| 摘要 |
PROBLEM TO BE SOLVED: To provide a Fresnel type mirror covering an expanded wide visual field even if the number of the mirrors is only one. SOLUTION: In a configuration of this Fresnel type mirror 1, a convex mirror 10 is separated into a large number of annular mirror surfaces 3 having different radii with a central axis O passing through a sphere center as the center, and the annular mirror surfaces 3 are planarly rearranged with the central axis O as a common axis. In the Fresnel type mirror 1 with the configuration, a spherical surface radius R of the annular mirror surface 3 positioned in an external area to the annular mirror surface 3 positioned in a center area on the central axis side is reduced. COPYRIGHT: (C)2009,JPO&INPIT
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