3-D motion picture projector
US4966454A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 8, 1989 |
| Grant date | Oct 30, 1990 |
| Priority date | — |
| Expiry date | Sep 8, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B35/20
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A 3-D motion picture projector comprises two rolling loop film transport mechanisms arranged in vertically superposed relationship with the pricipal components of the two mechanisms in vertical alignment with one another. Each film transport mechanism includes a cam unit for decelerating the film as it approaches the aperture for projection. The two cam units are driven from a common vertical drive shaft by toothed belt drives. The lower cam unit is mounted on an arm so that it can be swung out to an inoperative position for maintenance and service. The belt drives maintain the drive coupling at this time and automatically restore proper cam timing when the cam unit is returned to its operative position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.