Dichromatic mirror

Details Dichromatic mirror Dichromatic mirror

G - Physics

02

B

G02B 5/08 (2006.01) B60R 1/12 (2006.01) G02B 27/14 (2006.01)

Patent

CA 2232649

A dichromatic mirror, particularly suitable for use in a road vehicle rear- view mirror incorporating a warning light, comprises a vitreous substrate and a three- layer coating stack including a layer formed of a high refractive index semi- conductor material such as silicon, and two other layers formed of materials different from each other and from the semi-conductor layer, one of said other layers having a refractive index of intermediate value relative to that of the semi-conductor material and the third layer having a refractive index of low value relative to that of the semi- conductor material, the said two other materials being selected from magnesium fluoride, silicon oxides, tin oxides, titanium oxide, niobium oxide, aluminium nitride, silicon nitride, and mixtures thereof. The mirror has a luminous transmittance of at least 20% and a reflectivity of at least 40%.

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