Projection screen

DETAILED DESCRIPTION I claim: 1.
In a projection screen that includes a plurality of curved interior reflective surfaces arranged to provide at least one generally circularly arranged row of reflective surfaces and whereby each pair of adjacent surfaces is constructed and arranged to provide minimal effect upon reflection of projected light from the region of adjacency of the pair of surfaces, the improvement in construction comprising, in combination: at least one of each adjacent pair of the plurality of curved surfaces being provided as part of a prefinished panel that is of a size and shape to have an edge portion thereof overlap an edge portion of the adjacent curved reflective surface; said prefinished panel including a substrate sheet of metal that is originally of uniform thickness and is deformable and easily set upon deformation beyond the metal's elastic limit, and a continuous uniform reflective finish provided on the concave side of the substrate metal sheet prior to deformation of the metal sheet; a portion of the panel adjacent the edge thereof that overlaps the adjacent curved reflective surface being shaped and arranged and deformed, without destroying the continuous character of the uniform reflective finish on the metal substrate, to have the face of reflective finish at the edge terminus of the panel terminate adjacent the said adjacent reflective surface, with the thickness of the substrate sheet of metal adjacent said edge terminus being lessened, resulting in providing a back surface, opposite the reflective surface, that will lie adjacent the adjacent curved reflective surface, to cause the reflective finish at the edge terminus of the panel to be located closely adjacent the overlapped curved reflective surface, thereby minimizing any discontinuity between the reflective finish on the panel and the overlapped reflective surface.
2.
A projection screen as in claim 1 wherein the screen has the shape of a hollow dome suitable for a planetarium.
3.
A projection screen as in claim 2 wherein the screen includes a plurality of circularly arranged rows of reflective surfaces that are spherically dished