Optics: image projectors – With sound accompaniment – Common picture and sound record carrier system
Patent
1975-08-14
1978-01-10
Stephan, Steven L.
Optics: image projectors
With sound accompaniment
Common picture and sound record carrier system
352 72, 353 94, 353DIG2, 360 80, G03B 3106, G03B 2126, G03B 2302, G11B 3100
Patent
active
040676471
ABSTRACT:
A dual film strip projector projects images onto at least one screen from a pair of film strips, each of which is advanced in programmed timing independently of the other. The film strips are contained in a cartridge that is readily insertable in the projector, and the timing of the advance of the frames of each film strip is automatically controlled by control signals recorded on a magnetic tape in another cartridge insertable in the projector. The projector includes dual illumination systems, projection lenses and film strip advancing devices. Operation of the projector is entirely automatic in that the control signals on the magnetic tape operate the pair of film strip advancing devices.
REFERENCES:
patent: 3139789 (1964-07-01), Schrader
patent: 3233512 (1966-02-01), Sampson
patent: 3561767 (1971-02-01), Negishi
patent: 3675994 (1972-07-01), Badalich et al.
patent: 3702721 (1972-11-01), Skuja
patent: 3748031 (1973-08-01), Youngblood
patent: 3841746 (1974-10-01), Chase
Telex, Instructional Cassette Equipment, advertising brochure, Oct. 1973.
Developing Techniques Laboratory, Inc.
Stephan Steven L.
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