Coating, composed of an optically effective layer system, for substrates, whereby the layer system has a high anti-reflective effect, and method for manufacturing the coating
First Claim
1. A coating for a front side of a substrate, which side faces an observer, said coating being composed of an optically effective layer system, said layer system having a high anti-reflective effect, said layer system being composed of four layers with a first layer with a layer thickness of 100Å
- ±
10% being arranged on the front side of the substrate and comprising a highly refractive material, a second layer of the four layers being arranged on the first layer, said second layer having a thickness of 400Å
±
5% and comprising a low-refracting material, a third layer of the four layers being arranged on the second layer, said third layer having a thickness of 1040Å
±
2% and comprising a highly refractive material, and the fourth layer of the four layers being arranged on the third layer, said fourth layer having a thickness of 940Å
±
2% and comprising a low-refracting material.
2 Assignments
0 Petitions
Accused Products
Abstract
A coating for applying to a front side of a substrate, which side is facing an observer, comprises a four-layer system which is optically effective and has a high anti-reflective effect. A first layer of this system is applied onto the front side of the substrate and is, preferably, a highly-refracting TiO2 layer, the second layer is applied to the first layer and is a low-refracting Al2 O3 layer, a third layer of the system is applied to the second layer and is, preferably, a high-refracting TiO2, while the fourth layer applied to the third layer is, preferably, a low-refracting SiO2 layer. The layers can be formed by either a pyrolytic method, a plasma-supported chemical vapor deposition method, a sputtering method or a chemical vapor deposition method. Preferably, they are formed by a DC-reactive sputtering method with a magnetron.
69 Citations
20 Claims
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1. A coating for a front side of a substrate, which side faces an observer, said coating being composed of an optically effective layer system, said layer system having a high anti-reflective effect, said layer system being composed of four layers with a first layer with a layer thickness of 100Å
- ±
10% being arranged on the front side of the substrate and comprising a highly refractive material, a second layer of the four layers being arranged on the first layer, said second layer having a thickness of 400Å
±
5% and comprising a low-refracting material, a third layer of the four layers being arranged on the second layer, said third layer having a thickness of 1040Å
±
2% and comprising a highly refractive material, and the fourth layer of the four layers being arranged on the third layer, said fourth layer having a thickness of 940Å
±
2% and comprising a low-refracting material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- ±
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9. A coating for a front surface of a substrate when viewed by an observer, said coating being composed of an optically effective layer system, said layer system having a high anti-reflective effect and being composed of four layers, a first layer of the four layers being arranged next to the front surface of the substrate and being highly refracting, said first layer being a TiO2 layer with a thickness of 100 angstrom ±
- 10%, a second layer of the four layers being arranged on the first layer and being a low-refracting material, said second layer being an Al2 O3 layer with a thickness of 400 angstrom ±
5%, a third layer of the four layers being arranged on said second layer and comprising a highly refractive material, said third layer being a TiO2 layer with a layer thickness of 1040 angstrom ±
2%, a fourth layer of the four layers being arranged on the third layer and being a low-refracting material, said fourth layer being an SiO2 layer with a layer thickness of 940 angstrom ±
2%.
- 10%, a second layer of the four layers being arranged on the first layer and being a low-refracting material, said second layer being an Al2 O3 layer with a thickness of 400 angstrom ±
-
10. A coating for a front surface of a substrate, which surface faces an observer, said coating being composed of an optically effective layer system, said layer system having a high anti-reflective effect for a visible range of light having a wavelength λ
- , said layer system being composed of four layers with each layer having an optical density being defined by the refractive index (n) times an actual layer thickness (d), a first layer of the four layers being arranged on the front side of the substrate and comprising a highly refractive material with n1 being between 1.8 and 2.56 and the optical density of n1 ×
d1 being approximately equal to 0.05λ
, a second layer of the four layers being arranged on the first layer and comprising a low-refracting material with n2 being between 1.55 and 1.75 and the optical density n2 ×
d2 being approximately equal to 0.12λ
, a third layer of the four layers being arranged on the second layer and comprising a highly reflective material with n3 being between 1.8 and 2.58 and the optical density n3 ×
d3 being approximately equal to 0.5λ
, and a fourth layer of the four layers being arranged on the third layer and comprising a low-refracting material with n4 being between 1.3 and 1.63 and the optical density n4 ×
d4 being approximately equal to 0.25λ
. - View Dependent Claims (11, 12)
- , said layer system being composed of four layers with each layer having an optical density being defined by the refractive index (n) times an actual layer thickness (d), a first layer of the four layers being arranged on the front side of the substrate and comprising a highly refractive material with n1 being between 1.8 and 2.56 and the optical density of n1 ×
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13. A method for manufacturing a coating comprising a layer system of four layers on a substrate, said system having a first layer with a thickness of 100 angstrom ±
- 10%, a second layer with a thickness of 400 angstrom ±
5%, a third layer with a thickness of 1040 angstrom ±
2%, a fourth layer with a thickness of 940 angstrom ±
2%, and the values of the respective layer thickness being selected within a cited layer thickness tolerance that takes into consideration the interdependencies between the individual layer thicknesses and the material being used for each layer, said method comprising providing the substrate and forming the four-layer system directly on said substrate by applying the first layer on the substrate followed by the second, third and fourth layers by a method selected from a group consisting of a vacuum-metallization method, a chemical vapor deposition method, a plasma-supported chemical deposition method, a pyrolytic method, and a DC-reactive sputtering method from a target with a magnetron. - View Dependent Claims (14, 15, 16, 17, 18)
- 10%, a second layer with a thickness of 400 angstrom ±
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19. A method for manufacturing a coating comprising a layer system of four layers on a substrate, said method comprising providing the substrate, forming the four-layer system directly on said substrate by applying the first layer on the substrate followed by the second, third and fourth layers by a method selected from a group consisting of a vacuum-metallization method, a chemical vapor deposition method, a plasma-supported chemical deposition method, a pyrolytic method, and a DC-reactive sputtering method from a target with a magnetron, and selecting the refractive index n and the thickness d of each layer to provide a desired optical density, n×
- d, with the materials of the first layer having n1 being between 1.8 and 2.56 and n1 ×
d1 being approximately equal to 0.05λ
for visible light, the second layer having n2 being in a range of 1.55 to 1.75 and n2 ×
d2 being approximately equal to 0.12λ
, the third layer having n3 being in a range of 1.8 to 2.56 and n3 ×
d3 being approximately equal to 0.5λ and
the fourth layer having n4 in a range of 1.3 to 1.63 and n4 ×
d4 being approximately equal to 0.25λ
. - View Dependent Claims (20)
- d, with the materials of the first layer having n1 being between 1.8 and 2.56 and n1 ×
Specification