Arrangement for the recording of rastered half tone pictures to avoid striping

Claim 1

An arrangement for the recording of rastered half tone pictures, in which each raster point is formed on the recording medium by a plurality of parallel recording lines, extending in the recording direction, produced by a plurality of individually controlled light beams, discharged from beam emergence openings, of a recording device, aligned in a row extending transversely to the recording direction, and focused on the recording medium by objective lens means disposed on the beam path between said emergence openings and said recording medium, comprising an optical element interposed in the path of the light beams, said optical element being dimensioned to be operative on approximately half of the number of beams and oriented to refract the beams impacting it in the direction of alignment of said emergence openings, for effecting exposure of areas of the recording medium intermediate the areas impacted by the remaining unrefracted beams, thereby eliminating unexposed portions of the recording media between said parallel recording lines.