| 摘要 |
PURPOSE:To perform the simultaneous deflection of plural beams through a simple structure without requiring any complicate adjustment by providing concentrically plural arrays of holograms different in angle of deflection on a hologram disk and deflecting the beams, in each array. CONSTITUTION:When three laser beams are scanned, the beams from a laser diode array 15 are deflected by a hologram scanner 16. Holograms consist of hologram lenses arrayed on three concentric circles A-C, whose deflection angles and image-formation positions are different, in each hologram array, corresponding to the hologram arrays A-C to obtain scanning lines of the same length at different positions. Therefore, this photoscanner eliminates the need to uniform the optical path length of every beam, and the respective beams are guided to photosensitive bodies 11-13 by reflecting mirrors 19-21 to record images in the same size on the respective photosensitive bodies. |
