LED emitter for optical traffic control systems

Details LED emitter for optical traffic control systems LED emitter for optical traffic control systems

2011-07-19

2011-07-19

Nguyen, Tai T (Department: 2612)

Communications: electrical

Visual indication

Using light emitting diodes

C340S815530, C340S870030, C340S003700, C340S003100, C345S031000, C345S082000, C362S249020, C362S253000, C362S362000, C362S373000, C362S545000

Reexamination Certificate

active

07982631

ABSTRACT:
A light emitter for a traffic control preemption system. The emitter includes a plurality of groups of infrared (IR) LEDs and a power source coupled to the groups of LEDs. A plurality of controlled current sources is coupled to the plurality of groups of LEDs, respectively. A controller is configured to trigger an IR light pulse pattern from the groups of LEDs and maintain a first level of IR radiant power from the groups of LEDs using individual control of respective current levels to the groups of LEDs in response to current sense levels from the groups of LEDs. The pulse pattern and first level of IR radiant power activate preemption in the traffic control preemption system.

REFERENCES:
patent: 5172113 (1992-12-01), Hamer
patent: 5187476 (1993-02-01), Hamer
patent: 5661374 (1997-08-01), Cassidy et al.
patent: 6299337 (2001-10-01), Bachl et al.
patent: 7411174 (2008-08-01), Eash
patent: 7429917 (2008-09-01), Fredericks et al.

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