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Optical glass

A technology of optical glass and optical components, applied in the directions of optics, optical components, optical surface grinders, etc., can solve the problems of glass stability decline, devitrification, reduction, etc., and achieve the effect of excellent glass stability and high refractive index

Active Publication Date: 2016-04-27
HOYA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the high refractive index and low dispersion glass has a relatively large amount of high refractive index imparting components and a relatively small amount of glass network forming components, so there are problems such as decreased glass stability and easy devitrification during the manufacturing process.

Method used

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  • Optical glass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0168] First, in order to obtain oxide glasses Nos. 1 to 36 having the compositions shown in Table 1-1 to Table 1-4 (indicated by cation %), nitrates, sulfates, hydroxides, oxides, etc. were used as raw materials. material, boric acid, etc., weigh each raw material powder, and mix them well to form a blended raw material. Put the blended raw material into a platinum crucible, heat, melt, clarify, and stir at 1400°C to become a uniform melt. Glass. The molten glass was poured into a preheated mold, rapidly cooled, kept at a temperature near the glass transition temperature for two hours, and then gradually cooled to obtain optical glasses of oxide glass Nos. 1 to 36. Precipitation of crystals was not recognized in any of the glasses.

[0169] In addition, the anion components of oxide glasses No. 1 to 36 are all O 2－ . In addition, Table 2-1 to Table 2-3 are compositions represented by mass % of oxide glass Nos. 1 to 36, and Table 3-1 to Table 3-3 are compositions represente...

Embodiment 2）

[0206] Next, press-molding glass gobs made of the respective optical glasses of Example 1 were produced as follows.

[0207] First, in order to obtain each of the above-mentioned glasses, glass raw materials are prepared, put into a platinum crucible, and heated, melted, clarified, and stirred to obtain a uniform molten glass. Next, the molten glass flows out from the outflow duct at a constant flow rate, and is cast into a mold arranged horizontally below the outflow duct to form a glass plate having a constant thickness. The formed glass plate is continuously pulled out horizontally from the opening provided on the side of the mold, transported by a belt conveyor to an annealing furnace, and slowly cooled.

[0208] The slowly cooled glass plate is cut or broken to produce glass sheets, and these glass sheets are tumbled to form glass blocks for press molding.

[0209]In addition, a cylindrical mold is arranged below the outflow duct, and molten glass is poured into the mold...

Embodiment 3）

[0211] Same as embodiment 2, the molten glass flows out from the outflow pipe, after the lower end of the molten glass flowing out is caught by the forming mold, the forming mold is lowered urgently, the flow of molten glass is cut off by surface tension, and the desired amount of molten glass is obtained on the forming mold piece. Then, the glass is molded into a gob while blowing gas from the molding die to float the glass by applying upward wind pressure, and the gob is taken out from the molding die and annealed. Then, the glass gob was tumble ground to become a glass gob for press molding.

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Abstract

An optical glass that is an oxide glass having a very high refractive index in spite of its low-dispersion property, having excellent glass stability and having less susceptibility to coloring.

Description

[0001] This application is a divisional application. The Chinese national application number of the original application is 200910151243.4, the filing date is June 29, 2009, and the invention name is "optical glass". technical field [0002] The present invention relates to an optical glass with high refractive index and low dispersion characteristics, a glass block for press molding formed of the optical glass, an optical element, a manufacturing method thereof, and a manufacturing method of an optical element blank. Background technique [0003] Combining a lens made of high-refractive-index low-dispersion glass with a lens made of ultra-low-dispersion glass enables correction of chromatic aberration and miniaturization of an optical system. Therefore, it occupies a very important position as an optical element constituting a projection optical system such as an imaging optical system or a projector. [0004] Patent Document 1 discloses such a high-refractive-index low-dis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C3/068C03C3/253C03C3/155G02B1/00B24B13/00
CPCC03C3/068C03C4/02
Inventor 根岸智明邹学禄
Owner HOYA CORP
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