H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 43/00 (2006.01) G09F 13/00 (2006.01) H01L 33/00 (2006.01)
Patent
CA 2142132
Methods and apparatus useful for sign illumination such as for retrofitting of standard exit signage and the like, the invention provides lamp structures having light emitting diodes as the illumination source. The lamp is fitted with any one of the common lamp bases and is intended as a retrofit for incandescent lamps having such bases in illuminated signs such as exit signs and the like. The invention contemplates the packaging of a number of light emitting diodes in a circuit usually having a current limiting device to allow LED operation at a desired current level. The light emitting diodes are placed within a standard glass or plastic bulb envelope in arrangements capable of providing even illumination from the lamp. The invention also encompasses methods for fabrication of LED structural arrangements as well as the structural arrangements per se which with associated circuitry are disposed interiorly of the lamp structures. In one embodiment, a particularly bright light emitting diode is disposed at the distal end of a lamp structure for providing "downlight". The lamp structures are fitted with any one of the common lamp bases and are particularly useful as retrofits for incandescent lamps having such bases in illuminated signs. One or more of the LED lamp structures can be provided in a kit with a diffusing panel coated with an ink matched to the wavelength or wavelength range of the light emitting diodes, the kit being used to retrofit an exit sign or the like to provide a sign including in combination LED lamp structure or structures and a diffusing panel interactive with the light emitting diodes.
Mccarthy Tetrault Llp
Nsi Enterprises Inc.
LandOfFree
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