| 摘要 |
PROBLEM TO BE SOLVED: To provide a collective mirror that is compact with an easily controllable optical system and comprises segment type parabolic mirrors. SOLUTION: The optical system is configured in a small depth, long in the lateral direction and short in the vertical direction by combining segment type parabolic mirrors having different focal lengths. With this method, an azimuth and an elevation angle to a position of the sun can be determined with respect to one focus as the center, and the sunlight can be followed without using a heliostat mirror. COPYRIGHT: (C)2008,JPO&INPIT
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