JP2019175252A - Authentication system and portable terminal - Google Patents

Abstract

To provide an authentication system and a portable terminal capable of improving authentication accuracy of a user.SOLUTION: An authentication system includes a radio wave transmitter, a portable terminal held on the front side of a user's body, and an authentication device. The radio wave transmitter is arranged facing an authentication object across a predetermined space and has radio wave transmission means for transmitting a radio wave to the authentication object. The portable terminal has measurement means for measuring radio field intensity of the radio wave received from the radio wave transmitter, determination means for determining whether or not the user located in the predetermined space faces the authentication object on the basis of the radio field intensity, and transmission means for transmitting an authentication request signal including ID information of the user to the authentication device when determining the user faces the authentication object. The authentication device has a storage section for storing ID information of the user, and authentication means for performing authentication processing of the user by comparing the ID information included in the authentication request signal with the ID information stored in the storage section in advance when receiving the authentication request signal from the portable terminal.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an authentication system and a portable terminal.

  In an authentication system that performs authentication processing for users who attempt to pass through a door that restricts entry into the security area, the user does not hold an ID card or the like over a card reader installed near the door. Some users are authenticated.

  For example, in the hands-free authentication system described in Patent Document 1, when a user who has a portable terminal such as a wireless tag approaches the door, the portable terminal automatically installs the user's ID information near the door. To an authentication device such as a wireless tag reader. Then, the authentication device measures the signal strength of the radio signal transmitted from the mobile terminal, and performs authentication processing only for a user who exists near the door such that the measured signal strength is equal to or greater than a predetermined threshold. If the authentication is successful, the door is unlocked.

JP2012-219383A

  However, although the technique described in Patent Document 1 can determine whether or not the user exists in the vicinity of the door, it can sufficiently determine whether or not the user really has an intention to pass through the door. Can not do it. For example, in the authentication system described in Patent Literature 1, there are only users who are standing in the vicinity of a door or users who only pass in front of the door in the vicinity of the door with a portable terminal. Thus, authentication is automatically performed and the door is unlocked. As a result, the door is unintentionally unlocked and a third party can pass through the door, or authentication is performed even though the user does not pass through the door, and the user enters the security area. It will be recorded that you have entered, and you will not be able to manage correctly.

  Then, an object of this invention is to provide the authentication system and portable terminal which can improve a user's authentication precision.

  According to one aspect of the present invention for solving such a problem, an radio wave transmitter, a portable terminal held on the front surface of a user's body, and an authentication system including an authentication device, the radio wave transmitter includes: The mobile terminal has a radio wave transmitting means that is disposed opposite to the authentication target with a predetermined space interposed therebetween and that transmits a radio wave toward the authentication target, and the mobile terminal receives the radio wave intensity of the radio wave received from the radio wave transmitter. A measuring means for measuring a signal, a determining means for determining whether or not a user located in a predetermined space is directed to the authentication object based on the radio wave intensity, and a determination that the user is directed to the authentication object And transmitting means for transmitting an authentication request signal including the user ID information to the authentication device. The authentication device authenticates from the storage unit storing the user ID information and the portable terminal. When a request signal is received, the authentication request signal Having an authentication means for executing authentication processing of the user by comparing the Murrell ID information and the previously stored ID information in the storage unit.

  The determination unit preferably determines that the user is facing the authentication target when the radio wave intensity is equal to or less than a predetermined threshold.

  The determination means preferably determines that the user is facing the authentication object when the radio wave intensity decreases by a predetermined change width or more within a predetermined period.

  The authentication device is attached to the authentication object, and one of the mobile terminal and the authentication device transmits a radio signal to the other of the mobile terminal and the authentication device, and the other is mobile based on the signal strength of the radio signal received from the other. It further includes proximity determining means for determining whether or not the terminal is in the vicinity of the authentication target, and the authentication means determines that the mobile terminal is in the vicinity of the authentication target and receives an authentication request signal from the mobile terminal. In such a case, it is preferable to execute the authentication process.

  The mobile terminal includes a motion detection unit that detects the movement of the mobile terminal, a stationary determination unit that determines whether the user is walking based on the magnitude of the movement of the mobile terminal detected by the motion detection unit, The authentication unit preferably executes the authentication process when it is determined that the user is not walking and the authentication request signal is received from the portable terminal.

  The authentication object is a restricting means that physically restricts movement from the first space to the second space, and the authentication device restricts the restriction when the authentication means determines that the authentication is successful. It is preferable to further have a release part.

  According to another aspect of the present invention, a portable terminal that is held on the front surface of a user's body and that is to be authenticated from a radio wave transmitter that is disposed to face an authentication target across a predetermined space. Measuring means for measuring the radio field intensity of a radio wave transmitted toward an object, determination means for determining whether or not a user located in a predetermined space is facing the object to be authenticated, based on the radio field intensity, and using And transmitting means for transmitting an authentication request signal including the ID information of the user to the authentication device when it is determined that the person is suitable for the authentication object.

  ADVANTAGE OF THE INVENTION According to this invention, the authentication system and portable terminal which can improve a user's authentication precision are provided.

It is a figure showing roughly the composition of the authentication system concerning a 1st embodiment. It is a block diagram which shows the structure of the portable terminal in the authentication system which concerns on 1st Embodiment, an authentication apparatus, and a radio wave transmitter. It is a flowchart which shows the process of the portable terminal in the authentication system which concerns on 1st Embodiment. It is a flowchart which shows the process of the authentication apparatus in the authentication system which concerns on 1st Embodiment. It is a figure for demonstrating the field intensity of the electromagnetic wave received from the electromagnetic wave transmitter measured by the portable terminal of the authentication system which concerns on 1st Embodiment.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited to the following embodiment, In the range which does not deviate from the summary, it can change suitably. In addition, components having the same or corresponding functions in each drawing are denoted by the same reference numerals, and the description thereof may be omitted or simplified.

[First Embodiment]
FIG. 1 is a diagram schematically showing a configuration of an authentication system 1 according to the first embodiment. FIG. 1A is a view of the authentication system 1 when viewed from the front side of the door 6. FIG. 1B is a diagram when the authentication system 1 is viewed from above the door 6. The authentication system 1 includes a mobile terminal 2, an authentication device 3, and a radio wave transmitter 4.

  In the public area of FIG. 1, there are users 7 (7a, 7b) who carry the portable terminal 2. The user 7a is facing the door 6 trying to enter the security area hands-free. On the other hand, the user 7b is just going past the door 6. When viewed from the user 7a, the front side of the door 6 is a public area, and the other side of the door 6 is a security area. Entrance from the public area to the security area is restricted by the door 6. The door 6 is locked in a normal state, and locking / unlocking of the door 6 is controlled by the authentication device 3 provided near the door 6.

  Here, the exit of the user 7 from the security area to the public area is not particularly limited in the present embodiment. When leaving the security area, the door 6 may be locked or unlocked in the same manner as entering the security area, or the door 6 may be freely passed. The means for restricting the passage of the user 7 may be other than the door 6, for example, physically moving the user 7 from the first space to the second space adjacent to the first space in a predetermined area. Opening / closing control such as a flapper-type security gate or an automatic door may be performed. Further, the user 7 may be, for example, a robot other than a person.

  The authentication system 1 uses an authentication process for a user 7a who intends to pass through the door 6 and does not perform an authentication process for a user 7b who does not intend to pass through the door 6 It is determined whether the persons 7a and 7b are facing the door 6. Specifically, it is determined whether or not the front surfaces of the users 7a and 7b are facing the door 6.

  The mobile terminal 2 is used while being held on the front surface of the user 7. As the mobile terminal 2, for example, a wireless tag or a smartphone is used. The portable terminal 2 is stored in a storage body that transmits radio waves, and is lowered from the neck of the user 7 to the front surface of the user 7 body by a neck strap or the like.

  The authentication device 3 performs an authentication process for the user 7. Although the authentication device 3 in FIG. 1 is provided on the door 6, the present embodiment is not limited to this. The authentication device 3 may be provided in addition to the door 6 and may be provided along with the door 6 such as a wall surface, ceiling, or floor around the door 6.

  The radio wave transmitter 4 is disposed to face the door 6 across a predetermined space in which the user 7 can move, and transmits radio waves toward the door 6. As the radio wave transmitter 4, for example, a BLE (Bluetooth (registered trademark) Low Energy) beacon that periodically transmits a beacon signal is used. The radio wave transmitter 4 may be disposed anywhere on the ceiling, wall, ground, or the like as long as the radio transmitter 4 faces the door 6 across a predetermined space.

  The management device 5 is a database server or the like, and adds the area information and time information to the admission record information received from the plurality of authentication devices 3 and registers them in the database.

  FIG. 2 is a block diagram showing configurations of the mobile terminal 2, the authentication device 3, and the radio wave transmitter 4 in the authentication system 1 according to the first embodiment.

  FIG. 2A shows the configuration of the mobile terminal 2. The mobile terminal 2 includes a control unit 20, a storage unit 21, a wireless communication unit 22, a motion detection unit 23, and a display unit 24.

  The control unit 20 is a processor such as a CPU (Central Processing Unit) that executes a program recorded in the storage unit 21 and controls and calculates the portable terminal 2. The control unit 20 includes a measurement unit 25, a determination unit 26, a transmission unit 27, and a stationary determination unit 28.

  The storage unit 21 stores a program for performing control and calculation of the mobile terminal 2 executed by the control unit 20. In addition, the storage unit 21 stores in advance ID information of the user 7 who owns the mobile terminal 2, identification information of the authentication device 3, identification information of the radio wave transmitter 4, and the like. Here, the ID information of the user 7 is, for example, an ID number or an employee number assigned to each user 7. Alternatively, the ID information of the user 7 may be an identification number or a serial number set for each portable terminal 2 held by the user 7. Further, the storage unit 21 may store the radio wave intensity from the radio wave transmitter 4 measured at a plurality of times.

  The storage unit 21 can include a semiconductor memory such as a RAM (Random Access Memory), a ROM (Read Only Memory), and an EPROM (Erasable Programmable ROM). The storage unit 21 may include any type of storage device such as a flash memory, a magnetic storage device, or an optical storage device.

  The wireless communication unit 22 performs wireless communication with the authentication device 3. Further, the wireless communication unit 22 receives a radio wave transmitted from the radio wave transmitter 4. As the wireless communication unit 22, for example, a wireless module having a wireless communication interface such as BLE, ZigBee, or Wi-fi is used. When the wireless module used for wireless communication between the wireless communication unit 22 and the authentication device 3 and the wireless module used for receiving the radio wave from the radio wave transmitter 4 are the same, In order to distinguish, identification information may be included in each radio wave. In this case, the wireless communication unit 22 receives the wireless signal from the authentication device 3 only when the identification information included in the wireless signal transmitted from the authentication device 3 matches the identification information stored in the storage unit 21 in advance. To do. The wireless communication unit 22 measures the radio wave received from the radio wave transmitter 4 only when the identification information included in the radio wave transmitted from the radio wave transmitter 4 matches the identification information stored in the storage unit 21 in advance. To do.

  The motion detection unit 23 detects the movement of the portable terminal 2 based on the position, speed, acceleration, or the like of the portable terminal 2 and outputs detection information indicating the magnitude of the detected movement. As the motion detection unit 23, for example, an indoor positioning system such as a GPS (Global Positioning System), a gyro sensor, an acceleration sensor, or an IMES (Indoor Messaging System) included in the mobile terminal 2 is used.

  The display unit 24 is a display device such as a liquid crystal panel or an organic EL display. For example, the display unit 24 displays information received from the authentication device 3 on the display device and notifies the user 7.

  FIG. 2B shows the configuration of the authentication device 3. The authentication device 3 includes a control unit 30, a storage unit 31, a wireless communication unit 32, an electric lock control unit 33, and a management device communication unit 34.

  The control unit 30 is a processor such as a CPU that executes a program recorded in the storage unit 31 and performs control and calculation of the authentication device 3. The control unit 30 includes an authentication unit 35, a signal strength measurement unit 37, and a proximity determination unit 38.

  The storage unit 31 stores a program for controlling and calculating the authentication device 3 executed by the control unit 30. The storage unit 31 stores in advance ID information of the user 7 who owns the mobile terminal 2, identification information of the mobile terminal 2, and the like. Further, the storage unit 31 may store entry record information indicating that the user 7 has been allowed to enter. The storage unit 31 can include a semiconductor memory such as a RAM, a ROM, and an EPROM. The storage unit 31 may include any type of storage device such as a flash memory, a magnetic storage device, or an optical storage device.

  The wireless communication unit 32 performs wireless communication with the mobile terminal 2. As the wireless communication unit 32, for example, a wireless module having a wireless communication interface such as BLE, ZigBee, or Wi-fi is used. The wireless communication unit 32 receives the wireless signal from the portable terminal 2 only when the identification information included in the wireless signal transmitted from the portable terminal 2 matches the identification information stored in the storage unit 31 in advance. May be.

  The electric lock control unit 33 is connected to the electric lock of the door 6 wirelessly or by wire, and has an interface circuit that controls the locking and unlocking of the electric lock of the door 6. The wireless communication unit 32 may be used for communication between the electric lock control unit 33 and the electric lock of the door 6.

  The management device communication unit 34 includes a communication interface circuit that is connected to the management device 5 wirelessly or by wire via a local network, a wide area network, or the like and communicates with the management device 5. Note that the wireless communication unit 32 may be used instead of the management device communication unit 34 for communication between the authentication device 3 and the management device 5.

  FIG. 2C shows the configuration of the radio wave transmitter 4. The radio wave transmitter 4 includes a control unit 40, a storage unit 41, and a wireless communication unit 42.

  The control unit 40 is a processor such as a CPU that executes a program recorded in the storage unit 41 and controls and calculates the radio wave transmitter 4. The control unit 40 has radio wave transmission means 45.

  The storage unit 41 stores a program for controlling and calculating the radio wave transmitter 4 executed by the control unit 40. The storage unit 41 stores in advance identification information and the like of the radio wave transmitter 4 included in the radio wave transmitted by the wireless communication unit 42. The storage unit 41 can include a semiconductor memory such as a RAM, a ROM, and an EPROM. The storage unit 41 may include any type of storage device such as a flash memory, a magnetic storage device, or an optical storage device.

  The wireless communication unit 42 transmits radio waves toward the door 6. As the wireless communication unit 42, for example, a wireless module having a wireless communication interface such as BLE, ZigBee, or Wi-fi is used. The frequency of the radio wave transmitted by the wireless communication unit 42 is preferably large enough that the radio wave is not easily diffracted by the user 7 body, and the intensity of the transmitted radio wave passes through the user 7 body. It is preferable to be strong enough. The frequency of such a radio wave can be, for example, an ultra high frequency wave, a microwave, a millimeter wave, or a submillimeter wave, and in particular, can be 2.4 GHz that is a frequency of a BLE beacon.

  Moreover, although it is preferable that the radio wave transmitted by the wireless communication unit 42 has directivity so as to be output only in a range around the door 6, it is not limited thereto. For example, the radio wave transmitted by the wireless communication unit 42 may be output spatially isotropically.

  The radio wave transmission means 45 controls the radio communication unit 42 to periodically transmit radio waves toward the door 6. The radio wave transmission cycle is preferably short enough to determine that the user 7 is facing the door 6, but if the radio wave transmission cycle is too short, the power consumption of the radio wave transmitter 4 increases. Therefore, the radio wave transmission period is preferably 0.1 seconds to 10 seconds. Further, the radio wave transmitted by the radio wave transmitter 4 may include identification information unique to the radio wave transmitter 4, position information where the radio wave transmitter 4 is arranged, and the like.

  FIG. 3 is a flowchart showing processing of the mobile terminal 2. The flowchart shown in FIG. 3 may be executed every time a radio wave is received from the radio wave transmitter 4 or may be executed at a predetermined cycle.

  First, the stationary determination unit 28 acquires detection information from the motion detection unit 23, and the user 7 holding the mobile terminal 2 is stationary based on the magnitude of the movement of the mobile terminal 2 indicated by the acquired detection information. It is determined whether or not (step S31). For example, the stationary determination unit 28 determines that the user 7 is stationary when a state in which the magnitude of the movement of the mobile terminal 2 is equal to or less than a predetermined threshold continues for a certain period of time. The stationary state determined by the stationary determination unit 28 refers to a state in which the user 7 is not walking, and includes a state in which the user 7 has stopped, a state in which walking has been gradually slowed, and is about to stop. The length of the fixed time can be set to 0.5 second to 2 seconds, for example.

  The stationary determination unit 28 repeats the stationary determination until it is determined that the user 7 is stationary. Thereby, since the process after step S32 is performed only when it determines with the user 7 being still, the power consumption of the portable terminal 2 is suppressed. Note that the stillness determination in step S31 is not essential and can be omitted.

  Next, the measuring means 25 measures the radio wave intensity of the radio wave received from the radio wave transmitter 4 via the wireless communication unit 22, and stores the measured radio wave intensity in the storage unit 21 (step S32). Since radio waves are periodically transmitted from the radio wave transmitter 4, the wireless communication unit 22 may receive the radio waves a plurality of times. Further, the measuring means 25 may measure the radio wave intensity for radio waves received a plurality of times, and may use the average value or representative value of the radio wave intensity as a measurement result.

  Next, the determination means 26 determines whether the user 7 located in a predetermined space is facing the door 6 based on the received radio wave intensity (step S33). For example, the determination unit 26 determines that the user 7 is facing the door 6 when the measured radio wave intensity is equal to or less than a predetermined threshold, and otherwise the user 7 is not facing the door 6. Is determined. Note that the determination unit 26 determines that the user 7 is facing the door 6 when the measured radio wave intensity decreases by a predetermined change width or more within a predetermined period, and otherwise the user 7 You may determine with not facing the door 6. FIG. In addition, the determination unit 26 determines that the user 7 is facing the door 6 when the radio wave intensity is equal to or less than a predetermined threshold value and the radio wave intensity has decreased by a predetermined change width within a predetermined period. Otherwise, it may be determined that the user 7 is not facing the door 6.

  When the determination unit 26 determines that the user 7 is facing the door 6 (“Yes” in step S33), the control unit 20 regards the user 7 as an authenticator and performs processing. Control goes to step S34. On the other hand, when it is not determined that the user 7 is facing the door 6 (“No” in step S33), the control unit 20 ends the process.

  Next, the transmission unit 27 transmits an authentication request signal including the ID information of the user 7 to the authentication device 3 (step S34). In the case of FIG. 1, the user 7 a determined to be facing the door 6 is determined to be an authenticator who has an intention to pass through the door 6, and is transmitted from the transmission means 27 of the mobile terminal 2 possessed by the user 7 a. An authentication request signal is transmitted to the authentication device 3. On the other hand, the user 7b who is not determined to be facing the door 6 is determined not to be an authenticator who needs to pass through the door 6, and the authentication request signal is not transmitted from the transmission means 27 of the portable terminal 2.

  After that, when the authentication device 3 receives the authentication request signal and transmits a passage permission signal indicating that the passage of the door 6 is permitted to the portable terminal 2, the control unit 20 transmits the passage permission signal via the wireless communication unit 22. Is received (step S35).

  Next, the control unit 20 notifies the user 7 that the passage of the door 6 is permitted by displaying characters on the display unit 24 or making a sound (step S36), and ends the process.

  FIG. 4 is a flowchart showing processing of the authentication device 3. The flowchart shown in FIG. 4 may be executed every time a signal is received from the mobile terminal 2 or may be executed at a predetermined cycle.

  First, the control unit 30 receives an authentication request signal from the mobile terminal 2 via the wireless communication unit 32 (step S41).

  Next, the signal strength measuring means 37 measures the signal strength of the received authentication request signal (step S42).

  Next, the proximity determination means 38 determines whether or not the user 7 exists in the vicinity of the door 6 based on the measured signal strength (step S43). For example, the proximity determination unit 38 determines that the user 7 is within a certain range from the authentication device 3 when the measured signal strength is equal to or greater than a predetermined threshold. Here, the predetermined threshold is set in advance as the signal strength when the distance between the mobile terminal 2 and the authentication device 3 is, for example, 1 to 2 m.

  When it is determined that the user 7 is present near the door 6 (“Yes” in step S43), the control unit 30 proceeds to step S44. On the other hand, when it is not determined that the user 7 exists in the vicinity of the door 6 (“No” in step S43), the control unit 30 ends the process. Note that the proximity determination in step S43 is not essential and can be omitted.

  Next, the authentication means 35 performs the authentication process of the user 7 by comparing the ID information included in the received authentication request signal with the ID information stored in advance in the storage unit 31 (step S44). The authentication unit 35 has the intention of the user 7 to pass through the door 6 when the ID information of the user 7 included in the authentication request signal matches any of the ID information registered in the storage unit 31 in advance. It is determined that the user is a legitimate user, and it is determined that the authentication is successful. On the other hand, the authentication unit 35 determines that the user 7 is not a valid user when the ID information of the user 7 included in the authentication request signal does not match any of the ID information registered in the storage unit 31 in advance. It is determined that the authentication has failed.

  When it is determined that the authentication is successful (“Yes” in step S44), the control unit 30 permits the user 7 to pass through the door 6 (step S45). On the other hand, when it is determined that the authentication has failed (“No” in step S44), the control unit 30 ends the process.

  Next, the control unit 30 transmits an unlock signal to the door 6 via the electric lock control unit 33 (step S46), and unlocks the electric lock of the door 6 for a certain period. And the control part 30 transmits the passage permission signal which shows having permitted passage of the door 6 with respect to the user 7 to the portable terminal 2 via the wireless communication part 32 (step S47).

  Next, the control unit 30 transmits an entrance record signal indicating that the user 7 has entered the security area to the management device 5 by permitting the user 6 to pass through the door 6 via the management device communication unit 34. (Step S48). This entrance record signal includes the ID information of the user 7. The management device 5 adds area information and time information to the admission record information received from the authentication device 3 and registers them in the database. The entry record information may be transmitted to the management device 5 every time the user 7 enters the security area, or may be transmitted collectively.

  FIG. 5 is a diagram for explaining the radio wave intensity of the radio wave received from the radio wave transmitter 4 measured by the mobile terminal 2. FIG. 5A shows a user 7a who is going to enter the security area from a public area and a user 7b who has just passed in front of the door 6. FIG. FIG. 5B shows a radio wave intensity measurement waveform 401 measured by the mobile terminal 2a possessed by the user 7a, and a radio wave intensity measurement waveform 402 measured by the mobile terminal 2b possessed by the user 7b. It is a graph which shows. The vertical axis in FIG. 5 (b) indicates the radio wave intensity received by the mobile terminals 2a and 2b, and the horizontal axis in FIG. 5 (b) indicates time.

  The user 7a who intends to pass through the door 6 moves toward the door 6 from the position P0 on the left side in the drawing at time T0. At this time, the measurement waveform 401 of the radio wave intensity measured by the mobile terminal 2a gradually increases as the user 7a approaches the radio wave transmitter 4. Thereafter, at time T <b> 1, the user 7 a rotates the body at the position P <b> 1 in front of the door 6 and faces the door 6. At this time, the radio wave intensity measured by the mobile terminal 2a is rapidly reduced to be equal to or less than a predetermined threshold value VTh. For example, according to an experiment performed for the present invention, 2.4 GHz radio waves from the radio wave transmitter 4 are absorbed by the body of the user 7a and attenuated by about 15 to 30 dB.

  On the other hand, the user 7b who does not intend to pass through the door 6 moves from the position P0 on the left side in the drawing toward the position P2 in front of the door 6 at time T0. At this time, the measurement waveform 402 of the radio wave intensity measured by the mobile terminal 2b gradually increases as the user 7b approaches the radio wave transmitter 4. Thereafter, at time T2, the user 7b passes the position P2 in front of the door 6 and moves to the right position P3 in the figure at time T3. At this time, the radio wave intensity measured by the portable terminal 2 b gradually decreases as the user 7 b moves away from the radio wave transmitter 4.

  As described above, the measurement waveform 401 by the mobile terminal 2a is equal to or lower than the threshold value VTh when the user 7a faces the door 6 in the wireless communication area in which the wireless communication between the mobile terminal 2 and the authentication device 3 is possible. The measurement waveform 402 by the portable terminal 2b does not become the threshold value VTh or less. The radio wave intensity measured at the portable terminal 2 is equal to or less than the threshold value VTh when the user 7a is viewed from the position of the radio wave transmitter 4 as when the user 7a is facing the door 6. Only if it is completely obscured by the body. Therefore, the portable terminal 2 can determine that the user 7a is facing the door 6 when the measured radio field intensity is equal to or less than a predetermined threshold, and the user 7a intends to pass through the door 6. It can be determined that the user is an authenticator requiring authentication.

  Here, when the mobile terminal 2 is held at a position away from the body of the user 7a, even when the user 7a faces the door 6, when viewed from the position of the radio wave transmitter 4. The portable terminal 2 is not completely obscured by the body of the user 7a. Therefore, it is preferable that the portable terminal 2 is held in contact with the front surface of the user 7a.

  When the wireless communication area between the portable terminal 2 and the authentication device 3 is as wide as or more than the reach of the radio wave transmitted from the radio wave transmitter 4, the position P3 shown in FIG. As described above, the measurement waveform 402 by the portable terminal 2b may be equal to or lower than the threshold value VTh. Therefore, in such a case, it is preferable to determine whether or not the user 7a is facing the door 6 by combining other conditions.

  Therefore, as shown in FIG. 5B, the mobile terminal 2 has a measured radio wave intensity that is equal to or less than a predetermined threshold value, and the radio wave intensity has decreased by a predetermined change width ΔV within a predetermined period ΔT. In this case, it is determined that the user 7a is facing the door 6. As described above, the radio wave intensity measured by the mobile terminal 2 decreases rapidly when the mobile terminal 2 is viewed from the position of the radio wave transmitter 4 as when the user 7a faces the door 6. Only when completely covered by the body of the user 7a.

  Here, the predetermined period ΔT is set retroactively from the time when the radio wave intensity measured by the mobile terminal 2 becomes equal to or less than a predetermined threshold. Alternatively, the predetermined period ΔT may be set retroactively from the time when the stillness determination or the proximity determination is performed, or may be set retroactively from the time when the measured radio wave intensity starts to decrease.

  As described above, the mobile terminal 2 determines whether the user 7 is facing the authentication target based on the radio wave intensity of the radio wave transmitted from the radio wave transmitter 4. The authentication request signal is transmitted to the authentication device 3 only when it is determined that the user 7 is suitable for the authentication object. Since the user 7 determined to be suitable for the authentication object in this way is likely to have an intention to use the authentication object, the mobile terminal 2 increases the authentication accuracy of the user 7. Can be improved.

  Further, the mobile terminal 2 has a signal intensity of a radio wave received by the mobile terminal 2 from the radio wave transmitter 4 that is equal to or lower than a predetermined radio wave intensity threshold value and an authentication request signal received by the authentication device 3 from the mobile terminal 2. When the strength is equal to or greater than a predetermined threshold, it can be determined that the user 7 is facing the authentication target near the authentication target.

  Note that either the mobile terminal 2 or the authentication device 3 may perform the stillness determination shown in FIG. 3 or the proximity determination shown in FIG. When the proximity determination is performed by the mobile terminal 2, the mobile terminal 2 includes a proximity determination unit. The authentication device 3 transmits a radio signal to the mobile terminal 2, and the proximity determination unit of the mobile terminal 2 determines whether the user 7 exists in the vicinity of the door 6 based on the signal strength obtained by measuring the transmitted radio signal. Determine whether or not. Further, when the stillness determination is performed by the authentication device 3, the authentication device 3 includes a stillness determination unit. The mobile terminal 2 transmits the detection information to the authentication device 3, and the stationary determination unit of the authentication device 3 is based on the magnitude of the movement of the mobile terminal 2 indicated by the detection information transmitted from the mobile terminal 2. It is determined whether or not the user 7 holding 2 is stationary.

  The proximity determination may be performed before the facing determination as to whether or not the user 7 is facing the door 6 or may be performed after the facing determination. Similarly, the stillness determination may be performed before the facing determination or may be performed after the facing determination. In addition, the determination results of the proximity determination, the stillness determination, and the facing determination may be transmitted and received together in one signal between the mobile terminal 2 and the authentication device 3, or may be transmitted and received separately in a plurality of signals. Good. In any case, the authentication device 3 executes the authentication process of the user 7 when the authentication request signal is received from the mobile terminal 2 and all necessary determination conditions are satisfied.

  In FIG. 3, the authentication system 1 determines whether or not the user 7 is facing the door 6 based on the reception intensity of the radio wave received by the mobile terminal 2 from the radio wave transmitter 4, and issues an authentication request. Although the signal is transmitted, the present embodiment is not limited to this. For example, the authentication system 1 may transmit the authentication request signal based on the proximity determination as to whether or not the user 7 exists in the vicinity of the door 6 in addition to the facing determination. In this case, the mobile terminal 2 uses the user 7 when the radio wave intensity from the radio wave transmitter 4 is equal to or lower than a predetermined radio wave intensity threshold value and the radio signal strength is equal to or higher than the predetermined signal intensity threshold value. Determines that it faces the door 6 near the door 6 and transmits an authentication request signal.

  Further, the authentication system 1 may transmit an authentication request signal based on a stationary determination as to whether or not the user 7 is stationary in addition to the facing determination. In this case, when the mobile terminal 2 determines that the radio wave intensity from the radio wave transmitter 4 is equal to or less than a predetermined threshold and the user 7 is stationary, the user 7 faces the door 6. It determines that it is stationary and transmits an authentication request signal.

  Further, the authentication request signal may be transmitted by combining a plurality of methods described above. By combining a plurality of conditions in this way, it can be determined with higher accuracy whether or not the user 7 has an intention to pass through the door 6. Further, the user 7 who has the portable terminal 2 on the security area side on the back side of the door 6 can similarly determine whether or not the user 7 passes just in front of the door 6, so-called Backreading can be suppressed.

  The above-described embodiments are merely examples of implementation in carrying out the present invention, and the technical scope of the present invention should not be construed as being limited thereto. That is, the present invention can be implemented in various forms without departing from the technical idea or the main features thereof.

  For example, the authentication system 1 can determine not only whether the user is facing the door, but can also determine whether the user is facing a terminal device such as a cash register or a vending machine, for example. It is.

  When the authentication device authenticates a user who wants to purchase a product hands-free, if there are multiple users with portable terminals around the cash register or vending machine, the authentication device will identify which user It is impossible to determine whether or not a purchase has been made, and payment cannot be made. Even in such a case, the authentication system 1 can determine whether or not the user is suitable for a cash register or a vending machine by a similar method.

  Since the user who is determined to be suitable for the cash register or the vending machine in this way is likely to have an intention to use the authentication object, according to the authentication system 1, the user's Authentication accuracy can be improved.

  DESCRIPTION OF SYMBOLS 1 Authentication system 2, 2a, 2b Portable terminal, 3 Authentication apparatus, 4 Radio wave transmitter, 5 Management apparatus, 6 Door, 7, 7a, 7b User, 20 Control part, 21 Storage part, 22 Wireless communication part, 23 Motion detection unit, 24 display unit, 25 measurement unit, 26 determination unit, 27 transmission unit, 28 stationary determination unit, 30 control unit, 31 storage unit, 32 wireless communication unit, 33 electric lock control unit, 34 management device communication unit, 35 authentication means, 37 signal strength measurement means, 38 proximity determination means, 40 control section, 41 storage section, 42 wireless communication section, 45 radio wave transmission means, 401 measurement waveform, 402 measurement waveform.

Claims (7)

An authentication system comprising a radio wave transmitter, a portable terminal held on the front of a user's body, and an authentication device,
The radio wave transmitter is
A radio wave transmitting means arranged to face the authentication object across a predetermined space, and to transmit a radio wave toward the authentication object;
The portable terminal is
Measuring means for measuring the radio field intensity of the radio wave received from the radio wave transmitter;
Determination means for determining whether the user located in the predetermined space is facing the authentication object based on the radio field intensity;
A transmission means for transmitting an authentication request signal including ID information of the user to the authentication device when it is determined that the user is suitable for the authentication object;
The authentication device
A storage unit for storing ID information of the user;
Authentication for executing authentication processing of the user by comparing the ID information included in the authentication request signal with the ID information stored in advance in the storage unit when the authentication request signal is received from the portable terminal Means.
An authentication system characterized by that.   The authentication system according to claim 1, wherein the determination unit determines that the user is facing the authentication object when the radio wave intensity is equal to or less than a predetermined threshold.   3. The authentication system according to claim 1, wherein the determination unit determines that the user is facing the authentication object when the radio wave intensity decreases by a predetermined change width or more within a predetermined period. . The authentication device is attached to the authentication object,
One of the mobile terminal and the authentication device transmits a radio signal to the other of the mobile terminal and the authentication device,
The other further includes proximity determining means for determining whether or not the portable terminal is present in the vicinity of the authentication object based on the signal strength of the radio signal received from the one;
4. The authentication unit according to claim 1, wherein the authentication unit executes the authentication process when it is determined that the mobile terminal is present in the vicinity of the authentication target and the authentication request signal is received from the mobile terminal. The authentication system described in the section. The portable terminal is
A motion detector for detecting the movement of the mobile terminal;
Stillness determination means for determining whether or not the user is walking based on the magnitude of movement of the mobile terminal detected by the motion detection unit,
The authentication according to any one of claims 1 to 4, wherein the authentication means executes the authentication process when it is determined that the user is not walking and the authentication request signal is received from the mobile terminal. system. The authentication object is a regulation means for physically regulating movement from the first space to the second space,
The authentication system according to any one of claims 1 to 5, further comprising a restriction release unit that releases the restriction when the authentication unit determines that the authentication is successful. A mobile device held in front of the user ’s body,
A measuring means for measuring the radio wave intensity of a radio wave transmitted toward the authentication target from a radio wave transmitter disposed opposite to the authentication target across a predetermined space;
Determination means for determining whether the user located in the predetermined space is facing the authentication object based on the radio field intensity;
When it is determined that the user is suitable for the authentication object, a transmission unit that transmits an authentication request signal including the ID information of the user to an authentication device;
Mobile terminal having.