| 摘要 |
PURPOSE:To attain straight line flat scanning with a simple constitution, by rotating or vibrating a light source, reflecting an optical beam from the light source on a parabolic mirror, and projecting the beam on the surface of a photoreceptor. CONSTITUTION:An optical beam irradiated from a light source 1 is made to an optical beam in parallel with an optical axis cl on a parabolic mirror 4, reflected as a reflected light 5 and irradiated vertically on the photosensitive plane of a photosensitive drum 6. In vibrating the light source 1 with a rotary drive means 2 toward the arrows (a) and (b) alternately at a prescribed period, the optical beam irradiated from the light source 1 is reflected on the mirror 4 while the direction is being changed momently. Since the light source 1 is placed on the focus of the mirror 4, the reflected optical beam is always in parallel with the optical axis cl, regardless of the rotary angle of the light source 1, this is reflected as a reflected light 5, which is irradiated on the photosensitive plane of the drum 6 for horizontal scanning. |
