| 摘要 |
PCT No. PCT/JP82/00191 Sec. 371 Date Jan. 19, 1983 Sec. 102(e) Date Jan. 19, 1983 PCT Filed May 25, 1982 PCT Pub. No. WO82/04326 PCT Pub. Date Dec. 9, 1982.A transparent Fresnel plate having an outer face on which a large number of prisms having the form of minute ridges having sloped faces are disposed in parallel arrangement is used for changing the width and direction of light. Of sunlight projected onto the face where the ridges exist, light reflected by the sloped faces of the ridges becomes small in width and, at the same time, advances in a direction deviating from the direction of the projected light. In the path of this reflected light, a reflecting device for reflecting the same again toward a specific position or a device for collecting the energy of the reflected light is provided. The Fresnel plate, furthermore, can be used for receiving sunlight and introducing it into the interior of a house. In this case, sunlight rays of narrow width can be changed in light rays of broad width. The Fresnel plate can be used also as a blind or as a reflecting mirror for special uses.
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