Production manner of the die and the glass substrate for glass substrate formation, production manner of the glass substrate for information record media and the production mannered null melting glass

摘要

The melted glass pressing forming, it offers the production method and the like of the glass baseplate which uses the die and the said die which for glass baseplate formation can produce the glass baseplate which possesses flatness it is high with the method of producing the glass baseplate. The melted glass is supplied, the cope to which has 2nd the formation aspect in order to pressurize the melted glass with the under mold and 1st the formation aspect to which has 1st the formation aspect in order to pressurize the said melted glass which is supplied and, being the die which it possesses, surface roughness Ra of the periphery which contacts with the melted glass after the pressurizing than surface roughness Ra of the center to which 1st contacts with the melted glass among the formation aspects and before the pressurizing, is larger.