JP2010276450A - On-vehicle navigation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide "an on-vehicle navigation device" capable of preventing a harmful effect of the expansion of the region corresponding to the road traffic information transmitted by an FM broadcast station, the harmful effect being, for example, an uncomfortable feeling and misunderstanding to the displayed road traffic information, and a sense of distrust to the reception result of the road traffic information. <P>SOLUTION: The on-vehicle navigation device displays the road traffic information 28a, 28b, 28c on a third region 30 in a condition where a user can recognize that the road traffic information 28a, 28b, 28c is the information displayed in a limited way to the region outside a second region 3 in the neighboring area. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an in-vehicle navigation device, and more particularly to an in-vehicle navigation device suitable for displaying road traffic information.

  Conventionally, in an in-vehicle navigation system, as shown in FIG. 6, road traffic information such as traffic jam information and regulation information provided as Level 3 of VICS (Vehicle Information and Communication System) (registered trademark) is displayed on a map 1 Overlaid on top of it.

  Currently, road traffic information (hereinafter referred to as VICS information) provided by VICS including such VICS Level 3 information is available for each region of the prefecture (in other words, each comprehensive local public entity) (however, Hokkaido is transmitted by FM multiplex broadcasting by FM broadcasting stations belonging to each region in units of five regions divided into five in Hokkaido.

  In addition, the area corresponding to the FM broadcast station, that is, the area corresponding to the VICS information transmitted from the FM broadcast station, in principle, is the boundary between the affiliated area and the adjacent area adjacent to the affiliated area to which the FM broadcast station belongs. Rather than a first region that is approximated as a set of a group of secondary meshes, the second region is expanded to the adjacent region side as a whole by one secondary mesh. . The secondary mesh corresponds to the section of 1 map of 15,000th of the topographic map, the latitude difference is 5 minutes, the longitude difference is 7 minutes 30 seconds, and the length of one side is about 10km. This is the same area. In addition, since the first area completely includes the boundary between the affiliation area and the adjacent area, for example, unless there is a special circumstance where the prefectural boundary coincides with the boundary of the secondary mesh, Only a surplus portion outside the boundary (on the adjacent area side) of the secondary mesh becomes an area extended to the adjacent area side rather than the affiliated area.

  Here, for example, as shown in FIG. 7, when A prefecture and B prefecture adjacent to each other are considered, for FM broadcast stations belonging to A prefecture, that is, FM broadcast stations having A prefecture as the belonging area, FIG. A region 2 composed of a group of secondary meshes M surrounded by a thick broken line is the first region, and a region 3 composed of a group of secondary meshes M surrounded by a thick solid line in FIG. 7 is the second region. It will be an area.

  With respect to such a second area, it was possible to receive VICS information having the same amount of information as that in the affiliation area even in the area outside the affiliation area.

  As described above, the reason why the area corresponding to each FM broadcasting station is limited to the second area is an operational reason for considering the convenience between the affiliated area and the adjacent area to some extent. Is due to.

JP-A-9-311997

  By the way, as part of the improvement of the VICS information providing service, VICS information about major roads such as highways and national roads existing between the affiliated area and the major cities in the neighboring areas is By adding to the VICS information about the area and transmitting it, an operation for enhancing convenience when going back and forth between the affiliation area and the adjacent area is scheduled. This corresponds to expanding the area corresponding to each FM broadcast station than before.

According to such a new operation, for example, as shown in FIG. 8, an FM broadcast station belonging to prefecture A receives VICS information about the second area 3 (see FIG. 8) for this FM broadcast station. Not only that, but also the VICS information about the section 4 outside the second area 3 on the main roads R ₁ and R ₂ extending from the A prefecture to the main cities a and b of the B prefecture adjacent to the A prefecture. Become.

  However, at present, there is a concern that the following adverse effects may be caused by expanding the area corresponding to the FM broadcast station by such a new operation.

That is, as shown in FIG. 9, when the VICS level 3 VICS information transmitted from the FM broadcasting station belonging to A prefecture by the new operation described above is displayed, VICS information is superimposed on map 1 only for some major roads R ₁ and R ₂ , and VICS information is not displayed for other roads. If the display density (information amount) of information is significantly different, there is a possibility that the user may feel uncomfortable. In addition, for roads where VICS information is not displayed, there is a possibility of causing misunderstanding that there is no traffic jam or congestion, and there is a possibility of causing distrust to the reception function of VICS information in the in-vehicle navigation device There is.

  Therefore, the present invention has been made in view of such a point, and corresponds to road traffic information transmitted from an FM broadcast station such as discomfort and misunderstanding about the displayed road traffic information and distrust to the reception result of the road traffic information. Can be prevented from being adversely affected, and the user can properly enjoy and feel the benefits of expanding the area corresponding to the road traffic information transmitted from the FM broadcast station. An object of the present invention is to provide an in-vehicle navigation device capable of performing the above.

  In order to solve the above problems, an in-vehicle navigation device according to the present invention includes a map data storage unit storing map data and a predetermined area based on the map data stored in the map data storage unit. A map display means for displaying a map showing the information on the display section, road traffic information receiving means for receiving road traffic information about the corresponding area corresponding to the FM broadcast station transmitted from the FM broadcast station by FM multiplex broadcasting, Road traffic which displays the road traffic information received by the road traffic information receiving means on the map showing an area including at least a part of the corresponding area as the predetermined area displayed by the map display means. An in-vehicle navigation device comprising an information display means, wherein the corresponding region is a region to which the FM broadcast station belongs. The unit area is expanded to the adjacent area side as a whole rather than the first area that is approximated as a set of a group of unit areas that includes the boundary between the area and the adjacent area adjacent thereto. Formed by the second region and a third region composed of a specific region outside the second region in the adjacent region, and the road traffic information display means for the third region. Control for displaying the road traffic information in a state in which the user can recognize that the road traffic information is road traffic information that is limitedly displayed for an area outside the second area in the adjacent area. It is characterized by having a road traffic information display control means for performing.

  And according to such a structure, by the control of the road traffic information display control means, the road traffic information about the third area is limited to the area outside the second area in the adjacent area. Since the displayed road traffic information can be displayed in a state that the user can recognize, the corresponding areas such as discomfort and misunderstanding about the displayed road traffic information and distrust of the road traffic information reception result are the first. It is possible to prevent adverse effects caused by the expansion to the third area.

  The third area may be a section outside the second area on a main road extending from the affiliation area to a main city in the adjacent area.

  And according to such a structure, the bad effect by the road traffic information provision service being extended to the section outside the 2nd field in the main road which continues from the affiliation area to the main city of an adjacent area can be prevented. .

  Further, the road traffic information display control means, as the control, controls the display mode of the road traffic information for the third area to be different from the display mode of the road traffic information for the second area. May be performed.

  And according to such composition, the road traffic information about the 3rd field is made different from the display mode of the road traffic information about the 3rd field from the display mode of the road traffic information about the 2nd field. Can be displayed in a state in which the user can more easily recognize that the road traffic information is road traffic information that is displayed in a limited manner for an area outside the second area in the adjacent area.

  Furthermore, the road traffic information display control means displays, as the control, information indicating that the road traffic information does not exist for the area outside the second area and outside the third area in the adjacent area. You may make it perform control for doing.

  And according to such a structure, by displaying the information which shows that there is no road traffic information about the area | region outside the 2nd area | region and an area | region outside the 3rd area | region in an adjacent area, about 3rd area | region The road traffic information can be displayed in a state in which the user can more easily recognize that the road traffic information is road traffic information that is displayed in a limited manner for an area outside the second area in the adjacent area.

  ADVANTAGE OF THE INVENTION According to this invention, the badness by the area | region corresponding to the road traffic information transmitted from FM broadcasting station, such as discomfort and misunderstanding with respect to the displayed road traffic information, and the distrust with respect to the reception result of road traffic information, is prevented. As a result, the user can appropriately enjoy and feel the merits of expanding the area.

The hardware block diagram which shows embodiment of the vehicle-mounted navigation apparatus which concerns on this invention Functional block diagram showing an embodiment of an in-vehicle navigation device according to the present invention The schematic diagram which shows an example of the display state of the VICS information peculiar to this embodiment in embodiment of the vehicle-mounted navigation apparatus concerning this invention The schematic diagram which shows an example of the display state of the VICS information peculiar to this embodiment different from FIG. 3 in embodiment of the vehicle-mounted navigation apparatus concerning this invention The flowchart which shows embodiment of the vehicle-mounted navigation apparatus which concerns on this invention Schematic diagram showing the display state of Level 3 VICS information that has been adopted conventionally Explanatory drawing for demonstrating the area | region corresponding to FM broadcasting station in the provision service of conventional VICS information Explanatory drawing for demonstrating the area | region corresponding to FM broadcasting station in the provision service of VICS information currently scheduled Explanatory diagram for explaining current problems

  Hereinafter, an embodiment of an in-vehicle navigation device according to the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the in-vehicle navigation device 5 in this embodiment is roughly divided into a navigation main unit 6, a GPS receiver 7, an autonomous navigation sensor 8, and an input operation unit 10 connected to the navigation main unit 6. , A display 11, a speaker 12, a beacon receiver 14, and an FM multiplex receiver 15 as road traffic information receiving means in the present embodiment.

  The GPS receiver 7 receives GPS information (information on time and orbit) distributed from a GPS satellite (not shown), and outputs the received GPS information to the navigation main unit 6 side.

  The autonomous navigation sensor 8 detects the acceleration of the host vehicle, the vehicle speed, the host vehicle direction, and the like, and outputs the detection result to the navigation main unit 6 side. The autonomous navigation sensor 8 may be a gyro sensor or the like.

  The input operation unit 10 is used for various input operations on the in-vehicle navigation device 5. The input operation unit 10 may be a remote controller, a touch panel of the display 11, a linear encoder, a rotary encoder, or the like.

  The beacon receiver 14 is configured to receive VICS information as road traffic information transmitted mainly by radio wave beacons installed on highways or optical beacons installed mainly on ordinary roads.

  The FM multiplex receiver 15 receives VICS information about an area corresponding to the FM broadcast station (hereinafter referred to as a corresponding area) transmitted by FM multiplex broadcast from the FM broadcast station selected on the in-vehicle navigation device 5 side. It is supposed to be. The corresponding area can be said to be an area corresponding to VICS information transmitted from an FM broadcast station.

  The VICS information is sequentially distributed from the VICS center to the radio wave beacon, the optical beacon and the FM broadcast station at predetermined time intervals, and the distributed VICS information is mounted on the vehicle by the radio wave beacon, the optical beacon or the FM broadcast station. It is transmitted to the navigation device 5 side.

  Next, the navigation main unit 6 will be described in detail. As shown in FIG. 1, the navigation main unit 6 includes a navigation CPU 16, a ROM 17, a RAM 18, and a hard disk drive (HDD) 19 connected to the system bus 13, respectively. Yes.

  Here, the navigation CPU 16 executes various functions of the in-vehicle navigation device 5 such as a map display function, a vehicle position calculation function, a route search function, and a route guidance function.

  The ROM 17 stores an execution program for the navigation CPU 16, and the navigation CPU 16 executes the function of the in-vehicle navigation device 5 by executing the execution program.

  Further, the RAM 18 is used for temporary storage of data such as processing results by the navigation CPU 16.

  Furthermore, the hard disk drive 19 functions as map data storage means, and the hard disk drive 19 stores map data. In the present embodiment, the map data is managed by being hierarchized into a plurality of levels according to the level of detail and the area of the area, and at each level, the map data has a size corresponding to each level. Are managed in mesh units. And in the predetermined level among the levels of a plurality of layers, the map data is managed in units of secondary mesh. In this embodiment, the map data includes identification information (for example, the frequency of an FM broadcast station) that indicates at least one FM broadcast station that can be received in each area corresponding to each secondary mesh. Is described in a state associated with the secondary mesh together with the priority of reception. The map data also includes data such as road data (links, nodes, segments, shape interpolation points, etc.) and background data (points, polylines, polygons, text, etc.).

  Next, the navigation CPU 16 will be described in detail. As shown in FIG. 2, the navigation CPU 16 has a vehicle position calculation unit 20 as one of its functional blocks. The GPS information output from the GPS receiver 7 and the detection result output from the autonomous navigation sensor 8 are input. And the own vehicle position calculation part 20 performs the satellite navigation which calculates an own vehicle position as an absolute coordinate based on the GPS information input from the GPS receiver 7 side. In addition, the vehicle position calculation unit 20 performs autonomous navigation that calculates the vehicle position as a relative position that is a change from the previous positioning position based on the detection result input from the autonomous navigation sensor 8 side. It has become. Furthermore, the vehicle position calculation unit 20 uses the map data stored in the hard disk drive 19 to correct the vehicle position calculated by satellite navigation or autonomous navigation to a corresponding position on the road in the map data. Map matching processing is performed. When the map matching process is properly performed, the own vehicle position calculation unit 20 uses the own vehicle position after the map matching process as a final calculation result.

  As shown in FIG. 2, the navigation CPU 16 has a map drawing unit 21 as a map display means as one of its functional blocks. The map drawing unit 21 generates a map indicating a predetermined area by using map data stored in the hard disk drive 19. Note that the map generated by the map drawing unit 21 may indicate a region around the vehicle position calculated by the vehicle position calculation unit 20 as a predetermined region, or an input operation The area designated by the user may be indicated by map scroll using the unit 10. The map drawing unit 21 displays the generated map on the display 11.

  Furthermore, as shown in FIG. 2, the navigation CPU 16 has a route search unit 22 as one of its functional blocks. The route search unit 22 performs navigation according to the destination setting operation using the input operation unit 10 from the vehicle position calculated by the vehicle position calculation unit 20 based on the map data stored in the hard disk drive 19. Route calculation for searching for a route (for example, a recommended route) to the destination set by the CPU 16 is performed. The route search unit 22 searches for a route for avoiding traffic congestion and congestion in real time based on the VICS information received by the beacon receiver 14 or the FM multiplex receiver 15.

  Furthermore, as shown in FIG. 2, the navigation CPU 16 has a route guidance unit 23 as a route guidance unit as one of its functional blocks, and this route guidance unit 23 is searched by the route search unit 22. Route guidance (in other words, route guidance) for guiding the host vehicle to the destination along the route is performed. In this route guidance, for example, an enlarged view of an intersection is displayed on the display 11, or an image of the route searched for by the route search unit 22 is superimposed on the map displayed on the display 11 by the map drawing unit 21. Alternatively, this is performed by outputting a sound for turning right and left at the intersection via the speaker 12 or the like.

  As shown in FIG. 2, the navigation CPU 16 has a VICS information drawing unit 24 as a road traffic information display means as one of its functional blocks. The VICS information drawing unit 24 is a beacon receiver. 14 or the FM multiplex receiver 15 displays VICS information on the display 11. At this time, the VICS information drawing unit 24 displays VICS information at a level selected by the user by an input operation using the input operation unit 10. Specifically, the VICS information drawing unit 24 displays the VICS information as character information when level 1 is selected, and displays the VICS information using a simple figure when level 2 is selected. When level 3 is selected, the VICS information is superimposed and displayed on the map displayed by the map drawing unit 21 (however, the map includes at least a part of the corresponding area).

  In the present embodiment, the corresponding area is an area formed by the second area and the third area. However, the second area is a group of secondary meshes (a group of secondary meshes including a boundary between the area to which the FM broadcasting station belongs and a neighboring area that is an area adjacent thereto. This is a region that is expanded to the adjacent region side as a whole by one secondary mesh than the first region that is approximated as a set of unit areas) (the same applies hereinafter). The third area refers to a specific area outside the second area in the adjacent area (hereinafter the same).

  In the present embodiment, the second area corresponds to the area 3 shown in FIG. 7, and the first area corresponds to the area 2 shown in FIG. Further, the affiliation area and the adjacent area may be in units of prefectures, and in particular, in Hokkaido, the area may be divided into a plurality of areas in the road.

  Further, the third area may be a section outside the second area on a main road that extends from the affiliation area to a main city in the adjacent area.

  Furthermore, as shown in FIG. 2, the navigation CPU 16 has a VICS information drawing control unit 25 as road traffic information display control means as one of its functional blocks. The VICS information drawing control unit 25, when the display of the level 3 VICS information is selected / instructed by the input operation unit 10, the VICS information drawing unit 24 sends the VICS information about the third area to the VICS information drawing unit 24. Control for displaying in a state that the user can recognize that this VICS information is VICS information that is limitedly displayed for the area outside the second area in the adjacent area (hereinafter referred to as VICS information display control). ).

  The VICS information drawing unit 24 displays the VICS information according to the VICS information display control by the VICS information drawing control unit 25 when displaying the level 3 VICS information.

  The VICS information drawing control unit 25 performs control for making the display mode of the VICS information for the third area different from the display mode of the VICS information for the second area as the VICS information display control. You may do it.

  Here, FIG. 3 shows an example of the display state of the VICS information as a result of the VICS information display control.

  In FIG. 3, the second area in the map 1 displayed by the map drawing unit 21 as the level 3 VICS information received from the FM broadcasting station belonging to the prefecture A, that is, the FM broadcasting station having the prefecture A as the belonging area. 3, three types of arrow marks 27 a, 27 b, and 27 c indicating the traffic volume of the road are superimposed and displayed along the road in the second region 3. One of these three types of arrow marks 27a, 27b, and 27c indicates that the road flow corresponding to the arrow mark 27a is smooth. Also, one of the other two types of arrow marks 27b and 27c, 27b, indicates that the road corresponding to this arrow mark 27b is congested. Further, the remaining one arrow mark 27c indicates that there is a traffic jam on the road corresponding to the arrow mark 27c. These arrow marks 27a, 27b, and 27c are displayed in different display colors. In addition, a line 31 indicating the outer shape of the second region 3 is also displayed on the map 1. The VICS information drawing unit 24 may display other road traffic information such as traffic regulation information in addition to the arrow marks 27a, 27b, and 27c.

In FIG. 3, main road roads R ₁ and R ₂ extending from A prefecture (the affiliation area) as the third area in the map 1 to the main city of B prefecture (the adjacent area) that is adjacent to A prefecture. As VICS information about a section outside the second region (hereinafter referred to as a main road corresponding section) 30, three types of arrow marks 28 a indicating the traffic volume of the road along the main road corresponding section 30. , 28b, 28c are superimposed and displayed. Depending on the scale of the map, not all of the main road corresponding sections 30 may be displayed on the map 1 at the same time. In such a case, the main road corresponding sections 30 are displayed on the map 1 of the main road corresponding sections 30. The arrow marks 28a, 28b, and 28c for the present portion are displayed in a superimposed manner.

  As shown in FIG. 3, the three types of arrow marks 28 a, 28 b, and 28 c are respectively an arrow mark 28 a indicating that the flow of the corresponding road in the main road corresponding section 30 is smooth, and the main road corresponding section 30. An arrow mark 28b indicating that the corresponding road is congested and an arrow mark 28c indicating that a traffic jam has occurred on the corresponding road in the main road corresponding section 30. The arrow marks 28a, 28b, and 28c are displayed in different display colors, and are also displayed in different display colors from the arrow marks 27a, 27b, and 27c in the second area 3. For example, when the arrow mark 27a in the second area 3 is green, the arrow mark 28a indicating the traffic volume (smooth) at the same level is displayed in dark green, and the arrow mark 27b is orange. Displays the arrow mark 28b indicating the traffic (congestion) at the same level in brown, and when the arrow mark 27c is red, the arrow mark 28c indicating the traffic at the same level (congestion) is blackened. It may be displayed in red.

  In addition to the configuration shown in FIG. 3, for example, the VICS information drawing control unit 25 blinks and displays three types of arrow marks 28 a, 28 b, and 28 c in the main road section 30 as the VICS information display control. You may make it perform control for making it do. In this case, the display colors when the arrow marks 28a, 28b, 28c are turned on are the arrow marks 27a, 27b in the second area 3 indicating the same level of traffic as the arrow marks 28a, 28b, 28c. , 27c may be the same or different.

  Further, FIG. 4 shows an example of a display state of VICS information as a result of the VICS information display control different from that shown in FIG.

  In addition to the three types of arrow marks 28a, 28b, and 28c in the display mode shown in FIG. 3, FIG. 4 further shows areas outside the second area 3 and outside the main road corresponding section 30 in the prefecture B (hereinafter referred to as “ Message information 32 indicating that there is no VICS information corresponding to the fourth area. In FIG. 4, the message information 32 is information in which the fourth area is surrounded by an imaginary line (two-dot chain line) and characters “No VICS information” are superimposed on this area.

  In order to realize the VICS information display control by the VICS information drawing control unit 25, the VICS information drawing control unit 25 selects the first VICS information about the target area received by the FM multiplex receiver 15. It is assumed that the VICS information for the third area and the VICS information for the second area are clearly distinguished. As a specific method for that purpose, when VICS information about the target area is distributed from the VICS center, identification information about the secondary mesh that constitutes the second area of the target area (for example, 2 Next mesh coordinate information) and identification information about the third region in the target region (for example, link ID, secondary mesh coordinate information, etc.) may be distributed in a state corresponding to the VICS information. . Then, the VICS information drawing control unit 25 receives the VICS information about the target area received via the FM multiplex receiver 15, the identification information about the secondary mesh constituting the second area, and the third area. Is compared with the data corresponding to the target area in the map data stored in the hard disk drive 19 using the coordinates or the like as a comparison target, and the VICS information about the third area and the second What is necessary is just to distinguish VICS information about a region.

  In addition to the above-described configuration, the navigation CPU 16 may receive the reception signal from among at least one FM broadcast station corresponding to the secondary mesh in the map data to which the vehicle position calculated by the vehicle position calculation unit 20 corresponds. The FM multiplex receiver 15 is controlled so as to receive VICS information from the FM broadcast station with the highest priority. That is, in the present embodiment, the FM broadcast station corresponding to the vehicle position is automatically selected on the in-vehicle navigation device 5 side. If the VICS information is not properly received from the selected FM broadcast station, the navigation CPU 16 selects the currently selected FM broadcast station among the FM broadcast stations corresponding to the secondary mesh in the map data corresponding to the vehicle position. The FM multiplex receiver 15 may be selected for the FM broadcast station having the second highest priority after the FM broadcast station being set.

  Next, an example of the operation of the present embodiment will be described.

  In the present embodiment, first, in step 1 (ST1) of FIG. 5, the vehicle position calculation unit 20 calculates the vehicle position.

  Next, in step 2 (ST2), the map drawing unit 21 generates a map showing a predetermined area around the vehicle position calculated in step 1 (ST1) (hereinafter referred to as the vehicle position surrounding map). The generated map around the vehicle position is displayed on the display 11.

  Next, in step 3 (ST3), the navigation CPU 16 determines whether or not there is an instruction to display the VICS information from the input operation unit 10, and if there is such an instruction, the process proceeds to step 4 (ST4). If not, step 3 (ST3) is repeated.

  Next, in step 4 (ST4), the navigation CPU 16 extracts identification information of FM broadcast stations of a plurality of stations corresponding to the secondary mesh in the map data corresponding to the own vehicle position calculated in step 1 (ST1). The FM multiplex receiver 15 selects the FM broadcast station corresponding to the identification information having the highest reception priority among the extracted identification information. It should be noted that at least a part of the corresponding area of the FM broadcast station selected in step 4 (ST4) is included in the area shown in the vehicle position vicinity map.

  Next, in step 5 (ST5), the FM multiplex receiver 15 receives VICS information for the corresponding area corresponding to the FM broadcast station transmitted from the selected FM broadcast station by FM multiplex broadcast.

  Next, in step 6 (ST6), the VICS information drawing control unit 25 determines whether or not the VICS information instructed to be displayed in step 3 (ST3) is level 3, and if it is level 3, The process proceeds to 7 (ST7), and if it is not level 3, the process proceeds to step 9 (ST9).

  Next, in step 7 (ST7), the VICS information drawing control unit 25 performs the VICS information display control for the VICS information drawing unit 24, and then proceeds to step 8 (ST8).

  Next, in step 8 (ST8), the VICS information drawing unit 24 displays the VICS information for the corresponding area in accordance with the VICS information display control in step 7 (ST7), and the process ends.

  On the other hand, in step 9 (ST9), the VICS information drawing unit 24 displays the VICS information of the level (level other than level 3) instructed in step 3 (ST3) and ends the process.

  As described above, according to the present embodiment, under the control of the VICS information drawing control unit 25, the VICS information about the third area is converted into the area outside the second area in the adjacent area. Can be displayed in a state where the user can recognize that the VICS information is limitedly displayed, the corresponding areas such as discomfort and misunderstanding with respect to the displayed VICS information and distrust with respect to the reception result of the VICS information are displayed. It is possible to prevent adverse effects caused by the expansion to the third region.

  In addition, this invention is not limited to such a structure, A various change is possible as needed.

  For example, the present invention can be effectively applied to a road traffic information distribution service using RDS / TMC (Radio Data System / Traffic Message Channel).

5 Car navigation device 11 Display 15 FM multiple receiver 19 Hard disk drive 21 Map drawing unit 24 VICS information drawing unit 25 VICS information drawing control unit

Claims (4)

Map data storage means for storing map data;
Based on the map data stored in the map data storage means, a map display means for displaying a map indicating a predetermined area on the display unit;
Road traffic information receiving means for receiving road traffic information about a corresponding area corresponding to the FM broadcast station transmitted from the FM broadcast station by FM multiplex broadcasting;
A road that superimposes and displays the road traffic information received by the road traffic information receiving means on the map showing an area including at least a part of the corresponding area as the predetermined area displayed by the map display means. A vehicle-mounted navigation device comprising traffic information display means,
The corresponding area is more than a first area obtained by approximating the affiliation area to which the FM broadcast station belongs as a set of a group of unit areas including a boundary between the affiliation area and an adjacent area adjacent thereto. Formed by a second region that is entirely expanded toward the adjacent region by the unit region for one unit, and a third region composed of a specific region outside the second region in the adjacent region,
For the road traffic information display means, the road traffic information for the third area is displayed, and the road traffic information is displayed in a limited manner for areas outside the second area in the adjacent area. A vehicle-mounted navigation device comprising road traffic information display control means for performing control for displaying the information in a state where the user can recognize it. The in-vehicle navigation device according to claim 1, wherein the third area includes a section outside the second area on a main road extending from the affiliation area to a main city in the adjacent area. The road traffic information display control means performs control for making the display mode of the road traffic information for the third area different from the display mode of the road traffic information for the second area as the control. The in-vehicle navigation device according to claim 1 or claim 2, wherein The road traffic information display control means displays, as the control, information indicating that the road traffic information does not exist for an area outside the second area and outside the third area in the adjacent area. The vehicle-mounted navigation device according to any one of claims 1 to 3, wherein control is performed.

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