Optical element

Abstract

The horizontal axis shows the ratio of the coefficient of linear expansion B of the resin to the coefficient of linear expansion A of the substrate, and the vertical axis shows the thickness of the resin. O indicates that there was no peeling of the resin caused by damage to the substrate, and x indicates that peeling of the resin caused by damage to the substrate occurred. When the relationship of (B/A) and the resin thickness Y at which peeling of the resin does not occur is determined from these results, the following relationship (indicated by the curve in the figure) is obtained: Y≦200/(B/A)+30   (1) It is seen from this that peeling does not occur if the thickness of the resin is 30 μm or less. However, it was found that if (B/A) is small, peeling does not occur even at thicknesses greater than 30 μm, as long as the equation shown above is satisfied.

Dependencies are inferred from the claim text.