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Optical glass

An optical glass and glass technology, applied in the field of lanthanum crown glass, can solve problems such as reducing glass density, and achieve the effect of improving glass chemical stability, excellent mechanical properties and chemical stability

Inactive Publication Date: 2018-09-28
CDGM OPTICAL GLASS
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The introduction of alkaline earth metals such as BaO can improve the chemical stability of the glass, but the introduction of a large amount of BaO is not good for reducing the glass density

Method used

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Embodiment Construction

[0033] Ⅰ. Optical glass

[0034] The composition of the optical glass of the present invention will be described in detail below. The content and total content of each glass component are expressed in % by weight unless otherwise specified, and the ratio of the content of the glass component to the total content is expressed in weight ratio.

[0035] B 2 o 3 It is a glass network generator, especially in the lanthanide glass with high refraction and low dispersion, B 2 o 3 It is a necessary ingredient to obtain a stable glass. When B 2 o 3 When the content is less than 15%, the crystallization stability of the glass is not ideal; but when B 2 o 3 When the content is higher than 50%, the chemical stability of the glass will decrease. Therefore, B 2 o 3 The content is limited to 15-50%, preferably 16-48%, more preferably 17-45%.

[0036] SiO 2 It is also a glass network generator and the skeleton of optical glass, which can improve the chemical stability of glass and...

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Abstract

The present invention provides a lanthanum crown optical glass with good chemical stability. The refractive index of the glass ranges from 1.65 to 1.73 and the abbe number of the glass ranges from 50to 60. The optical glass comprises the following components in percentage by weight: 15-50% of B2O3, 2-20% of SiO2, 10-35% of La2O3, 0-10% of Y2O3, 12-25% of CaO, 0-15% of ZnO, 0-10% of ZrO2, and 0-20% of BaO. According to the present invention, a content ratio of network formers SiO2 and B2O3 is repeatedly optimized through continual trials, and an appropriate proportion of components such as ZnOand ZrO2 is introduced to improve the chemical stability of the glass. With full use of the differences in function between various alkaline earth metal oxides, the optical glass with excellent mechanical properties and chemical stability is finally obtained by reasonably selecting the types of the alkaline earth metal oxides introduced and the use ratios thereof.

Description

technical field [0001] The invention relates to an optical glass, in particular to lanthanum crown glass with a refractive index of 1.65-1.73 and an Abbe number of 50-60. Background technique [0002] With the development of the optoelectronic industry, the requirements for miniaturization, light weight and high performance of optical components are put forward, which makes the demand for optical glass with high refraction, low dispersion and low density is increasing. In the current patent literature, most of these glasses use borate glass system as the basis, and then add a certain amount of rare earth oxides, alkaline earth metal oxides and alkali metal oxides. B in glass system 2 o 3 When the content is large, the chemical stability is often not good. After the optical components are polished, the optical parts need to be cleaned before coating. The current mainstream cleaning method is to use ultrasonic cleaning. After cleaning, the water on the surface of the parts ...

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Application Information

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IPC IPC(8): C03C3/068
CPCC03C3/068
Inventor 郝良振毛露路匡波
Owner CDGM OPTICAL GLASS