Method for making transparent reflective films
US5695808A · kind A · utility
12Cited by
40References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 3, 1996 |
| Grant date | Dec 9, 1997 |
| Priority date | — |
| Expiry date | May 3, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2250/36
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method for making transparent, reflective films includes coating a polymer film with ZnS by charging a set of carbon crucibles with ZnS cubes or pellets. The crucibles are heated by induction in a vacuum deposition chamber having a supply roll of the polymer film and a take-up roll. The ZnS cubes sublimate at a rate matched to web advance to insure a coating thickness for colorless films of at least 1,000 angstroms. The thickness of the ZnS layer on the film is monitored by visual observation of color by a source of visible white light and the rate of transfer of the film is adjusted to control the thickness of the ZnS layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.