| 摘要 |
PURPOSE:To reduce the thickness difference of an image-forming element, to improve the precision and to use it for an electrophotographic copying machine or the like by forming lenses, which are joined to a reflecting part where roof-shaped reflecting surfaces are formed continuously, so that the incidence or reflecting surface of light of the image-forming element has a refractive index distribution. CONSTITUTION:Roof-shaped surfaces 11a and 11b forming right angles are formed continuously, and a reflecting film is formed on surfaces 11a and 11b by vacuum evaporation of Al, Ag, or the like to form the reflecting part, and the incidence surface of light and the exit surface of reflected light are formed to a common plane 12, thereby producing an image-forming element 10 consisting of a roof mirror lens array. A mask matched to the diameter of plane lenses 13 is used to diffuse a dopant on the plane 12 by the ion exchange diffusing method, the plastic diffusion polymerizing method, or the like for the purpose of forming plane lenses 13 on the plane 12, and lens parts having the image-forming function are formed. Thus, the image-forming element is obtained which is thin and has a high precision because of junction of the reflecting part and lenses and has a high image-forming capacity and is suitable for the optical system of the electrophotographic copying machine.
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