Loading patent…
AssigneeEnergy Conversion Devices, Inc.
InventorsPeter Klose, Herbert Ovshinsky
Estimating the term…
An apparatus and methods for producing a transmission barrier for inhibiting propagation of light into still unimaged transparent portions of microfiche recording system intermediate film strips by light-piping action are described. The barrier serves to optically isolate the subsequently-to-be-imaged still unexposed portion of the film strip 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. In one exemplary form of the invention, the barrier regions are photographically produced dark bands or lines between the longitudinally spaced areas of the film strip to be imaged. These bands or lines are preferably created as latent images during the initial exposure of the intermediate film and subsequently developed at the same time as the record image. Alternative embodiments include placing bands or lines of light absorbing material on the film strip or by serrating or otherwise locally deforming the intermediate film strip to produce the barrier regions, the serrations serving to spoil total internal reflection in the film. Long term fogging of the film by normal ambient light is dealt with by providing an automatic film payout feature. Particular applications to archival microfiche systems involving the intermediate film strip carrying a transferable image are described. An apparatus for using pre-formed barriers on the film strip to regulate film advance is described.
A method for preventing light fogging of unexposed portions of an initially transparent film strip producing opaque imaged areas when imaged by imaging energy and contained within an imaging energy sealed portion of film support means from which a limited area of the film strip to be imaged is exposed to an external imaging energy region, comprising forming integral with the film strip in or on the film strip at least one propagation barrier region between each such limited area of the film strip to be imaged and the adjacent later to be exposed areas, each such barrier region having the property of inhibiting the propagation of said imaging energy into adjacent later to be exposed areas of said film strip by internal reflection of such energy between the opposite surfaces of the film.
A method for preventing light fogging of an intermediate film, having at least one exposed opaque portion and at least one unexposed transparent portion, during transfer of said image from said exposed portion to another film by subjecting said exposed portion to imaging energy for the transfer of said image comprising:
An improved photographic film strip for use in a microfiche recording system, said film strip comprising:
Dependencies are inferred from the claim text.