Facsimile device

Claim 1

A facsimile device of the type comprising: a. rotating planar mirror means for scanning an imaging point optically and sequentially along a series of lines on a flat subject copy disposed in a plane parallel to and movable along the axis of rotation of said planar mirror means; wherein the improvement comprises: b. means for producing video signals indicative of the light characteristics along each of said lines scanned; c. means for sampling said video signals to obtain a series of data signals indicative of the light characteristics of the successive points sampled along each of said lines scanned; d. two memory means for receiving said data signals from said sampling means, each of which accepting a number of storage bits equal in number to the number of data signals obtained along one scanning line and each of which stores and shifts said data signals; e. switching means for switching the feeding of said data signals upon the completion of the scanning of each line, alternately between said two memory means; f. first means for producing a pulse train for controlling said sampling means and for shifting said two memory means while said data signals are being stored therein; g. second means for producing a pulse train for shifting the stored data signals at a constant frequency out of one of said two memory means and sending them on a transmission line while said data signals are stored in the other memory means; and h. means for controlling said first pulse train producing means, in response to the scanning speed of the imaging point on the subject copy, for frequency modulating the sampling pulse train and the pulse train which is used to shift the one of said two memory means which is storing the data signals in accordance with said scanning speed.