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Glass, glass material for pressing moulding,optical member blank and optical membe

A technology of optical components and glass, applied in optical components, optics, instruments, etc., to achieve excellent homogeneity and acid resistance

Active Publication Date: 2016-06-22
HOYA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] However, according to the research of the present inventors, in order to further improve the acid resistance while achieving excellent thermal stability and homogeneity, the prior art high refractive index and low dispersion fluorophosphate glass still needs further improvement

Method used

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  • Glass, glass material for pressing moulding,optical member blank and optical membe
  • Glass, glass material for pressing moulding,optical member blank and optical membe
  • Glass, glass material for pressing moulding,optical member blank and optical membe

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Embodiment

[0120] Hereinafter, the present invention will be further described based on examples. However, this invention is not limited to the form shown to an Example.

[0121] 1. Production and evaluation of glass No.1 to No.30

[0122] In such a way that the glass with the composition shown in Table 1 can be obtained, weigh 100 to 300 g of glass raw materials such as phosphates, fluorides, and oxides corresponding to each glass component in a prescribed ratio, and mix them well to prepare a batch material. The preparation batch is put into a platinum crucible and covered with a lid, and melted in air or nitrogen environment for 1 to 3 hours at 850 to 1200° C. while stirring. After melting, pour the molten glass into a carbon mold of 40×70×15mm, put it into the annealing furnace immediately after cooling to the glass transition temperature, and perform annealing in the glass transition temperature range for about 1 hour. Each glass which has the composition of No.1-No.30 was obtain...

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Abstract

The present invention provides a thermal stability, homogeneity and acid resistance of excellent high refractive index low dispersion fluoride phosphate glass. A glass, which, as a cation composition contains at least P5 +, Al3 +, Ba2 + and R2 + R2 + is described from magnesium 2 +, Ca2 + and Sr2 + and Zn2 + more than one, as anion composition containing O2 - and F - at least, in the cation composition proportion, relative to the content of Al3 + Al3 + and the molar ratio of the total content of P5 + Al3 + / (Al3 + + P5 +) in the range of 0.56 ~ 0.56, relative to the content of Al3 + Ba2 + and the molar ratio of the total content of R2 + Al3 + / +) (Ba2 + + R2 more than 0.58, the total content of Ba2 + and Sr2 + relative to Ba2 + and the molar ratio of the total content of R2 + (Ba2 + + Sr2 +) / (Ba2 + + + R2) of 0.60 above, Li +, Na + and K + relative to the total content of Al3 + and the molar ratio of the total content of P5 + (Li++ Na++ K +) / (P5 + + Al3 +) less than 0.39, the range of the refractive index nd for more than 1.47 and 1.53 below, and the abbe number argument d range is 80 ~ 95.

Description

technical field [0001] The invention relates to a glass, a glass material for press molding, an optical element blank and an optical element. Background technique [0002] Glasses containing phosphorus and fluorine (fluorophosphate-based glasses) are known as high-refractive-index low-dispersion glasses (see Patent Documents 1 to 4). [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-Open No. 2012-153602; [0006] Patent Document 2: Japanese Patent Laying-Open No. 2-149445; [0007] Patent Document 3: Japanese Patent Laying-Open No. 5-208842; [0008] Patent Document 4: Japanese Patent Application Laid-Open No. 7-157330. [0009] High-refractive-index low-dispersion glass is in high demand as an optical element material for various lenses and the like. This is because, for example, a high-refractive-index low-dispersion lens can be combined with a high-refractive-index high-dispersion lens to form a compact and high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/247G02B1/00
Inventor 盐田勇树根岸智明
Owner HOYA CORP
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