Aluminium surfaces for technical lighting purposes

Details Aluminium surfaces for technical lighting purposes Aluminium surfaces for technical lighting purposes

G - Physics

02

B

G02B 5/12 (2006.01) C25D 11/04 (2006.01) F21V 7/22 (2006.01) G02B 1/10 (2006.01) G02B 5/08 (2006.01)

Patent

CA 2162423

Reflector for technical lighting purposes, having a reflecting surface of aluminium and a protective, transparent, pore-free barrier layer of aluminium oxide produced by anodising having a dielectric constant .epsilon. of 6 to 10.5 at 20°C, where the barrier layer is of thickness d that either satisfies the condition a) for constructive interference: d~n = k~.lambda./2 ~ 20 nm or b) for achieving a colour-toned reflector surface: [k~.lambda./2 + 20 nm] < d~n < [(k+1)~.lambda./2 - 20 nm] or c) for using as starting material to produce reflectors with LI/HI multi-layer coatings that increase reflectivity. d~n = 1~.lambda./4 ~ 20 nm where n is the refractive index of the barrier layer, .lambda., is the average wave length of the light striking the surface of the reflector, k is a natural number and l is a natural number that is uneven. The thickness of the barrier layer lies between 60 and 490 nm and does not vary by more than ~ 5% over the whole of the aluminium surface.

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