Sound motion picture projection system

Optics: motion pictures – With sound accompaniment – Picture and sound synchronizing

Patent

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Details

352 27, G03B 3100

Patent

active

041791975

ABSTRACT:
A sound motion picture projection system which can be formed by a combination of a silent film projector and a sound recording and reproducing unit, wherein a silent film projector and a separate sound recording and reproducing unit are provided and minor modification is given to said silent film projector so that said silent film projector can be used as a projection unit only with said minor modification.
And especially in this system when said sound unit is attached to said projection unit and continuous film advancing means provided at said sound unit is connected with a driving motor provided at said projection unit through a power transmission mechanism, and at a same time an intermittent film advancing means provided at a projection unit is connected with a part of said power transmission mechanism through a power transmission mechanism of variable speed type, further an output member of a loop sensing means provided at the sound unit is connected with said variable speed power transmission mechanism, so that an operating speed of the intermittent film advancing means at the projection unit is controlled depending on the change in an amount of film loop formed between a projection station of the projection unit and a sound recording and a reproducing station of the sound unit.

REFERENCES:
patent: 3048081 (1962-08-01), Biedermann et al.
patent: 3224828 (1965-12-01), Chytil
patent: 3244469 (1966-04-01), Hennessey et al.
patent: 3597056 (1971-08-01), Sasaki

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