Optical condenser, rotational axis setting method therefor, and heat collection apparatus and solar power generation apparatus equipped with optical condenser

摘要

Optical axis vectors indicating the direction of the optical axis of a mirror structure at a plurality of times in a prescribed day are obtained for each of the plurality of times, said mirror structure being oriented towards a position onto which light from the sun is condensed. A cone having a generatrix along which direction line segments of the optical vectors for each of the plurality of times extend is subsequently determined, and a cone central axis vector indicating the direction of the central axis of the cone is obtained. A first rotational axis of an optical condenser is set so as to be parallel with the cone central axis vector.