US5774830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Car navigation system
Assignee: Panasonic Holdings Corp
•
Filing: 1996-01-17
•
Granted: 1998-06-30
•
Expires: 2016-01-17
Abstract
Abstract A navigation system includes a GPS receiver. Detection is made as to a number of GPS radio signals received by the GPS receiver. A display is operative for indicating a picture. At least one of a color tone and a luminance of the picture indicated by the display is controlled in response to the detected GPS radio signal number. Calculation may be made as to a rate of a decrease in the GPS radio signal number. In this case, at least one of the color tone and the luminance of the picture indicated by the display is controlled in response to the calculated decrease rate.
Inventors
- 👤 Hiroaki Tsuji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:42
CPC Classifications
G; G01; G01S; G01S19/00; G01S19/01; G01S19/13; B; B60; B60Q; B60Q3/00; B60Q3/10; B60Q3/16; B60Q3/18; G01C; G01C21/00; G01C21/26; G01C21/34; G01C21/36
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
94 words
A navigation system comprising: a GPS receiver; first means for detecting a number of GPS radio signals received by the GPS receiver; second means connected to the first means for calculating a rate of a decrease in the GPS radio signal number detected by the first means; a display for indicating a picture; and third means connected to the second means and the display for controlling at least one of a color tone and a luminance of the picture indicated by the display in response to the decrease rate calculated by the second means.
Claim 2
Dependent Claim
94 words
A navigation system comprising: a GPS receiver; first means for detecting a number of GPS radio signals received by the GPS receiver; second means connected to the first means for calculating a rate of a decrease in the GPS radio signal number detected by the first means; a display for indicating a picture; and third means connected to the second means and the display for controlling at least one of a color tone and a luminance of the picture indicated by the display in response to the decrease rate calculated by the second means.
Claim 3
Dependent Claim
146 words
A navigation system for a vehicle, comprising: a GPS receiver; first means for detecting a number of GPS radio signals received by the GPS receiver; a display for indicating a picture; second means connected to the first means and the display for controlling a color tone of the picture indicated by the display in response to a rate of decrease in the GPS signal number based on the GPS radio signal number detected by the first means; third means for deciding whether or not a present time at a present position of the vehicle is in a prescribed time interval corresponding to a nighttime; and fourth means connected to the third means and the display for controlling at least one of the color tone and the luminance of the picture indicated by the display in response to a result of said deciding by the third means.
Claim 4
Dependent Claim
146 words
A navigation system for a vehicle, comprising: a GPS receiver; first means for detecting a number of GPS radio signals received by the GPS receiver; a display for indicating a picture; second means connected to the first means and the display for controlling a color tone of the picture indicated by the display in response to a rate of decrease in the GPS signal number based on the GPS radio signal number detected by the first means; third means for deciding whether or not a present time at a present position of the vehicle is in a prescribed time interval corresponding to a nighttime; and fourth means connected to the third means and the display for controlling at least one of the color tone and the luminance of the picture indicated by the display in response to a result of said deciding by the third means.
Claim 5
Dependent Claim
162 words
A navigation system comprising: a GPS receiver; first means for detecting a number of GPS radio signals received by the GPS receiver; second means connected to the first means for calculating a rate of a decrease in the GPS radio signal number detected by the first means; a display for indicating a picture; third means connected to the second means and the display for controlling at least one of a color tone and a luminance of the picture indicated by the display in response to the decrease rate calculated by the second means; fourth means for deciding whether or not a present time at a present position of the vehicle is in a prescribed time interval corresponding to a nighttime; and fifth means connected to the fourth means and the display for controlling at least one of the color tone and the luminance of the picture indicated by the display in response to a result of said deciding by the fourth means.
Claim 6
Dependent Claim
162 words
A navigation system comprising: a GPS receiver; first means for detecting a number of GPS radio signals received by the GPS receiver; second means connected to the first means for calculating a rate of a decrease in the GPS radio signal number detected by the first means; a display for indicating a picture; third means connected to the second means and the display for controlling at least one of a color tone and a luminance of the picture indicated by the display in response to the decrease rate calculated by the second means; fourth means for deciding whether or not a present time at a present position of the vehicle is in a prescribed time interval corresponding to a nighttime; and fifth means connected to the fourth means and the display for controlling at least one of the color tone and the luminance of the picture indicated by the display in response to a result of said deciding by the fourth means.
References Cited (Backward Citations)
US4731613A
Cited
US4965574A
Cited
US4807157A
Cited
US5598339A
Cited
JPH0518767A
Cited
EP0523918A1
Cited
WO1994016504A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-06-29 | 2001-12-29 | 2002-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-06-29 | 2005-12-29 | 2006-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-06-29 | 2009-12-29 | 2010-06-30 | $7700.00 | Window Closed / Lapsed |