METHOD FOR PRODUCING GLASS SUBSTRATE FOR INFORMATION RECORDING MEDIUM, GLASS SUBSTRATE FOR INFORMATION RECORDING MEDIUM, AND INFORMATION RECORDING MEDIUM

摘要

Disclosed is a method for producing a glass substrate for information recording medium at low cost, wherein a stable chemical strengthening treatment can be performed by conveying a glass substrate in such a manner that the temperature decrease from the time when the glass substrate is taken out of a preheating vessel to the time when the glass substrate is immersed into a chemical strengthening treatment liquid is suppressed to 10°C or less, thereby minimizing variations of temperature of the glass substrate at the time when it is immersed into the chemical strengthening treatment liquid. Also disclosed are a glass substrate for information recording medium, and an information recording medium.