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Manufacturing method of glass, optical glass, glass material for press molding, optical element, and their manufacturing method

A manufacturing method and optical glass technology, applied in optical components, glass manufacturing equipment, optics, etc., can solve the problems of heat-resistant material erosion, refractive index change, glass coloring, etc., to reduce erosion, suppress refractive index changes, The effect of reducing the amount of volatilization

Active Publication Date: 2011-12-07
HOYA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the clarification temperature is increased or the clarification time is prolonged, the amount of volatile components such as boric acid will decrease due to volatilization, resulting in a change in the refractive index, or heat-resistant materials such as platinum constituting the clarification tank will be corroded by molten glass, Melted into the glass to cause problems such as glass coloring

Method used

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  • Manufacturing method of glass, optical glass, glass material for press molding, optical element, and their manufacturing method
  • Manufacturing method of glass, optical glass, glass material for press molding, optical element, and their manufacturing method
  • Manufacturing method of glass, optical glass, glass material for press molding, optical element, and their manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0515] First, in order to obtain optical glasses with the compositions shown in Tables 1-1 to 1-3, Tables 2-1 to 2-10 and Tables 3-1 to 3-3, boric acid, oxides, carbonates, and sulfates Weigh and mix glass raw materials. As the carbonate, lanthanum carbonate, zinc carbonate, and barium carbonate were used, and as the sulfate, zinc sulfate, barium sulfate, and the like were used. In addition, it is preferable that no glass raw material is introduced into any of Sb, As, and nitrate.

[0516] Suppose the quality of the obtained optical glass is a, and the amount of carbon introduced into the glass raw material in the form of carbonate is converted to CO 2 At 0.2×10 -2 ×a~2×10 -2 ×a (0.2-2% by mass when expressed in other ratios) range, the amount of sulfur introduced into the glass raw material in the form of sulfate is converted into SO 3 At 0.07×10 -2 ×a~0.5×10 -2 ×a (0.07 to 0.5% by mass when expressed in other ratios), the number density of bubbles in the optical glass is contro...

Embodiment 2

[0678] Next, in order to obtain the glass of the composition shown in Table 4 and Tables 5-1 to 5-2, boric acid, oxides, carbonates, and sulfates were weighed, and glass raw materials were prepared. As the carbonate, lanthanum carbonate, zinc carbonate, and barium carbonate were used, and as the sulfate, zinc sulfate, barium sulfate, and the like were used. In addition, neither As nor nitrate was introduced into the glass raw material.

[0679] The amount of carbon contained in the glass material (external ratio) is converted to CO 2 , SO 3 The amount of is shown in Table 4 and Tables 5-1 to 5-2.

[0680] The prepared glass raw material is put into a platinum crucible, heated and stirred at 1100 to 1350°C while being melted, and the molten glass is poured into a casting mold for forming. Next, the formed glass is pulverized into granules to form a glass flake raw material.

[0681] In this way, for each optical glass, a glass flake raw material with a refractive index slightly lowe...

Embodiment 3

[0686] Various optical glasses were obtained by the method described in Example 1. The clarified and homogenized molten glass was prepared, flowed out of the tube at a fixed speed, and poured into a casting mold to form plate glass or round rod glass.

[0687] After annealing the obtained plate-shaped glass or round rod-shaped glass, it is cut and divided into glass pieces called slices, and a plurality of glass blocks are polished by a barrel.

[0688] Next, boron nitride, which is a powdered mold release agent, was uniformly coated on the entire surface of the glass block, heated in a heating furnace to soften it, and a compression molding mold consisting of an upper mold, a lower mold, and a body mold was used to It is formed into various lens blanks. The lens blank taken out from the press molding mold is annealed to reduce internal strain, and the refractive index is fine-tuned to make the refractive index of the glass consistent with the desired value.

[0689] The annealed le...

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Abstract

Disclosed is a method for producing a glass, wherein a molten glass is obtained by melting and refining a glass starting material and the molten glass is molded, thereby producing a glass molded body composed of an optical glass. The method for producing a glass is characterized by comprising preparation of a glass starting material so as to obtain an oxide glass which contains, in cationic percent, 12-65% of B3+, 0-20% of Si4+, 0-6% of Ge4+, 15-50% of La3+, Gd3+, Y3+, Yb3+, Sc3+ and Lu3+ in total, 4-54% of Ta5+, Zr4+, Ti4+, Nb5+, W6+ and Bi3+ in total, 0-35% of Zn2+, 0-9% of Li+, Na+ and K+ in total and 0-15% of Mg2+, Ca2+, Sr2+ and Ba2+ in total, with the sum of all cationic components being 99-100%. The method is also characterized in that the glass starting material contains a carbonate and a sulfate.

Description

Technical field [0001] The present invention relates to an optical glass with extremely high internal quality, a glass material for press molding and an optical element formed of the glass, and a manufacturing method thereof. Background technique [0002] It is well known that an optical glass having a boric acid-lanthanide series composition can be used as a high refractive index low dispersion glass or a high refractive index medium dispersion glass. As such optical glass, the type disclosed in Patent Documents 1 and 2 is known. [0003] Patent Document 1: Japanese Patent Publication No. 2002-284542; [0004] Patent Document 2: Japanese Patent Document Unexamined Publication No. 2001-348244. Summary of the invention [0005] However, it is difficult to obtain a sufficient defoaming effect if the refining temperature is not increased or the refining time is prolonged compared to all optical glasses in boric acid-lanthanide-based glasses with high refractive index and low dispersibi...

Claims

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Application Information

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IPC IPC(8): C03C3/068C03B1/00C03C3/15C03C3/155C03C3/253G02B1/00
CPCC03B5/1675C03C3/068C03C3/155C03C1/004Y02P40/57
Inventor 根岸智明藤原康裕
Owner HOYA CORP
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