Electrically-conductive, light-attenuating antireflection coating
First Claim
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1. A coating for an article, comprising:
- three layers, said layers being designated the first, second, and third layers, in numerical order, beginning with the layer furthest from the article;
said first layer including a transparent material having a refractive index less than about 1.52 and having an optical thickness of about one quarter wavelength at a wavelength between about 480 and 560 nm;
said second layer including a transparent material having a refractive index greater than the refractive index of said first layer and having an optical thickness less than the optical thickness of said first layer; and
said third layer including a transition metal nitride and having a thickness between about 5 and 15 nm; and
whereinsaid coating is electrically conductive and light attenuating, and has a photopic reflection less than about 0.25 percent.
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Abstract
A coating for an article comprising layers of nitrides of certain transition metals to provide an electrically-conductive, light-attenuating, antireflection surface.
70 Citations
20 Claims
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1. A coating for an article, comprising:
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three layers, said layers being designated the first, second, and third layers, in numerical order, beginning with the layer furthest from the article; said first layer including a transparent material having a refractive index less than about 1.52 and having an optical thickness of about one quarter wavelength at a wavelength between about 480 and 560 nm; said second layer including a transparent material having a refractive index greater than the refractive index of said first layer and having an optical thickness less than the optical thickness of said first layer; and said third layer including a transition metal nitride and having a thickness between about 5 and 15 nm; and
whereinsaid coating is electrically conductive and light attenuating, and has a photopic reflection less than about 0.25 percent. - View Dependent Claims (2, 3, 4, 5)
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6. A coating for an article, comprising:
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four layers, said layers being designated the first, second, third, and fourth layers in numerical order, beginning with the layer farthest from the article; said first layer having a refractive index less than about 1.52 and having an optical thickness of about one-quarter wavelength at a wavelength between about 480 and 560 nm; said second layer having a refractive index greater than the refractive index of said first layer and having an optical thickness less than the optical thickness of said first layer; said third layer including a first transition metal nitride; said fourth layer including a second transition metal nitride; and said third and fourth layers having a combined thickness between about 5 and 15 nm; and
whereinsaid coating is electrically conductive and light attenuating, and has a photopic reflection less than about 0.25 percent. - View Dependent Claims (7)
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8. A coating for an article, comprising:
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three layers, said layers being designated the first, second and third layers, in numerical order, beginning with the layer furthest from the article; said first layer including silicon dioxide and having a thickness of about 84.0 nanometers; said second layer including titanium dioxide and having a thickness of about 37.5 nanometers; and said third layer including niobium nitride and having a thickness of about 7.8 nanometers; and
whereinsaid coating is electrically conductive and light attenuating, and has a photopic reflection less than about 0.25 percent.
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9. A coated article, comprising:
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a substrate having on a surface thereof a coating including three layers; said layers being designated the first, second and third layers, in numerical order, beginning with the layer furthest from said substrate; said first layer having a refractive index less than about 1.52 and having an optical thickness of about one-quarter wavelength at a wavelength between about 480 and 560 nm; said second layer having a refractive index between about 1.9 and 2.65 and having an optical thickness less than the optical thickness of said first layer; and said third layer including a transition metal nitride and having a thickness between about 5 and 15 nm; and
whereinsaid coating is electrically conductive and light attenuating, and has a photopic reflection less than about 0.25 percent. - View Dependent Claims (10, 11)
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12. A coated article, comprising:
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a substrate having on a surface thereof a coating including four layers; said layers being designated the first, second, third, and fourth layers, in numerical order, beginning with the layer furthest from the substrate; said first layer having a refractive index less than about 1.52 and having an optical thickness of about one-quarter wavelength at a wavelength between about 480 and 560 nm; said second layer having a refractive index greater than the refractive index of said first layer and having an optical thickness less than the optical thickness of said first layer; said third layer including a first transition metal nitride; said fourth layer including a second transition metal nitride; said third and fourth layers having a combined thickness between about 5 and 15 nm; and said first transition metal nitride having a refractive index (n) and an extinction coefficient (k) greater than about 2.0, and said second transition metal nitride having a refractive index (n) an extinction coefficient (k) less than about 2.0. - View Dependent Claims (13, 14, 15)
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16. A coating for an article, comprising:
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four layers, said layers being designated the first, second, third, and fourth layers in numerical order, beginning with the layer farthest from the article; said first layer having a refractive index less than about 1.52 and having an optical thickness of about one-quarter wavelength at a wavelength between about 480 and 560 nanometers; said second layer having a refractive index greater than the refractive index of said first layer and having an optical thickness less than the optical thickness of said first layer; said third layer including a first transition metal nitride having a refractive index greater than about 2.0 and an extinction coefficient greater than about 2.0; said fourth layer including a second transition metal nitride having a refractive index less than about 2.0 and an extinction coefficient less than about 2.0; and said third and fourth layers having a combined thickness between about 5 and 15 nanometers. - View Dependent Claims (17, 18, 19, 20)
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Specification