| http://www.w3.org/ns/prov#value | - The shift generating optical system 30 is constructed with a striped mask plate which is formed, arranging n individual masks 30a (see FIGS. 7A and 7B) in the direction perpendicular to the sheet surface, by vaporization, a printing process or the like on the surface of a transparent substrate such as a glass, a plastic film or the like.
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