Abstract: A 3D printer comprises a scanning laser system. A donor sheet is located in the focal plane of the optical system and carries a thermally transferable colourant such as a dye or pigment. A lenticular screen has a colourant receiving layer which receives colourant from the donor sheet to form 3D pixels, each comprising interlaced 2D pixels, aligned with lenticules of the screen. A detector array responds to laser light which has been transmitted through the lenticular screen, and a print register control system uses the detector output correctly to position the scanning laser beam to compensate for irregularities in the lenticular screen.

Abstract: An image forming apparatus including an image bearing member, a charging unit, a laser beam scanning apparatus and a developing unit. The laser beam scanning apparatus includes a semiconductor laser array for emitting laser beams, a collimator lens for collimating the beams, a rotating polygon mirror for deflecting the beams collimated by the lens, and an aperture stop between the laser array and the mirror. The following relations between the aforementioned elements of the apparatus are satisfied: ##EQU1## where f is a focal length of the collimator lens; s is a distance between a focal point on a mirror side of the collimator lens and the aperture stop; t is a distance between one of the light emitting portions that is spaced farthest, relative to others of the light emitting portions, from the optical axis; D is a diameter of the aperture stop, and d is a diameter of each of the laser beams collimated by the collimator lens.

Abstract: A xerographic print engine includes a rotatable photoreceptor belt. The photoreceptor is exposed by delivering energy to the inward-facing side of the belt, and the electrostatic latent image is developed by applying toner to the outward-facing side of the belt. The system is particularly useful for liquid-development based xerographic systems, as multiple layers of toner can be accumulated on the outward-facing side of the photoreceptor belt without interfering with subsequent exposure steps. A cylindrical lens is in contact with the photoreceptor belt and is adapted to focus light from a light source at a developing region of the photoreceptor belt.