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:
Sep. 06, 1983
Filed:
Aug. 06, 1981
Mark H McCormick-Goodhart, Grosse Pointe Woods, MI (US);
Energy Conversion Devices, Inc., Troy, MI (US);
Abstract
An improved photographic filmstrip having localized transmission barriers for inhibiting propagation of light into still unimaged transparent portions of microfiche recording system intermediate filmstrips by light-piping action is described. The barriers serve to optically isolate the subsequently-to-be-imaged still unexposed portion of the filmstrip in a dispensing film head from the illumination used to transfer the previously developed image on the exposed portion of the strip onto a permanent recording medium, such as a microfiche film card. The barriers consist of arrays of holes spanning the width of the filmstrip. Multiple scattering and direct escape paths produced by the holes cause significant reduction in the undesired propagation. Additional propagation reduction is achieved by a fiber bearing element pressed over the hole arrays so as to insert fiber clusters into the holes. Use of the arrays for sprocket engagement to facilitate film transport is described.