Press molding method for manufacturing of glass substrate
AssigneeMinolta Co., Ltd.
InventorsShiro Nishimoto, Mitsugu Tokunaga, Hideki Kawai, Toshiharu Mori, Shinji Fukumoto
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Abstract
The present invention relates to a glass substrate of which the outer periphery portion is unprocessed. The present invention also relates to a manufacturing method for a glass substrate of which the outer periphery portion is unprocessed, characterized in that a first lapping process, a second lapping process, a polishing process and a washing process are carried out after a press molding process is carried out so as to compress glass between an upper mold and a lower mold without regulating the edge surface of the outer periphery portion of the glass and, then, a crystallization process or an annealing process is carried out.
Claims2
A manufacturing method for a glass substrate, comprising the steps of:
- melting a glass material;
- flowing the melted glass into a lower mold;
- press molding the glass between an upper mold and the lower mold into a glass substrate;
- detecting the center of gravity of the glass substrate;
- and
- creating a center hole so that the center of gravity becomes the center of the center hole.
Dependencies are inferred from the claim text.