Polymeric film base carrying fluoropolymer anti-reflection coating
US4046457A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 6, 1975 |
| Grant date | Sep 6, 1977 |
| Priority date | — |
| Expiry date | Aug 6, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/261
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Transparent elements useful as supports for photographic image-carrying and/or image-recording layers are provided comprising a polymeric film base having an anti-reflection coating on one surface. Image-carrying and/or image-recording layers may be coated on the opposed surface. Such transparent supports are particularly useful in photographic products wherein the final image is formed by multicolor diffusion transfer processes using dye developers or other image dye-providing materials. In the preferred embodiments, the photographic image is an integral negative-positive reflection print. Where photoexposure is effected through a transparent support, e.g., the transparent support through which the final image is viewed, provision of an anti-reflection coating on said support and effecting photoexposure therethrough will permit more effective recording of light passing through the camera lens. The polymeric film base of the transparent element has an index of refraction of at least 1.6, and the anti-reflection coating comprises a fluorinated polymer and has an optical thickness of a quarter wave.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.