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The composition and classification of optical glass

2017/4/27      view:

              1 ingredients


              Optical glass is made of high purity silicon, boron, sodium, potassium, zinc, lead, magnesium, calcium, barium and other oxides by a specific formula mixed in the platinum crucible in high temperature melting, with ultrasonic stirring evenly, to the bubble; and then the long time to slow down, so as to avoid the glass block. After cooling of the glass block, it is necessary to measure the purity, transparency, uniformity, refractive index and dispersion rate by optical instrument. Glass block qualified after heating forging, optical lens blank.


               2 special type


                Rare earth element


                In the thirty 's, the new rare earth element optical glass, the main component of the lanthanum, thorium, tantalum oxide. Rare earth element optical glass has very high refractive index, which opens up new possibilities for the design of optical lens. Today, there are more than a large aperture lens. Thorium glass because of radioactive, has stopped production.


                Lead free light

                Lead free optical glass is not lead, arsenic, N logo.


                3 Classification

                The chemical composition and optical properties similar to the glass, in Abeitu also distributed in the adjacent position. Schott Aberto glass factory has a set of straight lines and curves, Aberto will be divided into many areas, the optical glass classification.


                4 physical parameters


              VD Abbe number a valid digital nd refraction rate seven effective digital ve four effective digital ne seven effective digital glass density. Four digits glass transparency. Four digits refraction rate with the change of the temperature coefficient of three significant figures.


                 5 glass


                International glass code with nine digits, the form is: xxxxxx.xxx; the first three digits representing the refractive index of the first three digits of the nd. The next three digits represent the Abbe number Vd first three digits, excluding the decimal point. Three digits after the decimal point represents the density of glass, such as the number of decimal places such as K10 glass nd=1.50137 after the first three digits of the =501Vd=56.41 head three digits, [1] regardless of the number of points =564 density =2.52; the international glass is not negligible decimal point =252K10 is 501564.252.