Method of manufacturing a substrate with concave portions, a substrate with concave portions, a substrate with concave portions for microlenses, a microlens substrate, a transmission screen and a rear projector

摘要

A method of manufacturing a substrate 5 with a plurality of concave portions 3 according to the invention includes the steps of forming a mask 6 on the substrate 5 , forming a plurality of initial holes 61 on the mask 6 by means of a physical method such as blast processing or irradiation with laser beams, and forming the plurality of concave portions in the substrate 5 by subjecting the mask 6 with the plurality of initial holes 61 to an etching process. In case of carrying out the blast processing, glass beads whose average diameter is in the range of 50 to 100 mum are used as blast media.