Film support element assembly
US4441796A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 12, 1982 |
| Grant date | Apr 10, 1984 |
| Priority date | — |
| Expiry date | Aug 12, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B1/42
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A film support element assembly is disclosed, primarily for supporting film in relation to a projection aperture in a motion picture projector having a rolling loop film transport mechanism. In a preferred embodiment the film support element is a so-called "field flattener" and has a cylindrically curved surface over which successive frames in the film are laid by the mechanism. Cleaning means are provided adjacent the film path and the lens element can be displaced to bring a fresh portion of the surface into the film path. At the same time, the cleaning means remove debris from the surface. In one embodiment the lens element is vibrated to discourage adhesion of debris.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.