Mold for molding glass-made optical component
AssigneeOkamoto Glass Co., Ltd.
InventorsTomohisa MARU, Shoji KOTEGAWA, Satoshi TAKAHASHI
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Abstract
Provided with a glass flow passage mold having a lower mold provided on a female mold and an upper mold provided on a ring mold to connect the female mold, the ring mold and a molding mold having a lower molding mold and an upper molding mold into which molten glass gob is injected. The lower mold of the glass flow passage mold can be integrated with the female mold and detached from the female mold. The upper mold of the glass flow passage mold can be integrated with the ring mold and detached from the ring mold. In addition, the glass flow passage mold can be integrated with the molding mold. The above described features significantly improve the manufacturing yield and the productivity.
Claims1
A mold for molding a glass-made optical component having a three-dimensional shape, the mold comprising:
- a female mold which has a lower molding mold for molding the glass-made optical component on an outer edge portion of a concave surface of the female mold;
- a male mold which has a convex surface combined with the concave surface of the female mold;
- and
- a ring mold which is arranged on an outer peripheral portion of the male mold, the ring mold having an upper molding mold for molding the glass-made optical component, wherein
- molten glass gob introduced into the concave surface of the female mold is configured to be pressed from above by the male mold having the convex surface and injected in a space surrounded by the lower molding mold and the upper molding mold,
- a glass flow passage mold having a lower mold and an upper mold is provided to connect the female mold, the ring mold and the molding mold so that the molten glass gob is injected in the molding mold when the molten glass gob is pressed, the lower mold being provided on the outer edge portion of the concave surface of the female mold, the upper mold being provided on the ring mold, and
- a ratio (SA/SB) between a cross sectional area SA of a glass inlet side of a glass flow passage space surrounded by the glass flow passage mold and a cross sectional area SB of a glass outlet side of the glass flow passage space is within a range of 1.7 to 19.7 when a point A is defined as an end point of a center line in a glass flow path surface of the lower mold of the glass flow passage mold at the side of the female mold, a point B is defined as another end point of the center line in the glass flow path surface of the lower mold of the glass flow passage mold at the side of the molding mold, SA is defined as an area of a vertical cross-section (CA) of the glass flow passage space passing through the point A, the vertical cross-section being perpendicular to a vertical cross-section including the center line in the glass flow path surface of the lower mold when the female mold is placed horizontally, and SB is defined as an area of a vertical cross-section (CB) of the glass flow passage space passing through the point B, the vertical cross-section being perpendicular to the vertical cross-section including the center line in the glass flow path surface of the lower mold when the female mold is placed horizontally.
Dependencies are inferred from the claim text.