JP2004023176A - On-vehicle apparatus for roadside-vehicle communication - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on-vehicle apparatus for roadside-vehicle communication that can direct an on-vehicle antenna in an optimum direction even when a vehicle having the on-vehicle apparatus for roadside-vehicle communication is parked at any position of a place with a roadside antenna installed therein and the vehicle is parked in any direction. <P>SOLUTION: The on-vehicle apparatus for roadside-vehicle communication mounted on the vehicle making information communication with a base station via the road side antenna installed at a prescribed place, includes: the on-vehicle antenna (10) used to make information communication with the road side antenna; an on-vehicle apparatus main body (8) on which the on-vehicle antenna (10) is mounted; and an on-vehicle apparatus main body turning mechanism (first and second supports 14, 15) for turnably supporting the on-vehicle apparatus main body (8). <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an in-vehicle device for road-vehicle communication for communicating with a base station via a roadside antenna installed at a predetermined place such as a parking lot and performing information communication such as music download.
This kind of on-vehicle device for road-to-vehicle communication is usually called a Dedicated Short Range Communications (DSRC) on-vehicle device, and will be hereinafter also referred to as a DSRC on-vehicle device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a DSRC vehicle-mounted device or a vehicle-mounted antenna constituting the DSRC vehicle-mounted device is fixedly disposed on a dashboard of a car or on a rear surface of a rearview mirror.
FIG. 10 is a diagram illustrating a state in which the vehicle equipped with the DSRC in-vehicle device and the roadside antenna are performing bidirectional communication.
In the figure, reference numeral 1 denotes a vehicle equipped with a DSRC in-vehicle device (also simply referred to as “car”), reference numeral 2 denotes a roadside antenna, and reference numeral 3 denotes a radio wave radiation pattern of an in-vehicle antenna constituting the DSRC in-vehicle device mounted in the vehicle 1 Reference numeral 4 denotes a radio wave radiation pattern of the roadside antenna 2, 5 denotes a communication cable, and 6 denotes a base station.
The radio wave radiation pattern 3 of the vehicle-mounted antenna constituting the DSRC vehicle-mounted device is fixed so as to face upward and in front of the vehicle.
[0003]
As shown in FIG. 10, when the vehicle 1 with the DSRC vehicle-mounted device comes near the roadside antenna 2, the radio wave radiation pattern 3 of the vehicle-mounted antenna forming the DSRC vehicle-mounted device faces the direction of the radio wave radiation pattern 4 of the roadside antenna 2. Therefore, two-way communication is possible.
Since the roadside antenna 2 transfers information to the base station 6 via the communication cable 5, information exchange (that is, information communication) between the vehicle 1 equipped with the DSRC vehicle-mounted device and the base station 6 can be performed.
[0004]
FIG. 11 shows a state in which a plurality of vehicles 1a, 1b,...
For example, the DSRC vehicle-mounted device or the vehicle-mounted antenna constituting the DSRC vehicle-mounted device is fixed on the dashboard of each of the vehicles 1a, 1b,... The radio wave radiation patterns 3a, 3b,..., 3n face upward and in front of the vehicle.
As shown in FIG. 11, the radio wave radiation pattern 4 of the roadside antenna 2 is one (that is, the direction of the radiowave radiation pattern 4 of the roadside antenna 2 is one direction), and each of the DSRC in-vehicle device-mounted vehicles 1a, 1b, Since the vehicle-mounted antenna of the DSRC vehicle-mounted device mounted on 1n cannot rotate, the radio wave radiation pattern of the vehicle-mounted antenna among the plurality of vehicles 1a, 1b,. Only the vehicle with the DSRC in-vehicle device facing the direction of the radio wave radiation pattern 4 can communicate with the base station 7.
[0005]
For example, in the example shown in FIG. 11, since the radio wave radiation pattern 3a of the vehicle-mounted antenna of the vehicle 1a equipped with the DSRC vehicle-mounted device faces the direction of the radio wave radiation pattern 4 of the roadside antenna 2, the vehicle 1a equipped with the vehicle-mounted DSRC vehicle can communicate. However, since the radio wave radiation patterns 3b, 3c,... 3n of the vehicle-mounted antennas of the other DSRC vehicle-mounted devices 1b, 1c,. , 1RC,... 1n cannot communicate with each other.
[0006]
[Problems to be solved by the invention]
When a vehicle mounted with a conventional DSRC vehicle-mounted device or a vehicle-mounted antenna constituting the DSRC vehicle-mounted device fixed on a dashboard or the like enters a parking lot or the like and communicates with the roadside antenna 2, the vehicle is parked in the parking lot 7. Depending on the place where the vehicle is to be driven, there is a case where the DSRC vehicle-mounted device or the vehicle-mounted antenna 2 constituting the DSRC vehicle-mounted device does not face the roadside antenna 2 depending on the place where the vehicle is driven.
It is necessary to be able to normally communicate with the roadside antenna or to normally download music or the like regardless of where the car is parked in the parking lot.
[0007]
The present invention has been made in order to solve such a problem, and even if the car is parked at any position in the parking lot or the car is parked in any direction, the roadside antenna and the roadside antenna can be normally operated. It is an object of the present invention to provide a vehicle-mounted device for road-vehicle communication capable of performing communication.
[0008]
[Means for Solving the Problems]
The vehicle-mounted device for road-to-vehicle communication according to the present invention is a vehicle-mounted device for road-to-vehicle communication that is mounted on a vehicle and performs information communication with a base station via a road-side antenna installed at a predetermined location. An in-vehicle antenna for performing information communication, an in-vehicle device main body on which the in-vehicle antenna is mounted, and an in-vehicle device main body rotating mechanism rotatably supporting the in-vehicle device main body.
[0009]
In addition, the in-vehicle device main body rotation mechanism of the in-vehicle device for road-to-vehicle communication according to the present invention includes a first support fixed to a back surface of the in-vehicle device main body, and a first support fixed to a predetermined position of the vehicle. It comprises a second support for rotatably holding the body, wherein the first support can be manually rotated.
[0010]
In addition, the in-vehicle device main body rotation mechanism of the in-vehicle device for road-to-vehicle communication according to the present invention includes a first support fixed to a back surface of the in-vehicle device main body and a predetermined position of the car, and the in-vehicle antenna receives the signal. And a second support having a rotary drive for automatically rotating the first support in a direction in which the level of the received radio wave increases.
[0011]
Further, the vehicle-mounted device for road-to-vehicle communication according to the present invention is a vehicle-mounted device for road-to-vehicle communication, which is mounted on a vehicle and performs information communication with a base station via a road-side antenna installed at a predetermined location. The vehicle includes an in-vehicle antenna for performing information communication with the antenna, an in-vehicle device main body separately arranged from the in-vehicle antenna, and an in-vehicle antenna rotation mechanism rotatably supporting the in-vehicle antenna.
[0012]
The vehicle-mounted antenna rotating mechanism of the vehicle-mounted device for road-to-vehicle communication according to the present invention includes a first support fixed to a back surface of the vehicle-mounted antenna, and a first support fixed to a predetermined position of the vehicle. The first support is rotatably held, and the first support can be manually rotated.
[0013]
The vehicle-mounted antenna rotating mechanism of the vehicle-mounted device for road-to-vehicle communication according to the present invention includes a first support fixed to a back surface of the vehicle-mounted antenna, and a receiving member fixed to a predetermined position of the vehicle and received by the vehicle-mounted antenna. And a second support having a rotary drive for automatically rotating the first support in a direction in which the level of the radio wave increases.
[0014]
Further, the vehicle-mounted device for road-to-vehicle communication according to the present invention further includes voice guidance means for guiding a rotation direction in which the level of a received radio wave received by the vehicle-mounted antenna increases. The vehicle-mounted device for road-to-vehicle communication according to claim 2 or 5, wherein:
[0015]
Further, an on-vehicle device for road-to-vehicle communication according to the present invention includes a monitor device for displaying a level of a received radio wave received by the on-vehicle antenna.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In the drawings, the same reference numerals indicate the same or corresponding components.
Embodiment 1 FIG.
FIG. 1 shows a state in which normal communication with a roadside antenna 2 can be achieved by using a DSRC vehicle-mounted device (vehicle-to-vehicle communication vehicle-mounted device) according to the present invention.
In the figure, 1a, 1b... 1n are vehicles equipped with a DSRC in-vehicle device, 2 is a roadside antenna installed in a predetermined place (for example, a parking lot, etc.), 3a, 3b. , 1b... 1n, a radio wave radiation pattern of each vehicle-mounted antenna constituting the DSRC vehicle-mounted device, 4 is a radio wave radiation pattern of the roadside antenna 2, and 7 is a parking lot.
[0017]
As shown in the figure, in the case of the vehicle 1a equipped with the DSRC vehicle-mounted device, the radio wave radiation pattern 3a of the vehicle-mounted antenna constituting the DSRC vehicle-mounted device 1a is oriented in the direction of the radio wave radiation pattern 4 of the roadside antenna 2, so that the vehicle is mounted with the DSRC vehicle. Even if the device is fixed on the dashboard or the like, normal communication with the roadside antenna 2 is possible.
However, in the case of the vehicles 1b, 1c,... 1n equipped with the DSRC in-vehicle device, the radio wave radiation patterns 3b, 3c, 3d,. 4, the direction of the radio wave radiation patterns 3b, 3c, 3d,... 3n of the vehicle-mounted antenna constituting the vehicle-mounted DSRC device is rotated in order to normally communicate with the roadside antenna 2.
[0018]
FIG. 2 is a perspective view showing a configuration of the DSRC vehicle-mounted device (road-vehicle communication vehicle-mounted device) according to the first embodiment.
In the figure, 8 is a DSRC in-vehicle device main body, 9 is a high-frequency circuit, 10 is an in-vehicle antenna, 11 is a display unit, 12a and 12b are buttons, 13 is an IC card, 14 is a first support having a cylindrical shape, for example, 15 Is a second support having a cylindrical shape, 16 is a contact surface between the first support 14 and the second support 15, and 17 is a hand-held knob.
As shown in the figure, the DSRC in-vehicle apparatus according to the present embodiment includes a DSRC in-vehicle apparatus main body 8, a high-frequency circuit 9, an in-vehicle antenna 10 constituting the DSRC in-vehicle apparatus, a display unit 11, buttons 12a and 12b, and an IC card 13. Have been.
[0019]
The first support 14 is fixed to the back of the DSRC in-vehicle device main body 8, and the second support 15 is fixed to, for example, a dashboard of a car.
The first support 14 is rotatably disposed with respect to the second support 15 via the contact surface 16.
That is, the first support 14 and the second support 15 constitute a vehicle-mounted device main body rotation mechanism that rotatably supports the DSRC vehicle-mounted device main body 8. It is rotatable by a mechanism.
Reference numeral 17 denotes a hand-held knob formed on the side peripheral surface of the first support 14 to facilitate rotation of the DSRC in-vehicle device main body 8.
[0020]
Since the DSRC vehicle-mounted device according to the present embodiment is configured as described above, the vehicle-mounted antenna 10 is manually moved in the direction of the roadside antenna 2 by manually rotating the first support 14 with the hand-held knob 17. Can be rotated.
Since the beam width of the radio wave radiation pattern 3 of the vehicle-mounted antenna 10 constituting the DSRC vehicle-mounted device and the beam width of the radio wave radiation pattern 4 of the road-side antenna 2 are considerably large, the vehicle-mounted antenna 10 constituting the DSRC vehicle-mounted device is roughly directed toward the roadside antenna 2. The communication with the roadside antenna 2 is enabled only by the above.
Therefore, communication with the roadside antenna 2 can be easily performed regardless of the direction in which the vehicle is parked with respect to the roadside antenna 2.
[0021]
Embodiment 2 FIG.
FIG. 3 is a perspective view showing the configuration of a DSRC vehicle-mounted device (road-vehicle communication vehicle-mounted device) according to the second embodiment.
In the figure, 18 is a reception level monitor (monitor), 19 is a monitor screen, and 20 is a cable.
In the in-vehicle DSRC device according to the second embodiment, the received radio wave received is subjected to signal processing by the high frequency circuit 9, sent to the reception level monitor device 18 via the cable 20, and the reception level is displayed on the monitor screen 19. You.
The horizontal axis of the monitor screen 19 indicates the rotation angle of the DSRC in-vehicle device body 8, and the vertical axis indicates the reception level.
By rotating the hand-held knob 17, the reception level displayed on the monitor screen 19 changes, and the hand-held knob 17 can be rotated in a direction to increase the reception level.
[0022]
Therefore, no matter what direction the vehicle is parked with respect to the roadside antenna 2, by rotating the hand-held knob 17 while looking at the reception level displayed on the monitor screen 19, the DSRC can be moved in the direction of the roadside antenna 2. The vehicle-mounted device main body 8, that is, the vehicle-mounted antenna 10 that constitutes the DSRC vehicle-mounted device can be directed, and normal communication with the roadside antenna 2 can be performed.
[0023]
Embodiment 3 FIG.
FIG. 4 is a perspective view illustrating a configuration of a DSRC vehicle-mounted device (road-vehicle communication vehicle-mounted device) according to the third embodiment.
Although the appearance is not much different from the DSRC in-vehicle device according to the first embodiment shown in FIG. 2, the content of the second support 15 is different.
In the present embodiment, the radio wave from the roadside antenna 2 is received by the vehicle-mounted antenna 10 constituting the vehicle-mounted DSRC device, and the vehicle-mounted device 8 of the DSRC is automatically rotated in a direction to increase the reception level. And
[0024]
FIG. 5 is a diagram for describing the internal configuration of the second support 15 of the vehicle-mounted DSRC device according to the present embodiment.
As shown in FIG. 5, the inside of the second support 15 is a signal level recording device 21 that records a received wave level received by the DSRC in-vehicle device main body 8, when the DSRC in-vehicle device main body 8 is slightly rotated. , A signal level comparator 22 for comparing the signal levels before and after rotation, a rotation device control device 23, a rotation device 24, and a support device 14 fixed to the back of the DSRC in-vehicle device body 8 from the rotation device 24. And a support 25 for transmitting the rotation of.
[0025]
FIG. 6 shows an operation flowchart when the rotation device 24 automatically rotates the first support 14 fixed to the back surface of the DSRC in-vehicle device main body 8.
FIG. 6 is a flowchart for explaining the operation of the DSRC in-vehicle device according to the present embodiment, in which the rotating device 24 automatically rotates the first support 14 fixed to the back of the DSRC in-vehicle device main body 8. This is to explain the operation at the time of making it.
As shown in FIG. 6, first, a reception signal R1 from the high frequency circuit 9 constituting the DSRC in-vehicle device main body 8 is recorded in the signal level recording device 21.
Next, the DSRC in-vehicle device main body 8 is slightly rotated, and the received signal R2 from the high-frequency circuit 9 is recorded in the signal level recording device 21.
Thereafter, the reception level comparator 22 compares the magnitudes of the reception signals R1 and R2, and the process is as follows.
That is, if the magnitude of R2−R1 is equal to or smaller than a predetermined small value ε (for example, 0.1), it is determined that the front direction of the DSRC in-vehicle device body 8 is oriented toward the roadside antenna 2 and the DSRC in-vehicle device body 8 Is stopped, and communication with the roadside antenna 2 is started.
[0026]
When the magnitude of R2−R1 is larger than a predetermined small value ε (for example, 0.1) and R2 ≧ R1, R1 = R2 is set, and the DSRC in-vehicle apparatus main body 8 receives the reception signal R2. The DSRC in-vehicle device main body 8 is slightly rotated in the same direction as the case, and the received signal R2 is recorded in the signal level recording device 21.
If R2 <R1, R1 = R2 is set, and the DSRC in-vehicle device main body 8 is slightly rotated in the opposite direction to the case where the above-mentioned received signal R2 is received, and the received signal R2 is signaled. The information is recorded in the level recording device 21.
The magnitudes of R1 and R2 are compared again, and the process is repeated until the magnitude of R2−R1 becomes equal to or smaller than a predetermined small value ε (for example, 0.1).
[0027]
Then, when the size of R2−R1 becomes equal to or smaller than a predetermined small value ε (for example, 0.1), the rotation of the DSRC in-vehicle device main body 8 is stopped and communication with the roadside antenna 2 is started.
By performing such an operation, the DSRC in-vehicle device main body 8, that is, the DSRC in-vehicle device is automatically configured in the direction of the roadside antenna 2 regardless of the direction in which the vehicle is parked with respect to the roadside antenna 2. Of the vehicle-mounted antenna 10, and normal communication with the roadside antenna 2 can be performed.
[0028]
Embodiment 4 FIG.
FIG. 7 is a perspective view showing a configuration of a DSRC in-vehicle device (in-vehicle device for road-to-vehicle communication) according to the fourth embodiment.
In the figure, 26 is a speaker, and 27 is a cable.
In the DSRC in-vehicle device according to the present embodiment, in the flowchart of FIG. 6, the operation of slightly rotating the DSRC in-vehicle device main body 8 in the same direction or the opposite direction is guided by voice, and the DSRC in-vehicle device main body 8 is operated using the hand-held knob 17. Manually.
That is, a voice guidance unit is provided for guiding the rotational direction in which the level of the received radio wave received by the on-vehicle antenna 10 increases.
Therefore, in the present embodiment, the rotating device control device 23 and the rotating device 24 in FIG. 6 are unnecessary.
[0029]
Embodiment 5 FIG.
FIG. 8 is a perspective view showing a configuration of a main part of a DSRC in-vehicle device (in-vehicle device for road-to-vehicle communication) according to a fifth embodiment.
FIG. 9 shows a conventional example in which the vehicle-mounted antenna 10 constituting the vehicle-mounted DSRC device is arranged separately from the vehicle-mounted DSRC device body 8.
In the conventional example shown in FIG. 9, only the in-vehicle antenna 10 is arranged on the dashboard or the like separately from the in-vehicle apparatus main body, and the DSRC in-vehicle apparatus main body 8 is arranged in a place that cannot be seen below the dashboard. It is.
In FIGS. 8 and 9, reference numeral 28 denotes a power supply line connecting the vehicle-mounted antenna 10 and the high-frequency circuit 9 in the DSRC vehicle-mounted device main body 8.
[0030]
As shown in FIG. 8, the vehicle-mounted DSRC device according to the present embodiment is characterized in that only the vehicle-mounted antenna 10 is rotated in the direction of the roadside antenna 2 as compared with the conventional example of FIG.
In FIG. 8, the first support 14, the second support 15, and their contact surfaces 16 are the same as those shown in any of the first to fourth embodiments.
Rotating only the vehicle-mounted antenna 10 in the direction of the road-side antenna 2 in order to perform normal communication with the road-side antenna 2 is the same as rotating the DSRC vehicle-mounted device body 8 in the first to fourth embodiments. Here, the description is omitted.
[0031]
In the above description, a manual knob is provided for manual rotation, but this manual knob may not be particularly provided.
The monitor screen may use a screen of the navigation system or a display unit constituting the DSRC in-vehicle device, and the speaker for informing by sound may use a speaker in the navigation system or a speaker constituting the DSRC in-vehicle device.
Further, the rotating device for automatic rotation may have any configuration such as a combination of a motor and a gear or a cam, or a device using an actuator, a piezoelectric element, or the like.
[0032]
In addition, the present invention can be used for adjusting only by rotating only the DSRC in-vehicle device body or the in-vehicle antenna constituting the DSRC in-vehicle device in a direction optimal for communication when there is a reflection of radio waves from a surrounding structure or the like. good.
In the present embodiment, a parking lot is described as an example of a place where the roadside antenna is installed. However, the present invention is not limited to this, and the present invention is not limited to this. It goes without saying that the present invention can also be applied to the case of communicating or downloading music or the like.
[0033]
【The invention's effect】
A vehicle-mounted device for road-to-vehicle communication according to the present invention is a vehicle-mounted device for road-to-vehicle communication that is mounted on a vehicle and performs information communication with a base station via a road-side antenna installed at a predetermined location. Antenna, an in-vehicle device main body on which the in-vehicle antenna is mounted, and an in-vehicle device main body rotation mechanism rotatably supporting the in-vehicle device main body. In addition, even if the vehicle equipped with the road-to-vehicle communication vehicle-mounted device is parked in any direction, the vehicle-mounted antenna can be directed in the optimum direction, and normal information can be transmitted to the base station via the roadside antenna. Communication can be performed.
[0034]
In addition, the in-vehicle device main body rotation mechanism of the in-vehicle device for road-to-vehicle communication according to the present invention includes a first support fixed to a back surface of the in-vehicle device main body, and a first support fixed to a predetermined position of the vehicle to rotate the first support. It is composed of a second support that can be held as possible, and the first support is configured to be able to be rotated manually, so that the car equipped with the road-to-vehicle communication in-vehicle device is located in which position, and in which direction Even if the vehicle is parked, the on-vehicle antenna can be oriented in the optimal direction, and the on-vehicle device for road-to-vehicle communication that can perform normal information communication with the base station via the roadside antenna has a simple structure and is inexpensive. realizable.
[0035]
In addition, the in-vehicle device body rotation mechanism of the in-vehicle device for road-to-vehicle communication according to the present invention includes a first support fixed to the back of the in-vehicle device body, and a received radio wave fixed to a predetermined position of the vehicle and received by the in-vehicle antenna. And the second support having a rotation drive device that automatically rotates the first support in the direction in which the level increases. No matter which direction the car is parked, the car antenna can be automatically turned to the optimal direction, and high-quality communication can be automatically performed normally with the base station via the roadside antenna. A vehicle-mounted device for road-to-vehicle communication can be realized.
[0036]
The vehicle-mounted device for road-to-vehicle communication according to the present invention is a vehicle-mounted device for road-to-vehicle communication that is mounted on a vehicle and performs information communication with a base station via a road-side antenna installed at a predetermined location. An on-board antenna for performing information communication, an on-vehicle device main body separately disposed from the on-board antenna, and an on-board antenna rotating mechanism rotatably supporting the on-board antenna are provided, so that a location where the roadside antenna is installed is provided. Regardless of where or in which direction the vehicle equipped with the road-to-vehicle communication in-vehicle communication device is parked, only the lightweight in-vehicle antenna is oriented in the optimal direction and the base station can be normally connected via the roadside antenna. A vehicle-mounted device for road-to-vehicle communication capable of performing various types of information communication can be realized.
[0037]
Further, the vehicle-mounted antenna rotating mechanism of the vehicle-mounted device for road-to-vehicle communication according to the present invention includes a first support fixed to the back of the vehicle-mounted antenna and a fixed position in the vehicle, enabling the first support to rotate. It consists of a second support that is held, and the first support is configured to be able to be rotated manually, so where and where in the place where the roadside antenna is installed, A road-to-vehicle communication in-vehicle device that can perform normal information communication with a base station via a roadside antenna only by directing the lightweight in-vehicle antenna in the optimal direction even when a vehicle equipped with the in-vehicle device is parked. It can be realized at low cost with a simple structure.
[0038]
Also, the on-vehicle antenna rotating mechanism of the on-vehicle device for road-to-vehicle communication according to the present invention includes a first support fixed to the back of the on-vehicle antenna, and a level of a received radio wave received by the on-vehicle antenna fixed to a predetermined position of the car. And the second support having a rotation drive device that automatically rotates the first support in the direction in which the roadside antenna is installed, so that where in the place where the roadside antenna is installed, and in which direction Even when the vehicle equipped with the road-to-vehicle communication in-vehicle device is parked, it is possible to automatically direct only the lightweight in-vehicle antenna in the optimum direction, and automatically normalize with the base station via the roadside antenna. A high-quality on-vehicle device for road-to-vehicle communication capable of performing high-quality information communication can be realized at low cost.
[0039]
In addition, the vehicle-mounted device for road-to-vehicle communication according to the present invention further includes voice guidance means for guiding a rotation direction in which the level of a received radio wave received by the vehicle-mounted antenna becomes high. In addition, it is possible to realize a vehicle-mounted device for road-vehicle communication capable of easily turning the vehicle-mounted antenna in an optimal direction by hearing, regardless of which direction the vehicle equipped with the vehicle-mounted device for road-vehicle communication is parked. .
[0040]
In addition, the vehicle-mounted device for road-to-vehicle communication according to the present invention includes the monitor device that displays the level of the received radio wave received by the vehicle-mounted antenna, so that the position where the roadside antenna is installed and the direction in which Even when a vehicle equipped with the on-vehicle vehicle-to-vehicle communication device is parked facing the vehicle, the on-vehicle device for road-to-vehicle communication can be realized in which the on-vehicle antenna can be easily and visually directed in an optimal direction.
[Brief description of the drawings]
FIG. 1 is a diagram showing a state where a vehicle equipped with a DSRC vehicle-mounted device (road-vehicle communication vehicle-mounted device) according to the present invention is parked in a parking lot.
FIG. 2 is a perspective view showing a configuration of a DSRC in-vehicle apparatus (in-vehicle apparatus for road-to-vehicle communication) according to the first embodiment;
FIG. 3 is a perspective view showing a configuration of an on-board DSRC device (on-vehicle device for road-to-vehicle communication) according to a second embodiment;
FIG. 4 is a perspective view showing a configuration of a DSRC in-vehicle device (in-vehicle device for road-to-vehicle communication) according to a third embodiment;
FIG. 5 is a diagram for explaining an internal configuration of a second support of a DSRC vehicle-mounted device (road-vehicle communication vehicle-mounted device) according to a third embodiment;
FIG. 6 is a flowchart for explaining an operation of a DSRC vehicle-mounted device (road-vehicle communication vehicle-mounted device) according to a third embodiment;
FIG. 7 is a perspective view showing a configuration of a DSRC in-vehicle device (in-vehicle device for road-to-vehicle communication) according to a fourth embodiment.
FIG. 8 is a perspective view showing a configuration of a main part of a DSRC in-vehicle apparatus (an in-vehicle apparatus for road-to-vehicle communication) according to a fifth embodiment.
FIG. 9 is a perspective view showing a conventional example in which an in-vehicle antenna constituting the in-vehicle DSRC device is arranged separately from a main body of the in-vehicle DSRC device.
FIG. 10 is a diagram showing a state where a vehicle equipped with a DSRC in-vehicle device and a roadside antenna are performing bidirectional communication.
FIG. 11 is a diagram showing a state in which a plurality of vehicles equipped with a conventional DSRC in-vehicle device are parked in a parking lot 7;
[Explanation of symbols]
1, 1a, 1b,... 1n Vehicle mounted with DSRC on-board device 2 Roadside antenna 3, 3a, 3b,... 3n Radio wave radiation pattern of vehicle-mounted antenna constituting DSRC vehicle-mounted device 4 Radio wave radiation pattern of roadside antenna 5 Communication cable Reference Signs List 6 base station 7 parking lot 8 DSRC in-vehicle device main body 9 high-frequency circuit 10 in-vehicle antenna 11 display unit 12a, 12b button 13 IC card 14 first support 15 second support 16 contact surface 17 hand-held knob 18 reception level monitor ( 19 Monitor screen 20, 27 Cable 21 Signal level recording device 22 Signal level comparator 23 Rotating device control device 24 Rotating device 25 Support member 26 transmitting rotation from the rotating device to first support member Speaker 28 Feeder line

Claims (8)

An in-vehicle device for road-to-vehicle communication, which is mounted on a car and performs information communication with a base station via a roadside antenna installed at a predetermined place,
A vehicle-mounted antenna for performing information communication via the roadside antenna,
An in-vehicle device body on which the in-vehicle antenna is mounted,
A vehicle-mounted device for road-to-vehicle communication, comprising: a vehicle-mounted device body rotating mechanism rotatably supporting the vehicle-mounted device body. The in-vehicle device main body rotation mechanism includes a first support fixed to a back surface of the in-vehicle device main body, and a second support fixed to a predetermined position of a vehicle and rotatably holding the first support. The vehicle-mounted device for road-to-vehicle communication according to claim 1, wherein the first support is configured to be manually rotatable. The in-vehicle device main body rotation mechanism includes a first support fixed to the back of the in-vehicle device main body, and a first support fixed to a predetermined position of a car, and the first in-vehicle antenna is received in a direction in which a level of a received radio wave received by the in-vehicle antenna increases. The on-vehicle device for road-vehicle communication according to claim 1, comprising a second support having a rotation drive device for automatically rotating one support. An in-vehicle device for road-to-vehicle communication, which is mounted on a car and performs information communication with a base station via a roadside antenna installed at a predetermined place,
A vehicle-mounted antenna for performing information communication via the roadside antenna,
An in-vehicle device body separately arranged from the in-vehicle antenna,
A vehicle-mounted device for road-vehicle communication, comprising: a vehicle-mounted antenna rotation mechanism rotatably supporting the vehicle-mounted antenna. The in-vehicle antenna rotating mechanism includes a first support fixed to the back of the in-vehicle antenna, and a second support fixed to a predetermined position of the vehicle and rotatably holding the first support. The vehicle-mounted device for road-vehicle communication according to claim 4, wherein the first support is configured to be manually rotated. The in-vehicle antenna rotating mechanism is a first support fixed to the back of the in-vehicle antenna, fixed to a predetermined position of the car, the first in the direction in which the level of the received radio wave received by the in-vehicle antenna increases. The in-vehicle device for road-vehicle communication according to claim 4, comprising a second support having a rotation drive device for automatically rotating the support. The vehicle-mounted device for road-to-vehicle communication according to claim 2 or 5, further comprising a voice guidance unit for guiding a rotation direction in which a level of a received radio wave received by the vehicle-mounted antenna increases. The vehicle-mounted device for road-to-vehicle communication according to claim 2, further comprising a monitor device that displays a level of a received radio wave received by the vehicle-mounted antenna.

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