Optical glasses of the dense barium flint position

A kind of optical glass and glass technology, applied in the field of optical glass, can solve the problems of inability to obtain optical position, small ZrO2 content, harmful crystallization stability, etc.

Active Publication Date: 2013-01-23
SCHOTT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0019] For similar reasons, the glasses disclosed in JP 77-069915A show corresponding disadvantages: due to ZrO 2 The content is small, and the required optical position cannot be obtained, especially the high dispersion of vd≥32
The resulting structure in the material thus facilitates ion exchange but is detrimental to crystallization stability, which is undesirable

Method used

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  • Optical glasses of the dense barium flint position
  • Optical glasses of the dense barium flint position
  • Optical glasses of the dense barium flint position

Examples

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Embodiment

[0103] Tables 2 and 3 show 12 examples of preferred compositional ranges. The glasses described in these examples were prepared as follows:

[0104] The raw material of the oxide, preferably the corresponding carbonate, is weighed, and one or more clarifying agents such as e.g. Sb 2 o 3 and mix well. The batch was melted at 1250° C. in a discontinuously operating melting plant, subsequently refined (1350° C.) and homogenized. The glass can be cast at a casting temperature of about 900°C and processed into the desired shape. In high volume continuously operating melting plants, the temperature can be reduced by at least 100 K and the material can be processed in a near net shape hot molding process such as precision pressing.

[0105] Table 1

[0106] Melting examples, based on 100kg of glass:

[0107]

[0108] As in Example 1, the properties of the glass obtained are given in Table 2. Close to the measurements described therein, the glass exhibits excellent chemical ...

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Abstract

The optical glasses designated to be used in the areas of imaging, sensors, microscopy, medical technology, digital projection, photolithography, laser technology, wafer / chip technology as well as telecommunications, optical communications engineering and optics / illumination in the automotive sector with a refractive index nd of 1.60≰nd≰1.72 and / or an Abbe number vd of 32≰vd≰45 and with a Tg of 567° C. to 640° C., pronounced short flint character, good chemical resistance, excellent resistance to crystallization, good solarization stability and the following composition (in % by weight based on oxides): SiO2 30-45 B2O3  8-12 Na2O  8-15 CaO 0.1-7   ZnO 0 ≰ 5 ZrO2 10-20 Nb2O5 12-24 Ta2O5 0 ≰ 9 AgO  0 ≰ 5.

Description

technical field [0001] The present invention relates to optical glass, to the use of such optical glass, to optical elements or preforms of such optical elements, to methods of manufacturing said optical elements and to optical components made of such optical elements ( Optical part) or optical component (optical component) manufacturing method. Background technique [0002] The claimed optical Conventional optical glasses at the site (preferably the heavy barium flint site and the wider range of heavy flint, light flint and barium flint sites) typically contain lead oxide (PbO) to obtain the desired optical properties, namely a refractive index nd of 1.60 ≤nd≤1.72 and / or the Abbe number vd is 32≤vd≤45. Lead oxide is also commonly used to adjust the pronounced short flint character. This makes the glass poor in chemical resistance. In addition, this component, lead oxide, is hazardous to the environment. [0003] In addition usually use As 2 o 3 as a clarifying agent....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C3/066C03C3/064C03C3/089
CPCC03C3/064C03C3/097
Inventor 西尔克・沃尔夫乌特・韦尔费尔戈登・基斯尔
Owner SCHOTT AG
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