| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To suppress uneven incidence of solar light onto a light receiving face of a solar cell to be lower in a light condensing solar energy generation system comprising a flat plate Fresnel lens and a secondary light collector in combination thereof. <P>SOLUTION: Many concentric toric protruded stripes 11 having a substantially triangular prismatic cross section are formed on the surface side of a flat plate to form the Fresnel lens 1, and the shape of the cross section 11 of these protruded stripes 11 is set such that a focal length of the protruded stripes 11 along an inner circumference of the lens is shorter than that of the stripes 11 along an outer circumference of the lens. The setting of the cross sectional configuration of the protruded stripes 11 in this case is achieved by changing an apex angle of the substantially triangular prismatic cross section to a proper angle. <P>COPYRIGHT: (C)2004,JPO&NCIPI</p> |
