Film transport mechanism
US5587750A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 1996 |
| Grant date | Dec 24, 1996 |
| Priority date | — |
| Expiry date | May 8, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B1/42
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A compact rolling loop motion picture projector has a rotor of significantly smaller diameter than a conventional such rotor. The radius of curvature of the rotor is selected to be significantly less than the radius of curvature of a film flattener element on which the film is located for projection, and the axis of rotation of the rotor is offset towards a film input sprocket of the projector so as to maintain a minimum film gap between the rotor and the field flattener upstream of the optical axis of the projector. The compact rotor is rotationally supported from above by a "spider" and a projection lamp is located below the rotor for compactness and efficiency of lamp operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.