A thermal panel comprises (a) a body including a solar radiation transmitting lens sheet, having opposite surfaces characterized in that solar radiation incident on one surface is focussed at one or more narrow zones at the body opposite surface, (b) a coating on said body opposite surface and defining aperture means in registration with one or more of said narrow zones, whereby solar radiation focussed at said zones may pass through said aperture means, and (c) said coating having a reflective surface facing away from said body.
A solar ray energy collecting device capable of effectively separating and collecting only a light component of a desired wave length among the solar rays. The solar ray energy collecting device comprises a light focusing lens being provided with a light intercepting member on the central part thereof, an optical conductor having a light-receiving edge situated at the position of the lens' focus, a reflector installed at the circumferential portion of the optical conductor, and means for collecting energy of the light component reflected by the reflector.
