Vehicle navigational apparatus for displaying a road map
First Claim
1. A navigational apparatus for displaying a road map which has a plurality of pages, comprising:
- command entry means having a plurality of keys associated respectively with equally divided sections of a specified one of the plurality of pages of the road map, said command entry means for specifying a desired page of the map;
memory means for storing road map data which corresponds to the road map to be displayed;
display means; and
processing means responsive to said command entry means, for;
(1) providing information to said display means to provide a display of a page number indication of said specified one page of the road map, (2) addressing said memory means according to said specified one page to read stored data from said memory means corresponding to said one page, (3) passing said stored data to said display means to display said road map, (4) generating, responsive to each of successive operations of said keys of said command entry means, a digit of a multidigit code indicating a location of a desired landmark on said display means, the number of said digits in said multidigit code indicating a size of said landmark, and (5) displaying said landmark on said display means with an intensity which is an inverse function of the number of said digits.
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Accused Products
Abstract
A navigational apparatus for automotive vehicles comprises manually operated command entry keys for specifying a desired page of a road map and specifying one of first and second display scales. Road map data is stored in a memory, the data representing a plurality of nodes along travelling routes that appear on each page of the map and comprising first node data having a first level of significance and second node data having a second level of significance which are addressable in accordance with the specified scale. A data processor reads the stored data from the memory according to the specified page and the specified scale so that the first node data is read when either of the first or second scale is specified and both of the first and second node data are read when the second scale is specified. The processor converts the storage location of the read data to a coordinate location of the memory to cause a display to provide a road map.
75 Citations
25 Claims
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1. A navigational apparatus for displaying a road map which has a plurality of pages, comprising:
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command entry means having a plurality of keys associated respectively with equally divided sections of a specified one of the plurality of pages of the road map, said command entry means for specifying a desired page of the map; memory means for storing road map data which corresponds to the road map to be displayed; display means; and processing means responsive to said command entry means, for;
(1) providing information to said display means to provide a display of a page number indication of said specified one page of the road map, (2) addressing said memory means according to said specified one page to read stored data from said memory means corresponding to said one page, (3) passing said stored data to said display means to display said road map, (4) generating, responsive to each of successive operations of said keys of said command entry means, a digit of a multidigit code indicating a location of a desired landmark on said display means, the number of said digits in said multidigit code indicating a size of said landmark, and (5) displaying said landmark on said display means with an intensity which is an inverse function of the number of said digits. - View Dependent Claims (2, 3)
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4. A navigational apparatus for displaying a road map, which has a plurality of pages comprising:
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manually operated command entry means including a command entry key, for specifying a desired page of the road map; memory means for storing road map data which corresponds to the road map to be displayed; displaying means; processing means, responsive to said command and entry means, for;
(1) providing information to said display means to provide a display of a page number indication of said desired page of the road map, (2) addressing said memory means according to said desired page to read stored data from said memory means corresponding to said desired page, and (3) passing the stored data to said display means to display said road map; andsecond memory means for storing predetermined node data, wherein said processing means is also for addressing a first predetermined data stored in said second memory means, converting a storage location of said first predetermined data to a first coordinate address indicative of a first location on said display means, intensifying a display illuminated of a first landmark on said display means at said first location, addressing a second predetermined data stored in said second memory means in response to operation of said command key, converting a storage location of said second data to a second coordinate address indicative of a second location in said second memory means, and intensifying a display illumination of a second landmark of said display means at said second location while removing display of said first landmark at said first location.
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5. A navigational apparatus for displaying a road map including a plurality of pages on a display means, comprising:
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command entry means for specifying a desired page of the map and specifying a specified scale as one of first and second display scales; memory means for storing road map data representing a plurality of nodes along a plurality of routes on each of said pages, said data comprising first node data having a first level of significance and second node data having a second level of significance, said first and second node data being addressable according to said display scales specified by said command entry means; and processing means for reading stored data from said memory means according to the desired page and the specified scale so that the first node data is read when said first scale is specified and the first and second node data are read when the second scale is specified and for converting the storage location of the read data to a coordinate address indicative of a location of said memory means, to cause said display means to provide display of said road map. - View Dependent Claims (6, 7)
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8. A navigational apparatus for displaying a road map including a plurality of pages on display means, comprising:
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command entry means for specifying a first display mode indicating that a whole area of a desired page of said map is to be displayed and a second display mode indicating that a desired one of equally divided adjoining sections of said desired page is to be displayed; memory means for storing data representing a plurality of nodes along a plurality of routes for each of said pages, the node representing data of each page comprising first and second node data indicating whether the node is of a first or second level of significance; and data processing means for addressing said memory means according to the specified display mode for reading the first node data when said first display mode is specified or reading both the first nd second node data when said second display mode is specified, converting storage locations of the data read out of said memory means to first coordinate addresses representing first locations on said display means, and deriving second coordinate addresses that indicate locations which delineate a line between successive ones of the first coordinate addresses to cause said display means to provide display of said road map. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification