LED symbol signal

Details LED symbol signal LED symbol signal

2005-03-22

2005-03-22

O'Shea, Sandra (Department: 2875)

Illumination

Plural light sources

With modifier

C362S244000, C340S815450

Reexamination Certificate

active

06869203

ABSTRACT:
A LED symbol signal with LEDs arrayed to correspond to a desired symbol. Light from the LEDs is directed onto corresponding optical segments of a multiple collimating zone element and directed into a forward direction/distribution. A mask defines the desired symbol. The optical segments and or a diffusion surface on the cover or multiple collimating zone element(s) diffuses the display aspect, obscuring the individual LEDs. A diameter of the optical features of the diffusion surface is smaller than a diameter of the optical segments. The LED symbol signal may be configured for retrofitting into an incandescent lamp signal housing.

REFERENCES:
patent: 3678458 (1972-07-01), Ljungkull et al.
patent: 5687500 (1997-11-01), Lamparter

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