JP4376295B2 - Car navigation system and map display method - Google Patents

Description

  The present invention relates to a technique for displaying a map and a logo mark of a facility on a display device.

  In general, a car navigation device displays a predetermined range of map data on a display device around the current position of the vehicle. In addition, when various facilities such as public facilities and gas stations exist in the displayed map range, a navigation device that displays these facilities as a logo mark is known (see, for example, Patent Document 1). There is also known a navigation device in which facilities are classified by genre and a user can select a genre of facilities to be displayed on a map.

  In the above navigation device, when the user is set to display facilities of many genres, when the vehicle travels in an area where there are many facilities such as a big city, a large number of maps are displayed on the display device. There is a problem that it becomes buried with the logo mark and the important roads are not visible.

Japanese Patent Laid-Open No. 11-351888

  The above is given as an example of the problem to be solved by the present invention. An object of the present invention is to display a necessary logo mark in an in-vehicle navigation device in an easy-to-see manner according to the driving conditions of the vehicle.

  In a preferred embodiment of the present invention, the in-vehicle navigation device includes a map display means for displaying a map of a display area including the current position of the vehicle, and a logo mark display for displaying a logo mark of a facility existing in the display area. Means, and the logo mark display means controls the display of the logo mark based on the running condition of the vehicle.

  Said navigation apparatus displays the map of the display area containing the present position of a vehicle on a display apparatus etc., and displays the logo mark of the facility which exists in the display area. A logo mark is a mark indicating a facility, and usually represents a type or characteristic of the facility expressed in characters or graphics. Here, the display of the logo mark is controlled according to the traveling condition of the vehicle. Therefore, an appropriate logo mark is displayed in an easy-to-see state based on the driving conditions of the vehicle.

  In one aspect of the in-vehicle navigation device, the logo mark display means determines the type of logo mark to be displayed according to the speed of the vehicle. In this aspect, the logo mark displayed changes according to the speed of the vehicle. For example, when the vehicle speed is relatively low, many types of logo marks are displayed, and when the vehicle speed is relatively high, only the necessary types of logo marks are displayed. To do.

  In another aspect of the in-vehicle navigation device, the logo mark display means determines a type of logo mark to be displayed according to a type of road on which the vehicle is traveling. In this aspect, the logo mark displayed changes according to the type of road on which the vehicle is traveling. For example, only logos of facilities accessible from the expressway are displayed on the expressway.

  In another aspect of the in-vehicle navigation device, the logo mark display means determines whether or not to display a logo mark corresponding to the facility according to the frequency of the vehicle visiting the facility. In this aspect, the displayed logo mark changes according to the frequency of use by the user. For example, a logo mark of a facility having a high use frequency is displayed with priority over a logo mark of a facility having a low use frequency. Thereby, the user can easily find a facility that is frequently used every day.

  In another aspect of the vehicle-mounted navigation device, the logo mark display means is a facility located within a predetermined range from the current position of the vehicle and within a predetermined distance from the road on which the vehicle is traveling. Do not display the logo. In this aspect, the logo mark in the vicinity of the road on which the vehicle is traveling is not displayed because the road itself cannot be seen if it is displayed over the road. This ensures the visibility of roads that are inherently highly important.

  In another aspect of the in-vehicle navigation device, the logo mark display means is within a predetermined range from the current position of the vehicle and outside a predetermined distance from an intersection, and is a predetermined distance from a road on which the vehicle is traveling. Do not display the logo mark of the facilities existing in the house. In this aspect, the logo mark in the vicinity of the road on which the vehicle is traveling is not displayed in principle because the road itself cannot be seen if it is displayed on the road. This ensures the visibility of roads that are inherently highly important. However, the logo mark in the vicinity of the intersection is often displayed as an exception because it often serves as a mark such as a left or right turn by the user.

  In another aspect of the above-described vehicle-mounted navigation device, the logo mark display means switches and displays the plurality of logo marks at predetermined time intervals when the display positions of the plurality of logo marks overlap. Thereby, even when a logo mark overlaps, it can display easily.

  In another embodiment of the present invention, a map display method executed in an in-vehicle navigation device includes a map display step of displaying a map of a display area including a current position of a vehicle, and a logo of a facility existing in the display area. A logo mark display step for displaying a mark, and the logo mark display step controls the display of the logo mark based on the running conditions of the vehicle. According to this map display method, an appropriate logo mark is displayed in an easy-to-see state based on the driving conditions of the vehicle.

  In another embodiment of the present invention, a map display program executed in an in-vehicle navigation device including a computer has map display means for displaying a map of a display area including a current position of the vehicle, and exists in the display area. The computer is made to function as a logo mark display means for displaying a logo mark of a facility to be operated, and the logo mark display means controls the display of the logo mark based on the running conditions of the vehicle. By executing this program in the in-vehicle navigation device, an appropriate logo mark is displayed in an easy-to-see state based on the driving conditions of the vehicle. This program can be suitably handled in a state stored in a storage medium.

It is a block diagram which shows schematic structure of a navigation apparatus. The structural example of the display classification table classified by use frequency is shown typically. The example of a display classification table header and a usage frequency record is shown. The structural example of the display classification table according to road class is shown typically. The example of a display classification table header, a display classification record, and a display classification code table is shown. The structural example of the display classification table classified by speed band is shown typically. The example of a display classification table header, a display classification record, and a display classification code table is shown. It is a flowchart of a basic display process. It is a flowchart of the example of a logo mark display process. It is an example of a display during driving on a general road and an expressway. It is an example of a display when a logo mark overlaps. It is an example of a display at the time of deleting the logo mark near the running road.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Navigation apparatus 10 Self-supporting positioning apparatus 18 GPS receiver 20 System controller 22 CPU
36 Data storage unit 40 Display unit 60 Input device

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The following description shows an example in which the present invention is applied to a vehicle navigation apparatus.

(Navigation device)
FIG. 1 shows the configuration of the navigation device 1. As shown in FIG. 1, the navigation device 1 includes a self-supporting positioning device 10, a GPS receiver 18, a system controller 20, a disk drive 31, a data storage unit 36, a communication interface 37, a communication device 38, a display unit 40, an audio output. A unit 50 and an input device 60 are provided.

  The autonomous positioning device 10 includes an acceleration sensor 11, an angular velocity sensor 12, and a distance sensor 13. The acceleration sensor 11 is made of, for example, a piezoelectric element, detects vehicle acceleration, and outputs acceleration data. The angular velocity sensor 12 is composed of, for example, a vibrating gyroscope, detects the angular velocity of the vehicle when the direction of the vehicle is changed, and outputs angular velocity data and relative azimuth data. The distance sensor 13 measures a vehicle speed pulse composed of a pulse signal generated with the rotation of the vehicle wheel.

  The GPS receiver 18 receives radio waves 19 carrying downlink data including positioning data from a plurality of GPS satellites. The positioning data is used to detect the absolute position of the vehicle from latitude and longitude information.

  The system controller 20 includes an interface 21, a CPU (Central Processing Unit) 22, a ROM (Read Only Memory) 23, and a RAM (Random Access Memory) 24, and controls the entire navigation device 1.

  The interface 21 performs an interface operation with the acceleration sensor 11, the angular velocity sensor 12, the distance sensor 13, and the GPS receiver 18. From these, vehicle speed pulses, acceleration data, relative azimuth data, angular velocity data, GPS positioning data, absolute azimuth data, and the like are input to the system controller 20. The CPU 22 controls the entire system controller 20. The ROM 23 includes a nonvolatile memory (not shown) in which a control program for controlling the system controller 20 is stored. The RAM 24 stores various data such as route data preset by the user via the input device 60 so as to be readable, and provides a working area to the CPU 22.

  A system controller 20, a disk drive 31 such as a CD-ROM drive or a DVD-ROM drive, a data storage unit 36, a communication interface 37, a display unit 40, an audio output unit 50, and an input device 60 are mutually connected via a bus line 30. It is connected to the.

  The disk drive 31 reads and outputs content data such as music data and video data from a disk 33 such as a CD or DVD under the control of the system controller 20. The disk drive 31 may be either a CD-ROM drive or a DVD-ROM drive, or may be a CD and DVD compatible drive.

  The data storage unit 36 is configured by, for example, an HDD and stores various data used for navigation processing such as map data and facility data. Details of the map data will be described later.

  The communication device 38 includes, for example, an FM tuner, a beacon receiver, a mobile phone, a dedicated communication card, and the like, and traffic congestion and traffic information distributed from a VICS (Vehicle Information Communication System) center via the communication interface 37. Receive road traffic information and other information.

  The display unit 40 displays various display data on a display device such as a display under the control of the system controller 20. Specifically, the system controller 20 reads map data from the data storage unit 36. The display unit 40 displays the map data read from the data storage unit 36 by the system controller 20 on a display screen such as a display. The display unit 40 includes a graphic controller 41 that controls the entire display unit 40 based on control data sent from the CPU 22 via the bus line 30 and image information that can be displayed immediately, such as a VRAM (Video RAM). A buffer memory 42 that temporarily stores, a display control unit 43 that controls display of a display 44 such as a liquid crystal display or a CRT (Cathode Ray Tube) based on image data output from the graphic controller 41, and a display 44 are provided. . The display 44 is composed of, for example, a liquid crystal display device having a diagonal of about 5 to 10 inches, and is mounted near the front panel in the vehicle.

  The audio output unit 50 performs D / A (Digital to Analog) conversion of audio digital data sent from the CD-ROM drive 31, DVD-ROM 32, RAM 24, or the like via the bus line 30 under the control of the system controller 20. A D / A converter 51 to perform, an amplifier (AMP) 52 that amplifies the audio analog signal output from the D / A converter 51, and a speaker 53 that converts the amplified audio analog signal into sound and outputs the sound into the vehicle. It is prepared for.

  The input device 60 includes keys, switches, buttons, a remote controller, a voice input device, and the like for inputting various commands and data. The input device 60 is arranged around the front panel and the display 44 of the main body of the in-vehicle electronic system mounted in the vehicle. When the display 44 is a touch panel system, the touch panel provided on the display screen of the display 44 also functions as the input device 60.

[Logo display]
Next, the logo mark display according to the present embodiment will be described. In the present embodiment, the type of logo mark displayed on the map displayed on the display 44 is controlled in accordance with the traveling condition of the vehicle on which the navigation device 1 is mounted. The vehicle traveling conditions include the frequency of using the facility corresponding to the logo mark (hereinafter referred to as “usage frequency”), the type of road on which the vehicle travels (hereinafter referred to as “road class”), and The running speed of the vehicle can be mentioned.

  The system controller 20 shown in FIG. 1 determines the type of facility logo mark to be displayed on the map in accordance with the traveling conditions of these vehicles. For this reason, the data storage unit 36 is prepared in advance with a display type table that defines the types of logo marks to be displayed for each driving condition of these vehicles. Specifically, a display classification table by use frequency, a display classification table by road class, and a display classification table by speed band are prepared. “Type” refers to the type and genre of the facility corresponding to the logo mark, and the various logo marks that can be displayed by the navigation device 1 are classified by type.

(frequency of use)
First, the logo mark display control according to the usage frequency will be described. The system controller 20 stores the use frequency of the facility corresponding to the logo mark for each type of the facility, and determines the type of the logo mark of the facility to be displayed on the map based on the use frequency. FIG. 2 schematically illustrates a configuration example of the display classification table 110 by use frequency. As illustrated, the display type table 110 by use frequency includes a display type table header 111 and a plurality of use frequency records 112.

  FIG. 3A shows the contents of the display type table header 111. As shown in the figure, the display type table header 111 includes management information of the display type table 110 by use frequency as a whole. Specifically, the “use frequency type definition number”, “use frequency record number”, and “use frequency record” are used. "Frequency record size" and "Offset to usage frequency record head".

  The “number of use frequency type definitions” is the number of types of facilities specified in the display type table 110 by use frequency. The “number of usage frequency records” is the number of usage frequency records included in the display classification table 110 by usage frequency, and is N in the example of FIG. “Usage frequency record size” indicates the data size of each usage frequency record 112. “Offset to usage frequency record head” is information indicating the storage location of the first usage frequency record among the plurality of usage frequency records 112 (that is, usage frequency record # 1). That is, the usage frequency record # 1 is stored in the storage area of the display type table 110 by usage frequency from the storage location next to the offset value.

  FIG. 3B shows the contents of the usage frequency record 112. Each usage frequency record 112 is data indicating the usage frequency totaled for each type of facility, and includes “type code” and “number of uses”. The “type code” is a code indicating the type of facility corresponding to the logo mark. “Use count” indicates the number of times the user has used the facility of the type indicated by the type code, that is, the number of times the vehicle has visited. Therefore, each usage frequency record 112 stores how frequently the user has used the facility of the type corresponding to it.

  Thus, the display classification table 110 classified by use frequency stores the use frequency of each facility by the user. Therefore, the system controller 20 refers to the display classification table 110 by frequency of use, and displays, for example, only logo marks of facilities belonging to the type having high usage frequency (specifically, the number of times of use being a predetermined number or more) on the map. It is possible to perform control such as displaying on the screen. Thereby, it is possible to appropriately display a logo mark of a facility that is frequently used, that is, a facility that is beneficial to present to the user. For example, it is possible to perform control so that the convenience store logo mark is preferentially displayed for a user who frequently uses a convenience store.

(Road class)
Next, the logo mark display control according to the road class will be described. The system controller 20 determines the type of the logo mark of the facility to be displayed on the map for each classification (referred to as “road class”) based on the type and type of road on which the vehicle is traveling. FIG. 4 schematically shows a configuration example of the road class-specific display type table 120. As illustrated, the display classification table 120 by road class includes a display classification table header 121, a plurality of display classification records 122, and a display classification code table 123.

  FIG. 5A shows the contents of the display type table header 121. As shown in the figure, the display type table header 121 includes management information for the display class table 120 by road class as a whole. Specifically, “the number of road class definitions”, “the number of road class records”, “the road class” "Record size" and "Offset to road class record head" are included.

  The “number of road class definitions” is the number of road classes defined in the display class table 120 by road class. The road class can be, for example, an expressway, a toll road, a national road, a prefectural road, or the like. The “number of road class records” is the number of display type records 122 included in the display type table 120 by road class, and is N in the example of FIG.

  “Road class record size” indicates the data size of each display type record 122 included in the display type table 120 by road class. “Offset to road class record head” is information indicating the storage position of the head display type record (that is, display type record # 1) among the plurality of display type records 122. In other words, the display type record # 1 is stored in the storage area of the road class display type table 120 from the storage position next to the offset value.

  FIG. 5B shows the contents of the display type record 122. Each display type record 122 includes “road class code”, “number of display type codes”, “size of display type code table”, and “offset of display type code table”. “Road class code” indicates a road class to which the display type record is applied, and indicates a road class such as an expressway or a national road, for example. “Number of display type codes” indicates the number of type codes of facilities to be displayed when a vehicle is traveling on a road of the road class. The “display type code table size” is the data size of the display type code table corresponding to the display type record 122. “Display type code table offset” is information indicating the storage position of the display type code table 123 corresponding to the display type record 122. That is, in the storage area of the road class-specific display type table 120, the corresponding display type code table 123 is stored from the storage position next to the offset value.

  FIG. 5C shows the contents of the display type code table 123. Each display type code table 123 includes a plurality of display type codes. The plurality of display type codes stipulate the display type codes of facilities that are displayed as logo marks when the vehicle is traveling on a road class road specified in the corresponding display type record 122.

  For example, the road type code of the display type record # 1 indicates an expressway, and the display type indicating a parking lot, a gas station, and a toilet as the display type code in the display type code table # 1 corresponding to the display type record # 1 Assume that the code is specified. In this case, the navigation device 1 displays the logo marks of the parking lot, the gas station, and the toilet when the vehicle is traveling on the highway.

  In this way, by determining the facility to be displayed according to the road class of the road on which the vehicle is traveling, the logo mark of the necessary facility is preferentially displayed while traveling on the road, By not displaying the logo mark of the facility with low importance, the logo mark of the facility with high importance can be easily seen.

  It should be noted that the user can arbitrarily set the contents of the above-described road class display type table 120, that is, what kind of logo mark is displayed on various roads. In that case, the content of the display classification table classified by road class is changed according to the setting change of the user.

(Speed band)
Next, logo mark display control according to the speed band will be described. The system controller 20 classifies the traveling speed of the vehicle into a plurality of ranges (hereinafter, each classified range is referred to as a “speed band”), and the logo mark of the facility to be displayed on the map is displayed for each speed band. Determine the type. The speed band is defined with a predetermined width such as “0 to 20 km / h”, “21 to 60 km / h”, “61 to 100 km / h”, “101 km / h or more”, and the like.

  FIG. 6 schematically shows a configuration example of the display classification table 130 for each speed band. As illustrated, the display classification table for each speed band 130 includes a display classification table header 131, a plurality of display classification records 132, and a display classification code table 133.

  FIG. 7A shows the contents of the display type table header 131. As shown in the figure, the display type table header 131 includes management information for the entire display type table 130 for each speed band. Specifically, “number of speed band definitions”, “number of speed band records”, “speed band” "Record size" and "Offset to speed band record head".

  The “number of speed bands defined” is the number of speed bands defined in the display classification table 130 for each speed band, and is “4” in the above classification example. The “number of speed band records” is the number of display type records 132 included in the display type table 130 for each speed band, and is N in the example of FIG.

  The “speed band record size” indicates the data size of each display type record 132 included in the display type table 130 for each speed band. “Offset to speed band record head” is information indicating the storage position of the head display type record (that is, display type record # 1) among the plurality of display type records 132. That is, in the storage area of the display type table for each speed band 130, the display type record # 1 is stored from the storage position next to this offset value.

  FIG. 7B shows the contents of the display type record 132. Each display type record 132 includes “speed lower limit”, “speed upper limit”, “number of display type codes”, “size of display type code table”, and “offset of display type code table”. “Speed lower limit” and “Speed upper limit” define the speed band to which the display type record is applied. For example, in the case of a speed band of “0 to 20 km / h”, the lower speed limit is “0 km” and the upper speed limit is “20 km”. The “display type code number” indicates the number of type codes of facilities to be displayed when the vehicle is traveling at the speed of the speed band. The “display type code table size” is the data size of the display type code table 133 corresponding to the display type record 132. “Display type code table offset” is information indicating the storage position of the display type code table 133 corresponding to the display type record 132. That is, in the storage area of the display classification table for each speed band 130, the corresponding display classification code table 133 is stored from the storage position next to this offset value.

  FIG. 7C shows the contents of the display type code table 133. Each display type code table 133 includes a plurality of display type codes. The plurality of display type codes define facility display type codes that are displayed as logo marks when the vehicle is traveling at a speed in the speed band specified in the corresponding display type record 132.

  For example, the speed band of the display type record # 1 is “21 to 60 km / h”, and the display type code indicating the convenience store and the gas station as the display type code in the display type code table # 1 corresponding to the display type record # 1 Is defined. In this case, the navigation device 1 displays the logo mark of the convenience store and the gas station when the vehicle is traveling at a speed of 21 to 60 km / h.

  In this way, by determining the facility to be displayed according to the traveling speed of the vehicle, the logo mark of the necessary facility is preferentially displayed while traveling at that speed, and the facility of low importance is displayed. By not displaying the logo mark, it is possible to make it easier to see the logo mark of facilities with high importance.

  It should be noted that the user can arbitrarily set the contents of the above-described display classification table 130 for each speed band, that is, what kind of logo mark is displayed in each speed band. In that case, the content of the display classification table classified by speed band is changed according to the user's setting change.

(Basic display processing)
Next, a basic display process for determining a logo mark to be displayed on a map according to the use frequency, road class, and speed band will be described. FIG. 8 is a flowchart of the basic display process. This process is realized by the CPU 22 in the system controller 20 executing a program prepared in advance. This flowchart is executed in a state where a map near the current position of the vehicle is already displayed on the display 44.

  First, the CPU 22 checks the prepared logo mark data (step S1). The logo mark data corresponding to each facility is stored in advance in the data storage unit 36 in a state of being classified for each corresponding facility type (genre). For example, the CPU 22 obtains display type codes corresponding to all logo marks stored in the data storage unit 36, and determines all logo marks that are prepared in advance and can be displayed.

  Next, the CPU 22 detects the current traveling speed of the vehicle, refers to the display classification table classified by speed band, and acquires the display classification to be displayed at the traveling speed (step S2). Next, the CPU 22 checks the road class of the road on which the vehicle is currently traveling, refers to the display class table for each road class, and acquires the display type to be displayed while traveling on the road (step S3). Further, the CPU 22 refers to the display type table by use frequency and acquires a display type having a high use frequency (step S4).

  Then, the CPU 22 extracts only the display types acquired in steps S2 to S4 from all the display types examined in step S1 (step S5), and stores the logo mark data of the extracted display types in the data storage unit 36. And is displayed on the map displayed on the display 44 (step S6). Thus, an appropriate facility logo mark is displayed on the map in accordance with the use frequency, road class, and speed band.

(Example of logo mark display processing)
Next, a preferred logo mark display processing example for determining a logo mark to be displayed on the map according to the road class and the speed band will be described. FIG. 9 shows a flowchart of an example of logo mark display processing. This logo mark display process is realized by the system controller 20, particularly the CPU 22, executing a program prepared in advance. This logo mark display process is started in a state where a map near the current position of the vehicle is already displayed on the display 44.

  First, the system controller 20 determines whether or not the vehicle is traveling (step S11). The system controller 20 determines whether or not the vehicle is traveling based on the vehicle speed pulse output from the distance sensor 13 and / or the change in the current position of the vehicle detected by the GPS 19. When the vehicle is not running (step S11; No), the system controller 20 displays all types of logo marks prepared in advance (step S24) and ends the process. In step S24, if the navigation device 1 is set not to display all logo marks, the logo marks are not displayed. In addition, only the logo mark of the type set as the display target is displayed when it is set to display only a specific type of logo mark by user selection etc. Is done.

  On the other hand, when the vehicle is traveling (step S11; Yes), the system controller 20 searches for the road on which the vehicle is traveling based on the current position of the vehicle and the road data stored in the data storage unit 36. Then, the road class is determined (step S12). When the determined road class is an expressway (step S13; Yes), the system controller 20 accesses the logo mark data stored in the data storage unit 36, and logos of the facilities around the running road. The mark and its position coordinates are extracted (step S14).

  Next, when displaying a plurality of extracted logo marks, the system controller 20 determines whether or not they overlap each other on the display 44 (step S15). When the logo mark does not overlap (Step S15; No), the system controller 20 displays only the logo mark of the facility on the expressway among the extracted logo marks (Step S16). In step S16, only the logo mark of the facility ahead of the traveling direction from the current position of the vehicle may be displayed, and the logo mark may be deleted when the current position passes the position of the logo mark.

  FIG. 10A shows a logo mark display example when the vehicle is traveling on a general road, and FIG. 10B shows a logo mark display example when the vehicle is traveling on a highway. In the display example 140a shown in FIG. 10A, the highway 149 is displayed on the map, but the vehicle is traveling on a general road, and the current position mark 141 of the vehicle is on the general road. In this case, a parking lot, a toilet, a gas station, a convenience store, and a family restaurant are defined as types to be displayed. In the display example 140a, a parking logo 142, a toilet logo 143, a gas station A logo mark 144, a convenience store logo mark 145, and a family restaurant logo mark 146 are displayed.

  On the other hand, when only the expressway facility is displayed in step S16, the display example 140b during traveling on the expressway shown in FIG. 10B is displayed. Here, assuming that only a parking lot, a toilet, and a gas station are defined as types to be displayed during highway traveling, the display example 140b during highway traveling includes a parking lot logo mark 142, a toilet Logo mark 143 and a gas station logo 144 are displayed. However, as can be seen from comparison with FIG. 10A, the convenience store logo mark 145 and the family restaurant logo mark 146 are not displayed.

  Returning to FIG. 9, when a plurality of logo marks overlap (step S15; Yes), the system controller 20 switches and displays the overlapping logo marks at predetermined time intervals (step S17). FIG. 11 shows a display example when overlap occurs in a plurality of logo marks. When the logo mark overlaps, the system controller 20 alternately displays the image 140c shown in FIG. 11A and the image 140d shown in FIG. 11B at predetermined time intervals. In the example of FIG. 11, the parking lot logo mark 147 and the toilet logo mark 148 overlap each other. In the image 140c, a toilet logo mark 148 indicated by a solid line is displayed, and a parking lot logo mark 147 indicated by a broken line is not displayed. On the other hand, in the image 140d, a parking lot logo mark 147 indicated by a solid line is displayed, and a toilet logo mark 148 indicated by a broken line is not displayed. In this example, the logo mark indicated by the broken line is not displayed. Instead, as shown in FIG. 11, the logo mark indicated by the solid line is displayed on the logo mark indicated by the broken line, and at predetermined time intervals. The vertical relationship of the display may be changed.

  Next, when it is determined in step S13 that the road on which the vehicle is traveling is not a highway, the system controller 20 detects the speed of the vehicle (step S18). The speed of the vehicle (also referred to as “vehicle speed”) can also be determined based on the vehicle speed pulse output from the distance sensor 13 and / or the change in the current position of the vehicle detected by the GPS 19.

  When the detected vehicle speed is equal to or lower than the predetermined speed (step S19), the system controller 20 displays all types of prepared logo marks (step S24) and ends the process.

  On the other hand, when the vehicle speed exceeds the predetermined speed (step S19; Yes), the system controller 20 extracts the logo mark of the facility within the predetermined distance from the road within the predetermined range from the current position of the vehicle and the position coordinates thereof (step S19). S20). The predetermined range and the predetermined distance are determined according to the scale of the currently displayed map, the display range, and the like. Next, the system controller 20 determines whether or not the current position of the vehicle is in the vicinity of the intersection, specifically, whether or not the vehicle is within a predetermined distance from the intersection (step S21).

  When the current position is not in the vicinity of the intersection (step S21; No), the system controller 20 does not display (or erases) the logo mark extracted in step S20 on the screen (step S22), and informs the user that the logo is not displayed. And / or the user is notified by displaying a message (step S23). The notification is performed, for example, by outputting a voice or displaying a message such as “Landmarks in the vicinity of the traveling road have been deleted”. In this case, since the vehicle is traveling at a relatively high speed and the logo mark is displayed in the vicinity of the road on which the vehicle is traveling, the road becomes difficult to see.

  On the other hand, when the current position is near the intersection (step S21; Yes), the system controller 20 displays all types of prepared logo marks (step S24). This is because the logo mark may be used as a mark for turning left and right in the vicinity of the intersection, and if deleted, it may hinder the user's driving.

  A display example in which no logo mark is displayed in step S22 is shown in FIG. In the display example 150, as indicated by the current position mark 154 of the vehicle, the vehicle is traveling on the road 151, and among the logo marks existing in the vicinity of the traveling road 151, the logo mark 152 that is not near the intersection (shown by a broken line) ) Is not displayed, but a logo mark 153 (indicated by a solid line) near the intersection is displayed.

  As shown in FIG. 12, while the logo mark is not displayed, the system controller 20 displays the display button 155 on the display screen 150, and when the user presses the display button 155, the display is not displayed until then. The displayed logo mark 152 may be displayed.

[Modification]
In the above example, in order to prevent the road on the map display screen from becoming difficult to see due to the logo mark, the logo mark existing in the vicinity of the current position of the vehicle is extracted in step S20, and is not near the intersection. The logo mark is not displayed (step S22). Instead, based on the number of logo marks extracted in step S20, it is determined whether the logo marks are dense in the vicinity of the current position of the vehicle. Only when it is determined that the logo marks are dense, the process of step S22 is performed. As described above, the logo mark may not be displayed outside the vicinity of the intersection, and the logo mark may be displayed outside the vicinity of the intersection when the area is not crowded. This is because if the logo marks are not dense, it is unlikely that the road will be difficult to see even if they are displayed. The determination as to whether or not the logo marks are dense can be made based on, for example, the range of logo marks extracted in step S20, that is, the number and density of logo marks in a predetermined range from the current position. For example, when the number of logo marks existing per unit area exceeds a predetermined number, it can be determined that the logo marks are dense.

  In step S22, a logo mark present near the road on which the vehicle is traveling is not displayed except near the intersection. Instead, it may be determined whether or not the logo mark extracted in step S20 overlaps with the road when displayed on the display, and only the logo mark existing at the position overlapping with the road may be hidden. This also prevents the road from becoming invisible due to the display of the logo mark on the map displayed on the display.

  In the logo mark display processing example shown in FIG. 9, the process of alternately switching and displaying the overlapping logo marks (step S <b> 17) is performed only while the vehicle is traveling on the highway. A similar process may be executed while traveling on a road other than a highway.

  In the above embodiment, the type of logo mark to be displayed is controlled according to the use frequency, road class and speed band, but the logo mark to be displayed can be changed according to other driving conditions. It does not matter.

  The present invention can be used for a mobile navigation apparatus represented by a vehicle or the like.

Claims (11)

Map display means for displaying a map of a display area including the current position of the vehicle;
Logo mark display means for displaying the logo mark of the facility existing in the display area,
The in-vehicle navigation system, wherein the logo mark display means does not display a logo mark of a facility that is within a predetermined range from the current position of the vehicle and within a predetermined distance from a road on which the vehicle is traveling. apparatus. Map display means for displaying a map of a display area including the current position of the vehicle;
Logo mark display means for displaying the logo mark of the facility existing in the display area,
The logo mark display means does not display a logo mark of a facility that is within a predetermined range from the current position of the vehicle and outside a predetermined distance from an intersection and within a predetermined distance from the road on which the vehicle is traveling. A vehicle-mounted navigation device. The in-vehicle navigation device according to claim 1 or 2 , wherein the logo mark display means determines a type of logo mark to be displayed according to the speed of the vehicle. The in-vehicle use according to any one of claims 1 to 3, wherein the logo mark display means determines a type of logo mark to be displayed according to a type of road on which the vehicle is traveling. Navigation device. The said logo mark display means determines whether the logo mark corresponding to the said facility is displayed according to the frequency with which the said vehicle visited the facility, or any one of Claim 1 to 4 characterized by the above-mentioned. The in-vehicle navigation device described in 1. The said logo mark display means switches and displays the said several logo mark by predetermined time interval, when the display position of several logo mark overlaps, It is any one of Claim 1 to 5 characterized by the above-mentioned. The in-vehicle navigation device described in 1. A map display method executed in an in-vehicle navigation device,
A map display step for displaying a map of a display area including the current position of the vehicle;
A logo mark display step for displaying a logo mark of a facility existing in the display area,
The map display method, wherein the logo mark display step does not display a logo mark of a facility that is within a predetermined range from the current position of the vehicle and within a predetermined distance from the road on which the vehicle is traveling. . A map display method executed in an in-vehicle navigation device,
A map display step for displaying a map of a display area including the current position of the vehicle;
A logo mark display step for displaying a logo mark of a facility existing in the display area,
The logo mark display step does not display a logo mark of a facility that is within a predetermined range from the current position of the vehicle and outside a predetermined distance from an intersection and within a predetermined distance from the road on which the vehicle is traveling. A featured map display method. A map display program that is executed in an in-vehicle navigation device including a computer,
The computer functions as a map display means for displaying a map of a display area including the current position of the vehicle, and a logo mark display means for displaying a logo mark of a facility existing in the display area,
The map display program, wherein the logo mark display means does not display a logo mark of a facility that is within a predetermined range from the current position of the vehicle and within a predetermined distance from a road on which the vehicle is traveling. . A map display program that is executed in an in-vehicle navigation device including a computer,
The computer functions as a map display means for displaying a map of a display area including the current position of the vehicle, and a logo mark display means for displaying a logo mark of a facility existing in the display area,
The logo mark display means does not display a logo mark of a facility that is within a predetermined range from the current position of the vehicle and outside a predetermined distance from an intersection and within a predetermined distance from the road on which the vehicle is traveling. Feature map display program. A recording medium on which the map display program according to claim 9 or 10 is recorded.

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