GLASS PREFORM AND METHOD OF MANUFACTURE THEREOF

摘要

Disclosed is a glass preform which has high volume accuracy and excellent surface quality and is low cost. Specifically disclosed are: a glass preform formed from a press-molded glass mass and having an unpolished surface; and a glass preform manufacturing method which comprises molding molten glass into a glass mass having a predetermined configuration and press-molding the glass mass by use of a mold having at least a concave portion or a convex portion.