The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 27, 1980
Filed:
Jul. 31, 1978
Bram Kool, Saratoga, CA (US);
Janusz Warszawski, Los Altos, CA (US);
Jules G Moritz, Los Altos, CA (US);
Microform Data Systems, Inc., Mountain View, CA (US);
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.