Solar light collecting mirror and solar thermal power generation system using said solar light collecting mirror

摘要

Provided are: a solar light collecting mirror capable of obtaining a high light-collecting efficiency, even in a solar thermal power generation system such as a tower-type solar thermal power generation system wherein the distance from a reflective mirror to a heat collector is a large distance of tens of meters to hundreds of meters, and also capable of being readily and inexpensively produced and of readily obtaining concave mirrors having a variety of curvatures; and a solar thermal power generation system using same. The solar light collecting mirror is configured such that : a protruding section of a substrate, using as a reference position the position of an inscribed circle in a reflective section, impels the rear surface of the reflective section further on the outside in the radial direction than the reference position; and, as a result, the surface of the reflective section further on the outside in the radial direction than the reference position bends towards the surface side in the Z direction.