Patent ID: 6384896
Filing Date: 2002-05-07
Classification: G01N,G02B,G03B

Abstract:
A microfilm search device for distinguishing presence of frames from a density change in a running direction of a microfilm and searching for a desired frame from the microfilm, comprising:a first block arranged across the microfilm in a width direction; a second block arranged across the microfilm in the width direction, end faces of the first and second blocks being opposed to each other with the microfilm placed therebetween; first optical fibers whose end faces pass through and are held by the first block; second optical fibers whose end faces pass through and are held by the second block, the first and second optical fibers are opposed to each other while the microfilm is placed between the end faces in different positions in the film width direction; a light source used in guiding light to said first optical fibers; a photosensor for detecting a quality of light incident on said second optical fibers; a binarizing section for binarizing an output of the photosensor; and a searching section for determining the presence of frames based on binarized signals to perform frame search; wherein end portions of said second optical fibers are bunched on the side of said light source, and a bunched portion is detachably and non-rotatably held relative to one lamp incorporated in said light source and said bunched portion has a protrusion that engages with a box containing the lamp and preserves the relative orientation of the fibers with respect to the lamp.