Recorder

Claim 1

A recorder operative for forming an image on a recording medium by illuminating a multitude of points on the surface of the recording medium to form lines of image points, the recorder comprising, in combination, a plurality of light-emitting elements; transport means for effecting relative movement between the light-emitting elements and a recording medium in a predetermined transport direction at a predetermined rate, the light-emitting elements being arranged in a plurality of rows, the rows being arranged successively in the transport direction, the rows extending at an angle relative to the transport direction, the elements of each single row being offset relative to the elements of the other rows in a direction transverse to the transport direction, the offsets among the elements of the individual rows being equal to j × d/N, wherein j is an integer including unity, d is the distance between adjoining elements of a single row, and N is the number of rows; optical means operative for receiving the light emitted by the individual light-emitting elements and projecting onto the recording medium a corresponding plurality of individual reduced-scale light points arranged in light point rows corresponding to the rows of light-emitting elements; and electrical control means operative for applying to the individual light-emitting elements electrical control signals determining the illumination of points on the recording-medium surface, and comprising means for effecting the formation of each line of image points by applyng to the rows of light-emitting elements respective groups of control signals all corresponding to the line of image points but delayed by respective time-delay intervals dependent upon the rate of transport and corresponding to the different distances among the light point rows as measured in the transport direction.