Apparatus for manufacturing glass molding

Abstract

Provided is an apparatus for manufacturing a glass molding which can manufacture a glass molding having a high precision optical surface. An apparatus for manufacturing a glass molding has a lower die which receives molten glass, and an upper die which pressure molds the molten glass supplied to the lower die in conjunction therewith, wherein the upper die has a first molding surface which transfers the optical surface, a second flat molding surface provided around the periphery of the first molding surface, and a third molding surface provided around the periphery of the second molding surface and tilting relative to the central axis of the upper die passing through the center of the first molding surface to spread in the direction of the lower die.

Description

technical field [0001] The present invention relates to a glass forming body manufacturing device, in particular to a glass forming body manufacturing device which pressurizes molten glass with a molding die to obtain a glass forming body. Background technique [0002] Glass optical components are used in a wide range of applications such as digital camera lenses, optical pickup lenses such as DVDs, mobile phone camera lenses, optical communication coupling lenses, and various mirrors. Such glass optical elements are currently mostly produced by compression molding in which a glass material is pressurized with a molding die. In particular, optical elements with aspheric optical surfaces are not easily formed by grinding and polishing, so they are generally produced by compression molding using a molding die. Among them, the direct press method, in which molten glass is directly pressure-molded with a molding die to obtain glass optical elements, is attracting attention beca...

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Problems solved by technology

[0005] However, the cooling rate of the molten glass during the molding process is different between the upper surface and the lower surface of the molten glass or between the central part and the peripheral part, and the amount of shrinkage caused by cooling is not uniform. It is very difficult to form a high-precision optical surface on the lower side that is rapidly cooled

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