Filmstrip for preventing fogging of intermediate film in microfi

Details Filmstrip for preventing fogging of intermediate film in microfi Filmstrip for preventing fogging of intermediate film in microfi

1981-08-06

1983-09-06

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Image transferred from individual documents to film strip

352233, 355133, 430496, 430501, G03B 2732, G03B 2752

Patent

active

044025971

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.

REFERENCES:
patent: 3411909 (1968-11-01), Kern et al.
patent: 3694083 (1972-09-01), White et al.
patent: 4235533 (1980-11-01), Norris

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