JPH0668329A - Traveling object identifying device - Google Patents

Abstract

PURPOSE:To provide a traveling object identifying device which communicates with many responders entering the communication area of an interrogator, without the generation of a crosstalk. CONSTITUTION:In the traveling object identifying device constituted of responders 2a and 2b owned by traveling objects 3a and 3b, to which a peculiar identification number is assigned, and an interrogator 1 which communicates with the responders by using a non-contact communicating means such as a radio wave, sensor means 4a and 4b which preliminarily detect the number of the traveling objects passing through the communication area of the interrogator 1 are provided so that the communication area of the interrogator 1 can be changed according to the detected number of the traveling objects. Thus, when many traveling objects pass through the communication area of the interrogator 1, the communication area is made narrower than the communication area when a few traveling objects pass through, so that the possibility of the crosstalk can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving body identifying apparatus using non-contact communication means such as radio waves. For example, a periodic automatic reading apparatus for non-contact reading a commuter pass at a ticket gate of a railway station. It is also used in a room entry / exit management system for reading employee IDs in a non-contact manner in the company, other FA fields, logistics fields, etc.

[0002]

2. Description of the Related Art Conventionally, with respect to a transponder held in a mobile body and assigned a unique identification number, the identification number of the transponder is read from the interrogator by using non-contact communication means such as radio waves, and a response is made. There is known a mobile body identification device that writes data to a container. FIG. 3 is a schematic configuration diagram of a conventional moving body identifying apparatus, in which 1 is an interrogator and 2 is a responder. Further, Q is an inquiry signal and A is a response signal. In the interrogator 1, 10 is a control circuit, 11 is a modulator, 12 is a demodulator, 13 is a transmitting antenna, 14 is a receiving antenna, and 15
Is a receiving amplifier. In the responder 2, 20 is a control circuit, 21 is a modulator, 22 is a demodulator, 23 is a transmitting antenna, 24 is a receiving antenna, and 25 is a receiving amplifier. The interrogator 1 transmits an unmodulated interrogation signal Q from the transmission antenna 13 under the control of the control circuit 10. When the responder 2 receives the inquiry signal Q by the receiving antenna 24,
The signal is amplified by the reception amplifier 25, demodulated by the demodulator 22 and input to the control circuit 20. The control circuit 20 reads the identification number stored in the internal memory, controls the modulator 21 by the data of the identification number, and transmits the response signal A including the identification number from the transmitting antenna 23. When the interrogator 1 receives the response signal A by the reception antenna 14, the interrogator 1 amplifies it by the reception amplifier 15, demodulates it by the demodulator 12, and causes the control circuit 10 to read the identification number of the transponder. Moreover, when writing data from the interrogator 1 to the responder 2, the interrogation signal Q is modulated by the modulator 11 according to the data to be written. Such a moving body identification device is currently used in a commuter ticket automatic reading device at a railway station ticket gate that uses a transponder as a commuter pass, and an employee entrance / exit management system that uses the transponder as an employee ID card. Proposed.

[0003]

However, in the system to which the conventional mobile body identification device is applied, the communication area of the interrogator is constant even if the number of responders entering the communication area of the interrogator changes. Therefore, there is a problem that interference is likely to occur in the communication between the interrogator and the plurality of responders.

Hereinafter, a situation where interference occurs in communication between the interrogator and the responder will be described. FIG. 4 shows a state in which a large number of persons who hold the transponders are in the communication area of the interrogator. In the figure, 3a, 3b, 3c, ... Represents a person who has a responder, 2a, 2b, 2c ,. It is an interrogator that reads and writes information in the responder. Further, Z indicates the communication area of the interrogator.
4, a large number of persons 3a, 3b, 3c, ... Having the responders 2a, 2b, 2c, ... Trying to pass through the communication area Z of the interrogator 1 while communicating with the interrogator 1. . Since the size of the communication area Z of the interrogator 1 is constant, a large number of responders 2a, 2 are provided in the communication area Z of the interrogator 1.
, b, 2c, ... Are present at the same time, which increases the possibility of causing interference in communicating between the interrogator 1 and the responders 2a, 2b, 2c ,. There is.

The present invention has been made in view of the above points, and an object of the present invention is to communicate with a large number of transponders coming into a communication area of an interrogator without causing interference. It is to provide a moving object identification device capable of performing the following.

[0006]

In order to solve the above-mentioned problems, in the moving body identifying apparatus of the present invention, as shown in FIG. 1, a unique identification number is held in each moving body 3a, 3b. In a mobile body identification device comprising transponders 2a and 2b assigned to the interrogator, and an interrogator 1 that communicates with the transponder using non-contact communication means such as radio waves, the interrogator 1 passes through the communication area. Means 4a for detecting in advance the number of moving objects
4b, and means for changing the communication area of the interrogator 1 according to the number of detected moving bodies.

Further, as shown in FIG. 2, depending on the place where the interrogator 1 is installed, the interrogator 1 may be provided with a reflector 6 for reflecting radio waves.
It is preferable to change the directivity of the interrogator 1 by facing each other at a predetermined angle.

[0008]

According to the present invention, the number of moving bodies passing through the communication area of the interrogator 1 is detected in advance, and the communication area of the interrogator 1 is changed according to the detected number of moving bodies. Therefore, when a large number of moving objects pass as shown in FIG. 1 (B), interference is reduced by narrowing the communication area compared to when a small number of moving objects pass as shown in FIG. 1 (A). It is possible to reduce the possibility of

Further, as shown in FIG. 2, if the directivity of the interrogator 1 is changed by facing the interrogator 1 with a reflector plate 6 for reflecting radio waves at a predetermined angle, the responders 2a, 2a and 2b will be displayed.
It is possible to communicate even if b, ... And the interrogator 1 are not facing each other.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment in which the moving object identifying apparatus of the present invention is applied to an employee entry / exit management system. 3 in the figure
a, 3b, 3c, ..., 3i are employees who have a responder as an employee ID, 2a, 2b, 2c ,. Is. Further, 1 is an interrogator for reading information from an employee ID card (responder) held by a person by non-contact communication means, 4
Reference numerals a and 4b are sensor means such as a photoelectric sensor for detecting a person. The interrogator 1 can control the communication area to be widened or narrowed by increasing or decreasing the output.

The operation of this embodiment will be described below.
FIG. 1 (A) shows a case where a small number of employees 3a, 3b pass, and the two sensor means 4a, 4b do not detect a person at the same time, and the sensor means 4a, 4b pass a small number of people. Information about the number of people is sent to the interrogator 1. Based on this information, the interrogator 1 has a wide communication area Za and the responder 2
The inquiry signal is sent to a and 2b, the response signal from the responder 2a and 2b is received, the information obtained by the communication is sent to the host computer, and the entry and exit of the employee is managed.

On the other hand, FIG. 1B shows that a large number of employees 3c,
3d, 3e, ..., 3i pass, and the sensor means 4a, 4b at two locations simultaneously detect a person, and the sensor means 4a, 4b inform the interrogator that there is a large number of people. Send to 1. Based on this information, the interrogator 1 sends an interrogation signal to the responder 2c in a narrow communication area Zb, and communicates only with a limited number of responders, thereby avoiding interference, and as an employee ID held by the employee. It communicates with the transponder.

FIG. 2 shows an embodiment in which the moving body identifying apparatus of the present invention is applied to a periodic automatic reading apparatus at a railway station ticket gate. In the figure, 3a and 3b are passengers who hold a transponder as a commuter pass, 2a and 2b are transponders in which information necessary for the commuter pass such as a boarding section is written, and 1 is a commuter pass held by a person. An interrogator for reading information from a responding device by a non-contact communication means, 4a and 4b are sensor means such as photoelectric sensors for detecting passengers, 5 is an automatic ticket gate incorporating an interrogator, and 6 is an interrogator. It is a reflector for changing the directivity of. By providing the reflecting plate 6, the communication area of the interrogator is deflected as shown by Za and Zb in FIGS. 2 (A) and 2 (B), and the responder as a commuter pass faces the front of the interrogator. You can communicate without it.

The operation of this embodiment will be described below.
FIG. 2A shows a case where the number of passengers is small, and the sensor means 4a and 4b at two locations do not detect a person at the same time, and the sensor means 4a and 4b have a small number of passengers passing by. Is sent to the interrogator 1. Based on this information, the interrogator 1 sends an interrogation signal to the responder 2a in the wide communication area Za, and the responder 2 in which the information of the commuter pass is written.
It receives the response signal from a and sends the information obtained by the communication to the host computer to control the automatic ticket gate system.

On the other hand, FIG. 2B shows a case where a large number of passengers pass by, and the sensor means 4a, 4b are detected by the sensor means 4a, 4b at two locations simultaneously detecting the passengers.
b is an interrogator 1 for the information that there are many passengers passing through.
Send to. Based on this information, the interrogator 1 has a narrow communication area Z.
In b, an inquiry signal is sent to the transponder 2c and only a limited number of transponders are communicated with, thereby avoiding interference and communicating with the transponder as a commuter pass held by the passenger. In this way, depending on the number of passengers passing by,
The communication area of the interrogator 1 is changed to prevent interference due to communication with a plurality of responders.

In each of the above embodiments, the power of the moving body identifying apparatus is turned on only when the moving body passes by using the outputs of the sensor means 4a and 4b for detecting the moving body.
If the interrogator 1 is configured to transmit the interrogation signal, it is possible to turn off the power supply of the mobile body identification device when there is no moving body passing therethrough, and the radio wave from the interrogator 1 is transmitted more than necessary. Can be prevented from being radiated.

[0017]

According to the first aspect of the present invention, by changing the communication area of the interrogator according to the number of moving bodies, it is possible to prevent a large number of responders from entering the communication area of the interrogator, and to prevent interference. This has the effect of reducing the possibility that

According to the second aspect of the present invention, by using the reflector which can change the directivity of the interrogator, it is possible to communicate even if the transponder does not face the interrogator. effective.

[Brief description of drawings]

FIG. 1 is an operation explanatory diagram of a first embodiment of the present invention.

FIG. 2 is an operation explanatory diagram of the second embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a conventional mobile body identification device.

FIG. 4 is an operation explanatory diagram of a conventional example.

[Explanation of symbols]

 1 Interrogator 2a, 2b, 2c, ... Responder 3a, 3b, 3c, ... Mobile unit (employee or passenger) 4a, 4b Sensor means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhiro Matsumoto 1048, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works, Ltd.

Claims (2)

[Claims] 1. A mobile unit identification comprising a transponder held in the mobile unit and assigned a unique identification number, and an interrogator for communicating with the transponder by using non-contact communication means such as radio waves. In the device, a moving body comprising means for detecting in advance the number of moving bodies passing through the communication area of the interrogator, and means for changing the communication area of the interrogator according to the number of detected moving bodies. Identification device. 2. The moving body identifying apparatus according to claim 1, wherein a directivity of the interrogator is changed by facing a reflector for reflecting radio waves with the interrogator at a predetermined angle.