JP5994236B2 - Entrance / exit management device - Google Patents

Description

  The present invention relates to an entry / exit management device.

  As a reader of an entrance / exit management device, one having two transmission antennas has been proposed. According to the entry / exit management device, the entry and exit of the user carrying the identifier is determined by identifying the transmitting antenna from which the identifier is responded to by identifying the identifier (for example, , See Patent Document 1).

JP 2004-227315 A

  However, the entrance / exit management device requires not only two transmission antennas but also a circuit for switching between these transmission antennas.

  This invention was made in order to solve the above-mentioned subject, and the objective is to provide the entrance / exit management apparatus which can discriminate | determine a user's entrance and exit by one transmission antenna.

The entrance / exit management device according to the present invention is provided above the wall on the management area side above the entrance / exit formed on the wall that partitions the management area and the outside, and in the width direction of the entrance / exit above the entrance / exit. A reader having one transmission antenna and a reception antenna for transmitting radio waves radially from the center, and an electric field strength sensor, receiving the radio waves transmitted by the transmission antenna, and measuring the electric field strength of the radio waves with the electric field strength sensor And the time of the detected value of the electric field strength calculated from the radio wave when the receiving antenna receives the radio wave transmitted by the discriminator. based on the change, and a controller for discriminating between leaving and entering of the identification member with respect to the management area, the external side of the reader, the one transmission antenna The magnetic flux density by radio waves but to be transmitted, due to the influence of the wall, in which the decrease more rapidly than the management area side moves away from the reader.

  According to the present invention, it is possible to determine whether a user enters or leaves a single transmission antenna.

It is a block diagram of the entrance / exit management apparatus in Embodiment 1 of this invention. It is a figure for demonstrating the characteristic of the LF radio wave which the transmitting antenna of the reader | leader of the entrance / exit management apparatus in Embodiment 1 of this invention transmits. It is a flowchart for demonstrating operation | movement of the entrance / exit management apparatus in Embodiment 1 of this invention.

  A mode for carrying out the invention will be described with reference to the accompanying drawings. In addition, in each figure, the same code | symbol is attached | subjected to the part which is the same or it corresponds, The duplication description is simplified or abbreviate | omitted suitably.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram of an entrance / exit management device according to Embodiment 1 of the present invention.

  In FIG. 1, 1 is a passage in a building. The passage 1 is formed so as to be connected to each management area in the building. 2 is a living room. The living room 2 is partitioned from the outside such as the passage 1 through the wall 3 as a management area in the building. The wall 3 is formed of a material that transmits LF radio waves.

  An entrance / exit 4 is formed in a part of the wall 3. The entrance / exit 4 is formed so as to penetrate the passage 1 and the living room 2. A door 5 is provided at the doorway 4. The door 5 is formed of a material that transmits LF radio waves. The door 5 is provided so as to open and close the doorway 4.

  Above the entrance / exit 4, the reader 6 is provided closer to the living room 2 than the wall 3. The reader 6 has a transmission antenna 6a and a reception antenna 6b. The transmission antenna 6a has a function of transmitting LF radio waves radially up to a predetermined distance. The receiving antenna 6b has a function of receiving RF radio waves.

  Reference numeral 7 denotes a tag (identifier). The tag 7 has a function of receiving LF radio waves. The tag 7 has a function of transmitting RF radio waves. The tag 7 includes a storage unit 7a and an electric field strength sensor 7b. The storage unit 7a has a function of storing personal information data of a user who carries the tag 7. The electric field strength sensor 7b has a function of detecting the electric field strength of the LF radio wave in a three-dimensional direction (three directions of X, Y, and Z).

  A controller 8 is connected to the reader 6. For example, the controller 8 is provided in the vicinity of the reader 6. The controller 8 includes a storage unit 8a. The storage unit 8a has a function of storing, as a personal information database, personal information data of users who are permitted to enter the living room 2. The controller 8 is connected to the electric lock 5 a of the door 5. The electric lock 5a has a function of opening and closing the key of the door 5.

Next, the characteristics of the LF radio wave transmitted by the transmission antenna 6a will be described with reference to FIG.
FIG. 2 explains the characteristics of the LF radio wave transmitted by the transmission antenna of the reader of the entrance / exit management device according to Embodiment 1 of the present invention. The horizontal axis in FIG. 2 is the distance from the transmitting antenna 6a. The vertical axis in FIG. 2 is the magnetic flux density generated by the transmitting antenna 6a.

  In FIG. 2, LF (inside) is the magnetic flux density on the side of the living room 2. LF (outside) is the magnetic flux density on the passage 1 side. There is no object in the propagation direction of the LF radio wave on the side of the living room 2 from the transmitting antenna 6a. On the other hand, the wall 3 and the door 5 exist in the propagation direction of the LF radio wave on the passage 1 side from the reader 6.

  For this reason, the magnetic flux density by the LF radio wave gradually decreases as the distance from the reader 6 increases on the side of the living room 2 than the transmitting antenna 6a. On the other hand, on the side of the passage 1 relative to the reader 6, the magnetic flux density due to the LF radio wave decreases rapidly as the distance from the reader 6 increases due to the influence of the wall 3 and the door 5.

  That is, on the side of the room 2 from the transmitting antenna 6 a, the electric field strength due to the LF radio wave gradually decreases as the distance from the reader 6 increases. On the other hand, on the side of the passage 1 relative to the reader 6, the electric field strength due to the LF radio wave rapidly decreases as the distance from the reader 6 increases.

Next, operation | movement of an entrance / exit management apparatus is demonstrated using FIG.
FIG. 3 is a flow chart for explaining the operation of the entrance / exit management device according to Embodiment 1 of the present invention.

  When the user carrying the tag 7 approaches the entrance / exit 4, the tag 7 enters the propagation range of the LF radio wave transmitted by the transmission antenna 6a. At this time, the tag 7 receives the LF radio wave transmitted by the transmission antenna 6a. At this time, the electric field strength sensor 7 b detects the electric field strength of the LF radio wave received by the tag 7. Thereafter, the process proceeds to step S1, and the tag 7 transmits an RF radio wave including data in which the personal information data in the storage unit 7a is associated with the detection value of the electric field strength sensor 7b.

  Thereafter, the process proceeds to step S2, and the receiving antenna 6b of the reader 6 receives the RF radio wave transmitted by the tag 7. Thereafter, the reader 6 transmits to the controller 8 personal information data read from the received RF radio wave and data corresponding to the detection value of the electric field strength sensor 7b.

  Then, it progresses to step S3 and the memory | storage part 8a of the controller 8 memorize | stores the personal information data received from the reader 6, and the data of the electric field strength sensor 7b. Thereafter, the process proceeds to step S4, where the controller 8 compares the personal information data from the reader 6 with the personal information database.

  If the personal information data from the reader 6 does not match the personal information data registered in the personal information database, the process returns to step S1. On the other hand, if the personal information data from the reader 6 matches the personal data already registered in the personal information database, the process proceeds to step S5. In step S5, the controller 8 calculates a difference (increase amount) between detection values of the previous and current electric field strength sensors 7b for the personal information data.

  When the difference data is less than the predetermined value, the controller 8 determines that the tag 7 leaves the room. On the other hand, when the difference data is equal to or greater than the predetermined value, the controller 8 determines that the tag 7 enters the room.

  At this time, if the door 5 should not be controlled, the process returns to step S1. On the other hand, when the door 5 may be controlled, the process proceeds to step S6. In step S6, the controller 8 transmits an unlocking signal or the like to the electric lock 5a, and controls the opening and closing of the electric lock 5a. After the control, the process returns to step S1.

  A series of these operations is repeated at predetermined time intervals. That is, the controller 8 determines whether the user enters or leaves the management area based on the difference between the detected values of the electric field strength before and after the predetermined time interval.

  According to the first embodiment described above, the controller 8 determines whether the tag 7 enters or leaves the management area based on a temporal change in the detected value of the electric field strength of the LF radio wave. For this reason, the dynamic management of the user carrying the tag 7 can be performed with one transmission antenna 6a. That is, a user's entry and exit can be determined by a hands-free entry / exit management device using one transmission antenna 6a. As a result, the entrance / exit management device can be made inexpensive and easy to operate.

  Specifically, the controller 8 determines whether the tag 7 enters or leaves the management area based on the difference between the detected values of the electric field strength before and after the predetermined time interval. For this reason, it is possible to determine whether a user enters or leaves a room by a simple calculation. In addition, what is necessary is just to set the predetermined value used as a threshold value at the time of discriminating between entering and leaving a room in consideration of a user's walking speed and the like.

  At this time, if the characteristics of the electric field strength for each reader 6 in each management area are calibrated, it is possible to more accurately determine whether the user enters or leaves the room.

  Note that the reader 6 may be provided closer to the passage 1 than the wall 3. In this case, if the difference between the detection values of the electric field strength sensor 7b is less than a predetermined value, it may be determined that the tag 7 enters the room. On the other hand, if the difference is equal to or greater than the predetermined value, it may be determined that the tag 7 leaves the room. Even in this case, the dynamic management of the user carrying the tag 7 can be performed with one transmission antenna 6a.

  Further, the time taken for the detected value of the electric field intensity sensor 7b to reach the predetermined second threshold after the detection value exceeds the predetermined first threshold is measured by a timer or the like, and the tag 7 enters and leaves the management area. May be determined. Also in this case, it is possible to determine whether a user enters or leaves the room with one transmission antenna 6a.

  Moreover, you may discriminate | determine a user's entrance and exit by using an IC card as an identifier.

1 passage 2 living room 3 wall 4 doorway 5 door 5a electric lock 6 reader 6a transmitting antenna 6b receiving antenna 7 tag 7a storage unit 7b electric field intensity sensor 8 controller 8a storage unit

Claims (3)

One above the entrance / exit formed in the wall which divides the management area and the outside, is provided closer to the management area than the wall, and transmits radio waves radially from the center in the width direction of the entrance / exit above the entrance / exit A reader having a transmitting antenna and a receiving antenna;
An identifier for receiving a radio wave transmitted by the transmitting antenna, detecting an electric field intensity of the radio wave with the electric field intensity sensor, and transmitting a radio wave corresponding to the detected value of the electric field intensity;
When the reception antenna receives a radio wave transmitted by the identifier, it is determined whether the identifier enters or leaves the management area based on a temporal change in the detected value of the electric field intensity calculated from the radio wave. A controller to
Equipped with a,
On the outside side of the reader, the magnetic flux density due to the radio wave transmitted by the one transmitting antenna decreases more rapidly than the management area side as it moves away from the reader due to the influence of the wall. Exit management device. The electric field strength sensor detects the electric field strength of the radio wave transmitted by the transmitting antenna at predetermined time intervals,
The entrance / exit management device according to claim 1, wherein the controller discriminates entry and exit of the identifier from the management area based on a difference between detected values of electric field strength before and after the predetermined time interval. .   The controller discriminates the entry and exit of the identifier from the management area based on the time taken for the detected value of the electric field strength to reach a predetermined second threshold after exceeding a predetermined first threshold. The entrance / exit management device according to claim 1, wherein the entrance / exit management device is provided.

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