Patent ID: 8997523
Filing Date: 2015-04-07
Classification: C03B,Y02P

Abstract:
1. A method of manufacturing a glass molding having an optical surface, the method comprising: using a lower mold and an upper mold, dropping a molten glass drop onto said lower mold, and press molding said molten glass drop with said lower mold and said upper mold, said lower mold comprising: wherein a first part of said molten glass drop fills said recess and a second part of said molten glass drop is located above said outer peripheral planar portion, and wherein a dropping volume of said molten glass drop being such that, when dropped onto said lower mold, a volume of said second part of said molten glass drop is 4.0 times to 6.0 times a volume of said first part of said molten glass drop so that said second part of said molten glass drop is rounded with centripetal force generated by surface tension of said molten glass drop acting on said first part of said molten glass drop.