other antenna is disposed on the other end side in the width direction of the doorway,
5. The traffic management system according to claim 4, wherein both of the one antenna and the other antenna are arranged in a form facing a center side in a width direction and a lower side of the entrance / exit. Installation angle changing means for changing the installation angle of the antenna by driving the antenna;
The traffic management system according to any one of claims 1 to 5, wherein the installation angle changing unit changes the installation angle of the antenna after the carrier is output by the carrier output unit.

Images