Mirror mechanism for a film projector
US4148568A · kind A · utility
0Cited by
3References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 18, 1977 |
| Grant date | Apr 10, 1979 |
| Priority date | — |
| Expiry date | Nov 18, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B41/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A mirror mechanism for a continuous-motion cinematograph film projector. A drive shaft is mechanically coupled to the film transport and is coupled through a slipping clutch to drive a cam. A cam follower riding on the cam profile oscillates a compensating mirror. Frame synchronization of the mirror scan is effected by detection of optical synchronizing marks on the film. Release pulses are generated in response to the synchronizing marks to energize a solenoid to release a blocking member which otherwise blocks movement of the cam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.