| 摘要 |
<p>Disclosed is a fly's eye lens wherein generation of steps on the boundaries between cells is eliminated. The fly's eye lens has the plurality of cells disposed on a first plane (a). The cells include a pair of cells adjacent to each other, said pair of cells respectively having the sphere centers on a second plane (ß) parallel to the first plane (a), and having parts of the spherical surfaces having different spherical radiuses as the surfaces of the cells. The pair of cells satisfy the relationship of RI 2-LI 2=RO 2-LO 2, wherein RI is the spherical radius of the surface of one cell, RO is the spherical radius of the surface of the other cell, LI is the distance between the spherical center of the surface of said cell and the boundary surface between the pair of cells, and LO is the distance between the spherical center of the surface of the other cell and the boundary surface between the pair of cells.</p> |
