JP2009003894A - Entrance/exit management system and entrance/exit management method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an entrance/exit management system and an entrance/exit management method by which whether a management object such as a person or object enters a building or room, or leaves the building or room can be distinguished. <P>SOLUTION: The entrance/exit management system is provided with: an IC tag 1 which is possessed by a staff who passes through a doorway and readably stores a staff number for identifying the staff ; an external antenna 3 which is provided outside the doorway and reads the staff number from the IC tag 1 when there is the IC tag 1 outside the doorway; a second antenna which is provided inside the doorway and reads the staff number from the IC tag 1 when there is the IC tag 1 inside the doorway; a reader 4 which determines entrance/exit of the IC tag 1 with respect to the doorway by difference of reading time of the staff number read by the external antenna 3 and the internal antenna 2; and a management terminal 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an entry / exit management system and an entry / exit management method for managing entry / exit with respect to an entrance / exit of a building or a room using an IC (Integrated Circuit) tag.

The IC tag includes a semiconductor integrated circuit and a small antenna, and information stored in the semiconductor integrated circuit can be read from the IC tag wirelessly. Such IC tags are used for entrance / exit management and gate passage management (see, for example, Patent Document 1). Specifically, a loop-shaped antenna is provided on a door frame surrounding the entrance of a building or room, and this antenna is connected to the read / write unit. The read / write unit outputs an electromagnetic field from the antenna, and reads information stored in the semiconductor integrated circuit of the IC tag. Based on the information read in this way, people and objects entering and leaving buildings and rooms are managed.
JP-A-11-41152

  However, conventional entrance / exit management and gate passage management using IC tags have the following problems. The conventional technology only manages people and things entering and leaving the building and room, and cannot distinguish whether the management target of people or things enters or leaves the building or room. As a result, for example, when a situation such as evacuation from a building or room occurs, it is not possible to check whether or not a person remains in the building or room.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an access control system and an access control method that can solve the above-described problems and make it possible to distinguish whether a management target such as a person or an object enters or exits a building or room. It is to provide.

  In order to solve the above-mentioned problem, the invention of claim 1 is provided in an information medium that is possessed by a management object passing through an entrance and that stores identification information for identifying the management object in a readable manner, and provided outside the entrance and exit. A first antenna that reads identification information from the information medium when the information medium is outside the doorway, and the information medium that is provided inside the doorway and the information medium is inside the doorway A second antenna for reading identification information from the information medium, and processing means for determining whether the information medium enters and exits from the entrance according to a difference in reading time of the identification information read by the first antenna and the second antenna. And an access management system characterized by comprising:

  According to the first aspect of the present invention, the identification information for identifying the management object passing through the doorway is stored in advance so that the information medium can be read. This information medium is affixed to, for example, a pass. The first antenna is provided outside the doorway, and the second antenna is provided inside the doorway. In such a state, the first antenna reads identification information from the information medium when the information medium is outside the doorway, and the second antenna identifies from the information medium when the information medium is inside the doorway. Read information. The processing means determines whether the information medium enters / exits the entrance / exit based on a difference in reading time of the identification information read by the first antenna and the second antenna.

  According to a second aspect of the present invention, in the access control system according to the first aspect, the processing means reads the identification information after the first antenna reads the identification information, and the second antenna reads the identification information. When it is determined that the information medium storing the identification information has passed from the outside to the inside of the doorway, the identification information is read by the first antenna after the second antenna has read the identification information. It is determined that the information medium has passed from the inside to the outside of the doorway.

  According to a third aspect of the present invention, in the access control system according to the first or second aspect, the information medium is an IC tag, and the processing means transmits an electromagnetic field from the first antenna and the second antenna. Thus, the identification information is read from the IC tag.

  The invention according to claim 4 is an entrance / exit management method using an information medium that is possessed by a management object passing through an entrance and stores the identification information for identifying the management object in a readable manner, and is provided outside the entrance / exit. When the information medium is present outside the doorway from the first antenna, the identification information is read from the information medium, and from the second antenna provided inside the doorway, the information medium is located inside the doorway. The identification information is read from the information medium when the information is present, and the entry / exit of the information medium with respect to the entrance / exit is determined based on the reading time of the identification information read by the first antenna and the second antenna. This is an entry / exit management method.

  According to the first and fourth aspects of the present invention, an antenna is provided on each of the inside and outside of the entrance / exit, and the entrance / exit of the information medium with respect to the entrance / exit is determined by the difference in the reading time of the identification information read by the antenna. It is possible to distinguish whether a management object such as a person entering or leaving the building or room.

  According to the invention of claim 2, it is determined whether the management object possessing the information medium enters or leaves the building or room according to the order in which the two antennas read the identification information. It can be simplified.

  According to the invention of claim 3, since the IC tag is used as the information medium, the information medium can be handled easily without using a power source such as a battery.

  Next, an embodiment of the present invention will be described in detail by using as an example a case where a management target entering and exiting a building where a company is located is an employee.

(Embodiment 1)
An access control system according to this embodiment is shown in FIG. The entrance / exit management system of FIG. 1 is installed and used at the entrance of a building. The access management system includes an IC tag 1, an internal antenna 2 and an external antenna 3, a reading device 4, and a management terminal 5. The reading device 4 is connected to the management terminal 5 by a communication line 6.

  The IC tag 1 is affixed to a pass or the like of an employee who enters or exits a building, and one of them is shown in FIG. The IC tag 1 includes an antenna 11 and a control unit 12. The antenna 11 receives an electromagnetic field transmitted from the internal antenna 2 or the external antenna 3. The antenna 11 supplies the received electromagnetic field power to the control unit 12. The control unit 12 is formed of a semiconductor integrated circuit. The control unit 12 has a memory function and stores an employee number, which is employee identification information, in advance. The control unit 12 operates when receiving power supply from the antenna 11, reads out an employee number stored in advance, and transmits the employee number from the antenna 11 by an electromagnetic field.

  As shown in FIG. 2, the internal antenna 2 is attached to the internal wall surface of the entrance / exit of the building 100, and the external antenna 3 is attached to the external wall surface of the entrance / exit of the building 100. A door 101 is installed on the frame 100A at the entrance of the building 100. Since the internal antenna 2 is attached to the inner wall surface of the building 100, the electromagnetic field is transmitted to and received from the IC tag 1 inside the building 100, and the external antenna 3 is attached to the outer wall surface of the building 100. The electromagnetic field is transmitted / received to / from the IC tag 1 outside the building 100. Transmission / reception of electromagnetic fields by the internal antenna 2 and the external antenna 3 is performed under the control of the reading device 4.

  The reading device 4 is attached to the vicinity of the entrance / exit of the building 100 and to the inner wall surface of the building 100 (FIG. 2). The reading device 4 includes a control unit 41 and a communication unit 42. The control unit 41 has a memory function and stores antenna identification information for identifying the internal antenna 2 and the external antenna 3. This antenna identification information is shown in FIG. In the antenna identification information of FIG. 3, an antenna number is used to identify each antenna. For example, the antenna number “10010” is assigned to the internal antenna 2, and the antenna number “10020” is assigned to the external antenna 3, for example. ing. Hereinafter, the antenna identification information of FIG. 3 is used.

  The control unit 41 transmits an electromagnetic field from the internal antenna 2 and the external antenna 3 in order to read the identification information from the IC tag 1. Further, when the internal antenna 2 or the external antenna 3 receives the employee number by the electromagnetic field, the control unit 41 generates the detection information by adding the antenna number (FIG. 3) of the antenna that has received the employee number to the employee number, This detection information is sent to the communication unit 42. The communication unit 42 performs data transmission with the management terminal 5 via the communication line 6. When receiving the detection information from the control unit 41, the communication unit 42 transmits the detection information to the management terminal 5.

  The management terminal 5 is installed in, for example, a management room of the building 100 and used by an administrator. The management terminal 5 includes a processing unit 51, a communication unit 52, an input unit 53, a storage unit 54, a display unit 55, and a clock unit 56. The communication unit 52, the input unit 53, the storage unit 54, the display unit 55, and the clock unit 56 are connected to the processing unit 51 via a bus 57. The input unit 53 is a device such as a keyboard and a mouse operated by an administrator. In the input unit 53, an instruction for displaying the entry / exit state of the employee is input. The display unit 55 is a display device that displays the entry / exit state of the management subject under the control of the processing unit 51. The communication unit 52 is connected to the communication unit 42 of the reading device 4 via the communication line 6. When receiving the employee number from the reading device 4, the communication unit 52 sends this employee number to the processing unit 51. The clock unit 56 measures time.

  The storage unit 54 stores various types of information necessary for access management, and has a temporary storage area for temporarily storing information. This temporary storage area is for recording the detection information received from the processing unit 51, and this temporary storage area is shown in FIG. In the temporary storage area of FIG. 4, a “registration number” is recorded as a number assigned in the order in which the detection information is received, and the first received detection information is recorded in “first reception”. That is, the employee number and the antenna number of the detection information are recorded in the “employee number” and the “antenna number”, respectively. Further, the time when the detection information is received is recorded in the “reception time”. Next, when the employee number of the detection information received by the processing unit 51 is the same as the employee number of “first reception”, this detection information is recorded in “post-reception”. That is, the antenna number of the detection information received by the processing unit 51 is recorded in the “antenna number” of “post-reception”. The time when the detection information is received is recorded in the “reception time” of “post-reception”. In this way, the registration information including the information of “previous reception” and the information of “post reception” is recorded in the order of the “registration number”. When the contents of the registration information are recorded in the access management information described later, “referenced” is set to “1” and a flag is set.

  The storage unit 54 stores, as employee information, information related to employees who are managed to enter and exit. This employee information is shown in FIG. In the employee information of FIG. 5, the identification number is recorded as “employee number” as the identification information of each employee, and the detailed information of the employee is recorded in “name”, “address”, “age”, “affiliation”, etc. Yes.

  The storage unit 54 stores the entry / exit of the management target employee to / from the building 100 as entry / exit management information. This access management information is shown in FIG. The entry / exit management information in FIG. 6 is created every day and accumulated in the storage unit 54. In the entry / exit management information of FIG. 6, the identification number of each employee is recorded in “employee number”, and the detailed information of the employee is recorded in “name” and “affiliation”. In addition, in the entrance / exit management information, when an employee enters the building 100 from the entrance on the same day, “entrance / exit” is set to “1” and a flag is set, and the time when the building 100 is entered is recorded in the “entry time”. . Further, when the employee goes out of the entrance of the building 100 on the same day, “entrance / exit” is set to “0”, the flag is removed, and the time when the employee leaves the building 100 is recorded in the “departure time”.

  The processing unit 51 performs a reception process using the detection information, and thereafter performs an entry / exit management process using the registration information of the temporary storage area created by the reception process. When starting the reception process, the processing unit 51 waits for detection information to be input from the reading device 4 via the communication unit 52 as shown in FIG. 7 (step S1). When the processing unit 51 receives the detection information from the communication unit 52 (step S2), the processing unit 51 adds the time measured by the clock unit 56 to the detection information (step S3), and sets the “first reception” in the virtual storage area (FIG. 4). Detection information is registered (step S4). As a result, the employee number of the detection information is recorded in the “employee number” of “first reception”, and the antenna number of the detection information is recorded in the “antenna number” of “first reception”. Further, the time measured by the clock unit 56 is registered in the “reception time” of “first reception”.

  After step S4, the processing unit 51 waits for detection information to be input from the reading device 4 via the communication unit 52 as in step S1 (step S5). When receiving the detection information from the communication unit 52 (step S6), the processing unit 51 adds the time measured by the clock unit 56 to the detection information (step S7). Thereafter, the processing unit 51 compares the employee number of the detection information received in step S6 with the employee number registered in the “first reception” in the virtual storage area (FIG. 4) (step S8). It is determined whether or not the employee number of the detection information received in (1) has been registered in “first received” (step S9). When the employee number of the detection information received in step S6 has already been registered in “first reception”, the processing unit 51 registers the detection information in “post-reception” of the same employee number in the virtual storage area (FIG. 4) ( Step S10).

  After step S10, if there is no processing end instruction from the input unit 53, the processing unit 51 returns the processing to step S1 (step S11). If there is an instruction to end the process in step S11, the processing unit 51 ends the reception process.

  When registering detection information in the virtual storage area (FIG. 4) in the reception process, the processing unit 51 performs an entry / exit management process. When the entry / exit management process is started, the processing unit 51 reads the registration information of the young number in which the “referenced” flag is not set in the virtual storage area (FIG. 4), as shown in FIG. 8 (step S21). . Thereafter, the processing unit 51 compares the antenna number of “previous reception” with the antenna number of “post reception” (step S22), and determines whether the antenna number of “previous reception” is large (step S23). . If the “previous reception” antenna number is large in step S23, the processing unit 51 sets “entrance / exit” in the entry / exit management information (FIG. 6) to “1” and sets a flag to record that the employee has entered the building 100. The detection information is registered in the entry / exit management information (FIG. 6), and a flag is set by setting “referenced” in the virtual storage area to “1” (step S24). As a result, the employee number of the detection information is recorded in the “employee number” of the access management information, and the reception time of “post-reception”, for example, in the virtual storage area is recorded in the “entry time” of the access management information (FIG. 6). .

  After step S24, the processing unit 51 refers to the employee information (FIG. 5) using the employee number, and adds detailed information of the corresponding employee to the access management information (FIG. 6) (step S25). As a result, detailed information such as the name and affiliation of the employee is recorded in “name” and “affiliation”. After step S25, the processing unit 51 refers to the virtual storage area (FIG. 4) (step S26), and the presence / absence of the next registration information in which the “referenced” flag of the virtual storage area (FIG. 4) is not set. Is determined (step S27). The next registration information that is not flagged in step S27 is read (step S28), and the process returns to step S22.

  On the other hand, when the antenna number of “previous reception” is smaller than the antenna number of “rear reception” in step S23, the processing unit 51 records the employee number recorded in “employee number” in the virtual storage area (FIG. 4). The same number is retrieved from the entry / exit management information (FIG. 6) (step S29), the entry / exit of the corresponding number in the entry / exit management information (FIG. 6) is set to “0” and the flag is lowered (step S30). As a result, the entry / exit management information (FIG. 6) records that the corresponding employee has exited from the entrance of the building 100. For example, the reception time of “post-reception” in the virtual storage area (FIG. 4) becomes “departure time”. To be recorded.

  On the other hand, if there is no registration information in step S27, the processing unit 51 ends the process.

  The processing unit 51 performs a deletion process when the information in the virtual storage area (FIG. 4) is only “previous reception” and there is no “post-reception” information. That is, when the deletion process is started, the processing unit 51 refers to the clock unit 56, and when a predetermined time has elapsed from the “reception time” of “previous reception”, the information stored only in the “previous reception” is virtually stored. Delete from the region (FIG. 4).

  Next, the operation of the access management system according to this embodiment will be described. Here, as shown in FIG. 9, at approximately the same time, the employee with the employee number “A00001” exits from the entrance of the building 100, and the employee with the employee number “A00002” enters the entrance through the entrance of the building 100. The case where the employee “A00003” went to the door 101 and turned back will be described as an example. In this case, since the employee with the employee number “A00001” and the employee with the employee number “A00003” are in the building 100, the access management information is in the state shown in FIG. 10, for example. In the entry / exit management information of FIG. 10, the information of the employee with the employee number “A00002” is not recorded.

  When an employee with employee number “A00002” (FIG. 9) wants to enter the building 100, the control unit 41 of the reading device 4 is pasted on the passport by the external antenna 3 attached to the outer wall of the entrance of the building 100. The employee number “A00002” is read from the IC tag. The control unit 41 adds the antenna number “10020” of the external antenna 3 to the read employee number “A00002” to generate detection information, controls the communication unit 42, and transmits the detection information to the management terminal 5. Almost at the same time, when the employee of employee number “A00001” is going to leave the building 100, the control unit 41 of the reading device 4 is pasted on the passage card by the internal antenna 2 attached to the inner wall of the entrance of the building 100. The employee number “A00001” is read from the IC tag. The control unit 41 adds the antenna number “10010” of the internal antenna 2 to the read employee number “A00001” to generate detection information, controls the communication unit 42, and transmits the detection information to the management terminal 5.

  Thereafter, when an employee (FIG. 9) with employee number “A00002” enters the inside of the building 100 through the entrance, the control unit 41 of the reading device 4 uses the internal antenna 2 attached to the inner wall of the entrance of the building 100. The employee number “A00002” is read from the IC tag attached to the passport. The control unit 41 adds the antenna number “10010” of the internal antenna 2 to the read employee number “A00002” to generate detection information, controls the communication unit 42, and transmits the detection information to the management terminal 5. Almost at the same time, when an employee with the employee number “A00001” exits from the entrance of the building 100, the control unit 41 of the reading device 4 is pasted on the passport by the internal antenna 2 attached to the outer wall of the entrance of the building 100. The employee number “A00001” is read from the IC tag. The control unit 41 adds the antenna number “10020” of the external antenna 3 to the read employee number “A00001” to generate detection information, controls the communication unit 42, and transmits the detection information to the management terminal 5.

  When the employee with the employee number “A00003” goes to the door 101 and turns back, the control unit 41 of the reading device 4 uses the internal antenna 2 attached to the inner wall of the entrance / exit of the building 100 to attach the IC attached to the passport. The employee number “A00003” is read from the tag. The control unit 41 adds the antenna number “10010” of the internal antenna 2 to the read employee number “A00003” to generate detection information, controls the communication unit 42, and transmits the detection information to the management terminal 5. Since this employee turned back, the control unit 41 does not read the employee number “A00003” from the external antenna 3.

  The processing unit 51 of the management terminal 5 receives the four detection information by the employee of the employee number “A00001” and the employee number “A00001”, and then reads one detection information by the return of the employee of the employee number “A00003”. When receiving from the device 4, a reception process (FIG. 7) is performed, and the detection information is recorded in the virtual storage area as shown in FIG.

  Thereafter, the processing unit 51 of the management terminal 5 performs an entry / exit management process, selects registration information with a registration number of “01” from the virtual storage area (FIG. 11), and determines entry / exit. . In this case, since the antenna number “10020” of “first reception” is larger than the antenna number “10010” of “reception”, the control unit 41 determines that the employee (FIG. 9) with the employee number “A00002” is the building in the access management process. The entry / exit management information shown in FIG. 10 is updated by judging that the user has entered the inside from the entrance / exit 100, and the employee number “A00002” is registered in the entry / exit management information as shown in FIG. Further, the processing unit 51 sets “1” to “1” in the virtual storage area (FIG. 11), sets a flag, and records that the entry / exit management processing for the registration information with “01” is completed. .

  Thereafter, the entry / exit management process selects the next young number “02” with no registration flag from the registration information in the virtual storage area (FIG. 11), and determines entry / exit. In this case, since the antenna number “10010” of “first reception” is smaller than the antenna number “10020” of “reception”, the control unit 41 uses the entrance / exit management process to make the employee (FIG. 9) of the employee number “A00001” 12 is updated and the entry / exit management information in FIG. 12 is updated, and as shown in FIG. 13, the “entrance / exit” of the employee number “A00001” is set to “0”, the flag is lowered, and the employee number “A00001” is updated. Record that the employee has exited from the entrance of the building 100. Then, for example, the time recorded in the “reception time” of “post-reception” in the virtual storage area (FIG. 11) is recorded as the “departure time”. Further, the processing unit 51 sets “1” to “1” in the virtual storage area (FIG. 11), sets a flag, and records that the entry / exit management processing for the registration information with “02” is completed. .

  By the way, the processing unit 51 of the management terminal 5 refers to the clock unit 56, and when a predetermined time elapses from the “reception time” of “first reception” in the virtual storage area (FIG. 11), the virtual storage area (FIG. 11). Information recorded only for “pre-reception”, that is, information of “pre-reception” corresponding to “03” as the “registration number” is deleted.

  After the entry / exit management information (FIG. 13) is generated in this manner, when an instruction for displaying the entry / exit state is input to the input unit 53, the input unit 53 sends this instruction to the processing unit 51. When the processing unit 51 receives an instruction to display the entry / exit state, the processing unit 51 reads the entry / exit management information from the processing unit 51 and displays it on the display unit 55. Further, the processing unit 51 rearranges the entry / exit management information (FIG. 13) for each affiliation in accordance with an instruction to the input unit 53 and displays it on the display unit 55.

  Thus, according to this embodiment, it is possible to distinguish whether an employee enters the interior from the entrance of the building 100 or exits from the entrance of the building 100. Further, since the employee only needs to wear a passport with the IC tag 1 attached and go through the entrance of the building 100, speedy passage is possible. Further, even when multiple employees go in and out at the same time, since the employee number is detected using the internal antenna 2 and the external antenna 3, it is possible to determine whether the employee is going in or out.

(Embodiment 2)
In this embodiment, a gate antenna is used instead of the internal antenna 2 and the external antenna 3 of the first embodiment. In this embodiment, components that are the same as or the same as those in the first embodiment are given the same reference numerals, and descriptions thereof are omitted. As shown in FIG. 14, the internal gate antenna 2 </ b> A is installed inside the entrance of the building 100 and on both sides of the door 101. Similarly, the external gate antenna 3 </ b> A is installed outside the entrance of the building 100 and on both sides of the door 101.

  The two internal gate antennas 2A correspond to the internal antenna 2 (FIG. 2) of the first embodiment, and each have a loop antenna inside. The two internal gate antennas 2 </ b> A perform transmission and reception of electromagnetic fields with the IC tag 1 located inside the entrance of the building 100. Similarly, the two external gate antennas 3A correspond to the external antenna 3 (FIG. 2) of the first embodiment, and each has a loop-shaped antenna inside. The two external gate antennas 3A transmit and receive electromagnetic fields to and from the IC tag 1 outside the entrance of the building 100.

  Even if such an internal gate antenna 2A and an external gate antenna 3A are used, the entrance and exit of employees can be managed as in the first embodiment.

  As described above, the first and second embodiments of the present invention have been described in detail. However, the specific configuration is not limited to these embodiments, and there are design changes and the like without departing from the scope of the present invention. However, it is included in this invention. For example, in each embodiment, the management object is an employee, but the present invention can also be used for physical distribution targeting luggage or the like. In each embodiment, the IC tag 1 having no battery is used. However, an IC tag having a battery can also be used. Furthermore, in each embodiment, the internal antenna 2 and the external antenna 3 are installed at the entrance of the building 100. However, the internal antenna 2 and the external antenna 3 are installed at the entrance of the room in the building 100 so The state may be determined.

It is a block diagram which shows the access management system by embodiment of this invention. It is a figure which shows the mode of installation of an antenna, Fig.2 (a) is a front view of the entrance / exit of a building, FIG.2 (a) is sectional drawing of the entrance / exit of a building. It is a figure which shows an example of antenna identification information. It is a figure which shows an example of a temporary storage area. It is a figure which shows an example of employee information. It is a figure which shows an example of entrance / exit management information. It is a flowchart which shows an example of a reception process. It is a flowchart which shows an example of an exit / entry management process. It is a figure which shows the entrance and exit of an employee. It is a figure which shows the specific example of entrance / exit management information. It is a figure which shows the specific example of a temporary storage area. It is a figure which shows the specific example of entrance / exit management information. It is a figure which shows the specific example of entrance / exit management information. It is a figure which shows the mode of installation of the gate antenna by Embodiment 2, Fig.2 (a) is a front view of the entrance / exit of a building, FIG.2 (a) is sectional drawing of the entrance / exit of a building.

Explanation of symbols

1 IC tag (information medium)
2 Internal antenna (second antenna)
3 External antenna (first antenna)
4 Reading device (processing means)
5 Management terminal (processing means)
6 Communication line

Claims (4)

An information medium that is possessed by a management object passing through the doorway and stores the identification information for identifying the management object in a readable manner;
A first antenna that is provided outside the entrance and reads identification information from the information medium when the information medium is outside the entrance;
A second antenna that is provided inside the doorway and reads identification information from the information medium when the information medium is inside the doorway;
Processing means for determining whether the information medium enters or exits from the doorway according to a difference in reading time of identification information read by the first antenna and the second antenna;
An access control system characterized by comprising:   When the second antenna reads the identification information after the first antenna reads the identification information, the processing means moves the information medium storing the identification information from the outside to the inside of the doorway. Determining that the information medium has passed from the inside to the outside of the doorway when the first antenna reads the identification information after the second antenna has read the identification information. The entrance / exit management system according to claim 1, wherein   The information medium is an IC tag, and the processing means reads identification information from the IC tag by transmitting an electromagnetic field from the first antenna and the second antenna. The entry / exit management system described in 1. An entry / exit management method using an information medium that is possessed by a management object that passes through an entrance, and that stores readable identification information for identifying the management object,
Reading identification information from the information medium when the information medium is outside the doorway from the first antenna provided outside the doorway,
Reading identification information from the information medium when the information medium is present inside the doorway from the second antenna provided inside the doorway,
The entry / exit of the information medium with respect to the entrance / exit is determined by the difference in the reading time of the identification information read by the first antenna and the second antenna,
The access control method characterized by this.

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