DIFFUSE REFLECTIVE COATING FOR COLD-MIRROR LAMPS
Publication Date: 2003-Jun-26
The IP.com Prior Art Database
Diffuse reflective coating for cold-mirror lamps
To counteract the occurrence of backlight in “cool-beam” halogen lamps a cold-mirror lamp is disclosed comprising an external, diffuse reflective coating instead of the presently used iron or silicon-iron reflective coating on the outside of the reflector. The diffuse coating can be applied using a sol-gel system. Pigments, e.g. barium sulphate, silver flakes, alumina etc., can be included in said diffuse coating. An interesting aspect is the deposition of said (white) layer on top of another coloured sol-gel layer providing the effect of the lamp being white when turned-off and coloured when turned-on. Experiments have shown a reduction in backlight down to less than 10% of the original amount of backlight of a lamp without said coating.