Image transmission device for slit scanning type photocopying machine

Abstract

An image transmission means for employment in a photocopying machine wherein a document to be copied is scanned and image-wise light reflected therefrom is directed onto a photosensitive medium which is moved at a speed equal or proportional to the document scanning speed. The image transmission means comprises an image-transmitting light-conducting fiber array which transmits image light reflected from a document onto a photosensitive medium, and is so mounted that photosensitive medium portions which are less exposed due to characteristic variation in light transmission efficiency of different portions of the fiber array are disposed longitudinally with respect to the document image. Illumination of a document is provided by one or two tubular alternating current fluorescent lamps which are actuated to provide illumination which varies at a frequency and to a proportion that are selected with reference to the characteristic variations of different portions of the light-conducting fiber array. On the photosensitive medium, and hence on a subsequently produced document copy, variations due to alternation of document illumination occur transversely with respect to the image of the scanned document; that is at right-angles to the variations due to light-conducting fiber array characteristics. There is thus produced an image constituted by mesh portions.

Dependencies are inferred from the claim text.