| 摘要 |
PURPOSE:To clearly express even a delicate image and to improve the expression of the gradation of the image by optionally adjust luminescent spots projected onto a photosensitive body by means of selectively making the optional number of plural light source emit light. CONSTITUTION:A beam emitted from a laser light source 1 is condensed by a condensing optical system 2 and transmitted into an optical fiber 3. Its one end is bundled and connected to a rotation mirror 4-2 and Ftheta lens group 4-1, 4-3, and 4-4. A light emitting element group 1 is connected to a power source, and by turning on and off this power source, optional element can emit light during optional hours. By selectively emitting light of the optional number of the plural solid light emitting element groups, the beam passes through the optical fiber 3 and is respectively projected as small luminescent spots on the surface of the photosensitive body 5. They become visible as dots and lines, when projecting time is short and long, respectively. Thus, the aggregation of the luminescent spots expresses a desired visible image clearly even minute part and with excellent gradation reproducibility. |
