JP3020225B2 - Information transmission equipment in Todo - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for transmitting information to, from, or within a road, which is provided underground.

[0002]

2. Description of the Related Art Conventionally, communication between the outside and inside of a road or communication inside a road is performed by arranging a dedicated line and communicating with the dedicated line. Also, wireless communication is not performed because high-voltage cables pass through the road and noise is generated due to the influence of these electromagnetic waves.
Recently, radio waves have been transmitted in existing underground structures using existing wiring. However, providing a dedicated line is troublesome and costly, and the dedicated line can only communicate at a predetermined location on the road and cannot communicate at an arbitrary location, which is inconvenient. Further, the radio wave method is a method in which only one transmission is performed and two-way communication is not possible. However, there is a strong demand that communication and communication inside and outside the road be freely available in case of a disaster or the like.

Therefore, as shown in FIG. 3, a fixed station 2 is provided on the ground or in the road near the opening of the fixed road 1, and an information signal of the fixed station 2 is converted into an FM wave signal to be fixed from the fixed station 2. An information signal is transmitted to and received from the fixed station 1 by a mobile station 4 comprising a receiver connected to an existing power line 3 in the road 1 and using the existing light line 3 as an antenna line at an appropriate place in the road 1. An information transmission system was developed.

[0004]

However, the power line 3 in the above-mentioned road 1 is grounded at the distribution board point 3a, but the terminal portion 3b is not grounded, so that a ground return system is formed. Not. Therefore, when receiving, noise is present and it is hard to hear. As shown in FIG. 4, when there is another power line 3 ′ adjacent to the power line 3 in the road 1, this another power line 3 ′ is used as an antenna line and the power line 3 and five switches. In this case, a ground return system is formed by grounding the distribution board 3'a of the power line 3 'of the separate system,
The signal connection between the power line 3 and the power line 3 'is poor, and noise or the like enters and reception is difficult.

[0005] The present invention is to solve the above problems by providing a good transmission and reception apparatus in such an information transmission system in a road.

[0006]

According to the first aspect of the present invention, a fixed station is provided on the ground or in the road near the opening of the fixed road, and the information signal of the fixed station is converted into an FM wave signal. In an information transmission circuit, which is connected to an existing power line in a carousel and transmits / receives an information signal to / from the fixed station by a mobile station including a receiver at an appropriate location in the road as an antenna line using the existing power line, A lead wire is provided separately from the power line, one end of which is grounded, a connector for transmitting and receiving signals is provided on each of the lead wire and the light line, and an LC circuit connected in series between these connectors is provided, and Both ends of this LC circuit are grounded, and the information transmission device in the road has a configuration in which resonance occurs.

According to a second aspect of the present invention, a fixed station is provided on the ground or in the road near the opening of the road, and the information signal of the fixed station is converted into an FM wave signal to be installed in the road from the fixed station. In an information transmission circuit for transmitting and receiving information signals to and from the fixed station by a mobile station comprising a receiver at an appropriate place in the road where the existing light line is used as an antenna line, the existing light line is used as an antenna line. With different light lines, each of these light lines is provided with a connector for transmitting and receiving a signal respectively, and an LC circuit connected in series between these connectors is provided.
In addition, the information transmission device in the road has a configuration in which both ends of the LC circuit are grounded and resonance occurs.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention, in which a conductor 6 is provided separately from the electric wire 3 and one end 6a is grounded, and the other end 6b of the electric wire 6 and the tip 3b of the electric wire 3 are shown. And an LC circuit 10 in which a coil 8 and a capacitor 9 are connected in series between these connectors 7, and both ends 10a of the LC circuit 10 are grounded. In addition, the configuration is such that resonance occurs at both ends of these LC circuits 10.

As a result, a ground return system is formed by the grounding of the distribution board point 3a of the power line 3 and the grounding of one end 6a of the conducting wire 6. In addition, since the power line 3 and the conducting wire 6 are resonated by the LC circuit 10, the function of the power line 3 as an antenna line is increased, and the reception performance of the mobile station 4 from the antenna line is improved, and the power line 3 is fixed. The reception state at the station 2 is also improved.

FIG. 2 shows a second embodiment of the present invention, in which five switches at the tip of the power line 3 and five switches at the tip of a different power line 3 'of an adjacent system are provided. A loop antenna-like connector 7 for transmitting and receiving signals is provided at the end of each of the power lines 3 and 3 ', and an LC circuit 10 in which a coil 8 and a capacitor 9 are connected in series is connected between these connectors. , Both ends 1 of this LC circuit 10
0a is grounded, and resonance occurs at both ends of these LC circuits 10.

As a result, one of the power lines 3 is grounded at the distribution board 3a and the other power line 3 'is grounded at the distribution board 3'a. Constitutes a ground return system. In addition, since the LC circuit 10 resonates, the function of the power line 3, 3 'as an antenna line is increased, the reception performance at the mobile station 4 from this antenna line is improved, and the reception at the fixed station 2 is performed. The condition also improves.

In the above embodiment, the fixed station is provided in the road, but the present invention is not limited to this. The fixed station may be provided on the ground near the opening of the road. Further, in the above-described embodiment, the electric light line 3 and the electric wire 6 or the electric light line 3 and the electric light line 3 ′ are connected by a loop antenna-like connector for transmitting and receiving signals, but the present invention is not limited to this. Any connection device that transmits and receives signals may be used.

[0013]

According to the first aspect of the present invention, a power line in a road is used as an antenna line. Even if one end of the power line is not grounded, a lead wire is connected to the end of the power line. By grounding this one end, a ground return system is formed, and since these connections are made to resonate via the LC circuit, the sensitivity of the antenna line is improved, and the fixing through this antenna line is performed. Transmission and reception between the station and the mobile station are extremely good without noise.

Further, the invention according to claim 2 uses a power line in the road as an antenna line, and even if one end of the power line is not grounded, the end of the power line is connected to an adjacent another system. By connecting to a power line, a ground return system is formed, and these connections are made via an LC circuit.
In addition, since resonance occurs, the sensitivity of the antenna line is improved, and transmission and reception between the fixed station and the mobile station via the antenna line are extremely good without noise.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a second embodiment of the present invention.

FIG. 3 is a schematic configuration diagram showing a conventional example.

FIG. 4 is a schematic configuration diagram showing another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Road 1a Opening 2 Fixed station 3 Light line 3 'Light line 4 Mobile station 5 Switch 6 Conductor 7 Connector 8 Coil 9 Capacitor 10 LC circuit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B 5/00 H04B 3/54

Claims (2)

(57) [Claims] 1. A fixed station is provided on the ground or in a road near an opening of a road, and an information signal of the fixed station is converted into an FM wave signal, and the fixed station is connected to an existing power line in the road. In an information transmission circuit for transmitting and receiving an information signal to and from the fixed station by a mobile station including a receiver at an appropriate place in a road where the existing power line is used as an antenna line, a conductor is provided separately from the power line, and one end of the conductor is provided. Grounding, providing a connector for transmitting and receiving signals to each of the lead wire and the power line, providing an LC circuit connected in series between these connectors, and grounding both ends of the LC circuit to obtain a resonance configuration. An information transmission device in Todo, characterized by the following. 2. A fixed station is provided on the ground or in a road near an opening of a road, and an information signal of the fixed station is converted into an FM wave signal, and the fixed station is connected to an existing power line in the road. In an information transmission circuit for transmitting and receiving information signals to and from the fixed station by a mobile station comprising a receiver at an appropriate place in a road where the existing power line is used as an antenna line, the power line having a different system from the power line is used. A connector for transmitting and receiving signals to each of the light lines, and an LC circuit connected in series between these connectors, and both ends of the LC circuit are grounded to obtain resonance. Information transmission equipment in the road.