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US 12,681,214 B2Granted
Visible spectrum anti-reflective coatings with reduced reflections in ultraviolet and infrared spectral bands
AssigneeI-Coat Company, LLC
InventorsHamlet Joe Avetisian, Sr., Timothy George Stephan, Arman Bernardi
Life of this patent
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Abstract
Lens coatings and coated lenses which offer full-spectrum protection by reducing back-side reflection of all light spanning from the ultraviolet sub-band B (UVB) to infrared (IR-A) region are provided. The full-spectrum back-side anti-reflective coatings disclosed herein are comprised of multiple thin-film layers of high refractive index (HighIndex) and low refractive index (LowIndex) materials. In many embodiments, the penultimate layer distal from the substrate lens is a HighIndex layer, and the final layer distal from the substrate lens is a LowIndex layer.
Claims30
An optical lens comprising:
- a substrate lens having a frontside and a backside;
- an antireflective coating (AR) disposed one of either adjacent to or distal from the backside of the substrate lens, the AR coating formed of at least three thin-film layers each formed of one of either a high refractive index (HighIndex) metal oxide material or a low refractive index (LowIndex) material, wherein the HighIndex metal oxide material has a refractive index of at least 1.6 and the LowIndex material has a refractive index of no greater than 1.5;
- wherein the at least three thin-film layers form a coating stack having an innermost end configured to be disposed atop the backside of the substrate lens, and an outermost end configured to be disposed distal to the backside of the substrate lens, and wherein the coating stack comprising at least a final layer formed from a LowIndex material having a thickness of from 90-110 nm and disposed distal to the backside, and a final layer of a HighIndex material having a thickness of from 50-70 nm and disposed distal to the backside;
- and
- wherein a backside mean reflectance factor Rm of the coating measured across wavelengths 400-700 nm does not exceed 2.15%, a backside mean UV reflection factor RUV of the coating measured across wavelengths 280-380 nm does not exceed 13% measured at angles of incidence 30° and 45°, and a backside IR reflection factor RIR of the coating measured across 780-1400 nm does not exceed 14% measured at angles of incidence 30° or 45°.
2 more elements
A method of coating an optical lens with an antireflective coating comprising:
- providing a substrate lens having a frontside and a backside;
- disposing an antireflective (AR) coating on the substrate lens, the AR coating formed of at least three thin- film layers each formed of one of either a high refractive index (HighIndex) metal oxide material or a low refractive index (LowIndex) material, wherein the HighIndex metal oxide material has a refractive index of at least 1.6 and the LowIndex material has a refractive index of no greater than 1.5;
- wherein the at least three thin-film layers form a coating stack disposed atop the backside of the substrate lens, the coating stack comprising, a final layer of a LowIndex material having a thickness of from 97-105 nm disposed distal to the backside, and a final layer of a HighIndex material having a thickness of from 55-65 nm and disposed distal to the backside;
- and
- wherein a backside mean reflectance factor Rm of the coating measured across wavelengths 400-700 nm does not exceed 2.15%, a backside mean UV reflection factor RUV of the coating measured across wavelengths 280-380 nm does not exceed 13% measured at angles of incidence 30° and 45°, and a backside IR reflection factor RIR of the coating measured across 780-1400 nm does not exceed 14% measured at angles of incidence 30° or 45°.
2 more elements
A method of coating an optical lens with an antireflective coating comprising:
- providing a substrate lens having a frontside and a backside;
- disposing an antireflective (AR) coating on the substrate lens, the AR coating formed of at least three thin-film layers each formed of one of either a high refractive index (HighIndex) metal oxide material or a low refractive index (LowIndex) material, wherein the HighIndex metal oxide material has a refractive index of at least 1.6 and the LowIndex material has a refractive index of no greater than 1.5;
- wherein the at least three thin-film layers form a coating stack disposed atop the backside of the substrate lens, the coating stack comprising, a final layer of a LowIndex material having a thickness of from 99-105 nm disposed distal to the backside, and a final layer of a HighIndex material having a thickness of from 58-65 nm and disposed distal to the backside;
- and
- wherein a backside mean reflectance factor Rm of the coating measured across wavelengths 400-700 nm does not exceed 2.15%, a backside mean UV reflection factor RUV of the coating measured across wavelengths 280-380 nm does not exceed 13% measured at angles of incidence 30° and 45°, and a backside IR reflection factor RIR of the coating measured across 780-1400 nm does not exceed 14% measured at angles of incidence 30° or 45°.
2 more elements
Dependencies are inferred from the claim text.