Fluorophosphate optical glass

An optical glass, fluorophosphate technology, applied in optics, optical components, instruments, etc., can solve the problems of chemical stability, insufficient thermal stability, processing performance, easy to produce crystallization and stripes, poor thermal stability of glass, etc. To achieve good chemical stability, excellent thermal stability, excellent special dispersion effect

CN105016619AActive Publication Date: 2015-11-04CDGM OPTICAL GLASS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2015-11-04

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Abstract

An optical glass, having a refractive index nd which is greater than 1.59, an abbe number υd which is greater than 67, a low photoelastic coefficient and good chemical stability and grinding performance. The fluorophosphate optical glass contains, by cation percentage contents: P5+: 30％-40％, Al3+: 12％-20％, Ba2+: 30％-40％, Ca2+: 1.3％-12％, Sr2+: 1％-10％, La3+: 0％-5％, Gd3+: 0％-6％, Y3+: 0％-10％ and contains, by anion percentage contents: F+: 25%-40％, O2-: 60%-75％. The optical glass is applicable to manufacturing methods such as precision moulding, secondary hot-press forming and cold processing, and to manufacturing optical elements such as a high-performance spherical, aspheric and planar lens and a prism and an optical grating.
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Description

technical field

[0001] The invention relates to a fluorophosphate optical glass, in particular to a fluorophosphate optical glass with relatively high refractive index, low dispersion, low photoelastic coefficient, good chemical stability and processing performance. Background technique

[0002] Fluorophosphate optical glass is suitable as a lens material for eliminating high-order chromatic aberration in optical design due to its low dispersion and special dispersion. In fluorophosphate optical glass, low dispersion is usually accompanied by low refractive index, which is not suitable for making large diopter lenses. The existing low-dispersion fluorophosphate optical glass with a relatively high refractive index (nd>1.59) often has problems such as insufficient chemical stability, thermal stability and processing performance.

[0003] Japanese Patent Laid-Open No. 2-124740 discloses a low-dispersion high-refractive index fluorophosphate optical glass, but this glass ha...

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Embodiment Construction

[0024] The role of each composition and the scope-limiting role of the present invention are explained below.

[0025] It should be noted that in this specification, each cationic component and the total content of cationic components are represented by "cation percentage", and each anion component and the total content of anion components are represented by "anion percentage". "Cation percentage" refers to the percentage of a certain cationic component in the total cationic content, and "anion percentage" refers to the percentage of a certain anionic component in the total anionic content. The aforementioned contents are molar contents.

[0026] P 5+ It is a composition constituting the glass network. When the content is less than 30%, the stability of the glass is poor, and when the content exceeds 40%, it is difficult to obtain the high refractive index required by the present invention. Considering from the required optical performance and chemical stability of the prese...