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Glass discharging device and method, and manufacturing method of pre-moulding parison and optical elements

A manufacturing method and glass technology, applied in glass pressing, glass manufacturing equipment, glass molding, etc., can solve the problems of corrugated ribs, air bubbles mixed into the preform, and the quality reduction of the preform, so as to achieve uniformity High, bias current suppression, high-quality effects

Inactive Publication Date: 2015-04-29
HOYA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the deflection occurs, gas is entrained in the molten glass 220, and air bubbles are mixed in the preform, or striae are generated, so there is a problem that the quality of the preform is lowered.

Method used

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  • Glass discharging device and method, and manufacturing method of pre-moulding parison and optical elements
  • Glass discharging device and method, and manufacturing method of pre-moulding parison and optical elements
  • Glass discharging device and method, and manufacturing method of pre-moulding parison and optical elements

Examples

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manufacture example

[0072] Optical elements were produced using each of the preforms described above. Here, a manufacturing example of an aspheric lens is shown as a manufacturing example of an optical element.

[0073] First, a press molding die consisting of an upper die, a lower die, and a cylinder die is prepared. The molding surfaces of the upper mold and the lower mold are precisely processed into a shape in which the concavity and convexity of the optically functional surface (lens surface) of the target aspheric lens are reversed, and a release film of carbon film is applied.

[0074] Next, the preform is introduced into the space surrounded by the upper mold, the lower mold, and the cylinder mold, heated together until the glass softens, and the upper mold and the lower mold are used to stamp the preform to precisely turn the shape of the molding surface. Printed onto glass, precision stamped into the shape of an aspheric lens.

[0075] The formed glass is then cooled and removed from ...

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Abstract

The invention provides a glass discharging device and method, and a manufacturing method of pre-moulding parison and optical elements. A pipe lower end is provided with a diameter expanding part which is capable of restraining deviated flowing of fused glass. In particular, the invention provides a glass discharging device, a glass discharging method, a manufacturing method of pre-moulding parison for punching forming, and a manufacturing method of an optical element. The glass discharging device (1) discharges fused glass from a pipe. A constant diameter part (6) and an expansion diameter part (8) are formed in a glass flow path (2) in which the fused glass can flow of the pipe. The constant diameter part (6) extends in upper and lower directions and the inner diameter is constant. The expansion diameter part is connected with the constant diameter part (6) and the inner diameter is gradually expanded towards lower end. A shrinkage diameter part (10) whose inner diameter shrinks towards tail end is formed on the inner surface of the lower end edge of the expansion diameter part (8).

Description

technical field [0001] The present invention relates to a glass outflow device, a glass outflow method, a method for manufacturing a preform for press molding, and a method for manufacturing an optical element, and more particularly to a glass outflow device and a glass outflow method for manufacturing glass moldings such as a preform , a method of manufacturing a preform for press molding using the glass outflow device and method, and a method of manufacturing an optical element using the preform manufactured by the manufacturing method. Background technique [0002] Conventionally, a method is known in which molten glass flows out from an outflow pipe, and a predetermined amount of molten glass gobs are supplied to a forming die to form a preform for press molding. A preform can be produced by molding and cooling a gob of molten glass supplied to a molding die. [0003] As such an outflow pipe, for example, in Patent Document 1 (particularly in image 3 Middle) discloses ...

Claims

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Application Information

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IPC IPC(8): C03B7/02C03B11/00
CPCC03B7/02C03B11/00
Inventor 上崎敦司
Owner HOYA CORP
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