Method of manufacturing glass molded product and lower die for molding glass

A method of manufacturing a glass molded product by pressurizing and molding a molten glass droplet dropped downward from above, comprising the steps of:

• preparing a lower die including a lower die surface onto which said molten glass droplet is dropped;
• preparing an outer frame including an annularly formed inner circumferential surface and a second space forming surface formed to extend outward away from a lower end portion of said inner circumferential surface, with said lower end portion being defined as a starting point;
• arranging said lower die on an inner side of said outer frame such that said lower die surface is located below said lower end portion and a space is formed between said lower die surface and said lower end portion;
• dropping a prescribed amount of said molten glass droplet onto said lower die surface such that a surface of said molten glass droplet dropped onto said lower end surface connects said lower end portion and a portion of said lower die surface located on said inner side relative to a position of said lower end portion to each other, said molten glass droplet dropped onto said lower end surface comes in contact with the entire part of said inner circumferential surface and said molten glass droplet dropped onto said lower die surface does not wet-spread over said second space forming surface, wherein during said dropping there is a span of time at which said molten glass droplet is moving towards said lower die surface due to gravity and in which said molten glass droplet has not contacted said lower die surface;
• and
• pressurizing and molding said molten glass droplet by using said lower die, said outer frame, and an upper die after lapse of a prescribed period of time since drop of said molten glass droplet onto said lower die surface.

A method of manufacturing a glass molded product by pressurizing and molding a molten glass droplet dropped downward from above, comprising the steps of:

• preparing a lower die including a lower die surface onto which said molten glass droplet is dropped and a first space forming surface formed to extend downward away from an outer edge end portion of said lower die surface, with said outer edge end portion being defined as a starting point;
• preparing an outer frame including an annularly formed inner circumferential surface and a second space forming surface formed to extend outward away from a lower end portion of said inner circumferential surface, with said lower end portion being defined as a starting point;
• arranging said lower die on an inner side of said outer frame such that said outer edge end portion is located below said lower end portion and a space is formed between said outer edge end portion and said inner circumferential surface and between said lower die surface and said lower end portion;
• dropping a prescribed amount of said molten glass droplet onto said lower die surface such that a surface of said molten glass droplet dropped onto said lower die surface connects said outer edge end portion and said lower end portion to each other, said molten glass droplet dropped onto said lower end surface covers the entire surface of said lower die surface, said molten glass droplet dropped onto said lower end surface comes in contact with the entire part of said inner circumferential surface and said molten glass droplet dropped onto said lower die surface does not wet-spread over any of said first space forming surface and said second space forming surface, wherein during said dropping there is a span of time at which said molten glass droplet is moving towards said lower die surface due to gravity and in which said molten glass droplet has not contacted said lower dies surface;
• and
• pressurizing and molding said molten glass droplet by using said lower die, said outer frame, and an upper die after lapse of a prescribed period of time since drop of said molten glass droplet onto said lower die surface.