Aisin Aw Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Denso Corporation

Hiroyoshi Masuda

Mitsuhiro Nimura

Kunihiro Yamada

Akimasa Nanba

Hidenori Nagasaka

Kazuteru Maekawa

Hiroshi Kishi

Toru Ito

Takanori Kaji

Nobuhide Kuroda

Shoji Yokoyama

Tomoki Kodan

Kyomi Morimoto

Shigekazu Ohara

Yumi Shibata

Kyoumi Morimoto

Yasunobu Ito

Kazunori Watanabe

Hironobu Sugimoto

Takayuki Watanabe

Toyoji Hiyokawa

Norihiro Nakamura

Kensuke Takeuchi

Yohei Ando

Yasutaka Atarashi

Kihachi Hayashida

Yusuke Oohashi

Kiyohide Katoh

Koichi Iwatsuki

Tetsuo Kumagai

Hirofumi Morimoto

Shinichi Katoh

Koji Hashimoto

Tomofumi Shibata

Takeshi Yano

Isao Moribe

Yoriyuki Nagata

Akira Ishida

Yoichi Hayama

Minoru Ootake

Toru Sakai

Hideki Nakashima

Hikaru Nagasaka

Yumii Shibata

Yoshihiro Tanabe

Norihisa Fujikawa

Masahiro Takahashi

Masahiro Hyakusawa

Atsushi Yamazaki

Kazuyuki Hirakawa

Tatsumi Sakamoto

Kiyonobu Yamazaki

A navigation device includes a GPS receiver, map data including tunnel data and periodically acquires a vehicle's speed to provide guidance on the current position N acquired at the GPS receiver, and when GPS radio waves become unreceivable after the vehicle passes a tunnel entrance, calculates a travel distance according to a vehicle speed and a time T up to a branch, and continues providing guidance on the current position up to the branch. After passing the branch, the navigation device suspends guidance, calculates a distance La between the branch and a tunnel exit, which is shorter, and when GPS radio waves are not received even after a movement distance from the branch exceeds distance La, after passing the branch, determines a road whose distance is longer as the road being traveled, and provides guidance on the current position.

Terminal device and guidance program

When an update instruction to update 'A' navigation map information and 'B' navigation map information is inputted, a CPU initializes the storage area having stored therein no map information currently in use out of the two storage areas. The CPU then reads, from a CD-ROM, the latest version of the &#x201c;A&#x201d; navigation map information or the &#x201c;B&#x201d; navigation map information that corresponds to the map information currently in use, and stores it in the initialized storage area. The CPU then updates management information, starts use of the newly stored map information, initializes the storage area having stored therein the map information whose use is stopped out of the two storage areas, reads, from the CD-ROM, the latest version of the &#x201c;A&#x201d; navigation map information or the &#x201c;B&#x201d; navigation map information not currently in use, and stores it in the initialized storage area.

Navigation apparatus and map information updating method

A map updating system includes: an update processing unit for performing update processing by reading data required in the update processing from a cache area of a memory when the data are stored in the cache area and from a map database when the data are not stored in the cache area; a cache storage unit for storing the data read by the update processing unit in the cache area; a processing memory capacity determination unit for determining a processing memory capacity, which is a capacity of the memory required as an update processing area, on the basis of the content of map data to be subjected to the update processing; and a cache capacity determination unit for determining a cache capacity, which is a capacity of the memory allocated to the cache area, on the basis of the processing memory capacity.

Map updating system and map updating program using dynamic cache memory

At the first data access by a navigation unit to a recording medium that records updating right information necessary for updating map data in a rewritable data area in which map data are recorded, the updating right information is read from the data area and is deleted from the data area, and a map updating due date created based on the read updating right information is written in a memory of the navigation unit together with the medium identification information read from a non-rewritable management area.

Navigation system

A CPU of a navigation apparatus stores public keys to which priorities are set and which are published by an information distribution center in a public key storage section. The CPU of the navigation apparatus extracts an electronic signature of distribution data which is distributed from the information distribution center and verifies the electronic signature by using only 'valid' public keys among the public keys in order of the priorities. The CPU of the navigation apparatus determines that the distribution data is valid information which is distributed from the information distribution center when the electronic signature passes verification.

Navigation apparatus and information distribution system

A road map display device including a road map information memory for memorizing road map data on a two-dimensional coordinate and a detection device for detecting a present position and a travel direction of an automotive vehicle, wherein the two-dimensional coordinate of the road map data is read out from the information memory in accordance with the present position and travel direction of the vehicle detected by the detection device and displayed in the form of a plane view on a screen of a display unit. In the road map display device, trapezoid conversion parameters are determined on a basis of a conversion formula for converting the two-dimensional coordinate of the road map to a trapezoid coordinate for display of a perspective view in such a manner that an upper side of a square two-dimensional coordinate is contracted relatively to a lower side of the two-dimensional coordinate, and the road map data included in a reverse trapezoid coordinate defined by a reverse conversion formula of the conversion formula are read out from the road map information memory and introduced into a trapezoid coordinate defined by the trapezoid conversion parameters such that the road map data are displayed in the form of a perspective view on the screen of the display unit.

Road map display device and redoce media for use in the same

A vehicle navigation apparatus for searching for a route from an inputted place of departure to an inputted destination and performing guide, the apparatus comprising: a registration unit for associating a traveled route with a place of departure and a destination and thus registering the traveled route; a judgment unit for judging whether the same place of departure and destination as a place of departure and a destination of a registered route are inputted or not; a route search unit for reading out information of the registered route when it is judged by the judgment unit that the same place of departure and destination are inputted, and lowering weighting in searching for the route so as to search for the route; and a control unit for performing guide of the route found by the search by the route search unit. Thus, route guide preferred by a user can be performed.

Vehicle navigation apparatus and program

A map display device using an input unit for inputting a display scale, a memory for storing polygon map data, a drawing processing control unit for drawing a polygon map by loading polygon map data from the memory and a display unit for displaying an output from the drawing processing control unit, wherein the drawing processing control unit is provided with a function for determining a unit of a polygon map that should be drawn and drawing a polygon map of the determined unit.

Map display device, a memory medium and a map display method

An information display system including an input device that inputs a scheduled event, a schedule storage in which the schedule is stored, a display device that displays a map, a memory that stores map information and the scheduled event, and a controller that displays a schedule reminder message on the map at a specified time before the scheduled event is to occur.

Information display system for use with a navigation system

An information center generates packets of route guidance information, each corresponding to a prescribed road length of a recommended route. The information center may generate major guide point information and guidance information and transmit both to a vehicular apparatus. The vehicular apparatus provides guidance only for major guide points based on the received major guide point information if it cannot receive the guidance information. According to another aspect of the invention, if the end of a route segment which was the subject of the preceding route guidance information is on an expressway or toll road, guidance information for a preliminary route from that end to an escape position ahead on the expressway or toll road is first transmitted and then information for a remaining route, that is a segment of the recommended route having the prescribed road length minus the preliminary route, is then transmitted. If communication with the information center is lost, the vehicular apparatus performs guidance for the preliminary route to an interchange, for example, of the expressway using the preliminary route guidance information.

Route guidance system, information delivery center, and vehicular route guidance apparatus

A navigation system for searching coordinates of a telephone number, displaying a map and setting a point, the navigation system comprising a memory for storing information on a subscriber inclusive of coordinates corresponding to a telephone number and map data, an input device for inputting a telephone number, and a control device for searching a subscriber and coordinates based on the input of the telephone number, setting specific coordinates based on the searched coordinates and displaying a map with the specific coordinates located at the center of the map on a condition that the searched subscriber is a specific classified subscriber, wherein a map with a vague point located at the center of the map is displayed while a private home is not directly displayed thereon when the subscriber is a private subscriber of the input telephone number.

A road map display device including a road map information memory for memorizing road map data on a two-dimensional coordinate and a detection device for detecting a present position and a travel direction of an automotive vehicle, wherein the two-dimensional coordinate of the road map data is read out from the information memory in accordance with the present position and travel direction of the vehicle detected by the detection device and displayed in the form of a plane view on a screen of a display unit. In the road map display device, trapezoid conversion parameters are determined on a basis of a conversion formula for converting the two-dimensional coordinate of the road map to a trapezoid, coordinate for display of a perspective view in such a manner that an upper side of a square two-dimensional coordinate is contracted relatively to a lower side of the two-dimensional coordinate, and the road map data included in a reverse trapezoid coordinate defined by a reverse conversion formula of the conversion formula are read out from the road map information memory and introduced into a trapezoid coordinate defined by the trapezoid conversion parameters such that the road map data are displayed in the form of a perspective view on the screen of the display unit.

A map display device is presented including an information memory device for storing map data, a display device for displaying a map based on map data stored in the information memory device, and a display control device, which has a coordinate transformation device for transforming coordinates on a curved plane into coordinates on a projected plane, for controlling the readout of map data from the information memory device and the map display on the display device. The display control device relates coordinates on the map to coordinates on the curved plane with respect to a coordinate transformation reference point, transforms coordinates on the curved plane into coordinates on the projected plane using the coordinate transformation device, and displays a map on the display device by using the coordinates transformed on the projected plane. Therefore, the device enables a driver to obtain the same sense of distance unaffected by the direction by using the present position. A map of the vicinity of the present position is displayed over a wide area.

Map display device and a recording medium

The invention provides a driver with notice of a certain traffic lane change on a road having many traffic lanes even if passing intersections exists within a predetermined distance before a guide intersection. Specifically, the invention concerns a vehicle navigation system for performing a route search on the basis of the input of a point, such as a destination and further performing route guidance along the searched route, which includes an information memory device for storing traffic lane information at intersections, a display for displaying the traffic lane information and a display controller for displaying traffic lane information at intersections on the display on the basis of the traffic lane data stored on the display. The display controller determines whether a passing intersection exists within a predetermined distance before the guidance intersection and controls so as to display lane information of the passing intersections and guidance intersection when the passing intersections exists.

Navigation system and method and storage medium in which navigation programs are stored

Growing community of inventors

Nagoya, Japan

Hiroyoshi Masuda