Communications: electrical – Land vehicle alarms or indicators – External alarm or indicator of movement
Patent
1989-01-24
1990-01-16
Crosland, Donnie L.
Communications: electrical
Land vehicle alarms or indicators
External alarm or indicator of movement
340441, 340464, 340479, B60Q 154
Patent
active
048946419
ABSTRACT:
A real-time speed display apparatus for displaying vehicle speed with different colors of light has a speed detector for detecting the speed of revolution of the transmission shaft of a vehicle and outputting a speed signal with its pulse rate varied as a function of the revolution speed. The speed signal is converted into a periodic signal through a timing gate under the control of a clock signal generated by a clock generator. A counter is used to count the number of the pulses within each period of the interval signal, based on which an encoder outputs a corresponding display control signal and transmits it to respective display drivers. Upon receipt of the display control signal, the drivers are started to drive the respective light units. Therefore, different color light is formed on a screen by combination of light emitted by the driven light units.
REFERENCES:
patent: 3550076 (1970-12-01), Kent
patent: 3691525 (1972-09-01), McClellan, Sr. et al.
patent: 3919689 (1975-11-01), Despain
patent: 4647901 (1987-03-01), Teshima et al.
Cotron Corporation
Crosland Donnie L.
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