| 摘要 |
<p>PROBLEM TO BE SOLVED: To change the distance of a light spot by an easy method in a solid scanning system by providing an optical path changing mirror member having curvature in an arraying direction at least, one surface of an image-forming element array. SOLUTION: An optical path changing mirror 4 functioning as the optical path changing mirror member is provided in an optical path between the image- forming element array 1 and a photoreceptor 3. As for the mirror 4, at least, one surface thereof is formed to be a plane mirror and other one surface is made a surface having the curvature in the arraying direction and formed to be a concave mirror whose cross sectional shape in the arraying direction is aspherical. The plane mirror and the concave mirror are formed to be back to back with each other. The mirror 4 is rotated centering a shaft parallel with the arraying direction by a switching means so as to switch the concave mirror and the plane mirror, whereby the distance of the light spot on the surface to be scanned of the photoreceptor 3 is optionally changed.</p> |
