Abstract: An image forming apparatus includes a photoreceptor; a plurality of laser beam generation means for generating a plurality of laser beams, respectively; and an optical system in which the plurality of laser beams pass through and scan simultaneously a plurality of lines on the photoreceptor, and thereby dot images are formed on the photoreceptor. The difference in wavelength among the plurality of laser beams is less than a diameter of one dot of laser beam.

Abstract: In a copying machine, a sheet conveyance mechanism which allows an image to be copied on both sides of a sheet of paper. The sheet conveyance mechanism includes an intermediate tray in which the sheet is copied on one side thereof by an image copy section, a friction roller capable of effecting reversible rotation and a double feed preventing roller. In operation, a sheet of paper is conveyed by the friction roller into the intermediate tray in which an image is copied onto one side of the sheet, the sheet is then removed by the friction roller, rotating in the reverse direction and transported back to the intermediate tray in which an image is copied on the second side of the sheet.