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Optical glass

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

Active Publication Date: 2013-07-24
HOYA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0167] First, in order to obtain oxide glasses Nos. 1 to 36 having the compositions shown in Tables 1-1 to 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.

[0168] 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 represented by ...

Embodiment 2

[0205] Next, press-molding glass gobs made of the respective optical glasses of Example 1 were produced as follows.

[0206] 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.

[0207] 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.

[0208]In addition, a cylindrical mold is arranged below the outflow duct, and molten glass is poured into the mold...

Embodiment 3

[0210] 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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PUM

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Abstract

The invention provides an optical glass having a very high refractive index in spite of its low-dispersion property, having excellent glass stability and having less susceptibility to coloring. An optical glass is an oxide glass and is characterized in that the optical glass comprises, by cationic %, 0 to 30% of Si<4>, 10 to 55% of B<3>, less than 5% of total of Li<>, Na<> and K<>, less than 5% of total of Mg<2>, Ca<2> and Sr<2>, 0 to 8% of Ba<2>, 0.1 to 15% of Zn<2>, 10 to 50% of La<3>, 0 to 20% of Gd<3>, 0 to 15% of Y<3>, 0 to 10% of Yb<3>, 0 to 20% of Zr<4>, 0.1 to 22% of Ti<4>, 0 to 20% of Nb<5>, 0 to 8% of Ta<5>, 0 to 5% of W<6>, 0 to 8% of Ge<4>, 0 to 10% of Bi<3>, and 0 to 10% of Ai<3>, the cationic ratio of the content of Si<4> to the content of B<3>, Si<4> / B<3>, being less than 1.0, the total content of Nb2O5 and Ta2O5 as oxides being less than 14 mass %, the optical glass having a refractive index nd of 1.92 to 2.2 and an Abbe's number nud of 25 to 45.

Description

technical field [0001] 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 [0002] 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. [0003] Patent Document 1 discloses such a high-refractive-index low-dispersion glass. [0004] Patent Document 1: Japanese Patent Application Laid-Open No. Sho 55-60039. Contents of the invention [0005] However, high-refractive-index-low-dispersion glasses have relatively large amoun...

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
CPCC03C3/068
Inventor 根岸智明邹学禄
Owner HOYA CORP
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