G - Physics – 03 – B
Patent
G - Physics
03
B
96/262, 95/95
G03B 41/00 (2006.01) G03B 27/04 (2006.01) G03B 27/47 (2006.01) G03C 1/765 (2006.01) G03C 1/825 (2006.01)
Patent
CA 1158908
ABSTRACT 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 (71) by light-piping action are described. The barrier serves to optically isolate the sub- sequently-to-be-imaged still unexposed portion of the film strip (71) in a dispensing film head from the illumination used to transfer the previously developed image on the exposed portion of the strip (71) onto a permanent recording medium, such as a microfiche film card (20). In one exemplary form of the invention, the barrier regions are photographically produced dark bands (260) or lines (262) between the longitudinally spaced areas of the film strip to be imaged. These bands (260) or lines (262) are preferably created as latent images during the initial exposure of the intermediate film (71) 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 in- termediate film strip to produce the barrier re- gions, the serrations (274) 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 (71) carrying a transferable image are described. An apparatus for using pre-formed barriers on the film strip (71) to regulate film advance is de- scribed.
390098
Klose Peter H.
Ovshinsky Herbert C.
Energy Conversion Devices Inc.
Macrae & Co.
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