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Traffic signal head with multiple LED illumination sources
| Details |
Inventors: Lin, Fong-Jei; Zhu, Shengbo;
Assignee:
Primary Examiner: Pham; Toan
Assistant Examiner:
Attorney, Agent or Firm:
A traffic signal head uses a plurality of LED light sources mounted in one or more containment volumes in a housing. One version uses identical three-color LED light sources distributed through the containment volume: each source having a red light generating element, a yellow light generating element, and a green light generating element. A second version uses identical two-color LED light sources distributed through the containment volume, each source having a red LED light generating element and a green LED light generating element. For the second version, activation circuitry enables individual activation of the red LED elements to produce red signals, individual activation of the green LED elements to produce green signals, and concurrent activation of both types of LED elements to produce yellow signals. Both versions can be electrically configured to display any of the three colors, as well as special symbols-such as directional arrows. |
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DETAILED DESCRIPTION The invention comprises a signal head which incorporates multiple LED light sources into one or more light source compartments at lowered cost and with lowered power consumption, while still providing visually distinctive multiple color driver advisory signals and symbols.
In a first apparatus aspect, the invention comprises a traffic signal head having a housing and a plurality of LED light sources mounted in the housing for providing red, yellow, and green driver advisory light signals, with each of the LED light sources comprising a first LED light element having a red light generation characteristic and a second LED light element having a green light generation characteristic.
The traffic signal head includes activation circuitry for enabling individual activation of the first and second LED light elements and concurrent activation of the first and second LED light elements so that individual activation of the first LED light element produces red light, individual activation of the second LED light element produces green light, and concurrent activation of the first and second LED light elements produces yellow light.
Each of the first and second LED light elements has an anode, a cathode, an anode terminal and a cathode terminal, the cathode terminals of the first and second LED light elements being coupled together to a source of electrical power.
The activation circuitry includes first and second power switching devices each having first and second power transfer terminals and a control input terminal.
The first power transfer terminal of the first and second power switching devices is coupled to the source of electrical power.
The second power transfer terminal of the first power switching device is coupled to the anode terminal of the first LED light element.
The second power transfer terminal of the second power switching device is coupled to the anode terminal of the second LED light element.
The control input terminal of the first power switching device is coupled to a source of red control signals, the control input terminal of the second power switching device is coupled to a source of green control signals, and the control input terminals of the first and second power switching devices are coupled to a source of yellow control signals
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