JP3382377B2 - Car navigation system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention can quickly provide a driver with map information such as a tourist spot, an accommodation place, a guide route, a destination, etc., which is not included in the map display area of the screen but exists near the vehicle position. The present invention relates to a vehicle-mounted navigation device.

[0002]

2. Description of the Related Art While a vehicle is traveling, a vehicle position and a vehicle direction are detected, a certain range of map data including the vehicle position is read out from a predetermined map data storage medium, and a map image including the vehicle position is displayed together with a vehicle position mark. There is a vehicle-mounted navigation device that is drawn and displayed on the screen, and it is possible to confirm the current position on a map and the whereabouts of tourist spots and lodging places.

Some on-vehicle navigation devices have a route guidance function. When a driver inputs a desired destination, map data is used to optimally connect the current position, which is the starting point, to the destination. The guide route is automatically searched and stored. While the vehicle is traveling, the guidance route data around the vehicle position is read out, and the guidance route is drawn on the map image so that the driver can easily reach a desired destination if the driver follows the guidance route.

By the way, the in-vehicle navigation device is
Since it takes time to read map data from an external storage medium such as a CD-ROM, a wide range of map data including the vehicle position is collectively read to the internal memory (RAM), and the read map data is used. For example, by drawing a wide range map image in a video RAM having a storage area for 9 screens and reading out a range of 1 screen including the vehicle position from the video RAM and displaying the screen, the map image can be smoothly changed. I am doing it.

[0005]

However, as shown in FIG.
Only the video RA is displayed on the screen as shown in
Since there is only one screen range including the vehicle position in the map image drawn in M, even if there is a hotel that the driver desires to stay near the current position, it must be within the map display range on the screen. The driver may be unaware of the existence of the hotel, may travel in a different direction from the hotel, and may take time to find the hotel.

Similarly, when the route guidance is displayed, the vehicle deviates from the guidance route, detours, and then returns to the guidance route.
When you go to the destination by a route different from the guide route,
Even if there is a guide route or destination near the current position, if the driver does not notice the existence of the guide route or destination if they are not within the map display range on the screen, they will drive in a direction different from the guide route or destination. It sometimes took time to reach the destination.

Therefore, an object of the present invention is to provide a vehicle-mounted navigation device capable of promptly providing a driver with map information which is not included in the map display area of the screen but exists near the vehicle position. is there.

[0008]

[0009]

In order to solve the above problems, the invention according to claim 1 is directed to a map data storage medium storing map data, a vehicle position detecting means for detecting a vehicle position, and a map image screen. Display means for displaying and map data in a range wider than the screen display range are read from the map data storage medium and stored in a temporary storage memory, and a map image around the vehicle position is used by using the map data stored in the temporary storage memory. In a vehicle-mounted navigation device equipped with a map display processing unit that displays a map of the vehicle position mark on the display unit and compares the map data stored in the temporary storage memory with the map display range on the screen. The extraction means for extracting specific map information that exists near the vehicle position but is not within the map display range on the screen and the map information extracted by the extraction means Coordinate conversion means for performing coordinate conversion on the map image within the display range, and virtual map information drawing means for drawing the virtual map information at the coordinate-converted position on the map image for the map information extracted by the extraction means. , When the execution key is operated while the cursor is moved relative to the map image integrated with the virtual map information according to the operation of the cursor key, and the cursor matches the certain virtual map information, the map data is used. Map search processing means for drawing a map image around the original map information corresponding to the certain virtual map information and displaying it on the screen of the display means is provided.

In order to solve the above-mentioned problems, a second aspect of the present invention is provided.
According to the invention described in claim 1, in the vehicle-mounted navigation device according to claim 1, a guide route storing means for storing guide route data connecting the departure place and the destination is provided, and the guide route or the purpose is included in the specific map information extracted by the extracting means. It is characterized by including the ground.

In order to solve the above-mentioned problems, a third aspect of the present invention is provided.
The invention described is a map data storage medium that stores map data including information data associated with specific map information, a vehicle position detection unit that detects a vehicle position, and a display unit that displays a map image on a screen. The map data in a range wider than the screen display range is read out from the map data storage medium and stored in the temporary storage memory, and the map data around the vehicle position is drawn using the map data stored in the temporary storage memory. In a vehicle-mounted navigation device equipped with map display processing means for displaying marks on the display means, the map data stored in the temporary storage memory is compared with the map display range on the screen and exists near the vehicle position. The extraction means for extracting specific map information that is not within the map display range on the screen and the map information extracted by the extraction means A coordinate transformation means for coordinate transformation on the map image in the display range, per the map information extracted by the extraction means, respond to該地view information on the position after the coordinate transformation in the map image
And the virtual symbol drawing means to draw over a virtual symbol Flip was, the virtual cursor in accordance with the operation of the cursor key symbol
When the execution key is operated with the cursor moving relative to the map image integrated with the cursor and the cursor is aligned with a certain virtual symbol , the map data stored in the temporary storage memory is used to display that virtual symbol . Information search processing means for searching corresponding information data and displaying the information on the screen is provided.

[0012]

[0013]

In the vehicle-mounted navigation device according to claim 1, the map data stored in the temporary storage memory is compared with the map display range on the screen, and the map data exists near the vehicle position, but is not within the map display range on the screen. Specific map information is extracted, and the extracted map information is subjected to coordinate conversion near the original position on the map image within the screen display range, and virtual map information is superimposed and drawn at the position after the coordinate conversion on the map image. ,
When the cursor key is operated, the cursor is moved relative to the map image integrated with the virtual map information, and when the execution key is operated while the cursor matches a certain virtual map information, the map data is used. Then, a map image around the original map information corresponding to the certain virtual map information is drawn and displayed on the screen of the display means. As a result, even map information that does not fall within the map display range of the screen is displayed as virtual map information on the screen, so that the driver can know its existence and the cursor can be placed on the desired virtual chizu information. By operating the execution key after the combination, the map image around the original map information corresponding to the virtual map information can be viewed, so that the location of the desired map information can be easily confirmed on the map. Further, since the drawing process of the virtual map information is performed based on a part of the map data stored in the temporary storage memory, that is, the map data stored in the large-capacity map data storage medium, high speed processing is possible. is there.

[0014] Claim 2 in-vehicle navigation device described, since the extracted as well specific map information guidance route or the destination is not in the map display range of the screen, induced to the driver the route or the destination It is possible to notify the existence of the vehicle, to recognize the approximate direction thereof, and to easily confirm the location of the guide route or the destination on the map.

In the vehicle-mounted navigation device according to the third aspect of the present invention, the map data stored in the temporary storage memory is compared with the map display range on the screen, and the map data exists near the vehicle position, but is not within the map display range on the screen. Specific map information is extracted, and the extracted map information is subjected to coordinate conversion on the map image within the screen display range and a virtual symbol corresponding to the map information is drawn at the position after the coordinate conversion on the map image . , virtual thin the cursor when the cursor key is operated
When the execution key is operated while the cursor moves to a virtual symbol integrated with the map image and the cursor is aligned with a virtual symbol , the map data stored in the temporary storage memory is used to display that virtual symbol . The corresponding information data is searched for and displayed on the display means. As a result, even map information that does not fall within the map display range on the screen is displayed as a virtual symbol on the screen, so that the driver can know its existence and the desired virtual sync
If you move the cursor to the button and operate the execution key,
Since the information data corresponding to the virtual symbol can be viewed, detailed explanation can be easily known without searching the map for the desired desired map information. Further, since the virtual symbol drawing and the information data retrieval processing are performed based on a part of the map data stored in the temporary storage memory, that is, the map data stored in the large-capacity map data storage medium. High-speed processing is possible.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a vehicle-mounted navigation device according to an embodiment of the present invention.

Reference numeral 10 denotes a CD-ROM as an external storage medium (map data storage medium), which is a map including background data, character data, symbol data, road data, information data that describes accommodation sites, tourist sites, etc. in detail. It stores data. The map data is divided into a longitude width and a latitude width for one screen. Further, the information data is stored as ancillary data for particularly important ones of the symbol data. 11 is a GPS receiver for detecting the vehicle position and vehicle direction by satellite navigation, 12 is a cursor key consisting of up, down, left and right keys, map search /
An operation panel including an execution key for executing information search, a navigation key for ending the map search / information search and returning to the display state of the map image with the vehicle position mark, 13 is a map image, an information image It is a display device that displays such as.

Reference numeral 20 denotes a navigation controller composed of a microcomputer system, which is a CD-R.
A map image including a vehicle position or cursor coordinates is drawn using the map data read from the OM 10, and is displayed on the display device 13 together with the vehicle position mark or the cursor mark, or information corresponding to the symbol selected by the driver. The data is displayed on the display device 13.

Reference numeral 21 is a temporary storage memory (RAM) for temporarily storing the map data read from the CD-ROM 10, and 22 is a map including the vehicle position or the cursor coordinates from the CD-ROM 10. For example, nine pieces of map data including a total of eight maps surrounding the map are read out to the temporary storage memory 21, and a map image in a wide range for nine screens including a vehicle position or cursor coordinates is read using the read map data. (Including background, letters, symbols)
Is a map image drawing unit that draws a thick guide route at a corresponding place on the map image using the guide route data stored in the guide route storage unit 29 described later, a departure point symbol, a destination symbol. Also draws.

A first video R 22 has a storage area for 9 screens and stores the map image drawn by the map image drawing section 22.
AM and 23 are read-out units for receiving a read-out control of the map image drawing unit 22 and reading out a map image in the range of one screen centered on the vehicle position or the cursor coordinates from the first video RAM 22, and 24 is a memory for one screen. Map area read out by the reading section 23 or peripheral information described later.
The second video RAM 25 for storing the information image drawn by the information drawing unit, the second video RAM 25 under the mark drawing control of the map image drawing unit 22.
A mark drawing unit that draws a vehicle position mark with the vehicle direction facing the center of the
Reference numeral 27 is a video conversion unit for reading the image drawn in the second video RAM 25, converting it into a predetermined video signal, outputting it to the display device 13, and displaying it on the screen.

Reference numeral 28 is a cursor coordinate calculation unit for calculating cursor coordinates (longitude, latitude) according to the operation of the cursor keys on the operation panel 12, 29 is a guide route storage unit, and an optimum route search unit (not shown) is the CD-ROM 10 Using the road data in the map data of the above, the optimum route connecting the starting point and the destination input by the driver is searched by simulation calculation such as Dijkstra method, horizontal search method, etc., and the node sequence that constitutes the searched route is derived. It is stored as route data. The first data of the guide route data is the departure point data, and the last data is the destination data.

Reference numeral 30 denotes a peripheral information extraction / coordinate conversion unit,
Of the symbols in the map data read out to the temporary storage memory 21, those that are outside the map display range of the screen determined by the current vehicle position are extracted, and the original symbol is displayed within the map display range of the screen. When the coordinate conversion is performed near the position of or the guide route data stored in the guide route storage unit 29 exists only outside the map display range of the screen determined by the current vehicle position,
The portion closest to the vehicle position is extracted from the guide route data, and the coordinates are converted to near the position of the original partial guide route within the map display range of the screen, or the departure point or the purpose stored in the guide route storage unit 29. A part of the ground that exists outside the map display range on the screen determined by the current vehicle position is extracted, and the coordinates are converted to a position near the original starting point or destination within the map display range on the screen. Reference numeral 31 denotes a peripheral information storage unit that stores the coordinates before and after conversion for each of the symbols extracted by the peripheral information extraction / coordinate conversion unit 30, the partial guidance route, and the map information of the starting point or the destination,
Reference numeral 32 denotes a collating unit that collates the cursor coordinates at the time when the execution key is operated with the coordinates before and after the conversion of each map information stored in the peripheral information storage unit 31 and displays the map information that matches the converted coordinates. At a certain time, the corresponding coordinates before conversion are set in the cursor coordinate calculation unit 28. Also, when there is a symbol whose cursor coordinates at the time the execution key is operated match the coordinates before conversion, and has attached information data,
The symbol data is output to the peripheral information / information image drawing unit described later.

Reference numeral 33 denotes a peripheral information / information image drawing unit, which normally stores a map image of the second video RAM 25 for each of the symbols, the partial guide route, and the map information of the departure place and the destination stored in the peripheral information storage unit 31. A symbol whose virtual coordinate symbol, virtual partial guidance route, virtual departure point symbol, and virtual destination symbol are drawn at the position after coordinate conversion above, and the cursor coordinates at the time the execution key is operated match the coordinates before conversion. Therefore, when the symbol is input from the collation unit 32, the information data attached to the symbol is read from the temporary storage memory 21, and the second video RAM 2
Draw to 5.

Next, the operation of the above-described embodiment will be described with reference to FIGS.
Will be described with reference to. 2 is an explanatory diagram of a map image drawn by the map image drawing unit 22, FIGS. 3 to 8 are flow charts showing the operation of the navigation controller 20, and FIGS. 9 and 10 are explanatory diagrams showing screen display examples. The guide route storage unit 2
It is assumed that the guide route data 9 is stored.

Display processing of map image with own vehicle position mark When the power is turned on, the GPS receiver 11 starts detecting the vehicle position and the vehicle direction, and the navigation controller 20 inputs these data (step 101 in FIG. 3), The map image drawing unit 22 reads out from the CD-ROM 10 the map data of one map including the vehicle position P ₀ and the eight maps M1 to M9 surrounding this to the temporary storage memory 21 (step 102).
The first video RAM 23 using the read map data
Draw a map image for 9 screens. At this time, the symbol data is also used to draw a symbol symbol indicating a lodging place, a tourist spot, or the like. Further, the guide route, the departure point symbol, and the destination symbol are drawn using the guide route data, and the reading unit 24 reads out the range for one screen centered on P ₀ (see the solid line B in FIG. 2). The second video RAM 25 is rendered (steps 103 and 104). Then, the mark drawing unit 2
6, the vehicle position mark is drawn at a position corresponding to P ₀ (step 105).

Next, the peripheral information extraction / coordinate conversion unit 30 extracts the symbols existing outside the screen display range near the vehicle position from the map data in the temporary storage memory 21, and determines the vehicle position P ₀ and the extracted symbol position. The coordinates are converted to the intersection (P ₁ for the hotel and P ₂ for the hot spring in FIG. 2) between the straight line connecting the lines and the fixed frame C in the map display range on the screen, and the coordinates before and after the conversion are associated with the symbol and the peripheral information storage unit 31 (steps 106 and 107), and the guide route data is the most vehicle position P ₀ on condition that the guide route is drawn in the first video RAM 23 but not in the second video RAM 25.
Is extracted, and the coordinates are converted to the intersection of the straight line connecting the vehicle position P ₀ and the extracted partial guidance route and the fixed frame C in the map display range of the screen (P ₃ for Q in FIG. 2) and its vicinity. , The coordinates before and after the conversion are stored in the peripheral information storage unit 31 in association with the partial guidance route (steps 202 to 2 in FIG. 4).
05) Further, from the guide route data, the starting point and the destination existing outside the screen display range (outside the solid line B in M1 to M9 in FIG. 2) near the vehicle position are extracted, and extracted as the vehicle position P _0. The coordinates are converted to the intersection (P ₄ for the destination in FIG. 2) between the straight line connecting the starting point and the destination and the fixed frame C in the map display range on the screen, and the points before and after the conversion are associated with the starting point and the destination. The coordinates are stored in the peripheral information storage unit 31 (steps 301 and 302 in FIG. 5).

On the other hand, the peripheral information / information image drawing unit 33 refers to the peripheral information storage unit 31, and extracts the symbols, partial guidance routes, and the symbols extracted by the peripheral information extraction / coordinate conversion unit 30.
A virtual symbol symbol, a virtual partial guidance route, a virtual starting point symbol or a virtual destination symbol is drawn at each position after the coordinate conversion in the second video RAM 25 for the starting point or the destination (steps 201 and 206 in FIG. 4, FIG. 5 step 303).

The image in the second video RAM 25 is read out and converted into a video signal by the video converter 27, and is output to the display device 13 and displayed on the screen (step 304). As a result, as shown in FIG. 9 (1), a symbol existing near the vehicle position but not in the display range of the screen,
Virtual map information is displayed near the original position within the display range of the screen for the map information of the guide route, the departure place, and the destination, so the driver can check the existence of the map information outside the display range of the screen and the vehicle position. It is possible to know the direction in which the user sees the vehicle, and it is possible to quickly drive to the desired place or route if it is the desired place or route.

After that, the navigation controller 1
0 inputs a new vehicle position and vehicle direction from the GPS receiver 11, and the map image drawing unit 12 checks whether or not the vehicle position has changed, and when it changes, one screen centered on the new vehicle position When the display range of 3 does not extend from the map image currently drawn in the first video RAM 23, the process returns to step 104 of FIG. 3 and the same processing is repeated. Young
Since the vehicle has traveled in the direction of the arrow in the two-dot chain line frame A in FIG. 2 in the direction of the arrow, the display range for one screen centered on the new vehicle position is out of the map image currently drawn in the first video RAM 23. In this case, the process proceeds to step 102 of FIG. 3, the map data of nine maps M4 to M12 is read from the CD-ROM 10 to the temporary storage memory 21, and the map image in the first video RAM 23 is rewritten (step 1
03), the processing after step 104 is performed.

Although the map image scrolls as the vehicle position changes, in steps 107, 204 and 302, the virtual map information is re-coordinated on the two-dot chain line frame C in FIG. 2 within the map display range of the screen. Since the displayed information is displayed, the direction in which the map information existing near the vehicle position and outside the screen display range does not become unknown.

Map Retrieval Processing When the driver wants to confirm the actual location on the map of the map information virtually displayed on the screen, he operates the cursor key to enter the map scroll mode (step 305 in FIG. 5). , Step 401 in FIG. 6). At this time, first
A cursor mark appears in the center of the screen instead of the own vehicle position mark (steps 402 to 406). When the operation of the cursor key is continued, the cursor coordinate calculation unit 28 continuously changes the cursor coordinates, and the reading unit 24 receives the reading control of the map image drawing unit 22 and the reading unit 24 centers the cursor coordinates from the first video RAM 23. The range for the screen is read out, drawn on the second video RAM 25, the mark drawing section 26 redraws the cursor mark at the center, and the peripheral information / information image drawing section 33 refers to the peripheral information storage section 31 to display the peripheral information. Regarding the symbol, the partial guidance route, the departure place or the destination previously extracted by the extraction / coordinate conversion unit 30, the second
The image conversion unit 27 redraws the virtual symbol symbol, the virtual partial guidance route, the virtual departure point symbol, or the virtual destination symbol at the position where the peripheral information extraction / coordinate conversion unit 30 finally converted the coordinates on the map image of the video RAM 25. Is displayed on the screen (steps 501 to 503 in FIG. 7 and steps 403 to 406 in FIG. 6 are repeated). As a result, the map image on the screen scrolls together with the virtual map information in response to the cursor operation, and the cursor moves relatively to the map image.

When the driver wants to see the location of the hotel on the actual map, he presses the execution key when the cursor is over the virtual hotel symbol (see FIG. 9 (2)). Then, the collation unit 32 refers to the peripheral information storage unit 31 to collate the cursor coordinates with the coordinates before and after the conversion of the map information, and when there is the map information matching the coordinates after the conversion, the position before the conversion is read, Change the cursor coordinates (step 6 in FIG. 8)
01-603), the reading unit 24 reads a range for one screen centered on the changed cursor coordinates from the first video RAM 23 (step 403). As a result, a map image centering on the hotel symbol is displayed on the screen, so that the driver can easily confirm the actual location of the hotel on the map and drive to the hotel (Fig. 9 (3 )reference). By pressing the navigation key, it is possible to return to the original map image display state with the vehicle position mark (Fig. 8).
Step 604, step 101 in FIG. 3).

When the execute key is pressed with the cursor aligned with the virtual partial guide route, the screen shown in FIG.
As shown in (1), a map image centering on the original guide route corresponding to the virtual partial guide route is displayed, and when the execution key is pressed with the cursor positioned at the virtual destination symbol, the screen is displayed on the screen. As shown in 10 (2), a map image centering on the original destination is displayed.

When the original map information corresponding to the virtual map information such as the virtual sign symbol, the virtual partial guide route, the virtual destination symbol, etc. is contained in the frame A of FIG. 2, the original map information corresponding to the virtual map information is displayed. Since it is not necessary to read new map data from the CD-ROM 10 and redraw the map image in the first video RAM 23 in order to display the map image for one screen centered on the map information, the driver does not need to press the execution key. After pressing
It is possible to immediately see the map image including the desired map information.

When the cursor coordinates exceed the frame A in FIG. 2 during the cursor operation, or when the execution key is pressed after the cursor is placed on the virtual map information corresponding to the map information outside the frame A. The map image drawing unit 21 newly reads out the map data including the cursor coordinates and the map data for the nine maps surrounding the map from the CD-ROM 10, and the first video R
Redraw the map image in AM23 (step 50 in FIG. 7).
3-505).

Information Retrieval Process If you want to know the detailed explanation of the hotel, press the execute key while the cursor is over the hotel symbol (see FIG. 9 (3)). Then, the collating unit 32 collates the cursor coordinates with the coordinates before and after the conversion of the map information by referring to the peripheral information storage unit 31, and the coordinates before the conversion match.
When there is a symbol to which the information data is attached, the symbol data is output to the peripheral information / information image drawing unit 33, and the peripheral information / information image drawing unit 33 outputs the information data corresponding to the symbol data from the temporary storage memory 21. The image is searched and read, an information image is drawn on the second video RAM 25 (steps 605 and 606 in FIG. 8), and the video conversion unit 27 displays it on the screen (step 607).

As a result, a detailed explanation of the hotel is displayed on the screen as shown in FIG. 10 (3), so that the driver can immediately determine whether or not the desired condition is met. By pressing the navigation key, it is possible to return to the original map image display state with the vehicle position mark (step 608 in FIG. 8, step 101 in FIG. 3).

When the information data is attached to the hot spring, if the execution key is pressed while the cursor is over the hot spring symbol, a detailed explanation of the properties and effects of the hot spring can be seen.

When the execution key is pressed while the cursor is over the virtual map information, the collating unit 32 attaches the information to the original map information of the virtual map information whose coordinates match the cursor coordinates. If so, the original map information is output to the peripheral information / information image drawing unit 33, and the peripheral information / information image drawing unit 33 is output.
The information data corresponding to the map information may be read from the temporary storage memory 21 and the information image may be drawn in the second video RAM 25.
In this way, the detailed explanation can be immediately viewed by simply pressing the execution key after aligning the cursor with the virtual map information.

As described above, the temporary storage memory 21 temporarily stores map data in a range wider than the screen display range. This map data is stored in a large-capacity map data storage medium. Since it is a part of the data, the virtual map information drawing process and the retrieval of the information data included in the map data are performed based on the map data stored in the temporary storage memory without accessing the map data storage medium. It can be done at high speed.

If the original map information described above is located at the boundary (edge) of the temporary storage memory, the undisplayable portion may be processed.

[0043]

[0044]

As is apparent from the above description, the claims
In the invention described in 1, the map data stored in the temporary storage memory is compared with the map display range on the screen to extract specific map information existing near the vehicle position but not within the map display range on the screen, With respect to the extracted map information, the coordinate conversion is performed near the original position on the map image within the screen display range, and the virtual map information is drawn at the position after the coordinate conversion on the map image, and the cursor key is operated. When the execution key is operated while the cursor is moved relative to the map image integrated with the virtual map information and the cursor matches the certain virtual map information, the certain virtual map information is used by using the map data. Original map information corresponding to is drawn and displayed on the screen of the display means, so even if the map information does not fall within the map display range of the screen, virtual map information is displayed on the screen. Since it is displayed, the driver can know its existence, and if the execution key is operated after placing the cursor on the desired virtual intelligence information, the area around the original map information corresponding to the virtual map information can be displayed. Since the map image can be viewed promptly, it is possible to provide the vehicle-mounted navigation device that can easily confirm the location of the desired map information on the map.

Further, in the invention according to claim 2 , since the guide route or the destination not included in the map display range on the screen is also extracted as the specific map information, the driver is informed of the guide route or the destination. It is possible to provide a vehicle-mounted navigation device capable of notifying the presence, recognizing the approximate direction thereof, and further easily confirming the location of a guide route or a destination on a map.

Further, in the vehicle-mounted navigation device according to the third aspect, the map data stored in the temporary storage memory is compared with the map display range on the screen, and the map data exists near the vehicle position, but falls within the map display range on the screen. and extract specific map information is not, per extracted map information, the on position after the coordinate transformation in the map image with a coordinate conversion of substantially the same direction position as the original position on the map image in the screen display range
Draw a virtual symbol according to the map information, and when the cursor key is operated, move the cursor relative to the map image integrated with the virtual symbol and execute with the cursor aligned with a certain virtual symbol When a key is operated,
Since the information data corresponding to the certain virtual symbol is searched using the map data stored in the temporary storage memory and is displayed on the screen of the display means, the map information that does not fall within the map display range of the screen is displayed. Even if there is, it is displayed as a virtual symbol on the screen, and the driver can know its existence. Moreover, if you move the cursor to the desired virtual symbol and then operate the execute key, the virtual
Since the information data corresponding to the symbol can be viewed promptly, it is possible to provide the vehicle-mounted navigation device that can easily know the detailed explanation without searching for the original desired map information on the map.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration of a vehicle-mounted navigation device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a map image drawn by a map image drawing unit.

FIG. 3 is a flowchart showing the operation of the navigation controller.

FIG. 4 is a flowchart showing the operation of the navigation controller.

FIG. 5 is a flowchart showing the operation of the navigation controller.

FIG. 6 is a flowchart showing the operation of the navigation controller.

FIG. 7 is a flowchart showing the operation of the navigation controller.

FIG. 8 is a flowchart showing the operation of the navigation controller.

FIG. 9 is an explanatory diagram illustrating a screen display example.

FIG. 10 is an explanatory diagram showing a screen display example.

FIG. 11 is an explanatory diagram of a problem of the conventional vehicle-mounted navigation device.

[Explanation of symbols]

10 CD-ROM (Map data storage medium) 11 GPS receiver 12 Operation panel 13 Display device 20 Navigation controller 21 Temporary storage memory 22 Map image drawing section 23 First Video RAM 24 Read-out section 25 Second video RAM 26 Mark drawing part 27 Video converter 28 Cursor coordinate calculator 29 Guided route storage 30 Peripheral information extraction / coordinate conversion unit 31 Peripheral information storage 32 Collating unit 33 Peripheral information / information image drawing section

Claims (3)

(57) [Claims] 1. A map data storage medium storing map data, a vehicle position detecting means for detecting a vehicle position, a display means for displaying a map image on a screen, and a range wider than the screen display range from the map data storage medium. The map data is read out and stored in a temporary storage memory, a map image around the vehicle position is drawn using the map data stored in the temporary storage memory, and the vehicle position mark is superimposed and displayed on the display means as a map display. In a vehicle-mounted navigation device equipped with a processing means, the map data stored in the temporary storage memory is compared with the map display range on the screen, and a specific vehicle exists near the vehicle position but is not within the map display range on the screen. An extracting means for extracting the map information; a coordinate converting means for converting the map information extracted by the extracting means onto a map image within the screen display range; A virtual map information drawing means for drawing the virtual map information on the position after coordinate conversion on the map image for the map information extracted in the step, and a map image in which the cursor is integrated with the virtual map information according to the operation of the cursor key. When the execution key is operated while moving relative to the certain virtual map information and the cursor is aligned with the certain virtual map information, the map image around the original map information corresponding to the certain virtual map information is used by using the map data. A vehicle-mounted navigation device comprising: a map search processing unit that draws and displays on a display unit a screen. 2. A guide route storage means for storing guide route data connecting a starting point and a destination is provided, and the guide route or the destination is included in the specific map information extracted by the extracting means. The vehicle-mounted navigation device according to claim 1. 3. A map data storage medium storing map data including information data associated with specific map information, vehicle position detecting means for detecting a vehicle position, and display means for displaying a map image on a screen. The map data in a range wider than the screen display range is read out from the map data storage medium and stored in the temporary storage memory, and the map data around the vehicle position is drawn using the map data stored in the temporary storage memory. In a vehicle-mounted navigation device equipped with map display processing means for displaying marks on the display means, the map data stored in the temporary storage memory is compared with the map display range on the screen and is present near the vehicle position. Is extracted from the specific map information that is not within the map display range of the screen, and the map information extracted by the extraction means A coordinate transformation means for coordinate transformation on the map image in the display range, per the map information extracted by the extraction means, the virtual to draw over the virtual symbols corresponding to該地view information on the position after the coordinate transformation in the map image The symbol drawing means and the cursor key are moved relative to the map image integrated with the virtual symbol according to the operation of the cursor key, and when the execution key is operated while the cursor is aligned with a certain virtual symbol, a temporary storage memory An in-vehicle navigation device comprising: information search processing means for searching the information data corresponding to the virtual symbol using the map data stored in, and displaying the information on the screen of the display means.