MIRROR AND MIRROR SUBSTRATE WITH HIGH ASPECT RATIO, AND METHOD AND MEANS FOR PRODUCING SUCH MIRROR SUBSTRATE

摘要

To provide a mirror substrate which has a high aspect ratio and small absolute thickness and also offers superior surface quality, dimensional precision and stability, and to provide a support body that can be used to produce the high aspect ratio mirror substrate and a mirror, and a method of manufacturing such mirror substrate and mirror.SOLUTION: A mirror substrate disclosed herein has a mean linear thermal expansion coefficient, a ratio of a lateral dimension to a maximum thickness, a weight per unit area, and a surface roughness, which are within specific conditional ranges.SELECTED DRAWING: None