Communications: electrical – Selective – Having indication or alarm
Patent
1983-11-07
1987-03-24
Rowland, James L.
Communications: electrical
Selective
Having indication or alarm
116 63R, 350330, 350331R, 340 74, 340 84, 340 94, 340111, G08G 100
Patent
active
046528512
ABSTRACT:
An improved traffic signal lamp control system utilizes continuously burning lamps, such as fluorescent lamps or HID lamps, located inside a traffic signal housing or external to the housing to direct light toward the lens apertures of the housing. A light attentuation device, which may be either a mechanical shutter or a liquid crystal panel is placed in the path of light between the continuously energized lamp and the aperture of the housing to either block the passage of light from the lamp through the aperture or permit the passage of light therethrough. The conventional red, amber and green lenses are placed in the apertures, and the conventional traffic signal light control signals are used to operate the attentuation device. Substantial savings in power consumption are encountered since fluorescent lamps and HID lamps consume much less power than incandescent lamps, and considerably increased lamp life can be achieved. When a liquid crystal shutter is used for the attenuation device, the switching is accomplished by low-voltage switching.
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Ptak LaValle D.
Rittmaster T.
Rowland James L.
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