| 摘要 |
PROBLEM TO BE SOLVED: To obtain a lens array for an erect real image having simple constitution, made excellent in mass-productivity, made compact, making the distance between object images short and having excellent performance. SOLUTION: Equal fine projecting condensing curved surfaces are respectively arranged at equal intervals in a state where they are connected through a thin base layer on a line on the front surface and the back surface of a plane parallel transparent base plate, and the light condensing curved surfaces on the front and the back surfaces hold an optical axis in common. The 1st image of an object is reduced and formed at a distance being nearly 1/2 thickness of the base plate by the projecting condensing curved surface on the object side, and the image is enlarged and reformed by the projecting condensing curved surface on an image side so as to obtain an erect real image. By setting relation between the thickness of the base plate and curvature, the erect image is obtained. A metallic mold is formed by pressing a punch on one projecting condensing curved surface to a metallic plane at equal intervals. Ultraviolet curing resin is dripped on the metallic mold and a transparent base plate is placed thereon, and ultraviolet rays are radiated from a base plate side. The material of the projecting condensing curved surface layer on the object side is equal to that of the base plate and the layer and the base plate are integrally molded by an injection molding method when the material is plastic, and by a press molding method when the material is glass.
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