Optics: image projectors – Selective data retrieval – Film strip
Patent
1978-07-31
1980-05-27
Haroian, Harry N.
Optics: image projectors
Selective data retrieval
Film strip
353117, 353 27R, 353121, G03B 2308, G03B 2312
Patent
active
042047536
ABSTRACT:
Apparatus for holding film strips of the type having a plurality of miniaturized film images carried thereon, wherein the apparatus is to be used with an optical system which illuminates and projects the images on an enlarged scale so that they can be viewed on a projection screen. The apparatus includes a rotary film holder or cassette having a number of concentric cylindrical segments defining a pair of coaxial cylinders, the segments being provided with grooves to permit insertion of a plurality of film strips in the cassette. The inner segments are longer than the outer segments so that portions of the radially outermost edges of the film strips are exposed and the outer edge of a selected film strip can be engaged by an edge drive wheel to permit the selected film strip to be moved partially out of and to be returned to the cassette. The cassette is rotatably mounted by spaced bearings on a projection carried by a stationary support, and a drive wheel coupled to a reversible motor engages the outer periphery of the cassette to rotate it in opposed directions. An optical system on the support is used with an X-Y drive to project an image on the selected film strip onto a screen when the film strip is releasably held in a predetermined focal plane by hold-down means. Control structure coupled with the drive motors of the cassette, the edge drive wheel and the X-Y drive controls such motors to effect operation of the apparatus.
REFERENCES:
patent: 1371871 (1921-03-01), Dietz
patent: 3458253 (1969-07-01), Hansen
patent: 3743400 (1973-07-01), Haning et al.
patent: 3800942 (1974-04-01), Hirata et al.
patent: 3822937 (1974-07-01), Kroeger
patent: 3920324 (1975-11-01), Otto
patent: 4059352 (1977-11-01), Bar et al.
Kool Bram
Moritz Jules G.
Warszawski Janusz
Haroian Harry N.
McGannon John L.
Microform Data Systems, Inc.
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