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Precision mould-pressing forming prefoamer production method and optical component production method

A technology of compression molding and manufacturing method, which is applied in the field of manufacture of pre-foamed body for precision compression molding and the manufacture of optical components, can solve the problem of high technical difficulty and achieve the effect of preventing thermal bonding

Active Publication Date: 2006-12-20
HOYA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the molten glass must be directly formed into a pre-foam without defects, the technical difficulty is much higher than that of the cold working method.

Method used

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  • Precision mould-pressing forming prefoamer production method and optical component production method
  • Precision mould-pressing forming prefoamer production method and optical component production method
  • Precision mould-pressing forming prefoamer production method and optical component production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] Put nd: 1.8468, vd: 23.5 as P 2 o 5 , R 2 O(R: Li, Na, K), Nb 2 o 5 Fragments of glass, the main component of which are put into a platinum crucible, are melted at 1000°C, defoamed and melted at 1100°C, stirred evenly, and molten glass is obtained. The molten glass was passed through a temperature-controlled platinum tube bonded to the bottom of the crucible, and flowed out from a platinum alloy nozzle at 900°C at a flow rate of 1.21 kg / hour (top outer diameter: Ф6.0mm, central hole diameter: 1.1mm ) flow out continuously.

[0090] On the other hand, if figure 1 As shown, 12 molding dies are evenly arranged on the outer periphery of the rotary table. A member processed into a concave surface of a porous material was embedded in the molding surface of the molding die, and 0.3 liter / minute of nitrogen gas was blown toward the molding surface side. In addition, a heater was attached to the main body of the molding die to heat the main body of the mold to 310°C.

[...

Embodiment 2

[0094] Only the molding die was changed to the following die, and the pre-foam was molded by the same method as in Example 1. The shape of the recess on the molding surface of the molding die is the same as in Example 1, but the recess is made of stainless steel, and a satellite-shaped (shower hole-shaped) gas ejection hole of about 0.3 mm is arranged in the center. 0.04 liter / minute of nitrogen gas was sprayed from the hole, and the mold body was heated to 310° C. with a heater. And, likewise, pure water was sprayed for 4 seconds after taking it out. By this forced cooling, the molding surface temperature was lowered by 52° C. immediately before casting. In the case of using such a molding die, pure water does not evaporate instantaneously as in Example 1. Therefore, after spraying the pure water, cover the suction machine from above the molding die, and perform suction to remove the remaining pure water. Through this operation, the molding surface of the molding die is in...

Embodiment 3

[0097] Only change the forced cooling method of embodiment 1, and shape 430mm in the same way 3 of pre-foam. First prepare a Ф11mm aluminum rod (length: 80mm) with the top spherical surface ground and processed into 7R, and form a Ф6mm waterway inside the rod. In this water channel, there is an inlet of cooling water at a position of 15 mm from the tip on the spherical surface processing side, and an outlet of cooling water at a position of 65 mm. Also, the spherically processed rod tip is formed in a size that closely fits the center radius (7R) of the recess of the molding die. The above-mentioned rod with water cooling device is installed on the table with cylinder which can move up and down, and is arranged on the figure 1 The take-out position index is directly above (20mm from the mold) the position of the forming mold after indexing and rotating by 60° (the casting position is on the left). In addition, cooling water was flowed inside the rod at a flow rate of 20 lit...

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Abstract

The present invention provides a method of making preparative bubble substance, by which we can prevent hot conglutination between glass and molding surface and adhesion of the glass volatile in the hot molding using circle molding mold, so we can keep producing stably. The present invention also provides a method to make optical component using preparative bubble substance produced by following the method above. In the method of making preparative bubble substance, the melting glass from muzzle should be molded into the mold and the gas from molding surface can let the melting glass floatingon the molding surface. At the same time, preparative bubble substance should be formed and then we can take out the preparative bubble substance, after which we mold new melting glass into the mold and repeat above working procedure by moving several molds circularly, after taking out the preparative bubble substance and before molding new melting glass, at least one part of molding surface should be forced to refrigerate.

Description

technical field [0001] The present invention relates to a method for producing a pre-foam for precision press molding and a method for producing an optical element by precision press-molding the pre-foam produced by the above method. Background technique [0002] A precision press molding method (optical element molding method) is known as a technique for mass-producing high-precision glass optical elements such as aspheric lenses with high productivity. In the precision compression molding method, a method is employed in which a molded body generally called a pre-foam is produced, and the pre-foam is heated to perform compression molding. [0003] As a method for producing such a pre-foam, there is known a method of forming a glass block from molten glass, cutting the glass block into a predetermined size, and grinding and grinding to make the surface smooth and form a predetermined weight (called is cold processing method); the molten glass block of the amount of a single...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B19/02C03B40/04C03B11/06C03B11/08C03B11/12
CPCC03B40/04C03B2215/63C03B7/12C03B11/08C03B11/02
Inventor 上崎敦司吉田昌弘宇津木克己
Owner HOYA CORP