| 摘要 |
PURPOSE:To form an image and to scan a reflected beam light on a desired locus line without a condensing optical system, by arranging a reflective mirror, which has such curvature that the reflected beam light is formed the image in a prescribed position, on each circumferential face of a regularly polygonal column. CONSTITUTION:In a polygon mirror 2, a reflective mirror 2, having a constant curvature is arranged on each circumferential face of the shape like a regularly polygonal column. A concave mirror, a convex mirror, an aspherical mirror, or a toroidal face mirror is used as the reflective mirror 2b. This reflective mirror 2b has such curvature that a beam light B from a beam light source 1 is reflected and is form an image on a face 4 to be scanned which is arranged at a prescribed interbal. Thus, the reflected beam light is formed the image on a certain desired locus line without a complicated condensing optical system. |
