JP5520780B2 - Vehicle communication device - Google Patents

Description

  The present invention relates to a vehicle communication device, and more particularly, to a vehicle communication device for communicating with an IC tag in a cab of a vehicle.

  Conventionally, as a communication device, for example, a device described in Patent Document 1 is known. In such a communication device, when a person having an IC tag passes through a magnetic field (roadside magnetic field) generated in a trigger region on the passage, the IC tag is activated by the magnetic field and includes a unique ID number from the IC tag. Radio waves are transmitted. Then, by receiving such radio waves, human dynamics management is performed.

JP 2008-152373 A

  Generally, in large vehicles such as heavy machinery and trucks, driving by a licensed designated person is subject to management, so the driver is identified not as a vehicle body but as a designated person. is important. Therefore, it is reasonable to attach an IC tag to an object that can be attached to the inside of the helmet or the driver, and it is necessary to activate the IC tag in the cab.

  Here, in the above-described conventional technology, for example, when the worker moves by walking in the dynamic management of the worker in construction work or the like, the dynamic management is possible by the worker holding the IC tag. On the other hand, when a worker gets on board the cab of a large vehicle and moves, the IC tag attached to the worker passes through a position away from the roadbed, so that the magnetic field energy on the roadside moves away from the roadbed. Due to the diffusion, a sufficient magnetic field strength for activating the IC tag may not be obtained. In addition, in this case, a sufficient magnetic field strength for starting the IC tag cannot be obtained because the roadside magnetic field may be canceled or bent depending on the shape or material of the vehicle body in the cab. Sometimes. Therefore, when the IC tag in the driver's cab of the vehicle is the activation target, it may be difficult to activate the IC tag.

  Accordingly, an object of the present invention is to provide a vehicle communication device that can reliably start an IC tag in a driver's cab of a vehicle.

  In order to solve the above-described problems, a vehicle communication device according to the present invention is a vehicle communication device for communicating with an IC tag in a driver's cab of a vehicle, and includes at least one provided on the outer surface side of the vehicle body of the vehicle. A relay circuit having a first coil part and at least one second coil part electrically connected to the first coil part and provided in or near the cab of the vehicle body; Is characterized in that an induced current is excited by electromagnetic induction by a road-side magnetic field, and the second coil section generates a magnetic field that activates the IC tag when the induced current flows.

  In this vehicle communication device, when a vehicle enters a magnetic field generated on the road side, an induced current is excited in the first coil portion on the outer surface side of the vehicle body by the road-side magnetic field (hereinafter simply referred to as “road-side magnetic field”). . When the induced current flows through the second coil portion, a magnetic field that activates the IC tag in the second coil portion (hereinafter simply referred to as “starting magnetic field”) is generated. Is activated. Therefore, even when the strength of the roadside magnetic field is insufficient in the cab, the IC tag in the cab can be reliably activated.

  Moreover, it is preferable that the 1st coil part is provided in the bottom part of the vehicle body. In this case, the first coil portion is disposed close to the road side, and electromagnetic induction due to the road-side magnetic field can be suitably generated.

  Moreover, it is preferable that the 1st coil part is provided in the side surface in the front side of a vehicle body. In this case, the first coil portion can be easily provided on the vehicle body.

  Moreover, it is preferable that the 2nd coil part is provided in at least one of the ceiling part and rear wall part of a driver's cab. Thereby, while being able to suppress that a 2nd coil part obstruct | occludes a passenger | crew, it becomes possible to generate | occur | produce a starting magnetic field easily in the whole cab.

  Moreover, it is preferable that the 2nd coil part is provided in the seat. Thereby, it can suppress that a 2nd coil part obstruct | occludes a passenger | crew. At the same time, when an IC tag is attached to a vehicle occupant, the second coil portion is disposed close to the IC tag. Can be affected.

  The relay circuit is preferably configured to resonate with the frequency in the roadside magnetic field. In this case, electromagnetic induction by the roadside magnetic field can be more suitably generated.

  Here, the road-side magnetic field may be generated by a road-side coil provided in the road bed or on the side of the road bed.

  At this time, it is preferable that the winding axis direction of the first coil portion is parallel to the winding axis direction of the road-side coil portion. In this case, when the vehicle passes through the magnetic field generated on the road side, a substantially constant induced current can be excited during the passage.

  Moreover, it is preferable that the winding axis direction of a 1st coil part cross | intersects with respect to the winding axis direction of a roadside coil part. In this case, when the vehicle passes through the magnetic field generated on the road side, it is possible to excite an induced current having a plurality of peaks that suddenly rise and fall.

The second coil portion is provided in the vicinity of the cab or the cab body, constitutes a receiving antenna for receiving a radio wave transmitted from the IC tag, the first coil portion, the body of the vehicle It is preferable to configure a transmitting antenna unit that is provided on the outer surface side and transmits a radio wave received by the receiving antenna unit. In this case, the radio wave transmitted from the IC tag in the driver's cab is received by the second coil unit as the receiving antenna unit, and is transmitted outside the vehicle from the first coil unit as the transmitting antenna unit. Therefore, even when the second coil portion is also used as the receiving antenna portion and the first coil portion is also used as the transmitting antenna portion, the radio wave in the cab is easily lost without jumping out of the vehicle due to the influence of the vehicle body. Can be reliably propagated outside the vehicle.

  According to the present invention, it is possible to reliably start an IC tag in a cab of a vehicle.

1 is a schematic configuration diagram illustrating a vehicle communication device according to a first embodiment of the present invention. It is a schematic enlarged view which shows the driver's cab of the vehicle by which the vehicle communication apparatus of FIG. 1 is mounted. It is a circuit diagram which shows the relay circuit in the communication apparatus for vehicles of FIG. It is a figure which shows the pick-up coil of the relay circuit in the vehicle communication apparatus of FIG. It is a figure for demonstrating the effect | action of the relay circuit in the communication apparatus for vehicles of FIG. It is a graph which shows the strength of the induced current which generate | occur | produces in the relay circuit in the communication apparatus for vehicles of FIG. It is a figure which shows the pick-up coil of the relay circuit in the vehicle communication apparatus which concerns on 2nd Embodiment of this invention. It is a graph which shows the strength of the induced current which generate | occur | produces in the relay circuit in the vehicle communication apparatus of FIG. It is a figure which shows the communication apparatus for vehicles which concerns on 3rd Embodiment of this invention. It is a figure which shows the relay circuit in the communication apparatus for vehicles which concerns on 4th Embodiment of this invention. It is a schematic perspective view which shows the vehicle by which the vehicle communication apparatus which concerns on 5th Embodiment of this invention is mounted. It is a schematic perspective view which shows the vehicle by which the vehicle communication apparatus which concerns on 6th Embodiment of this invention is mounted. It is a schematic perspective view which shows the vehicle by which the other example of the vehicle communication apparatus of FIG. 12 is mounted. It is a schematic perspective view which shows the vehicle carrying the vehicle communication apparatus which concerns on 7th Embodiment of this invention. It is a schematic perspective view which shows the vehicle by which the vehicle communication apparatus which concerns on 8th Embodiment of this invention is mounted. It is a figure which shows the other example of a trigger coil.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the same or equivalent elements will be denoted by the same reference numerals, and redundant description will be omitted.

[First Embodiment]
First, a first embodiment of the present invention will be described. FIG. 1 is a schematic configuration diagram showing a vehicle communication device according to a first embodiment of the present invention, and FIG. 2 is a schematic enlarged view showing a cab of a vehicle on which the vehicle communication device of FIG. 1 is mounted. As shown in FIG. 1, the vehicle communication device 1 is mounted on a vehicle 10 and communicates with an IC tag 12 in a cab 11 of the vehicle 10.

  The vehicle communication device 1 here is used for gate management (zone management) of an occupant 13 boarding the vehicle 10. Specifically, the vehicle communication device 1 activates the IC tag 12 attached to the occupant 13 by using the trigger magnetic field B <b> 1 on the road side 14, and transmits radio waves (electromagnetic waves) P from the IC tag 12. Then, by receiving the radio wave P by the receiving antenna 15, it grasps and manages the dynamics such as entrance / exit and passage of the passenger 13.

  The vehicle 10 is a vehicle in which it is difficult for the trigger magnetic field B1 on the roadside 14 to reach the cab 11. Examples of the vehicle 10 include a large vehicle (a large bus such as a microbus, a 25 t class vessel truck, etc.), a cash transport vehicle and a special vehicle that do not have a glass window other than the driver's seat. The trigger magnetic field B1 is a trigger signal generated by applying a current from the magnetic field generator 18 to the trigger coil 17 embedded in the roadbed 16, and has a frequency of, for example, 93 kHz band. The trigger coil 17 extends along the roadbed 16 so as to be wound with the vertical direction as the winding axis direction (winding direction).

  The IC tag 12 has a unique identification ID associated with the occupant 13, for example. While the IC tag 12 is normally in a resting state, the IC tag 12 is activated by detecting a magnetic field and transmits a radio wave P as a radio signal including an identification ID. As the IC tag 12 here, a non-directional tag whose performance does not depend on the installation direction is used. The receiving antenna 15 is provided on the roadside 14, receives the radio wave P transmitted from the IC tag 12, and transmits it to management means (not shown) such as a PC.

  The vehicle communication device 1 according to this embodiment includes a pickup coil (first coil portion) 2 and an output coil (second coil portion) electrically connected to the pickup coil 2 by a pull-in twist cable 9. 3) and 3).

  The pickup coil 2 is for exciting the induced current by electromagnetic induction by the trigger magnetic field B1. The pickup coil 2 has a predetermined size and is provided so as to be exposed on the outer surface (outer surface) side of the vehicle body 19 of the vehicle 10. Here, the pickup coil 2 is attached to the front bottom portion of the vehicle body 19 so as to be close to the roadbed 16. ing. As shown in FIG. 2, the output coil 3 is for generating an activation magnetic field B <b> 2 for activating the IC tag 12. The output coil 3 has a predetermined size and is provided in the cab 11, and here, is attached to the back surface of the seat 20.

但し、Ｌｐ：ピックアップコイルのインダクタンス
Ｌｏ：アウトプットコイルのインダクタンス
Ｃｒ：コンデンサのキャパシタンス FIG. 3 is a circuit diagram showing a relay circuit in the vehicle communication device of FIG. As shown in FIG. 3, in the relay circuit 5, the pickup coil 2 and the output coil 3 are connected in series. The relay circuit 5 is connected to the capacitor 4 so as to resonate with the frequency of the trigger magnetic field B1, thereby forming a closed circuit. For example, the relay circuit 5 is configured such that the resonance frequency f is equal to the frequency (93 kHz band) in the trigger magnetic field. The resonance frequency f here can be calculated by the following equation (1).

Where Lp: inductance of the pickup coil Lo: inductance of the output coil Cr: capacitance of the capacitor

  4A is a side sectional view showing the pickup coil, and FIG. 4B is a sectional view taken along line IV-IV in FIG. 4A. As shown in FIG. 4, the pickup coil 2 is formed of a thin plate-like copper wire, and is wound in a spiral shape with the vertical direction as the winding axis direction. That is, the winding axis direction of the pickup coil 2 is parallel to the winding axis direction of the trigger coil 17. The pickup coil 2 is sandwiched and held between a plate-like cover 2a formed of engineer plastic outside the vehicle body 19 and an iron plate 2b formed of stainless steel inside the vehicle body 19.

  The cover 2a and the iron plate 2b are provided with mounting holes 2c through which mounting screws 21 to the vehicle body 19 are inserted. A ferrite material 2d having a high relative magnetic permeability is interposed between the pickup coil 2 and the iron plate 2b, thereby reducing the generation of eddy currents by the iron plate 2b. Further, the intersecting portion of the pickup coil 2 is covered with an insulating material 2e, thereby preventing a short circuit.

  In the vehicle communication device 1 configured as described above, as shown in FIGS. 1 and 5, when the vehicle 10 passes over the trigger region R in which the trigger coil 17 is embedded in the roadbed 16, it is generated in the trigger coil 17. When the vehicle 10 enters the trigger magnetic field B 1, an induction magnetic field B 3 induced and repelled by the trigger magnetic field B 1 is generated in the pickup coil 2, the induced current is excited, and the induced current flows through the relay circuit 5. Then, when this induced current flows through the output coil 3, an activation magnetic field B2 is generated around the seat 20 (see FIG. 2).

  Thereby, the IC tag 12 detects and activates the magnetic field, and the radio wave P is transmitted from the IC tag 12. As a result, the transmitted radio wave P is received by the receiving antenna 15, the identification ID included in the radio wave P is read and processed, and entrance / exit management of the occupant 13 is performed.

  By the way, the cab 11 of the vehicle 10 is generally an electromagnetically sealed space surrounded by metal and completely / incompletely shielded magnetically, so that the trigger magnetic field B1 is weak inside. It is easy to become. In particular, in the vehicle 10 that is a large vehicle, since the position of the cab 11 is high and away from the roadbed 16, the trigger magnetic field B1 in the cab 11 may be very weak. Moreover, in the cab 11, due to the material and shape of the vehicle body 19, the trigger magnetic field B1 may be further weakened due to the trigger magnetic field B1 being canceled or bent.

  In this respect, in the present embodiment, as described above, the pickup coil 2 is arranged so as to correspond to the trigger coil 17 on the roadside 14, and the output coil is located in the vicinity of the cab 11 where the IC tag 12 is to be activated. 3 is arranged. Then, an induced current is excited in the pickup coil 2 by the trigger magnetic field B1, the induced current flows to the output coil 3, and the starting magnetic field B2 is generated by the output coil 3, and the IC in the cab 11 is generated by the starting magnetic field B2. Tag 12 is activated. Therefore, according to the present embodiment, even when the strength of the trigger magnetic field B1 on the roadside 14 is insufficient for the activation of the IC tag 12 in the cab 11, the IC tag 12 in the cab 11 is reliably activated. Is possible.

  In particular, in the present embodiment, it is sufficient to mount the relay circuit 5 on the vehicle 10 and the cost for constructing the equipment on the roadside 14 is not required. Therefore, it can be said that the above-described effects can be realized inexpensively and easily.

  In the present embodiment, as described above, since the pickup coil 2 is provided at the bottom of the vehicle body 19, the pickup coil 2 is disposed close to the roadbed 16 in which the trigger coil 17 is embedded. . Therefore, electromagnetic induction by the trigger magnetic field B1 can be suitably generated by the pickup coil 2.

  Moreover, in this embodiment, since the output coil 3 is provided in the seat 20 as mentioned above, it can suppress that the output coil 3 obstruct | occludes a passenger | crew. Furthermore, the output coil 3 can be disposed close to the IC tag 12 attached to the occupant 13, and the starting magnetic field B <b> 2 generated by the output coil 3 suitably reaches the IC tag 12.

  In the present embodiment, as described above, since the relay circuit 5 is configured to resonate with the frequency of the trigger magnetic field B1, electromagnetic induction by the trigger magnetic field B1 can be more suitably generated. .

  Further, since the pickup coil 2 of the present embodiment has a plate-like laminated structure sandwiched between the cover 2a and the iron plate 2b and is installed at the bottom portion of the vehicle body 19, the pickup coil 2 is mechanically not bulky. It can be attached to the vehicle body 19 in a robust state.

  FIG. 6 is a graph showing the intensity of the induced current generated in the relay circuit in the vehicle communication device of FIG. The vertical axis in the figure indicates the strength of the induced current, and the horizontal axis indicates the position of the vehicle 10 (pickup coil 2) on the roadbed 16. The pickup coil 2 here is installed at the bottom of the vehicle body 19 so as to be positioned 40 cm above the roadbed 16, for example, and the width of the trigger region R in the vehicle traveling direction is 1.7 m. These are the same in FIG.

  As shown in FIG. 6, in the induced current generated in the present embodiment, for example, when the vehicle 10 travels from the left to the right on the roadbed 16 in FIG. When entering, it rises to a certain value I1. And it is maintained as it is during the passage of the trigger region R, and falls when leaving the trigger region R. In other words, in the present embodiment, an induced current having a substantially constant strength can be excited during the passage of the trigger magnetic field B1. This is because the winding axis direction of the pickup coil 2 is parallel to the winding axis direction of the trigger coil 17. As a result, the output coil 3 can generate a starting magnetic field B2 having a substantially constant strength for a certain period of time during the passage of the trigger region R, and the IC tag 12 can be reliably and stably started. .

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In the description of the present embodiment, differences from the first embodiment will be mainly described.

  FIG. 7 is a diagram showing a pickup coil of the relay circuit in the vehicle communication device according to the second embodiment of the present invention. As shown in FIG. 7, the vehicle communication device of the present embodiment is different from the vehicle communication device 1 in that a pickup wound around a shaft 31 having a rectangular cross section instead of the pickup coil 2 (see FIG. 4). The relay circuit 30 having the coil 32 is provided.

  The shaft body 31 is made of ferrite having a high relative magnetic permeability and extends in the horizontal direction. The pickup coil 32 is wound around the shaft body 31 with the horizontal direction as the winding axis direction. That is, the winding axis direction of the pickup coil 32 is orthogonal to (intersects) the winding axis direction of the trigger coil 17. The pickup coil 32 has a plastic mold on its outer surface.

  Also in the present embodiment configured as described above, an induced magnetic field B3 that is induced and repels by the trigger magnetic field B1 is generated in the pickup coil 32, the induced current is excited, and this induced current flows to the output coil 3 to start the magnetic field. B2 is generated. Therefore, also in this embodiment, the above-described effect of reliably starting the IC tag 12 in the cab 11 is achieved.

  FIG. 8 is a graph showing the intensity of the induced current generated in the relay circuit in the vehicle communication device of FIG. The vertical axis in the figure indicates the strength of the induced current, and the horizontal axis indicates the position of the vehicle 10 (pickup coil 32) on the roadbed 16.

  As shown in FIG. 8, when the vehicle 10 enters the trigger region R, the induced current generated in the present embodiment rises steeply to the peak value I2 and falls steeply. Further, when exiting from the trigger region R, it rises steeply to the peak value I2, and then falls steeply. That is, in this embodiment, the induced current can be excited so that there are a plurality (two) of sharp peaks that deviate from the center of the trigger region R. This is due to the winding axis direction of the pickup coil 32 intersecting (orthogonal) with the winding axis direction of the trigger coil 17. As a result, the output coil 3 can generate a starting magnetic field B2 that rises sharply when entering and leaving the trigger region R, compared to the case where these winding axis directions are arranged parallel to each other. By adjusting the activation characteristics of 12, the IC tag 12 can be reliably activated.

[Third Embodiment]
Next, a third embodiment of the present invention will be described. In the description of the present embodiment, differences from the first embodiment will be mainly described.

  FIG. 9 is a diagram showing a vehicle communication device according to the third embodiment of the present invention. As shown in FIG. 9, the vehicle communication device of this embodiment is different from the vehicle communication device 1 in that a tag receiving antenna (receiving antenna unit) 42 and a tag transmitting antenna (transmitting antenna) connected by a coaxial cable 41. Part) 43 is further provided.

  The tag receiving antenna 42 is for receiving the radio wave P transmitted from the IC tag 12. The tag receiving antenna 42 is provided in the cab 11 and is attached in the vicinity of the output coil 3 here. The tag transmission antenna 43 is for transmitting the radio wave P received by the tag reception antenna 42 to the outside of the vehicle. The tag transmission antenna 43 is provided outside the vehicle body 19 and is attached in the vicinity of the pickup coil 2 here. The coaxial cable 41 is provided along the twist cable 9.

  As described above, also in the present embodiment, the above-described effect of reliably starting the IC tag 12 in the cab 11 is achieved. Furthermore, in the present embodiment, the radio wave P transmitted from the IC tag 12 is received by the tag receiving antenna 42 in the cab 11, transmitted by the coaxial cable 41, and transmitted outside the vehicle by the tag transmitting antenna 43. The radio wave P is received by a road-side receiving antenna 44 provided in the vicinity of the trigger coil 17 of the roadbed 16. Thus, according to this embodiment, even when the radio wave P transmitted in the cab 11 is likely to disappear without jumping out of the vehicle, the radio wave P can be reliably propagated outside the vehicle.

  For example, when the roadside reception antenna 44 is not provided, the tag transmission antenna 43 may be constituted by a whip antenna or the like installed on the vehicle body 19. Similarly, the tag receiving antenna 42 may also be a whip antenna or the like.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described. In the description of the present embodiment, differences from the first embodiment will be mainly described.

  FIG. 10 is a diagram illustrating a relay circuit in the vehicle communication device according to the fourth embodiment of the present invention. As shown in FIG. 10, the vehicle communication device of this embodiment is different from the vehicle communication device 1 in that it can be used as a loop antenna instead of the pickup coil 2 and the output coil 3 (see FIG. 5). The relay circuit 50 having the pickup coil 51 and the output coil 52 is provided.

  The output coil 52 has a function as a tag receiving antenna (receiving antenna unit) that receives the radio wave P transmitted from the IC tag 12. The pickup coil 51 has a function as a tag transmitting antenna (transmitting antenna unit) that transmits the radio wave P received by the output coil 52. As the pickup coil 51 and the output coil 52 here, for example, a loop coil having a diameter suitable for 310 MHz is used. The relay circuit 50 includes capacitors 53 and 53 connected in parallel, and is configured to resonate with the frequency (93 kHz band) of the trigger magnetic field B1.

  As described above, also in the present embodiment, the above-described effect of reliably starting the IC tag 12 in the cab 11 is achieved. Furthermore, in the present embodiment, the radio wave P transmitted from the IC tag 12 is received by the output coil 52 in the cab 11 and transmitted outside the vehicle by the pickup coil 51. Therefore, according to the present embodiment, even when the radio wave P transmitted in the cab 11 is likely to disappear without jumping out of the vehicle, the radio wave P can be reliably propagated outside the vehicle.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described. In the description of the present embodiment, differences from the first embodiment will be mainly described.

  FIG. 11 is a schematic perspective view showing a vehicle equipped with a vehicle communication device according to the fifth embodiment of the present invention. As shown in FIG. 11, the vehicle communication device of the present embodiment is different from the vehicle communication device 1 in that the vehicle body 19 is replaced with a pickup coil 2 (see FIG. 1) attached to the bottom on the front side. It is the point provided with the pick-up coil 61 attached to the front surface (front part) of 19. The pickup coil 61 here is provided on the front bumper 62 of the vehicle body 19.

  Even in this embodiment, the above-described effect of reliably starting the IC tag 12 in the cab 11 is achieved. In the present embodiment, the pickup coil 61 can be easily provided on the vehicle body 19.

[Sixth Embodiment]
Next, a sixth embodiment of the present invention will be described. In the description of the present embodiment, differences from the first embodiment will be mainly described.

  FIG. 12 is a schematic perspective view showing a vehicle equipped with a vehicle communication device according to the sixth embodiment of the present invention. As shown in FIG. 12, the vehicle communication device of the present embodiment is different from the vehicle communication device 1 in that a vehicle body 19 is used instead of the pickup coil 2 (see FIG. 1) attached to the front bottom portion of the vehicle body 19. It is the point provided with the pickup coil 71 attached to the side surface of the front side. The pickup coil 71 here is provided on the side bumper 72 of the vehicle body 19.

  Even in this embodiment, the above-described effect of reliably starting the IC tag 12 in the cab 11 is achieved. In the present embodiment, the pickup coil 61 can be easily provided on the vehicle body 19.

  In the present embodiment, the side door 73 may be provided with a pickup coil 71. As shown in FIG. 13, a pickup coil 71 may be provided on the side body (side skirt) 74. That is, the pickup coil 71 may be provided on the side surface (side) of the vehicle body 19.

[Seventh Embodiment]
Next, a seventh embodiment of the present invention will be described. In the description of the present embodiment, differences from the first embodiment will be mainly described.

  FIG. 14 is a schematic perspective view showing a vehicle equipped with a vehicle communication device according to the seventh embodiment of the present invention. As shown in FIG. 14, the vehicle communication device of the present embodiment is different from the vehicle communication device 1 in that the vehicle communication device 1 is attached to the seat 20 in the cab 11 and replaced with the output coil 3 (see FIG. 1). This is the point that an output coil 82 provided on the ceiling 81 of the cab 11 is provided.

  Even in this embodiment, the above-described effect of reliably starting the IC tag 12 in the cab 11 is achieved. In the present embodiment, the output coil 82 can be prevented from interfering with the occupant 13 in the cab 11, and the starting magnetic field B2 can be easily generated in the entire cab 11. Thus, the IC tag 12 can be reliably activated regardless of the posture and position of the occupant 13 in the cab 11.

[Eighth Embodiment]
Next, an eighth embodiment of the present invention will be described. In the description of the present embodiment, differences from the first embodiment will be mainly described.

  FIG. 15: is a schematic perspective view which shows the vehicle by which the vehicle communication apparatus which concerns on 8th Embodiment of this invention is mounted. As shown in FIG. 15, the vehicle communication device of the present embodiment is different from the vehicle communication device 1 in that the vehicle communication device 1 is attached to the seat 20 in the cab 11 and replaced with the output coil 3 (see FIG. 1). The output coil 92 is provided on the rear wall 91 of the cab 11.

  Even in this embodiment, the above-described effect of reliably starting the IC tag 12 in the cab 11 is achieved. In the present embodiment, the output coil 92 can be prevented from interfering with the occupant 13 in the cab 11, and the starting magnetic field B2 can be easily generated in the entire cab 11. Thus, the IC tag 12 can be reliably activated regardless of the posture and position of the occupant 13 in the cab 11.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments. The present invention is modified without departing from the scope described in the claims or applied to others. It may be.

  For example, the number of turns and the size (size) of the pickup coil 2 and the output coil 3 are not limited to the above embodiment, and can be set as appropriate depending on the type of the vehicle 10, the use / purpose of the vehicle communication device, and the like. . Further, the relay circuit of the above embodiment has one pickup coil 2 and one output coil 3, but the relay circuit may have a plurality of pickup coils 2 and a plurality of output coils 3. Good.

  Further, the arrangement positions of the pickup coil and the output coil are not limited. For example, the relay circuit may be configured by combining any of the pickup coil and the output coil of each of the above embodiments. In short, the pickup coil 2 may be provided as appropriate based on, for example, the magnetic field strength of the trigger magnetic field B1 created by the trigger coil 17, the starting characteristics of the IC tag 12, the traveling position of the vehicle 10, etc. The IC tag 12 in the cab 11 may be provided in the cab 11 or in the vicinity of the cab 11 that can be activated by the activation magnetic field B2.

  Further, as shown in FIG. 16, the trigger coil 17 provided on the roadside 14 may be embedded for each lane in the roadbed 16, and a plurality of trigger coils 17 are embedded along the vehicle traveling direction. Also good. Further, as shown in the figure, in the tunnel 70, a plurality of trigger coils (road side coil portions) 17x may be provided on the side wall portion of the roadbed 16, or a plurality of trigger coils 17y at the top end portion thereof. May be provided. If the trigger coil 17 is installed on the roadbed 16, the trigger coil 17 may be damaged when the vehicle 10 travels. However, if the trigger coil 17 is installed on the side of the roadbed 16, the trigger coil 17 may be damaged. The nature becomes less.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle communication apparatus, 2, 32, 51, 61, 71 ... Pick-up coil (1st coil part), 3, 82, 92 ... Output coil (2nd coil part) 5, 30, 50 ... Relay circuit, DESCRIPTION OF SYMBOLS 10 ... Vehicle, 11 ... Driver's cab, 12 ... IC tag, 14 ... Roadside, 16 ... Roadbed, 17 ... Trigger coil (roadside coil part), 17x ... Trigger coil (roadside coil part), 19 ... Car body, 20 ... Seat, 42 ... tag receiving antenna (receiving antenna portion), 43 ... tag transmitting antenna (transmitting antenna portion), 51 ... pickup coil (first coil portion, transmitting antenna portion), 52 ... output coil (second coil portion, receiving antenna) Part), 81 ... ceiling part, 91 ... rear wall part, B1 ... trigger magnetic field (magnetic field on the road side).

Claims (10)

A vehicle communication device for communicating with an IC tag in a driver's cab of a vehicle,
At least one first coil portion provided on the outer surface side of the vehicle body of the vehicle;
A relay circuit electrically connected to the first coil portion and having at least one second coil portion provided in or near the cab of the vehicle body;
The first coil portion excites an induced current by electromagnetic induction by a roadside magnetic field,
The vehicular communication device, wherein the second coil unit generates a magnetic field that activates the IC tag when the induced current flows.   The vehicle communication device according to claim 1, wherein the first coil portion is provided at a bottom portion of the vehicle body.   The vehicle communication device according to claim 1, wherein the first coil portion is provided on a side surface on a front side of the vehicle body.   The vehicle communication device according to any one of claims 1 to 3, wherein the second coil portion is provided on at least one of a ceiling portion and a rear wall portion of the cab.   The vehicle communication device according to any one of claims 1 to 4, wherein the second coil portion is provided in a seat.   The vehicular communication apparatus according to claim 1, wherein the relay circuit is configured to resonate with a frequency in the road-side magnetic field.   The vehicular communication device according to any one of claims 1 to 6, wherein the road-side magnetic field is generated by a road-side coil provided in the road bed or on the side of the road bed.   The vehicle communication device according to claim 7, wherein a winding axis direction of the first coil portion is parallel to a winding axis direction of the roadside coil portion.   The vehicle communication device according to claim 7 or 8, wherein a winding axis direction of the first coil portion intersects with a winding axis direction of the roadside coil portion. The second coil part is provided in the driver's cabin or in the vicinity of the driver's cab of the vehicle body, and constitutes a receiving antenna part for receiving radio waves transmitted from the IC tag,
The said 1st coil part is provided in the outer surface side of the vehicle body of the said vehicle, and comprises the transmitting antenna part for transmitting the electromagnetic wave received by the said receiving antenna part, The any one of Claims 1-9 characterized by the above-mentioned. The vehicle communication device according to one item.

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