LED symbol signal
View Patent ↗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.
1. A LED Symbol signal, comprising:
at least one Led, mounted on
a printed circuit board, arranged in
a housing with an open end; the open end covered by
a mask with at least one hole defining the symbol and a cover, with a plurality of optical elements substantially covering an inner face of the cover, wherein:
said optical elements have a pitch, and
a ratio of the pitch to a width of the symbol at the inner surface is less than 1:2.
2. The signal of claim 1 , wherein the ratio is less than 1:4.
3. The signal of claim 1 , wherein the ratio is less than 1:4.
4. A LED symbol signal, comprising:
at least on LED, mounted on
a printed circuit bard, arranged in
a housing with an open end, the open end covered by
a mask with at least one hole defining the symbol, and
a cover having an inner face with a diffusion surface, the cover sealing the open end of the housing, wherein a light distribution pattern is symmetrical.
5. A LED symbol signal, comprising:
at least on LED, mounted on
a printed circuit bard, arranged in
a housing with an open end, the open end covered by
a mask with at least one hole defining the symbol, and a cover having an inner face with a diffusion surface, the cover sealing the open end of the housing, wherein a light distribution pattern is asymmetrical about either the horizontal or the vertical axis.
6. A LED symbol signal, comprising:
at least on LED, mounted on
a printed circuit bard, arranged in
a housing with an open end, the open end covered by
a mask with at least one hole defining the symbol, and a cover having an inner face with a diffusion surface, the cover sealing the open end of the housing, wherein:
said optical elements have a pitch and
a ratio of the pitch and a width of the symbol at the diffusion surface is less than 1:2.
7. The signal of claim 6 , wherein the ratio is less than 1:4.
8. The signal of claim 6 , wherein the ratio is approximately 1:10.