| 摘要 |
PURPOSE:To increase the ratio of focusing by a method wherein linear Fresnel lenses are superposed in double stages and thus so arranged that the lens grooves of each stage become rectangular to each other. CONSTITUTION:The linear Fresnel lens can focus light only in one axial direction, but, when two linear Fresnel lenses are superposed by making lens grooves rectangular, the light passing through the superpositional part is focused in two axial directions. Therefore, the dense arrangement of a plurality of linear Fresnel lenses on a plane is designated as a pair, and each pair is changed in direction at 90 deg.C and superposed into double stages, which are then formed as focusing modules 7 of a solar ray power generator. Since the lens parts are densely arranged on a plane, the solar ray can be effectively utilized. |
