Solar reflecting mirror having a protective coating and method of making same

摘要: A solar reflecting mirror includes a shaped glass substrate having focal area, reflective coating over its convex surface and sodium ion barrier layer concave surface. The has strain pattern radial tension at the bottom circumferential compression periphery of substrate. As distance from increases, decreases to “transition line” where begins. transition line in direction toward area increases. To compensate for avoid buckling of, cracks layer, including an oxide silicon aluminum thickness, among other things is varied on. method making sections also discussed.