| 摘要 |
<P>PROBLEM TO BE SOLVED: To constitute a light introducing device which efficiently introduces solar light incident from an optional direction at a large angle of incidence, a light converging unit which converges the introduced light, and a light converging device equipped with the same. Ž<P>SOLUTION: Two flat plate prisms 11 and 12 are disposed such that the angle that they form on the whole is an open (inclined) in the opening direction of a wedge angle α of the prisms. For example, the rear-side flat plate prism 12 is inclined to the front-side flat plate prism 11 by the wedge angle α of the flat plate prisms 11 and 12, and operating surfaces ES of the front-side flat plate prism 11 are parallel to a flat plate surface FS of the rear-stage flat plate prism 12. Consequently, light which is incident on a flat plate surface FS of a unit prism P1 of the front-side flat plate prism at an angle ϕ1 is refracted by an angle ϕ2 of refraction and projected from an operating surface ES at an angle ϕ3 of projection. This light is incident on a flat plate surface FS of a unit prism P2 of the rear-stage flat plate prism 12 at an angle ϕ3 of incidence. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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