GLASS FOR MULTILAYER FILM FILTER AND PROCESS FOR PRODUCING THE SAME

摘要

A glass composed of SiO2, B2O3, Na2O, K2O, MgO and Al2O3, containing a partial crystal and having an average thermal expansion coefficient of 125x10<-7>K<-1> over a temperature range from 50ºC to 150ºC has a high thermal expansion coefficient. Consequently, when it is applied to a substrate for multilayer film filters, temperature-related changes in the filter characteristics can be reduced sufficiently.