Dielectric mirror
AssigneeGuardian Europe S.A.R.L.
InventorGyorgy VIKOR
Life of this patent
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Abstract
A dielectric mirror includes a coating having alternating high and low index layers. The mirror coating has no metallic reflective layer of Al or Ag in certain example embodiments, and may have film side and/or glass side visible reflection of from about 50-90% (more preferably from about 60-80% and most preferably from about 65-75%) and visible transmission of from about 10-50% (more preferably from about 10-40% or 20-40%) in certain example embodiments.
Claims45
A dielectric mirror including a glass substrate supporting a coating, the coating comprising moving away from the glass substrate:
- a first transparent dielectric high refractive index layer comprising niobium oxide and/or titanium oxide, the first transparent dielectric high refractive index layer having a thickness of from about 70-140 nm;
- a second transparent dielectric low refractive index layer comprising silicon oxide, the second transparent dielectric low refractive index layer having a thickness of from about 30-140 nm;
- a third transparent dielectric high refractive index layer comprising niobium oxide and/or titanium oxide;
- a fourth transparent dielectric low refractive index layer comprising silicon oxide;
- a fifth transparent dielectric high refractive index layer comprising niobium oxide and/or titanium oxide;
- wherein the first transparent dielectric high index layer comprising niobium oxide and/or titanium oxide is at least 10 nm thicker than one or both of (a) the third transparent dielectric high refractive index layer comprising niobium oxide and/or titanium oxide, and/or (b) the fifth transparent dielectric high index layer comprising niobium oxide and/or titanium oxide;
- wherein the coating does not contain any metallic reflective layer based on Al or Ag;
- and
- wherein the dielectric mirror has (i) a film side visible reflectance or a glass side visible reflectance of from about 50-90%, and (ii) a visible transmission of from about 10-40%, and
- wherein the glass side visible reflectance of the mirror is at least about 30% higher or at least about 30% lower than is the film side visible reflectance of the mirror.
A dielectric mirror including a substrate supporting a coating, the coating comprising moving away from the substrate:
- a first dielectric layer having a thickness of from about 70-140 nm and a refractive index (n) of from about 2.15 to 2.5;
- a second dielectric layer comprising silicon oxide;
- a third dielectric layer having a refractive index of from about 2.15 to 2.5;
- a fourth dielectric layer comprising silicon oxide;
- a fifth dielectric layer having a refractive index of from about 2.15 to 2.5;
- wherein the first dielectric layer is at least 10 nm thicker than one or both of the third dielectric layer and/or the fifth dielectric layer;
- wherein the coating does not contain any metallic reflective layer;
- and
- wherein the mirror has a visible film side reflectance and/or a visible glass side reflectance of from about 50-90%, and visible transmission of from about 10-50%.
A dielectric mirror including a substrate supporting a coating, the coating comprising moving away from the substrate:
- a first dielectric layer having a refractive index (n) of from about 2.15 to 2.5;
- a second dielectric layer comprising silicon oxide;
- a third dielectric layer having a refractive index of from about 2.15 to 2.5;
- a fourth dielectric layer comprising silicon oxide;
- a fifth dielectric layer having a refractive index of from about 2.15 to 2.5;
- wherein the first dielectric layer is at least 20 nm thinner than one or both of the third dielectric layer and/or the fifth dielectric layer;
- and
- wherein the coating does not contain any metallic reflective layer.
Dependencies are inferred from the claim text.