Metalization of Signal Surface

A layer of aluminum is vacuum deposited on the data side of the disc to form the signal surface. Typically 0.10 to 0.15 micron of aluminum is used to achieve high reflectivity. Contamination of the surface may result in "pinholes," regions of inadequate depostion and thus reflectivity, leading to rejection of the disc.

Last updated November 29, 2004.
Copyright George Watson, Univ. of Delaware, 1996.