Field flattener lens element assembly
US4365877A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 6, 1981 |
| Grant date | Dec 28, 1982 |
| Priority date | — |
| Expiry date | Aug 6, 2001 |
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. Wiper elements are provided above and below 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 wiper elements remove debris from the surface. The wiper elements are removable for disposal of collected debris.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.