Low-glare rear-view mirror for vehicles
An improved low-glare motor-vehicle mirror is realized by providing it with a multilayer coating comprising the following layers, in the order of their deposition: a transparent metallic layer; a first dielectric layer; a second dielectric layer with a lower refractive index than that of the first dielectric layer, and a metallic reflecting layer.
1. A rearview mirror for a vehicle comprising:
a transparent layer carrier; and
a multilayer coating that includes the following layers, in order of their deposition:
a transparent metallic layer;
a first dielectric layer having a first refractive index;
a second dielectric layer having a second refractive index lower than the first refractive index; and
a metallic reflecting layer.
2. The rearview mirror as recited in claim 1 , wherein the rearview mirror has a maximum reflectance with an illuminant of 70%.
3. The rearview mirror as recited in claim 2 , wherein the reflectance is at least 40%.
4. The rearview mirror as recited in claim 2 , wherein the reflectance is at least 50%.
5. The rearview mirror as recited in claim 2 , wherein the reflecting layer includes at least one of Ni, Ti, Cr and an alloy of these materials.
6. The rearview mirror as recited in claim 5 , wherein the reflecting layer includes at least one of Cr and an alloy of Cr.
7. The rearview mirror as recited in claim 1 , wherein the transparent metallic layer includes NiCr and has a thickness of 1 to 21 nm.
8. The rearview mirror as recited in claim 1 , wherein the first dielectric layer includes TiO 2 .
9. The rearview mirror as recited in claim 1 , wherein the first dielectric layer includes SnO 2 .
10. The rearview mirror as recited in claim 1 , wherein the second dielectric layer includes at least one of SnO 2 , MgF 2 and SiO 2 .
11. The rearview mirror as recited in claim 1 , wherein a sum of thicknesses of the first dielectric layer and the second dielectric layer amounts to maximally 250 nm.
12. The rearview mirror as recited in claim 1 , wherein the multilayer coating is disposed on a rear side of the layer carrier.
13. The rearview mirror as recited in claim 12 , further comprising a hydrophilic or photocatalytically active coating disposed on a front side of the layer carrier.
14. The rearview mirror as recited in claim 1 , having a first CIE color coordinate a 0 and a second CIE color coordinate b 0 and wherein √(a 0 2 +b 0 2 )>5.
15. The rearview mirror as recited in claim 1 , wherein the transparent layer carrier includes soda-lime glass.