Continuous motion picture projector apparatus
US3937567A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Mar 29, 1974 |
| Grant date | Feb 10, 1976 |
| Priority date | — |
| Expiry date | Mar 29, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B31/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A continuous motion picture projection apparatus for use with a film strip having two side by side data tracks each comprising a photographic image track and a synchronized sound track. The first half of the program is carried by one data track and the other half by the second data track. The apparatus includes a main drive assembly which moves the film strip through the unit alternately in a forward and reverse direction and further comprises an illumination system, a projection lens system and a sound track sensor system. These systems are movable between a first position in alignment with the first data track and a second position in alignment with the second data track. Mechanisms associated with each of the systems are operably coupled with the main drive assembly and serve to automatically move the systems between their first and second positions upon reversal of the drive assembly. A reversing mechanism is provided to sense a specific location near either end of the film strip and thereupon to reverse the drive assembly. Reversal of the drive assembly reverses the direction of travel of the film strip and simultaneously causes the illumination, projection lens and sound trac…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.