Mirror mechanism for a film projector

Details Mirror mechanism for a film projector Mirror mechanism for a film projector

1977-11-18

1979-04-10

Hayes, Monroe H.

Optics: motion pictures

Optical rectifier type

Reflector angularly displaced about fixed axis

G03B 4110

Patent

active

041485688

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.

REFERENCES:
patent: 1808603 (1931-06-01), Huc
patent: 1875193 (1932-08-01), Ruhnau
patent: 3708226 (1973-01-01), Askren et al.

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