Multi-mirror heliostat

[0023]A multi-mirror heliostat according to an embodiment of the present invention will be explained with reference to FIGS. 1 to 14.

[0024]The multi-mirror heliostat 1 has ten mirrors 2. A number of such heliostats 1 are arranged in a field around a tower (not illustrated) having a target at the top thereof. Each of the heliostats 1 reflects sunlight onto the target of the tower.

[0025]Each of the mirrors 2 of the heliostat 1 is circular having a diameter of 50 centimeters. A reflection surface of the mirror 2 is a concave (or spherical) mirror whose curvature is dependent on a substantial focal length. As illustrated in FIG. 8, the mirror 2 is bonded to a base 3 made of aluminum alloy and the back of the base 3 is supported with a spacer 4 that is fixed to a disk 5 made of metal.

[0026]The heliostat 1 has a support post 6 that is fixed to the ground. Arranged at the top of the support post 6 is a drive 7 that is turnable in a horizontal direction. From the drive 7, a rotary shaft 8 hori