JPH10124633A - Non-contact medium processor, entrance/exit managing device and non-contact medium processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To evade a communication error by changing the communication period of transmitting/receiving data to/from a non-contact medium (card) when receiving data received from the card is judged as unsuitable data. SOLUTION: An entrance/exit managing device is constituted of a non-contact card reader 12 for executing data communication by transmission/reception with a card 11 provided with ID information and allowed to be used in a non- contact state and an external equipment 13 connected to the card reader 12. Personal data carrier(DC) 11a such as the name and code number of its user is stored in the card 11 and the DC 11a is read out and checked by the card reader 12. At the time of judging that received data structure is destructed due to mutual interference, a CPU 14 built in the card reader 12 generates a communication error for abnormal data. In this case, the CPU 14 changes the period to be transmitted next based on random values so as to automatically change the period differently from the communication period of another non- contact card reader and resends the changed period.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact medium processing apparatus used, for example, for controlling the entrance and exit of a room, and more particularly, to a reliable communication without being adversely affected by ambient jamming radio waves. The present invention relates to a non-contact medium processing device, an entry / exit management device, and a non-contact medium processing method.

[0002]

2. Description of the Related Art An entry / exit management device for managing entry / exit of a room will be described below as an example.
As shown in FIG. 8, for example, a non-contact card reader 83 having a non-contact ID antenna is provided at the entrance of each of the rooms 82a, 82b, 82c, 82d. When a non-contact card key 84 provided with a carrier supports communication, the ID information of the card key is read in a non-contact manner to open and close a door of a room.

At this time, when a plurality of non-contact card readers 83 are installed in a certain area, during data communication between a certain non-contact card reader 83 and a corresponding non-contact card key 84, another non-contact card The scan transmission outputs 85 of the card readers 83 interfere with each other to become jamming radio waves, and proper data communication cannot be performed (hereinafter, this phenomenon is referred to as mutual interference).

In order to avoid this mutual interference, a synchronization signal line is provided between the antennas of the card readers to synchronize transmission output timings from the antennas. It is conceivable to prevent the occurrence of the phenomenon. However, in this case, since it is necessary to synchronize the electric signals, there is a problem that communication can be performed only in the communication area 86 within a short distance (about 30 cm).

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention provides an accurate data communication without causing mutual interference even if a plurality of non-contact medium processing devices such as a non-contact card reader are installed in an area where they interfere with each other. Non-contact media processing device, which can
It is an object to provide an entry / exit management device and a non-contact medium processing method.

[0006]

According to the first aspect of the present invention,
A non-contact medium processing device that performs data processing by transmitting and receiving data to and from a non-contact medium, and a determination unit that determines whether the reception data received from the non-contact medium is appropriate.When the determination unit determines that the reception data is inappropriate, A change unit for changing a communication cycle of transmission / reception data with respect to the non-contact medium is provided.

[0007] The invention according to claim 2 is characterized in that it comprises a judging means for judging whether or not the data structure of the received data received from the non-contact medium has been destroyed.

According to a third aspect of the present invention, there is provided an entry / exit management device configured to manage entry / exit of a room using a non-contact medium processing device.

According to a fourth aspect of the present invention, there is provided a non-contact medium processing method for judging whether received data received from a non-contact medium is appropriate, and when the judgment result is inappropriate, changing a communication cycle of transmission / reception data to the non-contact medium. It is characterized by being.

[0010]

According to the present invention, when performing data processing by transmitting / receiving data to / from a non-contact medium, the judging means judges propriety of received data received from the non-contact medium, and when the judgment result is inappropriate,
The communication unit changes the communication cycle of the transmission / reception data with respect to the non-contact medium.

[0011] Further, when determining whether or not the received data received from the non-contact medium is appropriate, it is determined whether or not the data structure is destroyed.

[0012] In addition, entry and exit from the room are managed by using the non-contact medium processing device.

Further, when it is determined whether the received data received from the non-contact medium is appropriate or not, if the determination result is inappropriate, the communication cycle of the transmission / reception data to the non-contact medium is changed.

[0014]

As a result, if the communication cycle to the non-contact medium is changed, the communication cycle can be distinguished from other communication radio waves and the communication with the non-contact medium to be accurately communicated can be performed. Can be. Therefore, even if a communication error occurs due to mutual interference during data communication with the non-contact medium, it is possible to immediately change the communication cycle and perform appropriate re-communication.

Therefore, even when a plurality of non-contact medium processing devices are used in a condition where mutual interference is likely to occur, such as arranging in a mutual interference area and communicating, accurate communication with the non-contact medium can be achieved.
Communication errors can be completely avoided. In addition, since mutual interference can be avoided without synchronizing the transmission output timing between the antennas of the plurality of non-contact medium processing devices, a long distance antenna having a large mutual interference distance can be used without any trouble.

Furthermore, if this non-contact medium processing device is applied to an entry / exit management device configured to manage entry / exit of a room, it is possible to manage the permitted entry / exit control of the room and to control the current number of people in the room and the number of people in the room. The situation and the number of occupants can be accurately managed, and entry / exit management can be performed under highly reliable management.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a control circuit block diagram of an entry / exit management device for managing entry / exit of a room.
It comprises a non-contact card reader 12 for transmitting and receiving data to and from a non-contact ID card (hereinafter referred to as a card) 11 having information and used in a non-contact manner, and an external device 13 connected to the non-contact card reader 12. You.

The above-mentioned card 11 is a personal data carrier (DC) 11 such as a name and a code number for identifying a user.
The DC 11a is read and checked by the contactless card reader 12.

The CP provided in the contactless card reader 12
U14 controls each circuit device according to the program stored in ROM15, and stores the control data in RAM16 in a readable manner.

A transmitting circuit 17 transmits and outputs transmission data to a communication area via a transmitting antenna 18 based on a control signal of the CPU 14, and a receiving circuit 19 receives data received from the card 11 via a receiving antenna 20. input.

Further, the external device 13 includes a display, a buzzer,
Input / output devices such as switches, host computers, etc. that are suitable for entering / leaving management, such as providing guidance and guidance according to entering / leaving operations, notifying the entering / leaving operation by issuing a confirmation sound, and counting the number of people. It is provided to do.

When data is exchanged with the card 11, the CPU 14 determines whether or not the received data structure is destroyed due to the adverse effect of the mutual interference due to the interfering radio waves with the communication area of another contactless card reader. It has a judgment function. At this time, if the received data received from the card 11 is normal, data processing with the card 11 is permitted because proper data communication is performed.

However, when it is determined that the received data structure is destroyed by mutual interference, a communication error occurs due to abnormal data. At this time, the CPU 14 has a communication cycle changing function of changing the cycle to be transmitted next based on the random number value, automatically changing the cycle to be different from the communication cycle of the other contactless card readers, and retransmitting. doing.

For example, when changing the setting of the communication cycle, (1) a random number is generated when the power is turned on, and the synchronization is intentionally shifted for each contactless card reader by using the random number. For example, t = 100 + (0 to 50) ms t: time (2) When a communication error occurs, it is determined whether or not retransmission is to be performed based on the content of the error. Do not send). (3) When a communication error occurs, retransmit the cycle to change the setting. For example, t = 100 + (0 to 50) ms t: time If the communication cycle is changed in this way, the communication cycle can be distinguished from other communication radio waves and communication with a card to be communicated accurately can be performed. Even if a communication error occurs due to mutual interference during data communication between the non-contact card reader and the card, appropriate re-communication can be immediately performed by changing the communication cycle.

FIG. 2 shows the basic operation timing of the transmission cycle when transmitting the transmission data. The scan transmission output 21 is separated from the transmission output time T2 by a fixed pause time T1.
, And this is repeatedly output at a constant cycle.

FIG. 3 shows a maximum communication data distance 31 transmitted and received from one contactless card reader 12 and a communication data area 32 thereof.

FIG. 4 shows a case where the data carrier 11a of one card corresponding to communication in a specific communication data area and the transmitting antenna 18 of one contactless card reader transmit data in the basic communication cycle (pause time T1). This section shows the operation state during normal data transmission. At this time, no mutual interference occurs and proper data processing is performed.

FIG. 5 shows a case where the normal transmission antenna 18a of the two contactless card readers and the other transmission antenna 18b overlap and transmit to the data carrier 11a of one card corresponding to the communication in the specific communication data area. 5 shows an operation state when abnormal data is transmitted. At this time, since a transmission error occurs due to mutual interference and the transmission errors are synchronized, a transmission error repeatedly occurs on the side of the regular transmission antenna 18a, and proper data processing cannot be performed.

FIG. 6 is a diagram showing the mutual transmission when the regular transmitting antenna 18a and the other transmitting antenna 18b of the two contactless card readers transmit data to the data carrier 11a of one card corresponding to the communication in the specific communication data area. The operation state when preventing interference is shown. This is because, when the first transmission error occurs due to mutual interference on the legitimate transmission antenna 18a, the transmission cycle is immediately changed from the random number value, the transmission cycle is made different from that of the other transmission antennas 18b, and the cycle is retransmitted. . Thereby, mutual interference is avoided, and appropriate data processing is performed thereafter.

The operation of setting the communication cycle of the entry / exit management apparatus thus configured will be described with reference to the flowchart of FIG. Now, when the power of the plurality of contactless card readers 12 is turned on, individual transmission periods (sampling periods) that are different for each contactless card reader 12 using a random number value so that the scan transmission periods are not synchronized. Is set (step n1).

At the set sampling period, the transmitting antennas 18 of the respective contactless card readers 12 transmit and output toward the respective communication areas (step n2).

At this time, when the CPU 14 determines that a plurality of transmission outputs overlap and a communication error due to mutual interference has occurred (steps n3 to n4), the CPU 14 immediately changes the transmission cycle from the random number value, and Enables data processing to avoid mutual interference. As a result, the transmission cycle is slightly different for each of the non-contact card readers 12..., And communication with the corresponding card 11 can be reliably performed in the predetermined communication area (step n5).

As described above, if the transmission cycle to the card is changed, the difference in the transmission cycle makes it possible to distinguish the transmitted radio wave from other transmission radio waves, thereby enabling accurate communication with the card to be communicated. Therefore, even if a communication error occurs due to mutual interference during data communication with the card, it is possible to immediately change the transmission cycle and perform appropriate recommunication. Therefore, even when a plurality of contactless card readers are used in a condition where mutual interference is likely to occur, such as arranging in a mutual interference area, communication can be performed accurately with the corresponding card, and communication errors are completely avoided. Can be. In addition, even when a plurality of contactless card readers are provided, mutual interference can be avoided without requiring an electrical synchronization signal between antennas, so that short-range communication is not restricted, and the mutual interference distance is increased. Distance antennas can also be used without hindrance. Furthermore, by applying this non-contact card reader to an entry / exit management device, in addition to being able to manage the admission control of entry / exit, it is possible to accurately manage the current number of people in the room, the usage status, the number of people in the room, etc. Entry and exit management can be performed under highly reliable management.

In the correspondence between the present invention and the configuration of the above-described embodiment, the non-contact medium processing device of the present invention corresponds to the non-contact card reader 12 of the embodiment. Although it corresponds to the non-contact ID card 11 and the determination means and the change means correspond to the CPU 14, the present invention is not limited to the configuration of the above-described embodiment.

[Brief description of the drawings]

FIG. 1 is a control circuit block diagram of an entry / exit management device of the present invention.

FIG. 2 is an output waveform diagram showing a basic operation timing of a transmission cycle according to the present invention.

FIG. 3 is a plan view showing a communication data area of the contactless card reader of the present invention.

FIG. 4 is an explanatory diagram showing a normal communication state during data communication according to the present invention.

FIG. 5 is an explanatory diagram showing an abnormal communication state due to mutual interference during data communication according to the present invention.

FIG. 6 is an explanatory diagram showing a communication state when preventing mutual interference during data communication according to the present invention.

FIG. 7 is a flowchart showing a communication cycle setting processing operation of the present invention.

FIG. 8 is an explanatory diagram showing a communication state of a non-contact card reader of a conventional entry / exit management device.

[Explanation of symbols]

 11 contactless ID card 11a data carrier 12 contactless card reader 14 CPU

Claims (4)

[Claims] 1. A non-contact medium processing device for performing data processing by transmitting and receiving data to and from a non-contact medium, comprising: determining means for determining whether received data received from the non-contact medium is appropriate; A non-contact medium processing device including a change unit that changes a communication cycle of transmission / reception data with respect to the non-contact medium. 2. The non-contact medium processing device according to claim 1, wherein the determining means determines whether a data structure of the received data received from the non-contact medium is destroyed. 3. An entry / exit management device configured to manage entry / exit of a room using the non-contact medium processing device according to claim 1. 4. A non-contact medium processing method for judging whether received data received from a non-contact medium is appropriate, and when the judgment result is inappropriate, changing a communication cycle of transmission / reception data with respect to the non-contact medium.