LED symbol signal

Details LED symbol signal LED symbol signal

2007-02-13

2007-02-13

O'Shea, Sandra (Department: 2875)

Illumination

Plural light sources

With modifier

C362S254000, C362S247000

Reexamination Certificate

active

11043562

ABSTRACT:
A LED symbol signal with LEDs arrayed to correspond to a desired symbol. A mask defines the desired symbol. A diffusion surface on the cover diffuses the display aspect, obscuring the individual LEDs. The mask is spaced a distance from the diffusing surface. The more aggressive the diffusion pattern the closer the mask is spaced to the diffusion pattern. Preferably, the ratio of the pitch of the optical elements to the width of the symbol at the diffusion surface is less than 1:2, preferably less than 1:4, more preferably less than 1:6 and most preferably approximately 1:10.

REFERENCES:
patent: 1945190 (1934-01-01), Handlan
patent: 3678458 (1972-07-01), Ljungkull et al.
patent: 5577831 (1996-11-01), Chang
patent: 5687500 (1997-11-01), Lamparter
patent: 5778579 (1998-07-01), Yuen
patent: 6036336 (2000-03-01), Wu
patent: 6249375 (2001-06-01), Silhengst et al.
patent: 6955449 (2005-10-01), Martineau

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