JPH0696316A - Radio transmitter-receiver - Google Patents

Abstract

PURPOSE:To provide a radio transmitter-receiver which eliminates restrictions on the installation place of a radio card and performs stable transmission and reception with an extremely small low read and a write error. CONSTITUTION:The radio transmitter-receiver sends a radio signal between a read/write antenna 23 and a radio card 11 through the double antenna consisting of a 1st loop coil 20 provided in an automobile 10 and a 2nd loop coil 21 provided outside the automobile 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to, for example, toll roads,
The present invention relates to a wireless transmission / reception device used in a toll collection system using a wireless information medium that reads information from a wireless information medium (hereinafter referred to as a wireless card) placed in an automobile and automatically collects a toll.

[0002]

Description of the Related Art At present, on toll roads in Japan, users pay the toll by cash, coupon tickets, prepaid cards, or the like. However, in recent years, a fee collection system using a wireless card, which allows payment of fees without the help of a fee collector, is being developed and is attracting attention. According to this system, at the toll booth, not only the congestion caused by handing the toll between the user and the toll collector, but also the burden on the toll collector can be significantly reduced. FIG. 3 is a diagram showing an outline of a fee collection system using the wireless card.

As shown in the figure, a wireless card 11 is placed on a moving vehicle 10. As the wireless card 11, for example, the one described in Japanese Examined Patent Publication No. 1-42030 is used, the balance information and the travel history information are stored in advance, and the stored contents can be freely read / written (rewritten) by a command signal. You can do it.

In FIG. 3, when the automobile 10 approaches the toll gate island 12, the reading antenna 13 reads the balance information and the traffic history information (for example, from which interchange) the wireless card 11 is stored. . The read information is the reader / writer device 1
5, the charge is calculated by the charge processor 16, and finally the balance information is written from the writing antenna 14 to the wireless card 11.

[0005]

According to this system, there is an advantage that traffic congestion is alleviated and the burden on the toll collector is alleviated, but it is necessary to reliably transmit and receive radio waves between the antenna and the wireless card. I won't. That is, it is required to reduce the read error and the write error to zero. However, since the automobile is covered with an iron plate except the window glass and is electromagnetically shielded, it is difficult for radio waves to pass between the interior of the automobile and the outside. further,
Since the radio waves used are weak, in order to reduce reading and writing errors, the wireless card had to be placed in close contact with the window glass such as the windshield or installed near the window glass. If the wireless card is in close contact with the windshield, the field of view will be narrowed, and direct sunlight may deform the card in the summer, causing card failure. In addition, there is a risk that the wireless card can be seen from the outside and the card may be stolen during parking.

The present invention has been made in consideration of the above problems, and provides a wireless transmission / reception device capable of stable transmission / reception with no restriction on the installation location of a wireless card and with extremely few read / write errors. The purpose is to do.

[0007]

In order to solve the above-mentioned problems, a wireless transmission / reception device of the present invention is provided in a vehicle compartment, at least balance information and traffic use history information are stored, and a read command signal and a write command signal are used. A wireless information medium capable of reading and writing these pieces of information, and a wireless signal transmitted from the wireless information medium by the read command signal or the write command signal to the wireless information medium and the command signals. Is provided outside the vehicle and is connected to the first loop coil, and the wireless signal received by the first loop coil is supplied to the outside of the vehicle. A second loop coil that sends out a signal outside the vehicle and supplies the signal to the first loop coil;
Sending the read command signal and the write command signal,
It is characterized by comprising a read / write antenna for receiving the radio signal transmitted from the second loop coil.

[0008]

According to the above structure, the exchange of the radio signal between the read / write antenna and the radio card is
It is performed via a double antenna composed of a first loop coil and a second loop coil provided outside the vehicle. As a result, the wireless card is not necessarily placed near the window glass such as the windshield in the vehicle interior, and there is no restriction on the installation location, and the distance between the read / write antenna and the second loop coil is narrowed. Therefore, read / write errors are reduced.

[0009]

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a configuration of a wireless transmission / reception device of the present invention,
The same reference numerals are used for the same parts as in FIG.

As shown in the figure, the wireless card 11 is installed inside the vehicle 10. The figure shows a state where the driver's seat 24 is placed beside it. The first loop coil 20 is installed on a dashboard inside the vehicle 10. Also. The second loop coil 21 is installed on the bottom of the automobile 10 and is connected to the first loop coil 20 through a connection cable 22.

On the other hand, the read / write antenna 23 is used to read / write data stored in the wireless card 11 by a common antenna and is embedded in the road 25. The function of each part in the above configuration will be described with reference to FIG.

First, a read command signal is issued from the read / write antenna 23, and the second loop coil 2
This command signal is received at 1 and the connection cable 2
2 is sent to the first loop coil 20 provided inside the automobile. The first loop coil 20 sends this read command to the wireless card 11. In the wireless card 11, an antenna (not shown) provided inside receives the read command, and the data (for example, balance information) stored in the storage unit (not shown) in the wireless card 11 is read. , This data is sent out from the antenna. This data is received by the first loop coil 20 and transmitted via the connecting cable 22 to the second loop coil 21.
And is received by the read / write antenna 23.

In the case of changing (rewriting) the contents stored in the wireless card 11, a write command signal is issued from the read / write antenna 23, and this command signal is sent to the second loop coil 21 and the first loop coil 21 as in the above-mentioned read. It is sent to the wireless card 11 through the loop coil 20 and the stored contents are rewritten.

In the example of FIG. 1, the second loop coil 21 is installed at the bottom of the vehicle and the read / write antenna 23 is embedded in the road 25. Therefore, the second
Loop coil 21 and read / write antenna 23
The distance between and becomes very narrow. As a result, the transmission and reception of signals performed between the two become very good, and the reading error and the writing error become very small.

The first loop coil 20 is connected to the automobile 1
Since the wireless card 11 is installed inside the wireless communication terminal 0, even if the radio wave used is weak, the wireless card 11 does not necessarily need to be installed close to or near the window glass. In the above embodiment, the case where the first loop coil is installed on the dashboard inside the automobile has been described, but the installation place is not limited to the dashboard and may be any place in the automobile.

The second loop coil may be installed not only at the bottom of the automobile but also at the front of the automobile, for example, beside the license plate, as long as it can reliably transmit / receive data to / from the read / write antenna. .

[0017]

As described in detail above, according to the present invention,
Since the wireless signal is exchanged between the read / write antenna and the wireless card via the double antenna composed of the first loop coil and the second loop coil provided outside the vehicle, the wireless card is installed in the vehicle interior. In this case, there is no restriction on the installation location, and the distance between the read / write antenna and the second loop coil is narrowed, so that read / write errors are reduced and stable transmission / reception is possible.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an embodiment according to a wireless transmission / reception device of the present invention.

FIG. 2 is a block diagram for explaining the function of each unit in FIG.

FIG. 3 is a schematic diagram of a fee collection system in which the present invention is used.

[Explanation of symbols]

10 ... Automotive, 11 ... Wireless card, 12 ... Tollgate island, 13 ... Read antenna, 14 ... Write antenna, 15 ... Reader / writer device, 16 ... Charge processor, 2
0 ... First loop coil, 21 ... Second loop coil 22 ... Connection cable, 23 ... Read / write antenna

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location H01Q 7/00 4239-5J H04B 7/26 E 9297-5K

Claims (2)

[Claims] 1. A vehicle interior is provided with at least balance information and traffic usage history information stored therein, and a read command signal and a write command signal for reading these information.
A first writable wireless information medium and a first wireless signal medium for transmitting the read command signal or the write command signal to the wireless information medium and receiving the wireless signal transmitted from the wireless information medium in response to each command signal. A loop coil is provided outside the vehicle, is connected to the first loop coil, is supplied with a radio signal received by the first loop coil, sends the signal to the outside of the vehicle, and is external to the vehicle. A second loop coil for receiving the signal of No. 2 and supplying it to the first loop coil, the read command signal and the write command signal, and receiving the wireless signal transmitted from the second loop coil. A wireless transmission / reception device comprising a read / write antenna. 2. The radio transmitter / receiver according to claim 1, wherein the read / write antenna is embedded in a road.