Heat insulating glass with dielectric multilayer coating
US5073451A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1990 |
| Grant date | Dec 17, 1991 |
| Priority date | — |
| Expiry date | Jul 31, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/265
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention provides a heat insulating glass plate with a multilayer coating which is fairly low in transmittance for solar radiation and fairly high in transmittance for the visible light and also for radio waves. The multilayer coating is a lamination of transparent and dielectric layers and has three essential layers in which the middle layer is higher or lower in refractivity than the inner and outer layers. The coating may have five layers in which the second and fourth layers are higher or lower in refractivity than the remaining three layers. Each layer of the multilayer coating is a metal compound film deposited by sputtering or CVD. In a first embodiment of the three-layer coating each of the inner and outer layers is formed of SnO.sub.x, ZrO.sub.x, TaO.sub.x or AlN.sub.x having a refractive index of 1.8-2.1 and the middle layer is formed of TiO.sub.x having a refractive index of 2.2-2.5. In a second embodiment, each of the inner and outer layers is formed of SnO.sub.x, TiO.sub.x, ZrO.sub.x, TaO.sub.x, ZnO.sub.x, AlN.sub.x or SiN.sub.x having a refractive index of 1.8-2.5 and the middle layer is formed of SiO.sub.x, AlO.sub.x or Si.AlO.sub.x having a refractive index of …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.