Hoya Corporation

Yoshikane Shinkuma

Masahiro Yoshida

Katsumi Utsugi

Xuelu Zou

Akira Murakami

Yoshinori Iguchi

Atsushi Watabe

In the method for manufacturing preforms for press molding, a glass melt gob is separated from glass melt flow flowing out of a pipe and the glass melt gob is molded into a preform for press molding on a glass gob casting mold. The method comprises a viscosity-increasing step to increase viscosity of the glass melt.

Methods for manufacturing performs for press molding and method for manufacturing optical elements

Disclosed are a process for producing a glass shaped material having high quality and high mass accuracy and a process for producing an optical element, which includes the preparation of a glass shaped material having high quality and high mass accuracy, the heating of said glass shaped material and the precision-press-molding thereof. The present invention provides a process for producing a glass shaped material including the separation of a predetermined amount of a molten glass gob from the forward end of a molten glass flow flowing down from a flow pipe, by a specific means and the shaping thereof into the glass shaped material, a process for producing a glass shaped material including the dropping of a molten glass drop from a flow pipe, the receipt thereof with a shaping mold that ejects a gas, by a specific means, and the shaping thereof into the glass shaped material while it is caused to float, and a process for producing an optical element including the precision press-molding of a preform obtained by one of these processes.

Process for producing glass shaped material and process for producing optical element

A process for stably and efficiently producing quality glass articles such as preforms at high yields, and a process for producing an optical device from the preform obtained by the above process. In the process for producing a glass article, molten glass gobs having a predetermined weight each are poured, or molten glass drops having a predetermined weight each are dropped through a nozzle, into a boiling liquid having a boiling point lower than the class transition temperature of the glass constituting said glass article or a liquid which is temperature-adjusted beforehand so as to be caused to boil by the amount of heat of the glass, to form glass articles.

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Tokyo, Japan

Yoshikane Shinkuma