Optics: motion pictures – With sound accompaniment – Common picture and sound record carrier systems
Patent
1977-07-22
1979-04-10
Hayes, Monroe H.
Optics: motion pictures
With sound accompaniment
Common picture and sound record carrier systems
352 14, 352157, 352159, G03B 3102, G03B 156
Patent
active
041485670
ABSTRACT:
A sound motion picture projection apparatus provided with pressure pad means operable to press a film against magnetic sound recording and reproducing head means disposed along a path of the film for sound recording and/or reproduction. Urging means urge the pressure pad means toward its film pressing position. Externally operable means are provided for shifting the pressure pad means from its film pressing position to a released position against the urging force of the urging means. Releasable locking means are provided for holding the pressure pad means in the released position against the urging force of the urging means; and film detecting means are disposed in said sound film path behind the magnetic head means to detect introduction of the film into the sound film path and to release the locking of the pressure pad means by the locking means. Thereby, when film introduction into the film path for sound recording and/or reproduction is detected by the film detecting means, the pressure pad means is automatically changed from the released position to the film pressing position.
REFERENCES:
patent: 3208654 (1965-09-01), Gasser
patent: 3743398 (1973-07-01), Johnson et al.
patent: 3967886 (1976-07-01), Komine et al.
patent: 3993404 (1976-11-01), Coomer et al.
Ashida Akira
Itani Takashi
Maeda Masaya
Suzaki Kuniyoshi
Takahashi Kiyoshi
Canon Kabushiki Kaisha
Hayes Monroe H.
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