Heat rays reflecting film
US4461532A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1982 |
| Grant date | Jul 24, 1984 |
| Priority date | — |
| Expiry date | Apr 28, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/282
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A heat rays reflecting film composed of dielectric thin layers (n.sub.H layers) having a relatively high refractive index and dielectric thin layers (n.sub.L layers) having a relatively low refractive index which are alternately piled on one another, is disclosed. The first layer of the heat rays reflecting film, which contacts with the air is n.sub.L layer and the undermost layer which contacts with the window glass is n.sub.H layer. The optical thickness of the first layer is less than .lambda./4 while that of the other layers is .lambda./4. And the thickness of each layer is expressed by the formula: optical thickness/nv wherein nv is the refractive index for visible rays.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.