Optical glass
An optical glass and glass technology, applied in the field of precision molded optical glass, can solve the problems of reducing the production glass yield, low platinum element dissolution rate, increasing platinum loss, etc., to reduce platinum consumption, reduce production difficulty, and reduce production. The effect of energy consumption
Active Publication Date: 2018-10-30
CDGM OPTICAL GLASS
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Problems solved by technology
On the one hand, it will increase the loss of platinum; on the other hand, the dissolution rate of platinum in silicate glass is very low. During the low-temperature forming process, platinum in the glass solution is easy to precipitate, and platinum inclusions are generated in the glass, reducing the Yield rate of glass production
Method used
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Embodiment
[0046] In order to further understand the technical solution of the present invention, examples of the optical glass of the present invention will now be described. It should be noted that these examples do not limit the scope of the present invention.
[0047] The optical glass (embodiment 1-20) shown in table 1, 2 is by weighing according to the ratio of each embodiment shown in table 1, 2 and mixing common raw material (such as oxide, hydroxide, carbonic acid) for optical glass salt, nitrate, etc.), put the mixed raw materials in a platinum crucible, melt at 1300-1450 ° C for 2.5-4 hours, and after clarification, stirring and homogenization, a homogeneous product without bubbles and undissolved substances can be obtained. High-quality molten glass is formed by casting the molten glass in a mold and annealing it.
[0048] The composition, refractive index (nd), Abbe number (vd), transmittance within 400nm (τ400nm), transition temperature (Tg), expansion coefficient (α) in t...
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Abstract
The invention provides high-weather-resistance optical glass with the refractive index of 1.54-1.62 and the abbe number of 50-65. The high-temperature viscosity of the optical glass is low, and the optical glass is suitable for aspheric surface precision compression. The optical glass comprises, by mole, 50-64% of SiO2, 2-20% of B2O3, 6-20% of ZnO, 0.3-5% of ZrO2, 1-5% of Al2O3, 7-15% of CaO, 2-8% of Na2O and 0.5-5% of K2O. According to the optical glass, the content of all the components are reasonably matched, the weather resistance of the glass is good, in the smelting process, the highest temperature is no more than 1450 DEG C, the high-temperature viscosity is low, the production difficulty is low, the production efficiency is high, the production energy consumption is reduced, platinum consumption is reduced, and the transmittance of the glass is improved easily; the transition temperature of the glass is lower than 590 DEG C, and the optical glass is suitable for aspheric surface precision compression.
Description
technical field [0001] The invention relates to an optical glass, in particular to an optical glass with a refractive index of 1.54-1.62 and an Abbe number of 50-65, which has high weather resistance and high transmittance and is suitable for precision molding. Background technique [0002] From the perspective of optics, glasses with a refractive index of 1.54-1.62 and an Abbe number of 50-65 belong to the traditional barium crown glass, which is usually made of SiO 2 -B 2 o 3 -BaO-R 2 O component system constitutes, among them, R 2 O refers to an alkali metal oxide. [0003] Generally speaking, this type of optical glass has poor weather resistance, and glass with poor weather resistance has a relatively large negative impact on the processing and long-term use of glass components. After the optical parts are polished, the surface of the polished glass has a high affinity for water and strong hygroscopicity. If the weather resistance of the glass is not good, it is ea...
Claims
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IPC IPC(8): C03C3/093C03C3/095
Inventor 毛露路匡波
Owner CDGM OPTICAL GLASS