JP2001052296A - Road facility equipment management system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a road facility equipment management system which can manage road facility equipment by making use of a data carrier. SOLUTION: The data carrier 30 has a magnetic core 35 made of unidirectionally oriented silicon steel, a coil 36 which is so provided that the Goss orientation of the magnetic core 35 is in the axial direction, and a storage means stored with property data on the electric lamp of a lighting device 10. The data carrier 30 is fitted to a metal-made part of the column part 12 of the lighting device 10. The magnetic core 35 of the data carrier 30 has magnetic characteristics which are intense only in one direction, and thus part of the magnetic field from the transmitting coil 21 of an interrogator 20 is guided in parallel to the magnetic ore 35 and the data carrier 30 and interrogator 20 are able to sufficiently send and receive signals. Consequently, the interrogator 20 sends and receives signals to and from the data carrier 30 by radio and can gather the property data stored in the storage means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a road equipment management system, and more particularly to a road equipment management system for managing road equipment such as road lighting lamps.

[0002]

2. Description of the Related Art Various types of road equipment, such as lighting devices and traffic lights, are provided on roads. With regard to such road equipment, for reasons such as ensuring the safety of vehicle traffic,
It is necessary to monitor whether an abnormality has occurred in the road equipment.

For this reason, for example, Japanese Patent Application Laid-Open No. 7-76809
In the publication, a system is provided in which a monitoring device is provided in each road facility device, an information collecting device is provided in a moving body, and the information collecting device wirelessly collects information from the monitoring device as the moving body moves. I have. In such a system, the monitoring device closely monitors, for example, the lighting device for insulation deterioration, non-lighting due to burnout of the light bulb, and other device abnormalities.

[0004]

By the way, actually,
For example, there is a demand for each lighting device to manage only the replacement time of the lighting lamp. If the above system is used to satisfy such demands, only a part of the functions will be used, which is wasteful. For this reason, realization of a road equipment management system suitable for performing simple management of road equipment is desired.

[0005] In order to realize this object, for example, it is conceivable to use a data carrier system. The data carrier system includes a data carrier in which an antenna and an IC chip are housed in a case, and an interrogator that wirelessly accesses the data carrier and exchanges data.

[0006] The data carrier is mounted on a road-installed body or the like (for example, in the case of a lighting device, its support, etc.) related to the road equipment, and the interrogator collects predetermined data stored in the data carrier. . However, since the on-road installation body is generally made of metal, the data carrier is attached to the metal portion of the on-road installation body.

FIG. 10A shows an example of a conventional data carrier. Such a data carrier 80 includes an air core coil 81 as an antenna for transmitting and receiving electromagnetic waves, an RFID module 82, and a plastic case 83.

The air-core coil 81 is formed by winding a conductive wire in a spiral shape.
Is housed in the case 83 so as to be perpendicular to the surface of the case 83. The RFID module 82 is a one-chip module in which a memory, a transmission / reception circuit, and the like are formed on a silicon substrate, and is connected to the air-core coil 81.

[0009] When performing the transmission and reception of signals between the data carrier 80 and the interrogator, as shown in FIG. 10 (b), the air-core in the axial direction a ₁ and the data carrier 80 of the interrogator antenna coil 91 as the axial direction a ₂ of the coil 81 are matched, to place the interrogator.

Then, the magnetic field generated by the antenna coil 91 of the interrogator is passed through the air core coil 81 of the data carrier 80, so that the data carrier 80 receives a signal from the interrogator. The interrogator receives a signal from the data carrier 80 by passing the magnetic field generated by the air core coil 81 through the antenna coil 91 of the interrogator.

However, when the data carrier is used by attaching it to a metal portion of a road-mounted body, the data carrier shown in FIG.
If the signal transmission / reception method shown in FIG. 2B is used, the magnetic field generated from the antenna coil of the interrogator is captured by the metal part of the road-mounted body and almost penetrates the air-core coil of the data carrier. And the communication with the interrogator cannot be performed.

In a conventional data carrier, an antenna and an IC are housed in a plastic case so that an external magnetic field can enter the case. This is because, if the case is made of a magnetic material having a high magnetic permeability, it becomes difficult for an external magnetic field to enter the case due to the magnetic shielding, and it becomes impossible to transmit and receive signals between the data carrier and the interrogator.

A plastic case is inferior in weather resistance and impact resistance, and there is a problem in using a conventional data carrier for outdoor installation. As described above, since the conventional data carrier is not suitable for being mounted on a metal part or being installed outdoors, it has actually been difficult to use the data carrier for a road equipment management system.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a road equipment management system capable of managing road equipment using a data carrier.

[0015]

According to a first aspect of the present invention, there is provided a road equipment management system according to the present invention, comprising: a road-installed body provided at least partially on a road; A magnetic core formed of a directional magnetic metal, a coil provided so that the goth direction of the magnetic core is oriented in the axial direction, and at least attribute data of road equipment related to the road-installed body are stored. A data carrier attached to a metal-made portion of the road-mounted body, wirelessly exchanges signals with the data carrier, and collects data stored in the storage means. And information collecting means.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a road equipment management system according to an embodiment of the present invention. As shown in FIG. 1, the road facility equipment management system according to the present embodiment includes a lighting device 10, an interrogator 20 as information collecting means, and a data carrier 30. The lighting device 10 includes a lighting lamp 11 and a column 12 on which the lighting lamp 11 is mounted, and is provided along a road.

Here, the electric light 11 corresponds to the road equipment of the present embodiment. The column 12 corresponds to the on-road installation body of the present embodiment, and a data carrier 30 is provided at a portion of the column 12 at least part of which is formed of metal. It is attached. In the present embodiment, a case will be described in which the lighting lamp 11 is managed by wirelessly transmitting and receiving signals between the interrogator 20 and the data carrier 30.

Next, the interrogator 20 will be described. FIG.
Is a block diagram showing a schematic configuration of the interrogator 20. FIG. 3 is a diagram showing a structure of a signal transmitted from the interrogator 20 to the data carrier 30. The interrogator 20 issues an instruction such as an inquiry to the data carrier 30.
As shown in the figure, the transmission coil 21, the reception coil 22,
Controller 23, modulation circuit 24, output amplifier 25
, Selection circuit 26, reception amplifier 27, detection circuit 28
And

The transmission coil 21 is for transmitting a signal from the controller 23 to the data carrier 30, and the reception coil 22 is for receiving a signal from the data carrier 30. Both the transmitting coil 21 and the receiving coil 22 are circular planar coils.

The receiving coil 22 is slightly smaller than the transmitting coil 21, and the transmitting coil 21 and the receiving coil 22
Are arranged on the same plane with their centers aligned. The controller 23 controls transmission of a signal about a command such as a question to the data carrier 30, and determines a reply content of the question based on a signal received from the data carrier 30.

The modulation circuit 24 modulates the binary signal sent from the controller 23 into an FSK modulation signal represented by a combination of signals of two different frequencies. The FSK modulation signal output from the modulation circuit 24 is sent to the output amplifier 25 and amplified, and then output to the transmission coil 21. Thus, the interrogator 20 emits a signal for a predetermined command from the transmission coil 21.

Here, the transmission signal generated by the controller 23 is, as shown in FIG. 3, specifically, an ID code representing the ID information of the data carrier 30 which is the transmission destination, It has an instruction code or the like representing an instruction.

For example, when requesting the data carrier 30 to transmit predetermined data, the instruction code includes
Contains information that requests data transmission. When writing predetermined data to the data carrier 30, the instruction code includes information indicating that data writing is requested,
Information about the contents of the data is entered.

The selection circuit 26 selects a signal having a predetermined frequency from the signals received by the reception coil 22. The signal selected by the selection circuit 26
, And is sent to the detection circuit 28. Detection circuit 2
Numeral 8 is for demodulating the signal sent from the selection circuit 26 into a binary signal. This binary signal is output to the controller 23.

Next, the data carrier 30 will be described. FIG. 4A is a schematic plan view of the data carrier 30, FIG. 4B is a schematic sectional view taken along line AA in FIG.
FIG. 4C is a schematic rear view of the data carrier 30. FIG. 5 is a diagram for explaining a method of protecting the coil of the data carrier 30, and FIG. 6 is a schematic block diagram of the data carrier 30. FIG. 7 is a diagram showing a structure of a signal transmitted from the data carrier 30 to the interrogator 20.

The data carrier 30 is shown in FIGS.
As shown in (c), the antenna device includes an antenna 31, a case 41 for receiving the antenna 31, and an RFID module 51. The antenna 31 is for transmitting and receiving signals to and from the interrogator 20, and has a plate-shaped magnetic core 35 and a coil 36. The magnetic core 35 is formed in a substantially rectangular shape.

The coil 36 is a circular air-core coil formed by winding a conducting wire a predetermined number of times in a plane. Many such air-core coils are commercially available,
Appropriate ones can be selected according to design requirements. Specifically, the inner diameter of the coil 36 is
Choose something larger than the width.

Then, the magnetic core 35 is inserted into the coil 36,
The antenna 31 is obtained by making the plane of the coil 36 and the plane of the magnetic core 35 substantially parallel. As described above, the coil 3 is attached to the flat magnetic core 35 as the antenna 31.
6 can be used to reduce the thickness of the case 41, so that the data carrier 30 can be made thinner.

As shown in FIG. 4, the case 41 has a substantially plate-shaped central portion 45 and two substantially plate-shaped ends 46a and 46b provided on both sides of the central portion 45. The surfaces of the central portion 45 and the end portions 46a and 46b are both formed flat.

Further, the central portion 45 and the end portions 46a, 46b
Is bent toward the back side. The length of the bent portion becomes the thickness of the case 41. Central part 45
Is fixed to the ends 46a, 46b by, for example, welding or caulking, with its back side overlapping part of the surface of the ends 46a, 46b.

In particular, when the caulking method is used, after caulking the central portion 45, the central portion 45 and the end portions 46a, 46
b between the center 45 and the ends 46a,
It is necessary to improve the hermeticity between the airbag and the airbag 46b.

In this embodiment, the magnetic core 35 and the case 4
1 is made of a silicon steel sheet (electromagnetic steel sheet) mainly used as an iron core of a transformer. In general, silicon steel sheets include a unidirectional type in which the direction in which magnetic flux easily passes is determined in one direction, and a non-directional type in which the direction in which magnetic flux easily passes is not defined.

In this embodiment, the magnetic core 35 and the case 4
As one material, a unidirectional silicon steel sheet is used. The direction in which the magnetic flux of the unidirectional silicon steel sheet easily passes is generally determined by the Goss orientation, which is the growth direction of crystal grains. In FIG. 4, the Goss directions of the respective parts are indicated by arrows.

That is, the magnetic core 35 has a Goss orientation of 3
5 is formed to face the longitudinal direction. Coil 36
Is inserted along the longitudinal direction of the magnetic core 35, so that the goth direction of the magnetic core 35 is parallel to the axial direction of the coil 36.

Here, the axial direction of the coil 36 refers to the direction of the magnetic core 35 passing through the coil 36. In the present embodiment, the vertical direction in FIG. The Goss directions of the two ends 46a and 46b are directed to the direction connecting them, while the Goss direction of the center 45 is directed to the direction orthogonal to the Goss directions of the ends 46a and 46b.

The antenna 31 has a structure in which the coil 36 has a central portion 45.
And a coil 36
Is placed in the case 41 so that the axial direction of the is directed to the direction connecting the two ends 46a and 46b.

Here, the length of the magnetic core 35 in the longitudinal direction is set such that the tip of the magnetic core 35 overlaps the ends 46a and 46b as much as possible when the antenna 31 is placed in the case 41. . In particular, the larger the overlapping area is, the better.

By arranging the antenna 31 in this manner, the goss direction of the central portion 45 is oriented in a direction orthogonal to the axial direction of the coil 36, and the goss directions of the end portions 46a and 46b are oriented in the axial direction of the coil 36. It turns to the direction parallel to.

The tip of the magnetic core 35 is connected to each end 46.
a, 46b are fixed by welding or soldering. Alternatively, instead of performing welding or the like, bonding may be performed with a material such as resin. Here, the adhesive may be conductive or non-conductive.

Such a data carrier 30 is attached to a portion of the support 12 of the lighting device 10 formed of metal. By the way, since the back side of the data carrier 30 is not covered, the antenna 31 is completely defenseless. Therefore, for example, the data carrier 30
When performing the mounting work, the coil 36 may be damaged.

Therefore, it is necessary to take some protective measures on the back side of the case 41. The present inventors have considered several methods for protecting the coil 36. FIG. 5 shows several methods for protecting the coil 35 of the data carrier 30.

A first method for protecting the coil 35 is shown in FIG.
As shown in (a), the inside of the case 41 is filled with a resin 47 such as silicon, for example, to thereby form the antenna 31.
It is to stop. The second method is shown in FIG.
As shown in (b), the back side of the case 41 is made of a non-metallic plate member 48 such as plastic or ceramic.
It is covered with.

The third method is as shown in FIG.
The plate member 4 is formed by using the plate member 49 made of unidirectional silicon steel.
9 so that the Goss direction of 9 is oriented in a direction orthogonal to the axial direction of the coil 36 and the plate-like member 49 and the central portion 45 do not form an electric closed circuit. It is intended to cover.

The reason why the Goss direction of the plate-like member 49 is oriented in a direction orthogonal to the axial direction of the coil 36 is as follows.
This is to prevent an external magnetic field in the axial direction of the coil 36 from being guided to the plate member 49.

The reason why the plate-like member 49 and the central portion 45 do not form a closed circuit is as follows. That is, if these form a closed circuit, when transmitting and receiving signals to and from the interrogator 20, the magnetic field passing through the coil 36 will also pass through this closed circuit, and current will flow through the closed circuit. Because it flows.

In the case of the example shown in FIG. 5C, the two plate-like members 49, 49 are attached to the back surface of the case 41 so that the gap 49a along the axial direction of the coil 36 is opened. I have. According to the third method, there is an advantage that almost the entire periphery of the antenna 41 except for the gap 49a can be covered with the same material (silicon steel).

However, when the data carrier 30 manufactured by the third method is used by attaching it to the metal portion of the column 12, the electric current flows between the case 41 and the metal portion of the column 12. Plate member 4 to prevent
It is necessary to insulate the data carrier 30 from the metal part by interposing a rubber, an insulating sheet or the like between the metal part 9 and the metal part.

As another method for protecting the coil 36, a method combining the first method and the second method or a method combining the first method and the third method is used. Can be used.

In such a data carrier 30, since the antenna 31 is placed in the case 41 formed of a unidirectional silicon steel plate, the antenna 31 can be covered from outside by a metal (silicon steel) case. Weather resistance and impact resistance can be improved. Therefore, such a data carrier 30 is particularly suitable for use for outdoor installation.

The RFID module 51 is a one-chip module in which a predetermined electric circuit is formed on a silicon substrate. As shown in FIG. 6, a capacitor 511, a rectifier circuit 512, a detection circuit 513, a controller 514
, ROM 515, RAM 516, and transmission circuit 517
And a transmission load transistor 518. RFI
Electrodes 55a and 55b of D module 51 (see FIG. 4)
Is connected to both ends of the coil 36 and the capacitor 5
11 is connected in parallel with the coil 36.

The resonance frequency of the resonance circuit formed by the coil 36 and the capacitor 511 is set to be substantially the same as the frequency of the AC signal sent from the modulation circuit 24 of the interrogator 20 to the coil 36.

The power of the data carrier 30 is used by converting the signal received by the above-described resonance circuit into direct current by the diode and the smoothing capacitor of the rectifier circuit 512. The detection circuit 513 detects the FS received by the coil 36.
This is to detect the K modulation signal.

The ROM 515 stores a predetermined program, and the RAM 516 stores attribute data of the lighting lamp 11 provided on the support 12 to which the data carrier 30 is attached. Here, data relating to the latest date when the lighting lamp 11 was replaced is used as the attribute data. By knowing the content of such attribute data, the maintenance person can determine the time to replace the lighting lamp 11.

The controller 514 determines the content of a command such as a question from the interrogator 20 based on the signal output from the detection circuit 513, and controls the transmission of a signal in response to the question.

Here, the transmission signal generated by the controller 514 is, specifically, as shown in FIG.
It has an ID code representing information, a response code representing the content of a response to the interrogator 20, and the like. For example, when transmitting the attribute data of the lighting lamp 11 to the interrogator 20, the response code contains information on the content of the attribute data.

The transmission circuit 517 modulates the power supply current received by the coil 36 based on the transmission signal from the controller 514, and AM-modulates and transmits the received signal. That is, when the transmission circuit 517 turns on / off the transmission load transistor 518 based on a signal from the controller 514,
The power supply load changes. Thereby, the signal received by the coil 36 is subjected to AM modulation at the same time as the reception, and a magnetic field is generated in the coil 36. Thus, data carrier 3
A signal corresponding to the inquiry from 0 is transmitted from the coil 36.

Next, a method of transmitting and receiving signals between the interrogator 20 and the data carrier 30 in the road equipment management system according to the present embodiment will be described. FIG.
FIG. 4 is a diagram for explaining an example of a method for transmitting and receiving a signal between the interrogator 20 and the data carrier 30.

Data carrier 3 used in this embodiment
At 0, since the Goss directions of the ends 46a and 46b of the case 41 are oriented in a direction parallel to the axial direction of the coil 36, when an external magnetic field in the axial direction of the coil 36 exists,
The external magnetic field is guided to the ends 46a and 46b of the case 41.

At this time, the goss direction of the central portion 45 of the case 41 is oriented in a direction orthogonal to the goss directions of the ends 46a and 46b, and the goss direction of the magnetic core 35 is set to the end 46.
a, 46b are directed in a direction parallel to the Goss direction, so that the external magnetic field guided to the end portions 46a, 46b hardly passes through the central portion 45, but passes through the magnetic core 35 toward the coil 36. Will go through. This means that the magnetic core 35
This is irrespective of whether or not the end portions 46a and 46b are fixed with a conductive material.

Therefore, in extreme cases, even if the magnetic core 35 and the end portions 46a and 46b are not fixed at all and the antenna 31 is simply put in the case 41, the end portions 46a and 46b
The external magnetic field guided to the coil 35
Penetrate. In this sense, it can be said that the two ends 46a and 46b play a role as a magnetic core.

Using this, a method of transmitting and receiving signals between the data carrier 30 and the interrogator 20 as described below can be considered. Now, as shown in FIG.
With the axial direction a ₁ of the transmitting coil 21 and the data carrier 30.
The axial direction a ₂ of the coil 36 is disposed substantially in parallel.

A magnetic field substantially parallel to the axial direction a ₁ is generated from the transmitting coil 21 of the interrogator 20, but the magnetic core 35 and the ends 46 a and 46 b of the data carrier 30 are aligned with the axial direction a _{2 of the} coil 35. Because it has strong magnetic properties in parallel directions,
A part of the magnetic field emitted from the transmission coil 21 of the interrogator 20 becomes a leakage magnetic field and becomes substantially parallel to the axial center direction a ₂ of the coil 36 around the data carrier 30.
a, 46b. As described above, in the present embodiment, signals can be transmitted and received between the data carrier 30 and the interrogator 20 using the leakage magnetic flux from the transmission coil 21 of the interrogator 20.

In particular, when the communication method using the leakage magnetic flux is applied, even when the data carrier 30 is mounted on the metal portion of the column 12, the communication between the data carrier 30 and the interrogator 20 is performed. Can transmit and receive a sufficient signal. However, in this case, it is necessary to interpose an insulating sheet or the like between the case 41 and the portion made of metal in order to prevent a current from flowing between them.

Next, a specific example of use of the road equipment management system according to the present embodiment will be described. In general, for the lighting device 10 installed on a road, it is necessary to monitor insulation deterioration, non-lighting, other device abnormalities, and the like.
In particular, if the lighting lamp 11 is left unlit due to its life, only the area around the lighting device 10 becomes dark at night, which is very dangerous for a driver of a car.

For this reason, the lighting lamp 11 is managed, and a new lighting lamp 11 is provided before the life of the lighting lamp 11 comes to an end.
Need to be replaced. In the example shown in FIG. 1, the lighting lamp 1 is used by using the road equipment management system of the present embodiment.
1 is managed for the replacement time.

As shown in FIG. 1, the maintenance person 100 has a hand-held type interrogator 20 and periodically operates the lighting devices 1.
By collecting attribute data of the lighting lamp 11 for 0, the lighting lamp 11 is managed. Specifically, first, the maintenance person 100 goes near a certain lighting device 10,
The direction of the interrogator 20 is adjusted so that the axial direction of the transmission coil 21 of the interrogator 20 is substantially parallel to the axial direction of the coil 36 of the data carrier 30.

Next, the maintenance staff 100 operates the interrogator 20 and issues a signal requesting the data carrier 30 to transmit the attribute data of the lighting lamp 11 from the interrogator 20. When the data carrier 30 receives the signal from the interrogator 20, the data carrier 30 determines the content of the signal, and sends a signal about the content of the attribute data stored in the RAM 516 to the coil 36.
Send from. Then, when receiving the signal from the data carrier 30, the interrogator 20 determines the content of the signal.

At this time, if the interrogator 20 has a function of displaying the content of the signal, etc., the maintenance person 100 looks at the content and determines by what time the lighting lamp 11 should be replaced at the latest. to decide.

On the other hand, if the interrogator 20 does not have a function of displaying the content of the signal, the interrogator 20 is returned to the office or the like, where the signal from the data carrier 30 is processed to display the signal. And so on.

The maintenance person 100 collects attribute data for each lighting device 10. Based on the attribute data of each lighting lamp 11 thus collected, it is determined when the replacement of each lighting lamp 11 is to be performed at the latest, that is, the time to replace the lamp. The maintenance person 100 performs the replacement work of the lighting lamp 11 at a predetermined date and time according to the determination.

When the replacement operation of the lighting lamp 11 is performed, the maintenance person 100 operates the interrogator 20 and sends a signal relating to the date of the current lamp replacement operation from the interrogator 20 to the data carrier 30. , Rewrite the attribute data stored in the RAM 516. By this, next time,
When collecting attribute data of the lighting lamp 11,
Lighting lamp 1 based on the updated attribute data
1 can be determined.

Incidentally, in FIG. 1, the maintenance person 100
Has been described, the collection of the attribute data of the lighting lamp 11 is performed. However, the interrogator 20 may be a mobile-mounted type. At this time, if the interrogator 20 is attached to, for example, a car, and the car is moved in front of each lighting device 10 to collect the attribute data of the lighting lamp 11, the attribute data can be easily collected. You can do so.

The road equipment management system according to the present embodiment has a magnetic core made of unidirectional silicon steel and a coil provided so that the goss direction of the magnetic core is oriented in the axial direction. A data carrier is used and attached to a metal part of a road-mounted body.

As a result, the magnetic core of the data carrier has a strong magnetic characteristic in one direction. Therefore, even when the data carrier is mounted on the metal part of the road-mounted body, the transmission coil of the interrogator can be used. A part of the magnetic field coming out of the device is guided in parallel to the magnetic core, so that a sufficient signal can be transmitted and received between the data carrier and the interrogator.

As described above, since the data carrier which is conventionally difficult to use is used, the road equipment management system of the present embodiment simplifies the management of the road equipment and saves labor. be able to.

Further, as a case of the data carrier, a central portion made of a unidirectional magnetic metal disposed opposite to the coil and having a Goss direction oriented in a direction substantially orthogonal to the axial direction of the coil, and a shaft of the coil are provided. Two ends made of a unidirectional magnetic metal whose Goss orientation is oriented in a direction substantially parallel to the axial direction of the coil, attached to both sides of the central part along a direction substantially parallel to the center direction. By using the one having, the end of the case can serve as a magnetic core.

Therefore, the data carrier receives an external magnetic field in the axial direction of the coil, and can transmit and receive signals to and from the interrogator satisfactorily. In addition, since the unidirectional silicon steel is used as the material of the case, the weather resistance and the impact resistance can be improved, and the data carrier is suitable for outdoor use.

The present invention is not limited to the above embodiment, and various modifications are possible within the scope of the invention. In the above-described embodiment, the case where the road equipment is the lighting lamp of the lighting device has been described.
The road equipment management system of the present invention can be applied to the case where various road equipment are managed.

At this time, the data carrier is attached to a road-mounted body associated with the road equipment. For example, when the road equipment is a light of a traffic light and the replacement time of the light of the traffic light is managed, a pillar portion of the traffic light is used as a road installation body.

Further, the road equipment is a wire or a wiring pipe built in a manhole, and when managing the type of such a wire or a wiring pipe, a manhole cover is used as a road installation body. However, when the data carrier is attached to the manhole cover, a concave portion is formed on the surface of the manhole cover, and the data carrier is embedded in the concave portion.

For example, in the above-described embodiment, the case where an air-core coil wound in a planar annular shape is used as the coil of the data carrier has been described.
As shown in (a), an air-core coil wound in a planar square or rectangular shape may be used as the coil 36a of the data carrier.

Such an air-core coil 36a is also commercially available. Further, as shown in FIG. 9B, as the coil 36b of the data carrier, a coil obtained by winding a conductive wire around the center of a plate-shaped magnetic core 35 a predetermined number of times may be used.

Furthermore, in the above-described embodiment, the case where unidirectional silicon steel is used as the material of the magnetic core and the case of the data carrier has been described. One-way magnetic metal can be used.

In the above embodiment, the case of the data carrier is made of unidirectional silicon steel as shown in FIG.
Although the case using the structure shown in FIG. 1 has been described, the case may be made of a non-metallic material having excellent weather resistance and impact resistance such as reinforced plastic.

[0085]

As described above, in the road equipment management system according to the present invention, a magnetic core formed of a unidirectional magnetic metal and a coil provided so that the goss direction of the magnetic core is oriented in the axial direction. Since the data carrier having the above structure is used and attached to the metal part of the road-mounted body, the magnetic core of the data carrier can have strong magnetic characteristics in one direction. Thereby, even when the data carrier is attached to the portion formed of metal of the road installation body, a part of the magnetic field emitted from the information collecting means is guided in parallel to the magnetic core, and the data carrier and the information collecting means Between the transmission and reception of sufficient signals, and the simple management of road equipment can be performed by using a data carrier which has been considered difficult to use in the past. .

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating an embodiment of the present invention and schematically illustrating a road equipment management system.

FIG. 2 is a schematic block diagram of an interrogator used in the road facility equipment management system.

FIG. 3 is a diagram showing a structure of a signal transmitted from an interrogator to a data carrier.

FIG. 4A is a schematic plan view of a data carrier used in the road equipment management system of the present embodiment, and FIG.
FIG. 2 is a schematic cross-sectional view of the data carrier along a line AA, and FIG. 2C is a schematic rear view of the data carrier.

FIG. 5 is a diagram for explaining a method of protecting a coil of a data carrier.

FIG. 6 is a block diagram illustrating a schematic configuration of a data carrier.

FIG. 7 is a diagram showing a structure of a signal transmitted from a data carrier to an interrogator.

FIG. 8 is a diagram for explaining an example of a method for transmitting and receiving signals between a data carrier and an interrogator in the road equipment management system of the present embodiment.

FIG. 9 is a diagram for explaining a modification of the data carrier used in the road facility equipment management system according to the present embodiment.

FIG. 10 is a diagram for explaining a conventional data carrier.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Illumination device 11 Illumination lamp 12 Prop part 20 Interrogator 21 Transmission coil 22 Receiving coil 23 Controller 24 Modulation circuit 25 Output amplifier 26 Selection circuit 27 Receiving amplifier 28 Detection circuit 30 Data carrier 31 Antenna 35 Magnetic core 36 Coil 41 Case 45 Center Parts 46a, 46b Ends 47 Resin 48 Non-metallic plate member 49 Plate member made of unidirectional silicon steel 49a Gap 51 RFID module 55a, 55b Electrode 511 Capacitor 512 Rectifier circuit 513 Detection circuit 514 Controller 515 ROM 516 RAM 517 Transmission circuit 518 Transmission load transistor

Claims (6)

[Claims] 1. A road-installed body provided on a road, at least a part of which is formed of metal, and is attached to a portion of the road-installed body formed of metal and formed of a unidirectional magnetic metal. And a coil provided so that the Goss direction of the magnetic core is oriented in the axial direction, and storage means for storing at least attribute data of road equipment related to the road-installed body. A road equipment management system, comprising: a data carrier; and an information collection unit that transmits and receives signals to and from the data carrier wirelessly and collects data stored in the storage unit. 2. The data carrier, wherein the magnetic core, the coil, and the storage means are arranged so as to face the coil and have a Goss direction in a direction substantially orthogonal to an axial direction of the coil. The goss orientation is oriented in a direction substantially parallel to the axial direction of the coil, which is attached to both sides of the central portion made of a non-magnetic metal and the central portion along a direction substantially parallel to the axial direction of the coil. The road equipment management system according to claim 1, wherein the case is housed in a case having two ends made of a unidirectional magnetic metal. 3. The coil is an air-core coil wound in a substantially annular shape in a plane, and the magnetic core is formed so that the plane of the plate-shaped magnetic core and the plane of the coil are substantially parallel. The road equipment equipment management system according to claim 1, wherein the device is inserted into the coil. 4. The coil is an air-core coil wound in a substantially rectangular shape on a plane, and the magnetic core is so formed that the plane of the plate-shaped magnetic core and the plane of the coil are substantially parallel. 3. The device according to claim 1, wherein said coil is inserted into said coil.
The road equipment management system according to 1. 5. The road equipment according to claim 1, wherein the on-road installation body is a support part of a lighting device, and the road equipment is an electric light of the lighting device. Equipment management system. 6. The road installation body is a manhole cover, and the road equipment is an electric wire or a conduit provided in the manhole.
The road equipment management system according to any one of claims 1 to 7.