| 摘要 |
PROBLEM TO BE SOLVED: To reduce the size and weight of a support base and a foundation.SOLUTION: A heliostat 30 comprises: a mirror structure 31; a driving device 40 for changing the direction of the mirror structure; and a support base 80 for supporting the driving device 40. The support base 80 comprises: a truncated conical shaped support post 82; and an arm plate 86 which is fixed at an upper end of the support post 82, and which supports in such a manner that an elevation angle with respect to a horizontal surface of a first rotary shaft 52 of the driving device 40 is changeable. The arm plate 86 has a rotary shaft receiving part which receives the first rotary shaft 52 so that the elevation angle can be changed. The rotary shaft receiving part receives a part which in the first rotary shaft, the part being a part different from the center of gravity Q2 of the mirror structure 31, and being a part on an extension line of a support shaft As. Also, the support shaft As of the support post 82 is inclined with respect to the horizontal surface so that the center of gravity Q2 of the mirror structure 31 is located vertically upward of a cross section in a lower end part of the support post 82. |
