| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a glass preform which has high volume accuracy and excellent surface quality and is low cost. <P>SOLUTION: The glass preform is characterized by comprising a press-molded body of a glass block and having an unpolished surface. And, the method for manufacturing the glass preform is characterized by containing processes in which a glass block having a predetermined shape is manufactured by molding molten glass and the glass block is press-molded using a mold having at least a concave part or a convex part. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
