| 摘要 |
PURPOSE:To enable reflection of incident light in a wide range to the incident direction thereof by disposing the incident faces of plural reflecting means which reflect the incident light in the same direction as the incident direction on the approximate curve. CONSTITUTION:Plural pieces of the unit reflectors C each of which is a tetrahedron formed to have an incident face A at one face and reflecting faces at the remaining three faces are disposed on the outside peripheral surface B of a spherical body D in such a way that the faces A thereof are continuously adjacent to each other and that the entire part constitutes an approximately spherical shape D. The light incident on such curve is surely reflected to the incident direction by any of the adjacent reflectors C even if the incident angle thereof exceeds the critical angle of one unit reflector C. The reflection of the incident light in the considerably wider range as compared to the conventional prism to the incident direction thereof is thus made possible and the degree of freedom in the installation place is increased.
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