JPS63184780A - Onboard navigator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an in-vehicle navigator that displays the current position of a vehicle on a road map.

[Conventional technology]

Conventionally, this type of device was disclosed in Japanese Patent Application Laid-Open No. 52-141662.
There is a "traffic device" that reads the map recorded on a recording medium such as microfilm with an optical reader using a vidicon camera, displays a road map of a specific area on a CRT, and also displays the current location of the vehicle. is detected and the current location is displayed on the road map display. In other words, Konomono uses microfilm as a recording medium,
The recorded road map is read by a vidicon camera and the road map is displayed directly on the CRT.

[Problem that the invention seeks to solve]

On the other hand, in order to make road map data storage more compact, it is conceivable to store map data as electronic information on a cassette tape or compact disc, etc.; however, storage media that stores map data as electronic information are When using the conventional technology described above, if the recorded contents are read and displayed directly on a display means such as a CRT, it takes time to read the map data and the road map cannot be displayed properly. Occur.

The present invention has been made in view of the above problems, and provides an in-vehicle navigator that can store map data for displaying a road map as electronic information and appropriately display a road map using the electronic information. The purpose is to

[Means for Solving the Problems] In order to achieve the above object, the present invention, as shown in FIG. 12, comprises: information generating means for generating vehicle position information that changes as the vehicle travels; A storage medium in which map data to be displayed is stored in advance as electronic information; a display means having a display surface made up of a plurality of pixels; and a display device that reads the map data from the storage medium and outputs the information to the vehicle from the information ordering means. An in-vehicle navigator comprising: a control means for causing the display means to display the current position of the vehicle and a road map overlaid using pixels on the display screen based on position information, the control means comprising: , a first electronic memory for storing road map display data corresponding to the road map display of the display means based on the map data from the storage medium; and current position display data corresponding to the current position display of the display means. a second electronic memory for storing, and superimposition of the current position of the vehicle and the road map on the display means using the road map display data of the first electronic memory and the current position display data of the second electronic memory. It is characterized by having a display control means for performing display.

〔Example〕

Examples illustrating the present invention will be described below. FIG. 1 is an overall configuration diagram showing one embodiment. In Fig. 1, reference numeral 1 denotes a direction detection device, which includes a direction sensor that detects the X and Y components of the earth's magnetism according to the direction in which the vehicle is traveling, and an A/D converter that converts the signal from this direction sensor into a digital signal. It generates digital signals of X and Y components depending on the traveling direction of the vehicle. Reference numeral 2 denotes a distance sensor that generates a distance pulse every unit traveling distance of the vehicle (for example, about 39.2 cm). Reference numeral 3 denotes a reading device that reads map data of a specific district by setting a cassette tape 3a serving as a storage means that stores map data of a plurality of districts (including absolute coordinate data of the upper right point of each map). It is something that is searched and read (hereinafter referred to as the margin).

4 is a microcomputer that executes software digital arithmetic processing according to a predetermined control program, and is equipped with a CPU 4 a, ROM 4 b, SRAM 4 C, and an I10 circuit section 4 b, and receives power from an on-board battery.
■ Stabilized power supply circuit that generates the stabilized voltage (not shown)
It enters the operating state by receiving a stabilizing voltage from the direction detector 1, receives the X1Y component digital signal from the direction detection device 1, the distance pulse from the distance sensor 2, the read signal from the reader 3, etc., and executes arithmetic processing. It also generates display signals for displaying specific area and driving route information. Incidentally, the RAM4C is always banked up with power from the on-vehicle battery.

Reference numeral 5 denotes a cathode ray tube (hereinafter referred to as CRT) controller, which receives display signals from the microcomputer 4 and individually stores map data, driving route information, and character data of a specific area, and also stores the stored map data and driving route information. , or generates a video signal and a synchronization signal for displaying character data in CR7.

Reference numeral 6 denotes a CRT display device as a display means, which displays a map of a specific area, a driving route, or characters in a CR7 format based on the video signal and synchronization signal from the CRT controller 5. 7 is a touch panel section, CR7 display device 6
The touch panel is mounted on the display surface of the touch panel, and when a specific touch area among the 12 divided touch areas provided on the touch panel is touched, a corresponding serial signal is generated. Note that the direction detection device 1, the distance sensor 2, the reading device 3, the microcomputer 4, and the CRT controller 5 constitute a control means.

Next, a detailed electrical wiring diagram of the CRT controller 5 shown in FIG. 2 will be explained. 11 is 12°096MHz
12 is a dot counter that divides the oscillation signal from the oscillation circuit 11 and generates a 6.048 MHz dot timing clock and a 756 kHz character timing clock; 13 is a dot counter that generates a 6.048 MHz dot timing clock and a 756 kHz character timing clock; A display controller generates a horizontal and vertical synchronization signal, a display timing signal, a refresh memory address signal, and a raster address signal according to commands and a character timing clock from the dot counter 12; 14 is a horizontal and vertical synchronization signal from the display controller 13; This is a hold signal generation circuit that generates a hold signal to the hold (HOLD) terminal of the microcomputer 40 to hold the microcomputer 4 during the display period based on the . 15 is an address signal from the microcomputer 4, a refresh memory address signal from the display controller 13, and a Lasque address (
No. 8 is a multiplexer that is switched by the hold-acknowledge (HOLDA) signal from the microcomputer 4, and 16, 17, and 18 are bus drivers that have a tri-state that switches the direction of data between the microcomputer 4 and the display memory. 19 is Microfunpiyu evening 4
20 is a character memory which stores display data such as ASCII code from the display controller 13 and outputs the contents as an address in response to a NoriFressini memory address signal from the display controller 13; This is a character generator that outputs a display pattern based on the Lasque address signal from. 21 is a first graphic memory that stores map data from the microcomputer 4;
22 is a second graphic memory that stores traveling route information (travel trajectory data, current position data) from the microcomputer 4; 23, 24, and 25 are character generators 20, and first and second graphic memories 2L22.
A parallel-to-serial (P-8) converter 26 converts the parallel signal from the dot counter 12 into serial data using the dot timing clock from the dot counter 12, and 26 is used to select between the graphic and character screens based on the screen switching signal from the microcomputer 4. P-8 converter 23 and P-3
Weird II! A video controller which switches reception of signals from the display controller 13 and generates a video signal according to the display timing signal from the display controller 13, and 27 is an exclusive OR circuit which generates a synchronization signal according to the horizontal and vertical synchronization signals from the display controller 13. be. Note that the character memory 19, the first and second graphic memories 2
On January 22nd, there was constant power backup from the on-board battery.

That is, this CRT controller 5 uses data sent from the microcomputer 4 to store character data in the character memory 19, map data in the first graphic memory 21, and display data of the travel trajectory and current position in the second class. is always stored in the flash memory 22,
The screen switching signal from the microcomputer 4 selects the graphic screen (displaying the travel trajectory and current position on the map) and the character screen (displaying specified characters, etc. to specify the district). The video signal and synchronization signal to display the corresponding screen on the CRT
This has occurred on display 6.

Further, the touch panel n7 has three touch panels as shown in FIG.
It has 12 touch areas numbered 1 to 42, and is composed of two pieces of glass and a transparent conductive film formed in a matrix on each glass.When a specific touch area is pressed, the glass The touch area is detected by the contact of the transparent conductive film of the matrix due to the deflection, and a serial signal (consisting of a start signal and a touch information signal) corresponding to the detected touch area is generated by a touch signal generation circuit (not shown). . Note that this touch signal generation circuit generates touch information at that time in the form of a serial signal every 49 m5ec.

Furthermore, FIG. 4 shows a data area corresponding to one district on the cassette tape 3a, and A is a header section that stores the absolute coordinates (coordinates with respect to the North Pole) of the upper right point of the map of that district. , B is a map data storage section that stores map data of the area, and X is a blank section. Therefore, by reading portions A and B with the reading device 3, map data and absolute coordinate data of a specific area can be provided to the microcomputer 4.

The operation of the above configuration will be explained with reference to the display explanatory diagram in FIG. 5 and the calculation flowcharts shown in FIGS. 6 to 10. FIG. 6 is a calculation flowchart showing the overall calculation processing of the main routine of the microcomputer 4, FIG. 7 is a calculation flowchart showing the calculation processing of the interrupt calculation routine based on the distance pulse from the distance sensor 2, and FIG. FIG. 9 is a calculation flowchart showing detailed calculation processing of the mode calculation routine in FIG. 6, FIG. 9 is a calculation flowchart showing detailed calculation processing of the current position calculation routine in FIG. 12 is a calculation flowchart showing detailed calculation processing of the cursor blinking calculation routine of FIG.

Now, in a vehicle equipped with components 1 to 7 shown in FIG. 1, when a key switch is turned on at the start of operation, each part of the electrical system is activated by receiving power from the vehicle battery. And in microcomputer 4,
It enters the operating state by receiving a stabilized voltage of 5V from the stabilized power supply circuit, starts its arithmetic processing at the start step 100 in FIG. Set counters, latches, etc. to the initial state necessary to start arithmetic processing. After this initial setting, the mode calculation routine 30
The arithmetic processing from 0 to cursor blinking arithmetic routine 500 is repeatedly executed at a period of approximately several tens of msec.

That is, in this mode calculation routine 300, one of map mode and character mode is selected, and contents corresponding to that mode are displayed on the CRT, and when in map mode, the cursor indicating the current position can be moved, and when in character mode, the cursor indicating the current position can be moved. At the time of , a calculation process that enables map designation of a specific area is executed, and the current position calculation routine 400 is executed.
Proceed to.

In this current position calculation routine 40σ, current position data and traveling trajectory data to be stored in the second graphic memory 22 in the CRT controller 5 are
Arithmetic processing is executed to change the contents of each component based on a travel change of ±50 m, and the program proceeds to the cursor blinking routine 5QQ. In this cursor blinking calculation routine 500, a calculation process is executed to change the storage state of the current position data in the second graphic memory 22 in order to make the cursor blink at a cycle of 0°6 seconds, and the process returns to the mode calculation routine 300. . Thereafter, the main routine arithmetic processing from the mode arithmetic routine 300 to the cursor blinking arithmetic routine 500 is repeatedly executed at a cycle of about several tens of m5ec.

When a distance pulse from the distance sensor 2 is applied to the interrupt (INT) terminal of the microcomputer 4 in response to the repeated calculations of this main routine, the microcomputer 4 temporarily suspends the calculation processing of the main routine. The interrupt calculation process shown in FIG. 7 is executed. That is, the calculation process is started from an interrupt start step 601, and the process proceeds to an integration step 602, where unit distance data (corresponding to about 39.2 am) is integrated into the distance data D stored in the RAM 4C and updated. Proceeding to distance determination step 603, it is determined whether the distance data D has reached 6.25 m.

At this time, if the distance data D has not reached 6.25 m, the determination will be No and the process will proceed to return step 610, but if the distance data D has reached 6.25 m, the determination will be Y.
The state becomes ES, and the process proceeds to direction signal manual step 604. Then, in this azimuth signal input step 604, the digital x and y component signals XaSYa (positive directions for east and north, negative directions for west and south) from the azimuth detection device 1 are input manually, and the process proceeds to step 605 for calculating an average direction. And the previous direction data Xo, Y.

(bearing data before traveling 6.25m) and current bearing data Xa, Ya to find average bearing data X, Y,
Proceeding to distance component calculation step 606, the distance component Dx in the X direction is 6.25X/fyTY, and the distance component in the Y direction is 6.25X/fyTY.
Find 6.25 Y/JMaT■＜x,,1J
TT? is c for the counterclockwise angle θ with the east direction as the reference
osθ, Y/, rma]=? (corresponds to sin θ), the process proceeds to storage step 607 and stores the current orientation data Xas Ya as Xo and Y for the next time.

The program then proceeds to distance data reset step 608 to reset the distance data D to O, proceeds to distance flag cent slap 609 to set the distance flag, and proceeds to return step 610 to return to the previously interrupted main routine. do. That is, in this interrupt calculation routine, the distance data D is cumulatively updated every time the unit distance is traveled, and when the distance data D reaches 6.25 m, this 6.25 m
A calculation process is executed to calculate the distance component DxSDy in the X1Y direction that reaches , and to set a distance flag.

Next, mode calculation routine 30 in the main routine
Detailed calculation processing of 0 will be explained. In this mode calculation routine 300, the calculation process is started from the touch data manual step 301 in FIG. 8, and the touch data from the touch panel section 7 is manually stored in the RAM 4C. Then, the process proceeds to map mode determination step 302 and the RAM 4
It is determined whether or not the content of the mode area in G is the map mode.
It is determined whether the touch data stored in C is data indicating a mode change (data when touch area 34 in FIG. 3 is pressed). At this time, if the touch data is data indicating a mode change, the determination is YES.
S, the process proceeds to character mode setting step 304 to set the contents of the mode area to character mode, and proceeds to step 305 to output a key/upkuku switching signal to set CR.
A character switching signal for displaying a character screen on the T display 6 is generated to the video controller 26 in the CRT controller 5, and this mode calculation routine 3
One calculation process of 00 is completed.

On the other hand, when the touch data is not data indicating a mode change, that is, data when a touch area other than 34 in FIG. 3 is pressed, or data when no touch area is pressed (for example, data FF). ), the determination in the mode change determination step 303 becomes No, and the process proceeds to the cursor movement determination step 306.

In this cursor movement determination step 306, it is determined whether the touch data is data when any of the touch areas 32.33, 35.38, or 40.41 is pressed (cursor movement data). , if the touch data is not cursor movement data, the determination becomes NO and one calculation process of this mode calculation routine 300 is completed, but if the touch data is cursor movement data, the determination becomes YES and the cursor is moved. The process advances to movement calculation step 307. In this cursor movement calculation step 307, CR is determined based on the touch data if this touch data is data for pressing the touch area 32 or 33.
7 Change the storage contents of the current position data in the second graph ink memory 22 in the CRT controller 5 so as to move the cursor of the current position displayed on the display device 6 northward by a predetermined distance (display screen The current position is stored in the RAM 4C as the X, Y coordinates with respect to the display screen, and the values of the X, Y coordinate data are changed).Similarly, if the touch data is data for pressing the touch area 35, the cursor is In the west direction, if the touch data is data for pressing the touch area 40 or 41, the cursor is moved southward, and if the touch data is data for pressing the touch area 38, the cursor is moved eastward by a predetermined distance. The calculation process for changing the storage contents of the current position data in the second graphic memory 22 is executed so that the current position data is stored in the second graphic memory 22, and one calculation process of this mode calculation routine 300 is completed.

On the other hand, if the determination in the map mode determination step 302 is No.
In this case, the process proceeds to mode change determination step 308, and it is determined whether or not the mode is to be changed using the same arithmetic processing as in mode change determination step 303. At this time, if the determination is YES when changing the mode, the map mode setting step 309
Proceed to step 310 to set the contents of the mode area in RAMdC to map mode, and proceed to data conversion step 310 to set the contents of the mode area in RAMdC to the CRT.
Second graphics memory 22 in controller 5
Convert driving route data. In this case, first the reading device 3
is controlled to search for the designated area using its map number, and calculate coordinate conversion values using the absolute coordinate data on the searched map (stored in the header RA shown in Figure 4) and the absolute coordinate data on the previous map of the area. The data of the running trajectory in the second graphic memory 22 is converted in a sliding manner according to the calculated value, and the X and Y coordinate data in the RAMJC are converted in the same manner. Then, the process proceeds to a map data reading/output step 311, in which the map data of the cassette tape 3a is inputted via the reading device 3, and the map data is output to the first graphic memory 21, and the process proceeds to a map switching signal output step 312. CR7
A map switching signal for displaying a map graphic screen on the display device 6 is generated to the video controller 26, and one calculation process of this mode calculation routine 300 is completed. That is, when switching from the character screen to the graphic screen of a map different from the previous one, the above calculation process is executed, the current map data is stored in the first graphic memory 21, and the current location corresponding to this map is displayed with the travel trajectory and A second button to correct the cursor indicating the current location.
The contents stored in the graphic memory 22 are converted.

As a result, even if the map displayed on the CR7 display device 6 is changed, the travel trajectory and current location can be displayed in the area corresponding to the map.

On the other hand, if the determination in the mode change determination step 308 is No.
If so, the process advances to character calculation step 313. When the character calculation step 313 is reached, the character mode is set and a character switching signal is being issued to the video controller 26.
The CR7 display device 6 displays a character screen as shown in FIG. The numbers 02-4-68 shown in the center of this character screen are numbers that designate regions, regions, and maps, respectively, and each number is determined by the increment switch 5.
1 is added and updated by 1, and the decrement switch 52
The character calculation step 313 performs arithmetic processing such that the value is updated by one at a time, set by the set switch 53, and reset by the reset switch 54.

Note that the numerical data of this region, region, and map, that is, the map number, is stored in the RAM 4G. Further, the switches 51, 52, 53, and 54 mentioned above correspond to the touch areas 39, 40, 41, and 42 in FIG. 3, respectively.

That is, the mode calculation routine 300 shown in FIG.
Now, the touch data from the touch panel section 7 and the RAM 4
■~ as shown below according to the contents of the mode area in C
■ Perform the operation.

■ If there is a cursor movement instruction when the map mode is on and the mode is not changed, the arithmetic processing for cursor movement is executed, and if there is no cursor movement instruction, the map display is continued as is.

■ If you are instructed to change the mode while in map mode,
Change map mode to character mode and CR
A character screen is displayed on the T display device 6.

- When in the character mode and not changing the mode, it is possible to accept changes to the map on the character screen as shown in FIG.

(2) When an instruction to change the mode is given while in the character mode, the character mode is changed to the map mode, a graphic screen of the map is displayed on the CRT display device 6, and at the same time, the traveling trajectory and current position are also corrected and displayed.

Next, the current position calculation routine 4 in the main routine
The detailed arithmetic processing of 00 will be explained.

In this current position calculation routine 400, the calculation process starts from the distance flag determination step 401 in FIG.
In the interrupt calculation process shown in the figure, it is determined whether the distance flag is set. At this time, if the distance flag is not set, the determination becomes NO and one calculation process of this current position calculation routine 400 is completed, but if the distance flag is set, the determination becomes YES and The process advances to distance correction step 402. Then, in this X distance correction step 402, a correction calculation is made (DX=DX+D
x) Y distance data D in L and Y distance correction step 403
Simultaneously correct Y (DY=DY+Dy) L, first X
Proceeding to distance determination step 404, the X distance data DX is 5.
It is determined whether the value is 0m or more. At this time, X
If the distance data DX is 50m or more, the judgment is Y.
ES, proceed to X distance subtraction step 405, subtract the value of 50 m from the X distance data DX, proceed to display movement step 406, and change the X1Y coordinate data stored in RAM4C by 50 meters in the positive direction (eastward). At the same time, the traveling locus data in the second graphic memory 22 is also moved accordingly.

Further, the determination in the first X distance determination step 404 is N
If o, the process proceeds to a second X distance determination step 407, where it is determined whether the X distance data DX has reached a value of 150 m or less. At this time, if the X distance data DX has a value of 150 m or less, the determination becomes YES, and the process proceeds to the X distance addition step 408, where the value of 50 m is added to the X distance data DX, and the process proceeds to the display movement step 409. The X, Y coordinate data stored in the RAM 4C is converted in the negative direction (westward) by 50 m, and the traveling locus data in the second graphic memory 22 is also moved accordingly.

Then, when the judgment in the second X distance judgment step 407 is NO, or after the display movement steps 406 and 409, the process proceeds to the Y component display movement processing routine 410, and the Y distance data DY calculated in the Y distance correction step 403 is , the same determination and calculation processing as in steps 404 to 409 described above is performed. (When the Y distance data DY reaches a value of 50 m or more in either the positive or negative direction, the X and Y coordinate data in the RAM 4C and the travel locus data in the second graphic memory 22 are moved by 50 m in the corresponding direction.

) Then, the process proceeds to the next distance flag reset step 411 to reset the distance flag.

That is, the current position calculation routine 40 shown in FIG.
0, the X1Y coordinate data in the RAMdC and the traveling locus data in the second graphic memory 22 IIl, l# regardless of the screen displayed on the CRT display device 6.
Do I.

Next, detailed calculation processing of the cursor blinking calculation routine 500 will be explained. This cursor blinking calculation routine 50
0, the arithmetic processing starts at timer flag determination step 501 in FIG. If the timer flag is not set, the determination becomes No and one calculation process of this cursor blinking calculation routine 500 is completed, but if the timer flag is set, the determination becomes YES and the display flag is Proceeding to determination step 502, it is determined whether a display flag indicating that the current position is being displayed is set. Then, if the display flag is reset, the determination is NO.
, proceed to current position data creation step 503, and press R.
Create current position data using the X, Y coordinate data stored in the AM4C (create X, Y coordinate data and a total of nine pieces of data for displaying the current position surrounding it), and proceed to display output step 504. Out of the current position data created in , display data that does not include the travel locus data already stored in the second graphic memory 22 is created by referring to the contents in the second graphic memory 22, and thereby the travel Data for displaying a cursor portion that does not include a trajectory is output to the second graphic memory 22 and stored therein, the process proceeds to a display flag setting step 505 to set a display flag, and a timer flag reset step 50
6, the timer flag is reset, and one calculation process of this cursor blinking calculation routine 500 is completed. Note that the display data created earlier is stored in RAM4C,
It may also be converted in conjunction with calculations in the cursor movement process (step 307) or display movement process (steps 406, 409, etc.) described above. (In this case, the display data is first read from the RAM 4C, the display data that is worth erasing is selected for movement, and the data in the second graphic memory 22 corresponding to this display data and the selected display data are Clear the data, and then read the data of the area to be newly displayed based on the updated current position data X and Y from the second graphic memory 22,
As a result, display data is created for the portion that does not include the travel trajectory, and this is stored in the RAM4C.
Data corresponding to the display data is output to the second graphic memory 22 and stored therein. ) On the other hand, if the determination in the display flag determination step 502 is YES, the process proceeds to a display data successive generation step 507, in which the display data stored in the RAM 4C is read out, and the display clear step 50
Proceeding to step 8, the read display data clears the data that caused the cursor portion not including the traveling trajectory to be displayed from within the second graphic memory 22, and the process proceeds to display flag reset step 509, where the display flag is reset and the timer flag is reset. Proceed to reset step 506.

That is, in this cursor blinking calculation routine 500,
A timer flag is set every 0.6 seconds by an internal timer, and if the display flag is set, current position data is created, and display data that does not include travel trajectory data is stored in the second graphic memory. 2
The data for displaying the cursor part that does not include the travel trajectory is stored in the second graphic memory 22, and if the display flag is reset, the display read from the RAM 4C. The data in which the cursor portion that does not include the traveling trajectory is displayed is cleared from the second graphic memo 1J22. Therefore, in the CR7 display device 6, a cursor (consisting of nine pixels) indicating the current position blinks at a cycle of 0.6 seconds.

Therefore, the current position data and traveling trajectory data in the second graphic memory 22 are sequentially changed by the main routine repeater of the mode calculation routine 300 to the cursor blinking calculation routine 500 and the interrupt calculation shown in FIG. CR7 according to the specified mode.
Select the screen of the display device 6, and if it is in the map mode, the map graphic screen (including the display of the current position and driving trajectory) will be displayed, and if it is the character mode, the character screen for specifying the map shown in Fig. 5 will be displayed. image.

In the above embodiment, the cursor indicates the current position by blinking one pixel indicating the current position and a total of 9 pixels surrounding it. However, the pixels to be displayed blinking can be selected arbitrarily; It may also be a pixel.

In addition, although the current position is calculated based on the signals from the direction detection device 1 and the distance sensor 2, a transmitter is installed at each point on the road, and information on the current position is received from the transmitter. It's okay.

Furthermore, although the CR7 display device 6 is shown as a display means,
A liquid crystal display device, an EL display device, etc. may also be used.

Further, although the cassette tape 3a is shown as a storage means, a 1-chip ROM storing map data may be used interchangeably.

Furthermore, it is also possible to make the display of the current position and the trajectory up to the present blink. FIG. 11 shows the circuit configuration in this case. In this circuit configuration, between the second graphic memory 22 and the video controller 26, there is a buffer 28 that can create a CRT negative state in a negative state, and a buffer 28 that receives a signal from a 0.6 second timer 30 and receives a signal from a 0.6 second timer 30. FF that can shift the buffer 28 to active and negative states at 6 second intervals
29 is inserted. Other than that, the configuration is the same as that in FIG. 2. In this case, the cursor blinking calculation shown in FIG. 10 is not performed. Therefore, when the graphic screen of the map is displayed on the CR7 display device 6, the display of the current position and the traveling trajectory can be made to blink at a cycle of 0.6 seconds.

〔Effect of the invention〕

As described above, in the present invention, map data from a storage medium storing map data as electronic information is not used as it is for displaying a road map on a display means, but a first electronic memory is interposed between the map data and the map data stored in the storage medium as electronic information. Since the road map display data corresponding to the road map display of the display means is stored, there is no need to access the storage contents of various storage media for displaying the road map. Since the road map can be displayed through data processing between the two, there is an excellent effect that the road map can be displayed appropriately when using a storage medium that stores map data as electronic information.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing one embodiment of the present invention, FIG. 2 is a detailed electrical wiring diagram of the CRT controller in FIG. 1, and FIG.
The figure is an explanatory diagram showing the touch area of the touch panel section.
Fig. 5 is an explanatory diagram showing the data area of the cassette tape, Fig. 5 is an explanatory display diagram showing the display state of the CRT display device, Fig. 6 is a calculation flowchart showing the overall calculation processing of the main routine of the microcomputer, and Fig. 7 8 is a calculation flowchart showing the calculation processing of the interrupt calculation routine based on the distance pulse from the distance sensor 2, FIG. 8 is a calculation flowchart showing the detailed calculation processing of the mode calculation routine in FIG. 6, and FIG. FIG. 10 is a calculation flowchart showing detailed calculation processing of the current position calculation routine in FIG. 6. FIG. 11 is a calculation flowchart showing detailed calculation processing of the cursor blinking calculation routine in FIG. FIG. 12 is a diagram illustrating the main electrical wiring diagram of an example, and is a configuration diagram showing the configuration of the present invention. 1... Orientation detection device, 2... Distance sensor, 3...
Reading device, 3a... cassette tape, 4... microcomputer, 5... CRT controller, 6...
・CRT display device.

Claims (1)

[Scope of Claims] Information generating means for generating vehicle position information that changes as the vehicle travels; a storage medium that stores map data in advance as electronic information for displaying a road map; and a plurality of pixels. display means having a display surface configured to read out map data from the storage medium, and display the current state of the vehicle on the display means using pixels on the display surface based on vehicle position information from the information generation means; an in-vehicle navigator comprising: a control means for displaying a position and a road map in a superimposed manner; a first electronic memory for storing road map display data; a second electronic memory for storing current position display data corresponding to the current position display of the display means; and a road map display data of the first electronic memory. An in-vehicle navigator comprising: a display control means for superimposing a display of the current position of the vehicle and a road map on the display means using the current position display data of the second electronic memory.